Bidirectional flow resistance regulating valve

Abstract

The present invention relates to the technical field of fluid pipeline systems, and discloses a bidirectional flow resistance regulating valve, comprising a shell and a core, wherein the shell has a flow channel, and has a first position and a second position in the flow direction of the flow channel, the flow channel cross section at the first position being smaller than the flow channel cross section at the second position, the core being located in the flow channel of the shell, a gap being formed between the outer edge of the core and the inner wall of the flow channel for bidirectional flow of fluid, the core being able to move in the same direction as the fluid flow between the first position and the second position, the area of ​​the gap being smaller in the first position than in the second position. The bidirectional flow resistance regulating valve has the function of allowing water to flow in two directions and regulating flow and pressure mainly in one direction. Compared with traditional flow and pressure regulating valves, it can automatically adjust and control the opening according to the different directions of water flow, thereby controlling the flow rate and flow rate of water flow in different directions, does not require the installation of a drive device, and has a fast response speed.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid pipeline systems, and more particularly to a bidirectional flow resistance regulating valve. Background Art

[0002] Typically, in fluid piping systems, such as water pipes, sudden pump stops or valve closures can cause a transient state of rapid changes in flow and pressure, a phenomenon known as water hammer. When water hammer occurs, the sudden change in flow within the pipe causes a pressure wave to propagate, causing a rapid increase or decrease in pressure within the pipe. This shock wave can cause the pipe to collapse or be damaged.

[0003] To prevent losses caused by water hammer, existing technologies incorporate protective devices such as water hammer suppression tanks into pumped water pipeline systems to replenish water or absorb excess pressure in the pipeline, thereby mitigating water hammer caused by changes in fluid flow. The principle is that when negative pressure develops behind the pump, the water accumulated in the tank is rapidly injected into the pipeline under the pressure of compressed gas, preventing negative pressure and pipeline collapse. When positive pressure develops in the pipeline, the water in the pipeline is injected into the water hammer suppression tank, thereby absorbing the positive pressure.

[0004] The water hammer suppression tank needs to be fast in responding to negative pressure to replenish water in the pipeline to prevent delays. However, when the water hammer suppression tank absorbs the positive pressure wave in the pipeline, the high transient positive pressure wave is likely to cause impact damage to the water hammer suppression tank. Therefore, if Figure 1 As shown, in the prior art, separate outflow and inflow pipes are typically designed for water hammer arrester tank a. Water hammer arrester tank a is connected to the water supply pipe c via a connecting pipe b. Connecting pipe b branches into an inlet pipe d and an outlet pipe e of different diameters. Outlet pipe e has a larger diameter and controls the outflow flow from water hammer arrester a, while inlet pipe d has a smaller diameter and controls the inflow flow into water hammer arrester a. However, the installation of separate control valves on each pipe results in a complex piping structure and increased equipment and maintenance costs. Furthermore, malfunctioning of the valve openings can lead to an inability to effectively prevent water hammer.

[0005] Therefore, in special scenarios such as water hammer elimination tank systems, if one wants to optimize and simplify pipeline design, traditional functional valves cannot meet the requirements. For example, traditional check valves can only allow water to flow in one direction, and the water hammer elimination tank cannot effectively prevent positive and negative pressure water hammer. Traditional flow and pressure regulating valves are usually also used in one-way flow pipelines, and the flow regulating valve requires active adjustment by the driving device, and cannot automatically and quickly respond to different water flow pressures in two directions in the water hammer elimination tank system. Therefore, it is now necessary to design a special valve or device to solve the above problems. Summary of the Invention

[0006] The present invention provides a bidirectional flow resistance regulating valve, which solves the problem that existing valves cannot allow water to flow in both directions and mainly play the role of regulating flow and pressure in only one direction.

[0007] In order to achieve the above object, the technical solution provided by the present invention is:

[0008] Bidirectional flow resistance regulating valve, including:

[0009] The housing has a flow channel, one end of the flow channel is provided with a first opening, the other end of the flow channel is provided with a second opening, and the flow channel has a first position and a second position in the flow direction of the flow channel, and the flow channel cross section at the first position is smaller than the flow channel cross section at the second position;

[0010] The core is located in the flow channel of the shell, and a gap is formed between the outer edge of the core and the inner wall of the flow channel for bidirectional flow of fluid. The core can move in the same direction as the fluid flow direction between a first position and a second position, and the area of ​​the gap is smaller in the first position than in the second position.

