Electromagnetic device

Abstract

An electromagnetic device belongs to the technical field of low-voltage apparatuses. Comprising a frame, a coil framework and a coil, the coil is wound on the coil framework, the coil framework is contained in the frame, the frame axially limits the coil framework through cooperation of a top plate and a bottom plate, the side, facing the top plate, of the coil framework is provided with a top disc, and the side, facing the bottom plate, of the coil framework is provided with a bottom disc. A positioning piece for preventing the coil framework from rotating is arranged between the top disc and the top plate, an isolation area is arranged on the coil framework, the isolation area is arranged on the top disc, and the edge of the isolation area extends out of the top plate, or the isolation area is arranged on the bottom disc, and the edge of the isolation area extends out of the bottom plate. The side face, facing the coil, of the isolation area is provided with a wire groove for wiring of outgoing lines of the coil. The coil framework has the advantages that on the basis of preventing the coil framework from rotating relative to the framework, the isolation area is arranged at the position of the coil outgoing line so as to effectively guarantee the distance between the outgoing line and the framework, and product miniaturization is facilitated while the working reliability is improved.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical technology, specifically relating to an electromagnetic device. Background Technology

[0002] Electromagnetic devices are widely used. For example, in dual-power automatic transfer switches, an electromagnetic device is used in the operating mechanism as a drive mechanism to drive a turntable to rotate. This causes the moving contact to rotate between three positions: contacting the first stationary contact, contacting the second stationary contact, and an intermediate position where it is separated from both stationary contacts. This achieves the three-position switching of the dual-power automatic transfer switch. Of course, when the turntable rotates, it can also drive a pair of drive linkages to open and close one actuator on one side to connect and disconnect the first power supply, and drive another actuator on the other side to open and close the second power supply.

[0003] In existing electromagnetic devices, the coil frame is mounted on the device's frame with unlimited radial displacement. Furthermore, due to miniaturization, the distance between the coil winding and the edge of the coil frame is small. In practical applications, vibration causes the coil frame to rotate, resulting in radial deflection. This further reduces the distance between the coil leads and the frame. In extreme cases, the coil leads and frame may break down due to the excessively small distance, causing the electromagnetic device to fail and ultimately leading to switching failure. To address this, the applicant has developed a beneficial design, and the technical solution described below arose from this context. Utility Model Content

[0004] The purpose of this invention is to provide an electromagnetic device that, while preventing the coil frame from rotating relative to the frame, provides an isolation zone at the location of the coil lead wire to effectively ensure the distance between the lead wire and the frame, thereby improving operational reliability and facilitating product miniaturization.

[0005] The purpose of this utility model is achieved as follows: an electromagnetic device includes a frame, a coil skeleton, and a coil. The coil is wound on the coil skeleton, and the coil skeleton is housed within the frame. The frame axially limits the coil skeleton through the cooperation of a top plate and a bottom plate. The coil skeleton has a top plate on the side facing the top plate and a bottom plate on the side facing the bottom plate. A positioning element is provided between the top plate and the top plate to prevent the coil skeleton from rotating. An isolation area is provided on the coil skeleton. The isolation area is on the top plate and its edge extends beyond the top plate, or the isolation area is on the bottom plate and its edge extends beyond the bottom plate. A groove for the coil lead wire to run on the side of the isolation area facing the coil is formed.

[0006] In a specific embodiment of this utility model, a lead wire cavity is formed in the isolation area, and the lead wire cavity forms the wire groove facing the coil opening. A wiring opening communicating with the lead wire cavity is formed at the edge of the isolation area.

[0007] In another specific embodiment of this utility model, the radial dimension of the outer wall of the lead wire cavity is greater than the radial dimension of the inner wall.

[0008] In another specific embodiment of this utility model, the electromagnetic device further includes a spring, a push rod, a moving iron core, and a stationary iron core. The coil frame further includes a tube connecting the top plate and the bottom plate. The coil is wound on the tube. The stationary iron core is fixed in the middle of the top plate. The top plate has a top plate through hole in the middle. The stationary iron core has a stationary iron core through hole corresponding to the top plate through hole. The moving iron core is disposed in the tube. One end of the spring abuts against the stationary iron core, and the other end abuts against the moving iron core. One end of the push rod has a head, and the other end has a threaded end. The threaded end of the push rod passes through the top plate through hole, the stationary iron core through hole, and the spring in sequence, and is screwed into the groove opened in the axial direction of the moving iron core. The head of the push rod abuts against the side of the top plate opposite to the coil frame and is limited.

