CN201838507U - Vacuum circuit breaker and tripping cushioning device thereof - Google Patents

Abstract

The utility model discloses a switch-off buffer device for a vacuum circuit breaker, which comprises a contact spring device used for transmission connection with a transmission rod of a moving contact. The connecting piston rod is provided with a buffer device connected with the piston rod of the contact spring device under the contact spring device. When the vacuum circuit breaker of the utility model is working with the opening buffer device, the buffer device is arranged under the contact spring device, and the buffer device directly acts on the movable contact through the contact spring device. When the vacuum circuit breaker is in the opening operation, compared with the original design of the contact spring device, the inner crank arm, the transmission shaft and the outer crank arm, the existing opening buffer device has a simple structure and a good buffering effect. Parts such as outer crank arms and rollers are omitted, which saves production costs, and because of fewer parts, the assembly efficiency is improved, and the failure rate of the opening buffer device is also reduced.

Description

A vacuum circuit breaker and its opening buffer device

technical field

The utility model relates to the field of vacuum circuit breakers, in particular to an opening buffer device for vacuum circuit breakers.

Background technique

As shown in Figure 1 and Figure 2, the opening and buffering devices for vacuum circuit breakers on the market are currently on the market. In the single-stage transmission structure 4 of the vacuum circuit breaker, buffer devices 3 such as oil buffers or rubber pad buffers are fixed on the single-stage transmission Below the outer crank arm 1 of the shaft, the roller 2 set at the end of the outer crank arm 1 at the end of the opening stage of the vacuum circuit breaker just hits the buffer device 3, and the buffer device 3 acts as a buffer for the moving contact and the contact spring device 5. The single-stage casing 5 is equipped with a transmission rod 9 connected to the moving contact, and an inner crank arm 8 is fixedly connected to the transmission shaft. The inner swing arm 8 is connected to the transmission rod 9 of the moving contact through the contact spring device 7 , the buffer device 3 such as oil buffer or rubber cushion buffer buffers the moving contact through the outer crank arm 1, the transmission shaft, the inner crank arm 8, and then the contact spring device 7. When this buffer method is applied at a high voltage level At this time, due to the large operating power and high opening speed, although the transmission shaft and the inner crank arm act on the buffer device through the outer crank arm to decelerate and limit the position, the moving contact often compresses the contact spring due to excessive kinetic energy. Impact and rebound, thereby affecting the normal operation of the vacuum circuit breaker, and causing damage to the transmission parts in the contact spring device, affecting the service life of the transmission parts.

Utility model content

The purpose of this utility model is to provide a vacuum circuit breaker to solve the technical problem in the prior art that the moving contact of the vacuum circuit breaker is prone to overshoot and rebound at the end of the gate opening; at the same time, the utility model also provides Corresponding opening buffer device.

The technical solution of the opening and buffering device for vacuum circuit breaker provided by the utility model is: an opening and buffering device for vacuum circuit breaker, including a contact spring device for transmission connection with the transmission rod of the moving contact, the contact spring The device includes a piston rod whose upper end is used for transmission connection with the transmission rod of the movable contact, and a buffer device is arranged under the contact spring device for transmission connection with the piston rod of the contact spring device.

The lower end of the piston rod of the contact spring device is slidingly sleeved with a cylindrical piston joint that is provided with a mounting hole for matching with the piston rod at the bottom of the upper cylinder. A suitable shaft shoulder, the upper end surface of which is used to press fit with the downward end surface of the upper cylinder bottom of the piston joint, and a lower end cover is slidingly sleeved on the lower part of the piston rod, and the lower end surface of the lower end cover is in contact with the The upward facing end surface of the upper cylinder bottom of the piston joint is press-fitted, and an upper end cover is adjustable and fixed on the upper part of the piston rod, and a spring assembly is sleeved on the piston rod between the upper and lower end covers, The spring assembly is press-fitted with the corresponding end faces of the upper and lower end covers, and a slotted hole is provided on the corresponding section of the piston rod and the piston joint, and a slot for connecting with the driving crank arm is slidably fitted in the slotted hole. For the pin shaft of transmission connection, a mounting hole for installing the pin shaft is provided on the cylinder wall of the piston joint corresponding to the long slot hole, and a buffer device is fixed below the piston joint at the lower end of the piston rod.

