Electronic expansion valve element assembly and electronic expansion valve

Abstract

The utility model discloses a valve element assembly of an electronic expansion valve and the electronic expansion valve. The valve element assembly comprises a valve element, a spring sleeve, a sealing structure, a spring and a valve rod. The valve element is of a cylindrical structure with the two ends open and comprises a first opening and a second opening, an annular sealing groove is formed in the end, close to the spring sleeve, of the surface of the valve element or the end, close to the valve element, of the surface of the spring sleeve, and the sealing structure is contained in the annular sealing groove to seal the valve element and the spring sleeve. The end, close to the valve element, of the spring sleeve is provided with a turnover end, and after one end of the spring sleeve stretches into the valve element from the first opening, the turnover end is turned over to the inner wall of the valve element and fixedly connected with the inner wall of the valve element. The spring is contained in the spring sleeve, and one end of the valve rod extends into the spring sleeve and abuts against one end of the spring. The valve element assembly is simple in structure, good in coaxiality, good in stability, good in firmness and lower in cost, a sealing structure is not damaged, and the sealing performance of the sealing structure is not affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic expansion valve valve core subassembly field especially relates to a kind of electronic expansion valve valve core subassembly and electronic expansion valve. BACKGROUND

[0002] Electronic expansion valve belongs to electronic regulating mode, and liquid supply of evaporator is regulated according to preset program, with excellent characteristics that cannot be compared with thermal expansion valve, and electronic expansion valve includes valve core subassembly, valve body subassembly and transmission subassembly.

[0003] At present, spring cover and valve core on valve core subassembly are connected by thread, which is convenient to install, but the coaxiality is not high, the stability is poor, and the spring cover and valve core are prone to loosen or even fall off after long-term use, resulting in error or inability to use. Due to the limitation of prior art, some directly use riveting or welding to fix the connection between the spring cover and the valve core, but the high temperature generated by riveting or welding can damage the sealing structure of the connection between the spring cover and the valve core.

[0004] Therefore, in view of the above-mentioned technical problems, it is necessary to provide a new technical solution. SUMMARY

[0005] To at least solve one of the technical problems existing in the prior art, the utility model provides an electronic expansion valve valve core subassembly and an electronic expansion valve, which are simple in structure, convenient to use, good in coaxiality, good in stability, good in firmness and low in cost. The specific technical solutions are as follows:

[0006] On the one hand, the utility model provides an electronic expansion valve valve core subassembly, which comprises a valve core, a spring cover, a sealing structure, a spring and a valve rod.

[0007] The valve core is a cylindrical structure with two open ends, and comprises a first opening and a second opening. An annular sealing groove is arranged on the end of the valve core surface close to the spring cover or on the end of the spring cover surface close to the valve core. The sealing structure is accommodated in the annular sealing groove to seal the valve core and the spring cover.

[0008] The end of the spring cover close to the valve core is provided with a folded end. After the end of the spring cover extends into the valve core from the first opening, the folded end is folded onto the inner wall of the valve core, and the folded end is fixedly connected with the inner wall of the valve core.

[0009] The spring is accommodated in the spring cover, and one end of the valve rod extends into the spring cover and abuts against one end of the spring.

[0010] As a preferred scheme of the valve core subassembly, after the end of the spring cover extends into the valve core from the first opening, the folded end is folded onto the inner wall of the valve core, and the folded end is fixedly connected with the inner wall of the valve core by riveting.

[0011] As a preferred scheme of the valve core assembly, the valve core comprises a valve core body and a valve core mounting end in sequence along an axial direction, the valve core mounting end is located at one end of the valve core close to the spring sleeve, an outer diameter of the valve core mounting end is smaller than an outer diameter of the valve core body, and an end face of the valve core body close to the valve core mounting end is a first step;

[0012] The end portion of the valve core assembly close to the valve core mounting end is provided with a limiting structure, the limiting structure cooperates with the first step to form an annular sealing groove, and the sealing structure is sealed in the annular sealing groove.

[0013] As a preferred scheme of the valve core assembly, the limiting structure is a boss, the boss is fixedly arranged on a circumferential surface of the spring sleeve, and the boss abuts against one end of the valve core when the spring sleeve is fixedly connected to the valve core.

[0014] As a preferred scheme of the valve core assembly, the limiting structure is a limiting plate, one end of the spring sleeve close to the valve core is provided with a second step, the limiting plate is limited between the end portion of the valve core and the second step, and the sealing structure is sealed between the first step and the limiting plate.

