Spring operating mechanism three-opening device and circuit breaker

Abstract

A spring operating mechanism three-opening device comprises a fixed plate connected to a spring operating mechanism main body; the main branch coil electromagnet and the auxiliary branch coil electromagnet are horizontally fixed at the bottom of the fixed plate in parallel and are respectively provided with a main opening rod and an auxiliary opening rod; the rotating shaft is provided with a main opening latch matched with the main opening rod and an auxiliary opening latch matched with the auxiliary opening rod, and the main opening latch and the auxiliary opening latch are used for driving the rotating shaft to rotate; the main opening latch is matched with a retaining latch of the spring operating mechanism; and two sub-coil electromagnets and two sub-brake latches. The two sub-coil electromagnets are fixed at the bottom of the fixed plate, are horizontally arranged in parallel with the main sub-coil electromagnet, and are provided with two sub-brake rods; the two pairs of opening latches are connected to the rotating shaft and can drive the rotating shaft to rotate under the impact of the two pairs of opening rods. Double insurance is realized, the reliability of opening operation of the circuit breaker is improved, and the service life of the short-circuiter can be prolonged. The utility model also discloses a circuit breaker.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a three-opening device of a spring operating mechanism and a circuit breaker. Background Art

[0002] A high-voltage circuit breaker (or high-voltage switch) can not only cut off or close the no-load current and load current in a high-voltage circuit, but also cut off the overload current and short-circuit current through the action of a relay protection device when a system fault occurs. It has a quite perfect arc extinguishing structure and sufficient breaking capacity, and can be divided into: oil circuit breakers (multi-oil circuit breakers, less-oil circuit breakers), sulfur hexafluoride circuit breakers (SF6 circuit breakers), compressed air circuit breakers, vacuum circuit breakers, etc.

[0003] The opening and closing actions of the contacts in the circuit breaker are realized by the operating mechanism. In the voltage class of 126 - 252 kV, the spring operating mechanism has become the first choice of operating mechanism due to its advantages such as fast response. The power grid requires that the spring operating mechanisms equipped for 110 kV and 220 kV circuit breakers should be configured with replaceable opening electromagnets. When the main coil fails, the backup coil can be connected to the opening circuit to realize the opening action, so as to improve the reliability of the circuit breaker opening operation.

[0004] However, the existing circuit breaker has only one backup opening coil electromagnet, with low reliability and unable to meet the requirements of two backup opening coils for foreign projects. Therefore, it is necessary to improve and optimize the existing structure. Summary of the Utility Model

[0005] In view of the problems and deficiencies existing in the prior art, the utility model provides a three-opening device of a spring operating mechanism and a circuit breaker.

[0006] The technical solution of the utility model is as follows:

[0007] A three-opening device of a spring operating mechanism, comprising:

[0008] A fixing plate, connected to the main body of the spring operating mechanism;

[0009] A main opening coil electromagnet and a first auxiliary opening coil electromagnet, horizontally and juxtaposedly fixed at the bottom of the fixing plate, respectively having a main opening rod and a first auxiliary opening rod;

[0010] A rotating shaft, provided with a main opening pawl cooperating with the main opening rod and a first auxiliary opening pawl cooperating with the first auxiliary opening rod, and the main opening pawl cooperates with the holding pawl of the spring operating mechanism;

[0011] Specifically, when the main shunt coil electromagnet is energized, the iron core is attracted and drives the main shunt rod to move upward, hitting the main shunt pawl. The main shunt pawl rotates to drive the rotating shaft to rotate, driving the retaining pawl cooperating with the main shunt pawl to act, thereby driving the spring operating mechanism to achieve the opening action. When the main shunt coil electromagnet fails, a pair of shunt electromagnet coils are energized, the iron core is attracted and drives a pair of shunt rods to move upward, hitting a pair of shunt pawls. The pair of shunt pawls rotate and drive the rotating shaft to rotate at the same time. The rotating shaft drives the main shunt pawl to rotate, thereby driving the retaining pawl cooperating with the main shunt pawl to act, and further driving the spring operating mechanism to achieve the opening action.

