Electronic expansion valve and refrigeration equipment

Abstract

The utility model discloses an electronic expansion valve and a refrigeration device, and relates to the technical field of fluid control components, wherein the electronic expansion valve includes a connecting seat assembly and a valve needle assembly, and the valve needle assembly includes a first valve needle, a first sealing gasket, and a second valve needle, wherein the first valve needle is used to open or close the valve port; the second valve needle is inserted into the accommodating cavity, and the push piece of the second valve needle can move relative to the stopper along the axial direction of the accommodating cavity to open or close the flow port, and the push piece can also push the stopper to move away from the valve port to enable the first valve needle to open the valve port. The technical solution of the utility model is to arrange the second valve needle and the first sealing gasket in the accommodating cavity of the first valve needle, and the second valve needle and the first sealing gasket realize small flow regulation, and the first valve needle cooperates with the valve port to realize full flow regulation, which can meet the flow regulation function of different requirements, so that the electronic expansion valve can realize accurate flow control under different working conditions, thereby improving the applicability of the flow regulation of the electronic expansion valve.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control components, in particular to an electronic expansion valve and a refrigeration device. Background Art

[0002] In the automotive heat pump thermal management system, there are functional scenarios that require both flow regulation and full circulation. The current mainstream solution in the market is to use electronic expansion valves and solenoid valves in parallel to achieve this. However, the system solution of using electronic expansion valves and solenoid valves in parallel has complex system piping redundancy, high system structure cost, and complex control logic and algorithms also increase costs to a certain extent, and system fault diagnosis is difficult to achieve. Utility Model Content

[0003] The main purpose of the utility model is to provide an electronic expansion valve and a refrigeration device, aiming to improve the applicability of flow rate regulation of the electronic expansion valve.

[0004] To achieve the above-mentioned purpose, the electronic expansion valve proposed in the utility model comprises a connecting seat assembly and a valve needle assembly, wherein the connecting seat assembly has an inner cavity and a valve port communicating with the inner cavity, the valve needle assembly is inserted into the inner cavity, and the valve needle assembly comprises:

[0005] A first valve needle has an accommodating cavity extending through the first valve needle in its axial direction, wherein a stopper is provided on an inner wall of the accommodating cavity, and the first valve needle is used to open or close the valve port;

[0006] a first sealing gasket, disposed at one end of the accommodating cavity close to the valve port, the first sealing gasket being provided with a flow port, the flow port being in communication with the accommodating cavity and the valve port; and

[0007] The second valve needle is inserted into the accommodating cavity, and a push piece is provided on the outer wall of the second valve needle. The push piece can move relative to the stop piece along the axial direction of the accommodating cavity to open or close the flow port. The push piece can also push the stop piece to move away from the valve port to enable the first valve needle to open the valve port.

[0008] In one embodiment, there is a gap between the outer circumferential wall of the second valve needle and the inner circumferential wall of the accommodating cavity, the valve needle assembly also includes a sealing ring, and one of the outer circumferential wall of the second valve needle and the inner circumferential wall of the accommodating cavity is provided with a first mounting groove, and the sealing ring is arranged in the first mounting groove and abuts the other.

[0009] In one embodiment, the first mounting groove is formed on the inner circumferential wall of the accommodating cavity, and the valve needle assembly further includes a limiting member, which is connected to the inner circumferential wall of the accommodating cavity and limits the sealing ring in the first mounting groove.

[0010] In one embodiment, the stop member and the push member are arranged at one end of the accommodating cavity away from the valve port, the stop member includes a main body and a stop member, one end of the main body close to the valve port abuts against the limiting member, and the other end of the main body away from the valve port is connected to the stop member, the push member is arranged between the limiting member and the stop member, and can push the stop member.

[0011] In one embodiment, a step surface is formed on the inner circumferential wall of the accommodating cavity, one end of the stop member close to the valve port abuts against the step surface, and the other end of the stop member away from the valve port is riveted to the end of the first valve needle; there is a distance between the limit member and the stop member, and the push member is arranged between the limit member and the stop member, and the limit member is riveted to the inner circumferential wall of the accommodating cavity.

[0012] In one embodiment, the first valve needle is provided with a connecting hole, which is connected to the inner cavity and the accommodating cavity. The stopper is located on the side of the connecting hole in the axial direction of the inner cavity away from the valve port, and is formed with an inner wall of the accommodating cavity with a clearance groove connected to the connecting hole. When the push member pushes the stopper, the push member is located in the clearance groove.

[0013] In one embodiment, a second mounting groove is provided on the outer peripheral wall of the second valve needle, and the push member is provided in the second mounting groove.

[0014] In one embodiment, the outer peripheral wall of the second valve needle protrudes outward to form the push member.

