JPH0315972Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water storage type water heater, and particularly to one that has been improved so as to reduce energy loss while hot water supply is stopped for a relatively long period of time, such as at night.

Conventionally, hot water storage type water heaters are configured so that the stored hot water temperature is always maintained at a high set temperature, and when in use, hot water is supplied using a mixer faucet or the like. Therefore, a considerable amount of energy is wasted in order to maintain the stored hot water temperature at, for example, 80° C. even during relatively long periods when hot water is not dispensed, such as at night. In order to eliminate such energy loss, it may be possible to turn off the power to the water heater, but in this case, the temperature of the stored hot water would drop too much. Therefore, in order to reuse the hot water tank, it is necessary to either wait for a slightly longer time after the power is turned on until the temperature of the stored hot water rises to the set temperature, or to discard a large amount of water in the hot water storage tank.

This invention was devised under these circumstances, and the water temperature is such that even if it is lower than the set temperature until reuse, it does not cause any major problems in actual use such as washing the face, taking a bath, cooking, washing dishes, etc. For example, if the hot water temperature is around 45℃, the waiting time for reuse will be significantly shortened, so if the hot water is not tapped for a relatively long period of time, the set temperature will automatically change, causing a major hindrance to actual use. The purpose of the present invention is to change the temperature to a relatively low level that does not cause the occurrence of heat loss, thereby reducing energy loss. Hereinafter, the present invention will be explained in detail based on illustrated examples.

The drawing is a schematic diagram of a hot water storage type water heater according to an embodiment of the present invention, and in the drawing, 1 is a hot water storage tank, 2 is a heat exchanger, 3 is a heat source such as a combustion device, 4 is a water inlet pipe, and 5 is a water inlet. 6 is a control circuit, 7 is built into the control circuit 6, and is reset by turning on the hot water detection means 5, and a time-up is performed when, for example, one hour has passed after the reset. A timer for outputting a signal, 8 a hot water temperature setting circuit built into the control circuit 6, 9 a heat source control circuit built into the control circuit 6, and 10 a hot water temperature detecting section made of, for example, a thermistor. The hot water temperature setting circuit 8 has a low temperature setting circuit 81 that outputs a low temperature signal corresponding to, for example, 45 degrees Celsius, a setting circuit 82 that outputs a setting signal corresponding to, for example, 80 degrees Celsius, and both of these setting circuits 81 and 82 are selectively selected. It consists of a set temperature switch circuit 83 connected to the heat source control circuit 9. This set temperature switch circuit 83 switches the low temperature setting circuit 81 to the heat source control circuit 9 based on the time-up signal of the timer 7.
The hot water detection means 5 is switched to the low temperature side connected to the
The setting circuit 82 is turned on by the on signal of the heat source control circuit 9.
It is configured so that it can be switched to the side connected to. The heat source control circuit 9 is configured to turn on and off the heat sources such as the combustion device 3 in response to the output of the temperature setting circuit 8 so that the temperature of the hot water in the hot water storage tank 1 corresponds to the low temperature signal or setting signal. Water temperature detection section 10
outputs a feedback signal corresponding to the water temperature to the heat source control circuit 9.

Next, the operation of the present invention configured as described above will be explained. First, if hot water is repeatedly dispensed within one hour after the previous hot water dispense ends, the timer 7 is reset by the ON signal output by the hot water dispense detection means 5 without outputting a time-up signal, and the setting circuit 82 side is The positioned temperature setting switch circuit 83 is held as it is on the setting circuit 82 side. However, if the next hot water is not dispensed even after one hour has passed since the previous hot water dispense, the timer 7 outputs a time-up signal and the set temperature switch circuit 8
3 is switched to the low temperature side. This results in
The heat source control circuit 9, which previously operated based on the setting signal, now operates based on the low temperature signal. After this, when hot water is further dispensed, the timer 7 is reset, the set temperature switch circuit 83 is switched to the setting circuit 82 side, and the heat source control circuit 9 is controlled and operated based on the setting signal. In this way, if hot water is not tapped for a predetermined period of time, for example one hour or more, the set temperature of the hot water in the hot water tank 1 will be low enough to not cause any major problems in actual use. It will be switched.

As explained above, the present invention includes a hot water supply detection means for detecting hot water supply, a timer that is reset by a hot water supply detection signal from the hot water supply detection means, a low temperature setting circuit that outputs a low temperature signal corresponding to a predetermined low temperature. The system includes a setting circuit that outputs a setting signal corresponding to a set temperature, and a heat source control circuit that controls the hot water temperature to the set temperature, and selects the setting circuit based on the hot water supply detection signal and the low temperature setting circuit based on the time-up signal of the timer. Since a set temperature switch circuit is provided which is connected to the heat source control circuit, when no hot water is dispensed for a period exceeding the time measured by the timer, the set temperature of the stored hot water is switched to a predetermined low temperature, thereby reducing energy loss. can.

[Brief explanation of the drawing]

The drawing is an overall configuration diagram showing an embodiment of the present invention. 5... hot water detection means, 7... timer, 81...
Low temperature setting circuit, 82... Setting circuit, 9... Heat source control circuit.

Claims (1)

[Scope of utility model registration request] a hot water supply detection means, a timer that is reset by a hot water supply detection signal from the detection means, a low temperature setting circuit that outputs a low temperature signal corresponding to a predetermined low temperature, a setting circuit that outputs a signal corresponding to a set temperature, and a set temperature. and a heat source control circuit for controlling the hot water temperature, and a set temperature switch circuit that selectively connects the setting circuit to the heat source control circuit according to the hot water supply detection signal and the low temperature setting circuit to the heat source control circuit according to the time-up signal of the timer. A hot water storage type water heater featuring: