Adjustable bidirectional adaptive throttle and refrigeration device

Abstract

The adjustable bidirectional adaptive throttle valve at least comprises a first valve body, a second valve body, a first valve seat, a first valve needle, a first valve needle spring, a first adjusting spring, a first adjusting limit block, a second valve seat, a second valve needle, a second valve needle spring, a second adjusting spring and a second adjusting limit block, the pre-tightening force of the corresponding spring is adjusted by the first adjusting limit block and the second adjusting limit block to control the force opening state of the corresponding valve needle, the first valve needle and the second valve needle can move axially in the valve body under the action of force to reduce or enlarge the flow area of the valve port. The adjustable bidirectional adaptive throttle valve is used to realize adjustable variable flow throttling, the first valve needle and the second valve needle have small oscillation under the damping effect of the corresponding valve needle spring and adjusting spring, the bidirectional throttling is high in reliability, and the control problem of the throttling mechanism is simplified and automated.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, and to a throttling mechanism, specifically to an adjustable bidirectional adaptive throttling valve and refrigeration equipment. 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 an adjustable bidirectional adaptive throttling valve. The second aspect of this utility model proposes an adjustable bidirectional adaptive throttling refrigeration device.

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

[0006] An adjustable bidirectional adaptive throttle valve is provided, comprising at least a first valve body, a second valve body, a first valve seat, a first valve needle, a first valve needle spring, a first adjusting spring, a first adjusting limit block, a second valve seat, a second valve needle, a second valve needle spring, a second adjusting spring, and a second adjusting limit block.

[0007] The first valve seat is wholly or partially disposed within the first valve body, or the front portion of the first valve body is inserted into the first valve seat for fixed connection, or the first valve seat and the first valve body are an integral structure. The first valve needle spring, the first valve needle, the first adjusting spring, and the first adjusting limit block can be sequentially disposed within the inner cavity of the first valve body behind the first valve seat. The first valve seat is provided with a throttle valve hole. The tip of the first valve needle is opposite to the valve opening of the throttle valve hole. The first valve needle spring is sleeved on the outside of the first valve needle. One end of the first valve needle spring is disposed on the first valve needle, and the other end is disposed on the first valve seat. The first adjusting spring is disposed between the first valve needle and the first adjusting limit block. One end of the first adjusting spring is disposed at the tail end or tail of the first valve needle, and the other end of the first adjusting spring is disposed at the front or front end of the first adjusting limit block. The first adjusting limit block and the inner wall of the first valve body are either threadedly connected, or connected by a threaded connection between a threaded sleeve fixedly disposed on the inner wall of the first valve body, or connected by a rail sleeve fixedly disposed on the inner wall of the first valve body.

[0008] The first valve needle is axially movable. The first valve needle spring provides a thrust that causes the first valve needle to move away from the throttle valve orifice. The first adjusting spring provides a preload that causes the first valve needle to move towards the throttle valve orifice. A gap is left between the first valve needle and the inner wall of the first valve body. The first valve needle is subjected to the elastic forces of the first valve needle spring and the first adjusting spring at the front and rear, respectively. Under the action of force, the first valve needle can move axially within the first valve body to close or open the flow area of ​​the first valve orifice.

[0009] The second valve seat is integrally or partially disposed within the second valve body, or the front portion of the second valve body is inserted into the second valve seat for fixed connection, or the second valve seat and the second valve body are an integral structure. The second valve needle spring, the second valve needle, the second adjusting spring, and the second adjusting limit block can be sequentially disposed within the inner cavity of the second valve body behind the second valve seat. The second valve seat is provided with a throttle valve hole. The pointed tip of the second valve needle is opposite to the valve opening of the throttle valve hole. The second valve needle spring is sleeved on the outside of the second valve needle. One end of the second valve needle spring is disposed on the second valve needle, and the other end is disposed on the second valve seat. The second adjusting spring is disposed between the second valve needle and the second adjusting limit block. One end of the second adjusting spring is disposed at the tail end or tail of the second valve needle, and the other end of the second adjusting spring is disposed at the front or front end of the second adjusting limit block. The second adjusting limit block and the inner wall of the second valve body are either threadedly connected, or connected by a threaded sleeve fixed to the inner wall of the second valve body, or connected by a rail sleeve fixed to the inner wall of the second valve body.

[0010] The second valve needle is axially movable. The second valve needle spring provides a thrust that causes the second valve needle to move away from the throttle valve orifice, and the second adjusting spring provides a preload that causes the second valve needle to move towards the throttle valve orifice. A gap is left between the second valve needle and the inner wall of the second valve body. The second valve needle is subjected to the elastic forces of the second valve needle spring and the second adjusting spring at the front and rear, respectively. Under the action of force, the second valve needle can move axially within the second valve body to close or open the flow area of ​​the second valve orifice.

[0011] A sealing component is provided at the first valve body interface at the rear end of the first adjusting limit block. A side interface is provided on the first valve seat or the first valve body after the valve port of the first valve seat, which is connected to the inner cavity of the first valve body. Two interfaces are provided in front of the first valve seat. The two interfaces in front of the first valve seat are either provided on the first valve body or connected to the front end of the first valve seat as a three-way pipe. The two interfaces in front of the first valve seat are two-way.

[0012] A sealing component is provided at the second valve body interface at the rear end of the second adjusting limit block. A side interface is provided on the second valve seat or the second valve body after the valve port of the second valve seat, which is connected to the inner cavity of the second valve body. Two interfaces are provided in front of the second valve seat. The two interfaces in front of the second valve seat are either provided on the second valve body or connected to the front end of the second valve seat as a three-way pipe. The two interfaces in front of the second valve seat are two-way.

[0013] One interface before the first valve seat is connected to the side interface after the valve port of the second valve seat, and the other interface before the first valve seat is the fluid inlet / outlet interface of the adjustable bidirectional adaptive throttle valve.

[0014] One interface before the second valve seat is connected to the side interface after the valve port of the first valve seat, and the other interface before the second valve seat is another fluid inlet / outlet interface of the adjustable bidirectional adaptive throttle valve.

[0015] A gap is left between the first valve needle and the inner wall of the first valve body, allowing the first valve needle to move axially within the first valve body.

[0016] A gap is left between the second valve needle and the inner wall of the second valve body, allowing the second valve needle to move axially within the second valve body.

[0017] The first valve body and the first valve seat may be an integral structure, the first valve seat is part of the first valve body, the first valve seat is located at one end of the first valve body, and the first valve seat is provided with a throttle valve orifice.

[0018] The second valve and the second valve seat can be an integral structure. The second valve seat is part of the second valve body. The second valve seat is located at one end of the second valve body and is provided with a throttle valve orifice.

[0019] The first valve seat may have one or more annular grooves, steps, or cylindrical cavities on one or both end faces. A throttle valve orifice is provided on the first valve seat, and one or more annular grooves may be provided on the outer surface of the first valve seat for easy roll-sealing and fixing. The first valve seat, first valve needle spring, first valve needle, first adjusting spring, and first adjusting limit block are sequentially arranged within the first valve body. To limit the first valve needle spring, the periphery of the valve port end of the first valve seat may extend along the axial direction, forming a cylindrical cavity or cylindrical opening as the valve seat cavity, in which part or all of the first valve needle spring may be placed. Steps may be provided within the cylindrical cavity or cylindrical opening.

[0020] The second valve seat may have one or more annular grooves, steps, or cylindrical cavities on one or both end faces. A throttling valve orifice is provided on the second valve seat, and one or more annular grooves may be provided on the outer surface of the second valve seat for easy roll-sealing and fixing. The second valve seat, second valve needle spring, second valve needle, second adjusting spring, and second adjusting limit block are sequentially arranged within the second valve body. To limit the second valve needle spring, the periphery of the valve port end of the second valve seat may extend along the axial direction, forming a cylindrical cavity or cylindrical opening as the valve seat cavity. Part or all of the second valve needle spring may be placed within this cavity or opening, and steps may be provided within the cylindrical cavity or opening.

[0021] One or both end faces of the first valve seat can be configured as a groove, a cylindrical opening, a recessed cavity, an annular groove, or a step; of course, it can also be configured as a plane.

[0022] The cylindrical space enclosed by the structure extending along the axial direction on the outer side of the valve seat at the valve port end of the first valve seat is the first valve seat cavity. A step or annular groove may be provided in the first valve seat cavity, and an annular cover plate may be provided at the valve seat cavity. One end of the first valve needle spring may be provided at the annular cover plate.

[0023] The valve seat end face may be provided with an annular bracket or annular ring for the first adjusting spring, which facilitates limiting the displacement of the adjusting spring.

[0024] The first valve needle spring is partially or entirely placed in the valve seat cavity of the first valve seat.

[0025] The first valve seat may also be a valve seat assembly comprising at least a first valve seat body and a first valve orifice core. The first valve orifice core is provided with a throttling valve orifice, and the first valve seat body is provided with a axial bore. The first valve orifice core is nested and fixed at the axial bore of the first valve seat body. The inlet and outlet of the throttling valve orifice channel of the first valve seat may be configured in a funnel shape to reduce the generation of flow eddies.

[0026] One or both end faces of the second valve seat can be configured as a groove, a cylindrical opening, a recessed cavity, an annular groove, or a step; of course, it can also be configured as a plane.

[0027] The cylindrical space enclosed by the structure extending along the axial direction on the outer side of the valve seat at the valve port end of the second valve seat is the second valve seat cavity. A step or annular groove may be provided in the second valve seat cavity, and an annular cover plate may be provided at the valve seat cavity. One end of the second valve needle spring may be provided at the annular cover plate.

[0028] The valve seat end face may be provided with an annular bracket or annular ring for the second adjusting spring, which facilitates limiting the displacement of the adjusting spring.

[0029] The second valve needle spring is partially or entirely placed in the valve seat cavity of the second valve seat.

[0030] The second valve seat can also be a valve seat assembly comprising at least a second valve seat body and a second valve orifice core. The second valve orifice core is provided with a throttle valve orifice, and the second valve seat body is provided with a axial bore. The second valve orifice core is nested and fixed in the axial bore of the second valve seat body. The inlet and outlet of the throttle valve orifice channel of the second valve seat can be configured in a funnel shape to reduce the generation of flow eddies.

[0031] The first valve needle spring is sleeved on the outside of the front section of the valve needle. One end of the first valve needle spring can be disposed on the outer wall of the first valve needle, at a step, or at an annular groove, 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.

[0032] To ensure the flatness of the end face of the first valve needle spring and maintain the coaxiality of the throttle valve orifice between the first valve needle and 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.

[0033] The first valve needle spring can be a flat-headed spring.

[0034] For simplicity, the first valve needle spring of the valve may not have transition smoothing rings at either end.

[0035] The outer surface of the first valve needle may be composed of the same or different rotating surfaces.

[0036] 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.

[0037] An annular groove can be provided at the step of the first valve needle, and one end of the first valve needle spring can be embedded in the annular groove.

[0038] An axial flow channel may be provided on or outside the first valve needle. Of course, an axial flow channel may not be provided on or outside the first valve needle.

[0039] The tail or end of the first valve needle may be provided with a step, an annular groove, a recess, or a cavity to facilitate the installation of the first adjusting spring.

[0040] In order to make the end face of the first adjusting spring flat and maintain the coaxiality of the first valve needle, transition smoothing rings can be provided at one or both ends of the first adjusting spring so that the first adjusting spring can be flatly set on the surface of the object it contacts.

[0041] The first adjusting spring can be a flat-headed spring.

[0042] For simplicity, the first adjusting spring may not have transition smoothing rings at either end.

[0043] The first adjusting spring has its two ends respectively disposed on the first valve needle and the first adjusting limit block. Both ends of the first adjusting 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.

[0044] The two ends of the first adjusting spring can be fixed to the first valve needle and the first adjusting limit block, respectively, which can effectively prevent the first valve needle from rotating.

[0045] An external thread can be provided on the outer side of the first adjusting limit block.

[0046] The front or front end of the first adjusting limit block may be provided with a step, a ring groove, a recess, or a cavity to facilitate the installation of the first adjusting spring. The tail of the first adjusting limit block is provided with a structure that is easy to screw and adjust, such as a slot, cross groove, internal hexagon or other internal polygonal structure, or a protruding polygonal boss / ring, adjusting rod, etc., which are easy to screw in and out with tools.

[0047] A pressure plate or pressure ring for fixing the first adjusting spring can be provided between the first adjusting spring and the first adjusting limit block. An annular step can be provided on the pressure plate or pressure ring, and the first adjusting limit block acts on the pressure plate or pressure ring.

[0048] The inner wall of one end of the first valve body may be provided with internal threads, and the first adjusting limit block is provided with external threads. The first adjusting limit block can be screwed in and out of the first valve body to adjust the tension of the first adjusting spring and the first valve needle spring, so as to achieve the optimal valve opening and closing capability of the first valve needle. A sealing ring may be provided at the contact point between the first adjusting limit block and the first valve body.

[0049] The first valve body may not have internal threads, but the first adjusting limit block has external threads. A threaded sleeve may be provided between the first valve body and the first adjusting limit block. The outer circumference of the threaded sleeve may have one or more annular grooves. The threaded sleeve is fixed to the inside of the valve body. The first adjusting limit block can be screwed in and out to adjust the tension of the first adjusting spring and the first valve needle spring to achieve the optimal valve opening and closing capability of the first valve needle. A sealing ring may be provided at the contact point between the first adjusting limit block and the threaded sleeve.

[0050] An axial flow channel may be provided on or outside the first adjusting limit block; an axial flow channel may not be provided on or outside the first adjusting limit block.

[0051] The tail end or tail portion of the first valve needle may be provided with a cavity, and a step may be provided in the cavity. The front part of the first adjusting limit block may also be provided with one or more steps or annular grooves. At least one step on the first adjusting limit block has an equivalent diameter greater than the inner diameter of the first adjusting spring.

[0052] The first adjusting spring and the front section of the first adjusting limit block can be placed into the cavity at the tail end or tail of the first valve needle. A rigid ball can be provided between the bottom of the first adjusting spring and the tail end or tail cavity of the first valve needle to maintain the balance of the first adjusting spring. Alternatively, the rigid ball can be omitted. The first adjusting spring can be sleeved on the front section of the first adjusting limit block and stop at a step on the first adjusting limit block. The equivalent diameter of the step is larger than the inner diameter of the first adjusting spring, which can block and compress the first adjusting spring.

[0053] The first valve needle, the first adjusting spring, and the first adjusting limit block can form a first adjusting valve needle assembly. The first adjusting valve needle assembly can also be an assembly with the first valve needle spring. The edge of the cavity at the tail end or tail of the first valve needle can also be narrowed or a ring or semi-ring retaining ring can be used to restrict the sliding out of the first adjusting spring and the insertion part of the first adjusting limit block.

[0054] The front end or front part of the first adjusting limit block can also be configured as a cavity, and a step can be provided in the cavity. The rear section of the first valve needle can be provided with one or more steps or annular grooves or a thin rod. At least one step on the first valve needle has an equivalent diameter greater than the inner diameter of the first adjusting spring.

[0055] The first adjusting spring and the tail of the first valve needle can be placed into the cavity at the front end or front of the first adjusting limit block. A rigid ball can be set between the bottom of the cavity at the front end or front of the first adjusting spring and the first adjusting limit block to maintain the balance of the first adjusting spring. Alternatively, the rigid ball can be omitted. The first adjusting spring can be sleeved on the outside of the rear section of the first valve needle and stop at a step on the rear section of the first valve needle. The equivalent diameter of the step is larger than the inner diameter of the adjusting spring, which can block and compress the first adjusting spring.

[0056] The first valve needle, the first adjusting spring, and the first adjusting limiting block can form a first adjusting valve needle assembly. The first adjusting valve needle assembly can also be an assembly with the first valve needle spring added. The front end or front cavity edge of the first adjusting limiting block can also be narrowed or a ring or semi-ring retaining ring can be used to restrict the sliding out of the first adjusting spring and the rear insertion part of the first valve needle.

[0057] The first adjusting limit block may have a step at its front end, and the front end or front part of the first adjusting limit block may also be a thin rod. The rear end of the first valve needle may have one or more steps or annular grooves. The tail end of the first valve needle may have a hole. The thin rod at the front end or front part of the first adjusting limit block may be inserted into the hole at the tail end of the first valve needle. The first adjusting spring is sleeved on the outer side of the rear end of the first valve needle and the front end or front part of the first adjusting limit block. The two ends of the first adjusting spring are respectively set on the outer side of the rear end of the first valve needle and the front end or front part of the first adjusting limit block, which also constitutes the first adjusting valve needle assembly. The first adjusting valve needle assembly may also be an assembly with the first valve needle spring.

