Damping device for circuit breaker and circuit breaker comprising damping device

Abstract

A damping device for a circuit breaker includes a main body member including a bottom wall and an inner peripheral wall and an outer peripheral wall extending from the bottom wall in a longitudinal direction, the inner peripheral wall defining a first through hole penetrating the main body member in the longitudinal direction; the cover is hermetically connected to the top ends of the inner peripheral wall and the outer peripheral wall, and the bottom wall, the inner peripheral wall, the outer peripheral wall and the cover define an accommodating space; the moving part is contained in the containing space, and the containing space is filled with fluid; the size of the moving part in the longitudinal direction is smaller than that of the containing space in the longitudinal direction, so that when the damping device moves in the longitudinal direction and is blocked, the moving part can move relative to the main body part in the containing space.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of damping device for circuit breaker and the circuit breaker comprising the damping device. BACKGROUND

[0002] Circuit breaker is the key equipment for controlling and protecting circuit in power system, it can automatically disconnect or close circuit when circuit fault occurs. In the closing operation of circuit breaker, moving contact is pushed away by reaction force after contacting with static contact, then contact again and be pushed away, that is, closing bounce phenomenon occurs. When in the bounce process, arc does not disappear, contact ablation intensifies, and then influence the performance and service life of circuit breaker. Serious bounce can even damage other components in system, such as insulation and transmission mechanism.

[0003] In order to solve closing bounce problem, various means have been taken, including reducing structural stiffness (such as adding hole in pole mounting plate), using copper covering in vacuum arc extinguishing interior, using oil damping to reduce closing movement, using elastic element on fixed side, using additional mechanism (such as repulsion coil) to reduce speed before contact of contact, using damper in contact spring interior and using elastic element on heat sink of high rated value, etc. These methods can reduce bounce time to some extent, but the effect is not ideal, often cannot completely solve the problem, and even there are various shortcomings, such as increasing product cost, affecting dynamic behavior of movement system, reducing operation reliability and increasing complexity of maintenance and adjustment, etc. And these solutions often need to make complex modification to circuit breaker, which can affect its original design and performance, and the effect is limited in actual operation, and cannot fundamentally solve closing bounce problem. SUMMARY

[0004] In view of the above problems, according to the first aspect of the utility model, a kind of damping device for circuit breaker is provided, characterized by comprising: main part, including bottom wall and inner circumferential wall and outer circumferential wall extending from bottom wall in longitudinal direction, the first through hole that the inner circumferential wall is defined in longitudinal direction and passes through the main part;Cover, sealingly connected to the top end of the inner circumferential wall and outer circumferential wall, the bottom wall, inner circumferential wall, outer circumferential wall and the cover define containing space;Movement component, contained in the containing space, and the containing space is filled with fluid;Wherein, the size of the movement component in longitudinal direction is less than the size of the containing space in longitudinal direction, so that when the damping device moves in longitudinal direction and is blocked, the movement component can move in the containing space relative to the main part.

[0005] The damping device can be installed on an insulating pull rod of a circuit breaker, can reduce or inhibit vibration between contacts when the circuit breaker is closed, in particular vibration of a moving contact, thereby reducing or eliminating closing bounce time.

[0006] The damping device according to the utility model can have one or more of the following features.

[0007] According to one embodiment, the accommodation space and the moving component are both circular ring shapes in a cross section perpendicular to the longitudinal direction.

[0008] According to one embodiment, the moving component includes a second through hole extending in the longitudinal direction, the second through hole has a diameter greater than an outer diameter of the inner peripheral wall, and the moving component is sleeved in the main body component via the second through hole.

[0009] According to one embodiment, an inner diameter of the outer peripheral wall is greater than an outer diameter of the moving component.

[0010] According to one embodiment, top ends of the inner peripheral wall and the outer peripheral wall of the main body component are sealingly connected to the cover via a necking.

[0011] According to one embodiment, top ends of the inner peripheral wall and the outer peripheral wall of the main body component are sealingly connected to the cover via welding.

[0012] According to one embodiment, the top ends of the inner peripheral wall and the outer peripheral wall have sealing portions, and a sealing ring is arranged between the sealing portions and the cover.

[0013] According to one embodiment, the sealing portion of the inner peripheral wall is a stepped portion, and the sealing portion of the outer peripheral wall is a groove.

[0014] According to one embodiment, the fluid is aviation hydraulic oil.

[0015] According to the second aspect of the utility model, a circuit breaker is provided, characterized in that it comprises a static contact, a moving contact configured to contact or separate from the static contact, an insulating pull rod fixed to the moving contact, and a damping device according to any one of the preceding claims, the damping device being fixedly connected to the insulating pull rod of the circuit breaker via the first through hole.

[0016] According to one embodiment, the insulating pull rod further comprises an insulating pull rod cover and a mounting section extending inside the insulating pull rod cover, and the damping device is fixedly mounted on the mounting section of the insulating pull rod. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments of the present application will be briefly introduced below. Among them, the drawings are only used to show some embodiments of the present application, and not to limit all embodiments of the present application to this.

[0018] Figure 1 is a sectional side view of a circuit breaker according to an embodiment of the present application;

[0019] Figure 2 is a side view of a damping device according to an embodiment of the present application;

[0020] Figure 3 is a sectional view of a damping device according to an embodiment of the present application;

[0021] Figure 4 is a sectional view of a main body component according to an embodiment of the present application;

[0022] Figure 5 is a schematic view of a welding position of a damping device according to an embodiment of the present application.

[0023] List of reference signs

[0024] 1 circuit breaker;

[0025] 11 damping device, 111 main body component, 111a inner peripheral wall, 111b outer peripheral wall, 111c bottom wall, 112 first through hole, 113 cover, 114 moving component, 115 second through hole, 116 fluid, 117 sealing part, 117a step part, 117b groove, 118a small sealing ring, 118b large sealing ring;

[0026] 12 insulation pull rod, 121 insulation pull rod cover, 122 mounting section;

[0027] 13 overtravel spring assembly;

[0028] 14 moving contact;

[0029] 15 stationary contact;

[0030] Y longitudinal direction;

[0031] W welding position. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme of the utility model embodiments will be described clearly and completely in the following with reference to the drawings of the utility model specific embodiments. The same reference signs in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0033] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the common meaning in the field of the utility model to which the utility model belongs. The "first", "second" and similar words used in the utility model patent application description and claims do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, which may change accordingly when the absolute position of the described object changes.

[0034] The utility model will be described in detail below by describing example embodiments.

[0035] Figure 1 is the sectional view of the circuit breaker according to an embodiment of the utility model, wherein only the components of the circuit breaker related to the invention content are shown.

[0036] As Figure 1 shown, the circuit breaker 1 includes a static contact 15, a dynamic contact 14, an insulating pull rod 12 fixed to the dynamic contact 14, an overtravel spring assembly 13 and a damping device 11. The insulating pull rod 12 includes an insulating pull rod cover 121 and a mounting section 122 extending inside the insulating pull rod cover 121, in Figure 1 In the embodiment shown, the insulating pull rod 12 is threadedly connected to the dynamic contact 14. When the circuit is working normally, the connection of the circuit is realized by keeping the dynamic contact 14 in contact with the static contact 15, which is also the closed state (as shown in Figure 1 When the circuit fails, for example, overload, overcurrent and the like, the dynamic contact 14 is separated from the static contact 15, thereby disconnecting the circuit, which is also called the open state (not shown in the figure). When the circuit breaker 1 switches from the open state to the closed state, the collision between the contacts will bounce. InFigure 1 In the shown embodiment, the damping device 11 is fixedly assembled to the insulating pull rod 12 to overcome or absorb the vibration of the movable contact 14 so as to reduce or eliminate the bounce, the principle and the mounting manner of which will be described in detail below.

