Low-resistance slow-closing one-way valve for pressure coupling device

Abstract

The invention belongs to the technical field of mine cooling, and discloses a low-resistance slow-closing one-way valve for a pressure coupling device, which comprises a valve body, and a flow guide support piece, a valve plate, a spring and a flow guide nut which are coaxially mounted with the valve body, the valve body is provided with an axially-through inner cavity for fluid to flow. The flow guide supporting piece is connected with the valve body through a positioning boss and a fastening screw, and the positioning boss is connected with the flow guide cover, the shaft sleeve and the damping cavity. A valve plate shaft of the valve plate axially slides relative to the shaft sleeve, the two ends of the valve plate shaft are connected with the sealing plate and the flow guide nut respectively, and sealing is formed when the sealing plate makes contact with the valve body. A limiting boss is arranged between the sealing plate and the valve plate shaft; a spring is arranged outside the limiting boss and the shaft sleeve; the flow guide nut comprises a flow guide part and a damping column, and the damping column and the damping cavity are matched to form a slow closing structure. The flow resistance is low during forward flow and reverse flow, the impact of the sealing surface is effectively reduced through a simple slow closing structure, the valve is prevented from being damaged by a water hammer, and therefore the service life of the valve is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of mine cooling, and in particular relates to a slow-closing one-way valve for a pressure coupling device. Background Art

[0002] As coal mining continues to increase in depth, heat damage in mines is becoming increasingly serious. As a mainstream heat damage prevention technology, ground-based centralized refrigeration and cooling systems offer advantages such as convenient condensation heat removal, high cooling efficiency, and simple and reliable equipment. They are widely used in large, deep coal mines. This system involves fluids of varying pressures and temperatures, requiring a pressure conversion process: high-pressure cold water (typically around 3°C) is converted to low-pressure cold water, and low-pressure warm water (typically around 18°C) is converted to high-pressure warm water. The pressure coupling device, which meets these high- and low-pressure fluid pressure conversion requirements, is a core component of the ground-based centralized refrigeration and cooling system.

[0003] Currently, the pressure coupling devices used in ground-based centralized refrigeration and cooling systems are generally valve-controlled. These devices convert high- and low-pressure fluids through the sequential switching of valves on the driver and response sides. For valve-controlled pressure coupling devices, the control valves selected on both the driver and response sides are crucial to their performance. Considering the device's actual operating characteristics, the response side typically uses a check valve that automatically opens and closes in response to fluid pressure differentials, while the driver side also uses a check valve of the same specifications, cleverly installed in reverse and relying on an external drive mechanism for active opening and closing. Therefore, valve-controlled pressure coupling devices are available with both forward- and reverse-mounted check valves. These check valves are subject to higher performance requirements, including low flow resistance in both forward and reverse flow conditions, high reliability, and a long service life. Conventional check valves are typically designed only for forward flow and fail to fully account for reverse flow, resulting in higher flow resistance during reverse flow. Furthermore, conventional check valves lack a simple and effective slow-closing mechanism, which can cause the valve disc to impact the valve body during closing, posing a risk of water hammer. Summary of the Invention

[0004] In order to meet the special requirements of valve-controlled pressure coupling devices for high-performance one-way valves, the present invention designs a low-resistance slow-closing one-way valve for pressure coupling devices, which achieves low flow resistance in both forward and reverse flows. Through a simple slow-closing structure, it effectively reduces the impact of the sealing surface and prevents water hammer from damaging the valve, thereby extending the service life of the valve.

[0005] In order to achieve the above-mentioned object of the invention, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a low-resistance slow-closing one-way valve for a pressure coupling device, comprising a valve body and a flow guide support member, a valve plate, a spring and a flow guide nut coaxially installed with the valve body;

[0007] The valve body has an axially through inner cavity for fluid flow, and the inner cavity wall includes an inlet arc portion, a valve body sealing surface, a flow arc portion and an outlet arc portion in sequence from the inlet end to the outlet end, and the transition between each portion is smooth; the flow arc portion gradually expands in diameter and then gradually shrinks in diameter from the inlet end to the outlet end of the valve body, so as to achieve a substantially unchanged fluid flow area when the one-way valve is in a fully open state; the outlet end face of the valve body is provided with a positioning groove, and the positioning groove is axially connected to the outlet arc portion;

