CN2365199Y

CN2365199Y - Domestic electrolytic water purifier

Info

Publication number: CN2365199Y
Application number: CN 99235171
Authority: CN
Inventors: 裴小勤
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-01-14
Filing date: 1999-01-14
Publication date: 2000-02-23
Anticipated expiration: 2009-01-14

Abstract

The utility model discloses a domestic electrolytic water purifier, which comprises an outer shell and a base, wherein, a filter element is arranged in sealed space formed by the surrounding of the outer shell and the base; the filter element divides the sealed space which is formed by the surrounding of the outer shell and the base into an inner layer part and an outer layer part; the base surface of an inner cavity of the filter element is provided with a water inlet, and a plate net anode tightly sticks to the water inlet; the place with certain distance away from the anode is provided with a plate net cathod; the space between the outer shell and the filter element is connected with a water outlet pipe. The domestic electrolytic water purifier can carry out deep purification to tap water, and meanwhile, the domestic electrolytic water purifier has the advantages of simple structure and low cost.

Description

Household electrolytic water purifier

The utility model relates to a drinking water purification device.

The quality of the urban tap water resident water terminal is often out of standard due to factors such as pollution of water sources, untight control of production processes of water plants, obsolescence of water supply networks, pollution of secondary water supplyfacilities of water storage tanks and the like. In addition, the chlorination disinfection process commonly used in water plants at present often generates carcinogenic halohydrocarbon in effluent, and heavy metals harmful to human bodies are not listed in the control of tap water production process. Therefore, the tap water user terminal is provided with the secondary deep purification device, so that the health of people is protected, and the quality of life is improved.

In order to filter out bacteria in tap water, the existing water purifier mostly adopts 0.2 micron ultrafiltration membrane hollow fibers, and the bacteria are intercepted in a water inlet area by adopting a physical isolation method. However, since the bacteria are not killed but are gathered and propagated on the filter membrane, a large amount of metabolites of the bacteria can enter the purified water through the ultrafiltration membrane to pollute the purified water, thereby harming the health of drinkers. In addition, the ultrafiltration membrane does not have the function of removing organic matters (such as carcinogenic trichloromethane) and heavy metal ions, although the chemical substances can be removed by adopting activated carbon adsorption, the activated carbon has a limited service life and can be saturated after reaching a certain adsorption amount, and harmful substances can be released even if the activated carbon is not replaced in time. In addition, the activated carbon can become a hotbed for breeding bacteria and can also cause the content of nitrite (with carcinogenicity) in water to increase.

Conventionally, methods for killing microorganisms such as bacteria in water by water electrolysis have been proposed, but since complicated electrochemical reaction processes in the water electrolysis process cannot be accurately grasped, none of the designed electrolytic water purifiers can completely kill microorganisms such as bacteria in tap water. Experiments prove that the sterilization rate of the electrolytic water purifiers is below 70 percent, so that even if the total number of bacteria of tap water reaches the requirement of GB5749-85 'sanitary Standard for Drinking Water' which is less than or equal to 100cfu/ml, 30cfu/ml still exist after treatment, and the total number still exceeds 20cfu/ml required by direct drinking water. The hygienic indexes of the tap water terminal are often out of standard, for example, the total number of the discharged water bacteria is often more than 300cfu/ml under the condition that a water storage tank is arranged.

In some of the conventional electrolytic water sterilizing water purifiers, it is considered that atomic oxygen [ O]is generated in the anodic oxygen evolution process and further the sterilization is performed by strong oxidation of atomic oxygen, but actually the anodic oxygen evolution process is

It can be seen that only atomic oxygen adsorbed on the electrode surface is present and does not enter the water, so that only the portion of bacteria that reaches the electrode surface is killed, and the bacteria in the water cannot be completely killed. Some think that the electric field between the electrodes can kill bacteria, but because the electrolyzed water generally adopts a low voltage of tens of volts, and the bacteria are only a few tenths of microns in size, the voltage distributed on each bacteria will be only in the order of tens of millivolts, which is only equivalent to the biological cell stimulating electric field, so it is unlikely that such an electric field is used to kill bacteria (unless a high voltage electrostatic mode is adopted).

