CN217061924U - High-insulation-performance auxiliary contact structure of direct-current contactor - Google Patents

Abstract

The utility model discloses a high insulating properties auxiliary contact structure of direct current contactor, include: the auxiliary insulation push rod can be pushed by a movable contact component in the direct current contactor to move upwards so as to drive the auxiliary movable spring to be in contact with and conducted with the auxiliary static spring to carry out trigger signals; the auxiliary insulating push rod is provided with an annular concave-convex structure around the periphery, and a creepage path is formed on the concave-convex structure along the outer edge of the concave-convex structure. This high insulating properties auxiliary contact structure of direct current contactor can increase the creepage distance between main contact and supplementary movable contact spring, the supplementary stationary contact spring, improves its insulating properties, can not increase the product volume, avoids influencing the customer and uses, saves product manufacturing cost.

Description

High-insulation-performance auxiliary contact structure of direct-current contactor

Technical Field

The utility model relates to a direct current contactor technical field, in particular to direct current contactor high insulating properties auxiliary contact structure.

Background

The direct current contactor on the market at present comprises five major parts, namely an electromagnetic part, a moving part, a contact part, an arc extinguishing part and a mounting part. The electromagnetic part is responsible for converting electric energy into kinetic energy; the moving part is responsible for the connection between the electromagnetic part and the contact part; the contact part is responsible for executing the on-off of the contactor; the arc extinguishing part is used for extinguishing the arc generated when the contact part is disconnected; the mounting portion is responsible for providing a user mounting location. In the partial direct current contactor, a contact part comprises a main contact part and an auxiliary contact part, and the auxiliary contact part is used for controlling on-off of small current and controlling operation signal indication.

With the development of the photovoltaic solar energy industry, the power transmission power is increased day by day, the transmission voltage must be increased, the voltage is gradually increased from 200-300 VDC to 1500VDC, and therefore the requirement of the minimum creepage distance between the main contact and the auxiliary contact is increased more and more. The existing structure mainly utilizes an insulating push rod to form creepage distance between a main contact and an auxiliary contact, and the distance is too small, so that the requirement of 1500VDC minimum creepage distance in the photovoltaic solar field can not be met, if the creepage distance is increased, the length of the insulating push rod needs to be increased, the product volume is greatly increased, the use of customers is influenced, and the manufacturing cost of the product is also greatly increased.

Disclosure of Invention

The utility model aims to solve the problem that a DC contactor high insulating properties auxiliary contact structure is provided to creepage distance is less and can't satisfy the defect of insulating properties requirement between main contact and auxiliary contact in overcoming current DC contactor.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: a high insulating property auxiliary contact structure of a direct current contactor comprises: the auxiliary insulation push rod can be pushed by a movable contact component in the direct current contactor to move upwards so as to drive the auxiliary movable spring to be in contact with and conducted with the auxiliary static spring to carry out trigger signals; the auxiliary insulating push rod is provided with an annular concave-convex structure around the periphery, and a creepage path is formed on the concave-convex structure along the outer edge of the concave-convex structure.

As a further improvement of the present invention, the concave-convex structure is formed by at least one annular boss provided around the periphery of the auxiliary insulating push rod.

As a further improvement of the utility model, the longitudinal section of the annular boss is square.

As a further improvement, the annular boss is provided with more than two, adjacent two the annular boss is interval distribution.

As a further improvement of the utility model, the longitudinal section of the annular boss is triangular.

As a further improvement, the annular boss is provided with more than two, adjacent two the annular boss is interval or continuous distribution.

As a further improvement, the shielding shell is located the concave storage tank that is equipped with in middle part, supplementary insulating push rod is installed in this storage tank.

As a further improvement, a through hole has been seted up to the storage tank bottom, the lower extreme of supplementary insulating push rod alternates in the through hole and extend to shielding shell's inside.

As a further improvement, the storage tank is located the circumference outside of through-hole is formed with and is used for right the annular boss carries out the spacing bottom plate of backstop.

As a further improvement, the upper end middle part of the auxiliary insulation push rod is formed with a convex point in an upward protruding manner, and the convex point is positioned under a end part of the auxiliary movable contact spring.

The beneficial effects of the utility model are that: the utility model provides a high insulating properties auxiliary contact structure of direct current contactor, through be provided with annular concave-convex structure on the auxiliary insulation push rod, this concave-convex structure is formed along at least one annular boss that auxiliary insulation push rod set up around the periphery for on concave-convex structure along its outside edge form main contact and supplementary movable contact spring, supplementary quiet reed creep-over route, and then increase the creep-over distance between main contact and supplementary movable contact spring, supplementary quiet reed, improve its insulating properties; meanwhile, the structure can not cause the increase of the volume of the product, thereby avoiding influencing the use of customers and saving the manufacturing cost of the product.

