CN2058046U - Non-contact cut-off type telephone general wiring frame plug-in protector - Google Patents

Abstract

The utility model relates to a small-sized inserting protector for a telephone main distributing frame, which is the improvement for a cut-off type telephone main distributing frame inserting protector of the Chinese patent application of CN88217805. The utility model is characterized in that discharge tube, a heat coil and a thimble are welded on an external connecting telephone cable socket mental sheet nearby a discharge tube by a low melting point alloy cut-off fuse. Furthermore, the cut-off fuse is fixedly connected to a socket metal sheet for connecting with an exchanger. Therefore, the small-sized inserting protector is matched with the discharge tube to accomplish three safeties, efficiently protect telephone circuits, equipment and personal safety. The utility model is a general and safe small-sized inserting protector.

Description

Non-contact cut-off type telephone general wiring frame plug-in protector

The utility model relates to the small-sized plug-in type protector on a kind of telephone main frame.

China applies for a patent CN88217805.9 " cut-off type telephone main frame plug-in type protector " and discloses a kind of fixedly connected sheet metal with external telephone cable and be improved to jack and touch the cut-off type plug-in type protector that spring contact connects.During this protector operate as normal, the contact that jack touches spring is an excellent electric contact, and when sealing in the sustained overvoltage electric current accidentally, heating coil moves rapidly, the contact that jack touches spring is along with the action of heating coil transfers the insulation contact immediately to, external circuit in cutting off makes overvoltage can not enter telephone exchange.It is a kind of protector of safety.Yet the contact protector remains in weak point.May produce contact oxidation after its long-term storage, loose contact, influence communication.Secondly, in the protector,, produce and damage switch, threaten the pernicious consequence of personal safety in case when having other obstacle to occur, also may flow through the big electric current of overvoltage.Thus, for fear of the unsafe factor that this small-sized plug-in type protector may exist, the utility model improves and has designed a kind of non-contact three insurance cut-off type telephone main frame plug-in type protectors.

The purpose of this utility model is to improve break of contact type telephone main frame plug-in type protector, adopt low-melting alloy thermal cut-out and heating coil, discharge tube, fusing device to constitute the two cut-off type telephone main frame plug-in type protectors of three insurances, thereby ensure telephone communication set and personal safety.

In brief, the utility model is can not insantaneous break external cable end and switch terminal circuit and the three insurance cut-off type telephone main frame plug-in type protectors that design at telephone main frame plug-in type protector, and it mainly is near welding low-melting alloy thermal cut-out on the socket metal connecting sheet of the external telephone cable of discharge tube in protector; Connecting on the socket metal connecting sheet of exchanger circuit fixedly the adjunction fusing device and, constituting three insurance protectors in conjunction with original discharge tube.The utility model protector improves on " cut-off type telephone main frame plug-in type protector ", promptly except replacing the contact contact with the welding of low-melting alloy thermal cut-out; Outside the adjunction fusing device, other is with cut-off type telephone main frame plug-in type protector on the sheet metal that connects switch.Need to prove that choosing of fusing device should select its blowout current less than the fusing device that jeopardizes in the exchanger extension circuit permission rated current scope.

The utility model has the advantages that conspicuous.It is operate as normal under normal conditions not only, and when sealing in the big electric current of overvoltage accidentally, cuts off external cable end and switch terminal circuit rapidly.So both avoid the machine room fire incident, protected cable and telephone communication set again effectively, ensured the safety of the person and property.

Description of drawings:

Fig. 1 is the structure chart of the utility model protector.Wherein, the 1st, the flame retardant plastics shell; The 2nd, the grounded metal brace; The 3rd, stage clip; The 4th, ceramic discharge tube; The 5th, the low-melting alloy thermal cut-out; The 6th, heating coil; The 7th, binding post; The 8th, fusing device; The 9th, the fire-retardant housing-plate of moulding; The 10th, external cable end sheet metal socket; The 11st, switch wiring metal sheet socket; The 12nd, the alarm pin; The 13rd, grounding pin; The 14th, the contact on the alarm pin; The 15th, the ground connection elastic sheet metal; The 16th, thimble; The 17th, protector action indicating piece.

Fig. 2 is the utility model wiring electrical schematic diagram.Wherein, the 18th, the audible and visual alarm device.

Describe the embodiment that meets the utility model theme in detail below in conjunction with accompanying drawing.

Press Fig. 1, jack in the cut-off type telephone main frame plug-in type protector is touched spring sheet metal contact to be improved, near welding with low-melting alloy thermal cut-out 5 and weld tabs, external cable end socket sheet metal 10 near the discharge tube 4, connect discharge tube 4, thimble 16 and heating coil 6.Then, increase fixedly connected fusing device 8 in socket sheet metal 11 upper ends that connect switch, the connection of other parts just constitutes the non-break of contact type of the utility model telephone main frame plug-in type protector with cut-off type telephone main frame plug-in type protector.When using the utility model protector, same protector is in the past equally worked under the normal condition.Yet, when the sustained overvoltage electric current is flowed through this protector, because of being selected in advance less than jeopardizing the exchanger extension circuit, the blowout current of fusing device 8 allows in the rated current scope, so before overvoltage electric current damage switch, fusing device 8 takes the lead in fusing, and cuts off overvoltage current direction switch.At this moment, the overvoltage that enters protector continues to make discharge tube 4 discharges, the temperature of heating coil 6 constantly raises, the low-melting alloy fusing that low-melting alloy circuit breaker 5 and thimble 16 and heating coil are 6, stage clip 3 is just depressed action indicating piece 17, discharge tube 4, thimble 16 and the weld tabs that is connected low-melting alloy circuit breaker 5 rapidly, thus being connected of disconnection external cable end socket sheet metal 10 and this protector.Simultaneously, three insurance security personnel are realized in thimble 16 contact grounding reeds 15 and alarm contact 14 that stage clip 3 is depressed, have protected telephone circuit equipment and personal safety effectively.

Claims (2)

1, a kind of cut-off type telephone main frame plug-in type protector, comprise flame retardant plastics shell 1, stage clip 3, ceramic discharge tube 4, thimble 16, heating coil 6, binding post 7, grounding pin 13, alarm pin 12, action indicating piece and be connected sheet metal, it is characterized in that:

Polyphone low-melting alloy thermal cut-out 5 on A, the external telephone cable socket sheet metal 10,

Series connection fusing device 8 on the socket sheet metal 11 of B, external exchanger circuit.

2, plug-in type protector according to claim 1, the blowout current that it is characterized in that fusing device 8 is less than the permission rated current that jeopardizes the exchanger extension circuit.

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