CN203733702U - Novel high voltage vacuum circuit breaker contact spring transmission device with high reliability - Google Patents

Abstract

A novel high voltage vacuum circuit breaker contact spring transmission device with high reliability comprises a transmission guide rod, a precompression atresia guide rod and a guide sleeve rod, wherein the precompression atresia guide rod is fixedly connected to the transmission guide rod; the guide sleeve rod sleeves an external portion of the precompression atresia guide rod, is slidingly cooperated with the precompression atresia guide rod and carries out limiting and guiding on the precompression atresia guide rod. The transmission guide rod is fixed to one end of the guide sleeve rod and a spring is fixed to the other end. The other end of the spring is fixed to the transmission guide rod or the precompression atresia guide rod. When a circuit breaker is in a closing state, the contact spring transmission device of the utility model provides circuit-breaker rated overtravel and rated contact end pressure. When the circuit breaker is an opening state, the contact spring transmission device provides a circuit breaker contact spring precompression amount. On an aspect of the structure, a pin structure which is widely used by the contact spring transmission device is abandoned so that mechanical reliability can be greatly increased.

Description

A New High Reliability Contact Spring Drive Device for High Voltage Vacuum Circuit Breaker

technical field

The utility model belongs to the technical field of high-voltage vacuum circuit breakers, in particular to a high-reliability novel high-voltage vacuum circuit breaker contact spring transmission device.

Background technique

In high-voltage vacuum circuit breakers, contact spring transmission devices are widely used, the purpose of which is to improve the phenomenon of contact collision and bouncing during the closing process of the circuit breaker, and to provide its rated contacts when the circuit breaker is in the closing state. Compression force. At present, the structural form of the contact spring transmission device of the domestic high-voltage vacuum circuit breaker is widely used as the pin shaft structure, that is, the contact spring transmission device with the pin shaft structure provides a higher contact initial pressing force of the vacuum circuit breaker. During the opening process of the circuit breaker, when the contact spring releases the over-travel compression, the pin bearing is affected by the impact force, resulting in the pin shaft being prone to displacement and fatigue fracture after repeated opening and closing operations of the circuit breaker. and so on, and cause the circuit breaker to fail to operate.

Contents of the invention

In order to solve the problems existing in the above-mentioned prior art, the purpose of this utility model is to provide a new high-reliability high-voltage vacuum circuit breaker contact spring transmission device, which cancels the pin structure widely used in the contact spring transmission device in structure , can significantly improve its mechanical reliability.

In order to achieve the above object, the utility model adopts the following technical solutions:

A new high-reliability high-voltage vacuum circuit breaker contact spring transmission device, including a transmission guide rod 1, a pre-compression locking guide rod 3 fixedly connected to the transmission guide rod 1, sleeved on the outside of the pre-compression locking guide rod 3 and a pre-compression locking guide rod 3. The guide rod 4 that compresses and locks the guide rod 3 slidingly fits and limits and guides it. One end of the guide sleeve rod 4 is fixed with a transmission guide rod 5, and the other end is fixed with a spring 2. The other end of the spring 2 is fixed on the transmission Guide rod 1 or pre-compression locking guide rod 3.

Spring cover plates 6 are arranged at the upper end and the lower end of the spring 2 .

The transmission guide rod 1 and the pre-compression locking guide rod 3 are connected by threads.

The guide sleeve rod 4 and the transmission guide rod 5 are threadedly connected.

Compared with the prior art, the utility model has the following advantages:

1. The pin shaft structure widely used in the contact spring transmission device is canceled, which significantly improves the reliability of the high-voltage vacuum circuit breaker. The contact spring transmission device avoids the displacement and fatigue fracture of the pin shaft after multiple operations of the circuit breaker due to the high spring preload and the collision force on the pin bearing at the moment when the contact is just opened during the opening process of the circuit breaker. This in turn causes the circuit breaker to fail to operate.

2. It is easy to install and maintain. The transmission guide rod 1 and the pre-compression locking guide rod 3 are fixedly connected, the guide sleeve rod 4 is fixedly connected to the transmission guide rod 5, and the pre-compression locking guide rod 3 is in sliding contact with the guide sleeve rod 4. This structure is convenient installation, and when the device fails internally, it is easy to disassemble and maintain.

Description of drawings

Fig. 1 is a structural schematic diagram of a new high-reliability high-voltage vacuum circuit breaker contact spring transmission device of the utility model.

Fig. 2 is a schematic diagram of the fixed connection mode of the transmission guide rod and the pre-compression locking guide rod of the utility model.

Fig. 3 is a schematic diagram of the fixed connection mode between the guide sleeve rod and the transmission guide rod of the present invention.

Fig. 4 is a schematic diagram of the movement of the high-reliability new high-voltage vacuum circuit breaker contact spring drive device of the utility model during the opening and closing operation of the circuit breaker.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figure 1, the utility model is a high-reliability new high-voltage vacuum circuit breaker contact spring transmission device, including a transmission guide rod 1, and a pre-compression locking guide rod 3 fixedly connected to the transmission guide rod 1, which is sleeved on the The outside of the pre-compression locking guide rod 3 is slidably matched with the pre-compression locking guide rod 3 and the guide sleeve rod 4 is used to limit and guide it. One end of the guide sleeve rod 4 is fixed with a transmission guide rod 5, and the other end is fixed with a spring 2 , the other end of the spring 2 is fixed on the transmission guide rod 1 or the pre-compression locking guide rod 3 .

As a preferred embodiment of the present invention, in order to better fix the spring 2 , spring cover plates 6 are provided at the upper end and the lower end of the spring 2 . The spring cover 6 can simultaneously apply a preload to the spring 2 .

As shown in FIG. 2 , as a preferred embodiment of the present invention, the transmission guide rod 1 and the pre-compression locking guide rod 3 are connected by threads. As shown in Figure 2a, there is an internal thread blind hole on the transmission guide rod 1, and an external thread on the pre-compression locking guide rod 3, and the two are connected through thread fit; as shown in Figure 2b, the pre-compression locking guide rod 3 has an internal thread through hole, and the transmission guide rod 1 has an external thread, and the two are connected through thread fit; as shown in Figure 2c, an internal thread blind hole is opened on the pre-compression locking guide rod 3, and the transmission guide rod 1 1 has an external thread, and the two are connected by threaded fit. Of course, the transmission guide rod 1 and the pre-compression locking guide rod 3 can also adopt other fixed connection methods, and the fixing method can adopt nut fastening or other fixed connection methods. Or other fixing methods to facilitate installation, such as symmetrical slots or hexagonal structures on the side.

As shown in FIG. 3 , as a preferred embodiment of the present invention, the guide sleeve rod 4 and the transmission guide rod 5 are connected by threads. As shown in Figure 3a, there are threads around the inner hole of the guide sleeve rod 4, and there are external threads on the transmission guide rod 5, and the two are connected by thread fit; as shown in Figure 3b, there is a thread on the transmission guide rod 5 The internal thread blind hole and the guide sleeve rod 4 have external threads, and the two are connected through thread fit. Of course, the guide sleeve rod 4 and the transmission guide rod 5 can also adopt other fixed connection methods, and the fixing method can adopt nut fastening or other fixed connection methods. Screw fixing or other fixing methods are convenient for installation, such as symmetrical slotting or hexagonal structure on the side.

The pre-compression locking guide rod 3 and the guide sleeve rod 4 adopt a sliding connection with the function of limiting and guiding: the pre-compression locking guide rod 3 and the guide sleeve rod 4 adopt tolerance matching that meets the relative sliding and guiding functions; the sliding contact surface can be added Oil-free shaft sleeve components or other relative sliding components that meet the requirements of the guiding function adopt the technology that meets the requirements of relative sliding to ensure the smoothness of the sliding contact surface and other technical requirements.

The working principle of the utility model is as follows: as shown in Figure 3, the spring 2 works together with the transmission guide rod 1, the pre-compression locking guide rod 3, the guide sleeve rod 4, the transmission guide rod 5 and the spring cover plate 6 to provide a contactor for the vacuum circuit breaker. Head pre-pressure and closing overtravel: the upper end of the transmission guide rod 1 is connected with the moving conductive rod of the high-voltage vacuum interrupter, and the lower end of the transmission guide rod 5 is connected with the circuit breaker transmission linkage assembly. When the circuit breaker performs the closing operation, the contact spring transmission device of the utility model moves upward as a whole under the action of the closing driving force of the mechanism. When the moving stroke of the moving contact reaches the contact opening distance _d1 , the moving and static contacts of the circuit breaker Contact, the transmission guide rod 1 and the pre-compression locking guide rod 3 stop moving, the guide sleeve rod 4 and the transmission guide rod 5 continue to move upward until the spring 2 is compressed to the overtravel d ₂ , and the closing process ends; when the circuit breaker When performing the opening operation, the spring 2 releases the overtravel compression amount d ₂ , and the guide sleeve rod 4 and the transmission guide rod 5 move downward under the force of the spring 2 and the mechanism opening driving force. When the compression amount released by the spring 2 reaches the overtravel d At ₂ o'clock, the moving and static contacts of the circuit breaker are separated, and the guide sleeve rod 4 collides with the pre-compressed locking guide rod 3 and moves downward together with the guide sleeve rod _1. When the movement stroke of the moving contact reaches the contact opening distance d1 , the contact spring transmission device stops moving, and the opening process ends. From the above working process, it can be seen that: when the circuit breaker is in the closing state, the utility model contact spring transmission device provides the rated overtravel of the circuit breaker and the rated contact end pressure; when the circuit breaker is in the opening state, the contact The spring drive device provides the pre-compression of the circuit breaker contact spring.

Claims (4)

1. the high-tension Vacuum switch contact spring transmission device of a high reliability, it is characterized in that: comprise transmission guide rod (1), the precommpression locking guide rod (3) being fixedly connected with transmission guide rod (1), be socketed in that precommpression locking guide rod (3) is outside and precommpression locking guide rod (3) is slidably matched and it is carried out to guiding loop bar (4) spacing and that lead, one end at guiding loop bar (4) is fixed with transmission guide rod (5), the other end is fixed with spring (2), and the other end of spring (2) is fixed on transmission guide rod (1) or precommpression locking guide rod (3).

2. the high-tension Vacuum switch contact spring transmission device of a kind of high reliability according to claim 1, is characterized in that: be provided with spring bumper cover (6) in the top and bottom of described spring (2).

3. the high-tension Vacuum switch contact spring transmission device of a kind of high reliability according to claim 1, is characterized in that: described transmission guide rod (1) and precommpression locking guide rod (3) adopt and be threaded.

4. the high-tension Vacuum switch contact spring transmission device of a kind of high reliability according to claim 1, is characterized in that: described guiding loop bar (4) and transmission guide rod (5) adopt and be threaded.