Energy absorbing device for a circuit breaker

Abstract

The utility model relates to a universal circuit breaker energy absorption device, the universal circuit breaker energy absorption device includes: the casing is hollow structure, movable contact mechanism, the movable contact mechanism includes support seat, the support seat lower end rotatablely arranged in the inside bottom of casing, energy absorption structure is high temperature resistant viscoelastic material, sets up in the inside front end of casing, wherein, when the universal circuit breaker breaks, the support seat rotates to the breaking position around the rotation axis of lower end, the support seat front end collision contact energy absorption structure, because energy absorption structure adopts high temperature resistant viscoelastic material, after being forced, friction and hysteresis deformation occur, convert kinetic energy into heat energy, make the collision kinetic energy of support seat and inside reduce, thereby reduce the rebound force of collision kinetic energy conversion, the rebound distance of support seat and casing collision is obviously reduced, greatly reduced the possibility of arc restrike.

Description

Technical Field

[0001] This utility model relates to the field of universal circuit breaker technology, and in particular to a universal circuit breaker energy absorption device. Background Technology

[0002] Because universal circuit breakers trip very quickly and their mechanisms are made of rigid materials, the moving contact mechanism experiences severe rebound after high-speed impact with the housing under contact pressure and electric repulsion. The rebound amplitude can reach more than half of the maximum opening distance between the moving and stationary contacts, and the moving and stationary contacts may even re-engage, causing the arc to fail to extinguish in time or even reignite, resulting in the burning of the moving and stationary contacts and even more serious consequences.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a universal circuit breaker energy absorption device to solve the problem of excessive rebound amplitude of the moving contact mechanism hitting the housing during the opening of the universal circuit breaker, which leads to reignition.

[0005] The technical solution adopted in this utility model is as follows: The universal circuit breaker energy absorption device includes: a housing, which is a hollow structure; a moving contact mechanism, which includes a support base, the lower end of which is rotatably disposed on the bottom inner side of the housing; and an energy absorption structure, which is made of high-temperature resistant viscoelastic material and is disposed on the front inner side of the housing. When the universal circuit breaker breaks, the support base rotates around the rotation axis at its lower end to the breaking position, and the front end of the support base collides with and contacts the energy absorption structure.

[0006] A further technical solution is that the front end of the support base has a plane, the rear end of the energy-absorbing structure is a plane, the support base rotates around the rotation axis at the lower end to the break position, and the plane at the front end of the support base contacts the plane at the rear end of the energy-absorbing structure.

[0007] A further technical solution is that a slot is opened at the front end of the inner side of the housing, the energy-absorbing structure is locked in the slot, and the rear end of the energy-absorbing structure protrudes from the inner surface of the housing.

[0008] A further technical solution is that a groove is opened at the front end of the housing for the support seat to be inserted into. The support seat rotates around the rotation axis at the lower end to the break position, and the support seat is inserted into the groove. The slot is opened at the front end of the inner side of the groove.

[0009] A further technical solution is that the energy-absorbing structure is made of high-temperature resistant and flame-retardant rubber.

[0010] A further technical solution is that the moving contact mechanism includes: a bracket, fixed to the bottom of the inner side of the housing; a moving busbar, fixed to the bracket and passing through the rear end of the housing; and two clamping plates, the lower end of which is rotatably connected to both sides of the bracket and the upper end is fixed to both sides of the support base.

[0011] A further technical solution is that the moving contact mechanism further includes a shaft fork, the rear end of which passes through the housing and is hinged to the front end of the support base; the universal circuit breaker energy absorption device further includes an operating mechanism, the operating mechanism is fixed to the front end of the housing, the main shaft rotatably passes through the operating mechanism, and several cantilever arms are fixedly sleeved on the main shaft, one of which is connected to the output end of the operating mechanism, and the rear ends of the remaining cantilever arms are hinged to the shaft fork.

[0012] A further technical solution is that the energy-absorbing structure has two parts, which are symmetrically arranged on the left and right sides of the shaft fork.

