Diaphragm valve lance

Abstract

The application relates to a diaphragm valve spray gun, and relates to the technical field of spray guns, which comprises a spray gun body, a gas cavity and a material cavity are formed on the spray gun body, a material spraying opening is formed on one side of the spray gun body close to the material cavity, a gun needle is arranged on the spray gun body, one end of the gun needle sequentially penetrates through the gas cavity and the material cavity, and the one end of the gun needle abuts against the material spraying opening; a positioning assembly is arranged on the spray gun body and used for positioning the gun needle. When the spray gun is not used, the gun needle is used for closing the material spraying opening through the positioning assembly, thereby reducing material leakage and improving the use effect of the spray gun.

Description

Technical Field

[0001] This application relates to the field of spray gun technology, and in particular to diaphragm valve spray guns. Background Technology

[0002] A spray gun is a device that uses fluid dynamics principles to atomize and spray liquids or powders through a nozzle. You can think of it as a high-performance, precisely controlled "spray bottle." Its working principle is: a high-speed airflow or high pressure is generated through an internal channel (usually using compressed air or a high-pressure pump), tearing the liquid into extremely fine particles at the nozzle, thus forming a uniform and controllable spray. Based on the driving method and application, they are mainly divided into the following categories: Pneumatic spray guns: the most common type, using compressed air to atomize paint. Widely used in automotive painting, furniture coating, industrial manufacturing, and other fields, characterized by a smooth and uniform sprayed surface.

[0003] Electric spray guns: These typically have a built-in high-pressure pump, eliminating the need for an external air compressor. They are commonly used for home DIY projects and small-scale repairs, offering convenience, but the spraying precision and results are usually inferior to pneumatic spray guns.

[0004] High-pressure airless spray gun: Utilizes an ultra-high-pressure pump to directly pressurize the paint, then sprays it out from a special nozzle, instantly atomizing it. Suitable for high-viscosity liquids such as paints, anti-corrosion coatings, and marine coatings, as well as large-scale construction scenarios, offering extremely high efficiency.

[0005] Industrial automation spray guns: such as the diaphragm valve spray guns we discussed earlier, are used in automated production lines. They are computer-controlled to achieve precise, high-frequency, and leak-free spraying, such as dispensing adhesives, spraying lubricating oil, and marking.

[0006] Existing spray guns are prone to leakage at the tip after prolonged use, which affects their normal operation. Therefore, there is an urgent need for a spray gun structure that can reduce leakage and improve the spray gun's performance. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a diaphragm valve spray gun, which solves the technical problem that leakage easily occurs at the end of the spray gun, affecting the spray gun's performance.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A diaphragm valve spray gun includes a spray gun body with an air supply chamber and a material supply chamber. A material outlet is formed on the side of the spray gun body near the material supply chamber. A needle is disposed on the spray gun body, one end of which passes sequentially through the air supply chamber and the material supply chamber, and the other end of the needle abuts against the material outlet. A positioning component is disposed on the spray gun body for positioning the needle. Furthermore, the positioning component includes a positioning spring, one end of which abuts against the side of the gun needle away from the nozzle, and the other end abuts against the spray gun body.

[0009] Furthermore, the gun needle is provided with a lifting seat in the air supply chamber, one end of the gun needle is mounted on the lifting seat, and an air passage is formed on the spray gun body, which is connected to the air supply chamber.

[0010] Furthermore, a solenoid valve is installed on the spray gun body, which is used to control the opening or closing of the air passage.

[0011] Furthermore, a diaphragm is installed inside the feeding chamber of the gun needle, one end of which is connected to the spray gun body. A material channel is formed on the spray gun body, and the material channel communicates with the feeding chamber.

[0012] Furthermore, a replacement needle is provided at one end of the gun needle, the replacement needle is threaded onto the gun needle, and one end of the replacement needle abuts against the side of the spray gun body near the spray nozzle.

[0013] Furthermore, the diaphragm is sleeved between the gun needle and the replacement needle, and a support block is provided between the diaphragm and the gun needle, the support block pressing the diaphragm against the replacement needle.

[0014] In summary, this application includes at least the following beneficial technical effects of the diaphragm valve spray gun: Before use, the positioning component presses the needle against the nozzle of the spray gun body and feeds material into the feeding chamber. Because the needle is pressed against the nozzle of the spray gun body, the material cannot be ejected from the nozzle. When material is needed, air is supplied to the air supply chamber. During the air supply process, the needle rises, and as the needle rises, the material is ejected from the nozzle. When not in use, the needle seals the nozzle through the positioning component, thereby reducing material leakage and improving the spray gun's performance. By using a positioning spring to press against the spray gun body and the needle, and by setting up a solenoid valve, the ease of movement of the needle on the spray gun body is improved. The design of the diaphragm and replacement needle, along with the support block that holds the diaphragm firmly against the replacement needle, improves the ease of replacing the diaphragm and replacement needle. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the diaphragm valve spray gun, which is the main feature of this application. Figure 2 This is a cross-sectional view of the diaphragm valve spray gun structure, which is the main feature of this application. Figure 3 This is an exploded schematic diagram of the diaphragm valve spray gun structure, which is the main feature of this application. Figure 4 This is an exploded schematic diagram of the diaphragm valve spray gun structure in state two, which is the main feature of this application.

[0016] Reference numerals: 1. Spray gun body; 11. Air supply chamber; 111. Air passage; 12. Material supply chamber; 121. Material passage; 13. Spray nozzle; 14. Solenoid valve; 2. Gun needle; 21. Lifting seat; 22. Replacement needle; 23. Diaphragm; 24. Support block; 3. Positioning assembly; 31. Positioning spring. Detailed Implementation

[0017] In order to make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0019] This application discloses a diaphragm valve spray gun in its embodiments.

[0020] Reference Figures 1-3 The diaphragm valve spray gun includes a spray gun body 1, within which an air supply chamber 11 and a material supply chamber 12 are formed. A material outlet 13 is formed on the side of the spray gun body 1 near the material supply chamber 12, and the material outlet 13 communicates with the material supply chamber 12. A needle 2 is provided on the spray gun body 1, with one end passing through the air supply chamber 11 and the material supply chamber 12 sequentially, and the other end of the needle 2 abutting against the material outlet 13. A positioning component 3 is provided on the spray gun body 1, which drives the needle 2 to move on the spray gun body 1, thereby opening or closing the material outlet 13.

[0021] Reference Figure 4 The spray gun body 1 has an air passage 111 and a material passage 121. One end of the air passage 111 is connected to the air supply chamber 11 of the spray gun body 1, and the other end is connected to an external air supply device. One end of the material passage 121 is connected to the material supply chamber 12, and the other end is connected to an external material feeder. In use, air and material are supplied to the spray gun body 1 through the air passage 111 and the material passage 121.

[0022] A lifting seat 21 is provided on the side of the gun needle 2 near the air supply chamber 11, and one end of the gun needle 2 is connected to the lifting seat 21. In use, an external air supply device supplies air into the air supply chamber 11 through the air passage 111. As the gas enters the air supply chamber 11, the gas lifts the gun needle 2, causing the gun needle 2 to separate from the spray nozzle 13 of the spray gun body 1. The positioning assembly 3 includes a positioning spring 31, the axis of which is coaxial with the gun needle 2, and one end of the positioning spring 31 abuts against the spray gun body 1, while the other end abuts against the lifting seat 21. In use, the positioning spring 31 presses the lifting seat 21 against the spray gun body 1. At this time, the spray nozzle 13 of the spray gun body 1 is in a closed state. When gas enters the air supply chamber 11, the gas lifts the lifting seat 21, and the positioning spring 31 is in a compressed state. When the air supply stops, the positioning spring 31 presses the lifting seat 21 against the spray gun body 1 again, so that the gun needle 2 closes the spray nozzle 13.

[0023] A solenoid valve 14 is installed on the spray gun body 1. The solenoid valve 14 controls the opening and closing of the air passage 111. By opening and closing the air passage 111 through the solenoid valve 14, the movement efficiency of the nozzle needle 2 on the spray gun body 1 can be improved. Furthermore, the solenoid valve 14 can switch the on / off state precisely and at high speed. In actual use, the response time of the solenoid valve 14 is 2ms.

[0024] During prolonged use, a gap may easily form between the gun needle 2 and the spray gun body 1, causing leakage in the spray gun body 1. Therefore, a replacement needle 22 is provided at the end of the gun needle 2 near the nozzle 13. One end of the replacement needle 22 is threaded onto the gun needle 2. When leakage occurs in the spray gun body 1, the replacement needle 22 is removed from the gun needle body and replaced with a new replacement needle 22 to reduce the gap between the replacement needle 22 and the spray gun body 1.

[0025] Furthermore, a diaphragm 23 is provided between the replacement needle 22 and the gun needle 2, and a support block 24 is provided between the diaphragm 23 and the gun needle 2. The diaphragm 23 is sleeved on the gun needle 2. As the replacement needle 22 rotates, the support block 24 presses the diaphragm 23 against the replacement needle 22, and the other end of the diaphragm 23 is connected to the spray gun body 1. The diaphragm 23 blocks the feeding chamber 12, so that the material entering through the feed tube can only enter the feeding chamber 12. This allows the material to be sprayed out from the nozzle 13. When the gun needle 2 reciprocates within the spray gun body 1, the diaphragm 23 is prone to damage during the reciprocating movement. The replacement needle 22 is removed from the gun needle, and then the diaphragm 23 is removed from the gun needle and replaced with a new diaphragm 23 to reduce the risk of leakage from the spray gun body 1.

[0026] The implementation principle of the diaphragm valve spray gun in this embodiment is as follows: The spray gun body 1 is provided with an air supply chamber 11 and a material supply chamber 12, and the opening and closing of the spray nozzle 13 is controlled by the axial movement of the needle 2. The needle 2 is driven by air pressure, and the airflow is precisely controlled by the solenoid valve 14, resulting in a rapid response. The end of the needle 2 adopts a replaceable threaded connection replacement needle 22 design, and a sealing diaphragm 23 is set to isolate the material supply chamber 12, effectively solving the problems of needle bending and sealing failure caused by material solidification. When wear or blockage occurs, the replacement needle 22 and diaphragm 23 can be quickly replaced, greatly reducing maintenance costs and leakage risks, and improving the reliability and service life of the spray gun.

[0027] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A diaphragm valve spray gun, comprising a spray gun body (1), characterized in that: The spray gun body (1) has an air supply chamber (11) and a material supply chamber (12) formed thereon. A material outlet (13) is formed on the side of the spray gun body (1) near the material supply chamber (12). A needle (2) is provided on the spray gun body (1). One end of the needle (2) passes through the air supply chamber (11) and the material supply chamber (12) in sequence, and one end of the needle (2) abuts against the material outlet (13). A positioning component (3) is provided on the spray gun body (1). The positioning component (3) is used to position the needle (2).

2. The diaphragm valve spray gun according to claim 1, characterized in that: The positioning component (3) includes a positioning spring (31), one end of which abuts against the side of the gun needle (2) away from the nozzle (13), and the other end abuts against the spray gun body (1).

3. The diaphragm valve spray gun according to claim 1, characterized in that: The gun needle (2) is located in the air supply chamber (11) and a lifting seat (21) is provided. One end of the gun needle (2) is installed on the lifting seat (21). An air passage (111) is formed on the spray gun body (1) and the air passage (111) is connected to the air supply chamber (11).

4. The diaphragm valve spray gun according to claim 3, characterized in that: A solenoid valve (14) is installed on the spray gun body (1), and the solenoid valve (14) is used to control the opening or closing of the air passage (111).

5. The diaphragm valve spray gun according to claim 4, characterized in that: The gun needle (2) is located in the feeding chamber (12) and a diaphragm (23) is installed thereon. One end of the diaphragm (23) is connected to the spray gun body (1). A material channel (121) is formed on the spray gun body (1) and the material channel (121) is connected to the feeding chamber (12).

6. The diaphragm valve spray gun according to claim 5, characterized in that: One end of the gun needle (2) is provided with a replacement needle (22), which is threaded onto the gun needle (2) and one end of the replacement needle (22) abuts against the side of the spray gun body (1) near the spray nozzle (13).

7. The diaphragm valve spray gun according to claim 6, characterized in that: The diaphragm (23) is sleeved between the gun needle (2) and the replacement needle (22), and a support block (24) is provided between the diaphragm (23) and the gun needle (2), and the support block (24) presses the diaphragm (23) against the replacement needle (22).

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