JPS628516Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used for water quality monitoring of water and sewage water and for operation and management of water and sewage treatment plants. (absorption type organic pollution meter, etc.).

Water quality meters, especially water quality meters used for sewage, are heavily contaminated and require cleaning to maintain their performance. Therefore, automatic cleaning is used to make it maintenance-free for a long time without requiring human intervention. Cleaning methods include water jet cleaning, brush cleaning, ultrasonic cleaning, chemical cleaning, etc., and the most suitable method is selected depending on the measuring method of the water quality meter and the object to be cleaned.

Now, light (as a light source, a tungsten lamp,
Let's consider cleaning methods for water quality meters that measure water quality using xenon lamps, light emitting diodes, laser lights, mercury lamps, etc.). In Figures 1a and b, 1
2 is a light source, and 2 is a measuring tube made of a material that allows light from the light source to pass through well. 3 and 4 are light receivers; 3 is a transmitted light receiver that receives the light from the light source 1 that has passed through the measurement tube 2 and the liquid to be measured 5; and 4 is a transmitted light receiver that similarly receives scattered light. It is a scattered light receiver. With this configuration, for example, by adding sewage as the liquid to be measured 5 and taking the ratio of the respective outputs of the transmitted light receiver 3 and the scattered light receiver 4, a concentration meter can be created by converting the attenuation of the amount of received light into concentration. can.

In this measurement, if dirt adheres to the inner surface of the measuring tube 2, measurement errors will occur, so the inner surface of the measuring tube must always be kept clean. There are various cleaning methods mentioned above for this purpose, and cleaning may be carried out using these methods, but recently, as an even better cleaning method, a wiper seal is moved back and forth inside the measuring tube 2 to remove dirt. An automatic cleaning method is adopted that performs both scraping and suction/draining of the liquid to be measured, which eliminates the need for a pump to suction/drain the liquid to be measured and has a high cleaning effect. Currently, it is widely used as the best cleaning method.

FIG. 2 shows an example of a cleaning mechanism using a wiper seal, in which a wiper seal 6 is inserted inside the measuring tube 2. The wiper seal 6 is fixed to a drive shaft 7, and is reciprocated on the inner surface of the measurement tube 2 by a drive source 8, sucking and discharging the liquid to be measured 5, and
Scrape off dirt from the inside of the measuring tube and clean it. The measuring tube 2 is made of glass or plastic, the wiper seal 6 is made of rubber or plastic, and the drive source 8 is made of an electric cylinder, a hydraulic cylinder, an air cylinder, etc.

By the way, in order to maintain correct measurements, it is necessary that the wiper seal 6 always operates correctly to carry out suction and discharge operations, and at the same time scrape off dirt from the inner surface of the measuring tube 2. If this happens, the measured value will be incorrect. Therefore, as part of daily inspections, it is necessary to check the measured values for any abnormalities and to check whether the cleaning mechanism is operating correctly. In order to check the operation of the cleaning mechanism, the detection section was pulled up from the liquid to be measured and visually checked to see if the wiper seal 6 was operating. However, with this method,
The detection part must be pulled up, inspected, and reinstalled, which not only requires a lot of manpower and time, but also
During that time, there was a problem of missing measurements.

The present invention was developed to solve the above problems, and includes a position switch that detects the positions of both ends of the reciprocating movement of the cleaning mechanism, and switches the light on and off alternately based on the detection signal from this position switch. By installing a cleaning operation indicator in the converter of the water quality meter, or transmitting a signal to display the cleaning operation in a central monitoring room, etc., the water quality meter can be constantly operated at the installation location or in a remote location. This makes it easy to check the cleaning operation.

Embodiments of the present invention will be described below with reference to the drawings. Figures 3 and 4 show an embodiment of the water quality meter according to the present invention; Figure 3 is a system diagram; Figure 4 is a system diagram;
The figure is a schematic diagram showing the installed state. Note that parts equivalent to those in FIG. 1 are given the same reference numerals, and their explanations will be omitted. In FIGS. 3 and 4, reference numeral 9 denotes a detection section, which is supported by a holder 12 and immersed in the liquid to be measured 5, as shown in FIG. Holder 12
is fixed to the support fence 13 by support arms 14. The support fence 13 is installed in the liquid tank 50 to be measured, and the conversion section 20 of the water quality meter is also supported on the top thereof. A protrusion 7a is provided on the drive shaft 7 of the wiper seal 6.
is provided so that when the wiper seal 6 moves to the deepest position (suction operation), the position switch A10 is activated, and the wiper seal 6 moves to a position near the open end of the measuring tube 2 (discharge operation). When I did,
Position switch A10 and position switch B11 are arranged so that position switch B11 works.

Inside the converter 20, there are provided a drive control circuit 21 that receives detection signals from the position switch A10 and the position switch B11 and controls the drive source 8, and switches A22, 23, 24 and a switch B25 that are controlled by the drive control circuit 21. ing. Further, there is a measurement circuit 26 that receives signals from the transmitted light receiver 3 and the scattered light receiver 4, processes the signals, and outputs a measurement signal, and the output of the measurement circuit 26 is indicated as a measurement value by an indicator 27. The water quality is sent to a central monitoring room 40 remote from the water quality meter installation location and indicated as a measured value by an indicator 28. Reference numeral 29 denotes a cleaning operation indicator provided in a position that is easily visible from the outside of the conversion unit 20, and 30 refers to a cleaning operation indicator provided in the central monitoring room 40. Switches A23 and 24 control the intake and discharge operations of the piston seal. It flashes each time to indicate that the cleaning operation is operating normally. 3
1 and 32 are power supplies for cleaning operation indicators 29 and 30, respectively.

Next, the operation of the water quality meter according to an embodiment of the present invention constructed as described above will be explained with reference to FIG.
The liquid to be measured 5 is sucked into the measuring tube 2 by the suction operation (ascending movement in the figure) of the wiper seal 6.
The light emitted from the light source 1 is transmitted through the liquid to be measured, is scattered, and is received by the transmitted light receiver 3 and the scattered light receiver 4, respectively, and is processed by the measurement circuit 26 to become a measurement signal, and the indicators 27, 28 Directed by. Suction (raising) and discharge (lowering) of the wiper seal 6 are controlled by a drive control circuit 21 . That is,
A signal from the drive control circuit 21 causes the switch A22,
When 23 and 24 are closed, the drive source 8 drives the wiper seal 6 via the drive shaft 7 in a direction away from the open end of the measuring tube 2 (in an upward direction). This operation continues until the projection 7a of the drive shaft 7 drives the position switch A10. When the position switch A10 operates, the drive control circuit 21 operates the switches A22, 2.
3 and 24 are opened, and switch B25 is closed.
Then, the drive source 8 reverses its drive direction by the switch B25, and drives the wiper seal 6 in a direction toward the open end of the measuring tube 2 (downward direction). Due to this movement of the wiper seal 6, the liquid to be measured 5 is transferred to the measuring tube 2.
Expelled from within. This ejection operation continues until the projection 7a of the drive shaft 7 drives the position switch B11. When the position switch B11 operates, the drive control circuit 21 opens the switch B25 and closes the switches A22, 23, and 24, and the drive source 8 reverses the drive direction by the switch A22.
The wiper seal 6 is driven in the direction away from the open end of the measuring tube 2 (in the upward direction). In this way, the wiper seal 6 repeatedly ascends and descends according to the opening/closing signals of the position switch A10 and the position switch B11, suctioning and discharging the liquid to be measured 5, and scraping off the dirt on the inner surface of the measuring tube 2. Always keep the inside clean.

On the other hand, when the wiper seal 6 performs the suction operation and reaches the deepest position of its stroke, the drive control circuit 21 opens the switches A23 and 24 based on the detection signal of the position switch A10, so the cleaning operation indicators 26 and 30 go out. be done. This state is maintained while the discharge operation of the wiper seal 6 continues. When the wiper seal 6 reaches the end point of the discharge operation, that is, a position near the opening end of the measuring tube 2, the position switch B11 is activated, and the drive control circuit 21 closes the switches A23 and 24 based on the detection signal, so that the cleaning operation indicator 26 and 30 are lit. This state is maintained while the suction operation of the wiper seal 6 continues. When the wiper seal 6 reaches the end point of the suction operation, the drive control circuit 21 is activated by the detection signal from the position switch A10.
opens the switches A23, 24, the cleaning operation indicators 26 and 30 are turned off, and the above-described operation is repeated. In this way, the cleaning operation indicators 26 and 30 turn on and off in conjunction with the suction and discharge operations of the wiper seal 6, as shown in FIG. 5, to ensure that the cleaning mechanism is operating normally. display that the This display operation of turning on and off is repeated at regular intervals, with one cycle of suction and discharge from the cleaning mechanism. In addition, in the measurement circuit 26, during the discharge operation (lowering) of the wiper seal 6, the previous measurement value is held.
After the wiper seal 6 performs a suction operation (raises), the measurement is performed and the measured value is replaced, so that even if light is blocked by the wiper seal 6, the measurement will not be hindered.

As is clear from the above description, the water quality meter according to the present invention is provided with a position switch A10 and a position switch B11 for detecting the innermost position of the reciprocating stroke of the wiper seal 6 and the position near the opening end of the measuring tube 2. Switches A23 and 2 are opened and closed by the drive control circuit 21 according to this detection signal.
4, and these switches turn on and off the cleaning operation indicators 29 and 30 installed in the converter 20 of the water quality meter and the central monitoring room 40 in conjunction with the suction and discharge operations. The operation check of step 6 can be carried out extremely easily and in a short time by observing the blinking of the cleaning operation indicators 29 and 30 while the detector 9 is in operation with the detector 9 installed. In addition, by measuring the lighting cycle of the cleaning operation indicators 29 and 30, it is possible to immediately determine whether the cleaning operation is normal or abnormal, making it easy to quickly discover and deal with problems in the cleaning mechanism. This avoids the inconvenience of continuing erroneous measurements without being discovered. In addition, since the cleaning operation indicator is also installed in the central monitoring room 40, the cleaning operation can be confirmed without going to the location where the water quality meter is installed. Compared to having to perform operation checks, daily inspections are much easier, labor-saving, and time-saving, and not only are missing measurements during inspections eliminated, but correct measurements are maintained.

