JPS6314676B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an improved structure of a tap water purifier (hereinafter simply referred to as a water purifier), and more specifically, to an improved structure of a main body serving as a purification processing section of the water purifier. (Prior Art) The filtration layer of conventional water purifiers for purifying tap water was often made of activated carbon alone. In this water purifier, residual chlorine in tap water is completely removed by the activated carbon, so when the water purifier is stopped for a long time (closed), the water inside the device, which has no sterilizing effect, remains in the activated carbon filtration layer. Bacteria grow within the filter layer, making the water discharged within the first few minutes of use of the water purifier unsuitable for drinking. To solve this problem, attempts have been made to purify tap water by using silver-loaded activated carbon in water purifiers, but the growth of bacteria in the water that comes in contact with the silver activated carbon is inhibited. However, since the water from drains does not come into contact with the silver activated carbon, it is contaminated from the air and contains bacteria, and a large amount of bacteria can be detected in the water immediately after the tap is opened. (Problems to be Solved by the Invention) However, the present invention attempts to solve the above-mentioned conventional problems, and it is clear that normal purification treatment using activated carbon is sufficient and that bacteria are not generated when the plug is closed for a long time. To provide a silver activated carbon filtration type water purifier which does not grow and can provide drinking water free of bacteria at the initial stage of opening after being closed for a long time. (Means for Solving the Problems) Therefore, the means of the present invention for solving the above problems are as follows. That is, in the present invention, in the main body of a water purifier in which a case is filled with silver activated carbon and tap water supplied from one side of the case passes through a filter layer of silver activated carbon and is discharged from the outlet of the other side, the silver activated carbon is It is a silver-supported activated carbon that supports approximately 0.1 to 1.0% by weight of silver, and there is a channel on the outer periphery or inside of the silver activated carbon filtration layer to guide a portion of the tap water to the upper surface of the silver activated carbon filtration layer. A water retaining member having water permeability and water retaining properties, such as a water sponge material, is arranged in the water flow direction of the silver activated carbon filtration layer. The water flow rate ratio between the filtration layer and the water retaining member is preferably about 4:1 to 20:1. In addition to ordinary tap water that has been sterilized with chlorine, tap water in the present invention refers to water sourced from rivers, lakes, wells, etc. that has been subjected to chlorine-based sterilization treatment and made available for drinking. (Function) In this invention, water filtration (water purification) treatment is performed using silver activated carbon. The activated carbon part of the silver activated carbon acts as an adsorbent for chlorine and other odor components and pollutants, and the silver part of the silver activated carbon acts as an antibacterial agent for contact water. Although chlorine has been removed from the water in the silver activated carbon filtration layer when the cap is closed, bacterial growth is prevented by contact with the silver part. Since the water retaining member installed on the silver activated carbon filter layer retains water containing chlorine, the proliferation of bacteria entering the drain port side of the filter layer is prevented by the chlorine content. On the other hand, when the tap is opened, most of the tap water passes through the silver activated carbon filtration layer and is filtered, and a small portion of the tap water is sent to the filtration layer outlet via the water retention member.
Mixed with silver activated carbon mass filtered water. In other words, the silver activated carbon suppresses bacterial growth within the filtration layer, and the sterilization effect near the filtration layer outlet is maintained by partially mixing undechlorinated water from the water-permeable water retaining member into the filtered water. This is what I am trying to do. (Example) Next, an example of the present invention will be described with reference to the drawings. The water purifier 1 shown in Fig. 1 is a water purifier K faucet.
It is used by connecting to a KA etc. via a connecting conduit H, and consists of a base 2 having a water guide hole 3, and a cylindrical body that stands up on the base 2 and houses a filtration layer 9 and a water retaining member 7. It consists of a case 5 and a lid 11 attached to the upper part of the case 5 and having a drain pipe 12. 3A is a connecting portion of a connecting conduit H formed at the outer end of the water guide hole 3, and serves as a water guide opening. An annular screwing piece 4 is formed on the upper surface of the base plate 2, and a lower end portion of the case 5 is screwed into the ring-shaped screwing piece 4. 7 is a water retaining member arranged annularly along the inner peripheral surface of the case 5,
It is made of a water-permeable and water-retaining material such as a water-permeable sponge material. Reference numeral 9 denotes a cylindrical column-shaped filter layer formed by filling the inside of the annular water retaining member 7 with silver activated carbons 8 to 8. That is, the outer periphery of the filtration layer 9 is covered with the water retaining member 7, and a portion of the tap water is guided to the upper surface of the filtration layer 9 via the water retaining member 7. At the upper and lower ends of the filtration layer 9 and the water retaining member 7 that covers the filtration layer 9, there are water passing plates 6, 1 such as nets.
0 is attached. The water passage plates 6 and 10 are fixed by protruding locking pieces 5A and 5B formed on the inner surface of the case 5. The filtration layer 9 to which the water retaining member 7 is attached may be of a cartridge type for convenient replacement. Silver activated carbon 8 is obtained by the usual process of immersing activated carbon powder or granules in an aqueous silver nitrate solution, washing with water and drying, and contains about 0.05 to 1.0% by weight of silver (hereinafter simply abbreviated as %). ) is used. If the amount of silver carried is 0.05% or more, it is about the level of bacteria that is the standard for tap water.
It never exceeds 100. If it is 0.2% or more, there will be no bacterial growth, but if the amount of silver supported is too large, it is not good for drinking, so the range is about 0.05 to 1.0.
% is preferable. The drain pipe 12 of the lid 11 is for discharging filtered water, and has one end 12A in the center of the lid 11.
The other end 12B is rotatably attached and serves as a drain port.
is formed downward. In addition,
Base 2, case 5, and lid 11 in this example water purifier
Each connection part is connected in a watertight manner through a gasket (not shown). Now, when the water purifier 1 of this example is opened, tap water enters the container from the water introduction hole 3 of the base 2, enters the filter layer 9 through the water passage plate 6, rises, and is affected by the action of the silver activated carbon 8. After receiving the water, chlorine and other substances are removed and the water is made into filtered water.
On the other hand, a very small portion (very small amount) of the tap water that entered the vessel through the water inlet 3 enters the water retaining member 7 on the outer periphery of the filtration layer 9, rises inside the water retaining member 7, and is filtered at the upper part of the filtration layer 9. It is mixed with water and passes through the drain pipe 12 to the mouth part 12B.
It is discharged as purified water (filtered water) (third
(See the arrow in the figure). Since the amount of tap water that passes through the water retaining member 7 is extremely small, even if it is mixed with purified water, it has no effect on the water quality. The quantitative ratio of the filtration layer 9 made of silver activated carbon 8 and the water retaining member 7 is such that the water retaining member 7 is extremely small relative to the filtration layer 9 in a cross section perpendicular to the water flow direction. The length is approximately equal to the length in the water flow direction. When the water purifier 1 is stopped (closed), the water remaining in the container is not only affected by the antibacterial action of the silver component of the silver activated carbon 8 in the filtration layer 9, but also by the trace amount of tap water retained in the water retaining member 7. The action of the chlorine component prevents bacterial growth in the water inside the water purifier 1 while it is stopped. Next, an experimental example using the water purifier 1 of this example will be shown. Experimental example: A sponge material water retaining member made of open cells with a thickness of 10 mm is formed around the outer periphery of a filtration layer with an inner diameter of 100 mm and a length of 250 mm, and the inside is filled with 0.2% silver activated carbon. Comparison Control A The same filtration layer as in the experimental example above, filled with 0.2% silver activated carbon, but without the water retaining member. Comparison B: A water retaining member made of sponge material was formed on the same filtration layer as in the above experimental example, and the inside thereof was filled with ordinary activated carbon (activated carbon that does not support silver). For the three points mentioned above, tap water containing 0.5 ppm of residual chlorine was continuously passed at 500/h for 10 hours, then the water flow was stopped for 24 hours, and the number of bacteria in the filtered water after opening the tap was examined. The results were as shown in the table below.

