JPS5918263Y2 - water heater - Google Patents

Description

[Detailed explanation of the idea] In order to increase the heat exchange rate in a conventional water heater, heat is exchanged in the main heat exchanger, and then a primary heat exchanger is placed in the exhaust gas passage to convert the supplied water into primary heat. Some are designed to be preheated using an exchanger.

However, when a primary heat exchanger is provided in this manner, moisture in the exhaust gas condenses in this portion and drain is generated, which poses a problem.

In order to solve the above problem, the present invention provides an exhaust gas passage that causes the exhaust gas passing through the charcoal exchanger to flow downward.
The bottom of this exhaust gas passage is used as a drain receiver to completely eliminate the risk of condensed water generated in the primary heat exchanger falling into the main heat exchanger or the gas burner below it. The explanation is as follows.

First, the first embodiment shown in FIG. 1 will be explained.
is a cylindrical pot with open top and bottom, a gas burner 2 is located at the bottom, and an exhaust gas passage 3 is connected to the top.

The exhaust gas passage 3 is bent laterally from the upper part of the pot 1 and further bent downward, and an exhaust flue 4 having a forced exhaust fan 5 is connected to the lower side thereof.

6 is a water supply pipe leading to water supply etc., 7 is a water governor and the water supply pipe 6
communicates with an inlet of a primary heat exchanger 8 provided in the exhaust gas passage 3 so as to be located above the joint of the exhaust flue 4.

The outlet of the heat exchanger 8 communicates with the lower end of a coiled tube 9 surrounding the outer periphery of the pot 1, and the upper end of the coiled tube 9 communicates with the inlet of a main heat exchanger 10 provided at the upper part of the pot 1. The outlet 10 communicates with a hot water pipe 11 .

Further, the bottom of the exhaust gas passage 3 is used as a drain receiving part 12,
A drain discharge pipe 13 is provided in this receiving portion 12.

In addition, 14 in the figure is a gas valve controlled by the water governor 7.

In the first embodiment described above, when water supply is started from the water supply pipe 6 under the condition that the pilot burner is lit, the water governor 7
, the gas valve 14 opens, gas begins to blow out from the gas burner 2, and is ignited by the pilot burner.

The combustion exhaust gas generated from the burner 2 rises in the pot 1 and heats the water flowing in the main heat exchanger 10, and then flows downward in the exhaust gas passage 3 and heats the water in the primary heat exchanger 8. It is preheated and discharged to the outside through the exhaust flue 4.

As cold water passes through the primary heat exchanger 8 immediately after water supply, moisture in the exhaust gas condenses and falls as drain, but this drain is collected from the drain discharge pipe 13 in the drain receiver 12. be discharged.

. The second embodiment shown in FIG. 2 is basically the same as the first embodiment, so only the different parts will be explained.

In this example, an exhaust pipe 15 which is tapered in a tapered shape and has a cylindrical opening at its upper end is installed in the upper part of the pot 1, and the outside is surrounded by an exhaust cover 16, and an annular pipe is formed between the cover 16 and the exhaust pipe 15. An exhaust gas passage 17 is formed, the upper part of this passage 17 communicates with the cylindrical opening of the exhaust pipe 15, and the lower part of the passage 17 communicates with the exhaust flue 4.

In addition, (1) the coal heat exchanger 8 is spirally wound to form an annular shape, and is located in the exhaust gas passage 17, with the bottom of the passage 17 serving as an annular drain receiving part 18, and a drain discharge pipe connected to the receiving part 18. 19 will be provided.

In the second embodiment described above, the exhaust gas heat-exchanged in the main heat exchanger 10 is transferred from the upper end opening of the exhaust pipe 15 to the exhaust gas passage 17.
While flowing downward through the passage 17, it exchanges heat with the primary heat exchanger 8 and is discharged into the exhaust flue 4.

In addition, the drain generated by the primary heat exchanger 8 is transferred to the drain receiver 1.
The drain is discharged from a drain discharge pipe 19.

As is clear from the above embodiments, the present invention has a main heat exchanger 10.
The exhaust gas heat-exchanged by the exhaust gas passage 3 or 17
This downward flow causes heat exchange with the primary heat exchanger 8.

Therefore, since the drain receiving part 12 or 18 provided at the bottom of the exhaust gas passage 3 or 17 is located at a completely different position from the inside of the pot 1, the drain generated in the primary heat exchanger 8 is transferred to the main heat exchanger 10 or the burner. There is no fear that the fuel will fall onto surfaces 2 and corrode them or cause poor combustion.

Further, since the drain receiving portion 12 or 18 is located outside the pot, the drain can be easily collected and discharged to other parts.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional front views showing each embodiment of the water heater of the present invention.

Claims (1)

[Scope of utility model registration request] A primary heat exchanger that heats water before entering the main heat exchanger is arranged in the exhaust gas passage after heat exchange in the main heat exchanger, and an exhaust gas passage that heats the primary heat exchanger. The exhaust gas flows downward from above the primary heat exchanger to the exhaust flue, and the bottom of the passage receives condensed water generated in the primary heat exchanger and discharges it to the required part. A water heater equipped with a drain receiver.