Circuit breaker single phase and circuit breaker

Abstract

The invention provides a circuit breaker single phase and a circuit breaker, which are applied to the technical field of medium-voltage complete electric appliances, two ends of a vacuum arc extinguish chamber shell of the circuit breaker single phase are respectively provided with a static wire outlet seat and a movable wire outlet seat, and a movable contact arranged in the shell comprises an electric connection section located outside the arc extinguish chamber shell. The electric connection section is provided with a plurality of wiring surfaces fixed with flexible connections around the axis of the moving contact in the circumferential direction, the moving contact abuts against the moving outlet seat through the flexible connections to realize electric connection, the flexible connections are arranged in one-to-one correspondence with the wiring surfaces of the electric connection section, and the moving outlet seat is internally provided with a moving space for the flexible connections to move along with the moving contact. Through the elastic deformability of the flexible connection, the moving contact can always keep in contact with the moving outgoing line seat and has enough through-flow area in the moving process, so that the stability of the electric connection between the moving contact and the moving outgoing line seat in the linear sliding process and the through-flow capability of adapting to high-capacity current are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of medium-voltage complete electrical appliances in the power supply and distribution industry, and in particular relates to a single-phase circuit breaker and a circuit breaker. Background Art

[0002] In the field of medium-voltage complete electrical equipment technology in the power supply and distribution industry, for example, for pumped storage power stations, which are operated frequently, installing generator circuit breakers between the units and transformers is an inevitable choice. However, the generator outlet circuit breakers that can meet the needs of newly built pumped storage power stations are currently all SF 6 The product is not environmentally friendly, and the price and after-sales service are very expensive and inconvenient. The operation and maintenance cycle of the vacuum circuit breaker is much shorter than that of the SF 6 The circuit breaker is very long, which can greatly reduce the procurement and operation and maintenance costs of pumped-storage power station related equipment and improve the controllability of the related product supply chain.

[0003] However, for vacuum circuit breakers, in the prior art, vacuum interrupters of large-capacity generator vacuum circuit breakers usually adopt a horizontal structure, including a horizontally arranged vacuum interrupter, a static outlet seat and a moving outlet seat are respectively arranged at both ends of the vacuum interrupter, and supporting sleeves are respectively arranged at the lower ends of the static outlet seat and the moving outlet seat, that is, the moving contact is placed horizontally along the axial direction. For example, a Chinese invention patent application with application publication number CN101710545A and titled A Horizontal Vacuum Circuit Breaker for High-Voltage AC Generator adopts a horizontal vacuum circuit breaker, including a steel frame fixed parallel to a steel frame. A three-phase horizontal switching device on a frame, each single-phase horizontal switching device comprises a moving end support insulator and a static end support insulator fixed on the steel frame, a vacuum arc extinguishing chamber is arranged between the moving end aluminum bracket and the static end aluminum bracket, the moving end of the vacuum arc extinguishing chamber comprises a moving rod, a moving contact arranged at the right end of the moving rod, a sliding contact arranged at the left end of the moving rod and a push rod fixed at the left end of the sliding contact, the cross-section of the moving end aluminum bracket is a hollow rectangle, the push rod and the sliding contact extend into the moving end aluminum bracket, a spring contact finger is arranged at the right end of the moving end aluminum bracket, and the spring contact finger is electrically connected to the sliding contact.

[0004] In the above structure, since the contact area between the spring contact finger and the sliding contact is limited and the moving contact is often in motion, the spring contact finger may fail easily, and the electrical connection between the moving contact and the moving lead-out socket of the vacuum circuit breaker may be unstable and the current carrying capacity under large current may not be guaranteed. Summary of the invention

[0005] The purpose of the present invention is to provide a single-phase circuit breaker, which can solve the technical problems of unstable electrical connection between the moving contact of a large-capacity vacuum circuit breaker and the moving outlet seat during movement and difficulty in adapting to the flow capacity of large-capacity current in the prior art. Another purpose of the present invention is to provide a circuit breaker including the single-phase circuit breaker.

