Adaptive expansion valve and its components

Abstract

An adaptive expansion valve includes at least a valve body, a valve needle, a valve needle spring, an adjusting spring, and an adjusting limit block. The valve body is an integrated structural component provided with a valve seat or an assembly including at least a valve seat and a tubular component. One end of the valve needle spring is provided on the valve needle, and the other end is provided on the valve seat. The adjusting spring is provided between the valve needle and the adjusting limit block. The adjusting limit block is used to adjust the initial position of the valve needle. The valve needle can move axially in the valve body under the action of force to close or open the flow area of ​​the valve port. The adaptive expansion valve of the present invention uses variable flow throttling. When the fluid passes through the throttling valve hole on the valve seat, the valve port is opened or closed under the dynamic action of the valve needle spring, the adjusting spring, and the fluid pressure as the flow rate of the incoming fluid changes, and the force on the valve needle will be rebalanced. In addition, due to the damping effect of the springs at both ends of the valve needle, the valve needle oscillates less, reduces noise, and has high reliability, which can simplify the control problem of the throttling mechanism and automate simple problems.

Description

Technical Field

[0001] The invention relates to the fields of fluid flow control and refrigeration technology, and relates to a throttling mechanism, in particular to an adaptive expansion valve and an adaptive expansion valve assembly. Background Art

[0002] In the prior art, the throttling device between the evaporator and the condenser of the refrigeration equipment is generally an adjustable flow element and an unadjustable flow element. The adjustable flow element is such as an electronic expansion valve, and the unadjustable flow element is such as a capillary tube, a throttling tube (valve). The current adjustable flow element has a high cost, especially the electronic expansion valve needs to be equipped with a corresponding control strategy, and it is easy to get stuck and has low reliability. The throttling method of the unadjustable flow element can only provide a throttling effect of a fixed length or a fixed opening, and the throttling effect cannot be adjusted according to the flow rate and the pressure changes on both sides. The adaptability of the throttling condition is poor, but the cost is low, and it is still widely used in refrigeration equipment. However, in the air-conditioning system where the throttling valve is used as the throttling device, the throttling valve changes the throttling direction by the conversion of the high and low pressures of the system. However, in actual use, the valve needle of the throttling valve will get stuck, affecting the normal operation of the air conditioner. In addition, the valve needle of the throttling valve is prone to vibration during the axial movement, and eddy currents will be generated when the refrigerant flows through the throttling valve, thereby generating mechanical noise and flow noise. If the throttling effect of flow adaptability can be achieved on the throttling tube (valve), and variable flow adaptive throttling can be achieved, it can not only save material and manufacturing costs, but also save the cost of control strategy. Therefore, how to simplify the control problem of the throttling mechanism, automate simple problems, and how to achieve adaptive throttling of throttling valves with variable flow or under variable pressure, reduce noise, reduce failure rate, facilitate maintenance and replacement, and improve the reliability of equipment operation are the pursuits of industry engineers and researchers. Summary of the invention

[0003] In order to overcome the defects and shortcomings of the prior art, the present invention provides an adaptive expansion valve and an adaptive expansion valve assembly, which effectively solves the problem that the existing expansion valve cannot achieve adaptive throttling effect under variable flow or pressure difference, maintains the refrigeration effect, reduces the risk of jamming and noise, reduces noise, and effectively improves the reliability of refrigeration equipment operation. To this end, the present invention adopts the following technical solutions:

[0004] To this end, the first aspect of the present invention provides an adaptive expansion valve. The second aspect of the present invention provides an adaptive expansion valve assembly.

[0005] According to one aspect of the present invention, the following technical solution is used:

[0006] Provided is an adaptive expansion valve, comprising at least a valve body, a valve needle, a valve needle spring, an adjusting spring and an adjusting limit block, wherein the valve body is an integrated component provided with a valve seat or a combined structure comprising at least a valve seat or a valve seat assembly and a tubular component, the valve needle spring, the valve needle, the adjusting spring and the adjusting limit block can be sequentially arranged in the inner cavity of the valve body behind the valve seat or the valve seat assembly, the valve seat or the valve seat assembly is provided with a throttle valve hole, the front end of the valve needle is opposite to the valve port of the throttle valve hole, the valve needle spring is sleeved on the outer side of the front section of the valve needle, one end of the valve needle spring is arranged on the valve needle, and the other end is arranged on the valve seat or the valve seat assembly, and the adjusting spring is arranged on Between the valve needle and the regulating stop block, one end of the regulating spring is arranged at the tail end or tail of the valve needle, and the other end of the regulating spring is arranged at the front or front end of the regulating stop block. The regulating stop block and the inner wall of the valve body are either threadedly connected or threadedly connected between the thread sleeves fixed on the inner wall of the valve body or connected by the rail sleeves fixed on the inner wall of the valve body, or the regulating stop block is fixed to the inner wall of the valve body. The valve needle can move axially. The front end of the valve needle is a needle thin part. The valve needle spring provides a thrust to make the valve needle move away from the movement trend of the throttle valve hole, and the regulating spring provides a pre-tightening force to make the valve needle move toward the movement trend of the throttle valve hole. A gap is left between the valve needle and the inner wall of the valve body. The valve needle is respectively acted on by the elastic force of the valve needle spring and the regulating spring. The valve needle can move axially in the valve body under the action of force to close or open the flow area of ​​the valve port.

[0007] The adaptive expansion valve is provided with at least two interfaces, which are fluid inlet and outlet channels, one interface is connected to the throttle valve hole channel, and the other interface is connected to the inner cavity of the valve body. The interfaces can be both arranged on the side of the valve body, or both arranged in the axial direction of the valve body, or one interface can be arranged on the side of the valve body and the other interface can be arranged in the axial direction of the valve body. The interface can be connected to the fluid delivery pipeline by welding or threaded connection.

[0008] The valve body may be an integrated structure, the valve seat is a part of the valve body, the valve seat is arranged at one end of the valve body, the valve seat is provided with a throttle valve hole, and the throttle valve hole is connected to an interface of the adaptive expansion valve.

[0009] The valve body may also be a combined structure, including at least two independent parts, a valve seat or valve seat assembly and a tubular member, which are then combined together to form the valve body. One or more annular grooves, steps or cylindrical cavities may be provided on the two end faces or one end face of the valve seat or valve seat assembly. A throttle valve hole is provided on the valve seat or valve seat assembly, and one or more annular grooves may be provided on the outer side of the valve seat or valve seat assembly to facilitate rolling sealing and fixing. The valve seat or valve seat assembly is arranged at one end of the tubular member to form the valve body, or the valve seat or valve seat assembly is partially or completely inserted into one end of the tubular member and connected to form the valve body, or one end of the tubular member is partially inserted into the valve seat or valve seat assembly to form the valve body. The connection method includes but is not limited to welding, rolling, interference fit or threaded connection. The valve seat or valve seat assembly, valve needle spring, valve needle, adjustment spring, and adjustment limit block are arranged in sequence in the tubular member. In order to limit the valve needle spring, the valve seat or valve seat assembly can extend around the valve port end along the axial direction, and the extended structure encloses a cylindrical cavity or a cylindrical opening as the valve seat cavity, in which a part or all of the valve needle spring can be placed, and a step can be set in the cylindrical cavity or the cylindrical opening. The two interfaces of the adaptive expansion valve can also be set on the valve seat or valve seat assembly, or one is set on the valve seat or valve seat assembly and the other is set on the tubular member, one is connected to the throttle valve hole, and the other is connected to the inner cavity of the expansion valve.

[0010] For the valve body of the combined structure, the valve seat or the valve seat assembly and the tubular member can be connected by threads and additionally provided with sealing facilities, and the threaded rotation of the valve seat or the valve seat assembly can also adjust the relative position of the valve needle.

[0011] One or both end surfaces of the valve seat or valve seat assembly may be configured as a groove, a cylindrical opening, a recessed cavity, an annular groove, or a step, and may also be configured as a plane.

[0012] The cylindrical space enclosed by the structure extending along the axial direction on the outside of the valve seat or valve seat assembly at the valve port end of the valve seat or valve seat assembly is a valve seat cavity. A step or annular groove may be provided in the valve seat cavity. An annular cover plate may be provided at the valve seat cavity, and one end of the valve needle spring may be provided at the annular cover plate.

[0013] The valve seat or the valve port end surface of the valve seat assembly may be provided with an annular bracket or annular ring of the regulating spring to facilitate limiting the displacement of the regulating spring.

[0014] A part or all of the valve needle spring is placed in the valve seat cavity of the valve seat or the valve seat assembly.

