Bidirectional self-adaptive throttle valve and refrigeration equipment

Abstract

The utility model provides a kind of bidirectional self-adapting throttle valve and refrigeration equipment, at least including valve body and slider, first valve seat, second valve seat, first valve needle and first valve needle spring, second valve needle and second valve needle spring, first positioning spring and first positioning block, second positioning spring and second positioning block being arranged in the valve body, the first valve seat is oppositely arranged in the valve body with second valve seat in the both sides of slider, and the slider can be axially slid in the space between the first valve seat and second valve seat.Under the action of fluid pressure, two sets of valve needle and valve needle spring, two sets of positioning spring, slider etc. According to pressure, automatically open and close corresponding valve port, and automatically adjust the opening of valve port according to the size of fluid pressure, realize bidirectional self-adapting throttling.The utility model can realize variable flow bidirectional throttling, under the restraint damping action of corresponding valve needle spring and positioning spring, corresponding valve needle oscillation is small, reliability is high, can make the control problem of throttling mechanism simple, automation.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, and to a throttling mechanism, specifically to an adaptive throttling valve and a refrigeration device with an adaptive throttling valve. Background Technology

[0002] In existing technologies, throttling devices between the evaporator and condenser of refrigeration equipment are generally adjustable flow elements and non-adjustable flow elements. Adjustable flow elements include electronic expansion valves, while non-adjustable flow elements include capillary tubes and throttling tubes (valves). Currently available adjustable flow elements are relatively expensive, especially electronic expansion valves, which require corresponding control strategies and are prone to jamming, resulting in low reliability. Non-adjustable flow elements can only provide a fixed length or fixed opening throttling effect and cannot adjust the throttling effect according to flow rate and pressure changes on both sides, exhibiting poor adaptability to throttling conditions. However, due to their lower cost, they are still widely used in refrigeration equipment. In air conditioning systems where throttling valves are used as throttling devices, the valve changes its throttling direction based on the switching between high and low system pressures. However, in actual use, the valve needle of the throttling valve may jam, affecting the normal operation of the air conditioner. Furthermore, the valve needle of the throttling valve is prone to vibration during axial movement, generating eddies when the refrigerant flows through the valve, resulting in mechanical and flow noise. If flow-adaptive throttling can be achieved in throttling pipes (valves), enabling adaptive throttling of variable flow rates, not only can material and manufacturing costs be saved, but also the cost of control strategies. Therefore, simplifying the control of throttling mechanisms, automating simple problems, adapting to bidirectional switching between cooling and heating, and achieving adaptive throttling under varying flow rates or pressures, reducing noise, lowering failure rates, facilitating maintenance and replacement, improving equipment reliability, and simultaneously meeting the needs of both cooling and heating are pursuits of industry engineers and researchers. Summary of the Invention

[0003] To overcome the defects and shortcomings of existing technologies, this utility model provides a bidirectional adaptive throttling valve and a bidirectional adaptive throttling refrigeration device. This effectively solves the problem that existing expansion valves cannot achieve adaptive throttling under varying flow rates or pressure differences, maintaining cooling or heating effects, reducing the risk of jamming and noise, improving the reliability of refrigeration equipment operation, and effectively and quickly meeting cooling and heating needs. Therefore, this utility model adopts the following technical solution:

[0004] Therefore, the first aspect of this utility model proposes a bidirectional adaptive throttling valve. The second aspect of this utility model proposes a bidirectional adaptive throttling refrigeration device.

[0005] According to one aspect of this utility model, it is achieved through the following technical solution:

[0006] A bidirectional adaptive throttle valve is provided, comprising at least a valve body and components disposed within the valve body, including a slider, a first valve seat, a second valve seat, a first valve needle and a first valve needle spring, a second valve needle and a second valve needle spring, a first positioning spring and a first positioning block, a second positioning spring and a second positioning block, etc.

[0007] The slider is disposed in the middle part of the valve body. The first positioning block, the first positioning spring, the first valve needle, the first valve needle spring, and the first valve seat are symmetrically disposed on both sides of the slider, along with the second valve seat, the second valve needle spring, the second valve needle, the second positioning spring, and the second positioning block. The first valve seat and the second valve seat are disposed opposite each other in the valve body on both sides of the slider. The slider can slide axially within the space between the first and second valve seats. The first valve needle and the second valve needle are respectively disposed opposite each other in the valve body behind the first and second valve seats, with the pointed ends of the first and second valve needles facing the valve holes of the first and second valve seats, respectively. The first valve needle spring is sleeved on the outside of the front end of the first valve needle. One end of the valve needle spring is disposed on the first valve seat, and the other end is disposed on the outer side of the front section of the first valve needle. The second valve needle spring is sleeved on the outer side of the front section of the second valve needle. One end of the second valve needle spring is disposed on the second valve seat, and the other end is disposed on the outer side of the front section of the second valve needle. The first positioning block is spaced apart and disposed within the valve body behind the first valve needle. The first positioning spring is disposed between the tail of the first valve needle and the front part of the first positioning block. One end of the first positioning spring is disposed at the tail of the first valve needle, and the other end is disposed on the first positioning block. The second positioning block is spaced apart and disposed within the valve body behind the second valve needle. The second positioning spring is disposed between the tail of the second valve needle and the front part of the second positioning block. One end of the second positioning spring is disposed at the tail of the second valve needle, and the other end is disposed on the second positioning block.

[0008] The slider is provided with an axial channel, which is a fluid channel.

[0009] The first positioning block is provided with a central channel or a fluid channel connecting the two ends of the first positioning block, which is a fluid channel.

[0010] The second positioning block is provided with a central channel or a fluid channel connecting the two ends of the second positioning block.

[0011] The two end faces of the slider respectively match the corresponding end faces of the first valve seat and the second valve seat.

[0012] The outer edge of the middle channel on both ends of the slider can be set as a conical protrusion or concave surface so that when the slider moves to the contact surface of the first valve seat or the second valve seat, it can be engaged and axially positioned without lateral displacement, thus eliminating or reducing noise generation. Of course, the two ends of the slider can also be set as planes.

[0013] The center of the end face of the first valve seat opposite to the slider can be set as a concave surface, a convex surface, or a plane.

[0014] The center of the end face of the second valve seat opposite to the slider can be set as a concave surface, a convex surface, or a plane.

[0015] The first valve seat has an axial throttling valve hole on its central shaft, and one or more fluid channels connecting the two end faces are provided on the outer side or end face of the first valve seat. One or more annular grooves may be provided on the outer side of the first valve seat, or no annular grooves may be provided.

[0016] The second valve seat has an axial throttling valve hole on its central shaft, and one or more fluid channels connecting the two end faces are provided on the outer side or end face of the second valve seat. One or more annular grooves may be provided on the outer side of the second valve seat, or no annular grooves may be provided.

[0017] A gap is left between the first valve needle, the second valve needle and the inner wall of the valve body, and the first valve needle and the second valve needle can move axially within the valve body.

[0018] The first valve needle may be provided with a fluid channel or a channel connecting the front and rear or inner and outer spaces of the first valve needle.

[0019] The second valve needle may be provided with a fluid channel or a channel connecting the front and rear or inner and outer spaces of the second valve needle.

[0020] The end face of the first valve seat or the second valve seat may be provided with a step. One or both end faces of the first valve seat or the second valve seat may be provided as a groove, a cylindrical opening, a recessed cavity, an annular groove, or a step, or of course, they may be provided as a plane.

[0021] An annular support or annular ring for the valve needle spring may be provided on the end face of the first valve seat or the second valve seat to facilitate limiting the displacement of the first valve needle spring or the second valve needle spring.

[0022] The first valve seat or the second valve seat can be a valve seat assembly of a combination body. The valve seat assembly includes at least a valve seat body and a valve hole core. The valve seat body has an axial through hole on its outer side or end face. The valve hole core is provided with a throttle valve hole. The valve seat body has a axial hole. The valve hole core is nested and fixed at the axial hole of the valve seat body.

