CN112164621B - Composite electric contact - Google Patents
Composite electric contact Download PDFInfo
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- CN112164621B CN112164621B CN202011049153.7A CN202011049153A CN112164621B CN 112164621 B CN112164621 B CN 112164621B CN 202011049153 A CN202011049153 A CN 202011049153A CN 112164621 B CN112164621 B CN 112164621B
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- contact
- cup seat
- cup
- tail
- electrical contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
Abstract
The invention relates to a composite electrical contact, which belongs to the technical field of power switch equipment; the composite type electric contact comprises a contact blade, at least one middle-arranged cup seat and a tail-arranged cup seat which are sequentially arranged, wherein elastic supporting structures are arranged in inner cavities of the middle-arranged cup seat and the tail-arranged cup seat respectively, each elastic supporting structure comprises a positioning backing ring, the positioning backing rings sequentially penetrate through a disc-shaped gasket and a supporting backing ring, the supporting backing rings are arranged on the lower surfaces of the contact blade and the middle-arranged cup seat, the positioning backing rings are arranged on the upper surfaces of the middle-arranged cup seat and the tail-arranged cup seat, and a stop gap is reserved between the upper surface of the positioning backing ring and the lower surfaces of the contact blade and the middle-arranged cup seat; the impact force of the contact when the quick switch is switched on can be absorbed through the buffer effect, and the switch-on bounce of the contact is eliminated.
Description
Technical Field
The invention relates to a composite electrical contact, and belongs to the technical field of power switch equipment.
Background
When a vacuum switch, particularly a medium-high voltage quick switch, is switched on, because a contact of a traditional vacuum arc-extinguishing chamber is in rigid plane contact, a moving contact can rebound for many times after impacting a static contact, the rebound quantity is gradually attenuated, finally the contact is completely closed, the process is called contact bounce, and the time from the contact of the contact to the complete closing is called contact switching bounce time. The fatigue life of the corrugated pipe is greatly shortened due to the bounce amplitude, the vacuum life of the vacuum arc-extinguishing chamber is further shortened rapidly, electric arc heat between contacts is accumulated due to the long bounce time, the burning loss of the surfaces of the contacts is increased, the fusion welding of the contacts is more easily caused, and the service life of the contacts and various performance parameters of the vacuum arc-extinguishing chamber are seriously influenced. In vacuum switches with the same voltage class, the closing speed of a quick switch is particularly high and is 3-4 times that of a common switch, and the problem of contact bounce is particularly serious.
At present, several improvement schemes based on the traditional vacuum arc-extinguishing chamber contact structure enable the contact to have micro plastic deformation or elastic deformation so as to absorb part of impact force and reduce bounce. However, these solutions have not been effective at the high closing speed of the fast switch.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcome prior art's not enough, provide a compound electrical contact, can absorb the impact of contact when falling the fast switch combined floodgate through the cushioning effect, eliminate contact combined floodgate bounce.
The invention discloses a composite type electric contact, which comprises a contact blade, at least one middle-arranged cup seat and a tail-arranged cup seat which are sequentially arranged, wherein elastic supporting structures are arranged in inner cavities of the middle-arranged cup seat and the tail-arranged cup seat respectively, each elastic supporting structure comprises a positioning backing ring, each positioning backing ring sequentially penetrates through a disc-shaped gasket and a supporting gasket, each supporting gasket is arranged on the lower surfaces of the contact blade and the middle-arranged cup seat, each positioning backing ring is arranged on the upper surfaces of the middle-arranged cup seat and the tail-arranged cup seat, and a stop gap is reserved between the upper surface of each positioning backing ring and the lower surfaces of the contact blade and the middle-arranged cup seat.
The disc-shaped gasket in the elastic supporting structure is compressed to generate rebound force opposite to the movement direction, so that the impact force of the contact when the quick switch is switched on is absorbed, and the switching-on bounce of the contact is eliminated. The existence of the stop clearance ensures that the plastic deformation of the middle-arranged cup seat and the tail-arranged cup seat is controllable, when the stop clearance in one inner cavity is reduced to 0, the plastic deformation is not generated, and the middle-arranged cup seat or the tail-arranged cup seat with insufficient deformation continuously deforms to buffer until the middle-arranged cup seat or the tail-arranged cup seat stops. The elastic deformation capability of the composite type electrical contact is greatly improved, the impact force of the contact during the closing of the rapid switch can be absorbed through the buffer action, and the closing bounce of the contact is eliminated.
During the closing period of the vacuum switch, all disc-shaped gaskets in the composite electrical contact are in a compressed state, and the generated rebound force and the closing holding force applied by the vacuum switch are in a balanced state. When the vacuum switch is opened, the closing holding force is cancelled, and the middle cup seat and the tail cup seat of the composite electrical contact recover to the initial state under the action of the rebound force of the disc-shaped gasket. The reasonable arrangement can balance the buffering and decelerating effect of the related part of the elastic support and the fatigue life of the related part of the deformable conductive loop.
Preferably, the contact blade, the at least one middle cup holder and the tail cup holder are welded in sequence, and the positioning backing ring, the disc-shaped washer and the support gasket have movable gaps.
So that the disc-shaped gasket in the elastic supporting structure is compressed to generate rebound force opposite to the movement direction.
Preferably, the stop gap is less than 0.5mm.
Further ensuring the controllable plastic deformation of the middle cup holder and the tail cup holder.
Preferably, the support gasket is made of a high temperature resistant hard alloy.
Ensuring that the support washer maintains sufficient hardness after being subjected to the high temperature of brazing to provide the necessary conditions for the disc washer to elastically deform.
Preferably, the positioning backing ring is made of high temperature resistant hard alloy.
The positioning backing ring is ensured to maintain enough hardness after being subjected to high temperature of brazing, and necessary conditions required when the disc-shaped gasket is elastically deformed are provided.
Preferably, the belleville washer is made of a high temperature resistant elastomeric alloy.
Ensuring that the disc washer maintains sufficient elasticity after being subjected to the high temperature of brazing.
Preferably, the wall of the middle cup holder is provided with a middle chute.
The cup wall parts on two sides of the middle-placed chute are provided with deformable spaces, the cup wall can generate plastic deformation, and further the impact force of the contact when the quick switch is switched on is absorbed through the buffer effect, so that the switching-on bounce of the contact is eliminated.
Preferably, the cup wall of the tail cup holder is provided with a tail chute.
The cup wall parts on the two sides of the tail inclined groove are provided with deformable spaces, the cup wall can generate plastic deformation, and further the impact force of the contact when the quick switch is switched on is absorbed through the buffer effect, so that the switching-on bounce of the contact is eliminated.
The invention also discloses a dynamic-static end composite type electric contact, which comprises a dynamic-static end composite type electric contact and a dynamic-static end composite type electric contact, wherein the dynamic-static end composite type electric contact and the dynamic-static end composite type electric contact both adopt the composite type electric contact.
Compared with the prior art, the invention has the following beneficial effects:
the composite electric contact disclosed by the invention has the advantages that the elastic deformation capacity is greatly improved, the impact force of the contact during the closing of the quick switch can be absorbed through the buffer action, and the closing bounce of the contact is eliminated.
According to the composite type electric contact with the moving end and the static end, the elastic deformation capacity is greatly improved, the impact force of the contact during the closing of the quick switch can be absorbed through the buffer action, and the closing bounce of the contact is eliminated.
Drawings
FIG. 1 is a schematic view of a composite electrical contact according to the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
fig. 3 is a cross-sectional view showing the contact blade 1 at the instant of contact and after static when the vacuum interrupter is switched on in the composite electric contact with the moving and static ends according to embodiment 1 of the present invention;
fig. 4 is a schematic structural view of the hybrid electrical contact for moving and stationary ends according to embodiment 2 of the present invention;
fig. 5 is a cross-sectional view showing the contact blade 1 at the instant of contact and after static when the vacuum interrupter is switched on in the composite electric contact with the moving and static ends according to embodiment 1 of the present invention.
Wherein: 1. a contact blade; 2. a support pad; 3. a disc-shaped washer; 4. positioning a backing ring; 5. a middle cup seat; 6. the tail is provided with a cup seat; 7. a stop gap; 8. a middle chute; 9. the tail is provided with a chute.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1-3, the composite electrical contact includes a contact blade 1, at least one middle-placed cup holder 5, and a tail-placed cup holder 6, which are arranged in sequence, wherein the inner cavities of the middle-placed cup holder 5 and the tail-placed cup holder 6 are both provided with an elastic supporting structure, the elastic supporting structure includes a positioning backing ring 4, the positioning backing ring 4 sequentially penetrates through a disc-shaped gasket 3 and a supporting gasket 2, the supporting gasket 2 is arranged on the lower surfaces of the contact blade 1 and the middle-placed cup holder 5, the positioning backing ring 4 is arranged on the upper surfaces of the middle-placed cup holder 5 and the tail-placed cup holder 6, and a stop gap 7 is left between the upper surface of the positioning backing ring 4 and the lower surfaces of the middle-placed cup holder 1 and the cup holder 5.
The disc-shaped gasket 3 in the elastic supporting structure is compressed to generate rebound force opposite to the movement direction, so that the impact force of the contact when the quick switch is switched on is absorbed, and the switching-on bounce of the contact is eliminated. The existence of the stop gap 7 ensures that the plastic deformation of the middle cup holder 5 and the tail cup holder 6 is controllable, when the stop gap 7 in one inner cavity is reduced to 0, the plastic deformation is not generated, and the middle cup holder 5 or the tail cup holder 6 with other insufficient deformation continuously deforms to buffer until the stop. The elastic deformation capability of the composite type electrical contact is greatly improved, and the impact force of the contact when the rapid switch is switched on can be absorbed through the buffer effect, so that the switching-on bounce of the contact is eliminated.
The contact blade 1, at least one middle cup holder 5 and a tail cup holder 6 are welded in sequence, and a movable gap is reserved among the positioning backing ring 4, the disc-shaped gasket 3 and the supporting gasket 2.
So that the belleville washers 3 in the resilient support structure are compressed to produce a recoil force opposite to the direction of movement.
Wherein the stop gap 7 is smaller than 0.5mm.
Further ensuring the controllable plastic deformation of the middle cup holder 5 and the tail cup holder 6.
Wherein the support gasket 2 is made of a high temperature resistant hard alloy.
Ensuring that the support washer 2 maintains sufficient hardness after the high temperatures of brazing to provide the necessary conditions for the disc washer 3 to elastically deform.
Wherein, the positioning backing ring 4 is made of high temperature resistant hardness alloy.
It is ensured that the positioning backing ring 4 maintains sufficient hardness after the high temperature of brazing, providing the necessary conditions for the elastic deformation of the disc washer 3.
Wherein the disc-shaped gasket 3 is made of a high temperature resistant elastic alloy.
Ensuring that the belleville washers 3 maintain sufficient resilience after the high temperatures of brazing.
Wherein, the cup wall of the middle cup seat 5 is provided with a middle chute 8.
The cup wall parts on the two sides of the middle-placed chute 8 are provided with deformable spaces, the cup wall can generate plastic deformation, and further the impact force of the contact during the closing of the rapid switch is absorbed through the buffer effect, so that the closing bounce of the contact is eliminated.
Wherein, the cup wall of the tail cup holder 6 is provided with a tail chute 9.
The cup wall parts on the two sides of the tail chute 9 are provided with deformable spaces, the cup wall can generate plastic deformation, and further the impact force of the contact during the closing of the fast switch is absorbed through the buffer action, so that the closing bounce of the contact is eliminated.
The composite electric contact comprises a movable end composite electric contact and a static end composite electric contact when being applied to a movable end and a static end of a vacuum arc extinguish chamber, wherein the movable end composite electric contact and the static end composite electric contact both adopt the composite electric contact.
The working principle of the composite electric contact is as follows:
when the rapid switch is switched on, the movable-end composite type electric contact of the vacuum arc extinguish chamber moves at a high speed, the contact piece 1 of the movable-end composite type electric contact instantly contacts and compresses the relevant parts of the deformable conductive loop, the cup walls of the middle cup seat 5 and the tail cup seat 6 are provided with a middle inclined groove 8 and a tail inclined groove 9, the cup wall parts on the two sides of the inclined grooves are provided with deformable spaces, and the cup walls start to plastically deform. Meanwhile, the disc-shaped gasket 3 in the elastic supporting structure is compressed to generate rebound force opposite to the movement direction, so that the impact force of the contact when the quick switch is switched on is absorbed, and the switching-on bounce of the contact is eliminated. The existence of the stop gap 7 ensures that the plastic deformation of the middle cup holder 5 and the tail cup holder 6 is controllable, when the stop gap 7 in one inner cavity is reduced to 0, the plastic deformation is not generated, and the middle cup holder 5 or the tail cup holder 6 with insufficient deformation continuously deforms to buffer until stopping. During the closing period of the vacuum switch, all disc-shaped gaskets 3 in the composite type electrical contact are in a compressed state, and the generated rebound force and the closing holding force applied by the vacuum switch are in a balanced state. When the vacuum switch is opened, the closing holding force is cancelled, and the middle cup seat 5 and the tail cup seat 6 of the composite electrical contact recover to the initial state under the action of the rebound force of the disc-shaped gasket 3. The reasonable arrangement can balance the buffering and decelerating effect of the elastic supporting structure and the fatigue life of the related part of the deformable conductive loop.
In this embodiment, the movable-end composite electrical contact and the stationary-end composite electrical contact are configured in the same manner, the number of the contact blades 1 and the number of the tail cup holders 6 are 1, the number of the middle cup holders 5 is 4, and the supporting gasket 2, the disc-shaped gasket 3, the positioning backing ring 4 and the locking gap 7 are respectively 1 in each of the middle cup holder 5 and the tail cup holder 6.
In the embodiment, the closing speed v =2m/s of the quick switch, the contact pressure f =4000N, and the mass of the moving part of the vacuum arc extinguish chamber is m =1kg. Calculating a =4000m/s from the acceleration formula f = ma 2 . The deceleration stroke of the contact blade 1 after contact, namely the deformation quantity S = v of the relevant part of the deformable conductive loop in the composite electric contact 2 /(2 a), calculated as S =0.5mm. The comparison between the instant contact and the static contact blade 1 of the composite electric contact when the vacuum arc-extinguishing chamber is switched on is shown in figure 3. The dynamic-end composite type electrical contact and the static-end composite type electrical contact adopt a structure of 8 middle cup seats and 2 tail cup seats, 10 cup seats are connected in series, and the average plastic deformation of each cup seat is L =0.5/10=0.05mm.
Substituting into a Manson-coffee formula to calculate the fatigue life:
Δεp·N α ＝D。
in the above formula, D is the material static fracture toughness, Δ ε p is the plastic strain amplitude, α is the fatigue ductility index, and N is the fatigue life.
The material of the middle cup holder 5 and the material of the tail cup holder 6 are oxygen-free copper and are brazed at high temperature, so the static fracture toughness D of the material is the numerical value after annealing, and D =0.957.
The cup wall height of the middle cup holder 5 and the tail cup holder 6 is 10mm, and the simplified calculation result is that delta epsilon p =0.05/10=0.005.
The oxygen-free copper fatigue ductility index is taken as α =0.55.
Calculating to obtain the fatigue life N =14000 times of the middle cup holder 5 and the tail cup holder 6, thereby achieving the mechanical life requirement of 10000 times of vacuum switches.
In conclusion, the elastic deformation capacity of the composite type electrical contact is greatly improved, and the impact force of the contact when the rapid switch is switched on can be absorbed through the buffer action, so that the switching-on bounce of the contact is eliminated. The elastic deformation capacity of the dynamic and static end composite type electric contact is greatly improved, and the impact force of the contact during the closing of the quick switch can be absorbed through the buffer action, so that the closing bounce of the contact is eliminated.
Example 2
The difference from example 1 is:
as shown in fig. 4-5, in order to reduce the mass of the moving part of the vacuum interrupter to reduce the kinetic energy, the moving-end composite type electrical contact and the static-end composite type electrical contact adopt different configurations. Specifically, the number of the contact blade 1, the middle cup holder 5 and the tail cup holder 6 of the movable-end composite electrical contact is 1; the contact blade 1 and the tail cup holder 6 of the static-end composite electrical contact are both 1, and the number of the middle cup holders 5 is 2. Each of the centrally-arranged cup seat 5 and the rear-arranged cup seat 6 is internally provided with 1 each of a supporting gasket 2, a disc-shaped gasket 3, a positioning backing ring 4 and a stopping gap 7.
In the embodiment, the closing speed v =1.6m/s of the fast switch, the contact pressure f =2500N, and the mass of the moving part of the vacuum arc-extinguishing chamber is m =0.5kg. Calculating the acceleration formula f = ma to obtain a =5000m/s 2 . The deceleration stroke of the movable end of the contact blade 1 after contact, namely the deformation quantity S = v of the related part of the deformable conductive loop in the composite type electrical contact 2 /(2 a), calculated as S =0.256mm. The movable-end composite type electrical contact and the static-end composite type electrical contact adopt a structure of 3 middle cup seats and 2 tail cup seats, 5 cup seats are connected in series, and the average plastic deformation of each cup seat is L =0.256/5=0.0512mm.
Substituting the Manson-coffee formula to calculate the fatigue life:
Δεp·N α ＝D。
in the above formula, D is the static fracture toughness of the material, Δ ε p is the plastic strain amplitude, α is the fatigue ductility index, and N is the fatigue life.
The material of the middle cup holder 5 and the tail cup holder 6 is oxygen-free copper and is subjected to high-temperature brazing, so that the static fracture toughness D of the material is the value after annealing, and D =0.957.
The cup wall height of the middle cup holder 5 and the tail cup holder 6 is 10mm, and the simplified calculation result is that delta epsilon p =0.0512/10=0.00512.
The fatigue ductility index of oxygen-free copper is taken as α =0.55.
The fatigue life N =13500 times of the middle cup holder 5 and the tail cup holder 6 is calculated, and the mechanical life requirement of 10000 times of the vacuum switch is met.
In conclusion, the elastic deformation capacity of the composite type electrical contact is greatly improved, the impact force of the contact during the closing of the rapid switch can be absorbed through the buffer action, and the closing bounce of the contact is eliminated. According to the composite type electric contact with the moving end and the static end, the elastic deformation capacity is greatly improved, the impact force of the contact during the closing of the quick switch can be absorbed through the buffer action, and the closing bounce of the contact is eliminated.
Claims (8)
1. The composite type electrical contact is characterized by comprising a contact blade (1), at least one middle cup seat (5) and a tail cup seat (6) which are sequentially arranged, wherein elastic supporting structures are arranged in inner cavities of the middle cup seat (5) and the tail cup seat (6), each elastic supporting structure comprises a positioning backing ring (4), each positioning backing ring (4) sequentially penetrates through a disc-shaped gasket (3) and a supporting gasket (2), each supporting gasket (2) is arranged on the lower surfaces of the contact blade (1) and the middle cup seat (5), each positioning backing ring (4) is arranged on the upper surfaces of the middle cup seat (5) and the tail cup seat (6), and a stop gap (7) is reserved between the upper surface of each positioning backing ring (4) and the lower surfaces of the contact blade (1) and the middle cup seat (5).
2. Composite electrical contact according to claim 1, wherein the contact blade (1), the at least one centrally disposed cup (5) and the aft centrally disposed cup (6) are welded in succession, the positioning washer (4), the disc washer (3) and the supporting washer (2) having a clearance gap between them.
3. Composite electrical contact according to claim 1, characterized in that the stop gap (7) is less than 0.5mm.
4. Composite electrical contact according to claim 1, characterized in that the support gasket (2) is made of a high temperature resistant hard alloy.
5. Composite electrical contact according to claim 1, characterized in that the positioning collar (4) is made of a high temperature-resistant hard alloy.
6. Composite electrical contact according to claim 1, characterized in that the belleville washer (3) is made of a high-temperature-resistant elastic alloy.
7. Composite electrical contact according to claim 1, characterized in that the wall of the central cup (5) is provided with a central chute (8).
8. Composite electrical contact according to claim 1, wherein the cup wall of the aft cupholder (6) is provided with an aft chute (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011049153.7A CN112164621B (en) | 2020-09-29 | 2020-09-29 | Composite electric contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011049153.7A CN112164621B (en) | 2020-09-29 | 2020-09-29 | Composite electric contact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112164621A CN112164621A (en) | 2021-01-01 |
| CN112164621B true CN112164621B (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011049153.7A Active CN112164621B (en) | 2020-09-29 | 2020-09-29 | Composite electric contact |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208548316U (en) * | 2018-08-28 | 2019-02-26 | 宁波云振真空电器有限公司 | A kind of novel contact component |
| CN110047696B (en) * | 2019-05-14 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Low-bounce vacuum arc-extinguishing chamber contact structure |
| CN110556265A (en) * | 2019-09-06 | 2019-12-10 | 华东交通大学 | Rotary contact structure of vacuum arc-extinguishing chamber suitable for capacitive load switching |
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2020
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