A spray gun supply cup with a vent valve

Abstract

This invention provides a spray gun supply cup with a vent valve, comprising a cup body having a paint storage cavity. A vent structure and corresponding sealing element are provided at the bottom of the cup body. The vent structure connects to the paint storage cavity. A valve seat is arranged around the outer periphery of the vent structure, and a venting structure is arranged on the valve seat. The vent structure and the venting structure can communicate to form a venting path. The sealing element has a sealing part arranged between the vent structure and the valve seat, used to close or open the venting path. This invention utilizes the assembly gap formed between the venting structure and the sealing part, which widens the venting path and facilitates convenient control of opening and closing. Furthermore, the venting structure is simple to manufacture and can be adjusted according to working conditions; the sealing surface that mates with the venting structure only needs to be smooth, thereby reducing the manufacturing and improvement costs of the valve body. An anti-detachment structure prevents the sealing element from accidentally detaching in either a sealed or unsealed state, avoiding loss.

Description

Technical Field

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

[0002] At present, the spray gun mainly uses pneumatic method to atomize the paint for spraying, so it is necessary to supply paint to the spray gun. The more common method is to connect a paint supply cup to the spray gun. This method can ensure that the supply cup and the spray gun move at the same time, and the paint is continuously pressed into the spray gun by gravity, and then sprayed out after being atomized by compressed gas. During the working process, in addition to the effect of gravity, the compressed air in the spray gun also provides suction to the paint, and cooperates with the paint's own gravity to guide the paint into the spray gun.

[0003] The existing paint supply cup needs to use its own gravity to feed the paint into the spray gun. Generally, the paint supply cup is placed above the spray gun and often adopts a closed cup body, or at least a sealable cup body, to ensure that the paint does not spill during operation. However, during the operation of the paint supply cup in this form, as the paint decreases, the pressure inside and outside the cup will often become unbalanced, and the paint will become increasingly difficult to flow out. Therefore, a ventilation structure needs to be designed to maintain the pressure balance inside and outside the cup.

[0004] For example, Chinese patent document 200480041717.5 discloses a fluid reservoir for a paint spray gun, the fluid reservoir comprising a container (1) and a cover (2) that can be put on the container, the cover having a connector (3) for putting the fluid reservoir on the paint spray gun or an adapter, wherein the container (1) has a vent hole (4) that can be closed by means of a valve, characterized in that the valve comprises an intermediate housing (10) arranged on the container and a corresponding closing element (5), and has two valve seats arranged sequentially along the flow direction, wherein the closing element (5) can move relative to the valve housing (10) between a first valve position and a second valve position, in the first valve position, the vent hole (4) is closed, and in the second valve position, the pressure between the interior of the container (1) and the outside is balanced, and the closing element is fixed to the valve housing (10) at the first valve position and the second valve position by a locking element or a clamping mechanism.

[0005] In the above technical solution, it is often difficult to avoid paint overflow after the vent hole is opened and closed many times. The viscosity coefficient of the paint itself is high and it is easy to solidify. After solidifying around the ventilation structure, it is easy to block the vent hole or the switch valve, affecting the normal use of the spray gun. At the same time, structures such as the vent valve or the vent hole are often small in size, and are often difficult to clean after blockage occurs. Improper cleaning operations can easily damage the structure, affecting the service life of the spray gun supply cup. Therefore, it is necessary to improve the spray gun supply cup.

[0006] In addition, in the above technical solution, a locking element or a clamping mechanism is used for positioning at the first valve position and the second valve position, and specifically an annular rib and an annular groove are used to form a snap fit. After multiple switching operations between the first valve position and the second valve position, the annular rib is easily worn, resulting in a loss of positioning accuracy, or even a failure of the snap fit, thereby causing problems such as the opening and closing of the closing element being unstable, and the closing element being lost. Utility Model Content

[0007] The utility model aims to solve the above problems in the prior art and proposes a spray gun supply cup with a vent valve.

[0008] The purpose of the utility model can be achieved through the following technical solutions: a spray gun supply cup with a ventilation valve, comprising a cup body with a paint storage chamber, a ventilation structure and a corresponding sealing element are arranged at the bottom of the cup body, the ventilation structure is connected to the paint storage chamber, a valve seat is arranged around the periphery of the ventilation structure, a deflation structure is arranged on the valve seat, the ventilation structure and the deflation structure can be connected to form a ventilation path, the sealing element is provided with a blocking portion, the blocking portion is arranged between the ventilation structure and the valve seat, and is used to close the ventilation path or to open the ventilation path.

[0009] In the above-mentioned spray gun supply cup with a vent valve, the air release structure is a recessed notch provided on the inner peripheral wall of the valve seat, the valve seat has an internal chamber, and the recessed notch is connected to the vent structure through the internal chamber.

[0010] In the above-mentioned spray gun supply cup with a vent valve, the vent structure is a vent pipe, the vent pipe protrudes outward from the bottom of the cup body, the outer peripheral tube wall of the vent pipe forms a sealing surface one, the blocking part is a tube, the inner peripheral wall of the tube forms a sealing surface two, the tube is sleeved on the outer periphery of the vent pipe, and the sealing surface two fits with the sealing surface one to form a seal.

[0011] In the above-mentioned spray gun supply cup with a vent valve, a groove is arranged on the outer peripheral wall of the tube, the inner end of the groove is an open notch, and the groove cooperates with the concave notch to form an expansion vent.

[0012] In the above-mentioned spray gun supply cup with a vent valve, the vent structure is a vent hole arranged at the bottom of the cup body, the inner circumferential wall of the valve seat has a first sealing surface, the recessed notch is located on the outside of the first sealing surface, the blocking portion is a sealing column, the outer circumferential wall of the sealing column forms a second sealing surface, the sealing column extends into the valve seat, and the second sealing surface fits with the first sealing surface to form a seal.

[0013] In the above-mentioned spray gun supply cup with a vent valve, a valve housing is arranged around the outer periphery of the valve seat, and a paint storage chamber is formed between the valve housing and the valve seat.

[0014] In the above-mentioned spray gun supply cup with a vent valve, a sealing shell is provided on the sealing element around the outer periphery of the blocking portion, and the sealing shell is arranged on the outer periphery of the valve seat.

[0015] In the above-mentioned spray gun supply cup with a vent valve, the sealing element is connected to the bottom of the cup body through an anti-detachment structure; the sealing element is in the open position of the vent path, and the anti-detachment structure restricts the sealing element from completely detaching from the valve seat.

[0016] In the above-mentioned spray gun supply cup with a vent valve, the anti-detachment structure includes a circular hook arranged at the bottom of the cup body, and the two circular hooks are symmetrically arranged on both sides of the valve seat, and the circular hook has a limiting notch connected to the outside world. Two ring buckles are correspondingly arranged on the sealing element, and the ring buckle includes a U-shaped ring, and an axle rod is arranged in the opening of the U-shaped ring, and the axle rod is sleeved in the circular hook, and the diameter of the axle rod is larger than the width of the limiting notch.

[0017] In the above-mentioned spray gun supply cup with a vent valve, the anti-detachment structure includes a hook combination arranged at the bottom of the cup body, and the two hook combinations are symmetrically arranged on both sides of the valve seat. The hook combination includes hook one and hook two, and the hook one and the hook two are arranged opposite to each other to form a limiting opening. Two hook rings are correspondingly arranged on the sealing element, and the hook ring is sleeved on the hook one. The thickness of the hook ring is greater than the width of the limiting opening.

[0018] Compared with the prior art, the spray gun supply cup with a vent valve has the following beneficial effects:

[0019] 1. Design of the air-release structure: The air-release structure adopts a concave notch set on the inner wall of the valve seat, thereby forming an assembly gap between the concave notch and the blocking part, which can not only widen the ventilation path, but also facilitate the convenient control of opening and closing. In addition, the processing method of the air-release structure is simple and can be adjusted at any time according to the working conditions; the sealing surface matched with the air-release structure can be set smooth, thereby reducing the production and improvement costs of the valve body.

[0020] 2. Easy to clean: The sealing method on the outside of the ventilation structure is used for sealing, which does not rely on directly sealing the vents. When the ventilation structure is in an open state, the gas and paint do not pass through all the channels, but only through the exhaust structure. At this time, even if a blockage occurs, it is filled in the exhaust channel, which can prevent the paint from clogging the ventilation structure. When cleaning, the sealing element can be removed for cleaning, the cleaning range is small, and the cleaning method is more convenient.

[0021] 3. Different sealing methods:

[0022] Outer-wrapped sealing: The ventilation structure adopts a ventilation pipe, and the sealing part covers the outer wall of the ventilation pipe for sealing, forming a good sealing effect and facilitating closing and opening.

