Opening spring assembly for high-power circuit breaker

Abstract

According to the switching-off spring assembly for the high-power circuit breaker, a positioning assembly arranged on a supporting seat is adaptively connected with the lower end of a switching-off double spring sleeved on a guide rod, and a pre-tightening pad group above the switching-off double spring is sleeved on a screw rod section at the upper end of the guide rod; the pre-pressure of the opening double spring is adjusted through a nut which is in adaptive connection with the screw rod section of the guide rod and abuts against the pre-tightening pad group. The lower end of the connector is hinged to one end of a crank arm through a pin shaft, the middle of the crank arm is fixed to the main shaft, and the other end of the crank arm corresponds to the elastic contact in position. According to the utility model, the opening spring assembly structure is optimized, and the opening double-spring structure is adopted, so that the structure is simple, the transmission is clear, the problem that the circuit breaker cannot be smoothly and effectively powered off due to small opening force in the traditional structure is solved, the maximum effective power of the opening double springs is exerted, the opening force of the opening spring structure is greatly improved, the opening output power is ensured, and the service life of the circuit breaker is prolonged. Transmission links are reduced, the assembly efficiency is improved, and the purchase economic cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to circuit breaker equipment technical field, concretely relates to a tripping spring assembly for high-power circuit breaker. BACKGROUND

[0002] High-voltage circuit breaker undertakes the heavy responsibility of overload, short-circuit protection and control of power equipment in high-voltage power distribution system. The successful tripping of circuit breaker becomes the key link in power system, and a reliable tripping system is essential. It not only needs to provide enough separation force, but also needs to ensure the safety and reliability in the separation process, and the transmission link must be reduced. At present, the tripping spring mainly realizes the function, and other aspects are secondary, so various types of tripping spring assemblies appear, which have the following shortcomings: ① the number of tripping springs is too dispersed, the assembly is complicated, and special tooling is required for assembly of individual process; ② when the same type of mechanism is used at different currents, the tripping spring is selected in various ways, and the combination type is various, which is easy to cause misplacement and increase the rework in later period; ③ too many parts also increase the procurement cost; in the patent No. 200910090672.5 and the patent name "an electric switch with an arc extinguishing device" (hereinafter referred to as the comparative document), a tripping spring structure is disclosed, which comprises a tripping spring crank arm 119 mounted on a rotating shaft 115. The tripping spring crank arm 119, the tripping pull rod 128 and the nut 129 are connected together from back to front, the tripping spring 130 is sleeved on the tripping pull rod 128, the tripping spring guide pipe 127 and the tripping pull rod guide pipe 125 are cylindrical sleeves for guiding the tripping spring and the tripping pull rod 128, and the tripping pull rod guide pipe support 140 is a bent plate welded on the base frame 101 on one side. When tripping, the tripping pull rod 128 is pulled, and the tripping pull rod guide pipe support 140 can block the tripping spring 130, so as to compress the tripping spring 130 and generate a buffering effect. Although the above structure can solve the above defects of various tripping spring assemblies, the tripping spring structure in the comparative document is only suitable for the use requirement of small-power circuit breaker. If it is used in high-power circuit breaker, the tripping force of the tripping spring structure is small, so that the tripping output power cannot meet the requirement of effectively separating the arc chamber, thereby causing the circuit breaker to fail to be effectively powered off, which affects the normal use. Therefore, it is necessary to improve the above problems. CONTENT OF THE UTILITY MODEL

[0003] The utility model solves the technical problem: provide a tripping spring assembly for high-power circuit breaker, through optimizing tripping spring assembly structure, and adopting tripping double spring structure, simple structure clear transmission, solve the problem that the circuit breaker cannot be effectively powered off because of the small tripping force of the traditional structure, the maximum effective power of tripping double spring is developed, the tripping force of the tripping spring structure is greatly improved, the tripping output power is ensured, the transmission link is reduced, the assembly efficiency is improved, and the procurement economic cost is reduced.

[0004] The utility model discloses a technical scheme: high -power circuit breaker is with opening spring subassembly, including fixed in the support seat on the inside wall of circuit breaker casing, the positioning assembly of setting on the support seat is connected with the lower end of opening double spring of being suitably dressed on the guide rod, the pre -tightening pad group of the upper of opening double spring is suitably dressed on the screw rod section of guide rod upper end, and the pre -pressure of opening double spring is adjusted through the nut of being suitably connected with guide rod screw rod section and being resisted on pre -tightening pad group, the lower end of guide rod is fixedly connected with the upper end of connector through the support seat, the lower end of connector is hinged with the one end of crank arm of being fixed on the main shaft through the pin, and the other end of crank arm is correspondingly arranged with elastic contact position, and when the other end of crank arm is separated from elastic contact under the clockwise rotation of main shaft and through the downward pull of guide rod by crank arm, realizes the compression energy storage of opening double spring, and the elastic contact is up, completes the closing, or when the pressure of opening double spring is released, through the anticlockwise rotation of main shaft when the crank arm is driven, makes the other end of crank arm press down the elastic contact and completes the opening.

