CN114864328A

CN114864328A - Breaking device

Info

Publication number: CN114864328A
Application number: CN202210475578.7A
Authority: CN
Inventors: 刘磊; 钟建艺; 陈默; 张金泉
Original assignee: Xiamen Hongfa Electrical Safety and Controls Co Ltd
Current assignee: Xiamen Hongfa Electrical Safety and Controls Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-08-05
Also published as: DE112022001379T5; WO2023206807A1

Abstract

The embodiment of the invention discloses a breaking device, which comprises a contact unit and an arc extinguishing unit, wherein the contact unit comprises a plurality of moving contacts and static contacts, the moving contacts are arranged side by side along a first direction, and each moving contact can be driven to be in contact with or separated from the static contact, so that the connection and the disconnection of the breaking device are realized; the arc extinguishing unit includes arc extinguishing subassembly and at least one first spacing member, and the arc extinguishing subassembly sets up with the contact unit interval, and forms total arc extinguishing space between arc extinguishing subassembly and contact unit, and each first spacing member is connected in the arc extinguishing subassembly and extends to the contact unit to separate into two at least sub-arc extinguishing spaces with total arc extinguishing space in the first direction.

Description

Breaking device

Technical Field

The embodiment of the invention relates to the technical field of electronic devices, in particular to a breaking device.

Background

A circuit breaker is a switching device capable of carrying and breaking a current under a normal circuit condition and also capable of carrying and breaking a current under an abnormal circuit condition within a predetermined time. With the development of new energy technology, the rated working voltage of the direct current breaker is higher and higher, and reaches 1500V at present. Along with the improvement of working voltage, the market puts higher requirements on the reliable breaking performance of the circuit breaker, and the difficulty of short-circuit breaking is greatly increased.

In the prior art, technical means such as lengthening the arc by enlarging the distance, pushing and cooling the arc by burning the gas-generating material, pushing the arc by enhancing the magnetic field, etc. have appeared, but these methods cannot reliably break the circuit under the high voltage of direct current.

The short-circuit current of the direct current circuit breaker is smaller than that of the alternating current circuit breaker, so the generated Lorentz magnetic force is small, and the arc is difficult to be rapidly introduced into an arc extinguishing chamber for arc extinguishing by means of traditional single air blowing or magnetic blowing. In addition, the direct current does not have natural zero crossing points, so the direct current molded case circuit breaker is difficult to break the direct current short-circuit current, especially the high-voltage direct current short-circuit current.

Disclosure of Invention

The embodiment of the invention provides a breaking device capable of improving breaking reliability.

The breaking device comprises a contact unit and an arc extinguishing unit, wherein the contact unit comprises a plurality of moving contacts and static contacts, the moving contacts are arranged side by side along a first direction, and each moving contact can be driven to be in contact with or separated from the static contact, so that the breaking device is switched on and off; the arc extinguishing unit includes arc extinguishing subassembly and at least one first spacing member, the arc extinguishing subassembly with the contact unit interval sets up, and the arc extinguishing subassembly with form total arc extinguishing space between the contact unit, each first spacing member connect in the arc extinguishing subassembly and to the contact unit extends, and will total arc extinguishing space is in divide into two at least sub-arc extinguishing spaces in the first direction.

According to some embodiments of the invention, the contact unit further comprises a contact support, a plurality of the movable contacts being connected to the contact support;

the contact support can swing relative to the arc extinguishing unit and the fixed contact along a swinging direction so as to drive each moving contact to swing relative to the fixed contact, and the swinging direction is vertical to the first direction;

each first divider is disposed between the contact support and the arc extinguishing assembly;

the shape of the surface of the first separating element facing the contact support is adapted to the shape of the outer wall of the contact support.

According to some embodiments of the invention, a side surface of the first divider facing the contact support is a first arcuate surface; the contact support has a second arcuate surface that matches the arc of the first arcuate surface.

According to some embodiments of the invention, the first separator comprises:

the connecting part is connected with the arc extinguishing assembly; and

the separating part is connected to one side, away from the arc extinguishing assembly, of the connecting part and used for isolating a plurality of disjuncted electric arcs formed by the moving contacts and the static contact when the disjuncted device is in an off state and enabling the disjuncted electric arcs to be respectively arranged in at least two arc extinguishing sub-spaces.

