JPH0245638Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a heating device equipped with an open combustion device.

BACKGROUND ART In so-called gas fan heaters, gas water heaters, and the like that are used indoors in houses, indoor air is used for combustion, and exhaust gas is discharged indoors.
If you use such an open combustion device for a long time,
The room becomes contaminated with pollutants such as carbon monoxide. Therefore, when such an open combustion device is used, it is necessary to perform ventilation for about 1 minute each time, for example, once every 30 minutes, which is troublesome.

To solve this problem, we installed a ventilation fan in the room, a detection element that detects indoor pollutants, and in response to the output from this detection element, the ventilation fan is activated when the concentration of the pollutant becomes relatively high. control means for In such prior art,
There is a problem in that a ventilation fan must be installed in the room.

Problems to be Solved by the Invention The object of the present invention is to provide a heating device equipped with an open combustion device that improves safety against pollutants in a space where exhaust gas from the open combustion device is discharged. do.

Means for Solving the Problems The present invention uses combustion air from the combustion air intake 4 to combust the fuel supplied to the burner 5, and uses a fan 6 with a variable rotation speed to combust the fuel. An open combustion device 2 that discharges exhaust gas from an outlet 7 into the room 1 to be heated; a detection element 8 that is installed near the combustion air intake 4 and detects the concentration of carbon monoxide; (a) a solenoid valve 11 for adjusting the flow rate of the fuel supplied to the device and for cutting off the supply of the fuel; means 12 and 13 for generating an alarm; and responding to the output of the detection element 8; When the difference between the current concentration A and the initial state concentration A1 is less than a predetermined first value ΔA1, the solenoid valve 11 is fully opened;
and the fan 6 is rotated at high speed, (b) the difference is the first
is greater than or equal to the value ΔA1 and less than a predetermined second value ΔA2, the alarm means 12 and 13 are operated, the opening degree of the solenoid valve 11 is narrowed down, and the rotational speed of the fan 6 is reduced, (c) A heating device equipped with an open combustion device, characterized in that it includes a processing circuit 9 that shuts off the solenoid valve 11 and stops the fan 6 when the difference is greater than or equal to a predetermined second value ΔA2. It is.

Embodiment FIG. 1 is a simplified cross-sectional view of one embodiment of the present invention. A so-called gas fan heater 2 is installed in an indoor room 1. This gas fan heater 2 burns gas fuel supplied to a burner 5 using combustion air from a combustion air intake 4 provided at the back of a housing 3, and the exhaust gas is discharged by a fan 6. , are discharged into the chamber 1 from the outlet 7 of the housing 3. Heating is performed in this way.

FIG. 2 is a block diagram showing the electrical configuration of one embodiment of the present invention. In the housing 3 of the gas fan heater 2, a detection element 8 is provided near the combustion air intake 4 for detecting the concentration of carbon monoxide, which is an indoor pollutant. The output from the detection element 8 is input to a processing circuit 9 realized by a microcomputer or the like. A solenoid valve 11 interposed in a line 10 supplying gaseous fuel to the burner 5 is controlled by a processing circuit 9 . The opening degree of this electromagnetic valve 11 is controlled by the processing circuit 9, so that the flow rate of gas fuel supplied to the burner 5 is adjusted. The rotational speed of the fan 6 is controlled by the processing circuit 9, so that the flow rate of combustion air is adjusted.
The housing 3 is equipped with an indicator lamp 12 and a buzzer 13. The timer 14 is provided to set a time period during which the gas fan heater 2 can continue operating.

Referring to FIG. 3, the process moves from step n1 to step n2, and the timer 14 sets a time period during which the gas fan heater 2 should continue to operate. In step n3, the difference between the current concentration A of carbon monoxide etc. detected by the detection element 8 and the concentration A1 of carbon monoxide etc. in the initial state is set to a predetermined value ΔA1 in the processing circuit 9. It is determined whether the When the air in the room 1 is not contaminated with carbon monoxide, the solenoid valve 11 continues to operate fully open, the fan 6 rotates at a relatively high speed, and the heating in the room 1 continues. .

As the gas fan heater 2 continues to operate, the air in the room 1 becomes contaminated, and the difference between the current concentration A of carbon monoxide detected by the detection element 8 and the initial value A1 increases. When the value exceeds the predetermined value ΔA1, the process moves from step n3 to step n4, and the processing circuit 9 lights up the lamp 12 and turns on the buzzer 1.
3 is sounded to warn that the air in the room 1 is contaminated and ventilation is required.
Further, in step n5, the processing circuit 9 reduces the opening degree of the solenoid valve 11 to reduce the consumption flow rate of gas fuel and also lowers the rotational speed of the fan 6.
In this way, the increase in the concentration of carbon monoxide in the air inside the room 1 is suppressed by the so-called natural ventilation leaking from the gaps in the room 1. step n6
If it is determined in step n7 that the time set by the timer 14 has not elapsed, the process moves to step n7. In step n7, it is determined whether the difference between the current concentration A of carbon monoxide detected by the detection element 8 and the initial value A1 is less than a predetermined second value ΔA2, and if so, the step Return to n3 (ΔA1<ΔA2).

