A side-mounted vacuum circuit breaker

Abstract

The present invention discloses a side-mounted vacuum circuit breaker, comprising a vacuum interrupter, an operating mechanism, and a side-mounted fixture. The vacuum interrupter is connected to the rear side of the operating mechanism via the side-mounted fixture. The operating mechanism comprises a housing, a spring, a main shaft, a second intermediate gear, and a second lower driving gear mounted within the housing. The main shaft is linked to the insulating pull rod of the vacuum interrupter via a transmission mechanism. The spring is connected to one end of the main shaft. The second intermediate gear is sleeved on the main shaft, and the second lower driving gear meshes with the second intermediate gear. The second intermediate gear has a circle of teeth distributed along its side, and the reference axis formed by the circle of teeth coincides with the reference axis of the second intermediate gear. The present invention eliminates the upper drive gear and secondary transmission gear within the housing and utilizes an external second energy storage motor, resulting in fewer assembly and disassembly steps and higher maintenance efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum circuit breakers, and in particular relates to a side-mounted vacuum circuit breaker. Background Art

[0002] Vacuum circuit breakers are a type of switchgear widely used in power systems. Based on the installation method, vacuum circuit breakers are classified into fixed vacuum circuit breakers, trolley-mounted vacuum circuit breakers, side-mounted vacuum circuit breakers, etc. In comparison, side-mounted vacuum circuit breakers have the following advantages:

[0003] 1. The overall structure is compact, especially for small side-mounted vacuum circuit breakers, with an internal space utilization rate of 60% to 75%, and some high-end models as high as 80%. Therefore, its horizontal installation can reduce the depth of the switchgear, making it particularly suitable for compact ring main units.

[0004] 2. The compact structure not only reduces the installation space, but also reduces the overall size, which can shorten the conductive circuit, correspondingly reducing heat generation and improving heat dissipation.

[0005] 3. Side-mounted vacuum circuit breakers mostly adopt a modular design. For example, the vacuum interrupter, operating mechanism, side-mounted fixed components, etc. each form a module. The interrupter, operating mechanism, etc. can be replaced separately, which is convenient for maintenance. Among them, the operating mechanism is one of the core modules of the side-mounted vacuum circuit breaker, which is used to realize the closing and opening operations of the circuit breaker. The spring operating mechanism is the most common. The energy storage spring of the spring operating mechanism can quickly close and open the circuit breaker through the transmission system, and the response speed is fast. The spring operating mechanism includes a first lower drive gear 102 that is unidirectionally connected to the first energy storage handle 106, an upper drive gear 103 that is unidirectionally connected to the first energy storage motor 104, and a crank mechanism connected to the energy storage spring; the intermediate transmission shaft of the crank mechanism is provided with a first intermediate gear 101, and the first lower drive gear 102 and the upper drive gear 103 are respectively engaged with the first intermediate gear 101. If the first energy charging handle 106 drives the first lower drive gear 102 to rotate, the first intermediate gear 101 accordingly drives the crank mechanism to pull the spring. However, because the upper drive gear 103 is a one-way transmission, the upper drive gear 103 rotates with the first intermediate gear 101 and cannot drive the first energy charging motor 104 to rotate. Similarly, if the first energy charging motor 104 drives the upper drive gear 103 to rotate, the first intermediate gear 101 accordingly drives the crank mechanism to pull the spring. However, because the first lower drive gear 102 is a one-way transmission, the first lower drive gear 102 rotates with the first intermediate gear 101 and cannot drive the first energy charging handle 106 to rotate.

[0006] Although the transmission structures of manual energy storage and electric energy storage operate independently without affecting each other, the first lower drive gear 102, the first intermediate gear 101, the upper drive gear 103, the first energy storage motor 104, and the secondary transmission gear 105 corresponding to the first energy storage motor 104 all occupy a large amount of internal space in the compact internal space of the side-mounted vacuum circuit breaker, resulting in the following problems:

[0007] 1. The first energy storage motor 104 itself has a high failure rate. Within the compact housing, replacing the first energy storage motor 104 or other damaged parts requires disassembling healthy parts that block them. This requires many healthy parts and multiple disassembly steps, resulting in low replacement efficiency. Furthermore, the installation process also requires sequential installation, slowing down maintenance.

