JPS5878026A - Water heater with both hot water feeding and circulating apparatus - Google Patents

Abstract

PURPOSE:To enable simplifying of a constitution and improving of a thermal efficiency, by a method wherein, in a titled device having a hot water feeding circuit and a hot water circulating circuit, a heat absorbing pipe of each of said circuits is installed in a common combustion chamber, and a heat exchanger, performing a heat exchange between the two circuit, is mounted. CONSTITUTION:In case each of a hot water feed circuit 2 and a hot water circulating circuit 3 for heating is used, opening and closing valve 16 and 26 are first closed to operate circulating pumps 17 and 27. Then, water or hot water in the two circuits 2 and 3 performs a heat exchange at a heat exchanger 9, and simultaneously, it is heated at heat absorbing pipes 7 and 8 housed in a combustion chamber 6 and is fed to a hot water feed faucet 14 and a radiator 22. In case only the hot water feeding circuit is used and the hot water circulating circuit 3 is not used, the opening and closing valve 26 is opened, the opening and closing valve 16 and an opening and closing valve built into the radiator 22 are closed, and each of the pumps 17 and 27 is operated. This transfers the heat of the hot the pumps 17 and 27 is operated. This transfers the heat of the hot water circulating circuit 3 side to the hot water feeding circuit 2 side through the heat exchanger 9, and prevents hot water in the circuit 3 from rising to an abnormal high temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water supply/circulation water heater that is equipped with a hot water supply circuit and a hot water circulation circuit, and is capable of supplying hot water and circulating hot water for use in hot water heating or bathing, either independently or simultaneously.

Conventional hot water circulation and hot water heating systems include two separate systems of burners, combustion chambers, and heat absorption pipes for the hot water supply circuit and the hot water circulation circuit, each of which heats the water independently. Since there are multiple combustion systems, it becomes expensive and the device becomes large. Therefore, it is possible to install two heat absorption pipes for both hot water supply and hot water circulation circuits in parallel in a common combustion chamber, but in this case, when only hot water supply or hot water circulation is performed, the heat absorption pipes of the circuits that are not used Also, the water inside may become overheated, which is dangerous and shortens the life of the equipment.

In order to eliminate this inconvenience, it is also possible to use a double-tube structure of heat absorption tubes in which one heat absorption tube of both circuits is inserted into the other heat absorption tube.

The inner heat absorption tube is indirectly heated through a layer of water with high thermal resistance, resulting in inferior heating characteristics.Furthermore, the water near the heat absorption tube in the circuit that is not used is also heated at the same time, resulting in poor thermal efficiency and uneconomical results. .

The present invention solves the above-mentioned drawbacks and aims to provide a hot water circulation/heating device that has only one combustion system, can be manufactured at low cost, has no risk of overheating, and has good thermal efficiency.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

In the figure, l is a hot water circulation/heating device, 2 is a hot water supply circuit, and 3 is a hot water supply circuit.
is the hot water circulation circuit. 4 is a gas burner, and 5 is a casing that accommodates this gas burner and has a combustion chamber 6 formed therein. 7 is a heat absorption pipe of the hot water supply circuit, 8 is a heat absorption pipe of the hot water circulation circuit, and both prefecture heat pipes are installed in parallel in the common combustion chamber 6. 9
is a heat exchanger installed in the hot water supply circuit 2 and the hot water circulation circuit 3, which consists of a diaphragm type heat exchanger, and one end of the two built-in flow paths is connected to the heat absorption pipes 7 and 8. This is for heat exchange between .3 and 3. To hot water circuit 2>z
7 and 11 are inlet pipes connected to the heat absorption pipe 7, and their inlets are connected to a cold water supply source such as a water pipe. Reference numeral 12 denotes a delivery outlet connected to the heat exchanger 9, and its outlet is connected to a hot water tap 14 via a hot water pipe 13. Reference numeral 15 indicates a communication pipe that connects the inlet pipe 11 and the delivery service 12, 16 indicates an on-off valve provided within the communication pipe, and 17 indicates a circulation pump provided within the delivery service 12. This circulation pump has both the functions of supplying hot water and internally circulating hot water in the hot water supply circuit 2 to the heat absorption pipe 7 via the connecting pipe 15'e when the hot water supply circuit 2 is not in use. Note that this circulation pump 17 may be provided within the communication pipe 15 and used only for internal circulation.

18 is a solar heat absorber used as necessary;
1 and the water pipe. On the other hand, in the hot water circulation circuit 3, 20 is an inlet pipe connected to the heat exchanger 9, and its inlet is connected to a radiator 22 via a recovery pipe 21.

23 is a delivery pipe connected to the heat absorption pipe 8, and its outlet is connected to the hot water pipe 2.
It is connected to the heat radiator 22 via 4. 25 is immigration 20
26 is an on-off valve provided in this communication pipe, and 27 is a circulation pump provided in the delivery 23. This circulation pump is used to circulate hot water to the radiator 22, and to circulate hot water in the hot water circulation circuit 3 to the connecting pipe 2 when the radiator is not in use.
5 and has the dual function of internal circulation to the heat absorption tube 8.

Next, the operation of the apparatus having the above configuration will be explained.

Figure 2 uses only hot water supply circuit 2 and hot water circulation circuit 3 (
This shows a case where the pipe is not used (for heating purposes), and the inside of the pipe indicated by a thick line is in a state of flow (the same applies to other figures below). That is, the on-off valve 26 is opened, the on-off valve 16 and the on-off valve built in the radiator 22 are closed, and each circulation pump 17.27 is operated. The high temperature combustion gas produced by the combustion in burner 4 directly heats both heat absorber tubes 7 and 8. The water in the hot water circulation circuit 3 is connected to the connecting pipe 25.
As shown by the arrow, the hot water circulates internally to reach a high temperature, and as it flows through the heat exchanger 9, it further heats the hot water in the hot water supply circuit 2 that has flowed out of the heat absorption pipe 7. As a result, the temperature of hot water for hot water supply rises, and overheating of the heat absorption pipe 8 and the water within the pipe is prevented.

According to the inventor's experiments, the amount of combustion heat of burner 4 was 12.00
When the hot water supply flow rate was 0 kcal/hour and the hot water supply flow rate was 6 L/min, the temperature of the outflowing hot water in the delivery 12 was 49°C in the case of the apparatus shown in the second figure equipped with the heat exchanger 9; When it was removed, the temperature of the water dropped to 45°C.

Next, FIG. 3 shows a case where only the hot water circulation circuit 3 is used for heating, and the hot water supply circuit 2 is not used (for hot water supply). That is, the hot water tap 14 and the on-off valve 26 are closed, and the on-off valve 1 is closed.
6 and the on-off valves built into the radiator 22 are opened to operate each circulation pump 17 and 27. In this case, the water in the hot water supply circuit 2 circulates internally through the connecting pipe 15 as shown by the arrow, becomes high temperature due to heating in the heat absorption pipe 7, and is heated to a high temperature by the heat exchanger 9.
When flowing through the hot water circulation circuit 3, the hot water collected from the radiator 22 is heated, and this heated hot water is further heated in the heat absorption pipe 8, so that it reaches a high temperature suitable for heating. It is supplied to the heat radiator 22. Also in this case, as in the case of FIG. 2, heat exchange in the heat exchanger 9 prevents overheating of the heat absorption tube 7 and the water within the tube.

Further, FIG. 4 shows a case where hot water supply and heating are performed simultaneously using the hot water supply circuit 2 and the hot water circulation circuit 3, respectively. That is, the on-off valves 16 and 26 are closed to cut off the flow in the communication pipes 15 and 25, and the circulation pores 7 and 17 are closed. Driving 7. Yo.

Water or hot water flows in each circuit 2.3, and each circuit 2.
．． Heat is exchanged in the heat exchanger 9 according to the temperature of the water in the tank 3. Since each heat absorption pipe 7.8 is directly heated by the combustion gas of the parse 4, the temperature of the hot water rises quickly at the start of heating, and good heating characteristics can be obtained.

The present invention is not limited to the above embodiments, and for example, depending on the capacity of the heat absorption tubes 7 and 8, the heat exchanger 9 may be connected to the inlet side of the heat absorption tubes 7 or the outlet side of the heat absorption tubes 8. Often, a part or all of the heat exchanger 9 is connected to the combustion chamber 6.
It may be installed inside.

Further, the hot water circulation circuit 3 may be used for circulating hot water in a bathtub or for indirect heating using a radiator.

As explained above, according to the present invention, the heat absorption pipes of the hot water supply circuit and the hot water circulation circuit are arranged in a common combustion chamber.
Only one combustion system is required, and the cost of the device can be reduced. In addition, a heat exchanger was installed to exchange heat between the hot water supply circuit and the hot water circulation circuit, and a circulating flow was formed inside the unused circuit through the connecting pipe. In addition to eliminating water overheating accidents, the thermal energy given to the binocular heat tubes is effectively used, resulting in high thermal efficiency.

[Brief explanation of the drawing]

FIG. 1 is an equipment system diagram of a hot water circulation/heating device showing an embodiment of the present invention, and FIGS. 2 to 4 are explanatory views of the operation of the device shown in FIG. 1. l゛...Water heating device for water supply circulation, 2...Hot water supply circuit,
3... Hot water circulation circuit, 6... Combustion chamber, 7... Heat absorption pipe, 8... Heat absorption pipe, 9... Heat exchanger, 11... Inlet pipe, 12... Outlet pipe, 15... Communication pipe, 16... Open/close valve, 17... Circulation pump, 20... Inlet pipe, 23...
...Outlet pipe, 25...Connection pipe, 26...Opening/closing valve, 27
...Circulation pump. Fang 1 Fig. O 2 Fig. 3 Fig. Fang 4 Fig.

Claims (1)

[Claims] In a hot water supply/circulation water heater equipped with a hot water supply circuit and a hot water circulation circuit, each of the heat absorption pipes of the above two circuits is arranged in a common combustion chamber, and the heat exchange between the above two circuits is carried out within the above two circuits. An exchanger is provided, and in each of the above circuits, the small pipe and the inlet pipe are connected by a communication pipe, and when only one of the above two circuits is used, an internal circulation flow is formed in the other circuit via the communication pipe. A water heating device for both hot water supply and circulation, characterized by being equipped with a switching valve and a circulation pump.