JP5347882B2 - UV irradiation equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultraviolet irradiation apparatus capable of detecting the position of a cleaning brush in a noncontact manner without causing uneven ultraviolet irradiation. <P>SOLUTION: In the ultraviolet irradiation apparatus 1 for ultraviolet treatment of a fluid to be treated introduced into a treatment tank 2 by ultraviolet irradiation from a plurality of ultraviolet lamps 12 each inserted into a protective tube 10 and arranged at regular intervals around the center axis O of the treatment tank 2, a cleaning plate 21 is provided for cleaning the surface of the protective tube 10 of the ultraviolet lamp 12 while reciprocating along the center axis O. The cleaning plate 21 is provided with a metal rod 71 disposed at a position facing a closing flange 4 for closing the end face of the treatment tank 2, and the closing flange 4 is provided with a proximity sensor 60 for detecting the proximity of the metal rod 71 of the cleaning plate 21. The cleaning plate 21 is stopped on the basis of the detection of the metal rod 71 by the proximity sensor 60 when the cleaning plate 21 is moving toward the closing flange 4 provided with the proximity sensor 60. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an apparatus for performing an ultraviolet irradiation process on a fluid flowing into a processing tank, and more particularly to a technique for detecting the position of a brush for cleaning an ultraviolet lamp arranged in the processing tank.

  A tubular ultraviolet ray lamp that extends along the flow direction of the fluid is installed in a cylindrical treatment tank into which the fluid to be treated flows, killing microorganisms in the fluid to be treated, oxidative decomposition of organic matter, and decomposition of other organic substances Ultraviolet irradiation devices that perform such operations are known. Such an ultraviolet irradiation device is installed in a water purification plant and is suitably used for water purification treatment of raw water. In the ultraviolet irradiation device used in the water purification plant, the ultraviolet lamp is inserted into the lamp protection tube so that the fragments do not flow out when the ultraviolet lamp is damaged. Further, a cleaning brush for cleaning the surface of the lamp protection tube is provided in the treatment tank, and this cleaning brush is reciprocated once or several times a day along the longitudinal direction of the lamp protection tube. It prevents the deposition of substances that prevent the transmission of ultraviolet light on the surface.

  By the way, in order to control the reciprocating movement of the cleaning brush, it is necessary to detect that at least the cleaning brush has reached the end of the processing tank, but the inside of the processing tank is pressurized by the fluid. It is difficult to detect the position of the cleaning brush by directly arranging the sensor. Therefore, conventionally, a tube body similar to the lamp protection tube is arranged in the processing tank, and a magnetic sensor is housed in the tube body, and a magnet is attached to the cleaning brush to be detected, and is attached to the end of the processing tank. A technique has been proposed in which a magnetic sensor detects from a tubular body that a cleaning brush has reached a set standby position (see, for example, Patent Document 1).

JP 2007-21434 A

However, when a tube containing a magnetic sensor is placed in the treatment tank, there is a problem that unevenness in ultraviolet irradiation of the fluid to be treated occurs. More specifically, in the ultraviolet irradiation device, a shaft for reciprocating the cleaning brush is disposed on the central axis of the cylindrical treatment tank, and a plurality of ultraviolet lamps are inserted into the lamp protection tube at equal intervals around the shaft. By arranging them, the treatment fluid is evenly irradiated with ultraviolet rays.
On the other hand, in the conventional configuration, since the tube body containing the magnetic sensor is arranged at any lamp protection tube position, the symmetry of the arrangement of the ultraviolet lamps collapses and unevenness in ultraviolet irradiation occurs. Become. In addition, it is conceivable to arrange a tube body that houses the magnetic sensor on the central axis of the processing tank, but then, the shaft that drives the cleaning brush needs to be disposed at a position that is shifted from the center of the processing tank. There is a problem that the drive mechanism becomes complicated.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an ultraviolet irradiation device that can detect the position of a cleaning brush in a non-contact manner without causing uneven irradiation of ultraviolet rays.

In order to achieve the above object, according to the present invention, a plurality of ultraviolet lamps are inserted into a protective tube around the central axis of the treatment tank and arranged at equal intervals, and the ultraviolet rays of these ultraviolet lamps are irradiated to the treatment tank. In the ultraviolet irradiation apparatus that performs ultraviolet treatment on the injected fluid to be treated, the ultraviolet irradiation apparatus includes a cleaning plate that reciprocates along the central axis to clean the surface of the protective tube of the ultraviolet lamp, and the cleaning plate has an end face of the treatment tank. A detection member is provided at a position opposite to the closing flange to be closed, and a restriction member for restricting a minimum distance between a proximity sensor that detects the proximity of the detection object of the cleaning plate to the closing flange and the closing flange. the door is provided, in the proximity sensor when said cleaning plate is moving toward the blind flange provided with said proximity sensor Characterized by stopping the cleaning plate based on the detection of the detection object.

Further, in order to achieve the above object, the present invention is to insert a plurality of ultraviolet lamps around a central axis of the processing tank into a protective tube and arrange them at equal intervals, and by irradiating these ultraviolet lamps with ultraviolet rays, In the ultraviolet irradiation apparatus that performs ultraviolet treatment on the fluid to be treated injected into the substrate, the apparatus includes a cleaning plate that reciprocates along the central axis and cleans the surface of the protective tube of the ultraviolet lamp. A proximity sensor for detecting the proximity of the cleaning plate is embedded and fixed at a position corresponding to the stop position of the cleaning plate, and a minimum distance between the cleaning plate and a closing flange for closing the end face of the processing tank is regulated. the regulating member for providing movement of said cleaning plate based on the detection of the cleaning plate according to the proximity sensor Characterized in that it stop.

  The present invention is also characterized in that, in the ultraviolet irradiation apparatus, the proximity sensor is screwed into a resin sensor holder that is fitted into and fixed to the closing flange or a mounting hole provided on a peripheral surface of the processing tank. And

  According to the present invention, since the proximity sensor for detecting the object to be detected of the cleaning plate in a non-contact manner is provided in the closing flange for closing the end surface of the processing tank, the proximity sensor is provided in parallel with the ultraviolet lamp in the processing tank. Compared to the conventional configuration, there is no occurrence of uneven irradiation of ultraviolet rays, and uneven sterilization ability can be prevented.

It is a front view of the ultraviolet irradiation device concerning a 1st embodiment of the present invention. It is sectional drawing of the same ultraviolet irradiation device. It is a top view of the ultraviolet irradiation device. It is a top view of a cleaning plate. It is a figure which shows the structure of the proximity sensor unit fixed to the closing flange. It is a figure which shows the proximity sensor unit which concerns on 2nd Embodiment. It is a figure which shows the structure of the ultraviolet irradiation device which concerns on 3rd Embodiment. It is a figure which expands and shows the proximity sensor unit of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a front view showing a configuration of an ultraviolet irradiation device 1 according to the present embodiment, FIG. 2 is a cross-sectional view of the ultraviolet irradiation device 1, and FIG. 3 is a plan view of the ultraviolet irradiation device 1.
The ultraviolet irradiation device 1 is provided in a water purification plant, and is used as a device that sterilizes (disinfects) purified water after water purification treatment and inactivates chlorine-resistant pathogenic microorganisms. As shown in FIG. 1 to FIG. 3, this ultraviolet irradiation device 1 has a cylindrical processing tank 2 that constitutes a body part of a housing, and a state in which the processing tank 2 is set up by an installation tool (not shown). Or it is installed in the state where it was laid down horizontally.

  The processing tank 2 is made of, for example, stainless steel, and the opening 3 at the upper end thereof is closed by a closing flange 4. A water inlet flange 7 is connected to the opening 5 at the lower end of the treatment tank 2, and a lead-out port 8 is disposed on the peripheral surface on the upper end side of the treatment tank 2. The water inlet flange 7 is connected to a pipe for introducing purified water after the water purification treatment to the treatment tank 2, and the purified water before sterilization has a predetermined flow rate (or flow pressure) through the pipe and the water inlet flange 7. The liquid is introduced into the processing tank 2 while being maintained, and is discharged upward from the outlet port 8 through the processing tank 2 by the fluid pressure.

