Valve core assembly and electronic expansion valve

Abstract

The present disclosure provides a valve core assembly and an electronic expansion valve. The valve core assembly comprises a first valve core, a second valve core, and a sealing member, the first valve core is connected to the second valve core, and the second valve core can move relative to the first valve core. The first valve core comprises a valve core body and a first flange, the first flange is arranged on an outer peripheral side surface of the valve core body, and the side surface of the first flange along the axial direction of the valve core body is a sealing surface. The sealing member is sleeved on the outer periphery of the valve core body and fits against the sealing surface.

Description

Valve core assembly and electronic expansion valve

[0001] This disclosure claims priority to Chinese Patent Application No. 202422906310.1, filed on November 26, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of valve technology, and more specifically, to a valve core assembly and an electronic expansion valve. Background Technology

[0003] Expansion valves in related technologies include a valve core assembly and a valve seat. The valve seat has a valve port, and the valve core assembly is movably disposed within the valve seat to close or open the valve port, thereby switching the flow path. However, the valve seat of the expansion valve in related technologies is equipped with a plastic or rubber seal, and the valve core assembly cooperates with the seal to achieve a seal. However, the structure of the valve seat with a seal is relatively complex, especially when it involves multi-way valves, such as three-way or four-way structures, where the valve seat needs to be equipped with multiple seals, which can easily lead to a complex overall structure of the valve seat.

[0004] Utility Model Content

[0005] This disclosure provides a valve core assembly and an electronic expansion valve to solve the problem of complex overall structure of the valve seat in related technologies.

[0006] According to one aspect of this disclosure, a valve core assembly according to an embodiment of this disclosure includes a first valve core, a second valve core, and a seal. The first valve core is connected to the second valve core, and the second valve core is movable relative to the first valve core. The first valve core includes a valve core body and a first flange. The first flange is disposed on the outer peripheral side of the valve core body, and one side surface of the first flange along the axial direction of the valve core body is a sealing surface. The seal is sleeved on the outer periphery of the valve core body and fits against the sealing surface.

[0007] According to one embodiment of this disclosure, the first valve core is made of stainless steel; and / or, the second valve core is made of stainless steel.

[0008] According to one embodiment of this disclosure, one end of the first valve core is riveted and deformed to form a first limiting end, at least a portion of the second valve core extends into the first valve core and is restricted from detaching from the first valve core by the first limiting end; and / or, the other end of the first valve core is riveted and deformed to form a second limiting end, the sealing member is disposed at the other end of the first valve core and is restricted from detaching from the first valve core by the second limiting end.

[0009] According to one embodiment of this disclosure, the portion of the first valve core located between the first limiting end and the second limiting end includes a first segment and a second segment, the first segment being located between the first limiting end and the second segment, and the radial dimension of the first segment being greater than the radial dimension of the second segment.

[0010] According to one embodiment of this disclosure, the first valve core is made of aluminum alloy; and / or, the second valve core is made of aluminum alloy.

[0011] According to one embodiment of this disclosure, the valve core assembly further includes a first pressure plate connected to the first valve core, the first pressure plate pressing against the side surface of the seal facing away from the first flange.

[0012] According to one embodiment of this disclosure, the sealing surface is provided with a first protrusion that contacts the sealing element; and / or, the surface of the first pressure plate facing the sealing element is provided with a second protrusion that contacts the sealing element.

[0013] According to one embodiment of this disclosure, one end of the first valve core has a receiving groove, and at least a portion of the second valve core is located within the receiving groove; the valve core assembly further includes a second pressure plate, the second pressure plate being fixedly connected to the first valve core, and the second pressure plate restricting at least a portion of the second valve core within the receiving groove.

[0014] According to one embodiment of this disclosure, one end of the first valve core has a receiving groove, and at least a portion of the second valve core is located within the receiving groove; the valve core assembly further includes a second pressure plate, the second pressure plate being fixedly connected to the first valve core via the first limiting end, the second pressure plate restricting at least a portion of the second valve core within the receiving groove; the valve core assembly further includes a first pressure plate connected to the first valve core, the first pressure plate abutting against the side surface of the seal opposite to the first flange, and being restricted to the valve core body by the second limiting end.

[0015] According to one embodiment of this disclosure, the second valve core includes a limiting seat, and a second flange is provided on the outer periphery of the limiting seat. The second flange is located in the receiving groove. The valve core assembly also includes a first elastic member, which is located in the receiving groove and sleeved on the outer periphery of the limiting seat. One end of the first elastic member abuts against the second pressure plate, and the other end of the first elastic member abuts against the second flange.

[0016] According to one embodiment of this disclosure, the limiting seat has a groove on one side facing the bottom surface of the receiving groove, the bottom wall of the groove is a sealing end, and the side wall of the groove has a through hole communicating with the receiving groove and the groove.