The upper end cover is adjustable and fixed on the piston rod through threads.

The buffer device is an oil buffer, and a piston connected with the piston rod is arranged in the oil buffer, and the shell of the oil buffer is fixedly arranged under the contact spring device.

The buffer device is a rubber pad buffer.

When the vacuum circuit breaker of the utility model is working with the opening buffer device, the buffer device is arranged under the contact spring device, and the buffer device directly acts on the movable contact through the contact spring device. When the vacuum circuit breaker is opened, compared with the original design of the contact spring device, the inner lever, the transmission shaft and the outer lever, the existing buffer device has a simple structure and a good buffer effect. Parts such as outer crank arms and rollers are omitted, which saves production costs, and because of fewer parts, the assembly efficiency is improved, and the failure rate of the opening buffer device is also reduced.

The technical solution of the vacuum circuit breaker provided by the utility model is: a vacuum circuit breaker, which includes a driving crank arm and an opening and buffering device connected by the driving crank. The contact spring device connected to the transmission rod, the contact spring device includes a piston rod at the upper end for transmission connection with the transmission rod of the moving contact, and a piston connected to the contact spring device is arranged below the contact spring device. Cushioning device for rod drive connection.

The lower end of the piston rod of the contact spring device is slidingly sleeved with a cylindrical piston joint that is provided with a mounting hole for matching with the piston rod at the bottom of the upper cylinder. A suitable shaft shoulder, the upper end surface of which is used to press fit with the downward end surface of the upper cylinder bottom of the piston joint, and a lower end cover is slidingly sleeved on the lower part of the piston rod, and the lower end surface of the lower end cover is in contact with the The upward facing end surface of the upper cylinder bottom of the piston joint is press-fitted, and an upper end cover is adjustable and fixed on the upper part of the piston rod, and a spring assembly is sleeved on the piston rod between the upper and lower end covers, The spring assembly is press-fitted with the corresponding end faces of the upper and lower end covers, and a slotted hole is provided on the corresponding section of the piston rod and the piston joint, and a slot for connecting with the driving crank arm is slidably fitted in the slotted hole. For the pin shaft of transmission connection, a mounting hole for installing the pin shaft is provided on the cylinder wall of the piston joint corresponding to the long slot hole, and a buffer device is fixed below the piston joint at the lower end of the piston rod.

The upper end cover is adjustable and fixed on the piston rod through threads.

The buffer device is an oil buffer, and a piston connected with the piston rod is arranged in the oil buffer, and the shell of the oil buffer is fixedly arranged under the contact spring device.

The buffer device is a rubber pad buffer.

The vacuum circuit breaker of the utility model arranges the buffer device directly under the contact spring device, and the transmission rod of the moving contact is directly buffered by the buffer device through the contact spring device, so that the buffer effect of the buffer device can be improved, and the dynamic The overshoot and bounce of the contact at the end of the opening period can ensure the normal operation of the vacuum circuit breaker.

Description of drawings

Fig. 1 is a structural schematic diagram of a switch-off buffer device for a vacuum circuit breaker in the prior art;

Figure 2 is a cross-sectional view of the single-stage transmission structure of the vacuum circuit breaker in Figure 1;

Fig. 3 is a structural schematic diagram of an embodiment of the opening and buffering device for the vacuum circuit breaker of the present invention;

Fig. 4 is a schematic structural view of the contact spring device in Fig. 3;

Fig. 5 is a structural schematic diagram of an embodiment of the vacuum circuit breaker of the present invention.

