Electronic expansion valve
By designing the mating structure of the first mating section and the first mating part in the electronic expansion valve, the problem that the valve opening degree in the prior art is difficult to limit in a specific range, and a stable throttling area and high-precision flow adjustment within a specific flow range are achieved.
Patent Information
- Application Number
- CN202311815640.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2025-06-27
AI Technical Summary
When existing electronic expansion valves need to maintain a constant temperature, it is difficult to limit the opening of the valve to a specific range, resulting in fluctuations in the throttling area and affecting the accuracy of flow adjustment.
An electronic expansion valve is designed, and the mating structure of the valve core and the throttle hole includes a first mating section and a first mating section to ensure that the first mating section is always located in the first mating section within a specific flow range, so that the cross-sectional area formed remains unchanged, so that the opening of the valve is controlled within a specific slightly changing range.
Through this structural design, the electronic expansion valve can maintain a stable throttling area within a specific flow range, ensuring that the valve opening is within a specific range, and improving the accuracy and stability of flow adjustment.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of control valves, and particularly to an electronic expansion valve. Background Art
[0002] In an electronic expansion valve, the valve core changes the relative position with the flow regulating surface of the inner wall of the second channel to realize the change of the flow passage area, so as to realize flow regulation. In the actual use process, different systems and operating conditions have different requirements for flow regulation. When it is necessary to maintain a constant temperature, the valve core is controlled to maintain a certain opening degree, specifically, to keep the throttling area enclosed by the valve core and the second channel unchanged.
[0003] At present, the existing electronic expansion valves usually adopt a flared seal structure to achieve flow blockage. Due to related errors, after the controller gives a specified number of pulses, the valve core moves up and down within a small range, resulting in a certain fluctuation of the throttling area, and it is difficult to limit the opening degree of the valve within a specific range. Summary of the Invention
[0004] The present invention aims to provide an electronic expansion valve that can ensure that the opening degree of the valve is maintained within a specific range.
[0005] An electronic expansion valve includes a valve seat (2) and a valve core (1). The valve seat (2) includes a throttling hole (20), and the throttling hole wall portion (21) corresponding to the throttling hole (20) includes a first matching section (210). At least part of the valve core (1) can be located in the throttling hole (20). The valve core (1) can move relative to the throttling hole (20) along the axial direction of the valve core (1). The valve core (1) includes an outer peripheral wall portion (100), and the outer peripheral wall portion (100) has a first matching portion (101). The inner diameter of the first matching section (210) is larger than the diameter of the first matching portion (101), and along the axial direction of the valve core (1), the difference between the inner diameter of the first matching section (210) and the diameter of the first matching portion (101) is the same. The electronic expansion valve has a specific flow rate area. In this specific flow rate area, the valve core (1) can have a certain moving distance and at least part of the first matching portion (101) always corresponds to the first matching section (210).
[0006] The above technical solution has the following technical effects: When in the specific flow rate area of the electronic expansion valve, the first matching portion of the valve core is always located in the first matching section of the valve seat, so that the cross-sectional area formed between the side wall corresponding to the first matching portion and the first matching section can remain unchanged, and the opening degree of the valve is controlled within a specific small change range. Description of the Drawings
[0007] The features and advantages of one or more embodiments of the present invention will become more readily understood from the following description with reference to the accompanying drawings, in which:
[0008] Figure 1 is a schematic cross-sectional view of an embodiment of an electronic expansion valve;
[0009] Figure 2 is a schematic view of the first embodiment of the electronic expansion valve;
[0010] Figure 3 is a schematic view of the second embodiment of the electronic expansion valve;
[0011] Figure 4 is a schematic view of the third embodiment of the electronic expansion valve;
[0012] Figure 5 is a schematic view of the fourth embodiment of the electronic expansion valve;
[0013] Reference numerals: 1, valve core; 100, outer peripheral wall portion; 101, first mating portion; 102, second connecting wall; 2, valve seat; 20, throttle orifice; 21, throttle orifice wall portion; 210, first mating section; 211, first limiting section; 22, second mating section; 23, third mating section; 24, first connecting wall; 3, first channel; 4, lead screw assembly; p, linear displacement of one pulse; m, number of pulses; n, pulse tolerance; l, axial height of the first mating portion; s, throttle area; r, cross-sectional radius of the first mating portion; R, cross-sectional radius of the first mating section. Detailed Description of the Embodiment
[0014] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the invention.
