阅读说明：本技术 真空断路器 (Vacuum circuit breaker ) 是由 李永林 李旭旭 刘庆 毕迎华 卢彦辉 韩桂全 韩国辉 王铭飞 庞素敏 庞建 于 2018-07-12 设计创作，主要内容包括：本发明涉及一种真空断路器。该真空断路器包括动端导电杆和导电支撑筒,所述导电支撑筒内设有弹簧筒,所述弹簧筒内设有弹簧,弹簧筒靠近动端导电杆的一端具有筒底,筒底上设有供动端导电杆穿过的通孔,动端导电杆穿过通孔伸入弹簧筒内,动端导电杆上设有与弹簧筒的筒底沿轴向挡止配合的挡止结构,动端导电杆伸入弹簧筒的一端通过螺母将弹簧筒顶压到挡止结构上。该真空断路器优化了弹簧筒与动端导电杆的连接方式,不需要专用的扳手,只需要通过套管扳手将螺母与动端导电杆伸入弹簧筒的一端连接即可实现弹簧筒与动端导电杆的相对固定,降低了装配难度,提高了装配效率。(The present invention relates to a vacuum circuit breaker. The vacuum circuit breaker comprises a movable end conducting rod and a conductive supporting cylinder, wherein a spring cylinder is arranged in the conductive supporting cylinder, a spring is arranged in the spring cylinder, a cylinder bottom is arranged at one end, close to the movable end conducting rod, of the spring cylinder, a through hole for the movable end conducting rod to penetrate through is formed in the cylinder bottom, the movable end conducting rod penetrates through the through hole and extends into the spring cylinder, a blocking structure matched with the cylinder bottom of the spring cylinder in an axial blocking mode is arranged on the movable end conducting rod, and one end, extending into the spring cylinder, of the movable end conducting rod presses the spring cylinder to the blocking structure through a nut. This vacuum circuit breaker has optimized the connected mode of spring case with move the end conducting rod, does not need dedicated spanner, only needs to stretch into the one end of spring case with nut and moving the end conducting rod through the sleeve pipe spanner and is connected the relatively fixed that can realize spring case and move the end conducting rod, has reduced the assembly degree of difficulty, has improved assembly efficiency.)

1. Vacuum circuit breaker, including moving end conducting rod and electrically conductive a support section of thick bamboo, be equipped with the spring case in the electrically conductive support section of thick bamboo, be equipped with spring, its characterized in that in the spring case: the end, close to the movable end conducting rod, of the spring barrel is provided with a barrel bottom, a through hole for the movable end conducting rod to penetrate through is formed in the barrel bottom, the movable end conducting rod penetrates through the through hole and extends into the spring barrel, a blocking structure matched with the barrel bottom of the spring barrel in an axial blocking mode is arranged on the movable end conducting rod, and one end, extending into the spring barrel, of the movable end conducting rod presses the spring barrel to the blocking structure through a nut.

2. Vacuum interrupter according to claim 1, characterized in that: the stop structure comprises a ring platform arranged on the movable end conductive rod and a contact seat sleeved on the movable end conductive rod, and the contact seat is fixed on the ring platform in a compression joint mode through a spring barrel.

3. Vacuum interrupter according to claim 1, characterized in that: the outer peripheral surface of the spring barrel is provided with a long hole extending along the axial direction of the spring barrel.

4. Vacuum interrupter according to claim 1, 2 or 3, characterized in that: the bottom of the spring cylinder is provided with an annular boss which is parallel to the axis of the spring cylinder and protrudes into the spring cylinder, and the spring is sleeved on the annular boss.

5. Vacuum interrupter according to claim 1, 2 or 3, characterized in that: the spring barrel is internally provided with a joint which is used for being in transmission connection with the insulating pull rod, the joint is provided with a stopping step which is used for pressing the spring to the barrel bottom of the spring barrel, and one end of the spring barrel, which is far away from the barrel bottom, is provided with a stopping piece which is matched with the stopping step in an axial stopping way.

6. Vacuum interrupter according to claim 5, characterized in that: and a gap is arranged between the joint and the movable end conducting rod.

7. Vacuum interrupter according to claim 5, characterized in that: the joint is of a round shaft structure, one end, far away from the bottom of the spring barrel, of the spring is sleeved on the joint, and the stopping step is formed by a shaft shoulder arranged on the joint.

8. Vacuum interrupter according to claim 5, characterized in that: the stopping piece is a nut which is connected to the spring barrel through threads, a guide hole for guiding and assembling the connector is formed in the nut, and a guide ring is arranged on the hole wall of the guide hole.

9. Vacuum interrupter according to claim 1, 2 or 3, characterized in that: the spring cylinder is guided and assembled in the conductive supporting cylinder.

10. Vacuum interrupter according to claim 9, characterized in that: the contact seat is provided with a groove, the bottom of the spring cylinder is assembled in the groove, and one end of the spring cylinder, which is far away from the bottom of the spring cylinder, is in guide fit with the inner wall of the conductive support cylinder.

Technical Field

The present invention relates to a vacuum circuit breaker.

Background

At present, a vacuum circuit breaker takes vacuum as an arc extinguishing medium and an insulating medium between contacts after arc extinguishing, has the advantages of small volume, light weight, suitability for frequent operation and difficulty in maintenance of arc extinguishing, and is popularized in a power distribution network. In the actual structure of the vacuum circuit breaker, the moving contact and the static contact generally adopt a butt-joint type contact mode, and when the vacuum arc-extinguishing chamber is in a working state, most of the contact closing maintaining springs provide contact pressure for the moving contact and the static contact, so that good electric contact is maintained between the moving contact and the static contact. In order to ensure that the moving contact has enough force to resist the electrodynamic force and not repel when the moving contact is not contacted with the static contact and is subjected to pre-breakdown in the closing process, even if the vacuum circuit breaker is positioned at the opening position, the contact closing holding spring is designed with a certain pre-compression amount, namely a pre-compression force; the contact pressure between the contacts is gradually increased along with the advance of the contact stroke, when the contact stroke is ended, the contact pressure reaches a preset value, and when the movable contact and the fixed contact are in contact, the contact pressure is suddenly increased to a pre-pressure value, so that the electric repulsion is resisted, the contact is in a good state initially, and the switching-on bounce is prevented.

Chinese patent No. CN206331960U, published as 2017.07.14, discloses an indoor handcart type heavy current circuit breaker with chimney effect, which includes an insulating cylinder and a vacuum arc-extinguishing chamber, wherein a moving end conducting rod with a moving end contact is arranged in the vacuum arc-extinguishing chamber, and the moving end conducting rod is connected with a disk spring rod driving device, so as to ensure the reliability of electrical connection. However, due to the structural limitation of the vacuum arc extinguish chamber of the circuit breaker, the driving disc spring rod and the movable end conducting rod are inconvenient to connect, and the assembly efficiency is low.

Chinese patent with publication number CN104064397B and publication date 2018.01.05 discloses a waist-supported rotary type voltage-sharing belt grounding shielding high-voltage vacuum arc-extinguishing chamber solid-sealed polar pole, which comprises a conductive seat, a vacuum arc-extinguishing chamber, a conductive cylinder, a rotary movable contact finger, a sliding spring contact finger and a direct-acting disc spring cylinder combined rod piece, wherein the direct-acting disc spring combined rod piece is arranged inside the conductive cylinder and is fixedly connected with the movable conductive rod of the vacuum arc-extinguishing chamber. However, when the direct-acting disc spring combined rod piece is fixedly connected with the movable conducting rod of the vacuum arc-extinguishing chamber, a special wrench is needed, the assembly is inconvenient, and the assembly efficiency is low.

Disclosure of Invention

The invention aims to provide a vacuum circuit breaker, which solves the problems that in the prior art, a contact closing maintaining spring of the vacuum circuit breaker is inconvenient to assemble and low in assembling efficiency.

In order to achieve the purpose, the technical scheme of the vacuum circuit breaker is as follows: the vacuum circuit breaker comprises a movable end conducting rod and a conductive supporting cylinder, wherein a spring cylinder is arranged in the conductive supporting cylinder, a spring is arranged in the spring cylinder, a cylinder bottom is arranged at one end, close to the movable end conducting rod, of the spring cylinder, a through hole for the movable end conducting rod to penetrate through is formed in the cylinder bottom, the movable end conducting rod penetrates through the through hole and extends into the spring cylinder, a blocking structure matched with the cylinder bottom of the spring cylinder in an axial blocking mode is arranged on the movable end conducting rod, and one end, extending into the spring cylinder, of the movable end conducting rod presses the spring cylinder to the blocking structure through a nut.

The beneficial effects are as follows: according to the vacuum circuit breaker, on the basis that the contact pressure is provided for the moving contact and the static contact and the stable contact of the moving contact and the static contact is guaranteed when the vacuum arc extinguish chamber is in the working state, the connection mode of the spring cylinder and the moving end conducting rod is optimized, a special wrench is not needed, and the spring cylinder and the moving end conducting rod can be fixedly connected only by connecting the nut and the end, extending into the spring cylinder, of the moving end conducting rod through the sleeve wrench, so that the assembly difficulty is reduced, and the assembly efficiency is improved.

The stop structure comprises a ring platform arranged on the movable end conductive rod and a contact seat sleeved on the movable end conductive rod, and the contact seat is fixed on the ring platform in a compression joint mode through a spring barrel.

The outer peripheral surface of the spring barrel is provided with a long hole extending along the axial direction of the spring barrel.

The beneficial effects are as follows: in the assembling process, the arrangement of the strip holes is convenient for operators to observe the connection condition of the nuts.

The bottom of the spring cylinder is provided with an annular boss which is parallel to the axis of the spring cylinder and protrudes into the spring cylinder, and the spring is sleeved on the annular boss.

The beneficial effects are as follows: the bottom of the spring cylinder is provided with an annular boss which is parallel to the axis of the spring cylinder and protrudes into the spring cylinder, the annular boss is sleeved with the spring, and the annular boss has a guiding effect on the spring, so that the compression force generated by the spring in the compression process is always parallel to the movement direction of the movable end conducting rod.

The spring barrel is internally provided with a joint which is used for being in transmission connection with the insulating pull rod, the joint is provided with a stopping step which is used for pressing the spring to the barrel bottom of the spring barrel, and one end of the spring barrel, which is far away from the barrel bottom, is provided with a stopping piece which is matched with the stopping step in an axial stopping way.

And a gap is arranged between the joint and the movable end conducting rod.

The joint is of a round shaft structure, one end, far away from the bottom of the spring barrel, of the spring is sleeved on the joint, and the stopping step is formed by a shaft shoulder arranged on the joint.

The beneficial effects are as follows: the stopping step is formed by a shaft shoulder arranged on the joint, and the joint plays a role in guiding the spring, so that the compression force generated by the spring in the compression process is always parallel to the motion direction of the movable end conducting rod.

The stopping piece is a nut which is connected to the spring barrel through threads, a guide hole for guiding and assembling the connector is formed in the nut, and a guide ring is arranged on the hole wall of the guide hole.

The spring cylinder is guided and assembled in the conductive supporting cylinder.

The beneficial effects are as follows: in the process of switching on and off the vacuum circuit breaker, the spring cylinder cannot shake, and the stability of switching on and off the vacuum circuit breaker is ensured.

The contact seat is provided with a groove, the bottom of the spring cylinder is assembled in the groove, and one end of the spring cylinder, which is far away from the bottom of the spring cylinder, is in guide fit with the inner wall of the conductive support cylinder.

The beneficial effects are as follows: the assembly mode only needs to ensure the assembly precision of one end of the spring cylinder far away from the cylinder bottom and the conductive support cylinder, and the processing difficulty of the spring cylinder is reduced.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 of a vacuum circuit breaker of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

fig. 3 is a schematic structural view of embodiment 2 of the vacuum circuit breaker of the present invention.

Description of reference numerals: 1. a vacuum arc-extinguishing chamber; 2. a conductive contact finger; 3. a guide ring; 4. a conductive support cylinder; 5. an insulating pull rod; 6. a contact seat; 7. a movable end conducting rod; 8. a shaft shoulder; 9. a nut; 10. a spring case; 11. a spring; 12. a nut; 13. a joint; 14. an annular flange.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

Embodiment 1 of the vacuum circuit breaker of the present invention, as shown in fig. 1 to 2, the vacuum circuit breaker includes a vacuum arc-extinguishing chamber 1, a moving end conductive rod 7 with a moving contact, a stationary end conductive rod with a stationary contact, a conductive support cylinder 4 and an insulating pull rod 5, a contact base 6 is installed in the conductive support cylinder 4 in a guiding manner, a conductive contact finger 2 is installed between the contact base 6 and the conductive support cylinder 4, the conductive contact finger 2 plays a conductive role, an annular groove is installed on a contact surface of the contact base 6 and the conductive support cylinder 4, and a guide ring 3 is installed in the annular groove.

In this embodiment, the conductive support tube 4 includes a spring assembly, the spring assembly includes a spring tube 10 and a spring 11 disposed in the spring tube, one end of the spring tube close to the movable end conductive rod 7 has a tube bottom, a through hole for the movable end conductive rod 7 to pass through is disposed on the tube bottom, the movable end conductive rod 7 passes through the through hole and extends into the spring tube 10, a stop structure is disposed on the movable end conductive rod 7 and axially stops the tube bottom of the spring tube 10, one end of the movable end conductive rod 7 extending into the spring tube 10 presses the spring tube 10 against the stop structure through a nut, and a gasket is disposed on a pressure contact surface between the nut 9 and the spring tube 10. The stopping structure comprises a ring platform arranged on the movable end conducting rod 7 and a contact seat 6 sleeved on the movable end conducting rod 7, and the contact seat 6 is pressed and fixed on the ring platform by a spring barrel 10.

In this embodiment, an annular boss protruding into the spring barrel 10 in parallel with the axis of the spring barrel 10 is disposed on the barrel bottom of the spring barrel 10, and the spring 11 is sleeved on the annular boss. The outer peripheral surface of the spring case 10 is provided with elongated holes at intervals along the circumferential direction of the spring case 10.

In this embodiment, a joint 13 connected to the insulating rod 5 in a driving manner is disposed in the spring barrel 10, the joint 13 is provided with a stopping step for pressing the spring 11 against the barrel bottom of the spring barrel 10, and a stopping member axially matched with the stopping step is disposed at an end of the spring barrel 10 away from the barrel bottom. The joint 13 is a round shaft structure, and one end of the spring 11, which is far away from the movable end conducting rod 7, is sleeved on the joint 13. The stop step is formed by a shoulder 8 provided on the joint 13. The stopping piece is a nut 12 connected to the spring barrel 10 through threads, a guide hole for guiding and assembling the joint 13 is formed in the nut 12, an annular groove is formed in the hole wall of the guide hole, and a guide ring 3 is installed in the annular groove.

In this embodiment, the spring cylinder 10 is assembled in the conductive support cylinder 4 in a guiding manner, a groove is formed in the contact seat 6, the cylinder bottom of the spring cylinder 10 is assembled in the groove, one end, far away from the cylinder bottom, of the spring cylinder 10 is matched with the inner wall of the conductive support cylinder 4 in a guiding manner, an annular groove is formed in the contact surface of the spring cylinder 10 and the conductive support cylinder 4, and the guide ring 3 is installed in the annular groove.

When the contact closing maintaining spring assembly of the vacuum circuit breaker is assembled, one end, far away from a moving contact, of a moving end conducting rod 7 extends into a spring barrel, the barrel bottom of the spring barrel 10 is assembled in a groove of a contact seat 6, a nut 9 and the end, far away from the moving contact, of the moving end conducting rod 7 are connected through threads of the end, far away from the moving contact, of the spring barrel 10 through a sleeve spanner, the contact seat 6 is fixed on a ring platform of the moving end conducting rod 7 in a pressing mode, a spring 11 is installed into the spring barrel 10 and sleeved on the ring platform, a connector 13 is installed into the spring barrel 10, one end, far away from the barrel bottom, of the spring is sleeved on the connector 13 and is in contact with a shaft shoulder 8 of the connector 13, then one end, far away from the barrel bottom, of the spring barrel 10 is connected with a nut 12 through threads, and an insulating pull rod 5 is.

When the vacuum arc-extinguishing chamber 1 of the vacuum circuit breaker works, the insulating pull rod 5 pushes the joint 13 to move, the joint 13 compresses the spring 11 in the spring cylinder 10, the spring 11 has certain pressure on the cylinder bottom of the spring cylinder 10 after being stressed, because the cylinder bottom of the spring cylinder 10 is assembled in the groove on the contact seat 6, the pressure at the end part of the spring cylinder 10 is transmitted to the contact seat 6 and drives the movable end conducting rod 7 to move, along with the advance of the movable end conducting rod 7, the contact pressure between the movable contact and the fixed contact is gradually increased, when the movable contact on the movable end conducting rod 7 is in contact with the fixed contact on the fixed end conducting rod, the contact pressure is suddenly increased to a preset pressure value, the contact pressure makes the movable contact and the fixed contact have a good contact state at the beginning, and the contact pressure is enough to resist the electric repulsion force, so that the switch-on.

Embodiment 2 of the vacuum circuit breaker of the present invention is different from embodiment 1 in that, as shown in fig. 3, a stopper step is formed by an annular flange 14 provided radially outside one end of a joint 13.

Embodiment 3 of the vacuum circuit breaker of the present invention is different from embodiment 1 in that the stopper is a flange fixed to the end face of the spring case 10 by a screw.