Electronic expansion valve and air conditioning system

Abstract

The utility model discloses an electronic expansion valve and an air conditioning system, and relates to the technical field of electronic expansion valves, the electronic expansion valve comprises a first valve needle and a valve port assembly, the valve port assembly comprises a connecting seat, a valve port ring and a pressing sleeve, the connecting seat comprises a limiting part, a connecting part located below the limiting part and a hollow inner cavity, and the valve port ring is located in the inner cavity. The valve port ring is arranged in the inner cavity and abuts against the limiting part, the pressing sleeve is connected with the connecting part, the valve port ring and the limiting part axially press the valve port ring, the valve port ring is provided with a valve port communicated with the inner cavity, the first valve needle is movably arranged on the connecting base, and the second valve needle is movably arranged on the connecting base. And a flow path through which the connecting seat is communicated with the valve port is opened and closed. The technical scheme provided by the utility model aims to solve the problems of separation and internal leakage of the sealing ring caused by insufficient limiting of the sealing ring by a valve port piece under the condition of a large-diameter valve port of the electronic expansion valve.

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 adjust and control the refrigerant flow rate entering 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 valve port of the valve port part in the connection seat is in contact with the inner wall of the valve needle for sealing, and a gland is sleeved on the connection seat to press the valve port part. In order to avoid internal leakage, a sealing ring needs to be arranged inside the valve port part to ensure the sealing effect; however, as the diameter of the valve port increases, the limit of the sealing ring by the valve port part is likely to fail, resulting in the sealing ring being flushed out, and the sealing between the valve needle and the valve port is not tight, resulting in internal leakage. Summary of the Utility Model

[0003] The main object of the utility model is to propose an electronic expansion valve and an air conditioning system, aiming at the problems of the sealing ring coming off and internal leakage caused by insufficient limitation of the sealing ring by the valve port part under the condition of a large-diameter valve port of the electronic expansion valve.

[0004] To achieve the above object, the electronic expansion valve proposed by the utility model includes:

[0005] A first valve needle; and

[0006] A valve port assembly, including a connection seat, a valve port ring, and a gland. The connection seat includes a limiting part, a connection part located below the limiting part, and a hollow inner cavity. The valve port ring is arranged in the inner cavity and abuts against the limiting part. The gland is connected to the connection part and axially presses the valve port ring with the limiting part. The valve port ring is provided with a valve port communicating with the inner cavity. The first valve needle is movably arranged in the connection seat to open and close the flow path communicating the connection seat with the valve port.

[0007] In an embodiment, the valve port ring and the gland are sequentially arranged in the inner cavity, and the limiting part and the gland axially press the valve port ring.

[0008] In an embodiment, a through hole is defined in the middle of the limiting part. The valve port is arranged as a conical surface in the axial direction away from the first valve needle, and the diameter of the through hole is greater than or equal to the maximum diameter of the valve port.

[0009] In an embodiment, the range of the angle formed by the conical surface and the axis is 40° - 120°.

[0010] In an embodiment, the through hole is arranged as a diversion inclined surface in the axial direction away from the first valve needle.

[0011] In one embodiment, the included angle between the diversion inclined plane and the radial direction is ≥ 120°.

[0012] In one embodiment, the contact part of the limiting part with the ring width of the valve port ring is greater than or equal to 2 / 3 of the width of the ring width.

[0013] In one embodiment, the connecting part and the inner wall of the inner cavity define an installation groove for installing the compression sleeve, and the diameter of the installation groove is greater than the diameter of the inner cavity.

[0014] In one embodiment, the limiting part and the installation groove define a receiving groove for installing the valve port part on the inner wall, a part of the valve port part extends beyond the installation groove, and the length range of the part extending beyond the receiving groove is 0.03 mm - 0.12 mm.

[0015] In one embodiment, a guiding part and a matching part are sequentially arranged on the outer wall of the valve port part along the axial direction away from the valve port. The outer diameter of the guiding part is smaller than the outer diameter of the matching part, and the receiving groove is in interference fit with the matching part.