[0015] As a preferred scheme of the valve core assembly, the surface of the spring sleeve is fixedly provided with a boss in a circumferential direction, the boss, the surface of the spring sleeve and the end face of the valve core cooperate to form an annular sealing groove, and the sealing structure is sealed in the annular sealing groove.

[0016] As a preferred scheme of the valve core assembly, a hollow cavity is arranged in the spring sleeve, first and second spring sleeve openings are respectively arranged in the end portion of the spring sleeve along the axial direction, the first and second spring sleeve openings are in communication with the hollow cavity, a spring is arranged in the hollow cavity, and one end of the valve rod extends into the hollow cavity from the first spring sleeve opening and abuts against one end of the spring.

[0017] As a preferred scheme of the valve core assembly, one end of the valve rod close to the spring sleeve is provided with a valve rod folded end;

[0018] A sliding member is further arranged in the hollow cavity of the spring sleeve, the sliding member can slide in the hollow cavity along the axial direction of the spring sleeve, and a through hole is arranged in the sliding member;

[0019] After one end of the valve rod passes through the through hole, the valve rod folded end of the valve rod is folded onto the surface of the sliding member, and the valve rod folded end of the valve rod is welded and fixed on the sliding member.

[0020] As a preferred scheme of the valve core assembly, the sealing structure is an annular sealing member or an annular sealing assembly, and an outer diameter of the sealing structure is greater than an outer diameter of the valve core; or

[0021] A communication hole is arranged in the surface of the spring sleeve, and the communication hole is in communication with the hollow cavity.

[0022] The sealing assembly comprises an inner seal and an outer ring.

[0023] In another aspect, the utility model provides an electronic expansion valve, including valve seat subassembly, transmission subassembly and valve core subassembly as above-mentioned technical scheme,

[0024] Transmission subassembly is installed on valve seat subassembly, and valve core subassembly is contained in valve seat subassembly and transmission subassembly,

[0025] The installation cavity and the flow-through cavity are in communication, the valve seat subassembly surface is provided with the installation port, the flow passage inlet and the flow passage outlet, the installation port is in communication with the installation cavity, the installation port is provided on the side of the installation cavity close to the valve rod, the flow passage inlet and the flow passage outlet are in communication with the flow-through cavity, the installation port and the flow passage outlet are arranged at opposite ends of the valve seat subassembly, the valve core and the spring sleeve are contained in the valve seat subassembly, there is a gap between the valve core and the inner wall of the installation cavity, and the sealing structure is in interference fit with the inner wall of the installation cavity.

[0026] The transmission subassembly includes a transmission component and a shell, the transmission component is installed in the shell, the other end of the valve rod extends into the shell of the transmission subassembly from the installation port, the transmission component can drive the valve rod to move towards the direction away from or close to the flow passage outlet, under the driving of the valve rod, the valve core moves to the flow passage outlet to seal the flow passage outlet or moves away from the flow passage outlet to make the flow passage outlet communicate with the flow-through cavity.

[0027] As a preferred scheme of the electronic expansion valve, the surface of the spring sleeve is provided with a communication hole, and the hollow cavity and the installation cavity are in communication through the communication hole.

[0028] If the valve core moves to seal the flow passage outlet, the installation cavity and the flow passage outlet are in communication through the valve core and the spring sleeve.

[0029] As a preferred scheme of the electronic expansion valve, the valve seat subassembly includes an upper valve seat and a lower valve seat, and the lower valve seat is sealingly installed on the upper valve seat.

[0030] The installation cavity, the flow-through cavity, the installation port and the flow passage inlet are arranged on the upper valve seat, and the flow passage outlet is arranged on the lower valve seat.

[0031] The lower valve seat is provided with a valve seat step close to the upper valve seat, and an annular sealing gasket is fixedly arranged on the valve seat step, and the valve core abuts against the annular sealing gasket when the valve core seals the flow passage outlet, so that the flow passage outlet is not in communication with the flow-through cavity.

[0032] Compared with the prior art, the technical scheme of the utility model has at least one or more of the following beneficial effects:

[0033] The valve core assembly has a simple structure, conveniently and easily achieving the limiting of the sealing structure without adding extra parts or only adding a limiting plate. The spring-fitted valve core is fixed by riveting inside the valve core, which is very friendly to the coaxiality of the valve core and the spring sleeve. The stability and firmness are better than the threaded connection, and it is far away from the sealing structure, so it does not damage the sealing structure or affect the sealing performance. The valve core assembly of this patent has simpler parts, lower cost, and superior coaxiality.

