JP2006258563A - Device cleaning of light projecting surface and light receiving surface of probe for detecting state of particles in treatment water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device of cleaning the light projecting surface and light receiving surface of a probe for detecting a state of particles in treatment water constituted so as to be made hart to cause not only the turbulent flow due to a washing liquid stream but also the readhesion of suspended solids. <P>SOLUTION: The device of cleaning the probe comprises the long washing liquid supply part provided to the probe having a light projecting surface for emitting a laser beam and a light receiving part for receiving a scattered beam from its light receiving surface to detect the state of the particles in the treatment water due to the laser beam and a light projecting surface jet nozzle is provided in the vicinity of the leading end of the cleaning liquid supply part in order to spray the cleaning liquid on the light projecting surface of the probe from the cleaning device so that the angle of the projection line of the cleaning liquid when the cleaning liquid is projected on the surface crossing the laser beam axis surface, which is formed by the center line of the light projecting part and light receiving surface of the probe, at a right angle is 30-60° with respect to the light projecting part and the angle of the projection line of the cleaning liquid when the cleaning liquid projected on the surface parallel to the laser beam axial surface is 40-50°. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, when purifying clean water, industrial water, etc., particle state detection used to detect the aggregation state of suspended substances (impurities) contained in the water for treatment in the aggregation treatment step by laser light. The present invention relates to an apparatus for cleaning a light projecting surface and a light receiving surface of a light probe with a cleaning liquid.

  When purifying clean water, industrial water, or the like, a coagulation process is performed in order to solid-liquid separate suspended substances contained in the water for treatment (sewage). The agglomeration treatment is performed by adding a flocculant into the treatment water. This treatment causes the suspended substances to aggregate in a floc form, and these floc particles coexist in the treated water together with the suspended substances. . The aggregated state of the particles is preferably substantially constant in order to obtain a treated water having a predetermined purified water quality by smoothly performing subsequent processing steps such as a solid-liquid separation process. It is necessary that the coagulation treatment is appropriately performed in accordance with the quality of water (pH, concentration of suspended solids).

  In order to set the optimum coagulation treatment conditions (addition amount of coagulant, stirring time, etc.), for example, a probe for detecting the particle state in the water for treatment is used (Patent Document 1). This apparatus emits laser light in the processing water (detection water), collides the laser light with floc-like particles in an aggregated state, receives the scattered light, and treats the processing water from the intensity of the received scattered light. It measures and detects the aggregation state, and it is possible to set optimum processing conditions based on this measured value.

As shown in FIG. 5, the probe 10 receives a laser beam emitting light projecting portion 11 and a laser beam LB emitted from the tip of the light projecting portion collides with particles and receives generated scattered light from the tip. The unit 12 is basically configured. When the probe is used in the processing water, the light projecting surface 11a (the surface of the glass plate) at the tip of the laser light emitting projection part and the light receiving surface 12a (the fiber end face) at the tip of the light receiving unit Suspended material adheres and the surface becomes dirty, which causes a decrease in the laser beam emission intensity at the light projecting part and an inhibition of receiving scattered light at the light receiving part, resulting in a decrease in measurement accuracy. There was a problem. For this reason, in order to remove those stains, a cleaning means 13 (for cleaning fresh air or air between the light projecting portion 11 and the light receiving portion 12 and jetting fresh water or air to the light projecting surface 11a and the light receiving surface 12a and the vicinity thereof. A probe provided with a cleaning means) has been proposed.
JP 2003-161689 A

  The cleaning means 13 is provided so that the jet outlet is brought close to the light projecting portion light projecting surface 11a and the light receiving portion light receiving surface 12a, and the ejected fresh water or air is ejected along the light projecting surface and the light receiving surface. Therefore, it is said that dirt adhering to the light projecting surface and the light receiving surface can be removed by this jet flow. However, it has been found that the cleaning means provided in the arrangement as shown in FIG. 5 has a problem that the cleaning fluid cannot be efficiently sprayed on those surfaces, and therefore, the dirt cannot be sufficiently removed. In particular, when air is used as the cleaning fluid, a part of the dirt is removed by the jet air at the start of jetting, but thereafter the detection water near the light projecting surface and the light receiving surface is almost eliminated by the jet air. Therefore, it was also found that these areas were filled with air and the dirt was less likely to be removed than expected.

