Electronic expansion valve and refrigeration equipment

Abstract

The utility model discloses an electronic expansion valve and refrigeration equipment, which relates to the technical field of fluid control components, wherein the electronic expansion valve includes a connecting seat assembly, a first valve needle, a first sealing gasket, a second valve needle and a first sealing ring, the second valve needle can move relative to the first valve needle along the axial direction of the accommodating cavity to open or close the flow port, and the second valve needle can also push the first valve needle away from the valve port to make the first valve needle open the valve port; the first sealing ring is arranged between the inner wall of the accommodating cavity and the first sealing gasket. The technical solution of the utility model is to arrange the first sealing ring between the inner wall of the accommodating cavity and the first sealing gasket, and the first sealing gasket and the inner wall of the accommodating cavity are clearance-matched, so that the dimensional accuracy requirements of the accommodating cavity and the first sealing gasket are reduced, thereby reducing the processing difficulty and processing cost of the electronic expansion valve.

Description

Technical Field

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

[0002] For the electronic expansion valve with two valve needles, a small valve port is set in the installation hole of the large valve needle to cooperate with the small valve needle to achieve the regulation of the small flow of the electronic expansion valve. The traditional small valve port is made of metal and is pressed into the installation hole of the large valve needle by tight fit, and then fixed by laser welding. The small valve port and the large valve needle are tight-fitted, resulting in high dimensional accuracy requirements for the small valve port and the large valve needle, which increases the processing cost and difficulty. Utility Model Content

[0003] The main purpose of the utility model is to provide an electronic expansion valve and a refrigeration device, aiming to reduce the difficulty of processing the electronic expansion valve.

[0004] To achieve the above-mentioned purpose, the electronic expansion valve proposed by the utility model comprises:

[0005] A connecting seat assembly having an inner cavity and a valve port communicating with the inner cavity;

[0006] a first valve needle, disposed in the inner cavity and capable of moving along the axial direction of the inner cavity to open or close the valve port, wherein the first valve needle has an accommodating cavity penetrating along the axial direction thereof;

[0007] A first sealing gasket is arranged at one end of the accommodating cavity close to the valve port and is in clearance with the inner wall of the accommodating cavity. The first sealing gasket is provided with a flow port, and the flow port is communicated with the accommodating cavity and the valve port;

[0008] a second valve needle, which is inserted into the accommodating cavity and can move relative to the first valve needle along the axial direction of the accommodating cavity to open or close the flow port, and can also push the first valve needle to move away from the valve port so that the first valve needle opens the valve port; and

[0009] The first sealing ring is arranged between the inner wall of the accommodating cavity and the first sealing pad.

[0010] In one embodiment, a first installation groove is formed on an inner wall of the accommodating cavity at one end close to the valve port, and the first sealing gasket is disposed in the first installation groove.

[0011] In one embodiment, the first mounting groove includes a mounting section and a first guide section in the axial direction, the first guide section is arranged at one end of the mounting section close to the valve port, the diameter of the first guide section is larger than the diameter of the mounting section, and the first sealing ring abuts against the inner wall surface of the first guide section.

[0012] In one embodiment, a second mounting groove is formed on the outer peripheral wall of the first sealing gasket corresponding to the first guide section, and the first sealing ring is disposed in the second mounting groove.

[0013] In one embodiment, the axial height of the first mounting groove in the inner cavity is smaller than the axial height of the first sealing gasket in the inner cavity, and the end surface of the first sealing gasket away from the valve port is provided with a step portion, and the step portion abuts against the inner wall surface of the first valve needle.

[0014] In one embodiment, the inner wall surface of the first valve needle is provided with a puncture portion facing the step portion, and the puncture portion penetrates the step portion.

[0015] In one embodiment, a riveting portion is provided on an end surface of the first valve needle at one end close to the valve port, and the riveting portion rivets the first sealing gasket into the first mounting groove.

[0016] In one embodiment, the inner peripheral wall of the end of the riveting portion away from the end surface is chamfered.

[0017] In one embodiment, the connection between the riveted portion and the end surface is configured as a rounded transition.

[0018] In one embodiment, the electronic expansion valve further includes a gasket, which is disposed between the first sealing gasket and the riveted portion and riveted to the riveted portion.

[0019] In one embodiment, a periphery of an end of the flow port away from the valve port is chamfered.

[0020] In one embodiment, the connection seat assembly includes a connection seat body, a connection seat pressing sleeve and a second sealing gasket, the connection seat pressing sleeve is arranged at one end of the connection seat body and forms a third mounting groove with the connection seat body, the second sealing gasket is arranged in the third mounting groove, the second sealing gasket is annular and forms the valve port;

[0021] The third mounting groove has two groove side walls in the axial direction of the inner cavity, and a groove bottom wall connecting the two groove side walls. The second sealing gasket is arranged in the third mounting groove and is gap-matched with the groove bottom wall. The electronic expansion valve also includes a second sealing ring, which abuts the groove side wall or the groove bottom wall.

[0022] In one embodiment, a height of the third mounting groove in the axial direction of the inner cavity is greater than a height of the second sealing gasket in the axial direction of the inner cavity.