[0015] In one embodiment, a riveted portion is provided at one end of the first valve needle close to the valve port, and the riveted portion is riveted to the first sealing gasket.

[0016] In one embodiment, the electronic expansion valve further includes a gasket, which is disposed between the first sealing gasket and the riveted portion and riveted to the riveted portion.

[0017] In one embodiment, the electronic expansion valve also includes a nut assembly and a reset member, the nut assembly includes a nut body and a screw, the nut body is arranged at one end of the inner cavity away from the valve port, one end of the screw is threadedly connected to the nut body, and the other end is driven and connected to the second valve needle, the reset member is sleeved on the outer periphery of the screw, one end abuts the nut body, and the other end abuts the first valve needle.

[0018] In one embodiment, the connecting seat assembly includes a connecting seat body, a connecting seat sleeve and a second sealing gasket, the connecting seat sleeve is arranged at one end of the connecting seat body away from the nut assembly, and forms a third mounting groove with the connecting seat body, the second sealing gasket is arranged in the third mounting groove, and the second sealing gasket is annular to form the valve port.

[0019] In one embodiment, at least one of the first valve needle and the second valve needle is provided with a balancing hole penetrating along the axial direction thereof, and the balancing hole is communicated with the valve port.

[0020] The utility model also provides a refrigeration device, comprising the aforementioned electronic expansion valve.

[0021] The technical solution of the utility model is to arrange a second valve needle and a first sealing gasket in the accommodating cavity of the first valve needle. The second valve needle and the first sealing gasket realize small flow regulation, and the first valve needle cooperates with the valve port to realize full flow regulation. It can meet the flow regulation function of different requirements, so that the electronic expansion valve can realize precise flow control under different working conditions, thereby improving the applicability and flexibility of the flow regulation of the electronic expansion valve.

[0022] In addition, the electronic expansion valve proposed in the utility model has the functions of expansion valve flow regulation and solenoid valve full circulation. Compared with the traditional small-diameter electronic expansion valve and solenoid valve parallel structure, it can greatly simplify the integrated module pipeline design, simplify the system structure, and solve the disadvantages of complex system pipelines. It is in line with the technical route of the thermal management system towards integration, modularization, and lightweight development. At the same time, it reduces the difficulty of system control logic and algorithms, greatly reduces production costs, and improves comprehensive market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 A structural schematic diagram of an embodiment of an electronic expansion valve provided by the utility model;

[0025] Figure 2 A schematic structural diagram of an embodiment of a valve needle assembly provided by the utility model;

[0026] Figure 3 A structural schematic diagram of another embodiment of the valve needle assembly provided by the utility model;

[0027] Figure 4A structural schematic diagram of another embodiment of the valve needle assembly provided by the utility model;

[0028] Figure 5 A structural schematic diagram of another embodiment of the valve needle assembly provided by the utility model;

[0029] Figure 6 This is a structural schematic diagram of another embodiment of the valve needle assembly provided by the utility model.

[0030] Description of Figure Numbers:

[0031] 10. Electronic expansion valve; 100. Connecting seat assembly; 200. Valve needle assembly; 300. Gasket; 400. Nut assembly; 410. Nut body; 420. Screw; 500. Reset member; 110. Connecting seat body; 111. Inner cavity; 120. Connecting seat sleeve; 130. Second sealing gasket; 140. Valve port; 210. First valve needle; 211. Accommodating cavity; 2111. Step surface; 2112. Displacement groove; 212. Connecting hole; 213. Riveted part; 220. Second valve needle; 221. Second mounting groove; 231. Flow port; 230. First sealing gasket; 240. Stop member; 241. Body; 242. Stop member; 250. Push member; 260. Sealing ring; 270. First mounting groove; 280. Limit member; 290. Balance hole.

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0036] The utility model provides an electronic expansion valve 10 .

[0037] The electronic expansion valve 10 proposed in the utility model can be applied to a refrigeration system, and the fluid medium flowing through the electronic expansion valve 10 is a refrigerant used for heat exchange in the refrigeration system. At this time, the electronic expansion valve 10 is installed at the inlet of the evaporator of the refrigeration system. The electronic expansion valve 10 serves as a dividing element between the high-pressure side and the low-pressure side of the refrigeration system, and throttles and reduces the pressure of the high-pressure liquid refrigerant from the liquid storage dryer and other devices, thereby adjusting and controlling the dosage of the liquid refrigerant entering the evaporator, so that the dosage of the liquid refrigerant can meet the requirements of the external refrigeration load. The electronic expansion valve 10 can be applied to an air-conditioning system or a vehicle heat pump thermal management system, and the fluid medium flowing through the electronic expansion valve 10 can also be other fluid media except the refrigerant, as long as the electronic expansion valve 10 can achieve throttling and reducing the pressure of the fluid medium, there is no specific restriction on this.

