JPH04124A - Stove having hot water heat exchanger - Google Patents

Abstract

PURPOSE:To eliminate means for preventing dew formation in which an air ratio is increased when a hot water heating is carried out to facilitate moisture in combustion gas to be dewed on the surface of a hot water heat exchanger and the air ratio is decreased when the hot water is not heated by a method wherein a changing-over damper and a secondary air damper are cooperated to each other. CONSTITUTION:When a floor heating is operated, a changing-over damper 18 changes over a combustion gas to either a main heat exchanger 9 or a hot water heat exchanger 13 and controls a hot water temperature. The secondary air damper 6 is also moved concurrently with a link rod 19. Combustion gas flows to the hot water heat exchanger 13 to heat a hot water pipe 12, resulting in that an amount of secondary air is increased and in turn when the hot water pipe 12 is not heated, the amount of secondary air is reduced. When the hot water pipe 12 is heated, the air ratio is increased, the moisture in the combustion gas is not dewed on a surface of the hot water pipe 12 and further only the secondary air is increased, so that it does not deteriorate the discharging gas characteristic. When the combustion gas flows toward the main heat exchanger 9, the air ratio is low, the heat exchanging efficiency at the main heat exchanger 9 is high and a satisfactory heat exchanging is carried out by the main heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates primarily to a stove with a built-in hot water heat exchanger for home use.

Conventional technology In recent years, stoves that mainly use radiant heating have been equipped with a built-in hot water heat exchanger for simple hot water floor heating to improve the temperature distribution in the room, and the stove and floor heating can be operated simultaneously. Alternatively, devices that allow the option of operating only the stove have been developed and come into use.

Conventionally, in this type of stove, as shown in FIG. 4, a combustion tube 32 is connected above a burner 31, and a main heat exchanger 33 is connected to the combustion tube 32. Fuel is sent to the burner 31 by a fuel pump 34 and combustion air is sent to the burner 31 by a blower 35. A hot water heat exchanger 37 having a hot water vibe 36 inside is branched from the middle of the main heat exchanger 33, and a damper 3 that switches the flow of combustion gas is provided at the branch part.
8 is provided and is configured to control the combustion gas passing through the hot water heat exchanger 37 and adjust the temperature of the hot water. Further, the hot water heat exchanger 37 has an outlet portion in contact with the main heat exchanger 35 and communicates with an exhaust portion 39 . Also,
The second stove has a built-in sub-tank 40 for hot water and a circulation pump 41 to circulate hot water to a floor heating panel (not shown).

In the stove configured as described above, when floor heating and radiant heating from the stove are operated simultaneously, the fuel pump 34 and the blower 35 are started, the fuel is burned by the burner 31 to form a flame, and the generated combustion gas After passing through the combustion tube 32, when the damper 38 is open on the hot water heat exchanger 37 side, the water passes through the hot water heat exchanger 37, heats the hot water pipe, and warms the water flowing therein. The heated water is sent to the floor heating panel by the circulation pump 41 to perform floor heating.

At this time, the damper 38 rotates toward the hot water heat exchanger 37 side or the main heat exchanger 33 side to control the temperature of the hot water. In addition, in this type of stove, the circulation pump 41 is not operated, the damper 38 is rotated to the main heat exchanger 33 side, and the hot water heat exchanger 37 side is closed, and the radiant heating from the stove is performed without performing floor heating. It is also now possible to do just that. When the stove is operated independently, the combustion gas does not flow to the hot water heat exchanger 37, and the main heat exchanger 33
Heat is exchanged only by the exhaust gas.

Problems to be Solved by the Invention In such a conventional stove with a built-in hot water heat exchanger, the combustion gas passing through the hot water heat exchanger 37 is
Since the temperature of the hot water pipe 36 in the hot water pipe 36 is low, moisture in the combustion gas tends to condense on the surface of the hot water pipe 36. To prevent condensation, the air ratio during combustion is increased (by increasing the amount of excess air). ) The concentration of moisture in the combustion gases had to be reduced.

However, when operating the stove alone without floor heating,
Heat must be exchanged only by the main heat exchanger 33, and if the air ratio is increased more than necessary as described above, complete combustion will become difficult and the exhaust gas characteristics will deteriorate, and the heat exchange efficiency will deteriorate. A means to improve the heat exchange efficiency in the raw heat exchanger 33 was also required.

The present invention solves the above-mentioned problems.It burns at a high air ratio without deteriorating the exhaust gas characteristics during floor heating operation, prevents dew condensation in the hot water heat exchanger, and also allows the stove to be heated without underfloor heating operation. During standalone operation, the aim is to avoid increasing the air ratio more than necessary and to avoid deteriorating heat exchange efficiency (the main heat exchanger as in the past can be used satisfactorily).

