Ventilation paint blocking valve and paint supply cup

Abstract

The utility model provides a ventilation paint blocking valve and a paint supply cup, which comprise a valve body and a corresponding sealing element, the valve body is provided with a through port used for being communicated with a paint storage containing cavity, the central axis of the through port forms a jet flow direction, the valve body is provided with a blocking part used for blocking the jet flow direction, the valve body is provided with a ventilation hole, and the ventilation hole is communicated with the sealing element. An included angle is formed between the central axis of the vent hole and the jet flow direction, a circulation gap is formed between the sealing element and the vent hole, a sealing face is arranged on the outer wall of the valve body, and the sealing element is attached to the sealing face to seal the circulation gap. The blocking part is arranged on the valve body in the jet flow direction, paint can be prevented from being directly jetted out of the valve body, meanwhile, the airflow direction and the jet flow direction are not overlapped due to the position and the deflection angle of the vent hole, and a zigzag jet flow path is further formed in cooperation with block arrangement of the paint storage cavity, the valve seat, the inner ring and the outer ring, so that the paint overflowing amount is remarkably reduced, and the service life of the valve body is prolonged. And the exterior of the cup body is kept clean, so that the service life of the supply cup is effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of container ventilation valves, and relates to a fluid storage device for a spray gun, in particular to a ventilation paint blocking valve and a paint supply cup. Background Art

[0002] Spray guns are widely used in auto body shops to repaint vehicles that have been repaired after an accident. In known spray guns, a liquid is contained in a reservoir attached to the spray gun, from which the liquid is fed to a nozzle. Upon emerging from the nozzle, the liquid is atomized and forms a spray with compressed air supplied to the nozzle.

[0003] The reservoir (also called fluid supply cup) generally refers to the paint spray cup. The fluid supply cup is used to store paint. When in use, the fluid supply cup is connected to the spray gun to spray the paint inside the fluid supply cup. In order to allow the paint to flow out of the paint spray cup smoothly, it is necessary to set a vent on the paint spray cup, and set an on-off valve on the vent. When the paint is sprayed, the vent is opened to balance the air pressure inside and outside the paint spray cup; when not spraying, the vent is closed to avoid overflow of the stored paint and cause loss and pollution.

[0004] For example, Chinese patent document 200480041717.5 discloses a fluid storage device for a paint spray gun, the fluid storage device comprising a container (1) and a cover (2) that can be put on the container, the cover having a connecting piece (3) for putting the fluid storage device on the paint spray gun or the adapter, wherein the container (1) has a vent hole (4) that can be closed by a valve. In order to make the valve in the fluid storage device have better sealing performance, the valve for closing the vent hole (4) has two valve seats arranged sequentially along the flow direction.

[0005] In the above technical solution, the air vent is located in the flow direction. When the closing element is pulled out, the paint is instantly sprayed due to the suction force. The paint is directly splashed from the air vent into the paint storage space and outside the container, causing the paint to easily leak out and cause contamination of the cup body. In addition, after multiple splashes, the paint storage space is quickly filled, and then it is easy to contaminate the operator's hands, which has an adverse effect on the painting work and shortens the service life of the container.

[0006] In the above technical solution, a cylindrical plug is directly inserted into the vent hole for sealing, which makes the cylindrical plug easily contaminated with paint, causing pollution and increasing the diameter of the cylindrical plug. In addition, the paint is sticky, which creates resistance to the insertion and removal of the cylindrical plug from the vent hole, affecting the operator's user experience, and even making it impossible to reliably seal the vent hole, increasing the risk of paint leakage. Utility Model Content

[0007] The utility model aims to solve the above problems in the prior art and proposes a ventilating paint blocking valve and a paint supply cup.

[0008] The objectives of the utility model can be achieved through the following technical solutions: a ventilated paint blocking valve, comprising a valve body and a corresponding closing element, the valve body having a through port for connecting to a paint storage chamber, the central axis of the through port forming a spray direction, the valve body being provided with a blocking portion for blocking the spray direction, the valve body being provided with an air vent, the central axis of the air vent forming an angle with the spray direction, a flow gap being arranged between the closing element and the air vent, a sealing surface being provided on the outer wall of the valve body, and the closing element being in contact with the sealing surface to close the flow gap.

[0009] In the above-mentioned ventilation paint-blocking valve, a valve seat is arranged on the periphery of the valve body, a paint storage chamber is arranged between the valve seat and the valve body, and the closing element can move relative to the valve seat between a first valve position and a second valve position. In the first valve position, the flow gap is closed; in the second valve position, the pressure between the flow gap and the outside is balanced, and the closing element and the valve seat are fixed to the first valve position or the second valve position by a locking structure.

[0010] In the above-mentioned ventilating paint-blocking valve, the closing element is a plug body having an inner ring and an outer ring, and an annular gap is formed between the inner ring and the outer ring; the inner ring is matched with the outer circumference of the valve body, and the inner circumference of the inner ring has an inner wall area one that is in contact with the valve body sealing surface and an inner wall area two that is separated from the vent hole; the outer ring is matched with the outer circumference of the valve seat, and the inner circumference of the outer ring has a wall area one that is in contact with the outer wall surface of the valve seat and a wall area two that is separated from the outer wall surface of the valve seat.

[0011] In the above-mentioned ventilation paint-blocking valve, at least one ventilation groove is arranged on the outer wall of the valve seat, and an air flow inlet and outlet channel is formed between the wall area 2 of the outer ring and the ventilation groove, and the air flow inlet and outlet channel is connected to the paint storage chamber through the annular gap.

[0012] In the above-mentioned ventilation paint-blocking valve, the shortest line from the center line of the ventilation groove to the center axis of the valve body is the ventilation normal line, and the angle between the ventilation normal line and the center axis of the ventilation hole is not less than 90°.

[0013] In the above-mentioned ventilation paint-blocking valve, the locking structure includes a convex edge arranged on the outer periphery of the valve seat, the first valve position is a first groove arranged in the middle part of the inner periphery of the outer ring, and the second valve position is a second groove arranged at the bottom of the inner periphery of the outer ring, and the convex edge cooperates with the first groove or the second groove.

[0014] In the above-mentioned vent paint blocking valve, the valve body includes a valve tube and a valve head that are integrally connected, the port of the valve tube is the through port, the sealing surface is arranged on the outer peripheral wall of the valve tube, the top of the valve head forms the blocking portion, the vent hole is arranged on the side wall of the valve head, the angle range of the included angle is 15° to 90°, and the maximum diameter of the valve head is smaller than the diameter of the valve tube.

[0015] In the above-mentioned ventilation paint-blocking valve, the valve head is any one of a cylindrical shell, a conical shell, and a hemispherical shell.

[0016] In the above-mentioned ventilation paint-blocking valve, the valve head is a semi-cylinder having a hollow chamber inside, and the ventilation hole is arranged on the plane side wall of the semi-cylinder, and the ventilation hole is connected to the hollow chamber.

[0017] A paint supply cup comprises a cup body with a paint storage chamber, wherein the cup body has a bottom wall, and the above-mentioned ventilation paint blocking valve is arranged on the bottom wall.

[0018] Compared with the prior art, the ventilated paint blocking valve and the paint supply cup have the following beneficial effects:

[0019] 1. Blocking and side spraying design: The valve body is provided with a blocking part in the jet direction, which helps to prevent the paint from spraying out directly from the valve body. At the same time, the position and deflection angle of the vent hole make the airflow direction and the jet direction not overlap. Further cooperate with the blocking setting of the paint storage chamber, valve seat, inner ring and outer ring to form a folded jet path, that is, the original straight jet path is changed into a curved jet path, thereby significantly reducing the amount of paint overflow, making it difficult for the paint storage chamber to be full, keeping the outside of the cup clean, and effectively extending the service life of the supply cup.

[0020] 2. Flow gap design: By arranging a flow gap between the closing element and the vent, and sealing the original element and the valve body through the sealing surface, that is, adopting a sealing method that does not directly block the vent, it avoids problems such as loose sealing or inconvenient operation caused by a large amount of paint on the sealing part, which helps to improve the user's operating comfort.

[0021] 3. Design of ventilation groove: ventilation groove is set on the outer wall of valve seat, and air inlet and outlet channels are formed through the ventilation groove to ensure ventilation path inside and outside the valve seat. The design scheme of ventilation normal line and ventilation hole angle makes the paint have a long tortuous path between ventilation groove and ventilation hole, which is conducive to the paint staying in valve body and paint storage cavity, and increases the difficulty of paint flowing to the outside of cup body, so as to reduce the amount of paint overflow.

[0022] 4. Design of the locking structure: The locking structure with convex edges and grooves is adopted, and the valve body is opened and closed by moving and positioning the closing element from the first valve position to the second valve position, thereby providing reliable positioning and switching functions.

[0023] In general, the design of the ventilation paint-blocking valve achieves effective control of the flow of paint through the clever configuration of multiple structures and angles, which not only ensures the ventilation effect but also reduces the amount of paint sprayed, and has relatively significant practicality and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a cross-sectional view of a closed state of an embodiment of the utility model.

[0025] Figure 2 This is a cross-sectional view of an embodiment of the utility model in an open state.

[0026] Figure 3 The utility model is an exploded three-dimensional structure diagram of an embodiment of the utility model.

[0027] Figure 4 This is a three-dimensional structural diagram of a sealing element according to an embodiment of the utility model.

[0028] Figure 5 This is a three-dimensional structural diagram of a paint supply cup according to an embodiment of the utility model.

[0029] Figure 6 This is a cross-sectional view of another embodiment of the utility model in a closed state.

[0030] Figure 7 This is a cross-sectional view of another embodiment of the utility model in an open state.

[0031] Figure 8 This is an exploded three-dimensional structural diagram of another embodiment of the utility model.

[0032] In the figure, 1, valve body; 1a, valve tube; 1a1, opening; 1a2, sealing surface; 1b, valve head; 1b1, blocking part; 1b2, vent; 2, flow gap; 3, closing element; 3a, inner ring; 3b, outer ring; 3b1, first groove; 3b2, second groove; 4, valve seat; 4a, ventilation groove; 4b, convex edge; 5, paint storage chamber; 6, cup body; 6a, bottom edge; Y, jet direction. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] like Figures 1 to 5As shown, the ventilating paint blocking valve comprises a valve body 1 and a corresponding closing element 3, the valve body 1 has a through opening 1a1 for communicating with a paint storage chamber, the central axis of the through opening 1a1 forms a spray direction Y, a blocking portion 1b1 for blocking the spray direction Y is arranged on the valve body 1, a vent hole 1b2 is arranged on the valve body 1, the central axis of the vent hole 1b2 forms an angle with the spray direction Y, a flow gap 2 is arranged between the closing element 3 and the vent hole 1b2, a sealing surface 1a2 is arranged on the outer wall of the valve body 1, and the closing element 3 fits the sealing surface 1a2 to close the flow gap 2.

[0035] The valve body 1 is specifically a cylindrical structure with a hollow chamber, one end of the cylindrical structure is a through opening 1a1, and the other end is a closed end to form a blocking portion 1b1. Usually, the cylindrical structure of the valve body 1 is perpendicular to the cavity wall of the paint storage cavity, so that the paint in the paint storage cavity can flow directly into the hollow cavity of the valve body 1. Due to the opening position of the vent hole 1b2, there is a turning angle between the air flow direction and the jet direction Y, that is, the air flow direction and the jet direction Y do not overlap, and when the paint is sprayed along the jet direction Y, it is intercepted by the blocking portion 1b1 to avoid the paint from being sprayed directly. The deflection of the passage formed by the slanted setting of the vent hole 1b2 can not only ensure the ventilation effect, but also form a folded paint spraying path, effectively reducing the amount of paint sprayed.

