Spray valve atomizing assembly

Abstract

This utility model belongs to the field of spray valve technology, specifically relating to a spray valve atomizing component, including: a needle seat assembly and a spray cap. The needle seat assembly has an outlet for dispensing adhesive liquid. The spray cap is fitted over the needle seat assembly. A primary homogenizing airway and a secondary homogenizing airway are interconnected between the needle seat assembly and the spray cap. The primary homogenizing airway surrounds the upper end of the needle seat assembly, and the lower end of the spray cap has an atomizing port connected to the secondary homogenizing airway. The atomizing port surrounds the outlet and is coaxially arranged. This utility model constructs a two-stage airflow homogenization structure. The primary homogenizing airway initially homogenizes the gas, and the secondary homogenizing airway further homogenizes the airflow distribution, creating a uniform airflow field at the atomizing port. This ensures uniform gas dispersion and balanced air pressure, thereby enhancing the shearing effect on high-viscosity fluids and improving the uniformity of adhesive atomization.

Description

Technical Field

[0001] This utility model relates to the field of spray valve technology, and in particular to a spray valve atomization component. Background Technology

[0002] Two-phase flow spraying technology achieves fluid atomization through the interaction of gas and liquid two-phase flows. Due to its advantages such as high atomization efficiency and wide range of applicable fluids, it has become a core technology solution in fields such as industrial spraying and electronic packaging coating.

[0003] Traditional pneumatic spraying technology mainly relies on the impact force of gas on liquid to achieve atomization. In order to ensure the atomization effect, high-pressure gas is generally required for driving. However, in low-pressure conditions or high-viscosity fluid scenarios, there are problems such as high air consumption, significantly increased system energy consumption, and uneven liquid atomization. Utility Model Content

[0004] The technical problem solved by this invention is uneven liquid atomization.

[0005] Therefore, this utility model provides a spray valve atomizing component to improve atomization uniformity.

[0006] According to an embodiment of the present utility model, a spray valve atomizing component includes: a needle seat assembly, wherein the needle seat assembly is provided with a dispensing port for dispensing adhesive liquid;

[0007] A spray cap is fitted over the outside of the needle holder assembly and is tightly connected to the needle holder assembly. A primary homogenizing air channel and a secondary homogenizing air channel are formed between the needle holder assembly and the spray cap. The primary homogenizing air channel surrounds the upper end of the needle holder assembly, and the secondary homogenizing air channel surrounds the lower end of the needle holder assembly. The lower end of the spray cap has an atomizing port that communicates with the secondary homogenizing air channel. The atomizing port surrounds the dispensing port and is coaxially arranged.

[0008] The beneficial effects of this invention are that by constructing a two-stage airflow homogenization structure, the first-stage homogenization channel initially homogenizes the gas; the second-stage homogenization channel further homogenizes the airflow distribution, so that the gas forms a uniform airflow field at the atomization port, ensuring uniform gas dispersion and balanced air pressure, thereby enhancing the shearing effect on high-viscosity fluids and improving the uniformity of glue atomization. This staged homogenization design achieves a highly efficient atomization effect under low air consumption conditions by gradually optimizing the airflow distribution.

[0009] According to one embodiment of the present invention, the atomizing component further includes a homogenizing block, which is installed inside the spray cap and sleeved on the outside of the needle seat assembly, and is tightly connected to the needle seat assembly and the spray cap. The homogenizing block is provided with the primary homogenizing air channel.

[0010] According to one embodiment of the present invention, the primary homogenizing airway includes a plurality of primary air holes, which are evenly distributed along the circumference of the homogenizing block. Specifically, the primary homogenizing airway employs a circumferentially distributed porous structure to disperse the airflow path, reduce local airflow resistance, and maintain stable airflow output even under low-pressure conditions, thus avoiding atomization interruption or uneven local atomization due to insufficient pressure.

[0011] According to one embodiment of this utility model, the radial cross-section of each primary air vent is circular. Specifically, the circular structure of the primary air vent, without sharp edges, avoids the generation of eddies or turbulence at corners, allowing for smoother airflow and thus reducing air consumption.

