Universal circuit breaker energy absorption device

Abstract

The invention relates to a universal circuit breaker energy absorption device, and the device comprises a housing which is of a hollow structure; the moving contact mechanism comprises a supporting seat, and the lower end of the supporting seat is rotatably arranged at the bottom of the inner side of the shell; the energy absorption structure is made of a high-temperature-resistant viscoelastic material and is arranged at the front end of the inner side of the shell; when the universal circuit breaker is switched off, the supporting seat rotates around the rotating axis at the lower end to a switching-off position, the front end of the supporting seat is in collision contact with the energy absorption structure, the energy absorption structure is made of a high-temperature-resistant viscoelastic material, friction and lag deformation are generated after the energy absorption structure is stressed, kinetic energy is converted into heat energy, and the energy absorption structure is in contact with the energy absorption structure. The collision kinetic energy between the supporting seat and the inner side of the shell is reduced, so that the resilience force converted from the collision kinetic energy is reduced, the resilience distance is obviously reduced after the supporting seat collides with the shell, and the possibility of electric arc reignition is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of universal circuit breaker, in particular to an energy absorption device of a universal circuit breaker. BACKGROUND

[0002] Since the universal circuit breaker trips very fast, and the mechanism of the universal circuit breaker is made of rigid material, when the universal circuit breaker trips, the movable contact mechanism will hit the shell at high speed under the action of contact pressure and electric repulsion force, and the rebound phenomenon is serious, the rebound amplitude can reach more than half of the maximum opening distance of the movable and static contacts, and even the movable and static contacts will contact again, which will cause the arc not to be extinguished in time or even the arc to reignite, and the movable and static contacts will be burned, and even more serious consequences will be caused.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] In view of the deficiencies of the prior art, the embodiments of the present application disclose an energy absorption device of a universal circuit breaker to solve the problem that the rebound amplitude of the movable contact mechanism hitting the shell is too large when the universal circuit breaker trips, which causes reignition.

[0005] The technical solutions adopted by the present application are as follows: The energy absorption device of the universal circuit breaker comprises a shell, which is a hollow structure; a movable contact mechanism, which comprises a support seat, the lower end of the support seat being rotatably arranged on the inside bottom of the shell; and an energy absorption structure, which is made of a high-temperature-resistant viscoelastic material and is arranged on the inside front end of the shell; wherein when the universal circuit breaker trips, the support seat rotates around the rotation axis at the lower end to a tripping position, and the front end of the support seat collides with the energy absorption structure.

[0006] Further, the front end of the support seat has a flat surface, the rear end of the energy absorption structure is a flat surface, the support seat rotates around the rotation axis at the lower end to the tripping position, and the flat surface at the front end of the support seat is in surface contact with the flat surface at the rear end of the energy absorption structure.

[0007] Further, a clamping groove is formed on the inside front end of the shell, the energy absorption structure is clamped in the clamping groove, and the rear end of the energy absorption structure protrudes from the inside surface of the shell.

[0008] Further, a recess is formed on the inside front end of the shell for clamping the support seat, the support seat rotates around the rotation axis at the lower end to the tripping position, the support seat is clamped in the recess, and the clamping groove is formed on the inside front end of the recess. Further, a recess is formed on the inside front end of the shell for clamping the support seat, the support seat rotates around the rotation axis at the lower end to the tripping position, the support seat is clamped in the recess, and the clamping groove is formed on the inside front end of the recess.

[0009] Further, the energy-absorbing structure is high-temperature-resistant and flame-retardant rubber.

[0010] Further, the movable contact mechanism comprises a support fixed to the inner bottom of the shell, a movable bus fixed to the support and passing through the rear end of the shell, and two clamping plates rotatably connected to the two sides of the support at the lower ends and fixed to the two sides of the support seat at the upper ends.

[0011] Further, the movable contact mechanism further comprises a shaft fork, the rear end of the shaft fork passing through the shell and being hingedly connected to the front end of the support seat, and the energy-absorbing device further comprises an operating mechanism fixed to the front end of the shell, a main shaft rotatably passing through the operating mechanism, and a plurality of cantilevers fixed to the main shaft, one of the cantilevers being connected to the output end of the operating mechanism and the rear ends of the remaining cantilevers being hingedly connected to the shaft fork.

[0012] Further, the energy-absorbing structure has two parts symmetrically arranged on the left and right sides of the shaft fork.

[0013] Further, the energy-absorbing structure is bonded to the front end of the inner side of the shell.

[0014] Further, a plurality of partitions are arranged at intervals along the length of the shell on the inner side of the shell, the partitions dividing the interior of the shell into a plurality of cavities, and each cavity is correspondingly provided with a set of movable contact mechanisms and energy-absorbing structures.

[0015] The beneficial effects of the embodiment of the present application are as follows: (1) The energy-absorbing device of the universal circuit breaker of the embodiment of the present application is provided with an energy-absorbing structure at the front end of the inner side of the shell, when the universal circuit breaker is broken, the support seat is rotated to the breaking position around the rotation axis of the lower end of the clamping plate under the contact pressure and the electric repulsion, the front end of the support seat collides with the energy-absorbing structure, the energy-absorbing structure is made of high-temperature-resistant viscoelastic material, and after being subjected to force, it is deformed by friction and hysteresis, thereby converting kinetic energy into heat energy, reducing the collision kinetic energy between the support seat and the inner side of the shell, reducing the rebound force converted from the collision kinetic energy, and significantly reducing the rebound distance of the support seat after colliding with the shell, thereby greatly reducing the possibility of arc reignition.

[0016] (2) Further, the front end of the support seat has a flat surface, the rear end of the energy-absorbing structure is also a flat surface, and the flat surface of the front end of the support seat is in surface contact with the flat surface of the rear end of the energy-absorbing structure, thereby increasing the contact area and improving the energy-absorbing efficiency.

[0017] Further, a clamping groove is formed at the front end of the inner side of the shell, the energy absorption structure is clamped in the clamping groove, and the rear end of the energy absorption structure protrudes from the inner side surface of the shell. Specifically, the clamping groove is formed at the front end of the inner side of the groove, the thickness of the energy absorption structure is increased, the deformation amount of the energy absorption structure is increased, and the energy absorption efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a perspective view of the energy absorption device of the universal circuit breaker of the application.

[0019] Figure 2 It is a rear view structural schematic diagram of the energy absorption device of the universal circuit breaker of the application.

[0020] Figure 3 It is Figure 2 The section view at A-A.

[0021] Figure 4 It is a perspective view of the moving contact mechanism and the main shaft in the energy absorption device of the universal circuit breaker of the application.

[0022] In the figure: 1, shell; 11, groove; 12, clamping groove; 13, partition plate; 2, moving contact mechanism; 21, support; 211, shaft body; 22, moving bus; 23, clamping plate; 24, support seat; 25, shaft fork; 3, operating mechanism; 31, main shaft; 32, cantilever; 4, energy absorption structure. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical means and effects adopted by the application to achieve the predetermined application purpose, the specific embodiments, structures, features and effects according to the application are described in detail below in combination with the drawings and preferred embodiments.

[0024] Embodiment: The embodiment discloses an energy absorption device of a universal circuit breaker.

[0025] The energy absorption device of the universal circuit breaker comprises a shell 1, a moving contact mechanism 2 and an energy absorption structure 4.

[0026] As shown in Figure 1 and Figure 2 , the shell 1 is a hollow structure. The moving contact mechanism 2 comprises a support seat 24, and the lower end of the support seat 24 is rotatably arranged at the inner bottom of the shell 1. The moving contact mechanism 2 comprises a support 21, a moving bus 22 and a clamping plate 23. The support 21 is fixed to the inner bottom of the shell 1. The moving bus 22 is fixed to the support 21 and passes through the rear end of the shell 1. The clamping plate 23 has two clamping plates, and the lower ends of the clamping plates are rotatably connected to the two sides of the support 21, and the upper ends of the clamping plates are fixed to the two sides of the support seat 24. Specifically, shaft bodies 211 are arranged on the two sides of the support 21, the shaft bodies 211 pass through the lower ends of the clamping plates 23, and the shaft centers of the shaft bodies 211 are the rotation shaft centers.

[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, further, the energy-absorbing structure 4 has two blocks symmetrically arranged on the left and right sides of the shaft fork 25, avoiding the shaft fork 25 while ensuring uniform energy absorption, avoiding the shaking of the support seat 24. Of course, the energy-absorbing structure 4 can also be other shapes, such as circular, frame type, ring type, etc., as long as it can avoid the shaft fork 25 and ensure uniform energy absorption.

[0033] As shown in Figure 1 and Figure 2 As shown, further, the inside of the shell 1 is provided with a plurality of partitions 13 along the length direction of the shell 1, and the partitions 13 divide the inside of the shell 1 into a plurality of cavities, and each cavity is provided with a set of movable contact mechanisms 2 and energy-absorbing structures 4. When the universal circuit breaker breaks a large current, the partitions 13 can increase the electrical gap and the creepage distance, effectively block the spread of interphase arc, and improve the safety and reliability of the universal circuit breaker.

