JP3140240U - Solid fuel heater using a descending smoke tube heat exchanger - Google Patents

Abstract

The present invention provides a solid fuel heater that is compact, has high thermal efficiency, quiet operation noise, low price, and high comfort.
SOLUTION: A plurality of tubes provided beside the fire chamber are used as heat exchangers to cool the exhaust while it is guided to the exhaust fan at the lower rear, and the heat is used to improve the thermal efficiency. Because of its low flow resistance, low-cost and quiet axial fans can be used.
[Selection] Figure 1

Description

The present invention is provided with a descending smoke pipe type heat exchanger that is provided with a plurality of pipes for lowering the exhaust gas burned in the fire room and introducing it to the exhaust fan provided at the lower part, which is used as a heat exchanger. It relates to a solid fuel heater used.

Conventionally, heating appliances that use solid fuel, such as wood stoves and coal stoves, use radiant heat and exhaust by the chimney effect. In recent highly insulated and airtight houses, it is difficult to exhaust due to the chimney effect due to the pressure difference with the outside air, etc., and it takes time to ignite and extinguish, and in particular, extinguishing is a process of waiting until it burns out. There is recognition that heating equipment that uses fluid fuel is inferior in convenience and safety.

Wood-based fuels that use thinned or timber waste are recyclable as forests compared to fossil fuels, and are attracting attention as fuels that have less impact on the environment, such as not producing harmful substances such as SOx. In order to reduce the shortcomings in the previous section, a heater that uses solid fuel called pellets made from pulverized wood that has been consolidated into granules has appeared. This is a heating appliance provided with forced air supply and exhaust (FF), Japanese Patent Application Laid-Open No. 2004-138257.
and so on.

When fluid fuel is burned with a burner, the flame is small and stable, and can be turned sideways. However, with solid fuel, the flame is largely unstable and needs to be burned upward. For this reason, it is necessary to make the fire chamber long and long with solid fuel.

Japanese Patent Application No. 2005-8988, Japanese Patent Application Laid-Open No. 2004-138257, and the like have a pipe through which hot air is passed above a large firebox, and this is used as a heat exchanger.
Since the heat exchanger is significantly lower in temperature than the flame, it will generate soot when it comes into contact with the inner flame, but if there is a heat exchanger in the lower part of the fire chamber, it will not be able to rise to the height where the flame will burn out enough, The heat exchanger cannot be enlarged.

Also, since there is a fuel tank at the upper rear of the main unit, the fan for supplying warm air is at the lower rear of the main unit, and the heat exchanger is near the upper front end of the main unit,
It is necessary to use a centrifugal fan with a low specific speed because of its long path and high flow resistance. However, a centrifugal fan has a large operating noise, is expensive, and is large. In the case of using in the above, a large flow rate cannot be obtained, and as a result, it is a major factor that reduces thermal efficiency in combination with a small heat exchanger.

No. 2005-8988 JP 2004-138257 A

  To provide a solid fuel heater with small size and high thermal efficiency.

  To provide a solid fuel heater with quiet operation.

The solid fuel heater according to claim 1 of the present invention is not provided with a heat exchanger in the firebox, and is provided with a plurality of pipes that guide the exhaust fan at the rear lower portion from the upper end of the firebox on the side of the firebox,
This is characterized in that it is used as a heat exchanger.

In the solid fuel heater according to claim 2 of the present invention, since the flow path of the air used as the warm air is thick and short, the flow resistance is low, so that an axial fan having a high specific speed and a quiet sound can be used. Therefore, the sound is quiet, and the heat efficiency is good because a large flow rate can flow.

The solid fuel heater of the present invention is economical because of its high thermal efficiency, and has less burden on the environment because it does not emit excess carbon dioxide.
When used as a pellet stove, valuable forest resources can be used without waste.

  The solid fuel heater of the present invention is suitable for home use because of its quiet sound.

  Since the solid fuel heater of the present invention uses a small fan and is inexpensive, it can be designed to be downsized and the manufacturing cost can be reduced.

  Since the solid fuel heater of the present invention has a heat exchanger at a low position, it is possible to blow warm air from the lower part of the front surface, and since it warms from the feet, the comfort is high.

The solid fuel heater of the present invention has high thermal efficiency, quiet sound, can be miniaturized, is warm from the feet, is comfortable, and is ideal for home use. In the case of a pellet stove, it can greatly promote the spread of environmentally friendly pellet stoves.

  The example of the pellet stove which is an example of the solid fuel heater of this invention is demonstrated using FIG.1 and FIG.2.

The fuel supply and ash discharge system will be described with reference to FIG. Pellets are supplied to the pellet tank 6. Fuel pellets are supplied by the feeder 7
, And supplied through the chute 8.

The flow of combustion and exhaust will be described with reference to FIG. The flame 3 caused by the combustion in the combustion pot 4 burns out while rising up to the top of the fire chamber 2 without resistance.
The exhaust gas is divided into left and right at the top of the fire chamber 2 and is guided to the top of the heat exchanger 1 provided on both sides of the fire chamber 2.
In this pellet stove, the heat exchanger is installed on both sides, but it may be on one side.

While the exhaust gas passes through the heat exchanger 1 composed of a plurality of tubes on the left and right sides of the fire chamber 2 and goes to the exhaust fan 10,
It is cooled by the wind of the hot air fan 11 located behind the main body.
The wind that has obtained the heat of the exhaust becomes warm air 12 and is ejected from the lower front of the main body.

The solid fuel heater of the present invention has high thermal efficiency, quiet sound, can be miniaturized, is warm from the feet, is comfortable, and is ideal for home use. The heat exchanger used in this heater can obtain the above-mentioned advantages even if it is used other than pellet fuel.

It is a top view of the pellet stove by one Embodiment of this invention. It is a side view of the pellet stove by one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger which consists of several pipes 2 Fire chamber 3 Flame 4 Combustion pot 5 Flow of exhaust 6 Pellet tank 7 Pellet supply device 8 Chute 9 Ash receiver 10 Exhaust fan 11 Hot air fan 12 Hot air

Claims (2)

A heater that uses a solid fuel with a fire chamber, exhaust fan, fuel supply device, heat exchanger inside the main body, next to the fire chamber,
A solid fuel heater using a descending smoke pipe type heat exchanger that uses a plurality of pipes through which exhaust goes down and uses them as a heat exchanger. A solid fuel heater using the heat exchanger according to claim 1 of the present invention, wherein the operation noise is reduced by using an axial fan as the hot air fan.

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