A two-fluid atomizing spray gun nozzle and a two-fluid spray device

Abstract

The utility model relates to a kind of two-fluid atomization spray gun nozzle and two-fluid spray device, and the two-fluid atomization spray gun nozzle the two-fluid atomization spray gun nozzle includes spray gun main body (6), nozzle (4);The nozzle (4) is located in the side of spray gun main body (6), the nozzle (4) is spray gun outlet, for making material form small droplet;The side of the spray gun main body (6) is equipped with outlet section (6-1);The nozzle (4) includes outlet section (6-1), nozzle outlet (4-2);The outlet section (6-1) is connected with nozzle outlet (4-2).Two-fluid spray device includes two-fluid atomization spray gun nozzle.Compared with prior art, the utility model can effectively control the atomization effect of material in drying chamber, reduce the phenomenon of material agglomeration in drying process, obtain the product with good particle morphology and relatively uniform particle size, and is used for diaphragm coating.

Description

Technical Field

[0001] This utility model relates to the field of spray device technology, and in particular to a two-fluid atomizing spray gun nozzle and a two-fluid spray device. Background Technology

[0002] Two-fluid spraying is a technology that uses gas or liquid to accelerate liquid raw materials and refine them into fine particles through micro-nozzles. In simpler terms, it involves breaking liquid substances into uniform, tiny particles under the impact of high-speed gas.

[0003] Two-fluid atomization technology generally consists of two parts: the first is the acceleration of the gas-fluid mixture, and the second is the nozzle design and the separation of the liquid substance. Typically, gas enters the nozzle through small holes or slits, mixes with the liquid substance inside, and is then sprayed out through a micro-nozzle. The atomized material is evaporated by hot air in a drying chamber to remove the solvent (residual solvent). As a key component of the two-fluid atomizer's atomization system, the nozzle's structural design directly affects the atomization effect, its lifespan, and its applicability. Although many factors influence the atomization effect of a two-fluid atomizer, the most important is the rationality of the nozzle's structural design. Polyvinylidene fluoride (PVDF) is a highly stable thermoplastic fluoropolymer, often used as a coating for lithium-ion battery separators. Coating the separator with PVDF forms a protective layer, improving its high-temperature resistance, increasing electrolyte retention, and enhancing battery safety under high pressure. This coating also improves the separator's porosity and puncture resistance, further enhancing the overall battery performance. For PVDF used in diaphragm coating, particle size is a very important parameter. How to obtain products with good particle morphology and relatively uniform particle size through two-fluid atomization for use in diaphragm coating is an urgent problem to be solved. Utility Model Content

[0004] The purpose of this invention is to overcome the defects of the prior art by providing a two-fluid atomizing spray gun nozzle and a two-fluid spraying device. Through the structure of the nozzle, the atomization effect of the material in the drying chamber can be effectively controlled, the agglomeration of the material during the drying process can be reduced, and a product with good particle morphology and relatively uniform particle size can be obtained for use in diaphragm coating.

[0005] The objective of this utility model can be achieved through the following technical solutions: The first objective of this invention is to provide a two-fluid atomizing spray gun nozzle, which includes a spray gun body and a nozzle; the nozzle is located on one side of the spray gun body and serves as the spray gun outlet for forming small droplets from the material; an outlet section is provided on one side of the spray gun body; the nozzle includes a nozzle outlet; and the outlet section is connected to the nozzle outlet.

[0006] Furthermore, the two-fluid atomizing spray gun nozzle also includes an air and liquid mixing chamber; the air and liquid mixing chamber is located inside the spray gun body; the air and liquid mixing chamber is connected to the outlet section; the air and liquid mixing chamber is used for mixing air and liquid.

[0007] Furthermore, the nozzle of the two-fluid atomizing spray gun also includes an impact rudder; the impact rudder is disposed in the air and liquid mixing chamber; the impact rudder is connected to the wall of the air and liquid mixing chamber; the impact rudder is used to cause the air and liquid to collide and generate friction and shear forces.

