CN117637363A - Static contact and electric switch - Google Patents

Abstract

The invention discloses a static contact, which comprises a contact end, a wiring end and a conductor, wherein the contact end is used for contacting with a moving contact of an electric switch to conduct electricity, the wiring end is used for being electrically connected with the outside, the conductor is connected between the contact end and the wiring end, a passage used for passing through an arc is arranged on the conductor, and the electric switch comprises the static contact.

Description

Static contact and electric switch

Technical Field

The invention relates to the field of low-voltage electrical appliances, in particular to a fixed contact and an electric switch comprising the fixed contact.

Background

With the development of photovoltaic technology, the rated working voltage of the plastic shell switch which is needed at present is raised to AC1000V and DC1500V, the high voltage requires the arcing distance of the plastic shell switch to be as short as possible, even zero arcing, so as to ensure the safety and reliability of the switch in the use process, secondary arcing faults can not be caused to a box body and a cabinet body, two technical means for realizing zero arcing are provided, firstly, zero arcing covers are adopted to block arcing particles, the length and wiring difficulty of the switch are inevitably increased, and the use range of the switch is limited; the other is that the arc path length of the lengthened arc in the shell is often influenced by a switch structure in practical application, the fixed contact of the plastic shell switch often extends from the wiring end side along the length direction of the insulating shell, and the other end of the fixed contact is contacted with or disconnected from the moving contact, so that the end point of the arc path arranged in front of the arc extinguishing chamber can only reach the upper part of the fixed contact, or the arc path is enabled to bypass the fixed contact and then extend to the lower part of the switch continuously by increasing the width of the switch.

Therefore, it is desirable to provide a technical solution that can lengthen the arc path without increasing the volume of the molded case.

Disclosure of Invention

Based on the background, in order to solve at least one of the problems, the invention provides a static contact and an electric switch comprising the static contact, wherein a channel penetrating through an electric arc is arranged on the static contact, so that the electric arc channel can continue to extend towards the rear part of a base and the switch after being communicated with the channel on the static contact when the electric arc channel extends from an arc extinguishing chamber to the static contact, thereby increasing the length of the electric arc channel and reasonably arranging the position of an air outlet, and overcoming the problems.

In one aspect, the present application provides a stationary contact comprising a contact end for contacting a moving contact of an electrical switch, a terminal for electrical connection with the outside, and an electrical conductor connected between the contact end and the terminal, the electrical conductor being provided with a passage for passing an arc.

In a preferred embodiment, the channel is a notch formed on the edge of the conductor or/and an opening formed on the conductor.

In a preferred embodiment, the openings may be rectangular, circular, diamond-shaped, triangular, or other irregular shapes in shape.

In a preferred embodiment, an annular boss is arranged around the opening on the fixed contact, and the annular boss and the contact end are located on two opposite end surfaces of the fixed contact.

In the embodiment, the annular boss is arranged around the opening on the fixed contact, so that the sectional area of the copper bar of the fixed contact can be increased, and the current carrying capacity of current can be increased; meanwhile, the annular boss also plays a role in installation and positioning, so that the static contact is convenient to install in the base accurately.

In a preferred embodiment, the contact ends may be conductive alloy contacts or collet structures.

In a preferred embodiment, the cross-sectional shape of the electrical conductor may be rectangular, circular or other polygonal.

In a preferred embodiment, the conductor on the stationary contact is further provided with an insulating member, which forms part or all of an insulating protection for the conductor.

In a preferred embodiment, the insulating member is provided with an annular rib matched with the opening on the static contact, the annular rib is embedded in the opening, and the height of the annular rib is larger than that of the opening.

On the other hand, still provide an electric switch, include at least static contact, moving contact, explosion chamber, insulating housing, static contact, moving contact, explosion chamber are located in the insulating housing, the insulating housing includes base, base at least, the insulating housing is provided with at least one looks utmost point, and each looks utmost point sets up at least one electric arc passageway, electric arc passageway includes from the explosion chamber extends to the first electric arc passageway of passageway, from the passageway extends to the second electric arc passageway of base, and from the third electric arc passageway that the base extends to the electric arc discharge port, first electric arc passageway with the second electric arc passageway all with the passageway communicates with each other.

In this way, the communicated arc channel is formed at the front end part and the bottom of the switch, so that high-temperature and high-pressure gas generated during high-voltage and high-current breaking can pass through the arc channel, the arc is further cooled in the lengthened arc channel, and the arc is completely absorbed and dissipated in the switch, thereby realizing zero flashover and greatly improving the safety and reliability of the switch.

In a preferred embodiment, the base is provided with a stepped hole communicating the channel with the second arc channel, and the stepped hole is located below the stationary contact.

In a preferred embodiment, the large hole of the stepped hole is matched with the annular boss to limit the static contact, and the small hole of the stepped hole is communicated with the channel and the second arc channel.

The beneficial effects of the invention are as follows:

1. the fixed contact provided by the invention is provided with the channel for allowing the electric arc to pass through, so that high-temperature and high-pressure gas generated during high-voltage and high-current breaking can pass through and then flow to the outlet along the arc channel in the insulating shell, the high-temperature gas is further cooled in the arc channel, the temperature is greatly reduced when flowing to the outlet, and the condition for re-burning the electric arc is not provided, so that zero flashover is achieved.

2. The electric switch provided by the invention has the advantages that the arc channel is arranged by utilizing the length space inside the switch, so that the arc is completely absorbed and dissipated inside the switch, zero arcing of the switch body is realized, the safety and reliability of the use of the switch are greatly improved, an arc extinguishing cover is not required to be additionally arranged, the installation space of a circuit breaker is saved, and the applicability and safety of the circuit breaker are improved.

3. According to the invention, a plurality of branch arc channels can be simultaneously adopted in the same phase pole, so that high-temperature and high-pressure gas generated during high-voltage and high-current breaking is split into a plurality of channels, and is completely absorbed and dissipated in the arc channels, thereby realizing zero flashover and greatly improving the safety and reliability of the switch during breaking high-voltage fault current.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a static contact removing insulator provided by the present invention.

Fig. 2 is a schematic diagram of the overall structure of the static contact provided by the invention.

Fig. 3 is a schematic cross-sectional view of the stationary contact of fig. 1.

Fig. 4 is a perspective view of an electrical switch provided by the present invention.

Fig. 5 is a schematic cross-sectional view of the electrical switch of fig. 4 in a closed state.

Fig. 6 is a schematic exploded view of the structure of the electrical switch of fig. 4.

Fig. 7 is a schematic diagram of the path of an arc path of an electrical switch provided by the present invention.

Fig. 8 is a schematic view of a base structure of an electrical switch according to the present invention.

FIG. 9 is a schematic view of the base of FIG. 8 with first and second spacers inserted therein

Fig. 10 is a schematic view of a base structure of an electric switch according to the present invention.

Fig. 11 is a schematic view of a large cover structure of an electric switch according to the present invention.

Fig. 12 is a schematic diagram of a third arc path of an electrical switch according to the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by showing examples of the invention. The invention is in no way limited to any particular configuration and algorithm set forth below, but covers any modification, substitution, and improvement of elements, components without departing from the spirit of the invention.

The terms of the directions of the present invention such as "upper", "lower", "left", "right", "front", "rear" and the like are used with reference to the positions shown in the drawings.

Referring to fig. 1, an embodiment of the present invention provides a static contact 10, which includes a contact end 101 for contacting with a moving contact of an electrical switch, a terminal 103 for electrically connecting with the outside, and a conductor 102 connected between the contact end 101 and the terminal 103, wherein a channel 104 for passing through an arc is disposed on the conductor 102, and the channel 104 may be a notch 1041 formed on an edge of the conductor 102 or/and an opening 1042 on the conductor 102.

In this embodiment, the stationary contact 10 is of a multi-section bending structure, the terminal 103 extends along a horizontal direction, a connection hole for connecting with an external circuit is provided on the terminal 103, the conductor 102 is U-shaped, and includes a first section extending along an up-down direction, a second section extending along a horizontal direction, and a third section extending along an up-down direction, which are sequentially connected, the first section and the third section are bent along the same direction, the channel 104 is provided on the second section, the contact end 101 is provided at an end of the third section, and a contact silver point is provided on the contact end 101, the contact silver point can be made of an alloy material, and the contact end 101, the third section, and the second section approximately form an inverted-C structure.