[0037] In Figure 1 In the shown embodiment, the damping device 11 is mounted at the mounting section 122 of the insulating pull rod 12. Alternatively, the damping device 11 can be located at the position of the mounting section 122 above the over-travel spring assembly 13. This mounting position can ensure that the damping device 11 does not directly contact the conductive components of the circuit breaker 1, and such physical isolation can maintain the insulation performance of the insulating pull rod 12 and does not affect the overall size of the circuit breaker 1, in addition, such non-invasive design has little effect on the motion characteristics of the original dynamic system of the circuit breaker 1. Alternatively, the damping device 11 can also be mounted at other positions inside the insulating pull rod cover 121 of the insulating pull rod 12, for example, the lowermost end of the mounting section 122 (not shown in the figure), which can also ensure the insulation performance of the insulating pull rod 12 and the motion characteristics of the original dynamic system.

[0038] Figure 2 And Figure 3 respectively show the axial view and the cross-sectional view along the A-A plane of the damping device 11 according to an embodiment of the present application, Figure 4 show the cross-sectional view along the A-A plane of the main body component 111 according to an embodiment of the present application.

[0039] The specific structure of the damping device 11 according to the present application will be described below with reference to Figures 2 to 4 As shown in Figure 2 and Figure 3 , the damping device 11 comprises a main body component 111, a cover 113 and a moving component 114. The main body component 111 comprises a bottom wall 111c and an inner peripheral wall 111a and an outer peripheral wall 111b extending from the bottom wall 111c in the longitudinal direction Y, the cover 113 is sealingly connected to the top end of the inner peripheral wall 111a and the outer peripheral wall 111b, and the bottom wall 111c, the inner peripheral wall 111a, the outer peripheral wall 111b and the cover 113 together define a containing space inside the main body component 111.

[0040] According to the embodiment of the present application, as shown in Figure 3 and Figure 4As shown, the inner circumferential wall 111a defines a first through hole 112 through the main body component 111 in the longitudinal direction Y, the moving component 114 comprises a second through hole 115 extending in the longitudinal direction Y, the diameter of the second through hole 115 is greater than the outer diameter of the inner circumferential wall 111a, and the inner diameter of the outer circumferential wall 111b is greater than the outer diameter of the moving component 114. The moving component 114 is sleeved in the main body component 111 via the second through hole 115, so as to be accommodated in the accommodation space, and the accommodation space is filled with a fluid 116. The fluid 116 has a certain viscosity, and is optionally aviation hydraulic oil.

[0041] As shown in the embodiment shown in Figure 3 The size of the moving component 114 in the longitudinal direction Y is smaller than the size of the accommodation space in the longitudinal direction Y, so that when the damping device 11 follows the insulating pull rod 12 to move in the longitudinal direction Y and is blocked, the moving component 114 can move in the accommodation space relative to the main body component 111. Since the diameter of the second through hole of the moving component 114 is greater than the outer diameter of the inner circumferential wall 111a and the outer diameter of the moving component 114 is smaller than the inner diameter of the outer circumferential wall 111b, the moving direction of the moving component 114 in the accommodation space relative to the main body component 111 is not limited to the vertical direction, but can also be any other possible direction, and the relative motion trajectory can be a straight line or any possible curved shape.

[0042] According to the embodiment of the utility model, as shown in Figure 1 The damping device 11 is fixedly connected to the insulating pull rod 12 of the circuit breaker 1 via the first through hole 112, so that the damping device 11 can follow the insulating pull rod 12 to move at a faster speed, for example, in the embodiment shown in Figure 1 The damping device 11 can follow the insulating pull rod 12 to move up and down in the longitudinal direction Y.

