CN2172472Y

CN2172472Y - Portable combustible gas alarm

Info

Publication number: CN2172472Y
Application number: CN 93240597
Authority: CN
Inventors: 秦鹰
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-28
Filing date: 1993-09-28
Publication date: 1994-07-20
Anticipated expiration: 2003-09-28

Abstract

The utility model discloses a portable combustible gas alarm, which solves the problems that the volume of the gas alarm is big, and the gas alarm can not be carried conveniently. The utility model has the technical proposal that the inner part of a casing is provided with a control circuit board, an explosion-proof metal sheet is arranged between the control circuit board and the casing, one side of the casing is provided with a loud speaker, a light emitting diode, and a sensor, and the other side is provided with hooks. The control circuit board is provided with a power filter, a comparator, a timer, a driver, a delay switch, and a language alarm. The utility model has the advantages of simple structure, high sensitivity and portability. The utility model can be used for the combustible gas leakage alarm for the family and the utility model is particularly suitable for the underground operation staff.

Description

Portable combustible gas alarm

The utility model relates to a kind of portable flammable gas alarm.

Along with people's living standard improves constantly, gas-cooker has been come into huge numbers of families, and these heat power of gas burner are big, and are easy to use, brings great convenience to people's life.But when using gas-cooker,, do not plant poison and gas explosion accident having to occur personnel under the situation of warning reminding because the gas leak phenomenon insufficient and that the burnt gas switch long term wear occurs that burns often has the staff of generation, particularly borehole operation.At present, China and gas alarm is abroad all arranged, but these gas alarms can easily monitor the concentration of flammable explosive gas around the staff, reach safety work, but these alarm volumes are big, complex structure, the cost height, carry inconvenience, and down-hole geographical configuration complexity, but the concentration of the flammable explosive gas in every place is all different, so, for safety work, the staff of down-hole must everyone carry an alarm, but in order to monitor self concentration of flammable explosive gas on every side.

The purpose of this utility model just is to provide a kind of volume little, highly sensitive, simple in structure, and cost is low, a kind of portable flammable gas alarm easy to carry.

For achieving the above object, the utility model is achieved in that and is provided with control circuit board in housing, at control circuit board to being provided with explosion-proof sheet metal between the housing, one side at housing is provided with loudspeaker, light emitting diode and sensor, is provided with hook at the another side of housing.On control circuit board, be connected with power-supply filter in turn, comparer, timer, driver and language alarm device, between the input end of the output terminal of power-supply filter and comparer, be in series with sensor, the output two ends of power-supply filter are provided with heater strip, between comparer and timer, be connected to diode, output terminal at the language integrated package is connected to triode, at the collector of triode to being in series with loudspeaker and light emitting diode between the power-supply filter, the output terminal of delay controller is connected with the negative input of comparer, the negative input and the timer of time-delay comparer, the negative input of driver is connected, and is connected to variable resistor at the negative input of comparer between the ground.

The utility model has the advantages that: volume is little, and is simple in structure, highly sensitive, and cost is low, easy to carry.

The drawing explanation:

Accompanying drawing 1 is the utility model one-piece construction front elevational schematic;

Accompanying drawing 2 is the utility model accompanying drawing 1A-A cut-open views;

Accompanying drawing 3 is the utility model circuit diagrams.

Now the utility model is described in further detail in conjunction with specific embodiments:

The output terminal of three operational amplifier F1, F2 and F3 is connected with the positive level input end of back one-level constitutes comparer ［ 9 ］, timer ［ 10 ］ and driver ［ 11 ］ successively, at the output head anode of power-supply filter ［ 8 ］ to being in series with resistance R 2, variable resistor WR and resistance R 3 between the negative pole successively, be connected to the negative pole of operational amplifier F1 in resistance R 2 and the junction of variable resistor WR, the positive pole of operational amplifier F1 joins by sensor ［ 1 ］ and power-supply filter ［ 8 ］, and direct supply filtering ic chip 1 output terminal is parallel with capacitor C 1 and heater strip L.Comparer ［ 9 ］ is connected by diode D2 with timer ［ 10 ］, in the anodal junction of diode D2 and operational amplifier F2 to being parallel with timing resistor R7 and timing capacitor C3 between the ground.In delay controller ［ 12 ］, resistance R 4 is in series with resistance R 5, resistance R 6 is in series with capacitor C 2, be parallel with diode D1 at resistance R 6 two ends, again they are parallel on the power-supply filter ［ 8 ］, the negative input of operational amplifier F4 is connected with the junction of resistance R 4, R5, and the electrode input end of operational amplifier F4 is connected with the junction of resistance R 6, capacitor C 2.The output terminal of delay controller ［ 12 ］ is connected with the negative input of comparer ［ 9 ］, and the negative input of operational amplifier F4 is connected with the negative input of operational amplifier F2, F3 in the delay controller ［ 12 ］.Driver ［ 11 ］ is connected with the pin 2 of the integrated wide IC2 of language in the language alarm device ［ 13 ］, be connected to the base stage of triode BG on the pin 7 of language integrated package IC2, the collector of triode BG is to being in series with loudspeaker ［ 5 ］ and light emitting diode ［ 4 ］ between the power-supply filter ［ 8 ］.Power-supply filter ［ 8 ］ is connected to stabilivolt D4, resistance R 9 respectively between the pin 4 of language integrated package IC2, pin 3.

Claims

1, a kind of portable flammable gas alarm, it is characterized in that in housing [2], being provided with control circuit board [7], be provided with explosion-proof sheet metal [6] at control circuit board [7] between the housing [2], one side at housing [2] is provided with loudspeaker [5], light emitting diode [4] and sensor [1], is provided with hook [3] at the another side of housing [2].

2, a kind of portable flammable gas alarm as claimed in claim 1, it is characterized in that on control circuit board ［ 7 ］, being connected with in turn power-supply filter ［ 8 ］, comparer ［ 9 ］, timer ［ 10 ］, driver ［ 11 ］ and language alarm device ［ 13 ］, between the input end of the output terminal of power-supply filter ［ 8 ］ and comparer ［ 9 ］, be in series with sensor ［ 1 ］, the output two ends of power-supply filter ［ 8 ］ are provided with heater strip L, between comparer ［ 9 ］ and timer ［ 10 ］, be connected to diode D2, pin 7 output terminals at language integrated package IC2 are connected to triode BG, at the collector of triode BG to being in series with loudspeaker ［ 5 ］ and light emitting diode ［ 4 ］ between the power-supply filter ［ 8 ］, the output terminal of delay controller ［ 12 ］ is connected with the negative input of comparer ［ 9 ］, the negative input and the timer ［ 10 ］ of time-delay comparer ［ 12 ］, the negative input of driver ［ 11 ］ is connected, at the negative input of comparer ［ 9 ］ to being connected to variable resistor WR between the ground.