[0023] The inlet and outlet of the valve hole channel at the center of the first or second valve seat can be set in a funnel shape or beveled to reduce the generation of flow eddies.

[0024] The first valve needle spring is sleeved on the outside of the front section of the first valve needle. One end of the first valve needle spring can be disposed on the outer wall, step, or annular groove of the first valve needle, and the other end can be disposed on the first valve seat. Both ends of the first valve needle spring can be fixed to the contacting surface, or one end can be fixed while the other end is not fixed, or neither end can be fixed.

[0025] The second valve needle spring is sleeved on the outside of the front section of the second valve needle. One end of the second valve needle spring can be located on the outer wall, step, or annular groove of the second valve needle, and the other end can be located on the second valve seat. Both ends of the second valve needle spring can be fixed to the contacting surface, or one end can be fixed while the other end is not fixed, or neither end can be fixed.

[0026] To ensure the first valve needle spring and its end face are flat, and to maintain the coaxiality of the first valve needle with the throttle valve orifice of the first valve seat, transition smoothing rings can be provided at one or both ends of the first valve needle spring. The purpose of the transition smoothing rings is to allow the first valve needle spring to be flatly mounted on the surface of the object it contacts, maintaining the coaxiality of the first valve needle installation.

[0027] To ensure the second valve needle spring and its end faces are flat and to maintain the coaxiality of the second valve needle with the throttle valve orifice of the second valve seat, transition smoothing rings can be provided at one or both ends of the second valve needle spring. The purpose of the transition smoothing rings is to allow the second valve needle spring to be flatly mounted on the surface of the object it contacts, maintaining the coaxiality of the second valve needle installation.

[0028] The first or second valve needle spring can be a flat-headed spring.

[0029] For simplicity, neither the first nor the second valve needle spring needs to have a transition smoothing ring at either end.

[0030] The outer surface of the first valve needle or the second valve needle may be composed of the same or different rotating surfaces.

[0031] One or more steps or annular grooves may be provided on the outer side of the first valve needle. One end of the first valve needle spring may be positioned or limited at the step or annular groove on the outer side of the first valve needle.

[0032] One or more steps or annular grooves may be provided on the outer side of the second valve needle. One end of the second valve needle spring may be positioned or limited at the step or annular groove on the outer side of the second valve needle.

[0033] An annular groove can be provided at the step of the first or second valve needle, and one end of the first or second valve needle spring can be embedded in the annular groove.

[0034] A fluid flow channel can be provided on or outside the first or second valve needle, or the flow channel can be omitted.

[0035] The tail or end of the first valve needle may be provided with a step, an annular groove, a recess, a cavity, a hole, or a thin rod to facilitate the installation of the first positioning spring.

[0036] The tail or end of the second valve needle may be provided with a step, annular groove, recess, cavity, hole, or thin rod to facilitate the installation of the second positioning spring.

[0037] In order to make the end face of the positioning spring flat and maintain the coaxiality of the valve needle, a transition smoothing ring can be set at one or both ends of the first positioning spring and the second positioning spring, so that the first positioning spring or the second positioning spring can be set flat on the surface of the object it contacts.

[0038] The first or second positioning spring can be a flat-headed spring.

[0039] For simplicity, neither the first nor the second positioning spring needs to have transition smoothing rings at either end.

[0040] The first positioning spring and the second positioning spring are respectively located at the rear of the first valve needle and the second valve needle. Both ends of the first positioning spring or the second positioning spring can be fixed on the contacting surface, or one end can be fixed while the other end is not fixed, or neither end can be fixed.

[0041] The tail end or tail portion of the first valve needle may be provided with a cavity, and a step may be provided inside the cavity, and one end of the first positioning spring may be inserted into the cavity.

[0042] The tail end or tail portion of the second valve needle may be provided with a cavity, and a step may be provided inside the cavity, and one end of the second positioning spring may be inserted into the cavity.