[0008] 2. The upper driving gear 103, the first energy storage motor 104 and the secondary transmission gear 105 corresponding to the first energy storage motor 104 have a large dedicated space, which is not conducive to optimizing the distribution of internal parts. Summary of the Invention

[0009] In response to the shortcomings of the prior art, the present invention provides a side-mounted vacuum circuit breaker, comprising a vacuum interrupter, an operating mechanism, and a side-mounted fixing member, wherein the vacuum interrupter is connected to the rear side of the operating mechanism via the side-mounted fixing member; the operating mechanism comprises a housing, a spring, a main shaft, a second intermediate gear, and a second lower driving gear installed within the housing; the main shaft is linked to an insulating pull rod of the vacuum interrupter via a transmission mechanism; the spring is connected to one end of the main shaft; the second intermediate gear is sleeved on the main shaft, and the second lower driving gear is meshed with the second intermediate gear; a circle of gear teeth is distributed on the side surface of the second intermediate gear, and a reference axis formed by the circle of gear teeth coincides with the reference axis of the second intermediate gear; the circuit breaker also comprises a second energy storage motor located outside the housing; an intermediate shaft is provided on the side wall of the housing, one end of the intermediate shaft is transmission-connected to the output shaft of the second energy storage motor, and the other end of the intermediate shaft is provided with a bevel gear adapted to the circle of gear teeth, and the bevel gear meshes with the circle of gear teeth, thereby causing the second energy storage motor to drive the second intermediate gear to rotate.

[0010] In a preferred embodiment of the side-mounted vacuum circuit breaker of the present invention, the output shaft of the second energy storage motor is connected to the intermediate shaft via a reduction spur gear set, and the intermediate shaft is connected to the reduction spur gear set via a one-way bearing. The reduction spur gear set increases the torsional torque of the second energy storage motor and reduces the load on the second energy storage motor.

[0011] A preferred embodiment of the side-mounted vacuum circuit breaker of the present invention comprises: an intermediate shaft rotatably connected to the rear wall of the housing via a tapered roller bearing; the rear wall of the housing is provided with a through-hole adapted to fit the outer ring of the tapered roller bearing, and the through-hole is provided with a step corresponding to the smaller diameter end of the outer ring; the larger end of the inner ring of the tapered roller bearing is provided with an outer surface protruding from the rear wall, and the rear wall is provided with a positioning member for limiting the axial movement of the inner ring. The intermediate shaft is fixedly connected to the inner ring. During transmission, the intermediate shaft is subjected to axial and radial stresses. After the positioning member locks the axial position of the inner ring, the intermediate shaft can only rotate, and the bevel gear and the corresponding gear teeth remain engaged.

[0012] The preferred embodiment of the side-mounted vacuum circuit breaker of the present invention is as follows: the positioning member includes a fixed plate with a concave cross-section and a positioning plate with an L-shaped cross-section; the fixed plate is fixedly connected to the outer surface of the rear side wall of the housing, and the inner ring of the tapered roller bearing protrudes from the gap between the rear side wall and the fixed plate; a side wall of the positioning plate is inserted into the gap and contacts the inner ring, thereby limiting the axial movement of the inner ring. Specifically, the side of the fixed plate that contacts the positioning plate is an upper inclined surface, and the positioning plate is provided with a lower inclined surface corresponding to the upper inclined surface. The positioning plate is inserted into the gap so that the upper inclined surface presses against the lower inclined surface. If a part inside the housing is damaged, the intermediate shaft or bevel gear needs to be disassembled before replacing the damaged part. In this case, the positioning plate can be removed, and the inner ring and intermediate shaft can be removed axially, allowing the intermediate shaft to be quickly disassembled, reducing the number of disassembly steps required to replace the damaged part and the number of normal parts to be disassembled, thereby shortening the maintenance schedule.

[0013] A preferred embodiment of the side-mounted vacuum circuit breaker of the present invention comprises: the intermediate shaft extending through a positioning plate, which is provided with a notch corresponding to the intermediate shaft; and the other side wall of the positioning plate is fixedly connected to the rear wall of the housing via a locking member. The locking member is a conventional locking part such as a screw or bolt, making the positioning plate easy to disassemble and maintain.

[0014] The beneficial effects of the side-mounted vacuum circuit breaker of the present invention are:

[0015] 1. The second energy storage motor is externally located and connected to the second intermediate gear via an intermediate shaft, a ring of gear teeth, and a bevel gear. Similar to existing electric energy storage methods, the second energy storage motor drives the energy storage spring, achieving the same effect as a built-in second energy storage motor. However, the external second energy storage motor offers the advantages of easier motor replacement, fewer disassembly steps, and higher maintenance efficiency.

[0016] 2. Compared with existing operating mechanisms, the upper drive gear and secondary transmission gear inside the housing are eliminated, providing more installation space for other parts inside the housing. In addition, if parts inside the housing are damaged, especially those located behind the upper drive gear and secondary transmission gear, the repair steps of disassembling and installing the upper drive gear and secondary transmission gear are eliminated, freeing up space for repair operations and significantly reducing the overall repair steps and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the internal structure of an existing side-mounted vacuum circuit breaker;

[0019] Figure 2 Schematic diagram of the internal structure of the side-mounted vacuum circuit breaker in the present invention;

[0020] Figure 3 The three-dimensional side-mounted vacuum circuit breaker of the present invention Figure 1 ;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 The three-dimensional side-mounted vacuum circuit breaker of the present invention Figure 2 ;

[0023] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0024] Figure 7 for Figure 5 A cross-sectional view of the middle positioning member;

[0025] Figure 8 The three-dimensional positioning member of the present invention Figure 1 ;

[0026] Figure 9 The three-dimensional positioning member of the present invention Figure 2 .

[0027] Reference numerals: first intermediate gear 101, first lower driving gear 102, upper driving gear 103, first energy storage motor 104, secondary transmission gear 105, first energy storage handle 106, vacuum interrupter 201, side fixing member 202, box body 203, angle code 204, insulating pull rod 205, spring 206, main shaft 207, second intermediate gear 208, second lower driving gear 209, crank 210, one-way bearing 211, gear teeth 212 , intermediate shaft 213, reduction spur gear set 214, bevel gear 215, second energy storage handle 216, center shaft 217, tapered roller bearing 218, rear side wall 219, outer ring 220, through hole 221, step 222, inner ring 223, fixing plate 224, positioning plate 225, upper inclined surface 226, lower inclined surface 227, guide protrusion 228, guide groove 229, second energy storage motor 230, empty space 231, sinking groove 232, and notch 233. DETAILED DESCRIPTION

[0028] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principles, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0029] like Figure 3 As shown, this embodiment provides a side-mounted vacuum circuit breaker, including a vacuum interrupter 201, an operating mechanism, and a side-mounted fixture 202. The vacuum interrupter 201 is connected to the rear side of the operating mechanism via the side-mounted fixture 202. The operating mechanism includes a housing 203, the rear side wall 219 of which is fixedly connected to the side-mounted fixture 202 via an angle bracket 204. Three vacuum interrupters 201 are provided, and the three vacuum interrupters 201 are arranged in a straight line along the length direction of the side-mounted fixture 202 and fixed to the side-mounted fixture 202. The insulating pull rod 205 is located inside the side-mounted fixture 202.

[0030] like Figure 2As shown, the operating mechanism in this embodiment also includes a spring 206, a main shaft 207, a second intermediate gear 208, and a second lower driving gear 209 installed in the housing 203. The main shaft 207 is linked to the insulating pull rod 205 of the vacuum interrupter 201 through a transmission mechanism. The upper end of the spring 206 is connected to the swing shaft in the housing 203, and the lower end of the spring 206 is connected to the crank 210 at one end of the main shaft 207. The second intermediate gear 208 is sleeved on the main shaft 207 via a one-way bearing 211. The second lower driving gear 209 is meshed with the second intermediate gear 208. The central axis 217 of the second lower driving gear 209 is connected to the second energy storage handle 216 via the one-way bearing 211. When the second energy storage handle 216 is moved downward, the second lower driving gear 209 drives the second intermediate gear 208 to rotate. However, when the second energy storage handle 216 is moved upward, the second lower driving gear 209 cannot be driven to rotate.

[0031] This embodiment also includes a second energy storage motor 230 located on the rear side of the box body 203. After the second energy storage motor 230 is externalized, if the second energy storage motor 230 fails, it can be quickly disassembled and assembled. Compared with the existing vacuum circuit breaker with a built-in second energy storage motor 230, the replacement difficulty is significantly reduced, the time taken to replace the second energy storage motor 230 is greatly shortened, and the maintenance efficiency is significantly improved.

[0032] In this embodiment, the transmission structure of the second energy storage motor 230 and the second intermediate gear 208 is as follows:

[0033] A circle of gear teeth 212 is distributed along the side of the second intermediate gear 208, and the reference axis formed by the circle of gear teeth 212 coincides with the reference axis of the second intermediate gear 208. The second intermediate gear 208 is equivalent to a spur gear and a bevel gear combined to form an integrated structure, but the integrated structure is smaller and occupies less space.

[0034] like Figure 3 and Figure 4 As shown, an intermediate shaft 213 is provided on the side wall of the housing 203. One end of the intermediate shaft 213 is drivingly connected to the output shaft of the second energy storage motor 230. Specifically, the output shaft of the second energy storage motor 230 and the intermediate shaft 213 are drivingly connected via a reduction spur gear set 214, which is connected to the intermediate shaft 213 via a one-way bearing 211. The reduction spur gear set 214 increases the torsional torque of the second energy storage motor 230 and reduces the load on the second energy storage motor 230. The other end of the intermediate shaft 213 is provided with a bevel gear 215 that matches the ring of gear teeth 212. The bevel gear 215 meshes with the ring of gear teeth 212, forming a 90-degree transmission relationship.

[0035] In this embodiment, the intermediate shaft 213, a ring of gear teeth 212, and bevel gear 215 are connected by a transmission mechanism between the second energy storage motor 230 and the second intermediate gear 208. The second energy storage motor 230 drives the main shaft 207 of the second intermediate gear 208 to rotate a certain angle, thereby rotating the crank 210 at one end of the main shaft 207 by a corresponding angle and pulling the spring 206 to its maximum extension. If the pull spring 206 is released, the pull spring 206 causes the crank 210 to flip, but the crank 210 does not drive the main shaft 207 to rotate. Furthermore, the transmission structure of the second energy storage handle 216 and the second energy storage motor 230 in this embodiment operates independently and does not affect each other.

[0036] In order to ensure that the bevel gear 215 is effectively meshed with the gear teeth 212 of one circle and facilitate quick disassembly and assembly of the intermediate shaft 213 and the bevel gear 215, the following structure is used to fix the intermediate shaft 213 in this embodiment:

[0037] like Figures 5 to 9As shown, intermediate shaft 213 is rotatably connected to rear sidewall 219 of housing 203 via tapered roller bearing 218. Rear sidewall 219 of housing 203 is provided with a through-hole 221 adapted to fit the outer ring 220 of tapered roller bearing 218. Through-hole 221 is also provided with a step 222 corresponding to the smaller diameter end of outer ring 220. The larger end of inner ring 223 of tapered roller bearing 218 has an outer surface protruding from rear sidewall 219, and rear sidewall 219 is provided with a positioning member to limit axial movement of inner ring 223. Intermediate shaft 213 is fixedly connected to inner ring 223. During transmission, intermediate shaft 213 is subjected to axial and radial stresses. After the positioning member locks the axial position of inner ring 223, intermediate shaft 213 can only rotate, and bevel gear 215 and corresponding gear teeth 212 remain engaged. The positioning member includes a fixing plate 224 with a concave cross-section and a positioning plate 225 with an L-shaped cross-section. The fixing plate 224 is fixedly connected to the outer surface of the rear side wall 219 of the housing 203, and the inner ring 223 of the tapered roller bearing 218 protrudes from the gap 231 between the rear side wall 219 and the fixing plate 224. A side wall of the positioning plate 225 is inserted into the gap 231 and contacts the inner ring 223, thereby limiting the axial movement of the inner ring 223. Specifically, the surface of the fixing plate 224 that contacts the positioning plate 225 is an upper inclined surface 226. The positioning plate 225 is provided with a lower inclined surface 227 corresponding to the upper inclined surface 226. By inserting the positioning plate 225 into the gap 231, the upper inclined surface 226 is pressed against the lower inclined surface 227. To control the stress between the positioning plate 225 and the inner ring 223 and prevent excessive stress from hindering the inner ring 223's rotation, a recessed groove 232 is provided on the side of the positioning plate 225 to mate with the inner ring 223. The protrusion of the inner ring 223 protruding from the rear sidewall 219 fits snugly within the recessed groove 232, preventing excessive stress between the inner ring 223 and the outer ring. If a component within the housing 203 is damaged, the intermediate shaft 213 or bevel gear 215 must be disassembled before replacing the damaged component. In this case, the positioning plate 225 can be removed, and the inner ring 223 and intermediate shaft 213 can be removed axially, allowing for quick removal of the intermediate shaft 213. This reduces the number of disassembly steps required to replace the damaged component and the number of undamaged components disassembled, thus shortening the repair process. Furthermore, the positioning plate 225 is equipped with two longitudinal guide protrusions 228, while the rear sidewall 219 has guide grooves 229 corresponding to the guide protrusions 228. The guide protrusions 228 are inserted along the guide grooves 229, making assembly easier.

[0038] In this embodiment, the intermediate shaft 213 passes through the positioning plate 225. The positioning plate 225 has a hole that is larger than the intermediate shaft 213 and the bevel gear 215, and a notch 233 corresponding to the intermediate shaft 213. The other side wall of the positioning plate 225 is fixedly connected to the rear side wall 219 of the box body 203 by a locking member.

[0039] In this embodiment, the second energy storage motor 230 is easy to disassemble, and the intermediate shaft 213 or the bevel gear 215 is also easy to disassemble. The specific disassembly method is as follows:

[0040] S1. Disassemble the second energy storage motor 230.

[0041] S2. Remove the locking piece and take the positioning plate 225 upwards.

[0042] S3. Since the inner ring 223 and the outer ring 220 of the tapered roller bearing 218 are separable, the inner ring 223 can be easily separated, and the intermediate shaft 213 can be taken out of the housing 203 along the axial direction.

[0043] The disassembly process only requires three steps to complete. Conversely, the installation process can be completed in the order of S3 to S1. The entire disassembly and assembly process is very simple. While freeing up the internal space of the box 203, it reduces the difficulty of replacing other parts in the box 203 and improves maintenance efficiency.

[0044] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make some simple deductions or substitutions without departing from the concept of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A side-mounted vacuum circuit breaker, comprising a vacuum interrupter, an operating mechanism, and a side-mounted fixture, wherein the vacuum interrupter is connected to the rear side of the operating mechanism via the side-mounted fixture; the operating mechanism comprises a housing, a spring mounted within the housing, a main shaft, a second intermediate gear, and a second lower driving gear; the main shaft is linked to an insulating pull rod of the vacuum interrupter via a transmission mechanism; the spring is connected to one end of the main shaft; the second intermediate gear is sleeved on the main shaft, and the second lower driving gear meshes with the second intermediate gear; Its characteristics are: A circle of gear teeth is distributed on the side surface of the second intermediate gear, and the reference axis formed by the circle of gear teeth coincides with the reference axis of the second intermediate gear; The second energy storage motor is located outside the box body. An intermediate shaft is provided on the side wall of the box body. One end of the intermediate shaft is drivingly connected to the output shaft of the second energy storage motor. The other end of the intermediate shaft is provided with a bevel gear adapted to a circle of gear teeth. The bevel gear meshes with the circle of gear teeth, thereby causing the second energy storage motor to drive the second intermediate gear to rotate. The output shaft of the second energy storage motor is connected to the intermediate shaft via a reduction spur gear set, and the intermediate shaft is connected to the reduction spur gear set via a one-way bearing; The intermediate shaft is rotatably connected to the rear side wall of the housing through a tapered roller bearing; the rear side wall of the housing is provided with a through hole adapted to fit the outer ring of the tapered roller bearing, and the through hole is provided with a step corresponding to the end with the smaller diameter of the outer ring; the larger end of the inner ring of the tapered roller bearing is provided with an outer surface protruding from the rear side wall, and the rear side wall is provided with a positioning member for limiting axial movement of the inner ring; The positioning member includes a fixed plate with a concave cross-section and a positioning plate with an L-shaped cross-section; the fixed plate is fixedly connected to the outer surface of the rear side wall of the box body, and the inner ring of the tapered roller bearing protrudes from the gap between the rear side wall and the fixed plate; one side wall of the positioning plate is inserted into the gap and contacts the inner ring, thereby limiting the axial movement of the inner ring.

2. A side-mounted vacuum circuit breaker according to claim 1, characterized in that: The side of the fixing plate in contact with the positioning plate is an upper inclined surface, and the positioning plate is provided with a lower inclined surface corresponding to the upper inclined surface. The positioning plate is inserted into the empty space so that the upper inclined surface presses against the lower inclined surface.

3. The side-mounted vacuum circuit breaker according to claim 2, characterized in that: The intermediate shaft passes through the positioning plate, and the positioning plate is provided with a notch corresponding to the intermediate shaft; the other side wall of the positioning plate is fixedly connected to the rear side wall of the box body through a locking piece.

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