Valve element assembly and electronic expansion valve

Abstract

The utility model discloses a valve element assembly and an electronic expansion valve. The valve element assembly comprises a first component, a second component and a first elastic piece. One of the first component and the second component is provided with a connecting hole, the other one is provided with a connecting shaft used for being inserted into the connecting hole, and at least part of the first elastic piece is located in the connecting hole and can abut against the connecting shaft; when the axial size of the connecting shaft inserted into the connecting hole is smaller than or equal to a first target value, the first elastic piece is in an original length state.

Description

Technical Field

[0001] The present application relates to the technical field of valves. Specifically, it relates to a valve core assembly and an electronic expansion valve including the valve core assembly. Background Art

[0002] An electronic expansion valve is a device used to control the refrigerant flow rate in a refrigeration cycle, and is usually used in refrigeration and air conditioning systems. It is an expansion valve that adjusts the refrigerant flow rate through an electronic control method to ensure the normal operation and high efficiency of the refrigeration system.

[0003] The electronic expansion valve includes a valve core assembly and a valve seat assembly. The valve seat assembly has a valve port, and the valve core assembly is movably arranged inside the valve seat assembly for adjusting the opening degree of the valve port or switching the flow path.

[0004] In order to improve the sealing performance of the valve core assembly for blocking the valve port, the electronic expansion valves in the related art often set a pre-tightening spring. When the valve core assembly blocks the valve port, the pre-tightening spring provides a pre-tightening force to make the valve core assembly tightly block the valve port. However, after adding the pre-tightening spring, it will cause inconvenience in installing the valve core assembly and low installation efficiency. Summary of the Utility Model

[0005] The embodiments of the present application provide a valve core assembly and an electronic expansion valve to solve the problems of inconvenient installation and low installation efficiency of the valve core assembly in the related art.

[0006] The valve core assembly of the embodiments of the present application includes a first component, a second component, and a first elastic member;

[0007] One of the first component and the second component has a connection hole, and the other has a connection shaft for inserting into the connection hole. At least part of the first elastic member is located in the connection hole and can be abutted by the connection shaft;

[0008] When the axial dimension of the connection shaft inserted into the connection hole is less than or equal to a first target value, the first elastic member is in its original length state.

[0009] According to some embodiments of the present application, the connection shaft includes a first mating section. When the axial dimension of the connection shaft inserted into the connection hole is less than or equal to the first target value, at least part of the first mating section is located in the connection hole, and the first mating section has a clearance fit with the inner wall of the connection hole.

[0010] According to some embodiments of the present application, the connecting shaft further includes a second mating section that forms a stepped surface with the first mating section. When the axial dimension of the connecting shaft inserted into the connecting hole is greater than the first target value, the entire first mating section is located within the connecting hole, and the first mating section has a clearance fit with the inner wall of the connecting hole. At least a portion of the second mating section is located within the connecting hole, and the second mating section has an interference fit with the inner wall of the connecting hole.

[0011] According to some embodiments of the present application, one of the first component and the second component further has a fourth stop portion for stopping the other of the first component and the second component when the axial dimension of the connecting shaft inserted into the connecting hole reaches a second target value;

[0012] Wherein, the second target value is greater than the first target value.

[0013] According to some embodiments of the present application, the fourth stop portion is an annular protrusion that surrounds the outer peripheral surface of the connecting shaft and is used to abut against the periphery of the connecting hole.

[0014] According to some embodiments of the present application, one end of the connecting shaft has an end face;

[0015] The connecting shaft further has a receiving groove that recesses from the end face along the axial direction of the connecting shaft towards the other end of the connecting shaft;

[0016] At least a portion of the first elastic member is located within the receiving groove.

[0017] According to some embodiments of the present application, the second component is a first valve sleeve that has the connecting hole. A first stop portion is convexly provided on the inner peripheral surface of the first valve sleeve, and the first stop portion and the end face of the connecting shaft are arranged at an interval along the axial direction of the connecting shaft;

[0018] The valve core assembly further includes a second valve core. A flange is provided on a portion of the second valve core extending into the first valve sleeve, and the flange is located between the first stop portion and the end face and is used to compress the first elastic member or contact the first stop portion.

[0019] According to some embodiments of the present application, when the axial dimension of the connecting shaft inserted into the connecting hole is greater than or equal to the first target value, one end of the first elastic member abuts against the second valve core, and the other end abuts against the connecting shaft.

[0020] According to some embodiments of the present application, the second valve core includes:

[0021] A valve core seat, at least a portion of which is disposed within the first valve sleeve and has the flange; and

[0022] A second valve sleeve, with one axial end of the second valve sleeve fixedly connected to the valve core seat.

[0023] The electronic expansion valve according to the embodiment of the present application includes the valve core assembly described in any one of the above.

[0024] One embodiment of the above application has at least the following advantages or beneficial effects:

[0025] In the valve core assembly and the electronic expansion valve according to the embodiment of the present application, when the axial dimension of the connecting shaft inserted into the connecting hole is less than or equal to the first target value, the first elastic member is in its original length state. At this time, the first elastic member does not generate an elastic force. That is to say, in the initial stage when the connecting shaft is inserted into the connecting hole, the connecting shaft will not be subjected to the reaction force provided by the first elastic force, improving the smoothness of inserting the connecting shaft into the connecting hole and thus improving the assembly efficiency. Description of the Drawings

[0026] Figure 1 The side view schematic diagram of the electronic expansion valve according to the first embodiment of the present application is shown.

[0027] Figure 2 The three-dimensional schematic diagram of the electronic expansion valve according to the first embodiment of the present application is shown.

[0028] Figure 3 Shown is along Figure 1 The cross-sectional view taken along the A-A cutting line.

[0029] Figure 4 The schematic diagram when the first valve core and the second valve core are not installed in place is shown.

[0030] Figure 5 Shown is Figure 4 The exploded schematic diagram.

