JP4943923B2 - Water quality analyzer - Google Patents

Description

  The present invention relates to a water quality analysis apparatus for analyzing the water quality of, for example, the ocean, rivers / lakes, dams, well water / ground water, urban sewage, factory sewage, agricultural water, and farms.

  Among these types of water quality analyzers, for example, in the case of a water quality analyzer that analyzes the quality of seawater, a plurality of types of measurement sensors are provided in the sensor section of the apparatus, and the sensor section is immersed in seawater so that pH, conductivity Measurements of multiple items such as turbidity, dissolved oxygen concentration, water temperature or salinity are performed continuously at the same time.

  And, as shown in Patent Document 1 or Patent Document 2, the conventional water quality analyzer is provided with a cylindrical protective tube in order to protect a plurality of types of measurement sensors provided at the lower end of the sensor unit. The measurement sensor is prevented from being damaged by an impact or the like during measurement.

  However, for example, when inspecting turbidity, the reflected light is also detected by a photodetector for detecting turbidity due to reflection of sunlight from the bottom surface with the sensor unit installed in water. There is a problem that it is impossible to measure the turbidity.

In addition, as described above, although the measurement sensor is protected by the cylindrical protective tube, since the sensor unit is suspended and immersed in water, the impact due to contact with the ground is large, and the measurement sensor still remains. There are difficulties in preventing damage.
JP 2001-228139 A JP 2000-97930 A

  Accordingly, the present invention has been made to solve the above-mentioned problems all at once, and its main intended problem is to prevent measurement sensor failure due to impact or the like without erroneously detecting reflected light from the outside. Is.

That is, the water quality analyzer according to the present invention includes an immersion type sensor unit having one or a plurality of measurement sensors therein, and a tip portion of the sensor unit has a double wall structure including an inner wall and an outer wall having a gap therebetween. And the inner wall through hole provided in the inner wall and the outer wall through hole provided in the outer wall are arranged so as not to overlap each other , and the outer wall is made of a member having an impact absorbing function . Here, the outer wall is preferably made of an elastic material.

In such a case, since the through holes provided in the inner wall and the outer wall are arranged at different positions from each other, the reflected light from the outside is prevented without disturbing the inflow of the liquid to be measured into the sensor unit. Intrusion to the sensor unit can be prevented. Moreover, since the outer wall is formed of a member having an impact absorbing function such as an elastic material, the impact received from the bottom surface when the sensor unit is installed in water can be eased, and the measurement sensor can be prevented from being damaged due to the impact. be able to.

Specifically, the water quality analyzer according to the present invention includes an immersion type sensor unit main body having one or a plurality of measurement sensors, and a bottomed cylindrical shape that is attached to the sensor unit main body and protects the measurement sensor from the outside. And a bottom wall of the sensor protection part has a double wall structure including an inner wall and an outer wall having a gap therebetween, an inner wall through hole provided in the inner wall and an outer wall provided in the outer wall The through holes are arranged so as not to overlap each other , and the outer wall is made of a member having an impact absorbing function . In this case, the effect of the present invention can be achieved without changing the design of the sensor body of the conventional water quality analyzer.

  At this time, it is desirable that the outer wall through hole and the inner wall through hole are provided at different positions at least in the radial direction. In this case, when the outer wall is attached to the inner wall, the inner wall through hole and the outer wall through hole can be arranged at different positions without considering the circumferential position.

  As a specific shape of the inner wall, it is desirable that the inner wall is a convex shape protruding toward the outer wall side, and a tip portion thereof is in contact with or close to the outer wall. If it is this, it can prevent that the outer wall formed from the elastic member bends, and can reduce the impact at the time of sensor part installation suitably.

  According to the present invention configured as described above, in the water quality analyzer having the immersion type sensor unit, the photodetector for turbidity measurement does not erroneously detect the reflected light from the outside, and measurement by impact or the like. Sensor failure can be prevented.

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the water quality analyzer 1 according to the present embodiment. FIG. 2 is a cross-sectional view of the sensor unit 2, and FIG. 3 is a cross-sectional view of the sensor protection unit 22.

<Device configuration>
The water quality analyzer 1 according to the present embodiment continuously measures measurement items such as pH, conductivity, dissolved oxygen concentration, turbidity, and water temperature simultaneously, as shown in FIG. As shown in FIG. 2, an immersion type sensor unit 2 including a plurality of measurement sensors 4 for measuring water quality, and an instrument body 3 electrically connected to the sensor unit 2 via a waterproof electric cable CA. And. For example, when water quality analysis of seawater is performed, the electric cable CA is held and the sensor unit 2 is suspended in seawater and immersed in seawater.

  The sensor unit 2 includes an immersion type sensor unit main body 21 having a plurality of types of measurement sensors 4 and a sensor protection unit 22 attached to the sensor unit main body 21 to protect the measurement sensor 4 from the outside. . The sensor protection unit 22 will be described later.

