Abstract:
A spin annular slit spray nozzle includes: a core seat, a spin core, and a spin annular slit orifice. Said core seat has a core chamber, an inlet and an outlet communicated with the core chamber are provided on the core seat; the inlet of the core seat is communicated with a pressurized flow source; said spin core is limited in the core chamber which is concentric with the spin core and may rotate with respect to each other; spin-actuating channels are formed on the spin core or on the core chamber wall. Due to the spin power from the spin-actuating channels, the spin core and the core chamber can rotate with respect to each other; a core head on the outer end of the spin core extends into the outlet of the core chamber; the spin annular slit orifice is form between the core head and the outlet end of the core chamber; the cross-section of the orifice is nearly a circular ring; the fineness and the flow of the pressurized mist of the spray nozzle are controlled respectively through adjusting the gap and diameter of the ring, and the distribution of the drop sizes is thus uniformly finer. A spray apparatus comprises said spin annular slit spray nozzle and the sprinkler body communicated with the spray nozzle core seat.

Description:
TECHNICAL FIELD 
       [0001]    The invention relates to a spray apparatus, and more particularly to a spin annular slit spray nozzle with ability of fineness control and a spray apparatus comprising the same, which belongs to the technical field of fire control and spraying. 
       BACKGROUND 
       [0002]    The spray head is an essential element for spraying, and the spraying quality has an essential influence on water mist fire suppression, wet dust removal, spray drying, and combustion performance of liquid fuel. 
         [0003]    The spray head has small round orifice(s) in general. At present, some spray heads with small round holes depend on the spin flow generated by the spin flow cores of rotors to spray; for example, Chinese Patent Application Nos. 01253101.4 and 200380103103.0 disclose a type of pressure spray heads with small round holes. The spray heads of this type cannot properly control spray fineness and the orifices are very small and cannot be made large. When other spray nozzle parameters are unchanged, the size of the spray drops can rapidly increase along with the increase of the diameter of the orifice, so that the spray quality deteriorates, which means the round orifice need to become smaller to spray finer mist. However, the spray flow is in direct proportion to the square of the hole diameter; at the same pressure, the smaller the hole is, the smaller the flow is, so that the spray concentration and density cannot meet requirements. Chinese Patent Application No. 200410012959.3 discloses a double-layer nozzle, which can increase spray flow and overcome the defect of small orifices. However, in order to uniformly and finely spray, the gap between the annular slits of the fixed double-layer nozzle must be made small and uniform. Such a fixed double-layer nozzle requires high mutual concentricity and high neutrality, is difficult to manufacture and is easily blocked. Thus, the filtering difficulty and manufacturing and application cost of the system are increased. 
         [0004]    The existing spray head with a rotary disk depends on a thin liquid film formed thereon by the centrifugal force of high-speed rotation to perform centrifugal spray. Although the rotary centrifugal spray head can finely spray, it has a hollow zone and cannot spray further. The periphery of the rotary disk of such a spray head is often provided with an annular air spray opening, such as a spray head shown in Chinese Patent Application No. 200410036938.5. However, the annular air spray opening is not used for spraying liquid but for spraying air so as to break the liquid film rotated out by the rotary disk. The spray head belongs to gas-liquid two-phase atomization, requires additional air source, and has a complicated structure. 
         [0005]    Many spray processes require high-quality spray, which require fine spray of the spray drops sprayed by the spray apparatus, and also require dense spray, high flow, good directivity of spray space distribution or wide space distribution, and good dispersivity. Some of the aims of fine spray are for flash evaporation. The evaporation rate is nearly in inverse proportion to the square of the spray drop diameter, namely the evaporation rate is accelerated about 100 times when the diameter is reduced to 1/10. Therefore, in the field of spray drying, water mist total flooding application for fire control, and oil spray combustion, rapid and massive evaporation is a key for increasing working efficiency. Thus, it is necessary to develop a high-flow superfine spray nozzle. However, the spray fineness of the existing nozzle is not uniform, the spray drop diameter is difficult to control, and particularly, the existing single nozzle cannot synchronously perform fine spray and high-flow spray. In addition, the water mist spray head for fire control is specially required to have a small volume, simple structure, and reliable operation. The existing spray head for fire control hardly meets the aforementioned comprehensive requirements, and particularly, it is more difficult to resolve the contradiction between the spray flow and fine spray. 
       SUMMARY 
       [0006]    In view of the above-described problems, it is one aim of the invention to provide a spin annular slit spray nozzle capable of spraying uniformly and finely and capable of spraying at high flow rate, and to give several spin annular slit spray nozzles with different structures for application at different occasions. 
         [0007]    Another aim of the invention is to provide a spray nozzle and a control method capable of simultaneously and easily controlling spray drops and spray flow, so as to resolve the difficulty of taking account of both spray flow and fine spray. 
         [0008]    To use and benefit from the advantages of the spin annular slit spray nozzle, and to expand and enhance spray space dispersivity, directivity, and other spray performance, the invention further gives a spray apparatus combined with the spin annular slit spray nozzle, so as to meet various spray process requirements, and strengthen the specific spray performance of the spray apparatus such as quick superfine spray evaporation, etc. 
         [0009]    The aim of the invention is also to provide a nozzle structure which is clog resistant and capable of self-cleaning, and the structure can be made into a self-closing dust-proof spray nozzle and spray apparatus so as to improve the quality and reliability of fine spray, and can be used for spraying single-fluid water mist and multi-phase flow superfine spray. 
         [0010]    The purpose of the invention is achieved by the following technical schemes. 
         [0011]    The invention relates to a spin annular slit spray nozzle, comprising a core seat, a spin core, and a spin annular slit orifice; wherein the core seat has a core chamber, an inlet and an outlet communicated with the core chamber are provided on the core seat, and the inlet of the core seat is communicated with a pressurized flow source; the spin core is limited and sheathed in the core chamber which is concentric with the spin core and rotates with respect to each other, spin-actuating channels are formed on the spin core or on the core chamber wall; the spin power from the spin-actuating channels make the spin core and the core chamber rotate with respect to each other, a core head on the outer end of the spin core extends into the outlet of the core chamber, the spin annular slit orifice is formed between the core head and the outlet end of the core chamber, the cross-section of the orifice is nearly a circular ring, the gap of the ring mainly decides the spray fineness, the diameter of the ring mainly decides the spray flow, and the fineness and flow required by the pressure spray of the spray nozzle can be obtained by respectively setting the gap and the diameter of the ring. 
         [0012]    The axial shape of the spin annular slit orifice is a short and round or conical tube-shaped annular slit, and an inlet gap of the annular slit orifice is not less than an outlet gap thereof. The annular slit orifice close to the outlet can be provided with a spray opening with the minimum annular slit gap. 
         [0013]    The spin core is in the shape of a stepped column; the peripheral surface of the spin core is provided an oblique or spiral tooth/groove-shaped spin-actuating channel, and the front end of the spin core is contracted into a small conical or small cylindrical core column head; the core column head penetrates into the outlet hole of the core seat and forms the spin annular slit orifice together with the outlet hole of the core seat, and the front end ring surface of the spin core, used as a rotary thrust limit surface, mutually slides with the front end wall of the core chamber. 
         [0014]    The output end ring surface of the spin core is uniformly distributed with at least two sections of wedge oblique surfaces or wedge ring surfaces; the opening angle of the wedge surfaces is 2 to 15°; the opening of the wedge surface faces the rotation direction of the spin core, and the wedge surfaces produce buoyance to the spin core during rotation so as to reduce friction. 
         [0015]    The spin core is provided with a center hole communicated with the inlet of the core chamber and extended to the outlet end of the spin core; the tube wall of the outlet end of the spin core is uniformly distributed with radial small holes and/or oblique small holes; the center hole of the spin core supplies pressure to the annular slit orifice through each small hole, to help the spin core suspend in the center and reduce friction. 
         [0016]    The peripheral surface of the core column head or the outlet hole wall of the core chamber is distributed with a short section of annular dense textures to enhance the turbulence fluctuation and fine spray effects of the rotary liquid film at the spray opening. 
         [0017]    The annular slit spray opening of the spray nozzle is sealed by the outer end of the spin core to prevent dust, and the inner end of the spin core is provided with elastic element(s) capable of internally pulling or externally pushing the spin core, so that the conical surface or cambered surface of the outer end of the spin core leans against the outlet hole wall of the core chamber; the elastic element is an elastic washer/gasket or spring whose weak elastic force does not disturb the hydraulic pressure spin spray of the annular slit spray opening and is favorable to atomization. 
         [0018]    The core seat is of combined type, a concentric subsidiary core seat is arranged in the core chamber of the core seat; the disk-shaped peripheral wall of the subsidiary core seat is provided with a spin flow groove/tooth-shaped spin-actuating channel; the spin core is positioned between the core chamber and the subsidiary core seat and uses a top center hole of the subsidiary core seat as a bearing hole to perform rotation and partial axial limit; the column head of the spin core concentrically penetrates into the contracted conical outlet hole of the core seat to form a reversed conical tube-shaped annular slit orifice. 
         [0019]    The spin core is of complex type; the spin core is provided with an outer core chamber and an inner core chamber which are communicated with the inlet of the core seat and concentric with each other; the outer core chamber wall is provided with outer spin flow passage(s); the inner core chamber is positioned at the center of the outer core chamber, and provided with an inner core element; the inner spray hole wall formed by contracting the inner core chamber inserts in the center of the outlet hole of the outer core chamber to form a spin annular slit orifice with a central spray hole, and the core seat or the core seat cover and the outer core chamber wall are provided with spin flow passage(s) used as spin-actuating channel(s) of the spin core. 
         [0020]    The spin-actuating channel(s) is arranged on the spin core and/or the core seat; the spin-actuating channels of the spin core can be oblique or spiral grooves/teeth/leaves; the spin-actuating channel(s) of the core seat is arranged on the wall of the core chamber or the close cover of the core seat and is a spin flow groove/hole. 
         [0021]    The spray fineness and flow are respectively controlled by the spin annular slit spray nozzle; the average spray drop diameter is controlled within the range of narrow size: if the average drop diameter required by spray fineness is T, suppose the hole diameter at the minimum gap of the annular slit spray opening is D and the diameter of the core column head at the minimum gap is d, (D−d)≦T×K, and K is a correlation coefficient of 1-3; the spray flow can be estimated by the formula Q=fΔPπDδ 3 /12 μL to determine the value of D and d, wherein f represents a coefficient (0.3&lt;f&lt;1) related to the spin flow rate of the spin annular slit and the eccentricity of the annular slit, ΔP represents a pressure difference, μ represents viscosity, D represents a hole diameter, L represents a hole length of annular slit, and δ represents an average slit width. 
         [0022]    A spray apparatus of the invention comprises a spray head body and a spray nozzle; the spray nozzle is arranged on the spray head body; the spray head body is provided with a spray head body chamber; its inlet end is connected with a pressurized flow source, and its outlet end is communicated with the spray nozzle; the spray nozzle comprises a spin annular slit spray nozzle. 
         [0023]    A spray apparatus of the invention: the spray head body is provided with a spray head body chamber of which each end is provided a central through hole, the spray head body is rotatably and fixedly sheathed on a steeped inlet tube connecting a pressurized flow source by its central through holes; a rotary sealing element is arranged between the spray head body and the inlet tube, and the wall of the inlet tube is provided with a hole/groove communicated with the spray head body chamber; the sealing head is used for sealing a lower through hole of the spray head body chamber and performing rotary thrust positioning for the spray head body, and the spray nozzle is arranged in the sealing head; the periphery of the spray head body is provided with a truncated cone or polyhedral cone body overlapped with a cross body, and the spray nozzles arranged on four side surfaces of the cross body opposite to the rotation direction produce equidirectional torque; each spray nozzle arranged on the spray head body is communicated with the spray head body chamber, comprising the spin annular slit spray nozzle. 
         [0024]    A spray apparatus of the invention, comprises: a joint, a spray head body, a core seat, spin core(s), and a spray head cover; the joint connected with a pressurized flow source is in threaded connection with an upper part of the spray head body; the spray head body is provided with a spin annular slit spray nozzle group comprising a core seat and at least three spin cores; at least three spin core chambers are arranged in the core seat; each spin core chamber is communicated with the joint inlet of the spray head body; each spin core chamber is rotatably and fixedly sheathed with a spin core to form a spin annular slit spray nozzle, and the outlets of all spray nozzles are gathered at the outlet of the core seat to spray; alternately, the outlet of the core seat is additionally provided with a Venturi tube-shaped spray head cover and the peripheral wall at the outlet of the core seat is provided with multiple suction holes; each suction hole is communicated with a mixing chamber between the outlet of the core seat and the spray head cover; the sprayed mist of each spray nozzle is mixed with air by the mixing chamber and foamily sprayed by the spray head cover. 
         [0025]    A spray apparatus of the invention comprises a spray head body, a core seat, and spin core(s). The core seat is rotatably arranged in the spray head body chamber; the spray head body chamber is provided with spin flow passage(s); the core seat is driven to rotate by the spin flow of the passage(s); the outlet end of the peripheral surface at the outlet of the core seat penetrates into the outlet hole of the spray head body chamber to form the spin large annular slit spray nozzle; the core seat is further provided with a spray nozzle comprising a spray nozzle with a spin core, namely a composite spin annular slit spray head is formed; the spray head body chamber is communicated with a pressurized flow source and each spray nozzle. 
         [0026]    The technical problems solved by and advantages of the invention are summarized below: 
         [0027]    1. Aiming at overcoming the defect of the existing mist spray head and solving the technical problem that the mutual contradictions between increasing spray head hole diameter and flow and increasing atomization degree are irreconcilable, the invention provides the technical scheme of using spin annular slit to spray. The diameter of such spin annular slit can be made large and the gap can be made very small. Thus, the sprayed mist is uniform and fine and the flow area and the spray flow are large, thereby solving the technical problem that it is difficult to take account of increasing spray flow and increasing atomization degree. The existing nozzle with a small round spray hole has the defect that the diameter of the small round spray hole must be small enough to ensure good atomization, so that its spray flow is greatly limited. However, the flow area of the annular slit spray opening is much larger than that of the spray opening with a small round hole having the same gap, the flow is nearly in direct proportion to the flow area. Thus, under the same gap and pressure difference condition, the spray flow of the annular slit spray opening is much higher than that of the spray opening with a small round hole. In addition, the annular slit gap for deciding spray fineness and the hole diameter for deciding flow can be respectively set independently as required. Thus, the spray fineness may be not controlled by flow, namely the annular slit and spray drop size can be small, while the annular slit hole diameter and flow can be large. 
         [0028]    2. The mist sprayed by the spin annular slit orifice has the obvious advantage of easier superfine spray than that sprayed by the existing orifice. The flow in the annular slit close to the movable round wall surface, and the flow close to the fixed round wall surface and the middle layer have different velocity gradient because of pressure and rotation, to form turbulence of high turbulence intensity with multi-direction components at different speed, so that the turbulence kinetic energy causing the liquid drops to be crushed for the second time after causing the liquid film jet to be smashed and divided is greatly increased, thereby accelerating superfine spray. The existing annular liquid film jet is atomized mainly depending on crushing caused by the fluctuation produced by friction disturbance between the outlet liquid ring and the air, while the spin annular slit orifice is provided with atomization factors for rotary centrifugal force growing film and high turbulence intensity fluctuation in addition to annular liquid film crushing mechanism, thereby greatly increasing its superfine spray capacity. 
         [0029]    3. The spin annular slit orifice of the invention has the advantages of fine spray, easy control of liquid drop size, and uniform distribution as compared to the existing small round spray orifice. The spray drop size of the existing small round spray orifice is difficult to control and the spray liquid drop size is not uniform; the invention uses the spin small gap of annular slit to greatly increase the once atomization uniformity of the spray opening, and controls the spray liquid drop size and distribution by setting the annular slit gap. 
