JP2008002956A - Washing apparatus and water quality meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing apparatus for enhancing washing force, by allowing fine droplets of a liquid to impinge against a washing target and to increase the peeling force of the pollutant of the washing target, and a water quality meter, loaded with the washing apparatus so as to realize long-term continuous measurement. <P>SOLUTION: The washing apparatus 1 has an air jet part 31 for ejecting supplied compressed air and a nozzle 32 for receiving the supply of a liquid to be inspected from its one end and allowing the liquid to be inspected, to flow the opening part provided to its other end and is equipped with the fluid jet part 3, constituted so that the opening part of the nozzle 32 communicates with the jet flow channel of the air jet part 31; the liquid to be inspected is sucked from the opening part of the nozzle 32 by the ejection of compressed air and aspirator action, to be formed into liquid droplets; and a compressed fluid, comprising liquid droplets-containing compressed air, is jetted to the washing target. The water quality meter is mounted with such a washing apparatus. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cleaning device that cleans an object to be cleaned in a test liquid, and a water quality meter equipped with the cleaning device.

  As an example of the object to be cleaned in the test liquid, for example, a detection unit that is immersed in a test liquid such as industrial water or river water and detects the property of the test liquid can be mentioned. The detection part in the test liquid adheres to pollutants contained in the test liquid over time (for example, microorganisms if the test target is a river, lake, sewage, or drainage test liquid), and the detection capability Will deteriorate. Therefore, it is necessary to perform maintenance work to maintain such detection capability by cleaning such a detection unit every certain period of time. In such cleaning of the detection unit, it is particularly necessary to avoid missing data, and thus the detection unit is cleaned while being immersed in the test solution without raising the detection unit.

For example, Patent Documents 1, 2, and 3 are disclosed as conventional techniques for cleaning the detection unit in the test liquid as described above.
The prior art described in Patent Document 1 is that a cleaning nozzle for cleaning a measurement cell is arranged around the measurement cell, and a nozzle spray solution is sprayed from the cleaning nozzle to the measurement cell together with a pressurized gas for cleaning. .
The prior art described in Patent Document 2 excludes the water to be measured from the measurement cell by introducing pressurized air or pressurized washing water except when measuring by the sensor, and the sensor detection unit becomes the water to be measured. By reducing the chance of touching, the sensor will be less contaminated and long-term continuous measurement will be possible.
In the prior art described in Patent Document 3, a cleaning fluid (for example, water) passes through the probe head slits vigorously and is jetted into each optical window in this state. The windows are cleaned.

In general, conventional techniques for cleaning the detection unit include, for example, chemical cleaning, air cleaning, ultrasonic cleaning, water jet cleaning, and wiping cleaning.
The chemical cleaning is a method in which a chemical solution is ejected from a nozzle provided in the vicinity of the detection unit to remove contamination on the detection unit.
Air cleaning is a method of removing dirt from the detection unit by ejecting compressed air from a nozzle provided in the vicinity of the detection unit. Furthermore, this air cleaning is classified into a simple spraying method in which compressed air is continuously blown and a pulse jet method in which the supply and stop of high-pressure compressed air are repeated in a pulsed manner.

The ultrasonic cleaning is a method of removing dirt from the detection unit by irradiating the detection unit with ultrasonic waves.
Water jet cleaning is a method of removing dirt from a detection unit by jetting water from a nozzle provided in the vicinity of the detection unit.
Wiping and cleaning is a method in which dirt on the detection unit is removed directly by contact using, for example, a wiper mechanism.

Japanese Utility Model Publication No. 63-159753 (Fig. 1) Japanese Patent Application Laid-Open No. 7-167853 (paragraph numbers 0019, 0023, FIG. 1) Japanese Unexamined Patent Publication No. 2000-206106 (paragraph number 0025, FIGS. 1 and 2)

  Although the cleaning effect of chemical cleaning is high, it is not possible to introduce chemical cleaning at all sites because there are restrictions on the use of chemicals for the detection unit that performs water quality detection. Therefore, an effective cleaning method as an alternative to chemical cleaning has been studied. The reason why there are various types of cleaning methods as described above is the result of selecting those that can provide a cleaning effect according to the contamination status.