[0034] The sealing structure isolates the installation cavity from the flow cavity, preventing cross-flow.

[0035] The mounting cavity is connected to the flow channel outlet, ensuring consistent pressure and creating pressure balance between the upper and lower ends of the valve core, thus reducing the difficulty of opening the valve.

[0036] When the valve is closed, the valve core contacts the annular sealing gasket at the valve port, isolating the flow channel inlet from the valve port to prevent leakage.

[0037] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0038] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a cross-sectional view of one embodiment of the valve core assembly described in this patent;

[0040] Figure 2 This is a cross-sectional enlarged structural schematic diagram of one embodiment of the valve core assembly described in this patent;

[0041] Figure 3 This is a cross-sectional structural schematic diagram of one embodiment of the electronic expansion valve described in this patent;

[0042] Figure 4 This is a cross-sectional view of another embodiment of the valve core assembly described in this patent;

[0043] Figure 5 This is a cross-sectional enlarged structural schematic diagram of another embodiment of the valve core assembly described in this patent.

[0044] Wherein, 1 - valve core assembly, 2 - valve seat assembly, 3 - transmission assembly, 11 - valve core, 112 - second opening, 113 - valve core body, 114 - valve core mounting end, 115 - first step, 12 - spring cover, 121 - folding end, 122 - hollow cavity, 124 - second spring cover opening, 125 - boss, 126 - second step, 127 - communication hole, 128 - sliding piece, 129 - limiting piece, 13 - sealing structure, 131 - inner sealing piece, 132 - outer ring, 14 - spring, 15 - valve rod, 151 - valve rod folding end, 16 - limiting plate, 21 - mounting cavity, 22 - flow-through cavity, 24 - flow passage inlet, 25 - flow passage outlet, 26 - upper valve seat, 27 - lower valve seat, 271 - valve seat step, 272 - annular sealing gasket, 31 - transmission component, 32 - housing. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the utility model, unless another definite provision and limitation, the term "set with", "have", "connect", "install", "set", "open", "fix" and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can indirectly connect through the intermediate medium, can be two element internal communication or two element mutual action relation. For ordinary skilled in the art, the above-mentioned term can be understood according to the specific meaning in the utility model in the specific meaning in the utility model.

[0048] The additional aspects and advantages of the utility model will be partly given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model.

[0049] Please refer to Figures 1-5 . As Figures 1-5 Indicated, one aspect, the utility model provides a kind of electronic expansion valve spool assembly, it is characterized in that, the spool assembly 1 includes spool 11, spring sleeve 12, sealing structure 13, spring 14 and valve stem 15;

[0050] Spool 11 is the tubular structure of both ends opening, spool 11 includes first opening and second opening 112, the end of spool 11 surface close to spring sleeve 12 is provided with annular sealing groove or the end of spring sleeve 12 surface close to spool 11 is provided with annular sealing groove, sealing structure 13 is housed in annular sealing groove to seal spool 11 and spring sleeve 12;

[0051] The end of spring sleeve 12 close to spool 11 is provided with turn-up end 121, after the end of spring sleeve 12 from first opening enters into spool 11, turn-up end 121 is folded to the inner wall of spool 11, and turn-up end 121 is riveted and fixedly connected with the inner wall of spool 11;

[0052] Spring 14 is housed in spring sleeve 12, and one end of valve stem 15 enters into spring sleeve 12 and is abutted with the end of spring.

[0053] Spool assembly structure is simple, in the case where not increasing additional parts or only increasing a limit plate, the limit of sealing structure is conveniently and simply realized.Spring sleeve and spool are riveted and fixed in spool, which is very friendly to the coaxiality of spool and spring sleeve, and the stability and firmness are better than threaded connection, and it is far from sealing structure, does not damage sealing structure, and does not affect the sealing property of sealing structure.The parts of the spool assembly of the utility model are more simple, the cost is lower, and the coaxiality is more excellent.

[0054] Preferably, after the end of spring sleeve 12 from first opening enters into spool 11, turn-up end 121 is folded to the inner wall of spool 11, and turn-up end 121 is riveted and fixedly connected with the inner wall of spool 11.

