Moving contact assembly

Abstract

The utility model discloses a moving contact assembly, including a moving contact, a push rod unit, and an electromagnetic unit. The push rod unit includes an insulating base, a bracket, and a push rod; the electromagnetic unit includes a static iron core coaxially arranged with the push rod, a second elastic member, and a moving iron core; a first elastic member is arranged between the lower surface of the moving contact and the upper surface of the insulating base; and a protrusion is convexly arranged on the lower surface of the insulating base facing the static iron core. The utility model increases the creepage distance and withstand voltage of the moving contact by arranging a protrusion on the lower side of the insulating base and a connecting boss extending into the static contact, thereby increasing the withstand voltage value of the contactor and improving the safety of the contactor. In addition, the utility model increases the voltage level without changing the volume of the contactor by adding a protrusion on the insulating base, and reduces the volume of the contactor at the same voltage level, which meets the development trend of product miniaturization.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to a moving contact assembly. Background Art

[0002] In the prior art, a contactor (or relay) generally includes a main contact system and an electromagnetic system that drives the main contact system. The main contact system mainly includes a moving contact and a stationary contact. The electromagnetic system mainly includes a metal push rod and an electromagnetic coil suitable for driving the metal push rod to move. The metal push rod is used to push the moving contact so that the moving contact and the stationary contact are electrically contacted.

[0003] In the prior art, without considering the insulation between the metal push rod and the moving contact, the metal push rod can be directly matched with the moving contact. However, when the metal push rod and the moving contact are required to be insulated from each other, the safety standard requires that the coil circuit and the contact circuit meet certain insulation distance requirements. However, in the prior art, the creepage distance between the metal push rod and the moving contact is short, the creepage capacity and withstand voltage capacity are low, and the safety is insufficient. If a higher creepage distance is to be achieved, it can only be achieved by increasing the product volume, which is obviously not in line with the development trend of product miniaturization. Summary of the invention

[0004] In order to overcome the above defects, the utility model provides a moving contact assembly to solve the problem of poor voltage resistance of the contactor.

[0005] The technical solution adopted by the utility model to solve the technical problem is: to provide a moving contact assembly, including:

[0006] Moving contact;

[0007] A push rod unit, comprising an insulating base, a bracket and a push rod, wherein the bracket is arranged on the insulating base, and the push rod is arranged along its axial direction and one end of the push rod is connected to the insulating base;

[0008] The electromagnetic unit is arranged below the insulating base, and comprises a static iron core coaxially arranged with the push rod, a second elastic member and a moving iron core;

[0009] In which, the moving contact is arranged on the bracket, and a first elastic member is provided between the lower surface of the moving contact and the upper surface of the insulating base; the other end of the push rod passes through the static iron core and the elastic member in sequence and is fixedly connected to the moving iron core; the insulating base is provided with a protruding portion on the lower surface facing the static iron core.

[0010] As a further improvement of the utility model, the protrusion includes two annular bosses coaxially arranged with the push rod, and the two annular bosses are spaced apart radially outwardly along the push rod.

[0011] As a further improvement of the present invention, the heights of the two annular bosses increase sequentially along the radial direction of the push rod.

[0012] As a further improvement of the utility model, the raised portion further includes two long bosses arranged opposite to and in parallel, and the two long bosses are respectively arranged close to two ends of the insulating base in the length direction.

[0013] As a further improvement of the utility model, the height dimension of the long boss is lower than the height dimension of the annular boss close to one side of the push rod.

[0014] As a further improvement of the utility model, the lower surface of the insulating base is provided with a connecting boss covering one end of the push rod, and the static iron core is provided with a receiving groove coaxially arranged with the connecting boss, and the connecting boss is placed in the receiving groove.

[0015] As a further improvement of the present invention, a gap is formed between the outer wall surface of the connecting boss and the inner wall surface of the accommodating groove.

[0016] As a further improvement of the present invention, the second elastic member is a return spring, and two ends of the second elastic member are respectively against the static iron core and the movable iron core.

[0017] As a further improvement of the present invention, spring support grooves are respectively provided on the relatively close sides of the static iron core and the movable iron core, and the two ends of the second elastic member are respectively placed in the two spring support grooves.

[0018] The beneficial effect of the utility model is that by arranging the protrusion on the lower side of the insulating base and the connecting boss extending into the static contact, the creepage distance and the withstand voltage of the moving contact are increased, thereby increasing the withstand voltage value of the contactor and improving the safety of the contactor. In addition, by adding the protrusion on the insulating base, the utility model increases the voltage level without changing the volume of the contactor, and reduces the volume of the contactor at the same voltage level, which conforms to the development trend of product miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the utility model without an elastic member;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0021] Figure 3 The utility model is a schematic diagram of a cross-sectional structure of a contactor.

[0022] Combined with the attached drawings, the following description is given:

[0023] 1. Moving contact; 2. Push rod unit; 21. Insulating base; 211. Annular boss; 212. Long boss; 213. Connecting boss; 22. Bracket; 23. Push rod; 24. First elastic member; 3. Electromagnetic unit; 31. Static iron core; 311. Accommodating groove; 312. Gap; 32. Second elastic member; 33. Moving iron core; 34. Spring supporting groove; 35. Electromagnetic coil; 36. Metal cover; 4. Shell; 5. Yoke iron plate; 6. Ceramic cover; 61. First cavity; 7. U-shaped yoke; 71. Second cavity; 8. Static contact. DETAILED DESCRIPTION

[0024] A preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.

[0025] See also Figure 1 and 2 The utility model provides a moving contact assembly, which is applied to a contactor. The moving contact assembly includes a moving contact 1, a push rod unit 2 and an electromagnetic unit 3.

[0026] Specifically, the push rod unit 2 includes an insulating base 21, a bracket 22 and a push rod 23. The bracket 22 is arranged on the insulating base 21. The push rod 23 is arranged along its axial direction and one end is connected to the insulating base 21. The electromagnetic unit 3 is arranged below the insulating base 21, and includes a static iron core 31, a second elastic member 32 and a moving iron core 33 coaxially arranged with the push rod 23. Among them, the moving contact 1 is arranged on the bracket 22, and a first elastic member 24 is arranged between the lower surface of the moving contact 1 and the upper surface of the insulating base 21. The first elastic member 24 is a spring; the other end of the push rod 23 passes through the static iron core 31 and the elastic member 32 in sequence and is fixedly connected to the moving iron core 33; the insulating base 21 is provided with a protruding portion on the lower surface facing the static iron core 31.

[0027] Further, the protrusion includes two annular bosses 211 coaxially arranged with the push rod 23, two long bosses 212 arranged oppositely and in parallel, and a connecting boss 213. The two annular bosses 211 are arranged radially outwardly of the push rod 23 at intervals. The heights of the two annular bosses 211 increase radially outwardly of the push rod 23. The two long bosses 212 are respectively arranged near the two ends of the length direction of the insulating base 21, and the height of the long bosses 212 is lower than the height of the annular boss 211 near one side of the push rod 23.

[0028] Furthermore, the lower surface of the insulating base 21 is provided with a connecting boss 213 covering one end of the push rod 23, and the static iron core 31 is provided with a receiving groove 311 coaxially arranged with the connecting boss 213, and the connecting boss 213 is placed in the receiving groove 311. A gap 312 is formed between the outer wall surface of the connecting boss 213 and the inner wall surface of the receiving groove 311.

[0029] Furthermore, the second elastic member 32 is a return spring, and its two ends respectively abut against the static iron core 31 and the movable iron core 33. Spring support grooves 34 are respectively provided on the relatively close sides of the static iron core 31 and the movable iron core 33, and the two ends of the second elastic member 32 are respectively placed in the two spring support grooves 34.

[0030] Specifically, by providing a protrusion on the lower side of the insulating base and a connecting boss extending into the static contact, the creepage distance and voltage resistance of the moving contact are increased, thereby increasing the voltage resistance value of the contactor and improving the safety of the contactor. In addition, by adding a protrusion on the insulating base, the utility model increases the voltage level without changing the volume of the contactor.

[0031] See also Figure 3 , a cross-sectional view of an embodiment of a contactor using the movable contact assembly of the utility model is provided. The bold line portion on the lower side of the insulating base 21 is the creepage distance path.

[0032] Specifically, the contactor includes a housing 4, a yoke plate 5 is provided in the housing 4, a ceramic cover 6 is provided on the upper side of the yoke plate 5, a sealed first cavity 61 is formed between the ceramic cover 6 and the yoke plate 5, a U-shaped yoke 7 is connected to the lower side of the yoke plate 5, and a second cavity 71 is formed between the U-shaped yoke 7 and the yoke plate 5. Two static contacts 8 are provided on the top of the ceramic cover 6 for connecting to external electrical equipment, the lower ends of the two static contacts 8 extend into the first cavity 61, the moving contact 1 is mounted on the bracket 22 and is directly below the two static contacts 8, and the push rod 23 drives the moving contact 1 to contact or separate with the lower end contacts of the two static contacts 8 when it moves.

[0033] The electromagnetic unit 3 is arranged in the second cavity 71, and is arranged on the side of the yoke plate 5 away from the ceramic cover 6 through the U-shaped yoke 7. It includes an electromagnetic coil 35 with a hollow cylindrical structure and arranged in the groove of the U-shaped yoke 7, and a metal cover 36 that is inserted into the tube of the electromagnetic coil 35 and connected to the yoke plate 5 at the upper end. The static iron core 31 is fixedly connected to the metal cover 36 and the upper part passes through the yoke plate 5 and is fixedly connected to the yoke plate 5. The static iron core 31, the second elastic member 32 and the moving iron core 33 are placed in the metal cover 36; one end of the push rod 23 is fixedly connected to the insulating base 21, and the other end passes through the static iron core 31 and the second elastic member 32 in sequence and is fixedly connected to the moving iron core 33.

[0034] When the electromagnetic coil 35 is energized, it generates a magnetic field that drives the moving iron core 33 to move along its axial direction toward one side of the static iron core 31, driving the push rod 23 to move so that the moving contact 1 contacts the lower end contact of the static contact 8, thereby realizing the power-on action of the contactor; when the electromagnetic coil 35 is de-energized, the magnetic field disappears, and the moving iron core 33 is reset under the action of the second elastic member 32, so that the moving contact 1 is separated from the lower end contact of the static contact 8, thereby realizing the power-off action of the contactor.

[0035] By using the moving contact assembly provided by the utility model, the creepage distance and the withstand voltage capacity of the moving contact are lengthened without increasing the volume of the contactor. Figure 3 The marked serrated "creeping path" increases the withstand voltage of the contactor and improves the safety of the contactor. In addition, the contactor using the above-mentioned moving contact assembly is smaller than the conventional contactor at the same voltage level, which conforms to the development trend of product miniaturization.

[0036] In summary, the movable contact assembly provided by the utility model increases the creepage distance and withstand voltage of the movable contact by providing a protrusion on the lower side of the insulating base and a connecting boss extending into the static contact, thereby increasing the withstand voltage value of the contactor and improving the safety of the contactor. In addition, the utility model increases the voltage level without changing the volume of the contactor by adding a protrusion on the insulating base, and reduces the volume of the contactor at the same voltage level, which is in line with the development trend of product miniaturization.

[0037] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A moving contact assembly, characterized in that: include: Moving contact (1); A push rod unit (2), comprising an insulating base (21), a bracket (22) and a push rod (23), wherein the bracket (22) is arranged on the insulating base (21), and the push rod (23) is arranged along its axial direction and one end of the push rod is connected to the insulating base (21); The electromagnetic unit (3) is arranged below the insulating base (21), and comprises a static iron core (31) coaxially arranged with the push rod (23), a second elastic member (32) and a moving iron core (33); The moving contact (1) is arranged on the bracket (22), and a first elastic member (24) is provided between the lower surface of the moving contact (1) and the upper surface of the insulating base (21); the other end of the push rod (23) passes through the static iron core (31) and the elastic member (32) in sequence and is fixedly connected to the moving iron core (33); the insulating base (21) is provided with a protruding portion on the lower surface facing the static iron core (31).

2. The moving contact assembly according to claim 1, characterized in that: The raised portion comprises two annular bosses (211) coaxially arranged with the push rod (23), and the two annular bosses (211) are spaced apart radially outwardly of the push rod (23).

3. The moving contact assembly according to claim 2, characterized in that: The height dimensions of the two annular bosses (211) increase sequentially along the radial direction of the push rod (23) outwards.

4. The moving contact assembly according to claim 3, characterized in that: The raised portion further comprises two long bosses (212) arranged opposite to each other and in parallel, and the two long bosses (212) are respectively arranged close to two ends of the insulating base (21) in the length direction.

5. The moving contact assembly according to claim 4, characterized in that: The height dimension of the long boss (212) is lower than the height dimension of the annular boss (211) on the side close to the push rod (23).

6. The moving contact assembly according to claim 1, characterized in that: The lower surface of the insulating base (21) is provided with a connecting boss (213) covering one end of the push rod (23); the static iron core (31) is provided with a receiving groove (311) coaxially arranged with the connecting boss (213); and the connecting boss (213) is placed in the receiving groove (311).

7. The moving contact assembly according to claim 6, characterized in that: A gap (312) is formed between the outer wall surface of the connecting boss (213) and the inner wall surface of the accommodating groove (311).

8. The moving contact assembly according to claim 1, characterized in that: The second elastic member (32) is a return spring, and two ends of the second elastic member are respectively against the static iron core (31) and the movable iron core (33).

9. The moving contact assembly according to claim 8, characterized in that: A spring support groove (34) is provided on one side of the static iron core (31) and the movable iron core (33) that is relatively close to each other, and two ends of the second elastic member (32) are respectively placed in the two spring support grooves (34).

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