Valve element assembly, electronic expansion valve and refrigeration equipment

Abstract

The utility model discloses a valve core assembly, an electronic expansion valve and refrigeration equipment, the valve core assembly comprises a valve needle, a valve rod and a driving lantern ring, and the valve needle is provided with a containing cavity; a connecting section and a guiding section are sequentially arranged at the tail end of the valve rod in the axial direction, and the outer diameter of the guiding section is smaller than that of the connecting section; the driving lantern ring is located in the containing cavity, the tail end of the valve rod penetrates through the driving lantern ring, the guide section is in clearance fit with the driving lantern ring, the connecting section is fixedly connected with the driving lantern ring, and the valve rod drives the valve needle to move up and down in the axial direction through the driving lantern ring. And the valve port of the electronic expansion valve can be communicated with or separated from the outside. According to the technical scheme, machining procedures can be reduced, machining manufacturability can be improved, machining precision is improved, and machining cost is reduced.

Description

Technical Field

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

[0002] Common electronic expansion valves are generally driven by a stepper motor, and the combined action of the stator and the rotor drives the valve stem to rotate, and the valve stem nut mechanism converts the rotation of the valve stem into axial movement of the valve stem. In related technologies, the valve stem and the valve needle are connected by a drive ring, and the up and down movement of the valve stem drives the drive ring and then drives the valve needle to move up and down, thereby realizing the opening and closing of the valve port. For the convenience of connection, a guide structure is provided in the drive ring, but there are problems of cumbersome procedures and high processing costs. Utility Model Content

[0003] The main purpose of the utility model is to provide a valve stem assembly, wherein a transition section and a connecting section are provided on the valve stem, such a design can reduce the processing steps, is conducive to improving the processing technology, increasing the processing accuracy and reducing the processing cost.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a valve core assembly, which is applied to an electronic expansion valve. The valve core assembly includes:

[0005] A valve needle, wherein the valve needle has a receiving cavity;

[0006] A valve stem, wherein a connecting section and a guiding section are sequentially arranged at the end of the valve stem in the axial direction, and the outer diameter of the guiding section is smaller than the outer diameter of the connecting section; and

[0007] A driving collar, wherein the driving collar is located in the accommodating cavity, the driving collar is passed through the end of the valve stem, the guide section and the driving collar are clearance-fitted, the connecting section and the driving collar are fixedly connected, and the valve stem drives the valve needle to move up and down along the axial direction through the driving collar, thereby enabling the valve port of the electronic expansion valve to be connected to or isolated from the outside.

[0008] Optionally, the valve stem further includes a first transition section, the first transition section is connected to the guide section, and the first transition section is close to an end surface of the end.

[0009] Optionally, the valve stem further includes a second transition section, and the first transition section, the guide section, the second transition section and the connecting section are connected in sequence, and the outer diameters thereof increase in sequence.

[0010] Optionally, the contour line formed by connecting the first transition section, the guide section, the second transition section and the connecting section is a broken line or a curve; or, the cross-section of the valve stem is circular, elliptical or polygonal.

[0011] Optionally, the total axial length of the end of the valve stem is M, the axial length of the guide section is m1, the axial length of the connecting section is m2, and the total length of the first transition section and the second transition section is m3, then m1+m2+m3=M, and m3≠0, and 1 / 3m≤m1<1 / 2m; and / or, 1 / 2m≤m2<2 / 3m.

[0012] Optionally, the diameter of the portion where the end cooperates with the drive collar is smaller than the diameter of the remaining portion of the valve stem, and a positioning step is formed on the valve stem, and the drive collar abuts against the positioning step.

[0013] Optionally, the connecting section and the driving collar are interference-connected, welded, or expanded.

[0014] Optionally, the valve core assembly further includes a bearing, an outer ring of the bearing is fixed to the accommodating cavity, the valve stem passes through the inner ring of the bearing, and when the valve stem moves upward, the drive ring abuts against the bearing.

[0015] The utility model also provides an electronic expansion valve, comprising

[0016] A nut, wherein the nut is provided with a mounting hole;

[0017] As for the valve core assembly as described above, the valve stem of the valve core assembly is passed through the mounting hole and is threadedly connected to the nut.

[0018] The utility model also provides a refrigeration device, comprising the electronic expansion valve mentioned above.

[0019] The technical solution of the utility model drives the driving ring to move upward when the valve stem moves upward, and the driving ring drives the valve needle to move upward to open the valve port. In the related art, the valve stem is a hollow stem of equal diameter, and a guide section and a connecting section are designed inside the driving ring, and the valve stem is inserted into the driving ring. The present application is opposite to this structure, and the guide section and the connecting section are designed on the valve stem, and the inside of the driving ring is a light hole structure. Such a design can reduce the processing steps, which is conducive to improving the processing technology, improving the processing accuracy, and reducing the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1This is a structural schematic diagram of an embodiment of the electronic expansion valve of the utility model;

[0022] Figure 2 for Figure 1 A partial enlarged view of the middle valve core assembly;

[0023] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0024] Figure 4 for Figure 2 A partial enlarged view of point A in the middle.

[0025] Description of Figure Numbers:

[0026]

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] Common electronic expansion valves are generally driven by a stepper motor, and the combined action of the stator and the rotor drives the valve stem to rotate, and the valve stem nut mechanism converts the rotation of the valve stem into axial movement of the valve stem. In related technologies, the valve stem and the valve needle are connected by a drive ring, and the up and down movement of the valve stem drives the drive ring and then drives the valve needle to move up and down, thereby realizing the opening and closing of the valve port. For the convenience of connection, a guide structure is provided in the drive ring, but there are problems of cumbersome processing procedures and high processing costs.

[0032] To this end, the utility model proposes an electronic expansion valve.

[0033] Reference Figure 1 The utility model proposes an electronic expansion valve including a housing 101, a stator module and a rotor module 140 located in the housing 101, a valve core assembly including a valve stem 400 and a driving collar 310, the valve stem 400 passes through the rotor module 140, the valve stem 400 is connected to the housing 101 through a limit plate 102 and a partition plate, and can rotate relatively, a nut 130 is fixedly connected to a valve seat 103, and the rotor module 140 drives the valve core assembly to move to control the flow size of the electronic expansion valve.

[0034] In the electronic expansion valve, the nut 130 is provided with a mounting hole 131 extending along its axial direction, the valve core assembly is inserted into the mounting hole 131, and the valve stem 400 is threadedly connected to the nut 130. Specifically, the valve stem 400 is provided with a threaded rod section at one end away from the first opening end, the mounting hole 131 includes a threaded hole 132 adapted to the threaded rod section, and the threaded rod section cooperates with the threaded hole 132. The valve seat 103 is provided with a valve port 105 corresponding to the valve needle 200, and the valve needle 200 can be detachably installed in the valve port 105. In this way, the rotor module 140 drives the valve stem 400 to rotate, and through the cooperation with the threaded rod section and the threaded hole 132, the valve stem 400 can synchronously perform circumferential rotation and axial movement, and the valve stem 400 then drives the valve needle 200 to move axially upward or axially downward, thereby controlling the flow rate of the electronic expansion valve.

[0035] Specifically, the valve needle 200 is separated from the valve port 105 of the valve seat 103 , and the fluid can flow from the first connecting pipe 110 into the valve seat 103 and from the valve port 105 of the valve seat 103 into the second connecting pipe 120 . After the valve stem 400 rotates in the opposite direction, the valve needle 200 will seal the valve port 105 under the action of the spring 330 .

[0036] Combined with reference Figure 2Specifically, the valve core assembly includes a valve needle 200, a bearing 320 and a valve stem 400, the valve needle 200 has a first end 201 and a second end 202 relative to each other, the first end 201 is used to be detachably installed on the valve port 105 of the electronic expansion valve, the bearing 320 is fixedly installed on the second end 202 through an outer ring, and the valve stem 400 is inserted into the inner ring of the bearing 320.

[0037] In the related art, the valve stem 400 and the valve needle 200 are connected via a drive ring 310. The up and down movement of the valve stem 400 drives the drive ring 310 and then drives the valve needle 200 to move up and down. The drive ring 310 can be integrally arranged with the valve needle 200 or can be separately arranged. For the convenience of connection, the inner hole of the drive ring 310 is usually provided with an internal thread, and the valve stem 400 is provided with an external thread.

[0038] Reference Figures 2 to 4 , the structure of the valve core assembly will be introduced below.

