JPS5833496Y2 - Combustion hot air heater - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a combustion hot air heater equipped with an abnormal temperature sensing element as a safety device.

FIG. 1 shows a conventional heater of this kind (Utility Model Application No. 72964/1983).

That is, a is a fuselage body, and a heat exchanger kcs' containing a burner b is housed in the fuselage a, and a circulation fan d is provided below the heat exchanger c.

The air sent out from the circulation fan d exchanges heat with the heat exchanger C to become warm air, and this warm air is sequentially discharged from the discharge port e.

An abnormal temperature sensing element f is provided in the upper part of the interior of the aircraft body a,
This element f is housed in a box a that is open on only one surface parallel to the hot air flow, and senses the average atmospheric temperature throughout the interior of the aircraft a, thereby ensuring safety. That's what I'm trying to do.

However, if such a configuration were to fail, even if burner B causes abnormal combustion or a failure occurs that causes circulation fan d to stop or reduce its rotation speed, the atmospheric temperature inside aircraft a would rise. There is a relatively long time delay before this occurs, and this system, which detects abnormalities based on ambient temperature, has the disadvantage of being less safe.

This invention was made with attention to these points, and its purpose is to provide a combustion hot air heater that can quickly detect an abnormality.

The configuration of this invention is that a combustion section and a circulation fan are provided inside the aircraft, an exhaust pipe is led out from the combustion section via a heat exchanger, and the air sent from the fan is converted into warm air by the heat exchanger. Regarding the discharge device, an abnormal temperature sensing element is disposed in the body of the airframe in the air flow area of the circulation fan and facing the combustion section end and the exhaust pipe, respectively. It is.

According to such a configuration, when the circulation fan fails, the temperatures of the combustion part and the exhaust pipe immediately rise, and the abnormal temperature sensing element receives radiant heat from both, so that the abnormality can be immediately detected.

Furthermore, even if abnormal combustion occurs in the combustion section, the combustion section and the exhaust pipe immediately rise, so the abnormality can be immediately detected, and safety can therefore be greatly improved.

An embodiment of this invention will be described below with reference to the second rotation and FIG. 3.

In the figure, reference numeral 1 denotes the body of a box-shaped heater, and within this body 1 a combustion tube 2 serving as a combustion section is provided.

This combustion tube 2 is equipped with a pot-type burner 3 at the inner bottom, and a fuel supply pipe 4 from a fuel tank (not shown) is connected to the burner 3.
is introduced via the oil amount regulator 5.

Then, a fixed amount of fuel such as kerosene is supplied to the burner 3 via the oil amount regulator 5, and as it vaporizes, it is ignited by the ignition heater 6, and the flame is regulated by the combustion ring T, which burns it. A casing 8 is provided on one side of the interior of the casing 8, and the interior thereof is divided into a motor chamber 9, an air supply chamber 10, and an exhaust chamber 11. A combustion motor 12 is installed in the motor chamber 9. The rotating shaft faces the air supply chamber 10 and the exhaust chamber 11.

Then, an air supply fan 1 is attached to this rotating shaft, facing toward the air supply chamber 10.
3 is placed in the exhaust chamber 11, and an exhaust fan 14 is coaxially attached thereto.

The air supply chamber 10 is communicated with the outside of the house via an air supply path 15 passing through the motor room 9, and the exhaust chamber 11 is communicated with the outside of the house via an exhaust path 16.

Furthermore, an air supply pipe 17 leads out from the air supply chamber 10 and is connected to the lower part of the burner 3.

Additionally, a heat exchanger 18 is provided at the upper end of the combustion tube 2 and communicates with the combustion tube 2.
is attached, and an exhaust pipe 19 is connected from the end of this heat exchanger 18.
The end of the exhaust pipe 19 is connected to the end face of the exhaust chamber 11 and communicates with the chamber.

The exhaust pipe 19 is formed in a wide flat shape as shown in FIG. 3, and is interposed between the combustion motor 12 and the combustion cylinder 2, and the flat surface isolates the two.

A circulation fan 20 is provided at the back of the heat exchanger 18,
An abnormal temperature sensing element 21 made of a temperature fuse or the like is attached to a portion of the fan 20 in the air flow region a and facing the combustion tube 2 and the exhaust pipe 19, respectively.

This element 21 senses the ambient temperature, and when the temperature reaches a certain temperature or higher, the combustion operation circuit is opened and the operation is stopped.

Furthermore, 22 is an opening window formed in the front of the body 1 for discharging hot air.

As a result, the air supply fan 13 button and the exhaust fan 14 are rotated by the drive of the motor 12, and first, the air supply fan 13 sucks outdoor air into the air supply chamber 10 through the air supply path 15, and this air is blown to the lower part of the burner 3 via the air supply pipe 17.

