Bidirectional self-adaptive throttle valve and refrigeration equipment

Abstract

A bidirectional self-adaptive throttle valve at least comprises a valve body, a sliding block, a first valve seat, a second valve seat, a first valve needle, a first valve needle spring, a second valve needle, a second valve needle spring, a first positioning spring, a first positioning block, a second positioning spring and a second positioning block, the first valve seat and the second valve seat are oppositely arranged in the valve body on the two sides of the sliding block, and the sliding block can axially slide in the space between the first valve seat and the second valve seat. Under the action of fluid pressure, the two sets of valve needles, the valve needle springs, the two sets of positioning springs, the sliding block and the like are matched with one another according to the pressure to automatically open and close corresponding valve ports, the opening degrees of the valve ports are automatically adjusted according to the fluid pressure, and bidirectional self-adaptive throttling is achieved. The variable-flow two-way throttling mechanism can achieve variable-flow two-way throttling, under the restraining damping effect of the corresponding valve needle spring and the positioning spring, the corresponding valve needle is small in vibration and high in reliability, and the control problem of the throttling mechanism can be simplified and automated.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, in particular to a throttling mechanism, and in particular to an adaptive throttling valve and refrigeration equipment using the adaptive throttling valve. Background Art

[0002] In the prior art, the throttling devices between the evaporator and condenser of refrigeration equipment generally consist of 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). Current adjustable flow elements are relatively expensive, and electronic expansion valves, in particular, require corresponding control strategies. They are also prone to jamming and have low reliability. The throttling method of non-adjustable flow elements can only provide a throttling effect of a fixed length or fixed opening, and cannot be adjusted according to flow rate or pressure changes on both sides. While they have poor adaptability to throttling conditions, they are still widely used in refrigeration equipment at a low cost. However, in air conditioning systems that use throttle valves as the throttling device, the throttle valve changes throttling direction based on the system's high and low pressures. However, in actual use, the throttle valve needle may become stuck, affecting the normal operation of the air conditioner. Furthermore, the throttle valve needle is prone to vibration during axial movement, generating vortices when the refrigerant flows through the throttle valve, resulting in mechanical and flow noise. If a throttling tube (valve) can achieve a flow-adaptive throttling effect, realizing variable flow adaptive throttling, it would not only save material and manufacturing costs, but also control strategy costs. Therefore, how to simplify the control problem of the throttling mechanism, automate simple problems, and adapt to the two-way switching of cooling / heating, as well as how to achieve variable flow or adaptive throttling under variable pressure of the throttling valve, reduce noise, lower failure rate, facilitate maintenance and replacement, improve equipment reliability, and simultaneously meet the needs of cooling and heating are the pursuits of industry engineers and researchers. Summary of the Invention

[0003] To overcome the defects and shortcomings of the existing technology, the present invention provides a bidirectional adaptive throttling valve and a bidirectional adaptive throttling refrigeration device, which effectively solves the problem that the existing expansion valve cannot achieve adaptive throttling effect under variable flow or pressure difference, maintains the cooling or heating effect, reduces the risk of jamming and noise, effectively improves the reliability of the refrigeration equipment operation, and effectively and quickly achieves the needs of cooling and heating. To this end, the present invention adopts the following technical solutions:

[0004] To this end, the first aspect of the present invention provides a bidirectional adaptive throttling valve. The second aspect of the present invention provides a bidirectional adaptive throttling refrigeration device.

[0005] According to one aspect of the present invention, the following technical solutions are implemented:

[0006] A bidirectional adaptive throttle valve is provided, which at least includes a valve body and a slider arranged in 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 and other components.

[0007] The slider is arranged in the middle part of the valve body, and the first positioning block, the first positioning spring, the first valve needle, the first valve needle spring, the first valve seat and other components are symmetrically arranged on both sides of the slider, and the second valve seat, the second valve needle spring, the second valve needle, the second positioning spring, the second positioning block and other components are respectively arranged symmetrically on both sides of the slider, and the first valve seat and the second valve seat are arranged in the valve body on both sides of the slider with relative spacing, and the slider can slide axially in the space between the first valve seat and the second valve seat, and the first valve needle and the second valve needle are respectively arranged in the valve body behind the first valve seat and the second valve seat, and the tapering parts of the front sections 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, and the first valve needle spring is sleeved on the outside of the front section of the first valve needle, and the first One end of the valve needle spring is arranged on the first valve seat, and the other end is arranged on the outside of the front section of the first valve needle. 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 is arranged on the second valve seat, and the other end is arranged on the outside of the front section of the second valve needle. The first positioning block is arranged in the valve body behind the first valve needle at intervals, and the first positioning spring is arranged between the tail of the first valve needle and the front of the first positioning block. One end of the first positioning spring is arranged at the tail of the first valve needle, and the other end is arranged on the first positioning block. The second positioning block is arranged in the valve body behind the second valve needle at intervals, and the second positioning spring is arranged between the tail of the second valve needle and the front of the second positioning block. One end of the second positioning spring is arranged at the tail of the second valve needle, and the other end is arranged 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 an axial channel or a fluid channel communicating with both ends of the first positioning block, which is a fluid channel.

