Valve core drive mechanism, valve, test system and test method

Abstract

The application provides a valve core driving mechanism, a valve, a test system and a test method. The valve core driving mechanism comprises a mounting base, an adjusting piece and an elastic piece. The mounting base is used for being mounted on a valve body. The elastic piece is arranged between the adjusting piece and the valve core and is used for applying pressure to the valve core towards a valve port. The adjusting piece is movably arranged on the mounting base to adjust the distance between the adjusting piece and the valve core in a preset direction.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a valve core drive mechanism, a valve, a testing system, and a testing method. Background Technology

[0002] Currently, research and analysis on the relationship between valve sealing and its influencing factors mainly focus on non-planar sealing structures such as ball valves and butterfly valves. There is relatively little experimental research on valves using planar seals. When designing systems for valves requiring planar seals, the roughness and flatness of the sealing surface (the surface used to seal the valve port) and the load applied to the valve core are primarily selected based on experience. This results in only a few specifications for the sealing surface area, roughness, and flatness of planar seals. Consequently, when designing valve ports, the same load is applied to different flow areas, leading to increased difficulty in determining the opening degree of on / off or regulating valves due to excessive or insufficient load. Furthermore, without sufficient verification data, increasing the machining accuracy of the sealing surface results in redundant machining accuracy in some models, increasing the manufacturing cost of parts.

[0003] In addition, the valve core of the existing planar sealing valve structure is subjected to complex stress conditions, which makes the calculation of valve core load complicated and makes it impossible to test its sealing performance. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a valve core drive mechanism, valve, test system and test method, which can solve the problem that the valve core is subjected to complex forces, which leads to the complicated calculation of valve core load in the prior art.

[0005] To achieve the objective of this invention, a first aspect provides a valve core driving mechanism for driving the valve core to move along a preset direction to adjust the distance between the valve core and the valve port; comprising a mounting base, an adjusting member, and an elastic member; wherein the mounting base is used to mount on a valve body;

[0006] The elastic element is disposed between the adjusting element and the valve core, and is used to apply pressure toward the valve orifice to the valve core;

[0007] The adjusting member is movably disposed on the mounting base to adjust the distance between the adjusting member and the valve core along the preset direction.

[0008] Optionally, the elastic element includes a first compression spring and a second compression spring, the second compression spring being located inside the space enclosed by the first compression spring, and both ends of the first compression spring and the second compression spring being disposed between the adjusting element and the valve core, for applying pressure toward the valve core to the valve port.

[0009] Optionally, the adjusting component includes an adjusting column with external threads, an elastic sleeve, and a spring cover plate, wherein the mounting base is provided with a hollow space, the inner peripheral wall of the hollow space formed by the mounting base is provided with internal threads, and the external threads of the adjusting column mate with the internal threads.

[0010] The elastic element, the elastic element sleeve, and the spring cover are all disposed in the hollow space, and the spring cover is located between the elastic element and the adjusting column. The two ends of the elastic element sleeve along its axial direction are an open end and a closed end, respectively. The elastic element is at least partially disposed in the elastic element sleeve and abuts against the spring cover through the open end. The closed end of the elastic element sleeve is used to abut against the valve core.

[0011] Optionally, the mounting base is provided with an opening for observing the elastic element, and the mounting base is provided with a scale to indicate the magnitude of the parameters of the elastic element related to its compression amount.

[0012] To achieve the objective of the present invention, a second aspect provides a valve, including a valve body, a valve core, and a valve core drive mechanism as described in the first aspect. The valve body has a first sealing surface and a valve port disposed on the first sealing surface. The valve core has a second sealing surface opposite to the valve port, and the valve core is movably disposed on the mounting base so that the second sealing surface can approach or move away from the valve port, and the second sealing surface can fit against the first sealing surface to achieve sealing of the valve port.

[0013] Optionally, the valve body includes a valve body and a valve port component disposed in a mounting groove of the valve body, a portion of the mounting base extends into the mounting groove and abuts against the valve port component; the surface of the valve port component facing away from the bottom of the mounting groove is the first sealing surface;

[0014] The valve body has a valve body inlet channel and a valve body outlet channel, and the valve port component has a valve port inlet channel and a valve port outlet channel. The outlet end of the valve body inlet channel is connected to the inlet end of the valve port inlet channel at the bottom of the mounting groove; the outlet end of the valve port outlet channel is connected to the inlet end of the valve body outlet channel at the bottom of the mounting groove; the inlet end of the valve port outlet channel is the valve port; the outlet end of the valve port inlet channel is located outside the first sealing surface, and when the first sealing surface and the second sealing surface are in contact, the outlet end of the valve port inlet channel is disconnected from the valve port; when the first sealing surface and the second sealing surface are separated, the outlet end of the valve port inlet channel is connected to the valve port.

[0015] To achieve the objective of this invention, a third aspect provides a testing system for detecting the fluid leakage of a valve as described in the second aspect; the testing system includes a gas source, an inlet pipe, an outlet pipe, and an extraction device; the outlet end of the inlet pipe is connected to the fluid inlet of the valve under test; the inlet end of the inlet pipe is connected to the gas source; the inlet end of the outlet pipe is connected to the fluid outlet of the valve under test; and the outlet end of the outlet pipe is connected to the extraction device; a flow control device and an on / off valve are provided on the inlet pipe.

[0016] To achieve the objective of this invention, a fourth aspect provides a sealing performance testing method for detecting the sealing performance of a valve as described in the second aspect, comprising:

[0017] The adjustment member is controlled to move, so as to gradually reduce the distance between the adjustment member and the valve core along the preset direction, so that the fluid leakage of the valve gradually decreases from the maximum value to 0;

[0018] The pressure corresponding to a leakage rate of 0 is calculated.

