Insulating pull rod with oil buffer
By designing the structure with its own oil buffer and reset pressure spring in the insulated pull rod of the high-voltage circuit breaker, the problems of opening rebound and overshoot are solved, and a more stable opening process and more efficient testing are achieved.
Patent Information
- Application Number
- CN202421174356.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-27
AI Technical Summary
During the opening process of high-voltage circuit breakers, it is easy to have a break-out rebound and overshoot, resulting in the closing bounce time and break-out rebound exceeding the standard.
An insulated pull rod with its own oil buffer is designed. By installing a double-head oil buffer and a reset pressure spring in the insulated pull rod body, the oil buffer and elastic rebound force absorb and release energy, and control the opening rebound and rebound and Overshoot.
It effectively avoids the closing bounce time and the opening rebound exceeding the standard, improves the opening stability and testing efficiency of the circuit breaker, and reduces the debugging intensity.
Smart Images
Figure CN222440506U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of insulating pull rods of high-voltage circuit breakers, and more specifically to an insulating pull rod with an oil buffer. Background Art
[0002] High-voltage circuit breakers are responsible for the protection and control of overload, short circuit and other electrical equipment in high-voltage power supply and distribution systems. When the circuit breaker is working, it mainly relies on the contact and separation of the moving and static contacts of the arc extinguishing chamber to complete the closing and opening operations. In the actual test process, the circuit breaker opening rebound and overshoot are characteristics that require strict control. The reason for the opening rebound is that when the circuit breaker is opened, the insulating rod moves downward under the pressure of the contact spring and the opening spring. Since the movement energy of the entire insulating rod needs to be absorbed by the main oil buffer, if the energy absorbed by the main oil buffer is less than the movement energy of the insulating rod and the transmission system, the transmission system and the insulating rod still maintain the original movement trend under the action of excess energy, and the insulating rod will vibrate multiple times to release energy, causing the opening rebound. Overshoot is positively correlated with the opening rebound. The greater the rebound, the greater the overshoot. In view of this, we propose an insulating rod with its own oil buffer. Utility Model Content
[0003] The purpose of the present application is to provide an insulating pull rod with its own oil buffer, which solves the technical problems in the above-mentioned background technology and achieves the technical effect of avoiding excessive closing bounce time and excessive opening rebound.
[0004] The technical solution of the present application provides an insulating pull rod with a built-in oil buffer, including: an insulating pull rod body and a top insert fixed at one end of the insulating pull rod body and a bottom insert at the other end, a double-headed oil buffer being detachably installed in the bottom insert, the double-headed oil buffer including an outer shell and two buffer plugs of a piston at both ends of the outer shell, the two buffer plugs being elastically connected, the oil return speed in the outer shell being adjustable, a guide rod being slidably inserted in the top insert, and the guide rod being elastically connected to the insulating pull rod body.
[0005] By adopting the above technical solution, there are threads on the outside of the shell, and the relative position of the parts will not change by meshing the threads with the threads on the bottom insert. When the double-headed oil buffer is lifted and rotated to the highest point, it is ensured that when the circuit breaker is opened, the insulating pull rod body is released to move downward, driving the moving conductive rod of the arc extinguishing chamber to separate from the static end of the arc extinguishing chamber. When the insulating pull rod body continues to move downward, the opening spring also starts to drive the motion system to maintain the movement trend. When it reaches the opening position, the main shaft oil buffer will limit the main shaft position. Because the insulating pull rod body is connected to the main shaft, the position of the insulating pull rod is limited, so that the pull rod remains in the closed position;
[0006] In order to successfully open the circuit breaker, most of the energy of the moving parts needs to be absorbed by the spindle oil buffer. When the spindle oil buffer movement cannot absorb all the energy, the insulating pull rod body will still maintain its original movement trend under the action of excess energy, and the excess energy will be absorbed by the double-headed oil buffer installed inside the insulating pull rod body. Under the joint action of the internal double-headed oil buffer and the traditional buffer, the opening rebound is controlled within an acceptable range, which improves the test efficiency and reduces the debugging intensity.
[0007] As an optional solution of the technical solution of the present application document, a reset compression spring is fixedly installed between the two buffer plugs, an adjusting bolt is threadedly connected to the shell, and a contact compression spring is fixedly installed between the guide rods.
[0008] By adopting the above technical scheme, the two buffer plugs compress the reset spring and generate an elastic rebound force when they move relative to each other, so that the two buffer plugs are reset by the elastic rebound force of the reset spring during the resetting process, and a traditional buffer is formed between the contact compression spring and the guide rod, and when the circuit breaker is opened, the contact force of the contact compression spring is released to drive the insulating pull rod body to move downward, driving the moving conductive rod of the arc extinguishing chamber to separate from the static end of the arc extinguishing chamber, and by rotating the adjusting bolt, the return oil speed inside the casing is changed, and finally the damping of the buffer is changed.
