Electronic expansion valve and air conditioning system
By adopting end-face sealing method in the electronic expansion valve and using rubber valve mouth ring and pressure sleeve design, the problem of lax sealing caused by the deviation of the valve needle assembly and the valve mouth assembly is solved, better sealing performance and system stability are achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202422477026.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-12
AI Technical Summary
The existing electronic expansion valves have a coaxial deviation between the valve needle assembly and the valve port assembly, resulting in a lax seal and internal leakage, especially when the valve port diameter increases.
The end-face sealing method is adopted to achieve sealing by contacting the upper end surface of the valve needle at the abutment part of the valve needle. Combined with the design of the valve mouth ring and the pressure sleeve made of rubber material, the sealing performance is ensured and the influence of coaxial deviation is reduced.
Improves sealing performance, reduces internal leakage, makes the system more stable and reliable, extends service life, and reduces production costs.
Smart Images
Figure CN223153803U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic expansion valves, and particularly relates to an electronic expansion valve and an air conditioning system. Background Art
[0002] In a refrigeration system, an electronic expansion valve is used to regulate and control the refrigerant flow rate into an evaporator. With the progress of technology, electronic expansion valves are gradually applied to automotive air conditioning systems, heat pump air conditioning systems, and battery cooling systems. In the related art, the electronic expansion valve seals through line contact between the outer periphery of the valve needle and the inner wall of the valve port of the valve port assembly, and the valve needle assembly relies on the guidance of the valve port assembly during movement within the valve port assembly, resulting in a coaxiality deviation problem. Moreover, as the diameter of the valve port increases, it is likely to cause the valve needle assembly to be not tightly sealed with the valve port, resulting in internal leakage. Summary of the Utility Model
[0003] The main purpose of the utility model is to propose an electronic expansion valve and an air conditioning system, aiming to optimize the sealing between the valve needle assembly and the valve port assembly to end face sealing, so as to be not affected by the coaxiality of the valve needle assembly and improve the sealing performance.
[0004] To achieve the above object, an electronic expansion valve proposed by the utility model includes:
[0005] A first valve needle provided with an abutting portion; and
[0006] A valve port assembly provided with a valve port, the first valve needle being movably disposed within the valve port assembly and sealing the valve port by contact between the lower end face of the abutting portion and the upper end face of the valve port.
[0007] In an embodiment, the valve port assembly includes a connection seat, a valve port ring, and a compression sleeve. The connection seat includes a hollow inner cavity, the valve port ring is disposed within the inner cavity, the compression sleeve is connected to the connection seat and compresses the valve port ring, the valve port is disposed on the valve port ring, the diameter of the valve port is smaller than the inner diameter of the inner cavity, and the abutting portion contacts the edge surface of the valve port ring to seal the valve port.
[0008] In an embodiment, the abutting portion is annular, and an arc segment is provided on the lower end face of the abutting portion.
[0009] In an embodiment, the radius of the arc segment is 0.3 mm - 0.6 mm.
[0010] In an embodiment, the material of the valve port ring is rubber.
[0011] In an embodiment, the material of the valve port ring is carbon black reinforced rubber.
[0012] In one embodiment, the connecting seat is further provided with a first installation groove for installing the valve port ring and a second installation groove for installing the compression sleeve, and the first installation groove is smaller than the second installation groove.
[0013] In one embodiment, the range of the part of the valve port ring exceeding the first installation groove is from 0.03 mm to 0.10 mm.
[0014] In one embodiment, the compression sleeve is provided with a socket, the socket corresponds to the valve port, and the inner diameter of the socket is the same as the inner diameter of the valve port.
[0015] In one embodiment, the electronic expansion valve further includes a second valve needle, which is movably arranged in the first valve needle to open and close the flow path communicating the first valve needle with the valve port.
[0016] The present utility model also provides an air conditioning system, including the above-mentioned electronic expansion valve.
[0017] In the technical solution of the present utility model, the valve port part is installed on the connecting seat through the compression sleeve, so that the end surface of the first valve needle abuts against the end surface of the valve port part to seal the valve port of the connecting seat, enabling the first valve needle to stably contact the valve port part, thereby improving the problem that in the existing solution, the outer periphery of the first valve needle is in line contact sealing with the peripheral edge of the valve port, which may be affected by the coaxiality and result in imperfect sealing. The first valve needle and the valve port part achieve end surface sealing, which is not affected by the coaxiality of the first valve needle and has good sealing performance, making the system stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.