[0019] Optionally, the calculation of the pressure corresponding to the leakage amount being 0 includes:

[0020] The compression amount of the elastic element is calculated based on the parameters related to its compression amount obtained from the detection.

[0021] The pressure is calculated based on the compression and stiffness of the elastic element.

[0022] Optionally, the parameters related to the compression amount of the elastic element include the displacement of a preset component when the elastic element is compressed; the preset component is configured to displace with the compression of the elastic element.

[0023] Optionally, the sealing performance test method further includes:

[0024] Record at least one of the roughness, flatness, and flow area of ​​the first sealing surface when the leakage is 0.

[0025] The present invention has the following beneficial effects:

[0026] In the technical solution of the valve core drive mechanism and valve provided by this invention, when adjusting the distance between the regulating member and the valve core along a preset direction, the elastic member located between the two will undergo elastic deformation, and at the same time apply pressure towards the valve orifice to the valve core. Different distances result in different pressures. According to Hooke's Law, within the elastic limit, the pressure on the elastic member is proportional to the deformation. Therefore, by using the valve core drive mechanism provided by this invention to apply driving force to the valve core, the pressure on the elastic member, i.e., the pressure on the valve core, can be obtained by detecting the deformation of the elastic member. This makes it easier to test the sealing performance of the valve. Moreover, it can provide accurate experimental data to obtain the correspondence between parameters such as valve core material, roughness, flatness, flow area of ​​the sealing surface (the surface used to seal the valve orifice), and load applied to the valve core and sealing parameters (e.g., leakage). This avoids the problems of increasing the difficulty of opening the switching valve or regulating valve and redundant machining accuracy caused by selecting these parameters based on experience in the prior art due to excessive or insufficient load.

[0027] The testing system provided by this invention is used to detect the fluid leakage of the valve provided by this invention. Combined with the pressure on the elastic element obtained by detecting the deformation of the elastic element (i.e., the pressure on the valve core), the sealing performance of the valve can be tested. Moreover, it can obtain the correspondence between parameters such as valve core material, roughness, flatness, flow area of ​​the sealing surface (the surface used to seal the valve port), and pressure on the valve core and leakage, thereby avoiding the problems of increasing the difficulty of opening the valve or regulating valve and redundant processing accuracy caused by selecting these parameters based on experience in the prior art due to excessive or insufficient pressure on the valve core.

[0028] The sealing performance testing method provided by this invention is used to test the sealing performance of the valve provided by this invention. Specifically, by gradually reducing the distance between the regulating component and the valve core along a preset direction, the fluid leakage of the valve is gradually reduced from its maximum value to 0. During this process, the pressure on the valve core when the leakage is 0 can be obtained. Thus, the corresponding relationship between parameters such as the pressure on the valve core, the valve core material, the roughness, flatness, and flow area of ​​the sealing surface (the surface used to seal the valve port) can be obtained when the valve has no leakage. This avoids the problems caused by selecting these parameters based on experience in the prior art, which increases the difficulty of opening the valve or regulating valve due to excessive or insufficient pressure on the valve core, and leads to redundant processing accuracy. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a planar seal valve in the prior art;

[0030] Figure 2A A cross-sectional view of the valve core drive mechanism provided in an embodiment of the present invention;

[0031] Figure 2BThis is a schematic diagram illustrating the engagement of the bayonet and positioning rod according to an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the opening and scale provided for an embodiment of the present invention;

[0033] Figure 4 A cross-sectional view of a valve provided in an embodiment of the present invention;

[0034] Figure 5 A top view of a valve provided in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the gas channel provided in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of a testing system provided in an embodiment of the present invention.

[0037] Wherein: 01-valve body, 02-valve port component, 03-push rod, 04-pressure block, 05-spring, 06-valve core, 07-spring leaf;

[0038] 1-Valve core; 11-Boss; 2-Valve port component; 2a-Valve port; 21-Valve port inlet channel; 22-Valve port outlet channel; 23-Elastic diaphragm; 24-Positioning protrusion; 25-Annular groove; 3-Mounting base; 31-Hollow space; 311-Bayonet; 32-Opening; 33-Scale; 34-Positioning groove; 4-Adjusting component; 41-Adjusting column; 42-Elastic component sleeve; 43-Spring cover plate; 431-Positioning rod; 5-Elastic component; 51-First compression spring; 52-Second compression spring; 6-Valve body; 61-Valve body inlet channel; 62-Valve body outlet channel; 7-Spring pressure block; 8-Valve core seal; 9-Base seal; 10-Valve port sealing gasket;

[0039] 100-Gas source, 101-Inlet pipe, 102-Outlet pipe, 103-Ejection device, 104-Flow control device, 105-On / off valve. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of the present invention, the following description, in conjunction with the accompanying drawings, will provide a detailed description of the valve core drive mechanism, valve, testing system, and testing method provided by the present invention.

