CN219738775U - DC switch - Google Patents

Abstract

The utility model provides a direct current switch, includes electromagnetic system and contact mechanism, electromagnetic system includes the coil, electromagnetic system is used for driving when the circular telegram contact mechanism switches on, direct current switch still includes fault protection device, fault protection device includes current monitoring module, control module and auxiliary switch module, current monitoring module is used for monitoring the main loop electric current that flows through contact mechanism, and current monitoring module is connected with control module and is used for sending monitoring signal to control module, and auxiliary switch module establishes ties in the power supply loop for electromagnetic system's coil, and control module is connected with auxiliary switch module's control end, can make auxiliary switch module disconnection power supply loop for electromagnetic system's coil power supply to auxiliary switch module, makes direct current switch's main loop disconnection, can provide effectual fault protection for direct current switch.

Description

DC switch

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to a direct current switch.

Background

Along with the continuous promotion of new energy automobile's power, current fuse and direct current relay can't reliably provide effective protection for high-power battery and contravariant system, especially when taking place overload or short circuit trouble, lead to the switching apparatus to damage easily. In addition, although the existing partial switching electric appliance is integrated with a fault protection function, after a fault occurs, parts for realizing the fault protection function are easy to damage, and the whole switching electric appliance needs to be replaced, so that the problems of difficult replacement, high cost and the like are solved.

Disclosure of Invention

The utility model aims to overcome at least one defect of the prior art and provide a direct current switch.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a direct current switch, includes electromagnetic system and contact mechanism, electromagnetic system includes the coil, electromagnetic system is used for driving when the circular telegram contact mechanism switches on, direct current switch still includes fault protection device, fault protection device includes current monitoring module, control module and auxiliary switch module, current monitoring module is used for monitoring the main loop electric current that flows through contact mechanism, and current monitoring module is connected with control module and is used for sending monitoring signal to control module, and auxiliary switch module establishes ties in the power supply loop for electromagnetic system's coil, and control module is connected with auxiliary switch module's control end, can make auxiliary switch module disconnection power supply loop for electromagnetic system's coil power supply to auxiliary switch module send control signal.

Preferably, the electromagnetic system and the contact mechanism are arranged in a shell of the direct current switch, the current monitoring module is arranged outside the shell of the direct current switch, and the current monitoring module corresponds to the position of the main loop in the shell.

Preferably, the electromagnetic system further comprises a short-circuit protection device, the short-circuit protection device comprises a magnetic tripping mechanism and an auxiliary contact, the auxiliary contact and the auxiliary switch module are connected in series in a power supply loop for a coil of the electromagnetic system, and the magnetic tripping mechanism acts to push the auxiliary contact during short-circuit so that the auxiliary contact cuts off the power supply loop for the electromagnetic system before the auxiliary switch module.

Preferably, the magnetic tripping mechanism comprises a magnetic yoke and an armature movably arranged on the magnetic yoke, the magnetic yoke is provided with a channel, the channel is used for a conductor connected with the contact mechanism to pass through, and the armature is attracted and pushes the auxiliary contact when a short circuit fails, so that the auxiliary contact cuts off a power supply loop for supplying power to the electromagnetic system.

Preferably, the magnetic yoke of the short-circuit protection device comprises two side plates which are oppositely arranged, and a bottom plate connected between the two side plates, the armature is rotatably arranged on the magnetic yoke, the bottom plate and the armature are oppositely arranged, and the passage is formed by surrounding the bottom plate, the armature and the two side plates.

Preferably, the auxiliary switch module is a relay; and/or, the current monitoring module is a Hall sensor.

Preferably, a mounting groove for mounting the current monitoring module is formed in the outer side wall of the shell, the contact mechanism comprises a moving contact and a fixed contact, and the mounting groove corresponds to the moving contact or the fixed contact in the shell.

Preferably, the casing of direct current switch includes first casing and the second casing that sets up side by side, electromagnetic system includes coil, movable core, quiet iron core and reset spring, coil, movable core, quiet iron core and reset spring set up and constitute electromagnetic module in first casing, contact mechanism includes moving contact and quiet contact, moving contact and quiet contact set up and constitute contact module in the second casing, be equipped with the linkage hole that is used for dodging linkage structure on first casing and the second casing respectively, linkage passes the linkage hole, moving contact and movable core link to each other through linkage, the coil is used for driving movable core and removes, drives the moving contact through linkage structure when moving the iron core and removes.

Preferably, the current monitoring module of the fault protection device is disposed outside the second housing.

Preferably, the static contact comprises a wiring board and a contact board which are oppositely arranged, and a connecting board connected between the wiring board and the contact board, the contact board is provided with a static contact, and the current monitoring module is correspondingly arranged with the connecting board and is used for monitoring the current on the connecting board;

or, the moving contact comprises two contact parts and a connecting part connected between the two contact parts, the contact parts are provided with moving contacts, the direct current switch comprises two fixed contacts, the two fixed contacts form an avoidance space at intervals, the connecting part and the current monitoring module are oppositely arranged on two sides of the avoidance space, and the current monitoring module monitors current on the moving contact.

The direct current switch is provided with the fault protection mechanism, the auxiliary switch module of the fault protection mechanism is connected in series in the power supply loop of the coil of the electromagnetic system, the current monitoring module is used for monitoring the main loop and feeding back the monitoring signal to the control module, and when a fault is monitored, the control module sends a control signal to the auxiliary switch module, so that the auxiliary switch module cuts off the power supply loop for supplying power to the coil of the electromagnetic system, the contact mechanism of the direct current switch is cut off, the main loop of the direct current switch is cut off, and effective fault protection can be provided for the direct current switch.

In addition, the fault protection device and the short-circuit protection device can be combined for use, so that the auxiliary contact cuts off a power supply for supplying power to the electromagnetic system before the auxiliary switch module, the main circuit of the switch electric appliance is disconnected, the short-circuit protection capable of fast action is provided, then the auxiliary switch module of the fault protection device is disconnected again, the current monitoring module can monitor the current in the main circuit, overload protection can be provided, and the current monitoring module can also be used as a supplement of the short-circuit protection to avoid the fault of the short-circuit protection device.

In addition, through installing current monitoring module outside DC switch's casing, do not need to be in the same place current monitoring module and switching electrical apparatus integration, not only easy to assemble and change current monitoring module, but also be convenient for current monitoring module and other be used for assisting DC switch's module to make up the use, especially make up the use with other modules that are used for protecting DC switch.

In addition, the contact mechanism is packaged into a contact module through the second shell, and after modularization, the current monitoring module can be convenient for monitoring the current in the main loop.

Drawings

FIG. 1 is a schematic circuit diagram of a combination fault protection device and short circuit protection device of the present utility model;

FIG. 2 is a schematic circuit diagram of the fault protection device of the present utility model;

FIG. 3 is a schematic view of the structure of the second housing of the present utility model;

FIG. 4 is a schematic diagram of the current monitoring module and the moving contact according to the present utility model;

FIG. 5 is a schematic diagram of the current monitoring module and stationary contact of the present utility model;

FIG. 6 is a schematic view of another embodiment of a stationary contact of the present utility model;

FIG. 7 is a schematic circuit diagram of the short circuit protection device of the present utility model;

FIG. 8 is a schematic diagram of the short circuit protection device of the present utility model;

FIG. 9 is a side view of the short circuit protection device of the present utility model closed;

FIG. 10 is a side view of the short circuit protection device of the present utility model shown disconnected;

FIG. 11 is a schematic illustration of the mating of the protective housing with a conductor in accordance with the present utility model;

FIG. 12 is a schematic view of the structure of the protective housing of the present utility model;

FIG. 13 is a schematic diagram of a DC switch of the present utility model;

11. a current monitoring module; 12. an auxiliary switch module; 21. a magnetic trip mechanism; 22. an auxiliary contact; 23. a yoke; 24. an armature; 230. a channel; 31. an electromagnetic module; 32. a contact module; 33. a linkage structure; 34. a moving contact; 35. a stationary contact; 341. a contact portion; 342. a connection part; 350. an avoidance space; 351. a wiring board; 352. a contact plate; 353. a connecting plate; 354. an extension plate; 25. an auxiliary fixed contact; 26. an auxiliary moving contact; 27. a compression spring; 260. an operation unit; 28. a protective housing; 281. perforating; 282. a wiring hole; 283. a connection terminal; 29. a return spring; 241. a driving plate; 242. a spring plate; 243. a trigger plate; 231. a side plate; 232. a bottom plate; 233. a limit groove; 234. a limiting surface; 235. an avoidance surface; 244. a limiting plate; 283. a first protective housing; 284. a second protective housing; 2831. a first case; 2832. a first cover plate; 2841. a second case; 2842. a second cover plate; 100. a conductor.

