Coil assembly of electronic expansion valve, electronic expansion valve and refrigeration equipment

Abstract

The utility model discloses a coil assembly of an electronic expansion valve, the electronic expansion valve and refrigeration equipment, and relates to the technical field of electronic expansion valves, the coil assembly is sleeved outside a valve body of the electronic expansion valve, and the coil assembly comprises a stator assembly, an electrical connecting piece and an injection molding packaging body. The stator assembly comprises a stator shell, a framework, a winding and a contact pin, the framework is arranged in the stator shell, the winding is wound on the framework, and the contact pin is connected to the winding; the electrical connecting piece comprises a wire, and the wire is connected with the contact pin; the injection molding packaging body is filled in a gap between the stator shell and the winding, the injection molding packaging body wraps the contact pin and at least part of the lead, the length of the lead wrapped by the injection molding packaging body is L, and L is greater than or equal to 5mm. The technical scheme provided by the utility model is used for simplifying the manufacturing process and ensuring the insulating property.

Description

Technical Field

[0001] This utility model relates to the field of electronic expansion valve technology, and in particular to an electronic expansion valve coil assembly, an electronic expansion valve, and a refrigeration device. Background Technology

[0002] Electronic expansion valves are an important component of refrigeration equipment such as air conditioners. Currently, electronic expansion valves on the market consist of a valve body, a coil, and a rotor. The coil, when powered, generates a magnetic field, which rotates the rotor, thereby adjusting the valve opening. The coil includes windings and leads, and it needs to be electrically insulated from the outside. In current coil manufacturing processes, after the windings are completed, injection molding is performed. After the stator pins and leads are connected, epoxy resin, polyurethane, or other potting adhesives are used to insulate the leads. Existing coil encapsulation processes are complex, and ensuring insulation performance is difficult. Utility Model Content

[0003] The main purpose of this invention is to provide a coil assembly for an electronic expansion valve, which solves the problems of complex electrical insulation processes and difficulty in guaranteeing insulation performance of the coil assembly windings and wires in electronic expansion valves.

[0004] To achieve the above objectives, this utility model proposes a coil assembly for an electronic expansion valve, the coil assembly comprising:

[0005] A stator assembly, comprising a stator housing, a frame, windings, and pins, wherein the frame is disposed within the stator housing, the windings are wound around the frame, and the pins are connected to the windings;

[0006] An electrical connector, the electrical connector including a wire connected to the pin;

[0007] An injection-molded package is filled in the gap between the stator housing and the winding, and the injection-molded package covers the pin and at least part of the wire, the length of the wire covered by the injection-molded package being L, where L≥5mm.

[0008] In one embodiment, the electrical connector further includes a sheath, the wire passing through the sheath and extending out of the sheath, and the injection-molded package covering at least a portion of the sheath.

[0009] In one embodiment, the length of the injection-molded package covering the sheath is M, where 1mm ≤ M ≤ 5mm.

[0010] In one embodiment, the skeleton is provided with a mounting part, the pin is inserted into the mounting part, and the injection-molded package covers the mounting part.

[0011] In one embodiment, the injection-molded package covers the entire stator assembly.

[0012] In one embodiment, the stator assembly includes a first stator assembly and a second stator assembly stacked axially, and the injection-molded package further covers at least a portion of the first stator assembly and the second stator assembly.

[0013] In one embodiment, the coil assembly further includes a snap fastener for engaging with a mounting bracket on the valve body of the electronic expansion valve.

[0014] In one embodiment, the coil assembly further includes a snap fastener integrally formed with the injection-molded package.

[0015] In one embodiment, the electrical connector extends in a direction parallel to the axial direction of the stator housing; or, the electrical connector extends in a direction perpendicular to the axial direction of the stator housing.

[0016] In one embodiment, the conductor has an insulating sheath made of cross-linked polyvinyl chloride (XLPVC); and / or, the sheath is made of cross-linked polyvinyl chloride (XLPVC).

[0017] This invention also proposes an electronic expansion valve, including the aforementioned coil assembly.

[0018] This utility model also proposes a refrigeration device, including the aforementioned electronic expansion valve.

[0019] The electronic expansion valve of this utility model has an integrally molded encapsulated body at the connection position between the coil assembly outside the winding and the pin and the wire. The length of the wire covered by the injection-molded encapsulated body is L, where L≥5mm, which simplifies the manufacturing process and ensures the insulation performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A cross-sectional structural schematic diagram of an embodiment of the electronic expansion valve provided by this utility model;

[0022] Figure 2 A schematic diagram of the structure of an embodiment of the coil assembly provided by this utility model;

[0023] Figure 3 A partial structural schematic diagram of the coil assembly provided by this utility model;

[0024] Figure 4 A schematic diagram of the skeleton of the coil assembly provided by this utility model;

[0025] Figure 5 A schematic diagram of the structure of the electrode shell of the coil assembly provided by this utility model;

[0026] Figure 6 A schematic diagram of the electromagnetic pole plate of the coil assembly provided by this utility model;

[0027] Figure 7 A cross-sectional structural schematic diagram of another embodiment of the electronic expansion valve provided by this utility model.

[0028] Explanation of icon numbers:

[0029] 1. Electronic expansion valve; 10. Coil assembly; 11. Stator assembly; 11a. First stator assembly; 11b. Second stator assembly; 111. Frame; 1111. Mounting part; 112. Winding; 113. Pin; 114. Stator housing; 1141. Electrode housing; 11411. First support leg; 1142. Electromagnetic electrode plate; 11421. Second support leg; 12. Electrical connector; 121. Wire; 122. Sheath; 13. Injection molded encapsulation body; 14. Buckle; 20. Valve body; 30. Fixing bracket; 40. Connecting pipe. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] Electronic expansion valves play a crucial role in refrigeration systems, especially air conditioning systems. The coil of an electronic expansion valve is energized to generate a magnetic field, which in turn drives a rotor inside the valve body to rotate, thus adjusting the valve opening. The coil requires an external AC power supply. Commercially available coils connect to the AC power supply via leads. Currently, coil manufacturing involves injection molding around the windings, and the stator pins and lead connections are encapsulated with epoxy resin, polyurethane, or other potting adhesives. This process of injection molding followed by encapsulation to electrically insulate the coil is complex, and the two different encapsulation processes make it difficult to guarantee insulation performance.

[0034] Therefore, this application solves the above problems by optimizing the structure of the coil assembly.

[0035] Please refer to Figure 1 , Figure 2 and Figure 3 As shown in the figure, an embodiment of this application provides a coil assembly 10 for an electronic expansion valve 1, which is sleeved on the outer periphery of the valve body 20 of the electronic expansion valve 1. The coil assembly 10 includes a stator assembly 11, an electrical connector 12, and an injection-molded package 13. The stator assembly 11 includes a frame 111, a winding 112, a pin 113, and a stator housing 114. The frame 111 is disposed inside the stator housing 114, the winding 112 is wound on the frame 111, and the pin 113 is connected to the winding 112. The electrical connector 12 includes a wire 121, which is connected to the pin 113. The injection-molded package 13 fills the gap between the stator housing 114 and the winding 112, and the injection-molded package 13 covers the pin 113 and at least part of the wire 121. The length of the wire 121 covered by the injection-molded package 13 is L, and the value of L satisfies L≥5mm.

[0036] Specifically, the coil assembly 10 of this application is used in an electronic expansion valve 1. The electronic expansion valve 1 includes the coil assembly 10 and a valve body 20. The coil assembly 10 is sleeved outside the valve body 20. When the coil assembly 10 is energized, it drives the rotor inside the valve body 20 to rotate, thereby causing the valve needle on the rotor to move up and down relative to the valve orifice, so as to change the flow area inside the valve orifice. The flow area of ​​the electronic expansion valve 1 changes as the valve needle moves up and down inside the valve orifice. When the flow area changes, the amount of refrigerant flowing through the valve orifice also changes.

[0037] The stator assembly 11 includes a frame 111, a winding 112, pins 113, and a stator housing 114. The stator housing 114 is annular in shape and has an annular receiving cavity inside. The frame 111 is disposed within the receiving cavity, and the winding 112 is wound on the frame 111. The pins 113 are disposed outside the stator housing 114 and are electrically connected to the winding 112. An electrical connector 12 is disposed outside the stator assembly 11 and includes a wire 121, which is electrically connected to the pins 113. The electrical connector 12 is used to connect to an external power source to provide electrical energy to the winding 112, thereby generating an alternating magnetic field through the winding 112, which drives the rotor inside the valve body 20 to rotate. The injection-molded package 13 is integrally injection molded outside the winding 112 (i.e., in the gap between the stator housing 114 and the winding 112) and in the connection area between the pin 113 and the wire 121, so as to integrally connect the wire 121 of the stator assembly 11 and the electrical connector 12, and maintain the electrical insulation between the coil assembly 10 and the outside world.

[0038] During manufacturing, the winding 112 is first wound onto the frame 111. Then, the frame 111 with the winding 112 is placed inside the receiving cavity of the stator housing 114. The wire 121 and the pin 113 are connected. The stator assembly 11 and the electrical connector 12 are pre-embedded in the corresponding injection molding machine. Subsequently, the stator assembly 11 and the electrical connector 12 are integrally injection molded to form an injection-molded package 13. The stator housing 114 has an opening to allow liquid material to pass through and fill the outside of the winding 112, such that the portion of the injection-molded package 13 outside the stator assembly 11 covers the connection area between the pin 113 and the wire 121. The length of the injection-molded package 13 covering the wire 121 is L, where L ≥ 5 mm. In this application, the connection area between the wire 121 and the pin 113 and the outside of the winding 112 are both integrally injection molded to form the injection-molded package 13. Compared to existing technologies that first injection mold the exterior of winding 112 and then pot the pins 113 and lead wires with epoxy resin, polyurethane, or other potting adhesives, the existing technology is complex. Furthermore, while the insulation of winding 112 is achieved through injection molding, the insulation of the connection between conductor 121 and pin 113 is achieved through potting adhesive. These different processes make it difficult to guarantee insulation performance. The technical solution of this application only requires a single injection molding process to achieve electrical insulation of the connection areas of winding 112, conductor 121, and pin 113, simplifying the manufacturing process. It eliminates the need for subsequent potting and curing, shortening the product production cycle. Moreover, this application uses injection molding for insulation uniformly, ensuring stable and excellent insulation performance. The injection-molded package 13 of this application covers the wire 121 for a length of at least 5 mm, which has better electrical insulation performance than the prior art. This design can also increase the stability of the connection between the wire 121 and the pin 113, so as to reduce the possibility of damage during subsequent use, increase the life of the coil assembly 10, and thus also increase the life of the electronic expansion valve 1.

[0039] In an optional embodiment, the electrical connector 12 further includes a sheath 122, through which a wire 121 passes and extends, and an injection-molded package 13 covers at least a portion of the sheath 122.

[0040] Specifically, the electrical connector 12 also includes a sheath 122 sleeved over the conductor 121. The sheath 122 extends along the length of the conductor 121 and is shorter than the conductor 121, allowing the conductor 121 to extend from both ends of the sheath 122. The extended portion of the conductor 121 is electrically connected to the pin 113. In the embodiments of this application, the length of the conductor 121 extending from the end of the sheath 122 is at least 5 mm. The injection-molded encapsulation body 13 completely covers the portion of the conductor 121 extending from the sheath 122 and at least covers a portion of the sheath 122. The injection-molded encapsulation body 13 covering part of the sheath 122 allows the conductor 121 and the sheath 122 to be tightly integrated, making them less prone to damage during use, thereby further increasing the service life of the coil assembly 10.

[0041] In an optional embodiment, the length of the sleeve 122 covered by the injection-molded package 13 is M, where M is 1mm ≤ M ≤ 5mm. A length of 1-5mm for the sleeve 122 covered by the injection-molded package 13 ensures stable connection between the sleeve 122 and the injection-molded package 13 without excessively increasing material costs.

[0042] In an optional embodiment, the conductor 121 has an insulating sheath made of XLPVC material.

[0043] Specifically, XLPVC stands for cross-linked polyvinyl chloride, a specially treated polyvinyl chloride (PVC) material. Cross-linked PVC possesses excellent insulation properties, reducing the risk of electrical fires and improving product safety. Its high heat resistance significantly extends the service life of PVC, enabling it to maintain stable performance in various harsh environments. Compared to traditional PVC materials, cross-linked PVC has a smaller environmental impact during production and use, better meeting societal environmental protection requirements.

[0044] In an optional embodiment, the sheath 122 is also made of XLPVC material.

[0045] In an optional embodiment, the skeleton 111 is provided with a mounting part 1111, the pin 113 is inserted into the mounting part 1111, and the injection molded package 13 covers the mounting part 1111.

[0046] Specifically, please refer to Figure 3 and Figure 4As shown, the frame 111 is used for winding the winding 112. A mounting portion 1111 is integrally formed on one side of the frame 111, meaning the mounting portion 1111 is part of the frame 111. Multiple pins 113 are provided. The mounting portion 1111 has multiple spaced mounting slots, each containing one pin 113. An injection-molded encapsulation body 13 covers the mounting portion 1111 to stably fix the pins 113 to the mounting portion 1111. This application uses integral injection molding to cover the mounting portion 1111 of the frame 111, ensuring that the pins 113 are firmly fixed to the mounting portion 1111 and reducing the risk of the pins 113 falling off.

[0047] In an alternative embodiment, the injection-molded package 13 covers at least a portion of the exterior of the stator assembly 11.

[0048] Specifically, in this embodiment, the injection-molded package 13 also covers the outside of the stator assembly 11, and covers at least a portion of the outside of the stator assembly 11. The stator assembly 11 includes a first stator assembly 11a and a second stator assembly 11b, which are stacked sequentially along their axial direction. Both the first stator assembly 11a and the second stator assembly 11b include a frame 111, a winding 112, and a stator housing 114. The stator housing 114 includes an electrode housing 1141 and an electromagnetic electrode 1142, with the electromagnetic electrode 1142 covering the electrode housing 1141 to form a receiving cavity for accommodating the frame 111. It should be noted that the electrode housing 1141 is a cover-like component (e.g., Figure 5 As shown), multiple first legs 11411 extend from the middle of the electromagnetic plate 1142 towards one side, with the width of the first legs 11411 gradually decreasing to form a triangular structure. Multiple second legs 11421 extend from the middle of the electromagnetic plate 1142 towards the first legs 11411 (as shown). Figure 6 As shown, the width of the second leg 11421 gradually decreases. Multiple first legs 11411 are evenly arranged around the axis of the electromagnetic pole plate 1142, and multiple second legs 11421 are evenly arranged around the axis of the electromagnetic pole plate 1142. The diameter of the circle formed by the first legs 11411 and the circle formed by the second legs 11421 are the same, and the first legs 11411 and the second legs 11421 are staggered.

[0049] Please refer to Figure 2As shown, the injection-molded package 13 also covers at least a portion of the first stator assembly 11a and the second stator assembly 11b. Specifically, the injection-molded package 13 covers the junction of the first stator assembly 11a and the second stator assembly 11b, and the axial length of the package covering the first stator assembly 11a and the second stator assembly 11b is 4 mm or more. The injection-molded package 13 of this application extends to the outside of the stator assembly 11, covering at least a portion of the outside of the stator assembly 11, thus protecting the stator assembly 11, while a portion of the stator assembly 11 is exposed to the outside for heat dissipation. In other embodiments, please refer to... Figure 7 As shown, the injection-molded encapsulation body 13 covers the entire stator assembly 11, thereby providing comprehensive protection for the stator assembly 11.

[0050] In an optional embodiment, the valve body 20 is fitted with a retaining frame 30, and the coil assembly 10 is fastened to the retaining frame 30.

[0051] Specifically, the valve body 20 is a cylindrical structure, and a fixing frame 30 is provided outside the valve body 20. The fixing frame 30 is annular and is sleeved on the outside of the valve body 20. It is used to fix the coil assembly 10. In this embodiment, the coil assembly 10 and the fixing frame 30 are fixed by a snap-fit ​​method, which facilitates the assembly of the two. It should be noted that the coil assembly 10 can also be fixed by other connection methods, such as screw fixing, in which the coil assembly 10 is fixed to the fixing frame 30 by screws.

[0052] In an optional embodiment, the coil assembly 10 further includes a snap-fit ​​14 for engaging with a retainer 30 on the valve body 20 of the electronic expansion valve. The snap-fit ​​14 is integrally formed with the injection-molded package 13.

[0053] Specifically, the coil assembly 10 also includes a snap fastener 14 made of thermoplastic, which is integrally injection molded with the injection-molded package 13. Multiple snap fasteners 14 are arranged evenly around the axis of the valve body 20, and multiple slots are provided on the mounting bracket 30 at positions corresponding to the snap fasteners 14. The snap fasteners 14 engage with the slots to fix the coil assembly 10 onto the mounting bracket 30. In this embodiment, the snap fasteners 14 and the slots cooperate to facilitate the assembly of the coil assembly 10 onto the mounting bracket 30.

[0054] Please refer to Figure 1 As shown, in an optional embodiment, the electrical connector 12 extends in a direction parallel to the axial direction of the stator housing 114.

[0055] Specifically, a connecting pipe 40 is installed at the lower end of the valve body 20. The connecting pipe 40 is a refrigerant pipe used to transport refrigerant. An electrical connector 12 extends axially parallel to the valve body 20 and points upwards. By aligning the electrical connector 12 with the axial direction of the valve body 20, this application reduces additional space requirements, making the valve body 20 more compact. Furthermore, the axially extending electrical connector 12 simplifies installation and maintenance. Technicians can more easily connect or disconnect the wires 121 of the electrical connector 12 to perform necessary inspections or repairs.

