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 valve element, a second valve element and a sealing piece, the first valve element is connected with the second valve element, one end of the first valve element is riveted and deformed to form a first limiting end, and at least part of the second valve element extends into the first valve element and is limited by the first limiting end to be separated from the first valve element; the other end of the first valve element is riveted and deformed to form a second limiting end, and the sealing piece is arranged at the other end of the first valve element and limited by the second limiting end to be separated from the first valve element.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a valve core assembly and an electronic expansion valve. BACKGROUND

[0002] The expansion valve in the related art includes a valve core assembly and a valve seat, the valve seat has a valve port, and the valve core assembly is movably arranged in the valve seat and used for closing or opening the valve port to realize switching of a flow path. However, the expansion valve in the related art is heavy and has high material cost, which is not conducive to lightweight and cost saving. CONTENT OF THE UTILITY MODEL

[0003] The valve core assembly and the electronic expansion valve provided by the embodiments of the present application solve the problem of the heavy weight and high material cost of the expansion valve in the related art.

[0004] The valve core assembly provided by the embodiments of the present application includes a first valve core, a second valve core and a sealing member, the first valve core is connected with the second valve core, one end of the first valve core is deformed by riveting and pressure to form a first limiting end, at least part of the second valve core extends into the first valve core and is limited by the first limiting end to be separated from the first valve core, the other end of the first valve core is deformed by riveting and pressure to form a second limiting end, and the sealing member is arranged at the other end of the first valve core and is limited by the second limiting end to be separated from the first valve core.

[0005] According to some embodiments of the present application, the first valve core and / or the second valve core are made of an aluminum alloy material.

[0006] According to some embodiments of the present application, the first valve core includes a valve core body and a first flange, the first flange is protruded on the outer circumferential side surface of the valve core body, and the first flange is a sealing surface along one side surface of the valve core body in the axial direction; the sealing member is sleeved on the outer periphery of the valve core body and abuts against the sealing surface.

[0007] The valve core assembly further includes a first pressing sheet, the first pressing sheet is pressed against one side surface of the sealing member away from the first flange and is limited on the valve core body by the second limiting end.

[0008] According to some embodiments of the present application, the sealing surface is protruded with a first protrusion, the first protrusion is in contact with the sealing member; one side surface of the first pressing sheet facing the sealing member is protruded with a second protrusion, and the second protrusion is in contact with the sealing member.

[0009] According to some embodiments of the present application, the portion of the first valve core between the first limit end and the second limit end comprises a first section and a second section, the first section is between the first limit end and the second section, and the first section has a larger dimension along the valve radial direction than the second section.

[0010] According to some embodiments of the present application, one end of the first valve core has a receiving groove, and at least a portion of the second valve core is located in the receiving groove.

[0011] The valve core assembly further comprises a second pressing piece, which is fixedly connected with the first valve core through the first limit end, and limits at least a portion of the second valve core in the receiving groove.

[0012] According to some embodiments of the present application, the second valve core comprises a limit seat and a valve sleeve, the outer circumferential side of the limit seat is provided with a second flange, the second flange is located in the receiving groove, and the valve sleeve is connected to one end of the limit seat away from the sealing element.

[0013] The valve core assembly further comprises a first elastic element, which is located in the receiving groove and sleeved on the outer circumference of the limit seat, one end of the first elastic element abuts against the second pressing piece, and the other end abuts against the second flange.

[0014] According to some embodiments of the present application, one side of the limit seat towards the groove bottom surface of the receiving groove has a groove, the bottom wall of the groove is a closed end, and the groove side wall has a through hole communicating with the receiving groove and the groove.

[0015] According to some embodiments of the present application, the limit seat is provided with a second flow channel penetrating therethrough, and the side wall of the limit seat has a through hole communicating with the receiving groove and the second flow channel.

[0016] The electronic expansion valve according to the embodiments of the present application comprises:

[0017] The valve seat comprises a first valve seat, and the first valve seat has a valve port.

