CN221328829U - Intelligent star-delta starting switch - Google Patents

Abstract

The application discloses an intelligent star-delta starting switch, which comprises a switch body, a first switch body, a second switch body and a second switch body, wherein the switch body comprises a controller, a main contact device, a star-delta contact device, a first incoming line terminal group, a first outgoing line terminal group and a second connection terminal group; the number of terminals in the first incoming line terminal group, the first outgoing line terminal group and the second wiring terminal group is three; each terminal in the first wire-incoming terminal group is used for being electrically connected with a three-phase power supply, each terminal in the first wire-outgoing terminal group is used for being electrically connected with one end of a motor winding, and each terminal in the second wire-incoming terminal group is used for being electrically connected with the other end of the motor winding; the device comprises a controller, a first incoming line terminal group, a second incoming line terminal group, a transformer group and a transformer group, wherein the transformer group is sleeved on the first incoming line terminal group or the first outgoing line terminal group, and the output end of the transformer group is electrically connected with the controller and used for transmitting collected current parameters to the controller; the application can effectively identify the information of the flowing current and provides a possibility for designing some protection functions.

Description

Intelligent star-delta starting switch

Technical Field

The application relates to the field of low-voltage switch electricity, in particular to an intelligent star-delta starting switch.

Background

The star-delta starting device is also called star-delta step-down starting device, and is a common motor starting circuit. The conventional star-delta starting device needs parts such as a main contactor, a star contactor and an angular contactor, wherein the windings of the main contactor, the star contactor and the motor are electrically connected to form star connection, and the windings of the main contactor, the angular contactor and the motor are electrically connected to form angular connection. When the motor is started, the main contactor and the star contactor are firstly connected, when the motor rotation speed reaches the rated rotation speed, the star contactor is disconnected, the angular contactor is connected, and the circuit is converted from star connection to angular connection at the moment so as to ensure the stable operation of the motor.

The switches in the star-delta starting device are scattered, so that the wiring of a user is very troublesome, and the installation of a current sampling unit is inconvenient.

With continuous research by those skilled in the art, an integrated star-delta starting switch integrating the above functions, such as CN116453907a, is developed and designed, and the star-delta starting switch can realize the step-down starting of the motor, but the star-delta starting switch cannot identify the current parameters of the motor, so that it is difficult to realize other functions.

Therefore, how to design an integrated star-delta start switch which is beneficial to identifying motor current parameters is a research-worthy direction.

Disclosure of Invention

Therefore, the application aims to overcome the defects in the prior art, and aims to provide an intelligent star-delta starting switch which can effectively identify the information of the flowing current and provide a possibility for designing some protection functions.

The application provides an intelligent star-delta starting switch which comprises a switch body, a first power supply, a second power supply, a first power supply and a second power supply, wherein the switch body comprises a controller, a main contact device, a star-delta contact device, a first incoming line terminal group, a first outgoing line terminal group and a second wiring terminal group; the number of terminals in the first incoming line terminal group, the first outgoing line terminal group and the second wiring terminal group is three; each terminal in the first wire-incoming terminal group is used for being electrically connected with a three-phase power supply, each terminal in the first wire-outgoing terminal group is used for being electrically connected with one end of a motor winding, and each terminal in the second wire-incoming terminal group is used for being electrically connected with the other end of the motor winding; the device further comprises a transformer group, wherein the transformer group is sleeved on the first incoming line terminal group or the first outgoing line terminal group, and the output end of the transformer group is electrically connected with the controller and used for transmitting collected current parameters to the controller.

By adopting the structure, the transformer is sleeved on the first incoming line terminal group or the first outgoing line terminal group of the integrated star-delta starting switch, current parameters of current flowing through the motor winding can be collected through the current transformer, corresponding current parameters can be collected through the controller, the current parameters can be effectively identified, and a possibility is provided for setting some protection functions or data display functions.

In some embodiments of the application, the transformer group comprises a transformer housing in which three transformers are disposed; each terminal in the first incoming line terminal group or the first outgoing line terminal group is arranged beyond the transformer housing after penetrating through the corresponding transformer respectively.

By adopting the structure, the transformer can be protected by the transformer housing, and meanwhile, the terminal passes through the transformer housing after passing through the transformer, so that wiring is facilitated.

In some embodiments of the application, the mutual inductor housing is fastened or clamped and fixed with the shell of the switch body through screws.

By adopting the structure, the stability of the transformer housing and the switch shell can be improved.

In some embodiments of the application, the transformer housing comprises a transformer base and a transformer upper cover, wherein the base and the upper cover are fastened by screws and/or clamped and fixed; one of the transformer base and the transformer upper cover is provided with a transformer chamber with an opening, the transformer chamber is used for accommodating a transformer, and the other one of the transformer base and the transformer upper cover is used for closing the opening of the transformer chamber.

With the adoption of the structure, the arrangement of the cavity of the transformer is beneficial to the installation and the disassembly of the transformer.

In some embodiments of the application, each terminal penetrating the transformer has an enlarged portion with a width dimension greater than the width dimension of the remainder of the terminal and with a width dimension greater than the width dimension of the central bore of the transformer, and the transformer housing is provided with a mating cavity that mates with the enlarged portion.

By adopting the structure, the design of the enlarged part is favorable for realizing the installation stability of the transformer, is favorable for being matched with the transformer housing, and improves the stability between the transformer housing and the switch body.

In some embodiments of the application, a interphase partition plate is arranged at the position of the shell of the switch body, which is positioned at the first outlet terminal group, the transformer housing is provided with a first rib which is in plug-in fit with the interphase partition plate, and the interphase partition plate is in plug-in fit with the first rib to form an embedded structure; or/and, the shell of the switch body is provided with two side walls at two sides of the first outlet terminal group, the transformer housing is provided with second ribs which are staggered with the two side walls, and the staggered arrangement of the side walls and the second ribs forms an embedded structure; or/and, the shell of the switch body is provided with a bottom wall at the lower part of the first outlet terminal group, a space exists between the first outlet terminal group and the bottom wall, the transformer housing is provided with a third rib, and an embedded structure is formed in the third rib insertion space.

By adopting the structure, no matter which embedded structure is adopted, the shell of the switch body is more tightly connected with the transformer housing, and the installation stability of the transformer housing is improved.

In some embodiments of the present application, the controller 4 drives the intelligent star delta start switch to open when the current parameter is abnormal; the abnormal current parameter refers to an abnormal current parameter caused by overload, an abnormal current parameter caused by short circuit, an abnormal current parameter caused by undervoltage, an abnormal current parameter caused by over-voltage, an abnormal current parameter caused by over-current, an abnormal current parameter caused by undercurrent, an abnormal current parameter caused by open phase, an abnormal current parameter caused by three-phase imbalance, an abnormal current parameter caused by motor stall, or an abnormal current parameter caused by leakage.

By adopting the structure, one or more of overload protection, short-circuit protection, phase-failure protection, motor locked-rotor protection, electric leakage protection, three-phase unbalance protection, overvoltage protection, undervoltage protection, overcurrent protection and undercurrent protection can be built in the controller, and related protection can be realized through current parameter information acquired by the transformer group, so that the protection of a motor winding is improved.

In some embodiments of the present application, a man-machine interaction interface is further provided on the switch body, and the man-machine interaction interface is electrically connected with the controller; the man-machine interaction interface comprises a display device and/or an input key, wherein the display device is used for displaying electrical information, and the input key is used for a user to change controller information.

By adopting the structure, through the setting of the man-machine interaction interface, the parameter design of the controller can be enriched, and the user can conveniently check the related electrical information.

In some embodiments of the present application, the height dimension of the main contact device is lower than the height dimension of the star-delta contact device, and the man-machine interface is located above the main contact device.

By adopting the design of the structure, the machine interaction interface is arranged above the main contact device, so that the height difference between the main contact device and the star-delta contact device can be made up, the height difference between the main contact device and the star-delta contact device is reduced as much as possible, and the whole product looks more compact and attractive.

In some embodiments of the present application, the main contact device includes a main contact assembly, a main contact support for driving the main contact assembly to be turned on/off, and a first electromagnetic system for driving the main contact support to move, wherein the first incoming line terminal group and the first outgoing line terminal group are electrically connected with the main contact assembly; the star-angle contact device comprises a star contact assembly, an angle contact assembly, a star contact support for driving the star contact assembly to be connected/disconnected, an angle contact support for driving the angle contact assembly to be connected/disconnected and a second electromagnetic system for driving the star contact support and the angle contact support to move; the star contact support and the angle contact support are in linkage, the star contact assembly and the angle contact assembly form interlocking, the star contact assembly is in normally closed arrangement, the angle contact assembly is in normally open arrangement, and the second wiring terminal group is electrically connected with the angle contact assembly and the star contact assembly; the controller is used for controlling the on-off of the first electromagnetic system and the second electromagnetic system; when the star contact assembly and the main contact assembly are simultaneously connected, the star connection is adopted at the moment; when the angular contact assembly and the main contact assembly are simultaneously connected, the angular connection is adopted.

With this structure, the conversion between the star connection and the angle connection can be realized by the controller.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of an intelligent star delta starting switch according to embodiment 1 of the present application;

FIG. 2 shows an exploded view of the intelligent star delta start switch of embodiment 1 of the present application;

FIG. 3 is a schematic view showing the structure of a base in embodiment 1 of the present application;

FIG. 4 is a schematic view showing the structure of a susceptor in embodiment 1 of the present application;

FIG. 5 is a schematic diagram showing the structure of the main contact system and the star-delta contact system in embodiment 1 of the present application;

Fig. 6 is a schematic diagram showing the structure of a first electromagnetic system in embodiment 1 of the present application;

fig. 7 is a schematic view showing the structure of a main contact assembly in embodiment 1 of the present application;

fig. 8 is a schematic diagram showing the structure of a second electromagnetic system in embodiment 1 of the present application;

FIG. 9 is a schematic view showing the structure of a star and angular contact assembly according to embodiment 1 of the present application;

fig. 10 to 12 are structural relationships of the second terminal assembly and the conductor assembly according to embodiment 1 of the present application;

Fig. 13 shows an exploded view of the transformer group of embodiment 1 of the present application;

Fig. 14 is a schematic view showing a structure of the transformer group according to embodiment 1 of the present application to remove the upper cover of the transformer;

Fig. 15 is a schematic view showing the structure of the transformer upper cover of embodiment 1 of the present application;

fig. 16 is a schematic view showing the configuration of the mutual inductor base and base of embodiment 1 of the present application;

fig. 17 is a schematic block diagram showing the application of the star-delta starting switch of embodiment 1 of the present application to a motor starting circuit;

fig. 18 is a schematic structural diagram showing another embodiment of the transformer group according to embodiment 1 of the present application.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "primary," "secondary," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "primary" or "secondary" may include one or more such feature, either explicitly or implicitly. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a primary feature "up" or "down" a secondary feature may be a direct contact of the primary and secondary features, or an indirect contact of the primary and secondary features through an intervening medium. Moreover, a main feature "above", "over" and "above" a second feature may be that the main feature is directly above or obliquely above the second feature, or simply that the main feature level is higher than the second feature. The main feature "under", "below" and "beneath" the second feature may be the main feature directly under or obliquely under the second feature, or simply indicate that the main feature level is less than the second feature.

Examples

As shown in fig. 1 to 18, an embodiment of the present application provides a star-delta start switch, which includes a switch body and a transformer group 5, wherein the switch body includes a housing 1, a main contact device 2, a star-delta contact device 3, and a controller 4.

The housing 1 is used for accommodating components of the main contact device 2, the star-delta contact device 3 and the controller 4, and in this embodiment, the housing 1 is composed of a plurality of sub-housings 1, and the sub-housings 1 are a base 1a, a base 1b, a star-delta contact device seat 1d, a star-delta contact device top cover 1e, a man-machine interface base 1h, a man-machine interface top cover 1f and an insulating housing 1g. The base 1a includes, in order along its length, a main contact arrangement mounting area 1a1, a controller mounting area 1a2, and a star-delta contact arrangement mounting area 1a3. The base 1b is disposed above the base 1a (screw fastening is adopted between the base and the base, and fastening can be adopted by a buckle, of course), and the base also comprises a main contact device placement area 1a1, a controller placement area 1a2 and a star-angle contact device placement area 1a3 along the length direction. The base 1b, the main contact arrangement seating area 1a1 of the base 1a together form a space accommodating the main contact arrangement 2. The star-contact device holder 1d is disposed above the base 1b (the two are fastened by a fastener, or screw fastening may be employed), the star-contact device top cover 1e is disposed above the star-contact device holder 1d (the two are fastened by a screw fastening, or fastener fastening may be employed), and the star-contact device top cover 1e, the star-contact device holder 1d, the base 1b, and the star-angular contact device placement region 1a3 of the base 1a together form a space for accommodating the star-angular contact device 3. The controller top cover 1f is disposed above the base 1b (screw fastening is adopted between the two parts, and of course, fastening may also be adopted in addition to the above,), and the controller man-machine interface base 1h, the man-machine interface top cover 1f, the base 1a, and the controller placement area 1a2 of the base 1b together form an installation space of the controller 4 and the man-machine interface (circuit board assembly). An insulating housing 1g is provided on one side of the base 1b, and three insulating passages 1g1 are provided inside for the conductors to pass through. The above structure is only a preferable scheme of the shell 1, and the shell 1 can also be adaptively deformed, for example, the main contact device 2, the star-angle contact device 3 and the controller 4 are respectively independent shells 1, and the shells 1 of the three are connected together through fastening connection or screw fastening or rivet fastening. The housing 1 of any type can be secured to have the components accommodating the main contact device 2, the star-delta contact device 3, and the controller 4, and has the effect of protecting the components.

