JPS62294809A - Poisonous gas detector employed for combustion equipment - Google Patents

Abstract

PURPOSE:To permit a combustion equipment to be used without any anxiety, by a method wherein, an electric source for the combustion equipment is intercepted when a poisonous gas sensor has detected that the amount of the poisonous gas has exceeded a predetermined level. CONSTITUTION:The title detector is constituted of a plug socket 19, which receives the plug 13 of a combustion equipment 1 capable of being connected to a commercial electric source, the plug 17, capable of being connected to the commercial electric source, a CO sensor 20, which detects the amount of CO in a room, a relay 35, provided with a switch 37, excited when the sensor has detected that the amount of CO in the room has exceeded a predetermined amount to memorize and hold the condition thereof while intercepting an power source for the combustion equipment, and a reset switch 38, which releases the memorizing and holding condition of the relay 35. As a result, the combustion equipment can be used without any anxiety. The combustion equipment, already sold and used, can be used by only connecting it to the poisonous gas detector, therefore, the utility thereof is high. Further, the electric source can be supplied to the combustion equipment by operating the reset switch 38, therefore, the combustion equipment may be used immediately after ventilating air.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a toxic gas detector used in combustion equipment equipped with a plug connectable to a commercial power source.

(Previous technology The CO sensor as a toxic gas sensor was developed in the 1980s.
No. 114954 is known, but generally, when the sensor detects a predetermined amount of carbon monoxide, it simply displays a lamp or issues an alarm using a buzzer or the like.

? 1 Problems to be Solved by the Invention In view of the above points, the present invention is designed to cut off the power to the combustion equipment when the toxic gas sensor detects that the amount of toxic gas exceeds a predetermined value. The purpose is not to modify (make it usable) combustion equipment that has already been sold and is in use.

2) Means for solving the problem Therefore, the present invention has an outlet α9 that can be connected to a commercial power source and receives a plug U of a combustion appliance, a plug αη that can be connected to a commercial power source, and a carbon monoxide outlet in the room. A CO sensor (■) detects the amount of carbon monoxide in the room, and when the sensor (■) detects that the amount of carbon monoxide in the room exceeds a predetermined amount, it is energized to memorize the state and cut off the power to the combustion equipment. Switch C3? ) and a reset switch (
(to).

(e) As active combustion takes place, the concentration of carbon monoxide in the room increases,
When the CO sensor ■ detects that the amount of carbon monoxide exceeds 1100PP, the relay (c) is energized, its switch C37) is changed to a b contact, and the power to the combustor is cut off.

After ventilating the room, if the reset switch is fully opened, the relay field will be demagnetized, so the switch 37) will be switched to the C contact, and the reset switch (to) will be closed.
Power can now be supplied to the combustor.

d English example An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) is the indoor open combustion type combustor main body, and its front (
IA) Multiple louver blades +21<21... at the bottom
There is a hot air outlet (3) having a hot air outlet (3) and a hot air blower (4) at the upper part of the back surface (IB). (5) is the main body (
The stand (6) serving as the bottom plate of 1) is a burner that vaporizes and burns petroleum, which is provided via the support stand (7) on the stand (5). The burner (6) is configured to be supplied with combustion air and fuel via an air supply pipe and a fuel nozzle (not shown).

(8) is an air passage housing disposed inside the main body (1), and the front end communicates with the hot air outlet (3) and the rear end communicates with the air blower (4), and the air from the air blower (4) flows through the air passage case. It leads to the discharge port (3).

(9) is a cylindrical combustion tube installed upright in the air passage case (8), and an exhaust gas outlet αQ is provided on the upper surface. αυ
is an air guide plate that forms a cold air blower at the upper part of the air passage housing (8), and is made of a metal plate and guides the exhaust gas from the outlet 0I to the outlet (3). .

αJ is a plug connected to the open power outlet Q41 to supply power to the combustor via the power cord Q9.

αQ is a plug αη that can be connected to the open power outlet α4
This is a toxic gas detector with a box-like external shape and a code Qll. The detector αG has an outlet αl that receives the plug σ3 of the combustor, and commercial power can be supplied to the combustor via the detector (2). ■ is a CO sensor that is a toxic gas sensor that detects the amount of carbon monoxide in the room, and its resistance value decreases as the concentration increases. Qυ is a detection circuit that detects the amount of carbon monoxide, e.g.
When PPm is detected, the output of the microcomputer (hereinafter referred to as microcomputer) as a control circuit (PI)
It is configured to output a lower level output.

[Yes] is a comparator, whose inverting input terminal is connected to the sensor ■
The non-inverting input terminal is connected to the connection point between resistor □□□ and resistor -, and the microcontroller @
is connected to the input port (P).

Also, the output terminal of the comparator is connected to VDn through a resistor (5).
Connected to power. (to) is a rectifier circuit, and one output line of the rectifier circuit ■ is connected to the collector of the transistor A@, and the resistor ■ is connected to the Zener diode A(]υ.The cough Zener diode AC3υ is also It is wrtc to the base of transistor A (21) and connected to the other output line via Zener diode BC33.The connection point of both Zener diodes ABcnc3+,b is connected to the collector of transistor B The emitter of the transistor AH is connected to ground through the other output line, and the pace is connected to the output port (Pl) of the microcontroller @ through a resistor.The emitter of the transistor AH is connected to the coil (Pl) of the relay (c).
3) connected to earth through the relay switch 6
The a contact of the sword is connected to one AC power line lIC1c contact is connected to the outlet (19).The relay field is excited at about 11 volts or more, and once it is energized, it will not turn on unless the voltage drops to 1 volt or less. Use the reset switch to press the push button (38) on the front of the toxic gas detector aQ.
It opens and closes every time A) is pressed, and when the switch (2) opens, the relay field is demagnetized.

The operation of the above configuration will be explained below.

First, connect the plug Q3 of the combustor to the toxic gas detector σe outlet C1l, and connect it to the plug C4l of the detector a0 (lη is the commercial power outlet), then the detector aε
operation begins. In other words, when the plug is connected to the commercial power outlet α1 of the sword, the combustor operation switch (
(not shown) is not closed, combustion is not taking place and the resistance value of the CO sensor (2α is large because the detection value of the carbon monoxide concentration is low. Therefore, the resistance (c) and Since the divided potential of sensor ① and resistor 04) is higher than any divided potential of sensor ① and resistor 04), comparison WG>3) outputs a high level and is input to the input port (P) of microcomputer @.Therefore, output cap-) (PI) outputs a high level output, transistor B (to) conducts, and relay [with] coil (to)
The voltage between the terminals of transistor AC1!9) is expressed as the voltage between the emitter and base of transistor AC1!9), the voltage between the terminals of Zener diode A (3υ), and the voltage between the collector and emitter of transistor B (33), and is approximately 6 volts. Since the relay ω is not excited, its switch r3 is at the C contact, and power can be supplied to the combustor.

In this way, when the user closes the operation switch (not shown), various combustion-related controls are performed on the combustor. That is 1! Fuel is supplied from the output pump and combustion air is supplied from the burner motor to the burner (6), the spark plug starts the ignition operation, and the burner (6) starts combustion. Then, approximately at the same time or slightly after the start of this combustion, a blower for blowing out warm air (
4), hot air containing combustion exhaust gas is supplied into the room through the discharge port (3) to heat the room.

After the combustion starts, combustion by the burner (6) is stopped or started by an indoor component detector (not shown) to keep the indoor temperature constant.

Then, as combustion occurs and the carbon monoxide concentration in the room rises, the resistance value of the CO sensor (■) gradually decreases, and the amount of carbon oxide decreases to 100 PPm.
When the voltage is exceeded, the divided potential between the sensor capacitor and the resistor (2) exceeds the divided potential between the resistor (5) and the resistor (5), and a low level output is output from the detection circuit Cυ.

Therefore, the microcomputer outputs a low level output from the output capacitor (PI), and the transistor BC33 becomes non-conductive. Therefore, the voltage across the coil of relay ω is the sum of the emitter-base voltage of transistor A (2!J), the voltage across Zener diode AC311, and the voltage across Zener diode B (33). It is expressed as approximately 12 volts, so the relay □□□
is energized, and its switch R::3η is the B contact.Therefore, the user is safe because the combustion will stop before it continues and leads to monoxide poisoning, and if you want to use it further, be sure to ventilate it thoroughly. Bye. Then, when ventilation is performed, the resistance value of the CO sensor (20) gradually increases, so the output of the detection circuit (21J) becomes high level. Therefore, the microcomputer @ makes transistor B conductive, so that the coil of the relay field The voltage across the combustor is about 6 volts, but the relay remains energized. Therefore, the power to the combustor remains cut off.
When the push button (38A) on the front of the toxic gas detector CL6) is pressed, the reset switch (■) is opened, the relay so is demagnetized, the switch C37) is changed to the C contact, and the push button (38A) is pressed again.
) and close the reset switch (to), power can be supplied to the combustor, allowing operation.

(G) Effects of the Invention As described above, the present invention provides combustion 9i5 when the toxic gas sensor detects that the amount of toxic gas exceeds a predetermined value
It can be used on land with peace of mind since there is no need to block the water from entering the area. It is also highly practical because it can be used by simply connecting it to a toxic gas detector without modifying combustion equipment that has already been published and is in use. Furthermore, by operating the beam set switch, power can be supplied to the combustion equipment, and the combustor can be used immediately after ventilation.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the detector of the present invention and a combustion chamber, Figure 2 is a control circuit diagram of the toxic gas detector, and Figure 3 is a vertical view of the combustor.
An n-side view is shown. ' (1) 1...Plug, ■...Commercial 1! Power outlet, qF5... Toxic gas detector, α...
Plug, C19! ...Outlet, ■...CO
Sensor, C])...Detection circuit, a...Microcomputer, (351/IJ Ray, G71...
・Switch, (to)...Reset switch.

Claims (1)

[Claims] (1) An outlet that accepts the plug of a combustion device that can be connected to a commercial power source, a plug that can be connected to a cylinder power source, a toxic gas sensor that detects the amount of toxic gas in the room, and a Used in combustion equipment, comprising a circuit that memorizes the state and cuts off power to the combustion equipment when the sensor detects that a fixed amount has been exceeded, and a reset switch that releases the memorized state of the circuit. Toxic gas detector.