[0031] Figure 6 Shown is along Figure 4 The cross-sectional view taken along the B-B cutting line.

[0032] Figure 7 The cross-sectional view of the electronic expansion valve according to the second embodiment of the present application is shown.

[0033] Figure 8 Shown is Figure 7 The three-dimensional schematic diagram of the guiding portion in

[0034] Figure 9 The cross-sectional view of the electronic expansion valve according to the third embodiment of the present application is shown.

[0035] Figure 10 Shown is Figure 9 The three-dimensional schematic diagram of the second guiding rod in

[0036] Figure 11 Shown is a cross-sectional view of the electronic expansion valve according to the fourth embodiment of the present application.

[0037] Figure 12 Shown is Figure 11 a three-dimensional schematic diagram of the second guide rod in

[0038] Figure 13 Shown is a cross-sectional view of the electronic expansion valve according to the fifth embodiment of the present application.

[0039] Figure 14 Shown is a cross-sectional view of the electronic expansion valve according to the sixth embodiment of the present application.

[0040] Figure 15 Shown is a cross-sectional view of the electronic expansion valve according to the seventh embodiment of the present application. Detailed implementation manners

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0042] It can be understood that the terms "include" and "have" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or components inherent to these processes, methods, products, or devices.

[0043] As Figures 1 to 3 shown, the electronic expansion valve according to the first embodiment of the present application includes a valve seat assembly 100, a valve core assembly 200, a rotor assembly 810, an outer cover 820, a nut seat 830, and a screw rod 300.

[0044] The valve seat assembly 100 has a valve cavity 110, at least a part of the valve core assembly 200 is disposed in the valve cavity 110, and is movable relative to the valve seat assembly 100 along the axial direction of the electronic expansion valve. The outer cover 820 is fixedly connected to the valve seat assembly 100, for example, by welding, but not limited thereto. The rotor assembly 810 is movably disposed in the outer cover 820 and is used to be coupled to a coil assembly (not shown in the figure) sleeved on the outer periphery of the outer cover 820. The nut seat 830 is fixedly connected to the valve seat assembly 100 and is disposed in the outer cover 820. The screw rod 300 is disposed in the outer cover 820, is connected to the rotor assembly 810, and is screwed to the nut seat 830.

[0045] When the electronic expansion valve is working, by applying a pulse signal to the coil assembly, the rotor assembly 810 can be driven to drive the screw 300 to rotate. Since the nut seat 830 is fixed and screwed to the screw 300, the screw 300 can reciprocate axially along the electronic expansion valve, thereby driving the valve core assembly 200 to move relative to the valve seat assembly 100 within the valve cavity 110.

[0046] The valve seat assembly 100 may include a first valve seat 120, a second valve seat 130, and a third valve seat 150. Along the axial direction of the electronic expansion valve, the first valve seat 120, the second valve seat 130, and the third valve seat 150 are connected in sequence and jointly enclose the valve cavity 110.

[0047] The valve seat assembly 100 has a first opening 103, a second opening 104, and a third opening 105 that communicate with the valve cavity 110. The first opening 103, the second opening 104, and the third opening 105 are arranged in sequence along the axial direction of the electronic expansion valve. The wall of the valve cavity 110 has a valve port 110a. It can be understood that the number of valve ports 110a can be one or more. When the number of valve ports 110a is two, the two valve ports 110a are respectively defined as a first valve port 101 and a second valve port 102. Among them, the first valve port 101 is located between the second opening 104 and the third opening 105, and the second valve port 102 is located between the second opening 104 and the first opening 103.

[0048] In the embodiment of the present application, the second valve seat 130 has a first opening 103, a second opening 104, and a second valve port 102, and the third valve seat 150 has a third opening 105 and a first valve port 101, but it is not limited thereto.

[0049] As Figures 3 to 6 shown, the valve core assembly 200 includes a first valve core 210, a second valve core 220, and a first elastic member 230. The first valve core 210 is movable between a first position blocking the first valve port 101 and a second position blocking the second valve port 102. The second valve core 220 is used to drive the first valve core 210 to move; the first elastic member 230 is connected between the first valve core 210 and the second valve core 220; after the first valve core 210 is in the first position, the second valve core 220 can move relative to the first valve core 210 in a direction closer to the first valve port 101, so that the compression amount of the first elastic member 230 increases and is used to apply a first pre-tightening force to the first valve core 210 to block the first valve port 101. The screw 300 is used to drive the second valve core 220 to move axially along the electronic expansion valve.

[0050] The electronic expansion valve further includes a second elastic member 500. The second elastic member 500 is connected to the second valve core 220 and the screw rod 300. After the first valve core 210 is in the second position, the screw rod can move relative to the first valve core 210 in a direction away from the second valve port 102, so that the compression amount of the second elastic member 500 increases and is used to apply a second pre-tightening force for blocking the second valve port 102 to the first valve core 210 through the second valve core 220.

[0051] The electronic expansion valve according to the embodiment of the present application includes a first elastic member 230 and a second elastic member 500. The first elastic member 230 can apply a first pre-tightening force for blocking the first valve port 101 to the first valve core 210, and the second elastic member 500 can apply a second pre-tightening force for blocking the second valve port 102 to the first valve core 210. In this way, the sealing performance of the first valve core 210 for blocking the first valve port 101 or the second valve port 102 is significantly improved, preventing fluid leakage of the electronic expansion valve and improving the working reliability. In addition, for the electronic expansion valve according to the embodiment of the present application, the screw rod 300 drives the first valve core 210 to move between the first position and the second position through the second valve core 220. Moreover, the first pre-tightening force provided by the first elastic member 230 acts on the first valve core 210 and the second valve core 220 respectively, and the second pre-tightening force provided by the second elastic member 500 acts on the screw rod 300 and the second valve core 220 respectively, so that the first pre-tightening force and the second pre-tightening force do not affect each other, ensuring that the first pre-tightening force and the second pre-tightening force are large enough, and further improving the sealing performance when the first valve core 210 blocks the first valve port 101 and the second valve port 102.

