JP3051921U - Residual chlorine concentration measurement sensor - Google Patents

Abstract

(57) [Abstract] [Problem] The detection current corresponding to the residual chlorine concentration cannot be obtained because the flow rate of the electrode surface of the residual chlorine concentration measurement sensor is kept constant and the base metal of the cathode adheres to the noble metal surface of the anode and becomes dirty. To improve. [Solution] Water turbine room 1 in which measured water is supplied and drained
A water wheel 9 is rotated by a motor 10 and an anode 41 is driven by glass beads 5 in a glass bead chamber 6 provided in the water wheel room.
The base metal of the cathode 42 adhering to the noble metal surface is cleaned together with the water to be measured.

Description

[Detailed description of the invention] [Technical field to which the invention belongs] The present invention relates to a residual chlorine concentration measurement sensor used for monitoring and controlling the residual chlorine concentration in food plants, bottle washing processes, pools, and the like.

 [Related Art] Residual chlorine to which the present invention is applied is free chlorine dissolved in water and combined available chlorine such as chloramine. This is present in water due to chlorine gas or available chlorine, such as ash powder or hypochlorous acid, added for disinfection or sterilization or in processes such as deodorization and bleaching.

 Therefore, the purpose of measuring residual chlorine differs depending on whether the water content is relatively high or the wastewater is relatively thin. Here, the service water and the drainage are collectively referred to as the measured water.

 The residual chlorine concentration measurement sensor obtains an electric signal corresponding to the chlorine concentration remaining in the water to be measured, converts this electric signal with a converter, transmits the concentration display and various outputs to the inspection device, It is used for monitoring and management.

 FIG. 3 is a view showing an example of the structure of a conventional apparatus for cleaning beads for measuring residual chlorine concentration, in which (1) is a cross-sectional view and (2) is a plan view of (1). Absent. This has a water supply / drainage pipe 2 communicating with the water turbine room 1, through which water to be measured is supplied / drained from the arrow A to the arrow B. The water turbine room 1 has water turbine blades 3 which are rotated by a water flow, and an electrode 4 is arranged at the center of rotation of the water turbine room 1.

 FIG. 4 is a detailed enlarged view of the electrode 4 shown in FIG. 3, and the electrode 4 takes out an electric signal (current) to an anode 41 (for example, platinum of noble metal), a cathode 42 (for example, silver of base metal) and the outside. And a metal connector 44 and the like.

 In the electrode of the combination of the noble metal and the base metal, a current corresponding to the residual chlorine concentration of the water to be measured flows between the positive and negative electrodes according to the principle of the galvanic cell. In this case, the current flowing between the positive and negative electrodes causes the base metal of the cathode to adhere to the noble metal surface of the anode and become contaminated, thereby lowering measurement accuracy. In order to clean the noble metal surface of the anode, a glass bead chamber 6 containing an appropriate amount of glass beads 5 is provided.

 In other words, the blade 3 of the water wheel rotates according to the speed and flow rate at which the water to be measured is supplied and drained by the water supply / drain pipe 2, and the glass beads 5 in the glass bead chamber 6 flow while rotating along with the water to be measured with the rotation of the wing 3. Rinse the base metal powder from the cathode on the precious metal surface of the anode.

 In this way, the noble metal surface of the anode is cleaned so that a measurement current corresponding to the residual chlorine concentration contained in the water to be measured is obtained.

 In addition, since the current flowing from the anode to the cathode changes depending on the flow rate of the water to be measured flowing on the surface of the electrode, an overflow or the like must be provided in the water supply passage of the water to be measured in order to keep the flow rate of the water to be measured constant. It was necessary to provide them.

 [Problems to be solved by the invention] However, the rotation of the turbine blades related to the cleaning of the noble metal surface of the anode is closely related mainly to the speed and flow rate of the measured water, and the magnitude of the speed and flow rate In some cases, there was a problem that it was not possible to reliably wash off the stain of the base metal adhered to the noble metal surface by the glass beads.

 In addition, in order to perform stable measurement, it is necessary to keep the flow rate of the measured water constant.

 The purpose of the present invention is to solve these problems by simple means, reduce the influence of the speed and amount of water to be measured, and perform stable residual chlorine concentration measurement that enables good cleaning. .

