CN2622967Y - Open-circuit, self-reset security unit - Google Patents

Abstract

The utility model relates to the communication matching equipment technical field, in particular to an open-circuit, self-reset security unit which is used for the main distribution frame, and for preventing the person and equipment in the telephone exchange from injury of over-voltage and over current on the outside connections. The utility model comprises a casing, wherein an inside connection loop and an outside connection loop are arranged in the casing, while a bimetallic strip and a link block of the inside connection and outside connection are also arranged in the casing, wherein the link block of the inside connection and the outside connection can be hooked on the bimetallic strip, the casing corresponding to the link block of the inside connection and the outside connection is provided with a push rod hole, a push rod penetrates the push rod hole, a boss is arranged at the other end of the push rod, a spring is arranged between the casing and the boss of the push rod. An alarming circuit is also arranged in the casing. The utility model has the advantages of unique structure, novel design, reasonable theory, good using effect, long service life, small and beautiful appearance, does not require replacing after motion, and can be reused after trouble is removed.

Description

Open type runback Security Unit

Affiliated technical field

The utility model relates to the communication support facility technical field, particularly relates to a kind of main frame that is used for, and is used for preventing the protective device that the person and equipment suffer the injury of overvoltage in the outside line, overcurrent in the telephone office.

Background technology

Security Unit is a very important protective element in the communications patching transmission.Country formulates strict industry standard, and the Security Unit of domestic production manufacturer production has nothing in common with each other in its structural design under this basis, and domestic product in usefulness is concluded four big classes at present.

1, non-self-resetting type, short-circuit protection.Adopt the PTC solid discharging tube, hot melt material is formed, and when outside line suffers the attack of non-transient overvoltage, makes the discharge tube heating of discharging for a long time, causes heat-fusible materials to be out of shape, and ground is gone in the overvoltage short circuit, gives a warning simultaneously.The defective of this Security Unit is: A, Security Unit can not be reused, and can not can not general term test big electric current protection, fail safe alarm, open circuit performance etc. thereby bring when dispatching from the factory.B, protected mode are short-circuit protection, therefore still have electric current to pass through in the circuit in protection, and long-time big electric current causes electric wire, cable to wear out by meeting, causes the computer room safety problem.

2, adopt big electric current fuse; the Security Unit of fusing open-circuit-protection; be on the basis of above-mentioned Security Unit, to have increased fusible link; when the defective of this Security Unit has two point: A to realize the fusing open-circuit-protection; open-circuit line only; thereby cause between the AB line potential difference being arranged, might damage cable or switch.When B fused at fusible link, abating protection device is action not, can not send alarm signal, may jeopardize attendant's safety.

3, ic-type Security Unit, it is fast that the advantage of this Security Unit is to protect the reaction time, and overvoltage, overcurrent all have alarm output.But cost is higher at present, and domestic in addition also do not have producer can produce this integrated circuit.

4, the full self-resetting type Security Unit of open type that adopts heat deformable material to make, this Security Unit utilizes thermo bimetal's chip memorial alloy, does abating protection device.Thereby the discharge tube heating produces distortion, break contact when overvoltage.But can occur the gap vibration when little electric current, this does not allow to take place in reality.

Summary of the invention

In order to overcome the deficiency of existing various Security Units, the utility model proposes a kind of manual runback Security Unit.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of open type runback Security Unit, has housing, be provided with in the housing by interior lines I pin, contact in the interior lines, interior lines PTC, the interior lines loop line that interior lines II pin link to each other to form and by outside line I pin, contact in the outside line, outside line PTC, the outside line loop line that outside line II pin links to each other and forms, the interior contact inboard of contact and outside line is provided with the discharge tube retention tab in the interior lines, discharge tube retention tab inboard is provided with discharge tube, between two discharge tubes bimetal leaf is set, one end of bimetal leaf connects foot of the ground wire, it is curved that the other end is provided with lock, be provided with internal and external line in the housing and connect slide block, one end of internal and external line connection slide block is push rod fixedly, other end fixing metal sheet, have lockhole on the sheet metal, connect the slide block place corresponding to internal and external line on the housing and have push-rod hole, push rod passes push-rod hole, and the other end of push rod is provided with boss, is provided with spring between the boss of housing and push rod.

Further: also be provided with warning circuit in the described housing, the warning light-emitting diode is arranged in the push rod 16.

Open type runback Security Unit of the present utility model, the structure uniqueness, modern design, principle is reasonable, and result of use is good, and the life-span is long, and external form is small and exquisite attractive in appearance, need not change after the action, and it is reusable that fault is got rid of the back.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the right view of Fig. 1.

Fig. 3 is a bimetal leaf of the present utility model and the schematic diagram that combines of sheet metal.

Among the figure, 1, housing, 2, interior lines I pin, 3, contact in the interior lines, 4, interior lines PTC, 5, interior lines II pin, 6, outside line I pin, 7, contact in the outside line, 8, outside line PTC, 9, outside line II pin, 10, the discharge tube retention tab, 11, discharge tube, 12, bimetal leaf, 13, foot of the ground wire, 14, lock is curved, 15, internal and external line connects slide block, 16, push rod, 17, sheet metal, 18, lockhole, 19, push-rod hole, 20, boss, 21, spring.