[0006] A single-phase circuit breaker technical solution of the present invention is: A single-phase circuit breaker comprises a vacuum interrupter, wherein a static outlet seat and a moving outlet seat are fixedly provided at both ends of a shell of the vacuum interrupter, respectively; a moving contact is arranged in the shell, and the moving contact comprises an electrical connection section located outside the shell of the interrupter, wherein a plurality of wiring surfaces are arranged circumferentially around an axis of the moving contact; a flexible connection is fixedly provided on the plurality of wiring surfaces of the electrical connection section, and the moving contact abuts against the moving outlet seat through the flexible connection to realize electrical connection; the flexible connection is arranged in a one-to-one correspondence with the wiring surface of the electrical connection section, and a movable space is provided inside the moving outlet seat for the flexible connection to move with the moving contact.

[0007] Beneficial effect: The single-phase circuit breaker of the present invention is an improved invention. The present invention improves the structure of the moving contact, an electrical connection section is provided outside the arc extinguishing chamber housing of the moving contact, and multiple wiring surfaces are provided around the axis of the moving contact in the circumferential direction of the electrical connection section, and soft connections are fixedly provided on the multiple wiring surfaces of the electrical connection section. The moving contact is electrically connected to the moving outlet seat through the soft connection, and the soft connection is arranged one-to-one with the wiring surface of the electrical connection section. The moving outlet seat has a movable space for the soft connection to move with the moving contact. Since the soft connection has a certain elasticity, it can always maintain sufficient flow area in contact with the moving outlet seat during the movement of the moving contact, so it can solve the technical problems of unstable electrical connection between the moving contact and the moving outlet seat due to the unstable shaking of the moving contact during the linear sliding of the moving contact of the vacuum circuit breaker and the difficulty in adapting to the flow capacity of large-capacity current.

[0008] Furthermore, the flexible connection is an annular flexible connection having an internal cavity, and the annular flexible connection is fixedly connected to the wiring surface of the electrical connection section through a connecting piece, and the top surface of the annular flexible connection abuts against the movable outlet seat.

[0009] Beneficial effect: The annular flexible connection with an internal cavity can further improve the elastic deformation adaptability of the flexible connection, and can better ensure the electrical connection effect between the electrical connection section and the moving lead-out seat during the movement of the moving contact.

[0010] Furthermore, gaps are provided on the multiple wiring surfaces of the electrical connection section.

[0011] Beneficial effect: The setting of the gap on the wiring surface of the electrical connection section reduces the generation of eddy current.

[0012] Furthermore, the electrical connection section is a regular polyhedral column section.

[0013] Beneficial effect: The setting of the regular multi-faceted column section improves the electrical connection effect between the moving contact and the moving lead-out seat during the linear movement of the moving contact.

[0014] Furthermore, a stepped countersunk hole is provided in the axial direction of the moving contact, and a stepped surface fixedly connected to a driving connecting rod of the moving contact driving mechanism is provided in the stepped countersunk hole.

[0015] Beneficial effect: By setting a stepped countersunk hole in the moving contact, part of the transmission parts of the driving mechanism can be placed inside it, saving the transmission connection space. On the other hand, due to the setting of the stepped countersunk hole, the weight of the moving contact is also reduced, and accordingly, the material cost is also reduced.

[0016] Furthermore, the moving contact driving mechanism includes a driving connecting rod, a connecting rod, a double crutch arm and an insulating pull rod connected in sequence, one end of the connecting rod is connected to the driving connecting rod, and the other end of the connecting rod is connected to the double crutch arm. One of the double crutch arms drives the moving contact to move linearly through the connecting rod and the driving connecting rod, and the other serves as an input section to transmit the motion through the insulating pull rod.

[0017] Beneficial effects: The transmission structure is simplified and the transmission efficiency is improved.

[0018] Furthermore, the driving connecting rod and the connecting rod of the moving contact driving mechanism are located in the stepped counterbore, and one end of the driving connecting rod is fixedly connected to the stepped surface through a flange.

[0019] Beneficial effect: some transmission parts of the driving mechanism are placed inside it, saving transmission connection space.

[0020] Furthermore, a supporting sleeve is provided at the lower end of the corresponding movable outlet seat, and the insulating pull rod is located inside the supporting sleeve.

