CN2247903Y

CN2247903Y - Protection unit for safety protector

Info

Publication number: CN2247903Y
Application number: CN 95219233
Authority: CN
Inventors: 谢金龙
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-31
Filing date: 1995-07-31
Publication date: 1997-02-19
Anticipated expiration: 2005-07-31

Abstract

The utility model relates to a protection unit for a safety protector, comprising a case. The top of the case is provided with an alarm indicating lamp, and the interior is provided with a circuit board. A thermistor, a discharging lightning protection tube and an alarm indicating lamp are arranged in the circuit of the circuit board. A conductive clamping piece is clung to the upper side of the thermistor. A bottom pad of the thermistor is correspondingly provided with a tin bar which can be fused by high temperature, and the bottom pad is connected with a signal copper foil. The conductive clamping piece, the thermistor and a tin sheet form a signal loop circuit. An alarm copper foil and a ground copper foil are formed corresponding to the upper and the lower positions of the circuit board of the tin bar. When the thermistor meets high temperature, the tin bar is fused, and the bottom surface of the thermistor is contacted with the alarm copper foil, the signal copper foil and the ground copper foil. Therefore, the alarm indicating lamp is turned on.

Description

The protected location of protector

The utility model relates to a kind of protector, and particularly a kind of protected location that is connected the protector of the telephone exchange between outside line and the switch damages with the not reason thunderbolt of protection telephone exchange, abnormal voltage and overcurrent effect.

The protected location of protector now; its internal circuit as shown in Figure 5; be at outside line LT; LR and switchboard circuit DT; cross-over connection has the lightning-arrest pipe 60 of discharge and be serially connected with thermistor 40 (PTCR) respectively on two signal near exchanger side between the DR; and can be at outside line LT; when LR is struck by lightning; lightning-arrest pipe 60 arrives ground through discharging; reach and avoid high-voltage signal to be fed through in the switch; and thermistor 40 (PTCR) also can be excessive and produce the off state that presents high impedance when overheated at circulating current; loop with automatic cut-out switch; reach the excellent protection effect; and manage 60 after suffering that the civil power high pressure produces the short circuit effect when attacking owing to discharge is lightning-arrest; promptly lost efficacy and to use; so need whole replaceable security module is fallen; therefore; at the step switch FS that promptly is formed with interlock corresponding to the lightning-arrest pipe of discharge 60 positions; can be after the continuous discharge of civil power high pressure at the lightning-arrest pipe 60 of discharge; can make two groups of step switch FS ground connection and connections simultaneously that are connected across between outside line LTLR and the ground wire that alarm indicator 22 is lighted automatically; whether the attendant can be gone out by the point of the alarm indicator on the protected location of protector 22 learn whether it need change; the effect of being convenient to keep in repair is provided; but the concrete structure between lightning-arrest pipe 60 of above-mentioned discharge and step switch FS; be to belong to conventional art, so do not repeat them here.

Yet in the circuit with the protected location of above-mentioned traditional protector; though have the effect of fault alarm at the lightning-arrest pipe 60 of discharge; but it is only applicable to line voltage distribution and surpasses 230 volts occasion; that is when being lower than 230 volts for unusual induced voltage; 60 of lightning-arrest pipes of discharge can't regular event; then this induced voltage will enter switch; and generation abnormal current; to cause thermistor to be high impedance and be off state this moment, and produce abnormal high temperature, but there is no corresponding fault alarm effect for thermistor 40; therefore; inefficacy just has no way of knowing for thermistor, only can inform just can chase after to combine by the user to find, and obviously has and gives improved necessity again.

Main purpose of the present utility model is: provide a kind of anomaly that occurs to alarm; the protected location of the protector that the circuit element inefficacy also can be alarmed; the main protected location that improves the conventional security protector can't provide the defective of thermistor fault alarm; promptly set up related device at the thermistor relevant position; when it can surpass a specified temp in the surface temperature of thermistor; just can connect the alarm loop automatically and alarm indicator is lighted, break down to represent it.

For achieving the above object, the utility model is taked following technical scheme:

The protected location of protector of the present utility model comprises that a top is formed with the housing of alarm indicator, and inside is provided with a circuit board; Its circuit is combined with thermistor, the lightning-arrest pipe of discharge and described alarm indicator, it is characterized in that:

Be posted by connecting with a conductive clip above corresponding to described thermistor at described circuit board, conductive clip communicates with home loop; Be lined with one in the bottom surface of thermistor and run into the fusible block tin of high temperature, and be connected with a signal Copper Foil, to utilize conductive clip, thermistor, tin sheet to constitute signal circuit, form an alarm Copper Foil that is connected with alarm indicator and a ground connection Copper Foil in circuit board upper and lower position corresponding to the block tin place;

When thermistor ran into high temperature, described block tin melted and makes the thermistor bottom surface contact described alarm Copper Foil, signal Copper Foil and ground connection Copper Foil, and alarm indicator is lighted.

Described conductive clip is connected with a signal Copper Foil of circuit board.

Described conductive clip cross section can be L-shaped.

The cross section of described block tin can be the T font.

The trepanning of locating with being formed with on the signal Copper Foil that described block tin contacts that a narrow end for described block tin is inserted in.

The protected location of protector of the present utility model has following effect:

The utility model is owing to establish a conductive clip above the thermistor position; be lined with one in the bottom surface of thermistor and run into the fusible block tin of high temperature; and the signal Copper Foil that is connected signal end again with connects; utilize conductive clip; thermistor; the tin sheet constitutes signal circuit; when losing efficacy, thermistor also can send alarm signal; make the protected location of protector have dual warning functions such as the fault alarm of the lightning-arrest pipe of discharge and thermistor overheating failure concurrently; and when the thermistor overheating failure; by a step switch with the direct ground connection of outside line; more provide in good time signal ground to enlarge, improved practicality of the present utility model to avoid damaging.

Further specify specific structural features of the present utility model and purpose below in conjunction with accompanying drawing.

Brief Description Of Drawings:

Fig. 1 is a sectional perspective exploded view of the present utility model.

Fig. 2 is a combination section of the present utility model.

Fig. 3 is an action schematic diagram of the present utility model.

Fig. 4 is an equivalent circuit diagram of the present utility model.

Fig. 5 is the equivalent circuit diagram of the protected location of traditional protector.

As shown in Figure 1; the utility model is the protected location that the top is formed with the protector of alarm indicator 22; wherein in housing 10 inside; that is on corresponding to circuit board 20, two thermistors 40 are distinguished clampings on circuit board 20 surfaces with two L-shaped conductive clips 50; the rear end of conductive clip 50 abuts against at rear, circuit board 20 top; and communicate with home loop; so that the signal circuit of back of circuit board can be fed through each thermistor 40 through conductive clip 50; and promptly form an alarm Copper Foil 21 from top to bottom in regular turn corresponding to circuit board 20 surfaces of each thermistor 40; an one signal Copper Foil 25 and a ground connection Copper Foil 23; and signal Copper Foil 25 central authorities that are positioned at the centre position form a trepanning 24; and promptly insert the block tin 30 that a cross section is the T font in each thermistor 40 bottom surface; promptly locate with trepanning 24 fits at the projection position of block tin 30 bottom surfaces; and after the previous constructions combination; be shown in the sectional side view of Fig. 2; utilize block tin 30 to make thermistor 40 bed hedgehoppings and be spaced from each other with circuit board 20; at this moment; normal signal can be through conductive clip 50; thermistor 40; block tin 30 and signal Copper Foil 25 through Fig. 1 trepanning 24 peripheries is communicated with; and Fig. 2 forms annular than the below; be lightning-arrest pipe 60 of traditional discharge and relevant peripheral construction; but this non-feature of the present utility model place is so will not give unnecessary details.

When thermistor 40 suffers the external high function of current; promptly cause high temperature and present high resistance; when temperature surpasses rated temperature; can make block tin 30 fusions that are positioned at the below; and the effect of block tin 30 bed hedgehoppings is disappeared; as shown in Figure 3; even touching simultaneously, the bottom surface of thermistor 40 is positioned at; the alarm Copper Foil 21 of upper/lower positions and ground connection Copper Foil 23 reach the signal Copper Foil 25 with middle position; so thermistor 40 surfaces are under the electric action; promptly utilize ground connection Copper Foil 23 to make alarm Copper Foil 21 all be ground state with signal Copper Foil 25; and the alarm indicator 22 that alarm Copper Foil 21 is just connected Fig. 1 housing 10 tops once ground connection is lighted; reach and show that thermistor 40 has broken; and need change the whole protecting unit; and the equivalent circuit that above-mentioned structure forms as shown in Figure 4; its traditional circuit that is different from Fig. 5 promptly is to increase aforementioned each Copper Foil 21; 23; 25; the formed step switch FS of block tin and thermistor; and alarm signal 21 be connected in parallel especially existing discharge lightning-arrest pipe 60 step switch loops and with 22 one-tenth same loops of alarm indicator; so make the utility model have dual warning functions such as the fault alarm of the lightning-arrest pipe of discharge and thermistor overheating failure concurrently; and when aforementioned thermistor 40 overheating failures; also pass through its step switch FS in the lump with the direct ground connection of outside line, more provide in good time signal ground to enlarge to avoid damaging.

Claims

The protected location of 1 one kinds of protectors, it comprises that a top is formed with the housing of alarm indicator, inside is provided with a circuit board; Its circuit is combined with thermistor, the lightning-arrest pipe of discharge and described alarm indicator, it is characterized in that:

Be posted by connecting with a conductive clip above corresponding to described thermistor at described circuit board, conductive clip communicates with home loop; The bottom surface of thermistor is lined with one and runs into the fusible block tin of high temperature, and be connected with a signal Copper Foil, to utilize conductive clip, thermistor, tin sheet to constitute signal circuit, form an alarm Copper Foil that is connected with alarm indicator and a ground connection Copper Foil in circuit board upper and lower position corresponding to the block tin place;

When thermistor ran into high temperature, described block tin melted and makes the thermistor bottom surface contact described alarm Copper Foil, signal Copper Foil and ground connection Copper Foil, and alarm indicator is lighted.
The protected location of 2 protectors according to claim 1 is characterized in that:

Described conductive clip is connected with a signal Copper Foil of circuit board.
The protected location of 3 protectors according to claim 1 and 2 is characterized in that:

Described conductive clip cross section is L-shaped.
The protected location of 4 protectors according to claim 1 is characterized in that:

The cross section of described block tin is the T font.
5 protected locations according to claim 1 or 4 described protectors is characterized in that: the trepanning of locating with being formed with on the signal Copper Foil that described block tin contacts that a narrow end for described block tin is inserted in.