A seal control structure for a valve and a valve device

Abstract

The application discloses a sealing control structure for a valve and a valve device. The sealing control structure for the valve comprises a sealing assembly and a one-way conducting assembly, wherein the sealing assembly and the one-way conducting assembly are integrally formed; the sealing assembly can be arranged between a detachable end cover and an end portion of a valve body, and is used for filling and sealing a gap between the detachable end cover and the valve body; at least a part of the one-way conducting assembly can be accommodated in a second channel, and is used for controlling fluid in a first channel to enter the second channel and blocking fluid in the second channel from flowing back to the first channel. The sealing control structure can avoid the gas in a driving cavity from flowing back to an air inlet port, thereby avoiding the overflow problem, and effectively maintaining the stability of a pilot pressure.

Description

Technical Field

[0001] This invention relates to the field of control equipment technology, and in particular to a sealing control structure for valves and a valve device. Background Technology

[0002] Currently, in valve devices with an internal pilot structure, a connecting pipe can be provided on the valve body to connect the inlet port and the drive chamber at the end of the valve body. Gas is then introduced into the drive chamber through the inlet port and the connecting pipe to drive the piston located in the drive chamber and the valve core connected to the piston. When the valve core is displaced to the point where all ports are simultaneously connected (the inlet port is simultaneously connected to all working ports and all exhaust ports), due to the pressure difference between the working ports and the exhaust ports, the pressure at the inlet port drops sharply. This causes the gas in the drive chamber to flow back to the inlet port, resulting in overflow. This leads to a decrease in pilot pressure, preventing the valve core from switching to the corresponding position. Summary of the Invention

[0003] In view of this, the technical problem to be solved by the present invention is to provide a sealing control structure and valve device for a valve. The sealing control structure can prevent the gas in the drive chamber from flowing back to the inlet port, thereby avoiding the overflow problem and effectively maintaining the stability of the pilot pressure, thereby ensuring that the valve core can be stably switched to the corresponding position.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] In a first aspect, the present invention provides a sealing control structure for a valve, wherein the valve includes a valve body, a detachable end cap fixed to an end of the valve body, a drive chamber disposed on the end cap and facing the interior of the valve body, a first channel disposed inside the valve body, and a second channel disposed on the detachable end cap, the first channel and the second channel being connected to communicate between the air inlet port of the valve body and the drive chamber, thereby enabling a pilot valve to drive the main valve in the valve through a pilot pressure. The sealing control structure includes a sealing assembly and a one-way conduction assembly, wherein...

[0006] The sealing assembly and the unidirectional conduction assembly are integrally formed;

[0007] The sealing assembly can be disposed between the removable end cap and the valve body end to fill and seal the gap between the removable end cap and the valve body;

[0008] At least a portion of the unidirectional conduction component may be accommodated in the second channel for controlling the fluid in the first channel to enter the second channel and preventing the fluid in the second channel from flowing back into the first channel.

[0009] Optionally, the unidirectional guiding assembly includes a duckbill valve and a connecting portion integrally formed with the open end of the duckbill valve, wherein,

[0010] The connecting part is integrally formed with the sealing assembly;

[0011] The duckbill valve can be accommodated within the second channel.

[0012] Optionally, the connecting portion is a thin sheet with a central hole, wherein,

[0013] The central hole corresponds to the opening of the duckbill valve;

[0014] The sheet fills a specific area of ​​the sealing assembly, wherein the specific area of ​​the sealing assembly corresponds to the sidewall of the air outlet of the first channel and the sidewall of the air inlet of the second channel.

[0015] Optionally, if a sealing groove is provided on the side wall of the removable end cap and / or the side wall of the valve body end,

[0016] The shape of the sealing component matches the sealing groove.

[0017] Optionally, if a sealing groove is provided on the side wall of the removable end cap and / or the side wall of the valve body end,

[0018] The thickness of the sheet is less than the thickness of the sealing assembly.

[0019] Optionally, the sealing assembly and the unidirectional conduction assembly are made of an elastic material.

[0020] In a second aspect, embodiments of the present invention provide a valve device, comprising: a valve and the sealing control structure described in the first aspect embodiment and related embodiments.

