JPH05264099A - Electric water warmer with bath hot water leveling function - Google Patents

Abstract

PURPOSE:To provide an electric water warmer which is easily used by insulating after supply of hot water to a bathtub is completed by effectively using hot water heated by inexpensive night power, alleviating a running cost to use the hot water even after supply of hot water is finished. CONSTITUTION:A controller 23 additionally supplies hot water in a hot water storage tank 11 to a bathtub to insulate it while a residual hot water thermistor 13 of the tank 11 senses residual hot water of a set value or more, stops the additional supply of the hot water from the tank 11 when the thermistor 13 senses residual hot water of a set value or less or when a highest level of a bathtub 10 is detected by a water level sensor 18 for detecting a water level of the bathtub 11, and then insulates it by a bath temperature keeping heater 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater having a bath filling function, which automatically keeps warm water after the bath is filled.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional electric water heater with a bath filling function. Generally, the hot water in the hot water storage tank 1 that is boiled at a low price at midnight is mixed with water in the hot water mixing unit 2,
The bathtub 3 is filled with water at the set temperature and water level. After that, in order to keep the temperature drop due to heat radiation until the bathing at the set temperature, the hot water in the bathtub 3 is circulated at certain intervals.
The temperature is detected by the bath thermistor 5, and if the detected temperature is lower than the set temperature, the reheating heater 6 installed in the circulation path is energized to boil to the set temperature and keep the hot water in the bathtub 3 warm. Was there.

[0003]

However, in the conventional configuration as described above, the bathing time is generally high during the daytime power hours (generally from 7 am to 11 pm).
Therefore, the electricity cost to keep the hot water in the bathtub relatively high is high, especially when the hot water in the hot water storage tank that was boiled at midnight remains, and the hot water that is originally used for keeping warm remains. To no avail.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to effectively use hot water boiled with a low-priced late-night power to reduce running costs.

[0005]

In order to achieve the above object, the electric water heater with a bath water filling function of the present invention keeps the hot water in the bathtub warm after the completion of the water filling in the bathtub. While the hot water thermistor detects the amount of hot water remaining above the set value, the hot water in the hot water storage tank is kept hot by keeping hot water, and when the hot water thermistor detects the amount of hot water remaining below the set value, or When the water level sensor that detects the water level detects the maximum water level in the bathtub, the hot water supply from the hot water storage tank is stopped, and a control unit is provided to control the temperature to be maintained by the reheating heater.

[0006]

According to the present invention, due to the above-mentioned constitution, the empty hot water storage tank boiled with the late-night electric power remains, and when the water level of the bathtub does not reach the maximum water level, the hot water of the hot water storage tank is poured into the bathtub. Then, when the hot water in the hot water storage tank falls below the set water level or when the water level in the bathtub reaches the maximum water level, the reheating heater is energized to keep it warm, and it is boiled with midnight power. The hot water in the hot water storage tank is effectively used to reduce running costs.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an electric water heater with a bath hot water filling function. 10 is a bathtub, 11 is a hot water storage tank, and 12 is a hot water storage tank 1.
A boiling heater for boiling the water in 1, 13 a, b,
c, d, e are a plurality of residual hot water thermistors for detecting the residual hot water of the hot water storage tank 11, 14 is a hot and cold water mixing section for mixing the hot water of the hot water storage tank 11 and water from a different route to a set temperature, and 15 is the bathtub 10
Check valve for preventing backflow from the hot water, 16 is a pouring pipe for dropping the hot water mixed in the hot and cold water mixing section into the bathtub, 17 is a bath thermistor for detecting the temperature of the mixed hot water, and 18 is a water level for detecting the water level of the bathtub 10. A sensor, 19 is a circulation pipe provided to circulate the hot water in the bathtub 10, 20 is a check valve for preventing the hot water from flowing from the pouring pipe 16 into the circulation pipe 19, and 21 is a circulation for forcibly circulating the hot water in the bathtub 10. A pump, 22 is a reheating heater for reheating the hot water in the bathtub 10, 23 is hot water filling the bathtub 10,
And a control unit that controls the temperature to be maintained at the set temperature.

In the above configuration, the nighttime electric power is supplied to the heater 12 in the midnight time zone (generally from 11:00 pm to 7:00 am) at a low price to boil the water in the hot water storage tank 11 to the set temperature. And put. Then, when pouring water into the bathtub 10 for bathing, the hot water mixing unit 14 mixes the hot water of the hot water storage tank 11 with water from a different route so that the temperature detected by the bath thermistor 17 becomes the hot water filling set temperature. The controller 23 adjusts the mixing ratio of hot water and water. The mixed hot water having the set temperature is dropped into the bathtub 10 from the pouring pipe 16, and when the water level of the bathtub 10 detected by the water level sensor 18 reaches the set water level, the dropping of the hot water into the bathtub 10 is stopped and the hot water filling is completed. It will be completed. And until you actually take a bath
In order to prevent the temperature of the hot water in the bathtub 10 from decreasing, it is necessary to keep it warm.

Next, the heat retaining operation will be described. To keep warm, the hot water in the bathtub 10 is circulated at a predetermined time interval.
Circulation pump 21, check valve 20, pouring pipe 16, bath 1
It circulates to 0, and the bath thermistor 17 makes the bathtub 10
Detects the temperature of. Then, when the detected temperature is lower than the water filling setting temperature, the hot water of the hot water storage tank 11 is dropped at a high temperature through the water mixing unit 14 to reach the water filling setting temperature. At this time, when the residual hot water thermistor 13 detects (for example, the position b) that the residual hot water amount in the hot water storage tank 11 has become smaller than the preset residual hot water amount (for example, the position c of the thermistor 13), or the water level sensor 18 When the maximum water level in the bathtub 10 is detected, the high temperature hot water from the hot water storage tank 11 is stopped and the reheating heater 22 is energized to boil up to the set temperature. In this way, the hot water is kept warm in the bathtub 10 by using as much hot water as possible, which is boiled with low-priced late-night power.

Here, when the residual hot water thermistor 13 detects that the residual hot water amount in the hot water storage tank 11 is smaller than the preset residual hot water amount, the reason for stopping the high temperature hot water from the hot water storage tank 11 is that This is because the hot water is not used only for the bathtub 10 but is left so that it can be used for hot water supply at other places (for example, to the position a of the thermistor 13). Further, when the water level sensor 18 detects the maximum water level in the bathtub 10, the reason for stopping the high temperature hot water from the hot water storage tank 11 is to prevent the hot water from overflowing from the bathtub 10.

[0011]

INDUSTRIAL APPLICABILITY As described above, the present invention detects the amount of remaining hot water in the hot water storage tank that is boiled with low-priced late-night power, and when the amount of remaining hot water is greater than the preset amount of hot water, that is, when the hot water is full. By supplying the hot water from the hot water storage tank to the bathtub at a high temperature to keep it warm, it is possible to effectively use the hot water boiled with low-priced late-night power, and to reduce the running cost required for keeping warm. Also, by keeping the amount of hot water that can be used for heat retention within a preset range, it can be left alone for use in hot water supply places other than bathtubs. It is possible to provide an electric water heater with.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric water heater with a bath filling function according to an embodiment of the present invention.

[Fig. 2] Configuration diagram of a conventional electric water heater with bath hot water filling function

[Explanation of symbols]

 10 Bathtub 11 Hot Water Storage Tank 13 Remaining Hot Water Thermistor 14 Hot Water Mixing Section 16 Hot Water Pipe 17 Bath Thermistor 18 Water Level Sensor 19 Circulating Pipe 21 Circulating Pump 22 Reheating Heater 23 Control Section

Claims (1)

[Claims] 1. A hot water storage tank having a boiling heater provided therein, a plurality of residual hot water thermistors for detecting residual hot water in the hot water storage tank, and hot water in the hot water storage tank and water from a different route are mixed and set. A hot and cold water mixing section for controlling the temperature, a pouring pipe for dropping the hot water mixed in the hot and cold water mixing section into a bath, and a bath thermistor for detecting the temperature of the mixed hot water mixed in the hot and cold water mixing section,
A water level sensor for detecting the water level in the bathtub, a circulation pipe provided to circulate the hot water in the bathtub, and a circulation pump,
A reheating heater that reheats the hot water in the bathtub and a control unit that keeps the hot water in the bathtub warm are provided, and after the completion of filling the hot water in the bathtub, the remaining hot water thermistor has a set value or more. While the remaining hot water is being detected, the hot water in the hot water storage tank is kept hot by hot water, and when the remaining hot water thermistor detects the remaining hot water below a set value, or the water level sensor is in the bathtub. When the maximum water level is detected, an electric water heater with a bath water filling function that controls to stop hot water from the hot water storage tank and keep it warm by the reheating heater.