[0008] The flow guide support member includes a positioning boss installed in the positioning groove, the positioning boss is fixedly connected to the valve body by a fastening screw; the positioning boss is connected to the flow guide cover and the damping chamber via a support rod, the flow guide cover is located inside the valve body, and the damping chamber is located outside the valve body; a shaft sleeve is provided inside the flow guide cover, and a spring groove is provided on the surface of the closed structure between the shaft sleeve and the flow guide cover; the damping chamber is axially connected to the shaft sleeve and is used for the axial sliding of the flow guide nut;

[0009] The valve plate includes a valve plate shaft, which is installed in the shaft sleeve and can slide axially relative to the shaft sleeve; the end of the valve plate shaft located inside the valve body is connected to the sealing plate, and the end of the valve plate shaft located outside the valve body is connected to the guide nut; the side of the sealing plate facing the valve plate shaft is limited by the guide cover, and the side of the sealing plate facing away from the valve plate shaft is provided with a valve plate sealing surface, and a seal is formed when the valve plate sealing surface contacts the valve body sealing surface; a limiting boss is provided between the sealing plate and the valve plate shaft, and the limiting boss is used to limit the installation spring;

[0010] The spring is mounted on the limiting boss and the outside of the sleeve, with one end of the spring positioned by the limiting boss and the other end positioned by the spring slot;

[0011] The guide nut includes a guide part and a damping column that are integrally connected; the guide part is a conical structure with a rounded tip to achieve a smooth transition of the guide part as a whole; the outer diameter of the damping column is smaller than the inner diameter of the damping cavity, thereby cooperating with the damping cavity to form a slow-closing structure.

[0012] Furthermore, the inlet arc portion gradually shrinks from the inlet end of the valve body, and then gradually expands in diameter to transitionally connect with the sealing surface of the valve body.

[0013] Preferably, with the valve body sealing surface as a reference, the angle between the tangent of the flow arc and the axial direction of the valve body is not less than 45° and not more than 90°.

[0014] Furthermore, the outflow arc portion gradually narrows from the inlet end to the outlet end of the valve body, so that the fluid flow area remains substantially unchanged when the one-way valve is in a fully open state.

[0015] Furthermore, the inner diameter and the outer diameter of the air guide cover gradually increase from the direction close to the positioning boss to the direction away from the positioning boss.

[0016] Furthermore, the support rods are evenly distributed circumferentially and radially extended between the positioning boss and the air guide cover, and the fan-shaped cavity between the positioning boss and the air guide cover is used for fluid circulation.

[0017] Preferably, the cross section of the support rod is elliptical.

[0018] Preferably, the valve body sealing surface is a conical surface, and the valve plate sealing surface is an arc surface, so as to achieve line sealing cooperation between the valve body sealing surface and the valve plate sealing surface.

[0019] Furthermore, the outer diameter of the sealing plate is larger than the maximum outer diameter of the flow guide cover, so that when the one-way valve is in a fully open state, the flow guide cover can limit the valve plate.

[0020] Furthermore, the small diameter end of the guide portion faces away from the valve plate shaft and the large diameter end is integrally connected to the damping column.

[0021] Furthermore, a stud is provided at the end of the valve plate shaft outside the valve body; the damping column is axially provided with an internal threaded hole toward the center of one end of the valve plate shaft, and the internal threaded hole matches the stud of the valve plate; the fixed connection between the valve plate shaft and the guide nut is achieved through the threaded connection between the stud and the internal threaded hole.

[0022] Preferably, the outer edge of one end of the damping column facing the valve plate shaft is provided with a plurality of circumferentially evenly distributed notches.

[0023] Preferably, the damping column always keeps a part of its structure within the damping cavity to provide auxiliary support for the valve plate.

[0024] Furthermore, when the valve-controlled pressure coupling device is used in the mine cooling system, it is divided into two types: response end and drive end installation and use.

[0025] The beneficial effects of the present invention are:

[0026] (1) The low-resistance slow-closing one-way valve for the pressure coupling device of the present invention achieves a slow-closing effect during the valve closing process by constructing a simple structure in which a damping chamber and a damping column cooperate with each other, thereby reducing the impact between the valve plate and the sealing surface of the valve body, reducing the operating noise of the device, and extending the service life of the valve; the damping column also plays an auxiliary supporting role for the valve plate in the damping chamber, thereby improving the coaxiality of the valve plate and the valve body.

[0027] (2) The pressure coupling device of the present invention uses a low-resistance slow-closing one-way valve to construct a dual flow-guiding structure of a flow guide cover and a flow guide nut, thereby achieving a better flow state during forward and reverse flow of the valve, reducing two-way flow resistance, improving the working efficiency of the device, and reducing operating energy consumption costs.

[0028] (3) The low-resistance slow-closing one-way valve for the pressure coupling device of the present invention adopts a line sealing structure of arc surface against conical surface, which has a better sealing effect and is particularly suitable for large pressure difference conditions, and has a sealing self-compensation effect; the curved surface configuration of the flow arc part of the valve body cavity is also reasonably designed to ensure that the one-way valve disc opens normally and quickly, and reduce the pulsation amplitude of the fluid flow.

[0029] (IV) The flow guide support of the present invention is installed on the valve body by means of a positioning boss and is fastened with bolts, which not only ensures the high coaxiality requirement between the valve body and the valve plate, but also improves the convenience of installation and disassembly of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic cross-sectional view of a one-way valve provided in an embodiment of the present invention in a fully open state;

[0031] Figure 2 A schematic cross-sectional view of a one-way valve in a fully closed state provided by an embodiment of the present invention;

[0032] FIG3 is a schematic diagram of a valve body in a one-way valve provided in an embodiment of the present invention: (a) a cross-sectional view, and (b) a three-dimensional view;

[0033] Figure 4 It is a partial enlarged view of the circle in Figure 3(a);

[0034] FIG5 is a schematic diagram of a flow guide support member in a one-way valve provided by an embodiment of the present invention: (a) a cross-sectional view, and (b) a three-dimensional view;

[0035] FIG6 is a schematic cross-sectional view of (a) a valve plate and (b) a partial enlarged view of the sealing engagement between the valve plate and the valve body in a one-way valve provided in an embodiment of the present invention;

[0036] FIG7 is a diagram showing (a) a cross-sectional view and (b) a three-dimensional view of the guide nut in the one-way valve according to an embodiment of the present invention.

[0037] In the above figure: 1-valve body, 11-inlet arc, 12-valve body sealing surface, 13-flow arc, 14-outlet arc, 15-positioning groove, 16-threaded hole; 2-valve plate, 21-sealing plate, 22-limiting boss, 23-valve plate shaft, 24-stud; 3-spring; 4-flow guide support, 41-sleeve, 42-spring groove, 43-flow guide cover, 44-support rod, 45-positioning boss, 46-damping chamber, 47-stepped screw hole; 5-flow guide nut, 51-flow guide part, 52-damping column, 53-notch. DETAILED DESCRIPTION

[0038] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0039] like Figure 1 and Figure 2 As shown, the low-resistance slow-closing one-way valve for the pressure coupling device provided in this embodiment mainly includes a valve body 1 and a valve plate 2 coaxially installed with the valve body 1, a spring 3, a flow guide support 4 and a flow guide nut 5, etc.

[0040] As shown in Figure 3, the valve body 1 is an overall cylindrical structure with an axially extending inner cavity for fluid flow. From the inlet end to the outlet end of the valve body 1, the inner cavity wall of the valve body 1 includes, in sequence, an inlet arc portion 11, a valve body sealing surface 12, a flow arc portion 13, and an outlet arc portion 14. The inlet arc portion 11, the flow arc portion 13, and the outlet arc portion 14 are all annular arc surfaces, and they smoothly transition with the adjacent wall surfaces.

[0041] The inlet arc 11 is closest to the inlet end of the valve body 1 and mainly guides the fluid from the pipeline into the one-way valve. The inlet arc 11 starts from the inlet end of the valve body 1, gradually narrows, and then gradually expands to transition to the valve body sealing surface 12.

