CN2779592Y - Power-off self-replacement security unit - Google Patents

Abstract

The utility model relates to an open-circuit self-reset security unit, which solves the problems that the existing security unit can not be used repeatedly, etc. in the utility model has the structure that a metal sheet is clamped between two discharge tubes, the top end of the metal sheet is butted with the first end of a sliding body and the second end of the sliding body is provided with a compression spring. When the utility model works normally, a first and a second external line sheets are in good contact with a left and a right elastic sheets, and the sliding body gradually enlarges from the fist end to the second end, so sliding body can be pulled by the spring to slide towards the first end. Then the left and the right elastic sheets can be pulled to both sides by the sliding body, so the first and the second external line sheets are respectively disengaged with the left and the right elastic sheets which are connected with a ground wire through the sliding body and the metal sheet. After the over voltage is removed, a convex column arranged on the sliding body is toggled by a hand. The sliding body can be restored to normal position to be put into service again.

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.

Summary of the invention

At the above-mentioned defective of existing technology, existing Security Unit to be solved in the utility model can not reuse, maybe need change fuse could reuse, and may not have the problem of alarm signal when big current open protection.

In order to solve the problems of the technologies described above, the utility model provides a kind of open circuit self-resetting type Security Unit, first, second discharge tube is housed in its housing, can be when being heated towards the sheet metal of predetermined direction distortion, the gliding mass of surface conductance, be used to introduce first, second outside line sheet of lead-in wire, with the left and right shell fragment of described first, second outside line sheet composition switch; Wherein, described sheet metal is sandwiched between described two discharge tubes, and described first, second outside line sheet lays respectively at the both sides of described two discharge tubes; First end of described gliding mass is provided with first, second step, and the top of described sheet metal can withstand on described first or the second step place, and second end of described gliding mass is equipped with can be with its compression spring that promotes to first end; Described first, second outside line sheet well contacts with left and right shell fragment respectively during operate as normal; First end of described gliding mass increases gradually to second end, can move on to second step from the first step of gliding mass during described sheet metal temperature distortion, described gliding mass can be promoted by spring and slide to first end, the both sides of described gliding mass can promote the top of left and right shell fragment to both sides, described first, second outside line sheet is disengaged with left and right shell fragment respectively, and described left and right shell fragment is connected with ground wire with sheet metal through described gliding mass.

In the utility model, described sheet metal can be bimetal leaf or memorial alloy; Can establish one and be used for projection that it is resetted on described gliding mass, described projection reaches the outside in described housing.Described left and right shell fragment also can be connected with first, second interior lines through thermistor respectively.

In the utility model, also comprise an alarm light-emitting diode, its positive pole is connected in the signal shell fragment, and negative pole is connected in signal patch; Spring, gliding mass and described sheet metal after but described signal shell fragment warp-wise first end moves are connected with ground wire.

Owing to having adopted above-mentioned technology, after Security Unit is finished once protection action, only need gliding mass is pushed back original position, can realize automatically resetting and the overlapping investment use.Therefore solve existing Security Unit and can not reuse, maybe need to upgrade fuse and could reuse, and when current open is protected greatly, may not have the problem of alarm signal.

Description of drawings

Below in conjunction with embodiment and accompanying drawing the utility model is elaborated, in the accompanying drawing:

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

Fig. 2 A and Fig. 2 B are the profile schematic diagrames of open circuit self-resetting type Security Unit in preferred embodiment of the utility model;

Fig. 3 is the cutaway view of Fig. 2;

Fig. 4 is that the Security Unit among Fig. 3 removes B behind the left shell to view;

Fig. 5 is the schematic diagram of the open circuit self-resetting type Security Unit among Fig. 3 when being in normal condition;

Fig. 6 is that open circuit self-resetting type Security Unit among Fig. 3 is because of the schematic diagram of overvoltage after moving.

Embodiment

A preferred embodiment of the present utility model such as Fig. 2 are to shown in Figure 6.As can be seen from the figure, bimetal leaf 10 is sandwiched between the discharge tube 13, the top of bimetal leaf 10 a bit of bending has been arranged 180 the degree, the circular arc on this top can upwards push away gliding mass 7.The lower end of bimetal leaf 10 then with ground wire 14 clampings.As can be seen from Figure 3, spring 6 is compressed between catch 5 and the gliding mass 7, and wherein, catch 5 is fixed, and 7 of gliding masses can be promoted by spring 6 and to lower slider.Light-emitting diode 1 positive pole is connected in signal shell fragment 3, and negative pole then is connected in signal patch 4, and when signal shell fragment 3 ground connection, light-emitting diode 1 is luminous.

As can be seen from Figure 3, the first outside line sheet 11, the second outside line sheet 12 are formed linked switches with left shell fragment 9, right shell fragment 8 respectively, and are connected to first interior lines 15, second interior lines 16 through separately thermistor 18 respectively.Wherein, left shell fragment 9, right shell fragment 8 are also through discharge tube 13, bimetal leaf 10 and be connected with ground wire 14.