[0023] Insert seal: The ventilation structure adopts ventilation holes, and the sealing part is inserted into the valve seat to form a close fit with the inner wall, forming a good sealing effect and facilitating closing and opening.

[0024] Combined seal: The ventilation structure adopts a ventilation pipe, and the inner wall of the sealing part covers the outer wall of the ventilation pipe for sealing, and the outer wall of the sealing part fits the inner wall of the valve seat for sealing, that is, the two sealing forms of outsourcing and internal insertion are combined to further enhance the sealing effect.

[0025] 4. Innovation of anti-slip structure: By setting an anti-slip structure between the sealing element and the bottom of the cup body, the sealing element is effectively prevented from accidentally leaving the valve seat in a sealed or unsealed state, while ensuring that the sealing element controls the opening and closing of the ventilation structure, thereby avoiding loss. At the same time, the anti-slip structure adopts a lasso method, which avoids the problem of failure caused by long-term wear of the card-embedded method. Therefore, the lasso method can not only increase the anti-slip strength, but also avoid wear and tear, and extend the service life of the anti-slip.

[0026] In general, the utility model improves the performance and reliability of the vent valve by combining multiple structural designs and fully considering material selection and assembly methods, while simplifying the production process and reducing manufacturing costs. This has important practical significance for the use and maintenance of the spray gun supply cup. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a three-dimensional diagram of the overall structure of an embodiment of the present invention.

[0028] Figure 2 for Figure 1 A partial enlarged view of .

[0029] Figure 3 It is a three-dimensional diagram of a sealing element in one embodiment of the utility model.

[0030] Figure 4 This is a cross-sectional view of a closed state of an embodiment of the utility model.

[0031] Figure 5 This is a cross-sectional view of an embodiment of the utility model in an open state.

[0032] Figure 6 This is a three-dimensional diagram of the overall structure of another embodiment of the present utility model.

[0033] Figure 7 for Figure 6 A partial enlarged view of .

[0034] Figure 8 It is a three-dimensional diagram of a sealing element in another embodiment of the present invention.

[0035] Fig. 9 This is a cross-sectional view of another embodiment of the utility model in a closed state.

[0036] Fig.10 This is a cross-sectional view of another embodiment of the utility model in an open state.

[0037] In the figure, 1, cup body; 2, vent pipe; 2a, sealing surface one; 3, valve seat; 3a, recessed notch; 3b, first sealing surface; 4, sealing element; 5, tube; 5a, sealing surface two; 5b, groove; 6, sealing shell; 7, buckle; 7a, shaft; 8, round hook; 8a, limiting notch; 9, vent hole; 10, sealing column; 10a, second sealing surface; 11, valve shell; 12, hook one; 13, hook two; 14, limiting opening; 15, hook ring. DETAILED DESCRIPTION

[0038] 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.

[0039] like Figures 1 to 5 As shown, one embodiment is that the spray gun supply cup with a vent valve comprises a cup body 1 having a paint storage chamber, a vent structure and a corresponding sealing element 4 are provided at the bottom of the cup body 1, the vent structure is connected to the paint storage chamber, a valve seat 3 is arranged around the periphery of the vent structure, an air release structure is arranged on the valve seat 3, the vent structure and the air release structure can be connected to form a vent path, the sealing element 4 is provided with a blocking portion, the blocking portion is arranged between the vent structure and the valve seat 3, and is used to close the vent path or to open the vent path.

[0040] The cup body 1, the ventilation structure and the valve seat 3 are all made of plastic material to provide the material support strength of the cup body 1 and the assembly strength of the ventilation valve. The sealing element 4 can be made of plastic or rubber material. The plastic material can enhance the hardness of the sealing element 4, and the rubber material can improve the sealing performance of the sealing element 4.

[0041] The air release structure is a recessed notch 3a provided on the inner peripheral wall of the valve seat 3. The valve seat 3 has an internal chamber, and the recessed notch 3a is connected to the ventilation structure through the internal chamber. At least one recessed notch 3a is provided on the inner peripheral wall of the valve seat 3 along the circumferential direction. The recessed notch 3a can extend along the axial direction of the valve seat 3, and an assembly gap is formed with the blocking portion through the recessed notch 3a. When the blocking portion moves to a certain height, the recessed notch 3a is connected to the internal chamber, and the ventilation structure is connected to the internal chamber at the same time. Thus, a ventilation path is formed by the ventilation structure, the internal chamber and the recessed notch 3a, so that the paint storage chamber of the cup body 1 and the external air pressure are balanced.

