Phase change structure for three-phase unbalanced circuit breaker

Abstract

The invention relates to the technical field of phase-change circuit breakers, in particular to a phase-change structure for a three-phase unbalanced circuit breaker, which comprises a fixed shell, three change-over switches are sequentially arranged in the fixed shell along the left-right direction, each change-over switch comprises a trigger block, each trigger block is fixedly arranged on a rotating cylinder, and the rotating cylinder is fixedly arranged on the fixed shell. A transmission shaft is rotationally arranged in each rotating cylinder, a transmission gear sleeve is arranged on each transmission shaft, each transmission gear sleeve comprises two gear sections and a smooth section, a driving shaft is rotationally arranged on the fixed shell, three driving gears are arranged on the driving shaft, and the driving shaft can move in the left-right direction so that the driving shaft can have three positions; each position enables two driving gears on the driving shaft to be meshed with gear sections of two transmission gear sleeves, the other driving gear corresponds to a smooth section of the other transmission gear sleeve, rotation of the driving shaft enables the two rotating cylinders to rotate at the same time, and then two reversing switches are made to switch opening and closing at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of phase-changing circuit breakers, and in particular to a phase-changing structure for a three-phase unbalanced circuit breaker. Background Art

[0002] In power distribution systems, long-term three-phase imbalance can exacerbate thermal stress on electrical equipment, increase equipment burden, and potentially cause insulation aging and shortened service life. Therefore, maintaining three-phase balance is crucial. In existing technology, a three-phase imbalance circuit breaker is typically installed to achieve three-phase balance.

[0003] When a three-phase unbalanced circuit breaker is working, it is necessary to switch different reversing switches to distribute electrical energy. However, when switching the reversing switches, multiple phase lines may be simultaneously conductive or non-conductive, resulting in line faults. Summary of the Invention

[0004] Based on this, it is necessary to provide a phase-changing structure for a three-phase unbalanced circuit breaker to address the technical problem that the current three-phase unbalanced circuit breaker is prone to line faults.

[0005] The above purpose is achieved through the following technical solutions: A phase-changing structure for a three-phase unbalanced circuit breaker includes a fixed housing, wherein three reversing switches are sequentially arranged inside the fixed housing, with the arrangement direction defined as left-right. Each reversing switch corresponds to a phase circuit, and each reversing switch includes a trigger block. The reversing switch can be opened and closed by rotating the trigger block. Each trigger block is fixedly mounted on a rotating cylinder, wherein the axis of the rotating cylinder extends in the left-right direction. A transmission shaft is rotatably disposed inside each rotating cylinder, and each transmission shaft is provided with a transmission gear sleeve. The transmission gear sleeve includes two gear segments and a smooth segment. The smooth segments of the three transmission gear sleeves corresponding to the three reversing switches are positioned differently. A drive shaft is rotatably provided on the fixed shell, and three drive gears are provided on the drive shaft. The drive shaft can move in the left and right directions so that the drive shaft has three positions. In each position, two of the drive gears on the drive shaft are engaged with the gear segments of two of the transmission gear sleeves, and the other drive gear corresponds to the smooth segment of the other transmission gear sleeve, so that the drive shaft can synchronously drive the two transmission shafts to rotate; Each transmission shaft is provided with a sliding gear that can slide in the left and right directions, and a left ring gear and a right ring gear are provided inside the rotating cylinder; the two transmission shafts that cooperate with the drive shaft transmission, the sliding gear on one transmission shaft is located on the left and meshes with the left ring gear, and the sliding gear on the other transmission shaft is located on the right and meshes with the right ring gear. During one rotation stroke of the drive shaft, the two rotating cylinders rotate in opposite directions at the same time, thereby causing the corresponding two reversing switches to switch on and off at the same time.

[0006] Furthermore, a driving member is provided inside the rotating cylinder, and the rotation of the rotating cylinder can enable the driving member to drive the sliding gear to switch left and right positions. The sliding gear is magnetic, and the driving member is a first magnet and a second magnet arranged on the inner wall of the rotating cylinder. The first magnet and the second magnet are arranged around the circumference of the rotating cylinder. The first magnet attracts the sliding gear, thereby driving the sliding gear to slide to the left, and the second magnet repels the sliding gear, thereby driving the sliding gear to slide to the right.

