JP4787027B2 - Cleaning device for water quality detector - Google Patents

Description

  The present invention relates to a water quality detector cleaning device for cleaning various water quality detectors such as a pH meter, an ORP meter, and a dissolved oxygen meter.

  Water quality such as industrial water, sewage, river water, lake water or marine water needs to be continuously measured and monitored. If the pollutant contained in the sample water adheres to the detector (electrode part) during continuous measurement, the detection capability is lowered and the analysis accuracy is lowered. For this reason, it is desirable to clean an electrode part etc. with a fixed period, For example, the intermittent cleaning method and the intermittent cleaning apparatus which are described in patent document 1 are already well-known.

  The intermittent cleaning method according to Patent Document 1 includes a compressed gas injection period for injecting compressed gas from a cleaning nozzle toward a site to be cleaned, and a stop period for stopping compressed gas injection, and the compressed gas injection period The stop period is alternately repeated, and each of the compressed gas injection period and the stop period is set to approximately 0.1 to 60 seconds. In addition, a cleaning apparatus that performs this cleaning method includes a cleaning nozzle that injects compressed gas toward a target portion to be cleaned such as an electrode portion in a liquid, a compressed gas supply unit that supplies compressed gas to the cleaning nozzle, and a compressed gas A control valve that controls the supply of the control valve, a central processing unit that has a function of controlling the opening and closing operations of the control valve, and a tank that stores a predetermined amount of compressed gas as required. It has a function of opening and closing at a period of 0.1 to 60 seconds.

  According to the above prior art, when the boundary between the sample water and the bubbles contacts the pollutant adhering to the site to be cleaned, such as the electrode section, the pollutant is vibrated and efficiently removed. In addition, the cleaning power immediately after the start of cleaning can be maintained for a long period of time to perform cleaning reliably. Here, it is desirable that a large amount of the compressed gas injected from the cleaning nozzle toward the site to be cleaned is injected in a short time from the viewpoint of cleaning efficiency.

Japanese Unexamined Patent Publication No. 2005-21858 (paragraphs [0015] to [0021], [0028] to [0031], FIG. 1, FIG. 3 to FIG. 7, etc.)

Now, in the said prior art, compressed air is supplied to a washing nozzle through the tube etc. from the compressed gas supply part installed on the land. However, if the detector body is installed at a relatively deep water depth, such as a lake bottom or a sewage deep tank reaction tank, the aforementioned tube is lengthened to wash the detector from the compressed gas supply unit on land. Compressed air must be supplied to the cleaning nozzle near the target site.
For this reason, piping resistance will increase according to the length of the tube, and there has been a problem that a large amount of compressed air cannot be supplied within a short period of time and sufficient detergency cannot be obtained.
As another method, by arranging the control valve in the vicinity of the washing nozzle and the tank, it is possible to avoid an increase in piping resistance due to the extension of the tube. However, when a solenoid valve is used as the control valve, it is waterproof. It was necessary to make it a mold, and waterproofing and insulation measures were troublesome.

  To reduce the piping resistance of the tube, the inner diameter of the tube may be increased. However, the increase in the inner diameter of the tube disposed with the cleaning nozzle in the vicinity of the detector, which is generally small and light, means that the tube is flexible. As a result, the degree of freedom of installation and installation of tubes and detectors are impaired. In addition, when the large diameter tube is filled with compressed air, the buoyancy acts on the detector body, and thus a measure such as attaching a weight is required to stably install the detector body.

  Therefore, the problem to be solved by the present invention is that a compressed gas having a required pressure can be supplied to the cleaning nozzle while using a thin and long tube or the like, and without requiring a waterproof solenoid valve, and installed deep in water. Another object of the present invention is to provide a water quality detector cleaning apparatus capable of exerting a sufficient cleaning power even on the cleaning target portion of the detector body.

In order to solve the above-mentioned problems, the invention described in claim 1 is for a water quality detector that removes the pollutant adhered to the site to be cleaned that comes into contact with the sample water by the action of compressed gas ejected from the cleaning nozzle. In the cleaning device,
A compressed gas source;
A tube for supplying compressed gas from the compressed gas supply source,
A tank connected to the tube and disposed near the detector body immersed in the sample water to store compressed gas;
A valve the compressed gas is supplied is connected to the tank,
A cleaning nozzle which faces through the sample water to the washing target part disposed on the outlet side of the valve,
With
The tube is stretched along a wire supporting the detector body in sample water;
The valve is opened when the pressure of the compressed gas supplied from the tank exceeds a predetermined set pressure to inject the compressed gas from the cleaning nozzle.

  According to a second aspect of the present invention, in the water quality detector cleaning device according to the first aspect, the valve is closed when the pressure of the compressed gas supplied from the tank drops below a predetermined value. The injection is stopped.