It should be noted that the contact end 101 is not limited to being provided with an alloy contact structure, and in other embodiments, the contact end 101 may be provided with a chuck or a conductive portion structure without an alloy contact.

With continued reference to fig. 1, in particular, an annular boss 1043 is disposed around the opening 1042 of the fixed contact, and the annular boss 1043 and the contact end 101 are located on two opposite end surfaces of the fixed contact 10, and an annular boss is disposed around the opening of the fixed contact, so that on one hand, the sectional area of the copper bar of the fixed contact can be increased, and the current carrying capacity of the current can be increased; on the other hand, the annular boss can also play a role in installation and positioning, so that the static contact is convenient to accurately install in the base.

Referring to fig. 2 and 3, the stationary contact 10 further includes an insulating member 105 for performing a part or all of insulation protection on the electrical conductor 102, in this embodiment, the insulating member 105 is matched with the shape of the electrical conductor 102, the insulating member 105 is in a U-shaped plate structure with holes, the insulating member 105 includes a protective shell disposed on the surface of the electrical conductor 102 and a ring-shaped rib 1051 embedded in the opening, the outer diameter dimension of the ring-shaped rib 1051 is matched with the inner diameter dimension of the opening 1042, the ring-shaped rib 1051 is embedded in the opening 1042 and is tightly attached to the inner wall of the opening 1042, and meanwhile, the height of the ring-shaped rib 1051 is greater than the height of the opening 1042, so that the insulating member 105 performs an insulation protection function on the electrical conductor 102.

In this embodiment, the cross-section of the conductor 102 is rectangular, and the conductor with a plate-like structure is provided with a channel 104 through which the arc passes conveniently, which is simple in process and low in cost. Of course, in other embodiments, the cross-section of the conductor 102 may be configured in a circular shape or other polygonal or irregular shape, such as a conductor configuration having a circular cross-section when space is limited.

Referring to fig. 1 and 2, the shape of the opening 1042 is rectangular, and since the second section of the conductor 102 is in a cuboid structure, the shape of the opening 1042 is designed to be rectangular, so that the cross-sectional area of the opening is maximized, which is more beneficial to the rapid passing of the arc. In other embodiments, the shape of the openings may be matched according to the shape of the electrical conductors, which may be circular, diamond-shaped, triangular, or other irregular shapes.

Fig. 4 shows a perspective view of an electric switch according to an embodiment of the present disclosure, fig. 5 shows a schematic cross-sectional view of the switch, fig. 6 shows a schematic structural explosion of the electric switch, the switch includes an insulating housing 40, the fixed contact 10, the moving contact 20, the arc extinguishing chamber 30, the operating mechanism 50, the wire outlet 70, and the rotating shaft 80, the fixed contact 10, the moving contact 20, the arc extinguishing chamber 30, and the rotating shaft 80 are all disposed in the insulating housing 40, the insulating housing 40 includes a base 401, a base 402, and a cover 403, the base 401 is disposed between the base 402 and the cover 403, and the base 402, the base 401, and the cover 403 are fixed by screws, the wire end 103 of the fixed contact 10 extends out of the cavity and is connected with an external circuit, the moving contact 20 is connected with the wire outlet 70, and the base 401 and the cover 403 are buckled to form a closed space for accommodating the above elements.

It should be noted that, the electric switch of this embodiment adopts a 2P form, that is, includes A, B two phase poles, and may also adopt a 1P, 3P or 3p+n form for adjustment in specific practical application, which is not limited herein.

Specifically, the base 401 and the large cover 403 are clamped to form a plurality of independent cavities which are the same in number as the poles and are insulated from each other, the moving contact 20, the fixed contact 10 and the arc extinguishing chamber 30 of each phase are arranged in the corresponding phase cavity, the terminal 103 of the fixed contact 10 is arranged at the front end of each phase cavity, and the outlet terminal 70 is arranged at the rear end of each phase cavity.

