Electromagnetic relay

Abstract

The utility model discloses an electromagnetic relay, which comprises a base, a pushing card, a magnetic circuit part and a contact part, the magnetic circuit part and the contact part are mounted on the base, the contact part comprises a movable spring part and a static spring part, and the movable spring part comprises a movable spring sheet and a movable contact arranged on the movable spring sheet; the pushing card comprises a first edge and a second edge fixed relative to the first edge, the first edge and the second edge intersect or intersect by extension lines, the first edge is driven by the armature of the magnetic circuit part to swing, and the second edge is matched with the free end of the movable contact spring; when the pushing clamp is driven by the armature to swing, the movable spring part and the static spring part are driven to be connected or disconnected. And the contact part is positioned in a space formed between the first edge and the second edge. According to the utility model, the occupied space of the pushing card between the magnetic circuit part and the movable spring part is greatly reduced, so that the whole internal structure is more compact, and the miniaturization design of the product is easy to realize.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to an electromagnetic relay. Background Art

[0002] An electromagnetic relay is an electronic control device that is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] An electromagnetic relay in the prior art includes a magnetic circuit part, a moving spring part, a static spring part and a push card. The push card is usually movably arranged between the magnetic circuit part and the moving spring part along a preset direction, and is driven by the armature of the magnetic circuit part to drive the moving spring piece of the spring part to move, so as to achieve contact closure or disconnection. Since the push card itself occupies a certain space and also requires a certain space to move, the push card occupies a large space between the magnetic circuit part and the moving spring part, resulting in a large size of the relay in the moving direction of the push card, which is not conducive to the miniaturization design of the product. Utility Model Content

[0004] The utility model aims at the technical problems existing in the prior art and provides an electromagnetic relay, which improves the structure and movement mode of a push card so that the overall structure is more compact, which is conducive to realizing product miniaturization.

[0005] The utility model adopts the following technical scheme to solve the technical problem: an electromagnetic relay comprises a base, a push card, a magnetic circuit part and a contact part installed on the base, the contact part comprises a moving spring part and a static spring part, the moving spring part comprises a moving spring sheet and a moving contact point arranged on the moving spring sheet; the push card comprises a first side and a second side relatively fixed to the first side, the first side intersects with the second side or the extension line intersects with the second side, the first side is driven to swing by the armature of the magnetic circuit part, and the second side cooperates with the free end of the moving spring sheet, so that when the push card is driven to swing by the armature, it drives the moving spring part and the static spring part to be closed or disconnected; the contact part is located in the space formed between the first side and the second side.

[0006] Furthermore, the first side of the push card is swingably connected to the base; and the housing is also included, which is connected to the base and contains the push card, the magnetic circuit part, the moving spring part and the static spring part in its housing cavity.

[0007] Furthermore, the first side tail portion of the push card is forked into two legs distributed along its width direction and can be elastically deformed, and the tails of the two legs are respectively provided with a rotating shaft, and the two rotating shafts are respectively movably inserted into the corresponding axial holes of the base, so that the push card uses the axes of the two rotating shafts as the swing axis.

[0008] Furthermore, the armature is L-shaped, one side of which is used for magnetic attraction, and the other side is located on the side of the first side of the pushing card facing away from the movable spring part, so as to push the first side of the pushing card to swing; the first side facing the armature is provided with two first baffles distributed along its width direction, and the other side of the armature is located between the two first baffles; the magnetic circuit part also includes a restoring spring sheet, which presses against the armature to limit the armature on the cutting edge of the yoke of the magnetic circuit part.

[0009] Furthermore, one side of the first side of the push card is provided with two second baffles distributed along the width direction thereof, the glue port of the push card is located between the two second baffles, and the protrusion of the glue port relative to the side where it is located is smaller than the protrusion of the second baffle relative to the side where it is located; the two second baffles and the two first baffles are located on the same side of the first side and are connected one by one, and the protrusion of the second baffle relative to the side where it is located is smaller than the protrusion of the first baffle relative to the side where it is located.

[0010] Furthermore, the second side of the push card is close to the inner top surface of the shell, and the first side and the second side of the push card are transitioned by a bevel; the two opposite inner side surfaces of the shell are provided with limiting ribs corresponding to the push card, and the push card is fitted between the limiting ribs on both sides of the shell, and the bottom of the limiting rib is inserted into the corresponding slot of the base.

