A phase-changing structure for three-phase unbalanced circuit breaker

Abstract

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, comprising a fixed shell, wherein three reversing switches are arranged in sequence in the left-right direction inside the fixed shell, each reversing switch comprises a trigger block, each trigger block is fixedly arranged on a rotating cylinder, a transmission shaft is rotatably arranged inside each rotating cylinder, each transmission shaft is provided with a transmission gear sleeve, each transmission gear sleeve comprises two gear segments and a smooth segment, a driving shaft is rotatably arranged on the fixed shell, three driving gears are provided on the driving shaft, the driving shaft can move in the left-right direction so that the driving shaft has three positions, each position makes two of the driving gears on the driving shaft mesh with the gear segments of two of the transmission gear sleeves, and another driving gear corresponds to the smooth segment of another transmission gear sleeve, and the rotation of the driving shaft can make the two rotating cylinders rotate simultaneously, thereby making two of the reversing switches switch on and off simultaneously.

Description

Technical Field

[0001] The 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 the power distribution system, long-term three-phase imbalance will aggravate the thermal stress of electrical equipment, increase the burden of equipment, and may cause insulation aging, shortened life and other problems, so it is very important to maintain three-phase balance. In the prior art, a three-phase unbalanced circuit breaker is usually set to achieve three-phase balance.

[0003] When the three-phase unbalanced circuit breaker is working, different reversing switches need to be switched to realize the distribution of electric energy. However, when the reversing switches are switched, multi-phase lines may be turned on or off at the same time, resulting in line failure. Summary of the invention

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

[0005] The above purpose is achieved through the following technical solutions:

[0006] A phase-changing structure for a three-phase unbalanced circuit breaker comprises a fixed shell, wherein three reversing switches are sequentially arranged inside the fixed shell, and the arrangement direction is defined as the left-right direction; each reversing switch corresponds to a phase circuit respectively, and each reversing switch comprises a trigger block, and the opening and closing of the reversing switch can be realized by rotating the trigger block, and each trigger block is fixedly arranged on a rotating cylinder, and the axis of the rotating cylinder is along the left-right direction, and a transmission shaft is rotatably arranged inside each rotating cylinder, and a transmission gear sleeve is arranged on the transmission shaft, and 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;

[0007] 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;

[0008] 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.

[0009] 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 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.

[0010] Furthermore, 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 inside 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 ring gear, and the second gear is meshed with the right ring gear.

[0011] Furthermore, a coaxial arc-shaped protrusion is provided on the inner wall of the rotating cylinder, and the arc-shaped protrusion 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.

[0012] 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.

[0013] 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.

[0014] Furthermore, 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.

[0015] 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 gear ring.

[0016] Furthermore, 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 and close the switch, the trigger block cooperates with the crank mechanism, and 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.

[0017] Furthermore, a driving handle is provided at one end of the driving shaft, and the driving handle drives the driving shaft to rotate.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a phase-changing structure for a three-phase unbalanced circuit breaker. By rotating a driving shaft, the driving 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, thereby avoiding the phenomenon that multiple phase lines are simultaneously turned on or off, thereby ensuring the stable operation of the power system.

[0020] 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 cylinders to rotate synchronously. In this way, different phases of the circuit can be switched according to power demand, which facilitates power supply adjustment.

[0021] 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 increasing the switching speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the three-phase structure of a three-phase unbalanced circuit breaker provided in one embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the internal structure of a three-phase unbalanced circuit breaker provided in one embodiment of the present invention;

[0024] Figure 3 A schematic structural diagram of a phase-changing structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention;

[0025] Figure 4 A schematic structural diagram of a fixed shell in a phase-changing structure for a three-phase unbalanced circuit breaker provided by an embodiment of the present invention;

[0026] Figure 5 for Figure 4 A magnified view of the structure at center;

[0027] Figure 6 A partial structural schematic diagram of a phase-changing structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the states of two rotating cylinders in a commutation structure for a three-phase unbalanced circuit breaker provided by an embodiment of the present invention;

[0029] Figure 8 A schematic diagram of the phase-changing structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention Figure 1 ;

[0030] Fig. 9 A schematic diagram of the phase-changing structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention Figure 2 ;

[0031] Fig.10 A schematic diagram of the phase-changing structure for a three-phase unbalanced circuit breaker provided in one embodiment of the present invention Figure 3 .

