Anti-backflow structure of electric spray gun

Abstract

The utility model discloses an anti-backflow structure of an electric spray gun, which comprises a gun body, a material pot is arranged on the gun body, the gun body is provided with a pressurizing component and an air duct, the pressurizing component and the air duct are coaxially arranged, the air duct is communicated with an air pipe connected into the material pot, and the air pipe is used for keeping air pressure balance between the gun body and the material pot. The end, in the material pot, of the air pipe penetrates through the buoyancy ball, and the buoyancy ball enables the tail end of the air pipe to be always located above the liquid level of the material pot. The buoyancy ball always floats on the liquid level of the material pot due to the buoyancy effect, so that the air pressure in the air pipe is always balanced with the air pressure above the liquid level of the material pot, liquid in the material pot is difficult to flow back into the gun body through the air pipe, the air pressure in the material pot and the air pressure in the air duct are consistent and are simultaneously increased and decreased, and the thickness of the liquid in a smearing area is uniform.

Description

Technical Field

[0001] This utility model relates to the field of electro-spray gun technology, and in particular to an anti-backflow structure for an electro-spray gun. Background Technology

[0002] Currently, commercially available electric spray guns are designed so that air is pressurized by a fan blade and guided to the gun body through an internal air duct. Within the air duct, most of the gas flows to the nozzle, where it diffuses and atomizes at the nozzle tip, simultaneously creating a low-pressure zone that siphons liquid. A small portion of the gas enters the material barrel through an air intake, pressurizing it. Under this pressure, the liquid enters the gun body through a central suction tube and flows to the nozzle tip for atomization. However, this design has a certain drawback: under abnormal use conditions (such as when the spray gun is tilted or inverted), liquid can flow back into the gun body through the air intake, subsequently clogging the nozzle and motor.

[0003] Existing technology, such as Chinese patent application CN203750739U, provides a "handheld electric spray gun" with a one-way valve on the air inlet pipe to prevent liquid from flowing back into the gun body through the air inlet pipe under abnormal use. However, after the one-way valve is used once, there will be high pressure in the barrel, while the air pressure inside the gun will quickly drop to the same level as atmospheric pressure. The pressure difference between the inside and outside will cause the one-way valve to close, making it difficult for air to be released. If it is restarted at this time, the air pressure in the barrel will force the liquid out first, while the air flow at the nozzle tip has not yet been established. The liquid will be sprayed out directly as a water jet, which is difficult to atomize, resulting in uneven liquid thickness in the sprayed area.

[0004] Therefore, it is necessary to propose a new type of anti-backflow structure for the electric spray gun to solve the aforementioned technical problems. Utility Model Content

[0005] To address the aforementioned problem that liquid in the container of an electric spray gun may flow back into the gun body and clog the nozzle and motor under abnormal use, this utility model provides an anti-backflow structure for an electric spray gun, including a gun body with a container on the gun body. A pressurizing component and an air duct are located inside the gun body, and the pressurizing component and air duct are coaxially arranged. An air pipe is provided on the air duct, connecting to the container. The air pipe is used to maintain air pressure balance between the air duct and the container. The air pipe has an end that communicates with the air inside the container. A buoyancy ball is provided on the portion of the air pipe inside the container, ensuring that the end of the air pipe is always above the liquid surface.

[0006] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0007] An air pipe is installed between the air duct and the material container to maintain air pressure balance between the two. A buoyancy ball is installed in the part of the air pipe that is in the material container, so that the end of the air pipe is always above the liquid surface in the material container. The air pressure in the air pipe is connected with the air pressure on the liquid surface in the material container. Under abnormal use of the electric spray gun, the liquid in the material container is difficult to flow back into the gun body through the air pipe. At the same time, it also makes the air pressure in the material container consistent with the air pressure in the gun body, rising and falling together, so that the liquid thickness in the coating area is uniform. Attached Figure Description

[0008] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0010] Figure 2 This is a schematic diagram of the internal structure of the gun.

[0011] Figure 3 This is a top view of the present invention.

[0012] Figure 4 for Figure 3 Sectional view at point A in the middle.

[0013] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0014] Figure 6 for Figure 3 Sectional view at point C.

[0015] Figure 7 This is a three-dimensional structural diagram of the motor and impeller.

[0016] In the picture:

[0017] Gun body (100); grip (101); vent pipe (102); liquid inlet pipe (103); battery (111); feed container (200); air pipe (300); end cap (301); buoyancy ball (400); switch (500); pressurization assembly (600); motor (601); impeller (602); air duct (700); spray chamber (701); needle plug (702); feed nozzle (703); suction pipe (711). Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0020] In this specification, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification, and does not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately varied depending on the orientation of the constituent elements being described. Therefore, the use of terms not limited to those described in the specification may be appropriately replaced as needed.