Of these, air cleaning is considered as a method having a low influence on the properties of the test liquid and a high cleaning power. In this air cleaning method, dirt adhering to the detector is mechanically removed by the compressed gas injection force, but in the simple spray method, there is an upper limit on the increase in air pressure and there is a limit on the increase in injection force. It was difficult to obtain a good peeling force, and there was a limit to improving the cleaning power.
In addition, the pulse jet type improves this point, and can generate a strong peeling force even in an instant, thus increasing the cleaning power. However, since a strong peeling force is generated only for a moment, it is difficult in principle to continuously apply this force, and there is a limit to improving the cleaning power.

  In addition, when pollutants are firmly attached to the detection unit to be cleaned and cannot be cleaned, the detection unit will be lifted and cleaned by contact cleaning, resulting in missing data during the cleaning period. There was a problem to do. There was a request to improve the cleaning power so as not to cause missing data.

  Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to apply a fine droplet of liquid to the object to be cleaned and to increase the peeling force of the pollutant to be cleaned. It is an object of the present invention to provide a cleaning device that improves the cleaning power and a water quality meter that is equipped with such a cleaning device and realizes long-term continuous measurement.

In order to achieve the above object, a cleaning apparatus according to claim 1 of the present invention includes:
A cleaning device that removes contaminants adhering to the cleaning target in contact with the test liquid,
A gas injection unit that injects the supplied compressed gas, and a nozzle through which the liquid is supplied from one end and the liquid flows to the opening at the other end, and the nozzle opening is an injection flow path of the gas injection unit It is characterized by comprising a fluid ejecting section that injects a compressed gas and ejects a liquid from the opening of the nozzle into a droplet shape, and ejects a compressed fluid containing the droplet onto the object to be cleaned.

Moreover, the cleaning apparatus according to claim 2 of the present invention includes:
The cleaning device according to claim 1,
The nozzle is characterized by injecting a test liquid from an opening at one end and ejecting a compressed fluid containing droplets of the test liquid.

A cleaning device according to claim 3 of the present invention is
The cleaning device according to claim 1,
The nozzle is supplied with water or a cleaning liquid from one end, and jets a compressed fluid containing droplets of water or the cleaning liquid.

A cleaning device according to claim 4 of the present invention is
In the cleaning apparatus according to any one of claims 1 to 3,
The gas injection section is an annular flow path formed by coaxially arranging the nozzles in the injection flow path, and the opening of the nozzle is disposed in the vicinity of the inside of the opening of the injection flow path. The fluid ejecting section communicates with a path, and the fluid ejecting section ejects a compressed gas from the annular flow path and sucks a liquid from an opening of a central nozzle to form a droplet, and ejects a compressed fluid containing the droplet. It is characterized by.

The water quality meter according to claim 5 of the present invention is:
A detection unit as a cleaning target that comes into contact with the test liquid and obtains a detection signal about the property of the test liquid;
The cleaning apparatus according to any one of claims 1 to 4, wherein the detection unit is cleaned.
It is characterized by providing.

The water quality meter according to claim 6 of the present invention is
The water quality meter according to claim 5,
The detector is
A light-emitting unit connected to the light-emitting unit and irradiating the test liquid with light;
A light receiving unit that is connected to the light receiving unit and receives light from the light emitting unit that has passed through the test solution; and
With
The cleaning device cleans each of the light emitting unit and the light receiving unit.

  According to the present invention described above, a cleaning device that improves the cleaning power by increasing the peeling force of the pollutant to be cleaned, and a cleaning device that is designed to hit a liquid droplet against the cleaning target. It is possible to provide a water quality meter that is equipped with a device and realizes long-term continuous measurement.

  Next, the best mode cleaning apparatus and water quality meter for carrying out the present invention will be described collectively with reference to the drawings. FIG. 1 is a configuration diagram of a water quality meter according to the present embodiment, FIG. 2 is a configuration diagram of a sensor unit, and FIG. 3 is a configuration diagram of a cleaning device. 1-3, illustration of fastening parts, such as a screw, is abbreviate | omitted in order to avoid complication of a figure. The water quality meter 1000 is used in test liquids such as seas (inner bays, coasts, etc.), lakes, dam water, rivers, etc. that require water quality inspection. The configuration of the water quality meter 1000 is roughly divided into a sensor unit 10, a bushing 11, a sealing unit 12, a lid unit 13, an introduction base unit 14, a terminal unit 15, a cord 16, a substrate 17, a joint 18, a joint 19, and an air. A tube 20, a joint 21, a light receiving unit accommodation case 22, a light emitting unit accommodation case 23, a power source 24, a cord 25, and a lid 26 are provided.