It is well known that hydrogen peroxide is a strong oxidant and is easily decomposed into oxygen and water, and is commonly used for sterilization. In recent years, hydrogen peroxide is also widely used for sterilization before packaging of paper-plastic aseptic packaging boxes for packaging beverages and foods. Hydrogen peroxide has also been used abroad for disinfection and organic removal in waterworks treatment processes. While oxygen gas generates hydrogen peroxide (H) in the process of electrolytic cathode reduction₂O₂) Intermediate product (2):

and when oxygen is reduced on the disc electrode by adopting a rotating ring disc electrode test, hydrogen peroxide thrown out due to the rotation of the disc electrode can be detected on the surrounding ring electrode (the throwing-out rate of the intermediate product hydrogen peroxide can be estimated to be up to 20 percent according to the ratio of the oxygen reduction current on the disc to the hydrogen peroxide oxidation current on the ring).

According to the principle, oxygen separated out at the anode by water electrolysis can be brought to the cathode through water flow for reduction, partial intermediate product hydrogen peroxide of the oxygen reduction reaction on the cathode is brought into water by utilizing the scouring action of the water flow to kill microbes such as bacteria and the like in the water, organic matters in the water are subjected to oxidative decomposition by utilizing anodic oxidation, and heavy metal ions in the water are removed by utilizing cathodic reduction, so that the deeply purified high-quality direct drinking water is obtained. In addition, the existing water purifier often does not have a backflushing function, the filter element is easy to block, and pollution of a water purification area can be caused by backflushing by utilizing tap water to flow backwards, so that the problem to be solved is how to wash the filter element by utilizing the reverse flow of purified water.

The utility model aims at: the household electrolytic water purifier can deeply purify tap water, can be mounted at a user terminal, ensures the sanitary quality of drinking water, and has the advantages of simple structure, low cost and convenient popularization.

The technical scheme of the utility model as follows: a household electrolytic water purifier comprises a shell and a base, wherein the open end of the shell is hermetically connected with the base; the filter element is characterized in that a sealed space enclosed by the shell and the base is internally provided with the filter element, and the sealed space enclosed by the shell and the base is divided into an inner layer and an outer layer by the filter element; a water inlet is arranged on the surface of the base of the inner cavity of the filter element, a plate mesh anode is tightly attached to the water inlet, and a plate mesh cathode is arranged at a certain distance from the anode; and a water outlet pipe is connected in the space between the shell and the filter element.

Tap water firstly reaches the electrolytic anode through the water inlet pipe, and oxygen evolution reaction and oxidative decomposition reaction of organic impurities in the water are carried out on the water. The water flow carries oxygen to the electrolytic cathode, and hydrogen evolution reaction, oxygen reduction reaction and reduction reaction of heavy metal ions in water are carried out on the water flow. The washing action of the water flow on the cathode brings the intermediate product hydrogen peroxide of the oxygen reduction reaction into water to disinfect and inactivate microorganisms such as bacteria, viruses and the like in the water. Then, the water enters the inner cavity of the filter element, turbid substances in the water such as silt, rust, algae and hydrogen peroxide are filtered by the filter element to form oxides with heavy metal ions in the water, alkalified water scale is formed at the cathode, and purified water enters the shell and flows out of the water outlet pipe through the opened water outlet valve.

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic diagram of a typical embodiment of a household electrolytic water purifier;

FIG. 2 is a schematic view of the water purification process of the household electrolytic water purifier.

The water purifier of the utility model shown in fig. 1 comprises a shell 1 and a base 7, wherein the open end of the shell 1 is hermetically connected with the base 7; a filter element 2 is arranged in a sealed space enclosed by the shell 1 and the base 7, and the sealed space enclosed by the shell 1 and the base 7 is divided into an inner layer and an outer layer by the filter element 2; a water inlet 5 is arranged on the surface of a base of an inner cavity of the filter element 2, a plate-net anode 6 is tightly attached to the water inlet 5, a piece of insulating net 4 is padded on the anode 6, and a plate-net cathode 3 is arranged on the insulating net 4; a water outlet pipe 13 with a water outlet valve 12 is connected with the space between the shell 1 and the filter element 2.

In this embodiment, the water inlet 5 is connected to the water inlet pipe 10and the water outlet pipe 9 through the three-way valve 11. A power supply control box 8 is also arranged in the base 7, and two output ends of the power supply control box 8 are respectively connected with the electrolysis cathode 3 and the electrolysis anode 6.

In this embodiment, the filter element 2 is a 1 μm-grade sintered fine filter element, the anode 6 is a platinized titanium anode, and the cathode 3 is a stainless steel cathode.

The housing 1 of the water purifier of the utility model is preferably made of transparent plastic, and the base 7 is made of plastic.

Fig. 2 shows the water purification process of the water purifier of the present invention. Tap water first reaches the electrolysis anode 6 through the three-way valve 11, and oxygen evolution reaction and oxidative decomposition reaction of organic impurities in the water are carried out on the water. The water flow carries oxygen to the electrolysis cathode 3, on which hydrogen evolution reaction, oxygen reduction reaction and reduction reaction of heavy metal ions in water occur. Due to the scouring action of the water flow on the cathode 3, the intermediate product hydrogen peroxide of the oxygen reduction reaction is partially brought into the water to disinfect and inactivate microorganisms such as bacteria, viruses and the like in the water. Then, the water enters the inner cavity of the filter element 2, turbid substances in the water, such as silt, rust, algae and hydrogen peroxide, are filtered by the filter element 2 to form oxides with heavy metal ions in the water, the cathode 3 forms alkalized scale, and the purified water enters the shell 1 and flows out of the water outlet pipe 13 through the opened water outlet valve 12.

At the same time, the commercial power enters the power supply control box 8, is reduced to below 36V safe voltage through the transformer, is convertedinto a direct current constant current power supply through a circuit and is respectively added on the electrolytic anode 6 and the electrolytic cathode 3, the three-way valve 11 triggers the power supply to be opened when in a water inlet state, and the electrolytic current with the average value constant between 0.1 and 1A is output to the electrolytic electrode so as to ensure that tap water with different hardness (which determines the resistivity of the tap water) obtains the same disinfection and other treatment effects.

After the water purifier is used for a period of time, by-products hydrogen and oxygen generated by electrolysis can be gathered at the upper part of the shell 1 to form an air chamber, at the moment, the water outlet valve 12 is closed, the three-way valve 11 is shifted to a water inlet state, the air chamber is compressed by using the pressure of tap water, after balance, the three-way valve 11 is shifted to a water drainage state, air in the air chamber expands, and purified water is pushed to perform back flush cleaning on the filter element 2. Meanwhile, the other switch controls the reverse current to be applied to the electrolysis electrode so as to dissolve out the scale and heavy metals deposited on the electrolysis cathode 3, and the scale and heavy metals are discharged from the water discharge pipe 9 through the three-way valve 11 along with the back flush sewage.

The utility model adopts the electrolytic disinfection process that the inlet water firstly passes through the electrolytic anode and then reaches and washes the cathode to bring out the hydrogen peroxide, thus only sintering filter elements are needed without adopting ultrafiltration membrane hollow fiber filter elements, thereby greatly reducing the cost of the filter elements and prolonging the replacement period of the filter elements; tap water completely passes through the electrolytic electrode, so that the effects of disinfection, sterilization, removal of heavy metal ions and decomposition of organic matters are ensured; constant electrolytic current is applied to the electrolytic electrode, so that the same treatment effect on tap water with different hardness is ensured; the filter element is cleaned by back flushing purified water, and the pollution to a water purification surface in the filter element cleaning process is avoided.

Claims

1. A household electrolytic water purifier comprises a shell (1) and a base (7), wherein the open end of the shell (1) is hermetically connected with the base (7); the filter is characterized in that a filter element (2) is arranged in a sealed space defined by the shell (1) and the base (7), and the sealed space defined by the shell (1) and the base (7) is divided into an inner layer and an outer layer by the filter element (2); a water inlet (5) is arranged on the surface of the base of the inner cavity of the filter element (2), a plate mesh anode (6) is tightly attached to the water inlet (5), and a plate mesh cathode (3) is arranged at a certain distance from the anode (6); a water outlet pipe (13) is connected with the space between the shell (1) and the filter element (2).

2. Water purifier according to claim 1, characterized in that a piece of insulating net (4) is provided between the anode (6) and the cathode (3).

3. The water purifier according to claim 1, wherein an outlet valve (12) is provided on the outlet pipe (13).

4. The water purifier according to claim 1, wherein the water inlet (5) is connected to the water inlet pipe (10) and the water outlet pipe (9) by a three-way valve (11), respectively.

5. The water purifier according to claim 1, characterized in that a power supply control box (8) is arranged in the base (7), and two output ends of the power supply control box (8) are respectively connected with the electrolytic cathode (3) and the electrolytic anode (6).

6. The water purifier according to claim 1, characterized in that: the shell (1) is made of transparent plastic, and the base (7) is made of plastic.

7. The water purifier according to claim 1, characterized in that: the filter element (2) is a 1 mu m-grade sintered fine filtration filter element.

8. The water purifier according to claim 1, characterized in that: the anode (6) is a platinized titanium anode.

9. The water purifier according to claim 1, characterized in that: the cathode (3) is a stainless steel cathode.