[0058] The first adjusting limit block may have a step at its front end and a hole at its front end. The first valve needle may have one or more steps or annular grooves at its rear end and a thin rod at its tail end. The thin rod at the tail end of the first valve needle may be inserted into the hole at the front end of the first adjusting limit block. The first adjusting spring is sleeved on the outer side of the rear end of the first valve needle and the front end or front part of the first adjusting limit block. The two ends of the first adjusting spring are respectively located on the outer side of the rear end of the first valve needle and the front end or front part of the first adjusting limit block, which also constitutes the first adjusting valve needle assembly. The first adjusting valve needle assembly may also be an assembly with the first valve needle spring.

[0059] The first adjusting limit block is provided with an annular groove to facilitate the installation of a sealing ring.

[0060] A sealing ring can be provided between the first adjusting limit block and the inner wall of the first valve body to prevent fluid leakage when adjusting the first adjusting limit block. The end of the first valve body near the first adjusting limit block can be sealed with a sealing component to facilitate easy removal and adjustment of the first adjusting limit block. The sealing component may be detachable or non-detachable.

[0061] A connecting adjustment rod may be provided at the rear end or rear part of the first adjusting limit block. The adjustment rod may be hidden inside the sealing component or exposed outside the sealing component. The adjustment rod passes through the sealing component, and the two can be sealed by a sealing device. The end of the adjustment rod is shaped to be suitable for turning with a tool, and an adjustment handle may also be added to the end of the adjustment rod for easy turning by hand or tool.

[0062] The first adjusting limit block has a rail groove or slide rail on its outer side. The inner wall of the first valve body or the first valve body has a rail sleeve that adapts to the slide rail or rail groove on the outer side of the first adjusting limit block. The first adjusting limit block slides axially within the first valve body or the first valve body. An adjusting knob and a knob sleeve can be provided within the first valve body or the first valve body behind the first adjusting limit block. The rear end of the first adjusting limit block can also have an internal threaded hole. The adjusting knob has a push rod with external threads. The adjusting knob push rod can be screwed into the internal thread at the rear end of the adjusting limit block to adjust the movement of the first adjusting limit block. The adjusting knob... A knob sleeve is fixed to the first valve body or the inner wall of the first valve body. The knob sleeve restricts the axial movement of the adjusting knob, and the adjusting knob can rotate. A sealing measure is provided between the adjusting knob and the knob sleeve. Alternatively, a protruding rod-shaped object can be provided at the rear end of the first adjusting limit block, and an external thread is provided on the rod-shaped object. An internal threaded hole is provided at the front end of the adjusting knob. The externally threaded rod-shaped object at the rear end of the first adjusting limit block can be screwed into the internal thread of the adjusting knob top rod to adjust the movement of the first adjusting limit block. A structure for screwing with tools is provided at the rear end of the adjusting knob for convenient adjustment. A sealing device is provided between the adjusting rod and the sealing component.

[0063] To prevent the first valve needle from rotating or colliding with the first valve body, one or more axial guide rail grooves or guide rail holes may be provided on the first valve needle, and one or more guide rails may be provided in the first valve body. The guide rails pass through the guide rail grooves or guide rail holes on the first valve needle. One end of the guide rail or both ends may be fixed. The guide rails may be fixed on the first valve seat, the inner wall of the valve body, the threaded sleeve, or the first adjusting limit block.

[0064] To prevent the first valve needle from rotating, a stop rod to prevent the first valve needle from rotating may also be provided on the outer edge or outside of the first valve needle.

[0065] The second valve needle spring is sleeved on the outside of the front section of the valve needle. One end of the second valve needle spring can be located on the outer wall of the second valve needle, at a step, or in an annular groove, 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.

[0066] To ensure the second valve needle spring end face is flat and maintain the coaxiality of the second valve needle and the throttle valve orifice on 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.

[0067] The second valve needle spring can be a flat-headed spring.

[0068] For simplicity, the second valve needle spring can be without transition smoothing rings at both ends.

[0069] 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.

[0070] An annular groove can be provided at the step of the second valve needle, and one end of the second valve needle spring can be embedded in the annular groove.

[0071] An axial flow channel may be provided on or outside the second valve needle. Of course, an axial flow channel may not be provided on or outside the second valve needle.

[0072] The tail or end of the second valve needle may be provided with a step, an annular groove, a recess, or a cavity to facilitate the installation of the second adjusting spring.

[0073] In order to make the end face of the second adjusting spring flat and maintain the coaxiality of the second valve needle, transition smoothing rings can be provided at one or both ends of the second adjusting spring so that the second adjusting spring can be flatly set on the surface of the object it contacts.

[0074] The second adjusting spring can be a flat-headed spring.

[0075] For simplicity, the second adjusting spring may not have transition smoothing rings at either end.

[0076] The two ends of the second adjusting spring are respectively disposed on the second valve needle and the second adjusting limit block. Both ends of the second adjusting spring can be fixed on the contact surface, or one end can be fixed while the other end is not fixed, or neither end can be fixed.

[0077] The two ends of the second adjusting spring can be fixed to the second valve needle and the second adjusting limit block respectively, which can effectively prevent the second valve needle from rotating.

[0078] An external thread can be provided on the outer side of the second adjusting limit block.

[0079] The front or front end of the second adjustment limit block may be provided with a step, a ring groove, a recess, or a cavity to facilitate the installation of the second adjustment spring. The tail end of the second adjustment limit block is provided with a structure that is easy to screw and adjust, such as a slot, cross groove, internal hexagon or other internal polygonal structure, or a protruding polygonal boss / ring, adjustment rod, etc., which are easy to screw in and out with tools.

[0080] A pressure plate or pressure ring for fixing the second adjusting spring can be provided between the second adjusting spring and the second adjusting limit block. An annular step can be provided on the pressure plate or pressure ring, and the second adjusting limit block acts on the pressure plate or pressure ring.

[0081] The inner wall of one end of the second valve body may be provided with internal threads, and the second adjusting limit block is provided with external threads. The second adjusting limit block can be screwed in and out of the second valve body to adjust the tension of the second adjusting spring and the second valve needle spring, so as to achieve the optimal valve opening and closing capability of the second valve needle. A sealing ring may be provided at the contact point between the second adjusting limit block and the second valve body.

[0082] The second valve body may not have internal threads, but the second adjusting limit block has external threads. A threaded sleeve can be provided between the second valve body and the second adjusting limit block. The outer circumference of the threaded sleeve can have one or more annular grooves. The threaded sleeve is fixed to the inside of the valve body. The second adjusting limit block can be screwed in and out to adjust the tension of the second adjusting spring and the second valve needle spring to achieve the optimal valve opening and closing capability of the second valve needle. A sealing ring can be provided at the contact point between the second adjusting limit block and the threaded sleeve.

[0083] An axial flow channel may be provided on or outside the second adjusting limit block; an axial flow channel may not be provided on or outside the second adjusting limit block.

[0084] The tail end or tail portion of the second valve needle may be provided with a cavity, and a step may be provided in the cavity. The front part of the second adjusting limit block may also be provided with one or more steps, annular grooves, or thin rods. At least one step on the second adjusting limit block has an equivalent diameter greater than the inner diameter of the second adjusting spring.

[0085] The front section of the second adjusting spring and the second adjusting limit block can be placed into the cavity of the tail end or tail of the second valve needle. A rigid ball can be set between the bottom of the second adjusting spring and the tail end or tail cavity of the second valve needle to maintain the balance of the second adjusting spring. Alternatively, the rigid ball can be omitted. The front section of the second adjusting spring can be sleeved on the second adjusting limit block and stop at a step on the second adjusting limit block. The equivalent diameter of the step is larger than the inner diameter of the second adjusting spring, which can block and compress the second adjusting spring.

[0086] The second valve needle, the second adjusting spring, and the second adjusting limit block can form a second adjusting valve needle assembly. The second adjusting valve needle assembly can also be an assembly with the second valve needle spring. The edge of the cavity at the tail end or tail of the second valve needle can also be narrowed or a ring or semi-ring retainer can be used to restrict the sliding out of the second adjusting spring and the second adjusting limit block insertion part.

[0087] The front end or front part of the second adjusting limit block can also be configured as a cavity, and a step can be provided in the cavity. The rear section of the second valve needle can be provided with one or more steps or annular grooves. At least one step on the second valve needle has an equivalent diameter greater than the inner diameter of the second adjusting spring.

[0088] The second adjusting spring and the tail of the second valve needle can be placed into the cavity at the front end or front of the second adjusting limit block. A rigid ball can be set between the bottom of the cavity at the front end or front of the second adjusting spring and the second adjusting limit block to maintain the balance of the second adjusting spring. Alternatively, the rigid ball can be omitted. The second adjusting spring can be sleeved on the outside of the rear section of the second valve needle and stop at a step on the rear section of the second valve needle. The equivalent diameter of the step is larger than the inner diameter of the adjusting spring, which can block and compress the second adjusting spring.

[0089] The second valve needle, the second adjusting spring, and the second adjusting limiting block can form a second adjusting valve needle assembly. The second adjusting valve needle assembly can also be an assembly with the second valve needle spring. The front end or front cavity edge of the second adjusting limiting block can also be narrowed or a ring or semi-ring retaining ring can be used to restrict the sliding out of the second adjusting spring and the rear part of the second valve needle.

[0090] The second adjusting limit block may have a step at its front end, and the front end or front part of the second adjusting limit block may also be a thin rod. The second valve needle may have one or more steps or annular grooves at its rear end, and a hole may be provided at the tail end of the second valve needle. The thin rod at the front end or front part of the second adjusting limit block may be inserted into the hole at the tail end of the second valve needle. The second adjusting spring is sleeved on the outer side of the rear end of the second valve needle and the front end or front part of the second adjusting limit block. The two ends of the second adjusting spring are respectively provided on the outer side of the rear end of the second valve needle and the front end or front part of the second adjusting limit block, forming a second adjusting valve needle assembly. The second adjusting valve needle assembly may also be an assembly with the second valve needle spring.

[0091] The front section of the second adjusting limit block may be provided with a step, and the front end of the second adjusting limit block may also be provided with a hole. The rear section of the second valve needle may be provided with one or more steps or annular grooves. The tail section of the second valve needle may be provided with a thin rod, which can be inserted into the hole at the front end of the second adjusting limit block. The second adjusting spring is sleeved on the outer side of the rear section of the second valve needle and the front or front part of the second adjusting limit block. The two ends of the second adjusting spring are respectively provided on the outer side of the rear section of the second valve needle and the front or front part of the second adjusting limit block, forming a second adjusting valve needle assembly. The second adjusting valve needle assembly may also be an assembly provided with the second valve needle spring.

[0092] The second adjusting limit block is provided with an annular groove to facilitate the installation of a sealing ring.

[0093] A sealing ring can be provided between the second adjusting limit block and the inner wall of the second valve body to prevent fluid leakage when adjusting the second adjusting limit block. The end of the second valve body near the second adjusting limit block can be sealed with a sealing component to facilitate easy removal and adjustment of the second adjusting limit block. The sealing component may be detachable or non-detachable.

[0094] A connecting adjustment rod may be provided at the rear end or rear part of the second adjusting limit block. The adjustment rod may be hidden inside the sealing component or exposed outside the sealing component. The adjustment rod passes through the sealing component, and the two can be sealed by a sealing device. The end of the adjustment rod is shaped to be suitable for turning with a tool, and an adjustment handle may also be added to the end of the adjustment rod for easy turning by hand or tool.

[0095] The second adjusting limit block has a rail groove or slide rail on its outer side. The inner wall of the second valve body or the second valve body is provided with a rail sleeve that adapts to the slide rail or rail groove on the outer side of the second adjusting limit block. The second adjusting limit block slides axially within the second valve body or the second valve body. An adjusting knob and a knob sleeve can be provided within the second valve body or the second valve body behind the second adjusting limit block. The rear end of the second adjusting limit block can also have an internal threaded hole. The adjusting knob is provided with a push rod, which has an external thread. The adjusting knob push rod can be screwed into the internal thread at the rear end of the adjusting limit block to adjust the movement of the second adjusting limit block. The adjusting knob... A knob sleeve is fixed to the inner wall of the second valve body or the second valve body. The knob sleeve restricts the axial movement of the adjusting knob, and the adjusting knob can rotate. A sealing measure is provided between the adjusting knob and the knob sleeve. Alternatively, a protruding rod-shaped object can be provided at the rear end of the second adjusting limit block, and an external thread is provided on the rod-shaped object. An internal threaded hole is provided at the front end of the adjusting knob. The external threaded rod-shaped object at the rear end of the second adjusting limit block can be screwed into the internal thread of the adjusting knob top rod to adjust the movement of the second adjusting limit block. A structure for screwing with tools is provided at the rear end of the adjusting knob for convenient adjustment. A sealing device is provided between the adjusting rod and the sealing component.

[0096] To prevent the second valve needle from rotating or colliding with the second valve body, one or more axial guide rail grooves or guide rail holes may be provided on the second valve needle, and one or more guide rails may be provided in the second valve body. The guide rails pass through the guide rail grooves or guide rail holes on the second valve needle. One end of the guide rail or both ends may be fixed. The guide rails may be fixed on the second valve seat, the inner wall of the valve body, the threaded sleeve, or the second adjusting limit block.

[0097] To prevent the second valve needle from rotating, a stop rod to prevent the second valve needle from rotating may also be provided on the outer edge or outside of the second valve needle.

[0098] A filter screen can be installed in one or both interface channels of the adjustable bidirectional adaptive throttle valve.

[0099] To prevent fluid leakage, sealing devices can be provided at all moving parts associated with the outside of the adjustable bidirectional adaptive throttle valve.

[0100] A filter screen can be installed in one or both interface channels of the adjustable bidirectional adaptive throttle valve.

[0101] The second aspect of this utility model proposes an adjustable bidirectional adaptive throttling refrigeration device, the adjustable bidirectional adaptive throttling refrigeration device comprising: an adjustable bidirectional adaptive throttling valve structure as described in any of the above technical solutions.

[0102] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model is used as an adjustable bidirectional adaptive throttle valve to achieve adjustable bidirectional variable flow throttling. When the fluid flows from the inlet of the adjustable bidirectional adaptive throttle valve through the throttle valve hole on the first valve seat or valve seat assembly, the throttle valve hole on the second valve seat or valve seat assembly is closed. As the flow rate or pressure difference of the incoming fluid increases, the thrust of the fluid on the first valve needle will also increase, the original balance force of the first valve needle is broken, the first valve needle moves, the first adjusting spring is further compressed, and the valve opening is widened. Under the action of the first valve needle spring, the first adjusting 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 is compressed, the first valve needle moves in the opposite direction, and the valve opening is narrowed. Under the action of the first valve needle spring, the first adjusting spring and the fluid pressure, the force on the first valve needle is rebalanced. In reverse flow, the fluid enters from another interface, the throttling valve orifice on the second valve seat or valve seat assembly opens, and the throttling valve orifice on the first valve seat or valve seat assembly closes. After being throttled by the valve orifice on the second valve seat or valve seat assembly, the fluid flows out, enabling adaptive throttling under bidirectional variable flow rate or variable pressure difference conditions. Furthermore, when the operating conditions of the refrigeration system differ significantly (such as air conditioning conditions and low-temperature conditions) or when the refrigerant is different, the system pressure will vary considerably. In this case, the pre-pressure of the first valve needle spring, the first adjusting spring, the second valve needle spring, and the second adjusting spring can be adjusted by regulating the first and second adjusting positioning blocks to meet the pressure requirements of different operating conditions or refrigerants, thus achieving adjustable bidirectional adaptive throttling.

[0103] Furthermore, the damping effect of the compressed valve needle spring and the compressed adjusting spring reduces the oscillation of the throttling flow caused by pressure fluctuations, thus reducing noise generated by valve needle vibration. 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 the valve needle minimizes displacement of moving parts and valve needle oscillation, mechanical collision noise can be virtually eliminated. This results in high reliability, eliminates the need for complex control strategies, reduces the unit's failure rate, simplifies and improves the reliability of the refrigeration unit, reduces costs, and facilitates maintenance and replacement. Ultimately, this simplifies the control of the throttling mechanism and automates simple problems. Attached Figure Description

[0104] 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.

[0105] Figure 1 This is a schematic diagram of an adjustable bidirectional adaptive throttle valve.

[0106] Figure 2 This is another structural diagram of an adjustable bidirectional adaptive throttle valve.

[0107] Among them, 1-first adjusting limit block, 2-first adjusting spring, 3-first valve needle, 4-first valve needle spring, 5-first valve seat, 6-connecting pipe, 7-first valve body, 8-second adjusting limit block, 9-second adjusting spring, 10-second valve needle, 11-second valve needle spring, 12-second valve seat, 13-connecting pipe, 14-second valve body, 15-sealing component, 16-sealing component, 17-first valve seat, 18-first valve body, 19-first valve needle spring, 20-first valve needle, 21-first adjusting spring, 22-first adjusting limit block, 23-sealing component, 24-second valve seat, 25-second valve body, 26-second valve needle spring, 27-second valve needle, 28-second adjusting spring, 29-second adjusting limit block, 30-sealing component, 31-interface, 32-interface, 33-connecting pipe, 34-connecting pipe. Detailed Implementation

[0108] 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.