Then, the structure of the water quality meter 1000 is demonstrated roughly.
The sensor unit 10 irradiates the test solution with ultraviolet rays, and measures the concentration of organic pollutants in water from the absorbance of the ultraviolet rays. Specifically, as shown in FIG. 2, the sensor unit 10 includes a sensor base unit 100, a detection space 101, a light emitting unit side rod lens 102, a light source lamp 103, a socket 104, a lamp base 105, a light receiving unit side rod lens 106, The optical base 107, the half mirror 108, the 1st light-receiving part 109, the 2nd light-receiving part 110, the connection cord 111, the seal | sticker 112, and the washing | cleaning apparatus 1 are provided.

The sensor base part 100 is a base in which holes and the like are formed so that each part can be attached.
The detection space 101 is formed as a space recessed in the sensor base 100 so that the test liquid is introduced. Although the sensor base 100 is notched in the drawing, the side surface of the detection space 101 is reinforced with side walls and side columns (not shown) that connect the upper and lower sides of the sensor base 100 in order to increase the mechanical strength. It may be formed.

The light emitting portion side rod lens 102 is a light emitting portion that is connected to a light emitting unit (described later) and irradiates the test solution with light by ultraviolet rays, and is disposed in a hole of the sensor base portion 100.
The light source lamp 103 is optically connected so that the optical axis of the irradiating portion coincides with the optical axis of the light emitting portion side rod lens 102, and the light from the light source lamp 103 passes through the light emitting portion side rod lens 102. The test solution is irradiated.

The socket 104 performs electrical connection with the light source lamp 103.
The lamp base 105 fixes the light source lamp 103 and the socket 104 together. Further, the light source lamp 103 and the socket 104 can be easily positioned when fitted into the sensor base unit 100.

The light receiving portion side rod lens 106 is a light receiving portion that is connected to a light receiving unit (described later) and receives light from the light emitting portion side rod lens 102 (light emitting portion) that has passed through the test solution. It is embedded and arranged. The light emitting portion side rod lens 102 and the light receiving portion side rod lens 106 face each other with their optical axes aligned.
The optical base 107 is formed with an optical path 107a, and the half mirror 108, the first light receiving unit 109, and the second light receiving unit 110 are positioned and held on the optical path 107a.
The half mirror 108 splits the light incident through the light receiving unit side rod lens 106 into the upper side and the left side as shown in FIG. The light enters the first light receiving unit 109 and the second light receiving unit 110.

  The first light receiving unit 109 is fixed to the optical base 107 and arranged on the left side. The first light receiving unit 109 receives the light reflected on the left side by the half mirror 108 and outputs a detection signal proportional to the light intensity. The first light receiving unit 109 is electrically connected to the substrate 17, and the detection signal is output to a signal processing unit mounted on the substrate 17.

  The second light receiving unit 110 is fixed to the optical base 107 and arranged on the upper side, receives the light transmitted upward by the half mirror 108, and outputs a detection signal proportional to the light intensity. The second light receiving unit 110 is electrically connected to the substrate 17 via the connection cord 111, and the detection signal is output to the signal processing unit mounted on the substrate 17.

The seal 112 is, for example, an O-ring disposed on the outer periphery of the sensor base unit 100 and seals the sensor base unit 100 and the light receiving unit accommodation case 22. Similarly, the sensor base unit 100 and the light emitting unit housing case 23 are sealed. This prevents the test liquid from flowing into the interior.
In the present embodiment, the cleaning device 1 is integrally formed with the sensor unit 10. Details of the cleaning device 1 will be described later. The sensor unit 10 is like this.

Returning to the water quality meter 1000 shown in FIG. 1, the bushing 11 is disposed at a position where a signal cable (not shown) of the sealing portion 12 is introduced, and mechanically reinforces the signal cable so as not to be bent excessively. The water quality meter 1000 can be used even in a test solution with a flow such as a river or the sea.
The sealing portion 12 is disposed at a connection portion between the signal cable (not shown) and the terminal portion 15 in the lid portion 13 so that the test liquid does not enter the connection portion between the signal cable and the terminal portion 15.

The lid portion 13 is a disc in which two holes for projecting the terminal portion 15 and the joint 18 are formed, and is fixed to the upper side of the introduction base portion 14. The terminal portion 15 and the joint 18 are sealed from the outside by a hole in the lid portion 13.
The introduction base portion 14 is a rotating body that holds the terminal portion 15 and the joint 18, and is fixed to the opening on the upper side of the light receiving unit accommodation case 22. A signal is introduced through the terminal portion 15, and compressed air, which is a specific example of compressed gas, is introduced through the joint 18.
The terminal portion 15 is electrically connected to the signal cable and is fixed to the introduction base portion 14.

The cord 16 is electrically connected to the terminal portion 15.
The substrate 17 is electrically connected to the cord 16. A signal processing circuit (not shown) is mounted on the substrate 17, and the first light receiving unit 109 mounted on the substrate 17 shown in FIG. 2 and the second light receiving unit 110 connected via the connection cord 111 each have a signal. Connected to the processing circuit, the detection signals from the first light receiving unit 109 and the second light receiving unit 110 are subjected to signal processing such as amplification, and transmitted to the main unit (not shown) via the cord 16, the terminal unit 15, and the signal cable. The main device receives the detection signal and performs various analysis processes.

The joint 18 is connected to an air supply hose (not shown) and a flow path, and is fixed to the introduction base portion 14.
The joint 19 is connected to the joint 18 and the flow path, and is fixed to the introduction base portion 14 on the opposite side of the joint 18.
The air tube 20 is connected to a joint 19 and a flow path.

  The joint 21 is connected to the air tube 20 and the flow path, and is fixed to the sensor base unit 100 of the sensor unit 10. 2 and 3, it communicates with the air flow path 2 of the sensor base 100. Thus, the compressed air is supplied to the air flow path 2 through the air supply hose, the joint 18, the joint 19, the air tube 20, and the joint 21 (not shown). The joints 18, 19, and 21 are so-called one-touch joints and quick joints, and can easily connect the air supply hose and the air tube 20.

The light receiving unit housing case 22 is a cylinder, and the lid portion 13 and the introduction base portion 14 are arranged and fixed in the upper opening portion, and the sensor portion 10 is arranged and fixed in the lower opening portion. A light receiving unit is constituted by the light receiving unit side rod lens 106, the optical base 107, the half mirror 108, the first light receiving unit 109, the second light receiving unit 110, the connection cord 111, the substrate 17 and the like housed in the light receiving unit housing case 22. The
The light emitting unit accommodation case 23 is a cylindrical body, and the sensor unit 10 is disposed and fixed in the upper opening. The light emitting unit side rod lens 102, the light source lamp 103, the socket 104, the lamp base 105, the power supply unit 24, the cord 25, and the like housed in the light emitting unit housing case 23 constitute a light emitting unit.
The power supply unit 24 is housed in the light emitting unit housing case 23.
One of the cords 25 is electrically connected to the power supply unit 24 and the other is electrically connected to the socket 104. Power sufficient for light emission is supplied from the power supply unit 24 to the light source lamp 103 through the socket 104.
The lid 26 is a stepped disk and is fixed to the lower opening of the light emitting unit accommodation case 23.

Next, the cleaning apparatus 1 of the present invention will be described.
Specifically, as shown in FIGS. 2 and 3, the cleaning device 1 includes an air flow path 2 and a fluid ejecting unit 3. In detail, as shown in FIG. 3, the fluid ejecting unit 3 includes a gas ejecting unit 31 and a nozzle 32. The nozzle 32 further includes an injection part 321, an injection path 322, a suction part 323, an inflow path 324, and a seal 325. In FIG. 3, the reference numeral is attached only to the light emitting unit side rod lens 102 side, but the light receiving unit side rod lens 106 side has the same configuration, and the overlapping reference numerals are omitted.

The air channel 2 is a channel drilled in the sensor base unit 100 and is a basic channel extending in the vertical direction in the drawing. In addition, an ejection flow path is formed which communicates with the main flow path and faces the light emitting surface of the light emitting portion side rod lens 102 and the light receiving surface of the light receiving portion side rod lens 106 which are liquid contact portions.
Specifically, the gas injection unit 31 is an annular flow path. This annular flow path is formed by forming an annular flow path in the ejection flow path because the injection portion 321 of the nozzle 32 is coaxially arranged with the same central axis.
The injection part 321 is a cylindrical body having a small opening, and an injection path 322 is formed.
The suction portion 323 is a cylindrical body having a large diameter opening, and an inflow passage 324 is formed.

  The injection unit 321 and the suction unit 323 are connected to increase the opening area of the inflow passage 324 of the suction unit 323 and reduce the opening area of the injection passage 322 of the injection unit 321. A seal 325 is disposed between the suction part 323 of the nozzle 32 and the sensor base part 100 so that the test liquid does not enter the air flow path 2 from other than the inflow path 324.

Then, the usage method of the washing | cleaning apparatus 1 is demonstrated.
An air supply device (not shown) is operated, and compressed air is supplied to the air flow path 2 via an air supply hose, a joint 18, a joint 19, an air tube 20, and a joint 21 (not shown). This supply of compressed air is continuously supplied at a constant pressure. Then, compressed air is continuously ejected from the gas ejection part (annular flow path) 31 of the fluid ejection part 3. In FIG. 3, in order to make the drawing easier to see, the opening of the gas injection section (annular flow path) 31 is shown wide, but in practice the injection speed is increased by making it sufficiently narrow. In this case, by sending a sufficient amount of compressed air, the light emitting surface of the light emitting unit side rod lens 102 and the light receiving surface of the light receiving unit side rod lens 106 are in the compressed air air injection region 4 (solid line region in FIG. 3). It is in a covered state. Note that the air injection region 4 is not actually such a straight line, but will be described as such a region for explanation. The air injection region 4 is a region where large bubbles occupy or bubbles move at random. These light emitting surface and light receiving surface are liquid contact portions of the test liquid and are to be cleaned, but are covered with bubbles or come into contact with the boundary surface of the bubbles. In this way, compressed air is rapidly expanded in the test liquid to generate a high-speed water stream containing bubbles, and the test liquid (liquid phase) adheres to the momentum of this water stream and the contaminants adhering to the light emitting surface and light receiving surface. ) And bubbles (gas phase) are in contact with each other in a disorderly manner, and the pollutant is efficiently peeled and removed by a synergistic effect with the vibration of the pollutant.

  Further, in the fluid ejecting section 3, the opening section of the ejecting section 321 of the nozzle 32 is disposed in the vicinity of the opening section of the ejecting flow path, and from the gas ejecting section (annular flow path) 31. When the compressed air is injected, the low pressure portion 5 is formed near the outlet side opening of the injection path 322 by the principle of the aspirator, and the test liquid is sucked, and the air injection region 4 covered with large bubbles. Then, a droplet ejection region 6 (a dotted line region in FIG. 3) in which a small droplet is ejected is formed at the center. In the droplet ejection area 6, fine droplets are applied to the light emitting surface and the light receiving surface. The droplet is heavier than the previous bubble or the like and has a larger peeling force, and the contaminants adhering to the light emitting surface and the light receiving surface are peeled off.

Utilizing the momentum of the compressed air that is blown in this manner, the fluid acts as an aspirator, so that another fluid (the test liquid in this embodiment) is mixed, and a compressed fluid containing compressed air and droplets is ejected. Of this compressed fluid, the compressed air becomes large bubbles to form the air ejection region 4 and the test liquid that jumps out at the same time forms fine droplets to form the droplet ejection region 6 and collides with the object to be cleaned. Water gravel continues to hit the object to be cleaned. For this reason, even if it is compared with the state where only a soft material such as air is sprayed as in the prior art, the peeling force is strong and the cleaning power can be increased.
Further, when the droplet hits, the compressed air is also jetted, and the pollutant is blown off by the jetting force of the compressed air against the pollutant that is likely to peel off.

  In the compressed fluid injection region formed by the air injection region 4 and the droplet injection region 6 as described above, (1) the boundary between the test liquid (liquid phase) and the bubbles (gas phase) is in random contact with the object to be cleaned. (2) Peeling force generated when the droplet is applied to the object to be cleaned, (3) Peeling force due to the jet force of the compressed air is randomly generated to remove contaminants from the object to be cleaned As a result, the cleaning ability is increased.

In this embodiment, the light-receiving surfaces of the light-emitting unit side rod lens 102 and the light-receiving unit side rod lens 106 that are in contact with the test solution have a curved convex shape at the tips thereof, so that contaminants adhere to them. However, it is easy to peel off.
Therefore, further improvement of the cleaning power can be realized by the synergistic effect of the curved convex shape and the peeling effect by the compressed air and droplets according to the present invention.