As shown in fig. 5, the main contact device 2 includes a main contact assembly 23, a main contact support 22 for driving the main contact assembly 23 on/off, and a first electromagnetic system 21 for driving the main contact support 22 to move.

As shown in fig. 6, the first electromagnetic system 21 sequentially includes, from bottom to top, a first yoke 211, a first coil assembly 212, and a first armature 213, which form an electromagnet, and a first reset structure 214 is disposed between the first yoke 211 and the first armature 213. The first return structure 214 is a compression spring, and it is needless to say that, other than the compression spring, a torsion spring, a spring piece, or the like may be used as long as it can ensure that a return force is generated after the first armature 213 moves. The main contact support 22 is fixed with the first armature 213, and the main contact support 22 is located above the first armature 213. The specific working flow is as follows: when the first coil assembly 212 is energized, the first magnetic yoke 211 attracts the first armature 213 to move downward, and the first return structure 214 compresses to generate a return force; when the first coil assembly 212 is de-energized, the attractive force is lost and the first armature 213 is returned to its original position by the return force of the first return structure 214.

As shown in fig. 7, the main contact assembly 23 includes an active contact bridge set 231, a first main static contact bridge set 232, a second main static contact bridge set 233, and a main contact assembly biasing member, where the number of contact bridges in the active contact bridge set 231, the first main static contact bridge set 232, and the second main static contact bridge set 233 is three and corresponds to the number of windings of the motor M. The active contact bridge set 231 and the main contact assembly biasing member (not shown in the drawings, the biasing member is a spring, but other elastic structures such as a shrapnel and a torsion spring may be adopted) are disposed on the main contact support 22, and the first main static contact bridge set 232 and the second main static contact bridge set 233 are disposed on two sides (on the corresponding area of the base 1 b) of the main contact support 22 respectively. When the first coil assembly 212 is energized, the active contact bridge set 231 is brought into contact with the two main static contact bridge sets along with the main contact support 22, and the main contact assembly biasing member is now able to ensure that the active contact bridge set 231 is in full contact (medium pressure) with the two main static contact bridge sets.

As shown in fig. 5, the star-angle contact device 3 includes a star contact assembly 34, an angle contact assembly 33, a star contact support 32a for switching the star contact assembly 34 on/off, an angle contact support 32b for switching the angle contact assembly 33 on/off, and a second electromagnetic system 31 for driving the star contact support 32b to move. In the present embodiment, the star contact support 32a and the corner contact support 32b are linked, and the linked arrangement may be an integrally formed part, or a linked arrangement in which the star contact support 32a and the corner contact support 32b are separately formed and then connected together by means of clamping, screw fastening, rivet fastening, or the like, so long as synchronous movement of the star contact support 32a and the corner contact support 32b is ensured.

As shown in fig. 8, the second electromagnetic system 31 sequentially includes, from bottom to top, a second yoke 311, a second coil assembly 312, and a second armature 313, which form an electromagnet, and a second reset structure 314 is disposed between the second yoke 311 and the second armature 313. The second restoring structure 314 is a compression spring, and it is needless to say that, other than the compression spring, a torsion spring, a spring piece, or the like may be used as long as it can ensure that a restoring force is generated after the second armature 313 moves. The corner contact support 32b is fixed with the second armature 313, and the corner contact support 32b is located above the second armature 313. The specific working flow is as follows: when the second coil assembly 312 is energized, the second yoke 311 attracts the second armature 313 to move downwards, and the second reset structure 314 compresses to generate a reset force; when the second coil assembly 312 is de-energized, the attractive force is lost and the second armature 313 returns to its original position under the return force of the second return structure 314.

As shown in fig. 9, the angular contact assembly 33 includes an angular movable contact bridge group 331, a first angular static contact bridge group 332, a second angular static contact bridge group 333, and an angular contact assembly biasing member 334, where the number of contact bridges in the angular movable contact bridge group 331, the second angular static contact bridge group 333, and the second angular static contact bridge group 333 is three corresponding to the number of windings of the motor M. The angle movable contact bridge group 331 and the angle contact assembly biasing member 334 (which are springs, but may also be elastic structures such as spring plates and torsion springs) are disposed on the angle contact support 32b, and the first angle movable contact bridge group 332 and the second angle movable contact bridge group 333 are disposed on two sides (on the corresponding area of the base 1 b) of the angle contact support 32 b. When the second coil assembly 312 is energized, the corner movable contact bridge group 331 is brought into contact with the corner contact support 32b and the two corner stationary contact bridge groups, and at this time, the corner contact assembly biasing member 334 can ensure that the corner contact support 32b is in full contact (medium pressure) with the two corner stationary contact bridge groups.

As shown in fig. 9, the star contact assembly 34 includes a star moving contact bridge group 341, a first star static contact bridge group 342, a second star static contact bridge group 343, and a star contact assembly biasing member 344, where the number of contact bridges in the star moving contact bridge group 341, the second star static contact bridge group 343, and the second star static contact bridge group 343 is three and corresponds to the number of windings of the motor M. The star-moving contact bridge set 341 and the star-contacting component biasing member 344 (which are springs, other structures having elastic forces such as elastic sheets and torsion springs may be adopted) are disposed on the star-contacting support 32a, and the first star-moving contact bridge set 342 and the second star-moving contact bridge set 343 are disposed on two sides (on the corresponding area of the star-contacting device seat 1 d) of the star-contacting support 32 a. When the second coil assembly 312 is not energized, the star movable contact bridge set 341 is brought into contact with the two star stationary contact bridge sets, and the star contact assembly biasing member 344 is now able to ensure that the star contact support 32a is in full contact (medium pressure) with the two star stationary contact bridge sets. The three static contact bridges in the first star static contact bridge group 342 are shorted together by an electrical conductor (for forming a star connection), and the shorting mode here may be a flexible wire, a flexible connection, a flexible conductive braid, a hard busbar 342a, or the like, so long as the conductors can realize shorting between the three.

In the present embodiment, the star contact assembly 34 and the angular contact assembly 33 are in a mechanically interlocking relationship, i.e., the angular contact assembly 33 is broken when the star contact assembly 34 is turned on; the angular contact assembly 33 is on when the star contact assembly 34 is off. Meanwhile, the star contact assembly 34 is normally closed, that is, the star contact assembly 34 is already in the on state when the star delta start switch is not operating.

As shown in fig. 1, a first outgoing line wiring group 11, a first incoming line wiring group 12 and a second wiring group 13 are exposed outside the casing 1, wherein the number of terminals inside each of the first outgoing line wiring group 11, the first incoming line wiring group 12 and the second wiring group 13 is three, and the number of terminals is consistent with the number of three-phase power supply and motor M windings. In order to improve the creepage distance, a plurality of groups of interphase separators can be added on the shell, and the interphase separators are used for separating all terminals in the first outgoing line wiring group 11, all terminals in the first incoming line wiring group 12 and all terminals in the second wiring group 13. The first wire-outgoing connection set 11 is electrically connected with one end of the motor M winding, the first wire-incoming connection set 12 is electrically connected with the three-phase power supply, and the second wire-outgoing connection set 13 is electrically connected with the other end of the motor M winding.

As shown in fig. 1, 7, 9 and 10, each terminal in the first outgoing line connection set 11 is electrically connected to each contact bridge in the first main static contact bridge set 232 in the housing 1, in this embodiment, each terminal in the first outgoing line connection set 11 and each contact bridge in the first main static contact bridge set 232 are integrally formed, and of course, this integrally formed manner may also be formed separately and then connected by using an electrical conductor, where the electrical conductor may be a flexible wire, a flexible connection, a flexible conductive braid, or a hard busbar.

As shown in fig. 1, 7, 9 and 10, each terminal in the first incoming wire connection set 12 is electrically connected to each contact bridge in the second main static contact bridge set 233 in the housing 1, and similarly, each terminal in the first incoming wire connection set 12 and each contact bridge in the second main static contact bridge set 233 are integrally formed, which may be formed separately and then connected by using an electrical conductor, where the electrical conductor may be a flexible wire, a flexible connection, a flexible conductive braid or a hard busbar. When the active contact bridge group 231 is connected, the first outgoing line connection group 11 and the first incoming line connection group 12 can be connected, and when the active contact bridge group 231 is disconnected, the first outgoing line connection group 11 and the first incoming line connection group 12 are disconnected.

As shown in fig. 11-13, the first incoming wire connection set 12 is electrically connected to the first corner static contact bridge set 332 through the conductor assembly d1, where the conductors in the conductor assembly d1 are hard bus bars, and of course, soft wires, soft connection, soft conductive braids and the like can be adopted. The number of conductors in the conductor assembly d1 is three, that is, each terminal in the first incoming wire connection set 12 is electrically connected to each static contact bridge in the first corner static contact bridge set 332 by a conductor. Meanwhile, the three conductors are mutually isolated through the three insulating channels 1g1, and the three conductors are designed in a staggered manner in the height direction and the length direction of the switch so as to facilitate wiring.

