Abstract:
To present technology of discharge and local ventilation capable of decreasing ventilation capacity and air conditioning capacity substantially by lowering the air conditioning load by introduction of fresh air by intake, and decreasing the capacity of air conditioning and ventilation facilities by eliminating consumption of electrical energy.  
     This a method of discharging polluted air near combustion heating type cooking device ( 1 ) in a room having combustion heating type cooking device ( 1 ) to cause polluted air, comprising the steps of generating upward suction discharge stream ( 6 ) from upward position of the combustion heating type cooking device ( 1 ) to outdoor air, generating upward blow induction stream ( 21 ) from the position near the side of the combustion heating type cooking device ( 1 ) to the suction discharge stream ( 6 ), and by inductive action of this blow induction stream ( 21 ), taking up the polluted area near the surrounding of the combustion heating type cooking device ( 1 ) and forcibly collecting and delivering into the suction discharge stream ( 6 ).

Description:
TECHNICAL FIELD  
       [0001]     The present invention relates to discharge method, local ventilation method, discharger, local ventilator, and ventilation system, and more particularly to an effective technology of discharge and local ventilation for use in any indoor space requiring discharge and ventilation such as factory, kitchen, smoking room, and toilet, where sources of contaminants causing polluted air can be specified in a specific area in the room, and polluted air is not seriously harmful for human health such as hot air flow, steam, odor, cigarette smoke, oil fume or dusty air.  
       BACKGROUND ART  
       [0002]     Generally in indoor space having sources of contaminants causing polluted air such as factory, kitchen, smoking room, and toilet, discharge or ventilation for cleaning the indoor atmosphere is needed.  
         [0003]     In this case, if the polluted air is not seriously harmful for human health such as hot air flow, steam, odor, cigarette smoke, oil fume or dusty air, local ventilation method for such indoor space is generally an overall ventilation method for exchanging the entire air of the room, in a diluted state of polluted air mixed in the indoor atmosphere.  
         [0004]     Overall ventilation method consists of three types, that is, a case of using mechanical power in both intake and discharge, a case of using mechanical power in intake and discharging naturally through suction opening, and a case of using mechanical power in discharge, and sucking naturally from intake opening, and the mainstream is the mechanical intake and discharge method.  
         [0005]     According to statutory regulations about ventilation in general buildings, ventilation rates are roughly determined for the purposes of assuring safety and sanitation of people as calculated from the allowable carbon dioxide concentration in the room, or keeping necessary amount of oxygen for combustion in a room using fire or flame, and standards based on pure technology or performance are not clear. In the present building technical field or industries, it has been a general trend not to spend too much money in ventilation system as far as the statutory requirements about ventilation are satisfied.  
         [0006]     On the other hand, a general ventilation system in a room demanding a certain habitability and working efficiency, for example, a professional kitchen ventilation system is composed, for example, in an overall ventilation system, as shown in  FIG. 19 , in which a combustion heating cooking device (a) as source of contaminant is disposed closely to the wall of the room, and the entire air of the kitchen is ventilated.  
         [0007]     That is, in the ceiling above the cooking device (a), a suction opening (c) is opened for a discharge duct (b), and discharge fan for duct (not shown) is provided at the outdoor side end of the discharge duct (b). The suction opening (c) is covered with a discharge hood (e) for capturing polluted air containing hot jet flow (d) of contaminants generated by combustion and heating of the cooking device (a), and diffusion of polluted air is prevented. On the other hand, in the ceiling of the central part of the room away from the cooking device (a), a discharge opening (h) of intake dust (g) having intake box (f) is opened, and an air conditioner (i) is installed. In the ceiling near an opening (m) remote from the cooking device (a), a discharge duct (k) having a ceiling discharge fan (j) is opened.  
         [0008]     The hot jet flow (d) of contaminants generated by combustion and heating of the cooking device (a) is captured into the discharge duct (b) from the discharge hood (e) and suction opening (c) by driving of dust discharge fan of the discharge duct (b), and is discharged out of the room, and the indoor air at a position remote from the cooking device (a) is discharged out of the room (not shown) through discharge duct (k) opened near the opening (m). On the other hand, from the intake opening (h) in the center of the ceiling, by driving of dust intake fan (not shown), fresh outdoor air is supplied through intake box (f) of intake duct (g), and also fresh air flows in from the window (m) of the kitchen. As a result, the entire air in the kitchen is ventilated.  
         [0009]     However, such conventional overall ventilation method has the following problems, and it has been desired to solve them.  
         [0010]     As represented by kitchen, when the overall ventilation system is installed in a room having many sources of contaminants, the ventilation rate is enormous and discharge efficiency is poor in ventilation, and since a huge volume of fresh air is introduced as intake, the indoor air becomes same as outdoor air.  
         [0011]     Discharge by suction and discharge stream by using mechanical power is poor in controllability, and only the contaminants cannot be discharged effectively, and heat, steam, oil fuse, odor or vapor may be stagnant in the room, and the indoor air conditioning state is poor.  
         [0012]     For example, in the case of kitchen, to satisfy the temperature and humidity condition of the kitchen as the standard of hazard analysis and critical control point (HACCP), a tremendous amount is required in ventilation air flow and air conditioning capacity.  
         [0013]     Increase of ventilation air flow and air conditioning capacity leads to increase of ventilation and air conditioning equipment capacity, and also increase in initial cost and running cost of ventilation and air conditioning equipment.  
         [0014]     In addition, increase of ventilation and air conditioning equipment capacity also leads to increase of electric capacity of equipment, and such increase of energy consumption also causes to increase outputs of global warming gases such as CO and CO 2 .  
         [0015]     Concerning this point, the following ventilation system of special application may be used in ventilation system in a room requiring specific habitability and working efficiency as ventilation system of kitchen.  
         [0016]     That is, in factory ventilation, since substances harmful for human health are released, statutory standards are strict, and sources of harmful contaminants are enclosed by partitions, and the operator puts hands into the partitions, and the partial or local ventilation system by draft chamber is widely employed as effective means.  
         [0017]     If the draft chamber cannot be used depending on the kind of work, the so-called push-pull flow method is executed as effective local ventilation system. In local ventilation system by push-pull flow method, sources of contaminants are enclosed by uniform flow of blowing (push) flow and sucking (pull) flow, and air balance is completed locally.  
         [0018]     Overall ventilation system for ventilating a wide space such as indoor parking facility includes so-called delivent ventilation system making use of induction action. In this delivent ventilation system, corresponding to suction discharge, indoor polluted air is guided and delivered to the suction opening by plural small blowers arranged sequentially, and by this method of ventilation, the duct extension distance can be shortened, and efficient ventilation is realized.  
         [0019]     However, even in such local ventilation system or overall ventilation system effective in special applications, when employed as ventilation system of a room requiring a certain habitability or working efficiency, there are new problems as listed below, it is far from the level of actual execution.  
         [0020]     That is, in the local ventilation method by draft chamber, since the sources of contaminants are enclosed by partitions, there is no risk of leak of polluted air into the room, but materials cannot be delivered onto the working surface through the door, the working efficiency is extremely poor.  
         [0021]     In the local ventilation method by push-pull flow type, contaminant sources are enclosed, and the air flow rate of induction stream and suction discharge stream is balanced in the entire surrounding space, and hence when the bore of the blow opening and the core of suction opening become large, the air flow rate increases tremendously. From the viewpoint of working efficiency, the worker gets into the uniform air flow, and in the case of kitchen, a lower blow opening is provided, different from the upper suction opening, and not only the working efficiency is lowered, but there is also problem of sanitation.  
         [0022]     The ventilation method by delivent ventilation system is overall ventilation method, not local ventilation, and assuming automotive emission to be collected in the ceiling of indoor parking facility, it is intended to guide in the discharge direction, and the discharge efficiency is enhanced, but the air flow rate is not decreased. Besides, since many small delivent fans are installed in the ceiling, the noise is very large.  