[0008] Furthermore, the working principle of the impact rudder is as follows: When air and liquid flow within the mixing chamber, the impact rudder, positioned within the chamber and connected to the wall, obstructs the flow path of the air and liquid. As the air and liquid flow past the impact rudder, they collide with it, causing relative motion between the air and liquid, and between them and the impact rudder. This relative motion generates friction. Simultaneously, the impact alters the fluid flow state, causing interaction between fluids of different velocities and directions, thereby generating shear force.

[0009] Furthermore, the two-fluid atomizing spray gun nozzle also includes a liquid inlet; the liquid inlet is connected to the air and liquid mixing chamber; the liquid inlet is used to inject liquid material; the liquid inlet, nozzle, outlet section, and air and liquid mixing chamber are coaxially arranged.

[0010] Furthermore, the two-fluid atomizing spray gun nozzle also includes an air inlet; the air inlet is connected to the air and liquid mixing chamber; the air inlet is used to inject air; the axis of the air inlet is perpendicular to the axis of the liquid inlet.

[0011] Furthermore, the nozzle also includes a partition plate and a nozzle head end; the two ends of the partition plate are respectively connected to the wall of the outlet section and the nozzle head end.

[0012] Furthermore, the outlet section and the nozzle head end are coaxially arranged, and the size of the nozzle head end plane is smaller than the size of the outlet surface of the outlet section.

[0013] Furthermore, multiple partition plates are set; the multiple partition plates are arranged in a circular array; adjacent spray partition plates are spaced apart to form nozzle outlets.

[0014] More preferably, three partition plates are provided; the three partition plates are evenly arranged in a circular array; adjacent partition plates are spaced apart to form nozzle outlets, and the three partition plates are spaced apart to form three nozzle outlets of the same size.

[0015] Furthermore, the partition plate is inclined; the end face of the nozzle head protrudes relative to the end face of the outlet section.

[0016] The second objective of this invention is to provide a two-fluid spraying device, which includes the aforementioned two-fluid atomizing spray gun nozzle.

[0017] Furthermore, the two-fluid spraying device includes a drying chamber, an air regulating valve, a screw pump, and a fan; the drying chamber is connected to the nozzle of the two-fluid atomizing spray gun; the nozzle of the two-fluid atomizing spray gun is connected to the drying chamber, and the material enters the drying chamber after forming small droplets; the fan is connected to the air inlet of the two-fluid atomizing spray gun; the air regulating valve is located between the fan and the air inlet of the two-fluid atomizing spray gun; and the screw pump is connected to the liquid inlet of the two-fluid atomizing spray gun.

[0018] The two-fluid atomizing spray gun nozzle and the two-fluid spray device are used for PVDF coating of a diaphragm. The process includes: High-pressure air is introduced into the air inlet, where the air flow rate is relatively fast. Liquid is introduced into the liquid inlet, where the low-flow-rate liquid encounters the extremely fast-moving air, generating tremendous friction and shear force. Combined with the centrifugal force generated by the rotation of the mixed liquid from the inlet to the outlet, the mixed liquid is atomized into small droplets.

[0019] Furthermore, the specific methods for applying the two-fluid atomizing spray gun nozzle and the two-fluid spray device include the following steps: S1: The polymerized PVDF emulsion is prepared with a certain solid content and is ready for use; S2: Control the temperature of the drying chamber, open the air regulating valve, control the required air pressure, and turn on the feed fan and screw pump; S3: Wet PVDF material is injected into the air and liquid mixing chamber through the liquid inlet by a screw pump. Air enters the air and liquid mixing chamber through the air inlet and collides with the liquid on the impact rudder to generate friction and shear force. The material forms small droplets through the nozzle and enters the drying chamber. S4: Continuous feeding and discharging.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1) The two-fluid atomizing spray gun nozzle provided in this technical solution can effectively control the atomization effect of materials in the drying chamber through the structure of the nozzle, reduce the phenomenon of material agglomeration during the drying process, and obtain a product with good particle morphology and relatively uniform particle size for use in diaphragm coating.

