CN216015263U - Movable contact spring, movable contact, contact structure of circuit breaker and circuit breaker - Google Patents

Abstract

The utility model provides a contact structure, circuit breaker of movable contact spring, moving contact and circuit breaker belongs to low-voltage apparatus technical field, and the movable contact spring includes that preceding, back both ends are the contact body of contact end, stiff end respectively, be equipped with adjacent main contact and vice contact on the contact end, vice contact is more the main contact is more pressed close to the front end tip of contact end, and the front side of vice contact with smooth transition between the front end tip of contact end. The utility model discloses an adopt the design of double contact and the contact setting that will add to lie in the front end, the arc extinguishing in the explosion chamber is in time, introduced effectively to the contact of ingenious utilization movable contact spring front end and explosion chamber will divide the arc that the in-process produced that divides to reduce the bearing pressure of original main contact, and then reduce and avoid main contact scaling loss even, improved the movable contact spring and used the life of the circuit breaker that has this movable contact spring.

Description

Movable contact spring, movable contact, contact structure of circuit breaker and circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus technical field especially relates to a moving contact, moving contact and circuit breaker's contact structure.

Background

A circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition for a predetermined time, and is an important part of a low-voltage distribution system. The contact and the arc extinguishing system are one of the important components brought into the circuit breaker, and the shape and the size design of the contact are very critical, and are directly related to the electrical service life and the breaking capacity of the circuit breaker.

Disclosure of Invention

The utility model provides a not enough to prior art, the utility model provides a contact structure, circuit breaker of movable contact spring, moving contact and circuit breaker solves among the prior art single or the problem that single contact easily ablates, life-span weak point, reduces the situation of contact scaling loss, improves the life of contact.

In order to achieve the above object, the movable contact spring of the utility model has the following structure: including preceding, back both ends be the contact body of contact end, stiff end respectively, be equipped with adjacent main contact and vice contact on the contact end, vice contact is more the main contact is more pressed close to the front end tip of contact end, and the front side of vice contact with smooth transition between the front end tip of contact end.

The utility model discloses well "smooth transition" means the front end terminal surface of vice contact with a smooth cambered surface or plane transitional coupling between the front end terminal surface of contact end.

The structure is characterized in that a double-contact structure is designed, the auxiliary contact is arranged at the front end of the movable contact piece, and the main contact and the auxiliary contact are in work cooperation: the main contact is used for bearing current, the auxiliary contact is used for arc discharge, and electric arcs generated when the movable contact is separated from the fixed contact through the smooth transition surface are guided to the arc extinguishing chamber above the auxiliary contact for arc extinguishing, so that the burden of the main contact is reduced, the damage of the arc discharge to the main contact can be avoided, and the service life of the main contact is prolonged.

And because the main contact does not bear the double functions of current bearing and arc discharge at the same time, the requirement on the resistivity of the main contact is reduced, and the reduction of the resistivity of the main contact can not only reduce the material cost of the movable contact piece, but also reduce the temperature rise of the main contact, thereby further prolonging the service life of the main contact.

In addition, the main contact and the auxiliary contact bear load current and arc discharge respectively, and the temperature rise of the main contact and the auxiliary contact is low, so that the circuit breaker with larger breaking current can be used.

For guaranteeing that vice contact is close and can in time draw the arc with the main contact position, the utility model discloses further set up as follows: the distance between the auxiliary contact and the main contact is 7.0-8.0 mmm.

Preferably, the distance between the secondary contact and the main contact is 7.3mm, 7.5mm or 7.7 mm.

The utility model discloses further set up as follows: on the side face or the surface perpendicular to the contact piece body and used for arranging the auxiliary contact and the main contact, the thickness of the auxiliary contact and/or the main contact is 0.5-1.5 mm, so that the auxiliary contact and the main contact have stable structures and the service life of the auxiliary contact and the main contact is ensured.

The utility model discloses further set up as follows: the auxiliary contact and the contact piece body are integrally formed, and the main contact is a silver point and is fixedly connected to the contact piece body. On one hand, the auxiliary contact and the contact body are integrally arranged, so that the obstruction of electric arc from the auxiliary contact to the contact body is reduced; on the other hand, the auxiliary contact does not need to be processed by welding spots, so that the manufacturing is convenient, and the labor cost is prevented from rising.

