A bidirectional valve

Abstract

The present application belongs to the technical field of fluid valves, and particularly relates to a bidirectional valve, which comprises a shell, a valve seat and a valve core assembly; the valve seat is provided with a flow channel hole and a first sealing surface; the valve core assembly is provided with a flow channel structure, and the flow channel structure and the flow channel hole form a first flow channel; the valve core assembly comprises a first valve core slidingly arranged in the shell, a first elastic reset member for driving the first valve core to abut against the sealing surface and close the first flow channel, a second valve core inserted in the first valve core, and a second elastic reset member for driving the second valve core to abut against the first valve core, and a second flow channel is configured to be closed when the first valve core and the second valve core abut against each other. The first valve core and the second valve core only act in the corresponding flow direction working conditions, effectively avoiding repeated impact and wear of the sealing surface and fatigue failure of a single elastic element, greatly enhancing the dynamic sealing reliability and high-frequency switching durability, and overcoming the core defects of the prior art in structural complexity, sealing life and bidirectional response balance.

Description

Technical Field

[0001] This invention belongs to the field of fluid valve technology, and specifically relates to a two-way valve. Background Technology

[0002] In fluid control systems (such as hydraulic, pneumatic, water treatment, and chemical pipelines), two-way valves serve as core control components, requiring independent on / off control of fluid in both forward and reverse directions. They are widely used in scenarios such as preventing backflow, maintaining system pressure, and switching flow directions. Currently, the industry generally adopts two types of technical solutions: First, two independent one-way valves are connected in parallel or series through external pipelines to control forward and reverse flow separately; second, a single valve core with a complex valve seat structure is used, relying on the fluid pressure difference to drive the valve core to move in both directions to achieve on / off control.

[0003] However, the above solutions have significant drawbacks: the modular structure results in a large number of parts, cumbersome assembly processes, and a bulky overall size, making it difficult to meet the urgent needs of modern equipment for compactness and lightweight design; while the single valve core solution simplifies the external structure, the valve core's movement trajectory is singular, making it difficult to accurately match the opening pressure in both directions, which can easily lead to problems such as response lag and increased impact wear on the sealing surface. Especially under high pressure differential or high frequency switching conditions, the valve core reset relies on a single elastic element, which is prone to fatigue failure leading to sealing leakage. Furthermore, during bidirectional flow switching, there are often instantaneous crossflows or opening pressure imbalances, which seriously affect system stability and control accuracy. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a two-way valve with high structural integration, strong sealing reliability, automatic independent response according to the direction of fluid flow, and balanced forward and reverse opening characteristics, so as to overcome the shortcomings of the prior art in terms of structural complexity, dynamic sealing performance and consistency of two-way control.

[0005] This application provides a two-way valve, comprising: case; A valve seat is disposed within the housing and has a flow channel hole and a first sealing surface; A valve core assembly is disposed within the housing and located on the side close to the sealing surface. The valve core assembly has a flow channel structure, and the flow channel structure and the flow channel hole form a first flow channel. The valve core assembly includes a first valve core slidably disposed within the housing, a first elastic reset member for driving the first valve core to abut against the sealing surface and close the first flow channel, a second valve core inserted into the first valve core, and a second elastic reset member for driving the second valve core to abut against the first valve core. The valve core assembly defines a second flow channel, which is configured to be closed when the first valve core and the second valve core abut against each other. The direction of the force exerted by the first elastic reset member on the first valve core is opposite to the direction of the force exerted by the second elastic reset member on the second valve core, and the opening directions of the first valve core and the second valve core correspond to opposite fluid flow directions.

[0006] Optionally, the first valve core has a groove at one end near the valve seat, and the edge of the groove is provided with a second sealing surface, and the second valve core cooperates with the second sealing surface.

[0007] Optionally, the second valve core includes: The rod is inserted into the first valve core; A plug is fixedly installed on the rod body. When the second valve core is closed, the plug is embedded in the groove and abuts against the second sealing surface.

