CN115732268A - Multi-pole DC switch - Google Patents

Abstract

The embodiment of the application provides a multi-pole direct current switch, including housing, termination and relay body, be equipped with the louvre of connecting its interior surface on the housing, termination set up in on the housing, relay body set up in the housing, termination with the relay body electricity is connected. The multipole direct current switch can make the heat that the relay body produced in time distribute to the external air environment outside the housing through the louvre, avoid the heat to pile up in the housing inside, correspondingly improve multipole direct current switch's heat dispersion, and then avoid the relay body to pile up the heat damage that probably suffers because of the heat, improve multipole direct current switch's whole working property, stability in use and life.

Description

Multi-pole DC switch

Technical Field

The application relates to the technical field of switches, in particular to a multi-pole direct-current switch.

Background

In the related art, a multi-pole switch is a relay that can control a plurality of branches simultaneously. The heat dissipation performance of the multi-pole switch is not good, resulting in the degradation of the overall performance of the multi-pole switch.

Disclosure of Invention

The embodiment of the application provides a multi-pole direct current switch which has better heat dissipation performance.

The multi-pole direct current switch comprises a housing, a wiring device and a relay body, wherein the housing is provided with heat dissipation holes connected with the inner surface and the outer surface of the housing, the wiring device is arranged on the housing, the relay body is arranged in the housing, and the wiring device is electrically connected with the relay body.

In some embodiments, the relay body and the housing are encapsulated by potting adhesive, and a first sealing member is arranged between the relay body and the housing in the region around the heat dissipation hole, and the first sealing member is arranged around the heat dissipation hole.

In some embodiments, the relay body includes a contact device and a driving device, the contact device includes a contact bridge support, a plurality of movable contact bridges, a plurality of contact bridge springs, and a plurality of pairs of fixed contacts, each movable contact bridge is disposed on the contact bridge support through one of the contact bridge springs, each movable contact bridge and one pair of fixed contacts are disposed correspondingly, and the fixed contacts are electrically connected to the wiring device; the driving device is configured to drive the contact bridge supporting piece to move so as to enable the movable contact bridge to be connected with or separated from the pair of fixed contacts corresponding to the movable contact bridge, and the heat dissipation hole is arranged towards the driving device.

In some embodiments, the driving device includes an outer magnetic conductive cylinder, a coil, an inner magnetic conductive cylinder, a cover plate, a magnetic yoke, an armature, and a core rod, the outer magnetic conductive cylinder, the cover plate, and the magnetic yoke enclose to form a chamber, the coil, the inner magnetic conductive cylinder, and the armature are respectively disposed in the chamber, the coil is disposed between the outer magnetic conductive cylinder and the inner magnetic conductive cylinder, the core rod slidably penetrates through the magnetic yoke, and two ends of the core rod are respectively connected to the armature and the contact bridge support; the heat dissipation holes are arranged towards the outer magnetic conduction cylinder.

In some embodiments, the outer magnetic conduction barrel and the housing are encapsulated by potting adhesive, and a first sealing element is arranged between the outer magnetic conduction barrel and a region of the housing surrounding the heat dissipation hole, and the first sealing element is arranged around the heat dissipation hole.

In some embodiments, the relay body includes an arc quenching device including an arc chute; the arc extinguishing cover is arranged on one side of the driving device, which is far away from the heat dissipation holes, and the arc extinguishing cover and the housing are sealed to enclose to form an arc extinguishing chamber; the contact device is arranged in the arc extinguish chamber, and the static contact extends out of the arc extinguish chamber to be electrically connected with the wiring device.

In some embodiments, the arc extinguishing device further comprises a permanent magnet, the permanent magnet is respectively arranged on two opposite sides of the movable contact bridge along the extending direction of the movable contact bridge, and the permanent magnet and the movable contact bridge are arranged at intervals.

In some embodiments, the arc extinguishing device further comprises a vent tube extending into the arc chamber through the cover shell and the arc chute in sequence, the vent tube configured to evacuate air from the arc chamber and inject an inert gas into the arc chamber.

In some embodiments, the wiring device includes a plurality of wiring banks, and each of the wiring banks is electrically connected to one of the stationary contacts.

In some embodiments, the housing comprises a base, a shield plate and an isolation baffle, the base and the shield plate enclose to form an accommodating cavity portion, the relay body is embedded in the accommodating cavity portion, the isolation baffle is arranged on the shield plate and located outside the accommodating cavity portion, and two adjacent static contacts are isolated by the isolation baffle.

In some embodiments, the multi-pole dc switch further includes a control device, the control device includes a control circuit board and a circuit board cover, the control circuit board is configured to control the driving device, and the circuit board cover is disposed on the control circuit board and connected to and enclosed by the cover case.

This application embodiment is through setting up the housing, termination and relay body, and set up the louvre of connecting its interior surface on the housing, make the heat that the relay body produced in time give off to the external air environment outside the housing through the louvre, can avoid the heat to pile up in the housing is inside, correspondingly improve multipolar direct current switch's heat dispersion, and then avoid the relay body to pile up the heat damage that probably suffers because of the heat, improve multipolar direct current switch's overall working property, stability in use and life.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a front view block diagram of a multi-pole dc switch provided in some embodiments of the present application;

fig. 2 is a cross-sectional block diagram of a multi-pole dc switch provided in some embodiments of the present application;

fig. 3 is another cross-sectional block diagram of a multi-pole dc switch provided in some embodiments of the present application;

fig. 4 is a top view block diagram of a multi-pole dc switch provided in some embodiments of the present application.

Description of the main element symbols:

1-cover, 11-base, 111-heat dissipation hole, 112-accommodation groove, 12-shield plate, 13-isolation baffle, 2-wiring device, 21-wiring bar, 3-relay body, 31-contact device, 311-contact bridge support, 312-movable contact bridge, 313-contact bridge spring, 314-static contact, 315-auxiliary contact, 32-drive device, 321-outer magnetic cylinder, 322-coil, 323-inner magnetic cylinder, 324-cover plate, 325-magnetic yoke, 326-armature, 327-core rod, 328-reaction spring, 329-compensation spring, 320-connection pad, 32 a-chamber, 33-arc-extinguishing device, 331-arc-extinguishing cover, 332-permanent magnet, 333-vent pipe, 334-plug, 33 a-arc-extinguishing chamber, 335-airtight cover, 34-first seal, 35-second seal, 36-third seal, 4-control device, 41-control circuit board, 42-circuit board cover.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

"A and/or B" includes the following three combinations: a alone, B alone, and a combination of A and B.

The use of "adapted to" or "configured to" in this application means open and inclusive language that does not exclude devices adapted to or configured to perform additional tasks or steps. Additionally, the use of "based on" means open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values may in practice be based on additional conditions or values beyond those stated.

In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

As shown in fig. 1 to 2, the present embodiment provides a multi-pole dc switch, which includes a housing 1, a wiring device 2 and a relay body 3, and has a better heat dissipation performance. Here, the number of poles of the multi-pole dc switch can be determined according to actual needs, and the number is at least two; accordingly, the multi-pole dc switch may be of different types such as a bipolar dc switch capable of controlling two branches simultaneously, a tripolar dc switch capable of controlling three branches simultaneously, a quadrupole dc switch capable of controlling more than one branch simultaneously, and the like.

The housing 1 belongs to the insulating casing of a multi-pole dc switch, and provides insulation and mechanical protection for the electrical components located inside it. The housing 1 is provided with heat dissipation holes 111 connected to the inner and outer surfaces thereof, and heat inside the housing 1 can be dissipated to the external air environment through the heat dissipation holes 111 along with the air flow.

The connection device 2 is arranged on the housing 1, and the multipole direct current switch can be connected to a corresponding power network through the connection device 2. The relay body 3 is arranged in the housing 1, belongs to a main structure for realizing the function of a relay, and correspondingly realizes the synchronous switch switching of a plurality of branches in a power utilization network; the connection device 2 and the relay body 3 are electrically connected in order to connect the relay body 3 into a corresponding electricity network.

During the switching process, the relay body 3 generates a large amount of heat, so that the ambient temperature inside the housing 1 gradually rises. Benefit from the louvre 111 that is equipped with on the housing 1, the heat that relay body 3 produced can in time distribute to the external air environment outside the housing 1 through louvre 111 in, can avoid the heat to pile up in housing 1 is inside, correspondingly improves multipolar direct current switch's heat dispersion, and then avoids relay body 3 to pile up the heat damage that probably suffers because of the heat, improves multipolar direct current switch's whole working property, stability in use and life.

In some embodiments, the relay body 3 and the housing 1 are encapsulated by potting adhesive. The type of the pouring sealant can be determined according to actual needs, and the type of the pouring sealant can be liquid polyurethane compound and the like; during potting, the potting adhesive can be poured into a gap space between the relay body 3 and the housing 1 in a mechanical or manual mode, and the potting adhesive is cured into a thermosetting polymer insulating material under a normal temperature or heating condition. The pouring sealant is used for pouring and curing between the relay body 3 and the housing 1, so that the electric strength, moisture resistance and salt mist resistance of the multi-pole direct current switch can be improved, and the insulation safety performance between the relay body 3 and the housing 1 can be improved.

Here, a first sealing member 34 may be disposed between the relay body 3 and the region around the heat dissipation hole 111 on the case 1 to eliminate a gap between the relay body 3 and the region around the heat dissipation hole 111 on the case 1, so as to form a good seal in the peripheral region of the heat dissipation hole 111, thereby preventing the potting adhesive from leaking along the heat dissipation hole 111, and ensuring potting reliability and insulation reliability.

When the first seal 34 is used for sealing connection, the first seal 34 may be disposed around the heat dissipation hole 111; one side of the first sealing member 34 is closely abutted with the relay body 3, and the other side is closely abutted with the region around the heat dissipation hole 111 on the case 1, so that the gap between the relay body 3 and the region around the heat dissipation hole 111 on the case 1 is eliminated, and a good sealing effect is obtained. The type of the first sealing member 34 may be determined according to actual needs, and may be a type such as a sealing ring, a sealing gasket, etc., which is not limited in the embodiments of the present application.

In some examples, a region of the case 1 surrounding the heat dissipation hole 111 may be provided with a housing groove portion 112 such as an annular groove, the housing groove portion 112 being provided around the heat dissipation hole 111; the first seal member 34 is embedded in the accommodation groove portion 112 along one side in the thickness direction thereof, and the other side protrudes outside the accommodation groove portion 112 to be in close abutment with the relay body 3, thereby achieving good sealing.

The configuration of the relay body 3 may be determined according to actual needs, and the embodiment of the present application is not limited thereto. In some embodiments, the relay body 3 may comprise a contact arrangement 31 and a drive arrangement 32. The contact device 31 includes a contact bridge support 311, a plurality of movable contact bridges 312, a plurality of contact bridge springs 313 and a plurality of pairs of fixed contacts 314, wherein each movable contact bridge 312 is disposed on the contact bridge support 311 through one contact bridge spring 313; each movable contact bridge 312 is disposed corresponding to a pair of fixed contacts 314, and each fixed contact 314 is electrically connected to the wiring device 2. In other words, the number of the movable contact bridges 312 is equal to the number of the pairs of the fixed contacts 314, and the plurality of movable contact bridges 312 and the plurality of pairs of fixed contacts 314 are arranged in a one-to-one correspondence.

Here, the driving device 32 is configured to drive the contact bridge 312 support member 311 to move, and the contact bridge support member 311 and the contact bridge spring 313 thereon drive the plurality of movable contact bridges 312 to move synchronously, so that each movable contact bridge 312 is engaged with or separated from the pair of fixed contacts 314 corresponding thereto, thereby implementing switching control of the plurality of branches.

Here, the heat radiation hole 111 is provided toward the driving device 32, and the heat radiation hole 111 and the driving device 32 are provided to face each other. On one hand, when the driving device 32 performs the driving action, the heat generated by the driving device 32 can be dissipated through the heat dissipating holes 111 in time, so that the driving device 32 is ensured to be in a better working temperature range, and the influence of temperature rise is eliminated or reduced; on the other hand, the heat dissipation hole 111 is disposed towards the driving device 32, so that the heat dissipation hole 111 faces towards the region with better insulation safety on the relay body 3, thereby avoiding the occurrence of electrical leakage and causing safety accidents.