[0007] Furthermore, the sliding gear includes a first gear and a second gear fixedly connected, an intermediate gear is provided for rotating on the left side inside the rotating cylinder, a third gear and a fourth gear are provided on the intermediate gear, the third gear is engaged with the first gear, the fourth gear is engaged with the left ring gear, and the second gear is engaged with the right ring gear.

[0008] Furthermore, the inner wall of the rotating cylinder is provided with a coaxial arc-shaped protrusion, which is located on the right side of the driving member and the left side of the right gear ring, and a limiting ring groove is formed between the left side of the arc-shaped protrusion and the driving member, and between the right side of the arc-shaped protrusion and the right gear ring. A partition plate is provided between the first gear and the second gear, and the partition plate can slide along the limiting ring groove. The partition plate and the left and right side surfaces of the arc-shaped protrusion are both engaged along the axial direction of the rotating cylinder, and a first channel and a second channel are provided on the arc-shaped protrusion; in the axial direction of the rotating cylinder, the first channel is set corresponding to the first magnet, and the second channel is set corresponding to the second magnet.

[0009] Furthermore, the driving gear is arranged on the driving shaft through a first one-way bearing, and the first one-way bearing enables the driving gear to rotate only in one direction. The transmission shaft is arranged on the fixed shell through a second one-way bearing, and the second one-way bearing enables the transmission shaft to rotate only in one direction.

[0010] Furthermore, the sliding gear and the transmission shaft cooperate with each other through a keyway, so that the sliding gear and the transmission shaft rotate synchronously.

[0011] Furthermore, a hydraulic telescopic cylinder is provided at one end of the drive shaft, and the hydraulic telescopic cylinder is used to adjust the left and right position of the drive shaft.

[0012] Furthermore, along the axial direction of the rotating cylinder, the size of the sliding gear is smaller than the distance between the intermediate gear and the right ring gear.

[0013] Furthermore, each reversing switch includes a moving contact and a static contact. A crank mechanism is provided inside the fixed shell. The moving contact is located on the crank mechanism. A compression spring is connected to the crank mechanism. The compression spring has a tendency to make the moving contact contact with the static contact and close the circuit. The trigger block cooperates with the crank mechanism. The downward pressure of the trigger block can cause the crank mechanism to overcome the force of the compression spring and rotate, thereby disengaging the moving contact from the static contact.

[0014] Furthermore, a driving handle is provided at one end of the driving shaft, and the driving handle drives the driving shaft to rotate.

[0015] The beneficial effects of the present invention are: The present invention provides a phase-changing structure for a three-phase unbalanced circuit breaker. By rotating a drive shaft, the drive shaft can simultaneously drive two rotating cylinders to rotate, thereby causing two reversing switches to switch between open and closed states at the same time, avoiding the phenomenon of multiple phase lines being simultaneously connected or simultaneously disconnected, thereby ensuring the stable operation of the power system.

[0016] Second, the drive shaft can move left and right to switch between three different positions, so that each position of the drive shaft can drive two different rotating drums to rotate synchronously. In this way, different phases of the circuit can be switched according to power demand, making it easier to adjust the power supply.

[0017] Third, when the two reversing switches are switched on and off synchronously, one of them is closed to release the stored force of the corresponding compression spring, and the other is opened to compress the stored force of the compression spring. Since the two are carried out synchronously, the elastic forces of the compression springs offset each other, making the rotation of the drive shaft smoother and improving the switching speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-phase unbalanced circuit breaker according to an embodiment of the present invention; Figure 2 A schematic diagram of the internal structure of a three-phase unbalanced circuit breaker provided in one embodiment of the present invention; Figure 3 A schematic structural diagram of a commutation structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention; Figure 4 A schematic structural diagram of a fixed housing in a commutation structure for a three-phase unbalanced circuit breaker provided by one embodiment of the present invention; Figure 5 for Figure 4 A magnified view of the structure at center A; Figure 6 A partial structural diagram of a commutation structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention; Figure 7 A schematic diagram of the states of two rotating drums in a commutation structure for a three-phase unbalanced circuit breaker provided by one embodiment of the present invention; Figure 8 A schematic diagram of the coordination of a commutation structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention Figure 1 ; Figure 9 A schematic diagram of the coordination of a commutation structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention Figure 2; Figure 10 A schematic diagram of the coordination of a commutation structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention Figure 3 .