[0021] 2) The two-fluid atomizing spray gun nozzle and two-fluid spray device provided by this technical solution further control the appropriate inlet and outlet air temperatures and the solid content of the material through an air regulating valve, which can effectively control the atomization effect of the material in the drying chamber and obtain products with different particle sizes for use in membrane coatings of different systems. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the cross-sectional structure of the nozzle of the two-fluid atomizing spray gun in an embodiment of this utility model.

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the nozzle in an embodiment of this utility model.

[0024] Figure 3 This is a schematic diagram of the structure of the two-fluid spray device in an embodiment of this utility model.

[0025] Figure 4 This is a particle size distribution diagram of the diaphragm-coated PVDF in an embodiment of this utility model.

[0026] Figure 5 This is a SEM image of the particle morphology of the diaphragm-coated PVDF in Embodiment 2 of this utility model.

[0027] Figure 6 This is a SEM image of the particle morphology of the diaphragm-coated PVDF in Embodiment 3 of this utility model.

[0028] Figure 7 This is a SEM image of the particle morphology of the diaphragm-coated PVDF in Embodiment 4 of this utility model.

[0029] Figure 8 This is a SEM image of the particle morphology of the diaphragm-coated PVDF in Embodiment 5 of this utility model.

[0030] Figure 9 This is a SEM image of the particle morphology of the diaphragm-coated PVDF in Embodiment 6 of this utility model.

[0031] Figure 10 This is a schematic diagram of the nozzle and part of the main body of the two-fluid atomizing spray gun in an embodiment of this utility model.

[0032] Figure 11 This is a schematic diagram of the outlet section of the two-fluid atomizing spray gun nozzle in an embodiment of this utility model.

[0033] in: 1. Liquid inlet; 2. Air inlet; 3. Impact rudder; 4. Nozzle; 4-1. Nozzle head; 4-2. Nozzle outlet; 4-3. Divider plate; 5. Air and liquid mixing chamber; 6. Spray gun body; 6-1. Outlet section; 7. Drying chamber; 8. Air regulating valve; 9. Screw pump; 10. Fan. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] The present invention will be further described in detail below with reference to specific embodiments.

[0038] Example 1 like Figures 1-2 As shown, this embodiment provides a two-fluid atomizing spray gun nozzle, which includes a liquid inlet 1, an air inlet 2, an impact rudder 3, a nozzle 4, an air and liquid mixing chamber 5, and a spray gun body 6.

[0039] The air and liquid mixing chamber 5 is located inside the spray gun body 6; the outlet section 6-1, liquid inlet 1, and air inlet 2 are all located inside the spray gun body 6, and the outlet section 6-1, liquid inlet 1, and air inlet 2 are located on different sides of the air and liquid mixing chamber 5, and are all connected to and communicate with the liquid mixing chamber 5.

[0040] The impact rudder 3 is disposed in the air and liquid mixing chamber 5, and the impact rudder 3 is connected to the wall of the air and liquid mixing chamber 5; the impact rudder 3 is used to cause the air and liquid to collide and generate friction and shear force.

[0041] The flow direction of air and liquid materials is as follows: air enters the air and liquid mixing chamber 5 from air inlet 2, and liquid enters the air and liquid mixing chamber 5 from liquid inlet 1. After passing through the impact rudder 3, the mixed materials enter the outlet section 6-1 and are ejected from the nozzle 4.

[0042] like Figure 10 , 11 As shown, the nozzle 4 is a nozzle outlet used to form small droplets of material; the nozzle 4 includes a nozzle outlet 4-2, a partition plate 4-3, and a nozzle head end 4-1; the outlet section 6-1 is connected to the nozzle outlet 4-2; the two ends of the partition plate 4-3 are respectively connected to the wall of the outlet section 6-1 and the nozzle head end 4-1.

[0043] The outlet section 6-1 and the nozzle head end 4-1 are coaxially arranged, and the size of the plane of the nozzle head end 4-1 is smaller than the size of the outlet surface of the outlet section 6-1.