[0056] Please refer to Figure 7 As shown, in another optional embodiment, the electrical connector 12 extends in a direction perpendicular to the axis of the valve body 20, i.e. Figure 7 The horizontal direction in the middle.

[0057] This utility model also proposes an electronic expansion valve 1, which includes a valve body 20 and a coil assembly 10. The coil assembly 10 is sleeved outside the valve body 20. When the coil assembly 10 is energized, it generates a magnetic field, which drives the rotor inside the valve body 20 to rotate, and subsequently drives the valve needle mounted on the rotor to rotate, thereby achieving the purpose of controlling the cross-sectional area of ​​the valve orifice, and thus controlling the flow rate of the refrigerant. The coil assembly 10 of the electronic expansion valve 1 of this application includes a stator assembly 11, an electrical connector 12, and an injection-molded package 13. The stator assembly 11 includes a frame 111, a winding 112, a pin 113, and a stator housing 114. The frame 111 is disposed inside the stator housing 114, the winding 112 is wound around the frame 111, and the pin 113 is connected to the winding 112. The electrical connector 12 includes a wire 121, which is connected to the pin 113. The injection-molded package 13 fills the gap between the stator housing 114 and the winding 112, and covers the pin 113 and at least part of the wire 121. The length of the wire 121 covered by the injection-molded package 13 is L, and the value of L satisfies L≥5mm. This application only requires one injection molding to achieve electrical insulation at the connection area of ​​the winding 112, the wire 121 and the pin 113, which simplifies the manufacturing process. It eliminates the need for subsequent potting and curing after injection molding, shortening the product production cycle. The uniform use of injection molding for insulation also ensures stable and good insulation performance.

[0058] This utility model also relates to a refrigeration device, which can be an air conditioner, and the refrigeration device includes the aforementioned electronic expansion valve 1.

[0059] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A coil assembly for an electronic expansion valve, characterized in that, The coil assembly includes: A stator assembly, comprising a stator housing, a frame, windings, and pins, wherein the frame is disposed within the stator housing, the windings are wound around the frame, and the pins are connected to the windings; An electrical connector, the electrical connector including a wire connected to the pin; An injection-molded package is filled in the gap between the stator housing and the winding, and the injection-molded package covers the pin and at least part of the wire, the length of the wire covered by the injection-molded package being L, where L≥5mm.

2. The coil assembly of the electronic expansion valve as described in claim 1, characterized in that, The electrical connector further includes a sheath, the wire passes through the sheath and extends out of the sheath, and the injection-molded package covers at least a portion of the sheath.

3. The coil assembly of the electronic expansion valve as described in claim 2, characterized in that, The length of the injection-molded package covering the sheath is M, where 1mm ≤ M ≤ 5mm.

4. The coil assembly of the electronic expansion valve as claimed in claim 1, characterized in that, The frame is provided with a mounting part, the pin is inserted into the mounting part, and the injection molded package covers the mounting part.

5. The coil assembly of the electronic expansion valve as claimed in claim 1, characterized in that, The injection-molded package covers the entire stator assembly.

6. The coil assembly of the electronic expansion valve as claimed in claim 1, characterized in that, The stator assembly includes a first stator assembly and a second stator assembly stacked axially, and the injection-molded package further covers at least a portion of the first stator assembly and the second stator assembly.

7. The coil assembly of the electronic expansion valve as claimed in claim 1, characterized in that, The coil assembly also includes a clip for engaging with a mounting bracket on the valve body of the electronic expansion valve.

8. The coil assembly of the electronic expansion valve as claimed in claim 7, characterized in that, The buckle is integrally formed with the injection-molded package.

9. The coil assembly of the electronic expansion valve as claimed in claim 1, characterized in that, The electrical connector extends in a direction parallel to the axial direction of the stator housing; or, the electrical connector extends in a direction perpendicular to the axial direction of the stator housing.

10. The coil assembly of the electronic expansion valve as claimed in claim 2, characterized in that, The conductor has an insulating sheath made of cross-linked polyvinyl chloride (XLPVC); and / or, the sheath is made of cross-linked polyvinyl chloride (XLPVC).

11. An electronic expansion valve, characterized in that, It includes a valve body and a coil assembly as described in any one of claims 1-10.

12. A refrigeration device, characterized in that, Includes the electronic expansion valve as described in claim 11.

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