  In order to solve the above problems, the applicant of the present application invented a cleaning apparatus for a particle state detection probe in processing water that can remove dirt on the light projecting surface and the light receiving surface by spraying a cleaning liquid, and has already filed a patent application. (Japanese Patent Application No. 2004-174527). In this cleaning apparatus, the light projecting surface and the light receiving surface injection nozzle are arranged so that the cleaning liquid is at an angle of 40 to 50 ° from the light projecting surface and the light receiving surface (in the laser optical axis plane connecting the center lines of the light projecting unit and the light receiving unit) Are provided to be sprayed on these surfaces at an angle). For this reason, the cleaning liquid colliding on the light projecting surface and the light receiving surface spreads out from both surfaces to both sides, and the dirt on the light projecting surface and the light receiving surface is efficiently removed by the brushing effect by the cleaning liquid flow. Can do.

The cleaning liquid sprayed from the spray nozzle of the cleaning device has a high outflow speed of up to about 200 m / s from a relatively low outflow speed of about 10 m / s at the initial speed at the outflow speed of the nozzle outlet. As described above, the jet cleaning liquid mostly flows into the right and left sides of the probe after colliding with the light projecting surface and the light receiving surface of the probe. It was found that turbulent flow was likely to occur around the surface, and as a result, suspended substances were likely to reattach to the light projecting surface and the light receiving surface. In addition, since the cleaning liquid is ejected from a position that crosses the laser beam in the laser beam axis plane, the distance from each ejection nozzle outlet to the light projecting surface and the light receiving surface is relatively long, which may cause turbulence. I also found it easy.
Accordingly, an object of the present invention is to provide a device for cleaning the light projecting surface and the light receiving surface of the particle state detection probe in the treatment water in which the turbulent flow due to the cleaning liquid flow is unlikely to occur and the suspended substance is difficult to reattach. .

The present invention provides a light projecting unit that emits laser light from a light projecting surface at the tip of the processing water and a light receiving surface at the tip of the scattered light generated by the emitted laser light colliding with particles in the water for processing. A probe cleaning device comprising a long cleaning liquid supply unit attached to a probe for detecting particle state in processing water using a laser beam having a light receiving unit that receives light from the cleaning device, the probe cleaning surface from the cleaning device In order to spray the cleaning liquid, the angle (α _{1) of the} cleaning liquid projection line when the cleaning liquid is projected onto a plane orthogonal to the laser optical axis plane formed by the center line of the light projecting portion and the light receiving portion of the probe. ) Is 30 to 60 ° with respect to the light projecting surface, and the angle (α ₂ ) of the cleaning liquid projection line when projected onto a surface parallel to the laser light axis surface is on the light projecting surface. Projection surface injection nozzle so that it is 40 to 50 ° In the cleaning apparatus having the above cleaning liquid dispenser near the tip.

In the present invention, in order to spray the cleaning liquid from the cleaning device onto the light receiving surface of the probe, the angle (β ₁ ) of the cleaning liquid projection line when the cleaning liquid is projected onto a plane orthogonal to the laser optical axis plane is The angle (β ₂ ) of the cleaning liquid projection line when projected onto a plane that is 30 to 60 ° with respect to the laser optical axis surface on the light receiving surface and parallel to the laser optical axis surface is the light receiving surface. It is preferable that the light receiving surface spray nozzle is provided in the vicinity of the tip of the cleaning liquid supply unit so that the angle is 40 to 50 °.

