CN87214600U - Low-voltage automatic current limit switch - Google Patents
Low-voltage automatic current limit switch Download PDFInfo
- Publication number
- CN87214600U CN87214600U CN 87214600 CN87214600U CN87214600U CN 87214600 U CN87214600 U CN 87214600U CN 87214600 CN87214600 CN 87214600 CN 87214600 U CN87214600 U CN 87214600U CN 87214600 U CN87214600 U CN 87214600U
- Authority
- CN
- China
- Prior art keywords
- automatic current
- strip
- main contact
- electric heating
- low pressure
- 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.)
- Withdrawn
Links
Images
Abstract
The utility model relates to a low-voltage automatic current limit switch, which is composed of a bimetallic strip, an electric heating strip, a moving strip, a bow-shaped reed, a main contact, regulating bolts, the outer terminal of a counter, and the insulating layer of asbestos paper. The insulating layer of asbestos paper is coiled on the bimetallic strip. The electric heating strip is coiled on the insulating coat of the asbestos paper. The left end of the bimetallic strip is connected with the lower end of the moving strip. The upper end of the moving strip is contacted to the bow-shaped reed. One end of the bow-shaped reed is connected with the electric heating strip by inter connectors, and the other end is contacted to the upper end of the main contact. The lower end of the main contact is contacted to the inner end of the outer terminal of the counter. The elements are arranged in an enclosed type casing.
Description
The utility model belongs to a kind of improvement of emergency protective device.
Low pressure automatic current limiting switch is a kind of automatic safety device of signalling arrangement.Be suitable for using in the track circuit of electric railway, it can reduce the signal fault time-delay that is caused because of the traction current imbalance.
At present, double track bar supply power mode is all adopted in electric railway.In the electric locomotive running, the traction current between double track produces uneven, often causes the fault of current-limiting protection device fusing in the track circuit, makes in the station and interval orbit circuit cisco unity malfunction, has a strong impact on the normal operation of train.
The purpose of this utility model provides a kind of low pressure automatic current limiting switch that can cut off automatically with multiple connection and replaces current-limiting protection device in the track circuit.
The utility model adopts the thermocouple operation principle, when uneven traction current is invaded, if when its inrush current reaches 1.2 times of low pressure automatic current limiting switch load current value, owing to use 5J
16The bimetal leaf of making is heated and produces significant deformation, will promote moving plate and drive the contact disconnection, reaches the purpose of guard signal equipment.After circuitry cuts, the temperature of bimetal leaf descends gradually, up to cooling fully, the contact is returned to the original form.So signalling arrangement recovers operate as normal again.
After signalling arrangement began operate as normal, because signalling arrangement uses electric current less, temperature rise was very little, and bimetal leaf can not produce significant thermal deformation, thus signal code by the time, can not produce malfunction.
Below in conjunction with accompanying drawing the utility model is described in detail as follows:
Fig. 1, low pressure automatic current limiting switch schematic diagram
In Fig. 1, external terminal 1 is connected the position of the former fuse of signalling arrangement.Asbestos paper insulating barrier 3 is wrapped on the bimetal leaf 4, twines electric heating piece 5 on the asbestos paper insulating barrier 3.The left end of bimetal leaf 4 is connected with the lower end of moving plate 6, and the upper end of moving plate 6 contacts with arc spring 10.One end of arc spring 10 is connected with electric heating piece 4 by interconnector 2; The interior end in contact of the upper end of the other end of arc spring 10 and main contact 8 and external terminal 1.The interior end in contact of the lower end of main contact 8 and counter external terminal 7.Regulate the stressing conditions that bolt 9 is used for regulating arc spring, said elements all is contained in the enclosed housing 11.
Embodiment:
Low pressure automatic current limiting switch is connected the position of the former fuse of signalling arrangement.When unsymmetrical current when external terminal 1 flows into low pressure automatic current limiting switch, bimetal leaf 4 is heated and is bent upwards, and upwards promote moving plate 6, the upper end of moving plate 6 promotes arc spring 10 again, make arc spring 10 produce a downward active force, impel main contact 8 to disconnect, when main contact 8 disconnects, counter circuit is connected, and counting once.
Claims (5)
1, a kind of low pressure automatic current limiting switch, it is characterized in that: it is made up of bimetal leaf, electric heating piece, moving plate, arc spring, main contact, adjusting bolt, counter external terminal and asbestos paper insulating barrier.
