JP3148909B2 - Electric water heater - Google Patents

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 which heats and keeps a liquid contained therein and guides it to the outside of the body by an electric pump.

[0002]

2. Description of the Related Art Since tap water in recent years has been disinfected, it contains a lot of free chlorine and has a lot of chlorine odor (chlorine odor). Therefore, in a conventional electric water heater, a device that keeps boiling for several minutes or an activated carbon is arranged to release or separate free chlorine, trihalomethane and musty odor in water into the atmosphere, thereby removing unnecessary components from tap water.

[0003]

However, in an area where high hardness water is used, scale is generated in the water heater, and the scale adheres to the hot water storage container and deteriorates heat conduction. In addition, water containing a lot of iron is supplied from tap water using aging pipes, which not only impairs the flavor of the hot water, but also when tea is added, the iron becomes tannin of the tea. And the taste of tea is spoiled. As described above, the above-described conventional electric water heater cannot remove turbid components such as scale and dissolved substances such as iron contained in the hot water. In addition, simply arranging a hollow fiber membrane filter made of cellulose acetate, polyamide, polysulfone, or the like in an electric water heater could not secure sufficient water flow through the hollow fiber membrane due to gas coming out of water during water heating. Unnecessary materials cannot be removed.

An object of the present invention is to solve such a problem of the conventional electric water heater and to provide an electric water heater which can easily remove scale components and iron.

[0005]

In order to solve the above-mentioned problems, the present invention provides a hot water storage container, a heater for heating water in the hot water storage container, and a circulation path for circulating water in the hot water storage container. the filter device having a pump and heat resistance of the hollow fiber membrane into the circulation path is provided, it is in the filter device of the water
The inflow chamber and the outflow chamber are stacked, and the inflow chamber is located above the outflow chamber.
At the top of the inflow chamber, a heat-resistant air bleeding mechanism communicating with the hot water storage container is provided, and the hollow fiber membrane is provided.
A constant vortex in the flow of water in the inflow chamber of the filter device
This is a configuration of an electric water heater to be generated .

[0006]

When the water in the hot water storage container is heated, scale components such as calcium in the water precipitate and precipitate.

Further, when the temperature of the water becomes high, the pH of the water rises because carbon dioxide dissolved in the water escapes into the atmosphere. pH
When it rises, the iron dissolved in the water precipitates.

[0008] By passing the water containing scale and iron through a heat-resistant hollow fiber membrane having a filter function, the water and scale and iron in the water are removed and the water is purified. Bubbles coming out of the water adhere to the surface of the fiber of the hollow fiber membrane, and the water permeability of the hollow fiber membrane cannot be secured.

On the premise of the above, according to the present invention, an inflow chamber and an outflow chamber of water are stacked in a filter device .
The inflow chamber is located above the outflow chamber, and an air vent mechanism is provided above the inflow chamber to communicate with the container. In addition, water accumulation in the filter device can be secured by eliminating accumulation in the inflow chamber, and turbid components such as scale in hot water and iron can be efficiently removed by the filter. And excellent never leaks to hot water vessel body and an external safety since communicated defective when even containers such tearing of the film of air vent mechanism, the flow of water into the inlet chamber of the upper filter unit By generating a constant vortex, the temperature of the water in the water heater rises and the bubbles attached to the fiber surface of the hollow fiber membrane having a filter function are removed by the vortex to improve the water permeability of the hollow fiber membrane. Turbid components such as scale and iron can be more efficiently removed with a filter.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a main body, 2 denotes a bottomed cylindrical hot water storage container having a built-in heater 3, 4 denotes a lid body that opens and closes an opening of the hot water storage container 2, and 5 denotes one for storing hot water. The other is connected to the container 2, the other is a lead-out path open to the outside, and 6 is a first pump for lead-out, which is provided in the middle of the lead-out path 5. 7 is a second pump for circulation, and 8 is a filter device, which is arranged between the inflow channel 9 and the outflow channel 10. 11 is the inflow channel 9
And an outflow channel 10, an air vent channel 12,
Reference numeral 3 denotes an inflow chamber formed at an upper portion in the filter device 8, which communicates with an outflow chamber 14 formed at a lower portion in the filter device 8. Reference numeral 15 denotes a hollow fiber membrane made of polysulfone or the like.
, A filter case made of polysulfone or the like constituting the filter device 8, a potting material 17 made of epoxy or the like for fixing the hollow fiber membrane 16 to the filter case 15, an activated carbon layer 18 supported by a mesh material or the like,
Is an air vent material made of porous fluororesin as a film of an air vent mechanism, 20 is an inlet of the filter device 8, 21 is an outlet of the filter device 8, 22 is an air vent, and the filter device 8 is an inlet 20. Inflow chamber 1 with
3 and an outflow chamber 14 having an outflow port 21 are vertically stacked, the inflow chamber 13 is located above, and the hollow fiber membrane 16 and the activated carbon layer 18 are incorporated between the inflow chamber 13 and the outflow chamber 14. . An air vent 19 is provided above the inflow chamber 13,
It is configured to communicate with the air vent 22. The inflow port 20, the outflow port 21, and the air vent port 22 communicate with a circulation path 11 including an inflow path 9 and an outflow path 10, respectively. Reference numeral 23 denotes a cover, and the filter device 8 is configured to be easily detachable from the main body 1 by opening the cover 23. 24 is a tapping knob, 25 is a control circuit, and 26 is a sensor for detecting hot water temperature.