[0012] According to one embodiment of the present invention, a plurality of protrusions are provided on the outer periphery of the upper end of the needle seat assembly, and the spray cap has a first mounting hole for mounting the upper end of the needle seat assembly. The outer wall of the protrusion is in close contact with the inner wall of the first mounting hole, and two adjacent protrusions and the inner wall of the first mounting hole form a slit air passage. The plurality of slit air passages constitute the primary homogenizing air passage.

[0013] According to one embodiment of this utility model, a second mounting hole for mounting the lower end of the needle seat assembly is provided inside the spray cap. The outer wall of the needle seat assembly is in close contact with the inner wall of the second mounting hole. Multiple arc-shaped grooves are provided inside the spray cap, each arc-shaped groove being recessed outward from the inner wall of the second mounting hole. The multiple arc-shaped grooves are evenly distributed around the circumference of the needle seat assembly, forming the secondary homogenizing airflow channel. Specifically, the secondary homogenizing airflow channel uses a circumferentially distributed arc-shaped groove structure to further refine the airflow distribution, enabling the gas to form a uniform airflow field at the atomization port.

[0014] According to one embodiment of this utility model, the spray cap is provided with a first homogenizing cavity and a second homogenizing cavity. The first homogenizing cavity is located between the primary homogenizing airway and the secondary homogenizing airway, and the inner wall surface of the first homogenizing cavity includes a first conical surface with a gradually decreasing inner diameter. The second homogenizing cavity is located between the secondary homogenizing airway and the atomizing port, and the inner wall surface of the second homogenizing cavity includes a second conical surface with a gradually decreasing inner diameter. Specifically, the first homogenizing cavity connects the primary and secondary homogenizing airways, and the gradually decreasing inner diameter of the first conical surface guides the airflow, guiding the gas smoothly into the secondary homogenizing airway. The second homogenizing cavity connects the secondary homogenizing airway and the atomizing port, and the gradually decreasing inner diameter of the second conical surface guides the airflow, guiding the gas smoothly into the atomizing port.

[0015] According to one embodiment of the present invention, the needle seat assembly has a liquid channel for liquid to pass through, and the glue outlet is connected to the lower end of the liquid channel.

[0016] According to one embodiment of this utility model, the needle holder assembly includes a needle holder and a needle, which are separate designs. The primary homogenizing air channel is arranged along the outer periphery of the needle holder, and the secondary homogenizing air channel is arranged along the outer periphery of the connection between the needle holder and the needle. The glue outlet is located at the lower end of the needle. Specifically, the separate design of the needle holder and the needle allows for the design of various glue outlet diameters. Only the needle needs to be replaced according to the spraying requirements, and only the needle needs to be machined. This reduces the cost, time, and difficulty of parts processing compared to an integrated structure.

[0017] According to one embodiment of this utility model, the dispensing port includes a sealing port located inside the needle and a spraying port located at the lower end of the needle, wherein the sealing port and the spraying port are connected by a turbulent flow channel. Specifically, the piston pin inside the spray valve is used to open or close the sealing port. After the adhesive flows out of the sealing port, it undergoes turbulence through the turbulent flow channel and is then sprayed out from the spraying port. The turbulent flow results in a more uniform flow velocity distribution of the sprayed adhesive, ensuring uniform atomization of the gas sprayed from the atomizing port, further improving the atomization effect and atomization uniformity.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the installation structure of the atomizing component and valve body in Example 1;

[0022] Figure 2 for Figure 1 Internal structure diagram;

[0023] Figure 3 for Figure 2 A sectional view at point A-A;

[0024] Figure 4 for Figure 2 A sectional view at point B-B;

[0025] Figure 5 for Figure 2 Enlarged view of the local structure at point E;

[0026] Figure 6 This is a schematic diagram of the homogenization block in Example 1;

[0027] Figure 7 This is a schematic diagram of the internal structure of the atomizing component and valve body installation in Example 2;

[0028] Figure 8 for Figure 7 A cross-sectional view at point C-C;

[0029] Figure 9 for Figure 7 A cross-sectional view at point D-D;

[0030] Figure 10 This is a schematic diagram of the atomizing component in Example 3;

[0031] Figure 11 for Figure 10 Internal structure diagram;

[0032] Figure 12 for Figure 11 Enlarged view of the local structure at point F.

