CN113539708A - Phase-change switch - Google Patents

Abstract

The invention discloses a phase change switch which comprises an insulating shell, a power supply inlet wire end, a power supply outlet wire end, at least one moving contact and at least two fixed contacts, wherein the power supply inlet wire end comprises a first power supply inlet wire end and a second power supply inlet wire end, the power supply outlet wire end comprises a first power supply outlet wire end and a second power supply outlet wire end, the second power supply inlet wire end is electrically connected with the second power supply outlet wire end through the fixed contacts and the moving contacts, the first power supply inlet wire end is directly and electrically connected with the first power supply outlet wire end, and the first power supply outlet wire end and the second power supply outlet wire end are mutually insulated. According to the invention, one power supply outlet end is directly connected with one power supply inlet end, so that only partial current can be converted during phase conversion, and the balance of phase current can be achieved.

Description

Phase-change switch

Technical Field

The invention relates to the field of low-voltage appliances, in particular to a phase change switch applied to three-phase load unbalance.

Background

In the current low-voltage distribution three-phase four-wire system power grid in China, single-phase loads account for most, the single-phase loads have serious three-phase current imbalance problems due to large irregularity of practical application conditions and time distribution, single-phase current or overlarge central line is easily caused, copper loss and iron loss of a circuit and a transformer are increased, overload or short circuit of the circuit is caused, even fire accidents caused by high-temperature ignition of a cable are caused, and power supply safety is not facilitated.

As a typical application for solving the problem of three-phase imbalance, a phase-change switch has been increasingly applied, and the existing phase-change switch for three-phase incoming line and one-phase outgoing line mostly adopts three electromagnets to drive three sets of moving and static contacts, as shown in a patent 201610916682.X shown in fig. 1, the switch disclosed in the patent adopts three electromagnets and three sets of moving and static contacts to realize three-way incoming line and one-way outgoing line phase change; as shown in fig. 2, chinese patent 201821456019.7 discloses that an electromagnet is used to drive a rotary plug-in contact to implement three-way incoming line and one-way outgoing line phase change, when the two patents perform phase change, the full current of a phase line is switched to another phase line, and this switching manner often causes an excessive current of another phase line, resulting in new current imbalance, which is not favorable for the balanced switching of three-phase currents of a system; in the case of three-phase load, such as a three-phase motor, the full current switching of the two patents will cause the phase sequence of the motor to change, which will cause the motor to rotate reversely or stop rotating, so that the motor generates heat, and at the same time, mechanical and electrical impact is brought to cause the motor to break the shaft and burn, and if serious, equipment damage and production economic loss will be brought.

Disclosure of Invention

Against this background, it is an object of the present invention to provide a commutation switch that effectively overcomes the above-mentioned problems.

The invention is realized by the following technical scheme:

a phase change switch comprises an insulating shell, a power supply inlet wire end, a power supply outlet wire end, at least one moving contact and at least two fixed contacts, wherein the power supply inlet wire end comprises a first power supply inlet wire end and a second power supply inlet wire end, the power supply outlet wire end comprises a first power supply outlet wire end and a second power supply outlet wire end, the second power supply inlet wire end is electrically connected with the second power supply outlet wire end through the fixed contacts and the moving contacts, the first power supply inlet wire end is directly and electrically connected with the first power supply outlet wire end, and the first power supply outlet wire end and the second power supply outlet wire end are mutually insulated.

Preferably, the first power supply inlet end is electrically connected with the first power supply outlet end through a first conductive member, and the first conductive member is arranged inside or outside the insulating shell.

Preferably, the phase change switch further comprises at least one electric driving device, and the electric driving device comprises an energy storage mechanism, a transmission mechanism and a power device.

Preferably, the power device is an electric motor or an electromagnetic mechanism.

Preferably, the commutation switch is provided with at least one electronic controller.

Preferably, the phase change switch is provided with a wired or wireless communication module.

Preferably, the commutation switch is provided with at least one current sensor and/or at least one voltage acquisition module.

