Electromagnetic coil and electronic expansion valve

Abstract

The application relates to an electromagnetic coil and an electronic expansion valve, the electromagnetic coil comprising a shell, a circuit board, a stator assembly and a connector assembly, the shell being provided with an inner cavity, the circuit board being arranged in the inner cavity, the stator assembly and the connector assembly being arranged on the same side of the circuit board, the stator assembly being provided with a first group of pins, the stator assembly being electrically connected to the circuit board through the first group of pins, the shell comprising a main body part and an injection molding part, the main body part being arranged at the outer periphery of the stator assembly, the injection molding part being arranged at the outer periphery of at least part of the first group of pins, the connector assembly being connected to the main body part, and the connector assembly and the injection molding part being arranged along the circumferential direction of the stator assembly. The electromagnetic coil and the electronic expansion valve provided by the application solve the problem that, in the existing electromagnetic coil with a horizontal interface, the length of the connector assembly extending out of the lateral surface of the shell is too large, thereby causing the required installation volume of the entire electromagnetic coil to be too large.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to an electromagnetic coil and an electronic expansion valve. Background Technology

[0002] Currently, electronic expansion valves are commonly installed in refrigeration systems. These valves mainly consist of a valve body and an electromagnetic coil. The electromagnetic coil contains a stator, and the valve body contains a rotor. When the electromagnetic coil is energized and generates a magnetic field, the stator inside the electromagnetic coil can drive the rotor inside the valve body to rotate, thereby moving the valve core and adjusting the refrigerant flow rate at the valve port to achieve higher control precision.

[0003] The electromagnetic coil includes a housing, a circuit board, a stator assembly, and a connector assembly. The circuit board is located on the housing, and the stator assembly and the connector assembly are electrically connected to the circuit board. In existing electromagnetic coils, the pins of the stator assembly and the pins of the connector assembly are located on the same side of the stator assembly. As a result, the lengths of the injection-molded part of the stator assembly (covering the outer periphery of the pins) and the connector assembly overlap, resulting in an excessively large length of the connector assembly extending beyond the outer side of the housing. This leads to an excessively large required installation volume for the entire electromagnetic coil, which is not conducive to the integrated layout design of the electromagnetic coil. Utility Model Content

[0004] Therefore, it is necessary to provide an electromagnetic coil and an electronic expansion valve to solve the problem that in existing electromagnetic coils with horizontal interfaces, the length of the connector extending beyond the outer side of the housing is too large, resulting in an excessively large required installation volume for the entire electromagnetic coil.

[0005] The electromagnetic coil provided in this application includes a housing, a circuit board, a stator assembly, and a connector assembly. The housing has an inner cavity, and the circuit board is disposed in the inner cavity. The stator assembly and the connector assembly are disposed on the same side of the circuit board. The stator assembly has a first set of pins, and the stator assembly is electrically connected to the circuit board through the first set of pins. The housing includes a main body and an injection-molded part. The main body is disposed on the outer periphery of the stator assembly, and the injection-molded part is disposed on the outer periphery of at least a portion of the first set of pins. The connector assembly is connected to the main body, and the connector assembly and the injection-molded part are spaced apart along the circumferential direction of the stator assembly.

[0006] In one embodiment, the connector assembly has a second set of pins, through which the connector assembly is electrically connected to the circuit board;

[0007] The first set of pins is soldered or press-fitted to the circuit board.

[0008] And / or, the second set of pins is soldered or press-fitted to the circuit board.

[0009] In one embodiment, the first set of pins includes a plurality of first pin bodies, the bottom wall of the inner cavity is provided with a first partition strip, one end of the first partition strip away from the bottom wall of the inner cavity extends toward the direction close to the circuit board, and a corresponding first partition strip is provided between adjacent first pin bodies;

[0010] In one embodiment, the second set of pins includes a plurality of second pin bodies, and the bottom wall of the inner cavity is provided with a second partition strip. The end of the second partition strip away from the bottom wall of the inner cavity extends toward the direction close to the circuit board, and a corresponding second partition strip is provided between adjacent second pin bodies.