[0041] In related technologies, Figure 1 A diagram of an existing valve structure employing a planar seal is shown. (For example...) Figure 1As shown, the valve structure includes a valve body 01, a valve port component 02, a push rod 03, a pressure block 04, a spring 05, a valve core 06, and a reed 07. The lower surface of the valve port component 02 and the upper surface of the valve core 06 form a metal planar sealing surface, and the lower surface of the valve port component 02 is provided with a valve port. When the pressure block 04 is not under load, the upper surface of the valve core 06 and the lower surface of the valve port component 02 are tightly fitted together under the elastic action of the reed 07, achieving a valve port seal. When the pressure block 04 is subjected to a downward load, the pressure block 04 drives the push rod 03 to move downward, pushing the valve core 06 to overcome the elastic force of the reed 07 and move downward, thereby causing the upper surface of the valve core 06 and the lower surface of the valve port component 02 to separate, opening the valve port. At this time, fluid can flow along... Figure 1 The arrow indicates that the direction passes through the valve port. The distance between the upper surface of the valve core 06 and the lower surface of the valve port component 02 can be represented as the valve opening. The pressure between the valve port component 02 and the valve core 06 affects the sealing performance between the upper surface of the valve core 06 and the lower surface of the valve port component 02. However, in related technologies, when the valve port is closed, the force situation of the valve core 06 is complex, making it difficult to calculate the pressure of the valve core 06 on the valve port component 02, and it is impossible to test its sealing performance. Moreover, related technologies mainly rely on experience to select the roughness and flatness of the sealing surface (the surface used to seal the valve port) and the load applied to the valve core. This results in only a few specifications for the sealing surface area, roughness, and flatness of planar seals. Consequently, when designing the valve port, there is a problem of using the same load for different flow areas. This leads to increased difficulty in controlling the opening of the on / off valve or regulating valve due to excessive or insufficient load. Furthermore, in the absence of verification data, increasing the machining accuracy of the sealing surface results in redundant machining accuracy in some models, which increases the machining cost of the parts.

[0042] In order to solve at least one of the above technical problems, such as Figure 2A and Figure 4 As shown, this application embodiment provides a valve core driving mechanism for driving valve core 1 along a preset direction (e.g., Figure 2A The valve core 1 moves vertically to adjust the distance between the valve core 1 and the valve port 2a, thereby adjusting the valve opening. This valve core drive mechanism may include a mounting base 3, an adjusting member 4, and an elastic member 5. The mounting base 3 is used to mount the valve body 6, providing a mounting foundation for the adjusting member 4. The elastic member 5 is disposed between the adjusting member 4 and the valve core 1, applying pressure to the valve core 1 towards the valve port 2a. The adjusting member 4 is movably disposed on the mounting base 3 to adjust the distance between the adjusting member 4 and the valve core 1 along the preset direction.

[0043] Specifically, by adjusting the distance between itself and the valve core 1, the adjusting member 4 can adjust the deformation of the elastic member 5 in the aforementioned preset direction. Different deformation amounts result in different pressures exerted by the elastic member 5 on the valve core 1 towards the valve port 2a. According to Hooke's Law, within the elastic limit, the pressure on the elastic member is proportional to the deformation. Therefore, by applying a driving force to the valve core 1 using the valve core drive mechanism provided in this embodiment of the invention, the pressure on the elastic member 5, i.e., the pressure on the valve core 1, can be obtained by detecting the deformation of the elastic member 5. This makes it easier to test the sealing performance of the valve. Furthermore, it provides accurate experimental data to obtain the correspondence between parameters such as the valve core material, the roughness, flatness, and flow area of ​​the sealing surface (the surface used to seal the valve port), and the load applied to the valve core, and sealing parameters (e.g., leakage). This avoids the problems of increasing the difficulty of controlling the opening of the switching valve or regulating valve and redundant machining accuracy caused by selecting these parameters based on experience in the prior art due to excessive or insufficient load.

[0044] Based on this, in some embodiments, the adjusting member 4, the elastic member 5, and the valve core 1 are arranged coaxially, which can ensure that the elastic member 5 can transmit power to the valve core 1 without offset, reducing unnecessary vibration and wear.

[0045] In one specific embodiment, the elastic element 5 includes a first compression spring 51 and a second compression spring 52. The second compression spring 52 is located inside the space enclosed by the first compression spring 51. Both ends of the first compression spring 51 and the second compression spring 52 are disposed between the adjusting member 4 and the valve core 1, for applying pressure toward the valve port 2a to the valve core 1. Through the double-spring structure formed by the first compression spring 51 and the second compression spring 52, compared to a single spring, the elastic element 5 can apply a larger load with a compact structure, and can better absorb and disperse vibrations, reducing vibrations transmitted to other parts (e.g., to the valve core 1 or the adjusting member 4). This makes it easier to calculate... The pressure applied by the elastic element 5 is more accurate; the inner and outer compression springs support each other, which helps to reduce the possible skewing or instability of a single spring, making the output pressure more stable; the first compression spring 51 and the second compression spring 52 can be made of metal or non-metal materials. In order to enable the elastic element 5 to improve strength, increase elasticity, reduce weight or improve corrosion resistance during testing, the first compression spring 51 and the second compression spring 52 can also be composite springs; it should be noted that this embodiment does not specifically limit the structure and material of the elastic element 5. The elastic element 5 can be other elastic materials or structures that can be deformed and whose stiffness can be calculated.

[0046] Furthermore, such as Figure 2AAs shown, a spring block 7 is also provided between the adjusting member 4 and the elastic member 5. The spring block 7 is used to fix the top ends of the first compression spring 51 and the second compression spring 52. The adjusting member 4 and the spring block 7 can abut against each other or be separated from each other. Specifically, the top end of the spring block 7 along its axial direction is located inside the adjusting member 4, and the bottom end of the spring block 7 along its axial direction is provided with a first boss and a second boss that are respectively connected to the first compression spring 51 and the second compression spring 52. The first boss and the second boss are respectively used to limit the first compression spring 51 and the second compression spring 52, so that the first compression spring 51 and the second compression spring 52 are positioned. 52 can effectively transmit force and accurately position it, enabling the first compression spring 51 and the second compression spring 52 to work together to output stable pressure. By limiting the first compression spring 51 and the second compression spring 52 respectively through the first boss and the second boss, the phenomenon of the two springs being deflected or unstable can be further reduced. The spring pressure block 7 can be made of steel, aluminum alloy or engineering plastic. It should be noted that this embodiment does not specifically limit the structure and material of the spring pressure block 7. The spring pressure block 7 can be other structures and materials that can limit the first compression spring 51 and the second compression spring 52.

[0047] The adjusting member 4 can move relative to the mounting base 3 in a preset direction, and when it moves to the desired position, it can be fixed at that position. The elastic member 5 applies pressure to the valve core 1 toward the valve port 2a and is also fixed accordingly. The adjusting member 4 that realizes this function can have various structures. In one specific embodiment, the adjusting member 4 includes an adjusting column 41 with external threads, an elastic member sleeve 42, and a spring cover plate 43. The mounting base 3 is provided with a hollow space 31. The inner peripheral wall of the hollow space 31 formed by the mounting base 3 is provided with internal threads. The external thread of the adjusting column 41 is engaged with the internal thread provided on the inner peripheral wall of the hollow space 31. By rotating the adjusting column 41, the adjusting column 41 can be moved relative to the mounting base 3 along its axial direction. In order to facilitate the rotation of the adjusting column 41, an internal hexagon can be opened at the top of the adjusting column 41. In order to make the rotation control of the adjusting column 41 more precise, preferably, the rotation of the adjusting column 41 can be controlled by a stepper motor.

[0048] In other embodiments, such as Figure 2BAs shown, multiple slots 311 are arranged vertically in sequence on the outer peripheral wall of the adjusting column 41, and a positioning rod 431 is provided on the inner peripheral wall of the hollow space 31 of the mounting base 3. In this case, the positioning rod 431 can be moved out of the slot 311 and into the vertical channel on the left side of the slot 311 by lifting and rotating the adjusting column 41. At this time, the adjusting column 41 can move vertically until it reaches the slot 311 at the desired height. Then, the positioning rod 431 can be moved into the slot 311 at the desired height by rotating the adjusting column 41 in the opposite direction. It should be noted that under the action of the weight of the adjusting column 41, after the positioning rod 431 moves into the slot 311 at the desired height, it can automatically abut against the top of the slot 311. Figure 2B The location shown.

[0049] The elastic element 5, the elastic element sleeve 42, and the spring cover plate 43 are all disposed in the hollow space 31, with the spring cover plate 43 located between the elastic element 5 and the adjusting column 41. The elastic element sleeve 42 has an open end and a closed end along its axial direction, respectively. The elastic element 5 is at least partially disposed in the elastic element sleeve 42 and abuts against the spring cover plate 43 through its open end. The closed end of the elastic element sleeve 42 is used to abut against the valve core 1. By rotating the adjusting column 41, the adjusting column 41 moves in the hollow space 31, thereby driving the spring cover plate 43 to move in the hollow space 31. During this process, the spring cover plate 43 drives the elastic element 5 to move in the hollow space 31, the elastic element 5 drives the elastic element sleeve 42 to move in the hollow space 31, and the closed end of the elastic element sleeve 42 drives the valve core 1 to move in the hollow space 31, so as to realize the adjustment of the relative positional relationship between the valve core 1 and the valve port 2a.

[0050] In some embodiments, an elastic diaphragm 23 is provided on the side of the valve core 1 away from the elastic sleeve 42. The inner peripheral edge of the elastic diaphragm 23 is sealed to the outer peripheral edge of the boss on the side of the valve core 1 near the valve port 2a. The outer peripheral edge of the elastic diaphragm 23 is sealed to the inner peripheral wall of the mounting base 3 at the location in the hollow space 31 where at least part of the valve core 1 is accommodated. The elastic diaphragm 23 is used to apply a spring force to the valve core 1 in a direction away from the valve port 2a so that the valve core 1 can be reset when the pressure is released.

[0051] On the one hand, the elastic sleeve 42 protects the elastic element 5 from external physical damage during use, such as scratches or impacts, and reduces the entry of impurities into the spring, thereby extending the spring's service life. Furthermore, when the elastic element 5 is compressed or stretched, the elastic sleeve 42 not only acts as a guide to ensure the elastic element 5 moves in a straight line, but also prevents bending or twisting, allowing the pressure applied by the elastic element 5 to be accurately calculated. On the other hand, it does not affect the movement of the spring cover plate 43 towards the elastic element 5. Since friction may also exist between the elastic element 5 and the elastic sleeve 42, occurring when the elastic element 5 contacts the inner wall of the elastic sleeve 42 during compression or stretching, lubricant can be applied to the outer surface of the elastic element 5 and / or the inner surface of the elastic sleeve 42 to address the resulting wear and noise problems. Additionally, lubricant can be applied to the outer surface of the elastic element 5 and / or the inner surface of the elastic sleeve 42. Alternatively, the surface of the elastic sleeve 42 may be treated, such as by plating (e.g., nickel, chromium) or coating with a wear-resistant coating, which can reduce friction and improve wear resistance. The elastic sleeve 42 may be made of metal or plastic, but plastic is preferred for weight reduction. The outer wall of the elastic sleeve 42 and the inner wall of the hollow space 31 are fitted with a clearance fit to reduce friction and wear, and also to facilitate disassembly. To cope with the frictional resistance that may be caused by friction between the outer wall of the elastic sleeve 42 and the inner wall of the hollow space 31, the outer wall of the elastic sleeve 42 and / or the inner wall of the hollow space 31 are made with a low surface roughness, for example, a surface roughness Ra of 0.1 or 0.05. It should be noted that this embodiment does not specifically limit the structure of the elastic sleeve 42. As long as it can accommodate the elastic element 5 and can move in the hollow space 31, the elastic sleeve 42 may adopt other structures.

[0052] In one specific implementation, such as Figure 3 As shown, the mounting base 3 is provided with an opening 32 for observing the elastic element 5, and the mounting base 3 is provided with a scale 33 to indicate the magnitude of the parameters related to the compression amount of the elastic element 5. Specifically, by using the opening 32 provided on the mounting base 3, the movement state of the elastic element 5 can be observed by observing the spring cover plate 4. By using the scale 33 provided on the mounting base 3, the stroke of the spring cover plate 4 can be recorded to obtain the magnitude of the parameters related to the compression amount of the elastic element 5.

[0053] In embodiments where a latch 311 is provided on the outer peripheral wall of the adjusting column 41, such as... Figure 2B As shown, the dimensions can be marked at different bayonet 311. Based on the difference in dimensions at different bayonet 311, the stroke of the spring cover plate 4 can also be obtained, thereby obtaining the size of the elastic element 5 and its compression related parameters. Using the above scheme, there is no need to set an opening 32 on the mounting base 3, nor is there a need to set a scale 33 on the mounting base 3.

[0054] In other embodiments, the mounting base 3 is made of a transparent material, such as plexiglass. In this case, the movement of the elastic element 5 can be clearly observed. In order to obtain the stroke of the spring cover plate 4, a scale can be provided in the hollow space 31 and along the axial direction of the hollow space 31 to obtain the size of the elastic element 5 and the parameters related to its compression amount.

[0055] In some embodiments, the pressure applied by the elastic element 5 can be obtained by setting a pressure sensor. For example, the pressure sensor can be set at the top of the valve core 1, and the pressure of the elastic element 5 can be directly applied to the pressure sensor to obtain the pressure applied by the elastic element 5. Specifically, the pressure sensor is one of a strain gauge pressure sensor, a piezoresistive pressure sensor, a capacitive pressure sensor, or a piezoelectric pressure sensor, and outputs pressure data through analog signals, digital signals, or wireless transmission. In addition, the method of obtaining the pressure applied by the elastic element 5 by setting a pressure sensor can be used as the sole source of obtaining the pressure applied by the elastic element 5, or this method can coexist with other methods of this specific embodiment. That is, the data collected by the pressure sensor can be used to verify the accuracy of the pressure applied by the elastic element 5 obtained by other methods of this specific embodiment.

[0056] In one specific implementation, such as Figure 4 and Figure 5 As shown, the mounting base 3 is fixedly mounted on the valve body 6. For example, the mounting base 3 is fixedly mounted on the valve body 6 by a number of fixing screws. Specifically, the mounting base 3 is fixedly mounted on the valve body 6 by four fixing screws. It should be noted that this embodiment does not specifically limit the connection between the mounting base 3 and the valve body 6. The mounting base 3 and the valve body 6 can also be fixed by adhesive or welding.

[0057] In one specific embodiment, a valve core seal 8 is provided between the valve core 1 and the hollow space 31. Specifically, a groove for accommodating the valve core seal 8 is provided on the outer wall of the valve core 1. The valve core seal 8 forms a sealing structure between the groove and the inner wall of the hollow space 31 to prevent fluid from the valve port 2a from leaking into the gap between the valve core 1 and the hollow space 31. Similarly, it can also prevent fluid in the gap between the valve core 1 and the hollow space 31 from entering the valve port 2a. For example, the valve core seal 8 can be an O-ring. The groove for accommodating the valve core seal 8 can also be provided on the inner wall of the hollow space 31. When calculating the pressure between the valve port 2a and the valve core 1, the frictional force generated by the O-ring is small and can be ignored. To ensure smooth movement of the valve core 1 within the hollow space 31, the outer wall of the valve core 1 and the inner wall of the hollow space 31 should have a clearance fit. The clearance reduces friction and wear, while also facilitating disassembly. To address potential friction between the outer wall of the valve core 1 and the inner wall of the hollow space 31, the outer wall of the valve core 1 and / or the inner wall of the hollow space 31 should have a low surface roughness, for example, a surface roughness Ra of 0.1 or 0.05. It should be noted that this embodiment does not specifically limit the type and location of the valve core seal 8. As long as a seal can be formed between the valve core 1 and the hollow space 31, other types and locations of valve core seal 8 are also acceptable.

[0058] In one specific implementation, such as Figure 2A and Figure 4 As shown, a portion of the bottom of the mounting base 3 extends into the mounting groove on the valve body 6. The portion of the mounting base 3 extending into the mounting groove has a positioning groove 34. The positioning groove 34 is used to limit the engagement with the positioning protrusion 24 provided around the valve port 2a. When the valve core 1 gradually approaches the valve port 2a, the force acting on the valve port 2a may cause the valve core 1 and the valve port 2a to move radially relative to each other, which in turn causes the sealing surface to move and affects the sealing effect. In this regard, the engagement of the positioning groove 34 and the positioning protrusion 24 can limit the radial relative movement of the valve core 1 and the valve port 2a, so that the sealing surfaces are aligned and a seal is achieved.