[0033] In the diagram: 1. Needle seat assembly; 101. Liquid channel; 102. Dispensing port; 1021. Sealing port; 1022. Turbulent flow channel; 1023. Spray port; 103. Needle seat; 104. Needle; 105. Needle sealing gasket; 106. Leak-proof sealing gasket; 107. Through hole; 108. Protrusion; 109. Slit air passage; 2. Homogenizing block; 201. Primary homogenizing air passage; 3. Spray cap; 301. Atomizing port; 302. Secondary homogenizing air passage; 3021. Arc-shaped groove; 303. First homogenizing chamber; 304. Second homogenizing chamber; 305. Second mounting hole; 306. First mounting hole; 4. Secondary sealing gasket; 5. Valve body. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] like Figures 1 to 6 The image shows a preferred embodiment of the present invention. The atomizing component of the spray valve in this embodiment includes: a needle seat assembly 1 connected to the valve body 5, a liquid channel 101 provided in the needle seat assembly 1, and an adhesive outlet 102 communicating with the liquid channel 101 at the lower end of the needle seat assembly 1.

[0038] Homogenizing block 2 is sleeved on the outside of needle seat assembly 1 and tightly connected to needle seat assembly 1. A primary homogenizing air channel 201 is provided on homogenizing block 2.

[0039] The spray cap 3 is connected to the valve body 5. The spray cap 3 is sleeved on the outside of the homogenizing block 2 and the needle seat assembly 1 and is tightly connected to the homogenizing block 2 and the needle seat assembly 1. The lower end of the spray cap 3 is provided with an atomizing port 301, which is connected to the glue outlet 102. The spray cap 3 is provided with a secondary homogenizing air channel 302. The upper end of the secondary homogenizing air channel 302 is connected to the primary homogenizing air channel 201, and the lower end of the secondary homogenizing air channel 302 is connected to the atomizing port 301.

[0040] Specifically, the spray cap 3 is connected to the valve body 5 by a nut, so that the upper end face of the spray cap 3 is in direct contact with the lower end face of the valve body 5 to form a seal.

[0041] In this embodiment, a second mounting hole 305 is provided inside the spray cap 3 for mounting the needle seat assembly 1. The needle seat assembly 1 is tightly fitted with the second mounting hole 305, and the outer wall of the needle seat assembly 1 is in close contact with the inner wall of the second mounting hole 305 to prevent the needle seat assembly 1 from shaking. The secondary homogenizing air channel 302 is disposed on the inner wall of the second mounting hole 305. A first homogenizing cavity 303 is provided inside the spray cap 3. The first homogenizing cavity 303 is located above the second mounting hole 305 and is used to connect the primary homogenizing air channel 201 and the secondary homogenizing air channel 302. A second homogenizing cavity 304 is provided inside the spray cap 3. The second homogenizing cavity 304 is located below the second mounting hole 305 and is used to connect the secondary homogenizing air channel 302 and the atomizing port 301. During operation, gas enters through the air inlet in the valve body 5 and passes through the primary homogenizing air channel 201, the first homogenizing chamber 303, the secondary homogenizing air channel 302, and the second homogenizing chamber 304 in sequence before reaching the atomizing port 301. Liquid enters through the liquid channel 101 in the valve body 5 and passes through the liquid channel 101 in the needle seat assembly 1 and the glue outlet 102 in sequence before reaching the atomizing port 301. The gas impacts the glue at the atomizing port 301 (i.e., atomizes the glue).

[0042] Specifically, the aperture of the first homogenization chamber 303 is gradually reduced from the primary homogenization channel 201 to the secondary homogenization channel 302, so that the gas flows obliquely to the secondary homogenization channel 302 after passing through the primary homogenization channel 201, further reducing the airflow resistance.

