JPS6039714Y2 - 2 circuit water heater - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a two-circuit water heater having a circulation circuit for heating circulating water by a circulation pump and a hot water supply circuit for heating supply water and supplying hot water.

Conventionally, in devices with this type of circulation circuit, water is injected into the circulation pump (
Therefore, in order to perform priming, conventional systems either provide a water inlet in the circulation pump or provide a device to inject water into the pump in the circulation circuit, and then pump tap water into hoses. Rui was injecting water into the circulation pump using a container.

Therefore, in the conventional system, the configuration of the circulation pump and circulation circuit is complicated, and the priming operation is also troublesome.

The present invention takes into account the problems of the conventional example and is designed to provide priming water with a simple configuration and operation.Here is a heat exchanger that reheats the bathtub using a circulation circuit and heats the circulating water. An explanation will be given based on an example of a one-can, two-circuit water heater in which the heat exchanger and the heat exchanger for heating the water supply are integrated by sharing fins.

1 is mainly a water heater, and has a one-can, two-circuit can body 5 in which a hot water supply heat exchanger 2 and a circulation heat exchanger 3 are integrated via shared fins 4, and this can body 5 is heated. It has a shared gas burner 6.

Reference numeral 7 designates a bathtub, and a circulation circuit for bathwater water is formed between the bathtub 7 and the circulation heat exchanger 3 by an outgoing pipe 9 and a return pipe 10 in which a circulation pump 8 is interposed.

In this embodiment, a self-priming pump is used as the circulation pump 8.

11 is a water supply pipe leading to the hot water supply heat exchanger 2; 12 is a hot water supply pipe that supplies hot water from the hot water supply heat exchanger 2 to a hot water tap 13 installed in a kitchen or the like; tube 1
2 and the hot water supply circuit.

14 is a water switch that detects water flow in the water supply pipe 11; 15;
is a gas valve.

Reference numeral 16 denotes a drain pipe branched from the hot water supply pipe 12 taken out from the bottom of the main body 1 and attached thereto, and a drain valve 17 is interposed in the middle of the drain pipe 16.

Reference numeral 18 denotes a drain pipe whose one end is connected to the bottom of the pump chamber 19 of the circulation pump 8 and whose other end is taken out from the bottom of the main body 1, and 20 is a drain valve interposed in this drain pipe 18.

Reference numeral 21 denotes a hose attached to the other end of the drain pipe 18 in advance, so that the hose 21 can connect both the drain pipes 16 and 18.

22 is a water intake port of the circulation pump 8, 23 is a discharge port, 24 is an impeller, and 26 is a drive coil that rotates the impeller 24 in cooperation with a coil 25 attached to the shaft portion of the impeller 24.

27 is a water supply valve provided outside the main body 1, and 28 is a bypass pipe that connects the water supply pipe 11 and the hot water supply pipe 12.

In the above configuration, in order to supply hot water, it is sufficient to open the hot water tap 13, the water switch 14 is activated, the gas valve 15 is opened, the gas burner 6 is combusted, and hot water is supplied.

To circulate and heat the bathtub water, turn on an operation switch (not shown), the circulation pump 8 will operate and the water in the bathtub 7 will be sent to the circulation heat exchanger 3, the gas valve 15 will open and the gas burner 6 will be heated.
is combusted and cyclical heating is performed.

By the way, when draining water to prevent freezing in winter,
For the hot water supply circuit, it is sufficient to close the water supply valve 27 outside the main body 1 and open the drain valve 17, and the water in the heat exchanger 2 and the hot water supply pipe 12 is drained from the drain pipe 16, and in this case, the water supply pipe 11 and the hot water supply By connecting the pipe 12 with the bypass pipe 28, water can be drained from the water supply pipe 11, and damage to the pipe etc. due to freezing can be prevented.

Also, in order to drain the circulation circuit, it is sufficient to open the drain valve 20.
Water in the circulation heat exchanger 3 and the circulation pump 8 as well as in the outgoing pipe 9 between the two is drained through the drain pipe 18.

After draining water in this manner, it is necessary to prime the circulation pump 8 with water when reusing it or when installing the equipment.

To perform this priming, first open the water supply valve 27 to fill the hot water supply circuit with water, and then connect the drain pipe 16 to the drain pipe 18 using the hose 21 as shown by the dotted line.

When the drain valve 17.20 is opened, water is injected from the hot water supply circuit into the circulation pump 8 through the drain pipe 16, hose 21, and drain pipe 18. After a predetermined amount of water has been injected, the drain valve 17.20 is closed and the hose 21 is injected with water. is removed from the drain pipe 17.

In summary, according to the present invention, in a hot water supply circuit having a circulation pump, a circulation heat exchanger for heating circulating water by the pump, and a hot water supply heat exchanger for heating flowing water, the above-mentioned circulation Drain pipes are attached to the pump and hot water circuit through drain valves, and a hose connecting both drain pipes is installed on one of the drain pipes, so priming can be done simply by connecting the hose 21 and opening the drain valve. In addition, there is no need to add or change new configurations to the circulation pump or circulation circuit for priming, making the water injection work much simpler than before, and the equipment configuration is also much simpler. Simplified.

In addition, if the hose is removed from one drain pipe after priming, there will be no cross-connection, which is a problem under the Water Supply Act, and thus the present invention has great practical value.

[Brief explanation of the drawing]

The drawing is an overall configuration diagram showing an embodiment of the present invention. 2... Heat exchanger for hot water supply, 3... Heat exchanger for circulation, 8... Circulation pump, 16...
・Drain pipe, 17...Drain valve, 18...
Drain pipe, 20...Drain valve, 21...Hose.

Claims (1)

[Scope of utility model registration request] A hot water supply circuit having a circulation pump, a circulation heat exchanger for heating circulating water by the pump, and a hot water supply heat exchanger for heating flowing water, wherein drain pipes are connected to the circulation pump and the hot water supply circuit, respectively. Attach via a drain valve, attach one end of a hose long enough to connect both drain pipes to one drain pipe,
Normally, the other end of the hose is open, and when water is injected into the circulation pump, the other end of the hose is connected to the other drain pipe, and both drain valves are opened to circulate water from the drain pipe of the hot water supply circuit through the hose. A two-circuit water heater characterized by injecting water through the drain pipe of the pump.