[0019] in: 100, circuit breaker housing; 200, terminal block; 300, hydraulic telescopic cylinder; 400, drive handle; 600, crank mechanism; 700, rotating cylinder; 710, trigger block; 711, limiting ring groove; 712, left ring gear; 713, right ring gear; 714, arc-shaped protrusion; 715, second magnet; 716, first magnet; 717, second channel; 718, first channel; 720, drive shaft; 721, drive gear; 722, first one-way bearing; 730, intermediate gear; 731 , fourth gear; 732, third gear; 740, transmission shaft; 741, smooth section; 742, gear section; 743, second one-way bearing; 744, first gear; 745, partition plate; 746, second gear; 747, spline; 748, retaining ring; 800, fixed shell; 840, limiting space; 841, first limiting groove; 842, second limiting groove; 843, avoidance groove; 844, first mounting hole; 845, second mounting hole; 846, third mounting hole; 900, compression spring. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0022] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0023] like Figures 1 to 2 As shown in FIG. 1 , a three-phase unbalanced circuit breaker provided in an embodiment of the present invention includes a circuit breaker housing 100. Four terminals 200 are provided on the circuit breaker housing 100, which are connected to three live wires and one neutral wire respectively. The three live wires correspond to a three-phase circuit. A phase switching structure is provided inside the circuit breaker housing 100. The phase switching structure is shown in FIG. Figures 3 to 10 As shown, a phase-changing structure for a three-phase unbalanced circuit breaker provided by an embodiment of the present invention includes a fixed housing 800, and three reversing switches are arranged in sequence inside the fixed housing 800, and the arrangement direction is defined as the left-right direction; each reversing switch corresponds to a phase circuit, and each reversing switch includes a trigger block 710, and the reversing switch can be opened and closed by rotating the trigger block 710. Each trigger block 710 is fixedly set on a rotating cylinder 700, and the axis of the rotating cylinder 700 is along the left-right direction. A transmission shaft 740 is rotatably provided inside each rotating cylinder 700, and a transmission sleeve is provided on the transmission shaft 740. The transmission sleeve includes two gear segments 742 and a smooth segment 741. The smooth segments 741 of the three transmission sleeves corresponding to the three reversing switches are in different positions.

[0024] A drive shaft 720 is rotatably provided on the fixed shell 800, and three drive gears 721 are provided on the drive shaft 720. The drive shaft 720 can move in the left and right directions so that the drive shaft 720 has three positions. In each position, two of the drive gears 721 on the drive shaft 720 are engaged with the gear segments 742 of two of the transmission gear sleeves, and the other drive gear 721 corresponds to the smooth segment 741 of the other transmission gear sleeve, so that the drive shaft 720 can synchronously drive the two transmission shafts 740 to rotate.

[0025] Each transmission shaft 740 is provided with a sliding gear that can slide in the left and right directions, and a left ring gear 712 and a right ring gear 713 are provided inside the rotating cylinder 700; the two transmission shafts 740 that cooperate with the drive shaft 720 for transmission, one sliding gear is located on the left and meshes with the left ring gear 712, and the other sliding gear is located on the right and meshes with the right ring gear 713. In one rotation stroke of the drive shaft 720, the two rotating cylinders 700 rotate in opposite directions at the same time, thereby causing the corresponding two reversing switches to switch on and off at the same time.

[0026] By rotating the drive shaft 720, the drive shaft 720 can simultaneously drive the two rotating cylinders 700 to rotate, thereby simultaneously switching the two reversing switches between open and closed states, preventing the occurrence of multiple phases being simultaneously conductive or non-conductive, thereby ensuring stable operation of the power system. The drive shaft 720 can also be moved left and right to switch between three different positions. Each position of the drive shaft 720 can drive two different rotating cylinders 700 to rotate synchronously. This allows switching between different phases of the circuit according to power demand, facilitating power supply adjustment.