As shown in Figure 5, during operate as normal, bimetal leaf 10 is the normal shape that does not produce distortion, its top circular arc withstands on the first step place of gliding mass 7, make gliding mass 7 remain the state shown in Fig. 5, at this moment, the first outside line sheet 11, the second outside line sheet 12 keep good electrical contact with left shell fragment 9, right shell fragment 8 respectively, thereby can be with normal connection of realizing between outside line and the interior lines.

As shown in Figure 3, when outside line runs into non-instantaneous overvoltage, discharge tube 13 long-time discharge heatings, its heat transferred are to bimetal leaf 10, and generation bending distortion can make it to be heated, it in the present embodiment distortion of bending to the right, at this moment, the top of bimetal leaf 10 can break away from the first step of gliding mass (7), and the chute of gliding mass 7 in the effect lower edge of spring 6 housing 2 moved down, as shown in Figure 6, the top of bimetal leaf 10 is withstood on the second step of gliding mass 7.Therefore, be that the top of bimetal leaf 10 breaks away from that moment situation from the first step that breaks away from gliding mass (7) shown in Fig. 3.

In the present embodiment, the inside of gliding mass 7 can be made by plastic parts, plates conducting metal on its surface then, just with the surface metalation of plastic parts.As shown in Figure 6, when gliding mass 7 moved down, its inclined-plane, left and right sides can push away left shell fragment 9 to the right, right shell fragment 8 pushes away left, made them break away from and be connected respectively with between the first outside line sheet 11, the second outside line sheet 12, thereby will disconnect between outside line and the interior lines, formed open-circuit-protection; Simultaneously, left shell fragment, right shell fragment also are connected with ground wire 14 with bimetal leaf 10 through gliding mass 7, thereby realize the interior lines ground protection.

Meanwhile, after gliding mass 7 moves down, spring discharges, contact with the signal shell fragment 3 that is connected in light-emitting diode 1 positive pole, at this moment, the signal shell fragment 3 of light-emitting diode 1 positive pole is connected to ground wire 14 through spring, gliding mass 7 and bimetal leaf 10, because the negative pole of light-emitting diode 1 connects negative supply by signal patch 4, so light-emitting diode 1 electrified light emitting is realized luminous alarm function.

After the overvoltage in the outside line is got rid of, only need promotion gliding mass 7 to make it to move up and get final product, as can be seen from Figure 3, be provided with a projection 71 on the surface of gliding mass, this projection can reach the outside of housing 2, the operator can manually it upwards be pushed away, thereby make gliding mass return to position shown in Figure 4, because this moment, discharge tube 13 no longer generated heat, bimetal leaf 10 will revert to normal condition shown in Figure 5, that is to say, can be stuck in the first step place of gliding mass 7 again, be locked once more.

Claims (5)

1, a kind of open circuit self-resetting type Security Unit, first, second discharge tube (13) is housed in its housing (2), can be when being heated towards the sheet metal (10) of predetermined direction distortion, the gliding mass of surface conductance (7), be used to introduce first, second outside line sheet (9,8) of lead-in wire, with the left and right shell fragment (11,12) of described first, second outside line sheet composition switch; It is characterized in that,

Described sheet metal is sandwiched between described two discharge tubes, and described first, second outside line sheet lays respectively at the both sides of described two discharge tubes; First end of described gliding mass is provided with first, second step, and the top of described sheet metal can withstand on described first or the second step place, and second end of described gliding mass is equipped with can be with its compression spring (6) that promotes to first end; Described first, second outside line sheet well contacts with left and right shell fragment respectively during operate as normal;

First end of described gliding mass increases gradually to second end, can move on to second step from the first step of gliding mass during described sheet metal temperature distortion, described gliding mass can be promoted by spring and slide to first end, the both sides of described gliding mass can promote the top of left and right shell fragment to both sides, described first, second outside line sheet is disengaged with left and right shell fragment respectively, and described left and right shell fragment is connected with ground wire (14) with sheet metal through described gliding mass.

2, open circuit self-resetting type Security Unit according to claim 1 is characterized in that, also is provided with one and is used for its projection that resets (71) on described gliding mass, and described projection reaches the outside in described housing.

3, open circuit self-resetting type Security Unit according to claim 1 is characterized in that, described left and right shell fragment is connected with first, second interior lines through thermistor respectively.

4, open circuit self-resetting type Security Unit according to claim 1 is characterized in that, also comprises alarm light-emitting diode (1), and its positive pole is connected in the signal shell fragment, and negative pole is connected in signal patch; Spring, metal gliding mass and described sheet metal after but described signal shell fragment warp-wise first end moves are connected with ground wire.

5, according to each described open circuit self-resetting type Security Unit among the claim 1-4, it is characterized in that described sheet metal is bimetal leaf or memorial alloy.

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