Referring to fig. 6, the operation mechanism 50 is fixed in the base 401 by a screw, the operation mechanism 50 includes a handle 501 and an operation link mechanism, the handle 501 is disposed above the large cover 403, one end of the operation link mechanism is connected to the handle 501, the other end is connected to the rotating shaft, and the handle 501 is operated to move to drive the rotating shaft 80 to rotate, so as to move the moving contact, to realize opening and closing of the moving contact 20 and the fixed contact 10, and when the moving contact 20 and the fixed contact 10 are closed, the switch is closed, and the main circuit is in an energized state; when the movable contact 20 is disconnected from the fixed contact 10, the switch is opened, and the main circuit is in a power-off state.

With continued reference to fig. 5 and 6, the arc extinguishing chamber 30 is formed by arranging a plurality of arc extinguishing bars from bottom to top, the arc extinguishing chamber 30 is disposed above the fixed contact 10, the moving contact 20 is rotatably disposed on the operating mechanism 50 around a rotating shaft, the moving contact 20 is disposed behind the arc extinguishing chamber, when the moving contact is separated from the fixed contact to generate an arc, the arc enters the arc extinguishing chamber 30 and moves upward along the arc extinguishing chamber 30, the arc is cut by the arc extinguishing bars, the remaining arc enters the arc passage 90 connected with the arc extinguishing chamber 30 from the arc extinguishing chamber 30, the arc passage 90 includes a first arc passage 901 connected with the arc extinguishing chamber 30 and the passage 104, a second arc passage 902 connected with the passage 104, and a third arc passage 903 connected with the second arc passage 902 and extending to an arc discharge port.

The insulating housing 40 further includes a first partition 404 disposed in front of the arc extinguishing chamber 30 and a second partition 405 disposed at a front end of the switch, where the large cover 403, the first partition 404, the second partition 405, and the insulating member 105 on the stationary contact 10 together form a space, the space is a first arc channel 901 into which an arc enters from the arc extinguishing chamber 30, the second section of the conductor 102 extends along a length direction of the cavity, and the channel 104 is communicated with the first arc channel 901; the second arc channel 902 is formed by the base 401 and the base 402 together, the second arc channel 902 extending downwardly from the channel 104 to the base 402; the third arc channel 903 is formed by enclosing the lower surface of the base 401 and the upper surface of the base 402, the third arc channel 903 communicates with the second arc channel 902, and extends from the lower side of the channel 104 to the arc discharge port.

Specifically, referring to fig. 7, the first arc channel 901 extends from the bottom of the arc extinguishing chamber to the direction of the large cover 403 for a distance and turns 180 degrees to extend to the bottom direction and then reaches the channel 104, the second arc channel 902 extends from the channel 104 to the bottom direction for a distance and then reaches the base 402, the third arc channel 903 extends from the base bottom to the direction of the wire outlet 70 for a distance and then reaches the arc outlet, further, at least one arc channel 90 is provided for each phase, the arc channels 90 between the a phase and the B phase are insulated and sealed, specifically, the base 401, the large cover 403 and the base 402 are all provided with side walls separating the arc channels 90 of each phase, the side walls of the base 401 and the side walls of the large cover 403 are clamped to form insulating walls of the first arc channel 903 between adjacent phases, and the side walls of the base 401 and the base 402 are clamped to form insulating walls of the second arc channel 902 and the third arc channel 903 between the adjacent phases.

Referring to fig. 8 and 9, a stepped hole 4011 is formed in the base, the stepped hole 4011 is configured to communicate the channel 104 with the second arc channel 902, the static contact 10 extends in the base along the length direction of the base, the stepped hole 4011 is located below the static contact 10, a large hole 4012 of the stepped hole 4011 cooperates with the annular boss 1043 to limit the static contact 10, a small hole 4013 of the stepped hole 4011 is configured to communicate the channel 104 with the second arc channel 902, a slot for mounting the first partition board 404 and the second partition board 405 is formed in the inner wall of the front end of the base 401, after the first partition board 404 and the second partition board 405 are inserted into the slot, the base 401, the first partition board 404, the second partition board 405 and the insulator 105 are enclosed together to form a base cavity 4014, and 2 base cavities are formed in the front end of the base 401 in this embodiment.