[0021] Beneficial effects: The transmission structure is simple and convenient for driving the connecting rod and supporting the movable outlet seat.

[0022] Furthermore, the static outlet seat and the dynamic outlet seat are fixedly connected via an insulating support rod, and the insulating support rod is arranged along the peripheral side of the vacuum arc extinguishing chamber.

[0023] Beneficial effect: The effective support between the static outlet seat and the dynamic outlet seat is improved, and the stability of the horizontal arrangement of the vacuum circuit breaker is further improved.

[0024] A technical solution of a circuit breaker of the present invention is: A circuit breaker comprises a vacuum arc extinguishing chamber, wherein a static outlet seat and a moving outlet seat are fixedly provided at both ends of a shell of the vacuum arc extinguishing chamber, respectively, a moving contact is arranged in the shell, the moving contact comprises an electrical connection section located outside the shell of the arc extinguishing chamber, a plurality of wiring surfaces are arranged circumferentially around an axis of the moving contact in the electrical connection section, a flexible connection is fixedly provided on the plurality of wiring surfaces of the electrical connection section, the moving contact abuts against the moving outlet seat through the flexible connection to achieve electrical connection, the flexible connection is arranged in a one-to-one correspondence with the wiring surface of the electrical connection section, and a movable space is provided inside the moving outlet seat for the flexible connection to move with the moving contact.

[0025] Beneficial effects: The circuit breaker of the present invention is an improved invention. The present invention improves the structure of the moving contact, an electrical connection section is provided outside the arc extinguishing chamber housing of the moving contact, and multiple wiring surfaces are provided around the axis of the moving contact in the circumferential direction of the electrical connection section, and soft connections are fixedly provided on the multiple wiring surfaces of the electrical connection section. The moving contact is electrically connected to the moving outlet seat through the soft connection, and the soft connection is arranged one-to-one with the wiring surface of the electrical connection section. The moving outlet seat has a movable space for the soft connection to move with the moving contact. Since the soft connection has a certain elasticity, it can always maintain sufficient flow area in contact with the moving outlet seat during the movement of the moving contact, so it can solve the technical problems of unstable electrical connection between the moving contact and the moving outlet seat and difficulty in adapting to the flow capacity of large capacity current due to the unstable shaking of the moving contact during the linear sliding of the moving contact of the vacuum circuit breaker.

[0026] Furthermore, the flexible connection is an annular flexible connection having an internal cavity, and the annular flexible connection is fixedly connected to the wiring surface of the electrical connection section through a connecting piece, and the top surface of the annular flexible connection abuts against the movable outlet seat.

[0027] Beneficial effect: The annular flexible connection with an internal cavity can further improve the elastic deformation adaptability of the flexible connection, and can better ensure the electrical connection effect between the electrical connection section and the moving lead-out seat during the movement of the moving contact.

[0028] Furthermore, gaps are provided on the multiple wiring surfaces of the electrical connection section.

[0029] Beneficial effect: The setting of the gap on the wiring surface of the electrical connection section reduces the generation of eddy current.

[0030] Furthermore, the electrical connection section is a regular polyhedral column section.

[0031] Beneficial effect: The setting of the regular multi-faceted column section improves the electrical connection effect between the moving contact and the moving lead-out seat during the linear movement of the moving contact.

[0032] Furthermore, a stepped countersunk hole is provided in the axial direction of the moving contact, and a stepped surface fixedly connected to a driving connecting rod of the moving contact driving mechanism is provided in the stepped countersunk hole.

[0033] Beneficial effect: By setting a stepped countersunk hole in the moving contact, part of the transmission parts of the driving mechanism can be placed inside it, saving the transmission connection space. On the other hand, due to the setting of the stepped countersunk hole, the weight of the moving contact is also reduced, and accordingly, the material cost is also reduced.

[0034] Furthermore, the moving contact driving mechanism includes a driving connecting rod, a connecting rod, a double crutch arm and an insulating pull rod connected in sequence, one end of the connecting rod is connected to the driving connecting rod, and the other end of the connecting rod is connected to the double crutch arm. One of the double crutch arms drives the moving contact to move linearly through the connecting rod and the driving connecting rod, and the other serves as an input section to transmit the motion through the insulating pull rod.