As shown in fig. 1, 7, 9 and 10, each terminal in the second wire group 13 is electrically connected to each static contact bridge in the second star static contact bridge group 343 and each static contact bridge in the second corner static contact bridge group 333. In this embodiment, each terminal in the second wire group 13 and each static contact bridge in the second corner static contact bridge group 333 are in an integral structure, each static contact bridge in the second star static contact bridge group 343 is bent after extending and is electrically connected with each terminal in the second wire group 13, and the structure of bending after extending may not be adopted here, for example, a section of conductor may be adopted for connection, and the conductor may be one of a hard busbar, a flexible conductor, a flexible connection and a flexible conductive braid. Of course, besides, each terminal in the second connection set 13 may be changed into an integral structure with each static contact bridge in the second star static contact bridge set 343, and each static contact bridge in the second corner static contact bridge set 333 may be electrically connected with each terminal in the second connection set 13 by bending after extending, or may not adopt a structure of bending after extending, for example, a section of conductor may be used for connection, and the conductor may be one of a hard busbar, a soft wire, a soft connection, and a soft conductive braid. Likewise, it is also possible to deform each terminal in the second connection group 13, each static contact bridge in the second star static contact bridge group 343, and each static contact bridge in the second corner static contact bridge group 333 into a split structure, and then electrically connect through conductors. In either case, electrical connection may be achieved.

With the above-described conductive connection structure, when both the main contact assembly 23 and the angular contact assembly 33 are connected, an angular connection can be formed together with the motor M winding. And when both the star contact assembly 34 and the main contact assembly 23 are on, a star connection may be formed with the motor M windings.

As shown in fig. 1-2,13-16,18, the transformer set 5 is sleeved on the first outlet terminal set 11, and is used for sampling current parameters of current flowing through the motor winding to the controller 4.

Specifically, the transformer group 5 includes a transformer housing 51, and transformers 52 disposed in the transformer housing 51, where the number of transformers 52 is identical to the number of terminals in the first outgoing line terminal group 11, the transformers 52 are respectively sleeved on the corresponding terminals, and electrical connection is achieved between the transformers 52 and the controller 4 through leads or connectors. Each terminal in the first set of outlet terminals 11 is disposed beyond the transformer housing 51 to facilitate wiring.

As shown in fig. 13-16, in one embodiment of the transformer substation 5, the transformer enclosure 51 includes a transformer base 51a and a transformer upper cover 51b, and screw fastening is adopted between the transformer base 51a and the transformer upper cover 51b, and fastening and fixing by using a hook, a buckle, or the like can be adopted instead of fastening by a bolt. Three transformer chambers 51a1 are arranged in the transformer base 51a, the three transformer chambers 51a1 are respectively used for accommodating three transformers 52, wherein the left and right of the three transformers 52 are arranged side by side, and the middle are arranged in a dislocation manner. The upper side of the transformer chamber 51a1 is of an open structure, and the opening therein may be closed by a transformer upper cover 51 b.

The transformer base 51a is further provided with three mating cavities 51a2, and the number of the mating cavities 51a2 is three to accommodate the enlarged portion 11 a. Each terminal in the first wire-outlet terminal set 11 has an enlarged portion 11a, where the enlarged portion 11a has a width dimension greater than the width dimension of the remainder of the terminal, and the enlarged portion 11a has a width dimension greater than the width dimension of the central hole of the transformer 52.

The base 1b is provided with a phase-separating plate 1b1 at the first outlet terminal group 11, the transformer base 51a is provided with a first rib 51aa which is in plug-in fit with the phase-separating plate 1b1, and the phase-separating plate 1b1 is in plug-in fit with the first rib plug 51aa to form an embedded structure. The base 1b is provided with two side walls 1b2 at two sides of the first outlet terminal group 11, the base 1b is provided with a second rib 51ab which is staggered with the two side walls 1b2, and the staggered arrangement of the side walls 1b2 and the second rib 51ab forms an embedded structure. The base 1b is provided with a bottom wall 1b3 at the lower part of the first outlet terminal group 11, a space exists between the first outlet terminal group 11 and the bottom wall 1b3, the transformer base 51a is provided with a third rib 51ac, and the third rib 51ac is inserted into the space to form an embedded structure.

The upper cover 51b of the transformer has a hook 51b1, and the hook 51b1 hooks into the base 1h and the top cover 1f of the human-computer interaction interface to form a clamping fit between the shell 51 of the transformer and the shell 1. Of course, other manners of snap fit engagement of the transformer enclosure 51 with the housing 1, such as snap fit engagement between the transformer base and the housing, may also be employed. Of course, besides the clamping fit, screws can also be used for fastening the transformer base and the shell.

As shown in fig. 18, in another embodiment of the transformer substation 5, a transformer housing 51 is a single piece having a transformer chamber 51a1 inside and an opening in a side of the transformer housing 51 facing the case, the transformer housing 51 is fastened to the case by screws, and the number of transformers 52 is three and arranged in the transformer chamber 51a1 in a delta-shaped distribution.

