Front opening spring mechanism of circuit breaker

Abstract

The utility model belongs to the field of high-voltage switch equipment, and particularly relates to a front-mounted opening spring mechanism of a circuit breaker, which comprises a rack, a closing spring, a driving main shaft, an output crank arm, a connecting rod, an output shaft and an opening spring, and is characterized in that the fixed end of the closing spring is fixedly connected with the rack, and the free end of the closing spring is in transmission connection with the driving main shaft; the driving main shaft, the output crank arm, the connecting rod and the output shaft are in transmission fit in sequence to form a closing driving transmission pair, the fixed end of the opening spring is fixedly connected with the rack, and the free end of the opening spring is connected with the output crank arm. According to the utility model, the opening spring is preposed, so that the free end of the opening spring is matched with the output connecting lever, and when the closing spring releases energy to drive closing, driving energy is sequentially transmitted to the output shaft through the driving main shaft, the output connecting lever and the connecting rod to drive closing and is also directly transmitted to the free end of the opening spring through the driving main shaft and the output connecting lever, so that the opening spring stores energy; the free end of the opening energy storage is located at the middle position of the closing spring energy release output transmission system, so that energy loss is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of high voltage switchgear, specifically relating to a circuit breaker front-mounted trip spring mechanism. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions. It automatically disconnects the circuit in the event of severe overload, short circuit, or undervoltage faults. The circuit breaker operating mechanism is its core component. The trip spring, during the circuit breaker's tripping operation, releases stored energy to quickly pull the moving contact open, enabling the circuit breaker to rapidly disconnect the circuit and achieve circuit protection and control. Currently, as disclosed in patent CN202110981611.9, the tripping spring typically releases energy to drive the output shaft for closing operations. Simultaneously, the tripping crank arm on the output shaft drives the stored energy of the tripping spring. This means the free end of the tripping energy storage is located at the final stage of the closing spring's energy release output transmission system, resulting in significant energy loss. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a circuit breaker front-mounted opening spring mechanism.

[0004] The technical solution adopted by this utility model is as follows: a circuit breaker front-mounted opening spring mechanism, including a frame, a closing spring, a drive main shaft, an output crank arm, a connecting rod, an output shaft, and an opening spring. The fixed end of the closing spring is fixedly connected to the frame and the free end is drivenly connected to the drive main shaft. The drive main shaft, the output crank arm, the connecting rod, and the output shaft are sequentially driven to form a closing drive transmission pair. The fixed end of the opening spring is fixedly connected to the frame and the free end is connected to the output crank arm.

[0005] The output crank arm includes a central rotating shaft and a first crank arm and a second crank arm connected to the central rotating shaft. A first roller is rotatably connected to the end of the first crank arm, and the end of the second crank arm is hinged to a connecting rod. The connecting rod is hinged to the output shaft. A cam is provided on the drive shaft, and the cam is in drive engagement with the first roller.

[0006] The free end of the shunt spring is connected to the second crank arm.

[0007] The free end of the gate spring is hinged to the second crank arm via a first pivot, and the first pivot is located near the hinge axis between the second crank arm and the connecting rod.

[0008] The frame includes a second mounting plate, the gate spring is disposed on the back of the second mounting plate, the output crank arm is disposed on the front of the second mounting plate, and the second mounting plate is provided with a through hole for the first pivot to pass through.

[0009] A guide rod passes through the opening spring, and an opening spring seat is provided on one side of the fixed end of the opening spring. The opening spring seat is fixedly connected to the second mounting plate. The guide rod passes through the opening spring seat and is slidably engaged with the opening spring seat. A fifth hinge hole is provided at the lower end of the guide rod. The first pivot passes through the through hole and is inserted into the fifth hinge hole. The free end of the opening spring abuts against the first pivot.

[0010] The first pivot has a first hinge portion, a first convex ring portion, a second convex ring portion, and a second hinge portion in sequence along the axial direction. The first hinge portion is inserted into the fifth hinge hole, and the second hinge portion is inserted into the fourth hinge hole on the second crank arm. The through hole is an arc-shaped hole structure adapted to the outer diameter of the second convex ring portion. The first convex ring portion is located on the back of the second mounting plate and its outer diameter is larger than that of the second convex ring portion. The free end of the gate spring abuts against the first convex ring portion.

[0011] The frame includes a first mounting plate, a second mounting plate, and a third mounting plate arranged sequentially.

