CN101834090A - Cam matched with load property of 126kV vacuum circuit breaker - Google Patents

Abstract

The invention discloses a cam matching the load characteristics of a 126kV vacuum circuit breaker. The radius of the base circle of the cam is 38mm; The angular range of 40°-60° moves to the angular range of 90°-115°, corresponding to the mechanism starting to compress the contact spring, the output torque in this process is between 60-84mm in the total stroke, and the driving torque is always as high as that of a vacuum circuit breaker The characteristic curve of load moment does not exceed 2500N·mm. The cam used for the 126kV vacuum circuit breaker of the present invention can improve the transmission characteristics of the mechanism, thereby improving the operating performance of the operating mechanism, and improving the service reliability and service life of the vacuum circuit breaker.

Description

A Cam Matching the Load Characteristics of 126kV Vacuum Circuit Breaker

technical field

The invention belongs to the field of electric equipment, and relates to a circuit breaker device, in particular to a cam matching the load characteristics of a 126kV vacuum circuit breaker.

Background technique

The spring operating mechanism for 126kV circuit breakers is usually composed of a cam-link mechanism, and the existing spring operating mechanisms are all compatible with the load characteristics of SF6 circuit breakers. Due to the function of the contact spring, the load characteristics of the vacuum circuit breaker are quite different from those of the SF6 circuit breaker. If the existing spring operating mechanism is directly matched with the vacuum circuit breaker, the closing speed will be too high, the bounce will be too large, and the closing will not be successful. .

SUMMARY OF THE INVENTION The present invention provides a cam applicable to a 126kV vacuum circuit breaker. The cam can improve the transmission characteristics of the mechanism, thereby improving the operating performance of the operating mechanism and improving the reliability and life of the vacuum circuit breaker.

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a cam that matches the load characteristics of a 126kV vacuum circuit breaker. The point 1 to point 2 on the cam profile is the working area 13 of the cam, and the roller 14 is in the working area 13 along the The direction D and the cam 3 are in contact with each other, the contact point 1 is the starting point of the working area 13, and the contact point 2 is the ending point of the working area 13; from the contact point 1 in the counterclockwise direction D0°-10° angle range 5, the cam All contact points on the contour line are within the circle centered on the center of the cam base circle 4, with an outer diameter of 45 mm and an inner diameter of 38 mm; from the contact point 1 in the counterclockwise direction D10°-20° angle range 6, the cam contour line All contact points above are within the circle centered on the center of the cam base circle 4, with an outer diameter of 54mm and an inner diameter of 44mm; from the contact point 1 in the counterclockwise direction D20°-30° angle range 7, all on the cam contour line The contact points are all within the circle centered on the center of the cam base circle 4, with an outer diameter of 65mm and an inner diameter of 50mm; from the contact point 1 in the counterclockwise direction D40°-60° angle range 8, all contact points on the cam contour line They are all within the circle centered on the base circle center 4 of the cam, with an outer diameter of 75 mm and an inner diameter of 60 mm; from the contact point 1 in the counterclockwise direction D40°-60° angle range 9, all contact points on the cam contour line are within With the base circle center 4 of the cam as the center, the outer diameter is 85mm, and the inner diameter is 70mm within the circle range; from the contact point 1 along the counterclockwise direction D60°-90° angle range 10, all the contact points on the cam contour line are within the cam The base circle center 4 is the center of the circle, with an outer diameter of 93mm and an inner diameter of 80mm; from the contact point 1 in the counterclockwise direction D90°-115° angle range 11, all contact points on the cam contour line are within the cam base circle The center 4 is the center of the circle, with an outer diameter of 97mm and an inner diameter of 90mm; from the contact point 1 in the counterclockwise direction D115°-140° angle range 12, all contact points on the cam contour line are at the center of the cam base circle 4 is the center of the circle, with an outer diameter of 97mm and an inner diameter of 93mm; all the contact points in the above-mentioned working area 13 are monotonously increasing in the distance from the starting point 1 to the ending point 2 along the counterclockwise direction D to the center 4 of the cam base circle ; The contact point between the cam and the roller moves from the angle range 6 of 10°-20° to the angle range 7 of 20°-30°, and the corresponding moving contact moves from the beginning of the action to the contact just closing, and the output torque in the process is The total stroke is between 0-50mm, and the driving torque is higher than the load torque characteristic curve of the vacuum circuit breaker in the range of 50N·mm to 500N·mm.

The contact point between the cam and the roller moves from the 40°-60° angle range 8 to the 60°-90° angle range 10, corresponding to the mechanism starting to compress the contact spring, and the output torque in this process satisfies the total stroke within 60-84mm. During the period, the driving torque is always high and the load torque characteristic curve of the vacuum circuit breaker does not exceed 2500N·mm.

