JPH0619232B2 - Exhaust gas detector mounting structure for heaters - Google Patents

Exhaust gas detector mounting structure for heaters

Info

Publication number
JPH0619232B2
JPH0619232B2 JP61020571A JP2057186A JPH0619232B2 JP H0619232 B2 JPH0619232 B2 JP H0619232B2 JP 61020571 A JP61020571 A JP 61020571A JP 2057186 A JP2057186 A JP 2057186A JP H0619232 B2 JPH0619232 B2 JP H0619232B2
Authority
JP
Japan
Prior art keywords
exhaust gas
combustion
burner
heat exchanger
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP61020571A
Other languages
Japanese (ja)
Other versions
JPS62178818A (en
Inventor
喜正 坪井
義男 水戸
Original Assignee
株式会社トヨトミ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社トヨトミ filed Critical 株式会社トヨトミ
Priority to JP61020571A priority Critical patent/JPH0619232B2/en
Publication of JPS62178818A publication Critical patent/JPS62178818A/en
Publication of JPH0619232B2 publication Critical patent/JPH0619232B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/003Systems for controlling combustion using detectors sensitive to combustion gas properties
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00Fail safe
    • F23N2231/20Warning devices

Description

The present invention relates to an exhaust gas detector mounting structure for detecting combustion abnormality.

[Conventional technology]

Japanese Patent Publication No. 48-22525, which is the invention of the applicant, has a configuration in which a gas detector is attached to a heater to detect an abnormality of a burner used in the heater. Generally, a gas detector has a narrow usable temperature range and cannot use a high-temperature combustion gas directly as a detection gas.
In No. 225, a gas detector is attached near the lower air supply hole of the frame of the heater. With this mounting structure, the abnormal combustion of the burner is detected only when the air in the room where the heater is used is considerably polluted, and the abnormal combustion of the burner cannot be directly detected. Therefore, at present, the mainstream method is to know the abnormal combustion of the burner relatively quickly by using the flame current and the temperature of a specific portion including the flame.

[Problems to be Solved by the Invention]

By the way, although the device that detects abnormal combustion based on flame current and temperature can relatively well cope with abnormal combustion that occurs under specific conditions, when conditions such as air pollution and oxygen shortage are compounded, abnormal combustion begins to occur. In many cases, the current and temperature were different from other cases, and it was not possible to deal with all abnormal combustion. The present invention makes it possible to directly detect the start of abnormal combustion by devising the mounting structure of the exhaust gas detector.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention directly detects combustion gas to detect an abnormality. The exhaust gas collector 2 installed above the burner 1 and the collected combustion exhaust gas and indoor heat Exchanger 3 and exhaust gas discharge port 4 for collected combustion exhaust gas
And a temperature sensor 7 and an exhaust gas abnormality detector 6 are installed in the exhaust gas flow path 5 extending from the heat exchanger 3 to the exhaust gas discharge port 4, and the burner 1 and the heat exchange portion are indoors. A convection fan 8 for sending air is provided, and the convection fan 8 is of a variable rotation speed type to guide the air flow to the heat exchanger 3 and the exhaust gas temperature at the outlet of the heat exchanger 3 is changed by the convection fan having a variable rotation speed. Is kept constant by the signal of the temperature sensor 7, and is an exhaust gas detector mounting structure for a heater.

[Work]

As for the exhaust gas abnormality detector 6, the abnormality detector used under normal temperature conditions is less expensive than the one that can be used under high temperature conditions. However, the detection delay cannot be avoided by the method of directly detecting the room air at room temperature. In the present invention, the combustion exhaust gas is directly detected to detect an abnormality, and in the exhaust gas flow path 5 from the exhaust gas collector 2 to the exhaust gas discharge port 4,
The heat exchanger 3, the temperature sensor 7, and the exhaust gas abnormality detector 6 are attached, and the indoor air is blown to the heat exchanger 3 by the convection fan 8 for indoor air. This is to monitor the amount of HC gas, CO gas, oxygen, etc. in the combustion exhaust gas.