[0059] Based on the same inventive concept, such as Figure 4 and Figure 5As shown, this embodiment also provides a valve, including a valve body 6, a valve core 1, and a valve core driving mechanism as described in any of the above embodiments. The valve body 6 includes, for example, a main valve body and a valve port component 2 disposed in a mounting groove of the main valve body. The valve port component 2 has a first sealing surface (i.e., the surface of the valve port component 2 facing away from the bottom of the mounting groove) and a valve port 2a disposed on the first sealing surface. The valve core 1 has a second sealing surface opposite to the valve port 2a, and the valve core 1 is movably disposed on the mounting base 3 so that the second sealing surface can approach or move away from the valve port 2a, and the second sealing surface can fit against the first sealing surface to realize the valve port Specifically, in the sealing of 2a, the outer wall of the valve port component 2 and the inner wall of the mounting groove are in clearance fit. At this time, the valve port component 2 can be cylindrical but is not limited to cylindrical. The main valve body of the valve body 6 and the valve port component 2 are respectively provided with channels for the inflow of fluid (e.g., gas or liquid), through the valve port, and then outflow. The mounting base 3 is fixedly installed on the main valve body of the valve body 6, and a part of the mounting base 3 extends into the mounting groove and abuts against the upper surface of the valve port component 2. The side wall of the mounting groove and the positioning groove 34 are in limiting fit with the positioning protrusion 24, which can realize the positioning of the mounting base 3.

[0060] In some embodiments, both the first sealing surface and the second sealing surface are planar, and the second sealing surface is fitted with the first sealing surface to form a planar seal.

[0061] In one specific implementation, such as Figure 4 and Figure 6 As shown, the valve body 6 has a valve body inlet channel 61 and a valve body outlet channel 62. The valve body inlet channel 61 is connected to the valve port inlet channel 21 in the valve port component 2. The valve port component 2 has a valve port inlet channel 21 and a valve port outlet channel 22. The outlet end of the valve body inlet channel 61 and the inlet end of the valve port inlet channel 21 are connected at the bottom of the mounting groove. That is, the outlet end of the valve body inlet channel 61 is located at the bottom surface of the mounting groove, and correspondingly, the inlet end of the valve port inlet channel 21 is located on the surface of the valve port component 2 relative to the bottom surface of the groove (i.e., Figure 6 The bottom surface of the valve port component 2 shown. The outlet end of the valve port outlet channel 22 is connected to the inlet end of the valve body outlet channel 62 at the bottom of the mounting groove, that is, the outlet end of the valve port outlet channel 22 is located on the surface of the valve port component 2 relative to the bottom surface of the groove (i.e., Figure 6The bottom surface of the valve port component 2 is shown, and correspondingly, the inlet end of the valve body outlet channel 62 is located at the bottom surface of the mounting groove. The inlet end of the valve port outlet channel 22 is the valve port 2a; the outlet end of the valve port inlet channel 21 is located outside the first sealing surface. Specifically, in some embodiments, an elastic diaphragm 23 is provided on the side of the valve core 1 near the valve port component 2. The inner peripheral edge of the elastic diaphragm 23 is sealed to the outer peripheral edge of the boss 11 on the side of the valve core 1 near the valve port 2a. The outer peripheral edge of the elastic diaphragm 23 is sealed to the inner peripheral wall of the mounting base 3 in the hollow space 31. The elastic diaphragm 23 is used to apply a spring force to the valve core 1 in a direction away from the valve port 2a so that the valve core 1 can be reset when the pressure is released. In this case, the surface of the boss 11 opposite to the first sealing surface where the valve port 2a is located (i.e., the lower surface) is the second sealing surface. The aforementioned elastic diaphragm 23 is also used to seal the gap between the outer periphery of the boss 11 and the inner peripheral wall of the mounting base 3 in the hollow space 31, so as to prevent fluid from entering the hollow space 31.

[0062] Furthermore, in some embodiments, the central region of the surface (i.e., the upper surface) of the valve port component opposite to the valve core 1 is used as the first sealing surface, and the surface is also provided with an annular groove 25, which surrounds the first sealing surface. Based on this, the valve port inlet channel 21 is an annular channel, and the outlet end of the valve port inlet channel 21 is located at the bottom surface of the annular groove 25.

[0063] When the first sealing surface and the second sealing surface are in contact, the outlet end of the valve inlet channel 21 is disconnected from the valve port 2a, and at this time, the valve inlet channel 21 and the valve outlet channel 22 are not connected; when the first sealing surface and the second sealing surface are separated, the outlet end of the valve inlet channel 21 is connected to the valve port 2a, and at this time, the valve inlet channel 21 and the valve outlet channel 22 are connected, and the fluid can flow along... Figure 6 The flow direction is indicated by the middle arrow.

[0064] Furthermore, a valve port sealing gasket 10 is provided at the bottom of the mounting groove between the valve port component 2 and the valve body 6, and the valve port sealing gasket 10 is used to achieve a seal. Specifically, a receiving groove is provided at the outlet end of the valve port outlet channel 22 to receive the valve port sealing gasket 10. The valve port sealing gasket 10 can be an O-ring. It should be noted that this embodiment does not specifically limit the type and placement of the valve port sealing gasket 10.

[0065] In one specific embodiment, a base seal 9 is provided between the valve body of the valve body 6 and the mounting base 3; the base seal 9 is used to prevent fluid from flowing in or out between the valve body of the valve body 6 and the mounting base 3.

[0066] Specifically, a first groove is formed between the side wall of the mounting groove of the valve body 6 and the upper end face of the valve body of the valve body 6, and a second groove is formed at the lower end face of the mounting base 3 corresponding to the first groove. The base seal 9 is disposed in the space enclosed by the first groove and the second groove, wherein the width of the first groove and the second groove are the same. For example, the base seal 9 can be an O-ring. It should be noted that this embodiment does not specifically limit the type and setting position of the base seal 9.