[0042] The valve body sealing surface 12 smoothly transitions from the inlet arc portion 11 and is designed to mate with the valve plate sealing surface of the valve plate 2 to form a sealed state when the one-way valve is closed. The valve body sealing surface 12 and the valve plate sealing surface preferably utilize a linear seal structure. Furthermore, considering manufacturing costs, the valve body sealing surface 12 is preferably a conical surface, and the valve plate sealing surface is preferably an arc surface. This enhances the sealing effect and reduces fluid leakage. This is particularly suitable for the large pressure differential conditions found in mine cooling systems. Furthermore, the seal also exhibits a certain degree of self-compensation as the sealing surface wears away.

[0043] The flow arc 13 smoothly transitions into the valve body sealing surface 12, gradually expanding and then narrowing from the inlet end of the valve body 1 toward the outlet end. An annular flow channel is formed between the flow arc 13, the valve plate 2, and the flow guide cover 43 in the flow guide support 4. As a preferred embodiment, the dimensions of the flow arc 13 are designed to ensure that the cross-section of the annular flow channel is as uniform as possible, thereby ensuring that the fluid flow area remains substantially unchanged when the one-way valve is fully open. This helps maintain a constant low fluid flow resistance and prevents increases in localized flow resistance.

[0044] The outflow arc 14 smoothly transitions from the flow-through arc 13, guiding fluid out of the one-way valve. The outflow arc 14 gradually tapers from the inlet end of the valve body 1 toward the outlet end, forming an annular flow path between the outflow arc 14 and the flow-guiding support 4. In a preferred embodiment, the dimensions of the outflow arc 14 and the flow guide shroud 43 in the flow-guiding support 4 are kept as consistent as possible, ensuring a substantially constant flow area throughout the entire one-way valve.

[0045] The outlet end surface of the valve body 1 is provided with a positioning groove 15, which is axially connected to the outlet arc portion 14. The inner diameter of the positioning groove 15 matches the outer diameter of the positioning boss 45 of the flow guide support 4, ensuring high coaxiality during the installation of the flow guide support 4. The positioning groove 15 also includes a number of circumferentially evenly distributed threaded holes 16. These threaded holes 16 correspond to the stepped screw holes 47 of the flow guide support 4, allowing the flow guide support 4 to be secured to the valve body 1 via mounting screws.

[0046] like Figure 4 As shown in the figure, as a preferred embodiment, with the valve body sealing surface 12 as a reference, the angle between the tangent of the flow arc 13 and the axial direction of the valve body 1 is not less than 45° and not more than 90°, with 65±5° being preferred. This angle range prevents the abnormal situation where the direction of the resultant impact force of the fluid on the valve plate is opposite to the direction of fluid flow, effectively ensuring the subsequent rapid opening of the valve plate 2; it also ensures that the fluid always flows in one direction along the one-way valve, avoiding backflow and dead space.

[0047] As shown in FIG5 , the guide support 4 is mainly composed of a sleeve 41 , a guide cover 43 , a support rod 44 , a positioning boss 45 and a damping chamber 46 . The sleeve 41 , the guide cover 43 , the positioning boss 45 and the damping chamber 46 are all coaxially arranged.

[0048] The shaft sleeve 41 is a cylindrical structure located inside the valve body 1 and is mainly used to install the valve plate 2. The inner diameter of the shaft sleeve 41 matches the diameter of the valve plate shaft 23 of the valve plate 2, so that the valve plate shaft 23 can slide linearly relative to the shaft sleeve 41.

[0049] The deflector 43 is positioned outside the sleeve 41 and within the valve body 1. Its diameter gradually increases from near the positioning boss 45 to away from it. It cooperates with the inner wall of the valve body 1 to form an annular flow path. It is preferably designed to ensure that the flow area of the fluid remains substantially unchanged when the one-way valve is open, thereby reducing eddy currents and achieving a flow-guiding and drag-reducing effect. The outer diameter of the smaller end of the deflector 43 is smaller than the inner diameter of the positioning boss 45.

[0050] The positioning boss 45 is an annular plate with an inner diameter larger than the outer diameter of the smaller diameter end of the deflector 43. The outer diameter of the positioning boss 45 matches the inner diameter of the positioning recess 15 of the valve body 1. Once installed and secured, this ensures high coaxiality between the valve body 1 and the deflector support 4, thereby ensuring a seal between the valve plate 2 and the valve body 1. The positioning boss 45 is provided with a stepped screw hole 47 corresponding to the threaded hole 16 of the valve body 1. This allows the deflector support 4 to be screwed to the valve body 1. The stepped screw hole 47 prevents the screw head from protruding from the end face of the valve body 1, thereby ensuring proper clamping installation of the one-way valve.

