Circuit breaker single phase and circuit breaker

Abstract

The invention provides a circuit breaker single phase and a circuit breaker, is applied to the technical field of medium-voltage complete electric appliances, and aims at a high-capacity horizontal vacuum circuit breaker, and in order to guarantee smooth movement of a moving contact, the moving contact in the circuit breaker single phase is provided with a cylindrical section which is in sliding fit with the end part of a moving end of a shell of a vacuum arc-extinguishing chamber in switching-on and switching-off movement; the first guide supporting structure fixedly connected with the movable wire outlet seat is matched on the cylindrical section, so that the part, extending out of the vacuum arc-extinguishing chamber shell, of the movable contact can be guided and supported; therefore, the technical problem that the moving contact of the existing large-capacity horizontal vacuum circuit breaker is not smooth in movement due to the lack of effective support in the opening and closing movement process is solved.

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, SF6 products are currently mostly used. When SF6 circuit breakers are breaking rated current and low current, arc contact erosion is relatively serious and not environmentally friendly. Regular replacement and maintenance are required, and the product price and maintenance costs of SF6 circuit breakers are expensive. Vacuum circuit breakers can solve the inherent shortcomings of SF6 circuit breakers. The operation and maintenance cycle of vacuum circuit breakers is longer than that of SF6 circuit breakers, which can greatly reduce the purchase and operation and maintenance costs of related equipment. However, the current carrying capacity of vacuum generator circuit breakers is currently limited by the contact diameter. Therefore, in order to increase the rated current carrying capacity of vacuum circuit breakers and meet the breaking capacity, the contact volume and mass of the vacuum interrupter need to be increased.

[0003] The vacuum interrupter of a large-capacity generator circuit breaker usually adopts a horizontal structure, that is, the moving contact is placed horizontally along the axial direction. For example, a Chinese invention patent application with application publication number CN101710545A, entitled "A Horizontal Vacuum Circuit Breaker for a High-Voltage AC Generator", adopts a horizontal vacuum circuit breaker, including a steel frame, and three-phase horizontal switching devices fixed in parallel on the steel frame. Each single-phase horizontal switching device includes a moving end support insulator and a static end support insulator fixed on the steel frame. A vacuum interrupter is arranged between the moving end aluminum bracket and the static end aluminum bracket. The moving end of the vacuum interrupter includes 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, the moving contact is located inside the vacuum interrupter. Since the moving contact is placed horizontally along the axial direction, when the mass of the moving contact is large, the moving contact in the single-phase circuit breaker will tilt downward due to gravity. The above situation will cause the moving contact to lack effective support and move unsmoothly during the opening and closing movement. Summary of the invention

[0005] The purpose of the present invention is to provide a single-phase circuit breaker to solve the technical problem that the moving contact of the current large-capacity horizontal vacuum circuit breaker lacks effective support during the opening and closing movement, resulting in its unsmooth movement. 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 includes a horizontal vacuum arc chamber, the vacuum arc chamber includes a shell and a moving contact arranged in the shell, the end of the shell corresponding to the moving contact is the moving end of the arc chamber, the moving end of the arc chamber is fixedly connected to a moving lead-out seat, the moving contact has a cylindrical section that slides with the end of the moving end of the vacuum arc chamber shell during opening and closing movements, a first guide support structure is fixed on the moving lead-out seat, and the cylindrical section guides and cooperates with the first guide support structure.

[0007] Beneficial effects: The single-phase circuit breaker of the present invention is an improved invention. For large-capacity horizontal vacuum circuit breakers, in order to ensure the smooth movement of the moving contact, the moving contact in the single-phase circuit breaker of the present invention has a cylindrical section that slides with the moving end of the vacuum arc chamber housing during the opening and closing movement. By guiding the cylindrical section with a first guide support structure fixedly connected to the moving outlet seat, the part of the moving contact extending out of the vacuum arc chamber housing can be guided and supported, thereby solving the technical problem that the moving contact of the current large-capacity horizontal vacuum circuit breaker lacks effective support during the opening and closing movement, resulting in its unsmooth movement.

[0008] Furthermore, the moving contact also includes an electrical connection section fixedly arranged at the outer end of the cylindrical section, the moving contact is electrically connected to the moving lead-out socket via the electrical connection section, a guide cylinder is provided on the outer end face of the electrical connection section, the electrical connection section is located between the cylindrical section and the guide cylinder, a second guide support structure is fixed on the moving lead-out socket, and the guide cylinder cooperates with the second guide support structure for guiding.