When the contact point between the cam and the roller moves within the angular range of 90°-115°, it corresponds to the working period of the closing lock of the mechanism; the distance from the contact point to the center of the cam increases between 93mm and 97mm, so that the closing is reset The time difference is not less than 2ms. The cam used for the 126kV vacuum circuit breaker of the present invention can improve the transmission characteristics of the mechanism, thereby improving the operating performance of the operating mechanism, and improving the service reliability and service life of the vacuum circuit breaker.

Description of drawings

Fig. 1 is a schematic diagram of the cam profile structure of the present invention; Fig. 2 is a characteristic curve diagram of each torque and contact stroke of the cam of the present invention on the main shaft; wherein: 1 is the starting point of the cam working area, and 2 is the position of the cam working area End point, 3 is the cam, 4 is the center of the base circle of the cam, 5 to 12 is the range of each section in the working area, 13 is the working area of the cam, 14 is the roller, 15 is the output torque curve of the designed cam, 16 is 126kV Load curves for vacuum circuit breakers.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings: Referring to Figure 1, a cam matching the load characteristics of a 126kV vacuum circuit breaker, the point 1 to point 2 on the cam profile is the working area 13 of the cam, and the roller 14 is in the working area 13 Interact with the cam 3 along the direction D, the contact point 1 is the starting point of the working area 13, and the contact point 2 is the ending point of the working area 13; from the contact point 1 in the counterclockwise direction D0°-10° angle range 5, All contact points on the cam contour line are within the circle centered on the base circle center 4 of the cam, with an outer diameter of 45 mm and an inner diameter of 38 mm; from the contact point 1 in the counterclockwise direction D10°-20° angle range 6, the cam contour All contact points on the line are within the circle centered on the center of the cam base circle 4, with an outer diameter of 54mm and an inner diameter of 44mm; from the contact point 1 along the counterclockwise direction D20°-30° angle range 7, on the cam contour line All contact points are within the circle centered on the center of the cam base circle 4, with an outer diameter of 65mm and an inner diameter of 50mm; from the contact point 1 along the counterclockwise direction D40°-60° angle range 8, all contacts on the cam contour line The points are all within the circle centered on the base circle center 4 of the cam, with an outer diameter of 75 mm and an inner diameter of 60 mm; from the contact point 1 in the counterclockwise direction D40°-60° angle range 9, all contact points on the cam contour line are In the circle centered on the base circle center 4 of the cam, with an outer diameter of 85mm and an inner diameter of 70mm; from the contact point 1 in the counterclockwise direction D60°-90° angle range 10, all the contact points on the cam contour line are in the range of The base circle center 4 of the cam is the center of the circle, with an outer diameter of 93mm and an inner diameter of 80mm; from the contact point 1 along the counterclockwise direction D90°-115° angle range 11, all contact points on the cam contour line are within the range of the cam base circle. The circle center 4 is the center of the circle, with an outer diameter of 97mm and an inner diameter of 90mm; from the contact point 1 in the counterclockwise direction D115°-140° angle range 12, all contact points on the cam contour line are at the center of the cam base circle 4 is the center of the circle, with an outer diameter of 97mm and an inner diameter of 93mm; all the contact points in the above-mentioned working area 13 are monotonous in the distance from the starting point 1 to the ending point 2 along the counterclockwise direction D to the center 4 of the cam base circle Incremental; the contact point between the cam and the roller moves from the angle range 6 of 10°-20° to the angle range 7 of 20°-30°, and the corresponding moving contact moves from the beginning of the action to the contact just closing, the output torque during this process Between the total stroke of 0-50mm, the driving torque is higher than the load torque characteristic curve of the vacuum circuit breaker in the range of 50N·mm to 500N·mm.

The contact point between the cam and the roller moves from the 40°-60° angle range 8 to the 60°-90° angle range 10, corresponding to the mechanism starting to compress the contact spring, and the output torque in this process satisfies the total stroke within 60-84mm. During the period, the driving torque is always high and the load torque characteristic curve of the vacuum circuit breaker does not exceed 2500N·mm.

When the contact point between the cam and the roller moves within the angular range of 90°-115°, it corresponds to the working period of the closing lock of the mechanism; the distance from the contact point to the center of the cam increases between 93mm and 97mm, so that the closing is reset The time difference is not less than 2ms.

The contact points on the cam working area are represented by the coordinates corresponding to the cam base circle as the origin, input into the CNC machine tool for processing and preparation of the cam working area, and the number of input contact points should be no less than 30. The cam is installed on the spring operating mechanism of the 126kV vacuum circuit breaker, and is the most critical part in the closing process of the circuit breaker.