[0051] The positioning boss 45 is fixedly connected to the small-diameter end of the deflector 43 by several circumferentially spaced support rods 44. Preferably, the support rods 44 have an elliptical cross-section to reduce drag. The support rods 44 divide the annulus between the positioning boss 45 and the deflector 43 into several sector-shaped cavities for fluid circulation. A closed structure exists between the small-diameter end of the deflector 43 and the sleeve 41. This closed structure, facing the interior of the valve body 1, features a spring slot 42 for retaining the spring 3.

[0052] The damping chamber 46 is located outside the valve body 1 and is connected to the positioning boss 45 via the support rod 44. The damping chamber 46 is axially connected to the sleeve 41 and is used to allow the damping column 52 of the guide nut 5 to slide axially. The inner diameter of the damping chamber 46 is larger than the outer diameter of the damping column 52, thereby forming an annular gap structure. During the closing process of the valve plate 2, the damping column 52 moves synchronously with the valve plate shaft 23, squeezing the fluid in the damping chamber 46 out through the annular gap structure between the damping chamber 46 and the damping column 52 (as well as the smaller annular gap structure between the sleeve 41 and the valve plate shaft 23). Due to the limited flow area of the annular gap structure, the closing speed of the valve plate 2 is reduced, achieving a slow closing effect. The depth of the damping chamber 46 is preferably such that when the one-way valve is in the fully open state, the damping column 52 of the guide nut 5 is still partially within the damping chamber 46.

[0053] As shown in Figure 6(a), the valve plate 2 includes a coaxially arranged sealing plate 21, a limiting boss 22, a valve plate shaft 23, and a stud 24. The valve plate shaft 23 axially extends through the sleeve 41 of the flow guide support 4. The diameter of the valve plate shaft 23 matches the inner diameter of the sleeve 41, allowing the valve plate shaft 23 to slide linearly relative to the sleeve 41. The stud 24 is located at the end of the valve plate shaft 23 outside the valve body 1. The outer thread diameter of the stud 24 is smaller than the diameter of the valve plate shaft 23 and is used to securely connect the flow guide nut 5. The sealing plate 21 is connected to the end of the valve plate shaft 23 inside the valve body 1. The separation and contact between the sealing plate 21 and the valve body 1 form the open and closed states of the one-way valve. The outer diameter of the sealing plate 21 is larger than the outer diameter of the large-diameter end of the flow guide cover 43, allowing the flow guide cover 43 to limit the valve plate 2 when the one-way valve is in the fully open state. The limiting boss 22 is provided between the sealing plate 21 and the valve plate shaft 23 . The diameter of the limiting boss 22 is larger than the diameter of the valve plate shaft 23 and is used for limiting the installation of the spring 3 .

[0054] The sealing plate 21 is a cylindrical flat plate structure, and a valve plate sealing surface is provided on the outer edge of its end surface facing away from the valve plate shaft 23. The valve plate sealing surface is preferably an arc surface, which cooperates with the conical surface of the valve body sealing surface 12 to form a linear sealing structure, as shown in Figure 6 (b).

[0055] Spring 3 is mounted outside of stop boss 22 and sleeve 41. One end of spring 3 is positioned by stop boss 22 of valve plate 2, and the other end is positioned by spring slot 42 of flow guide support 4. Spring 3 is primarily used to provide preload force for the one-way valve, ensuring that valve plate 2 closes promptly when fluid backflows, thereby preventing backflow.