2, low pressure automatic current limiting switch according to claim 1 is characterized in that: be tied with the asbestos paper insulating barrier on the bimetal leaf, electric heating piece is entangled on the asbestos paper insulating barrier;
3, low pressure automatic current limiting switch according to claim 1, it is characterized in that: the lower end of moving plate is connected with the left end of bimetal leaf, and the upper end of moving plate contacts with arc spring;
4, low pressure automatic current limiting switch according to claim 1, it is characterized in that: an end of arc spring contacts with main contact, and the other end of arc spring is connected with electric heating piece by interconnector;
5, low pressure automatic current limiting switch according to claim 1 is characterized in that: the interior end in contact of the upper end of main contact and external terminal, the interior end in contact of the lower end of main contact and counter external terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87214600 CN87214600U (en) | 1987-10-27 | 1987-10-27 | Low-voltage automatic current limit switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87214600 CN87214600U (en) | 1987-10-27 | 1987-10-27 | Low-voltage automatic current limit switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87214600U true CN87214600U (en) | 1988-04-06 |
Family
ID=4828880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87214600 Withdrawn CN87214600U (en) | 1987-10-27 | 1987-10-27 | Low-voltage automatic current limit switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87214600U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047257C (en) * | 1994-03-15 | 1999-12-08 | 富士电机株式会社 | Thermomotive over-load relay |
| CN1049524C (en) * | 1993-08-16 | 2000-02-16 | 富士电机株式会社 | Heat sensitive overload relay |
| CN103620723A (en) * | 2011-07-05 | 2014-03-05 | 西门子公司 | Overload release, in particular for a circuit breaker |
-
1987
- 1987-10-27 CN CN 87214600 patent/CN87214600U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049524C (en) * | 1993-08-16 | 2000-02-16 | 富士电机株式会社 | Heat sensitive overload relay |
| CN1047257C (en) * | 1994-03-15 | 1999-12-08 | 富士电机株式会社 | Thermomotive over-load relay |
| CN103620723A (en) * | 2011-07-05 | 2014-03-05 | 西门子公司 | Overload release, in particular for a circuit breaker |
| CN103620723B (en) * | 2011-07-05 | 2016-02-17 | 西门子公司 | For the overload release of circuit breaker |
| US9455109B2 (en) | 2011-07-05 | 2016-09-27 | Siemens Aktiengesellschaft | Overload release, in particular for a circuit breaker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204696674U (en) | A kind of surge protector through-flow greatly | |
| CN87214600U (en) | Low-voltage automatic current limit switch | |
| CN101685722B (en) | Double temperature-sensing power-off circuit protection structure | |
| CN113053701A (en) | Automatic recovery fuse | |
| CN104810814A (en) | Chase-flow surge protector | |
| CN112202006A (en) | Household power strip circuit protection device based on energy-saving and environment-friendly concept | |
| CN203883550U (en) | PC-class dual-power-supply change-over switch | |
| CN101728120B (en) | Dual temperature sensing cutoff circuit protective device | |
| CN2263773Y (en) | Refrigerator protector without energy consuming | |
| CN2250524Y (en) | Self protective and limited electric meter | |
| CN204407276U (en) | Multifunction low-voltage circuit breaker | |
| CN201436675U (en) | Intelligent fireproof switch | |
| CN2158135Y (en) | Ten-thousands times safety tube | |
| CN216252158U (en) | Emergency protection circuit device | |
| CN217933683U (en) | Circuit breaker for earth leakage protection | |
| CN2192970Y (en) | Protective knife switch for three-phase electric motor | |
| CN220711117U (en) | Circuit for resisting voltage disturbance | |
| CN217847271U (en) | Automatic alarm device for screw loosening on box-type transformer low-voltage circuit breaker | |
| CN2289295Y (en) | Double-safety temp.-controling switch | |
| CN2399872Y (en) | Protector | |
| CN2416581Y (en) | Transformer for freezing cabinet | |
| CN2301025Y (en) | Overvoltage protection external wire switching off device for main wire distribution frame | |
| CN2399873Y (en) | Over-current protector for railway electrical zone rail circuit | |
| CN2218263Y (en) | Self heat-protector of refrigerator compressor | |
| CN2171187Y (en) | Simple fire-proof temp. regulating switch for electric heating blanket |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |