Valve terminal non-return structure

Abstract

The utility model discloses a valve terminal non-return structure, and belongs to the technical field of pneumatic control. Comprising a confluence plate and a plurality of electromagnetic valves, and the electromagnetic valves are integrated on the confluence plate; the non-return structure is arranged on the exhaust port of the confluence plate, the non-return structure comprises a flexible sealing part with a ventilation slit, the flexible sealing part controls opening and closing of the ventilation slit through elastic deformation of the flexible sealing part, and when gas flows from the exhaust port of the electromagnetic valve to the exhaust port of the confluence plate, the ventilation slit is opened and closed. The flexible sealing part generates elastic deformation under the action of forward air pressure to open the ventilation slit, so that a one-way ventilation channel is formed; when gas flows from the exhaust port of the confluence plate to the exhaust port of the electromagnetic valve, the flexible sealing part is acted by reverse air pressure and closes the ventilation slit. The non-return structure is additionally arranged between the exhaust port of the electromagnetic valve and the exhaust port of the confluence plate, so that the phenomenon of gas backflow at the exhaust port of the confluence plate caused by external air pressure change is effectively avoided, and misoperation of an execution element caused by accidental airflow interference is prevented.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic control technology, specifically relating to a valve island check valve structure. Background Technology

[0002] A valve island typically consists of a manifold and multiple solenoid valves mounted on it. Currently, there are various specifications of solenoid valves on the market, such as three-position five-way center-venting solenoid valves and 2× two-position three-way center-sealing solenoid valves. These solenoid valves have the characteristic of having a working port and an exhaust port that are connected when not energized. During normal operation of the valve island, the gas discharged by the solenoid valve will be discharged into the external environment through the exhaust port of the manifold.

[0003] However, in practical applications, if the air pressure at the manifold exhaust port is higher than that at the solenoid valve exhaust port, the external gas may flow in reverse, that is, flow backward from the manifold exhaust port into the solenoid valve exhaust port, and further enter the actuator (such as cylinder or drive device) through the solenoid valve working port. This reverse flow phenomenon may cause the actuator to malfunction, affecting the normal operation and stability of the equipment. Summary of the Invention

[0004] This utility model addresses the aforementioned problems in the prior art by proposing a valve island check valve structure that prevents gas from flowing back from the exhaust port of the manifold to the solenoid valve.

[0005] This utility model can be achieved through the following technical solutions:

[0006] A valve island check valve structure, comprising:

[0007] A manifold and several solenoid valves are integrated on the manifold. Each solenoid valve has a solenoid valve inlet and a solenoid valve outlet. The manifold has a manifold inlet and a manifold outlet. The solenoid valve inlet is connected to the manifold inlet, and the solenoid valve outlet is connected to the manifold outlet.

[0008] A backflow preventer structure is provided on the exhaust port of the manifold. The backflow preventer structure includes a flexible sealing portion with a vent slit. The flexible sealing portion controls the opening and closing of the vent slit through its own elastic deformation.

[0009] When gas flows from the solenoid valve exhaust port to the manifold exhaust port, the flexible sealing part undergoes elastic deformation under positive air pressure, thereby opening the ventilation slit and forming a one-way ventilation channel.

[0010] When gas flows from the exhaust port of the manifold to the exhaust port of the solenoid valve, the flexible sealing part is subjected to reverse air pressure and closes the ventilation slit.

[0011] As a further improvement of this utility model, the mounting surface of the solenoid valve is fixed to the mounting surface of the manifold by fasteners, and a sealing gasket is provided between the solenoid valve and the manifold.

[0012] As a further improvement of this utility model, the sealing gasket has a plurality of upwardly protruding solenoid valve sealing parts, which are inserted into the solenoid valve exhaust port or the solenoid valve inlet port and sealed to the inner wall of the valve port.

[0013] As a further improvement of this utility model, the sealing gasket is provided with an overflow hole, and the air port between the solenoid valve and the manifold is connected through the overflow hole.

[0014] As a further improvement of this utility model, the check valve is configured as a one-way duckbill valve, which is located at the flow hole and inserted into the exhaust port of the manifold.

[0015] As a further improvement of this utility model, the one-way duckbill valve is composed of an integrally connected cylindrical part and a duckbill part, wherein the duckbill part forms the flexible sealing part, wherein...

[0016] The cylindrical part is sealed to the inner wall of the exhaust port of the manifold.

[0017] The two sides of the duckbill are configured as inclined sidewalls, and the two inclined sidewalls gradually approach each other from the air inlet end to the air outlet end and fit together at the air outlet end to form the ventilation slit.

[0018] As a further improvement of this utility model, when the check valve structure is set as a one-way duckbill valve, it can be integrated on the sealing gasket to form an integral structure, or it can be set separately from the sealing gasket, and the vent slit is set in a straight line.

[0019] As a further improvement of this utility model, the check valve is configured as a one-way cross valve, which is installed at the flow hole and separately from the sealing gasket. In this case, the vent slit is arranged in a cross shape and forms a petal structure as the flexible sealing part.

[0020] As a further improvement of this utility model, it also includes a mesh plate with multiple vent holes. When the anti-reverse structure and the sealing gasket are separately arranged, the sealing gasket presses the anti-reverse structure onto the manifold through the mesh plate.

[0021] As a further improvement of this utility model, the end of the ventilation slit is provided with a crack-stopping hole.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By adding a check valve structure between the solenoid valve exhaust port and the manifold exhaust port, the backflow of gas at the manifold exhaust port caused by changes in external air pressure is effectively avoided, thereby preventing the actuator from malfunctioning due to unexpected airflow interference and improving the stability and reliability of the system.

[0024] 2. The check valve structure can be set as a duckbill one-way valve. The duckbill one-way valve can be integrated into the sealing gasket to form an integral structure, or it can be assembled as a separate accessory. When the gas flows from the exhaust port of the solenoid valve to the exhaust port of the manifold, the airflow pushes open the duckbill part of the duckbill one-way valve and opens the vent slit to pass through smoothly. Conversely, if the gas in the exhaust port of the manifold flows backward, the duckbill part of the duckbill one-way valve closes under the action of air pressure to prevent the gas from passing through and play a check valve role.

[0025] 3. The check valve structure can be set as a plate-shaped cross-shaped one-way valve, in conjunction with a mesh plate with vent holes. When the gas from the solenoid valve exhaust port flows to the manifold exhaust port, the gas passes through the vent holes on the mesh plate and blows towards the vent slit of the petal-shaped structure, causing the cross-shaped vent slit to deform and open to allow the gas to pass through. Conversely, if the gas from the manifold exhaust port flows backward, the presence of the mesh plate causes the vent slit of the petal-shaped structure to deform and be blocked, always remaining closed to prevent the gas from passing through and thus playing a check valve role. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the valve island structure of this utility model;

[0027] Figure 2 This is a cross-sectional view of the valve island according to Embodiment 1 of this utility model;

[0028] Figure 3 This is a utility model Figure 2 A magnified view of a section at point A in the middle;

[0029] Figure 4 This is a schematic diagram of the sealing gasket structure in Embodiment 1 of this utility model;

[0030] Figure 5 This is a cross-sectional view of the sealing gasket in Embodiment 1 of this utility model;

[0031] Figure 6 These are cross-sectional views of Embodiments 2 and 4 of this utility model;

[0032] Figure 7 This is a utility model Figure 6 A magnified view of a section at point B in the middle;

[0033] Figure 8 This is a utility model Figure 6 A magnified view of a section at point C;

[0034] Figure 9This is a schematic diagram of the duckbill check valve in embodiments two and three of this utility model;

[0035] Figure 10 This is the utility model Figure 9 A schematic diagram of the bottom structure;

[0036] Figure 11 This is a cross-sectional view of the one-way duckbill valve in Embodiments 2 and 3 of this utility model;

[0037] Figure 12 This refers to the structural entity of the mesh plate in embodiments two, three, four, and five of this utility model;

[0038] Figure 13 This is a schematic diagram of the anti-tear collar in Embodiment 3 of this utility model;

[0039] Figure 14 This is a cross-sectional view of the anti-tear collar and the one-way duckbill valve assembled in Embodiment 3 of this utility model;

[0040] Figure 15 This is a schematic diagram of the one-way cross valve in embodiments four and six of this utility model;

[0041] Figure 16 This is a cross-sectional view of the one-way cross valve in Embodiment 5 of this utility model;

[0042] Figure 17 This is a schematic diagram of the one-way cross valve and the housing after assembly in Embodiment Six of this utility model;

[0043] Figure 18 This is the utility model Figure 15 A structural diagram from another perspective;

[0044] Figure 19 This is a cross-sectional view of the one-way cross valve and the housing after assembly in Embodiment Six of this utility model.