  As shown in FIGS. 2 and 3, the treatment tank 2 is provided with an elongated cylindrical protective tube 10 into which an ultraviolet lamp 12 (described later) is inserted. The protective tube 10 is supported by a support fitting 13 having a lower end fixed to a support 9 provided at the lower end of the processing tank 2 and an upper end inserted through the closing flange 4, so that the flow pressure in the processing tank 2 is increased. Holds with enough strength to withstand. The protective tube 10 is made of quartz glass having good ultraviolet transmittance, and its surface is covered with a fluorine-based resin. The coating of the fluororesin prevents the fragments from scattering at the time of breakage. In addition, by using a fluorine-based resin for covering the protective tube 10, deterioration of the coating due to ultraviolet rays is prevented.

  Six protective tubes 10 are provided in the treatment tank 2, and these protective tubes 10 are equally spaced on a circumference P around the central axis O of the treatment tank 2 as shown in FIG. 3. Has been placed. A straight tube type ultraviolet lamp 12 extending from the lower end to the upper end of the treatment tank 2 (at least to a position beyond the outlet port 8) is inserted and fixed in each of the protective tubes 10. The number of protective tubes 10 need not be six.

  Then, each of the ultraviolet lamps 12 emits ultraviolet rays, so that purified water (fluid to be treated) flowing through the treatment tank 2 from the water inlet flange 7 toward the outlet port 8 is irradiated with ultraviolet rays and sterilized. At this time, the ultraviolet lamp 12 extends from the lower end of the treatment tank 2 to a position beyond the outlet port 8, so that ultraviolet rays are irradiated over the entire flow path from the water inlet flange 7 to the outlet port 8, and the sterilizing ability of the apparatus. Has been increased. Furthermore, since the ultraviolet ray lamp 12 is uniformly arranged around the central axis O of the treatment tank 2 in the treatment tank 2, the purified water flowing through the treatment tank 2 is uniformly irradiated with ultraviolet rays without irradiation unevenness, As a result, unevenness in the sterilization ability in the treatment tank 2 is prevented.

  As shown in FIGS. 3 and 4, three measurement ports 14 are arranged at equal intervals on the outer peripheral surface of the processing tank 2. Each of the measurement ports 14 is provided with an ultraviolet sensor unit 16 (FIGS. 2 and 4) for detecting ultraviolet intensity, and the ultraviolet intensity inside the processing tank 2 is measured by these three ultraviolet sensor units 16. ing. The operator or the like determines a decrease in the radiation intensity of the ultraviolet lamp 12 based on the measurement result, and replaces the ultraviolet lamp 12.

By the way, when dirt such as scale adheres to the surface of the protective tube 10 containing the ultraviolet lamp 12 and the ultraviolet transmittance of the protective tube 10 decreases, the sterilizing ability of the ultraviolet irradiation device 1 also decreases. Therefore, the ultraviolet irradiation device 1 is provided with a cleaning mechanism 20 that cleans the surface of the protective tube 10. By the cleaning mechanism 20, for example, the protective tube 10 is periodically removed at a frequency of one to several times a day. The surface is cleaned.
As shown in FIG. 2, the cleaning mechanism 20 includes a cleaning plate 21 disposed in the processing tank 2 and a drive mechanism 22 that reciprocates the cleaning plate 21 in the processing tank 2.

FIG. 4 is a diagram showing a cross section taken along the line AA in FIG.
As shown in FIG. 4, the cleaning plate 21 has an inner diameter approximately the same as the outer diameter of the protective tube 10, and an annular cleaning brush (cleaning brush) 24 into which the protective tube 10 is inserted, and the cleaning brush 24. And a support frame 28 that supports the brush support 26 at the same height around the central axis O of the processing tank 2 at the same height.