[0038] See also Figure 1 and Figure 2In one embodiment of the utility model, the electronic expansion valve 10 includes a connection seat assembly 100 and a valve needle assembly 200. The connection seat assembly 100 has an inner cavity 111 and a valve port 140 connected to the inner cavity 111. The valve needle assembly 200 is arranged in the inner cavity 111. The valve needle assembly 200 includes a first valve needle 210, a first sealing gasket 230 and a second valve needle 220. The first valve needle 210 has an accommodating cavity 211 that passes through the axial direction thereof. The inner wall of the accommodating cavity 211 is provided with a stopper 240. The first valve needle 210 is used to open or close the valve port 140; the first sealing gasket 230 is provided with a stopper 240. The sealing gasket 230 is arranged at one end of the accommodating chamber 211 close to the valve port 140. The first sealing gasket 230 is provided with a flow port 231, and the flow port 231 is connected with the accommodating chamber 211 and the valve port 140; the second valve needle 220 is penetrated by the accommodating chamber 211, and the outer wall of the second valve needle 220 is provided with a push piece 250, which can move relative to the stop piece 240 along the axial direction of the accommodating chamber 211 to open or close the flow port 231, and the push piece 250 can also push the stop piece 240 to move away from the valve port 140 to enable the first valve needle 210 to open the valve port 140.

[0039] Specifically, the connection seat assembly 100 has an inner cavity 111 and a valve port 140. The end of the connection seat assembly 100 away from the valve port 140 is used to connect to the valve housing of the electronic expansion valve 10. The outer periphery of the connection seat assembly 100 is used to connect to the valve seat of the electronic expansion valve 10, or directly installed in the pipeline of the refrigeration system. The side wall of the connection seat assembly 100 has a medium inlet connected to the inner cavity 111, and the fluid can flow into the inner cavity 111 from the medium inlet and then flow out from the valve port 140.

[0040] The first valve needle 210 is generally in the shape of a hollow cylinder. The first valve needle 210 can move along the axial direction of the inner cavity 111 to open or close the valve port 140. When the first valve needle 210 abuts against the inner circumferential wall of the valve port 140, the first valve needle 210 forms a sealing match with the valve port 140. The first valve needle 210 has a receiving cavity 211, which penetrates along the axial direction of the first valve needle 210 and communicates with the inner cavity 111. The second valve needle 220 and the first sealing gasket 230 are arranged in the receiving cavity 211. The second valve needle 220 can move along the axial direction of the receiving cavity 211 to open or close the flow port 231. When the second valve needle 220 abuts against the inner circumferential wall of the flow port 231, the second valve needle 220 forms a sealing match with the first sealing gasket 230. During the movement, the second valve needle 220 has a first stroke in which it moves relative to the stopper 240 of the first valve needle 210 and a second stroke in which it pushes against the stopper 240 and drives the first valve needle 210 to move away from the valve port 140 .

[0041] By controlling the movement of the first valve needle 210 and the second valve needle 220 , the electronic expansion valve 10 has a valve closing state, a small flow rate regulation stage and a full flow rate regulation stage.

[0042] In the valve closing state, the first valve needle 210 abuts and seals against the inner wall of the valve port 140 to close the valve port 140 ; ​​at the same time, the second valve needle 220 abuts and seals against the inner wall of the flow port 231 to close the flow port 231 , thereby closing the electronic expansion valve 10 .

[0043] In the small flow rate regulation stage, by applying a certain regular electric pulse to the coil of the driving assembly, the rotor assembly is stimulated to rotate, thereby driving the screw 420 to rotate in the nut body 410 and move along the axial direction of the electronic expansion valve 10, so as to drive the second valve needle 220 to open and close the flow port 231, thereby realizing the function of small flow rate regulation. In this process, the first valve needle 210 is always in a state of abutting the inner peripheral wall of the valve port 140.

[0044] In the full flow adjustment stage, the coil of the driving assembly is continuously applied with a certain regular electric pulse to continue to stimulate the rotation of the rotor assembly, thereby driving the screw 420 to rotate in the nut body 410 and move along the axial direction of the electronic expansion valve 10, so as to drive the second valve needle 220 and the flow port 231 to reach the maximum opening. The push member 250 on the second valve needle 220 will push the stop member 240 on the first valve needle 210, thereby driving the first valve needle 210 to move away from the valve port 140, so that the large valve needle can open the valve port 140. In this process, the second valve needle 220 is always at the farthest distance from the first sealing gasket 230 and its flow port 231, and is at the maximum opening. By adjusting the distance between the first valve needle 210 and the valve port 140, the flow rate in the full flow state can be adjusted.

[0045] The technical solution of the present invention is to arrange the second valve needle 220 and the first sealing gasket 230 in the accommodating cavity 211 of the first valve needle 210. The second valve needle 220 and the first sealing gasket 230 realize small flow regulation, and the first valve needle 210 cooperates with the valve port 140 to realize full flow regulation, which can meet the flow regulation function of different requirements, so that the electronic expansion valve 10 can achieve precise flow control under different working conditions, thereby improving the applicability and flexibility of the flow regulation of the electronic expansion valve 10.

[0046] The electronic expansion valve 10 proposed in the utility model has the functions of expansion valve flow regulation and solenoid valve full circulation. Compared with the traditional small-diameter electronic expansion valve 10 and the parallel structure of the solenoid valve, it can greatly simplify the integrated module pipeline design, simplify the system structure, and solve the disadvantage of complex system pipelines. It is in line with the technical route of the thermal management system towards integration, modularization, and lightweight development. At the same time, it reduces the difficulty of system control logic and algorithms, greatly reduces production costs, and improves comprehensive market competitiveness.

[0047] In addition, in order to achieve small flow regulation and full flow regulation, some single-valve-needle full-flow internally balanced electronic expansion valves will set a certain small range of cone surface at the valve port of the full-flow internally balanced electronic expansion valve. The valve port is usually made of PTFE or similar plastic materials. The valve needle and the valve port can achieve sealing, small opening flow regulation, and large opening full flow through the cooperation of the valve needle and the valve port. However, considering the full flow, the valve needle and the valve port have a large diameter. In order to achieve the small opening flow regulation accuracy, the cone angle of the valve port cone is generally very small (less than 15°). In this way, when the valve needle and the valve port are sealed, the pressure difference around the valve port is affected by the high-pressure refrigerant, which is easy to lock the valve needle, resulting in a decrease in the valve opening ability or even direct jamming. Moreover, such a small taper seal is more prone to wear and lead to internal leakage, affecting the system energy efficiency. In addition, the valve of this structure must take into account the full flow, and can only achieve small flow section flow regulation through a small range of small cone angles, and the regulation accuracy is poor.

[0048] The electronic expansion valve 10 proposed in the utility model realizes small flow regulation through the second valve needle 220 and the first sealing gasket 230, and realizes full flow regulation through the cooperation of the first valve needle 210 and the valve port 140. It can not only meet the function of realizing small flow regulation and full flow regulation with one valve, but also make the flow regulation more precise, meeting the flow regulation requirements of the vehicle heat pump system. In addition, a large conical surface or a flat surface seal is used between the first valve needle 210 and the valve port 140, and between the second valve needle 220 and the first sealing gasket 230, which solves the problem that the electronic expansion valve with a full flow internal balance structure is prone to internal leakage failure after long-term operation, and also solves the problem that the electronic expansion valve with a full flow internal balance structure is prone to valve port and valve needle locking, thereby improving the reliability of the electronic expansion valve 10 and making the vehicle safer.

[0049] In one embodiment, there is a gap between the outer wall of the second valve needle 220 and the inner wall of the accommodating chamber 211. The valve needle assembly 200 also includes a sealing ring 260. One of the outer wall of the second valve needle 220 and the inner wall of the accommodating chamber 211 is provided with a first mounting groove 270. The sealing ring 260 is arranged in the first mounting groove 270 and abuts against the other.

[0050] See also Figure 2 and Figure 4There is a gap between the outer peripheral wall of the second valve needle 220 and the inner peripheral wall of the accommodating chamber 211, which facilitates the assembly of the second valve needle 220 and the accommodating chamber 211 on the one hand, and reduces the interference or friction between the second valve needle 220 and the first valve needle 210 when the second valve needle 220 moves relative to the first valve needle 210 on the other hand, thereby improving the convenience and sensitivity of the movement of the second valve needle 220. At the same time, since a small gap is formed between the outer peripheral wall of the second valve needle 220 and the inner peripheral wall of the accommodating chamber 211, the inner peripheral wall of the accommodating chamber 211 can provide guidance for the movement of the second valve needle 220. The distance between the outer peripheral wall of the second valve needle 220 and the inner peripheral wall of the accommodating chamber 211 is L1, 0.02mm≤L1≤0.12mm.

[0051] A sealing ring 260 is provided between the outer peripheral wall of the second valve needle 220 and the inner peripheral wall of the accommodating chamber 211 to achieve sealing between the first valve needle 210 and the second valve needle 220 to prevent internal leakage when the valve is closed. The sealing ring 260 is a rubber seal or a rubber and plastic combination seal.

