KR20130017131A - Water quality monitoring system by measuring surface tension of water - Google Patents

Abstract

PURPOSE: A water quality measuring device using surface tension measurement is provided to measure a polluted level of water rapidly and conveniently and to utilize the device as a portable water quality measuring device since the miniaturization of the device is possible. CONSTITUTION: A water quality measuring device using surface tension measurement comprises a lever(10), a water repellent plate, a water box for weight(30), a syringe(40), a rack, a pinion gear, and a rotary scale plate. The lever is formed into an equal arm balance form. The water repellent plate is formed on one end of the lever. The water box for weight is formed on the other end of the lever. The syringe is connected to one end of a tube(42), and the other end of the tube is dipped into water(31) inside the water box for weight. A piston(41) of the syringe is joined to the rack. The rack is driven by the pinion gear.

Description

Water Quality Monitoring System by Measuring Surface Tension {Water Quality Monitoring System by Measuring Surface Tension of Water}

The present invention relates to an apparatus for measuring water quality, and more particularly, to an apparatus for measuring water quality by measuring a lower surface tension in contaminated water.

When measuring water quality, various items are measured, but the degree of contamination by organic matter is measured by measuring dissolved oxygen (DO), biochemical oxygen demand (BOD), and chemical oxygen demand (Chemical OxygenDemand (COD)). Determine. These items serve as representative measures of water self-cleaning capacity and pollution levels. Since living organisms and microorganisms in the water breathe dissolved oxygen, and the organic matter in the water is oxidatively decomposed by it, the lack of dissolved oxygen only causes the death of organisms and the removal of organic matter in the water Cause contamination. Process test methods for measuring DO include the Winkler-Nazide amorphization method (titration method) and the diaphragm electrode method.

BOD is the amount of oxygen required to decompose organic matter in water. High BOD means that the water quality is bad because there is a lot of organic matter in the water. For BOD measurement, two bottles of water are taken, one immediately measures DO, and the other is sealed and left for 5 days in a dark place at 20 ° C. before measuring DO. Bottles left for 5 days initially contain dissolved oxygen as measured by other bottles, but the amount of dissolved oxygen decreases because microorganisms decompose and consume oxygen for 5 days. Therefore, it is calculated as the amount of oxygen required for microorganisms to break down organic matter, ie “BOD = DO measured immediately – DO measured after 5 days”.

Organics, nitrites, etc. in water consume oxygen dissolved in water. When these substances are contained, oxygen in the water is lost and organisms cannot live and water rots. When potassium permanganate or potassium dichromate is added to such water as an oxidizing agent, the organic substance is oxidized, and COD represents the amount of oxygen corresponding to the amount of the oxidizing agent used. Therefore, the higher the COD value, the more pollutants are contained and the poorer the water quality.

To measure DO described above, Winkler-Nazide arithmetic method (titration method) and diaphragm electrode method use chemical and electrical methods, and to measure BOD, at least 5 days using DO measurement method This takes COD measurements should also accurately calculate the amount of soluble oxidant added and the amount of oxidant used. Therefore, these methods take a lot of time when measuring, there is a problem that the measurement method is complicated.

Conventional water quality measuring apparatuses use chemical or electrical methods, which require complicated procedures and long measuring times for observing chemical and electrical changes.

The present invention is intended to solve the above problems. Since the present invention measures the physical quantity of the surface tension of water using a mechanical device, it can be measured simply, and the measurement time is also very short. Accordingly, an object of the present invention is to provide a water quality measuring device having a new method for measuring water quality and at the same time excellent in user convenience.

The water quality measuring apparatus using the surface tension measurement according to the present invention includes a lever in the form of a two-arm scale, a water repellent foot, a weight bucket, a water supply / discharge syringe, and a rotary scale plate. The water repellent foot is connected to one end of the lever in the form of a two-arm scale, and the weight bucket is connected to another end. The piston of the water supply / discharge syringe is connected with the rack, the rack is connected with the pinion gear, and the pinion gear is connected with the motor. The rack serves to change the rotational movement of the gear to a linear movement for the linear movement of the piston. The rotary scale plate is also connected to the gear attached to the motor. The rotary scale plate makes it possible to read the moving distance of the piston accurately.