[0056] As shown in Figure 7, the guide nut 5 includes a guide part 51 and a damping column 52 that are integrally connected. The guide part 51 is a conical structure with rounded corners at the tip. The small diameter end of the conical structure faces away from the valve plate shaft 23, while the large diameter end is integrally connected to the damping column 52. The guide part 51 forms an arc surface to achieve a smooth transition, which is used for reverse flow guidance to reduce flow resistance. The damping column 52 is a cylindrical structure as a whole, and its outer diameter is smaller than the inner diameter of the damping cavity 46 of the guide support 4, thereby cooperating with the damping cavity 46 to form a slow-closing structure. One end of the damping column 52 is integrally connected to the guide part 51, and the center of the other end is provided with an internal threaded hole along the axial direction. The internal threaded hole matches the size of the stud 24 of the valve plate 2 to achieve a fastening connection between the two. The outer edge of one end of the damping column 52, facing the valve plate shaft 23, is provided with a plurality of circumferentially evenly distributed notches 53. While ensuring that the damping column 52 does not separate from the damping chamber 46, it can prevent the valve plate 2 from exerting a damping and slow-closing effect during the initial closing phase, thereby achieving the effect of rapid initial closing and slow closing during the final phase. There are no strict requirements for the shape of the notches 53; they can simply destroy the complete annular gap structure at the end of the damping column 52 without destroying the overall cylindrical structure of the damping column 52. In addition, the damping column 52 of the guide nut 5 always maintains a portion of its structure within the damping chamber 46. The damping column 52 also provides auxiliary support for the valve plate 2, improving the coaxiality of the valve plate 2 and the valve body 1.

[0057] When the one-way valve of the present invention is used in a valve-controlled pressure coupling device in a mine cooling system, it can be divided into two types: a response end and a drive end for installation and use.

[0058] For a one-way valve installed in the forward direction at the response end, the fluid flows through the one-way valve in the forward direction, and self-response opening and closing is achieved by relying on the fluid pressure difference. When the valve is in the closed state, the spring 3 is in the minimum compression state. As the fluid flow increases, the displacement of the valve plate 2 increases, and the valve gradually opens until it is fully opened. At this time, the spring 3 is in the maximum compression state, and the one-way valve constructs an annular flow channel with a basically constant fluid flow area for fluid flow, and the overall flow resistance remains constant at a low value. When the valve gradually closes, the displacement of the valve plate 2 decreases, the compression of the spring 3 decreases, but the movement speed of the valve plate 2 gradually increases. At this time, the damping column 52 squeezes the fluid in the damping chamber 46 and flows out through the annular gap structure. Because the flow area of the annular gap structure is limited, the movement speed of the valve plate 2 will decrease, thereby achieving the effect of slowly closing the valve plate 2 and slowing down the impact of the sealing surface.

[0059] For a one-way valve with the drive end installed in reverse, the fluid flows in the reverse direction through the one-way valve. When the valve needs to be opened, the external drive structure (such as the drive rod) is in close contact with the surface of the sealing plate 21 of the valve plate 2, thereby pushing the valve plate 2 to overcome the resistance of the spring 3 and other factors to open, and the fluid flows in the opposite direction. The guide nut 5 and the guide cover 43 of the guide support 4 play a dual guiding role, reducing the resistance to fluid flow. When the valve needs to be closed, the drive rod is quickly withdrawn, the displacement of the valve plate 2 gradually decreases, the compression of the spring 3 decreases, but the movement speed of the valve plate 2 gradually increases. At this time, the damping column 52 squeezes the fluid in the damping chamber 46 and flows out through the annular gap structure. Due to the limited flow area of the annular gap, the movement speed of the valve plate 2 will decrease, thereby achieving the effect of slowly closing the valve plate 2 and slowing down the impact of the sealing surface.

[0060] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the present invention and the claims. These all fall within the scope of protection of the present invention.