[0044] Three partition plates 4-3 are set up; the three partition plates 4-3 are evenly arranged in a ring array; adjacent spray partition plates 4-3 form nozzle outlets 4-2 at intervals, and the three partition plates 4-3 form three nozzle outlets 4-2 of the same size at intervals.

[0045] The partition plate 4-3 is inclined; the end face of the nozzle head 4-1 protrudes relative to the end face of the outlet section 6-1.

[0046] The air and liquid mixing chamber 5 is connected to the outlet section 6-1; the air and liquid mixing chamber 5 is used for mixing air and liquid.

[0047] The working principle of the impact rudder 3 is as follows: When air and liquid flow in the mixing chamber 5, the impact rudder 3, located within the mixing chamber 5 and connected to the wall, obstructs the flow path of the air and liquid. As the air and liquid flow past the impact rudder 3, they collide with it, causing relative motion between the air and liquid, and between the air and liquid and the impact rudder 3. This relative motion generates friction. Simultaneously, the impact alters the flow state of the fluid, causing interaction between fluids of different velocities and directions, thereby generating shear force.

[0048] The liquid inlet 1 is used to inject liquid materials; the liquid inlet 1, the outlet section 6-1, the nozzle 4, and the air and liquid mixing chamber 5 are coaxially arranged.

[0049] The air inlet 2 is used to inject air; the axis of the air inlet 2 is perpendicular to the axis of the liquid inlet 1.

[0050] like Figure 3 The embodiment shown also provides a two-fluid spray device, which includes the two-fluid atomizing spray gun nozzle described above.

[0051] The two-fluid spray device includes a drying chamber 7, an air regulating valve 8, a screw pump 9, and a fan 10.

[0052] The drying chamber 7 is connected to the nozzle 4 of the two-fluid atomizing spray gun nozzle; the nozzle outlet 4-2 of the nozzle 4 is connected to the drying chamber 7, and the material enters the drying chamber 7 after forming small droplets; the fan 10 is connected to the air inlet 2 of the two-fluid atomizing spray gun nozzle through a pipe; the air regulating valve 8 is located on the pipe between the fan 10 and the air inlet 2 of the two-fluid atomizing spray gun nozzle; the screw pump 9 is connected to the liquid inlet 1 of the two-fluid atomizing spray gun nozzle.

[0053] Example 2 This embodiment provides an application of a two-fluid atomizing spray gun nozzle and a two-fluid spray device, which is used to coat PVDF with a diaphragm.

[0054] S1: The polymerized PVDF emulsion is prepared with a solid content of 10 wt% and is ready for use; S2: Control the temperature of drying chamber 7 to 150℃, open air regulating valve 8, control the required air pressure to 0.2Mpa, and turn on feed fan 10 and screw pump 9; S3: Wet PVDF material (prepared PVDF emulsion) is injected into the air and liquid mixing chamber 5 from the liquid inlet 1 by the screw pump 9. Air enters the air and liquid mixing chamber 5 from the air inlet 2 and collides with the liquid on the impact rudder 3 to generate friction and shear force. The material forms small droplets through the nozzle 4 and enters the drying chamber 7. S4: Continuous feeding and discharging.

[0055] like Figure 4 As shown, by using the two-fluid atomizing spray gun nozzle and two-fluid spray device of this embodiment, a product with good particle morphology and relatively uniform particle size (mainly distributed in 1~10μm) can be obtained, which can be used for diaphragm coating.

[0056] Example 3 This embodiment provides an application of a two-fluid atomizing spray gun nozzle and a two-fluid spray device, which is used to coat PVDF with a diaphragm.

[0057] S1: The polymerized PVDF emulsion is prepared with a solid content of 10 wt% and is ready for use; S2: Control the temperature of drying chamber 7 to 150℃, open air regulating valve 8, set the air pressure to 0.3MPa, and turn on the feed fan 10 and screw pump 9. S3: Wet PVDF material (prepared PVDF emulsion) is injected into the air and liquid mixing chamber 5 from the liquid inlet 1 by the screw pump 9. Air enters the air and liquid mixing chamber 5 from the air inlet 2 and collides with the liquid on the impact rudder 3 to generate friction and shear force. The material forms small droplets through the nozzle 4 and enters the drying chamber 7. S4: Continuous feeding and discharging.