[0011] In one embodiment, one end of the injection molding part is connected to the main body part, and the other end extends along a first direction toward a direction away from the stator assembly; one end of the connector part is connected to the main body part, and the other end extends along a second direction toward a direction away from the stator assembly, and the included angle A between the first direction and the second direction satisfies 30°≤A≤150°.

[0012] In one embodiment, A is 90°.

[0013] In one embodiment, the electromagnetic coil further includes a grounding pin, one end of which is connected to the stator housing of the stator assembly, and the other end is soldered and electrically connected to a circuit board. Furthermore, an injection-molded portion is disposed on at least a portion of the outer periphery of the grounding pin.

[0014] In one embodiment, the housing has multiple hollowed-out adhesive-reducing cavities inside, which are connected to the inner cavity.

[0015] In one embodiment, the bottom wall of the inner cavity is recessed to form a de-plasticizing cavity, with a portion of the de-plasticizing cavity disposed in the injection molding part and another portion disposed in the connector assembly.

[0016] In one embodiment, the bottom wall of the inner cavity is provided with support columns, and multiple support columns are distributed along the periphery of the circuit board and supported at the lower end of the circuit board.

[0017] In one embodiment, the sidewall of the inner cavity is provided with reinforcing ribs, each reinforcing rib extending in a direction perpendicular to the surface of the circuit board, and multiple reinforcing ribs distributed along the periphery of the inner cavity. The circuit board is provided with clearance openings corresponding to the reinforcing ribs, and the reinforcing ribs are engaged in the corresponding clearance openings.

[0018] In one embodiment, the connector assembly and the housing are integrally injection molded, or the connector assembly and the housing are separate components.

[0019] This application also provides an electronic expansion valve, which includes the electromagnetic coil described in any of the above embodiments.

[0020] Compared with the prior art, the electromagnetic coil and electronic expansion valve provided in this application have a stator assembly and a connector assembly connected to the circuit board surface from the same side after the circuit board is installed inside the housing. The first set of pins of the stator assembly is located in the direction of the first side wall of the housing, and the second set of pins of the connector assembly is located in the direction of the second side wall of the housing, and the two sets of pins (the first set of pins and the second set of pins) are spatially misaligned.

[0021] Compared to existing technologies, traditional horizontal interface solutions concentrate both sets of pins for the connector assembly and stator assembly on the same side of the housing, leading to excessive space congestion on that side and forcing the connector assembly to extend excessively outward. This solution, by arranging the connector assembly and the first housing circumferentially apart from the stator assembly, significantly reduces the length of the connector assembly protruding from the housing, effectively reducing the horizontal installation space requirement for the electromagnetic coil. Furthermore, the optimized layout of the electromagnetic coil components makes it easier to integrate the electromagnetic coil into compact devices, making it particularly suitable for refrigeration system installation scenarios sensitive to lateral space. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of an electromagnetic coil provided in this application. Figure 1 ;

[0024] Figure 2 A schematic diagram of the structure of an electromagnetic coil provided in this application. Figure 2 ;

[0025] Figure 3 A cross-sectional view of an electromagnetic coil provided in an embodiment of this application;

[0026] Figure 4 A partial structural schematic diagram of an electromagnetic coil according to an embodiment provided in this application;

[0027] Figure 5 A schematic diagram of the structure of a stator assembly according to an embodiment of this application;

[0028] Figure 6 A schematic diagram of the circuit board structure provided in this application;

[0029] Figure 7 A schematic diagram of the structure of a cover plate according to an embodiment of this application.