Claims

1. A low-resistance slow-closing one-way valve for a pressure coupling device, characterized in that: It includes a valve body and a flow guide support member, a valve plate, a spring and a flow guide nut coaxially installed with the valve body; The valve body has an axially through inner cavity for fluid flow, and the inner cavity wall includes an inlet arc portion, a valve body sealing surface, a flow arc portion and an outlet arc portion in sequence from the inlet end to the outlet end, and the transition between each portion is smooth; the flow arc portion gradually expands in diameter and then gradually shrinks in diameter from the inlet end to the outlet end of the valve body, so as to achieve a substantially unchanged fluid flow area when the one-way valve is in a fully open state; the outlet end face of the valve body is provided with a positioning groove, and the positioning groove is axially connected to the outlet arc portion; The flow guide support member includes a positioning boss installed in the positioning groove, the positioning boss is fixedly connected to the valve body by a fastening screw; the positioning boss is connected to the flow guide cover and the damping chamber via a support rod, the flow guide cover is located inside the valve body, and the damping chamber is located outside the valve body; a shaft sleeve is provided inside the flow guide cover, and a spring groove is provided on the surface of the closed structure between the shaft sleeve and the flow guide cover; the damping chamber is axially connected to the shaft sleeve and is used for the axial sliding of the flow guide nut; The valve plate includes a valve plate shaft, which is installed in the shaft sleeve and can slide axially relative to the shaft sleeve; the end of the valve plate shaft located inside the valve body is connected to the sealing plate, and the end of the valve plate shaft located outside the valve body is connected to the guide nut; the side of the sealing plate facing the valve plate shaft is limited by the guide cover, and the side of the sealing plate facing away from the valve plate shaft is provided with a valve plate sealing surface, and a seal is formed when the valve plate sealing surface contacts the valve body sealing surface; a limiting boss is provided between the sealing plate and the valve plate shaft, and the limiting boss is used to limit the installation spring; The spring is mounted on the limiting boss and the outside of the sleeve, with one end of the spring positioned by the limiting boss and the other end positioned by the spring slot; The guide nut includes a guide part and a damping column that are integrally connected; the guide part is a conical structure with a rounded tip to achieve a smooth transition of the guide part as a whole; the outer diameter of the damping column is smaller than the inner diameter of the damping cavity, thereby cooperating with the damping cavity to form a slow-closing structure.

2. A low-resistance slow-closing one-way valve for a pressure coupling device according to claim 1, characterized in that: The inlet arc portion starts from the inlet end of the valve body and gradually shrinks, then gradually expands in diameter and transitionally connects with the sealing surface of the valve body.

3. A low-resistance slow-closing one-way valve for a pressure coupling device according to claim 1, characterized in that: Taking the valve body sealing surface as a reference, the angle between the tangent of the flow arc and the axial direction of the valve body is not less than 45° and not more than 90°.

4. A low-resistance slow-closing one-way valve for a pressure coupling device according to claim 1, characterized in that: The outflow arc portion gradually narrows from the inlet end to the outlet end of the valve body, so that the fluid flow area remains substantially unchanged when the one-way valve is in a fully open state.

5. A low-resistance slow-closing one-way valve for a pressure coupling device according to claim 1, characterized in that: The inner diameter and the outer diameter of the air guide cover gradually increase from a direction close to the positioning boss to a direction away from the positioning boss.

6. A low-resistance slow-closing one-way valve for a pressure coupling device according to claim 1, characterized in that: The support rods are evenly distributed circumferentially and radially extended and are arranged between the positioning boss and the air guide cover. The fan-shaped cavity between the positioning boss and the air guide cover is used for fluid circulation. The cross section of the support rods is elliptical.

7. A low-resistance slow-closing one-way valve for a pressure coupling device according to claim 1, characterized in that: The valve body sealing surface is a conical surface, and the valve plate sealing surface is an arc surface, so as to achieve line sealing cooperation between the valve body sealing surface and the valve plate sealing surface.

8. A low-resistance slow-closing one-way valve for a pressure coupling device according to claim 1, characterized in that: The outer diameter of the sealing plate is greater than the maximum outer diameter of the flow guide cover, so that when the one-way valve is in a fully open state, the flow guide cover can limit the valve plate.

9. A low-resistance slow-closing one-way valve for a pressure coupling device according to claim 1, characterized in that: A stud is provided at the end of the valve plate shaft outside the valve body; the small diameter end of the guide part faces away from the valve plate shaft and the large diameter end is integrally connected to the damping column; the damping column is axially provided with an internal threaded hole toward the center of one end of the valve plate shaft, and the internal threaded hole matches the stud of the valve plate; the fixed connection between the valve plate shaft and the guide nut is achieved by the threaded connection between the stud and the internal threaded hole.

10. A low-resistance slow-closing one-way valve for a pressure coupling device according to claim 1, characterized in that: The outer edge of one end of the damping column facing the valve plate shaft is provided with a plurality of circumferentially evenly distributed notches; the damping column always keeps a part of its structure within the damping cavity to provide auxiliary support for the valve plate.

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