[0045] In the diagram, 100 is the manifold; 110 is the manifold air inlet; and 120 is the manifold exhaust outlet.

[0046] 200. Solenoid valve; 210. Solenoid valve inlet; 220. Solenoid valve outlet;

[0047] 300. Sealing gasket; 310. Flow hole; 320. Raised sealing rib;

[0048] 400. Duckbill one-way valve; 410. Cylindrical part; 420. Duckbill part; 430. Brim structure; 440. Tear-resistant collar; 441. Second brim structure; 442. Second cylindrical part; 443. Second duckbill part;

[0049] 500. One-way cross valve; 510. Housing; 511. Air vent; 512. Annular port;

[0050] 600. Ventilation slit; 610. Crack-stopping round hole;

[0051] 700, Mesh plate; 710, Ventilation holes. Detailed Implementation

[0052] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0053] Example 1

[0054] like Figures 1-5 As shown, Embodiment 1 provides a valve island check valve structure, including:

[0055] The manifold 100 is integrated with several solenoid valves 200. Each solenoid valve 200 is integrated on the manifold 100. Each solenoid valve 200 has a solenoid valve inlet 210 and a solenoid valve outlet 220. The manifold 100 has a manifold inlet 110 and a manifold outlet 120. The solenoid valve inlet 210 is connected to the manifold inlet 110, and the solenoid valve outlet 220 is connected to the manifold outlet 120.

[0056] A backflow preventer is installed on the exhaust port 120 of the manifold. The backflow preventer includes a flexible sealing part with a vent slit 600. The flexible sealing part controls the opening and closing of the vent slit 600 through its own elastic deformation.

[0057] When gas flows from the solenoid valve exhaust port 220 to the manifold exhaust port 120, the flexible sealing part undergoes elastic deformation due to the positive air pressure, opening the ventilation slit 600 and forming a one-way ventilation channel, allowing the gas to be discharged smoothly.

[0058] Conversely, when gas attempts to flow in the reverse direction from the manifold exhaust port 120 to the solenoid valve exhaust port 220, the reverse air pressure causes the flexible seal to close the vent slit 600, thereby preventing gas from flowing back into the solenoid valve 200 and even the actuator.

[0059] It should be noted that in the existing valve island design, if the air pressure at the manifold exhaust port 120 is higher than the air pressure at the solenoid valve exhaust port 220, the gas may flow back into the solenoid valve 200 and further affect the actuator, causing unnecessary action or malfunction.

[0060] In this embodiment, by adding a backflow prevention structure between the solenoid valve exhaust port 220 and the manifold exhaust port 120, the gas backflow phenomenon caused by external air pressure changes is effectively avoided, thereby preventing the actuator from malfunctioning due to unexpected airflow interference, and improving the stability and reliability of the system.

[0061] In other words, the check valve ensures that gas can only flow in a predetermined direction, reducing mutual interference between components within the system and enhancing the safety of the entire automated control system. This design not only solves the backflow problem but also simplifies the maintenance process because the check valve is easy to install and replace, helping to reduce the maintenance cost and complexity of the equipment.

[0062] Preferably, the mounting surface of the solenoid valve 200 is fixed to the mounting surface of the manifold 100 by fasteners. In order to enhance the sealing of this connection and prevent gas leakage, a special sealing gasket 300 is provided between the solenoid valve 200 and the manifold 100.

[0063] The sealing gasket 300 has flow holes 310, which precisely correspond to and connect the air ports between the solenoid valve 200 and the manifold 100, so that the gas can flow smoothly and unobstructed from the solenoid valve inlet 210 or exhaust port to the corresponding inlet or exhaust port of the manifold 100.

[0064] In addition, the sealing gasket 300 is provided with an annular raised sealing rib 320. The raised sealing rib 320 is arranged around the air port of the solenoid valve 200 and the manifold 100 to form a complete ring seal, further ensuring the sealing performance between the solenoid valve 200 and the manifold 100.

[0065] Furthermore, the sealing gasket 300 has multiple upwardly protruding sealing portions of the solenoid valve 200. The sealing portions of the solenoid valve 200 are inserted into the solenoid valve exhaust port 220 or the solenoid valve inlet port 210 and are sealed to the inner wall of the valve port. Through this tight fit, the sealing portions of the solenoid valve 200 and the inner wall of the valve port form a reliable sealing connection. This design not only effectively prevents gas leakage at the interface and improves the overall sealing performance of the system, but also simplifies the assembly process and enhances the stability between components.

[0066] Preferably, in this embodiment, the check valve structure is integrated on the sealing gasket 300 and forms an integral structure. Specifically, the design of the entire sealing gasket 300 not only includes the flow hole 310 for connecting the solenoid valve 200 and the air port of the manifold 100, but also integrates a flexible sealing part with a ventilation slit 600 as a check valve structure. This integrated design makes the sealing gasket 300 itself have both sealing and check valve functions, without the need to add an additional independent check valve accessory.

[0067] By integrating the check valve structure with the gasket 300 into a single component, the assembly process is simplified, the number of parts is reduced, and the risk of leakage that may arise from the connection of multiple components is significantly reduced.

[0068] Furthermore, this design also demonstrates significant advantages in manufacturing and subsequent maintenance:

[0069] 1. Simplified assembly: Since the check valve structure is integrated into the gasket 300, the gasket 300 only needs to be placed in place once during installation, avoiding the complicated assembly steps in the traditional split design;

[0070] 2. Reduced failure rate: By reducing the number of connection points between independent parts, the probability of failure due to loosening, misalignment or wear is reduced, thereby improving the reliability of the system.

[0071] 3. Cost savings: By reducing the need for additional parts, not only are material costs reduced, but assembly time is also shortened, further improving production efficiency.

[0072] Specifically, the structure of the check valve mechanism is explained as follows:

[0073] The check valve structure is configured to consist of an integrally connected cylindrical portion 410 and a duckbill portion 420, forming a one-way duckbill valve 400.

[0074] The cylindrical part 410 is integrated into the flow hole 310 of the sealing gasket 300 and inserted into the exhaust port 120 of the manifold, and is sealed to the inner wall of the exhaust port 120 of the manifold.

[0075] The two sides of the duckbill 420 are configured as inclined sidewalls 421. The two inclined sidewalls 421 gradually approach each other from the air inlet end to the air outlet end, and fit together at the air outlet end to form a straight ventilation slit 600.

[0076] Under normal operating conditions, gas flows out from the solenoid valve exhaust port 220, passes through the cylindrical part 410 and enters the duckbill part 420. Due to the pressure of the forward airflow, the duckbill part 420 is forced to expand outward, causing the two inclined side walls 421 to separate and form a one-way channel, allowing the gas to be discharged smoothly.

[0077] If the air pressure at the manifold exhaust port 120 is higher than that at the solenoid valve exhaust port 220, the gas attempting to flow in the reverse direction will encounter the closed duckbill 420. At this time, the inclined sidewalls 421 on both sides of the duckbill 420 will be tightly closed by the reverse air pressure, effectively blocking the backflow of gas and avoiding system failure or malfunction of actuators caused by backflow.

[0078] In addition, the inclined sidewalls 421 on both sides of the duckbill 420 have a small inclination angle so that the inclined sidewalls 421 have sufficient length to withstand greater air pressure and are not easily torn.

[0079] To further improve the tear resistance of the ventilation slit 600, a tear-stopping hole 610 is provided at the end of the ventilation slit 600. By setting the tear-stopping hole 610, the stress concentration generated at both ends after the ventilation slit 600 is blown open can be reduced, thereby playing a role in preventing tearing and improving the working air pressure range and service life of the anti-reverse structure.

