High-pressure fluid one-way valve

Abstract

The high-pressure fluid one-way valve comprises a valve body, a valve seat, a valve element and a connecting mechanism, the valve body is provided with a through cavity, the through cavity comprises a first mounting cavity, a second mounting cavity and a flow channel cavity, at least part of the valve seat is arranged in the first mounting cavity, and the valve seat is provided with a fluid channel; the valve element is arranged in the flow channel cavity and comprises a valve clack, a sealing piece and an elastic piece, the valve clack is arranged between the valve seat and the elastic piece, and the sealing piece is arranged on the peripheral wall of the valve clack in a sleeving mode; the valve clack comprises a plurality of flow limiting parts, the diameters of the multiple flow limiting parts are gradually increased in the direction from the first mounting cavity to the second mounting cavity, and the multiple flow limiting parts are matched with the sealing piece to shield the fluid channel; the connecting mechanism comprises a first connecting assembly arranged in the first mounting cavity and a second connecting assembly arranged in the second mounting cavity, and the first connecting assembly abuts against the valve seat so that sealing can be achieved between the valve seat and the valve element. The one-way valve has the advantages that the service life can be prolonged, and meanwhile the sealing performance of the one-way valve is effectively guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of fluid control, and more specifically, to a high-pressure fluid check valve. Background Technology

[0002] High-pressure fluid technology is widely used in modern industry, such as the extraction of oil, natural gas, and shale oil; power generation from thermal, hydro, and nuclear sources; hydrogen transportation and storage; aerospace; the automotive industry; and chemical and engineering industries. As a key component of fluid control booster systems, the high-pressure fluid check valve's reverse low-pressure sealing performance and service life directly affect the reliability and operating costs of the fluid control booster system.

[0003] Existing high-pressure fluid check valves employ two types of reverse shut-off mechanisms. The first is a soft seal method using an O-ring and a metal component. While soft seals offer better sealing performance, the O-ring groove on the metal valve disc of the existing soft-seal check valve core has a straight groove structure and a large opening. Under operating conditions such as high pressure (60000 PSI), high flow rate, large volume, and high-frequency opening and closing pulse impacts, the O-ring and valve disc are easily damaged by the large fluid force impact at the check valve seat outlet, resulting in a short service life. The second type is a hard seal method using a metal ball or ceramic ball and a metal component. Although hard-seal check valves have a longer service life than soft-seal ones, their reverse low-pressure sealing performance is lower. A certain pressure is required at the rear end of the check valve core to ensure a seal, which can easily lead to unreliable sealing of the check valve core. This not only affects the conversion efficiency of the high-pressure fluid boosting system from low-pressure to high-pressure fluid but also affects the pressure-holding function of the fluid boosting system.

[0004] Regarding the aforementioned technical measures, existing high-pressure fluid check valves suffer from drawbacks such as short service life and unreliable sealing. Summary of the Invention

[0005] This application provides a high-pressure fluid check valve that can improve service life while effectively ensuring the sealing performance of the check valve.

[0006] The high-pressure fluid check valve provided in this application adopts the following technical solution:

[0007] A high-pressure fluid check valve, comprising:

[0008] The valve body is provided with a through cavity, the through cavity including a first mounting cavity, a second mounting cavity and a flow channel cavity, the flow channel cavity being located between the first mounting cavity and the second mounting cavity;

[0009] A valve seat, at least partially disposed in the first mounting cavity, wherein the valve seat is provided with a fluid passage;

[0010] A valve core is disposed within the flow channel cavity. The valve core includes a valve disc, a sealing element, and an elastic element. The valve disc is disposed between the valve seat and the elastic element, and the sealing element is sleeved on the outer peripheral wall of the valve disc. The valve disc includes multiple flow-limiting parts, the diameter of which gradually increases along the direction from the first mounting cavity to the second mounting cavity. The multiple flow-limiting parts cooperate with the sealing element to block the fluid channel.

[0011] A connecting mechanism for connecting a pipeline, the connecting mechanism including a first connecting component and a second connecting component, the first connecting component being disposed in a first mounting cavity and abutting against the valve seat to achieve a seal between the valve seat and the valve core, and the second connecting component being disposed in a second mounting cavity.

[0012] In some technical solutions, the multiple flow limiting parts include a first flow limiting part, a second flow limiting part, and a third flow limiting part, the diameters of the first flow limiting part, the second flow limiting part, and the third flow limiting part increase sequentially, the first flow limiting part is close to the valve seat, the third flow limiting part is close to the seal, and the seal is disposed on the side of the third flow limiting part away from the first flow limiting part.

[0013] In some technical solutions, the flow limiting part is provided with multiple flow channel grooves, which are spaced apart and evenly distributed along the circumference of the flow limiting part.

[0014] In some technical solutions, a first inner conical sealing surface and a second inner conical sealing surface are respectively provided at both ends of the fluid channel. The first inner conical sealing surface is used to connect with the pipeline to form a hard seal.

[0015] The valve disc further includes a first connecting part and a second connecting part. The first connecting part is located between the flow limiting part and the second connecting part, and the sealing element is located between the first connecting part and the flow limiting part. The first connecting part is provided with a first contact surface that mates with the second inner cone sealing surface at one end near the flow limiting part. After the second inner cone sealing surface is in contact with the first contact surface, the sealing element and the second inner cone sealing surface form a soft seal.

[0016] In some technical solutions, the end of the second inner cone sealing surface closest to the first inner cone sealing surface is provided with a relief slope. The relief slope is used to avoid the third flow limiting part so that the first contact surface can be properly contacted with the second inner cone sealing surface.

[0017] In some technical solutions, the peripheral wall of the first connecting part is provided with a plurality of flow channel holes, and the plurality of flow channel holes are spaced apart and evenly distributed along the peripheral wall of the first connecting part; the flow channel holes are configured as oblique holes to allow fluid to flow through quickly.

