CN106291345B - A load simulation mechanism and load simulation test device of a circuit breaker operating mechanism - Google Patents

Abstract

The invention relates to a load simulation mechanism of a circuit breaker operating mechanism and a load simulation test device. A load simulation mechanism of a circuit breaker operating mechanism comprises a buffer cylinder and a piston arranged in the buffer cylinder. The operating rod connected by the driving mechanism can drive the piston to act together. At least one place on the piston or the buffer cylinder or between the piston and the buffer cylinder is provided with a damping channel connecting the cavities on both sides of the piston. When the piston moves toward the rod cavity , the gas in the rod cavity is compressed, and when the gas in the rod cavity enters the rodless cavity through the damping channel, it buffers the force generated by the piston. When the piston moves to the rodless cavity, the gas in the rodless cavity is compressed. When the compression passes through the damping channel and enters the rod cavity, a force is exerted on the piston. This kind of simulation test of the circuit breaker using gas as the load can simulate the actual working condition of the circuit breaker more realistically and effectively, and the test results are highly reliable.

Description

A load simulation mechanism and load simulation test device of a circuit breaker operating mechanism

technical field

The invention relates to a load simulation mechanism of a circuit breaker operating mechanism and a load simulation test device using the load simulation mechanism.

Background technique

The opening and closing of the circuit breaker is mainly realized by the operating mechanism, so the characteristics of the circuit breaker are also mainly determined by the operating mechanism, such as the opening and closing speed, the opening time and the closing time. Reliability, each operating mechanism must be debugged with a load and undergo a certain number of operation tests before leaving the factory. Because the operating work of the circuit breaker, especially the operating mechanism of the high-voltage circuit breaker is very large, in the absence of a certain load , the action of the operating mechanism is easy to damage itself, that is, it cannot be operated independently, and it must be assembled with the pillars and arc extinguishing chambers of the circuit breaker to perform actions or tests. It is large, and the cost of assembly is high. At present, the method of adjustable counterweight is used as the load for testing. As shown in Figure 1, the simulated experimental device includes a buffer cylinder 1, a piston rod The counterweight 3 is deployed, the operating mechanism is connected with the piston rod 2 and the operating rod, and the piston rod 2 drives the adjustable counterweight 3 to complete the simulated opening and closing action in the buffer cylinder 1, but the contact of the circuit breaker is actually under high pressure. Therefore, the resistance of the contacts of the circuit breaker in actual work is generated by the action of the high-voltage insulating gas inside the circuit breaker. Therefore, the simulation test using the adjustable counterweight as the load cannot be truly and effectively simulated. The actual working conditions of the circuit breaker, and the vibration amplitude is large and the noise is harsh during use.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a load simulation mechanism of the circuit breaker operating mechanism that can truly and effectively simulate the actual working conditions of the circuit breaker; at the same time, the purpose of the present invention is to provide a load simulation test device using the load simulation mechanism .

In order to achieve the above purpose, the technical scheme of a load simulation mechanism for a circuit breaker operating mechanism of the present invention is: a load simulation mechanism for a circuit breaker operating mechanism, comprising a buffer cylinder and a piston arranged in the buffer cylinder, and the piston An operating rod is provided for drivingly connected with the operating mechanism and capable of driving the piston to act together. At least one place on the piston or on the buffer cylinder or between the piston and the buffer cylinder is provided with a damping channel connecting the cavities on both sides of the piston.

One-way valve is provided on one of the cavity wall of the rod cavity and the cavity wall of the rodless cavity, and the other cavity wall is provided with a convection hole.

The one-way valve is arranged on the cavity wall of the rod cavity, and the convection hole is arranged on the cavity wall of the rodless cavity.

The buffer cylinder comprises a cylinder body and a cover plate which is sealingly matched with one end of the cylinder body, the cover plate, the cylinder body and the piston form the rod cavity, and the one-way valve is arranged on the cover plate.

The one-way valve includes an air passage provided on the cover plate for allowing the gas outside the buffer cylinder to enter the rod cavity, the air passage forms an air port on the inner surface of the cover plate, and the one-way valve further includes an air port arranged on the air port. A floating baffle used to cover the port when the piston moves close to the port and open the port when the piston moves away from the port.

The cover plate is provided with a limiting structure for limiting the maximum movement stroke of the floating baffle.

The damping passage includes air holes provided on the piston and communicating with the cavities on both sides of the piston.

The load simulating mechanism of the circuit breaker operating mechanism further comprises a sealed casing surrounding the periphery of the buffer cylinder, and the cylinder wall of the sealed casing is provided with an operating rod perforation for the operating rod to pass through.

The airtight casing is provided with an air pressure gauge for detecting the air pressure inside the airtight casing.

The technical scheme of a load simulation test device of the present invention is: a load simulation test device, comprising a power mechanism and a load simulation mechanism, and the load simulation mechanism adopts the load simulation mechanism of the circuit breaker operating mechanism described above. .

The beneficial effects of the invention are: when the piston moves toward the rod cavity, the gas in the rod cavity is compressed, and when the gas in the rod cavity enters the rodless cavity through the damping channel, the force generated by the piston plays a buffering role. When the piston moves to the rodless cavity, the gas in the rodless cavity is compressed and enters into the rod cavity through the damping channel to generate a force on the piston. This kind of simulation test of the circuit breaker using gas as the load can be more realistic and effective. The actual working conditions of the circuit breaker, the test results have high reliability.

Further, the arrangement of the sealing shell and the buffer cylinder together form a double-layer shell, which can effectively reduce the noise during the test.

Description of drawings

Fig. 1 is the structural representation of the simulation test device in the background technology;

2 is a schematic structural diagram of an embodiment of a load simulation test device of the present invention;

FIG. 3 is a partial enlarged view of A in FIG. 2 .

Detailed ways

The embodiments of the present invention will be further described below with reference to the accompanying drawings. A specific embodiment of a load simulation test device of the present invention, as shown in FIG. 2 to FIG. 3 , includes a power mechanism and a load simulation mechanism. The power mechanism includes a power input pull rod 19 , a crank arm 20 and a support for the crank arm 20 to be installed. The shaft 21, one end of the crank arm 20 is connected with the power input rod 19 in a transmission connection, and the load simulation mechanism includes a sealed casing 10, a buffer cylinder 4 arranged inside the sealed casing 10, a piston 5 arranged in the buffer cylinder 4, and a The operating rod 7 on the 5 can drive the piston 5 to act together and pass through the outside of the sealing shell 10. The operating rod 7 is in sliding and sealing cooperation with the sealing shell 10. The outer circular surface of the piston 5 is provided with a wear ring 6 to extend During the service life of the piston 5 , the end of the operating rod 7 is connected with the other end of the crank arm 20 in a driving manner. The sealed housing 10 includes an outer cylinder body and a support plate 12. The outer cylinder body is a U-shaped structure. The outer cylinder body and the support plate 12 are sealed and cooperated to form a closed cavity. The operating lever is pierced through the hole. Both the sealed shell and the buffer cylinder are filled with high-pressure gas of 0.6MPa, because the actual working condition of the contact of the circuit breaker is in the insulating gas environment of 0.6MPa, this setting can better simulate the actual operation of the circuit breaker. to improve the reliability of the test results.

The buffer cylinder 4 includes a cylinder block 14 and a cover plate 15 arranged at the lower end of the cylinder block 14. The cylinder block 14 is a U-shaped cylinder structure with a cylinder cover at one end. The cover plate 15 is in sealing fit with the open end of the cylinder block 14. There is a through hole corresponding to the through hole of the operating rod for the operating rod 7 to pass through. The cover plate 15 can act as the other end cylinder cover of the buffer cylinder 4. The piston cavity is divided into a rod cavity and a rodless cavity, and the cover plate 15, the cylinder 14 and the piston 5 form the above rod cavity. The piston 5 is provided with an air hole 8 that communicates with the rod cavity and the rodless cavity, and the air hole 8 forms a damping channel. The plate 15 is provided with a one-way valve. The one-way valve includes an air passage 16 arranged on the cover plate 15 and capable of allowing the gas inside the sealed housing to enter the rod cavity. The air passage 16 forms an air port on the inner surface of the cover plate 15. The floating baffle 17 at the air port is used to cover the air port when the piston 5 moves close to the one-way valve and open the air port when the piston 5 moves away from the one-way valve. The cover plate 15 is also provided with a floating baffle 17 for limiting the maximum The limit plate 18 of the travel stroke. The cover plate 15 is a stepped structure and includes a first part of the cover plate and a second part of the cover plate. The first part of the cover plate is used for sealing with the end of the cylinder body 14 of the buffer cylinder 4 , and the second part of the cover plate is located in the cylinder body of the buffer cylinder 4 . Inside 14, the limiting plate 18 is arranged on the second part of the cover plate, the floating baffle 17 is a circular plate slidably sleeved on the operating rod 7, and the air passage 16 includes a first air hole arranged on the first part of the cover plate. A channel and a second air channel arranged on the second part of the cover plate, and the second air channel forms the above-mentioned air port on the inner surface of the second part of the cover plate. The limiting plate 18 is an L-shaped plate, and the freely folded portion of the L-shaped plate is used to limit the maximum stroke of the upward movement of the floating baffle 17 . An air pressure detection hole 13 is provided on the cylinder cover at the end of the outer cylinder of the sealed casing 10 away from the support plate, and a pressure detection hole 13 is installed on the above-mentioned cylinder head of the outer cylinder of the sealed casing 10 for detecting the air pressure inside the sealed casing. Barometer 11.