[0052] In one embodiment, the first elastic member 230 and the second elastic member 500 can be compression springs, but not limited thereto. For example, the first elastic member 230 and the second elastic member 500 can also be rubber parts or other components that can provide elastic force when compressed.

[0053] As Figure 3 、 Figure 5 and Figure 6 shown, the first valve core 210 includes a first component and a second component, and the first component and the second component are connected with an interference fit. In the embodiment of the present application, the first component is a valve needle 211, and the second component is a first valve sleeve 212. The valve needle 211 is used to block the first valve port 101 or the second valve port 102. At least part of the first valve sleeve 212 is sleeved on the outer periphery of the valve needle 211 and is fixedly connected to the valve needle 211; wherein, the first valve sleeve 212 is connected with the second valve core 220 in a limiting manner, so that the first valve core 210 moves from the first position to the second position.

[0054] The portion of the valve needle 211 surrounded by the first valve sleeve 212 has an end face 2111. A first stop portion 2121 is protruded on the inner peripheral surface of the first valve sleeve 212, and the first stop portion 2121 and the end face 2111 are arranged at intervals along the axial direction of the electronic expansion valve. A flange 2211 is provided on the portion of the second valve core 220 extending into the first valve sleeve 212, and the flange 2211 is movable between the first stop portion 2121 and the end face 2111 to compress the first elastic member 230; the flange 2211 can also pull the first stop portion 2121 to move the first valve core 210 from the first position to the second position.

[0055] The second valve core 220 includes a valve core seat 221 and a second valve sleeve 222. One axial end of the second valve sleeve 222 is fixedly connected to the valve core seat 221, such as by welding, screwing, interference fit, etc. At least a part of the valve core seat 221 is arranged inside the first valve core 210 and is used to pull the first valve core 210 to move from the first position to the second position, or to compress the first elastic member 230. One end of the second elastic member 500 and the screw 300 are arranged inside the second valve sleeve 222. Wherein, the valve core seat 221 has a flange 2211, and the flange 2211 can move between the first stop portion 2121 and the end face 2111. When the flange 2211 moves towards the direction close to the first valve port 101, it can compress the first elastic member 230. When the flange 2211 moves away from the first valve port 101, it can pull the first stop portion 2121 to move the first valve core 210 from the first position to the second position.

[0056] The inner peripheral surface of the second valve sleeve 222 has a second stop portion 2221. The screw 300 includes a rod portion 310 and a third stop portion 320. The rod portion 310 is screwed to the nut seat 830. The third stop portion 320 is connected to one end of the rod portion 310 and is located inside the second valve sleeve 222 and is movable between the second stop portion 2221 and the valve core seat 221; one end of the second elastic member 500 abuts against the second stop portion 2221, and the other end abuts against the third stop portion 320.

[0057] As Figure 3 and Figure 6 shown, the third stop portion 320 includes a bearing 321 and a protection piece 322. The inner ring of the bearing 321 is sleeved on the outer periphery of the rod portion 310 and is fixedly connected to the rod portion 310; the protection piece 322 is arranged on the side of the bearing 321 facing the second stop portion 2221, and the other end of the second elastic member 500 abuts against the protection piece 322.

[0058] In the embodiment of the present application, the protection piece 322 can play a role in protecting the bearing 321 and prevent the second elastic member 500 from directly abutting on the bearing 321 and causing the bearing 321 to deform.

[0059] The valve needle 211 has a receiving groove 2112 that is recessed from the end face 2111 along the axial direction of the electronic expansion valve away from the second valve core 220; the first elastic member 230 is received in the receiving groove 2112, one end of the first elastic member 230 abuts against the bottom surface of the receiving groove 2112, and the other end abuts against the second valve core 220.

[0060] In the embodiment of the present application, the receiving groove 2112 can play a role in limiting the first elastic member 230, preventing the elastic pre-tightening force provided by the first elastic member 230 from being affected due to the change in the position of the first elastic member 230.

[0061] In one embodiment, the valve needle 211 is in interference fit with the first valve sleeve 212. For example, the portion of the valve needle 211 surrounded by the first valve sleeve 212 has a first fitting section 2113 and a second fitting section 2114. The first fitting section 2113 and the second fitting section 2114 are arranged along the axial direction of the electronic expansion valve, and the first fitting section 2113 is closer to the second valve core 220 than the second fitting section 2114; the first fitting section 2113 is in clearance fit with the inner peripheral surface of the first valve sleeve 212, and the second fitting section 2114 is in interference fit with the inner peripheral surface of the first valve sleeve 212.

[0062] Of course, in other embodiments, the valve needle 211 and the first valve sleeve 212 can also be connected by welding, screwing, etc.

[0063] The following combines Figure 3 to describe in detail the movement process of the valve core assembly 200, and how the first elastic member 230 and the second elastic member 500 provide elastic pre-tightening force.

[0064] The process of the first valve core 210 blocking the first valve port 101: The rotor assembly 810 drives the screw 300 to rotate. Under the screw-thread fit between the screw 300 and the nut seat 830, the screw 300 moves downward as a whole. During the downward movement of the screw 300, the bearing 321 of the screw 300 presses against the valve core seat 221, causing the valve needle 211 to move in the direction of blocking the first valve port 101. When the valve needle 211 blocks the first valve port 101 (the first position), the valve needle 211 stops moving, and at this time the valve core seat 221 continues to move downward. The first elastic member 230 is compressed by the valve core seat 221 and the compression amount increases to provide the first pre-tightening force. Under the action of the first pre-tightening force, the valve needle 211 can tightly block the first valve port 101, improving the sealing performance of the valve needle 211 blocking the first valve port 101.