As shown in Figure 2, in order to reduce the operating work of the closing spring, by designing a new output force characteristic curve 15, the curve satisfies the load moment characteristic curve 16 that is higher than the 126kV vacuum circuit breaker during the full opening distance and is not greater than 2000N·mm, and the driving torque 15 is higher than the load moment characteristic curve 16 of the 126kV vacuum circuit breaker between the stroke 0-50mm, and the load moment characteristic curve 16 is between 50N·mm and 500N·mm, which is achieved with less energy during the mechanism stroke 60mm opening distance Appropriate average closing speed effectively reduces the closing bounce, and increases the output torque during the energy storage process of the contact spring, so that the mechanism can easily overcome the resistance of the contact spring. At the end position of closing, the overshoot time of closing should be increased as much as possible, so as to improve the reset time of the closing latch of the mechanism and improve the reliability of closing. According to the cam profile (Fig. 1) designed by the output force characteristic curve, the cam can reasonably distribute the energy of the closing spring in each closing process, enabling the circuit breaker to achieve a suitable average closing with less energy. The speed of the brake can effectively reduce the closing bounce, and the output torque is increased during the energy storage process of the contact spring, so that the mechanism can easily overcome the resistance of the contact spring and ensure the reliability of closing.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the circumstances, some simple deduction or replacement can also be made, all of which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims (4)

1. A cam matching the load characteristics of a 126kV vacuum circuit breaker, characterized in that: the point (1) to point (2) on the cam profile is the working area (13) of the cam, and the roller (14) is in the working area (13) The inner direction (D) is in contact with the cam (3), the contact point (1) is the starting point of the working area (13), and the contact point (2) is the ending point of the working area (13); From the contact point (1) along the counterclockwise direction (D) within the angle range (5) of 0°-10°, all contact points on the cam contour line are centered on the center of the cam base circle (4), with an outer diameter of 45mm and an inner diameter of Within the range of 38mm circle; From the contact point (1) along the counterclockwise direction (D) within the angle range (6) of 10°-20°, all contact points on the cam contour line are centered on the center of the cam base circle (4), with an outer diameter of 54mm and an inner diameter of Within the range of 44mm circle; From the contact point (1) along the counterclockwise direction (D) within the angle range (7) of 20°-30°, all contact points on the cam contour line are centered on the center of the cam base circle (4), with an outer diameter of 65mm and an inner diameter of Within the range of 50mm circle; From the contact point (1) along the counterclockwise direction (D) within the angle range (8) of 40°-60°, all contact points on the cam contour line are centered on the center of the cam base circle (4), with an outer diameter of 75mm and an inner diameter of Within the range of 60mm circle; From the contact point (1) along the counterclockwise direction (D) within the angle range (9) of 40°-60°, all contact points on the cam contour line are centered on the center of the cam base circle (4), with an outer diameter of 85mm and an inner diameter of Within the range of 70mm circle; From the contact point (1) along the counterclockwise direction (D) within the angle range (10) of 60°-90°, all contact points on the cam contour line are centered on the center of the cam base circle (4), with an outer diameter of 93mm and an inner diameter of Within the range of 80mm circle; From the contact point (1) in the counterclockwise direction (D) within the angle range (11) of 90°-115°, all contact points on the cam contour line are centered on the center of the cam base circle (4), with an outer diameter of 97mm and an inner diameter of Within the range of 90mm circle; From the contact point (1) along the counterclockwise direction (D) within the angle range (12) of 115°-140°, all contact points on the cam contour line are centered on the center of the cam base circle (4), with an outer diameter of 97mm and an inner diameter of Within the range of 93mm circle; The distances from the contact points in all the above-mentioned working areas (13) to the center of the cam base circle (4) in the counterclockwise direction (D) monotonically increase within the range from the starting point (1) to the ending point (2). 2. A cam matching the load characteristics of a 126kV vacuum circuit breaker as claimed in claim 1, wherein the contact point between the cam and the roller moves from an angle range (6) of 10°-20° to an angle of 20°-30° Range (7), the corresponding moving contact moves from the start of movement to the contact just closing, the output torque in the process is between 0-50mm in the total stroke, and the driving torque is higher than the load torque characteristic curve of the vacuum circuit breaker at 50N· mm to 500N·mm. 3. A cam matching the load characteristics of a 126kV vacuum circuit breaker as claimed in claim 1, characterized in that: the contact point between the cam and the roller moves from the angle range (8) of 40°-60° to the angle of 60°-90° The range (10) corresponds to the mechanism starting to compress the contact spring, the output torque in this process satisfies the total stroke between 60-84mm, the driving torque is always high and the load torque characteristic curve of the vacuum circuit breaker does not exceed 2500N·mm. 4. A cam matching the load characteristics of a 126kV vacuum circuit breaker as claimed in claim 1, characterized in that: when the contact point between the cam and the roller moves within the angle range (11) of 90°-115°, it corresponds to the During the working period of the closing lock; the distance from the contact point to the center of the cam is gradually increased between 93mm and 97mm, so that the closing reset time difference is not less than 2ms.

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