CN2805068Y - Open-circuit self-restoring type protector unit - Google Patents

Abstract

The utility model relates to an open-circuit self-restoring type protector unit. In order to solves the problem that an external line reed and an alarm circuit can be switched on at the instant that an external line is switched off existing in the prior similar products, the utility model has the structure that the inner part of a casing is provided with an insulation slide block and a spring driving the insulation slide block to move, and the side surface of the slide block is provided with an external line connecting sheet. The bending structure arranged at the front end of a metal sheet which can deform towards the preset direction when heated can overcome the action of the spring and hook the slide block, so the external line connecting sheet can keep in good contact with the external line reed and an elastic sheet. The heat released by an overvoltage protection device can cause that the metal sheet is heated to deform and release the slide block, so the slide block can drive the external line connecting sheet to move together under the action of the spring. Consequently, the external line connecting sheet and the elastic sheet are disconnected, and an alarm sheet arranged on the slide block is communicated with an alarm connecting sheet of an alarm indicating light arranged on a casing. When the failure is confirmed to be excluded, the normal operation of the whole protector unit can be restored by a push rod which is pushed and arranged at the front end of the slide block.

Description

Open circuit self-resetting type Security Unit

Technical field

The utility model relates to the Security Unit that uses in the communication equipment, particularly a kind of open circuit self-resetting type Security Unit that is used on the main frame.

Background technology

Main frame is as a kind of corollary equipment in the communication line, and the one side connects external cable, and opposite side is connected with switch by internal subscriber cable, has functions such as distribution, protection, test and fault warning.Security Unit is an important component part of main frame, and the reliability of its quality and technology plays crucial effects to protection intra-office equipment and attendant's personal safety.

The circuit theory of a kind of Security Unit of the prior art as shown in Figure 1, when overcurrent occurring in the circuit, thermistor (PTC1 or PTC2) can produce high resistant in the line, thereby plays overcurrent protection.When (for example 220V power line overlap joint) appears in overvoltage, discharge tube (SA1 or SA2) conducting, electric current is released into ground by discharge tube.Size according to the line-to-ground electric current, can be divided into following two kinds of situations: when line-to-ground electric current when less (as less than 10A), fuse (FUSE1) is failure to actuate, the discharge tube release heat makes fail safe switch (K1 or K2) action, the light-emitting diode electrified light emitting that is attached thereto and produce alarm signal, but can not disconnect inside and outside circuit (a, b outside line among the figure, a ', b ' are interior lines); When line-to-ground electric current when big (as greater than 10A); fuse (FUSE1) fuses immediately; play the open-circuit-protection effect; but because its fusing time is very short, the heat that discharge tube discharges may deficiency make the fail safe switch produce action, so can not produce alarm signal; consequently the room management personnel can not in time find line fault; can only passive wait subscriber complaint, simultaneously owing to have high pressure in the circuit all the time and, safety of operators had certain influence with nowhere to turn to alert signal.And fuse wherein is in case fusing back is just irrecoverable, could reuse after can only disposablely using or change again fuse, yet for the user, take apart whole Security Unit change again fuse be bother very much, unlikely realization.

At present, more existing producers have developed some self-resetting type Security Units at the problems referred to above, are in the utility model patent of ZL03221977.6, ZL02248903.7 and ZL03221264.X in the patent No. for example, all disclose similarly Security Unit.Their common feature is, its outside line directly is connected with interior lines, and when overvoltage or overcurrent took place, utilizing when being heated can be towards the sheet metal (or similar device) of predetermined direction distortion when connecting the alarm loop, disconnect being connected between outside line and the interior lines, thereby realize the open circuit alarm function.But still there is a great defective in they: in the moment that disconnects outside line, sheet metal can be connected outside line reed and alarm loop and form short circuit, thereby may cause damage to equipment, also may cause certain injury to the person.

The utility model content

At the defective that exists in the prior art, the utility model will solve in the existing self-resetting type Security Unit and internal and external line reed and alarm loop can be connected and the formation short circuit at the moment sheet metal that disconnects outside line, thereby can cause the problem of device damage or personal injury.

The scheme that is adopted that the utility model solves its technical problem is: a kind of open circuit self-resetting type Security Unit is provided, in its housing, be provided with the outside line reed that is used to introduce outside line, in described housing, shell fragment can be connected with ground strip towards the sheet metal of predetermined direction distortion when being heated through the overvoltage protection device; It is characterized in that, an insulation slide block also is housed in described housing and can orders about the spring that it moves to first end, the outside line brace is housed in the side of described slide block; The front end of described sheet metal is a bending structure, and described bending structure can overcome the effect of described spring and described slide block is caught on, and makes described outside line brace keep well contacting simultaneously with between described outside line reed and the shell fragment; The heat that described over-voltage protector discharges can make described sheet metal temperature distortion and discharge described slide block; described d/d slide block can drive described outside line brace and move to first end together under the effect of described spring, be connected thereby make to disconnect between described outside line brace and the shell fragment.

