Breaking unit and electrical device

Abstract

The utility model provides a breaking unit comprising a static contact which is provided with a section extending along a first direction, and the section is provided with a contact surface facing a second direction perpendicular to the first direction; the moving contact is arranged on the first side of the static contact along the second direction and is configured to move relative to the static contact so as to realize contact and separation with the contact surface of the static contact; the plurality of arc extinguishing grid plates are arranged on the first side of the static contact at intervals along a first direction, and the plurality of arc extinguishing grid plates are parallel to each other and are transverse to the first direction; the arc extinguishing cover comprises a first section and a second section, the first section is arranged on one side, far away from the static contact in the second direction, of the arc extinguishing grid piece, the second section is arranged on one side, far away from the moving contact in the first direction, of the arc extinguishing grid piece, and the first section and the second section are connected to partially surround the arc extinguishing grid piece; a gap is arranged between each arc extinguishing chamber and the corresponding arc extinguishing grid sheet. The arc extinguishing chamber comprises an outlet arranged on the second section.

Description

Technical Field

[0001] The present disclosure relates to the electrical field, and in particular to a disconnecting unit and an electrical device comprising the disconnecting unit. Background Art

[0002] In the arc extinguishing chamber, when an arc occurs, high-temperature and high-pressure gas will be generated. The arc extinguishing chamber needs to have a gas port to discharge the gas to reduce the gas pressure in the arc extinguishing chamber. When the current is large, an arc extinguishing grid is usually set in the arc extinguishing chamber to increase the arc voltage by cutting the arc to reduce the arc current so that the arc can be extinguished as soon as possible. Therefore, the gas channel in the arc extinguishing chamber can be designed so that the arc can enter the arc extinguishing chamber as completely as possible by guiding the gas. However, the design of the arc extinguishing chamber should try to avoid the arc from being ejected directly to the outside of the electrical device, otherwise it will cause a short circuit or personal injury.

[0003] The arc extinguishing chamber of a traditional electrical device usually consists of two parts. One part is the arc extinguishing hood and the other part is the cover. The airflow flows from the arc extinguishing hood to the cover first, and then flows out of the product. When an arc occurs, especially when there is a short-circuit current, high-pressure gas will be instantly generated inside the arc extinguishing chamber. This will instantly impact the arc extinguishing chamber and the cover. If the connection between the cover and the arc extinguishing chamber is not reliable, the cover will be lifted by the airflow. In order to strengthen the connection between the cover and the arc extinguishing hood, a reliable connection such as screws is required. This will make the structure more complicated, and the cover has the function of blocking gas. Once the cover falls off, the entire product will fail.

[0004] Therefore, a high-strength and high-efficiency breaking unit structure is required. Utility Model Content

[0005] The purpose of the present disclosure is to at least solve the shortcomings existing in the prior art. The present disclosure proposes a breaking unit, characterized in that it includes a stationary contact having a section extending along a first direction, the section being provided with a contact surface facing a second direction perpendicular to the first direction; a moving contact, arranged on a first side of the stationary contact along the second direction, and configured to move relative to the stationary contact to achieve contact and separation with the contact surface of the stationary contact; a plurality of arc-extinguishing grids, arranged on the first side of the stationary contact at intervals along the first direction, each of the plurality of arc-extinguishing grids being parallel to each other and transverse to the first direction; an arc-extinguishing hood, the arc-extinguishing hood comprising a first section arranged on a side of the arc-extinguishing grid away from the stationary contact along the second direction and a second section arranged on a side of the arc-extinguishing grid away from the moving contact along the first direction, the first section and the second section being connected to partially surround the arc-extinguishing grid, and gaps are respectively provided between the first section and the arc-extinguishing grid, and the arc-extinguishing hood comprises an outlet arranged on the second section.

[0006] According to the disconnecting unit disclosed in the present invention, the gas movement path is lengthened, so that the gas can be fully cooled and discharged directly from the arc extinguishing chamber after the arc is extinguished, without causing short circuit or personal injury. Compared with the disconnecting unit including a face cover in the prior art, the face cover and the arc extinguishing cover do not need to be connected by screws, but only need to be connected by snaps. The face cover has only a decorative function. The product can still guarantee its function when it is missing. The connection between parts is simplified, and the reliability of the product is increased. In addition, the face cover does not need to be made of the same material as the arc extinguishing cover, or does not need to have the same high insulation and high temperature resistance as the arc extinguishing cover. Since the face cover does not need to block the gas, the product is not easy to fail even when a large current (such as a short-circuit current) is impacted, thereby improving the reliability of the product.