[0043] See Figure 3 As shown, in this embodiment, the primary homogenizing airway 201 includes multiple primary air holes, which are evenly distributed along the circumference of the homogenizing block 2. Thus, the primary homogenizing airway 201 adopts a circumferentially distributed porous structure to disperse the airflow path, reduce local airflow resistance, and maintain a stable airflow output under low-pressure conditions, avoiding atomization interruption or uneven local atomization due to insufficient pressure.

[0044] In this embodiment, the radial cross-section of each primary air vent is circular. Therefore, the circular structure of the primary air vents, without sharp edges, avoids the generation of eddies or turbulence at corners, allowing for smoother airflow and thus reducing air consumption.

[0045] Specifically, there are eight primary pores, and the diameter of each primary pore is 1.5 mm.

[0046] See Figure 4As shown, in this embodiment, the secondary homogenizing airway 302 includes multiple arc-shaped grooves 3021, each arc-shaped groove 3021 being recessed outward from the inner wall of the second mounting hole 305, and the multiple arc-shaped grooves 3021 are evenly distributed around the needle seat assembly 1. Thus, the secondary homogenizing airway 302 uses a circumferentially distributed groove structure to further refine the airflow distribution, enabling the gas to form a uniform airflow field at the atomizing port 301.

[0047] Specifically, there are four arc-shaped grooves 3021. The four arc-shaped grooves 3021 are arranged in a ring array, which makes the secondary homogenization channel 302 have a petal-like structure.

[0048] In this embodiment, the radial cross-section of each arc-shaped groove 3021 has an arc-shaped structure. Therefore, while ensuring the smooth passage of the secondary airflow, the arc-shaped structure facilitates processing on the inner wall of the second mounting hole 305 of the spray cap 3.

[0049] In this embodiment, the upper end of the needle seat assembly 1 is threadedly connected to the valve body 5, and a secondary sealing gasket 4 is provided between the needle seat assembly 1 and the valve body 5. Thus, the threaded connection between the needle seat assembly 1 and the valve body 5 facilitates disassembly and assembly, and the secondary sealing gasket 4 between them prevents adhesive from entering the threads and solidifying, thus preventing disassembly.

[0050] In this embodiment, a first channel is provided in the needle seat assembly 1, and the firing pin is movably disposed in the first channel. A liquid channel 101 is formed between the outer wall of the firing pin and the first channel. The lower end of the firing pin can be operably blocked to seal the glue outlet 102. During operation, the firing pin can move along the first channel to open the glue outlet 102, and the glue is dispensed from the glue outlet 102 through the liquid channel 101.

[0051] In this embodiment, the needle seat assembly 1 includes a needle seat 103 and a needle 104. The needle seat 103 is connected to the valve body 5. The homogenizing block 2 is sleeved on the outside of the needle seat 103. The glue outlet 102 is located at the lower end of the needle 104. A needle sealing gasket 105 is provided between the needle seat 103 and the needle 104. Therefore, the needle holder 103 and the needle 104 adopt a split design. The diameter of the dispensing port 102 of the needle 104 can be designed to be of various specifications (e.g., the diameter of the dispensing port 102 is 0.1mm, 0.2mm, 0.3mm, etc.). Only the needle 104 needs to be replaced according to the spraying needs, and only the needle 104 needs to be processed. The processing cost, cycle and difficulty of the parts are lower than that of the integrated structure. Specifically, the needle 104 can also be made of different materials according to actual production needs (e.g., the needle 104 is a tungsten carbide needle or a ceramic needle, etc.). The direct contact and sealing between the two metal parts, the needle holder 103 and the needle 104, requires high precision. The needle sealing gasket 105 plays the role of sealing the needle holder 103 and the needle 104, reducing the precision requirements of the parts. Moreover, since the needle sealing gasket 105 has a certain degree of elasticity, it can ensure the sealing while allowing the upper end face of the spray cap 3 to directly contact and seal with the lower end face of the valve body 5.

[0052] In this embodiment, a leak-proof sealing gasket 106 is provided inside the needle holder 103. The leak-proof sealing gasket 106 is sleeved on the outside of the ejector pin. The leak-proof sealing gasket 106 has a through hole 107 for the ejector pin to pass through, and the ejector pin can operably block the opening of the through hole 107. Thus, the through hole 107 on the leak-proof sealing gasket 106 can ensure that the adhesive can flow smoothly to the outlet 102 when the spray valve is working normally. When the needle 104 needs to be replaced, the ejector pin can block the opening of the through hole 107 to prevent the adhesive in the valve body 5 from leaking from the needle holder 103 if the pressure of the feeding component is not released when the needle 104 is replaced.