[0010] The second positioning block is provided with an axial channel or a fluid channel communicating with both ends of the second positioning block, which is a fluid channel.

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

[0012] The outer edges of the middle channel on both end surfaces of the slider can be set to a conical protrusion or concave shape, so that when the slider moves to the contact surface of the first valve seat or the second valve seat, it is embedded and axially positioned without generating lateral displacement, thereby eliminating or reducing noise generation. Of course, the two end surfaces of the slider can also be set to be flat.

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

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

[0015] An axial throttle valve hole is provided on the central axis of the first valve seat, and one or more fluid channels connecting the two end surfaces are provided on the outer side or end surface of the first valve seat. The outer side of the first valve seat may be provided with one or more annular grooves, or may not be provided with annular grooves.

[0016] The central axis of the second valve seat is provided with an axial throttle valve hole, and the outer side or end surface of the second valve seat is provided with one or more fluid channels connecting the two end surfaces. The outer side of the second valve seat may be provided with one or more annular grooves, or may not be provided with annular grooves.

[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 communicating with the front and rear spaces or the inner and outer spaces of the first valve needle.

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

[0020] The end surface of the first valve seat or the second valve seat can be provided with a step. One end or both end surfaces of the first valve seat or the second valve seat can be provided with a groove, a cylindrical opening, a recessed cavity, an annular groove or a step, or can also be provided with a flat surface.

[0021] An annular support or annular ring of a valve needle spring may be provided on the end surface 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 combined valve seat assembly, respectively, and the valve seat assembly at least includes a valve seat body and a valve hole core, the outer side or end face of the valve seat body is provided with an axial through hole, the valve hole core is provided with a throttle valve hole, the valve seat body is provided with an axial hole, and the valve hole core is nested and fixed in the axial hole of the valve seat body.

[0023] The inlet and outlet of the valve hole channel at the central axis of the first valve seat or the second valve seat can be configured to be bell-mouth shaped or chamfered, which can reduce the generation of flow vortexes.

[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 mounted on the outer wall, step, or annular groove of the first valve needle, and the other end can be mounted on the first valve seat. Both ends of the first valve needle spring can be fixed to the contacting surface, one end can be fixed and the other end can be free, or both ends can be unfixed.

[0025] The second valve needle spring is sleeved on the outside of the second valve needle front section. One end of the second valve needle spring can be mounted on the outer wall, step, or annular groove of the second valve needle, and the other end can be mounted on the second valve seat. Both ends of the second valve needle spring can be fixed to the contacting surface, one end can be fixed and the other end can be free, or neither end can be fixed.

[0026] To ensure that the first valve needle spring and its end surface are flat and maintain the coaxiality between the first valve needle and the throttle valve hole of the first valve seat, a transition flattening ring can be installed at one or both ends of the first valve needle spring. The purpose of the transition flattening ring is to ensure that the first valve needle spring is flatly installed on the surface of the object it contacts, maintaining the coaxiality of the first valve needle during installation.

[0027] To smooth the end surfaces of the second valve needle spring and the second valve needle spring and maintain coaxiality between the second valve needle and the throttle hole of the second valve seat, a transition smoothing ring can be installed at one or both ends of the second valve needle spring. The purpose of the transition smoothing ring is to ensure that the second valve needle spring can be placed flat on the surface it contacts, maintaining the coaxiality of the second valve needle during installation.

[0028] The first valve needle spring or the second valve needle spring may be a flat head spring.

[0029] For simplicity, the first valve needle spring or the second valve needle spring may not be provided with transition flat rings at both ends.

[0030] The outer surface of the first valve needle or the second valve needle may be composed of the same or different revolution 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 may be provided at the step of the first valve needle or the second valve needle, and one end of the first valve needle spring or the second valve needle spring may be embedded in the annular groove.

[0034] A fluid flow channel may be provided on or outside the first valve needle or the second valve needle, or of course no flow channel may be provided.

