JPH057530A - Hot water supplying device - Google Patents

Abstract

PURPOSE:To remove free chlorine by making use of energy efficient in the title device. CONSTITUTION:For a short time just before boiling of hot water in a hot water storage container 2, a water drawing pump 7 is driven to flow heated water into a circulating path. The qty. of hot water is guessed with the inclination of a temp. rise of the heated water, and the circulation time of hot water is controlled according to the qty. of hot water. The ratio between the initial qty. of water and that of the added water is determined with the temp. fall of hot water when additional water is poured into the container 2. The total qty. of water is guessed with the inclination of temp. rise of hot water. With the additional qty. of water and total qty. of water, the optimum circulation time of hot water is determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device for supplying hot water for beverages at home or office.

[0002]

2. Description of the Related Art In recent years, tap water contains a large amount of free chlorine because it has been sterilized by chlorine, and therefore has a so-called chlorine odor (chlorine odor). Therefore, in the conventional hot water supply device, by boiling for several minutes, free chlorine in the water is released into the atmosphere to remove the odor of chlorine in tap water.

[0003]

However, there is a limit to the removal of free chlorine by the above method, and it has not been possible to remove free chlorine sufficiently and in a short time. In addition, there is a problem in that when the water is boiled for a long period of time, the steam generated by the hot water supply device moistens the indoor air or discolors the peripheral equipment.

The present invention is intended to solve the problems of the conventional structure as described above, and has a short circulation time of 8 minutes that minimizes the load on the pump for pumping the odorous components in the hot water. The first object is to provide a hot water supply device that removes water, and the second object is to provide a hot water supply device that can control an optimal circulation time that is shorter if the amount of water is small. A third object of the present invention is to provide a hot water supply device capable of controlling the circulation by a minimum amount of time when the water is added while the water is added.

[0005]

In order to achieve each of the above objects, the first aspect of the present invention is to heat hot water by driving a pump for a short time immediately before the hot water in the hot water storage container boils. The second is to estimate the amount of hot water from the rising gradient of the temperature of hot water to be heated, the circulation time of the hot water is controlled according to the amount of hot water, and the third is to store hot water. The ratio of the initial water amount to the additional water amount is calculated from the decrease in the hot water temperature caused by injecting the additional water amount into the container, and the total water amount is estimated from the slope of the increase in the hot water temperature. Let the circulation time be determined.

[0006]

According to the present invention, the hot water is circulated in the hot water supply apparatus by the first, second and third means, and the activated carbon in the circulation path is brought into contact with the hot water, so that the activated carbon causes the hot water to enter the hot water. Since the free chlorine of is removed by the reaction of (Chemical formula 1) or (Chemical formula 2), it becomes possible to supply delicious hot water with little odor of chlorine.

[0007]

## STR1 ## 2Cl ₂ + H ₂ O → 4HCl + O ₂

[0008]

## STR00002 ## 2Cl ₂ + C + 2H ₂ O → 4HCl + CO ₂ Since the above reaction reacts more rapidly at higher temperatures, it is advantageous to circulate when the water temperature is high, and the circulation time required in proportion to the amount of hot water is short. Therefore, when the concentration of treated water is low, the circulation time becomes short.

[0009]

【Example】

(Embodiment 1) Hereinafter, each embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a hot water supply apparatus according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a body of the hot water supply apparatus, which has a hot water storage container 2 having an inner diameter of 150 mm and a depth of 250 mm. There is. Reference numeral 3 is an inner plug that seals the mouth of the hot water storage container 2, and 4 is an upper lid that covers the upper portion of the main body 1 so as to be openable and closable. 5 is a check valve, which penetrates the inside plug 3 and is inside the hot water storage container 2,
And in communication with the atmosphere. 6 is a motor provided at the bottom between the main body 1 and the hot water storage container 2, 7 is a pump pump driven by the motor 6, and its suction port 8 is in communication with the bottom of the hot water storage container 2. A discharge port 9 of the pumping pump 7 communicates with a discharge pipe 10 that constitutes a pumping path. Reference numeral 11 is a switching valve provided in the middle of the hot water pumping path by the discharge pipe 10, and the hot water is poured from the extraction port 12 into the container or the like through the switching valve 11 or circulates in the hot water storage container 2. It is configured to circulate again in the hot water storage container 2 through the nozzle 13 that constitutes the circulation path.

Also, activated carbon 22 is attached to the nozzle 13, and the hot water passing through this passes through the activated carbon 22. 14 is a heater, which is installed on the lower side surface of the hot water storage container 2. Reference numeral 15 is a start switch for driving the motor 6 and a variable resistor, which is operated by the push operation of the push button 16 via the rod 17. 18 is a compression type spring, which is always a rod 17
Is urged to push up. 19 is a switching valve 11
The switch valve 11 is switched to either the extraction port 12 side path or the activated carbon 22 side which is a circulation path by operating this switch.

The operation of the above embodiment will be described below. When supplying hot water in the hot water storage container 2, the push button 16 is pushed down. That is, the start switch 15 is turned on by the push-down operation of the push button 16, and the resistance is changed by further pushing to change the supply voltage, and the motor 6 is energized. The pump 6 operates by energization of the motor 6, sucks the hot water stored in the hot water storage container 2 from the suction port 8 of the pump 7, and discharges it from the discharge port 9 to the discharge pipe 10.

At this time, if the switch 19 is operated to open the switching valve 11 in the path of the extraction port 12 side, hot water is supplied from the extraction port 12 to the outside. At this time, if the switching valve is opened on the circulation path side, the hot water is poured into the activated carbon 22 through the nozzle 13, purified in the activated carbon 22, and then circulated again in the hot water storage container 2.

By the way, according to "Investigative research and test results of water quality laboratory at Osaka City Waterworks Bureau in 1987", the average (x) of the annual average free chlorine concentration at 33 water sampling locations in the city is 0.63 pp.
The m and the deviation (σ) are 0.12. Therefore, since x + 3σ = 0.99, 1.0 ppm of free chlorine can be said to be a sufficiently high concentration.

Regarding the threshold value of free chlorine, the Tasty Water Study Group of the Ministry of Health and Welfare states that ordinary people do not care if the residual chlorine concentration is 0.4 ppm or less. Therefore, hypozinc acid was added to odorless water to make 0.1, 0.2, 0.3 and 0.4 ppm solutions,
A sensory test was conducted on five people. As a result, the smell of chlorine is 0.2p
There were two people who felt it at pm or more, but none felt it at 0.1 ppm.

From these results, if the water containing 1.0 ppm of free chlorine as described above can be lowered to a concentration of 0.1 ppm or less, most people will not feel the odor of chlorine.

[0016]

[Outer 1]

In FIG. 2, a is a change in the concentration of free chlorine only by ordinary heating, b is a hot water temperature of 63.5 ° C. to 95 ° C. for about 8 minutes, and c is a hot water temperature of 73.5 ° C. to 95 ° C. 5.5 minutes, d shows the change in the concentration of free chlorine when circulating through activated carbon 22 for about 3.5 minutes from 83.5 ° C to 95 ° C. As is clear from this, the circulation from a high temperature has a large gradient and the removal performance of free chlorine is high, and it is effectively removed in a short time. And free chlorine concentration in circulation for about 8 minutes
It was possible to reduce 1.0 ppm of water to 0.1 ppm or less. Ie 8
The circulation of more than a minute is unnecessary from the viewpoint of the effect of removing free chlorine and wastes voltage energy.

(Embodiment 2) FIG. 3 is a diagram showing a second embodiment. Members having the same functions as those in FIG. 1 are designated by common reference numerals, and other reference numerals 20 are temperature detectors for detecting the temperature of the hot water in the hot water storage container 2, and the detection signal thereof is the control device.
Delivered to 21. The control device 21 receives the signal from the temperature detector 20, calculates the amount of water stored in the hot water storage container 2 from the slope of the temperature rise, determines the circulation time from the calculated amount of water, and reaches the temperature at which the time required for boiling is obtained. Then, the motor 6 is controlled to be energized.

The experimental results of this example are shown in (Table 1).

[0020]

[Outside 2]

(Third Embodiment) A third embodiment will be described with reference to FIG. The control device 21 receives the detection signal of the temperature detector 20, and roughly calculates the ratio of the initial amount of water and the amount of additional water that came in from the temperature before the water was added to the hot water storage container 2 and the temperature after the addition. Further, the total amount of water contained in the hot water storage container 2 is calculated from the slope of the temperature rise. Set the free chlorine concentration in the initial water amount to 0.1 ppm, and set the free chlorine concentration in the additional water amount to
If it is 1.0 ppm, the total amount of water contained in the hot-water storage container 2 and the concentration of free chlorine are roughly estimated. The circulation time is determined by the concentration and the amount of water, and when the temperature reaches a temperature at which the time required for boiling is obtained, the motor 6 is energized to start circulation. The experimental results according to this example are shown in (Table 2).

As is clear from this (Table 2), even if the total amount of water is the same, the smaller the amount of additional water, the lower the circulation time, and the more the free chlorine concentration could be lowered sufficiently. By performing such control, it is possible to efficiently circulate free chlorine without wasting energy.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

As described above, according to the first means, the hot water storage container, the heater for heating the water in the container, the pump for pumping the hot water in the container, and the pumping path are provided. The hot water storage container is provided with a switching valve for switching the path to the water injection port and the circulation path to the hot water storage container, the activated carbon is arranged in the middle of the circulation path, and the temperature detector is provided in the hot water storage container. Supplying delicious hot water with a low chlorine content at the time of extraction without wasting energy by operating the pump and allowing water to flow into the circulation path within 8 minutes until the water temperature reaches 100 ° C. It is possible to realize a hot water storage device that can do this.

According to the second means, a container for hot water storage, a heater for heating the water in the container, a pump for pumping the hot water in the container, and a water injection port provided in the pumping path. And a switching valve for switching the circulation path to the hot water storage container, activated carbon is arranged in the middle of the circulation path, the temperature detector in the hot water storage container, and the circulation time can be controlled by the water amount by calculating the water amount. By providing the control device, it is possible to realize a hot water storage device capable of removing a chlorine component without wasting energy in an appropriate circulation time shorter than the first means depending on the amount of water.

Further, according to the third means, a container for hot water storage, a heater for heating the water in the container, a pump for pumping the hot water in the container, and a water injection port provided in the pumping path. A hot water storage container and a switching valve for switching the circulation path to the hot water storage container, activated carbon is arranged in the middle of the circulation path, a temperature detector in the hot water storage container, and an additional water amount and a total water amount when water is added. By providing a control device that can calculate the amount of water and control an appropriate circulation time for the amount of additional water, a hot water storage device that can remove chlorine components without wasting energy at an appropriate circulation time even when water is added is provided. It can be realized.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hot water supply device according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing changes in the concentration of free chlorine in water in the water heater according to the first embodiment of FIG.

FIG. 3 is a vertical cross-sectional view of a hot water supply device illustrating second and third embodiments of the present invention.

[Explanation of symbols]

1 ... Main body, 2 ... Hot water storage container, 6 ... Motor, 7 ... Pumping pump, 11 ... Switching valve, 12 ... Extraction port, 13 ... Nozzle
(Circulation path), 14 ... Heating heater, 20 ... Temperature detector, 21
… Controller, 22… Activated carbon.

Continued front page    (72) Inventor Kaoru Maekawa             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (3)

[Claims] 1. A heater for heating hot water or water in a hot water storage container, a pump for pumping the hot water or water, a route to a water inlet provided in the pumping route, and a circulation route to the hot water storage container. In a hot water supply device equipped with a switching valve for switching between the above, the activated carbon arranged in the circulation path, and a temperature detector, the hot water pump in the hot water storage container is driven and heated for a short time immediately before boiling. A hot water supply device, which controls the generated hot water to flow through the circulation path. 2. The hot water supply apparatus according to claim 1, wherein the amount of hot water is estimated from the rising gradient of the heated hot water temperature, and the hot water circulation time is controlled according to the hot water amount. 3. An additional amount of water is injected into the hot water storage container, and the ratio of the initial amount of water to the additional amount of water is calculated from the decrease in the temperature of the hot water resulting from the addition.
By estimating the total amount of water from the slope of the rise in hot water,
The hot water supply apparatus according to claim 1, wherein an optimum circulation time of hot water is determined from the additional water amount and the total water amount.