A circuit breaker with a grounding switch

Abstract

The present invention relates to the field of high-voltage switches, and in particular to a circuit breaker with a grounding switch. The circuit breaker includes a circuit breaker frame, a main break structure, a main rotating shaft, a grounding switch module, and an energy storage assembly. The grounding switch module includes a static contact, a moving contact, and a grounding rotating shaft. The energy storage assembly includes a connecting frame and an energy storage spring. The grounding rotating shaft is arranged parallel to the main rotating shaft. A crank arm structure is provided on the grounding rotating shaft. One end of the connecting frame cooperates with the main rotating shaft and the other end cooperates with the crank arm structure. The connecting frame and the main rotating shaft form a rotating pair. One of the crank arm structure and the connecting frame is provided with a connecting long slot, and the other is fixed with a connecting pin, which is installed in the connecting long slot. The energy storage spring is installed on the connecting frame. When the crank arm structure rotates toward the main rotating shaft, the energy storage spring is compressed to store energy. When the crank arm structure rotates past the dead point position, the energy storage spring releases energy and pushes the crank arm structure to rotate. The circuit breaker is used to solve the problems of complex structure and large size of existing circuit breakers.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switches, and in particular to a circuit breaker with a grounding switch. Background Art

[0002] Circuit breakers with grounding switches are used in many switch cabinets for power systems. After the main break structure is opened, this type of circuit breaker can control the grounding switch to close and ground, thereby ensuring the personal safety of maintenance personnel.

[0003] Currently, circuit breakers with grounding switches are equipped with a grounding shaft for driving the movable contact in the grounding switch to rotate. An energy storage mechanism for storing energy is provided on the grounding shaft. One end of the energy storage mechanism rotates with the grounding shaft, and the other end rotates with a support frame installed on the circuit breaker frame. During the opening and closing strokes of the grounding switch, the energy storage mechanism starts to store energy in the first half of the rotation of the grounding shaft and releases energy in the second half, thereby prompting the grounding switch to close or open quickly, thereby reducing the operating difficulty for maintenance personnel.

[0004] In the above-mentioned circuit breaker with a grounding switch, one end of the energy storage mechanism is rotatably engaged with a support bracket mounted on the circuit breaker frame. Therefore, a dedicated support bracket needs to be provided on the circuit breaker frame, which results in a relatively complex structure and inconvenient processing and manufacturing. In addition, installation space for the support bracket needs to be reserved on the circuit breaker frame, and when arranging the support bracket, it must be considered that it does not interfere with the main rotating shaft of the circuit breaker. This results in a relatively complex structure and a large volume of the entire circuit breaker. Summary of the Invention

[0005] The object of the present invention is to provide a circuit breaker with a grounding switch, so as to solve the problems of the existing circuit breakers with a grounding switch being complex in structure and large in size.

[0006] To achieve the above objectives, the circuit breaker with grounding switch provided by the present invention adopts the following technical solutions:

[0007] The circuit breaker with grounding switch includes:

[0008] Circuit breaker frame;

[0009] The main breaking structure is assembled on the circuit breaker frame;

[0010] The main rotating shaft is assembled on the circuit breaker frame and is connected to the active contacts in the main breaker structure;

[0011] The grounding switch module is installed on the circuit breaker frame and includes a grounding static contact, a grounding movable contact and a grounding shaft. The grounding shaft is connected to the grounding movable contact and drives the grounding movable contact to perform opening and closing actions;

[0012] The grounding shaft is arranged parallel to the main shaft;

[0013] An energy storage assembly is installed between the grounded shaft and the main shaft;

[0014] A crank arm structure is provided on the grounding shaft. The energy storage assembly includes a connecting frame that cooperates with the main shaft at one end and cooperates with the crank arm structure at the other end. The connecting frame and the main shaft form a rotating pair. The rotation axis of the rotating pair is coaxial with the main shaft. A connecting long slot is provided on one of the crank arm structure and the connecting frame, and a connecting pin is fixed on the other. The connecting pin is installed in the connecting long slot. When the crank arm structure rotates with the grounding shaft, the connecting frame is driven to rotate.

[0015] The energy storage assembly also includes an energy storage spring, which is installed on the connecting frame. When the crank arm structure rotates toward the main rotating shaft, the energy storage spring is compressed to store energy. When the crank arm structure rotates past the dead point position, the energy storage spring releases energy and pushes the crank arm structure to rotate.