According to the present invention, when the detector main body is installed deep in water, even if a relatively small diameter tube is used as the gas supply pipe, if the internal pressure of the tank near the detector main body is increased to a predetermined value, Thereafter, a large amount of compressed gas can be intermittently injected from the cleaning nozzle by opening and closing the valve.
For this reason, there is no possibility that the flexibility when the large-diameter tube is used or the degree of freedom of installation of the detector body will be reduced, and the installation stability may not be reduced due to the buoyancy of the compressed gas in the tube.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, FIG. 1 is a configuration diagram showing a use state of the first embodiment of the present invention, in which a water quality detector is a pH meter for detecting the pH value of sample water, for example, and the present invention is used for cleaning the electrode part. When applied.

In FIG. 1, reference numeral 10 denotes a detector body incorporating an electrode portion as a site to be cleaned, which is immersed in a sample water W such as river water or lake water whose pH value is to be measured via a wire 11. The upper end portion of the wire 11 is fixed to a brace 51 on a base 50 installed on the land G.
Further, the lead wire 12 connected to the electrode portion extends in the direction of the arm metal 51 along the wire 11, and the distal end portion thereof is connected to the converter 60 on the base 50. The converter 60 is for obtaining a measurement value by performing impedance conversion, amplification, and the like of the measurement signal by the electrode unit.

A tank 20 for storing compressed air supplied to the electrode portion is integrally attached to the side of the detector body 10, and a tube as a gas supply pipe for supplying compressed air to the tank 20. 22 is extended in the direction of the brace 51 along the wire 11 like the lead wire 12. The distal end portion of the tube 22 is connected to the pump 40 on the base 50.
The compressed gas supply source is not limited to the pump 40. For example, a cylinder containing compressed air may be used, or instrument air used in a factory or the like may be supplied via an electromagnetic valve.
Further, the tube 22 is preferably a resin tube made of soft vinyl chloride (PVC) or polytetrafluoroethylene (PTFE) from the viewpoint of flexibility, weather resistance, and durability. above, no problem even by using a non-flexible resin tube as a gas supply pipe.

A substantially J-shaped pipe 21 to which compressed air is supplied is connected to the lower end of the tank 20, and a cleaning nozzle 31 is attached to the end of the tank 20 via a valve 30.
The cleaning nozzle 31 is arranged in a direction in which the compressed air is jetted in the direction of the electrode part of the detector main body 10, and these arrangement structures will be described below with reference to FIG.

FIG. 2 is an enlarged view of a main part of FIG. The valve 30 connected to the pipe 21 is automatically activated when the pressure on the inlet side (pipe 21 side) of the valve rises and exceeds the set pressure, such as a safety valve, and the valve body opens. Thus, the compressed air is discharged instantaneously, and the valve body has a function of closing again when the pressure drops to a predetermined value. The cleaning nozzle 31 is provided on the outlet side of the valve 30, and the tip thereof faces the electrode portion 13 inside the detector body 10 with an appropriate gap.
Here, the shape of the cleaning nozzle 31 is not particularly limited. However, in order to discharge a large amount of compressed air in a short time when the valve 30 is opened, or immediately after the discharge, the internal pressure of the valve 30 is lowered all at once. In order to make sure, it is preferable not to squeeze the tip of the cleaning nozzle 31 extremely.

Next, the operation of this embodiment will be described with reference to FIG.
FIG. 3 is a timing chart showing the operation of the pump 40, the internal pressure of the valve 30 (inlet side pressure), and the operation of the valve 30.

As shown in FIG. 3, a cleaning cycle T having a predetermined length is set, and the pump 40 is turned on during the cleaning period T1, and the pump 40 is turned off during the other period T2 to measure the pH value and the like.
When the pump 40 is turned on during the cleaning period T1, compressed air is gradually supplied to the tank 20 via the tube 22, and the internal pressure of the valve 30 gradually increases via the pipe 21. When the internal pressure exceeds the set pressure specific to the valve 30, the valve body of the valve 30 is instantaneously opened and the compressed air is injected into the sample water W through the cleaning nozzle 31.

Thereby, compressed air expand | swells rapidly and generates the high-speed water flow containing a bubble. The pollutant is efficiently removed by the synergistic effect of this water flow and the vibration of the pollutant itself caused when the boundary between the sample water W and the bubbles contacts the pollutant adhering to the electrode portion 13 in a disorderly manner. The Rukoto.
Thereafter, when the internal pressure of the valve 30 decreases, the valve body closes, the injection of compressed air from the cleaning nozzle 31 stops, and the periphery of the electrode portion 13 is surrounded by the sample water W again.

  In the cleaning period T1, since the opening operation and the closing operation of the valve 30 described above are repeated a plurality of times, the amount of compressed air used can be reduced and the electrode portion 13 can be efficiently and intermittently cleaned. The number of times of cleaning during the cleaning period T1 (the number of times the valve 30 opens) can be set to a desired value depending on the length of the cleaning period T1, the capacity of the tank 20, the set pressure of the valve 30, and the like.