[0015] As Figure 1 shown, Figure 1An electronic expansion valve is shown, the valve seat (2) includes a throttle orifice (20), the throttle orifice wall portion (21) corresponding to the throttle orifice (20) includes a first mating section (210), at least part of the valve core (1) can be located in the throttle orifice (20), the valve core (1) can move relative to the throttle orifice (20) along the axial direction of the valve core (1), the valve core (1) includes an outer peripheral wall portion (100), the outer peripheral wall portion (100) has a first mating portion (101), the inner diameter of the first mating section (210) is larger than the diameter of the first mating portion (101), and along the axial direction of the valve core (1), the difference between the inner diameter of the first mating section (210) and the diameter of the first mating portion (101) is the same. The electronic expansion valve has a specific flow rate area, in this specific flow rate area, the valve core (1) can have a certain moving distance and at least part of the first mating portion (101) always corresponds to the first mating section (210).
[0016] In the specific flow rate area, the valve core (1) has a first position and a second position in the axial direction. When in the first position, the area of the throttling area formed by the first mating portion 101 and the first mating section 210 is a first throttling area (S1). When in the second position, the area of the throttling area formed by the first mating portion 101 and the first mating section 210 is a second throttling area (S2). The relationship between the first throttling area (S1) and the second throttling area (S2) is: 0.01mm 2 ≤∣S1 - S2∣≤0.05mm 2 。
[0017] Specifically, the lead screw assembly 4 drives the valve core 1 to move towards the throttle orifice wall portion 21. When the electronic expansion valve is in this specific flow rate area, the valve core 1 is always in an open state. The fluid enters the throttle orifice 20 along the first channel 3. Due to the instability of the pulses emitted by the electronic expansion valve, the valve core 1 will move back and forth within a small distance range in the axial direction, but at least part of the first mating portion 101 of the valve core 1 is always located in the first mating section 210, so that the electronic expansion valve always maintains a specific and slightly changing flow rate range. When the electronic expansion valve needs to close the valve, the bottom end of the valve core 1 abuts against the corresponding wall of the throttle orifice wall portion 21.
[0018] In addition, the electronic expansion valve has a small flow rate area. The value of the first throttling area (S1) is: 0.05mm 2 ≤S1<0.3mm 2 ,The value of the second throttling area (S2) is: 0.05mm 2 ≤S2<0.3mm 2 。
[0019] Specifically, as Figure 2 shown, the throttle hole wall portion 21 includes the first fitting section 210 and the first limiting section 211. The first fitting section 210 is a part along the circumferential wall corresponding to the throttle hole wall portion 21. The first limiting section 211 is along the circumferential wall corresponding to the throttle hole wall portion 21. The first limiting section 211 is the remaining part excluding the circumferential wall corresponding to the first fitting section 210. The wall portion corresponding to the first fitting section 210 protrudes away from the valve core 1 relative to the wall portion corresponding to the first limiting section 211. In the specific flow rate area of the electronic expansion valve, the first limiting section 211 abuts against the first fitting portion 101. By processing the first fitting section 210 in the above solution, a small flow rate area formed between the first fitting section 210 and the first fitting portion 101 can be achieved, and the processing method of the above solution is simple and convenient.
[0020] In addition, the throttle hole wall portion 21 includes the first fitting section 210 and the second fitting section 22. The second fitting section 22 is located at the lower end of the first fitting section 210 and axially away from the valve core 1 relative to the first fitting section 210. The second fitting section 22 is axially connected to the first fitting section 210, and the second fitting section 22 protrudes radially relative to the first fitting section 210. The valve core 1 has a closed state and an open state. When the valve core 1 is in the closed state, the valve core 1 can abut against the wall portion corresponding to the second fitting section 22, and the wall portion corresponding to the second fitting section 22 is closer to the valve core 1 relative to the first fitting section 210.
[0021] The valve core 1 further includes a second connecting wall 102. One end of the second connecting wall 102 is connected to the outer peripheral wall portion 100, and the other end of the second connecting wall 102 is connected to the bottom wall of the valve core 1. The second connecting wall 102 is inclined towards the axis of the valve core 1 relative to the outer peripheral wall portion 100;
[0022] When the valve core 1 is in the closed state, the second connecting wall 102 abuts against the wall portion corresponding to the first fitting section 210. By providing the second connecting wall 102, the cooperation between the first fitting portion 101 and the wall portion corresponding to the first fitting section 210 can be made more tight; when in the open state, the second connecting wall 102 has no contact with the wall portion corresponding to the first fitting section 210.
