Electronic expansion valve, air conditioning system and vehicle
By setting a balance channel on the first valve needle of the electronic expansion valve, the problems of complex setting and large flow resistance of the traditional internal balance channel are solved, and the effects of simplification of structure, reduced flow resistance and reduced manufacturing cost are achieved.
Patent Information
- Application Number
- CN202422062145.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The internal balance channel of traditional electronic expansion valves is complex, with large flow resistance and high processing difficulty, resulting in high manufacturing costs.
A balance channel is provided on the first valve needle of the electronic expansion valve, and the balance channel connects the guide hole and the first valve port, simplifying the structure of the internal balance channel and reducing processing costs.
The structure of the internal balance channel is simplified, flow resistance and processing difficulty are reduced, balance capacity is improved, and the manufacturing cost of electronic expansion valves is reduced.
Smart Images
Figure CN223036661U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valves, and in particular to an electronic expansion valve, an air conditioning system and a vehicle. Background Art
[0002] In order to ensure the smooth operation of the traditional double-valve needle electronic expansion valve, an internal balancing channel needs to be set to balance the pressure difference on both sides of the valve needle. However, the existing internal balancing channel is relatively complicated, and it is usually necessary to open interconnected channels on multiple components to form a complete internal balancing path. For example, a balancing hole is set between the valve body and the first valve needle, and the gasket, compression sleeve and other components between the first valve needle and the second valve needle are provided with notches to connect these balancing holes to form an internal balancing channel. In this structural form, the flow resistance of the internal balancing channel is large, and the processing is difficult, resulting in high manufacturing costs. Utility Model Content
[0003] The main purpose of the utility model is to provide an electronic expansion valve, an air conditioning system and a vehicle, aiming to simplify the structure of a balance channel in the electronic expansion valve and reduce the manufacturing cost of the electronic expansion valve.
[0004] In order to achieve the above-mentioned purpose, the utility model proposes an electronic expansion valve, comprising:
[0005] A valve body, provided with a valve cavity and a first valve port communicating with the valve cavity, and the valve body is also provided with a guide hole;
[0006] a first valve needle installed in the guide hole and moving under the guidance of the guide hole to open or close the first valve port, the first valve needle also having a second valve port communicating with the first valve port and the valve cavity;
[0007] a second valve needle movably disposed in the first valve needle to open or close the second valve port, wherein the diameter of the second valve needle is smaller than the diameter of the first valve needle; and
[0008] A balancing channel is provided on the first valve needle, and the balancing channel communicates with the guide hole and the first valve port.
[0009] In one embodiment, the balancing channel is configured as a balancing hole, and the axis of the balancing hole is arranged parallel to the axis of the first valve needle.
[0010] In one embodiment, a plurality of the balancing holes are provided, and the plurality of the balancing holes are arranged at intervals on the first valve needle.
[0011] In one embodiment, the plurality of balancing holes are arranged in a circular array around the axis of the first valve needle.
[0012] In one embodiment, the balancing hole is a circular hole.
[0013] In one embodiment, the diameter of the balance hole is not less than 0.8 mm.
[0014] In one embodiment, the diameter of the first valve port is A, where 10 mm < A ≤ 16 mm.
[0015] In one embodiment, the moving stroke of the first valve needle is less than 2.5 mm; and / or, the moving stroke of the second valve needle is greater than 1.5 mm.
[0016] In one embodiment, the diameter of the first valve needle is B, where B ≥ A + 0.5 mm.
[0017] The present utility model also provides an air conditioning system, including the electronic expansion valve described above.
[0018] The present utility model also provides a vehicle, including the air conditioning system described above.
