CN218769179U - Contact mechanism for automatic change-over switch - Google Patents
Contact mechanism for automatic change-over switch Download PDFInfo
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- CN218769179U CN218769179U CN202223089165.XU CN202223089165U CN218769179U CN 218769179 U CN218769179 U CN 218769179U CN 202223089165 U CN202223089165 U CN 202223089165U CN 218769179 U CN218769179 U CN 218769179U
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- contact
- rotating shaft
- static contact
- moving
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Abstract
The utility model discloses a contact mechanism for an automatic change-over switch, which comprises a moving contact component, a rotating shaft and a moving contact, wherein the moving contact comprises a first contact end, a second contact end and a third contact end; the fixed contact assembly comprises a common contact, a standby contact and a load contact, the common contact and the standby contact are arranged on one side of the rotating shaft, an isolation plate is arranged between the common contact and the standby contact, the load contact is arranged on the other side of the rotating shaft, the movable contact assembly is driven by the rotating shaft, the first contact end moves between the common contact and the load contact, the third contact end moves between the load contact and the standby contact, and the load contact comprises a transition part which is overlapped with the moving path of the second contact end. Through the second contact end that sets up with load static contact all the time, guarantee to divide in the double, close commonly, under the condition that reserve closes, all can guarantee that the moving contact subassembly contacts with load static contact all the time, avoid the production of electric arc between moving contact and the load static contact, burn the load static contact.
Description
Technical Field
The utility model particularly relates to a contact mechanism for automatic transfer switch.
Background
The dual-power switch is used for avoiding a fault power supply from supplying power to a load when a main power supply fails in a power supply system, and can reliably select a qualified power supply to be put into normal operation so as to ensure that the power supply is uninterrupted. When the contact structure opens a circuit in the atmosphere, as long as the voltage exceeds 12-20V, the cut-off current exceeds 0.25-1A, an electric arc is usually generated in a contact gap (also called an arc gap) to keep the current on, the contact is not cut off until the electric arc is extinguished, the contact gap becomes insulating medium current, the contact is burnt by the high temperature of the electric arc, and copper ions are left on the surface of the contact after the electric arc is extinguished.
For example, chinese patent 201910069232.5 discloses a professional dual power supply automatic transfer switch electrical appliance, which specifically discloses a switch electrical appliance including a moving contact and a static contact, wherein the static contact includes two contact pieces, and the moving contact is V-shaped, but because the static contact has a large range, the moving contact and the static contact have a wide contact area when the circuit is switched on and off, and the generated electric arc can burn the surface of the whole static contact, so that copper ions are distributed at multiple places of the static contact, which causes interference to switching on and off of the moving contact and the static contact, and in severe cases, the moving contact and the static contact can not be switched on in place, which causes poor contact of the switch, has a potential safety hazard, and the two moving contacts are V-shaped, which can cause an excessively small opening distance and is not beneficial to arc extinguishing.
SUMMERY OF THE UTILITY MODEL
To the deficiency that prior art exists, the utility model aims to provide a contact mechanism for automatic transfer switch.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a contact mechanism for an automatic transfer switch, comprising:
the moving contact component comprises a rotating shaft which is rotatably arranged on the switch shell and a moving contact which is arranged on the rotating shaft in a linkage manner, the moving contact comprises a first contact end, a second contact end and a third contact end, the first contact end, the second contact end and the third contact end extend to the outer side from the side wall of the rotating shaft, and the three contact ends are arranged in a T shape;
the static contact assembly comprises a common static contact, a standby static contact and a load static contact which are arranged along the circumferential direction of the rotating shaft at intervals, the common static contact and the standby static contact are arranged on one side of the rotating shaft, an isolation plate is arranged between the common static contact and the standby static contact, the load static contact is arranged on the other side of the rotating shaft, the movable contact assembly is driven by the rotating shaft, the first contact end moves between the common static contact and the load static contact, the third contact end moves between the load static contact and the standby static contact, and the load static contact comprises a transition part which is overlapped with the moving path of the second contact end.
The front side of the common static contact is provided with a plurality of arc-extinguishing grid plates along the moving path of the first contact end, and the front side of the standby static contact is provided with a plurality of arc-extinguishing grid plates along the moving path of the third contact end.
And an arc striking angle is arranged on the first arc extinguishing grid sheet close to the common static contact and/or the standby static contact.
The outer wall of the rotating shaft is provided with a reinforcing rib which forms limiting fit with the isolation plate.
The transition part of the load static contact is arc-shaped and is arranged concentrically with the rotating shaft.
The rotating shaft comprises an upper rotating shaft and a lower rotating shaft, three mounting grooves are circumferentially formed in the side walls of the upper rotating shaft and the lower rotating shaft, the moving contact is arranged in a cavity formed by combining the upper rotating shaft and the lower rotating shaft, and the first contact end, the second contact end and the third contact end respectively extend to the outer side of the rotating shaft from the mounting grooves.
The moving contact component comprises two moving contacts which are arranged in parallel, and a limiting mechanism used for keeping the relative positions of the two moving contacts stable is arranged between the two moving contacts.
A spring is arranged between the two moving contacts and the upper and lower rotating shafts.
The parts of the first contact end, the second contact end and the third contact end, which are matched with the upper rotating shaft and the lower rotating shaft, are provided with springs.
The surface of the movable contact is provided with a positioning column, the upper rotating shaft and the lower rotating shaft are correspondingly provided with positioning grooves, and two ends of the spring are limited by the positioning column and the positioning grooves respectively.
The utility model has the advantages that: the second contact end which is always in contact with the load static contact can ensure that the moving contact component is always in contact with the load static contact under the conditions of double separation, common combination and standby combination, so that the generation of electric arcs between the moving contact and the load static contact is avoided, and the load static contact is prevented from being burnt.
Drawings
Fig. 1 is a schematic structural diagram of the common joint of the present invention.
Fig. 2 is a schematic diagram of the double-split structure of the present invention.
Fig. 3 is a schematic structural view of the standby device of the present invention.
Fig. 4 is an explosion diagram of the movable contact assembly of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
As shown in the figure, the utility model discloses a contact mechanism for automatic transfer switch, it includes:
the moving contact component comprises a rotating shaft 4 which is rotatably arranged on the switch shell and a moving contact 7 which is arranged on the rotating shaft in a linkage manner, the moving contact comprises a first contact end 71, a second contact end 72 and a third contact end 73 which extend to the outer side from the side wall of the rotating shaft, and the three contact ends are arranged in a T shape;
the static contact assembly comprises a common static contact 1, a standby static contact 3 and a load static contact 2 which are arranged along the circumferential direction of a rotating shaft at intervals, the common static contact and the standby static contact are arranged on one side of the rotating shaft, an isolating plate 5 is arranged between the common static contact and the standby static contact, the load static contact is arranged on the other side of the rotating shaft, the moving contact assembly is driven by the rotating shaft, the first contact end moves between the common static contact and the load static contact, the third contact end moves between the load static contact and the standby static contact, and the load static contact comprises a transition part which is overlapped with the moving path of the second contact end.
The common static contact, the load static contact and the standby static contact are arranged on the switch shell at intervals along the circumferential direction of the rotating shaft, the common static contact and the standby static contact are arranged on one side of the rotating shaft, the load static contact is arranged on the other side of the rotating shaft, and the common static contact and the standby static contact are distributed in two symmetrical spaces, wherein the load static contact is provided with an arc-shaped transition portion, and the transition portion and the rotating shaft are arranged concentrically. The moving contact is designed in an approximate T shape, a first contact end and a third contact end are arranged approximately in parallel, a second contact end is arranged approximately perpendicular to the first contact end and the third contact end, the moving distance of the first contact end is the arc length from a common static contact to a load moving contact, the moving distance of the third contact end is the arc length from a standby static contact to the load moving contact, the moving distance of the second contact end is the arc length of a transition part, the first contact end is in closing contact with the common static contact under the driving of a rotating shaft, the third contact end is in opening contact with the standby static contact or the first contact end is in opening contact with the common static contact, and the third contact end is in closing contact with the standby static contact, so that the switching between a main power supply and a standby power supply is realized, and in the switching process, the second contact end is always in contact with the load static contact.
And a plurality of arc-extinguishing grid plates 6 are arranged on the front side of the common static contact along the moving path of the first contact end, a plurality of arc-extinguishing grid plates are arranged on the front side of the standby static contact along the moving path of the third contact end, and an arc striking angle 61 is arranged on the first arc-extinguishing grid plate close to the common static contact and/or the standby static contact. When the rotating shaft drives the first contact end to be disconnected with the common static contact, the arc striking angle on the arc extinguishing grid plate with the arc striking guides the arc to enter the arc extinguishing grid plate to be extinguished, and when the rotating shaft drives the third contact end to be disconnected with the standby static contact, the arc striking angle on the arc extinguishing grid plate with the arc striking guides the arc to enter the arc extinguishing grid plate to be extinguished.
In order to facilitate the closing of the contact end and the static contact, the front side of the part of the static contact matched with the contact end is provided with an inclined plane, so that the static contact can be better matched with the contact end.
The outer wall of the rotating shaft is provided with two groups of reinforcing ribs 41 which form limit matching with the isolating plate and are respectively arranged between the first contact end and the isolating plate and between the third contact end and the isolating plate. When the rotating shaft rotates and the first contact end is in contact with the common static contact, the reinforcing rib and one surface of the isolation plate form a limit fit, similarly, when the third contact end is in contact with the standby static contact, the other reinforcing rib and the other surface of the isolation plate form a limit fit to prevent transition switching-on, and the isolation plate can be directly integrated into the switch shell and can also be fixed in a clamping fit mode.
The rotating shaft comprises an upper rotating shaft 42 and a lower rotating shaft 43, three mounting grooves 431 are circumferentially formed in the side walls of the upper rotating shaft and the lower rotating shaft, the moving contact is arranged in a cavity formed by combining the upper rotating shaft and the lower rotating shaft, the first contact end, the second contact end and the third contact end extend to the outer side of the rotating shaft through the mounting grooves respectively, the upper rotating shaft and the lower rotating shaft are fixed through screws to form a cavity inside, the side wall has a structure with through grooves formed by combining the mounting grooves, the moving contact is arranged in the cavity, and the three contact ends extend out of the through grooves respectively and are arranged outside the rotating shaft.
The moving contact component comprises two moving contacts 7 arranged in parallel, a limiting mechanism 8 used for keeping the relative positions of the two moving contacts stable is arranged between the two moving contacts, the limiting mechanism is a limiting iron sheet, the thickness of the limiting iron sheet is matched with that of the static contact, a space matched with the static contact is formed between the other moving contacts, and when the two moving contacts are switched on and off, the static contact is partially arranged in the space and is contacted with the inner sides of the two moving contacts.
And a spring is arranged between the two moving contacts and the upper and lower rotating shafts, and the spring is used for giving opposite pressing force to the moving contacts.
The parts of the first contact end, the second contact end and the third contact end, which are matched with the upper rotating shaft and the lower rotating shaft, are provided with springs.
The surface of the movable contact is provided with a positioning column 74, the upper rotating shaft and the lower rotating shaft are correspondingly provided with positioning grooves 432, two ends of the spring are respectively limited by the positioning column and the positioning grooves, and the positioning column and the positioning grooves are matched with each other, so that the spring is limited and is not easy to deflect and deform.
Three groups of springs are adopted, so that the pressure is stable all the time, and the problem that different final pressures can exist due to different forming angles or heights of the adopted spring piece structure is solved.
The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of the present invention.
Claims (10)
1. A contact mechanism for an automatic transfer switch, characterized by: it includes:
the moving contact component comprises a rotating shaft which is rotatably arranged on the switch shell and a moving contact which is arranged on the rotating shaft in a linkage manner, the moving contact comprises a first contact end, a second contact end and a third contact end, the first contact end, the second contact end and the third contact end extend to the outer side from the side wall of the rotating shaft, and the three contact ends are arranged in a T shape;
the static contact assembly comprises a common static contact, a standby static contact and a load static contact which are arranged at intervals along the circumferential direction of the rotating shaft, the common static contact and the standby static contact are arranged on one side of the rotating shaft, a partition plate is arranged between the common static contact and the standby static contact, the load static contact is arranged on the other side of the rotating shaft, the first contact end moves between the common static contact and the load static contact under the driving of the rotating shaft, the third contact end moves between the load static contact and the standby static contact, and the load static contact comprises a transition part which is overlapped with the moving path of the second contact end.
2. A contact mechanism for an automatic transfer switch according to claim 1, characterized in that: the front side of the common static contact is provided with a plurality of arc-extinguishing grid plates along the moving path of the first contact end, and the front side of the standby static contact is provided with a plurality of arc-extinguishing grid plates along the moving path of the third contact end.
3. A contact mechanism for an automatic transfer switch according to claim 2, characterized in that: and an arc striking angle is arranged on the first arc extinguishing grid sheet close to the common static contact and/or the standby static contact.
4. A contact mechanism for an automatic transfer switch according to claim 1, characterized in that: the outer wall of the rotating shaft is provided with a reinforcing rib which forms limiting fit with the isolation plate.
5. A contact mechanism for an automatic transfer switch according to claim 1, characterized in that: the transition part of the load static contact is arc-shaped and is arranged concentrically with the rotating shaft.
6. A contact mechanism for an automatic transfer switch according to claim 1, characterized in that: the rotating shaft comprises an upper rotating shaft and a lower rotating shaft, three mounting grooves are formed in the circumferential direction of the side walls of the upper rotating shaft and the lower rotating shaft, the moving contact is arranged in a cavity formed by the combination of the upper rotating shaft and the lower rotating shaft, and the first contact end, the second contact end and the third contact end extend to the outer side of the rotating shaft from the mounting grooves respectively.
7. A contact arrangement for an automatic transfer switch according to claim 1 or 6, characterized in that: the moving contact component comprises two moving contacts arranged in parallel, and a limiting mechanism used for keeping the relative position of the two moving contacts stable is arranged between the two moving contacts.
8. A contact mechanism for an automatic transfer switch according to claim 7, wherein: a spring is arranged between the two moving contacts and the upper and lower rotating shafts.
9. A contact mechanism for an automatic transfer switch according to claim 8, wherein: the parts of the first contact end, the second contact end and the third contact end, which are matched with the upper rotating shaft and the lower rotating shaft, are provided with springs.
10. A contact mechanism for an automatic transfer switch according to claim 8, wherein: the surface of the movable contact is provided with a positioning column, the upper rotating shaft and the lower rotating shaft are correspondingly provided with positioning grooves, and two ends of the spring are limited by the positioning column and the positioning grooves respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223089165.XU CN218769179U (en) | 2022-11-17 | 2022-11-17 | Contact mechanism for automatic change-over switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223089165.XU CN218769179U (en) | 2022-11-17 | 2022-11-17 | Contact mechanism for automatic change-over switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218769179U true CN218769179U (en) | 2023-03-28 |
Family
ID=85650549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223089165.XU Active CN218769179U (en) | 2022-11-17 | 2022-11-17 | Contact mechanism for automatic change-over switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218769179U (en) |
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2022
- 2022-11-17 CN CN202223089165.XU patent/CN218769179U/en active Active
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