Handheld spray gun

Abstract

The utility model discloses a handheld spray gun which comprises a gun head, and a spray can is arranged on the gun head. A coating pipeline is arranged in the gun head, and a spray needle is arranged in the coating pipeline in a sliding fit mode. An air return pipeline communicated with an inner cavity of the sprinkling can is arranged in the gun head, a sliding piece is arranged in the gun head in a sliding fit mode, and the sliding piece is in linkage connection with the spraying needle; and when the head part of the spray needle blocks the spraying opening of the spray head, the sliding piece blocks the air inlet of the air return pipeline. The handheld spray gun can effectively prevent paint from entering the air duct from the air return pipeline, the motor is prevented from being burnt out, and normal use of the spray gun is guaranteed.

Description

Technical Field

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

[0002] The handheld 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 handheld spray gun.

[0003] A spray pot is further connected to the gun head. The spray pot is connected with the paint pipeline through a suction pipe. Air ducts are 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 an 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 be blown 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 existing handheld spray gun has the following defects: when the handheld spray gun is tilted or the gun head is facing up to spray the ceiling, 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. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a handheld spray gun which 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 present utility model is to provide a hand-held spray gun with the following structure, including a gun head, and a spray pot is provided on the gun head; a paint pipeline is provided in the gun head, and a spray needle is slidably fitted in the paint pipeline; a return air pipeline communicating with the inner cavity of the spray pot is provided in the gun head, a sliding member is slidably fitted in the gun head, and the sliding member is linked with the spray needle; when the head of the spray needle blocks the spraying port of the nozzle, the sliding member blocks the air inlet of the return air pipeline.

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

[0008] Since a sliding member is slidably fitted in the gun head of the hand-held spray gun of the present utility model, and the sliding member is linked with the spray needle; when the head of the spray needle blocks the spraying port of the nozzle, the sliding member blocks the air inlet of the return air pipeline. In this way, when the spray gun is tilted or the gun head is placed upward, the paint will not flow out from the return air pipeline and enter the air duct, which can effectively avoid burning out the motor and ensure the normal use of the spray gun.

[0009] As an improvement, a chute is provided in the gun head, and the sliding member is slidably fitted in the chute; when the spray needle slides, it drives the sliding member to slide in the chute. After adopting this structure, the installation structure of the sliding member is simple and the assembly is convenient.

[0010] As an improvement, an opening is provided at one end of the paint pipeline far from the nozzle, and the tail of the spray needle is exposed outside the opening; the tail of the sliding member is connected to the tail of the spray needle. After adopting this structure, the connection structure between the spray needle and the sliding member is simple and the assembly is convenient.

[0011] As an improvement, the air inlet of the return air pipeline is provided on the side wall of the return air pipeline, the air inlet communicates with the chute, and the head of the sliding member can block the air inlet. After adopting this structure, the matching structure between the sliding member and the return air pipeline is simple, the assembly is convenient, and the sealing effect is good.

[0012] As an improvement, a cavity is provided in the sliding member, the end of the sliding member far from the air inlet is closed, an inlet is provided at the end of the sliding member close to the air inlet, and the inlet can be docked with the air inlet. After adopting this structure, the cavity is used to store paint and gas.

[0013] As an improvement, a through hole is provided on the side wall of the sliding member, and the through hole is in communication with the cavity and the air duct of the sliding member; a waterproof breathable membrane is provided on the side wall of the sliding member, and the waterproof breathable membrane covers the through hole. After adopting this structure, there will be a stream of air remaining in the air return channel when the spray gun is closed. 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 generated in the air duct at this time, it will not disperse the paint sprayed out from the nozzle, so the wall surface will be splashed. In the present utility model, the waterproof 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 breathable membrane, so that the air return channel is depressurized, and the wall surface will not be splashed when the spray gun is started again.

[0014] As an improvement, a sealing ring is provided at the head of the sliding member, and the sealing ring can abut against the periphery of the air inlet of the air return pipe. After adopting this structure, the sealing effect of the sealing ring is better.

[0015] As an improvement, a connecting rod is provided at the tail of the sliding member, and a plugging portion is provided on the connecting rod, and the tail of the spray needle is plugged into the plugging portion. After adopting this structure, the sliding member and the spray needle are connected by the connecting rod, and the connection structure is simple and convenient for assembly. Description of the Drawings

[0016] Figure 1 It is a cross-sectional view of the gun head of the hand-held spray gun of the present utility model.

[0017] Figure 2 is Figure 1 an enlarged structural view of part A in

[0018] Figure 3 is Figure 1 an enlarged structural view of part B in

[0019] Figure 4 It is a cross-sectional view of the gun head of the hand-held spray gun of the present utility model.

[0020] Figure 5 It is a three-dimensional structural view of the gun head of the hand-held spray gun of the present utility model.

[0021] Figure 6 It is a partial assembled structural view of the hand-held spray gun of the present utility model.

[0022] Figure 7 It is a partial exploded structural view of the hand-held spray gun of the present utility model.

[0023] As shown in the figure: 1. Coating channel, 2. Air duct, 3. Sprayer connecting seat, 4. Spray needle, 5. Spraying port, 6. Return air duct, 601. Air inlet, 7. Slide groove, 8. Sliding part, 801. Cavity, 802. Inlet, 803. Through hole, 9. Connecting rod, 901. Insertion part, 10. Waterproof and breathable membrane, 11. Sealing ring. Detailed implementation

[0024] To better understand the present application, more detailed descriptions will be made for various aspects of the present application 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 for illustration only 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 their combinations.

