Electronic expansion valve
By incorporating a multi-channel structure and sealing components in the electronic expansion valve to adjust the flow area, the problem of unstable flow in traditional electronic expansion valves in large-diameter bidirectional valves is solved, achieving flow stability and adjustability, and improving the valve core's actuation performance.
Patent Information
- Application Number
- CN202410968902.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2026-01-20
AI Technical Summary
Traditional electronic expansion valves have difficulty maintaining a certain flow rate when the valve is closed in large-diameter two-way valves, and the valve core's operating performance is affected by refrigerant pressure.
An electronic expansion valve was designed. By setting a first channel, a second channel, and a third channel between the valve core and the valve core sleeve, and connecting the fluid inlet, fluid outlet, first channel, second channel, and third channel when the valve is closed, the flow area of the second channel can be adjusted in combination with the sealing component to ensure the stability and adjustability of the flow rate.
This technology enables large-diameter bidirectional valves to maintain a certain flow rate when the valve is closed, improving the valve core's actuation performance and flow regulation accuracy, and making it suitable for different flow requirements.
Smart Images
Figure CN121363825A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of refrigeration control, in particular to an electronic expansion valve. BACKGROUND
[0002] The conventional electronic expansion valve usually realizes that the valve closing position still maintains a certain flow rate by the incomplete adhesion of the valve needle and the valve port, but this implementation is more suitable for small-diameter valve structures, and it is difficult to realize for other structure forms such as large-diameter bidirectional valves. SUMMARY
[0003] The purpose of the present application is to provide an electronic expansion valve suitable for large-diameter bidirectional valves and realizing that the valve closing position still maintains a certain flow rate.
[0004] To solve the above technical problems, the present application provides an electronic expansion valve provided with a valve port part, a fluid inlet and a fluid outlet, the electronic expansion valve comprising a valve core, a valve core sleeve and a nut, the valve core being provided with a first channel, the valve core being partially arranged inside the valve core sleeve, the outer wall of the valve core and the inner wall of the valve core sleeve having a second channel therebetween, the valve core being limitingly connected with the nut, the nut and the valve core having a third channel therebetween, the valve core having a valve port matching part, the valve core being capable of moving axially relative to the valve core sleeve,
[0005] The electronic expansion valve has a valve closing position, at the valve closing position, the valve port matching part and the valve port part are sealingly matched, and the fluid inlet, the fluid outlet, the first channel, the second channel and the third channel are communicated.
[0006] The technical effects of the electronic expansion valve of the present application are as follows:
[0007] In the electronic expansion valve of the present embodiment, the valve core is provided with the first channel, the third channel is between the nut and the valve core, the matching relationship between the valve core and the valve core sleeve in the conventional electronic expansion valve is changed, the second channel is between the outer wall of the valve core and the inner wall of the valve core sleeve, when the electronic expansion valve is at the valve closing position, the fluid inlet, the fluid outlet, the first channel, the second channel and the third channel are communicated, the valve closing position of the electronic expansion valve still maintains a certain flow rate, the flow direction of the refrigerant is not limited, and the electronic expansion valve can be a large-diameter bidirectional valve. BRIEF DESCRIPTION OF DRAWINGS
[0008] Figure 1 The structure schematic diagram of the first specific embodiment of the electronic expansion valve provided by the present application is shown in the figure;
[0009] Figure 2 The structure schematic diagram of the second specific embodiment of the electronic expansion valve provided by the present application is shown in the figure; Figure 1 The axial sectional view of the electronic expansion valve at the first angle;
[0010] Figure 3 The axial sectional view of the electronic expansion valve at the second angle;Figure 1 Axial sectional view of the electronic expansion valve in the second angle;
[0011] Figure 4 Structure diagram of the electronic expansion valve in the second embodiment of the present application;
[0012] Figure 5 Structure diagram of the electronic expansion valve in the third embodiment of the present application; Figure 1 Structure diagram of the seal ring in the electronic expansion valve;
[0013] Figure 6 Structure diagram of the seal ring in the electronic expansion valve; Figure 5 Structure diagram of the seal ring in the second angle;
