Electromagnetic coil and assembling method of electromagnetic coil

Abstract

The invention relates to an electromagnetic coil and an assembling method of the electromagnetic coil, the electromagnetic coil comprises a shell, a circuit board, a stator assembly, a plugging assembly and a cover plate, and the circuit board is provided with a plane A facing the cover plate and a plane B deviating from the cover plate. A first group of pins of the stator assembly are inserted into the circuit board along the direction from the plane B to the plane A and are welded on the circuit board, the circuit board is arranged in an inner cavity of the shell, and the cover plate covers an opening of the inner cavity; the plug-in assembly is fixed on the cover plate and is separated from the cover plate; a second group of pins of the plug-in assembly are inserted into the circuit board along the direction from the plane A to the plane B and are electrically connected to the circuit board; the position of the first group of pins on the plane A of the circuit board does not coincide with the orthographic projection of the plugging assembly on the plane A. According to the electromagnetic coil and the assembling method of the electromagnetic coil provided by the invention, the problem that the contact pin and the circuit board of the existing stator assembly are prone to poor contact due to the fact that tin soldering cannot be carried out is solved.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to an electromagnetic coil and an assembly method of the electromagnetic coil. Background Art

[0002] At present, electric valves are often installed in refrigeration systems. The electric valves mainly include a valve body and an electromagnetic coil. A stator is provided in the electromagnetic coil, and a rotor is provided in the valve body. When the electromagnetic coil is energized to generate a magnetic field, the stator in the electromagnetic coil can drive the rotor in the valve body to rotate, thereby driving the valve core to move, thereby adjusting the refrigerant flow at the valve port, thereby achieving higher control accuracy.

[0003] The electromagnetic coil includes a circuit board, a stator assembly and a connector assembly. The stator assembly and the connector assembly are electrically connected to two opposite sides of the circuit board. However, the connector assembly is large in size and often covers the welding parts between the pins of the stator assembly and the circuit board, making it difficult to weld the pins of the stator assembly and the circuit board. Summary of the Invention

[0004] Based on this, it is necessary to provide an electromagnetic coil and an assembly method of the electromagnetic coil to solve the problem that the pins and circuit boards of the existing stator assembly are prone to poor contact due to the inability to solder.

[0005] The electromagnetic coil provided in the present application includes a shell, a circuit board, a stator assembly, a connector assembly and a cover plate. The stator assembly has a first group of pins. The circuit board has an A plane set toward the cover plate, and a B plane set away from the cover plate. The first group of pins is inserted into the circuit board along the direction from the B plane to the A plane and is welded to the circuit board. The shell is provided with an inner cavity, the circuit board is arranged in the inner cavity, and the cover plate is covered at the opening of the inner cavity; the connector assembly has a second group of pins, the connector assembly is fixed to the cover plate and is separated from the cover plate, the second group of pins is inserted into the circuit board along the direction from the A plane to the B plane and is electrically connected to the circuit board; the position of the first group of pins on the A plane of the circuit board and the orthographic projection of the connector assembly on the A plane do not coincide.

[0006] In one embodiment, the second group of pins is soldered to the circuit board; or, the second group of pins is press-fitted to the circuit board.

[0007] In one embodiment, the electromagnetic coil also includes a grounding pin, one end of which is connected to the stator housing of the stator assembly, and the other end is welded and electrically connected to the circuit board. The position of the grounding pin on the circuit board in plane A does not coincide with the orthographic projection of the connector assembly on plane A.

[0008] In one embodiment, the electromagnetic coil further includes a plurality of positioning portions, one end of the positioning portion is connected to the outer peripheral side of the connector assembly, and the other end abuts against the inner wall of the inner cavity, so that the connector assembly can be limited and engaged with the shell through the positioning portion.

[0009] In one embodiment, the positioning portion includes a plurality of positioning pieces provided on the outer periphery of the connector assembly, a portion of the positioning pieces abuts against the inner wall of the housing, and another portion of the positioning pieces abuts against the outer wall of the stator assembly extending into the inner cavity.

[0010] In one embodiment, the electromagnetic coil further includes a plurality of positioning posts, one end of the positioning posts is fixedly connected to the connector assembly, and the other end thereof is passed through the circuit board.

[0011] In one embodiment, a step structure is provided on the peripheral side of the positioning post. When the positioning post is passed through the circuit board, the positioning post can be stopped on the A plane of the circuit board by the step structure.

[0012] In one embodiment, the first group of pins includes a plurality of first needle bodies, the bottom wall of the inner cavity is provided with a first dividing strip, one end of the first dividing strip away from the bottom wall of the inner cavity protrudes toward the circuit board and is stopped between adjacent first needle bodies.