[0065] The process of the first valve core 210 blocking the second valve port 102: The rotor assembly 810 drives the screw 300 to rotate in the reverse direction. Under the thread engagement between the screw 300 and the nut seat 830, the screw 300 drives the second valve core 220 to move upward through the second elastic member 500. During the upward movement of the second valve core 220, the flange 2211 contacts the first stop portion 2121 of the first valve sleeve 212. Then, the second valve core 220 can drive the first valve core 210 to move to the second position. When the first valve core 210 moves to the second position, the first valve core 210 cannot continue to move upward. Under the action of the first stop portion 2121 blocking the flange 2211, the second valve core 220 also cannot continue to move upward. At this time, the screw 300 can continue to move upward under the drive of the rotor assembly 810. During the continuous movement of the screw 300, the third stop portion 320 of the screw 300 presses the second elastic member 500, causing the compression amount of the second elastic member 500 to increase and generating a second pre-tightening force. The second pre-tightening force can continuously abut against the second stop portion 2221 of the second valve sleeve 222, so that the second valve core 220 continuously provides an upward pulling force for the first valve core 210 to maintain the state of the first valve core 210 blocking the second valve port 102. It can be seen that under the action of the second pre-tightening force, the valve needle 211 can tightly block the second valve port 102, improving the sealing performance of the valve needle 211 blocking the second valve port 102.

[0066] As Figure 3 shown, there is an active gap between the valve core seat 221 and the end face 2111 of the valve needle 211 along the axial direction of the electronic expansion valve. This active gap is used to adjust the opening valve pulse number of the electronic expansion valve. Specifically, by setting the size of this active gap, the opening valve pulse number of the device can be adjusted according to the actual situation.

[0067] As Figure 3 shown, a first inner sealing ring 140 is also provided between the valve core assembly 200 and the cavity wall of the valve cavity 110. The first valve sleeve 212 of the first valve core 210 is movably and sealingly engaged with the cavity wall of the valve cavity 110 through the first inner sealing ring 140, and the sealing position between the first valve core 210 and the cavity wall of the valve cavity 110 forms a first sealing ring. The first valve core 210 has a second inner sealing ring 213. The position where the second inner sealing ring 213 seals with the first valve port 101 forms a second sealing ring, and the position where the second inner sealing ring 213 seals with the second valve port 102 forms a third sealing ring. The diameter D2 of the second sealing ring is greater than the diameter D1 of the first sealing ring, and the diameter D3 of the third sealing ring is greater than the diameter D1 of the first sealing ring.

[0068] It can be understood that designing the diameter D2 of the second sealing ring to be greater than the diameter D1 of the first sealing ring and the diameter D3 of the third sealing ring to be greater than the diameter D1 of the first sealing ring facilitates the installation of the valve core assembly 200 into the valve cavity 110 from the bottom of the valve seat assembly 100.

[0069] However, such a design causes the overall electronic expansion valve to no longer maintain internal balance, that is, the valve core assembly 200 is no longer balanced under the action of the fluid.

[0070] For this reason, in the electronic expansion valve of the embodiment of the present application, the relationship between the first pre-tightening force F1 and D2, D1 satisfies the following inequality (π×D2 2 ÷4 - π×D1 2 ÷4)×ΔP1 < F1; where D2 is the diameter of the second sealing ring, D1 is the diameter of the first sealing ring, and ΔP1 is the fluid pressure difference between the third opening 105 and the second opening 104 when the fluid is introduced into the electronic expansion valve.

[0071] The second pre-tightening force F2 and D3, D1 satisfy the following inequality: (π×D3 2 ÷4 - π×D1 2 ÷4)×ΔP2 < F2; where D3 is the diameter of the third sealing ring, D1 is the diameter of the first sealing ring, and ΔP2 is the fluid pressure difference between the first opening 103 and the second opening 104 when the fluid is introduced into the electronic expansion valve.

[0072] In the embodiment of the present application, F1, D1 and D2 satisfy (π×D2 2 ÷4 - π×D1 2 ÷4)×ΔP1 < F1, which can prevent fluid leakage caused by the valve needle 211 being pushed open by the reverse acting force of the fluid; similarly, F2, D1 and D3 satisfy (π×D3 2 ÷4 - π×D1 2 ÷4)×ΔP2 < F2, which can prevent fluid leakage caused by the valve needle 211 being pushed open by the reverse acting force of the fluid.

[0073] Specifically, it is set that the second opening 104 of the valve seat assembly 100 is the fluid inlet, and the first opening 103 and the third opening 105 are the fluid outlets. When the valve needle 211 blocks the first valve port 101, the fluid enters from the second opening 104 and flows out from the first opening 103. At this time, the upper space of the second inner sealing ring 213 (i.e., the chamber corresponding to the second opening 104 and the first opening 103) is the high-pressure chamber, and the lower space of the second inner sealing ring 213 (i.e., the chamber corresponding to the third opening 105) is the low-pressure chamber. Under normal circumstances, the fluid enters from the second opening 104 and flows out from the first opening 103. At this time, the valve needle 211 is subjected to a downward fluid pressure, and the valve needle 211 will not be pushed open by the fluid. However, in abnormal circumstances, if the fluid suddenly enters from the third opening 105, the pressure formed by the fluid is (π×D2 2 ÷4 - π×D1 2 ÷4)×ΔP1, and the direction of the pressure is upward.

[0074] It can be seen that the first pre-tightening force F1 provided by the first elastic member 230 in the embodiment of the present application is greater than (π×D2 2 ÷4 - π×D1 2 ÷4)×ΔP1, which can effectively prevent the fluid pressure from pushing the valve needle 211 open and ensure the sealing performance of the valve needle 211 blocking the first valve port 101.