[0023] As Figure 3As shown, it is the second embodiment of the electronic expansion valve. The throttle hole wall portion 21 includes a third mating section 23. The third mating section 23 is located at the upper end of the first mating section 210 and is axially closer to the valve core 1 relative to the first mating section 210. The third mating section 23 is axially connected to the first mating section 210. The third mating section 23 protrudes radially relative to the first mating section 210 and the corresponding wall portion of the third mating section 23 is farther from the valve core 1 relative to the first mating section 210. In the above embodiment, due to the high precision of the electronic expansion valve, the method of machining the third mating section 23 first and then machining the second mating section 22 can make the position determination of the second mating section 22 more accurate.
[0024] The electronic expansion valve has a large flow rate area. The value of the first throttle area (S1) is: 0.3 mm 2 ≤S1≤1 mm 2 and the value of the second throttle area (S2) is: 0.3 mm 2 ≤S2≤1 mm 2 .
[0025] Specifically, as Figure 4 shown, it is the third embodiment of the electronic expansion valve. The throttle hole wall portion 21 includes the first mating section 210 and the second mating section 22. The first mating section 210 is a complete circle along the corresponding circumferential wall of the throttle hole wall portion 21. The second mating section 22 is located at the lower end of the first mating section 210 and is axially farther from the valve core 1 relative to the first mating section 210. The second mating section 22 is axially connected to the first mating section 210. The second mating section 22 protrudes radially relative to the first mating section 210 and the corresponding wall portion of the second mating section 22 is closer to the valve core 1 relative to the first mating section 210. In the specific flow rate area of the electronic expansion valve, the first limiting section 211 and the first mating portion 101 are in clearance fit. The above method can meet the requirement that when the electronic expansion valve needs a specific large flow rate, the flow rate of the electronic expansion valve can be maintained in a relatively constant flow state.
[0026] The valve core 1 further includes a second connecting wall 102. One end of the second connecting wall 102 is connected to the outer peripheral wall portion 100, and the other end of the second connecting wall 102 is connected to the bottom wall of the valve core 1. The second connecting wall 102 is inclined towards the axis direction of the valve core 1 relative to the outer peripheral wall portion 100;
[0027] The throttle hole wall portion 21 further includes a first connecting wall 24. One end of the first connecting wall 24 is connected to the wall portion corresponding to the first fitting section 210, and the other end of the first connecting wall 24 is connected to the wall portion corresponding to the second fitting section 22. The first connecting wall 24 is inclined toward the axis of the valve core 1 with respect to the wall portion corresponding to the first fitting section 210.
[0028] The valve core 1 has a closed state and an open state. In the closed state, the first connecting wall 24 abuts against the second connecting wall 102; in the open state, the first connecting wall 24 is not in contact with the second connecting wall 102.
[0029] The abutting and cooperating manner between the first connecting wall 24 and the second connecting wall 102 is more reliable and stable, preventing fluid from leaking between the first connecting wall 24 and the second connecting wall 102.
[0030] In addition, the second fitting section 22 protrudes radially with respect to the first fitting section 210, and the wall portion corresponding to the second fitting section 22 is closer to the valve core 1 with respect to the first fitting section 210, for the convenience of machining the second connecting wall 102.
[0031] The number of pulses m emitted by the electronic expansion valve is controlled by a controller. The linear displacement p and pulse tolerance n of one pulse emitted by the electronic expansion valve are both known. The linear displacement p of one pulse refers to the distance that the valve core 1 moves axially when the controller emits one pulse. Due to the uncertainty of the pulse tolerance n, the first fitting portion 101 will move back and forth axially within the first fitting section 210. Thus, the relationship between the axial height l of the first fitting section 210, the linear displacement p of one pulse of the electronic expansion valve, the number of pulses m, and the pulse tolerance n can be determined as l = p×(m + |n|);
[0032] The required opening degree of the electronic expansion valve is determined by the cross-sectional area s formed between the first fitting portion 101 and the side wall corresponding to the first fitting section 210. The relationship between the throttling area (s) required for the electronic expansion valve to maintain a specific flow rate, the cross-sectional radius (r) of the first fitting portion 101, and the cross-sectional radius (R) of the first fitting section 210 is as follows:
[0033]
[0034] When the electronic expansion valve needs to maintain a specific flow rate, the cross-sectional radius r of the first mating portion 101 and the cross-sectional radius R of the first mating section 210 are determined according to the above formula, so that the cross-sectional area of the space formed between the wall of the first mating portion 101 of the valve core 1 and the corresponding wall of the first mating section 210 of the throttle hole wall portion 21 remains unchanged, thereby keeping the throttle area of the electronic expansion valve stable.