         [0030]    4. The invention has the obvious advantage of being clog resistant. The existing fixed annular slit orifice is easy to be clogged because of small fixed gap, and the annular slit is in the rotation state when the spin annular slit orifice sprays. The core column head is moved relatively to the outlet hole wall of the core chamber, and has the functions of aligning during rotation, thereby preventing deviation and automatically cleaning obstructions. Therefore, even if the annular slit gap is very small, the spin annular slit spray opening is difficult to be blocked. 
         [0031]    5. The spin annular slit spray nozzle has the advantage of good dust-proof property. The nozzle structure can easily be made into dust-proof closed type, namely the spray opening is externally closed usually, so that it has good dust-proof property. Even if the spray nozzle structure is not made into the dust-proof closed type, the spin annular slit spray nozzle can prevent dust in general because the exposed gap of the spin annular slit spray nozzle is much smaller than that of the spray nozzle with a round hole of the same section area, which is favorable to dust prevention. 
         [0032]    6. The invention further has the obvious advantages of having a diverse structure and large size of the spin slit spray nozzle and the spray apparatus, thereby providing appropriate diverse spray equipment for different places. The time required for liquid drop evaporation is nearly in direct proportion to drop diameter square, so fine spray at high flow rate means spray evaporation rate is accelerated at large scale and square level. Therefore, when being used in the occasions of water mist fire control, spray drying, spray combustion and the like where spray flash evaporation is required, the invention can obviously increase gasification speed and working efficiency. 
         [0033]    The invention will further be described in detail in accordance with the figures and the specific embodiments. 
     
    
     
       BRIEF DESCRIPTION OF FIGURES 
         [0034]      FIG. 1-1  is a structure diagram of a spin core spray nozzle with a hollow column P 1 ; 
           [0035]      FIG. 1-1A  is a K view of  FIG. 1-1 ; 
           [0036]      FIG. 1-2  is a structure diagram of a spin core spray nozzle with a solid column P 2 ; 
           [0037]      FIG. 1-2A  is a sectional view of  FIG. 1-2  along a  0 - 0  line; 
           [0038]      FIG. 1-3  is a structure diagram of a multi-spin core spray nozzle with a shared core seat P 3 ; 
           [0039]      FIG. 1-4  is a structure diagram of a spray nozzle with a combined core seat P 4 ; 
           [0040]      FIG. 1-5  is a structure diagram of a spray nozzle with a composite spin core P 5 ; 
           [0041]      FIG. 1-6  is a structure diagram of a dust-proof spray nozzle with a conical core column head P 6 ; 
           [0042]      FIG. 1-7  is a structure diagram of a dust-proof spray nozzle with an arc core column head P 7 ; 
           [0043]      FIG. 1-7A  is a sectional view of  FIG. 1-7  along a T-T line; 
           [0044]      FIG. 2-1  is a structure diagram of an elevation half section of a total space spray head; 
           [0045]      FIG. 2-1A  is a sectional view of  FIG. 2-1  in a C-C direction; 
           [0046]      FIG. 2-2  is a top view of  FIG. 2-1  with local section; and 
           [0047]      FIG. 3  is a structure diagram of a spray gun/spray head. 
       
    
    
     DETAILED DESCRIPTION 
     1. Spin Annular Slit Spray Nozzle of the Invention. 
     Embodiment 1 
       [0048]    As shown in  FIG. 1-1 , a spin annular slit spray nozzle pl comprises a core seat  201 , a spin core  104 , a spin annular slit orifice  001 , and a core seat cover  103 . A core chamber  101  is arranged in the core seat  201 . The core seat  201  is provided with an inlet and an outlet communicated with the core chamber  101 , and the inlet of the core seat  201  is communicated with a pressurized flow source. The stepped cylindrical spin core  104  of which both ends are small and the middle is large employs the round hole  104  of the core chamber of the core seat and the round hole  102  of the core seat cover  103  to limit bearings at both ends and the three are concentric, and the spin core  104  is rotatably arranged in the stepped round hole core chamber  101  in a floating mode; the large column end of the spin core is contracted to a core column head  107  with a conical ring surface and a small column or small conical column, and the conical ring surface of the spin core  104  leans against the step in the contracted hole of the core chamber  101  to perform axial thrust positioning to the spin core  104 ; the periphery of the core column head  107  is provided with a smooth surface, the core column head  107  is positioned in the central round spray hole at the outlet of the core chamber  101  to form the annular slit orifice  010 ; the inlet gap of the annular slit orifice is larger than the outlet gap, and the approximate value of the outlet gap is (D−d)/2. The spin core  104  is provided with a center hole  100 ; the ring surface of the core column head  107  is provided with eccentric inclined holes  106  uniformly distributed; the conical ring surface is provided with a chute  108 ; the eccentric inclined holes  106  and the chute  108  are used as spin-actuating channels so that the spin core  104  is rotated, and then the spin annular slit spray nozzle is formed to be used for pressure spray. The small column or the small conical column of the core column head  107  is uniformly and symmetrically distributed with at least two pairs of small holes  105 ; both the eccentric inclined holes  106  and the small holes  105  are communicated with the center hole  100 , so that the spin core is aligned with the core seat  201  and the friction between the spin core and the core seat  201  is reduced. In this embodiment, the outlet section periphery of the core column head  107  can also be provided with a section of annular dense textures  010 , as shown in  FIG. 1-1A , so that the outlet of the annular slit orifice is formed into an inner round annular slit spray opening  001  with dense textures, or a short section of core with annular dense textures is arranged on the outlet hole wall of the core chamber, so that the turbulence fluctuation of the rotary liquid film at the spray opening and fine spray can be enhanced. 