Referring to fig. 10, a slot is also formed on the inner wall of the large cover 403, and when the large cover 403 is fastened to the base, the first partition 404 is inserted into the slot of the inner wall of the large cover, so that the large cover 403 and the first partition 404 enclose together to form a large cover cavity 4031, and 2 large cover cavities are formed at the front end of the large cover 403 in this embodiment, and the 2 large cover cavities are respectively corresponding to 2 base cavities. After the big cover and the base are buckled, a corresponding group of big cover cavities and base cavities jointly form a first arc channel 901.

Referring to fig. 11, a rib-shaped partition is provided on the base 402 to divide the space in the base, the base 402 and the base 401 are fastened to form a base cavity 4021, that is, the third arc channel 903, the middle position of the base cavity 4021 is divided by the rib-shaped partition, and the third arc channel 903 is divided into two branches from the rib-shaped partition.

Referring to fig. 12, the third arc channel 903 includes a left arc channel 9031 and a right arc channel 9032, and the left arc channel and the right arc channel are disposed in communication, in this embodiment, multiple arc channels may be simultaneously employed in the same phase pole, so that high-temperature and high-pressure gas generated during high-voltage and high-current breaking is split into multiple channels, and is completely absorbed and dissipated in the arc channels, thereby realizing zero flashover.

In this embodiment, the contact structures of the two phase poles A, B and the corresponding arc channels are identical, the arc extinguishing chamber 40 is located in front of the moving contact 20, the moving contact 20 and the fixed contact 10 are separated to generate an arc, the arc rapidly enters the arc extinguishing chamber 30 and is cut and cooled in the arc extinguishing chamber 30, and the arc flows through the grid plate in the arc extinguishing chamber 30 from bottom to top by adopting the air blowing principle, so that the grid plate at the upper part of the arc extinguishing chamber 30 can be effectively utilized, the high-temperature gas generated in the arc burning process of the arc extinguishing chamber 30 is further cooled in the arc channel 90 and then is discharged from the arc discharge outlet of the electric switch, the temperature of the gas flowing out after passing through the arc channel 90 is greatly reduced, and the arc re-burning condition is not provided, thereby achieving the purpose of zero arcing.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (11)

1. The static contact is characterized by comprising a contact end for contacting with a moving contact of an electric switch to conduct electricity, a wiring terminal for being electrically connected with the outside and a conductor connected between the contact end and the wiring terminal, wherein a passage for passing through an electric arc is arranged on the conductor.

2. The stationary contact according to claim 1, wherein the channel is a notch formed on an edge of the electrical conductor or/and an opening formed on the electrical conductor.

3. A stationary contact according to claim 2, characterized in that the shape of the opening is rectangular, circular, diamond-shaped, triangular or other irregular shape.

4. The stationary contact of claim 1, wherein an annular boss is disposed around the opening in the stationary contact, and the annular boss and the contact end are located on opposite end surfaces of the stationary contact.

5. The stationary contact of claim 1, wherein the contact end is a conductive alloy contact or a collet structure.

6. The stationary contact of claim 1, wherein the cross-sectional shape of the electrical conductor is rectangular, circular or other polygonal.

7. A stationary contact according to claim 1, characterized in that the electrical conductor is further provided with an insulation element, which forms part or all of the insulation protection for the electrical conductor.

8. The stationary contact of claim 7, wherein the insulator is provided with an annular bead that mates with an opening in the stationary contact, the annular bead being embedded in the opening, the annular bead having a height greater than the opening height.

9. An electrical switch comprising at least a stationary contact, a moving contact, an arc extinguishing chamber, and an insulating housing according to claims 1 to 8, wherein the stationary contact, the moving contact, and the arc extinguishing chamber are located in the insulating housing, the insulating housing comprises at least a base and a base, the insulating housing is provided with at least one phase pole, each phase pole is provided with at least one arc channel, the arc channel comprises a first arc channel extending from the arc extinguishing chamber to the channel, a second arc channel extending from the channel to the base, and a third arc channel extending from the base to an arc discharge opening, and the first arc channel and the second arc channel are both in communication with the channels.

10. The electrical switch of claim 9, wherein the base is provided with a stepped bore communicating the channel with the second arc channel, the stepped bore being located below the stationary contact.

11. The electrical switch of claim 10, wherein a large aperture of said stepped bore cooperates with said annular boss to limit said stationary contact, and a small aperture of said stepped bore communicates said passage with said second arc passage.