[0067] Based on the same inventive concept, such as Figure 4 and Figure 7 As shown, this embodiment also provides a testing system for detecting the fluid leakage of a valve as described in the above embodiment. The testing system may include a gas source 100, an inlet pipe 101, an outlet pipe 102, and a vacuum device 103. The outlet end of the inlet pipe 101 is connected to the fluid inlet of the valve under test, i.e., the inlet end of the valve body inlet channel 61. The inlet end of the inlet pipe 101 is connected to the gas source 100. The inlet end of the outlet pipe 102 is connected to the fluid outlet of the valve under test, i.e., the outlet end of the valve body outlet channel 62. The outlet end of the outlet pipe 102 is connected to the vacuum device 103. A flow control device 104 and an on / off valve 105 are provided on the inlet pipe 101.

[0068] During testing, the on / off valve 105 is opened, and the fluid pressure on the inlet pipe 101 is adjusted. By controlling the movement of the adjusting component 4, the distance between the adjusting component 4 and the valve core 1 along the preset direction is gradually reduced until the valve core 1 seals with the valve port 2a. Specifically, the valve core 1 is driven to move along the preset direction by the valve core drive mechanism to adjust the distance between the valve core 1 and the valve port 2a, so that the second sealing surface presses against the first sealing surface. Under the elastic force of the first compression spring 51 and the second compression spring 52, the sealing surface formed by the second sealing surface and the first sealing surface undergoes contact deformation to achieve sealing. The fluid leakage data is obtained based on the fluid flow rate on the outlet pipe 102. It should be noted that in this embodiment, a gas source is used as the fluid medium, but this embodiment is not limited to this, and the fluid medium can be a liquid.

[0069] Based on the same inventive concept, this embodiment also provides a sealing performance testing method, which uses the testing system described above to detect the sealing performance of the valve described above, including:

[0070] The control adjustment element 4 is moved to gradually reduce the distance between the adjustment element 4 and the valve core 1 in a preset direction, so that the fluid leakage of the valve gradually decreases from the maximum value to 0.

[0071] The pressure corresponding to a leakage rate of 0 was calculated.

[0072] The aforementioned pressure is the pressure applied by the elastic element 5 to the valve core 1 toward the valve port 2a.

[0073] During testing, the on / off valve 105 is opened, and the fluid pressure on the inlet pipe 101 is adjusted. By controlling the movement of the regulating element 4, the distance between the regulating element 4 and the valve core 1 along the preset direction is gradually reduced until the valve core 1 and the valve port 2a are sealed.

[0074] In one specific implementation, the pressure corresponding to a leakage rate of 0 is calculated, including:

[0075] Based on the parameters related to the compression amount of the elastic element 5 obtained from the test, the compression amount of the elastic element 5 is calculated.

[0076] The pressure mentioned above is calculated based on the compression amount and stiffness of the elastic element 5.

[0077] Specifically, the stroke of the spring cover plate 4 is obtained through the opening 32 and scale 33 provided on the mounting base 3, thereby obtaining the compression amount of the elastic element 5. According to the compression amount of the elastic element 5 and the formula F = KX, the pressure F applied by the elastic element 5 to the valve core 1 toward the valve port 2a is obtained, where K is the stiffness of the elastic element 5; X is the compression amount of the elastic element 5 obtained by observing the scale.

[0078] In one specific embodiment, the distance between the adjusting element 4 and the valve core 1 along a preset direction is gradually reduced so that the fluid leakage of the valve gradually decreases from its maximum value to 0. For example, the pressures corresponding to 0.5%, 0.3%, and 0.1% of the maximum fluid leakage are calculated, and then the critical pressure at which the fluid leakage of the valve is 0 is obtained through corresponding calculations. The critical pressure is an important indicator for measuring the sealing performance of a valve. It indicates that under this pressure, the valve can completely prevent fluid leakage and achieve an ideal sealing effect.

[0079] In one specific embodiment, the parameters related to the compression amount of the elastic element 5 include the displacement of a preset component when the elastic element 5 is compressed; the preset component is configured to displace with the compression of the elastic element 5.

[0080] In one specific embodiment, the sealing performance testing method further includes recording at least one of the roughness, flatness, and flow area of ​​the first sealing surface when the leakage is 0. Different flow areas result in different pressure deformations of the first sealing surface. If the deformation is too small, fluid will flow out from the gap, causing leakage; if the deformation is too large, the first sealing surface will be damaged. If the requirements for the roughness and flatness of the first sealing surface are too high, it will cause processing difficulties and significantly increase processing costs; if the requirements are too low, leakage may occur. When the leakage is 0, there is a corresponding relationship between the roughness, flatness, and flow area of ​​the first sealing surface. This relationship can be used to determine the required force per unit area under specific roughness and flatness conditions of the first sealing surface to prevent leakage. Based on the force per unit area that prevents leakage, appropriate flatness and roughness of the first sealing surface can be selected, thereby avoiding excessively high processing precision and reducing processing costs. Simultaneously, based on the force per unit area that prevents leakage, appropriate stiffness of the elastic element 5 can also be selected, thereby obtaining better valve switching performance. It should be noted that in actual operation, zero leakage may be an ideal state, and there may be a small amount of leakage in reality. In this case, when the leakage is less than a preset threshold, the leakage can be considered zero.

[0081] Specifically, in the actual testing process, different specifications of flow area, roughness, and flatness were selected for testing. For example, the flow area was selected for flow rates of 50 sccm, 1 slm, and 10 slm; the roughness was selected for Ra0.1, Ra0.2, and Ra0.4; and the flatness was selected for 0.01, 0.03, and 0.05. Based on the combination of these three factors—flow area, roughness, and flatness—different valve ports 2a were manufactured. Based on the data obtained from the tests, the correspondence between leakage and pressure, sealing area, and test fluid pressure can be analyzed. The sealing area is defined as the area of ​​the contact point between the first and second sealing surfaces. Through data analysis, the relationship between the unit area force, flatness, roughness, and leakage of the first sealing surface of valve port 2a can be obtained. For example, regression analysis or curve fitting methods can be used to establish quantitative relationships between these parameters from the data, thereby providing a basis for optimizing the sealing design.