[0011] During operation, when the fluid flows from the first opening to the second opening, the core moves from the first position to the second position. At this time, the gap is the largest, the area for fluid circulation is the largest, and the resistance to the fluid is the smallest; when the fluid flows from the second opening to the first opening, the core moves from the second position to the first position. At this time, the gap is the smallest, and the area for fluid circulation is the smallest, thereby playing a role in regulating flow and pressure, and can save flow and dissipate energy.

[0012] As a further improvement to the bidirectional flow resistance regulating valve, the cross-section of the flow passage in the housing gradually increases from the first position to the second position. This gradual increase in the cross-sectional area of ​​the flow passage prevents sudden changes in flow resistance when the fluid passes through the gap, allowing the fluid to flow more smoothly and fluidly through the gap, reducing vibration and preventing water hammer.

[0013] As a further improvement of the bidirectional flow resistance regulating valve, the bidirectional flow resistance regulating valve further includes a core shaft, the flow channel wall of the shell is fixedly connected to a bracket, the core shaft is movably mounted on the bracket, and the core body is mounted on the core shaft.

[0014] Furthermore, the core body is connected to the core shaft via an adjustment structure, which is used to adjust the position of the core body in the axial direction of the core shaft, and the cross section of the flow channel of the shell gradually increases from the first position to the second position.

[0015] Furthermore, the adjustment structure includes a locking nut, a threaded hole provided on the core body and an external thread provided on the core shaft. The core body is screwed together with the external thread of the core shaft through the threaded hole, and the locking nut is threadedly connected to the core shaft to lock the core body.

[0016] Through the above further improvement scheme, the position of the core body in the axial direction of the core shaft can be adjusted, and when the position is adjusted, since the cross-section of the flow channel of the shell gradually increases from the first position to the second position, the gap area is smaller when the core body is adjusted toward the first position, and the gap area is larger when the core body is adjusted toward the second position, thereby controlling the flow and pressure regulation performance of the bidirectional flow resistance regulating valve.

[0017] Furthermore, a first limiting portion and a second limiting portion are provided on the core shaft. The first limiting portion is used to abut against the bracket for limiting when the core moves to the first position, and the second limiting portion is used to abut against the bracket for limiting when the core moves to the second position.

[0018] Furthermore, the first limiting portion is a limiting end cover connected to one end of the core shaft; and the second limiting portion is a shoulder provided on the circumferential surface of the core shaft.

[0019] Furthermore, an elastic member is sleeved on the core shaft and can exert an elastic force on the core body in a direction from the second position toward the first position.

[0020] Furthermore, a guide sleeve is provided on the bracket, and the core shaft and the guide sleeve are movably matched.

[0021] As a further improvement of the bidirectional flow resistance regulating valve, the side of the core body facing the first position is a plane perpendicular to the flow direction of the flow channel, and the side of the core body facing the second position is an arc surface arched from the edge to the middle.

[0022] Furthermore, the cross section of the flow channel of the shell gradually decreases from the second position to the second opening.

[0023] Through the shape design of the flow channel of the core and the shell, when the fluid flows from the first opening to the second opening, since the side of the core facing the first position is a vertical plane, the fluid can more easily push the core away, so that the core follows the fluid to move toward the second opening; when the fluid flows from the second opening to the first opening, since the side of the core facing the second position is an arc surface arched from the edge to the middle, the flow resistance is smaller when the fluid passes through the surface of the core, it is not easy to vibrate and impact, and it does not affect the throttling and energy dissipation effect of the gap.

[0024] Furthermore, flanges are provided on the shell walls at both ends of the flow channel.

[0025] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0026] (1) The bidirectional flow resistance regulating valve of the present invention has the function of allowing water to flow in two directions and regulating the flow and pressure mainly in one direction. Compared with the traditional flow regulating and pressure regulating valve, it can automatically adjust and control the opening according to the different directions of water flow, thereby controlling the flow rate and flow rate of water flow in different directions. It does not require the installation of a driving device and has a fast response speed.

[0027] (2) When the bidirectional flow resistance regulating valve of the present invention is applied to a pipeline water hammer protection system, it can pass water in both directions and automatically adjust the opening to allow water to flow out and in at a necessary speed, thereby effectively preventing the occurrence of water hammer. It can also play a protective role for the water hammer elimination tank. It only needs to be connected to the water supply pipeline through a single inlet and outlet pipe. The structure of the pipeline is simple, so it is easy to install, maintain and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of a water hammer elimination protection system in the prior art;

[0029] Figure 2 is a cross-sectional view of a bidirectional flow resistance regulating valve according to an embodiment of the present invention;

[0030] Figure 3 is a cross-sectional view of a bidirectional flow resistance regulating valve according to an embodiment of the present invention;

[0031] Figure 4 This is a structural diagram of a bidirectional flow resistance regulating valve according to an embodiment of the present invention applied to a water hammer elimination tank system during water discharge;

[0032] Figure 5 This is a structural schematic diagram of a bidirectional flow resistance regulating valve according to an embodiment of the present invention applied to a water hammer elimination tank system during water inflow.

[0033] Description of labels:

[0034] 1-Two-way flow resistance regulating valve;

[0035] 11-housing, 111-flow channel, 112-first opening, 113-second opening, x-first position, y-second position;

[0036] 12-core, 121-threaded hole;

[0037] 13-core shaft, 131-locking nut, 132-external thread, 133-limiting end cover, 134-shaft shoulder;

[0038] 14- bracket, 141- guide sleeve;

[0039] 15-pressure spring;

[0040] 2-Inner liner water hammer elimination tank;

[0041] 3-Inlet and outlet water pipes. DETAILED DESCRIPTION

[0042] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0043] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification, so that people familiar with this technology can understand and read them. They are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content. In addition, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0044] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, for the purposes of describing the embodiments of the present application herein.

[0045] Reference Figure 2-3 As shown, this embodiment provides a two-way flow resistance regulating valve 1, including a housing 11 and a core 12, wherein the core 12 is installed in the housing 11 via a core shaft 13. A flow channel 111 is provided in the housing 11, wherein a first opening 112 is provided at one end of the flow channel 111, and a second opening 113 is provided at the other end of the flow channel 111. The flow channel 111 has a first position x and a second position y in the flow direction, wherein the cross section of the flow channel 111 at the first position x is smaller than the cross section of the flow channel 111 at the second position y. In this embodiment, the first position x is set closer to the first opening 112, and the second position y is set closer to the second opening 113. In other embodiments, the first position x can also be set closer to the second opening 113, and the second position y can be set closer to the first opening 112.

[0046] The core 12 is located in the flow channel 111 of the shell 11. A gap is formed between the outer edge of the core 12 and the inner wall of the flow channel 111 to allow bidirectional flow of fluid. The core 12 can move in the same direction as the fluid flow between a first position x and a second position y. A preferred solution of this embodiment is that the wall of the flow channel 111 of the shell 11 is fixedly connected to a bracket 14, the core shaft 13 is movably mounted on the bracket 14, and the core 12 is mounted on the core shaft 13. In some embodiments, the core 12 can also be set in the shell 11 using other mounting and connection structures or methods. For example, the core 12 can be movably assembled with the inner wall of the flow channel of the shell 11. As long as the core 12 is installed inside the shell 11, a gap is formed between the core 12 and the inner wall of the flow channel 111 to allow bidirectional flow of fluid, and the core 12 can move in the same direction as the fluid flow between the first position x and the second position y. The area of ​​the gap at the first position x is smaller than that at the second position y. In practice, the area of ​​the gap between the first position x and the second position y can be calculated by calculating the difference between the cross-sectional area of ​​the flow channel 111 of the shell 11 and the cross-sectional area of ​​the core 12 .