[0034] The universal circuit breaker of the present embodiment is tested for rated operating short-circuit breaking capacity Ics, rated limit short-circuit breaking capacity Icu, and rated short-time withstand current Icw under rated working voltages AC800V, AC1000V, AV1140V, and AV1500V, and the test results are qualified. The universal circuit breaker can safely break the expected short-circuit current and can be reused. There is no sign of excessive damage, no danger to the operator, no continuous arc, no flashover between poles or pole pairs, no arc flying failure, and no fuse in the detection circuit that does not melt.

[0035] In the present embodiment, by providing the energy-absorbing structure 4 at the front end of the inside of the shell 1, when the universal circuit breaker breaks, the support seat 24 is pushed by the contact pressure and the electric repulsion force and rotates around the rotation axis at the lower end of the clamping plate 23 to the breaking position, and 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-resistant viscoelastic material, it will deform and rub after being stressed, converting kinetic energy into heat energy, reducing the collision kinetic energy between the support seat 24 and the inside of the shell 1, thereby reducing the rebound force converted from the collision kinetic energy. After the support seat 24 collides with the shell 1, the rebound distance is significantly reduced, greatly reducing the possibility of arc reignition.

[0036] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the scope of the technical solution of the present application, and any equivalent embodiments with equivalent changes and modifications made to the above embodiments based on the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A power circuit breaker energy absorbing device, characterized by, The energy absorption device of the universal circuit breaker comprises: a shell, which is a hollow structure; a movable contact mechanism, which comprises a support base, the lower end of the support base being rotatably arranged on the inside bottom of the shell; an energy absorption structure, which is made of a high-temperature-resistant viscoelastic material and is arranged at the front end of the inside of the shell; wherein, when the universal circuit breaker is broken, the support base rotates around the rotation axis at the lower end to the breaking position, and the front end of the support base collides with the energy absorption structure.

2. The energy absorbing device of claim 1, wherein: The front end of the support base has a flat surface, the rear end of the energy absorption structure is also a flat surface, the support base rotates around the rotation axis at the lower end to the breaking position, and the flat surface of the front end of the support base is in surface contact with the flat surface of the rear end of the energy absorption structure.

3. The energy absorbing device of claim 2, wherein: A clamping groove is formed at the front end of the inside of the shell, the energy absorption structure is clamped in the clamping groove, and the rear end of the energy absorption structure protrudes from the inside surface of the shell.

4. The energy absorbing device of claim 3, wherein: A recess is formed at the front end of the inside of the shell for clamping the support base, the support base rotates around the rotation axis at the lower end to the breaking position, the support base is clamped in the recess, and the clamping groove is formed at the front end of the inside of the recess.

5. The energy absorbing device of claim 1, wherein: The energy absorption structure is made of high-temperature-resistant fire-retardant rubber.

6. The energy absorbing device of claim 1, wherein: The movable contact mechanism comprises: a bracket, which is fixed to the inside bottom of the shell; a movable bus, which is fixed to the bracket and passes through the rear end of the shell; two clamping plates, the lower ends of which are rotatably connected to the two sides of the bracket, and the upper ends of which are fixed to the two sides of the support base.

7. The energy absorbing device of claim 1, wherein: The movable contact mechanism further comprises a shaft fork, the rear end of the shaft fork passing through the shell and being hingedly connected to the front end of the support base; the energy absorption device of the universal circuit breaker further comprises an operating mechanism, the operating mechanism being fixed to the front end of the shell, a main shaft rotatably passing through the operating mechanism, a plurality of cantilevers being fixedly sleeved on the main shaft, one of the cantilevers being connected to the output end of the operating mechanism, and the rear ends of the remaining cantilevers being hingedly connected to the shaft fork.

8. The energy absorbing device of claim 7, wherein: The energy absorption structure has two parts, which are symmetrically arranged on the left and right sides of the shaft fork.

9. The energy absorbing device of claim 1, wherein: The energy absorption structure is bonded to the front end of the inside of the shell.

10. The energy absorbing device of claim 1, wherein: A plurality of partitions are arranged at intervals along the length of the shell on the inside of the shell, the partitions dividing the inside of the shell into a plurality of cavities, and a set of movable contact mechanisms and energy absorption structures are arranged in each cavity.

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