[0018] The valve core assembly according to any one of the above has at least a portion located in the first valve seat, and is used for closing or opening the valve port.

[0019] According to some embodiments of the present application, the valve port comprises a first valve port and a second valve port.

[0020] The first valve seat comprises a first part and a second part connected to each other, the first valve port is located in the first part, and the second valve port is located in the second part; or the first valve seat comprises a first part, a second part and a third part connected to each other, the first valve port is located in the second part, and the second valve port is located in the third part.

[0021] According to some embodiments of the present application, the valve port comprises a first valve port and a second valve port, and the first valve seat comprises a first part, a second part and a third part connected to each other;

[0022] Part of the first part is located in the second part, part of the second part is located in the third part, the first valve port is located in the second part, and the second valve port is located in the third part.

[0023] According to some embodiments of the present application, the valve seat further comprises a second valve seat, the second valve seat has a mounting cavity, and the first valve seat is arranged in the mounting cavity;

[0024] The valve port comprises a first valve port and a second valve port, the first valve port is arranged in the first valve seat, and the second valve port is arranged in the second valve seat.

[0025] According to some embodiments of the present application, the outer periphery of the first valve seat has a stepped structure, the cavity wall of the mounting cavity of the second valve seat has a limiting part, and the limiting part is limited in cooperation with the stepped structure.

[0026] According to some embodiments of the present application, the outer periphery side of the sealing element has a first throttling inclined surface, which is used to cooperate with the valve port to adjust the flow of fluid through the valve port; and / or,

[0027] The outer periphery side of the first pressing sheet of the valve core assembly has a second throttling inclined surface, which is used to cooperate with the valve port to adjust the flow of fluid through the valve port.

[0028] The above-mentioned one embodiment of the application has at least the following advantages or beneficial effects:

[0029] The valve core assembly of the embodiment of the present application, one end of the first valve core is formed into a first limiting end through riveting and pressing, so as to limit at least part of the second valve core in the first valve core, prevent the second valve core from being separated from the first valve core, and the other end of the first valve core is formed into a second limiting end through riveting and pressing, so as to limit the sealing element on the first valve core. As can be seen, the second valve core and the sealing element are connected on the first valve core through the riveting process, so that the first valve core can be made of materials with lighter weight and lower cost, thereby significantly reducing the weight of the valve core assembly and reducing the material cost, which is beneficial to realize light weight and save cost. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A perspective view of the electronic expansion valve of the first embodiment of the present application is shown.

[0031] Figure 2 A sectional view along the A-A sectional line of the electronic expansion valve is shown. Figure 1

[0032] Figure 3 An exploded view of the valve core assembly of the electronic expansion valve of the first embodiment of the present application is shown.

[0033] Figure 4 A partial view of the valve core body of the electronic expansion valve of the first embodiment of the present application is shown.

[0034] Figure 5 A perspective view of the first pressure plate of the electronic expansion valve of the first embodiment of the present application is shown.

[0035] Figure 6 A perspective view of the seal of the electronic expansion valve of the first embodiment of the present application is shown.

[0036] Figure 7 A perspective view of the electronic expansion valve of the second embodiment of the present application is shown.

[0037] Figure 8 A sectional view along the B-B sectional line of the electronic expansion valve is shown. Figure 7

[0038] Figure 9 A perspective view of the electronic expansion valve of the third embodiment of the present application is shown.

[0039] Figure 10 A sectional view along the C-C sectional line of the electronic expansion valve is shown. Figure 9

[0040] Wherein, the reference numeral explanations are as follows:

[0041] 100, valve seat; 100a, first opening; 100b, second opening; 100c, third opening; 101, first valve port; 102, second valve port; 103, valve cavity; 110, first valve seat; 111, step structure; 110a, first part; 110b, second part; 120, second valve seat; 121, mounting cavity; 122, limiting portion; 123, first channel; 124, second channel; 125, third channel;