Means for Solving the Problems In order to achieve the above object, the present invention includes a burner, a blower for sending combustion air to the burner, a combustion tube connected to the burner, and a combustion tube connected to the combustion tube and the surface thereof. A main heat exchanger that generates heat for heating by radiation and convection, a hot water heat exchanger that has a hot water heat exchanger inside it, and a hot water heat exchanger that transfers the flow of combustion gas to the main heat exchanger or the hot water heat exchanger. In the stove, the air passage from the blower to the burner is branched into a primary air passage and a secondary air passage, and the secondary air passage is provided with secondary air for adjusting the air amount. A damper is provided, and the secondary air damper is moved in conjunction with the switching damper.

Effect of the present invention With the above-described configuration, the secondary air damper adjusts the amount of air in conjunction with the switching damper that switches the flow of combustion gas to the main heat exchanger or the hot water heat exchanger. The amount of secondary air can be changed even when heating is not performed.

Therefore, when operating floor heating where moisture in the combustion gas in the hot water heat exchanger is likely to condense, prevent condensation by increasing the amount of secondary air (high air ratio), and when not using floor heating. teeth,
The amount of secondary air is reduced compared to during floor heating operation, and the heat exchange efficiency in the main heat exchanger is not deteriorated (a conventional main heat exchanger can be used satisfactorily). Moreover, during floor heating operation in which the air ratio is increased, only the secondary air, which has little effect on combustion, is increased, so that the exhaust gas characteristics are not deteriorated.

EXAMPLE Below, an example of the present invention is shown in FIGS. 1 and 2,
This will be explained with reference to FIG.

In FIGS. 1 to 3, 1 is a burner that burns liquid fuel, 2 is a fuel pump that sends fuel to the burner 1, and 3 is a blower that also sends combustion air to the burner 1. The air passage from the blower 3 to the burner l is branched into a primary air passage 4 and a secondary air passage 5, and the secondary air passage 5 is provided with a secondary air damper 6 for controlling the amount of air flowing. . A combustion cylinder 8 having an incandescent body 7 inside is connected to the upper part of the burner 1, and a main heat exchanger 9 is connected to the upper part of the combustion cylinder 8.

10 is a heat-resistant glass attached to the front of the combustion tube 8;
Opening 1 on the front of the main unit directs the light and heat of the incandescent body 7 to the front of the stove.
It is configured to radiate through 1. Further, a hot water heat exchanger 13 containing a hot water pipe (heat exchanger) 12 is provided at the rear of the combustion tube 8, and its inlet side is connected to a branch port 14 provided on the back side of the combustion tube 8. It is. An exhaust switching chamber 16 is provided at the outlet section 15 of the hot water heat exchanger 13, and this exhaust switching chamber 16 is connected to the exhaust section 17 of the main heat exchanger 9. Further, the exhaust switching chamber] 6 is provided with a switching damper 18 therein, and is configured to select either the main heat exchanger 9 or the hot water heat exchanger 13 as the path for the combustion gas. The switching damper 18 is connected to a link rod 19 outside the exhaust switching chamber 16, and the link rod 19 is connected to the secondary air damper 6 outside the secondary air passage 5. When the damper 18 is in the position where it closes the main heat exchanger 9 side, the secondary air damper 6 is in the open position, and when the switching damper 18 is in the position where it closes the hot water heat exchanger 13 side, the secondary air damper 6 is in the open position. 6 is in the closed position. The exhaust switching chamber 16 is an exhaust pipe 20
The exhaust gas is discharged outdoors through the air supply and exhaust pipe 21. Moreover, the hot water pipe 12 has one end connected to the hot water return port 22 and the other end connected to the sub tank 2.
3, hot water is sent from the sub-tank 23 by the circulation pump 24 from the hot water outlet 25 to a radiator such as an external floor heating panel (not shown), and then again to the hot water return port 22.
It's starting to go back to.

To explain the operation in the above configuration, first, when the floor heating and the radiant heating of the stove are operated simultaneously, the burner 1 receives the liquid fuel sent from the fuel pump 2 and the liquid fuel sent from the blower 3 through the primary air passage 4. Next, combustion starts with air, and then air is blown! The secondary air sent from 3 through the secondary air passage 5 causes complete combustion and produces combustion gas. The combustion gas first heats the incandescent body 7 at the top of the burner 1, making it red-hot. At this time, the incandescent body 7 transfers its heat and light to the combustion tube 8.
The light radiates from the heat-resistant glass 10 attached to the front surface of the main body through the opening 11 on the front surface of the main body.

On the other hand, for floor heating, the circulation pump 24 has started operating, and the switching damper 18 has also been switched to the floor heating side (the state indicated by the solid line in the figure). Therefore, the combustion gas that has passed through the incandescent body 7 does not flow to the main heat exchanger 9 at the upper part of the combustion tube 8, but from the branch port 14 at the back of the combustion tube 8 to the hot water heat exchanger 1.
Flows to 3. The combustion gas that has entered the hot water heat exchanger 13 heats the hot water pipe 12 therein, but water for floor heating (hot water) is flowing through the hot water pipe 12 by a circulation pump 24. The water is heated and becomes hot water, which exits from the sub-tank 23 and the circulation pump 24 through the hot water outlet 25 and returns to the hot water return port 22 for circulation. The combustion gas that has passed through the hot water heat exchanger 13 then passes through the outlet section 15.
The gas flows from the exhaust gas into the exhaust switching chamber 16, passes through the exhaust pipe 20, passes through the supply/exhaust tube 21, and is discharged outside as exhaust gas.

During this floor heating operation, the switching damper 18 switches the combustion gas to the main heat exchanger 9 or the hot water heat exchanger 13 to control the hot water temperature, but the secondary air damper 6 is also moved by the link rod 19 at the same time. When the combustion gas flows to the hot water heat exchanger 13 and heats the hot water pipe 12, the amount of secondary air is large, and when the combustion gas flows to the main heat exchanger 9 and does not heat the hot water pipe 12, the amount of secondary air is large. It is becoming less and less. As a result, when heating the hot water pipe 12, the air ratio becomes high (excess air is large), and the hot water pipe 1
Moisture in the combustion gas does not condense on the surface of the exhaust gas, and since only the secondary air is increased, the exhaust gas characteristics are not deteriorated. Furthermore, when the combustion gas flows to the main heat exchanger 9, the air ratio is low, and the heat exchange efficiency in the main heat exchanger 9 is high (heat exchange is sufficient with a conventional main heat exchanger).

In addition, in the case of this embodiment, it is possible to simply operate the stove without floor heating, but in that case, the circulation pump 24 is not operated and the switching damper 18 is placed at the position indicated by the broken line in FIG.
The secondary air damper 6 is also shown as a broken line, and there is little secondary air (the air ratio is low), and the combustion gas does not flow to the hot water heat exchanger 13 but to the main heat exchanger 9, and the main heat exchanger 9 is sufficient. The heat is radiated, enters the exhaust switching chamber 16 from the exhaust section 17 of the main heat exchanger 9, and is exhausted through the exhaust pipe 20.

As described above, according to the embodiment of the present invention, the hot water heat exchanger 1
When the combustion gas flows through the hot water pipe (heat exchanger) 12 and heats the hot water pipe (heat exchanger) 12, the air ratio becomes high and the moisture in the combustion gas does not condense on the surface of the hot water pipe (heat exchanger) 12. No need to treat condensed water. Also, when the combustion gas flows through the main heat exchanger 9, the air ratio becomes low and the main heat exchanger 9
Heat exchange efficiency is high (heat exchange is sufficient with a conventional main heat exchanger).

The above embodiments have been explained using a heat exchanger for floor heating using hot water, but this is not limited to floor heating, and other radiators may be used. Also, the switching damper may be used on the outlet side of the hot water heat exchanger. Although the explanation has been given on the case where it is provided on the inlet side, the same applies to the case where it is provided on the inlet side, and the fuel may be gaseous fuel instead of liquid fuel. Further, although the switching damper and the secondary air damper are connected by a link rod, it is clear that the same effect can be obtained even if driving means are provided for each individually and moved simultaneously.

Effects of the Invention As is clear from the above embodiments, according to the present invention, by interlocking the switching damper and the secondary air damper, moisture in the combustion gas tends to condense on the surface of the hot water heat exchanger when heating hot water. The air ratio can be set high when hot water is not being heated, and the air ratio can be set low when hot water is not being heated. Therefore, it is possible to eliminate the problem of moisture condensation within the hot water heat exchanger without deteriorating the combustion exhaust gas characteristics, eliminating the need for measures to treat condensed water and prevent condensation, and eliminating the need for conventional main The heat exchanger performs sufficient heat exchange, and no special means for improving heat exchange is required.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the internal structure of a stove with a built-in hot water heat exchanger according to an embodiment of the present invention, FIG. FIG. 4 is a sectional view showing the internal structure of a conventional stove with a built-in hot water heat exchanger. 1...Burner, 3...Blower, 4...
...Primary air passage, 5...Secondary air passage,
6... Secondary air damper, 8... Combustion cylinder, 9... Main heat exchanger, 12... Hot water pipe (heat exchanger), 13. Old...Hot water heat exchanger, 18
・・・・・・Switching damper. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 3

Claims (1)

[Claims] a burner, a blower that sends combustion air to the burner, a combustion tube connected to the burner, a main heat exchanger that communicates with the combustion tube and emits heating heat from its surface by radiation and convection, and hot water. In a stove comprising a hot water heat exchanger having a heat exchanger therein, and a switching damper that switches the flow of combustion gas to the main heat exchanger or the hot water heat exchanger, the air flowing from the blower to the burner Passage 1
A hot water heat exchanger that branches into a secondary air passage and a secondary air passage, a secondary air damper for adjusting the amount of air is provided in the secondary air passage, and the secondary air damper is operated in conjunction with the switching damper. Built-in stove.