[0016] The beneficial effect of the circuit breaker with a grounding switch provided by the present invention is that the energy storage component in the circuit breaker is installed between the grounding shaft and the main shaft, and one end of the connecting frame of the energy storage component cooperates with the main shaft and the other end cooperates with the grounding shaft, without the need to provide a special support frame for supporting the energy storage component, which simplifies the structural complexity of the circuit breaker, reduces the difficulty of circuit breaker layout, and saves space for arranging the support frame, making the overall volume of the circuit breaker smaller.

[0017] Furthermore, the connecting frame includes a bone member, the energy storage spring is mounted on the bone member, one end of the bone member is provided with a rotational mating structure for forming a rotational pair with the main shaft, a connecting slot is provided on the bone member, and a connecting pin is mounted on the crank arm structure. This arrangement makes the crank arm structure relatively simple and reduces manufacturing costs.

[0018] Furthermore, the crank arm structure includes two axially spaced arm plates fixed to a grounded rotating shaft, with a connecting pin connected between the two arm plates. When the crank arm structure drives the connecting frame to rotate, the connecting pin presses against the energy storage spring to compress it. The connecting pin presses against the energy storage spring, which is more stable.

[0019] Furthermore, the energy storage spring is sleeved on the connecting frame. In this way, the connecting frame structure is relatively simple and has various forms, such as plate shape, rod shape, cylinder shape, etc.

[0020] Furthermore, the connecting frame includes a frame and an arc-shaped snap ring at one end of the frame, and the connecting frame cooperates with the main shaft through the arc-shaped snap ring to form a rotating pair. This type of connecting frame has a relatively simple structure and is easy to install the connecting frame and the main shaft.

[0021] Furthermore, the connecting frame is a plate structure, and the plate surface is arranged perpendicular to the main shaft, and the main shaft is provided with a limit structure for limiting the axial position of the arc-shaped clamping ring. The plate-shaped connecting frame is relatively simple and easy to process and manufacture.

[0022] Furthermore, the limiting structure is an annular groove provided on the main shaft, and the groove wall of the annular groove limits the arc-shaped retaining ring in the axial direction. This type of limiting structure is easy to implement.

[0023] Furthermore, the inner side of the arc-shaped snap ring is provided with a plurality of support protrusions spaced along its circumference, and the arc-shaped snap ring contacts the main shaft via the support protrusions. With the support protrusions, only the support protrusions on the inner side of the arc-shaped snap ring contact the main shaft, resulting in a smaller contact area and less friction during rotation. This not only reduces the difficulty of rotating the grounded shaft but also reduces the noise generated between the connecting frame and the main shaft.

[0024] Furthermore, there are two or more energy storage assemblies, which are spaced apart along the axial direction of the grounding shaft. This arrangement allows more energy to be stored in the energy storage assemblies after the grounding shaft rotates the same angle, further ensuring the reliability of the opening and closing operations of the grounding switch module.

[0025] Furthermore, the energy storage assembly is equipped with two spring pressure plates, which are mounted on the connecting frame and located at both ends of the energy storage spring. The spring pressure plates can fully cover the ends of the energy storage spring, ensuring that the energy storage spring does not deflect during the compression process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic structural diagram of an embodiment of a circuit breaker with a grounding switch provided by the present invention;

[0027] Figure 2 1 is a schematic diagram of the connection between the main rotating shaft, the grounding rotating shaft and the energy storage assembly in an embodiment of a circuit breaker with a grounding switch provided by the present invention;

[0028] Figure 3 1 is a schematic structural diagram of a connection plate in an embodiment of a circuit breaker with a grounding switch provided by the present invention;

[0029] Figure 4 1 is a schematic structural diagram of a main rotating shaft in an embodiment of a circuit breaker with a grounding switch provided by the present invention;

[0030] Figure 5 It is a structural schematic diagram of a spring pressure plate in an embodiment of a circuit breaker with a grounding switch provided by the present invention.

[0031] In the accompanying drawings: 1-circuit breaker frame, 2-main fracture structure, 3-main rotating shaft, 4-grounding rotating shaft, 5-grounding moving contact, 6-grounding static contact, 7-crank arm structure, 8-energy storage assembly, 9-stop shaft, 10-opening stop protrusion, 11-closing stop protrusion, 12-arm plate, 13-connecting pin, 14-connecting plate, 15-energy storage spring, 16-spring pressure plate, 17-main board, 18-connecting long groove, 19-arc-shaped retaining ring, 20-support protrusion, 21-ring groove, 22-through hole. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0033] Embodiments of the circuit breaker with grounding switch provided by the present invention:

[0034] like Figure 1 As shown, the circuit breaker includes a circuit breaker frame 1, which serves as the installation base of the entire circuit breaker. The main fracture structure 2 and main shaft 3 of the circuit breaker are installed therein. The main shaft 3 rotates with the circuit breaker frame 1 and is connected to the active contacts in the main fracture structure 2. The main shaft 3 drives the active contacts to perform opening and closing actions.