[0021] The technical solution of the first aspect of the above invention has the following advantages or beneficial effects:

[0022] In the sealing control structure provided by the present invention, a sealing component is disposed between the removable end cap and the valve body end to fill and seal the gap between the removable end cap and the valve body, thereby achieving a seal between the removable end cap and the valve body end. At the same time, by having at least a portion of the one-way conduction component housed in the second channel of the removable end cap, the one-way conduction component can control the fluid in the first channel to enter the second channel and prevent the fluid in the second channel from flowing back into the first channel. That is, when the pressure at the air inlet port of the valve body decreases, causing a decrease in the pressure in the first channel, the one-way conduction component can also prevent the fluid in the drive chamber from flowing back, so as to avoid overflow and pilot pressure reduction, thereby ensuring that the valve core can be stably switched to the corresponding position so that the valve can work normally.

[0023] In addition, the integrated design of the sealing component and the unidirectional conduction component allows for better sealing and control of the pilot pressure. Furthermore, since the unidirectional conduction component is relatively small, its separate installation is not only cumbersome but also difficult to control. The integrated design allows the larger sealing component and the unidirectional conduction component to be installed and replaced more conveniently and easily as a whole. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of a valve provided according to existing technology;

[0025] Figure 2 This is a schematic diagram of a sealing control structure for a valve provided according to an embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional schematic diagram of a valve device according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram showing the relative relationship between the unidirectional conduction component and the second channel according to an embodiment of the present invention;

[0028] Figure 5A This is a cross-sectional schematic diagram of a unidirectional conduction component in a conducting state according to an embodiment of the present invention;

[0029] Figure 5B This is a cross-sectional schematic diagram of a unidirectional conduction component in a closed state according to an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of a duckbill valve provided according to an embodiment of the present invention.

[0031] The attached figures are labeled as follows:

[0032] 10-Valve; 11-Valve body; 111-Inlet port; 112-One working port; 113-Another working port; 114-One exhaust port; 115-Another exhaust port; 12-Removable end cap; 13-Drive chamber; 14-First channel; 15-Second channel; 16-Main valve; 17-Valve core assembly; 18-Pilot valve; 20-Sealing control structure; 21-Sealing assembly; 22-One-way conduction assembly; 221-Duckbill valve; 222-Connection. Detailed Implementation

[0033] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0034] like Figure 1 The valve 10 shown includes a pilot valve structure. Specifically, the valve 10 may include a valve body 11, a removable end cap 12 fixed to the end of the valve body 11, a drive chamber 13 disposed on the end cap and facing the interior of the valve body 11, a first channel 14 disposed inside the valve body 11, and a second channel 15 disposed on the removable end cap 12. The first channel 14 and the second channel 15 are connected to connect the air inlet port 111 of the valve body 11 and the drive chamber 13, so that the pilot valve 18 in the valve 10 drives the main valve 16 in the valve 10 through the pilot pressure.

[0035] Furthermore, such as Figure 1 As shown, in addition to the aforementioned valve body 11, detachable end cap 12, drive chamber 13, first channel 14, second channel 15, and pilot valve 18, valve 10's main valve 16 may include a valve core assembly 17 disposed within the valve body. Furthermore, besides the air inlet port 111, valve body 11 also includes two working ports 112 and 113 (112 represents one of the two working ports, and 113 represents the other working port), and two exhaust ports 114 and 115 (114 represents one of the two exhaust ports, and 115 represents the other exhaust port). The valve 10 operates by reciprocating through the valve core assembly 17 of the main valve 16. Specifically, by adjusting the two working positions of the valve core assembly 17, the communication relationship between the air inlet port 111 and the two working ports 112 and 113, as well as the two exhaust ports 114 and 115, is controlled to achieve… Figure 1 The two five-way connectors shown are worth noting. Figure 1 The two-position five-way structure shown is merely an example illustrating one valve structure to which the sealing control structure provided in the embodiment of the present invention is applicable.

[0036] Furthermore, it is understood that, in order to help those skilled in the art better understand the application of the sealing control structure provided in the embodiments of the present invention in a valve, the embodiments of the present invention only exemplarily illustrate and describe some key structures of the valve. Other unillustrated or undescribed structures, such as valve core, valve seat, coil, guide sleeve, return spring, and rear cover assembly, are all indispensable parts of the valve and can be obtained by those skilled in the art based on the disclosed valve structures. Therefore, the embodiments of the present invention do not limit the internal structure of the valve body and the detachable end cover, etc.

[0037] Furthermore, the pilot valves involved in the various embodiments of the present invention all refer to pilot valves disposed within valves or valve devices.

[0038] In addition, any valve or valve device that includes a valve body, a detachable end cap fixed to the end of the valve body, a drive chamber disposed on the end cap and facing the inside of the valve body, a first channel disposed inside the valve body, and a second channel disposed on the detachable end cap, wherein the first channel and the second channel are connected to connect the air inlet port of the valve body and the drive chamber, and realize that the pilot valve drives the main valve through pilot pressure, is applicable to the sealing control structure provided in the embodiments of the present invention and is within the protection scope of the present invention.

[0039] Understandably, the valves suitable for the sealing control structure can be existing valves with internal pilot structures, such as gate valves, spool valves with cross-flow design, and other internal pilot pneumatic solenoid valves. The accompanying drawings of the valves involved in the embodiments of the present invention are merely illustrative of one valve structure and do not limit the structure of the valves to which the sealing control structure is applicable.

[0040] Specifically, for internal pilot solenoid valves with cross-flow design, when the valve core assembly or the valve core of the internal pilot valve moves to the middle position during reciprocating motion, the intake port, exhaust port, and working port will all be connected, resulting in overflow. This will cause the air pressure at the intake port to drop, thereby causing a decrease in the pilot pressure and leading to problems in the regulation of internal pilot solenoid valves with cross-flow design.

[0041] To address the issue of reduced pilot pressure caused by overflow, this invention provides a sealing control structure 20 for valves. This sealing control structure 20 can prevent fluid backflow in the drive chamber, thereby maintaining stable pressure in the drive chamber when overflow occurs, and ensuring that the internal pilot valve can be properly regulated.

[0042] Figure 2 and Figure 3 A sealing control structure 20 for valve 10 according to an embodiment of the present invention is shown. Wherein, Figure 2 This is a perspective view of the sealing control structure 20. Figure 3 A cross-sectional view of the sealing control structure 20 applied to valve 10. (See Figure 2 and...) Figure 3As shown, the sealing control structure 20 may include: a sealing assembly 21 and a one-way conduction assembly 22, wherein,

[0043] The sealing assembly 21 and the one-way conduction assembly 22 are integrally formed;

[0044] The sealing assembly 21 can be disposed between the removable end cap 12 and the end of the valve body 11 to fill and seal the gap between the removable end cap 12 and the valve body 11.

[0045] At least a portion of the unidirectional conduction component 22 may be accommodated in the second channel 15 for controlling the flow of fluid in the first channel 14 into the second channel 15 and preventing the flow of fluid in the second channel 15 back into the first channel 14.

[0046] The integral molding of the sealing component 21 and the one-way conduction component 22 means that the sealing component 21 and the one-way conduction component 22 are installed or applied in the valve as a whole structure. The sealing component 21 and the one-way conduction component 22 can be made into a whole during the manufacturing process by means of mold making or other existing integral molding technology, or they can be combined into a whole by means of fastening such as bonding or fusion.