[0016] In one embodiment, the difference range between the outer diameter of the matching part and the outer diameter of the guiding part is 0.03 mm - 0.06 mm.

[0017] In one embodiment, a guiding part and a tight-fitting part are sequentially arranged on the outer wall of the compression sleeve along the axial direction away from the valve port part. The outer diameter of the guiding part is smaller than the outer diameter of the tight-fitting part, and the installation groove is in interference fit with the tight-fitting part.

[0018] In one embodiment, the difference range between the outer diameter of the tight-fitting part and the outer diameter of the guiding part is 0.03 mm - 0.06 mm.

[0019] In one embodiment, a part of the tight-fitting part extends beyond the installation groove, and the range of the part extending beyond the installation groove is 0.2 mm - 0.5 mm.

[0020] In one embodiment, the valve port ring is further provided with a limiting ring opening for installing a sealing ring, and the limiting ring opening is in mating contact with the end face of the compression sleeve to abut against the sealing ring.

[0021] In one embodiment, the wire diameter of the sealing ring is greater than the depth of the limiting ring opening, and the difference range between the wire diameter and the depth of the limiting ring opening is 0.15 mm - 0.25 mm.

[0022] In one embodiment, the material of the valve port part is fiber-reinforced plastic.

[0023] The present utility model also provides an air-conditioning system, including the electronic expansion valve as described above.

[0024] The technical solution of the present utility model better fixes the sealing ring on the valve port ring by arranging a pressing sleeve in the connecting seat and axially aligning it with the limiting part in the connecting seat, and further presses the valve port ring through the pressing sleeve, so as to ensure that even when the valve port diameter increases, the sealing ring can maintain a good position and sealing performance. Compared with the related technology where the pressing sleeve is sleeved on the outer periphery of the connecting seat, occupying the peripheral space and thus affecting the wall thickness of the valve port part, for the electronic expansion valve adopting this structure, the wall thickness of the large valve port with the same diameter increases, which can prevent the sealing ring from deviating from its original position due to pressure changes or other reasons, and further avoid the problem of refrigerant leakage from the gap between the valve needle and the valve port; thereby greatly improving the strength of the valve port part and enhancing the product reliability. In addition, compared with the related technology where an additional sealing abutting part with the connecting seat needs to be provided for the valve port part to ensure the sealing effect, in this solution, the valve port part only contacts the abutting part of the connecting seat, and the structure of the valve port part is greatly simplified. After the electronic expansion valve is installed, the valve port part is only subjected to the axial pressure difference force, which will not affect the deformation of the valve port conical surface of the sealed valve port part, resulting in jamming of the first valve needle, improving the valve opening ability and increasing the reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or 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. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0026] Figure 1 It is a schematic structural diagram of an embodiment of an electronic expansion valve provided by the present utility model;

[0027] Figure 2 is Figure 1 a partial enlarged view in

[0028] Figure 3 It is a schematic structural diagram of an embodiment of a connecting seat provided by the present utility model;

[0029] Figure 4 It is a schematic structural diagram of an embodiment of a valve port part provided by the present utility model;

[0030] Figure 5 It is a schematic structural diagram of an embodiment of a pressing sleeve provided by the present utility model.

[0031] Explanation of the reference numerals in the drawings:

[0032] 100, the first valve needle;

[0033] 200, the valve port assembly;

[0034] 210. Connecting seat; 211. Limiting part; 212. Connecting part; 213. Inner cavity; 214. Flow hole; 215. Flow guiding inclined surface; 216. Installation groove; 217. Accommodating groove;

[0035] 220. Valve port ring; 221. Valve port; 222. Conical surface; 223. Guiding part; 224. Fitting part; 225. Limiting ring port;

[0036] 230. Compression sleeve; 231. Guiding part; 232. Tightly fitting part;

[0037] 300. Second valve needle.

[0038] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the accompanying drawings in conjunction with the embodiments. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to 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.

[0040] 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.

[0041] 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 various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. 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.