As described above, in the present embodiment, a predetermined amount of compressed air is stored in the tank 20 from the pump 40 via the tube 22, and the action of the valve 30 that opens when the pressure of the compressed air exceeds the set pressure, The compressed air is jetted from the cleaning nozzle 31 toward the electrode portion 13.
Therefore, when the detector main body 10 is installed deeply and the tube 22 becomes long and the piping resistance increases, even if it takes a certain amount of time for the internal pressure of the tank 20 to reach a predetermined value, the tank After the time when the internal pressure of 20 exceeds the set pressure of the valve 30, intermittent cleaning can be performed by opening and closing the valve 30. That is, the tube 22 is not required to have a function of supplying a large amount of compressed air having a predetermined pressure to the tank 20, and may simply be used as an air supply path.

For this reason, there is no reduction in flexibility when a large-diameter tube is used, and there is no reduction in the degree of freedom of installation of the detector body, and the installation stability of the detector body 10 due to the buoyancy of a large amount of compressed air in the tube. There is no inconvenience such as damage.
Moreover, since the metal container with a certain amount of weight is generally used for the tank 20 which stores compressed air, the tank 20 does not have buoyancy.

Next, FIG. 4 is a block diagram showing a second embodiment of the present invention.
If the detector has electrode parts as multiple cleaning target parts, such as a multi-item water quality analyzer or a composite electrode, or if multiple cleaning target parts are separated such as the light emitting part and the light receiving part of the turbidimeter In the case of being arranged, the same number of cleaning nozzles may be provided in correspondence with these sites to be cleaned, and compressed air may be supplied in parallel from the tank to each cleaning nozzle.
In the second embodiment of FIG. 4, the detector bodies 10A and 10B have electrode portions 13A and 13B, respectively, and the outlet side of a single valve 30A connected to the tank 20 is branched into two for cleaning. In this example, nozzles 31A and 31B are formed.

FIG. 5 is a block diagram showing a third embodiment of the present invention, and FIG. 6 is a block diagram showing a fourth embodiment of the present invention. Depending on the position of the region to be cleaned, it may be more effective to perform the cleaning from the side. In the third and fourth embodiments, in consideration of this point, the compressed air is jetted from the side to the region to be cleaned. did.
In the third embodiment of FIG. 5, a valve 30C is arranged in the vertical direction at the center of the bottom of the tank 20, and an L-shaped cleaning nozzle 31C is connected to the outlet side thereof. The fourth embodiment of FIG. The valve 30D is disposed in the horizontal direction on the side surface of the lower end of the tank 20 and the cleaning nozzle 31D is connected.

In any of the embodiments, the cleaning nozzles 31C and 31D are configured to inject compressed air from the side to the cleaning target portion located at the lower end of the detector main body 10C. Since the position (height) of the site to be cleaned varies depending on the detector body, it goes without saying that the positions of the cleaning nozzles 31C and 31D are relatively set according to the height.
The valves 30C and 30D discharge the compressed air by moving the valve body against the built-in spring 32, but the structure of the valve is not limited to the illustrated example. Absent.

In each of the above embodiments, the cleaning compressed gas can be used by mixing not only air but also mists such as various solvents and cleaning agents.
Further, as described above, the site to be cleaned is not limited to the electrode part, and may be, for example, a cell window that constitutes a light emitting part and a light receiving part of a photoelectric conversion type detection cell.

It is a block diagram which shows the use condition of 1st Embodiment of this invention. It is a principal part enlarged view of FIG. It is a timing chart which shows operation | movement of 1st Embodiment of this invention. It is a block diagram which shows the use condition of 2nd Embodiment of this invention. It is a block diagram which shows the use condition of 3rd Embodiment of this invention. It is a block diagram which shows the use condition of 4th Embodiment of this invention.

Explanation of symbols

10, 10A, 10B, 10C: Detector main body 11: Wire 12: Lead wire 13, 13A, 13B: Electrode portion 20: Tank 21: Pipe 22: Tube 30, 30A, 30C, 30D: Valve 31, 31A, 31B, 31C, 31D: Cleaning nozzle 32: Spring 40: Pump 50: Base 51: Arm metal 60: Transducer G: Land W: Sample water

Claims (2)

In the water quality detector cleaning device that removes the pollutant adhered to the cleaning target part in contact with the sample water by the action of the compressed gas sprayed from the cleaning nozzle,
A compressed gas source;
A tube for supplying compressed gas from the compressed gas supply source,
A tank connected to the tube and disposed near the detector body immersed in the sample water to store compressed gas;
A valve the compressed gas is supplied is connected to the tank,
A cleaning nozzle which faces through the sample water to the washing target part disposed on the outlet side of the valve,
With
The tube is stretched along a wire supporting the detector body in sample water;
The valve is opened when the pressure of the compressed gas supplied from the tank exceeds a predetermined set pressure, and the compressed gas is injected from the cleaning nozzle. In the water quality detector cleaning device according to claim 1,
The water quality detector cleaning device, wherein the valve is closed when the pressure of the compressed gas supplied from the tank drops below a predetermined value to stop the injection of the compressed gas.

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