Ring main unit and circuit breaker mechanism thereof

Abstract

The utility model relates to ring main unit and circuit breaker mechanism thereof. Circuit breaker mechanism is installed in ring main unit, and ring main unit has front side and back side in width direction. Circuit breaker mechanism includes front plate, middle plate and back plate arranged in order from front to back, still includes: energy storage motor is detachably installed in front plate, motor output shaft is set through front plate and middle plate and is connected to energy storage motor directly, energy storage shaft is set through front plate and middle plate and is spaced apart with motor output shaft, transmission mechanism is connected between motor output shaft and energy storage shaft, energy storage indicating part is jointed in the front end of energy storage shaft and stretches out front plate, energy storage spring is arranged between middle plate and back plate, and one end is connected to the back end of energy storage shaft and stretches out middle plate, and the other end is connected to short shaft fixed between middle plate and back plate.

Description

Technical Field

[0001] This utility model relates to the field of operating mechanisms for power distribution systems, and more particularly to ring main units and their circuit breaker mechanisms. Background Technology

[0002] Ring main units (RNBs) are critical switching devices used for ring network connections, load distribution, and fault isolation in power distribution networks. With the increasing global emphasis on environmental protection and low-carbon practices, the RNB market is gradually shifting from traditional SF6 gas insulation to environmentally friendly insulation technologies. New environmentally friendly RNBs primarily employ dry air / nitrogen and other environmentally friendly gas insulation solutions, and their core breaking components are equipped with environmentally friendly vacuum circuit breakers to meet environmental requirements and ensure reliable breaking capacity.

[0003] At the same time, the market has demanded further miniaturization of ring main units, such as reducing the cabinet width to 350 mm. This compact design is crucial for several reasons: it not only addresses the stringent space constraints faced by customers in retrofitting older substations, but also significantly improves the product's transport and installation adaptability, making it particularly suitable for confined spaces. Furthermore, it effectively reduces material costs and enhances functional integration to strengthen market competitiveness. Achieving this 350 mm cabinet width target hinges on optimizing the mechanism's transmission layout design, ensuring that miniaturization is achieved while meeting all functional requirements and safety standards. Utility Model Content

[0004] The present invention aims to provide a circuit breaker mechanism that can at least solve some of the above-mentioned technical problems.

[0005] This utility model also aims to provide a ring main unit that applies the above-mentioned improved circuit breaker mechanism.

[0006] According to one aspect of the present invention, a circuit breaker mechanism is provided, the circuit breaker mechanism being installed in a ring main unit, the ring main unit having a front side and a rear side in the width direction, the circuit breaker mechanism comprising a front plate, a middle plate and a rear plate arranged sequentially from front to back, the circuit breaker mechanism comprising: an energy storage motor detachably mounted on the front plate; a motor output shaft passing through the front plate and the middle plate and directly connected to the energy storage motor; an energy storage shaft passing through the front plate and the middle plate and spaced apart from the motor output shaft; a transmission mechanism connected between the motor output shaft and the energy storage shaft; an energy storage indicator engaging with the front end of the energy storage shaft extending forward from the front plate; and an energy storage spring arranged between the middle plate and the rear plate, one end of which is controlled to be connected to the rear end of the energy storage shaft extending backward from the middle plate, and the other end connected to a short shaft fixed between the middle plate and the rear plate.

[0007] The circuit breaker mechanism provided in this solution adopts a three-dimensional layered layout of front-middle-rear plates, placing the energy storage motor at the front, the drive shaft in the middle, and the spring at the rear. Combined with the parallel penetration of the motor output shaft and energy storage shaft through the front and middle plates, this reduces the longitudinal space of the circuit breaker mechanism, enabling reliable installation within a 350mm wide ring main unit. The three-plate layered layout also allows most, if not all, of the secondary electrical components in the circuit breaker mechanism to be arranged on the front plate, enabling modular assembly, facilitating intuitive user operation, and simplifying the replacement and maintenance of secondary electrical components. Furthermore, the three-plate layered layout makes the stress distribution of the entire circuit breaker mechanism more rational, allowing for component installation in both internal and external directions as well as along its length, resulting in more reliable operation and a longer service life. The direct connection design between the energy storage motor and the motor output shaft eliminates traditional intermediate transmission links such as clutches, significantly reducing intermediate transmission components in the circuit breaker mechanism and thus significantly reducing mechanical wear, jamming risk, and failure rate. In addition, the direct connection between the energy storage motor and the motor output shaft effectively improves energy conversion efficiency and shortens the spring energy storage time. The modular, detachable motor facilitates manual closing operations and simplifies maintenance procedures.

[0008] In some embodiments, the circuit breaker mechanism includes an auxiliary switch mounted to the front surface of the front panel, the auxiliary switch being electrically connected to a micro switch mounted on the front panel and capable of emitting an electrical signal in response to rotation of the energy storage shaft into position.

[0009] In some embodiments, the energy storage indicator is an integrally molded part, comprising: a sleeve portion, which is sleeved on the front end of the energy storage shaft and has an integral cam portion extending in a circumferential direction, the cam portion triggering the micro switch to emit an electrical signal when the energy storage shaft is rotated into position; and an indicator portion, which is formed at the end of the sleeve portion away from the front plate.

[0010] In some embodiments, the circuit breaker mechanism includes: a tripping output shaft pivotally disposed through the front plate and the middle plate; a tripping indicator connected to the forward-extending front end of the tripping output shaft on the front plate; a counter mounted on the front plate and adjacent to the tripping output shaft; and a spring operatively connected between the tripping indicator and the counter.

[0011] In some embodiments, the opening / closing indicator is an integrally formed part, comprising: a sleeve portion sleeved on the front end of the opening / closing output shaft; an indicator portion formed at the end of the sleeve portion away from the front plate; and a crank arm integrally extending from the sleeve portion and having a through hole for mounting one end of the spring.

[0012] In some embodiments, the counter includes: a housing mounted on the front panel; and a crank arm integrally extending from the housing and having a through hole for mounting the other end of the spring.

[0013] In some embodiments, the circuit breaker mechanism includes a closing mechanism located above the opening and closing output shaft. The closing mechanism includes: a closing operating member mounted on the front plate and having a movable closing operating end; a closing half-shaft pivotally passing through the front plate and the middle plate; a closing top plate sleeved on the end of the closing half-shaft; and a closing trip unit vertically mounted on the forward-facing surface of the front plate. The closing top plate can be driven by the movable closing operating end to approach and trigger the closing trip unit.

[0014] In some embodiments, the circuit breaker mechanism includes a tripping mechanism located below the tripping and closing output shaft. The tripping mechanism includes: a tripping operating member mounted on the front plate and having a movable tripping operating end; a tripping half-shaft pivotally passing through the front plate and the middle plate; a tripping top plate sleeved on the end of the tripping half-shaft; and a tripping trip unit mounted laterally on the forward-facing surface of the front plate. The tripping top plate can be driven by the movable tripping operating end to approach and trigger the tripping trip unit.

[0015] According to another aspect of the present invention, a ring main unit is provided, comprising a cabinet and a circuit breaker mechanism installed in the cabinet, characterized in that the circuit breaker mechanism is the aforementioned circuit breaker mechanism.

[0016] In some embodiments, the width of the cabinet is 350 mm.

[0017] Other features and advantages of this invention will partly be apparent to those skilled in the art upon reading this application, and partly will be described below in conjunction with the accompanying drawings in the detailed description. Attached Figure Description

[0018] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of a circuit breaker mechanism from one angle according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the circuit breaker mechanism according to an embodiment of the present invention from another angle;

[0021] Figure 3 This is a front view of a circuit breaker mechanism according to an embodiment of the present invention;

[0022] Figure 4 This is a side view of a circuit breaker mechanism according to an embodiment of the present invention;

[0023] Figure 5This is a schematic diagram of the energy storage indicator of the circuit breaker mechanism and the micro switch according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the opening and closing indication mechanism of the circuit breaker mechanism according to an embodiment of the present utility model.

[0025] Explanation of reference numerals in the attached figures

[0026] 1-Circuit breaker mechanism; 11-Front panel; 12-Middle panel; 13-Rear panel; 14-First compartment; 15-Second compartment; 2-Closing mechanism; 21-Closing operating component; 22-Closing half-shaft; 23-Closing top plate; 24-Closing trip unit; 3-Triggering mechanism; 31-Triggering operating component; 32-Triggering half-shaft; 33-Triggering top plate; 34-Triggering trip unit; 4-Energy storage mechanism; 41-Manual operating terminal; 42-Energy storage motor; 43-Motor Output shaft; 44-Energy storage shaft; 45-First gear; 46-Second gear; 47-Energy storage indicator; 471-Sleeve part; 472-Indicator part; 473-Cam part; 48-Micro switch; 49-Energy storage spring; 5-Auxiliary switch; 6-Opening / closing indicator mechanism; 61-Opening / closing indicator; 611-Sleeve part; 612-Crank arm; 613-Indicator part; 62-Counter; 621-Crank arm; 63-Spring; 7-Opening / closing output shaft Detailed Implementation

[0027] The schematic solutions of the technical solutions disclosed in this utility model are now described in detail with reference to the accompanying drawings. Although the drawings are provided to illustrate some embodiments of this utility model, the drawings are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of this utility model. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0028] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0029] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0030] exist Figures 1 to 4The diagram exemplarily illustrates a circuit breaker mechanism 1 according to the present invention. This mechanism belongs to the category of circuit breaker operating mechanisms and can drive a downstream circuit breaker (such as a vacuum circuit breaker) to open and close under normal circuit conditions. It can also drive the downstream circuit breaker to open within a specified time under abnormal circuit conditions and can drive the downstream circuit breaker to close after the circuit returns to normal. The circuit breaker mechanism 1 has a compact structure, particularly with optimized dimensions in the depth direction, and therefore can be well adapted to ring main units with narrow cabinet widths. In one embodiment, the ring main unit has a cabinet width of 350 mm.

[0031] To better illustrate the spatial positions and relative interactions of the functional components of the circuit breaker mechanism 1 of this invention, the longitudinal direction of the circuit breaker mechanism 1 is defined as the length direction and marked with "X" in the figure; the depth direction of the circuit breaker mechanism 1 is defined as the width direction and marked with "Y" in the figure; and the vertical direction of the circuit breaker mechanism 1 is defined as the height direction and marked with "Z" in the figure. Here, the depth direction or Y direction of the circuit breaker mechanism 1 corresponds to the width direction (cabinet width) of the ring main unit. As is well known, the ring main unit has a front side facing the operator and a rear side facing away from the operator in the width direction. In this invention... Figures 1 to 4 The reference frame is indicated by three or two of the above directions. It should be noted that the above reference frames are only for the purpose of enabling those skilled in the art to understand the present invention more clearly and intuitively, and are not intended to limit the scope of protection of the present invention, nor should they be construed as limiting the scope of protection of the present invention.

[0032] like Figures 1 to 4 As shown, the circuit breaker mechanism 1 includes a front plate 11, a middle plate 12, and a rear plate 13 arranged parallel and spaced apart from front to back along the longitudinal direction Y. A first compartment 14 is defined between the front plate 11 and the middle plate 12, and a second compartment 15 is defined between the middle plate 12 and the rear plate 13. Here, "front" and "rear" correspond to the front and rear sides of the ring main unit, respectively. The front plate 11, middle plate 12, and rear plate 13 are made of metal plates, preferably aluminum alloy plates, and are punched to form openings for mounting the various functional components of the circuit breaker mechanism 1. The front plate 11 and the middle plate 12, and the middle plate 12 and the rear plate 13, can be fixedly connected to each other by means of multiple fasteners.

[0033] The closing mechanism 2, opening mechanism 3, energy storage mechanism 4, and opening / closing indication mechanism 6 of the circuit breaker mechanism 1, as well as the output mechanism for operating the downstream circuit breaker connected to the circuit breaker mechanism 1, are respectively installed in a multi-layered space constructed by the front, middle, and rear plates. Most or even all secondary electrical components, such as motors, auxiliary switches, and trip units, can be integrated and arranged on the front plate 11. Integrating most or all secondary electrical components on the front plate enables modular assembly of the circuit breaker mechanism 1, making user operation more intuitive and facilitating the replacement and maintenance of secondary electrical components. Furthermore, the multi-layered space constructed by the three plates is beneficial for optimizing the layout and improving the stress distribution of the various functional components of the circuit breaker mechanism 1, because functional components can be installed in both the internal and external directions as well as along the length, making the circuit breaker mechanism 1 more reliable and extending its service life.

[0034] The energy storage mechanism 4 can be arranged in the upper right area of ​​the front plate 11. In the illustrated embodiment, the energy storage mechanism 4 is a manual-electric energy storage mechanism. The energy storage motor 42 is mounted on the front plate 11 and extends rearward, thus achieving front-mounted motor. The energy storage motor 42 can be detachably mounted on the front plate 11 using bolts or other connecting parts for easy maintenance. The output shaft of the energy storage motor 42, or motor output shaft 43, is parallel to the energy storage motor 42 and passes through the first compartment 14. The front end of the motor output shaft 43 extends forward from the front plate 11, and the rear end is mounted on the middle plate 12. The motor output shaft 43 is directly connected to the energy storage motor 42 and can pivot about its own central axis under the drive of the energy storage motor 42. The intermediate transmission links such as the traditional clutch mechanism are eliminated between the motor output shaft 43 and the energy storage motor 42, which can greatly reduce the intermediate transmission components of the circuit breaker mechanism, thereby significantly reducing mechanical wear, jamming risk and failure rate. In addition, the direct connection between the energy storage motor 42 and the motor output shaft 43 can effectively improve energy conversion efficiency and shorten the spring energy storage time.

[0035] A first gear 45 is fitted onto the motor output shaft 43. This first gear 45 is located within the first compartment 14 and near the rear end of the motor output shaft 43. The pivoting of the motor output shaft 43, driven by the energy storage motor 42, drives the first gear 45 to rotate synchronously. An energy storage shaft 44, parallel to and spaced apart from the motor output shaft 43, is also located within the first compartment 14. This energy storage shaft is located below the motor output shaft 43 and can pivot around its own central axis. The front end of the energy storage shaft 44 extends forward beyond the front plate 11, and the rear end extends backward beyond the middle plate 12 and enters the second compartment 15. A second gear 46 is fitted onto the energy storage shaft 44 and located within the first compartment 14. The diameter of the second gear 46 is significantly larger than that of the first gear 45; therefore, the second gear 46 can also be called a large gear, while the first gear 45 can be called a small gear. The first gear 45 meshes with the second gear 46, so that the rotation of the first gear 45 driven by the motor output shaft 43 drives the second gear 46 to rotate, further driving the pivoting of the energy storage shaft 44.

[0036] A crank arm is connected to the rear end of the energy storage shaft 44, and this crank arm can move synchronously with the pivoting of the energy storage shaft 44. One end of the energy storage spring 49 is connected to the crank arm, and the other end is connected to a short shaft fixed in the second compartment 15. This short shaft can be, for example, a fastener that fixes the middle plate 12 and the rear plate 13. In this way, when the energy storage shaft 44 is driven by the energy storage motor 42 to pivot in the energy storage direction, the energy storage spring 49 can be deformed (e.g., stretched) by the crank arm to accumulate elastic potential energy. An energy storage indicator 47 is connected to the front end of the energy storage shaft 44 extending out of the front plate 11. The energy storage indicator 47 rotates synchronously with the rotation of the energy storage shaft 44, transmitting information to the user whether the circuit breaker mechanism 1 is in an energy storage state.