The type of the driving device 32 may be determined according to actual needs, and may be a type such as a mechanical driving structure, an electromagnetic driving structure, and the like, which is not limited in this embodiment of the application. In some examples, the driving device 32 may employ an electromagnetic driving structure, and accordingly includes an outer magnetic cylinder 321, a coil 322, an inner magnetic cylinder 323, a cover plate 324, a yoke 325, an armature 326, and a core rod 327. Here, the outer magnetic conductive cylinder 321 has an open end and a closed end oppositely arranged along the extending direction thereof, and the cover plate 324 is covered on the open end of the outer magnetic conductive cylinder 321; the cover plate 324 has an opening, and the magnetic yoke 325 is embedded in the opening of the cover plate 324, so that the outer magnetic cylinder 321, the cover plate 324 and the magnetic yoke 325 enclose to form a chamber 32a. The coil 322, the inner magnetic conductive cylinder 323 and the armature 326 are respectively disposed in the chamber 32a, the coil 322 is disposed between the outer magnetic conductive cylinder 321 and the inner magnetic conductive cylinder 323, the core rod 327 slidably penetrates the magnetic yoke 325, and two ends of the core rod 327 are respectively connected to the armature 326 and the contact bridge support 311.

In the working process, the coil 322 generates magnetic flux when being electrified, the magnetic flux forms a magnetic loop through the outer magnetic conduction cylinder 321, the cover plate 324, the magnetic yoke 325, the armature 326 and the inner magnetic conduction cylinder 323, so that the armature 326 is magnetized to generate electromagnetic force, the electromagnetic force acts on the armature 326 to drive the core rod 327 to move, the core rod 327 drives the contact bridge 312 support part 311 to move, the contact bridge 312 is connected with the pair of static contacts 314 corresponding to the contact bridge, and then a plurality of branches controlled by the multi-pole direct current switch are simultaneously closed and conducted; after the coil 322 is powered off, the magnetic and electromagnetic forces of the armature 326 disappear, and the core rod 327 loses the driving force to separate the contact bridge 312 from the pair of stationary contacts 314 corresponding to the contact bridge, so that the plurality of branches controlled by the multi-pole dc switch are simultaneously powered off.

Here, the heat dissipation holes 111 may be disposed toward the outer magnetic cylinder 321. When the driving device 32 is driven electromagnetically, considerable heat is generated by the coil 322, the magnetic conductive loop, and the like; by the position arrangement, the heat can be dissipated outwards along the heat dissipation holes 111 in time, and the influence of temperature rise is avoided or reduced.

For example, the outer magnetic conduction cylinder 321 and the housing 1 may be encapsulated by potting adhesive, and the first sealing element 34 is disposed between the outer magnetic conduction cylinder 321 and the housing 1 in the region around the heat dissipation hole 111, where the first sealing element 34 is disposed around the heat dissipation hole 111. For example, a first sealing member 34 may be disposed between the closed end of the outer magnetic cylinder 321 and the region of the casing 1 surrounding the heat dissipation hole 111. For the corresponding features of the potting adhesive and the first sealing member 34, please refer to the corresponding descriptions above, which are not repeated herein.

Illustratively, the drive device 32 may also include a counter force spring 328. The core rod 327 is sleeved with a reaction spring 328, and two ends of the reaction spring 328 are respectively connected to the yoke 325 and the armature 326. When the coil 322 is energized to magnetize the armature 326 and generate an electromagnetic force, when the electromagnetic force overcomes the reaction force of the reaction spring 328, the armature 326 may move to drive the core rod 327 to move synchronously; after the coil 322 is powered off, the magnetic and electromagnetic forces of the armature 326 disappear, and the reaction force of the reaction spring 328 drives the armature 326 and the core rod 327 to reset, so that the contact bridge supporting member 311 moves reversely to drive the movable contact bridge 312 to be separated from the pair of fixed contacts 314 corresponding to the movable contact bridge, and further, a plurality of branches controlled by the multi-pole direct current switch are simultaneously switched off.

Illustratively, the drive device 32 may further include a compensating spring 329. The compensation spring 329 is sleeved on one end of the core rod 327 far away from the armature 326, and two ends of the compensation spring 329 are respectively connected with the core rod 327 and the contact bridge supporting piece 311; the elastic connection between the core rod 327 and the contact bridge supporting member 311 can be realized by using the compensation spring 329, a certain relative adjustment space is provided between the core rod 327 and the contact bridge supporting member 311, and the transmission elasticity and the transmission reliability between the core rod 327 and the contact bridge supporting member 311 are increased.