[0007] For example, according to some solutions of the present disclosure, the arc extinguishing hood further comprises a third section arranged on a side of the moving contact away from the static contact along the second direction and arranged on a side of the arc extinguishing grid close to the moving contact along the first direction, a drainage slope is arranged between the first section and the third section, and the drainage slope is inclined and / or curved relative to the second direction and the first direction,

[0008] For example, according to some embodiments of the present disclosure, the third section, the drainage slope, the first section, and the second section are integrally formed.

[0009] For example, according to some aspects of the present disclosure, the plurality of arc extinguishing grids are spaced and aligned with each other along a first direction, and each of the plurality of arc extinguishing grids is perpendicular to the first direction.

[0010] For example, according to some embodiments of the present disclosure, the breaking unit further includes an arc-striking piece having a first arc-striking section arranged between the arc-extinguishing grid and the stationary contact, and a second arc-striking section extending between the arc-extinguishing grid and the second section of the arc-extinguishing cover.

[0011] For example, according to some solutions of the present disclosure, a first end portion of the stationary contact away from the moving contact along a first direction extends out of the arc-extinguishing cover to serve as a connecting terminal.

[0012] For example, according to some solutions of the present disclosure, the breaking unit further includes a surface cover, which is disposed outside the arc extinguishing cover, and the surface cover does not block the outlet.

[0013] The present disclosure also provides an electrical device, comprising any one of the above-mentioned disconnecting units.

[0014] For example, according to some aspects of the present disclosure, the electrical device further includes a junction box, wherein the junction box includes a through hole aligned with the outlet.

[0015] For example, according to some aspects of the present disclosure, a gap is provided between the junction box and the arc extinguishing hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective schematic diagram showing a portion of an electrical device including a disconnecting unit according to an embodiment of the present disclosure;

[0017] Figure 2 Show Figure 1 Schematic diagram of the flow of gases within parts of an electrical device.

[0018] Reference numerals

[0019] 1 stationary contact, 11 first end, 12 contact surface

[0020] 2 moving contacts,

[0021] 3 arc quenching grids,

[0022] 4 arc extinguishing cover, 41 first section, 42 second section, 43 third section, 44 drainage slope, 45 outlet 5 arc striking piece, 51 first arc striking section, 52 second arc striking section,

[0023] 6 side covers,

[0024] 7 Junction Box,

[0025] D1 first direction, D2 second direction DETAILED DESCRIPTION

[0026] In order to make the purpose, scheme and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0027] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0028] For the convenience of explanation, in the present disclosure, the direction of the contact surface of the stationary contact for contacting the moving contact is designated as the second direction D2, and the first direction D1 is designated to be perpendicular to the second direction D2.

[0029] The breaking unit according to the present disclosure includes a stationary contact 1 and a moving contact 2. The stationary contact 1 can be, for example, Figure 1The straight shape shown may also have a curved shape. In addition, the stationary contact 1 has a section extending along the first direction D1, on which a contact surface 12 is provided. The stationary contact 1 may also include a first end 11 away from the moving contact along the first direction D1, and the first end 11 extends out of the arc extinguishing cover (described in detail later) to serve as a terminal.

[0030] The movable contact 2 may be arranged on a first side of the stationary contact 1 along the second direction D1. The movable contact 2 may be configured to move linearly in the second direction D2 relative to the stationary contact 1 to achieve contact and separation with the contact surface 12 of the stationary contact 1. In addition, the movable contact 2 may also be configured to pivotally move, and may also achieve contact and separation with the contact surface 12 of the stationary contact 1.

[0031] The breaking unit according to the present disclosure may further include a plurality of arc-extinguishing grids 3, which are arranged at intervals from each other along the first direction D1 on the first side of the stationary contact 1 as described above, that is, on the same side of the stationary contact 1 in the second direction D2 as the moving contact 2. Each of the plurality of arc-extinguishing grids 3 is parallel to each other and transverse to the first direction D1. In particular, the plurality of arc-extinguishing grids 3 are arranged at intervals aligned with each other along the first direction, and each arc-extinguishing grid 3 is perpendicular to the first direction D1. This arrangement is compact, saves space, and is conducive to miniaturization of the breaking unit.