[0039] like Figure 2 As shown, in one embodiment of the utility model, the valve core assembly includes:

[0040] A valve needle 200, wherein the valve needle 200 has a receiving cavity 210;

[0041] Valve stem 400, reference Figure 3 The end 401 of the valve stem 400 is provided with a connecting section 430 and a guiding section 420 in sequence along the axial direction, and the outer diameter of the guiding section 420 is smaller than the outer diameter of the connecting section 430;

[0042] Reference Figure 1 and Figure 2 , a driving ring 310, the driving ring 310 is located in the accommodating chamber 210, the end 401 of the valve stem 400 is penetrated by the driving ring 310, the guide section 420 and the driving ring 310 are clearance-fitted, the connecting section 430 and the driving ring 310 are fixedly connected, the valve stem 400 drives the valve needle 200 to move up and down along the axial direction through the driving ring 310, and the valve port 105 of the electronic expansion valve can be connected to or isolated from the outside.

[0043] The technical solution of the utility model drives the driving collar 310 to move upward when the valve stem 400 moves upward, and the driving collar 310 drives the valve needle 200 to move upward, thereby realizing the opening of the valve port 105. In the related art, the valve stem 400 is a hollow stem of equal diameter, and a guide section 420 and a connecting section 430 are designed inside the driving collar 310, and the valve stem 400 is inserted into the driving collar 310. In contrast to this structure, the present application designs the guide section 420 and the connecting section 430 on the valve stem 400, and the inside of the driving collar 310 is a light hole structure. Such a design can reduce the processing steps, which is conducive to improving the processing technology, improving the processing accuracy, and reducing the processing cost.

[0044] like Figure 2 As shown, specifically, the valve core assembly further comprises a driving collar 310 fixedly sleeved on the end 401 of the valve needle 200, the driving collar 310 is located on the side of the bearing 320 close to the first end 201 of the valve needle 200, and can be detachably pressed against the end face of the bearing 320. In this way, when the valve stem 400 moves axially upward, since the limiting collar abuts against the end face of the bearing 320, the limiting collar is driven by the bearing 320 to move axially upward, and the bearing 320 will also move upward under the thrust, and the valve needle 200 fixedly connected to the bearing 320 will also move upward accordingly. Of course, in other embodiments, the peripheral edge of the end 401 of the valve stem 400 may also be provided with a driving convex portion, so that when the valve stem 400 moves axially upward, the driving convex portion abuts against the end face of the bearing 320, and the valve needle 200 can also be driven to move upward.

[0045] It should be noted that the bearing 320 may also be a structure of the valve needle 200 itself, such as a ring nested in the accommodating cavity 210 of the valve needle 200 .

[0046] In the valve core assembly of the present invention, when the valve stem 400 drives the valve needle 200 to move axially, the valve stem 400 will also rotate circumferentially. However, since the valve stem 400 is inserted into the inner ring of the bearing 320, and the outer ring of the bearing 320 is fixedly connected to the valve needle 200, even if the inner ring of the bearing 320 is driven to rotate with the valve stem 400, the outer ring of the bearing 320 fixedly connected to the valve needle 200 can remain stationary in the circumferential direction, and the valve needle 200 will not be driven to rotate circumferentially. In the present invention, by making the valve stem 400 and the bearing 320 cooperate, the circumferential movement transmitted by the valve stem 400 to the valve needle 200 is offset, so that the valve needle 200 only receives the axial movement transmitted by the valve stem 400, and will not rotate relative to the valve port 105, which is conducive to reducing the wear between the valve needle 200 and the valve port 105, thereby ensuring the working reliability of the electronic expansion valve. In addition, the valve core assembly of the present invention has the advantages of few parts while having extremely high reliability. During production, there are few assembly processes and low manufacturing costs.

[0047] Please refer to 2 and Figure 3 , the diameter of the portion where the end 401 matches the drive collar 310 is smaller than the diameter of the rest of the valve stem 400, and a positioning step 440 is formed on the valve stem 400, and the drive collar 310 abuts against the positioning step 440. The end 401 of the valve needle 200 is provided with a positioning step 440, and the drive collar 310 abuts against the positioning step 440. In this way, in the process of installing the drive collar 310 on the valve needle 200, the positioning step 440 can play a positioning role, and when the end face of the drive collar 310 abuts against the positioning step 440, it means that the drive collar 310 is installed in place. Of course, in other embodiments, it is also possible that a positioning step 440 is provided on the inner side of the drive collar 310, and when the end 401 of the valve stem 400 abuts against the positioning step 440, it means that the drive collar 310 is installed in place.