[0037] like Figure 5 As exemplarily shown, the energy storage indicator 47 can be a one-piece molded part, including a sleeve portion 471 and an indicator portion 472 formed at one end of the sleeve portion 471. The sleeve portion 471 is sleeved on the front end of the energy storage shaft 44 and secured by a removable pin. The indicator portion 472 expands radially relative to the sleeve portion 471 to form an indicator plate, on the surface of which text or color markings can be provided to clearly indicate energy storage and non-energy storage information. The sleeve portion 471 can also be constructed with an integral cam portion 473 along its outer circumference via a cam profile. The cam portion extends continuously along the circumference of the sleeve portion 471, but does not surround the entire circumference of the sleeve portion 471, so that the cam portion 473 has two opposite ends circumferentially opposite to the sleeve portion 471. One end of the cam portion 473 is smoothly transitioned to the sleeve portion 471, while the other end protrudes from the sleeve portion 471 to form a stepped structure.

[0038] A microswitch 48 is installed near the energy storage shaft 44 on the front panel 11. When the energy storage shaft 44 rotates to its position in the energy storage direction, the stepped structure of the cam portion 473 triggers the microswitch 48, thereby enabling the microswitch 48 to emit an electrical signal indicating that energy storage is complete. The auxiliary switch 5, which is installed on the lower right side of the front surface of the front panel 11, receives the electrical signal from the microswitch 48. The auxiliary switch 5 can form an interlocking mechanism by being electrically connected to the microswitch 48. The microswitch 48 can only be triggered and emit an electrical signal when the energy storage shaft 44 rotates to its position in the energy storage direction, and the circuit breaker mechanism 1 can only control the downstream circuit breaker to perform a closing operation after the auxiliary switch 48 receives the electrical signal from the microswitch 48.

[0039] In addition to being driven by the energy storage motor 42, the energy storage shaft 44 can also be manually driven by the user. For this purpose, a manual operating end 41 or adapter can be provided at the front end of the motor output shaft 43 extending from the front plate 11. The user can connect to this manual operating end 41 using a tool to rotate the energy storage shaft 44. Since electric and manual operation are optional, the energy storage motor 42 can be removed before manually operating the energy storage shaft 44. As mentioned earlier, the energy storage motor 42, which is mounted to the front plate 11 via a detachable connector such as bolts, facilitates this operation.

[0040] The opening and closing output shaft 7 is disposed within the first compartment 14 and parallel to the energy storage shaft 44. The front end of the opening and closing output shaft 7 extends forward from the front plate 11, and the rear end extends backward from the middle plate 12, located within the second compartment 15. In the illustrated embodiment, the opening and closing output shaft 7 is positioned approximately centered on the left side of the front plate 11. The position of the opening and closing output shaft 7 can serve as a reference for arranging functional components of the circuit breaker mechanism 1, such as the energy storage mechanism 4, the opening mechanism 3, and the closing mechanism 2. Arranging these functional components around the opening and closing output shaft 7 makes the circuit breaker mechanism 1 more compact and better suited to a 350mm wide ring main unit. The opening and closing output shaft 7 can be driven to the downstream circuit breaker via an intermediate transmission mechanism such as a connecting rod, or it can be connected to an opening energy storage mechanism; existing technologies can be used for this part, which will not be elaborated here.

[0041] After the energy storage shaft 44 is rotated and energy storage is completed by the energy storage motor 42 or manual operation as described above, the energy storage shaft 44 can be constrained in the energy-stored position by the holding mechanism. Then, the closing operation can be completed based on the user's operation or control signal. For this purpose, a closing mechanism 2 is arranged on the upper left side of the front plate 11. The closing mechanism 2 basically includes a closing operating member 21, a closing half shaft 22, a closing top plate 23, and a closing trip unit 24. The closing trip unit 24 can be, for example, an electromagnetic trip unit, which is arranged vertically above the opening and closing output shaft 7. The closing top plate 23, which cooperates with the closing trip unit 24, is sleeved on the closing half shaft 22, and the closing half shaft 22 is pivotally connected between the front plate 11 and the middle plate 12. The front end of the closing half shaft 22 extends forward out of the front plate 11 and passes through the central sleeve hole of the closing top plate 23. Two slender rods extend at an angle from the central sleeve hole of the closing top plate 23, with the first slender rod located below the closing trip unit 24. The closing operation component 21 can be a closing button mounted on the front plate 11. When the closing button is pressed, it abuts against the second slender rod of the closing top plate 23, thereby driving the closing top plate 23 and the closing half-shaft 22 to rotate together, causing the first slender rod of the closing top plate 23 to approach and trigger the closing trip unit 24. The triggering of the closing trip unit 24 can also be achieved in response to a remote control signal. The triggering of the closing trip unit 24 can release the constraint of the holding mechanism on the energy storage shaft 44, allowing the energy storage shaft 44 to rotate under the action of the energy storage spring 49, thereby driving the opening and closing output shaft 7 to rotate, realizing the closing of the downstream circuit breaker. The rotation of the opening and closing output shaft 7 can also drive the opening energy storage mechanism connected to it to perform energy storage action.

[0042] After the closing mechanism 2 completes the closing operation of the closing output shaft 7 and the opening energy storage mechanism completes energy storage, the downstream circuit breaker is in the closed state and ready for the opening operation. For this purpose, an opening mechanism 3 is also arranged on the lower left side of the front plate 11. The opening mechanism 3 basically includes an opening operating component 31, an opening half-shaft 32, an opening top plate 33, and an opening trip unit 34. The opening trip unit 34 can be, for example, an electromagnetic trip unit, which is arranged laterally below the closing output shaft 7. The opening top plate 33, which cooperates with the opening trip unit 34, is fitted onto the opening half-shaft 32, which is pivotally connected between the front plate 11 and the middle plate 12. The front end of the opening half-shaft 32 extends forward from the front plate 11 and passes through the central sleeve hole of the opening top plate 33. Two slender rods extend from the central sleeve hole of the opening top plate 33, with the first slender rod located on one side of the opening trip unit 34. The tripping operation component 31 can be a tripping button mounted on the front panel 11. When the tripping button is pressed, it abuts against the second slender rod of the tripping top plate 33, thereby driving the tripping top plate 33 and the tripping half-shaft 32 to rotate together, causing the first slender rod of the tripping top plate 32 to approach and trigger the tripping trip unit 34. The triggering of the tripping trip unit 34 can also be achieved in response to a remote control signal. The triggering of the tripping trip unit 34 releases the constraint of the closing holding mechanism on the opening and closing output shaft 7. Under the action of the energy storage spring of the tripping energy storage mechanism, the opening and closing output shaft 7 rotates and drives the downstream circuit breaker to trip. After the tripping is completed, the energy storage shaft 44 can be driven to rotate to perform the closing energy storage action under the operation of the energy storage motor 42 or manual operation.

[0043] In order to transmit opening and closing information to users, an opening and closing indicator mechanism 6 can be provided for the opening and closing output shaft 7. The opening and closing indicator 61 of the opening and closing indicator mechanism 6 is connected to the front end of the opening and closing output shaft 7 and can rotate synchronously with the rotation of the opening and closing output shaft 7 to transmit the opening and closing information of the downstream circuit breaker to the user.

[0044] like Figure 6As exemplarily shown, the opening / closing indicator 61 is a one-piece molded part, including a sleeve portion 611 and an indicator portion 613 formed at one end of the sleeve portion 611. The sleeve portion 611 is sleeved onto the front end of the opening / closing output shaft 7 and is fixed by a detachable pin. The indicator portion 613 expands radially relative to the sleeve portion 611 to form an indicator plate. The surface of the indicator plate may be provided with text or color to clearly indicate opening and closing information. The sleeve portion 611 has a protruding crank arm 612 integrally formed, and a through hole for mounting a spring 63 is formed on the crank arm 612. Near the opening / closing output shaft 7, specifically at the lower left of the opening / closing output shaft 7, a counter 62 is mounted on the front plate 11. The counter 62 has a crank arm 621 integrally extended from the housing, and the crank arm 621 has a through hole for mounting a spring 63. In this way, the spring 621 is connected between the opening / closing indicator 61 and the counter 62, so that the opening / closing indicator 61 can be converted into an electrical signal recognizable by the counter 62 with each rotation of the opening / closing output shaft 7.