[0032] The breaking unit according to the present disclosure may further include an arc extinguishing hood 4, which may include a first section 41, a second section 42 and a third section 43, wherein the first section 41 is arranged on a side of the plurality of arc extinguishing grids 3 away from the static contact 1 along the second direction D2, and in particular extends along the first direction D1; the second section 42 is arranged on a side of the plurality of arc extinguishing grids 3 away from the moving contact 2 along the first direction D1, and in particular extends along the second direction D2; the third section 43 is arranged on a side of the moving contact 2 away from the static contact 1 along the second direction D2 and on a side of the arc extinguishing grid 3 close to the moving contact 2 along the first direction D1, and in particular extends along the second direction D2.

[0033] In addition, the arc extinguishing hood 4 may further include a drainage slope 44, which is disposed between the first section 41 and the third section 43. For example, the drainage slope 44 may be inclined and / or curved relative to the first direction D1 and the second direction D2, such as Figure 1As shown, the diversion slope is positioned to be opposite to the arc extinguishing grid 3 in the first direction D1 and opposite to the contact surface 12 of the stationary contact 1 in the second direction D2, so that when the breaking unit performs a breaking operation, that is, when the moving contact 2 is separated from the stationary contact 1, the generated gas moves along the second direction D2 in the gap between the arc extinguishing grid 3 and the third section 43 until it collides with the diversion slope 44, and is thereby redirected and diverted to move in the direction toward the arc extinguishing grid 3 along the first direction D1, thereby facilitating more arcs to be directed to the arc extinguishing grid, facilitating arc extinguishing, and increasing the arc extinguishing capacity of the breaking unit.

[0034] The first section 41, the second section 42 and the third section 43 may be provided with gaps between the arc extinguishing grid 3 to form a gas channel for gas circulation. The third section 43, the drainage slope 44, the first section 41 and the second section 42 are connected in sequence to at least partially surround the above-mentioned plurality of arc extinguishing grids 3 to form an arc extinguishing chamber, block the leakage of gas, and allow the gas to flow along the planned gas channel. In particular, the third section 43, the drainage slope 44, the first section 41 and the second section 42 may be an integrally formed component, that is, the arc extinguishing cover 4 is integrally formed, thereby further increasing the air tightness.

[0035] In addition, the arc extinguishing hood 4 further includes an outlet 45 arranged on the second section, in particular, the outlet is close to the static contact 1, whereby the gas generated during the breaking operation of the breaking unit flows out of the breaking unit from the outlet 45 through the gap along the third section 43, the drainage slope 44, the first section 41 and the second section 42, and the gas flow direction is as follows: Figure 2 As shown by the thicker arrow in the figure, the gas movement path is lengthened, so that the gas can be fully cooled and discharged directly from the arc extinguishing chamber after the arc is extinguished, without causing short circuit or personal injury.

[0036] In addition, the breaking unit may further include an arc-striking piece 5, which may have a first arc-striking section 51 arranged between the arc-extinguishing grid 3 and the stationary contact 1, and a second arc-striking section 52 extending between the arc-extinguishing grid 3 and the second section 42 of the arc-extinguishing hood 4, for example Figure 1 As shown, the arc-striking piece 5 is roughly J-shaped. The arrangement of the arc-striking piece 5 can further facilitate the arc to be directed to the arc-extinguishing grid, thereby increasing the arc-extinguishing capability of the breaking unit.

[0037] The breaking unit according to the present disclosure further includes a cover 6, which is arranged outside the arc extinguishing hood 5, for example, to play a protective and decorative role. Moreover, the cover 6 does not block the outlet 45, and the cover 6 does not participate in the arc extinguishing process, so that the gas generated during the breaking can be directly discharged from the outlet 45 after passing through the gas channel arranged in the arc extinguishing chamber without being blocked, and the cover does not need to be specially fastened to the arc extinguishing hood 5, which reduces the difficulty of assembly. Moreover, since the cover 6 does not need to play a role in blocking gas, the performance requirements of the cover 6 can be lower than those of the arc extinguishing hood, that is, it does not need high insulation or high temperature resistance.