[0048] The driving collar 310 is adjacent to the positioning step 440 of the valve stem 400 , and the transition section 410 is adjacent to the positioning step 440 .

[0049] Reference Figure 3 Specifically, the valve stem 400 also includes a first transition section 411, which is connected to the guide section 420, and the first transition section 411 is close to the end surface of the end 401. The valve stem 400 also includes a second transition section 412, and the first transition section 411, the guide section 420, the second transition section 412 and the connecting section 430 are connected in sequence, and the outer diameters increase in sequence.

[0050] The driving collar 310 is clearance-fitted with the first transition section 411 , the guide section 420 , and the second transition section 412 of the valve stem 400 , and the driving collar 310 is interference-fitted with the connecting section 430 .

[0051] The driving collar 310 and the connecting section 430 are fixedly connected by expansion joint or welding. The outer diameter of the connecting section 430 gradually decreases from the connecting section 430 to the end surface of the terminal 401, that is, the outer diameter of the second transition section 412 is greater than the outer diameter of the first transition section 411.

[0052] Specifically, the first transition section 411 , the guide section 420 , the second transition section 412 and the connecting section 430 are connected in sequence, and the outer diameters increase in sequence, and the first transition section 411 is close to the end surface of the terminal 401 .

[0053] Specifically, the contour line formed by connecting the first transition section 411, the guide section 420, the second transition section 412 and the connecting section 430 is a broken line or a curve; or, the cross-section of the valve stem 400 is circular, elliptical or polygonal.

[0054] The driving collar 310 is an axial hole with a constant outer diameter in the axial direction, and the connecting section 430 of the valve stem 400 is interference fit with the driving collar 310, and the first transition section 411, the guide section 420, the second transition section 412 and the connecting section 430 are sequentially connected, and the outer diameters are sequentially increased, and the first transition section 411 is close to the end 401. The outer diameter of the guide section 420 gradually decreases from the end close to the connecting section 430 to the end away from the connecting section 430. In this way, the guide section 420 can play a guiding role in the assembly process of the valve stem 400 and the driving collar 310, so that the operation of inserting the valve stem 400 into the driving collar 310 can be more labor-saving and faster.

[0055] The first transition section 411, the guide section 420, the second transition section 412 and the connecting section 430 are connected in sequence, and the outer diameters increase in sequence. The first transition section 411 is close to the end 401. Compared with making corresponding designs in the inner hole of the driving ring 310, the design of this scheme can reduce the processing steps, which is conducive to improving the processing technology, improving the processing accuracy and reducing the processing cost.

[0056] The transition section 410 and the driving collar 310 are clearance-fitted. When assembling the drive collar 310, the end 401 of the valve stem 400 is inserted from the end of the drive collar 310 close to the bearing 320. As a result, the guide section 420 of the valve stem 400 will first contact the drive collar 310. The outer diameter of the transition section 410 is smaller than the inner diameter of the drive collar 310, which can facilitate the end of the valve stem 400 to be aligned and inserted. Under the guidance of the guide section 420, the transition section 410 of the valve stem 400 can be inserted into the drive collar 310 with relatively little effort, and then pass through the transition section 410 to reach the second transition section 412, so that the connecting section 430 is fixedly connected to the drive collar 310. Since the outer diameters of the connecting section 430 and the drive collar 310 are interference fit, it is necessary to increase the force after the connecting section 430 enters the drive collar 310 to allow the valve stem 400 to continue to be inserted into the drive collar 310 until the drive collar 310 abuts against the positioning step 440. In this way, the assembly of the driving collar 310 and the valve stem 400 can be achieved more labor-saving and faster, which is conducive to improving the production efficiency of the electronic expansion valve.

[0057] The fixed connection includes but is not limited to interference connection, welding, or expansion connection.

[0058] It should be noted that no matter what line type the inner wall contour line of the drive collar 310 and the outer circle contour line of the valve stem 400 are, including but not limited to broken lines and curves, as long as the type of fit between the valve stem 400 and the drive collar 310 starts from the end 401 away from the valve stem 400 and transitions from a clearance fit to a fixed connection, they are all within the protection scope of this solution.

[0059] Further, refer to Figure 4 , the total axial length of the end 401 of the valve stem 400 is M, the axial length of the guide section 420 is m1, the axial length of the connecting section 430 is m2, and the total length of the first transition section 411 and the second transition section 412 is m3, then m1+m2+m3=M, and m3≠0, and 1 / 3m≤m1<1 / 2m; and / or, 1 / 2m≤m2<2 / 3m, wherein the units of M, m1, m2, and m3 are mm.

[0060] Assuming that the common part of the matching section of the drive collar 310 and the valve stem 400 has an axial length of M along the valve stem 400, the matching part of the drive collar 310 and the guide section 420 of the valve stem 400 has an axial length of m1 along the valve stem 400, the matching part of the drive collar 310 and the connecting section 430 of the valve stem 400 has an axial length of m2 along the valve stem 400, and the total axial length of the matching part of the drive collar 310 and the transition section 410 of the valve stem 400 along the valve stem 400 is m3, then m1+m2+m3=M. In order to ensure that the valve stem 400 and the drive collar 310 have a good matching effect, 1 / 3M≤m1<1 / 2M, 1 / 2M≤m2<2 / 3M and m3≠0 must be satisfied at the same time.

[0061] Specifically, the valve core assembly further includes an elastic member, one end of which is connected to the valve stem 400, and the other end of which is connected to the bearing 320, and the valve stem 400 is movably inserted in the inner ring of the bearing 320. Specifically, the end of the elastic member is connected to the end surface of the inner ring of the bearing 320 away from the first end 201, and the valve stem 400 drives the valve needle 200 to move axially through the elastic member, and the valve stem 400 can at least move axially relative to the bearing 320, so that when the valve needle 200 abuts against the valve port 105, the valve stem 400 can continue to move downward relative to the valve needle 200, thereby compressing the elastic member, so that the elastic member can provide a pre-tightening force for the valve needle 200, and the valve needle 200 can stably abut against the valve port 105. Of course, in other embodiments, the valve stem 400 can also be fixedly inserted in the inner ring of the bearing 320, so that the valve stem 400 can drive the valve needle 200 to move axially through the bearing 320.

[0062] Optionally, the end of the elastic member is connected to the end surface of the inner ring of the valve stem 400 and the bearing 320 by abutting or embedding. The end of the elastic member may directly abut the end surface of the inner ring of the valve stem 400 or the bearing 320, or may indirectly abut the end surface of the inner ring of the valve stem 400 or the bearing 320 through other parts. Without loss of generality, as Figure 2 As shown, in one embodiment, the elastic member is configured as a compression spring 330, and the peripheral wall of the valve stem 400 is provided with a flange portion. The compression spring 330 is sleeved on the valve stem 400, and one end of the compression spring abuts against the flange portion, and the other end abuts against the end surface of the inner ring of the bearing 320, so as to respectively realize the connection with the valve stem 400 and the end surface of the bearing 320. Of course, in other embodiments, the elastic member can also be configured as a spring sheet, an elastic rubber sleeve, or an elastic silicone sleeve.

[0063] Furthermore, the second end 202 is open in a direction away from the first end 201, and a receiving cavity 210 is formed inside the valve needle 200, and the bearing 320 is fixedly installed in the receiving cavity 210 through the outer ring. In this way, the bearing 320 will not be exposed, and the matching structure of the bearing 320 and the receiving cavity 210 will also be accommodated in the receiving cavity 210, and will not be easily impacted, which is conducive to ensuring the stable connection between the bearing 320 and the receiving cavity 210. Of course, in other embodiments, the end face of the second end 202 can also be a planar structure, and the bearing 320 is fixedly installed on the end face of the second end 202. In this case, a gap can be left between the inner ring of the bearing 320 and the end face of the second end 202, so that the inner ring of the bearing 320 can be driven to rotate relative to the connecting portion, and the valve needle 200 can also be prevented from circumferential rotation.

[0064] Furthermore, if Figure 2 As shown, the bearing 320 is fixed in the accommodating cavity 210 by riveting. Specifically, the groove wall of the first groove section includes a main body and a riveting part, and the riveting part is connected to the groove wall of the second groove section through the main body, that is, the riveting part is the end 401 of the groove wall of the first groove section. After the bearing 320 is installed on the limiting step, the outer ring of the bearing 320 abuts against the groove wall surface of the first groove section, and the outer ring of the bearing 320 can be limited in the circumferential direction, thereby further improving the installation stability of the bearing 320. Then, by bending the riveting part so that the riveting part abuts against the end face of the outer ring of the bearing 320, the bearing 320 can be riveted and fixed to the accommodating cavity 210. Among them, the groove wall thickness of the riveting part is less than the groove wall thickness of the main body, and the riveting part can be bent more labor-savingly, and the riveting processing of the bearing 320 can be realized more conveniently and quickly. Thus, the riveting portion and the limiting step limit the bearing 320 on both sides of the axial direction, and the groove wall of the first groove section limits the bearing 320 in the circumferential direction, so that the bearing 320 can be stably fixedly installed in the accommodating cavity 210.

[0065] like Figure 1 As shown, in the electronic expansion valve of the present invention, a guide collar 500 is further installed in the valve cavity 104, and the guide collar 500 is located on the side of the nut 130 close to the valve port 105; the valve needle 200 is inserted into the valve port 105 after passing through the guide collar 500, and under the drive of the valve stem 400, the valve needle 200 moves axially relative to the valve port 105 under the guidance of the guide collar 500, thereby opening or closing the valve port 105. It can be understood that the guide collar 500 is coaxially arranged with the valve port 105. On the one hand, the coaxiality of the valve needle 200 and the valve port 105 can be improved by limiting the valve needle 200 with the guide collar 500; on the other hand, when the valve stem 400 drives the valve needle 200 to move, the guide collar 500 can guide the axial movement of the valve needle 200 to ensure the smooth movement of the valve needle 200. In this way, the valve needle 200 can maintain a high degree of coaxiality with the valve port 105 in both the static state and the moving state, which is conducive to ensuring the accuracy of the opening control of the valve port 105, thereby ensuring the working reliability of the electronic expansion valve. Moreover, under the guidance of the guide ring 500, the valve needle 200 will not move unnecessarily relative to the valve port 105, thereby reducing the wear between the valve needle 200 and the valve port 105, which is conducive to extending the service life of the valve core assembly, so as to further ensure the working reliability of the electronic expansion valve.

[0066] Further reference Figure 1 and Figure 2 The valve needle 200 includes a needle body and a connecting part connected to each other. The needle body is inserted into the valve port 105 after passing through the guide collar 500, and the connecting part has a portion located in the inner cavity of the nut 130. Specifically, the nut 130 is provided with a first guide hole, the connecting part is inserted into the first guide hole, and has a portion located in the inner cavity of the nut 130. The nut 130 provides guidance for the axial movement of the connecting part through the first guide hole; the guide collar 500 is provided with a second guide hole for the needle body to pass through, thereby guiding its axial movement. It can be understood that the first guide hole and the second guide hole are both coaxial with the valve port 105. Due to the dual limiting and guiding functions of the first guide hole of the nut 130 and the second guide hole of the guide collar 500, the valve needle 200 and the valve port 105 have a high coaxiality, which is conducive to ensuring the accuracy of the opening control of the valve port 105, thereby ensuring the working reliability of the electronic expansion valve. In particular, the hole depth of the second guide hole is greater than or equal to 1 mm to meet the maximum axial movement of the needle body, so that the second guide hole can provide a guiding function during the axial movement of the needle body. In addition, optionally, the needle body and the connecting portion can be integrally formed to improve the production and processing efficiency of the valve needle 200; or, the needle body and the connecting portion are independently formed and then fixedly connected to simplify the structure of the mold and ensure the yield of the finished product.