[0075] Similarly, when the valve needle 211 blocks the second valve port 102, the fluid enters from the second opening 104 and flows out from the third opening 105. At this time, the upper space of the second inner sealing ring 213 (i.e., the chamber corresponding to the first opening 103) is a low-pressure chamber, and the lower space of the second inner sealing ring 213 (i.e., the chambers corresponding to the second opening 104 and the third opening 105) is a high-pressure chamber. Under normal circumstances, the fluid enters from the second opening 104 and flows out from the third opening 105. At this time, the valve needle 211 is subjected to an upward fluid pressure, and the valve needle 211 will not be pushed open by the fluid. However, in abnormal circumstances, if the fluid suddenly enters from the first opening 103, the pressure formed by the fluid is (π×D3 2 ÷4 - π×D1 2 ÷4)×ΔP2, and the direction of the pressure is downward.

[0076] It can be seen that the second pre-tightening force F2 provided by the second elastic member 500 in the embodiment of the present application is greater than (π×D3 2 ÷4 - π×D1 2 ÷4)×ΔP2, which can effectively prevent the fluid pressure from pushing the valve needle 211 open and ensure the sealing performance of the valve needle 211 blocking the second valve port 102.

[0077] As Figure 3 shown, the first inner sealing ring 140 includes an outer sealing ring 141 and an inner sealing ring 142. The inner sealing ring 142 is sleeved on the outer periphery of the first valve sleeve 212. The outer sealing ring 141 surrounds the outer periphery of the inner sealing ring 142 and applies an elastic pre-tightening force towards the first valve sleeve 212 to the inner sealing ring 142. The combined sealing structure of the outer sealing ring 141 and the inner sealing ring 142 can improve the high-pressure resistance and wear resistance of the dynamic seal.

[0078] In one embodiment, the material of the inner sealing ring 142 can be polytetrafluoroethylene, but it is not limited thereto.

[0079] It can be understood that the diameter D1 of the first sealing ring is the outer diameter dimension of the first valve sleeve 212. The diameter D2 of the second sealing ring is the diameter of the circle formed by the tangent points between the R corner at the edge of the first valve port 101 and the lower inclined surface of the second inner sealing ring 213. The diameter D3 of the third sealing ring is the diameter of the circle formed by the tangent points between the R corner at the edge of the second valve port 102 and the upper inclined surface of the second inner sealing ring 213.

[0080] Further, in order to reduce the difference between D2 and D1, as well as the difference between D3 and D1, so that the electronic expansion valve can tend to internal balance as much as possible, it can be achieved by reducing the R angle at the edge of the first valve port 101, increasing the taper of the lower inclined surface of the second inner sealing ring 213, reducing the R angle at the edge of the second valve port 102, and increasing the taper of the upper inclined surface of the second inner sealing ring 213.

[0081] In one embodiment, the second inner sealing ring 213 is made of a flexible sealing material, such as rubber, polymer, plastic, etc. In this way, the sealing performance of the second inner sealing ring 213 when blocking the first valve port 101 or the second valve port 102 can be improved, and leakage can be prevented.

[0082] When the first valve port 101 is closed, at least a part of the lower inclined surface of the second inner sealing ring 213 is located inside the first valve port 101, which can ensure that when the valve core assembly 200 is skewed, the valve core assembly 200 can be aligned through the lower inclined surface of the second inner sealing ring 213. When the second valve port 102 is closed, at least a part of the upper inclined surface of the second inner sealing ring 213 is located inside the second valve port 102, which can ensure that when the valve core assembly 200 is skewed, the valve core assembly 200 can be aligned through the upper inclined surface of the second inner sealing ring 213.

[0083] As Figure 3 shown, the inner peripheral surface of one of the first valve seat 120 and the second valve seat 130 is in guiding fit with the outer peripheral surface of the first valve sleeve 212, and there is a first gap between the inner peripheral surface and the outer peripheral surface, and there is a second gap between the inner peripheral surface of the other and the outer peripheral surface of the first valve sleeve 212; the first gap is smaller than the second gap.

[0084] For example, the inner peripheral surface of the first valve seat 120 is in clearance fit with the outer peripheral surface of the first valve sleeve 212, and there is a second gap between the inner peripheral surface and the outer peripheral surface; the inner peripheral surface of the second valve seat 130 is in guiding fit with the outer peripheral surface of the first valve sleeve 212, and there is a first gap between the inner peripheral surface and the outer peripheral surface.

[0085] Of course, in other embodiments, it may also be that: the inner peripheral surface of the first valve seat 120 is in guiding fit with the outer peripheral surface of the first valve sleeve 212, and the inner peripheral surface of the second valve seat 130 is in clearance fit with the outer peripheral surface of the first valve sleeve 212.

[0086] It can be seen that only one valve seat in the valve seat assembly 100 has a small-gap guiding fit between its inner peripheral surface and the outer peripheral surface of the first valve sleeve 212, and the remaining valve seats maintain a large clearance fit. In this way, it can be avoided that the valve core assembly 200 gets stuck during movement due to the inner peripheral surfaces of the valve seat assembly 100 being all designed for guiding fit.

[0087] As Figure 6As shown, one of the valve needle 211 and the first valve sleeve 212 has a connection hole 212a, and the other has a connection shaft 211a for inserting into the connection hole 212a. At least part of the first elastic member 230 is located in the connection hole 212a and can be abutted by the connection shaft 211a. When the axial dimension of the connection shaft 211a inserted into the connection hole 212a is less than or equal to the first target value, the first elastic member 230 is in its original length state.

