JPH02618Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The present invention relates to a hot air heater among combustion equipment, and is equipped with a color sensor that detects a decrease in oxygen concentration and the occurrence of incomplete combustion related to this. This relates to a heating machine.

[Prior art]

The light from the combustion flame is received by the color sensor described later,
A device has been proposed that detects the oxygen concentration in the air and detects the start of incomplete combustion (see Japanese Patent Application No. 73868/1983). However, since the operating temperature of this color sensor is 0° C. to +70° C., if it is provided opposite to the combustion flame, the color sensor may become hot and its operation may become unreliable.

To solve the above problem, by installing the color sensor between the combustion furnace and the fan, the color sensor and the fan can directly cool the color sensor, allowing the color sensor to operate within the operating temperature range of 0 to +70℃.
A combustion-type warm air heater has been proposed that maintains However, in this type of device, the temperature is guaranteed by air cooling and the temperature is not directly detected, so there is a problem that the color sensor is damaged in a situation where the guaranteed temperature is exceeded.

〔the purpose〕

The present invention was devised in view of the above problems, and aims to maintain the reliability of the color sensor during long-term use by measuring the temperature of the color sensor itself or its surroundings using a temperature sensor such as a thermistor.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a vaporizing oil hot air combustor, and 1 is a combustion equipment main body equipped with an oil tank (not shown). 2 is a vaporizer connected to the oil tank,
Converts liquid kerosene to vaporized gas. Reference numeral 3 denotes a Bunsen burner for burning this vaporized gas, where the vaporized gas is burned as a blue flame consisting of a reducing flame 4 and an oxidizing flame 5. A furnace 6 is provided to surround the burner 3 and has an exhaust port 7 above. The hot air 8 from the exhaust port 7 is blown to the front of the main body 1 as warm air by a fan 9 provided at the rear inside the main body 1. 1
Reference numeral 0 denotes a see-through window drilled at a position corresponding to the oxidizing flame 5 of the furnace 6, and a square-shaped element mounting angle 12 is fastened to the outer periphery of the window with a screw 13 via a heat insulating material 11. There is. 14 is a protective tube inserted into the angle 12 and fixed thereto, and a color sensor 15 is attached to one end of the protective tube.
(This protective tube 14 and angle 1
2 and 2 are collectively referred to as protective equipment). The structure and equivalent circuit of this color sensor are shown in FIGS. 2a and 2b. P layer 19
Photodiode PD by PN junction with N layer 20
1 has high short wavelength sensitivity, and P layer 21 and N layer 20
The photodiode PD2 formed by a PN junction with the photodiode PD2 has high long wavelength sensitivity. Note that 22 is an insulating film, and 23 is a P
An electrode provided on the layer 19, 24 an electrode provided on the N layer 20, and 25 an electrode provided on the P layer 21.

The protection tube 14 protects the color sensor 15 and also serves to block light from the outside in order to improve performance. By providing the color sensor 15 between the combustion furnace 6 and the fan 9, the color sensor 15 is directly air-cooled by the fan 9.

Reference numeral 17 denotes a temperature sensor such as a thermistor, which is thermally attached to the mounting angle 12. This temperature sensor 17 also serves as a temperature sensor that has conventionally been provided around the outer periphery of the furnace 6 to detect overheating. In other words, conventional temperature sensors for detecting overheating react at around 120°C as the overheating detection temperature to prevent overheating accidents in combustion engines, but in this invention,
By attaching the temperature sensor 17 to the mounting angle 12, 70°C at this position corresponds to the overheat detection temperature of 120°C at the conventional position,
At the same time as overheating is detected, it is also detected that 70° C., which is the upper limit of the operating temperature range of the color sensor 15, has been exceeded. This is because the mounting angle 12 is cooled by the air blown by the fan 9, so if the temperature exceeds 70°C at this position, the furnace 6 is in an overheated state. Therefore, the temperature sensor 17 may be installed at a position where the furnace is in an overheated state when the color sensor 15 reaches the upper limit operating temperature of 70°C. In short, one temperature sensor 17 detects overheating and detects a temperature rise above the operating temperature of the color sensor 14.
The point of interest is that this is done by

The temperature of the color sensor 15 is measured by the thermistor 17, and if it is detected that the temperature of the color sensor 15 is above the operating temperature range, combustion is stopped. As a result, it is ensured that the color sensor 15 is maintained within the operating temperature range, and stable detection can be performed for a long period of time. Note that 16 is a lead wire of a color sensor, and 18 is a lead wire of a thermistor.

〔effect〕

As mentioned above, according to the present invention, during combustion, the color sensor is sufficiently cooled by the convection fan, and the temperature sensor ensures that the color sensor is within the operating temperature range, so it can be used for a long period of time. , it is possible to stably detect an oxygen-deficient state and an incomplete combustion state. Therefore, if you use this detection output to perform ventilation, etc., you can not only eliminate accidents caused by oxygen deficiency and incomplete combustion, but also headaches caused by oxygen deficiency and incomplete combustion, which is extremely useful. It is.
Another advantage is that the temperature sensor that detects a temperature higher than the operating temperature of the color sensor can also be used to detect the temperature of the combustion section in an overheated state.

[Brief explanation of the drawing]

Figure 1: Side view of the combustor of the present invention, Figure 2a,
b: Structural diagram and equivalent circuit diagram of the color sensor. 9... Convection fan, 12... Element mounting angle, 15... Color sensor, 17... Temperature sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] In a heating machine that is provided with a convection fan corresponding to the combustion section and discharges hot air through the convection fan, a color sensor that receives light from the combustion flame is attached and used for protection. This protector is attached to the outer surface of the combustion part located in the ventilation path of the convection fan, and a temperature sensor such as a thermistor that also serves as an overheat detection is installed in or around the protector to detect this temperature. A combustion type hot air heater characterized in that combustion is stopped when a sensor detects a temperature equal to or higher than the operating temperature of the color sensor.