  The sensor unit main body 21 includes a power unit, a calculation unit having a memory function unit, a watertight case 211 having a pressure-resistant structure including a data logger for recording the measurement data of the calculated water quality in time series, and a lower end of the watertight case 211 For example, a pH sensor, a conductivity sensor, a turbidity sensor, a Do sensor, a temperature sensor, and the like, which are attached to the unit 211A and configured by a glass pH electrode for pH measurement and a comparison electrode, are provided. The glass pH electrode, the comparative electrode, and the DO sensor are of a cardridge type and are easily exchanged in consideration of the fact that they are generally accompanied by deterioration or unexpected damage with use.

  Here, the structure of the turbidity sensor 41 that is easily affected by external light (direct sunlight, reflected light) will be described.

  As shown particularly in FIG. 2, the turbidity sensor 41 is provided in a turbidity sensor accommodating portion 212 provided at the lower end portion of the watertight case 211. The turbidity sensor accommodating unit 212 accommodates a measurement cell that is a cylindrical tube installed with its upper and lower ends open, and a light source, a transmitted light detector, and a scattered light detector provided on the side periphery of the cylindrical tube. ing. In the measurement cell, a light transmission window is provided in a portion corresponding to the light source, the transmitted light detector, and the scattered light detector. Further, a wiper W for wiping off the dirt on the light transmission window is provided.

  And when the sensor protection part 22 mentioned later is attached to the sensor part main body 21, some gap | interval G forms in the lower end part of the turbidity sensor accommodating part 212, and the inner surface of the bottom wall 221B of the sensor protection part 22 Is done. The slight gap G means that most of the direct sunlight that has passed through the through hole H3 provided in the side wall 221A of the sensor protection unit 22 does not reach the photodetector, while the liquid flows into the measurement cell. It is a gap.

  The meter body 3 includes a display unit for displaying measurement data from the sensor unit 2, a power key, a function key, a measurement start / end key, a calibration key, a select key, an up / down key, and the like. When the sensor unit 2 is submerged by operating the electric cable CA, measurement data based on the output from each measurement sensor 4 is recorded in the memory function unit, and the measurement value is displayed on the display unit. .

  Therefore, the sensor unit 2 according to the present embodiment has a light shielding function for shielding light from the outside and an impact absorbing function for absorbing an impact received from the outside during installation and measurement.

  Specifically, the sensor protection unit 22 of the sensor unit 2 exhibits the above function. The sensor protection unit 22 is attached to the sensor unit main body 21 (specifically, the lower end portion 211A of the watertight case 211), and guides liquid (for example, seawater) that is an external measurement target to the inside of the sensor unit 2. Also, the measurement sensor 4 is protected from the outside.

  In other words, as shown in FIG. 3 in particular, the sensor protection unit 22 has a double wall structure including an inner wall and an outer wall having a gap G at the bottom, and has a bottomed protection unit body 221 and the protection unit body 221. And a cushion member 222 that forms an outer wall having a predetermined gap G from the inner wall with the bottom wall 221B as an inner wall.

  The protection part main body 221 has a bottomed cylindrical shape, and is fitted and attached to the distal end part of the sensor part main body 21, more specifically, the outer peripheral surface of the lower end part 211A of the watertight case 211. is there. The side wall 221A is provided with a plurality of through holes H3 for allowing the liquid to be measured to flow inside, and the bottom wall 221B is provided with a circular through hole (inner wall through hole) H1. Further, the bottom wall 221B has a convex cross-sectional shape protruding outward, and in the present embodiment, has a substantially V-shaped cross section.

  The cushion member 222 is made of an elastic material, and is provided on a disc portion 2221 and a side peripheral edge of the disc portion 2221, and is engaged with an engagement groove 2211 provided on a side wall of the protection portion main body 221. 2222.

  Further, the cushion member 222 is attached using the elastic deformation of the locking portion 2222 so that the locking portion 2222 fits into the locking groove 2211. Thereby, the disk part 2221 becomes an outer wall. The disc portion 2221 is provided with a through hole (outer wall through hole) H2 in a circular shape.

  Here, the inner wall through hole H1 and the outer wall through hole H2 are provided at different positions at least in the radial direction. In other words, the installation radii from the center are different. In the present embodiment, the installation radius of the inner wall through hole H1 is made smaller than the installation radius of the outer wall through hole H2.

  And by attaching the cushion member 222 to the protection part main body 221, the inner wall through-hole H1 and the outer wall through-hole H2 are arrange | positioned on a concentric circle, when it sees from an axial direction. That is, the inner wall through-hole H1 and the outer wall through-hole H2 do not overlap each other and are arranged at different positions no matter which direction the cushion member 222 is attached to the protection part main body 221.

  Further, at the same time as attaching the cushion member 222 to the protection portion main body 221, the central portion of the bottom wall 221B of the protection portion main body 221 contacts the central portion of the disc portion 2221 of the cushion member 222 to such an extent that elastic deformation does not occur. Thereby, the cushion member 222 is bent and does not deform inelastically, and when the sensor unit 2 comes into contact with the seabed or the riverbed, the impact can be dispersed throughout the cushion member 222.

<Effect of this embodiment>
According to the water quality analyzer 1 according to the present embodiment configured as described above, the tip 2A of the sensor unit 2, specifically, the bottom of the sensor protection unit 22 has a double wall structure and is provided on the inner wall 221B. Since the inner wall through hole H1 and the outer wall through hole H2 provided in the outer wall 2221 are arranged at different positions, the reflected light from the outside enters the measurement sensor 4 without hindering the inflow of liquid from the outside. Can be prevented.

  In addition, since the outer wall 2221 is formed of an elastic material, it is possible to reduce the impact received when the sensor unit 2 is installed in water, and to prevent the measurement sensor 4 from being broken due to the impact.

<Other modified embodiments>
The present invention is not limited to the above embodiment. In the following description, the same reference numerals are given to members corresponding to the above-described embodiment.

  For example, in the above-described embodiment, the inner wall 221B has a convex shape that protrudes toward the outer wall 2221 so that the inner wall 221B and the outer wall 2221 are in contact with each other at the center portion. However, as shown in FIG. 2221 may be provided in parallel.

  Further, in the above-described embodiment, the locking member 2222 is provided on the cushion member 222 and is attached by utilizing its elastic deformation. However, it may be attached using a fixing member or screwed. You may make it attach. At this time, the inner wall through hole H1 and the outer wall through hole H2 may be provided at different positions in the circumferential direction, or may be provided at different positions in the radial direction and the circumferential direction.

  Furthermore, as the shape of the inner wall 221B, in addition to the substantially V-shaped cross section, the inner wall 221B may be a generally saddle-shaped cross section, or may have a protruding portion that protrudes only at the central portion of the inner wall.

  In addition, although the sensor unit 2 includes a pH sensor, a conductivity sensor, a turbidity sensor, a Do sensor, and a temperature sensor, the measurement sensor 4 is not limited thereto. In addition, a sensor for measuring salinity, TDS (total amount of dissolved solids), seawater specific gravity, water depth, ORP, nitrate ion, calcium ion, and chloride ion may be provided.

  In addition, in the above-described embodiment, the central portion of the bottom wall 221B of the protection portion main body 221 is in contact with the central portion of the disc portion 2221 of the cushion member 222, but inelastic deformation of the disc portion 2221 is prevented. You may make it close to a grade.

  In addition, some or all of the above-described embodiments and modified embodiments may be combined as appropriate, and the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. .

The perspective view of the water quality analyzer concerning a 1st embodiment. Sectional drawing of the sensor part in the embodiment. Sectional drawing of the sensor protection part in the embodiment. Sectional drawing of the sensor protection part of the water quality analyzer which concerns on a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Water quality analyzer 2 ... Sensor part 2A ... Tip part G of sensor part ... Gap 21 ... Sensor part main body 22 ... Sensor protection part 221 ... Protection part main body 221B ..Inner wall (bottom wall of protection unit body)
222 ・ ・ ・ Cushion member H1 ・ ・ ・ Inner wall through hole 2221 ・ ・ ・ Outer wall (disk part of the cushion member)
H2 ... Outer wall through hole 3 ... Instrument body 4 ... Measurement sensor

Claims (5)

An immersion type sensor unit having one or more measurement sensors inside;
The sensor portion has a double wall structure composed of an inner wall and an outer wall having a gap therebetween,
The inner wall through hole provided in the inner wall and the outer wall through hole provided in the outer wall are disposed so as not to overlap each other ,
A water quality analyzer, wherein the outer wall is made of a member having an impact absorbing function . An immersion type sensor unit body having one or more measurement sensors;
A bottomed cylindrical sensor protector that is attached to the sensor body and protects the measurement sensor from the outside;
The bottom of the sensor protection part has a double wall structure consisting of an inner wall and an outer wall having a gap between them,
The inner wall through hole provided in the inner wall and the outer wall through hole provided in the outer wall are disposed so as not to overlap each other ,
A water quality analyzer, wherein the outer wall is made of a member having an impact absorbing function .   The water quality analyzer according to claim 1 or 2, wherein the inner wall through hole and the outer wall through hole are provided at different positions at least in the radial direction.   The water quality analyzer according to claim 1, 2 or 3, wherein the inner wall has a convex shape protruding toward the outer wall, and a tip portion of the inner wall is in contact with or close to the outer wall.   The water quality analyzer according to claim 1, wherein the outer wall is made of an elastic material.