[0008] Optionally, the second flow channel is a through hole formed on the first valve core, or a gap formed by the opposing surfaces of the first valve core and the second valve core.

[0009] Optionally, the number of through holes is multiple, and they are evenly distributed circumferentially around the axis of the first valve core.

[0010] Optionally, the rod has a reduced diameter structure, and the surface of the reduced diameter structure forms an annular gap with the inner wall of the second valve core.

[0011] Optionally, the rod body is screwed to a limit block, and the second elastic reset member is sleeved on the rod body with one end abutting against the first valve core and the other end abutting against the limit block.

[0012] Optionally, the valve seat is screwed into the housing.

[0013] Optionally, the first sealing surface and the second sealing surface are conical surfaces.

[0014] Optionally, the valve seat is nested with a sealing ring, which is interference-fitted with the housing.

[0015] Optionally, the first elastic reset member and the second elastic reset member are helical springs.

[0016] Optionally, the first valve core includes: The core has a guide hole for inserting the second valve core and a plurality of through holes surrounding the guide hole that form a second flow channel; Multiple guide blocks are distributed on the outer periphery of the core and slide in cooperation with the inner wall of the housing. The gaps between adjacent guide blocks form a flow channel structure.

[0017] The beneficial effect of this application is that by coaxially integrating the first valve core and the second valve core into a single valve core assembly, and configuring the first elastic reset member and the second elastic reset member with opposite force directions, independent sensing and precise control of forward and reverse fluids are achieved. Specifically, when the forward fluid pressure overcomes the first elastic reset member, the first valve core disengages from the valve seat sealing surface to open the first flow channel, while the second valve core remains in contact with the first valve core under the action of the second elastic reset member to close the second flow channel; when the reverse fluid pressure acts, the second valve core overcomes the displacement of the second elastic reset member relative to the first valve core to open the second flow channel, while the first valve core tightly adheres to the valve seat sealing surface under the action of the first elastic reset member to close the first flow channel. This technology physically isolates the bidirectional flow channels and ensures that the sealing actions do not interfere with each other, significantly improving integration (eliminating the need for external parallel valve groups, reducing size, and simplifying assembly). At the same time, the first and second valve cores only operate under corresponding flow conditions, effectively avoiding repeated impact wear on the sealing surface and fatigue failure of a single elastic element. This greatly enhances the reliability of dynamic sealing and the durability of high-frequency switching. In particular, it can maintain the consistency and long-term stability of bidirectional control under high pressure differential and high frequency conditions, overcoming the core defects of existing technologies in terms of structural complexity, sealing life, and bidirectional response balance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the state of the bidirectional valve when it is not in operation, as provided in the embodiments of this application. Figure 2 A schematic diagram showing the state of the first valve core of the bidirectional valve provided in this embodiment when it is open; Figure 3 A schematic diagram showing the state of the second valve core of the bidirectional valve provided in this application embodiment when it is open; Figure 4 This is a schematic diagram of the structure of the first valve core provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the second valve core with a reduced diameter provided in an embodiment of this application.

[0019] In the figure: 100, housing; 200, valve seat; 210, flow channel hole; 220, first sealing surface; 230, sealing ring; 310, first valve core; 311, core body; 3111, groove; 3112, second sealing surface; 3113, guide hole; 3114, through hole; 312, guide block; 320, first elastic reset element; 330, second valve core; 331, rod body; 332, plug; 340, second elastic reset element; 350, limit block. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] like Figures 1-5 As shown, this application provides a two-way valve, comprising: Casing 100; Valve seat 200 is disposed within housing 100 and has flow channel hole 210 and first sealing surface 220; The valve core assembly is disposed within the housing 100 and located on the side close to the sealing surface. The valve core assembly has a flow channel structure, and the flow channel structure and the flow channel hole 210 form a first flow channel. The valve core assembly includes a first valve core 310 slidably disposed within the housing 100, a first elastic reset member 320 for driving the first valve core 310 to abut against the sealing surface and close the first flow channel, a second valve core 330 inserted into the first valve core 310, and a second elastic reset member 340 for driving the second valve core 330 to abut against the first valve core 310. A second flow channel is defined within the valve core assembly, and the second flow channel is configured to close when the first valve core 310 and the second valve core 330 abut against each other. The direction of the force exerted by the first elastic reset member 320 on the first valve core 310 is opposite to the direction of the force exerted by the second elastic reset member 340 on the second valve core 330, and the opening directions of the first valve core 310 and the second valve core 330 correspond to opposite fluid flow directions.