[0015] The valve seat assembly at least comprises a valve seat body and a valve hole core, the valve hole core is provided with a throttle valve hole, the valve seat body is provided with an axial center hole, and the valve hole core is nested and fixed in the axial center hole of the valve seat body.

[0016] The inlet and outlet of the throttle valve hole channel can be configured to be in a bell-mouth shape, which can reduce the generation of flow vortices.

[0017] The valve needle spring is sleeved on the outside of the front section of the valve needle. One end of the valve needle spring can be arranged on the outer wall of the valve needle or on the step or the annular groove, and the other end is arranged on the valve seat or the valve seat assembly. Both ends of the valve needle spring can be fixed on the contacting surface, or one end is fixed and the other end is not fixed, or both ends are not fixed.

[0018] In order to make the end surface of the valve needle spring flat and maintain the coaxiality of the valve needle and the throttle valve hole, a transition flat ring can be provided at one or both ends of the valve needle spring. The purpose of the transition flat ring is to enable the valve needle spring to be flatly arranged on the surface of the contacted object and maintain the coaxiality of the valve needle installation.

[0019] The valve needle spring can be a flat head spring.

[0020] For simplicity, the valve needle spring may not be provided with transition flat rings at both ends.

[0021] The valve needle outer surface may be composed of the same or different revolution surfaces.

[0022] One or more steps or annular grooves may be arranged on the outer side of the valve needle. One end of the valve needle spring may be positioned or limited on the step or annular groove on the outer side of the valve needle.

[0023] An annular groove may be provided at the valve needle step, and one end of the valve needle spring may be embedded in the annular groove.

[0024] An axial flow passage may be provided on or outside the valve needle. Of course, no axial flow passage may be provided on or outside the valve needle.

[0025] The tail or end of the valve needle may be provided with a step or an annular groove or a recess or a cavity to facilitate the arrangement of the regulating spring.

[0026] In order to make the end surface of the adjusting spring flat and maintain the coaxiality of the valve needle, a transition flat ring can be provided at one end or both ends of the adjusting spring so that the adjusting spring can be evenly arranged on the surface of the contacting object.

[0027] The adjusted spring may be a flat head spring.

[0028] For simplicity, the adjusting spring may not be provided with transition flat rings at both ends.

[0029] The two ends of the regulating spring are respectively arranged on the valve needle and the regulating limit block. The two ends of the regulating spring can be fixed on the contacting surface, or one end is fixed and the other end is not fixed, or both ends are not fixed.

[0030] The two ends of the regulating spring can be fixed on the valve needle and the regulating limit block respectively, which can effectively prevent the valve needle from rotating.

[0031] An external thread may be provided on the outer side of the adjustment limit block.

[0032] The front or leading end of the adjustment limit block may be provided with a step, a ring groove, a groove, or a cavity to facilitate the setting of the adjustment spring, and the tail of the adjustment limit block may be provided with a structure for convenient screwing and adjustment, such as a structure including but not limited to a slot, a cross slot, a hexagonal socket, or other internal polygonal structures, or a protruding polygonal boss / ring, an adjustment rod, or the like that is convenient for screwing in and out with tools.

[0033] A pressure plate or a pressure ring for fixing the adjusting spring may be arranged between the adjusting spring and the adjusting limit block, an annular step may be arranged on the pressure plate or the pressure ring, and the adjusting limit block acts on the pressure plate or the pressure ring.

[0034] The inner wall of one end of the valve body may be provided with an internal thread, and the regulating limit block may be provided with an external thread. The regulating limit block may be screwed in and out of the valve body to adjust the tightness of the regulating spring and the valve needle spring to achieve the best valve switching capability of the valve needle. A sealing ring may be provided at the contact between the regulating limit block and the valve body.

[0035] The inner side of the valve body may not be provided with an internal thread, and the regulating limit block may be provided with an external thread. A threaded sleeve may be provided between the valve body and the regulating limit block, and one or more annular grooves may be provided on the outer periphery of the threaded sleeve. The threaded sleeve is fixed on the inner side of the valve body, and the regulating limit block may be screwed in and out to adjust the tightness of the regulating spring and the valve needle spring to achieve the best switching capability of the valve needle. A sealing ring may be provided at the contact between the regulating limit block and the threaded sleeve.

[0036] An axial circulation channel may be provided on or outside the adjusting limit block; or no axial circulation channel may be provided on or outside the adjusting limit block.