[0042] In refrigeration systems, electronic expansion valves are used to regulate and control the flow of refrigerant into the evaporator. With technological advancements, electronic expansion valves are increasingly being used in automotive air conditioning systems, heat pump air conditioning systems, and battery cooling systems. In related technologies, the valve port of the valve member in the connector is sealed against the inner wall of the valve needle. A compression sleeve is placed over the connector to compress the valve member. To prevent internal leakage, a sealing ring is placed on the inside of the valve member to ensure a good seal. However, as the diameter of the valve port increases, the valve member's positional limit on the sealing ring can easily fail, causing the sealing ring to burst out, resulting in a loose seal between the valve needle and the valve port, and the possibility of internal leakage.

[0043] The utility model provides an electronic expansion valve, which solves the problem of sealing ring coming out and internal leakage caused by insufficient position restriction of the sealing ring by the valve orifice under the condition of a large-diameter valve orifice of the electronic expansion valve.

[0044] In one embodiment of the present invention, please refer to Figures 1 to 5 The electronic expansion valve includes a first valve needle 100 and a valve port assembly 200. The connecting seat 210 includes a limiting portion 211, a connecting portion 212 located below the limiting portion 211, and a hollow inner cavity 213. The valve port ring 220 is disposed in the inner cavity 213 and abuts against the limiting portion 211. The pressing sleeve 230 is connected to the connecting portion 212 and axially presses the valve port ring 220 against the limiting portion 211. The valve port ring 220 is provided with a valve port 221 communicating with the inner cavity 213. The first valve needle 100 is movably disposed on the connecting seat 210 to open and close the flow path connecting the connecting seat 210 and the valve port 221.

[0045] In one embodiment, the valve mouth ring 220 and the pressing sleeve 230 are sequentially arranged in the inner cavity 213, the limiting portion 211 and the pressing sleeve 230 axially press the valve mouth ring 220, and the valve mouth ring 220 is provided with a valve port 221 connected to the inner cavity 213; in another embodiment, the pressing sleeve 230 is outermostly arranged on the connecting portion 212, and the connecting portion 212 is located below the valve mouth ring 220. The pressing sleeve 230 will not overlap with the connecting seat 210, and under the valve port 221 of the same caliber, the wall thickness of the valve mouth ring 220 is increased.

[0046] The conventional double-valve needle electronic expansion valve has a complex bottom structure of the connecting seat 210 and the pressing sleeve 230, and requires high processing precision, resulting in high processing and manufacturing costs; the pressing sleeve 230 is sleeved on the outer wall of the connecting seat 210, occupying radial space, resulting in a thin wall thickness of the valve port 221. When the diameter of the valve port 221 is expanded, especially when it is expanded to a large-diameter electronic expansion valve of more than 14 mm, because the valve port 221 is made of plastic, the diameter of the valve port 221 increases, resulting in a significant decrease in the strength of the valve port 221. Under the impact of high pressure, the limit of the sealing ring used for the pressure of the valve port 221 is easily failed, causing the sealing ring to burst out, affecting internal leakage and causing a decrease in system energy efficiency; in addition, after the diameter of the valve port 221 is increased, the strength of the valve port 221 is reduced, and under the action of the high pressure difference, it is easy to cause the sealing cone 222 of the valve port 221 to deform radially, locking the first valve needle 100, causing the first valve needle 100 to be unable to open and the system to fail to operate normally.

[0047] The technical solution of the present invention is to better fix the sealing ring on the valve ring 220 by setting the compression sleeve 230 in the connection seat 210, axially and in contact with the limiting portion 211 in the connection seat 210, and further compress the valve ring 220 by the compression sleeve 230, thereby ensuring that the sealing ring can maintain a good position and sealing performance even when the diameter of the valve port 221 increases. Compared with the related art where the compression sleeve 230 is arranged outside the periphery of the connection seat 210, occupying the peripheral space and thus affecting the wall thickness of the valve port 221, the electronic expansion valve using this structure has a larger wall thickness of the valve port 221 of the same diameter, which can prevent the sealing ring from being displaced from its original position due to pressure changes or other reasons, thereby avoiding the problem of refrigerant leakage from the gap between the valve needle and the valve port 221; thereby significantly improving the strength of the valve port 221 and enhancing product reliability. In addition, compared with the related art, in order to ensure the sealing effect, the valve port 221 needs to be additionally provided with a sealing abutment portion with the connecting seat 210. In this solution, the valve port 221 is only in contact with the abutment portion of the connecting seat 210, and the structure of the valve port 221 is greatly simplified. After the electronic expansion valve is installed, the valve port 221 is only subjected to axial pressure differential force, which will not affect the deformation of the valve port 221 cone surface 222 of the sealing valve port 221, resulting in the first valve needle 100 being stuck, thereby improving the valve opening ability and increasing reliability.

[0048] Specifically, the middle portion of the limiting portion 211 defines a flow hole 214, the inner diameter of which is equal to or greater than the inner diameter of the valve port 221. The limiting portion 211 is annularly disposed on the inner wall of the inner cavity 213, axially abutting at least a portion of the upper end surface of the valve port ring 220 to compress the valve port 221. A fluid passage is provided above the limiting portion 211. To ensure that the fluid entering the valve port 221 through the passage is not affected, the inner diameter of the flow hole 214 is equal to or greater than the inner diameter of the valve port 221.

[0049] See alsoFigure 1 and Figure 2 Further, in order not to affect the flow rate of the fluid entering the valve port 221, the valve port 221 is provided with a conical surface 222 in the axial direction away from the first valve needle 100, and the diameter of the flow hole 214 is greater than or equal to the maximum diameter of the valve port 221. On the one hand, the design of the conical surface 222 can provide a more stable contact surface, so that when the first valve needle 100 approaches or contacts the valve port 221, a better sealing effect can be formed. The conical design helps to open and close the flow channel faster, because the conical surface can achieve complete closure or opening within a shorter distance.

[0050] Specifically, the range of the angle formed by the conical surface 222 and the axial direction is 40° - 120°. Within this angle range, when the conical surface 222 contacts the valve needle, it can provide sufficient contact area to ensure good sealing performance. Too small an angle may result in insufficient contact area and poor sealing effect; too large an angle may result in overly sharp contact, affecting the stability and durability of the seal. In manufacturing, too steep an angle may be difficult to machine precisely, while too gentle an angle may not achieve the expected effect during actual use. Therefore, choosing the angle range between 40° and 120° is also considered based on processing feasibility.

[0051] To optimize the hydrodynamic characteristics and improve the fluidity and efficiency of the fluid passing through the valve port 221, the flow hole 214 is provided with a guiding inclined surface 215 in the axial direction away from the first valve needle 100. The design of the guiding inclined surface 215 helps to guide the fluid to pass through the flow hole 214 more smoothly, reduce the eddy current and resistance formed when the fluid turns, thereby improving the efficiency of the system. By optimizing the fluid path, the guiding inclined surface 215 can reduce the cavitation phenomenon generated when the fluid passes at high speed. This phenomenon will cause energy loss and may damage system components. For application scenarios that require quick response, such as automotive air conditioning systems, the guiding inclined surface 215 can accelerate the fluid passing speed and improve the response speed of the valve.

[0052] Specifically, the range of the angle formed by the guiding inclined surface 215 and the radial direction ≥ 120°. When the angle between the guiding inclined surface 215 and the radial direction is large, it can better guide the fluid to flow outward along the inclined surface, reduce the collision and turbulence of the fluid, thereby reducing energy loss. A larger angle can ensure that the fluid spreads outward smoothly along the inclined surface instead of making a sudden turn in the vertical direction, which helps to improve the smoothness and efficiency of fluid flow. From the perspective of manufacturing process, a larger angle (such as ≥ 120°) is usually easier to machine than an acute angle. A larger angle is easier to achieve in machining and can reduce errors in the production process.

[0053] Please refer to Figure 1 and Figure 2, Further, to ensure the axial pressing effect, the contact portion of the limiting portion 211 with the ring width of the valve port ring 220 is greater than or equal to 2 / 3 of the width of the ring width. In this way, by ensuring that the limiting portion 211 and the valve port ring 220 have sufficient contact area, when the valve port ring 220 is subjected to a pressing force, the pressure can be evenly distributed on the entire contact surface, thereby improving the sealing stability. If the contact area is too small, it may lead to too high local pressure and affect the sealing effect. A larger contact area can effectively reduce the deformation or displacement of the sealing ring caused by uneven local pressure, thereby reducing the risk of internal leakage. When the limiting portion 211 is in full contact with the valve port ring 220, the sealing ring is less likely to be extruded or displaced.

[0054] Please refer to Figure 3 , Further, an installation groove 216 for installing the pressing sleeve 230 is provided on the inner wall of the inner cavity 213. The diameter of the installation groove 216 is larger than the diameter of the inner cavity 213 to ensure the axial pressing effect, and the diameter of the installation groove 216 is larger than the diameter of the inner cavity 213, which facilitates the installation and disassembly of the pressing sleeve 230. The larger diameter of the installation groove 216 makes it easier for the pressing sleeve 230 to align its position and will not be stuck due to size limitations during installation or disassembly.

[0055] Please refer to Figure 5 , Specifically, a guiding portion 231 and a tight-fitting portion 232 are sequentially provided on the outer wall of the pressing sleeve 230 along the axial direction away from the valve port 221. The outer diameter of the guiding portion 231 is smaller than the outer diameter of the tight-fitting portion 232, and the installation groove 216 is in interference fit with the tight-fitting portion 232. The small outer diameter of the guiding portion 231 can help the pressing sleeve 230 to more easily align with the position of the installation groove 216 during installation, thereby ensuring that the pressing sleeve 230 can be accurately installed in place. The guiding portion 231 plays a guiding role, enabling the pressing sleeve 230 to smoothly enter the installation groove 216. Since the outer diameter of the guiding portion 231 is smaller than that of the tight-fitting portion 232, such a design makes it easier for the pressing sleeve 230 to enter the installation groove 216 during installation, reducing the installation difficulty and improving the assembly efficiency. The interference fit between the tight-fitting portion 232 and the installation groove 216 can ensure that the pressing sleeve 230 will not easily move or loosen after installation, thereby improving the connection stability between the pressing sleeve 230 and the installation groove 216. Interference fit means that the size of the tight-fitting portion 232 is slightly larger than the size of the installation groove 216, and through extrusion installation, a tight fit is ensured.

[0056] Furthermore, continuous laser welding at the welding joint easily causes deformation of the valve head gasket, affecting internal leakage. Riveting the connecting seat 210 and the bushing 230 enables the bushing 230 to be stably assembled on the connecting seat 210. The connecting seat 210 and the housing are in sealed connection. Since it belongs to cold working, the process operation is simple. Reliable connection can be achieved through one-time press-fitting riveting, with less consumption of energy and resources. Moreover, the connection strength of riveting is superior to that of laser welding. Such a setting can reduce certain production costs 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 conducive to environmental protection.

[0057] Please refer to Figure 4 , specifically, a guiding portion 223 and a mating portion 224 are successively provided on the outer wall of the valve port 221 member along the axial direction away from the valve port 221. The outer diameter of the guiding portion 223 is smaller than that of the mating portion 224, and the receiving groove 217 is in interference fit with the mating portion 224. The difference range between the outer diameter of the mating portion 224 and the outer diameter of the guiding portion 223 is 0.03 mm - 0.06 mm. Since the outer diameter of the guiding portion 223 is smaller than that of the mating portion 224, such a design makes it easier for the bushing 230 to enter the installation groove 216 during installation. The guiding portion 223 can play a guiding role, enabling the bushing 230 to be smoothly aligned with the installation groove 216. The smaller difference (0.03 mm - 0.06 mm) can help the bushing 230 to more easily align with the position of the installation groove 216 during installation, ensuring that the bushing 230 can be accurately installed in place.

[0058] Furthermore, the limiting portion 211 and the installation groove 216 define a receiving groove 217 for installing the valve port 221 member on the inner wall. A part of the valve port 221 member extends beyond the installation groove 216, and the length range of the part extending beyond the receiving groove 217 is 0.03 mm - 0.12 mm. The valve port 221 member only undergoes axial compression under the pressing of the bushing 230 and the abutting portion. Within the range of 0.03 mm - 0.12 mm, not only can the sealing requirement be met, but the valve port 221 member is only subjected to the axial pressure difference force, without affecting the deformation of the valve port 221 conical surface 222 of the sealed valve port 221 member, resulting in jamming of the first valve needle 100, improving the valve opening ability and increasing the reliability.

[0059] Furthermore, a guiding portion 231 and a tight-fitting portion 232 are successively provided on the outer wall of the bushing 230 along the axial direction away from the valve port 221 member. The outer diameter of the guiding portion 231 is smaller than that of the tight-fitting portion 232, and the installation groove 216 is in interference fit with the tight-fitting portion 232.

[0060] Specifically, the difference range between the outer diameter of the tight-fitting portion 232 and the outer diameter of the guiding portion 231 is 0.03 mm - 0.06 mm.

[0061] To facilitate subsequent welding and minimize thermal deformation, a part of the tight-fitting portion 232 extends beyond the installation groove 216, and the range of the part extending beyond the installation groove 216 is 0.2 mm - 0.5 mm. Pulse laser welding is used at the welding location, resulting in little thermal deformation.

[0062] Furthermore, to enhance the limitation of the sealing ring by the valve port ring 220, the valve port ring 220 is also provided with a limiting ring opening 225 for installing the sealing ring, and the limiting ring opening 225 cooperates with the end face of the gland 230 to abut against the sealing ring.

[0063] Specifically, the wire diameter of the sealing ring is greater than the depth of the limiting ring opening 225, and the difference range between the wire diameter and the depth of the limiting ring opening 225 is 0.15 mm - 0.25 mm. By setting the wire diameter of the sealing ring to be greater than the depth of the limiting ring opening 225 and the difference being between 0.15 mm and 0.25 mm, it can ensure that the sealing ring has a certain amount of compression in the installed state, thereby enhancing the stability of the sealing ring within the valve port ring 220. Such a design can prevent the sealing ring from slipping out or shifting under high-pressure or vibration environments. The difference range between the wire diameter and the depth of the limiting ring opening 225 is set to 0.15 mm to 0.25 mm, which can ensure that the sealing ring is neither over-extruded nor loose when inserted into the limiting ring opening 225, thus achieving the best insertion state.

[0064] Specifically, the material of the valve port 221 part is fiber-reinforced plastic, which can improve the structural strength of the valve port 221 part. Compared with the valve port 221 part made of plastic material, when the diameter increases, it can ensure the structural strength of the valve port 221 part and avoid the failure of the limitation of the sealing ring under the impact of high pressure, resulting in the sealing ring being ejected and affecting internal leakage.

[0065] 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 limit rod, and a stator coil. The nut assembly is fixedly welded to the connecting seat 210, and the connecting seat 210 is fixedly welded 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. 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 limit 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 limit sleeve is fixedly connected to the lead screw, and the second valve needle 300 is riveted and fixedly connected to the bearing. The bearing and the second valve needle 300 are located at the outermost distal 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, and the spring can be further compressed to increase the pressure on the valve needle so that the second valve needle 300 is more tightly sealed with the valve port 221, and at the same time, the bearing limit sleeve can be driven to disengage from the abutment with the bearing. A rubber seal or a combined rubber and plastic seal is arranged between the second valve needle 300 and the inner cavity 213 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 213 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 221. In the closed valve state: under the action of the return spring, the first valve needle 100 abuts against and seals the valve port 221. At this time, the second valve needle 300 also abuts against and seals the first valve needle 100.

[0066] The present utility model also provides an air conditioning system, which includes an electronic expansion valve. The specific structure of the electronic expansion valve refers to the above embodiments. Since this electronic expansion valve adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. 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.

[0067] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. All equivalent structural transformations 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 direct / indirect applications in other related technical fields are included in the patent protection scope of the present utility model.