[0035] like Figure 1 As shown, a grounding switch module is also installed in the circuit breaker frame 1. The grounding switch module includes a grounding shaft 4 that rotates with the circuit breaker frame 1, a grounding movable contact 5 that is transmission-connected to the grounding shaft 4, and a grounding static contact 6 fixed in the circuit breaker frame 1. The grounding shaft 4 is arranged parallel to the main shaft 3. In this embodiment, in order to improve the structural compactness of the entire circuit breaker, the grounding static contact 6 is integrated with the main disconnect structure 2. The grounding shaft 4 drives the grounding movable contact 5 to perform opening and closing operations.

[0036] like Figure 1 and Figure 2 As shown, two energy storage assemblies 8 are installed between the main rotating shaft 3 and the ground rotating shaft 4, spaced apart along the axial direction of the main rotating shaft 3. The energy storage assemblies 8 include a connecting plate 14, an energy storage spring 15 mounted on the connecting plate 14, and two spring pressure plates 16 mounted on the connecting plate 14 and located at both axial ends of the energy storage spring 15 (only the spring pressure plate 16 facing the ground rotating shaft 4 is shown in the figure). The connecting plate 14 constitutes the connecting framework of the energy storage assembly 8, and the plate surface of the connecting plate 14 is perpendicular to the axial direction of the main rotating shaft 3.

[0037] like Figures 1-4As shown, the connecting plate 14 includes a main body 17, and an arc-shaped snap ring 19 is provided at one end of the main body 17 in the longitudinal direction. The energy storage spring 15 is sleeved on the main body 17, and a ring groove 21 is provided on the main shaft 3 corresponding to the arc-shaped snap ring 19. The arc-shaped snap ring 19 is sleeved in the ring groove 21 of the main shaft 3, which can not only realize the rotation cooperation with the main shaft 3, but also the groove wall of the ring groove 21 can limit the arc-shaped snap ring 19 along the axial direction of the main shaft 3, thereby preventing the connecting plate 14 from moving and connecting in the axial direction of the main shaft 3. The deflection of the plate 14; in order to reduce the friction of the arc-shaped snap ring 19 when it rotates relative to the main shaft 3, three supporting protrusions 20 are provided on the inner side surface of the arc-shaped snap ring 19 along its circumference. The three supporting protrusions 20 are evenly distributed along the circumference of the arc-shaped snap ring 19. With this arrangement, only the supporting protrusions 20 on the inner side of the arc-shaped snap ring 19 are in contact with the bottom of the annular groove 21 on the main shaft 3, which greatly reduces the friction between the arc-shaped snap ring 19 and the main shaft 3; the connecting plate 14 constitutes a connecting skeleton, and the main board body 17 constitutes a bone member in the connecting skeleton.

[0038] like Figures 1-4 As shown, a groove is provided on the main body 17 of the connecting plate 14 at one end facing the grounding shaft 4, starting from its end along its length direction, and the groove forms a connecting long groove 18 on the connecting plate 14, and the connecting long groove 18 penetrates the main body 17 along the thickness direction of the main body 17; a crank arm structure 7 is provided on the grounding shaft 4 corresponding to the energy storage component 8, and the crank arm structure 7 includes two arm plates 12 arranged at intervals along the axial direction of the grounding shaft 4, and the two arm plates 12 are fixed to the grounding shaft 4, and a connecting pin 13 is fixed between the two arm plates 12, and the axis of the connecting pin 13 extends along the axial direction of the grounding shaft 4; the grounding shaft 4 is connected to the connecting long groove 18 of the connecting plate 14 by the connecting pin 13.

[0039] During the rotation of the grounding shaft 4, because the connecting pin 13 extends into the connecting long groove 18 of the connecting plate 14, the connecting pin 13 will also push the connecting plate 14 to rotate around the main rotating shaft 3 during the rotation with the grounding shaft 4. Because the connecting pin 13 is installed on the crank arm structure 7, the connecting pin 13 will be guided and moved relative to the connecting plate 14 in the connecting long groove 18 during the rotation with the grounding shaft 4, and gradually compress the energy storage spring 15; the connecting plate 14 and the main rotating shaft 3 constitute a rotating pair, and the rotation axis of the rotating pair is collinear with the axis of the main rotating shaft 3.