[0009] Beneficial effect: The guide cylinder can be regarded as an extended section of the moving contact. The cylindrical section and the guide cylinder are coaxially guided to cooperate with the first guide support structure and the second guide support structure respectively. By coaxially arranging two guide support structures at the moving end of the vacuum arc extinguishing chamber, it can be ensured 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 moving contact is horizontally guided and slides, thereby ensuring smooth linear movement of the moving contact.

[0010] Furthermore, the first guide support structure and the second guide support structure both have a central axis hole, the first guide support structure is matched on the outer circumferential surface of the cylindrical segment, and the second guide support structure is matched on the outer circumferential surface of the guide cylinder.

[0011] Beneficial effect: The adaptability of the first guide support structure and the second guide support structure to the moving contact cylindrical section and the guide cylinder is improved, and the coaxiality is ensured.

[0012] Furthermore, the central axis hole is a stepped circular hole, and a guide sleeve is installed in the stepped circular hole.

[0013] Beneficial effect: The guide support structure and the guide sleeve cooperate to support the moving contact to slide, and the appropriate tolerance size can be set to ensure smooth movement of the moving contact.

[0014] Furthermore, the electrical connection section is provided with a plurality of wiring surfaces in the circumferential direction around the axis of the moving contact, and a flexible connection is fixedly provided on the plurality of wiring surfaces. The flexible connection is arranged in a one-to-one correspondence with the wiring surface of the electrical connection section, and the moving contact is electrically connected to the moving lead-out socket through the flexible connection on the electrical connection section.

[0015] Beneficial effect: Since the soft connection has a certain elasticity, it can always maintain contact with the moving lead-out seat during the movement of the moving contact with sufficient flow area, further ensuring the stability of the electrical connection between the moving contact and the moving lead-out seat, and improving the flow capacity to adapt to large-capacity currents.

[0016] 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 through a connecting piece.

[0017] 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.

[0018] Furthermore, a stepped countersunk hole is provided in the axial direction of the moving contact, and a stepped surface fixedly connected to the moving contact driving connecting rod is provided in the stepped countersunk hole.

[0019] 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.

[0020] Furthermore, gaps are provided on the multiple wiring surfaces of the electrical connection section.

[0021] Beneficial effect: The setting of the gap on the wiring surface of the electrical connection section reduces the generation of eddy current.

[0022] Furthermore, the first guide support structure and the second guide support structure are both annular plates, and a plurality of heat dissipation holes are arranged on the annular plates along the circumference of the central axis hole.

[0023] Beneficial effect: The provision of the heat dissipation holes can further improve the heat dissipation of the vacuum circuit breaker and increase the flow area.

[0024] A technical solution of a circuit breaker of the present invention is: A circuit breaker includes a single-phase circuit breaker, wherein the single-phase circuit breaker includes a horizontal vacuum arc chamber, wherein the vacuum arc chamber includes a shell and a moving contact arranged in the shell, wherein one end of the shell corresponding to the moving contact is the moving end of the arc chamber, wherein the moving end of the arc chamber is fixedly connected to a moving lead-out seat, wherein the moving contact has a cylindrical section that slidably cooperates with the end of the moving end of the vacuum arc chamber shell during opening and closing movements, wherein a first guide support structure is fixed on the moving lead-out seat, and wherein the cylindrical section guides and cooperates with the first guide support structure.

[0025] Beneficial effects: The circuit breaker of the present invention is an improved invention. For large-capacity horizontal vacuum circuit breakers, in order to ensure the smooth movement of the moving contact, the moving contact in the single-phase circuit breaker of the present invention has a cylindrical section that slides with the moving end of the vacuum arc chamber housing during the opening and closing movement. By guiding the cylindrical section with a first guide support structure fixedly connected to the moving outlet seat, the part of the moving contact extending out of the vacuum arc chamber housing can be guided and supported, thereby solving the technical problem that the moving contact of the current large-capacity horizontal vacuum circuit breaker lacks effective support during the opening and closing movement, resulting in its unsmooth movement.