[0018] In some technical solutions, along the direction from the first mounting cavity to the second mounting cavity, the flow channel cavity includes an inlet flow channel cavity, a first receiving cavity, a second receiving cavity, and an outlet flow channel cavity, and the diameters of the inlet flow channel cavity, the first receiving cavity, the second receiving cavity, and the outlet flow channel cavity gradually decrease, the diameter of the outlet flow channel cavity is smaller than the diameter of the second receiving cavity, and the outlet flow channel cavity is connected to the second receiving cavity;

[0019] The first receiving cavity is used to install the second connecting part and forms a clearance fit with the second connecting part. The elastic element is disposed in the second receiving cavity and abuts against the end wall of the second receiving cavity.

[0020] In some technical solutions, the valve disc is provided with a sealing groove for accommodating the sealing element. The sealing groove includes a first arc segment, a first straight groove segment, a second arc segment, and a second straight groove segment. The first straight groove segment is located between the first arc segment and the second arc segment, and the second straight groove segment is located on the side of the second arc segment away from the first straight groove segment. The first arc segment, the first straight groove segment, the second arc segment, and the second straight groove segment are connected in sequence.

[0021] In some technical solutions, an inlet sealing cone surface is provided at the junction of the first mounting cavity and the inlet flow channel cavity, and a second contact surface is provided at one end of the valve seat near the valve disc. The second contact surface and the inlet sealing cone surface are in contact to maintain a seal.

[0022] An outlet sealing cone surface is provided at the junction of the second mounting cavity and the outlet flow channel cavity; the outlet sealing cone surface maintains a seal when it is in contact with the pipe.

[0023] In some technical solutions, a limiting surface is provided at the junction of the first receiving cavity and the second receiving cavity, and the distance between the limiting surface and the central axis of the valve seat gradually decreases along the direction from the first receiving cavity to the second receiving cavity.

[0024] In some technical solutions, the first connecting assembly includes a valve seat pressure member, a first pressure cap, and a first threaded sleeve. The valve seat pressure member is disposed in the first mounting cavity and threadedly connected to the valve body, and the valve seat pressure member abuts against the valve seat so that the second contact surface forms a seal with the inlet sealing cone surface. The first pressure cap is threadedly connected to the valve seat pressure member, and the first pressure cap is sleeved outside the first threaded sleeve so that the pipeline abuts against the first inner cone sealing cone surface to form a seal.

[0025] In some technical solutions, the second connecting assembly includes a second gland and a second threaded sleeve. The second gland is disposed in the second mounting cavity and threadedly connected to the valve body. The second gland is sleeved outside the second threaded sleeve so that the pipeline abuts against the outlet sealing cone surface to form a seal.

[0026] In some technical solutions, the first mounting cavity is provided with a first leak detection hole, which is located near the inlet sealing cone surface to detect whether the second mating surface is sealed with the inlet sealing cone surface;

[0027] The second mounting cavity is provided with a second leak detection hole, which is located near the outlet sealing cone surface to detect whether the outlet sealing cone surface is sealed to the pipeline.

[0028] The valve seat pressure component inlet mounting hole is provided with a third leak detection hole, which is located close to the first inner cone sealing cone surface to detect whether the first inner cone sealing cone surface is sealed to the pipeline.

[0029] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0030] When pressurization is required, the shut-off valve at the inlet of the high-pressure fluid check valve is opened, the system pipeline is opened, and the high-pressure fluid equipment draws in low-pressure fluid and converts it into high-pressure fluid (up to 60,000 PSI) for output. The high-pressure fluid enters the fluid channel in the valve seat through the first connecting component, and then flows through multiple flow-limiting parts with progressively increasing diameters. After being blocked or significantly restricted by multiple flow-limiting parts, the fluid growth is slow and the impact force is mitigated. Only a very small portion of the fluid passes through the gap between the flow-limiting part and the fluid channel and acts on the seal. The deformation of the seal after being compressed is small. When the fluid accumulates enough to cause large deformation of the seal, the valve core has disengaged from the valve seat, so that the high-pressure fluid check valve is in the open state. At this time, the seal is not squeezed or pulled by the valve seat. On the other hand, the fluid flows quickly from the valve disc, avoiding the long-term action of large fluid forces on the valve disc, effectively reducing the radial shear stress and axial bending stress of the valve disc, thereby improving the service life of the valve disc.

[0031] When the actuator cavity is full of fluid or when the inlet of the high-pressure fluid check valve stops supplying fluid to release pressure, the fluid pressure at the outlet of the high-pressure fluid check valve is higher than the pressure at the valve core. At this time, the valve core is subjected to the fluid force at the rear end and the reset force of the elastic element, and moves to the left along the axial direction to quickly reset. Multiple flow-limiting parts with gradually increasing diameters block the fluid passage. At this time, most of the fluid is blocked, and only a very small amount of fluid passes through the gap between the flow-limiting part and the fluid passage. Therefore, only a very small amount of deformation of the seal is needed to fill the gap and seal it, thus the deformation of the seal is small, which improves the service life of the seal. In summary, the combination of multiple flow-limiting parts and seals in this application can improve the service life of the high-pressure fluid check valve, while effectively ensuring the sealing performance of the high-pressure fluid check valve. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0033] Figure 1 This is a cross-sectional view of the overall structure of a high-pressure fluid check valve disclosed in an embodiment of this application;

[0034] Figure 2 This is a structural cross-sectional view of a high-pressure fluid check valve, as disclosed in an embodiment of this application, highlighting the valve body.

[0035] Figure 3 This is a structural cross-sectional view of a high-pressure fluid check valve with a prominent valve seat, as disclosed in an embodiment of this application.

[0036] Figure 4 This is a schematic diagram of the structure of a high-pressure fluid check valve with a prominent valve disc, as disclosed in an embodiment of this application.

[0037] Figure 5 This is a cross-sectional view of the structure of a high-pressure fluid check valve with a prominent valve disc, as disclosed in an embodiment of this application.

[0038] Figure 6 For is Figure 5 A magnified view of a section at point A in the middle;

[0039] Figure 7 This is a cross-sectional view of the protruding valve seat pressure component of a high-pressure fluid check valve disclosed in an embodiment of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100. Valve body; 110. First mounting cavity; 111. First leak detection hole; 120. Flow channel cavity; 121. Inlet flow channel cavity; 122. First receiving cavity; 123. Second receiving cavity; 124. Outlet flow channel cavity; 125. Inlet sealing cone surface; 126. Outlet sealing cone surface; 127. Limiting surface; 130. Second mounting cavity; 131. Second leak detection hole;

[0042] 200, Valve seat; 210, Fluid passage; 211, First inner cone sealing surface; 212, Second inner cone sealing surface; 213, Clearance slope; 220, Second contact surface;

[0043] 300, Valve core; 310, Valve disc; 311, Flow limiting part; 3111, First flow limiting part; 3112, Second flow limiting part; 3113, Third flow limiting part; 3114, Flow channel groove; 312, First connecting part; 3121, First mating surface; 3122, Flow channel hole; 313, Second connecting part; 3131, Receiving groove; 314, Sealing groove; 3141, First arc segment; 3142, First straight groove segment; 3143, Second arc segment; 3144, Second straight groove segment; 320, Sealing element; 330, Elastic element;

[0044] 400. Connecting mechanism; 410. First connecting assembly; 411. Valve seat pressure piece; 4111. Inlet mounting hole; 4112. Outlet mounting hole; 4113. Third leak detection hole; 412. First pressure cap; 413. First threaded sleeve; 420. Second connecting assembly; 421. Second pressure cap; 422. Second threaded sleeve. Detailed Implementation

[0045] The present application will be further described in detail below with reference to the accompanying drawings.

[0046] This application provides a high-pressure fluid check valve that can improve service life while effectively ensuring the sealing performance of the check valve.

[0047] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0048] Please see Figure 1 This is one embodiment of the high-pressure fluid check valve in this application. The high-pressure fluid check valve includes a valve body 100, a valve seat 200, a valve core 300, and a connecting mechanism 400 for connecting to a pipeline. The valve seat 200 and the valve core 300 are disposed inside the valve body 100, and the valve seat 200 and the valve core 300 cooperate to achieve a seal. When the high-pressure fluid check valve is in a closed state to block the flow of fluid, the valve seat 200 and the valve core 300 are separated, and the high-pressure fluid check valve is in an open state to maintain the flow of fluid.

[0049] Please see Figure 1 and Figure 2 Specifically, the valve body 100 is provided with a through cavity, which includes a first mounting cavity 110, a second mounting cavity 130, and a flow channel cavity 120. The first mounting cavity 110 is located at the left end of the valve body 100, the second mounting cavity 130 is located at the right end of the valve body 100, and the flow channel cavity 120 is located between the first mounting cavity 110 and the second mounting cavity 130. The volume of the flow channel cavity 120 is smaller than that of the first mounting cavity 110 and the second mounting cavity 130. The valve seat 200 is at least partially disposed in the first mounting cavity 110, the valve core 300 is disposed in the flow channel cavity 120, the first connecting assembly 410 is disposed in the first mounting cavity 110, and the first connecting assembly 410 abuts against the valve seat 200 to achieve a seal between the valve seat 200 and the valve core 300. The second connecting assembly 420 is disposed in the second mounting cavity 130.

[0050] Please see Figures 3 to 5 The valve seat 200 is provided with a fluid passage 210. The valve core 300 includes a valve disc 310, a seal 320, and an elastic element 330. The valve disc 310 is disposed between the valve seat 200 and the elastic element 330, and the seal 320 is sleeved on the outer peripheral wall of the valve disc 310. The valve disc 310 includes a plurality of flow limiting parts 311. The diameter of the plurality of flow limiting parts 311 gradually increases along the direction from the first mounting cavity 110 to the second mounting cavity 130. The plurality of flow limiting parts 311 cooperate with the seal 320 to block the fluid passage 210.

[0051] For ease of understanding, it should be noted that the fluid flow direction is from the first mounting cavity 110 to the second mounting cavity 130. Existing soft-seal check valves lack flow restriction and pressure-reducing buffering of fluid force impact, or have short flow-limiting and pressure-reducing times. The fluid force still exhibits abrupt increases or decreases, resulting in extremely high fluid force acting on the sealing ring. When the valve core 300 is open or closed, the sealing ring is repeatedly squeezed and pulled by this large fluid force, causing significant deformation and ultimately wear and damage. This leads to valve core 300 sealing failure, resulting in a short service life and poor sealing performance for the check valve. Existing hard-seal check valves have poor reverse low-pressure sealing performance. The valve core 300 requires ≥2000 PSI to form a good seal. When the pressure is below 2000 PSI, the valve core 300 seal is unreliable, causing backflow of pressure at the downstream end of the check valve. Although hard-seal check valves have a longer service life than soft-seal valves, their reverse low-pressure sealing performance is lower.