[0055] In the preferred embodiment, the spring sleeve 12 is provided with a hollow cavity 122, and the spring sleeve 12 is provided with a first spring sleeve opening and a second spring sleeve opening 124 at the end along the axial direction, both of which are communicated with the hollow cavity 122. The spring 14 is accommodated in the hollow cavity 122, and one end of the valve rod 15 extends into the hollow cavity 122 from the first spring sleeve opening and abuts against one end of the spring 14.

[0056] In the example, the inner diameter of the second spring sleeve opening 124 is smaller than the inner diameter of the hollow cavity 122, one end of the spring 14 abuts against the inner wall of the hollow cavity 122 away from the valve rod 15, and the other end of the spring 14 abuts against the valve rod 15.

[0057] In the example, the folded end 121 and the second spring sleeve opening 124 are located at the same end of the spring sleeve 12.

[0058] In the example, the valve rod 15 is a screw rod.

[0059] In the example, the outer diameter of the first opening is smaller than the outer diameter of the second opening 112.

[0060] In the preferred embodiment, as shown in Figures 1-5 , the valve core 11 includes a valve core body 113 and a valve core mounting end 114 along the axial direction in sequence, the valve core mounting end 114 is located at the end of the valve core 11 close to the spring sleeve 12, the outer diameter of the valve core mounting end 114 is smaller than the outer diameter of the valve core body 113, and the end face of the valve core body 113 close to the valve core mounting end 114 is a first step 115.

[0061] The end of the valve core assembly 1 close to the valve core mounting end 114 is provided with a limiting structure, the limiting structure cooperates with the first step 115 to form an annular sealing groove, and the sealing structure 13 is sealed in the annular sealing groove.

[0062] In the example, the valve core body 113 and the valve core mounting end 114 are integrally connected. Of course, the present patent is not limited thereto.

[0063] Preferably, the limiting structure is a boss 125, the boss 125 is fixedly arranged on the circumferential surface of the spring sleeve 12, and when the spring sleeve 12 is fixedly connected to the valve core 11, the boss 125 abuts against one end of the valve core 11.

[0064] In the example, as shown in Figures 1-3 , the boss 125 is fixedly sleeved on the surface of the spring sleeve, and when one end of the spring sleeve 12 extends into the inner cavity of the valve core, the boss 125 abuts against the valve core. In the example, the side wall of the boss, the valve core mounting end and the first step form an annular sealing groove, and the sealing structure 13 is sealed in the annular sealing groove. Preferably, the boss 125 is integrally sleeved on the surface of the spring sleeve 12.

[0065] Preferably, the limiting structure is a limiting plate 16, the spring sleeve 12 is provided with a second step 126 at one end close to the valve core 11, and the limiting plate 16 is limited between the end of the valve core 11 and the second step 126, and the sealing structure 13 is sealed between the first step 115 and the limiting plate 16.

[0066] As shown in the examples, Figures 4-5 the spring sleeve 12 sequentially includes a spring sleeve main body part and a spring sleeve mounting part along the axial direction, the outer diameter of the spring sleeve mounting part is smaller than that of the spring sleeve main body part, the end face of the spring sleeve main body part close to the spring sleeve mounting part is the second step 126, the spring sleeve mounting part extends into the valve core, the limiting plate is stably clamped between the second step 126 and the end face of the valve core mounting end 114, the limiting plate, the surface of the valve core mounting end 114 and the first step 115 form an annular sealing groove, and the sealing structure 13 is sealed in the annular sealing groove.

[0067] In other embodiments, the surface of the spring sleeve 12 is fixedly provided with a boss 125 in the circumferential direction, the boss 125, the surface of the spring sleeve and the end face of the valve core cooperate to form an annular sealing groove, and the sealing structure 13 is sealed in the annular sealing groove.

[0068] In the examples, the boss is integrally sleeved on the surface of the spring sleeve.

[0069] In the preferred embodiments, the surface of the spring sleeve 12 is provided with a communication hole 127, and the communication hole 127 is in communication with the hollow cavity 122. Further preferably, the communication hole 127 is provided at a position close to the boss or the limiting plate of the spring sleeve 12.

[0070] In the preferred embodiments, the sealing structure 13 is an annular sealing element or an annular sealing assembly, and the outer diameter of the sealing structure 13 is greater than the outer diameter of the valve core 11.

[0071] Preferably, as shown in the examples, Figures 1-5 the sealing assembly includes an inner sealing element 131 and an outer ring 132. Preferably, the outer ring is a plastic ring. In the examples, the inner sealing element is an O-shaped sealing ring. In the examples, the sealing assembly is a Glay ring. The outer ring has lubricating and wear-resistant effects.

[0072] In the examples, the sealing element is an O-shaped sealing ring.

[0073] In the preferred embodiments, as shown in the examples, Figures 1-5 the valve rod 15 is provided with a valve rod folded end 151 at one end close to the spring sleeve 12;

[0074] The hollow cavity 122 of the spring sleeve 12 is further provided with a sliding element 128, the sliding element 128 is capable of sliding along the axial direction of the spring sleeve 12 in the hollow cavity 122, and the sliding element 128 is provided with a through hole;

[0075] After the valve rod 15 passes through the hole, the valve rod folded end 151 of the valve rod 15 is folded to the surface of the sliding piece 128, and the valve rod folded end 151 of the valve rod 15 is welded and fixed to the sliding piece 128.

[0076] Further preferably, the sliding piece 128 is further provided with a limiting piece 129 close to one end of the valve rod, and after the spring 14 and the sliding piece 128 are sequentially accommodated in the hollow cavity, the sliding piece 128 is located on the side of the spring 14 away from the valve core, the limiting piece 129 is fixedly installed on the end of the spring sleeve 12 close to the sliding piece 128, and the limiting piece 129 is configured to be able to limit the sliding piece 128 and the spring 14 from falling out of the hollow cavity. Preferably, the limiting piece 129 is fixedly accommodated in the hollow cavity or outside the hollow cavity. In the example, the limiting piece 129 is fixedly accommodated in the hollow cavity.

[0077] On the one hand, as shown in the drawings, the utility model further provides an electronic expansion valve, including valve seat assembly 2, transmission assembly 3 and valve core assembly 1 as described in the above technical scheme; Figure 3

[0078] The transmission assembly 3 is installed on the valve seat assembly 2, and the valve core assembly 1 is accommodated in the valve seat assembly 2 and the transmission assembly 3.

[0079] The valve seat assembly 2 is provided with an installation cavity 21 and a flow-through cavity 22, the installation cavity 21 and the flow-through cavity 22 are communicated, the valve seat assembly 2 is provided with an installation port, a flow passage inlet 24 and a flow passage outlet 25 on the surface, the installation port is communicated with the installation cavity 21, the installation port is arranged on the side of the installation cavity 21 close to the valve rod, the flow passage inlet 24 and the flow passage outlet 25 are communicated with the flow-through cavity 22, the installation port and the flow passage outlet 25 are arranged on the opposite ends of the valve seat assembly 2, the valve core 11 and the spring sleeve 12 are accommodated in the valve seat assembly 2, there is a gap between the valve core 11 and the inner wall of the installation cavity 21, and the sealing structure 13 is in interference fit with the inner wall of the installation cavity 21.

[0080] The transmission assembly 3 includes a transmission component 31 and a housing 32, the transmission component 31 is installed in the housing 32, the other end of the valve rod 15 extends into the housing 32 of the transmission assembly 3 from the installation port, the transmission component 31 can drive the valve rod 15 to move towards the direction away from or close to the flow passage outlet 25, under the driving of the valve rod 15, the valve core 11 moves to the flow passage outlet 25 to seal the flow passage outlet 25 or moves away from the flow passage outlet 25 to make the flow passage outlet 25 communicated with the flow-through cavity 22.

[0081] Preferably, the valve seat assembly 2 is a cylindrical assembly, the installation port and the flow passage outlet 25 are arranged on the opposite ends of the valve seat assembly 2 along the axial direction, and the flow passage inlet 24 is arranged on the circumferential surface of the valve seat assembly 2. In the example, a plurality of flow passage inlets 24 are arranged on the circumferential surface of the valve seat assembly 2. Preferably, the plurality of flow passage inlets 24 are uniformly and spacedly distributed on the circumferential surface of the valve seat assembly 2. ​

[0082] The sealing structure separates the installation cavity from the flow-through cavity, avoiding mutual flow cross.

[0083] In the preferred embodiment, the spring sleeve 12 is provided with a communication hole 127, and the hollow cavity 122 and the installation cavity 21 are connected through the communication hole 127.

[0084] When the valve core 11 is sealed to the flow passage outlet 25, the installation cavity 21 and the flow passage outlet 25 are connected through the valve core 11 and the spring sleeve 12.

