CN105788954A - Vacuum circuit breaker - Google Patents

Abstract

The invention relates to a vacuum circuit breaker. The vacuum circuit breaker of the invention includes a shell with a cavity arranged therein, a fixed contact, a moving contact, a switching moving contact, an operation portion, a telescopic pin and a pushing rod; a partition plate is arranged in the shell; the partition plate divides the cavity into an upper cavity and a lower cavity; the fixed contact is arranged at the top of the upper cavity; the moving contact is arranged below the fixed contact; the moving contact is fixed to the upper part of the pushing rod; the switch moving contact is arranged at the bottom of the lower cavity; the bottom of the pushing rod extends into the operation portion; two sides of the inner side wall of the lower cavity of the shell are symmetrically provided with a first trench and a second trench; the lower part of the pushing rod is provided with a slide way; and the telescopic pin is arranged in the slide way. According to the vacuum circuit breaker of the invention, when the moving contact contacts with the fixed contact, supporting portions at two ends of the telescopic pin extend into the first trench, the lower side surfaces of the outer end portions of the supporting portions contact with the lower side surface of the first trench, and therefore, the tripping of the vacuum circuit breaker can be prevented when the vacuum circuit breaker is in a switched-on state. The vacuum circuit breaker has the advantages of simple structure and low manufacturing cost.

Description

A vacuum circuit breaker

technical field

The invention belongs to the field of electric power, in particular to a vacuum circuit breaker.

Background technique

In the power distribution system, the existing vacuum circuit breaker is equipped with a locking device in the open state to avoid misoperation, but in order to ensure the normal operation of the vacuum circuit breaker, the vacuum circuit breaker in the prior art is also provided with a locking device in the closed state. The locking device usually uses a magnet to lock the circuit breaker to solve the tripping of the circuit breaker, but the magnetism of the magnet is easily affected by the external magnetic field and the locking device becomes invalid.

Contents of the invention

The technical problem to be solved by the present invention is to provide a vacuum circuit breaker to ensure that the vacuum circuit breaker solves the tripping of the circuit breaker in the closed state and ensures the normal operation of the vacuum circuit breaker.

In order to solve the above technical problems, the present invention includes: a housing with a cavity inside, a static contact, a moving contact, a switch moving contact, an operating part, a retractable pin and a push rod, and a partition is provided inside the housing , the partition divides the cavity into an upper cavity and a lower cavity, a guide hole is provided on the partition, the upper end of the ejector rod is inserted into the guide hole, and the static contact is arranged on the top of the upper cavity, so The movable contact is arranged below the static contact, the movable contact is fixed on the upper part of the push rod, the switch movable contact is arranged at the bottom of the lower cavity, the operating part is a cylinder with an open upper end, and the operating part The bottom plate of the switch is fixed in the middle of the switch movable contact, the bottom of the ejector rod extends into the operation part, the bottom of the ejector rod is provided with a hollowed out part, and the top of the switch movable contact is inserted into the hollowed out part to be slidably connected with the ejector rod , a first groove and a second groove are symmetrically arranged on both sides of the inner wall of the lower cavity of the housing, the first groove is located on the upper part of the second groove, and the lower sides of the first groove and the second groove are in line with the The axis of the ejector rod is vertical, and the angle between the upper side of the second groove and the axis of the ejector rod is an acute angle. The telescopic pin includes two support parts and an elastic telescopic element connecting the two support parts. The axis of the ejector rod is vertical, the angle between the upper side of the outer end of the support part and the ejector rod is an acute angle, the lower part of the ejector rod is provided with a slideway, the slideway is perpendicular to the axis of the ejector rod, and the telescopic pin is arranged in the slideway , the side of the operation part is symmetrically provided with through holes, and the support parts at both ends of the telescopic pin protrude from the through holes. The bottom of the telescopic pin is in contact with the bottom of the telescopic pin, and the supporting parts at both ends of the telescopic pin extend into the first groove, and the lower side of the outer end of the supporting part contacts the lower side of the first groove. The end surface is separated from the bottom of the hollowed out part, the bottom surface of the operating part is in contact with the bottom surface of the lower cavity of the housing, the lower side of the outer end of the support part is in contact with the lower side of the second groove, and the upper surface of the through hole on the side of the operating part is in contact with the The upper side of the outer end of the support part is in contact.

As a further improvement of the present invention, the elastic telescopic element is a coil spring.

The beneficial effects of the present invention are: in the vacuum circuit breaker of the present invention, when the moving contact contacts the static contact, the supporting parts at both ends of the telescopic pin extend into the first groove, and the lower side of the outer end of the supporting part is in contact with the lower side of the first groove. The side contact ensures that the vacuum circuit breaker prevents the circuit breaker from tripping when it is in the closed state. The invention has simple structure, low manufacturing cost, and ensures the normal operation of the vacuum circuit breaker.

Description of drawings

Fig. 1 is a structural representation of a vacuum circuit breaker in the present invention when it is closed;

Fig. 2 is a schematic diagram of the structure of the vacuum circuit breaker in the present invention when it is opened;

Fig. 3 is a partially enlarged view of part A in Fig. 1 .

Among them: 1. Static contact, 2. Housing, 3. Operating part, 4. Moving contact, 5. Hollow part, 6. Retractable pin, 7. Fastener, 8. Switch moving contact, 9. The first groove, 10, the second groove, 11, the ejector rod, 61, the supporting part, 62, the elastic telescopic element.

detailed description

As shown in Fig. 1, Fig. 2 and Fig. 3, the present invention includes: the present invention includes: a housing 2 with a cavity inside, a static contact 1, a moving contact 4, a switch moving contact 8, an operating part 3, Telescoping pin 6 and push rod 11, described casing 2 interior is provided with partition, and described partition divides cavity into upper cavity and lower cavity, and described partition is provided with guide hole, and described push rod 11 The upper end is inserted into the guide hole, the static contact 1 is arranged on the top of the upper cavity, the movable contact 4 is arranged below the static contact 1, the movable contact 4 is fixed on the upper part of the push rod 11, and the switch The movable contact 8 is arranged at the bottom of the lower cavity, the operating part 3 is a cylinder with an open upper end, the bottom plate of the operating part 3 is fixed on the middle part of the switch movable contact 8 with fasteners 7, and the bottom of the push rod 11 is Extending into the operation part 3, the bottom of the ejector rod 11 is provided with a hollow part 5, the top of the switch movable contact 8 is inserted into the hollow part 5 and slidably connected with the ejector rod 11, the inner wall of the lower cavity of the housing 2 The first groove 9 and the second groove 10 are arranged symmetrically on both sides, the first groove 9 is located on the upper part of the second groove 10, the lower side of the first groove 9 and the second groove 10 are connected with the push rod 11 is perpendicular to the axis, and the angle between the upper side of the second groove 10 and the axis of the ejector rod 11 is an acute angle. The telescopic pin 6 includes two supporting parts 61 and an elastic telescopic element 62 connecting the two supporting parts 61. The supporting parts The lower side of the outer end of 61 is perpendicular to the axis of the ejector rod 11, the angle between the upper side of the outer end of the support part 61 and the ejector rod 11 is an acute angle, the lower part of the ejector rod 11 is provided with a slideway, and the slideway and the ejector rod 11 The axis is vertical, the telescopic pin 6 is arranged in the slideway, through holes are symmetrically arranged on the side of the operation part 3 , and the support parts 61 at both ends of the telescopic pin 6 protrude from the through holes.

When working, when the switch movable contact 8 moves upward, the upper part of the switch movable contact 8 slides upward in the hollowed out part 5 until the upper end surface of the switch movable contact 8 touches the bottom of the hollowed out part 5, and the switch movable contact 8 continues upward Move and push the ejector rod 11 to move upward until the movable contact 4 contacts the static contact 1, and at the same time, the elastic elastic element 62 stretches and pushes the supporting parts 61 at both ends to extend into the first groove 9. At this time, the lower side of the outer end of the supporting part 61 contact with the lower side of the first groove 9, and the upper surface of the through hole on the side of the operation part 3 does not contact the upper side of the outer end of the support part 61. At this time, the current flows through the switch movable contact 8, the top The rod 11, the moving contact 4 and the static contact 1 are electrically connected.

When the switch movable contact 8 moves downward, the operating part 3 moves downward under the drive of the switch movable contact 8 until the upper side of the through hole on the side of the operating part 3 is in contact with the supporting part 61. The upper side of the outer end contacts, at this time the switch movable contact 8 continues to move downward, the upper side of the through hole presses the upper side of the outer end of the support part 61, and the elastic telescopic element 62 is compressed when the support part 61 is pressed shorten until the outer end of the support part 61 breaks away from the lower side of the first groove 9, then the outer end of the support part 61 slides into the upper side of the second groove 10, at this time the moving contact 4 is separated from the static contact 1, and the circuit interrupt, and then the switch movable contact 8 continues to move downward, and the outer end of the support part 61 moves downward along the upper side of the second groove 10, and at the same time, the elastic stretchable element 62 is gradually extended. When the bottom surface of the cavity is in contact, the lower side of the outer end of the support portion 61 is in contact with the lower side of the second groove 10 .

Claims (2)

1. A vacuum circuit breaker, characterized in that it includes a housing (2) with a cavity inside, a static contact (1), a moving contact (4), a switch moving contact (8), an operating part ( 3), telescopic pin (6) and ejector rod (11), the casing (2) is provided with a partition inside, and the partition divides the cavity into an upper cavity and a lower cavity, and the partition is set There is a guide hole, the upper end of the ejector rod (11) is inserted into the guide hole, the static contact (1) is set on the top of the upper cavity, and the moving contact (4) is set below the static contact (1) , the movable contact (4) is fixed on the upper part of the push rod (11), the switch movable contact (8) is arranged at the bottom of the lower cavity, the operating part (3) is a cylinder with an open upper end, and the operation The bottom plate of the part (3) is fixed in the middle of the switch moving contact (8), the bottom of the push rod (11) extends into the operation part (3), and the bottom of the push rod (11) is provided with a hollow part ( 5), the top of the switch movable contact (8) is inserted into the hollow part (5) and slidingly connected with the ejector rod (11), and the first grooves are symmetrically arranged on both sides of the inner wall of the lower cavity of the housing (2) (9) and the second groove (10), the first groove (9) is located on the upper part of the second groove (10), and the lower sides of the first groove (9) and the second groove (10) are connected with The axis of the ejector rod (11) is vertical, the angle between the upper side of the second groove (10) and the axis of the ejector rod (11) is an acute angle, and the telescopic pin (6) includes two support parts (61) and a The elastic telescopic element (62) of the part (61), the lower side of the outer end of the support part (61) is perpendicular to the axis of the ejector rod (11), and the upper side of the outer end of the support part (61) is perpendicular to the axis of the ejector rod (11) The included angle is an acute angle, and the lower part of the ejector rod (11) is provided with a slideway, the slideway is perpendicular to the axis of the ejector rod (11), the telescopic pin (6) is arranged in the slideway, and the operating part (3) Through holes are symmetrically arranged on the side, and the support parts (61) at both ends of the telescopic pin (6) protrude from the through holes. When the moving contact (4) contacts the static contact (1), the switch moves The upper end surface of the contact (8) is in contact with the bottom of the hollow part (5), the supporting parts (61) at both ends of the telescopic pin (6) extend into the first groove (9), and the lower side of the outer end of the supporting part (61) Contact with the lower side of the first groove (9), when the movable contact (4) is separated from the static contact (1), the upper end surface of the switch movable contact (8) is separated from the bottom of the hollow part (5), and the operation The bottom surface of the part (3) is in contact with the bottom surface of the lower cavity of the housing (2), the lower side of the outer end of the support part (61) is in contact with the lower side of the second groove (10), and the through hole on the side of the operating part (3) The upper surface is in contact with the upper side of the outer end of the support part (61). 2. The vacuum circuit breaker according to claim 1, characterized in that: the elastic telescopic element (62) is a coil spring.