[0067] Furthermore, the guide collar 500 is also provided with a first clearance hole that is axially distributed and connected to the second guide hole, and the end of the connecting portion connected to the needle body protrudes from the inner cavity of the nut 130 and is accommodated in the first clearance hole. Furthermore, a second clearance hole is also provided in the guide collar 500, and the second clearance hole is connected to the end of the first clearance hole away from the second guide hole, and the nut 130 is partially accommodated in the second clearance hole. It can be understood that the second guide hole of the guide collar 500 needs to be guided by the valve needle 200, and the valve needle 200 is located close to the valve port 105. If the guide collar 500 is connected to the valve housing 101 through the outer wall of the second guide hole, it is easy to affect the flow of the refrigerant near the valve port 105. In this embodiment, a first evacuation hole for evading the connection part and a second evacuation hole for evading the nut 130 are sequentially arranged on the side of the second guide hole away from the valve port 105. Thus, the guide ring 500 is fixedly connected to the valve housing 101 through the outer wall of the first evacuation hole or the outer wall of the second evacuation hole, that is, the connection structure between the guide ring 500 and the valve housing 101 has an adverse effect on the flow of the refrigerant.

[0068] Furthermore, a refrigerant port is provided on the side wall of the valve housing 101, and the guide collar 500 is provided with a guide cone surface relative to the refrigerant port. Thus, when the refrigerant flows between the refrigerant port and the valve port 105, the guide cone surface can guide the refrigerant flow, thereby preventing the refrigerant flow from being chaotic and affecting the working performance of the electronic expansion valve.

[0069] Furthermore, the valve cavity 104 includes a first valve cavity 104 and a second valve cavity 104 respectively located on both axial sides of the guide collar 500, and a balancing channel for connecting the first valve cavity 104 and the second valve cavity 104 is provided on the guide collar 500 or the valve housing 101. Due to the provision of the balancing channel, the air pressures of the first valve cavity 104 and the second valve cavity 104 can be balanced, which is conducive to ensuring the stability of the internal pressure of the electronic expansion valve, and can reduce the movement resistance of the valve needle 200, thereby ensuring the working performance of the electronic expansion valve.

[0070] When a foreign object is stuck between the valve port 105 and the valve needle 200, even if the tip of the needle body is deflected, since the fitting clearance between the main section of the needle body and the second guide hole is larger than the minimum fitting clearance between the tip and the inner wall surface of the valve port 105, there is sufficient room for movement between the main section and the inner wall surface of the second guide hole. The main section is driven to tilt relative to the second guide hole, but it will not be stuck with the second guide hole, but will still maintain a certain gap with the inner wall surface of the second guide hole, which will not affect the up and down movement of the needle body. Moreover, since the gap between the outer wall surface of the connecting part and the inner wall surface of the nut 130 is larger than the minimum fitting clearance between the tip and the inner wall surface of the valve port 105, there is also sufficient room for movement between the connecting part and the first guide hole of the nut 130. Similarly, after the connecting part is driven to tilt relative to the inner wall surface of the first guide hole, it will not be stuck with the first guide hole, but will still maintain a certain gap with the inner wall surface of the first guide hole. In this way, the overall up and down movement of the valve needle 200 will not be affected. In summary, when foreign matter is stuck between the tip of the valve needle 200 and the valve port 105, since the main section of the valve needle 200 in the inner cavity of the guide ring 500 and the connecting part in the inner cavity of the nut 130 have sufficient deviation space, the valve needle 200 can still move smoothly in the up and down directions, thereby effectively avoiding the valve needle 200 from getting stuck and at the same time avoiding the influence of eccentricity caused by coaxial deviation during the assembly of the valve core assembly on the valve needle 200.

[0071] The matching clearance between the connecting part and the nut 130 is larger than the matching clearance between the needle body and the guide collar 500, that is, the clearance D between the outer wall surface of the connecting part and the inner wall surface of the first guide hole is larger than the clearance D between the outer wall surface of the main section and the inner wall surface of the second guide hole. It can be understood that when the valve port 105 is opened, the tip of the needle body is separated from the valve port 105. At this time, if a foreign object is stuck in the clearance between the main section and the second guide hole, even if the main section is tilted relative to the second guide hole, and the connecting part is driven to tilt relative to the first guide hole, the connecting part will not be stuck with the first guide hole, but will still maintain a certain clearance with the inner wall surface of the first guide hole, so that the overall up and down movement of the valve needle 200 will not be affected.

[0072] The mounting hole 131 also includes a threaded hole 132, which is located on the side of the first guide hole away from the valve port 105. One end of the valve stem 400 is driven and connected to the connection portion, and the other end of the valve stem 400 is threadedly connected to the threaded hole 132. In this way, the coil drives the magnetic rotor to rotate, and the magnetic rotor drives the valve stem 400 to rotate. Through the threaded cooperation with the nut 130, the valve stem 400 can synchronously perform circumferential rotation and axial movement, and the valve stem 400 then drives the valve needle 200 to move axially upward or axially downward, thereby controlling the flow rate of the electronic expansion valve. The threaded section of the valve stem 400 and the threaded hole 132 are in clearance cooperation, so that the valve stem 400 can have a certain movement deviation in the radial direction relative to the nut 130, so that the valve stem 400 and the nut 130 can further absorb the concentric deviation to improve the overall coaxiality.

[0073] The utility model also provides a refrigeration device, which includes an electronic expansion valve. The specific structure of the electronic expansion valve refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the electronic expansion valve can be applied to refrigeration equipment, including but not limited to household air conditioners, car air conditioners, refrigerators, etc.

[0074] Specifically, the electronic expansion valve adjusts the valve opening in real time through the controller, thereby achieving precise control of the fluid flow. This control method has the characteristics of fast response speed and high precision, and can meet the needs of various complex working conditions. Compared with traditional mechanical expansion valves, electronic expansion valves have higher control accuracy and more stable performance, which is conducive to improving the operating efficiency and reliability of the entire system.

[0075] In refrigeration equipment, electronic expansion valves are mainly used to adjust the flow of refrigerant to ensure the stability of the refrigeration effect. By accurately controlling the flow of refrigerant, electronic expansion valves can effectively improve the energy efficiency of the refrigeration system and reduce energy consumption, thereby achieving the goal of energy conservation and emission reduction.

[0076] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the concept of the utility model, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A valve core assembly, applied to an electronic expansion valve, characterized in that: The valve core assembly comprises: A valve needle, wherein the valve needle has a receiving cavity; A valve stem, wherein a connecting section and a guiding section are sequentially arranged at the end of the valve stem in the axial direction, and the outer diameter of the guiding section is smaller than the outer diameter of the connecting section; and A driving collar, wherein the driving collar is located in the accommodating cavity, the driving collar is passed through the end of the valve stem, the guide section and the driving collar are clearance-fitted, the connecting section and the driving collar are fixedly connected, and the valve stem drives the valve needle to move up and down along the axial direction through the driving collar, thereby enabling the valve port of the electronic expansion valve to be connected to or isolated from the outside.

2. The valve core assembly according to claim 1, characterized in that: The valve stem further comprises a first transition section, the first transition section is connected to the guide section, and the first transition section is close to the end surface of the terminal end.

3. The valve core assembly according to claim 2, characterized in that: The valve stem further includes a second transition section, and the first transition section, the guide section, the second transition section and the connecting section are connected in sequence, and the outer diameters thereof increase in sequence.

4. The valve core assembly according to claim 3, characterized in that: The contour line formed by connecting the first transition section, the guide section, the second transition section and the connecting section is a broken line or a curve; or the cross-section of the valve stem is circular, elliptical or polygonal.

5. The valve core assembly according to claim 3, characterized in that: The total axial length of the end of the valve stem is M, the axial length of the guide section is m1, the axial length of the connecting section is m2, and the total length of the first transition section and the second transition section is m3, then m1+m2+m3=M, and m3≠0, and 1 / 3m≤m1<1 / 2m; and / or, 1 / 2m≤m2<2 / 3m.

6. The valve core assembly according to claim 1, characterized in that: The diameter of the portion where the end matches the drive collar is smaller than the diameter of the remaining portion of the valve stem, and a positioning step is formed on the valve stem, and the drive collar abuts against the positioning step.

7. The valve core assembly according to claim 1, characterized in that: The connecting section and the driving sleeve are interference connected, welded, or expanded.

8. The valve core assembly according to claim 1, characterized in that: The valve core assembly also includes a bearing, an outer ring of the bearing is fixed to the accommodating cavity, the valve stem passes through the inner ring of the bearing, and when the valve stem moves upward, the driving ring abuts against the bearing.

9. An electronic expansion valve, characterized in that: include A nut, wherein the nut is provided with a mounting hole; According to the valve core assembly as described in any one of claims 1 to 8, the valve stem of the valve core assembly is penetrated through the mounting hole and is threadedly connected to the nut.

10. A refrigeration device, characterized in that: Comprising the electronic expansion valve as claimed in claim 9.

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