[0012] The second mounting plate and the third mounting plate are connected by a first connecting post. The first connecting post includes a stud that passes through and is fastened to the second mounting plate and the third mounting plate, and an abutment sleeve sleeved on the stud. The abutment sleeve is disposed between the second mounting plate and the third mounting plate and abuts against the second mounting plate and the third mounting plate at both ends.

[0013] The closing spring is disposed on the back of the second mounting plate, and the fixed end of the closing spring is connected to a second connecting post, which passes through and connects the second mounting plate and the third mounting plate.

[0014] A second roller is connected to the hinge shaft at the end of the second crank arm, which is hinged to the connecting rod, and a buffer is fitted below the second roller.

[0015] The beneficial effects of this utility model are as follows: This utility model places the opening spring in front, so that the free end of the opening spring cooperates with the output crank arm. When the closing spring releases energy to drive the closing, the driving energy is transmitted to the output shaft through the drive main shaft, the output crank arm, and the connecting rod in sequence to drive the closing. At the same time, it is also directly transmitted to the free end of the opening spring through the drive main shaft and the output crank arm, so that the opening spring stores energy. That is, the free end of the opening energy storage is located in the middle position of the closing spring energy release output transmission system, reducing energy loss. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of one embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the cooperative structure of the drive spindle, output crank arm, and stop spring in one embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure on the back of the second mounting plate in one embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the drive spindle, output crank arm, stop spring, connecting rod, output shaft, and mating structure in one embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the output crank arm in one embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the gate spring engagement structure in one embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of the first pivot in one embodiment of the present invention;

[0025] Figure 9 This is a cross-sectional view of the first connecting column in one embodiment of the present invention;

[0026] Figure 10 This is a cross-sectional view of the second connecting column in one embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0028] It should be noted that all uses of terms such as "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0029] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0030] like Figure 1 As shown, a circuit breaker mechanism includes a frame, a closing drive structure, a opening drive structure, an output shaft 8, an energy storage drive structure, a closing holding structure, and an opening holding structure. The closing drive structure includes a closing spring 4 and a closing drive transmission pair. When the closing spring 4 releases energy, it drives the output shaft 8 to rotate for closing through the closing drive transmission pair. The opening drive structure includes an opening spring 9 and an opening drive transmission pair. When the opening spring 9 releases energy, it drives the output shaft 8 to rotate for opening through the opening drive transmission pair.

[0031] Specifically, the frame includes a first mounting plate 1, a second mounting plate 2, a third mounting plate 3 arranged sequentially at intervals, and a connecting column connecting the first mounting plate 1, the second mounting plate 2, and the third mounting plate 3.

[0032] The closing spring 4 is disposed between the first mounting plate 1 and the second mounting plate 2. The closing drive transmission pair includes a drive main shaft 5, an output crank arm 6, a connecting rod 7, and an output shaft 8. The drive main shaft 5 passes through the second mounting plate 2 and the third mounting plate 3, as shown below. Figure 4 As shown, the portion of the drive spindle 5 located between the first mounting plate 1 and the second mounting plate 2 is fitted with a first cam 501 that is circumferentially linked. The fixed end of the closing spring 4, i.e., the upper end of the closing spring 4 in the figure, is fixedly connected to the second mounting plate 2 through the upper closing spring seat 401. The free end of the closing spring 4, i.e., the lower end of the closing spring 4 in the figure, is connected to the outer periphery of the first cam 501 through the lower closing spring seat 402, so that the extension and retraction of the closing spring 4 is linked with the rotation of the drive spindle 5. Figure 2 As shown, a second cam 502 with circumferential linkage is fitted around the outer periphery of the portion of the drive spindle 5 located between the second mounting plate 2 and the third mounting plate 3. Figure 6 As shown, the output crank arm 6 includes a central rotating shaft 606 and a first crank arm 601, a second crank arm 602, and a third crank arm 603 connected to the central rotating shaft 606. The first crank arm 601 has a first hinge hole 6011 at its end, and a first roller 604 is rotatably connected to the first hinge hole 6011. The second crank arm 602 has a second hinge hole 6021 at its end, and is hinged to the connecting rod 7 at the second hinge hole 6021. The connecting rod 7 is hinged to the output shaft 8 and drives the cam on the main shaft 5. The second cam 502 is in transmission cooperation with the first roller 604. That is, when the closing spring 4 releases energy and drives the main shaft 5 to rotate, the second cam 502 pushes the first roller 604, thereby driving the output crank arm 6 to rotate in the closing direction. The connecting rod 7 and the output shaft 8 are transmitted in sequence, causing the output shaft 8 to rotate and output the closing action. The third crank arm 603 has a third hinge hole 6031 at its end. The closing holding roller is hinged to the third hinge hole 6031 to lock the energy storage state of the opening spring 9, thereby keeping the circuit closed. When the circuit needs to be opened, the opening releases the locking effect on the closing holding roller.

[0033] The gate spring 9 is disposed between the first mounting plate 1 and the second mounting plate 2, such as Figure 3 , Figure 4 As shown, the fixed end of the opening spring 9, i.e., the upper end of the opening spring 9 in the figure, is fixedly connected to the second mounting plate 2 through the opening spring seat 901. The free end of the opening spring 9, i.e., the lower end of the opening spring 9 in the figure, is linked to the output crank arm 6 through the first pivot 10, so that the output crank arm 6 can rotate in the closing direction, which can drive the opening spring 9 to store energy. When the opening spring 9 releases energy, it drives the output crank arm 6 to rotate in the opening direction, thereby transmitting power through the connecting rod 7 and the output shaft 8 in sequence, causing the output shaft 8 to rotate and output the opening action. The energy storage process of the opening spring 9 is as follows: when the closing spring 4 releases energy and drives the output crank arm 6 to rotate in the closing direction, the free end of the opening spring 9 is driven to move through the first pivot 10, thereby realizing energy storage.

[0034] Furthermore, such as Figure 5 As shown, the first pivot 10 is located close to the hinge axis of the second crank arm 602 and the connecting rod 7, which makes the movement trajectory of the first pivot 10 longer, that is, the amount of movement of the free end of the opening spring 9 driven by the release of energy of the closing spring 4 is greater, which facilitates the energy storage of the opening spring 9.

[0035] Furthermore, such as Figure 7 As shown, a guide rod 902 passes through the opening spring 9. The opening spring seat 901 is fixedly connected to the second mounting plate 2 by threaded fasteners. The guide rod 902 passes through the opening spring seat 901 and is slidably engaged with the opening spring seat 901. The lower end of the guide rod 902 is provided with a fifth hinge hole 903. The second crank arm 602 is provided with a fourth hinge hole 6022. The second mounting plate 2 is provided with a through hole 201 for the first pivot 10 to pass through. The first pivot 10 passes through the through hole 201 on the second mounting plate 2 and its two ends are respectively inserted into the fourth hinge hole 6022 and the fifth hinge hole 903. The free end of the opening spring 9 abuts against the first pivot 10.

[0036] Furthermore, such as Figure 8 As shown, the first pivot 10 has, along its axial direction, a first hinge portion 1001, a first convex ring portion 1002, a second convex ring portion 1003, and a second hinge portion 1004. The first hinge portion 1001 is inserted into the fifth hinge hole 903, and the second hinge portion 1004 is inserted into the fourth hinge hole 6022 on the second crank arm. The through hole is an arc-shaped hole structure adapted to the outer diameter of the second convex ring portion 1003. The first convex ring portion 1002 is located on the back of the mounting plate and its outer diameter is larger than that of the second convex ring portion 1003. The free end of the brake spring abuts against the first convex ring portion 1002. This arrangement facilitates installation, and the axial position of the first pivot 10 can be fixed by the guide rod 902 and the output crank arm 6.

[0037] Compared to the existing technology, which uses a crank arm on the output shaft to drive the free end of the opening spring 9 to achieve energy storage, this embodiment places the engagement part of the opening spring 9 and the closing drive transmission pair in front, reducing the energy transmission stages of the closing spring 4 releasing energy to drive the opening spring 9 to store energy, thereby reducing energy transmission loss.

[0038] Furthermore, the structure of this embodiment does not change the overall layout of the existing structure that drives the opening spring 9 to store energy via the output shaft. It can be directly optimized on the existing circuit breaker mechanism that has the opening spring 9 driven by the output shaft to store energy at a lower cost, without increasing the volume of the existing circuit breaker mechanism.