Drawings

Fig. 1 is a perspective view of the high insulation performance auxiliary contact structure of the dc contactor of the present invention;

fig. 2 is a cross-sectional view of the high insulation performance auxiliary contact structure of the dc contactor of the present invention, the stationary contact and the movable contact assembly;

FIG. 3 is an enlarged view of A in FIG. 2 according to the present invention;

FIG. 4 is a front view of the auxiliary insulating rod of the present invention;

fig. 5 is a front view of another embodiment of the auxiliary insulating push rod of the present invention;

FIG. 6 is a front view of another embodiment of the auxiliary insulating push rod of the present invention;

wherein the arrows in fig. 4 indicate the creepage path.

The following description is made with reference to the accompanying drawings:

1-shielding shell; 101-a containing groove;

102-through hole; 103-a limit bottom plate;

2-auxiliary static reed; 3-auxiliary movable reed;

4-auxiliary insulating push rod; 401 — annular boss;

402-bump; 5-main contact;

6-moving contact piece.

Detailed Description

The following description of the preferred embodiments of the present invention will be made in conjunction with the accompanying drawings.

Referring to fig. 1, the utility model provides a high insulating properties auxiliary contact structure of direct current contactor, include: the shield comprises a shield shell 1, and an auxiliary static reed 2, an auxiliary movable reed 3 and an auxiliary insulation push rod 4 which are arranged on the shield shell 1. The respective one ends of the auxiliary static reed 2 and the auxiliary movable reed 3 are fixed at the top of the shielding shell 1 near the periphery, the respective other ends extend to the center of the top of the shielding shell 1, and the end of the auxiliary movable reed 3 is positioned right below the end of the auxiliary static reed 2. The auxiliary movable reed 3 has a certain elastic deformation capacity and can swing up and down for a certain distance so as to be in contact with or separated from the auxiliary static reed 2.

Referring to fig. 2 to 4, the auxiliary insulation push rod 4 is movably mounted at the top center of the shielding shell 1 and is located right below the corresponding end of the auxiliary movable spring 3. Two main contacts 5 are symmetrically and fixedly installed on two sides of the auxiliary insulating push rod 4 of the shielding shell 1, and a movable contact assembly in the direct current contactor is driven by an electromagnetic driving device, and a push rod in the movable contact assembly drives a movable contact 6 to reciprocate up and down in the shielding shell 1, so that the movable contact 6 is in contact with the two main contacts 5 to conduct a working circuit or separate and break the working circuit. When the movable contact component moves upwards, the auxiliary insulating push rod 4 can be pushed to move upwards to drive the auxiliary movable spring piece 3 to be in contact with and conducted with the auxiliary static spring piece 2 to carry out a trigger signal; when the movable contact component moves downwards, the auxiliary insulating push rod 4 moves downwards under the action of self gravity and the reset elastic force of the auxiliary movable spring piece 3, and the auxiliary movable spring piece 3 is separated from the auxiliary static spring piece 2. Supplementary insulating push rod 4 is provided with annular concave-convex structure around the periphery, be used for forming main contact 5 and supplementary movable contact spring 3 along its outside edge on concave-convex structure, the creepage path between supplementary quiet reed 2, and then can increase the length on creepage path, increase main contact 5 and supplementary movable contact spring 3 promptly, creepage distance between supplementary quiet reed 2, improve its insulating properties, consequently, the length that need not to increase supplementary insulating push rod 4 can satisfy the demands, avoid increasing product volume and influence the customer and use, save product manufacturing cost.

It should be further noted that, in the closed state of the dc contactor, the movable contact 6 and the mounting bracket thereon are all electrified, and the creepage distance between the main contact 5 and the auxiliary movable spring piece 3 and the auxiliary stationary spring piece 2 is actually the creepage distance between the mounting bracket and the auxiliary movable spring piece 3 and the auxiliary stationary spring piece 2.

Specifically, referring to fig. 4, the concave-convex structure is formed by at least one annular boss 401 disposed around the outer circumference of the auxiliary insulating push rod 4. In the present application, the longitudinal cross section of the annular boss 401 may be square, and the increased creepage distance is the length of the upper and lower edges of the cross section of the annular boss 401. It is understood that the number of the annular bosses 401 can be one, two or even more, and the effect of increasing the creepage distance can be achieved. When the annular bosses 401 are provided with more than two, two adjacent annular bosses 401 need to be distributed at intervals, and the intervals can be configured according to different pollution levels, different voltages and the like.