The utility model discloses further set up as follows: the rear side edge of the auxiliary contact is parallel to the front side edge of the main contact, so that the area of the side, opposite to the main contact, of the auxiliary contact is increased while the processing is facilitated, and the arc discharge effect of the auxiliary contact is improved.

The utility model discloses further set up as follows: the main contact and the auxiliary contact are arranged on the same side or surface of the contact piece body, so that the auxiliary contact is positioned in the range of an electric arc generated during breaking, and the direction of a connecting line between the auxiliary contact and the main contact is parallel to the direction of an arc axis of the electric arc, so that the electric arc generated during breaking is attracted by the auxiliary contact and is guided to the front end part of the contact piece body by the auxiliary contact to be extinguished; moreover, the structural design is also suitable for the actual structure of a specific product, and is convenient for direct application.

The utility model discloses further set up as follows: and on the side surface or the surface which is vertical to the contact piece body and is used for arranging the auxiliary contact and the main contact, the height of the auxiliary contact is the same as that of the main contact. The structure can lead the main contact to be firstly broken and the auxiliary contact to be firstly closed, but simultaneously lead the time difference between the breaking and closing actions of the main contact and the auxiliary contact to be very small, and ensure that the auxiliary contact has effective and good arc-pulling-resistant function.

Another object of the present invention is to provide a movable contact, which includes at least one movable contact piece as described above.

The utility model also provides a contact structure of circuit breaker, include as above moving contact and static contact, be equipped with on the static contact with the main contact of moving contact, the cooperation contact that vice contact suited are one and the cooperation contact two.

The contact structure of the circuit breaker is further provided with the following components: and the first matching contact and the second matching contact are silver points and are fixedly connected to the static contact.

An object of the utility model is also to provide a circuit breaker, including as above arbitrary the movable contact spring.

The utility model has the advantages as follows: the utility model discloses single or the single contact has changed into double contact on with movable contact spring, static contact, is favorable to the reposition of redundant personnel effect between the contact of moving contact and static contact to can reduce the temperature rise of contact department. The contact at the front end is mainly used for resisting arc discharge, and the contact at the rear side is mainly used for carrying current, so that the current can be smoothly introduced into the arc extinguish chamber through the auxiliary contact at the front end, and the main contact is ensured not to be burnt or only slightly burnt.

Secondly, the utility model discloses simple structure, be convenient for production and processing, application scope is bigger than original structure.

Drawings

Fig. 1 is an overall schematic view of a moving contact according to an embodiment of the present invention.

Fig. 2 is a schematic view of a moving contact dual-contact structure according to an embodiment of the present invention.

Fig. 3 is a schematic view of a moving contact structure according to an embodiment of the present invention.

Fig. 4 is a schematic view of the overall structure of the contact according to the embodiment of the present invention.

Reference numerals: 1. a moving contact; 2. static contact; 100. a contact body; 101. an arc transition surface; 102. hole turning; 103. a front side; 110. a first main contact; 120. a first auxiliary contact; 200. a static contact piece; 210. a first matching contact; 220. and a second mating contact.

Detailed Description

The utility model provides a contact structure, circuit breaker of movable contact spring, moving contact 1 and circuit breaker, wherein the movable contact spring is equipped with adjacent main contact and vice contact the utility model discloses in, the contact mainly used that is located the front end draws the arc, and the contact mainly used that is located the rear side bears the electric current. Through the structural design of the double contacts, the pressure of a single or single row of contacts in the breaking process can be reduced, so that the service lives of the contacts and the contact head are prolonged.

The present invention will be described in detail with reference to the following embodiments.

Embodiment 1 this embodiment provides a movable contact, as shown in fig. 1, a movable contact 1 is a flat sheet-like contact body 100 having a certain length, and when the flat surface of the contact body 100 is vertically disposed, the contact body has front and rear ends along the length direction. The contact body 100 has a through hole formed in the middle of the rear side thereof as a rotation hole 102, and the contact body 100 is mountable on a rotation shaft through the rotation hole 102 thereon and swings about the rotation shaft. The rear end of the contact body 100 is a fixed end, on which a structure for matching or connecting with other structures can be arranged, in fig. 1, the fixed end of the contact body 100 is provided with a groove, and the contact body 100 is fixed with the support of the contact body 100 through the groove.