[0005] Wherein, the opening double spring includes opening outer compression spring and opening inner compression spring, the opening inner compression spring is suitably dressed in the opening outer compression spring, and the guide rod is arranged through the opening inner compression spring, the lower end of opening outer compression spring and opening inner compression spring is adaptively positioned with the positioning assembly on the end face of support seat.

[0006] Further, the length of the opening outer compression spring is greater than the length of the opening inner compression spring, and the upper end of the opening outer compression spring is in adaptive contact with the bottom of the pre-tightening pad group.

[0007] Further, the positioning assembly includes a guide sleeve, the guide sleeve is a stepped sleeve formed by a large diameter section and a small diameter section, the lower end of the guide sleeve is located on the upper end face of the lower pad bowl, the lower end of the opening outer compression spring is adaptively fitted on the large diameter section of the guide sleeve and abuts on the lower pad bowl, and the lower end of the opening inner compression spring is fitted on the small diameter section of the guide sleeve and abuts on the step face formed by the large diameter section and the small diameter section, the lower end of the guide rod is arranged through the guide sleeve, the lower pad bowl, and the support seat.

[0008] Further, the pre-tightening pad group includes a flat pad suitably dressed on the upper end of the guide rod and an upper pad bowl located at the lower end of the flat pad, the upper pad bowl is arranged with the bowl mouth downward, and the upper end of the opening outer compression spring is adaptively in the upper pad bowl, the nut abuts on the flat pad, and the position of the nut on the upper end of the guide rod is adjusted by rotating the nut, to realize the adjustment of the pre-pressure of the opening double spring.

[0009] Further, the support seat is a U-shaped seat structure made of a bottom plate and vertical plates fixed on both sides of the bottom plate, and the lower end of the opening double spring is located in the support seat with a length of not less than 1 / 3.

[0010] The utility model discloses the advantages compared with prior art:

[0011] 1. The technical scheme optimizes the structure of the opening spring assembly, adopts the opening double spring structure, has simple structure and clear transmission, solves the problem that the circuit breaker cannot be smoothly and effectively powered off due to small opening force of the traditional structure, maximizes the effective power of the opening double spring, greatly improves the opening force of the opening spring structure, and ensures the opening output power;

[0012] 2. The technical scheme adopts the opening outer compression spring and opening inner compression spring structure which are set in a set, is convenient and fast to assemble and position, has concentrated installation position, fully utilizes the combined force of the two, improves the opening force of the opening double spring, increases the opening force range, and directly acts the energy released by the opening double spring on the rotating main shaft, maximizes the effective output power of the opening double spring, and meets the reliable opening requirements of the high-power circuit breaker;

[0013] 3. The technical scheme has reasonable structure design, reduces the number of parts and transmission links, improves the assembly efficiency, reduces the procurement economic cost, increases the service life of the spring, and provides diversity for the mechanism adapted to various places. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a structure front view of the utility model;

[0015] Fig. 2 It is a structure right view of the utility model;

[0016] Fig. 3 It is a closing state schematic view of the utility model. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiments of the utility model will be clearly and completely described below, Figs. 1-3 It is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0018] It should be noted that in this paper, unless otherwise stated, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the invention. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0019] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0020] High-power circuit breaker trip spring assemblies, such as Figs. 1-3 As shown, the circuit breaker includes a support base 5 fixed to the inner wall of the circuit breaker housing. A positioning component on the support base 5 is adapted to the lower end of the tripping double spring fitted on the guide rod 7. A preload pad assembly above the tripping double spring is fitted onto the screw section at the upper end of the guide rod 7, and the preload of the tripping double spring is adjusted by a nut 1 adapted to the screw section of the guide rod 7 and abutting against the preload pad assembly. The lower end of the guide rod 7 passes through the support base 5 and is fixedly connected to the upper end of the connector 8. The lower end of the connector 8 is hinged to one end of a crank arm 10 fixed to the main shaft 11 in the middle via a pin 9, and the other end of the crank arm 10 is positioned corresponding to the position of the elastic contact 14 and rotates clockwise on the main shaft 11. When the guide rod 7 is pulled down by the crank arm 10, causing the other end of the crank arm 10 to separate from the elastic contact, the elastic contact 14 moves upward to complete the closing while the double spring is compressed and stored. Alternatively, when the double spring releases pressure, the main shaft 11 is rotated counterclockwise by the crank arm 10, causing the other end of the crank arm 10 to press down against the elastic contact 14 to complete the opening. In the above structure, by optimizing the structure of the opening spring assembly and adopting the double spring structure, the structure is simple and the transmission is clear. It solves the problem that the circuit breaker cannot disconnect power smoothly and effectively due to the small opening force in the traditional structure, maximizes the effective power of the double spring, greatly improves the opening force of the opening spring structure, and ensures the opening output power.

[0021] The specific structure of the split double spring is as follows: the split double spring comprises a split outer compression spring 4 and a split inner compression spring 12, the split inner compression spring 12 is sleeved in the split outer compression spring 4, a guide rod 7 is arranged through the split inner compression spring 12, and the lower ends of the split outer compression spring 4 and the split inner compression spring 12 are adaptively positioned with a positioning assembly on the end face of a support base 5; specifically, the length of the split outer compression spring 4 is greater than the length of the split inner compression spring 12, and the upper end of the split outer compression spring 4 is adaptively in contact with the bottom of a pre-tightening pad group; in the above structure, the split outer compression spring 4 and the split inner compression spring 5 are arranged in a sleeving mode, the assembly and positioning are convenient and fast, the installation position is concentrated, the combined force of the two is fully utilized, the split force of the split double spring is improved, the split force range is increased, the energy released by the split double spring directly acts on the rotating main shaft 11, the maximum effective output work of the split double spring is exerted, the smooth and reliable power-off of the arc extinguishing chamber of the high-power circuit breaker is ensured, and the reliable split requirement of the high-power circuit breaker is met.

[0022] The specific structure of the positioning assembly is as follows: the positioning assembly comprises a guide sleeve 6, the guide sleeve 6 is a stepped sleeve formed by a large-diameter section and a small-diameter section, a lower pad bowl 13 with a bowl opening upward is arranged at the position of the long hole on the end face of the support base 5, and the guide sleeve 6 is located on the upper end face of the lower pad bowl 13, the lower end of the split outer compression spring 4 is adaptively sleeved on the large-diameter section of the guide sleeve 6 and abuts against the lower pad bowl 13, and the lower end of the split inner compression spring 12 is sleeved on the small-diameter section of the guide sleeve 6 and abuts against the step face formed by the large-diameter section and the small-diameter section, and the lower end of the guide rod 7 is arranged to pass through the guide sleeve 6, the lower pad bowl 13 and the support base 5.

[0023] The specific structure of the pre-tightening pad group is as follows: the pre-tightening pad group comprises a flat pad 2 sleeved on the upper end of the guide rod 7 and an upper pad bowl 3 located at the lower end of the flat pad 2, the upper pad bowl 3 is arranged with a bowl opening downward, and the upper end of the split outer compression spring 4 is adaptively in the upper pad bowl 3, the nut 1 abuts against the flat pad 2, and the position of the nut 1 on the upper end of the guide rod 7 is adjusted by rotating the nut 1, so that the split double spring pre-pressure is adjusted.

[0024] The support base 5 is in a U-shaped seat structure made of a bottom plate and vertical plates fixed on both sides of the bottom plate, and the lower end of the split double spring is not less than 1 / 3 of the length in the support base 5, the setting structure provides stable and reliable support conditions for the split double spring, and the vertical plates on both sides of the bottom plate of the support base 5 improve the structural strength of the support base 5.

[0025] When the circuit breaker is to be closed, the main shaft 11 rotates clockwise to drive the crank arm 10 to pull the guide rod 7 on the connecting head 8 downward along the guide sleeve 6 under the action of the upper pad bowl 3 and the lower pad bowl 13, so that the split outer compression spring 4 and the split inner compression spring 5 are compressed to store energy, and the other end of the crank arm 10 is separated from the elastic contact 14 to complete the closing, wherein the specific closing structure is the existing structure, which is not described here.

[0026] Conversely, when the circuit breaker is to be opened: the opening outer compression spring 4 and the opening inner compression spring 5 release the pressure through the upper pad bowl 3 and the lower pad bowl 13 at both ends to pull the guide rod 7 along the guide sleeve 6 to move the crank arm 10 upward, drive the main shaft 11 to rotate counterclockwise, and press the elastic contact 14 to complete opening. The nut 1 can adjust the pre-pressure of the opening double spring according to the size of the closing force of different mechanisms to increase the adaptability.

