An indoor SF6 circuit breaker

Abstract

An indoor SF6 circuit breaker includes a chassis, a support frame mounted on the chassis, and several fixed-seal poles mounted on the support frame. A sleeve is inserted into each fixed-seal pole. A connecting bolt connected to the sleeve is provided on the support frame. The sleeve includes a left half-seal and a right half-seal. One mating end of the left and right half-seals is a pivot end, allowing the sleeve to be opened or closed by swinging the left or right half-seal via a pin. The other mating end of the left and right half-seals is a locking end, preventing either the left or right half-seal from swinging when the sleeve is closed. The lower end of the plug-in is also provided with a retaining element to prevent the plug-in from disengaging from the mating end in a direction opposite to the insertion direction. The advantages of this invention are that having one pivot end and a locking end for the sleeve simplifies the process of fitting it into the fixed-seal pole, and the plug-in used to keep the sleeve closed also ensures its insertion stability through the assembly retaining element.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to an indoor SF6 circuit breaker. Background Technology

[0002] Indoor SF6 circuit breakers are high-voltage switchgear specifically designed and manufactured for indoor environments. They utilize sulfur hexafluoride (SF6) gas as an insulating and arc-extinguishing medium to connect and disconnect circuits during normal operation of the power system, and to quickly and reliably interrupt fault currents in the event of faults such as short circuits or overloads. They are key equipment for ensuring the safe and stable operation of modern power grids.

[0003] Publication (Announcement) No.: CN222281847U discloses an indoor high-voltage vacuum circuit breaker, including a chassis, a support frame mounted on the chassis, and a solid-sealed pole mounted on the support frame; a connector is provided between the solid-sealed pole and the support frame, and a connecting post is provided at the bottom of the solid-sealed pole, and the connecting post passes through the support frame and is connected to a first fastener; the connector includes a first clamping plate sleeved on one side of the solid-sealed pole, and the first clamping plate is connected to a second clamping plate provided on the other side of the solid-sealed pole; the first clamping plate is connected to a connecting seat provided on the support frame through the second fastener. To address the swaying issue that occurs during the pulling and retraction of the solid-sealed pole in this type of indoor circuit breaker, a connector is used to fix the solid-sealed pole, thereby unifying the upper and lower structures of the pole. However, this method has a drawback: the connector consists of two clamping plates, and both ends of the plates are secured with pins to prevent detachment after assembly. While this method can maintain the assembly of the two clamping plates, there is no anti-detachment structure between the pins and the clamping plates. In other words, the insertion state of the pins into the two clamping plates is not maintained, and they are prone to detachment under the influence of external factors (such as vibrations caused by wind). If they detach, the two clamping plates will no longer be able to maintain their assembled state. Utility Model Content

[0004] This invention aims to overcome the shortcomings of the prior art by providing an indoor SF6 circuit breaker to solve the aforementioned problems.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: This indoor SF6 circuit breaker includes a chassis, a support frame mounted on the chassis, and several fixed-seal poles mounted on the support frame. A sleeve is inserted into the fixed-seal pole. A connecting bolt connected to the sleeve is provided on the support frame. The sleeve includes a left half-seal and a right half-seal. One of the mating ends of the left half-seal and the right half-seal is a pivot end, so that the opening or closing of the sleeve is achieved by swinging the left half-seal or the right half-seal through a pin. The other mating end of the left half-seal and the right half-seal is a locking end, so that the left half-seal or the right half-seal cannot swing when the sleeve is closed by a plug. The lower end of the plug is also provided with a retaining member to prevent the plug from disengaging from the mating end in a direction opposite to the insertion direction.

[0006] Further improvements include notches at both ends of the left half-hoop and protrusions at both ends of the right half-hoop that insert into the notches. One protrusion is connected to the other end by a pin after being inserted into the notch, while the other protrusion is connected to the other end by a plug after being inserted into the notch.

[0007] Further improvements include a plug rod, a positioning block above the plug rod, and a connector below the plug rod. The plug rod is inserted into the sleeve after the protrusion is inserted into the recess. The positioning block is held at the upper end of the left half of the sleeve by the dimensional difference when the plug rod is inserted into the sleeve. The connector is exposed outside the lower part of the left half of the sleeve and assembled with the retainer to prevent the plug rod from coming out in a direction opposite to the insertion direction.