[0013] In one embodiment, the second group of pins includes a plurality of second pin bodies, the connector assembly also includes a connector shell, the second group of pins is fixed to the connector shell, the connector shell is provided with a second dividing strip, the second dividing strip is protruded toward the circuit board at one end away from the connector shell, and is stopped between adjacent second pin bodies.

[0014] In one embodiment, the first group of pins includes a plurality of first pins, the second group of pins includes a plurality of second pins, and the angle A between the arrangement direction of the plurality of first pins of the first group of pins and the arrangement direction of the plurality of second pins of the second group of pins satisfies 30°≤A≤150°.

[0015] The present application also provides an assembly method for an electromagnetic coil, which is used to assemble the electromagnetic coil described in any one of the above embodiments, and the assembly method comprises the following steps:

[0016] The connector assembly is fixedly electrically connected to the circuit board via a second set of pins;

[0017] Place the circuit board in the inner cavity and fix the connector assembly to the housing;

[0018] The stator assembly is welded to the circuit board through the first set of pins, and the position of the first set of pins on plane A of the circuit board does not coincide with the orthographic projection of the connector assembly on plane A; the cover is fixedly sleeved on the outer peripheral side of the second set of pins and fixedly covered at the opening of the inner cavity.

[0019] In one embodiment, the circuit board is first welded and fixed to the second set of pins outside the shell, and the welding position is the B plane of the circuit board; then, the circuit board is welded and fixed to the first set of pins in the inner cavity, and the welding position is the A plane of the circuit board.

[0020] In one embodiment, the circuit board is first plugged and fixed to the second set of pins outside the housing, and then the circuit board is welded and fixed to the first set of pins in the inner cavity, and the welding position is plane A of the circuit board.

[0021] In one embodiment, the circuit board is plugged and fixed to the second set of pins in the inner cavity of the shell, and the circuit board is welded and fixed to the first set of pins in the shell, and the welding position is the A plane of the circuit board.

[0022] Compared with the prior art, the electromagnetic coil and the assembly method of the electromagnetic coil provided by the present application, specifically, after the circuit board is installed in the inner cavity of the shell, the first group of pins of the stator assembly are inserted upward into the circuit board and welded, and the welding area is located on the upper surface of the circuit board. The connector assembly is inserted from above the cover plate, and its second group of pins is inserted downward into the circuit board and fixed by welding or crimping. Since the insertion directions of the two groups of pins are opposite and the projection areas do not overlap with each other, the connector assembly will not block the welding area of the first group of pins of the stator assembly during assembly, and the operator can clearly observe the welding position to ensure the welding quality. For example, the projection of the first group of pins is located on the left side of the circuit board, and the projection of the second group of pins is located on the right side of the circuit board. The distance between the two is greater than the diameter of the pins to avoid spatial interference.

[0023] Compared with the existing technology, the existing solution blocks the welding area of the first group of pins due to the connector component. However, after the connector component is installed, the projection position of the connector component on the circuit board is separated from the welding area of the first group of pins of the stator component on the circuit board, so that the first group of pins of the stator component can be soldered.

[0024] Furthermore, through the above-mentioned technical solution, the present application enables the first set of pins of the stator assembly to be reliably soldered to the circuit board, avoiding the risk of contact failure caused by relying solely on mechanical connection. The spatial separation of the connector assembly and the stator assembly makes the soldering operation visual and easy to perform, reducing production costs and improving assembly efficiency.

[0025] Furthermore, since the connector assembly and the cover are arranged separately, the second set of pins and the circuit board can be welded first, and then the first set of pins and the circuit board can be welded, and finally the cover is covered. In this way, during the welding process of the first set of pins and the circuit board, the cover will not block the welding process, thereby greatly improving the reliability and success rate of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of an electromagnetic coil according to an embodiment of the present application;

[0028] Figure 2 A cross-sectional view of an electromagnetic coil according to an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the partial structure of an electromagnetic coil according to an embodiment of the present application Figure 1 ;

[0030] Figure 4 A schematic diagram of the assembly structure of a connector assembly and a circuit board according to an embodiment of the present application;

[0031] Figure 5 A schematic diagram of a partial structure of a stator assembly according to an embodiment of the present application;

[0032] Figure 6 A schematic structural diagram of a circuit board according to an embodiment of the present application;

[0033] Figure 7 A schematic diagram of the partial structure of an electromagnetic coil according to an embodiment of the present application Figure 2 ;

[0034] Figure 8 A schematic diagram of the partial structure of an electromagnetic coil according to an embodiment of the present application Figure 3 .