[0035] The tail or end of the first valve needle may be provided with a step, a ring groove, a groove, a cavity, a hole, or a thin rod, so as to facilitate the arrangement of the first positioning spring.

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

[0037] In order to make the end surface of the positioning spring flat and maintain the coaxiality of the valve needle, a transition flat ring can be set at one end 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 flatly on the surface of the contacted object.

[0038] The first positioning spring or the second positioning spring may be a flat head spring.

[0039] For simplicity, the first positioning spring or the second positioning spring may not be provided with transition flat rings at both ends.

[0040] The two ends of the first positioning spring and the second positioning spring are respectively arranged 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 contact surface, or one end is fixed and the other end is not fixed, or both ends are not fixed.

[0041] A cavity may be provided at the tail end or the tail portion of the first valve needle, a step may be provided in the cavity, and one end of the first positioning spring may be placed in the cavity.

[0042] A cavity may be provided at the tail end or the tail portion of the second valve needle, a step may be provided in the cavity, and one end of the second positioning spring may be placed in 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 arranged on the inner wall of the valve body.

[0046] One or more axial fluid channels are provided on the axis, end surface or outside of the first positioning block, or the first positioning block is provided with a fluid channel connecting the two ends of the first positioning block; one or more annular grooves can be provided on the outside of the first positioning block to facilitate rolling and fixing.

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

[0048] One or more axial fluid channels are provided on the axis, end surface or outside of the second positioning block, or the second positioning block is provided with a fluid channel connecting the two ends of the second positioning block; one or more annular grooves can be provided on the outside of the second positioning block to facilitate rolling and fixing.

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

[0050] The first positioning block may be disposed in its entirety or in part within the valve body, or one end of the valve body may be inserted into the first positioning block and fixedly connected thereto.

[0051] The outer wall of the first positioning block may be provided with a groove or an annular groove, may be provided with a step, or 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, and the fixing method can be rolling fixing, welding fixing, interference fit fixing, or mutual engagement between the ports of the two, or fixing by shrinking or reducing the valve body parts at both ends of the first positioning block, etc.

[0053] The valve body and the first positioning block may also be an integral structure, processed as a whole as one component, and the first positioning block is a part of the valve body.

[0054] An axial flow channel may not be provided on the outer side of the first positioning block. The front section of the first positioning block is surrounded by a cylindrical structure. One end of the valve body may be provided in the first positioning block.

[0055] The front portion or front end of the first positioning block may be provided with a step, a ring groove, a groove, a cavity, a hole, or a thin rod, so as to facilitate the setting of the first adjustment spring and coaxial positioning.

[0056] The second positioning block can be disposed in its entirety or in part within the valve body, or one end of the valve body can be inserted into the second positioning block and fixedly connected thereto.

[0057] The outer wall of the second positioning block may be provided with a groove or an annular groove, may be provided with a step, or may be 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, and the fixing method can be rolling fixing, welding fixing, interference fit fixing, or mutual engagement between the ports of the two, or fixing by shrinking or reducing the valve body parts at both ends of the second positioning block, etc.

[0059] The valve body and the second positioning block may also be an integral structure, processed as a whole as one component, and the second positioning block is 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 section of the second positioning block is surrounded by a cylindrical structure, and one end of the valve body may be provided in the second positioning block.

[0061] The front portion or front end of the second positioning block may be provided with a step, a ring groove, a groove, a cavity, a hole, or a thin rod, so as to facilitate the setting of the second adjustment spring and coaxial positioning.

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

[0063] The valve body can also be composed of multiple sections, and 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 arranged separately or in combination in one or more valve bodies to form multiple components, and then the various components are combined and connected into one in a certain order.

[0064] A filter may be provided in one interface or two interface channels of the bidirectional adaptive throttle valve.

[0065] A second aspect of the present invention provides a bidirectional adaptive throttling refrigeration device, which includes: a bidirectional adaptive throttling valve structure as in any of the above technical solutions.

[0066] Compared with the prior art, the present invention has the following advantages: the present invention is used as a bidirectional adaptive throttle valve using variable flow throttling. Initially, the first valve needle and the second valve needle are respectively in a closed equilibrium state under the action of the first valve needle spring, the first positioning spring, the second valve needle spring, and the second positioning spring.