According to some embodiments of the invention, a dimension of the partition portion is larger than a dimension of the connection portion in the first direction.

According to some embodiments of the present invention, each of the movable contacts has a movable contact, the fixed contact has a fixed contact, and each of the movable contacts is configured to be respectively contacted with or separated from the fixed contact;

during switching of the breaking device between the on state and the off state, an orthographic projection of the movable contact to the first partition along the first direction falls within a side face of the first partition.

According to some embodiments of the present invention, the first separators are plate-shaped, and each of the first separators extends in a second direction, and is parallel to and spaced apart from each other in the first direction, and the second direction is perpendicular to the first direction.

According to some embodiments of the invention, the arc extinguishing unit further comprises two second dividers respectively connected to two opposite sides of the arc extinguishing assembly along the first direction and each extending toward the contact unit;

the arc extinguishing assembly, the contact unit and the two second separating pieces surround the total arc extinguishing space.

According to some embodiments of the invention, each of the second dividers is parallel to each of the first dividers.

According to some embodiments of the present invention, the arc extinguishing assembly includes a plurality of arc extinguishing grids, each of the arc extinguishing grids extends along the first direction, and the plurality of arc extinguishing grids are arranged side by side along a second direction, and the second direction is perpendicular to the first direction; the first separator is perpendicular to the arc chute pieces.

According to some embodiments of the present invention, each of the movable contacts is in contact with or separated from the fixed contact along a respective motion track;

when the number of the sub-arc extinguishing spaces is odd, the moving contact corresponding to the sub-arc extinguishing space in the middle position is shorter than the moving contact in the rest moving contacts along the first direction.

According to some embodiments of the present invention, each of the movable contacts includes a contact portion and a movable contact connected to the contact portion for contacting with or separating from the fixed contact;

each of the contact portions of each of the movable contacts is aligned in the first direction; in the direction of the motion trail, the height of the moving contact corresponding to the sub-arc extinguishing space in the middle position is greater than the height of the moving contacts of the rest moving contacts.

One embodiment of the above invention has at least the following advantages or benefits:

according to the breaking device provided by the embodiment of the invention, the arc extinguishing unit comprises at least one first partition, each first partition is connected with the arc extinguishing assembly and extends towards the contact unit so as to partition the total arc extinguishing space between the arc extinguishing assembly and the contact unit into at least two sub arc extinguishing spaces in the first direction, so that the diameters of a broken arc and an arc root can be effectively compressed, the movement of the broken arc and high-temperature gas and high-ionization media between the arc extinguishing assembly and the contact unit is directionally limited, the broken arc is forced to move towards the arc extinguishing assembly in an accelerated manner, and the breaking reliability is improved. In addition, because each sub-arc extinguishing space is smaller than the total arc extinguishing space, the diameter of the broken arc is compressed in a narrow space, so that the arc voltage is increased, and the breaking reliability is further improved.

Drawings

Fig. 1 is a schematic structural diagram of a contact unit and an arc extinguishing unit of a dc frame circuit breaker according to an embodiment of the present invention.

Fig. 2 and 3 are schematic structural diagrams of the contact unit and the arc extinguishing unit of the one-pole circuit of the dc frame circuit breaker according to the embodiment of the present invention from two perspectives, respectively.

Fig. 4 is a side view of a dc frame circuit breaker illustrating a first spacer and a movable contact according to an embodiment of the present invention.

Fig. 5 shows a side view of a dc frame circuit breaker of an embodiment of the present invention, showing a second divider.

Fig. 6 is a schematic structural diagram of an arc extinguishing unit according to an embodiment of the present invention.

Fig. 7 is an exploded view of an arc extinguishing unit according to an embodiment of the present invention.

Fig. 8 shows a schematic view of a contact unit of an embodiment of the invention.

Fig. 9 shows a partial enlarged view at a in fig. 8.

Fig. 10 shows a side view of an arc extinguishing unit according to an embodiment of the present invention.