The cleaning device of the present invention is arranged such that the center in the longitudinal direction of the device is shifted in parallel from the laser optical axis (line passing through the center of the light projecting portion) of the probe, and the light projecting surface and the light receiving surface. Since the light projecting surface and the light receiving surface spray nozzle are provided so that the cleaning liquid can be sprayed at a specific angle, the cleaning liquid can be sprayed from the spray nozzle outlet to the light projecting surface and the light receiving surface at the shortest distance. It becomes. In addition, since most of the cleaning liquid after the collision on the light projecting surface and the light receiving surface flows out in a one-way flow by spraying the cleaning liquid from a specific angle, it is disturbed around the light projecting surface and the light receiving surface. Since the flow is difficult to occur and the flow of the suspended substance due to this is suppressed, reattachment to the light projecting surface and the light receiving surface can be prevented. Therefore, the light projecting surface and the light receiving surface can be more completely cleaned.
In addition, since the cleaning liquid can maintain a wider cleaning area than air, it can be cleaned more efficiently than air, and processing water on the light emitting and receiving surfaces by high-speed jetting of the cleaning liquid at the start of cleaning. The impact of this is less than that of air, and it is possible to reduce the wear of the glass on the light projecting surface and the fibers on the light receiving surface. Particularly for high-speed injection of cleaning liquid, the impact is further suppressed by providing a liquid pressure control means such as a surge tank or a solenoid valve before the cleaning liquid flows into the cleaning liquid supply unit. be able to.

A cleaning apparatus 1 for detecting a particle state in processing water using laser light according to the present invention (hereinafter simply referred to as a cleaning apparatus according to the present invention) will be described with reference to the accompanying drawings.
1 and 2 are schematic views showing a preferred embodiment of the cleaning device 1 of the present invention. In FIG. 1, (a) is a plan view of the cleaning device, and (b) is a front view of the cleaning device. 2A is a front view of the cleaning device, and FIG. 2B is a left side view of the cleaning device. Moreover, FIG.2 (c) is a left view of the washing | cleaning apparatus of another aspect.
As shown in FIGS. 1 and 2, the cleaning apparatus 1 of the present invention comprises a long cleaning liquid supply unit 2, and a light projecting surface injection nozzle 3, preferably a light projecting surface injection nozzle 3, near its tip. And a light receiving surface injection nozzle 4. The cleaning liquid supply unit 2 is formed in a cavity having an appropriate cross-sectional shape (circular, elliptical, or quadrangular shape) so that the cleaning liquid can flow therethrough, and the tip thereof communicates with the injection nozzles 3 and 4. Further, the end portion thereof can be connected to a cleaning liquid supply source (not shown). The shape of the cleaning liquid supply unit is not particularly limited, and may be any shape such as a prismatic type as shown in FIGS. 1 and 2 or another cylindrical type. These have a relatively high mechanical strength and are stable to chemical action, are easy to handle, and are inexpensive and can be usually produced using a synthetic resin such as plastic.

  A liquid pressure control means 5 that can control the liquid pressure of the cleaning liquid is preferably provided at the rear end of the cleaning liquid supply unit 2. Examples of the hydraulic pressure control means 5 include a surge tank as shown in FIG. 1 and a hydraulic pressure control circuit as shown in FIG. Since the liquid pressure of the cleaning liquid W sprayed from the spray nozzle can be adjusted by adjusting the solenoid valve, pressure reducer, valve, etc. incorporated in the liquid pressure control means, the processing water is thrown by the water hammer at the start of cleaning liquid spraying. The impact on the light surface and the light receiving surface can be reduced. The hydraulic pressure control circuit 5 shown in FIG. 2 is an example of a circuit divided into two (two directions), but may be configured as a circuit divided into two or more directions. In that case, a built-in solenoid valve is provided in each separate circuit.

  In the case of a bifurcated circuit as shown in FIG. 2, each circuit has an electromagnetic valve (5a, 5b), and at least one of these circuits (usually the circuit that increases the degree of pressure reduction) 5c) is provided. Control of the spray cleaning fluid pressure using the bifurcated circuit shown in FIG. 2 is performed, for example, according to the following procedure. First, the electromagnetic valve 5a is opened, and the cleaning liquid is injected at a relatively low hydraulic pressure for an appropriate time at the beginning of the start. As a result, the jetting rising flow velocity of the cleaning liquid is slowly performed, and the jetting impact on the light projecting surface and the light receiving surface of the processing water is suppressed. Next, after the electromagnetic valve 5a is released for a predetermined time, the electromagnetic valve 5b is opened in that state. In this process, the light projecting surface and the light receiving surface are substantially cleaned by the cleaning liquid.