[0037] A hole cavity may be provided at the tail end or tail of the valve needle, a step may be provided in the hole cavity, and one or more steps or annular grooves may also be provided at the front of the adjusting limit block. The equivalent diameter of at least one step on the adjusting limit block is larger than the inner diameter of the adjusting spring.

[0038] The adjusting spring and the front section of the adjusting limit block can be inserted into the hole cavity at the tail end or tail part of the valve needle. A rigid ball can be arranged between the adjusting spring and the bottom of the hole cavity at the tail end or tail part of the valve needle to maintain the balance of the adjusting spring. The rigid ball may also be omitted. The adjusting spring can be sleeved on the outside of the front section of the adjusting limit block and stop at a step on the adjusting limit block. The equivalent diameter of the step is larger than the inner diameter of the adjusting spring, which can block and compress the adjusting spring.

[0039] The valve needle, regulating spring and regulating limit block can form a regulating valve needle assembly, and the edge of the cavity at the tail end or tail of the valve needle can also be shrunken or use an annular or semi-annular retaining ring to limit the sliding out of the regulating spring and the inserted part of the regulating limit block.

[0040] The front end or front part of the adjusting limit block can also be set as a cavity, a step can be set in the cavity, and one or more steps or annular grooves can be set in the rear section of the valve needle. The equivalent diameter of at least one step on the valve needle is larger than the inner diameter of the adjusting spring.

[0041] The adjusting spring and the tail of the valve needle can be placed in the hole cavity at the front end or front part of the adjusting limit block. A rigid ball can be arranged between the adjusting spring and the bottom of the hole cavity at the front end or front part of the adjusting limit block to maintain the balance of the adjusting spring. The rigid ball may also be not arranged. The adjusting spring can be sleeved on the outside of the rear section of the valve needle and stop at a step on the rear section of the valve needle. The equivalent diameter of the step is larger than the inner diameter of the adjusting spring, which can block and compress the adjusting spring.

[0042] The valve needle, adjusting spring and adjusting limit block can form an adjusting valve needle assembly. The edge of the cavity at the front end or front part of the adjusting limit block can also be narrowed or use an annular or semi-annular retaining ring to limit the sliding out of the adjusting spring and the inserted part of the rear section of the valve needle.

[0043] A sealing ring may be provided at the contact point between the regulating limit block and the valve body to prevent leakage of the fluid in the valve when the regulating limit block is adjusted.

[0044] The valve body is provided with an interface on the side. When the end of the valve body close to the adjusting limit block does not serve as the interface of the adaptive expansion valve, it serves as the adjusting port of the adjusting limit block. The adjusting limit block may not be provided with an axial flow channel. A sealing ring may be provided at the contact between the adjusting limit block and the valve body to prevent leakage of the fluid in the valve when the adjusting limit block is adjusted. The end of the valve body close to the adjusting limit block may be sealed with a detachable or non-detachable sealing cap or sealing cover, such as including but not limited to setting a thread and sealing it with a screw cover to facilitate the removal and adjustment of the adjusting limit block at any time. A sealing facility may be added when the screw cover is sealed, or other sealing methods may be used at the end of the valve body close to the adjusting limit block: such as welding and rolling sealing caps or sealing covers, closing the mouth, fusing the mouth, etc.

[0045] In a simple case, when the valve body is a split structure, the tubular member can be a valve cover with one end closed. In this case, there is no need to provide an adjusting limit block or an adjusting limit block for fixing. During adjustment, the valve seat or valve seat assembly can be used to control the elastic force of the valve needle spring and the adjusting spring so that the valve needle is in a suitable position, and then the valve seat or valve seat assembly is fixed.

[0046] An adjusting rod may be provided or connected to the rear end or back portion of the adjusting limit block, and the adjusting rod may be hidden in the sealing cap or exposed outside the sealing cover. The adjusting rod passes through the sealing cap, and a sealing device may be used to seal the two.

[0047] The end of the adjusting rod is configured to be in a shape suitable for being twisted by a tool, and an adjusting handle may also be added to the end of the adjusting rod to facilitate twisting by hand or with a tool.

[0048] When the valve body is a split structure, the tubular component can be a valve cover with one end closed, a hole can be set in the middle of the bottom of the valve cover, the adjusting rod of the adjusting limit block passes through the hole at the bottom of the valve cover, and a sealing facility is set between the adjusting rod and the hole at the bottom of the valve cover. The adjusting limit block is adjusted by the adjusting rod to control the elastic force of the valve needle spring and the adjusting spring so that the valve needle is located in a suitable position.

[0049] A rail groove or a sliding rail is provided on the outside of the adjusting limit block, and a rail sleeve of the sliding rail or the rail groove adapted to the outside of the adjusting limit block is provided on the inner wall of the valve body or the tubular component. The adjusting limit block slides axially in the valve body or the tubular component, and an adjusting knob and a knob sleeve can be provided in the valve body or the tubular component behind the adjusting limit block. An internal threaded hole can also be provided at the rear end of the adjusting limit block. A push rod is provided on the adjusting knob, and the push rod is provided with 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 adjusting limit block. The adjusting knob is connected through a knob sleeve fixed on the valve body or the inner wall of the tubular component. The knob sleeve limits the axial movement of the adjusting knob, and the adjusting knob can rotate. Sealing measures are provided between the adjusting knob and the knob sleeve. Alternatively, a protruding rod-shaped object may be provided at the rear end of the adjustment limit block, and an external thread may be provided on the rod-shaped object, and an internal thread hole may be provided at the front end of the adjustment knob, so that the external threaded rod-shaped object at the rear end of the adjustment limit block may be screwed into the internal thread of the adjustment knob top rod to adjust the movement of the adjustment limit block. A structure for a tool to screw may be provided at the rear end of the adjustment knob to facilitate adjustment.

[0050] A sealing device is provided between the regulating rod and the sealing cap or the valve cover.

[0051] There may only be relative rotational movement between the adjusting rod and the sealing cap or the valve cover.

[0052] To prevent the valve needle from rotating or colliding with the valve body, one or more axial guide grooves or guide holes can be set on the valve needle, and one or more guide rails can be set in the valve body. The guide rails pass through the guide grooves or guide holes on the valve needle. One end or both ends of the guide rail are fixed, and can be fixed to the valve seat or valve seat assembly, to the inner wall of the valve body, to the thread sleeve, or to the adjusting limit block.

[0053] For simplification, the inner side of the valve body may not be provided with an internal thread, and the regulating limit block may not be provided with an external thread, but only serves as an regulating limit component. In this case, one or more annular grooves may be provided on the outer periphery of the regulating limit block to facilitate rolling sealing. After the tightness of the regulating spring is adjusted and the valve needle is in the optimal position, the regulating limit block can be fixedly sealed on the inner wall of the valve body.

[0054] 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 valve needle.

[0055] A filter may be arranged in one or both interface channels of the adaptive expansion valve.

[0056] In order to prevent fluid leakage, sealing facilities may be provided at all movable parts in the adaptive expansion valve that are associated with the outside of the valve.

[0057] A second aspect of the present invention provides an adaptive expansion valve assembly, the adaptive expansion valve assembly comprising: an adaptive expansion valve structure as in any of the above technical solutions.

[0058] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention uses variable flow throttling as an adaptive expansion valve, initially controls the regulating limit block so that the valve needle is in a closed or slightly open equilibrium state under the action of the valve needle spring and the regulating spring (if used as a two-way expansion valve, it can be adjusted in advance to the optimal opening for reverse flow, i.e., heating operation). When the fluid is throttled from the adaptive expansion valve inlet through the valve seat or the throttling valve hole on the valve seat assembly, as the incoming fluid flow rate increases or the pressure difference increases, the thrust of the fluid on the valve needle will also increase, the original valve needle balance force is broken, the valve needle moves, the regulating spring is further compressed, and the valve mouth is opened. Under the action of the valve needle spring, the regulating spring, and the fluid pressure, the force on the valve needle will be rebalanced. Similarly, when the flow rate decreases or the pressure difference decreases, the thrust of the fluid on the valve needle decreases, the valve needle spring recovers and is compressed, the valve needle moves in the opposite direction, the valve mouth is closed, and under the action of the valve needle spring, the regulating spring, and the fluid pressure, the force on the valve needle is rebalanced. When flowing in the reverse direction, the fluid flows in from the other interface, flows out after being throttled by the valve hole, and can be used for adaptive throttling under bidirectional variable flow or variable pressure difference.

[0059] It should be noted that the precise realization of unidirectional and bidirectional flow requirements can also be achieved as follows: the adaptive expansion valve and its components proposed by the present invention, two sets of components are used in reverse parallel to meet the bidirectional flow requirements. Or the adaptive expansion valve and its components proposed by the present invention are connected in series with a one-way valve to form a new component to meet the unidirectional demand, and the two sets of new components are used in reverse parallel to meet the bidirectional flow requirements.

[0060] In addition, due to the restraining damping effect of the compressed valve needle spring and the compressed regulating spring, the throttling flow caused by the pressure fluctuation can be reduced, and the noise caused by the valve needle vibration can be reduced. The trumpet-shaped inlet and outlet can effectively reduce the flow vortex, less vortex or vortex-free flow, and further reduce the flow noise. Since they are all mechanical parts, and the damping effect of the springs at both ends of the valve needle, the displacement of the moving parts is small, and the valve needle oscillates little, which can basically eliminate mechanical collision noise, high reliability, no cumbersome control strategy, reduce the failure rate of the unit operation, make the refrigeration unit simple and reliable, and reduce costs, and also facilitate maintenance and replacement, and improve 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

[0061] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0062] Figure 1 The figure is a structural schematic diagram of a combined valve body adaptive expansion valve.

[0063] Figure 2 A structural schematic diagram of an integrated valve body adaptive expansion valve.

[0064] Figure 3 Another structural schematic diagram of an adaptive expansion valve.

[0065] Figure 4 It is another structural schematic diagram of an adaptive expansion valve.

[0066] Figure 5 It is another structural schematic diagram of an adaptive expansion valve.

[0067] Among them, 1- tubular member, 2- valve seat, 3- valve needle spring, 4- valve needle, 5- adjusting spring, 6- retaining ring, 7- thread sleeve, 8- adjusting limit block, 9- throttle valve hole, 10- adjusting limit block flow hole, 11- valve body, 12- valve needle spring, 13- valve needle, 14- adjusting spring, 15- adjusting limit block flow hole, 16- adjusting limit block, 17- throttle valve hole, 18- valve body, 19- valve needle spring, 20- valve needle, 21- adjusting spring, 22- retaining ring, 23- adjusting limit block, 24- sealing cap, 25- connection 26-interface, 27-throttle valve hole, 28-valve seat body, 29-tubular component, 30-valve needle spring, 31-valve needle, 32-retaining ring, 33-adjusting spring, 34-rail sleeve, 35-adjusting limit block, 36-valve hole core, 37-interface pipe, 38-interface pipe, 39-adjusting knob, 40-knob sleeve, 41-sealing cap, 42-tubular component, 43-valve seat, 44-valve needle spring, 45-valve needle, 46-adjusting spring, 47-adjusting limit block, 48-adjusting limit block upper flow hole, 49-throttle valve hole DETAILED DESCRIPTION

[0068] The present invention is further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying 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 in the accompanying drawings may be omitted.

[0069] Example 1

[0070] like Figure 1 As shown, this embodiment provides a structural schematic diagram of a combined valve body adaptive expansion valve. It can be implemented as follows:

[0071] The tubular component 1, valve seat 2 and throttle valve hole 9, valve needle spring 3, valve needle 4, adjustment spring 5, retaining ring 6, thread sleeve 7, external thread of adjustment limit block 8 and flow hole 10 are processed in advance. Then assemble the above processed parts together: first, the valve seat 2 and the tubular component 1 can be assembled and rolled to form a valve body, and then the valve needle assembly is assembled: the adjustment spring 5 is placed in the rear cavity of the valve needle 4, and then the front section of the adjustment limit block 8 is inserted and the retaining ring 6 is set, then the thread sleeve 7 is put on the outside of the adjustment limit block 8, and then the valve needle spring 3 is put on the prepared valve needle assembly and then placed in the assembled valve body, and then the thread sleeve 7 is positioned with a tool and fixed inside the tubular component 1. After assembly, the adjustment limit block can be adjusted to the appropriate position of the valve needle. After installation on the refrigeration equipment, according to the system operation status, the refrigerant fluid can enter the throttle valve hole 9 from the end of the valve seat 2 after throttling, and then flow out of the expansion valve through the flow hole 10 of the adjustment limit block.