[0013] A further technical solution is that the energy-absorbing structure is bonded to the inner front end of the shell.

[0014] A further technical solution is that a number of partitions are arranged at intervals along the length of the housing on the inner side of the housing, and the partitions divide the interior of the housing into a number of cavities, with a set of moving contact mechanisms and energy absorption structures arranged in each cavity.

[0015] The beneficial effects of this utility model embodiment are as follows: (I) The universal circuit breaker energy absorption device of this utility model embodiment, by setting an energy absorption structure at the front end of the inner side of the housing, when the universal circuit breaker breaks, the support seat rotates to the breaking position around the rotation axis of the lower end of the clamp plate under the pressure of the contact and the electric repulsive force. The front end of the support seat collides with the energy absorption structure. Since the energy absorption structure is made of high temperature resistant viscoelastic material, it undergoes friction and hysteresis deformation after being subjected to force, converting kinetic energy into heat energy, thereby reducing the collision kinetic energy between the support seat and the inner side of the housing, thereby reducing the rebound force of the collision kinetic energy conversion. The rebound distance after the support seat collides with the housing is significantly reduced, greatly reducing the possibility of arc reignition.

[0016] (ii) Furthermore, the front end of the support base is flat, and the rear end of the energy-absorbing structure is flat. The flat surface of the front end of the support base is in contact with the flat surface of the rear end of the energy-absorbing structure, thereby increasing the contact area and improving the energy absorption efficiency.

[0017] (iii) Furthermore, a slot is formed at the front end of the inner side of the shell, and the energy-absorbing structure is engaged in the slot, with the rear end of the energy-absorbing structure protruding from the inner surface of the shell. Specifically, the slot is formed at the front end of the inner side of the groove, increasing the thickness of the energy-absorbing structure, increasing the deformation of the energy-absorbing structure, and improving the energy absorption efficiency. Attached Figure Description

[0018] Figure 1 This is an isometric view of the universal circuit breaker energy absorption device of this utility model.

[0019] Figure 2 This is a rear view structural schematic diagram of the universal circuit breaker energy absorption device of this utility model.

[0020] Figure 3 for Figure 2 Sectional view at AA.

[0021] Figure 4 This is an isometric view of the moving contact mechanism and main shaft in the universal circuit breaker energy absorption device of this utility model.

[0022] In the picture: 1. Housing; 11. Groove; 12. Slot; 13. Partition; 2. Moving contact mechanism; 21. Bracket; 211. Shaft; 22. Moving busbar; 23. Clamping plate; 24. Support seat; 25. Shaft fork; 3. Operating mechanism; 31. Main shaft; 32. Cantilever; 4. Energy absorption structure. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0024] Example: This embodiment discloses a universal circuit breaker energy absorption device.

[0025] The universal circuit breaker energy absorption device includes a housing 1, a moving contact mechanism 2, and an energy absorption structure 4.

[0026] like Figure 1 and Figure 2 As shown, the housing 1 has a hollow structure. The moving contact mechanism 2 includes a support base 24, the lower end of which is rotatably disposed on the bottom inner side of the housing 1. Exemplarily, the moving contact mechanism 2 includes a bracket 21, a moving busbar 22, and a clamping plate 23. The bracket 21 is fixed to the bottom inner side of the housing 1. The moving busbar 22 is fixed to the bracket 21 and passes through the rear end of the housing 1. There are two clamping plates 23, the lower ends of which are rotatably connected to both sides of the bracket 21, and the upper ends are fixed to both sides of the support base 24. Specifically, shafts 211 are provided on both sides of the bracket 21, the shafts 211 pass through the lower ends of the clamping plates 23, and the axis of the shafts 211 is the rotation axis.

[0027] The energy-absorbing structure 4 is made of a high-temperature resistant viscoelastic material and is disposed on the inner front end of the housing 1. For example, the energy-absorbing structure 4 is bonded to the inner front end of the housing 1 using epoxy resin adhesive. The energy-absorbing structure 4 uses a high-temperature resistant flame-retardant rubber, such as commercially available silicone rubber, fluororubber, p-silicone rubber, and fluorosilicone rubber.

[0028] like Figure 3 As shown, when the universal circuit breaker breaks, the support base 24 rotates around the rotation axis at its lower end to the breaking position, and the front end of the support base 24 collides with the energy-absorbing structure 4. Preferably, the front end of the support base 24 has a plane, and the rear end of the energy-absorbing structure 4 is a plane. The plane at the front end of the support base 24 contacts the plane at the rear end of the energy-absorbing structure 4, increasing the contact area to improve energy absorption efficiency.

[0029] like Figure 2 and Figure 3 As shown, further, a groove 11 is provided at the front end of the inner side of the housing 1 for the support seat 24 to be inserted. The support seat 24 rotates around the rotation axis at the lower end to the break position, and the support seat 24 is inserted into the groove 11, increasing the maximum opening distance between the stationary contact and the moving contact, so as to meet the insulation distance requirements between the moving contact and the stationary contact under high voltage and also take into account the requirements for arc extinguishing.

[0030] like Figure 3 As shown, further, a slot 12 is formed at the front end of the inner side of the housing 1, and the energy-absorbing structure 4 is engaged in the slot 12, with the rear end of the energy-absorbing structure 4 protruding from the inner surface of the housing 1. Specifically, the slot 12 is formed at the front end of the inner side of the groove 11, increasing the thickness of the energy-absorbing structure 4, increasing the deformation of the energy-absorbing structure 4, and improving the energy absorption efficiency.

[0031] like Figure 1 and Figure 4 As shown, the moving contact mechanism 2 further includes a shaft fork 25, the rear end of which passes through the housing 1 and is hinged to the front end of the support base 24. The universal circuit breaker energy absorption device also includes an operating mechanism 3, which is fixed to the front end of the housing 1. The main shaft 31 rotatably passes through the operating mechanism 3, and several cantilever arms 32 are fixedly sleeved on the main shaft 31. One cantilever arm 32 is connected to the output end of the operating mechanism 3, and the rear ends of the other cantilever arms 32 are hinged to the shaft fork 25. The output end of the operating mechanism 3 drives the cantilever arm 32 connected to it to rotate. The cantilever arm 32 drives the main shaft 31 and the other cantilever arms 32 to rotate together. The rotation of the cantilever arm 32 pulls the shaft fork 25 and the moving contact mechanism 2, so that the moving contact mechanism 2 and the stationary contact mechanism are closed or opened.

[0032] like Figure 2As shown, the energy-absorbing structure 4 further comprises two pieces, symmetrically arranged on the left and right sides of the shaft fork 25, avoiding the shaft fork 25 while ensuring uniform energy absorption and preventing the support base 24 from wobbling. Of course, the energy-absorbing structure 4 can also be other shapes, such as circular, frame-shaped, or ring-shaped, as long as it can avoid the shaft fork 25 and ensure uniform energy absorption.

[0033] like Figure 1 and Figure 2 As shown, furthermore, a plurality of partitions 13 are spaced apart along the length of the housing 1 on the inner side of the housing 1. The partitions 13 divide the interior of the housing 1 into a plurality of cavities, and each cavity is provided with a set of moving contact mechanisms 2 and energy-absorbing structures 4. When the universal circuit breaker interrupts a large current, the partitions 13 can increase the electrical clearance and creepage distance, effectively block the propagation of interphase arc, and improve the safety and reliability of the universal circuit breaker.

[0034] The universal circuit breaker of this embodiment was tested at rated operating short-circuit breaking capacity Ics, rated ultimate short-circuit breaking capacity Icu, and rated short-time withstand current Icw under rated operating voltages of AC800V, AC1000V, AV1140V, and AV1500V. The test results were qualified. The universal circuit breaker can safely interrupt the expected short-circuit current and can be reused. The universal circuit breaker showed no signs of excessive damage, did not endanger the operator, and did not produce continuous arcing, flashover between poles or between pole pairs, arcing faults, or the fuse in the detection circuit not blowing.