Preferably, the moving contact is of a single-breakpoint type or a double-breakpoint type.

Preferably, the phase change switch is provided with a manual operating mechanism.

Preferably, the manual operating mechanism comprises a dial and a handle.

Preferably, the load values borne by the first power outlet terminal and the second power outlet terminal are increased or decreased according to the load requirements.

Preferably, one or more paths of non-through power supplies of the phase change switch can switch 220V voltage; the through power supply of the commutation switch can switch 380V or 220V voltage.

The invention has the following beneficial effects:

1. the invention completes automatic phase change by arranging one path of power supply outlet end to be directly communicated with one path of power supply inlet end, and the other path of power supply outlet end to be communicated with and disconnected from a plurality of paths of power supply inlet ends through the movable and static contacts, thereby automatically completing the three-phase balance of current;

2. according to the invention, by arranging the two power supply outlet ends, the load distribution can be adjusted according to actual requirements, and the loads under the two power supply outlet ends are manually installed and adjusted, so that the load distribution of the two power supply outlet ends in different proportions is realized, on one hand, the three-phase balance of current can be manually completed, on the other hand, only part of current can be converted during phase change, the problem of overload of the other phase current caused by switching of all current is effectively avoided, and the phase-to-phase current balance is more favorably realized;

3. when the phase change switch is provided with three power supply switching devices, a through power supply arranged on each power supply switching device can be respectively set to be A, B, C different phases of a three-phase power supply, the phase change switch can be used for three-phase loads such as a three-phase motor and the like, and the through A, B, C can not act to change the phase sequence during phase change action, so that the problems of motor reversal and the like caused by the phase change action of the three-phase load after the phase sequence is changed are avoided, and the three-phase load can still normally work during the phase change action.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a prior art embodiment.

Fig. 2 is a schematic structural diagram of another prior art embodiment.

Fig. 3 is a schematic diagram of the overall layout of the commutation switch of the present invention.

Fig. 4 is a schematic diagram of the overall layout of the commutation switch provided with the transfer bar.

Fig. 5 is a schematic diagram of the internal structure of the single pole of the commutation switch of the present invention.

Fig. 6 is a schematic diagram of a driving structure of the phase change switch according to the present invention.

Fig. 7 is a schematic structural view of a connection mode between an energy storage unit and a moving contact of the phase change switch according to the present invention.

Fig. 8 is a schematic structural view of a manual operating mechanism of the phase change switch of the present invention.

Fig. 9 is a schematic diagram of an electromagnet driving structure of the phase change switch of the present invention.

Fig. 10 is a schematic structural view of another manual operating mechanism of the phase change switch of the present invention.

Fig. 11 is a schematic view of a movable contact structure of the phase change switch of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration set forth below, but rather covers any modification, replacement or improvement of elements, parts or the like without departing from the spirit of the present invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.

For ease of description, the length, width and height directions referred to hereinafter correspond to the directions Z, X and Y shown in fig. 3 or 4, respectively, it is noted that the above-indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "first", "second", and "third", etc., are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless otherwise stated.

It should be noted that the following references to orientations and positional relationships are based on the orientations and positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but do not refer to or imply that the referenced devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As shown in fig. 3 and fig. 4, the present invention discloses a phase-change switch 100, the phase-change switch 100 includes one or more power switching devices, in this embodiment, the number of the power switching devices is three, the power switching devices include a first power switching device 200, a second power switching device 300, and a third power switching device 400, the first power switching device 200, the second power switching device 300, and the third power switching device 400 are sequentially arranged along the width direction of the phase-change switch 100, i.e. the X-axis direction shown in fig. 3, and the first power switching device 200, the second power switching device 300, and the third power switching device 400 have the same structure, the power switching devices further include a power inlet terminal 500 and a power outlet terminal 600, the power inlet terminal 500 includes a power inlet terminal 510, a power inlet terminal 520, and a power outlet terminal 530, the power line outlet end 600 includes a power line outlet end 610, a power line outlet end 620 and a power line outlet end 630, the power line inlet end 510 and the power line outlet end 610 correspond to the first power switching device 200, the power line inlet end 520 and the power line outlet end 620 correspond to the second power switching device 300, and the power line inlet end 530 and the power line outlet end 630 correspond to the third power switching device 400. The power outlet terminal 610, the power outlet terminal 620, and the power outlet terminal 630 have the same structure, and the power inlet terminal 510, the power inlet terminal 520, and the power inlet terminal 530 have the same structure, it should be noted that the phase change switch 100 may include one or more power switching devices, not limited to three, in this embodiment, the number of the power switching devices is three, and the structures of the power switching devices are the same. The commutation switch will be described in detail below by taking the first power switching device 200 as an example.