[0035] Figure markings: 100, shell; 110, inner cavity; 111, first dividing strip; 200, circuit board; 210, first jack; 220, second jack; 230, third jack; 240, fourth jack; 300, stator assembly; 310, stator housing; 320, first group of pins; 321, first needle body; 330, coil winding; 400, connector assembly; 410, connector housing; 411, second dividing strip; 420, second group of pins; 421, second needle body; 500, cover; 510, connector; 600, positioning column; 700, positioning portion; 710, positioning piece; 800, grounding pin. DETAILED DESCRIPTION

[0036] See also Figures 1-8In one embodiment, the electromagnetic coil includes a housing 100, a circuit board 200, a stator assembly 300, a connector assembly 400 and a cover 500. The circuit board 200 has an A plane arranged toward the cover 500, and a B plane arranged away from the cover 500. The stator assembly 300 is fixedly connected to the housing 100. The stator assembly 300 has a stator housing 310 and a first group of pins 320 electrically connected to the stator housing 310. The first group of pins 320 are inserted and soldered to the circuit board 200 along a direction from the B plane to the A plane (defined as a first direction). Specifically, the circuit board 200 is provided with a plurality of first jacks 210 arranged in parallel, and the first group of pins 320 are inserted into the circuit board 200 through the first jacks 210.

[0037] Among them, the shell 100 refers to the supporting structure surrounding the circuit board 200 and internal components, and can be specifically injection molded by insulating materials. The stator assembly 300 refers to the electromagnetic component that drives the rotor. The connector assembly 400 refers to the interface component connected to the external device, such as the connector shell 100 that is injection molded.

[0038] It should be noted that, in one embodiment, Figure 5 and Figure 6 As shown, the first set of pins 320 includes at least four first pins 321 electrically connected to the coil windings 330 of the stator assembly 300. In other words, the number of first pins 321 is greater than or equal to four. Accordingly, the number of first jacks 210 is also at least four, with each first jack 210 and first pin 321 corresponding to each other. Specifically, the first set of pins 320 can be designed as direct-insert pins, such as copper first pins 321, which are soldered to the circuit board 200 through the first jacks 210.

[0039] The first needle 321 is a metal conductor used to connect the coil winding 330 between the designated subassembly 300 and the circuit board 200 .

[0040] Specifically, the second needle body 421 is inserted into the via hole on the other side of the circuit board 200 in a single row and straight line arrangement, and its end forms a detachable contact with the female end of the external connector through an elastic snap, thereby realizing modular docking between the external control signal and the circuit board 200.

[0041] However, the present invention is not limited thereto. In other embodiments, the number of the first needle bodies 321 may be two or three.

[0042] like Figure 2-Figure 4As shown, the housing 100 has an inner cavity 110, the circuit board 200 is disposed in the inner cavity 110, and the cover plate 500 is disposed over the opening of the inner cavity 110. The connector assembly 400 includes a connector housing 410 and a second set of pins 420 fixed to the connector housing 410. The connector housing 410 is primarily an injection molded part, and the second set of pins 420 are embedded within the connector housing 410 through injection molding. The stator assembly 300 and the connector assembly 400 are respectively disposed on the upper and lower sides of the circuit board 200. Of course, as the installation direction of the electromagnetic coil changes, the stator assembly 300 and the connector assembly 400 can also be installed in other relative installation positions, such as on the left and right sides, or the front and back sides of the circuit board 200. One end of the connector assembly 400 is fixedly inserted into the cover plate 500 through the connector housing 410 and is separated from the cover plate 500, and the other end is inserted into and electrically connected to the circuit board 200 along the direction from plane A to plane B (defined as the second direction) through the second group of pins 420. Obviously, the first direction and the second direction are opposite. Specifically, the circuit board 200 is provided with a plurality of second jacks 220 arranged in parallel, and the second group of pins 420 are inserted into the circuit board 200 through the second jacks 220.

[0043] Specifically, the second group of pins 420 is connected to the circuit board 200 by welding or press-fitting.

[0044] Soldering refers to the process of melting solder at high temperatures to form a fixed electrical connection between the second set of pins 420 and the circuit board 200, ensuring a secure connection between the second set of pins 420 and the circuit board 200. When soldering is used on the second set of pins 420, solder pads or tinned areas may be pre-placed at the ends of the second set of pins 420. The solder is heated to melt and cover the contact areas between the second set of pins 420 and the circuit board 200, forming a permanent electrical connection upon cooling.

[0045] A press-fit connection uses mechanical pressure to create an interference fit or elastic contact between the second set of pins 420 and the circuit board 200. This can be achieved using a snap-fit structure or elastic clamping elements, enabling electrical connection without the use of solder. When using a press-fit connection, the ends of the second set of pins 420 can be designed as elastic contact pieces or a plug-in structure with barbs. External force is used to press the second set of pins 420 into the through-holes or slots of the circuit board 200, achieving reliable contact through elastic deformation or mechanical engagement. Both methods avoid the poor contact problems associated with relying solely on interference fit.