[0053] Specifically, a conical surface is formed on the outer wall of the firing pin, and the orifice of the through hole 107 of the leak-proof sealing gasket 106 is provided with a chamfered inclined surface. When the needle 104 needs to be replaced, the firing pin moves downward under the drive of the valve body 5 until the conical surface and the chamfered inclined surface fit together to form a seal, preventing the adhesive from leaking from the through hole 107.

[0054] In this embodiment, the dispensing port 102 includes a sealing port 1021 located inside the needle 104 and a spray port 1023 located at the lower end of the needle 104. The sealing port 1021 and the spray port 1023 are connected by a turbulent flow channel 1022.

[0055] In this embodiment, see Figure 5As shown, the spray cap 3 is fitted over the needle 104. The length of the atomizing port 301 at the lower end of the spray cap 3 is greater than the length of the turbulent channel 1022 at the lower end of the needle 104. Therefore, the spray nozzle 1023 is located inside the atomizing port 301. This structure constitutes an internal atomization structure. In actual production, only the specifications of the spray cap 3 or the needle 104 need to be changed. By adjusting the length distance between the atomizing port 301 and the spray nozzle 1023, it is possible to adapt to the spraying of adhesives of different viscosities, thereby adjusting the spraying width.

[0056] The working principle of this embodiment is as follows:

[0057] Before operation, the upper end of the needle seat assembly 1 is threaded to the valve body 5, and the lower end of the needle seat assembly 1 extends into the second mounting hole 305 of the spray cap 3. The needle seat assembly 1 and the spray cap 3 are tightly fitted together. The homogenizing block 2 is sleeved on the outside of the upper end of the needle seat assembly 1 and installed inside the spray cap 3. The homogenizing block 2 is tightly fitted with both the spray cap 3 and the needle seat assembly 1. The spray cap 3 is then connected to the valve body 5 through a nut. The upper end face of the spray cap 3 is in direct contact with the lower end face of the valve body 5 for sealing.

[0058] During operation, gas enters through the air inlet in the valve body 5 and passes through the primary homogenizing air channel 201, the first homogenizing chamber 303, the secondary homogenizing air channel 302, and the second homogenizing chamber 304 in sequence before reaching the atomizing port 301. Liquid enters through the liquid inlet 101 in the valve body 5 and passes through the liquid channel 101 and the glue outlet 102 in the needle seat assembly 1 in sequence before reaching the atomizing port 301. The gas impacts the glue at the atomizing port 301 (i.e., atomizes the glue), and the atomized glue is sprayed out from the atomizing port 301.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention.

[0060] Based on the above, this utility model also has the following embodiments:

[0061] Example 2:

[0062] like Figures 7 to 9 As shown,

[0063] The difference from Example 1 is that:

[0064] Multiple protrusions 108 are provided on the outer periphery of the upper end of the needle holder assembly 1. The spray cap 3 has a first mounting hole 306 for mounting the upper end of the needle holder assembly 1. The outer wall of the protrusion 108 is in close contact with the inner wall of the first mounting hole 306 to prevent the needle holder assembly 1 from shaking in the first mounting hole 306. Two adjacent protrusions 108 and the inner wall of the first mounting hole 306 enclose each other to form a slit airway 109. Multiple slit airways 109 constitute a primary homogenizing airway 201.

[0065] Specifically, in this embodiment, there are six slit airways 109 and three arc-shaped grooves 3021.