[0043] The first valve needle, the first valve needle spring, the first positioning spring, and the first positioning block can form a first positioning valve needle assembly.

[0044] The second valve needle, the second valve needle spring, the second positioning spring, and the second positioning block can form a second positioning valve needle assembly.

[0045] The first positioning block and the second positioning block are disposed on the inner wall of the valve body.

[0046] The first positioning block has one or more axial fluid channels on its shaft center, end face or outer side, or the first positioning block has fluid channels connecting the two ends of the first positioning block; the outer side of the first positioning block may have one or more annular grooves to facilitate roll pressing and fixing.

[0047] The annular groove may not be provided on the outer side of the first positioning block.

[0048] The second positioning block has one or more axial fluid channels on its shaft, end face, or outer side, or the second positioning block has fluid channels connecting the two ends of the second positioning block; the outer side of the second positioning block may have one or more annular grooves to facilitate roll pressing and fixing.

[0049] The annular groove may not be provided on the outer side of the second positioning block.

[0050] The first positioning block can be disposed entirely or partially in the valve body, or one end of the valve body can be inserted into the first positioning block for fixed connection.

[0051] The outer wall of the first positioning block may be provided with a groove or annular groove, or it may be provided with a step, or it may be a smooth rotating body.

[0052] The inner wall of the valve body and the first positioning block can be fixedly connected to form an integral structure. The fixing method can be roll forming, welding, or interference fit, or the two ends can be interlocked, or the valve body parts at both ends of the first positioning block can be fixed by narrowing or reducing the diameter.

[0053] The valve body and the first positioning block can also be an integral structure, manufactured as a whole component, with the first positioning block being a part of the valve body.

[0054] An axial flow channel may not be provided on the outside of the first positioning block. The front part of the first positioning block has a cylindrical structure around it, and one end of the valve body may be located inside the first positioning block.

[0055] The front or front end of the first positioning block may be provided with a step, annular groove, recess, cavity, hole, or thin rod to facilitate the setting of the first adjusting spring and coaxial positioning.

[0056] The second positioning block can be integrally or partially disposed within the valve body, or one end of the valve body can be inserted into the second positioning block for fixed connection.

[0057] The outer wall of the second positioning block may be provided with grooves or annular grooves, or it may be provided with steps or a smooth rotating body.

[0058] The inner wall of the valve body and the second positioning block can be fixedly connected to form an integral structure. The fixing method can be roll forming, welding, or interference fit, or the two ports can be interlocked, or the valve body parts at both ends of the second positioning block can be fixed by narrowing or reducing the diameter.

[0059] The valve body and the second positioning block can also be an integral structure, machined as a single component, with the second positioning block being a part of the valve body.

[0060] An axial flow channel may not be provided on the outer side of the second positioning block. The front part of the second positioning block has a cylindrical structure around it, and one end of the valve body may be located inside the second positioning block.

[0061] The front or front end of the second positioning block may be provided with a step, annular groove, recess, cavity, hole, or thin rod to facilitate the installation of the second adjusting spring and coaxial positioning.

[0062] To prevent the valve needle from rotating, a stop rod to prevent the valve needle from rotating may also be provided on the outer edge or outside of the first or second valve needle.

[0063] The valve body can also be composed of multiple sections. The slider, first valve seat, second valve seat, first valve needle and first valve needle spring, second valve needle and second valve needle spring, first positioning spring, first positioning block, second positioning spring and second positioning block and other components can be individually or in combination and respectively disposed in one or more valve bodies to form multiple components. Then, the various components are combined and connected into a whole in a certain order.

[0064] A filter screen can be installed in one or both interface channels of the bidirectional adaptive throttle valve.

[0065] The second aspect of this utility model proposes a bidirectional adaptive throttling refrigeration device, which includes a bidirectional adaptive throttling valve structure as described in any of the above technical solutions.

