JPH0827019B2 - Water heater - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a hot water supply apparatus having a function of reheating a bathtub by high-temperature hot water and a normal hot water supply function for a kitchen, a washroom, and a shower.

2. Description of the Related Art In recent years, hot water supply devices have come to have a bath reheating function by supplying high-temperature water of 80 ° C. to 95 ° C. to a bathtub.

Hereinafter, an example of the above-described conventional hot water supply device will be described with reference to the drawings.

FIG. 2 is a block diagram of a conventional hot water supply apparatus, in which 1 is a water heater, 2 is a normal hot water supply pipe, and 3 is a bathtub. Reference numeral 4 denotes a water amount sensor, which operates when a predetermined amount of water flows. Reference numeral 5 is a heat exchanger, 6 is a temperature sensor, and 7 is a branch point, which is divided into a hot water supply pipe line 8 and a bathtub pipe line 14. A valve device 13 has a closing function and a water amount control function. A burner 15 heats the heat exchanger 5.

The operation of the hot water supply device configured as described above will be described below.

First, the hot water supply circuit flows in the order of the water amount sensor 4, the heat exchanger 5, the temperature sensor 6, the branch point 7, the hot water supply pipe line 8, and the hot water supply pipe 2.
On the other hand, the reheating circuit using the hot water flows from the water amount sensor 4 to the heat exchanger 5 to the temperature sensor 6 to the branch point 7 to the valve device 13 to the bathtub pipe 14 to the bathtub 3. Then, at the time of hot water supply operation, hot water of a desired temperature flows in the hot water supply circuit and is used for a shower or the like.
On the other hand, during the reheating operation, the valve device 13 opens and the water amount sensor 4
And, by the action of the temperature sensor 6 or the like, hot water of 80 ° C to 93 ° C flows into the reheating circuit, reaches the bathtub 3, and heats the bath with high-temperature water.

Problems to be Solved by the Invention However, in the above-described configuration, if the hot water tap 2a is opened during hot bath heating with high-temperature water, high-temperature water may flow into the hot-water supply circuit, which may cause burns. Had a point.

In view of the above problems, the present invention, when hot water is used during reheating, high-temperature water for additional heating flows to the hot-water supply circuit as it is, so that hot water does not burn, so that cold water cannot be burned. The present invention provides a hot water supply device in which the water is mixed with the water, and then the water is made to flow into the hot water supply circuit.

Means for Solving the Problems In order to solve the above problems, the water heater of the present invention is
On the downstream side of the heat exchanger for hot water supply, branch into a bathtub conduit for hot water supply to the bathtub and a hot water supply conduit for hot water supply to another place, and a valve device is installed in the bathtub conduit, and a check valve is provided on the hot water supply conduit. A valve and a water flow switch that operates during hot water supply to set the hot water temperature for hot water supply, and branches from the upstream side of the water supply path to the heat exchanger to the downstream side of the check valve in the hot water supply path The bypass pipe is provided with a pipe, which opens when the water flow switch operates while the hot water is flowing into the bathtub pipe and closes after a predetermined time.

Effect The present invention has the above-described configuration, when hot water is used during reheating, high-temperature water for reheating in the hot water supply pipe and cold water from the upstream side of the heat exchanger via the bypass pipe / bypass valve. By setting the hot water temperature of the hot water while mixing and lowering the temperature of the hot water flowing in the bathtub pipe until the bypass valve closes after a lapse of a predetermined time from the start of hot water, hot water that does not burn Can provide a safe hot water supply device.

Embodiment A hot water supply apparatus according to an embodiment of the present invention will be described below with reference to the drawings. The same parts as those in the above-mentioned conventional example are designated by the same reference numerals, detailed description thereof will be omitted, and different parts will be mainly described.

FIG. 1 shows a configuration diagram of a hot water supply apparatus according to an embodiment of the present invention, in which a bypass pipe 11 is provided from the upstream side of the heat exchanger 5.
Of the hot water supply pipe 8 after branching through the bypass valve 12
The check valve 9 is connected so as to join the downstream side of the check valve 9, and the water flow switch 10 is connected further downstream thereof.