As shown in FIG. 2, the drive mechanism 22 includes a ball screw 30 extending on the central axis O of the processing tank 2, a ball screw nut 32 screwed into the ball screw 30 and connected to the cleaning plate 21, and a central axis O. Three guide shafts 33 arranged at equal intervals and extending vertically, a motor 34 disposed on the closing flange 4, and a transmission mechanism 36 for transmitting the rotational driving force of the motor 34 to the ball screw 30 for rotation. It has.
The support frame 28 fixes each brush support 26, and also has a ring-shaped frame 28A provided with a shaft bearing 33A for receiving the guide shaft 33, and a plurality of supports that support the ring-shaped frame 28A by extending radially from the ball screw nut 32. It is comprised with the support rod 28B of a book. Since there is a gap between the ring-shaped frame 28A and the support rod 28B, the fluid pressure applied to the support frame 28 is suppressed.

  When the ball screw 30 is rotationally driven by the motor 34, the cleaning plate 21 connected to the ball screw 30 by the ball screw nut 32 moves up and down while being guided by the guide shaft 33 in the processing tank 2. Then, as the cleaning plate 21 moves, each cleaning brush 24 wipes the outer peripheral surface of the protective tube 10 so that the protective tube 10 is cleaned.

  The cleaning plate 21 waits at least outside the outlet port 8 (between the outlet port 8 and the closing flange 4) in the vicinity of the upper end of the processing tank 2 so as not to cause a shadow during non-cleaning. . When cleaning the protective tube 10, the motor 34 rotates the ball screw 30 so that the cleaning plate 21 moves in the processing tank 2. At this time, drive control of the motor 34 is performed based on an instruction of the control circuit 40 shown in FIG.

  The control circuit 40 includes a motor drive circuit 41 that drives the motor 34, and defines the relationship between the rotational speed of the motor 34 and the time until the cleaning plate 21 reaches the lower end of the processing tank 2 from the standby position. The arrival time data 42 is stored in advance. The control circuit 40 drives the motor 34 to start moving the cleaning plate 21 from the standby position every day or every predetermined number of days, and the arrival time data 42 and the rotation of the motor 34 are rotated. Based on the speed, the timing at which the cleaning plate 21 reaches the lower end position is calculated. Then, the control circuit 40 stops the motor 34 at the timing when the cleaning plate 21 reaches the lower end position, reversely rotates it, and moves the cleaning plate 21 from the lower end position toward the standby position. The timing at which the cleaning plate 21 reaches the lower end of the processing tank 2 may be calculated based on the number of rotations of the motor 34 until the cleaning plate 21 reaches the lower end of the processing tank 2 from the standby position.

  The arrival of the cleaning plate 21 at the standby position is detected not by the control based on the arrival time data 42 but by the proximity sensor unit 50. Even if an error occurs in the position control based on the arrival time data 42, every time, The cleaning plate 21 can be returned to a fixed standby position. As shown in FIG. 3, the proximity sensor unit 50 is provided on the closing flange 4 of the processing tank 2, and the structure of the proximity sensor unit 50 will be described in detail below.

FIG. 5 is a view showing the structure of the proximity sensor unit 50 fixed to the closing flange 4.
A sensor mounting hole 51 as a through hole is provided in the closing flange 4, and the proximity sensor unit 50 is fitted and fixed in the sensor mounting hole 51. The proximity sensor unit 50 is roughly provided with a sensor holder 53 and a proximity sensor 60.
The sensor holder 53 is a member that holds the proximity sensor 60 in the closing flange 4, and has a bottomed cylindrical shape having a trunk portion 53 </ b> B having a depth such that the lower surface 53 </ b> A is flush with the lower surface 4 </ b> A of the closing flange 4. It is a member and is fitted in the sensor mounting hole 51, and the opening edge 53C is fixed to the upper surface of the closing flange 4 with a pressing metal fitting bolted. Further, a packing 57 for preventing the permeation of purified water is provided on the peripheral surface of the sensor mounting hole 51.

  The sensor holder 53 is formed of a hard resin so as not to disturb the detection sensitivity of the proximity sensor 60, and the lower surface 4A is coated with a fluorine-based resin to prevent deterioration due to ultraviolet rays. Further, a female thread is cut on the inner peripheral surface 54 of the sensor holder 53, and a proximity sensor 60 having a trunk portion 60A in which a male screw screwed into the female screw is cut on the peripheral surface is screwed and fixed to the trunk portion 53B. ing. In this way, by fixing the proximity sensor 60 to the sensor holder 53 with a screwing structure, the lower surface 53A of the sensor holder 53 is thinned to such an extent that the sensitivity of the proximity sensor 60 is not hindered. The proximity sensor 60 that is firmly coupled to the body portion 53B supplements the pressure resistance of the lower surface 53A. Instead of the configuration in which the sensor holder 53 is coated with a fluorine resin, the sensor holder 53 itself may be formed of a fluorine resin.

  The proximity sensor 60 is a sensor that detects that the cleaning plate 21 has approached without contact, and a high-frequency oscillation type sensor that uses electromagnetic induction is preferably used. More specifically, the proximity sensor 60 generates a high-frequency magnetic field by a built-in detection coil (not shown), and the cleaning plate 21 has a metal rod 71 that is a detection rod at a position facing the proximity sensor 60. Is set up with a lock nut 72 toward the proximity sensor 60. When the metal rod 71 of the cleaning plate 21 approaches the high-frequency magnetic field generated by the detection coil of the proximity sensor 60, an induced current is generated in the detection coil of the proximity sensor 60 and the impedance of the detection coil changes due to this approach. Oscillation stops, and the proximity of the cleaning plate 21 is thereby detected.

  The proximity sensor 60 of the present embodiment uses a so-called shield type sensor in which the side surface of the body portion 60A including the detection coil is covered with metal, and can be used by being embedded in the closing flange 4 that is a lump of metal. It is like that. Note that the proximity sensor 60 is not limited to the shield type, and a so-called non-shield type sensor in which the side surface of the body portion 60A including the detection coil is not covered with metal can also be used. However, in this case, since it is easily affected by surrounding metal, the body portion 53b of the sensor holder 53 is deepened so that the bottom surface 60B of the proximity sensor 60 protrudes from the lower surface 4A of the closing flange 4 into the processing tank 2. Is preferred.

  In the proximity sensor 60, the sensitivity of the proximity sensor 60 and the length of the metal bar 71 are defined in advance so that the position when the proximity of the metal bar 71 is detected becomes the standby position of the cleaning plate 21. When the proximity sensor 60 detects the approach of the metal rod 71, it outputs a detection signal to the control circuit 40, and the control circuit 40 detects the return of the cleaning plate 21 to the standby position based on this detection signal. Then, the motor drive circuit 41 is stopped and the cleaning by the cleaning plate 21 is finished.

  As shown in FIG. 5, a mechanical stopper 65 is provided on the lower surface 4 </ b> A of the closing flange 4. The mechanical stopper 65 is a rod-shaped member that extends from the lower surface 4A of the closing flange 4 toward the cleaning plate 21 by a predetermined length, whereby the minimum distance between the closing flange 4 and the cleaning plate 21 is restricted, and the cleaning plate 21 is prevented from colliding with the closing flange 4 beyond the standby position.

Thus, according to the present embodiment, the metal rod 71 is erected on the cleaning plate 21 at a position facing the closing flange 4 that closes the end surface of the processing tank 2, and the metal rod of the cleaning plate 21 is disposed on the closing flange 4. When the proximity sensor 60 for detecting the proximity of 71 is provided and the cleaning plate 21 is moving toward the closing flange 4 provided with the proximity sensor 60, the cleaning plate 21 is detected based on the detection of the metal rod 71 by the proximity sensor 60. Is configured to stop.
With this configuration, it is not necessary to provide the proximity sensor 60 in the processing tank 2 along with the ultraviolet lamp 12, so that uneven irradiation of ultraviolet rays does not occur and uneven sterilization ability can be prevented. Furthermore, since the ball screw 30 for driving the cleaning plate 21 can be disposed on the central axis O of the processing tank 2, the driving mechanism is not complicated.

  Further, according to the present embodiment, since the mechanical stopper 65 that restricts the minimum distance between the closing flange 4 and the cleaning plate 21 is provided, the cleaning plate 21 is prevented from colliding with the closing flange 4 beyond the standby position. it can.

  According to the present embodiment, since the proximity sensor 60 is screwed into the resin sensor holder 53 that is fitted and fixed in the sensor mounting hole 51 provided in the closing flange 4, the lower surface 53A of the sensor holder 53 is placed in proximity. As a result of reducing the sensitivity of the sensor 60 to such an extent that the sensitivity of the sensor 60 is not impaired, the withstand pressure of the lower surface 53A can be compensated for by the proximity sensor 60 firmly coupled to the sensor holder 53 even if the sensor 60 cannot withstand the water pressure.

[Second Embodiment]
In the first embodiment, in the structure for fixing the proximity sensor 60 to the closing flange 4, the bottomed cylindrical resin sensor holder 53 is used. On the other hand, this embodiment demonstrates the case where a metal sensor holder is used.
FIG. 6 is a diagram illustrating the proximity sensor unit 150 according to the present embodiment. In addition, in the same figure, the same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description. In the present embodiment, the mechanical stopper 65 described in the first embodiment is provided on the cleaning plate 21.

As shown in this figure, the proximity sensor unit 150 includes a cylindrical sensor holder 153 having both ends opened by metal and the proximity sensor 60.
The sensor mounting hole 151 of the closing flange 4 is formed with a piece 4B that receives the sensor holder 153 at the opening on the lower surface 4A side to prevent the drop off, and the piece 4B and the sensor holder 153 are watertight. An O-ring 154 to maintain is provided.
The sensor holder 153 is threaded into the outer peripheral surface of a thread that is screwed into the inner peripheral surface of the sensor mounting hole 151 of the closing flange 4, and is screwed into the sensor mounting hole 151, and is locked by a lock nut 156. 4 is firmly fastened. The proximity sensor 60 is screwed into the sensor holder 153 and is firmly fastened by a lock nut 157, whereby the proximity sensor 60 is fixed to the closing flange 4. At this time, on the bottom surfaces of the sensor holder 153 and the proximity sensor 60, a waterproof sheet 158 that is less deteriorated by ultraviolet rays, such as a fluororesin sheet, is provided to prevent water from entering between the proximity sensor 60 and the sensor holder 153. Has been.

  According to this embodiment, since the proximity sensor 60 is fixed to the cylindrical sensor holder 153 whose bottom is opened, the metal rod 71 of the cleaning plate 21 can be detected with high sensitivity.

[Third Embodiment]
In 1st and 2nd embodiment, the structure which provides the proximity sensor 60 in the closing flange 4 which closes the end surface of the process tank 2 was illustrated. On the other hand, in this embodiment, the structure which provides the proximity sensor 60 in the surrounding surface of the processing tank 2 is demonstrated.
FIG. 7 is a diagram illustrating a configuration of the ultraviolet irradiation apparatus 200 according to the present embodiment. In addition, the same code | symbol is attached | subjected about the member demonstrated in 1st and 2nd embodiment in the figure, and the description is abbreviate | omitted.
As shown in this figure, in the ultraviolet irradiation device 200 of the present embodiment, the introduction port 202 for introducing purified water into the treatment tank 2 is described on the lower end side of the outer peripheral surface of the treatment tank 2 and in the first embodiment. The lead-out port 8 is provided on the upper end side, and the cleaning plate 21 reciprocates between the introduction port 202 and the lead-out port 8 to clean the surface of the protective tube 10 positioned in the flow path.
Further, on the outer peripheral surface of the processing tank 2, a proximity sensor unit 250 that detects the proximity of the cleaning plate 21 to the respective positions of the outlet port 8 and the introduction port 202, that is, the standby position of the cleaning plate 21 and the reciprocating return position. Is fitted and fixed.

FIG. 8 is an enlarged view of the proximity sensor unit 250 shown in FIG.
As shown in this figure, a mounting cylinder 280 is welded to the outer peripheral surface (side surface) of the processing tank 2, and the proximity sensor unit 250 is attached and fixed to the mounting cylinder 280. The proximity sensor unit 250 includes a bottomed cylindrical hard resin sensor holder 253 similar to that of the first embodiment, and the proximity sensor 60 described in the first and second embodiments.
The sensor holder 253 is inserted into a mounting cylinder 280 having an O-ring 279 provided on the peripheral surface, and is pressed so as not to fall off by a reinforcing sleeve 284 fastened and fixed by a lock nut 282. Then, the proximity sensor 60 is screwed and fixed to the sensor holder 253, whereby the proximity sensor 60 is firmly fixed to the outer peripheral surface of the processing tank 2.

  Under this configuration, when the cleaning plate 21 is positioned beside the proximity sensor 60 (horizontal position) during cleaning of the protective tube 10, a detection signal is output from the proximity sensor 60 to the control circuit 40. Thereby, the control circuit 40 performs control such that the cleaning plate 21 is stopped by detecting that the cleaning plate 21 is located at the standby position and the folding position.

  Thus, according to this embodiment, since the proximity sensor 60 is provided on the outer peripheral surface of the processing tank 2, the proximity sensor is arranged in parallel with the ultraviolet lamp 12 in the processing tank 2 as in the first and second embodiments. Compared with the conventional structure provided with 60, uneven irradiation of ultraviolet rays does not occur, and uneven sterilization ability can be prevented. Furthermore, since the ball screw 30 for driving the cleaning plate 21 can be disposed on the central axis O of the processing tank 2, the driving mechanism is not complicated.

The first to third embodiments described above show only one aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.
For example, in the first embodiment, the proximity sensor unit 250 described in the third embodiment is provided on the outer peripheral surface of the processing tank 2 corresponding to the folding position of the cleaning plate 21, and cleaning is performed based on the detection of the proximity sensor unit 250. The plate 21 may be stopped at the folding position and folded.
Of course, in the present invention, the fluid is not limited to a liquid.

DESCRIPTION OF SYMBOLS 1,200 Ultraviolet irradiation apparatus 2 Processing tank 4 Closing flange 8 Derivation port 10 Protection tube 12 Ultraviolet lamp 20 Cleaning mechanism 21 Cleaning plate 22 Drive mechanism 24 Cleaning brush (cleaning brush)
28 Support frame 30 Ball screw 34 Motor 40 Control circuit 41 Motor drive circuit 42 Arrival time data 50, 150, 250 Proximity sensor unit 51, 151 Sensor mounting hole 53, 153, 253 Sensor holder 60 Proximity sensor 65 Mechanical stopper (regulating member)
71 Metal rod (Detected object)
202 Introduction port O Center axis

Claims (3)

An ultraviolet irradiation device that inserts a plurality of ultraviolet lamps around the central axis of the treatment tank into a protective tube and arranges them at equal intervals, and ultraviolet-treats the fluid to be treated injected into the treatment tank by the ultraviolet irradiation of these ultraviolet lamps. In
A cleaning plate that reciprocates along the central axis and cleans the surface of the protective tube of the ultraviolet lamp;
The cleaning plate is provided with a detection object at a position facing a closing flange that closes an end surface of the processing tank, the proximity flange detects a proximity of the detection object of the cleaning plate, and the closing flange And a regulating member that regulates the minimum distance between
An ultraviolet irradiation apparatus, wherein when the cleaning plate is moving toward a closing flange provided with the proximity sensor, the cleaning plate is stopped based on detection of the detected object by the proximity sensor. An ultraviolet irradiation device that inserts a plurality of ultraviolet lamps around the central axis of the treatment tank into a protective tube and arranges them at equal intervals, and ultraviolet-treats the fluid to be treated injected into the treatment tank by the ultraviolet irradiation of these ultraviolet lamps. In
A cleaning plate that reciprocates along the central axis and cleans the surface of the protective tube of the ultraviolet lamp;
A proximity sensor for detecting the proximity of the cleaning plate is embedded and fixed on the peripheral surface of the processing tank at a position corresponding to the stop position of the cleaning plate, and the end surface of the processing tank is closed on the cleaning plate. An ultraviolet irradiating device, characterized in that a restricting member for restricting a minimum distance from the closing flange is provided, and movement of the cleaning plate is stopped based on detection of the cleaning plate by the proximity sensor. The ultraviolet ray according to claim 1 or 2, wherein the proximity sensor is screwed into a resin sensor holder that is fitted and fixed in an attachment hole provided in a peripheral surface of the closing flange or the processing tank. Irradiation device.

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