JP2857241B2 - Water heater - Google Patents

Description

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

2. Description of the Related Art Tap water in recent years contains a large amount of transition metal ions such as iron and manganese eluted from a water pipe. In the conventional hot water supply device, there is no means for removing these transition metal ions, and water using a water purifier cannot completely remove these ions contained in tap water.

Problems to be Solved by the Invention Generally, when tea, black tea, coffee, etc. are made with hot water containing transition metal ions such as iron and manganese, their taste and aroma are reduced, and the color turns black or brown. Happens. As described above, in the conventional hot water supply apparatus, there is no means for removing these transition metal ions, and even with water using a water purifier, these ions contained in tap water cannot be completely removed.

The present invention is intended to solve such a problem, and an object of the present invention is to provide a hot water supply device capable of removing transition metal ions such as iron and manganese in tap water.

Means for Solving the Problems The means of the present invention for achieving the above object is a hot water storage container having a heater, a pump driven by a motor for pumping the liquid in the hot water storage container, A main unit having a circulation path for circulating the water, wherein an inorganic ion exchange material is mounted in the circulation path, and the hot water supply apparatus circulates the liquid through the circulation path by the pump.

The present invention provides a circulation path for circulating water in a hot water storage container, and has a configuration in which an inorganic ion exchange material is attached in the circulation path.By repeating the circulation,
Transition metal ions such as iron and manganese in the hot water are further ion-exchanged, and the removal rate of these transition metal ions can be further increased.

Embodiment An embodiment of the present invention will be described below with reference to FIG. 1 is a hot water supply main body (hereinafter simply referred to as a main body), in which a hot water storage container 2 having an inner diameter of 150 mm and a depth of 180 mm for storing water
Is provided. Reference numeral 3 denotes an inner plug attached to seal the mouth of the hot water storage container 2. Reference numeral 4 denotes an upper lid constituting the main body 1, which is configured to be openable and closable. Reference numeral 5 denotes a check valve, one end of which communicates with the atmosphere, and the other end of which passes through the inner stopper 3 and communicates with the inside of the container 2. Reference numeral 6 denotes a motor provided at the bottom between the main body 1 and the hot water storage container 2. Reference numeral 7 denotes a pump driven by a motor 6. The suction port 8 communicates with the bottom of the container 2, and the discharge port 9 is connected to a pipe 10. Reference numeral 12 denotes a switching valve, in which the water pumped by the operation of the pump 7 follows a circulation path returning from the circulation pipe 14 to the hot water storage container 2 again, or water is supplied from the hot water supply port 13 of the main body 1 to a cup or the like. Decide if you want to follow the route. This hot water storage container 2, pump 7,
The pipe 10, the switching valve 12, and the circulation pipe 14 constitute a circulation path. In this embodiment, a filter 11 packed with an inorganic ion exchange material is disposed in the circulation path to remove transition metal ions such as iron and manganese in water. Reference numeral 15 denotes a heater, which is mounted on the lower side surface of the hot water storage container 2. Reference numeral 16 denotes a start switch and a variable resistor for driving the motor 6, which are operated via the rod 18 by the pressing operation of the push button 17. 19 is a compression spring
The spring 19 always urges the rod 18 to be pushed upward. Reference numeral 20 denotes a switching valve switch for operating the switching valve 12. By operating the switching valve switch 20, the water path can be freely switched between the circulation path side and the hot water supply path side. 21 is a temperature detector.

Hereinafter, the operation of this embodiment will be described. When power is supplied to the hot water supply device, the heater 14 is heated, and the water temperature in the hot water storage container 2 rises. The water temperature in the hot water storage container 2 is detected by the temperature detector 20,
When the water temperature reaches the set temperature, the motor 6 is energized and the pump 7 operates. In this case, the hot water in the container 2 is repeatedly circulated by keeping the switching valve 12 open on the circulation path side. Each time the water is recirculated, the hot water in the jar pot passes through a filter 11 packed with an inorganic ion material. For this reason, according to the present embodiment, it is possible to more effectively remove transition metal ions such as iron and manganese in hot water than when filtering is performed only once. In this case, some circulation noise is generated with the circulation of the hot water, but this circulation noise is eliminated by the boiling sound when the water temperature is set to about 80 ° C., for example. That is, by setting the set temperature near the boiling point of water, the circulation sound of hot water can be eliminated.

Next, the results of using the apparatus of this embodiment will be described below. In this experiment, the removal rate of iron ions and the color of tea when tea was actually added were examined for each inorganic ion exchange material used, and a sensory test was further performed. The evaluation criteria for the sensory test were as follows: ◎ for those with very good taste and aroma of tea, ○ for those with excellent taste, △ for those with a little inferior taste and aroma, and × for those with poor taste and aroma that are not suitable for beverages. And The measurement of the effect of removing iron ions was performed as follows. First, as a standard test solution, a ferrous chloride having an iron ion concentration of 1 ppm, 0.5 ppm, and 0.1 ppm was prepared.
Measure using an atomic absorption spectrophotometer and create a calibration curve. Next, the water of the sample is passed through an inorganic ion exchange material, and the concentration of iron ions in the water is similarly measured using an atomic absorption spectrophotometer, and the value is determined using the above calibration curve. In addition, the evaluation of the color of the tea and the sensory test were performed after soaking 3 g of the tea in 200 cc of hot water that had passed through the inorganic ion exchange material for 2 minutes as described above. Particle size φ2-3m as inorganic ion exchange material
m of 10 g was filled into a filter container having a diameter of 2 cm and used. The flow rate of the pump was 50 to 2000 ml / min.
In addition, the overall evaluation was indicated by ◎ for very good, ○ for good, △ for normal, and x for bad.

 The results are shown below.

In Table 1, A is pyrophyllite, B is talc, C
Is kaolinite, D is antigorite, E is amesite, and F is fused silica.

As is clear from Table 1, in each ion-exchange material, the iron ion-removing effect is high, the hot water is circulated in the water heater, and the iron ion is almost completely removed by repeatedly passing through the inorganic ion-exchange material filter. It seems to have been. In addition, the color and taste of the tea produced thereby are more favorable. In addition, layered clay minerals such as montmorillonite, beidellite, vermulite, illite, and chamosite, or zeolites such as sodium-type and potassium-type are also effective in removing iron ions, and inorganic ion-exchange materials Can be used as Since these inorganic ion exchange materials have better heat resistance than organic ion exchange materials, the amount of impurities released into water is extremely small. Also, since it has excellent moldability, it is very suitable for use as an ion exchange material in such a hot water supply apparatus.

As a comparison, F shows data of fused silica having no ion exchange ability. However, no effect of removing iron ions was observed, and the color and taste of the tea produced thereby were poor. In addition, iron ions are ion-exchanged,
It was confirmed using an atomic absorption spectrophotometer that sodium ions and potassium ions of an equivalent amount were eluted in water and that sodium ions and potassium ions of an atomic absorption were eluted.

Effects of the Invention As is clear from the above embodiments, a hot water storage container having a heater, a hot water storage container, a pump for pumping water in the container, and a main body having a circulation path for circulating the pumped water, And a hot water supply device having an inorganic ion exchange material attached in the circulation path, so that the effect of removing transition metal ions such as iron and manganese in tap water can be realized more reliably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a water heater showing an embodiment of the present invention. 1 ... body, 2 ... hot water storage container, 7 ... pump, 11 ...
Inorganic ion-exchange material, 12… switching valve, 13… hot water supply,
14… circulation pipe, 15… heater.

Claims (1)

(57) [Claims] 1. A hot-water storage container having a heater, a pump driven by a motor for pumping liquid in the hot-water storage container, and a main body having a circulation path for circulating the pumped liquid, the circulation path comprising: A hot water supply device in which an inorganic ion exchange material is attached, and the liquid is repeatedly circulated through the circulation path by the pump.