Wherein the reference numerals are as follows:

100. contact unit

110. Moving contact

111. Contact part

112. Movable contact

112', moving contact

120. Static contact

121. Static contact

130. Contact support

131. Second arc surface

132. The first part

133. The second part

200. Arc extinguishing unit

210. Arc extinguishing assembly

211. Arc extinguishing grid plate

212. Arc extinguishing side plate

213. Arc extinguishing depression bar

214. Arc extinguishing support

220. A first separator

221. Connecting part

222. Partition part

223. First arc surface

230. Second spacer

300. Breaking electric arc

D1, first direction

D2, second direction

D3, direction of oscillation

S1 Total arc extinguishing space

S11 arc extinguishing sub-space

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

As shown in fig. 1, fig. 1 is a schematic structural diagram of a contact unit 100 and an arc extinguishing unit 200 of a dc frame circuit breaker according to an embodiment of the present invention. The breaking device of the embodiment of the invention can be a breaker, and particularly, the breaker can be a direct current frame breaker and can also be an alternating current breaker.

Of course, it is understood that the breaking device may also be other electronic devices having a breaking function, such as a fuse, etc.

It should be noted that the dc frame circuit breaker shown in fig. 1 includes two-pole circuit portions, and the structures of the pole circuit portions are substantially the same. For the sake of simplifying the illustration, the following description will be made by taking the circuit breaker as an example to show only one pole circuit portion, but it should not be limited thereto.

Each pole circuit portion of the breaking device includes a contact unit 100 and an arc extinguishing unit 200. The contact unit 100 includes a plurality of moving contacts 110 and stationary contacts 120, the plurality of moving contacts 110 are arranged side by side along a first direction D1, and each moving contact 110 can be driven to contact with or separate from the stationary contact 120, so as to turn on or off the breaking device. The movable contact 110 has a motion track relative to the stationary contact 120, and the movable contact 110 can be closed or separated from the stationary contact 120 along the motion track. When the movable contact 110 and the fixed contact 120 are separated, an open arc 300 is generated between the movable contact 110 and the fixed contact 120. The arc extinguishing unit 200 is used for extinguishing an arc 300 generated between the fixed contact 120 and the movable contact 110. To facilitate understanding, fig. 4 and 5 schematically illustrate an interrupted arc 300 generated between the movable contact 110 and the stationary contact 120.

It is to be understood that the terms "comprises" and "comprising," as well as any variations thereof, in the embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or may alternatively include other steps or elements inherent to such process, method, article, or apparatus.

It should be noted that the breaking device according to the embodiment of the present invention further includes an arc extinguishing magnet (not shown in the figure), and the breaking arc 300 generated between the fixed contact 121 and the movable contact 112 is affected by the magnetic field through the arc extinguishing magnet, so that the breaking arc 300 is stretched after entering the arc extinguishing unit 200, and the arc extinguishing effect is achieved.

The number of the arc extinguishing magnets is not limited, and the arc extinguishing magnets may be connected to both sides of the arc extinguishing unit 200, or may be disposed at a side of the arc extinguishing unit 200 facing away from the contact unit 100.

As shown in fig. 1 to 3, fig. 2 and 3 respectively show schematic structural diagrams of a contact unit 100 and an arc extinguishing unit 200 of a one-pole circuit of a dc frame circuit breaker according to an embodiment of the present invention from two perspectives. The arc extinguishing unit 200 includes an arc extinguishing assembly 210 and at least one first divider 220, the arc extinguishing assembly 210 is spaced apart from the contact unit 100, and a total arc extinguishing space S1 is formed between the arc extinguishing assembly 210 and the contact unit 100, and each first divider 220 is connected to the arc extinguishing assembly 210 and extends toward the contact unit 100, and divides the total arc extinguishing space S1 into at least two sub arc extinguishing spaces S11 in a first direction D1.

It should be noted that, when the movable contact 110 is in contact with the fixed contact 120, the disconnecting device is in an on state. When the moving contact 110 is separated from the fixed contact 120, the breaking device is in an off state. When the moving contact 110 and the stationary contact 120 are separated from each other, the breaking arc 300 is easily generated therebetween. When the movable contact 110 starts to separate, the contact pressure acting between the fixed contact 120 and the movable contact 110 will decrease, the contact area will also decrease, and the contact resistance and the heat released by the movable contact 110 and the fixed contact 120 will increase. Since the heat is concentrated in a small volume, the contact metals of the moving contact 110 and the stationary contact 120 are heated to a high temperature and melted, so that a liquid metal bridge is formed between the moving contact 110 and the stationary contact 120, and finally the metal bridge is pulled apart, so that a transitional or stable breaking arc 300 is formed between the stationary contact 120 and the moving contact 110.

According to the breaking device of the embodiment of the invention, the arc extinguishing unit 200 comprises at least one first partition 220, each first partition 220 is connected to the arc extinguishing assembly 210 and extends towards the contact unit 100, and the total arc extinguishing space S1 between the arc extinguishing assembly 210 and the contact unit 100 is divided into at least two sub arc extinguishing spaces S11 in the first direction D1, so that the diameters of the broken arc 300 and arc roots can be effectively compressed, the movement of high-temperature gas and high-ionization medium between the broken arc 300 and between the arc extinguishing assembly 210 and the contact unit 100 is directionally limited, the broken arc 300 is forced to move towards the arc extinguishing assembly 210 in an accelerated manner, and the breaking reliability is improved. In addition, since each sub-arc extinguishing space S11 is smaller than the total arc extinguishing space S1, the diameter of the divided arc 300 is compressed in a narrow space, thereby increasing the arc voltage and further improving the reliability of the division.

It is understood that the number of the sub-arc extinguishing spaces S11 may be two, three or four and more, and correspondingly, the number of the first divider 220 may be one, two or three and more. For example, when the number of the sub-arc extinguishing spaces S11 is three, the number of the first partitions 220 is two, and the two first partitions 220 are spaced apart in the first direction D1 to divide the total arc extinguishing space S1 into three sub-arc extinguishing spaces S11.

In the present embodiment, the number of the sub-arc extinguishing spaces S11 is three, and the number of the first partitions 220 is two.

In addition, the number of the movable contacts 110 corresponding to each arc extinguishing space S11 may be one, two, three or other numbers.

In the present embodiment, the contact unit 100 includes nine movable contacts 110, the nine movable contacts 110 are spaced apart in the first direction D1, and the nine movable contacts 110 are divided into three groups, each group including three movable contacts 110. The three groups of moving contacts 110 correspond to the three arc extinguishing sub-spaces S11 respectively.

As shown in fig. 2, a group of movable contacts 110 in a middle position is taken as an example. When the breaking device is switched between the on state and the off state, the respective moving contact 112 of the set of moving contacts 110 reciprocates within the sub-arc extinguishing space S11 in the intermediate position. By the arrangement of the first spacer 220, the respective movable contact 112 of the movable contact 110 located at the middle position can be spaced apart from the movable contact 112 of the respective movable contact 110 located at the both side positions.

With continued reference to fig. 1 to fig. 3, the contact unit 100 further includes a contact support 130, and the plurality of movable contacts 110 are connected to the contact support 130. The contact support 130 is swingable along a swing direction D3 with respect to the arc extinguishing unit 200 and the stationary contact 120 to drive each movable contact 110 to swing with respect to the stationary contact 120, wherein the swing direction D3 is perpendicular to the first direction D1. Each first spacer 220 is disposed between the contact support 130 and the arc extinguishing assembly 210.

In the present embodiment, the plurality of movable contacts 110 are connected to the contact support 130, and when the contact support 130 swings along the swing direction D3, each movable contact 110 also swings along with the contact support 130 to contact with or separate from the fixed contact 120.

Of course, in some embodiments, the moving contact 110 may also move along a straight line to contact or separate from the fixed contact 120.

The shape of the surface of each first spacer 220 facing the contact holder 130 is adapted to the shape of the outer wall surface of the contact holder 130. Thus, when the movable contact 110 is driven by the contact support 130 to swing, the contact support 130 and the first spacer 220 do not have any motion interference.

The surface of the first spacer 220 on the side facing the contact support 130 is a first arc surface 223, and the contact support 130 has a second arc surface 131 adapted to the arc of the first arc surface 223. The arc degrees of the first arc-shaped surface 223 and the second arc-shaped surface 131 are matched, so that during the swinging process of the contact support 130, a small gap can be kept between the first arc-shaped surface 223 of the first partition 220 and the second arc-shaped surface 131 of the contact support 130 as much as possible, and the independence between the sub-arc extinguishing spaces S11 is further ensured.