[0066] Example 3:

[0067] The difference from Example 2 is that in this example, see... Figures 10 to 12 As shown, the spray cap 3 is sleeved on the outside of the needle 104. The length of the atomizing port 301 at the lower end of the spray cap 3 is less than the length of the turbulent channel 1022 at the lower end of the needle 104. Therefore, the spray port 1023 is located outside the atomizing port 301. This structure constitutes an external atomizing structure.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. A spray valve atomizing assembly characterized by, include: Needle holder assembly (1), wherein the needle holder assembly (1) is provided with a dispensing port (102) for dispensing adhesive liquid; A spray cap (3) is fitted over the outside of the needle seat assembly (1) and is tightly connected to the needle seat assembly (1). A primary homogenizing airway (201) and a secondary homogenizing airway (302) are formed between the needle seat assembly (1) and the spray cap (3). The primary homogenizing airway (201) surrounds the upper end of the needle seat assembly (1), and the secondary homogenizing airway (302) surrounds the lower end of the needle seat assembly (1). The lower end of the spray cap (3) is provided with an atomizing port (301) that communicates with the secondary homogenizing airway (302). The atomizing port (301) surrounds the dispensing port (102) and is coaxially arranged.

2. The spray valve atomizing assembly of claim 1 wherein, The atomizing component also includes a homogenizing block (2), which is installed inside the spray cap (3) and sleeved on the outside of the needle seat assembly (1), and is tightly connected to the needle seat assembly (1) and the spray cap (3). The homogenizing block (2) is provided with the primary homogenizing air channel (201).

3. The spray valve atomizing assembly of claim 2 wherein, The primary homogenizing air passage (201) includes a plurality of primary air holes, which are evenly distributed along the circumference of the homogenizing block (2).

4. The spray valve atomizing assembly of claim 3 wherein, Each of the primary pores has a circular radial cross-section.

5. The spray valve atomizing assembly of claim 1 wherein, The needle holder assembly (1) has a plurality of protrusions (108) on its outer periphery. The spray cap (3) has a first mounting hole (306) for mounting the upper end of the needle holder assembly (1). The outer wall of the protrusion (108) is in close contact with the inner wall of the first mounting hole (306). Two adjacent protrusions (108) and the inner wall of the first mounting hole (306) form a slit airway (109). The plurality of slit airways (109) constitute the primary homogenizing airway (201).

6. The spray valve atomizing assembly of claim 1 wherein, The spray cap (3) has a second mounting hole (305) for mounting the lower end of the needle seat assembly (1). The outer wall of the needle seat assembly (1) is in close contact with the inner wall of the second mounting hole (305). The spray cap (3) has a plurality of arc-shaped grooves (3021). Each arc-shaped groove (3021) is recessed outward from the inner wall of the second mounting hole (305). The plurality of arc-shaped grooves (3021) are evenly distributed around the needle seat assembly (1) in the circumference. The plurality of arc-shaped grooves (3021) constitute the secondary homogenizing air passage (302).

7. The spray valve atomizing assembly of claim 1 wherein, The spray cap (3) has a first homogenization chamber (303) and a second homogenization chamber (304) inside. The first homogenization chamber (303) is located between the primary homogenization air passage (201) and the secondary homogenization air passage (302). The inner wall surface of the first homogenization chamber (303) includes a first conical surface with a gradually decreasing inner diameter. The second homogenization chamber (304) is located between the secondary homogenization air passage (302) and the atomizing port (301). The inner wall surface of the second homogenization chamber (304) includes a second conical surface with a gradually decreasing inner diameter.

8. The spray valve atomizing assembly of claim 1 wherein, The needle holder assembly (1) has a liquid channel (101) for liquid to pass through, and the glue outlet (102) is connected to the lower end of the liquid channel (101).

9. The spray valve atomizing assembly of claim 1 wherein, The needle holder assembly (1) includes a needle holder (103) and a needle (104). The needle holder (103) and the needle (104) are designed separately. The primary homogenizing air channel (201) is arranged along the outer periphery of the needle holder (103). The secondary homogenizing air channel (302) is arranged along the outer periphery of the connection between the needle holder (103) and the needle (104). The glue outlet (102) is located at the lower end of the needle (104).

10. The spray valve atomizing assembly of claim 9 wherein, The dispensing port (102) includes a sealing port (1021) located inside the needle (104) and a spray port (1023) located at the lower end of the needle (104). The sealing port (1021) and the spray port (1023) are connected by a turbulent channel (1022).

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