[0052] The first installation groove 270 is used to install the sealing ring 260 and limit the sealing ring 260 to prevent the sealing ring 260 from shifting or misaligning during the movement of the second valve needle 220, resulting in sealing failure. The first installation groove 270 can be set on the outer peripheral wall of the second valve needle 220, and the sealing ring 260 is set in the first installation groove 270 and abuts against the inner peripheral wall of the accommodating cavity 211. The first installation groove 270 can also be set on the inner peripheral wall of the accommodating cavity 211, and the sealing ring 260 is set in the first installation groove 270 and abuts against the outer peripheral wall of the second valve needle 220.

[0053] In one embodiment, the first mounting groove 270 is formed on the inner circumferential wall of the accommodating cavity 211 , and the valve needle assembly 200 further includes a limiter 280 , which is connected to the inner circumferential wall of the accommodating cavity 211 and limits the sealing ring 260 in the first mounting groove 270 .

[0054] See also Figure 2 and Figure 3 The first installation groove 270 is formed on the inner peripheral wall of the accommodating chamber 211, and the sealing ring 260 is limited in the first installation groove 270 by the limiting member 280, so as to avoid the displacement or misalignment of the sealing ring 260, improve the installation stability and sealing performance of the sealing ring 260, and effectively prevent leakage problems. At the same time, the installation process of the sealing ring 260 is simplified, and the assembly difficulty and production cost are reduced. It can be understood that the sealing ring 260 is first sleeved on the second valve needle 220, and the second valve needle 220 is inserted into the accommodating chamber 211 from the end away from the valve port 140, and the sealing ring 260 is installed in the first installation groove 270, and then the limiting member 280 is installed in the accommodating chamber 211, and is arranged at the end of the sealing ring 260 away from the valve port 140, so as to limit the sealing ring 260 in the first installation groove 270.

[0055] In one embodiment, the stop member 240 and the push member 250 are arranged at one end of the accommodating chamber 211 away from the valve port 140, and the stop member 240 includes a main body 241 and a stop member 242. One end of the main body 241 close to the valve port 140 abuts against the limiting member 280, and the other end of the main body 241 away from the valve port 140 is connected to the stop member 242. The push member 250 is arranged between the limiting member 280 and the stop member 242, and can push the stop member 242.

[0056] See also Figure 2 The stopper 242 protrudes from the main body 241 and is disposed at one end of the main body 241 away from the limiting member 280. One end of the main body 241 close to the valve port 140 abuts against the limiting member 280 to limit and fix the limiting member 280. The stopper 242, the main body 241 and the limiting member 280 constitute a first clearance space. The push member 250 is disposed between the limiting member 280 and the stopper 242 and is located in the first clearance space. When the electronic expansion valve 10 is in the small flow regulation stage, the push member 250 moves in the first clearance space and moves relative to the stopper 240. When the electronic expansion valve 10 is in the full flow regulation stage, the push member 250 pushes the stopper 242 to drive the first valve needle 210 to move away from the valve port 140.

[0057] In one embodiment, a step surface 2111 is formed on the inner circumferential wall of the accommodating cavity 211, one end of the stop member 240 close to the valve port 140 abuts against the step surface 2111, and the other end of the stop member 240 away from the valve port 140 is riveted to the end of the first valve needle 210; there is a distance between the limit member 280 and the stop member 240, and the push member 250 is arranged between the limit member 280 and the stop member 240, and the limit member 280 is riveted to the inner circumferential wall of the accommodating cavity 211.

[0058] See also Figure 3 The stopper 240 is fixedly connected to the accommodating chamber 211 by abutting against the step surface 2111 of the accommodating chamber 211 and riveting with the end of the first valve needle 210. The limiter 280 is fixedly connected to the accommodating chamber 211 by riveting with the inner peripheral wall of the accommodating chamber 211. There is a spacing between the limiter 280 and the stopper 240, and a second clearance space is formed. The pusher 250 is arranged between the limiter 280 and the stopper 240 and is located in the second clearance space. When the electronic expansion valve 10 is in the small flow regulation stage, the pusher 250 moves in the second clearance space and moves relative to the stopper 240. When the electronic expansion valve 10 is in the full flow regulation stage, the pusher 250 pushes the stopper 240 to drive the first valve needle 210 to move away from the valve port 140.

[0059] Different from the previous embodiment, the stop member 240 in this embodiment does not need to abut the limiting member 280, so that the radial size of the limiting member 280 in the accommodating cavity 211 can be reduced, and the axial size of the stop member 240 in the accommodating cavity 211 can also be reduced, thereby reducing the volume and material of the limiting member 280 and the stop member 240.

[0060] In one embodiment, the first valve needle 210 is provided with a connecting hole 212, which is connected to the inner cavity 111 and the accommodating cavity 211. The stopper 240 is located on the side of the connecting hole 212 in the axial direction of the inner cavity 111 away from the valve port 140, and is formed with the inner wall of the accommodating cavity 211 with a make way groove 2112 connected to the connecting hole 212. When the push member 250 pushes the stopper 240, the push member 250 is located in the make way groove 2112.