[0043] For example, during the upward movement of the insulating pull rod 12, the moving component 114 is located at the bottom position of the accommodation space, when the movable contact 14 is closed, due to the impact force, the movable contact 14 is repelled from the static contact 15 and moves downward, while the moving component 114 in the damping device 11 continues to move upward for a distance under the action of inertia, at the same time, due to the presence of aviation hydraulic oil in the accommodation space, the speed of upward movement of the moving component 114 is slowed down, a damping effect is generated, and then transmitted to the insulating pull rod 12 and the movable contact 14, thereby hindering the repelling effect of the movable contact 14 due to the impact force, so as to achieve the effect of reducing or eliminating the contact bounce.

[0044] According to the embodiment of the utility model, the damping device 11 is in a cylindrical shape as a whole, and the accommodating space, the cover 113 and the moving part 114 are all in a circular ring shape along the cross section perpendicular to the longitudinal direction Y. Correspondingly, the inner circumferential wall 111a and the outer circumferential wall 111b of the main part 111 are both in a cylindrical shape, which extends in the longitudinal direction Y along the circumferential direction.

[0045] It should be noted that, Figure 2 and Figure 3 The shape of the damping device 11 and the moving part 114 shown in the drawings is only exemplary, and the damping device 11 and the moving part 114 can all be formed in other possible shapes, for example, can be formed in a cube, a cuboid or any other possible shape, at this time, the inner circumferential wall 111a and the outer circumferential wall 111b can extend in the longitudinal direction Y along the circumferential direction.

[0046] Optionally, the moving part 114 can be formed integrally, or can also be composed of multiple parts. Optionally, the moving part 114 can also be composed of multiple small mass blocks, such as fine iron sand, quartz stone particles, etc.

[0047] Optionally, the first through hole 112 can be a threaded hole, which can be threadedly connected with the screw rod of the insulating pull rod 12. The damping device 11 can also be fixed to the insulating pull rod 12 in other possible ways.

[0048] According to the embodiment of the utility model, the top end of the inner circumferential wall 111a and the outer circumferential wall 111b of the main part 111 can be sealingly connected with the cover 113 through a necking (not shown in the drawings). In this sealing mode, the top end of the inner circumferential wall 111a and the outer circumferential wall 111b has a chamfered portion, so the thickness is thinned, so as to facilitate the downward pressing of the edge portion of a certain width of the chamfered top towards the top end of the cover 113, to form a riveting seal.

[0049] As Figure 4 shown, the top end of the inner circumferential wall 111a and the outer circumferential wall 111b can have a sealing portion 117, and a sealing ring is arranged between the sealing portion 117 and the cover 113. The sealing ring includes a large sealing ring 118b and a small sealing ring 118a. In Figure 4 the embodiment shown in the drawings, the sealing portion 117 of the inner circumferential wall 111a is a stepped portion 117a, and the sealing portion 117 of the outer circumferential wall 111b is a groove 117b. The stepped portion 117a can reduce the installation space of the sealing ring, thereby facilitating the thickness of the inner circumferential wall 111a, and the groove 117b can prevent the sealing ring from moving inward, thereby ensuring the sealing effect.

[0050] In other embodiments of the present application, the sealing part 117 of the inner peripheral wall 111a can be a groove 117b, the sealing part 117 of the outer peripheral wall 111b can be a step part, or the sealing parts 117 of the inner and outer peripheral walls 111a, 111b can both be grooves, or the sealing parts 117 of the inner and outer peripheral walls 111a, 111b can both be step parts. It should be noted that when the sealing part 117 of the outer peripheral wall 111b is provided as a step part 117a, the cover 113 needs to be provided with a corresponding part to prevent the large sealing ring 118b from moving inward.

[0051] According to the embodiments of the present application, the top ends of the inner and outer peripheral walls 111a, 111b of the main body part 111 can be respectively sealed and connected with the cover 113 through necking. In this sealing mode, the top ends of the inner and outer peripheral walls 111a, 111b have chamfered parts and thus the thickness is thinned, so as to facilitate the downward pressing of the edge part of a certain width of the chamfered top towards the top end of the cover 113, to form a riveting seal. This process operation is simple, and can achieve good sealing effect at a lower cost.

