Opening and closing mechanism for vacuum circuit breaker

Abstract

A switching-on and switching-off mechanism for a vacuum circuit breaker comprises a plurality of switching-on connecting levers which are rotatably arranged on a frame, and the centers of rotating shafts of the switching-on connecting levers are located on the same straight line; the connecting plates are respectively connected with the upper ends of the closing crank arms; one end of each opening spring is fixedly connected with the connecting plate, and the other end of each opening spring is fixedly connected with the frame; one end of the connecting rod is in linkage fit with the middle section of one closing crank arm, and the other end of the connecting rod is in linkage connection with the operation main shaft; the lower end of the over-travel pull rod is rotatably matched with the SMC connecting lever of the solid-sealed polar pole, the upper end of the over-travel pull rod is in linkage fit with the lower end of the closing connecting lever, the closing connecting levers are linked through the connecting plate, so that the closing connecting levers swing relatively and do not need to be directly connected with the operation main shaft, and the length of the whole operation main shaft is shortened; and the closing crank arm can be directly driven to act through the connecting rod, so that the operation is simple, a large amount of space is saved, the size of the whole vacuum circuit breaker can be reduced, the operating mechanism is designed to be more miniaturized, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the field of vacuum circuit breakers, and particularly relates to a closing and opening mechanism for a vacuum circuit breaker. Background Art

[0002] A vacuum circuit breaker is a circuit breaker that uses vacuum as the insulation and arc extinguishing medium between the contacts. Because of its advantages of small volume and light weight, it is widely used in the distribution network. Many industrial and mining enterprises, power plants, and substations use vacuum circuit breakers for the protection and control of electrical equipment.

[0003] It has the functions of closing and opening, that is, it is provided with a corresponding closing and opening operating mechanism to drive the solid-sealed pole column to perform closing and opening actions. For a conventional closing and opening operating mechanism such as Chinese Patent CN220691921U, it specifically discloses a vacuum circuit breaker operating mechanism, which drives the crank arm linked with it through the main shaft to realize the closing and opening operations. This method requires the setting of a main shaft that runs through the entire frame. At the same time, when it drives the crank arm to rotate, it will cause a relatively large overall movement stroke, thereby increasing the volume of the entire vacuum circuit breaker and being not conducive to miniaturized design. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a closing and opening mechanism for a vacuum circuit breaker.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A closing and opening mechanism for a vacuum circuit breaker, comprising:

[0007] A plurality of closing crank arms rotatably arranged on the frame, and the axis centers of the respective closing crank arms are located on the same straight line;

[0008] A connecting plate, which is respectively connected to the upper ends of the closing crank arms;

[0009] A plurality of opening springs, one end of which is fixedly connected to the connecting plate, and the other end of which is fixedly connected to the frame;

[0010] A connecting rod, one end of which is in linkage cooperation with the middle section of one of the closing crank arms, and the other end of which is in linkage connection with the operating main shaft;

[0011] An overtravel pull rod, the lower end of which is rotatably matched with the SMC crank arm of the solid-sealed pole column, and the upper end of which is in linkage cooperation with the lower end of the closing crank arm.

[0012] There are two connecting plates, which are arranged oppositely, and a space for fixing the closing crank arms is formed between the two.

[0013] One end of the connecting plate is provided with a buffer member, and a buffer pad is provided at the front end of the moving path of the connecting plate. The buffer pad is fixedly arranged on the frame.

[0014] The buffer member is a roller rotatably arranged between two connecting plates.

[0015] There is an installation space in the middle of the closing toggle arm, and the overtravel pull rod is rotatably arranged in the installation space of the closing toggle arm.

[0016] A rotatable first rotating shaft is arranged between the closing toggle arms. The upper end of the overtravel pull rod is provided with a bayonet adapted to the first rotating shaft. The first rotating shaft is placed in the bayonet and is rotatably connected thereto through a second rotating shaft.

[0017] The overtravel pull rod includes a first pull rod rotatably matched with the SMC toggle arm and a second pull rod rotatably matched with the closing toggle arm. A cavity is provided at the bottom of the second pull rod. The first pull rod is movably arranged in the cavity of the second pull rod, and an overtravel spring is arranged in the cavity.