The working process of the present invention is as follows: when the power mechanism drives the operating rod 7 and the piston 5 to move toward the rod cavity together, the piston 5 compresses the gas in the rod cavity, and the gas in the rod cavity enters the rodless cavity through the air hole 8 At this time, the one-way valve is closed, and the gas in the rod cavity is discharged to the inside of the sealed housing 10 through the air hole 8 on the piston 5 and the convection hole 9 on the rodless cavity, Observe the indication of the air pressure gauge 11. When the power mechanism drives the operating rod 7 and the piston 5 to move toward the rodless cavity, the one-way valve is turned on, and the gas in the sealed housing 10 enters the rod cavity. Observe the indication of the air pressure gauge 11. At this time, a part of the gas in the rodless cavity is compressed through the air hole 8 and enters the rod cavity to buffer the piston 5, and the other part is discharged through the convection hole. The above simulation test of the circuit breaker using gas as the load can be more realistic. It seems to effectively simulate the actual working conditions of the circuit breaker, which improves the credibility of the test results.

In other embodiments of the present invention, an air groove extending along the axis of the buffer cylinder can also be arranged on the upper circumference of the cylinder wall of the buffer cylinder, and the air groove forms a damping channel; Air grooves are set on the top to form damping channels; one-way valve can also be set on the cavity wall of the rodless cavity; one-way valve and convection hole can also not be set when it is used; the convection hole can also be set without buffer cylinder. The cover can be set on the side wall of the rodless cavity; a one-way valve can also be set on the side wall of the rod cavity; the floating baffle can also be replaced by a floating stop ball, and the limit plate is used to limit the floating The stroke of the blocking ball; when the noise is within the range of standard requirements or when there is no gas pressure requirement, it is not necessary to set an external sealing shell; it is also possible not to set a limit plate; the limit plate can also be set on the operating rod. The limit cylinder is replaced to play the role of the limit structure. At this time, the floating baffle is located inside the limit cylinder; the gas pressure in the sealing shell and the buffer cylinder can be adjusted according to actual needs.

The embodiment of a load simulation mechanism of a circuit breaker operating mechanism is the same as the embodiment of the load simulation mechanism in each embodiment of the above-mentioned load simulation test device, and will not be repeated here.

Claims (4)

1. A load simulation mechanism for a circuit breaker operating mechanism, characterized in that: it comprises a buffer cylinder and a piston arranged in the buffer cylinder, and the piston is provided with an operating rod that can drive the piston to act together for drivingly connected with the operating mechanism , the piston is provided with a damping channel connecting the cavities on both sides of the piston; one of the cavity wall of the rod cavity and the cavity wall of the rodless cavity is provided with a one-way valve, and the other cavity wall is provided with a convection hole; The one-way valve is arranged on the cavity wall of the rod cavity, and the convection hole is arranged on the cavity wall of the rodless cavity; the buffer cylinder includes a cylinder body and a cover plate that is sealed and matched with one end of the cylinder body, and the cover plate is connected to the cylinder body. and the piston forms the rod cavity, and the one-way valve is arranged on the cover plate; the one-way valve includes an air passage provided on the cover plate for the gas outside the buffer cylinder to enter the rod cavity, The air passage forms an air port on the inner surface of the cover plate, and the one-way valve also includes a floating baffle plate arranged on the air port for closing the air port when the piston moves close to the air port and opening the air port when the piston moves away from the air port; There are air holes that communicate with the rod cavity and the rodless cavity, and the air holes form a damping channel; the load simulation mechanism of the circuit breaker operating mechanism also includes a sealing shell surrounding the periphery of the buffer cylinder, and the cylinder wall of the sealing shell is provided with a A perforation of the operating rod for the operating rod to pass through and for sliding and sealing with the operating rod. 2 . The load simulation mechanism of the circuit breaker operating mechanism according to claim 1 , wherein the cover plate is provided with a limit structure for limiting the maximum movement stroke of the floating baffle. 3 . 3 . The load simulation mechanism of the circuit breaker operating mechanism according to claim 1 , wherein the airtight casing is provided with an air pressure gauge for detecting the air pressure inside the airtight casing. 4 . 4. A load simulation test device, comprising a power mechanism and a load simulation mechanism, wherein the load simulation mechanism adopts the load simulation mechanism of a circuit breaker operating mechanism according to any one of claims 1-3.

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