JP4454330B2 - Water sterilizer - Google Patents

Description

  The present invention relates to a water sterilizer that sterilizes water such as drinking water with ultraviolet rays, and more particularly to a water sterilizer that is directly connected to a flowing water pipe such as a water pipe for sterilization. .

  Although tap water is sterilized with chlorine, depending on the use situation, bacterial contamination of tap water may be a problem. For example, in a special nursing home for the elderly, if a dietary patient, etc., puts foreign matter into a water tap and the bacteria pipe contaminates the water pipe, Pseudomonas aeruginosa, etc. propagates and forms a biofilm, The concentration cannot be sterilized, and bacteria may be detected from tap water. In dental clinics, bacterial back-contamination from the cooling water of dental turbines has become a problem. Furthermore, in villas and other places, the chlorine in the tap water that has been used for a short period of time disappears, and a lot of bacteria grow in the water pipe. Bacteria that inhabit the iron pipe rust humps could not be destroyed. Similar problems occur in other facilities that may not use tap water for extended periods of time.

In sterilization of tap water in the above case, a sterilizer using an ultraviolet germicidal lamp is generally used. However, in the case of a sterilization apparatus using an ultraviolet germicidal lamp, the apparatus is generally large, and it is difficult to use it in a place where there is no special space such as a home or a business office. In view of this, the above-described apparatus has been reduced in size, and for example, a flowing water type and an installation type water sterilization apparatus installed in a water faucet, a pump discharge pipe, and the like have been studied. In the case of such a small water sterilizer, simply flowing water in parallel with the ultraviolet rays causes a short time for the running water to be irradiated with ultraviolet rays, and sufficient sterilization is not performed. Therefore, a device for earning ultraviolet irradiation time has been devised. For example, Patent Document 1 discloses that a cylindrical sterilization container having a built-in ultraviolet germicidal lamp and a projection line with respect to a cross section perpendicular to the axis of the sterilization container of the suction pipe and the discharge pipe are both cut along a circle centered on the axis. And each center line and a line parallel to the axis are attached so as to intersect with each other at an obtuse angle, or a spiral guide plate is attached to the inner surface of the sterilization container, The technique which earns the ultraviolet irradiation time of flowing water by flowing flowing water spirally is disclosed.
Japanese Patent Laid-Open No. 10-272460

  However, among the techniques disclosed in Patent Document 1 above, the projection lines for the cross section of the suction pipe and the discharge pipe perpendicular to the axis of the sterilization container are both circular cut lines centered on the axis, and the respective center lines In the technique of mounting so that the line parallel to the axis intersects at an obtuse angle, the mounting position of the inflow pipe and the discharge pipe must be a predetermined position of the sterilization container, and the installation place is limited. On the other hand, in the technique disclosed in this document for attaching a spiral guide plate to the inner surface of a sterilization container, complicated processing is required on the entire inside of the container, and there are technical and economic problems. Furthermore, in the above technology, water pressure may be applied to the sterilizer twice to three times the water pressure due to the so-called water hammer phenomenon caused by water impact, especially when the well water pipe or the direct pressure pipe of the second floor or more is used. There was a problem that the UV lamp mounting part was damaged or water leaked.

  In addition, in the conventional ultraviolet sterilizing device sterilizing apparatus, including the above-described technology, a household sterilizing apparatus is premised on an installation type sterilizing apparatus that allows water discharged from a tap or the like to flow into the sterilizing apparatus. For this reason, it has been difficult to use a conventional sterilizer directly connected to a water pipe. Specifically, when the conventional type is directly connected to a water pipe, it is necessary to replace the ultraviolet germicidal lamp after the water tap is turned off. There was a problem that the germicidal lamp could not be replaced. In particular, when the sterilization apparatus is a horizontal installation type, bubbles generated by ultraviolet irradiation remain inside, and there is a problem that the bubbles reduce the sterilization efficiency.