The front end of the contact body 100 is a contact end, which can be close to or far away from the stationary contact 2 when the contact body 100 swings, and the front side 103 of the contact end in fig. 1 is designed to be smooth and has an arc striking head extending upwards continuously from the upper side. As shown in fig. 2, a first main contact 110 and a first auxiliary contact 120 are disposed on the bottom side of the contact end, wherein the first auxiliary contact 120 is disposed at the front end of the contact end, the first main contact 110 is disposed behind the first auxiliary contact, and the front side end surface of the first auxiliary contact 120 and the front side surface 103 of the contact end are in transition connection with each other through a smooth cambered surface transition surface 101 to form smooth transition.

Because the front side end face of the first auxiliary contact 120 is directly connected with the contact end and is in smooth transition, an electric arc generated in the breaking process of the first main contact 110 and the first auxiliary contact 120 (see the first mating contact 210 in fig. 4) can directly move to the front end of the contact body 100 along the arc transition surface 101 after contacting with the first auxiliary contact 120, and continuously move upwards along the front side face 103 of the contact end opposite to the bottom face where the first auxiliary contact 120 and the first main contact 110 are located, so that the electric arc generated in breaking can be quickly guided to the front end of the contact body 100 to be extinguished, the electric arc is prevented from staying on the first auxiliary contact 120 or staying on the first auxiliary contact 120 for too long time, and the negative influence of the electric arc generated in breaking on the first main contact 110 is further reduced.

Referring to fig. 3, in order to allow the first auxiliary contact 120 to cooperate with the first main contact 110 for arc discharge and to prevent the first auxiliary contact 120 from carrying current, the distance d0 between the first auxiliary contact 120 and the first main contact 110 is 7.0-8.0 mmm. In the present embodiment, the distance d0 between the first secondary contact 120 and the first primary contact 110 is exemplified as follows: 7.3mm, 7.5mm or 7.7 mm. In the direction perpendicular to the bottom surface of the contact body 100, as shown in fig. 4, the thickness of the first main contact 110 is 0.5 to 1.5 mm.

In addition, in the embodiment, in the direction perpendicular to the bottom surface of the contact blade body 100, the height of the first auxiliary contact 120 is the same as that of the first main contact 110, so that the opening and closing time between the first main contact 110 and the first auxiliary contact 120 is very close, and the synchronism of the first auxiliary contact 120 and the first main contact 110 in the corresponding mating contact is further improved.

In view of the differences between the functions of the first secondary contact 120 and the first primary contact 110, the first secondary contact 120 may be integrally formed with the contact body 100, and the first primary contact 110 may be silver and soldered to the contact body 100.

In the existing contact and arc extinguishing system, when a fault occurs in a circuit, an operating mechanism drives a moving contact 1 to swing so as to enable the moving contact to be rapidly separated from a static contact 2, and an arc is extinguished in an arc extinguishing chamber above the moving contact 1 and the static contact 2. The existing moving contact 1 and the static contact 2 are only provided with a single contact or a single row of contacts, and the contacts have double functions of current bearing and arc discharge, so that the contact burning is serious, and the product service life of the circuit breaker is greatly influenced.

In the embodiment, through the structural design of the double contacts, the single contact mainly only plays one role, particularly, the first auxiliary contact 120 at the front end is mainly used for resisting arc discharge, and the first main contact 110 at the rear side is mainly used for carrying current, so that the probability of ablation of the first main contact 110 is reduced, and the service lives of the first main contact 110 and the circuit breaker product are prolonged.

Example 2 this example differs from example 1 in that: in the movable contact piece of the present embodiment, the rear side edge of the first auxiliary contact 120 is parallel to the front side edge of the first main contact 110, and this structure is easier to process for the movable contact piece in the shape of a sheet as shown in embodiment 1. And the rear side edge of the first auxiliary contact 120 can be close to the front side edge of the first main contact 110 as much as possible, so that the arc-drawing effect of the first auxiliary contact 120 on the first main contact 110 is enhanced by using the closer and longer side edges in the breaking process.

Embodiment 3 this embodiment provides a movable contact 1 comprising a plurality of movable contact pieces as provided in embodiment 1 or embodiment 2, the plurality of movable contact pieces being aligned and connected as a whole by a bracket, the flat surfaces of adjacent movable contact pieces preferably being spaced in parallel.

Embodiment 4 this embodiment provides a movable contact 1, which is different from embodiment 3 in that, in this embodiment, the movable contact 1 includes only 1 to 2 movable contact pieces, and when the number of the movable contact pieces is two, it is preferable that adjacent movable contact pieces are also connected by a bracket.

