JPS5920573Y2 - water heater - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a water heater using a heat pump type heating device.

First, this type of water heater that has been conventionally used will be explained.

In FIG. 1, 1 has a heat pump cycle formed by a compressor, a four-way switching valve, a heat exchanger on the heat source side, a throttle, and a heat exchanger on the user side (none of which are shown). 2 is a hot water tank; 3 is an outbound circulation circuit for sending the hot water heated by the user-side heat exchanger of the heat pump heating device 1 to the hot water tank 2; 4 is a part of the return circulation circuit 5; 6 is a distern tank, and 7 is a ball tap, which is installed inside the distern tank 6 and allows the tap water that has passed through the pressure reducing check valve 9 provided in the water pipe 801 section to be disposed of. Replenishment and stopping are automatically performed depending on the water level in the stern tank 6.

Reference numeral 10 denotes a water supply pipe, which communicates with the distillation tank 6 and the lower part of the hot water tank 2.

A hot water supply pipe 11 communicates the upper part of the hot water tank 2 with the faucet 12 at the end.

When hot water is supplied using the water heater described above, the temperature of the hot water heated to the heater 1 during normal operation of the pump heating device 1 is (for example, around 50'C), and the temperature of the hot water heated to the heater 1 during normal operation is around 50'C. The temperature is lower than that of a boiler, etc., and the hot water at a low temperature is supplied to the hot water tank 2 immediately after the start of operation.

In this case, the temperature boundary layer of hot water inside the hot water tank 2 is broken, the water temperature is averaged, and the water passes through the hot water pipe 11 to the faucet 12.
There was a drawback that the temperature of the hot water flowing out was lower.

This invention was made to eliminate the above-mentioned drawbacks.

In FIG. 2, the same symbols as those in the conventional water heating system circuit shown in FIG. 1 indicate the same or equivalent parts.
The explanation will be omitted.

13 is a temperature type three-way switching valve, 13 a, 13 b
, 13C are connection ports of temperature type three-way switching valves, and 13b is connected to the end of a bypass pipe 15 connected from the middle of the outgoing circulation circuit 3.

Further, the connection ports 13a and 13C are connected to a part of the return circuit 5, and are in communication with each other during normal operation.

Reference numeral 14 denotes a temperature sensing portion of the temperature-type three-way switching valve 13, which switches the communication state of the connection ports 13a to 13C of the temperature-type three-way switching valve 13 at the upper and lower limits of a predetermined temperature, respectively.

That is, the connection ports 13a and 13C are opened and the connection port 13b is closed, and the connection ports 13b and 13C are opened and the state is changed to the connection port 13a, or vice versa. .

Next, the operation will be explained.

During normal operation, the first circulation path is formed as shown by the solid arrow, and the hot water heated by the heat pump type heating device 1 is
The hot water passes through the outward circulation circuit 3 to the hot water tank 2, and from the hot water tank 2 to the heat pump type heating device 1, increasing the temperature of the hot water in the hot water tank 2.

Then, hot water is supplied from the faucet 12 through the hot water supply pipe 11.

Further, when hot water is supplied and the water level in the hot water tank 2 falls, makeup water is sent from the distern tank 6 to the lower part of the hot water tank 2 through the makeup pipe 10, and is provided in a part of the return side circulation circuit 5. The cycle of heating and supply is repeated in the heat pump type heating device 1 by being pulled by the circulation pump 4.

On the other hand, when hot water supply is interrupted and stopped and hot water is supplied again, the hot water in the outgoing circulation circuit 3, the returning circulation circuit 5, and the water circuit inside the heat pump type heating device 1 is at a relatively low temperature. When the temperature sensing part 14 of the three-way switching valve 13 senses that the temperature is below a certain level, the connection port 1
From the communication state of 3a, 13C to the connection port 13b,
23C is switched to the communication state.

In this case, the circulating water forms a second circulation path as shown by the dotted arrow, and is not supplied to the hot water tank 2 through the bypass pipe 15.

In such a cycle, when the temperature of the circulating water exceeds a certain level, the temperature sensing part 14 of the temperature-type three-way switching valve 13 senses the temperature, closes the bypass pipe 15, and returns to the normal operation pattern.

In addition, bypass piping 15 is used instead of temperature type three-way switching valve 13.
The same effect can be achieved by providing electromagnetic valves on the outgoing or incoming circulation path, and controlling these electromagnetic valves by appropriately switching them using a temperature sensor.

As described above, according to this invention, when the hot water temperature on the outbound side of the circulation circuit is below a predetermined temperature, the hot water tank is diverted,
Since hot water is circulated between the hot water tank and the heat pump type heating device only after the temperature reaches a predetermined temperature, low hot water is supplied to the hot water tank at the start of operation, which was a drawback with conventional devices, and the temperature inside the hot water tank is increased. breaking the temperature boundary layer,
This eliminates the problem of hot water being supplied at a low temperature, and has the advantage that the water temperature always supplied to the hot water tank is higher than a certain level.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a water heater equipped with a conventional heat pump type heating device, and FIG. 2 is a circuit diagram of a water heater equipped with a heat pump type heating device showing an embodiment of this invention. Note that the same reference numerals indicate the same or equivalent parts. In the figure, 1 is a heat pump type heating device, 2 is a hot water tank,
3 is an outbound circulation circuit, 5 is a return circulation circuit, 13 is a temperature type three-way switching valve, and 15 is a bypass pipe.

Claims (1)

[Scope of utility model registration request] A heating device of Mi 1 to Pof 1 type that heats water by a pump cycle to Hea 1, a hot water supply that stores hot water obtained by this heating device or hot water heated by this hot water, and a hot water tank provided in this hot water tank, In a hot water supply device comprising a hot water inlet for supplying hot water or hot water to the outside, and a circulation circuit that connects the heating device and the hot water tank and circulates the hot water, a side path of the hot water tank connecting the hot water tank, a first circulation path between the heating device and the side path, or a second circulation path between the heating device and the hot water tank. A switching valve for switching the circulation circuit, and a temperature detector for detecting the hot water temperature on the outbound side of the circulation circuit and controlling the switching valve, and when the hot water temperature is below a predetermined temperature, the temperature sensor detects the A water heater characterized in that the first circulation path is formed by switching a switching valve.