CN105990049A - Disconnecting switch and switching device - Google Patents

Abstract

Disclosed are disconnectors and switchgear thereof. In the disconnector, the static contact is fixed, the movable contact can move along a straight line relative to the static contact, and one end of the movable contact has a first contact portion. The arc contact is passed through the static contact, and can move between the closed position and the separated position relative to the static contact along a straight line, and has a magnetic second contact part at the end close to the movable contact, which is mutually connected with the first contact part. Magnetically attracts and is accessible. The reset elastic part acts on the arc contact, and when the moving contact moves away from the static contact, the first contact part drives the second contact part to move from the closed position to the separated position through magnetic force, and the reset elastic part elastically deforms and moves toward the arc contact. The head provides a restoring force, and in the separated position, the restoring force is greater than the magnetic force to separate the first contact part from the second contact part and drive the arc contact to move away from the movable contact. The above isolating switch can reduce the damage of the arc to the isolating switch. The invention also relates to a switchgear employing the aforementioned disconnector.

Description

Isolating switch and its switchgear

technical field

The present invention relates to switchgear, and more particularly to isolating switches. The invention also relates to a switchgear, in particular a gas-insulated metal-enclosed switchgear, using the aforementioned disconnector.

Background technique

The isolating switch includes a static contact and a moving contact that can be in contact with or separated from the static contact, and the contact or separation of the moving contact and the static contact can control the closing and opening of the isolating switch. When the moving contact is separated from the static contact, an arc will be generated, and the arc may not only burn out the moving and static contacts, but may also burn out other components inside the disconnector.

Contents of the invention

The purpose of the present invention is to provide an isolating switch, which can reduce the duration of the arc when the contacts are separated, facilitate the dispersion of the arc energy, and make it easier to separate the moving and static contacts. This kind of isolating switch is easier to do the disconnection operation, which can reduce the damage of the arc to the isolating switch.

The object of the present invention is also to provide a switchgear comprising the aforementioned disconnector.

The isolating switch provided by the invention includes a static contact, a moving contact, an arc contact and a reset elastic member. The static contact is fixed on the isolating switch. The moving contact can move in a straight line relative to the stationary contact, and has a magnetic first contact portion at an end close to the stationary contact. The arc contact is passed through the static contact, and can move between a closing position and a separation position relative to the static contact along a straight line. The arc contact has a magnetic second contact portion at an end close to the moving contact, which is magnetically attracted to and can contact with the first contact portion. When the movable contact moves away from the fixed contact, the first contact portion drives the second contact portion to move from the closed position to the separated position by magnetic force, and the elastic reset member elastically deforms And provide a restoring force to the arcing contact. In the separated position, the restoring force is greater than the magnetic force to separate the first contact portion from the second contact portion and drive the arc contact to move away from the movable contact.

After the first contact part and the second contact part are separated, the elastic restoring force will quickly pull the arc contact away from the moving contact, thereby shortening the duration of the arc between the second contact part and the first contact part. The isolating switch with the above structure It can avoid burning moving contacts, arcing contacts, static contacts and other parts inside the isolating switch.

According to one aspect of the isolating switch of the present invention, the inner surface of the fixed contact has an annular protrusion in the circumferential direction. The arcing contact has a connecting portion at the other end remote from the moving contact. The return elastic member includes a first spring, one end of which is connected to the connecting portion, and the other end is connected to the annular protrusion. The above structure can make the contact operation more stable. The annular protrusion facilitates the installation of the reset elastic member.

According to another aspect of the isolating switch of the present invention, the return elastic member further includes a second spring, one end of which is connected to the second contact portion of the arc contact, and the other end is connected to the annular protrusion. The above structure can make the contact operation more stable. The second spring is beneficial to increase the restoring force generated by the restoring elastic member.

According to yet another aspect of the isolating switch of the present invention, the first contact portion has a first inner cavity, and a first magnetic block is disposed in the first inner cavity. The second contact portion has a second inner cavity, and a second magnetic block is arranged in the second inner cavity. The above design can protect the magnetic block. In addition, since the electrical conductivity between the magnetic blocks is not strong, direct contact of the magnetic blocks in the closed position can avoid affecting the flow of current.

According to still another aspect of the isolating switch of the present invention, the first magnetic block is located at the center of the moving contact, and the second magnetic block is located at the center of the arcing contact. This design makes the magnetic induction line between the first contact part and the second contact part extend along the contact direction, and the arc between the moving contact and the arcing contact rotates helically along the magnetic induction line, thus lengthening the arc path so that the arc is more stable. Easily lose energy.

According to yet another aspect of the isolating switch of the present invention, the axis of the moving contact coincides with the axis of the arcing contact, and the centers of the first magnetic block and the second magnetic block are located on the axis.

In the following, preferred embodiments will be described in a clear and understandable manner with reference to the accompanying drawings, and the above-mentioned characteristics, technical features, advantages and implementation methods of the isolating switch will be further described.

Description of drawings

The following drawings only illustrate and explain the present invention schematically, and do not limit the scope of the present invention.

FIG. 1 is a schematic diagram of an exploded structure for illustrating an exemplary embodiment of an isolating switch.

2 to 4 are schematic diagrams illustrating different operating states of the isolating switch.

Label description

10 static contacts

12 ring raised

20 moving contacts

22 First contact part

222 First magnetic block

30 arcing contacts

32 Second contact part

322 Second magnetic block

34 Connecting part

40 Resetting elastic piece

42 Second spring

44 First spring.

detailed description

In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings, in which the same reference numerals represent components with the same or similar structures but the same functions.

In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.

In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, in order to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked.

Herein, "a" not only means "only one", but also means "more than one". Herein, "upper", "lower", "front", "rear", "left", "right", etc. are only used to indicate the positional relationship between related parts, not to limit their absolute positions.

In this document, "first", "second" and so on are only used to distinguish each other, but not to indicate their importance, order and the like.

FIG. 1 is a schematic diagram of an exploded structure for illustrating an exemplary embodiment of an isolating switch. 2 to 4 are schematic diagrams illustrating different operating states of the isolating switch. For ease of description, only the structure of the contact part of the disconnector is shown in the figure.

As shown in FIG. 1 , the isolating switch includes a static contact 10 , a moving contact 20 , an arc contact 30 and a reset elastic member 40 . Wherein, the static contact 10 is fixed on the isolating switch, for example, it can be welded in the housing of the isolating switch, or it can be fixed on the isolating switch by other conventional technical means for those skilled in the art, and will not be repeated here.

The moving contact 20 can move along a straight line relative to the static contact 10 in the opposite direction as shown by the arrows in Figures 2 to 4, so as to contact the static contact 10 to realize the closing of the isolating switch, or as shown by the arrows in Figures 2 to 4 The direction of moving away from the static contact 10 in a straight line to separate from the static contact 10 realizes the disconnection of the isolating switch. Wherein, the movable contact 20 has a magnetic first contact portion 22 at an end close to the stationary contact 10 .

As shown in Figures 2 to 4, the arcing contact 30 passes through the static contact 10 and is in conductive contact with the static contact 10. For example, the inner surface of the static contact 10 facing the arcing contact 30 can be provided to electrically connect the arcing contact 30. contacts, or use other technical means commonly used by those skilled in the art to electrically connect the static contact 10 to the arc contact 30 , which will not be repeated here. The arcing contact 30 can move along a straight line relative to the stationary contact 10 between a closed position and a disengaged position in the direction indicated by the arrow in the figure or in the opposite direction. When the arcing contact 30 is in the closed position, the moving contact 20 can conduct conductive contact with the static contact 10 through the arcing contact 30 , or the moving contact 20 can directly contact the static contact 10 to realize the closing of the isolating switch. During the movement of the arc contact 30 from the closing position to the separation position, an arc will first be generated between the arc contact 30 and the moving contact 20 and then separated, thereby realizing the disconnection of the isolating switch. The arcing contact 30 has a magnetic second contact part 32 at one end close to the moving contact 20, which is magnetically attracted to and contactable with the first contact part 22, so as to realize the electrical connection between the arcing contact 30 and the moving contact 20. connect.

The return elastic member 40 can act on the arc contact 30 . In the preferred embodiment shown in FIGS. 2 to 4 , the restoring elastic member 40 includes a first spring 44 and a second spring 42 . There is an annular protrusion 12 in the circumferential direction of the inner surface of the static contact 10 . The arc contact 30 has a connecting portion 34 at the other end away from the moving contact 20 except the end provided with the second contact portion 32, one end of the first spring 44 is connected to the connecting portion 34, and the other end of the first spring 44 Connected to the annular protrusion 12. One end of the second spring 42 is connected to the second contact portion 32 of the arc contact 30 , and the other end of the second spring 42 is connected to the annular protrusion 12 .

As shown in Figure 2, the arc contact 30 is in the closed position at this moment, the first contact portion 22 of the movable contact 20 contacts the second contact portion 32 of the arc contact 30, and the first contact portion 22 and the second contact portion 32 At this time, the second spring 42 is in a compressed state, and the first spring 44 is in a stretched state, so as to provide elastic force to the arc contact 30, so that the contact between the second contact portion 32 and the first contact portion 22 is closer . After the disconnection operation is performed, the moving contact 20 will be pulled to the left along a straight line in the direction indicated by the arrow in Figure 2, so that the moving contact 20 will move away from the static contact 10. The second contact portion 32 is driven by magnetic force to pull the arc contact 30 to move from the closed position to the separated position. Since the arc contact 30 moves to the left as a whole, the first spring 44 will be in a compressed state, and the second spring 42 will be in a stretched state. Both the first spring 44 and the second spring 42 will provide the arc contact 30 with a rightward The restoring force, and as the arcing contact 30 moves to the left increases, the restoring force also increases until the arcing contact 30 moves to the separation position. At this time, as shown in FIG. 3 , the restoring force is greater than the magnetic force between the first contact portion 22 and the second contact portion 32 , so that the first contact portion 22 and the second contact portion 32 are separated. Simultaneously, the moving contact 20 is separated from the arcing contact 30 and the static contact 10 , and an arc is generated between the moving contact 20 and the arcing contact 30 . Since there is also a magnetic force between the first contact part 22 and the second contact part 32, and the magnetic induction line of the magnetic force extends along the contact direction, the arc between the moving contact 20 and the arcing contact 30 will move along the magnetic induction line. The spiral rotation lengthens the arc path, makes it easier for the arc to disperse and dissipate energy, and makes it easier to separate the moving contact 20 from the arc contact 30 . In addition, after the first contact portion 22 and the second contact portion 32 are separated, the restoring force provided by the first spring 44 and the second spring 42 will quickly pull the arc contact 30 to move to the right in the opposite direction as shown by the arrow in the figure. , so that the arc contact 30 leaves the moving contact 20 quickly, shortens the duration of the arc between the second contact part 32 and the first contact part 22, and can avoid burning the moving contact, arc contact, static contact and isolating switch other internal components.