[0019] In the technical solution of the present utility model, the electronic expansion valve has a valve body, a valve chamber is provided on the valve body and a first valve port communicating with the valve chamber, a guiding hole is also provided on the valve body, a first valve needle is installed in the guiding hole, and the first valve needle slides under the guidance of the guiding hole to open or close the first valve port, so as to realize the regulation of the electronic expansion valve in the large flow rate stage; in addition, a second valve port communicating the first valve port with the valve chamber is provided in the first valve needle, a second valve needle is movably arranged in the first valve needle, the diameter of the second valve needle is smaller than that of the first valve needle, and the second valve needle opens or closes the second valve port through movement, so as to realize the regulation of the electronic expansion valve in the small flow rate stage; in order to balance the pressure of opening and closing of the electronic expansion valve, a balance channel is further provided on the first valve needle, the balance channel communicates the guiding hole with the first valve port, when the first valve needle opens or closes or the second valve needle opens or closes, the fluid can flow between the guiding hole and the first valve port through the balance channel, so as to balance the pressure difference between the guiding hole and the first valve port, thereby ensuring the smooth opening and closing of the first valve needle and the second valve needle; in this solution, the balance channel is only provided on the first valve needle, so that the processing difficulty of the internal balance channel can be simplified, the processing cost can be reduced, and since the fluid only flows on the first valve needle, its flow path can be more direct and continuous, reducing the possibility of fluid turning, changing direction or passing through the connection part, which is beneficial to reducing the flow resistance, thereby improving the balance ability of the balance channel. Description of the Drawings
[0020] 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.
[0021] Figure 1 The sectional structure schematic diagram of the electronic expansion valve provided by the present utility model;
[0022] Figure 2 The structure schematic diagram of the valve body in the electronic expansion valve provided by the present utility model;
[0023] Figure 3 The structure schematic diagram of the first valve needle in the electronic expansion valve provided by the present utility model;
[0024] Figure 4 The sectional structure schematic diagram of the first valve needle in the electronic expansion valve provided by the present utility model.
[0025] Explanation of the reference numerals in the attached drawings:
[0026] 10. Compression sleeve; 20. Sealing gasket; 30. Return spring; 40. Support spring; 50. Nut; 60. Rotor; 70. Lead screw; 100. Valve body; 110. Valve cavity; 120. First valve port; 130. Guide hole; 200. First valve needle; 210. Second valve port; 300. Second valve needle; 400. Balance channel.
[0027] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the attached drawings. Specific embodiments
[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the attached 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0029] 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.
[0030] In addition, if the embodiments of the present utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between 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 results in contradictions 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.
[0031] In order to ensure the smooth operation of the valve, the traditional double-valve-needle electronic expansion valve needs to set up an internal balance channel to balance the pressure difference on both sides of the valve needle. However, the existing internal balance channel is relatively complex in setting. Usually, it is necessary to open interconnected channels on multiple components to form a complete internal balance path. In this structural form, the flow resistance of the internal balance channel is large, and the processing difficulty is high, resulting in a relatively high manufacturing cost of the electronic expansion valve.
[0032] Therefore, this technical solution proposes an electronic expansion valve, including:
[0033] A valve body 100, provided with a valve cavity 110 and a first valve port 120 communicating with the valve cavity 110. The valve body 100 is further provided with a guiding hole 130;
[0034] A first valve needle 200, installed in the guiding hole 130 and moving under the guidance of the guiding hole 130 to open or close the first valve port 120. The first valve needle 200 is further provided with a second valve port 210 communicating the first valve port 120 with the valve cavity 110;
[0035] A second valve needle 300, movably arranged inside the first valve needle 200 to open or close the second valve port 210. The diameter of the second valve needle 300 is smaller than that of the first valve needle 200; and
[0036] A balance channel 400, arranged on the first valve needle 200. The balance channel 400 communicates the guiding hole 130 with the first valve port 120.
[0037] In the technical solution of the present utility model, the electronic expansion valve has a valve body 100, a valve cavity 110 is provided on the valve body 100, and a first valve port 120 communicated with the valve cavity 110 is provided. A guiding hole 130 is also provided on the valve body 100. A first valve needle 200 is installed in the guiding hole 130. The first valve needle 200 slides under the guidance of the guiding hole 130 to open or close the first valve port 120, so as to realize the regulation of the electronic expansion valve in the large flow stage. In addition, a second valve port 210 communicating the first valve port 120 with the valve cavity 110 is provided in the first valve needle 200. A second valve needle 300 is movably provided in the first valve needle 200. The diameter of the second valve needle 300 is smaller than that of the first valve needle 200. The second valve needle 300 opens or closes the second valve port 210 by moving, so as to realize the regulation of the electronic expansion valve in the small flow stage. In order to balance the pressure for opening and closing the electronic expansion valve, a balance channel 400 is further provided on the first valve needle 200. The balance channel 400 communicates the guiding hole 130 with the first valve port 120. When the first valve needle 200 opens or closes or the second valve needle 300 opens or closes, the fluid can flow between the guiding hole 130 and the first valve port 120 through the balance channel 400, so as to balance the pressure difference between the guiding hole 130 and the first valve port 120, thereby ensuring the smooth opening and closing of the first valve needle 200 and the second valve needle 300. In this solution, the balance channel 400 is only provided on the first valve needle 200, so that the processing difficulty of the internal balance channel 400 can be simplified, the processing cost can be reduced, and since the fluid only flows on the first valve needle 200, its flow path can be more direct and continuous, reducing the possibility of the fluid turning, changing direction or passing through the connection, which is beneficial to reducing the flow resistance, thereby improving the balance ability of the balance channel 400.
[0038] Specifically, as Figures 1 to 4, in an embodiment of the present utility model, the electronic expansion valve is of a double-needle valve structure. The electronic expansion valve includes a valve body 100, and the valve body 100 is the main structure of the electronic expansion valve. A first valve port 120 is provided at the bottom end of the valve body 100. A valve cavity 110 is provided inside the valve body 100. An opening communicating with the valve cavity 110 is provided on the outer side wall of the valve body 100. In addition, the first valve port 120 communicates with the valve cavity 110, and fluid can flow between the valve body 100 and the valve cavity 110. In addition, a gland 10 is provided at the first valve port 120. The gland 10 is provided with an opening coaxial with and of the same size as the first valve port 120. The gland 10 is used to be inserted into the interface of the pipeline to connect the first valve port 120 and the valve cavity 110 to the pipeline. In addition, an annular groove is provided on the outer side wall of the gland 10 for placing a sealing ring. The sealing ring can fill the gap between the gland 10 and the interface when the gland 10 is inserted, improving the sealing performance of the connection. In addition, a guiding hole 130 is also provided inside the valve body 100. The guiding hole 130 and the first valve port 120 are respectively arranged on opposite sides of the valve cavity 110, and the guiding hole 130 extends toward the side of the first valve port 120. For the convenience of processing, the guiding hole 130 can be a circular hole. The electronic expansion valve further includes a first valve needle 200. The first valve needle 200 is integrally cylindrical. One end of the first valve needle 200 is installed in the guiding hole 130 and is in sliding fit with the guiding hole 130. Under the guiding action of the guiding hole 130, the first valve needle 200 can move closer to or away from the first valve port 120. The diameter of the first valve needle 200 can be larger than the diameter of the first valve port 120. When the electronic expansion valve is closed, the first valve needle 200 slides closer to the first valve port 120 and abuts against the periphery of the first valve port 120, thus blocking the first valve port 120, and fluid will not enter the valve cavity 110 from the first valve port 120. To ensure the tightness of the closure of the first valve port 120, a sealing gasket 20 is also provided at the first valve port 120. The sealing gasket 20 is annularly arranged. An opening coaxial with the first valve port 120 is provided at the center of the sealing gasket 20. The sealing gasket 20 is made of a flexible material. The sealing gasket 20 can be clamped and fixed by the cooperation of the gland 10 and the valve body 100. When the first valve port 120 is closed, the first valve needle 200 can abut against the sealing gasket 20, and the sealing gasket 20 undergoes elastic deformation. The contact area between the sealing gasket 20 and the first valve needle 200 increases and becomes more fitting, and the first valve needle 200 and the sealing gasket 20 are tightly abutted for sealing. In addition, a conical surface can be provided at the periphery of the opening of the sealing gasket 20, and the edge of the first valve needle 200 can abut against the conical surface. In this structural form, after the sealing gasket 20 deforms, it will cover the edge of the first valve needle 200, so as to further improve the reliability of the closure of the first valve port 120.In addition, the electronic expansion valve further includes a second valve needle 300, the diameter of the second valve needle 300 can be smaller than that of the first valve needle 200. An installation hole extending along the axis of the first valve needle 200 is provided on the first valve needle 200. In addition, a second valve port 210 is provided at one end of the first valve needle 200 close to the first valve port 120. One end of the second valve port 210 extends to the bottom end of the first valve needle 200 and communicates with the first valve port 120, and the other end of the second valve port 210 extends to the side wall of the first valve needle 200 and communicates with the valve cavity 110. Fluid can flow between the first valve port 120 and the valve cavity 110 through the second valve port 210. One end of the installation hole extends away from the first valve port 120 and penetrates through the top of the first valve needle 200 to communicate with the guiding hole 130, and the other end of the installation hole extends toward the first valve port 120 side and penetrates to the second valve port 210. The second valve needle 300 is slidably arranged in the guiding hole 130. By sliding, the second valve needle 300 can extend into the second valve port 210 and adjust the opening degree of the second valve port 210. Thus, the electronic expansion valve has two adjustment stages of small flow rate and large flow rate. In the small flow rate stage, the opening degree of the second valve port 210 can be adjusted by sliding the second valve needle 300 to achieve fine adjustment of the fluid. In the large flow rate stage, the first valve needle 200 slides to open and close the first valve port 120, so that the fluid can be adjusted in a large range.
[0039] The opening and closing modes of the first valve needle 200 and the second valve needle 300 will be described in detail below, as Figure 1, a return spring 30 is arranged in the guiding hole 130 of the valve body 100. One end of the return spring 30 abuts against the inner wall of the guiding hole 130, and the other end abuts against one end of the first valve needle 200 far away from the first valve port 120. Driven by the return spring 30, when the first valve needle 200 is not subject to external force, the first valve needle 200 will closely abut against the first valve port 120 to keep the first valve port 120 normally closed. In addition, a nut 50 is welded and fixed outside the valve body 100. The nut 50 is arranged at one end of the valve body 100 far away from the first valve port 120. The nut 50 is provided with a threaded hole coaxial with the mounting hole on the first valve needle 200. A lead screw 70 is threadedly connected in the threaded hole. One end of the lead screw 70 extends into the guiding hole 130. A support spring 40 is sleeved on the end of the lead screw 70 extending into the guiding hole 130. One end of the support spring 40 is fixed to the lead screw 70, and the other end abuts against the second valve needle 300. Driven by the support spring 40, the second valve needle 300 will extend into the second valve port 210 to make the second valve port 210 normally closed. Thus, when not subject to external force, both the second valve port 210 and the first valve port 120 are closed, and the electronic expansion valve is in a normally closed state. In order to drive the first valve needle 200 and the second valve needle 300 to move, the lead screw 70 is connected with a rotor 60. By sleeving a stator outside the rotor 60 and applying a pulse to the stator, the rotor 60 can be driven to drive the lead screw 70 to rotate. Since the lead screw 70 is screwed with the nut 50 and the position of the nut 50 is fixed, the lead screw 70 will move along its own axis direction. In addition, one end of the lead screw 70 sleeved with the support spring 40 can movably penetrate into the second valve needle 300, and the movement of the lead screw 70 relative to the second valve needle 300 within a certain stroke is restricted by a limiting structure. Limiting protrusions and other structures are also arranged in the mounting hole. A groove matched with the limiting protrusion is arranged on the outer side wall of the second valve needle 300, so that the second valve needle 300 can only slide between the position of completely closing the second valve port 210 and the position of completely opening the second valve port 210.
