CN2109633U - Current limiting safety box plug - Google Patents
Current limiting safety box plug Download PDFInfo
- Publication number
- CN2109633U CN2109633U CN 91229464 CN91229464U CN2109633U CN 2109633 U CN2109633 U CN 2109633U CN 91229464 CN91229464 CN 91229464 CN 91229464 U CN91229464 U CN 91229464U CN 2109633 U CN2109633 U CN 2109633U
- Authority
- CN
- China
- Prior art keywords
- safety box
- ptc element
- box plug
- current limiting
- limiting safety
- 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.)
- Granted
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- Emergency Protection Circuit Devices (AREA)
- Thermistors And Varistors (AREA)
Abstract
The utility model discloses a current limiting safety box plug, comprising an outer shell, a rear lid, and two inserting pieces. The current limiting safety box plug is characterized in that a PTC element, a radiating fin and a pressing piece are arranged in the outer shell; the pressing piece presses the PTC element on the radiating fin; the two inserting pieces are respectively connected with the pressing piece and the radiating fin; the PTC element is connected in series with a load. When an electric current exceeds a rated electric current, the temperature of the PTC element rises, the resistance value ascends to dozens of kilohm from 3 to 5 omega normally, the electric current is in a blocking state, and the current limiting safety box plug has a current-limiting action. After the load is removed, the utility model automatically recovers power supply after one to two minutes. The utility model has the advantages of small size, simple structure, low cost, and strong interchange ability; the current limiting safety box plug only are provided with two external connecting ends.
Description
The utility model relates to flow restricter, is specifically related to a kind of current limliting safety box plug.
Known air automatic switch complex structure, volume is bigger, has influenced to apply; The electronic current limiter that provides in the prior art needs the two ends input, and two ends output is used inconvenient.
The purpose of this utility model is to provide the current limliting safety box that a kind of volume is little, in light weight, interchangeability is good plug.
The utility model comprises shell, bonnet and two inserted sheets, it is characterized in that being equipped with in the shell semistor PTC element, fin and compressing tablet, an inserted sheet links to each other with fin, and another inserted sheet links to each other with compressing tablet, and the PTC element is clipped between compressing tablet and the fin.
The utility model only needs end input, end output, is connected in series with load, can exchange with known single-phase safety box plug, is easy to apply, advantage such as have that volume is few, in light weight, simple in structure, reliable operation, interchangeability are good.
The utility model has following accompanying drawing:
Fig. 1 current limliting safety box plug construction schematic diagram
Below in conjunction with accompanying drawing structure of the present utility model is described in further detail.
The safety box plug of accompanying drawing 1 comprises shell 1, bonnet 5 and inserted sheet 6,7.The shape of shell, feeling can be identical with known single-phase safety box plug, are beneficial to exchange.Shell 1, bonnet 5 can be selected flame retardant plastics or making such as other heat-resisting plasticity such as bakelite for use, and bonnet and shell 1 tight fit also can link together by screw 4.Semistor 3(PTC element is housed in the shell 1), fin 2 and compressing tablet 8, inserted sheet 6,7.Fin 2 and compressing tablet 8 can adopt aluminium alloy, copper alloy or other conductor to be stamped to form.Inserted sheet 7 links to each other with fin 2, and inserted sheet 6 links to each other with compressing tablet 8, and PTC element 3 is clipped between compressing tablet 8 and the fin 2.The effect of compressing tablet 8 is that PTC element 3 is pushed down, to guarantee to have good electrical contact.The effect of fin 2 is to make 3 coolings of the PTC element of heating, so that electrical equipment recovers normal as early as possible.PTC element 3 is connected with load through inserted sheet 6,7, and during less than rated current, the resistance of PTC element 3 is very low at electric current, and usually less than 5 Ω, temperature also is lower than its Curie point, and load can operate as normal.When electric current surpasses rated current, 3 heatings of PTC element, temperature is raised to more than the Curie point, and its resistance sharply is elevated to tens kilohms of magnitudes, promptly is in blocking state, is equivalent to cut off circuit, plays metering function, the use of the electrical equipment that can prevent to overload.After removing load appliance, fin 2 helps the PTC element radiating, but automatic recovery of power supply after about 1～2 minute.
The shape of shell 1 can equally with known plug be made cuboid, and the centre is provided with column 9, to connect bonnet 5 by screw 4.Compressing tablet 8 can be rectangle, and middle porose, to be enclosed within on the column 9, compressing tablet 8 also has thermolysis.Also porose in the middle of the fin 2, to be enclosed within on the column 9.Fin shape can be with known large power, electrically sub-element similar, area of dissipation is big as far as possible, increasing the limit by electric current, and reduces the recovery time after blocking.Inserted sheet 6,7 and fin 2, compressing tablet 8 can pass through screw 10 thread connection.The PTC element can be selected a piece element of rectangle or disc for use, also can adopt to be connected in parallel more than two or two between compressing tablet 8 and the fin 7.The center that also can be made into is with holes, is enclosed within on the column 9.
As a kind of embodiment: PTC element 3 can be selected the element of 80～85 ℃ of Curie points for use, and diameter can be selected φ 15mm for use, and thickness can be selected 2～3mm for use.The maximum current that limits behind the radiation fin can be 3 amperes.
Claims (2)
1, a kind of current limliting safety box plug, comprise shell 1, bonnet 5 and inserted sheet 6,7, it is characterized in that being equipped with in the shell semistor PTC element 3, fin 2 and compressing tablet 8, inserted sheet 7 links to each other with fin 2, the PTC element is clipped between compressing tablet 8 and the fin 2, and inserted sheet 6 links to each other with compressing tablet 8.
2, plug as claimed in claim 1, its feature are that also said PTC element 3 employings are connected in parallel more than two or two between compressing tablet 8 and the fin 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91229464 CN2109633U (en) | 1991-11-30 | 1991-11-30 | Current limiting safety box plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91229464 CN2109633U (en) | 1991-11-30 | 1991-11-30 | Current limiting safety box plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2109633U true CN2109633U (en) | 1992-07-08 |
Family
ID=4934963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91229464 Granted CN2109633U (en) | 1991-11-30 | 1991-11-30 | Current limiting safety box plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2109633U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102668268A (en) * | 2009-09-09 | 2012-09-12 | 托马斯·魏贝尔 | Plug connector and method for producing a plug connector |
-
1991
- 1991-11-30 CN CN 91229464 patent/CN2109633U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102668268A (en) * | 2009-09-09 | 2012-09-12 | 托马斯·魏贝尔 | Plug connector and method for producing a plug connector |
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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 |