Patent Publication Number: US-2019166928-A1

Title: Ventilation apparatus and a garment on which the ventilation apparatus can be mounted

Description:
CROSS-REFERENCE 
     This application is the US national stage of International Patent Application No. PCT/JP2017/027567 filed on Jul. 28, 2017, which claims priority to Japanese Patent Application No. 2016-151607 filed on Aug. 1, 2016 and Japanese Patent Application No. 2016-222796 filed on Nov. 15, 2016. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a ventilation apparatus, which is for delivering air to a user, and to a garment, on which the ventilation apparatus is mountable. 
     BACKGROUND ART 
     A raincoat with a ventilation apparatus for blowing air to a user is disclosed in Japanese Unexamined Utility Model Application Publication No. S64-30308. 
     SUMMARY OF THE INVENTION 
     Because a user who wears such a raincoat with the known ventilation apparatus will be cooled by the air from the ventilation apparatus, it is possible to achieve a comfortable work environment. Nevertheless, there has been a demand to miniaturize the ventilation apparatus in order to improve the work efficiency of the user. 
     It is therefore an object of the present teachings to provide a more rational technique with regard to a ventilation apparatus, which has been made more compact, and to a garment, on which the ventilation apparatus is mountable. 
     In a first aspect of the present teachings, a ventilation apparatus configured to be mountable on a garment comprises: a motor; a fan, which is rotationally driven by the motor; and a ventilation-apparatus-main-body part, which comprises intake ports and exhaust ports and houses the motor and the fan. The motor is constituted by a brushless motor. 
     In a ventilation apparatus with regard to the first aspect, ventilation is provided to the user by using the brushless motor to rotationally drive the fan. By using a brushless motor, which is compact and high-output, overall miniaturization can be achieved while also ensuring a suitable ventilation performance of the ventilation apparatus. 
     The ventilation apparatus can further comprise an operation part (e.g., an operation panel and/or handheld controller), which enables the user to manually input changes in airflow by generating signals that are output to a controller (central processing unit), which controls the rotational speed, etc. of the brushless motor based on the signals from the operation part. The operation part may comprise one or more buttons or rotary knobs that can be disposed on a main body of the operation part, which has been configured (manufactured) independently of the ventilation apparatus. It is noted that the brushless motor and the operation part are electrically connected to a battery. 
     The controller (central processing unit) can be disposed in the main body of the ventilation apparatus or in the main body of the operation part. Furthermore, the controller can be provided on an electrical cable for electrically connecting the brushless motor, the operation part, and the battery. It is noted that the controller can be constituted by a central processing unit; furthermore, by using signals generated by functional circuit parts, it is possible to control the rotational speed of the brushless motor and thereby provide additional functions to the ventilation apparatus. It is noted that the ventilation apparatus can be configured such that it can use a battery that the user already owns for use with other types of electric power tools. 
     In addition, in a second aspect of the present teachings, a ventilation apparatus configured to be mountable on a garment comprises: a motor; a fan, which is rotationally driven by the motor; and a ventilation-apparatus-main-body, which comprises intake ports and exhaust ports and houses the motor and the fan. The motor comprises a motor-main-body, which has a stator and a rotor, and a drive shaft. The fan comprises a fan-main-body, which is mounted on the drive shaft, and blades. The motor-main-body is configured to be shorter than the blades in an output-shaft direction of the drive shaft. 
     According to this configuration, because the motor-main-body can fit within (is shorter than) the length of the blade in the output-shaft direction of the drive shaft, it is possible to prevent lengthening of the dimension of the ventilation apparatus in the output-shaft direction of the drive shaft. 
     In particular, if the motor is a compact and high-output brushless motor, then the motor-main-body and the fan-main-body can be shortened in the output-shaft direction of the drive shaft, and it becomes possible to shorten the ventilation apparatus overall commensurately. 
     In addition, in yet another aspect of the present teachings, the ventilation apparatus can comprise a temperature sensor and a temperature-information-based control part configured to control the rotational speed of the motor based on temperature information from the temperature sensor. 
     According to this configuration, it is possible, for example, to increase the rotational speed of the motor when the temperature is high and to decrease the rotational speed of the motor when the temperature is low. That is, the ventilation apparatus can adjust the airflow automatically in accordance with the temperature information. 
     For example, on the garment on which the ventilation apparatus is mounted, the temperature sensor can be mounted in an area (inner-side area) that faces the user side or an area (outer-side area) on the opposite side of the inner-side area. 
     The temperature-information-based control part can be constituted by a controller that controls the rotation of the brushless motor. 
     In addition, in yet another aspect of the present teachings, the ventilation apparatus can comprise: a receiver, which receives biological information of a user sent by a mobile computer; and a biological-information-based control part configured to control the rotational speed of the motor based on the biological information from the receiver. 
     A so-called wearable computer, a smart phone, and the like can be given as examples of specific configurations of the mobile computer. In addition, it is also possible to use a biological-information detecting apparatus, which has been independently configured to detect specific biological information. Information transmission between the mobile computer and the receiver can be performed wirelessly or by wire. 
     In addition, body temperature, heart rate, perspiration rate, and the like can be given as examples of representative biological information. 
     According to this configuration, the ventilation apparatus can adjust the airflow automatically in accordance with the biological information. 
     In addition, in yet another aspect of the present teachings, the main body of the ventilation apparatus can be configured to house a filter between the intake ports and the exhaust ports. 
     According to this configuration, it is possible to reduce the accumulation of dust in the interior of the ventilation-apparatus-main-body, the blowing out of dust to the user, etc. 
     A paper filter, a nonwoven fabric filter, a fabric filter, and a foam body filter can be given as examples of specific configurations of the filter. In particular, a HEPA (High Efficiency Particulate Air) filter can be used to increase the efficiency of the filter function. In addition, if a filter is used that has air permeability lower than a typical paper filter, as in a HEPA filter, then the motor is preferably constituted by a brushless motor. 
     In addition, in yet another aspect of the present teachings, the ventilation apparatus can comprise a filter-condition-detecting part configured to detect a condition that reflects when too much dust has accumulated on or in the filter. 
     According to this configuration, for example, because it is possible to detect whether or not dust greater than a prescribed amount has accumulated on or in the filter, dust can be removed from the filter in a timely and efficient manner. 
     The filter-condition-detecting part can be configured to detect, for example, the rotational speed of the motor and changes in the electric-current value supplied to the motor. In this case, if an electric-current value is detected that is higher than a threshold value while the motor is being rotationally driven at a prescribed rotational speed, the filter-condition-detecting part can determine that dust greater than the prescribed amount has accumulated on or in the filter. 
     In addition, the filter-condition-detecting part can be configured to detect the rotational speed of the motor and the airflow produced by the fan. In this case, if an airflow is detected that is lower than a threshold value while the motor is being rotationally driven at a prescribed rotational speed, then the filter-condition-detecting part can determine that dust greater than the prescribed amount has accumulated on or in the filter. 
     The ventilation apparatus with regard to this aspect can further comprise a notifying part that generates and outputs a notification concerning the condition of the filter based on information from the filter-condition-detecting part. The notifying part can be configured to transmit, to the user, for example, visual information using a light-emitting device, audio information using a buzzer, or the like. 