[Table] In addition, in the experimental example, the residual chlorine after 1 hour treatment is
0.04ppm, 0.01ppm for comparison A, comparison B
It was 0.05ppm. The water flow ratio between the filtration layer and the water retaining member is about 9:1. In comparison control A, there was bacterial growth near the exit, and it took about 10 seconds for this to be washed away.
In Comparative Control B, the number of bacteria was small immediately after opening the bottle, but since the activated carbon itself had no sterilizing effect, a large amount of bacteria multiplied inside the bottle, and it took more than a minute for it to be washed away. Compared to these, in the case of this experimental example, sterile filtered water was continuously obtained immediately after opening the bottle. The water retaining member 7 in the above-mentioned embodiment was placed on the outer periphery of the filtration layer 9, but as in the water purifier 21 of another embodiment shown in FIGS. The water retaining member 27 for guiding the water to the upper surface portion is arranged in the direction of water flow within the filtration layer 29 so that it is approximately equal to the length of the filtration layer, and the cross section perpendicular to the water flow direction is extremely small with respect to the cross section of the filtration layer. Good too. In this case, most of the tap water introduced into the vessel passes through the filtration layer 29 of the silver activated carbon 8 and is filtered, as shown in FIG. The water rises through the water retaining member 27 and is mixed with the water treated with silver activated carbon 8 to form filtered water (see the arrow in FIG. 6). When the water purifier 21 is stopped, the antibacterial effect of the silver component and the trace amount of chlorine in the tap water contained in the water retaining member prevent the growth of bacteria in the water remaining in the purifier, as in the case of the previous embodiment. Ru. (Effects of the Invention) As explained above, in the present invention, since a water-permeable water retaining member is arranged in the silver activated carbon filtration layer, trace components such as chlorine in tap water can be removed and the water can be made suitable for drinking. When the water purifier is stopped, bacterial growth in the water inside the purifier is prevented by the antibacterial action of the silver component of the silver activated carbon filter layer and the trace amount of chlorine contained in the water retaining member. Therefore,
In the water purifier of the present invention, suitable drinking water without bacterial growth can be obtained immediately after opening the tap.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a longitudinal sectional view of the water purifier, FIG. 2 is an enlarged sectional view taken along the line shown in FIG. Figure 5 is an enlarged sectional view along the line of Figure 4;
The figure is an explanatory diagram of the operation of the main parts of the water purifier. 1, 21...(tap water) water purifier, 2...base,
3... Water guide hole, 5... Case, 7, 27... Water retaining member, 8... Silver activated carbon, 9, 29... Filtration layer, 1
1... Lid body, 12... Drain pipe.

Claims (1)

[Claims] 1. In the main body of a water purifier in which a case is filled with silver activated carbon and tap water supplied from one side of the case passes through a filtration layer of silver activated carbon and is discharged from the other outlet, the silver activated carbon contains about 0.05 to 50% of silver. It is silver-supported activated carbon with a silver loading of 1.0% by weight, and a water-permeable sponge material or the like is provided on the outer periphery or inside of the silver activated carbon filtration layer to guide a portion of the tap water to the upper surface of the silver activated carbon filtration layer. A main body structure of a tap water purifier, characterized in that a water retaining member that is water-based and has water retaining properties is arranged in the water flow direction of a silver activated carbon filtration layer.