Detailed Description

The following examples are given in connection with the accompanying drawings to further illustrate embodiments of the dc switch of the present utility model. The dc switch of the present utility model is not limited to the description of the following embodiments.

The direct current switch of this embodiment includes electromagnetic system and contact mechanism, electromagnetic system is used for driving when the circular telegram contact mechanism switches on, electromagnetic system includes coil, quiet iron core, moving iron core and reset spring, the coil is used for producing electromagnetic force and drives moving iron core to the quiet iron core direction and remove the actuation, and reset spring acts on moving iron core, produces electromagnetic force when the electrically conductive work of coil and drives moving iron core and remove the actuation to quiet iron core direction, and moving iron core makes reset spring energy storage, and when the coil loses electricity stop work, reset spring promotes moving iron core to be kept away from quiet iron core direction removal and repel. The contact mechanism comprises a fixed contact 35 and a movable contact 34, a movable iron core of the electromagnetic system can drive the movable contact 34 to move, so that the movable contact 34 is contacted with and separated from the fixed contact 35, the contact mechanism is used for realizing switching on and switching off of a switching device, and a loop where the fixed contact 35 and the movable contact 34 are located is a main loop of a direct current switch.

As shown in fig. 2-5, an improvement of the dc switch of the present embodiment is that a fault protection device is provided, where the fault protection device includes a current monitoring module 11, a control module and an auxiliary switch module 12, where the current monitoring module 11 is used to monitor a main loop current flowing through the contact mechanism, the current monitoring module 11 is connected with the control module and used to send a monitoring signal to the control module, the auxiliary switch module 12 is connected in series with a power supply loop for supplying power to a coil of the electromagnetic system, and used to control a power supply to supply power to the electromagnetic system, the control module is connected with a control end of the auxiliary switch module 12 and used to drive the auxiliary switch module 12 to be opened and closed, and the control module is capable of sending a control signal to the auxiliary switch module 12 to make the auxiliary switch module 12 disconnect the power supply loop for supplying power to the coil of the electromagnetic system. When the current monitoring module 11 monitors that the current of the main circuit fails, the control module sends a control signal to the auxiliary switch module, the auxiliary switch module 12 receives the control signal of the control module and cuts off a power supply circuit for supplying power to a coil of the electromagnetic system, so that a contact mechanism of the direct current switch is disconnected, and the main circuit is disconnected. The direct current switch of the embodiment is provided with a fault protection mechanism, which can provide effective fault protection for the direct current switch, such as overload and short circuit protection.

Preferably, the electromagnetic system and the contact mechanism are arranged in a housing of the direct current switch, the current monitoring module 11 is arranged outside the housing of the direct current switch, and the current monitoring module 11 corresponds to the position of the main loop in the housing. For example, the current monitoring module 11 is disposed outside the housing of the dc switch and corresponds to the position of the stationary contact 35 or the moving contact 34 of the contact mechanism. According to the switch device of the embodiment, the current monitoring module 11 is arranged outside the shell, and the current monitoring module 11 and the switch electrical appliance are not required to be integrated together, so that the current monitoring module 11 is convenient to install and replace, and the current monitoring module 11 and other modules for assisting the direct current switch are convenient to use in combination, and particularly the current monitoring module 11 and other modules for protecting the direct current switch are convenient to use in combination.