[0052] According to the embodiments of the present application, as shown in Figure 5 the top ends of the inner and outer peripheral walls 111a, 111b of the main body part 111 are respectively sealed and connected with the cover 113 through welding along the welding position W. The welding process can also reduce the cost of sealing while ensuring good sealing effect.

[0053] The exemplary embodiments of the damping device and the circuit breaker proposed by the present application are described in detail above with reference to the preferred embodiments, however, it can be understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments without departing from the concept of the present application, and various technical features and structures proposed by the present application can be combined in various ways without exceeding the protection scope of the present application.

Claims

1. A damping device (11) for a circuit breaker (1), characterized in that, include: The main body component (111) includes a bottom wall (111c) and an inner peripheral wall (111a) and an outer peripheral wall (111b) extending from the bottom wall (111c) in the longitudinal direction (Y), wherein the inner peripheral wall (111a) defines a first through hole (112) penetrating the main body component (111) in the longitudinal direction (Y). A cover (113) is sealed to the top of the inner peripheral wall (111a) and the outer peripheral wall (111b), and the bottom wall (111c), the inner peripheral wall (111a), the outer peripheral wall (111b) and the cover (113) define an accommodating space; A moving part (114) is housed within the receiving space, and the receiving space is filled with fluid (116). The moving part (114) is smaller in the longitudinal direction (Y) than the accommodating space in the longitudinal direction (Y), such that when the damping device (11) moves in the longitudinal direction (Y) and is blocked, the moving part (114) can move relative to the main body part (111) within the accommodating space.

2. The damping device (11) according to claim 1, characterized in that, Both the accommodating space and the moving part (114) have annular cross-sections perpendicular to the longitudinal direction (Y).

3. The damping device (11) according to claim 2, characterized in that, The moving component (114) includes a second through hole (115) extending in the longitudinal direction (Y), the diameter of the second through hole (115) being larger than the outer diameter of the inner peripheral wall (111a), and the moving component (114) being sleeved in the main body component (111) via the second through hole (115).

4. The damping device (11) according to claim 2, characterized in that, The inner diameter of the outer peripheral wall (111b) is larger than the outer diameter of the moving part (114).

5. The damping device (11) according to any one of claims 1 to 4, characterized in that, The top ends of the inner peripheral wall (111a) and outer peripheral wall (111b) of the main body component (111) are sealed to the cover (113) through a constriction.

6. The damping device (11) according to any one of claims 1 to 4, characterized in that, The top ends of the inner peripheral wall (111a) and outer peripheral wall (111b) of the main component (111) are sealed to the cover (113) by welding.

7. The damping device (11) according to any one of claims 1 to 4, characterized in that, The top ends of the inner peripheral wall (111a) and the outer peripheral wall (111b) have sealing portions (117), and a sealing ring is provided between the sealing portions (117) and the cover (113).

8. The damping device (11) according to claim 7, characterized in that, The sealing part (117) of the inner peripheral wall (111a) is a stepped part (117a), and the sealing part (117) of the outer peripheral wall (111b) is a groove (117b).

9. The damping device (11) according to any one of claims 1 to 4, characterized in that, The fluid (116) is aviation hydraulic oil.

10. A circuit breaker (1), characterized in that, The circuit breaker includes a stationary contact (15), a moving contact (14) configured to contact or separate from the stationary contact (15), an insulating pull rod (12) fixed to the moving contact (14), and a damping device (11) according to any one of the preceding claims, the damping device (11) being fixedly connected to the insulating pull rod (12) of the circuit breaker via the first through hole (112).

11. The circuit breaker according to claim 10, characterized in that, The insulating rod (12) also includes an insulating rod cover (121) and a mounting section (122) extending inside the insulating rod cover (121), wherein the damping device (11) is fixedly installed in the mounting section (122) of the insulating rod (12).

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