[0014] Figure 7 Structure diagram of the electronic expansion valve in the third embodiment of the present application;
[0015] Figure 8 Structure diagram of the electronic expansion valve in the third embodiment of the present application; Figure 7 Structure diagram of the valve core in the electronic expansion valve;
[0016] Figure 9 Structure diagram of the valve core in the electronic expansion valve; Figure 8 Structure diagram of the valve core in the second angle;
[0017] Figure 10 Structure diagram of the valve core in the electronic expansion valve; Figure 9 Sectional view of the valve core in the A-A direction;
[0018] Figure 11 Sectional view of the valve core in the B-B direction; Figure 9
[0019] Figure 12 Structure diagram of the valve core and the nut in the first angle; Figure 1 Figure 4 Figure 7 Structure diagram of the valve core and the nut in the second angle;
[0020] Figure 13 Structure diagram of the valve core and the nut in the second angle; Figure 1 Figure 4 Figure 7 Structure diagram of the valve core and the nut in the second angle;
[0021] In the drawings, Figures 1-13 The reference signs in the drawings are as follows:
[0022] 101-Valve core; 101a-Balance channel; 1011-Large diameter section; 1012-Small diameter section; 101A-Valve port mating part; 102-Valve core sleeve; 103-Sealing ring; 103a-Opening groove; 104-Annular sealing ring; 105-Valve seat; 105a-Inner cavity; 106-First connecting pipe; 107-Second connecting pipe; 108-Nut; 108a-Limiting protrusion; 109-Retaining ring; 110-Lead screw; 111-Rotor; 112-External coil; 113-Limiting seat; 113a-Limiting groove;
[0023] a - First channel; b - Second channel; c - Third channel; c1 - First gap; c2 - Second gap; d - Flow groove;
[0024] A - Valve port; I - Fluid inlet; O - Fluid outlet. Detailed Implementation
[0025] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] In this article, the extension direction of valve core 101 is axial, and the direction perpendicular to the extension direction of valve core 101 is transverse.
[0027] Please refer to Figures 1-3 , Figure 1 A schematic diagram of the structure of a first specific embodiment of the electronic expansion valve provided in this application; Figure 2 for Figure 1 Axial cross-sectional view of the electronic expansion valve at the first angle; Figure 3 for Figure 1 Axial cross-sectional view of the electronic expansion valve at the second angle.
[0028] This embodiment provides an electronic expansion valve with a valve port A, a fluid inlet I, and a fluid outlet O. The electronic expansion valve includes a valve core 101, a valve core sleeve 102, and a nut 108. The valve core 101 has a first channel a, and part of the valve core 101 is disposed inside the valve core sleeve 102. A second channel b is provided between the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102. The valve core 101 is limitedly connected to the nut 108, and a third channel c is provided between the nut 108 and the valve core 101. The valve core 101 has a valve port mating part 101A, and the valve core 101 is axially movable relative to the valve core sleeve 102.
[0029] The electronic expansion valve has a closed position. In the closed position, the valve port mating part 101A and the valve port part A are sealed together, and the fluid inlet I, the fluid outlet O, the first channel a, the second channel b and the third channel c are connected.
[0030] In the electronic expansion valve, the valve core 101 is provided with the first passage a, the third passage c is formed between the nut 108 and the valve core 101, the cooperation relationship between the valve core 101 and the valve core sleeve 102 in the conventional electronic expansion valve is changed, the second passage b is formed between the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102, when the electronic expansion valve is in the valve closing position, the fluid inlet I, the fluid outlet O, the first passage a, the second passage b and the third passage c are communicated, the electronic expansion valve still maintains a certain flow rate in the valve closing position, and the electronic expansion valve can be a large-diameter valve.
[0031] As shown in Figure 1 the electronic expansion valve has the first port arranged in the transverse direction and the second port arranged in the axial direction, when the first port is the fluid inlet I and the second port is the fluid outlet O, the fluid outlet O is arranged opposite to the valve port A, when the electronic expansion valve is in the valve closing position, the refrigerant from the fluid inlet I flows through the second passage b, the third passage c and the first passage a in sequence, and finally flows out from the fluid outlet O through the valve port A; when the second port is the fluid inlet I and the first port is the fluid outlet O, the fluid inlet I is arranged opposite to the valve port A, when the electronic expansion valve is in the valve closing position, the refrigerant from the fluid inlet I first passes through the valve port A, and then flows through the first passage a, the third passage c and the second passage b in sequence, and finally flows out from the fluid outlet O.
[0032] It can be seen that in the electronic expansion valve, a certain flow rate can be maintained in the valve closing position under the bidirectional flow condition of the refrigerant, and the electronic expansion valve can be a bidirectional valve.
[0033] In addition, in order to realize reliable sealing in the valve closing position, the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102 are provided with a sealing ring, under the pressure of the refrigerant, the friction force of the sealing ring on the valve core 101 increases with the pressure of the refrigerant, which affects the action performance of the valve core 101; in the embodiment, the second passage b is formed between the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102, the valve core 101 is no longer subjected to the friction force which increases with the pressure of the refrigerant, the action of the valve core 101 is smoother, and the action performance of the valve core 101 is improved.
[0034] In the embodiment, the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102 are in clearance fit, and the annular passage is formed between the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102, which is the aforementioned second passage b.
[0035] It can be understood that the flow rate of the electronic expansion valve at the closed valve position is determined by the minimum flow area of the first passage a, the second passage b and the third passage c, and the flow areas of the first passage a and the third passage c are usually larger than that of the second passage b, and the flow area of the second passage b is also more convenient to control. Therefore, in the embodiment, the flow rate of the electronic expansion valve at the closed valve position is determined by the minimum flow area of the second passage b. In the first embodiment, the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102 are in clearance fit, and the flow area of the second passage b is always equal along the flow direction of the fluid. By adjusting the fit clearance between the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102, the different flow requirements of the electronic expansion valve at the closed valve position can be met.
[0036] In order to more conveniently adjust the flow rate of the electronic expansion valve at the closed valve position, the electronic expansion valve of the embodiment further comprises a sealing member, which is arranged between the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102. The sealing member seals part of the area between the valve core 101 and the valve core sleeve 102 in the circumferential direction. Except for the sealing area of the sealing member, the remaining circumferential area forms part of the second passage b.
[0037] As arranged above, in the axial area where the sealing member is located, the sealing member seals part of the area between the valve core 101 and the valve core sleeve 102 in the circumferential direction, and the fluid can only flow through the remaining circumferential area except for the sealing area. In this way, the flow area of the remaining circumferential area is the minimum flow area of the second passage b. By adjusting the flow area of the remaining circumferential area, the flow rate of the electronic expansion valve at the closed valve position can be adjusted. The fit clearance between the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102 can always remain unchanged, meeting the different flow requirements of the electronic expansion valve at the closed valve position. The reliable installation of the valve core 101 is ensured, and the adjustment method is simple and the adjustment accuracy is higher.
[0038] In order to facilitate the adjustment of the minimum flow area of the second passage b, the present application provides the following two embodiments.
[0039] Please refer to Figures 4-6 , Figure 4 for the structure schematic diagram of the second specific embodiment of the electronic expansion valve provided by the present application; Figure 5 for Figure 1 the structure schematic diagram of the sealing ring in the electronic expansion valve; Figure 6 for Figure 5 the structure schematic diagram of the sealing ring at the second angle.
[0040] In this embodiment, the sealing component includes a sealing ring 103 which is circumferentially broken, and forms an open slot 103a at the broken part. The sealing ring 103 is installed between the valve core 101 and the valve core sleeve 102, and seals the area between the valve core 101 and the valve core sleeve 102 except the open slot 103a in the circumferential direction. The open slot 103a forms part of the second passage b.
[0041] Thus, in the axial area where the sealing ring 103 is located, the fluid can only flow through the inside of the open slot 103a, and the flow area of the open slot 103a is the minimum flow area of the second passage b. By replacing different sealing rings 103, the cross-sectional area of the open slot 103a can be changed to adjust the minimum flow area of the second passage b to meet the different flow requirements of the electronic expansion valve at the closed valve position. It can be seen that the adjustment method of this embodiment is simpler and has higher adjustment accuracy.
[0042] As shown in the structure diagram of the third embodiment of the electronic expansion valve provided in the present application, Figure 4 in this embodiment, the outer wall of the valve core 101 is provided with an annular groove, and the sealing ring 103a is installed in the annular groove.
[0043] Thus, the annular groove plays a role of positioning and installing the sealing ring 103, and ensures the reliable installation position of the sealing ring 103. Of course, in practice, the annular groove can also be provided on the inner wall of the valve core sleeve 102.
[0044] Please refer to Figures 7-11 , Figure 7 the structure diagram of the third embodiment of the electronic expansion valve provided in the present application; Figure 8 is Figure 7 the structure diagram of the valve core in the electronic expansion valve; Figure 9 is Figure 8 the structure diagram of the valve core at the second angle; Figure 10 is Figure 9 the sectional view of the valve core in the A-A direction; Figure 11 is Figure 9 the sectional view of the valve core in the B-B direction.
[0045] In this embodiment, the outer wall of the valve core 101 is provided with an inner concave flow channel d which extends in the axial direction. The sealing component includes an annular sealing ring 104 which is installed between the valve core 101 and the valve core sleeve 102, and is located in the axial range of the flow channel d. The annular sealing ring 104 seals the area between the valve core 101 and the valve core sleeve 102 except the flow channel d in the circumferential direction. Specifically, the outer wall of the annular sealing ring 104 and the inner wall of the valve core sleeve 102 are circumferentially sealed, and the inner wall of the annular sealing ring 104 and the outer wall of the valve core 101 are circumferentially sealed except the flow channel d. The inside of the flow channel d forms part of the second passage b.
[0046] Thus, in the axial region where the annular sealing ring 104 is located, the fluid can only flow through the flow channel d, and the flow area of the flow channel d is the minimum flow area of the second channel b. By adjusting the cross-sectional area of the flow channel d, the minimum flow area of the second channel b can be adjusted to meet the different flow requirements of the electronic expansion valve at the valve closing position. It can be seen that the adjustment method of the present embodiment is simpler and has higher adjustment accuracy.
[0047] The axial length of the flow channel d is greater than the axial length of the annular sealing ring 104.
[0048] Thus, the annular sealing ring 104 is located in the axial middle part of the flow channel d, one end of the flow channel d forms an inlet, and the other end of the flow channel d forms an outlet, so as to facilitate the flow of the refrigerant through the inside of the flow channel d.
[0049] Please continue to refer to Figures 8-10 In the present embodiment, the valve core 101 includes an axially connected large-diameter section 1011 and a small-diameter section 1012. The large-diameter section 1011 is located at one end close to the valve port A, and the diameter of the small-diameter section 1012 is equal to the diameter of the valve port A.
[0050] Thus, the diameter of the small-diameter section 1012 is equal to the diameter of the valve port A, so that the pressures at both ends of the valve core 101 are balanced, thereby improving the action performance of the valve core 101.
[0051] In the present embodiment, the number of flow channels d provided on the outer wall of the valve core 101 is one. In practice, it is also feasible to provide multiple flow channels d on the outer wall of the valve core 101, and the multiple flow channels d can be distributed in the circumferential direction.
[0052] As shown in Figure 11 In the present embodiment, the profile line of the flow channel d is in the shape of a circular arc.
[0053] In practice, the shape of the flow channel d is not limited to the above-mentioned embodiments. For example, the profile line of the flow channel d can also be in the shape of an acute angle.
[0054] In the present embodiment, the minimum flow area of the second channel b is 1%-10% of the flow area of the valve port A.
[0055] Specifically, in the first embodiment, the flow area of the annular channel between the outer wall of the valve core 101 and the inner wall of the valve core sleeve 102 is 1%-10% of the flow area of the valve port A; specifically in the second embodiment, the flow area of the opening groove 103a is 1%-10% of the flow area of the valve port A; specifically in the third embodiment, the flow area of the flow channel d is 1%-10% of the flow area of the valve port A. In practice, the value of the minimum flow area of the second channel b can be adaptively selected according to the flow requirement at the valve closing position.
[0056] Please refer to Figures 12-13 , Figure 12 for Figure 1 , Figure 4 and Figure 7 for the structural diagram of the first angle of the valve core and the nut. Figure 13 Figure 1 , Figure 4 and Figure 7 for the structural diagram of the second angle of the valve core and the nut.
[0057] As shown in Figure 12 , in some embodiments of the present application, the valve core 101 is provided with an axial balance hole 101a, and the nut 108 comprises a matching part which is at least partially located inside the balance hole 101a, and a first gap c1 is formed between the peripheral wall of the matching part and the inner wall of the balance hole 101a, the first gap c1 forms at least part of the third channel c, and the other area inside the balance hole 101a except the area where the matching part is located forms the first channel a.
[0058] The direction indicated by the arrow in the figure is the flow direction of the refrigerant, and it can be seen that the refrigerant can flow out from the upper end of the valve core 101 in turn through the first channel a, the first gap c1, and the second gap c2, and the first gap c1 realizes the communication of the first channel a and the second channel b.
[0059] As shown in Figure 13 , the valve core 101 is provided with a limiting groove (not shown in the figure) radially opposite to one end of the valve port A, and the peripheral wall of the nut 108 is provided with a limiting protrusion 108a radially opposite to the limiting groove, the limiting protrusion 108a passes through the inside of the corresponding limiting groove, and a second gap c2 is formed between the limiting protrusion 108a and the closed end wall of the limiting groove, the second gap c2 is communicated with the first gap c1, and the second gap c2 forms part of the third channel c.
[0060] The direction indicated by the arrow in the figure is the flow direction of the refrigerant, and it can be seen that the refrigerant can also flow out from the inside of the valve core 101 in turn through the first channel a, the first gap c1, and the second gap c2 along the radial direction, and the first gap c1 and the second gap c2 together realize the communication of the first channel a and the second channel b.
[0061] In summary, the refrigerant has two flow paths to flow out from the inside of the valve core 101.
[0062] Please continue to refer to Figures 1-3 In the embodiment, the electronic expansion valve further comprises a valve seat 105, the valve core sleeve 102 is fixedly connected to the valve seat 105, the valve seat 105 has an inner cavity 105a, an axially extending first through hole is arranged on a lower end wall of the valve seat 105, an inner end of the first through hole is communicated with the inner cavity 105a, the inner end of the first through hole forms a valve port A, a transversely extending second through hole is arranged on a peripheral wall of the valve seat 105, an inner end of the second through hole is communicated with the inner cavity 105a, the electronic expansion valve further comprises a first connecting pipe 106 and a second connecting pipe 107, an inner end of the first connecting pipe 106 is inserted into the first through hole, an inner end of the second connecting pipe 107 is inserted into the second through hole, an outer end of the first connecting pipe 106 forms a first port, an outer end of the second connecting pipe 107 forms a second port, the first port is axially opposite to the valve port A, one of the first port and the second port forms a fluid inlet I, and the other forms a fluid outlet O.
[0063] Further, in the embodiment, the electronic expansion valve further comprises a nut 108, a check ring 109, a screw rod 110, a rotor 111, an external coil 112 and a limiting seat 113, wherein:
[0064] The nut 108 and the valve core 101 are fixedly connected through the check ring 109, the screw rod 110 and the rotor 111 are fixedly connected, the screw rod 110 and the nut 108 are threadedly matched, the screw rod 110 is rotatably installed in the limiting seat 113 through a bearing, the external coil 112 is located at an outer periphery of the rotor 111, and the rotor 111 can be excited to rotate under the driving action of the external coil 112; the limiting seat 113 is connected to an end of the valve core sleeve 102 away from the valve seat 105, a limiting groove 113a is arranged on a peripheral wall of the limiting seat 113, a limiting protrusion 108a is correspondingly arranged on a peripheral wall of the nut 108, the nut 108 is partially located inside the limiting seat 113, the limiting protrusion 108a is inserted into the corresponding limiting groove 113a, the limiting protrusion 108a is inserted into the corresponding limiting groove 113a, and the limiting protrusion 108a is inserted into the corresponding limiting groove 113a, thereby achieving the circumferential limiting of the nut 108, so that the nut 108 can only move axially under the thread matching action with the screw rod 110, thereby driving the valve core 101 to move axially.
[0065] The above is only the preferred embodiment of the present application, and it should be pointed out that, for those skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, which should also be regarded as the protection scope of the present application.
Claims
1. An electronic expansion valve characterized by, The electronic expansion valve includes a valve port (A), a fluid inlet (I), and a fluid outlet (O). It comprises a valve core (101), a valve core sleeve (102), and a nut (108). The valve core (101) has a first channel (a), and a portion of the valve core (101) is disposed inside the valve core sleeve (102). A second channel (b) exists between the outer wall of the valve core (101) and the inner wall of the valve core sleeve (102). The valve core (101) is limitedly connected to the nut (108), and a third channel (c) exists between the nut (108) and the valve core (101). The valve core (101) has a valve port mating portion (101A), and the valve core (101) is axially movable relative to the valve core sleeve (102). The electronic expansion valve has a closed position, in which the valve port mating part (101A) and the valve port part (A) are sealed together, and the fluid inlet (I), the fluid outlet (O), the first channel (a), the second channel (b) and the third channel (c) are connected.
2. The electronic expansion valve according to claim 1, characterized in that The outer wall of the valve core (101) and the inner wall of the valve core sleeve (102) are fitted with a clearance.
3. The electronic expansion valve according to claim 2, wherein It also includes a sealing component disposed between the outer wall of the valve core (101) and the inner wall of the valve core sleeve (102). The sealing component seals a circumferential portion of the area between the valve core (101) and the valve core sleeve (102). Apart from the sealing area of the sealing component, the remaining circumferential area forms a portion of the area of the second channel (b).
4. The electronic expansion valve according to claim 3, wherein The sealing component includes a sealing ring (103) that is circumferentially broken. The sealing ring (103) forms an opening groove (103a) at the break. The sealing ring (103) is installed between the valve core (101) and the valve core sleeve (102). The sealing ring (103) circumferentially seals the area between the valve core (101) and the valve core sleeve (102) except for the opening groove (103a). A portion of the second channel (b) is formed inside the opening groove (103a).
5. The electronic expansion valve according to claim 4, characterized in that One of the outer wall of the valve core (101) and the inner wall of the valve core sleeve (102) is provided with an annular groove, and the sealing ring (103) is installed inside the annular groove.
6. The electronic expansion valve according to claim 3, wherein The outer wall of the valve core (101) is provided with a concave flow groove (d), which extends axially. The sealing component includes an annular sealing ring (104), which is installed between the valve core (101) and the valve core sleeve (102). The annular sealing ring (104) is located within the axial range of the flow groove (d). The annular sealing ring (104) seals the area between the valve core (101) and the valve core sleeve (102) circumferentially, excluding the flow groove (d). A portion of the flow groove (d) forms the second channel (b).
7. Electronic expansion valve according to any of claims 1-6, characterized in that The valve core (101) is provided with a balance channel (101a) extending axially. The nut (108) includes a mating part, which is at least partially located inside the balance channel (101a). A first gap (c1) is formed between the peripheral wall of the mating part and the inner wall of the balance channel (101a). The first gap (c1) forms at least a portion of the third channel (c). The area inside the balance channel (101a) other than the area where the mating part is located forms the first channel (a).
8. The electronic expansion valve according to claim 7, characterized in that The valve core (101) has a limiting groove radially opposite to one end away from the valve port (A), and the nut (108) has a limiting protrusion (108a) radially opposite to the circumferential wall. The limiting protrusion (108a) passes through the corresponding limiting groove. There is a second gap (c2) between the closed end wall of the limiting groove and the limiting protrusion (108a). The second gap (c2) communicates with the first gap (c1). The second gap (c2) forms a part of the third channel (c).
9. The electronic expansion valve according to any one of claims 1-6, characterized in that, The valve core (101) includes a large-diameter section (1011) and a small-diameter section (1012) connected axially. The large-diameter section (1011) is located at one end near the valve port (A), and the diameter of the small-diameter section (1012) is equal to the diameter of the valve port (A).
10. The electronic expansion valve according to any one of claims 1-6, characterized in that, The minimum flow area of the second channel (b) is 1%-10% of the flow area of the valve port (A).