Energy storage device for circuit breaker

Abstract

The utility model provides an energy storage device for a circuit breaker. The energy storage device comprises a motor (10), a gear (16) and an elastic element. The electric machine (10) comprises a rotor shaft (12), the rotor shaft (12) comprises a mounting shaft portion (14), and the mounting shaft portion (14) has a non-circular outer contour. The gear (16) includes a mounting hole portion (18) having an inner contour that is the same as the outer contour of the mounting shaft portion (14). The elastic element is connected to the rotor shaft (12) via a gear (16) and is elastically deformable under the drive of the motor (10). The mounting hole portion (18) receives at least a portion of the mounting shaft portion (14) such that an outer contour of the mounting shaft portion (14) and an inner contour of the mounting hole portion (18) coincide with each other such that torque generated by the motor (10) can be transmitted from the mounting shaft portion (14) to the mounting hole portion (18). In this way, the energy storage device can have high reliability.

Description

Technical Field

[0001] This disclosure belongs to the field of electrical equipment technology, and specifically relates to an energy storage device for circuit breakers. Background Technology

[0002] With the rapid development of the economy and society, users have increasingly higher requirements for the reliability of the power grid. As a crucial component for closing, breaking, and carrying current, the reliability of high-voltage circuit breakers (or high-voltage switches) is of paramount importance to the power grid. Typically, high-voltage circuit breakers use energy storage devices to perform the opening or closing actions, thereby improving the speed and stability of operation.

[0003] For example, in some energy storage devices, a motor uses gears to cause the closing spring to elastically deform, thereby converting electrical energy into elastic potential energy. The motor's rotor shaft is connected to a pinion pin, with the pin having an interference fit with both the rotor shaft and the pinion. However, in some cases, the fit between the pin and the rotor shaft and pinion pinion is not ideal, making the pin prone to cracking during installation. Under the shear force generated by torque, the crack may propagate and cause the pin to break, preventing the energy storage device from storing energy. Utility Model Content

[0004] To address the aforementioned technical problems, this disclosure provides an energy storage device for a circuit breaker, comprising: a motor including a rotor shaft, the rotor shaft including a mounting shaft portion having a non-circular outer contour; a gear including a mounting hole portion having an inner contour with the same shape as the outer contour of the mounting shaft portion; and an elastic element connected to the rotor shaft via the gear and capable of elastic deformation under the drive of the motor, wherein the mounting hole portion receives at least a portion of the mounting shaft portion such that the outer contour of the mounting shaft portion and the inner contour of the mounting hole portion match each other, thereby enabling the torque generated by the motor to be transmitted from the mounting shaft portion to the mounting hole portion.

[0005] In this disclosure, by providing a mounting shaft portion with a non-circular outer contour and a mounting hole portion that mates with it, the rotor shaft and gear do not need to be connected by pins, thereby avoiding the problem of energy storage failure due to pin breakage, and enabling the energy storage device to have high reliability.

[0006] Furthermore, the outer contour of the mounting shaft portion includes one or more outer straight line segments, and the inner contour of the mounting hole portion includes one or more inner straight line segments that match the outer straight line segments.

[0007] In this disclosure, by setting mutually matching outer and inner straight segments, the outer contour of the mounting shaft and the inner contour of the mounting hole are easy to process, enabling the energy storage device to have a lower cost.

[0008] Furthermore, the plurality of outer straight segments are evenly arranged in the circumferential direction of the rotor shaft, and the plurality of inner straight segments are evenly arranged in the circumferential direction of the gear.

[0009] In this disclosure, by providing multiple outer straight segments and multiple inner straight segments, the rotor shaft and gears can transmit larger loads. Furthermore, by arranging the multiple outer straight segments and multiple inner straight segments uniformly in the circumferential direction, the load between the rotor shaft and gears can be uniformly distributed in the circumferential direction, thereby further improving the reliability of the energy storage device.