[0042] ​​​200, valve core assembly; 210, first valve core; 211, valve core body; 2111, accommodating 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, sealing element; 221, first throttling inclined surface; 221a, first conical surface; 221b, second conical surface; 230, first pressing piece; 231, second protrusion; 232, second throttling inclined surface; 240, second pressing piece; 241, through hole; 250, first elastic element; 260, second valve core; 261, limiting seat; 2611, second flange; 2612, groove; 2614, second flow channel; 262, valve sleeve;

[0043] 310, rotor assembly; 320, outer cover; 330, nut seat;

[0044] 400, screw rod; 410, bearing;

[0045] 500, second elastic element. DETAILED DESCRIPTION

[0046] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept of an example implementation to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and descriptions of the same elements will be omitted from descriptions of the figures.

[0047] It is to be understood that the terms "including", "comprising", "having" and their conjugates, as used throughout this application and in the appended claims, are intended to designate an open group that can include additional elements without precluding other elements. For example, the terms "including", "comprising", "having" and their conjugates, as used throughout this application and in the appended claims, are intended to designate an open group that can include additional steps, units, elements, components, materials, or the like without precluding other steps, units, elements, components, materials, or the like.

[0048] FIRST EMBODIMENT

[0049] As shown in FIGS. 1 and 2, the electronic expansion valve according to the first embodiment of the present application 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 rod 400. Figure 1 Figure 2 As shown in FIGS. 1 and 2, the electronic expansion valve according to the first embodiment of the present application 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 rod 400.

[0050] ​The valve seat 100 has a valve cavity 103, and at least a portion of the valve core assembly 200 is disposed in the valve cavity 103 and is movable relative to the valve seat 100 along the axial direction of the electronic expansion valve. The outer cover 320 is fixedly connected to the valve seat 100, for example, by welding, but not limited thereto. The rotor assembly 310 is movably disposed in the outer cover 320 and is used for electromagnetic coupling with a coil assembly (not shown in the figure) sleeved on the outer peripheral side of the outer cover 320. The nut seat 330 is fixedly connected to the valve seat 100 and is disposed in the outer cover 320. The screw 400 is disposed in the outer cover 320, connected to the rotor assembly 310, and screwed to the nut seat 330.

[0051] 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 drive the screw 400 to rotate. Since the nut seat 330 is fixed relative to the valve seat 100 and is threadedly connected to the screw 400, the screw 400 can move back and forth along the axial direction of the electronic expansion valve, thereby driving the valve core assembly 200 to move back and forth in the valve cavity 103 relative to the valve seat 100.

[0052] like Figure 2 As shown, in the embodiment of the present application, the valve seat 100 includes a first valve seat 110, which defines a valve cavity 103. The cavity wall of the valve cavity 103 defines a valve port. 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 spaced apart along the axial direction of the electronic expansion valve. When the valve core assembly 200 closes the first valve port 101, the second valve port 102 is open; when the valve core assembly 200 closes the second valve port 102, the first valve port 101 is open.

[0053] The first valve seat 110 has a first opening 100a, a second opening 100b, and a third opening 100c. The first opening 100a, the second opening 100b, and the third opening 100c are arranged in sequence along the axial direction of the electronic expansion valve and are each 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.

[0054] like Figure 2 and Figure 3 As shown, the valve core assembly 200 includes a first valve core 210 , a sealing member 220 , a first pressing piece 230 , a second pressing piece 240 , a second valve core 260 and a first elastic member 250 .

[0055] The first valve core 210 is connected with the second valve core 260, one end of the first valve core 210 is deformed by riveting to form a first limiting end 214, at least part of the second valve core 260 extends into the first valve core 210 and is limited by the first limiting end 214 to be separated from the first valve core 210, the other end of the first valve core 210 is deformed by riveting to form a second limiting end 215, and the sealing element 220 is arranged at the other end of the first valve core 210 and is limited by the second limiting end 215 to be separated from the first valve core 210.