[0030] Reference numerals: 100, housing; 110, inner cavity; 120, injection molding part; 130, de-molding cavity; 140, main body; 200, circuit board; 210, first socket; 220, second socket; 230, third socket; 240, clearance opening; 300, stator assembly; 310, stator housing; 320, first set of pins; 321, first pin body; 330, coil winding; 400, connector assembly; 410, connector housing; 420, second set of pins; 421, second pin body; 500, cover plate; 510, reinforcing mesh; 610, first partition bar; 620, second partition bar; 700, support column; 800, grounding pin; 900, reinforcing rib. Detailed Implementation

[0031] Please see Figures 1-7 In one embodiment, the electromagnetic coil includes a housing 100, a circuit board 200, a stator assembly 300, a connector assembly 400, and a cover plate 500. The housing 100 is an injection molded part and has an inner cavity 110. The circuit board 200 is disposed in the inner cavity 110, and the cover plate 500 covers the opening of the inner cavity 110. The inner side of the cover plate 500 is provided with a plurality of crisscrossing ribs 510 to enhance the structural strength of the cover plate 500.

[0032] The stator assembly 300 and the connector assembly 400 are disposed on the same side of the circuit board 200. The stator assembly 300 is fixedly connected to the housing 100. The stator assembly 300 has a stator housing 310 and a first set of pins 320 electrically connected to the stator housing 310. The stator assembly 300 is inserted into and electrically connected to the circuit board 200 through the first set of pins 320. The connector assembly 400 has a connector housing 410 and a second set of pins 420 fixed to the connector housing 410. One end of the connector assembly 400 is fixedly inserted through the connector housing 410 into the cover plate 500 and is separately disposed from the cover plate 500. The other end is inserted into and electrically connected to the circuit board 200 through the second set of pins 420.

[0033] The housing 100 refers to a support component with a closed structure, which can be manufactured using injection molding, and is used to encapsulate internal components and provide mechanical protection. The inner cavity 110 refers to the cavity formed inside the housing 100, the shape of which matches the contour of the circuit board 200. The circuit board 200 is disposed in the inner cavity 110, specifically fixed by support pillars 700 or a snap-fit ​​structure, and is used to support electronic components and form electrical connections. The stator assembly 300 is fixedly connected to the housing 100 by means of thermoforming or injection molding, ensuring that the stator assembly 300 maintains a stable position. The connector assembly 400 is electrically connected to the circuit board 200 by inserting a second set of pins 420 into the second socket 220 of the circuit board 200 to achieve electrical conduction. The second set of pins 420 can be made of copper alloy to improve conductivity.

[0034] Specifically, the first set of pins 320 is soldered or press-fitted to the circuit board 200, and similarly, the second set of pins 420 is soldered or press-fitted to the circuit board 200.

[0035] The welding connection refers to the formation of a conductive path between the first set of pins 320 or the second set of pins 420 and the circuit board 200 by molten metal material (mainly tin) to ensure the stability and sealing of the electrical connection.

[0036] Press-fit connection refers to using mechanical pressure to form an interference fit between the first set of pins 320 or the second set of pins 420 and the metallized holes of the circuit board 200. Specifically, this can be achieved by setting a barb structure or an elastic snap structure at the end of the first set of pins 320 or the second set of pins 420. This method facilitates rapid assembly and has vibration resistance.

[0037] Both connection methods shorten the outward extension dimension of the connector 400 by reducing the transition structure between the connector 400 and the circuit board 200.

[0038] The housing 100 includes a main body 140 and an injection-molded part 120. The main body 140 is disposed on the outer periphery of the stator assembly 300, and the injection-molded part 120 is disposed on the outer periphery of at least a portion of the first set of pins 320. The connector assembly 400 is connected to the main body 140, and the connector assembly 400 and the injection-molded part 120 are spaced apart along the circumference of the stator assembly 300. That is, the situation where the first set of pins 320 is sandwiched between the second set of pins 420 and the stator housing 310 is eliminated. Specifically, they can be arranged on adjacent sides or diagonally opposite positions of the housing 100 to disperse the pin layout density.

[0039] It should be noted that the connector assembly 400 and the housing 100 are integrally injection molded to enhance the structural strength of the entire electromagnetic coil and reduce the number of processes.

