JP2001029941A - Ultraviolet sterilizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple-structured ultraviolet sterilizer capable of almost uniformly irradiating water to be treated with ultraviolet rays. SOLUTION: As for a chamber 31, through which a fluid to be sterilized flows, the section orthogonal to the flow of a fluid to be sterilized is made to have a rectangular shape. An ultraviolet lamp 33 is horizontally set so as to be orthogonal to the flow of the fluid to be sterilized. A baffle 45 for turning the fluid to be sterilized, which flows along the corner of the chamber 31, toward the inside of the chamber, is installed at the corner part of the chamber 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet sterilizer.

[0002]

2. Description of the Related Art In the sterilization of sewage treatment effluent water, the harmful effects of chlorine-based sterilization on the environment have become a problem.
Sterilization by ultraviolet light is promising.

[0003] Ultraviolet sterilization is sterilization by irradiating light to DNA of an object to be sterilized, and therefore, the transmittance of the target liquid (indicating the ratio of the amount of light transmitted) has a great effect.

In particular, in the case of sewage treatment effluent, seasonal fluctuations and changes in water quality due to rainy weather occur. To cope with this, an ultraviolet sterilizer using a medium-pressure mercury lamp, which can exert its ability even with water having a low transmittance, has been developed. It is used.

Here, ultraviolet lamps generally used in ultraviolet sterilizers are classified into low-pressure lamps and medium-pressure lamps according to the difference in the mercury vapor pressure enclosed therein. The respective mercury vapor pressures are about 1 Pa and about 10 to 100 Pa. The power per UV lamp used is
There is a difference of about 100 W for low-pressure lamps and about 2 kW for medium-pressure lamps. In addition, the power per unit lamp length is about 40 times that of the low pressure type in the case of the medium pressure type, which is the difference in lamp illuminance. In addition, in order to handle the processing amount of one medium-pressure lamp with a low-pressure lamp, nearly 20 lamps are required.

In the case of sewage treatment effluent, the water quality is low (the transmittance is low), so that the medium-pressure ultraviolet lamp having a large illuminance as described above is often used. This is because even if it can be processed by several medium-pressure lamps, if low-pressure lamps are used, several tens of lamps will be required, and maintenance of the lamps will be expensive. Also, in the case of the low-pressure type, a large amount of lamps are installed in the water channel, so that the pressure loss of the fluid increases and a large installation space is required.

On the other hand, in the case of a medium pressure lamp, the illuminance is large, and conversely, the irradiation time becomes extremely short. This is because the dose of ultraviolet light necessary for the organism to be sterilized (the product of the illuminance on the target and the irradiation time, and the unit is mJ / cm ² ) is fixed, so the higher the illuminance, the shorter the irradiation time It is.

In particular, in recent years, high-illumination medium-pressure lamps having a reduced lamp length have been developed. Here, a high-intensity medium-pressure lamp means that power input per unit length is 40
Refers to a lamp of about 100 W / cm. As an example, a lamp with a power of 2 kW, a 70 cm
cm. Such high-intensity medium-pressure UV lamps with very high illuminance per unit length have a shorter lamp length than existing lamps of the same power, and when they are applied to sterilization, they have different structures from existing structures. Need to be made.

That is, since the illuminance is high with respect to the required dose of sterilization, the irradiation time can be shortened. However, the fact is that the flow velocity of each part of the water to be treated passing through the lamp in a short time is surely grasped. Otherwise, some of the water to be treated will short-pass without reaching the ultraviolet radiation dose required for sterilization, and the rate of sterilization failure will increase. In particular, sewage treatment effluent not only has large fluctuations in water quality, but also has a transmittance of 70%,
Sterilization rate of 9 at 15 mg / l of SS (suspended solids) component
Such a short path poses a problem because there is a demand for a strict value such as 9.9%. From the above, the UV sterilizer (especially high-illumination medium-pressure lamp UV sterilizer) needs to rigorously analyze the relationship between lamp illuminance and flow, and determine the lamp arrangement and chamber shape that can secure the minimum UV dose. .

In the case of a medium-pressure lamp, especially the high-illuminance medium-pressure lamp, the required irradiating distance of ultraviolet rays can be ensured even when water quality is deteriorated (decrease in transmittance) because the lamp illuminance is large. For this reason, it is not necessary to arrange a large number of lamps close to each other like a lamp having a small illuminance, and a large gap between the lamps can be obtained. Therefore, it is easy to install a mechanical wiper device attached to the outer periphery of the protective tube of the lamp, Also, the resistance to the flow of the water to be treated can be reduced.

However, there is a large difference in the irradiation dose between the treatment water irradiated with ultraviolet rays near the surface of the lamp having a large illuminance and the treatment water irradiated with ultraviolet rays at the farthest position. When high sterilization efficiency is required, sterilization is required for the light passing through the most distant position. Therefore, when aiming at this portion, the water to be treated near the lamp will be given an excessive irradiation dose. Therefore, it is necessary to determine the shape of the chamber around the lamp of the ultraviolet sterilizer (particularly, a high-intensity medium-pressure lamp ultraviolet sterilizer) to solve this problem.

FIGS. 9 (a) and 9 (b) are views showing a conventional ultraviolet sterilizer, wherein FIG. 9 (a) is a side sectional view and FIG. 9 (b) is a view of FIG. 9 (a). FIG. As shown in the figure, this ultraviolet sterilizer has a cylindrical casing 8.
1 to form a chamber 83, three ultraviolet lamps 85 are installed in the chamber 83 at symmetrical positions around the central axis, and a wiper (protective tube cleaning tool) 89 is placed at the central axis position with an arrow B. Ball screw 87 driven in the direction
It is configured with attached. A water supply port 91 for supplying and discharging the water to be treated and a drain port 93 are provided on the left and right sides of the casing 81. Each ultraviolet lamp 85 is protected by a cylindrical protective tube 95 around its periphery. Then, when the ultraviolet light lamp 85 is turned on by flowing the water to be treated as shown by the arrow in the figure, the water to be treated is sterilized by the ultraviolet rays. Further, the surface of the protective tube 95 contaminated with the water to be treated is cleaned by driving the drive motor 97 and rotating the ball screw 87 to move the wiper 89 in the direction of arrow B. The reason why the wiper 89 is provided is that dirt easily adheres to the surface of the protective tube 95 in the case of water to be treated such as sewage treatment discharge water, and if the adhered dirt is left as it is, it passes through the protective tube 95. This is because the attenuation of the amount of ultraviolet light increases and the germicidal effect decreases.

However, in this ultraviolet sterilizer, the water to be treated which has flowed in a direction perpendicular to the ultraviolet lamp 85 flows in a direction parallel to the ultraviolet lamp 85 and then flows out again in a direction perpendicular to the ultraviolet lamp 85. Therefore, it is difficult to analyze the flow of the water to be treated, and it is difficult to uniformly irradiate the water to the water to be treated.

On the other hand, as shown in FIG. 10, three ultraviolet lamps 85 are installed in a cylindrical casing 81 in parallel.
An ultraviolet sterilizer for flowing water to be treated in a direction perpendicular to the longitudinal direction of the ultraviolet lamp 85 is also conceivable. The illustration of the wiper mechanism is omitted in FIG. This configuration is suitable for a medium-pressure lamp that requires a short irradiation time of ultraviolet light to the water to be treated.

However, in the case of this ultraviolet sterilizer,
The water to be treated that has flowed into the casing 81 is shaped to be squeezed again when it is drained after being spread once, so that the flow of the water to be treated is not uniform and complicated, and the flow velocity in each part is different. It is difficult, and it becomes difficult to uniformly irradiate the water to be treated with ultraviolet rays.

Since the amount of the ultraviolet rays irradiated from both ends of the ultraviolet lamp 85 is smaller than that of the other parts, the required amount of the ultraviolet light to the water to be treated passing near the both ends of the ultraviolet lamp 85 is required. There is also a problem that only irradiation cannot be performed.

In the case of the water to be treated, to which dirt is more likely to adhere, it is necessary to provide a wiper mechanism as shown in FIG. 9, but since the wiper mechanism is installed inside the chamber 83, the wiper 89 obstructs the irradiation of ultraviolet rays. become. In addition, the wiper 89 is at one end of the protection tube 95 at the time of standby, but this obstructs the flow of the water to be treated, thereby affecting the sterilization effect. Further, the rubber wiper 89 is deteriorated by being exposed to the heat of ultraviolet rays or ultraviolet rays.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a simple ultraviolet sterilizer having a structure capable of irradiating ultraviolet rays to water to be treated substantially uniformly. Is to do.

It is another object of the present invention to provide an ultraviolet sterilizer in which a wiper mechanism does not hinder the flow of water to be treated and is hardly deteriorated.

