CN221573840U - Breaking unit and circuit breaker - Google Patents

Abstract

The disclosure provides a breaking unit, which comprises a shell, a first fixed contact with a first contact end, a second fixed contact with a second contact end and a moving contact assembly with a first moving contact and a second moving contact. The first group of arc extinguishing grid plates are arranged on a first side of the moving contact assembly in a first direction; and the second group of arc extinguishing grid plates are arranged on a second side opposite to the first side in the first direction of the moving contact assembly, and one end of each second group of arc extinguishing grid plates is adjacent to the second contact end of the second fixed contact. The first arc striking piece is used for guiding an electric arc generated when the first moving contact and the first fixed contact are disconnected to the first end of the first group of arc extinguishing grid pieces; the second arc striking piece is used for guiding an electric arc generated when the second moving contact and the second fixed contact are disconnected to one end, far away from the second contact end, of the second group of arc extinguishing grid pieces. A circuit breaker including the breaking unit is also provided.

Description

Breaking unit and circuit breaker

Technical Field

The present disclosure relates to the electrical field, and in particular, to a breaking unit and a switching device including the same.

Background

The main structure of the circuit breaker comprises a moving contact and a fixed contact, the circuit breaker can drive the moving contact to be separated from the fixed contact, in the process, voltage between the moving contact and the fixed contact breaks down air to generate an electric arc, and in order to avoid damage of the electric arc to the circuit breaker, an arc extinguishing device is generally arranged in the circuit breaker.

The mainstream arc extinguishing device in the prior art comprises a plurality of arc extinguishing bars, when the breaker breaks, the induction magnetic field generated by current can enable the electric arc to move towards the arc extinguishing bars under the action of electromagnetic force, and the arc extinguishing bars cut the electric arc and enable the electric arc to be gradually dissipated. However, the arc extinction difficulty of the direct current circuit breaker is greatly different from that of the alternating current circuit breaker, in the alternating current circuit, the arc can be quickly dissipated after the circuit breaker is disconnected due to the natural zero crossing point of the current, but in the direct current circuit, particularly in the direct current circuit with high voltage, the arc is always in a longer time due to the fact that the zero crossing point is not present, and therefore the arc extinction is more difficult. In the prior art, more arc-extinguishing grid plates are arranged for arc-extinguishing effect, so that the size of the circuit breaker is remarkably increased.

Based on this, it is highly desirable for those skilled in the art to develop a breaking unit and a circuit breaker having more arc extinguishing gate sheets, compact structure and not significantly increasing the volume, even not increasing the volume, so as to overcome the drawbacks of the prior art.

Disclosure of utility model

The object of the present disclosure is to solve at least the drawbacks existing in the prior art, the present disclosure proposes a breaking unit comprising a housing; the first static contact is fixed on the shell and provided with a first contact end extending in a first direction; the second fixed contact is fixed on the shell and provided with a second contact end extending in the first direction; a moving contact assembly rotatably mounted to the housing and having first and second moving contacts configured to contact and break the first and second contact ends, respectively, the first and second contact ends being rotationally symmetrical about a rotational axis of the moving contact assembly; a first set of arc suppressing gate sheets disposed on a first side of the moving contact assembly in a first direction, the gate sheets of the first set of arc suppressing gate sheets being arranged at intervals in a second direction perpendicular to the first direction; a second set of arc suppressing gate sheets disposed on a second side of the moving contact assembly opposite the first side in a first direction, the gate sheets of the second set of arc suppressing gate sheets being arranged at intervals in the second direction, one end of the second set of arc suppressing gate sheets being adjacent to the second contact end; a first striking tab having one end adjacent a first end of the first set of arc chute tabs and the other end adjacent a maximum open position of the first moving contact to enable an arc generated when the first moving contact is disconnected from the first stationary contact to be directed toward the first end of the first set of arc chute tabs; and one end of the second arc striking sheet is adjacent to one end of the second group of arc extinguishing grid sheets, which is far away from the second contact end, and the other end of the second arc striking sheet is adjacent to the maximum opening position of the second moving contact, so that an arc generated when the second moving contact is disconnected from the second fixed contact can be guided to one end of the second group of arc extinguishing grid sheets, which is far away from the second contact end.