[0040] Alternatively, the connector 400 can be separated from the housing 100 to facilitate the assembly and disassembly of the electromagnetic coil.

[0041] The injection molding part 120 refers to the insulating structure formed by injection molding and covering the first set of pins 320. Specifically, it can be integrally molded from thermoplastic material and is used to fix the position of the pins and enhance the connection strength between the housing 100 and the first set of pins 320.

[0042] Specifically, after the circuit board 200 is installed inside the housing 100, the stator assembly 300 and the connector assembly 400 are connected to the surface of the circuit board 200 from the same side. The first set of pins 320 of the stator assembly 300 is located in the direction of the first side wall of the housing 100, and the second set of pins 420 of the connector assembly 400 is located in the direction of the second side wall of the housing 100, and the two sets of pins (the first set of pins 320 and the second set of pins 420) are spatially misaligned.

[0043] Compared to existing technologies, in traditional horizontal interface solutions, both sets of pins for the connector assembly 400 and the stator assembly 300 are concentrated on the same side of the housing 100, resulting in excessive congestion on that side and forcing the connector assembly 400 to extend excessively outward. This solution, by staggering the two sets of pins, effectively reduces the lateral protrusion of the connector assembly 400 into the housing 100, thereby significantly reducing the horizontal installation space requirements for the electromagnetic coil. Furthermore, the optimized layout of the electromagnetic coil components makes it easier to integrate the electromagnetic coil into compact devices, making it particularly suitable for refrigeration system installation scenarios where lateral space is critical.

[0044] Furthermore, in one embodiment, the first set of pins 320 and the second set of pins 420 are located on the non-opposite side of the stator assembly 300 along its own radial direction, that is, the first set of pins 320 and the second set of pins 420 are not arranged opposite each other along the diametrical direction of the stator housing 310.

[0045] It is important to note that, such as Figure 2 As shown, one end of the injection molding part 120 is connected to the main body part 140, and the other end extends along the first direction toward a direction away from the stator assembly 300. The injection molding part 120 and the housing 100 are integrally molded. As can be seen from the above, the injection molding part 120 and the connector assembly 400 are spaced apart along the outer periphery of the stator assembly 300.

[0046] In one embodiment, one end of the connector 400 is connected to the main body 140, and the other end extends along the second direction toward a direction away from the stator assembly 300. The included angle A between the first direction and the second direction satisfies 30°≤A≤150°. At this time, the connector of the connector 400 is horizontally extended and biased to one side.

[0047] It should be noted that the included angle A between the first direction and the second direction refers to the spatial angle formed by the extension paths of the connector 400 and the injection molding part 120. Specifically, it can be achieved by adjusting the tilt angle of the connection part of the housing 100, which is used to optimize the spatial layout between the connector 400 and the injection molding part 120.

[0048] Specifically, the injection-molded portion 120 is configured to extend from the housing 100 outside the stator assembly 300 and expand outward in a first direction, while the connector assembly 400 extends in a second direction, with the extension paths of the two forming an angle of 30° to 150°. This non-collinear arrangement allows the connector assembly 400 to extend outward without being completely horizontal, instead shortening its straight-line distance extending out of the housing 100 by adjusting the angle, thereby reducing the lateral installation space requirement for the electromagnetic coil. For example, when the angle A is 90°, the connector assembly 400 can extend perpendicular to the direction of the injection-molded portion 120, further compressing the overall structure's volume occupied in a single direction.

[0049] Specifically, A can be 30°, 60°, 120° or 150°, preferably A is 90°, that is, the setting direction of the connector 400 and the setting direction of the injection molding part 120 are set at right angles.

[0050] In one embodiment, such as Figure 5 As shown, the first group of needles 320 includes a plurality of first needle bodies 321, which are arranged at intervals along the second direction.

[0051] However, this is not the only embodiment. In other embodiments, the plurality of first needle bodies 321 may also be arranged in two or three rows.

[0052] Furthermore, in one embodiment, one end of each first needle body 321 is electrically connected to the coil winding 330 of the stator assembly 300, and the other end is electrically connected to the first socket 210 on the circuit board 200.

[0053] Furthermore, in one embodiment, as Figure 4 As shown, the bottom wall of the inner cavity 110 is provided with a first partition strip 610. One end of the first partition strip 610 away from the bottom wall of the inner cavity 110 abuts against the circuit board 200. Of course, in other embodiments, in order to avoid some circuits on the circuit board 200, the first partition strip 610 can also be spaced apart from the circuit board 200. Furthermore, the first partition strip 610 is provided between adjacent first needle bodies 321 respectively.

[0054] The first separator 610 refers to a strip-shaped structure set on the bottom wall of the inner cavity 110 and extending upward to the circuit board 200. Specifically, it can be integrally formed with the shell 100 by injection molding process. It is used to form physical isolation between adjacent first pins 321 to prevent short circuits caused by excessive solder on the back of the circuit board 200 sticking together during soldering.

[0055] Specifically, the first partition strip 610 extends vertically upward along the bottom wall of the inner cavity 110, and its end contacts the circuit board 200 to form a support. The first partition strip 610 plays a limiting role in the pin welding or pressing process, so that the first pin body 321 is restricted to a fixed area between adjacent first partition strips 610.

[0056] In one embodiment, such as Figure 3 As shown, the second group of needles 420 includes a plurality of second needle bodies 421, which are arranged at intervals along a first direction.

[0057] Similarly, in other embodiments, the plurality of second needles 421 may also be arranged in two or three rows.

[0058] Furthermore, in one embodiment, each second pin 421 passes through both ends of the connector housing 410, and one end of the second pin 421 is electrically connected to the second socket 220 on the circuit board 200.

[0059] Furthermore, in one embodiment, as Figure 4 As shown, the bottom wall of the inner cavity 110 is provided with a second partition strip 620. One end of the second partition strip 620 away from the bottom wall of the inner cavity 110 abuts against the circuit board 200. Of course, in other embodiments, in order to avoid some circuits on the circuit board 200, the second partition strip 620 can also be spaced apart from the circuit board 200. Furthermore, the second partition strip 620 is provided between adjacent second needle bodies 421 respectively.

[0060] It should be noted that the second separator 620 refers to an isolation component that is symmetrical or similar in structure to the first separator 610. It can be formed using the same injection molding process. Its function is to separate the second pin body 421 and prevent short circuits caused by excessive solder on the back of the circuit board 200 sticking together during soldering.

[0061] Specifically, the second partition strip 620 extends vertically upward along the bottom wall of the inner cavity 110, and its end contacts the circuit board 200 to form a support. The second partition strip 620 plays a limiting role in the pin welding or pressing process, so that the second pin body 421 is restricted to a fixed area between adjacent second partition strips 620.

[0062] It should be noted that the first partition bar 610 and the second partition bar 620 are integrally injection molded with the housing 100.

[0063] In one embodiment, such as Figure 5As shown, the electromagnetic coil also includes a grounding pin 800. One end of the grounding pin 800 is connected to the stator housing 310 of the stator assembly 300, and the other end is soldered and electrically connected to the circuit board 200. The circuit board 200 is provided with a third socket 230, and the grounding pin 800 is inserted into the third socket 230. An injection-molded part 120 is disposed on at least a portion of the outer periphery of the grounding pin 800.

[0064] The stator housing 310 refers to the metal shell 100 that encloses the coil windings 330 of the stator assembly 300. It can be made of aluminum alloy or copper alloy and formed through stamping or casting processes. When connected to the grounding pin 800, it can shield external interference signals. The grounding pin 800 is a conductive component used to conduct static electricity or interference signals from the stator housing 310 to the circuit board 200. It can be a metal rod or sheet mechanically connected to the stator housing 310 and fixed to the circuit board 200 by welding, thereby forming a stable grounding loop.