[0040] like Figure 2 and Figure 5As shown, the spring pressure plate 16 is a circular structure with a through hole 22 in the middle for the main body 17 to pass through. The spring pressure plates 16 are arranged at both ends of the energy storage spring 15. The spring pressure plate 16 close to the arc-shaped snap ring 19 is stopped by the arc-shaped snap ring 19 to form a stopping structure for the energy storage spring 15. The spring pressure plate 16 close to the side of the grounding shaft 4 is pushed by the connecting pin 13 to compress the energy storage spring 15. The two spring pressure plates 16 are provided so that both ends of the energy storage spring 15 can be fully covered during the compression process, thereby ensuring that the energy storage spring 15 will not be skewed during the compression process and is relatively stable.

[0041] like Figure 1 As shown, a stop disk is fixed at one end of the grounding shaft 4, and the stop disk is close to the circuit breaker frame 1 at the corresponding end of the grounding shaft 4. A stopping shaft 9 is provided on the circuit breaker frame 1, and the stop disk is provided with an opening stop protrusion 10 and a closing stop protrusion 11 which can stop the stopping shaft 9 respectively during the rotation of the grounding shaft 4. During the closing process of the grounding switch module, when the closing stop protrusion 11 stops with the stopping shaft 9, it represents that the grounding switch module is closed successfully, and when the opening stop protrusion 10 stops with the stopping shaft 9, it represents that the grounding switch module is opened successfully.

[0042] When the circuit breaker is in use, after the main fault structure 2 is opened, the grounding switch module needs to be closed to achieve grounding of the circuit breaker. The maintenance personnel rotate the grounding shaft 4 to rotate the grounding movable contact 5 toward the grounding static contact 6. During the rotation process, when the energy storage spring 15 reaches the maximum compression amount (at this time, the axes of the main shaft 3, the grounding shaft 4 and the connecting pin 13 are coplanar), the crank arm structure 7 and the energy storage assembly 8 move to the dead point position of the two. Then the maintenance personnel continue to rotate the grounding shaft 4. After passing the dead point position, the energy storage spring 15 releases energy, pushing the grounding shaft 4 through the spring pressure plate 16, the connecting pin 13 and the crank arm structure 7. Continue to rotate until the closing stop protrusion 11 on the stop disk on the grounding shaft 4 is stopped by the stop shaft 9, at which time the grounding switch module is closed; when the grounding switch module needs to be opened, the maintenance personnel rotate the grounding shaft 4 in the opposite direction to rotate the grounding moving contact 5 back to the grounding static contact 6. During the rotation process, when passing the dead point position, the energy storage spring 15 reaches the maximum compression amount, and then after passing the dead point position, the energy storage spring 15 releases energy, pushing the grounding shaft 4 to continue rotating until the opening stop protrusion 10 on the stop disk on the grounding shaft 4 is stopped by the stop shaft 9, at which time the grounding switch module is opened.

[0043] In the above embodiment, the connecting long slot is provided on the connecting frame, and the connecting pin is provided on the crank arm structure. During the rotation of the grounding shaft, the connecting pin compresses the energy storage spring. In other embodiments, the connecting long slot can also be provided on the crank arm structure, and the connecting pin is fixed on the connecting frame. Similarly, the connecting frame can be driven to rotate during the rotation of the crank arm structure with the grounding shaft. In addition, it is necessary to provide an avoidance long slot on the connecting frame for the crank arm structure to extend into. The avoidance long slot extends along the length direction of the connecting frame. During the rotation of the crank arm structure with the grounding shaft, the top of the crank arm structure can press the energy storage spring, thereby realizing energy storage of the energy storage assembly. In this case, the connecting frame can be a plate or rod-shaped structure, and the corresponding energy storage spring is sleeved on the connecting frame. The connecting frame can also be a tubular structure, and the corresponding energy storage spring is inserted into the inner cavity of the tubular structure.