Although the return elastic member 40 in FIGS. 2 to 4 includes a first spring 44 and a second spring 42 to improve the stability of the contact operation. However, according to different design requirements, the return elastic member 40 can also adopt other methods or structures, for example, the return elastic member 40 can also be designed only with the first spring 44 or only with the second spring 42 .

In the embodiment shown in FIGS. 2 to 4 , the first contact portion 22 also has a first inner cavity, and a first magnetic block 222 is disposed in the first inner cavity. The second contact portion 32 also has a second inner cavity, and a second magnetic block 322 is disposed in the second inner cavity. The first magnetic block 222 and the second magnetic block 322 may be, for example, magnets. The above design can prevent the first magnetic block 222 and the second magnetic block 322 from being damaged due to direct collision due to excessive operating force, and can avoid affecting current flow due to weak electrical conductivity between the magnetic blocks at the closed position. The first magnetic block 222 is located at the center of the movable contact 20 , and the second magnetic block 322 is located at the center of the arc contact 30 . The axis of the moving contact 20 coincides with the axis of the arcing contact 30, and the centers of the first magnetic block 222 and the second magnetic block 322 are located on the axis. The contact portion between the first contact portion 22 and the second contact portion 32 is preferably made of copper-tungsten alloy to protect the magnetic block and improve the ability to resist ablation.

It should be understood that although this description is described according to various embodiments, not each embodiment only includes an independent technical solution, and this description of the description is only for clarity, and those skilled in the art should take the description as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent implementation or implementation that does not depart from the spirit of the present invention Changes, such as combination, division or repetition of features, should be included in the protection scope of the present invention.

Claims (7)

1. disconnecting switch, including:

One static contact (10), it is fixedly arranged on described disconnecting switch；

One moving contact (20), it can be linearly mobile relative to described static contact (10), and near described static contact (10) One end there is first contact site (22) of a magnetic；

One arc contact (30), it is arranged in described static contact (10), and can be linearly relative to described static contact (10) Move between make position and separation point position, and there is in the one end near described moving contact (20) the second contact of a magnetic Portion (32), it attracts with described first contact site (22) mutually magnetic and can contact；With

One return springs (40), it is when described moving contact (20) deviates from described static contact (10) movement, and described first Contact site (22) drives described second contact site (32) to move to described separation point position from described make position by magnetic force, institute State return springs (40) elastic deformation occurs and provides restoring force to described arc contact (30), and in described separation point position, Described first contact site (22) and described second contact site (32) are separated by described restoring force more than described magnetic force, and drive It is mobile that described arc contact (30) deviates from described moving contact (20).

2. disconnecting switch as claimed in claim 1, the circumference of the inner surface of wherein said static contact (10) has a convex annular Rise (12)；Described arc contact (30) has a connecting portion (34) at the other end away from described moving contact (20)；Institute Stating return springs (40) and include first spring (44), its one end is connected to described connecting portion (34), and the other end connects In described annular protrusion (12).

3. disconnecting switch as claimed in claim 1 or 2, wherein said return springs includes second spring (42), one End is connected to described second contact site (32) of described arc contact (30), and the other end is connected to described annular protrusion (12).

4. disconnecting switch as claimed in claim 3, wherein said first contact site (22) has first inner chamber, and described first Inner chamber is provided with first magnetic block (222)；Described second contact site (32) has second inner chamber, and described second Inner chamber is provided with second magnetic block (322).

5. disconnecting switch as claimed in claim 4, wherein said first magnetic block (222) is positioned in described moving contact (20) Centre, and described second magnetic block (322) is positioned at the central authorities of described arc contact (30).

6. disconnecting switch as claimed in claim 5, the axis of wherein said moving contact (20) and the axle of described arc contact (30) Line overlaps, and described first magnetic block (222) and described second magnetic block (322) center are respectively positioned on described axis.

7. switchgear, including a disconnecting switch as described in claim 1 to 6.