         [0049]    The axial shape of the spin annular slit orifice is short and round or conical tube-shaped annular slit, and the annular slit orifice close to the outlet can be provided with a spray opening with the minimum annular slit gap. 
       Embodiment 2 
       [0050]      FIG. 1-2  shows a spin core spray nozzle p 2  with a solid column. The center of the core seat  202  is provided with a core chamber  123 ; a spin core  121  capable of floating and rotating is arranged in the round hole of the core chamber; the round hole of the core chamber is used for limiting the rotation of the spin core and concentric with the spin core. The front end of the outer-ring large column section of the spin core  121  is contracted into a small cylindrical or small conical core column head  127 . The core column head  127  is positioned in the reversed conical spray hole at the outlet of the core chamber to form an annular slit orifice  012 . The inlet gap of the annular slit orifice  012  is larger than its outlet gap, and the outlet of the annular slit orifice  012  is an annular slit spray opening  002 . The outlet of the guide groove  122  is arranged in the end ring surface  128  connecting the large column with the core column head  127  (as shown in  FIG. 1-2A ) and communicated with the annular slit orifice  012 . The end ring surface  128  leans against the round ring step outlet of contracted hole of the core chamber  123  to axially position the spin core  121 . The end ring surface  128  of the spin core  121  is uniformly and symmetrically distributed with wedge oblique surfaces  120 . The opening angle of the oblique surfaces is 2 to 15°, and the opening of the oblique surfaces faces the rotation direction of the spin core  121 . The periphery of the spin core  121  is provided with chute(s) or spiral groove(s)  122  which is used as a guide groove and used for providing rotation power. When the spin core  121  rotates, the oblique surfaces  120  or the ring section of oblique surfaces  120  can produce antifriction suspension force and perform pressure spray from the spin annular slit spray opening  002 . 
       Embodiment 3 
       [0051]      FIG. 1-3  shows a multi-spin core spray nozzle with a shared core seat P 3 , comprising: a seat body  135 , a core seat  203 , and spin cores  131 ,  130  and  111 . The core seat  203  is in screwed connection with the seat body  135 ; the core seat  203  is provided with at least three peripheral spin core chambers  133 , 138  and a central spin core chamber  139 , and the stepped cylindrical spin cores  131 ,  111  are rotatably sheathed in the spin core chambers  133 ,  138 . In the embodiment, the stepped cylindrical spin core  131  is in a stepped column shape whose both ends are small and the middle is provided with annular shoulders; the middle peripheral surface of the spin core  131  is provided with spiral tooth (teeth) or groove(s)  132  used as spin-actuating channels; the front end of the spin core  131  is contracted into a cylindrical core column head, and the core column head is inserted into the outlet of the spin core chamber  133  to form the annular slit orifice of which the inner annular slit gap is larger than the outer annular slit gap and its spray opening  003 ; the stepped cylindrical spin core  111  is in a stepped column shape of which both ends are small and the middle is provided with two sections of circular shoulders; the two sections of circular peripheral surfaces of the spin core  111  are respectively provided with a spiral groove  137  used as spin-actuating channels; the front end of the spin core  111  is contracted into a cylindrical core column head; the core column head is inserted into the outlet of the spin core cavity  138 , to form the annular slit orifice whose inner annular slit gap is larger than the outer annular slit gap and its annular slit spray opening  004 . Atomization core of other structure, such as fixed swirl vane  130 , can be sheathed in the spin core chamber  139 . The inner end surface penetrating into the seat body  135  in the core seat  203  is provided with guide grooves  134  communicated with the inlet of the seat body  135 . The number of the guide grooves is equal to that of the spin core chambers and the guide grooves are uniformly distributed by radiating from the center. Each guide groove is communicated with a hole of each spin core chamber. All spin core chamber arranged on the periphery of the core seat can use spin cores of the same shape. Spin cores of different shapes are used in this embodiment, only indicating that various structures can be used. 
       Embodiment 4 
       [0052]      FIG. 1-4  shows a spray nozzle with a combined core seat p 4 , comprising: a short screw-shaped core seat  204 , wherein a disk-shaped subsidiary core seat  146  and a spin core  105  are arranged in the hollow chamber  142 . The inlet of the core chamber is provided with a sealing cover  144 . The periphery of the sealing cover  144  is provided with guide through hole(s)  140 ; the bottom of the sealing cover  144  is provided with central blind hole(s), and a spin core tail column  143  is built in to limit rotary bearing(s) and upward stopping. The column core axle  145  of the spin core  105  uses the center hole of the disk-shaped subsidiary core seat  146  as a rotary bearing hole and limits downward stopping. The ring wall of the disk-shaped subsidiary core seat  146  is provided with at least two tangential spin flow through grooves  147 , and the ring wall is concentrically supported on the bottom wall of the core seat  204  and forms a spin flow chamber  149  together with the contracted conical hole of the core seat  204 . The surface of the spin core column in the spin flow chamber  149  is provided with a section of twill or knurling  148 ; the spin core  105  is provided with central blind hole(s) without pressure  024  so as to reduce the quality of the spin core. The spin core column head concentrically penetrates into the contracted conical outlet hole of the core seat  204 , to form the reversed conical tube-shaped annular slit orifice and its spray opening  004 . Fluid with pressure enters the core chamber  142  from the guide through hole  140  and then enters the spin flow chamber  149  after being rotated in the spin flow grooves  147 , and drives the spin core  105  to rotate in a floating mode, so that the pressure fluid is rotatably extruded and sprayed from the small spin annular slit orifice of the large outlet of the inner outlet. 
       Embodiment 5 
       [0053]      FIG. 1-5  shows a spray nozzle with a composite spin core p 5 , comprising a core seat cover  154 , a core seat  205 , a spin core  151 , an inner core element  152 , and a bearing  158 . The core seat cover  154  is in threaded connection with the core seat  205 ; a closed core seat chamber is formed between the core seat cover  154  and the core seat  205 , and the side wall of the core seat cover  154  is provided with tangential or oblique through hole(s)  155  used for providing spin flow into the core seat chamber. The spin core  151  is a composite element. The spin core is provided with an outer core chamber and an inner core chamber which are communicated with the core seat inlet and the core seat chamber and concentric with the chamber. A conical inner core chamber  150  is arranged at the center of the circular outer core chamber  156  of the spin core  151 . The inner core element  152  is fixedly inserted into an upper part of the inner core chamber  150 ; the inner core element  152  is provided with spiral groove(s)  159 ; the upper end of the inner core element  152  is provided with a tail column  153 , and the center hole in the inner top surface of the core seat  154  is used as a rotary bearing hole by the tail column  153 . The outer end of the ring chamber wall of the spin core  151  is provided with bearing  158 , and the bearing  158  is fixed in the outer ring groove of the bottom of the core seat  205 . The lower peripheral wall of the ring chamber wall of the spin core  151  is provided with at least two spin flow grooves  157 , and the core seat chamber is communicated with the outer core chamber by the spin flow grooves  157 . The lower part of the inner core chamber  150  is contracted to an inner spray opening  05 ; the hole wall of the inner spray opening  05  of the spin core is inserted into the outlet of the inner chamber of the core seat  205 , to form an outer circular seam spray opening  005 ; and the hole wall of the inner spray opening  05  is uniformly distributed with small holes; the outer circular seam spray opening  005  is communicated and aligned with the inner spray opening  05  by the small holes  032 . One path of pressure flow enters the outer circular seam spray opening  005  by the tangential hole  155  in the side wall of the core seat cover  154 , the tangential or oblique spin flow grooves  157  in the ring chamber wall of the spin core  151  after being rotated by the ring chamber, and the other path of pressure flow is sprayed from the inner spray opening  05  by the spiral groove  159  in the inner core column  152  after being rotated by the inner core chamber  150 . The spin core  151  is rotated in the same direction by setting the spin flow direction of the tangential or oblique through hole  155 , the spin flow grooves and the spiral groove  159 . The small holes  032  provide suspension alignment pressure for the circular seam spray hole. 
       Embodiment 6 
       [0054]      FIG. 1-6  shows a dust-proof spray nozzle p 6 . A subsidiary core seat  163  and a spin core  161  are arranged in a core chamber  168  of the core seat  206 . A column core axle  164  of the spin core  161  uses the center hole of the reverse cup-shaped subsidiary core seat  163  as a rotary bearing hole and limits downward stopping. The reversed cup-shaped ring opening of the subsidiary core seat  163  is supported and fixed into the lower wall of the core seat  206 ; the bottom of the spin core  161  is provided with an expanded conical core column head  170  concentrically matched with the expanded conical outlet hole to form the conical annular slit orifice; the inlet of the annular slit is large, and the outlet is small. When not work, the core column head  170  at its inner conical large diameter is pulled by a weak elastic element  169  and then leans against the inner wall of the expanded conical outlet hole of the core seat  206 , to seal the outlet hole of the core chamber so as to form a dust-proof ring surface  106 , so that the annular slit spray nozzle becomes a self-closing dust-proof spray nozzle. The weak elastic element  169  is an elastic gasket/washer or spring. It is positioned between a tail fixed nut  160  of the spin core  161  and a slip ring  162 , and the slip ring  162  sheathed on the core axle  164  is rotatably supported on the center hole plane of the subsidiary core seat  163 , as a thrust bearing element, and the slip ring  162  can be replaced by ball or rolling bearing. 
         [0055]    The periphery of the reversed cup-shaped ring wall of the subsidiary core seat  163  is provided with at least two tangential spin flow grooves  167 ; the column central section surface of the spin core  161  positioned in the flow core chamber  168  is provided with a section of twill or knurling to promote the spin flow to drive the spin core to rotate. The spin core is provided with a center hole  166 ; the periphery of the core column head inside the dust-proof ring surface  016  is uniformly distributed with at least four pairs of small holes  165 . Fluid with pressure enters from the hole of the spray head body and then enters the spin flow core chamber  168  through the spin flow grooves  167  to rotate, and drives the spin core  161  to rotate in a floating mode, so that the pressure fluid overcomes the dust-proof weak elastic force and is rotatably extruded and sprayed from the conical circular seam spray opening. Uniform superfine spray can be obtained because of the actions of elastic vibration and spin annular slit. 
       Embodiment 7 
       [0056]      FIG. 1-7  shows another dust-proof spray nozzle, which is provided with a core seat  207 ; the core seat  207  is threaded and fixed in the spray head body  172 ; the spin core  171  is rotatably arranged in the core chamber  178  and concentric with the core chamber  178 ; a spin limit surface is arranged between the spin core  171  and the core chamber  178 ; the core chamber  178  is provided with an inlet close cover  174 ; the wall of the core seat  207  around the close cover  174  is provided with at least two spin flow slots  177 , and the outlet hole of the core chamber is matched with the column head of the spin core  171  therein to form an annular slit orifice  007 . A weak spring  173  is arranged in the center hole of the spin core  171 ; the top ball or stepped column with snap head  175  of the weak spring  173  is slightly butted onto the bottom of the close cover  174  to axially limit the spin core  171  capable of rotating in a floating mode, and enables the tail end surface of the core column head of the spin core  171  to lean against the outlet end surface of the core chamber, to form an externally closed dust-proof surface  017 . When not in work, the outlet hole of the core chamber is sealed by the core column head via the weak elastic force of the weak spring  173  so as to prevent dust. The end wall of the spin core  171  inside the dust-proof surface  017  is symmetrically and uniformly distributed with suspension pairs of small holes  176  to help the spin core be suspended and aligned. The periphery of the spin core  171  is provided with section or two sections of discontinuous cylindrical rotary locating surfaces on which spiral grooves/teeth can be arranged. When flow with pressure enters the core chamber, spin flow dynamic pressure and suspending power can be caused, so that the spin core  171  leaves the dust-proof surface  017  and begins to rotate and performs rotary pressure spray via the circular seam spray hole  007 . 
       Embodiments 
     2. Spray Apparatus of the Invention 
     Embodiment 1 
       [0057]    As shown in  FIG. 2-1  and  FIG. 2-2 , a total space spray head is provided with a spray head body  7 , an inlet tube  2 , and multiple spray nozzles PX, wherein the PX are spin annular slit spray nozzles of appropriate types; the spray head body  7  is provided with a spray head body chamber  6 ; both ends of the spray head body chamber are respectively provided with a coaxial central through hole (the upper hole is small, and the lower hole is large), and the spray head body  7  is rotatably sheathed on the steeped inlet tube  2  connected with the pressurized flow source through the central through holes; the wall of the inlet tube  2  is provided with through hole(s) or through groove(s)  11  communicated with the spray head body chamber  6 , and each spray nozzle PX is arranged on the spray head body and communicated with the spray head body chamber  6 ; a rotary sealing element  9  is arranged between the upper central through hole  3  of the spray head body chamber  6  and the inlet tube  2 , and the lower central through hole of the spray head body chamber  6  is sealed by the sealing head formed by the hollow screw-shaped core seat  208 ; the inner-end ring surface  245  of the sealing head becomes the upper thrust surface for the rotation of the spray head body, and the lower thrust surface for the rotation of the spray head body is a ring surface  246 . The bottom of the core seat  208  is provided with a spray nozzle P 8 ; the spray nozzle P 8  is similar to the spin annular slit spray nozzle with a composite core seat p 4  (see embodiment 4 for spin annular slit spray nozzle) as shown in  FIG. 1-4 , and is different from p 4  in that the core cap  242  of P 8  is arranged at the outlet end of the inlet tube  2 , and is also different from p 4  in that the spin core  108  of P 8  is provided with an externally closed core hole  022 , the periphery of the core column head  020  is uniformly distributed with at least four small alignment holes  021  communicated with the core hole  022 . 
         [0058]    The spray head body  7  is in a shape of a composite body of peripheral cross body with a truncated cone or polyhedral cone body. The periphery of the truncated cone body  5  or the polyhedral cone body is provided with spray nozzles such as P 9 , Pg, and Pg is a fixed spray nozzle with a spray opening. Four side surfaces in the opposite rotation direction of the four support arms of the cross body are provided with spray nozzles such as P 11  or Pg, and all the end surfaces of the four support arms are provided with spray nozzles such as P 7 , P 10 . Preferably, there is an eccentric distance between the axis of P 7 , P 10  and the axis of the spray head body. Sprayed mist of each spray nozzle on the cross body of the spray head body produces rotary driving force in the same direction to the spray head body. All spray nozzles are internally provided with spin flow passages, the spray nozzles P 9 , P 11 , and Pg are not provided with core covers and directly penetrate into the spray head body chamber  6 , wherein the guide hole  8  used in the wall of the spray head body chamber and the spin flow passage  210  in the core seat  209  of the spray nozzle P 9  are communicated with the spin core  109  (see  FIG. 2-1A ); preferably, the through holes or through grooves  11  arranged in the tube wall of the inlet tube of the spray apparatus are consonant in an oblique direction so that the spin flow generated by the through holes or through grooves in the spray head body chamber can drive the spray head body to rotate, and the rotation direction is consonant with that of the rotary driving force generated by the sprayed mist of the spray nozzle to the spray head body. 
         [0059]    The spray head body  7  in the embodiment can be in other shape; the inlet tube  2  can be shortened to the result that the upper central through hole  3  of the spray head body chamber  6  is used as a bearing hole, and a filter  10  can be arranged in the inlet tube  2 . 
         [0060]    All the spray nozzles arranged on the spray head body  7  in the embodiment can use self-closing dust-proof spray nozzles of P 7  type, and the spray head becomes dust-proof spin annular slit spray head. 