[0027] Furthermore, a driving member is provided within the rotating cylinder 700. Rotation of the rotating cylinder 700 causes the driving member to drive the sliding gear to switch left and right positions. The sliding gear is magnetic, and the driving member comprises a first magnet 716 and a second magnet 715 disposed on the inner wall of the rotating cylinder 700. The first magnet 716 and the second magnet 715 are arranged circumferentially around the rotating cylinder 700. The first magnet 716 attracts the sliding gear, causing the sliding gear to slide leftward, while the second magnet 715 repels the sliding gear, causing the sliding gear to slide rightward. The first magnet 716 and the second magnet 715 are located to the right of the left ring gear 712.

[0028] Furthermore, the sliding gear includes a first gear 744 and a second gear 746 that are fixedly connected. An intermediate gear 730 is provided for rotation on the left side of the rotating cylinder 700. A third gear 732 and a fourth gear 731 are provided on the intermediate gear 730. The third gear 732 is engaged with the first gear 744, the fourth gear 731 is engaged with the left ring gear 712, and the second gear 746 is engaged with the right ring gear 713.

[0029] Furthermore, a coaxial arc-shaped protrusion 714 is provided on the inner wall of the rotating cylinder 700, and the arc-shaped protrusion 714 is located on the right side of the driving member and the left side of the right ring gear 713, and a limiting ring groove 711 is formed between the left side of the arc-shaped protrusion 714 and the driving member, and between the right side of the arc-shaped protrusion 714 and the right ring gear 713. A partition plate 745 is provided between the first gear 744 and the second gear 746, and the partition plate 745 can slide along the limiting ring groove 711. The partition plate 745 and the left and right side surfaces of the arc-shaped protrusion 714 are both axially stopped and cooperated with each other in the rotating cylinder 700. A first channel 718 and a second channel 717 are provided on the arc-shaped protrusion 714; in the axial direction of the rotating cylinder 700, the first channel 718 is arranged corresponding to the first magnet 716, and the second channel 717 is arranged corresponding to the second magnet 715.

[0030] Furthermore, the driving gear 721 is arranged on the driving shaft 720 through a first one-way bearing 722, and the first one-way bearing 722 enables the driving gear 721 to rotate only in one direction. The transmission shaft 740 is arranged on the fixed shell 800 through a second one-way bearing 743, and the second one-way bearing 743 enables the transmission shaft 740 to rotate only in one direction.

[0031] The fixed housing 800 is provided with a limiting space 840 corresponding to the three reversing switches. Limiting space 840 includes a first limiting groove 841 and a second limiting groove 842. The first limiting groove 841 is used to limit the trigger block 710, and the second limiting groove 842 is used to limit the rotating cylinder 700. The side walls of the limiting groove are respectively provided with an avoidance groove 843, a first mounting hole 844, a second mounting hole 845, and a third mounting hole 846. The avoidance groove 843 is used to avoid the drive shaft 720. One end of the transmission shaft 740 is rotatably mounted in the second mounting hole 845, and the other end is rotatably mounted in the first mounting hole 844 via a second one-way bearing 743. The intermediate gear 730 is rotatably mounted in the third mounting hole 846.

[0032] Furthermore, the sliding gear and the transmission shaft 740 cooperate through a keyway, so that the sliding gear and the transmission shaft 740 rotate synchronously. The inner wall of the sliding gear is provided with a keyway, and the transmission shaft 740 is provided with a spline 747. The left and right sides of the spline 747 are provided with a retaining ring 748 to limit the left and right displacement of the sliding gear.

[0033] Furthermore, a hydraulic telescopic cylinder 300 is provided at one end of the drive shaft 720, and the hydraulic telescopic cylinder 300 is used to adjust the left and right position of the drive shaft 720. In this way, the hydraulic telescopic cylinder 300 can be controlled to extend and retract according to the required switching of the reversing switch, so that the drive shaft 720 cooperates with the corresponding two rotating cylinders 700.

[0034] Furthermore, along the axial direction of the rotating cylinder 700, the size of the sliding gear is smaller than the distance between the intermediate gear 730 and the right ring gear 713. This prevents the sliding gear from being disengaged from the intermediate gear 730 and the right ring gear 713 at the same time, preventing the rotating cylinder 700 from rotating under the pushing action of the compression spring 900.

[0035] Furthermore, each reversing switch includes a moving contact and a stationary contact. A crank mechanism 600 is provided within the fixed housing 800. The moving contact is located on the crank mechanism 600. A compression spring 900 is connected to the crank mechanism 600. The compression spring 900 tends to cause the moving contact to contact the stationary contact, thereby closing the switch. The trigger block 710 cooperates with the crank mechanism 600. Depressing the trigger block 710 causes the crank mechanism 600 to rotate, overcoming the force of the compression spring 900, thereby disengaging the moving contact from the stationary contact. The crank mechanism 600 has the same structure as that in the prior art and will not be described in detail here.

[0036] Furthermore, a driving handle 400 is provided at one end of the driving shaft 720, and the driving handle 400 drives the driving shaft 720 to rotate. In this way, the reversing switch can be controlled by rotating the driving handle 400.

[0037] In combination with the above embodiments, the use principle and working process of the embodiments of the present invention are as follows: From left to right, the three reversing switches are defined as the first reversing switch, the second reversing switch and the third reversing switch. Figures 8 to 10 In the initial state, one of the first reversing switch and the third reversing switch is in the closed state, and the other is in the open state. The three driving gears 721 on the driving shaft 720 correspond to the gear segment 742 of the transmission gear sleeve of the first reversing switch, the smooth segment 741 of the transmission gear sleeve of the second reversing switch, and the gear segment 742 of the transmission gear sleeve of the third reversing switch, respectively. Therefore, the rotation of the driving shaft 720 can synchronously drive the first reversing switch and the third reversing switch to realize the switching between open and close. At this time, the second reversing switch is always in the open state.

[0038] When one of the first reversing switch and the second reversing switch is in the closed state and the other is in the open state, and the first reversing switch and the second reversing switch need to be switched between open and closed, the hydraulic telescopic cylinder 300 is controlled to drive the drive shaft 720 to move a certain distance to the right, so that the three drive gears 721 on the drive shaft 720 correspond to the gear segment 742 of the transmission gear sleeve of the first reversing switch, the gear segment 742 of the transmission gear sleeve of the second reversing switch, and the smooth segment 741 of the transmission gear sleeve of the third reversing switch, respectively. At this time, the third reversing switch is always in the open state.

[0039] When one of the second reversing switch and the third reversing switch is in the closed state and the other is in the open state, when it is necessary to switch the second reversing switch and the third reversing switch between open and closed, the hydraulic telescopic cylinder 300 is controlled to drive the drive shaft 720 to move a certain distance to the left, so that the three drive gears 721 on the drive shaft 720 correspond to the smooth section 741 of the transmission gear sleeve of the first reversing switch, the gear section 742 of the transmission gear sleeve of the second reversing switch, and the gear section 742 of the transmission gear sleeve of the third reversing switch, respectively. At this time, the first reversing switch is always in the open state.

[0040] Take the switching of two reversing switches as an example: In the initial state, if Figure 6 As shown, from left to right in the definition diagram are the first reversing switch and the second reversing switch. The first reversing switch is in the open state. The sliding gear in the first reversing switch is located at position d to the right of the arc-shaped protrusion 714 and meshes with the right ring gear 713. At this time, the sliding gear is attracted to the first magnet 716. The second reversing switch is in the closed state. The sliding gear in the second reversing switch is located at position h to the left of the arc-shaped protrusion 714 and meshes with the left ring gear 712 through the intermediate gear 730. At this time, the sliding gear is repelled by the second magnet 715.

[0041] First, the hydraulic telescopic cylinder 300 is used to control the drive shaft 720 to move left and right so that the drive teeth on the drive shaft 720 are simultaneously engaged with the gear segment 742 of the transmission gear sleeve in the first reversing switch and the gear segment 742 of the transmission gear sleeve in the second reversing switch.