According to the breaking unit, through reasonable space layout in the shell, more grid sheets are effectively arranged under the condition of not increasing the volume of the breaking unit, and the breaking unit is particularly compatible with the existing breaking unit design or breaker design, so that development cost is greatly reduced.

According to other embodiments of the present disclosure, the two ends of the housing in the first direction have heights that are different in the second direction, and the height of one end of the housing that accommodates the first set of arc extinguishing gate sheets in the second direction is greater than the height of one end of the housing that accommodates the second set of arc extinguishing gate sheets in the second direction.

According to other embodiments of the present disclosure, the number of the gate sheets of the first set of arc extinguishing gate sheets is equal to or greater than the number of the gate sheets of the second set of arc extinguishing gate sheets.

According to other embodiments of the present disclosure, the height of the first set of arc chute sheets in the second direction is greater than or equal to the height of the second set of arc chute sheets in the second direction.

According to other embodiments of the present disclosure, the breaking unit further includes a third striking plate having one end adjacent to a second end of the first group of arc extinguishing gate plates opposite to the first end and the other end adjacent to the first contact end, so as to be able to guide an arc generated when the first moving contact is broken from the first fixed contact to the second end of the first group of arc extinguishing gate plates.

According to other embodiments of the present disclosure, all of the first set of arc suppressing grid plates are aligned with each other in the second direction.

According to other embodiments of the present disclosure, a second end of the first set of arc chute plates opposite the first end is adjacent the first contact end.

According to other embodiments of the present disclosure, the first set of arc chute sheets are arranged obliquely with respect to the first direction and the second direction.

The present disclosure also proposes a circuit breaker comprising a breaking unit according to any one of the preceding embodiments, and an operating mechanism, the operating mechanism being at a distance from the second set of arc chute blades in a first direction that is smaller than the distance from the operating mechanism to the first set of arc chute blades in the first direction.

Drawings

Fig. 1 shows a schematic plan view of a breaking unit according to one embodiment of the present disclosure;

fig. 2 shows a schematic plan view of a breaking unit according to another embodiment of the present disclosure.

Reference numerals

1A shell body, wherein the shell body is provided with a plurality of grooves,

21 First stationary contact, 211 first contact end, 212 connecting terminal, 22 second stationary contact, 221 second contact end, 222 connecting terminal

3 Moving contact assembly, 31 first moving contact, 32 second moving contact,

41 First group of arc extinguishing bars, 411 first end, 412 second end, 42 second group of arc extinguishing bars, 51 first arc striking plates, 52 second arc striking plates, 53 third arc striking plates 6 operating mechanism,

D1 first direction, D2 second direction

Detailed Description

In order to make the objects, aspects and advantages of the technical solutions of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present disclosure. Unless otherwise indicated, terms used herein have the meaning common in the art. Like reference numerals in the drawings denote like parts.

In the description of the present disclosure, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art in the specific context.

For convenience of description, the extending direction of the first contact end of the first stationary contact and the second contact end of the second stationary contact is designated as a first direction in the present disclosure, indicated by an arrow D1 in fig. 1 and 2, and a direction perpendicular to the first direction is designated as a second direction, indicated by an arrow D2 in fig. 1 and 2.

Fig. 1 shows a schematic plan view of a breaking unit according to one embodiment of the present disclosure, and as shown in fig. 1, a segment unit according to the present disclosure includes a housing 1, a first stationary contact 21, a second stationary contact 22, a moving contact assembly 3, a first set of arc extinguishing gate sheets 41, and a second set of arc extinguishing gate sheets 42.

The first and second stationary contacts 21 and 22 are fixed to the housing and have first and second contact ends 211 and 221, respectively, extending in the first direction D1. The first contact end 211 and the second contact end 221 are spaced apart from each other in the first direction D1 and are spaced apart from each other in the second direction D2. In particular, the first contact terminal 211 and the second contact terminal 221 are rotationally symmetrical about a rotation axis of the moving contact assembly 3, which will be described later, to achieve that two moving contacts (which will be described later in detail) on the moving contact assembly 3 are simultaneously contacted with the first contact terminal 211 and the second contact terminal 221, respectively, when the moving contact assembly 3 rotates, to achieve conduction of an electric circuit, and are simultaneously disconnected from the first contact terminal 211 and the second contact terminal 221, respectively, to achieve disconnection of the electric circuit.