In the utility model, also can be provided with one at first end of described slide block and be used for push rod that it is resetted, described push rod reaches the outside in described housing.

In the utility model, also an alarm indicator can be set on described housing, an end of described alarm indicator is connected with signal patch, and the other end is connected with the alarm brace; Also be provided with an alarm sheet on described slide block, described alarm sheet is connected with described ground strip through described spring, sheet metal; Described d/d slide block can drive described alarm sheet and move to first end together under the effect of described spring, thereby makes described alarm sheet can and alarm between the brace and connect.

In the utility model, described shell fragment also is connected with the interior lines reed through the overcurrent protection device.

In the utility model, the quantity of described outside line reed, shell fragment, interior lines reed, over-current protection device and over-voltage protector preferably all is two, and is that the center is symmetrical arranged with described sheet metal.

In the utility model, described over-current protection device can be thermistor or other can realize the device of same function; Described over-voltage protector can be solid discharging tube, gas discharge tube, integrated package or other can realize the device of same function; Described sheet metal can be bimetal leaf or memorial alloy.

Owing to adopted such scheme; open circuit self-resetting type Security Unit of the present utility model is in the process of whole open-circuit-protection action; insulated all the time slide block separates between its outside line reed and the alarm loop; so between outside line reed and the alarm loop problem of instantaneous short circuit can not take place, thereby can thoroughly solve defective of the prior art.After open circuit self-resetting type Security Unit action of the present utility model, can realize open-circuit-protection to intra-office equipment and personal safety, and send the continuous and reliable alarm signal; After confirming that fault has been got rid of, can recover the worker again by hand-reset and often work, and need not change.

Description of drawings

Below in conjunction with drawings and Examples the utility model is elaborated:

Fig. 1 is the circuit theory diagrams of a kind of Security Unit of the prior art;

Fig. 2 is core motion device--the enlarged diagram of slide block assembly in preferred embodiment of the utility model;

Fig. 3 is that the A of Fig. 2 is to view;

Fig. 4 is the schematic diagram when being unkitted slide block assembly and cover plate in the open circuit self-resetting type Security Unit in preferred embodiment of the utility model;

Fig. 5 is with the schematic diagram after in the slide block assembly load map 4 shown in Figure 2;

Fig. 6 is the schematic diagram of the slide block among Fig. 5 when being discharged by sheet metal.

Embodiment

A preferred embodiment of the present utility model such as Fig. 2 are to shown in Figure 6.From figure Fig. 2 and Fig. 3 as can be seen, a use therein core motion device is a slide block assembly 2, it by slide block 3, symmetrical outside line brace 4 and the alarm sheet 5 that is used to connect alarm indicator (light-emitting diode 16) form.Wherein, outside line brace 4 and alarm sheet 5 are all made by conductive metal, and are flush-mounted in independently of each other in the slide block of being made by insulating material 3.

As Fig. 4, Fig. 5 and shown in Figure 6, in the present embodiment, by slide block assembly 2, housing 6, outside line reed 7, interior lines reed 8, shell fragment 9, signal patch 10, ground strip 11, discharge tube 12, thermistor 13, alarm brace 14, spring 15, light-emitting diode 16, bimetal leaf 17 and loam cake (not drawing in the drawings) etc., form an open circuit self-resetting type Security Unit.

As shown in Figure 5, under the normal condition, the right part bending structure of bimetal leaf 17 can catch on slide block assembly 2, makes it can overcome the effect of spring 15 and can not move right; At this moment, connect by one on the slide block assembly 2 (being positioned at upside among Fig. 4) outside line brace 4 between the outside line reed 7 on top and the shell fragment 9, then connect between the outside line reed of bottom and the shell fragment by another outside line brace on the slide block assembly 2; Shell fragment 9 is connected with interior lines reed 8 by thermistor 13 again, forms the operate as normal circuit.On the other hand, discharge tube 12 is connected with ground strip 11 by bimetal leaf 17; Alarm sheet 5 is connected with bimetal leaf 17 by spring 15; The positive pole of light-emitting diode 16 is connected on the alarm brace 14, and negative pole is connected on the signal patch 10; And be off-state between alarm brace 14 and the alarm sheet 5 under the normal condition, light-emitting diode 16 can not send alarm signal.

As shown in Figure 6, when on the outside line reed 7 false voltage being arranged, false voltage enters discharge tube 12 by outside line brace 4, discharge tube 12 can generate heat because of overcurrent, and heat passed to bimetal leaf 17, make bimetal leaf 17 be heated and produce distortion, be then to be opposite direction distortion in this example, thereby make slide block assembly 2 can break away from its restriction towards its bending according to predetermined direction.At this moment, slide block assembly 2 can be toward right motion under the effect of spring 15, make the alarm sheet 5 in the slide block assembly 2 connect with alarm brace 14, light-emitting diode 16 is switched on and is sent lasting alarm signal (in the present embodiment, what the negative pole of light-emitting diode 16 connected is negative supply, and positive pole then is connected with ground strip 11 through alarm brace 14, alarm sheet 5, spring 15, bimetal leaf 17).Simultaneously, outside line brace 4 moves right together along with slide block assembly 2 and breaks away from outside line reed 7 and to be connected, make to disconnect between outside line reed 7 and the shell fragment 9 to be connected, thus the realization open-circuit-protection.

After above-mentioned open-circuit-protection action; because slide block assembly 2 moves right; its top push rod 20 can be exposed to the outside of Security Unit; when the fault on confirming circuit has been got rid of, because this moment, bimetal leaf reverted to normal condition, so as long as gently push rod 20 is pressed back left; bimetal leaf 17 promptly can catch on slide block assembly 2 once more; make whole Security Unit return to normal operating conditions, and do not need to change another Security Unit, or the parts in the replacing Security Unit.

In the present embodiment; in the process of whole open-circuit-protection action; outside line reed 7 separates with the insulated all the time slide block 3 in alarm loop, thus the problem of instantaneous short circuit can not take place between outside line reed 7 and the alarm loop, thus can thoroughly solve defective of the prior art.

After the open circuit self-resetting type Security Unit action of the present utility model, can realize open-circuit-protection to intra-office equipment and personal safety, and send the continuous and reliable alarm signal; After confirming that fault has been got rid of, can recover the worker again by hand-reset and often work, and need not change.

Under the prerequisite that guarantees same function and effect, the shape of each parts in the foregoing description, position, compound mode etc. can be carried out suitable adjustment according to different needs.In addition, discharge tube 12 wherein can be solid discharging tube, gas discharge tube, and also available integrated package or other over-voltage protectors that can realize same function replace.The also available over-current protection device that other can realize same function of thermistor 13 wherein replaces.Bimetal leaf 17 wherein can be other alloy bodies with following characteristic: have certain elasticity, toughness and intensity, can produce distortion when being heated, and can control the direction of its distortion, for example memorial alloy according to designer's requirement.

Claims (7)

1, a kind of open circuit self-resetting type Security Unit, in its housing (6), be provided with the outside line reed (7) that is used to introduce outside line, in described housing, shell fragment (9) can be connected with ground strip (11) towards the sheet metal (17) of predetermined direction distortion when being heated through overvoltage protection device (12); It is characterized in that,

An insulation slide block (3) also is housed in described housing and can orders about its spring that moves to first end (5), outside line brace (4) is housed in the side of described slide block; The front end of described sheet metal is a bending structure, and described bending structure can overcome the effect of described spring and described slide block is caught on, and makes described outside line brace keep well contacting simultaneously with between described outside line reed and the shell fragment;

The heat that described over-voltage protector discharges can make described sheet metal temperature distortion and discharge described slide block; described d/d slide block can drive described outside line brace and move to first end together under the effect of described spring, be connected thereby make to disconnect between described outside line brace and the shell fragment.

2, open type runback Security Unit according to claim 1 is characterized in that, also is provided with one at first end of described slide block and is used for its push rod that resets (20), and described push rod reaches the outside in described housing.

3, open type runback Security Unit according to claim 2 is characterized in that, also is provided with an alarm indicator (16) on described housing, and an end of described alarm indicator is connected with signal patch (10), and the other end is connected with alarm brace (14); Also be provided with an alarm sheet (5) on described slide block, described alarm sheet is connected with described ground strip through described spring, sheet metal; Described d/d slide block can drive described alarm sheet and move to first end together under the effect of described spring, thereby makes described alarm sheet can and alarm between the brace and connect.

4, open circuit self-resetting type Security Unit according to claim 3 is characterized in that, described shell fragment also is connected with interior lines reed (8) through the overcurrent protection device.

5, open circuit self-resetting type Security Unit according to claim 4 is characterized in that, the quantity of described outside line reed, shell fragment, interior lines reed, over-current protection device and over-voltage protector all is two, and is that the center is symmetrical arranged with described sheet metal.

6, open circuit self-resetting type Security Unit according to claim 5 is characterized in that, described over-current protection device is a thermistor; Described over-voltage protector is a discharge tube.

7, according to each described open circuit self-resetting type Security Unit among the claim 1-6, it is characterized in that described sheet metal is bimetal leaf or memorial alloy.

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