Specifically, referring to fig. 3, 4 and 5, the first power switching device 200 is provided with an insulating housing 210, a power inlet terminal 510, a power outlet terminal 610, at least one movable contact 220, at least two fixed contacts 230, at least one electric driving device 240, and at least one electronic controller 250, wherein the movable contact 220, the fixed contacts 230, the electric driving device 240, and the electronic controller 250 are all disposed in the insulating housing 210, the power inlet terminal 510 includes a first power inlet terminal 510A and a second power inlet terminal 510B, the first power inlet terminal 510A and the second power inlet terminal 510B respectively correspond to the phase a and the phase B, the power outlet terminal 610 includes a first power outlet terminal 610A, the first power inlet terminal 510A and the second power inlet terminal 510B of the power inlet terminal 510 are sequentially and longitudinally arranged along a height direction of the phase change switch 100, that is, i.e., a Y-axis direction shown in fig. 3 or 4, and the power line inlet ends of the corresponding phases of the adjacent power switching devices are correspondingly and sequentially arranged along the width direction of the phase change switch 100, i.e., the X-axis direction shown in fig. 3 or fig. 4, and the power line inlet ends or the power line outlet ends of the corresponding phases of the adjacent power switching devices are respectively insulated from each other. It should be noted that, in other embodiments, the corresponding phase of the first power line inlet 510A and the second power line inlet 510B may be other phases, such as: the first power line inlet 510A may correspond to phase B or phase C, and the second power line inlet 510B may correspond to phase a or phase C.

Specifically, as shown in fig. 4, in this embodiment, the first power line inlet end 510A of the power line inlet end 510, the fourth power line inlet end 520A of the power line inlet end 520, and the seventh power line inlet end 530A of the power line inlet end 530 are correspondingly and sequentially arranged along the width direction of the phase change switch 100 and are connected in parallel with each other, and the second power line inlet end 510B of the power line inlet end 510, the fifth power line inlet end 520B of the power line inlet end 520, and the eighth power line inlet end 530B of the power line inlet end 530 are sequentially arranged along the width direction of the phase change switch 100 and are connected in parallel with each other.

Further, in this embodiment, the power line inlet end 510 further includes a third power line inlet end 510C, the power line inlet end 520 further includes a sixth power line inlet end 520C, the power line inlet end 530 further includes a ninth power line inlet end 530C, the third power line inlet end 510C, the sixth power line inlet end 520C and the ninth power line inlet end 530C respectively correspond to the C-phase of the corresponding power switching device, the third power line inlet end 510C, the sixth power line inlet end 520C and the ninth power line inlet end 530C are connected in parallel, the third power line inlet end 510C, the sixth power line inlet end 520C and the ninth power line inlet end 530C are sequentially arranged in the width direction of the phase change switch 100, the first power line inlet end 510A, the second power line inlet end 510B and the third power line inlet end 510C are sequentially and longitudinally arranged in the height direction of the phase change switch 100, that is, the Y-axis direction, the fourth power line inlet end 520A, the fifth power line inlet end 520B, and the sixth power line inlet end 520C are sequentially and longitudinally arranged along the height direction of the phase change switch 100, i.e., the Y-axis direction, and the seventh power line inlet end 530A, the eighth power line inlet end 530B, and the ninth power line inlet end 530C are sequentially and longitudinally arranged along the height direction of the phase change switch 100, i.e., the Y-axis direction. Namely: the phase a, the phase B and the phase C of the power line inlet end 510, the power line inlet end 520 or the power line inlet end 530 are respectively and sequentially and longitudinally arranged along the height direction of the phase change switch 100, and the phase a of the power line inlet end 510, the power line inlet end 520 and the power line inlet end 530, the phase B of the power line inlet end 510, the power line inlet end 520 and the power line inlet end 530, the phase C of the power line inlet end 510, the power line inlet end 520 and the power line inlet end 530 are respectively and correspondingly arranged along the width direction of the phase change switch 100. At this time, the power outlet terminal 600 further includes a second power outlet terminal 610B.