[0072] Example 2

[0073] like Figure 2 As shown, this embodiment provides a structural schematic diagram of an integrated valve body adaptive expansion valve. It can be implemented as follows:

[0074] Process the components in advance: valve body 11 (including the internal thread at the end of the inner wall of valve body 11, throttle valve hole 17 on valve body 11), valve needle spring 12, valve needle 13, adjustment spring 14, adjustment stop block 16 (including external thread and flow hole 15), then assemble valve needle 13, adjustment spring 14, adjustment stop block 16 and retaining ring into valve needle assembly, then put valve needle spring 12 on the valve needle front section of the set valve needle assembly, put it into the inner cavity of valve body 11, then turn the adjustment stop block 16, and adjust the position of valve needle 13 to the best. After being installed on the refrigeration equipment, the refrigerant fluid can be throttled from the valve seat end through the throttle valve hole 17, and then flow out of the expansion valve through the flow hole 15 of the adjustment stop block.

[0075] Example 3

[0076] like Figure 3 As shown, this embodiment provides a structural schematic diagram of an adaptive expansion valve. It can be implemented as follows:

[0077] Process the components in advance: valve body 18 (including the internal thread at the end of the inner wall of valve body 18, throttle valve hole 27, interface 25 and interface 26 on valve body 18), valve needle spring 19, valve needle 20, adjustment spring 21, retaining ring 22, adjustment limit block 23 and external thread, sealing cap 24, then assemble valve needle 14, adjustment spring 15, adjustment limit block 23, retaining ring 22, etc. into valve needle assembly, and install the sealing ring of adjustment limit block 23, put valve needle spring 19 on the outer side of the valve needle front section of the set valve needle assembly, put it into the inner cavity of valve body 18, then screw the adjustment limit block 23, pre-adjust the position of valve needle 20, and finally cover the sealing cap 24. After installation on the refrigeration equipment, the sealing cap 24 can be removed, and the adjustment limit block 23 can be adjusted with tools according to the system operation status. After the system runs to the best state, the sealing cap 24 can be covered. The refrigerant fluid can enter the throttling device from the interface pipe 26 and then flow out of the expansion valve from the interface pipe 25.

[0078] Example 4

[0079] like Figure 4 As shown, this embodiment provides another structural schematic diagram of an adaptive expansion valve. It can be implemented as follows:

[0080] The valve seat 28 and two interfaces, valve cover 29, valve needle spring 30, valve needle 31, retaining ring 32, adjusting spring 33, rail sleeve 34, adjusting stop block 35 and internal thread, valve hole core 36, adjusting knob 39, knob sleeve 40, sealing cap 41, interface pipe 37 and 38 are processed in advance. Then, the above processed parts are assembled together: first, the valve hole core 36, interface pipe 37 and interface pipe 38 are welded and fixed to the valve seat body 28 to form a valve seat assembly, then the valve needle 31, adjusting spring 33, adjusting stop block 35 and retaining ring 32 are assembled to form a valve needle assembly, the rail sleeve 34 is sleeved on the outside of the adjusting stop block 35, the adjusting knob 39 and the knob sleeve 40 are installed, and then the valve needle spring 30 and the valve needle assembly are sleeved, and they are installed together in the tubular member 29, and the tubular member 29 is rolled at the corresponding position to fix the valve seat body 28, the rail sleeve 34 and the knob sleeve 40 to the tubular member 29, and the sealing cap 41 is installed. After installation on the refrigeration equipment, according to the system operation status, the sealing cap 41 is removed, and the valve needle 31 is adjusted to the optimal position by rotating the adjustment knob 39 and moving the adjustment limit block 35 by thread movement. The refrigerant fluid can enter the throttling from the interface pipe 37 and then flow out of the expansion valve from the interface pipe 38.

[0081] Example 5

[0082] like Figure 5 As shown, this embodiment provides another structural schematic diagram of an adaptive expansion valve. It can be implemented as follows:

[0083] The valve seat 43 (including the throttle valve hole 49), the tubular member 42, the valve needle spring 44, the valve needle 45, the adjustment spring 46, and the adjustment stop block 47 (including the flow hole 48) are processed in advance. Then, the above processed parts are assembled together: first, the valve seat 43, the valve needle spring 44, the valve needle 45, the adjustment spring 46, and the adjustment stop block 47 are sequentially placed in the tubular member 42, and the corresponding spring pressure is adjusted by the tooling, and then the valve seat 43 and the tubular member 42 at the adjustment stop block 47 are respectively rolled and fixed. After being installed on the refrigeration equipment, the refrigerant fluid can enter the expansion valve from the valve seat 43 end, pass through the throttling, and then flow out of the expansion valve from the adjustment stop block 48 end.

