CN1052821C - Heat-sensitive self reset device for safety unit - Google Patents

Abstract

The present invention relates to a heat-sensitive self resetting device for a safety unit. The heat-sensitive self resetting devices for a safety unit are parallel installed in a shell in pairs and are clamped by reeds, etc. or are welded by circuit boards. The present invention is composed of a discharge pipe, a thermistor and a shape memory alloy sheet, wherein both of the discharge pipe and the thermistor are in sufficient contact with the shape memory alloy sheet; the free end (segment) of the shape memory alloy sheet approaches to a circuit switching component. The present invention carries out a one-step overcurrent and overvoltage protective and alarm action every time, and effectively protects the safety of people and machines; simultaneously, the machines can not self destroy and are discarded. The heat-sensitive self resetting device for a safety unit has the advantages of self resetting or semi-self resetting function, repeatable use of an integral security unit, long service life and no waste.

Description

Heat-sensitive self reset device for safety unit

The present invention relates to a kind of telecommunication technology, is the self reset device in the Security Unit in the safety seat module in upright arrangement of program controlled telephone communications equipment room, and oneself resets after playing overcurrent, overvoltage protection and warning.

Safety seat module in upright arrangement one termination outside line terminal cable in the communications equipment room, the other end is connected with office cable through wire jumper, and carries out overcurrent, overvoltage protection and warning in time by Security Unit, to guarantee man-machine safety.Security Unit is with regard to its mode of connection difference, and it is different to be divided into plug-in, solderless wrapped connection formula, their profiles, with the requirement in the insertion chamber that adapts to supporting with it safety seat module.With the difference of profile, also vary in the arrangement of primary element in the Security Unit.But no matter how different profile is with the immanent structure arrangement, all over-voltage protection element need be arranged, as two utmost point discharge tubes and three utmost point discharge tubes; Temperature-sensitive element is as thermistor (PTC, together following), heat coil, fuse sheet etc.; Also have elastic component, ground path, alarm circuit etc.Traditionally with the difference of the temperature-sensitive element in the Security Unit; be divided into thermistor Security Unit and heat coil Security Unit two big classes; their common fault is after whenever carrying out overcurrent, overvoltage protection; the inner portion element melts down; cause whole Security Unit to scrap; can not reuse, the life-span is short, and waste is big.

The objective of the invention is to select to have the alloy sheet of shape memory function; make temperature-sensitive element with PTC; inherent overall structure is done corresponding arrangement; make that whenever carry out after overcurrent, overvoltage protection and the warning not can self-destruction; also can reset certainly; Security Unit can be reused, and the life-span is long, does not waste.

Realize that purpose of the present invention can adopt following measure: it is installed in parallel in the plastic casing of Security Unit in pairs, it is fixed to be welded calmly or in the circuit board by screw, reed, plastics inner clamp piece folder, form by discharge tube, thermistor and marmem sheet, discharge tube and thermistor fully contact with the marmem sheet, and the free-end of marmem sheet (section) is near the connecting and disconnecting of the circuit parts.So-called connecting and disconnecting of the circuit parts can be clutch dogs, and auxiliary body, also can be reed or contact, and this reed is costed in the distortion of marmem sheet or the contact is promptly logical, and cooling is promptly disconnected after resetting.

Purpose of the present invention also can be come perfect by following measure: there is dial hole the corresponding position with the connecting and disconnecting of the circuit parts on the shell.

Fig. 1, Fig. 2 are plug-in heat-sensitive self reset device for safety unit (no clutch dog) structural representation.

Fig. 3, Fig. 4 are plug-in Security Unit temperature-sensitive semi-self-resetting device (clutch dog is arranged) structural representation.

Fig. 5, for solderless wrapped connection formula Security Unit temperature-sensitive semi-self-resetting device (clutch dog is arranged) structural representation.

Fig. 6, for electrical schematic diagram of the present invention.