[0023] In one embodiment, a notch groove is provided on the outer surface of the second sealing gasket, the second sealing ring is arranged in the notch groove, and the wire diameter of the second sealing ring is greater than the depth of the notch groove in the axial and / or radial direction of the inner cavity.

[0024] In one embodiment, the second sealing gasket includes a second guide section and a sealing section connected to each other, the sealing section is arranged at an end of the second guide section away from the first valve needle, the second sealing ring is arranged on the sealing section, and the outer diameter of the second guide section is smaller than the outer diameter of the sealing section.

[0025] The utility model also provides a refrigeration device, comprising the aforementioned electronic expansion valve.

[0026] The technical solution of the utility model realizes the seal between the first valve needle and the first sealing gasket by arranging a first sealing ring between the inner wall of the accommodating cavity and the first sealing gasket, and the first sealing gasket and the inner wall of the accommodating cavity are clearance-matched, thereby reducing the requirement for dimensional accuracy of the accommodating cavity and the first sealing gasket, thereby reducing the processing difficulty and processing cost of the first valve needle and the first sealing gasket, thereby reducing the processing difficulty and processing cost of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 A structural schematic diagram of an embodiment of an electronic expansion valve provided by the utility model;

[0029] Figure 2 for Figure 1 A schematic structural diagram of an embodiment of a middle valve needle assembly;

[0030] Figure 3 for Figure 2 A schematic structural diagram of an embodiment of a first valve needle;

[0031] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0032] Figure 5 for Figure 2 A schematic structural diagram of an embodiment of a first sealing gasket;

[0033] Figure 6 for Figure 1A schematic structural diagram of another embodiment of the middle valve needle assembly;

[0034] Figure 7 for Figure 6 A schematic structural diagram of another embodiment of the first valve needle;

[0035] Figure 8 for Figure 7 A partial enlarged view of point B in the middle;

[0036] Fig. 9 for Figure 6 A schematic structural diagram of another embodiment of the first sealing gasket;

[0037] Fig.10 for Figure 1 A schematic structural diagram of an embodiment of a middle connecting seat body and a connecting seat pressing sleeve;

[0038] Fig.11 for Figure 1 A schematic structural diagram of an embodiment of a second sealing gasket.

[0039] Description of Figure Numbers:

[0040] 10. Electronic expansion valve; 100. Connecting seat assembly; 200. First valve needle; 300. Second valve needle; 400. First sealing gasket; 500. First sealing ring; 600. Second sealing ring; 700. Gasket; 110. Connecting seat body; 120. Connecting seat sleeve; 130. Second sealing gasket; 131. Notch groove; 132. Second guide section; 133. Sealing section; 140. Inner cavity; 150. Valve port; 160. Third mounting groove; 161. Groove bottom wall; 162. Groove side wall; 210. Accommodating cavity; 220. First mounting groove; 221. First guide section; 222. Mounting section; 230. Puncture portion; 240. Riveted portion; 410. Flow port; 420. Second mounting groove; 430. Step portion.

[0041] 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

[0042] 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.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0045] The utility model provides an electronic expansion valve 10 .

[0046] The electronic expansion valve 10 proposed in the utility model can be applied to a refrigeration system, and the fluid medium flowing through the electronic expansion valve 10 is a refrigerant used for heat exchange in the refrigeration system. At this time, the electronic expansion valve 10 is installed at the inlet of the evaporator of the refrigeration system. The electronic expansion valve 10 serves as a dividing element between the high-pressure side and the low-pressure side of the refrigeration system, and throttles and reduces the pressure of the high-pressure liquid refrigerant from the liquid storage dryer and other devices, thereby adjusting and controlling the dosage of the liquid refrigerant entering the evaporator, so that the dosage of the liquid refrigerant can meet the requirements of the external refrigeration load. The electronic expansion valve 10 can be applied to an air-conditioning system or a vehicle heat pump thermal management system, and the fluid medium flowing through the electronic expansion valve 10 can also be other fluid media except the refrigerant, as long as the electronic expansion valve 10 can achieve throttling and reducing the pressure of the fluid medium, there is no specific restriction on this.

[0047] See also Figure 1 and Figure 2In one embodiment of the utility model, the electronic expansion valve 10 includes a connection seat assembly 100, a first valve needle 200, a first sealing gasket 400, a second valve needle 300 and a first sealing ring 500. The connection seat assembly 100 has an inner cavity 140 and a valve port 150 connected to the inner cavity 140; the first valve needle 200 is arranged in the inner cavity 140 and can move along the axial direction of the inner cavity 140 to open or close the valve port 150. The first valve needle 200 has an accommodating cavity 210 that passes through the axial direction thereof; the first sealing gasket 400 is arranged at one end of the accommodating cavity 210 close to the valve port 150 and is connected to the inner cavity 140. The inner wall clearance of the accommodating chamber 210 is matched, and the first sealing gasket 400 is provided with a flow port 410, and the flow port 410 is connected with the accommodating chamber 210 and the valve port 150; the second valve needle 300 is penetrated by the accommodating chamber 210, and the second valve needle 300 can move relative to the first valve needle 200 along the axial direction of the accommodating chamber 210 to open or close the flow port 410, and the second valve needle 300 can also push the first valve needle 200 to move away from the valve port 150, so that the first valve needle 200 opens the valve port 150; the first sealing ring 500 is arranged between the inner wall of the accommodating chamber 210 and the first sealing gasket 400.

