CN102737902B - Vacuum circuit breaker and electric locomotive - Google Patents
Vacuum circuit breaker and electric locomotive Download PDFInfo
- Publication number
- CN102737902B CN102737902B CN201110085158.XA CN201110085158A CN102737902B CN 102737902 B CN102737902 B CN 102737902B CN 201110085158 A CN201110085158 A CN 201110085158A CN 102737902 B CN102737902 B CN 102737902B
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- CN
- China
- Prior art keywords
- vacuum circuit
- breaker
- upper flange
- soft line
- elastic washer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention discloses a vacuum circuit breaker and an electric locomotive. The vacuum circuit breaker comprises an input terminal, an upper flange, a vacuum switch tube, a main static contact, a screw rod, a porcelain insulator soft connection line and an elastic washer. Two ends of the soft connection line are fixedly connected to the upper flange, and a middle joint of the soft connection line is in contact with an upper end face of the screw rod. The elastic washer is fixedly connected to the upper flange, a lower end surface of the elastic washer is in contact with the middle joint of the soft connection line. According to the vacuum circuit breaker, a problem of the poor contact of conductive contact surfaces of the vacuum circuit breaker caused by the loosing of fasteners like a screw and a bolt or the expansion and contraction of relevant parts caused by temperature change in the circuit breaker in the prior art can be thoroughly solved.
Description
Technical field
Type of the present invention relates to breaker structure technology, particularly a kind of vacuum circuit-breaker and electric locomotive.
Background technology
Main circuit breaker is all installed in electric locomotive, and main circuit breaker is for the cut-offfing of electrical locomotive power, overload and short-circuit protection.The main circuit breaker using in China's electric locomotive, relates generally to 22CB type vacuum circuit-breaker.
22CB type line vacuum circuit breaker important technological parameters:
Rated voltage: 25kV,
Rated current: 1000A,
Maximum breaking current: 16kA rms.
The partial structurtes schematic diagram of the vacuum circuit-breaker that Fig. 1 provides for prior art, Fig. 2 is the vertical view of Fig. 1, as depicted in figs. 1 and 2, existing 22CB series line vacuum circuit breaker, mainly comprise input terminal 19, upper flange 11, tin sheet 15, vacuum switch tube 12, arm-tie 13, porcelain insulator 17 and screw rod 14 etc., between the top of upper flange 11 and porcelain insulator 17, bond with heat-resistant adhesive 20, the inner chamber on porcelain insulator 17 tops and vacuum switch tube 12, between arm-tie 13 and screw rod 14, pour into silicon rubber 18, input terminal 19 is arranged on upper flange 11, vacuum switch tube 12 inside are provided with main fixed contact, screw rod 14 is connected with the main fixed contact in vacuum switch tube 12, arm-tie 13 is arranged on screw rod 14, strain arm-tie 13 with six soket head cap screws 16, arm-tie 13 drives screw rod 14 that the tin sheet 15 between screw rod 14 end faces and upper flange 11 counterbore end faces is compressed, ensure tin sheet 15 and screw rod 14 end faces and tin sheet 15 and upper flange 11 counterbore end face close contacts, make the contact resistance value≤50 μ Ω between main fixed contact and input terminal 19.
When normal operation of circuit breaker, the path that electric current flows through is: from the last ramp metering circuit of main fixed contact in input terminal → upper flange counterbore end face → tin sheet → screw rod → vacuum switch tube.In the interconnect structure of existing 22CB series line vacuum circuit breaker input terminal, between soket head cap screw and arm-tie, between arm-tie and screw rod, be between screw rod and tin sheet and be rigidly connected.
Due to the electric locomotive larger vibration that is in operation, when breaker closing, also there is certain impact, these factors all easily cause the soket head cap screw in main circuit breaker loosening, make conductive contact surfaces between tin sheet and screw rod end face or tin sheet and upper flange counterbore end face occur the problem of loose contact, therefore cause conductive contact area to reduce, the contact resistance value between main fixed contact and input terminal increases.
Circuit breaker cut-offs in the situation of the large electric current of being everlasting, therefore soket head cap screw, arm-tie, screw rod and upper flange can produce largely and expand with heat and contract with cold, under the long term expanding with heat and contract with cold, also can make conductive contact surfaces between tin sheet and screw rod end face or tin sheet and upper flange counterbore end face occur the problem of loose contact, cause conductive contact area to reduce, therefore cause the contact resistance value between main fixed contact and input terminal to increase.
If after the contact resistance value between main fixed contact and input terminal increases to a certain degree, under the effect of large electric current, tin sheet will be melted, and thickness reduces, and tin sheet and screw rod end face or tin sheet and upper flange counterbore end face are disengaged.After tin sheet and screw rod end face or tin sheet and upper flange counterbore end face disengage, the path that electric current flows through is: from the last ramp metering circuit of input terminal → upper flange → soket head cap screw → arm-tie → screw rod, and between screw rod and arm-tie, between soket head cap screw and arm-tie, be and be threaded, therefore cause electric current to flow through the contact resistance value in path very large, under the effect of large electric current, very high heat will be produced, hex screw temperature is around raise, therefore scaling loss soket head cap screw, even causes top porcelain insulator to burst.
In existing 22CB series vacuum circuit-breaker entrucking use procedure, often there is the fault that the overheated scaling loss of soket head cap screw and top porcelain insulator burst.Only 2010, just there are a lot of 22CB type vacuum circuit-breaker event of failures that cause for above-mentioned reasons.
Existing 22CB series vacuum circuit-breaker, while causing main circuit breaker fault to need repairing because of the overheated scaling loss of soket head cap screw in main circuit breaker, owing to boning with heat-resistant adhesive between the upper flange of input terminal and top porcelain insulator, the inner chamber of top porcelain insulator and vacuum switch tube, between arm-tie and screw rod, pour into silicon rubber, cannot change separately the tin sheet of scorification, can only integral replacing upper flange, vacuum switch tube, arm-tie, screw rod, tin sheet, soket head cap screw and top porcelain insulator, make troubles to the maintenance of main circuit breaker, and vacuum switch tube price is higher, add all parts that needs replacing, holistic cost is more than several ten thousand yuan, therefore maintenance cost is very high.
Summary of the invention
The invention provides a kind of vacuum circuit-breaker and electric locomotive, to solve the problem that easily causes conductive contact surfaces loose contact in existing vacuum circuit-breaker use procedure.
Vacuum circuit-breaker provided by the invention, comprises input terminal, upper flange, vacuum switch tube, main fixed contact, screw rod and porcelain insulator, also comprises:
Soft line, two end connectors of described soft line are fixedly connected on described upper flange, and the transition joint of described soft line contacts with described screw rod upper surface;
Elastic washer, is fixedly connected on described upper flange, and the lower surface of described elastic washer contacts with the transition joint of described soft line.
The present invention also provides a kind of electric locomotive, comprises electrical locomotive power, it is characterized in that, also comprises the main circuit breaker of vacuum circuit-breaker provided by the invention as electric locomotive power supply.
Vacuum circuit-breaker provided by the invention and electric locomotive, can thoroughly solve vacuum circuit-breaker of the prior art because the securing member such as screw, bolt is loosening or because of the expand with heat and contract with cold problem of the conductive contact surfaces loose contact causing of the related components in circuit breaker, ensure that or related components loosening at securing member expand with heat and contract with cold in more situation, contact resistance value between main fixed contact and input terminal, in safe range, avoids occurring the fault that vacuum circuit-breaker bursts because of the overheated scaling loss of screw and top porcelain insulator.
Brief description of the drawings
The partial structurtes schematic diagram of the vacuum circuit-breaker that Fig. 1 provides for prior art;
Fig. 2 is the vertical view of Fig. 1;
The partial structurtes schematic diagram of the vacuum circuit-breaker that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 is the vertical view of Fig. 3;
The end view of the partial structurtes of the vacuum circuit-breaker that Fig. 5 provides for the embodiment of the present invention;
The structural representation of the soft line of the vacuum circuit-breaker that Fig. 6 provides for the embodiment of the present invention;
Fig. 7 is the vertical view of Fig. 6;
The structural representation of the elastic washer of the vacuum circuit-breaker that Fig. 8 provides for the embodiment of the present invention;
Fig. 9 is the vertical view of Fig. 8.
Reference numeral:
11,42-upper flange; 12,43-vacuum switch tube; 13-arm-tie;
14,44-screw rod; 15-tin sheet; 16-screw;
17,45-porcelain insulator; 18-silicon rubber; 19,41-input terminal;
20-bonding agent; The soft line of 46-; 47-elastic washer;
461-two end connectors; 462-transition joint; 48-copper cushion block;
49-large washer; 50-briquetting; 51-straight pin;
52-bearing; 481-spring washer; 53-outer cover;
54-bolt; 551-the first nut; 552-the second nut;
553-the 3rd nut; 554-the 4th nut; 56-screw;
57-sealing ring.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The structural representation of the vacuum circuit-breaker that Fig. 3 provides for the embodiment of the present invention, Fig. 4 is the vertical view of Fig. 3, the end view of the partial structurtes of the vacuum circuit-breaker that Fig. 5 provides for the embodiment of the present invention, the structural representation of the soft line of the vacuum circuit-breaker that Fig. 6 provides for the embodiment of the present invention, Fig. 7 is the vertical view of Fig. 6, the structural representation of the elastic washer of the vacuum circuit-breaker that Fig. 8 provides for the embodiment of the present invention, the vertical view that Fig. 9 is Fig. 8.
As shown in Fig. 3 to Fig. 9, the vacuum circuit-breaker that the embodiment of the present invention provides, comprises input terminal 41, upper flange 42, vacuum switch tube 43, main fixed contact (not shown), screw rod 44, porcelain insulator 45, soft line 46 and elastic washer 47.
Input terminal 41 is arranged on upper flange 42, and as current input terminal of circuit breaker, vacuum switch tube 43 inside are provided with main fixed contact, and the lower surface of screw rod 44 is connected with the main fixed contact in vacuum switch tube 43.
Two end connectors 461 of soft line 46 are fixedly connected on upper flange 42, can two end connectors 461 of soft line 46 be fixed on upper flange 42 by multiple connected mode, for example, by riveted joint, welding etc., in the present embodiment, preferably, by bolt 54 and the 3rd nut 553, two end connectors 461 of soft line are fixed on upper flange 42.
Soft line 46 can adopt plain conductor, and in the present embodiment, preferably, as shown in Figure 6 and Figure 7, soft line 46 is the tin-coated copper litzendraht wire together with two end connectors 461 are crimped on transition joint 462.
And, for two end connectors that ensure soft line more reliably contact with the conductive contact surfaces between upper flange end face, and then ensure that contact resistance value between main fixed contact and input terminal, in safe range, can scribble and electrically contact grease between two end connectors 461 of soft line 46 and upper flange 42 end faces.
Elastic washer 47 is fixedly connected on upper flange 42, and the lower surface of elastic washer 47 contacts with the transition joint 462 of soft line 46.Can in several ways elastic washer 47 be fixedly connected on upper flange 42, for example, by modes such as riveted joint or bolt and nuts.
Elastic washer 47 can adopt diaphragm stage clip, rubber blanket etc., and in the present embodiment, preferably, as shown in Figure 8 and Figure 9, elastic washer 47 is the structure of three layers of cluster spring packing ring, is three spring washers, 481 use steel bushing rivetings combining together.
When this normal operation of circuit breaker, the path that electric current flows through is: from the last ramp metering circuit of main fixed contact in input terminal → upper flange → soft line → screw rod → vacuum switch tube, the common conductive contact surfaces that forms main fixed contact and input terminal of contact-making surface between contact-making surface, copper cushion block lower surface and screw rod upper surface between the contact-making surface between upper flange end face and soft line, soft line and copper cushion block upper surface, the contact resistance between each conductive contact surfaces forms the contact resistance of main fixed contact and input terminal.
As shown from the above technical solution, the vacuum circuit-breaker that the embodiment of the present invention provides, replace original tin sheet by soft line, employing has the soft line of transition joint, both the area of conductive contact surfaces and the current density of soft line between soft line and copper cushion block between soft line and screw rod upper surface or in the situation that thering is copper cushion block had been ensured, make again compact conformation, meet requirements of installation space.
And by elastic washer is set, when the securing member such as screw, bolt in circuit breaker becomes flexible, or because of the parts such as screw rod, screw, upper flange and the soft line degree of expanding with heat and contract with cold larger, therefore cause conductive contact surfaces will produce gap, when loose contact, strain by spring washer can be eliminated the gap that will produce between conductive contact surfaces, ensures that conductive contact surfaces contact is good, makes the contact resistance value between main fixed contact and input terminal substantially constant.
Therefore, the vacuum circuit-breaker that the embodiment of the present invention provides, can thoroughly solve circuit breaker of the prior art because the securing member such as screw, bolt is loosening or because of the expand with heat and contract with cold problem of the conductive contact surfaces loose contact causing of the related components in circuit breaker, ensure that or related components loosening at securing member expand with heat and contract with cold in more situation, contact resistance value between main fixed contact and input terminal, in safe range, avoids occurring the fault that main circuit breaker bursts because of the overheated scaling loss of screw and top porcelain insulator.
The vacuum circuit-breaker that the embodiment of the present invention provides is particularly useful in electric locomotive, as the main circuit breaker of electrical locomotive power, and a large amount of 22CB series vacuum circuit-breakers that use in alternative existing electric locomotive.
And, the 22CB series vacuum circuit-breaker using in because of the existing electric locomotive of the overheated scaling loss of screw, need to it be keeped in repair or be renovated time, only the counterbore in the middle of the upper flange of 22CB series vacuum circuit-breaker need to be processed into through hole, on upper flange, process again soft line installing hole, bearing installing hole and outer cover installing hole, finally around soft line installing hole, ward off tin, ward off tin area and be slightly larger than the contact-making surface of soft Connecting line joint, just can complete the transformation to upper flange.After upper flange transformation, take out tin sheet, the parts such as soft line, elastic washer, bearing and outer cover in the vacuum circuit-breaker that the embodiment of the present invention provides are installed again, just can complete the vacuum circuit-breaker maintenance of 22CB series or retrofit work, more than the total cost of maintenance or transformation is lower, greatly reduces the cost that existing 22CB series vacuum circuit-breaker is keeped in repair or renovated.
On the basis of above-described embodiment, further, between the transition joint 462 of soft line 46 and screw rod 44 upper surfaces, be provided with copper cushion block 48, to increase the contact area between soft line and screw rod upper surface, thereby reduce the contact resistance between conductive contact surfaces.
Further, between the transition joint of soft line and the upper surface of copper cushion block, and scribble and electrically contact grease between the lower surface of copper cushion block and screw rod upper surface, more reliable to ensure conductive contact surfaces contact, and then ensure that contact resistance value between main fixed contact and input terminal is in safe range.
On the basis of above-described embodiment, further, one large washer 49 can also be set between the transition joint of elastic washer 47 and soft line 462, to avoid elastic washer directly to contact with the transition joint of soft line, reduce the contact wear between the transition joint of elastic washer and soft line.
Further, briquetting 50 can also be set on elastic washer upper surface, and pass successively elastic washer 47, large washer 49, the transition joint 462 of soft line and the blind hole of copper cushion block 48 by the straight pin 51 on briquetting 50, prevent above-mentioned each parts dislocation, and ensure normal contact and the contact area of conductive contact surfaces, and then ensure that contact resistance value between main fixed contact and input terminal is in safe range.
On the basis of above-described embodiment, be also provided with bearing 52, bearing 52 is fixedly connected on upper flange 42, can be by riveting or the mode such as welding is fixedly connected on bearing on upper flange, in the present embodiment, preferably, be fixedly connected with the 4th nut 554 by bolt 54, be not limited to the present embodiment.Bolt 54 bottoms through bearing 52 middle parts are pressed on briquetting 50, and be provided with the first nut 551 being tightened on bolt 54, make between 46 transition joints 462 and the upper surface of copper cushion block 48 of soft line by the pretightning force of bolt and nut, contact-making surface between lower surface and screw rod 44 upper surfaces of copper cushion block 48 closely reliably contacts under certain contact effect.
Further, loosening for preventing between the first nut 551 and bolt 54, the second nut 552 is set above the first nut 551 and is tightened on bolt 54.
Further, for preventing that dust or other moisture and impurity from entering vacuum circuit-breaker, and affect the normal work of vacuum circuit-breaker, also be provided with outer cover 53, be located at the top of vacuum circuit-breaker, and be fixedly connected with upper flange 42 by screw 56, the below pad of head of screw is provided with seal washer, and in the groove of outer cover 53 bottoms, be provided with sealing ring 57, so that vacuum circuit-breaker is carried out to reliable waterproof and dust seal.
The embodiment of the present invention also provides a kind of electric locomotive, comprises electrical locomotive power, also comprises vacuum circuit-breaker that the embodiment of the present invention the provides main circuit breaker as electric locomotive power supply.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a vacuum circuit-breaker, comprises input terminal, upper flange, vacuum switch tube, main fixed contact, screw rod and porcelain insulator, it is characterized in that, also comprises:
Soft line, two end connectors of described soft line are fixedly connected on described upper flange, and the transition joint of described soft line contacts with described screw rod upper surface;
Elastic washer, is fixedly connected on described upper flange, and the lower surface of described elastic washer contacts with the transition joint of described soft line, and described elastic washer is a kind of structure of three layers of cluster spring packing ring specifically;
Copper cushion block, is arranged between the transition joint and described screw rod upper surface of described soft line;
Briquetting, is arranged on the upper surface of described elastic washer, and passes successively described elastic washer, the transition joint of soft line and the blind hole of copper cushion block by the straight pin on described briquetting.
2. vacuum circuit-breaker according to claim 1, is characterized in that,
Between the transition joint of described soft line and the upper end of copper cushion block, and scribble and electrically contact grease between the lower surface of copper cushion block and screw rod upper surface.
3. vacuum circuit-breaker according to claim 1, is characterized in that, also comprises:
Large washer, is arranged between described elastic washer and the transition joint of described soft line.
4. vacuum circuit-breaker according to claim 1, is characterized in that, also comprises:
Bearing, is fixedly connected on described upper flange, is pressed on described briquetting, and is provided with the first nut and the second nut that are tightened on described bolt through the bolt bottom at described bearing middle part, and described the second nut is arranged at the top of described the first nut.
5. vacuum circuit-breaker according to claim 1, is characterized in that, also comprises:
Outer cover, is located at the top of vacuum circuit-breaker, and is fixedly connected with described upper flange by screw, and the below pad of described head of screw is provided with spring washer and seal washer, in the groove of described outer cover bottom, is provided with sealing ring.
6. vacuum circuit-breaker according to claim 1, is characterized in that, described elastic washer is that the riveting of three spring washer steel bushings combines together.
7. vacuum circuit-breaker according to claim 1, is characterized in that, described soft line is the tin-coated copper litzendraht wire together with two end connectors are crimped on transition joint.
8. an electric locomotive, comprises electrical locomotive power, it is characterized in that, also comprises vacuum circuit-breaker described in the arbitrary claim of claim 1～7 main circuit breaker as electric locomotive power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110085158.XA CN102737902B (en) | 2011-04-06 | 2011-04-06 | Vacuum circuit breaker and electric locomotive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110085158.XA CN102737902B (en) | 2011-04-06 | 2011-04-06 | Vacuum circuit breaker and electric locomotive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102737902A CN102737902A (en) | 2012-10-17 |
| CN102737902B true CN102737902B (en) | 2014-10-22 |
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ID=46993195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110085158.XA Expired - Fee Related CN102737902B (en) | 2011-04-06 | 2011-04-06 | Vacuum circuit breaker and electric locomotive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102737902B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332351B (en) * | 2014-06-30 | 2017-05-24 | 天津平高智能电气有限公司 | Soft connection device and embedded pole using the same |
| CN107492468A (en) * | 2017-09-26 | 2017-12-19 | 日新恒通电气有限公司 | A kind of vacuum circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2476872Y (en) * | 2000-11-16 | 2002-02-13 | 北京电研华源电力技术有限公司 | Outdoor high-voltage vacuum circuit breaker |
| CN201298494Y (en) * | 2008-11-18 | 2009-08-26 | 上海宝临超亚电器有限公司 | Indoor high-voltage vacuum circuit-breaker |
| CN101834087A (en) * | 2010-04-19 | 2010-09-15 | 郑文秀 | Improved high-voltage breaker |
| CN101935147A (en) * | 2010-05-19 | 2011-01-05 | 河北东旭投资集团有限公司 | Flexible connection structure matched with electric heating flange of platinum channel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7802480B2 (en) * | 2004-05-18 | 2010-09-28 | Thomas And Betts International, Inc. | Method and apparatus for the detection of high pressure conditions in a vacuum-type electrical device |
-
2011
- 2011-04-06 CN CN201110085158.XA patent/CN102737902B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2476872Y (en) * | 2000-11-16 | 2002-02-13 | 北京电研华源电力技术有限公司 | Outdoor high-voltage vacuum circuit breaker |
| CN201298494Y (en) * | 2008-11-18 | 2009-08-26 | 上海宝临超亚电器有限公司 | Indoor high-voltage vacuum circuit-breaker |
| CN101834087A (en) * | 2010-04-19 | 2010-09-15 | 郑文秀 | Improved high-voltage breaker |
| CN101935147A (en) * | 2010-05-19 | 2011-01-05 | 河北东旭投资集团有限公司 | Flexible connection structure matched with electric heating flange of platinum channel |
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| Publication number | Publication date |
|---|---|
| CN102737902A (en) | 2012-10-17 |
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