  It is preferable that a recess 6 for blocking the progress of the laser beam LB emitted from the tip of the light projecting unit is formed at the tip of the cleaning liquid supply unit 2. Since the emitted laser light is shielded in the recess 6, the laser light is not directly received and a safe operation is possible.

  The cleaning apparatus 1 of FIG. 1 is above the center line AA of the probe 10 (line passing through the center line of each of the light projecting part and the light receiving part: normally coincides with the laser optical axis) (FIG. 1 (a)). 2), but can also be arranged below the center line AA (in the embodiment of FIG. 2, on the left side of the center line as seen in FIG. 2 (b)). But it can also be placed on the right). By disposing the cleaning device with respect to the probe from the center line of the probe as described above, the cleaning liquid is thrown from the light emitting surface injection nozzle and the light receiving surface injection nozzle obliquely with respect to the laser light emission direction of the probe. It becomes possible to spray on the light surface and the light receiving surface.

  In the cleaning liquid supply unit 2 of the cleaning device of the present invention, the light projecting surface spray nozzle 3 and the light receiving surface spray nozzle 4 are respectively sprayed onto the light projecting unit light projecting surface and the light receiving unit light receiving surface at a predetermined angle. Is provided. 3 and 4 show a state in which the cleaning liquid W ejected from the light projecting surface ejection nozzle 3 and the light receiving surface ejection nozzle 4 is sprayed onto the light projecting surface and the light receiving surface of the probe at a predetermined angle as the angle of the cleaning liquid projection line, respectively. FIG.

As shown in FIG. 3, the light projecting surface injection nozzle 3 is configured to allow the cleaning liquid W to flow with respect to a laser optical axis plane A (surface passing through the line AA) formed by the center line of the light projecting portion and the light receiving portion of the probe. angle of the cleaning liquid projection line W _B when projected onto the orthogonal on the plane B (alpha ₁₎ a is 30 to 60 ° with respect to the light projecting surface and the laser optical axis plane a plane parallel C against provided so as to be able to blow the cleaning liquid W to the light projecting surface such that the angle of the cleaning liquid projection line W _C (alpha ₂₎ is at 40 to 50 ° relative-projecting optical surface when projected above Yes. The angle (α ₁ ) is preferably 40 to 50 °, more preferably 45 ° ± 3 °, and particularly preferably 45 ° ± 1 °. The angle (α ₂ ) is preferably 45 ° ± 3 °, and particularly preferably 45 ° ± 1 °. Both the angle (α ₁ ) and the angle (α ₂ ) are preferably 40 to 50 °, more preferably 45 ° ± 3 °, and particularly preferably 45 ° ± 1 °.

Receiving surface injection nozzle 4, as shown in FIG. 4, the cleaning liquid projection line W _B in projecting the washing liquid W perpendicular to the plane B with respect to the laser optical axis plane A (plane passing through the line A-A) Angle (β ₁ ) is 30 to 60 ° with respect to the laser beam axis surface on the light receiving surface and the cleaning liquid projection line when projected onto a plane C parallel to the laser beam axis surface A W _C of the angle (beta ₂₎ is a light emitting surface provided to be able to blow the cleaning liquid W to be a 40 to 50 ° with respect to the light receiving surface. The angle (β ₁ ) is preferably 40 to 50 °, more preferably 45 ° ± 3 °, and particularly preferably 45 ° ± 1 °. The angle (β ₂ ) is preferably 45 ° ± 3 °, and particularly preferably 45 ° ± 1 °. Both the angle (β ₁ ) and the angle (β ₂ ) are preferably 40 to 50 °, more preferably 45 ° ± 3 °, and particularly preferably 45 ° ± 1 °.
The diameter of the injection nozzle depends on the size of the apparatus, but is usually in the range of 1 to 5 mm in diameter, and preferably in the range of 3 to 3.5 mm in diameter.