[0026] Furthermore, the moving contact also includes an electrical connection section fixedly arranged at the outer end of the cylindrical section, the moving contact is electrically connected to the moving lead-out socket via the electrical connection section, a guide cylinder is provided on the outer end face of the electrical connection section, the electrical connection section is located between the cylindrical section and the guide cylinder, a second guide support structure is fixed on the moving lead-out socket, and the guide cylinder cooperates with the second guide support structure for guiding.

[0027] Beneficial effect: The guide cylinder can be regarded as an extended section of the moving contact. The cylindrical section and the guide cylinder are coaxially matched with the first guide support structure and the second guide support structure respectively. By coaxially arranging two guide support structures at intervals at the moving end of the vacuum arc extinguishing chamber, it can be ensured 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 moving contact is horizontally guided and slides, thereby ensuring smooth linear movement of the moving contact.

[0028] Furthermore, the first guide support structure and the second guide support structure both have a central axis hole, the first guide support structure is matched on the outer circumferential surface of the cylindrical segment, and the second guide support structure is matched on the outer circumferential surface of the guide cylinder.

[0029] Beneficial effect: The adaptability of the first guide support structure and the second guide support structure to the moving contact cylindrical section and the guide cylinder is improved, and the coaxiality is ensured.

[0030] Furthermore, the central axis hole is a stepped circular hole, and a guide sleeve is installed in the stepped circular hole.

[0031] Beneficial effect: The guide support structure and the guide sleeve cooperate to support the moving contact to slide, and the appropriate tolerance size can be set to ensure smooth movement of the moving contact.

[0032] Furthermore, the electrical connection section is provided with a plurality of wiring surfaces in the circumferential direction around the axis of the moving contact, and a flexible connection is fixedly provided on the plurality of wiring surfaces. The flexible connection is arranged in a one-to-one correspondence with the wiring surface of the electrical connection section, and the moving contact is electrically connected to the moving lead-out socket through the flexible connection on the electrical connection section.

[0033] Beneficial effect: Since the soft connection has a certain elasticity, it can always maintain sufficient flow area with the moving lead seat during the movement of the moving contact, further ensuring the stability of the electrical connection between the moving contact and the moving lead seat, and improving the flow capacity to adapt to large-capacity currents.

[0034] Furthermore, the flexible connection is an annular flexible connection having an internal cavity, and the inner bottom surface of the internal cavity is used to fix the annular flexible connection to the wiring surface through a connecting piece.

[0035] 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.

[0036] Furthermore, a stepped countersunk hole is provided in the axial direction of the moving contact, and a stepped surface fixedly connected to the moving contact driving connecting rod is provided in the stepped countersunk hole.

[0037] 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.

[0038] Furthermore, gaps are provided on the multiple wiring surfaces of the electrical connection section.

[0039] Beneficial effect: The setting of the gap on the wiring surface of the electrical connection section reduces the generation of eddy current.

[0040] Furthermore, the first guide support structure and the second guide support structure are both annular plates, and a plurality of heat dissipation holes are arranged on the annular plates along the circumference of the central axis hole.

[0041] Beneficial effect: The provision of the heat dissipation holes can further improve the heat dissipation of the vacuum circuit breaker and increase the flow area. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A partial cross-sectional view of an embodiment of a single-phase circuit breaker of the present invention; Figure 2 This is a structural diagram of a moving contact and a guide support structure of the present invention; Figure 3 This is a structural diagram of a portion of a moving contact extending out of a vacuum interrupter housing of the present invention; Figure 4 It is a front view of the end surface cavity of a moving contact of the present invention; Figure 5 A schematic diagram of a first guide support structure of the present invention; Figure 6 A schematic diagram of a second guide support structure of the present invention; Figure 7 A structural diagram of a guide cylinder of the present invention; Figure 8 A schematic structural diagram of a moving contact driving mechanism 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. 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 can prevent the "head-diving" phenomenon from occurring during operation by arranging an auxiliary guide support device for the moving contact at the moving end of the arc extinguishing chamber, thereby ensuring the normal operation of the large horizontal vacuum circuit breaker.

