JPH04161727A - Heater with built-in hot water heat exchanger - Google Patents

Abstract

PURPOSE:To prevent combustion gas from flowing to a hot water heat exchanger when the pressure in said hot water heat exchanger turns higher than that in a main heat exchanger by installing an air bypass passage which directly leads to the hot water heat exchanger from a fan without passing through a burner. CONSTITUTION:An exhaust air switching chamber 16 is provided with a switching damper 18 and arranged so as to select either a main heat exchanger 9 or a hot water heat exchanger for a combustion gas passage. A fan 3 is also provided with a bypass passage 19 installed so as to supply air directly to the hot water heat exchanger 13 in addition to an air passage 4. During floor heating operation, the switching damper 18 changes over the supply of combustion gas to either the main heat exchanger 9 or the hot water heat exchanger 13, thereby controlling hot water temperature. Furthermore, air is supplied from the fan 3 into the hot water heat exchanger 13 by way of the bypass passage 19, which forces the pressure in the hot water heat exchanger 13 to exceed the pressure in the main heat exchanger 9 when the switching damper 8 shuts down the hot water heat exchanger 13, thereby preventing the combustion gas from flowing into the hot water heat exchanger 13.

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, in particular, have built-in hot water heat exchangers for simple hot water floor heating in order to improve indoor temperature distribution. Devices that allow the user to choose between operating the stove or only using the stove have been developed and are now in 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 3 having a hot water pipe 36 inside from the middle of the main heat exchanger 33
7 is branched, and a damper 38 for switching the flow of combustion gas is provided at the branched portion, 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 connected to the main heat exchanger 33 and passes through an exhaust section 39 . Further, this 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 36, and warms the water flowing therein. The heated water is sent to the floor heating panel by the circulation pump 4I 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. You can also do just that. When the stove is operating 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 damper 38 is provided in the combustion gas passage, that is, in the high temperature section, and is therefore usually made of metal. Therefore, even if the damper 38 rotates toward the main heat exchanger 33 and closes the hot water heat exchanger 37 side, it cannot completely close it. In addition, since the pressure inside the hot water heat exchanger 37 is lower than that of the main heat exchanger 33, the damper 38
Even when the side is closed, combustion gas flows into the hot water heat exchanger 37 little by little. Therefore, when the damper 38 closes the hot water heat exchanger 37 side in order to control the hot water temperature during floor heating operation, moisture in the combustion gas flowing in little by little condenses in the lower temperature part of the hot water pipe 36. Therefore, a means to treat the condensed water was needed.

Also, when operating the stove alone without floor heating,
Since the circulation pump 41 is not operating and the inside of the hot water pipe 36 is empty, the hot water pipe 36 is gradually heated by the combustion gas that gradually flows in, resulting in a high temperature. Therefore, when the circulation pump 41 is operated, the hot water pipe 36 must be cooled before the next floor heating operation is performed, which causes the problem that boiling occurs in the hot water pipe 36.

The present invention solves the above-mentioned problems by preventing dew condensation in the hot water heat exchanger of the combustion gas that gradually flows into the hot water heat exchanger during floor heating operation, and allows the stove to be operated alone without underfloor heating operation. The purpose is to eliminate the risk of boiling even if the circulation pump is operated immediately when the next floor heating operation is performed without heating the hot water pipes.

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 from a hot water heat exchanger, a hot water heat exchanger that has a hot water heat exchanger therein, and a switch that switches the flow of combustion gas to the main heat exchanger or the hot water heat exchanger. In the stove comprising a damper, a bypass passage is provided for air to flow directly from the blower to the hot water heat exchanger without passing through the burner.

Effects With the above-described configuration, the present invention allows air to be sent directly from the blower to the hot water heat exchanger through the bypass passage when the damper closes the hot water heat exchanger side, so that the hot water heat exchanger is more efficient than the main heat exchanger. The pressure will be higher in the tank and the combustion gas will no longer flow to the hot water heat exchanger. Therefore, during floor heating operation when the damper closes the hot water heat exchanger side, moisture in the combustion gas does not condense in the hot water heat exchanger.

Further, even when the stove is operated alone, the hot water pipe is not heated, and there is no risk of boiling even if the circulation pump is operated immediately when the next floor heating operation is performed.

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. An air passage 4 leading from the blower 3 to the burner l is branched into a primary air passage 5 and a secondary air passage 6. 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. A heat-resistant glass 10 is attached to the front surface of the combustion tube 8, and is configured to radiate the light and heat from the incandescent body 7 toward the front of the stove through an opening 11 on the front surface of the main body. In addition, at the rear of the combustion tube 8, there is a hot water heat exchanger 13 in which a hot water pipe (heat exchanger) 12 is housed.
is provided, and its inlet side is connected to a branch port 14 provided on the back side of the combustion cylinder 8. Outlet section 15 of hot water heat exchanger 13
An exhaust switching chamber 16 is provided in the exhaust switching chamber 1.
6 is connected to the exhaust section 17 of the main heat exchanger 9.