[0008] Further improvements include an insert post that engages with the retainer, an abutment block located at the lower end of the insert post, and a spring-back space formed by tapering part of the insert post. The spring-back space allows the retainer to spring back to its initial shape after being inserted into the connector and stretched open. After springing back to its initial shape, one end abuts against the lower end face of the left half-hoop, and the other end abuts against the upper end face of the abutment block.

[0009] Further improvements include the formation of a slot between the tapered portion of the inserted post and the abutment block, which allows the retaining element to be inserted into the slot in a circular arrangement.

[0010] Further improvements include setting the retainer as a sheet-like component, which is bent to form an insert portion and elastic portions symmetrically distributed on both sides of the insert portion. The insert portion uses its own through hole to pass through the abutment block and insert into the non-tapered part of the inserted post, and abuts against the lower end face of the left half hoop. The elastic portions are bent twice, so they can be inserted into the slot while being elastic, and abut against the upper end face of the abutment block.

[0011] Further improvements were made, with one end of the connecting bolt threaded into the support frame and the other end threaded into the left half hoop.

[0012] The beneficial effects of this utility model are: 1. The sleeve of this utility model has a shaft rotation end at one end and a locking end at the other end, which simplifies the process of fitting it into the solid seal pole. In addition, the plug-in used to keep the sleeve in a closed state can also avoid the plug-in from coming out in a direction away from its insertion direction due to external factors by assembling the retaining component. 2. The retainer of this utility model is an elastic component. After being stretched during the assembly process, it can automatically return to its initial shape. While returning to its initial shape, it can also achieve anti-detachment cooperation with the plug-in to ensure the assembly stability of the retainer and the insertion stability of the plug-in. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the clamp and connecting bolt of this utility model; Figure 3 This is a structural schematic diagram of the front of the sleeve of this utility model, used to show the retaining element and the insert; Figure 4 This utility model Figure 3 A magnified view of part A in the diagram. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings: Referring to the attached diagram: This indoor SF6 circuit breaker includes a chassis 1, a support frame 2 mounted on the chassis 1, and several fixed-seal poles 3 mounted on the support frame 2. A sleeve 4 is inserted into each fixed-seal pole 3. A connecting bolt 5 connected to the sleeve 4 is provided on the support frame 2. The sleeve 4 includes a left half-seal 41 and a right half-seal 42. One mating end of the left half-seal 41 and the right half-seal 42 is a pivot end, allowing the opening or closing of the sleeve 4 to be achieved by swinging the left half-seal 41 or the right half-seal 42 via a pin 6. The other mating end of the left half-seal 41 and the right half-seal 42 is a locking end, preventing either the left half-seal 41 or the right half-seal 42 from swinging when the sleeve 4 is closed via a plug 7. The lower end of the plug 7 is also provided with a retaining member 8 to prevent the plug 7 from disengaging from the mating end in a direction opposite to the insertion direction. The principle of this utility model is that the left half-hoop 41 and the right half-hoop 42 constituting the sleeve 4 can both swing through the pin 6. The swinging method means that the two do not need to be aligned and adjusted during assembly as in the prior art, whether they are closed or open. When the plug 7 is inserted into the left half-hoop 41 and the right half-hoop 42 at the same time, the two are in a closed state, so that the sleeve 4 is fully fitted onto the sealing pole 3 and can also generate clamping force. In this way, the sleeve 4 can be stably maintained in the position matching the position of the connecting bolt 5. The retaining member 8 is a detachable member. After cooperating with the plug 7, it can keep the plug 7 inserted into the left half-hoop 41 and the right half-hoop 42, so that the plug 7 has the ability to resist external factors and can prevent the plug 7 from being dislodged in a direction opposite to its insertion direction due to external factors. That is, it maintains the fitted state of the sleeve 4. Moreover, since one end is the shaft rotating end, the plug 7 and the retaining member 8 are only set on the other locking end, which is also more convenient in operation.

[0015] Both ends of the left half-hoop 41 have notches 411, and both ends of the right half-hoop 42 have protrusions 421 that insert into the notches 411. One end of the protrusion 421 is connected by a pin 6 after being inserted into the notch 411, and the other end of the protrusion 421 is connected by a plug 7 after being inserted into the notch 411. The fit between the notches 411 and the protrusions 421 allows the left half-hoop 41 and the right half-hoop 42 to partially overlap, so that whether the pin 6 or the plug 7 is used, it can be inserted into both the left half-hoop 41 and the right half-hoop 42 at the same time. The pin 6 is interference-fitted with the left half-hoop 41 and clearance-fitted with the protrusion 421 of the right half-hoop 42, so as not to affect the swing of the left half-hoop 41 or the right half-hoop 42. The plug 7 is clearance-fitted with the protrusions 421 of the left half-hoop 41 and the right half-hoop 42, so as not to affect the withdrawal of the plug 7 after insertion.