[0085] The installation cavity is connected with the flow passage outlet, the pressure is consistent, the pressure balance of the upper and lower ends of the valve core is formed, and the difficulty of opening the valve is reduced.

[0086] In the preferred embodiment, the valve seat assembly 2 includes an upper valve seat 26 and a lower valve seat 27, and the lower valve seat 27 is sealed and installed on the upper valve seat 26.

[0087] The installation cavity 21, the flow-through cavity 22, the installation port, and the flow passage inlet 24 are all arranged on the upper valve seat 26, and the flow passage outlet 25 is arranged on the lower valve seat 27.

[0088] Preferably, the lower valve seat 27 is provided with a valve seat step 271 near one end of the upper valve seat 26, and an annular sealing gasket 272 is fixedly arranged on the valve seat step 271, and when the valve core 11 seals the flow passage outlet 25, the valve core 11 abuts against the annular sealing gasket 272, so that the flow passage outlet 25 is not connected with the flow-through cavity 22.

[0089] In the example, the lower valve seat 22 is sealingly welded to one end of the upper valve seat 21.

[0090] When the valve is closed, the valve core contacts the annular sealing gasket of the valve port, thereby isolating the flow passage inlet and the valve port, and avoiding leakage.

[0091] It should be noted that all the features in the above embodiments or in the embodiments can be combined arbitrarily without conflict.

[0092] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "yet another embodiment", "another embodiment", "other embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does 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. In addition, persons skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0093] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify and transform the above-mentioned embodiments within the scope of the utility model.

Claims

1. An electronic expansion valve spool assembly, comprising: The valve core assembly (1) comprises a valve core (11), a spring sleeve (12), a sealing structure (13), a spring (14) and a valve rod (15); The valve core (11) is a cylindrical structure with open ends, the valve core (11) comprises a first opening and a second opening (112), and an annular sealing groove is arranged on the surface of the valve core (11) close to the spring sleeve (12) or on the surface of the spring sleeve (12) close to the valve core (11); the sealing structure (13) is accommodated in the annular sealing groove to seal the valve core (11) and the spring sleeve (12); The spring sleeve (12) is provided with a folded end (121) close to the valve core (11), and after one end of the spring sleeve (12) extends into the valve core (11) from the first opening, the folded end (121) is folded onto the inner wall of the valve core (11) and is fixedly connected with the inner wall of the valve core (11); The spring (14) is accommodated in the spring sleeve (12), and one end of the valve rod (15) extends into the spring sleeve (12) and abuts against one end of the spring.

2. The electronic expansion valve spool assembly of claim 1, wherein, The valve core (11) comprises a valve core body (113) and a valve core mounting end (114) in sequence in the axial direction, the valve core mounting end (114) is located at one end of the valve core (11) close to the spring sleeve (12), the outer diameter of the valve core mounting end (114) is smaller than the outer diameter of the valve core body (113), and the end face of the valve core body (113) close to the valve core mounting end (114) is a first step (115); The end of the valve core assembly (1) close to the valve core mounting end (114) is provided with a limiting structure, the limiting structure cooperates with the first step (115) to form an annular sealing groove, and the sealing structure (13) is sealed in the annular sealing groove; or When one end of the spring sleeve (12) extends into the valve core (11) from the first opening, the folded end (121) is folded onto the inner wall of the valve core (11), and the folded end (121) is fixedly connected with the inner wall of the valve core (11) by riveting.

3. The electronic expansion valve spool assembly of claim 2, wherein, The limiting structure is a boss (125), the boss (125) is fixedly arranged on the circumferential surface of the spring sleeve (12), and when the spring sleeve (12) is fixedly connected with the valve core (11), the boss (125) abuts against one end of the valve core (11).

4. The electronic expansion valve spool assembly of claim 2, wherein, The limiting structure is a limiting plate (16), the spring sleeve (12) is provided with a second step (126) close to the valve core (11), the limiting plate (16) is limited between the end of the valve core (11) and the second step (126), and the sealing structure (13) is sealed between the first step (115) and the limiting plate (16).

5. The electronic expansion valve spool assembly of claim 1, wherein, The surface of the spring sleeve (12) is fixedly provided with a boss (125) in the circumferential direction, the boss (125), the surface of the spring sleeve and the end face of the valve core cooperate to form an annular sealing groove, and the sealing structure (13) is sealed in the annular sealing groove.

6. The electronic expansion valve spool assembly of claim 1, wherein, The spring sleeve (12) is provided with a hollow cavity (122) therein, and the spring sleeve (12) is provided with a first spring sleeve opening and a second spring sleeve opening (124) at the end along the axial direction, the first spring sleeve opening and the second spring sleeve opening (124) are communicated with the hollow cavity (122), the spring (14) is accommodated in the hollow cavity (122), and one end of the valve rod (15) extends into the hollow cavity (122) from the first spring sleeve opening and abuts against one end of the spring (14).

7. The electronic expansion valve spool assembly of claim 6, wherein, The valve rod (15) is provided with a valve rod folded end (151) at the end close to the spring sleeve (12). The hollow cavity (122) of the spring sleeve (12) is further provided with a sliding member (128), the sliding member (128) can slide in the hollow cavity (122) along the axial direction of the spring sleeve (12), and the sliding member (128) is provided with a through hole. After the valve rod (15) passes through the through hole, the valve rod folded end (151) of the valve rod (15) is folded on the surface of the sliding member (128), and the valve rod folded end (151) of the valve rod (15) is welded and fixed on the sliding member (128).

8. Electronic expansion valve spool assembly according to claim 6 or 7, characterized in that The sealing structure (13) is a ring-shaped sealing member or a ring-shaped sealing assembly, and the outer diameter of the sealing structure (13) is greater than the outer diameter of the valve core (11); or The surface of the spring sleeve (12) is provided with a communication hole (127) communicated with the hollow cavity (122).

9. An electronic expansion valve characterized by The valve seat assembly (2), the transmission assembly (3) and the valve core assembly (1) as claimed in any one of claims 1-8 are comprised. The transmission assembly (3) is installed on the valve seat assembly (2), and the valve core assembly (1) is accommodated in the valve seat assembly (2) and the transmission assembly (3). The valve seat assembly (2) is provided with an installation cavity (21) and a flow-through cavity (22) therein, the installation cavity (21) and the flow-through cavity (22) are communicated, the surface of the valve seat assembly (2) is provided with an installation opening, a flow passage inlet (24) and a flow passage outlet (25), the installation opening is communicated with the installation cavity (21), the installation opening is provided on the side of the installation cavity (21) close to the valve rod, the flow passage inlet (24) and the flow passage outlet (25) are communicated with the flow-through cavity (22), the installation opening and the flow passage outlet (25) are arranged at opposite ends of the valve seat assembly (2), the valve core (11) and the spring sleeve (12) are accommodated in the valve seat assembly (2), there is a gap between the valve core (11) and the inner wall of the installation cavity (21), and the sealing structure (13) is in interference fit with the inner wall of the installation cavity (21). The transmission assembly (3) comprises a transmission component (31) and a housing (32), the transmission component (31) is installed in the housing (32), the other end of the valve rod (15) extends into the housing (32) of the transmission assembly (3) from the installation opening, the transmission component (31) can drive the valve rod (15) to move towards the direction away from or close to the flow passage outlet (25), under the driving of the valve rod (15), the valve core (11) moves to the flow passage outlet (25) to seal the flow passage outlet (25) or moves away from the flow passage outlet (25) to make the flow passage outlet (25) communicated with the flow-through cavity (22).

10. The electronic expansion valve according to claim 9, characterized in that The spring sleeve (12) is provided with a communication hole (127) on the surface, and the hollow cavity (122) and the installation cavity (21) are communicated through the communication hole (127); If the valve core (11) is moved to be sealed on the flow channel outlet (25), the installation cavity (21) and the flow channel outlet (25) are communicated through the valve core (11) and the spring sleeve (12).

11. The electronic expansion valve according to claim 9, wherein The valve seat assembly (2) comprises an upper valve seat (26) and a lower valve seat (27), and the lower valve seat (27) is sealingly installed on the upper valve seat (26); The installation cavity (21), the flow-through cavity (22), the installation port and the flow channel inlet (24) are all arranged on the upper valve seat (26), and the flow channel outlet (25) is arranged on the lower valve seat (27); The lower valve seat (27) is provided with a valve seat step (271) at one end close to the upper valve seat (26), and the valve seat step (271) is fixedly provided with an annular sealing gasket (272), and when the valve core (11) seals the flow channel outlet (25), the valve core (11) abuts on the annular sealing gasket (272), so that the flow channel outlet (25) is not communicated with the flow-through cavity (22).

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