[0019] Figure 1 It is a schematic structural diagram of an embodiment of the electronic expansion valve provided by the present utility model;
[0020] Figure 2 For Figure 1 It is a schematic structural diagram of an embodiment of the connecting seat in
[0021] Figure 3 For Figure 1 It is a schematic structural diagram of an embodiment of the first valve needle in
[0022] Explanation of the reference numerals in the drawings:
[0023] 100. First valve needle; 110. Contact part;
[0024] 200. Valve port assembly; 201. Valve port;
[0025] 210. Connecting seat; 211. Inner cavity; 212. First installation groove; 213. Second installation groove;
[0026] 220. Valve port ring;
[0027] 230. Compression sleeve;
[0028] 300. Second valve needle.
[0029] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners
[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
[0031] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0033] In a refrigeration system, an electronic expansion valve is used to regulate and control the refrigerant flow rate into the evaporator. With the progress of technology, electronic expansion valves are gradually applied in automotive air conditioning systems, heat pump air conditioning systems, and battery cooling systems. In related technologies, the electronic expansion valve seals through line contact between the outer periphery of the valve needle and the inner wall line of the valve port of the valve port assembly. During the movement of the valve needle assembly within the valve port assembly, it relies on the guidance of the valve port assembly, resulting in a coaxiality deviation problem. Moreover, as the diameter of the valve port increases, it is prone to causing poor sealing between the valve needle assembly and the valve port, leading to internal leakage.
[0034] The main objective of the present utility model is to provide an electronic expansion valve, aiming to optimize the sealing between the valve needle assembly and the valve port assembly to end face sealing, thereby being unaffected by the coaxiality of the valve needle assembly.
[0035] In an embodiment of the present utility model, as Figures 1 to 3 shown, the electronic expansion valve includes a housing, a valve needle assembly disposed within the housing, and a valve port assembly 200 connected to the housing. The valve port assembly 200 includes a connection seat 210 connected to the housing, a compression sleeve 230 connected to the connection seat 210, and a valve port member 201 disposed between the connection seat 210 and the compression sleeve 230. The connection seat 210 is provided with a valve cavity and a valve port 201 communicating with the valve cavity. The valve needle assembly includes a first valve needle 100 movably disposed within the valve cavity. The first valve needle 100 can be driven by a rotor disposed within the housing to move axially along the valve cavity. When the end of the first valve needle 100 contacts the upper end face of the valve port member 201, the first valve needle 100 closes the flow path between the valve port 201 and the outside; conversely, when the first valve needle 100 disengages from the valve port member 201, the flow path between the valve port 201 and the outside is opened.
[0036] The first valve needle 100 is provided with an abutting portion 110; the first valve needle 100 is movably disposed within the valve port assembly 200 and seals the valve port 201 by contacting the upper end face of the valve port 201 with the lower end face of the abutting portion 110. An abutting portion 110 is added at the bottom of the first valve needle 100. This part of the design is used to form direct and stable contact with the upper end face of the valve port member 201, thereby achieving end face sealing. This design avoids the line contact sealing method in the traditional structure, significantly improves the sealing performance, and reduces the problem of poor sealing caused by coaxiality deviation. The abutting portion 110 can be made of a material with moderate hardness and good wear resistance, such as cemented carbide or specially treated metal, to ensure the stability and sealing performance during long-term use.
[0037] In the technical solution of the present utility model, the valve port 201 part is installed on the connecting seat 210 through the pressing sleeve 230, so that the end face of the first valve needle 100 abuts against the end face of the valve port 201 part to seal the valve port 201 of the connecting seat 210, enabling the first valve needle 100 to stably contact the valve port 201 part. Thus, it improves the problem that in the existing solution, the outer periphery of the first valve needle 100 is in line contact sealing with the peripheral edge of the valve port 201, which may be affected by coaxiality and result in poor sealing. The first valve needle 100 and the valve port 201 part achieve end face sealing, which is not affected by the coaxiality of the first valve needle 100, has good sealing performance, and the system is stable and reliable.
[0038] Referring to Figures 1 to 3 , the valve port assembly 200 includes a connecting seat 210, a valve port ring 220 and a pressing sleeve 230. The connecting seat 210 includes a hollow inner cavity 211. The valve port ring 220 is arranged in the inner cavity 211. The pressing sleeve 230 is connected to the connecting seat 210 and presses the valve port ring 220. The valve port 201 is arranged on the valve port ring 220. The diameter of the valve port 201 is smaller than the inner diameter of the inner cavity 211. The abutting portion 110 contacts the edge surface of the valve port ring 220 to seal the valve port 201.