Further, the auxiliary switch module 12 of the present embodiment is a relay, the current monitoring module 11 of the present embodiment includes a hall sensor, and the control module of the present embodiment includes a microcontroller MCU; the Hall sensor is arranged on the outer side wall of the shell of the direct current switch, the outer side wall of the shell is provided with a mounting groove for mounting the Hall sensor, and the Hall sensor is clung to a fixed contact or a moving contact or a main loop corresponding to the inside of the shell. The hall sensor is used for collecting current signals in the main loop and transmitting the current signals to the control module, when the control module monitors that overload current or short-circuit current occurs in the current of the main loop through the hall sensor, the control module outputs control signals to control the relay to break, the auxiliary switch module 12 cuts off a power supply for supplying power to the electromagnetic system, when the coil is in power failure and stops working, the return spring pushes the movable iron core to move away from the static iron core, the movable iron core drives the movable contact 34 to separate from the static contact, and the main loop of the direct current switch is disconnected. The control module and the auxiliary switch module 12 may be disposed in the housing of the dc switch, or may be disposed outside the housing, for example, on an upper control device of the dc switch, such as an upper computer. According to the fault protection device of the embodiment, the current monitoring module 11 is arranged on the outer side wall of the shell of the direct current switch, so that the fault protection device can be assembled according to requirements, is high in adaptability, realizes current monitoring and overload and short-circuit fault protection, and is relatively slow in response speed of the electronic fault monitoring.

As shown in fig. 6-7, another improvement of the present utility model is that the switching device is provided with a short-circuit protection device, the short-circuit protection device comprises a magnetic tripping mechanism 21 and an auxiliary contact 22, the auxiliary contact 22 is used for controlling a power supply to supply power to an electromagnetic system, the auxiliary contact 22 is connected in series in a power supply loop for supplying power to a coil of the electromagnetic system, the magnetic tripping mechanism 21 comprises a magnetic yoke 23 and an armature 24 movably arranged on the magnetic yoke 23, the magnetic yoke 23 is provided with a channel 230, a conductor 100 connected with the contact mechanism passes through the channel 230, the auxiliary contact 22 comprises an action part 260 extending onto the moving track of the armature 24, the magnetic yoke 23 is used for attracting the armature 24 to push the action part 260, and the armature 24 can be attracted and pushed the action part 260 when in short-circuit fault, so that the auxiliary contact 22 breaks a power supply loop for supplying power to a coil of the electromagnetic system, and a main loop of a direct current switch breaks. In the switching device of the embodiment, when a short-circuit current occurs in the main circuit, the armature 24 can be directly attracted to act, and meanwhile, the armature 24 pushes the action part 260 to cut off the power supply for supplying power to the electromagnetic system by the auxiliary contact 22, and the direct current switch is rapidly powered off in a mechanical mode.

When a short-circuit fault occurs, the yoke 23 induces a short-circuit current, and the armature 24 is attracted and moved by the magnetic field of the huge short-circuit current to push the operation portion 260, so that the auxiliary contact 22 is disconnected from the power supply for supplying power to the electromagnetic system, and the main circuit is disconnected. Through setting up passageway 230 on yoke 23, make the main return circuit be located armature 24's side, can directly attract armature 24 action when short-circuit current appears in the main return circuit, simultaneously promote action portion 260 through armature 24, make auxiliary contact 22 cut off the power supply for electromagnetic system power supply, adopt the mechanical mode to make direct current switch cut off the power supply fast, do not need to use electronic sensor device to monitor short-circuit current, handle the signal and send out the execution instruction, not only have the characteristics that action rate is fast and protection cycle is short, can reduce the damage to direct current switch, and whole short-circuit protection device's simple structure has small and with low costs's characteristics moreover.

As shown in fig. 1, the fault protection device and the short-circuit protection device may be used in combination, because the fault protection device and the short-circuit protection device respectively cut off the power supply for the electromagnetic system at different speeds and times, the auxiliary contact 22 and the auxiliary switch module 12 are both connected in series in the power supply loop for the coil of the electromagnetic system, the magnetic tripping mechanism 21 can be attracted by the short-circuit current in the main loop and push the auxiliary contact 22, so that the auxiliary contact 22 cuts off the power supply for the electromagnetic system before the auxiliary switch module 12, the main loop of the direct-current switch is disconnected, providing fast-acting short-circuit protection, then the auxiliary switch module 12 of the fault protection device is disconnected again, the current monitoring module 11 can monitor the current in the main loop, not only provide overload protection, but also can be used as a supplement to the short-circuit protection, and avoid the fault of the short-circuit protection device.

