JPH0366571B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a furnace that slowly burns wood fuel such as wood and wood, and heats air using the combustion heat to produce hot air for heating.

Conventional technology Conventional heating furnaces that use wood as fuel were developed in 1982.
This is disclosed in Publication No. 75666, in which a combustion chamber 1 is provided with a combustion port 5 and an ash outlet/air intake port 6 at the front, and an air space is formed between an outer cylinder a and an inner cylinder b. A spiral air passage 3 is formed by attaching a spiral piece 2 in the air, a blower 14 is attached to the front end of the air passage 3, and the rear end is connected above the combustion chamber 1. The heat exchanger 18 is connected to the rear end of the heat exchange chamber 16 attached to the rear end of the heat exchange chamber 16, and inside the heat exchange chamber 16, a heat exchanger 18 is installed in which the collecting cases c and d at both ends are joined by a plurality of smoke pipes e, and the rear collecting case d A chimney 19 is connected to the front collecting case e, and a hot air outlet 22 is provided at the front end of the heat exchange chamber 16. By burning it and exchanging the combustion heat with air, it is possible to continuously generate warm air suitable for heating over a long period of time.

Problems to be Solved by the Invention In the conventional heating furnace described above, a spiral air supply path is formed between the inner cylinder and the outer cylinder in the combustion cylinder, so that the air flow distance and flow time are extended. However, the formation of the spiral flow path requires high manufacturing costs because it is not easy to form the spiral piece and attach it, and the spiral flow of air is difficult to resist. Because of the large size, a high-pressure blower is required, and since the airflow is laminar and the state of contact with the inner and outer cylinders does not change, the inner layer absorbs heat from the inner cylinder and is effectively heated. Since the outer layer is only slightly heated by thermal radiation, the heating effect is poor, and even if the air flow path is lengthened, the production and power costs are high and the heat recovery efficiency is not improved. Furthermore, there was a problem in that there was a lack of combustion air in the rear part of the combustion chamber, resulting in incomplete combustion of the fuel, which not only produced soot and tar but also left unburned fuel.

The present invention was made in order to solve the above-mentioned conventional problems, and by forming a wind passage that causes turbulent flow at the corners between the combustion chamber and the cover tube, the manufacturing cost is low. The object of the present invention is to provide a heating furnace using wood or the like as a fuel, which has a high heat recovery rate and performs complete combustion without leaving any unburned fuel.

Means for Solving the Problems As shown in the embodiments of FIGS. 1 to 3, the heating furnace according to the present invention is provided with a firing port 3 and an ash outlet/primary air intake port 4 at the front, and a heating furnace at the rear. a combustion chamber 1 provided with a secondary air intake port 8, and communicated with the combustion chamber 1 through several through holes 10 provided above the combustion chamber 1;
A heat exchanger 9 with a chimney 12 connected to one end, a cover tube 1 with a polygonal cross section installed around the combustion chamber 1 and its outside.
a heat exchange chamber 17 provided on the outside of the heat exchanger 9 and communicated with the air passage 15; Warm air outlet 19 provided at an appropriate location in chamber 17
The present invention relates to a heating furnace that uses wood or the like as fuel and includes a blower 16 provided on one side of the cover tube 14 to blow air into the air passage 15.

Function The heating furnace configured as described above has a combustion chamber 1
When fuel such as wood is supplied from the combustion chamber 3 and ignited, the fuel is supplied from the primary air intake 4 at the front of the combustion chamber 1, and air is supplied from the secondary air intake 8 at the rear of the combustion chamber 1. Therefore, sufficient combustion air is obtained for complete combustion, and the fuel gas rises to the heat exchanger 9 through the vent 10 and is discharged from one end to the chimney 12, so when the combustion starts, the blower 16 is turned on. When the air is blown into the air passage 15 during operation, the air is divided into two parts and flows along the circumferential surface of the combustion chamber 1.
5, there are several corners a of the cover tube 14 with a polygonal cross section, and these corners a disturb the laminar flow of air to make it turbulent, so that the entire air flows directly into the combustion chamber 1. In order to make contact and receive heat transfer, the air is almost uniformly heated by combustion heat while passing through the air duct 15 and rises to the heat exchange chamber 17, and the air passes through the air duct 15 between the heat exchanger 9 and the heat exchanger 9. 18 is heated by the combustion gas, and when it becomes warm air suitable for heating, it is supplied from the outlet 19 to greenhouses, plastic greenhouses, etc.
On the other hand, the combustion gas that has reached the heat exchanger 9
Due to the low flow rate and lack of oxygen inside, the sparks that get mixed in are digested and recovered, and only the gas is released to the outside.