[0052] Understandably, when pressurization is required, the shut-off valve at the inlet of the high-pressure fluid check valve is opened, the system pipeline is opened, and the high-pressure fluid equipment draws in low-pressure fluid and converts it into high-pressure fluid (up to 60,000 PSI) for output. The high-pressure fluid passes through the first connecting component 410 and then enters the fluid channel 210 in the valve seat 200. It then flows through multiple flow-limiting sections 311 with progressively increasing diameters. Due to the blockage or significant flow restriction by the multiple flow-limiting sections 311, the fluid growth is slow and the impact force is mitigated. Only a very small portion of the fluid passes through the flow-limiting section 311 and interacts with the fluid. The gap in channel 210 acts on the seal 320, and the deformation of the seal 320 after being compressed is small. When the fluid accumulates enough to cause large deformation of the seal 320, the valve core 300 has disengaged from the valve seat 200 so that the high-pressure fluid check valve is in the open state. At this time, the seal 320 is not squeezed or pulled by the valve seat 200. On the other hand, the fluid flows quickly from the valve disc 310, avoiding the large fluid force acting on the valve disc 310 for a long time, effectively reducing the radial shear stress and axial bending stress of the valve disc 310, thereby improving the service life of the valve disc 310.

[0053] When the actuator cavity is full of fluid or when the inlet of the high-pressure fluid check valve stops supplying fluid to release pressure, the fluid pressure at the outlet of the high-pressure fluid check valve is higher than the pressure at the front of the valve core 300. At this time, the valve core 300 is subjected to the fluid force at the rear end and the reset force of the elastic element 330, and moves to the left along the axial direction to quickly reset. Multiple flow-limiting parts 311 with gradually increasing diameters block the fluid passage 210. At this time, most of the fluid is blocked, and only a very small amount of fluid passes through the gap between the flow-limiting part 311 and the fluid passage 210. Therefore, only a very small amount of deformation of the sealing element 320 is needed to fill the gap to seal it. Thus, the amount of deformation of the sealing element 320 is small, which improves the service life of the sealing element 320. In summary, the cooperation of multiple flow-limiting parts 311 and sealing element 320 in this application can improve the service life of the high-pressure fluid check valve and effectively ensure the sealing performance of the high-pressure fluid check valve.

[0054] It is worth mentioning that at a low temperature of -55°C, the hardening deformation of conventional sealing rings is relatively small, resulting in their inability to properly fill the gap between valve disc 310 and valve seat 200, leading to valve core 300 sealing failure. In existing technologies, modified or low-temperature-performance fluororubbers are used to meet the -55°C operating conditions; however, these rubbers are extremely expensive, resulting in high costs for the check valve. In this application, the sealing element 320 is preferably a sealing ring. Because the deformation of the sealing element 320 under pressure is small, and the minimal deformation is sufficient to achieve a seal between valve disc 310 and valve seat 200, at -55°C, the structure of this high-pressure fluid check valve, in conjunction with the sealing element 320, can effectively fill the gap between valve disc 310 and valve seat 200, solving the problem of unreliable sealing. Simultaneously, it avoids the use of expensive modified rubbers with good low-temperature performance, effectively reducing the production cost of the check valve.

[0055] Please see Figure 1 , Figure 4 and Figure 5Furthermore, the multiple flow limiting parts 311 include a first flow limiting part 3111, a second flow limiting part 3112, and a third flow limiting part 3113. The diameters of the first flow limiting part 3111, the second flow limiting part 3112, and the third flow limiting part 3113 increase sequentially. The first flow limiting part 3111 is close to the valve seat 200, the third flow limiting part 3113 is close to the seal 320, the second flow limiting part 3112 is located between the first flow limiting part 3111 and the third flow limiting part 3113, and the seal 320 is disposed on the side of the third flow limiting part 3113 away from the first flow limiting part 3111. In this embodiment, the dimensions of the first flow limiting part 3111 and the second flow limiting part 3112 are much smaller than the dimensions of the fluid channel 210, the gap between the outer diameter of the third flow limiting part 3113 and the fluid channel 210 is 0.02-0.08mm, and the total length of the first flow limiting part 3111, the second flow limiting part 3112 and the third flow limiting part 3113 is 3-4mm.

[0056] Understandably, when the check valve is closed, the first flow limiting part 3111, the second flow limiting part 3112, and the third flow limiting part 3113 extend into the fluid channel 210. When the check valve inlet is pressurized, the fluid flowing into the fluid channel 210 is first partially limited by the first flow limiting part 3111, then further limited by the second flow limiting part 3112, and then blocked or significantly limited by the third flow limiting part 3113. At this time, the fluid growth is slow, the impact force is mitigated, and only a very small portion of the fluid passes through the gap between the first flow limiting part 3111 and the fluid channel 210 and acts on the seal 320. The seal 320 is compressed and fills the gap between the valve disc 310 and the valve seat 200 with minimal deformation. Similarly, when the pressure at the inlet of the check valve is released or the pressure at the rear end of the check valve is higher than that at the front end, the valve core 300 quickly resets and closes. The first flow limiting part 3111, the second flow limiting part 3112, and the third flow limiting part 3113 block the fluid passage 210. At this time, most of the fluid is blocked, and only a very small amount of fluid passes through the gap between the third flow limiting part 3113 and the fluid passage 210. Only a very small amount of deformation of the sealing ring is needed to block this part of the fluid, thus achieving a seal.

[0057] Furthermore, the flow-limiting section 311 is provided with multiple flow channel grooves 3114, which are spaced apart and evenly distributed along the axial direction of the flow-limiting section 311. Specifically, the flow channel grooves 3114 penetrate the first flow-limiting section 3111, the second flow-limiting section 3112, and the third flow-limiting section 3113. Three flow channel grooves 3114 are provided, and the flow channel grooves 3114 are inclined, with a groove width of 0.1-1mm.

