Main shaft assembly for circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, and discloses a main shaft assembly for a circuit breaker, which comprises two protective shells, the front sides of the two protective shells are fixedly connected with fixed plates, the adjacent fixed plates are fixedly connected with the same fixed column, the outer wall of the fixed column is rotatably connected with a rotating sleeve, and the rotating sleeve is fixedly connected with the fixed column. A shaft body is fixedly connected to the rear side of the outer wall of the rotating sleeve, clamping columns are fixedly connected to the rear ends of the upper side and the lower side of the shaft body, a plurality of grooves are formed in the outer wall of the shaft body, sealing gaskets are fixedly connected to the interiors of the grooves, and a plurality of cooling fins are fixedly connected to the sides, away from each other, of the two protection shells. According to the utility model, the sealing gasket is attached to the shaft body, in a high-pressure environment, insulating gas is forcefully prevented from escaping outwards, in a low-pressure condition, external air can be prevented from being mixed in, and when heat generated in the circuit breaker is conducted to the fins and dissipated to the outside, the sealing performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a spindle assembly for a circuit breaker. Background Technology

[0002] The main shaft assembly of a circuit breaker is the core component for performing the circuit breaker's working actions. It transmits power to the operating mechanism to realize the circuit breaker's opening and closing operations. The transmission components of the cam assembly on the main shaft move accordingly, driving the moving contact to move through the connecting components, thus realizing the circuit breaker's closing or opening operation. When closing is required, the operating mechanism provides power to rotate the main shaft, driving the moving contact to move towards the stationary contact until the two make contact and complete the circuit connection. When opening is required, the operating mechanism acts again, causing the main shaft to rotate in the opposite direction, driving the moving contact to separate from the stationary contact and cut off the circuit.

[0003] In the main shaft of a circuit breaker, the sealing surface of the transmission shaft and the bearing assembly surface are on the same cylindrical surface. During assembly, the transition fit of the bearing can easily squeeze and scratch the sealing surface, resulting in poor fit between the sealing ring and the main shaft, causing gas leakage. Moreover, the shaft elastic retaining ring in some circuit breaker main shaft sealing assemblies is prone to falling off or breaking during long-term rotation of the main shaft, causing insulating gas to leak out and affecting the insulation performance of the system. Existing technology uses specially designed sealing grooves and sealing rings, setting multiple sealing grooves and installing sealing rings inside to enhance the sealing effect. However, in actual use, under high-temperature environments, the sealing material will soften and expand, resulting in a smaller sealing gap, increased friction between components, and even extrusion of the sealing material, leading to a decrease in sealing performance. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a spindle assembly for circuit breakers, which aims to improve the problem in the prior art where, under high-temperature environments, the sealing material softens and expands, resulting in a smaller sealing gap, increased friction between components, and even extrusion of the sealing material, leading to a decrease in sealing performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a spindle assembly for a circuit breaker, comprising two protective shells, each protective shell having a fixed plate fixedly connected to its front side, and the same fixed column fixedly connected between adjacent fixed plates, the outer wall of the fixed column having a rotating sleeve rotatably connected to it, the rear side of the outer wall of the rotating sleeve having a shaft fixedly connected to it, the upper and lower rear ends of the shaft having locking columns fixedly connected to it, the outer wall of the shaft having multiple grooves, the interior of each groove having a sealing gasket fixedly connected to it, multiple heat dissipation fins fixedly connected to the opposite sides of the two protective shells, and an installation mechanism provided inside the protective shell for quick installation of the protective shell.

[0006] As a further description of the above technical solution:

[0007] The installation mechanism includes two positioning blocks. The right sides of the two positioning blocks are fixedly connected to the upper and lower left sides of the right protective shell. Each of the four corners on the right side of the two protective shells has a threaded hole. Bolts are threaded into the interior of each of the threaded holes. Positioning grooves are provided on the upper and lower right sides of the left protective shell. Nuts are threaded into the left ends of each of the bolts.

[0008] As a further description of the above technical solution:

[0009] Two mounting blocks are fixedly connected to the opposite sides of the two protective shells, and threaded holes are provided on the front side of each of the mounting blocks.

[0010] As a further description of the above technical solution:

[0011] Each of the multiple positioning slots has a gasket threaded to its left end, and all of the gaskets have a smooth design.

[0012] As a further description of the above technical solution:

[0013] Both of the protective shells are fixedly connected to the top front side with hinges, and both of the hinges are fixedly connected to the same protective sleeve at the bottom.