[0009] In another specific embodiment of this utility model, the top plate is rectangular, the top plate of the coil skeleton is circular, and the top plate is provided with a pair of positioning bosses symmetrically arranged around the central axis of the tube as positioning elements on the side facing the top plate. The top plate is fitted between the pair of positioning bosses, and the inner surfaces of the pair of positioning bosses facing each other are fitted with the two long edges of the top plate in the length direction.

[0010] In another specific embodiment of this utility model, the two ends of the top plate in the length direction are bent toward the bottom plate to form a pair of side plates. The bottom plate has a pair of bottom plate holes at both ends in the length direction. The pair of side plates are fixedly connected to the top plate by mounting bosses protruding toward the bottom plate and engaging with the pair of bottom plate holes.

[0011] In a further specific embodiment of this utility model, the base plate has a through hole in the middle of a pair of base plate holes, and the base plate of the coil bobbin has a base plate annular boss extending along the tube on the side facing the base plate, and the base plate annular boss is fitted into the through hole.

[0012] This invention features a positioning element between the top plate of the frame and the top plate of the coil skeleton to prevent rotation of the coil skeleton. An isolation zone is then provided on the coil skeleton, either on the top plate with its edge extending beyond the top plate, or on the bottom plate with its edge extending beyond the bottom plate. A groove is provided on the side of the isolation zone facing the coil for the coil's lead wires to run through. Thus, while preventing rotation of the coil skeleton relative to the frame, the grooves position the coil's lead wires relative to the coil skeleton. Furthermore, the isolation zone at the location of the coil lead wires effectively ensures the distance between the lead wires and the frame, preventing breakdown due to insufficient distance and thus avoiding electromagnetic device failure. This also facilitates the miniaturization of the electromagnetic device. Attached Figure Description

[0013] Figure 1 This is a perspective view of the electromagnetic device described in this utility model;

[0014] Figure 2 This is an exploded view of the electromagnetic device described in this utility model;

[0015] Figure 3 This is a schematic diagram showing the fit between the top plate and the stationary iron core described in this utility model;

[0016] Figure 4 This is a schematic diagram of the coil frame described in this utility model from one perspective;

[0017] Figure 5 This is a partial cross-sectional schematic diagram of the edge of the isolation zone described in this utility model;

[0018] Figure 6 This is a schematic diagram of the coil frame described in this utility model from another perspective.

[0019] In the diagram: 1. Frame, 11. Top plate, 111. Top plate through hole, 112. Long edge, 113. Screw hole, 12. Bottom plate, 121. Bottom plate through hole, 122. Bottom plate through hole, 123. Long edge, 13. Side plate, 131. Mounting boss; 2. Coil frame, 20. Isolation zone, 200. Lead wire cavity, 201. Wire groove, 202. Isolation zone edge, 203. Wiring opening, 204. Outer wall, 205. Inner wall, 21. Top plate, 211. Positioning boss, 2111. Inner side, 22. Base plate, 221. Base plate annular boss, 222. Base plate edge, 23. Tube body, 231. Intermediate cavity; 3. Coil, 31. Lead wire; 4. Spring; 5. Top rod, 51. Head; 6. Moving iron core, 61. Groove; 7. Stationary iron core, 71. Static iron core through hole, 72. Static iron core annular boss. Detailed Implementation