  The present embodiment has been described above. In addition, although such cleaning was described as a cleaning method in which compressed air and droplets are continuously sprayed over a certain period, it is also possible to employ a pulse jet method in which spraying and pause are alternately repeated. In addition, by changing the pressure of compressed air and applying large and small bubbles, the amount and size of the bubbles that come into contact with the pollutant are changed, and the strength of the peeling force is added to remove and remove the pollutant. Also good.

  Although the inflow path 324 has been described as sucking the test liquid, instead of sucking the test liquid, one end of a tube (not shown) is connected to the inflow path 324, and a tank installed on land or on a ship is connected to the tube. It is also possible to connect to the other end of the liquid and supply pure water or a cleaning liquid from the tank to perform droplet ejection with the pure water or the cleaning liquid. In such a case, in addition to the enhancement of the peeling force, the deposits are removed by rinsing with pure water or cleaning liquid, and the cleaning power can be further increased.

Further, in the present embodiment, the liquid contact parts called the light emitting surface of the light emitting unit side rod lens 102 and the light receiving surface of the light receiving unit side rod lens 106 have been described as objects to be cleaned. However, the main object is not to limit the object to be cleaned, and liquid contact parts of various detection units for detecting water quality may be the object to be cleaned.
In the present embodiment, the compressed gas obtained by compressing air is described as an example of the compressed gas. However, other fluids that do not affect the properties of the test liquid may be employed. The compressed gas is appropriately selected.

It is a block diagram of the water quality meter of the best form for implementing this invention. It is a block diagram of a sensor part. It is a block diagram of a washing | cleaning apparatus.

Explanation of symbols

1000: Water quality meter 10: Sensor unit 100: Sensor base unit 101: Detection space 102: Light emitting unit side rod lens 103: Light source lamp 104: Socket 105: Lamp base 106: Light receiving unit side rod lens 107: Optical base 107a: Optical path 108 : Half mirror 109: first light receiving part 110: second light receiving part 111: connection cord 112: seal 11: bushing 12: sealing part 13: lid part 14: introduction base part 15: terminal part 16: code 17: substrate 18 : Joint 19: Joint 20: Air tube 21: Joint 22: Light receiving unit accommodation case 23: Light emitting unit accommodation case 24: Power supply unit 25: Code 26: Lid 1: Cleaning device 2: Air flow path 3: Fluid ejection unit 31 : Gas injection part (annular flow path)
32: Nozzle 321: Injection section 322: Injection path 323: Suction section 324: Inflow path 325: Seal 4: Air injection area 5: Low pressure section 6: Drop injection area

Claims (6)

A cleaning device that removes contaminants adhering to the cleaning target in contact with the test liquid,
A gas injection unit that injects the supplied compressed gas, and a nozzle through which the liquid is supplied from one end and the liquid flows to the opening at the other end, and the nozzle opening is an injection flow path of the gas injection unit A cleaning apparatus comprising: a fluid ejecting unit that communicates with a compressed gas and sucks a liquid from an opening of a nozzle to form a droplet, and ejects a compressed fluid containing the droplet onto a cleaning target. The cleaning device according to claim 1,
The nozzle has a test liquid flowing in from an opening at one end and ejects a compressed fluid containing droplets of the test liquid. The cleaning device according to claim 1,
The nozzle is supplied with water or a cleaning liquid from one end and ejects a compressed fluid containing droplets of water or the cleaning liquid. In the cleaning apparatus according to any one of claims 1 to 3,
The gas injection section is an annular flow path formed by coaxially arranging the nozzles in the injection flow path, and the opening of the nozzle is disposed in the vicinity of the inside of the opening of the injection flow path. The fluid ejecting section communicates with a path, and the fluid ejecting section ejects a compressed gas from the annular flow path and sucks a liquid from an opening of a central nozzle to form a droplet, and ejects a compressed fluid containing the droplet. A cleaning device characterized by. A detection unit as a cleaning target that comes into contact with the test liquid and obtains a detection signal about the property of the test liquid;
The cleaning apparatus according to any one of claims 1 to 4, wherein the detection unit is cleaned.
A water quality meter comprising: The water quality meter according to claim 5,
The detector is
A light-emitting unit connected to the light-emitting unit and irradiating the test liquid with light;
A light receiving unit that is connected to the light receiving unit and receives light from the light emitting unit that has passed through the test solution; and
With
The water quality meter, wherein the cleaning device cleans the light emitting unit and the light receiving unit, respectively.

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