JPS594835A - Hot water supply device - Google Patents

Abstract

PURPOSE:To reduce a thermal loss of radiation from a pipe and enable hot water to be applied from the terminal unit of hot water supply device by a method wherein a cold water in the pipe is moved to a cold water storage tank and hot water is controlled to be filled from the hot water storage tank when the hot water termial unit is changed from its closed condition to its open condition. CONSTITUTION:When the hot water terminal unit 6 is opened, the switch 7 is operated, and the pump 3 is operated. At this time, the change-over valve 2 is connected in its first direction, so that cold water filled in the pipe 4 is pushed up into the cold water storage tank 5 and the hot water is filled from the hot water storage tank 1. A temperature sensor 8 detects the hot water, a change-over valve 2 is operated with AND condition in cooperation with ON signal of the switch 7, the valve is connected in the second direction and then the hot water is fed from the hot water feeding terminal unit 6. That is, the hot water is fed at once from the hot water terminal unit 6. Then, when the hot water terminal unit 6 is closed, the switch 7 is turned off, the change-over valve 2 is changed over at once in the first direction, an operation of the pump 3 is also terminated, so that the cold water stored in the cold water storage tank 5 is returned back into the pipe 4 under its head difference and the hot water filled in the pipe 4 is pushed back to the hot water storage tank 1.

Description

[Detailed Description of the Invention] The present invention connects a high temperature hot water storage tank and a hot water supply terminal such as a faucet with a long pipe, and hot water is constantly stored in the pipe so that hot water can be immediately supplied when the hot water supply terminal is opened. Regarding water heaters.

Such water heaters have the disadvantage that when hot water supply is finished, the hot water that remains in the pipe radiates heat and causes heat loss, and even after hot water supply is restarted, only the low-level hot water in the pipe comes out from the hot water terminal (so-called The disadvantage was that the start-up was slow.

The present invention has been made in view of these drawbacks, and will be described below with reference to embodiments shown in the drawings.

In the figure, (1) is a high-temperature hot water storage tank heated by a heater (not shown) and stores high-temperature water, (2) is a two-way switching valve, and a pipe (4) with a pump (3) interposed between them. is connected. (5) is a low-temperature hot water storage tank for storing low-temperature water, and is connected to the first output side of the switching valve (2). Further, the low temperature hot water storage tank (5) is arranged at a higher water level than the high temperature hot water storage tank (1). +8
), +8)... are hot water supply terminal devices such as faucets, and are connected to the second direction on the output side of the switching valve (2).

(71, (71 is a switch that detects the open state of the hot water supply terminal (6), and when it is in the ON state, it issues a control signal to the switching valve (2) and an activation signal to the pump (31). (8) This is a temperature sensor installed on the pipe (4) near the input side of the switching valve (2), and detects that the pipe (4) is filled with low-temperature water and detects the temperature on the output side of the switching valve (2). is made conductive in the first direction, that is, toward the low-temperature hot water storage tank (5), detects that the pipe (4) is filled with high-temperature water, and operates the switching valve in an AND state with the ON signal of the switch (7). The output side of (2) is controlled to be conductive in the second direction, that is, in the direction of the water heater terminal (6).Note that (9) is a pole tap, and (10) and (10) are air vent valves.

Such a water heater operates as follows. Hot water supply terminal (
6), the switch (7) is activated and the pump (3) is activated. At this time, the switching valve (2) is connected in the first direction, so the low temperature water filling the pipe (4) is pushed up into the low temperature hot water storage tank (5) and the high temperature water is flowing into the high temperature hot water storage tank. It is filled from (1).

Then, the temperature sensor (8) detects high temperature water and the switch (7)
The switching valve (2) is actuated in an AND state with the ON signal of 1 and the switching valve (2) is connected in the second direction, and high-temperature water is supplied from the hot water supply terminal (6). That is, high-temperature water is immediately supplied from the hot water supply terminal (6). Next, when the water heater terminal (6) is closed, the switch (7) is set to 0FFI, and the selector valve (2) is immediately set to the first position.
As the pump (3) stopped operating, the low-temperature water stored in the low-temperature hot water storage tank (5) returned to the pipe (4) due to the head difference and filled the pipe (4). Push the high temperature water back into the high temperature hot water storage tank (1). This operation is then repeated. Furthermore, when the switch (7) is turned ON and OFF within a short period of time, the temperature sensor (8)
) If only the thermal inertia of the device malfunctions, it can be controlled with a timer or the like to achieve the desired operation.

As described above, the hot water supply device of the present invention connects the high temperature hot water storage tank that stores high temperature water and the input side of the switching valve with a pipe, connects the low temperature hot water storage tank that stores low temperature water to one of the output sides of the switching valve, and connects the low temperature hot water storage tank that stores low temperature water to the other output side of the switching valve. When the hot water terminal is closed, the pipe is controlled to be filled with low temperature water from the low temperature hot water storage tank, and when the hot water terminal is switched from the closed state to the open state, the pipe is filled with low temperature water. This system is characterized by controlling the flow of water to a low-temperature hot water storage tank and filling it with high-temperature water from the high-temperature hot water storage tank, thereby reducing heat radiation loss from the pipes and immediately discharging high-temperature water from the hot water terminal. is now available.

[Brief explanation of drawings]

The figure is a schematic diagram of a water heater that is an embodiment of the present invention. patent applicant Matsushita Electric Works Co., Ltd. Representative Patent Attorney Toshimaru Takemoto (2 others) N(rz　　r＼　　(＾

Claims (1)

[Claims] (1) Connect the high-temperature hot water storage tank that stores high-temperature water and the input side of the switching valve with a pipe, connect the low-temperature hot water storage tank that stores low-temperature water to one of the output sides of the switching valve, and connect the hot water terminal to the other side. When the hot water terminal is closed, the pipe is controlled to be filled with low temperature water from the low temperature hot water storage tank, and when the hot water terminal is switched from the closed state to the open state, the low temperature water in the pipe is filled with low temperature water from the low temperature hot water storage tank. 1. A hot water supply device characterized in that the hot water storage tank is controlled to be filled with high temperature water from a high temperature hot water storage tank.