[0040] The working process of the electronic expansion valve will be described below. When it is necessary to open the electronic expansion valve, a pulse with a certain pattern is applied to the stator to drive the rotor 60 to drive the lead screw 70 to rotate. The lead screw 70 rotates within the nut 50 and moves away from the first valve port 120. Under the limitation of the limiting structure, the lead screw 70 can drive the second valve needle 300 to open the second valve port 210. By adjusting the number of pulses, the position of the second valve needle 300 can be adjusted, and then the flow rate of the second valve port 210 can be adjusted to achieve fine adjustment of small flow rates. After the second valve needle 300 fully opens the second valve port 210, when an electric pulse is continuously applied to the electronic device, the rotor 60 will continue to rotate and drive the lead screw 70 to move away from the first valve port 120. At this time, under the action of the limiting structure between the second valve needle 300 and the first valve needle 200, the second valve needle 300 can drive the first valve needle 200 to move away from the first valve port 120. At this time, the first valve port 120 opens, and the return spring 30 will be compressed and store energy. By adjusting the position of the first valve needle 200 and the first valve port 120, the flow rate of the fluid in the large flow rate stage can be adjusted. When the electronic expansion valve needs to be closed, only a reverse pulse needs to be applied to the stator to drive the lead screw 70 to move towards the first valve port 120. The first valve needle 200 will close the first valve port 120 under the action of the return spring 30, and the second valve needle 300 will close the second valve port 210 under the action of the support spring 40.
[0041] During the opening and closing process of the first valve needle 200 and the second valve needle 300, if there is a pressure difference between the guide hole 130 and the first valve port 120, it will form a resistance to the opening and closing of the first valve needle 200 and the second valve needle 300, affecting the stability and response speed of the movement of the first valve needle 200 and the second valve needle 300. The traditional method is to set interconnected channels on the two valve needles and the valve body 100, so that the fluid can flow through the channels into the guide hole 130 or the installation hole when the two valve needles open and close, so as to balance the pressure difference. Such a channel structure often needs to turn and change direction, increasing the flow resistance, which has an adverse effect on balancing the pressure difference, and this kind of channel structure is complex and difficult to process. Therefore, as Figure 1 、 Figure 3 and Figure 4, in an embodiment of the present utility model, a balance channel 400 is provided on the first valve needle 200. The balance channel 400 extends from the top end to the bottom end of the first valve needle 200, and both ends of the balance channel 400 communicate with the first valve port 120 and the guide hole 130 respectively. When the second valve needle 300 is opened and closed, the fluid can flow through the path of the first valve port 120 - the balance channel 400 - the guide hole 130 - the mounting hole, so as to balance the pressure difference between the mounting hole and the first valve port 120 and ensure the smooth opening and closing of the second valve needle 300. When the first valve needle 200 is opened and closed, the fluid can flow through the path of the first valve port 120 - the balance channel 400 - the guide hole 130, so as to balance the pressure difference between the guide hole 130 and the first valve port 120 and ensure the smooth opening and closing of the first valve needle 200. In this embodiment, since the balance channel 400 is only provided on the first valve needle 200, the fluid can flow directly in a well-designed flow channel. Since there is no interface between components, the additional resistance caused by the connection is also reduced. In this way, the flow resistance can be reduced, thereby improving the smoothness and response speed of the opening and closing of the first valve needle 200 and the second valve needle 300. In addition, no other components except the first valve needle 200 need to be provided with channels for the fluid to pass through, which can simplify the complexity of the structure and thus reduce the manufacturing cost of the electronic expansion valve.