       Embodiment 2 
       [0061]    As shown in  FIG. 3 , a spray gun/head used for foam spraying, mainly comprises a spray head body  15 , a joint  16 , at least three spin annular slit spray nozzles P 12  arranged on the core seat  213 , and a spray gun cover  18 . The core seat  213  is in threaded connection with the spray head body  15  and communicated with the pressurized flow source via the joint  16 . At least three steeped round hole-shaped core chamber in which spin cores  112 ,  116 ,  115  and the like can be arranged are uniformly distributed in the core seat  213 . The spin flow passage(s) capable of driving the spin core to rotate is arranged on the large column section of the spin core, and the large column section is rotatably matched with the round hole of the core chamber. The large column section can be arranged on the front section of the spin core, such as the spin core  112 , or arranged on both ends of the spin core, such as the spin core  116 , or arranged on the whole section of the spin core, such as the spin core  115 . The spin flow passage(s) can be arranged in the chute of the large column section of the spin core, such as the spin core  116 , or arranged in the spiral groove, such as the spin core  112 , or arranged in the screw thread, such as the spin core  115 . The diameter-shortened end column  113  of the spin core  112  exposes the core chamber hole and performs axial afterward limit near the bottom wall of the spray head body chamber  14 . The diameter-shortened core column head of the spin core  112  is positioned in the diameter-shortened hole of the stepped hole of the core chamber to form the annular slit spray hole  003 . The inlet gap of the annular slit spray hole  003  is larger than its outlet gap. The spray hole axes with the same axis opening of the inlet and outlet obliquely intersect on the central line of the core seat  213 , and the intersection angle is 0-30°. The outlet end wall of the core seat  213  is provided with two circles of multiple suction through holes  230 . The outlet of the core seat  213  is connected with the spray head cover  18 . The gathered sprayed mist of each annular slit spray hole  003  flows to the funnel-shaped confluence opening for collection. The confluence opening  19  is connected with a short larynx hole  019  of the inner ring groove and the external diffusion hole  030 , to form a Venturi air foam spray injection structure. The gas-water mist mixing chamber is formed by the core seat  213  and the butting chamber of the spray head cover  18 , and the diffusion hole  030  is also provided with a thin foam screen additionally. 
       Embodiment 3 
       [0062]    In the above embodiment, if the spray head cover  023  is removed, and the suction through holes  230  in the outlet end wall of the core seat  213  are also removed, the spray head body is in threaded connection with the core seat  213  to form a rotor type spin annular slit spray gun or spray head; alternately, such a combined spray nozzle with multiple spin cores shown in  FIG. 1-3  can be used as a spray gun or spray head as long as the seat body  135  of the spray nozzle is used as a spray head body and is connected to a pressurized flow source. 
       Embodiment 4 
       [0063]    As shown in  FIG. 1-6 , if the spin core  161 , the core seat  206 , and the subsidiary core seat  163  in embodiment 6 are used as the core seat, the spray head body, and the core seat bracket of the spray apparatus with a similar structure, and the spin core  161  is additionally provided with a small spin annular slit spray nozzle or spray nozzle of other type (not shown in the figure) communicated with the center hole  166 , thus a composite spin annular slit spray head is formed; the spray head comprises a spray head body, a core seat, and a spin core; the core seat is rotatably arranged in the spray head body chamber, the core seat bracket of the spray head body chamber is provided with spin flow passage(s) and/or the peripheral wall of the core seat is provided with groove/tooth/leaf-shaped passage(s) capable of being driven to rotate by the fluid, and the core seat is driven to rotate by the spin flow of the passage(s). The outlet end of the peripheral surface at the outlet of the core seat penetrates into the outlet hole of the spray head body chamber to form the spin annular slit spray nozzle. The center and/or periphery of the spin core seat is provided with spray nozzles comprising spray nozzles with spin cores, and the spray head body chamber is communicated with the pressurized flow source and each spray nozzle. Therefore, the core seat becomes mother spin core, and the spin core arranged on the core seat becomes child spin core to form the composite spin annular slit spray head with a spin large annular slit spray nozzle in which a spray nozzle is arranged; the composite spin annular slit spray head can form a complicated composite spin spray with both revolution and spin. 
         [0064]    Such a composite rotary spray of the spin annular slit spray nozzle/head can cause violent air agitation, intensify the friction and collision between spray drops and air, promote fine spray, greatly increase specific surface area of spray drops, favor to the complete mixing of the spray drops with air to accelerate flash evaporation of transmission media and transmission heat or accelerate the mixing and reaction with other media, thereby obviously increasing spray operation and technology efficiency. 
         [0065]    The spray apparatus with a spin annular slit spray nozzle can be formed as long as the spin annular slit spray nozzle of the invention is arranged on the spray head body or the core seat of the spin annular slit spray nozzle is connected with the spray head body, and then the spray head body is communicated with a pressurized flow source. 
         [0066]    The invention is described in detail in accordance with the above contents with several embodiments. However, this invention is not limited to the specific embodiments because the structures of spin core, core seat, core chamber, and spray head body are various, and the spin annular slit atomizing apparatuses combined by the spin core, the core seat, the core chamber, and the spray head are various, namely the equivalent changes and equivalent modifications which are made by using the application scope and the contents of specification of the invention should be considered to belong to the protection scope of the invention.