     In addition, in yet another aspect of the present teachings, the ventilation apparatus can comprise a dust-removing part configured to remove, from the filter, dust that has accumulated on or in the filter. 
     According to this configuration, because a dust-removing part removes dust that has accumulated on the filter, the replacement frequency of the filter can be reduced. Consequently, it becomes possible to provide the user with a ventilation apparatus that excels economically. 
     The dust-removing part can comprise, for example, a motor-reverse-rotation part that causes the motor to rotate in its reverse direction, thereby generating an airflow in the opposite direction. According to this configuration, it becomes possible to generate an airflow in the direction that removes dust from the filter. 
     In addition or in the alternative, the dust-removing part can be configured, for example, by disposing an elastic member on the inner side of the filter. According to this configuration, when the motor is being driven to supply ventilation to the user, the filter sticks to the elastic member owing to the airflow in the normal direction, and the elastic member is compressed inward. On the other hand, when the rotary drive of the motor stops, the filter is abruptly moved outwardly by the elastic member restoring to its original state. Owing to the vibration (shaking) of the filter that occurs at this time, dust can be ejected from the filter. 
     In addition, in yet another aspect of the present teachings, the ventilation apparatus can comprise a Peltier element. 
     According to this configuration, the ventilation apparatus can deliver (supply) air that has been cooled by the Peltier element or air that has been heated by the Peltier element. 
     In addition, in yet another aspect of the present teachings, the ventilation apparatus can comprise a battery for driving the motor. 
     It is noted that the battery is preferably a battery that is configured to be mounted on a plurality of power tools. In this case, it is possible that a battery for power tools already owned by the user can be used in the ventilation apparatus. That is, because the user need not purchase a new battery for the ventilation apparatus, this embodiment is particularly economical. 
     In addition, in yet another aspect of the present teachings, the intake ports can comprise a first intake port that opens in the output-shaft direction of the drive shaft and a second intake port that opens in a direction that intersects the drive shaft. According to this configuration, the ventilation apparatus can efficiently aspirate air via the two intake ports that open in different directions. 
     In addition, as an aspect of the garment with regard to the present teachings, it can be configured such that the ventilation apparatus is mountable thereon. 
     According to this configuration, because the user need only put on the garment to use the ventilation apparatus, the ergonomics of the ventilation apparatus can be improved. A jacket, which is worn on the outermost-surface side of the upper body of the user, pants worn on the lower half of body, and overalls, in which the jacket and pants are integrated, can be given as examples of specific garments according to the present teachings. With regard to the jacket, it may have sleeves or no sleeves. 
     The garment can have an opening for inserting the ventilation apparatus therethrough. In addition, it is possible to provide an attachment part for connecting the garment and the ventilation apparatus to one another. 
     In addition, the garment can have: an inner-side area, which faces toward the user side when the garment is worn by the user; an interior part, which constitutes at least part of the inner-side area; an outer-side area, which is located on the side opposite that of the inner-side area; an exterior part, which constitutes at least part of the outer-side area; an internal-space part, which is provided between the interior part and the exterior part; and at least one ventilation opening, which is (are) provided in the internal-space part. The ventilation opening(s) can be configured to face the neck and/or armpits of the user. 
     According to this configuration, it becomes possible to deliver (supply) the air from the ventilation apparatus to the user by way of the internal-space part and via the ventilation opening. 
     The present teachings provide rational techniques for making a ventilation apparatus more compact and for designing a garment, on which the ventilation apparatus is mountable. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an explanatory diagram that shows an overview of a ventilation apparatus according to a first embodiment. 
         FIG. 2  is a side view of the ventilation apparatus. 
         FIG. 3  is a rear view of the ventilation apparatus. 
         FIG. 4  is a front view of the ventilation apparatus. 
         FIG. 5  is a side cross-sectional view of the ventilation apparatus. 
         FIG. 6  is an explanatory diagram that shows the configuration of a fan. 
         FIG. 7  is a front perspective view that shows an overview of a garment. 
         FIG. 8  is a block diagram that shows a control system of a motor. 
         FIG. 9  is a rear perspective view that shows an overview of the garment. 
         FIG. 10  is an explanatory diagram that shows the configuration of an inner-side area. 
         FIG. 11  is an explanatory diagram that shows the garment, on which the ventilation apparatus has been mounted. 
         FIG. 12  is a block diagram that shows the control system of the motor of the ventilation apparatus according to a second embodiment. 
         FIG. 13  is a block diagram that shows the control system of the motor of the ventilation apparatus according to a third embodiment. 
         FIG. 14  is an explanatory diagram that shows the configuration of the ventilation apparatus according to a fourth embodiment. 
         FIG. 15  is an explanatory diagram that shows the configuration of the ventilation apparatus according to a fifth embodiment. 
         FIG. 16  is a block diagram that shows the control system of the motor of the ventilation apparatus according to a sixth embodiment. 
         FIG. 17  is an explanatory diagram that shows the configuration of the ventilation apparatus according to a seventh embodiment. 
         FIG. 18  is an explanatory diagram that shows the configuration of the ventilation apparatus according to an eighth embodiment. 
         FIG. 19  is a block diagram that shows the control system of the motor of the ventilation apparatus according to a ninth embodiment. 
         FIG. 20  is a block diagram that shows the control system of the motor of the ventilation apparatus according to a tenth embodiment. 
         FIG. 21  is an explanatory diagram that shows the configuration of the ventilation apparatus according to an eleventh embodiment. 
         FIG. 22  is an explanatory diagram that shows the configuration of the operation part of the ventilation apparatus according to a twelfth embodiment. 
         FIG. 23  is an explanatory diagram that shows the configuration of the operation part of the ventilation apparatus according to a thirteenth embodiment mounted on a jacket. 
         FIG. 24  is a rear oblique view of the ventilation apparatus according to a fourteenth embodiment. 
         FIG. 25  is a side view of the ventilation apparatus. 
         FIG. 26  is a rear view of the ventilation apparatus. 
         FIG. 27  is a front view of the ventilation apparatus. 
         FIG. 28  is a cross-sectional view taken along line A-A in  FIG. 26 . 
         FIG. 29  is an explanatory diagram that shows a garment with regard to a modified example on which two ventilation apparatuses have been mounted. 
     
    
    
     DETAILED DISCLOSURE 
     The following explains, based on  FIG. 1  to  FIG. 23 , a first embodiment to a thirteenth embodiment, according to the present teachings, of a ventilation apparatus and a garment, on which the ventilation apparatus is mounted.  FIG. 24  to  FIG. 28  are explanatory diagrams of a fourteenth embodiment. 
     Structural elements, components, and the like of the second embodiment to the fourteenth embodiment having structures, functions, and the like that are identical or similar to the structural elements, components, and the like explained in the first embodiment are assigned the same symbols, and explanations thereof may be omitted. 
     First Embodiment 
     A ventilation apparatus  100 A and a work jacket  200  according to the first embodiment will be explained, based on  FIG. 1  to  FIG. 11 . The ventilation apparatus  100 A is one example of a “ventilation apparatus” according to the present teachings, and the work jacket  200  is one example of a “garment” according to the present teachings. 