It can be understood that the fault protection device and the short-circuit protection device can be used independently, but after the short-circuit protection device is added on the basis of the fault protection device, the auxiliary contact 22 of the short-circuit protection device is firstly opened, so that the electronic sensing device is prevented from being used for monitoring short-circuit current, processing signals and sending out execution instructions, the whole short-circuit protection period can be shortened, the power supply is further cut off quickly before the fault protection device, and the switch damage is reduced. In addition, after the fault protection device is added on the basis of the short-circuit protection device, the auxiliary switch module 12 of the fault protection device can maintain the state of cutting off the power supply, and even if the auxiliary contact 22 of the short-circuit protection device is closed again, the electromagnetic system cannot be supplied with power again, so that the situation that the main loop is electrified again before the fault is eliminated because the auxiliary contact 22 is closed again is avoided.

As shown in fig. 12, in a preferred embodiment of a dc switch, the dc switch includes an electromagnetic system, a contact mechanism, the fault protection device and the short-circuit protection device, the housing of the dc switch includes a first housing and a second housing that are disposed side by side, the electromagnetic system includes a coil, a moving iron core, a static iron core and a return spring, the coil, the moving iron core, the static iron core and the return spring are disposed in the first housing to form an electromagnetic module 31, the contact mechanism includes a moving contact 34 and a static contact 35, the moving contact 34 and the static contact 35 are disposed in the second housing to form a contact module 32, and an arc extinguishing chamber is preferably disposed in the second housing. The first shell and the second shell are respectively provided with a linkage hole for avoiding a linkage structure, the linkage structure penetrates through the linkage hole, the moving contact 34 and the moving iron core are connected through the linkage structure 33, the coil is used for driving the moving iron core to move, the moving iron core drives the moving contact 34 to move through the linkage structure 33 when moving the moving iron core, and the main loop is respectively conducted and disconnected when the moving contact 34 is contacted with and separated from the fixed contact 35. Preferably, the current monitoring module 11 of the fault protection device is disposed on an outer side wall of the second housing and is disposed corresponding to the moving contact 34 or the fixed contact 35 in the second housing. The outer side wall of the second housing is provided with a mounting groove for mounting the current monitoring module 11, and the mounting groove corresponds to the position of the moving contact 34 or the fixed contact 35 in the second housing.

In the direct current switch of the embodiment, the electromagnetic system and the contact mechanism are respectively arranged in the first shell and the second shell to respectively form the electromagnetic module 31 and the contact module 32, and the electromagnetic module 31 and the contact module 32 are connected between the movable iron core and the movable contact 34 through the linkage structure 33, so that the modularized design of the electromagnetic module 31 and the contact module 32 is realized, and the contact module 32 can facilitate the current monitoring module 11 to monitor the current in the main loop after the contact mechanism is modularized. The short-circuit protection device may be disposed in the first housing or the second housing, preferably, the short-circuit protection device includes a protection housing 28, and the magnetic trip mechanism 21 and the auxiliary contact 22 are disposed in the protection housing 28 respectively, and also modularize the short-circuit protection device, so that the whole assembly is facilitated.

Of course, as other embodiments of the dc switch, the coil, the moving core, the stationary core, and the return spring of the electromagnetic system, and the moving contact 34 and the stationary contact 35 of the contact mechanism may be mounted in the same housing of the dc switch. For example, in one embodiment, the housing of the dc switch includes a switch housing, in which an electromagnetic system, a contact mechanism, and a short-circuit protection device are disposed, that is, a coil, a moving core, a fixed core, and a return spring of the electromagnetic system, a moving contact 34 and a fixed contact 35 of the contact mechanism, and a magnetic trip mechanism 21 and an auxiliary contact 22 of the short-circuit protection device are disposed in the same switch housing. For example, in another embodiment, the dc switch includes a switch housing, where an electromagnetic system, a contact module 32 and a short-circuit protection device are disposed in the switch housing, that is, a coil, a moving iron core, a static iron core and a return spring of the electromagnetic system are disposed in the switch housing, the contact module 32 includes a second housing, and a moving contact 34 and a static contact 35 that are respectively disposed in the second housing, the second housing is disposed in the switch housing, a linkage hole for avoiding a linkage structure is disposed on the second housing, the linkage structure passes through the linkage hole, and the moving contact 34 and the moving iron core are connected by the linkage structure 33, and the moving iron core drives the moving contact 34 of the contact module 32 by the linkage structure 33.

As shown in fig. 4-5, the contact mechanism of this embodiment is provided with two fixed contacts 35 corresponding to two ends of the moving contact 34, the two fixed contacts 35 are respectively connected to the main loop, when the moving contact 34 contacts and separates from the two fixed contacts 35, the main loop is respectively turned on and off, the current monitoring module 11 is disposed corresponding to the moving contact 34, or is disposed corresponding to any fixed contact 35, the moving contact 34 includes two contact portions 341 corresponding to the two fixed contacts 35, respectively, and a connection portion 342 connected between the two contact portions 341, silver points used for contacting the fixed contacts 35 are disposed on the contact portions 341, the two fixed contacts 35 are spaced to form an avoidance space 350, the connection portion 342 and the current monitoring module 11 are relatively disposed on two sides of the avoidance space 350, and the current monitoring module 11 can avoid the two fixed contacts 35 and monitor the current on the moving contact 34.

As shown in fig. 5-6, the two fixed contacts 35 respectively include a wiring board 351 and a contact board 352 that are oppositely disposed, and a connection board 353 that is connected between the wiring board 351 and the contact board 352, the contact boards 352 of the two fixed contacts 35 are respectively provided with an extension board 354 along the same side of the second housing in the width direction, silver points that are used for contacting the contact 34 are respectively provided on the extension boards 354 as fixed contacts, the current monitoring module 11 is correspondingly disposed with the connection board 353 and is used for monitoring the current on the connection board 353, two contact portions 341 at two ends of the moving contact 34 respectively extend above the extension boards 354 of the two fixed contacts 35, and the connection boards 353 of the two fixed contacts 35 are spaced to form the avoidance space 350. It will be appreciated that the moving contact 34 and the fixed contact 35 may also be shaped or implemented using other prior art techniques, yet still be able to collect the current in the main loop through the current monitoring module 11.

As shown in fig. 8-10, the auxiliary contact 22 includes an auxiliary fixed contact 25, an auxiliary moving contact 26, and a pressing spring 27 connected to the auxiliary moving contact 26, one of the auxiliary fixed contact 25 and the auxiliary moving contact 26 is connected to a coil of the electromagnetic system, the other is connected to a power supply for supplying power to the electromagnetic system, the pressing spring 27 is used for driving the auxiliary moving contact 26 to contact with the auxiliary fixed contact 25, so that the power supply supplies power to the electromagnetic system, the auxiliary moving contact 26 is provided with an action part 260 extending onto an action track of the armature 24, the action part 260 is located between the armature 24 and the main circuit, and when the armature 24 is attracted by the yoke 23 and pushes the action part 260 in a short circuit, the auxiliary moving contact 26 can be driven to separate from the auxiliary fixed contact 25 against the action of the pressing spring 27, so as to cut off the power supply for supplying power to the electromagnetic system.

Further, the short-circuit protection device includes a protection casing 28, the magnetic tripping mechanism 21 and the auxiliary contact 22 are respectively disposed in the protection casing 28, a perforation 281 and two wire connecting holes 282 are respectively disposed in the protection casing 28, wire connecting terminals 283 are respectively disposed in the two wire connecting holes 282, the wire connecting terminals 283 in the two wire connecting holes 282 are respectively connected with the auxiliary moving contact 26 and the auxiliary fixed contact 25, the perforation 281 and the channel 230 are correspondingly disposed, and the perforation 281 is used for avoiding the conductor 100 of the main circuit.

The magnetic tripping mechanism 21 and the auxiliary contact 22 are respectively arranged in the protective shell 28, and the magnetic tripping mechanism 21 and the auxiliary contact 22 are connected with the outside through the perforation 281 and the two wiring holes 282, so that the modularization of the short-circuit protection device is realized, and the short-circuit protection device has the characteristics of flexible use and convenient installation. In addition, the present embodiment shows the conductor 100 connected to the main circuit, but other parts of the main circuit may pass through the channel 230 and the through hole 281.