Embodiments The present invention will be described in detail below based on embodiments shown in the drawings.

1 to 3 of the drawings, reference numeral 1 denotes a combustion chamber, which is formed into a cylindrical shape that is easy to manufacture and does not easily undergo thermal deformation, and has a combustion opening 3 equipped with an opening/closing lid 2 at the upper part of its front wall.
An ash outlet/primary air intake 4 is provided at the bottom, an opening/closing lid 5 is attached to this intake 4, and this opening/closing lid 5 has an air hole 7 whose opening degree can be adjusted by moving a sliding plate 6.
A secondary air intake port 8 is provided at the lower part of the rear wall.

Reference numeral 9 denotes a heat exchanger, which is formed into a rectangular tube shape and whose lower surface is communicated with the upper part of the combustion chamber 1 described above through several through holes 10.The front end of the heat exchanger 9 is opened for cleaning. An opening/closing lid 11 is attached thereto, and a connecting portion 13 for a chimney 12 is provided at the rear end.

Reference numeral 14 denotes a cover tube for the combustion chamber 1, which is formed to have a polygonal cross section, and has an air passage 15 having several corners a for causing air turbulence between it and the combustion chamber 1. .

16 is provided on one side of the cover tube 14 to connect the air passage 1.
5, a low-pressure type air blower can be used because of the air passage 15 having the corner a.

Reference numeral 17 denotes a heat exchange chamber, which is formed into a rectangular shape to match the heat exchanger 9 described above, and has a narrow air passage 18 having a bent part b between it and the heat exchanger 9. It communicates with the air passage 15, and furthermore, in the center of one side of the heat exchange chamber 17, there is a hot air outlet 19.
An exhaust temperature gauge 20 is attached to the outlet port 19.

Reference numeral 21 denotes a hot water chamber attached to the back surface of the combustion chamber 1, with circulation water pipes 22 and 23 connected above and below the chamber, and heated to supply hot water when water is circulated inside.

Effects of the Invention The heating furnace using wood or the like as fuel according to the present invention is provided with a wind passage that generates air turbulence at the corner between the combustion chamber and the cover tube. The manufacturing cost is low because it can be done just by using a polygonal cover tube.

By creating turbulence in the air at the corners, the air flowing through the air duct will almost uniformly come into contact with the inner cylinder, allowing it to be effectively heated by heat transfer, allowing for sufficient heat recovery even if the air duct is short. Since the air blowing resistance is small, it is possible to blow the air with a low-pressure blower.

Since secondary air is supplied from the rear of the combustion chamber, the fuel receives sufficient combustion air even deep within the combustion chamber for complete combustion, without producing any unburned remains, soot, or tar.

When the combustion gas exits the heat exchange chamber through the vents, the flow rate decreases, and this chamber is deficient in oxygen, so even if sparks come out of the combustion chamber, the sparks disappear in the heat exchange chamber and are released from the chimney. There is no.

It has the following unique effects.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a heating furnace using wood or the like as fuel according to the present invention. Figure 2 is a longitudinal sectional front view of the same as above. FIG. 3 is a longitudinal sectional side view of the same as above. In the figure, 1 is the combustion chamber, 3 is the combustion opening, 4 is the ash outlet and primary air intake, 8 is the secondary air intake, 9 is the heat exchanger, 10 is the through hole, 14 is the cover tube, and 15 is the wind road, a is the corner, 17 is the heat exchange room, 19 is the hot air outlet, 16
is a blower.

Claims (1)

[Claims] 1. A combustion chamber with a combustion opening and an ash outlet/primary air intake in the front, and a secondary air intake in the rear;
between a heat exchanger provided above the combustion chamber and communicated with the combustion chamber through several holes and connected to a chimney at one end; and a cover tube with a polygonal cross section disposed around the combustion chamber and the outside thereof. a wind duct provided at the corner of the covering tube to generate air turbulence; a heat exchange chamber provided outside the heat exchanger and communicated with the air duct; and a heat exchange chamber provided at an appropriate location in the heat exchange room. 1. A heating furnace using wood or the like as fuel, characterized in that the heating furnace is equipped with a warm air outlet, and a blower provided on one side of the cover tube to blow air into the air duct.