[0011] Furthermore, the second side of the push card covers the contact gap between the dynamic spring part and the static spring part, and the free end of the dynamic spring sheet is passed through the card hole set on the second side of the push card; the inner top surface of the shell is provided with a yield groove corresponding to the free end of the dynamic spring sheet.

[0012] Furthermore, the static spring part includes two static spring sheets, which are respectively installed on the base, and each static spring sheet is provided with a static contact; the dynamic spring sheet is located between the two static spring sheets, and the number of dynamic contacts on the dynamic spring sheet is two, the two dynamic contacts are arranged back to back, and correspond one by one to the static contacts of the two static spring sheets respectively.

[0013] Furthermore, it also includes a button, which includes a button body and a pushing part arranged together, the button body is movably mounted in the mounting groove provided in the shell, the pushing part passes through the through hole provided on the bottom surface of the mounting groove to enter the shell, and when the button body is pressed, it pushes the armature to move the armature to the attracted position; the button body is provided with an elastic part for resetting the button and protruding laterally, and the elastic part abuts against the bottom surface of the mounting groove; the button body is rotatable, and the inner side surface of the mounting groove is provided with a limiting groove on the rotation path of the button body, and the button body is rotated in the pressed state to make the elastic part enter or exit the limiting groove, and after the elastic part enters the limiting groove, the button is kept in the pressed state.

[0014] Furthermore, it also includes a top cover, which is connected to the top of the shell, and the top cover is provided with a limiting hole, which is connected to the installation slot. When the button is installed, the head of the button body passes upward through the limiting hole, and when the button is pressed, the head of the button body is limited above the limiting hole, and the elastic part cannot pass through the limiting hole; the top cover is provided with an observation window for observing the position change of the second side; the shell is made of transparent material.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. Since the push card includes a first side and a second side fixed relatively to the first side, the first side intersects with the second side or the extension lines intersect, the first side is driven to swing by the armature of the magnetic circuit part, and the second side cooperates with the free end of the moving spring piece; the contact part is located in the space formed between the first side and the second side, so that the space occupied by the push card of the utility model between the magnetic circuit part and the moving spring part is greatly reduced, thereby making the overall internal structure more compact and making it easy to realize miniaturized design of the product. In particular, for the conversion type relay, the push card does not need to pass through one of the static springs to cooperate with the moving spring part, so that the static spring does not need to be provided with a clearance hole.

[0017] 2. The first side tail of the push card is forked into two legs distributed along its width direction and elastically deformable. The tails of the two legs are respectively provided with a rotating shaft, which makes it easier to connect the push card with the base and can reduce the generation of plastic chips, thereby reducing the impact of plastic chips on the mechanical properties of the product.

[0018] 3. The other side of the armature is located between the two first baffles arranged on the first side of the push card. Combined with the limit of the armature by the restoring spring, the position of the armature remains stable and the action is reliable.

[0019] 4. The glue port of the push card is located between the two second baffles provided on the first side of the push card, which can reduce the wear of the glue port caused by the stacking of parts after the push card is formed, thereby reducing the generation of plastic scraps, and further reducing the impact of plastic scraps on the mechanical properties of the product. In particular, the first baffle is integrally connected with the second baffle, which helps to improve the strength of the first side of the push card.

[0020] 5. A clearance groove is provided on the inner top surface of the shell corresponding to the tail of the second end of the moving spring. On the one hand, it can reduce the friction between the moving spring and the inner top surface of the shell to produce plastic chips. On the other hand, in the conversion product, the clearance groove can be used to increase the creepage distance between the two sets of contacts.

[0021] 6. The button body is provided with an elastic part that is used to reset the button and protrudes laterally, which not only reduces the number of parts and material costs, but also allows the utility model to be assembled automatically. In addition, since the button body is rotatable, the inner side of the installation groove is provided with a limit groove for the elastic part to enter and exit on the rotation path of the button body, so that the utility model can also limit the button in the pressed state, thereby facilitating the test of the tester. Moreover, the utility model directly uses the elastic part and the limit groove to limit the button in the pressed state, which has a simpler structure and is easier to process and form.