[0046] This solution allows for either soldering or press-fit connections to the second set of pins 420. Soldering eliminates the risk of unstable contact resistance, while press-fit connections retain the flexibility of non-soldered assembly. While existing technologies offer only a single connection method between the second set of pins 420 and the circuit board 200, this solution combines or selects both connection methods, adapting to the reliability requirements of various application scenarios.

[0047] It should be noted that, in one embodiment, Figure 4 and Figure 6 As shown, the second group of pins 420 includes at least four second pins 421, each of which is capable of electrically connecting the circuit board 200 to an external device. In other words, the number of second pins 421 is greater than or equal to four. Accordingly, the number of second jacks 220 is also at least four, with each second jack 220 and second pin 421 corresponding to each other. Specifically, the second pins 421 of the second group of pins 420 can be designed as bent pins, such as an L-shaped structure, that are inserted into the circuit board 200 in the reverse direction.

[0048] However, the present invention is not limited thereto. In other embodiments, the number of the second needle bodies 421 may be two or three.

[0049] like Figure 3 As shown, the position of the first group of pins 320 on the A plane of the circuit board 200 does not coincide with the orthographic projection of the connector assembly 400 on the A plane.

[0050] It should be noted that non-overlapping can be achieved through staggered arrangement or angle offset.

[0051] Specifically, after the circuit board 200 is installed in the inner cavity 110 of the housing 100, the first set of pins 320 of the stator assembly 300 are vertically inserted upward into the circuit board 200 and soldered, with the soldering area located on the upper surface of the circuit board 200. The connector assembly 400 is inserted from above the cover 500, and its second set of pins 420 are vertically inserted downward into the circuit board 200 and secured by soldering or crimping. Because the two sets of pins are inserted in opposite directions, and the position of the first set of pins 320 on plane A of the circuit board 200 and the orthographic projection of the connector assembly 400 on plane A do not overlap, the connector assembly 400 does not obstruct the soldering area of the first set of pins 320 of the stator assembly 300 during assembly. The operator can clearly observe the soldering position, ensuring soldering quality. For example, the projection of the first set of pins 320 is located on the left side of the circuit board 200, while the projection of the second set of pins 420 is located on the right side of the circuit board 200. The distance between the two is greater than the pin diameter to avoid spatial interference.

[0052] Compared to existing solutions, which rely on mechanical interference fit due to the connector assembly 400 obstructing the soldering area, this solution utilizes a pin layout with opposite orientations and projected offsets, separating the soldering area between the connector assembly 400 and the stator assembly 300, thus facilitating the use of soldering. For example, while traditional fisheye pins require precision stamping and extrusion into the circuit board 200, this solution allows the use of standard in-line pins, enabling connections to be made using conventional soldering equipment, reducing process complexity.

[0053] Furthermore, through the above-described technical solution, the present application enables the first set of pins 320 of the stator assembly 300 to be reliably soldered to the circuit board 200, avoiding the risk of contact failure caused by relying solely on mechanical connections. The spatial separation of the connector assembly 400 and the stator assembly 300 makes the soldering operation visual and easy to perform, while also eliminating the need for a specialized pin structure, reducing production costs and improving assembly efficiency. For example, in temperature cycling tests, the contact resistance stability of the first set of pins 320 connected by soldering was superior to that of traditional extrusion connections, thereby improving the reliability of the electromagnetic coil under complex operating conditions.

[0054] Furthermore, since the connector assembly 400 and the cover body are arranged separately, the second group of pins 420 and the circuit board 200 can be welded first, and then the first group of pins 320 and the circuit board 200 can be welded, and finally the cover body can be covered. In this way, during the welding process of the first group of pins 320 and the circuit board 200, the cover body will not block the welding process, thereby greatly improving the reliability and success rate of welding.

[0055] In one embodiment, the angle A between the arrangement direction of the first pins 321 of the first group of pins 320 and the arrangement direction of the second pins 421 of the second group of pins 420 satisfies 30°≤A≤150°.

[0056] The arrangement direction refers to the linear trajectory formed by connecting the axes of multiple pins (including the first pin 321 and the second pin 421) on the plane of the circuit board 200. This can be achieved using either a linear or curved arrangement. Different arrangement directions create spatial distribution differences, addressing soldering area obstruction. Angle A refers to the angle between the arrangement directions of the first and second groups of pins 320 and 420 within the plane of the circuit board 200. This can be achieved using either an orthogonal or oblique arrangement. This angle control allows for a non-overlapping distribution of the pin soldering areas.

[0057] Specifically, while the first pins 321 are arranged horizontally along the left edge of the circuit board 200, the second pins 421 can be designed to be arranged vertically or diagonally. For example, a second set of pins 420 arranged vertically on the right side of the circuit board 200 allows the soldering areas of the first and second sets of pins 320, 420 to be completely separated from each other when viewed from above. When the first and second sets of pins 320, 420 are arranged at a 45-degree or 90-degree angle, their projected areas are staggered along the edge of the circuit board 200, providing ample space for soldering operations.