As shown in fig. 4, fig. 4 is a side view of the dc frame circuit breaker according to the embodiment of the present invention, in which the first spacer 220 and the movable contacts 110 are shown. The first partition 220 of the embodiment of the present invention includes a connection part 221 and a partition 222. The connecting portion 221 is connected to the arc extinguishing assembly 210, the separating portion 222 is connected to a side of the connecting portion 221, which faces away from the arc extinguishing assembly 210, and the separating portion 222 is used for isolating a plurality of separated arcs 300 formed by the plurality of movable contacts 110 and the fixed contact 120 when the separating device is in an off state, and enabling the plurality of separated arcs 300 to be respectively arranged in the at least two sub-arc extinguishing spaces S11.

Specifically, referring to fig. 2, in the present embodiment, the total arc extinguishing space S1 is divided into three sub arc extinguishing spaces S11, and each sub arc extinguishing space S11 corresponds to three movable contacts 110. When the breaking device is in an off state, nine breaking arcs 300 are formed between the nine moving contacts 110 and the fixed contacts 120 respectively. Nine divided arcs 300 are evenly divided into three groups by three partitions 222, each group including three divided arcs 300. Three groups of divided arcs 300 are respectively arranged in the three sub-arc extinguishing spaces S11.

Of course, in some embodiments, the number of the movable contacts 110 corresponding to each sub-arc extinguishing space S11 may also be different. For example, the number of the movable contacts 110 corresponding to the sub-arc extinguishing space S11 located at the middle position may be two, the number of the movable contacts 110 corresponding to the sub-arc extinguishing space S11 located at one side may be four, and the number of the movable contacts 110 corresponding to the sub-arc extinguishing space S11 located at the other side may be three.

With continued reference to fig. 4, each of the movable contacts 110 includes a contact portion 111 and a movable contact 112, the contact portion 111 is connected to the contact support 130, and the movable contact 112 is connected to the contact portion 111. The stationary contact 120 has a stationary contact 121, and each of the movable contacts 112 is adapted to be respectively contacted with or separated from the stationary contact 121.

It is understood that the movable contact 112 and the contact portion 111 may be provided separately or integrally. Of course, the stationary contact 121 and the stationary contact 120 may be disposed separately or integrally.

During the switching of the breaking device between the on state and the off state, an orthographic projection of the movable contact 112 to the first partition 220 in the first direction D1 falls within a side face of the first partition 220. Further, an orthographic projection of the movable contact 112 in the first direction D1 to the first spacer 220 falls within a side surface of the partition 222.

In the present embodiment, since the orthographic projection of the movable contact 112 to the first separating member 220 along the first direction D1 always falls within the side surface of the first separating member 220 during the moving process, the broken arc 300 generated between each movable contact 110 and the fixed contact 120 can always be separated by the first separating member 220.

As shown in fig. 3, in one embodiment, the first dividers 220 are plate-shaped, and each of the first dividers 220 extends along a second direction D2 and is parallel to and spaced apart from each other along the first direction D1, and the second direction D2 is perpendicular to the first direction D1.

As shown in fig. 10, fig. 10 is a side view of an arc extinguishing unit according to an embodiment of the present invention. The size of the partition 222 of the first partition 220 is greater than the size of the connection 221 of the first partition 220 in the first direction D1. Since the separating portion 222 is used to separate the plurality of breaking arcs 300, the size of the separating portion 222 is increased, so that the separating portion 222 can be prevented from being burnt by the arcs. In addition, since the size of the separating portion 222 is larger than that of the connecting portion 221, the cross-sectional area of the portion of the sub-extinguishing space S11 near the arc extinguishing assembly 210 is larger than that of the portion near the contact support 130, so that the sub-extinguishing space S11 with a "large top and small bottom" is formed, and the function of preventing the arc from back-streaming is achieved.

In the present embodiment, the first spacer 220 has a flat plate shape, and the thickness of the spacer 222 is larger than the thickness of the connecting portion 221.

As shown in fig. 1 to 3 and 5, fig. 5 is a side view of the dc frame circuit breaker according to the embodiment of the present invention, in which a second divider 230 is shown. The arc extinguishing unit 200 of the embodiment of the present invention further includes two second partitions 230, and the two second partitions 230 are respectively connected to two opposite sides of the arc extinguishing assembly 210 along the first direction D1 and extend toward the contact unit 100. The arc extinguishing assembly 210, the contact unit 100 and the two second spacers 230 enclose a total arc extinguishing space S1. Since the two second separators 230 are respectively connected to two opposite sides of the arc extinguishing assembly 210 along the first direction D1 and extend toward the contact unit 100, the two second separators 230 isolate the plurality of disjuncting arcs 300 in the total arc extinguishing space S1, and can prevent the disjuncting arcs 300 from overflowing and burning other parts of the disjuncting apparatus. Meanwhile, the gas production can be increased, and the arc can be pushed to move towards the arc extinguishing assembly 210 by the aid of large gas production, so that breaking is facilitated.

In one embodiment, each second separator 230 is plate-shaped and parallel to each first separator 220.

In the present embodiment, one of the second partitions 230, two of the first partitions 220, and the other second partition 230 are sequentially disposed along the first direction D1. The two first and

second partitions

220 and 230 collectively divide the total arc extinguishing space S1 into three sub arc extinguishing spaces S11.

It is understood that the flow areas between the sub-arc extinguishing spaces S11 may be equal or unequal.

In one embodiment, the first and

second spacers

220 and 230 are made of gas-generating material, and compress the broken arc 300 by generating gas to increase the arc voltage, thereby pushing the arc into the arc-extinguishing assembly 210. It is understood that the gas generating material means a material that is gasified at a high temperature. For example, the gas generating material may be any one or any combination of the following materials: nylon (PA66), polyoxymethylene or melamine.

Portions of the contact support 130 may be made of a gas generating material. Specifically, as shown in fig. 5, the contact support 130 may include a first portion 132 and a second portion 133. The first portion 132 is connected to the movable contact 110, and the second portion 133 is connected to the first portion 132. Wherein the second portion 133 faces the arc extinguishing assembly 210 when the breaking device is in the off-state. The second portion 133 is made of a gas generating material.

As shown in fig. 6 and 7, fig. 6 is a schematic structural view of an arc extinguishing unit 200 according to an embodiment of the present invention. Fig. 7 is an exploded view of an arc extinguishing unit 200 according to an embodiment of the present invention. As an example, the arc extinguishing assembly 210 according to the embodiment of the present invention includes a plurality of arc extinguishing grids 211, two arc extinguishing side plates 212, two arc extinguishing pressing bars 213, and two arc extinguishing brackets 214.

Each arc chute 211 is a plate-like structure and is substantially rectangular. Each arc chute 211 extends along the first direction D1, and the plurality of arc chute 211 are arranged side by side along a second direction D2, and the second direction D2 is perpendicular to the first direction D1. The two arc extinguishing brackets 214 are disposed opposite to each other and respectively disposed on two opposite end surfaces of the arc chute pieces 211 along the second direction D2. The two arc-extinguishing side plates 212 are oppositely arranged and respectively arranged on two opposite side surfaces of the plurality of arc-extinguishing grid pieces 211 along the first direction D1, and the two arc-extinguishing side plates 212 are respectively connected with the two arc-extinguishing brackets 214 to form an accommodating space in a surrounding manner, and the plurality of arc-extinguishing grid pieces 211 are accommodated in the accommodating space. The two arc extinguishing pressing bars 213 extend along the second direction D2 and are disposed on the top surfaces of the arc extinguishing grids 211 along two opposite sides of the first direction D1, so as to limit the arc extinguishing grids 211 in the accommodating space.

As an example, the arc extinguishing side plate 212 and the arc extinguishing bracket 214 may be connected by a snap connection, but not limited thereto.

The first spacer 220 is connected to a side of the plurality of arc chute pieces 211 facing the contact unit 100. The first spacer 220 is perpendicular to the arc chute pieces 211.

As shown in fig. 2, 8 and 9, fig. 8 is a schematic view showing a contact unit according to an embodiment of the present invention. Fig. 9 shows a partial enlarged view at a in fig. 8. Each moving contact 110 is contacted with or separated from the fixed contact 120 along the respective motion track, so as to realize the on-off of the breaking device. When the number of the sub-arc extinguishing spaces S11 is odd, the moving contact 110 corresponding to the sub-arc extinguishing space S11 in the middle position has a shorter moving track than the moving tracks of the rest of the moving contacts 110 along the first direction D1.

For the sake of easy understanding, nine moving contacts 110 and three sub-arc extinguishing spaces S11 shown in fig. 2 are taken as an example. It can be understood that, since the motion trajectory of the three moving contacts 110 in the middle position is shorter than the motion trajectories of the remaining six moving contacts 110 on the left and right sides, on the premise that the contact supports 130 swing at the same angle, the three moving contacts 110 in the middle position will be "closed first and then separated", that is, in the process of switching the breaking device from the off state to the on state, the three moving contacts 110 in the middle position will contact the stationary contacts 120 prior to the remaining moving contacts 110, and in the process of switching the breaking device from the on state to the off state, the three moving contacts 110 in the middle position will be separated from the stationary contacts 120 later than the remaining moving contacts 110.

Through the design, the breaking electric arc 300 is preferentially generated between the moving contact 110 and the fixed contact 120 at the middle position, so that the rest moving contacts 110 can be protected, and the temperature rise is reduced. In addition, when the contact of the moving contact 110 at the middle position is worn, the breaking electric arcs 300 are generated between the rest moving contacts 110 and the static contact 120, and the generated gas pushes the breaking electric arcs 300 to the arc extinguishing component 210, so that rapid arc extinguishing is realized.

It is understood that the moving trace of the moving contact 110 in the middle position is different from the moving traces of the other moving contacts 110, and the moving contacts with different heights can be arranged. Specifically, each of the movable contacts 110 includes a contact portion 111 and a movable contact 112, the movable contact 112 is connected to the contact portion 111 for contacting with or separating from the stationary contact 120, and the contact portion 111 is connected to the contact support 130. The contact portions 111 of the movable contacts 110 are aligned in the first direction D1. In the direction of the motion trajectory, the movable contact 112 of the movable contact 110 corresponding to the sub-arc extinguishing space S11 in the middle position has a height greater than the height of the movable contacts 112 of the remaining movable contacts 110.

In connection with fig. 2 and 9, as an example, nine contact portions 111 of nine movable contacts 110 are aligned in the first direction D1, and a height h2 of the movable contact 112' of three movable contacts 110 in the middle position is greater than a height h1 of the movable contacts 112 of the remaining six movable contacts 110. Thus, when the breaking device is switched between the on state and the off state, the three movable contacts 112' at the middle position are contacted with the fixed contact 120 in preference to the rest movable contacts 112, and the switching-on and switching-off are realized.

Furthermore, the difference between the height h2 of the movable contact 112' of the movable contact 110 corresponding to the sub-arc extinguishing space S11 at the intermediate position and the height h1 of the movable contacts 112 of the rest of the movable contacts 110 is 1.5mm to 2.5mm, that is, h2-h1 is 1.5mm to 2.5mm, preferably h2-h1 is 2 mm.

Of course, in some embodiments, in order to realize that the motion trajectory of the movable contact 110 in the middle position is different from the motion trajectory of the rest of the movable contacts 110, it is also possible to design a plurality of movable contacts 110 to be staggered in the first direction D1. Specifically, still by taking the nine movable contacts 110 shown in fig. 2 as an example, the three movable contacts 110 in the middle position are closer to the fixed contact 120 than the other movable contacts 110, so that the movable contacts 110 in the middle position can also be "closed before opened" under the condition that the nine movable contacts 112 of the nine movable contacts 110 have the same height.