[0022] 7. The utility model further includes the top cover, which can make the overall appearance more concise and beautiful, and can further limit the position of the button to prevent the button from accidentally falling off. In particular, the top cover is provided with an observation window for observing the position change of the second side, and the shell is made of transparent material, so that the staff can easily observe the pushing card action and the closing of the contact.

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the electromagnetic relay of the utility model is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an exploded schematic diagram of the utility model;

[0025] Figure 2 It is a three-dimensional structural schematic diagram of the push card of the utility model;

[0026] Figure 3 It is a three-dimensional structural schematic diagram of the magnetic circuit part of the utility model (the armature is in a disassembled state);

[0027] Figure 4 It is a three-dimensional structural schematic diagram of the base, static spring part and dynamic spring part of the utility model in the assembled state;

[0028] Figure 5It is a three-dimensional structural schematic diagram of the base, magnetic circuit part, etc. of the utility model in an assembled state;

[0029] Figure 6 yes Figure 1 A magnified schematic diagram of part A;

[0030] Figure 7 It is a three-dimensional structural schematic diagram of the button of the utility model;

[0031] Figure 8 It is a partial enlarged schematic diagram of the top cover of the utility model;

[0032] Fig. 9 It is a schematic diagram of the three-dimensional structure of the utility model before the button is pressed;

[0033] Fig.10 is a cross-sectional view of the utility model before the button is pressed;

[0034] Fig.11 yes Fig.10 A magnified schematic diagram of part B;

[0035] Fig.12 It is a schematic diagram of the three-dimensional structure of the utility model after the button is pressed;

[0036] Fig.13 is a cross-sectional view of the utility model after the button is pressed;

[0037] Fig.14 yes Fig.13 A magnified schematic diagram of part C;

[0038] Fig.15 It is a schematic diagram of the three-dimensional structure of the utility model after the button is rotated;

[0039] Fig.16 This is a cross-sectional view of the utility model after the button is rotated. Figure 1 ;

[0040] Fig.17 yes Fig.16 An enlarged schematic diagram of part D in the middle;

[0041] Fig.18 This is a cross-sectional view of the utility model after the button is rotated. Figure 2 ;

[0042] In the figure, 1, housing, 11, mounting groove, 111, through hole, 12, limiting groove, 13, convex block, 14, limiting convex part, 15, giving way groove, 16, limiting convex rib, 2, button, 21, button body, 211, recessed part, 22, pushing part, 221, inclined section, 222, connecting section, 23, elastic rod, 3, top cover, 31, limiting hole, 311, arc notch, 32, sinking groove, 33, observation window, 4, magnetic circuit part, 41, armature, 411, inclined surface, 42. iron core, 43. yoke, 44. coil frame, 45. coil, 46. restoring spring, 461. flange, 5. moving spring part, 51. moving spring, 52. moving contact, 6. static spring part, 61. static spring, 62. static contact, 7. push card, 71. first side, 711. first baffle, 712. glue mouth, 713. second baffle, 714. support leg, 715. rotating shaft, 72. second side, 721. card hole, 73. bevel edge, 8. base, 81. shaft hole. DETAILED DESCRIPTION

[0043] In the present invention, the directions or positional relationships indicated by "upper", "lower", "left", "right", "inner", "outer", "top / bottom" and the like in the description are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more. In the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] See also Figure 1-Figure 18As shown, an electromagnetic relay of the utility model includes a base 8, a housing 1, a push card 7, and a magnetic circuit part 4 and a contact part installed on the base 8, wherein the contact part includes a moving spring part 5 and a static spring part 6. The moving spring part 5 includes a moving spring sheet 51, and a moving contact 52 is arranged on the moving spring sheet 51. The housing 1 is connected to the base 8, and contains the push card 7, the magnetic circuit part 4, the moving spring part 5 and the static spring part 6 in its shell cavity. The push card 7 includes a first side 71 and a second side 72 fixed relatively to the first side 71, and the first side intersects with the second side or the extension line intersects with the second side. Specifically, the first side 71 and the second side 72 roughly form an L shape, and the two can be integrally formed, or they can be formed separately and then connected together by assembly. The first edge 71 is driven to swing by the armature 41 of the magnetic circuit part, and the second edge 72 cooperates with the free end of the movable spring piece 51, so that when the push card 7 is driven by the armature 41 to swing, it drives the movable spring part 5 and the static spring part 6 to close or disconnect; the contact part is located in the space formed between the first edge 71 and the second edge 72.

[0046] In this embodiment, the magnetic circuit part 4 is vertical, and in addition to the armature 41, the magnetic circuit part 4 also includes a yoke 43, a coil frame 44, a coil 45 wound on the coil frame 44, and an iron core 42 inserted into the coil frame 44. The yoke 43 is L-shaped, one side of which is riveted and fixed to the bottom end of the iron core 42, and the other side is located outside the coil frame 44. The armature 41 is swingably arranged at the edge of the other side of the yoke 43. The first side 71 of the push card 7 is swingably connected to the base 8. Specifically, as Figure 2 As shown, the tail of the first side 71 of the push card 7 is forked into two legs 714 distributed along its width direction and elastically deformable, and the tails of the two legs 714 are respectively provided with a rotating shaft 715, and the two rotating shafts 715 are arranged back to back, but not limited to this. In other embodiments, the two rotating shafts 715 are arranged opposite to each other. The two rotating shafts 715 are respectively movably arranged through the corresponding shaft holes 81 of the base 8, so that the push card 7 uses the axes of the two rotating shafts 715 as the swing axis. During installation, the two legs 714 are squeezed to make the two legs 714 elastically deform inward relative to each other, so that the two rotating shafts 715 can be smoothly inserted into the two shaft holes 81 corresponding to the base 8; after the two legs 714 are released, the two legs 714 are elastically reset, so that the two rotating shafts 715 remain in the state of being stuck in the shaft holes 81.

[0047] like Figure 3As shown, the armature 41 is L-shaped, one side of which is used for magnetic attraction, that is, for magnetically matching with the top of the iron core 42 of the magnetic circuit part 4. The other side of the armature 41 is located on the side of the first side 71 of the push card 7 facing away from the movable spring part 5, so as to push the first side 71 of the push card 7 to swing. The other side of the armature 41 is roughly T-shaped with a wide head and a narrow tail, which is conducive to saving materials. The part where the other side of the armature 41 matches with the first side 71 of the push card 7 is set as an inclined surface 411, so that the other side of the armature 41 and the first side 71 of the push card 7 are in surface contact as much as possible, thereby reducing the friction between the two to produce plastic chips. The side of the first side 71 of the push card 7 facing the armature 41 is provided with two first baffles 711 distributed along its width direction, and the other side of the armature 41 is located between the two first baffles 711. A restoring spring 46 is connected to the yoke 43 of the magnetic circuit part 4, and the restoring spring 46 abuts against the armature 41 to limit the armature 41 on the edge of the yoke 43. Therefore, the other side of the armature 41 is limited in the width direction of the product by the two first baffles 711 of the push card 7, and the armature 41 is limited in the height direction of the product in combination with the restoring spring 46, so that the position of the armature 41 remains stable and the operation is reliable. The restoring spring 46 is provided with a flange 461 at the tail of the other side of the armature 41, which controls the minimum gap between the tail of the other side of the armature 41 and the yoke 43 in the released state, thereby controlling the size of the magnetic gap between the yoke 43 and the iron core 42.

[0048] like Figure 2 As shown, one side of the first side 71 of the push card 7 is provided with two second baffles 713 distributed along the width direction thereof, the glue port 712 of the push card 7 is located between the two second baffles 713, and the protrusion of the glue port 712 relative to the side thereof is smaller than the protrusion of the second baffle 713 relative to the side thereof. In this way, the wear of the glue port 712 caused by the stacking of parts after the push card 7 is formed can be reduced, thereby reducing the generation of plastic scraps, and further reducing the influence of the plastic scraps on the mechanical properties of the product. The two second baffles 713 and the two first baffles 711 are located on the same side of the first side 71 and are connected one by one, and the protrusion of the second baffle 713 relative to the side thereof is smaller than the protrusion of the first baffle 711 relative to the side thereof, so that the interference of the second baffle 713 with the base 8 due to the excessive protrusion can be avoided, and the strength of the first side 71 of the push card 7 can be improved.

[0049] In this embodiment, the second side 72 of the push card 7 is close to the inner top surface of the housing 1, and the first side 71 and the second side 72 of the push card 7 are transitioned by a bevel 73 to prevent the transition portion between the first side 71 and the second side 72 of the push card 7 from interfering with the inner top surface of the housing 1 during the swinging process. The two opposite inner side surfaces of the housing 1 are provided with limiting ribs 16 corresponding to the push card 7, and the push card 7 is fitted between the limiting ribs 16 on both sides of the housing 1, and the bottom of the limiting ribs 16 is inserted into the corresponding slots of the base 8.

[0050] In this embodiment, the static spring part 6 includes two static spring pieces 61, which are respectively mounted on the base 8, and each static spring piece 61 is provided with a static contact 62 on the top; the dynamic spring piece 51 is located between the two static spring pieces 61, and the number of the dynamic contacts 52 on the free end of the dynamic spring piece 51 is two, and the two dynamic contacts 52 are arranged back to back and correspond to the static contacts 62 of the two static spring pieces 61 one by one. Therefore, the utility model constitutes a conversion relay with two groups of contacts, one normally closed and one normally open. The second side 72 of the push card 7 crosses the static spring piece 61 adjacent to it. The second side 72 of the push card 7 covers the contact gap between the dynamic spring part 5 and the static spring part 6, which can increase the creepage distance between the two groups of contacts. The free end of the moving spring 51 is inserted into the card hole set on the second side 72 of the push card 7; the inner top surface of the shell 1 is provided with a clearance groove 15 corresponding to the free end of the moving spring 51. In this way, on the one hand, the friction between the moving spring 51 and the inner top surface of the shell 1 to generate plastic chips can be reduced, and on the other hand, the clearance groove 15 can be used to increase the creepage distance between the two sets of contacts.

[0051] The utility model also includes a button 2, which includes a button body 21 and a push portion 22 provided on the button body 21. The button body 21 is movably mounted on the mounting groove 11 provided on the top of the housing 1, and the push portion 22 enters the housing 1 through the through hole provided on the bottom surface of the mounting groove 11, and pushes the armature 41 of the magnetic circuit part 4 when the button body 21 is pressed, so that the armature 41 moves to the suction position. The button body 21 is integrally formed with an elastic portion for resetting the button 2 and protruding laterally, and the elastic portion abuts against the bottom surface of the mounting groove 11. The button body 21 is rotatable, and the inner side surface of the mounting groove 11 is provided with a limiting groove 12 on the rotation path of the button body 21. The button body 21 is rotated in the pressed state to make the elastic portion enter or exit the limiting groove 12, and after the elastic portion enters the limiting groove 12, the button 2 is kept in the pressed state, that is, the button 2 is self-locking.

[0052] In this embodiment, the outer top surface of the housing 1 is provided with a plurality of protrusions 13 distributed at intervals, and the plurality of protrusions 13 cooperate with the top surface of the housing 1 to form a mounting groove 11. Specifically, as Figure 6As shown, there are two protrusions 13, which are arranged along the width direction of the housing 1, and one end of the two protrusions 13 used to surround the installation groove 11 faces different sides of the housing 1 in the length direction, and is suspended to form a limiting groove 12. The above-mentioned limiting groove 12 is provided at one end of the protrusion 13, and the part of the protrusion 13 corresponding to the inner side surface of the installation groove 11 is an arc surface, and the arc surfaces of the two protrusions 13 are arranged opposite to each other to make way for the rotation of the button 2.

[0053] In this embodiment, the elastic part includes a plurality of elastic rods 23, which are distributed along the circumference of the button body 21, and each elastic rod 23 is tilted. There are a plurality of limit grooves 12, and the plurality of limit grooves 12 correspond to the plurality of elastic rods 23 one by one. Specifically, there are two elastic rods 23, and the two elastic rods 23 are located on opposite sides of the button body 21, and the distance between the ends of the two elastic rods 23 connected to the button body 21 is smaller than the distance between the other ends of the two elastic rods 23 used to abut against the bottom surface of the mounting groove 11, that is, the two elastic rods 23 are roughly in an eight-shaped shape.

[0054] In this embodiment, the inner side surface of the installation groove 11 is also provided with a limiting protrusion 14 for limiting the elastic part from exiting the installation groove 11. The limiting protrusion 14 is preferably a convex bulge structure, so that the button 2 is easier to install into the installation groove 11. This is because when the button 2 is installed into the installation groove 11, the elastic rod 23 of the button 2 will be blocked by the bulge, but since the bulge is small in size and the contact area with the elastic rod 23 is very small, it is easier for the elastic rod 23 to pass over the bulge downward. Since the installation groove 11 is composed of the above-mentioned two protrusions 13 and the top surface of the shell 1, the limiting protrusion 14 is specifically located on the protrusion 13, and each protrusion 13 is respectively provided with a limiting protrusion 14, such as Figure 6 Therefore, after the button 2 and the housing 1 are assembled, each elastic rod 23 is stopped by the limiting protrusion 14, as shown in FIG. Fig.10 , Fig.11 As shown, the button 2 is not easily separated from the mounting groove 11.

[0055] The pusher 22 is an elastically deformable buffer rod, and is deformed when it abuts against the armature 41. Figure 7 As shown, the buffer rod includes an inclined section 221 for pushing the armature 41, and the buffer rod also includes a vertically extending connecting section 222, one end of the connecting section 222 is integrally formed with the button body 21, and the other end of the connecting section 222 is integrally formed with one end of the inclined section 221, and the angle between the two is greater than 90°.

[0056] The utility model also includes a top cover 3, which is connected to the top of the shell 1, and the top cover 3 covers each protrusion 13, making the entire appearance more concise and beautiful. The top cover 3 is provided with a limiting hole 31, and the limiting hole 31 is connected to the mounting groove 11. When the button 2 is installed, the head of the button body 21 passes through the limiting hole 31 upward. When the button 2 is pressed, the head of the button body 21 is limited above the limiting hole 31, which can prevent the button 2 from being damaged by excessive pressing. The elastic part (i.e., the two elastic rods 23) cannot pass through the limiting hole 31, so the button 2 can be further limited to prevent the button 2 from accidentally falling off. The side of the button body 21 also includes two straight faces set back to back; the limiting hole 31 and / or the mounting groove 11 are in the shape of a long strip. When the button 2 is assembled in the shell 1, the long side of the long strip cooperates with the two straight faces of the button body 21. Specifically, in this embodiment, the limiting hole 31 and / or the mounting groove 11 are both in the shape of a strip, but not limited thereto. In other embodiments, the limiting hole 31 or the mounting groove 11 is in the shape of a strip. In this way, on the one hand, the button 2 has a limiting effect during the operation of the button 2, and on the other hand, it has a foolproof effect when the button 2 is assembled. The middle of the two inner sides opposite to the limiting hole 31 are respectively provided with arc-shaped notches 311 for facilitating the rotation of the button body. The two arc-shaped notches 311 are arranged opposite to each other, and the two arc-shaped notches 311 cooperate with the two arc-shaped surfaces arranged back to back on the side of the button body 21 after the button body 21 is pressed and rotated. The arc-shaped surface and the straight surface are respectively arranged on the adjacent sides of the button body 21. A recessed portion 211 is provided between the two straight surfaces and the head of the button body, and the recessed portion 211 is used to clear the corners and make way for the button to rotate. A sinking groove 32 is provided on the top surface of the top cover 3, and the limiting hole 31 is arranged on the bottom surface of the sinking groove 32. When the button body 21 is pressed, its head is received in the sinking groove 32. The head of the button body 21 is in a long strip shape, but the shape is not limited thereto.

[0057] In this embodiment, the top cover 3 is provided with an observation window 33 for observing the position change of the second side 72, and the housing 1 is made of transparent material, so that the staff can conveniently observe the action of the push card 7 and the closing of the contacts.

[0058] The utility model provides an electromagnetic relay, whose initial state is as follows Figure 9-11 As shown, at this time, the two elastic rods 23 on the button body 21 are in a reset state and are distributed along the length direction of the shell 1. The top of the button body 21 is higher than the top surface of the top cover 3; the push portion 22 is located above the armature 41, and the armature 41 is in a released state. The moving contact 52 on the left side of the moving spring 51 is closed with the static contact 62 on the left side.

[0059] When the coil 45 is excited, the magnetic circuit portion 4 generates a magnetic field, and one side of the armature 41 is attracted by the top of the iron core 42 and swings. In this process, the other side of the armature 41 pushes the first side 71 of the push card 7 to swing away from the magnetic circuit portion 4, so that the second side 72 of the push card 7 drives the moving spring 51 to move rightward, so that the moving contact 52 on the right side closes with the static contact 62 on the static spring 61 on the right side. Fig.13 , Fig.16 When the coil 45 is de-energized, the magnetic field generated by the magnetic circuit part 4 disappears, the armature 41 swings in the opposite direction to reset under the action of the restoring spring 46, and releases the push card 7, and the moving spring 51 then moves to the left under its own elasticity, disconnecting the moving contact 52 on the right side from the static contact 62 on the right side, and closing the moving contact 52 on the left side with the static contact 62 on the left side, as shown in FIG. Fig.10 shown.

[0060] When the tester needs to check whether the load-end circuit of the relay is normally switched, the button 2 is pressed to move the push part 22 downward and contact the armature 41 until the armature 41 is pushed to swing to the position where it is attracted to the iron core 42 of the magnetic circuit part 4. Figure 12-14 During this process, the pusher 22 is deformed, which can buffer the pressure caused by the armature 41 resisting and squeezing, and can ensure the reliable contact between the armature 41 and the iron core 42 of the magnetic circuit part 4, thereby ensuring the accuracy of the test results. At this time, the top of the button body 21 is received in the sink 32 of the top cover 3, and the two elastic rods 23 are squeezed and deformed into a horizontal state, as shown in FIG. Fig.14 On this basis, the button 2 is rotated clockwise so that each elastic rod 23 enters the corresponding limit groove 12, so that the button 2 remains in the pressed state, as shown in FIG. Figure 15-18 After the test is completed, the button 2 is rotated in the opposite direction so that each elastic rod 23 rotates out of the limiting groove 12 respectively, and the entire button 2 is reset upward under the restoring force of the elastic rod 23.

[0061] The utility model provides an electromagnetic relay, wherein the push card 7 is roughly L-shaped, and the first side 71 of the push card 7 can be swingably stood between the magnetic circuit part 4 and the movable spring part 5, and the second side 72 is located above the two groups of contacts, so that the space occupied by the push card 7 between the magnetic circuit part 4 and the movable spring part 5 is greatly reduced, thereby making the overall internal structure more compact and the product is easy to realize miniaturized design.

[0062] The utility model is an electromagnetic relay, which does not need to additionally set up a compression spring and a locking component to provide the reset and locking of the button 2, which not only reduces the number of parts and reduces the material cost, but also enables the utility model to save the step of automatic loading of the compression spring when using automatic assembly, so as to facilitate the automatic assembly. In addition, since the button body 21 is rotatable, the button body 21 rotates in the pressed state to make the elastic part enter or exit the limit groove 12 on the side of the installation groove 11, and after the elastic part enters the limit groove 12, the button 2 is kept in the pressed state, that is, self-locking is achieved, so as to facilitate the tester to test. Therefore, the present invention does not need to set up a locking component separately, and does not need the housing to cooperate with the locking component, which is conducive to the housing to achieve a narrow design, that is, to achieve miniaturization. In addition, the utility model directly uses the elastic part and the limit groove 12 to limit the button 2 in the pressed state, and the structure is simpler and easier to process and form.

[0063] The above embodiments are only used to further illustrate an electromagnetic relay of the utility model, but the utility model is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model fall within the protection scope of the technical solution of the utility model.

Claims

1. An electromagnetic relay, comprising a base, a push card, and a magnetic circuit part and a contact part installed on the base, wherein the contact part comprises a moving spring part and a static spring part, and the moving spring part comprises a moving spring sheet and a moving contact point arranged on the moving spring sheet; characterized in that: The push card includes a first side and a second side fixed relative to the first side, the first side intersects with the second side or the extension line intersects with the second side, the first side is driven to swing by the armature of the magnetic circuit part, and the second side cooperates with the free end of the movable spring sheet so that when the push card is driven to swing by the armature, it drives the movable spring part and the static spring part to close or disconnect; the contact part is located in the space formed between the first side and the second side.

2. The electromagnetic relay according to claim 1, characterized in that: The first side of the push card is swingably connected to the base; the electromagnetic relay also includes a shell, which is connected to the base and contains the push card, the magnetic circuit part, and the contact part in its shell cavity, wherein the first side of the push card is located between the magnetic circuit part and the contact part.

3. The electromagnetic relay according to claim 2, characterized in that: The first side tail portion of the push card is forked into two legs distributed along its width direction and elastically deformable, and the tails of the two legs are respectively provided with a rotating shaft, and the two rotating shafts are respectively movably inserted into the corresponding shaft holes of the base, so that the push card uses the axes of the two rotating shafts as the swing axes.

4. The electromagnetic relay according to claim 1, characterized in that: The armature is L-shaped, one side of which is used for magnetic attraction, and the other side is located on the side of the first side of the pushing card facing away from the movable spring part, so as to push the first side of the pushing card to swing; the first side facing the armature is provided with two first baffles distributed along its width direction, and the other side of the armature is located between the two first baffles; the magnetic circuit part also includes a restoring spring sheet, which presses against the armature to limit the armature on the cutting edge of the yoke of the magnetic circuit part.

5. The electromagnetic relay according to claim 4, characterized in that: One side of the first side of the push card is provided with two second baffles distributed along the width direction thereof, the glue port of the push card is located between the two second baffles, and the protrusion of the glue port relative to the side where it is located is smaller than the protrusion of the second baffle relative to the side where it is located; the two second baffles and the two first baffles are located on the same side of the first side and are connected one by one, and the protrusion of the second baffle relative to the side where it is located is smaller than the protrusion of the first baffle relative to the side where it is located.

6. The electromagnetic relay according to claim 2, characterized in that: The second side of the push card is close to the inner top surface of the shell, and the first side and the second side of the push card are transitioned by a bevel; the two opposite inner side surfaces of the shell are provided with limiting ribs corresponding to the push card, and the push card is fitted between the limiting ribs on both sides of the shell, and the bottom of the limiting rib is inserted into the corresponding slot of the base.

7. The electromagnetic relay according to claim 2 or 6, characterized in that: The free end of the movable spring piece is passed through a clamping hole arranged on the second side of the push clamp; and a yielding groove is arranged on the inner top surface of the housing corresponding to the free end of the movable spring piece.

8. The electromagnetic relay according to claim 1, characterized in that: The static spring part includes two static spring pieces, which are respectively installed on the base, and each static spring piece is provided with a static contact; the dynamic spring piece is located between the two static spring pieces, and the number of dynamic contacts on the dynamic spring piece is two, the two dynamic contacts are arranged back to back, and correspond one by one to the static contacts of the two static spring pieces respectively.

9. The electromagnetic relay according to claim 2, characterized in that: It also includes a button, which includes a button body and a pushing part arranged together, the button body is movably mounted in the mounting groove provided in the shell, the pushing part passes through a through hole provided on the bottom surface of the mounting groove to enter the shell, and when the button body is pressed, it pushes the armature to move the armature to the attracted position; the button body is provided with an elastic part for resetting the button and protruding laterally, and the elastic part abuts against the bottom surface of the mounting groove; the button body is rotatable, and the inner side surface of the mounting groove is provided with a limiting groove on the rotation path of the button body, and the button body is rotated in the pressed state to make the elastic part enter or exit the limiting groove, and after the elastic part enters the limiting groove, the button is kept in the pressed state.

10. The electromagnetic relay according to claim 9, characterized in that: It also includes a top cover, which is connected to the top of the shell, and the top cover is provided with a limiting hole, which is connected to the installation slot. When the button is installed, the head of the button body passes through the limiting hole upward, and when the button is pressed, the head of the button body is limited above the limiting hole, and the elastic part cannot pass through the limiting hole; the top cover is provided with an observation window for observing the position change of the second side; the shell is made of transparent material.

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