[0048] Specifically, the electronic expansion valve 10 includes a connection seat assembly 100 and a valve needle assembly, and the valve needle assembly includes a first valve needle 200, a first sealing gasket 400, a second valve needle 300 and a first sealing ring 500. The connection seat assembly 100 has an inner cavity 140 and a valve port 150. The end of the connection seat assembly 100 away from the valve port 150 is used to connect to the valve shell of the electronic expansion valve 10, and the outer periphery of the connection seat assembly 100 is used to connect to the valve seat of the electronic expansion valve 10, or directly installed in the pipeline of the refrigeration system. The side wall of the connection seat assembly 100 has a medium inlet connected to the inner cavity 140, and the fluid can flow into the inner cavity 140 from the medium inlet and then flow out from the valve port 150.

[0049] The first valve needle 200 is generally in the shape of a hollow cylinder. The first valve needle 200 can move along the axial direction of the inner cavity 140 to open or close the valve port 150. When the first valve needle 200 abuts against the inner peripheral wall of the valve port 150, the first valve needle 200 forms a sealing fit with the valve port 150. The first valve needle 200 has a housing cavity 210, which penetrates along the axial direction of the first valve needle 200 and communicates with the inner cavity 140. The second valve needle 300 and the first sealing gasket 400 are arranged in the housing cavity 210. The first sealing gasket 400 is provided with a flow port 410, which communicates with the housing cavity 210 and the valve port 150; the second valve needle 300 is connected to the screw of the electronic expansion valve 10, and a certain regular electric pulse is applied to the coil of the driving component to stimulate the rotation of the rotor component, thereby driving the screw to rotate in the nut body and move along the axial direction of the electronic expansion valve 10, so as to drive the second valve needle 300 to open and close the flow port 410. During the movement of the second valve needle 300, the second valve needle 300 has a first stroke of relative movement with the first valve needle 200 and a second stroke of pushing the first valve needle 200 and driving the first valve needle 200 to move away from the valve port 150. Thus, the second valve needle 300 and the first sealing gasket 400 realize small flow regulation, and the first valve needle 200 and the valve port 150 cooperate to realize full flow regulation, which can meet the flow regulation function of different requirements, so that the electronic expansion valve 10 can realize accurate flow control under different working conditions.

[0050] When the second valve needle 300 abuts against the inner circumferential wall of the flow port 410, and the second valve needle 300 forms a sealing match with the first sealing gasket 400, the sealing between the first sealing gasket 400 and the inner wall of the accommodating chamber 210 will affect the internal leakage, so the sealing structure here is very critical. In order to ensure the sealing performance between the first sealing gasket 400 and the inner wall of the accommodating chamber 210, a small gap is used between the first sealing gasket 400 and the inner wall of the accommodating chamber 210, and a first sealing ring 500 is arranged between the first sealing gasket 400 and the inner wall of the accommodating chamber 210, and the first sealing ring 500 abuts against the inner wall of the accommodating chamber 210 and the outer wall of the first sealing gasket 400, thereby achieving the sealing between the inner wall of the accommodating chamber 210 and the first sealing gasket 400, and avoiding the internal leakage between the inner wall of the accommodating chamber 210 and the first sealing gasket 400.

[0051] Since the first sealing gasket 400 and the inner wall of the accommodating cavity 210 are matched with a small gap, the requirements for the dimensional accuracy of the accommodating cavity 210 and the first sealing gasket 400 can be reduced, thereby reducing the processing difficulty and processing cost of the first valve needle 200 and the first sealing gasket 400. In addition, the first sealing gasket 400 and the inner wall of the accommodating cavity 210 are matched with a small gap, which makes it easier to assemble the first sealing gasket 400 and the accommodating cavity 210, and improves the assembly efficiency of the first sealing gasket 400. The gap between the first sealing gasket 400 and the inner wall of the accommodating cavity 210 is L1, 0mm<L1≤0.05mm.

[0052] The first sealing gasket 400 can be made of metal or non-metal material, preferably PTFE or PPS. PTFE is polytetrafluoroethylene, which has excellent high temperature resistance and corrosion resistance. PPS is polyphenylene sulfide, which has good mechanical properties and chemical resistance, and is suitable for sealing applications in high temperature and chemical corrosion environments. The first sealing gasket 400 uses PTFE and PPS to have good sealing performance. Moreover, the first sealing gasket 400 uses PTFE or PPS material, which itself has a certain self-lubricating effect, which not only improves the internal leakage sealing effect, but also effectively prevents jamming and improves the reliability of the electronic expansion valve 10. In addition, 10%-30% of glass fiber can be appropriately added to PTFE or PPS. Adding glass fiber can enhance the strength and wear resistance of the material, thereby improving the sealing performance and durability of the first sealing gasket 400. The first sealing ring 500 is made of rubber material or a combination of rubber and plastic.

[0053] The first sealing pad 400 and the first sealing ring 500 can be provided separately or integrally. When the first sealing pad 400 and the first sealing ring 500 are integrally provided, the integral structure is preferably made of rubber material.

[0054] The technical solution of the utility model realizes the sealing between the first valve needle 200 and the first sealing gasket 400 by arranging the first sealing ring 500 between the inner wall of the accommodating cavity 210 and the first sealing gasket 400, and the first sealing gasket 400 and the inner wall of the accommodating cavity 210 are clearance-matched, so that the requirement of dimensional accuracy of the accommodating cavity 210 and the first sealing gasket 400 is reduced, thereby reducing the processing difficulty and processing cost of the first valve needle 200 and the first sealing gasket 400, thereby reducing the processing difficulty and processing cost of the electronic expansion valve 10.

[0055] In one embodiment, a first installation groove 220 is formed on an inner wall of the accommodating cavity 210 at one end close to the valve port 150 , and the first sealing gasket 400 is disposed in the first installation groove 220 .

[0056] See also Figure 2 and Figure 3The first mounting groove 220 extends along the circumference of the inner wall of the accommodating cavity 210 and is annular. The function of the first mounting groove 220 is to provide a precise positioning and fixing position for the first sealing gasket 400, so as to better accommodate the first sealing gasket 400, ensure that the connection between the first sealing gasket 400 and the first valve needle 200 is firm and reliable, and effectively prevent loosening or falling off due to vibration or pressure changes. The first sealing gasket 400 is placed in the first mounting groove 220, which can prevent the first sealing gasket 400 from shifting or misaligning, resulting in the failure of the seal between the first sealing gasket 400 and the second valve needle 300.

[0057] In one embodiment, the first mounting groove 220 includes a mounting section 222 and a first guide section 221 in its axial direction. The first guide section 221 is arranged at one end of the mounting section 222 close to the valve port 150. The diameter of the first guide section 221 is larger than the diameter of the mounting section 222. The first sealing ring 500 abuts against the inner wall surface of the first guide section 221.

[0058] See also Figures 2 to 4 When assembling the first sealing gasket 400, the first sealing gasket 400 is installed into the first mounting groove 220 from the first guide section 221 at the end close to the valve port 150. Since the diameter of the first guide section 221 is larger than the diameter of the mounting section 222, the first guide section 221 plays a guiding role, and the first sealing gasket 400 can be installed into the first mounting groove 220 more easily. After the assembly, the first sealing gasket 400 is partially arranged in the mounting section 222, and partially arranged in the first guide section 221. The first sealing ring 500 is arranged between the first guide section 221 and the first sealing gasket 400, and abuts against the inner wall surface of the first guide section 221 and the outer wall surface of the first sealing gasket 400. In this way, it can be ensured that the first sealing gasket 400 is matched with the mounting section 222 and the first guide section 221 with a small gap, and the first sealing gasket 400 does not need to be processed in sections to form a gap match with the mounting section 222 and the first guide section 221. In addition, the first sealing ring 500 is disposed on the first guide section 221 , which can also reduce the difficulty of assembling the first sealing ring 500 .

[0059] In one embodiment, a second installation groove 420 is formed on the outer peripheral wall of the first sealing pad 400 corresponding to the first guide section 221 , and the first sealing ring 500 is disposed in the second installation groove 420 .

[0060] See also Figure 2 and Figure 5, a small gap is used between the first sealing gasket 400 and the inner wall of the accommodating cavity 210. If a first sealing ring 500 with a smaller wire diameter is used, the sealing effect is poor; if a first sealing ring 500 with a larger wire diameter is directly used, it is difficult to fit into the gap between the first sealing gasket 400 and the inner wall of the accommodating cavity 210. Therefore, by providing a second installation groove 420 on the outer peripheral wall of the first sealing gasket 400 corresponding to the first guide section 221, and the first sealing ring 500 is provided in the second installation groove 420, on the one hand, the above problems of poor sealing effect and difficulty in assembly can be solved, and on the other hand, the second installation groove 420 can limit the first sealing ring 500 to avoid displacement or misalignment of the first sealing ring 500, resulting in sealing failure.

[0061] In one embodiment, the axial height of the first mounting groove 220 in the inner cavity 140 is smaller than the axial height of the first sealing gasket 400 in the inner cavity 140 , and a step portion 430 is provided on the end surface of the first sealing gasket 400 away from the valve port 150 , and the step portion 430 abuts against the inner wall surface of the first valve needle 200 .

[0062] See also Figure 6 and Fig. 9 The first sealing gasket 400 is made of non-metallic material. After the first sealing gasket 400 is installed in the first installation groove 220, since the axial height of the first installation groove 220 in the inner cavity 140 is less than the axial height of the first sealing gasket 400 in the inner cavity 140, the first sealing gasket 400 is squeezed in the axial direction of the inner cavity 140 and abuts against the inner wall surface of the first installation groove 220 to achieve the sealing between the first valve needle 200 and the first sealing gasket 400, and the first sealing gasket 400 and the inner wall of the accommodating cavity 210 adopt a clearance fit, so that the dimensional accuracy requirements of the accommodating cavity 210 and the first sealing gasket 400 are reduced, thereby reducing the processing difficulty and processing cost of the first valve needle 200 and the first sealing gasket 400, thereby reducing the processing difficulty and processing cost of the electronic expansion valve 10.

[0063] Since the height of the first mounting groove 220 in the axial direction of the inner cavity 140 is smaller than the height of the first sealing gasket 400 in the axial direction of the inner cavity 140, the first sealing gasket 400 will be deformed after being squeezed in the axial direction of the inner cavity 140, and the position and diameter of the flow port 410 may change, making it difficult to abut and cooperate with the second valve needle 300 to achieve sealing. By providing a step portion 430 on the end surface of the first sealing gasket 400 away from the valve port 150, the step portion 430 bears the risk of deformation after being squeezed, which can not only meet the sealing between the first sealing gasket 400 and the first valve needle 200, but also avoid deformation of the flow port 410.

[0064] In one embodiment, the inner wall surface of the first valve needle 200 is provided with a puncture portion 230 facing the step portion 430 , and the puncture portion 230 penetrates into the step portion 430 .

[0065] See also Figure 7 and Figure 8 The puncture portion 230 is cone-shaped, and the hardness of the puncture portion 230 is greater than the hardness of the step portion 430, so that the puncture portion 230 can penetrate the step portion 430, and limit and fix the step portion 430, thereby achieving a stable connection between the first valve needle 200 and the first sealing gasket 400.

[0066] In one embodiment, a riveting portion 240 is provided on an end surface of the first valve needle 200 close to the valve port 150 , and the riveting portion 240 rivets the first sealing gasket 400 into the first installation groove 220 .

[0067] See also Figure 2 and Figure 6 The traditional first sealing gasket 300 is made of metal and is pressed into the large valve needle mounting hole through a tight fit, and then fixed by laser welding. As a result, the welding process consumes a lot of energy, and the welding process is prone to generate smoke and harmful gases, which is not conducive to the health of operators and environmental protection. In addition, the welding energy is high, and the welding heat is easily transmitted to the first sealing ring 500 or other sealing structures of the electronic expansion valve 10, causing the rubber material sealing structure to deform due to heat, thereby causing its sealing effect to deteriorate, and then causing internal leakage to exceed the standard, affecting the system energy efficiency. In addition, welding requires continuous sealing welding, and the welding process requirements are high. The production process has a high rate of welding leakage, which affects the product qualification rate, and then affects the overall cost of the product and the market competitiveness of the product. The laser welding equipment cost is high, the equipment recovery period is long, and the product equipment amortization cost is high.

[0068] In this embodiment, a riveting portion 240 is provided on the end surface of the first valve needle 200 close to the valve port 150, and the first sealing gasket 400 is riveted into the first mounting groove 220 by flanging riveting, so as to realize the fixed connection between the first sealing gasket 400 and the first valve needle 200. By adopting the riveting process, the welding of the first sealing gasket 400 and the first valve needle 200 can be replaced, which is pollution-free, non-toxic, harmless, energy-saving and environmentally friendly; by riveting instead of welding, the influence of welding on the thermal deformation of the first sealing ring 500 can be avoided, and the internal leakage will not be affected, which can improve the energy efficiency of the system. In addition, the riveting process is relatively mature, and the overall qualified rate is high, which can improve the market competitiveness of the product. In addition, the investment in the production line equipment of the riveting process is small, and the product equipment amortization is low, which can improve the gross profit and market competitiveness of the product.

[0069] In one embodiment, the inner peripheral wall of the end of the riveting portion 240 away from the end surface is chamfered.

[0070] See also Figure 5The inner peripheral wall of the end of the rivet 240 away from the end surface is chamfered to improve assembly performance, provide a guide for the first sealing gasket 400, and make it easier to insert the first sealing gasket 400 into the first installation groove 220, so as to reduce assembly difficulty and improve assembly efficiency; it can prevent the first sealing gasket 400 from scratching or damaging the rivet 240 during assembly. The chamfer angle is preferably set at 15°≤φ≤30°, the chamfer length is preferably set at 0.3mm≤C1≤1mm, and the wall thickness of the rivet 240 is preferably 0.1mm≤H1≤0.2mm.

[0071] In one embodiment, the connection between the riveted portion 240 and the end surface is configured as a rounded transition.

[0072] See also Figure 5 Sharp corners or right-angled edges easily become stress concentration points, which may cause material fatigue or even fracture under long-term stress. The rounded transition can disperse stress, make the stress distribution more uniform, and improve the strength and durability of the connection between the riveted part 240 and the end face. Moreover, the rounded transition can reduce the local stress peak and avoid the early initiation and expansion of cracks, thereby significantly improving its fatigue resistance and extending its service life. The radius of the fillet at the connection between the riveted part 240 and the end face is preferably 0.2mm≤R2≤0.5mm. Before the riveting operation of the riveted part 240 is performed, the distance between the end of the riveted part 240 away from the end face and the end face of the first sealing gasket 400 close to the valve port 150 is H2, 0.5mm≤H2≤1.0mm.