     Ventilation Apparatus 
     As shown in  FIG. 1 , the ventilation apparatus  100 A comprises a main body  110  that houses two ventilation units  120 . However, it is noted that the ventilation-apparatus-main-body  110  can also be configured to house more than two ventilation units  120  and can also be configured to house a single ventilation unit  120 . The main body  110  is one example of a “ventilation-apparatus-main-body” according to the present teachings. As shown in  FIG. 5 , each of the ventilation units  120  comprises a drive motor  121  and a fan  124 . The drive motor  121  is one example of a “motor” according to the present teachings, and the fan  124  is one example of a “fan” according to the present teachings. 
     As shown in  FIG. 5 , the drive motor  121  comprises a drive shaft  123 . The direction parallel to an output shaft of the drive shaft  123  defines an output-shaft direction  123 A. The direction orthogonal to the output-shaft direction  123 A defines an output-shaft orthogonal direction  123 B. 
     The output-shaft direction  123 A is disposed in a front-rear direction of a user in embodiments in which the ventilation apparatus  100 A is mounted on the work jacket  200  while the work jacket  200  is being worn by the user (refer to  FIGS. 7 and 9 ). The output-shaft direction  123 A is one example of an “output-shaft direction of a drive shaft” according to the present teachings. 
     As shown in  FIG. 2 , the main body  110  comprises a first main-body part  111  and a second main-body part  112 . As shown in  FIG. 2  and  FIG. 3 , intake ports  111 A are provided on the first main-body part  111 . As shown in  FIG. 2  and  FIG. 4 , exhaust ports  112 A are provided on the second main-body part  112 . The intake ports  111 A are one example of “intake ports” according to the present teachings, and the exhaust ports  112 A are one example of “exhaust ports” according to the present teachings. 
     As shown in  FIG. 2  and  FIG. 5 , the intake ports  111 A are provided in the output-shaft orthogonal direction  123 B of the first main-body part  111 . The exhaust ports  112 A are provided in the output-shaft direction  123 A of the second main-body part  112 . According to this configuration, even if the user leans against a wall and thereby the main body  110  makes contact with that wall, the main body  110  can efficiently take in air via the intake ports  111 A and deliver (output) that air via the exhaust ports  112 A. 
     It is noted that, as shown in  FIG. 2 , an electrical cable  130  for supplying electric current and drive signals to the drive motor  121  extends from the main body  110 . The electrical cable  130  is electrically connected with an operation part (handheld, manual controller)  140  (refer to  FIG. 7 ). 
     The drive motor  121  shown in  FIG. 5  is a brushless motor. Consequently, by making the drive motor  121  compact and high output, the main body  110  of the ventilation apparatus  100  can be made compact overall while ensuring suitable ventilation performance of the ventilation apparatus  100 A. Furthermore, the durability of the drive motor  121  can be improved, and it becomes easy to steplessly change the rotational speed. 
     The drive motor  121  comprises a main body  122  and a drive shaft  123 . The main body  122  of the drive motor  121  is one example of a “motor-main-body” according to the present teachings, and the drive shaft  123  is one example of a “drive shaft” according to the present teachings. 
     Although not illustrated for the sake of convenience, the main body  122  comprises a stator and a rotor. In addition, the drive motor  121  comprises switching elements, such as FETs, that are disposed adjacent to the main body  122 . The switching elements are controlled by a central processing unit  142 , which is described below. 
     As shown in  FIG. 5 , the fan  124  comprises a main body  125 , which is mounted on the drive shaft  123 , and blades  126 . The main body  125  of the fan  124  is one example of a “fan-main-body” according to the present teachings, and the blades  126  are one example of “blades” according to the present teachings. A plurality of the blades  126  is provided on the fan-main-body  125 . 
     As shown in  FIG. 6 , each blade  126  is provided such that it extends in a direction that intersects the output-shaft direction  123 A. In addition, as shown in  FIG. 1 , a first end  126 A and a second end  126 B are provided on opposite outer edges of each of the blades  126 . 
     As shown in  FIG. 6 , the main body  122  of the drive motor  121  is configured to be shorter than the blades  126  in the output-shaft direction  123 A. This configuration will now be explained in further detail, based on  FIG. 6 . That is, an intersection point of a line extending from the first end  126 A of the blade  126  in the output-shaft orthogonal direction  123 B and a line extending in the output-shaft direction  123 A is taken as a first end location  126 A 1  of the blade  126 . On the other side, an intersection point of a line extending from the second end  126 B of the blade  126  in the output-shaft orthogonal direction  123 B and a line extending in the output-shaft direction  123 A is taken as a second end location  126 B 1  of the blade  126 . The distance between the first end location  126 A 1  and the second end location  126 B 1  defines a first distance  126 L, i.e. the length of the blade  126  in the output-shaft direction  123 A. 
     In addition, an intersection point of a line extending from a first end  122 A of the drive-motor-main-body  122  in the output-shaft orthogonal direction  123 B and a line extending in the output-shaft direction  123 A is taken as a first end location  122 A 1  of the motor main body  122 . On the other side, an intersection point of a line extending from a second end  122 B of the drive-motor-main-body  122  in the output-shaft orthogonal direction  123 B and a line extending in the output-shaft direction  123 A is taken as a second end location  122 B 1  of the motor main body  122 . The distance between the first end location  122 A 1  and the second end location  122 B 1  defines a second distance  122 L, i.e. the length of the main body  122  of the drive motor  121  in the output-shaft direction  123 A. It is noted that the first end  122 A and the second end  122 B are defined by edges of the main body  122  that are spaced farthest apart in the output-shaft direction  123 A of the drive motor  121 . 
     Because the second distance  122 L is shorter than the first distance  126 L, it is possible to shorten the ventilation apparatus  100 A in the output-shaft direction  123 A. 
     The operation part (manual controller)  140 , which the user presses to input instructions to control the drive motor  121 , is shown in  FIG. 7 . The operation part  140  comprises operation buttons  141 A, which are disposed on a main body  141  of the operation part  140  and are manually operated (pressed) by the user. As shown in  FIG. 8 , signals generated by pressing the operation buttons  141 A are input to the central processing unit  142 . The central processing unit  142  is configured to drive the drive motor  121  in accordance with the user&#39;s instructions that are input by pressing the operation buttons  141 A. It is noted that the central processing unit  142  can be constituted by a microcomputer. As shown in  FIG. 7 , the main body  141  of the operation part  140  is configured (manufactured) separately from the ventilation-apparatus-main-body  110  and a battery-receiving part  170  (refer to  FIG. 9 ). Although not illustrated for the sake of convenience, the main body  141  may comprise a clip for fixing (attaching) the main body  141 , e.g., to a belt of the user. It is noted that the main body  141  can also be housed in a pocket, as will be explained further below, or attached to a garment other than a belt. 
     It is noted that the central processing unit  142  can be provided in the operation-main-body part  141 , in the ventilation-apparatus-main-body  110 , or on the electrical cable  130  ( FIG. 2  to  FIG. 5 ). 