[0088] When assembling the valve core assembly 200 according to the embodiment of the present application, first insert the second valve core 220 and the screw 300 into the first valve sleeve 212, then install the first elastic member 230 into the first valve sleeve 212, and finally connect the valve needle 211 and the first valve sleeve 212 to enclose the first elastic member 230 in the first valve sleeve 212. When connecting the valve needle 211 and the first valve sleeve 212, first insert the connection shaft 211a into the connection hole 212a. When the axial dimension of the part of the connection shaft 211a inserted into the connection hole 212a is less than or equal to the first target value, the first elastic member 230 is in its original length state. On the one hand, the inner wall surface of the connection hole 212a can play a guiding role to guide the connection shaft 211a to insert into the connection hole 212a; on the other hand, since the first elastic member 230 is in its original length state when the axial dimension of the connection shaft 211a inserted into the connection hole 212a is less than or equal to the first target value, at this time the first elastic member 230 does not generate elastic force, that is to say, in the initial stage of inserting the connection shaft 211a into the connection hole 212a, the connection shaft 211a will not be subjected to the reaction force provided by the first elastic force, improving the smoothness of inserting the connection shaft 211a into the connection hole 212a, and thus improving the assembly efficiency.

[0089] In one embodiment, the first target value is greater than or equal to 0.5 mm, but not limited thereto.

[0090] When the connection shaft 211a and the connection hole 212a are in interference fit, one end of the first elastic member 230 abuts against the second valve core 220, and the other end abuts against the connection shaft 211a.

[0091] In one embodiment, the valve needle 211 has a connection shaft 211a, and the first valve sleeve 212 has a connection hole 212a. Of course, in other embodiments, the valve needle 211 has a connection hole 212a, and the first valve sleeve 212 has a connection shaft 211a.

[0092] Next, an example will be given with the valve needle 211 having a connection shaft 211a and the first valve sleeve 212 having a connection hole 212a.

[0093] As Figure 6 shown, one of the outer peripheral surface of the connection shaft 211a and the inner wall surface of the connection hole 212a has a stepped surface, and the other has a surface that is in clearance fit or interference fit with the stepped surface.

[0094] In one embodiment, the connecting shaft 211a has a first mating section 2113 and a second mating section 2114. The first mating section 2113 and the second mating section 2114 are arranged along the axial direction of the connecting shaft 211a and form a stepped surface. The first mating section 2113 is used for clearance fit with the inner wall surface of the connecting hole 212a, and the second mating section 2114 is used for interference fit with the inner wall surface of the connecting hole 212a.

[0095] Wherein, when the axial dimension of the connecting shaft 211a inserted into the connecting hole 212a is less than or equal to a first target value, at least a part of the first mating section 2113 is located inside the connecting hole 212a, and the first mating section 2113 has a clearance fit with the inner wall of the connecting hole 212a. When the axial dimension of the connecting shaft 211a inserted into the connecting hole 212a is greater than or equal to the first target value, the entire first mating section 2113 is located inside the connecting hole 212a, the first mating section 2113 has a clearance fit with the inner wall of the connecting hole 212a, at least a part of the second mating section 2114 is located inside the connecting hole 212a, and the second mating section 2114 has an interference fit with the inner wall of the connecting hole 212a.

[0096] In another embodiment, the inner wall surface of the connecting hole 212a has a stepped surface, and the outer peripheral surface of the connecting shaft 211a has a surface that first has a clearance fit and then an interference fit with the stepped surface.

[0097] As Figure 6 shown, the valve needle 211 further has a fourth stop portion 2115, which is used to stop the other one of the first component and the second component when the connecting shaft 211a and the connecting hole 212a are in interference fit and the axial dimension of the part of the connecting shaft 211a inserted into the connecting hole 212a reaches a second target value; wherein, the second target value is greater than the first target value. By providing the fourth stop portion 2115 on the valve needle 211, it is possible to prevent the dimension of the connecting shaft 211a inserted into the connecting hole 212a from being too long during the assembly of the valve needle 211 and the first valve sleeve 212, resulting in inconvenient disassembly.

[0098] Of course, in other embodiments, when the valve needle 211 has the connecting hole 212a and the first valve sleeve 212 has the connecting shaft 211a, the fourth stop portion 2115 can be provided on the first valve sleeve 212.

[0099] In one embodiment, the fourth stop portion 2115 is an annular protrusion that surrounds the outer peripheral surface of the connecting shaft 211a and is used to abut against the periphery of the connecting hole 212a.

[0100] In other embodiments, the fourth stop portion 2115 may include a plurality of sub-protrusions and is arranged circumferentially along the connecting shaft 211a.

[0101] As Figure 2 and Figure 3As shown, the top of the valve cavity 110 has a back pressure cavity 111, and the valve core assembly 200 has a first balance channel 201 communicating with the back pressure cavity 111 and the valve port 110a. The electronic expansion valve according to the embodiment of the present application further includes a guiding structure 600 for guiding the movement of the valve core assembly 200 relative to the valve seat assembly 100; the guiding structure 600 has a second balance channel 601 communicating with the first balance channel 201 and the valve port 110a.

[0102] In the embodiment of the present application, the electronic expansion valve includes a guiding structure 600 for guiding the movement of the valve core assembly 200. The guiding structure 600 can effectively avoid the problem that the valve core assembly 200 is prone to tilt and cannot align with the valve port after being impacted by the fluid impact force. In addition, the valve core assembly 200 has a first balance channel 201 communicating with the back pressure cavity 111 and the valve port 110a, and the guiding structure 600 has a second balance channel 601 communicating with the first balance channel 201 and the valve port 110a, so that the electronic expansion valve is an internal balance valve as a whole, improving the ability of opening and closing the valve.

[0103] Among them, in the embodiment of the present application, the valve needle 211 and the valve core seat 221 of the valve core assembly 200 have mutually communicating channels, and the valve core seat 221 has an opening communicating with the channel of the valve core seat 221. Each channel and the opening together constitute the first balance channel 201.

[0104] As Figure 2 and Figure 3 shown, the guiding structure 600 includes a connecting portion 610 and a guiding portion 620. The connecting portion 610 is connected to the cavity wall of the valve cavity 110 and has a second balance channel 601; the guiding portion 620 is connected to one of the connecting portion 610 and the valve core assembly 200 and is in guiding cooperation with the other. In one embodiment, the connecting portion 610 has a plurality of second balance channels 601, and the plurality of second balance channels 601 are arranged along the circumferential direction of the guiding portion 620.

