JPS5950881B2 - Energy saving boiler - Google Patents

Description

[Detailed description of the invention] This invention relates to improvements in boilers.

Conventional boilers are of the type in which heat is heated by a heat exchanger in one tank and the waste heat is released without being reused, or as shown in Figure 2, a boiler is heated by a heat exchanger in one tank, and the waste heat is released without being reused.
A combustion chamber 2 equipped with a burner rotor 3 is formed inside the combustion chamber 2, a first heat exchanger 4 is connected to the combustion chamber 2, and the exhaust gas is sent to an exhaust chamber 5.
through the second heat exchanger 6 which is outside the tank 1 and connected to the exhaust chamber 5 by an exhaust path, and is discharged to the outside from the exhaust lower.
There was one in which the water pipe 8 in the second heat exchanger 6 connected to the water supply port was connected to the inside of the tank 1 below the tank.

In the known boiler shown in Fig. 2 above, only when hot water is being discharged from the hot water outlet 9, water is preheated by passing the water from the water supply port through the water pipe 8 of the second heat exchanger for the amount of hot water released into the tank. When the tap 9 is closed, the water supply from the water supply port is cut off.

Therefore, if the outlet 9 is closed during the period from ignition (start) until the water boils, or after the ignition boils and the water temperature drops and the water is re-ignited, the second heat source is supplied from the water inlet. Since water is not supplied to the exchanger, in this case, the second heat exchanger is only unnecessarily heated by the exhaust heat of the first heat exchanger, and high-temperature exhaust gas with no heat drop is performed from the exhaust port. It will be done.

In other words, in the boiler shown in Fig. 2, the burner is ignited and the water is heated in the second heat exchanger and fed into the tank only when hot water is being discharged from the outlet. If the hot water temperature drops and the hot water is re-ignited, the effect of the second heat exchanger is extremely poor, and therefore the heat energy cannot be used sufficiently. There was an uneconomical problem in disposing of the waste without using it.

In this invention, a part of the water sent to be heated by the first heat exchanger in the first heat exchange chamber in the tank is transferred to the second heat exchange chamber.
In the heat exchanger, the exhaust heat of the first heat exchanger is used to heat and then sent in, and at the same time, the temperature of the exhaust heat is lowered to near normal temperature.
When the burner is ignited (at the start) or after the ignition heats up, the temperature of the outlet water drops and it is re-ignited, in other words, it can be performed continuously while the burner is being ignited, thereby achieving thermal efficiency close to 100% and reducing fuel consumption. The purpose is to provide an energy-saving boiler that can significantly reduce consumption.

The present invention will be described in detail with reference to the embodiments shown in the drawings.

In FIG. 1, reference numeral 11 denotes a tank, which is formed by interposing a heat insulating material 11C between outer plates 11a and 11b made of steel plates, copper plates, stainless steel plates, etc.

A combustion chamber 12 is formed within the tank 11. tank 11
A burner rod 13' of the burner 13 is provided extending through the combustion chamber 12 and toward the inside of the combustion chamber 12.

An ice chamber 16 is provided in the tank 11 below the combustion chamber 12,
A water supply port 17 is provided at the lower part of the water chamber 16 through the tank 11.
will be established.

18 is a partition plate, 19 is a water communication hole, and the partition plate 18
The inside of the tank above is designated as the first heat exchange chamber A.

A first heat exchanger 14 communicating with the combustion chamber 12 is connected to the combustion chamber 12 and leads to an exhaust chamber 15 .

Externally of the tank 11 is an exhaust chamber 15 of the first heat exchanger 14.
An exhaust path 20 is formed which connects to an exhaust pipe 22 attached to the exhaust pipe 22.

21 is the wall of the exhaust passage.

The exhaust port 20' of the exhaust path 20 is provided at the lower part of the exhaust path.

Further, a second heat exchanger 24 is formed by providing a water guide path 23 in the exhaust passage 20 that connects the lower part of the ice chamber 16 and the upper part (first heat exchange chamber) in the tank 11.

The burner 13 is provided with a thermostat (not shown) for extinguishing the burner when the temperature of the hot water in the first heat exchange chamber A reaches a predetermined temperature and igniting the burner when the temperature drops below the predetermined temperature.

25 is a return pipe opening, and 26 is an outlet.

In the above embodiment, the water chamber 16 is provided in the tank 11 via the partition plate 18, but the partition plate 18
It is not necessary to provide the water chamber 16 in the tank 11.
It may be constructed separately from the tank and a water communication port may be formed by the lower part of the tank and a pipe.

Furthermore, a pipe 31 is taken out from the water supply port 17, and a water jet nozzle 30 attached to the tip thereof is installed at the water inlet part of the lower part of the second heat exchanger 24 from the ice chamber 16. Water may also be introduced into the heat exchanger.

Next, the operation of the present invention will be described with reference to an embodiment shown in the drawings.

(a) At the time of ignition (at the time of starting)...In other words, the burner 13 is ignited and hot water is discharged from the hot water outlet 26 until the hot water in the first heat exchange chamber A reaches the predetermined temperature. In this case, the temperature of the hot water in the first heat exchange chamber A, especially in the upper part thereof, rises, and the exhaust gas from the first heat exchanger 14 reaches the exhaust chamber 1.
5, passes through the exhaust path 20 of the second heat exchanger 24, and is discharged from the exhaust port 20', the water in the water guide path 23 in the second heat exchanger 24 is heated by the exhaust heat of the exhaust gas. Ru.

Therefore, the specific gravity of the water becomes small, and the water rises up the water guide path 23 of the second heat exchanger 24 and flows into the upper part of the first heat exchange chamber A in the tank 11.

The water at a lower temperature in the lower part of the first heat exchange chamber A flows into the water chamber 16 from the communication port 19 by the amount that has flowed in, and at the same time, cold water from the water chamber 16 flows from the inlet of the second heat exchanger 24 and has a low temperature. Even in the case of exhaust gas, the exhaust heat is sufficiently absorbed by the cold water flowing in from the ice chamber 16 and then released to the outside from the exhaust port 20'.

When this is repeated and the hot water temperature in the upper and lower portions of the first heat exchange chamber reaches a predetermined temperature, the hot water level in the water chamber 16 (the interface between the hot water temperature and the water temperature) decreases.

Therefore, while the burner 13 is igniting and burning, the water flows from the water chamber 16 through the lower part of the water guide path 23 of the second heat exchanger 24 to the second
It is heated by the heat exchanger 24 and circulated to the upper part of the first heat exchange chamber A.

Therefore, the exhaust gas discharged from the exhaust port 20' has its heat removed by the water rising inside the second heat exchanger 24, and becomes the exhaust gas at a temperature lower than the temperature of the hot water in the first heat exchange chamber A, and has sufficient thermal energy. This means that you have used the .

(b) When using hot water... When the burner 13 is extinguished, if the hot water in the first heat exchange chamber A is at a predetermined temperature, when hot water is discharged from the hot water outlet 26, the water inlet 1 is opened by that amount.
Water is supplied into the water chamber 16 from 7, and the water on the upper surface of the water chamber 16 flows into the first heat exchange chamber A through the communication hole 19 of the partition plate 18. The temperature of the water drops and the burner 13 is ignited.

The rest follows the process a.

Furthermore, when hot water is discharged from the hot water outlet 20' when the burner 13 is ignited, that amount of water is supplied into the ice chamber 16 from the water supply port 17, and the hot water on the upper surface of the ice chamber 16 flows through the communication hole 19 of the partition plate 18.
At the same time, the water in the lower part of the water chamber 16 passes through the lower part of the second heat exchanger 24 and absorbs the exhaust heat, following the process a.

As described above, in the present invention, a part of the water sent to be heated by the first heat exchanger in the first heat exchange chamber in the tank absorbs exhaust heat of the first heat exchanger in the second heat exchanger. Utilizing the cold water that is not heated by the burner from the icebox, the flow of the exhaust gas and the flow of the cold water to be heated are heated by the flow of heat in the opposite direction, and at the same time, the temperature of the exhaust heat is brought to close to room temperature. The temperature can be lowered to a near perfect heat exchange effect, and the above effect occurs not only while hot water is being discharged from the tap, but also when the burner is ignited (starting), or when the hot water temperature decreases after ignition and heating. , it is possible to continue the operation when re-igniting, that is, while one burner is ignited, thereby providing an energy-saving boiler that can obtain thermal efficiency close to 100% and greatly reduce fuel consumption. be.

Furthermore, since the exhaust heat has a temperature close to room temperature, it is not dangerous and has the advantage of not causing thermal pollution.

However, the invention can also be used in other heat medium boilers or steam boilers.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the energy-saving boiler of the present invention, and FIG. 2 is a longitudinal sectional view of a known boiler. 11... Tank, 12... Combustion chamber, 13... Burner, 13' burner, 14... First heat exchanger, 1
5... Exhaust chamber, 16 Water chamber, 17... Water supply port, 18.
...Partition plate, 19...Communication hole, 20...Exhaust path, 2
0′ exhaust port, 22... exhaust pipe, 23... water guide path,
24...Second heat exchanger, A...First heat exchange chamber.

Claims (1)

[Claims] 1 A first heat exchange chamber is formed by providing a combustion chamber equipped with a burner and a first heat exchange chamber in the tank, and an ice chamber equipped with a water supply port is formed below the first heat exchange chamber. and the first heat exchange chamber, and an exhaust passage is provided extending from the top to the bottom of the tank, and the exhaust port of the first heat exchanger is communicated with the exhaust passage, and the ice chamber and the upper part of the first heat exchange chamber are connected to each other. An energy-saving boiler 0 in which a second heat exchanger is formed by forming a water guide path in the exhaust path that connects the