The air then flows into the burner 8 through a large number of holes drilled in its circular surface and is consumed as combustion air.

Further, exhaust gas accompanying combustion in the combustion tube 2 is sucked into the exhaust chamber 11 through the heat exchanger 18 and the exhaust pipe 19 by the rotation of the exhaust fan 14, and is discharged outside the room by valving the exhaust passage 16.

On the other hand, the indoor air of the house is circulated by the circulation fan 20, and as it passes around the heat exchanger 18, it exchanges heat with the heat exchanger 18 to become warm air, heating the room.

Since the abnormal temperature sensing element 21 is disposed in a region a of the air sent out by the circulation fan 20 and in a region facing the combustion tube 2 and the exhaust pipe 19, it receives the radiant heat of the combustion tube 2 and at the same time receives the radiant heat of the combustion tube 2. A cooling effect is provided by the air sent out by the circulation fan 20.

Although the sent air itself is warm air, its temperature is much lower than the radiant heat of the combustion tube 2, and therefore the abnormal temperature sensing element 21
is cooled in a relative sense.

If we now consider a case where the air blown out by the circulation fan 20 becomes large or slightly abnormal due to voltage fluctuations or the like from this state, first, the cooling effect on the abnormal temperature sensing element 21 decreases due to the decrease in the air blown out itself.

At the same time, since the heat exchange rate between the delivered air and the heat exchanger 18 decreases, the temperature of the combustion node 2 and the exhaust pipe 19 increases, and the radiant heat to the abnormal temperature sensing element 21 increases due to both of them.

Due to the synergistic effect of the decrease in the cooling effect and the increase in radiant heat, the amount of heat generated by the tube shrinkage of the abnormal temperature sensing element 21 increases significantly, so that the occurrence of an abnormality (reduction in the amount of air blown) can be detected extremely sensitively.

That is, in addition to the increase in radiant heat, the cooling effect is reduced, resulting in a marked improvement in sensitivity.

This effect is the same even in abnormal situations where the circulation fan 20 stops due to a failure or the like and no air is blown.

On the other hand, if we talk about the case where the burner 3 is damaged and abnormal combustion occurs and the combustion tube 2 rises excessively, in this case, first the combustion tube 2
Its own radiant heat increases.

As the combustion node 2 rises too much, the heat exchanger 18 also rises too much, so the temperature of the air sent out by the circulation fan 20 also rises, and the temperature of the exhaust pipe 19 also rises.

An increase in the temperature of the delivery air means that the cooling effect on the abnormal temperature sensing element 21 is reduced, and therefore the abnormal temperature sensing element 21 receives large radiant heat from both the combustion node 2 and the exhaust pipe 19, and the temperature of the delivery air decreases. Therefore, as in the case of souvenirs, the occurrence of an abnormality (abnormal combustion) can be detected extremely sensitively.

In addition, since the abnormal temperature heat sensitive element 21 receives heat from both the combustion tube 2 and the exhaust pipe 19 when an abnormality occurs, the amount of heat generated by the tube contraction increases significantly compared to normal conditions, and the difference between them becomes large. The operating temperature of the sensing element 21 can be set to a higher temperature, which allows the abnormal temperature sensing element to be activated when fluctuations occur in the rotational operation of the fan 20 or the thermal power operation of combustion within the normal operating range. This has the advantage of being able to prevent the occurrence of problems such as erroneous operation of the 21.

As explained above, according to this invention, an abnormal temperature sensing element is provided in the outlet air region of the circulation fan and in the exhaust pipe facing the combustion part and the exhaust pipe, so that abnormalities in the circulation fan or the combustion part can be detected. The present invention has the advantage that safety can be greatly improved by quickly sensing the abnormal temperature, and that malfunctions can be prevented by setting the operating temperature of the abnormal temperature sensing element to a high temperature.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional combustion hot air heater, Fig. 2 is a block diagram showing an embodiment of this invention, and Fig. 3 is a block diagram of a conventional combustion hot air heater.
It is a block diagram which shows the cross section along a line. 1... Airframe, 2... Combustion tube (combustion part), 20...
Circulation fan, 21... Abnormal temperature sensing element, a...
Sending wind basin area.

Claims (1)

[Scope of utility model registration request] Suitable for systems in which a combustion part and a circulation fan are provided in the fuselage, an exhaust pipe is led out from the combustion part through a heat exchanger, and the air sent out by the fan is converted into warm air by the heat exchanger and then discharged. . A combustion hot air type heater, characterized in that abnormal temperature sensing elements are disposed in the body of the body in the air flow area of the circulation fan and in the parts facing the combustion part end and the exhaust pipe, respectively.