[0021] like Figure 1 As shown, an anti-backflow structure for an electro-spray gun includes a gun body 100, on which a feed container 200 is provided, such as... Figure 1 , Figure 2 As shown, the gun body 100 is provided with an air pipe 300 that connects to the material container 200. The air pipe 300 is used to maintain the air pressure balance between the gun body 100 and the material container 200, such as... Figure 2 As shown, the air pipe 300 has an end 301 that communicates with the air inside the container 200. The portion of the air pipe 300 located inside the container 200 is provided with a buoyancy ball 400 that floats on the liquid surface, and the buoyancy ball 400 ensures that the end 301 of the air pipe 300 is always above the liquid surface.

[0022] like Figure 1 , Figure 2 , Figure 5 As shown, the gun body 100 is provided with a pressurization component 600 and an air duct 700. The pressurization component 600 and the air duct 700 are coaxially arranged. The pressurization component 600 generates centrifugal pressurized air, which is blown into the air duct 700 to increase the air pressure in the air duct 700.

[0023] like Figure 1 , Figure 6 As shown, the gun body 100 is provided with a vent pipe 102 that connects to the air duct 700. The other end of the air pipe 300 is inserted into the vent pipe 102 and detachably connected to it. The detachable connection method can be a plug-in connection, a threaded connection, etc., which facilitates the removal of the air pipe 300 for cleaning or for replacement when the air pipe 300 is damaged. Figure 2 As shown, the end 301 of the air pipe 300 passes through the buoyancy ball 400, and connects the air pressure in the material pot 200 with the air pressure in the air duct 700. When the air pressure in the air duct 700 increases, the air pressure in the material pot 200 will increase accordingly.

[0024] like Figure 1 , Figure 2 As shown, the air tube 300 is a flexible air tube, and the buoyancy ball 400 needs to float up and down with the rise and fall of the liquid level in the container 200. The flexibility of the air tube allows the air tube 300 to bend accordingly when the buoyancy ball 400 floats up and down on the liquid surface without being excessively stretched or compressed, thereby ensuring that the opening of the end 301 of the air tube 300 is always above the liquid surface.

[0025] In this embodiment, the main function of the air pipe 300 is to connect the air duct 700 and the material container 200 so that the air pressure between the two can be connected. Therefore, in other embodiments, the material and shape of the air pipe 300 can be adjusted according to the actual situation to better adapt to the layout of the gun body 100 and the material container 200.

[0026] In this embodiment, the main function of the buoyancy ball 400 is to allow the air tube 300 to pass through and to allow air pressure to communicate between the container 200 and the air duct 700. In other embodiments, a float or buoy with a through hole can be used instead of the buoyancy ball 400, as long as it can keep the air tube 300 unobstructed and allow air pressure to pass through. Furthermore, if the design of the container 200 allows, the buoyancy ball 400 can even be completely removed, and the air tube 300 can be directly fixed at a certain position in the container 200, as long as this position can ensure that the end 301 of the air tube 300 is always above the liquid surface as the liquid level changes.

[0027] like Figure 2 , Figure 5 As shown, after the air is pressurized by the pressurization component 600, the pressurized air is guided into the air duct 700. In the air duct 700, most of the gas flows to the material nozzle 703, where it diffuses and atomizes at the tip of the nozzle 703, while simultaneously creating a low-pressure zone that siphons liquid. Figure 4 As shown, another small portion of the gas enters the container 200 through the gas pipe 300, pressurizing the container 200, such as... Figure 5 As shown, under pressure, the liquid enters the spray chamber 701 through the suction pipe 711 and flows to the front end of the material nozzle 703 for atomization.

[0028] In other embodiments, other suitable air booster devices may be used as appropriate, such as axial flow boosters, piston compressors, turbo compressors, and other different types of booster devices.

[0029] When the electro-spray gun is in an abnormal operating condition such as being tilted or inverted, the buoyancy ball 400 always floats above the liquid surface of the material tank 200 due to buoyancy. This ensures that the air pressure in the air pipe 300 is always connected with the air pressure above the liquid surface of the material tank 200, making it difficult for the liquid in the material tank 200 to flow back into the gun body 100 through the air pipe 300. At the same time, the air pressure in the material tank 200 is consistent with the air pressure in the air duct 700, rising and falling together, resulting in a uniform coating thickness.

[0030] like Figure 4-6 As shown, a spray chamber 701 is also provided in the air duct 700. The spray chamber 701 is used to contain the liquid pressurized from the material container 200. A needle plug 702 is slidably provided in the spray chamber 701. A material nozzle 703 is provided at the front end of the spray chamber 701. One end of the needle plug 702 is located in the material nozzle 703. The needle plug 702 slides toward the material nozzle 703 under the push of the liquid. The front end of the needle plug 702 and the material nozzle 703 together form a narrow gap. The liquid in the spray chamber 701 is atomized through the narrow gap on the material nozzle 703 under the action of high pressure air.

[0031] In this embodiment, the needle plug 702 slides under the pressure of the liquid, forming a narrow slit together with the material nozzle 703 for liquid atomization. In other embodiments, the needle plug 702 can be adjusted according to specific needs, such as a piston, slide valve, or other components that can form a narrow slit with the material nozzle 703; similarly, the nozzle 703 can also be adjusted accordingly based on the change of the needle plug 702.