  An object of the present invention is to provide an economical water sterilizer using ultraviolet rays without requiring a wide installation place even when used for home use or the like in order to solve the above-mentioned problems.

  As a result of intensive studies, the present inventors have solved the above-described problems using the following means.

  That is, the present invention includes at least a substantially cylindrical casing having an inflow port through which water flows into the lower bottom portion and having an outflow port of water above the side surface portion, and a lid portion for closing the upper bottom portion of the casing. In the center of the lid portion, a lid portion provided with a cylindrical tube made of an ultraviolet transmitting material extending downward in the casing axis and closed at the bottom, and an ultraviolet germicidal lamp installed in the cylindrical tube of the lid portion It is an invention of a water sterilizer configured and having a swirl plate that swirls the water flow at the inlet of the housing.

  Further, the swivel plate of the water sterilizer specifically has a plurality of substantially circular or elliptical inflow holes, and the inflow holes are inclined in the oblique direction of the housing axis, and the respective outflow holes It is preferable that all of the inclinations have the same angle. Further, the inclination angle θ of each inflow hole is 15 to 80 degrees from the casing axial direction, and the outflow hole of the surface on the surface of the swivel plate on the side in contact with the inflowing liquid in the vertical direction of the casing axis. The total area of the surface is 5 to 60% of the total area of the surface, each inflow hole of the swirl plate is present at an equidistant position from the center of the housing shaft, and the component constituting the swirl plate is nylon It is preferable that

  Moreover, it is preferable that the power consumption of the said ultraviolet germicidal lamp of the said water sterilizer is 3-20W.

  Moreover, it is preferable that the component which comprises the said housing | casing of the said water sterilizer is a metal, and a part or all of the outer surface of the side part of the said metal housing | casing is a rough surface, Moreover, the inner surface of a housing | casing Is preferably coated with titanium oxide, and has a filter made of silver or coated with silver on the inside of the casing, and in particular, the filter is installed in the inflow portion of the casing. Preferably it is.

  Moreover, it is preferable that the said cover part of the said water sterilizer is transparent or semi-transparent.

  Further, the present invention is also a method of using a water sterilizer that sterilizes tap water by connecting the water sterilizer to the water pipe at either the inlet or the outlet of the housing. is there.

  Moreover, this invention is also invention of the usage method of the water sterilizer which sterilizes water by always lighting the said ultraviolet sterilization lamp installed in the said water sterilizer.

  According to the water sterilization apparatus of the present invention, as a method of swirling water for increasing the amount of ultraviolet irradiation, an inflow port can be provided in the lower bottom of the housing by providing a swirl plate. For this reason, it can be used as a water pipe direct connection type water sterilizer which does not require a wide installation place. Further, by adopting a water pipe direct connection type, even when bubbles are generated by ultraviolet irradiation, they can be easily discharged from the outlet, and a stable ultraviolet sterilizing effect can be maintained.

  Also, a plurality of inflow holes provided in the swivel plate are provided, the shape thereof is substantially circular or substantially elliptical, and the inclination of each inflow hole is set to the same inclination angle, preferably the inclination angle θ is 15 to 80 degrees, preferably The UV sterilization of the water to be processed is possible even when a cold cathode mini UV lamp with low power consumption of 3 to 20 W is used for the UV sterilization lamp by setting the total area ratio of the outflow holes to 5 to 60% of the total area. The effect can be fully demonstrated.

  In addition, when the water sterilizer of the present invention is directly connected to a water pipe by using a cylindrical tube made of an ultraviolet transmissive substance for installing an ultraviolet germicidal lamp on the lid portion that covers the housing, Even when the UV germicidal lamp runs out, it can be replaced without shutting off the main tap.

  In addition, when each inflow hole of the swivel plate is provided at a position equidistant from the center of the housing shaft and the component constituting the swivel plate is made of nylon, it has light resistance to ultraviolet rays. It is excellent in durability and can reduce the impact caused by the water hammer phenomenon on the cylindrical tube installed at the center of the casing.

  In addition, since the inner surface of the casing is coated with titanium oxide to promote the decomposition of organic substances contained in the water to be treated, a factor of high cost that was unavoidable in the conventional water sterilizer using SUS as the casing Thus, the mirror finish inside the casing can be eliminated.

  In addition, by having a filter made of silver or coated with silver on the surface inside the casing, even if the amount of chlorine contained in tap water is reduced by ultraviolet irradiation, bacteria can propagate in the treated water. There is no. In addition, providing the filter at the inflow portion of the housing contributes to the impact mitigation due to the water hammer phenomenon.

  In addition, when the lid portion is transparent or translucent, the light emitted from the ultraviolet germicidal lamp can be observed from the transparent or translucent portion, so that it is possible to easily find out the ball of the ultraviolet germicidal lamp. it can.

  Moreover, the problem that the sterilizing ability is not sufficiently exhibited at the beginning of lighting can be solved by always lighting the ultraviolet sterilizing lamp of the water sterilizing apparatus of the present invention to sterilize water.

  Hereinafter, the water sterilizer of the present invention will be described in more detail with reference to the drawings. However, the embodiments of the present invention are not limited to the embodiments shown in the drawings. FIG. 1 is a perspective view showing the appearance of the water sterilizer of the present invention, and FIG. 2 is a vertical sectional view showing the inside of the water sterilizer of the present invention.

  The water sterilization apparatus of the present invention has a substantially cylindrical casing 1, and water flows through the casing to perform sterilization treatment. An inflow port 11 through which water flows is provided at the lower bottom of the housing 1, and an outflow port 12 through which sterilized water flows out is provided on the upper surface side of the housing 1. Since the upper bottom portion of the housing 1 is closed by the lid portion 2 by the lid portion 2, water does not leak outside the apparatus. A cylindrical tube 21 is attached to the lid 2 at the center of the lid so as to extend downward in the housing axis and close the lower bottom. An ultraviolet germicidal lamp 3 can be installed inside the cylindrical tube 21 from the top of the lid 2. That is, the water to be treated flows in from the inflow port 11, flows in contact with the inner wall surface of the housing 1 and the outer wall surface of the cylindrical tube 21, is sterilized, and flows out from the outflow port 12. There is no direct contact. In the water sterilization apparatus of the present invention, ultraviolet rays are irradiated from the ultraviolet sterilization lamp 3 to the water to be treated through the cylindrical tube 21, so that the component of the cylindrical tube 21 needs to be an ultraviolet transmissive substance. As an example of the ultraviolet light transmitting material, quartz can be given.

(Swivel plate)
The water sterilizer of the present invention has a swivel plate 4 for swirling a water flow at the inlet 11 of the housing. The swirl plate 4 can be used without limitation as long as it has a shape that imparts a swirl flow to the inflowing water. In FIG. 3, the water flow direction A of the water that has passed through the swivel plate 4 and has flowed into the housing 1 from the inlet 11 is shown.

  FIG. 4 shows a preferred specific example of the swivel plate 4. 4A is a plan view of the swivel plate 4, and FIG. 4B is a part of a vertical sectional view of the swivel unit 4. In this specific example, the swivel plate 4 has a disk shape and has six circular inflow holes 41 at positions equidistant from the center of the circle. In this embodiment, since the inflow hole does not exist in the center of the swivel plate 4, even when, for example, a water hammer phenomenon occurs, the impact is not directly transmitted to the cylindrical tube 22 of the lid portion 2. The shape of the inflow hole 41 is not necessarily circular, but is preferably substantially circular or substantially elliptical from the viewpoint of uniform water inflow. Further, the number of inflow holes 41 is not necessarily six, but a plurality of inflow holes 41 are also preferable from the viewpoint of uniform inflow of water.

  In FIG. 4A, the inflow hole 41 has a solid line indicating the position of the inflow hole 41 on the near side, and a dotted line indicating the position of the inflow hole 41 on the back side. That is, the inflow hole 41 is inclined in the oblique direction of the housing axis as shown in the vertical sectional view of FIG. As shown in FIG. 4B, the inclination angle of the inflow hole 41 from the housing axis is θ. All the outflow holes 41 are inclined at the same angle θ. For this reason, since the water to be treated can be caused to flow by generating a swirling flow when flowing into the inside of the housing 1, it is possible to earn ultraviolet irradiation time for the water to be treated. The ultraviolet irradiation time to the water to be treated is determined by the inclination angle θ and the speed of the water flow. In this case, if each inflow hole 41 is inclined at a different angle, the swirling effect is canceled in the entire running water, which is not effective. In order to ensure sufficient UV irradiation time for the water to be treated even when the water flow is maximum, the inclination angle θ of each inflow hole 41 of the swivel plate is 5 to 80 degrees from the casing axial direction. Is preferably 15 ° to 80 °, and most preferably 30 ° to 60 °. If the angle θ is too small, the ultraviolet irradiation time cannot be earned. On the other hand, when the angle θ is large, the ultraviolet irradiation time is long, which is preferable. Moreover, if ultraviolet rays of a predetermined amount or more are irradiated, the sterilizing effect does not change so much even if irradiation is performed further.

  Further, in order to generate a swirl flow, it is necessary to give a constant water flow velocity when the water flow velocity is low. For this reason, on the surface of the swivel plate 4 on the side in contact with the inflowing liquid in the direction perpendicular to the housing axis, the total area of the outflow holes 41 of the surface is 5 to 60% of the total area of the surface. The content of 10 to 30% is preferable because the amount of water flowing into the housing interior 1 can be reduced. This is because a water flow having a high speed can be obtained by reducing the amount of water passing through the swivel plate 4.

  Since the swivel plate 4 is irradiated with ultraviolet rays from the ultraviolet germicidal lamp 3, a material for the swivel plate 4 is preferably a polymer material that does not absorb light in the ultraviolet region and has ultraviolet light resistance. Specific examples of such a polymer material include nylon, Teflon (registered trademark), fluororesin, polypropylene resin, methylpentene resin, methacrylic resin, styrene resin, and styrene / acrylonitrile copolymer.

  Further, the swivel plate 4 has a role of swirling the inflowing liquid and also has a role of weakening a sudden water flow impact and preventing water leakage due to a water hammer phenomenon and damage to the mounting portion of the cylindrical tube 21 and the ultraviolet germicidal lamp 3. For this reason, the swirl plate 4 is particularly preferably a material having excellent viscosity capable of relieving water flow impact among the polymer materials. Preferable specific examples of such a polymer material include nylon and Teflon (registered trademark). As nylon, known nylons such as nylon 6, nylon 66 and nylon 55 can be used.

(UV germicidal lamp)
A known germicidal lamp can be used as the ultraviolet germicidal lamp 3 used in the water sterilizing apparatus of the present invention. However, the water sterilization apparatus of the present invention is also considered to be used by continuously lighting ultraviolet sterilization or the like. Therefore, it is preferable that the ultraviolet germicidal lamp to be used can suppress an increase in water temperature even during continuous lighting, and can suppress the running cost of electric power. For this reason, in the water sterilizer of the present invention, it is preferable to use a cold cathode mini ultraviolet lamp with low power consumption as the ultraviolet sterilizing lamp. The power consumption of such a cold cathode mini-ultraviolet lamp is preferably 3 to 20 W, and more preferably 3 to 8 W. This is because, if the structure of the water sterilization apparatus of the present invention is used, even when an ultraviolet lamp in this range is used, a sufficient sterilizing effect can be expected by optimizing the structure of the swivel plate 4.