The concentration A of carbon monoxide in room 1 is the first value A1
As mentioned above, the operation continues with the consumption flow rate of gas fuel reduced as described above, and as a result, the concentration of carbon monoxide further increases, and the difference between A and A1 is reduced. When the predetermined second value ΔA2 is exceeded, the process moves from step n7 to step n8, where the electromagnetic valve 11 is shut off and the fan 6 is stopped, and the operation is thus stopped at step n9.

While the gas fan heater 2 continues to operate, when the time set by the timer 14 has elapsed, the process moves from step n6 to step n8, and the operation is stopped.

According to such an embodiment, even if the gas fan heater 2 is used, for example, while sleeping, the concentration of carbon monoxide in the room 1 will not become excessively high.
It is safe and eliminates the need for ventilation while sleeping. Furthermore, the operation of the timer 14 makes it possible to continue operation for a predetermined period of time while the user is sleeping, which is convenient. Furthermore, even if the user of the gas fan heater 2 is an infant, safety is maintained.

The present invention uses not only the gas fan heater 2 described above, but also a gas instantaneous water heater and other open-type combustion systems in which the air in a space such as a room is used for combustion, and exhaust gas is discharged into that space. Extensively implemented in connection with equipment. Open combustion devices may use not only gaseous fuels but also liquid fuels and other fuels.

Effects As described above, according to the present invention, when the concentration of pollutants increases, an alarm is generated by an alarm display means such as a lamp or a buzzer, making it easy to notify the need for ventilation. This will help prevent air pollution and improve safety.
In other words, the detection element 8 detects the concentration of carbon monoxide.
When the difference between the current concentration A detected by and the initial state concentration A1 is less than a predetermined first value ΔA1, the solenoid valve that supplies fuel to the open combustion device 2 is fully opened, and When the fan 6 is rotated at a high speed to rapidly perform heating and maintain the heating state, and the difference is greater than or equal to the first value ΔA1 and less than the predetermined second value ΔA2, the above-mentioned operation is performed. while operating the alarm means 12 and 13,
By narrowing the opening of the solenoid valve 11 and lowering the rotational speed of the fan 6, the rise in the concentration of carbon monoxide is suppressed by natural ventilation leaking from the room 1 to be heated. heating,
Moreover, safety is ensured.

Further heating is performed, and the difference becomes the second temperature determined in advance.
When the value ΔA2 or more is reached, the solenoid valve 11 is shut off, the fuel supply is cut off, and the fan 6 is stopped. This causes carbon monoxide levels to rise too much,
Dangerous situations are prevented and safety is further ensured.

[Brief explanation of the drawing]

FIG. 1 is a simplified sectional view of an embodiment of the present invention, FIG. 2 is a block diagram showing the electrical configuration of an embodiment of the present invention, and FIG. 3 is a diagram showing the electrical structure of an embodiment of the present invention. 2 is a flowchart for explaining the operation of the embodiment. 1...Room, 2...Gas fan heater, 3...
Housing, 4... Combustion air inlet, 5... Burner, 6... Fan, 7... Outlet, 8... Detection element, 9... Processing circuit, 11... Solenoid valve, 12...
Lamp, 13...buzzer, 14...timer.

Claims (1)

[Claim for Utility Model Registration] Combustion air from the combustion air intake 4 is used to combust the fuel supplied to the burner 5, and the exhaust gas is transferred to the outlet 7 by a fan 6 whose rotation speed is variable. an open combustion device 2 that discharges carbon monoxide from the air into the room 1 to be heated; a detection element 8 installed near the combustion air intake 4 to detect the concentration of carbon monoxide; a solenoid valve 11 for adjusting the flow rate of the fuel and cutting off the supply of the fuel; means 12 and 13 for generating an alarm; When the difference between the concentration A1 and the initial state concentration A1 is less than a predetermined first value ΔA1, the solenoid valve 11 is fully opened;
and the fan 6 is rotated at high speed, (b) the difference is the first
is greater than or equal to the value ΔA1 and less than a predetermined second value ΔA2, the alarm means 12 and 13 are operated, the opening degree of the solenoid valve 11 is narrowed down, and the rotational speed of the fan 6 is reduced, (c) A heating device equipped with an open combustion device, characterized in that it includes a processing circuit 9 that shuts off the solenoid valve 11 and stops the fan 6 when the difference is greater than or equal to a predetermined second value ΔA2. .