[0058] Furthermore, the standardized arrangement angle range improves the process compatibility of electromagnetic coil assembly, and efficient welding operations can be achieved without relying on special pin structures.

[0059] In one embodiment, if Figure 1and Figure 2 As shown, the cover plate 500 is provided with a socket 510, and the connector assembly 400 is passed through the cover plate 500 through the socket 510 and is fixedly connected to the cover plate 500. Specifically, the cover plate 500 and the connector assembly 400 can be fixedly connected by interference fit or by colloid bonding.

[0060] The connector port 510 is an opening in the cover 500 through which the connector assembly 400 passes. Specifically, it can be implemented as a rectangular or circular hole, with its dimensions adapted to the shape of the connector assembly 400. The provision of the connector port 510 allows the connector assembly 400 to be installed and positioned independently of the cover 500, avoiding spatial interference with the pins of the stator assembly 300.

[0061] Specifically, the cover plate 500 and connector assembly 400 utilize a separate structural design. The connector assembly 400 passes through the cover plate 500 through the connector opening 510 and is then securely connected. During assembly, the connector assembly 400 can be pre-installed separately on the circuit board 200 and then assembled with the cover plate 500, thereby reducing obstruction of the soldering process by other components. The edges of the connector opening 510 can be provided with guide grooves or positioning bosses to automatically align the connector assembly 400 during insertion, ensuring that the second set of pins 420 precisely mate with the circuit board 200 along the predetermined orientation.

[0062] In one embodiment, if Figure 7 As shown, the first group of pins 320 includes multiple first needle bodies 321, and the bottom wall of the inner cavity 110 is provided with a first dividing strip 111. The first dividing strip 111 protrudes toward the circuit board 200 at one end away from the bottom wall of the inner cavity 110 and is stopped between adjacent first needle bodies 321.

[0063] Among them, the first dividing strip 111 refers to a strip structure arranged 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 using an injection molding process, and is used to form a physical isolation between adjacent first needle bodies 321 to prevent the back of the circuit board 200 from sticking together due to excessive solder during soldering and causing a short circuit.

[0064] In one embodiment, if Figure 8 As shown, the second group of pins 420 includes a plurality of second pin bodies 421, and the connector assembly 400 also includes a connector shell 410. The second group of pins 420 is fixed to the connector shell 410, and the connector shell 410 is provided with a second dividing strip 411. The second dividing strip 411 protrudes toward the circuit board 200 at one end away from the connector shell 410 and is stopped between adjacent second pin bodies 421.

[0065] It should be noted that the second separator 411 refers to an isolation component that is symmetrical or similar in structure to the first separator 111 and can be formed using the same injection molding process. Its function is to separate the second needle body 421 to prevent the back of the circuit board 200 from sticking together and causing a short circuit due to excessive solder during soldering.

[0066] In one embodiment, if Figure 2 and Figure 3 As shown, the electromagnetic coil also includes a plurality of positioning posts 600, and the plurality of positioning posts 600 are arranged along the peripheral direction of the second group of pins 420. Specifically, two or more positioning posts 600 are arranged on both sides of the second group of pins 420, and one end of the positioning post 600 is fixedly connected to the connector housing 410 of the connector assembly 400, and the other end passes through the fourth jack 240 of the circuit board 200.

[0067] Specifically, the positioning post 600 can be made by injection molding or metal processing, and fixes the relative positions of the connector assembly 400 and the stator assembly 300 by passing through the circuit board 200 .

[0068] Specifically, one end of the positioning column 600 is fixed to the outer peripheral side of the connector assembly 400 by hot melt or threaded connection, and the other end extends in a direction perpendicular to the circuit board 200 and passes through the preset fourth socket 240, and finally embedded in the groove or slot of the stator assembly 300.

[0069] Compared to existing technologies, this solution automatically aligns the connector assembly 400 and stator assembly 300 relative to each other through the mechanical connection of the positioning posts 600, eliminating the need for additional adjustment steps. Furthermore, the guiding and limiting effects of the positioning posts 600 ensure consistent positioning of the pins (including the first set of pins 320 and the second set of pins 420) during soldering or press-fitting onto the circuit board 200, thereby reducing the risk of poor contact and improving assembly efficiency.

[0070] Furthermore, in one embodiment, a step structure is provided on the circumference of the positioning post 600 . When the positioning post 600 passes through the circuit board 200 , the positioning post 600 can be stopped at the A plane of the circuit board 200 by the step structure.

[0071] With such a configuration, the step structure can limit the depth of the positioning post 600 penetrating the circuit board 200 and improve the matching accuracy between the two.