Note that the present invention is not limited to the embodiments shown in FIGS. 3 to 5, and can be implemented with various modifications as described below.

[1] In the above embodiment, the on-site cleaning operation indicator 29 was installed in the glass window of the converter 20 along with the indicator 27, but it may also be installed independently on the outer surface of the case of the converter 20. Alternatively, if the detection section 9 and the conversion section 20 are installed apart from each other, the cleaning operation indicator 29 may be installed on the top of the holder 12 of the detection section 9.

[2] In the above-mentioned embodiment, a cleaning mechanism using a wiper seal was illustrated, but the present invention can be similarly applied to any cleaning mechanism in which the cleaning tool moves back and forth to scrape off dirt (for example, brush cleaning). It can be implemented.

[3] In the above embodiment, the cleaning operation indicator 2
Although the lighting of the wiper seals 9 and 30 is linked to the suction operation of the wiper seal 6, the lights may be turned off during the suction operation and turned on during the discharge operation. In addition, as shown in the cleaning operation indicator A shown in Fig. 6, one of the suction and discharge
The light may be turned on for an arbitrary period of time during a period, and the lighting interval is the same as one period. Further, like the cleaning operation indicator B or C shown in FIG. 6, it may be made to blink an integral number of times during one cycle, and from the relationship between the number of times and the time, one cycle may be a predetermined period of time. By checking whether the operation is normal or abnormal, it can be determined whether the operation is normal or abnormal.

[4] In the above-described embodiments, a concentration meter is used as an example of a water quality meter, but the present invention is not limited to this, and can be implemented in general water quality meters equipped with an automatic cleaning mechanism, such as an ultraviolet absorption type organic pollution meter (UV meter).

As detailed above, according to the present invention, the cleaning operation of the cleaning mechanism is performed while the detection unit is in operation with the detection unit installed.
A water quality meter that can be checked at a glance at the site or in the central monitoring room, greatly saving labor and time for inspections, and eliminating the inconvenience of continuous erroneous measurements due to difficulty in discovering defects in the cleaning mechanism. can be provided.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and a side view showing the measurement principle of an optical water quality meter, Figure 2 is a sectional view of the main part showing a cleaning mechanism using a wiper seal, and Figure 3 is a water quality meter according to the present invention. A system diagram showing the configuration of one embodiment, Fig. 4 is a schematic diagram showing the installation state of the water quality meter in Fig. 3, and Fig. 5 shows the display operation of the cleaning operation indicator and wiper seal of the water quality meter in Fig. 3. FIG. 6 is a time chart showing the relationship between the display operation of each of three different examples of the display operation of the cleaning operation indicator according to the present invention and the cleaning operation of the wiper seal. be. DESCRIPTION OF SYMBOLS 1... Light source, 2... Measurement tube, 3... Transmitted light receiver, 4... Scattered light receiver, 5... Liquid to be measured, 6...
... Wiper seal, 7 ... Drive shaft, 7a ... Protrusion, 8 ... Drive source, 9 ... Detection section, 10 ... Position switch A, 11 ... Position switch B, 20 ...
Conversion unit, 21... Drive control circuit, 22, 23, 2
4...Switch A, 25...Switch B, 26...
...Measuring circuit, 27, 28...Indicator, 29, 30
...Cleaning operation display, 31, 32...Cleaning operation display power supply, 40...Central monitoring room.

Claims (1)

[Claims for Utility Model Registration] (1) The liquid to be measured is sucked into a transparent measuring tube of a detection unit immersed in the liquid to be measured, and its water quality characteristics are optically detected, and the liquid is placed outside the liquid to be measured. In a water quality meter that outputs a signal indicative of water quality characteristics by processing the signal in a measuring circuit in a converting section, the water quality meter is provided in the detecting section and moves reciprocatingly within the measuring tube at a predetermined stroke to scrape off dirt on the inner wall of the measuring tube. Position switch A detects when the cleaning tool to be dropped reaches the deepest position
and a position switch B that detects when the cleaning tool reaches a position near the opening end of the measurement tube, and a drive control circuit that is provided in the conversion section and reverses the direction of movement of the cleaning tool based on detection signals from both of these position switches. , said position switch A and or B
1. A water quality meter comprising: a cleaning operation indicator that can be switched on and off by the drive control circuit each time a detection signal from the water quality meter is input to the drive control circuit. (2) The scope of claim 1 for registering a utility model, characterized in that the cleaning operation indicator is installed in an appropriate location such as a converter of a water quality meter and/or a central monitoring room separated from the location where the water quality meter is installed. Water quality instrument.