As shown in fig. 8-10, the armature 24 is connected to an armature return spring 29, the armature 24 is rotatably mounted on the yoke 23, the armature return spring 29 is used for driving the armature 24 to move away from the conductor 100 of the main circuit, and when the armature 24 rotates under the action of the armature return spring 29, the armature 24 moves close to the main circuit. The armature return spring 29 of the present embodiment is a tension spring connected between the armature 24 and the yoke 23, and the armature return spring 29 may be a torsion spring, which falls within the protection scope of the present utility model.

Further, the armature 24 includes a driving plate 241, and a spring plate 242 and a trigger plate 243 respectively disposed on the driving plate 241, the spring plate 242 is used for being connected with the armature return spring 29, the trigger plate 243 is used for pushing the actuating portion 260 of the auxiliary contact 22, the spring plate 242 and the trigger plate 243 are respectively disposed at an oblique angle to the driving plate 241, and the oblique angles between the spring plate 242 and the trigger plate 243 are respectively different from the driving plate 241.

Further, the magnetic yoke 23 of the short-circuit protection device is U-shaped, the magnetic yoke 23 includes two opposite side plates 231, and a bottom plate 232 respectively connected between the two side plates 231, the armature 24 is disposed between the two side plates 231 and is respectively rotationally connected with the two side plates 231, the bottom plate 232 is opposite to the armature 24, and the channel 230 is defined between the bottom plate 232, the armature 24 and the two side plates 231. Since the armature 24 is also disposed between the two side plates 231, the main circuit passes through the passage 230 so that the armature 24 is disposed opposite to the main circuit, and has the characteristics of simple structure and convenient assembly. The U-shaped magnetic yoke 23 not only can enable the magnetic field around the conductor 100 to be closed-loop, reduce magnetic leakage and increase the action speed of the armature, but also has the characteristic of simple structure, and can facilitate the installation and positioning of the armature 24. The bottom plate 232 is disposed opposite the armature 24, and the passage 230 is defined between the bottom plate 232, the armature 24, and two side plates 231.

Further, a V-shaped limit groove 233 is formed in the side plate 231, the limit groove 233 includes a limit surface 234 and an avoidance surface 235 that are disposed opposite to each other, the armature 24 is provided with a limit plate 244 that is inserted into the limit groove 233, the armature return spring 29 is used for driving the armature 24 to drive the limit plate 244 to move toward the limit surface 234, and the avoidance surface 235 is used for avoiding the limit plate 244 when the armature 24 moves toward the conductor 100 of the main circuit.

It will be appreciated that the armature 24 may be rotatably mounted to the yoke 23 by other means, such as forming a circular hole in the yoke 23, inserting the armature 24 into the circular hole for rotational connection, or providing a slide slot in the yoke 23, such that the armature 24 is mounted to the yoke 23 in a direct motion instead of rotation. In addition, the limiting groove 233 also adopts a U-shape or other special-shaped structures, which belongs to the protection scope of the present utility model.

As shown in fig. 11-12, the protection housing 28 includes a first protection housing 283 and a second protection housing 284, the magnetic trip mechanism 21 is disposed in the first protection housing 283, the auxiliary contact 22 is disposed in the second protection housing 284, the first protection housing 283 is provided with a through hole 281, the second protection housing 284 is disposed above the through hole 281, two wire connection holes 282 are disposed on a side surface of the second protection housing 284 away from the through hole 281, and the two wire connection holes 282 are respectively provided with a wire connection terminal 283.

Further, the first protection casing 283 includes a first box 2831 and a first cover 2832 covering the first box 2831, the second protection casing 284 includes a second box 2841 and a second cover 2842 covering the second box 2841, the second box 2841 is connected with the first cover 2832, the first cover 2832 is provided with a perforation 281 on one side of the second protection casing 284, two half holes are respectively provided on the second box 2841 and the second cover 2842, and the half holes on the second box 2841 are used for forming the wiring hole 282 with the half holes on the second cover 2842. The protective housing 28 is also compact and easy to assemble based on the modular design.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (10)

1. A direct current switch, includes electromagnetic system and contact mechanism, electromagnetic system includes the coil, electromagnetic system is used for when circular telegram drive contact mechanism switches on, its characterized in that: the direct current switch further comprises a fault protection device, the fault protection device comprises a current monitoring module (11), a control module and an auxiliary switch module (12), the current monitoring module (11) is used for monitoring current flowing through a main loop of the contact mechanism, the current monitoring module (11) is connected with the control module and used for sending monitoring signals to the control module, the auxiliary switch module (12) is connected in series in a power supply loop for a coil of the electromagnetic system, the control module is connected with a control end of the auxiliary switch module (12), and the control signals can be sent to the auxiliary switch module (12) to enable the auxiliary switch module (12) to be disconnected to be a power supply loop for supplying power to the coil of the electromagnetic system.