[0065] Specifically, in one embodiment, the grounding pin 800 is disposed on one side of the first set of pins 320.

[0066] When the shell 100 is thick in certain areas, in order to reduce the wall thickness and weight, and to reduce the shrinkage deformation of the shell 100, in one embodiment, such as Figure 3 As shown, the housing 100 has multiple hollowed-out adhesive reduction cavities 130 inside, and the adhesive reduction cavities 130 are connected to the inner cavity 110.

[0067] The material-reducing cavity 130 refers to the cavity structure formed inside the shell 100 by removing part of the material. Specifically, it can be achieved by using the core structure design of the mold in the injection molding process, by reserving a cavity area of ​​a specific shape during the molding of the shell 100. This structure reduces the amount of material accumulation in local areas of the shell 100, thereby reducing the risk of deformation caused by uneven material shrinkage during the injection molding process.

[0068] Specifically, multiple shrinkage cavities 130 are provided in the non-load-bearing areas of the housing 100, for example, distributed symmetrically on the sidewalls or bottom of the housing 100. The hollowed-out shape of the shrinkage cavities 130 can be rectangular, circular, or irregular. By connecting the inner cavity 110, the shrinkage stress concentration of the injection molded material during the molding and cooling stage can be reduced.

[0069] Compared with existing technologies, this solution, through the hollow design of the adhesive-reducing cavity 130, eliminates local stress concentration and reduces the probability of deformation of the housing 100 while ensuring the overall strength of the housing 100, and also reduces material consumption. Furthermore, the interconnected design of the adhesive-reducing cavity 130 promotes heat exchange between the inner cavity 110 of the housing 100 and the external environment, which helps dissipate heat from the circuit board 200 and extends the service life of the electromagnetic coil.

[0070] Furthermore, in one embodiment, the bottom wall of the inner cavity 110 is recessed to form a de-adhesion cavity 130; a portion of the de-adhesion cavity 130 is disposed in the injection molding section 120, and this portion of the de-adhesion cavity 130 is located between the stator assembly 300 and the second set of pins 420; another portion of the de-adhesion cavity 130 is disposed in the connector assembly 400, and this portion of the de-adhesion cavity 130 is located between the second set of pins 420 and the circuit board 200.

[0071] This design significantly reduces the wall thickness of the housing 100 and the connector assembly 400, thereby greatly reducing the weight of the entire electromagnetic coil.

[0072] In one embodiment, such as Figure 3 and Figure 4 As shown, the bottom wall of the inner cavity 110 is provided with support columns 700. Multiple support columns 700 are distributed along the periphery of the circuit board 200 and are supported at the lower end of the circuit board 200 so that the circuit board 200 and the bottom wall of the inner cavity 110 are spaced apart.

[0073] Among them, the support column 700 refers to the columnar structure extending upward from the bottom wall of the inner cavity 110. Specifically, it can be implemented in the form of a cylindrical or prismatic structure, and is used to form local support for the lower surface of the circuit board 200.

[0074] The peripheral distribution refers to the arrangement of multiple support columns 700 along a ring or rectangular path along the edge area of ​​the circuit board 200. Specifically, it can be achieved by using a layout with uniform or non-uniform intervals to ensure that the circuit board 200 is subjected to uniform force as a whole.

[0075] Specifically, the support pillar 700 is integrally formed with the housing 100 through injection molding, or it is detachably connected to the housing 100 via fasteners. During assembly, the circuit board 200 is placed on the upper surface of the support pillar 700. The support pillar 700 contacts the lower surface of the circuit board 200 and provides vertical support, preventing the circuit board 200 from bending, deforming, or shifting due to gravity or external vibration. The distribution range of the support pillars 700 covers the edge area of ​​the circuit board 200, reducing the unsupported area in the center of the circuit board 200, while avoiding interference with the layout of electronic components on the circuit board 200.