The present invention is described in detail below in conjunction with embodiment: marmem sheet, its essence are the Nitinol sheets, this sheet is made definite shape after, about a certain temperature value, can repeated deformation and complex, as if can remember original shape, so gain the name.Make temperature-sensitive element with it, have the temperature of impression, distortion complex, drive function.Shang Weijian delivered both at home and abroad in Security Unit and did thermo-sensitive material with the marmem sheet, was combined into the report of self reset device, the domestic material object of also not meeting.In Security Unit, can reach the device of heat-sensitive self reset or semi-self-resetting purpose, only need discharge tube 9, thermistor (PTC) 4,7 three kinds of primary elements of marmem sheet (hereinafter to be referred as the memory sheet) to get final product, discharge tube 9 must fully contact with memory sheet 7 with PTC4, send out 4 heats that go out fully to experience discharge tube 9 with PTC, distortion in time drives, and makes the correct break-make of circuit.Say that generally extraneous high-tension electricity enters, promptly cause discharge tube 9 discharge heatings, extraneous heavy current enters, promptly cause thermistor 4 heatings, because of above-mentioned two elements all fully contacts (meaning is to be preferably larger area directly to contact) with memory sheet 7, fully to experience the heat that they send.Experience memory sheet 7 distortion of heat, its free-end (section) flexible, or produce thrust, make switch (aunt is called clutch dog) do the break-make activity of circuit, or not by the direct on-off circuit of clutch dog, reach the disconnection dispatch from foreign news agency, the purpose of warning, ground connection.After learning that the workman of warning handles the high voltage in the external world, heavy current well, discharge tube 9, PTC4 turn cold, memory sheet 7 complex, clutch dog 12 is arranged, stir with the workman and to reset, by clutch dog, memory sheet 7 is by the i.e. break-make voluntarily of distortion complex of self, return to original initial state, reach the purpose of runback.

The plastic casing 1 of whole Security Unit, required inlet wire reed (or contact) 8, outlet reed (contact) 3, warning reed (contact) 6, the grounding reed (contact) 5 of dispatch from foreign news agency turnover, and relevant interior external circuit etc. all is a known technology, it is " heat-sensitive self reset device " part in addition of indication of the present invention, though the overall process of the runback activity of this device, be related with above-mentioned known technology, and these contacts, the layout of relevant parts all is that industry those of ordinary skill need not spend creative work and can realize in the known technology.But in order to say something, below every embodiment, the combination of above-mentioned known technology and this device is introduced in the lump with working condition.

Embodiment 1: what for example accompanying drawing 1, Fig. 2 were represented is that plug-in does not have the auxiliary on-off circuit schematic diagram of clutch dog.U font memory sheet 7 center fixed, dual-side respectively with discharge tube 9 and PTC4 near, extraneous normal voltage, electric current are entered by the inlet wire reed, through memory sheet 7 to PTC4, go out from outlet reed 3.When there is heavy current in the external world when the inlet wire reed enters, reach PTC4, make its heating, this heat makes the memory sheet distortion near its side, free section or interior receipts (Fig. 1) or outer bullet (Fig. 2) touch the grounding reed 5 and the warning reed 6 that are adjacent, simultaneously extraneous heavy current are disconnected (Fig. 1), though or do not disconnect but ground connection (Fig. 2) realization disconnection, warning, ground connection purpose.Enter when there is high voltage in the external world, most earth electrode by discharge tube 9 flows out, and causes discharge tube 9 discharge heatings simultaneously immediately, makes the memory sheet 7 of experiencing this heat that the action the same with heavy current take place and changes, and reaches the purpose of warning, disconnection, ground connection.If external voltage, electric current recover normal, discharge tube 9 and PTC4 turn cold, and with its memory sheet 7 complex that fully contact, all are in initial state, for next time overcurrent, overvoltage protection and warning are prepared.

Embodiment 2: the plug-in that Fig. 3 and Fig. 4 represent has clutch dog 12 auxiliary on-off circuit schematic diagrames.The thrust that produces during 7 temperature distortions of memory sheet makes clutch dog 12 on-off circuits of on-off action.Fig. 3 represents to remember the thrust of sheet 7 temperature distortions, makes clutch dog 12 produce displacement of the lines, makes from the inlet wire contact to move on earthing contact and the alarm actuating contact.And Fig. 4 represents the clutch dog 12 of another form, and the thrust of memory sheet 7 temperature distortions makes clutch dog 12 produce angular displacement, also moves to earthing contact 5 and alarm actuating contact 6 from former inlet wire contact 8, reaches disconnection, ground connection, warning purpose.Wherein the circulation of dispatch from foreign news agency, high pressure, heavy current enter and cause discharge tube, PTC heating, and the distortion of memory sheet 7 etc. are all with embodiment 1.But with not existing together of embodiment 1 be: dispatch from foreign news agency recovers normal, and discharge tube 9 and PTC4 turn cold, and after memory sheet 7 complex, needs with manpower clutch dog 12 to be allocated to original position and resets, so can be described as semi-self-resetting.Therefore have dial hole 11 on the shell 1.More than two embodiment all represent structure, the working condition of plug-in Security Unit heat-sensitive self reset or semi-self-resetting device.