[0017] According to one embodiment of this disclosure, the limiting seat is provided with a second flow channel, the second flow channel extending through the limiting seat along the valve axis, and the side wall of the limiting seat has a through hole communicating with the receiving groove and the second flow channel.

[0018] According to one embodiment of this disclosure, the second valve core further includes a valve sleeve, a second elastic element, and a screw. The valve sleeve is fixedly connected to the limiting seat. The second elastic element is located inside the valve sleeve and is connected to the second valve core and the screw. One end of the second elastic element abuts against the end of the limiting seat away from the first valve port, and the other end of the limiting seat abuts against the screw. The side wall of the valve sleeve is provided with a communicating hole.

[0019] According to another aspect of this disclosure, the electronic expansion valve of this disclosure embodiment includes:

[0020] Valve seat, the valve seat including a first valve seat having a valve port; and

[0021] In any of the above embodiments, at least a portion of the valve core assembly is disposed within the first valve seat for closing or opening the valve port.

[0022] According to one embodiment of this disclosure, the valve port includes a first valve port and a second valve port;

[0023] The first valve seat includes a first part and a second part connected to each other, with the first valve port located in the first part and the second valve port located in the second part; or, the first valve seat includes a first part, a second part and a third part connected to each other, with the first valve port located in the second part and the second valve port located in the third part.

[0024] According to one embodiment of this disclosure, the valve port includes a first valve port and a second valve port, and the first valve seat includes a first split, a second split, and a third split connected to each other;

[0025] A portion of the first split is located within the second split, a portion of the second split is located within the third split, the first valve port is located within the second split, and the second valve port is located within the third split.

[0026] According to one embodiment of this disclosure, the valve seat further includes a second valve seat having a mounting cavity, and the first valve seat is installed in the mounting cavity;

[0027] The valve port includes a first valve port and a second valve port, with the first valve port located on the first valve seat and the second valve port located on the second valve seat.

[0028] According to one embodiment of this disclosure, the outer periphery of the first valve seat has a stepped structure, and the cavity wall of the mounting cavity of the second valve seat has a limiting portion, which is matched with the stepped structure for limiting.

[0029] According to one embodiment of this disclosure, the outer peripheral side of the seal has a first throttling slope, the first throttling slope being used to cooperate with the valve port to regulate the flow rate of fluid passing through the valve port;

[0030] And / or, the outer peripheral side of the first pressure plate of the valve core assembly has a second throttling slope, which is used to cooperate with the valve port to regulate the flow rate of fluid passing through the valve port.

[0031] According to one embodiment of this disclosure, the first valve seat has a valve cavity, and an annular groove is provided on the circumferential outer surface of the first valve core. A sealing structure is provided in the annular groove, and the sealing structure is located between the outer wall of the first valve core and the inner wall of the valve cavity.

[0032] One embodiment disclosed above has at least the following advantages or beneficial effects:

[0033] In the valve core assembly of this disclosure, the sealing element is directly sleeved on the outer periphery of the valve core body of the first valve core and fits against the sealing surface. When the second valve core moves relative to the first valve core, the sealing element does not move with the first valve core and is used to fit against the inner wall of the valve seat to achieve a sealing function. Since the sealing element does not need to be fixed on the valve seat, the structure of the valve seat can be simplified, making its design and manufacturing easier. Attached Figure Description

[0034] The above and other features and advantages of this disclosure will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0035] Figure 1 shows a perspective view of the electronic expansion valve according to the first embodiment of this disclosure.

[0036] Figure 2 shows a cross-sectional view along section line AA of Figure 1.

[0037] Figure 3 shows an exploded view of the valve core assembly of the electronic expansion valve according to the first embodiment of this disclosure (both ends of the first valve core are in an unriveted state).

[0038] Figure 4 shows a partial schematic diagram of the valve core body of the electronic expansion valve according to the first embodiment of this disclosure.

[0039] Figure 5 shows a perspective view of the first pressure plate of the electronic expansion valve according to the first embodiment of this disclosure.

[0040] Figure 6 shows a perspective view of the seal of the electronic expansion valve according to the first embodiment of this disclosure.

[0041] Figure 7 shows a perspective view of the electronic expansion valve according to the second embodiment of this disclosure.

[0042] Figure 8 shows a cross-sectional view along the BB section line of Figure 7.

[0043] Figure 9 shows a perspective view of the electronic expansion valve according to the third embodiment of this disclosure.

[0044] Figure 10 shows a cross-sectional view along the CC section line of Figure 9.