[0056] The valve core assembly 200 of the embodiment of the application, one end of the first valve core 210 is deformed by riveting to form a first limiting end 214 to limit at least part of the second valve core 260 in the first valve core 210, to prevent the second valve core 260 from being separated from the first valve core 210, and the other end of the first valve core 210 is deformed by riveting to form a second limiting end 215 to limit the sealing element 220 on the first valve core 210. As can be seen, the second valve core 260 and the sealing element 220 are both connected to the first valve core 210 by the riveting process, so that the first valve core 210 can be made of a material that is lighter in weight and lower in cost, thereby significantly reducing the weight of the valve core assembly 200 and reducing the material cost, facilitating the realization of lightweight and saving the cost.

[0057] In an embodiment, the first valve core 210 and / or the second valve core 260 are made of an aluminum alloy material.

[0058] It should be noted that, since the surface of the aluminum alloy material is relatively smooth, it is more appropriate to use the riveting process to connect the first valve core 210 and the second valve core 260 and the first valve core 210 and the sealing element 220 compared with the welding process. In addition, when connecting the first valve core 210 and the sealing element 220, if the welding process is used, the heat generated during the welding process will be conducted to the sealing element 220, thereby causing the sealing element 220 to deform or age, affecting the sealing performance. However, the riveting process used in the present case does not generate excessive heat, avoiding the problem of affecting the sealing performance due to the heating of the sealing element 220.

[0059] The first valve core 210 includes a valve core body 211 and a first flange 212, the first flange 212 is protruded on the outer circumferential side surface of the valve core body 211, and the side surface of the first flange 212 along the axial direction of the valve core body 211 is a sealing surface 2121. The sealing element 220 is sleeved on the outer periphery of the valve core body 211 and abuts against the sealing surface 2121, and the sealing element 220 is used to seal the first valve port 101 or the second valve port 102. The first pressing sheet 230 is pressed against the side surface of the sealing element 220 away from the first flange 212, and is limited by the second limiting end 215 on the valve core body 211.

[0060] In an embodiment, the first pressing piece 230 and the first spool 210 can be made of the same material or different materials. For example, the first pressing piece 230 and the first spool 210 can be made of aluminum alloy.

[0061] As shown in FIGS. 1 and 2, the first spool 210 includes a spool body 211 and a first flange 212. The first pressing piece 230 is fixedly connected to the first flange 212 of the first spool 210. Figure 2 and Figure 3 As shown in FIGS. 1 and 2, the first spool 210 includes a spool body 211 and a first flange 212. The first pressing piece 230 is fixedly connected to the first flange 212 of the first spool 210.

[0062] As shown in FIGS. 1 and 2, the first spool 210 includes a spool body 211 and a first flange 212. The first pressing piece 230 is fixedly connected to the first flange 212 of the first spool 210. Figure 2 and Figure 3 As shown in FIGS. 1 and 2, the first spool 210 includes a spool body 211 and a first flange 212. The first pressing piece 230 is fixedly connected to the first flange 212 of the first spool 210.

[0063] In the embodiment, on the one hand, the second section 2115 has a smaller size along the valve radial direction, which can ensure that the first valve port 101 has a larger flow area when the first valve port 101 is in the open state; on the other hand, by arranging the stepped surface 2112 in the middle part of the spool body 211 and towards the second limiting end 215, when the first limiting end 214 is formed by riveting, the riveting force can act on the stepped surface 2112 to avoid deformation of the second section 2115.

[0064] Further, the part of the spool body 211 between the stepped surface 2112 and the first flange 212 has a reduced diameter section 2113, which is located between the second section 2115 and the first flange 212 and has a smaller size along the valve radial direction than the second section 2115.

[0065] In the embodiment, on the one hand, the second section 2115 has a smaller size along the valve radial direction, which can ensure that the first valve port 101 has a larger flow area when the first valve port 101 is in the open state; on the other hand, by arranging the stepped surface 2112 in the middle part of the spool body 211 and towards the second limiting end 215, when the first limiting end 214 is formed by riveting, the riveting force can act on the stepped surface 2112 to avoid deformation of the second section 2115.

[0066] Due to the small radial dimension of the reduced diameter section 2113, by arranging the step surface 2112 on the middle portion of the valve core body 211, when the first limiting end 214 is formed by riveting, the riveting pressure can be transmitted to the press-fitting step surface 2112, and the bending deformation of the relatively weak reduced diameter section 2113 due to the riveting pressure can be avoided.

[0067] The first elastic member 250 is located in the accommodating groove 2111 and connected to the second pressing plate 240 and the second valve core 260 respectively. One end of the first elastic member 250 abuts against the second pressing plate 240, and the other end abuts against the second flange 2611 of the second valve core 260.

[0068] 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 to increase the compression amount of the first elastic member 250, so that the first elastic member 250 applies the first pre-tightening force to the first valve core 210 to block the first valve port 101, thereby improving the sealing performance of the first valve port 101, preventing fluid leakage of the electronic expansion valve, and improving the reliability.

[0069] As shown in Figure 2 The electronic expansion valve further comprises a second elastic member 500, which is located in the second valve core 260 and connected to the second valve core 260 and the screw rod 400. After the first valve core 210 closes the second valve port 102, the screw rod 400 can move towards the second valve port 102 relative to the first valve core 210 to increase the compression amount of the second elastic member 500, and the second elastic member 500 is used to apply the second pre-tightening force to the first valve core 210 through the second valve core 260 to block the second valve port 102, thereby improving the sealing performance of the second valve port 102, preventing fluid leakage of the electronic expansion valve, and improving the reliability.

[0070] In an embodiment, the first elastic member 250 and the second elastic member 500 can be springs, but are not limited thereto. For example, the first elastic member 250 and the second elastic member 500 can also be rubber members or other components that can provide elastic force under pressure.

[0071] As shown in Figure 2As shown, the second valve core 260 comprises a limiting seat 261 and a valve sleeve 262, the outer circumferential side of the limiting seat 261 is provided with a second flange 2611 at one end close to the first valve port 101, the second flange 2611 is located in the accommodating groove 2111, and the valve sleeve 262 is connected to the one end of the limiting seat 261 away from the sealing element 220. The first elastic element 250 is located in the accommodating groove 2111 and is sleeved on the outer circumference of the limiting seat 261, one end of the first elastic element 250 abuts against the second pressing plate 240, and the other end abuts against the second flange 2611. The second elastic element 500 is located in the valve sleeve 262, and one end of the second elastic element 500 abuts against the one end of the limiting seat 261 away from the first valve port 101, and the other end abuts against the screw rod 400.

[0072] As shown in the drawings, Figure 2 The first valve core 210 has a first flow channel 2116 penetrating the first valve core 210 along the valve axis. The limiting seat 261 has a second flow channel 2614 penetrating the limiting seat 261 along the valve axis. The side wall of the limiting seat 261 has a through hole 2613 in communication with the second flow channel 2614.

[0073] The first flow channel 2116, the second flow channel 2614, the accommodating groove 2111 and the through hole 2613 are in communication to balance the fluid pressure in the valve.

[0074] As shown in the drawings, Figure 4 The sealing surface 2121 is provided with a first protrusion 213, and the first protrusion 213 is in contact with the sealing element 220.

[0075] In the embodiment, the first protrusion 213 is arranged on the sealing surface 2121, and when the sealing element 220 is attached to the sealing surface 2121, the first protrusion 213 can improve the sealing performance between the sealing element 220 and the first flange 212.

[0076] In an embodiment, the first protrusion 213 has a ring structure surrounding the outer circumference of the valve core body 211, and the cross-sectional shape of the first protrusion 213 is any one of a triangle, a rectangle and a semicircle.

[0077] As shown in the drawings, Figure 5 The first pressing plate 230 is provided with a second protrusion 231 on the side surface facing the sealing element 220, and the second protrusion 231 is in contact with the sealing element 220.

[0078] In the embodiment, the first pressing plate 230 is provided with the second protrusion 231 on the side surface facing the sealing element 220, and when the sealing element 220 is attached to the side surface, the second protrusion 231 can improve the sealing performance between the first pressing plate 230 and the sealing element 220.

[0079] In an embodiment, the second protrusion 231 is in a ring shape surrounding the outer periphery of the spool body 211, and the cross section of the second protrusion 231 is in any one of a triangle, a rectangle, and a semicircle.

[0080] As shown in FIG. 2, the outer peripheral side of the sealing member 220 has a first throttling slope 221 for cooperating with the valve ports to regulate the flow rate of the fluid passing through the valve ports. Figure 6 After passing through the first throttling slope 221, the fluid has a reduced pressure. Thus, the pressure change before and after the fluid will generate a driving force on the spool assembly 200 in the direction of the valve ports, which is beneficial to improve the action ability and flow distribution ability of the valve.

[0081] In an embodiment, the first throttling slope 221 includes a first conical surface 221a for sealingly cooperating with the first valve port 101 and a second conical surface 221b for sealingly cooperating with the second valve port 102.

[0082] As shown in FIG. 2, the outer peripheral side of the sealing member 220 has a first throttling slope 221 for cooperating with the valve ports to regulate the flow rate of the fluid passing through the valve ports. Figure 2 The second throttling slope 232 is used for cooperating with the valve ports to regulate the flow rate of the fluid passing through the valve ports.

[0083] In an embodiment, the second throttling slope 232 is an outer conical surface, but is not limited thereto.

[0084] As shown in FIG. 2, the first valve seat 110 includes a first part 110a and a second part 110b connected to each other, the first valve port 101 is located in the first part 110a, and the second valve port 102 is located in the second part 110b. By designing the first valve seat 110 in a split structure, the overall length of the valve can be shortened. Figure 2 In another embodiment, the first valve seat 110 can also be a three-segment split structure, for example, the first valve seat 110 includes a first part 110a, a second part 110b, and a third part connected to each other, and the second part 110b is between the first part 110a and the third part. The first valve port 101 is located in the second part 110b, and the second valve port 102 is located in the third part.

[0085] In another embodiment, the first valve seat 110 can also be a three-segment split structure, for example, the first valve seat 110 includes a first part 110a, a second part 110b, and a third part connected to each other, and the second part 110b is between the first part 110a and the third part. The first valve port 101 is located in the second part 110b, and the second valve port 102 is located in the third part.

[0086] In another embodiment, the first valve seat 110 can also be a three-segment split structure, for example, the first valve seat 110 includes a first part 110a, a second part 110b, and a third part connected to each other, and the second part 110b is between the first part 110a and the third part. The first valve port 101 is located in the second part 110b, and the second valve port 102 is located in the third part.

[0087] [Second embodiment]

[0088] like Figure 7 and Figure 8 As shown, the electronic expansion valve of the second embodiment of the present application is similar to the electronic expansion valve of the first embodiment and is not described in detail. The difference between the electronic expansion valve and the first embodiment is as follows:

[0089] The valve seat 100 further includes a second valve seat 120 having a mounting cavity 121 within which the first valve seat 110 is mounted. 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.

[0090] When the first valve port 101 is in a closed state and the second valve port 102 is in an open state, the second channel 124 is connected to the third channel 125; when the second valve port 102 is in a closed state and the first valve port 101 is in an open state, the first channel 123 is connected to the second channel 124.

[0091] In one embodiment, the limiting seat 261 has a groove 2612 on one side of the bottom surface of the receiving groove 2111, and the bottom wall of the groove 2612 is a blocking end. The groove sidewall of the groove 2612 has a through hole 2613 communicating with the receiving groove 2111 and the groove 2612.

[0092] In the embodiment of the present application, a through hole 2613 is formed in the side wall of the limit seat 261, and one end of the limit seat 261 connected to the valve sleeve 262 is closed. In this way, the fluid can flow from the groove 2612 to the receiving groove 2111 through the through hole 2613 without flowing into the valve sleeve 262, thereby preventing impurities from entering the valve sleeve 262 through the limit seat 261 and preventing impurities from contaminating the bearing 410 of the screw 400.