[0020] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0021] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0022] See Figures 1 to 3 This utility model relates to an electromagnetic device, including a frame 1, a coil skeleton 2, a coil 3, a spring 4, a push rod 5, a moving iron core 6, and a stationary iron core 7. The coil skeleton 2 is housed within the frame 1, which includes a top plate 11 and a bottom plate 12. The coil skeleton 2 has a top plate 21 on the side facing the top plate 11 and a bottom plate 22 on the side facing the bottom plate 12. The top plate 21 and the bottom plate 22 are connected by a tube 23. Both the top plate and the bottom plate have a circular hole at their center that communicates with the central cavity 231 of the tube 23. The coil 3 is wound around the tube 23. The stationary iron core 7 is fixed to the middle of the top plate 11. The top plate 11 has a top plate through hole 111 in the middle. The stationary iron core 7 has a corresponding stationary iron core through hole 71, and a stationary iron core annular boss 72 is formed along the stationary iron core through hole 71 and extends toward the top plate through hole 111. The stationary iron core annular boss 72 is fitted into the top plate through hole 111 and fastened, thereby fixing the stationary iron core 7 to the top plate 11. The moving iron core 6 is disposed in the tube body 23. One end of the spring 4 abuts against the stationary iron core 7, and the other end abuts against the moving iron core 6. The push rod 5... One end has a head 51, and the other end has a threaded end. The threaded end of the push rod 5 passes through the top plate through hole 111, the stationary iron core through hole 71, and the spring 4 in sequence, and is then screwed into the groove 61 opened in the axial direction of the moving iron core 6. The inner wall of the groove 61 is provided with a step for the other end of the spring 4 to abut against. This is a known technology and is therefore not shown in the figure. The head 51 of the push rod 5 abuts against the side of the top plate 11 opposite to the coil frame 2 for limiting, thereby completing the assembly of the electromagnetic device. The spring 4, the moving iron core 6, and the stationary iron core 7 are all located in the middle cavity 231 of the tube body 23. In the initial state when the coil 3 is not energized, the spring force provided by the spring 4 between the moving iron core 6 and the stationary iron core 7 keeps a certain distance between the moving iron core 6 and the stationary iron core 7.

[0023] See Figure 3 and combined Figure 2The top plate 11 is rectangular, with its two ends bent perpendicularly along its length to form a pair of side plates 13. The pair of side plates 13 are identical in size, forming an "n"-shaped structure. The top plate 11 has at least one pair of screw holes 113 for screwing in fixing screws to secure the entire electromagnetic device to the corresponding location. The bottom plate 12 is also rectangular and has a pair of bottom plate mating holes 122 at both ends along its length. The pair of side plates 131 are fastened to the top plate 11 and the bottom plate 12 by mounting bosses 131 protruding towards the bottom plate 12 and engaging with the pair of bottom plate mating holes 122. Preferably, the mounting bosses 131 are fastened to the pair of bottom plate mating holes 122 by riveting.

[0024] See Figure 4 and combined Figure 1 A positioning element is provided between the top plate 21 and the top plate 11 of the coil frame 2 to prevent the coil frame 2 from rotating. In this embodiment, both the top plate 21 and the bottom plate 22 are circular. The top plate 21 has a pair of positioning bosses 211 symmetrically arranged around the central axis of the tube body 23 extending towards the top plate 11, which serve as the positioning element. The top plate 11 is fitted between the pair of positioning bosses 211. The inner surfaces 2111 of the pair of positioning bosses 211 facing each other are fitted with the two long edges 112 along the length of the top plate 11, thereby preventing the coil frame 2 from rotating. Of course, the positioning element is not limited to the symmetrical positioning bosses 211 structure given in this embodiment. It can also be a protrusion extending towards the top plate 11 on the top plate 21, with a hole opened at the corresponding position on the top plate 11. Fitting the protrusion with the hole can also prevent the coil frame 2 from rotating around the axis.

[0025] See you later Figure 4 and combined Figure 5 , Figure 6 The coil frame 2 has an isolation area 20 on the chassis 22 extending beyond the base plate 12. The isolation area 20 has a groove 201 on its side facing the coil 3 for the lead wire 31 of the coil 3 to run through. In this embodiment, the edge 202 of the isolation area 20 has a larger radius than the edge 222 of the chassis body. Of course, the edge 202 of the isolation area is not limited to the arc shape given in this embodiment; it can also be any straight shape, as long as the edge 202 of the isolation area is located outside the long edge 123 of the base plate 12.

[0026] A lead wire cavity 200 is formed within the isolation zone 20. Specifically, the lead wire cavity 200 is formed within the thickness space of the isolation zone 20. This can be understood as the outer sidewall 204 near the base plate 12, the lead wire cavity 200, and the inner sidewall 205 near the coil 3 being arranged sequentially along the thickness direction of the chassis 22. The lead wire cavity 200 opens towards the coil 3 to form a wire groove 201, i.e., the wire groove 201 is located on the inner sidewall 205. In this embodiment, the wire groove 201 is a narrow slit-shaped groove extending from the edge 202 of the isolation zone 20 towards the tube body 23. The isolation zone 20 also forms a wiring opening 203 at the edge 202 of the isolation zone, which communicates with the lead wire cavity 200. The radial dimension of the outer sidewall 204 of the lead-out cavity 200 facing the base plate 12 is greater than the radial dimension of the inner sidewall 205 facing the coil 3, thereby forming an inverted L-shaped opening on the surface of the chassis 22 facing the coil 3.