[0014] As a further description of the above technical solution:

[0015] A handle is fixedly connected to the front side of the protective cover, and the handle has multiple slots inside.

[0016] As a further description of the above technical solution:

[0017] Multiple heat dissipation fins are fixedly connected at equal intervals to the opposite sides of the two protective shells, and multiple sealing gaskets match the grooves.

[0018] As a further description of the above technical solution:

[0019] The diameters of the two positioning blocks are both smaller than the diameter of the positioning groove, and the plurality of threaded holes are all equidistantly opened on the right side of the protective shell.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, the sealing gasket at the shaft body is tightly fitted to the contact point between the shaft body and the outside. Under high pressure, it strongly prevents the insulating gas from escaping outward. Under low pressure, it can also prevent the outside air from mixing in, ensuring a stable internal gas environment. When heat is generated inside the circuit breaker, the heat is conducted to the fins and then quickly dissipated to the outside through air convection, thereby improving the sealing performance.

[0022] 2. In this utility model, when installing the circuit breaker protective shell, align the positioning block and insert it into the positioning groove to prevent installation misalignment. Screw the bolt into the threaded hole at the right corner of the protective shell. After the bolt passes through, tighten the nut to the end and tighten it with a tool. The bolt and nut cooperate to tightly connect the two protective shells, making the protective shell stable and able to resist collisions and vibrations, thereby realizing the rapid installation of the protective shell. Attached Figure Description

[0023] Figure 1 This is a perspective view of a spindle assembly for a circuit breaker proposed in this utility model;

[0024] Figure 2 This is a front view of a spindle assembly for a circuit breaker according to the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of a rotating sleeve for a main shaft assembly of a circuit breaker according to the present invention.

[0026] Figure 4 This is an exploded view of a sealing gasket for the spindle assembly of a circuit breaker according to the present invention.

[0027] Figure 5 This is an exploded view of the bolts in the main shaft assembly of a circuit breaker according to the present invention.

[0028] Figure 6 This is a schematic diagram of the structure of a positioning block for a main shaft assembly of a circuit breaker, as proposed in this utility model.

[0029] Legend:

[0030] 1. Protective shell; 2. Mounting mechanism; 201. Positioning block; 202. Threaded hole one; 203. Bolt; 204. Positioning groove; 205. Nut; 3. Fixing plate; 4. Fixing column; 5. Rotating sleeve; 6. Shaft; 7. Engaging column; 8. Groove; 9. Sealing gasket; 10. Heat dissipation fins; 11. Mounting block; 12. Threaded hole two; 13. Gasket; 14. Hinge; 15. Protective sleeve; 16. Handle; 17. Groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 3 and Figure 4 The present invention provides an embodiment of a main shaft assembly for a circuit breaker, comprising two protective shells 1, each with a fixed plate 3 fixedly connected to its front side, and a fixed column 4 fixedly connected between adjacent fixed plates 3. A rotating sleeve 5 is rotatably connected to the outer wall of the fixed column 4, and a shaft 6 is fixedly connected to the rear side of the outer wall of the rotating sleeve 5. By rotating the rotating sleeve 5, the shaft 6 rotates up and down. A locking column 7 is fixedly connected to the upper and lower rear ends of the shaft 6 for controlling the switching of the circuit breaker. Multiple grooves 8 are provided on the outer wall of the shaft 6, and sealing gaskets 9 are fixedly connected inside the multiple grooves 8 for sealing gas. Multiple heat dissipation fins 10 are fixedly connected to the opposite sides of the two protective shells 1 for heat dissipation of the internal structure. An installation mechanism 2 is provided inside the protective shell 1 for quick installation of the protective shell 1.

[0033] Specifically, the fixed plates 3 fixed to the front of the two protective shells 1 provide stable support for the entire connection structure. The same fixed column 4 fixed between the two fixed plates 3 is an important basis for realizing the rotation function. The rotating sleeve 5 can rotate flexibly on the outer wall of the fixed column 4. When the rotating sleeve 5 is rotated, the shaft 6 fixed to it can rotate up and down. The locking columns 7 fixed to the upper and lower rear ends of the shaft 6 can accurately control the circuit breaker switch when the shaft 6 rotates, realizing the circuit opening and closing operation. The multiple grooves 8 opened on the outer wall of the shaft 6 are all fixedly connected with sealing gaskets 9. These sealing gaskets 9 effectively prevent gas leakage and ensure the stability of the internal environment. On the side of the two protective shells 1 that are far apart, multiple heat dissipation fins 10 are fixedly connected, which can quickly dissipate the heat generated by the internal structure of the protective shell 1 and ensure that each component works at a suitable temperature.