[0027] As Figures 1 to 7 shown, the present application discloses a handheld spray gun, including a gun head and a gun body. An insertion part 901 is provided at the tail of the gun head, and an insertion port is provided at the head of the gun body. The insertion part 901 is detachably connected in the insertion port.

[0028] A coating pipeline 1 and an air duct 2 are provided in the gun head. A sprayer connecting seat 3 is provided on the gun head, and the open end 101 of the sprayer is threadedly connected to the sprayer connecting seat 3. A spray needle 4 is slidably fitted in the coating pipeline 1, and one end of the spray needle 4 can block the spraying port 5 of the nozzle on the gun head. A return air duct 6 is provided in the gun head, and the return air duct 6 passes through the sprayer connecting seat 3 and is communicated with the inner cavity of the sprayer.

[0029] A slide groove 7 is provided in the gun head, and a sliding part 8 is slidably fitted in the slide groove 7. The sliding part 8 is linked with the spray needle 4. An opening 101 is provided at one end of the coating pipeline 1 away from the nozzle, and the tail of the spray needle 4 is exposed outside the opening 101. A connecting rod 9 is provided at the tail of the sliding part 8, and an insertion part 901 is provided on the connecting rod 9. The tail of the spray needle 4 is inserted into the insertion part 901, and the sliding of the spray needle 4 drives the sliding part 8 to slide in the slide groove 7.

[0030] The air inlet 601 of the return air duct 6 is provided on the side wall of the return air duct 6. The air inlet 601 is communicated with the chute 7, and the head of the sliding member 8 can block the air inlet 601. A cavity 801 is provided inside the sliding member 8. The end of the sliding member 8 away from the air inlet 601 is closed, and an inlet 802 is provided at the end of the sliding member 8 close to the air inlet 601. The inlet 802 can be docked with the air inlet 601. A through hole 803 is provided on the side wall of the sliding member 8. The through hole 803 is communicated with the cavity 801 of the sliding member 8 and the air duct 2. A waterproof breathable membrane 10 is provided on the side wall of the sliding member 8. The waterproof breathable membrane 10 covers the through hole 803. A sealing ring 11 is provided at the head of the sliding member 8. The sealing ring 11 can abut against the periphery of the air inlet 601 of the return air duct 6.

[0031] When the hand-held spray gun disclosed in the present application is working, one end of the spray needle 4 is separated from the spraying port 5 of the spray head, and the sealing ring 11 of the sliding member 8 is also separated from the air inlet 601 of the return air duct 6. Part of the air flow in the air duct 2 will enter the return air channel and then enter the spray pot. This air flow can increase the air pressure in the spray pot, press the paint out of the spray pot and into the paint pipeline 1 of the spray gun. When the spray gun is closed, the spray needle 4 moves to block the spraying port 5, and at the same time drives the sliding member 8 to move in the chute 7 so that the sealing ring 11 blocks the air inlet 601 of the return air duct 6. The gas in the return air duct 6 will enter the inner cavity of the sliding member 8 and be discharged into the air duct 2 through the waterproof breathable membrane 10 to achieve the effect of pressure relief. If the spray gun is tilted or the gun head is placed upward, the paint in the spray pot will enter the return air duct 6 and the inner cavity of the sliding member 8, but will not enter the air duct 2. Since the gas in the return air duct has been depressurized, when the motor is started again and there is no high-pressure air flow in the air duct, the paint in the spray pot will not be pressed out, so that the wall surface will not be sprayed or the user's hand will not be soiled, improving the user's experience.

[0032] The present utility model is not limited to the above-mentioned optimal implementation manner. Anyone can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as it has a technical solution identical or similar to that of the present application, it falls within the protection scope of the present utility model.

Claims

1. A hand-held spray gun, comprising a gun head, wherein a spray pot is provided on the gun head; a paint pipeline is provided in the gun head, and a spray needle is slidably fitted in the paint pipeline; a back air pipeline communicating with the inner cavity of the spray pot is provided in the gun head, and it is characterized in that: A sliding member is slidably fitted inside the gun head, and the sliding member is linked with the injection needle; when the head of the injection needle blocks the spraying port of the nozzle, the sliding member blocks the air inlet of the air return pipe.

2. The hand-held spray gun according to claim 1, wherein: A chute is provided inside the gun head, and the sliding member is slidably fitted in the chute; when the injection needle slides, it drives the sliding member to slide in the chute.

3. The hand-held spray gun according to claim 2, wherein: An opening is provided at one end of the paint pipe away from the nozzle, and the tail of the injection needle is exposed outside the opening; the tail of the sliding member is connected to the tail of the injection needle.

4. The hand-held spray gun according to claim 2, wherein: The air inlet of the air return pipe is provided on the side wall of the air return pipe, the air inlet communicates with the chute, and the head of the sliding member can block the air inlet.

5. The hand-held spray gun according to claim 4, characterized in that: A cavity is provided inside the sliding member, the end of the sliding member away from the air inlet is closed, and an inlet is provided at the end of the sliding member close to the air inlet, and the inlet can be docked with the air inlet.

6. The hand-held spray gun according to claim 5, wherein: A through hole is provided on the side wall of the sliding member, and the through hole communicates with the cavity and the air duct of the sliding member; a waterproof breathable film is provided on the side wall of the sliding member, and the waterproof breathable film covers the through hole.

7. The hand-held spray gun according to claim 5, wherein: A sealing ring is provided on the head of the sliding member, and the sealing ring can abut against the periphery of the air inlet of the air return pipe.

8. The hand-held spray gun according to claim 3, characterized in that: A connecting rod is provided at the tail of the sliding member, and a plugging portion is provided on the connecting rod, and the tail of the injection needle is plugged into the plugging portion.

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