[0058] Example 4 This embodiment provides an application of a two-fluid atomizing spray gun nozzle and a two-fluid spray device, which is used to coat PVDF with a diaphragm.

[0059] S1: The polymerized PVDF emulsion is prepared with a solid content of 10 wt% and is ready for use; S2: Control the temperature of drying chamber 7 to 150℃, open air regulating valve 8, set air pressure to 0.4MPa, and turn on feed fan 10 and screw pump 9; S3: Wet PVDF material (prepared PVDF emulsion) is injected into the air and liquid mixing chamber 5 from the liquid inlet 1 by the screw pump 9. Air enters the air and liquid mixing chamber 5 from the air inlet 2 and collides with the liquid on the impact rudder 3 to generate friction and shear force. The material forms small droplets through the nozzle 4 and enters the drying chamber 7. S4: Continuous feeding and discharging.

[0060] Example 5 This embodiment provides an application of a two-fluid atomizing spray gun nozzle and a two-fluid spray device, which is used to coat PVDF with a diaphragm.

[0061] S1: The polymerized PVDF emulsion is prepared with a solid content of 10 wt% and is ready for use; S2: Control the temperature of drying chamber 7 to 150℃, open air regulating valve 8, set air pressure to 0.5MPa, and turn on feed fan 10 and screw pump 9. S3: Wet PVDF material (prepared PVDF emulsion) is injected into the air and liquid mixing chamber 5 from the liquid inlet 1 by the screw pump 9. Air enters the air and liquid mixing chamber 5 from the air inlet 2 and collides with the liquid on the impact rudder 3 to generate friction and shear force. The material forms small droplets through the nozzle 4 and enters the drying chamber 7. S4: Continuous feeding and discharging.

[0062] Example 6 This embodiment provides an application of a two-fluid atomizing spray gun nozzle and a two-fluid spray device, which is used to coat PVDF with a diaphragm.

[0063] S1: The polymerized PVDF emulsion is prepared with a solid content of 10 wt and is ready for use; S2: Control the temperature of drying chamber 7 to 150℃, open air regulating valve 8, set air pressure to 0.6MPa, and turn on the feed pump; S3: Wet PVDF material (prepared PVDF emulsion) is injected into the air and liquid mixing chamber 5 through the liquid inlet 1 by a screw pump. Air enters the air and liquid mixing chamber 5 through the air inlet 2 and collides with the liquid on the impact rudder 3 to generate friction and shear force. The material forms small droplets through the nozzle 4 and enters the drying chamber 7. S4: Continuous feeding and discharging (PVDF powder is discharged from drying chamber 7).

[0064] In Examples 2-6, a pressure gauge is also installed on the pipe between the fan 10 and the air inlet 2 of the two-fluid atomizing spray gun nozzle. The pressure gauge is used to detect the air pressure entering the nozzle. The selection and specific setting of the pressure gauge are conventional technical means for those skilled in the art, and this utility model does not improve upon them.

[0065] Particle size was tested on the material discharged from drying chamber 7. Weigh (0.1~0.2) g of PVDF powder into a 50 mL beaker, add (10±0.01) g of anhydrous ethanol into the beaker, place a stir bar of about 2.5 mm in the beaker and seal with plastic wrap, sonicate for 5 min, transfer to a magnetic stirrer and stir at 500 rpm for more than 20 min, then drop the sample into a laser particle size analyzer, ensuring that the light-blocking rate is (8~20)% (the relevant instrument parameters are: particle refractive index set to 1.42, water used as dispersant, and dispersant refractive index 1.33).

[0066] The PVDF products prepared in Examples 3-6 were subjected to performance tests using the methods described above. The specific data are shown in the table below: Table 1 Performance Test Results The test results show that Examples 2-6 can meet the particle size requirements for PVDF coating applications in different diaphragm systems, and can be selected according to relevant indicators.

[0067] The particle morphology test results are shown in Figures 5-9 As shown, the test was conducted using SEM Mag500x.

[0068] The test results show that Examples 2-6 can solve the problem of poor material atomization and obtain PVDF materials with good particle morphology.

[0069] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A two-fluid atomizing spray gun nozzle, characterized in that, The two-fluid atomizing spray gun nozzle includes a spray gun body (6) and a nozzle (4). The nozzle (4) is located on one side of the spray gun body (6). The nozzle (4) is the spray gun outlet and is used to make the material form small droplets. The spray gun body (6) has an outlet section (6-1) on one side. The nozzle (4) includes a nozzle outlet (4-2); The outlet section (6-1) is connected to the nozzle outlet (4-2).

2. The two-fluid atomizing spray gun nozzle according to claim 1, characterized in that, The two-fluid atomizing spray gun nozzle also includes an air and liquid mixing chamber (5). The air and liquid mixing chamber (5) is located inside the spray gun body (6); The air and liquid mixing chamber (5) is connected to the outlet section (6-1); The air and liquid mixing chamber (5) is used for mixing air and liquid.

3. The two-fluid atomizing spray gun nozzle according to claim 2, characterized in that, The two-fluid atomizing spray gun nozzle also includes an impact rudder (3). The impact rudder (3) is located inside the air and liquid mixing chamber (5); The impact rudder (3) is connected to the wall of the air and liquid mixing chamber (5); The impact rudder (3) is used to cause air and liquid to collide and generate friction and shear force.

4. The two-fluid atomizing spray gun nozzle according to claim 2, characterized in that, The two-fluid atomizing spray gun nozzle also includes a liquid inlet (1). The liquid inlet (1) is connected to the air and liquid mixing chamber (5); The liquid inlet (1) is used to inject liquid materials; The liquid inlet (1) and outlet section (6-1), nozzle (4), and air and liquid mixing chamber (5) are arranged coaxially.

5. A two-fluid atomizing spray gun nozzle according to claim 2, characterized in that, The two-fluid atomizing spray gun nozzle also includes an air inlet (2). The air inlet (2) is connected to the air and liquid mixing chamber (5); The air inlet (2) is used to inject air; The axis of the air inlet (2) is perpendicular to the axis of the liquid inlet (1).

6. The two-fluid atomizing spray gun nozzle according to claim 1, characterized in that, The nozzle (4) also includes a partition plate (4-3) and a nozzle head end (4-1). The two ends of the partition plate (4-3) are respectively connected to the outlet section (6-1) and the nozzle head end (4-1).

7. A two-fluid atomizing spray gun nozzle according to claim 6, characterized in that, Set up multiple partitions (4-3); Multiple partitions (4-3) are arranged in a circular array; Adjacent spray baffles (4-3) form nozzle outlets (4-2) at intervals.

8. A two-fluid atomizing spray gun nozzle according to claim 6, characterized in that, The partition plate (4-3) is set at an angle; The end face of the nozzle head (4-1) protrudes relative to the end face of the outlet section (6-1).

9. A two-fluid spray device, characterized in that, The two-fluid spray device includes a two-fluid atomizing spray gun nozzle as described in any one of claims 1-8.

10. A two-fluid spray device according to claim 9, characterized in that, The two-fluid spray device includes a drying chamber (7), an air regulating valve (8), a screw pump (9), and a fan (10). The drying chamber (7) is connected to the nozzle (4) of the two-fluid atomizing spray gun nozzle; The nozzle (4) is connected to the drying chamber (7), and the material enters the drying chamber (7) after forming small droplets. The fan (10) is connected to the nozzle of the two-fluid atomizing spray gun; The air regulating valve (8) is located between the fan (10) and the nozzle of the two-fluid atomizing spray gun; The screw pump (9) is connected to the nozzle of the two-fluid atomizing spray gun.

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