[0027] At the beginning of winding coil 3, see Figure 4 The operator can insert one end of the coil 3 from the wire groove 201 into the lead wire cavity 200 to the right, limiting the wire end, and then wind it on the tube 23, thereby increasing the convenience of the winding process. When the coil frame 2 and the coil 3 are installed in the frame 1, since the wire end, i.e., the lead wire 31 of the coil 3, is located in the wire groove 201 (see... Figure 1 (The solid lead wire in the image) or located in the lead wire cavity 200 and running along the inner wall 205 (see [reference]). Figure 1 The dotted lead-out line in the image is located in the isolation area 20, and the wire groove 201 and the lead-out line cavity 200 are both located in the isolation area 20. The isolation area edge 202 of the isolation area 20 extends to the edge of the bottom plate 12, effectively ensuring the spacing between the lead-out line 31 and the frame 1.

[0028] The electromagnetic device of this invention, by incorporating a positioning element to prevent the coil frame 2 from rotating and an isolation zone 20 on the coil frame 2, avoids the coil frame 2 from rotating due to vibration, which could cause the lead wire 31 of the coil 3 to break down between the lead wire 31 and the frame 1 due to excessively small spacing, thus preventing the electromagnetic device from malfunctioning. Because effective measures have been taken to prevent breakdown between the lead wire 31 of the coil 3 and the frame 1 due to insufficient spacing, the dimensions of the remaining parts of the top plate 21 and bottom plate 22, excluding the isolation zone 20, can be reduced. Correspondingly, the dimensions of the frame 1 can also be reduced, which is beneficial for miniaturization of the electromagnetic device.

[0029] Furthermore, the top plate 11 and the top plate 21, and the bottom plate 12 and the bottom plate 22 cooperate to achieve axial positioning of the coil frame 2; the bottom plate 12 has a bottom plate through hole 121 in the middle of a pair of bottom plate holes 122, and the bottom plate 22 of the coil frame 2 has a bottom plate annular boss 221 extending along the tube body 23 on the side facing the bottom plate 12. The bottom plate annular boss 221 is fitted into the through hole 121, thereby preventing the coil frame 2 from moving radially relative to the frame 1.

[0030] Of course, this utility model is not limited to the embodiment where the isolation area 20 is located on the chassis 22. In the above embodiment, a portion of the edge of the chassis 22 extends to the outside of the base plate 12 to form the isolation area 20. Alternatively, the isolation area 20 can be provided on the top plate 21, with a portion of the edge of the top plate 21 extending to the outside of the top plate 11 to form the isolation area 20. It can be seen that the isolation area 20 and the positioning element that prevents the coil frame 2 from rotating can be provided on the same side of the coil 3, that is, both can be provided on the top plate 21. Alternatively, the isolation area 20 and the positioning element can be provided on opposite sides of the coil 3, that is, the positioning element can be provided on the top plate 21 and the isolation area 20 can be provided on the chassis 22. Furthermore, this utility model is not limited to the above-described embodiment in which the head 51 of the push rod 5 is fitted with the stationary iron core 7 and the top plate 11. Alternatively, a through hole can be opened on the base plate 12 for the push rod 5 to pass through, and the head 51 of the push rod 5 can be restrained by abutting against the side of the base plate 12 facing away from the coil frame 2, thereby fixing the stationary iron core 7 to the base plate 12. At the same time, a structural feature for preventing radial movement between the coil frame 2 and the frame 1 is provided between the top plate 21 and the top plate 11, that is, a corresponding annular boss is provided on the top plate 21 and fitted into the through hole opened on the top plate 11. In this case, the push rod 5 can be inserted from the top plate 11. Figure 2 The right side of the base plate 12 is screwed into the groove 61 of the moving iron core 6 inside the tube body 23 through the left side of the base plate 12. The right end of the spring 4 abuts against the stationary iron core 7 fixed on the base plate 12, and the left end abuts against the moving iron core 6.

