Handheld electric spray gun

Abstract

The utility model discloses a handheld electric spray gun which comprises a gun head, a coating pipeline is arranged in the gun head, a spray needle is arranged in the coating pipeline in a sliding fit mode, the spray needle is sleeved with a first sealing ring, a cavity in the coating pipeline is divided into a first cavity and a second cavity through the first sealing ring, and an air return pipeline communicated with an inner cavity of a spray can is arranged in the gun head. The air return pipeline is connected with the coating pipeline; the spray needle is sleeved with a third sealing ring, the third sealing ring is located in the second cavity, and an air return cavity is formed between the first sealing ring and the third sealing ring; the air return cavity is communicated with the air return pipeline, and an air inlet communicated with the air duct is formed in the side wall of the air return cavity; a sealing element is also sleeved outside the spray needle and is positioned in the air return cavity; and when the head part of the spraying head blocks the spraying opening of the spraying head, the sealing element blocks the communication between the air return pipeline and the second cavity. The handheld electric 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] This utility model relates to the field of spray equipment technology, and more specifically to a handheld electric spray gun. Background Technology

[0002] A handheld electric spray gun uses the rapid release of compressed air as power to spray paint. It comprises a gun body, a nozzle, and a trigger, with the gun body and nozzle connected by a connecting mechanism. The nozzle contains a paint channel, and its tip has a nozzle with a central paint nozzle opening connected to the paint channel. A spray needle is movably connected within the paint channel and is connected to the trigger. The tip of the spray needle blocks the paint nozzle opening. Pulling the trigger causes the spray needle to slide, thereby blocking or disengaging from the paint nozzle opening, controlling the handheld electric spray gun to open or close.

[0003] The gun head is also connected to a spray bottle, which is connected to the paint pipe via a suction tube. An air duct is provided inside the gun body and gun head. An air outlet is located around the paint nozzle opening and is connected to the air duct. A motor is installed inside the gun body; starting the motor generates airflow, which flows through the air duct and exits through the air outlet. When the paint nozzle opening is opened, the airflow propels the paint out of the nozzle.

[0004] The spray gun head is equipped with a return air duct, one end of which is connected to the air duct, and the other end is connected to the spray bottle. Part of the airflow in the air duct is blown into the spray bottle through the return air duct, creating a certain air pressure inside the spray bottle. This pressure forces the paint out of the spray bottle through the airflow from the return air duct during operation, ensuring smooth spraying. However, existing handheld electric spray guns have the following drawbacks: when the handheld spray gun is tilted or the nozzle is facing upwards while spraying the ceiling, paint from the spray bottle enters the return air duct, then the air duct, and flows back into the motor, potentially burning out the motor and affecting the spray gun's lifespan. Utility Model Content

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

[0006] The technical solution of this utility model is to provide a handheld electric spray gun with the following structure: a gun head, on which a spray bottle is provided; a paint pipe is provided inside the gun head, and a spray needle is slidably fitted inside the paint pipe; a first sealing ring is fitted around the spray needle, dividing the cavity inside the paint pipe into a first cavity and a second cavity; the first cavity is interconnected with the nozzle of the gun head; a return air pipe is provided inside the gun head and connected to the inner cavity of the spray bottle, and the return air pipe is connected to the paint pipe; a third sealing ring is fitted around the spray needle and located inside the second cavity, forming a return air chamber between the first sealing ring and the third sealing ring; the return air chamber is interconnected with the return air pipe, and an air inlet connected to the air duct is provided on the side wall of the return air chamber; a sealing element is also fitted around the spray needle and located inside the return air chamber; when the head of the spray needle blocks the spray nozzle of the nozzle, the sealing element blocks the connection between the return air pipe and the second cavity.

[0007] With the above structure, the handheld electric spray gun of this invention has the following advantages compared with the prior art:

[0008] Because the handheld electric spray gun of this invention has a return air chamber inside its paint pipe, and a sealing element is fitted around the nozzle and located inside the return air chamber, when the tip of the spray needle blocks the spray nozzle's spray port, the sealing element blocks the connection between the return air pipe and the second cavity. This prevents paint from flowing back into the air duct from the return air pipe even when the spray bottle is tilted or the nozzle is placed upwards, thus avoiding damage to the motor and ensuring the spray gun can be used normally.

[0009] As an improvement, a first vent hole is provided on the side wall of the coating pipe, which is connected to the return air pipe. The sealing element can block the first vent hole to prevent communication between the return air pipe and the second cavity. With this structure, the design is simple, and the sealing element effectively seals the first vent hole.

[0010] As an improvement, the sealing element is a second sealing ring, which is fitted over the nozzle. This design simplifies the sealing element structure.

[0011] As an improvement, the gun head is equipped with a vent pipe connected to the air duct. The vent pipe is connected to the paint pipe and is also connected to the air inlet. This structure is simple, and the vent pipe can guide air from the air duct into the return air chamber.

[0012] As an improvement, one end of the vent pipe is connected to the paint pipe, and the other end is connected to the inner wall of the nozzle; a second vent hole is provided on the side wall of the vent pipe, and the second vent hole is interconnected with the air duct. With this structure, the vent pipe structure is simple.

[0013] As an improvement, the second vent is located on the side wall of the vent pipe away from the nozzle. With this structure, the second vent faces the airflow direction of the duct, resulting in better air intake.

[0014] As an improvement, a through hole is provided on the side wall of the nozzle, which is connected to the air pipe, and a plug is inserted into the through hole. With this structure, the internal passage can be cleared by opening the plug.

[0015] As an improvement, the nozzle is equipped with a spray bottle connector, and the spray bottle is connected to the spray bottle connector; the return air pipe passes through the spray bottle connector and communicates with the inner cavity of the spray bottle. This structure simplifies the design. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the nozzle of the handheld electric spray gun of this utility model.

[0017] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0018] Figure 3 This is a cross-sectional view of the nozzle of the handheld electric spray gun of this utility model from another angle.

[0019] Figure 4 This is a three-dimensional structural diagram of the nozzle of the handheld electric spray gun of this utility model.

[0020] The diagram shows: 1. Paint pipe, 2. Air duct, 3. Sprayer connector, 4. Spray needle, 5. Spray nozzle, 6. First sealing ring, 7. First cavity, 8. Second cavity, 9. Return air pipe, 10. First vent hole, 11. Second sealing ring, 12. Vent pipe, 13. Through hole, 14. Plug, 15. Second vent hole, 16. Third sealing ring, 17. Return air cavity, 18. Air inlet. Detailed Implementation

[0021] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0022] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.

[0023] It should also be understood that the terms “comprising,” “including,” “having,” and “containing”, when used in this specification, indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0024] like Figures 1 to 4 As shown, this application discloses a handheld electric spray gun, including a gun head 1 and a gun body. The tail of the gun head 1 is provided with a plug-in part, and the head of the gun body is provided with a plug-in interface. The plug-in part is detachably connected to the plug-in interface.

[0025] The gun head is equipped with a paint pipe 1 and an air duct 2. A spray bottle connector 3 is also provided on the gun head, with the open end of the spray bottle threaded onto the connector 3. A spray needle 4 is slidably fitted inside the paint pipe 1, and one end of the spray needle 4 can block the spray nozzle 5 on the gun head. A first sealing ring 6 is fitted around the spray needle 4, dividing the cavity inside the paint pipe 1 into a first cavity 7 and a second cavity 8. The first cavity 7 is connected to the spray nozzle 5 of the gun head.

[0026] The spray needle 4 is fitted with a third sealing ring 16, which is located within the second cavity 8. A return air chamber 17 is formed between the first sealing ring 6 and the third sealing ring 16. The return air chamber 17 is interconnected with the return air pipe 9. An air inlet 18, communicating with the air duct 2, is provided on the side wall of the return air chamber 17. A vent pipe 12, communicating with the air duct 2, is provided inside the nozzle. One end of the vent pipe 12 is connected to the paint pipe 1, and the vent pipe 12 is interconnected with the air inlet 18. The other end of the vent pipe 12 is connected to the inner wall of the nozzle. A second vent hole 15 is provided on the side wall of the vent pipe 12, communicating with the air duct 2. The second vent hole 15 is located on the side wall of the vent pipe 12 away from the nozzle. The gun head sidewall is provided with a through hole 13, which is connected to the air pipe 12, and a plug 14 is inserted into the through hole 13.

[0027] The spray needle 4 is further fitted with a sealing element located within the return air chamber 17. A first vent 10 is provided on the side wall of the paint pipe 1, and the first vent 10 communicates with the return air pipe 9. The sealing element is a second sealing ring 11, which is fitted around the spray needle 4. The second sealing ring 11 blocks the first vent 10, thereby preventing communication between the return air pipe 9 and the return air chamber 17.

[0028] In the operation of the handheld electric spray gun disclosed in this application, part of the airflow in the air duct 2 enters the air pipe 12 through the second vent 15, and then enters the return air chamber 17 of the paint pipe 1. At this time, the second sealing ring 11 separates from the first vent 10, and the airflow in the return air chamber 17 can enter the return air pipe 9, and then enter the spray bottle. This airflow can increase the air pressure in the spray bottle, forcing the paint out of the spray bottle and into the paint pipe 1 of the spray gun. When the spray gun is turned off, the second sealing ring 11 seals the first vent 10, thereby blocking the connection between the return air pipe 9 and the return air chamber 17. Even if the spray bottle is tilted or the nozzle is placed upward, the paint will not flow back into the return air chamber 17, which can effectively prevent the paint from entering the air duct 2 and burning out the motor, ensuring that the spray gun can be used normally.

[0029] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A handheld electric spray gun, comprising a nozzle, wherein a spray bottle is provided on the nozzle; a paint channel is provided inside the nozzle, a spray needle is slidably fitted inside the paint channel, a first sealing ring is fitted around the spray needle, the first sealing ring divides the cavity inside the paint channel into a first cavity and a second cavity, the first cavity being interconnected with the spray head of the nozzle. The gun head is internally provided with a back gas pipeline in communication with the inner cavity of the spray pot, the back gas pipeline is connected with the paint pipeline; the spray needle is externally provided with a third sealing ring, and the third sealing ring is located in the second cavity; a back gas cavity is formed between the first sealing ring and the third sealing ring; the back gas cavity is in communication with the back gas pipeline; the sidewall of the back gas cavity is provided with an air inlet in communication with the air duct; the spray needle is externally provided with a sealing member, and the sealing member is located in the back gas cavity; when the head of the spray needle blocks the spraying opening of the spray head, the sealing member blocks the communication between the back gas pipeline and the second cavity.

2. The hand-held electric spray gun of claim 1, wherein The sidewall of the paint pipeline is provided with a first air hole, the first air hole is in communication with the back gas pipeline, and the sealing member can block the first air hole to block the communication between the back gas pipeline and the second cavity.

3. The hand-held electric spray gun of claim 1, wherein The sealing member is a second sealing ring, and the second sealing ring is sleeved outside the spray needle.

4. The hand-held electric spray gun of claim 1, wherein The gun head is internally provided with an air pipeline in communication with the air duct, the air pipeline is connected with the paint pipeline, and the air pipeline is in communication with the air inlet.

5. The hand-held electric spray gun of claim 4, wherein One end of the air pipeline is connected with the paint pipeline, and the other end of the air pipeline is connected with the inner wall of the gun head; the sidewall of the air pipeline is provided with a second air hole, and the second air hole is in communication with the air duct.

6. The hand-held electric spray gun of claim 5, wherein The second air hole is arranged on the sidewall of the air pipeline away from the spray head.

7. The hand-held electric spray gun of claim 5, wherein The sidewall of the gun head is provided with a through hole, the through hole is in communication with the air pipeline, and a plug is inserted into the through hole.

8. The hand-held electric spray gun of claim 1, wherein The gun head is provided with a spray pot connecting seat, the spray pot is connected to the spray pot connecting seat, the back gas pipeline passes through the spray pot connecting seat and is in communication with the inner cavity of the spray pot.

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