[0058] Understandably, after the 60,000 PSI high-pressure fluid is limited and reduced in pressure by the first flow limiting part 3111, the second flow limiting part 3112, and the third flow limiting part 3113, the fluid force acting on the sealing ring is greatly reduced when the check valve is fully open. When the check valve is open, the fluid is prone to vortexing and repeated spinning at the steps when it flows through the different sizes of the first flow limiting part 3111, the second flow limiting part 3112, and the third flow limiting part 3113. Three circumferentially evenly distributed transition inclined flow channel grooves 3114 are opened through the first flow limiting part 3111, the second flow limiting part 3112, and the third flow limiting part 3113, allowing the fluid to flow along the flow channel grooves 3114, thereby eliminating the vortexing when the fluid flows through multiple flow limiting parts 311.

[0059] Please see Figure 4 and Figure 5 The valve disc 310 also includes a first connecting portion 312 and a second connecting portion 313. The first connecting portion 312 is located between the flow-limiting portion 311 and the second connecting portion 313, and the sealing member 320 is located between the first connecting portion 312 and the flow-limiting portion 311. In this embodiment, the diameter of the first connecting portion 312 is smaller than the diameter of the second connecting portion 313.

[0060] Furthermore, a first inner conical sealing surface 211 and a second inner conical sealing surface 212 are respectively provided at both ends of the fluid channel 210. The second inner conical sealing surface 212 is located at the right end of the fluid channel 210, and the first inner conical sealing surface 211 is located at the left end of the fluid channel 210, and is used to connect with the pipeline to form a hard seal. The end of the first connecting part 312 near the flow limiting part 311 is provided with a first contact surface 3121 that matches the second inner conical sealing surface 212. The slope of the first contact surface 3121 is the same as the slope of the second inner conical sealing surface 212. After the second inner conical sealing surface 212 and the first contact surface 3121 are in contact, the sealing element 320 and the second inner conical sealing surface 212 form a soft seal to further enhance the sealing performance between the valve body 100 and the valve disc 310.

[0061] In order to ensure that the first contact surface 3121 can be properly contacted with the second inner cone sealing surface 212, a relief slope 213 is provided at the end of the second inner cone sealing surface 212 that is closer to the first inner cone sealing surface 211. The relief slope 213 is used to avoid the third flow limiting part 3113, so that the first contact surface 3121 can be properly contacted with the second inner cone sealing surface 212. In this embodiment, the avoidance slope 213 is an inner conical surface of 30°-40°. The purpose is to avoid the intersection line between the third flow limiting part 3113 on the valve disc 310 and the second inner conical sealing surface 212, so that the second inner conical sealing surface 212 and the first contact surface 3121 can fit together properly. The sealing ring can better fill the gap between the valve disc 310 and the second inner conical sealing surface 212, thereby forming a better sealing effect. On the other hand, when there is no pressure at the inlet of the one-way valve and the valve core 300 is subjected to reverse high pressure, the valve core 300 is firmly pressed on the second inner conical sealing surface 212. When the pressure at the rear end of the one-way valve is released, the valve core 300 will not be stuck. At this time, the valve core 300 can open smoothly without jamming or sticking at the designed opening pressure.

[0062] Please continue reading. Figure 1 and Figure 2 To facilitate the accommodation and installation of the valve core 300, the flow channel cavity 120 includes an inlet flow channel cavity 121, a first receiving cavity 122, a second receiving cavity 123, and an outlet flow channel cavity 124 along the direction from the first mounting cavity 110 to the second mounting cavity 130. The diameters of the inlet flow channel cavity 121, the first receiving cavity 122, the second receiving cavity 123, and the outlet flow channel cavity 124 gradually decrease. The diameter of the inlet flow channel cavity 121 is smaller than the diameter of the first receiving cavity 122, and the diameter of the outlet flow channel cavity 124 is smaller than the diameter of the second receiving cavity 123. The outlet flow channel cavity 124 is connected to the second receiving cavity 123. The first receiving cavity 122 is used to install the second connecting part 313 and forms a clearance fit with the second connecting part 313.

[0063] It is understood that the valve disc 310 and the elastic element 330 can be installed into the valve body 100 from the first mounting cavity 110 (i.e., the inlet end of the valve body 100). The valve disc 310 is located in the inlet flow channel cavity 121 and the first receiving cavity 122. The right end wall of the first receiving cavity 122 limits the valve disc 310, and the right end wall of the second receiving cavity 123 limits the elastic element 330. The first receiving cavity 122 provides a guiding effect for the axial movement of the valve disc 310, so that the first flow limiting part 3111, the second flow limiting part 3112 and the third flow limiting part 3113 on the valve disc 310 are coaxial with the fluid channel 210. Thus, when the valve disc 310 is reset, the first flow limiting part 3111, the second flow limiting part 3112 and the third flow limiting part 3113 can quickly extend into the fluid channel 210 to form a sealing fit.

[0064] The elastic element 330 is disposed in the second receiving cavity 123, and the elastic element 330 abuts against the end wall of the second receiving cavity 123. In this embodiment, the first connecting part 312 is provided with a receiving groove 3131 at one end facing the elastic element 330, the left end of the elastic element 330 is located in the receiving groove 3131, and the right end of the elastic element 330 abuts against the end wall of the second receiving cavity 123. When a large amount of fluid continuously enters the fluid channel 210, the impact force causes the valve core 300 to move toward the second mounting cavity 130, while compressing the elastic element 330; when the fluid fills the actuator cavity or when the supply to the front end of the one-way valve inlet stops and depressurizes, the fluid pressure at the rear end of the one-way valve outlet is higher than the pressure at the front end of the valve core 300. Under the action of the rebound force of the elastic element 330 and the fluid force at the rear end of the one-way valve, the valve core 300 is driven to move toward the first mounting cavity 110, so that the valve disc 310 moves to the left and quickly resets to block the fluid channel 210.