Detailed ways

As shown in Fig. 3 and Fig. 4, an opening buffer device for a vacuum circuit breaker includes a contact spring device 10 for transmission connection with the transmission rod of the moving contact. The contact spring device 10 includes an upper end for connecting with the moving contact The piston rod 21 connected by the transmission rod of the contact is slidingly sleeved at the lower end of the piston rod 21 of the contact spring device. A cylindrical piston joint 25 with a mounting hole for matching with the piston rod is provided at the bottom of the upper cylinder. , the lower part of the piston rod 21 is provided with a shoulder 28 adapted to the piston joint 25, and the upper end surface of the shaft shoulder 28 is used to press fit with the downward end surface of the upper cylinder bottom of the piston joint 25, and the piston rod 21 The lower sliding sleeve is provided with a lower end cover 24, the lower end surface of the lower end cover 24 is press-fitted with the upward end surface of the upper cylinder bottom of the piston joint 25, and the upper end cover 22 is adjustable and fixed on the piston rod 21. , the upper end cover 22 can be adjusted axially on the piston rod 21, and a spring assembly 23 is arranged between the upper and lower end covers on the piston rod 21, and the spring assembly is press-fitted with the corresponding end faces of the upper and lower end covers. On the corresponding section of the piston rod 21 and the piston joint 25, a slotted hole 26 is provided, and a pin shaft 27 for transmission connection with the driving crank arm 11 is slidably fitted in the slotted hole 26. On the cylinder wall of the piston joint 25 Opposite to the slotted hole 26, there is a mounting hole for installing the pin shaft. After the assembly of the contact spring device is completed, the mounting hole is usually aligned with the lower edge of the slotted hole 26. The piston rod 21 of the contact spring device is connected to the oil buffer 12 as a buffer device. A piston for connecting with the piston rod is arranged inside the oil buffer 12, and the housing of the oil buffer is fixed below the piston joint.

In the above embodiments, the buffer device provided at the lower end of the piston rod is an oil buffer 12, and a rubber pad buffer can also be used in specific implementation.

In the above embodiment, the spring assembly is a spring, and in practice, the spring assembly can also be a composite spring composed of an inner spring and an outer spring sleeved on the piston rod.

During specific implementation, the upper end cover can also be set and fixed on the piston rod in other ways. For example, a series of positioning holes are arranged in the axial direction on the upper end of the piston rod. The hole is matched with the installation hole for installing the pin. When the upper end cover is set on the piston rod, the pin is inserted into the installation hole on the upper end cover. At this time, the pin plays the role of fixing the upper end cover. When it is necessary to adjust the upper end cover When the piston rod is in the upward position, pull out the pin, adjust the upper end cover to the corresponding position, and re-insert the pin.

When the vacuum circuit breaker is closed, the driving crank arm drives the piston joint to move upward through the pin shaft, and the piston joint drives the piston rod to move upward through the lower end cover, spring assembly, and upper end cover, thereby realizing the contact between the dynamic and static contacts, and then the crank arm Continue to drive the pin shaft to move upward along the slotted hole on the piston rod, and compress the spring until the overtravel in the slotted hole is completed. This process not only achieves the effect of closing buffer to control the bounce, but also ensures the final closing of the contact. At the same time, the energy stored in the spring provides auxiliary kinetic energy for opening; when the vacuum circuit breaker performs opening operation, the driving crank arm drives the piston joint to move downward along the long slot hole of the piston rod through the pin shaft. When the potential energy stored in the spring is released, the piston joint accelerates to move downward until the overtravel is completed. At this time, the dynamic and static contacts are disconnected. However, because the speed at the end of the opening stage is relatively large, the piston rod will continue to move downward. At this time, the buffer device at the lower end of the piston rod prevents the piston rod from overshooting and rebounding in the piston joint, thereby better protecting the vacuum circuit breaker.

As shown in Fig. 5, Fig. 3 and Fig. 4, a vacuum circuit breaker includes a driving crank arm 11 and an opening and buffering device connected by the driving arm 11, wherein the opening and buffering device is arranged on a single unit on the vacuum circuit breaker. In the stage transmission structure 30, the structure of the opening buffer device is as shown in Fig. 3 and Fig. 4 .

Claims (10)

1. vacuum circuit-breaker splitting lock cushioning device, comprise and be used for the contact spring arrangement that the drive link with moving contact is in transmission connection, this contact spring arrangement comprises that the upper end is used for the piston rod that the drive link with moving contact is in transmission connection, and is characterized in that: be provided with the buffer unit that the piston rod with the contact spring arrangement is in transmission connection below described contact spring arrangement.

2. vacuum circuit-breaker splitting lock cushioning device according to claim 1, it is characterized in that: that the lower end slip cap of the piston rod of described contact spring arrangement is equipped with tubular and at the bottom of the tube of top, be provided with the piston joint that is used for the suitable installing hole of piston rod, the bottom of described piston rod is provided with and is used for the shaft shoulder adaptive with piston joint, the end face roof pressure down that the upper surface of this shaft shoulder is used at the bottom of the top tube with described piston joint cooperates, slip cap is equipped with bottom end cover in the bottom of piston rod, end face roof pressure up at the bottom of the top tube of the lower surface of this bottom end cover and described piston joint cooperates, the adjustable upper end cover that is installed with on the top of piston rod, on the described piston rod on described, be set with spring assembly between the bottom end cover, this spring assembly and described on, the corresponding end-faces roof pressure of bottom end cover cooperates, be provided with long slot bore with the corresponding section of piston joint on the described piston rod, slidable fit is useful on and drives the bearing pin that connecting lever is in transmission connection in the described long slot bore, on the barrel of described piston joint, be provided with the installing hole that is used to install bearing pin, below piston joint, be installed with buffer unit in the lower end of described piston rod with the long slot bore corresponding section.

3. vacuum circuit-breaker splitting lock cushioning device according to claim 2 is characterized in that: described upper end cover is installed on the described piston rod by screw thread is adjustable.

4. according to claim 1 or 2 or 3 described vacuum circuit-breaker splitting lock cushioning devices, it is characterized in that: described buffer unit is an oil bumper, be provided with the piston that is connected with described piston rod in this oil bumper, the housing of this oil bumper is installed in the below of described contact spring arrangement.

5. according to claim 1 or 2 or 3 described vacuum circuit-breaker splitting lock cushioning devices, it is characterized in that: described buffer unit is the rubber blanket buffer.

6. vacuum circuit-breaker, comprise the splitting lock cushioning device that drives connecting lever and be in transmission connection by the driving connecting lever, this splitting lock cushioning device comprises and is used for the contact spring arrangement that the drive link with moving contact is in transmission connection, this contact spring arrangement comprises that the upper end is used for the piston rod that the drive link with moving contact is in transmission connection, and is characterized in that: be provided with the buffer unit that the piston rod with the contact spring arrangement is in transmission connection below described contact spring arrangement.

7. vacuum circuit-breaker according to claim 6, it is characterized in that: that the lower end slip cap of the piston rod of described contact spring arrangement is equipped with tubular and at the bottom of the tube of top, be provided with the piston joint that is used for the suitable installing hole of piston rod, the bottom of described piston rod is provided with and is used for the shaft shoulder adaptive with piston joint, the end face roof pressure down that the upper surface of this shaft shoulder is used at the bottom of the top tube with described piston joint cooperates, slip cap is equipped with bottom end cover in the bottom of piston rod, end face roof pressure up at the bottom of the top tube of the lower surface of this bottom end cover and described piston joint cooperates, the adjustable upper end cover that is installed with on the top of piston rod, on the described piston rod on described, be set with spring assembly between the bottom end cover, this spring assembly and described on, the corresponding end-faces roof pressure of bottom end cover cooperates, be provided with long slot bore with the corresponding section of piston joint on the described piston rod, slidable fit is useful on and drives the bearing pin that connecting lever is in transmission connection in the described long slot bore, on the barrel of described piston joint, be provided with the installing hole that is used to install bearing pin, below piston joint, be installed with buffer unit in the lower end of described piston rod with the long slot bore corresponding section.

8. vacuum circuit-breaker according to claim 7 is characterized in that: described upper end cover is installed on the described piston rod by screw thread is adjustable.

9. according to claim 6 or 7 or 8 described vacuum circuit-breakers, it is characterized in that: described buffer unit is an oil bumper, is provided with the piston that is connected with described piston rod in this oil bumper, and the housing of this oil bumper is installed in the below of described contact spring arrangement.

10. according to claim 6 or 7 or 8 described vacuum circuit-breakers, it is characterized in that: described buffer unit is the rubber blanket buffer.

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