Contact system structure for increasing the life of a dc contactor

Abstract

The utility model discloses a kind of contact system structure for improving life of direct current contactor, the contact system structure for improving life of direct current contactor includes contact support seat, guide plate, coil assembly, the coil assembly is equipped with liftable core, the guide plate is equipped with liftable ejector rod, buffer spring is equipped between the contact support seat and ejector rod, so that ejector rod is tightly pressed on guide plate, one end of the ejector rod is equipped with first connecting part, and passes through contact support seat, the other end of the ejector rod is equipped with second connecting part, and passes through core, the contact support seat, the first gasket is equipped in one end of core, the first connecting part, second connecting part are equipped with snap spring, and abut first gasket.Impact force generated by impact is evenly distributed to snap spring by first gasket, avoid local force of snap spring, and then prolong the service life of snap spring, prevent contact support seat, core from separating from the connection of ejector rod, so that product has the advantages of improving service life, impact resistance.

Description

Technical Field

[0001] This utility model relates to the field of DC contactor technology, and in particular to a contact system structure for improving the lifespan of 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 contact support seat is equipped with a push rod for pushing it up. The push rod is equipped with a retaining spring to prevent the contact support seat from disengaging from the push rod. When the push rod switches back and forth between the rising and falling states for a long time, the contact support seat will collide and impact with the retaining spring. Over time, the retaining spring will be subjected to excessive impact force locally, reducing its service life. In severe cases, it will disengage from its fixed position, causing the DC circuit breaker to malfunction. 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 traditional DC contactor design and provide a product with improved service life and impact resistance.

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

[0007] A contact system structure for improving the lifespan of a DC contactor includes a contact support, a guide plate, and a coil assembly. The coil assembly contains a liftable iron core, and the guide plate has a liftable top rod. A buffer spring is provided between the contact support and the top rod to press the top rod tightly against the guide plate. One end of the top rod has a first connecting portion that passes through the contact support, and the other end of the top rod has a second connecting portion that passes through the iron core. A first washer is provided at one end of the contact support and the iron core. The first connecting portion and the second connecting portion have retaining rings that abut against the first washer. A second washer is provided inside the iron core and abuts against one end of the top rod.

[0008] Preferably, the outer walls of the first connecting part and the second connecting part are provided with grooves for accommodating the retaining spring.

[0009] Preferably, one end of the contact support is provided with a countersunk hole for accommodating the first gasket.

[0010] Preferably, the guide plate abuts against the end face of the coil assembly, the guide plate is provided with a guide sleeve, and the outer wall of the guide sleeve is provided with an armature.

[0011] Preferably, the coil assembly has a stop portion.

[0012] Preferably, the push rod passes through the guide sleeve, the push rod is provided with an abutting ring and abuts against the end face of the guide sleeve, and the outer wall of the push rod is provided with a return spring, one end of the return spring abuts against the guide sleeve and the other end abuts against the second gasket.

[0013] Preferably, the iron core is provided with a blind hole for accommodating the second washer and the return spring, the iron core is provided with a limiting part and is pressed tightly against the stop part, and the iron core is located below the armature.

[0014] Beneficial effects:

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] In this invention, the impact force generated by the impact is evenly distributed to the retaining spring through the first washer, avoiding localized stress on the retaining spring, thereby extending the service life of the retaining spring and preventing the contact support seat and iron core from detaching from the connection with the push rod, giving the product the advantages of improved service life and impact resistance. Attached Figure Description

[0017] Figure 1 This is a side cross-sectional view of the contact system structure for improving the lifespan of a DC contactor according to the present invention.

[0018] Reference numerals: 1. Contact support seat; 2. Guide plate; 3. Coil assembly; 4. Iron core; 5. Push rod; 6. Buffer spring; 7. First washer; 8. Snap ring; 9. Armature; 11. Countersunk hole; 21. Guide sleeve; 31. Stop; 41. Second washer; 42. Blind hole; 43. Limiting part; 51. First connecting part; 52. Second connecting part; 53. Groove; 54. Abutment ring; 55. Return spring. 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 improving the service life of a DC contactor includes a contact support 1, a guide plate 2, and a coil assembly 3. The coil assembly 3 has a liftable iron core 4, and the guide plate 2 has a liftable top rod 5. A buffer spring 6 is provided between the contact support 1 and the top rod 5 to press the top rod 5 tightly against the guide plate 2. One end of the top rod 5 has a first connecting part 51 and passes through the contact support 1, and the other end of the top rod 5 has a second connecting part 52 and passes through the iron core 4. One end of the contact support 1 and the iron core 4 has a first pad 7. The first connecting part 51 and the second connecting part 52 have a retaining spring 8 and abut against the first pad 7. The iron core 4 has a second pad 41 and abuts against one end of the top rod 5. The impact force generated by the impact is evenly distributed to the retaining spring 8 through the first pad 7 to avoid local stress on the retaining spring 8, thereby extending the service life of the retaining spring 8 and preventing the contact support 1 and the iron core 4 from detaching from the connection with the first connecting part 51 and the second connecting part 52, respectively.