In summary, the advantages and the benefits of the breaking device according to the embodiment of the present invention at least include:

according to the breaking device of the embodiment of the invention, the arc extinguishing unit 200 comprises at least one first partition 220, each first partition 220 is connected to the arc extinguishing assembly 210 and extends towards the contact unit 100, and the total arc extinguishing space S1 between the arc extinguishing assembly 210 and the contact unit 100 is divided into at least two sub arc extinguishing spaces S11 in the first direction D1, so that the diameters of the broken arc 300 and arc roots can be effectively compressed, the movement of high-temperature gas and high-ionization medium between the broken arc 300 and between the arc extinguishing assembly 210 and the contact unit 100 is directionally limited, the broken arc 300 is forced to move towards the arc extinguishing assembly 210 in an accelerated manner, and the breaking reliability is improved. In addition, since each sub-arc extinguishing space S11 is smaller than the total arc extinguishing space S1, the diameter of the divided arc 300 is compressed in a narrow space, so that the arc voltage is increased, and the reliability of the division is further improved.

The breaking device of the embodiment of the invention effectively solves the problems of long direct-current high-voltage low-voltage critical breaking arc burning time and long direct-current high-voltage short-circuit current breaking arc burning time, effectively reduces the arc burning energy and can effectively solve the problem of low direct-current high-voltage electricity service life.

It is understood that the various embodiments/implementations provided by the present invention can be combined with each other without contradiction, and are not illustrated herein.

In the embodiments of the invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. Specific meanings of the above terms in the embodiments of the invention may be understood by those of ordinary skill in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred device or unit must have a specific direction, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

In the description herein, reference to the term "one embodiment," "some embodiments," "a specific embodiment," or the like, 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 an embodiment of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer 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.

The above embodiments are merely preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the invention should be included in the protection scope of the embodiments of the invention.

Claims

1. A breaking device, comprising:

the contact unit comprises a plurality of moving contacts and fixed contacts, the moving contacts are arranged side by side along a first direction, and each moving contact can be driven to be in contact with or separated from the fixed contact so as to realize the connection and disconnection of the breaking device; and

the arc extinguishing unit comprises an arc extinguishing assembly and at least one first partition, the arc extinguishing assembly is arranged at intervals with the contact unit, a total arc extinguishing space is formed between the arc extinguishing assembly and the contact unit, and the first partition is connected with the arc extinguishing assembly and extends to the contact unit and divides the total arc extinguishing space into at least two sub arc extinguishing spaces in the first direction.

2. The severing device of claim 1, wherein said contact unit further comprises a contact support to which a plurality of said movable contacts are connected;

the contact support can swing relative to the arc extinguishing unit and the fixed contact along a swinging direction to drive each moving contact to swing relative to the fixed contact, and the swinging direction is vertical to the first direction;

3. The severing device of claim 2, wherein a side surface of the first separator facing the contact support is a first arcuate surface; the contact support has a second arcuate surface that matches the arc of the first arcuate surface.

4. A breaking device according to claim 1, characterized in that the first spacer comprises:

a connecting part connected to the arc extinguishing assembly; and

5. A breaking device according to claim 4, characterized in that along the first direction the dimension of the separation portion is greater than the dimension of the connection portion.

6. The breaking device of claim 1, wherein each moving contact has a moving contact, the stationary contact has a stationary contact, and each moving contact is configured to be contacted with or separated from the stationary contact;

7. The cutting device of claim 1, wherein the first dividers are plate-shaped, each extending in a second direction and arranged parallel to and spaced apart from each other in the first direction, the second direction being perpendicular to the first direction.

8. The severing device of any one of claims 1 to 7, wherein the arc extinguishing unit further comprises two second partitions respectively connected to two opposite lateral sides of the arc extinguishing assembly along the first direction and each extending towards the contact unit;

9. A cutting device according to claim 8, characterized in that each of the second spacers is parallel to each of the first spacers.

10. The severing device of claim 1, wherein the arc quenching assembly includes a plurality of arc quenching bars, each arc quenching bar extending in the first direction, and the plurality of arc quenching bars being arranged side by side in a second direction perpendicular to the first direction; the first separator is perpendicular to the arc chute pieces.

11. The breaking device of claim 1, wherein each moving contact is in contact with or separated from the fixed contact along a respective motion track;

12. The cutting device of claim 11, wherein each movable contact comprises a contact portion and a movable contact, the movable contact is connected to the contact portion for contacting with or separating from the fixed contact;