[0042] Then manually or electrically push the driving handle 400 in the forward direction, driving the driving shaft 720 to rotate clockwise ( Figure 6 This rotational travel (seen from left to right in the figure) is just enough to open and close the reversing switch. Drive shaft 720 rotates drive gear 721 clockwise, simultaneously driving transmission shaft 740 in the first and second reversing switches counterclockwise. Transmission shaft 740 then drives the sliding gear counterclockwise.

[0043] The sliding gear in the first reversing switch first drives the rotating cylinder 700 to rotate counterclockwise (with a small rotation angle), causing the sliding gear to move from position d on the right side of the arc-shaped protrusion 714 to position e, and then, under the attraction of the first magnet 716, moves to position f on the left side of the arc-shaped protrusion 714. At this time, the sliding gear engages with the left ring gear 712 of the rotating cylinder 700 through the intermediate gear 730. Then, the continued rotation of the drive shaft 720 drives the rotating cylinder 700 to rotate clockwise (with a large rotation angle) through the sliding gear, causing the sliding gear to pass through position g and finally move to position h. At this time, the drive shaft 720 can no longer rotate, completing one rotation stroke, and the first reversing switch is closed.

[0044] At the same time, the sliding gear in the second reversing switch first drives the rotating cylinder 700 to rotate clockwise (with a small rotation angle), so that the sliding gear moves from position h on the left side of the arc-shaped protrusion 714 to position a, and then moves to position b on the right side of the arc-shaped protrusion 714 under the repulsive force of the second magnet 715. At this time, the sliding gear is engaged with the right ring gear 713 of the rotating cylinder 700. Then, the continued rotation of the driving shaft 720 will drive the rotating cylinder 700 to rotate counterclockwise (with a large rotation angle) through the sliding gear, so that the sliding gear passes position c and finally moves to position d. At this time, the driving shaft 720 can no longer rotate, completing a rotation stroke, and the second reversing switch is thus opened.

[0045] Closing the first reversing switch releases the stored force in compression spring 900, while opening the second reversing switch compresses and stores the force. Because these two actions occur simultaneously, the elastic forces of compression spring 900 offset each other, making the rotation of drive shaft 720 smoother and increasing switching speed. The time required to close the first reversing switch and open the second reversing switch is an integer multiple of the phase sequence, ensuring stable operation of the power system.

[0046] The next time you need to switch between opening and closing, first push the drive handle 400 in the reverse direction. At this time, due to the setting of the first one-way bearing 722, the drive shaft 720 will not drive the drive gear 721 and the transmission shaft 740 to rotate. Then push the drive handle 400 in the forward direction to rotate a stroke, and the drive shaft 720 will drive the drive gear 721 and the transmission shaft 740 to rotate again, thereby realizing the opening and closing operations of the two reversing switches.

[0047] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A commutation structure for a three-phase unbalanced circuit breaker, characterized in that: It comprises a fixed shell, three reversing switches are arranged in sequence inside the fixed shell, and the arrangement direction is defined as the left-right direction; each reversing switch corresponds to a phase circuit respectively, each reversing switch comprises a trigger block, and the reversing switch can be opened and closed by rotating the trigger block, each trigger block is fixedly arranged on a rotating cylinder, the axis of the rotating cylinder is along the left-right direction, a transmission shaft is rotatably arranged inside each rotating cylinder, a transmission gear sleeve is arranged on the transmission shaft, the transmission gear sleeve comprises two gear sections and a smooth section, and the smooth sections of the three transmission gear sleeves corresponding to the three reversing switches are in different positions; A drive shaft is rotatably provided on the fixed shell, and three drive gears are provided on the drive shaft. The drive shaft can move in the left and right directions so that the drive shaft has three positions, and at each position, two of the drive gears on the drive shaft are meshed with the gear segments of two of the transmission gear sleeves, and another drive gear corresponds to the smooth segment of another transmission gear sleeve, so that the drive shaft can synchronously drive the two transmission shafts to rotate; Each transmission shaft is provided with a sliding gear that can slide in the left and right directions, and a left gear ring and a right gear ring are provided inside the rotating cylinder; the two transmission shafts that cooperate with the drive shaft transmission, the sliding gear on one transmission shaft is located on the left and meshes with the left gear ring, and the sliding gear on the other transmission shaft is located on the right and meshes with the right gear ring. In a rotation stroke of the drive shaft, the two rotating cylinders rotate in opposite directions at the same time, thereby causing the corresponding two reversing switches to switch on and off at the same time.

2. The phase-changing structure for a three-phase unbalanced circuit breaker according to claim 1, characterized in that: A driving member is provided inside the rotating cylinder. The rotation of the rotating cylinder can enable the driving member to drive the sliding gear to switch left and right positions. The sliding gear is magnetic. The driving member is a first magnet and a second magnet arranged on the inner wall of the rotating cylinder. The first magnet and the second magnet are arranged around the circumference of the rotating cylinder. The first magnet attracts the sliding gear to drive the sliding gear to slide to the left, and the second magnet repels the sliding gear to drive the sliding gear to slide to the right.

3. The phase-changing structure for a three-phase unbalanced circuit breaker according to claim 2, characterized in that: The sliding gear includes a first gear and a second gear that are fixedly connected. An intermediate gear is provided for rotation on the left side of the rotating cylinder. A third gear and a fourth gear are provided on the intermediate gear. The third gear is meshed with the first gear, the fourth gear is meshed with the left gear ring, and the second gear is meshed with the right gear ring.

4. The phase-changing structure for a three-phase unbalanced circuit breaker according to claim 3, characterized in that: The inner wall of the rotating cylinder is provided with a coaxial arc-shaped protrusion, which is located on the right side of the driving member and the left side of the right gear ring, and a limiting ring groove is formed between the left side of the arc-shaped protrusion and the driving member, and between the right side of the arc-shaped protrusion and the right gear ring. A partition plate is provided between the first gear and the second gear, and the partition plate can slide along the limiting ring groove. The partition plate and the left and right side surfaces of the arc-shaped protrusion are both engaged in the axial stop along the rotating cylinder, and a first channel and a second channel are provided on the arc-shaped protrusion; in the axial direction of the rotating cylinder, the first channel is set corresponding to the first magnet, and the second channel is set corresponding to the second magnet.

5. The phase-changing structure for a three-phase unbalanced circuit breaker according to claim 1, characterized in that: The driving gear is arranged on the driving shaft through a first one-way bearing, and the first one-way bearing enables the driving gear to rotate only in one direction. The transmission shaft is arranged on the fixed shell through a second one-way bearing, and the second one-way bearing enables the transmission shaft to rotate only in one direction.

6. The phase-changing structure for a three-phase unbalanced circuit breaker according to claim 5, characterized in that: The sliding gear and the transmission shaft are matched through a keyway, so that the sliding gear and the transmission shaft rotate synchronously.

7. The phase-changing structure for a three-phase unbalanced circuit breaker according to claim 1, characterized in that: A hydraulic telescopic cylinder is provided at one end of the driving shaft, and the hydraulic telescopic cylinder is used to adjust the left and right position of the driving shaft.

8. The phase-changing structure for a three-phase unbalanced circuit breaker according to claim 3, characterized in that: Along the axial direction of the rotating drum, the size of the sliding gear is smaller than the distance between the intermediate gear and the right gear ring.

9. The phase-changing structure for a three-phase unbalanced circuit breaker according to claim 1, characterized in that: Each reversing switch includes a moving contact and a stationary contact. A crank mechanism is provided inside the fixed shell. The moving contact is located on the crank mechanism. A compression spring is connected to the crank mechanism. The compression spring has a tendency to make the moving contact contact with the stationary contact to close the switch. The trigger block cooperates with the crank mechanism. The downward pressure of the trigger block can make the crank mechanism overcome the force of the compression spring and rotate, thereby disengaging the moving contact from the stationary contact.

10. The phase-changing structure for a three-phase unbalanced circuit breaker according to claim 1, characterized in that: A driving handle is provided at one end of the driving shaft, and the driving handle drives the driving shaft to rotate.

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