[0065] Furthermore, an inlet sealing cone surface 125 is provided at the junction of the first mounting cavity 110 and the inlet flow channel cavity 121. A second contact surface 220 is provided at the end of the valve seat 200 near the valve disc 310. The second contact surface 220 and the inlet sealing cone surface 125 maintain a seal when in contact, and the second contact surface 220 and the inlet sealing cone surface 125 cooperate to form an inlet connection seal for the valve body 100. An outlet sealing cone surface 126 is provided at the junction of the second mounting cavity 130 and the outlet flow channel cavity 124. The outlet sealing cone surface 126 maintains a seal when in contact with the pipeline, and the outlet sealing cone surface 126 cooperates with the pipeline to form an outlet connection seal for the valve body 100.

[0066] An arc-shaped cone angle is provided at the junction of the inlet flow channel cavity 121 and the first receiving cavity 122 as the lead angle of the first receiving cavity 122. The purpose is to eliminate the situation where the junction of the first connecting part 312 and the second connecting part 313 (i.e., the transition profile) is flush with the junction of the inlet flow channel cavity 121 and the first receiving cavity 122 (i.e., the transition profile) when the valve disc 310 moves axially in the first receiving cavity 122. This reduces the situation where the axial sliding of the valve disc 310 is not smooth due to the abrupt change of the hole axis of the two transition profile lines, improves the smoothness of the one-way valve, and ensures the function of the one-way valve.

[0067] The right end face of the second connecting part 313 is rounded. A limiting surface 127 is provided at the junction of the first receiving cavity 122 and the second receiving cavity 123. Along the direction from the first receiving cavity 122 to the second receiving cavity 123, the distance between the limiting surface 127 and the central axis of the valve seat 200 gradually decreases. On the one hand, when the second connecting part 313 abuts against the first receiving cavity 122, there is a gap or groove that can limit the axial movement of the valve disc 310. On the other hand, when the inlet of the one-way valve is depressurized, when the fluid can enter the gap between the second connecting part 313 and the first receiving cavity 122, only a small force is needed to push the valve disc 310 to quickly reset and block the fluid passage 210. This prevents the valve disc 310 from being pressed and stuck to the limiting surface 127, facilitates the rapid reset of the valve disc 310, prevents the fluid from flowing back, and achieves pressure maintenance on the actuator at the rear end of the one-way valve, thereby keeping the actuator in the open state.

[0068] The first mounting cavity 110 is provided with a first leak detection hole 111, which is located near the inlet sealing cone surface 125 to detect whether the second mating surface 220 is sealed with the inlet sealing cone surface 125. The second mounting cavity 130 is provided with a second leak detection hole 131, which is located near the outlet sealing cone surface 126 to detect whether the outlet sealing cone surface 126 is sealed with the pipeline. The first leak detection hole 111 and the second leak detection hole 131 are single-sided leak detection holes, used for leak detection to facilitate the testing of the sealing performance.

[0069] For ease of understanding, it should be noted that in existing one-way valves, whether soft-seal or hard-seal, the flow channel holes 3122 on the side of the valve disc 310 are mostly a structure of several evenly distributed straight holes. When the one-way valve is fully open, the fluid in the fluid channel 210 cannot be discharged quickly, but instead forms a vortex on the side of the valve disc 310, resulting in slow fluid flow. Since the diameter of the inlet flow channel cavity 121 is much larger than the diameter of the fluid channel 210, the fluid force acting on the valve disc 310 increases linearly and instantaneously, causing the radial shear stress and axial bending stress of the valve disc 310 to increase instantaneously. Furthermore, since the valve disc 310 is a hollow cylindrical structure, under the action of large fluid forces during the high-frequency opening and closing of the one-way valve, the valve disc 310 is prone to fatigue radial fracture, thus affecting the service life of the one-way valve.

[0070] Please see Figure 4 and Figure 5In this embodiment, the first connecting portion 312 has a plurality of flow channel holes 3122 on its peripheral wall. The plurality of flow channel holes 3122 are spaced apart and evenly distributed along the peripheral wall of the first connecting portion 312. Four flow channel holes 3122 are provided, and the flow channel holes 3122 are configured as oblique holes to allow fluid to flow quickly through the valve disc 310 and discharge towards the second mounting cavity 130. Since the cross-sectional area of ​​the inlet flow channel cavity 121 is much larger than the cross-sectional area of ​​the fluid channel 210, when the one-way valve is fully open, the pressure at the fluid channel 210 is the same as the pressure at the inlet flow channel cavity 121, resulting in the fluid force at the inlet flow channel cavity 121 being much greater than the fluid force at the fluid channel 210. With four flow channel holes 3122 provided and the length direction of the flow channel holes 3122 being axially arranged, the fluid can flow quickly along the flow channel holes 3122 to the outlet flow channel cavity 124, reducing the formation of eddies, and the fluid flows quickly through the valve disc 310 to discharge from the one-way valve.

[0071] It should be noted that the sealing ring groove on the existing soft-seal check valve disc 310 has a straight groove structure and a large opening. Under conditions such as high pressure (60000PSI), large flow, large volume, large diameter, and high frequency opening and closing, the sealing ring is easily squeezed out of the sealing ring groove by the fluid during the opening and closing process of the valve core 300, which affects the sealing effect.

[0072] Please see Figure 5 and Figure 6 The valve disc 310 is provided with a sealing groove 314 for accommodating the sealing element 320. The sealing groove 314 includes a first arc segment 3141, a first straight groove segment 3142, a second arc segment 3143, and a second straight groove segment 3144. The first straight groove segment 3142 is located between the first arc segment 3141 and the second arc segment 3143, and the second straight groove segment 3144 is located on the side of the second arc segment 3143 away from the first straight groove segment 3142. The first arc segment 3141, the first straight groove segment 3142, the second arc segment 3143, and the second straight groove segment 3144 are connected in sequence.

[0073] Please see Figure 6In this embodiment, the sealing groove 314 is similar to a dovetail groove, and is perpendicular to the first mating surface 3121. The first arc segment 3141 is a 1 / 4 semi-circular arc, and the second arc segment 3143 is an inclined small arc. The edge of the first arc segment 3141 away from the first straight groove segment 3142 is rounded. Since the first straight groove segment 3142, the second arc segment 3143, and the second straight groove segment 3144 form an inclined surface, the seal 320 will tend to slide towards the smaller size when fitted into the sealing groove 314. The 1 / 4 semi-circular arc groove on the left side of the inclined surface can effectively wrap around the seal 320 and prevent it from sliding out of the sealing groove 314. The inclined small arc on the right side of the inclined surface reduces the width of the sealing groove 314, making it easier to seal under conditions such as 60000PSI high pressure, high flow rate, large volume, high frequency opening and closing, or high temperature. When the seal 320 softens and expands, the opening of the one-way valve causes the large deformation of the seal 320 caused by the positive compression to fill the second arc segment 3143, thus preventing the seal ring from being squeezed out of the sealing groove 314. At the same time, after the 60000PSI high-pressure fluid is limited and depressurized by the first flow limiting part 3111, the second flow limiting part 3112 and the third flow limiting part 3113, even if the one-way valve is in the fully open state, the fluid force acting on the seal 320 can be greatly reduced, and the seal 320 is less likely to be squeezed out of the sealing groove 314.

[0074] Please continue reading. Figure 1 and Figure 7 The first connecting assembly 410 includes a valve seat pressure member 411, a first pressure cap 412, and a first threaded sleeve 413. The valve seat pressure member 411 is disposed in the first mounting cavity 110 and threadedly connected to the valve body 100. The valve seat pressure member 411 abuts against the valve seat 200 so that the second contact surface 220 forms a seal with the inlet sealing cone surface 125. The first pressure cap 412 is threadedly connected to the valve seat pressure member 411 and is sleeved on the outside of the first threaded sleeve 413 so that the pipeline abuts against the first inner cone sealing cone surface 211 to form a seal.

[0075] In this embodiment, the valve seat pressure member 411 has a hexagonal structure serving as a wrench position. A through hole is opened inside the valve seat pressure member 411. The left end of the valve seat pressure member 411 is an inlet mounting hole 4111 with internal threads. The internal threads of the inlet mounting hole 4111 are used to mate with the external threads on the first pressure cap 412 to install the first pressure cap 412, the first threaded sleeve 413, and the steel pipe (not shown). The right end of the valve seat pressure member 411 is an outlet mounting hole 4112. The outer peripheral wall of the valve seat pressure member 411 is provided with external threads, and the inner wall of the first mounting cavity 110 is provided with internal threads. The pre-tightening force generated by the interaction between the external threads on the valve seat pressure member 411 and the internal threads of the first mounting cavity 110 firmly fixes the second contact surface 220 to the inlet sealing cone surface 125 to form a cone surface hard seal.

[0076] Furthermore, a single-sided third leak detection hole 4113 is provided near the thread position of the inlet mounting hole 4111, which is used to detect internal leakage of the one-way valve, that is, the sealing condition between the steel pipe conical surface and the first inner conical sealing surface 211.

[0077] Please continue reading. Figure 1 The second connecting assembly 420 includes a second pressure cap 421 and a second threaded sleeve 422. The second pressure cap 421 is disposed in the second mounting cavity 130 and threadedly connected to the valve body 100. The second pressure cap 421 is sleeved on the outside of the second threaded sleeve 422 so that the pipe abuts against the outlet sealing cone surface 126 to form a seal. The inner wall of the second mounting cavity 130 is provided with internal threads, and the second pressure cap 421 is provided with external threads. The pre-tightening force generated by the interaction between the external threads on the second pressure cap 421 and the internal threads of the second mounting cavity 130 firmly fixes the cone surface of the steel pipe against the outlet sealing cone surface 126 to form a cone surface hard seal.

[0078] In this embodiment, the first pressure cap 412 and the second pressure cap 421 have the same structure. The first pressure cap 412 and the second pressure cap 421 are hexagonal structures that serve as wrench positions. Both the first pressure cap 412 and the second pressure cap 421 are provided with external threads. The first threaded sleeve 413 and the second threaded sleeve 422 have the same structure. The first threaded sleeve 413 and the second threaded sleeve 422 are shaped like rugby balls with conical ends. They are non-directional in installation and are general standard parts. The first threaded sleeve 413 and the second threaded sleeve 422 can firmly press the steel pipe and prevent leakage caused by the axial movement of the steel pipe and separation from the first inner conical sealing surface 211 or the outlet sealing conical surface 126.

[0079] It should be noted that the addition of terms such as "first," "second," and "third" to some technical feature names in this application is merely to distinguish similar objects and is not intended to limit quantity, priority, or other limitations. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0080] The various embodiments in this specification are described in a progressive or parallel manner, with each embodiment focusing on its differences from other embodiments. Similar or undescribed parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-pressure fluid check valve, characterized in that, include: The valve body is provided with a through cavity, the through cavity including a first mounting cavity, a second mounting cavity and a flow channel cavity, the flow channel cavity being located between the first mounting cavity and the second mounting cavity; A valve seat, at least partially disposed in the first mounting cavity, wherein the valve seat is provided with a fluid passage; A valve core is disposed within the flow channel cavity. The valve core includes a valve disc, a sealing element, and an elastic element. The valve disc is disposed between the valve seat and the elastic element, and the sealing element is sleeved on the outer peripheral wall of the valve disc. The valve disc includes multiple flow-limiting parts, the diameter of which gradually increases along the direction from the first mounting cavity to the second mounting cavity. The multiple flow-limiting parts cooperate with the sealing element to block the fluid channel. A connecting mechanism for connecting a pipeline, the connecting mechanism including a first connecting component and a second connecting component, the first connecting component being disposed in a first mounting cavity and abutting against the valve seat to achieve a seal between the valve seat and the valve core, and the second connecting component being disposed in a second mounting cavity.

