JPS59195052A - Hot-water boiler - Google Patents

Abstract

PURPOSE:To prevent overshooting due to after-heating by a method wherein a branch pipe leading to a hot water and a first heat exchanger is connected to one end of a mixing tank and an outlet pipe extending from a second heat exchanger is connected to the other and of the mixing tank. CONSTITUTION:Water is supplied into the boiler 1 through a feed water pipe 12 at the lower part of the boiler and then it is made to exchange heat with a combustion exhaust gas to become hot as it moves upward in the boiler 1. After that, a part of the hot water is introduced into a pipe type heat exchanger 4 for further heating and reaches the mixing tank 8 from the outlet pipe 11. The remaining hot water reaches the mixing tank 8 through the branch pipe 10 led from the boiler 1 and is mixed with high temperature hot water to be served. As the hot water pipe 9 is provided at the other end of the outlet pipe 11, the variation of temperature of the hot water in the outlet pipe 11 due to the combustion and non-combustion of the burner is minimized by the passage of the hot water through the mixing tank 8.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a hot water boiler used for hot water supply.
The structure of the C conventional example which attempts to prevent over-sheeting due to shrinkage and after-boiling during fluctuations in the hot water supply temperature and its problems. Since the hot water outlet is provided in the hot water outlet tank at the opposite position, hot water heated to a high temperature by post-boiling in the heat absorption pipe is supplied without mixing with the relatively low temperature water in the hot water outlet side tank. There was a problem in that hot water was supplied as is.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to prevent overshoot due to after-boiling and at the same time reduce the period of hot water supply temperature fluctuation. In the present invention, a mixing tank having a first heat exchanger, a second heat exchanger connected to the first heat exchanger, and a hot water outlet pipe is provided, and a branch pipe is provided from the first heat exchanger to the mixing tank. At the same time, it is characterized by having a configuration in which a hot water outlet pipe and a branch pipe are connected to one end of the mixing tank, and an outlet pipe from the second heat exchanger is connected to the other end, thereby preventing overheating due to after-boiling. This solves the problems of the occurrence of shoots and the increase in hot water supply temperature during fluctuations.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 1 denotes a first heat exchanger consisting of a can having a flue 2 41 therein, and 3 a flue. The second heat exchanger consists of a coil-shaped pipe heat exchanger connected to the first heat exchanger 1, which is attached to the upper part of the first heat exchanger 1 consisting of a bar and a 4-bar can body. It is a vessel. Reference numeral 5 denotes a bottomed rectifying cylinder for regulating the flow of exhaust gas provided inside the pipe heat exchanger 4, and a passage hole 7 for exhaust gas outflow is provided between the exhaust cover 6 and the exhaust cover 6. Provided on the outlet side of the second heat exchanger 4 consisting of an 8-pipe heat exchanger/
This is a mixing tank having an outlet pipe 9, and 10 is a branch pipe disposed between the first heat exchanger 1 made of a can and the mixing tank 8. The tapping pipe 9 and the branch pipe 10 are connected to one end of the mixing tank 9, and the outlet pipe 11 of the pipe heat exchanger 4, which is a second heat exchanger, is connected to the other end. 12 is a water supply pipe provided at the bottom of the first heat exchanger 1, and 13 is a blower for the burner 3.

The operation of the above configuration will be explained below.

When the burner 3 installed at the bottom of the flue 2 of the first heat exchanger 1 made of a can is operated, the generated high-temperature combustion exhaust gas flows through the flue 2.
After passing through the upper row, it is regulated to the outer periphery of the flue by the rectifier tube 5, and after coming into contact with the pipe heat exchanger 4, it is discharged to the outside of the machine through the passage hole 7.

On the other hand, the flow on the water side is supplied from the water supply pipe 12 at the bottom of the can body 1, and then heat exchanged with the combustion control gas while moving up the can body 1. Thereafter, a portion of the hot water is guided to the pipe heat exchanger 4 where it is further heated, and then reaches the mixing tank 8 through the outlet pipe 11. The remaining hot water passes through a branch pipe 10 led out from the can body 1 to the mixing tank 8, mixes with the high temperature water that has passed through the pipe heat exchanger 4, and is discharged. Since the hot water temperature fluctuation in the outlet pipe 11 due to the start and stop of the burner is reduced by passing through the mixing tank 8, the hot water supply temperature fluctuation 1] can be reduced.

High-temperature water that boils locally in the pipe heat exchanger 4 due to after-boiling after the burner is extinguished is transferred to the pipe heat exchanger 4 → outlet pipe 11 → mixing tank 8 → branch pipe 10 → can body 1 → pipe heat exchanger A natural circulation occurs in the circuit of the vessel 4, and the water is mixed with canned water in a relatively large capacity and low temperature mixing tank 8, or an outlet pipe 11 and a branch pipe 10 are connected to both ends of the mixing tank. Therefore, during natural circulation, the entire amount of low-temperature canned water in the mixing tank 8 is mixed with the canned water in the pipe-type heat exchanger 4 that has been heated to a high temperature after boiling, thereby reducing overshoot.

Effect of the invention (1) Fluctuations in hot water supply temperature can be reduced.

That is, the overshoot due to after-boiling can be reduced by passing through the mixing tank, which can reduce the temperature fluctuations in the second heat exchanger outlet pipe.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hot water boiler which is an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line -A' to FIG. 1. 1...First heat exchanger, 2...Flute, 4...
...Second heat exchanger, 8...Mixing tank, 9
・・・・・・Output pipe, 1°・・・・・・Branch pipe, 11・
...Exit pipe. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A mixing tank having a first heat exchanger, a second heat exchanger connected to the first heat exchanger, and a hot water outlet pipe is provided, and a branch pipe leading from the first heat exchanger to the mixing tank is provided, and the mixing tank A hot water boiler having a configuration in which a hot water tap pipe and a branch pipe are connected to one end of the boiler, and an outlet pipe from the second heat exchanger is connected to the other end.