[0045] The reference numerals in the attached figures are explained as follows:

[0046] 100, Valve seat; 100a, First opening; 100b, Second opening; 100c, Third opening; 101, First valve port; 102, Second valve port; 103, Valve cavity; 1031, Guide cavity; 1032, First flow cavity; 1033, Second flow cavity; 110, First valve seat; 111, Stepped structure; 110a, First split part; 110b, Second split part; 120, Second valve seat; 121, Mounting cavity; 122, Limiting part; 123, First channel; 124, Second channel; 125, Third channel; 130, Sealing structure;

[0047] 200. Valve core assembly; 210. First valve core; 211. Valve core body; 2111. Receiving groove; 2112. Stepped surface; 2113. Reduced diameter section; 2114. First section; 2115. Second section; 2116. First flow channel; 212. First flange; 2121. Sealing surface; 213. First protrusion; 214. First limiting end; 215. Second limiting end; 220. Seal; 221. First Throttling ramp; 221a, first conical surface; 221b, second conical surface; 230, first pressure plate; 231, second protrusion; 232, second throttling ramp; 240, second pressure plate; 241, perforation; 250, first elastic element; 260, second valve core; 261, limiting seat; 2611, second flange; 2612, groove; 2614, second flow channel; 262, valve sleeve; 2621, connecting hole;

[0048] 310. Rotor assembly; 320. Outer casing; 330. Nut seat;

[0049] 400. Screw; 410. Bearing;

[0050] 500. Second elastic element. Detailed Implementation

[0051] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0052] It is understood that the terms "comprising" and "having," and any variations thereof, in the embodiments of this 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 steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0053] [First Embodiment]

[0054] As shown in Figures 1 and 2, the electronic expansion valve of the first embodiment of this disclosure includes a valve seat 100, a valve core assembly 200, a rotor assembly 310, an outer cover 320, a nut seat 330, and a screw 400.

[0055] Valve seat 100 has valve cavity 103, within which at least a portion of valve core assembly 200 is disposed and movable relative to valve seat 100 along the axial direction of the electronic expansion valve. Outer cover 320 is fixedly connected to valve seat 100, for example by welding, but not limited thereto. Rotor assembly 310 is movably disposed within outer cover 320 and is used for electromagnetic coupling with a coil assembly (not shown) sleeved on the outer periphery of outer cover 320. Nut seat 330 is fixedly connected to valve seat 100 and disposed within outer cover 320. Screw 400 is disposed within outer cover 320, connected to rotor assembly 310, and screwed to nut seat 330.

[0056] When the electronic expansion valve is working, by applying a pulse signal to the coil assembly, the coil assembly can drive the rotor assembly 310 to rotate the screw 400. Since the nut seat 330 is fixed relative to the valve seat 100 and screwed to the screw 400, the screw 400 can reciprocate along the axial direction of the electronic expansion valve, thereby driving the valve core assembly 200 to reciprocate relative to the valve seat 100 in the valve cavity 103.

[0057] As shown in Figure 2, in this embodiment of the present disclosure, the valve seat 100 includes a first valve seat 110, which has a valve cavity 103. The cavity wall of the valve cavity 103 has a valve port, and the valve core assembly 200 is used to close or open the valve port. In one embodiment, the valve port includes a first valve port 101 and a second valve port 102, which are arranged axially spaced along the electronic expansion valve. When the valve core assembly 200 closes the first valve port 101, the second valve port 102 is in an open state; when the valve core assembly 200 closes the second valve port 102, the first valve port 101 is in an open state.

[0058] The first valve seat 110 has a first opening 100a, a second opening 100b, and a third opening 100c, which are arranged sequentially along the axial direction of the electronic expansion valve and are respectively connected to the valve chamber 103. The first valve port 101 is located between the first opening 100a and the second opening 100b, and the second valve port 102 is located between the second opening 100b and the third opening 100c. When the first valve port 101 is closed, the second valve port 102 is open, and the second opening 100b is connected to the third opening 100c; when the second valve port 102 is closed, the first valve port 101 is open, and the first opening 100a is connected to the second opening 100b.

[0059] As shown in Figures 2 and 3, the valve core assembly 200 includes a first valve core 210, a seal 220, a first pressure plate 230, a second pressure plate 240, a second valve core 260, and a first elastic element 250.

[0060] The first valve core 210 is connected to the second valve core 260. The second valve core 260 can move relative to the first valve core 210. One end of the first valve core 210 is riveted and deformed to form a first limiting end 214. At least a portion of the second valve core 260 extends into the first valve core 210 and is restricted from detaching from the first valve core 210 by the first limiting end 214. The other end of the first valve core 210 is riveted and deformed to form a second limiting end 215. The sealing member 220 is provided at the other end of the first valve core 210 and is restricted from detaching from the first valve core 210 by the second limiting end 215.

[0061] In this embodiment of the valve core assembly 200, one end of the first valve core 210 is riveted to form a first limiting end 214, which restricts at least a portion of the second valve core 260 within the first valve core 210, preventing the second valve core 260 from detaching from the first valve core 210. The other end of the first valve core 210 is riveted to form a second limiting end 215, which restricts the seal 220 onto the first valve core 210. Thus, both the second valve core 260 and the seal 220 are connected to the first valve core 210 via a riveting process. This allows the first valve core 210 to be made of lighter and lower-cost materials, significantly reducing the weight of the valve core assembly 200, lowering material costs, facilitating weight reduction, and saving costs.

