spray gun

Abstract

A spray gun includes a gun head and a spray gun body. The gun head includes a nozzle assembly, a nut, a gun base, a spray liquid container assembly, and a connecting part that connects the gun base and the spray liquid container assembly. The nozzle assembly is located at the front end of the gun base. The front end of the spray gun body has an interface tube with external threads, and the bottom of the interface tube has an axially extending notch that penetrates the front end face of the interface tube. The gun base extends into the interface tube, and the connecting part passes downward through the notch. The spray liquid container assembly is located below the interface tube. The nut is screwed to the front end of the interface tube, holding the nozzle assembly and the gun base within the interface tube. This invention enables convenient assembly and disassembly of the gun head and the spray gun body, and has low manufacturing costs.

Description

Technical Field

[0001] This utility model relates to a spray gun for spraying coatings. Background Technology

[0002] To facilitate cleaning and maintenance, most existing HVLP spray guns (high-flow, low-pressure spray guns) have their nozzle and body designed as two separate parts, assembled together by a detachable connection structure. While this design allows the nozzle to be disassembled for cleaning after painting, the complexity of the detachable connection structure often leads to inconvenience in disassembly and assembly, and significantly increases manufacturing costs. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a spray gun that can be easily disassembled and assembled from the nozzle and the spray gun body, and has low manufacturing cost.

[0004] According to an embodiment of the present invention, a spray gun includes a gun head and a spray gun body. The gun head includes a nozzle assembly, a nut, a gun base, a spray liquid container assembly, and a connecting part that connects the gun base and the spray liquid container assembly together. The nozzle assembly is disposed at the front end of the gun base. The front end of the spray gun body is provided with an interface tube, the front end of which is provided with an external thread. The bottom of the interface tube is provided with an axially extending notch that penetrates the front end face of the interface tube. The gun base extends into the interface tube, the connecting part passes downward through the notch, and the spray liquid container assembly is located below the interface tube. The nut is screwed to the front end of the interface tube, holding the nozzle assembly and the gun base in the interface tube.

[0005] In this embodiment of the utility model, the nozzle head is directly fixed to the spray gun body by a nut using a threaded structure, making it more convenient and quick to assemble and disassemble the nozzle head. The nut can fix the nozzle assembly and the gun base at the same time, resulting in a simple structure and reduced manufacturing costs. Attached Figure Description

[0006] Figure 1 A schematic diagram of the appearance of a spray gun according to an embodiment of the present invention is shown.

[0007] Figure 2 An explosion diagram of a spray gun according to an embodiment of the present invention is shown.

[0008] Figure 3 An exploded cross-sectional view of a spray gun according to an embodiment of the present invention is shown.

[0009] Figure 4 A schematic cross-sectional view of a spray gun according to an embodiment of the present invention is shown. Detailed Implementation

[0010] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0011] Please refer to Figures 1 to 4 According to an embodiment of the present invention, a spray gun includes a nozzle 1 and a spray gun body 2. The nozzle 1 includes a nozzle assembly 10, a nut 13, a gun base 15, a spray liquid container assembly 16, and a connecting portion 17 that connects the gun base 15 and the spray liquid container assembly 16 together. The spray gun body 2 includes a housing 21, a handle 22, a blower 23, and a trigger 24.

[0012] The front end of the spray gun body 2 (i.e., the front end of the housing 21) is provided with an interface tube 25. The front end of the interface tube 25 is provided with an external thread 251, and the bottom of the interface tube 25 is provided with an axially extending notch 252, which penetrates the front end face of the interface tube 25. The rear end of the housing 21 is provided with a rear cover 26. The blower 23 is disposed inside the housing 21 and close to the rear cover 26. The blower 23 is used to generate compressed gas. The upper end of the handle 22 is connected to the housing 21.

[0013] The spray gun body 2 also includes a valve body 27, an elastic element 28, and a valve needle 29. The valve body 27 is connected to the housing 21 and has an inner cavity 270. The rear parts of the elastic element 28 and the valve needle 29 are located in the inner cavity 270, and the two ends of the elastic element 28 abut against the rear parts of the valve body 27 and the valve needle 29, respectively. The trigger 24 is connected to the valve needle 29. When the spray gun is performing a spraying operation, the operator pulls the trigger 24, which can drive the valve needle 29 to overcome the elastic force of the elastic element 28 and retract, thereby opening the liquid outlet 112 located at the center of the main nozzle 11, which will be mentioned below. Optionally, the elastic element 28 is a spring.