Embodiment 5 this embodiment provides a contact structure of a circuit breaker, as shown in fig. 4, including the movable contact 1 and the fixed contact 2 of embodiment 3, in the circuit breaker, the movable contact 1 includes a plurality of movable contacts, so the fixed contact 2 includes a fixed contact 200 having a certain width, and the fixed contact 200 is provided with a first mating contact 210 and a second mating contact 220 corresponding to the positions of the first main contact 110 and the first auxiliary contact 120 of the movable contact 1. Correspondingly, the second mating contact 220 and the first mating contact 210 are both strip contacts with a certain width and are arranged in parallel at intervals. In this embodiment, the first mating contact 210 and the second mating contact 220 are both silver points and are fixedly connected to the stationary contact 2.

In the use process, when the movable contact 1 and the fixed contact 2 are separated from the closed state, the first auxiliary contact 120 and the second mating contact 220 are separated from the first mating contact 210 before the first main contact 110: in the process, the first auxiliary contact 120 introduces the generated electric arc into the arc extinguish chamber by using the end face smoothly transited with the front side face of the contact piece body 100 when being separated, and the first main contact 110 and the first mating contact 210 are still contacted and bear the breaking current. Then, the first main contact 110 is separated from the first mating contact 210, and the first auxiliary contact 120 continues to guide the arc into the arc extinguishing chamber for arc extinguishing. The current on the first main contact 110 and the first mating contact 210 is depleted.

Embodiment 6 this embodiment provides a contact structure of a circuit breaker, which is different from embodiment 5 in that: the first main contact 110 is a silver point and is fixedly connected to the static contact 2, and the first auxiliary contact 120 is a protrusion structure on the static contact 200 at a corresponding position, and the protrusion can be formed by punching.

Embodiment 7 this embodiment provides a circuit breaker including a movable contact piece as provided in embodiment 1 or embodiment 2 above.

To sum up, the utility model provides a simple structure, the movable contact spring of preparation and use of being convenient for, this movable contact spring adopt the design of double contact and the contact setting that will add lie in the front end, and the contact of 1 front end of ingenious utilization moving contact and explosion chamber will divide the arc that the in-process produced in the branch in time, introduce the explosion chamber effectively in the arc extinguishing to reduce the bearing pressure of original main contact, and then reduce and avoid the main contact scaling loss even, improved the movable contact spring and applied the life who has the circuit breaker of this movable contact spring.

Claims (10)

1. The utility model provides a movable contact spring, includes that preceding, back both ends are the contact body of contact end, stiff end respectively, its characterized in that: the contact end is provided with an adjacent main contact and an adjacent auxiliary contact, the auxiliary contact is closer to the front end part of the contact end than the main contact, and the front side of the auxiliary contact and the front end part of the contact end are in smooth transition.

2. The movable contact spring as claimed in claim 1, wherein: the distance between the auxiliary contact and the main contact is 7.0-8.0 mmm;

alternatively, the distance between the secondary contact and the primary contact is 7.3mm, 7.5mm or 7.7 mm.

3. The movable contact spring as claimed in claim 1, wherein: the thickness of the auxiliary contact and/or the main contact is 0.5-1.5 mm on the side surface or the surface which is perpendicular to the contact piece body and used for arranging the auxiliary contact and the main contact;

and/or the height of the auxiliary contact is the same as that of the main contact on the side surface or the surface which is perpendicular to the contact piece body and used for arranging the auxiliary contact and the main contact.

4. The movable contact spring as claimed in claim 1, wherein: the main contact and the auxiliary contact are arranged on the same side surface or surface of the contact piece body.

5. The movable contact spring as claimed in any one of claims 1 to 4, wherein: the auxiliary contact and the contact piece body are integrally formed, and the main contact is a silver point and is fixedly connected to the contact piece body.

6. The movable contact spring as claimed in claim 5, wherein: the rear side of the secondary contact is parallel to the front side of the primary contact.

7. A moving contact is characterized in that: comprising at least one movable contact as claimed in any one of the preceding claims 1-6.

8. A contact structure of a circuit breaker, characterized in that: the moving contact and the static contact as claimed in claim 7, wherein the static contact is provided with a first mating contact and a second mating contact which are matched with the main contact and the auxiliary contact of the moving contact.

9. The contact structure of a circuit breaker according to claim 8, wherein: and the first matching contact and the second matching contact are silver points and are fixedly connected to the static contact.

10. A circuit breaker, characterized by: comprising a movable contact piece as claimed in any one of the preceding claims 1-5.

Images