JPS6237743B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hot air heater.

Conventionally, many hot air heaters that mix combustion exhaust gas and convective air flow and discharge the mixture as warm air are provided with a temperature sensor in the combustion exhaust gas path to detect combustion abnormalities. Since the inner wall in the path is not surface-treated and has a metallic luster, the combustion radiation from the burner is diffusely reflected internally or externally due to the shape of the inner wall.

For this reason, the sensor located in the same path is greatly affected by burner radiation, making it difficult to obtain stable characteristics and causing malfunctions due to variations due to irregularities in combustion.

Therefore, the present invention aims to significantly reduce the reflection of radiation from the combustion part in the combustion exhaust gas path, stabilize the characteristics of the temperature sensor in the path, and reduce changes in characteristics due to aging. It is.

In order to achieve this object, the present invention applies a heat-resistant black coating to the entire area or a part of the inner wall of the combustion exhaust gas path, so that the radiation from the combustion part is absorbed without being reflected by the inner wall of the hot air path. .

One embodiment will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a cylindrical main body, which has an ejector fan 2 at the inner upper part, a disc-shaped ejector baffle plate 3 at the inner center, and a cylindrical ejector tube 4 at the inner lower part. Furthermore, a combustion chamber A is formed inside the ejector tube 4, and the flow of air from the ejector fan 2 to the outlet 6 causes an ejector effect in the lower part of the ejector baffle plate 3, and the pressure in the combustion chamber A becomes negative pressure. Become. 7 is a tank placed on a stand 8, which has a cylindrical core inner cylinder 9 and a cylindrical outer core cylinder 10 approximately in the center, and a fire pan part 9a is formed at the upper end of the core inner cylinder 9. A ventilation cylinder for guiding combustion air is formed from the upper end to the lower end. Note that there is also a fire pan part 10 at the upper end of the core outer cylinder 10.
a is formed.

Reference numeral 11 denotes a cylindrical lamp wick provided vertically movably between the wick guide tube 9 and the wick outer tube 10, which sucks up the petroleum fuel put into the tank 7 and converts it into the vaporizing section 1 at the upper end.
It is vaporized from 1a.

12 has a plurality of small holes, and the lower end is connected to the fire pan part 9a,
This is a combustion tube placed on top of the combustion tube 10a, and the outside is covered by the ejector tube 4.

In the above configuration, the combustion exhaust gas passage becomes a combustion exhaust gas passage where the combustion exhaust gas flows as shown by the broken line arrow.

The outer surface of the ejector tube 4 and the inner wall of the main body 1 opposite thereto are coated with heat-resistant black paint 4a and 1, respectively.
a, and a temperature sensor 5 is provided on the wall surface or between the walls to detect an abnormality in the temperature of the hot air.

And in this configuration, Ejiektafan 2
Due to the flow of air toward the outlet 6, the lower part of the ejector baffle plate 3, that is, the inside of the ejector tube 4, becomes negative pressure, so that the combustion air flows into the inner space of the inner core tube 9, the outer core tube 10, and the ejector tube 4. The combustion tube 12 is inserted through the space between the lower part and the combustion tube 12 as shown by the solid arrow.
There, it is sucked up by the lamp wick 11, mixed with the vaporized petroleum fuel vapor, and combusted.
Further, the combustion exhaust gas mixes with the air flow from above the ejector fan 2 through the upper part of the ejector tube 4 and flows to the outlet 6, becoming hot air for room heating.

If the hot air temperature is abnormally high, the temperature sensor 5
is activated, the lamp wick 11 is lowered by a lowering mechanism (not shown), and combustion is stopped.

Here, the radiation generated from the combustion chamber A reaches the ejector baffle plate 3 through the upper opening of the ejector tube 4, and the combustion flame is reflected here in red, which is reflected between the main body 1 and the ejector tube 4. However, this is between the main body 1 and the ejector tube 4 (combustion exhaust gas path)
Since it is absorbed without being reflected by the inner wall of the sensor, there is almost no radiation to the temperature sensor 5 in this path.
It operates stably according to combustion, and can be used at low operating temperatures. Furthermore, the temperature sensor 5 is hardly affected by aging or dirt such as soot on the inner wall surface of the same path after long-term use, and highly reliable characteristics of the temperature sensor 5 without malfunction can be obtained.
In addition, the heat due to radiation is transferred to the vaporizing section 1 of the lower lamp wick 11.
1a for preheating, it helps vaporize the fuel from the vaporizing section 11a. Furthermore, since almost no red heat from the upper ejector baffle plate 3 is reflected by the black painted surfaces 1a, 4a, it is not visible from the air outlet 6 and does not give the user a strange sense of anxiety.

In addition, in the above embodiment, the inner wall of the route is painted black 4.
a, 1a were applied to the ejector tube 4 and main body 1, but depending on the shape and conditions, black coating 4a, 1a may be applied.
a may be only part of the ejector tube 4 and the inner wall of the main body 1.

In this manner, the present invention maintains the usage characteristics of the instrument for a long period of time from the initial stage, and the operation of the instrument itself becomes stable.

[Brief explanation of the drawing]

The figure is a side sectional view showing one embodiment of the present invention. 1... Main body, 4... Ejector tube, 12... Combustion tube (burner), A... Combustion chamber.

Claims (1)

[Claims] 1. In an open type heater that has a convection blower and mixes the airflow from the convection blower with combustion exhaust gas from a burner and releases the mixture directly into the heating space, a temperature sensor is provided in the combustion exhaust gas path, and a temperature sensor is installed in the combustion exhaust gas path. A hot air heater with heat-resistant black coating applied to the entire or part of the inner surface.