[0072] In one embodiment, if Figure 3 As shown, the electromagnetic coil also includes a plurality of positioning portions 700, one end of the positioning portion 700 is connected to the outer peripheral side of the connector housing 410 of the connector assembly 400, and the other end is abutted against the inner wall of the inner cavity 110, so that the connector assembly 400 is limited and matched with the housing 100 through the positioning portion 700.

[0073] Obviously, the positioning portion 700 is a physical structure used to limit the relative position of the connector assembly 400 and the housing 100. Specifically, it can be implemented as a protrusion, a snap, or an elastic arm structure. During the installation process of the connector assembly 400, the positioning portion 700 contacts the inner wall of the housing 100 to generate mechanical interference, thereby limiting the displacement of the connector assembly 400. During this process, the positioning portion 700 and the wall of the inner cavity 110 do not require additional fasteners; the connector assembly 400 is secured solely by the mechanical interference of the structure itself.

[0074] It should be noted that the portion of the outer wall of the stator assembly 300 that extends into the inner cavity 110 can also be considered the inner wall of the inner cavity 110. Therefore, in one embodiment, the positioning portion 700 includes a plurality of positioning pieces 710 disposed on the outer periphery of the connector assembly 400. Some positioning pieces 710 abut against the inner wall of the housing 100 in the inner cavity 110, while other positioning pieces 710 abut against the outer wall of the stator assembly 300 in the inner cavity 110. Furthermore, to adapt to the shape of the stator assembly 300, the circuit board 200 is wound around the outer periphery of the stator assembly 300 to avoid the stator assembly 300.

[0075] The positioning piece 710 and the connector housing 410 are integrally injection-molded. Of course, the two can also be bonded or snap-fitted.

[0076] Through the above technical solution, the present application effectively avoids the problem of failure of the connection between the pin and the circuit board 200 due to force offset during installation or use of the connector component 400, and at the same time simplifies the assembly process, so that the connector component 400 can automatically complete positioning when inserted into the inner cavity 110 of the shell 100, and the alignment accuracy of the pin and the circuit board 200 can be ensured without manual position adjustment.

[0077] In one embodiment, if Figure 3 and Figure 5 As shown, the electromagnetic coil 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 welded and electrically connected to the circuit board 200. In addition, the circuit board 200 is provided with a third jack 230, and the grounding pin 800 is inserted into the third jack 230. The position of the grounding pin 800 on the A plane of the circuit board 200 does not overlap with the orthographic projection of the connector assembly 400 on the A plane.

[0078] The stator housing 310 refers to the metal shell 100 that encloses the coil windings 330 of the stator assembly 300. Specifically, it can be formed from aluminum alloy or copper alloy through a stamping or casting process. When connected to the ground pin 800, it can shield external interference signals. The ground pin 800 is a conductive component used to conduct static electricity or interference signals from the stator housing 310 to the circuit board 200. Specifically, it can be achieved by mechanically connecting the stator housing 310 with a metal rod or metal sheet and securing it to the circuit board 200 by welding, thereby forming a stable ground loop.

[0079] The non-overlapping can be achieved by adjusting the installation position of the ground pin 800 on the circuit board 200 or changing the arrangement direction of the connector assembly 400 to avoid spatial interference between the two.

[0080] During soldering, the projection of ground pin 800 remains separate from the projection of the connector pin 400, allowing the soldering tool to avoid the connector 400 for precise soldering. During assembly, ground pin 800 can be bent along the side of the circuit board 200 or inserted vertically to ensure that its projection remains outside the projection of the connector 400.

[0081] Specifically, in one embodiment, the ground pin 800 is disposed on one side of the first group of pins 320 .

[0082] The present application also provides an assembly method for an electromagnetic coil, which is used to assemble the electromagnetic coil described in any one of the above embodiments, and the assembly method includes the following steps:

[0083] The connector assembly 400 is fixed and electrically connected to the circuit board 200 via the second set of pins 420;

[0084] Place the circuit board 200 in the inner cavity 110 and fix the connector assembly 400 to the housing 100;

[0085] The stator assembly 300 is soldered to the circuit board 200 via the first set of pins 320 , and the orthographic projection of the first set of pins 320 on the plane A of the circuit board 200 and the orthographic projection of the connector assembly 400 on the plane A do not overlap;

[0086] The cover plate 500 is fixedly sleeved on the outer periphery of the second group of pins 420 and fixedly covers the opening of the inner cavity 110 of the housing 100 .

[0087] Through the above technical solution, the present application realizes a reliable welding connection between the first group of pins 320 of the stator assembly 300 and the circuit board 200, avoiding the poor contact problem caused by relying solely on mechanical crimping. At the same time, the electromagnetic coil can still maintain stable electrical connection performance under temperature changing conditions.