         [0023]     In this regard, the present applicant has previously developed and proposed a local ventilation system as disclosed in Japanese Patent Publication No. 2001-355889. This local ventilation system, as shown in  FIG. 20 , mainly comprises a discharge device (p) composed of suction discharge stream generator (q) and blow induction flow generator (r).  
         [0024]     The suction discharge stream generator (q) has a suction opening (t) in the ceiling above contaminant source (s) such as cooking device, and is designed to cause an upward suction discharge stream (v) consecutive to outdoor air by discharge fan (u). On the other hand, the induction flow generator (r) has a blow opening (w) at position near the side of the contaminant source (s), and is designed to generate upward blow induction stream (y) by blow fan (x). The blow opening (w) is provided at a position not interfering with the working range of the worker M.  
         [0025]     By driving of discharge fan (u), upward suction discharge stream (v) consecutive from suction opening (t) at the upward position of contaminant source (s) to outdoor air is generated, and by driving of blow fan (x), upward blow induction stream (y) is generated from the blow opening (w) of the blow nozzle near the side of the contaminant source (s), and by the induction action of this blow induction stream (y), the polluted area near the surrounding of contaminant source (s) is collected and distributed by force into the suction exhaust flow (v).  
         [0026]     By this local ventilation system, ventilation can be completed locally without sacrificing the habitability and working efficiency.  
         [0027]     The invention is intended to improve further this local ventilation system, and to present a new technology of discharge and local ventilation capable of decreasing the ventilation rate and air conditioning capacity substantially, and eliminating consumption of electric energy and decreasing the device capacity, by decreasing the air conditioning load by introduction of fresh air by air intake.  
         [0028]     It is other object of the invention to present technology of discharge ad local ventilation having an allowance in existing power source capacity and air conditioning capacity, and capable of effectively utilizing the existing ducts and other installations, by decreasing the ventilation rate and air conditioning capacity substantially.  
       DISCLOSURE OF THE INVENTION  
       [0029]     To achieve these objects, the discharge method of the invention is a discharge method of discharging polluted air around and near a contaminant source in a room having the contaminant source to cause polluted air, comprising the steps of generating upward suction discharge stream from upward position of the contaminant source to outdoor air, generating upward blow induction stream from the position near the side of the contaminant source to the upward suction discharge stream, and by induction action of the blow induction stream, taking up the polluted area near the surrounding of the contaminant source and collecting and delivering by force into the upward suction discharge stream.  
         [0030]     In a preferred embodiment, the blow induction stream is set so as to blow outward the suction opening inside of the suction discharge stream, and the suction opening is disposed and formed so as to overlap almost entirely with the contaminant source in a plan view. The blow induction stream is formed by indoor air or outdoor air.  
         [0031]     A first local ventilation method of the invention is a method of locally ventilating a room having a contaminant source to cause polluted air, being characterized by applying the above discharge method on the contaminant source, and supplying a specified amount of intake air from a proper position, and thereby establishing balance of room air and local air simultaneously.  
         [0032]     A second local ventilation method of the invention is a method of locally ventilating a room having a contaminant source to cause polluted air, being characterized by applying the above discharge method on the contaminant source, generating downward blow intake stream from the surrounding position of suction discharge opening, and pushing back the polluted air leaking out of the discharge region of suction opening by force into the suction opening again by the air curtain action of the blow intake stream.  
         [0033]     In both local ventilation methods, preferably, the air flow rate of the suction discharge stream can be set depending on the sum value of the air flow rate of blow induction stream, polluted air flow around the contaminant source guided by this blow induction stream, and air flow amount, thereby establishing balance of room air and local air simultaneously.  
         [0034]     The discharger of the invention is intended to execute the discharge method above, comprising suction discharge stream generating means for generating an upward suction discharge stream consecutive to outdoor room, having a suction opening opened in an upward position of the contaminant source, and blow induction stream generating means for generating an upward blow induction stream, having a blow opening provided near the side of the contaminant source, in which the blow induction stream generating means is set to blow out the blow induction stream from the blow opening to the inside of suction opening, and by the induction action of the blow induction stream by the blow induction stream generating means, the polluted air around the contaminant source is taken up, and collected and delivered by force to the suction discharge stream.  
         [0035]     In a preferred embodiment, the discharge duct of suction discharge stream generating means has its end opened to outdoor side, and its base end communicates with a discharge box formed as a box container, and the suction opening is opened oppositely to this discharge box in the room. In this case, in the discharge box, preferably, the axial direction of the connection opening connected to the base end of the discharge duct should intersect in the axial direction of the suction opening. Air source of blow induction stream generating means is either indoor air or outdoor air.  
         [0036]     The suction opining is disposed and formed so as to overlap almost entirely with the contaminant source in a plan view.  
         [0037]     On the outer circumference of the suction opening, a discharge hood is provided for preventing diffusion of blow induction stream from the blow induction stream generating means and taken-up stream of polluted air guided by this induction stream, and the inner peripheral wall of the discharge hood is preferred to be a sloped wall climbing upward to the suction opening.  
         [0038]     A first local ventilator of the invention is a device of locally ventilating around a contaminant source in a room having a contaminant source to cause polluted air, is being characterized by installing the discharger on the contaminant source, and supplying a specified amount of intake air from a proper position, and thereby establishing balance of room air and local air simultaneously.  
         [0039]     A second local ventilator of the invention is a device of locally ventilating around a contaminant source in a room having a contaminant source to cause polluted air, being characterized by installing the discharger on the contaminant source, having intake means for generating downward blow intake stream from the surrounding position of suction discharge opening, and pushing back the polluted air leaking out of the discharge region of suction opening by force into the suction opening again by the air curtain action of the blow intake stream of the intake means.  
         [0040]     In both local ventilators, preferably, the suction air flow rate of the suction discharge stream generating means is set depending on the sum value of the blow air flow rate of blow induction stream generating means, blow air flow rate of the intake means, and polluted air flow rate around the contaminant source guided by the blow induction stream of the blow induction stream generating means, thereby establishing balance of room air and local air simultaneously.  
         [0041]     Preferably, it further comprises intake means for generating downward blow intake stream from around the suction opening of the discharge stream generating means, and by the air curtain action of the blow intake stream of this intake means, polluted air leaking to outside of the suction opening is pushed back by force into the suction opening again. In this case, the blow opening of the intake means is preferably provided integrally on the outer circumference of the discharge hood provided on the outer circumference of the suction opening, and further the blow opening of the intake means is provided at a position of ceiling level on which the discharge hood is mounted.  
         [0042]     Preferably, the suction air flow rate of the suction exhaust stream generating means is set depending on the sum value of the blow air flow rate of blow induction stream generating means, blow air flow rate of the intake means, and polluted air flow rate around the contaminant source guided by the blow induction stream of the blow induction stream generating means, thereby establishing balance of room air and local air simultaneously.  
         [0043]     The ventilation system of the invention is composed by installing the local discharger on the contamination source, in a room having a contaminant source to cause polluted air, and establishing the balance of indoor air and local air simultaneously. In this case, it further comprises supplement ventilation means for compensating for ventilation rate in the room, and it is driven manually or automatically by carbon dioxide sensor or the like when becoming lower than a specified ventilation rate, thereby establishing the balance of indoor air and local air simultaneously.  
         [0044]     In the invention, by the suction discharge stream and blow induction stream, an upward uniform stream of high controllability is formed to pass near the surrounding of contamination source to cause polluted air, and by the induction action of blow induction stream, the polluted air around the contaminant source is collected and delivered by force into the suction discharge stream. In other words, the stream of air from around the contaminant source toward the suction opening of the suction discharge steam is created by force in the room, and this stream of air takes up the polluted air, and brings out to the suction opening of the suction discharge stream.  