2. The high-pressure fluid check valve according to claim 1, characterized in that, The plurality of flow limiting parts include a first flow limiting part, a second flow limiting part, and a third flow limiting part, the diameters of the first flow limiting part, the second flow limiting part, and the third flow limiting part increasing sequentially, the first flow limiting part being close to the valve seat, the third flow limiting part being close to the seal, and the seal being disposed on the side of the third flow limiting part away from the first flow limiting part.

3. The high-pressure fluid check valve according to claim 2, characterized in that, The flow limiting part is provided with multiple flow channel grooves, which are spaced apart and evenly distributed along the circumference of the flow limiting part.

4. The high-pressure fluid check valve according to claim 2, characterized in that, The fluid channel is provided with a first inner conical sealing surface and a second inner conical sealing surface at both ends, and the first inner conical sealing surface is used to connect with the pipeline to form a hard seal. The valve disc further includes a first connecting part and a second connecting part. The first connecting part is located between the flow limiting part and the second connecting part, and the sealing element is located between the first connecting part and the flow limiting part. The first connecting part is provided with a first contact surface that mates with the second inner cone sealing surface at one end near the flow limiting part. After the second inner cone sealing surface is in contact with the first contact surface, the sealing element and the second inner cone sealing surface form a soft seal.

5. The high-pressure fluid check valve according to claim 4, characterized in that, The second inner cone sealing surface extends to the end closest to the first inner cone sealing surface and is provided with a clearance slope. The clearance slope is used to avoid the third flow limiting part so that the first contact surface can be in place with the second inner cone sealing surface.

6. The high-pressure fluid check valve according to claim 4, characterized in that, The peripheral wall of the first connecting part is provided with a plurality of flow channel holes, which are spaced apart and evenly distributed along the peripheral wall of the first connecting part; the flow channel holes are configured as oblique holes to allow fluid to flow through quickly.

7. The high-pressure fluid check valve according to claim 4, characterized in that, Along the direction from the first mounting cavity to the second mounting cavity, the flow channel cavity includes an inlet flow channel cavity, a first receiving cavity, a second receiving cavity, and an outlet flow channel cavity, and the diameters of the inlet flow channel cavity, the first receiving cavity, the second receiving cavity, and the outlet flow channel cavity gradually decrease, the diameter of the outlet flow channel cavity is smaller than the diameter of the second receiving cavity, and the outlet flow channel cavity is connected to the second receiving cavity; The first receiving cavity is used to install the second connecting part and forms a clearance fit with the second connecting part. The elastic element is disposed in the second receiving cavity and abuts against the end wall of the second receiving cavity.

8. The high-pressure fluid check valve according to claim 1, characterized in that, The valve disc is provided with a sealing groove for accommodating the sealing element. The sealing groove includes a first arc segment, a first straight groove segment, a second arc segment, and a second straight groove segment. The first straight groove segment is located between the first arc segment and the second arc segment, and the second straight groove segment is located on the side of the second arc segment away from the first straight groove segment. The first arc segment, the first straight groove segment, the second arc segment, and the second straight groove segment are connected in sequence.

9. The high-pressure fluid check valve according to claim 7, characterized in that, An inlet sealing cone surface is provided at the junction of the first mounting cavity and the inlet flow channel cavity, and a second contact surface is provided at one end of the valve seat near the valve disc. The second contact surface and the inlet sealing cone surface are in contact to maintain a seal. An outlet sealing cone surface is provided at the junction of the second mounting cavity and the outlet flow channel cavity; the outlet sealing cone surface maintains a seal when it is in contact with the pipe.

10. The high-pressure fluid check valve according to claim 7, characterized in that, A limiting surface is provided at the junction of the first receiving cavity and the second receiving cavity, and the distance between the limiting surface and the central axis of the valve seat gradually decreases along the direction from the first receiving cavity to the second receiving cavity.

11. The high-pressure fluid check valve according to claim 9, characterized in that, The first connecting assembly includes a valve seat pressure member, a first pressure cap, and a first threaded sleeve. The valve seat pressure member is disposed in the first mounting cavity and threadedly connected to the valve body, and the valve seat pressure member abuts against the valve seat so that the second contact surface and the inlet sealing cone surface form a seal. The first pressure cap is threadedly connected to the valve seat pressure member, and the first pressure cap is sleeved outside the first threaded sleeve so that the pipeline abuts against the first inner cone sealing cone surface to form a seal.

12. The high-pressure fluid check valve according to claim 9, characterized in that, The second connecting assembly includes a second gland and a second threaded sleeve. The second gland is disposed in the second mounting cavity and threadedly connected to the valve body. The second gland is sleeved outside the second threaded sleeve so that the pipe abuts against the outlet sealing cone surface to form a seal.

13. The high-pressure fluid check valve according to claim 11, characterized in that, The first mounting cavity is provided with a first leak detection hole, which is located near the inlet sealing cone surface to detect whether the second mating surface is sealed with the inlet sealing cone surface; The second mounting cavity is provided with a second leak detection hole, which is located near the outlet sealing cone surface to detect whether the outlet sealing cone surface is sealed to the pipeline. The valve seat pressure component inlet mounting hole is provided with a third leak detection hole, which is located close to the first inner cone sealing cone surface to detect whether the first inner cone sealing cone surface is sealed to the pipeline.

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