[0084] The above describes in detail the adaptive expansion valve and five implementation schemes of the expansion valve provided by the present invention. Five specific examples are used in this paper to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention.

[0085] It should be further explained that although the application implementation schemes listed are all designed for the refrigeration field, the present invention proposes an adaptive expansion valve and its components that can be used in the field of fluid flow control as a flow regulating valve. The throttling mentioned here is actually the control of the fluid flow. Different equipment and different application scenarios will have different control requirements for fluid flow. The throttling valve hole, valve needle and other components can be optimized and designed accordingly for different application scenarios and equipment.

[0086] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0087] Unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices should be considered as part of the authorized specification.

[0088] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by directional words such as "front section, rear section, front part, tail, tail section, last section", "front end, rear end, upper end, lower end, end", "longitudinal, transverse" and "upper part, lower part, side, bottom surface, front, back, left, right", etc. is usually based on the orientation or positional relationship shown in the drawings, and is 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 referred device or element 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 contour of each component itself.

[0089] In addition, it should be noted that the use of words such as "first", "then", and "again" to limit the processing 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.

[0090] 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 protection scope of the claims of the present invention.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adaptive expansion valve having at least two fluid inlet and outlet ports, one port being connected to the valve hole channel, and the other port being connected to the inner cavity of the valve body, characterized in that: At least it includes a valve body, a valve needle, a valve needle spring, an adjusting spring, and an adjusting limit block. The valve body is an integral structural component with a valve seat arranged at one end, or a combined structure of at least a valve seat or a valve seat assembly and a tubular component. The valve needle spring, valve needle, adjusting spring, and adjusting limit block are arranged in the valve body of the rear section of the valve seat or the valve seat assembly. A throttle valve hole is arranged on the valve seat or the valve seat assembly. The front end of the valve needle faces the valve port of the throttle valve hole. The valve needle spring is sleeved on the outer side of the needle thin part of the front section of the valve needle. One end of the valve needle spring is arranged on the valve needle, and the other end of the valve needle spring is arranged on the valve seat or the valve seat assembly. The adjusting spring is arranged between the valve needle and the adjusting limit block, one end of the adjusting spring is arranged on the tail section or tail part of the valve needle, and the other end is arranged on the front section or front part of the adjusting limit block, the adjusting limit block and the inner wall of the valve body are threadedly connected, or the adjusting limit block and the inner wall of the valve body are threadedly connected through a threaded connection between a thread sleeve fixed on the inner wall of the valve body, or through a rail sleeve fixed on the inner wall of the valve body, or the adjusting limit block is fixed on the inner wall of the valve body, a gap is left between the valve needle and the inner wall of the valve body, and the valve needle can move axially in the valve body under the action of force.

2. The adaptive expansion valve according to claim 1, characterized in that: The valve seat or valve seat assembly is arranged at one end of the tubular component to form the valve body, or the valve seat or valve seat assembly is partially or completely inserted into one end of the tubular component and connected to form the valve body, or one end of the tubular component is partially inserted into the valve seat or valve seat assembly to form the valve body.

3. The adaptive expansion valve according to claim 1, characterized in that: The regulating limit block is fixed on the inner wall of the valve body.

4. The adaptive expansion valve according to claim 1, characterized in that: An external thread is arranged on the outer side of the adjusting limit block.

5. The adaptive expansion valve according to claim 1, characterized in that: The valve seat or the valve port end surface of the valve seat assembly may be provided with an annular bracket or an annular ring of the regulating spring.

6. The adaptive expansion valve according to claim 1, characterized in that: The adjusting limit block is provided with an axial circulation channel on or outside thereof, or is not provided with an axial circulation channel.

7. The adaptive expansion valve according to claim 1, characterized in that: A guide rail or a rail groove is arranged in the valve body.

8. The adaptive expansion valve according to claim 1, characterized in that: An adjustment knob may be provided in the valve body or the tubular member.

9. The adaptive expansion valve according to claim 1, characterized in that: A filter is arranged in one or two interface channels of the adaptive expansion valve.

10. An adaptive expansion valve assembly, characterized in that: The adaptive expansion valve assembly comprises: an adaptive expansion valve structure according to any one of claims 1 to 9.

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