The operation of the hot water supply device configured as described above will be described. Ordinary single use is the same as the conventional example. That is, when using the hot water supply, when the hot water tap 2a is opened, the water flows from the water amount sensor 4 → the heat exchanger 5 → the temperature sensor 6 → the check valve 9 → the water flow switch 10 → the hot water supply pipe 2 to preset the appropriate hot water temperature. The hot water that came out comes out. On the other hand, when using reheating, the valve device 13
By turning on, the water amount sensor 4 → heat exchange 5 → temperature sensor 6 → valve device 13 → bathtub conduit 14 → bathtub 3 and bath heating circuit are formed to boil the bath. At that time, the bypass valve 12
Always be in the ON state (that is, "open"). However, the cold water does not flow to the bath side due to the action of the check valve 9. When the hot water tap 2a is opened during hot water heating (hot water supply operation), hot water flows into the hot water supply circuit, the water flow switch 10 is turned on, and the hot water temperature is set from the hot water temperature (80 to 93 ° C) to the appropriate hot water temperature ( 42 for shower
At the same time, the cold water is mixed with the hot water supply pipe 8 through the bypass pipe 11 and the bypass valve 12 at the same time, so that the hot water for additional heating is moderated in terms of temperature, and burns are prevented. Then, the bypass valve 12 turns on the water flow switch 10.
After that, it closes in 5 to 20 seconds. That is, if the bypass valve 12 is left open, the temperature sensor 7, the heat exchanger 5, and the burner 15 cannot control the temperature of the hot water supply. That is, the confluence point 16 of the hot water supply pipe 8 and the bypass pipe 11 is on the downstream side of the heat exchanger 5, and the cold water from the bypass pipe 11 mixes with the hot water supply temperature. Therefore, it is necessary to close the bypass valve 12 promptly after reaching the purpose of relaxing the high temperature water (after 5 to 20 seconds). As a result, after 5 to 20 seconds, the normal hot water supply temperature is controlled to a suitable hot water supply temperature. That is, after the high-temperature water for additional heating is relaxed in temperature, the normal hot water supply operation state is automatically established. When the hot water tap 2a is closed and the use of hot water is stopped, the water flow switch 10 turns off without sensing the water flow. After the water flow switch 10 senses hot water supply from the hot water tap 2a, the heat exchanger 5 continues to be in a hot water supply operation state in which it is controlled to a normal hot water supply temperature. During the period, the bathtub 3 is inevitably supplied with hot water at an appropriate temperature, and the hot reheating hot water is in an interrupted form. Therefore, when the water flow switch 10 is turned off, the operation state of the hot water supply suitable temperature until now is stopped, and the control is automatically performed so that the hot water reheating operation can be returned to.

As described above, according to this embodiment, the hot water supply pipe line 8 is provided with the check valve 9 and the water flow switch 10, and the bypass pipe branching from the upstream side of the heat exchanger 5 to reach the downstream side of the check valve 9. By providing 11 and bypass valve 12, when hot water is used during reheating with high-temperature water, cold water flows to the hot-water supply circuit side (5 to 20 seconds), so that high-temperature water is relaxed in temperature To prevent After the high-temperature water is further alleviated, the bypass valve 12 is closed to enter the normal hot water supply operation state in which the hot water supply temperature is controlled appropriately. Further, by providing the check valve 9 and keeping the bypass valve 12 in the “open” state during the reheating, the function of relaxing the high temperature water by the cold water works even when the water flow switch 10 is inoperative. Can be prevented. In this embodiment, the position of the water flow switch 10 is on the downstream side of the confluence 16 of the bypass pipe 11 with the hot water supply pipe line 8, but may be on the upstream side.

EFFECTS OF THE INVENTION As described above, the present invention, on the downstream side of the heat exchanger for hot water supply, branches into a bathtub conduit and a hot water supply conduit, the bathtub conduit is provided with a valve device, and the other hot water supply conduit is provided. Is provided with a check valve and a water flow switch that operates at the time of hot water supply to set the hot water temperature of the hot water, and a bypass pipe and the bathtub pipe branching from the upstream side of the heat exchanger to the downstream side of the check valve. Since there is a bypass valve that opens when hot water is flowing and closes after a specified time when hot water starts to flow, hot water does not come out even when hot water is used during hot water bath heating. , It is possible to prevent burns, and after a predetermined time, the normal hot water supply operation state can be achieved, and comfortable hot water supply can be secured.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a hot water supply device according to an embodiment of the present invention,
FIG. 2 is a block diagram of a conventional hot water supply device. 4 ... Water amount sensor, 5 ... Heat exchanger, 6 ... Temperature sensor, 7 ... Branch point, 8 ... Hot water supply pipe, 9 ... Check valve, 10
...... Water flow switch, 11 …… Bypass pipe, 12 …… Bypass valve, 13 …… Valve device, 14 …… Bath line, 15 …… Burner.

Claims (1)

[Claims] 1. A downstream side of a heat exchanger for hot water supply, a hot water supply pipe for supplying hot water to a bathtub and a hot water supply pipe for supplying hot water to another place are branched.
The bathtub pipe is provided with a valve device, the hot water supply pipe is provided with a check valve and a water flow switch which operates at the time of hot water supply to set the hot water temperature of the hot water, and is provided upstream of the water supply pipe to the heat exchanger. A bypass pipe that branches from the side to the downstream side of the check valve of the hot water supply pipe, opens when the water flow switch operates while hot water is flowing into the bathtub pipe, and closes after a predetermined time. Hot water supply device provided in the bypass pipe.