[0014] The gun holder 15 extends into the interface tube 25, and the connecting part 17 passes downward through the notch 252. The spray liquid container assembly 16 is located below the interface tube 25. The nozzle assembly 10 is located at the front end of the gun holder 15. The nut 13 has an internal thread that matches the external thread 151. The nut 13 is screwed to the front end of the interface tube 25, holding the nozzle assembly 10 and the gun holder 15 in the interface tube 25.

[0015] The nozzle assembly 10 abuts against the interface pipe portion 25 and the nut 13 in the axial direction. The nozzle assembly 10 includes a main nozzle 11 and an adjusting nozzle 12. The adjusting nozzle 12 is coaxially and rotatably mounted on the main nozzle 11 to change the airflow, thereby adjusting the spray width. The main nozzle 11 abuts against the interface pipe portion 25 in the axial direction of the nozzle assembly 10, and the adjusting nozzle 12 abuts against the nut 13 in the axial direction of the nozzle assembly 10.

[0016] Specifically, the main nozzle 11 has a central column 111, which has an axially extending outlet hole 112. The central column 111 extends into the central through hole 120 of the adjusting nozzle 12. The side of the main nozzle 11 has a circumferentially extending limiting groove 113, and the side of the adjusting nozzle 12 has a radially protruding limiting block 123. The limiting block 123 extends into the limiting groove 113 and can rotate within the limiting groove 113. Optionally, there are two limiting blocks 123 and two limiting grooves 113, with the two limiting blocks 123 extending into the two limiting grooves 113 respectively. The front end of the central through hole of the nut 13 has a radially extending stop protrusion 132, and the outer side of the adjusting nozzle 12 has a stop step surface 122 that mates with the stop protrusion 132. The stop protrusion 132 abuts against the stop step surface 122. The outer side of the main nozzle 11 is provided with a blocking step surface 115, which abuts against the front end surface of the interface pipe 25.

[0017] The gun holder 15 includes an inner tube 15a and an outer tube 15b. The outer tube 15b surrounds the inner tube 15a, and the inner circumferential surface of the outer tube 15b is connected to the outer circumferential surface of the inner tube. The gap between the inner circumferential surface of the outer tube 15b and the outer circumferential surface of the inner tube 15a forms the air supply channel 15c of the gun holder 15. The central hole of the inner tube 15a constitutes the spray liquid channel 15d of the gun holder.

[0018] The nozzle assembly 10 is sealed and fitted over the front end of the inner tube 15a. Specifically, the outlet hole 112 of the main nozzle 11 is sealed and fitted over the front end of the inner tube 15a, and the front part of the valve needle 29 passes through the central hole of the inner tube 15a and extends into the outlet hole 112. In this embodiment, the outer surface of the front end of the inner tube 15a is an outer conical surface 157 whose outer diameter gradually increases from front to back, and the wall of the outlet hole of the main nozzle 11 is provided with an inner conical surface 117 that forms a sealing fit with the outer conical surface 157 of the front end of the inner tube 15a. In other embodiments, a rubber sealing ring is used to achieve a seal between the outlet hole 112 of the main nozzle 11 and the front end of the inner tube 15a.

[0019] The rear end of the inner tube 15a is sealed and fitted over the front end of the valve body 27. In this embodiment, the outer surface of the front end of the valve body 27 is an outer conical surface 278 whose outer diameter gradually increases from front to rear, and the central hole wall of the inner tube 15a is provided with an inner conical surface 158 that forms a sealing fit with the outer conical surface 278 of the front end of the valve body 27. In other embodiments, a rubber sealing ring is used to achieve a seal between the central hole wall of the inner tube 15a and the front end of the valve body 27.

[0020] The connecting part 17 is provided with a liquid inlet channel 17d that communicates with the spray liquid channel 15d of the gun holder 15 and an air inlet channel 17c that communicates with the air supply channel 15c of the gun holder 15.

[0021] The spray liquid container assembly 16 includes a container cap 16a, a container body 16b, and a suction tube 16c. The container cap 16a is detachably connected to the container body 16b. An air inlet channel 17c extends through the container cap 16a to allow compressed air to enter the container body 16b. The upper end of the suction tube 16c extends into the liquid inlet channel 17d, and the lower end of the suction tube 16c extends into the container body 16b.

[0022] In this embodiment, the container cap 16a is spirally connected to the container body 16b. The spray liquid container assembly 16 also includes a sealing gasket 16d, which is disposed between the container cap 16a and the container body 16b.

[0023] Furthermore, the bottom surface of the handle 22 is flush with the bottom surface of the container body 16a. The front side of the handle 22 is provided with a forward-extending connecting rib 20, and the side of the container cover 16a is provided with a slot 160 that mates with the connecting rib 20. The connecting rib 20 can be selectively inserted into the slot 160. When the spray gun is placed on a table or other surface and the connecting rib 20 is inserted into the slot 160, it can provide support for the housing 21.

[0024] In some specific implementations, the aforementioned spray gun is an HVLP spray gun.

[0025] The nozzle and the main body of the spray gun are independent of each other. The nozzle can be easily installed and removed by tightening or unscrewing the nut, which not only facilitates cleaning and maintenance, but also reduces manufacturing costs.

[0026] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A spray gun comprising a gun head and a gun body; the gun head comprising a nozzle assembly, a screw cap, a gun seat, a spray liquid container assembly, and a connecting portion connecting the gun seat and the spray liquid container assembly together, the nozzle assembly being arranged at a front end of the gun seat; characterized in that, The front end of the spray gun body is provided with an interface tube, the front end of the interface tube is provided with an external thread, and the bottom of the interface tube is provided with an axially extending notch, which penetrates the front end face of the interface tube. The gun holder extends into the interface tube, the connecting part passes downward through the notch, and the spray liquid container assembly is located below the interface tube; the nut is screwed to the front end of the interface tube, holding the nozzle assembly and the gun holder in the interface tube.

2. The lance of claim 1, wherein The nozzle assembly abuts against the interface tube and the nut in the axial direction of the nozzle assembly.

3. The lance of claim 1, wherein The gun holder includes an inner tube and an outer tube. The outer tube surrounds the inner tube. The inner circumferential surface of the outer tube is connected to the outer circumferential surface of the inner tube, and the gap between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube forms the air supply channel of the gun holder. The nozzle assembly is sealed and fitted over the front end of the inner tube; The spray gun body includes a valve body, an elastic element, and a valve needle. The valve body has an inner cavity, and the rear parts of the elastic element and the valve needle are located in the inner cavity. The two ends of the elastic element abut against the rear parts of the valve body and the valve needle, respectively. The rear end of the inner tube is sealed and fitted outside the front end of the valve body. The front part of the valve needle passes through the central hole of the inner tube and extends into the nozzle assembly. The central hole of the inner tube forms the spray liquid channel of the gun holder.

4. The lance of claim 3, wherein The outer surface of the front end of the valve body is an outer conical surface whose outer diameter gradually increases from front to back, and the central hole wall of the inner tube is provided with an inner conical surface that forms a sealing fit with the outer conical surface.

5. The lance of claim 3, wherein The nozzle assembly includes a main nozzle and an adjusting nozzle, the adjusting nozzle being coaxially and rotatably mounted on the main nozzle; the main nozzle abuts against the interface pipe in the axial direction of the nozzle assembly, and the adjusting nozzle abuts against the nut in the axial direction of the nozzle assembly. The main nozzle has a liquid outlet hole at its center, which is sealed and fitted outside the front end of the inner tube, and the valve needle extends into the liquid outlet hole.

6. The lance of claim 5, wherein The outer surface of the front end of the inner tube is an outer conical surface whose outer diameter gradually increases from front to back, and the wall of the liquid outlet of the main nozzle is provided with an inner conical surface that forms a sealing fit with the outer conical surface.

7. The lance of claim 5, wherein The main nozzle is provided with a central column, and the liquid outlet is provided on the central column, with the central column extending into the central through hole of the adjusting nozzle; The main nozzle has a limiting groove extending in a circumferential direction on its side, and the adjusting nozzle has a limiting block protruding radially on its side. The limiting block extends into the limiting groove and can rotate within the limiting groove.

8. The lance of claim 5 wherein, The nut has a stop protrusion extending radially at the front end of the central through hole, and the outer side of the adjusting nozzle has a stop step surface that mates with the stop protrusion, with the stop protrusion abutting against the stop step surface.

9. The lance of claim 3 wherein, The connecting part is provided with a liquid inlet channel communicating with the spray liquid channel of the gun holder and an air inlet channel communicating with the air supply channel of the gun holder. The spray liquid container assembly includes a container cap, a container body, and a suction tube; the container cap is detachably connected to the container body; the air inlet channel passes through the container cap, the upper end of the suction tube extends into the liquid inlet channel, and the lower end of the suction tube extends into the container body.

10. The lance of claim 9, wherein The spray gun body comprises a handle, the bottom surface of the handle is flush with the bottom surface of the container body, and the front side of the handle is provided with a connecting rib extending forward; The side of the container cover is provided with a clamping groove matched with the connecting rib, and the connecting rib is selectively embedded in the clamping groove.

11. The lance of claim 1 wherein, The spray gun is an HVLP spray gun.

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