[0045] Embodiment 1: The first embodiment of the present invention provides a single-phase circuit breaker, which aims to solve the technical problem of the unsmooth movement of the moving contact due to the unstable tilting and shaking of the moving contact during the linear sliding process of the moving contact in the large-capacity horizontal vacuum circuit breaker in the prior art. The embodiments of the moving contact of the present invention are as follows: The moving contact 2 has a cylindrical section 21 that slides with the moving end of the vacuum interrupter 1 housing during the opening and closing movement. The end of the vacuum interrupter 1 housing corresponding to the moving contact 2 is the moving end of the interrupter. The moving end of the interrupter is fixedly connected to a moving outlet seat 7. The cylindrical section 21 is guided with a first guide support structure 31. The first guide support structure 31 is fixedly connected to the moving outlet seat 7 connected to the moving end of the vacuum interrupter 1. See the attached Figure 1-3. For large-capacity horizontal vacuum circuit breakers, in order to ensure smooth movement of the moving contact, the moving contact in the single-phase circuit breaker of the present invention has a cylindrical section that slides with the moving end of the vacuum arc chamber housing during the opening and closing movement. By matching the cylindrical section with a first guide support structure fixedly connected to the moving lead-out seat, a guide support can be provided for the portion of the moving contact extending out of the vacuum arc chamber housing, thereby solving the technical problem that the moving contact of the current large-capacity horizontal vacuum circuit breaker lacks effective support during the opening and closing movement, resulting in its unsmooth movement.

[0046] Furthermore, the moving contact 2 also includes an electrical connection section 22 fixedly mounted on the outer end of the cylindrical section 21, a guide cylinder 4 is fixedly connected to the outer end surface of the electrical connection section 22, a fixing hole 24 for fixing the guide cylinder 4 is provided on the outer end surface of the electrical connection section 22, the electrical connection section 22 is located between the cylindrical section 21 and the guide cylinder 4, a second guide support structure 51 is matched on the guide cylinder 4, and the second guide support structure 51 is fixed on the moving outlet seat 7. The guide cylinder can be regarded as an extended section of the moving contact, and the cylindrical section and the guide cylinder are respectively coaxially guided with a first guide support structure and a second guide support structure. By coaxially arranging two guide support structures at intervals at the moving end of the vacuum arc extinguishing chamber, it can be ensured that the two guide support structures have a certain span, and while ensuring the coaxiality of the two guide support structures, reliable support can be provided when the moving contact is horizontally guided and slid, thereby ensuring smooth linear movement of the moving contact.

[0047] Furthermore, as attached Figure 2 As shown, 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 on the outer circumference of the cylindrical segment 21, and the second guide support structure 51 is matched on the outer circumference of the guide cylinder 4. The setting of the central axis hole improves the adaptability of the first guide support structure and the second guide support structure to the moving contact cylindrical segment and the guide cylinder, and ensures the coaxiality.

[0048] Furthermore, as attached Figure 3-7 As shown, the central axis hole is a stepped circular hole, and a guide sleeve is installed in the stepped circular hole. 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.

[0049] Furthermore, the electrical connection section 22 is provided with a plurality of wiring surfaces around the axis of the moving contact 2 in the circumferential direction, and the plurality of wiring surfaces are fixedly provided with a soft connection 6, and the soft connection 6 is arranged one-to-one with the wiring surface of the electrical connection section 22, and the moving contact 2 is electrically connected to the moving outlet seat 7 through the soft connection 6, and the moving outlet seat 7 has an activity space inside to avoid the soft connection 6 from moving with the moving contact 2, and the activity space is formed between the first guide support structure 31 and the second guide support structure 51 in the present invention. Since the soft connection has a certain elasticity, it can always maintain a sufficient flow area with the moving outlet seat during the movement of the moving contact, further ensuring the stability of the electrical connection between the moving contact and the moving outlet seat, and improving the flow capacity to adapt to large-capacity currents.

[0050] 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 the top surface of the annular flexible connection is in sliding contact with the movable outlet seat 7, 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, a bolt or a latch, etc. 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 movable outlet seat during the movement of the moving contact.

[0051] Furthermore, 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. The provision of the regular polyhedral column section improves the electrical connection effect between the moving contact and the moving lead-out seat during the linear motion of the moving contact.

[0052] Furthermore, as attached Figure 3 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. By setting the slits, the occurrence of eddy currents can be reduced.

[0053] Furthermore, the moving contact 2 is provided with a cavity countersink 25 along the axial direction of the moving end of the arc extinguishing chamber, 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, and the driving connecting rod 8 is used to drive the moving contact 2 to move linearly. By providing the cavity 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 cavity countersink, the weight of the moving contact is also reduced, and accordingly, the material cost is also reduced.

[0054] Furthermore, the driving mechanism includes a driving connecting rod 8, a connecting rod 9, a double-crank arm 10 and an insulating pull rod 12. The end of the driving connecting rod 8 can be fixedly connected to the step surface through a flange. A mounting hole 26 is provided on the step surface, and the flange can be installed by inserting a bolt into the mounting hole 26. One end of the connecting rod 9 is connected to 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. The support seat 11 has a pin hole. The double-crank arm 10 rotates around the pin at the pin 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 driving structure, the transmission structure is simplified and the transmission efficiency is improved.

[0055] Furthermore, as attached Figure 7 As shown, 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.

[0056] Furthermore, a plurality of heat dissipation holes 14 are provided on the first guide support structure 31 and the second guide support structure 51 in a circumferential direction around the central axis hole. The heat dissipation holes 14 may be in various shapes such as circular and elliptical. Those skilled in the art may set them according to needs. The setting of the heat dissipation holes may further improve the heat dissipation of the flow inside the vacuum circuit breaker and increase the flow area.

[0057] Furthermore, as attached Figure 5-6 As shown, the first guide support structure 51 and the second guide support structure 52 are both plate-shaped structures, the first guide support structure 31 is annular, and bolt holes are evenly arranged on the edge of the first guide support structure 31 in the circumferential direction, 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 removal and installation of the second guide support plate 51 in the vacuum circuit breaker.

[0058] 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.

[0059] Furthermore, as attached Figure 8As shown, a support sleeve 13 is provided at the lower end of the movable outlet seat 7, and an insulating pull rod 12 is located in the support sleeve 13. The support sleeve 13 is connected to the movable outlet seat 7, and the insulating pull rod 12 transmits 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.

[0060] 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 horizontal vacuum interrupter, the vacuum interrupter comprising a housing and a moving contact arranged in the housing, one end of the housing corresponding to the moving contact being the moving end of the interrupter, the moving end of the interrupter being fixedly connected to a moving outlet seat, characterized in that: The moving contact has a cylindrical section that slides with the moving end of the vacuum arc chamber housing during the opening and closing movement. A first guide support structure is fixed on the moving outlet seat, and the cylindrical section guides and cooperates with the first guide support structure.

2. A single-phase circuit breaker according to claim 1, characterized in that: The moving contact also includes an electrical connection section fixedly arranged at the outer end of the cylindrical section, the moving contact is electrically connected to the moving lead-out socket via the electrical connection section, a guide cylinder is provided on the outer end face of the electrical connection section, the electrical connection section is located between the cylindrical section and the guide cylinder, a second guide support structure is fixed on the moving lead-out socket, and the guide cylinder cooperates with the second guide support structure for guiding.

3. A single-phase circuit breaker according to claim 2, characterized in that: The first guide support structure and the second guide support structure both have a central axis hole. The first guide support structure is matched on the outer circumferential surface of the cylindrical segment, and the second guide support structure is matched on the outer circumferential surface of the guide cylinder.

4. A single-phase circuit breaker according to claim 3, characterized in that: The central axis hole is a stepped circular hole, and a guide sleeve is installed in the stepped circular hole.

5. A single-phase circuit breaker according to claim 2, characterized in that: The electrical connection section is provided with a plurality of wiring surfaces in the circumferential direction around the axis of the moving contact, and soft connections are fixedly provided on the plurality of wiring surfaces. The soft connections are arranged in one-to-one correspondence with the wiring surfaces of the electrical connection section, and the moving contact is electrically connected to the moving outlet seat through the soft connections on the electrical connection section.

6. A single-phase circuit breaker according to claim 5, characterized in that: The flexible connection is an annular flexible connection having an internal cavity, and the annular flexible connection is fixedly connected to the wiring surface through a connecting piece.

7. A single-phase circuit breaker according to claim 2, characterized in that: A stepped countersunk hole is provided in the axial direction of the moving contact, and a stepped surface fixedly connected to the moving contact driving connecting rod is provided in the stepped countersunk hole.

8. A single-phase circuit breaker according to claim 5, characterized in that: Gaps for reducing eddy currents are provided on a plurality of connection surfaces of the electrical connection section.

9. A single-phase circuit breaker according to claim 3, characterized in that: The first guide support structure and the second guide support structure are both annular plates, and a plurality of heat dissipation holes are arranged on the annular plates around the central axis hole.

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

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