As shown in fig. 1-2, the human-computer interaction interface base 1h and the human-computer interaction interface top cover 1f are located right above the main contact device, and the human-computer interaction interface is arranged in the human-computer interaction interface base 1h and the human-computer interaction interface top cover 1 f. The man-machine interface here comprises a display device 61, input keys 62 and associated circuit board components, and is electrically connected to the controller 4. The display device 61 may display electrical information of the switch, while the input keys 62 are used for a user to change parameter information of the controller 4. The related circuits for displaying the electrical information and changing the parameters are known to those skilled in the art of low-voltage power, and are not described herein.

The controller 4 comprises an MCU, a control program is arranged in the MCU, and the MCU is used for controlling the start of the star-delta start switch. Specifically, the MCU is configured to control the on/off of the first coil assembly 212 and the second coil assembly 312, so that the main contact assembly 23, the star contact assembly 34, and the angular contact assembly 33 are turned on/off to realize the start of the star delta start switch. Of course, the control device can adopt DSP, CPU, MPU and the like besides adopting the MCU, so long as a certain control logic can be realized through a built-in program, and the start of the star-delta start switch can be controlled. The controller 4 has the functions of overload protection, short-circuit protection, phase-loss protection, motor locked-rotor protection, electric leakage protection, three-phase unbalance protection, overvoltage protection, undervoltage protection, overcurrent protection and undercurrent protection besides the simple program for controlling the star-delta starting switch to start and turn off, and the functions can be one or more of the functions, even all the functions.

Taking overload protection as an example, an overload protection threshold value is preset in the controller 4, current parameters collected by the transformer group 5 reach the overload protection threshold value, and the controller 4 controls the main contact device to perform breaking operation.

Taking short-circuit protection as an example, a short-circuit protection threshold value is preset in the controller 4, current parameters collected by the transformer group 5 reach the short-circuit protection threshold value, and the controller 4 controls the main contact device to conduct breaking operation.

Taking open-phase protection as an example, when the current parameters collected by the transformer group 5 meet the condition of open-phase, the controller 4 controls the main contact device to perform breaking operation.

Taking three-phase unbalance protection as an example, when current parameters of each phase collected by the transformer group 5 meet the three-phase unbalance condition, the controller 4 controls the main contact device to perform breaking operation.

Taking overvoltage protection as an example, when the current parameters of each phase collected by the transformer group 5 meet the condition of overvoltage, the controller 4 controls the main contact device to perform breaking operation.

Taking under-voltage protection as an example, when the current parameters of each phase collected by the transformer group 5 meet the under-voltage condition, the controller 4 controls the main contact device to perform breaking operation.

Taking overcurrent protection as an example, when the current parameters of each phase collected by the transformer group 5 meet the condition of overcurrent, the controller 4 controls the main contact device to perform breaking operation.

Taking under-current protection as an example, when the current parameters of each phase collected by the transformer group 5 meet the under-current condition, the controller 4 controls the main contact device to perform breaking operation.

Taking the locked rotor protection as an example, current parameters of each phase collected by the transformer group 5 can be increased in a short time during locked rotor, and the controller 4 controls the main contact device to perform breaking operation.

Taking earth leakage protection as an example, the transformer group 5 can be replaced by a zero sequence transformer, and when the current parameter collected by the zero sequence transformer is abnormal, the controller 4 controls the main contact device to perform breaking operation. Of course, the zero sequence transformer can also adopt an external structure, and only the communication interface J1 is reserved on the controller, so that the acquisition signal of the zero sequence transformer is transmitted to the controller through the communication interface J1.

No matter what kind of protection function is specifically implemented by the program, how the protection function is integrated into the controller is already a conventional technical means for those skilled in the art of low voltage power, and will not be described in detail herein.

Since the star contact assembly 34 does not generate an arc when it is turned on and off, a corresponding arc extinguishing member may not be provided. As shown in fig. 7 and 9, the main arc extinguishing assembly 23a is provided near the main contact assembly 23 and the angular contact assembly 33 because the arc is generated when the main contact assembly 23 and the angular contact assembly 33 are separated, and the arc extinguishing chamber structure may be adopted for the main arc extinguishing assembly 23a and the angular arc extinguishing assembly 33a instead of the single arc extinguishing plate structure in the present embodiment.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. An intelligent star-delta starting switch, which comprises,

The switch body comprises a controller, a main contact device, a star-delta contact device, a first incoming line terminal group, a first outgoing line terminal group and a second wiring terminal group; the number of terminals in the first incoming line terminal group, the first outgoing line terminal group and the second wiring terminal group is three; each terminal in the first wire-incoming terminal group is used for being electrically connected with a three-phase power supply, each terminal in the first wire-outgoing terminal group is used for being electrically connected with one end of a motor winding, and each terminal in the second wire-incoming terminal group is used for being electrically connected with the other end of the motor winding; the method is characterized in that: the transformer group is sleeved on the first incoming line terminal group or the first outgoing line terminal group, and the output end of the transformer group is electrically connected with the controller and used for transmitting the collected current parameters to the controller.