Of course, in other possible embodiments, the first power switching device 200, the second power switching device 300, and the third power switching device 400 may also be sequentially assembled along the length direction of the phase change switch 100, i.e., the Z-axis direction shown in fig. 3 or 4, or the height direction, i.e., the Y-axis direction shown in fig. 3 or 4; in this embodiment, the first power switching device 200, the second power switching device 300, and the third power switching device 400 are sequentially disposed in the width direction of the phase change switch 100, compared to being disposed in the length direction or the height direction of the phase change switch 100, the advantage of such an arrangement is that the width dimension of the entire commutation switch is minimized when the first power switching device 200, the second power switching device 300 and the third power switching device 400 are assembled in the width direction in sequence, and the height is not more than 115mm, and a plurality of power switching devices are spliced along the width direction, and compared with the arrangement of the plurality of power switching devices along other directions, the transverse size is minimum, the easiest arrangement mode of phase and parallel connection is realized, the occupied cabinet body space is minimum, the cabinet body does not need to be redesigned, the phase change switch is small in size, the material consumption is small, and the cost is reduced.

The phase change switch 100 may be integrated, that is, the first power switching device 200, the second power switching device 200, and the third power switching device 400 are disposed in the same insulating housing and insulated from each other, so that the same technical effects can be achieved, which is not limited herein.

Further, a connection row 700 is further arranged outside the phase change switch 100, the connection row 700 includes an a-phase connection row 710, a B-phase connection row 720 and a C-phase connection row 730, the a-phase connection row 710 is connected to the first power line inlet end 510A, the fourth power line inlet end 520A and the seventh power line inlet end 530A, the B-phase connection row 720 is connected to the second power line inlet end 510B, the fifth power line inlet end 520B and the eighth power line inlet end 530B, and the C-phase connection row 730 is connected to the third power line inlet end 510C, the sixth power line inlet end 520C and the ninth power line inlet end 530C, so that parallel connection of corresponding phase poles of adjacent power switching devices is achieved.

The external of the connection bar 700 is further connected with a switching bar 800, the switching bar 800 includes an a-phase switching bar 810, a B-phase switching bar 820 and a C-phase switching bar 830, one end of the a-phase switching bar 810 is electrically connected with the a-phase switching bar 710, one end of the B-phase switching bar 820 is electrically connected with the B-phase switching bar 720, one end of the C-phase switching bar 830 is electrically connected with the C-phase connection bar 730, and the other ends of the a-phase switching bar 810, the B-phase switching bar 820 and the C-phase switching bar 830 are respectively connected to a superior phase line.

With continued reference to fig. 3, the following description will proceed to the structure of each component by taking the first power switching device 200 as an example. In the first power switching device 200, a first conductive member 260 is disposed, one end of the first conductive member 260 is connected to any incoming line terminal of the power incoming line terminal 510, and the other end is connected to any outgoing line terminal of the power outgoing line terminal 610, in this embodiment, one end of the first conductive member 260 is electrically connected to the first power incoming line terminal 510A, and the other end is connected to the first power outgoing line terminal 610A, so as to implement direct current connection of one pole in the first power switching device 200, such arrangement has the advantage that one path of power outgoing line terminal is connected to one path of power incoming line terminal, the other path of power outgoing line terminal is connected to and disconnected from multiple paths of power incoming line terminals through moving and static contacts, thereby implementing phase change, and load values carried by the first power outgoing line terminal 610A and the second power outgoing line terminal 610B can be increased or decreased according to load requirements, for example, in a power distribution system of an actual distribution area, 5 household electric meters are installed on each of the first power outlet terminal 610A and the second power outlet terminal 610B, assuming that power consumption load power of each household is the same, 50% load current is carried by each of the first power outlet terminal 610A and the second power outlet terminal 610B, if load distribution needs to be adjusted, the first power outlet terminal 610A may be manually adjusted to install 2 household electric meters, and the second power outlet terminal 610B may be adjusted to install 8 household electric meters, so that 20% load current is carried by the first power outlet terminal 610A, and the remaining 80% load current is carried by the second power outlet terminal 610B, or of course, other load-carrying proportions may be used, and the load may be adjusted according to actual requirements. According to the arrangement, on one hand, the three-phase balance of current can be manually completed, on the other hand, only partial current can be converted during phase change, the problem of overload of the other phase current caused by switching of all the currents is effectively avoided, and the phase-to-phase current balance is more favorably achieved. When the other one or more paths of non-straight-through power supplies of the phase change switch 100 are matched with a neutral line or a zero line of a power distribution system for use, 220V voltage can be output; in addition, when the phase change switch 100 is provided with three power switching devices, one path of direct power provided on each power switching device can be respectively set to be different phases of a three-phase power, for example, when the direct power of the first power switching device 200 corresponds to a phase a, the direct power of the second power switching device 300 and the third power switching device 400 corresponds to a phase B and a phase C, respectively, and the direct power of the second power switching device 300 and the third power switching device 400 cannot correspond to the same phase, at this time, the direct power of the first power switching device 200, the second power switching device 300 and the third power switching device 400 can output a voltage of 380V in common; when any one of the first power switching device 200, the second power switching device 300 and the third power switching device 400 is used with a neutral line or a neutral line of a power distribution system, 220V voltage can be output; similarly, the arrangement mode can be used for three-phase loads such as a three-phase motor and the like, and the through A, B, C cannot act to change the phase sequence during the phase change action, so that the problems of motor reversal and the like caused by the phase change action of the three-phase load after the phase sequence is changed are avoided, and the three-phase load still works normally during the phase change action.

In this embodiment, the first conductive member 260 is disposed inside the insulating housing 210, but the first conductive member 260 may be disposed outside the insulating housing 210 in addition to the above-mentioned arrangement manner, as long as the first power switching device 200 can achieve through connection of one pole therein, which is not limited herein.

Referring to fig. 6 to 8, the electric driving device 240 includes an energy storage mechanism 241, a transmission mechanism 242 and a power device 243, the power device 243 provides power and transmits driving force to the energy storage mechanism 241 through the transmission mechanism 242, and the transmission mechanism 242 is respectively connected to the energy storage mechanism 241 and the power device 243 in a rotating manner. In this embodiment, the power device 243 is a motor, the transmission mechanism 242 is a gear transmission mechanism and is connected to a driving shaft of the motor, the transmission mechanism 242 and the energy storage mechanism 241 are in gear transmission, and under the driving of the motor, a driving wheel of the transmission mechanism 242 rotates and drives a driven wheel of the energy storage mechanism 241 to rotate, so as to drive the energy storage mechanism 241 to rotate. The energy storage mechanism 241 is connected to the moving contact 220, and when the energy storage mechanism 241 rotates, the moving contact 220 can be driven to rotate, so that power switching of the phase change switch 100 is realized.

Of course, in other embodiments, please refer to fig. 9, the power device 243 may also be an electromagnetic mechanism, the power device 243 includes an electromagnet 243a and a guide rod 243b, the electromagnet 243a provides power, and the guide rod 243b is hinged to the electromagnet 243a and can drive the transmission mechanism 242 to rotate by a certain angle, so as to implement the operation of the driving device 240.