In the water quality measuring apparatus, the water repellent foot is preferably coated on the surface of a very thin plate or a thin plate of water repellent material to float on water with surface tension. Meanwhile, the plate may be manufactured in various shapes such as an annular shape, a star shape, and a spider web shape.

Further, in the water quality measuring device, it is preferable that the center portion of the lever in the form of a two-arm scale allows rotation without friction as much as possible in the center portion of the lever so that the lever can move freely.

In the water quality measuring device, the water repellent foot is connected to one end of the lever in the form of a two-arm scale, and the weight bucket is preferably connected to another end.

In addition, in the water quality measuring device, the weight bucket is preferably the end of the tube from the outside to enter the water so that water can be supplied or discharged. The tube coming in from the outside can interfere with the free movement of the weight bucket, so the tube must not be in direct contact with the weight bucket, and one end of the tube must be in the water contained in the weight bucket.

Further, in the water quality measuring device, one end of the tube is connected to the end of the water supply / discharge syringe, so that the water in the syringe enters the weight bucket or the water from the weight bucket due to the piston movement of the syringe. It is desirable to pull out.

In the above water quality measuring device, it is preferable that the piston of the syringe is connected with a rack for changing the rotational movement of the pinion gear connected to the motor to a straight line.

In the above water quality measuring apparatus, it is preferable that the rotary scale plate is connected to the gear. Therefore, the moving distance of the syringe piston can be known from the number of rotated scales of the rotary scale plate.

According to the present invention, by providing a water quality measuring device using the surface tension measurement using a lever in the form of a two-arm scale and a water repellent foot, weight bucket and water supply / discharge syringe, it is possible to quickly and easily measure the degree of contamination of water.

Further, according to the present invention, since the water quality measuring apparatus can be miniaturized, it can be applied as a portable water quality measuring apparatus.

1 is a conceptual diagram of an embodiment of an apparatus for measuring water quality using surface tension according to the present invention;
2 is a conceptual view of the action of the water repellent foot of the embodiment shown in FIG.
3 is a conceptual view illustrating the operation of supplying and discharging water from the weight bucket of the embodiment shown in FIG. 1;
4 is a conceptual diagram in which the piston of the syringe moves in the embodiment shown in FIG.
5 is a conceptual diagram of a rotating scale plate in the embodiment shown in FIG.
FIG. 6 is a manufacturing example of the water quality measuring apparatus shown in FIG. 1. FIG.

1 is a conceptual diagram of an embodiment of a water quality measurement apparatus using the surface tension measurement according to the present invention, Figure 2 is a conceptual diagram of the action of the water repellent foot of the embodiment shown in FIG. FIG. 3 is a conceptual view illustrating an operation in which water is supplied and discharged from the weight bucket of the embodiment illustrated in FIG. 1, and FIG. 4 is a conceptual diagram in which the piston of the syringe moves in the embodiment illustrated in FIG. 1. 5 is a conceptual diagram of a rotating scale plate in the embodiment shown in FIG. 1, and FIG. 6 is an example of manufacturing the water quality measuring apparatus shown in FIG. 1. An embodiment of a flexible X-ray image sensor according to the present invention will be described with reference to FIGS. 1 to 5.

Water quality measuring apparatus according to the present invention is a lever 10, a water repellent foot 20, a weight bucket 30, a water supply / discharge syringe 40, a rack 63 and pinion The gear 62 and the rotation scale plate 70 is included.

One end of the lever 10 in the form of both arms connects the water repellent foot 20, the other end connects the weight bucket 30.