     A battery  180  for driving the drive motor  121  is shown in  FIG. 9 . The battery  180  is configured to be mountable on and detachable from the battery-receiving part (battery mount or battery carrier)  170 . The battery-receiving part  170  has a clip  171 , which may be mounted on (attached to), e.g., the belt of the user. It is noted that, although not illustrated for the sake of convenience of the explanation, an electrical cable for transmitting electric current and drive signals to the drive motor  121  is provided and extends from the battery-receiving part  170  to the operation part  140 . 
     It is noted that the battery-receiving part (battery mount or battery carrier)  170  may be configured to mount a standard power tool battery  180  that can be used with other power tools or work jackets having a heating function. As a result, the user can economically utilize the ventilation apparatus  100 A, because it is not necessary to purchase a dedicated power supply. 
     As shown in  FIG. 9 , the main body  110  of the ventilation apparatus  110 A is mounted on the work jacket  200  such that the intake ports  111 A are disposed on the outside of the work jacket  200 , and the exhaust ports  112 A are disposed in an internal-space part  230  (refer to  FIG. 11 ) of the work jacket  200 . The configuration of the internal-space part  230  will be described below. As shown in  FIG. 9 , the main body  110  is configured to be mountable on and detachable from the work jacket  200  using a first engaging part  110 A and a second engaging part  110 B. The first engaging part  110 A comprises a fastener. The fastener may include one set of teeth provided around the ventilation-apparatus-main-body  110 , and another set of teeth provided on a ventilation-apparatus-opening  212  (refer to  FIG. 11 ) of the work jacket  200 ; e.g., the fastener may be a zipper. The second engaging part  110 B comprises a strap, which extends from the ventilation-apparatus-main-body  110 , and a snap, which engages such that it is mountable on and detachable from a prescribed area of the work jacket  200 . The ventilation apparatus  100 A and the work jacket  200  can be reliably engaged by the first engaging part  110 A and the second engaging part  110 B. 
     Work Jacket 
     As shown in  FIG. 7  and  FIG. 9 , an outer-side area  210  of the work jacket  200  is constituted by an exterior part (exterior shell)  210 A. The work jacket  200  comprises sleeves  211  for inserting the arms of the user. 
     The work jacket  200  has an inner-side area  220  (refer to  FIG. 10 ), which faces the user when the work jacket  200  is worn by the user. In the work jacket  200 , the inner-side area  220  is located on the opposite side of the outer-side area  210 . 
     As shown in  FIG. 9 , the ventilation apparatus  100 A is mounted on a rear-surface side of the work jacket  200 . To mount the ventilation apparatus  100 A, the ventilation-apparatus-opening  212  (refer to  FIG. 11 ) is provided on the rear-surface side of the work jacket  200 . 
     Internal-Space Part 
     The inner-side area  220  of the work jacket  200  is shown in  FIG. 10 . An interior part (interior shell)  220 A is provided in a prescribed area of the inner-side area  220 . The prescribed area of the inner-side area  220  includes an area that faces the back of the user. An outer-edge part of the interior part  220 A is connected with the exterior part  210 A, excepting the areas corresponding to the armpits and the neck of the user and the one portion corresponding to the ventilation apparatus  100 A. Ventilation openings  231  are formed in areas not in contact with the interior part  220 A and the exterior part  210 A. Fasteners  232  are provided on (along) the ventilation openings  231  in the areas corresponding to the armpits of the user. 
     As shown in  FIG. 11 , the area (volume) surrounded by the exterior part  210 A and the interior part  220 A constitutes the internal-space part  230 . The ventilation apparatus  100 A delivers air into the internal-space part  230 . When the temperature of the air inside the internal-space part  230  rises owing to the body temperature of the user, the air inside the internal-space part  230  can be cooled by the outside air taken in from the ventilation apparatus  100 A. It is noted that the volume of the internal-space part  230  expands when the air is supplied from the ventilation apparatus  100 A. 
     The air that accumulates in the internal-space part  230  flows out from the ventilation openings  231 . As shown in  FIG. 10 , the ventilation openings  231  are provided at locations corresponding to the neck, the armpits, and the hip of the user. That is, because the ventilation openings  231  are provided in areas at which the user tends to feel heat, the user can be efficiently cooled by the air from the ventilation openings  231 . It is noted that, by opening and closing the fasteners  232 , the cooling effect with respect to the armpits of the user can be adjusted. 
     The exterior part  210 A and the interior part  220 A are made from a low air permeable fabric to inhibit leakage of the air from the internal-space part  230  through the exterior part  210 A and the interior part  220 A. For example, the exterior part  210 A can be composed of natural fibers, such as cotton cloth, or a fabric made of synthetic-resin fibers, such as nylon. In addition, the interior part  220 A can be composed of said fabrics or a film body made of synthetic resin. The exterior part  210 A can be connected to the interior part  220 A by sewing, an adhesive, a fastener, or a hook-and-loop fastener. 
     Operation of the Ventilation Apparatus 
     As shown in  FIG. 9 , the ventilation apparatus  100 A is mounted on the work jacket  200  using the first engaging part  110 A and the second engaging part  110 B. When the ventilation apparatus  100 A is mounted on the work jacket  200 , as shown in  FIG. 11 , the first main-body part  111  is disposed on an outer side of the work jacket  200 , and the second main-body part  112  is disposed in the internal-space part  230 . As was noted above, because the drive motor  121  is a brushless motor in this embodiment, the ventilation apparatus  100 A can be made compact in the front-rear direction. That is, as shown in  FIG. 6 , because the main body  122  of the drive motor  121  is shorter than the blades  126  in the output-shaft direction  123 A, the ventilation apparatus  100 A can be shortened in the output-shaft direction  123 A. 
     Because the air from the ventilation apparatus  100 A flows out to the user via the internal-space part  230 , the user is cooled by that air. Thereby, the work jacket  200  can provide a more comfortable work environment for the user. 
     Second Embodiment 
     The configuration of a ventilation apparatus  100 B according to the second embodiment of the present teachings will be explained based on  FIG. 12 . The ventilation apparatus  100 B is configured such that additional structures are added to, and new functions are performed by, the ventilation apparatus  100 A of the first embodiment. 
     As shown in  FIG. 12 , the ventilation apparatus  100 B comprises a temperature sensor  143 , which is one example of a “temperature sensor” according to the present teachings. The central processing unit  142  is configured to control the rotational speed of the drive motor  121  based on temperature information from the temperature sensor  143 . That is, the central processing unit  142  acts as a temperature-based control part in this embodiment. 
     The temperature sensor  143  is configured (manufactured) separately from the ventilation-apparatus-main-body  110  and is electrically connected to the central processing unit  142 . The temperature sensor  143  can be mounted on the outer-side area  210 , the inner-side area  220 , or the internal-space part  230  of the work jacket  200  (refer to  FIG. 7  and  FIG. 9  to  FIG. 11 ). 
     According to this configuration, the ventilation apparatus  100 B can increase the rotational speed of the drive motor  121  when the temperature is high and can decrease the rotational speed of the drive motor  121  when the temperature is low. That is, the ventilation apparatus  100 B can adjust the airflow automatically based on the temperature information. 
