Coil device and electronic expansion valve
Patent Information
- Application Number
- CN202521725473.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-13
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2035-08-13
AI Technical Summary
[0005] The above technical solution has the following advantages: Since no encapsulating component is provided between the first and second claw poles, that is, there is no need to fill the space between the first and second claw poles with resin material during injection molding. Because there is no need to inject resin material between the small gaps of the claw poles, the injection pressure during the injection molding process is correspondingly reduced. On the one hand, the impact force of the flowing resin material on the stator winding is smaller, and the risk of wire breakage or damage during injection molding is lower. On the other hand, injection molding efficiency is improved.
Smart Images
Figure CN224756453U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of flow control, and more specifically, to a coil device and an electronic expansion valve for refrigeration / heating systems in the fields of air conditioners, heat pump water heaters, chillers, vending machines, ice makers, supermarket freezers, and refrigerators. Background Technology
[0002] The coil device of the electronic expansion valve includes a stator winding. In order to ensure the service life of the coil device, it is usually encapsulated by resin material injection molding to form an encapsulation part. During the injection molding process, the flowing resin material will exert a certain impact force on the stator winding. When the injection pressure is too high, it is easy to cause the wires to break, which will reduce the product yield of the electronic expansion valve.
[0003] When copper-clad aluminum or aluminum is used to manufacture the stator winding conductors, the tensile strength of the copper-clad aluminum or aluminum conductors is lower than that of commonly used copper conductors. This increases the risk of conductor breakage or damage during injection molding, and significantly reduces the yield rate of electronic expansion valves. Utility Model Content
[0004] This application provides a coil device for use in an electronic expansion valve. The coil device includes a stator assembly and an encapsulation component. The stator assembly includes a first electromagnetic pole plate, a second electromagnetic pole plate, and a stator winding. The first and second electromagnetic pole plates are disposed on the outer periphery of the stator winding. The conductor of the stator winding is copper-clad aluminum or aluminum. The first electromagnetic pole plate includes multiple first claw poles, and the second electromagnetic pole plate includes multiple second claw poles. The first and second claw poles are alternately arranged along the circumference of the stator winding. The encapsulation component is injection molded from resin material and encapsulates a portion of the stator assembly. No encapsulation component is disposed between the first and second claw poles.
[0005] The above technical solution has the following advantages: Since no encapsulating component is provided between the first and second claw poles, that is, there is no need to fill the space between the first and second claw poles with resin material during injection molding. Because there is no need to inject resin material between the small gaps of the claw poles, the injection pressure during the injection molding process is correspondingly reduced. On the one hand, the impact force of the flowing resin material on the stator winding is smaller, and the risk of wire breakage or damage during injection molding is lower. On the other hand, injection molding efficiency is improved.
[0006] This application provides an electronic expansion valve, comprising: The valve body has a valve port; A coil device is installed on the outer periphery of the valve body, and the stator winding of the coil device is used to generate an excitation magnetic field; The valve core assembly has an open position for opening the valve port and a closed position for closing the valve port; The rotor assembly, located within the valve body, is configured to drive the valve core assembly to switch between an open position and a closed position under the action of an excitation magnetic field.
[0007] The above technical solution has the following advantages: Since no encapsulation component is provided between the first and second claw poles of the coil assembly, the yield rate is high. Therefore, the electronic expansion valve, including the coil assembly, also has a high yield rate. Attached Figure Description
[0008] To more clearly illustrate the embodiments of this application, the embodiments will be described in detail and explained below with reference to the accompanying drawings.
[0009] Figure 1 This is a structural schematic diagram of a portion of the electronic expansion valve of this application; Figure 2 This is a cross-sectional view of the coil device of this application; Figure 3 This is a cross-sectional view of the wire in this application; Figure 4 This is an isometric sectional view of the coil device of this application.