[0027] The adjustable opening spring assembly has simple structure, adjustable characteristics, can be adapted to various circuit breaker mechanisms, has few components, high assembly efficiency, reduces the working strength and working pressure of the operator, improves the performance of the product, saves certain economic cost, and provides diversity for adapting to mechanisms in various places.

[0028] The technical scheme has reasonable structure, reduces the number of components, reduces the transmission links, improves the assembly efficiency, reduces the procurement economic cost, increases the service life of the spring, provides diversity for adapting to mechanisms in various places.

[0029] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0030] In addition, it should be understood that although the present application is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A tripping spring assembly for a high power circuit breaker, characterized by: The application relates to a circuit breaker, which comprises a support seat (5) fixed to the inner side wall of the circuit breaker shell, a positioning assembly arranged on the support seat (5) is adaptedly connected with the lower end of a split spring double spring sleeved on a guide rod (7), a pre-tightening pad set arranged above the split spring double spring is sleeved on the screw rod section of the upper end of the guide rod (7), and the pre-pressure of the split spring double spring is adjusted by a nut (1) which is adaptedly connected with the screw rod section of the guide rod (7) and abuts against the pre-tightening pad set; the lower end of the guide rod (7) is fixedly connected with the upper end of a connecting head (8) through the support seat (5), the lower end of the connecting head (8) is hingedly connected with one end of a crank arm (10) which is fixedly arranged on a main shaft (11) through a pin shaft (9), the other end of the crank arm (10) is arranged in position correspondence with an elastic contact (14), and when the main shaft (11) rotates clockwise to pull down the guide rod (7) through the crank arm (10) to separate the other end of the crank arm (10) from the elastic contact, the split spring double spring is compressed and stored energy, and the elastic contact (14) is lifted to complete closing, or when the split spring double spring releases pressure, the crank arm (10) drives the main shaft (11) to rotate counterclockwise to make the other end of the crank arm (10) press down the elastic contact (14) to complete opening.

2. The opening spring assembly for a high power circuit breaker of claim 1, wherein: The split spring double spring comprises a split outer compression spring (4) and a split inner compression spring (12), the split inner compression spring (12) is sleeved in the split outer compression spring (4), and the guide rod (7) passes through the split inner compression spring (12), and the lower ends of the split outer compression spring (4) and the split inner compression spring (12) are adaptively positioned with the positioning assembly on the end face of the support seat (5).

3. The opening spring assembly for a high power circuit breaker of claim 2, wherein: The length of the split outer compression spring (4) is greater than that of the split inner compression spring (12), and the upper end of the split outer compression spring (4) is adaptively contacted with the bottom of the pre-tightening pad set.

4. The opening spring assembly for a high power circuit breaker of claim 3, wherein: The positioning assembly comprises a guide sleeve (6), the guide sleeve (6) is a stepped sleeve formed by a large-diameter section and a small-diameter section, the long hole on the end face of the support seat (5) is provided with a lower pad bowl (13) with a bowl opening upward, and the guide sleeve (6) is located on the upper end face of the lower pad bowl (13), the lower end of the split outer compression spring (4) is adaptively sleeved on the large-diameter section of the guide sleeve (6) and abuts against the lower pad bowl (13), and the lower end of the split inner compression spring (12) is sleeved on the small-diameter section of the guide sleeve (6) and abuts against the stepped face formed by the large-diameter section and the small-diameter section, and the lower end of the guide rod (7) passes through the guide sleeve (6), the lower pad bowl (13) and the support seat (5).

5. The opening spring assembly for a high power circuit breaker of claim 4, wherein: The pre-tightening pad set comprises a flat pad (2) sleeved on the upper end of the guide rod (7) and an upper pad bowl (3) located at the lower end of the flat pad (2), the bowl opening of the upper pad bowl (3) is downward, the upper end of the split outer compression spring (4) is adaptedly arranged in the upper pad bowl (3), the nut (1) abuts against the flat pad (2), and the position of the nut (1) on the upper end of the guide rod (7) is adjusted by rotating the nut (1), so that the pre-pressure of the split spring double spring is adjusted.

6. The opening spring assembly for high power circuit breakers according to any of claims 1-5, characterized in that: The support seat (5) is a U-shaped seat structure made of a bottom plate and vertical plates fixed on both sides of the bottom plate, and the lower end of the split spring double spring is located in the support seat (5) with a length not less than 1 / 3.

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