[0039] By pressing the valve port ring 220 with the pressing sleeve 230, it ensures the tight fit between the valve port ring 220 and the connecting seat 210, thus avoiding leakage problems caused by loosening or gaps. The abutting portion 110 contacts the edge surface of the valve port ring 220 to form end face sealing. This sealing method is more reliable than traditional line contact sealing, reducing the problem of poor sealing caused by coaxiality deviation. The hollow inner cavity 211 of the connecting seat 210 provides a stable installation environment for the valve port ring 220. The addition of the pressing sleeve 230 further enhances the overall stability of the valve port assembly 200, reducing the loosening or damage of components caused by vibration or impact.
[0040] Specifically, the connecting seat 210 is provided with a first installation groove 212 for installing the valve port 201 part and a second installation groove 213 for installing the pressing sleeve 230. The first installation groove is larger than the second installation groove 213, forming a step. The valve port 201 part is annular, and the ring opening is smaller than the valve port 201, so that the outer peripheral end face of the first valve needle 100 can abut against the edge of the ring opening of the valve port 201 part, thereby sealing the ring opening. To ensure the sealing effect, the valve port 201 part is made of rubber material. Compared with the valve port 201 part made of plastic PTFE material, the sealing performance between the valve seat and the connecting seat 210 is poor, and it is necessary to add an O-ring made of rubber material to enhance the sealing performance, and the structure is complex. In this solution, the valve port 201 part made of rubber material is in an axially compressed state, and the sealing between the connecting seat 210 and the pressing sleeve 230 can be completely achieved.
[0041] Furthermore, to improve the sealing effect, the valve port 201 is made of carbon black-reinforced rubber. To improve cost performance, the mass of carbon black in the carbon black-reinforced rubber is 10%-30% of the total mass. For example, 10%, 12%, 15%, 18%, 20%, 25%, etc.
[0042] Referring to Figure 3 , the abutting portion 110 is annular, and an arc segment is provided on the lower end surface of the abutting portion 110. The design of the annular abutting portion 110 increases the contact area with the edge surface of the valve port ring 220, making the sealing more uniform and reliable. At the same time, the design of the arc segment can reduce the stress concentration on the contact surface and avoid sealing failure caused by excessive local pressure. Although the sealing between the abutting portion 110 and the valve port ring 220 mainly relies on end face contact, the design of the arc segment can, to a certain extent, adapt to the slight deviation of the coaxiality of the first valve needle 100 and ensure that the sealing effect is not affected. The larger contact area and the smoother contact surface make the sealing more tight, reduce the possibility of internal leakage, and improve the energy efficiency and stability of the system.
[0043] Specifically, the radius of the arc segment is 0.3 mm - 0.6 mm. Within this radius range, the arc segment can better adapt to the slight deviation of the coaxiality of the first valve needle 100. Due to errors in the manufacturing and installation processes, the coaxiality may not fully reach the ideal state. And an arc segment of an appropriate size can, to a certain extent, compensate for these deviations and ensure that the sealing effect is not affected. By reducing friction and wear, the precise design of the arc segment radius helps to extend the service life of the electronic expansion valve and its key components.
[0044] Furthermore, the range of the part of the valve port ring 220 that extends beyond the first installation groove 212 is 0.03 mm to 0.10 mm. The compression sleeve 230 and the connecting seat 210 axially compress the valve port ring 220 to ensure the sealing performance.
[0045] To avoid affecting the flow rate of the valve port 201, the compression sleeve 230 is provided with a sleeve opening corresponding to the valve port 201, and the inner diameter of the sleeve opening is the same as the inner diameter of the valve port 201.