[0062] It should be understood that the second valve core 260 can move relative to the first valve core 210, meaning that the first valve core 210 is fixed and the second valve core 260 can move relative to the first valve core 210 in a direction away from the seal 220, so that the first elastic member 250 undergoes elastic deformation.

[0063] In one embodiment, as shown in FIG2, an annular groove is provided on the circumferential outer surface of the first valve core 210, and a sealing structure 130 is provided in the annular groove. The sealing structure 130 is located between the outer wall of the first valve core 210 and the inner wall of the valve cavity 103, which can enhance the sealing between the first valve core and the valve seat.

[0064] In one embodiment, referring to Figure 2, the valve cavity containing the first opening 100a is the first flow cavity 1032, and the valve cavity containing the sealing structure 130 is the guide cavity 1031. The radial opening dimension D3 of the guide cavity 1031 is smaller than the radial opening dimension D1 of the first flow cavity 1032. The valve cavity containing the second opening 100b is the second flow cavity 1033, and the radial opening dimension D2 of the second flow cavity 1033 is smaller than the radial opening dimension D1 of the first flow cavity 1032. This helps to reduce flow resistance and facilitates assembly.

[0065] In one embodiment, the first valve core 210 and / or the second valve core 260 are made of aluminum alloy.

[0066] It should be noted that, due to the high surface smoothness of aluminum alloy, riveting is more suitable than welding for connecting the first valve core 210 and the second valve core 260, as well as the first valve core 210 and the seal 220. Furthermore, if welding is used to connect the first valve core 210 and the seal 220, the heat generated during the welding process will be conducted to the seal 220, potentially causing deformation or aging of the seal 220 and affecting its sealing performance. However, the riveting process used in this case does not generate excessive heat, thus avoiding the problem of the seal 220 being affected by heat.

[0067] The first valve core 210 includes a valve core body 211 and a first flange 212. The first flange 212 is disposed on the outer peripheral side of the valve core body 211, and one side surface of the first flange 212 along the axial direction of the valve core body 211 is a sealing surface 2121. A sealing member 220 is sleeved on the outer periphery of the valve core body 211 and fits against the sealing surface 2121. The sealing member 220 is used to seal the first valve port 101 or the second valve port 102. A first pressure plate 230 abuts against the side surface of the sealing member 220 facing away from the first flange 212 and is restricted on the valve core body 211 by the second limiting end 215. The first flange 212 is integrally formed with the valve core body 211.

[0068] In one embodiment, the first pressure plate 230 and the first valve core 210 may be made of the same material or different materials. For example, both the first pressure plate 230 and the first valve core 210 may be made of aluminum alloy.

[0069] As shown in Figures 2 and 3, the valve core body 211 has a receiving groove 2111 at the end away from the first pressure plate 230. At least a portion of the second valve core 260 is disposed within the receiving groove 2111. The second pressure plate 240 is fixedly connected to the first valve core 210 via a first limiting end 214 and is constrained within the receiving groove 2111 by the first limiting end 214, thereby confining at least a portion of the second valve core 260 within the receiving groove 2111. The second pressure plate 240 has a through hole 241 that penetrates the second pressure plate 240 along the axial direction of the valve core body 211. The second valve core 260 passes through the through hole 241. In one embodiment, the second pressure plate 240 and the first valve core 210 may be made of the same material or different materials. For example, both the second pressure plate 240 and the first valve core 210 may be made of aluminum alloy.

[0070] As shown in Figures 2 and 3, the portion of the valve core body 211 located between the first limiting end 214 and the second limiting end 215 includes a first segment 2114 and a second segment 2115, with the first segment 2114 situated between the first limiting end 214 and the second segment 2115. The radial dimension of the first segment 2114 is larger than that of the second segment 2115 along the valve's radial direction, resulting in a stepped surface 2112 forming on the outer periphery of the valve core body 211, with the stepped surface 2112 facing the second limiting end 215. The valve core body 211 has a circular cross-section and possesses both axial and radial dimensions; therefore, the valve's radial direction can refer to the radial direction of the valve core body 211.

[0071] In this embodiment of the present disclosure, on the one hand, the second segment 2115 has a smaller radial dimension along the valve, which can ensure a larger flow area when the first valve port 101 is in the open state; on the other hand, by providing a stepped surface 2112 in the middle part of the valve core body 211, and the stepped surface 2112 facing the second limiting end 215, the riveting force can be applied to the stepped surface 2112 when the first limiting end 214 is riveted, thus preventing the second segment 2115 from deforming.

[0072] Furthermore, the portion of the valve core body 211 located between the stepped surface 2112 and the first flange 212 has a reduced diameter section 2113. The reduced diameter section 2113 is located between the second segment 2115 and the first flange 212. The radial dimension of the reduced diameter section 2113 is smaller than the radial dimension of the second segment 2115.

[0073] When the first valve core 210 closes the second valve port 102, the position of the reduced diameter section 2113 corresponds to the position of the first valve port 101, so that the first valve port 101 can have a larger flow area when it is opened.

[0074] Since the radial dimension of the reduced diameter section 2113 is small, by setting a stepped surface 2112 in the middle part of the valve core body 211, the riveting pressure can be transmitted to the press-fit stepped surface 2112 when the first limiting end 214 is formed by riveting, which can prevent the relatively weak reduced diameter section 2113 from bending and deforming due to the riveting pressure.

[0075] The first elastic element 250 is located in the receiving groove 2111 and is connected to the second pressure plate 240 and the second valve core 260 respectively. One end of the first elastic element 250 abuts against the second pressure plate 240, and the other end abuts against the second flange 2611 of the second valve core 260.

[0076] After the first valve core 210 closes the first valve port 101, the second valve core 260 can move away from the first valve port 101 relative to it, thereby increasing the compression of the first elastic member 250. This causes the first elastic member 250 to apply a first pre-tightening force to the first valve core 210 to seal the first valve port 101, thereby improving the sealing performance of the first valve port 101, preventing fluid leakage from the electronic expansion valve, and improving reliability.

[0077] As shown in Figure 2, the electronic expansion valve also includes a second elastic element 500, which is located inside the second valve core 260 and connected to the second valve core 260 and the screw 400. After the first valve core 210 closes the second valve port 102, the screw 400 can move relative to the first valve core 210 towards the second valve port 102, thereby increasing the compression of the second elastic element 500. The second elastic element 500 is used to apply a second preload force to the first valve core 210 through the second valve core 260 to seal the second valve port 102, thereby improving the sealing performance of the second valve port 102, preventing fluid leakage from the electronic expansion valve, and improving reliability.

[0078] In one embodiment, the first elastic element 250 and the second elastic element 500 may be springs, but are not limited thereto. For example, the first elastic element 250 and the second elastic element 500 may also be rubber parts or other components that can provide elastic force under pressure.

[0079] As shown in Figure 2, the second valve core 260 includes a limiting seat 261 and a valve sleeve 262. A second flange 2611 is provided on the outer periphery of the limiting seat 261 near the first valve port 101. The second flange 2611 is located within a receiving groove 2111. The valve sleeve 262 is connected to the end of the limiting seat 261 away from the sealing element 220. A first elastic element 250 is located within the receiving groove 2111 and is sleeved on the outer periphery of the limiting seat 261. One end of the first elastic element 250 abuts against the second pressure plate 240, and the other end abuts against the second flange 2611. A second elastic element 500 is located within the valve sleeve 262. One end of the second elastic element 500 abuts against the end of the limiting seat 261 away from the first valve port 101, and the other end abuts against the screw 400. A connecting hole 2621 is provided on the side wall of the valve sleeve 262.

[0080] As shown in Figure 2, the first valve core 210 has a first flow channel 2116, which extends through the first valve core 210 along the valve axial direction. The limiting seat 261 has a second flow channel 2614, which extends through the limiting seat 261 along the valve axial direction. The side wall of the limiting seat 261 has a through hole 2613 communicating with the second flow channel 2614. The valve axial direction can refer to the axial direction of the valve core body 211.

[0081] As shown in Figure 2, the guide cavity 1031, the connecting hole 2621, the through hole 2613, the second flow channel 2614, and the first flow channel 2116 are all connected to maintain the fluid pressure balance in the valve; the guide cavity 1031, the connecting hole 2621, the perforation 241, the receiving groove 2111, the through hole 2613, the second flow channel 2614, and the first flow channel 2116 are all connected to maintain the fluid pressure balance in the valve.

[0082] As shown in Figure 4, the sealing surface 2121 is provided with a first protrusion 213, which contacts the sealing element 220.

[0083] In this embodiment of the present disclosure, by providing a first protrusion 213 on the sealing surface 2121, when the sealing member 220 is attached to the sealing surface 2121, the first protrusion 213 can improve the sealing performance between the sealing member 220 and the first flange 212.

[0084] In one embodiment, the first protrusion 213 is an annular structure surrounding the outer periphery of the valve core body 211; the cross-sectional shape of the first protrusion 213 is any one of triangle, rectangle, or semicircle.

[0085] As shown in Figure 5, the first pressure plate 230 has a second protrusion 231 on the side surface facing the seal 220, and the second protrusion 231 contacts the seal 220.

[0086] In this embodiment of the present disclosure, the first pressure plate 230 is provided with a second protrusion 231 on the side surface facing the seal 220. When the seal 220 is attached to this side surface, the second protrusion 231 can improve the sealing performance between the first pressure plate 230 and the seal 220.

[0087] In one embodiment, the second protrusion 231 is an annular structure surrounding the outer periphery of the valve core body 211; the cross-sectional shape of the second protrusion 231 is any one of triangle, rectangle, or semicircle.

[0088] As shown in Figure 6, the outer peripheral surface of the seal 220 has a first throttling ramp 221, which is used to cooperate with the valve port to regulate the flow rate of the fluid passing through the valve port. After the fluid passes through the first throttling ramp 221, the pressure decreases. Therefore, the pressure change of the fluid before and after the first throttling ramp 221 will generate a driving force on the valve core assembly 200 in the direction of the valve port, which is beneficial to improving the valve's operating capability and flow distribution capability.

[0089] In one embodiment, the first throttling slope 221 includes a first conical surface 221a and a second conical surface 221b. The first conical surface 221a is used to seal with the first valve port 101, and the second conical surface 221b is used to seal with the second valve port 102.

[0090] As shown in Figure 2, the outer peripheral side of the first pressure plate 230 has a second throttling slope 232, which is used to cooperate with the valve port to adjust the flow rate of the fluid passing through the valve port.

[0091] In one embodiment, the second throttling inclined surface 232 is an outer conical surface, but is not limited thereto.

[0092] As shown in Figure 2, the first valve seat 110 includes a first split body 110a and a second split body 110b connected to each other. The first valve port 101 is located in the first split body 110a, and the second valve port 102 is located in the second split body 110b. By designing the first valve seat 110 as a split structure, the overall length of the valve can be shortened.

[0093] In another embodiment, the first valve seat 110 may also be a three-section split structure. For example, the first valve seat 110 includes a first section 110a, a second section 110b, and a third section connected to each other, with the second section 110b located between the first section 110a and the third section. The first valve port 101 is located in the second section 110b, and the second valve port 102 is located in the third section.

[0094] In another embodiment, the first valve seat 110 is a three-section split structure. For example, the first valve seat 110 includes a first section 110a, a second section 110b, and a third section connected to each other, with the second section 110b located between the first section 110a and the third section. A portion of the first section 110a is located within the second section 110b, and a portion of the second section 110b is located within the third section. The first valve port 101 is located in the second section 110b, and the second valve port 102 is located in the third section.

[0095] [Second Embodiment]

[0096] As shown in Figures 7 and 8, the similarities between the electronic expansion valve of the second embodiment and the electronic expansion valve of the first embodiment will not be repeated here. The differences are as follows:

[0097] The valve seat 100 also includes a second valve seat 120, which has a mounting cavity 121 in which the first valve seat 110 is installed. The second valve seat 120 has a first channel 123, a second channel 124 and a third channel 125. The first channel 123 communicates with the first opening 100a, the second channel 124 communicates with the second opening 100b, and the third channel 125 communicates with the third opening 100c.

[0098] When the first valve port 101 is closed and the second valve port 102 is open, the second channel 124 is connected to the third channel 125; when the second valve port 102 is closed and the first valve port 101 is open, the first channel 123 is connected to the second channel 124.

[0099] In one embodiment, the limiting seat 261 has a groove 2612 on the side facing the bottom surface of the receiving groove 2111, and the bottom wall of the groove 2612 is a sealing end. The side wall of the groove 2612 has a through hole 2613 communicating with the receiving groove 2111 and the groove 2612.

[0100] In this embodiment of the present disclosure, a through hole 2613 is provided on the side wall of the limiting seat 261, and the end of the limiting seat 261 connected to the valve sleeve 262 is closed. In this way, fluid can flow through the through hole 2613 from the groove 2612 to the receiving groove 2111, without flowing into the valve sleeve 262, thus preventing impurities from entering the valve sleeve 262 through the limiting seat 261 and avoiding contamination of the bearing 410 of the screw 400 by impurities.

[0101] As an example, the dimension of the first valve seat 110 in the second embodiment of this disclosure along the axial direction of the electronic expansion valve is smaller than that of the first valve seat 110 in the first embodiment.

[0102] As shown in Figure 8, the valve sleeve 262 is connected to the valve cavity of the first valve seat 110 through the connecting hole 2621.

[0103] [Third Embodiment]

[0104] As shown in Figures 9 and 10, the similarities between the electronic expansion valve of the third embodiment and the electronic expansion valve of the second embodiment will not be repeated here. The differences are as follows:

[0105] The first valve port 101 is located on the first valve seat 110, and the second valve port 102 is located on the second valve seat 120.

[0106] The outer periphery of the first valve seat 110 has a stepped structure 111, and the cavity wall of the mounting cavity 121 of the second valve seat 120 has a limiting part 122. The limiting part 122 and the stepped structure 111 limit each other, thereby limiting the position of the valve port and the valve body.

[0107] In this embodiment of the present disclosure, the first valve port 101 is disposed on the first valve seat 110, and the second valve port 102 is disposed on the second valve seat 120. After the valve core assembly 200 is assembled with the first valve seat 110, but before it is installed into the mounting cavity 121 of the second valve seat 120, the valve opening pulse point of the first valve port 101 can be determined by testing the gas flow rate; while the valve opening pulse point of the second valve port 102 can be determined according to the machining dimensional accuracy of the parts.

[0108] Specifically, for the first valve port 101, when the rotor assembly 310 moves to the upper limit position, it is the zero pulse position. After that, the rotor assembly 310 moves downward. When the flow sensor detects that there is flow in the first valve port 101, the distance that the screw 400 moves at this time corresponds to the valve opening pulse point.

[0109] For the second valve port 102, since the stepped structure 111 of the first valve seat 110 and the limiting part 122 of the second valve seat 120 are in a limiting fit, the relative positional accuracy between the second valve port 102 and the first valve seat 110 can be limited by controlling the installation accuracy of the stepped structure 111 and the limiting part 122, thereby determining the valve opening pulse point.

[0110] In summary, the valve core assembly 200 and the electronic expansion valve of the present disclosure embodiments have at least the following advantages and beneficial effects:

[0111] In this embodiment of the valve core assembly 200, one end of the first valve core 210 is riveted to form a first limiting end 214, which restricts at least a portion of the second valve core 260 within the first valve core 210, preventing the second valve core 260 from detaching from the first valve core 210. The other end of the first valve core 210 is riveted to form a second limiting end 215, which restricts the seal 220 onto the first valve core 210. Thus, both the second valve core 260 and the seal 220 are connected to the first valve core 210 via a riveting process. This allows the first valve core 210 to be made of lighter and lower-cost materials, significantly reducing the weight of the valve core assembly 200, lowering material costs, facilitating weight reduction, and saving costs.

[0112] [Fourth Embodiment]

[0113] The valve core assembly in this embodiment includes a first valve core 210, a second valve core 260, and a seal 220. The first valve core 210 is connected to the second valve core 260, and the second valve core 260 is movable relative to the first valve core 210. The first valve core 210 includes a valve core body 211 and a first flange 212. The first flange 212 is disposed on the outer peripheral side of the valve core body 211, and one side surface of the first flange 212 along the axial direction of the valve core body 211 is a sealing surface 2121. The seal 220 is sleeved on the outer periphery of the valve core body 211 and fits against the sealing surface 2121.

[0114] In the valve core assembly of this disclosure, the sealing element is directly sleeved on the outer periphery of the valve core body of the first valve core and fits against the sealing surface. When the second valve core moves relative to the first valve core, the sealing element does not move with the first valve core and is used to fit against the inner wall of the valve seat to achieve a sealing function. Since the sealing element does not need to be fixed on the valve seat, the structure of the valve seat can be simplified, making its design and manufacturing easier.

[0115] It should be understood that the difference between the fourth embodiment of this disclosure and the foregoing embodiments is that the two ends of the first valve core do not need to be riveted to form the first limiting end and the second limiting end.

[0116] In this embodiment of the disclosure, since riveting is not required, both the first valve core and the second valve core can be made of stainless steel. In other embodiments, either the first valve core or the second valve core can be made of stainless steel.

[0117] [Fifth Embodiment]

[0118] Based on Embodiment 4, one end of the first valve core can be riveted and deformed to form a first limiting end, and at least a portion of the second valve core can extend into the first valve core and be restricted from detaching from the first valve core by the first limiting end.

[0119] Alternatively, the other end of the first valve core can be riveted and deformed to form a second limiting end, with the sealing element located at the other end of the first valve core and restricted from detaching from the first valve core by the second limiting end.

[0120] It is understood that the various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions, and will not be described in detail here.

[0121] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0122] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0123] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the claims. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0124] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. A valve core assembly, characterized in that, The device includes a first valve core, a second valve core, and a seal. The first valve core is connected to the second valve core, and the second valve core is movable relative to the first valve core. The first valve core includes a valve core body and a first flange. The first flange is disposed on the outer peripheral side of the valve core body, and one side surface of the first flange along the axial direction of the valve core body is a sealing surface. The seal is sleeved on the outer periphery of the valve core body and fits against the sealing surface.

2. The valve core assembly according to claim 1, characterized in that, The first valve core is made of stainless steel; and / or the second valve core is made of stainless steel.

3. The valve core assembly according to claim 1, characterized in that, One end of the first valve core is riveted and deformed to form a first limiting end. At least a portion of the second valve core extends into the first valve core and is restricted from detaching from the first valve core by the first limiting end. And / or, the other end of the first valve core is riveted and deformed to form a second limiting end, and the sealing element is disposed at the other end of the first valve core and is restricted from detaching from the first valve core by the second limiting end.

4. The valve core assembly according to claim 3, characterized in that, The portion of the first valve core located between the first limiting end and the second limiting end includes a first segment and a second segment. The first segment is located between the first limiting end and the second segment, and the radial dimension of the first segment is greater than the radial dimension of the second segment.