         [0045]     Thus, the upward uniform stream for discharging the polluted by force is discharged without enveloping the contaminant source by passing around and near the contaminant source, there is almost no interference with the workers and working operation, and habitability and working efficiency are not spoiled.  
         [0046]     By completing ventilation locally by discharge, the ventilation rate and air conditioning capacity can be saved, and by keeping low the capacity of ventilation and air conditioning equipment, the initial cost and running costs of the ventilation and air conditioning equipment can be saved, and by reduction of consumption of electric energy, generation of global warming gases can be cut low.  
         [0047]     As a result of substantial reduction of ventilation rate and air conditioning capacity, a sufficient allowance is made in the existing power source capacity and air conditioning capacity, and the existing ducts and other ventilation facilities can be directly used effectively.  
         [0048]     The leading ends of ventilation ducts of suction discharge stream generating means are opened to outdoor side, and the base end communicates with the discharge box formed as a box container, and suction opening of the suction discharge stream is opened against this discharge box in the room, so that the suction opening may be disposed freely within the discharge surface side range of the discharge box, and the degree of freedom of layout is increased in the contamination source, such as cooking apparatus, and the existing ducts can be directly used effectively. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0049]      FIG. 1  is a front view of local ventilator in embodiment 1 of the invention.  
         [0050]      FIG. 2  is a plan view of the local ventilator.  
         [0051]      FIG. 3  is a sectional view along line A-A or line B-B in  FIG. 2  showing the local ventilator.  
         [0052]      FIG. 4  is a sectional view along line C-C in  FIG. 2  showing the local ventilator.  
         [0053]      FIG. 5  is a plan view of suction discharge stream generating unit and intake device of the local ventilator.  
         [0054]      FIG. 6  is a plan view of configuration of blow induction stream generating unit of the local ventilator showing in relation to combustion heating type cooking apparatus.  
         [0055]      FIG. 7  is a front view of local ventilator in embodiment 2 of the invention.  
         [0056]      FIG. 8  is a front view of local ventilator in embodiment 3 of the invention.  
         [0057]      FIG. 9  is a front view of local ventilator in embodiment 4 of the invention.  
         [0058]      FIG. 10  is a side view of local ventilator in embodiment 5 of the invention.  
         [0059]      FIG. 11  shows discharge stream generating unit and intake device of the local ventilator,  FIG. 11A  is a plan view,  FIG. 11B  is a front view, and  FIG. 11C  is a bottom view.  
         [0060]      FIG. 12  shows blow induction stream generating unit of the local ventilator,  FIG. 12A  is a plan view, and  FIG. 12B  is a front view.  
         [0061]      FIG. 13  shows blow induction stream generating unit of local ventilator in embodiment 6 of the invention,  FIG. 13A  is a plan view,  FIG. 13B  is a front view, and  FIG. 13C  is a side view.  
         [0062]      FIG. 14  shows blow induction stream generating unit of local ventilator in embodiment 7 of the invention,  FIG. 14A  is a plan view,  FIG. 14B  is a front view, and  FIG. 14C  is a side view.  
         [0063]      FIG. 15  shows blow induction stream generating unit of local ventilator in embodiment 8 of the invention,  FIG. 15A  is a plan view,  FIG. 15B  is a front view, and  FIG. 15C  is a side view.  
         [0064]      FIG. 16  is a plan view of smoking room having local ventilator in embodiment 9 of the invention installed as smoke separator.  
         [0065]      FIG. 17  is a front view from arrow direction of line A-A in  FIG. 16  showing the structure of the smoking room.  
         [0066]      FIG. 18  is a side view from arrow direction of line B-B in  FIG. 16  showing the structure of the smoking room.  
         [0067]      FIG. 19  is a front view of local ventilator in embodiment 10 of the invention.  
         [0068]      FIG. 20  is a sectional view corresponding to  FIG. 3  showing the local ventilator.  
         [0069]      FIG. 21  is a sectional view corresponding to  FIG. 4  showing the local ventilator.  
         [0070]      FIG. 22  is a block diagram of ventilation system in a conventional kitchen.  
         [0071]      FIG. 23  is a block diagram of local ventilator in other conventional kitchen.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0072]     Referring now to the drawings, preferred embodiments of the invention are described below.  
       Embodiment 1  
       [0073]     A local ventilator of the invention is shown in  FIG. 1  and  FIG. 2 . The local ventilator PV is an apparatus for ventilating locally around the contaminant source in a room having a contaminant source to cause polluted air, and specifically it is for a professional kitchen use in a school, hospital or relatively large building in a room depending specific habitability and working efficiency.  
         [0074]     The local ventilator PV has a discharger E for combustion heating type cooking device  1  such as table cooking range as source of contaminant, and intake device (intake means) S is integrally provided in the discharger E.  
         [0075]     The discharger E mainly consists of suction discharge stream generator (suction discharge stream generating means)  2 , and blow induction stream generator (blow induction stream generating means)  3 .  
         [0076]     The suction discharge stream generator  2  has a suction opening  5  provided above the cooking device  1 , and is designed to generate an upward suction discharge stream  6  consecutive to the outdoor side. This suction discharge stream  6  mainly function as a stream of discharging by sucking the polluted air of the contaminant released from the cooking device  1 .  
         [0077]     The suction discharge stream generator  2  is specifically provided in the ceiling above the cooking device  1 , and a leading end  10   a  of a discharge duct  10  is opened to outdoor side, and its base end  10   b  communicates with a discharge box  11 , and the suction opening  5  is opened in the discharge box  11  oppositely in the room. A discharge fan  12  as discharge stream generating source is provided at the leading end  10   a  of the discharge duct  10 .  
         [0078]     The discharge box  11  is intended to have a degree of freedom of opening of the suction opening  5  at the indoor side opening of the discharge duct  10 , and it is formed like a box container.  
         [0079]     In the discharge box of the preferred embodiment, as shown in  FIG. 2  and  FIG. 5 , three rectangular suction openings  5   a ,  5   b , and  5   c  are provided in the rectangular bottom. The suction openings  5   a ,  5   b ,  5   c  are, as shown in  FIG. 2 , disposed and formed so as to overlap almost entirely with the combustion heating type cooking device  1  in the room, and are installed so that the capturing area may be as wide as possible.  
         [0080]     Specifically, the first suction opening  5   a  is disposed at a position nearly above the first table cooking range  1   a  of the combustion heating type cooking device  1 , and is formed in a shape to cover the table cooking range  1   a  as much as possible. The second and third suction openings  5   b  and  5   c  are provided closely above the second to fourth table cooking ranges  1   b  to  1   d  of the combustion heating type cooking device  1 , and formed in a shape to cover the table cooking ranges  1   b  to  1   d  as much as possible.  
         [0081]     In the discharge box  11 , the axial direction of connection opening for connecting the base end  10   b  of the discharge duct  10 , that is, the duct connection direction X, and the axial direction of the suction opening  5 , that is, the suction opening discharge stream direction Y are arranged to intersect with each other, so that the air stream is dispersed.  
         [0082]     In the illustrated preferred embodiment, the discharge box  11  is rectangular parallelepiped, and two discharge ducts  10 ,  10  are connected to its one vertical side, the three suction openings  5   a  to  5   c  are opened in the horizontal bottom, and the intersecting angles of duct connection directions X, X and suction opening discharge stream directions Y, Y, . . . are right angles.  
         [0083]     Inside the discharge box  11 , grease remover (grease removing means)  13  is provided for separating and removing oily contents in the discharge. This grease remover  13  is specifically a grease filter, and is provided in the discharge box  11 , between the suction openings  5  ( 5   a  to  5   c ) and connection openings of discharge ducts  10 ,  10 . In such configuration, when the blow induction stream is blown out toward the suction openings  5  ( 5   a  to  5   c ), it is effectively prevented from colliding against the grease remover  13  to scatter about to become turbulent flow.  