[0093] As an example, the dimension of the first valve seat 110 in the second embodiment of the present application along the axial direction of the electronic expansion valve is smaller than that of the first valve seat 110 in the first embodiment.

[0094] [Third embodiment]

[0095] like Figure 9 and Figure 10 As shown, the electronic expansion valve of the third embodiment of the present application is similar to the electronic expansion valve of the second embodiment and is not described in detail. The difference between the electronic expansion valve and the second embodiment is as follows:

[0096] 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 .

[0097] 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 portion 122, which is in limiting cooperation with the stepped structure 111, so as to limit the position degree of the valve port and the valve body.

[0098] In the embodiment of the present application, the first valve port 101 is arranged on the first valve seat 110, and the second valve port 102 is arranged on the second valve seat 120. After the spool assembly 200 is assembled with the first valve seat 110 and before being mounted into the mounting cavity 121 of the second valve seat 120, the opening valve pulse point of the first valve port 101 can be determined by testing the gas flow, and the opening valve pulse point of the second valve port 102 can be determined according to the machining size precision of the parts.

[0099] Specifically, for the first valve port 101, when the rotor assembly 310 moves to the upper limit position, which is the zero pulse position, and then moves downward, when the flow sensor detects the flow of the first valve port 101, the distance of the movement of the screw rod 400 corresponds to the opening valve pulse point.

[0100] For the second valve port 102, since the stepped structure 111 of the first valve seat 110 is in limiting cooperation with the limiting portion 122 of the second valve seat 120, the relative position precision between the second valve port 102 and the first valve seat 110 can be limited by controlling the installation precision of the stepped structure 111 and the limiting portion 122, so as to determine the opening valve pulse point.

[0101] In summary, the spool assembly 200 and the electronic expansion valve of the embodiment of the present application have at least the following advantages and beneficial effects:

[0102] The spool assembly 200 of the embodiment of the present application, one end of the first spool 210 is formed into a first limiting end 214 by riveting and pressing, so as to limit at least part of the second spool 260 in the first spool 210, preventing the second spool 260 from being separated from the first spool 210, and the other end of the first spool 210 is formed into a second limiting end 215 by riveting and pressing, so as to limit the sealing member 220 on the first spool 210. As can be seen, the second spool 260 and the sealing member 220 are both connected on the first spool 210 by the riveting and pressing process, so that the first spool 210 can be made of a material with lighter weight and lower cost, thereby significantly reducing the weight of the spool assembly 200 and the material cost, facilitating the realization of light weight, and saving the cost.

[0103] It can be understood that the various embodiments / implementation modes provided by the present application can be combined with each other without contradiction, which will not be illustrated one by one here.

[0104] In the embodiments of the application, the terms "first", "second", "third" are only used for descriptive purpose and should not be understood as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted broadly, for example, "connection" can be fixed connection, detachable connection, or integral connection; "connection" can be direct connection or indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0105] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the embodiments of the application and simplify the description, and are not intended to indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the application.

[0106] In the description of the embodiments of the application, the terms "one embodiment", "some embodiments", "specific embodiments" and the like are intended to mean that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the application. In the description of the application, the illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0107] The above is only the preferred embodiment of the application, and is not intended to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement and the like made within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. A valve trim assembly characterized by, The valve core assembly comprises a first valve core, a second valve core and a sealing member, the first valve core is connected with the second valve core, one end of the first valve core is deformed by riveting and forms a first limiting end, at least part of the second valve core extends into the first valve core and is limited by the first limiting end to be separated from the first valve core, the other end of the first valve core is deformed by riveting and forms a second limiting end, and the sealing member is arranged at the other end of the first valve core and is limited by the second limiting end to be separated from the first valve core.

2. The valve trim assembly of claim 1, wherein, The first valve core and / or the second valve core are made of an aluminum alloy material.