[0066] Compared with the prior art, the beneficial effects of this utility model are: this utility model uses variable flow throttling as a bidirectional adaptive throttling valve. Initially, under the action of the first valve needle and the second valve needle, the valve ports of the two valve seats are in a closed equilibrium state.

[0067] When fluid flows into the bidirectional adaptive throttle valve from one end, it passes through the fluid flow channels in the first positioning block and the first valve seat. Under pressure, the corresponding slider slides towards the opposite second valve seat, closing the non-axial channel of that valve seat. The fluid then passes through the axial throttling orifice of the second valve seat, pushing the corresponding second valve needle to open the valve port of the second valve seat, thus achieving throttling flow. The fluid then flows out from the other end of the bidirectional adaptive throttle valve, completing throttling flow in one direction. Conversely, when fluid flows into the bidirectional adaptive throttle valve from the other end, it passes through the fluid flow channels in the second positioning block and the second valve seat. Under pressure, the corresponding slider slides towards the opposite first valve seat, closing the non-axial channel of that valve seat. The fluid then passes through the axial throttling orifice of the first valve seat, pushing the corresponding first valve needle to open the valve port of the first valve seat, thus achieving throttling flow. The fluid then flows out from the other end of the bidirectional adaptive throttle valve, achieving bidirectional throttling flow.

[0068] When the fluid passes through the valve orifice at the axis of the first valve seat, the flow rate or pressure difference increases, and the thrust of the fluid on the first valve needle also increases. The original balance of the first valve needle is broken, the first valve needle moves, the first positioning spring is further compressed, and the valve orifice of the first valve seat is opened wider. Under the action of the first valve needle spring, the first positioning spring, and the fluid pressure, the force on the first valve needle will be rebalanced. Similarly, when the flow rate decreases or the pressure difference decreases, the thrust of the fluid on the first valve needle decreases, the first valve needle spring returns to its original compression, the first valve needle moves in the opposite direction, and the valve orifice of the first valve seat is closed. Under the action of the fluid pressure of the first valve needle spring, the first positioning spring, etc., the force on the first valve needle is rebalanced. When the flow is reversed, the fluid is throttled through the second valve seat orifice. As the incoming fluid flow rate or pressure difference increases, the thrust of the fluid on the second valve needle also increases, breaking the original balance of the second valve needle. The second valve needle moves, the second positioning spring is further compressed, and the second valve seat orifice opens wider. Under the action of the second valve needle spring, the second positioning spring, and the fluid pressure, the forces on the second valve needle will rebalance. Similarly, when the flow rate decreases or the pressure difference decreases, the thrust of the fluid on the second valve needle decreases, the second valve needle spring returns to its original compression, the second valve needle moves in the reverse direction, and the second valve seat orifice closes. Under the action of the second valve needle spring, the second positioning spring, and the fluid pressure, the forces on the second valve needle will rebalance. This achieves adaptive throttling under bidirectional variable flow rate or variable pressure difference.

[0069] Furthermore, the damping effect of the compressed first or second valve needle spring and the compressed first and second positioning springs reduces the oscillation of the throttling flow caused by pressure fluctuations, thus reducing noise generated by the vibration of the first or second valve needle. The flared inlet and outlet effectively reduce flow eddies, minimizing or eliminating eddies, further reducing flow noise. Since all components are mechanical, and the damping effect of the springs at both ends of each valve needle results in small displacement of moving parts and minimal valve needle oscillation, virtually eliminating mechanical collision noise. The chamfered or flared valve port design further reduces flow noise, ensuring high reliability. The absence of complex control strategies lowers the unit's failure rate, making the refrigeration unit simpler, more reliable, and cost-effective. It also facilitates maintenance and replacement, improving the overall reliability of the refrigeration unit. This achieves the goal of simplifying and automating the control of the throttling mechanism. Attached Figure Description

[0070] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0071] Figure 1 This is a schematic diagram of a bidirectional adaptive throttle valve.

[0072] Among them, 1-valve body, 2-first positioning block, 3-first positioning spring, 4-first valve needle, 5-first valve needle spring, 6-first valve seat, 7-slider, 8-second valve seat, 9-second valve needle spring, 10-second valve needle, 11-second positioning spring, 12-second positioning block. Detailed Implementation

[0073] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures, and should not be construed as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0074] like Figure 1 As shown in the diagram, this embodiment provides a structural schematic of a bidirectional adaptive throttle valve. It can be implemented as follows:

[0075] The assembly process of the bidirectional adaptive throttle valve involves pre-processing the valve body 1, first positioning block 2, first positioning spring 3, first valve needle 4, first valve needle spring 5, first valve seat 6, slider 7, second valve seat 8, second valve needle spring 9, second valve needle 10, second positioning spring 11, and second positioning block 12. Then, the first positioning block 2, first positioning spring 3, first valve needle 4, and first valve needle spring 5 are sequentially assembled into the first valve needle assembly. Finally, the second positioning block 12, second positioning spring 11, second valve needle 10, and second valve needle spring 9 are sequentially assembled into the second valve needle assembly. The procedure can be as follows: Roll the first valve seat 6 onto a suitable position near the middle of the inner wall of the fixed valve body 1. Insert the slider 2 and the second valve seat 8 sequentially and at intervals from another interface of the valve body 1, ensuring that the slider 2 has axial sliding space between the first valve seat 6 and the second valve seat 8. Roll the second valve seat 8 to fix it to the inner wall of the valve body 1. Then, insert the assembled first valve needle assembly and the second valve needle assembly from the left and right ends of the valve body 1 respectively. Push the first positioning block 2 and the second positioning block 12 to a suitable position inside the valve body 1 with appropriate force, and roll the first positioning block 2 and the second positioning block 12 to fix them.

[0076] When installed in a refrigeration unit, initially, both the throttling valve ports of the first valve seat 6 and the second valve seat 8 are in a closed equilibrium state. When fluid flows in from the left port of the bidirectional adaptive throttling valve, the throttling valve port of the first valve seat 6 is closed, and the fluid flows through the axial channel on the first valve seat 6. Under the action of fluid pressure, the slider 7 slides towards the corresponding second valve seat 8 and closes the non-axial channel of that valve seat. The fluid then passes through the axial throttling valve port of the second valve seat 8, pushing the second valve needle 10 to open the valve port of the second valve seat 8, thus achieving throttling flow, and flows out from the axial channel on the second positioning block 12, completing throttling flow in one direction. Conversely, when fluid flows in from the right end of the bidirectional adaptive throttling valve, under the action of fluid pressure, the slider 7 slides towards the corresponding first valve seat 6 and closes the non-axial channel of that valve seat. The fluid then passes through the axial throttling valve port of the first valve seat 6, pushing the first valve needle 4 to open the throttling valve port of the first valve seat 6, thus achieving throttling flow, and flows out from the axial channel on the first positioning block 2, realizing bidirectional throttling flow.

[0077] The above provides a detailed description of one embodiment of the bidirectional adaptive throttle valve and expansion valve provided by this utility model. A specific example has been used to illustrate the principle and implementation of this utility model. The description of the above embodiment is only for the purpose of helping to understand the method and core idea of ​​this utility model.

[0078] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0079] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification.

[0080] In the description of this utility model, it should be understood that the directional terms such as "front section, rear section, front part, tail part, rear part, tail segment, end section", "front end, rear end, upper end, lower end, end, left end, right end", "longitudinal, transverse" and "upper part, lower part, side, bottom surface, front, back, left, right, first, second", etc., indicate the orientation, position or sequence relationship based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0081] Furthermore, it should be noted that the use of words such as "first," "then," "again," "first," and "second" to limit the processing or installation sequence is merely for the convenience of describing this utility model. Unless otherwise stated, the above words have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0082] It should be noted that, for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

[0083] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bidirectional adaptive throttle valve, comprising at least a valve body and a slider disposed within the valve body, a first valve seat, a second valve seat, a first valve needle and a first valve needle spring, a second valve needle and a second valve needle spring, a first positioning spring and a first positioning block, a second positioning spring and a second positioning block; The slider is disposed in the middle portion of the valve body. The first valve seat and the second valve seat are disposed opposite each other in the valve body on both sides of the slider. The slider can slide axially within the space between the first valve seat and the second valve seat. The first valve needle and the second valve needle are respectively disposed opposite each other in the valve body behind the first valve seat and the second valve seat, and the pointed ends of the first valve needle and the second valve needle are respectively opposite to the valve holes of the first valve seat and the second valve seat. The first valve needle spring is sleeved on the outside of the front end of the first valve needle, with one end of the first valve needle spring disposed on the first valve seat and the other end disposed on the outside of the front end of the first valve needle. The second valve needle spring is sleeved on the front end of the second valve needle. On the outside, one end of the second valve needle spring is disposed on the second valve seat, and the other end is disposed on the outside of the front section of the second valve needle. The first positioning block is disposed at intervals in the valve body behind the first valve needle. The first positioning spring is disposed between the tail of the first valve needle and the front of the first positioning block. One end of the first positioning spring is disposed at the tail of the first valve needle, and the other end is disposed on the first positioning block. The second positioning block is disposed at intervals in the valve body behind the second valve needle. The second positioning spring is disposed between the tail of the second valve needle and the front of the second positioning block. One end of the second positioning spring is disposed at the tail of the second valve needle, and the other end is disposed on the second positioning block. The slider is provided with an axial channel; The first valve seat has an axial throttle valve hole on its central shaft, and one or more fluid channels connecting the two end faces are provided on the outer side or end face of the first valve seat. The second valve seat has an axial throttle valve hole on its central shaft, and one or more fluid channels connecting the two end faces are provided on the outer side or end face of the second valve seat. The first positioning block has one or more axial fluid channels on its shaft center, end face or outer side, or the first positioning block has fluid channels connecting the two ends of the first positioning block. The second positioning block has one or more axial fluid channels on its shaft, end face or outer side, or the second positioning block has fluid channels connecting the two ends of the second positioning block.

2. The bidirectional adaptive throttle valve according to claim 1, characterized in that, The first valve needle is provided with a fluid channel or a channel connecting the front and rear or inner and outer spaces of the first valve needle.

3. The bidirectional adaptive throttle valve according to claim 1, characterized in that, The second valve needle is provided with a fluid channel or a channel connecting the front and rear or inner and outer spaces of the second valve needle.

4. The bidirectional adaptive throttle valve according to claim 1, characterized in that, The inlet and outlet of the valve hole channel on the axis of the first or second valve seat are set in a flared shape or chamfered.

5. The bidirectional adaptive throttle valve according to claim 1, characterized in that, The first valve needle has a step, annular groove, recess, cavity, hole, or thin rod at its tail or end. The second valve needle has a step, annular groove, recess, cavity, hole, or thin rod at its tail or end.

6. The bidirectional adaptive throttle valve according to claim 1, characterized in that, The front or front end of the first positioning block may be provided with a step, an annular groove, a recess, a cavity, a hole, or a thin rod, and the front or front end of the second positioning block may be provided with a step, an annular groove, a recess, a cavity, a hole, or a thin rod.

7. The bidirectional adaptive throttle valve according to claim 1, characterized in that, The first positioning block can be disposed entirely or partially in the valve body, or one end of the valve body can be inserted into the first positioning block for fixed connection.

8. The bidirectional adaptive throttle valve according to claim 1, characterized in that, The second positioning block can be integrally or partially disposed within the valve body, or one end of the valve body can be inserted into the second positioning block for fixed connection.

9. The bidirectional adaptive throttle valve according to claim 1, characterized in that, A filter screen can be installed in one or both interface pipe channels of the bidirectional adaptive throttle valve.

10. A bidirectional adaptive throttling refrigeration device, characterized in that, The bidirectional adaptive throttling refrigeration device includes: a bidirectional adaptive throttling valve structure as described in any one of claims 1 to 9.

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