[0035] As Figure 5 shown, it is the fourth embodiment of the electronic expansion valve. The throttle hole wall portion 21 includes a third mating section 23. The third mating section 23 protrudes radially relative to the first mating section 210 and the corresponding wall of the third mating section 23 is away from the valve core 1 relative to the first mating section 210. In the above embodiment, due to the high precision of the electronic expansion valve, the method of machining the third mating section 23 first and then machining the second mating section 22 can make the position of the second mating section 22 more accurately determined.
[0036] Specifically, when the valve core 1 is opened, the valve core 1 moves along the axial direction driven by the lead screw assembly 4. After the electronic expansion valve gives a pulse, the valve core 1 moves towards the throttle hole wall portion 21. The first mating portion 101 of the valve core 1 is always located within the first mating section 210 of the throttle hole wall portion 21. The cross-sectional area of the space formed between the corresponding wall of the first mating portion 101 of the valve core 1 and the corresponding wall of the first mating section 210 of the throttle hole wall portion 21 always remains unchanged, so that the flow rate passing between the first mating portion 101 and the corresponding side wall of the first mating section 210 is always maintained within a specific small change range. When the valve core 1 needs to close the valve, the corresponding wall of the second connecting wall 102 of the valve core 1 abuts against the corresponding side wall of the first connecting wall 24 of the throttle hole wall portion 21.
[0037] It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. For example, the definition of directions such as "front", "rear", "left", "right", "up", and "down". Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still combine, modify or equivalently replace the present invention. All technical solutions and their improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.
Claims
1. An electronic expansion valve, characterized in that, It includes a valve seat (2) and a valve core (1). The valve seat (2) includes a throttle hole (20). The throttle hole wall portion (21) corresponding to the throttle hole (20) includes a first mating section (210). At least part of the valve core (1) can be located in the throttle hole (20). The valve core (1) can move relative to the throttle hole (20) along the axial direction of the valve core (1). The valve core (1) includes an outer peripheral wall portion (100). The outer peripheral wall portion (100) has a first mating portion (101). The inner diameter of the first mating section (210) is larger than the diameter of the first mating portion (101). And along the axial direction of the valve core (1), the difference between the inner diameter of the first mating section (210) and the diameter of the first mating portion (101) is the same. The electronic expansion valve has a specific flow rate area. In this specific flow rate area, the valve core (1) can have a certain moving distance and at least part of the first mating portion (101) always corresponds to the first mating section (210).
2. The electronic expansion valve according to claim 1, characterized in that, In the specific flow rate region, the valve core (1) has a first position and a second position in the axial direction. When in the first position, the area of the throttling region formed by the first engaging portion (101) and the first engaging section (210) is a first throttling area (S1). When in the second position, the area of the throttling region formed by the first engaging portion (101) and the first engaging section (210) is a second throttling area (S2). The relationship between the first throttling area (S1) and the second throttling area (S2) is: 0.01 mm 2 ≤ |S1 - S2| ≤ 0.05 mm 2 .
3. The electronic expansion valve according to claim 2, wherein The electronic expansion valve has a small flow rate region, and the value of the first throttling area (S1) is: 0.05 mm 2 ≤ S1 < 0.3 mm 2 , and the value of the second throttling area (S2) is: 0.05 mm 2 ≤ S2 < 0.3 mm 2 .
4. The electronic expansion valve according to claim 3, wherein The throttle hole wall portion (21) includes the first mating section (210) and a first limiting section (211). The first mating section (210) is a part along one circle of the circumferential wall corresponding to the throttle hole wall portion (21). The first limiting section (211) is along the circumferential wall corresponding to the throttle hole wall portion (21). The first limiting section (211) is the remaining part except for the circumferential wall corresponding to the first mating section (210). The wall portion corresponding to the first mating section (210) protrudes away from the valve core (1) relative to the wall portion corresponding to the first limiting section (211). In the specific flow rate area of the electronic expansion valve, the first limiting section (211) abuts against the first mating portion (101).