     Third Embodiment 
     The configuration of a ventilation apparatus  100 C according to a third embodiment of the present teachings will be explained based on  FIG. 13 . The ventilation apparatus  100 C is configured such that additional structures are added to, and new functions are performed by, the ventilation apparatus  100 A of the first embodiment. 
     As shown in  FIG. 13 , the ventilation apparatus  100 C comprises a receiver  144 , which receives biological information of the user sent by a wearable computer  190 . The wearable computer  190  is one example of a “mobile computer” according to the present teachings, and the receiver  144  is one example of a “receiver” according to the present teachings. The central processing unit  142  is configured to control the rotational speed of the drive motor  121  in accordance with the biological information from the receiver  144 . That is, the central processing unit  142  acts as a biological-information-based control part in this embodiment. It is noted that the receiver  144  is disposed inside the ventilation-apparatus-main-body  110 . 
     The wearable computer  190  may be configured as a smart wristwatch that is worn on a wrist of the user, who has put on the work jacket  200 . A configuration is used such that the transmission of information between the wearable computer  190  and the receiver  144  is performed by wireless communication. In addition, among body temperature, heart rate, perspiration rate, and the like, one of or a combination of a plurality thereof can be given as examples of the biological information. As one example, the perspiration rate is used as the biological information in the ventilation apparatus  100 C. 
     According to this configuration, the ventilation apparatus  100 C can increase the rotational speed of the drive motor  121  when the perspiration rate of the user is high and can decrease the rotational speed of the drive motor  121  when the perspiration rate is low. That is, the ventilation apparatus  100 C can adjust the airflow automatically based on the biological information. 
     Fourth Embodiment 
     The configuration of a ventilation apparatus  100 D according to the fourth embodiment of the present teachings will be explained based on  FIG. 14 . The ventilation apparatus  100 D is configured such that additional structures are added to, and new functions are performed by, the ventilation apparatus  100 A of the first embodiment. 
     As shown in  FIG. 14 , the ventilation-apparatus-main-body  110  of the ventilation apparatus  100 D is configured such that it can house a filter  150  between the intake ports  111 A and the exhaust ports  112 A. The filter  150  is one example of a “filter” according to the present teachings. More specifically, the filter  150  is disposed such that it covers the intake ports  111 A. That is, the filter  150  is disposed in the interior of the ventilation apparatus  100 D. 
     A paper filter, a nonwoven fabric filter, a fabric filter, and a foam body filter can be given as examples of specific configurations of the filter  150 . In particular, a HEPA filter can be used to increase the filter efficiency. 
     Because a HEPA filter is configured with low air permeability compared with a typical paper filter, there is a problem in ensuring a sufficient airflow output from the ventilation apparatus  100 D. However, because each of the drive motors  121  of the ventilation apparatus  100 D is a brushless motor, the rotational speed of each drive motor  121  can be appropriately adjusted, and thereby it becomes possible for the ventilation apparatus  100 D to ensure a prescribed airflow, even if a HEPA filter is used. 
     Owing to the use of a filter  150  in this configuration, the ventilation apparatus  100 D can reduce the accumulation of dust in the interior of the ventilation-apparatus-main-body  110  and the blowing out of dust toward the user. 
     Fifth Embodiment 
     The configuration of a ventilation apparatus  100 E according to the fifth embodiment of the present teachings will be explained based on  FIG. 15 . With regard to the ventilation apparatus  100 E, the arrangement and shape of the filter  150  relative to the ventilation-apparatus-main-body  110  differs as compared to the ventilation apparatus  100 D of the fourth embodiment. 
     As shown in  FIG. 15 , the filter  150  is mounted on the exterior of the ventilation-apparatus-main-body  110  of the ventilation apparatus  100 E. More specifically, the filter  150  is mounted on the first main-body part  111  such that the filter  150  covers the intake ports  111 A. The filter  150  is formed in a bag shape having an opening; an elastic member, made of rubber or the like, is disposed along an opening-edge part. Thus, the filter  150  can be fixed to the ventilation-apparatus-main-body  110  by the contractive force of the elastic member. 
     Similar to the preceding embodiment, owing to the use of a filter  150  in this configuration, the ventilation apparatus  100 E can reduce the accumulation of dust in the interior of the ventilation-apparatus-main-body  110  and the blowing out of dust to the user. 
     Sixth Embodiment 
     The configuration of a ventilation apparatus  100 F according to the sixth embodiment of the present teachings will be explained based on  FIG. 16 . The ventilation apparatus  100 F is configured such that additional structures are added to, and new functions are performed by, the ventilation apparatus  100 D of the fourth embodiment. 
     As shown in  FIG. 16 , the ventilation apparatus  100 F comprises an electric-current detecting part  145  and a display  146 . The electric-current detecting part  145  is one example of a “filter-condition-detecting part” according to the present teachings. The electric-current detecting part  145  is configured to detect the magnitude of the electric current supplied to the drive motor  121 . In addition, the display  146  is constituted by an LED, which is disposed on the main body  141  of the operation part  140  (refer to  FIG. 7 ). 
     The central processing unit  142  detects the rotational speed of the drive motor  121  and information from the electric-current detecting part  145 . Furthermore, the central processing unit  142  is configured such that, if the electric-current value supplied to the drive motor  121  at a prescribed rotational speed of the drive motor  121  exceeds a threshold value, then it is determined that dust exceeding a prescribed amount has accumulated on the filter  150 , and the LED of the display  146  is turned ON. 
     According to this configuration, because the ventilation apparatus  100 F can display, using the display  146 , a notification that dust greater than the prescribed amount has accumulated on or in the filter  150 , it becomes possible for the user to easily ascertain the appropriate time to replace the filter  150 . 
     Seventh Embodiment 
     The configuration of a ventilation apparatus  100 G according to the seventh embodiment of the present teachings will be explained based on  FIG. 17 . The ventilation apparatus  100 G is configured such that additional structures are added to, and new functions are performed by, the ventilation apparatus  100 D of the fourth embodiment. 
     As shown in  FIG. 17 , the ventilation apparatus  100 G comprises a dust-removing part configured to remove, from the filter  150 , dust that has accumulated on the filter  150 . The dust-removing part comprises an elastic member  151 , which is disposed on an inner side of the filter  150 . The elastic member  151  is one example of a “dust-removing part” according to the present teachings. The elastic member  151  is formed of an air-permeable foam body and is disposed between the filter  150  and an elastic-member fixing rib (not shown). 
     According to this configuration, when the drive motors  121  are driven and the ventilation apparatus  100 G is suctioning air, the filter  150  sticks to the elastic member  151  owing to the airflow. Therefore, the elastic member  151  is compressed toward the interior. On the other hand, when the rotary drive of the drive motors  121  stops, the elastic member  151  restores to its original state, and thereby the filter  150  is abruptly moved outwardly. Owing to vibration (shaking) of the filter  150  generated at this time, dust is removed from the filter  150 . 
     That is, the ventilation apparatus  100 G makes it possible to automatically remove dust from the filter  150  when the drive motors  121  are stopped. Because the replacement frequency of the filter  150  can be reduced, the ventilation apparatus  100 G can be used in an economical manner. 