[0034] Reference Figure 5 and Figure 6 The installation mechanism 2 includes two positioning blocks 201. The right side of the two positioning blocks 201 is fixedly connected to the upper and lower left sides of the right protective shell 1. Threaded holes 202 are provided at the four corners on the right side of the two protective shells 1. Bolts 203 are threaded into the interior of the multiple threaded holes 202. Positioning grooves 204 are provided at the upper and lower right sides of the left protective shell 1. The positioning blocks 201 are inserted into the positioning grooves 204. The bolts 203 are rotated into the threaded holes 202. Nuts 205 are threaded into the left ends of the multiple bolts 203. The nuts 205 are then rotated to the ends of the bolts 203 to fix them.

[0035] Specifically, the two positioning blocks 201 located at the upper and lower left ends of the right protective shell 1 are precisely inserted into the corresponding positioning grooves 204 at the upper and lower right ends of the left protective shell 1 during installation. This initially determines the relative position of the two protective shells 1, serving as a positioning and anti-displacement function. At the same time, threaded holes 202 are provided at the four corners on the right side of the two protective shells 1. Bolts 203 are screwed into these holes, with their left ends protruding. Nuts 205 are then screwed onto the ends of bolts 203 and tightened, thereby fixing the left and right protective shells 1 and ensuring the overall structural stability of the protective shells 1, providing reliable protection for the internal components.

[0036] Reference Figure 1 and Figure 2 Two mounting blocks 11 are fixedly connected to the opposite sides of the two protective shells 1. The front side of each mounting block 11 is provided with threaded holes 12 for easy installation on a wall or other location. The left end of each positioning groove 204 is threaded with a washer 13. The washer 13 is rounded to prevent the nut 205 from being tightened. The top front side of each of the two protective shells 1 is fixedly connected with a hinge 14. The bottom of each of the two hinges 14 is fixedly connected with the same protective sleeve 15 to prevent rainwater from entering the rotating sleeve 5.

[0037] Specifically, two mounting blocks 11 are fixed on the opposite sides of the two protective shells 1. Each mounting block 11 has a threaded hole 12 on its front side, which allows the protective shell 1 to be installed on a wall or other designated location using matching screws. The smooth washers 13 connected to the left ends of the multiple positioning slots 204 effectively prevent over-tightening during the tightening of the nuts 205, thus avoiding damage to related components. The hinges 14 fixed to the top front side of the two protective shells 1 are connected to the protective sleeves 15 below, which can protect the rotating sleeve 5, prevent rainwater from entering, and ensure stable operation of the equipment in a humid environment.

[0038] Reference Figure 1 and Figure 2 A handle 16 is fixedly connected to the front side of the protective cover 15 to facilitate opening the protective cover 15. Multiple slots 17 are provided inside the handle 16 to fit the fingers. Multiple heat dissipation fins 10 are fixedly connected at equal intervals to the opposite sides of the two protective shells 1. Multiple sealing gaskets 9 match the grooves 8. The diameters of the two positioning blocks 201 are smaller than the diameter of the positioning grooves 204. Multiple threaded holes 202 are equidistantly opened on the right side of the protective shell 1.

[0039] Specifically, a handle 16 is fixed to the front of the protective cover 15, making it easy for users to open the protective cover 15 and view or maintain the internal rotating sleeve 5. The multiple slots 17 inside the handle 16 are designed to fit the fingers and make gripping more comfortable. The heat dissipation fins 10 are evenly distributed on the side of the protective shell 1 to maximize heat dissipation. The sealing gasket 9 is precisely matched with the groove 8 to ensure gas sealing. The diameter of the positioning block 201 is smaller than that of the positioning groove 204, which facilitates installation and positioning. The threaded holes 202 are evenly opened on the right side of the protective shell 1 to ensure uniform force during installation.

