JPS634098B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to improve the exhaust heat recovery performance and make the equipment more compact in a two-can, two-water hot water heater that recovers exhaust gas heat after passing through a main heat exchanger. It is something.

First, a conventional example will be explained with reference to FIG. The left half of the figure shows the heating function part, and the right half shows the hot water supply function part.

On the heating side, 1 is a gas burner, 2 is a heat exchanger, 3
indicates an exhaust pipe, and the heating water heated by the heat exchanger 2 is supplied from the heating outlet pipe 4 to the room to be heated. The cooled heating water used for heating returns to the heating inlet pipe 5, passes through a tank 6, is pressurized by a pump 7, and is reheated by the heat exchanger 2.

On the other hand, on the hot water supply side, the gas combusted by the gas burner 8 is transferred to the main heat exchanger 9, the exhaust stack 10, and the auxiliary heat exchanger 1.
1, passes through a horizontal exhaust pipe 12, is connected to the hot water supply side exhaust pipe 3 at a collective exhaust pipe 13, and is discharged to the outside of the machine by a forced exhaust fan 14. on the other hand,
The flow of water is through a water supply pipe 15 directly connected to a water pipe etc.
Water passing through the hot water supply flow switch 16 is preheated by the auxiliary heat exchanger 11, heated by the main heat exchanger 9, and flows out of the machine from the hot water supply pipe 17.

By the way, since cold water is supplied to the auxiliary heat exchanger 11, components in the exhaust gas are condensed, water is generated, and the water falls as drain. Therefore, a drain receiver 18 is provided, and the drain is discharged through a drain discharge pipe 19. Note that 20 is a gas introduction pipe.

The problems here are: (i) Since the flow direction of the exhaust gas and the falling direction of the condensate are opposite to each other, drain water in the auxiliary heat exchanger 11 is difficult to drain, resulting in poor heat exchange performance.

(ii) Since the drain receiver 18 is located in the exhaust gas passage in the exhaust pipe 10, the drain water is discharged with heat, which wastes a lot of heat.

(iii) Requires a large space for the heat exchange section. That is, since the main heat exchanger 9, the drain receiver 18, and the auxiliary heat exchanger 11 are configured in the vertical direction, a large space is required in the height direction. 9 more,
If a sufficient distance is not provided between the exhaust gases 18 and 11, the exhaust gas tends to drift and the heat exchange efficiency deteriorates.

The present invention is proposed to solve this problem.

Hereinafter, an embodiment of the present invention will be described based on FIG. 2.

First, in the present invention, heat exchange performance is improved by providing the auxiliary heat exchanger 11 in the horizontal exhaust pipe 12 and locating the drain receiver 18 below it. That is, by allowing the exhaust gas to flow in the lateral direction and the drain water (condensed water) to flow in the direction of gravity (downward flow), draining performance at the fin portion of the auxiliary heat exchanger 11 is improved. Therefore, the drain water is less likely to be reheated by exhaust gas, and the heat exchange performance is improved.

Furthermore, since the structure can be configured so that the exhaust gas does not hit the lower part of the drain water receiver 18, it is possible to prevent the drain water from being reheated by the exhaust gas in the drain water receiver, thereby reducing heat loss. It also makes drainage easier.

Furthermore, it is possible to make the device more compact. In other words, the vertical exhaust stack 10 can be made smaller, and the lateral exhaust stack 12 can be provided with an auxiliary heat exchanger without having to be enlarged. Furthermore, by providing the drain receptacle 18 between the supply and heating heat exchangers, which has conventionally been a wasted space, the equipment can be made more compact.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional hot water supply and heater, and FIG. 2 is a block diagram of a hot water supply and heater according to an embodiment of the present invention. 11...Auxiliary heat exchanger, 12...Exhaust stack, 18
...Drain receiver.

Claims (1)

[Claims] 1. An auxiliary heat exchanger that has 2 cans and 2 water channels, each exhaust pipe is assembled to form one exhaust part, and furthermore, a part of the exhaust pipe up to the exhaust collection part is provided with an auxiliary heat exchanger that initially heats cold water. In a hot water heater equipped with a hot water heater, a part of the exhaust stack up to the exhaust collecting part is configured so that exhaust gas flows in a horizontal direction, and the auxiliary heat exchanger is provided in that part, and the auxiliary heat exchanger is provided in that part. A hot water heater equipped with a condensed water receiver at the bottom that receives condensed water generated in the container and discharges it to a desired location.