[0042] The ventilation structure is a ventilation pipe 2, which protrudes outward from the bottom of the cup body 1. The outer peripheral tube wall of the ventilation pipe 2 forms a sealing surface 2a. The sealing part is a tube 5. The inner peripheral wall of the tube 5 forms a sealing surface 2a. The tube 5 is sleeved on the outer periphery of the ventilation pipe 2, and the sealing surface 2a 5a is fitted with the sealing surface 2a to form a seal.

[0043] The tube body structure is used as the air guide and sealing component of the ventilation structure. At the same time, the tube wall of the ventilation pipe 2 is used to form a baffle, so that a paint storage chamber is formed between the ventilation pipe 2 and the valve seat 3. When a small amount of paint is sprayed from the ventilation pipe 2 and flows into the internal chamber of the valve seat 3, storage is formed. The tube 5 is plugged in and out to form a transition fit with the ventilation pipe 2. The tube 5 is pressed down and sleeved on the ventilation pipe 2, and the ventilation path is cut off by the cooperation of the sealing surface to close the ventilation structure. The tube 5 is pulled up and separated from the ventilation pipe 2, so that an annular gap is formed between the sealing surface 1 2a and the sealing surface 2 5a, and a gap is formed between the outer periphery of the tube 5 and the recessed notch 3a to connect the ventilation path and open the ventilation structure.

[0044] A groove 5b is arranged on the outer peripheral wall of the tube 5, and the inner end of the groove 5b is an open notch. The groove 5b cooperates with the recessed notch 3a to form an expanded airway. At least one groove 5b is arranged on the outer peripheral wall of the tube 5 along the circumferential direction. The groove 5b extends along the axial direction of the tube 5. The open notch allows the groove 5b to be directly connected to the internal chamber of the valve seat 3. The groove 5b and the recessed notch 3a are arranged one by one, and the groove cavity of the groove 5b cooperates with the recessed notch 3a to increase the ventilation diameter, so as to facilitate efficient ventilation and prevent the paint from easily blocking the ventilation path.

[0045] A sealing shell 6 is arranged around the outer periphery of the sealing portion on the sealing element 4, and the sealing shell 6 is arranged on the outer periphery of the valve seat 3. When the sealing element 4 is buckled on the ventilation structure, the sealing shell 6 is buckled on the outer side of the valve seat 3, and the inner peripheral wall of the sealing shell 6 is in contact with the outer peripheral wall of the valve seat 3. The sealing shell 6 has a barrier effect, forms a seal on the outer side of the valve seat 3, increases the sealing effect, and prevents paint leakage.

[0046] The sealing element 4 is connected to the bottom of the cup body 1 via an anti-slip structure; the sealing element 4 is in the open position of the ventilation path, and the anti-slip structure restricts the sealing element 4 from completely separating from the valve seat 3 .

[0047] The anti-drop structure includes a circular hook 8 arranged at the bottom of the cup body 1, two circular hooks 8 are symmetrically arranged on both sides of the valve seat 3, the circular hook 8 has a limiting notch 8a connected to the outside, and two ring buckles 7 are correspondingly arranged on the sealing element 4. The sealing element 4 and the ring buckle 7 are integrally connected through a bending strip. When the sealing element 4 moves back and forth, the distance adjustment is achieved by stretching or bending the bending strip. The ring buckle 7 includes a U-shaped ring ring, and a shaft rod 7a is arranged in the opening of the U-shaped ring ring. The shaft rod 7a is sleeved in the circular hook 8, and the diameter of the shaft rod 7a is greater than the width of the limiting notch 8a.

[0048] The round hook 8 is made of plastic, and the ring buckle 7 of the sealing element 4 is made of rubber. During installation, the elasticity of the rubber is used to squeeze the shaft 7a from the limiting notch 8a into the round hook 8. The limiting notch 8a is designed to be slightly smaller than the shaft 7a to prevent the shaft 7a from easily coming out, ensuring the assembly connection of the sealing element 4 and preventing it from being lost.