[0038] In addition, the disconnecting unit according to the present disclosure may also include two (not shown) moving contacts and a stationary contact, thereby including two arc extinguishing chambers, and the structures of the two arc extinguishing chambers are symmetrically arranged, for example, centrally symmetrical or mirror-symmetrical, depending on the arrangement of the moving contacts and the stationary contacts.

[0039] The present disclosure also provides an electrical device, comprising one or more of the above-mentioned disconnecting units. The electrical device may be, for example, a contactor or a circuit breaker. The electrical device also includes a junction box 7, which includes a through hole aligned with the above-mentioned outlet 45, thereby not hindering the outflow of gas in the arc extinguishing chamber.

[0040] Preferably, a gap is provided between the housing of the junction box 7 and the arc extinguishing hood 4 for gas to flow out, so that even if the outlet 45 is blocked by the wiring, the gas can still flow out of the electrical device through the gap. Figure 2 As shown by the thinner arrows in the figure, the safety of the electrical installation is further increased.

[0041] It should be understood that the above description is intended to illustrate rather than limit. For example, the above embodiments (and / or aspects thereof) can be used in combination with each other. In addition, without departing from the scope of the present disclosure, many modifications can be made to adapt specific situations or materials to the teachings of the present disclosure. The functions or performances of the various elements or modules described herein are only for illustration and are by no means restrictive, but are merely exemplary embodiments. After reading the above description, many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art. Therefore, the scope of the present disclosure should be determined with reference to the full scope of the equivalents given by the attached claims and these claims.

[0042] In the following claims, the terms “including” and “in which” are used as the plain-English equivalents of the respective terms “comprising” and “wherein.” Moreover, 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

1. A breaking unit, It is characterized in that include The stationary contact has a section extending along a first direction, and the section is provided with a contact surface facing a second direction perpendicular to the first direction, a moving contact, arranged on a first side of the stationary contact along the second direction, and configured to move relative to the stationary contact to achieve contact and separation with a contact surface of the stationary contact, A plurality of arc-extinguishing grids are arranged at a first side of the stationary contact in a spaced relationship along a first direction, wherein each of the plurality of arc-extinguishing grids is parallel to each other and transverse to the first direction, An arc extinguishing hood, the arc extinguishing hood comprising a first section arranged on a side of the arc extinguishing grid away from the static contact along the second direction and a second section arranged on a side of the arc extinguishing grid away from the moving contact along the first direction, the first section and the second section are connected to partially surround the arc extinguishing grid, and gaps are respectively arranged between the first section and the arc extinguishing grid, and the arc extinguishing hood comprises an outlet arranged on the second section.

2. The breaking unit according to claim 1, It is characterized in that The arc extinguishing cover also includes a third section arranged on a side of the moving contact away from the static contact along the second direction and on a side of the arc extinguishing grid close to the moving contact along the first direction, and a drainage slope is arranged between the first section and the third section, and the drainage slope is inclined and / or curved relative to the second direction and the first direction.

3. The breaking unit according to claim 2, It is characterized in that The third section, the drainage slope, the first section and the second section are integrally formed.

4. The breaking unit according to claim 1, It is characterized in that The plurality of arc extinguishing grids are spaced and aligned with each other along a first direction, and each of the plurality of arc extinguishing grids is perpendicular to the first direction.

5. The breaking unit according to claim 4, It is characterized in that The breaking unit further comprises an arc striking piece having a first arc striking section arranged between the arc extinguishing grid and the stationary contact, and a second arc striking section extending between the arc extinguishing grid and the second section of the arc extinguishing hood.

6. The breaking unit according to claim 1, It is characterized in that A first end portion of the stationary contact away from the moving contact along a first direction extends out of the arc-extinguishing cover to serve as a connecting terminal.

7. The breaking unit according to claim 1, It is characterized in that It also includes a surface cover, which is arranged outside the arc extinguishing cover and does not block the outlet.

8. An electrical device, It is characterized in that include A breaking unit according to any one of claims 1 to 7.

9. The electrical device according to claim 8, It is characterized in that The electrical device also includes a junction box including a through hole aligned with the outlet.

10. The electrical device according to claim 9, It is characterized in that A gap is provided between the junction box and the arc extinguishing cover.

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