Embodiment 3: the installation situation of the heat-sensitive self reset device in the accompanying drawing 5 expression solderless wrapped connection formula Security Units, what it was different with plug-in is: inner two groups of components identical are arranged in parallel, and are symmetrical mutually, and do not adopt the wiring board technology.And the inner two groups of components identical of plug-in Security Unit are that in-line is arranged, and symmetrical mutually, elements such as discharge tube 9, PTC4 are welded on the wiring board 10.The also available clutch dog of solderless wrapped connection formula and without two kinds of structures of clutch dog, thus semi-self-resetting and two kinds of situations of runback are arranged equally.Accompanying drawing 5 is situations that clutch dog 12 is arranged.Extraneous heavy current from the inlet wire contact pin to inlet wire reed hypomere 17, to sliding reed 15, arrive inlet wire reed epimere 13 again, make the PTC4 heating, 7 temperature distortions of L font memory sheet promote clutch dog 12 and glide, the downslide of the clutch dog that this is wide at the top and narrow at the bottom, splayed is touched receive in the Eight characters of spring 14 and the cap portion of ground connection contact pin 16 under touching in it, realize the purpose of warning, ground connection, when clutch dog 12 glides, the sliding reed 15 in fastening its outside glides thereupon, makes with inlet wire reed epimere to break away from, and reaches the purpose that disconnects extraneous heavy current.Run into that extraneous forceful electric power is pressed, then most of earth electrode by discharge tube 9 flows out, cause discharge tube 9 discharge heatings simultaneously, memory sheet distortion back produces above-mentioned same case.Extraneous electric current is normal, and clutch dog is manual to be dialled back.

Fig. 6 is this device electrical schematic diagram, and A and B represent the inlet wire point, A ' and B ' expression outlet point, and E is an earth point, S is for reporting to the police 4 expression PTC, 9 expression discharge tubes, expression memory sheet and clutch dog in the rectangle dotted line.Extrinsic current is normal, and electricity is entered by A, B, to memory sheet, discharge tube 9, PTC4, is gone out by A ', B '.If meet overvoltage, overcurrent electricity, then A, B enter, and make discharge tube 9, PTC4 heating, and the clutch dog displacement is moved or promoted in the distortion of memory sheet, and former circuit disconnects and touching with warning S, earth point E simultaneously, realizes the purpose of warning, ground connection, disconnection.Extraneous electric current, voltage are normal, discharge tube 9, PTC4 cooling, and the memory sheet is from resetting, and whole circuit recovers initial state.

There is import in shape memory alloy material China, and Jiangsu one tame Materials Research Laboratories also has production commercially available.Discharge tube can be with two diodes or one three former pipe, and thermistor (PTC), light-emitting diode etc. all are commercially available.Its specifications and models are that the industry is known with the people.

The present invention carries out overcurrent, overvoltage protection and actuation of an alarm one time whenever, effectively protect man-machine safe the time, can self-destruction and discard, have runback or semi-self-resetting function, make whole Security Unit reusable, the life-span is long, does not waste.

Claims (2)

1. heat-sensitive self reset device for safety unit, be installed in parallel in pairs in the plastic casing (1) of Security Unit, fixed or to go up weldering at wiring board (10) fixed by partition (2) folder in reed or the plastics, it is characterized in that it is made up of discharge tube (9), thermistor (4), marmem sheet (7), discharge tube (9) and thermistor (4) all contact with marmem sheet (7), and the free-end (section) of this sheet (7) is near the connecting and disconnecting of the circuit parts.

2. device as claimed in claim 1 is characterized in that said shell (1) is gone up and there is dial hole (11) connecting and disconnecting of the circuit parts corresponding position.

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