The operation of the electric water heater having the above configuration will be described. First, the hot water is boiled by the heater 3 controlled by the control circuit 25, and the first pump 6 is driven by operating the tapping knob 24 to draw out the hot water from the outlet passage 5 to the outside. Also,
In association with the hot water temperature detected by the sensor 26, the second pump 7 is driven to circulate the hot water during the water heating process. At this time, the hot water circulates from the inflow passage 9 through the filter device 8 to the outflow passage 10 to the hot water storage container 2.

When the water in the hot water storage container 2 is heated, scale components such as calcium in the water precipitate and precipitate. Also,
When the temperature of the water rises, the pH of the water rises because the carbon dioxide dissolved in the water escapes into the atmosphere. When the pH of the water rises, the iron dissolved in the water precipitates and becomes particulate.

The water containing the scale components and the iron content is removed by passing the water containing the scale components and the iron content through the filter device 8 to remove the scale components and the iron content from the water. This causes a state where the water permeability of the hollow fiber membrane 16 having a filter function cannot be ensured by the generated bubbles.

Then, the air bubbles generated in the filter device 8 are collected at the upper part of the inflow chamber 13, and the air bubbles pass through the air vent port 22 through the hydrophobic air vent material 19 which allows air to pass through but not hot water. Hot water storage container 2 through 12
The water can be led out of the hollow fiber membrane 16 and water permeability of the hollow fiber membrane 16 can be ensured, and turbid components such as scale in the hot water and iron can be efficiently removed easily with a filter to provide delicious hot water.

In FIGS. 1 and 2, the hollow fiber membrane 16 is made of polysulfone having high heat resistance, so that it can be used without any problem in durability even with hot water at 100 ° C.

Next, FIG. 1 in basic configuration to the, in FIG. 2, section A-A, the inflow chamber as shown in cross-section B-B 13
As shown in the figure, the position of the hot water inlet 20 for the hot water is provided on the outer peripheral wall side, so that a vortex in a certain direction is generated in the inflow chamber 13 by the hot water inflow speed, and the bubbles attached to the surface of the hollow fiber membrane 16 are swirled. To ensure the water permeability of the hollow fiber membrane 16 and to efficiently remove turbid components such as scale and iron in the hot water by the filter device 8 to provide delicious hot water.

Next, in FIG. 3, in the process of circulating water through the hollow fiber membrane 16 to the filter device 8, the control circuit 25 turns on the power supply to the second circulation pump 7 in relation to the water temperature. This is performed repeatedly by turning off. By repeating the energization on / off, the flow in the inflow chamber 13 of the filter device 8 is changed, air bubbles attached to the surface of the hollow fiber membrane 16 are easily released, and water permeability is ensured. Turbid components and iron can be more efficiently removed by the filter device 8 to provide delicious hot water.

[0018]

According to the present invention, an inflow chamber and an outflow portion of water are laminated in a filter device having a heat-resistant hollow fiber membrane functioning as a filter provided in the middle of a circulation path.
By placing the inflow chamber above the outflow chamber and providing a heat-resistant air bleeding mechanism in communication with the hot water storage container at the top of the inflow chamber, air bubbles adhering to the surface of the hollow fiber membrane as a filter are removed. It is easy to remove, improves the water permeability of the hollow fiber membrane, easily removes turbid components such as scale in hot water and iron easily with a filter efficiently, and furthermore, the water inflow chamber of the filter device having the hollow fiber membrane By generating a constant vortex in the flow, the generated bubbles in the water are efficiently removed, the water permeability of the hollow fiber membrane is improved, and turbid components such as scale in the hot water and iron are easily removed with a filter. is there. In addition, in the process of circulating water to the filter device having a hollow fiber membrane, the energization of the circulating pump is repeatedly turned on and off in relation to the water temperature, thereby more efficiently removing bubbles generated in the water. It improves the water permeability of the hollow fiber membrane and easily removes turbid components such as scale in the hot water and iron components by a filter.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electric water heater according to an embodiment of the present invention.

2A is a plan sectional view of the filter device, and FIG. 2B is a longitudinal sectional view of the filter device.

FIG. 3 is a graph showing a relationship between a rise in water temperature and a water flow index when water is passed through a filter according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Hot water storage container 3 Heater 6 First pump 7 Second pump 8 Filter device 9 Inflow path 10 Outflow path 11 Circulation path 12 Air vent path 13 Inflow chamber 14 Outflow chamber 16 Hollow fiber membrane 19 Air vent material 20 Flow Inlet 21 Outlet 22 Air vent

Continuation of the front page (56) References JP-A-5-146357 (JP, A) JP-A-4-10824 (JP, U) JP-A-63-177690 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) A47J 27/21 101

Claims (1)

(57) [Claims] 1. A hot water storage container, a heater for heating water in the hot water storage container, a circulation path for circulating the water in the hot water storage container, and a pump and a heat-resistant hollow fiber membrane in the circulation path. A filter device is installed, and water is
The inflow chamber and the outflow chamber are stacked, and the inflow chamber is located above the outflow chamber.
At the top of the inflow chamber, a heat-resistant air bleeding mechanism communicating with the hot water storage container is provided, and the hollow fiber membrane is provided.
A constant vortex in the flow of water in the inflow chamber of the filter device
Generated electric water heater.