[0061] See also Figures 4 to 6 A plurality of communication holes 212 are provided on the peripheral wall of the first valve needle 210, and the fluid in the inner cavity 111 can enter the accommodating cavity 211 through the communication holes 212, so that when the second valve needle 220 opens the flow port 231, the fluid in the accommodating cavity 211 can flow out from the flow port 231 and finally flow out from the valve port 140. The stopper 240 is arranged close to the communication hole 212 and is located on the side of the communication hole 212 away from the valve port 140 in the axial direction of the inner cavity 111. The stopper 240 may be a component connected to the inner peripheral wall of the accommodating chamber 211, or may be a convex portion formed by the inner peripheral wall of the accommodating chamber 211 protruding toward the axial direction of the accommodating chamber 211, or may be a clearance groove 2112 formed by the inner peripheral wall of the accommodating chamber 211 being recessed away from the axial direction of the accommodating chamber 211, the clearance groove 2112 being connected to the connecting hole 212, and the clearance groove 2112 is formed on a side wall away from the valve port 140 in the axial direction of the accommodating chamber 211 to form the stopper 240. When the electronic expansion valve 10 is in the small flow regulation stage, the push member 250 moves in the clearance groove 2112 and moves relative to the stopper 240. When the electronic expansion valve 10 is in the full flow regulation stage, the push member 250 pushes the stopper 240 to drive the first valve needle 210 to move away from the valve port 140.

[0062] Different from the previous embodiment, the stopper 240 and the push member 250 in this embodiment are arranged close to the valve port 140 , and the second valve needle 220 is installed into the accommodating cavity 211 from one end close to the valve port 140 .

[0063] In one embodiment, the outer peripheral wall of the second valve needle 220 is provided with a second installation groove 221 , and the push member 250 is disposed in the second installation groove 221 .

[0064] See also Figure 4 and Figure 6The second installation groove 221 is used to install the push member 250 and limit the push member 250 to prevent the push member 250 from shifting, misaligning or slipping off the second valve needle 220 during the movement of the second valve needle 220, thereby affecting the movement of the first valve needle 210. The push member 250 can be a retaining spring, a sleeve, etc.

[0065] In one embodiment, the outer peripheral wall of the second valve needle 220 protrudes outward to form a push member 250 .

[0066] See also Figure 5 The push piece 250 and the second valve needle 220 are integrally formed, ensuring the close connection between the push piece 250 and the second valve needle 220. The push piece 250 and the second valve needle 220 form a more solid and stable overall structure, eliminating the possibility of motion instability and precision loss caused by looseness between parts. At the same time, the manufacturing and assembly process of the push piece 250 and the second valve needle 220 is simplified, reducing the production cost.

[0067] In one embodiment, a riveted portion 213 is disposed at one end of the first valve needle 210 close to the valve port 140 , and the riveted portion 213 is riveted to the first sealing gasket 230 .

[0068] See also Figures 2 to 6 The first sealing gasket 230 is arranged at one end of the accommodating cavity 211 close to the valve port 140 and is fixedly connected by riveting. The riveting process can replace welding, which is pollution-free, non-toxic, harmless, energy-saving and environmentally friendly. By riveting instead of welding, the deformation of the sealing ring 260 caused by welding can be avoided, and the internal leakage will not be affected, which can improve the energy efficiency of the system. In addition, the investment in the riveting process production line equipment is relatively small, and the product equipment amortization is relatively low, which can improve the product gross profit and market competitiveness.

[0069] In one embodiment, the electronic expansion valve 10 further includes a gasket 300 , which is disposed between the first sealing gasket 230 and the riveted portion 213 and riveted to the riveted portion 213 .

[0070] See also Figure 5 and Figure 6 The first sealing gasket 230 can be made of metal or non-metal. For the first sealing gasket 230 made of non-metal, in order to reduce the deformation of the non-metal first sealing gasket 230 during the riveting process, a gasket 300 can be provided at the position where the riveting portion 213 and the non-metal first sealing gasket 230 are riveted, so as to buffer and disperse the riveting force, thereby preventing the deformation of the non-metal first sealing gasket 230 during the riveting process.

[0071] In one embodiment, the electronic expansion valve 10 also includes a nut assembly 400 and a reset member 500. The nut assembly 400 includes a nut body 410 and a screw rod 420. The nut body 410 is disposed at one end of the inner cavity 111 away from the valve port 140. One end of the screw rod 420 is threadedly connected to the nut body 410, and the other end is driven and connected to the second valve needle 220. The reset member 500 is sleeved on the outer periphery of the screw rod 420, with one end abutting the nut body 410 and the other end abutting the first valve needle 210.

[0072] See also Figure 1 The nut body 410 is arranged at one end of the inner cavity 111 away from the valve port 140, one end of the screw rod 420 is connected to the nut body 410 by a thread, and the other end is connected to the second valve needle 220 by a drive connection. When the coil of the driving component applies a certain regular electric pulse to stimulate the rotor component to rotate, the screw rod 420 rotates in the nut body 410 and moves along the axial direction of the electronic expansion valve 10, and the screw rod 420 can push or pull the second valve needle 220, thereby changing the opening of the flow port 231. The reset member 500 is a spring or other elastic element, which is used to provide a restoring force so that the first valve needle 210 can return to the initial position of abutting the valve port 140 when there is no external force.

[0073] The reset member 500 is sleeved on the outer circumference of the screw rod 420, one end of the reset member 500 abuts against the nut body 410, and the other end abuts against the first valve needle 210. When the push member 250 pushes the stopper 240 away from the valve port 140, the reset member 500 is compressed and stores energy; when the second valve needle 220 moves toward the valve port 140, the force of the push member 250 on the stopper 240 disappears, and the reset member 500 releases the stored energy, prompting the first valve needle 210 to return to its original position, thereby realizing the automatic reset function.

[0074] It is worth mentioning that in the valve closing state and the small flow rate adjustment stage, the first valve needle 210 is sealed against the valve port 140 under the action of the reset member 500. At this time, the reset member 500 is also in a compressed state, the first valve needle 210 is not easily affected to shake and shift, and the sealing effect between the first valve needle 210 and the valve port 140 is better. In the full flow adjustment stage, the first valve needle 210 moves away from the valve port 140 driven by the second valve needle 220, the reset member 500 is in a compressed state, and the compression amount increases.

[0075] In one embodiment, the connecting seat assembly 100 includes a connecting seat body 110, a connecting seat sleeve 120 and a second sealing gasket 130. The connecting seat sleeve 120 is arranged at one end of the connecting seat body 110 away from the nut assembly 400, and forms a third installation groove with the connecting seat body 110. The second sealing gasket 130 is arranged in the third installation groove, and the second sealing gasket 130 is annular to form a valve port 140.

[0076] See also Figure 1 , the connection seat assembly 100 includes a connection seat body 110, a connection seat sleeve 120 and a second sealing gasket 130 which are separately arranged. Among them, the connection seat body 110 can be an integrally formed setting, or it can include a first seat body and a second seat body which are separately arranged, the first seat body is connected to the nut body 410, the second seat body is connected to the connection seat sleeve 120, and a third mounting groove is formed with the connection seat sleeve 120, and the third mounting groove is a gap or space formed by the connection seat body 110 and the connection seat sleeve 120, which is used to install the second sealing gasket 130. The third mounting groove effectively fixes the second sealing gasket 130, ensuring the tight connection and stability between the second sealing gasket 130 and the connection seat body 110 or the connection seat sleeve 120. The shape of the second sealing gasket 130 is annular, and a valve port 140 is formed. By setting the connection seat assembly 100 as a split structure, the difficulty of assembling the electronic expansion valve 10 can be reduced, and the convenience of assembly can be improved. In other embodiments, the connection seat assembly 100 can also be an integrally formed setting.

[0077] There is a gap between the outer circumferential wall of the first valve needle 210 and the inner circumferential wall of the inner cavity 111, which is convenient for assembling the first valve needle 210 and the inner cavity 111 on the one hand, and can reduce the interference or friction between the first valve needle 210 and the inner circumferential wall of the inner cavity 111 when the first valve needle 210 moves on the other hand, thereby improving the convenience and sensitivity of the movement of the first valve needle 210. At the same time, since a small gap is formed between the outer circumferential wall of the first valve needle 210 and the inner circumferential wall of the inner cavity 111, the inner circumferential wall of the inner cavity 111 can provide guidance for the movement of the first valve needle 210. The distance between the outer circumferential wall of the first valve needle 210 and the inner circumferential wall of the inner cavity 111 is L2, 0.02mm≤L2≤0.12mm.

[0078] At least one of the first valve needle 210 and the second sealing gasket 130 is made of plastic material; at least one of the second valve needle 220 and the first sealing gasket 230 is made of plastic material.

[0079] In one embodiment, at least one of the first valve needle 210 and the second valve needle 220 is provided with a balancing hole 290 penetrating along the axial direction thereof, and the balancing hole 290 is communicated with the valve port 140 .

[0080] See also Figure 5 At least one of the first valve needle 210 and the second valve needle 220 is provided with a balancing hole 290 penetrating along its axial direction. The balancing hole 290 can balance the pressure difference force at both ends of the valve needle assembly 200 in the axial direction. When the electronic expansion valve 10 is running and the valve is opened and closed, the pressure difference force at both ends of the axial direction of the first valve needle 210 or the second valve needle 220 is zero, which can reduce the driving resistance. A plurality of balancing holes 290 can be provided.

[0081] The utility model also proposes a refrigeration device, which includes an electronic expansion valve 10. The specific structure of the electronic expansion valve 10 refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0082] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising a connection seat assembly and a valve needle assembly, wherein the connection seat assembly has an inner cavity and a valve port communicating with the inner cavity, and the valve needle assembly is disposed in the inner cavity, characterized in that: The valve needle assembly comprises: A first valve needle has an accommodating cavity extending through the first valve needle in its axial direction, wherein a stopper is provided on an inner wall of the accommodating cavity, and the first valve needle is used to open or close the valve port; a first sealing gasket, disposed at one end of the accommodating cavity close to the valve port, the first sealing gasket being provided with a flow port, the flow port being in communication with the accommodating cavity and the valve port; and The second valve needle is inserted into the accommodating cavity, and a push piece is provided on the outer wall of the second valve needle. The push piece can move relative to the stop piece along the axial direction of the accommodating cavity to open or close the flow port. The push piece can also push the stop piece to move away from the valve port to enable the first valve needle to open the valve port.

2. The electronic expansion valve according to claim 1, characterized in that: There is a gap between the outer circumferential wall of the second valve needle and the inner circumferential wall of the accommodating cavity. The valve needle assembly also includes a sealing ring. One of the outer circumferential wall of the second valve needle and the inner circumferential wall of the accommodating cavity is provided with a first mounting groove. The sealing ring is arranged in the first mounting groove and abuts against the other.

3. The electronic expansion valve according to claim 2, characterized in that: The first installation groove is formed on the inner peripheral wall of the accommodating cavity. The valve needle assembly further includes a limiting member, which is connected to the inner peripheral wall of the accommodating cavity and limits the sealing ring in the first installation groove.

4. The electronic expansion valve according to claim 3, characterized in that: The stop member and the push member are arranged at one end of the accommodating cavity away from the valve port, the stop member includes a main body and a stop member, one end of the main body close to the valve port abuts against the limiting member, and the other end of the main body away from the valve port is connected to the stop member, the push member is arranged between the limiting member and the stop member, and can push the stop member.

5. The electronic expansion valve according to claim 3, characterized in that: The inner circumferential wall of the accommodating cavity is formed with a step surface, one end of the stop member close to the valve port abuts against the step surface, and the other end of the stop member away from the valve port is riveted to the end of the first valve needle; there is a distance between the limit member and the stop member, and the push member is arranged between the limit member and the stop member, and the limit member is riveted to the inner circumferential wall of the accommodating cavity.

6. The electronic expansion valve according to claim 1, characterized in that: The first valve needle is provided with a connecting hole, which is connected with the inner cavity and the accommodating cavity. The stopper is located on the side of the connecting hole in the axial direction of the inner cavity away from the valve port, and is formed with the inner wall of the accommodating cavity with a clearance groove connected with the connecting hole. When the push member pushes the stopper, the push member is located in the clearance groove.

7. The electronic expansion valve according to claim 6, characterized in that: The outer peripheral wall of the second valve needle is provided with a second mounting groove, and the push member is arranged in the second mounting groove.

8. The electronic expansion valve according to claim 6, characterized in that: The outer peripheral wall of the second valve needle protrudes outward to form the push member.

9. The electronic expansion valve according to claim 7 or 8, characterized in that: A riveted portion is provided at one end of the first valve needle close to the valve port, and the riveted portion is riveted to the first sealing gasket.

10. The electronic expansion valve according to claim 9, characterized in that: The electronic expansion valve further includes a gasket, which is arranged between the first sealing pad and the riveted portion and riveted to the riveted portion.

11. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve also includes a nut assembly and a reset member. The nut assembly includes a nut body and a screw. The nut body is arranged at one end of the inner cavity away from the valve port. One end of the screw is threadedly connected to the nut body, and the other end is drivingly connected to the second valve needle. The reset member is sleeved on the outer periphery of the screw, with one end abutting the nut body and the other end abutting the first valve needle.

12. The electronic expansion valve according to claim 11, characterized in that: The connecting seat assembly includes a connecting seat body, a connecting seat sleeve and a second sealing gasket. The connecting seat sleeve is arranged at one end of the connecting seat body away from the nut assembly and forms a third mounting groove with the connecting seat body. The second sealing gasket is arranged in the third mounting groove. The second sealing gasket is annular to form the valve port.

13. The electronic expansion valve according to claim 1, characterized in that: At least one of the first valve needle and the second valve needle is provided with a balancing hole penetrating along the axial direction thereof, and the balancing hole is communicated with the valve port.

14. A refrigeration device, characterized in that: Comprising the electronic expansion valve as claimed in any one of claims 1 to 13.

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