[0088] In one embodiment, the circuit board 200 is first soldered and fixed to the second group of pins 420 outside the shell 100, and the soldering position of the circuit board 200 and the second group of pins 420 is the B plane of the circuit board 200 (that is, the side facing away from the connector 400); thereafter, the circuit board 200 is placed in the inner cavity 110 of the shell 100, and the circuit board 200 is soldered and fixed to the first group of pins 320 in the inner cavity 110, and the soldering position of the circuit board 200 and the first group of pins 320 is the A plane of the circuit board 200 (that is, the side facing the connector 400).

[0089] Specifically, during the assembly process, the connector assembly 400 and the circuit board 200 are first independently welded outside the housing 100. At this point, the circuit board 200 is not installed in the inner cavity 110 of the housing 100, and the welding area is completely exposed, making it easy for operators or equipment to precisely machine the welding points of the second set of pins 420. The circuit board 200, with the connector assembly 400 already welded to it, is then installed in the inner cavity 110 of the housing 100. At this point, the side of the circuit board 200 facing the connector assembly 400 is aligned with the first set of pins 320 of the stator assembly 300, and welding is performed on this side through the opening of the housing 100. Because the two welds are completed independently on both sides of the circuit board 200 and the welding sequence is optimized, the problem in the prior art of ineffective welding of the stator assembly 300 pins due to obstruction by the connector assembly 400 is avoided.

[0090] Compared with the prior art, this method separates the soldering operations of the two groups of pins to both sides of the circuit board 200 through a step-by-step soldering strategy, and adjusts the soldering positions according to the assembly sequence of the housing 100, thereby effectively ensuring the soldering quality.

[0091] In another embodiment, the circuit board 200 is first plugged and fixed to the second group of pins 420 outside the shell 100. Thereafter, the circuit board 200 is placed in the inner cavity 110 of the shell 100. The circuit board 200 is welded and fixed to the first group of pins 320 in the inner cavity 110. The welding position of the circuit board 200 and the first group of pins 320 is the A plane of the circuit board 200.

[0092] Specifically, during the assembly process, the connector assembly 400 and the circuit board 200 are first plugged and secured together outside the housing 100. At this point, the circuit board 200 is not restricted by the space within the housing 100, allowing the operator to insert and position the second set of pins 420 in an open environment. After the plug-in connection is complete, the connector assembly 400 and circuit board 200 assembly is installed entirely within the housing 100. With the circuit board 200 positioned within the inner cavity 110, soldering is performed to the stator assembly 300 via the first set of pins 320. Because the soldering position is located on the side of the circuit board 200 facing the connector assembly 400, the operator can directly access the solder joints without having to go around the circuit board 200, thus ensuring sufficient working space for the soldering tool.

[0093] In another embodiment, the circuit board 200 is first installed in the inner cavity 110 of the shell 100. Thereafter, the circuit board 200 is plugged and fixed with the second group of pins 420 in the inner cavity 110 of the shell 100. The circuit board 200 is welded and fixed to the first group of pins 320 in the shell 100. The welding position of the circuit board 200 and the first group of pins 320 is the A plane of the circuit board 200.

[0094] Specifically, during assembly, the connector assembly 400 and the circuit board 200 are first connected and fixed to the inner cavity 110 of the housing 100 via the second set of pins 420, thereby preliminarily constraining the position of the connector assembly 400 relative to the housing 100. Subsequently, the first set of pins 320 of the stator assembly 300 are passed through the circuit board 200 and soldered to the side of the circuit board 200 facing the connector assembly 400. Because the soldering operation surface is located in the unobstructed area between the connector assembly 400 and the stator assembly 300, there is ample operating space, allowing direct soldering of the first set of pins 320. This avoids the difficulty of soldering caused by the bulky size of the connector assembly 400 in the prior art.

[0095] The present application also provides an electric valve, which includes the electromagnetic coil described in any one of the above embodiments.

[0096] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0097] The above-described embodiments merely represent several implementation methods of the present application. 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 a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

[0098] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0099] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0100] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0101] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0102] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate 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 implementation methods.

[0103] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this 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 in that: The invention comprises a housing (100), a circuit board (200), a stator assembly (300), a connector assembly (400) and a cover plate (500), wherein the circuit board (200) has an A plane arranged toward the cover plate (500) and a B plane arranged away from the cover plate (500), the stator assembly (300) has a first group of pins (320), the first group of pins (320) is inserted into the circuit board (200) along a direction from the B plane to the A plane and is welded to the circuit board (200), the housing (100) is provided with an inner cavity (110), the circuit board (200) is arranged in the inner cavity (110), and the cover plate (500) is arranged to cover the opening of the inner cavity (110); The connector assembly (400) has a second group of pins (420), the connector assembly (400) is fixed to the cover plate (500) and is disposed separately from the cover plate (500), and the second group of pins (420) is inserted into the circuit board (200) along a direction from plane A to plane B and is electrically connected to the circuit board (200); The position of the first group of pins (320) on plane A of the circuit board (200) and the orthographic projection of the connector assembly (400) on plane A do not overlap.

2. The electromagnetic coil according to claim 1, wherein The second group of pins (420) is welded to the circuit board (200); Alternatively, the second group of pins (420) is press-fitted to the circuit board (200).

3. The electromagnetic coil according to claim 1, wherein The electromagnetic coil further comprises a grounding pin (800), one end of the grounding pin (800) being connected to the stator housing (310) of the stator assembly (300), and the other end being welded and electrically connected to the circuit board (200), wherein the position of the grounding pin (800) on the circuit board (200) in plane A does not overlap with the orthographic projection of the connector assembly (400) in plane A.

4. The electromagnetic coil according to claim 1, wherein The electromagnetic coil further comprises a plurality of positioning portions (700), one end of each positioning portion (700) being connected to the outer peripheral side of the connector assembly (400), and the other end being in abutment with the inner wall of the inner cavity (110), so that the connector assembly (400) can be limitedly engaged with the housing (100) through the positioning portion (700).

5. The electromagnetic coil according to claim 4, characterized in that The positioning portion (700) includes a plurality of positioning pieces (710) arranged on the outer peripheral side of the connector assembly (400), a portion of the positioning pieces (710) abuts against the inner wall of the housing (100), and another portion of the positioning pieces (710) abuts against the outer wall of the stator assembly (300) extending into the inner cavity (110).

6. The electromagnetic coil according to claim 1, wherein The electromagnetic coil further comprises a plurality of positioning posts (600), one end of each positioning post (600) being fixedly connected to the connector assembly (400) and the other end being passed through the circuit board (200).

7. The electromagnetic coil according to claim 6, characterized in that A step structure is provided on the circumference of the positioning post (600), and when the positioning post (600) is passed through the circuit board (200), the positioning post (600) can be stopped on the A plane of the circuit board (200) by the step structure.

8. The electromagnetic coil according to claim 1, wherein The first group of pins (320) includes a plurality of first pin bodies (321), and the bottom wall of the inner cavity (110) is provided with a first dividing strip (111), and one end of the first dividing strip (111) away from the bottom wall of the inner cavity (110) protrudes toward the circuit board (200) and is stopped between adjacent first pin bodies (321); And / or, the second group of pins (420) includes a plurality of second pin bodies (421), the connector assembly (400) further includes a connector housing (410), the second group of pins (420) is fixed to the connector housing (410), the connector housing (410) is provided with a second partition bar (411), and the second partition bar (411) is protruded toward the circuit board (200) at one end away from the connector housing (410) and is stopped between adjacent second pin bodies (421).

9. The electromagnetic coil according to claim 1, wherein The first group of pins (320) includes a plurality of first pin bodies (321), the second group of pins (420) includes a plurality of second pin bodies (421), and an angle A between an arrangement direction of the plurality of first pin bodies (321) of the first group of pins (320) and an arrangement direction of the plurality of second pin bodies (421) of the second group of pins (420) satisfies the following: 30°≤A≤150°.

10. A method for assembling an electromagnetic coil, characterized in that: The assembly method is used to assemble the electromagnetic coil according to any one of claims 1 to 9, and the assembly method comprises the following steps: The connector assembly (400) is fixedly electrically connected to the circuit board (200) via the second group of pins (420); Placing the circuit board (200) in the inner cavity (110), and fixing the connector assembly (400) to the housing (100); The stator assembly (300) is welded to the circuit board (200) via the first group of pins (320), and the position of the first group of pins (320) on plane A of the circuit board (200) and the orthographic projection of the connector assembly (400) on plane A do not overlap; the cover plate (500) is fixedly sleeved on the outer peripheral side of the second group of pins (420) and fixedly covered at the opening of the inner cavity (110).

11. The method for assembling an electromagnetic coil according to claim 10, wherein: The circuit board (200) is first welded and fixed to the second group of pins (420) outside the housing (100), with the welding position being plane B of the circuit board (200); thereafter, the circuit board (200) is welded and fixed to the first group of pins (320) in the inner cavity (110), with the welding position being plane A of the circuit board (200).

12. The method for assembling an electromagnetic coil according to claim 10, wherein: The circuit board (200) is first plugged and fixed to the second group of pins (420) outside the housing (100), and then the circuit board (200) is welded and fixed to the first group of pins (320) in the inner cavity (110), with the welding position being plane A of the circuit board (200).

13. The method for assembling an electromagnetic coil according to claim 10, wherein: The circuit board (200) is plugged and fixed to the second group of pins (420) in the inner cavity (110) of the housing (100), and the circuit board (200) is welded and fixed to the first group of pins (320) in the housing (100), with the welding position being plane A of the circuit board (200).

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