[0031] Finally, it should be noted that this utility model aims to effectively isolate the lead wire 31 of the coil 3 from the frame 1. The top plate 11 and bottom plate 12 are not limited to rectangles, and the top plate 21 and bottom plate 22 are not limited to circles. The rectangular top plate 11 and the circular top plate 12 are used as examples to illustrate how the positioning between the top plate 11 and the top plate 21 prevents the coil frame 2 from rotating. The rectangular bottom plate 12 and the circular bottom plate 22 are used as examples to illustrate how to set up the isolation zone 20.

Claims

1. An electromagnetic device comprising a frame (1), a coil frame (2), and a coil (3), wherein the coil (3) is wound on the coil frame (2), the coil frame (2) is housed within the frame (1), the frame (1) axially restricting the coil frame (2) through the cooperation of a top plate (11) and a bottom plate (12), wherein the coil frame (2) has a top plate (21) on the side facing the top plate (11) and a bottom plate (22) on the side facing the bottom plate (12), characterized in that: A positioning element is provided between the top plate (21) and the top plate (11) to prevent the coil frame (2) from rotating. An isolation area (20) is provided on the coil frame (2). The isolation area (20) is on the top plate (21) and its edge extends to the outside of the top plate (11), or the isolation area (20) is on the chassis (22) and its edge extends to the outside of the bottom plate (12). The isolation area (20) has a wire groove (201) on the side facing the coil (3) for the lead wire (31) of the coil (3) to run.

2. The electromagnetic device according to claim 1, characterized in that: An outlet cavity (200) is formed in the isolation zone (20). The outlet cavity (200) faces the coil (3) and opens to form the wire groove (201). The isolation zone (20) forms a wiring opening (203) at the edge (202) of the isolation zone that communicates with the outlet cavity (200).

3. An electromagnetic device according to claim 2, characterized in that: The radial dimension of the outer wall (204) of the lead-out cavity (200) is greater than the radial dimension of the inner wall (205).

4. An electromagnetic device according to claim 1, characterized in that: It also includes a spring (4), a push rod (5), a moving iron core (6), and a stationary iron core (7). The coil frame (2) also includes a tube (23) connecting the top plate (21) and the base plate (22). The coil (3) is wound on the tube (23). The stationary iron core (7) is fixed in the middle of the top plate (11). The top plate (11) has a top plate through hole (111) in the middle. The stationary iron core (7) has a stationary iron core through hole (71) corresponding to the top plate through hole (111). The moving iron core (6) is provided with... Inside the tube (23), one end of the spring (4) abuts against the stationary iron core (7), and the other end abuts against the moving iron core (6). One end of the push rod (5) has a head (51), and the other end has a threaded end. The threaded end of the push rod (5) passes through the top plate through hole (111), the stationary iron core through hole (71), and the spring (4) in sequence and is screwed into the groove (61) opened in the axial direction of the moving iron core (6). The head (51) of the push rod (5) abuts against the side of the top plate (11) facing away from the coil frame (2) and is limited.

5. An electromagnetic device according to claim 4, characterized in that: The top plate (11) is rectangular, and the top plate (21) of the coil frame (2) is circular. The top plate (21) has a pair of positioning bosses (211) arranged symmetrically about the central axis of the tube body (23) on the side facing the top plate (11) as positioning elements. The top plate (11) is fitted between the pair of positioning bosses (211). The inner surfaces (2111) of the pair of positioning bosses (211) facing each other are fitted with the two long edges (112) of the top plate (11) in the length direction.

6. An electromagnetic device according to claim 1, characterized in that: The top plate (11) is bent toward the bottom plate (12) at both ends along its length to form a pair of side plates (13). The bottom plate (12) has a pair of bottom plate holes (122) at both ends along its length. The pair of side plates (13) are fastened to the top plate (11) and the bottom plate (12) by mounting bosses (131) protruding toward the bottom plate (12) and the pair of bottom plate holes (122).

7. An electromagnetic device according to claim 6, characterized in that: The base plate (12) has a through hole (121) in the middle of a pair of base plate holes (122). The base plate (22) of the coil frame (2) has a base plate annular boss (221) extending along the tube body (23) on the side facing the base plate (12). The base plate annular boss (221) is fitted into the through hole (121).

Images