[0040] Working principle: When an external force drives the rotating sleeve 5 to rotate, the shaft 6 connected to it will rotate up and down accordingly. Similar to the lever principle, the circular motion of the rotating sleeve 5 is converted into the up-and-down swinging motion of the shaft 6. During the rotation of the shaft 6, the engaging column 7 cooperates with the switching components inside the circuit breaker. When the shaft 6 rotates to a specific angle, the engaging column 7 pushes or pulls the switch, completing the circuit connection or disconnection operation, achieving precise control of power transmission. The sealing gasket 9 in the groove 8 on the outer wall of the shaft 6 fits against the contact area between the shaft 6 and the external parts, effectively preventing gas leakage, especially in high-pressure environments where it prevents the escape of insulating gas. Whether in a low-pressure environment or to prevent outside air from mixing in, the sealing gasket 9 can ensure the stability of the internal environment and maintain the gas atmosphere for normal operation of the equipment. The heat dissipation fins 10, which are distributed on the side of the protective shell 1 away from the outside, will generate a lot of heat when the internal structure of the circuit breaker is running. With its large area of ​​metal material, the heat dissipation fins 10 are in full contact with the outside air. The heat is transferred from the inside of the protective shell 1 to the heat dissipation fins 10 through heat conduction. Then, the heat is quickly dissipated to the surrounding environment by air convection, ensuring that each component is always at a suitable operating temperature and avoiding performance degradation or failure due to overheating.

[0041] At the beginning of installation, the two positioning blocks 201 need to be inserted into the corresponding positioning slots 204 at the upper and lower ends of the right side of the left protective shell 1 to effectively prevent positional displacement during subsequent installation steps. Threaded holes 202 are evenly distributed at the four corners on the right side of the two protective shells 1. Screw the bolt 203 into the threaded hole 202. As the bolt 203 is screwed in, its left end will gradually protrude from the protective shell 1. Tighten the nut 205 to the protruding end of the bolt 203 and use a tool to tighten the nut 205, so that the bolt 203 and the nut 205 cooperate to connect the left and right protective shells 1 together. This ensures the stability of the overall structure of the protective shell 1, allowing it to withstand possible external collisions, vibrations, and other interference factors. It provides reliable protection for precision components such as the internal circuit breaker spindle assembly, protecting them from damage by external environmental factors and ensuring long-term stable operation of the equipment.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A main shaft assembly for a circuit breaker comprising two protective casings (1), characterized in that: The front side of two protective shells (1) is fixedly connected with a fixed plate (3), the adjacent two fixed plates (3) are fixedly connected with a same fixed column (4), the outer wall of the fixed column (4) is rotatably connected with a rotating sleeve (5), the outer wall rear side of the rotating sleeve (5) is fixedly connected with a shaft body (6), the upper and lower rear ends of the shaft body (6) are fixedly connected with a clamping column (7), a plurality of recesses (8) are formed in the outer wall of the shaft body (6), a plurality of sealing gaskets (9) are fixedly connected in the recesses (8), the opposite sides of the two protective shells (1) are fixedly connected with a plurality of heat dissipation fins (10), and the inside of the protective shell (1) is provided with a mounting mechanism (2).

2. An arbor assembly for a circuit breaker according to claim 1, wherein: The mounting mechanism (2) comprises two positioning blocks (201), the right sides of the two positioning blocks (201) are fixedly connected to the left sides of the upper and lower ends of the right protective shell (1), threaded holes (202) are formed in the four corners of the right sides of the two protective shells (1), the inside of the threaded holes (202) is screwed with a bolt (203), the right sides of the upper and lower ends of the left protective shell (1) are provided with a positioning groove (204), and the left ends of the plurality of bolts (203) are screwed with a nut (205).

3. The spindle assembly for a circuit breaker of claim 1, wherein: The opposite sides of the two protective shells (1) are fixedly connected with two mounting blocks (11), and the front sides of the plurality of mounting blocks (11) are provided with threaded holes (12).

4. The spindle assembly for a circuit breaker of claim 2, wherein: The left ends of the plurality of positioning grooves (204) are screwed with a gasket (13), and the plurality of gaskets (13) are designed to be round and smooth.

5. The spindle assembly for a circuit breaker of claim 1, wherein: The top of the front side of the two protective shells (1) is fixedly connected with a hinge (14), and the bottom of the two hinges (14) is fixedly connected with a same protective sleeve (15).

6. A spindle assembly for a circuit breaker according to claim 5 wherein: The front side of the protective sleeve (15) is fixedly connected with a handle (16), and the inside of the handle (16) is provided with a plurality of notches (17).

7. The spindle assembly for a circuit breaker of claim 1, wherein: The plurality of heat dissipation fins (10) are fixedly connected to the opposite sides of the two protective shells (1) at equal intervals, and the plurality of sealing gaskets (9) are matched with the recesses (8).

8. The spindle assembly for a circuit breaker of claim 2, wherein: The diameters of the two positioning blocks (201) are smaller than the diameters of the positioning grooves (204), and the plurality of threaded holes (202) are formed in the right side of the protective shell (1) at equal intervals.

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