[0080] In summary, by integrating the check valve structure onto the sealing gasket 300, Embodiment 1 enables the sealing gasket 300 to simultaneously achieve the functions of sealing and check valve operation. The overall structure is simple, easy to assemble, and low in cost.

[0081] Example 2

[0082] like Figures 6-12 As shown, the difference between Embodiment 2 and Embodiment 1 is that the check valve structure and the sealing gasket 300 in Embodiment 2 are set separately, and a separate one-way duckbill valve 400 is used as the check valve structure. The two structures are the same.

[0083] Since the one-way duckbill valve 400 in Embodiment 2 is a separate accessory, in order to improve its stability after installation, a mesh plate 700 with multiple vent holes 710 is added. The mesh plate 700 covers the air inlet end of the cylindrical part 410, and the sealing gasket 300 presses the anti-reverse structure onto the manifold 100 through the mesh plate 700.

[0084] The mesh plate 700 allows gas to pass through through the vent holes 710 distributed on it, ensuring that the solenoid valve 200 can exhaust smoothly. At the same time, it also limits the one-way duckbill valve 400, preventing the one-way duckbill valve 400 from being blown into the solenoid valve exhaust port 220 under the action of reverse air pressure.

[0085] In addition, the thickness and rigidity of the mesh plate 700 itself can compress the one-way duckbill valve 400, preventing the cap structure 430 of the one-way duckbill valve 400 from deforming or moving under air pressure, losing the compressing effect, and causing the entire one-way duckbill valve 400 to be blown out of place or even fall off the sealing surface under air pressure.

[0086] Example 3

[0087] like Figures 13-14 As shown, the difference between Embodiment 3 and Embodiment 2 is that Embodiment 3 adds a tear-resistant collar 440 to prevent the ventilation slit 600 of the one-way duckbill valve 400 from tearing.

[0088] Specifically, the tear-resistant collar 440 has a similar structure to the one-way duckbill valve 400. The tear-resistant collar 440 is integrally connected from top to bottom and has a second brim structure 441, a second cylindrical part 442, and a second duckbill part 443. The second cylindrical part 442 and the second duckbill part 443 form a cavity for the one-way duckbill valve 400 to be inserted. The second brim structure 441 abuts against the bottom surface of the brim structure 430 of the one-way duckbill valve 400.

[0089] In its natural state, the tear-resistant collar 440 and the one-way duckbill valve 400 do not interfere with each other. When the gas solenoid valve exhaust port 220 flows to the manifold exhaust port 120, the airflow passes through the ventilation slit 600 of the one-way duckbill valve 400. When the duckbill part 420 expands outward under the action of air pressure, it is blocked by the second duckbill part 443 of the tear-resistant collar 440, which reduces the outward expansion of the duckbill part 420 of the one-way duckbill valve 400, thereby preventing the ventilation slit 600 from tearing.

[0090] Example 4

[0091] like Figure 15 As shown, the difference between Embodiment 4 and Embodiments 1, 2, and 3 is that Embodiment 4 uses a different check valve structure, and it is separately set from the sealing gasket 300, as explained below:

[0092] Preferably, the check valve structure is a planar one-way cross valve 500, which is installed at the flow hole 310. Its vent slit 600 is arranged in a cross shape and forms a petal structure as a flexible sealing part.

[0093] Similarly, since the one-way cross valve 500 in Embodiment 4 is also a separate accessory, a mesh plate 700 is added. The sealing gasket 300 presses the one-way cross valve 500 through the mesh plate 700 to ensure that it will not be blown into the exhaust hole of the solenoid valve 200 due to air pressure.

[0094] Specifically, when the gas from the solenoid valve exhaust port 220 flows to the manifold exhaust port 120, the gas passes through the vent hole 710 on the mesh plate 700 and is blown toward the vent slit 600 of the petal structure, causing the cross-shaped vent slit 600 to deform and open, allowing the gas to pass through smoothly and be discharged outward along the manifold exhaust port 120.

[0095] Conversely, if the gas at the exhaust port 120 of the manifold flows backward, the presence of the mesh plate 700 causes the ventilation slit 600 of the petal structure to deform and be obstructed, thus keeping it closed and preventing backflow.