[0067] When fluid flows into the bidirectional adaptive throttle valve from one end, passes through the fluid flow channel in the first positioning block and the first valve seat, and under the action of pressure, the corresponding slider slides toward the opposite second valve seat and closes the non-axial channel of the valve seat. The fluid passes through the axial throttle hole of the second valve seat, pushing the corresponding second valve needle to open the valve port of the second valve seat, performing throttling flow, and then flows out from the other end of the bidirectional adaptive throttle valve to complete throttling flow in one direction. Conversely, when fluid flows into the bidirectional adaptive throttle valve from the other end, passes through the fluid flow channel in the second positioning block and the second valve seat, and under the action of pressure, the corresponding slider slides toward the opposite first valve seat and closes the non-axial channel of the valve seat. The fluid passes through the axial throttle hole of the first valve seat, pushing the corresponding first valve needle to open the valve port of the first valve seat, performing throttling flow, and then flows out from the other end of the bidirectional adaptive throttle valve to achieve bidirectional throttle flow.

[0068] The fluid is throttled through the valve hole at the axis of the first valve seat. As the incoming fluid flow rate increases or the pressure difference increases, the thrust of the fluid on the first valve needle will also increase, and the original balance force of the first valve needle will be broken, the first valve needle moves, and the first positioning spring is further compressed, opening the valve port of the first valve seat. 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 recovers and is compressed, the first valve needle moves in the opposite direction, and the valve port of the first valve seat is closed. Under the action of the first valve needle spring, the first positioning spring and other fluid pressures, the force on the first valve needle is rebalanced. During reverse flow, the fluid throttles through the second valve seat orifice. As the incoming fluid flow rate or pressure differential increases, the fluid thrust on the second valve needle also increases, breaking the original balance of the second valve needle, causing the second valve needle to move, further compressing the second positioning spring, and opening the second valve seat orifice. Under the action of the second valve needle spring, the second positioning spring, and the fluid pressure, the force on the second valve needle is rebalanced. Similarly, when the flow rate decreases or the pressure differential decreases, the fluid thrust on the second valve needle decreases, the second valve needle spring recovers and compresses, the second valve needle moves in the opposite direction, and the second valve seat orifice is closed. Under the action of the second valve needle spring, the second positioning spring, and other fluid pressures, the force on the second valve needle is rebalanced. This achieves adaptive throttling under bidirectional variable flow or variable pressure differential.

[0069] In addition, due to the restraining and damping effect of the compressed first valve needle spring or second valve needle spring and the compressed first positioning spring and second positioning spring, the throttling flow rate oscillation caused by pressure fluctuations can be reduced, and the noise generated by the vibration of the first valve needle or second valve needle can be reduced. In addition, the trumpet-shaped inlet and outlet can effectively reduce flow vortex, resulting in less vortex or vortex-free flow, further reducing flow noise. Moreover, since they are all mechanical components and the damping effect of the springs at both ends of each valve needle, the displacement of the moving parts is small, the valve needle oscillation is small, and mechanical collision noise can be basically eliminated. In addition, the valve port chamfer or trumpet design helps to reduce flow noise, and has high reliability. Without complicated control strategies, the failure rate of the unit operation is reduced, making the refrigeration unit simple and reliable, reducing costs, and facilitating maintenance and replacement, thereby improving the reliability of the refrigeration unit operation. The purpose of simplifying the control problems of the throttling mechanism and automating simple problems is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0071] Figure 1 A structural 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 DESCRIPTION

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

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

[0075] The valve body 1, the first positioning block 2, the first positioning spring 3, the first valve needle 4, the first valve needle spring 5, the first valve seat 6, the slider 7, the second valve seat 8, the second valve needle spring 9, the second valve needle 10, the second positioning spring 11, and the second positioning block 12 are processed separately in advance, and then the first positioning block 2, the first positioning spring 3, the first valve needle 4, and the first valve needle spring 5 are assembled in sequence into the first valve needle assembly, and the second positioning block 12, the second positioning spring 11, the second valve needle 10, and the second valve needle spring 9 are assembled in sequence into the second valve needle assembly; the assembly process of the two-way adaptive throttle valve It can be done as follows: roll the first valve seat 6 to 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 in sequence from the other interface of the valve body 1, and make the slider 2 have an axial sliding space between the first valve seat 6 and the second valve seat 8, and roll the second valve seat 8 to fix it on the inner wall of the valve body 1, and then insert the assembled first valve needle assembly and 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 the appropriate positions in 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 device, the throttle valve openings of the first valve seat 6 and the second valve seat 8 are initially in a closed equilibrium state. When fluid flows in from the left port of the bidirectional adaptive throttle valve, the throttle valve opening of the first valve seat 6 is closed. As the fluid flows through the axial channel on the first valve seat 6, the slider 7, under the action of fluid pressure, slides toward the corresponding second valve seat 8 and closes the non-axial channel of the valve seat. The fluid passes through the axial throttle valve opening of the second valve seat 8, pushing the second valve needle 10 to open the valve opening of the second valve seat 8, throttling the fluid and then flowing 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 throttle valve, the slider 7, under the action of fluid pressure, slides toward the corresponding first valve seat 6 and closes the non-axial channel of the valve seat. The fluid passes through the axial throttle valve opening of the first valve seat 6, pushing the first valve needle 4 to open the throttle valve opening of the first valve seat 6, throttling the fluid and then flowing out from the axial channel on the first positioning block 2, achieving bidirectional throttle flow.

