JP2867685B2 - Combustion device with built-in hot water heat exchanger - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device with a built-in hot water heat exchanger mainly used as a household floor heating stove or the like.

2. Description of the Related Art Generally, as shown in FIG. 3, this type of heat exchanger built-in type combustion apparatus includes a burner 1, a combustion cylinder 2, a hot water heat exchanger 3 provided downstream of the combustion cylinder 2, and an exhaust gas. The hot water heat exchanger 3 is provided with an opening 4 and a hot water passage 5 is provided inside.
At the bottom of the hot water heat exchanger 3, there is provided a drain pipe 7 for removing weakly acidic dew water generated in the hot water heat exchanger 3, and the dew water is collected in the hot water heat exchanger 3 Prevents the surface from corroding. This drain pipe 7 is provided with a dew-condensed water receiving container 8 at an outlet portion, and water 9 is put therein to prevent the outlet portion of the drain pipe 7 from opening to the atmosphere.
So that it does not leak through the room.

Problems to be Solved by the Invention However, in the conventional technology, the dew water receiving container 8 for storing the dew water removed from the heat exchanger must be provided outside the combustion device, and the dew water receiving container 8 inside the dew water receiving container 8 must be provided. If the outlet of the drain pipe 7 is opened to the atmosphere due to a decrease in water due to drying or the like, there is a risk that the exhaust gas leaks into the room from the outlet of the drain pipe 7.

The present invention has been made in view of such a point, and an object of the present invention is to eliminate the dew condensation water receiving container and to improve safety at the same time.

Means for Solving the Problems According to the present invention, in order to achieve the above object, a hot water heat exchanger is provided at its bottom with an evaporating tube for extracting dew water generated in the hot water heat exchanger. Alternatively, a condensed water evaporator for evaporating the condensed water by heating the whole or a part of the path and providing a condensed water evaporator is provided, and the outlet of the evaporator tube is provided. It is configured to face the exhaust port and discharge the exhaust gas together with the high-temperature exhaust gas from the supply / exhaust cylinder to the outside of the room.

Operation The present invention is configured such that all of the dew condensation water generated in the heat exchanger is evaporated by the high-temperature evaporating pipe by the above-described configuration, and the steam is discharged from the supply / exhaust tube to the outside together with the high-temperature exhaust gas. Water can be discharged outside without accumulating in the hot water heat exchanger. Therefore, not only does the weakly acidic dew water not corrode the metal surface, but the dew water container can be eliminated, and water is always put into the dew water container, and the drain pipe outlet is exposed to the atmosphere. It is not necessary to prevent the exhaust gas from opening, and the water does not decrease so that the exhaust gas does not leak into the room.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

1 and 2, 10 is a burner for burning liquid fuel, 11 is a fuel pump for sending fuel to the burner 10, 12 is a blower for sending combustion air to the burner 10, and 13 is a fan from the blower 12 to the burner 10. It is an air passage. Above the burner 10, a combustion tube 15 having a red-hot body 14 therein is continuously provided, and a main body radiator 17 having an exhaust gas switching damper 16 is connected downstream of the combustion gas passage of the combustion tube 15. is there. Reference numeral 18 denotes a heat-resistant glass attached to the front surface of the combustion tube 15 for radiating light and heat of the red heater 14 to the front of the stove through an opening in the front surface of the main body. 19 is the exhaust gas switching damper 16
A hot water heat exchanger connected to the combustion tube 15 via a circulating water passage 20 inside the exhaust gas switching damper.
By 16, the flow of the combustion gas is selected to be either the main body radiator 17 or the hot water heat exchanger 19.

The outlet 19a of the hot water heat exchanger 19 merges with the outlet 17a of the main body radiator 17, and connects the outlet 21 to the merged portion.
Further, exhaust gas is discharged outside the room by a supply / exhaust tube 22 connected to the exhaust port 21.

This hot water heat exchanger 19 is provided with an inclined portion 23 at the bottom thereof,
An evaporating pipe 24 for taking out condensed water generated inside is connected to the dew water outlet 23a at the lowest part. And the evaporator tube 24
Is provided with a dew condensation water evaporator 26a closely attached to the wall thereof by an evaporator holding member 26b so as to receive heat generated in the burner 10 or the combustion tube 15 in the middle thereof, and an evaporator outlet 27 is provided with a hot water heat exchanger. It is open outside of 19 so as to face the exhaust port 21. The opening direction of the evaporating tube outlet 27 is the exhaust port.
The flow direction of the exhaust gas flowing through the exhaust gas 21 is the same as that of the exhaust gas, and the condensed water that has turned into steam is easily discharged to the exhaust port 21 by the flow of the exhaust gas.

The circulating water passage 20 has one connected to the hot water return port 28 and the other connected to the sub-tank 29,
From the circulating pump 30, the water is sent from the hot water outlet 31 to an external radiator such as a floor heating panel (not shown) by the circulation water pump 30 and returns to the hot water return port 28 again.