     Eighth Embodiment 
     The configuration of a ventilation apparatus  100 H according to the eighth embodiment of the present teachings will be explained based on  FIG. 18 . The ventilation apparatus  100 H is configured such that additional structures are added to, and new functions are performed by, the ventilation apparatus  100 E of the fifth embodiment. 
     As shown in  FIG. 18 , the ventilation apparatus  100 H comprises the dust-removing part, which is configured to remove, from the filter  150 , dust that has accumulated on the filter  150 . The dust-removing part comprises the elastic member  151 , which is disposed on the inner side of the filter  150 . The elastic member  151  is one example of a “dust-removing part” according to the present teachings. The elastic member  151  is formed of an air-permeable foam body and is disposed between the filter  150  and the ventilation-apparatus-main-body  110 . 
     According to this configuration, when the drive motors  121  are driven and the ventilation apparatus  100 G is suctioning air, the filter  150  sticks to the elastic member  151  owing the airflow. Therefore, the elastic member  151  is compressed toward the interior. On the other hand, when the rotary drive of the drive motors  121  stops, the elastic member  151  restores to its original state, and thereby the filter  150  is abruptly moved outwardly. Owing to the vibration (shaking) of the filter  150  generated at this time, the dust is removed from the filter  150 . 
     That is, the ventilation apparatus  100 H also makes it possible to automatically remove dust from the filter  150  when the drive motors  121  are stopped. Because the replacement frequency of the filter  150  can be reduced in this embodiment as well, the ventilation apparatus  100 H can be used in an economical manner. 
     Ninth Embodiment 
     The configuration of a ventilation apparatus  100 I according to the ninth embodiment of the present teachings will be explained based on  FIG. 19 . The ventilation apparatus  100 I is configured such that additional structures are added to, and new functions are performed by, the ventilation apparatus  100 F of the sixth embodiment. 
     As shown in  FIG. 19 , the ventilation apparatus  100 I comprises the filter-condition-detecting part, which is constituted by the electric-current detecting part  145 . 
     Similar to the sixth embodiment, the central processing unit  142  detects the rotational speed of the drive motor  121  and information from the electric-current detecting part  145 . Furthermore, the central processing unit  142  is configured such that, when the electric-current value supplied to the drive motor  121  at the prescribed rotational speed of the drive motor  121  exceeds the threshold value, it is determined that dust exceeding the prescribed amount has accumulated on the filter  150 . However, in this embodiment, when the prescribed dust threshold is exceeded, the drive motor(s)  121  is (are) caused to rotate in reverse. 
     According to this configuration, when it is determined that dust greater than the prescribed amount has accumulated on or in the filter  150  of the ventilation apparatus  100 I, the drive motor(s)  121  is (are) caused to rotate in reverse, and thereby air is caused to flow out in a direction that removes dust from the filter  150 . 
     That is, the ventilation apparatus  100 I also makes it possible to automatically remove dust from the filter  150  when dust greater than the prescribed amount has accumulated on the filter  150 . Because the replacement frequency of the filter  150  can be reduced, the ventilation apparatus  100 I can be used in an economical manner. 
     Tenth Embodiment 
     The configuration of a ventilation apparatus  100 J according to the tenth embodiment of the present teachings will be explained based on  FIG. 20 . The ventilation apparatus  100 J is configured such that additional structures are added to, and new functions are performed by, the ventilation apparatus  100 D of the fourth embodiment. 
     As shown in  FIG. 20 , the ventilation apparatus  100 J comprises a dust-removing part, which is configured to remove, from the filter  150 , dust that has accumulated on or in the filter  150 . In this embodiment, the dust-removing part comprises a reverse-operation part  141 B for causing the drive motor  121  to rotate in reverse. The reverse-operation part  141 B may include a button, which is disposed on the main body  141  of the operation part  140  (refer to  FIG. 7 ). The central processing unit  142  controls the drive motor  121 , in response to manipulation (e.g., pressing) of the reverse-operation part  141 B by the user, so as to cause the drive motor  121  to rotate in reverse. 
     According to this configuration, when the user determines that too much dust has accumulated on or in the filter  150  (e.g., because the airflow output from the ventilation apparatus  100 J has decreased), the user can operate (press) the reverse-operation part  141 B. By manipulating (pressing) the reverse-operation part  141 B, the rotational direction of the drive motor(s)  121  is reversed and air is caused to flow out in the direction that removes dust from the filter  150 . 
     That is, the ventilation apparatus  100 J makes it possible to automatically remove dust from the filter  150  by manipulating the reverse-operation part  141 B. Because the replacement frequency of the filter  150  can be reduced in this embodiment as well, the ventilation apparatus  100 J can be used in an economical manner. 
     Eleventh Embodiment 
     The configuration of a ventilation apparatus  100 K according to the eleventh embodiment of the present teachings will be explained based on  FIG. 21 . The ventilation apparatus  100 K is configured such that new structures are added to, and new functions are performed by, the ventilation apparatus  100 A of the first embodiment. As shown in  FIG. 21 , the ventilation apparatus  100 K comprises a Peltier element  160 . The Peltier element  160  is one example of a “Peltier element” according to the present teachings. 
     The Peltier element  160  is disposed between the two ventilation units  120  and is operated (powered) by the battery  180  (refer to  FIG. 9 ). If the ventilation apparatus  100 K is configured to blow air cooled by the Peltier element  160 , then a heat-absorbing surface (cooling surface) of the Peltier element  160  is facing the fan  124 . On the other hand, if the ventilation apparatus  100 K is configured to blow air heated by the Peltier element  160 , then a heat-generating surface of the Peltier element  160  is facing the fan  124 . 
     According to this configuration, the ventilation apparatus  100 K can blow out air, the temperature of which has been adjusted (increased or decreased) by the Peltier element  160 . 
     Twelfth Embodiment 
     The configuration of a ventilation apparatus  100 L according to the twelfth embodiment of the present teachings will be explained based on  FIG. 22 . With regard to the ventilation apparatus  100 L, the configuration of the operation part  140  differs as compared to the ventilation apparatus  100 A of the first embodiment. 
     As shown in  FIG. 22 , the operation part  140  of the ventilation apparatus  100 L is provided on the battery-receiving part  170 . In this embodiment, the central processing unit  142  also can be housed in the battery-receiving part  170 . 
     According to this configuration, because it is no longer necessary to separately provide the main body  141  of the operation part  140  that is connected via an electrical cable to the ventilation apparatus  100 L, the part count can be reduced and usability can be improved for the user. 
     Thirteenth Embodiment 
     The configuration of a ventilation apparatus  100 M according to the thirteenth embodiment of the present teachings will be explained based on  FIG. 23 . With regard to the ventilation apparatus  100 M, the configuration of the operation part  140  differs as compared to the ventilation apparatus  100 A of the first embodiment. 
     As shown in  FIG. 23 , the operation part  140  of the ventilation apparatus  100 M is provided on the work jacket  200 . That is, the main body  141  of the operation part  140  is mounted on (attached to) the work jacket  200 . In this embodiment, the central processing unit  142  can be housed in the main body  141 . 