[0020]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an ultraviolet sterilization apparatus having a sterilization lamp installation section in which an ultraviolet lamp for sterilization is installed in a chamber through which a fluid to be sterilized flows. The shape of the chamber of the disinfecting lamp installation portion is characterized in that a cross section orthogonal to the flow of the sterilizing fluid is rectangular, and the ultraviolet lamp is installed so as to be orthogonal to the flow of the sterilizing fluid. Further, the present invention is characterized in that a baffle for directing a fluid to be sterilized flowing along the corner to the inside is provided at a corner portion of the chamber. In addition, the germicidal lamp installation section,
The apparatus is characterized in that one or a predetermined number of ultraviolet lamps are installed in a chamber, and a plurality of unit units are connected in series in the flow direction of the fluid to be sterilized. Further, the present invention provides a wiper for mechanically wiping by moving an outer peripheral surface of a protective tube surrounding a periphery of the ultraviolet lamp in a longitudinal direction of the protective tube, and the wiper is on standby or folded at the germicidal lamp installation portion. The wiper storage section is provided at a position exceeding the width of the chamber. Further, the present invention is characterized in that a wiper guard for covering the wiper storage portion is attached, and a baffle portion protruding toward the chamber is provided at least on an upstream side around an opening of the wiper guard through which the wiper is inserted.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. First Embodiment FIGS. 1 and 2 show an ultraviolet sterilizer according to a first embodiment of the present invention. FIGS. 1A and 1B are a plan view, a side view, and a view, respectively. 2 (a), FIG.
2B is a schematic side cross-sectional view and a cross-sectional schematic view (EE cross-sectional view of FIG. 2A) of the inside of the germicidal lamp installation unit 30. However, the illustration of the wiper mechanism is omitted in FIG.

As shown in these figures, in this ultraviolet sterilizer, the introduction pipe section 10, the sterilization lamp installation section 30, and the outflow rectification pipe section 20 are all linearly arranged so that the flow of the fluid flowing inside does not bend. It is configured by serially connecting. Hereinafter, each component will be described.

The introduction pipe section 10 has an inflow side connection flange 11 at one end. Further, the shape of the intermediate portion of the introduction tube portion 10 is gently changed so that the tube shape on the inflow side connection flange 11 side is circular, and the tube shape on the germicidal lamp installation portion 30 side is rectangular. .

The outflow rectification tube portion 20 has an outflow side connection flange 21 at one end. In addition, this outflow rectification pipe part 2
0, the pipe shape on the outflow side connection flange 21 side is circular,
The shape of the intermediate portion is gently changed so that the tube shape on the germicidal lamp installation section 30 side is rectangular.

Next, the germicidal lamp installation section 30 is provided with a chamber 31 in which a fluid to be sterilized flows. The shape of the chamber 31 is formed such that a cross section orthogonal to the flow of the fluid to be sterilized (that is, a cross section, see FIG. 2B) is rectangular. The width (width) of the chamber 31 is
The length is set to be within (approximately equal to) the length of the light emitting portion of the ultraviolet lamp 33 to be used.

In the chamber 31, all three ultraviolet lamps 33 are provided with a ball screw 41 installed in the center so as to be horizontal and perpendicular to the flow in the chamber 31.
Are installed at equal angles (at 120 ° intervals) with respect to the center. The ultraviolet lamp 33 is constituted by a high-illumination medium-pressure lamp having a supply power per unit length of 40 W / cm or more.

Each ultraviolet lamp 33 is covered with a cylindrical protective tube 35 so that the fluid to be sterilized does not directly contact the ultraviolet lamp 33. As shown in FIG. 1, a ring-shaped rubber wiper 37 surrounding each of the protection tubes 35 is attached.
Are connected by an arm plate 39, the ball screw 41 is passed through the center of the arm plate 39, and a wiper motor 43 attached to the outside of the germicidal lamp installation section 30 is driven.
1 is rotated to drive the arm plate 39 and the wiper 37.

Further, the chamber 3 of the germicidal lamp installation section 30
1 at the four corners, the UV lamp 33
A baffle 45 for inwardly directing the fluid to be sterilized flowing along the corner is provided near the inner wall of the chamber 31 near the inner wall. The baffle 45 has a triangular shape, and prevents the fluid from flowing through each corner as it is and directs the flow inward.

Next, in order to sterilize the fluid to be sterilized using this ultraviolet sterilizer, the inflow side connection flange 11 and the outflow side connection flange 21 are connected, for example, in the middle of a pipe through which sewage treatment discharge water flows. Good.