The operation will be described above. First, when floor heating and stove radiant heating are operated at the same time, the burner 10
Combustion is started by the liquid fuel sent from 11 and the combustion air sent from the blower 12 through the air passage 13.

The combustion gas first heats the glowing body 14 above the burner 10 to glow red. At this time, the glowing body 14 emits the heat and light to the combustion tube 15
Radiates from the heat-resistant glass 18 attached to the front through the front opening of the main body.

On the other hand, the circulation pump 30 starts operating simultaneously with the start of combustion for floor heating, and after a predetermined time, the exhaust gas switching damper 16 moves from the stove alone operation side to the floor heating side (the state indicated by the solid line in the figure). Is switched.

As a result, the combustion gas that has passed through the inside of the combustion cylinder 15 is
It flows to the hot water heat exchanger 19 and heats the circulating water passage 20 therein. The circulating water passage 20 is flowed by a circulating water circulating pump 30 for floor heating, and the circulating water is heated and turned into hot water.
And returns to the hot water return port 28 again to circulate.

The combustion gas that has passed through the hot water heat exchanger 19 is
The gas flows from a to the exhaust port 21 and is exhausted as exhaust gas through the air supply / exhaust tube 22 to the outside of the room. During the floor heating operation, the exhaust gas switching damper 16 switches the combustion gas to the main body radiator 17 or the hot water heat exchanger 19 to control the hot water temperature.

Here, during this floor heating operation, inside the hot water heat exchanger 19, the circulating water passage 20 through which the combustion gas flows is circulating water.
, The water vapor component of the combustion gas may condense.

This condensed water falls to the bottom of the hot water heat exchanger 19,
And enters the evaporating tube 24 from the dew condensation water outlet 23a and directly reaches the dew condensation water evaporator 26a. The condensed water is efficiently heated and becomes steam in a dew condensation water evaporating section 26a disposed in close contact with a high-temperature section such as a combustion tube, and is ejected from an evaporating pipe outlet 27 facing the exhaust port 21. The exhaust gas is discharged through the supply / exhaust tube 22 together with the hot exhaust gas. As a result, the dew water does not stay inside the hot water heat exchanger 19 for a long time, and the metal surface is not corroded by the weakly acidic dew water. Furthermore, a drain pipe for discharging the dew condensation water outside the main body, a dew condensation water receiver, and water for keeping the outlet of the drain pipe from opening to the atmosphere are unnecessary, and this water is reduced, and exhaust gas is discharged from the drain pipe. No more leaking into the room.

In this embodiment, the stove alone can be operated without heating the floor, but in this case, the circulation pump 30 is not operated, the exhaust gas switching damper 16 closes the hot water heat exchanger side, and The combustion gas flows into the radiator 17.

By the way, the above embodiment has been described with reference to the heat exchanger for floor heating using hot water. However, the present invention is not limited to the floor heating and may be another radiator.

The fuel may be a gaseous fuel instead of a liquid fuel. Further, in the above embodiment, the combined use type with the heating device by the radiation is described, but the combined use type with the heating device by the hot air or the combustion device only with the hot water heat exchanger may be used.

As described above, according to the present invention, during the floor heating operation, the condensed water generated inside the hot water heat exchanger is evaporated by the evaporating pipe arranged in close contact with a high-temperature portion such as a combustion tube, and the steam is vaporized. Drains together with high-temperature exhaust gas, so that it does not accumulate inside the hot water heat exchanger, eliminating corrosion of the metal surface due to weakly acidic dew water, as well as a drain pipe for discharging dew water outside the main unit This eliminates the need for water to keep the outlet of the dew condensation container and the drain pipe open to the atmosphere, and reduces the amount of water so that exhaust gas does not leak into the room through the drain pipe and is safe. In addition, since the dew-water evaporating section of the evaporating tube uses a high-temperature section such as a combustion tube, a high-speed heat source is not required, so that the configuration can be simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a combustion device with a built-in hot water heat exchanger according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA ′ of FIG.
FIG. 3 is a sectional view of a conventional combustion device with a built-in hot water heat exchanger. 10 burner, 15 combustion cylinder, 16 exhaust gas switching damper, 17 body radiator, 19 hot water heat exchanger, 20 circulating water passage, 21 exhaust port, 24 evaporation Pipe, 26a …… Condensation water evaporation section.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masayuki Fujimoto 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References 101240 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24D 3/00 F24C 13/00 F24H 6/00

Claims (1)

(57) [Claims] A burner, a combustion cylinder, a hot water heat exchanger provided in an exhaust gas passage from the combustion cylinder, and an exhaust port;
The hot water heat exchanger is provided at its bottom with an evaporating tube for extracting dew water generated in the hot water heat exchanger, and the evaporating tube is configured to be in close contact with a high temperature portion such as a combustion tube or an exhaust gas passage from the combustion tube. A condensed water evaporator for evaporating the condensed water by heating the whole or a part of the path is provided, and the outlet of the evaporator tube is exposed to the exhaust port, and the exhaust gas is discharged from the supply / exhaust cylinder together with the high temperature exhaust gas. A combustion device with a built-in hot water heat exchanger that discharges.