A variable rotation speed type is used for the convection fan 8, and the rotation speed is changed by the signal of the temperature sensor 7 so that the temperature sensor 7 reaches a predetermined temperature, and the detection accuracy of the exhaust gas abnormality detector 6 is improved. Further, when the combustion gas has a high temperature, the air flow rate becomes large, and when the temperature is low, the air flow rate becomes small, which is a preferable air blower as a heater.

[Explanation of Examples]

This structure will be described with reference to the drawings showing an embodiment. 1 is a heater burner, 2 is an exhaust gas collector mounted above the burner 1, and 4 is a gas discharge of combustion exhaust gas collected by the exhaust gas collector 2. The heat exchanger 3 for the indoor air is arranged in the exhaust gas flow path 5 between the exhaust gas collector 2 and the exhaust gas discharge port 4, which is the outlet. 6 is an exhaust gas abnormality detector, 7 is a temperature sensor,
It is attached to the exhaust gas passage 5 extending from the heat exchanger 3 to the exhaust gas discharge port 4.

Reference numeral 8 denotes a convection fan that sends indoor air to the combustion section and the heat exchange section of the burner 1, and the convection fan 8 also blows indoor air to the heat exchanger 3 of the exhaust gas passage 5. The convection fan 8 is composed of a variable number of revolutions so that the amount of blown air can be varied, and convection is performed so that the temperature detected by the temperature sensor 7 composed of a thermistor becomes the optimum temperature for the exhaust gas abnormality detector 6. The amount of air blown by the fan 8 is changed.

Reference numeral 14 is a radiating fin attached to the heat exchanger 3, 15 is a heat shield plate provided between the burner 1 of the burner 1 and the exchanger 3,
The indoor air sent by the convection fan 8 is diverted by the heat shield plate 15 and one of them is sent to the combustion section or the heat exchange section of the burner 1 to heat the indoor air to generate warm air and blow it out. The other part of the split flow is sprayed onto the heat exchanger 3, and the heat of the burner 1 is not received by the heat shield plate 15 and is effectively cooled by the radiation fins 14.

When the burner 1 is burned, the exhaust gas collector 2 is attached above the burner 1, so that part of the combustion exhaust gas is recovered by the exhaust gas repair device 2.
Flows into the heat exchanger 3 and the combustion exhaust gas exchanges heat with the indoor air in the heat exchanger 3 to lower the temperature. At this time, the temperature sensor 7 of the exhaust gas passage 5 indicates that the temperature of the combustion exhaust gas is
The convection fan 8 is set so that the exhaust gas abnormality detector 6 has an optimum temperature.
It controls the amount of air flow.

That is, FIG. 2 shows an electric circuit of the exhaust gas abnormality detector 6, which detects an abnormality mainly by monitoring unburned gas. Reference numeral 9 is an exhaust gas abnormality detection element by a catalytic combustion method. Inside, two element bodies are connected in series, and by opening one in a sealed chamber and the other, unburned gas comes into contact with the opened element body. At the time of combustion, the temperature rise (abnormal state) of the element body is detected as the voltage fluctuation of the connection part.

That is, the exhaust gas resulting from complete combustion does not contain unburned gas such as CO gas, and the burner in which the air supply amount and the fuel are the same does not contain oxygen in the exhaust gas. When abnormal combustion occurs, CO gas, which is an unburned component, increases in the exhaust gas, and if abnormal combustion occurs due to insufficient air, a flame rises and the exhaust gas collector 2 is located in the flame to detect oxygen and detect an abnormality. can do.

Reference numerals 10 and 10 'are fixed resistors connected in series to obtain a reference voltage for knowing the voltage fluctuation of the element body. Reference numeral 11 is a differential amplifier that compares the reference voltage with the voltage fluctuation of the element body, and the output drives the relay 13 via the transistor 12. Therefore, the contact of the relay 13 sounds an alarm,
It works on the burner controller to stop the combustion.

