A circuit breaker operating mechanism energy storage spring self-adjusting system

Abstract

The present invention relates to a self-adjusting system for energy storage springs of a circuit breaker operating mechanism, wherein the energy storage spring is arranged in an operating mechanism box of the circuit breaker, and the energy storage spring is installed in a spring barrel. The self-adjusting system includes a pressure sensor installed in the spring barrel, the pressure sensor is against one side of the energy storage spring, and the other side of the energy storage spring is against a spring pressure plate. A spring pull rod is also arranged in the spring barrel, the spring pull rod is fixed to the spring pressure plate, and drives the spring pressure plate to translate in the spring barrel; a stepper motor is arranged outside the spring barrel, the stepper motor is connected to the spring pull rod; the stepper motor is connected to the spring pull rod through the cooperation of a threaded sleeve; and a control unit. The self-adjusting system of the present invention can drive the opening and closing energy storage springs to automatically adjust through the cooperation of an additional stepper motor and a threaded sleeve, and can greatly reduce the product operation risk by automatically increasing the spring compression to compensate for the spring force value drop caused by spring weakness.

Description

Technical Field

[0001] The invention relates to the field of circuit breakers, and in particular to a circuit breaker operating mechanism energy storage spring self-adjusting system. Background Art

[0002] High-voltage circuit breakers are important equipment in power systems, and the operating mechanism is its core power component. As the service life increases, fatigue and relaxation problems will inevitably occur in the opening and closing springs of the circuit breaker mechanism, which will gradually lead to mechanical failures such as refusal to open and incomplete closing, seriously affecting the reliability of the circuit breaker opening and closing. According to statistics, spring failure accounts for up to 40% of circuit breaker operating mechanism failures, so solving the problem of spring fatigue failure is of great significance to improving the reliability of circuit breakers.

[0003] At present, the problem of weak spring in circuit breaker mechanism can only be discovered during power outage pre-inspection or after a mechanical failure of the product. Even if the product is equipped with online monitoring of spring pressure, it only has the monitoring function and lacks the ability of subsequent automatic adjustment and fault elimination. It needs to be repaired and handled by manual power outage, which lasts for a long time and affects the reliability of power supply. The industry generally adopts friction to prevent loosening of the energy storage spring nut for opening and closing, such as torque or double nut structure, but the reliability of anti-loosening is not high. There are also destructive permanent anti-loosening methods, but they are not conducive to subsequent inspection, maintenance and adjustment. In addition, there is an online spring pressure monitoring system in the industry for use on circuit breaker mechanism, but it can only monitor the change of spring pressure and issue an early warning. The mechanism itself does not have an automatic adjustment function. When the system issues a defect warning, the on-site operation and maintenance personnel are still unable to eliminate the fault in time, and the line needs to be shut down for maintenance. In this case, the product will have operation risks. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a circuit breaker operating mechanism energy storage spring self-adjustment system to solve the problem of circuit breaker refusal to open and incomplete closing caused by fatigue relaxation of the energy storage spring or loosening of the nut, thereby improving the product operation reliability.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a circuit breaker operating mechanism energy storage spring self-adjusting system, the energy storage spring is arranged in the operating mechanism box of the circuit breaker, and the energy storage spring is installed in a spring cylinder. The innovation point is: the self-adjusting system includes

[0006] A pressure sensor installed in the spring barrel, the pressure sensor abuts against one side of the energy storage spring, and the other side of the energy storage spring abuts against a spring pressure plate. A spring pull rod is also arranged in the spring barrel, the spring pull rod is located at the center of the energy storage spring, and the two sides of the spring pull rod extend from the two sides of the spring barrel respectively. The spring pull rod is fixed to the spring pressure plate and drives the spring pressure plate to translate in the spring barrel, thereby realizing compression energy storage of the energy storage spring;

[0007] A stepper motor is arranged outside the spring tube, the stepper motor is connected to the spring pull rod and drives the spring pull rod to move back and forth;

[0008] The stepper motor is connected to the spring pull rod through the cooperation of the threaded sleeve, and the output shaft of the stepper motor is connected to the threaded sleeve through the cooperation of the guide flat key. The threaded sleeve is provided with a guide key groove for the guide flat key to be embedded.

[0009] A control unit, the control unit includes a data acquisition module and an intelligent monitoring module, the data acquisition module is connected to the pressure sensor, and converts the data signal detected by the pressure sensor and uploads it to the intelligent monitoring module, the intelligent monitoring module is connected to the data acquisition module and the stepper motor, and controls the stepper motor according to the data transmitted by the data acquisition module;

[0010] The adjustment method of the self-adjusting system comprises the following steps:

[0011] S1: First, the pressure sensor monitors the pressure change of the energy storage spring in real time, and feeds the monitoring value back to the data acquisition module, and then enters step S2;

[0012] S2: The data acquisition module converts the data monitored by the pressure sensor and transmits the converted data to the intelligent monitoring module, and then enters step S3:

[0013] S3: After receiving the data transmitted from the data acquisition module, the intelligent monitoring module compares the monitored data with the threshold value set in advance inside the intelligent monitoring module. If the monitored data reaches the set threshold value, it goes to step S4; if the monitored data does not reach the set threshold value, it goes to step S2;

[0014] S4: The intelligent monitoring module outputs an electric pulse signal to drive the stepper motor to work, and the stepper motor drives the threaded sleeve to rotate a step angle to increase the spring compression of the energy storage spring, and returns to step S2 after the stepper motor is activated;

[0015] S5: Adjustment completed.

[0016] Furthermore, a one-way bearing is also arranged inside the stepper motor.

[0017] Furthermore, the designed guide idle stroke between the output shaft of the stepper motor and the threaded sleeve is greater than the opening and closing stroke of the energy storage spring.

[0018] Furthermore, the length of the guide keyway on the threaded sleeve is greater than the compression stroke of the energy storage spring for normal opening and closing.

[0019] The advantages of the present invention are: the self-adjusting system of the present invention can drive the opening and closing energy storage springs to automatically adjust through the cooperation of an additional stepping motor and a threaded sleeve. When the spring pressure drops to a set threshold, the intelligent monitoring module sends an electric pulse signal to drive the stepping motor to rotate a set step angle. This solution automatically increases the spring compression to compensate for the decrease in spring force caused by spring weakness. In this way, the line can compensate for the decrease in spring force in real time without power outage, greatly reducing the risk of product operation. This is the first of its kind in the industry.

[0020] By designing a one-way bearing inside the stepper motor to ensure that the threaded sleeve does not rotate in the reverse direction, the problem of a decrease in the spring force value due to loosening of the threaded sleeve can be avoided.

[0021] The designed guide idle stroke between the output shaft of the stepper motor and the threaded sleeve is designed to be larger than the opening and closing stroke of the energy storage spring to ensure that the opening and closing operation is not affected.

[0022] The length of the guide keyway on the threaded sleeve is designed to be greater than the compression stroke of the energy storage spring during normal opening and closing operations, ensuring that no collision occurs between the motor output shaft and the threaded sleeve during normal opening and closing operations.

[0023] The added stepper motor is linked to the opening and closing spring fastening nut, and a one-way bearing is added to the motor itself, so the motor will not rotate in the opposite direction. This can completely avoid the problem of loosening of the spring fastening nut and reduce the opening and closing abnormalities caused by changes in the compression of the energy storage spring due to loose threads. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the energy storage spring self-adjusting system of the circuit breaker operating mechanism of the present invention.

[0025] Figure 2 It is a schematic diagram of the installation position of the pressure sensor in the present invention. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0027] like Figure 1 , Figure 2 The energy storage spring self-adjusting system of the circuit breaker operating mechanism shown in the figure, the energy storage spring is arranged in the operating mechanism box 7 of the circuit breaker, the energy storage spring 8 is installed in a spring cylinder 9, and the spring cylinder 9 is a hollow cylindrical sleeve structure. The self-adjusting system includes

[0028] A pressure sensor 10 is installed in the spring barrel 9, and the pressure sensor 10 is against one side of the energy storage spring 8. The other side of the energy storage spring 8 is against a spring pressure plate 6. A spring pull rod 5 is also arranged in the spring barrel 9. The spring pull rod 5 is located at the center of the energy storage spring 8, and the two sides of the spring pull rod 5 extend from the two sides of the spring barrel 9 respectively. The spring pull rod 5 is fixed to the spring pressure plate 6 and drives the spring pressure plate 6 to translate in the spring barrel 9, thereby realizing the compression energy storage of the energy storage spring 8.

[0029] A stepper motor 1 is arranged outside the spring barrel 9. The stepper motor 1 is fixed to the end of the spring barrel 9 through the cooperation of the mounting plate 2. The stepper motor 1 is connected to the spring pull rod 5 and drives the spring pull rod 5 to move back and forth, thereby realizing the compression of the energy storage spring 8.

[0030] The stepper motor 1 is connected to the spring pull rod 5 through the cooperation of the threaded sleeve 4, and the output shaft of the stepper motor 1 is connected to the threaded sleeve 4 through the cooperation of the guide flat key 3. A guide key groove for the guide flat key 3 to be embedded is opened in the threaded sleeve 4. The stepper motor 1 drives the threaded sleeve 4 to rotate and compress the spring pressure plate 6 to drive the energy storage spring to compress.

[0031] The designed guide idle stroke between the output shaft of the stepper motor 1 and the threaded sleeve 4 is greater than the opening and closing stroke of the energy storage spring 8. The designed guide idle stroke between the output shaft of the stepper motor 1 and the threaded sleeve 4 is designed to be greater than the opening and closing stroke of the energy storage spring 8 to ensure that the opening and closing operation is not affected.

[0032] A one-way bearing is also provided inside the stepper motor 1. By designing a one-way bearing inside the stepper motor 1, it is ensured that the threaded sleeve 4 does not rotate in the reverse direction, and the problem of a decrease in the spring force value of the threaded sleeve 4 due to loosening of the thread can be avoided.

[0033] The length of the guide keyway on the threaded sleeve 4 is greater than the normal opening and closing compression stroke of the energy storage spring 8. The length of the guide keyway on the threaded sleeve 4 is designed to be greater than the normal opening and closing compression stroke of the energy storage spring 8 to ensure that no collision occurs between the motor output shaft and the threaded sleeve 4 during normal opening and closing operations.

[0034] A control unit, the control unit includes a data acquisition module and an intelligent monitoring module. The data acquisition module is connected to the pressure sensor 10, and converts the data signal detected by the pressure sensor 10 and uploads it to the intelligent monitoring module. The intelligent monitoring module is connected to the data acquisition module and the stepper motor 1, and controls the action of the stepper motor 1 according to the data from the data acquisition module.

[0035] The method for adjusting the self-adjusting system comprises the following steps:

[0036] S1: First, the pressure sensor 10 monitors the pressure change of the energy storage spring 8 in real time, and feeds back the monitoring value to the data acquisition module, and then enters step S2.

[0037] S2: The data acquisition module converts the data monitored by the pressure sensor 10, and transmits the converted data to the intelligent monitoring module, and then enters step S3.

[0038] S3: After receiving the data transmitted from the data acquisition module, the intelligent monitoring module compares the monitored data with the threshold set in advance inside the intelligent monitoring module. If the monitored data reaches the set threshold, it goes to step S4; if the monitored data does not reach the set threshold, it goes to step S2.

[0039] S4: The intelligent monitoring module outputs an electric pulse signal to drive the stepper motor to work, and the stepper motor 1 drives the threaded sleeve 4 to rotate a step angle to increase the spring compression of the energy storage spring 8, and returns to step S2 after the stepper motor 1 is activated.

[0040] S5: Adjustment completed.

[0041] The self-adjusting system of the present invention can drive the opening and closing energy storage springs to automatically adjust through the cooperation of an additional stepper motor 1 and a threaded sleeve 4. When the spring pressure drops to a set threshold, the intelligent monitoring module sends an electric pulse signal to drive the stepper motor to rotate a set step angle. This solution automatically increases the spring compression to compensate for the decrease in spring force caused by spring weakness. In this way, the line can compensate for the decrease in spring force in real time without power outage, greatly reducing the risk of product operation. This is an industry first.

[0042] The added stepper motor 1 is linked to the opening and closing spring fastening nut, and a one-way bearing is added to the motor itself, so the motor will not rotate in the opposite direction. This can completely avoid the problem of loosening of the spring fastening nut and reduce the opening and closing abnormalities caused by changes in the compression of the energy storage spring due to loose threads.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A circuit breaker operating mechanism energy storage spring self-adjusting system, wherein the energy storage spring is arranged in the operating mechanism box of the circuit breaker, and the energy storage spring is installed in a spring cylinder, characterized in that: Self-adjusting system includes A pressure sensor installed in the spring barrel, the pressure sensor abuts against one side of the energy storage spring, and the other side of the energy storage spring abuts against a spring pressure plate. A spring pull rod is also arranged in the spring barrel, the spring pull rod is located at the center of the energy storage spring, and the two sides of the spring pull rod extend from the two sides of the spring barrel respectively. The spring pull rod is fixed to the spring pressure plate and drives the spring pressure plate to translate in the spring barrel, thereby realizing compression energy storage of the energy storage spring; A stepper motor is arranged outside the spring tube, the stepper motor is connected to the spring pull rod and drives the spring pull rod to move back and forth; The stepper motor is connected to the spring pull rod through the cooperation of the threaded sleeve, and the output shaft of the stepper motor is connected to the threaded sleeve through the cooperation of the guide flat key. The threaded sleeve is provided with a guide key groove for the guide flat key to be embedded. The designed guide idle stroke between the output shaft of the stepping motor and the threaded sleeve is greater than the opening and closing stroke of the energy storage spring; The length of the guide keyway on the threaded sleeve is greater than the opening and closing stroke of the energy storage spring; A control unit, the control unit includes a data acquisition module and an intelligent monitoring module, the data acquisition module is connected to the pressure sensor, and converts the data signal detected by the pressure sensor and uploads it to the intelligent monitoring module, the intelligent monitoring module is connected to the data acquisition module and the stepper motor, and controls the stepper motor according to the data of the data acquisition module; The adjustment method of the self-adjusting system comprises the following steps: S1: First, the pressure sensor monitors the pressure change of the energy storage spring in real time, and feeds the monitoring value back to the data acquisition module, and then enters step S2; S2: The data acquisition module converts the data monitored by the pressure sensor and transmits the converted data to the intelligent monitoring module, and then enters step S3: S3: After receiving the data transmitted from the data acquisition module, the intelligent monitoring module compares the monitored data with the threshold value set in advance inside the intelligent monitoring module. If the monitored data reaches the set threshold value, it goes to step S4; if the monitored data does not reach the set threshold value, it goes to step S2; S4: The intelligent monitoring module outputs an electric pulse signal to drive the stepper motor to work, and the stepper motor drives the threaded sleeve to rotate a step angle to increase the spring compression of the energy storage spring, and returns to step S2 after the stepper motor is activated; S5: Adjustment completed.

2. The circuit breaker operating mechanism energy storage spring self-adjusting system according to claim 1, characterized in that: A one-way bearing is also arranged inside the stepping motor.

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