         [0084]     In the indoor side outer circumference of the suction openings  5  ( 5   a  to  5   c ), a discharge hood  15  is provided. This discharge hood  15  is intended to supplement the structure and action of the blow induction stream generator  3 . That is, the discharge hood  15  prevents diffusion of blow induction stream from the blow induction stream generator  3 , and take-up flow of polluted air guided into the blow induction stream, and these discharge streams are securely captured and the discharge effect is enhanced.  
         [0085]     In the discharge hood  15  of the illustrated preferred embodiment, its inner peripheral wall  15   a  is formed in a sloped wall climbing up toward the suction openings  5  ( 5   a  to  5   c ). That is, as mentioned above, the capturing area of suction openings  5  ( 5   a  to  5   c ) is wide, but in order that the suction opening area should not be excessive, the inner peripheral wall  15   a  of the discharge hood  15  is formed as a sloped wall climbing up from the lower end to the suction openings  5  ( 5   a  to  5   c ), specifically to the bottom  11   a  of the discharge box  11 , so that bouncing of polluted air is suppressed.  
         [0086]     The blow induction stream generator  3  is intended to collect and deliver the polluted air around the combustion heating type cooking device  1  by force into the suction discharge stream  6 , and a blow opening  20  is provided near the side of the cooking device  1 , and an upward blow induction stream  21  is generated.  
         [0087]     Specifically, the blow induction stream  21  from the blow opening  20  is designed to blow out into the inside of the suction opening  5 , and the majority of the blow induction stream  21  is engulfed into the suction discharge stream  6 . In other words, the blow induction stream  21  is prevented from colliding against the periphery of the suction opening  5  to scatter about to form turbulent flow.  
         [0088]     The blow induction stream generator  3  of the illustrated preferred embodiment has three induction stream generating devices  22   a ,  22   b ,  22   c  corresponding to first to fourth table cooking ranges  1   a  to  1   d  of the combustion heating type cooking device  1  as shown in  FIG. 6 . The location of these induction stream generating devices  22   a ,  22   b ,  22   c  is arranged so as not to interfere with the working area of the workers (cooks, not shown), that is, the outer periphery of the combustion heating type cooking device  1  in  FIG. 6 .  
         [0089]     Specifically, the first induction stream generating device  22   a  is provided in contact with the back side of the first table cooking range  1   a  of the combustion heating type cooking device  1 , the second induction stream generating device  22   b  is provided between the second table cooking range  1   b  and fourth table cooking range  1   d , and the third induction stream generating device  22   c  is provided between the third table cooking range  1   c  and fourth table cooking range  1   d.    
         [0090]     These induction stream generating devices  22   a ,  22   b ,  22   c  are basically same in structure, and are installed in upright position on the casing of the combustion heating type cooking device  1 , that is, on the cooking table  25 .  
         [0091]     More specifically, the induction stream generating devices  22   a ,  22   b ,  22   c  are arranged as shown in  FIG. 1 ,  FIG. 3 , and  FIG. 4 , in which the top of the device main body  26  of hollow long box shape coincides with a blow nozzle  28  of the blow opening  20 , and blow fans  27 ,  27  as induction stream generating sources are provided in the lower part of the device main body  26  in horizontal position, and the air source is indoor air.  
         [0092]     An intermediate tubular portion  26   a  of the device main body  26  functions as straightening section for straightening the induction stream sent into the blow nozzle  28  from the blow fans  27 ,  27 .  
         [0093]     Each blow nozzle  28  is composed so that its axial line may be extended toward the inside of the suction openings  5  ( 5   a  to  5   c ) of the exhaust box  11 . That is, the blow nozzle  28  of the first induction stream generating device  22   a  has its axial line in inclined and upright position to pass through nearly the center of the first suction opening  5   a  as shown in  FIG. 4 , and the blow induction stream  21  is blown obliquely upward toward the inside of the suction opening  5   a  from the blow opening  20 , while the blow nozzles  28 ,  28  of the second and third induction stream generating devices  22   b ,  22   c  are have their axial lines in vertical and upright position to pass through nearly the center of the second and third suction openings  5   b ,  5   c  as shown in  FIG. 3 , and the blow induction stream  21  is blown upward vertically toward the inside of the suction openings  5   b ,  5   c  from the blow opening  20 .  
         [0094]     In the discharger E having such configuration, by driving of discharge fans  12 ,  12  of suction discharge stream generator  2 , upward suction discharge streams  6 ,  6 ,  6  consecutive to the suction openings  5  ( 5   a  to  5   c ) are generated, and by driving of blow fans  27 ,  27 , . . . of the blow induction stream generator  3 , upward blow induction streams  21 ,  21 ,  21  straightly extending to the suction openings  5  ( 5   a  to  5   c ) from the blow opening  20  of the blow nozzles  22  in the induction stream generators  22   a ,  22   b ,  22   c  are generated.  
         [0095]     As a result, the upward uniform stream by these streams  6 ,  21  (an always uniform stream, not changing from time to time, in the state of stream at a certain stream section) is formed to pass around the combustion heating type cooking device  1 , and by the attracting action of blow induction streams  21 ,  21 ,  21  by the blow induction stream generator  3 , the polluted air around the combustion heating cooking device  1  including the hot jet flow o contaminants generated from combustion heat of the combustion heating type cooking device  1  is collected and delivered by force into the suction discharge stream  6 .  
         [0096]     In other words, a stream of air from around the combustion heating type cooking device  1  toward the suction openings  5  ( 5   a  to  5   c ) of the suction discharge stream  6  is produced by force in the room, and this stream of air entraps the polluted air, and runs into the suction openings  5  ( 5   a  to  5   c ) of the suction discharge stream  6 . To reinforce the attracting action of the suction induction stream  21 , preferably, the air flow rate of the suction induction stream  21  should be determined appropriately, so that the polluted air staying beneath the ceiling  45  without being sucked into the suction openings  5  ( 5   a  to  5   c ) by inductive or attracting action of blow induction stream  21  may be promptly sucked into the suction openings  5  ( 5   a  to  5   c ), that is, into the discharge box  11 , before being diffused into the air due to effects of stream generated in the room by air conditioner or other cause.  
         [0097]     The actual section of this air stream (stream section) is a combination of uniform straight flow and vortex (entrapped flow) toward the suction openings  5  ( 5   a  to  5   c ), and the composed stream is basically a straight flow, but instead of turbulent flow, a swirl flow (entrapped flow) almost having no change in time series is included.  
         [0098]     The polluted air thus brought into the suction discharge stream  6  is discharged out of the room, together with this suction discharge stream  6 , by way of discharge box  11  and discharge duct  10 .  
         [0099]     At this time, the oily content of the suction discharge stream  6  including the polluted air is separated and removed by the grease remover  13  in the discharge box  11 , and since this grease remover  13  is disposed in the discharge box  11 , the blow induction streams  21 ,  21 ,  21  do not collide against the grease remover  13  to scatter about to form turbulent flow, so that a smooth induction discharge effect is assured.  
         [0100]     The intake device S disposed integrally with the discharger E and forming a principal component of the local ventilator PV is designed to generate downward intake stream  30  from the surrounding positions of the suction openings  5  ( 5   a  to  5   c ) of the suction discharge stream generator  2 .  
         [0101]     The intake device S has its intake opening  35  formed integrally with the discharge hood  15 , and in other words the discharge hood  15  is formed as an integral intake-discharge hood.  
         [0102]     In the specific structure of the intake device S, a base end  40   a  of an intake duct  40  is opened to the outdoor side, and its leading end  40   b  communicates with an intake box  41  formed integrally on the outer circumference of the discharge hood  15 , and the intake opening  35  is opened oppositely to the intake box  41  in the room. An intake fan  42  as intake stream source is provided at the base end  40   a  of the intake duct  40 .  
         [0103]     The intake box  41  is a box container of rectangular annular form surrounding the entire periphery of the discharge hood  15 .  
         [0104]     In the intake box  41  of the illustrated preferred embodiment, two intake ducts  40 ,  40  are connected, and as shown in  FIG. 2  and  FIG. 5 , the intake opening  35  is provided to extend around the whole peripheral wall of the rectangular annular form.  
         [0105]     Same as in the case of the discharge box  11 , as shown in  FIG. 1 , the axial direction of connection opening of intake box  41  for connecting the leading ends  40   b ,  40   b  of intake ducts  40 ,  40 , that is, the duct connection direction X 1 , and the axial direction of the intake opening  35 , that is, the intake opening intake stream direction Y 1  are arranged to intersect with each other, so that the stream is dispersed.  
         [0106]     The intake opening  35  is, as shown in  FIG. 1  to  FIG. 5 , opened along the outer contour of the lower edge of the discharge hood  15 , and is disposed to surround the whole periphery of combustion heating cooking device  1  and blow induction stream generator  3  in the room, and as described below, by the air curtain action of the blow intake stream  30  from the intake opening  35 , overflow of polluted air outside of the discharge region of suction opening  5  can be effectively prevented.  
         [0107]     The bottom of the intake box  41  having the intake opening  35  is set at the same level as the ceiling  45  mounting the discharge hood  15  as shown in  FIG. 1 ,  FIG. 3  and  FIG. 4 . In such structure, the blow intake stream  30  like air curtain from the intake opening  35  functions to prevent overflow of polluted air to outside from the discharge hood  15  as mentioned above, and also functions to prevent formation of temperature layer by agitating the indoor air, thereby keeping uniform the room temperature.  
         [0108]     In the intake device S having such configuration, by driving of intake fans  42 ,  42 , a downward blow intake stream  30  is generated like air curtain from the annular intake opening  35  at the level of the ceiling  45 , and by the air curtain action of the blow intake stream  30 , the polluted air leaking out of the discharge region of the suction openings  5  ( 5   a  to  5   b ) of the discharger E is pushed back by force again into the suction openings  5  ( 5   a  to  5   b ), and the room area in the periphery is agitated, and the room temperature becomes uniform.  
         [0109]     Next explanation is about setting condition of ventilation balance in a ventilation system in an applicable region of local ventilator PV including the discharge action by the discharger E, that is, the peripheral local region including the combustion heating type cooking device  1 , and also the entire kitchen in which the local ventilator PV is installed.  
         [0110]     For example, supposing the local ventilator PV of the preferred embodiment is applied in the combustion heating type cooking device (a) shown in  FIG. 19 , by installing the local ventilator PV, the ventilation balance should be established simultaneously in the entire kitchen and in the surrounding local area of the combustion heating type cooking device (a).  
         [0111]     The main purpose of the local ventilator PV is to cover up for the majority of air lost by discharge by the downward blow intake stream  30  supplied like air curtain from the intake opening  35  around the discharge hood  15 , and the blow induction streams  21 ,  21 ,  21 , and therefore by minimizing the effects of the fresh air introduced as downward blow intake stream  30  on the indoor air conditioning, the air conditioning load is decreased, and a great energy saving effect is obtained.  
         [0112]     By application of the local ventilator PV, by locally completing ventilation around the combustion heating type cooking device (a) shown in  FIG. 19 , it is intended to minimize the introduction of fresh air by intake to be air conditioning load. For this purpose, discharge amount=intake (fresh air) amount+induction air stream+polluted air amount+indoor entrapped air amount, and the equation of discharge amount=intake (fresh air) amount is demanded ultimately.  
         [0113]     More specifically, the suction flow rate of suction discharge stream  6  of the suction discharge stream generator  2  of the discharger E is set corresponding to the sum value of the blow flow rate of blow induction stream  21  by the blow induction stream generator  3 , the blow flow rate of the blow intake stream  30  by the intake device S, and the polluted air flow rate around the combustion heating type cooking device ( 1 ) guided by the blow induction stream  21 , and hence the balance of indoor air and local air is established simultaneously. In this case, the suction discharge stream  6  is discharged, and the blow induction stream  21  by the blow induction stream generator  3  and the guided air stream are covered by the indoor air, and the blow intake stream  30  is covered by the outdoor air.  
         [0114]     In this relation, the blow flow rate of the blow induction stream generator  3  is set smaller than the suction flow rate of the suction discharge stream generator  2 .  
         [0115]     In this case, the suction flow rate is determined by the suction side flow speed and guided air flow rate, and in this preferred embodiment, since the suction opening  5  is provided in the discharge box  11 , not directly in the discharge duct  10 , the suction side flow speed is the open side flow speed of the suction opening  5 .  
         [0116]     The blow speed of the suction induction stream  21  is set same as the suction side flow speed of the suction discharge stream  6 . Hence, the suction discharge stream  6  and blow induction stream  21  are same in flow speed, and flow uniformly in same direction, differing only in the flow rate, and therefore an upward uniform stream passing near the periphery of the cooking device  1  (an always uniform stream, not changing from time to time, in the state of stream at a certain stream section) is formed locally.  
         [0117]     Presently, there is a legal regulation about ventilation capacity, and when this local ventilator PV is applied in the ventilation system shown in  FIG. 19 , if the calculated ventilation capacity is smaller than the specified standard, additional ventilation means may be added in the room to compensate for shortage in ventilation.  
         [0118]     In the ventilation system in  FIG. 19 , a discharge duct (k) having a ceiling discharge fan (j) may be used as additional ventilation means  50 .  
         [0119]     This additional ventilation means  50  receives a detection or control signal from carbon dioxide sensor or the like (not shown) at other position than the local ventilation region by the local ventilator PV, and is driven automatically when running short of required ventilation capacity, and the indoor ventilation is increased to establish the ventilation balance.  
         [0120]     In such configuration, the statutory standard values can be satisfied without increasing the capacity of the blower of the local ventilator PV.  
         [0121]     Thus, in the discharger E of the preferred embodiment, as mentioned above, by the suction discharge stream  6  and blow induction stream  21 , an upward uniform stream high in controllability, passing around and near the combustion heating type cooking device  1  as cause of polluted air can be formed, and by the guiding action of the blow induction stream  21 , the polluted air around the combustion heating type cooking device  1  is collected and delivered by force into the suction discharge stream  6 . In other words, a stream of air from around the combustion heating type cooking device  1  toward the suction opening  5  of the suction discharge stream  6  is produced by force in the room, and this stream of air takes up the polluted air, and is brought to the suction opening  5  of the suction discharge stream  6 .  
         [0122]     Thus, since the upward uniform stream for discharging the polluted air by force passes through the area of the combustion heating type cooking device  1 , and is discharged without enclosing the combustion heating type cooking device  1 , and there is no interference with the working area of the workers or cooks, and the habitability and working efficiency are not spoiled.  
         [0123]     Besides, by completing the ventilation locally by discharge, the ventilation capacity and air conditioning capacity can be decreased, and the ventilation and air conditioning capacity can be kept low, and therefore the initial cost and running cost of invention and air conditioning facilities can be saved, and also consumption of electric energy is reduced, so that output of global warming gases can be reduced.  
         [0124]     Further, since the ventilation capacity and air conditioning capacity can be decreased substantially, a sufficient allowance is made in the capacity of the existing power source and air conditioning facilities, and the existing ducts and other ventilation equipment can be directly utilized effectively.  
         [0125]     The leading end  10   a  of the discharge duct  10  of the suction discharge stream generator  2  is opened to the outdoor side, and its base end  10   b  communicates with the discharge box  11  formed like a box container, and the suction openings  5  ( 5   a  to  5   b ) of the suction discharge stream  6  are opened oppositely to the discharge box  11  in the room, and the disposing positions of the suction openings  5  ( 5   a  to  5   b ) can be set freely within the discharge side range of the discharge box  11 , so that the existing ducts and others can be directly utilized effectively.  
         [0126]     By the operation of the ventilation system having such discharge E and local ventilator PV, the local ventilation is completed in the discharge region of the discharger E and local ventilator PV as mentioned above, and the flow of air in this region is not a mixed state of various air streams same as in the conventional overall ventilation system in  FIG. 19 , but is clearly separate between intake stream and discharge stream as shown in  FIG. 1 ,  FIG. 3 , and  FIG. 4 .  
         [0127]     As a result, heat and fresh air having effects on circulation stream of air conditioner (i) are same as in general living quarters, and general ventilation capacity in the kitchen room, that is, ventilation by driving of the discharger (j) is also applicable to the indoor space other than ventilation region by driving of the discharger E, and hence the ventilation capacity is kept low to the level of general living quarters.  
         [0128]     In other words, since local discharge and ventilation can be completely by the local ventilator PV, the ventilation capacity and air conditioning capacity in the entire kitchen can be reduced.  
         [0129]     As a result, by suppressing the ventilation capacity and air conditioning capacity, the initial cost and running cost of invention and air conditioning facilities can be saved, and also consumption of electric energy is reduced, so that output of global warming gases can be reduced.  
       Embodiment 2  
       [0130]     This preferred embodiment is shown in  FIG. 7 , and it is a modification of blow induction stream generator  3  in embodiment 1.  
         [0131]     That is, an induction stream generating device  122  of the induction stream generator  3  of the preferred embodiment is suspended from the discharge hood  15  by suspending means  54  such as SUS chain, and the upper part of the device main body  26  of cylindrical shape functioning also as straightening part is blow nozzle  28  having a blow opening  20 , and a blow fan  27  as induction stream source is vertically provided concentrically in the lower part of the device main body  26 , and its air source is indoor air.  
         [0132]     The blow nozzle  28  is vertical and upright so that its axial line may pass nearly the center of the suction opening  5  of the discharge box  11  of the suction discharge stream generator  2 , and the blow induction stream  21  is blown out vertically upward toward the inside of the suction opening  5  from the blow opening  20 .  
         [0133]     Other structure and action are same as in embodiment 1.  
       Embodiment 3  
       [0134]     This preferred embodiment is shown in  FIG. 8 , and it is a modification of blow induction stream generator  3  in embodiment 1.  
         [0135]     That is, in the induction stream generator  3  of the preferred embodiment, the induction stream generating device  122  of embodiment 2 is an independent self-supporting type, disposed upright at the side of the cooking range stand  125  of the combustion heating type cooking device  1  by means of supporting leg  123 .  
         [0136]     Other structure and action are same as in embodiment 1.  
       Embodiment 4  
       [0137]     This preferred embodiment is shown in  FIG. 9 , and it is a modification of blow induction stream generator  3  in embodiment 1.  
         [0138]     That is, in the induction stream generator  3  of the preferred embodiment, an induction stream generating device  222  consists separately of device main body  26  and blow fan  27  of the induction stream generating device  122  in embodiment 2, and its air s source is outdoor air.  
         [0139]     Specifically, the cylindrical device main body  26  is buried and disposed upright in the cooking range stand  125  of the combustion heating type cooking device  1 , and the lower part of the device main body  26  communicates with the outdoor side by way of intake duct  223 , and a stream straightening device  224  of cylindrical shape is installed in horizontal state to the outdoor end of the intake duct  223 , and the blow fan  27  as induction stream source is provided inside of this stream straightening device  224  horizontally and concentrically, and its air source is outdoor air.  
         [0140]     Other structure and action are same as in embodiment 1.  
       Embodiment 5  
       [0141]     This preferred embodiment is shown in  FIG. 10  to  FIG. 12 , and the local ventilator PV is for domestic kitchen in general household or relatively small building.  
         [0142]     In this local ventilator PV, the suction discharge stream generator  2  is disposed at the upper position of the cooking device  1  installed near the room wall  60 , that is, closely to the indoor wall  60  in the area of ceiling  45  above the cooking device  1 , and the discharge duct  10  is opened to outdoor side by penetrating through the wall  60 , and discharge fan  12  is provided at the leading end  10 .  
         [0143]     The discharge box  11  and discharge hood  15  of the suction discharge flow generator  2  are formed in a unit structure integral with the intake box  41  of the intake device S as shown in  FIG. 11 .  
         [0144]     The discharge hood  15  is formed to surround three sides of the suction opening  5  of the discharge box  11 , and the indoor wall  60  forms part of discharge hood  15 . By contrast, the intake opening  35  of the intake box  41  is disposed and formed to surround the outer periphery of the discharge hood  15 , excluding the portion of indoor wall  60 .  
         [0145]     The intake duct  40  of the intake device S is opened to the outdoor side through an indoor wall  61  opposite to the indoor wall  60  from the intake box  41 , and intake fan  42  is provided at its base end  40   a.    
         [0146]     The blow induction stream generator  3  is integrated with the combustion heating type cooking device  1 , and its specific structure is shown in  FIG. 12 .  
         [0147]     That is, the blow induction stream generator  3  has an induction stream generating device  22  integrally assembled in the cooking range stand  125  at the rear side of the cooking range stand  125  of the combustion heating type cooking device  1 .  
         [0148]     In this induction stream generating device  22 , the upper part of the device main body  26  of hollow parallelepiped shape is blow nozzle  28  having blow opening  20 , and blow fans  27 ,  27  as induction stream sources are provided horizontally and forward at the front side of the device main body  26 , and its air source is indoor air.  
         [0149]     The blow nozzle  28  is composed so that its axial line may be extended toward the inside of the suction opening  5  of the discharge box  11 . That is, the blow nozzle  28  of the induction stream generating device  22  is obliquely upright, as shown in  FIG. 10 , so that its axial line may pass nearly the center of the suction opening  5 , and the blow induction stream  21  is blown obliquely toward the inside of the suction opening  5  from the blow opening  20 .  
         [0150]     In the discharger E having such configuration, by driving of discharge fan  12  of the suction discharge stream generator  2 , an upward suction discharge stream  6  consecutive into the suction opening  5  is formed, and by driving of blow fans  27 ,  27  of the blow induction stream generator  3 , an inclined upward blow induction stream  21  is generated from the blow opening  20  of the blow nozzle  22  extending straightly into the suction opening  5 .  
         [0151]     As a result, by both streams  6 ,  21 , an upward uniform stream is formed to pass through a position around the combustion heating type cooking device  1 , and by the guiding action of the blow induction stream  21  by the blow induction stream generator  3 , the polluted air around the combustion heating type cooking device  1  including hot jet flow of contaminants generated by combustion and heating of the combustion heating type cooking device  1  is collected and delivered by force into the suction discharge stream  6 . The polluted air thus brought into the suction discharge stream  6  is discharged out of the room, together with the suction discharge stream  6 , by way of the discharge box  11  and discharge duct  10 .  
         [0152]     In the intake device S, by driving of intake fan  42 , from the U-shaped intake opening  35  at the level of the ceiling  45 , a downward blow intake stream  30  is generated like air curtain, and by the air curtain action of the blow intake stream  30 , the polluted air escaping out of the discharge region of the suction opening  5  of the discharger E is pushed back by force again into the suction opening  5 , and the room air in this peripheral area is agitated, and the room temperature becomes uniform.  
       Embodiment 6  
       [0153]     This preferred embodiment is shown in  FIG. 13 , and it is a modification of blow induction stream generator  3  in embodiment 5.  
         [0154]     That is, the induction stream generator  3  of the preferred embodiment is also integral with the combustion heating type cooking device  1 , and as shown in the drawing, an induction stream generating device  322  is integrally assembled at the rear side of the cooking range stand  125  of the combustion heating type cooking device  1 .  
         [0155]     In this induction stream generating device  322 , the upper part of the device main body  26  of L-shaped rectangular parallelepiped shape of hollow shape is blow nozzle  28  having blow opening  20  at the back side of the table cooking range  1   e , and the horizontal portion  26   b  of the device main body  26  composes a mounting section of cooking range stand  125  for mounting the table cooking range  1   e . In the front part of the horizontal portion  26   b , blow fans  27 ,  27  as induction stream sources are provided horizontally and forward, and its air source is indoor air.  
         [0156]     Other structure and action are same as in embodiment 1.  
       Embodiment 7  
       [0157]     This preferred embodiment is shown in  FIG. 14 , and it is a modification of blow induction stream generator  3  in embodiment 5.  
         [0158]     That is, the induction stream generator  3  of the preferred embodiment is also integral with the combustion heating type cooking device  1 , and as shown in the drawing, an induction stream generating device  422  is integrally assembled into the combustion heating type cooking device  1 .  
         [0159]     In this induction stream generating device  422 , the device main body  26  of hollow rectangular parallelepiped shape is disposed at the rear side of the cooking ranges of combustion heating type cooking device  1 , and the blow nozzle  28  has the blow opening  20 , and the horizontal portion  26   b  of the device main body  26  composes the main body of the cooking ranges  1   f ,  1   f ,  1   f . In the front part of the horizontal portion  26   b , blow fans  27 ,  27  as induction stream sources are provided horizontally and forward, and its air source is indoor air.  
         [0160]     Other structure and action are same as in embodiment 1.  
       Embodiment 8  
       [0161]     This preferred embodiment is shown in  FIG. 15 , and it is a modification of blow induction stream generator  3  in embodiment 5.  
         [0162]     That is, the induction stream generator  3  of the preferred embodiment is also integral with the combustion heating type cooking device  1 , and as shown in the drawing, an induction stream generating device  522  is integrally assembled into the back portion of the combustion heating type cooking device  1 .  
         [0163]     In this induction stream generating device  522 , the device main body  26  of hollow truncated quadrangular pyramid shape is disposed at the rear side of the cooking ranges  1   f ,  1   f ,  1   f  of combustion heating type cooking device  1 , and the blow nozzle  28  has the blow opening  20 , and blow fans  27 ,  27  as induction stream sources are provided horizontally and forward in the front part of the device main body  26 , and its air source is indoor air.  
         [0164]     Other structure and action are same as in embodiment 1.  
       Embodiment 9  
       [0165]     This preferred embodiment is shown in  FIG. 16  to  FIG. 18 , in which the local ventilator PV is installed as smoke separator as principal component of a smoking room.  
         [0166]     The smoking room R is shown in a plan view of  FIG. 16 , in which two rectangular partition walls Ra, Rb are concrete walls, and other two walls Rc, Rd are class partition walls, and the partition wall Rc has an opening  70  for access of people. In the smoking room R, a smoking table  71  is disposed closely to the partition wall Rd, and the remaining indoor space is the smoking corner. On the smoking table  71 , plural (three in the shown embodiment) ash trays  72 ,  72 ,  72  are prepared so as to be removed and exchanged.  
         [0167]     In the local ventilator PV of the preferred embodiment, the discharger E is provided in the smoking room R, and the intake device S is provided outside of the partition wall Rc of the smoking room R. The intake device S may be also provided inside of the partition wall Rc of the smoking room R.  
         [0168]     The suction discharge stream generator  2  of the discharger E is disposed at a position above the smoking table  71  at the most concentrated position of cigarette smoke containing contaminants (nicotine, tar) as cause of polluted air, that is, in the portion of the ceiling  45  above the smoking table  71 , closely to the partition wall Rd.  
         [0169]     The suction discharge stream generator  2  has a basic configuration same as in the foregoing preferred embodiments, and the leading end  10   a  of the discharge duct  10  is opened to the outdoor side, and its base end  10   b  communicates with the discharge box  11 , and the suction opening  5  is opened in the room, opposite to the bottom  11   a  of the discharge box  11 . At the leading end  10   a  of the discharge duct  10 , discharge fan  12  is provided as the discharge stream source.  
         [0170]     The discharge box  11  in the illustrated preferred embodiment is formed like a box, and almost entire bottom  11   a  of square shape is suction opening  5 . Inside the discharge box  11 , a dust collector  113  is provided for separating and removing oily matter in the discharge.  
         [0171]     On the indoor side outer circumference of the suction opening  5 , discharge hood  15  of truncated quadrangular pyramid shape is provided. This discharge hood  15  is disposed as shown in  FIG. 16  so as to overlap almost entirely with the top of the smoking table  71  except for the outer peripheral portion, and its inner peripheral wall (not shown) is formed in the truncated quadrangular pyramid shape inclined wall in a climbing slope toward the suction opening  5 .  
         [0172]     The blow induction stream generator  3  is disposed upright near the inner periphery of the outer periphery disposing the center of the top of the smoking table  71 , that is, the ash trays  72 ,  72 ,  72 . The induction stream generating device  622  of the blow induction stream generator  3  is composed as shown in  FIG. 17  and  FIG. 18 , in which the top of the device main body  26  in long tubular shape is blow nozzle  28  having blow opening  20 , and blow fan (not shown) as induction stream source is provided in the lower part of the device main body  26 , and its air source is indoor air. The blow nozzle  28  is composed so that its axial line may be extended toward the inside of the suction opening  5  of the discharge box  11 .  
         [0173]     In the discharger E having such configuration, by driving of the discharge fan  12  of the suction discharge stream generator  2 , an upward suction discharge stream  6  consecutive into the suction opening  5  is generated, and by driving of the blow fan of the blow induction stream generator  3 , an upward blow induction stream  21  is generated from the blow opening  20  of the blow nozzle  22  of the induction stream generating device  622 , extending straightly toward the suction opening  5 .  
         [0174]     By these streams  6 ,  21 , the upward uniform stream is formed to ascent and pass the center of the top of the smoking table  71 , and by guiding action of the blow induction stream  21  by the blow induction stream generator  3 , the polluted air including the cigarette smoke generated in the indoor space of the smoking room R mainly around the smoking table  71  is collected and delivered by force into the suction discharge stream  6 .  
         [0175]     The intake device S, different from embodiments 1 to 8, is disposed independently of the discharger E, outside of the partition wall Rc of the smoking room R.  
         [0176]     The intake device S has the base end  40   a  of the intake duct  40  opened to the air in an adjacent room or to fresh air, and intake fan  42  as intake stream source is provided in the base end  40   a . The leading end  40   b  of intake duct  40  communicates with the intake box  41 , and an intake opening  35  is opened in this intake box  41 , opposite to the outside of the opening  70  of the smoking room R. When air conditioned air in the adjacent room is used as the intake source of the intake device S, it is beneficial because the smoking room R is air conditioned somewhat, and independent air conditioner may not be required in the smoking room R, and the stream is the smoking room R is not disturbed.  
         [0177]     The intake box  41  is a box container of rectangular parallelepiped, and the opening width of the intake opening  35  in this intake box  41 , that is, the air curtain blow width W 1  is set wider than the opening width W 2  of the opening  70  of the smoking room R.  
         [0178]     The intake opening  35  is opened as shown in  FIG. 16 , so as to be close to the partition wall Rc of the smoking room R in a plan view, and parallel to the partition wall Rc, and by the air curtain action of the blow intake stream  30  from the intake opening  35 , leak of polluted air out of the smoking room R can be effectively prevented.  
