Closing buffer device, spring operating mechanism, circuit breaker and high-voltage electrical equipment

Abstract

The utility model discloses a closing buffer device, a spring operating mechanism, a circuit breaker and high-voltage electrical equipment, which belong to the technical field of high-voltage electrical equipment and comprise a dowel bar, a buffer device and a guide device. The guide device is fixedly connected with a transmission shaft of the permanent magnet circuit breaker; one end of the dowel bar is connected with the spring operating mechanism, and the other end of the dowel bar is slidably connected with the guide device; the buffer device is connected with the dowel bar, and when the permanent magnet operating mechanism is switched on, the buffer device deforms and is used for absorbing the overshoot acting force of the spring operating mechanism; according to the closing buffer device, the original hard connection between the spring operating mechanism and the transmission shaft is changed, and the buffer device is arranged between the spring operating mechanism and the transmission shaft, so that the permanent magnet operating mechanism is kept at the closing position after closing, and the buffer device absorbs the overshoot acting force brought by the spring operating mechanism; the problem of switching-on failure of the permanent magnet operating mechanism caused by overshoot acting force generated by the spring operating mechanism is avoided, and the switching-on effectiveness of the permanent magnet circuit breaker is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage electrical equipment, in particular to a closing buffer device, a spring operating mechanism, a circuit breaker and high-voltage electrical equipment. Background Art

[0002] Permanent magnet circuit breakers are widely used due to their excellent characteristics such as small number of mechanical parts, long mechanical life, and frequent operation. However, when the permanent magnet operating mechanism of the permanent magnet circuit breaker is powered off, the permanent magnet circuit breaker needs to be quickly closed, and a manual closing mechanism is required to close the circuit. Therefore, a spring operating mechanism is designed in the permanent magnet circuit breaker. The spring operating mechanism drives the transmission shaft through the crank arm to close the permanent magnet circuit breaker.

[0003] During the manual closing process, the spring operating mechanism uses the elastic force of the spring to drive the movement of the crank arm. Since the output characteristics of the spring and the load demand characteristics are just opposite, the closing overshoot phenomenon of the spring operating mechanism during the closing process is difficult to avoid. The closing overshoot phenomenon can be understood as the permanent magnetic operating mechanism is closed during the action of the spring operating mechanism. However, after closing, the overshoot force of the spring operating mechanism at this time has not completely disappeared, and continues to apply force to the transmission shaft, making it impossible for the permanent magnetic operating mechanism to remain in the closed position, thereby causing the manual closing to fail. Summary of the invention

[0004] In view of the problems existing in the prior art, the utility model provides a closing buffer device, a spring operating mechanism, a circuit breaker and high-voltage electrical equipment. The closing overshoot force of the spring operating mechanism is offset by the buffer device, so that the permanent magnet operating mechanism is stably maintained in the closing position.

[0005] The utility model is realized by the following technical solutions:

[0006] In a first aspect, the present application proposes a closing buffer device, including a force transmission rod, a buffer device and a guide device;

[0007] The guide device is fixedly connected to the transmission shaft of the permanent magnetic circuit breaker;

[0008] One end of the force transmission rod is connected to the spring operating mechanism of the permanent magnetic circuit breaker, and the other end is slidably connected to the guide device;

[0009] The buffer device is connected to the force transmission rod. When the permanent magnetic operating mechanism of the permanent magnetic circuit breaker is closed, the buffer device is deformed to absorb the overshoot force of the spring operating mechanism.

[0010] Furthermore, a guide hole is provided inside the guide device, the axial direction of the guide hole is arranged parallel to the transmission shaft, and the force transmission rod is installed in the guide hole.

[0011] Furthermore, the force transmission rod is a transition shaft pin, one end of the transition shaft pin is rotatably connected to the crank arm of the spring operating mechanism, and the buffer device is sleeved on the other end of the transition shaft pin.

[0012] Furthermore, the buffer device is an elastic element, which is sleeved on the transition shaft pin, one end of which abuts against the guide device, and the other end is connected to the end of the force transmission rod.

[0013] Furthermore, the elastic element is a spring, a disc spring and an elastic rubber.

[0014] Furthermore, the force causing the elastic element to deform is smaller than the holding force of the permanent magnetic operating mechanism at the closing position.

[0015] Furthermore, the guide device is fixedly connected to the transmission shaft of the permanent magnetic circuit breaker and is located on a side close to the spring operating mechanism.

[0016] In a second aspect, the present application proposes a spring operating mechanism, including the closing buffer device.

[0017] In a third aspect, the present application proposes a circuit breaker, comprising the closing buffer device.

[0018] In a fourth aspect, the present application proposes a high-voltage electrical equipment, including the circuit breaker.

[0019] Compared with the prior art, the utility model has the following beneficial technical effects:

[0020] The present application provides a closing buffer device for a permanent magnetic circuit breaker, which adopts a closing buffer device to connect a crank arm and a transmission shaft of a spring operating mechanism, and the closing buffer device absorbs the overshoot force of the spring operating mechanism to keep the transmission shaft stationary, thereby keeping the permanent magnetic operating mechanism in a closed position, ensuring the closing effectiveness of the permanent magnetic circuit breaker, and solving the problem that the overshoot force of the spring operating mechanism causes the closing failure of the permanent magnetic operating mechanism; the closing buffer device changes the original hard connection between the spring operating mechanism and the transmission shaft, and arranges a group of buffer devices between the spring operating mechanism and the transmission shaft, so that after the permanent magnetic operating mechanism is closed and kept in the closed position, the overshoot force brought by the spring operating mechanism can be absorbed by the buffer device, avoiding the problem that the overshoot force generated by the spring operating mechanism causes the closing failure of the permanent magnetic operating mechanism, and improving the closing effectiveness of the permanent magnetic circuit breaker.

[0021] The present application also proposes a spring operating mechanism, a circuit breaker and a high-voltage electrical equipment, all of which have all the advantages of the above-mentioned closing buffer device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the structure of the permanent magnetic circuit breaker of the utility model;

[0024] Figure 2 It is a structural schematic diagram of the closing buffer device of the utility model.

[0025] In the figure: 1. housing; 2. spring operating mechanism; 3. transmission shaft; 4. elastic element; 5. fixing pin; 6. permanent magnetic operating mechanism; 7. crank arm; 8. transition shaft pin; 9. guide sleeve. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The utility model provides a closing buffer device for a permanent magnetic circuit breaker, comprising a force transmission rod, a buffer device and a guide device;

[0034] The guide device is fixedly connected to the transmission shaft 3 of the permanent magnetic circuit breaker, and the guide device is used to keep the movement direction of the force transmission rod consistent with that of the transmission shaft 3;

[0035] The force transmission rod has one end connected to the crank arm 7 of the spring operating mechanism 2 of the permanent magnetic circuit breaker, and the other end slidably connected to the guide device;

[0036] The buffer device is connected to the force transmission rod. When the permanent magnetic operating mechanism 6 of the permanent magnetic circuit breaker is closed, the buffer device is deformed to absorb the overshoot force of the spring operating mechanism 2.

[0037] The closing buffer device, the force transmission rod is connected to the crank arm 7 through the buffer device. During the manual rapid closing process, the spring operating mechanism 2 puts the permanent magnetic operating mechanism 6 in the closing position through the transmission shaft 3. At this time, the overshoot force of the spring operating mechanism 2 is absorbed by the buffer device, which solves the problem that the permanent magnetic operating mechanism 6 cannot be kept in the closing position due to the overshoot force of the spring operating mechanism 2.

[0038] It should be noted that the closing buffer device does not deform during the closing process. When the permanent magnetic operating mechanism 6 is closed and maintained in the closed position under the action of magnetic force, the closing buffer device deforms to absorb energy. Therefore, the force required for the closing buffer device to deform is greater than the friction force between the spring operating mechanism 2 and the permanent magnetic operating mechanism 6 during the closing process, and is less than the holding force of the permanent magnetic operating mechanism 6 in the closed position. In this case, the closing buffer device absorbs the overshoot force of the spring operating mechanism 2.

[0039] Example 1

[0040] See also Figure 2 , is a structural diagram of a closing buffer device for a permanent magnetic circuit breaker of the present application, including a force transmission rod, a buffer device and a guide device;

[0041] The guide device is a guide sleeve 9, which is a hollow tube structure with a guide hole formed inside. The axial direction of the guide hole is arranged parallel to the transmission shaft 3 of the permanent magnetic circuit breaker. The guide sleeve 9 is fixed to the side wall of the transmission shaft 3 and is located on the side close to the spring operating mechanism 2. Since the axial direction of the guide hole is parallel to the transmission shaft 3, the running direction of the force transmission rod can be kept consistent with the transmission shaft 3.

[0042] The force transmission rod is a transition shaft pin 8, which is inserted into the guide hole, with both ends extending out of the guide hole, one end being rotatably connected to the crank arm 7 of the spring operating mechanism 2, and the other end of the transition shaft pin 8 is provided with a fixed pin 5, and the buffer device is sleeved on the transition shaft pin 8 and is located between the fixed pin 5 and the guide sleeve 9. When the permanent magnetic operating mechanism 6 is closed, the transition shaft pin 8 compresses the buffer device through the fixed pin 5 to offset the overshoot force, thereby avoiding the overshoot force from being applied to the transmission shaft 3, causing the permanent magnetic operating mechanism 6 to be unable to maintain the closed position, thereby ensuring the effectiveness of the closing of the permanent magnetic circuit breaker.

[0043] The buffer device is an elastic element 4, which is sleeved on the transition shaft pin 8, one end of which abuts against the guide sleeve 9, and the other end abuts against the fixed pin 5. After the permanent magnetic operating mechanism 6 completes the closing, the transition shaft pin 8 continues to move under the overshoot force. At this time, the elastic element deforms to absorb the overshoot force, so that the transmission shaft 3 remains stationary.

[0044] The elastic element 4 is a component that can be deformed and self-recovering, such as a spring, a high-elastic rubber, a disc spring, etc.

[0045] The closing buffer device changes the original hard connection between the spring operating mechanism 2 and the transmission shaft 3, and sets a group of elastic elements 4 between the spring operating mechanism 2 and the transmission shaft 3, so that the permanent magnetic operating mechanism 6 can be kept in the closed position after closing, and the overshoot force brought by the spring operating mechanism 2 is absorbed by the elastic element 4, avoiding the problem that the permanent magnetic operating mechanism 6 cannot be kept in the closed position due to the overshoot force.

[0046] Example 2

[0047] Based on the above-mentioned closing buffer device, the present application also proposes a buffer-type spring operating mechanism, which may include a spring driving mechanism and the above-mentioned closing buffer device.

[0048] The swing end of the crank arm 7 of the spring operating mechanism 2 is connected to the transmission shaft 3 of the permanent magnetic circuit breaker through a closing buffer device, and the transmission shaft 3 is used to connect the permanent magnetic operating mechanism 6.

[0049] The connection method of the closing buffer device, the crank arm 7 and the transmission shaft 3 is referred to in Example 1 and will not be repeated here.

[0050] The buffered spring operating mechanism is installed in the permanent magnetic circuit breaker and replaces the spring operating mechanism 2 in the existing permanent magnetic circuit breaker. When the permanent magnetic circuit breaker needs to be closed in the power-off state, the buffered spring operating mechanism keeps the permanent magnetic operating mechanism 6 stably in the closed position through the transmission rod, thereby improving the closing effectiveness of the permanent magnetic circuit breaker.

[0051] Example 3

[0052] Based on the above-mentioned closing buffer device, the present application also proposes a permanent magnetic circuit breaker, see Figure 1 , may include a housing 1, and a spring operating mechanism 2, a permanent magnetic operating mechanism 6 and the closing buffer device arranged inside the housing.

[0053] The spring operating mechanism 2 and the permanent magnet operating mechanism 6 are arranged on both sides of the housing 1 and connected through the transmission shaft 3. The crank arm 7 of the spring operating mechanism 2 is connected to the transmission shaft 3 through a closing buffer device.

[0054] Example 4

[0055] A high-voltage electrical equipment, comprising the permanent magnet circuit breaker described in Example 3.

[0056] The high-voltage electrical equipment includes transformers, high-voltage switchgear, ring network cabinets, motors, generators, etc. The permanent magnet circuit breakers in the high-voltage electrical equipment have high reliability and fast breaking capacity. When a system fault occurs, the permanent magnet circuit breaker can quickly cut off the fault current to prevent the fault from expanding and ensure the normal operation of other equipment. At the same time, it can quickly close the circuit breaker under the power-off device and ensure the effectiveness of the closing.

[0057] Example 5

[0058] An electric power system comprises the high-voltage electrical equipment described in Example 4.

[0059] The power system includes substations, industrial power grids, distribution systems, high-voltage transmission grids, new energy power generation systems, etc.

[0060] High-voltage electrical equipment with permanent magnetic circuit breakers is installed in the above-mentioned power system. When a line in the power system fails, the permanent magnetic circuit breaker of the high-voltage electrical equipment can quickly cut off the fault current to prevent the fault from expanding, thereby protecting the normal operation of other equipment and the power system; in addition, when the equipment or line is overloaded, the permanent magnetic circuit breaker can sense and cut off the current to prevent the equipment from being damaged due to long-term overload; secondly, when a short-circuit fault occurs in the power system, the permanent magnetic circuit breaker can quickly cut off the huge short-circuit current to protect the system from the impact and damage of the short-circuit current; in new energy power generation systems, such as wind farms and photovoltaic power stations, permanent magnetic circuit breakers can be used to protect new energy power generation equipment and ensure the safe and reliable access of new energy to the power grid; installing high-voltage electrical equipment with permanent magnetic circuit breakers is helpful to enhance the protection capability, reliability and performance of the power system and improve the stability and safety of power supply.

[0061] The principle and working process of the above closing buffer device are as follows:

[0062] Under normal working conditions, the permanent magnetic operating mechanism 6 directly realizes the opening and closing operation of the permanent magnetic circuit breaker through the transmission shaft 3; under special working conditions (power failure), the spring operating mechanism 2 is required to perform manual fast closing. The spring operating mechanism 2 drives the transmission shaft 3 through the transition shaft pin 8, so that the permanent magnetic operating mechanism 6 is closed and maintained in the closed position, thereby realizing manual fast closing. During the manual fast closing action, the elastic element 4 can eliminate the problem of inconsistent strokes between the spring operating mechanism 2 and the permanent magnetic operating mechanism 6, and absorb the influence of the overshoot force of the spring operating mechanism 2 on the permanent magnetic operating mechanism 6. The closing buffer device changes the spring operating mechanism 2 and the transmission shaft 3 into a soft connection without changing the internal transmission principle and structure of the permanent magnetic circuit breaker, thereby solving the problem that the overshoot force of the spring operating mechanism 2 makes the permanent magnetic operating mechanism 6 unable to remain in the closed position.

[0063] The above content is only for explaining the technical idea of ​​the utility model, and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the utility model.

Claims

1. A closing buffer device, characterized in that: It includes a force transmission rod, a buffer device and a guide device; The guide device is fixedly connected to the transmission shaft (3) of the permanent magnetic circuit breaker; One end of the force transmission rod is connected to the spring operating mechanism (2) of the permanent magnetic circuit breaker, and the other end is slidably connected to the guide device; The buffer device is connected to the force transmission rod, and when the permanent magnetic operating mechanism (6) of the permanent magnetic circuit breaker is closed, the buffer device is deformed to absorb the overshoot force of the spring operating mechanism (2).

2. A closing buffer device according to claim 1, characterized in that: A guide hole is provided inside the guide device, the axial direction of the guide hole is arranged parallel to the transmission shaft (3), and the force transmission rod is installed in the guide hole.

3. A closing buffer device according to claim 1, characterized in that: The force transmission rod is a transition shaft pin (8), one end of which is rotatably connected to a crank arm (7) of a spring operating mechanism (2), and a buffer device is sleeved on the other end of the transition shaft pin (8).

4. A closing buffer device according to claim 1, characterized in that: The buffer device is an elastic element (4), which is sleeved on the transition shaft pin (8), one end of which abuts against the guide device and the other end of which is connected to the end of the force transmission rod.

5. A closing buffer device according to claim 4, characterized in that: The elastic element (4) is a spring, a disc spring and elastic rubber.

6. A closing buffer device according to claim 4, characterized in that: The force causing the elastic element (4) to deform is smaller than the holding force of the permanent magnetic operating mechanism (6) at the closing position.

7. A closing buffer device according to claim 1, characterized in that: The guide device is fixedly connected to the transmission shaft (3) of the permanent magnetic circuit breaker and is located on a side close to the spring operating mechanism (2).

8. A spring operating mechanism, characterized in that: It comprises the closing buffer device as described in any one of claims 1 to 7.

9. A circuit breaker, characterized in that: It comprises the closing buffer device as described in any one of claims 1 to 7.

10. A high voltage electrical equipment, characterized in that: A circuit breaker comprising the circuit breaker as claimed in claim 9.

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