2. The intelligent star-delta start switch of claim 1, wherein: the transformer group comprises a transformer housing, and three transformers are arranged in the transformer housing; each terminal in the first incoming line terminal group or the first outgoing line terminal group is arranged beyond the transformer housing after penetrating through the corresponding transformer respectively.

3. An intelligent star delta start switch as set forth in claim 2, wherein: the mutual inductor housing is fastened or clamped and fixed with the shell of the switch body through screws.

4. An intelligent star delta start switch as set forth in claim 2, wherein: the mutual inductor housing comprises a mutual inductor base and a mutual inductor upper cover, and screw fastening and/or clamping fixation are adopted between the mutual inductor base and the mutual inductor upper cover; one of the transformer base and the transformer upper cover is provided with a transformer chamber with an opening, the transformer chamber is used for accommodating a transformer, and the other one of the transformer base and the transformer upper cover is used for closing the opening of the transformer chamber.

5. An intelligent star delta start switch as set forth in claim 2, wherein: the width dimension of each terminal penetrating into the transformer is larger than that of the rest part of the terminal, the width dimension of each enlarged part is larger than that of the central hole of the transformer, and the transformer housing is provided with a matching cavity matched with the enlarged part.

6. An intelligent star delta start switch as set forth in claim 2, wherein: the shell of the switch body is provided with a phase-to-phase separator at the first outlet terminal group, the transformer housing is provided with a first rib in plug-in fit with the phase-to-phase separator, and the phase-to-phase separator is in plug-in fit with the first rib to form an embedded structure; or/and, the shell of the switch body is provided with two side walls at two sides of the first outlet terminal group, the transformer housing is provided with second ribs which are staggered with the two side walls, and the staggered arrangement of the side walls and the second ribs forms an embedded structure; or/and, the shell of the switch body is provided with a bottom wall at the lower part of the first outlet terminal group, a space exists between the first outlet terminal group and the bottom wall, the transformer housing is provided with a third rib, and an embedded structure is formed in the third rib insertion space.

7. The intelligent star-delta start switch of claim 1, wherein: when the current parameter is abnormal, the controller drives the intelligent star-delta starting switch to open; the abnormal current parameter refers to abnormal current parameter caused by overload, abnormal current parameter caused by short circuit, abnormal current parameter caused by undervoltage, abnormal current parameter caused by over-current, abnormal current parameter caused by undercurrent, abnormal current parameter caused by open phase, abnormal current parameter caused by unbalanced three phases, abnormal current parameter caused by motor rotation blockage, or abnormal current parameter caused by electric leakage.

8. The intelligent star-delta start switch of claim 1, wherein: the switch body is also provided with a man-machine interaction interface, and the man-machine interaction interface is electrically connected with the controller; the man-machine interaction interface comprises a display device and/or an input key, wherein the display device is used for displaying electrical information, and the input key is used for a user to change controller information.

9. The intelligent star-delta start switch of claim 8, wherein: the height dimension of the main contact device is lower than that of the star-angle contact device, and the man-machine interaction interface is positioned above the main contact device.

10. The intelligent star-delta start switch of claim 1, wherein: the main contact device comprises a main contact assembly, a main contact support for driving the main contact assembly to be connected/disconnected, and a first electromagnetic system for driving the main contact support to move, wherein the first incoming line terminal group and the first outgoing line terminal group are electrically connected with the main contact assembly; the star-angle contact device comprises a star contact assembly, an angle contact assembly, a star contact support for driving the star contact assembly to be connected/disconnected, an angle contact support for driving the angle contact assembly to be connected/disconnected and a second electromagnetic system for driving the star contact and the angle contact support to move; the star contact support and the angle contact support are in linkage, the star contact assembly and the angle contact assembly form interlocking, the star contact assembly is in normally closed arrangement, the angle contact assembly is in normally open arrangement, and the second wiring terminal group is electrically connected with the angle contact assembly and the star contact assembly; the controller is used for controlling the on-off of the first electromagnetic system and the second electromagnetic system; when the star contact assembly and the main contact assembly are simultaneously connected, the star connection is adopted at the moment; when the angular contact assembly and the main contact assembly are simultaneously connected, the angular connection is adopted.