[0012] This triple-opening device further includes two pairs of shunt coil electromagnets and two pairs of shunt pawls;

[0013] The two pairs of shunt coil electromagnets are fixed at the bottom of the fixing plate, arranged horizontally in parallel with the main shunt coil electromagnet, and are provided with two pairs of shunt rods thereon;

[0014] The two pairs of shunt pawls are connected to the rotating shaft and can drive the rotating shaft to rotate under the impact of the two pairs of shunt rods.

[0015] When the main shunt coil electromagnet and a pair of shunt coil electromagnets do not work, the two pairs of shunt electromagnet coils are energized, the iron core is attracted and drives the two pairs of shunt rods to move upward, hitting the two pairs of shunt pawls. The two pairs of shunt pawls rotate and drive the rotating shaft to rotate at the same time. The rotating shaft drives the main shunt pawl to rotate, thereby driving the retaining pawl cooperating with the main shunt pawl to act, and further driving the spring operating mechanism to achieve the opening action. Thus, a double insurance is achieved, the reliability of the circuit breaker opening operation is improved, and the two pairs of shunt coil electromagnets and a pair of shunt coil electromagnets are used in combination, which can extend the service life of the circuit breaker.

[0016] According to a specific embodiment, the two pairs of shunt coil electromagnets and a pair of shunt coil electromagnets are symmetrically arranged with respect to the main shunt coil electromagnet. By symmetrically arranging, the uniformity of the forces on both sides of the fixing plate and the rotating shaft is improved, preventing the repeated impact of a pair of shunt rods on one side from causing the fixing plate or the rotating shaft to bend, and it is also beneficial to the reasonable layout of the spring operating mechanism, thereby reducing the volume.

[0017] According to a specific embodiment, the two pairs of shunt coil electromagnets include an upper iron core and a lower iron core that are arranged up and down and can be attracted or separated, and a coil arranged between the upper and lower iron cores. The two pairs of shunt rods are connected to the lower iron core.

[0018] According to a specific embodiment, the second auxiliary opening pawl is detachably connected to the rotating shaft, symmetrically arranged with the first auxiliary opening pawl on both sides of the main opening pawl, and located at both ends of the rotating shaft. Specifically, square shafts are provided at both ends of the rotating shaft, and square holes matching therewith are provided on the first auxiliary opening pawl and the second auxiliary opening pawl. An opening is provided at the rear side of the square hole, and a connecting plate extending backward is provided at the rear end of the opening. The connecting plates are connected up and down by bolts and thus fixed on the rotating shaft.

[0019] Furthermore, the middle part of the rotating shaft has the largest shaft diameter, on which the main opening pawl is connected. Shaft ends with shaft diameters smaller than that of the middle part are symmetrically arranged at both ends, and the square shafts are respectively connected to the ends. The distance between the connecting plates is 5 - 10 mm.

[0020] A circuit breaker includes a spring operating mechanism, and the spring operating mechanism has the above-mentioned three-opening device.

[0021] The beneficial effects of the present utility model are as follows:

[0022] By setting the second auxiliary opening coil electromagnet and the second auxiliary opening pawl, double insurance is achieved, the reliability of the opening operation of the circuit breaker is improved, and the service life of the circuit breaker is prolonged. Moreover, the second auxiliary opening coil electromagnets are horizontally arranged side by side on one side of the main opening coil electromagnet and symmetrically arranged with the first auxiliary opening coil electromagnets, and the second auxiliary opening pawls and the first auxiliary opening pawls are symmetrically arranged on the rotating shaft, which is beneficial to improving the stability of the fixing plate and the rotating shaft. Description of the Drawings

[0023] Figure 1 is a perspective view of the spring operating mechanism;

[0024] Figure 2 is Figure 1 a partial enlarged view at A in

[0025] 1. Fixing plate; 2. First auxiliary opening coil electromagnet; 3. Main opening coil electromagnet; 4. Second auxiliary opening coil electromagnet; 5. Rotating shaft; 6. Second auxiliary opening pawl; 7. Main opening pawl; 8. First auxiliary opening pawl; 21. First auxiliary opening rod; 31. Main opening rod; 41. Second auxiliary opening rod. Specific Embodiments

[0026] Next, the technical means for achieving the predetermined invention purpose of the present utility model will be further elaborated in combination with the drawings in the embodiments of the present utility model.

[0027] Refer to Figure 1 and Figure 2 As shown, a three-opening device for a spring operating mechanism includes:

[0028] A fixing plate 1, connected to the main body of the spring operating mechanism;

[0029] The main shunt coil electromagnet 3 and a pair of shunt coil electromagnets 2 are horizontally and juxtaposedly fixed at the bottom of the fixing plate 1, and respectively have a main shunt rod 31 and a pair of shunt rods 21;

[0030] A rotating shaft 5 is provided with a main shunt pawl 7 cooperating with the main shunt rod 31 and a pair of shunt pawls 8 cooperating with the pair of shunt rods 21, and the main shunt pawl 7 cooperates with the holding pawl of the spring operating mechanism;

[0031] Specifically, when the main shunt coil electromagnet 3 is energized, the iron core is attracted and drives the main shunt rod 31 to move upward, and impacts the main shunt pawl 7. The main shunt pawl 7 rotates to drive the rotating shaft 5 to rotate, driving the holding pawl cooperating with the main shunt pawl 7 to act, so as to drive the spring operating mechanism to realize the opening operation. When the main shunt coil electromagnet 3 fails, the pair of shunt electromagnet coils are electrified, the iron core is attracted and drives the pair of shunt rods 21 to move upward, and impacts the pair of shunt pawls 8. The pair of shunt pawls 8 rotate and drive the rotating shaft 5 to rotate at the same time. The rotating shaft 5 drives the main shunt pawl 7 to rotate, so as to drive the holding pawl cooperating with the main shunt pawl 7 to act, and further drive the spring operating mechanism to realize the opening operation.

[0032] The triple-opening device further includes two pairs of shunt coil electromagnets 4 and two pairs of shunt pawls 6;

[0033] The two pairs of shunt coil electromagnets 4 are fixed at the bottom of the fixing plate 1, are horizontally juxtaposed with the main shunt coil electromagnet 3, and are provided with two pairs of shunt rods 41 thereon;

[0034] The two pairs of shunt pawls 6 are connected to the rotating shaft 5 and can drive the rotating shaft 5 to rotate under the impact of the two pairs of shunt rods 41.

[0035] When the main shunt coil electromagnet 3 and the pair of shunt coil electromagnets 2 do not work, the two pairs of shunt electromagnet coils are electrified, the iron core is attracted and drives the two pairs of shunt rods 41 to move upward, and impacts the two pairs of shunt pawls 6. The two pairs of shunt pawls 6 rotate and drive the rotating shaft 5 to rotate at the same time. The rotating shaft 5 drives the main shunt pawl 7 to rotate, so as to drive the holding pawl cooperating with the main shunt pawl 7 to act, and further drive the spring operating mechanism to realize the opening operation. Thus, a double insurance is achieved, the reliability of the opening operation of the circuit breaker is improved, and the two pairs of shunt coil electromagnets 4 and the pair of shunt coil electromagnets 2 are used in combination, which can extend the service life of the circuit breaker.

[0036] According to a specific embodiment, the two pairs of shunt coil electromagnets 4 and the pair of shunt coil electromagnets 2 are symmetrically arranged with respect to the main shunt coil electromagnet 3. By symmetrically arranging, the uniformity of the forces on both sides of the fixing plate 1 and the rotating shaft 5 is improved, preventing the pair of shunt rods 21 from repeatedly impacting one side and causing the fixing plate 1 or the rotating shaft 5 to bend, and it is also beneficial to reasonably layout the spring operating mechanism, thereby reducing the volume.

[0037] According to a specific embodiment, the second auxiliary split coil electromagnet 4 includes an upper iron core and a lower iron core which are arranged up and down and can be attracted or separated, and a coil arranged between the upper and lower iron cores. The second auxiliary opening lever 41 is connected to the lower iron core.

[0038] According to a specific embodiment, the second auxiliary opening pawl 6 is detachably connected to the rotating shaft 5, and is symmetrically arranged with the first auxiliary opening pawl 8 on both sides of the main opening pawl 7, and is located at both ends of the rotating shaft 5. Specifically, square shafts are provided at both ends of the rotating shaft 5, and square holes are provided on the first auxiliary opening pawl 8 and the second auxiliary opening pawl 6 to cooperate with them. An opening is provided at the rear side of the square hole, and a connecting plate extending backward is provided at the rear end of the opening. The connecting plates are connected up and down by bolts to be fixed on the rotating shaft 5.