The first and second stationary contacts 21 and 22 may further include a connection terminal 212 and a connection terminal 222, respectively, and the connection terminal 212 and the connection terminal 222 may extend out of the housing as shown in fig. 1 for electrically connecting a circuit breaker (not shown) including a breaking unit according to the present disclosure with other parts of the circuit. Furthermore, the first stationary contact 21 and the second stationary contact 22 may be integrally formed as a one-piece member, as shown in fig. 1. Or by a plurality of parts, for example, as shown in fig. 2, the connection terminal 222 of the second stationary contact 22 is connected to the remaining portion of the second stationary contact 22 by a screw.

The moving contact assembly 3 is rotatably mounted to the housing 1, and includes a first moving contact 31 and a second moving contact 32 configured to contact and break with the first contact end 211 and the second contact end 221, respectively, the first moving contact 31 and the second moving contact 32 being also rotationally symmetrical about the rotational axis of the moving contact assembly 3. Therefore, only the rotation of the moving contact assembly 3 is controlled, the first moving contact 31 and the second moving contact 32 can be simultaneously contacted or separated with the first contact end 211 and the second contact end 221 respectively, and the on-off of a circuit is controlled stably.

When the first moving contact 31 and the second moving contact 32 are simultaneously disconnected from the first contact end 211 and the second contact end 221, respectively, the voltage breaks down the air to generate an arc, and in order to avoid damage to the circuit breaker caused by the arc, the arc needs to be extinguished, and thus the first set of arc extinguishing grid plates 41 and the second set of arc extinguishing grid plates 42 are also required to be respectively arranged for the first moving contact 31 and the first fixed contact 21 and the second moving contact 32 and the second fixed contact 22 to realize arc extinguishing.

Specifically, the first group of arc extinguishing gate sheets 41 is disposed on a first side in the first direction D1 of the moving contact assembly 3, and the second group of arc extinguishing gate sheets 42 is disposed on a second side opposite to the first side in the first direction D1 of the moving contact assembly 3. The arc extinguishing bars 41 and the bars of the second group of arc extinguishing bars 42 are all arranged at intervals in the second direction D2.

Since the circuit breaker (not shown) according to the present disclosure is provided with the release (not shown) and the operating mechanism 6 to achieve automatic breaking of the circuit breaker, in order to install the release and the operating mechanism 6, it is necessary to reduce the volume of one end of the case 1 of the breaking unit, thereby leaving more installation space for the release and the operating mechanism 6. As shown in fig. 1, both ends of the case 1 according to the present disclosure in the first direction D1 have different heights in the second direction D2, for example, the height of one end of the case 1 (shown as the left end in fig. 1 and 2) accommodating the first group of arc extinguishing gate sheets 41 in the second direction D2 is greater than the height of one end of the case 2 (shown as the right end in fig. 1 and 2) accommodating the second group of arc extinguishing gate sheets 42 in the second direction D2.

Therefore, the first group of arc-extinguishing bars 41 has a larger installation space than the second group of arc-extinguishing bars 42, and thus, in order to make full use of the space, the height of the first group of arc-extinguishing bars 41 in the second direction D2 is equal to or greater than the height of the second group of arc-extinguishing bars 42 in the second direction D2, so that the arc-extinguishing capability of at least the first group of arc-extinguishing bars 41 is significantly improved, which is sufficient to achieve the required arc-extinguishing performance of the entire circuit breaker.

Additionally or alternatively, the number of the arc-extinguishing bars 41 of the first group may be set to be equal to or greater than the number of the arc-extinguishing bars 42 of the second group, so that the arc-extinguishing capability of at least the arc-extinguishing bars 41 of the first group is significantly improved, sufficient to achieve the required arc-extinguishing performance of the whole circuit breaker.

For example, the number of the first group of arc extinguishing bars 41 may be set in the range of 14 to 20, 15 to 20, 14 to 19, and in particular, 16, 17, 18. The number of arc chute plates of the second group may be set in the range of 10 to 16, 11 to 16, 10 to 15, and in particular, may be 12, 13, 14. These numbers of louvers are significantly increased over the number of arc suppressing louvers generally available on the market or in the prior art, and thus the effect on arc suppressing is also significantly increased.