Illustratively, the driving device 32 may further include a connection pad 320. The connection gasket 320 is disposed on the outer peripheral side of the mandrel 327 and between one end of the contact bridge support 311 close to the armature 326 and the mandrel 327, and when the armature 5 and the mandrel 327 are driven by the iron 326 to move, the mandrel 327 can drive the contact bridge 312 support 311 to move synchronously through the connection gasket 320. By using the connecting spacer 320, the diameter of the mandrel 327 can be reduced, resulting in a more compact structure and saving in material and processing costs. When the drive device 32 further comprises a compensation spring 329, the core 327 can first be moved relative to the contact bridge support 311 when the armature 326 moves the core 327

The compensation spring 329 is moved and stretched, so that the connection gasket 320 gradually approaches the contact bridge support part 311, and the contact bridge 312 support part 311 is driven by the connection gasket 320 to synchronously move after the connection gasket 320 contacts the contact bridge support part 311; after the coil 322 is powered off, when the armature 326 and the core rod 327 are reset, the core rod 327 drives the supporting member 311 of the contact bridge 312 to synchronously move and reset through the compensation spring 329, so that the contact bridge 312 is separated from the pair of stationary contacts 314 corresponding to the contact bridge.

In some examples, the contact arrangement 31 may further comprise an auxiliary contact 315 for sensing the switch on-off state of the multi-pole dc switch 5 switch. When the moving contact is connected with a pair of fixed contacts 314 corresponding to the moving contact, the auxiliary contact 315 is triggered to send out an induction measuring signal to feed back that the multi-pole direct current switch is closed and conducted; when the movable contact is separated from the pair of stationary contacts 314 corresponding to the movable contact, the auxiliary contact 315 is no longer triggered, and the feedback multi-pole dc switch is turned off. The type of the auxiliary contact 315 may be determined according to actual needs, and a type such as a micro switch may be used, which is not limited in this embodiment of the application.

In some examples, the relay body 3 may include an arc extinguishing device 33, and the arc extinguishing device 33 may include

An arc chute 331. The arc-extinguishing chamber 331 can be arranged on one side of the driving device 32 far away from the heat dissipation holes 111, and the arc-extinguishing chamber 331 and the housing 1 are sealed and enclosed to form an arc-extinguishing chamber 33a; the contact device 31 is disposed inside the arc-extinguishing chamber 33a, and the stationary contact 314 extends outside the arc-extinguishing chamber 33a to be electrically connected with the wiring device 2.

Illustratively, the sealing compound 5 can be filled between the arc extinguishing chamber 331 and the housing 1 and between the driving device 32 and the housing 1. Here, a second seal 35 may be provided between the arc chute 331 and the housing 1, a first seal 34 may be provided between the end of the driving device 32 remote from the arc chute 331 and the housing 1, and a third seal 36 may be provided between the end of the driving device 32 close to the arc chute 331 and the housing 1; for example, when the driving device 32 includes the outer magnetic conductive cylinder 321 and the cover plate 324, the open end of the outer magnetic conductive cylinder 321 may be disposed toward the arc-extinguishing chamber 331, the first sealing member 34 may be disposed between the closed end of the outer magnetic conductive cylinder 321 and the region of the casing 1 surrounding the heat dissipation hole 111, and the third sealing member 36 may be disposed between the cover plate 324 and the casing 1. Thus, good sealing between the arc extinguishing chamber 331 and the housing 1 and between the driving device 32 and the housing 1 can be realized, the pouring sealant is prevented from leaking into the arc extinguishing chamber 33a or the driving device 32 when the pouring sealant is poured, and the structural reliability is ensured. The types of the second sealing element 35 and the third sealing element 36 may be determined according to actual needs, and may be, for example, sealing rings, sealing gaskets, and the like, which are not limited in the embodiments of the present application.

As shown in fig. 3, the arc extinguishing device 33 may further include a permanent magnet 332, for example. The moving contact bridge 312 is provided with permanent magnets 332 respectively along two opposite sides of the extending direction thereof, and the permanent magnets 332 and the moving contact bridge 312 are arranged at intervals. The permanent magnet 332 can drive the arc laterally to elongate the arc and increase the arc voltage to rapidly extinguish the arc in a gaseous atmosphere. Illustratively, the arc-extinguishing device 33 may further include an airtight cover 335, and the airtight cover 335 is disposed between the arc-extinguishing cover 331 and the housing 1 to increase airtightness and arc-extinguishing effect of the arc-extinguishing device 33.

For example, the arc extinguishing device 33 may further include a vent pipe 333, and the vent pipe 333 extends into the arc extinguishing chamber 33a through the housing 1 and the arc extinguishing chamber 331 in sequence. The breather pipe 333 is configured to evacuate air inside the arc extinguishing chamber 33a and inject inert gas into the arc extinguishing chamber 33 a. After the potting adhesive is used for potting, air in the arc extinguishing chamber 33a can be pumped and exhausted through the vent pipe 333 to enable the arc extinguishing chamber 33a to reach a vacuum state or a state close to the vacuum state, and then inert gas such as nitrogen is injected into the arc extinguishing chamber 33a through the vent pipe 333, so that electric arcs in the arc extinguishing chamber 33a are easy to extinguish, and a good arc extinguishing effect is achieved.

For example, the arc extinguishing device 33 may further include a plug 334, the plug 334 is inserted into a mounting hole of the arc-extinguishing chamber 331, and the vent pipe 333 is inserted into a mounting hole of the plug 334, such that the vent pipe 333 is tightly mounted on the arc-extinguishing chamber 331 by the plug 334. The material of the pipe plug 334 can be determined according to actual needs, and can be made of elastic materials such as rubber, elastic plastics and the like; accordingly, the plug 334 may be inserted into the mounting hole of the arc-extinguishing chamber 331 with interference, and the vent pipe 333 may be inserted into the mounting hole of the plug 334 with interference, ensuring the airtightness of the connection.

The type of the wiring device 2 can be determined according to actual needs, and the embodiment of the present application is not limited thereto. As shown in fig. 1 to 4, in some examples, the wiring device 2 may include a plurality of wiring blocks 21, and each wiring block 21 is electrically connected to one of the fixed contacts 314, so as to electrically connect the multi-pole dc switch and the external power grid.

The configuration of the housing 1 may be determined according to actual needs, and the embodiment of the present application is not limited thereto. In some examples, the enclosure 1 may include a base 11, a shield plate 12, and an isolation barrier 13. The base 11 may have mounting structures such as mounting holes, mounting ears, etc. to allow the multi-pole dc switch to be secured in a desired position for use. The base 11 and the protective cover plate 12 enclose to form an accommodating cavity part, the relay body 3 can be embedded in the accommodating cavity part, and the fixed contact 314 on the relay body 3 extends out of the accommodating cavity part; the heat dissipation hole 111 is disposed on the base 11 and connects the outer surface of the base 11 and the accommodation chamber. The isolation baffle 13 is disposed on the protective cover plate 12 and outside the containing cavity, and two adjacent fixed contacts 314 are separated by the isolation baffle 13, so as to ensure an electrical gap and a creepage distance. For example, the base 11 and the arc-extinguishing chamber 331 may enclose hermetically to form the arc-extinguishing chamber 33a, and potting may be performed between the arc-extinguishing chamber 331 and the base 11 and between the driving device 32 and the base 11 by potting adhesive; a second seal 35 may be provided as described above between the arc chute 331 and the base 11, a first seal 34 may be provided as described above between the end of the drive mechanism 32 remote from the arc chute 331 and the base 11, and a third seal 36 may be provided as described above between the end of the drive mechanism 32 proximate to the arc chute 331 and the base 11. Illustratively, the gas-tight enclosure 335 may be disposed between the arc-extinguishing chamber 331 and the housing 1.

Illustratively, when the wiring device 2 includes a plurality of wiring blocks 21, two adjacent wiring blocks 21 are also blocked by the isolation barrier 13, so as to ensure an electrical gap and a creepage distance. For example, the isolation baffle 13 may have a plurality of baffle portions, and one baffle portion is disposed between two adjacent fixed contacts 314.

In some examples, the multi-pole dc switch may further include a control device 4, the control device 4 includes a control circuit board 41 and a circuit board cover 42, the control circuit board 41 is configured to control the driving device 32, so that the driving device 32 performs a driving action according to a required control requirement; the circuit board cover 42 covers the control circuit board 41 and is connected and enclosed with the housing 1 to perform safety protection on the control circuit board 41. Illustratively, the driving device 32 may include the aforementioned coil 322, and the control circuit board 41 may be configured to control the current magnitude of the coil 322. For example, when the armature 326 needs to be attracted to engage the moving contact bridge 312 and the fixed contact 314, the control circuit board 41 may control a larger current to be applied to the coil 322 to provide a sufficient electromagnetic force; and the current control plate may control the current to the coil 322 to a lower value after the armature 326 is in place.

The multi-pole dc switch provided in the embodiments of the present application is described in detail above, and the principle and the implementation of the present application are explained herein by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A multi-pole direct current switch is characterized by comprising a housing, a wiring device and a relay body, wherein the housing is provided with heat dissipation holes connected with the inner surface and the outer surface of the housing, the wiring device is arranged on the housing, the relay body is arranged in the housing, and the wiring device is electrically connected with the relay body.

2. The multi-pole dc switch of claim 1, wherein the relay body and the case are encapsulated by an encapsulating adhesive, and a first sealing member is disposed between the relay body and a region of the case surrounding the heat dissipation hole, the first sealing member being disposed around the heat dissipation hole.

3. The multi-pole direct current switch according to claim 1, wherein the relay body comprises a contact device and a driving device, the contact device comprises a contact bridge support, a plurality of movable contact bridges, a plurality of contact bridge springs and a plurality of pairs of fixed contacts, each movable contact bridge is arranged on the contact bridge support through one contact bridge spring, each movable contact bridge and one pair of fixed contacts are arranged correspondingly, and the fixed contacts are electrically connected with the wiring device respectively; the driving device is configured to drive the contact bridge supporting piece to move so as to enable the movable contact bridge to be connected with or separated from the pair of fixed contacts corresponding to the movable contact bridge, and the heat dissipation hole is arranged towards the driving device.

4. The multi-pole dc switch according to claim 3, wherein the driving device comprises an outer magnetic conductive cylinder, a coil, an inner magnetic conductive cylinder, a cover plate, a magnetic yoke, an armature, and a core rod, the outer magnetic conductive cylinder, the cover plate, and the magnetic yoke enclose to form a chamber, the coil, the inner magnetic conductive cylinder, and the armature are respectively disposed in the chamber, the coil is disposed between the outer magnetic conductive cylinder and the inner magnetic conductive cylinder, the core rod is slidably disposed on the magnetic yoke, and two ends of the core rod are respectively connected to the armature and the contact bridge support; the heat dissipation holes are arranged towards the outer magnetic conduction cylinder.

5. The multi-pole dc switch of claim 4, wherein the outer magnetic conductive sleeve and the housing are encapsulated by a potting compound, and a first sealing member is disposed between the outer magnetic conductive sleeve and a region of the housing surrounding the heat dissipation hole, the first sealing member surrounding the heat dissipation hole.

6. The multi-pole direct current switch of claim 3, wherein the relay body includes an arc quenching device comprising an arc chute; the arc extinguishing cover is arranged on one side of the driving device, which is far away from the heat dissipation holes, and the arc extinguishing cover and the housing are sealed to enclose to form an arc extinguishing chamber; the contact device is arranged in the arc extinguish chamber, and the static contact extends out of the arc extinguish chamber to be electrically connected with the wiring device.

7. The multi-pole DC switch according to claim 6, wherein said arc extinguishing device further comprises a permanent magnet, said moving contact bridge is provided with said permanent magnet along opposite sides of the extending direction thereof, and said permanent magnet and said moving contact bridge are spaced apart.

8. The multi-pole DC switch of claim 6, wherein the arc quenching device further comprises a vent tube extending into the quenching chamber through the shroud and the quenching chamber in sequence, the vent tube configured to evacuate air from the quenching chamber and inject an inert gas into the quenching chamber.

9. The multi-pole direct current switch according to claim 3, wherein the housing comprises a base, a shielding plate and an isolation baffle, the base and the shielding plate enclose to form a containing cavity, the relay body is embedded in the containing cavity, the isolation baffle is arranged on the shielding plate and located outside the containing cavity, and two adjacent static contacts are isolated by the isolation baffle.

10. The multipole direct current switch of claim 3, further comprising a control device comprising a control circuit board configured to control said drive device and a circuit board cover disposed on said control circuit board and in contiguous surrounding relation with said housing.

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