JP2024062301A - Liquid Purification Equipment - Google Patents

Abstract

To provide a liquid cleaning apparatus capable of processing a large amount of liquid in a short time.SOLUTION: A liquid cleaning apparatus 1 includes a treatment tank 2 having cylindrical side walls 2a, and an inlet channel 3 and an outlet channel 4 for liquid. A plurality of cylindrical ultraviolet lamps 7 protected by protective pipes are provided inside the treatment tank 2. The plurality of ultraviolet lamps 7 have a space 2b formed near an opening of the inlet channel 3, with the four ultraviolet lamps 7 facing the inlet channel 3 being facing parts 7a, and the other parts being the array parts 7b arranged almost evenly. The facing part 7a is inclined at about 60° to an inflow direction of liquid. The liquid flowing in from the inlet channel 3 strikes the facing part 7a through the space 2b and spirals along the side wall 2a of the treatment tank 2 due to the inclination of the facing part 7a. On the other hand, a turbulent flow is generated by the liquid passing through a gap with the facing part 7a. The turbulent flow of the liquid around the ultraviolet lamp 7 efficiently purifies the liquid.SELECTED DRAWING: Figure 3

Description

The present invention relates to a liquid purification device capable of purifying large amounts of liquid.

Conventionally, in fish farming, etc., sterilization has been performed using ultraviolet purifiers when filtering water in aquaculture tanks. Patent Document 1 discloses a liquid purifier that is made of a transparent member, has an ultraviolet lamp installed in a passage formed so that liquid can flow inside, and sterilizes the liquid flowing inside the passage.

JP 2020-081990 A Japanese Patent No. 4664496

The liquid purification device described in Patent Document 1, as shown in Figure 7 of the same document, can be provided with multiple passages through which the liquid flows, and the number of passages can be increased or decreased depending on the amount of liquid to be treated, so the device can be configured to suit the size of the facility, from relatively small to medium-sized facilities.

On the other hand, when treating large volumes of liquid in large-scale facilities, a configuration with multiple ultraviolet lamps installed inside the passage, as in Patent Document 2, is suitable. The treatment device described in Patent Document 2 is arranged along the flow of the fluid, with multiple cylindrical tubular members equipped with ultraviolet lamps inside. In addition, a guide plate that creates a vortex around the tubular members is provided upstream of the liquid flow. It is said that this configuration allows ultraviolet light to be irradiated for a long period of time on the liquid passing around the tubular members.

However, in the configuration described in Patent Document 2, the guide plate acts as a resistance to the flow, slowing down the flow rate, making it difficult to sterilize a large amount of liquid in a short period of time.

The present invention aims to provide a liquid purification device that can process a large amount of liquid in a short period of time.

In order to achieve the above object, the liquid purification device of the present invention is a device that purifies a liquid by irradiating the liquid with light rays including ultraviolet rays, and is equipped with a treatment tank having a cylindrical side wall, a plurality of cylindrical light source cylinders arranged along the axial direction within the treatment tank, and an inlet channel for introducing the liquid to be purified and an outlet channel for discharging the purified liquid, which are connected from the side of the treatment tank, and are offset in the axial direction of the treatment tank, and are provided in the treatment tank or the inlet channel at a location where the liquid flowing in from the inlet channel hits, and have a facing portion arranged at an angle with respect to the flow direction of the liquid from the inlet channel when viewed from the axial direction of the treatment tank.

According to the liquid purification device of the present invention, the facing portion provided in the treatment tank or inlet channel is inclined with respect to the inflow direction of the liquid from the inlet channel when viewed from the axial direction of the treatment tank, so that the liquid flowing in from the inlet channel flows smoothly into the treatment tank. In addition, the inclination of the facing portion changes the flow direction of the flowing in liquid, and the flow swirls in an arc along the side wall of the treatment tank.

In the liquid purification device of the present invention, the facing portion may be formed by an arrangement of the light source cylinders. With this configuration, a space is formed near the opening of the inflow channel due to the inclination of the light source cylinders. This space allows the liquid flowing in from the inflow channel to flow smoothly into the treatment tank.