As another preferred embodiment of the present application, referring to fig. 5 and fig. 6, the longitudinal cross section of the annular protrusion 401 may also be triangular, and when more than two annular protrusions 401 are provided, two adjacent annular protrusions 401 may be distributed at intervals, or may be distributed continuously, and the effect of increasing the creepage distance may also be achieved.

Besides, the longitudinal section of the annular boss 401 may be polygonal or other shapes not illustrated, which aims to prolong the creepage path and meet the requirement of increasing creepage distance by the arrangement compared with the conventional cylindrical push rod.

Wherein, the outside apex angle department of annular boss 401 all is provided with the chamfer, avoids having the burr to drop and causes the potential safety hazard in shielding shell 1.

In this embodiment, the auxiliary insulating push rod 4 is made of PPS, and has excellent electrical insulation.

The specific mounting structure of the auxiliary insulating pushrod 4 will be described in detail below.

Referring to fig. 2 and 3, a cylindrical receiving groove 101 is concavely formed in the middle of the shielding shell 1, an inner diameter of the receiving groove 101 is slightly larger than an outer diameter of the auxiliary insulating push rod 4, and the auxiliary insulating push rod 4 is disposed in the receiving groove 101. The bottom of the receiving groove 101 is formed with a through hole 102, and the size of the through hole 102 is matched with the outer diameter of the lower end of the auxiliary insulating push rod 4, so as to play a guiding role. The lower end of the auxiliary insulation push rod 4 is inserted into the through hole 102 and extends to the inside of the shielding shell 1, and is positioned above the movable contact component. The containing groove 101 is located outside the circumference of the through hole 102 to form a limiting bottom plate 103, and the limiting bottom plate 103 is used for limiting the stop of the annular boss 401 to prevent the annular boss from falling.

The middle part of the upper end of the auxiliary insulating push rod 4 protrudes upwards to form a salient point 402, the salient point 402 is positioned right below the corresponding end part of the auxiliary movable reed 3, and the auxiliary movable reed 3 is pushed to move through the salient point 402, so that the auxiliary movable reed 3 is stably contacted with the auxiliary static reed 2.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims (10)

1. A high-insulation-performance auxiliary contact structure of a direct current contactor comprises a shielding shell (1), an auxiliary static reed (2), an auxiliary movable reed (3) and an auxiliary insulation push rod (4) which can move up and down, wherein the auxiliary static reed (2), the auxiliary movable reed (3) and the auxiliary insulation push rod (4) are arranged on the shielding shell (1), and the auxiliary insulation push rod (4) can be pushed by a movable contact assembly in the direct current contactor to move upwards so as to drive the auxiliary movable reed (3) to be in contact with and conducted with the auxiliary static reed (2) to carry out a trigger signal; the method is characterized in that: the auxiliary insulating push rod (4) is provided with an annular concave-convex structure around the periphery and used for forming a creepage path on the concave-convex structure along the outer edge of the concave-convex structure.

2. The high insulation performance auxiliary contact structure of the direct current contactor according to claim 1, wherein: the concave-convex structure is formed by at least one annular boss (401) arranged around the periphery of the auxiliary insulating push rod (4).

3. The high-insulation auxiliary contact structure of the direct current contactor according to claim 2, wherein: the longitudinal section of the annular boss (401) is square.

4. The high insulation performance auxiliary contact structure of the DC contactor according to claim 3, wherein: the annular bosses (401) are more than two, and the adjacent annular bosses (401) are distributed at intervals.

5. The high insulation performance auxiliary contact structure of the direct current contactor according to claim 2, wherein: the longitudinal section of the annular boss (401) is triangular.

6. The high-insulation auxiliary contact structure of the direct current contactor according to claim 5, wherein: more than two annular bosses (401) are arranged, and two adjacent annular bosses (401) are distributed at intervals or continuously.

7. The high insulation performance auxiliary contact structure of the direct current contactor according to claim 2, wherein: the shielding shell (1) is provided with a containing groove (101) in the middle, and the auxiliary insulating push rod (4) is arranged in the containing groove (101).

8. The high insulation performance auxiliary contact structure of a DC contactor according to claim 7, wherein: the bottom of the accommodating groove (101) is provided with a through hole (102), and the lower end of the auxiliary insulating push rod (4) is inserted into the through hole (102) and extends into the shielding shell (1).

9. The high insulation performance auxiliary contact structure of the direct current contactor according to claim 8, wherein: and a limiting bottom plate (103) used for stopping the annular boss (401) is formed on the circumference outer side of the through hole (102) of the accommodating groove (101).

10. The high-insulation auxiliary contact structure of the direct current contactor according to claim 1, wherein: the middle part of the upper end of the auxiliary insulating push rod (4) protrudes upwards to form a salient point (402), and the salient point (402) is positioned right below one end part of the auxiliary movable reed (3).

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