[0039] Further, the middle part of the rotating shaft 5 has the largest shaft diameter, on which the main opening pawl 7 is connected. Shaft ends with shaft diameters smaller than the middle part are symmetrically arranged at both ends, and the square shafts are respectively connected to the ends. The distance between the above-mentioned connecting plates is 5-10 mm. A round hole is provided on one connecting plate, and a threaded hole is provided on one connecting plate. The bolt passes through the round hole and cooperates with the threaded hole. By rotating the bolt, the distance between the two connecting plates is adjusted, so as to adjust the opening size of the square holes on the first auxiliary opening pawl 8 and the second auxiliary opening pawl 6, and fix the first auxiliary opening pawl 8 and the second auxiliary opening pawl 6 on the rotating shaft, preventing circumferential movement and facilitating installation and disassembly.

[0040] A circuit breaker includes a spring operating mechanism, and the spring operating mechanism has the above-mentioned triple-opening device.

[0041] The above is the preferred embodiment of the present invention. However, the present invention is not limited to the above embodiments and examples. Various changes, equivalent replacements, improvements, etc. made within the scope of knowledge possessed by those skilled in the art without departing from the inventive concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A spring operating mechanism three-way brake device, comprising: A fixing plate (1) connected to the main body of the spring operating mechanism; The main branch coil electromagnet (3) and the auxiliary branch coil electromagnet (2) are horizontally fixed in parallel at the bottom of the fixed plate (1), and respectively have a main branch gate rod (31) and an auxiliary branch gate rod (21); A rotating shaft (5) is provided with a main opening brake catch (7) cooperating with a main opening brake rod (31) and a secondary opening brake catch (8) cooperating with a secondary opening brake rod (21), wherein the main opening brake catch (7) cooperates with a retaining catch of a spring operating mechanism; The invention is characterized in that it also comprises two auxiliary branch coil electromagnets (4) and two auxiliary branch brake latches (6); The two auxiliary sub-coil electromagnets (4) are fixed to the bottom of the fixed plate (1), and are arranged horizontally in parallel with the main sub-coil electromagnet (3), and two auxiliary gate rods (41) are arranged thereon; The two auxiliary opening brake latches (6) are connected to the rotating shaft (5) and can drive the rotating shaft (5) to rotate under the impact of the two auxiliary opening brake rods (41).

2. The three-way switch device according to claim 1, characterized in that: The two auxiliary sub-coil electromagnets (4) and the auxiliary sub-coil electromagnet (2) are arranged symmetrically with respect to the main sub-coil electromagnet (3).

3. The three-way switch device according to claim 1, characterized in that: The two auxiliary branch coil electromagnets (4) comprise an upper iron core and a lower iron core which are arranged up and down and can be attracted or separated, and a coil arranged between the upper and lower iron cores. The two auxiliary branch gate rods (41) are connected to the lower iron core.

4. The three-way switch device according to claim 2, characterized in that: The two auxiliary opening brake latches (6) are detachably connected to the rotating shaft (5), and are symmetrically arranged with an auxiliary opening brake latch (8) on both sides of the main opening brake latch (7), and are located at both ends of the rotating shaft.

5. The three-way switch device according to claim 4, characterized in that: The two ends of the rotating shaft (5) are provided with square shafts, and a square hole matching with the first and second second opening brake latches (8) is provided on each of the first and second opening brake latches (6). An opening is provided at the rear side of the square hole, and two connecting plates extending backward are provided at the rear end of the opening. The connecting plates are arranged at intervals up and down, and are connected up and down by bolts to be fixed on the rotating shaft (5).

6. The three-way switch device according to claim 5, characterized in that: The shaft (5) has the largest diameter in the middle, to which the main opening brake latch (7) is connected. Shaft ends with diameters smaller than the middle are symmetrically arranged at both ends, and the ends are respectively connected to the square shafts.

7. The three-way switch device according to claim 5, characterized in that: The spacing between the connecting plates is 5-10 mm.

8. A circuit breaker, characterized in that: It comprises a spring operating mechanism, and the spring operating mechanism has the three-trip switch device according to any one of claims 1 to 7.

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