In addition, because the inflow and outflow paths are offset in the axial direction of the treatment tank, the offset is added to the arc-shaped swirl of the liquid, resulting in a spiral flow. This causes the liquid in the treatment tank to come into contact with the multiple light source cylinders in a spiral shape, creating turbulence around the light source cylinders, allowing for efficient purification of the liquid.

In addition, in the liquid purification device of the present invention, among the plurality of light source cylinders, a plurality of light source cylinders excluding the facing portion may be arranged in an arrangement section, and the light source cylinders in the arrangement section may be arranged such that the ranges at which ultraviolet light can be irradiated overlap each other.

According to this configuration, the multiple light source cylinders in the arrangement section are arranged so that the irradiation ranges of the light source cylinders overlap, so that the liquid between adjacent light source cylinders is irradiated with ultraviolet light from both light source cylinders. This allows for efficient purification of the liquid in the treatment tank.

According to the present invention, the liquid to be treated can be brought into contact with multiple light source cylinders installed in the treatment tank in a spiral manner, making it possible to treat a large amount of liquid in a short period of time.

FIG. 2 is an explanatory diagram showing the liquid purifying device of the embodiment as viewed from the side; 2A is a cross-sectional view of the liquid purification device of FIG. 1 taken along line II-II as viewed from the axial direction of the treatment tank, (A) being an explanatory diagram showing the opposing portion and space, and (B) being an explanatory diagram showing the irradiation range of the ultraviolet lamp. 4A and 4B are explanatory diagrams showing the flow of liquid in a treatment tank.

Next, a liquid purification device as an embodiment of the present invention will be described with reference to Figs. 1 to 3. As shown in Fig. 1, the liquid purification device 1 of this embodiment comprises a cylindrical treatment tank 2 having a cylindrical side wall 2a, and a liquid inlet channel 3 and an outlet channel 4 provided in the treatment tank 2. The liquid to be treated here is water contaminated with pathogenic E. coli or the like, and is particularly effective for seawater.

The treatment tank 2 has a lid 5 at the top and a bottom 6 at the bottom. Inside the treatment tank 2, multiple cylindrical ultraviolet lamps 7 are arranged as light source cylinders. The ultraviolet lamps 7 are arranged facing the axial direction of the treatment tank 2 (the vertical direction in FIG. 1), and each lamp is provided with a protective pipe (not shown) made of quartz glass on its outer periphery. Note that, in addition to the mercury ultraviolet lamps 7, LEDs or the like that have the function of irradiating ultraviolet light can also be used as the light source cylinders.

The ultraviolet lamp 7 is held by a protective pipe at two locations: a lid holder provided on the lid portion 5 and a bottom holder provided on the bottom portion 6 (both not shown). The ultraviolet lamp 7 is fixed to the lid holder and bottom holder via pressure-resistant packing (not shown), and is designed to prevent liquid from leaking out when water pressure is applied inside the treatment tank 2.

In this embodiment, the inlet passage 3 is connected to the side of the treatment tank 2 and is provided downward in the axial direction of the treatment tank 2. The outlet passage 4 is connected to the side wall 2a of the treatment tank 2 from the side and is provided upward in the axial direction of the treatment tank.

In this embodiment, the inflow channel 3 and the outflow channel 4 are offset in the axial direction of the treatment tank 2, as shown in FIG. 1. In this invention, offset means that the inflow channel 3 and the outflow channel 4 are installed apart in the axial direction of the treatment tank 2. The offset amount is the distance in the axial direction, and the preferred range is 40 cm to 200 cm. In addition, the inflow channel 3 and the outflow channel 4 are fixed to the treatment tank 2 so that their respective central axes intersect with the central axis of the treatment tank 2, as shown in FIG. 2.

As shown in FIG. 1, the outside of the lid 5 is protected by a protective cover 8, and the outside of the bottom 6 is protected by a pedestal 9. The treatment tank 2 and the pedestal 9 are fixed to the installation location by an installation frame 10.

Figure 2 is a cross-sectional view of line II-II in Figure 1. In this embodiment, of the multiple ultraviolet lamps 7, four ultraviolet lamps 7 that face the inflow channel 3 in the inflow direction of the liquid are formed as facing portions 7a. These facing portions 7a are formed at an inclination of approximately 60° with respect to the central axis direction, which is the inflow direction of the inflow channel 3. The facing portion 7a may be made of any material other than ultraviolet lamps, such as metal, wood, resin, ceramic, etc., as long as it has the function of generating resistance, and the cross-sectional shape may be any shape, such as a circle, polygon, ellipse, plate, etc.

The facing portion 7a of the ultraviolet lamp 7 forms a space 2b in the treatment tank 2 near the opening of the inlet 3. The shape of this space 2b is approximately trapezoidal in cross section when viewed from the axial direction of the treatment tank 2.

Except for the facing portion 7a of the ultraviolet lamp 7, the ultraviolet lamps 7 are arranged almost evenly in a concentric arrangement portion 7b. In this embodiment, the number of ultraviolet lamps 7 is 34.

As shown in FIG. 2(B), it is preferable to arrange the ultraviolet lamps 7 in the array section 7b so that the irradiable ranges 7c of the ultraviolet light irradiated around the ultraviolet lamps 7 overlap. In this embodiment, the ultraviolet light irradiable range refers to a range within a radius of 12 cm from the light source cylinder. Moreover, overlapping ultraviolet light irradiable ranges refers to a distance of 24 cm or less between adjacent light source cylinders.

The irradiation range 7c of the ultraviolet lamps 7 varies depending on the state of the liquid being treated and the output of the ultraviolet lamps 7. For this reason, in the arrangement section 7b, the number and arrangement of the ultraviolet lamps 7 are determined taking into consideration the state of the liquid being treated (transparency, degree of contamination, etc.), the output of the ultraviolet lamps 7, and the necessary processing capacity in the processing tank 2.

The angle of the facing portion 7a and the area of the space 2b in FIG. 2 can be changed as appropriate depending on the speed of the liquid flowing in from the inflow channel 3. When the liquid flows quickly, the space 2b can be made larger to allow the liquid to flow smoothly into the treatment tank 2.

As an example of an embodiment of the liquid purification device 1, the treatment tank 2 has an inner diameter of 600 mm, a height of 1200 mm, and inner diameters of the inlet 3 and outlet 4 are 250 mm. The ultraviolet lamp 7 has a protective pipe with an outer diameter of 30 mm at the point where it comes into contact with the liquid. In this embodiment, the ratio of the cross-sectional area of the treatment tank 2 to the cross-sectional area of the ultraviolet lamp 7 is approximately 8.5%.

The liquid purifying device 1 of the present embodiment is configured to have a processing capacity of 500 ^m3 /h. When performing processing at this processing capacity, the speed of the liquid flowing in from the inflow path 3 is about 10 km/h, which is a faster flow rate of the liquid compared to a normal purifying device.

When performing liquid purification processing using the liquid purification device 1 of this embodiment, liquid is supplied from an externally installed pump (not shown) via the inlet channel 3. At this time, in the preparation stage, the inside of the processing tank 2 is filled with liquid.

The flow of liquid in the treatment tank 2 is shown in Figure 3. The liquid supplied by the pump flows into the space 2b in the treatment tank 2. Since no ultraviolet lamp 7 is provided in the space 2b, the liquid flowing in from the inlet 3 hits the opposing part 7a of the ultraviolet lamp 7 at the forefront without being obstructed by the ultraviolet lamp 7.

The liquid that hits the facing portion 7a changes direction according to the inclination of the facing portion 7a relative to the inflow path 3, and swirls in an arc along the inner wall of the treatment tank 2. However, because there is a gap between each of the ultraviolet lamps 7 even in the facing portion 7a, some of the liquid that flows in passes through this gap and enters the arrangement portion 7b of the ultraviolet lamps 7.

In this embodiment, the inlet channel 3 is provided at the bottom in FIG. 1, and the outlet channel 4 is provided at the top, so the liquid flow moves upward while circling in an arc along the inner wall of the treatment tank 2. In other words, the liquid rises in a spiral upward. At the same time, the liquid that has entered the arrangement section 7b through the gap in the facing section 7a merges with the liquid flowing in a spiral, generating a turbulent flow of the liquid in the arrangement section 7b.

In this way, the liquid flowing in from the inlet 3 rises in a spiral shape in the treatment tank 2 and is stirred by the turbulent flow, sterilized and purified by the irradiation of light, including ultraviolet rays, from the ultraviolet lamp 7, and then flows out to the outside from the outlet 4.

In the liquid purification device 1 of this embodiment, a space 2b is formed near the opening of the inflow channel 3, so that a decrease in the speed of the liquid flowing in from the inflow channel 3 can be prevented. Therefore, compared to when the ultraviolet lamps 7 are evenly arranged in the treatment tank 2, the inflow speed of the liquid can be increased, and a spiral flow can be efficiently generated by the inclination of the facing portion 7a.

Furthermore, the liquid flowing in through the gap in the facing portion 7a joins with the spiral flow to generate turbulence, which agitates the liquid around the ultraviolet lamp 7. As a result, even if the liquid to be purified is low in transparency, the liquid around the ultraviolet lamp 7 is agitated, so that ultraviolet rays can be irradiated evenly onto the liquid in the treatment tank 2. Therefore, the liquid purification device 1 of this embodiment makes it possible to treat a large amount of liquid in a short period of time.

In the above embodiment, the four ultraviolet lamps 7 constituting the facing portion 7a are arranged in a straight line, but this is not limiting, and multiple ultraviolet lamps 7 may be arranged in an arc shape when viewed in the axial direction. In addition, in order to adjust the amount of liquid passing through the gaps between the ultraviolet lamps 7 constituting the facing portion 7a, the spacing between the ultraviolet lamps 7 may be narrowed, or a flow rate adjustment means such as a guide plate may be provided. In addition, the facing portion may be formed by providing a member such as a guide plate inside the treatment tank 2 or the inflow channel 3, rather than by an arrangement of the ultraviolet lamps 7.

In addition, in the above embodiment, the number of ultraviolet lamps 7 is 34, but this is not limited to this and can be changed as appropriate depending on the state of the liquid to be treated, the treatment capacity of the treatment tank 2, or the output of the ultraviolet lamps 7, etc.

In addition, in the above embodiment, the inlet channel 3 is provided below the treatment tank 2 and the outlet channel 4 is provided above the treatment tank 2, but the top and bottom may be reversed. Also, as shown in FIG. 2, the inlet channel 3 and the outlet channel 4 are fixed to the treatment tank 2 so that their respective central axes intersect with the central axis of the treatment tank 2, but the central axes of the inlet channel 3 and the outlet channel 4 may be positioned away from the central axis of the treatment tank 2. This configuration makes it even easier to swirl the liquid within the treatment tank 2.

Reference Signs List 1: Liquid purifying device 2: Treatment tank 2a: Side wall 2b: Space 3: Inlet passage 4: Outlet passage 5: Lid 6: Bottom 7: Ultraviolet lamp (light source cylinder)
7a: facing portion 7b: arrangement portion 7c: irradiation possible range

Claims (3)

An apparatus for purifying a liquid by irradiating the liquid with light including ultraviolet rays,
A treatment tank having a cylindrical side wall;
A plurality of cylindrical light source cylinders are arranged in the treatment tank along an axial direction;
an inlet passage connected to a side of the treatment tank for introducing a liquid to be purified and an outlet passage for discharging the purified liquid;
the inlet passage and the outlet passage are provided offset in an axial direction of the treatment tank,
A liquid purification device characterized in that it has a facing portion provided in the treatment tank or the inlet channel at a point where the liquid flowing in from the inlet channel hits, and arranged at an angle with respect to the flow direction of the liquid from the inlet channel when viewed from the axial direction of the treatment tank. The liquid purification device according to claim 1,
A liquid purification device, wherein the facing portion is formed by an arrangement of the light source cylinders. The liquid purification device according to claim 1 or 2,
Among the plurality of light source cylinders, a plurality of light source cylinders excluding the facing portion are arranged in an arrangement portion,
A liquid purification device according to claim 1, wherein the light source cylinders in the arrangement section are arranged so that the ranges in which the liquid to be treated can be irradiated with ultraviolet light overlap each other.

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