[0096] Example 5

[0097] like Figure 16As shown, the difference between Embodiment 5 and Embodiment 4 is that the one-way cross valve 500 in Embodiment 5 uses a sheet with thicker edges and thinner middle, and the edge position to the middle position is transitioned by a bevel to enhance the strength of the one-way cross valve 500 and avoid tearing.

[0098] Example 6

[0099] like Figures 17-19 As shown, the difference between Embodiment Six and Embodiment Four is that Embodiment Six omits the mesh plate 700 structure, and instead has an outer shell 510 covering the one-way cross valve 500. This outer shell 510 has several air holes 511 on the side facing the air inlet of the solenoid valve 200, and an annular opening 512 on the side facing the exhaust port 120 of the manifold.

[0100] The vent 511 is designed to allow gas flowing out of the solenoid valve 200 to pass through. The diameter of the annular opening 512 is smaller than the length of the vent slit 600 of the one-way cross valve 500, so that the vent slit 600 of the petal structure will not open to its maximum extent, thereby preventing tearing due to excessive deformation.

[0101] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. 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.

[0102] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0103] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0104] The technical solutions of the various embodiments of this utility model can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0105] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A valve island check valve structure, characterized in that, include: A manifold and several solenoid valves are integrated on the manifold. Each solenoid valve has a solenoid valve inlet and a solenoid valve outlet. The manifold has a manifold inlet and a manifold outlet. The solenoid valve inlet is connected to the manifold inlet, and the solenoid valve outlet is connected to the manifold outlet. A backflow preventer structure is provided on the exhaust port of the manifold. The backflow preventer structure includes a flexible sealing portion with a vent slit. The flexible sealing portion controls the opening and closing of the vent slit through its own elastic deformation. When gas flows from the solenoid valve exhaust port to the manifold exhaust port, the flexible sealing part undergoes elastic deformation under positive air pressure, thereby opening the ventilation slit and forming a one-way ventilation channel. When gas flows from the exhaust port of the manifold to the exhaust port of the solenoid valve, the flexible sealing part is subjected to reverse air pressure and closes the ventilation slit.

2. The valve island check valve structure according to claim 1, characterized in that, The mounting surface of the solenoid valve is fixed to the mounting surface of the manifold by fasteners, and a sealing gasket is provided between the solenoid valve and the manifold.

3. The valve island check valve structure according to claim 2, characterized in that, The sealing gasket has multiple upwardly protruding solenoid valve sealing portions, which are inserted into the solenoid valve exhaust port or the solenoid valve inlet port and sealed to the inner wall of the valve port.

4. The valve island check valve structure according to claim 2, characterized in that, The sealing gasket has an overflow hole, and the air port between the solenoid valve and the manifold is connected through the overflow hole.

5. The valve island check valve structure according to claim 4, characterized in that, The check valve is configured as a one-way duckbill valve, which is located at the flow passage and inserted into the exhaust port of the manifold.

6. A valve island check valve structure according to claim 5, characterized in that, The one-way duckbill valve consists of an integrally connected cylindrical part and a duckbill part, wherein the duckbill part forms the flexible sealing part. The cylindrical part is sealed to the inner wall of the exhaust port of the manifold. The two sides of the duckbill are configured as inclined sidewalls, and the two inclined sidewalls gradually approach each other from the air inlet end to the air outlet end and fit together at the air outlet end to form the ventilation slit.

7. A valve island check valve structure according to claim 5, characterized in that, When the check valve structure is set as a one-way duckbill valve, it can be integrated on the sealing gasket to form an integral structure, or it can be set separately from the sealing gasket, and the vent slit is set in a straight line.

8. A valve island check valve structure according to claim 4, characterized in that, The check valve is configured as a one-way cross valve, which is installed at the flow hole and is separate from the sealing gasket. At this time, the vent slit is arranged in a cross shape and the flexible sealing part forms a petal structure.

9. A valve island check valve structure according to claim 7 or 8, characterized in that, It also includes a mesh plate with multiple vent holes. When the anti-reverse structure and the sealing gasket are separately installed, the sealing gasket presses the anti-reverse structure onto the manifold through the mesh plate.

10. A valve island check valve structure according to claim 1, characterized in that, The end of the ventilation slit is provided with a crack-stopping hole.

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