[0073] In one embodiment, the electronic expansion valve 10 further includes a gasket 700 , which is disposed between the first sealing gasket 400 and the riveted portion 240 and riveted to the riveted portion 240 .

[0074] See also Figure 6 , the first sealing gasket 400 can be made of metal or non-metal. For the first sealing gasket 400 made of non-metal, in order to reduce the deformation of the non-metal first sealing gasket 400 during the riveting process, a gasket 700 can be provided at the position where the riveting part 240 and the non-metal first sealing gasket 400 are riveted, for buffering and dispersing the riveting force, thereby preventing the non-metal first sealing gasket 400 from deforming during the riveting process. Before the riveting part 240 is riveted, the distance between the end of the riveting part 240 away from the end face and the end face of the gasket 700 close to the valve port 150 is H2, 0.5mm≤H2≤1.0mm.

[0075] In one embodiment, the periphery of one end of the flow port 410 away from the valve port 150 is chamfered.

[0076] See also Figure 5 and Fig. 9, the flow port 410 is opened or closed by the second valve needle 300, so as to realize the small flow regulation of the electronic expansion valve 10. The periphery of the flow port 410 away from the valve port 150 is set at a chamfered right angle or a chamfered corner. When the second valve needle 300 abuts against the flow port 410, the second valve needle 300 can achieve a line seal with the chamfer, thereby reducing the risk of internal leakage between the second valve needle 300 and the flow port 410. In addition, the periphery of the flow port 410 away from the valve port 150 is set at a chamfered right angle or a chamfered corner, which can improve the surface quality of the first sealing gasket 400, reduce the sharpness of the edge, and facilitate the safety and reliability during assembly and use. When the periphery of the flow port 410 away from the valve port 150 is set at a chamfered right angle, the size range of the chamfer is preferably 0.1mm≤C2≤0.3mm. When the periphery of the flow port 410 away from the valve port 150 is set at a chamfered corner, the radius of the fillet is preferably 0.1mm≤R1≤0.3mm.

[0077] In one embodiment, the connecting seat assembly 100 includes a connecting seat body 110, a connecting seat sleeve 120 and a second sealing gasket 130. The connecting seat sleeve 120 is arranged at one end of the connecting seat body 110 and forms a third mounting groove 160 with the connecting seat body 110. The second sealing gasket 130 is arranged in the third mounting groove 160. The second sealing gasket 130 is annular and forms a valve port 150. The third mounting groove 160 has two groove side walls 162 in the axial direction of the inner cavity 140, and a groove bottom wall 161 connecting the two groove side walls 162. The second sealing gasket 130 is arranged in the third mounting groove 160 and is gap-matched with the groove bottom wall 161. The electronic expansion valve 10 also includes a second sealing ring 600, which abuts the groove side wall 162 or the groove bottom wall 161.

[0078] See also Figure 1 and Fig.10 The traditional electronic expansion valve 10 is provided with a second sealing gasket 130 at the valve port 150 of the connecting seat or the valve seat, and the second sealing gasket 130 and the connecting seat are radially interference fit. However, this interference fit method has high requirements on the precision of the second sealing gasket 130, high tolerance grade, high processing cost and difficulty, which invisibly affects the comprehensive cost of the product and affects the market competitiveness.

[0079] The technical solution of the utility model is to set a first sealing ring 500 between the inner wall of the third installation groove 160 and the second sealing gasket 130 to achieve the sealing between the connection seat body 110, the connection seat pressing sleeve 120 and the second sealing gasket 130, and the second sealing gasket 130 and the inner wall of the third installation groove 160 are matched with clearance, so that the requirements for the dimensional accuracy of the third installation groove 160 and the second sealing gasket 130 are reduced, thereby reducing the processing difficulty and processing cost of the connection seat assembly 100 and the second sealing gasket 130, thereby reducing the processing difficulty and processing cost of the electronic expansion valve 10. In addition, the use of this second sealing ring 600 extrusion seal structure can avoid the risk of internal leakage of the product itself, and can resist various harsh and complex environmental conditions, with good sealing effect, thereby improving the sealing performance and reliability of the product.

[0080] The gap between the second sealing gasket 130 and the bottom wall 161 of the third mounting groove 160 is L2, 0.02mm≤L2≤0.05mm. The second sealing gasket 130 is preferably made of PTFE, and 10%-30% of glass fiber can be appropriately added to PTFE to improve the sealing performance and durability of the second sealing gasket 130. The compression amount of the second sealing ring 600 is preferably between 0.1mm≤δ≤0.4mm. Excessive compression will cause the second sealing ring 600 to be over-extruded, resulting in plastic deformation, reducing the sealing performance, and may cause the sealing ring to fail prematurely. Too little compression may not be sufficient to form an effective seal, resulting in leakage. The second sealing ring 600 is made of rubber, and carbon black and other components that increase the hardness and stability of the material can be appropriately added.

[0081] The second sealing pad 130 and the second sealing ring 600 can be provided separately or integrally. When the second sealing pad 130 and the second sealing ring 600 are integrally provided, the integrated structure is preferably made of rubber material.