(Casing)
The casing 1 used in the water sterilization apparatus of the present invention can be used without limitation as long as it is a component used as a water pipe such as stainless steel (SUS). However, in the water sterilization apparatus of the present invention, since the ultraviolet sterilization lamp is lit continuously and used as described above, in order to dissipate the water temperature rise due to lighting efficiently to the outside, a metal is used. It is preferable to use as a component. Further, it is preferable that a part or all of the outer surface of the side surface portion of the casing is rough because the contact area with the outside air is increased and heat is easily dissipated. The surface of the metal can be roughened by shaving the metal surface using a known method such as sandblasting.

  Further, the inside of the housing is preferably mirror-finished. This is because by performing the mirror surface processing, adhesion of organic substances is prevented, and ultraviolet rays are reflected by the mirror surface, so that the sterilization efficiency for the water to be processed can be improved.

  Alternatively, the inner surface of the housing 1 may be coated with titanium oxide. The mirror surface processing is effective for improving the sterilization efficiency, but has a high processing cost and a high cost factor. In this respect, when the inner surface of the housing 1 is coated with titanium oxide, decomposition of organic substances contained in water can be promoted, and adhesion to the inner surface of the housing can be prevented. This eliminates the need for mirror finishing of the inner surface, which is a costly factor. As an example of a method for coating titanium oxide on a casing, a mixed solution of titanium oxide using an alkyl silicate as a binder is applied by a sol-gel method, and 150 to 600 ° C. in an overheater such as an oven, preferably Examples include a method of baking on the inner surface of the housing 1 at 350 to 450 ° C., and a method of applying a mixture of titanium hydroxide and silicic acid by a sol-gel method and baking the inner surface of the housing 1 at 70 to 200 ° C. it can. However, the titanium oxide coating method of the present invention is not limited to these methods.

(Inlet, outlet)
Since the water sterilization apparatus of the present invention is intended to be directly connected to a water pipe or the like, the inlet 11 and the outlet 12 of the housing 1 connected to the water pipe or the like are those of a general gas heater. Similar to the water pipe connection, it is possible to provide a threaded portion that can be attached with a 13 mm general-purpose flexible pipe. In FIG. 1, the water pipe connection parts 61 and 62 in the case where the inlet 11 and the outlet 12 and the water pipe are connected are shown. In addition to this connection method, a 1/4 pp polyethylene tube, a 3/8 polyethylene tube, etc. that are generally available can be inserted. It is also possible to adopt a structure in which a general simple connector such as one screw can be attached. Even with such attachment alone, the pressure resistance is 30 kg or more, so it can be used as a water sterilizer. The connector can also be provided with a wrench notch for screwing the connector.

(Cover)
The lid 2 of the water sterilizer of the present invention is preferably transparent or translucent. With such a configuration, the bluish and bright light emitted from the ultraviolet germicidal lamp 3 can be observed from the outside, and the blowout of the ultraviolet germicidal lamp 3 can be confirmed. If the water sterilization device of the present invention is installed in a dim place such as under a sink, even the bright light emitted by the ultraviolet germicidal lamp 3 can be sufficiently visually observed. The components that can be used for the transparent or translucent lid 2 can be used without limitation as long as they do not elute harmful components in water. Specific examples include ABS resin, AS resin, and polypropylene resin. In addition, since the amount of ultraviolet rays radiated to the outside through the lid 2 is very weak, there is no particular problem even if it is left as it is. However, when it is desired to prevent the ultraviolet rays from being radiated to the outside, the outside of the lid 2 is absorbed by ultraviolet rays. It can be covered with a film or the like, and only visible light can be irradiated to the outside.

  A plug 22 for closing the cylindrical tube 21 can be provided on the upper portion of the lid portion 2. By attaching the stopper 22, even if the water sterilizer of the present invention is installed around the water such as the lower part of the sink, water does not enter from the outside, and the ultraviolet sterilizing lamp 3 does not get water. A conductive wire 7 for supplying electric power to the ultraviolet germicidal lamp 3 is passed through the plug 22. For this reason, the plug 22 is preferably a rubber plug that can be easily processed.

  The connection between the lid 2 and the housing 1 can be used without limitation as long as it is a connection method that does not cause water leakage from the connection part, but the connection by screwing is simple and reliable. In the case of connection by screwing, a notch part for gripping a wrench for screwing may be provided outside the lid part 2.

  When the lid 2 is not transparent or translucent, or when the bright light emitted from the ultraviolet germicidal lamp 3 is insufficient for observation from the outside even if it is transparent, the disconnection relay is connected to the ultraviolet inverter lighting unit. It is also possible to provide an out-of-ball warning system 8 in which a warning lamp is differential when a disconnection occurs. Further, the alarm system 8 can be provided with an ultraviolet lamp lighting time accumulator so that the lighting time up to that time can be discriminated, or can be provided with a function of stopping the alarm sound so as to be suitable for use in a hospital or the like. .

(filter)
The water sterilizer of the present invention is preferably provided with a filter 5 made of silver or coated with silver on the surface inside the housing 1. In sterilization with an ultraviolet germicidal lamp, when the intensity of light is increased, chlorine in tap water may be decomposed. In large facilities, after treatment with an ultraviolet germicidal lamp, chlorine is further added and used. However, when used as a sterilization lamp for domestic tap water, such work is difficult, so by performing UV sterilization, the chlorine contained will disappear, and the water after UV sterilization treatment, There was a possibility that bacteria were easy to propagate. Therefore, to compensate for this, it is preferable to add sterilization with silver ions. By using the filter 5 made of silver or coated with silver on the surface, a small amount of silver is eluted in the water to be treated, and becomes silver ions, so that water can be sterilized. Specific examples of the filter 5 include a filter in which a non-woven fiber such as a stainless net or polyethylene is coated with silver, and a filter in which silver fine wires are compressed. These filters 5 can have a non-woven structure or a mesh structure in order to increase the contact area with the water to be treated. The filter 5 made it possible to maintain the antibacterial effect of water after UV sterilization treatment. Further, by providing the filter 5 having a non-woven structure or a mesh structure at the inflow portion 11 of the housing 1, an impact mitigating effect can be synergistically produced with the swivel plate 3 and can contribute to shock absorption due to a water hammer phenomenon. it can.

(how to use)
The water sterilizer of the present invention is preferably used by being directly connected to a water pipe. FIG. 5 is an explanatory diagram of how to use the water sterilizer of the present invention, taking as an example the case where the water sterilizer is attached to the wash basin 8. As can be seen from FIG. 5, the water sterilization apparatus of the present invention does not treat the water exiting from the water faucet with the sterilization apparatus as in the conventional installation type, but either the inlet 11 or the outlet 12 of the housing 1. Momo can be used in a state where it is connected to a water pipe. For this reason, even when the installation place of a water sterilizer cannot be taken widely, the water sterilizer of this invention can be used. In order to enable such a method of use, in the installation type, the inlet is often provided on the side surface of the housing, whereas in the water sterilization apparatus of the invention, the water inlet 11 is substantially cylindrical as described above. The water is swirled by the swivel plate 4 at the lower bottom of the case 1. Moreover, in order to be able to exchange the ultraviolet germicidal lamp easily even if it is directly connected to the water pipe, the ultraviolet germicidal lamp is not immersed in the water to be directly treated, but inside the cylindrical tube 21 provided in the lid 2. Since it was decided to install it, it was possible to replace the ultraviolet germicidal lamp 3 without closing the water tap.

  Moreover, it is preferable that the water sterilizer of this invention sterilizes water by making the ultraviolet germicidal lamp 3 light continuously. The light emission principle of the ultraviolet germicidal lamp is the same as that of the mercury lamp, and it takes about 15 minutes after lighting to obtain the maximum bactericidal effect. Therefore, if the sterilizing lamp is turned on after the water to be sterilized flows, the sterilizing power is not sufficient. In order to enable continuous lighting of the germicidal lamp, the ultraviolet germicidal lamp 3 used in the present invention suppresses heat generation from the germicidal lamp using the cold cathode mini-ultraviolet lamp as described above. Heat dissipation can be improved by using metal and further roughening the outer surface of the side surface of the metal casing. In addition, by coating titanium oxide on the inner surface of the housing 1, organic substances contained in the water to be treated can be decomposed and prevented from adhering to the inner surface of the housing. Even the ultraviolet germicidal lamp 3 with a small electric power can exhibit a sufficient sterilizing power.

  Since the water sterilizer of the present invention is as described above, it can be used for any application for sterilizing water. In particular, tap water is sterilized in nursing homes, sterilization from cooling water of dental turbines, and in large buildings, public halls, ward halls, empty condominiums, hospitals, schools, kindergartens, nurseries, etc. It can be used as a device for sterilizing tap water in a facility that is not used for a long period of time and has or is likely to have bacteria growing.

It is an external appearance perspective view of the water sterilizer of this invention. It is a vertical sectional view of the water sterilizer of the present invention. In FIG. 2, it is the vertical sectional view which showed the water flow direction inside a housing | casing. 3 is a plan view of a swivel plate 4. FIG. FIG. 4 is a part of a vertical sectional view of a turning unit 4. It is use condition explanatory drawing which shows an example of the water sterilizer usage method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing | casing 11 Inlet 12 Outlet 2 Cover part 21 Cylindrical tube 22 Plug 3 Ultraviolet germicidal lamp 4 Swivel plate 41 Inflow hole 5 Filter 61 Inlet side water pipe connection part 62 Outlet side water pipe connection part 7 Conductive wire 8 Alarm System 9 Wash basin equipped with the water sterilizer of the present invention A Water flow direction in the housing

Claims (13)

A substantially cylindrical casing having an inlet for water to flow into at least the lower bottom, and having a water outlet above the side surface, and a lid for closing the upper bottom of the casing, at the center of the lid A lid portion provided with a cylindrical tube made of an ultraviolet transmitting material extending in the downward direction of the housing axis and closed at the bottom, and an ultraviolet germicidal lamp installed in the cylindrical tube of the lid portion,
The inlet of the casing, have a pivot plate to pivot the water flow,
The swivel plate has a plurality of inflow holes having a substantially circular shape or a substantially elliptic shape, the inflow holes are inclined in the oblique direction of the housing axis, and the inclinations of the outflow holes are all at the same angle. Water sterilizer. 2. The water sterilizer according to claim 1, wherein an inclination angle θ of each inflow hole of the swirl plate is 15 to 80 degrees from the casing axial direction. The total area of the outflow holes of the surface on the surface of the swivel plate on the side in contact with the inflowing liquid in the direction perpendicular to the housing axis is 5 to 60% of the total area of the surface. The water sterilizer described. The water sterilizer as described in any one of Claims 1-3 in which each inflow hole of the said turning board exists in the position equidistant from the center of the said housing shaft. The water sterilizer described in any one of Claims 1-4 whose component which comprises the said turning board is nylon. The water sterilizer according to any one of claims 1 to 5, wherein power consumption of the ultraviolet germicidal lamp is 3 to 20W. The component which comprises the said housing | casing is a metal, and a part or all of the outer surface of the side part of the said metal housing | casing is a rough surface, The water sterilizer described in any one of Claims 1-6 . The water sterilizer according to any one of claims 1 to 7, wherein an inner surface of the casing is coated with titanium oxide. The water sterilizer according to any one of claims 1 to 8, further comprising a filter made of silver or having a surface coated with silver inside the casing. The water sterilizer according to claim 9, wherein the inflow portion of the housing has the filter. The water sterilizer according to any one of claims 1 to 10, wherein the lid is transparent or translucent. The water sterilizer according to any one of claims 1 to 11, wherein the water sterilizer is connected to a water pipe at either the inlet or the outlet of the casing to sterilize tap water. How to use the device. The method of using a water sterilizer according to any one of claims 1 to 12, wherein the ultraviolet sterilization lamp installed in the water sterilizer is always lit to sterilize water.

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