[0076] Compared with the prior art, the support column 700 of this application disperses the stress area of ​​the circuit board 200 through a multi-point contact support method, thereby enhancing the structural stability.

[0077] In one embodiment, such as Figure 3 , Figure 4 and Figure 6As shown, the sidewall of the inner cavity 110 is provided with reinforcing ribs 900. Each reinforcing rib 900 extends along a direction perpendicular to the surface of the circuit board 200. Multiple reinforcing ribs 900 are distributed along the periphery of the inner cavity 110. Furthermore, the circuit board 200 is provided with clearance openings 240 corresponding to the reinforcing ribs 900. When the circuit board 200 is installed in the inner cavity 110, the reinforcing ribs 900 are engaged in the corresponding clearance openings 240.

[0078] The reinforcing rib 900 refers to a protruding structure provided on the side wall of the inner cavity 110. It can be integrally injection molded with the housing 100. By extending in a direction perpendicular to the surface of the circuit board 200, it can improve the deformation resistance of the side wall of the housing 100. The clearance opening 240 refers to a notch opened on the edge of the circuit board 200. It can be formed by stamping or cutting processes and is used to accommodate the embedding of the reinforcing rib 900, thereby limiting the displacement of the circuit board 200 in the inner cavity 110.

[0079] Specifically, during the injection molding process of the housing 100, multiple reinforcing ribs 900 formed on the sidewall of the inner cavity 110 are evenly distributed circumferentially and remain perpendicular to the surface of the circuit board 200. When the circuit board 200 is installed into the inner cavity 110, the clearance openings 240 on its edge correspond one-to-one with the positions of the reinforcing ribs 900, so that the top of the reinforcing rib 900 is embedded inside the clearance opening 240. This fitting structure can both improve the overall rigidity of the housing 100 through the reinforcing ribs 900 and radially limit the circuit board 200 by utilizing the cooperation between the clearance opening 240 and the reinforcing ribs 900.

[0080] In some specific embodiments, the cross-sectional shape of the reinforcing rib 900 can be set as trapezoidal or rectangular, and the opening size of the clearance opening 240 is slightly larger than the top size of the reinforcing rib 900 to facilitate positioning during assembly. In addition, the distribution density of the reinforcing rib 900 can be adjusted according to the size of the housing 100, for example, a denser array of reinforcing ribs 900 can be set at the corner positions of the housing 100.

[0081] Compared with the prior art, this solution not only enhances the torsional deformation resistance of the housing 100 by setting vertically extending reinforcing ribs 900 on the side wall of the inner cavity 110, but also achieves multi-directional fixation of the circuit board 200 in conjunction with the clearance opening 240 structure of the circuit board 200.

[0082] Specifically, in one embodiment, two support columns 700 are distributed on both sides of each reinforcing rib 900.

[0083] The assembly steps for this electromagnetic coil are as follows:

[0084] The coil winding 330 and the first set of pins 320 are assembled to form the stator assembly 300, and the grounding pin 800 is assembled with the nail housing;

[0085] The stator assembly 300 is injection molded to form a housing 100 on the outside. The connector assembly 400 is inserted into the corresponding position of the housing 100. It is important to note that the solder joints of the first set of pins 320, the solder joints of the second set of pins 420, and the solder joints of the grounding pin 800 are exposed.

[0086] Install the circuit board 200 in the inner cavity 110 and complete the soldering of the circuit board 200 and the two sets of pins (the first set of pins 320 and the second set of pins 420);

[0087] The cover plate 500 is sealed and welded (laser welded) at the opening of the inner cavity 110.