[0082] In one embodiment, a height of the third mounting groove 160 in the axial direction of the inner cavity 140 is greater than a height of the second sealing gasket 130 in the axial direction of the inner cavity 140 .

[0083] See also Figure 1 The second sealing gasket 130 of the conventional electronic expansion valve 10 and the connecting seat use the mounting cavity formed by the connecting seat to axially squeeze the height of the second sealing gasket 130 to form an extrusion static seal, which easily causes the sealing cone surface of the second sealing gasket 130 to deform, affecting the sealing between the first valve needle 200 and the second sealing gasket 130, affecting the internal leakage performance, causing leakage, affecting the system energy efficiency, and even causing the entire system to fail. In addition, the environment of the vehicle heat pump system is relatively harsh and demanding. With this extrusion seal, the second sealing gasket 130 is easily affected by the environment, thermal expansion and contraction, affecting the sealing performance and causing the system to fail.

[0084] Therefore, by setting the height of the third mounting groove 160 in the axial direction of the inner cavity 140 to be greater than the height of the second sealing gasket 130 in the axial direction of the inner cavity 140, the second sealing gasket 130 is prevented from being squeezed and deformed in the axial direction of the inner cavity 140, thereby avoiding the risk of internal leakage of the product itself. At the same time, since the height of the third mounting groove 160 in the axial direction of the inner cavity 140 is greater than the height of the second sealing gasket 130 in the axial direction of the inner cavity 140, the connection seat assembly 100 is not sensitive to dimensional accuracy, and the design accuracy of the connection seat assembly 100 can be appropriately relaxed, reducing the processing difficulty of the connection seat assembly 100, reducing the processing and manufacturing costs to a certain extent, and improving the market competitiveness of the product. In addition, the second sealing gasket 130 and the connection seat body 110 and the connection seat pressure sleeve 120 are sealed by the second sealing ring 600, and the sealing effect is good, which can avoid the risk of the second sealing gasket 130 being affected by the environment due to thermal expansion and contraction, resulting in reduced sealing performance, so that the electronic expansion valve 10 can resist various harsh and complex environmental conditions, thereby improving the sealing performance and reliability of the product. A height difference between the third mounting groove 160 and the second sealing gasket 130 in the axial direction of the inner cavity 140 is ΔH, and 0.02 mm≤ΔH≤0.05 mm.

[0085] In one embodiment, a notch groove 131 is provided on the outer surface of the second sealing gasket 130 , and the second sealing ring 600 is disposed in the notch groove 131 . The wire diameter of the second sealing ring 600 is greater than the axial and / or radial depth of the notch groove 131 in the inner cavity 140 .

[0086] See also Figure 1 and Fig.11 , the second sealing ring 600 is embedded in the notch groove 131 to play a sealing role. In order to ensure that the second sealing ring 600 can be effectively compressed and form a seal, its wire diameter (i.e., cross-sectional diameter) is larger than the depth of the notch groove 131 in the axial direction and / or radial direction of the inner cavity 140. When the second sealing ring 600 abuts the groove side wall 162, the wire diameter of the second sealing ring 600 is larger than the depth of the notch groove 131 in the axial direction of the inner cavity 140; when the second sealing ring 600 abuts the groove bottom wall 161, the wire diameter of the second sealing ring 600 is larger than the depth of the notch groove 131 in the radial direction of the inner cavity 140; when the second sealing ring 600 abuts the groove bottom wall 161 and the groove side wall 162 close to the valve port 150 at the same time, the wire diameter of the second sealing ring 600 is larger than the depth of the notch groove 131 in the axial direction and / or radial direction of the inner cavity 140.

[0087] The wire diameter of the second sealing ring 600 is greater than the depth of the notch groove 131. When the second sealing ring 600 is installed in the notch groove 131, the second sealing ring 600 will be compressed, thereby forming a close contact between the second sealing gasket 130 and the connecting seat body 110 and the connecting seat pressing sleeve 120, thereby achieving a sealing effect and ensuring that good sealing performance can be maintained even under harsh working conditions such as high pressure or high temperature.

[0088] In one embodiment, the second sealing gasket 130 includes a second guide section 132 and a sealing section 133 connected to each other. The sealing section 133 is arranged at one end of the second guide section 132 away from the first valve needle 200, and the second sealing ring 600 is arranged on the sealing section 133. The outer diameter of the second guide section 132 is smaller than the outer diameter of the sealing section 133.

[0089] See also Figure 1 and Fig.11 When assembling the second sealing gasket 130, the second sealing gasket 130 first installs the second guide section 132 into the third installation groove 160 from the end close to the valve port 150. Since the outer diameter of the second guide section 132 is smaller than the outer diameter of the sealing section 133, the second guide section 132 plays a guiding role, and the second sealing gasket 130 can be more easily installed in the third installation groove 160. The second sealing ring 600 is arranged at the sealing section 133. In this way, it can be ensured that the second guiding section 132 and the sealing section 133 are both matched with the groove bottom wall 161 with a small gap, and the groove bottom wall 161 does not need to be processed in sections to form a gap fit with the sealing section 133 and the second guiding section 132. In addition, the second sealing ring 600 is arranged at the sealing section 133, which can also reduce the difficulty of assembling the second sealing ring 600. The second guiding section 132 and the sealing section 133 are processed from the second sealing gasket 130, and the processing difficulty is lower. The outer diameter of the sealing section 133 is D1, and the outer diameter of the second guide section 132 is D2, 0.05 mm ≤ D1 - D2 ≤ 0.15 mm.

[0090] The utility model also proposes a refrigeration device, which includes an electronic expansion valve 10. The specific structure of the electronic expansion valve 10 refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0091] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: A connecting seat assembly having an inner cavity and a valve port communicating with the inner cavity; a first valve needle, disposed in the inner cavity and capable of moving along the axial direction of the inner cavity to open or close the valve port, wherein the first valve needle has an accommodating cavity penetrating along the axial direction thereof; A first sealing gasket is arranged at one end of the accommodating cavity close to the valve port and is in clearance with the inner wall of the accommodating cavity. The first sealing gasket is provided with a flow port, and the flow port is communicated with the accommodating cavity and the valve port; a second valve needle, which is inserted into the accommodating cavity and can move relative to the first valve needle along the axial direction of the accommodating cavity to open or close the flow port, and can also push the first valve needle to move away from the valve port so that the first valve needle opens the valve port; and The first sealing ring is arranged between the inner wall of the accommodating cavity and the first sealing pad.

2. The electronic expansion valve according to claim 1, characterized in that: A first installation groove is formed on one end of the inner wall of the accommodating cavity close to the valve port, and the first sealing gasket is arranged in the first installation groove.

3. The electronic expansion valve according to claim 2, characterized in that: The first mounting groove includes a mounting section and a first guide section in its axial direction. The first guide section is arranged at one end of the mounting section close to the valve port. The diameter of the first guide section is larger than the diameter of the mounting section. The first sealing ring abuts against the inner wall surface of the first guide section.

4. The electronic expansion valve according to claim 3, characterized in that: A second mounting groove is provided on the outer peripheral wall of the first sealing pad corresponding to the first guide section, and the first sealing ring is arranged in the second mounting groove.

5. The electronic expansion valve according to claim 2, characterized in that: The axial height of the first mounting groove in the inner cavity is smaller than the axial height of the first sealing gasket in the inner cavity, and a step portion is provided on an end surface of the first sealing gasket away from the valve port, and the step portion abuts against an inner wall surface of the first valve needle.

6. The electronic expansion valve according to claim 5, characterized in that: The inner wall surface of the first valve needle is provided with a puncture portion facing the step portion, and the puncture portion penetrates the step portion.

7. The electronic expansion valve according to claim 2, characterized in that: A riveting portion is provided on an end surface of the first valve needle close to the valve port, and the riveting portion rivets the first sealing gasket into the first installation groove.

8. The electronic expansion valve according to claim 7, characterized in that: The inner peripheral wall of one end of the riveting portion away from the end surface is chamfered; And / or, the connection between the riveted portion and the end surface is configured as a rounded transition.

9. The electronic expansion valve according to claim 7, characterized in that: The electronic expansion valve further includes a gasket, which is disposed between the first sealing pad and the riveted portion and is riveted to the riveted portion.

10. The electronic expansion valve according to claim 1, characterized in that: The periphery of one end of the flow port away from the valve port is chamfered.

11. The electronic expansion valve according to any one of claims 1 to 10, characterized in that: The connecting seat assembly includes a connecting seat body, a connecting seat pressing sleeve and a second sealing gasket, wherein the connecting seat pressing sleeve is arranged at one end of the connecting seat body and forms a third mounting groove with the connecting seat body, and the second sealing gasket is arranged in the third mounting groove, and the second sealing gasket is annular and forms the valve port; The third mounting groove has two groove side walls in the axial direction of the inner cavity, and a groove bottom wall connecting the two groove side walls. The second sealing gasket is arranged in the third mounting groove and is gap-matched with the groove bottom wall. The electronic expansion valve also includes a second sealing ring, which abuts the groove side wall or the groove bottom wall.

12. The electronic expansion valve according to claim 11, characterized in that: A height of the third mounting groove in the axial direction of the inner cavity is greater than a height of the second sealing gasket in the axial direction of the inner cavity.

13. The electronic expansion valve according to claim 12, characterized in that: The outer surface of the second sealing pad is provided with a notch groove, the second sealing ring is arranged in the notch groove, and the wire diameter of the second sealing ring is greater than the depth of the notch groove in the axial direction and / or radial direction of the inner cavity.

14. The electronic expansion valve according to claim 11, characterized in that: The second sealing gasket includes a second guide section and a sealing section connected to each other. The sealing section is arranged at an end of the second guide section away from the first valve needle. The second sealing ring is arranged on the sealing section. The outer diameter of the second guide section is smaller than the outer diameter of the sealing section.

15. A refrigeration device, characterized in that: Comprising the electronic expansion valve as claimed in any one of claims 1 to 14.

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