Further according to the breaking unit of the present disclosure, in order to enable more arc extinguishing gate sheets to be provided, at least part (e.g. the first end 411) of the first group of arc extinguishing gate sheets 41 is provided distant from the moving contact assembly 3 and the first contact end 211, for example, both in the first direction D1 and in the second direction D2, to be housed in a larger installation space as described above (the end of the housing 1 having a greater height of the second direction D2 as described above, shown as the left end in fig. 1 and 2).

In order to introduce the arc generated at the time of breaking into the first ends 411 of the first group of arc extinguishing gate sheets 41 described above, it is also necessary to provide a first striking sheet 51. One end of the first striking plate 51 is adjacent to the first end 411 of the first group of arc extinguishing gate plates 41, and the other end is adjacent to the maximum open position of the first moving contact 31 with respect to the first stationary contact 21, so as to be able to guide an arc generated when the first moving contact 31 is disconnected from the first stationary contact 21 toward the first end 411 of the first group of arc extinguishing gate plates 41.

And for the second ends 412 of the first set of arc extinguishing gate sheets 41 opposite to the first ends 411, as shown in fig. 1, may be disposed away from the moving contact assembly 3 and the first contact end 211 as well, for example, in both the first direction D1 and the second direction D2. In particular, all the bars of the first set of arc-extinguishing bars 41 are aligned with each other in the second direction D2, so as to be entirely housed at the end of the above-mentioned casing having a greater height (shown as left end in fig. 1) in the second direction D2, thereby facilitating an increase in the number of bars and an enhancement of the arc-extinguishing effect.

Similarly, in order to introduce an arc generated at the time of breaking into the second ends 412 of the above-described first group of arc extinguishing gate sheets 41, a third striking sheet 53 may be further provided. One end of the third striking plate 53 is adjacent to the second end 412 of the first group of arc extinguishing gate plates 41, and the other end is adjacent to the first contact end 211 of the first stationary contact 21, so as to be able to guide an arc generated when the first moving contact 31 is disconnected from the first stationary contact 21 toward the second end 412 of the first group of arc extinguishing gate plates 41. Thereby providing a reliable and efficient arc striking scheme for the spacing arrangement of the entire first set of arc chute blades 41 and the moving contact assembly 3, enabling this spacing arrangement to be achieved.

As shown in fig. 2, another embodiment according to the present disclosure is provided, the second ends 412 of the first set of arc extinguishing gate sheets 41 may be disposed close to the first contact ends 211 of the first stationary contacts 21, thereby omitting the third striking sheet 53. In this arrangement, the first group of arc-extinguishing gate sheets 41 may be arranged obliquely with respect to the first direction D1 and the second direction D2, as shown in fig. 2, thereby also achieving an increase in the number of gate sheets, and making the total length of the first group of arc-extinguishing gate sheets 41 longer, thereby further increasing the arc-extinguishing performance.

The breaking unit according to the present disclosure further includes a second group of arc-extinguishing gate sheets 42, as shown in fig. 1 and 2, since the space of the one end of the case having the smaller height in the second direction D2 is limited, in order to increase the number of gate sheets of the second group of arc-extinguishing gate sheets 42, one end of the second group of arc-extinguishing gate sheets 42 needs to be disposed adjacent to the second contact end 221 to reuse the space, so that the structure is more compact.

And the other end of the second set of arc extinguishing gate sheets 42 is far away from the second stationary contact 22, as shown in fig. 1 and 2, whereby a second striking sheet 52 may also be provided, one end of the second striking sheet 52 being adjacent to the end of the second set of arc extinguishing gate sheets 42 that is far away from the second contact end 221, and the other end being adjacent to the maximum open position of the second moving contact 32 with respect to the second contact end 221, so as to be able to direct an arc generated when the second moving contact 32 breaks away from the second stationary contact 22 towards the end of the second set of arc extinguishing gate sheets 42 that is far away from the second contact end 221.

According to the breaking unit, through reasonable space layout in the shell, more grid sheets are effectively arranged under the condition of not increasing the volume of the breaking unit, and the breaking unit is particularly compatible with the existing breaking unit design or breaker design, so that development cost is greatly reduced.

The present disclosure also proposes a circuit breaker comprising a breaking unit as described above, which circuit breaker is further provided with an operating mechanism 6 and a release (not shown), which operating mechanism 6 and release can be arranged outside the above-described housing 1, aligned in the second direction D2 with the smaller end of the housing 1. In other words, the release is at a distance from the second set of arc chute plates 42 in the first direction D1 that is less than the distance from the operating mechanism 6 to the first set of arc chute plates 41 in the first direction D1.

It is to be understood that the above description is intended to be illustrative, and not restrictive. For example, the above-described embodiments (and/or aspects thereof) may be used in combination with each other. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the scope thereof. The functions or capabilities of the various elements or modules described herein are for illustration only and are in no way limiting, but are merely exemplary embodiments. Many other embodiments and modifications within the spirit and scope of the claims will become apparent to those of skill in the art upon reading the foregoing description. The scope of the disclosure should, therefore, be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

In the appended claims, the terms "including" and "in which" are used as the plain-english equivalents of the respective terms "comprising" and "wherein. Furthermore, in the following claims, the terms "first," "second," and "third," etc. are used merely as labels, and are not intended to impose numerical requirements on their objects.

Claims (9)

1. A breaking unit is characterized by comprising

The shell body is provided with a plurality of grooves,

A first stationary contact fixed on the housing and having a first contact end extending in a first direction,

A second stationary contact fixed on the housing and having a second contact end extending in the first direction,

A moving contact assembly rotatably mounted to the housing and having a first moving contact and a second moving contact configured to contact and break the first contact end and the second contact end, respectively, the first contact end and the second contact end being rotationally symmetrical about a rotational axis of the moving contact assembly,

A first set of arc extinguishing grid plates arranged at a first side of a first direction of the movable contact assembly, wherein the grid plates in the first set of arc extinguishing grid plates are arranged at intervals in a second direction perpendicular to the first direction,

A second set of arc suppressing gate sheets disposed on a second side of the moving contact assembly opposite to the first side in the first direction, the gate sheets of the second set of arc suppressing gate sheets being arranged at intervals in the second direction, one end of the second set of arc suppressing gate sheets being adjacent to the second contact end,

A first striking plate, one end of the first striking plate is adjacent to a first end of the first group of arc extinguishing grid plates, and the other end is adjacent to a maximum opening position of the first moving contact, so that an arc generated when the first moving contact is disconnected from the first fixed contact can be guided to the first ends of the first group of arc extinguishing grid plates,

And one end of the second arc striking sheet is adjacent to one end of the second group of arc extinguishing grid sheets, which is far away from the second contact end, and the other end of the second arc striking sheet is adjacent to the maximum opening position of the second moving contact, so that an arc generated when the second moving contact is disconnected from the second fixed contact can be guided to one end of the second group of arc extinguishing grid sheets, which is far away from the second contact end.

2. A breaking unit according to claim 1, characterized in that,

The two ends of the shell in the first direction are provided with heights which are different in the second direction, and the height of one end of the shell, which is used for accommodating the first group of arc-extinguishing grid sheets, in the second direction is larger than the height of one end of the shell, which is used for accommodating the second group of arc-extinguishing grid sheets, in the second direction.

3. Breaking unit according to claim 2, characterized in that,

The number of the grid sheets of the first group of arc-extinguishing grid sheets is larger than or equal to that of the grid sheets of the second group of arc-extinguishing grid sheets.

4. Breaking unit according to claim 2, characterized in that,

The height of the first group of arc-extinguishing grid plates in the second direction is larger than or equal to the height of the second group of arc-extinguishing grid plates in the second direction.

5. Breaking unit according to any one of claims 1-4, characterized in that,

The breaking unit further comprises a third striking plate, one end of the third striking plate is adjacent to a second end, opposite to the first end, of the first group of arc extinguishing grid plates, and the other end of the third striking plate is adjacent to the first contact end, so that an electric arc generated when the first moving contact and the first fixed contact are broken can be led to the second end of the first group of arc extinguishing grid plates.

6. A breaking unit according to claim 5, characterized in that,

All of the first set of arc suppressing grid plates are aligned with each other in the second direction.

7. Breaking unit according to any one of claims 1-4, characterized in that,

A second end of the first set of arc chute blades opposite the first end is adjacent the first contact end.

8. A breaking unit according to claim 7, wherein,

The first set of arc chute plates are arranged obliquely with respect to the first direction and the second direction.

9. A circuit breaker is characterized in that,

A breaking unit comprising any one of the preceding claims.