[0035] Beneficial effects: The transmission structure is simplified and the transmission efficiency is improved.

[0036] Furthermore, the driving connecting rod and the connecting rod of the moving contact driving mechanism are located in the stepped counterbore, and one end of the driving connecting rod is fixedly connected to the stepped surface through a flange.

[0037] Beneficial effect: some transmission parts of the driving mechanism are placed inside it, saving transmission connection space.

[0038] Furthermore, a supporting sleeve is provided at the lower end of the corresponding movable outlet seat, and the insulating pull rod is located inside the supporting sleeve.

[0039] Beneficial effects: The transmission structure is simple and convenient for driving the connecting rod and supporting the movable outlet seat.

[0040] Furthermore, the static outlet seat and the dynamic outlet seat are fixedly connected via an insulating support rod, and the insulating support rod is arranged along the peripheral side of the vacuum arc extinguishing chamber.

[0041] Beneficial effect: The effective support between the static outlet seat and the dynamic outlet seat is improved, and the stability of the horizontal arrangement of the vacuum circuit breaker is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A cross-sectional view of a single-phase circuit breaker of the present invention; Figure 2 A partial cross-sectional view of an embodiment of a single-phase circuit breaker of the present invention; Figure 3 This is a structural diagram of a moving contact and a guide support structure of the present invention; Figure 4 This is a structural diagram of a portion of a moving contact extending out of a vacuum interrupter housing of the present invention; Figure 5 It is a front view of the end surface cavity of a moving contact of the present invention; Figure 6A schematic diagram of a first guide support structure of the present invention; Figure 7 A schematic diagram of a second guide support structure of the present invention; Figure 8 A structural diagram of a guide cylinder of the present invention; Fig. 9 A schematic structural diagram of a moving contact driving mechanism of the present invention; Fig.10 An overall view of an embodiment of a circuit breaker of the present invention; In the figure: 1. vacuum arc chamber; 2. moving contact; 21. cylindrical section; 22. electrical connection section; 23. gap; 24. fixing hole; 25. cavity countersunk hole; 26. mounting hole; 31. first guide support structure; 32. first guide sleeve; 4. guide cylinder; 51. second guide support structure; 52. second guide sleeve; 6. flexible connection; 7. moving outlet seat; 8. driving connecting rod; 9. connecting rod; 10. double crutch arm; 11. support seat; 12. insulating pull rod; 13. support sleeve; 14. heat dissipation hole; 15. mounting seat; 16. static outlet seat; 17. heat dissipation fin; 18. insulating support rod; 19. outlet seat support; 20. housing; 201. voltage transformer; 202. current transformer; 203. insulating support connecting rod; 204. base frame. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with embodiments.

[0044] The single-phase circuit breaker of the present invention is provided with an electrical connection section on the portion of the moving contact extending outside the housing of the vacuum interrupter. The electrical connection section is circumferentially provided with a plurality of wiring surfaces fixedly connected to the flexible connection. The moving contact is electrically connected to the moving contact wire seat through the flexible connection. Since the flexible connection has a certain elastic deformability, the moving contact can always maintain abutting contact with the moving lead seat during the movement of the moving contact and have a sufficient flow area, thereby ensuring that the moving contact of the vacuum circuit breaker is electrically connected to the moving lead seat stably during the movement and can adapt to the flow of large-capacity current.