[0044] In the above embodiment, the connecting skeleton is a connecting plate, the energy storage spring is mounted on the connecting plate, the end of the connecting plate close to the main shaft forms an arc-shaped snap ring, the arc-shaped snap ring is clamped in the annular groove of the main shaft, and the annular groove constitutes a limiting structure on the main shaft. In other embodiments, the connecting skeleton may also be other structures, such as two rod-shaped structures, which are fixedly connected together, and an arc-shaped snap ring structure is formed at one end of the connecting skeleton through the shape of the rod-shaped structure, and the connecting long groove at the other end is composed of the spacing space between the two rod-shaped structures. The energy storage spring is sleeved on the outside of the connecting skeleton, which can also be used, or the connecting skeleton may also be a tubular structure, and an arc-shaped snap ring structure is cut at the end of the tubular structure close to the main rotating shaft, and a connecting long groove is opened at the end of the tubular structure close to the grounding rotating shaft, and the energy storage spring is inserted into the inner cavity of the tubular structure, which can also be used; the end of the connecting plate close to the main rotating shaft may not be an arc-shaped snap ring, but may be a sleeve structure. In this case, there is no need to set a ring groove on the main rotating shaft, and the sleeve structure itself can prevent the connecting plate from deflecting; the limiting structure may also be other structural forms, such as several limiting protrusions may be set on the main rotating shaft, and several limiting protrusions are set on both sides of the arc-shaped snap ring, thereby limiting and supporting the arc-shaped snap ring.

[0045] In the above embodiment, the grounding static contact is integrated with the main breaker structure. In other embodiments, the grounding static contact can also be fixed separately in the circuit breaker frame, such as providing a dedicated fixing bracket, and the grounding static contact is fixed on the fixing bracket, which can also be used.

[0046] In the above embodiment, two energy storage assemblies are provided. In other embodiments, one, three, or more energy storage assemblies may be provided. When only one energy storage assembly is provided, it is best to arrange it in the middle of the grounded shaft. When other numbers of energy storage assemblies are provided, they are also best arranged evenly relative to the grounded shaft.

[0047] In the above embodiment, the crank arm structure includes two arm plates arranged at intervals, and the connecting pin is fixed between the two arm plates. In other embodiments, the crank arm structure can also have only one arm plate, with one end of the connecting pin fixed to the arm plate and the other end cantilevered, which can also be used.

Claims

1. A circuit breaker with a grounding switch, comprising: Circuit breaker frame; The main breaking structure is assembled on the circuit breaker frame; The main rotating shaft is assembled on the circuit breaker frame and is connected to the active contacts in the main breaker structure; The grounding switch module is installed on the circuit breaker frame and includes a grounding static contact, a grounding movable contact and a grounding shaft. The grounding shaft is connected to the grounding movable contact and drives the grounding movable contact to perform opening and closing actions; Its characteristics are: The grounding shaft is arranged parallel to the main shaft; The energy storage assembly is installed between the grounding shaft and the main shaft, and includes a connecting plate, an energy storage spring sleeved on the connecting plate, and two spring pressure plates sleeved on the connecting plate and located at both axial ends of the energy storage spring; The connecting plate includes a main body, one end of which is provided with an arc-shaped snap ring in the longitudinal direction of the main body, and the other end is provided with a connecting long groove along the longitudinal direction thereof from the end thereof. The energy storage spring is sleeved on the main body, and a ring groove is provided on the main shaft corresponding to the arc-shaped snap ring. The arc-shaped snap ring is sleeved in the ring groove of the main shaft, and the groove wall of the ring groove limits the arc-shaped snap ring in the axial direction. A crank arm structure is provided on the ground rotating shaft, and a connecting pin is fixed on the crank arm structure. The connecting pin is installed in the connecting long slot, and drives the connecting frame to rotate when the crank arm structure rotates with the ground rotating shaft; when the crank arm structure rotates toward the main rotating shaft, the energy storage spring is compressed to store energy, and when the crank arm structure rotates past the dead point position, the energy storage spring releases energy and pushes the crank arm structure to rotate.

2. The circuit breaker with a grounding switch according to claim 1, wherein: The crank arm structure includes two axially spaced arm plates fixed on the grounded rotating shaft, and a connecting pin is connected between the two arm plates. When the crank arm structure drives the connecting frame to rotate, the connecting pin presses the energy storage spring to compress it.

3. The circuit breaker with a grounding switch according to claim 1, wherein: The connecting frame is a plate structure, and the plate surface is arranged perpendicular to the main rotating shaft.

4. The circuit breaker with a grounding switch according to claim 1 or 3, characterized in that: A plurality of supporting protrusions are provided on the inner side surface of the arc-shaped clamping ring at intervals along the circumference thereof, and the arc-shaped clamping ring contacts the main rotating shaft through the supporting protrusions.

5. The circuit breaker with a grounding switch according to claim 1, 2 or 3, characterized in that: There are more than two energy storage components, which are arranged at intervals along the axial direction of the grounded rotating shaft.

6. The circuit breaker with a grounding switch according to claim 1, 2 or 3, characterized in that: Two spring pressure plates are installed on the connecting frame.

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