Relay

Abstract

The relay comprises a magnetic pole plate, a cover body fixedly covering the magnetic pole plate and an upper armature assembly accommodated between the magnetic pole plate and the cover body, the upper armature assembly comprises an armature support, an insulating block and an upper armature fixedly arranged on the armature support, and the insulating block is fixedly arranged at the bottom of the armature support. The armature support is supported on the magnetic pole plate through the insulating block and is limited by a positioning structure arranged between the insulating block and the magnetic pole plate so as to limit the upper armature assembly to move in the direction of the plane where the magnetic pole plate is located. An elastic body made of soft rubber materials is arranged between the cover body and the armature support, and the cover body is used for pressing the armature support through the elastic body. According to the utility model, the risks of air leakage and armature support deformation caused by riveting with the magnetic pole plate can be effectively avoided, the distance between the upper armature and the lower armature can be accurately controlled, the anti-short-circuit performance of the product is ensured, the risk of high-voltage breakdown is avoided, the fixing mode is simple, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of electric control devices, and particularly relates to a relay. Background Art

[0002] The DC relay mainly controls the connection and disconnection of the circuit in the tram. With the rapid development of the tram industry, higher and higher requirements are put forward for the working conditions of the DC relay. When the DC relay encounters abnormal working conditions during operation and a large current passes between the contacts (such as a short circuit occurs), there is a large electro-dynamic repulsive force between the contacts. When the electro-dynamic repulsive force is greater than the sum of the supporting force provided by the spring and the electromagnetic suction force, the contact will be repelled, resulting in the imbalance of the dynamic stability of the contact, and even causing contact welding or strong electric arcs to cause an explosion. Therefore, in the design process of the DC relay, the design of the anti-short-circuit structure is crucial.

[0003] At present, the design of the anti-short-circuit structure usually adopts two armatures, namely the upper armature and the lower armature. The lower armature is fixed in the moving component structure, and the upper armature is distributed directly above the lower armature. When an electric current passes between the contacts, the generated circular magnetic field magnetizes the upper armature and the lower armature, causing a magnetic suction force between the upper armature and the lower armature. Since the upper armature is fixed, the lower armature will be attracted by the upper armature, so that an upward compensation force can be provided to the moving contact piece, increasing the contact pressure and thus preventing the moving contact piece from being repelled.

[0004] At the present stage, the fixing methods of the upper armature generally fall into two categories. One is to inject the upper armature and the metal bracket into the plastic and rivet the metal bracket to the pole plate. This fixing method is prone to the risk of air leakage of the pole plate using the riveting process, and the metal bracket is prone to deformation. The other is to directly weld the upper armature in the ceramic cover. Its assembly difficulty is large, the risk of falling off is high, and it is difficult to control the distance between the upper armature and the lower armature. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Content of the Utility Model

[0005] The problem to be solved by the utility model is to provide a relay to overcome the defects that the fixing method of the upper armature of the existing relay is prone to air leakage of the pole plate and has a large assembly difficulty.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a relay, comprising: a pole plate, a cover body fixedly arranged on the pole plate, and an upper armature assembly accommodated between the pole plate and the cover body. The upper armature assembly includes an armature bracket and an upper armature fixedly arranged on the armature bracket. The armature bracket is fixedly arranged on the pole plate. An elastic body made of a soft rubber material is arranged between the cover body and the armature bracket, and the cover body presses the armature bracket through the elastic body.

[0007] As a further improvement of the present utility model, an installation platform is provided at the top of the armature bracket, and the elastic body is installed on the installation platform.

[0008] As a further improvement of the present utility model, the elastic body is provided with a pressing part and a clamping part integrally arranged at the bottom of the pressing part. An installation hole is provided on the installation platform, and the clamping part is clamped in the installation hole, and the pressing part is located above the installation platform.

[0009] As a further improvement of the present utility model, the pressing part is spherical or cylindrical, its size is larger than that of the clamping part, and the thickness of the pressing part in the natural state is greater than the distance between the armature bracket and the cover body. Therefore, the pressing part in the assembled state can be in interference fit with the cover body to generate deformation to press the armature bracket.