[0022] The bidirectional valve provided in this application achieves independent sensing and precise control of forward and reverse fluids by coaxially integrating the first valve core 310 and the second valve core 330 into a single valve core assembly and configuring a first elastic reset member 320 and a second elastic reset member 340 with opposite force directions. Specifically, when the forward fluid pressure overcomes the first elastic reset member 320, the first valve core 310 disengages from the sealing surface of the valve seat 200 to open the first flow channel, while the second valve core 330 remains in contact with the first valve core 310 under the action of the second elastic reset member 340 to close the second flow channel; when the reverse fluid pressure acts, the second valve core 330 overcomes the displacement of the second elastic reset member 340 relative to the first valve core 310 to open the second flow channel, while the first valve core 310 tightly adheres to the sealing surface of the valve seat 200 under the action of the first elastic reset member 320 to close the first flow channel. This technology physically isolates the bidirectional flow channels and ensures that the sealing actions do not interfere with each other, significantly improving integration (eliminating the need for external parallel valve groups, reducing size, and simplifying assembly). At the same time, the first valve core 310 and the second valve core 330 only operate under corresponding flow conditions, effectively avoiding repeated impact wear on the sealing surface and fatigue failure of a single elastic element. This greatly enhances the reliability of dynamic sealing and the durability of high-frequency switching. In particular, it can maintain the consistency and long-term stability of bidirectional control even under high pressure differential and high frequency conditions, overcoming the core defects of existing technologies in terms of structural complexity, sealing life, and bidirectional response balance.

[0023] It should be noted that this application achieves complete physical isolation and independent sealing control of the forward and reverse flow channels by precisely inserting the second valve core 330 into the first valve core 310 to form a coaxial nested valve core assembly and configuring a dual elastic reset system with opposite force directions. Specifically, when the forward fluid acts, only the first valve core 310 actuates to open the first flow channel, while the second valve core 330 remains in close contact with the first valve core 310 under the action of the second elastic reset member 340, completely blocking the second flow channel; when the reverse fluid acts, only the second valve core 330 moves axially relative to the first valve core 310 to open the second flow channel, while the first valve core 310 remains in close contact with the sealing surface of the valve seat 200 under the drive of the first elastic reset member 320, completely sealing the first flow channel. This not only significantly simplifies the internal flow channel design, but also solves the problems of inconsistent bidirectional opening characteristics, instantaneous crossflow, and abnormal wear of the sealing surface caused by pressure imbalance in the existing technology through the independent adjustability of the preload of the dual elastic elements. Especially under high pressure differential conditions, it can avoid the linkage interference caused by the simultaneous pressure of the one-way valve core and the safety valve core in the existing technology, and greatly improve the accuracy of bidirectional control, sealing reliability, and long-term stability.

[0024] In some possible implementations, the first valve core 310 has a groove 3111 at one end near the valve seat 200, and the edge of the groove 3111 is provided with a second sealing surface 3112, and the second valve core 330 cooperates with the second sealing surface 3112.

[0025] Specifically, the first valve core 310 has a groove 3111 at one end near the valve seat 200, the edge of which forms a second sealing surface 3112, which, together with the second valve core 330 inserted therein, forms a mating sealing pair. When reverse fluid pressure is applied, the second valve core 330, driven by the fluid, overcomes the second elastic reset member 340 and moves away from the first valve core 310, disengaging from the second sealing surface 3112 and thus opening the second flow channel, achieving reverse conduction. In the forward flow or pressureless state, the second elastic reset member 340 drives the second valve core 330 to tightly fit against the second sealing surface 3112, effectively sealing the second flow channel. In this way, the second sealing surface 3112 is integrated into the interior of the first valve core 310, which not only makes full use of the axial space of the valve core assembly and improves the structural compactness, but also makes the sealing stroke of the second valve core 330 short and the response rapid.

