CN107731580B - Automatic change-over switch electrical apparatus and contact assembly thereof - Google Patents
Automatic change-over switch electrical apparatus and contact assembly thereof Download PDFInfo
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- CN107731580B CN107731580B CN201710868053.9A CN201710868053A CN107731580B CN 107731580 B CN107731580 B CN 107731580B CN 201710868053 A CN201710868053 A CN 201710868053A CN 107731580 B CN107731580 B CN 107731580B
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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
- H01H9/0005—Tap change devices
- H01H9/0016—Contact arrangements for tap changers
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Abstract
The invention relates to a contact assembly of an automatic transfer switching device, which comprises a moving contact and a fixed contact. The moving contact comprises two conducting strips arranged side by side and a clamping mechanism for keeping the two conducting strips in a clamping state; and two opposite inner sides of one ends of the two conducting strips are respectively provided with a conducting contact, and a gap is reserved between the two conducting contacts for the static contact to be clamped in and to be in contact conduction with the conducting contacts. The contact surface of the moving contact and the static contact is provided with two surfaces, so that the contact area and the friction surface between the contacts are increased, and when the moving contact and the static contact are switched on and off, the oxidation layer and dirt on the surface of the contact can be removed through the transverse moving friction self-cleaning action of the moving contact and the static contact, so that the contact resistance can be kept at an extremely low level in the service life of the whole product. Meanwhile, the moving contact and the static contact have no bounce when just contacting, the electrical service life of the contacts is prolonged, and because the two moving contacts flow currents in the same direction, mutually attracted electrodynamic forces are generated, the repulsive force between the moving contact and the static contact can be effectively offset, and the capacity of the contacts for bearing short-circuit current is greatly improved.
Description
Technical Field
The invention relates to the field of automatic transfer switching equipment, in particular to automatic transfer switching equipment and a contact assembly thereof.
Background
The automatic change-over switch electric appliance is a common low-voltage electric appliance, is commonly used in important power distribution occasions, is used for switching two paths of power supplies, ensures that the common power supply is quickly switched to a standby power supply when the common power supply fails in the power supply process, and ensures the normal power supply of a load end.
PC-level automatic transfer switching devices are often required to be able to switch between two power sources, to switch on and carry short-circuit currents, and not to break short-circuit currents, and to perform short-circuit protection of the PC-level automatic transfer switching devices and the entire load circuit by means of a front-end short-circuit protection device (SCPD: circuit breaker or fuse).
Therefore, the PC-level automatic transfer switching equipment is more focused on the reliability under the normal use condition and the capacity of the transfer switching equipment for bearing short-circuit current impact within a certain time, and has the specific requirements of low temperature rise, larger rated limit short-circuit current, rated short-time withstand current and the like, and fusion welding does not occur after the short-circuit current impact is borne.
The existing PC-level automatic transfer switch electric appliance usually adopts a clapper type contact, although the structure is simple, the contact has no self-cleaning effect in the separation and combination process, and after long-term use, the contact resistance is larger, the temperature is increased, and the service life of the switch is shortened due to the oxidation of a silver coating layer on the surface of the contact; when a moving contact of the clapper type contact system is just contacted with a fixed contact, bouncing easily occurs, and the contact is burnt out by arcing; meanwhile, when short-circuit current is carried in a certain time, the electric repulsion force between the contacts causes the pressure reduction of the contacts and the contact instability of the contacts, so that the fusion welding and the arc combustion of the contacts are easily caused, the electric appliance is damaged, and the requirements of a modern power supply and distribution system, especially a mixed load power supply occasion cannot be met.
Disclosure of Invention
The invention aims to provide an improved automatic transfer switching device and a contact assembly thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the contact assembly of the automatic transfer switching equipment comprises a moving contact and a fixed contact;
the moving contact comprises two conducting strips arranged side by side and a clamping mechanism for keeping the two conducting strips in a clamping state;
and two opposite inner sides of one end of the two conducting strips are respectively provided with a conducting contact, and a gap is reserved between the two conducting contacts for the static contact to be clamped in and to be in contact conduction with the conducting contacts.
Preferably, the clamping mechanism comprises two supporting pieces respectively arranged on two opposite sides of the conducting strips so as to improve the strength of the two conducting strips.
Preferably, fixture still includes shell fragment and clamp, the shell fragment includes two, sets up respectively two support piece's the side of the back of the body, the clamp is connected two between the shell fragment, lets the shell fragment provides elasticity and keeps two conducting strip is close to the centre gripping.
Preferably, the clamp is U-shaped, and the both ends of clamp are in two the back of the body side of shell fragment respectively centre gripping.
Preferably, the edges of the two supporting pieces are respectively provided with an extending part, and the extending part on each supporting piece extends from the side surface of the conducting strip to the other supporting piece;
the two extending parts on the supporting parts are oppositely arranged, and each extending part is provided with a clamping groove for clamping the hoop.
Preferably, the spring plate is provided with an inner groove for positioning the hoop, and the inner groove is bent towards the supporting piece on the side where the inner groove is located.
Preferably, the conductive contact is a silver alloy contact, and the static contact includes a copper body and a silver plating layer plated outside the copper body.
Preferably, the moving contact further comprises a connecting piece and a pin shaft, wherein the connecting piece is provided with an insertion hole for the conducting strip and the clamping mechanism to penetrate through, and the pin shaft penetrates through the connecting piece, the clamping mechanism and the conducting strip to connect and position the connecting piece, the clamping mechanism and the conducting strip;
the connecting piece is rotatably arranged to drive the conducting strip and the clamping mechanism to swing, so that the conducting strip and the clamping mechanism are conducted and separated from the static contact.
Preferably, both sides of the connecting piece are respectively provided with a concave gear mounting hole and a convex transmission gear so as to drive the connecting piece to rotate after being connected with the connecting piece, and the two conducting strips are arranged along the rotating axis direction of the connecting piece.
The invention also constructs an automatic transfer switching device which comprises the contact assembly.
The automatic transfer switching equipment and the contact assembly thereof have the following beneficial effects: the contact surface of the moving contact and the static contact has two surfaces, so that the contact area and the friction surface between the contacts are increased, and when the moving contact and the static contact of the transfer switch electric appliance are switched on and off, an oxidation layer and dirt on the surfaces of the contacts can be removed through the transverse moving friction self-cleaning action of the moving contact and the static contact, so that the contact resistance can be kept at an extremely low level in the service life of the whole product.
Meanwhile, the two moving contacts flow through currents in the same direction to generate mutually attracted electrodynamic forces, so that repulsive force between the moving contacts and the static contacts can be effectively offset, the capacity of the contacts for bearing short-circuit current is greatly improved, and the short-time current tolerance and the capacity for limiting short-circuit current can be higher.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic perspective view of a contact assembly of an automatic transfer switching apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural view of the connecting member of the movable contact in fig. 1, the conductive plate and the clamping mechanism when they are disassembled;
fig. 3 is a schematic structural diagram of the conductive sheet and the clamping mechanism of the movable contact in fig. 2 when exploded;
fig. 4 is a schematic structural view of the conductive sheet and the support member of fig. 2 when assembled.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the automatic transfer switching apparatus according to a preferred embodiment of the present invention includes a contact assembly 1, and the contact assembly 1 includes a moving contact 11 and a stationary contact 12.
As shown in fig. 2 to fig. 3, the movable contact 11 includes two conductive plates 111 arranged side by side, and a clamping mechanism 112 for holding the two conductive plates 111 in a clamped state. Two opposite inner sides of one end of the two conductive sheets 111 are respectively provided with a conductive contact 1111, and a gap is left between the two conductive contacts 1111 for the static contact 12 to be clamped in and to be in contact with the conductive contact 1111. The moving contact 11 is used as a clamping moving contact 11, and the static contact 12 is used as a knife-type static contact 12.
The contact surface of the moving contact 11 and the static contact 12 has two surfaces, so that the contact area and the friction surface between the contacts are increased, and when the moving contact 12 and the static contact 12 of the transfer switch electric appliance are switched on and off, an oxidation layer and dirt on the surfaces of the contacts can be removed through the transverse moving friction self-cleaning effect of the moving contact 12 and the static contact 12, so that the contact resistance can be kept at an extremely low level in the service life of the whole product.
Meanwhile, the moving contact 11 and the static contact 12 are not bounced when in contact, the electrical service life of the contact is prolonged, and simultaneously, because the two moving contacts 11 flow currents in the same direction, mutually attracted electrodynamic forces are generated, the repulsive force between the moving contact 11 and the static contact 12 can be effectively offset, and the capacity of the contact for bearing short-circuit current is greatly improved.
Further, the conductive contact 1111 is a silver alloy contact, and the stationary contact 12 includes a copper body and a silver plating layer plated outside the copper body. By using the different material matching relationship between the silver alloy contact on the conducting strip 111 and the knife-shaped static contact 12, the probability of fusion welding is reduced when the contact part has excessive current.
The silver alloy contact is welded on the conducting strip 111, and the silver alloy contact can be connected on the conducting strip 111 through other locking parts. The silver alloy contact is V-shaped, and the V-shaped opening is opposite to the static contact 12, so that impurities such as powder generated by friction of the movable contact 11 and the static contact 12 can be scraped by the opening, and a self-cleaning effect is achieved.
The automatic transfer switching device of the invention can have larger short-time current-resisting capability and short-circuit current-limiting capability, in other embodiments, the surface of the conductive contact 1111 can also be a silver coating or the conductive contact 1111 can be directly made of copper or silver alloy, and the static contact 12 can also be directly made of copper or silver alloy.
The clamping mechanism 112 includes two supporting members 1121 respectively disposed on two opposite sides of the conductive sheet 111 to enhance the strength of the two conductive sheets 111. The supporting member 1121 ensures the strength of the conducting strip 111, so as to improve the clamping force when clamping the static contact 12, and ensure that the moving contact 11 has good conductivity and mechanical strength.
Further, the clamping mechanism 112 further includes a spring 1122 and a clip 1123. The elastic pieces 1122 include two pieces, which are respectively disposed on opposite sides of the two supporting pieces 1121. The clamp 1123 is connected between the two elastic sheets 1122 to provide support for the elastic sheets 1122, so that the elastic sheets 1122 provide elastic force to keep the two conductive sheets 111 close to each other. The shape of the elastic sheet 1122 is not limited, and after being mounted on the support 1121 or the conductive sheets 111 and clamped by the clamp 1123, the elastic sheet provides an elastic force to keep the two conductive sheets 111 close to and clamp the stationary contact 12.
In some embodiments, the band 1123 is U-shaped, and two ends of the band 1123 are clamped to opposite sides of the spring plates 1122. In order to ensure that the position of the clamp 1123 is not easily deviated, the spring 1122 is provided with an inner groove 1124 for positioning the clamp 1123, and the inner groove 1124 is deformed and bent towards the supporting member 1121 at the side thereof for the clamp 1123 to be clamped into. In other embodiments, the clamp 1123 can be a closed structure, and is sleeved outside the spring 1122.
Furthermore, the edges of the two supporting members 1121 are respectively provided with an extending portion 1125, and the extending portion 1125 of each supporting member 1121 extends from the side surface of the conductive sheet 111 to the other supporting member 1121. The extending portions 1125 of the two supporting members 1121 are disposed opposite to each other, and each extending portion 1125 is provided with a slot 1126 into which the hoop 1123 is inserted.
The location of the clamp 1123 has the limitation of the clamping groove 1126 and the inner groove 1124, the position is more stable, and the stability of the clamping force of the clamping mechanism 112 is also ensured. In other embodiments, the collar 1123 may be positioned by only one of the slots 1126, the inner slot 1124, or by other positioning structures.
In some embodiments, the movable contact 11 further includes a connecting member 113 and a pin 114, the connecting member 113 is connected to an external mechanism, and when the connecting member 113 is driven to rotate, the conducting strip 111 and the clamping mechanism 112 synchronously swing, so as to ensure uniform movement of the movable contact 11.
The connector 113 is provided with an insertion hole 1131 for the conductive sheet 111 and the clamping mechanism 112 to penetrate through, and the conductive contact 1111 at one end of the conductive sheet 111 extends out of the insertion hole 1131 for the stationary contact 12 to be inserted and connected. The pin 114 penetrates through the connecting member 113, the clamping mechanism 112 and the conductive sheet 111, and connects and positions the connecting member 113, the clamping mechanism 112 and the conductive sheet 111 to form a whole, so that each component of the movable contact 11 can move synchronously when the connecting member 113 rotates.
Further, the connecting member 113 is rotatably disposed to drive the conductive sheet 111 and the clamping mechanism 112 to swing, so as to achieve conduction and separation with the stationary contact 12.
The two sides of the connecting member 113 are respectively provided with a concave gear mounting hole 1132 and a convex transmission gear 1133, after the external mechanism is connected with the connecting member 113, the connecting member 113 is driven to rotate, and the two conducting strips 111 are arranged along the rotating axis direction of the connecting member 113.
The external mechanism transmits power through the gear mounting hole 1132 and the transmission gear 1133 to drive the movable contact 11 to rotate, so that the opening and closing of the movable and static contacts 12 are realized.
The moving contact 11 is externally provided with a connecting terminal 13, the connecting terminal 13 is connected with the conducting strip 111 through a wire 14, the wire 14 is a soft copper stranded wire, and two ends of the soft copper stranded wire are welded to the connecting terminal 13 and the conducting strip 111.
It is to be understood that the above-described respective technical features may be used in any combination without limitation.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A contact assembly (1) of an automatic transfer switching device is characterized by comprising a moving contact (11) and a fixed contact (12);
the moving contact (11) comprises two conducting strips (111) arranged side by side and a clamping mechanism (112) for keeping the two conducting strips (111) in a clamping state;
two opposite inner sides of one end of each of the two conducting strips (111) are respectively provided with a conducting contact (1111), and a gap is reserved between the two conducting contacts (1111) for the static contact (12) to be clamped in and to be in contact conduction with the conducting contacts (1111);
the conductive contact (1111) is welded on the conductive sheet (111), and a V-shaped opening is arranged on the conductive contact (1111) and is opposite to the static contact (12);
the clamping mechanism (112) comprises two supporting pieces (1121) which are respectively arranged on two opposite side surfaces of the conducting pieces (111) and used for improving the strength of the two conducting pieces (111), two elastic pieces (1122) which are arranged on opposite sides of the two supporting pieces (1121) and a clamp (1123) which is connected between the two elastic pieces (1122) and used for providing elastic force to ensure that the two conducting pieces (111) are close to the clamping, and two ends of the clamp (1123) are respectively clamped on the opposite sides of the two elastic pieces (1122);
the edges of the two supports (1121) are respectively provided with an extension part (1125), and the extension part (1125) on each support (1121) extends from the side surface of the conducting strip (111) to the other support (1121);
the extending parts (1125) on the two supporting parts (1121) are arranged oppositely, and each extending part (1125) is provided with a clamping groove (1126) for the clamping hoop (1123) to clamp into; the conductive contact (1111) is a silver alloy contact, and the static contact (12) comprises a copper body and a silver coating plated outside the copper body.
2. The contact assembly (1) of the automatic transfer switching apparatus according to claim 1, wherein the spring plate (1122) is provided with an inner groove (1124) for positioning the clamp (1123), and the inner groove (1124) is deformed and bent toward the supporting member (1121) at the side thereof.
3. The contact assembly (1) of the automatic transfer switching apparatus according to any one of claims 1 to 2, wherein the movable contact (11) further comprises a connecting member (113) and a pin (114), the connecting member (113) is provided with an insertion hole (1131) for the conductive sheet (111) and the clamping mechanism (112) to penetrate, and the pin (114) penetrates through the connecting member (113), the clamping mechanism (112) and the conductive sheet (111) to connect and position the connecting member (113), the clamping mechanism (112) and the conductive sheet (111);
the connecting piece (113) is rotatably arranged to drive the conducting strip (111) and the clamping mechanism (112) to swing, so that the conducting strip and the static contact (12) are conducted and separated.
4. The contact assembly (1) of the automatic transfer switching apparatus according to claim 3, wherein both sides of the connecting member (113) are respectively provided with a concave gear mounting hole (1132) and a convex transmission gear (1133) to drive the connecting member (113) to rotate after being connected with the connecting member (113), and the two conductive sheets (111) are arranged along the direction of the rotation axis of the connecting member (113).
5. An automatic transfer switching apparatus, characterized in that it comprises a contact assembly (1) according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710868053.9A CN107731580B (en) | 2017-09-22 | 2017-09-22 | Automatic change-over switch electrical apparatus and contact assembly thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710868053.9A CN107731580B (en) | 2017-09-22 | 2017-09-22 | Automatic change-over switch electrical apparatus and contact assembly thereof |
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| Publication Number | Publication Date |
|---|---|
| CN107731580A CN107731580A (en) | 2018-02-23 |
| CN107731580B true CN107731580B (en) | 2020-04-28 |
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| CN201710868053.9A Active CN107731580B (en) | 2017-09-22 | 2017-09-22 | Automatic change-over switch electrical apparatus and contact assembly thereof |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108878185B (en) * | 2018-06-05 | 2020-02-28 | 深圳市泰永电气科技有限公司 | Two-stage automatic change-over switch electric appliance |
| CN109755046B (en) * | 2019-01-15 | 2024-10-01 | 浙江正泰电器股份有限公司 | Contact system of static contact and automatic change-over switch |
| CN112133584B (en) * | 2020-10-15 | 2023-03-31 | 施耐德万高（天津）电气设备有限公司 | Rotary plug-in contact |
| CN114220677A (en) * | 2021-12-30 | 2022-03-22 | 雷顿电气科技有限公司 | Automatic change-over switch electric appliance |
| CN117492575B (en) * | 2024-01-03 | 2024-03-08 | 凯晖科技股份有限公司 | Ultrathin and foldable TP touch keyboard |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2340079Y (en) * | 1998-09-08 | 1999-09-22 | 武进市新苑电力配件厂 | Probe for connector of main circuit |
| ES2180421B1 (en) * | 2001-03-30 | 2004-04-01 | Grupo Ormazabal, S.A. | BLOCK OF CONTACT BLADES FOR CUTTING LOAD SWITCHES. |
| EP2674951B1 (en) * | 2012-06-11 | 2018-08-08 | ABB Oy | Electric current switching apparatus |
| CN104269293B (en) * | 2014-10-11 | 2016-06-15 | 成都瑞联电气股份有限公司 | A kind of universal seclector with magnetic quenching function |
| CN206401190U (en) * | 2016-11-17 | 2017-08-11 | 武汉长海电气科技开发有限公司 | The structure of contact terminal and disconnecting switch of grafting form |
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