It is preferable that the light projecting surface spray nozzle 3 and the light receiving surface spray nozzle 4 are arranged so that most of the sprayed cleaning liquid W after the collision with the light projecting surface and the light receiving surface flows out in one direction. For example, as shown in FIG. 3, most of the cleaning liquid colliding with the light projecting surface (the vertical wall with respect to the B surface) travels along the B surface and flows out in the cleaning liquid (W ₁ ) flow direction. Is preferably arranged. As shown in FIG. 4, most of the cleaning liquid colliding with the light receiving surface (on the B surface) is located behind the light receiving surface (between the light projecting unit 11 and the light receiving unit 12 and is emitted from the light receiving unit). It is preferable that the injection nozzle 4 is disposed so as to travel along the B surface and flow out in the flow direction of the cleaning liquid (W ₂ ) after colliding with the laser light receiving prevention partition wall to become the cleaning liquid W ₁ . It is possible to suppress the occurrence of turbulent flow around the light projecting surface and the light receiving surface due to the cleaning liquid flowing out in such a unidirectional flow. In order to promote the formation of a unidirectional flow around the light projecting surface and the light receiving surface, for example, as shown in FIG. 2C, when the probe 10 and the cleaning device 1 are configured in a prismatic shape, It is preferable to provide round (R) at the corners of the probe and the cleaning device that become the flow path F (flow of the arrow in the figure).

  The liquid pressure at the time of jetting the cleaning liquid can be appropriately selected depending on the quality of the processing water and the degree of contamination on the light projecting surface and the light receiving surface, but is preferably 0.001 to 0.1 MPa at the start of jetting, More preferably, it is 0.005-0.05 MPa. The hydraulic pressure after the start is preferably 0.2 to 0.5 MPa, and more preferably 0.3 to 0.4 MPa.

  Although it does not specifically limit as a washing | cleaning liquid, It is preferable that it is a fresh water (normal tap water). Further, when alkali or the like is contained in the water for treatment, an appropriate amount of acid (for example, citric acid, formic acid, etc.) may be added as necessary.

  When using the cleaning apparatus of the present invention, it depends on the quality of the processing water and the degree of contamination, but it is cleaned for about 10 to 30 seconds per time at a rate of 2 to 5 times a day under normal use conditions. Thus, the dirt can be completely removed.

  In the cleaning apparatus 1 of the present invention, as described above, the light projecting surface injection nozzle 3, preferably any one of the light projecting surface injection nozzle 3 and the light receiving surface injection nozzle 4 is for detecting the particle state in the processing water using laser light. It is attached to the probe so that the cleaning liquid can be sprayed at a predetermined angle to the light projecting surface 11a of the probe 10, preferably both the light projecting surface 11a and the light receiving surface 12a. Therefore, the probe is not particularly limited and can be attached to any known probe.

  As shown in FIG. 1, the probe 10 includes a light projecting unit 11 for emitting laser light LB from a light projecting surface 11a at the tip thereof, and scattered light generated when the emitted laser light collides with particles. It is preferable that the light receiving unit 12 for receiving light from the light receiving surface 12a at the tip is integrally formed. The light projecting unit 11 may be constituted by an optical fiber having a predetermined length from the light projecting surface at the tip thereof, or may be directly connected to the light projecting surface at the front end and a laser oscillation light emitting diode may be installed. . In the case of an optical fiber, a laser oscillator such as a laser diode is connected to the rear end of the optical fiber. If a laser oscillation light emitting diode is used, there is no attenuation of the laser beam while traveling through the optical fiber, so that a stronger laser beam can be emitted. The light receiving unit 12 can also be configured by using a light receiving diode directly on the tip light receiving surface like the light projecting unit, but is preferably made of an optical fiber having a predetermined length.