[0036] like Figures 1 to 3 As shown, a valve seat 4 is provided on the periphery of the valve body 1, and a paint storage chamber 5 is arranged between the valve seat 4 and the valve body 1. The closing element 3 can move relative to the valve seat 4 between a first valve position and a second valve position. In the first valve position, the flow gap 2 is closed; in the second valve position, the pressure between the flow gap 2 and the outside is balanced, and the closing element 3 and the valve seat 4 are fixed to the first valve position or the second valve position by a locking structure.

[0037] The first valve position is a fixed point position where the closing element 3 blocks the valve body 1. When the closing element 3 is buckled to the first valve position, the paint in the paint storage chamber enters the hollow chamber of the valve body 1, is intercepted by the blocking portion 1b1, and can only reach the flow gap 2 through the vent hole 1b2, and is finally intercepted by the fitting position of the closing element 3 and the sealing surface 1a2 of the valve body 1. When the closing element 3 is buckled to the second valve position, the paint in the paint storage chamber enters the hollow chamber of the valve body 1, is intercepted by the blocking portion 1b1, and can reach the flow gap 2 through the vent hole 1b2. At this time, the closing element 3 is separated from the sealing surface 1a2 of the valve body 1, and the paint can flow from the separation gap to the paint storage chamber 5.

[0038] like Figure 4As shown, the closing element 3 is a plug body having an inner ring 3a and an outer ring 3b, and an annular gap is formed between the inner ring 3a and the outer ring 3b; the inner ring 3a is matched with the outer periphery of the valve body 1, and the inner periphery of the inner ring 3a has an inner wall area 1 that is in contact with the sealing surface 1a2 of the valve body 1 and an inner wall area 2 that is separated from the vent hole 1b2; the outer ring 3b is matched with the outer periphery of the valve seat 4, and the inner periphery of the outer ring 3b has a wall area 1 that is in contact with the outer wall surface of the valve seat 4 and a wall area 2 that is separated from the outer wall surface of the valve seat 4.

[0039] The plug body has a circular top wall, and the circular top wall is concentrically provided with an inner ring 3a and an outer ring 3b. The inner ring 3a forms a sleeve fit with the valve body 1, and the valve body 1 is sealed by the inner wall area 1 close to the sealing surface 1a2, and the inner wall area 2 is used to form a flow gap 2 around the outer periphery of the valve body 1, that is, the vent hole 1b2 is not blocked. The outer ring 3b forms a sleeve fit with the valve seat 4, and the wall area 1 is used to realize the sleeve assembly with the valve seat 4, and the gap between the wall area 2 and the outer wall of the valve seat 4 forms an airflow inlet and outlet channel.

[0040] like Figures 1 to 3 As shown, at least one ventilation groove 4a is provided on the outer wall of the valve seat 4, and an air flow inlet and outlet channel is formed between the wall area 2 of the outer ring 3b and the ventilation groove 4a, and the air flow inlet and outlet channel is connected to the paint storage chamber 5 through the annular gap.

[0041] The outer wall of the valve seat 4 is axially concave to form a ventilation groove 4a. Specifically, two ventilation grooves 4a are symmetrically arranged on the left and right. The ventilation grooves 4a are used to make a gap on the outer circumference of the valve seat 4 to achieve a gap between the valve seat 4 and the inner wall of the outer ring 3b, thereby ensuring that there is a ventilation path inside and outside the valve seat 4. When the closing element 3 is in the second valve position, the inside of the valve body 1 is connected with the outside world.

[0042] In addition, a through groove may be concavely provided on the inner periphery of the outer ring 3 b , that is, the groove wall of the through groove is the wall surface area 2 , thereby also realizing that a ventilation path is provided inside and outside the valve seat 4 .

[0043] The shortest line from the center line of the ventilation groove 4a to the center axis of the valve body 1 is the ventilation normal line, and the angle between the ventilation normal line and the center axis of the ventilation hole 1b2 is not less than 90°.

[0044] When two ventilation grooves 4a are symmetrically arranged, the ventilation hole 1b2 is arranged at the middle position between the two ventilation grooves 4a, so that the angle between the ventilation normal line and the central axis of the ventilation hole 1b2 is 90°. When one ventilation groove 4a is arranged, the ventilation hole 1b2 is arranged in the opposite direction of the ventilation groove 4a, so that the angle between the ventilation normal line and the central axis of the ventilation hole 1b2 is 180°. By designing the scheme of increasing the angle as much as possible, after the paint flows from the ventilation hole 1b2 to the paint storage chamber 5, it still needs to pass through as long a path as possible before it can flow out from the ventilation groove 4a, that is, by increasing the flow path of the paint as much as possible, the difficulty of the paint flowing out is increased, so that the paint is retained in the paint storage chamber 5, and the outside of the valve seat 4 is kept clean.

[0045] like Figures 1 to 3 As shown, the locking structure includes a convex edge 4b ​​arranged on the outer periphery of the valve seat 4, a first groove 3b1 is arranged in the middle of the inner periphery of the outer ring 3b at the first valve position, and a second groove 3b2 is arranged at the bottom of the inner periphery of the outer ring 3b at the second valve position, and the convex edge 4b ​​cooperates with the first groove 3b1 or the second groove 3b2.

[0046] The convex edge 4b ​​is embedded in the first groove 3b1 or the second groove 3b2 by the interference, forming a clamping part for positioning the closing element 3. When the convex edge 4b ​​is embedded in the first groove 3b1, by applying an upward external force to the closing element 3, the convex edge 4b ​​is separated from the first groove 3b1 and enters the second groove 3b2, so that the valve body 1 is in the open state, that is, the ventilation path is unblocked. When the convex edge 4b ​​is embedded in the second groove 3b2, by applying a downward external force to the closing element 3, the convex edge 4b ​​is separated from the second groove 3b2 and enters the first groove 3b1, so that the valve body 1 is in the closed state, that is, the ventilation path is cut off.

[0047] In addition, the convex edge 4b ​​can also be set on the inner periphery of the outer ring 3b, and the first groove 3b1 and the second groove 3b2 can be set at the lower and upper positions of the outer periphery of the valve seat 4, which can also achieve the function of closing the first valve position and opening the second valve position.

[0048] like Figure 3 As shown, the valve body 1 includes a valve tube 1a and a valve head 1b which are integrally connected. The port of the valve tube 1a is a through port 1a1. A sealing surface 1a2 is arranged on the outer peripheral wall of the valve tube 1a. The top of the valve head 1b forms a blocking portion 1b1. A vent hole 1b2 is arranged on the side wall of the valve head 1b. The angle range of the included angle is 15° to 90°. The maximum diameter of the valve head 1b is smaller than the diameter of the valve tube 1a.

[0049] The valve body 1 is a variable diameter cylinder structure. The valve tube 1a and the valve head 1b have the same central axis. The extension direction of the central axis is the jet direction Y. The valve head 1b is capped at the end to block the jet direction Y. The vent hole 1b2 is arranged on the side wall of the valve head 1b so that the opening is not set on the central axis, thereby forming a certain angle with the jet direction Y. On the premise of ensuring gas circulation, the paint is prevented from being sprayed in a straight line. When the central axis of the vent hole 1b2 is perpendicular to the jet direction Y, the best paint leakage prevention effect is achieved. By reducing the diameter of the valve head 1b, a flow gap 2 is left between the side wall of the valve head 1b and the inner ring 3a to avoid blocking the vent hole 1b2.

[0050] The valve head 1b can adopt various shapes, which are described as follows:

[0051] In one solution, the valve head 1b is any one of a cylindrical shell, a conical shell, and a hemispherical shell.

[0052] The valve head 1b is a cylindrical shell, the top plane of the cylindrical shell is the blocking part 1b1, and the cylindrical shell has a vent 1b2 on the arc side wall. The valve head is a conical shell, the top plane of the conical shell is the blocking part 1b1, and the conical shell has a vent 1b2 on the conical side wall. The valve head is a hemispherical shell, the top spherical area of ​​the hemispherical shell is the blocking part 1b1, and the hemispherical shell has a vent 1b2 on the side spherical area. The above three valve head structures can all achieve linear blocking of paint spraying, and set the vent 1b2 at the side position to avoid directly facing the jet direction Y. Only three common valve head structures are listed, but they are not limited to the above examples.

[0053] like Figures 6 to 8 As shown, another scheme is that the valve head 1b is a semi-cylinder, the interior of the semi-cylinder has a hollow chamber, and a vent hole 1b2 is arranged on the plane side wall of the semi-cylinder, and the vent hole 1b2 is connected to the hollow chamber. The semi-circular plane at the top of the semi-cylinder is a blocking part 1b1, and a gap is formed through the plane side wall, which realizes the arrangement of the vent hole 1b2 and provides a flow gap 2 between the vent hole 1b2 and the inner ring 3a by using the gap space.

[0054] like Figure 5 As shown, a further optimized embodiment is a paint supply cup, comprising a cup body 6 having a paint storage chamber, wherein the cup body 6 has a bottom wall, and the above-mentioned ventilation paint blocking valve is arranged on the bottom wall.

[0055] The bottom wall of the cup body 6 is a flat plate body, and a through hole 1a1 is opened on the bottom wall. The valve body 1 is fixedly connected to the through hole 1a1 and placed outside the cup body 6. The valve seat 4 is fixedly connected to the bottom wall and placed outside the cup body 6. The valve seat 4 is concentrically arranged with the valve body 1. The bottom wall periphery extends downwardly to a bottom edge 6a. When the closing element 3 closes the valve body 1, the height of the closing element 3 is flush with the bottom edge 6a; when the closing element 3 opens the valve body 1, the height of the closing element 3 exceeds the bottom edge 6a. Therefore, the opening and closing state of the valve body 1 can be clearly judged according to the height position of the closing element 3, so as to avoid forgetting to close the valve body 1 and causing paint leakage.

[0056] The working principle of this paint supply cup is:

[0057] The cup body 6 storing paint is installed on the paint spray gun. When the paint spraying operation is performed, the cup body 6 is tilted and inverted. At this time, the closing element 3 is located at the first valve position to close the valve body 1. The closing element 3 is pulled up to the second valve position by manpower to open the valve body 1. At the moment of opening, the suction force drives the paint in the cup body 6 to instantly spray in a straight line along the jet direction Y of the valve body 1, and the blocking part 1b1 blocks most of the paint from flowing back. The remaining small part of the paint flows into the paint storage chamber 5 through the vent hole 1b2 to be retained. When too much paint accumulates in the paint storage chamber 5, a small amount of paint will overflow from the paint storage chamber 5 through the vent groove 4a to the outside of the cup body 6. When the closing element 3 is located at the second valve position, the ventilation path is opened at the same time, and the outside air enters the paint storage chamber of the cup body 6. The balance of internal and external pressures allows the paint to flow smoothly into the paint spray gun for spraying.

[0058] After the spraying operation is completed, the closing element 3 is pressed to the first valve position to reclose the valve body 1 to prevent the paint in the paint storage chamber from flowing out of the vent hole 1b2.

[0059] The specific embodiments described herein are merely examples of the spirit of the utility model. A person skilled in the art of the utility model may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but will not deviate from the spirit of the utility model or exceed the defined scope. Although the utility model is described and described in detail in the drawings and the foregoing description, such descriptions and descriptions are considered to be illustrative or exemplary rather than restrictive. It should be understood that within the scope of the following claims, changes and modifications may be made by a person of ordinary skill. Specifically, the utility model covers additional embodiments having any combination of features from the above-mentioned different embodiments. In terms of the use of the expression "generally" or "substantially", this patent application should be understood to disclose that these features and values ​​are also fully satisfied, that is, there is no aforementioned characterization as "generally" or "substantially".

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A ventilating paint-blocking valve, comprising a valve body and a corresponding closing element, wherein the valve body has a through opening for communicating with a paint storage chamber, It is characterized in that The central axis of the through opening forms a jet direction, a blocking portion for blocking the jet direction is arranged on the valve body, a vent is arranged on the valve body, the central axis of the vent forms an angle with the jet direction, a flow gap is arranged between the closing element and the vent, a sealing surface is arranged on the outer wall of the valve body, and the closing element fits against the sealing surface to close the flow gap.

2. The ventilating paint blocking valve according to claim 1, It is characterized in that A valve seat is arranged on the periphery of the valve body, and a paint storage cavity is arranged between the valve seat and the valve body. The closing element can move relative to the valve seat between a first valve position and a second valve position. In the first valve position, the flow gap is closed; in the second valve position, the pressure between the flow gap and the outside is balanced, and the closing element and the valve seat are fixed to the first valve position or the second valve position by a locking structure.

3. The ventilating paint blocking valve according to claim 2, It is characterized in that The closing element is a plug body having an inner ring and an outer ring, and an annular gap is formed between the inner ring and the outer ring; the inner ring is matched with the outer circumference of the valve body, and the inner circumference of the inner ring has an inner wall area 1 that is in contact with the valve body sealing surface and an inner wall area 2 that is separated from the vent hole; the outer ring is matched with the outer circumference of the valve seat, and the inner circumference of the outer ring has a wall area 1 that is in contact with the outer wall surface of the valve seat and a wall area 2 that is separated from the outer wall surface of the valve seat.

4. The ventilating paint blocking valve according to claim 3, It is characterized in that At least one ventilation groove is arranged on the outer wall of the valve seat, and an air flow inlet and outlet channel is formed between the wall area 2 of the outer ring and the ventilation groove, and the air flow inlet and outlet channel is connected to the paint storage chamber through the annular gap.

5. The ventilating paint blocking valve according to claim 4, It is characterized in that The shortest line from the center line of the ventilation groove to the center axis of the valve body is the ventilation normal line, and the angle between the ventilation normal line and the center axis of the ventilation hole is not less than 90°.

6. The ventilating paint blocking valve according to claim 3, It is characterized in that The locking structure includes a convex edge arranged on the outer periphery of the valve seat, a first groove is arranged in the middle of the inner periphery of the outer ring at the first valve position, and a second groove is arranged at the bottom of the inner periphery of the outer ring at the second valve position, and the convex edge cooperates with the first groove or the second groove.

7. The ventilating paint blocking valve according to claim 1, It is characterized in that The valve body includes a valve tube and a valve head that are integrally connected, the port of the valve tube is the through port, the sealing surface is arranged on the outer peripheral wall of the valve tube, the cap of the valve head forms the blocking portion, the vent is arranged on the side wall of the valve head, the angle range of the included angle is 15° to 90°, and the maximum diameter of the valve head is smaller than the diameter of the valve tube.

8. The ventilating paint blocking valve according to claim 7, It is characterized in that The valve head is any one of a cylindrical shell, a conical shell and a hemispherical shell.

9. The ventilating paint blocking valve according to claim 7, It is characterized in that The valve head is a semi-cylinder having a hollow chamber inside. The vent hole is arranged on the plane side wall of the semi-cylinder, and the vent hole is connected to the hollow chamber.

10. A paint supply cup, comprising a cup body having a paint storage chamber, It is characterized in that The cup body has a bottom wall, and the bottom wall is provided with a ventilation paint blocking valve as described in any one of claims 1 to 9.

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