JPS59219644A - Electric water heater - Google Patents

Abstract

PURPOSE:To prevent an unnecessary consumption of the daytime power supply and to prevent an occurrence of a power consumption peak by so constructing that when a predetermined quantity of hot water is consumed, the electricity is automatically supplied to a heater for daytime power use by a water supply integrating meter means. CONSTITUTION:A power supply control means 12 that controls the power supply to a heater 5 for daytime power use based on signals from a water supply integrating meter means 11 and a water temperature detection means 9 has a volume 13 for setting a hot water temperature and a volume 14 for setting an integrated value of water supply. In tis constitution, the power supply control means 12 turns off the daytime heater 5 and clears the water supply integrated value to zero while the nighttime power can be used. Outside such hours, based on signals from a water supply integrating means 11 and a water temperature detection means 9, it works so that the daytime heater may be operated when the water supply integrated value is above the set value and the water temperature is below the set value.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric water heater of a hot water storage type that uses late-night power and daytime power.

Conventional structure and its problems As shown in Fig. 1, this conventional small electric water heater has a hot water tank 1 with a water supply pipe 2 connected to the bottom and a hot water outlet pipe 3 connected to the top. The heater 4 and the heater 6 for daytime power are installed, and the heater 4 for late night power is turned off. It was connected to a power source via a time switch 8 for controlling the past hours and a thermostat 6 provided near the heater, and the daytime power heater 6 was connected to the power source via a thermostat 7.

In such a configuration, the daytime power thermostat 7 is located at the bottom of the hot water tank 1 and is at the same height as the nighttime power thermostat 6, so as soon as water is added to the hot water tank 1 due to hot water tap, the thermostat is turned on. When the water is turned on, waste heat from the expanding water and heat radiation from the tank surface increase, which is uneconomical and reduces the amount of hot water (it also operates at the intersection, resulting in frequent on/off cycles and shortened durability).

Furthermore, since the heater 6 for daytime power is energized whenever the thermostat turns on, it may be energized even during late-night power supply, resulting in a power peak. For this reason, in apartment buildings, etc., the power receiving equipment is energized.
It was necessary to make it large to accommodate 7.

Furthermore, daytime power, which is more expensive than late-night power, is always supplied, which is very economically disadvantageous.To avoid this, a manual switch 10 is provided to arbitrarily turn on the power to the daytime power heater 5. Although it could be done, it was very cumbersome and practically impossible for daily operation.

OBJECT OF THE INVENTION The present invention solves the problems of the conventional technology, and provides energy-saving and economical electricity supply by automatically performing effective daytime power supply using hot water temperature detection means and water supply amount integration means. The purpose is to provide water heaters.

Structure of the Invention In order to achieve all of these objects, the invention has a hot water temperature detecting means and a water supply amount integrating means provided in the water supply pipe, and an energization control means receives signals from both means and outputs the signals to the daytime power heater. Controls energization (1ζ configuration).

In this configuration, when a predetermined amount of hot water is supplied according to a signal from the water supply amount integrating means, power is automatically supplied to the heater for daytime power, and power is not supplied during the time when power can be supplied late at night. Since this is not carried out, it is possible to prevent wasteful daytime power supply and also to prevent power peaks from occurring, resulting in energy-saving and economical power supply.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 2, the lower part of the hot water storage tank 1 has a water supply pipe 2 installed at the lower part and a hot water outlet pipe 3 connected to the upper part.
A heater 4 for late-night power use and a heater 6 for daytime power use are installed above the heaters 4 and 6, and a hot water temperature detection means 9 for detecting the temperature of hot water in the hot water storage tank 1 is installed, and a water supply amount integrating means 11 and a hot water temperature detection means are installed above the heaters 4 and 6. An energization control means 12 is provided which receives a signal from the means 9 and controls the energization of the heater 6 for daytime power. Further, the energization control means 12 is provided with a volume 13 for setting the hot water temperature and a volume 14 for setting the integrated value of water supply.

In the above configuration, as shown in FIG. 3, the energization control means 12 turns off the daytime power heater 6 and clears the water supply amount integrated value to zero during the time when late-night power can be energized, but otherwise. In response to signals from the water supply amount integrating means 11 and the hot water temperature detecting means 9, the daytime power heater is operated when the water supply amount integrated value is above the set value and the hot water temperature is below the set value.

Effects of the Invention The electric water heater in which the energization of the heater for daytime use is controlled by the energization control means of the present invention provides the following effects.

(1) Energization of the daytime power heater can be reliably controlled by detecting the amount of water supplied and the temperature of hot water.

(2) Since the heater for daytime power is energized automatically and rationally only after the amount of hot water reaches a set value or more, there is no wasteful consumption of daytime power, which is economical.

Even if a large amount of hot water is suddenly supplied, there is no need to worry about running out of hot water because the heater is quickly energized during the day.

(4) Since simultaneous energization of the late-night power heater and the daytime power heater is prevented, there is no power peak and the capacity of the power receiving equipment can be reduced.

(f) Since the hot water temperature and the amount of hot water supply at which the daytime power heater starts energizing can be set arbitrarily, it is possible to produce further economic effects by combining the hot water temperature and the amount of hot water supply.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional electric water heater, FIG. 2 is a block diagram showing an embodiment of the electric water heater of the present invention, and FIG. 3 is a control flowchart of the energization control means of the electric water heater. 1...Hot water tank, 4...Heater for late-night electricity, 6...Heater for daytime electricity, 9...
Water temperature detection means, 11 water supply amount integration means, 12...
Electricity control means, 13... Volume for setting hot water temperature, 14.
...Water supply amount integration setting volume.

Claims (3)

[Claims] (1) A late-night power heater, a daytime power heater, a hot water temperature detection means installed in the can body, a water supply amount integrating means provided in a water supply pipe connected to the lower part of the can body, the hot water temperature detection means and the water supply amount. An electric water heater comprising an energization control means for controlling energization of a daytime power heater based on a signal from an integrating means. (2) The electric water heater according to claim 1, wherein the water supply amount integrating means is configured to return to the initial value during the late-night power accumulation and at the start of energization to the daytime power heater. (3) The electric water heater according to claim 1 or 2, wherein the energization control means is configured to be able to preset the integrated water supply amount and hot water temperature for energizing the daytime power heater.