CN2116299U - Instantaneous overload current protector - Google Patents
Instantaneous overload current protector Download PDFInfo
- Publication number
- CN2116299U CN2116299U CN 92201956 CN92201956U CN2116299U CN 2116299 U CN2116299 U CN 2116299U CN 92201956 CN92201956 CN 92201956 CN 92201956 U CN92201956 U CN 92201956U CN 2116299 U CN2116299 U CN 2116299U
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- protection
- loop
- explosion
- instantaneous
- protector
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Abstract
The utility model relates to an instantaneous overload current protector, comprising a two-stage protection circuit, a choked flow return circuit and an explosion-proof device. The protective circuit can be used for installing in a sealed explosion-proof device, and can also be used singly. The instantaneous overload current protector can be suitable for preventing the damage of instruments and meters caused by thunder, instantaneous overvoltage and instantaneous overcurrent, and can also be used for the protection of other electric appliances.
Description
The utility model relates to a kind of instantaneous overcurrent protection device, is applicable to the anti-thunder and lightning of instrument and meter, and the infringement that anti-instantaneous overvoltage and overcurrent cause also can be used for the protection of other electric equipment products.
Aspect the lightning protection of instrument and anti-instantaneous overvoltage, domestic still do not have this series products at present, and there is a kind of lightning arrester that is used for the said firm's capacitance pressure transmitter protection in company of Rosemount China Inc., and its performance of the structures shape of this lightning arrester has 2 deficiencies at least:
Because it only uses discharge tube to do heavy impulse current protection, and the response speed of discharge tube is slow, thereby poor to the superpotential protective value of steep wave, it 2 is that introducing product does not have the flame proof function, can not be applied to inflammable occasion, so domesticly seldom adopt.
The purpose of this utility model is to overcome weak point of the prior art, and a kind of have two-stage protection loop, the instantaneous overcurrent protection device that choked flow loop and explosion-protection equipment are formed are provided.
Concrete solution of the present utility model is such, and the instantaneous overcurrent protection device that is provided is protected the loop by two-stage, and choked flow loop and explosion-protection equipment are formed, and first order protection part is by piezo-resistance loop Y
1With discharge tube loop F
1Form F
1Play restriction Y
1The effect of too high residual voltage.The choked flow part is by reactance Z
1And Z
2Form; Second level protection part is by discharge tube loop F
2, piezo-resistance loop Y
2Form Y with semiconductor voltage limit circuit D
2Prevent F
2Asymmetricly between two lines, produce overvoltage, D limits Y
2Residual voltage; all junctions of the shell of explosion-protection equipment all seal with sealing ring; definitely isolated with flammable explosive gas in housing to guarantee wiring board; the inlet wire of input is connected input and output lead-in wire with screw and all compresses the seal with elastometic washer lead-in wire with clamping nut with the binding post made from the preventing arc plastics, protector is threaded with taper with protected instrument.
The wiring board of this protector can be packed into and be used together in the explosion-protection equipment, also can be contained in separately on the protection instrument to use.
The utility model has following advantage compared with the prior art:
1, protective value is good, the life-span is long, response speed is fast, and ability to bear is doubled.
2, because this protector is a passive device, and equiva lent impedance is little, so consumed power not substantially under the normal condition does not influence the transmission of signal;
3, this protector is installed, is changed conveniently.
Below in conjunction with accompanying drawing the utility model is described further.
Fig. 1 is a line map of the present utility model;
Fig. 2 is the structural representation of explosion-protection equipment of the present utility model;
Fig. 3 is the structural representation of common unit of the present utility model;
Fig. 4 is one of the utility model circuit embodiment;
Fig. 5 is two of the utility model circuit embodiment;
1-rubber ring 2-binding post 3-sealing ring among the figure
4-sealing ring 5-shell 6-wiring board
7-sealing ring 8-rubber ring 9-taper screw thread
Fig. 1 is a line map of the present utility model, and first order protection part is by piezo-resistance loop Y
1With discharge tube loop F
1Play restriction Y
1The effect of too high residual voltage, the choked flow part is by reactance Z
1And Z
2Form, second level protection part is by discharge tube loop F
2, piezo-resistance loop Y
2Form Y with semiconductor voltage limit circuit D
2Prevent F
2Asymmetricly between two lines, produce overvoltage, D limits Y
2Residual voltage.When input 1
1n2
1uDuring last generation overvoltage, at first through first order protection part, big electric current is released over the ground or between two lines by first order protection loop, and overvoltage Limiting within the specific limits.The output voltage in first order protection loop still might be higher than the deboost of protected object; current limliting is carried out to it in the choked flow loop; step-down all is limited under the limiting voltage of protected object last output line line and line ground voltage again by second level protective circuit pressure limiting.
Fig. 2 is the structural representation of explosion-proof type device of the present utility model, this explosion-protection equipment is an all-sealed structure, shell ［ 5 ］ is made by carbon steel, and sealing ring ［ 3 ］ ［ 4 ］ ［ 7 ］ sealing is all used in all junctions, guarantees that wiring board ［ 6 ］ is isolated with flammable explosive gas in housing.The inlet wire of input all has clamping nut to compress rubber ring ［ 1 ］ ［ 8 ］ sealing wire with screw and firm being connected of the binding post of being made by the preventing arc plastics ［ 2 ］, input and output lead-in wire.Protector is connected with garden taper thread ［ 9 ］ with protected instrument, and the screw thread place twines polytetrafluoroethylene film, guarantees that the junction sealing is reliable.
Fig. 3 is the structural representation of plain edition device of the present utility model, and shell ［ 5 ］ is made with carbon steel, and sealing ring ［ 3 ］ sealing is all used in all junctions.The mode that input/output terminal solidifies filler with casting seals.This protector is connected with taper screw thread ［ 9 ］ with protected instrument.Wiring board ［ 6 ］ is installed in the steel shell, and output leaves the taper screw thread, can be connected with the lead-in wire pipeline easily, and can seal reliably.
Fig. 4, Fig. 5 are two embodiments of the utility model circuit, and the protected object limiting voltage requires to be line and line; Be not more than 56V, line be not more than 100V, electric induction is selected for use more than the 15 μ H among the figure, line line voltage is 47V, the line ground voltage is 70V.
Claims (3)
1, a kind of instantaneous overcurrent protection device, by two-stage protection loop, choked flow loop and explosion-protection equipment are formed, and it is characterized in that first order protection part is by piezo-resistance loop Y
1With discharge tube loop F
1Form; The choked flow part is by reactance Z
1And Z
2Form; Second level protection part is by discharge tube loop F
2, piezo-resistance loop Y
2Form with semiconductor voltage limit circuit D.
2, instantaneous overcurrent protection device as claimed in claim 1 is characterized in that these all junctions of explosion-protection equipment shell ［ 5 ］ all use sealing ring ［ 3 ］ ［ 4 ］ ［ 7 ］ sealing.Guarantee that wiring board ［ 6 ］ is isolated with flammable explosive gas in housing; The inlet wire of input is connected with the binding post made from the preventing arc plastics ［ 2 ］ with screw, and input all compresses rubber ring ［ 1 ］ ［ 8 ］ sealing wire protector with clamping nut with the output lead-in wire and is connected with taper screw thread ［ 9 ］ with protected instrument.
3, as claim 1 or 2 described instantaneous overcurrent protection devices, it is characterized in that the wiring board of this protector can use with explosion-protection equipment, also can be contained in separately on the protected instrument and use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92201956 CN2116299U (en) | 1992-01-27 | 1992-01-27 | Instantaneous overload current protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92201956 CN2116299U (en) | 1992-01-27 | 1992-01-27 | Instantaneous overload current protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2116299U true CN2116299U (en) | 1992-09-16 |
Family
ID=4948906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92201956 Granted CN2116299U (en) | 1992-01-27 | 1992-01-27 | Instantaneous overload current protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2116299U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101375480B (en) * | 2006-01-24 | 2012-02-22 | 费希尔控制产品国际有限公司 | Flameproof apparatus using non-grounded energy-limiting barrier |
| CN103078307A (en) * | 2013-01-27 | 2013-05-01 | 黄永捷 | Lightning-protected switch-signal indicating rectifier |
-
1992
- 1992-01-27 CN CN 92201956 patent/CN2116299U/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101375480B (en) * | 2006-01-24 | 2012-02-22 | 费希尔控制产品国际有限公司 | Flameproof apparatus using non-grounded energy-limiting barrier |
| CN103078307A (en) * | 2013-01-27 | 2013-05-01 | 黄永捷 | Lightning-protected switch-signal indicating rectifier |
| CN103078307B (en) * | 2013-01-27 | 2016-02-03 | 黄永捷 | Lightning protection track switch signal indication rectifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Huang Yixin Document name: Letter of authorization |
|
| 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 |