[0026] In some possible implementations, the second valve core 330 includes: Rod 331 is inserted into the first valve core 310; The plug 332 is fixedly installed on the rod body 331. When the second valve core 330 is closed, the plug 332 is embedded in the groove 3111 and abuts against the second sealing surface 3112.

[0027] In some possible implementations, the second flow channel is a through hole 3114 opened on the first valve core 310, or a gap formed by the opposing surfaces of the first valve core 310 and the second valve core 330.

[0028] Specifically, under the action of the second elastic reset member 340, the plug 332 can be precisely embedded in the groove 3111 at the end of the first valve core 310 and tightly fitted with the second sealing surface 3112, thereby reliably sealing the second flow channel. The second flow channel can be designed as a through hole 3114 opened on the first valve core 310, or formed by an annular gap between the inner wall of the first valve core 310 and the outer periphery of the second valve core 330. This structural design makes the opening and closing of the second flow channel depend only on the axial displacement of the plug 332 relative to the groove 3111: when the reverse fluid pressure overcomes the second elastic reset member 340, the plug 332 disengages from the second sealing surface 3112, and the fluid flows through the through hole 3114 or the gap; otherwise, it is quickly sealed. Since the plug 332 and the groove 3111 form a clear opening and closing mating pair, the sealing contact area is controllable and the centering is good, which effectively improves the sealing stability and pressure resistance. At the same time, the through hole 3114 or the intermittent flow channel structure is easy to process and has low flow resistance, taking into account both high response speed and low flow resistance characteristics, further enhancing the dynamic sealing performance and control consistency of the two-way valve under high frequency switching and high pressure differential conditions.

[0029] In some possible implementations, there are multiple through holes 3114, which are evenly distributed circumferentially around the axis of the first valve core 310.

[0030] Specifically, the first valve core 310 has multiple through holes 3114 as second flow channels, and these through holes 3114 are evenly distributed circumferentially around the axis of the first valve core 310. This arrangement allows the fluid to flow symmetrically in the circumferential direction when the valve is opened in the reverse direction, effectively balancing the fluid pressure acting on the second valve core 330 (especially the plug 332), and avoiding valve core tilting, jamming, or local wear of the sealing surface caused by eccentric flow. At the same time, the porous structure increases the total flow area of ​​the second flow channel without significantly increasing the outer diameter of the valve core, reducing flow resistance and improving reverse flow efficiency. The number and size of the through holes 3114 are not specifically limited and can be determined as needed.

[0031] In some possible implementations, the rod 331 has a reduced diameter structure, and the surface of the reduced diameter structure forms an annular gap with the inner wall of the second valve core 330.

[0032] Specifically, the annular gap constitutes part or all of the second flow channel. When the second valve core 330 is in the open state, the reverse fluid can flow smoothly along this annular gap. The continuity and symmetry of the annular channel achieve uniform flow, effectively reducing the risk of turbulence or cavitation caused by excessively high local flow velocities. At the same time, the design of the reduced diameter structure reduces the fitting length between the rod 331 and the first valve core 310 while ensuring the necessary flow cross-sectional area, reducing the frictional resistance and making the second valve core 330 more responsive and smoother in action. In addition, the size of the annular gap can be precisely controlled through precision machining, ensuring good flow performance and forming a double sealing guarantee with the plug 332 and the second sealing surface 3112 when closed. That is, the main seal is achieved by the plug 332 and the groove 3111, and the auxiliary seal is provided by the closed state of the annular gap, further improving the sealing reliability and anti-leakage capability of the bidirectional valve under high pressure differential conditions.

[0033] In some possible implementations, the rod 331 is screwed to a limit block 350, and the second elastic reset member 340 is sleeved on the rod 331 with one end abutting against the first valve core 310 and the other end abutting against the limit block 350.

[0034] Specifically, the initial compression of the second elastic reset element 340 can be precisely adjusted via the threaded connection of the limiting block 350, thereby flexibly setting the reverse opening pressure and achieving independent matching and optimization of forward and reverse opening characteristics. Simultaneously, the limiting block 350 not only provides reliable axial support for the second elastic reset element 340 but also effectively limits the maximum displacement stroke of the second valve core 330, preventing it from excessively disengaging from the sealing position under high-pressure impact, leading to loss of control or impact damage. Furthermore, the threaded connection facilitates assembly and subsequent maintenance, allowing adjustment of the elastic preload or replacement of the reset element without disassembling the entire valve core assembly. This significantly improves the adjustability, reliability, and service life of the bidirectional valve, making it particularly suitable for fluid control systems requiring frequent switching or exhibiting variable operating parameters.

[0035] In some possible implementations, the valve seat 200 is screwed into the housing 100.

[0036] Specifically, the valve seat 200 and the housing 100 are screwed together. By controlling the screwing depth to finely adjust the axial position of the valve seat 200, the initial compression of the first elastic reset member 320 can be adjusted, thereby finely adjusting the initial sealing preload or opening stroke of the first valve core 310. This provides a structural basis for the balanced matching of the forward and reverse performance of the bidirectional valve, further enhancing the product's adaptability and engineering practicality.

[0037] In some possible implementations, the valve seat 200 is nested with a sealing ring 230, which is interference-fitted with the housing 100.

[0038] Specifically, the sealing ring 230 enables the creation of a reliable static seal between the valve seat 200 and the housing 100, effectively blocking potential leakage paths of fluid along the gap between the outer periphery of the valve seat 200 and the housing 100, especially under high pressure or corrosive media conditions, significantly improving the overall sealing integrity of the valve body.

[0039] In some possible implementations, the first sealing surface 220 and the second sealing surface 3112 are conical surfaces.

[0040] Specifically, both the first sealing surface 220 and the second sealing surface 3112 adopt a conical surface structure, so that the first valve core 310 and the valve seat 200, and the plug 332 of the second valve core 330 and the groove 3111 of the first valve core 310, respectively form line contact or narrow annular contact seals. The conical sealing surface has self-aligning characteristics, which can guide it to accurately fit the sealing position during the valve core reset process, effectively compensating for minor eccentricities in manufacturing or assembly and improving sealing reliability; at the same time, the conical surface structure will generate a self-tightening effect under fluid pressure, that is, the higher the medium pressure, the greater the clamping force between the sealing pairs, thereby significantly enhancing the sealing performance under high pressure conditions and suppressing leakage.

[0041] In some possible implementations, the first elastic reset member 320 and the second elastic reset member 340 are helical springs.

[0042] Specifically, the helical spring has good fatigue life and impact resistance, and can maintain stable mechanical properties under high-frequency switching or vibration conditions. Combined with the coaxial nesting layout of the valve core, it effectively avoids the problem of uneven load or jamming of the reset force.

[0043] In some possible implementations, the first valve core 310 includes: The core 311 has a guide hole 3113 for inserting the second valve core 330 and a plurality of through holes 3114 surrounding the guide hole 3113 to form a second flow channel; Multiple guide blocks 312 are distributed on the outer periphery of the core 311 and slide in cooperation with the inner wall of the shell 100. The gaps between adjacent guide blocks 312 form a flow channel structure.

[0044] Specifically, the core 311 has a guide hole 3113 inside for guiding the axial movement of the second valve core 330, and multiple through holes 3114 are arranged around it as a second flow channel; while multiple guide blocks 312 are evenly arranged along the outer periphery of the core 311, forming a sliding fit with the inner wall of the housing 100, which provides stable radial support and precise guidance for the first valve core 310, preventing it from deflecting or jamming during opening and closing, and forming a flow channel structure (i.e., part of the first flow channel) around the valve core through the gap between adjacent guide blocks 312. This design integrates the guiding function and the flow function into one, which effectively expands the flow cross-sectional area of ​​the positive fluid while ensuring the smooth movement of the valve core, reducing flow resistance and improving flow uniformity. In addition, the discrete layout of the guide blocks 312 avoids the high frictional resistance caused by traditional full-circumference contact, making the valve core response more sensitive, especially suitable for high pressure differential and high frequency switching conditions.

[0045] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0046] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A two-way valve, characterized in that, include: Casing (100); A valve seat (200) is disposed within the housing (100) and has a flow channel hole (210) and a first sealing surface (220). A valve core assembly is disposed within the housing (100) and located on the side close to the sealing surface. The valve core assembly has a flow channel structure, which together with the flow channel hole (210) forms a first flow channel. The valve core assembly includes a first valve core (310) slidably disposed within the housing (100), a first elastic reset member (320) for driving the first valve core (310) to abut against the sealing surface and close the first flow channel, a second valve core (330) inserted into the first valve core (310), and a second elastic reset member (340) for driving the second valve core (330) to abut against the first valve core (310). The valve core assembly defines a second flow channel, which is configured to close when the first valve core (310) and the second valve core (330) abut against each other. The direction of the force exerted by the first elastic reset member (320) on the first valve core (310) is opposite to the direction of the force exerted by the second elastic reset member (340) on the second valve core (330), and the opening directions of the first valve core (310) and the second valve core (330) correspond to opposite fluid flow directions.

2. The bidirectional valve according to claim 1, characterized in that, The first valve core (310) has a groove (3111) at one end near the valve seat (200), and the edge of the groove (3111) is provided with a second sealing surface (3112), and the second valve core (330) cooperates with the second sealing surface (3112).

3. The bidirectional valve according to claim 2, characterized in that, The second valve core (330) includes: The rod (331) is inserted into the first valve core (310). The plug (332) is fixedly installed on the rod body (331). When the second valve core (330) is closed, the plug (332) is embedded in the groove (3111) and abuts against the second sealing surface (3112).

4. The bidirectional valve according to claim 3, characterized in that, The second flow channel is a through hole (3114) opened on the first valve core (310), or a gap formed by the opposing surfaces of the first valve core (310) and the second valve core (330).

5. The bidirectional valve according to claim 4, characterized in that, The number of through holes (3114) is multiple, and they are evenly distributed circumferentially around the axis of the first valve core (310); Alternatively, the rod (331) has a reduced diameter structure, and the surface of the reduced diameter structure forms an annular gap with the inner wall of the second valve core (330).

6. The bidirectional valve according to claim 5, characterized in that, The rod (331) is screwed to a limiting block (350), and the second elastic reset member (340) is sleeved on the rod (331) with one end abutting against the first valve core (310) and the other end abutting against the limiting block (350).

7. The bidirectional valve according to any one of claims 2 to 6, characterized in that, The valve seat (200) is screwed into the housing (100); And / or, the first sealing surface (220) and the second sealing surface (3112) are conical surfaces.

8. The bidirectional valve according to claim 7, characterized in that, The valve seat (200) is nested with a sealing ring (230), which is interference-fitted with the housing (100).

9. The bidirectional valve according to any one of claims 1 to 6, characterized in that, The first elastic reset member (320) and the second elastic reset member (340) are helical springs.

10. The bidirectional valve according to any one of claims 1 to 6, characterized in that, The first valve core (310) includes: The core (311) has a guide hole (3113) for inserting the second valve core (330) and a plurality of through holes (3114) surrounding the guide hole (3113) to form a second flow channel. Multiple guide blocks (312) are distributed on the outer periphery of the core (311) and slide in cooperation with the inner wall of the shell (100). The gaps between adjacent guide blocks (312) form a flow channel structure.

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