[0088] This application also provides an electronic expansion valve, which includes the electromagnetic coil described in any of the above embodiments.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

[0091] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0093] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0094] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0095] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0096] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. An electromagnetic coil, characterized by, The device includes a housing (100), a circuit board (200), a stator assembly (300), and a connector assembly (400). The housing (100) has an inner cavity (110), and the circuit board (200) is disposed in the inner cavity (110). The stator assembly (300) and the connector assembly (400) are disposed on the same side of the circuit board (200). The stator assembly (300) has a first set of pins (320), and the stator assembly (300) is electrically connected to the circuit board (200) through the first set of pins (320). The housing (100) includes a main body (140) and an injection-molded part (120). The main body (140) is disposed on the outer periphery of the stator assembly (300), and the injection-molded part (120) is disposed on at least a portion of the outer periphery of the first set of pins (320). The connector assembly (400) is connected to the main body (140), and the connector assembly (400) and the injection-molded part (120) are spaced apart along the circumferential direction of the stator assembly (300).

2. The electromagnetic coil of claim 1, wherein, The connector assembly (400) has a second set of pins (420), and the connector assembly (400) is electrically connected to the circuit board (200) through the second set of pins (420). The first set of pins (320) is soldered or press-fitted to the circuit board (200); And / or, the second set of pins (420) is soldered or press-fitted to the circuit board (200).

3. The electromagnetic coil of claim 2, wherein, The first set of pins (320) includes a plurality of first pin bodies (321). The bottom wall of the inner cavity (110) is provided with a first partition strip (610). The end of the first partition strip (610) away from the bottom wall of the inner cavity (110) extends toward the circuit board (200). The first partition strip (610) is provided between adjacent first pin bodies (321). And / or, the second set of pins (420) includes a plurality of second pin bodies (421), the bottom wall of the inner cavity (110) is provided with a second partition strip (620), the end of the second partition strip (620) away from the bottom wall of the inner cavity (110) extends toward the circuit board (200), and the second partition strip (620) is provided between adjacent second pin bodies (421).

4. The electromagnetic coil of claim 1, wherein, One end of the injection molding part (120) is connected to the main body part (140), and the other end extends along a first direction toward a direction away from the stator assembly (300); One end of the connector assembly (400) is connected to the main body (140), and the other end extends along the second direction toward a direction away from the stator assembly (300). The included angle A between the first direction and the second direction satisfies 30°≤A≤150°.

5. The electromagnetic coil of claim 4, wherein, A is 90°.

6. The electromagnetic coil of claim 1, wherein, It also includes a grounding pin (800), one end of which is connected to the stator housing (310) of the stator assembly (300), and the other end is soldered and electrically connected to the circuit board (200). The injection molding part (120) is disposed on at least part of the outer periphery of the grounding pin (800).

7. The electromagnetic coil of claim 1, wherein, The housing (100) has a plurality of hollowed-out adhesive-reducing cavities (130) inside, and the adhesive-reducing cavities (130) are connected to the inner cavity (110).

8. The electromagnetic coil of claim 7, wherein, The bottom wall of the inner cavity (110) is recessed to form the rubber reduction cavity (130). A portion of the rubber reduction cavity (130) is disposed in the injection molding part (120), and another portion of the rubber reduction cavity (130) is disposed in the connector assembly (400).

9. The electromagnetic coil of claim 1, wherein, The bottom wall of the inner cavity (110) is provided with support columns (700), and a plurality of support columns (700) are distributed along the periphery of the circuit board (200) and supported at the lower end of the circuit board (200).

10. The electromagnetic coil of claim 1, wherein, The inner cavity (110) has a reinforcing rib (900) on its side wall. Each reinforcing rib (900) extends along a direction perpendicular to the surface of the circuit board (200). Multiple reinforcing ribs (900) are distributed along the periphery of the inner cavity (110). The circuit board (200) has a clearance opening (240) corresponding to the reinforcing rib (900). The reinforcing rib (900) is engaged in the corresponding clearance opening (240).

11. The electromagnetic coil of claim 1, wherein, The connector assembly (400) and the housing (100) are integrally injection molded, or the connector assembly (400) and the housing (100) are separate components.

12. An electronic expansion valve characterized by Includes the electromagnetic coil as described in any one of claims 1-11.

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