In addition, the syringe 40 is connected to one end of the tube 42, another end of the tube is immersed in the water 31 of the weight bucket 30. At this time, the tube 42 should not be in contact with the weight bucket (30). If the tube 42 is in contact with the weight bucket 30 is because the two-arm balance lever 10 is restricted to move freely because it is difficult to accurately measure the water quality.

 In addition, as shown in FIG. 4, the piston 41 of the syringe overlaps with the rack 63, and the rack 63 is driven by the pinion gear 62. The rotational movement of the pinion gear 62 is changed into a linear movement by the rack 63 to move the piston 41 of the syringe back and forth. The pinion gear 62 is moved by the rotation of the gear 60 connected to the motor. Meanwhile, the gear 60 connected to the motor is also engaged with the gear 61 connected to the rotation scale plate. The water 31 filled in the weight bucket 30 shown in (a) of FIG. 3 increases the amount of the water 31 filled in the weight bucket 30 when the piston 41 moves forward to increase the weight bucket ( 30) becomes heavy, and as a result, the weight bucket 30 is lowered as shown in FIG. On the contrary, when the piston 41 moves backward, the water is reduced in the weight bucket 30 so that the weight bucket 30 becomes light, and accordingly, the weight bucket 30 as shown in FIG. Go up this

When the water repellent foot 20 shown in FIG. 2 touches the surface of the measurement solution 51 as shown in FIG. 2 (a), when the weight of the weight bucket 30 becomes light, as shown in FIG. 2 (b) The water repellent foot 20 goes down further. At this time, due to the surface tension of water, the water surface sags downward as shown in FIG. As shown in (c) of FIG. 2, when the water repellent foot 20 is further lowered and the force pressed by the water repellent foot 20 becomes greater than the surface tension of the measurement solution, the water repellent foot 20 is exposed to water. Will fall out.

 Up and down movement of the water repellent foot 20 is dependent on the weight of the weight bucket 30, the weight of the weight bucket 30 is determined by the supply or discharge of water in accordance with the movement of the syringe piston (40). Read the scale of the syringe piston when the water-repellent foot 20 touches the surface of the measuring solution 51, read the scale of the syringe piston when the water-repellent foot 20 falls into the measuring solution 51, and calculate the difference Find the piston travel distance. The worse the water quality of the measurement solution 51, the lower the surface tension of the solution and the shorter the moving distance of the piston 41, while the better the water quality of the measurement solution 51, the higher the surface tension of the solution, the movement of the piston 41 The distance gets longer. The quality of the measurement solution 51 can be evaluated by the movement distance of the piston.

Although the movement distance of the piston 41 can be measured by the scale of the syringe 40, the scale of the syringe 40 is too fine, which makes it difficult to accurately measure and cause a large measurement error. As a solution to this problem, as shown in (a) of FIG. 5, the gear 61 connected to the rotary scale plate and the rotary scale plate 70 are attached so that the rotary scale plate 70 also rotates when the gear 61 rotates. Do it. At this time, the fixed plate 71 is separated from the gear 61 and the rotary scale plate 70 connected to the rotary scale plate does not rotate fixed. One point of the fixed plate 71 is provided with a fixed plate reference point 72, so that the amount of rotation of the rotary scale plate 70 can be accurately measured.

The water quality measuring device shown in FIG. 6 illustrates a prototype actually manufactured.

An embodiment of the present invention described above should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

10: lever in the form of both arms 20: water repellent foot
21: water repellent foot support 30: weight bucket
31: water in a bucket 40: syringe
41: syringe piston 42: tube
50: measuring solution container 51: measuring solution
60: gear connected to the motor 61: gear connected to the rotary graduation plate
62: pinion gear 63: rack
70: scale plate 71: fixed plate
72: fixed plate reference point

Claims (1)

Lever in the form of a two-arm scale,
A water quality measuring device using surface tension measurement, characterized in that a water repellent foot is provided at one end of the lever, and a weight bucket is provided at another end of the lever.

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