Embodiment

As Fig. 1, Fig. 2, open type runback Security Unit shown in Figure 3, has housing 1, be provided with in the housing 1 by interior lines I pin 2, contact 3 in the interior lines, interior lines PTC4, the link to each other interior lines loop lines that form and of interior lines II pin 5 by outside line I pin 6, contact 7 in the outside line, outside line PTC8, the outside line loop line that outside line II pin 9 links to each other and forms, interior contact 7 inboards of contact 3 and outside line are provided with discharge tube retention tab 10 in the interior lines, discharge tube retention tab 10 inboards are provided with discharge tube 11, two 11 of discharge tubes are provided with bimetal leaf 12, one end of bimetal leaf 12 connects foot of the ground wire 13, the other end is provided with lock curved 14, be provided with internal and external line in the housing 1 and connect slide block 15, one end of internal and external line connection slide block 15 is push rod 16 fixedly, other end fixing metal sheet 17, have lockhole 18 on the sheet metal 17, connect slide block 15 places corresponding to internal and external line on the housing 1 and have push-rod hole 19, push rod 16 passes push-rod hole 19, and the other end of push rod 16 is provided with boss 20, and 20 of the boss of housing 1 and push rod 16 are provided with spring 21.Also be provided with warning circuit in the described housing 1, the warning light-emitting diode is arranged in the push rod 16.

When work is used, the lock of bimetal leaf 12 curved 14 stretches in the lockhole 18 on the sheet metal 17 that internal and external line connects slide block 15, internal and external line is connected slide block 15 to be hooked, thereby make interior lines I pin 2, contact 3 in the interior lines, interior lines PTC4, the interior lines loop line that interior lines II pin 5 links to each other and forms, also make outside line I pin 6, contact 7 in the outside line, outside line PTC8, the outside line loop line that outside line II pin 9 links to each other and forms, in the internal and external line loop, under the effect of discharge tube retention tab 10, discharge tube 11 is clipped in the middle bimetal leaf 12, one end of bimetal leaf 12 links to each other with foot of the ground wire 13, thereby make before inside and outside formation loop line, ground wire is ground connection at first.When operate as normal, make communication channel unimpeded by above loop.When in the circuit abnormal current being arranged, PCT4 and PCT8 action are high-impedance state, circuit is disconnected, prevent that abnormal current from flowing into interior lines, when having the 220V power-frequency voltage to exist in the circuit, discharge tube 11 heating work, make the circuit ground conducting, in addition, because the heating of discharge tube 11 makes bimetal leaf 12 bendings, the lock of bimetal leaf 12 curved 14 skids off internal and external line and connects lockhole 18 on the sheet metal 17 of slide block 15, under the effect of the spring 21 of 20 settings of boss of housing 1 and push rod 16, push rod 16 moves after being with internal and external line to connect slide block 15, and internal and external line and interior contact are disconnected, and circuit is open-circuit condition, cut off the connection of internal and external line, simultaneously, move the pin that makes diode on the internal and external line connection slide block 15 and contact with holding wire with the ground wire lead-in wire simultaneously, led lighting is reported to the police.Press reseting sleeve after voltage is got rid of, the lock curved 14 of bimetal leaf 12 is stretched in the lockhole 18 on the sheet metal 17 that internal and external line connects slide block 15, internal and external line is connected slide block 15 hook, open type runback Security Unit can be reworked again.

Claims (2)

1, a kind of open type runback Security Unit, has housing (1), be provided with in the housing (1) by interior lines I pin (2), contact in the interior lines (3), interior lines PTC (4), the interior lines loop line that interior lines II pin (5) link to each other to form and by outside line I pin (6), contact (7) in the outside line, outside line PTC (8), the outside line loop line that outside line II pin (9) links to each other and forms, it is characterized in that: contact (7) inboard is provided with discharge tube retention tab (10) in contact in the interior lines (3) and the outside line, discharge tube retention tab (10) inboard is provided with discharge tube (11), bimetal leaf (12) is set between two discharge tubes (11), one end of bimetal leaf (12) connects foot of the ground wire (13), the other end is provided with lock curved (14), be provided with internal and external line in the housing (1) and connect slide block (15), one end of internal and external line connection slide block (15) is push rod (16) fixedly, other end fixing metal sheet (17), have lockhole (18) on the sheet metal (17), housing (1) is gone up corresponding to internal and external line connection slide block (15) and is located to have push-rod hole (19), push rod (16) passes push-rod hole (19), the other end of push rod (16) is provided with boss (20), is provided with spring (21) between the boss (20) of housing (1) and push rod (16).

2, open type runback Security Unit according to claim 1, it is characterized in that: described housing also is provided with warning circuit in (1), and the warning light-emitting diode is arranged in the push rod (16).

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