[0047] Wherein, at least a portion of the unidirectional conduit component 22 can be accommodated in the second channel 15, meaning that at least a portion of the unidirectional conduit component 22 extends into the second channel 15 from the communication opening of the second channel 15 provided on the side of the removable end cap 12, and a portion of the annular outer wall of the unidirectional conduit component 22 is fitted against the inner wall of the second channel 15, so that the portion of the annular outer wall of the unidirectional conduit component 22 and the inner wall of the second channel 15 form a seal, preventing fluid from flowing back into the first channel 14 or leaking out through the gap between the outer wall of the unidirectional conduit component 22 and the inner wall of the second channel 15. Simultaneously, a gap is formed between the remaining outer wall of the unidirectional conduit component 22 and the inner wall of the second channel 15, so that when the fluid pressure flowing into the second channel 15 from the first channel 14 decreases, the fluid in the second channel 15 can use the pressure difference to seal the end of the unidirectional conduit component 22 that enters the second channel 15, thereby preventing fluid in the second channel from flowing back through the unidirectional conduit component 22. In a preferred embodiment, as shown... Figure 4 As shown, for the unidirectional guiding component 22 located in the second channel 15, the annular outer wall near the communication port of the second channel 15 is in contact with the inner wall of the corresponding second channel 15. This can prevent the fluid from flowing back into the first channel 14 from the gap between the outer wall of the unidirectional guiding component 22 and the inner wall of the second channel 15, and can also reduce the resistance of the unidirectional guiding component 15 to the fluid entering the second channel 15 from the first channel 14.

[0048] Furthermore, one end of the unidirectional conduit 22 extending into the second channel 15 can be an elastically adjustable deformable structure capable of opening and closing based on a pressure difference, thereby controlling the fluid in the first channel 14 to enter the second channel 15 and preventing the fluid in the second channel 15 from flowing back into the first channel 14. The specific implementation of this elastically adjustable deformable structure at one end of the unidirectional conduit 22 based on a pressure difference can be as follows: Figure 5A and Figure 5B As shown. Among them, as Figure 5A As shown, under normal pilot pressure, because the fluid in the second channel 15 is supplied to the drive chamber 13, the drive chamber 13, driven by the fluid, increases in size, dispersing the pressure P2 of the fluid in the second channel. This results in the pressure P1 of the fluid entering the second channel 15 from the first channel 14 being generally greater than the pressure P2 of the fluid in the second channel 15. Therefore, when P1 is greater than P2, P1 can open one end of the unidirectional guide assembly 22 that enters the second channel 15, thus opening the unidirectional guide assembly 22 and allowing fluid to enter the second channel 15 through the unidirectional guide assembly 22. Figure 5B As shown, at the instant the pilot pressure decreases, the pressure of the fluid entering the second channel 15 from the first channel 14 drops from P1 to P3. Generally, P3 is less than P2. While the pressure of the fluid in the second channel 15 remains at P2, since P2 is greater than P3, P2 can compress the end of the unidirectional conduit 22 that enters the second channel 15, thus closing the end of the unidirectional conduit 22 that enters the second channel 15. This causes the unidirectional conduit 22 to block the passage between the second channel 15 and the first channel 14, thereby blocking the fluid passage and preventing overflow, effectively ensuring the stability of the pilot pressure.

[0049] Therefore, the sealing control structure provided in this embodiment of the invention uses a sealing component disposed between the removable end cap and the valve body end to fill and seal the gap between the removable end cap and the valve body, thereby achieving a seal between the removable end cap and the valve body end. At the same time, since at least a portion of the one-way conduction component is accommodated in the second channel of the removable end cap, the one-way conduction component can control the fluid in the first channel to enter the second channel and prevent the fluid in the second channel from flowing back into the first channel. That is, when the pressure at the air inlet port of the valve body decreases, causing the pressure in the first channel to decrease, the one-way conduction component can also prevent the fluid in the drive chamber from flowing back, so as to avoid overflow and pilot pressure reduction, thereby ensuring that the valve can work normally.

[0050] In addition, the integrated design of the sealing component and the unidirectional conduction component allows for better sealing and control of the pilot pressure. Furthermore, since the unidirectional conduction component is relatively small, its separate installation is not only cumbersome but also difficult to control. The integrated design allows the larger sealing component and the unidirectional conduction component to be installed and replaced more conveniently and easily as a whole.

[0051] In embodiments of the present invention, such as Figure 2 , Figure 5A , Figure 5B as well as Figure 6 As shown, the unidirectional conduction component 22 provided in this embodiment of the invention may include: a duckbill valve 221 and a connecting portion 222 integrally formed with the open end of the duckbill valve 221, wherein,

[0052] The connecting part 222 and the sealing component 21 are integrally formed;

[0053] The duckbill valve 221 can be accommodated within the second channel 15.