[0009] As an optional solution of the technical solution of the present application document, an upper piston rod detachable from the insulating pull rod body is fixed to the buffer plug at one end, and a lower piston rod is fixed to the buffer plug at the other end.
[0010] By adopting the above technical solution, the upper end of the upper piston rod is embedded in the insulating pull rod body. When the double-headed oil buffer is lifted and rotated to the highest point, the buffer head on the upper piston rod is flush with the step on the bottom insert, ensuring that when the circuit breaker is opened, the contact force of the contact compression spring is released to drive the insulating pull rod body to move downward, driving the moving conductive rod of the arc extinguishing chamber to separate from the static end of the arc extinguishing chamber.
[0011] As an optional solution of the technical solution of the present application document, the upper piston rod and the lower piston rod are both sleeved with a plurality of sealing rings embedded in the outer shell, and the lower piston rod and the guide rod are both fixedly installed with a screw rod.
[0012] By adopting the above technical solution, a sealing ring is embedded in the housing to improve the oil sealing effect, and a screw rod is used to facilitate the overall assembly.
[0013] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
[0014] 1. This application installs a double-headed oil buffer inside the lower insert of the insulating pull rod, the upper end of the buffer body is connected to the insert, the lower end is connected to the screw rod, and the screw rod is extended outward. The original matching dimensions and external interfaces are guaranteed to remain unchanged; when the circuit breaker is opened, the double-headed oil buffer can assist in absorbing the excess energy released by the insulating pull rod and the contact spring, and suppress the rebound and overshoot of the opening. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the overall cross-section structure of an insulating pull rod with an oil buffer disclosed in a preferred embodiment of the present application;
[0016] Figure 2 A preferred embodiment of the present application discloses an insulating pull rod with an oil buffer Figure 1 The enlarged structural diagram at A in the middle;
[0017] Explanation of the numbers in the figure: 1. Contact compression spring; 2. Insulating pull rod body; 3. Top insert; 4. Bottom insert; 5. Double-headed oil buffer; 501, buffer plug; 6. Screw rod; 7. Upper piston rod; 8. Lower piston rod; 9. Reset compression spring; 10. Housing; 11. Adjusting bolt; 12. Sealing ring; 13. Guide rod. DETAILED DESCRIPTION
[0018] The present application is further described in detail below in conjunction with the accompanying drawings.
[0019] An insulating pull rod with an oil buffer comprises: an insulating pull rod body 2 and a top insert 3 fixed at one end of the insulating pull rod body 2 and a bottom insert 4 at the other end, a double-headed oil buffer 5 is detachably installed in the bottom insert 4, the double-headed oil buffer 5 comprises an outer shell 10 and two buffer plugs 501 of a piston at both ends of the outer shell 10, the two buffer plugs 501 are elastically connected, the oil return speed in the outer shell 10 is adjustable, a guide rod 13 is slidably inserted in the top insert 3, and the guide rod 13 is elastically connected to the insulating pull rod body 2.
[0020] Reference Figure 1 and Figure 2 , there are threads on the outside of the housing 10, and the relative positions of the parts will not change through the engagement of the threads with the threads on the bottom insert 4. When the double-headed oil buffer 5 is lifted and rotated to the highest point, it is ensured that when the circuit breaker is opened, the insulating rod body 2 is released to move downward, driving the moving conductive rod of the arc extinguishing chamber to separate from the static end of the arc extinguishing chamber. When the insulating rod body 2 continues to move downward, the opening spring also starts to drive the motion system to maintain the movement trend. When the opening position is reached, the main shaft oil buffer will limit the main shaft position. Because the insulating rod body 2 is connected to the main shaft, the insulating rod position is limited, so that the rod remains in the closed position;
[0021] In order to successfully open the circuit breaker, most of the energy of the moving parts needs to be absorbed by the main shaft oil buffer. When the main shaft oil buffer movement cannot absorb all the energy, under the action of excess energy, the insulating pull rod body 2 will still maintain the original movement trend, and the excess energy will be absorbed by the double-headed oil buffer 5 installed inside the insulating pull rod body 2. Under the joint action of the internal double-headed oil buffer 5 and the traditional buffer, the opening rebound is controlled within an acceptable range, which improves the test efficiency and reduces the debugging intensity.
[0022] A reset compression spring 9 is fixedly installed between the two buffer plugs 501 , an adjusting bolt 11 is threadedly connected to the housing 10 , and a contact compression spring 1 is fixedly installed between the guide rods 13 .
[0023] Reference Figure 1 and Figure 2 When the two buffer plugs 501 move relative to each other, the reset spring 9 is compressed and an elastic rebound force is generated, so that the two buffer plugs 501 are reset by the elastic rebound force of the reset spring 9 during the resetting process. A traditional buffer is formed between the contact compression spring 1 and the guide rod 13, and when the circuit breaker is opened, the contact force of the contact compression spring 1 is released to drive the insulating pull rod body 2 to move downward, driving the moving conductive rod of the arc extinguishing chamber to separate from the static end of the arc extinguishing chamber, and by rotating the adjusting bolt 11, the return oil speed inside the housing 10 is changed, and finally the damping of the buffer is changed.
[0024] An upper piston rod 7 detachable from the insulating pull rod body 2 is fixed to the buffer plug 501 at one end, and a lower piston rod 8 is fixed to the buffer plug 501 at the other end.
[0025] Reference Figure 1 and Figure 2 The upper end of the upper piston rod 7 is embedded in the insulating pull rod body 2. When the double-headed oil buffer 5 is lifted and rotated to the highest point, the buffer head on the upper piston rod 7 is flush with the step on the bottom insert 4, ensuring that when the circuit breaker is opened, the contact force of the contact compression spring 1 is released to drive the insulating pull rod body 2 to move downward, driving the moving conductive rod of the arc extinguishing chamber to separate from the static end of the arc extinguishing chamber.
[0026] The upper piston rod 7 and the lower piston rod 8 are both sleeved with a plurality of sealing rings 12 embedded in the outer shell 10 , and the lower piston rod 8 and the guide rod 13 are both fixedly mounted with the screw rod 6 .
[0027] Reference Figure 1 and Figure 2 A sealing ring 12 is embedded in the housing 10 to improve the oil sealing effect, and the overall assembly is facilitated by a screw rod 6.
[0028] Working principle: Under the action of the screw 6, when the double-headed oil buffer 5 is lifted and rotated to the highest point, the buffer head on the upper piston rod 7 is flush with the step on the bottom insert 4, ensuring that when the circuit breaker is opened, the contact force of the contact compression spring 1 at the guide rod 13 is released to drive the insulating rod body 2 to move downward, driving the moving conductive rod of the arc extinguishing chamber to separate from the static end of the arc extinguishing chamber. When the insulating rod body 2 continues to move downward, the opening spring also starts to drive the motion system to maintain the movement trend. When it reaches the opening position, the main shaft oil buffer will limit the main shaft position. Because the insulating rod body 2 is connected to the main shaft, the insulating rod position is limited, so that the rod remains in the closed position;
[0029] Under the action of excess energy, the insulating pull rod body 2 will still maintain its original movement trend, and the excess energy will be compressed by the internal oil and the reset spring 9 through the relative movement of the two buffer plugs 501. Under the joint action of the internal double-headed oil buffer 5 and the traditional buffer, the rebound of the opening switch is controlled within an acceptable range, thereby improving the test efficiency and reducing the debugging intensity.
Claims
1. An insulating pull rod with an oil buffer, characterized in that: include: An insulating pull rod body (2) and a top insert (3) fixed at one end of the insulating pull rod body (2) and a bottom insert (4) at the other end; a double-headed oil buffer (5) is detachably installed in the bottom insert (4); the double-headed oil buffer (5) comprises an outer shell (10) and two buffer plugs (501) of a piston at both ends of the outer shell (10); the two buffer plugs (501) are elastically connected; the oil return speed in the outer shell (10) is adjustable; a guide rod (13) is slidably inserted in the top insert (3); the guide rod (13) is elastically connected to the insulating pull rod body (2).
2. The insulating pull rod with oil buffer according to claim 1, characterized in that: A reset compression spring (9) is fixedly installed between the two buffer plugs (501), an adjusting bolt (11) is threadedly connected to the housing (10), and a contact compression spring (1) is fixedly installed between the guide rods (13) and the guide rods (13).
3. The insulating pull rod with oil buffer according to claim 1, characterized in that: An upper piston rod (7) detachable from the insulating pull rod body (2) is fixed to the buffer plug (501) at one end, and a lower piston rod (8) is fixed to the buffer plug (501) at the other end.
4. The insulating pull rod with oil buffer according to claim 3 is characterized in that: The upper piston rod (7) and the lower piston rod (8) are both sleeved with a plurality of sealing rings (12) embedded in the outer shell (10), and the lower piston rod (8) and the guide rod (13) are both fixedly mounted with a screw rod (6).