[0039] Furthermore, such as Figure 5 As shown, a second roller 605 is connected to the hinge shaft at the end of the second crank arm 602, which is hinged to the connecting rod 7. A buffer 11 is fitted below the second roller 605 to reduce the rebound of the trip spring and overshoot, thereby improving the reliability and stability of the equipment.

[0040] like Figure 9 , Figure 10 As shown, the second mounting plate 2 and the third mounting plate 3 are connected by a first connecting post. The first connecting post includes a stud 1201 that passes through and secures the second mounting plate 2 and the third mounting plate 3, and an abutment sleeve 1202 sleeved on the stud 1201. The abutment sleeve 1202 is disposed between the second mounting plate 2 and the third mounting plate 3, and its two ends abut against the second mounting plate 2 and the third mounting plate 3. The closing spring is disposed on the back of the second mounting plate 2, and the fixed end of the closing spring is connected to the second connecting post 11, which passes through and connects the second mounting plate 2 and the third mounting plate 3. With the above configuration, the second mounting plate 2 and the third mounting plate 3 can be made relatively thin without affecting the overall strength.

[0041] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A circuit breaker pre-type opening spring mechanism, comprising a frame, a closing spring, a driving main shaft, an output crank, a connecting rod, an output shaft, an opening spring, a fixed end of the closing spring is fixedly connected with the frame and a free end is drivingly connected with the driving main shaft, the driving main shaft, the output crank, the connecting rod and the output shaft are sequentially drivingly matched, characterized in that: The fixed end of the opening spring is fixedly connected with the rack and the free end is connected with the output crank.

2. The circuit breaker pre-molded opening spring mechanism of claim 1, wherein: The output crank comprises a central rotating shaft, a first crank and a second crank connected with the central rotating shaft, a first roller rotatably connected with the end of the first crank, and a connecting rod hingedly connected with the end of the second crank and the output shaft.

3. The circuit breaker pre-molded opening spring mechanism of claim 2, wherein: The free end of the opening spring is connected with the second crank.

4. The circuit breaker pre-molded opening spring mechanism of claim 3, wherein: The free end of the opening spring is hingedly connected with the second crank through a first pivot, and the first pivot is arranged close to the hinging shaft of the second crank and the connecting rod.

5. The circuit breaker pre-molded opening spring mechanism of claim 4, wherein: The rack comprises a second mounting plate, the opening spring is arranged on the back of the second mounting plate, the output crank is arranged on the front of the second mounting plate, and the second mounting plate is provided with a through hole through which the first pivot passes.

6. The circuit breaker pre-molded opening spring mechanism of claim 5, wherein: The opening spring is provided with a guide rod, the opening spring seat is fixedly connected with the second mounting plate, the guide rod passes through the opening spring seat and is slidably connected with the opening spring seat, the lower end of the guide rod is provided with a fifth hinging hole, the first pivot passes through the through hole and is inserted into the fifth hinging hole, and the free end of the opening spring abuts against the first pivot.

7. The circuit breaker pre-molded opening spring mechanism of claim 6, wherein: The first pivot has a first hinging part, a first convex ring part, a second convex ring part and a second hinging part in sequence along the axial direction, the first hinging part is inserted into the fifth hinging hole, the second hinging part is inserted into a fourth hinging hole in the second crank, the through hole is an arc-shaped hole structure matched with the outer diameter of the second convex ring part, the first convex ring part is located on the back of the second mounting plate and has an outer diameter larger than that of the second convex ring part, and the free end of the opening spring abuts against the first convex ring part.

8. The circuit breaker pre-molded opening spring mechanism of claim 1, wherein: The rack comprises a first mounting plate, a second mounting plate and a third mounting plate arranged in sequence. The second mounting plate and the third mounting plate are connected through a first connecting column, the first connecting column comprises a stud passing through and fastening the second mounting plate and the third mounting plate and an abutting sleeve sleeved outside the stud, the abutting sleeve is arranged between the second mounting plate and the third mounting plate and abuts against the second mounting plate and the third mounting plate at both ends, The closing spring is arranged on the back of the second mounting plate, the fixed end of the closing spring is connected with the second connecting column which passes through and connects the second mounting plate and the third mounting plate.

9. The circuit breaker pre-type opening spring mechanism according to any one of claims 2-7, characterized in that: The second roller is connected with the hinging shaft at which the end of the second crank is hingedly connected with the connecting rod, and the buffer is matched with the second roller below.

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