[0018] The beneficial effects of the present utility model are as follows: By linking the closing toggle arms with a connecting plate, the relative swing of each closing toggle arm is realized, without directly connecting to the operating main shaft, thereby shortening the length of the entire operating main shaft. Moreover, the closing toggle arm can be directly driven by a connecting rod to act, with simple operation, saving a large amount of space, reducing the volume of the entire vacuum circuit breaker, enabling a more miniaturized design of the operating mechanism, and having lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the present utility model applied to a vacuum circuit breaker.

[0020] Figure 2 It is a schematic structural diagram of the present utility model.

[0021] Figure 3 It is a schematic structural diagram of the closing toggle arm of the present utility model.

[0022] Figure 4 It is a schematic cross-sectional view of the overtravel pull rod of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, the directional indications will change accordingly.

[0025] As Figure 1 shown, the present utility model discloses a closing and opening mechanism 10 for a vacuum circuit breaker. The closing and opening mechanism 10 is mainly used for a vacuum circuit breaker, enabling the operating mechanism to drive the solid-sealed pole column to perform closing or opening actions through this closing and opening mechanism. It is composed of a closing crank arm, a connecting plate, a tripping spring, a connecting rod, and an over-travel pull rod. Among them, the closing crank arm is arranged along the axis direction of the connecting plate, and its rotating shaft is rotatably arranged on the frame. Through the connecting plate, the synchronous actions of each closing crank arm are realized. At the same time, only one of the closing crank arms needs to be linked with the operating main shaft of the operating mechanism to achieve the control of closing and opening. At the same time, each closing crank arm is linked with the SMC crank arm of each solid-sealed pole column 20 through an over-travel pull rod.

[0026] A plurality of closing crank arms 120 rotatably arranged on the frame 30, and the center of the rotating shafts of each closing crank arm 120 is located on the same straight line. Among them, the closing crank arm is in a crescent shape or a "(" shape, and at least three hinge holes are provided on it. The hinge hole of the rotating shaft is located in the middle position, and the included angle between the connection line from the hinge hole at the upper end hinged with the connecting plate to the hinge hole of the rotating shaft and the connection line from the hinge hole of the lower over-travel pull rod to the connection hole of the rotating shaft is greater than 90 degrees. Thus, the movement of the SMC crank arm is driven by the swing of the closing crank arm.

[0027] The connecting plate 110, which is respectively connected to the upper ends 1210 of the closing crank arms 120. The connecting plate mainly plays a role in the synchronous actions between each closing crank arm. It is preferably two, arranged oppositely, and a space for fixing the closing crank arms 120 is formed between the two, that is, the closing crank arms 120 are clamped between the two connecting plates, making the connection reliability between each closing crank arm higher and the synchronism better.

[0028] Further, a buffer is arranged at one end in the moving direction of the connecting plate. The buffer is preferably a roller and can be made of a material with a certain elasticity, such as silica gel, rubber, etc. Thus, when tripping, when it impacts forward, it can cooperate with the buffer pad arranged on the frame to achieve buffering, eliminating the need for adding other buffers in the past. This method is simpler, has lower costs, and requires less space.

[0029] A number of opening springs 150, one end of which is fixedly connected to the connecting plate 110, and the other end of which is fixedly connected to the frame 30. One end of the opening spring is directly stuck between two connecting plates through a positioning pin, and the other end is fixed to the frame through another positioning pin, that is, the frame and the connecting plate are used to store energy for the opening spring. At the same time, there are two opening springs, which are respectively arranged between adjacent closing crank arms, making better use of space and ensuring uniform force on the connecting plate.

[0030] The connecting rod 130, one end of which is in linkage cooperation with the middle section 1220 of one of the closing crank arms 120, and the other end of which is in linkage connection with the operating main shaft 40. The rotation of the operating main shaft drives the swing of the closing crank arm connected thereto through the connecting rod. At the same time, the closing crank arm drives other closing crank arms to act synchronously through the connecting plate, thereby realizing the opening and closing operations.

[0031] The overtravel pull rod 160, the lower end of the overtravel pull rod 160 is rotatably matched with the SMC crank arm of the solid-sealed pole column 20, and the upper end of the overtravel pull rod 160 is in linkage cooperation with the lower end 1230 of the closing crank arm 120.