3. The valve trim assembly of claim 1, wherein, The first valve core comprises a valve core body and a first flange, the first flange is arranged on the outer circumferential side surface of the valve core body, and the first flange is a sealing surface along one side surface of the valve core body in the axial direction; the sealing member is sleeved on the outer periphery of the valve core body and is attached to the sealing surface; The valve core assembly further comprises a first pressing sheet, the first pressing sheet is pressed against one side surface of the sealing member away from the first flange and is limited on the valve core body by the second limiting end.

4. The valve trim assembly of claim 3, wherein, The sealing surface is provided with a first protrusion, the first protrusion is in contact with the sealing member; one side surface of the first pressing sheet towards the sealing member is provided with a second protrusion, the second protrusion is in contact with the sealing member.

5. The valve trim assembly of claim 1, wherein, The part of the first valve core between the first limiting end and the second limiting end comprises a first section and a second section, the first section is located between the first limiting end and the second section, and the size of the first section along the valve radial direction is greater than the size of the second section along the valve radial direction.

6. The valve trim assembly of claim 1, wherein, One end of the first valve core has a receiving groove, and at least part of the second valve core is located in the receiving groove; The valve core assembly further comprises a second pressing sheet, the second pressing sheet is fixedly connected with the first valve core through the first limiting end, and the second pressing sheet limits at least part of the second valve core in the receiving groove.

7. The valve trim assembly of claim 6, wherein, The second valve core comprises a limiting seat and a valve sleeve, the outer circumferential side of the limiting seat is provided with a second flange, the second flange is located in the receiving groove, and the valve sleeve is connected to one end of the limiting seat away from the sealing member; The valve core assembly further comprises a first elastic member, the first elastic member is located in the receiving groove and is sleeved on the outer periphery of the limiting seat, one end of the first elastic member is in abutment with the second pressing sheet, and the other end of the first elastic member is in abutment with the second flange.

8. The valve trim assembly of claim 7, wherein, One side of the limiting seat towards the groove bottom surface of the receiving groove has a groove, the bottom wall of the groove is a blocking end, and the groove side wall has a through hole in communication with the receiving groove and the groove.

9. The valve trim assembly of claim 7, wherein, The limiting seat is provided with a second flow channel penetrating through, and the side wall of the limiting seat has a through hole in communication with the receiving groove and the second flow channel.

10. An electronic expansion valve characterized by The valve core assembly comprises: a valve seat comprising a first valve seat, the first valve seat having a valve port; the valve core assembly according to any one of claims 1-9, at least part of the valve core assembly being arranged in the first valve seat for closing or opening the valve port.

11. The electronic expansion valve according to claim 10, wherein The valve port comprises a first valve port and a second valve port; The first valve seat comprises a first part and a second part connected with each other, the first valve port is located in the first part, and the second valve port is located in the second part; Alternatively, the first valve seat comprises a first part, a second part and a third part connected to each other, the first valve port is located in the second part, and the second valve port is located in the third part.

12. The electronic expansion valve according to claim 10, wherein The valve port comprises a first valve port and a second valve port, and the first valve seat comprises a first part, a second part and a third part connected to each other; Part of the first part is located in the second part, part of the second part is located in the third part, the first valve port is located in the second part, and the second valve port is located in the third part.

13. The electronic expansion valve of claim 10, wherein, The valve seat further comprises a second valve seat, the second valve seat has a mounting cavity, and the first valve seat is mounted in the mounting cavity; The valve port comprises a first valve port and a second valve port, the first valve port is provided in the first valve seat, and the second valve port is provided in the second valve seat.

14. The electronic expansion valve according to claim 13, wherein The outer periphery of the first valve seat has a stepped structure, the cavity wall of the mounting cavity of the second valve seat has a limiting part, and the limiting part is limited in cooperation with the stepped structure.

15. The electronic expansion valve of claim 10, wherein, The outer peripheral side of the sealing element has a first throttling inclined surface for cooperating with the valve port to adjust the flow of fluid through the valve port; and / or, The outer peripheral side of the first pressing sheet of the valve core assembly has a second throttling inclined surface for cooperating with the valve port to adjust the flow of fluid through the valve port.

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