     According to this configuration, because the operation part  140  can be provided on the ventilation apparatus  100 M at a location at which the user can easily check the operation part  140 , usability can be improved for the user. 
     Fourteenth Embodiment 
     A ventilation apparatus  100 N according to the fourteenth embodiment of the present teachings will be explained based on  FIG. 24  to  FIG. 28 . It is noted that, because most of the structures of the ventilation apparatus  100 N are the same as that of the ventilation apparatus  100 A of the first embodiment, the following mainly explains the structures of the ventilation apparatus  100 N that differ from the ventilation apparatus  100 A. 
     As shown in  FIG. 28 , the ventilation apparatus  100 N comprises the main body  110  and two of the ventilation units  120 , which are housed in the main body  110 . 
     As shown in  FIG. 24  and  FIG. 25 , the main body  110 , the same as in the first embodiment, is formed as a substantially elliptical-box-shaped housing overall and comprises the first main-body part  111  and the second main-body part  112 , which is mounted on the first main-body part  111  such that it can be mounted and detached in the output-shaft direction  123 A. While intake ports  111 E, which are for drawing air from the exterior into the ventilation-apparatus-main-body  110 , are provided on the first main-body part  111 , exhaust ports  112 A, which are for exhausting air from the ventilation-apparatus-main-body  110  to the exterior, are provided on the second main-body part  112 . In other words, the intake ports  111 E are provided on one side of the main body  110  in the output-shaft direction  123 A and the exhaust ports  112 A are provided on the other side of the main body  110 . 
     Unlike the first embodiment, however, each of the intake ports  111 E of the present embodiment comprises a first intake port  111 F, which is open in the output-shaft direction  123 A, and a second intake port  111 G which is open in a direction that intersects the drive shaft  123  (in the present embodiment, the output-shaft orthogonal direction  123 B). In greater detail, as shown in  FIG. 24  and  FIG. 28 , the first intake ports  111 F and the second intake ports  111 G are provided in a first wall  111 C and a second wall  111 D, respectively, of the first main-body part  111 . 
     The first wall  111 C is a portion of the first main-body part  111  that is disposed such that it is substantially orthogonal to the drive shafts  123  (in other words, such that it extends substantially in the output-shaft orthogonal direction  123 B). It is noted that, when the work jacket  200  (refer to  FIG. 9 ) on which the ventilation apparatus  100 N is mounted is worn by the user, the first wall part  111 C is disposed rearward of the user&#39;s back on an outer part of the exterior part  210 A and is the portion opposing the back. As shown in  FIG. 24  and  FIG. 26 , the first intake ports  111 F include a plurality of through holes formed in the first wall  111 C in two circular areas opposing the fans  124 . These through holes, i.e. the first intake ports  111 F, are open in the output-shaft direction  123 A (in greater detail, in the opposite direction of the second main-body part  112  in the output-shaft direction  123 A (in the opposite direction of the user&#39;s back)). Air passageways that pass through the first intake ports  111 F extend in the output-shaft direction  123 A. It is noted that the through holes that constitute the first intake ports  111 F should be open in the output-shaft direction  123 A, and their number, arrangement, locations, and the like are not limited to the illustrated example. 
     As shown in  FIG. 24 ,  FIG. 25 , and  FIG. 28 , the second wall  111 D is a circumferential-wall that extends from an outer circumference of the first wall  111 C toward the second main-body part  112  in the output-shaft direction  123 A. It is noted that, when the work jacket  200  (refer to  FIG. 9 ) on which the ventilation apparatus  100 N is mounted is worn by the user, the second wall  111 D is the portion that protrudes rearward from the user&#39;s back on an outer part of the exterior part  210 A. Each of the second intake ports  111 G includes a plurality of through holes formed in the second wall  111 D. These through holes, i.e. the second intake ports  111 G, are open (substantially parallel to the user&#39;s back) in a direction that intersects the drive shafts  123  (in the present embodiment, in the output-shaft orthogonal direction  123 B). The air passageways that pass through the second intake ports  111 G extend in the direction that intersects the drive shafts  123 . It is noted that the through holes that constitute the second intake ports  111 G should be open in the direction that intersects the drive shafts  123 , and their number, arrangement, locations, and the like are not limited to the illustrated example. 
     On the other hand, the exhaust ports  112 A, which are configured the same as in the first embodiment, are provided in the second main-body part  112 . In greater detail, as shown in  FIG. 25 ,  FIG. 27 , and  FIG. 28 , the second main-body part  112  is formed as circular-dome shapes, which protrude in the output-shaft direction  123 A away from the first main-body part  111 , and comprises two ventilation-unit-housing parts  112 B, which respectively house the ventilation units  120  in the interiors thereof. The exhaust ports  112 A include a plurality of through holes formed in the ventilation-unit-housing parts  112 B. These through holes, i.e. the exhaust ports  112 A, are open in the output-shaft direction  123 A (in detail, in the opposite direction of the first main-body part  111  in the output-shaft direction  123 A (in the direction of the user&#39;s back)). In the present embodiment, these through holes are also open in the direction that intersects the drive shafts  123 . It is noted that the through holes that constitute the exhaust ports  112 A should be open at least in the output-shaft direction  123 A, and their number, arrangement, locations, and the like are not limited to the illustrated example. 
     As shown in  FIG. 28 , each of the ventilation units  120  comprises the drive motor  121  and the fan  124 , the same as in the first embodiment. In the present embodiment, unlike the first embodiment, the length of each main body  122  of the drive motors  121  in the output-shaft direction  123 A is substantially the same as the length of the blades  126  of the fans  124 , or may be set slightly longer; however, it is shorter than a typical motor with brushes. In addition, in the present embodiment, the diameter of the fans  124  is 63 mm. 
     In the present embodiment, the operation part  140 , which is manually operated by the user, is provided on the battery-receiving part  170  (refer to  FIG. 22 ), the same as in the twelfth embodiment. In the present embodiment, each of the drive motors  121  is a so-called circuit-integrated-type brushless motor, and the central processing unit  142  (refer to  FIG. 8 ), together with a switching device, a rotor-position-detecting sensor, and the like, is installed on a circuit board (not shown) and built into each of the drive motors  121 . It is noted that, in the present embodiment, the electrical cable  130  (not shown in  FIG. 24  to  FIG. 28 ; refer to  FIGS. 2-4 ), which extends from the ventilation-apparatus-main-body  110 , is electrically connected to the battery-receiving part  170 . Signals generated by manipulating the operation part  140  provided on the battery-receiving part  170  are input to the central processing unit  142  via the electrical cable  130 . 
     As explained above, the intake ports  111 E, each of which comprises the first intake port  111 F open in the output-shaft direction  123 A of the drive shaft  123  and the second intake port  111 G open in the direction that intersects the drive shaft  123 , are provided on the ventilation apparatus  100 N of the present embodiment. Thereby, the ventilation apparatus  100 N can efficiently draw in air from different directions. Therefore, as in the ventilation apparatus  100 A of the first embodiment, compactness can be further achieved by reducing the thickness in the output-shaft direction while ensuring an aspirated airflow equivalent to embodiments in which only the intake ports  111 A are open in the direction that intersects the drive shaft  123 . 
