A contact system structure for a direct current contactor

Abstract

The utility model discloses a contact system structure for direct current contactor, this contact system structure for direct current contactor includes coil assembly, and the guide plate of cover combination coil assembly one end, the baffle, be equipped with coil pressing plate between coil assembly and guide plate for preventing coil assembly and guide plate from happening axial line deviation, guide sleeve department is equipped with in guide plate, the top rod of liftable is equipped with in guide sleeve department, top rod is equipped with contact support seat, both sides of guide plate are equipped with limit department, and the recessed cavity of accommodating baffle is equipped with in limit department. Through baffle cooperation recessed cavity, and supplement with coil pressing plate makes the axial center of guide plate and coil assembly be in same axial line, ensure that the axial line does not happen deviation in the process of lifting of top rod, through limit department and interval prevent contact support seat from happening left and right rotation in the process of lifting, ensure that moving contact and static contact are in same axial line, make product have the advantage that improve service life.

Description

Technical Field

[0001] This utility model relates to the field of DC contactor technology, and in particular to a contact system structure for a DC contactor. Background Technology

[0002] In recent years, DC power systems have seen rapid application and development in fields such as rail transportation, ship power supply, and new energy power generation due to their unique advantages. DC circuit breakers, which have the function of interrupting system fault currents, have received increasing attention as important protection and control equipment in DC power systems.

[0003] To reduce the breaking voltage at each break point, existing DC contactor contact systems use a double-moving contact structure with four break points. This double-moving contact structure includes two groups of moving contacts, each with contacts at both ends. During the closing or opening of the contacts, the four contacts on the two groups of moving contacts need to separate simultaneously to reduce the breaking voltage at each break point.

[0004] However, in the existing double-moving contact structure of DC circuit breakers, when the moving contact group moves up and down under the combined action of the thrust of the contact support seat and the elastic force of the moving contact compression spring, the balance of the moving contact group is not high and the axis of the moving contact is offset. This easily leads to the problem of left and right rotation during the lifting and lowering process, causing the center line of the moving contact to deviate from that of the stationary contact. The thinner silver layer of the contact contacts comes into contact with the thicker silver layer first, accelerating the consumption rate of the silver layer of the contact and reducing the service life of the DC contactor. Therefore, the applicant has made a beneficial design and found a way to solve the above problems. The technical solution to be introduced below is generated in this context. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the contact system design of traditional DC contactors and to provide a product with improved service life.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A contact system structure for a DC contactor includes a coil assembly, a guide plate and a stop block covering one end of the coil assembly, a coil pressure plate between the coil assembly and the guide plate to prevent the coil assembly from shifting off-center from the guide plate, a guide sleeve with a liftable push rod and a contact support seat, limiting portions on both sides of the guide plate, each limiting portion having a cavity for accommodating the stop block, the cavity abutting against the side wall of the stop block, and a gap between the limiting portions and the contact support seat for raising and lowering the contact support seat.

[0008] Preferably, an armature is fixedly provided on the outer wall of the guide sleeve, and the armature is provided with a limiting groove.

[0009] Preferably, the coil assembly has a first contact portion, and the guide plate has a second contact portion that abuts against the first contact portion, so that a space for accommodating the coil pressure plate is formed between the coil assembly and the guide plate, and the coil pressure plate abuts against one side of the first contact portion and the second contact portion.

[0010] Preferably, a limiting ring is provided between the coil assembly and the guide plate, the first abutting part and the second abutting part are provided between the limiting ring and the coil pressure plate, the limiting ring is provided with a blocking part and abuts against the limiting groove, and the coil assembly is provided with a liftable iron core.

[0011] Preferably, the push rod is provided with an abutting ring and abuts against the end face of the armature. A spring is provided between the abutting ring and the contact support seat. The push rod passes through the guide sleeve and is connected and fixed to the iron core.

[0012] Preferably, at least one reinforcing rib is provided between the limiting part and the guide plate, and the limiting part and the guide plate are perpendicular to each other.

[0013] Beneficial effects:

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention uses a stop block in conjunction with a concave cavity and a coil pressure plate to ensure that the axis of the guide plate and the coil assembly are aligned on the same axis, thus preventing the axis of the push rod from shifting during lifting. The limiting part and spacing prevent the contact support from rotating left or right during lifting, ensuring that the moving and stationary contacts are aligned on the same axis, thereby extending the product's service life. Attached Figure Description

[0016] Figure 1 This is a side cross-sectional view of the contact system structure for a DC contactor according to the present invention.

[0017] The correspondence between the labels and component names in the attached figures is as follows:

[0018] Reference numerals: 1. Coil assembly; 2. Guide plate; 3. Stop block; 4. Coil pressure plate; 5. Top rod; 6. Contact support seat; 7. Armature; 8. Limiting ring; 9. Iron core; 11. First contact part; 21. Guide sleeve part; 22. Limiting part; 23. Cavity; 24. Spacing; 25. Second contact part; 26. Reinforcing rib; 51. Contact ring; 52. Spring; 71. Limiting groove; 81. Blocking part. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0022] Reference example Figure 1 A contact system structure for a DC contactor includes a coil assembly 1, a guide plate 2 covering one end of the coil assembly 1, and a stop block 3. A coil pressure plate 4 is provided between the coil assembly 1 and the guide plate 2 to prevent the coil assembly 1 from shifting its axis. The guide plate 2 has a guide sleeve 21, which has a liftable push rod 5. The push rod 5 has a contact support seat 6. Limiting portions 22 are provided on both sides of the guide plate 2, and the limiting portions 22 have cavities 23 for accommodating the stop block 3. The concave cavity 23 abuts against the side wall of the stop block 3. A gap 24 is provided between the limiting part 22 and the contact support seat 6 for the contact support seat 6 to rise and fall. The stop block 3 cooperates with the concave cavity 23, and the coil pressure plate 4 is used to make the axis of the guide plate 2 and the axis of the coil assembly 1 be on the same axis line, so as to ensure that the axis line of the push rod 5 does not shift during the rising and falling process. The limiting part 22 and the gap 24 prevent the contact support seat 6 from rotating left and right during the rising and falling process, so as to ensure that the moving contact and the stationary contact are on the same axis line.

[0023] It is worth mentioning that an armature 7 is fixedly provided on the outer wall of the guide sleeve 21, and the armature 7 is provided with a limiting groove 71. The limiting sleeve restricts the distance that the iron core 9 rises.

[0024] It is worth mentioning that the coil assembly 1 is provided with a first contact part 11, and the guide plate 2 is provided with a second contact part 25, which abuts against the first contact part 11, so that a space for accommodating the coil pressure plate 4 is formed between the coil assembly 1 and the guide plate 2. The coil pressure plate 4 abuts against one side of the first contact part 11 and the second contact part 25. The coil pressure plate 4 prevents the guide plate 2 and the coil assembly 1 from being affected by vibration, thereby causing the axis to shift.

[0025] It is worth mentioning that a limiting ring 8 is also provided between the coil assembly 1 and the guide plate 2. The first contact part 11 and the second contact part 25 are provided between the limiting ring 8 and the coil pressure plate 4. The limiting ring 8 is provided with a blocking part 81 and abuts against the limiting groove 71. The coil assembly 1 is provided with a liftable iron core 9. The limiting ring 8, in conjunction with the limiting pressure plate, further prevents the axis of the guide plate 2 from shifting from the axis of the coil assembly 1. The blocking part 81 provides a strong support point for the armature 7.

[0026] It is worth mentioning that the push rod 5 is provided with a contact ring 51 and abuts against the end face of the armature 7. A spring 52 is provided between the contact ring 51 and the contact support seat 6. The push rod 5 passes through the guide sleeve 21 and is connected and fixed to the iron core 9. The contact ring 51 limits the distance of the push rod 5's descent. The iron core 9 is affected by the magnetic field of the coil assembly 1, causing the iron core 9 to be magnetized and generate electromagnetic attraction. The iron core 9 will move towards the armature 7 and be magnetically attracted to the armature 7. At this time, the push rod 5 is pulled upward by the iron core 9, which in turn drives the contact support seat 6 to rise, pushing the moving contact and the stationary contact to abut against each other. A return spring is provided between the guide sleeve 21 and the iron core 9. When the iron core 9 loses the magnetic field, the return spring will push the iron core 9 to return to its original position. The spring 52 plays a buffering role.

[0027] It is worth mentioning that at least one reinforcing rib 26 is provided between the limiting part 22 and the guide plate 2. The limiting part 22 and the guide plate 2 are perpendicular to each other. The reinforcing rib 26 improves the connection strength between the limiting part 22 and the guide plate 2.

[0028] The above design scheme enables the product to achieve advantages such as good safety, good stability, and good heat dissipation.

[0029] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A contact system structure for a DC contactor, comprising a coil assembly (1), a guide plate (2) and a stop block (3) covering one end of the coil assembly (1), characterized in that: A coil pressure plate (4) is provided between the coil assembly (1) and the guide plate (2) to prevent the coil assembly (1) and the guide plate (2) from shifting their axis. The guide plate (2) is provided with a guide sleeve (21), which is provided with a liftable top rod (5). The top rod (5) is provided with a contact support seat (6). Limiting parts (22) are provided on both sides of the guide plate (2). The limiting parts (22) are provided with a cavity (23) for accommodating the stop block (3). The cavity (23) abuts against the side wall of the stop block (3). A gap (24) is provided between the limiting parts (22) and the contact support seat (6) for the contact support seat (6) to rise and fall.

2. The contact system structure for a DC contactor according to claim 1, characterized in that: The outer wall of the guide sleeve (21) is fixed with an armature (7), and the armature (7) is provided with a limiting groove (71).

3. The contact system structure for a DC contactor according to claim 2, characterized in that: The coil assembly (1) is provided with a first contact part (11), and the guide plate (2) is provided with a second contact part (25) and abuts against the first contact part (11), so that a space for accommodating the coil pressure plate (4) is formed between the coil assembly (1) and the guide plate (2), and the coil pressure plate (4) abuts against one side of the first contact part (11) and the second contact part (25).

4. The contact system structure for a DC contactor according to claim 3, characterized in that: A limiting ring (8) is provided between the coil assembly (1) and the guide plate (2). The first contact part (11) and the second contact part (25) are provided between the limiting ring (8) and the coil pressure plate (4). The limiting ring (8) is provided with a blocking part (81) and abuts against the limiting groove (71). The coil assembly (1) is provided with a liftable iron core (9).

5. The contact system structure for a DC contactor according to claim 1, characterized in that: The push rod (5) is provided with an abutting ring (51) and abuts against the end face of the armature (7). A spring (52) is provided between the abutting ring (51) and the contact support seat (6). The push rod (5) passes through the guide sleeve (21) and is connected and fixed to the iron core (9).

6. The contact system structure for a DC contactor according to claim 1, characterized in that: At least one reinforcing rib (26) is provided between the limiting part (22) and the guide plate (2), and the limiting part (22) and the guide plate (2) are perpendicular to each other.

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