[0047] The following will be Figure 2 and Figure 3 As shown, the working principle of the two-way flow resistance regulating valve 1 is described:

[0048] During operation, when the fluid flows from the first opening 112 to the second opening 113, due to the thrust of the fluid, the core 12 moves from the first position x to the second position y. At this time, the gap between the outer edge of the core 12 and the flow channel 111 is the largest, the area for fluid circulation is the largest, the resistance to the fluid is the smallest, and the fluid can pass through quickly. The gap area at the second position y can be set to be no less than the full diameter area of ​​the flow channel 111, thereby minimizing the flow resistance to the fluid as much as possible. When the fluid flows from the second opening 113 to the first opening 112, under the thrust of the fluid, the core 12 moves from the second position y to the first position x. At this time, the gap is the smallest, the area for fluid circulation is the smallest, and the fluid can only pass through in a throttling manner, thereby regulating flow and pressure, and being able to throttle and dissipate energy.

[0049] In the bidirectional flow resistance regulating valve 1 of this embodiment, the cross-section of the flow passage 111 of the housing 11 gradually increases from the first position x to the second position y. It is worth noting that the gradual increase in cross-sectional area can be linear or nonlinear, with linear variation being the preferred option. This arrangement allows the flow resistance of the fluid to gradually change as it passes through the gap, allowing the fluid to flow more smoothly and fluidically through the gap, reducing vibration and preventing water hammer.

[0050] In order to adjust the gap area of ​​the core 12 when it is in the first position x, and thus flexibly adjust the flow resistance of the fluid when it flows from the second opening 113 to the first opening 112 to meet different pressure regulation requirements, this embodiment also provides a further improvement scheme. Specifically, the cross section of the flow channel 111 of the shell 11 gradually increases from the first position x to the second position y. In addition, the core 12 is connected to the core shaft 13 through an adjustment structure, and the adjustment structure is used to adjust the position of the core 12 in the axial direction of the core shaft 13. Figure 2 、 3 As shown, the adjustment structure specifically includes a locking nut 131, a threaded hole 121 provided on the core body 12, and an external thread 132 provided on the core shaft 13. The core body 12 is screwed together with the external thread 132 of the core shaft 13 through the threaded hole 121, and the locking nut 131 is threadedly connected to the core shaft 13 to lock the core body 12. When the locking nut 131 is loosened, the core body 12 can be screwed to adjust the position of the core body 12 on the core shaft 13. After the position is adjusted, the locking nut 131 can be tightened to complete the adjustment. This example is a preferred embodiment of the adjustment structure. In some other embodiments, the adjustment structure can also be other structures that can achieve the same function that can be conceived by those skilled in the art without inventive effort.

[0051] Through the above further improvement scheme, when the axial position of the core body 12 on the core shaft 13 is adjusted, the size of the gap area between the outer edge of the core body 12 and the inner wall of the flow channel 111 also changes. When the core body 12 is adjusted toward the first position x, the gap area is smaller, and when the core body 12 is adjusted toward the second position y, the gap area is larger, thereby changing the flow and pressure regulation performance of the core body 12 at the first position x.

[0052] In order to better limit the movement of the core 12 between the first position x and the second position y, in this embodiment, the core shaft 13 is provided with a first limiting portion and a second limiting portion. The first limiting portion is used to limit the core 12 against the bracket 14 when it moves to the first position x, and the second limiting portion is used to limit the core 12 against the bracket 14 when it moves to the second position y. Specifically, Figure 2 、 3 As shown, the first limiter is a limiter end cap 133 detachably connected to one end of the core shaft 13 via a screw; the second limiter is a shoulder 134 provided on the circumferential surface of the core shaft 13. In some other embodiments, the first limiter and the second limiter may also be other structures capable of limiting the travel of the core shaft 13.

[0053] As a preferred embodiment of this embodiment, the core shaft 13 is equipped with an elastic member capable of exerting an elastic force on the core body 12 in the direction from the second position y toward the first position x. The elastic member is configured to push the core body 12 to the first position x when the core body 12 is not subjected to fluid thrust. This elastic member primarily assists in resetting the core body 12 through the elastic force. The elastic force only needs to be sufficient to avoid increasing the flow resistance of the fluid from the first opening 112 to the second opening 113. Specifically, the elastic member can be a pressure spring 15, which is located between the side of the core body 12 facing the second opening 113 and the bracket 14. In other embodiments, the elastic member can also be a tension spring, or other structures commonly used by those skilled in the art.

[0054] Furthermore, a guide sleeve 141 is provided on the bracket 14 , and the core shaft 13 and the guide sleeve 141 are movably matched. The guide sleeve 141 can reduce the friction of the core shaft 13 and make the core body 12 move more flexibly.

[0055] As a preferred solution of this embodiment, the side of the core 12 facing the first position x is a plane perpendicular to the flow direction of the flow channel 111, and the side of the core 12 facing the second position y is an arc surface arched from the edge to the middle, and the cross-section of the flow channel 111 of the shell 11 gradually decreases from the second position y to the second opening 113.

[0056] Through the shape design of the flow channel 111 of the core 12 and the shell 11, when the fluid flows from the first opening 112 to the second opening 113, since the side of the core 12 facing the first position x is a vertical plane, the fluid can more easily push the core 12 away, so that the core 12 follows the fluid to move toward the second opening 113; when the fluid flows from the second opening 113 to the first opening 112, since the side of the core 12 facing the second position y is a smooth arc surface arched from the edge to the middle, the flow resistance is smaller when the fluid passes through the surface of the core 12, it is not easy to vibrate and impact, and it does not affect the throttling and energy dissipation effect of the gap.

[0057] In this embodiment, flanges 114 are provided on the walls of the housing 11 at both ends of the flow channel 111 , and the two-way flow resistance regulating valve 1 is conveniently connected to the pipeline through the flanges 114 .

[0058] The bidirectional flow resistance regulating valve 1 can be applied to some scenarios where it is necessary to allow bidirectional flow of fluid and mainly regulate the fluid pressure in only one direction. Figure 4 and 5As shown, when the bidirectional flow resistance regulating valve 1 is used in a water hammer suppression tank system, the inner-tank water hammer suppression tank 2 and the water supply pipeline only need to be connected via a single inlet and outlet water pipe 3, to which the bidirectional flow resistance regulating valve 1 is connected. Specifically, the first opening 112 of the bidirectional flow resistance regulating valve 1 is connected to the end near the inner-tank water hammer suppression tank 2, and the second opening 113 is connected to the end near the water supply pipeline.

[0059] When the water hammer elimination tank system is working, when negative pressure appears in the water pipeline, the inner tank type water hammer elimination tank 2 will replenish water into the water pipeline. Figure 4 As shown, the arrow indicates the direction of water flow. When water in the inner liner type water hammer elimination tank 2 flows out, the thrust of the water will push the core 12 toward the second opening 113. At this time, the gap between the core 12 and the inner wall of the flow channel 111 is the largest, and the resistance of water passing through the flow channel 111 is small, so that the inner liner type water hammer elimination tank 2 can quickly replenish water to the water pipeline, thereby eliminating negative pressure. When positive pressure appears in the water pipeline, as shown in FIG. Figure 5 As shown, when the water in the water supply pipeline flows into the inner liner type water hammer elimination tank 2 through the inlet and outlet water pipes 3, the thrust of the water will push the core 12 to move toward the first opening 112. At this time, the gap between the core 12 and the inner wall of the flow channel 111 becomes very small, so that the flow resistance of water through the two-way flow resistance regulating valve 1 becomes larger, and the water flow can only pass through in a throttling manner, thereby reducing the pressure of the water flow and reducing the impact of the positive pressure water flow on the inner liner type water hammer elimination tank 2, which can prevent the inner liner from being broken or damaged due to a sudden increase in pressure.

[0060] The bidirectional flow resistance regulating valve 1 is used in a water hammer suppression tank system. When positive pressure occurs in the pipeline and water enters the inner-liner water hammer suppression tank 2, if the gap area of ​​the core 12 at the first position x is large, the resistance to water flow is small, and the energy dissipation effect on the water flow is poor. However, if the gap area at the first position x is small, the flow resistance is large, which may cause water hammer and vibration, making it difficult to provide protection against positive pressure water hammer. Therefore, in order to ensure that water flows through the bidirectional flow resistance regulating valve 1 at an appropriate flow rate, thereby preventing vibration or water hammer caused by excessive flow resistance and effectively dissipating energy to protect the inner-liner water hammer suppression tank 2, the gap area of ​​the core 12 at the first position x needs to be determined through hydraulic analysis and calculation due to different operating conditions. In this embodiment, only a preferred implementation range is provided: the gap area of ​​the core 12 at the first position x accounts for 1 / 10 to 1 / 2 of the nominal diameter area of ​​the flow channel 111.

[0061] In summary, when the two-way flow resistance regulating valve 1 is applied to the water hammer elimination tank system, since it can pass water in both directions and automatically adjust the opening so that water flows out and in at the necessary speed, it not only effectively prevents the occurrence of water hammer, but also plays a protective role for the water hammer elimination tank. It only needs to be connected to the water supply pipeline through a single inlet and outlet water pipe 3, the pipeline structure is simple, and installation, maintenance and repair are also easier.

[0062] The terms "installed," "disposed," "equipped with," and "connected" as used herein should be interpreted broadly. For example, they may refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0063] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. Bidirectional flow resistance regulating valve, characterized by: include: A housing (11) has a flow channel (111), one end of the flow channel (111) is provided with a first opening (112), the other end of the flow channel (111) is provided with a second opening (113), and the flow channel (111) has a first position (x) and a second position (y) in the flow direction, wherein the cross section of the flow channel (111) at the first position (x) is smaller than the cross section of the flow channel (111) at the second position (y), and a bracket (14) is provided on the housing (11); The core (12) is located in the flow channel (111) of the housing (11), and a gap is formed between the outer edge of the core (12) and the inner wall of the flow channel (111) to allow bidirectional flow of fluid. The core (12) can move in the same direction as the fluid flow between a first position (x) and a second position (y), and the area of ​​the gap at the first position (x) is smaller than that at the second position (y); A core shaft (13), wherein the core shaft (13) is arranged on the bracket (14); An adjustment structure comprises a locking nut (131), wherein the locking nut (131) is movably arranged on the core shaft (13) to adjust the position of the core body (12) on the core shaft (13).

2. The bidirectional flow resistance regulating valve according to claim 1, characterized in that: The cross section of the flow channel (111) of the shell (11) gradually increases from the first position (x) to the second position (y).

3. The bidirectional flow resistance regulating valve according to claim 1, characterized in that: The wall of the flow channel (111) of the shell (11) is fixedly connected to the bracket (14), the core shaft (13) is movably mounted on the bracket (14), and the core body (12) is mounted on the core shaft (13).

4. The bidirectional flow resistance regulating valve according to claim 3, characterized in that: The adjustment structure further comprises a threaded hole (121) provided on the core body (12) and an external thread (132) provided on the core shaft (13); the core body (12) is screwed together with the external thread (132) of the core shaft (13) through the threaded hole (121); and a locking nut (131) is threadedly connected to the core shaft (13) to lock the core body (12).

5. The bidirectional flow resistance regulating valve according to claim 3, characterized in that: A first limiting portion and a second limiting portion are provided on the core shaft (13), the first limiting portion being used to abut against the bracket (14) for limiting position when the core body (12) moves to the first position (x), and the second limiting portion being used to abut against the bracket (14) for limiting position when the core body (12) moves to the second position (y).

6. The bidirectional flow resistance regulating valve according to claim 5, characterized in that: The first limiting portion is a limiting end cover (133) connected to one end of the core shaft (13); the second limiting portion is a shaft shoulder (134) provided on the circumferential surface of the core shaft (13).

7. The bidirectional flow resistance regulating valve according to claim 3, characterized in that: An elastic member is mounted on the core shaft (13) and is capable of exerting an elastic force on the core body (12) in a direction from the second position (y) toward the first position (x); And / or, a guide sleeve (141) is provided on the bracket (14), and the core shaft (13) is movably matched with the guide sleeve (141).

8. The bidirectional flow resistance regulating valve according to any one of claims 1 to 7, characterized in that: The side of the core (12) facing the first position (x) is a plane perpendicular to the flow direction of the flow channel (111), and the side of the core (12) facing the second position (y) is an arc surface arched from the edge to the middle.

9. The bidirectional flow resistance regulating valve according to any one of claims 1 to 7, characterized in that: The cross section of the flow channel (111) of the housing (11) gradually decreases from the second position (y) to the second opening (113); And / or, flanges (114) are provided on the walls of the housing (11) at both ends of the flow channel (111).

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