Further, the exhaust switching chamber 16 has a switching damper 1 inside thereof.
8 is provided, and the combustion gas passage is configured to select either the main heat exchanger 9 or the hot water heat exchanger 13.

Further, a bypass passage 19 is provided separate from the air passage 4 from the blower 3 to directly send air to the hot water heat exchanger 13. The exhaust switching chamber 16 is connected to an exhaust pipe 20, and exhaust gas is discharged outside through the supply and exhaust pipe 21. Moreover, the hot water pipe 12
One end is connected to the hot water return port 22 and the other end is connected to the sub tank 23, and the hot water is supplied from the sub tank 23 to the circulation pump 2.
4, the hot water is sent from the hot water outlet 25 to an external radiator such as a floor heating panel (not shown), and then returned to the hot water return port 22 again.

The operation of the above configuration will be explained.

First, when operating floor heating and stove radiant heating at the same time,
The burner 1 starts combustion using liquid fuel sent from a fuel pump 2 and primary air sent from a blower 3 through an air passage 4 and through a primary air passage 5.
The secondary air sent through the secondary air passage 6 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 radiates its heat and light from the heat-resistant glass IO attached to the combustion tube 8 to the front side through the opening 11 on the front side of the main body.

On the other hand, the circulation pump 24 has started operating for floor heating, and the switching damper 18 is also on the floor heating side (solid line B in the figure).
t). Therefore, the combustion gas that has passed through the incandescent body 7 does not flow to the main heat exchanger 9 in the upper part of the combustion tube 8, but flows from the branch port 14 on the back side of the combustion tube 8 to the hot water heat exchanger 13. The combustion gas that has entered the hot water heat exchanger 13 heats the hot water pipe 12 therein, but inside the hot water pipe 12, water for floor heating (hot water) is circulated through the circulation pump 24.
This water is heated and becomes hot water, which is then sent to the sub-tank 23. The hot water exits from 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 1
5 to the exhaust switching chamber 16, passes through the exhaust pipe 20 and the supply/exhaust pipe 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 exchanger 13,
Control hot water temperature. Also, since air (bypass air) is sent into the hot water heat exchanger 13 from the blower 3 through the bypass passage 19, the switching damper 18
When the hot water heat exchanger 13 side is closed, the pressure of the hot water heat exchanger 13 is higher than that of the main heat exchanger 9, and combustion gas does not flow into the hot water heat exchanger 13. Even if water flows through the hot water pipe 12, moisture does not condense on the surface of the hot water pipe 12.

In addition, in the case of this embodiment, it is possible to simply operate the stove without underfloor heating, but in that case, the circulation pump 24 is not operated and the switching damper 18 closes the hot water heat exchanger 13 side to exchange the main heat. Combustion gas starts to flow into the hot water heat exchanger 9, but as in the case described above, due to the effect of the bypass air sent to the hot water heat exchanger 13, the combustion gas does not flow into the hot water heat exchanger 13, and the hot water with no flowing water The pipe 12 is not heated.

As a result, even if the circulation pump is operated immediately when switching from the stove-only operation to the floor heating operation, the circulating water will not boil.

In addition, although the above embodiment was explained using a heat exchanger for floor heating using hot water, it is not limited to floor heating and other radiators may be used.Also, the switching damper may be placed on the outlet side of the hot water heat exchanger. Although the explanation has been given on a device provided with the device, the same applies to the population side, and the fuel may be gaseous fuel instead of liquid fuel.

Effects of the Invention As is clear from the above embodiments, according to the present invention, when the switching damper is blocking the hot water heat exchanger side,
Since air is sent directly from the blower to the hot water heat exchanger through the bypass passage, the pressure in the hot water heat exchanger is higher than that in the main heat exchanger, and combustion gases no longer flow to the hot water heat exchanger. Therefore, when the damper closes the hot water heat exchanger side to control the hot water temperature during floor heating operation, the moisture in the combustion gas will not condense in the hot water heat exchanger, so the condensed water will be removed. No processing means are required. Further, even when the stove is operated alone, the hot water pipe is not heated, and there is no risk of boiling even if the circulation pump is operated immediately when the next floor heating operation is performed.

[Brief explanation of the drawing]

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, and FIG.
-A sectional view, FIG. 3 is a BB sectional view in FIG. 1, and FIG. 4 is a sectional view showing the internal structure of a conventional stove with a built-in hot water heat exchanger. l...Burner, 3...Blower, 8...
... Combustion cylinder, 9 ... Upper heat exchanger, 12 ...
...Hot water pipe (heat exchanger), 13...
Hot water heat exchanger, 18...Switching damper, 19.
...Bypass passage. Name of agent: Patent attorney Akira Okaji and two others Figures 2 and 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 heat for heating from its surface, and a heat exchanger for 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 blower directly flows from the blower without passing through the burner. A stove with a built-in hot water heat exchanger, characterized in that an air bypass passage leading to the hot water heat exchanger is provided.