5. The valve core assembly according to claim 3, characterized in that, The first valve core is made of aluminum alloy; and / or, the second valve core is made of aluminum alloy.

6. The valve core assembly according to claim 1, characterized in that, The valve core assembly further includes a first pressure plate, which is connected to the first valve core and presses against the side surface of the seal facing away from the first flange.

7. The valve core assembly according to claim 6, characterized in that, The sealing surface is provided with a first protrusion, which contacts the sealing element; and / or, the surface of the first pressure plate facing the sealing element is provided with a second protrusion, which contacts the sealing element.

8. The valve core assembly according to claim 1, characterized in that, The first valve core has a receiving groove at one end, and at least a portion of the second valve core is located within the receiving groove; the valve core assembly further includes a second pressure plate, which is fixedly connected to the first valve core and restricts at least a portion of the second valve core within the receiving groove.

9. The valve core assembly according to claim 3, characterized in that, One end of the first valve core has a receiving groove, and at least a portion of the second valve core is located within the receiving groove; the valve core assembly further includes a second pressure plate, which is fixedly connected to the first valve core via the first limiting end, and the second pressure plate restricts at least a portion of the second valve core within the receiving groove; the valve core assembly further includes a first pressure plate connected to the first valve core, which abuts against the side surface of the seal facing away from the first flange, and is restricted to the valve core body by the second limiting end.

10. The valve core assembly according to claim 8, characterized in that, The second valve core includes a limiting seat, and a second flange is provided on the outer peripheral side of the limiting seat, the second flange being located within the receiving groove; The valve core assembly further includes a first elastic element, which is located in the receiving groove and sleeved on the outer periphery of the limiting seat. One end of the first elastic element abuts against the second pressure plate, and the other end abuts against the second flange.

11. The valve core assembly according to claim 10, characterized in that, The limiting seat has a groove on one side facing the bottom surface of the receiving groove, the bottom wall of the groove is a sealing end, and the side wall of the groove has a through hole communicating with the receiving groove and the groove.

12. The valve core assembly according to claim 10, characterized in that, The limiting seat is provided with a second flow channel, which extends through the limiting seat along the valve axis. The side wall of the limiting seat has a through hole that communicates with the receiving groove and the second flow channel.

13. The valve core assembly according to claim 10, characterized in that, The second valve core further includes a valve sleeve, a second elastic element, and a screw. The valve sleeve is fixedly connected to the limiting seat. The second elastic element is located inside the valve sleeve and is connected to the second valve core and the screw. One end of the second elastic element abuts against the end of the limiting seat away from the first valve port, and the other end of the limiting seat abuts against the screw. The side wall of the valve sleeve is provided with a connecting hole.

14. An electronic expansion valve, characterized in that, include: The valve seat includes a first valve seat having a valve port; as well as The valve core assembly according to any one of claims 1-13, wherein at least a portion of the valve core assembly is disposed within the first valve seat for closing or opening the valve port.

15. The electronic expansion valve according to claim 14, characterized in that, The valve port includes a first valve port and a second valve port; The first valve seat includes a first part and a second part connected to each other, with the first valve port located in the first part and the second valve port located in the second part; Alternatively, the first valve seat may include a first part, a second part, and a third part connected to each other, with the first valve port located in the second part and the second valve port located in the third part.

16. The electronic expansion valve according to claim 14, characterized in that, The valve port includes a first valve port and a second valve port, and the first valve seat includes a first part, a second part and a third part connected to each other; A portion of the first split is located within the second split, a portion of the second split is located within the third split, the first valve port is located within the second split, and the second valve port is located within the third split.

17. The electronic expansion valve according to claim 14, characterized in that, The valve seat further includes a second valve seat, the second valve seat having a mounting cavity, and the first valve seat is installed in the mounting cavity; The valve port includes a first valve port and a second valve port, with the first valve port located on the first valve seat and the second valve port located on the second valve seat.

18. The electronic expansion valve according to claim 17, characterized in that, The outer periphery of the first valve seat has a stepped structure, and the cavity wall of the mounting cavity of the second valve seat has a limiting part, which is matched with the stepped structure for limiting.

19. The electronic expansion valve according to claim 14, characterized in that, The outer peripheral side of the seal has a first throttling slope, which is used to cooperate with the valve port to regulate the flow rate of the fluid passing through the valve port; And / or, the outer peripheral side of the first pressure plate of the valve core assembly has a second throttling slope, which is used to cooperate with the valve port to regulate the flow rate of fluid passing through the valve port.

20. The electronic expansion valve according to claim 14, characterized in that, The first valve seat has a valve cavity, and the circumferential outer surface of the first valve core is provided with an annular groove. A sealing structure is provided in the annular groove, and the sealing structure is located between the outer wall of the first valve core and the inner wall of the valve cavity.

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