2. The direct current switch of claim 1, wherein: the electromagnetic system and the contact mechanism are arranged in a shell of the direct current switch, the current monitoring module (11) is arranged on the outer side of the shell of the direct current switch, and the current monitoring module (11) corresponds to the position of the main loop in the shell.

3. The direct current switch of claim 1, wherein: the electromagnetic system is characterized by further comprising a short-circuit protection device, wherein the short-circuit protection device comprises a magnetic tripping mechanism (21) and an auxiliary contact (22), the auxiliary contact (22) and the auxiliary switch module (12) are connected in series in a power supply loop for a coil of the electromagnetic system, and the magnetic tripping mechanism (21) acts to push the auxiliary contact (22) during short-circuit, so that the auxiliary contact (22) is disconnected from the power supply loop for supplying power to the electromagnetic system before the auxiliary switch module (12).

4. A dc switch as claimed in claim 3, wherein: the magnetic tripping mechanism (21) comprises a magnetic yoke (23) and an armature (24) movably arranged on the magnetic yoke (23), the magnetic yoke (23) is provided with a channel (230), the channel (230) is used for a conductor (100) connected with the contact mechanism to pass through, and the armature (24) is attracted and pushes the auxiliary contact (22) when in short circuit fault, so that the auxiliary contact (22) cuts off a power supply loop for supplying power to an electromagnetic system.

5. The direct current switch of claim 4, wherein: the magnetic yoke (23) of the short-circuit protection device comprises two side plates (231) which are oppositely arranged, and a bottom plate (232) connected between the two side plates (231), the armature (24) is rotatably arranged on the magnetic yoke (23), the bottom plate (232) and the armature (24) are oppositely arranged, and the channel (230) is formed by surrounding the bottom plate (232), the armature (24) and the two side plates (231).

6. The direct current switch of claim 1, wherein: the auxiliary switch module (12) is a relay; and/or the current monitoring module (11) is a Hall sensor.

7. The direct current switch of claim 2, wherein: the outer side wall of the shell is provided with a mounting groove for mounting the current monitoring module (11), the contact mechanism comprises a moving contact (34) and a fixed contact (35), and the mounting groove corresponds to the moving contact (34) or the fixed contact (35) in the shell.

8. The direct current switch of claim 1, wherein: the casing of direct current switch includes first casing and the second casing that sets up side by side, electromagnetic system includes coil, movable core, quiet core and reset spring, coil, movable core, quiet core and reset spring set up and constitute electromagnetic module (31) in first casing, contact mechanism includes moving contact (34) and quiet contact (35), moving contact (34) and quiet contact (35) set up and constitute contact module (32) in the second casing, be equipped with the linkage hole that is used for dodging linkage structure (33) on first casing and the second casing respectively, linkage passes the linkage hole, moving contact (34) and movable core link to each other through linkage structure (33), the coil is used for driving movable core and removes, moves through linkage structure (33) drive moving contact (34) when the movable core removes.

9. The direct current switch of claim 8, wherein: the current monitoring module (11) of the fault protection device is arranged on the outer side of the second shell.

10. The direct current switch of claim 9, wherein: the static contact (35) comprises a wiring board (351) and a contact board (352) which are oppositely arranged, and a connecting board (353) connected between the wiring board (351) and the contact board (352), the contact board (352) is provided with a static contact, and the current monitoring module (11) is arranged corresponding to the connecting board (353) and is used for monitoring the current on the connecting board (353);

or, moving contact (34) include two contact portion (341) to and connect connecting portion (342) between two contact portion (341), be equipped with the moving contact on contact portion (341), direct current switch includes two stationary contact (35), two stationary contact (35) interval formation dodges space (350), connecting portion (342) and current monitoring module (11) are in relatively setting up dodge the both sides in space (350), current on current monitoring module (11) monitoring moving contact (34).