[0045] Embodiment 1: See attached Figure 1-3 , which is the first embodiment of the present invention, provides a single-phase circuit breaker, which aims to solve the technical problems of unstable electrical connection between the moving contact and the moving outlet seat and difficulty in adapting to the flow capacity of large-capacity current caused by the unstable shaking of the moving contact during the linear movement of the moving contact in the prior art. The single-phase embodiment of the circuit breaker of the present invention is as follows: A static outlet seat 16 and a moving outlet seat 7 are respectively provided at both ends of the vacuum interrupter 1, and support sleeves 13 are respectively provided at the lower ends corresponding to the static outlet seat 16 and the moving outlet seat 7. The moving contact 2 includes a cylindrical section 21 that slides with the moving end of the vacuum interrupter 1 shell during the opening and closing movement, and an electrical connection section 22 arranged on the outer end face of the cylindrical section 21. The electrical connection section 22 is located outside the shell of the vacuum interrupter 1, and the electrical connection section 22 is provided with multiple wiring surfaces around the axis of the moving contact 2 in the circumferential direction. The multiple wiring surfaces of the electrical connection section 22 are all fixedly provided with soft connections 6. The moving contact 2 is in contact with the moving outlet seat 7 through the soft connection 6 to achieve electrical connection. The soft connection 6 and the wiring surface of the electrical connection section 22 are arranged one by one, and the moving outlet seat 7 has an activity space for the soft connection 6 to move with the moving contact 2. The present invention improves the structure of the moving contact, and arranges the moving contact to include an electrical connection section located outside the arc extinguishing chamber housing, and a plurality of wiring surfaces are arranged around the axis of the moving contact in the circumferential direction of the electrical connection section, and a soft connection is fixedly arranged on the plurality of wiring surfaces of the electrical connection section, and the moving contact is electrically connected to the moving lead-out socket through the soft connection, and the soft connection is arranged in a one-to-one correspondence with the wiring surface of the electrical connection section. Since the soft connection has a certain elasticity, it can always maintain abutting contact with the moving lead-out socket with sufficient flow area during the movement of the moving contact as the moving contact moves, and therefore, can solve the technical problems of unstable electrical connection between the moving contact and the moving lead-out socket and difficulty in adapting to the flow capacity of large-capacity current caused by unstable shaking of the moving contact during the linear sliding of the moving contact of the vacuum circuit breaker.

[0046] Further, the flexible connection 6 is an annular flexible connection, which has an internal cavity, and is fixedly connected to the wiring surface of the electrical connection section 22 by a connecting piece, and a fixing hole for the annular flexible connection is provided on the wiring surface of the electrical connection section 22, and the connecting piece can be a screw or a plug, etc. The top surface of the annular flexible connection abuts against the movable outlet seat 7 during the sliding process, and the top surface of the annular flexible connection also has a fine gap. The elastic deformation adaptability of the flexible connection can be further improved by the annular flexible connection with an internal cavity, and the electrical connection effect between the electrical connection section and the movable outlet seat during the movement of the moving contact can be better guaranteed.

[0047] Furthermore, if Figure 4 As shown, multiple connection surfaces of the electrical connection section 22 are provided with slits 23, and the multiple connection surfaces are all cut by the slits 23. The slits 23 are preferably arranged at the central position of the connection surface of the electrical connection section 22. The arrangement of the slits can reduce the occurrence of eddy currents.

[0048] Furthermore, if Figure 4 As shown, the electrical connection section 22 is preferably a regular polyhedral column section, and the multiple wiring surfaces of the electrical connection section 22 are all planes.

[0049] Furthermore, if Figure 3 and 8 As shown, the outer end surface of the electrical connection section 22 is fixedly connected with a guide cylinder 4, and the outer end surface of the electrical connection section 22 is provided with a fixing hole 24 for fixing and installing the guide cylinder 4. The guide support structure includes a first guide support structure 31 and a second guide support structure 51 that are coaxially and spaced apart and fixed on the movable outlet seat 7. The first guide support structure 31 and the second guide support structure 51 both have a central axis hole. The first guide support structure 31 is matched with the outer circumference of the cylindrical section 21, and the second guide support structure 51 is matched with the outer circumference of the guide cylinder 4. Two guide support structures that are spaced apart and coaxially fixed on the movable outlet seat are provided. The two guide support structures respectively have a central axis hole. Through the central axis hole, the two guide support structures can be guided and matched on the cylindrical section and the guide cylinder of the movable contact respectively. The guide cylinder can be regarded as an extended section of the movable contact. The setting of the guide cylinder can ensure that the two guide support structures have a certain span. While ensuring the coaxiality of the two guide support structures, it can also provide reliable support when the movable contact is horizontally guided and slid, thereby ensuring the smooth linear movement of the movable contact.