     In addition, by using compact, high-output brushless motors as the drive motors  121 , shortening in the output-shaft direction  123 A is achieved and a reduction in the diameter of each fan  124  is also achieved. In a conventional ventilation apparatus in which a brushed motor is used, the diameter of the fan is typically 80 mm or more. On the other hand, in the present embodiment, the diameter of each fan  124  is reduced to 63 mm while airflow equivalent to such a conventional ventilation apparatus is ensured. Thus, the ventilation apparatus  100 N of the present embodiment achieves overall compactness. 
     Furthermore, in the present embodiment, because the operation part  140  is provided on the battery-receiving part  170 , it is not necessary to separately provide the main body  141  of the operation part  140 , and therefore the part count can be reduced, and usability can be improved for the user. In addition, by configuring the drive motors  121  as circuit-integrated-type brushless motors, it is not necessary to install the central processing unit  142  on or in another component, and therefore the part count can be reduced, and wiring can be simplified. 
     Ventilation apparatuses according to the present teachings are not limited to the configurations according to the first embodiment to the fourteenth embodiment described above. For example, the configurations described in the first embodiment to the fourteenth embodiment can be combined as appropriate. 
     In addition, for example, as in ventilation apparatuses  100 P shown in  FIG. 29 , a single ventilation unit  120  may be housed in each main body  110 . In such an embodiment, a plurality of the ventilation apparatuses  100 P may be mounted on the work jacket  200 . It is noted that, in  FIG. 29 , an example is illustrated in which two of the ventilation apparatuses  100 P are mounted. 
     In addition, it is also possible to provide new configurations for providing yet other functions. For example, it is possible to make the configurations such that a remaining-charge detecting part of the battery  180  is provided, the central processing unit  142  detects the remaining charge of the battery  180 , and the drive motor  121  rotates at a rotational speed in accordance with that remaining charge. According to this configuration, because the drive motor(s)  121  can be driven for a long time (e.g., 8 hours), it is possible to avoid the situation in which ventilation is unexpectedly stopped during work. 
     In addition, an ion-generating apparatus can be provided inside the ventilation-apparatus-main-body  110 . 
     (Correspondence Between Structural Elements of the Present Embodiment and Structural Elements of the Present Teachings) 
     The correspondence relationships between the structural elements of the embodiments described above and the structural elements of the present teachings are as follows. 
     The ventilation apparatuses  100 A,  100 B,  100 C,  100 D,  100 E,  100 F,  100 E  100 H,  100 I,  100 J,  100 K,  100 L,  100 M,  100 N,  100 P are each examples of the “ventilation apparatus” according to the present teachings. The work jacket  200  is one example of the “garment” according to the present teachings. The ventilation-apparatus-main-body  110  is one example of the “ventilation-apparatus-main-body” according to the present teachings. The drive motor  121  is one example of the “motor” according to the present teachings. The fan  124  is one example of the “fan” according to the present teachings. The intake ports  111 A,  111 E are one example of the “intake ports” according to the present teachings. The first intake ports  111 F and the second intake ports  111 G are one example of “first intake ports” and “second intake ports,” respectively, according to the present teachings. The exhaust ports  112 A are one example of the “exhaust ports” according to the present teachings. The drive-motor-main-body  122  is one example of the “motor-main-body” according to the present teachings. The drive shaft  123  is one example of the “drive shaft” according to the present teachings. The output-shaft direction  123 A is one example of the “output-shaft direction of the drive shaft” according to the present teachings. The fan-main-body  125  is one example of the “fan-main-body” according to the present teachings. Each blade  126  is one example of the “blade(s)” according to the present teachings. The central processing unit  142  is one example of each of the “temperature-based control part” and the “biological-information-based control part” according to the present teachings. The temperature sensor  143  is one example of the “temperature sensor” according to the present teachings. The wearable computer  190  is one example of the “mobile computer” according to the present teachings. The receiver  144  is one example of the “receiver” according to the present teachings. The filter  150  is one example of the “filter” according to the present teachings. The electric-current detecting part  145  is one example of the “filter-condition-detecting part” according to the present teachings. The display  146  is one example of a “display” according to the present teachings. The elastic member  151  and the reverse-operation part  141 B are each examples of the “dust-removing part” according to the present teachings. The Peltier element  160  is one example of the “Peltier element” according to the present teachings. 
     Considering the gist of the above-mentioned teachings, the aspects below are configurable in relation to the ventilation apparatus according to the present teachings. It is noted that these aspects are not only used independently or in combination but are also used in combination with the inventions described in the claims. 
     (First Aspect) 
     A temperature-based control part is constituted by a central processing unit, which controls the rotational speed of a drive motor. 
     (Second Aspect) 
     A biological-information-based control part is constituted by the central processing unit, which controls the rotational speed of the drive motor. 
     (Third Aspect) 
     A notifying part is provided that is configured to notify, based on information from the filter-condition-detecting part, the fact that dust greater than the prescribed amount has accumulated on the filter. 
     EXPLANATION OF THE REFERENCE NUMBERS 
     
         
           100 A,  100 B,  100 C,  100 D,  100 E,  100 F,  100 G  100 H,  100 I,  100 J,  100 K,  100 L,  100 L,  100 N Ventilation apparatus 
           110  Main body of the ventilation apparatus 
           110 A First engaging part 
           110 B Second engaging part 
           111  First main-body part 
           111 A,  111 E Intake ports 
           111 C First wall 
           111 D Second wall 
           111 F First intake port 
           111 G Second intake port 
           112  Second main-body part 
           112 A Exhaust port 
           112 B Ventilation-unit-housing part 
           120  Ventilation unit 
           121  Drive motor (motor) 
           122  Drive-motor-main-body 
           122 A First end of the motor 
           122 A 1  First end location of the motor 
           122 B Second end of the motor 
           122 B 1  Second end location of the motor 
           122 L Second distance 
           123  Drive shaft 
           123 A Output-shaft direction 
           123 B Output-shaft orthogonal direction 
           124  Fan 
           125  Fan-main-body 
           126  Blade 
           126 A First end of the blade 
           126 A 1  First end location of the blade 
           126 B Second end of the blade 
           126 B 1  Second end location of the blade 
           126 L First distance 
           130  Electrical cable 
           140  Operation part 
           141  Min-body of the operation part 
           141 A Operation button(s) 
           141 B Reverse-operation part 
           142  Central processing unit (controller) 
           143  Temperature sensor 
           144  Receiver 
           145  Electric-current detecting part 
           146  Display 
           150  Filter 
           151  Elastic member 
           160  Peltier element 
           170  Battery-receiving part 
           171  Clip 
           180  Battery 
           190  Wearable computer 
           200  Work jacket (garment) 
           210  Outer-side area 
           210 A Exterior part 
           211  Sleeve 
           212  Ventilation-apparatus-opening 
           220  Inner-side area 
           220 A Interior part 
           230  Internal-space part 
           231  Ventilation opening 
           232  Ventilation opening fastener