[0010] Furthermore, the rotor shaft also includes an intermediate shaft portion adjacent to the mounting shaft portion, the intermediate shaft portion being disposed on the side of the mounting shaft portion facing the stator of the motor; the outer contour of the intermediate shaft portion has a different shape from the outer contour of the mounting shaft portion, such that a step portion is formed between the mounting shaft portion and the intermediate shaft portion; the step portion abuts against the gear to limit the gear in the axial direction of the rotor shaft.

[0011] In this disclosure, by setting an intermediate shaft portion and making the outer contour of the intermediate shaft portion different from the outer contour of the mounting shaft portion, the stepped portion can be formed in a simple manner, thereby further reducing the cost of the energy storage device.

[0012] Furthermore, the outer contour of the intermediate shaft portion is circular, and the outer contour of the mounting shaft portion does not exceed the outer contour of the intermediate shaft portion in the radial direction of the rotor shaft.

[0013] In this disclosure, the rotor shaft is easy to machine by making the outer contour of the intermediate shaft portion circular and ensuring that the outer contour of the mounting shaft portion does not exceed the outer contour of the intermediate shaft portion. This configuration is particularly advantageous when there is a matching portion between the outer contours of the mounting shaft portion and the outer contour of the intermediate shaft portion, which can be machined together, for example, during turning.

[0014] Furthermore, the energy storage device also includes a limiting element; the limiting element is mounted on the rotor shaft and is at least partially positioned on the side of the gear away from the stepped portion; the limiting element abuts against the gear to limit the gear in the axial direction of the rotor shaft.

[0015] In this disclosure, by providing a limiting element used in conjunction with the step portion, the energy storage device can fully limit the gear in a simple and reliable manner.

[0016] Furthermore, the limiting element includes a retaining ring, which is mounted on the mounting shaft and abuts against the gear; the outer contour of the mounting shaft includes one or more outer arc segments, and the outer peripheral surface defining the outer arc segment is provided with a mounting groove extending in the circumferential direction, the mounting groove receiving the inner peripheral portion of the retaining ring.

[0017] In this disclosure, by setting a retaining ring and mounting groove, the energy storage device can have a relatively simple structure, thereby further improving the reliability of the energy storage device and further reducing the cost of the energy storage device.

[0018] Furthermore, the plurality of said outer circular arc segments are evenly arranged in the circumferential direction of the rotor shaft.

[0019] In this disclosure, by arranging multiple outer arc segments evenly in the circumferential direction, the load between the rotor shaft and the snap ring can be evenly distributed in the circumferential direction, thereby further improving the reliability of the energy storage device.

[0020] Furthermore, the limiting element includes a bolt and a washer; the bolt is screwed onto the rotor shaft, and the axial direction of the bolt is parallel to the axial direction of the rotor shaft; the washer abuts against the gear and is clamped by the rotor shaft and the bolt.

[0021] In this disclosure, by setting bolts and washers, the energy storage device can have a relatively simple structure, thereby further improving the reliability of the energy storage device and further reducing the cost of the energy storage device.

[0022] Furthermore, the end face of the gear is provided with a groove, which receives at least a portion of the limiting element.

[0023] In this disclosure, by having the groove receive at least a portion of the limiting element, the energy storage device can have a compact structure, thereby facilitating the miniaturization of the energy storage device. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:

[0025] Figure 1 This is a front view of a partial structure of an energy storage device for a circuit breaker according to a first embodiment of this disclosure;

[0026] Figure 2 yes Figure 1 A top view of part of the structure of the energy storage device shown;

[0027] Figure 3This is a top view of a partial structure of an energy storage device for a circuit breaker according to a second embodiment of this disclosure;

[0028] Figure 4 This is a top view of a partial structure of an energy storage device for a circuit breaker according to a third embodiment of this disclosure;

[0029] Figure 5 This is a front view of a partial structure of an energy storage device for a circuit breaker according to a fourth embodiment of this disclosure.

[0030] Explanation of icon numbers:

[0031] 10. Electric motor;

[0032] 12. Rotor shaft;

[0033] 14. Install the shaft;

[0034] 16. Gear;

[0035] 18. Mounting holes;

[0036] 20. External straight line segment;

[0037] 22. Inner straight line segment;

[0038] 24. Intermediate shaft section;

[0039] 26. Stepped section;

[0040] 28. Snap ring;

[0041] 30. Outer circular arc segment;

[0042] 32. Mounting slot;

[0043] 34. Inner circular arc segment;

[0044] 36. Bolts;

[0045] 38. Gasket;

[0046] 40. Groove. Detailed Implementation

[0047] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise.

[0049] The following reference Figure 1 and Figure 2 The first embodiment of this disclosure is described below.

[0050] Figure 1 This is a front view of a partial structure of an energy storage device for a circuit breaker according to the first embodiment of this disclosure. Figure 2 yes Figure 1 A top view of part of the structure of the energy storage device shown.

[0051] Reference Figure 1 and Figure 2 This disclosure provides an energy storage device for a circuit breaker, including a motor 10, a gear 16, and an elastic element (not shown). The motor 10 includes a rotor shaft 12, which includes a mounting shaft portion 14 having a non-circular outer contour. The gear 16 includes a mounting hole portion 18 having an inner contour with the same shape as the outer contour of the mounting shaft portion 14. The elastic element is connected to the rotor shaft 12 via the gear 16 and is elastically deformable under the drive of the motor 10. The mounting hole portion 18 receives at least a portion of the mounting shaft portion 14 such that the outer contour of the mounting shaft portion 14 and the inner contour of the mounting hole portion 18 match each other, thereby allowing the torque generated by the motor 10 to be transmitted from the mounting shaft portion 14 to the mounting hole portion 18.

[0052] Here, "outer contour of mounting shaft 14" refers to the boundary defined by the outer peripheral surface of mounting shaft 14 in the end face or cross-section of mounting shaft 14, and "inner contour of mounting hole 18" refers to the boundary defined by the inner peripheral surface of mounting hole 18 in the end face or cross-section of mounting hole 18. Here, "outer contour and inner contour coincide with each other" means that the projections of the outer contour and inner contour in the axial direction of rotor shaft 12 and gear 16 coincide with each other, or substantially coincide in cases involving tolerance fit or machining error, for example.

[0053] As an example, the elastic element may include a closing spring, such as a helical spring. As another example, the energy storage device may also include a opening spring, which may be configured to receive the elastic potential energy released by the closing spring when the closing spring releases its elastic potential energy. Of course, the opening spring may also be a helical spring.

[0054] As an example, gear 16 can be connected to a resilient element via one or more other gears, for example, multiple gears including gear 16 can be configured into a speed reduction mechanism.

[0055] As an example, the energy storage device may also include a handle connected to an elastic element, which can be elastically deformed by operation of the handle. As an example, the handle may be connected to the elastic element via a one-way mechanism, such as a ratchet mechanism.

[0056] In this disclosure, by providing a mounting shaft portion 14 with a non-circular outer contour and a mounting hole portion 18 that mates with it, the rotor shaft 12 and the gear 16 do not need to be connected by a pin, thereby avoiding the problem of energy storage failure due to pin breakage, and enabling the energy storage device to have high reliability.

[0057] Reference Figure 1 and Figure 2 The outer contour of the mounting shaft portion 14 includes one or more outer straight line segments 20, and the inner contour of the mounting hole portion 18 includes one or more inner straight line segments 22 that match the outer straight line segments 20. As an example, the mounting shaft portion 14 may have only one outer straight line segment 20, and the mounting hole portion 18 may have only one inner straight line segment 22. As an example, the outer straight line segment 20 and the inner straight line segment 22 may correspond to a central angle greater than or equal to 30°, for example, a central angle of 60° to 90°, preferably a central angle of 70°. Here, "the central angle corresponding to the straight line segment" refers to the angle formed by the line connecting one endpoint of the straight line segment to the center (the point coinciding with the central axis of the shaft or hole) and the line connecting the other endpoint of the straight line segment to the center.

[0058] In this disclosure, by setting the outer straight segment 20 and the inner straight segment 22 that match each other, the outer contour of the mounting shaft portion 14 and the inner contour of the mounting hole portion 18 are easy to process, which enables the energy storage device to have a lower cost.

[0059] Reference Figure 1 The rotor shaft 12 also includes an intermediate shaft portion 24 adjacent to the mounting shaft portion 14, the intermediate shaft portion 24 being disposed on the side of the mounting shaft portion 14 facing the stator of the motor 10. Figure 1 (Lower side of the rotor shaft 12). The outer contour of the intermediate shaft portion 24 has a different shape than that of the mounting shaft portion 14, such that a step portion 26 is formed between the mounting shaft portion 14 and the intermediate shaft portion 24. The step portion 26 abuts against the gear 16 to limit the gear 16 in the axial direction of the rotor shaft 12. As an example, the intermediate shaft portion 24 may extend to the radially inner side of the stator of the motor 10.

[0060] In this disclosure, by providing an intermediate shaft portion 24 and making the outer contour of the intermediate shaft portion 24 different from the outer contour of the mounting shaft portion 14, the stepped portion 26 can be formed in a simple manner, thereby further reducing the cost of the energy storage device.

[0061] Reference Figure 1The outer contour of the intermediate shaft portion 24 is circular, and the outer contour of the mounting shaft portion 14 does not extend beyond the outer contour of the intermediate shaft portion 24 in the radial direction of the rotor shaft 12. As an example, a portion of the outer contour of the mounting shaft portion 14 may match a portion of the outer contour of the intermediate shaft portion 24.

[0062] In this disclosure, the rotor shaft 12 is easy to machine by making the outer contour of the intermediate shaft portion 24 circular and ensuring that the outer contour of the mounting shaft portion 14 does not exceed the outer contour of the intermediate shaft portion 24. In particular, when there is a matching portion between the outer contour of the mounting shaft portion 14 and the outer contour of the intermediate shaft portion 24, the matching portion can be machined together, for example, during turning, making this configuration especially advantageous.

[0063] Reference Figure 1 and Figure 2 The energy storage device also includes a limiting element. The limiting element is mounted on the rotor shaft 12 and is at least partially positioned on the side of the gear 16 opposite to the stepped portion 26. Figure 1 (The upper side of the rotor shaft 12). The limiting element abuts against the gear 16 to limit the gear 16 in the axial direction of the rotor shaft 12.

[0064] In this disclosure, by providing a limiting element used in conjunction with the step portion 26, the energy storage device can fully limit the gear 16 in a simple and reliable manner.

[0065] Reference Figure 1 and Figure 2 The limiting element includes a retaining ring 28. The retaining ring 28 is mounted on the mounting shaft portion 14 and abuts against the gear 16. The outer contour of the mounting shaft portion 14 includes one or more outer arc segments 30, and the outer peripheral surface defining the outer arc segment 30 is provided with a mounting groove 32 extending in the circumferential direction, the mounting groove 32 receiving the inner peripheral portion of the retaining ring 28.

[0066] As an example, the mounting shaft portion 14 may include only one outer arc segment 30, the two ends of which may respectively engage with the two ends of the outer straight segment 20. As an example, the inner contour of the mounting hole portion 18 may include one or more inner arc segments 34 that match the outer arc segment 30.

[0067] In this disclosure, by providing the retaining ring 28 and the mounting groove 32, the energy storage device can have a relatively simple structure, thereby further improving the reliability of the energy storage device and further reducing the cost of the energy storage device.

[0068] Reference Figure 1 and Figure 2The end face of gear 16 is provided with a groove 40, which receives at least a portion of the limiting element. As an example, the groove 40 can receive the entire snap ring 28. As an example, the inner circumferential surface of the groove 40 can be spaced apart from the outer circumferential portion of the snap ring 28, so that the groove 40 can provide space for the elastic deformation of the snap ring 28.

[0069] In this disclosure, by having the groove 40 receive at least a portion of the limiting element, the energy storage device can have a compact structure, thereby facilitating the miniaturization of the energy storage device.

[0070] The following reference Figure 3 The second embodiment of this disclosure is described below. The second embodiment is a variation of the first embodiment. For features that are the same as or similar to those in the first embodiment, the same reference numerals are used in this embodiment, and detailed descriptions of these features are omitted.