It is a schematic diagram which shows one aspect | mode of the washing | cleaning apparatus of the probe for particle state detection in the process water by the laser beam of this invention. It is a schematic diagram which shows another one aspect | mode of the washing | cleaning apparatus of the probe for particle state detection in the process water by the laser beam of this invention. It is a schematic diagram which shows the state which injected the washing | cleaning liquid from the injection nozzle of the washing | cleaning apparatus of this invention at the predetermined angle with respect to the light projection surface of a probe. It is a schematic diagram which shows the state which injected the washing | cleaning liquid from the injection nozzle of the cleaning apparatus of this invention with the predetermined angle with respect to the light-receiving surface of a probe. It is a schematic diagram of the light projecting part, the light receiving part of the conventional probe, and the cleaning means provided between them.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cleaning apparatus 2 Cleaning liquid supply part 3 Light projection surface injection nozzle 4 Light reception surface injection nozzle 5 Fluid pressure control circuit 6 Laser beam interruption | blocking recessed part 10 Probe 11 Light projection part 11a Light projection surface (glass surface)
12 Light-receiving part 12a Light-receiving surface (fiber end surface)
13 Cleaning means LB Laser light W _B B Cleaning liquid projection line on B surface (plane perpendicular to laser light axis plane) W _C Projection line on cleaning plane (plane parallel to laser light axis plane)

Claims (7)

  A light projecting unit that emits laser light from the light projecting surface at the tip of the processing water and a light receiving device that receives from the light receiving surface at the tip the scattered light generated when the emitted laser light collides with particles in the water for processing. A cleaning device for a probe comprising a long cleaning liquid supply unit attached to a probe for detecting particle state in water for processing by a laser beam having a section for spraying the cleaning liquid from the cleaning device onto the light projecting surface of the probe Further, the angle of the cleaning liquid projection line when the cleaning liquid is projected onto a plane orthogonal to the laser optical axis plane formed by the center line of the light projecting portion and the light receiving portion of the probe is relative to the light projecting surface. So that the angle of the cleaning liquid projection line when projected onto a plane parallel to the laser beam axis is 40 to 50 ° with respect to the projection surface. Near the tip of the cleaning liquid supply section Having a cleaning device.   Further, in order to spray the cleaning liquid onto the light receiving surface of the probe from the cleaning device, the angle of the cleaning liquid projection line when the cleaning liquid is projected onto the surface orthogonal to the laser optical axis surface is the laser optical axis surface on the light receiving surface. And the angle of the cleaning liquid projection line when projected onto a plane parallel to the laser optical axis is 40 to 50 ° with respect to the light receiving surface. The cleaning apparatus according to claim 1, wherein a surface spray nozzle is provided in the vicinity of the tip of the cleaning liquid supply unit.   The angle of the cleaning liquid projection line when the cleaning liquid sprayed onto the light projecting surface is projected onto a surface orthogonal to and parallel to the laser optical axis surface is 45 ° ± 3 ° with respect to the light projecting surface. The cleaning apparatus according to claim 1.   The angle of the cleaning liquid projection line on which the cleaning liquid sprayed onto the light receiving surface is projected on a plane orthogonal to and parallel to the laser optical axis plane is 45 ° with respect to the laser optical axis plane on the light receiving surface, respectively. The cleaning apparatus according to claim 2, which is ± 3 ° and 45 ° ± 3 ° with respect to the light receiving surface.   The light projecting surface and the light receiving surface injection nozzle are arranged so that the cleaning liquid discharged after being sprayed on the light projecting surface and the light receiving surface is substantially in one direction. The cleaning apparatus according to 1.   The cleaning apparatus according to any one of claims 1 to 5, wherein a liquid pressure control means capable of suppressing the liquid pressure of the sprayed cleaning liquid is provided at a rear end portion of the cleaning liquid supply section.   The cleaning device according to any one of claims 1 to 6, wherein a recess for blocking the progress of the laser light emitted from the tip of the light projecting unit is formed at the tip of the cleaning liquid supply unit.