[0082] For example, the first sealing surface is a metal sealing surface. According to the above test method, it can be determined how much force per unit area of ​​the metal sealing surface will not cause leakage under specific flatness and roughness conditions. It is worth noting that the test method in this embodiment is applicable not only to metal sealing surfaces but also to non-metallic sealing surfaces, such as those made of graphite and polytetrafluoroethylene. Although the physical and chemical properties of these materials differ from those of metals, their sealing performance under different flatness and roughness conditions can still be evaluated through similar test procedures, thus providing a basis for selecting suitable sealing materials and optimizing sealing designs.

[0083] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A valve core driving mechanism for driving the valve core to move along a preset direction to adjust the distance between the valve core and the valve port; characterized in that, Includes a mounting base, adjusting components, and elastic components; among which, The mounting base is used for mounting onto the valve body; The elastic element is disposed between the adjusting element and the valve core, and is used to apply pressure toward the valve orifice to the valve core; The adjusting member is movably disposed on the mounting base to adjust the distance between the adjusting member and the valve core along the preset direction.

2. The valve core driving mechanism according to claim 1, characterized in that, The elastic element includes a first compression spring and a second compression spring. The second compression spring is located inside the space enclosed by the first compression spring. Both ends of the first compression spring and the second compression spring are disposed between the adjusting element and the valve core, for applying pressure toward the valve core to the valve port.

3. The valve core driving mechanism according to claim 1, characterized in that, The adjusting component includes an adjusting column with external threads, an elastic sleeve, and a spring cover plate. The mounting base has a hollow space, and the inner peripheral wall of the hollow space formed by the mounting base has internal threads. The external threads of the adjusting column mate with the internal threads. The elastic element, the elastic element sleeve, and the spring cover are all disposed in the hollow space, and the spring cover is located between the elastic element and the adjusting column. The two ends of the elastic element sleeve along its axial direction are an open end and a closed end, respectively. The elastic element is at least partially disposed in the elastic element sleeve and abuts against the spring cover through the open end. The closed end of the elastic element sleeve is used to abut against the valve core.

4. The valve core drive mechanism according to any one of claims 1-3, characterized in that, The mounting base has an opening for observing the elastic element, and the mounting base has a scale to indicate the magnitude of the parameters of the elastic element related to its compression amount.

5. A valve, characterized in that, The device includes a valve body, a valve core, and a valve core drive mechanism as described in any one of claims 1-4. The valve body has a first sealing surface and a valve port disposed on the first sealing surface. The valve core has a second sealing surface opposite to the valve port, and the valve core is movably disposed on the mounting base so that the second sealing surface can approach or move away from the valve port, and the second sealing surface can fit against the first sealing surface to achieve sealing of the valve port.

6. The valve according to claim 5, characterized in that, The valve body includes a valve body and a valve port component disposed in a mounting groove of the valve body. A portion of the mounting base extends into the mounting groove and abuts against the valve port component. The surface of the valve port component facing away from the bottom of the mounting groove is the first sealing surface. The valve body has a valve body inlet channel and a valve body outlet channel, and the valve port component has a valve port inlet channel and a valve port outlet channel. The outlet end of the valve body inlet channel is connected to the inlet end of the valve port inlet channel at the bottom of the mounting groove; the outlet end of the valve port outlet channel is connected to the inlet end of the valve body outlet channel at the bottom of the mounting groove; the inlet end of the valve port outlet channel is the valve port; the outlet end of the valve port inlet channel is located outside the first sealing surface, and when the first sealing surface and the second sealing surface are in contact, the outlet end of the valve port inlet channel is disconnected from the valve port; when the first sealing surface and the second sealing surface are separated, the outlet end of the valve port inlet channel is connected to the valve port.

7. A testing system, characterized in that, The test system is used to detect the fluid leakage of the valve as described in claim 5 or 6. The test system includes a gas source, an inlet pipe, an outlet pipe, and a suction device. The outlet end of the inlet pipe is connected to the fluid inlet of the valve under test. The inlet end of the inlet pipe is connected to the gas source. The inlet end of the outlet pipe is connected to the fluid outlet of the valve under test, and the outlet end of the outlet pipe is connected to the suction device. A flow control device and an on / off valve are provided on the inlet pipe.

8. A method for testing sealing performance, used to detect the sealing performance of a valve as described in claim 5 or 6, characterized in that, include: The adjustment component is controlled to move, gradually reducing the distance between the adjustment component and the valve core along the preset direction, so that the fluid leakage of the valve gradually decreases from the maximum value to 0; The pressure corresponding to a leakage rate of 0 is calculated.

9. The sealing performance testing method according to claim 8, characterized in that, The calculation of the pressure corresponding to a leakage rate of 0 includes: The compression amount of the elastic element is calculated based on the parameters related to its compression amount obtained from the detection. The pressure is calculated based on the compression and stiffness of the elastic element.

10. The sealing performance testing method according to claim 9, characterized in that, The parameters related to the compression amount of the elastic element include the displacement of a preset component when the elastic element is compressed; the preset component is configured to displace as the elastic element is compressed.

11. The sealing performance testing method according to claim 8, characterized in that, Also includes: Record at least one of the roughness, flatness, and flow area of ​​the first sealing surface when the leakage is 0.

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