[0049] The working principle of this implementation method:

[0050] During the paint spraying operation, the supply cup is inverted so that the paint drops due to gravity, and the sealing element 4 is pulled upward to move up along the valve seat 3. The sealing surface 2a 5a of the tube 5 is completely separated from the sealing surface 1a 2a of the vent pipe 2. The inner end of the tube 5 reaches the position of the recessed notch 3a, so that the vent pipe 2 and the recessed notch 3a are connected. The external gas passes through the recessed notch 3a of the valve seat 3 and the internal chamber, and enters the paint storage chamber of the cup body 1 from the vent pipe 2, so as to facilitate the smooth flow of paint into the spray gun.

[0051] When the sealing element 4 is pulled out, the buckle 7 is pulled upwards synchronously, and the round hook 8 restricts the buckle 7 and the sealing element 4 from being separated from the vent valve.

[0052] like Figures 6 to 10 As shown, the difference of another embodiment is that the ventilation structure is a ventilation hole 9 arranged at the bottom of the cup body 1, the inner wall of the valve seat 3 has a first sealing surface 3b, the recessed notch 3a is located on the outside of the first sealing surface 3b, the sealing portion is a sealing column 10, the outer wall of the sealing column 10 forms a second sealing surface 10a, the sealing column 10 extends into the valve seat 3, and the second sealing surface 10a fits with the first sealing surface 3b to form a seal.

[0053] The hole structure is used as the communication port of the ventilation structure, and the column structure is used to cooperate with the valve seat 3 to form a sealing structure. The sealing column 10 is plugged in and out to form a transitional fit with the valve seat 3. The sealing column 10 is pressed down to penetrate the bottom of the valve seat 3, and the ventilation path is cut off by the cooperation of the sealing surface to close the ventilation structure. The sealing column 10 is pulled up so that the bottom end of the sealing column 10 reaches at least the height of the concave notch 3a, and a gap is formed between the concave notch 3a and the sealing column 10 to connect the ventilation path and open the ventilation structure.

[0054] A valve housing 11 is arranged around the outer periphery of the valve seat 3, and a paint storage cavity is formed between the valve housing 11 and the valve seat 3. The valve housing 11 is a cylindrical structure, and the valve seat 3 is also a cylindrical structure, so that the paint storage cavity is an annular cavity. When the sealing element 4 is pulled out, under the action of the suction force, the paint inside the cup body 1 flows into the paint storage cavity through the vent hole 9, the internal cavity of the valve seat 3, and the concave notch 3a for storage.

[0055] A sealing shell 6 is arranged around the outer periphery of the sealing portion on the sealing element 4, and the sealing shell 6 is arranged on the outer periphery of the valve seat 3. When the sealing element 4 is buckled on the ventilation structure, the sealing shell 6 is buckled between the valve seat 3 and the valve housing 11. The sealing shell 6 has a blocking effect, forming a partition between the valve seat 3 and the valve housing 11, increasing the blocking effect and preventing paint leakage.

[0056] The anti-drop structure includes a hook assembly at the bottom of the cup body 1, two hook assemblies are symmetrically arranged on both sides of the valve seat 3, the hook assembly includes a hook 12 and a hook 2 13, the hook 12 and the hook 2 13 are arranged opposite to each other to form a limit opening 14, two hook rings 15 are correspondingly arranged on the sealing element 4, the sealing element 4 and the hook ring 15 are integrally connected through a bending strip, and when the sealing element 4 moves back and forth, the distance adjustment is achieved by stretching or bending the bending strip. The hook ring 15 is sleeved on the hook 12, and the thickness of the hook ring 15 is greater than the width of the limit opening 14.

[0057] The hook 12 and the hook 2 13 are made of plastic. The hook 1 of the hook 12 is bent downward, and the hook 2 of the hook 2 13 is bent horizontally. The height difference between the hook 2 and the hook 1 forms the width of the limit opening 14. The hook ring 15 of the sealing element 4 is made of rubber. During installation, the elasticity of the rubber is used to squeeze the hook ring 15 into the hook assembly from the limit opening 14. The limit opening 14 is designed to be slightly smaller than the hook ring 15 to prevent the hook ring 15 from easily falling out, ensuring the assembly connection of the sealing element 4 and preventing it from being lost.

