CN217386916U - Contact structure for automatic change-over switch - Google Patents

Contact structure for automatic change-over switch Download PDF

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Publication number
CN217386916U
CN217386916U CN202220525849.0U CN202220525849U CN217386916U CN 217386916 U CN217386916 U CN 217386916U CN 202220525849 U CN202220525849 U CN 202220525849U CN 217386916 U CN217386916 U CN 217386916U
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China
Prior art keywords
contact
shaft
connecting rod
automatic transfer
contact surface
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CN202220525849.0U
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Chinese (zh)
Inventor
陈沛宇
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Shanghai Renmin Electrical Apparatus Works Co Ltd
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Shanghai Renmin Electrical Apparatus Works Co Ltd
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Priority to CN202220525849.0U priority Critical patent/CN217386916U/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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Abstract

The utility model relates to a contact structure for automatic transfer switch, which comprises a driving connecting rod, a lower connecting rod, a moving contact, a contact support, a connecting plate, a static contact and a high-resistance connecting piece, wherein the driving connecting rod is provided with a square hole, a square shaft is inserted in the square hole, and the square shaft can be in transmission connection with an operating mechanism of the automatic transfer switch; one end of the lower connecting rod is coupled with the driving connecting rod through a first connecting shaft; the contact support is connected with the moving contact through a second connecting shaft and a third connecting shaft at 2 shaft holes, the second connecting shaft is connected with the other end of the lower connecting rod, the third connecting shaft is connected to the base of the automatic change-over switch, and the driving connecting rod, the lower connecting rod, the contact support and the base of the automatic change-over switch form a four-bar structure. Compared with the prior art, the utility model discloses can reduce disconnected electric current and can reduce arc voltage and electric current for the moving contact partial pressure to this realizes better arc extinguishing effect, reduces the switch-on and divides disconnected electric current to give the injury that the switch body brought.

Description

Contact structure for automatic change-over switch
Technical Field
The utility model belongs to the technical field of a low-voltage apparatus, dual supply automatic transfer switch and specifically relates to a contact structure for automatic transfer switch is related to.
Background
The dual-power automatic transfer switch is automatically connected to a standby power supply through the dual-power transfer switch when the power is suddenly cut off, so that the operation of people is not stopped and can still continue to operate. The dual-power automatic transfer switch is used for one way of standby power supply simply, and when common power fails or is in power failure, the common power supply is automatically switched into the standby power supply through the dual-power transfer switch (the standby power supply can also be supplied with power by a generator under small load), so that equipment can still normally operate. The UPS for the bank is also used for the most common elevators, fire control and monitoring, but the spare battery of the UPS is used for the bank.
Most of the current dual-power automatic transfer switches are of single-breakpoint structures, a moving contact and a connecting plate are connected hard or soft, a hard connection finger contact is directly contacted with the connecting plate, and a soft connection finger contact is connected with the connecting plate through a conductive flexible wire. When the switch is switched on and switched off, high-energy electric arc and heat can be generated, and the electric arc and the heat are concentrated between the moving contact and the static contact, so that the moving contact and the static contact of the switch can be greatly damaged, and the switch body can be destroyed in serious conditions, so that the switch can not be used continuously.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a contact structure for automatic change over switch in order to overcome the defect that above-mentioned prior art exists, can reduce disconnected electric current and can reduce arc voltage and electric current for moving contact partial pressure to this realizes better arc extinguishing effect, reduces the switch-on and divides the injury that disconnected electric current brought for the switch body.
The applicant makes the following analysis in concept, the connection and disconnection index is an important parameter of the dual-power transfer switch, electric arcs generated when disconnection and disconnection currents are connected can damage the disconnection parts of the movable and fixed contacts, and the switch body can be greatly damaged to be incapable of being used continuously when the disconnection and disconnection currents are connected. The contact part of present special type change over switch is mostly single breakpoint structure, and the sound contact between load end and the power end only has a breakpoint, is connected through the conductive cord between moving contact and the connection board. When the structure is connected and disconnected with larger current, electric arc and a large amount of heat are generated between the moving contact and the static contact, so that the live operation service life and the magnitude and the frequency of the connected current are not high.
The purpose of the utility model can be realized through the following technical scheme:
the utility model aims at protecting a contact structure for automatic transfer switch, including drive connecting rod, lower connecting rod, moving contact, contact carrier, link plate, static contact, high resistance connecting piece, wherein specifically:
the driving connecting rod is provided with a square hole, a square shaft is inserted in the square hole, and the square shaft can be in transmission connection with an operating mechanism of the automatic change-over switch;
one end of the lower connecting rod is coupled with the driving connecting rod through a first connecting shaft;
the moving contact is provided with 2 shaft holes;
the contact support is provided with 2 shaft holes corresponding to the upper shaft hole of the moving contact, the 2 shaft holes are connected with the moving contact through a second connecting shaft and a third connecting shaft, the second connecting shaft is connected with the other end of the lower connecting rod, the third connecting shaft is connected to a base of the automatic change-over switch, and the driving connecting rod, the lower connecting rod, the contact support and the base of the automatic change-over switch form a four-connecting-rod structure;
a connection plate electrically connected between the power supply side of the automatic transfer switch and an external circuit;
the static contact is electrically connected between the load side of the automatic change-over switch and an external circuit;
and the high-resistance connecting piece is connected between the connecting plate and the movable contact.
Furthermore, a spring is arranged between the moving contact and the contact support, and the spring is in a compressed state.
Furthermore, a moving contact and a first contact surface are arranged on the moving contact;
a static contact is arranged on the static contact;
the connecting plate is provided with a second contact surface and a third contact surface which are vertical to each other.
Furthermore, clearance fit is formed between the shaft hole in the contact support and the third connecting shaft, and the contact support can rotate around the third connecting shaft.
Furthermore, the aperture of two shaft holes on the moving contact is larger than the aperture of the corresponding hole on the contact support.
Further, the first contact surface is of a downward convex cambered surface structure;
and a fourth contact surface is also arranged on the movable contact, and the fourth contact surface is of a planar structure connected with the first contact surface.
Furthermore, the square shaft can rotate clockwise to drive the moving contact to rotate anticlockwise, so that a closing state is realized;
and in a closing state, the movable contact and the fixed contact are pressed tightly under the action of the spring, and the first contact surface presses the third contact surface tightly.
Furthermore, the square shaft can rotate anticlockwise to drive the moving contact to rotate clockwise, so that the opening state is realized;
and in the switching-off state, the movable contact leaves the fixed contact and generates electric arc, and the fourth contact surface is separated from the third contact surface.
Further, the high-resistance connecting piece is made of a copper stranded wire;
the connection mode among the high-resistance connecting piece, the moving contact and the connecting plate is soft connection or hard connection.
Further, the first contact surface and the fourth contact surface are in transition connection through chamfering or rounding.
The mechanism of the utility model is as follows:
this patent is through adopting two kinds of connections of parallelly connected between moving contact and the connection board, one kind is the connection that resistance is less, one kind is the great connection of resistance, two connections are closed simultaneously when making the moving contact closure, loop resistance is very little, the return circuit generates heat and the consumption is also little, and the less connection disconnection of resistance is only through the great connection series connection moving contact of resistance and connection board when moving contact separates, loop resistance increase this moment, produce the current limiting effect, the connection of the great resistance of series connection also can the partial pressure simultaneously, make the voltage between the moving contact and the fixed contact, the electric current all reduces, realize quick arc extinguishing with this, reduce the harm of the disconnected electric current of switch-on to the change-over switch body.
Compared with the prior art, the utility model discloses following technical advantage has:
the utility model discloses the return circuit that well moving contact and tie plate formed can have two kinds of different resistances under combined floodgate and separating brake state, and resistance during combined floodgate is little, can be used to the load current, and resistance is big during separating brake, can reduce disconnected electric current and can reduce arc voltage and electric current for moving contact partial pressure to this realizes better arc extinguishing effect, reduces the contact and divides the injury that disconnected electric current brought for the switch body.
Drawings
Fig. 1 is a schematic front structural view of a contact structure for an automatic transfer switch according to the present invention;
fig. 2 is a schematic cross-sectional view of a contact structure for an automatic transfer switch according to the present invention;
fig. 3 is a schematic structural diagram of the moving contact in the present technical solution;
fig. 4 is a schematic structural diagram of the contact structure for the automatic transfer switch in the present technical scheme when opening;
fig. 5 is a schematic structural diagram of the contact holder according to the present embodiment;
fig. 6 is a circuit model diagram of a closing state of the contact structure in the technical solution;
fig. 7 is a circuit model diagram of the contact structure in the switching-off state in the present technical solution.
In the figure: 1. the contact device comprises a square shaft, 2, a driving connecting rod, 3, a moving contact, 4, a high-resistance connecting piece unit, 5, a static contact, 6, a connecting plate, 7, a contact support, 8, a spring, 9, a first connecting shaft, 10, a second connecting shaft, 11, a third connecting shaft, 12, a lower connecting rod, 31, a moving contact main body, 32, a moving contact, 33, an installation groove, 34, a first contact surface, 35, a fourth contact surface, 36-37 holes, 38, a contact surface, 51, a static contact, 61, a second contact surface, 62, a third contact surface and 71-72 holes.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments. In the technical scheme, the features such as component model, material name, connection structure, control method, algorithm and the like which are not explicitly described are all regarded as common technical features disclosed in the prior art.
Referring to fig. 1 to 5, the structure of the present invention includes a square shaft 1, a driving connecting rod 2, a moving contact 3, a high resistance connector unit 4, a static contact 5, a connecting plate 6, a contact support 7, a spring 8, a first connecting shaft 9, a second connecting shaft 10, a third connecting shaft 11, and a lower connecting rod 12.
The operating mechanism (not shown) can drive the square shaft 1 to rotate along the central axis thereof, the driving connecting rod 2 is provided with a corresponding square hole, and the square shaft 1 can be inserted into the square hole on the driving connecting rod 2 so as to drive the driving connecting rod 2 to rotate. The holes 71 and 72 of the contact support 7 are correspondingly connected with the holes 36 and 37 of the movable contact 3 through the second connecting shaft 10 and the third connecting shaft 11, wherein the third connecting shaft 11 is a fixed shaft, the third connecting shaft 11 is fixed on a switch base (not shown in the figure), the hole 72 of the contact support 7 is in clearance fit with the third connecting shaft 11, and the contact support 7 can freely rotate by taking the third connecting shaft 11 as a circle center.
The hole diameters of the holes 36 and 37 on the moving contact main body 31 are respectively larger than the holes 72 and 71 on the contact support, and the spring 8 is installed between the installation groove 33 of the moving contact 3 and the contact support 11 and is in a compressed state after being assembled. Two ends of the lower connecting rod 12 are respectively connected with the contact support 7, the moving contact 3 and the driving connecting rod 2 through a first connecting shaft 9 and a second connecting shaft 10. The high-resistance connecting element 4 is connected to the second contact surface 61 of the connecting plate 6 and the contact surface 38 of the moving contact respectively, the material of the high-resistance connecting element 4 may be copper stranded wire or other conductive material, and the connection mode between the high-resistance connecting element 4 and the moving contact 3 and the connecting plate 6 may be flexible soft connection or hard connection.
The driving connecting rod 2, the lower connecting rod 12, the contact support 7 and the switch base form a four-bar structure. The square shaft 1 rotates clockwise to drive the moving contact 3 to rotate anticlockwise and switch on, after the switch on, the contact 32 of the moving contact 3 is pressed against the fixed contact 51 under the action of the spring 8, and the first contact surface 34 on the moving contact 3 is also pressed against the third contact surface 62 on the connecting plate 6 to form hard connection with lower resistance; the connection plate 6 serves as a connection for the power supply side of the diverter switch to an external circuit, and the stationary contact 5 serves as a connection for the load side to an external circuit.
When the loop at the side is in a closing state as shown in fig. 6, the resistance of the loop is the contact resistance R between the moving contact and the static contact, andresistance R of high resistance connector 4 1 A hard connection resistance R formed with the first contact surface 34 and the third contact surface 62 2 Parallel resistors connected in series, as shown in FIG. 6, due to the contact R and the contact R 2 The resistance value of the switch is smaller, the loop resistance at the position is also smaller, and the change-over switch can well bear rated working current.
When the current is cut off, the square shaft rotates anticlockwise, the movable contact 3 rotates clockwise, the movable contact 32 leaves the fixed contact 51 and generates electric arc, the fourth contact surface 35 on the movable contact is also separated from the connecting plate 6, the state of a loop can be regarded as the state of figure 7 at the moment, the electric arc is connected with the high-resistance connecting piece 4 in series, and the resistance R of the high-resistance connecting piece 4 is caused by the fact that the electric arc is connected with the high-resistance connecting piece 4 in series 1 The loop resistance under the condition of breaking current is larger than that under the condition of closing, so that the current is reduced, and the recovery voltage of two ends of arc is reduced by R 1 The voltage is divided and reduced, the electric arc is extinguished very quickly, and thus the switch body is protected.
In order to enable the movable contact 3 to smoothly rotate from the open state to the closed state, a chamfer or a radius is formed between the first contact surface 34 and the fourth contact surface 35 on the movable contact.
In the embodiment, the moving contact and the connecting plate are connected through the surface 34 and the surface 35, and other methods capable of contacting the moving contact 3 with the connecting plate 6 during closing and disconnecting the moving contact 3 from the connecting plate 6 during opening are also within the protection range.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims (10)

1. A contact structure for an automatic transfer switch, comprising:
the driving connecting rod (2) is provided with a square hole, a square shaft (1) is inserted into the square hole, and the square shaft (1) can be in transmission connection with an operating mechanism of the automatic change-over switch;
a lower connecting rod (12), one end of which is coupled with the driving connecting rod (2) through a first connecting shaft (9);
the moving contact (3) is provided with 2 shaft holes;
the contact support (7) is provided with 2 shaft holes corresponding to the shaft holes in the moving contact (3), the moving contact (3) is connected with the shaft holes in the 2 shaft holes through a second connecting shaft (10) and a third connecting shaft (11), the second connecting shaft (10) is connected with the other end of the lower connecting rod (12), the third connecting shaft (11) is connected to a base of the automatic change-over switch, and the driving connecting rod (2), the lower connecting rod (12), the contact support (7) and the base of the automatic change-over switch form a four-bar structure;
a connection plate (6) electrically connected between the power supply side of the automatic transfer switch and an external circuit;
a static contact (5) electrically connected between the load side of the automatic transfer switch and an external circuit;
and the high-resistance connecting piece (4) is connected between the connecting plate (6) and the moving contact (3).
2. A contact structure for automatic transfer switches according to claim 1, characterized in that a spring (8) is provided between the moving contact (3) and the contact support (7), said spring (8) being in a compressed state.
3. A contact structure for automatic transfer switches according to claim 1, characterized in that said movable contact (3) is provided with a movable contact (32) and a first contact surface (34);
a static contact (51) is arranged on the static contact (5);
the connecting plate (6) is provided with a second contact surface (61) and a third contact surface (62) which are perpendicular to each other.
4. A contact arrangement for an automatic transfer switch according to claim 1, characterized in that the shaft hole of the contact carrier (7) forms a clearance fit with the third connecting shaft (11), the contact carrier (7) being rotatable about the third connecting shaft (11).
5. A contact structure for automatic transfer switches according to claim 1, characterized in that the two axial holes of the moving contact (3) have a larger diameter than the corresponding holes of the contact support (7).
6. A contact arrangement for an automatic transfer switch according to claim 3, characterized in that said first contact surface (34) is a downwardly convex arc-shaped structure;
the moving contact (3) is further provided with a fourth contact surface (35), and the fourth contact surface (35) is of a plane structure connected with the first contact surface (34).
7. The contact structure for the automatic transfer switch according to claim 3, wherein the square shaft (1) can rotate clockwise to drive the moving contact (3) to rotate anticlockwise, so as to realize a closing state;
in a closing state, the movable contact (32) and the fixed contact (51) are pressed under the action of the spring (8), and the first contact surface (34) presses the third contact surface (62).
8. The contact structure for the automatic transfer switch according to claim 6, wherein the square shaft (1) can rotate counterclockwise to drive the moving contact (3) to rotate clockwise, so as to realize an open state;
in the opening state, the movable contact (32) leaves the fixed contact (51) and generates an arc, and the fourth contact surface (35) is separated from the third contact surface (62).
9. A contact structure for automatic transfer switches according to claim 1, characterized in that the material of the high-resistance connecting piece (4) is copper stranded wire;
the connection mode among the high-resistance connecting piece (4), the moving contact (3) and the connecting plate (6) is flexible connection or hard connection.
10. A contact arrangement for an automatic transfer switch according to claim 6, characterized in that the first contact surface (34) and the fourth contact surface (35) are connected by a chamfer or rounded transition.
CN202220525849.0U 2022-03-11 2022-03-11 Contact structure for automatic change-over switch Active CN217386916U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220525849.0U CN217386916U (en) 2022-03-11 2022-03-11 Contact structure for automatic change-over switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220525849.0U CN217386916U (en) 2022-03-11 2022-03-11 Contact structure for automatic change-over switch

Publications (1)

Publication Number Publication Date
CN217386916U true CN217386916U (en) 2022-09-06

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ID=83103005

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202220525849.0U Active CN217386916U (en) 2022-03-11 2022-03-11 Contact structure for automatic change-over switch

Country Status (1)

Country Link
CN (1) CN217386916U (en)

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