[0010] Icons: 100-Electronic expansion valve; 11-Stator assembly; 111-Stator winding; 112-Coil frame; 1121-First flange; 1122-Second flange; 1123-Cylinder body; 1131-First electromagnetic pole plate; 1131a-First claw pole; 1132a-Second claw pole; 1132-Second electromagnetic pole plate; 114-Encapsulation; 115-Pin; 20-Valve core assembly; 21-Sleeve; 22-Shaft assembly; 23-Rotor assembly; 24-Nut assembly; 25-Valve seat; 251-Valve port; 3-Wire; 31-Aluminum core; 32-Copper layer; 33-Insulating varnish film; 4-First channel; 5-Second channel; 13-Snap-on; 14-Connecting plate. Detailed Implementation
[0011] To make this application clearer, specific embodiments are described below with reference to the accompanying drawings: Please refer to Figures 1-4This application provides a coil device for use in an electronic expansion valve 100. The coil device includes a stator assembly 11 and an encapsulation member 114. The stator assembly 11 includes a first electromagnetic pole plate 1131, a second electromagnetic pole plate 1132, and a stator winding 111. The first electromagnetic pole plate 1131 and the second electromagnetic pole plate 1132 are disposed on the outer periphery of the stator winding 111. The conductor 3 of the stator winding 111 is made of copper-clad aluminum or aluminum. The first electromagnetic pole plate 1131 includes a plurality of first claw poles 1131a, and the second electromagnetic pole plate 1132 includes a plurality of second claw poles 1132a. The first claw poles 1131a and the second claw poles 1132a are alternately arranged along the circumference of the stator winding 111. The encapsulation member 114 is formed by injection molding of resin material and encapsulates part of the stator assembly 11. However, no encapsulation member 114 is disposed between the first claw poles 1131a and the second claw poles 1132a.
[0012] For example, current can be passed through the stator winding 111 to generate an excitation magnetic field.
[0013] Understandably, the first electromagnetic pole plate 1131 and the second electromagnetic pole plate 1132 are made of magnetically conductive metal. For example, the first electromagnetic pole plate 1131 and the second electromagnetic pole plate 1132 may be made of silicon steel sheet, ferrite or soft magnetic composite material.
[0014] In some embodiments, two stator windings 111 are provided, and the two stator windings 111 are coaxially arranged and stacked along the axial direction of the stator windings 111. Optionally, there are two first electromagnetic pole plates 1131 and two second electromagnetic pole plates 1132, and the first electromagnetic pole plate 1131, the stator windings 111 and the second electromagnetic pole plate 1132 correspond one-to-one.
[0015] In some embodiments, the electronic expansion valve 100 further includes a valve body, a valve core assembly 20, and a rotor assembly 23. The valve body has a valve port 251, the valve core assembly 20 has an open position for opening the valve port 251 and a closed position for closing the valve port 251, and the rotor assembly 23 is configured to drive the valve core assembly 20 to switch between the open position and the closed position under the action of an excitation magnetic field. Exemplarily, the rotor assembly 23 may be a permanent magnet.
[0016] The following explanation uses the electronic expansion valve 100 for regulating refrigerant flow as an example. Of course, the electronic expansion valve 100 can also be used to regulate gas, coolant (such as water), etc.
[0017] In some embodiments, the valve body of the electronic expansion valve 100 includes a first channel 4 and a second channel 5. In the open position, refrigerant can flow into the first channel 4 through the valve port 251 via the second channel 5. In the blocked position, refrigerant cannot flow into the first channel 4 via the second channel 5. Exemplarily, the first channel 4 and the second channel 5 can be formed within the cavity of a pipe, or they can be directly formed as holes formed in the wall of the valve body.
[0018] A claw pole is a special type of motor rotor. The claw pole is used to convert the axial excitation magnetic field generated by the stator winding 111 into a radial excitation magnetic field, thereby facilitating the rotation of the rotor assembly 23.
[0019] Optionally, the first claw pole 1131a and the second claw pole 1132a have similar shapes and dimensions.
[0020] In some embodiments, the valve body includes a housing, which includes a valve seat 25 and a sleeve 21. The valve seat 25 is disposed at one end of the sleeve 21 in the axial direction of the stator winding 111. A valve port 251 is disposed on the valve seat 25. The rotor assembly 23 is located on the inner circumferential side of the sleeve 21, and the stator assembly 11 is sleeved on the outer circumferential side of the sleeve 21. Optionally, both the first claw pole 1131a and the second claw pole 1132a are electrically connected to the sleeve 21. Optionally, there is a gap between both the first claw pole 1131a and the second claw pole 1132a and the sleeve 21. Optionally, the sleeve 21 is a shell-like structure that isolates the stator assembly 11 and the rotor assembly 23. The sleeve 21 reduces the possibility of refrigerant contacting the stator assembly 11. Optionally, the sleeve 21 is made of a metallic material.
[0021] In some embodiments, the electronic expansion valve 100 includes a shaft component 22 and a nut assembly 24, the shaft component 22 being threadedly connected to the nut assembly 24, the nut assembly 24 being mounted on a housing, and a rotor assembly 23 being rotatably disposed within the housing. Rotation of the rotor assembly 23 can drive the shaft component 22 to move closer to or away from the valve port 251 along the axial direction of the stator winding 111, so that the shaft component 22 drives the valve core assembly 20 to switch between an open position and a closed position.
[0022] The first electromagnetic pole plate 1131 and the second electromagnetic pole plate 1132 can be interlocked, and at least part of the stator winding 111 is located between the first electromagnetic pole plate 1131 and the second electromagnetic pole plate 1132, such that any first claw pole 1131a is inserted between two adjacent second claw poles 1132a, so that the first claw pole 1131a and the second claw pole 1132a are alternately arranged along the axial direction of the stator winding 111.
[0023] The encapsulation component 114 can be formed by injection molding. The assembled stator winding 111 and electromagnetic pole plate are placed into the injection mold as inserts and filled with thermoplastic material to form the encapsulation component 114. The stator assembly 11 after injection molding has high structural stability and insulation and waterproof performance.
[0024] In this embodiment, since no encapsulating member 114 is provided between the first claw pole 1131a and the second claw pole 1132a, that is, there is no need to consider filling the space between the first claw pole 1131a and the second claw pole 1132a with resin material during the injection molding process. Because there is no need to inject resin material between the claw poles with a small gap, the injection pressure and resin flow rate during the injection molding process are correspondingly reduced. On the one hand, the impact force of the flowing resin material on the stator winding 111 is smaller, and the risk of wire breakage or damage to the conductor 3 during the injection molding process is lower. On the other hand, injection molding efficiency is improved.
[0025] Furthermore, when filling the space between the claw electrodes with resin material, the injection molding process typically requires high pressure to ensure sufficient filling. However, excessively high injection pressure significantly increases the risk of breakage of the copper-clad aluminum or aluminum wire 3. Simultaneously, this process makes it difficult to precisely control the resin flow position. If overflowing resin protrudes from the mating surface between the claw electrode and the housing, it will hinder the formation of an effective electrical connection, leading to a potential electrical breakdown hazard in the electronic expansion valve 100 during use. This application fundamentally avoids these risks by eliminating the encapsulation element 114 between the first claw electrode 1131a and the second claw electrode 1132a.
[0026] Please refer to Figures 1-4 At at least one end face of the coil assembly at both axial ends, the encapsulation 114 has an annular edge located radially outward from the root of the first claw pole 1131a.
[0027] In some embodiments, the first electromagnetic pole plate 1131 may include a first pole plate and a first claw pole 1131a, and the second electromagnetic pole plate 1132 may include a second pole plate and a second claw pole 1132a. The first pole plate and the second pole plate are spaced apart along the axial direction of the stator winding 111. The root of the first claw pole 1131a is connected to the first pole plate, and the free end of the first claw pole 1131a extends along the axial direction of the stator winding 111 towards the second pole plate. The root of the second claw pole 1132a is connected to the second pole plate, and the free end of the second claw pole 1132a extends along the axial direction of the stator winding 111 towards the first pole plate. Optionally, the width of the first claw pole 1131a gradually decreases from its root to its free end. Optionally, the width of the second claw pole 1132a gradually decreases from its root to its free end.
[0028] In some embodiments, the first electrode plate has a first inner annular surface, and the first claw pole 1131a extends from the first inner annular surface. The encapsulation member 114 does not cover the first inner annular surface. This arrangement increases the exposed area of the first electromagnetic electrode plate 1131, allowing for more direct transmission of the magnetic field and reducing energy loss. Optionally, along the axial direction of the stator winding 111, the first electrode plate has a first surface facing away from the stator winding 111, and the encapsulation member 114 covers a portion of the first surface. This arrangement allows the stator assembly 11 to have higher structural stability while reducing energy loss.
[0029] The absence of an encapsulating element 114 between the roots of two adjacent first claw poles 1131a means that during the injection molding production of the coil device, there is no need to worry about customers' concerns about whether the resin completely fills the roots of the first claw poles 1131a. This eliminates the need to increase the injection pressure or adjust the composition ratio of the injection molding material to increase its flow rate, which could lead to the problem of the wire being broken due to excessive impact force from the flowing resin.
[0030] In this embodiment, since no encapsulation member 114 is provided between the roots of two adjacent first claw poles 1131a and no encapsulation member 114 is provided between the roots of two adjacent second claw poles 1132a, on the one hand, the risk of damage to the conductors of the stator winding 111 due to the impact force of resin with excessive flow rate is reduced. On the other hand, the transmission of magnetic field can be made more direct, reducing energy loss.
[0031] Please refer to Figures 1-4 The distance between adjacent first claw pole 1131a and second claw pole 1132a is L1, which satisfies: 0.9mm≤L1≤1.5mm.
[0032] Along the circumferential direction of the stator winding 111, the first claw pole 1131a has a first surface facing the second claw pole 1132a, and the second claw pole 1132a has a second surface facing the first claw pole 1131a. The distance between adjacent first claw poles 1131a and second claw poles 1132a can be the minimum distance between the first surface and the second surface.
[0033] The distance between adjacent first claw poles 1131a and second claw poles 1132a can be any one of 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm or any two of them.
[0034] In this embodiment, setting the distance between the first claw pole 1131a and the second claw pole 1132a within a reasonable range allows the electronic expansion valve 100 to achieve both high magnetic field strength and response speed. Furthermore, by not providing an encapsulating member 114 between the relatively small-distance first claw pole 1131a and the second claw pole 1132a, the risk of damage or breakage of the stator winding 111 due to increased injection pressure caused by filling a small space with injection material during injection molding can be eliminated, significantly improving the yield of the electronic expansion valve 100.
[0035] Please refer to Figures 1-4 The thickness of the first claw electrode 1131a is L2, and the thickness of the second claw electrode 1132a is L3, satisfying: 0.7mm≤L2≤1.1mm, 0.7mm≤L3≤1.1mm.
[0036] The thickness of the first claw pole 1131a can be any one of 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm or any value between two of them.
[0037] The thickness of the second claw pole 1132a can be any one of 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm or any value between two of them.
[0038] In this embodiment, by setting the thickness of the first claw electrode 1131a and the second claw electrode 1132a within a reasonable range, the electronic expansion valve 100 can achieve both high magnetic field strength and response speed. Furthermore, by not providing an encapsulating member 114 between the closely spaced first claw electrodes 1131a and second claw electrodes 1132a, the risk of increased stator winding 111 damage or breakage due to increased injection pressure or adjusted material composition to increase flow rate during injection molding is eliminated, significantly improving the yield of the electronic expansion valve 100.
[0039] Please refer to Figures 1-4 The conductor 3 comprises an aluminum core 31, a copper layer 32, and an insulating varnish film 33. The copper layer 32 is wrapped around the outside of the aluminum core 31, and the insulating varnish film 33 is wrapped around the outside of the copper layer 32. The resistivity of the conductor 3 is ρ, and the outer diameter of the copper layer 32 of the conductor 3 is d, satisfying: 0.02251Ω•mm. 2 / m≤ρ≤0.029Ω•mm 2 / m, 0.15mm≤d≤0.19mm.
[0040] For example, the copper layer 32 and the aluminum core 31 can form a dense interatomic bond during the forging and drawing process of the copper-clad aluminum base material to form an indivisible whole.
[0041] The resistivity of wire 3 can be 0.02251 Ω•mm.2 / m, 0.023Ω•mm 2 / m, 0.0235Ω•mm 2 / m, 0.024Ω•mm 2 / m, 0.0245Ω•mm 2 / m, 0.025Ω•mm 2 / m, 0.0255Ω•mm 2 / m, 0.026Ω•mm 2 / m, 0.0265Ω•mm 2 / m, 0.027Ω•mm 2 / m, 0.0275Ω•mm 2 / m, 0.028Ω•mm 2 / m, 0.0285Ω•mm 2 / m, 0.029Ω•mm 2 The point value of any one of / m or the point value between any two of them.
[0042] Taking copper-clad aluminum conductor 3 or aluminum conductor 3 instead of copper conductor 3 as an example, when ρ≥0.02251Ω•mm 2 When ρ = 0.029Ω•mm, conductor 3 has a lighter mass. 2 When the current is 0.02251 Ω•mm, conductor 3 has better conductivity. Therefore, when the current is 0.02251 Ω•mm... 2 / m≤ρ≤0.029Ω•mm 2 At a speed of / m, conductor 3 can achieve both good conductivity and light weight.
[0043] The outer diameter of the copper layer 32 of the conductor 3 can be any one of 0.15mm, 0.155mm, 0.16mm, 0.165mm, 0.17mm, 0.175mm, 0.18mm, 0.185mm, or 0.19mm, or any value between two of them.
[0044] In some embodiments, the correspondence between the outer diameter of the copper layer 32 of the conductor 3 and the outer diameter of the conductor 3 including the enamel film is as follows: 0.14 mm (outer diameter of the copper layer 32 of the conductor 3) corresponds to 1.16 mm (outer diameter of the conductor 3 including the enamel film), 0.16 mm (outer diameter of the copper layer 32 of the conductor 3) corresponds to 0.182 mm (outer diameter of the conductor 3 including the enamel film), 0.17 mm (outer diameter of the copper layer 32 of the conductor 3) corresponds to 0.194 mm (outer diameter of the conductor 3 including the enamel film), and 0.18 mm (outer diameter of the copper layer 32 of the conductor 3) corresponds to 0.204 mm (outer diameter of the conductor 3 including the enamel film).
[0045] In this embodiment, the conductor 3, which includes an aluminum core 31, a copper layer 32, and an insulating varnish film 33, can achieve a good balance of conductivity, light weight, and good insulation performance.
[0046] Please refer to Figures 1-4 The stator assembly 11 includes a coil frame 112, and a stator winding 111 is wound around the coil frame 112. The coil frame 112 includes a cylindrical portion 1123, a first flange portion 1121, and a second flange portion 1122. The cylindrical portion 1123 connects the first flange portion 1121 and the second flange portion 1122. The first flange portion 1121 and the second flange portion 1122 are spaced apart along the axial direction of the stator winding 111, and the stator winding 111 is wound around the cylindrical portion 1123. The encapsulating member 114 fills the gap between the first flange portion 1121, the second flange portion 1122, the first electromagnetic pole plate 1131, and the stator winding 111.
[0047] In some embodiments, there is a first gap between two adjacent first claw poles 1131a, and a portion of the coil frame 112 is exposed in the first gap.
[0048] In some embodiments, there is a second gap between two adjacent second claw poles 1132a, and a portion of the coil frame 112 is exposed in the second gap.
[0049] In some embodiments, there is a third gap between adjacent first claw poles 1131a and second claw poles 1132a, and a portion of the coil frame 112 is exposed in the third gap.
[0050] Optionally, the first gap, the second gap, and the third gap are interconnected.
[0051] In some embodiments, the first electromagnetic pole plate 1131 may include a first pole plate and a first claw pole 1131a, and the second electromagnetic pole plate 1132 may include a second pole plate and a second claw pole 1132a. The first pole plate and the second pole plate are spaced apart along the axial direction of the stator winding 111. The root of the first claw pole 1131a is connected to the first pole plate, and the free end of the first claw pole 1131a extends along the axial direction of the stator winding 111 towards the second pole plate. The root of the second claw pole 1132a is connected to the second pole plate, and the free end of the second claw pole 1132a extends along the axial direction of the stator winding 111 towards the first pole plate. The first pole plate abuts against the first flange portion 1121, and the second pole plate abuts against the second flange portion 1122.
[0052] Understandably, there is a gap between the first flange 1121, the second flange 1122, the first electromagnetic pole plate 1131 and the stator winding 111 before encapsulation along the radial direction of the stator winding 111, and the gap is filled by injection molding material after encapsulation.
[0053] In some embodiments, multiple coil frames 112 are provided, and the multiple coil frames 112 are spaced apart along the axial direction of the stator windings 111. Multiple stator windings 111 are provided, and the stator windings 111 correspond one-to-one with the coil frames 112. The encapsulation member 114 fills the gap between two adjacent coil frames 112.
[0054] It should be noted that, since no encapsulation 114 is provided between the first claw pole 1131a and the second claw pole 1132a, the impact force of injection molding will not be transmitted from the coil bobbin 112 to the stator winding 111. The risk of excessive deformation of the coil bobbin 112 is low.
[0055] It should be noted that, since the resistivity of copper-clad aluminum conductors 3 and aluminum conductors 3 is greater than that of commonly used copper conductors 3, the diameter of either the copper-clad aluminum conductors 3 or the aluminum conductors 3 may be increased to maintain a constant resistance in the stator winding 111. With the specifications of the first electromagnetic plate 1131 and the second electromagnetic plate 1132 remaining unchanged, the distance between the first electromagnetic plate 1131 and the stator winding 111 will be correspondingly reduced. Compared to air insulation, filling the gap with the encapsulating element 114 can significantly reduce the risk of electrical breakdown between the stator winding 111 and the first electromagnetic plate 1131.
[0056] In this embodiment, the encapsulation 114 fills the gap between the first flange 1121, the second flange 1122, the first electromagnetic pole plate 1131, and the stator winding 111, enabling the stator assembly 11 to possess high structural stability. Furthermore, the injection molding material can improve the insulation performance between the stator winding 111 and the first electromagnetic pole plate 1131, thereby reducing the risk of electrical breakdown between the stator winding 111 and the first electromagnetic pole plate 1131.
[0057] Please refer to Figures 1-4 Along the axial direction of the stator winding 111, the distance between the first flange portion 1121 and the second flange portion 1122 away from the surface of the stator winding 111 is h, which satisfies: 8.8mm≤h≤9.4mm.
[0058] h can also be understood as the height of the coil frame 112.
[0059] Please refer to Figure 2 Along the axial direction of the stator winding 111, the distance h between the first flange portion 1121 and the second flange portion 1122 away from the surface of the stator winding 111 can be the minimum distance between the two surfaces.
[0060] Along the axial direction of the stator winding 111, the maximum dimension of the coil bobbin 112 can be any one of 8.8mm, 8.9mm, 9mm, 9.1mm, 9.2mm, 9.3mm, 9.4mm, or any value between two of them.
[0061] In this embodiment, when h≥8.8mm, more resin material can be filled between the coil frame 112, the first electromagnetic pole plate 1131 and the stator winding 111 to improve the sealing performance of the stator assembly 11; when h≤9.4mm, the stator assembly 11 can have a smaller volume and weight, which is beneficial for the electronic expansion valve 100 to be applied in space-constrained scenarios (such as vehicle air conditioners).
[0062] Please refer to Figures 1-4 The stator assembly 11 also includes a pin 115, which is connected to the coil frame 112 and electrically connected to the stator winding 111, and the encapsulation 114 encapsulates a portion of the pin 115.
[0063] In some embodiments, the pin 115 is electrically connected to the drive controller of the electronic expansion valve 100. After the drive controller is powered on, it sends a pulse drive signal to the stator winding 111. The stator winding 111 is powered on to generate a magnetic field. The first electromagnetic pole plate 1131 and the second electromagnetic pole plate 1132 converge and amplify the magnetic field, driving the rotor assembly 23 to rotate forward or reverse, thereby driving the valve core assembly 20 to switch between the open position and the blocked position.
[0064] In some embodiments, the pin 115 is located on the outer periphery of the stator winding 111 along the radial direction of the stator winding 111. This arrangement eliminates the need for filling the inside of the stator assembly 11 with resin material, further reducing the risk of damage or breakage of the conductor 3 caused by the resin material flowing inside the stator assembly 111 impacting the stator winding 111.
[0065] In some embodiments, along the radial direction of the stator winding 111, the first electromagnetic pole plate 1131 has a first hole, and the encapsulation member 114 fills the gap between the first hole, the stator winding 111, and the pin 115.
[0066] In some embodiments, the number of pins 115 can be multiple.
[0067] In some embodiments, the pin 115 may be generally L-shaped.
[0068] In some embodiments, the pin 115 is soldered to the inlet terminal of the conductor 3 of the stator winding 111 for electrical connection. Alternatively, the electrical connection can be formed by soldering.
[0069] In this embodiment, since the encapsulation 114 encloses a portion of the pin 115, the pin 115 and the stator winding 111 can be assembled in one injection molding process, which is beneficial to improving the assembly efficiency of the electronic expansion valve 100.
[0070] Please refer to Figures 1-4This application provides an electronic expansion valve 100, which includes a valve body, a stator assembly 11, a valve core assembly 20, and a rotor assembly 23. The valve body has a valve port 251. The stator assembly 11 is mounted on the outer periphery of the valve body and is used to generate an excitation magnetic field. The valve core assembly 20 has an open position for opening the valve port 251 and a closed position for closing the valve port 251. The rotor assembly 23 is located within the valve body and is configured to drive the valve core assembly 20 to switch between the open position and the closed position under the action of the excitation magnetic field.
[0071] In some embodiments, the electronic expansion valve 100 includes a shaft component 22 and a nut assembly 24, the shaft component 22 being threadedly connected to the nut assembly 24, the nut assembly 24 being mounted in a housing, and a rotor assembly 23 being rotatably disposed within the housing. Rotation of the rotor assembly 23 drives the shaft component 22 to move closer to or further away from the valve port 251 along the axial direction of the stator winding 111, thereby causing the shaft component 22 to switch the valve core assembly 20 between an open position and a closed position. Exemplarily, the valve core assembly 20 may include a valve needle; optionally, the valve needle may be directly connected to the shaft component 22. Alternatively, please refer to... Figure 2 The valve needle can also be indirectly connected to the shaft component 22, for example, through a transmission connection via a spring or other components.
[0072] In some embodiments, the coil assembly may be connected to the valve body by fasteners such as bolts and screws.
[0073] In this embodiment, since the stator assembly 11 has a high yield rate, the electronic expansion valve 100, which includes the coil device, also has a high yield rate.
[0074] Please refer to Figures 1-4 The outer periphery of the encapsulation 114 is fitted with a buckle 13, and the outer periphery of the valve body is provided with a connecting plate 14, which is engaged with the connecting plate 14.
[0075] For example, the connecting plate 14 may abut against the encapsulation member 114 or may be spaced apart from the encapsulation member 114.
[0076] In some embodiments, the connecting plate 14 includes a first connecting portion and a second connecting portion arranged at an angle. The first connecting portion is fixedly connected to the valve body, and the second connecting portion abuts against the encapsulation member 114. The latch 13 includes a third connecting portion and a snap-fit portion. The third connecting portion is fixedly connected to the encapsulation member 114, and the snap-fit portion snaps into the second connecting portion. With this arrangement, the second connecting portion can be pre-positioned on the stator assembly 11 during assembly, improving assembly convenience.
[0077] In this embodiment, the stator assembly 11 is installed on the valve body by the snap-fit 13 and the connecting plate 14, which is convenient and efficient.
[0078] The above examples illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely illustrative and are intended to aid in understanding the technical solutions and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.
Claims
1. A coil device for use in an electronic expansion valve, characterized in that, The stator assembly (11) includes a stator assembly (11) and an encapsulation member (114). The stator assembly (11) includes a first electromagnetic pole plate (1131), a second electromagnetic pole plate (1132), and a stator winding (111). The first electromagnetic pole plate (1131) and the second electromagnetic pole plate (1132) are disposed on the outer periphery of the stator winding (111). The conductor (3) of the stator winding (111) is copper-clad aluminum or aluminum. The first electromagnetic pole plate (1131) includes a plurality of first claw poles (1131a), and the second electromagnetic pole plate (1132) includes a plurality of second claw poles (1132a). Along the circumference of the stator winding (111), the first claw poles (1131a) and the second claw poles (1132a) are alternately arranged. The encapsulation member (114) is formed by injection molding of resin material and encapsulates part of the stator assembly (11). The encapsulation member (114) is not provided between the first claw pole (1131a) and the second claw pole (1132a).
2. The coil device according to claim 1, characterized in that, At at least one end face at both axial ends of the coil assembly, the encapsulation (114) has an annular edge along the radial direction of the coil assembly, the annular edge being located outside the root of the first claw pole (1131a).
3. The coil device according to claim 2, characterized in that, The distance between adjacent first claw poles (1131a) and second claw poles (1132a) is L1, which satisfies: 0.9mm≤L1≤1.5mm.
4. The coil device according to claim 3, characterized in that, The thickness of the first claw pole (1131a) is L2, and the thickness of the second claw pole (1132a) is L3, satisfying: 0.7mm≤L2≤1.1mm, 0.7mm≤L3≤1.1mm.
5. The coil device according to any one of claims 1-4, characterized in that, The conductor (3) includes an aluminum core (31), a copper layer (32), and an insulating varnish film (33). The copper layer (32) is wrapped around the outside of the aluminum core (31), and the insulating varnish film (33) is wrapped around the outside of the copper layer (32). The resistivity of the conductor (3) is ρ, and the outer diameter of the copper layer (32) of the conductor (3) is d, satisfying: 0.02251Ω. mm 2 / m≤ρ≤0.029Ω mm 2 / m, 0.15mm≤d≤0.19mm.
6. The coil device according to claim 5, characterized in that, The stator assembly (11) includes a coil frame (112), which includes a cylindrical portion (1123), a first flange portion (1121), and a second flange portion (1122). The cylindrical portion (1123) connects the first flange portion (1121) and the second flange portion (1122). The first flange portion (1121) and the second flange portion (1122) are spaced apart along the axial direction of the stator winding (111), and the stator winding (111) is wound around the cylindrical portion (1123). The encapsulation (114) fills the gap between the first flange (1121), the second flange (1122), the first electromagnetic pole plate (1131), and the stator winding (111).
7. The coil device according to claim 6, characterized in that, Along the axial direction of the stator winding (111), the distance between the first flange portion (1121) and the second flange portion (1122) away from the surface of the stator winding (111) is h, which satisfies: 8.8mm≤h≤9.4mm.
8. The coil device according to claim 6, characterized in that, The stator assembly (11) includes a pin (115) connected to the coil bobbin (112) and electrically connected to the stator winding (111), and the encapsulation (114) encapsulates a portion of the pin (115).
9. An electronic expansion valve, characterized in that, include: Valve body, having valve port (251); The coil device as described in any one of claims 1-8 is installed on the outer periphery of the valve body, and the stator winding (111) of the coil device is used to generate an excitation magnetic field; The valve core assembly (20) has an open position for opening the valve port (251) and a blocked position for blocking the valve port (251); A rotor assembly (23) is located within the valve body and is configured to drive the valve core assembly (20) to switch between the open position and the blocked position under the action of an excitation magnetic field.
10. The electronic expansion valve according to claim 9, characterized in that, The outer periphery of the encapsulation component (114) is fitted with a buckle (13), and the outer periphery of the valve body is provided with a connecting plate (14), and the buckle (13) is engaged with the connecting plate (14).