Spray gun

Abstract

The utility model discloses a spray gun which comprises a gun head, an air return pipeline is arranged in the gun head, one end of the air return pipeline is communicated with an air channel in the gun head, and the other end of the air return pipeline is communicated with an inner cavity of a spray can connected to the gun head. And the other end of the air return pipeline is bent to form a bent part. The spray gun can effectively prevent paint from entering the air duct from the air return pipeline, prevent the motor from being burnt out, and ensure the normal use of the spray gun.

Description

Technical Field

[0001] The utility model relates to the technical field of spraying equipment, and more specifically to a spray gun. Background Art

[0002] The spray gun uses the rapid release of compressed air as power to spray paint. It includes a gun body, a gun head and a trigger. The gun body and the gun head are connected by a connecting mechanism. A paint pipeline is provided in the gun head. A nozzle is provided at the head of the gun head. The middle part of the nozzle is a paint nozzle orifice, and the paint nozzle orifice is communicated with the paint pipeline. A spray needle is movably connected in the paint pipeline. The spray needle is connected with the trigger. The head of the spray needle blocks the paint nozzle orifice. Pulling the trigger can drive the spray needle to slide, so as to block or disengage from the paint nozzle orifice, thereby controlling the on or off of the spray gun.

[0003] A spray pot is also connected to the gun head. The spray pot is connected to the paint pipeline through a suction pipe. An air duct is provided in the gun body and the gun head. An air outlet is provided at the nozzle and is located outside the paint nozzle orifice. The air outlet is communicated with the air duct. A motor is provided in the gun body. Starting the motor can generate air flow. The air flow blows out from the air outlet through the air duct. At this time, when the paint nozzle orifice is opened, the air flow can drive the paint to spray out of the nozzle.

[0004] A return air pipeline is provided in the gun head. One end of the return air pipeline is communicated with the air duct, and the other end of the return air pipeline is communicated with the spray pot. Part of the air flow in the air duct will blow into the spray pot through the return air pipeline to make the spray pot have a certain air pressure. During the working process of the spray gun, the air flow blown out through the return air pipeline presses out the paint in the spray pot to ensure the smooth progress of the spraying work. However, the spray gun of the prior art has the following defects: when the gun head of the spray gun is upward for spraying, the paint in the spray pot will enter the return air pipeline, and then enter the air duct and flow back into the motor, thus burning out the motor and affecting the service life of the spray gun. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a spray gun that can effectively prevent the paint from entering the air duct from the return air pipeline, avoid burning out the motor, and ensure the normal use of the spray gun.

[0006] The technical solution of the utility model is to provide a spray gun with the following structure, including a gun head. A return air pipeline is provided in the gun head. One end of the return air pipeline is communicated with the air duct in the gun head, and the other end of the return air pipeline is communicated with the inner cavity of the spray pot connected to the gun head; the other end of the return air pipeline is bent to form a bent part.

[0007] After adopting the above structure, the spray gun of the present utility model has the following advantages compared with the prior art:

[0008] Since the other end of the air return pipe of the spray gun of the present utility model is bent to form a bent portion, when the spray gun head is upward for spraying, due to the action of the bent portion, the paint in the spray pot will not enter the air return pipe, and thus will not enter the air duct and will not flow back into the motor, so the motor will not be burned out, ensuring that the spray gun can be used normally.

[0009] As an improvement, the central axis of the pipe body of the air return pipe intersects with the central axis of the bent portion to form an angle of not less than 80° and not more than 120°. After adopting this structure, the bending angle effect of this kind of bent portion is better.

[0010] As an improvement, the central axis of the pipe body of the air return pipe intersects with the central axis of the bent portion to form a 90° angle. After adopting this structure, the bending angle effect of this kind of bent portion is the best.

[0011] As an improvement, the air return pipe includes a first pipe, a second pipe and a duct; the first pipe is connected to the air duct, the second pipe is connected to the first pipe, one end of the duct is connected to the second pipe, the other end of the duct is communicated with the inner cavity of the spray pot, and the other end of the duct is bent to form the bent portion. After adopting this structure, the structure is simple and the assembly is convenient.

[0012] As an improvement, a check valve is provided in the first pipe. The check valve includes a valve seat, a valve core and an elastic member. The valve seat is provided at the air inlet of the first pipe, and the valve core is pressed against the valve seat by the elastic member; when the valve core is pressed and separated from the valve seat, the air flow flows from the air duct through the air return pipe into the inner cavity of the spray pot. After adopting this structure, due to the action of the check valve, when the spray gun is closed, the check valve will also be closed, which can further prevent the paint from entering the air duct.

[0013] As an improvement, the spool includes a sliding member and a waterproof and breathable membrane. A channel is provided in the middle of the sliding member, and one end of the sliding member abuts against the elastic member; the waterproof and breathable membrane is provided at the other end of the sliding member and covers the opening at one end of the channel. After adopting this structure, when the spray gun is closed, a stream of air will remain in the air return channel. If the pressure is not relieved, when the spray gun is opened again, this stream of air will press out the paint in the paint pot and spray it out from the nozzle. Since there is no air flow in the air duct at this time, it will not disperse the paint sprayed out from the nozzle, so the wall surface will be sprayed unevenly. In the present utility model, the waterproof and breathable membrane covers the opening at one end of the channel of the sliding member, and this stream of air can be discharged from the waterproof and breathable membrane, so that the air return channel is depressurized, and the wall surface will not be sprayed unevenly when the spray gun is started again.

[0014] As an improvement, a plurality of ribs are provided on the inner wall of the first pipe, and the sliding member is slidably fitted between the plurality of ribs. After adopting this structure, the ribs separate a gap between the spool and the inner wall of the first pipe. When the spool is opened, the air flow can flow out from this gap, with a simple structure and good ventilation effect.

[0015] As an improvement, a ventilation hole is provided in the middle of the valve seat; one end of the valve seat is tightly fitted in the air inlet of the first pipe, and the other end of the valve seat extends outside the air inlet of the first pipe. After adopting this structure, the valve seat is more convenient to disassemble and assemble.

[0016] As an improvement, the elastic member is a return spring. A spring seat is provided inside the end of the first pipe away from the valve seat. One end of the return spring abuts against the spring seat, and the other end of the return spring abuts against the one end of the sliding member. After adopting this structure, the structure is simple and the assembly is convenient. Description of the Drawings

[0017] Figure 1 It is a cross-sectional schematic view of a part of the structure of the spray gun of the present utility model.

[0018] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0019] Figure 3 a schematic view of a part of the structure of the spray gun of the present utility model.

[0020] Figure 4 an exploded schematic view of a part of the structure of the spray gun of the present utility model.

[0021] Figure 5 a schematic view of the structure of the valve seat of the spray gun of the present utility model.

[0022] Figure 6This is a schematic structural diagram of the gun head of the spray gun of the present utility model.

[0023] As shown in the figure: 1. Gun head, 101. Coating channel, 102. Air duct, 103. Spray pot connection seat, 104. First pipe, 1041. Air inlet, 1042. Air outlet, 1043. Rib, 1044. Spring seat, 105. Second pipe, 106. Bending part, 107. Air guide pipe, 2. Check valve, 201. Valve seat, 202. Valve core, 2021. Sliding part, 2022. Waterproof and breathable membrane, 2023. Channel, 203. Return spring, 204. Ventilation hole, 205. Embedded groove, 206. Limit baffle, 3. Spray pot. Detailed implementation manners

[0024] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0025] In the accompanying drawings, for the sake of clarity, the thickness, dimensions and shapes of the objects have been slightly exaggerated. The drawings are only examples and are not drawn to an exact scale.

[0026] It should also be understood that the terms "comprise", "include", "have", "contain" when used in this specification denote the presence of the stated features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0027] As Figures 1 to 6 shown, the present application discloses a spray gun, including a gun head 1 and a gun body. A plug-in part is provided at the tail of the gun head 1, and a plug-in port is provided at the head of the gun body. The plug-in part is detachably connected in the plug-in port.

[0028] A coating pipeline, an air duct 102 and a return air pipeline are provided in the gun head 1. A spray pot connection seat 103 is provided on the gun head 1. The open end of the spray pot 3 is threadedly connected to the spray pot connection seat 103. One end of the return air pipeline is communicated with the air duct 102 in the gun head 1, and the other end of the return air pipeline is communicated with the inner cavity of the spray pot 3.

[0029] The return air duct described above includes a first duct 104, a second duct 105 and a ventilation duct 107. The first duct 104 is arranged inside the gun head 1, and the first duct 104 is arranged along the length direction of the gun head 1. The second duct 105 is arranged inside the spray bottle connector 103, and the second duct 105 is arranged along the height direction of the spray bottle connector 103. The first duct 104 is provided with an air inlet 1041 and an air outlet 1042. The second duct 105 is connected to the air outlet 1042, and the second duct 105 is communicated with the first duct 104.

[0030] One end of the ventilation duct 107 is connected to the second duct 105, that is, one end of the ventilation duct 107 is inserted into the second duct 105, and the other end of the ventilation duct 107 is bent to form a bent portion 106. The central axis of the bent portion 106 intersects with the central axis of the pipe body of the ventilation duct 107 to form an included angle a that is not less than 80° and not greater than 120°. It is optimal that the central axis of the bent portion 106 intersects with the central axis of the pipe body of the ventilation duct 107 to form an included angle a of 90°.

[0031] A one-way valve 2 is arranged between the air inlet 1041 and the air outlet 1042. The one-way valve 2 includes a valve seat 201, a valve core 202 and an elastic member. The valve seat 201 is detachably connected inside the air inlet 1041 of the first duct 104, and a ventilation hole 204 is arranged in the middle of the valve seat 201. The valve core 202 and the elastic member are installed inside the first duct 104. The valve core includes a sliding member 2021 and a waterproof and breathable membrane 2022. A channel 2023 is arranged in the middle of the sliding member 2021. One end of the sliding member 2021 abuts against the elastic member. The waterproof and breathable membrane 2022 is arranged at the other end of the sliding member 2021 and covers the opening at one end of the channel 2023. A plurality of ribs 1043 are arranged on the inner wall of the first duct 104, and the sliding member 2021 is slidably matched between the plurality of ribs 1043. The elastic member is a return spring 203. A spring seat 1044 is arranged inside the first duct 104 at the end far from the valve seat 201. One end of the return spring 203 abuts against the spring seat 1044, and the other end of the return spring 203 abuts against the sliding member 2023.

[0032] One end of the described valve seat 201 is tightly fitted into the air inlet 1041 of the first pipeline 104, and the other end of the valve seat 201 extends outside the air inlet 1041 of the first pipeline 104. An embedding groove 205 is provided on the outer wall of the said one end of the valve seat 201, and the convex rib 1043 is embedded in the embedding groove 205. A limit baffle 206 is provided at the said other end of the valve seat 201, and the limit baffle 206 abuts against the end face of the first pipeline 104.

[0033] When a spray gun disclosed in this application is working, a part of the air flow in the air duct 102 will enter the ventilation hole 204 of the valve seat 201. Under the action of the air pressure of this air flow, the valve core 202 will be pushed open and enter the air return channel, and then enter the inner cavity of the spray pot 3, so as to increase the air pressure in the spray pot 3 and press the paint in the spray pot 3 out of the spray pot 3 and into the paint channel 101. After the spray gun is closed, under the action of the bending part 106, the paint in the spray pot 3 will not flow into the air return channel when the spray gun is placed upward. Under the combined action of the one-way valve 2, when the spray gun is tilted, the paint in the spray pot will not flow out of the air return channel either. At the same time, under the action of the waterproof and breathable membrane 2022, after the spray gun is closed, the air flow in the air return pipeline will pass through the waterproof and breathable membrane and be discharged from the ventilation hole 204 of the valve seat 201, achieving the function of air leakage, avoiding spraying the wall surface or soiling the user's hands when the spray gun is started again, and improving the user experience.

[0034] The utility model is not limited to the above best implementation mode. Anyone can obtain other various forms of products under the inspiration of the utility model. However, no matter what changes are made in its shape or structure, as long as it has the same or similar technical solutions as this application, they all fall within the protection scope of the utility model.

Claims

1. A spray gun, comprising a gun head, wherein an air return duct is arranged in the gun head, one end of the air return duct is communicated with an air duct in the gun head, and the other end of the air return duct is communicated with the inner cavity of a spray pot connected to the gun head; characterized in that: The other end of the return air duct is bent to form a bent portion.

2. The spray gun according to claim 1, wherein: The central axis of the pipe body of the return air duct intersects with the central axis of the bent portion to form an included angle of not less than 80° and not more than 120°.

3. The spray gun according to claim 2, characterized in that: The central axis of the pipe body of the return air duct intersects with the central axis of the bent portion to form a 90° included angle.

4. The spray gun according to claim 2, characterized in that: The return air duct includes a first duct, a second duct and a guide air duct; the first duct is connected to the air duct, the second duct is connected to the first duct, one end of the guide air duct is connected to the second duct, the other end of the guide air duct is communicated with the inner cavity of the sprayer, and the other end of the guide air duct is bent to form the bent portion.

5. The spray gun according to claim 4, wherein: A one-way valve is arranged in the first duct. The one-way valve includes a valve seat, a valve core and an elastic member. The valve seat is arranged at the air inlet of the first duct, and the valve core is pressed against the valve seat by the elastic member; when the valve core is pressed and separated from the valve seat, the air flow flows from the air duct through the return air duct and then into the inner cavity of the sprayer.

6. The spray gun according to claim 5, characterized in that: The valve core includes a sliding member and a waterproof breathable membrane. A channel is arranged in the middle of the sliding member, and one end of the sliding member abuts against the elastic member; the waterproof breathable membrane is arranged at the other end of the sliding member and covers the opening at one end of the channel.

7. The spray gun according to claim 6, wherein: A plurality of convex ribs are arranged on the inner wall of the first duct, and the sliding member is slidably matched between the plurality of convex ribs.

8. The spray gun according to claim 6, wherein: A ventilation hole is arranged in the middle of the valve seat; one end of the valve seat is tightly fitted in the air inlet of the first duct, and the other end of the valve seat extends outside the air inlet of the first duct.

9. The spray gun according to claim 6, characterized in that: The elastic member is a return spring. A spring seat is arranged in the first duct at the end far from the valve seat. One end of the return spring abuts against the spring seat, and the other end of the return spring abuts against the one end of the sliding member.

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