The temperature sensor 7 corrects the reference voltage obtained by the resistors 10 and 10 '.
Has a function of detecting the temperature of the combustion gas in the exhaust gas flow path 5, and the voltage at the connection point between the fixed resistance 10.10 'and the temperature sensor 7 rises and falls depending on the change in the combustion gas temperature.
By setting the optimum voltage for the exhaust gas abnormality detector 6, when the voltage fluctuates up and down, the rotation speed of the convection fan 8 can be changed so as to cancel this fluctuation, and the exhaust gas temperature can be kept constant.

〔The invention's effect〕

As described above, in the present invention, even if the combustion exhaust gas is directly guided to the exhaust gas abnormality detector, the exhaust gas abnormality detector operates reliably, and the abnormal combustion is directly detected from the exhaust gas of the burning burner. Therefore, compared with the indirect type abnormality detection, the accuracy is significantly improved and the safety of the burner is increased.

In addition, the amount of combustion exhaust gas to be collected is very small, and the exhaust gas collector, heat exchanger, etc. may be small, and the cost increase is also very small.

The convection fan changes the number of revolutions according to the temperature of the combustion exhaust gas.When the combustion is accelerated and the calorific value is large even during normal combustion, the air flow is large, and conversely the calorific value is small. When the temperature becomes low, the temperature of the combustion exhaust gas becomes low and the amount of air blown becomes small, so that the rotation speed of the convection fan changes depending on the combustion amount, which is preferable for controlling the convection fan of the heater.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a circuit diagram of an embodiment of an exhaust gas abnormality detector. 1 ... Burner, 2 ... Exhaust gas collector, 3 ... Heat exchanger,
4 ... Exhaust gas discharge port, 5 ... Exhaust gas flow path, 6 ... Exhaust gas abnormality detector, 7 ... Temperature sensor, 8 ... Convection fan

Claims (1)

[Claims]
1. An exhaust gas collector 2 mounted above a burner 1.
And a heat exchanger 3 for collecting the collected combustion exhaust gas and room air,
An exhaust gas flow path 5 extending from the heat exchanger 3 to the exhaust gas discharge port 4 is arranged continuously with the exhaust gas discharge port 4 of the collected combustion exhaust gas.
A temperature sensor 7 and an exhaust gas abnormality detector 6 are attached to the burner 1, and a convection fan 8 that sends indoor air to the combustion section and the heat exchange section of the burner 1 is provided. The exhaust gas detector of a heating device is characterized in that the exhaust gas temperature at the outlet of the heat exchanger 3 is kept constant by the signal of the temperature sensor 7 by means of a convection fan that guides the flow to the heat exchanger 3 and the rotation speed is variable. Construction.
JP61020571A 1986-01-31 1986-01-31 Exhaust gas detector mounting structure for heaters Expired - Lifetime JPH0619232B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61020571A JPH0619232B2 (en) 1986-01-31 1986-01-31 Exhaust gas detector mounting structure for heaters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61020571A JPH0619232B2 (en) 1986-01-31 1986-01-31 Exhaust gas detector mounting structure for heaters

Publications (2)

Publication Number Publication Date
JPS62178818A JPS62178818A (en) 1987-08-05
JPH0619232B2 true JPH0619232B2 (en) 1994-03-16

Family

ID=12030877

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61020571A Expired - Lifetime JPH0619232B2 (en) 1986-01-31 1986-01-31 Exhaust gas detector mounting structure for heaters

Country Status (1)

Country Link
JP (1) JPH0619232B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990014561A1 (en) * 1989-05-13 1990-11-29 Zibrowius Gmbh Process for monitoring and safely operating flueless stoves, especially paraffin stoves and device for implementing the process
US5165883A (en) * 1989-10-26 1992-11-24 Toyotomi Co. Ltd. Apparatus and method for safe operation of kerosene heaters
JP5067037B2 (en) * 2007-06-21 2012-11-07 三浦工業株式会社 Combustion device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54240A (en) * 1977-06-02 1979-01-05 Yazaki Corp Gas detecting apparatus
JPS5710023A (en) * 1980-06-23 1982-01-19 Toshiba Corp Safety device for combustion

Also Published As

Publication number Publication date
JPS62178818A (en) 1987-08-05

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