[0050] Furthermore, the guide cylinder 4 is a guide aluminum cylinder. Since the density and price of aluminum are lower than copper, the use of an aluminum cylinder reduces the weight of the moving contact on the one hand and reduces the material cost on the other hand. At the same time, the guide cylinder 4 is hollow inside, and one end of the guide cylinder 4 has a mounting seat 15. The mounting seat 15 is evenly provided with threaded holes in the circumferential direction. The guide cylinder 4 can be fixed on the outer end surface of the electrical connection section 22 through the threaded holes.

[0051] Furthermore, if Figure 6 and 7 As shown, a plurality of heat dissipation holes 41 are provided on the first guide support structure 31 and the second guide support structure 51 in the circumferential direction around the central axis hole. The heat dissipation holes 14 can be various shapes such as circular and elliptical. Those skilled in the art can set them according to needs. The setting of the heat dissipation holes can further improve the flow heat dissipation inside the vacuum circuit breaker and increase the flow area.

[0052] Furthermore, the central axis hole is a stepped circular hole, in which a guide sleeve is installed. The first guide support structure 31 has a first guide sleeve 32, and the second guide support structure 51 has a second guide sleeve 52. The first guide support structure 31 is matched on the outer circumferential surface of the cylindrical section 21, and the second guide support structure 51 is matched on the guide cylinder 4. The guide support structure and the guide sleeve cooperate to support the sliding of the moving contact, and the appropriate tolerance size can be set to ensure smooth movement of the moving contact.

[0053] Furthermore, the first guide support structure 51 and the second guide support structure 52 are both plate-like structures, the first guide support structure 31 is annular, and bolt holes are evenly arranged in the circumferential direction at the edge of the first guide support structure 31, so as to fix the first guide support structure 31 on the moving outlet seat 7. The second guide support plate 51 has two vertical sides, and there is an installation space between the vertical sides and the inner wall of the vacuum circuit breaker housing, which can facilitate the disassembly and installation of the second guide support plate 51 in the vacuum circuit breaker.

[0054] Furthermore, the moving contact 2 is provided with a cavity countersink 25 along the axial direction of the moving end of the vacuum interrupter, and the cavity countersink 25 is a stepped countersink, and the stepped countersink has a stepped surface fixedly connected to the driving connecting rod 8 of the driving mechanism through a flange, and the driving mechanism is used to drive the moving contact 2 to move linearly. By providing the stepped countersink in the moving contact, part of the transmission parts of the driving mechanism can be placed inside it, saving the transmission connection space. On the other hand, due to the provision of the stepped countersink, the weight of the moving contact is also reduced, and accordingly, the material cost is also reduced.

[0055] Furthermore, the driving mechanism comprises a driving connecting rod 8, a connecting rod 9, a double-crank arm 10 and an insulating pull rod 12 connected in sequence, and the end of the driving connecting rod 8 can be fixed on the stepped surface by a flange, such as Figure 5 As shown, a mounting hole 26 is provided on the stepped surface, and a mounting flange can be installed by passing a bolt through the mounting hole 26. One end of the connecting rod 9 is connected to the other end of the driving connecting rod 8, and the other end of the connecting rod 9 is connected to the double-crank arm 10. A support seat 11 is provided on the second guide support structure 51, and the support seat 11 has a pin shaft hole. The double-crank arm 10 rotates around the pin shaft at the pin shaft hole on the support seat 11. One of the double-crank arms 10 drives the moving contact 2 to make a linear motion through the connecting rod 9 and the driving connecting rod 8, and the other serves as an input section to transmit the motion through the insulating pull rod 12. Through the arrangement of the above-mentioned drive structure, the transmission structure is simplified and the transmission efficiency is improved. In addition to installing the double-crank arm 10 on the support seat 11, a support member for installing and fixing the double-crank arm 10 can also be separately set in the single-phase of the circuit breaker.

