CN111477473A - Contact piece structure beneficial to rapid arc extinguishing - Google Patents
Contact piece structure beneficial to rapid arc extinguishing Download PDFInfo
- Publication number
- CN111477473A CN111477473A CN202010532674.1A CN202010532674A CN111477473A CN 111477473 A CN111477473 A CN 111477473A CN 202010532674 A CN202010532674 A CN 202010532674A CN 111477473 A CN111477473 A CN 111477473A
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- CN
- China
- Prior art keywords
- contact
- arc
- contact piece
- projection
- plane
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
- H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to the field of electrical switches and discloses a contact piece structure beneficial to rapid arc extinction, which comprises a static contact piece, a movable contact piece and an arc extinction groove, wherein the movable contact piece rotates around a central shaft; the movable contact piece comprises a contact part, and the static contact piece is positioned in a contact plane vertical to the central shaft; the projection of the arc-extinguishing groove on the contact plane is basically fan-shaped; the contact part is provided with an arc striking bulge at one side facing to the corresponding static contact piece; the vertical distance from the projection of the arc striking protrusion on the contact plane to the long axis of the movable contact piece is greater than the vertical distance from the rest part of one side of the arc striking protrusion of the contact part to the long axis of the movable contact piece; the distance from the projection of the arc striking protrusion on the contact plane to the circle where the large arc of the fan ring is located is not less than one half of the distance from the projection to the circle where the small arc of the fan ring is located; the projection of the arc striking bulge on the contact plane is positioned within the circle of the large circular arc of the fan ring. The arc striking protrusion can guide the electric arc to the inner side of the arc extinguishing groove when the arc is extinguished, so that the oxygen supply of the electric arc is greatly reduced, and the electric arc can be quickly extinguished.
Description
Technical Field
The invention relates to the field of electrical switches, in particular to a contact piece structure beneficial to rapid arc extinction.
Background
Electrical switches are electrical components commonly used in everyday life that can open a circuit, interrupt current, or allow it to flow to other circuits. There are one or more contacts in the switch. The "closed" (ON) of a contact indicates that the contact is conductive, allowing current to flow; an "open" (OFF) of the switch indicates that the contacts are non-conductive to form an open circuit and not allow current to flow.
When the electric switch is applied to direct current, because the direct current is not over zero, the arc is stretched for a long time when the electric switch is disconnected, and the switch is required to have better arc extinguishing performance so as to reduce arc discharge. However, many current electrical switches have the problem that parts are burnt due to the fact that direct current arc extinguishing time is too long and even arc extinguishing cannot be performed, and most of the reasons are that the structural design of the contact piece is reasonable and arc extinguishing cannot be performed effectively.
Some electrical switches adopt a narrow-slit arc extinguishing method, but the existing structure can not effectively guide the electric arc into the narrow slit during arc extinguishing, so that the rapid arc extinguishing can not be realized.
Disclosure of Invention
The invention provides a contact piece structure beneficial to rapid arc extinguishing, which solves the technical problem that an electric switch with the contact piece structure cannot rapidly extinguish arcs.
The electrical switch contact structure includes:
at least one fixed static contact piece, at least one movable contact piece rotating around a central shaft and at least one arc extinguishing groove;
the movable contact piece comprises a contact part, and the contact part corresponds to at least one static contact piece; the static contact is positioned in at least one contact plane vertical to the central shaft; when the movable contact piece rotates around the central shaft to be contacted with the static contact piece, the contact part is contacted with the corresponding static contact piece to connect a circuit; when the movable contact piece rotates around the central shaft to be separated from the static contact piece, the contact part is separated from the corresponding static contact piece, and the circuit is disconnected;
the projection of the arc extinguishing groove on the contact plane between the contact part and the corresponding static contact piece is basically in the shape of a fan ring with the central shaft as the center of a circle, and the fan ring comprises a large arc and a small arc;
the method is characterized in that:
the contact part is provided with an arc striking bulge at one side facing to the corresponding static contact piece;
the vertical distance from the projection of the arc striking protrusion on the contact plane to the long axis of the movable contact piece is greater than the vertical distance from the rest part of one side of the arc striking protrusion of the contact part to the long axis of the movable contact piece; the long axis of the movable contact piece is positioned in the contact plane, passes through the central shaft and is basically parallel to the long extension direction of the movable contact piece;
the distance from the projection of the arc striking protrusion on the contact plane to the circle where the large arc is located is not less than one half of the distance from the projection to the circle where the small arc is located;
the projection of the arc striking protrusion on the contact plane is positioned within the circle of the large arc.
Preferably, the projection of the arc striking protrusion on the contact plane is located outside the circle where the small arc is located.
Preferably, a projection of the arc striking protrusion and a connection of an extension part of the contact part in a direction away from the central axis along the long axis of the movable contact piece on the contact plane is a straight line.
Preferably, a projection of the arc striking protrusion and a connection of the contact portion extending in a direction away from the central axis along the long axis of the movable contact piece on the contact plane is a curve.
Compared with the prior art, the technical scheme has the advantages that: the movable contact piece is provided with the arc striking protrusion, the arc striking protrusion is arranged at the position relative to the inner side of the arc extinguishing groove, and the arc can be guided to the inner side of the arc extinguishing groove during arc extinguishing, so that the arc is lengthened, the oxygen supply of the arc is greatly reduced, and the arc can be quickly extinguished. Therefore, the arc extinguishing performance of the electrical switch can be greatly improved, and the safety performance of the product is improved.
Drawings
Fig. 1 is a schematic diagram of a contact structure for rapid arc extinction according to the present invention.
Fig. 2 is a schematic view of the movable and stationary contacts of the present invention in the closed position.
Figure 3 is a schematic view of the projection of the moving contact, the static contact and the arc chute of the present invention on the contact plane.
Figure 4 is a schematic view of the projection of the moving contact, the stationary contact and the arc chute of the present invention on the contact plane.
Fig. 5 is a schematic view of the projection of the moving contact of the present invention onto the contact plane.
Fig. 6 is a schematic view of the projection of the moving contact of the present invention onto the contact plane.
Fig. 7 is a schematic view of the projection of the moving contact of the present invention onto the contact plane.
Wherein: 010-static contact piece; 020-moving contact piece; 021-contact part; 0211-arc striking bulge; 0212-contact connection; s21-vertical distance from arc striking bulge to long axis of movable contact; 030-arc chute; 0301-arc chute great circle; 0302-arc chute minor arc; s31-the distance between the arc striking bulge and the circle where the arc extinguishing groove orthodrome is located; s32-distance between arc-striking bulge and arc-extinguishing groove small arc circle.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Embodiment a of the present invention is shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, which is a contact structure facilitating rapid arc extinction, and includes a fixed static contact 010, a movable contact 020 rotating around a central axis Z, and an arc extinguishing groove 030.
The movable contact piece 020 comprises a contact part 021, and the contact part 021 corresponds to the static contact piece 010; the static contact 010 is located in a contact plane a perpendicular to the central axis Z; when the movable contact piece 020 rotates around the central axis Z to contact with the static contact piece 010, the contact part 021 contacts with the corresponding static contact piece 010 to connect a circuit; when the movable contact piece 020 turns around the center axis Z to be separated from the stationary contact piece 010, the contact part 021 is separated from the corresponding stationary contact piece 010, and the circuit is disconnected.
The contacting part 021 is provided with the perk 0212 towards its one side that corresponds the static contact piece, and the motion is smooth and easy when the contacting part 021 contacts with static contact piece 010.
The portion of the arc chute 030 projected on the contact plane a between the contact portion 021 and its corresponding stationary contact 010 substantially forms a sector ring shape centered on the central axis Z, the sector ring including a large arc 0301 and a small arc 0302.
The contact parts 021 are arranged with ignition projections 0211 on the side towards their corresponding stationary contact piece 010.
The vertical distance S21 of the projection of the arc initiation protrusion 0211 on the contact plane A to the long axis X of the movable contact is larger than the vertical distance of the rest part of one side of the arc initiation protrusion 0211 of the contact part 021 to the long axis X of the movable contact; that is, in fig. 5, the highest point of the striking projection 0211 is the highest point of the portion of the contact part 021 on the upper side of the major axis X of the movable contact piece.
The moving contact long axis X lies in the contact plane a, passes through the central axis Z and is substantially parallel to the long extension direction of the moving contact 020.
The distance S31 from the projection of the ignition protrusion 0211 on the contact plane A to the circle where the large arc 0301 is located is not less than half of the distance S32 from the projection to the circle where the small arc 0301 is located.
The projection of the arc ignition protrusion 0211 on the contact plane A is positioned within the circle of the great arc 0302.
The projection of the ignition projection 0211 on the contact plane a lies outside the circle on which the small arc 0302 lies.
The projection of the ignition projection 0211 onto the contact plane a is a straight line with the connection 0212 of the contact part 021 which extends in the direction away from the central axis Z along the long axis X of the movable contact.
Embodiment B of the present invention is shown in FIG. 6, and embodiment C is shown in FIG. 7
The projection of the ignition projection 0211 onto the contact plane a is curved with the connection 0212 of the contact part 021 which extends in the direction of the long axis X of the movable contact away from the central axis Z.
Embodiment B differs from embodiment C in the shape of the projected curve.
Set up the striking arch at the contact site of movable contact spring through above, the striking arch is arranged in the position inboard for the arc-extinguish chamber, can guide electric arc to the arc-extinguish chamber inboard when the arc extinguishing, has not only lengthened electric arc, makes the oxygen supply of electric arc significantly reduce moreover to make electric arc can extinguish fast. Therefore, the arc extinguishing performance of the electrical switch can be greatly improved, and the safety performance of the product is improved.
The structures, ratios, sizes, quantities, and the like shown in the drawings of the embodiments of the present invention are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship may be made without substantial technical changes.
Claims (4)
1. A contact piece structure beneficial to rapid arc extinction comprises at least one fixed static contact piece (010), at least one movable contact piece (020) rotating around a central shaft (Z), and at least one arc extinguishing groove (030);
the movable contact piece (020) comprises a contact part (021), and the contact part (021) corresponds to at least one of the static contact pieces (010); the static contact (010) is located in at least one contact plane (A) perpendicular to the central axis (Z); when the movable contact piece (020) rotates around the central shaft (Z) to be contacted with the static contact piece (010), the contact part (021) is contacted with the corresponding static contact piece (010) to connect a circuit; when the movable contact piece (020) rotates around the central shaft (Z) to be separated from the static contact piece (010), the contact part (021) is separated from the corresponding static contact piece (010), and the circuit is disconnected;
the projection of the arc extinguishing groove (030) on the contact plane (A) between the contact part (021) and the corresponding static contact (010) is basically in the shape of a sector ring taking the central axis (Z) as the center of a circle, and the sector ring comprises a large arc (0301) and a small arc (0302);
the method is characterized in that:
the contact part (021) is provided with an arc striking bulge (0211) at one side facing to the corresponding static contact piece (010);
the vertical distance from the projection of the arc ignition bulge (0211) on the contact plane (A) to the long axis (X) of the movable contact is greater than the vertical distance from the rest part of one side of the arc ignition bulge (0211) of the contact part (021) to the long axis (X) of the movable contact; the long axis (X) of the movable contact piece is positioned in the contact plane (A), passes through the central shaft (Z) and is basically parallel to the long extension direction of the movable contact piece (020);
the distance from the projection of the arc ignition bulge (0211) on the contact plane (A) to the circle of the large circular arc (0301) is not less than one half of the distance from the projection to the circle of the small circular arc (0301);
the projection of the arc striking protrusion (0211) on the contact plane (A) is positioned within the circle of the great arc (0302).
2. Contact blade structure according to claim 1, characterized in that the projection of the striking bulge (0211) onto the contact plane (a) lies outside the circle on which the minor arc (0302) lies.
3. Contact blade structure according to claim 2, characterized in that the projection of the connection (0212) of the striking projection (0211) with the part of the contact part (021) extending in the direction of the long axis (X) of the moving contact away from the central axis (Z) onto the contact plane (a) is a straight line.
4. Contact blade structure according to claim 2, characterized in that the projection of the connection (0212) of the striking projection (0211) to the part of the contact part (021) extending in the direction of the long axis (X) of the moving contact away from the central axis (Z) onto the contact plane (a) is a curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010532674.1A CN111477473A (en) | 2020-06-12 | 2020-06-12 | Contact piece structure beneficial to rapid arc extinguishing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010532674.1A CN111477473A (en) | 2020-06-12 | 2020-06-12 | Contact piece structure beneficial to rapid arc extinguishing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111477473A true CN111477473A (en) | 2020-07-31 |
Family
ID=71765344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010532674.1A Pending CN111477473A (en) | 2020-06-12 | 2020-06-12 | Contact piece structure beneficial to rapid arc extinguishing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111477473A (en) |
-
2020
- 2020-06-12 CN CN202010532674.1A patent/CN111477473A/en active Pending
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