[0077] The above describes in detail an embodiment of the bidirectional adaptive throttle valve and expansion valve provided by the present invention. This article uses a specific example to illustrate the principle and implementation of the present invention. The above embodiment is only used to help understand the method and core concept of the present invention.

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

[0079] Unless otherwise specified, the relative arrangement of components and steps, numerical expressions, and numerical values described in these embodiments do not limit the scope of the present invention. It should also be understood that for ease of description, the dimensions of the various parts shown in the drawings are not drawn to scale. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be considered part of the specification.

[0080] In the description of the present invention, it should be understood that the directions or positions or sequential relationships indicated by directional words such as "front section, rear section, front part, tail, rear, tail section, last 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. are usually based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words 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 cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0081] In addition, it should be noted that the use of words such as "first", "then", "again", "first", and "second" to limit the processing or installation order is only for the convenience of describing the present invention. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0082] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0083] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A bidirectional adaptive throttle valve, comprising at least a valve body and a slider arranged in 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 arranged in the middle part of the valve body, the first valve seat and the second valve seat are arranged in the valve body on both sides of the slider with relative spacing, and the slider can slide axially in the space between the first valve seat and the second valve seat. The first valve needle and the second valve needle are respectively arranged in the valve body behind the first valve seat and the second valve seat, and the tapering parts of the front sections 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 section of the first valve needle. One end of the first valve needle spring is arranged on the first valve seat, and the other end is arranged on the outside of the front section of the first valve needle. The second valve needle spring is sleeved on the front section of the second valve needle. On the outside, one end of the second valve needle spring is arranged on the second valve seat, and the other end is arranged on the outside of the front section of the second valve needle. The first positioning block is arranged in the valve body behind the first valve needle, and the first positioning spring is arranged between the tail of the first valve needle and the front of the first positioning block. One end of the first positioning spring is arranged at the tail of the first valve needle, and the other end is arranged on the first positioning block. The second positioning block is arranged in the valve body behind the second valve needle, and the second positioning spring is arranged between the tail of the second valve needle and the front of the second positioning block. One end of the second positioning spring is arranged on the tail of the second valve needle, and the other end is arranged on the second positioning block. An axial channel is provided on the sliding block. An axial throttle valve hole is provided on the central axis of the first valve seat, and one or more fluid channels communicating with the two end surfaces are provided on the outer side or end surface of the first valve seat. An axial throttle valve hole is provided on the central axis of the second valve seat, and one or more fluid channels communicating with the two end surfaces are provided on the outer side or end surface of the second valve seat. One or more axial fluid channels are provided on the axis, end surface or outer side of the first positioning block, or the first positioning block is provided with fluid channels communicating with both ends of the first positioning block. One or more axial fluid channels are provided on the axis, end surface or outer side of the second positioning block, or the second positioning block is provided with fluid channels communicating with both 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 communicating with the front and rear spaces or the 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 communicating with the front and rear spaces or the 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 of the axis of the first valve seat or the second valve seat are configured to be bell-mouth shaped or chamfered.

5. The bidirectional adaptive throttle valve according to claim 1, characterized in that: The tail or end of the first valve needle is provided with a step, an annular groove, a groove, or a cavity, a hole, or a thin rod, and the tail or end of the second valve needle is provided with a step, an annular groove, a groove, or a cavity, a hole, or a thin rod.

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

7. The bidirectional adaptive throttle valve according to claim 1, characterized in that: The first positioning block may be disposed in its entirety or in part within the valve body, or one end of the valve body may be inserted into the first positioning block and fixedly connected thereto.

8. The bidirectional adaptive throttle valve according to claim 1, characterized in that: The second positioning block can be disposed in its entirety or in part within the valve body, or one end of the valve body can be inserted into the second positioning block and fixedly connected thereto.

9. The bidirectional adaptive throttle valve according to claim 1, characterized in that: A filter can be provided in one interface or two 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 comprises: a bidirectional adaptive throttling valve structure according to any one of claims 1 to 9.

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