[0032] like Figure 1 , Figure 4 , Figure 5 As shown, the gun body 100 is provided with a liquid passage pipe 103 that connects to the spray chamber 701. The end of the liquid passage pipe 103 away from the spray chamber 701 is detachably connected to a liquid suction pipe 711. The detachable connection method can be plug-in, threaded connection, etc., so that the liquid suction pipe 711 can be removed for cleaning or removed for replacement when the liquid suction pipe 711 is damaged. The end of the liquid suction pipe 711 away from the spray chamber 701 is connected to the material container 200. Under the action of high pressure air, the liquid in the material container 200 enters the spray chamber 701 through the liquid suction pipe 711.

[0033] like Figure 1 , Figure 5As shown, the liquid container 200 is detachably mounted on the gun body 100 and is located on the same side as the air duct 700, which facilitates the replacement and replenishment of the liquid in the liquid container 200. In this embodiment, a threaded connection is used, but in other embodiments, it can be any mechanism or device that can achieve a detachable connection, such as a buckle, quick-release connector, etc.

[0034] like Figure 1 As shown, the gun body 100 also includes a hand grip 101, which is convenient for the user to grip. The hand grip 101 is equipped with a removable battery 111. The removable battery allows the electric spray gun to have a longer service life. When one battery is used up, only one battery needs to be replaced to continue using it.

[0035] In other embodiments, the shape, material, and surface texture of the grip 101 can be optimized according to ergonomic principles. Possible alternatives include handles of different shapes and sizes, surface treatments with anti-slip textures, etc.

[0036] In other embodiments, the type, capacity, and voltage of battery 111 can be adjusted according to specific needs. Possible alternatives include different types of rechargeable batteries (such as lithium-ion batteries, nickel-metal hydride batteries, etc.), disposable batteries, or external power adapters.

[0037] like Figure 1 , Figure 7 As shown, the handle 101 is equipped with a switch 500 that can control the start and stop of the motor 601. By toggling the switch 500, the electric spray gun can be easily used or turned off. The switch 500 is electrically connected to the motor 601 to control the start and stop of the motor.

[0038] like Figure 2 , Figure 6 , Figure 7 As shown, the booster assembly 600 includes a motor 601 and an impeller 602 mounted on the motor output shaft. The motor 601 starts and drives the impeller 602 to rotate, generating high-pressure air. The high-pressure air generated by the impeller 602 can be blown towards the air duct 700.

[0039] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A backflow prevention structure for an electro-spray gun, comprising a gun body (100), wherein the gun body (100) is provided with a feed container (200), characterized in that: The gun body (100) is provided with an air pipe (300) that connects to the material container (200). The air pipe (300) is used to maintain the air pressure balance between the gun body (100) and the material container (200). The air pipe (300) has an end (301) that communicates with the air inside the container (200). The portion of the air pipe (300) located inside the container (200) is provided with a buoyancy ball (400) that floats on the liquid surface, and the buoyancy ball (400) ensures that the end (301) of the air pipe (300) is always above the liquid surface.

2. The anti-backflow structure of the electro-spray gun according to claim 1, characterized in that: The gun body (100) is provided with a pressurization component (600) and an air duct (700), which are coaxially arranged.

3. The anti-backflow structure of the electro-spray gun according to claim 2, characterized in that: The gun body (100) is provided with a vent pipe (102) that connects to the air duct (700). The end of the air pipe (300) away from the buoyancy ball (400) is inserted into the vent pipe (102) and is detachably connected to the vent pipe (102).

4. The anti-backflow structure of the electro-spray gun according to claim 1, characterized in that: The end (301) of the air pipe (300) passes through the buoyancy ball (400) and connects the air pressure in the container (200) with the air pressure in the air duct (700).

5. The anti-backflow structure of the electro-spray gun according to claim 2, characterized in that: The air duct (700) is also provided with a spray chamber (701), a needle plug (702) is slidably provided in the spray chamber (701), and a material nozzle (703) is provided at the front end of the spray chamber (701), with one end of the needle plug (702) located in the material nozzle (703).

6. The anti-backflow structure of the electro-spray gun according to claim 5, characterized in that: The gun body (100) is provided with a liquid passage pipe (103) that connects to the spray chamber (701). The end of the liquid passage pipe (103) away from the spray chamber (701) is detachably connected to a liquid suction pipe (711). The end of the liquid suction pipe (711) away from the spray chamber (701) is connected to the material container (200).

7. The anti-backflow structure of the electro-spray gun according to claim 2, characterized in that: The material container (200) is detachably mounted on the gun body (100) and is located on the same side as the air duct (700).

8. The anti-backflow structure of the electro-spray gun according to claim 2, characterized in that: The gun body (100) also includes a hand grip (101) which is provided with a removable battery (111).

9. The anti-backflow structure of the electro-spray gun according to claim 8, characterized in that: The grip (101) is provided with a switch (500) that can control the start and stop of the motor (601), and the switch (500) is electrically connected to the motor (601).

10. The anti-backflow structure of the electro-spray gun according to claim 2, characterized in that: The booster assembly (600) includes a motor (601) and an impeller (602) mounted on the output shaft of the motor (601), and the high-pressure air generated by the impeller (602) can be blown into the air duct (700).

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