         [0179]     That is, in the intake device S having such configuration, by driving of intake fan  42 , downward blow intake stream  30  is generated like air curtain from the intake opening  35  at the level of ceiling  45 , and this blow intake stream  30  flows into the smoking room R because the smoking room R is in negative pressure by the action of the discharger E. As a result, by the air curtain action of the blow intake stream  30 , the polluted air escaping out of the smoking room R, that is, outside of the discharge region of the suction opening  5  of the discharger E is pushed back again into the smoking room R, and further pushed back by force into the suction opening  5 .  
         [0180]     Thus, in the smoking room R having such local ventilator PV, the majority of the discharge discharged by the discharger E is covered by the intake from the air curtain by the intake device S, and effects of discharge in air conditioning in the adjacent room are minimized.  
         [0181]     In the technical standard of “Passive smoking prevention law” enforced in 2003, the air flow into the room is required to assure flow velocity of 0.2 m/sec at the opening position, and in the ventilation system using the local ventilator PV of the embodiment, a stream of air toward the suction opening  5  is produced by force in the smoking room R, and escape of contaminants (nicotine, tar) out of the room is prevented at a small air flow rate.  
         [0182]     To conform to “Passive smoking prevention law”, if it is difficult to increase the ventilation capacity in the existing smoking room, or extension works of air conditioners are difficult physically or economically, the existing ducts and air conditioning facilities can be effectively utilized, and extra works are minimized.  
       Embodiment 10  
       [0183]     This preferred embodiment is shown in  FIG. 19  to  FIG. 21 , in which the structure of the discharger E of the local ventilator PV in embodiment 1 is slightly modified.  
         [0184]     In the discharger E of the preferred embodiment, guide plates  100  are provided individually in blow nozzles  28 ,  28 ,  28  of three induction stream generating devices  22   a ,  22   b ,  22   c , and the structure is designed to make use of Coanda effect.  
         [0185]     That is, the guide plates  100 ,  100 ,  100  are provided as shown in  FIG. 19  to  FIG. 21 , to extend from the blow opening  20  of each blow nozzle  28  toward the inside of the suction openings  5   a ,  5   b , and  5   c  of the suction discharge stream generator  2 , and the blow induction stream  21  blown out from the blow opening  20  is guided securely and stably into the inside of the suction opening  5   a.    
         [0186]     Specifically, the guide plate  100  of the first induction stream generating device  22   a  is extended, as shown in  FIG. 21 , from the blow opening  20  of the blow nozzle  28  in inclined upright position toward the first suction opening  5   a , and its upper edge  100   a  is positioned slightly lower than the lower edge of the discharge hood  15 . The blow induction stream  21  from the blow opening  20  is attracted to one side of the guide plate  100  by Coanda effect, and is blown out obliquely upward along this one side, and finally guided into the inside of the suction opening  5   a.    
         [0187]     On the other hand, the guide plates  100 ,  100  of the second and third induction stream generating devices  22   b ,  22   c  are extended, as shown in  FIG. 20 , from the middle of blow openings  20 ,  20  of the blow nozzles  28 ,  28  in vertical upright position toward nearly the middle of the second and third suction openings  5   b ,  5   c , and their upper edge  100   a  is positioned slightly lower than the lower edge of the discharge hood  15 . The blow induction stream  21  from the blow opening  20  is attracted to both sides of the guide plate  100  by Coanda effect, and is blown out obliquely upward along the both sides, and finally guided into the inside of the suction openings  5   b ,  5   c.    
         [0188]     In the discharger E having such configuration, by driving of discharge fans  12 ,  12  of the suction discharge stream generator  2 , upward suction discharge streams  6 ,  6 ,  6  consecutive to the inside of suction openings  5  ( 5   a  to  5   c ) are generated, and by driving of blow fans  27 ,  27 , . . . of the blow induction stream generator  3 , upward blow induction streams  21 ,  21 ,  21  are generated, extending from the blow opening  20  of the blow nozzle  22  in the induction stream generating devices  22   a ,  22   b ,  22   c , straightly toward the suction openings  5  ( 5   a  to  5   c ).  
         [0189]     In this case, the blow induction stream  21  from each blow opening  20  is attracted to the guide plate  100  by Coanda effect of the guide plate  100 , and is stably accelerated (at double speed, approximately, without guide plate  100 ), and is securely guided into the inside of the first, second, and third suction openings  5   a ,  5   b ,  5   c . In other words, in the discharge E of the preferred embodiment, the blow induction stream  21  is same in air flow rate as in embodiment 1, while the speed is increased and the stream is stabilized.  
         [0190]     The upward extending length of guide plate  100  may be properly determined depending on the purpose of place of installation as far as Coanda effect may be expressed effectively. For example, in the illustrated preferred embodiment, the upper edge  100   a  of guide plate  100  is extended slightly lower than the lower edge of the discharge hood  15 , but it may be further extended up to the inside suction openings  5  ( 5   a  to  5   c ).  
         [0191]     If the blow openings  20  and first, second and third suction openings  5   a ,  5   b ,  5   c  are not provided on a straight line, but are biased, when the guide plate  100  is deflected, and guide surfaces from the blow openings  20 ,  20 ,  20  to the first, second and third suction openings  5   a ,  5   b ,  5   c  are formed, by Coanda effect, the axis of blow induction stream  21  linking these upper and lower openings  20 ,  5  ( 5   a ,  5   b ,  5   c ) by curves can be formed.  
         [0192]     Other structure and action are same as in embodiment 1.  
         [0193]     The foregoing embodiments 1 to 10 merely show preferred examples of the invention, and the invention is not limited by them alone, but may be changed and modified freely within the scope thereof.  
       INDUSTRIAL APPLICABILITY  
       [0194]     As specifically described herein, according to the invention, by suction discharge stream and blow induction stream, an upward uniform stream high in controllability passing around the contaminant source to cause polluted air is formed, and by the guiding action of blow induction stream, the polluted air around the contaminant source is collected and delivered by force into the suction discharge stream, and therefore the upward uniform stream for discharging the polluted air by force can be discharged without enveloping the contaminant source by passing around the contaminant source, and there is no interference with the working area of the workers, and the discharge and ventilation technology not spoiling habitability and working efficiency can be presented.  
         [0195]     By completing ventilation locally by discharge, the ventilation capacity and air conditioning capacity can be decreased, and the capacity of ventilation and air conditioning facilities can be kept low, and the initial cost and running cost of ventilation and air conditioning facilities are saved, and also by reduction of consumption of electric energy, output of global warming gases can be decreased.  
         [0196]     As a result of considerable decrease of ventilation capacity and air conditioning capacity, a sufficient allowance is made in the exiting power source capacity and air conditioning capacity, and existing ducts and other ventilation facilities can be directly utilized effectively.  
         [0197]     The leading end of the discharge duct of the suction discharge stream generating means is opened to the outdoor side, and its base end communicates with the discharge box formed as box container, and the suction opening of the suction discharge flow is opened in the room opposite to this discharge box, and hence the position of the suction opening can be set freely within the discharge side range of the discharge box, and the degree of freedom of layout of the source of contaminant, such as cooking device, can be increased, and existing ducts and others can be effectively utilized.  
         [0198]     In other words, in recent modifications of existing buildings, heat generating appliances are intensively installed such as office automation equipment and electrical appliances, and capacity shortage of power source and air conditioning is a serious problem. Such modification works are therefore often accompanied by extra works for electrical or air conditioning facilities, and the cost is increased. According to the invention, as discussed above, the air conditioning and ventilation capacity can be decreased from the conventional level, and an allowance is made in the existing power source capacity and air conditioning capacity, and the existing ducts (air passages) can be used, and there is still an allowance, and extra works are decreased.