[0071] Figure 3 This is a top view of a partial structure of an energy storage device for a circuit breaker according to a second embodiment of this disclosure.

[0072] Reference Figure 3 Multiple outer straight segments 20 are evenly arranged in the circumferential direction of the rotor shaft 12, and multiple inner straight segments 22 are evenly arranged in the circumferential direction of the gear 16. As an example, the outer contour of the mounting shaft 14 may include two outer straight segments 20, which may be offset by 180° around the central axis of the rotor shaft 12.

[0073] In this disclosure, by providing multiple outer straight segments 20 and multiple inner straight segments 22, the rotor shaft 12 and gear 16 can transmit a large load. Furthermore, by arranging the multiple outer straight segments 20 and multiple inner straight segments 22 uniformly in the circumferential direction, the load between the rotor shaft 12 and gear 16 can be uniformly distributed in the circumferential direction, thereby further improving the reliability of the energy storage device.

[0074] Reference Figure 3 Multiple outer circular arc segments 30 are evenly arranged in the circumferential direction of the rotor shaft 12. As an example, the outer contour of the mounting shaft 14 may include two outer circular arc segments 30, which may be offset by 180° around the central axis of the rotor shaft 12. As an example, multiple outer straight segments 20 and multiple outer circular arc segments 30 may be arranged alternately in the circumferential direction of the rotor shaft 12.

[0075] In this disclosure, by arranging multiple outer arc segments 30 evenly in the circumferential direction, the load between the rotor shaft 12 and the snap ring 28 can be evenly distributed in the circumferential direction, thereby further improving the reliability of the energy storage device.

[0076] The following reference Figure 4A third embodiment of this disclosure is described. The third embodiment is a variation of the first embodiment. For features that are the same as or similar to those in the first embodiment, the same reference numerals are used in this embodiment, and detailed descriptions of these features are omitted.

[0077] Figure 4 This is a top view of a partial structure of an energy storage device for a circuit breaker according to a third embodiment of this disclosure.

[0078] Reference Figure 4 Multiple outer straight segments 20 are evenly arranged in the circumferential direction of the rotor shaft 12, and multiple inner straight segments 22 are evenly arranged in the circumferential direction of the gear 16. As an example, the outer contour of the mounting shaft 14 may include four outer straight segments 20, two opposite outer straight segments 20 of the four outer straight segments 20 may be offset by 180° around the central axis of the rotor shaft 12, and two adjacent outer straight segments 20 of the four outer straight segments 20 may be offset by 90° around the central axis of the rotor shaft 12.

[0079] Reference Figure 4 Multiple outer circular arc segments 30 are evenly arranged in the circumferential direction of the rotor shaft 12. As an example, the outer contour of the mounting shaft 14 may include four outer circular arc segments 30. Two opposing outer circular arc segments 30 may be offset by 180° around the central axis of the rotor shaft 12, and two adjacent outer circular arc segments 30 may be offset by 90° around the central axis of the rotor shaft 12.

[0080] The following reference Figure 5 The fourth embodiment of this disclosure is described below. The fourth embodiment is a variation of the first embodiment. For features that are the same as or similar to those in the first embodiment, the same reference numerals are used in this embodiment, and detailed descriptions of these features are omitted.

[0081] Figure 5 This is a top view of a partial structure of an energy storage device for a circuit breaker according to a fourth embodiment of this disclosure.

[0082] Reference Figure 5 The limiting element includes a bolt 36 and a washer 38. The bolt 36 is screwed onto the rotor shaft 12, and the axial direction of the bolt 36 is parallel to the axial direction of the rotor shaft 12. The washer 38 abuts against the gear 16 and is held together by the rotor shaft 12 and the bolt 36. As an example, the bolt 36 may be arranged coaxially with the rotor shaft 12. As an example, the groove 40 may receive the entire washer 38. In other embodiments, the washer 38 may be elastic and configured to bias the gear 16 toward the step portion 26; for example, the washer 38 may be a metal sheet capable of elastic deformation in the axial direction of the rotor shaft 12.

[0083] In this disclosure, by setting bolts 36 and washers 38, the energy storage device can have a relatively simple structure, thereby further improving the reliability of the energy storage device and further reducing the cost of the energy storage device.

[0084] This disclosure also provides a circuit breaker that includes the energy storage device of the various embodiments described above.

[0085] The above are merely preferred embodiments of this disclosure. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this disclosure, and these improvements and modifications should also be considered within the scope of protection of this disclosure.

Claims

1. An energy storage device for a circuit breaker, characterized in that, include: The motor (10) includes a rotor shaft (12), the rotor shaft (12) includes a mounting shaft portion (14), the mounting shaft portion (14) having a non-circular outer contour; Gear (16), the gear (16) including a mounting hole (18) having an inner contour with the same shape as the outer contour of the mounting shaft (14); and An elastic element, connected to the rotor shaft (12) via the gear (16), is capable of elastic deformation under the drive of the motor (10), wherein... The mounting hole (18) receives at least a portion of the mounting shaft (14) such that the outer contour of the mounting shaft (14) and the inner contour of the mounting hole (18) match each other, so that the torque generated by the motor (10) can be transmitted from the mounting shaft (14) to the mounting hole (18).

2. The energy storage device according to claim 1, characterized in that, The outer contour of the mounting shaft (14) includes one or more outer straight segments (20), and The inner contour of the mounting hole (18) includes one or more inner straight segments (22) that match the outer straight segment (20).

3. The energy storage device according to claim 2, characterized in that, The plurality of said outer straight segments (20) are evenly arranged in the circumferential direction of the rotor shaft (12), and Multiple inner straight segments (22) are evenly arranged in the circumferential direction of the gear (16).

4. The energy storage device according to any one of claims 1 to 3, characterized in that, The rotor shaft (12) also includes an intermediate shaft (24) adjacent to the mounting shaft (14), the intermediate shaft (24) being disposed on the side of the mounting shaft (14) facing the stator of the motor (10); The outer contour of the intermediate shaft portion (24) has a different shape from the outer contour of the mounting shaft portion (14), so that a step portion (26) is formed between the mounting shaft portion (14) and the intermediate shaft portion (24); The stepped portion (26) abuts against the gear (16) to limit the gear (16) in the axial direction of the rotor shaft (12).

5. The energy storage device according to claim 4, characterized in that, The outer contour of the intermediate shaft portion (24) is circular, and the outer contour of the mounting shaft portion (14) does not extend beyond the outer contour of the intermediate shaft portion (24) in the radial direction of the rotor shaft (12).

6. The energy storage device according to claim 4, characterized in that, The energy storage device also includes a limiting element; The limiting element is mounted on the rotor shaft (12) and is at least partially positioned on the side of the gear (16) opposite to the stepped portion (26); The limiting element abuts against the gear (16) to limit the gear (16) in the axial direction of the rotor shaft (12).

7. The energy storage device according to claim 6, characterized in that, The limiting element includes a retaining ring (28), which is mounted on the mounting shaft (14) and abuts against the gear (16); The outer contour of the mounting shaft (14) includes one or more outer arc segments (30), and the outer peripheral surface of the outer arc segment (30) is provided with a mounting groove (32) extending in the circumferential direction, the mounting groove (32) receiving the inner peripheral portion of the snap ring (28).

8. The energy storage device according to claim 7, characterized in that, Multiple outer circular arc segments (30) are evenly arranged in the circumferential direction of the rotor shaft (12).

9. The energy storage device according to claim 6, characterized in that, The limiting element includes a bolt (36) and a washer (38); The bolt (36) is screwed onto the rotor shaft (12), and the axial direction of the bolt (36) is parallel to the axial direction of the rotor shaft (12); The gasket (38) abuts against the gear (16) and is held together by the rotor shaft (12) and the bolt (36).

10. The energy storage device according to claim 6, characterized in that, The end face of the gear (16) is provided with a groove (40), which receives at least a portion of the limiting element.

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