[0042] As Figure 1 and Figure 4 , in an embodiment of the present utility model, the balance channel 400 is configured as a balance hole, and the axis of the balance hole is arranged parallel to the axis of the first valve needle 200. The balance hole penetrates through the top and bottom of the first valve needle 200, and the axis of the balance hole is arranged parallel to the axis of the first valve needle 200, that is, the balance hole extends along a straight line. In this way, unnecessary bends and changes can be reduced, and the flow resistance of the fluid can be reduced, thereby further ensuring the smoothness and response speed of the opening and closing of the first valve needle 200 and the second valve needle 300.
[0043] In an embodiment of the present utility model, a plurality of balance holes are provided, and the plurality of balance holes are arranged at intervals on the first valve needle 200. By providing a plurality of balance holes, the flow rate of the balance channel 400 can be increased, and the smoothness and response speed of the opening and closing of the first valve needle 200 and the second valve needle 300 can be further improved. In addition, in some cases, it is easier to implement a plurality of smaller balance holes than to provide a single large balance hole. Especially in the case of limited space, a plurality of balance holes can provide better design flexibility for the first valve needle 200.
[0044] As Figure 3In one embodiment of the utility model, a plurality of balancing holes are arranged in a circular array around the axis of the first valve needle 200. This allows the fluid to enter the guide hole 130 more evenly, ensures the consistency of the pressure difference at each position in the guide hole 130 and the mounting hole, and ensures that the first valve needle 200 and the second valve needle 300 move more smoothly. In addition, the use of a uniformly distributed method such as a circular array to set the balancing holes also helps to reduce the vibration and noise caused by the fluid flow, and improves the quiet performance of the electronic expansion valve.
[0045] like Figure 3 In one embodiment of the utility model, the balancing hole is a circular hole. The use of the circular hole geometry can make the fluid more evenly distributed when passing through the balancing hole, which helps to reduce eddy currents in the fluid flow, thereby reducing flow resistance; in addition, compared with other special-shaped holes such as square holes, circular holes are easier to process, which is conducive to further reducing the processing difficulty of the balancing channel 400 and reducing manufacturing costs.
[0046] In an embodiment of the utility model, the diameter of the balancing hole is not less than 0.8 mm. Considering the existence of fluid viscosity, in order to balance the structural design of the first valve needle 200 and reduce the flow resistance of the fluid passing through the balancing hole as much as possible, in this solution, the diameter of the balancing hole needs to be not less than 0.8 mm, which is not only for the purpose of improving the response speed of the first valve needle 200, but also for reducing the noise of the fluid when flowing through the balancing hole, and improving the quiet performance of the electronic expansion valve. In addition, the hole diameter of 0.8 mm or more is also convenient for processing using standard drilling tools, reducing the difficulty of processing, and helping to improve the processability of the first valve needle 200.
[0047] In order to improve the flow capacity of the first valve port 120, in an embodiment of the present invention, the diameter of the first valve port 120 is A, where 10 mm < A ≤ 16 mm. The traditional dual-valve-needle electronic expansion valve structure applied to vehicles usually has a full-flow diameter of 10 mm, and the diameter of the first valve needle 200 is not less than 16 mm, so as to improve the flow capacity of the electronic expansion valve. Since the size of the first valve needle 200 increases, the sizes of the rotor 60, stator and other components need to be increased accordingly. To balance the flow capacity and manufacturing cost, in this solution, the diameter of the first valve port 120 is preferably 16 mm. After increasing the diameter of the first valve port 120, on the premise that the flow capacity is better than or equivalent to the original, the moving distance of the first valve needle 200 can be shortened. In this solution, the moving stroke of the first valve needle 200 is less than 2.5 mm, preferably 1.8 mm. In this way, it is equivalent to shortening the time for the first valve needle 200 to move from fully closed to fully open, and improving the response speed of the electronic expansion valve. In addition, in another embodiment of the present invention, since the stroke of the first valve needle 200 is shortened, the moving stroke of the second valve needle 300 can be adaptively increased. The moving stroke of the second valve needle 300 is the stroke of the second valve needle 300 relative to the first valve needle 200. In this solution, the moving stroke of the second valve needle 300 can be greater than 1.5 mm, which can improve the adjustment range in the small-flow adjustment stage and improve the adjustment accuracy. Similarly, to balance the adjustment range and manufacturing cost, the moving stroke of the second valve needle 300 is preferably 2.2 mm. In this way, by increasing the size of the first valve port 120, reducing the moving stroke of the first valve needle 200 and increasing the moving stroke of the second valve needle 300, while improving the flow capacity of the electronic expansion valve, the response speed and adjustment accuracy of the electronic expansion valve are also improved, and the overall performance of the electronic expansion valve is optimized.
[0048] In addition, in order to ensure the reliability when the first valve needle 200 blocks the first valve port 120, in an embodiment of the present invention, the diameter of the first valve needle 200 is B, where B ≥ A + 0.5 mm, that is, the diameter of the first valve needle 200 is at least 0.5 mm larger than the diameter of the first valve port 120. In this way, a sufficient tolerance range for the dimensional deviation of the first valve needle 200 and the first valve port 120 during the manufacturing process can be given, ensuring that even if there is a slight dimensional deviation during the manufacturing process of the first valve needle 200 and the first valve port 120, the first valve needle 200 can still maintain good sealing cooperation with the first valve port 120, reducing the leakage risk caused by manufacturing errors, and improving the overall reliability of the electronic expansion valve.
[0049] The present invention also proposes an air-conditioning system, which is provided with the above-mentioned electronic expansion valve. The specific structure of the electronic expansion valve refers to the above-mentioned embodiments. Since this air-conditioning system adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.
[0050] The present utility model further provides a vehicle, which is provided with the above-mentioned air conditioning system. The specific structure of the air conditioning system refers to the above-mentioned embodiments. Since this vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated one by one here.
[0051] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.
Claims
1. An electronic expansion valve, characterized in that: include: A valve body, provided with a valve cavity and a first valve port communicating with the valve cavity, and the valve body is also provided with a guide hole; a first valve needle installed in the guide hole and moving under the guidance of the guide hole to open or close the first valve port, the first valve needle also having a second valve port communicating with the first valve port and the valve cavity; a second valve needle movably disposed in the first valve needle to open or close the second valve port, wherein the diameter of the second valve needle is smaller than the diameter of the first valve needle; and A balancing channel is provided on the first valve needle, and the balancing channel communicates with the guide hole and the first valve port.
2. The electronic expansion valve according to claim 1, characterized in that: The balancing channel is configured as a balancing hole, and the axis of the balancing hole is arranged parallel to the axis of the first valve needle.
3. The electronic expansion valve according to claim 2, characterized in that: A plurality of the balancing holes are provided, and the plurality of the balancing holes are arranged at intervals on the first valve needle.
4. The electronic expansion valve according to claim 3, characterized in that: The plurality of balancing holes are arranged in a circular array around the axis of the first valve needle.
5. The electronic expansion valve according to claim 2, characterized in that: The balancing hole is a circular hole.
6. The electronic expansion valve according to claim 2, characterized in that: The diameter of the balancing hole is not less than 0.8 mm.
7. The electronic expansion valve according to claim 1, characterized in that: The diameter of the first valve port is A, wherein 10 mm<A≤16 mm.
8. The electronic expansion valve according to claim 7, characterized in that: The movable stroke of the first valve needle is less than 2.5 mm; and / or the movable stroke of the second valve needle is greater than 1.5 mm.
9. The electronic expansion valve according to claim 7, characterized in that: The diameter of the first valve needle is B, where B≥A+0.5 mm.
10. An air conditioning system, characterized in that: The electronic expansion valve comprises the electronic expansion valve as claimed in any one of claims 1 to 9.
11. A vehicle, characterized in that: The air conditioning system comprises the air conditioning system as claimed in claim 10.