[0035] In this embodiment, by setting an energy-absorbing structure 4 at the front end of the inner side of the housing 1, when the universal circuit breaker breaks, the support seat 24 rotates around the rotation axis of the lower end of the clamping plate 23 to the breaking position under the pressure of the contact and the electric repulsive force. The front end of the support seat 24 collides with the energy-absorbing structure 4. Since the energy-absorbing structure 4 is made of high-temperature viscoelastic material, it undergoes friction and hysteresis deformation after being subjected to force, converting kinetic energy into heat energy. This reduces the collision kinetic energy between the support seat 24 and the inner side of the housing 1, thereby reducing the rebound force converted from collision kinetic energy. The rebound distance of the support seat 24 after colliding with the housing 1 is significantly reduced, greatly reducing the possibility of arc reignition.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A universal circuit breaker energy absorption device, characterized in that, The universal circuit breaker energy absorption device includes: The shell is a hollow structure; A moving contact mechanism, the moving contact mechanism including a support base, the lower end of the support base being rotatably disposed on the bottom inner side of the housing; The energy-absorbing structure, made of a high-temperature resistant viscoelastic material, is located at the front end of the inner side of the shell. When the universal circuit breaker breaks, the support base rotates around the rotation axis at its lower end to the breaking position, and the front end of the support base collides with and contacts the energy-absorbing structure.

2. The universal circuit breaker energy absorption device according to claim 1, characterized in that: The front end of the support base has a flat surface, and the rear end of the energy-absorbing structure has a flat surface. The support base rotates around the rotation axis at its lower end to the break position, and the flat surface at the front end of the support base contacts the flat surface at the rear end of the energy-absorbing structure.

3. The universal circuit breaker energy absorption device according to claim 2, characterized in that: A slot is provided at the front end of the inner side of the housing, the energy-absorbing structure is engaged in the slot, and the rear end of the energy-absorbing structure protrudes from the inner surface of the housing.

4. The universal circuit breaker energy absorption device according to claim 3, characterized in that: The front end of the housing has a groove for the support seat to be inserted. The support seat rotates around the rotation axis at the lower end to the break position, and the support seat is inserted into the groove. The slot is opened at the front end of the inner side of the groove.

5. The universal circuit breaker energy absorption device according to claim 1, characterized in that: The energy-absorbing structure is made of high-temperature resistant and flame-retardant rubber.

6. The universal circuit breaker energy absorption device according to claim 1, characterized in that: The moving contact mechanism includes: The bracket is fixed to the bottom inner side of the housing; The moving busbar is fixed on the bracket and passes through the rear end of the housing; The clamp has two plates, the lower end of which is rotatably connected to both sides of the bracket, and the upper end is fixed to both sides of the support base.

7. The universal circuit breaker energy absorption device according to claim 1, characterized in that: The moving contact mechanism also includes a shaft fork, the rear end of which passes through the housing and is hinged to the front end of the support base; the universal circuit breaker energy absorption device also includes an operating mechanism, which is fixed to the front end of the housing, and a main shaft rotatably passes through the operating mechanism. Several cantilever arms are fixedly sleeved on the main shaft, one of which is connected to the output end of the operating mechanism, and the rear ends of the remaining cantilever arms are hinged to the shaft fork.

8. The universal circuit breaker energy absorption device according to claim 7, characterized in that: The energy-absorbing structure consists of two parts, symmetrically arranged on the left and right sides of the shaft fork.

9. The universal circuit breaker energy absorption device according to claim 1, characterized in that: The energy-absorbing structure is bonded to the inner front end of the shell.

10. The universal circuit breaker energy absorption device according to claim 1, characterized in that: The inner side of the housing is provided with several partitions at intervals along the length of the housing. The partitions divide the interior of the housing into several cavities. Each cavity is provided with a set of moving contact mechanism and energy absorption structure.

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