[0023] It is worth mentioning that the outer walls of the first connecting part 51 and the second connecting part 52 are provided with grooves 53 for accommodating the retaining spring 8. The grooves 53 provide strong support for the retaining spring 8 and prevent the retaining spring 8 from being dislodged from its current fixed position due to impact.

[0024] It is worth mentioning that one end of the contact support 1 is provided with a countersunk hole 11 to accommodate the first gasket 7;

[0025] It is worth mentioning that the guide plate 2 abuts against the end face of the coil assembly 3. The guide plate 2 is provided with a guide sleeve 21, and the outer wall of the guide sleeve 21 is provided with an armature 9. The guide sleeve 21 provides a strong support limit point for the contact ring 54, and at the same time, it also provides a guiding function for the lifting and lowering of the push rod 5.

[0026] It is worth mentioning that the coil assembly 3 is provided with a stop 31, which limits the distance the iron core 4 descends;

[0027] It is worth mentioning that the push rod 5 passes through the guide sleeve 21. The push rod 5 is provided with an abutting ring 54 and abuts against the end face of the guide sleeve 21. The outer wall of the push rod 5 is provided with a return spring 55. One end of the return spring 55 abuts against the guide sleeve 21 and the other end abuts against the second washer 41. The abutting ring 54 limits the distance of the push rod 5 and the iron core 4 descending.

[0028] It is worth mentioning that the iron core 4 is provided with a blind hole 42 for accommodating the second pad 41 and the return spring 55. The iron core 4 is provided with a limiting part 43 and is pressed tightly against the stop part 31. The iron core 4 is located below the armature 9. When the iron core 4 is affected by the magnetic field of the coil assembly 3, the iron core 4 is magnetized and generates electromagnetic attraction, thereby overcoming the reaction force of the return spring 55. The iron core 4 will move towards the armature 9 and be magnetically attracted to the armature 9, so that the return spring 55 is squeezed and stores energy. After the iron core 4 loses the magnetic field, the return spring 55 releases its elastic force, so that the limiting part 43 abuts against the stop ring. The blind hole 42 increases the accommodating space of the return spring 55.

[0029] The above design scheme can enable the product to achieve the advantages of increased service life and impact resistance.

[0030] 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 improving the service life of a DC contactor, comprising a contact support (1), a guide plate (2), and a coil assembly (3), wherein the coil assembly (3) contains a liftable iron core (4), characterized in that: The guide plate (2) is provided with a liftable top rod (5). A buffer spring (6) is provided between the contact support seat (1) and the top rod (5) to press the top rod (5) tightly against the guide plate (2). One end of the top rod (5) is provided with a first connecting part (51) and passes through the contact support seat (1). The other end of the top rod (5) is provided with a second connecting part (52) and passes through the iron core (4). One end of the contact support seat (1) and the iron core (4) is provided with a first gasket (7). The first connecting part (51) and the second connecting part (52) are provided with snap rings (8) and abut against the first gasket (7). The iron core (4) is provided with a second gasket (41) and abuts against one end of the top rod (5).

2. The contact system structure for improving the service life of a DC contactor according to claim 1, characterized in that: The outer walls of the first connecting part (51) and the second connecting part (52) are provided with grooves (53) for accommodating the retaining ring (8).

3. The contact system structure for improving the service life of a DC contactor according to claim 1, characterized in that: One end of the contact support (1) is provided with a countersunk hole (11) for accommodating the first gasket (7).

4. The contact system structure for improving the service life of a DC contactor according to claim 1, characterized in that: The guide plate (2) abuts against the end face of the coil assembly (3). The guide plate (2) is provided with a guide sleeve (21), and the outer wall of the guide sleeve (21) is provided with an armature (9).

5. The contact system structure for improving the service life of a DC contactor according to claim 4, characterized in that: The coil assembly (3) is provided with a stop (31).

6. The contact system structure for improving the service life of a DC contactor according to claim 5, characterized in that: The push rod (5) passes through the guide sleeve (21). The push rod (5) is provided with an abutting ring (54) and abuts against the end face of the guide sleeve (21). The outer wall of the push rod (5) is provided with a return spring (55). One end of the return spring (55) abuts against the guide sleeve (21), and the other end abuts against the second gasket (41).

7. The contact system structure for improving the service life of a DC contactor according to claim 6, characterized in that: The iron core (4) is provided with a blind hole (42) for accommodating the second pad (41) and the return spring (55). The iron core (4) is provided with a limiting part (43) and is pressed tightly against the stop part (31). The iron core (4) is located below the armature (9).

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