[0109] Example 1

[0110] like Figure 1 As shown in the diagram, this embodiment provides a structural schematic of an adjustable bidirectional adaptive throttle valve. It can be implemented as follows:

[0111] The first adjusting limit block 1, the first adjusting spring 2, the first valve needle 3, the first valve needle spring 4, the first valve seat 5, the connecting pipe 6, the first valve body 7, the second adjusting limit block 8, the second adjusting spring 9, the second valve needle 10, the second valve needle spring 11, the second valve seat 12, the connecting pipe 13, the second valve body 14, the sealing component 15, and the sealing component 16 are pre-processed.

[0112] Then assemble the processed components together: First, assemble the first valve seat 5 and the first valve body 7 by rolling and fixing them to form the first valve body assembly; assemble the first valve needle assembly: place the first adjusting spring 2 into the rear cavity of the first valve needle 3, then insert the front section of the first adjusting limit block 1 and set the retaining ring, then put the threaded sleeve on the outside of the first adjusting limit block 1, then put the first valve needle spring 4 on the prepared first valve needle assembly and then put it into the assembled first valve body assembly, then use a tooling to position the threaded sleeve and fix it to the inner wall of the valve body 7; assemble the second valve seat 12 and the second valve body 14. The second valve body is assembled by pressing and fixing the rollers together. The second valve needle assembly is then assembled: the second adjusting spring 9 is placed into the rear cavity of the second valve needle 10, the front section of the second adjusting limit block 8 is inserted and a retaining ring is installed, a threaded sleeve is then fitted onto the outside of the second adjusting limit block 8, the second valve needle spring 11 is fitted onto the prepared second valve needle assembly, and then placed into the assembled second valve body. The threaded sleeve is then positioned using a tooling fixture and fixed to the inner wall of the valve body 14. The relevant interfaces of the two valve bodies are then welded together using connecting pipes 6 and 13 to form a single unit. Finally, sealing components 15 and 16 are installed. After assembly, the first adjusting limit block 1 and the second adjusting limit block 8 can be adjusted to position the first valve needle 3 and the second valve needle 10 appropriately. After installation on the refrigeration equipment, depending on the system operating status, the refrigerant fluid can enter the first valve seat 5 throttling valve orifice from the first valve seat 5 end of the first valve body, where it is throttled, while the second valve seat 12 valve orifice is closed. The fluid then flows out of the throttling valve from the second valve body 14 via connecting pipe 13. Conversely, after the flow enters the throttle valve orifice of the second valve seat 12 from the second valve body, the valve orifice of the first valve seat 5 is closed, and then flows out of the throttle valve from the first valve body 7 through the connecting pipe 6.

[0113] Example 2

[0114] like Figure 2 As shown in the diagram, this embodiment provides another structural schematic of an adjustable bidirectional adaptive throttle valve. It can be implemented as follows:

[0115] The first valve seat 17, the first valve body 18, the first valve needle spring 19, the first valve needle 20, the first adjusting spring 21, the first adjusting limit block 22, the sealing component 23, the second valve seat 24, the second valve body 25, the second valve needle spring 26, the second valve needle 27, the second adjusting spring 28, the second adjusting limit block 29, the sealing component 30, the interface 31, the interface 32, the connecting pipe 33, and the connecting pipe 34 are pre-processed.

[0116] Then assemble the processed components together: First, assemble and roll-press the first valve seat 17 and the first valve body 18 to form the first valve body assembly, and then weld and install the tee pipe at the front end of the first valve seat 17; Assemble the first valve needle assembly: Place the first adjusting spring 21 into the rear cavity of the first valve needle 20, then insert the front section of the first adjusting limit block 22 and set the retaining ring, then put the first valve needle spring 19 on the prepared first valve needle assembly and place it into the assembled first valve body assembly, and use a tool to adjust the thread and rotate the first adjusting limit block 22 to the appropriate position; Assemble and roll-press the second valve seat 24 and the second valve body 25 to form the second valve body assembly, and then weld and install the tee pipe at the front end of the second valve seat 24. Connect the pipe; assemble the second valve needle assembly: place the second adjusting spring 28 into the rear cavity of the second valve needle 27, then insert the front section of the second adjusting limit block 29 and set the retaining ring. Next, put the second valve needle spring 26 on the prepared second valve needle assembly and place it into the assembled second valve body assembly. Then, use a tool to adjust the thread and rotate the second adjusting limit block 29 to the appropriate position. Then, use connecting pipes 33 and 34 to weld the relevant interfaces of the two valve bodies together into a whole. Finally, install the sealing component 23 and sealing component 30 respectively. After assembly, you can use a tool to adjust the first adjusting limit block 22 and the second limit block 29 respectively to make the first valve needle 20 and the second valve needle 27 respectively to the appropriate positions. After installation on the refrigeration equipment, according to the system operating status, the refrigerant fluid can enter the first valve seat 17 throttling valve orifice from the front end interface 32 of the first valve body and be throttled, while the valve orifice of the second valve seat 24 is closed. Then, it flows out of the throttling valve from the front end interface 31 of the second valve seat 24 through the connecting pipe 34. Conversely, after the flow enters the throttle valve orifice of the second valve seat 24 through the front end interface 31 of the second valve seat 24 and is throttled, the valve orifice of the first valve seat 17 is closed, and then flows out of the throttle valve through the front end interface 32 of the first valve seat 17 via the connecting pipe 33.

[0117] The above provides a detailed description of two implementation schemes for the adaptive throttle valve and expansion valve provided by this utility model. Two specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of ​​this utility model.

[0118] It should be further clarified that although the listed application implementation schemes are all designed for the refrigeration field, this utility model proposes an adaptive throttling valve and its components that can be applied to the field of fluid flow control as a flow regulating valve. The throttling mentioned here is actually the control of fluid flow rate. Different equipment and different application scenarios will have different requirements for the control of fluid flow rate, and the throttling valve orifice, valve needle, and other components can be optimized according to different application scenarios and equipment.

[0119] 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.

[0120] 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.

[0121] 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, tail segment, end section", "front end, rear end, upper end, lower end, end, before, after", "longitudinal, transverse" and "upper part, lower part, side, bottom surface, front, back, left, right, first, second", etc., indicating the orientation, position or sequence relationship, are usually based on the orientation or position relationship shown in the accompanying drawings, and 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.

[0122] Furthermore, it should be noted that the use of words such as "first," "then," "again," "first," and "second" to limit the processing order 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.

[0123] 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.

[0124] 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. An adjustable bidirectional adaptive throttle valve, comprising at least a first valve body, a second valve body, a first valve seat, a first valve needle, a first valve needle spring, a first adjusting spring, a first adjusting limit block, a second valve seat, a second valve needle, a second valve needle spring, a second adjusting spring, and a second adjusting limit block, characterized in that: The first valve seat is wholly or partially disposed within the first valve body, or the front portion of the first valve body is inserted into and fixedly connected to the first valve seat, or the first valve seat and the first valve body are an integral structure. The first valve needle spring, the first valve needle, the first adjusting spring, and the first adjusting limit block are disposed within the inner cavity of the first valve body behind the first valve seat. The first valve seat has a throttle valve orifice. The pointed tip of the first valve needle faces the valve opening of the throttle valve orifice. The first valve needle spring is sleeved on the outside of the first valve needle, with one end of the first valve needle spring disposed on the first valve needle and the other end disposed on the first valve seat or valve seat cover. The first adjusting spring is disposed between the first valve needle and the first adjusting limit block. One end of the spring is located at the tail end or tail of the first valve needle, and the other end of the first adjusting spring is located at the front or front end of the first adjusting limit block. The first adjusting limit block and the inner wall of the first valve body are either threaded together, threaded together through a threaded sleeve fixed to the inner wall of the first valve body, or connected through a rail sleeve fixed to the inner wall of the first valve body. The second valve seat is wholly or partially disposed within the second valve body, or the front part of the second valve body is inserted into the second valve seat for fixed connection, or the second valve seat and the second valve body are an integral structure. The second valve needle spring, the second valve needle, the second adjusting spring, and the second adjusting limit block are disposed within the inner cavity of the second valve body behind the second valve seat. The second valve seat is provided with a section. A flow valve orifice is provided, with the pointed tip of the second valve needle facing the valve port of the throttle valve orifice. A second valve needle spring is sleeved on the outside of the second valve needle, with one end of the spring resting on the second valve needle and the other end on the second valve seat or valve seat cover. A second adjusting spring is positioned between the second valve needle and the second adjusting limit block, with one end at the tail end or tail portion of the second valve needle and the other end at the front or front end of the second adjusting limit block. The second adjusting limit block and the inner wall of the second valve body are connected either by a threaded connection, a threaded connection through a threaded sleeve fixed to the inner wall of the second valve body, or a connection through a rail sleeve fixed to the inner wall of the second valve body. A sealing component is provided at the first valve body interface at the rear end of the first adjusting limit block. A side interface is provided on the first valve seat or the first valve body after the valve port of the first valve seat. Two interfaces are provided before the first valve seat, and the two interfaces before the first valve seat are interconnected. A sealing component is provided at the second valve body interface at the rear end of the second adjusting limit block. A side interface is provided on the second valve seat or the second valve body after the valve port of the second valve seat. Two interfaces are provided before the second valve seat, and the two interfaces before the second valve seat are interconnected. One interface before the first valve seat communicates with the side interface after the valve port of the second valve seat. The other interface before the first valve seat is the fluid inlet / outlet interface of the adjustable bidirectional adaptive throttle valve.One port before the second valve seat communicates with the side port after the first valve seat port, and the other port before the second valve seat is another fluid inlet / outlet port of the adjustable bidirectional adaptive throttle valve.

2. The adjustable bidirectional adaptive throttle valve according to claim 1, characterized in that, The two ports before the first valve seat are either located on the first valve body or connected to a tee pipe at the front end of the first valve seat.

3. The adjustable bidirectional adaptive throttle valve according to claim 1, characterized in that, The two ports before the second valve seat are either located on the second valve body or connected to a tee pipe at the front end of the second valve seat.

4. The adjustable bidirectional adaptive throttle valve according to claim 1, characterized in that, The front end or front part of the first adjusting limit block is set as a step, an annular groove, a cavity, or a thin rod, and the rear section of the first valve needle is set as a step, an annular groove, a cavity, or a thin rod.

5. The adjustable bidirectional adaptive throttle valve according to claim 1, characterized in that, The front end or front part of the second adjusting limit block is set as a step, an annular groove, a cavity, or a thin rod, and the rear part of the second valve needle is set as a step, an annular groove, a cavity, or a thin rod.

6. The adjustable bidirectional adaptive throttle valve according to claim 1, characterized in that, A sealing ring is provided between the first adjusting limit block and the inner wall of the first valve body, and a sealing ring is provided between the second adjusting limit block and the inner wall of the second valve body.

7. The adjustable bidirectional adaptive throttle valve according to claim 1, characterized in that, An adjustment rod may be provided at the rear end or rear part of the first adjustment limit block.

8. The adjustable bidirectional adaptive throttle valve according to claim 1, characterized in that, An adjustment rod may be provided at the rear end or rear part of the second adjustment limit block.

9. The adjustable bidirectional adaptive throttle valve according to claim 1, characterized in that, An adjustable bidirectional adaptive throttle valve has a filter screen installed in one or both of its ports.

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

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