[0105] The guiding portion 620 is a guiding hole 621, and the guiding hole 621 penetrates through the connecting portion 610 along the axial direction of the electronic expansion valve; the valve needle 211 of the valve seat assembly 100 is inserted into the guiding hole 621, and the outer peripheral surface of the valve needle 211 of the valve seat assembly 100 is in guiding cooperation with the hole wall of the guiding hole 621.

[0106] As Figure 7 and Figure 8 shown, the same parts of the second embodiment of the present application and the first embodiment will not be described in detail. The differences are as follows:

[0107] The guiding part 620 includes a first guiding rod 622 and a guiding column 623. One end of the first guiding rod 622 is connected to the connecting part 610, and the other end is connected to the guiding column 623. The guiding column 623 extends into the first balance channel 201, and the outer peripheral surface of the guiding column 623 is in guiding cooperation with the inner wall surface of the first balance channel 201.

[0108] The outer periphery of the guiding column 623 has a first cutting surface 623a. The first cutting surface 623a penetrates through two first end faces 623b of the guiding column 623. The first cutting surface 623a and the inner wall surface of the first balance channel 201 enclose a third balance channel 602, and the first balance channel 201 is communicated with the valve port through the third balance channel 602.

[0109] In another embodiment, the guiding part 620 includes a first guiding rod 622 and a guiding column 623. One end of the guiding column 623 extends into the first balance channel 201 and is connected to the valve core assembly 200, and the other end is connected to the first guiding rod 622. The connecting part 610 further has a guiding hole 621 axially penetrating therethrough, and the outer peripheral surface of the first guiding rod 622 is in guiding cooperation with the hole wall of the guiding hole 621.

[0110] As Figure 9 and Figure 10 shown, the same parts of the third embodiment and the first embodiment of the present application will not be described in detail. The differences therebetween are as follows:

[0111] The guiding part 620 includes a second guiding rod 624. One end thereof is connected to the connecting part 610, and the other end extends into the first balance channel 201. The outer peripheral surface of the second guiding rod 624 is in guiding cooperation with the inner wall surface of the first balance channel 201.

[0112] The outer periphery of the second guiding rod 624 has a second cutting surface 624a. One end of the second cutting surface 624a extends to the second end face 624b of the second guiding rod 624 located in the first balance channel 201. The second cutting surface 624a and the inner wall surface of the first balance channel 201 enclose a fourth balance channel 603, and the first balance channel 201 is communicated with the valve port through the fourth balance channel 603.

[0113] In one embodiment, the number of the second cutting surfaces 624a is multiple, and the multiple second cutting surfaces 624a are arranged along the circumferential direction of the second guiding rod 624. Of course, in other embodiments, the number of the second cutting surfaces 624a may also be one.

[0114] In another embodiment, the guiding part 620 includes a second guiding rod 624, and the connecting part 610 further has a guiding hole 621 axially penetrating therethrough. One end of the second guiding rod 624 extends into the first balance channel 201 and is connected to the valve core assembly 200, and the other end is in guiding cooperation with the hole wall of the guiding hole 621.

[0115] AsFigure 11 and Figure 12 As shown, the same parts of the fourth embodiment of the present application as those of the first embodiment will not be described in detail. The differences are as follows:

[0116] There is a fifth balance channel 604 inside the second guide rod 624. The fifth balance channel 604 penetrates through the two second end faces 624b of the second guide rod 624; the first balance channel 201 is communicated with the second balance channel 601 through the fifth balance channel 604.

[0117] As Figure 13 shown, the same parts of the fifth embodiment of the present application as those of the fourth embodiment will not be described in detail. The differences are as follows:

[0118] The electronic expansion valve of the embodiment of the present application further includes a mounting seat 700. The mounting seat 700 has a mounting cavity 704, and at least part of the valve seat assembly 100 is inserted into the mounting cavity 704.

[0119] The mounting seat 700 further has an inlet 701, a first outlet 702 and a second outlet 703 that communicate with the mounting cavity 704. The inlet 701 communicates with the second opening 104 of the valve seat assembly 100, the first outlet 702 communicates with the first opening 103 of the valve seat assembly 100, and the second outlet 703 communicates with the third opening 105 of the valve seat assembly 100. Among them, the third opening 105 is opened at the bottom of the third valve seat 150.

[0120] As Figure 14 shown, the same parts of the sixth embodiment of the present application as those of the fifth embodiment will not be described in detail. The differences are as follows:

[0121] The length of the third valve seat 150 of the embodiment of the present application along the axial direction of the electronic expansion valve is greater than the axial length of the third valve seat 150 of the fifth embodiment, and the third opening 105 is opened at the side of the third valve seat 150.

[0122] As Figure 15 shown, the same parts of the seventh embodiment of the present application as those of the fifth embodiment will not be described in detail. The differences are as follows:

[0123] The electronic expansion valve does not have a guiding structure 600.

[0124] It can be understood that the electronic expansion valves of the first to fourth embodiments of the present application may not be provided with the mounting seat 700, but the first opening 103, the second opening 104 and the third opening 105 are directly connected to the external connecting pipes.