[0054] Specifically, the connection portion 222 and the sealing component 21 are integrally formed as a single unit without a clear boundary. However, the presence of the connection portion 222 facilitates the formation of an integral structure between the sealing component 21 and the duckbill valve 221. Specifically, the connection portion 222 includes through holes corresponding to the first channel 14 and the second channel 15, and the open end of the duckbill valve 221 is integrally connected to the edge of the through hole. Furthermore, the combination of the duckbill valve 221 and the connection portion 222 effectively ensures the sealing performance at the connection point between the first channel 14 and the second channel 15.

[0055] It is worth noting that one end of the duckbill valve 221 is an open structure (i.e., the open end), and the other end is an elastically deformable flat structure, which serves to close the valve. When the pressure of the fluid entering the duckbill valve 221 from the open end is greater than the pressure on the outer wall of the duckbill valve 221, the elastically deformable flat structure becomes an open structure. When the pressure of the fluid entering the duckbill valve 221 from the open end is less than the pressure on the outer wall of the duckbill valve 221, the open structure reverts to a flat structure, thus blocking the fluid passage.

[0056] The duckbill valve 221 has a simple structure and low cost, and can be easily integrated with the sealing assembly 21. In addition, by providing the connecting part 222, a specific angle can be formed between the duckbill valve and the sealing assembly 21 to meet the valve's requirements.

[0057] Specifically, such as Figure 2 and Figure 6As shown, the connecting portion 222 can be a thin sheet structure with a central hole, where the central hole corresponds to the opening of the duckbill valve 221. The thin sheet fills a specific area of ​​the sealing assembly 21, where the specific area of ​​the sealing assembly 21 corresponds to the side wall of the air outlet of the first channel 14 and the side wall of the air inlet of the second channel 15. The side wall of the air outlet of the first channel 14 refers to the area surrounding the connection opening of the first channel 14 located on the side of the valve body 11 (the side of the valve body 11 corresponds to the side of the removable end cap 12); the side wall of the air inlet of the second channel 15 refers to the area surrounding the connection opening of the second channel 15 located on the side of the removable end cap 12 (the side of the removable end cap 12 corresponds to the side of the valve body 11). The connecting portion 222 secures the duckbill valve to the sealing assembly 21 and seals the connection between the first channel 14 and the second channel 15, further improving the stability of the pilot pressure and the valve's sealing performance.

[0058] In this embodiment of the invention, to facilitate the installation of the sealing assembly, some existing valves may have sealing grooves provided on the sidewalls of the removable end cap 12 and / or the end wall of the valve body 11. With this design, the shape of the sealing assembly 21 can be matched to the sealing groove to achieve a sealing effect.

[0059] In this embodiment of the invention, in existing valve devices, sealing grooves are provided for the sidewalls of the removable end cap 12 and / or the end sidewalls of the valve body 11. However, grooves corresponding to the connecting portion 222 may not be provided around the communication port of the second channel 15 on the sidewall of the removable end cap 12 or around the communication port of the first channel 14 on the sidewall of the valve body 11. In this case, the thickness of the sheet is less than the thickness of the sealing assembly 21. This allows the connecting portion to better seal the areas around the communication ports of the second channel 15 and the first channel 14 in existing valve devices, enabling the sealing control structure provided in this application to be more widely used.

[0060] Furthermore, regarding the structure in which grooves corresponding to the connecting portion 222 are provided for the area surrounding the communication port of the second channel 15 on the side wall of the detachable end cap 12 and the area surrounding the communication port of the first channel 14 on the side wall of the end of the valve body 11, the thickness of the connecting portion 222 can be set accordingly based on the depth of the groove.

[0061] In this embodiment of the invention, the sealing component 21 and the one-way conduction component 22 can be made of elastic materials. This is to better seal the valve and enable the one-way conduction component 22 to better achieve one-way conduction control through elastic deformation. Elastic materials refer to materials that deform under external force and quickly return to their original shape after the force is removed, while also possessing sealing properties, such as rubber, latex, and resin materials.

[0062] like Figure 3 As shown, an embodiment of the present invention provides a valve device, which may include: a valve 10 and a sealing control structure 20 provided in any of the above embodiments.

[0063] In this valve device, a sealing assembly of a sealing control structure is provided between the removable end cap and the valve body end, and a one-way flow assembly is provided in the second channel of the removable end cap. The sealing assembly is used to fill and seal the gap between the removable end cap and the valve body to achieve a seal between the removable end cap and the valve body end. At the same time, the one-way flow assembly controls the fluid in the first channel to enter the second channel and prevents the fluid in the second channel from flowing back into the first channel. That is, when the pressure at the air inlet port of the valve body decreases, causing the pressure in the first channel to decrease, the one-way flow assembly can also prevent the fluid in the drive chamber from flowing back to avoid overflow and pilot pressure reduction, thereby ensuring that the valve can work normally.

[0064] In addition, the integrated design of the sealing component and the unidirectional conduction component allows for better sealing and control of the pilot pressure. Furthermore, since the unidirectional conduction component is relatively small, its separate installation is not only cumbersome but also difficult to control. The integrated design allows the larger sealing component and the unidirectional conduction component to be installed and replaced more conveniently and easily as a whole.

[0065] The above steps are provided only to help understand the method, structure, and core ideas of this invention. Those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A seal control structure for a valve, characterized by, The valve is a two-position five-way structure with an inner pilot electromagnetic valve; the valve (10) comprises a valve body (11), a detachable end cover (12) fixed to the end of the valve body (11), a driving cavity (13) arranged on the end cover and towards the inside of the valve body (11), a first channel (14) arranged in the inside of the valve body (11), and a second channel (15) arranged in the detachable end cover (12), the first channel (14) and the second channel (15) are communicated to connect the gas inlet port (111) of the valve body (11) and the driving cavity (13), so as to realize that the pilot valve (18) drives the main valve (16) in the valve (10) through the pilot pressure, the sealing control structure (20) comprises a sealing assembly (21) and a one-way conduction assembly (22), wherein, The sealing assembly (21) and the one-way conduction assembly (22) are integrally formed, and the sealing assembly (21) and the one-way conduction assembly (22) are made into an integral whole by a mold manufacturing method or are combined into an integral whole by bonding or fusion during the manufacturing process; The sealing assembly (21) can be arranged between the detachable end cover (12) and the end of the valve body (11), and is used for filling and sealing the gap between the detachable end cover (12) and the valve body (11); At least a part of the one-way conduction assembly (22) can be contained in the second channel (15), for controlling the fluid in the first channel (14) to enter the second channel (15), and blocking the fluid in the second channel (15) from flowing back to the first channel (14).

2. The seal control structure for a valve according to claim 1, characterized by, The one-way conduction assembly (22) comprises a duckbill valve (221) and a connecting part (222) integrally formed with the open end of the duckbill valve (221), wherein, The connecting part (222) is integrally formed with the sealing assembly (21); The duckbill valve (221) can be contained in the second channel (15).

3. The seal control structure for a valve according to claim 2, characterized by, The connecting part (222) is a sheet with a central hole, wherein, The central hole corresponds to the open end of the duckbill valve (221); The sheet fills a specific area of the sealing assembly (21), wherein the specific area of the sealing assembly (21) corresponds to the side wall of the gas outlet of the first channel (14) and the side wall of the gas inlet of the second channel (15).

4. The sealing control structure for the valve according to claim 1, wherein, In the case that a sealing groove is arranged on the side wall of the detachable end cover (12) and / or the side wall of the end of the valve body (11), The shape of the sealing assembly (21) matches the sealing groove.

5. The sealing control structure for the valve according to claim 3, wherein, In the case that a sealing groove is arranged on the side wall of the detachable end cover (12) and / or the side wall of the end of the valve body (11), The thickness of the sheet is smaller than the thickness of the sealing assembly (21).

6. The seal control structure for a valve according to any one of claims 1 to 5, characterized in that, the seal assembly (21) and the one-way conducting assembly (22) are made of an elastic material.

7. A valve device characterized by comprising: comprising: a valve (10) and a seal control structure (20) according to any one of claims 1 to 6.

Images