[0045] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0046] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A circuit breaker mechanism, wherein the circuit breaker mechanism is installed in a ring main unit, and the ring main unit has a front side and a rear side in the width direction, the circuit breaker mechanism comprising a front plate, a middle plate and a rear plate arranged sequentially from front to back, characterized in that, The circuit breaker mechanism includes: An energy storage motor is detachably mounted on the front panel; The motor output shaft passes through the front plate and the middle plate and is directly connected to the energy storage motor; An energy storage shaft is disposed through the front plate and the middle plate and spaced apart from the motor output shaft; A transmission mechanism is connected between the motor output shaft and the energy storage shaft; An energy storage indicator is attached to the front end of the energy storage shaft that extends forward from the front plate; An energy storage spring is arranged between the middle plate and the rear plate, with one end controlled to be connected to the rear end of the energy storage shaft that extends rearward from the middle plate, and the other end connected to a short shaft fixed between the middle plate and the rear plate.

2. The circuit breaker mechanism according to claim 1, characterized in that, The circuit breaker mechanism includes an auxiliary switch mounted to the front surface of the front panel, the auxiliary switch being electrically connected to a micro switch mounted on the front panel and capable of emitting an electrical signal in response to the rotation of the energy storage shaft into position.

3. The circuit breaker mechanism according to claim 2, characterized in that, The energy storage indicator is a one-piece molded component, comprising: The sleeve portion is sleeved on the front end of the energy storage shaft and has an integral cam portion extending in the circumferential direction. When the energy storage shaft rotates to the position, the cam portion triggers the micro switch to send an electrical signal. An indicator portion is formed at the end of the sleeve portion away from the front plate.

4. The circuit breaker mechanism according to claim 1, characterized in that, The circuit breaker mechanism includes: The opening and closing output shaft is pivotally mounted through the front plate and the middle plate; The opening and closing indicator is connected to the front end of the opening and closing output shaft that extends forward from the front plate; A counter is mounted on the front panel and adjacent to the opening and closing output shaft; A spring is operatively connected between the opening / closing indicator and the counter.

5. The circuit breaker mechanism according to claim 4, characterized in that, The opening and closing indicator is a one-piece molded component, including: A sleeve portion is fitted onto the front end of the opening and closing output shaft; An indicator portion is formed at the end of the sleeve portion away from the front plate; The crank arm extends integrally from the sleeve portion and has a through hole at one end for mounting the spring.

6. The circuit breaker mechanism according to claim 4, characterized in that, The counter includes: The outer casing is mounted on the front panel; The crank arm extends integrally from the housing and has a through hole for mounting the other end of the spring.

7. The circuit breaker mechanism according to claim 4, characterized in that, The circuit breaker mechanism includes a closing mechanism located above the opening and closing output shaft, the closing mechanism comprising: A closing operation component is mounted on the front panel and has a movable closing operation end; The closing half-shaft is pivotally mounted through the front plate and the middle plate; The closing top plate is sleeved on the end of the closing half shaft; A closing trip unit is vertically mounted on the forward-facing surface of the front panel; The closing top plate can be driven by the moving closing operation terminal to approach and trigger the closing trip unit.

8. The circuit breaker mechanism according to claim 4, characterized in that, The circuit breaker mechanism includes a tripping mechanism located below the opening and closing output shaft, the tripping mechanism comprising: The tripping operation component is installed on the front panel and has a movable tripping operation end; The tripping half-shaft is pivotally mounted through the front plate and the middle plate; The tripping top plate is sleeved on the end of the tripping half shaft; The trip unit is mounted laterally on the forward-facing surface of the front panel; The tripping top plate can be driven by the moving tripping operation terminal to approach and trigger the tripping trip unit.

9. A ring main unit, comprising a cabinet and a circuit breaker mechanism installed in the cabinet, characterized in that, The circuit breaker mechanism is the circuit breaker mechanism according to any one of claims 1 to 8.

10. The ring main unit according to claim 9, characterized in that, The cabinet is 350 mm wide.

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