[0125] In summary, the electronic expansion valve of the embodiment of the present application has at least the following advantages and beneficial effects:

[0126] The electronic expansion valve according to the embodiment of the present application includes a first elastic member 230 and a second elastic member 500. The first elastic member 230 can apply a first pre-tightening force to the first valve core 210 to block the first valve port 101, and the second elastic member 500 can apply a second pre-tightening force to the first valve core 210 to block the second valve port 102. In this way, the sealing performance of the first valve core 210 for blocking the first valve port 101 or the second valve port 102 is significantly improved, preventing fluid leakage of the electronic expansion valve and improving the working reliability. In addition, in the electronic expansion valve according to the embodiment of the present application, the screw 300 drives the first valve core 210 to move between a first position and a second position through the second valve core 220. Moreover, the first pre-tightening force provided by the first elastic member 230 acts on the first valve core 210 and the second valve core 220 respectively, and the second pre-tightening force provided by the second elastic member 500 acts on the screw 300 and the second valve core 220 respectively, so that the first pre-tightening force and the second pre-tightening force do not affect each other, ensuring that the first pre-tightening force and the second pre-tightening force are large enough, and further improving the sealing performance when the first valve core 210 blocks the first valve port 101 and the second valve port 102.

[0127] In the clearance fit state, when the axial dimension of the part of the connecting shaft 211a inserted into the connecting hole 212a is less than or equal to a first target value, the first elastic member 230 is in its original length state. On the one hand, the connecting shaft 211a and the connecting hole 212a are in a clearance fit state, and the inner wall surface of the connecting hole 212a can play a guiding role to guide the connecting shaft 211a to be inserted into the connecting hole 212a. On the other hand, since the first elastic member 230 is in its original length state when the axial dimension of the part of the connecting shaft 211a inserted into the connecting hole 212a is less than or equal to the first target value, the first elastic member 230 does not generate an elastic force at this time. That is to say, at the initial stage when the connecting shaft 211a is inserted into the connecting hole 212a, the connecting shaft 211a will not be subjected to the reaction force provided by the first elastic force, improving the smoothness of inserting the connecting shaft 211a into the connecting hole 212a, and further improving the assembly efficiency.

[0128] The electronic expansion valve according to the embodiment of the present application includes a guiding structure 600 for guiding the movement of the valve core assembly 200. The guiding structure 600 can effectively avoid the problem that the valve core assembly 200 is prone to tilt and cannot align with the valve port after being affected by the fluid impact force. In addition, the valve core assembly 200 has a first balance channel 201 communicating with the back pressure chamber 111 and the valve port 110a, and the guiding structure 600 has a second balance channel 601 communicating with the first balance channel 201 and the valve port 110a, making the electronic expansion valve an internal balance valve as a whole and improving the ability of opening and closing the valve.

[0129] It can be understood that the various embodiments / embodiment modes provided in the present application can be combined with each other without contradiction, and no further examples will be given here.

[0130] In the embodiments of the application, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plural" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "joined", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the application can be understood according to specific circumstances.

[0131] In the description of the embodiments of the application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the application.

[0132] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0133] The above are only the preferred embodiments of the embodiments of the application and are not used to limit the embodiments of the application. For those skilled in the art, the embodiments of the application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the application shall be included within the protection scope of the embodiments of the application.

Claims

1. A valve core assembly, characterized in that: It includes a first component, a second component and a first elastic member; One of the first component and the second component has a connecting hole, and the other has a connecting shaft for inserting into the connecting hole, and at least a portion of the first elastic member is located in the connecting hole and can be resisted by the connecting shaft; When the axial dimension of the connecting shaft inserted into the connecting hole is less than or equal to the first target value, the first elastic member is in the original length state.

2. The valve core assembly according to claim 1, characterized in that: The connecting shaft includes a first fitting section. When the axial dimension of the connecting shaft inserted into the connecting hole is less than or equal to the first target value, at least part of the first fitting section is located in the connecting hole, and the first fitting section is loosely fitted with the inner wall of the connecting hole.

3. The valve core assembly according to claim 2, characterized in that: The connecting shaft also includes a second mating section that forms a stepped surface with the first mating section. When the axial dimension of the connecting shaft inserted into the connecting hole is greater than the first target value, the first mating section is entirely located in the connecting hole, and the first mating section has a clearance fit with the inner wall of the connecting hole. At least a portion of the second mating section is located in the connecting hole, and the second mating section has an interference fit with the inner wall of the connecting hole.

4. The valve core assembly according to claim 1, characterized in that: One of the first component and the second component further comprises a fourth stopper, which is used to stop the other of the first component and the second component when the axial dimension of the connecting shaft inserted into the connecting hole reaches a second target value; Wherein, the second target value is greater than the first target value.

5. The valve core assembly according to claim 4, characterized in that: The fourth stop portion is an annular protrusion surrounding the outer circumferential surface of the connecting shaft and is used for abutting against the periphery of the connecting hole.

6. The valve core assembly according to claim 1, characterized in that: One end of the connecting shaft has an end surface; The connecting shaft also has a receiving groove, and the receiving groove is recessed from the end surface along the axial direction of the connecting shaft toward the other end of the connecting shaft; At least a portion of the first elastic member is located in the accommodating groove.

7. The valve core assembly according to claim 1, characterized in that: The second component is a first valve sleeve, the first valve sleeve has the connecting hole, the inner circumferential surface of the first valve sleeve is convexly provided with a first stopper, and the first stopper and the end surface of the connecting shaft are arranged at intervals along the axial direction of the connecting shaft; The valve core assembly also includes a second valve core, and a portion of the second valve core extending into the first valve sleeve is provided with a flange, and the flange is located between the first stop portion and the end surface and is used to squeeze the first elastic member or contact the first stop portion.

8. The valve core assembly according to claim 7, characterized in that: When the axial dimension of the connecting shaft inserted into the connecting hole is greater than or equal to the first target value, one end of the first elastic member abuts against the second valve core, and the other end abuts against the connecting shaft.

9. The valve core assembly according to claim 7, characterized in that: The second valve core comprises: a valve core seat, at least a portion of which is disposed in the first valve sleeve and has the flange; and A second valve sleeve, wherein one axial end of the second valve sleeve is fixedly connected to the valve core seat.

10. An electronic expansion valve, characterized in that: A valve core assembly comprising any one of claims 1 to 9.

Images