[0032] There are two connecting plates 110. One end of the two connecting plates 110 is provided with a buffer member 140, and a buffer pad is provided at the front end of the moving path of the connecting plate 110. The buffer pad is fixedly arranged on the frame 30.

[0033] The buffer member 140 is a roller rotatably arranged between the two connecting plates. The relatively rotatable design can also reduce a certain impact force.

[0034] The middle of the closing crank arm 120 has an installation space, and the overtravel pull rod 160 is rotatably arranged in the installation space of the closing crank arm 120.

[0035] A rotatable first rotating shaft 1240 is arranged between the closing crank arms 120. The upper end of the overtravel pull rod 160 is provided with a bayonet 1650 adapted to the first rotating shaft 1240, and the first rotating shaft 1240 is placed in the bayonet 1650 and is rotatably connected thereto through a second rotating shaft 1630. The cooperation of the first rotating shaft and the second rotating shaft enables the overtravel pull rod to have a certain universal rotation effect, so that more precise installation dimensions are not required during installation, and at the same time, its driving action on the SMC crank arm is smoother.

[0036] The overtravel pull rod 160 includes a first pull rod 1610 rotatably matched with the SMC crank arm and a second pull rod 1620 rotatably matched with the closing crank arm 120. A cavity 1640 is provided at the bottom of the second pull rod 1620. The first pull rod 1610 is movably arranged in the cavity 1640 of the second pull rod 1620, and an overtravel spring is arranged in the cavity 1640. The first pull rod can move relative to the cavity of the second pull rod, thereby compressing the overtravel compression spring.

[0037] The embodiments should not be regarded as limitations to the present utility model, but any improvements made based on the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A switching mechanism for a vacuum circuit breaker, characterized in that: It includes: A plurality of closing crank arms (120) rotatably arranged on the frame (30), wherein the rotation axis centers of the closing crank arms (120) are located on the same straight line; Connecting plates (110) respectively connected to the upper ends of the closing lever arms (120); A plurality of opening springs (150), one end of which is fixedly connected to the connecting plate (110), and the other end of which is fixedly connected to the frame (30); A connecting rod (130), one end of which is linked to a middle section of one of the closing lever arms (120), and the other end of which is linked to an operating spindle (40); An over-travel pull rod (160), wherein the lower end of the over-travel pull rod (160) is rotatably matched with the SMC crank arm of the sealed pole (20), and the upper end of the over-travel pull rod (160) is linked with the lower end of the closing crank arm (120).

2. The opening and closing mechanism for a vacuum circuit breaker according to claim 1, characterized in that: There are two connecting plates (110), which are arranged opposite to each other, and a space for fixing the closing crank arm (120) is formed between the two.

3. The opening and closing mechanism for a vacuum circuit breaker according to claim 2, characterized in that: A buffer member (140) is provided at one end of the connecting plate (110), and a buffer pad is provided at the front end of the moving path of the connecting plate (110), and the buffer pad is fixedly arranged on the frame (30).

4. The opening and closing mechanism for a vacuum circuit breaker according to claim 3, characterized in that: The buffer member (140) is a roller rotatably arranged between two connecting plates.

5. The opening and closing mechanism for a vacuum circuit breaker according to claim 1, characterized in that: The middle of the closing crank arm (120) is provided with an installation space, and the overtravel pull rod (160) is rotatably arranged in the installation space of the closing crank arm (120).

6. The opening and closing mechanism for a vacuum circuit breaker according to claim 5, characterized in that: A rotatable first rotating shaft (1240) is provided between the closing crank arms (120), a bayonet (1650) adapted to the first rotating shaft (1240) is provided at the upper end of the overtravel pull rod (160), and the first rotating shaft (1240) is placed in the bayonet (1650) and is rotatably connected to the second rotating shaft (1630) via the second rotating shaft (1630).

7. The opening and closing mechanism for a vacuum circuit breaker according to claim 1, characterized in that: The over-travel pull rod (160) comprises a first pull rod (1610) rotatably matched with the SMC crank arm and a second pull rod (1620) rotatably matched with the closing crank arm (120), and a cavity (1640) is provided at the bottom of the second pull rod (1620), the first pull rod (1610) is movably arranged in the cavity (1640) of the second pull rod (1620), and an over-travel spring is provided in the cavity (1640).

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