[0032] in:

[0033] 100, circuit breaker housing; 200, terminal; 300, hydraulic telescopic cylinder; 400, driving handle; 600, crank mechanism; 700, rotating cylinder; 710, trigger block; 711, limiting ring groove; 712, left gear ring; 713, right gear ring; 714, arc-shaped protrusion; 715, second magnet; 716, first magnet; 717, second channel; 718, first channel; 720, driving shaft; 721, driving 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

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is 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 used to limit the present invention.

[0035] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] like Figure 1 to Figure 2 As shown in FIG. 1 , a three-phase unbalanced circuit breaker provided in one embodiment of the present invention includes a circuit breaker housing 100, on which four terminals 200 are respectively connected to three live wires and one neutral wire, the three live wires corresponding to the three-phase circuit, and 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 shell 800, and three reversing switches are arranged in sequence inside the fixed shell 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, and the smooth segments 741 of the three transmission sleeves corresponding to the three reversing switches are in different positions.

[0038] 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.

[0039] Each transmission shaft 740 is provided with a sliding gear that can slide in the left and right directions, and the rotating cylinder 700 is provided with a left ring gear 712 and a right ring gear 713 inside; 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 a rotation stroke of the drive shaft 720, the two rotating cylinders 700 rotate in opposite directions at the same time, so that the corresponding two reversing switches are switched on and off at the same time.

[0040] In this way, by rotating the drive shaft 720, the drive shaft 720 can simultaneously drive two of the rotating cylinders 700 to rotate, so that two of the reversing switches can switch the opening and closing states at the same time, avoiding the phenomenon that multiple phase lines are simultaneously turned on or off, and ensuring the stable operation of the power system. At the same time, the drive shaft 720 can move left and right to switch three different positions, so that each position of the drive shaft 720 can drive two different rotating cylinders 700 to rotate synchronously, so that different phases of the circuit can be switched according to the power demand, which is convenient for power supply adjustment.

[0041] Furthermore, a driving member is provided inside the rotating cylinder 700. The rotation of the rotating cylinder 700 can cause the driving member to drive the sliding gear to switch left and right positions. The sliding gear has magnetism. The driving member is a first magnet 716 and a second magnet 715 provided on the inner wall of the rotating cylinder 700. The first magnet 716 and the second magnet 715 are provided around the circumference of the rotating cylinder 700. The first magnet 716 attracts the sliding gear to drive the sliding gear to slide to the left, and the second magnet 715 repels the sliding gear to drive the sliding gear to slide to the right. The first magnet 716 and the second magnet 715 are located on the right side of the left gear ring 712.

[0042] 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 inside 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 meshed with the first gear 744, the fourth gear 731 is meshed with the left ring gear 712, and the second gear 746 is meshed with the right ring gear 713.

[0043] 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 gear ring 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 gear ring 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 sides of the arc-shaped protrusion 714 are both axially stopped and cooperated with each other along 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.

[0044] 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.

[0045] The fixed shell 800 is provided with a limiting space 840 corresponding to the three reversing switches. The 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 driving shaft 720. One end of the transmission shaft 740 is rotatably set in the second mounting hole 845, and the other end is rotatably set in the first mounting hole 844 through a second one-way bearing 743. The intermediate gear 730 is rotatably set in the third mounting hole 846.

[0046] 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, and the left and right sides of the spline 747 are provided with a retaining ring 748, so as to limit the left and right displacement of the sliding gear.

[0047] Furthermore, a hydraulic telescopic cylinder 300 is provided at one end of the driving shaft 720, and the hydraulic telescopic cylinder 300 is used to adjust the left and right position of the driving shaft 720. In this way, the hydraulic telescopic cylinder 300 can be controlled to be telescopic according to the reversing switch to be switched as needed, so that the driving shaft 720 cooperates with the corresponding two rotating cylinders 700.

[0048] Furthermore, along the axial direction of the rotating cylinder 700, the size of the sliding gear is smaller than the distance between the middle gear 730 and the right gear ring 713. This prevents the sliding gear from being disengaged from the middle gear 730 and the right gear ring 713 at the same time, and prevents the rotating cylinder 700 from rotating under the pushing action of the compression spring 900.

[0049] Furthermore, each reversing switch includes a moving contact and a stationary contact, a crank mechanism 600 is provided inside the fixed shell 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 has a tendency to make the moving contact contact with the stationary contact to close the switch, the trigger block 710 cooperates with the crank mechanism 600, and the downward pressure of the trigger block 710 can make the crank mechanism 600 overcome the force of the compression spring 900 and rotate, thereby separating the moving contact from the stationary contact. The crank mechanism 600 has the same structure as that in the prior art and is not described in detail here.

[0050] 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.

[0051] In combination with the above embodiments, the use principle and working process of the embodiments of the present invention are as follows:

[0052] 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 opening and closing switching. At this time, the second reversing switch is always in the open state.

[0053] 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.

[0054] 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 the second reversing switch and the third 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 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.

[0055] Take the switching of two reversing switches as an example:

[0056] 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, wherein the first reversing switch is in the open state, the sliding gear in the first reversing switch is located at the right side d position of the arc-shaped protrusion 714 and meshes with the right gear ring 713, at which 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 the left side h position of the arc-shaped protrusion 714 and meshes with the left gear ring 712 through the intermediate gear 730, at which time the sliding gear is repelled from the second magnet 715.

[0057] First, the driving shaft 720 is controlled to move left and right by the hydraulic telescopic cylinder 300 so that the driving teeth on the driving shaft 720 are meshed 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 at the same time.

[0058] Then, the driving handle 400 is pushed forward manually or electrically to drive the driving shaft 720 to rotate clockwise ( Figure 6 The driving shaft 720 causes the driving gear 721 to rotate clockwise, and at the same time drives the transmission shaft 740 in the first reversing switch and the second reversing switch to rotate counterclockwise, and the transmission shaft 740 drives the sliding gear to rotate counterclockwise.

[0059] The sliding gear in the first reversing switch first drives the rotating cylinder 700 to rotate counterclockwise (with a small rotation angle), so that the sliding gear moves from the d position on the right side of the arc-shaped protrusion 714 to the e position, and then moves to the f position on the left side of the arc-shaped protrusion 714 under the attraction of the first magnet 716. At this time, the sliding gear is engaged with the left ring gear 712 of the rotating cylinder 700 through the intermediate gear 730, and then the continued rotation of the driving shaft 720 will drive the rotating cylinder 700 to rotate clockwise (with a large rotation angle) through the sliding gear, so that the sliding gear passes the g position and finally moves to the h position. At this time, the driving shaft 720 cannot continue to rotate, completing a rotation stroke, so that the first reversing switch is closed.

[0060] 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 the left side h position of the arc-shaped protrusion 714 to the a position, and then moves to the right side b position 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 gear ring 713 of the rotating cylinder 700, and 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 the c position and finally moves to the d position. At this time, the driving shaft 720 cannot continue to rotate, completing a rotation stroke, so that the second reversing switch is opened.

[0061] Closing the first reversing switch releases the stored force of the corresponding compression spring 900, and opening the second reversing switch compresses and stores the force of the compression spring 900. Since the two are performed synchronously, the elastic forces of the compression spring 900 offset each other, making the rotation of the drive shaft 720 smoother and improving the switching speed. The time required for closing the first reversing switch and opening the second reversing switch is equal to an integer multiple of the phase sequence, thus ensuring the stable movement of the power system.

[0062] The next time you need to switch the opening and closing of the switch, first push the driving handle 400 in the reverse direction. At this time, due to the setting of the first one-way bearing 722, the driving shaft 720 will not drive the driving gear 721 and the transmission shaft 740 to rotate. Then push the driving handle 400 in the forward direction to rotate a stroke, and the driving shaft 720 will drive the driving gear 721 and the transmission shaft 740 to rotate again, thereby realizing the opening and closing operations of the two reversing switches.

[0063] The technical features of the above embodiments may be arbitrarily combined. 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.

[0064] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached 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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