[0016] The insert 7 includes a rod 71, a positioning block 72 located above the rod 71, and a connector 73 located below the rod 71. The rod 71 is inserted into the sleeve 4 after the protrusion 421 is inserted into the recess 411. When the rod 71 is inserted into the sleeve 4, the positioning block 72 uses the size difference to keep it on the upper end face of the left half of the sleeve 41. The connector 73 is exposed below the left half of the sleeve 41 and is assembled with the retainer 8 to prevent the rod 71 from coming out in a direction opposite to the insertion direction. The rod 71 is used to simultaneously insert the protrusion 421 of the left half of the sleeve 41 and the right half of the sleeve 42 to ensure that the protrusion 421 of the locking end can be stably present in the recess 411. The positioning block 72 is used to prevent the rod 71 from coming out because the rod 71 is clearance-fitted with the left half of the sleeve 41 and the right half of the sleeve 42. The connector 73 is used to assemble with the retainer 8 so that the retainer 8 will not separate from the connector 73 without human operation.

[0017] The connector 73 has an insert post 731 that engages with the retainer 8, an abutment block 732 located at the lower end of the insert post 731, and a spring-back space 733 formed by tapering a portion of the insert post 731. The spring-back space 733 allows the retainer 8 to spring back to its initial shape after being inserted into the connector 73 and expanded. After springing back to its initial shape, one end abuts against the lower end face of the left half-hoop 41, and the other end abuts against the upper end face of the abutment block 732. The insert post 731 serves as the assembly part of the connector 73 for the retainer 8, and the two engage with each other. The tapering of the insert post 731 results in a tapered configuration of a portion of the insert post 731, which slims down the insert post 731, resulting in a dimensional difference between the tapered portion of the insert post 731 and the abutment block 732. After the retainer 8 is inserted into the inserted post 731, the abutment block 732 provides lower support for the retainer 8. That is, the distance between the upper end face of the abutment block 732 and the lower end face of the left half hoop 41 is adapted to the overall length of the retainer 8. When the retainer 8 is within this distance, it will abut against the lower end face of the left half hoop 41 and the upper end face of the abutment block 732. This can ensure the stability of the retainer 8 after it is inserted into the connector 73. Combined with the positioning block 72, it can also ensure the insertion stability of the plug 7. That is, the plug 7 will not float up or down when affected by external factors, so it will not affect the retainer 8. It can also provide a springback space 733. Because the retainer 8 will be stretched open by the abutment block 732 when it is inserted into the connector 73, the springback is used to achieve the abutment between the upper end face of the retainer 8 and the abutment block 732.

[0018] The tapered portion of the inserted post 731 and the abutment block 732 together form a slot 734 that allows the retainer 8 to be inserted into it and is arranged in a circle. The slot 734 allows the retainer 8 to also form a mating fit with the inserted post 731. Moreover, after insertion, a resistance is generated that prevents the mating fit from being released. This resistance will not disappear under non-human operation, which makes the stability of the retainer 8 inserted into the inserted post 731 better.

[0019] The retainer 8 is a sheet-like component, which is bent to form an insertion part 81 and elastic parts 82 symmetrically distributed on both sides of the insertion part 81. The insertion part 81, through its own through hole, passes through the abutment block 732 and is inserted into the non-tapered part of the inserted post 731, abutting against the lower end face of the left half-hoop 41. The elastic parts 82, through two bends, are both elastic and can be inserted into the slot 734, abutting against the upper end face of the abutment block 732. The insertion part 81 is used to engage with the inserted post 731. This allows the retainer 8 and connector 73 to be assembled together. The elastic part 82 is an anti-detachment structure. Its elasticity comes from its own bending. It is formed by bending twice. The bending point near the insertion part 81 is an arc-shaped bend, from which the elasticity comes. There is also a normal bend. The plug is formed by bending and inserted into the slot 734. It also has an abutment part that can abut against the abutment block 732. This allows the elastic part 82 to rebound after deformation and ensure its own assembly stability.

[0020] One end of the connecting bolt 5 is threaded into the support frame 2, and the other end is threaded into the left half-clamp 41. The thread can adjust the position of the connecting bolt 5. The connecting bolt 5 has two threaded connection sections. When one threaded connection section of the connecting bolt 5 is fully screwed into the left half-clamp 41, the other threaded connection section is not connected to the threaded hole on the support frame 2. Then, after adjusting the sleeve 4 to match the position of the threaded hole on the support frame 2, the threaded connection section screwed into the left half-clamp 41 is gradually screwed out. At the same time as it is screwed out, the other threaded connection section is screwed into the threaded hole of the support frame 2, so that both threaded connection sections are threadedly connected to the corresponding threaded connection objects. This tightens the sealing pole 3 on the support frame 2 to ensure the stability of the sealing pole 3 after it is connected to the support frame 2.

[0021] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. An indoor SF6 circuit breaker, comprising a chassis trolley (1), a support frame (2) mounted on the chassis trolley (1), and a plurality of solid-enclosed poles (3) mounted on the support frame (2), characterized in that: A sleeve (4) is inserted into the fixed sealing pole (3), and a connecting bolt (5) connected to the sleeve (4) is provided on the support frame (2). The sleeve (4) includes a left half-sleeve (41) and a right half-sleeve (42). One of the mating ends of the left half-sleeve (41) and the right half-sleeve (42) is a shaft rotation end, so that the opening or closing of the sleeve (4) is achieved by swinging the left half-sleeve (41) or the right half-sleeve (42) through the pin (6). The other mating end of the left half-sleeve (41) and the right half-sleeve (42) is a locking end, so that the left half-sleeve (41) or the right half-sleeve (42) cannot swing when the sleeve (4) is closed through the plug (7). The lower end of the plug (7) is also provided with a retainer (8) to prevent the plug (7) from disengaging from the mating end in a direction opposite to the insertion direction.

2. The indoor SF6 circuit breaker according to claim 1, characterized in that: Both ends of the left half-hoop (41) have notches (411), and both ends of the right half-hoop (42) have protrusions (421) that are inserted into the notches (411). One of the protrusions (421) is connected together by the pin (6) after being inserted into the notch (411), and the other protrusion (421) is connected together by the plug (7) after being inserted into the notch (411).

3. The indoor SF6 circuit breaker according to claim 2, characterized in that: The plug (7) includes a plug rod (71), a positioning block (72) located above the plug rod (71), and a connector (73) located below the plug rod (71). The plug rod (71) is inserted into the sleeve (4) after the protrusion (421) is placed into the notch (411). The positioning block (72) is held on the upper end face of the left half of the sleeve (41) by means of the size difference when the plug rod (71) is inserted into the sleeve (4). The connector (73) is exposed below the left half of the sleeve (41) and is assembled with the retainer (8) to prevent the plug rod (71) from coming out in a direction opposite to the insertion direction.

4. The indoor SF6 circuit breaker according to claim 3, characterized in that: The connector (73) has an insert post (731) that is inserted into the retainer (8), an abutment block (732) located at the lower end of the insert post (731), and a spring-back space (733) formed by tapering a portion of the insert post (731). The spring-back space (733) allows the retainer (8) to spring back to its initial shape after being inserted into the connector (73) and stretched open. After springing back to its initial shape, one end abuts against the lower end face of the left half hoop (41), and the other end abuts against the upper end face of the abutment block (732).

5. The indoor SF6 circuit breaker according to claim 4, characterized in that: The tapered portion of the inserted post (731) and the abutment block (732) together form a slot (734) that allows the retainer (8) to be inserted into and is arranged in a ring.

6. The indoor SF6 circuit breaker according to claim 5, characterized in that: The retainer (8) is a sheet-like component, which is bent to form an insert (81) and elastic portions (82) symmetrically distributed on both sides of the insert (81). The insert (81) uses its own through hole to pass through the abutment block (732) and inserts into the non-tapered part of the inserted post (731), and abuts against the lower end face of the left half hoop (41). The elastic portion (82) is flexible and can be inserted into the slot (734) by bending twice, and abuts against the upper end face of the abutment block (732).

7. The indoor SF6 circuit breaker of claim 1, wherein: One end of the connecting bolt (5) is threaded into the support frame (2), and the other end is threaded into the left half hoop (41).

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