With continued reference to fig. 5 to 8, one end of the static contact 230 of the first power switching device 200 is electrically connected to the power line inlet 510, and the other end of the static contact is capable of contacting or disconnecting with the movable contact 220, the number of the static contacts 230 is the same as the number of the line inlet terminals of the power line inlet 510, and the static contacts are respectively and electrically connected to the plurality of line inlet terminals of the power line inlet 510, that is: the fixed contact 230 and the plurality of inlet terminals of the power inlet terminal 510 are respectively and correspondingly disposed along the height direction of the phase change switch 100. In this embodiment, the number of the static contacts 230 is 3, and the static contacts are respectively disposed corresponding to the first power line inlet 510A, the second power line inlet 510B, and the third power line inlet 510C, and in other specific implementations, there may be two static contacts 230.

The movable contact 220 of the first power switching device 200 is rotatably connected to the insulating housing 210 and connected to the energy storage mechanism 241 through a core shaft 221, a first movable contact is disposed at one end of a movable contact rod 222 of the movable contact 220, and under the driving of the driving device 240, the movable contact 220 can rotate around the core shaft 221 and can be switched among the plurality of fixed contacts 230, so as to implement a phase change operation of the phase change switch. The moving track of the moving contact 220 is longitudinally consistent with the arrangement directions of the first power supply line inlet end 510A, the second power supply line inlet end 510B and the third power supply line inlet end 510C of the power supply line inlet end 510 from top to bottom, that is: the moving contact 220 moves up and down along the height direction of the phase change switch 100.

Preferably, the movable contact 220 may be a single-break contact or a double-break contact, and when the movable contact 220 is in a single-break structure, the other end of the movable contact rod 222 is connected to any outlet terminal of the power outlet terminal 610 through a flexible conductor, that is: the other end of the movable contact bar 222 may be connected to the first power outlet 610A or the second power outlet 610B by a flexible conductor.

When the movable contact 220 has a double-break structure, as shown in fig. 11, a second movable contact asymmetrically arranged with the first movable contact is disposed at the other end of the movable contact rod 222, that is: a distance a1 between the first moving contact and the rotation center of the moving contact 220 is not equal to a distance a2 between the second moving contact and the rotation center of the moving contact 220, at this time, the first power switching unit 200 further includes a switching static contact 270, one end of the switching static contact 270 is provided with a static contact that can be contacted with or disconnected from the second moving contact, the static contact of the switching static contact 270 and the static contact of the static contact 240 are disposed on two sides of the core shaft 221 and symmetrically or asymmetrically distributed with respect to the axis of the core shaft 221, and the other end of the switching static contact 270 is electrically connected to the first power outlet 610 through a second conductive member 280. Of course, in other embodiments, the second movable contact provided at the other end of the movable contact rod 222 may also be symmetrical to the first movable contact, that is: the distance a1 between the first moving contact and the rotation center of the moving contact 220 is equal to the distance a2 between the second moving contact and the rotation center of the moving contact 220, and the same technical effect can be achieved, which is not limited herein. In this embodiment, compared with a single-breakpoint structure, the moving contact 220 has the beneficial effects of being more beneficial to breaking and arc extinguishing, and ensuring reliable use of the switch.

Further, still be equipped with manual operation mechanism 240a in the first power switching device 200, manual operation mechanism 240a includes carousel 241a and handle 242a, carousel 241a sets up the motor with between the drive mechanism 242, and respectively with the motor with drive mechanism 242 rotates and connects, handle 242a with the carousel is detachable fixed connection, carousel 241a cover is established in the pivot of motor, and with drive mechanism 242 fixed connection. When manual operation is needed, the handle 242a drives the rotating disc 241a, the rotating disc 241a drives the transmission mechanism 242 to move, the transmission mechanism 242 transmits the power to the energy storage mechanism 241, and the energy storage mechanism 241 drives the moving contact 220 to be quickly disconnected or connected with the switching static contact 270 and the static contact 230 through the spindle 221, so that manual phase change operation is completed.

In another preferred embodiment, as shown in fig. 10, the operating mechanism 240b includes a rotating shaft 241b, one end of the rotating shaft 241b extends into the core shaft 242b, and the other end of the rotating shaft 241b is provided with a hexagon socket or other polygonal or irregular holes, when a phase change operation needs to be performed, the hole at the end of the rotating shaft 241b is pushed by an external tool such as a wrench, the rotating shaft 241b starts to rotate, so as to drive the core shaft 242b of the energy storage unit 230 to rotate, and further, the core shaft 242b drives the execution unit 230 to rotate, thereby implementing the phase change operation. Of course, in other embodiments, the hexagonal socket, other polygon or special-shaped hole provided at the end of the rotating shaft 241b may be replaced by a raised hexagon, other polygon or special-shaped column structure, and the phase change operation may also be implemented by a corresponding tool during manual operation.

In a preferred embodiment, a first current transformer 290, a second current transformer 290A, and a third current transformer 290b are further disposed in the first power switching device 200, the first current transformer 290 is sleeved on a power line inlet terminal 510A corresponding to a direct power of the first power switching device 200 for detecting current information flowing through a corresponding main power line inlet terminal, the second current transformer 290A is sleeved on a power line outlet terminal corresponding to the first conductive member 260 for detecting current information flowing through a corresponding power line inlet terminal, and the third current transformer 290b is sleeved on a non-direct power loop, for example, a line outlet terminal corresponding to the non-direct power loop or the second conductive member 280. The first current transformer 290, the second current transformer 290a, and the third current transformer 290b are metering transformers, but may also be non-metering transformers in other possible embodiments, and are not limited herein.

In a preferred embodiment, an electronic controller 250 is further disposed in the first power switching device 200, in this embodiment, the first current transformer 290, the second current transformer 290a, and the third current transformer 290b may transmit the acquired current information to the electronic controller 250, and the electronic controller 250 determines a current imbalance condition according to the received current information and sends a phase change instruction. The electronic controller 250 further includes a voltage acquisition module, which can provide voltage signals for the electronic controller 200, and calculate information such as power and energy consumption.

Further, a communication module and an intelligent distribution transformer control terminal are further arranged in the first power switching device 200, and the intelligent distribution transformer control terminal is a high-integration and high-intelligence control terminal which can realize distribution transformer state monitoring, load imbalance control strategies, reactive compensation control, reports, metering and remote system communication by utilizing the modern digital signal processing technology. The electronic controller CAN control the communication module to send related information to the intelligent distribution transformer control terminal, so that the intelligent distribution transformer control terminal CAN know the state and the load condition of the power supply switching device in real time, calculate the three-phase unbalance degree, make a load control strategy and send a control command, the communication module transmits the control command to the electronic controller to carry out phase change action on the power supply switching device so as to realize the three-phase balance of the load, the communication module CAN adopt a wireless communication mode or a wired communication mode, the wireless communication mode comprises Bluetooth, infrared, Wifi, BLE, ZigBee, GPRS, 4G, 5G, NB-IoT or LoRa, and the wired communication mode comprises RS485, LAN, CAN, DeviceNet, Profibus or HPLC and the like.

The following detailed description of the power switching process of the first power switching device 200 is as follows:

the electronic controller 250 determines the current imbalance condition according to the received current information, and sends a phase change instruction, the motor starts to rotate after receiving the instruction, and transmits the instruction to the energy storage mechanism 241 through the transmission mechanism 242, and the energy storage mechanism 241 drives the moving contact 220 to be quickly disconnected or connected with the switching static contact 270 and the static contact 230 through the mandrel 221. In this embodiment, after energy is stored in the energy storage mechanism 241 once, energy is released immediately to achieve quick closing and quick opening, and no locking mechanism stores energy, i.e. a so-called non-pre-energy-storage energy storage mechanism, of course, in other possible embodiments, the energy storage mechanism 241 may be a pre-energy-storage operating mechanism, i.e. after energy is stored, a dedicated locking mechanism stores energy, and during the time, energy can be released instantaneously through a triggering mechanism to achieve faster action.

The second power switching device 300, the third power switching device 400 and the first power switching device 200 have the same structure, and are not described herein again. The number of the power switching devices may be adjusted according to actual conditions, or may be two.

The invention completes automatic phase change by arranging one path of power supply outlet end to be directly communicated with one path of power supply inlet end, and the other path of power supply outlet end to be communicated with and disconnected from a plurality of paths of power supply inlet ends through the movable and static contacts, thereby automatically completing the three-phase balance of current; according to the invention, by arranging the two power supply outlet ends, the load distribution can be adjusted according to actual requirements, and the loads under the two power supply outlet ends are manually installed and adjusted, so that the load distribution of the two power supply outlet ends in different proportions is realized, on one hand, the three-phase balance of current can be manually completed, on the other hand, only part of current can be converted during phase change, the problem of overload of the other phase current caused by switching of all current is effectively avoided, and the phase-to-phase current balance is more favorably realized; when the phase change switch is provided with three power supply switching devices, the through power supply arranged on each power supply switching device can be respectively set to be A, B, C different phases of a three-phase power supply, the phase change switch can be used for three-phase loads such as a three-phase motor and the like, and the through A, B, C can not act to change the phase sequence during the phase change action, so that the problems of motor reversal and the like caused by the phase change action of the three-phase load after the phase sequence is changed are avoided, and the three-phase load can still work normally during the phase change action.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (11)

1. The utility model provides a phase change switch (100), includes insulating casing (210), power inlet wire end (510), power outlet wire end (610), at least one moving contact (220), at least two static contacts (230), its characterized in that: the power supply inlet wire end (510) comprises a first power supply inlet wire end (510A) and a second power supply inlet wire end (510B), the power supply outlet wire end (610) comprises a first power supply outlet wire end (610A) and a second power supply outlet wire end (610B), the second power supply inlet wire end (510B) is electrically connected with the second power supply outlet wire end (610B) through a fixed contact (230) and a movable contact (220), the first power supply inlet wire end (510A) is directly and electrically connected with the first power supply outlet wire end (610A), and the first power supply outlet wire end (610A) and the second power supply outlet wire end (610B) are insulated from each other.

2. A commutation switch (100) according to claim 1, wherein: the first power supply inlet end (510A) is electrically connected with the first power supply outlet end (610A) through a first conductive piece (260), and the first conductive piece (260) is arranged inside or outside the insulating shell (210).

3. A commutation switch (100) according to claim 1, further comprising at least one electric drive (240), the electric drive (240) comprising an energy storage mechanism (241), a transmission mechanism (242) and a power device (243).

4. A commutation switch (100) according to claim 3, wherein: the power device (243) is a motor or an electromagnetic mechanism.

5. A commutation switch (100) according to claim 1, wherein: the commutation switch (100) is provided with at least one electronic controller (250).

6. A commutation switch (100) according to claim 1, wherein: the phase change switch (100) is provided with a wired or wireless communication module.

7. A commutation switch (100) according to claim 1, wherein: the phase change switch (100) is provided with at least one current sensor and/or at least one voltage acquisition module.

8. A commutation switch (100) according to claim 1, wherein: the moving contact (220) is of a single-breakpoint type or a double-breakpoint type.

9. A commutation switch (100) according to claim 1, wherein: the phase change switch (100) is provided with a manual operation mechanism (240 a).

10. A commutation switch (100) according to claim 1, wherein: the load value carried by the first power outlet terminal (610A) and the second power outlet terminal (610B) is increased or decreased according to the load requirement.

11. A commutation switch (100) according to claim 1, wherein: one or more paths of non-through power supplies of the phase change switch (100) can switch 220V voltage; the through power supply of the commutation switch (100) can switch 380V or 220V.

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