[0046] Combined with Figure 2, the electronic expansion valve further includes a return spring, a nut assembly, a rotor assembly, a slip ring and slide rail assembly, a housing, a limiting rod, and a stator coil. The nut assembly is welded and fixedly connected to the connecting seat 210, the connecting seat 210 is welded and fixedly connected to the housing, the slip ring and slide rail assembly is sleeved on the outer periphery of the nut assembly and is fixed relative to the nut assembly, and the slip ring in the slip ring and slide rail assembly can move spirally up and down within the spiral track formed by the slide rail; the first valve needle 100 is a hollow cylindrical structure, a spring, a bearing, a bearing limiting sleeve, and a second valve needle 300 are sequentially arranged on the lead screw, the second valve needle 300 passes through the first valve needle 100, the bearing limiting sleeve is fixedly connected to the lead screw, the second valve needle 300 is riveted and fixedly connected to the bearing, and the bearing and the second valve needle 300 are located at the outermost ends around under the action of the spring. When the second valve needle 300 abuts against the hollow opening of the first valve needle 100, the lead screw continues to rotate downward, the spring can be further compressed, the pressure on the valve needle is increased to make the second valve needle 300 more sealed with the valve port 201, and at the same time, the bearing limiting sleeve can be driven to disengage from the abutment with the bearing. A rubber seal or a rubber and plastic combined seal is arranged between the second valve needle 300 and the inner cavity 211 of the first valve needle 100. The second valve needle 300 can axially move relative to the first valve needle 100 within a certain small distance range (small flow rate adjustment section), and a small clearance fit is formed between the inner cavity 211 of the first valve needle 100 and the second valve needle 300 to provide guidance. The second valve needle 300 forms a sealing fit with the hollow opening of the first valve needle 100, and the first valve needle 100 forms a sealing fit with the valve port 201; in the closed valve state: under the action of the return spring, the first valve needle 100 abuts against and seals the valve port 201. At this time, the second valve needle 300 also abuts against and seals the first valve needle 100.
[0047] Furthermore, continuous laser welding is used at the welding joint, which easily causes deformation of the valve head gasket and affects internal leakage. The connecting seat 210 and the bushing 230 are riveted, so that the bushing 230 can be stably assembled on the connecting seat 210. The connecting seat 210 and the housing are in a sealed connection. Since riveting belongs to cold working, the process operation is simple, reliable connection can be achieved through one-time press-fitting riveting, the consumption of energy and resources is less, and the connection strength of riveting is better than that of laser welding. Such a setting can reduce a certain production cost on the premise of ensuring the connection strength between the bushing 230 and the connecting seat 210, and this production and processing method is energy-saving and environmentally friendly, which is beneficial to environmental protection.
[0048] The present utility model also proposes an air-conditioning system, which includes an electronic expansion valve. The specific structure of the electronic expansion valve refers to the above-mentioned embodiments. Since this electronic expansion valve adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated one by one here. The air-conditioning system includes but is not limited to an automotive air-conditioning system, a heat pump air-conditioning system, and a battery cooling system.
[0049] The above are only exemplary embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields, is included within the patent protection scope of the present utility model.
Claims
1. An electronic expansion valve, characterized in that, Comprising: A first valve needle, provided with an abutting portion; And A valve port assembly, provided with a valve port, the first valve needle being movably disposed within the valve port assembly, and sealing the valve port by contact between the lower end surface of the abutting portion and the upper end surface of the valve port.
2. The electronic expansion valve according to claim 1, characterized in that, The valve port assembly includes a connecting seat, a valve port ring and a compression sleeve. The connecting seat includes a hollow inner cavity. The valve port ring is disposed within the inner cavity. The compression sleeve is connected to the connecting seat and presses the valve port ring. The valve port is disposed on the valve port ring. The diameter of the valve port is smaller than the inner diameter of the inner cavity. The abutting portion contacts the edge surface of the valve port ring to seal the valve port.
3. The electronic expansion valve according to claim 2, wherein The abutting portion is annular, and the lower end surface of the abutting portion is provided with an arc segment.
4. The electronic expansion valve according to claim 3, wherein The radius of the arc segment is 0.3 mm - 0.6 mm.
5. The electronic expansion valve according to claim 2, wherein, The material of the valve port ring is rubber.
6. The electronic expansion valve according to claim 5, characterized in that The material of the valve port ring is carbon black reinforced rubber.
7. The electronic expansion valve according to claim 2, characterized in that The connecting seat is further provided with a first installation groove for installing the valve port ring and a second installation groove for installing the compression sleeve. The first installation groove is smaller than the second installation groove.
8. The electronic expansion valve according to claim 7, wherein The range of the portion of the valve port ring that extends beyond the first installation groove is 0.03 mm to 0.10 mm.
9. The electronic expansion valve according to claim 2, characterized in that, The compression sleeve is provided with a socket, the socket corresponding to the valve port, and the inner diameter of the socket being the same as the inner diameter of the valve port.
10. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve further includes a second valve needle, the second valve needle being movably disposed within the first valve needle to open and close the flow path communicating the first valve needle with the valve port.
11. An air conditioning system, characterized in that, Comprising the electronic expansion valve according to any one of claims 1 to 10.