Then, sewage treatment discharge water (fluid to be sterilized) is passed through the ultraviolet sterilizer, and the three ultraviolet lamps 3 are used.
Light 3 As a result, the sewage treatment discharge water is irradiated with ultraviolet rays at a dose required for sterilization, and the sterilization is performed efficiently. On the other hand, the surface of the protective tube 35 to which dirt has adhered by flowing the sewage treatment discharge water is rotated by driving the wiper motor 43 to rotate the ball screw 41 and to attach the wiper 37 to the protective tube 35.
And the whole is mechanically wiped and cleaned.

By the way, in this ultraviolet sterilizer,
Since the ultraviolet lamp 33 is installed horizontally, the lamp life is increased as compared with the case where the ultraviolet lamp 33 is installed vertically. This is because, when the ultraviolet lamp 33 is installed in the vertical direction, the cooling effect of the fluid in the upper part and the lower part of the ultraviolet lamp 33 differs depending on the temperature difference between the upper and lower parts of the flowing fluid, thereby shortening the lamp life. When installed horizontally, the cooling effect of each part of the ultraviolet lamp 33 by the fluid becomes the same, each part is cooled uniformly, and the lamp life is prolonged.

In this embodiment, the calculation of the ultraviolet irradiation dose is facilitated by installing the ultraviolet lamp 33 so as to be orthogonal to the flow of the sewage treatment discharge water. That is, in the system in which the ultraviolet lamp 33 is installed parallel to the flow of the sewage treatment discharge water as shown in FIG. 9, the flow direction of the flow into and out of the chamber 83 is due to the support portions (power supply connection portions) at both ends of the lamp. Then, it is inevitable to be from the side of the chamber 83. Therefore, the velocity distribution around the ultraviolet lamp 33 changes due to the flow rate fluctuation, and it is necessary to perform the flow velocity distribution analysis in each state to obtain the dose analysis, which is practically difficult. On the other hand, as in the present embodiment, the ultraviolet lamp 33
Is orthogonal to the flow, the flow of the sewage effluent becomes linear from the inflow to the outflow, and the fluctuation of the flow rate is simply the fluctuation of the flow velocity, so analysis is easy and the reliability of the sterilization process is improved. .

In particular, in the present invention, since the shape of the chamber 31 is rectangular, the flow speed of the sewage discharge water in the chamber 31 is substantially the same in each part, and therefore, the flow around each ultraviolet lamp 33 is different in each part. As a result, the speed becomes substantially uniform, and even if the irradiation is performed for a short time, all the fluids can be reliably supplied with the ultraviolet dose necessary for sterilization.

In this embodiment, a medium-pressure lamp, particularly a high-intensity medium-pressure lamp is used as the ultraviolet lamp 33, so that the lamp illuminance is large and the water quality is poor (the transmittance is low).
The required UV irradiation distance can be secured for the sewage treatment effluent, so that there is no need to arrange a large number of lamps close to each other as in the case of UV lamps with low illuminance, and a large gap between the lamps can be obtained. The wiper 37 attached to the outer periphery of the protection tube 35 of the ultraviolet lamp 33 can be easily installed, and the resistance to the flow of the sewage treatment discharge water can be reduced. On the other hand, by using a high-intensity medium-pressure lamp, the irradiation time of ultraviolet rays to the sewage treatment effluent can be shortened. As described above, in the present embodiment, the chamber 31 is formed in a rectangular shape so that the flow speed around each ultraviolet lamp 33 is made substantially uniform in each part, and the ultraviolet ray necessary for sterilization is given to all the fluids without fail. Therefore, such a problem does not occur.

The vicinity of both ends of the ultraviolet lamp 33 is
Since the irradiation amount of the ultraviolet rays is smaller than that of the other parts, the part of the chamber 31 to which the ultraviolet rays are irradiated is weakest.
These are four corners of the chamber 31 formed in a rectangular shape. However, in this embodiment, since the baffle 45 is provided at the corner portion of the chamber 31 as described above, the sewage treatment discharge water flowing along the corner portion is directed to the inside, and ultraviolet rays are reliably irradiated. .

Further, in this embodiment, three ultraviolet lamps 33 are arranged so that the same ultraviolet dose acts on the sewage discharge water passing between the lamps. That is, as a result of calculating the illuminance attenuation with the distance from the ultraviolet lamp 33 using the ultraviolet lamp 33 as a line light source, the arrangement is such that the interval between the protective tubes 35 of the adjacent ultraviolet lamps 33 is the same as the interval L1, The distance between the protective tube 35 of the ultraviolet lamp 33 and the inner wall of the chamber 31 is L2, and “L1 = 4L2”
In this case, the distance between the ultraviolet lamps 33 and the minimum illuminance on the inner wall surface of the chamber 31 become the same, and the flow of the sewage treatment discharge water can be uniformly irradiated with ultraviolet light in the entire height direction.

If the number of ultraviolet lamps 33 to be installed is large, a plurality of sterilizing lamp installation sections 30 may be connected in series between the introduction pipe section 10 and the outflow rectification pipe section 20.

[Second Embodiment] FIG. 3 is a view showing an ultraviolet sterilizer according to a second embodiment of the present invention.
(A) is a partial cross-sectional side view, and (b) of FIG.
It is A sectional drawing. In this embodiment, the same or corresponding portions as in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The ultraviolet sterilizer in this embodiment is also
The apparatus includes an introduction pipe section 10, a germicidal lamp installation section 30, and an outflow rectification pipe section 20, all of which are connected in series in a straight line so that the flow of fluid flowing inside does not bend.

In the germicidal lamp installation section 30 in this embodiment, the chamber 31 is formed so that the cross section (that is, the cross section) orthogonal to the flow of the fluid to be sterilized is rectangular. The width (width) of 31 is set to be within (approximately equal to) the length of the light emitting portion of the ultraviolet lamp 33 used. In the case of this embodiment, the number of the ultraviolet lamps 33 installed in the chamber 31 is one, and the ultraviolet lamps 33 are installed at a central position in the chamber 31 which is horizontal and orthogonal to the flow. On the downstream side of the ultraviolet lamp 33, a ball screw 41 is installed in parallel with the ultraviolet lamp 33, and the outer peripheral surface of the protective tube 35 of the ultraviolet lamp 33 is wiped by a wiper 37 attached to a flat arm plate 39 screwed to the ball screw 41. It is configured to be mechanically cleaned. It is the same as the first embodiment that the ultraviolet lamp 33 is constituted by a high-illumination medium-pressure lamp having a supply power per unit length of 40 W / cm or more.

Also in this embodiment, the ultraviolet lamps 33 are provided at the four corners of the chamber 31.
, A triangular baffle 45 for inwardly directing the fluid to be sterilized flowing along the corner is provided. Further, wipers 3 are provided at both ends in the width direction of the chamber 31.
Wiper storage portions 47 and 49 in which the standby / return 7 is provided are provided.

FIG. 4 is a schematic configuration diagram showing an application example of the germicidal lamp installation section 30 in the second embodiment. That is, in this embodiment, a unit provided with one ultraviolet lamp 33 in the chamber 31 is a unit unit 30.
The sterilizing lamp installation unit 30 is configured by connecting a plurality of unit units 30a in series in the flow direction of the fluid to be sterilized as a.

The unit unit 30a is provided with baffles 51 on the upper and lower inner wall surfaces at an upstream end (or a downstream end). That is, the baffle 51 is provided between the plurality of unit units 30a. Here, FIG.
FIG. 5 is a view of a portion of the baffle 51 viewed from a liquid flow direction. As shown in FIG.
Is formed by a rectangular elongated flat plate which covers the entire width of the rectangular plate.

If the germicidal lamp installation section 30 is configured as described above, the number of lamps required for sterilization can be secured by flange-connecting the unit units 30a.

Further, in this embodiment, the dimensions of each member in the chamber 31 are determined by the size of the protective tube 3 of the front and rear ultraviolet lamps 33.
Assuming that the distance between the protective tubes 35 is P, the distance between the protective tube 35 and the inner wall of the chamber 31 is L, the height of the baffle 51 is h, and the outer diameter of the protective tube 35 is D, the relationship of P ≦ 4L h <D / 2 is obtained. I try to meet.

In order to sterilize the fluid to be sterilized by using the ultraviolet sterilizer, the ultraviolet sterilizer is connected, for example, in the middle of a pipe through which the sewage discharge water flows, and the sewage discharge water (fluid to be sterilized) flows. , Each of the unit units 30a
The ultraviolet lamp 33 installed inside is turned on. As a result, the sewage treatment discharge water is irradiated with ultraviolet rays at a dose required for sterilization, and the sterilization is performed efficiently.

In this embodiment, the baffle 5
1 is provided for the following reason. That is, the chamber 31
Is formed in a rectangular shape and the effluent discharged from the sewage treatment system flows along the upper and lower wall surfaces. Next UV lamp 3 away from
In 3, move to the center side. That is, the portion having the lowest illuminance in the upstream ultraviolet lamp 33 passing through the vicinity of the wall surface moves to the center in the next ultraviolet lamp 33 and becomes high illuminance. As a result, the dose of ultraviolet rays to the entire sewage treatment discharge water is averaged. Because you can. In other words, the UV dose can be very close to the value calculated from the average illuminance.

When a plurality of unit units 30a are installed, each ultraviolet lamp 33 is partially turned off in accordance with the flow rate and transmittance, or a control means separately provided to control the illuminance of each ultraviolet lamp 33. , The required sterilization rate can be secured with the minimum energy.

In the case of this embodiment, the unit 30
Since the ultraviolet lamps 33 are installed one by one in a, the illuminance of the ultraviolet rays to the sewage treatment discharge water can be changed by turning off the ultraviolet lamps 33 one by one or controlling the illuminance.

According to the data on the germicidal rate of bacteria, doubling the dose increases the germicidal rate exponentially by one. That is, when the sterilization dose is doubled, tripled, and quadrupled, when the initial sterilization rate is 90%, 99%, 99.9%, 99.
99%. Accordingly, if the sterilization rate when one ultraviolet lamp 33 is used can be analyzed, the number of the ultraviolet lamps 33 may be added so that the required sterilization rate is obtained, and the apparatus configuration can be simplified. That is, the ultraviolet lamp 3
3. If one unit unit 30a is made as a constituent unit, a unit having a desired sterilization rate can be easily configured by connecting the unit units 30a.

In the case of the embodiment shown in FIG. 1, when a plurality of germicidal lamp installation sections 30 are connected, if only one of the three ultraviolet lamps 33 is turned off, etc. Since the UV irradiation dose varies, the light can be turned off only in units of three lines. However, in this embodiment, the light can be turned off one by one, so that fine adjustment is possible.

In this embodiment, the chamber 31
Is made substantially equal to the length of the light emitting portion of the ultraviolet lamp 33 because the sewage discharge water is uniformly irradiated except for both ends of the ultraviolet lamp 33 in the width direction.
This is because the calculation parameters of the ultraviolet irradiation dose to the sewage treatment discharge water are reduced, and the calculation becomes easy. This is the same in other embodiments.

Since the light from the lighting portion of the ultraviolet lamp 33 is substantially the same in any of the lamp widths, the dose can be calculated as the same as described above. However, since the illuminance is reduced at both ends, it is the same as in the first embodiment. A baffle 45 is provided at the corner to force the flow to move inward, so that the same amount of ultraviolet rays as the fluid flowing through the other parts is also applied to the sewage discharge water flowing through the corner.

Third Embodiment FIG. 6 is a view showing an ultraviolet sterilizer according to a third embodiment of the present invention.
6A is a plan sectional view, and FIG. 6B is a CC sectional view of FIG. 6A. In this embodiment, the same or corresponding parts as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0055] The ultraviolet sterilizer in this embodiment comprises:
Introducing pipe section 10, germicidal lamp installation section 30, and outflow rectifying pipe section 2
0 is integrated.

In the germicidal lamp installation section 30 of this embodiment, the shape of the chamber 31 is formed such that a cross section (that is, a cross section) orthogonal to the flow of the fluid to be sterilized is rectangular. The width (width) of 31 is set to be within (approximately equal to) the length of the light emitting portion of the ultraviolet lamp 33 used. Also in this embodiment, the number of the ultraviolet lamps 33 installed in the chamber 31 is one, and the ultraviolet lamps 33 are installed in the chamber 31 so as to be horizontal and orthogonal to the flow. On the downstream side of the ultraviolet lamp 33, a ball screw 41 is provided in parallel with the ultraviolet lamp 33, and the outer peripheral surface of the protective tube 35 is mechanically wiped by a wiper 37 attached to a flat arm plate 39 screwed to the ball screw 41. It is configured to be washed. The UV lamp 33 is constituted by a high-illumination medium-pressure lamp having a supply power per unit length of 40 W / cm or more, as in the first and second embodiments.

In this embodiment, the wiper storage portions 47 and 49 where the wiper 37 and the arm plate 39 are on standby and folded back are positioned at both ends in the width direction of the chamber 31 of the germicidal lamp installation portion 30 at positions exceeding the width of the chamber 31. Is provided.

At the entrances of the wiper storage sections 47 and 49,
Plate-shaped wiper guards 53, 53 covering these are attached.

FIG. 7 is a perspective view of the wiper guard 53. As shown in the figure, the wiper guard 53 is formed in a flat plate shape, provided with an opening 55 through which the wiper 37 and the arm plate 39 are inserted, and provided around the opening 55 with a baffle portion 57 protruding toward the chamber 31. Have been.

On the other hand, as shown in FIG.
On the upstream side of 7, other baffles 59, 59 are attached. FIG. 8 is a sectional view taken along the line DD in FIG. 6B. As shown in the figure, the baffles 59, 59 are provided on both left and right wall surfaces in the chamber 31 in an elongated rectangular shape over the entire vertical length.

Then, this ultraviolet sterilizer is connected, for example, in the middle of a pipe through which sewage treated effluent flows, the sewage treated effluent (fluid to be sterilized) is flown, and the ultraviolet lamp 33 is turned on to sterilize the sewage treated effluent. The necessary dose of ultraviolet rays is irradiated, and the sterilization is performed efficiently.

In this embodiment, since the wipers 37 and the arm plate 39 are housed when the wiper mechanism is not driven by providing the wiper housing sections 47 and 49, the movement of the fluid in the chamber 31 is disturbed by the wiper mechanism. It is not preferred and is preferred. Further, since the wiper 37 is housed in the wiper housing part 47 (or 49), it is not exposed to heat or ultraviolet rays of the ultraviolet lamp 33 during standby, so that deterioration of the rubber edge for the wiper 37 can be prevented.

The wiper guard 53 has a baffle 57
Is provided, it becomes difficult for the sewage treatment discharge water flowing from the upstream side to enter the wiper storage portion 47 (49) from the opening 55, and the water in the wiper storage portion 47 (49) becomes dead water and becomes inside the chamber 31. Fluid movement is no longer disturbed. The baffle portion 57 may be provided not on the entire periphery of the opening 55 but only on the upstream portion thereof.

The flow of the sewage discharge water near both ends of the ultraviolet lamp 33 is separated from the wall surface of the chamber 31 by the baffle portion 57 and the ultraviolet lamp 33
Since it moves toward the center, the amount of ultraviolet light required for the sewage treatment discharge water flowing at both ends of the ultraviolet lamp 33 does not become insufficient.

Furthermore, in the case of this embodiment, the baffle 59 is provided on the upstream side of the baffle portion 57, so that not only the inflow of the sewage treatment discharge water into the opening 55 can be prevented more effectively, but also the water flows on the wall surface. The UV irradiation dose to the sewage treatment discharge water is less likely to be insufficient.

In the sterilization of sewage treatment discharge water, the water to be treated may be secondary treatment water, and the transmittance is as low as about 70%.
S may also be 10 mg / l or more. Therefore protection tube 3
5 A wiper device for cleaning the surface is always required, and it is usually operated about twice per day.
There may be times / day. The required bactericidal rate of the sewage treatment effluent is 99.9% or more. However, in order to obtain such a high germicidal rate with a water quality that easily changes in properties, the sterilizing dose must be sufficiently considered in consideration of the chamber shape. It is necessary to reduce as much as possible the rate of passing through this device due to lack. In the present embodiment, even if the wiper device is installed, the problem of sterilization failure that occurs due to the installation of the wiper device is solved by providing the wiper storage portions 47 and 49 or attaching the wiper guard 53, and it is required. Sterilization rates can be achieved.

In each of the above embodiments, an example in which the ultraviolet sterilizer is used for sewage treatment discharge water has been described. However, it may be used for sterilization of recycled water in agricultural settlement drainage and river purification. In short, any fluid can be applied as long as it is a fluid to be sterilized by ultraviolet rays. In addition, the present invention has a limitation that a large place cannot be taken particularly as an installation place,
In addition, it is suitable for use in a place where the fluid to be sterilized deteriorates temporally and seasonally.

In each of the above embodiments, a medium-pressure ultraviolet lamp, particularly a high-illuminance medium-pressure ultraviolet lamp, is used as the ultraviolet lamp. However, in some cases, the invention may be applied to a low-pressure ultraviolet lamp.

[0069]

As described in detail above, the present invention has the following excellent effects. The chamber shape of the germicidal lamp installation section is rectangular in cross section perpendicular to the flow of the fluid to be sterilized, and the ultraviolet lamp is installed so as to be orthogonal to the flow of the fluid to be sterilized. Is substantially the same in each part, so that the flow around the ultraviolet lamp is substantially uniform in each part, and even if irradiation is performed for a short time, all the fluids can be reliably supplied with the ultraviolet ray dose necessary for sterilization. This is a medium-pressure ultraviolet lamp that can secure a necessary ultraviolet irradiation distance even for a sterilization target fluid having a large lamp illuminance and poor water quality (low transmittance) as an ultraviolet lamp,
This is particularly effective when a high-illumination medium-pressure ultraviolet lamp is used.

Since the baffle is installed at the corner of the rectangular chamber where the ultraviolet light irradiated by the ultraviolet lamp is the weakest, the fluid to be sterilized flowing along the corner can be directed inward, and the ultraviolet light can be reliably applied to this. Can be irradiated.

The sterilizing lamp installation section was constructed by connecting one or a predetermined number of ultraviolet lamps in the chamber as a unit unit and connecting a plurality of unit units in series in the flow direction of the fluid to be sterilized. Can be turned off in units of units according to the flow rate and transmittance, or the illuminance can be controlled in units of units, and the required sterilization rate can be secured with the minimum energy.

Since the wiper storing section in which the wiper is on standby or turned back is provided at a position exceeding the width of the chamber, the movement of the fluid in the chamber is not disturbed by the wiper mechanism. In addition, when the wiper is in a standby state, the wiper is not exposed to the heat of the ultraviolet lamp or the ultraviolet light, so that the wiper can be prevented from being deteriorated.

Since a baffle is provided at least on the upstream side around the opening through which the wiper of the plate-shaped wiper guard for covering the wiper storage section is inserted, the sewage treatment discharge water flowing from the upstream side is stored in the wiper storage through the opening. This makes it difficult to enter the inside of the chamber, and the movement of the fluid in the chamber is not disturbed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an ultraviolet sterilizer according to a first embodiment, and FIGS. 1 (a) and 1 (b) are a plan view and a side view, respectively.

FIGS. 2 (a) and 2 (b) are a schematic side cross-sectional view and a schematic cross-sectional view, respectively, of the inside of a germicidal lamp installation section 30 (however, a description of a wiper mechanism is omitted).

FIG. 3 is a view showing an ultraviolet sterilizer according to a second embodiment, FIG. 3 (a) is a partially cutaway side view, and FIG. 3 (b) is FIG.
It is an AA sectional view of (a).

FIG. 4 is a schematic configuration diagram showing an application example of a germicidal lamp installation section 30 in the second embodiment.

FIG. 5 is a cross-sectional view of a portion of a baffle section 51 viewed from a flow direction of a fluid.

FIG. 6 is a view showing an ultraviolet sterilizer according to a third embodiment, FIG. 6 (a) is a plan sectional view, and FIG. 6 (b) is FIG.
It is CC sectional drawing of (a).

7 is a perspective view of the wiper guard 53. FIG.

FIG. 8 is a sectional view taken along the line DD in FIG. 6 (b).

FIG. 9 is a view showing a conventional ultraviolet sterilizer;
9A is a side sectional view, and FIG. 9B is an aa sectional view of FIG. 9A.

FIG. 10 is a sectional view showing another conventional ultraviolet sterilizer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Introducing pipe part 11 Inflow side connection flange 20 Outflow rectification pipe part 21 Outflow side connection flange 30 Sterilization lamp installation part 31 Chamber 33 Ultraviolet lamp 35 Protective tube 37 Wiper 39 Arm plate 41 Ball screw 43 Wiper motor 45 Baffle 47, 49 Wiper storage Unit 30a unit unit 51 baffle 53 wiper guard 55 opening 57 baffle unit 59 baffle

Claims (5)

[Claims] 1. An ultraviolet sterilization apparatus comprising a sterilization lamp installation section in which an ultraviolet lamp for sterilization is installed in a chamber through which a fluid to be sterilized flows. An ultraviolet sterilizer characterized in that a cross section orthogonal to the rectangle is rectangular and the ultraviolet lamp is installed so as to be orthogonal to the flow of the fluid to be sterilized. 2. The ultraviolet sterilizer according to claim 1, wherein a baffle for directing a fluid to be sterilized flowing along the corner to the inside is installed at a corner portion of the chamber. 3. The germicidal lamp installation section is configured by connecting a plurality of unit units in series in a flow direction of a sterilization target fluid, with one or a predetermined number of ultraviolet lamps installed in a chamber as a unit unit. The ultraviolet sterilizer according to claim 1 or 2, wherein: 4. A wiper for wiping mechanically by moving an outer peripheral surface of a protective tube surrounding the periphery of the ultraviolet lamp in a longitudinal direction of the protective tube, and the wiper is in a standby or folded state at the sterilizing lamp installation portion. The ultraviolet sterilizer according to any one of claims 1 to 4, wherein the wiper accommodating portion is provided at a position exceeding a width of the chamber. 5. A wiper guard for covering the wiper storage portion, and a baffle portion protruding toward the chamber is provided at least at an upstream portion around an opening of the wiper guard through which the wiper is inserted. Item 5
The ultraviolet sterilizer according to the above.