[0010] As a further improvement of the present utility model, the armature bracket is formed by bending a metal sheet metal part. It is provided with two support side plates and a mounting plate connected to the upper ends of the two support side plates. The upper armature is fixed to the bottom of the mounting plate; the relay further includes an insulating block fixed to the bottom of the armature bracket. The armature bracket is supported on the magnetic pole plate through the insulating block and is limited by a positioning structure provided between the insulating block and the magnetic pole plate to limit the movement of the upper armature assembly along the plane where the magnetic pole plate is located; wherein, insulating blocks are fixed to the bottoms of the two support side plates.

[0011] As a further improvement of the present utility model, the installation platform is integrally extended horizontally outward from the installation plate.

[0012] As a further improvement of the present utility model, a punching in a "C" shape is punched at the bending position of the metal sheet metal part. When the metal sheet metal part is bent along the bending position, the part surrounded by the punching does not perform a bending action, thus forming the installation platform.

[0013] As a further improvement of the present utility model, the installation hole is arranged at the bending position of the metal sheet metal part.

[0014] As a further improvement of the present utility model, the positioning structure includes a first positioning part arranged at the bottom of the insulating block and a second positioning part arranged at the top of the magnetic pole plate. One of the first positioning part and the second positioning part presents a groove shape, and the other presents a convex shape matching it. The first positioning part and the second positioning part are inserted and matched.

[0015] As a further improvement of the present utility model, the insulating block is made of plastic material and is integrally injection molded on the armature bracket.

[0016] The beneficial effects of the present utility model are as follows: The present utility model provides a relay. The armature bracket is supported on the magnetic pole plate through an insulating block and is preliminarily limited by a positioning structure. Then, the cover body directly presses the armature bracket through an elastic body to realize the installation and fixation of the upper armature. This method does not require brazing and riveting processes, avoids the risks of air leakage and deformation of the armature bracket caused by riveting with the magnetic pole plate, can accurately control the distance between the upper armature and the lower armature, ensure the short-circuit resistance performance of the product, and at the same time can avoid the risk of high-voltage breakdown under the action of the insulating block. Moreover, this fixing method is simple, has a low manufacturing cost, and can also improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of the relay of the present utility model;

[0018] Figure 2 is a cross-sectional view of the relay of the present utility model;

[0019] Figure 3 is a perspective view of the assembly of the upper armature assembly, push rod assembly and magnetic pole plate of the relay of the present utility model;

[0020] Figure 4 is a cross-sectional view of the assembly of the upper armature assembly and magnetic pole plate of the relay of the present utility model;

[0021] Figure 5 is a perspective view of the upper armature assembly of the relay of the present utility model;

[0022] Figure 6 is a perspective view of a partial view of the elastic body and armature bracket of the relay of the present utility model.

[0023] The following descriptions are made in conjunction with the accompanying drawings:

[0024] 1. Magnetic pole plate; 101. Second positioning part; 2. Cover body; 3. Armature bracket;

[0025] 31. Installation platform; 311. Installation hole; 32. Support side plate; 33. Installation plate;

[0026] 34. Punching; 4. Insulating block; 41. First positioning part; 5. Upper armature; 6. Elastic body; 61. Pressing part; 62. Clamping part; 7. Static contact; 8. Moving contact piece; 9. Connecting ring; 10. Lower armature; 11. Push rod assembly; 12. Moving iron core; 13. Static iron core. SPECIFIC EMBODIMENTS

[0027] The following is a detailed description of the preferred embodiments of the present utility model in conjunction with the accompanying drawings.

[0028] Refer to Figure 1 and Figure 2, the present utility model provides a relay, which includes a magnetic pole plate 1, a cover body 2, a static contact 7, a moving contact piece 8, a lower armature 10, a push rod assembly 11, an upper armature assembly and an electromagnetic driving mechanism.

[0029] In this embodiment, the cover body 2 is a rectangular structure with a top but no bottom and a cavity inside, and its material is preferably ceramic with insulation properties. The magnetic pole plate 1 is rectangular and has a size larger than that of the cover body 2, and the cover body 2 is fixedly sleeved on the magnetic pole plate 1. Among them, the cover body 2 and the magnetic pole plate 1 can be hermetically fixed by a connecting ring 9 in a welding manner.

[0030] Furthermore, there are two static contacts 7, which are fixedly arranged side by side on the top of the cover body 2, and the lower ends of both static contacts 7 extend into the interior of the cover body 2. The push rod assembly 11 is movably arranged in the cover body 2, and the lower end of the push rod of the push rod assembly 11 passes downward through the magnetic pole plate 1 and is connected to the electromagnetic driving mechanism below the magnetic pole plate 1. Among them, the push rod assembly 11 is not the part to be improved in this application, and it adopts the existing conventional technology. The specific structure is as shown in the figure and will not be elaborated herein. The moving contact piece 8 is located in the cover body 2 and is installed on the push rod assembly 11; the two static contacts 7 and the moving contact piece 8 are distributed vertically opposite to each other.

[0031] Among them, the electromagnetic driving mechanism includes a static iron core 13 fixed at the bottom of the magnetic pole plate 1, a moving iron core 12 arranged directly below the static iron core 13 and fixedly connected to the lower end of the push rod, and a coil winding (not shown in the figure) distributed around the outer sides of the moving iron core 12 and the static iron core 13.

[0032] In addition, a sleeve is sleeved outside the moving iron core 12 and the static iron core 13, and the sleeve is hermetically connected to the magnetic pole plate 1 to ensure the sealing of the cavity formed between the magnetic pole plate 1 and the cover body 2.

[0033] When the coil winding is energized, the moving iron core 12 and the static iron core 13 are magnetized. The moving iron core 12 is attracted upward and attracted to the bottom of the static iron core 13. At the same time, the moving iron core 12 will push the push rod assembly 11 to drive the moving contact piece 8 to move upward to connect with the two static contacts 7.

[0034] Refer to Figure 2 and Figure 3 , the lower armature 10 is U-shaped, and is also installed on the push rod assembly 11 and upwardly sleeved on the bottom of the moving contact piece 8, and the two side plates of the lower armature 10 protrude upward along both sides of the moving contact piece 8. The upper armature assembly is accommodated between the magnetic pole plate 1 and the cover body 2, and includes an upper armature 5 located directly above the lower armature 10 and fixed. There is a gap between the upper armature 5 and the lower armature 10 and they do not contact each other. When the moving contact piece 8 is connected to the two static contacts 7, the current flows through the moving contact piece 8 to generate a magnetic field to magnetize the upper armature 5 and the lower armature 10, so that a suction force is generated between the upper armature 5 and the lower armature 10 to provide an upward compensation force for the moving contact piece 8, thereby improving the short-circuit resistance.

[0035] As an important improvement of the present invention, as Figure 2 shown, the upper armature assembly further includes an armature bracket 3, an insulating block 4, and an elastomer 6 made of a soft rubber material. The upper armature 5 is fixedly arranged on the armature bracket 3, and the fixing methods include but are not limited to riveting. The insulating block 4 is fixedly arranged at the bottom of the armature bracket 3. The armature bracket 3 is supported on the magnetic pole plate 1 through the insulating block 4 and is limited by a positioning structure arranged between the insulating block 4 and the magnetic pole plate 1 to restrict the movement of the upper armature assembly along the plane of the magnetic pole plate 1. The elastomer 6 is arranged between the cover body 2 and the armature bracket 3. The cover body 2 presses the armature bracket 3 through the elastomer 6, thereby realizing the all-round limitation of the upper armature assembly, that is, realizing the installation and fixation of the upper armature 5.

[0036] The utility model adopts the above fixing method, supports the armature bracket 3 on the magnetic pole plate 1 through the insulating block 4 and performs preliminary limitation by the positioning structure, and then directly presses the armature bracket 3 by the cover body 2 through the elastomer 6 to realize the installation and fixation of the upper armature 5. This method does not require brazing and riveting processes, avoids the risk of air leakage caused by riveting with the magnetic pole plate 1, can accurately control the distance between the upper armature 5 and the lower armature 10, ensure the anti-short-circuit performance of the product, and at the same time can avoid the risk of high-voltage breakdown under the action of the insulating block 4. Moreover, this fixing method is simple, has low manufacturing cost, and can also improve production efficiency.

[0037] As Figure 5 shown, the armature bracket 3 in the utility model can be formed by stamping and bending a metal sheet metal part and is in an inverted U shape. The armature bracket 3 is provided with two support side plates 32 and a mounting plate 33 connected to the upper ends of the two support side plates 32. The upper armature 5 is fixed to the bottom of the mounting plate 33, and insulating blocks 4 are fixedly arranged at the bottoms of the two support side plates 32.

[0038] As Figure 2 and Figure 3 shown, the armature bracket 3 is supported on the magnetic pole plate 1 through the two insulating blocks 4 at the bottom and is erected outside the moving contact piece 8 and the push rod assembly 11. At the same time, the mounting plate 33 of the armature bracket 3 and the upper armature 5 thereon are located between the two static contacts 7.

[0039] Preferably, the insulating block 4 is made of plastic material, which is integrally injection-molded at the bottom of the support side plate 32, and there is a certain distance between the bottom of the injection-molded support side plate 32 and the bottom of the insulating block 4 to ensure the insulation performance.

[0040] Further, the positioning structure includes a first positioning portion 41 provided at the bottom of the insulating block 4 and a second positioning portion 101 provided at the top of the magnetic pole plate 1. One of the first positioning portion 41 and the second positioning portion 101 is in the form of a groove, and the other is in the form of a convex hull that matches it. The first positioning portion 41 and the second positioning portion 101 are inserted and matched to restrict the movement of the upper armature assembly in the direction of the plane where the magnetic pole plate 1 is located. This positioning structure is easy to process and form, and the assembly is very convenient.

[0041] As Figure 4 shown, in this embodiment, the first positioning portion 41 provided at the bottom of the insulating block 4 is specifically but not limited to two circular grooves, and the second positioning portion 101 provided at the top of the magnetic pole plate 1 is specifically but not limited to four circular convex hulls. The circular convex hulls and the circular grooves are inserted and matched one by one to achieve positioning.

[0042] Refer to Figure 5 and Figure 6 , the top of the armature bracket 3 is provided with a mounting platform 31, and the elastic body 6 is mounted on the mounting platform 31.

[0043] Preferably, the armature bracket 3 is provided with mounting platforms 31 at both ends of the mounting plate 33, and at least one elastic body 6 is mounted on each mounting platform 31 to ensure the reliability and stability of the pressing of the cover 2 on the armature bracket 3. At the same time, this structure can also reasonably utilize the internal space of the cover 2 to accommodate the elastic body 6.

[0044] In this embodiment, the forming method of the mounting platform 31 is as follows: two punching holes 34 with opposite "C" shapes are punched at two bending positions of the metal sheet metal part. When the metal sheet metal part is bent along the bending position, the part surrounded by the punching holes 34 does not perform the bending action to form the mounting platform 31.

[0045] Of course, in other embodiments of the present invention, the mounting platform 31 may also be integrally extended horizontally outward from the mounting plate 33 at a suitable position.

[0046] Further, the elastic body 6 is provided with a pressing portion 61 and a plugging portion 62 integrally provided at the bottom of the pressing portion 61. The plugging portion 62 is provided with an annular slot, and the mounting platform 31 is provided with a mounting hole 311. The plugging portion 62 is clamped in the mounting hole 311 through the annular slot, and the pressing portion 61 is located above the mounting platform 31.

[0047] Among them, the pressing part 61 can be spherical, cylindrical or the like, preferably spherical, which is beneficial to deformation when in interference fit with the cover 2. The size of the pressing part 61 is larger than that of the clamping part 62 to prevent it from being disengaged from the mounting hole 311 when being pressed. The thickness of the pressing part 61 in the natural state is larger than the distance between the armature bracket 3 and the cover 2, so that the pressing part 61 in the assembled state can be in interference fit with the cover 2 to generate deformation to press the armature bracket 3.

[0048] Optionally, the elastic body 6 is made of rubber, silica gel, polyurethane or the like. In view of the non-exhaustiveness of soft rubber materials, as long as it can meet the required functions, it can be equivalently replaced with several materials exemplified in this article.

[0049] It is worth mentioning that the mounting hole 311 is arranged at the bending position of the metal sheet metal part. When the elastic body 6 is pressed by the cover 2, the main body of the armature bracket 3 can share the pressure for the mounting platform 31 to prevent only the mounting platform 31 from deforming and the force being too concentrated.

[0050] It can be seen that the relay of the present utility model adopts the method of supporting the armature bracket 3 on the pole plate 1 through the insulating block 4 and preliminarily limiting the position by the positioning structure, and then directly pressing the armature bracket 3 by the cover 2 through the elastic body 6 to realize the installation and fixation of the upper armature 5. This method does not require brazing and riveting processes, avoids the risks of air leakage and deformation of the armature bracket 3 caused by riveting with the pole plate 1, can accurately control the distance between the upper armature 5 and the lower armature 10, ensure the short-circuit resistance performance of the product, and at the same time can avoid the risk of high-voltage breakdown under the action of the insulating block 4. Moreover, this fixing method is simple, has low manufacturing cost, and can also improve production efficiency.

[0051] In the above description, many specific details are elaborated to fully understand the present utility model. However, the above description is only a preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes. All contents that do not depart from the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the protection of the technical solution of the present utility model.

Claims

1. A relay, comprising a magnetic pole plate (1), a cover body (2) fixedly covered on the magnetic pole plate (1), and an upper armature assembly accommodated between the magnetic pole plate (1) and the cover body (2), the upper armature assembly including an armature bracket (3) and an upper armature (5) fixedly arranged on the armature bracket (3), characterized in that: The armature bracket (3) is fixedly arranged on the pole plate (1). An elastic body (6) made of a soft rubber material is arranged between the cover body (2) and the armature bracket (3). The cover body (2) presses the armature bracket (3) through the elastic body (6).

2. The relay according to claim 1, wherein: The top of the armature bracket (3) is provided with a mounting platform (31), and the elastic body (6) is mounted on the mounting platform (31).

3. The relay according to claim 2, wherein: The elastic body (6) is provided with a pressing part (61) and a clamping part (62) integrally arranged at the bottom of the pressing part (61). A mounting hole (311) is provided on the mounting platform (31). The clamping part (62) is clamped in the mounting hole (311), and the pressing part (61) is located above the mounting platform (31).

4. The relay according to claim 3, characterized in that: The pressing part (61) is spherical or cylindrical, and its size is larger than that of the clamping part (62). The thickness of the pressing part (61) in the natural state is larger than the distance between the armature bracket (3) and the cover body (2). Therefore, the pressing part (61) in the assembled state can be in interference fit with the cover body (2) to deform and press the armature bracket (3).

5. The relay according to claim 3, characterized in that: The armature bracket (3) is bent from a metal sheet metal part. It is provided with two support side plates (32) and a mounting plate (33) connected to the upper ends of the two support side plates (32). The upper armature (5) is fixed to the bottom of the mounting plate (33). The relay further includes an insulating block (4) fixedly arranged at the bottom of the armature bracket (3). The armature bracket (3) is supported on the pole plate (1) through the insulating block (4) and is limited by a positioning structure arranged between the insulating block (4) and the pole plate (1) to limit the movement of the upper armature assembly along the plane where the pole plate (1) is located. Among them, the insulating blocks (4) are fixed to the bottoms of the two support side plates (32).

6. The relay according to claim 5, characterized in that: The mounting platform (31) is integrally extended horizontally outward from the mounting plate (33).

7. The relay according to claim 5, wherein: The metal sheet metal part is punched with a "C"-shaped punching hole (34) at the bending position. When the metal sheet metal part is bent along the bending position, the part surrounded by the punching hole (34) does not perform a bending action, thereby forming the mounting platform (31).

8. The relay according to claim 7, wherein: The mounting hole (311) is arranged at the bending position of the metal sheet metal part.

9. The relay according to claim 5, characterized in that: The positioning structure includes a first positioning part (41) arranged at the bottom of the insulating block (4) and a second positioning part (101) arranged at the top of the pole plate (1). One of the first positioning part (41) and the second positioning part (101) is in the form of a groove, and the other is in the form of a convex hull matching it. The first positioning part (41) and the second positioning part (101) are inserted and matched with each other.

10. The relay according to claim 5, characterized in that: The insulating block (4) is made of plastic material and is integrally injection-molded on the armature bracket (3).

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