[0056] Furthermore, if Figure 1 and 9As shown, a heat dissipation fin 17 is also provided on the single-phase housing of the circuit breaker, and the static outlet seat 16 and the dynamic outlet seat 7 are fixedly connected by an insulating support rod 18, and the insulating support rod 18 is arranged along the circumference of the vacuum arc chamber 1. The lower ends of the static outlet seat 16 and the dynamic outlet seat 7 are both provided with a support sleeve 13, and the upper end of the support sleeve 13 is provided with an outlet seat support 19, and the outlet seat support 19 is used to support the static outlet seat 16 and the dynamic outlet seat 7 respectively. The insulating pull rod 12 is located in the support sleeve 13, and the insulating pull rod 12 transmits the movement. One end of the insulating pull rod 12 is connected to one of the crank arms of the double crank arm 10, which is used to drive the double crank arm 10 to rotate and swing to drive the connecting rod 9 and the driving connecting rod 8 to move, thereby driving the moving contact 2 to slide horizontally.

[0057] Embodiment 2: A second embodiment of the present invention provides a circuit breaker, wherein the circuit breaker includes the single-phase circuit breaker in the above-mentioned embodiment 1.

[0058] Furthermore, as attached Fig.10 As shown, the circuit breaker has a square housing 20, a base frame 204 is arranged at the bottom of the housing 20, a voltage transformer 201 is installed on the inner wall of the housing 20, a current transformer 202 is arranged on a side wall along the axial direction of the vacuum interrupter 1, and insulating support connecting rods 203 are also arranged on the housings of the static outlet seat 16 and the dynamic outlet seat 7, respectively. The other end of the insulating support connecting rod 203 is fixed to the support in the circuit breaker, and is used to support the static outlet seat 16 and the dynamic outlet seat 7.

[0059] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A single-phase circuit breaker, comprising a vacuum interrupter, a static outlet seat and a moving outlet seat are respectively fixed at both ends of the housing of the vacuum interrupter, and a moving contact is arranged in the housing, characterized in that: The moving contact includes an electrical connection section located outside the arc extinguishing chamber housing, and a plurality of wiring surfaces are provided in the circumferential direction of the electrical connection section around the axis of the moving contact. Soft connections are fixedly provided on the plurality of wiring surfaces of the electrical connection section, and the moving contact abuts against the moving lead-out seat through the soft connection to achieve electrical connection. The soft connection is arranged in one-to-one correspondence with the wiring surface of the electrical connection section, and the moving lead-out seat has a movable space inside for the soft connection to move with the moving contact.

2. A single-phase circuit breaker according to claim 1, characterized in that: The flexible connection is an annular flexible connection having an internal cavity, and is fixedly connected to the wiring surface of the electrical connection section through a connecting piece, and the top surface of the annular flexible connection abuts against the movable outlet seat.

3. A single-phase circuit breaker according to claim 1 or 2, characterized in that: Gaps for reducing eddy currents are provided on multiple wiring surfaces of the electrical connection section.

4. A single-phase circuit breaker according to claim 1 or 2, characterized in that: The electrical connection section is a regular polyhedral column section.

5. A single-phase circuit breaker according to claim 1, characterized in that: A stepped countersunk hole is provided in the axial direction of the moving contact, and a stepped surface fixedly connected to a driving connecting rod of the moving contact driving mechanism is provided in the stepped countersunk hole.

6. A single-phase circuit breaker according to claim 5, characterized in that: The moving contact driving mechanism includes a driving connecting rod, a connecting rod, a double crutch arm and an insulating pull rod connected in sequence, one end of the connecting rod is connected to the driving connecting rod, and the other end of the connecting rod is connected to the double crutch arm. One of the double crutch arms drives the moving contact to move linearly through the connecting rod and the driving connecting rod, and the other double crutch arm serves as an input section to transmit the motion through the insulating pull rod.

7. A single-phase circuit breaker according to claim 6, characterized in that: The driving connecting rod and the connecting rod of the moving contact driving mechanism are located in the stepped countersunk hole, and one end of the driving connecting rod is fixedly connected to the stepped surface through a flange.

8. A single-phase circuit breaker according to claim 7, characterized in that: A supporting sleeve is arranged corresponding to the lower end of the movable outlet seat, and the insulating pull rod is located inside the supporting sleeve.

9. A single-phase circuit breaker according to claim 1, characterized in that: The static outlet seat and the dynamic outlet seat are fixedly connected by an insulating support rod, and the insulating support rod is arranged along the peripheral side of the vacuum arc extinguishing chamber.

10. A circuit breaker, characterized in that: A single-phase circuit breaker comprising any one of claims 1-9.

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