5. The electronic expansion valve according to claim 4, wherein The throttle hole wall portion (21) includes the first mating section (210) and a second mating section (22). The second mating section (22) is located at the lower end of the first mating section (210) and is axially away from the valve core (1) relative to the first mating section (210). The second mating section (22) is axially connected to the first mating section (210). The second mating section (22) protrudes radially relative to the first mating section (210) and the wall portion corresponding to the second mating section (22) is closer to the valve core (1) relative to the first mating section (210).
6. The electronic expansion valve according to claim 5, characterized in that The valve core (1) further includes a second connecting wall (102). One end of the second connecting wall (102) is connected to the outer peripheral wall portion (100). The other end of the second connecting wall (102) is connected to the bottom wall of the valve core (1). The second connecting wall (102) is inclined towards the axis direction of the valve core (1) relative to the outer peripheral wall portion (100). The valve core (1) has a closed state and an open state. In the closed state, the first connecting wall (24) abuts against the wall portion corresponding to the first mating portion (101). In the open state, the first connecting wall (24) has no contact with the wall portion corresponding to the first mating portion (101).
7. The electronic expansion valve according to claim 2, wherein The electronic expansion valve has a large flow rate region, and the value of the first throttling area (S1) is: 0.3 mm 2 ≤ S1 ≤ 1 mm 2 , and the value of the second throttling area (S2) is: 0.3 mm 2 ≤ S2 ≤ 1 mm 2 .
8. The electronic expansion valve according to claim 7, wherein The throttle hole wall portion (21) includes the first fitting section (210) and the second fitting section (22). The first fitting section (210) is a complete circle along the corresponding circumferential wall of the throttle hole wall portion (21). The second fitting section (22) is located at the lower end of the first fitting section (210) and is axially away from the valve core (1) relative to the first fitting section (210). The second fitting section (22) is axially connected to the first fitting section (210). The second fitting section (22) protrudes radially relative to the first fitting section (210), and the corresponding wall portion of the second fitting section (22) is closer to the valve core (1) than the first fitting section (210). In a specific flow rate region of the electronic expansion valve, the first limiting section (211) and the first fitting portion (101) are in clearance fit.
9. The electronic expansion valve according to claim 7, wherein The valve core (1) further includes a second connecting wall (102). One end of the second connecting wall (102) is connected to the outer peripheral wall portion (100), and the other end of the second connecting wall (102) is connected to the bottom wall of the valve core (1). The second connecting wall (102) is inclined towards the axis of the valve core (1) relative to the outer peripheral wall portion (100); The throttle hole wall portion (21) further includes a first connecting wall (24). One end of the first connecting wall (24) is connected to the corresponding wall portion of the first fitting section (210), and the other end of the first connecting wall (24) is connected to the corresponding wall portion of the second fitting section (22). The first connecting wall (24) is inclined towards the axis of the valve core (1) relative to the corresponding wall portion of the first fitting section (210); The valve core (1) has a closed state and an open state. In the closed state, the first connecting wall (24) abuts against the second connecting wall (102); in the open state, the first connecting wall (24) is not in contact with the second connecting wall (102).
10. The electronic expansion valve according to claim 5 or 8, characterized in that, The throttle hole wall portion (21) includes a third fitting section (23). The third fitting section (23) is located at the upper end of the first fitting section (210) and is axially close to the valve core (1) relative to the first fitting section (210). The third fitting section (23) is axially connected to the first fitting section (210). The third fitting section (23) protrudes radially relative to the first fitting section (210), and the corresponding wall portion of the third fitting section (23) is farther from the valve core (1) than the first fitting section (210).
11. The electronic expansion valve according to claim 7, characterized in that, The relationship between the linear displacement (p) of one pulse, the number of pulses (m), the pulse tolerance (n), and the axial height (l) of the first fitting section (210) of the electronic expansion valve is l = p×(m + |n|); The relationship among the throttling area (s) required for the electronic expansion valve to maintain a specific flow rate, the cross-sectional radius (r) of the first fitting portion (101), and the cross-sectional radius (R) of the first fitting section (210) is as follows: