JP5810995B2 - UV treatment equipment - Google Patents

Description

  The present invention relates to an ultraviolet processing apparatus having a cleaning mechanism for cleaning a protective tube of a lamp.

  Conventionally, there has been known an ultraviolet treatment apparatus in which a tubular ultraviolet lamp is installed in a cylindrical treatment tank into which a fluid to be treated flows to kill microorganisms in the fluid to be treated, oxidatively decompose organic substances, and decompose other organic substances. It has been. In this type of ultraviolet processing apparatus, the ultraviolet lamp is inserted into a lamp sleeve (protective tube) so that fragments do not flow out when the ultraviolet lamp is damaged. Further, a cleaning brush (wiping body) for cleaning the surface of the lamp sleeve is provided in the processing tank, and the cleaning sleeve is reciprocated once or several times a day along the longitudinal direction of the lamp sleeve. This prevents the deposition of substances that block the transmission of ultraviolet light on the surface of the substrate. (For example, refer to Patent Document 1).

JP 2007-21434 A

  By the way, it is desirable to use a metal such as titanium having high corrosion resistance as a material used in an ultraviolet processing apparatus for processing a liquid such as seawater that is highly corrosive to metals. However, titanium is expensive and has high workability. Since it is not so good, when a low-priced device is required, it is conceivable to use a relatively inexpensive metal such as stainless steel but also use a corrosion prevention mechanism such as providing a sacrificial electrode, although the corrosion resistance is inferior. .

In the cleaning mechanism, when the cleaning brush is made of a fluororubber resin that is durable against ultraviolet rays, it is not necessary to provide corrosion protection. On the other hand, for example, since a holding member that holds the cleaning brush is required to have mechanical rigidity, it is difficult to use a fluorine-based resin that is inferior in rigidity for the holding member. Must be used. However, when the sacrificial electrode is attached to the treatment tank, the holding member is not necessarily electrically connected to the sacrificial electrode, and thus the corrosion protection effect by the sacrificial electrode may not be obtained.
This invention is made | formed in view of the situation mentioned above, and aims at providing the ultraviolet-ray processing apparatus which can carry out the corrosion prevention of the metal part of a cleaning mechanism more reliably.

  In order to achieve the above object, the present invention provides a protective tube into which a UV lamp is inserted in a processing tank, distributes a fluid to be processed through the processing tank, and emits UV light emitted from the UV lamp. In the ultraviolet processing apparatus that irradiates and processes the fluid to be processed, a cleaning mechanism for reciprocating the wiping body along the protective tube to clean the surface of the protective tube is provided, and an electric part is electrically connected to the metal portion of the cleaning mechanism. And a sacrificial electrode for connection.

  In the above configuration, the sacrificial electrode may be electrically connected to a metal portion of the cleaning mechanism when the wiping body is located at the standby position.

  According to the present invention, since the sacrificial electrode that is electrically connected to the metal portion of the cleaning mechanism is provided, corrosion of the metal portion of the cleaning mechanism can be suppressed.

It is a top view which shows the ultraviolet-ray processing apparatus which concerns on embodiment of this invention. It is a figure which shows the longitudinal cross-section of FIG. It is a figure which expands and shows the contact of FIG.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, as one aspect of the ultraviolet treatment apparatus according to the present invention, in order to avoid marine pollution and pollution caused by microorganisms contained in the ship's ballast water (seawater), pollution, and destruction of the ecosystem. An ultraviolet treatment apparatus that performs sterilization using ballast water as a fluid to be treated will be described.
FIG. 1 is a plan view showing an ultraviolet treatment apparatus according to the present embodiment, and FIG. 2 is a view showing a longitudinal section of FIG.
As shown in these drawings, the ultraviolet processing apparatus 1 includes a cylindrical processing tank 2 constituting a casing, and a rod-shaped ultraviolet lamp body 3 provided in the processing tank 2. The ultraviolet treatment apparatus 1 includes a plurality of ultraviolet lamp bodies 3, but only one of them is shown in FIG. 2, and the others are omitted.

  The treatment tank 2 is closed at both sides by flanges 4 and 5. The treatment tank 2 (including the flanges 4 and 5) is made of a material excellent in ultraviolet resistance and rigidity, for example, stainless steel. A cylindrical introduction port (inlet) 6 for introducing water is disposed on one side of the side surface 2A of the treatment tank 2, and a cylindrical shape for introducing sterilized water is provided on the other side of the side surface 2A. A lead-out port (exit) 7 is provided. The inlet port 6 and the outlet port 7 are provided coaxially so as to be orthogonal to the central axis C of the processing tank 2, and the ultraviolet ray processing apparatus 1 is formed in a cross shape in plan view. From the introduction port 6, water before sterilization is introduced into the treatment tank 2 while maintaining a predetermined flow rate (or flow pressure) by a pump (not shown), and the treatment tank 2 is led to the other outlet port 7 by the flow pressure. Move towards. Then, the water is sterilized by being irradiated with ultraviolet rays from the ultraviolet lamp body 3 while moving in the treatment tank 2, and discharged from the outlet port 7 to the outside.

The ultraviolet lamp body 3 includes a straight tubular ultraviolet lamp 8 and a lamp sleeve (protective tube) 9 as an ultraviolet light transmissive cylindrical tube formed of, for example, quartz glass on which the ultraviolet lamp 8 is mounted.
The lamp sleeve 9 extends parallel to the central axis C of the processing tank 2 and is provided so as to penetrate the flanges 4 and 5 on both sides, and both ends thereof are open. Cases 11 and 12 are fixed to the flanges 4 and 5 outside the processing tank 2, and both end openings of the lamp sleeve 9 are located in the cases 11 and 12. Each case 11, 12 has a detachable lid 13, 14, and the ultraviolet treatment apparatus 1 can be maintained by removing the lid 13, 14.
The ultraviolet lamp 8 has a length that covers the size of the hole diameter of the introduction port 6 and the outlet port 7 when the ultraviolet lamp 8 is mounted on the lamp sleeve 9. Ultraviolet rays are irradiated over the entire range of the flow path leading to.

The ultraviolet ray processing apparatus 1 is provided with a cleaning mechanism 20 that cleans the surface of the lamp sleeve 9. The configuration of the cleaning mechanism 20 will be described in detail. An annular cleaning brush (wiping body) 21 is fitted into the lamp sleeve 9, and each cleaning brush 21 is supported by a cleaning brush support 22.
On the central axis C of the processing tank 2, a ball screw (driving body) 23 penetrating the processing tank 2 is disposed, and the ball screw 23 is fixed to the processing tank 2. A ball screw nut 24 is screwed into the ball screw 23, and a cleaning plate 32 as a moving body is connected to the ball screw nut 24. The cleaning brush support 22 is supported on the cleaning plate 32, and the cleaning plate 32 constitutes a holding member that holds the cleaning brush 21.

  Further, a drive motor 26 is disposed outside the processing tank 2 on the flange 5 side, supported by a motor support 25 fixed to the flange 5, and an output shaft 26 </ b> A of the drive motor 26 and the end of the ball screw 23. The parts are connected by a rotational force transmission mechanism 27. The drive motor 26 may be a waterproof motor if necessary. The motor support 25, the drive motor 26 and the rotational force transmission mechanism 27 are covered with the case 12.

  Under the above configuration, when the ball screw 23 is rotationally driven by the drive motor 26, the cleaning plate 32 connected to the ball screw 23 by the ball screw nut 24 moves along the guide shaft 29 in the processing tank 2. . As the cleaning plate 32 moves, the cleaning brush 21 wipes the outer peripheral surface of the lamp sleeve 9 so that the lamp sleeve 9 is cleaned.

The cleaning plate 32 is in the vicinity of the flange 5 of the processing tank 2 and at least outside the introduction port 6 and the outlet port 7 so as not to cause a shadow of ultraviolet rays during normal (non-cleaning) period ( Stop at the standby position.
When the lamp sleeve 9 is cleaned, as the drive motor 26 is driven, it is on the flange 4 side of the processing tank 2 and at least outside the light emitting part of the ultraviolet lamp 8, that is, near the electrode at the end of the ultraviolet lamp 8. The cleaning plate 32 is reciprocated in the processing tank 2 with the position outside the turning point as the turning point. With this reciprocating movement, the cleaning brush 21 wipes the outer peripheral surface of the lamp sleeve 9, whereby the lamp sleeve 9 is cleaned, and a decrease in the output of ultraviolet rays due to contamination of the lamp sleeve 9 is prevented. The standby position may be set on the flange 4 side, and the turning point may be set on the flange 5 side.

The cleaning brush 21 is made of a resin material having sufficient durability (ultraviolet light resistance) against ultraviolet rays having a sterilizing action wavelength of 220 nm or more (for example, around 254 nm), for example, fluorine rubber. Similarly, the cleaning brush support 22 is also formed of a resin material having excellent ultraviolet resistance.
On the other hand, the cleaning plate 32 is made of a material excellent in ultraviolet resistance and rigidity, for example, stainless steel. Similarly, the ball screw 23 is also made of a material excellent in ultraviolet resistance and rigidity, for example, stainless steel.

  Since the ball screw nut 24 is mechanically slid with the ball screw 23, a ball bearing made of metal (for example, copper) is usually used, and oil or grease is lubricated between the ball screw 23 and the ball bearing. It is necessary to lubricate with an agent. However, under conditions where the fluid is highly corrosive and is irradiated with ultraviolet rays, metal ball bearings corrode early and lubricants such as oils and fats are altered by ultraviolet rays. Can not be used. On the other hand, if the metal ball screw 23 and the metal ball bearing are used in direct contact with each other, the ball screw 23 and the ball bearing are worn in a relatively short period of time even if they are disposed in water. Can not work properly.

  Therefore, the ball screw nut 24 of the present embodiment is formed of a material having excellent wear resistance, for example, a synthetic resin such as polyethylene terephthalate (PET), and the ball screw nut 24 is deteriorated by ultraviolet rays emitted from the ultraviolet lamp body 3. In order to prevent this, a cover 24A made of stainless steel that prevents the surface of the ball screw nut 24 from being exposed to ultraviolet rays is attached to the ball screw nut 24. The cover 24 </ b> A is provided so as to contact the cleaning plate 32.

Since the fluid to be treated to be sterilized by the ultraviolet treatment apparatus 1 is seawater that is highly corrosive to metals, a sacrificial electrode 35 is attached to the treatment tank 2 formed of stainless steel. The sacrificial electrode 35 is formed of, for example, carbon steel, zinc, aluminum, or the like, which is a material having a lower potential than a metal such as stainless steel used for the treatment tank 2 or the like. Since the sacrificial electrode 35 needs to be periodically replaced due to wear, the sacrificial electrode 35 is detachably attached to the flange 5 from the outside of the flange 5. The sacrificial electrode 35 can be mounted at any position in the processing tank 2.
With this sacrificial electrode 35, the metal member such as the ball screw 23 electrically connected to the sacrificial electrode 35 through the treatment tank 2 is prevented from being corroded. On the other hand, the cleaning plate 32 and the cover 24A, which are metal parts that are not electrically connected to the sacrificial electrode 35, may be corroded by the fluid to be processed.

An anticorrosion effect can be obtained by separately attaching a sacrificial electrode to the cleaning plate 32 and the cover 24A. However, since the cleaning plate 32 and the cover 24A are disposed in the processing tank 2 and cannot be easily maintained, they are consumed. Therefore, it is not a good idea to attach the sacrificial electrode that requires periodic replacement to the cleaning plate 32 or the cover 24A.
Therefore, in the present embodiment, the sacrificial electrode 35 is configured to be electrically connected to the cleaning plate 32 and the cover 24A of the cleaning mechanism 20. More specifically, a contact 40 that is electrically connected to the cleaning plate 32 is provided in the processing tank 2.

FIG. 3 is an enlarged view of the contact 40 of FIG.
The contact 40 is made of a material having a higher potential than the sacrificial electrode 35, such as stainless steel. As shown in FIG. 3, the contact 40 is fixed to the flange 5 at a position facing the cleaning plate 32 in the moving direction of the cleaning plate 32. When the cleaning plate 32 is located at the retracted position, the contact The contact portion 40A at the tip of 40 has a length that contacts the cleaning plate 32. 40 A of contact parts of this Embodiment become the elastic member 41 which elastically deforms, This elastic member 41 can be formed using an elastic material other than the spring (for example, leaf | plate spring) shown in FIG. .
On the other hand, a contact surface 50 is formed on the cleaning plate 32 at a position in contact with the contact 40. These contact portions 40A (elastic member 41) and contact surface 50 are covered with a substance having excellent corrosion resistance against seawater such as gold plating.

Next, the operation of the present embodiment will be described.
In the present embodiment, the sacrificial electrode 35 is electrically connected to the cleaning plate 32 such that the sacrificial electrode 35 is electrically connected to a metal portion of the cleaning mechanism 20 such as the cleaning plate 32 and the cover 24A that are not electrically connected to the processing tank 2. The sacrificial electrode 35 is electrically connected to the cleaning plate 32 via the processing tank 2 and the contact 40 because the contact 40 to be connected to the processing tank 2 is provided. Corrosion of the plate 32 and the cover 24A) can be prevented.

  Here, since the cleaning plate 32 does not need to be reciprocated at all times, it is normally disposed at a standby position that does not hinder the irradiation of the fluid to be treated, and reciprocates only when the cleaning operation is necessary. To do. That is, the cleaning plate 32 stays at the standby position for most of the operation time of the ultraviolet ray processing apparatus 1, and the time for leaving the standby position for the cleaning operation is small. For example, when a cleaning operation is performed once a day for 10 minutes, the time during which the cleaning plate 32 leaves the standby position is less than 0.7% per day. Therefore, providing the anticorrosion effect to the cleaning plate 32 at a time of 99.3% is substantially equivalent to providing the anticorrosion effect substantially all the time.

  In the present embodiment, the contact 40 is provided so as to be electrically connected to a metal portion such as the cleaning plate 32 and the cover 24A of the cleaning mechanism 20 when the cleaning brush 21 is in the standby position. The metal part of the cleaning mechanism 20 that is not electrically connected to the processing tank 2 can be sufficiently anticorrosive with a simple configuration in which the contactor 40 that contacts with the processing tank 2 is provided in the processing tank 2. The cleaning plate 32 and the cover 24 </ b> A can have a corrosion life almost the same as that of the processing tank 2 simply by replacing the sacrificial electrode 35.

  In addition, since the contact portion 40A of the contactor 40 is an elastic member 41, even if the stop position of the cleaning plate 32 varies somewhat due to the configuration of the control mechanism of the cleaning mechanism 20, etc., cleaning is performed by the elastic member 41. The displacement of the plate 32 is absorbed. Accordingly, the cleaning plate 32 and the contact 40 can be reliably brought into contact with each other, so that the cleaning plate 32 and the cover 24A can be reliably prevented from being corroded.

  As described above, according to the present embodiment, the cleaning mechanism 21 for reciprocating the cleaning brush 21 along the lamp sleeve 9 to clean the surface of the lamp sleeve 9 is provided, and the cleaning plate 32 of the cleaning mechanism 20 is provided. And a sacrificial electrode 35 electrically connected to a metal part such as the cover 24A. Even if it is a case where the metal part of the cleaning mechanism 20 is not electrically connected with the processing tank 2 by this structure, corrosion of the metal part of the cleaning mechanism 20 can be suppressed.

  Further, according to the present embodiment, the sacrificial electrode 35 is configured to be electrically connected to a metal portion such as the cleaning plate 32 and the cover 24A of the cleaning mechanism 20 when the cleaning brush 21 is located at the standby position. . With this configuration, the metal portion of the cleaning mechanism 20 that is not electrically connected to the processing tank 2 is sufficiently anticorrosive with a simple configuration in which, for example, the contact 40 that contacts the cleaning plate 32 is provided in the processing tank 2. it can.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the contact 40 is provided in the processing tank 2 and the contact surface 50 is provided in the cleaning plate 32. On the contrary, the contact surface 50 is provided in the processing tank 2 and the cleaning plate 32 is provided with the contact surface 50. A contact 40 may be provided. Moreover, you may provide a contactor in both the processing tank 2 and the cleaning plate 32. FIG.
Moreover, in the said embodiment, the contact part 40A (elastic member 41) of the contactor 40 and the contact surface 50 of the cleaning plate 32 were covered with the substance which has the corrosion resistance excellent with respect to seawater, such as gold plating. However, the contact portions 40A and the contact portions themselves of the cleaning plate 32 may be formed of a material having excellent corrosion resistance.

In the above embodiment, the contact member 40 is provided with the elastic member 41, but the cleaning plate 32 may be provided with the elastic member 41. The elastic member 41 may be omitted.
In the above embodiment, the contact 40 is brought into contact with the cleaning plate 32, but may be brought into contact with another metal member (for example, the cover 24A) that is electrically independent from the sacrificial electrode 35.

In the above embodiment, the contact 40 and the contact surface 50 are arranged in a positional relationship facing each other in the moving direction of the cleaning plate 32. However, the present invention is not limited to this, and for example, the side surface of the cleaning plate 32 A contact surface may be provided on the side surface 2 </ b> A side of the processing tank 2 and a contact may be provided so as to contact the contact surface on the side surface of the cleaning plate 32.
Moreover, in the said embodiment, when the cleaning brush 21 was located in a standby position, the contactor 40 was electrically connected to the metal part of the cleaning mechanism 20, but it is not limited to this, For example, the metal part of the cleaning mechanism 20 and the treatment tank 2 (sacrificial electrode) may be connected by a flexible electric wire.
Moreover, in the said embodiment, although the metal part of the cleaning mechanism 20 electrically independent from the processing tank 2 was demonstrated as the cleaning plate 32 and the cover 24A, it is not limited to this, The structure of the cleaning mechanism 20 Any metal portion that is electrically independent from the treatment tank 2 generated by the above-described process may be used.

  Further, in the present invention, the number, arrangement, and interval of the ultraviolet lamp bodies 3 can be appropriately selected according to the ultraviolet treatment conditions, such as providing a plurality of ultraviolet lamp bodies 3 around the central axis C at equal intervals. .

  Moreover, in the said embodiment, although the running water sterilization apparatus whose sterilization target object is water was illustrated as an example of an ultraviolet sterilization apparatus, it is not restricted to this, An ultraviolet lamp is installed in a processing tank, and this sterilization target object is processed by this process. The present invention can be applied to any device as long as it is moved in the tank and is an ultraviolet sterilizer. Moreover, the sterilization target can be applied to all fluids, and examples thereof include liquids such as water and gases such as air.

1 UV treatment device 2 Treatment tank 8 UV lamp 9 Lamp sleeve (protection tube)
20 Cleaning mechanism 21 Cleaning brush (wiping body)
24A Cover (metal part)
32 Cleaning plate (metal part)
35 Sacrificial electrode 40 Contact

Claims (2)

An ultraviolet ray in which a protection tube into which an ultraviolet lamp is inserted is provided in the treatment tank, a fluid to be treated is circulated in the treatment tank, and ultraviolet rays emitted from the ultraviolet lamp are irradiated to the fluid to be treated through the protection tube. In the processing device,
Providing a cleaning mechanism for reciprocating the wiping body along the protective tube to clean the surface of the protective tube;
An ultraviolet treatment apparatus comprising a sacrificial electrode electrically connected to a metal portion of the cleaning mechanism.   2. The ultraviolet processing apparatus according to claim 1, wherein the sacrificial electrode is electrically connected to a metal portion of the cleaning mechanism when the wiping body is located at a standby position.

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