[0058] The working principle of this implementation method:

[0059] During the paint spraying operation, the supply cup is inverted so that the paint drops due to gravity, and the sealing element 4 is pulled upward to move up along the valve seat 3. The second sealing surface 10a of the sealing column 10 is completely separated from the first sealing surface 3b of the valve seat 3, and the inner end of the sealing column 10 reaches the position of the recessed notch 3a, so that the vent 9 and the recessed notch 3a are connected, and the external gas passes through the recessed notch 3a and the internal chamber of the valve seat 3 and enters the paint storage chamber of the cup body 1 from the vent 9, so as to facilitate the paint to flow smoothly into the spray gun.

[0060] When the sealing element 4 is pulled out, the hook ring 15 is pulled upward simultaneously, and the hook ring 15 and the sealing element 4 are restricted from leaving the vent valve by the hook 12.

[0061] 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".

[0062] 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 spray gun supply cup with a vent valve, comprising a cup body with a paint storage chamber, a vent structure and a corresponding sealing element are provided at the bottom of the cup body, the vent structure is connected to the paint storage chamber, and is characterized in that: A valve seat is arranged around the periphery of the ventilation structure, and a deflation structure is arranged on the valve seat. The ventilation structure and the deflation structure can be connected to form a ventilation path. The sealing element is provided with a blocking portion, and the blocking portion is arranged between the ventilation structure and the valve seat, and is used to close the ventilation path or to open the ventilation path.

2. The spray gun supply cup with a vent valve as claimed in claim 1, characterized in that: The air release structure is a recessed notch provided on the inner peripheral wall of the valve seat. The valve seat has an internal chamber, and the recessed notch is connected to the air venting structure through the internal chamber.

3. The spray gun supply cup with a vent valve as claimed in claim 2, characterized in that: The ventilation structure is a ventilation pipe, which protrudes outward from the bottom of the cup body. The outer peripheral wall of the ventilation pipe forms a sealing surface one. The sealing part is a tube. The inner peripheral wall of the tube forms a sealing surface two. The tube is sleeved on the outer periphery of the ventilation pipe, and the sealing surface two fits with the sealing surface one to form a seal.

4. The spray gun supply cup with a vent valve as claimed in claim 3, characterized in that: A groove is arranged on the outer peripheral wall of the tube, the inner end of the groove is an open notch, and the groove cooperates with the concave notch to form an expansion airway.

5. The spray gun supply cup with a vent valve as claimed in claim 2, characterized in that: The ventilation structure is a ventilation hole arranged at the bottom of the cup body, the inner wall of the valve seat has a first sealing surface, the recessed notch is located on the outside of the first sealing surface, the blocking portion is a sealing column, the outer wall of the sealing column forms a second sealing surface, the sealing column extends into the valve seat, and the second sealing surface fits with the first sealing surface to form a seal.

6. The spray gun supply cup with a vent valve as claimed in claim 5, characterized in that: A valve housing is arranged around the outer periphery of the valve seat, and a paint storage cavity is formed between the valve housing and the valve seat.

7. The spray gun supply cup with a vent valve as claimed in claim 1, characterized in that: A sealing shell is arranged on the sealing element and surrounds the outer periphery of the blocking portion, and the sealing shell is arranged on the outer periphery of the valve seat.

8. The spray gun supply cup with a vent valve as claimed in claim 1, characterized in that: The sealing element is connected to the bottom of the cup body via an anti-slip structure; when the sealing element is in the open position of the ventilation path, the anti-slip structure restricts the sealing element from completely detaching from the valve seat.

9. The spray gun supply cup with a vent valve as claimed in claim 8, characterized in that: The anti-slip structure includes a circular hook arranged at the bottom of the cup body, two circular hooks are symmetrically arranged on both sides of the valve seat, the circular hook has a limiting notch connected to the outside world, and two ring buckles are correspondingly arranged on the sealing element, the ring buckle includes a U-shaped ring, an axle rod is arranged in the opening of the U-shaped ring, the axle rod is sleeved in the circular hook, and the diameter of the axle rod is greater than the width of the limiting notch.

10. The spray gun supply cup with a vent valve as claimed in claim 8, characterized in that The anti-slip structure includes a hook combination arranged at the bottom of the cup body, and two of the hook combinations are symmetrically arranged on both sides of the valve seat. The hook combination includes hook one and hook two, and the hook one and the hook two are arranged opposite to each other to form a limiting opening. Two hook rings are correspondingly arranged on the sealing element, and the hook ring is sleeved on the hook one. The thickness of the hook ring is greater than the width of the limiting opening.

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