Claims

1. An electronic expansion valve, characterized in that, Comprising: A first valve needle; And A valve port assembly, including a connection seat, a valve port ring and a compression sleeve. The connection seat includes a limiting portion, a connection portion located below the limiting portion, and a hollow inner cavity. The valve port ring is disposed in the inner cavity and abuts against the limiting portion. The compression sleeve is connected to the connection portion and axially presses the valve port ring against the limiting portion. The valve port ring is provided with a valve port communicating with the inner cavity. The first valve needle is movably disposed in the connection seat to open and close the flow path communicating the connection seat with the valve port.

2. The electronic expansion valve according to claim 1, wherein The valve port ring and the compression sleeve are sequentially disposed in the inner cavity, and the limiting portion and the compression sleeve axially press the valve port ring.

3. The electronic expansion valve according to claim 1, wherein, A through hole is defined in the middle of the limiting portion. The valve port is provided as a conical surface in the axial direction away from the first valve needle. The diameter of the through hole is greater than or equal to the maximum diameter of the valve port.

4. The electronic expansion valve according to claim 3, wherein The range of the angle formed by the conical surface and the axial direction is 40° - 120°.

5. The electronic expansion valve according to claim 3, wherein, The through hole is provided as a guiding inclined surface in the axial direction away from the first valve needle.

6. The electronic expansion valve according to claim 5, characterized in that, The range of the angle formed by the guiding inclined surface and the radial direction is ≥120°.

7. The electronic expansion valve according to claim 1, characterized in that The width of the contact portion of the limiting portion with the ring width of the valve port ring is greater than or equal to 2 / 3 of the width of the ring width.

8. The electronic expansion valve according to claim 1, characterized in that, The connection portion and the inner wall of the inner cavity define an installation groove for installing the compression sleeve, and the diameter of the installation groove is greater than the diameter of the inner cavity.

9. The electronic expansion valve according to claim 8, characterized in that The limiting portion and the installation groove define a receiving groove for installing the valve port member on the inner wall. A part of the valve port member extends beyond the installation groove, and the length range of the part extending beyond the receiving groove is 0.03 mm - 0.12 mm.

10. The electronic expansion valve according to claim 9, wherein, The outer wall of the valve port member is sequentially provided with a guiding portion and a mating portion in the axial direction away from the valve port. The outer diameter of the guiding portion is smaller than the outer diameter of the mating portion, and the receiving groove is in interference fit with the mating portion.

11. The electronic expansion valve according to claim 10, characterized in that, The difference range between the outer diameter of the mating portion and the outer diameter of the guiding portion is 0.03 mm - 0.06 mm.

12. The electronic expansion valve according to claim 8, characterized in that, The outer wall of the compression sleeve is sequentially provided with a guiding portion and a tight-fitting portion in the axial direction away from the valve port member. The outer diameter of the guiding portion is smaller than the outer diameter of the tight-fitting portion, and the installation groove is in interference fit with the tight-fitting portion.

13. The electronic expansion valve according to claim 12, characterized in that, The difference range between the outer diameter of the tight-fitting portion and the outer diameter of the guiding portion is 0.03 mm - 0.06 mm; and / or, a part of the tight-fitting portion extends beyond the installation groove, and the range of the part extending beyond the installation groove is 0.2 mm - 0.5 mm.

14. The electronic expansion valve according to claim 1, wherein, The valve port ring is further provided with a limiting ring opening for installing a sealing ring, and the limiting ring opening cooperates with the end face of the compression sleeve to abut against the sealing ring.

15. The electronic expansion valve according to claim 14, characterized in that, The wire diameter of the sealing ring is greater than the depth of the limiting ring opening, and the difference range between the wire diameter and the depth of the limiting ring opening is 0.15 mm - 0.25 mm.

16. The electronic expansion valve according to claim 1, wherein, The valve port member is made of fiber-reinforced plastic.

17. An air-conditioning system, characterized in that, Including the electronic expansion valve according to any one of claims 1 to 16.

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