 [Means for Solving the Problems] In order to achieve the above object, the present invention is arranged at the center of rotation of a water chamber provided with a water inlet and a drain of the measured water. A lead wire for leading a corresponding electric signal to a tester has a positive and negative electrode connected to a combination of a noble metal and a base metal, and the water turbine room has a water wheel having the positive and negative electrodes as a rotation center and the water wheel. It is characterized by comprising a glass bead chamber for cleaning dirt on the anode electrode surface, and a driving device for rotating the water wheel at a predetermined rotation speed is connected to a rotation shaft of the water wheel chamber.

 According to the present invention, since the water turbine is rotated at a predetermined speed by the driving device, even if the flow velocity at the inlet changes, the flow velocity on the electrode surface becomes constant and is affected by the velocity and flow rate of the water to be measured as in the conventional case. It has the effect of being able to perform stable measurement without any contamination, to be able to reliably clean dirt due to the adhesion of the base metal to the noble metal surface, and to accurately measure the residual chlorine concentration at all times.

 Further, since the blades of the water turbine room are not required, the structure and the assembly of the water turbine are simple and easy.

 [Embodiment of Consideration] This study uses a structure in which a constant speed motor is used as a drive device connected to the rotating shaft of a water turbine, and the glass beads in the glass bead chamber are stirred together with the water to be measured while maintaining a predetermined rotation speed. It is. Hereinafter, description will be made with reference to FIGS. 1 and 2.

 (Embodiment) FIG. 1 is a cross-sectional view showing the structure of a residual chlorine concentration measurement sensor in an embodiment of the present study, in which the electrode 4, the motor 10, and the motor rotating shaft 10S are not in a cross-sectional state. In FIG. 1, reference numeral 7 denotes a water supply pipe serving as a water supply port of the measured water, and reference numeral 8 denotes a drain pipe serving as a water discharge port of the measured water. These supply and drain pipes 7 and 8 are connected to the water turbine room 1.

Reference numeral 9 in the water turbine room denotes a water turbine, which has a water wheel shaft 91 below in the drawing. Reference numeral 10 denotes a constant speed motor as a driving device, and the motor rotating shaft 10S is connected to the water wheel shaft 91. An appropriate amount of glass beads 5 is stored in a glass bead chamber 6 provided in the water wheel 9, and a plurality of inlets and outlets (not shown) through which measured water flows into and out of the glass peas chamber 6. Having. The electrode 4 has the same structure as that of the conventional example shown in FIG. 4 and its explanation is omitted. The noble metal (platinum) and the base metal (silver) of the anode and the cathode of the electrode 4 are shown by way of example. It goes without saying that a combination of metals may be used.

 Next, the cleaning of the noble metal surface of the anode 41, which is the main point of the present invention, will be described. First, the measured water flowing from the water supply pipe 7 is discharged to the drain pipe 8 through the water turbine room 1. At this time, a current corresponding to the residual chlorine concentration contained in the measured water is supplied to the anode 41 and the cathode 42. Flowing between Also, regardless of the flow rate of the water to be measured flowing from the water supply pipe, the electrode surface has a constant flow velocity at a constant stirring speed of the beads.

 During this chlorine concentration measurement operation, the base metal (silver) of the cathode 42 elutes and adheres to the noble metal (platinum) surface of the anode 41 and becomes contaminated, so that a current corresponding to the residual chlorine concentration cannot be detected. Then, by rotating the motor 10 at a predetermined number of rotations, rotational force is transmitted from the constant speed motor rotation shaft 10S to the water wheel shaft 91, and the water wheel 9 rotates.

 As the water wheel 9 rotates, the glass beads 5 in the glass bead chamber 6 are stirred at a constant speed in the water to be measured, so that the flow rate of the water to be measured on the surface of the electrode becomes constant, and the noble metal of the anode 41 It serves to clean the base metal powder of the cathode 42 attached to the surface. During the cleaning, the base metal powder mixed into the water to be measured is discharged from the drain pipe 8. In this way, since the positive cathode always operates in a good condition, the residual chlorine concentration of the measured water can be accurately detected.

 FIG. 2 is a characteristic diagram showing the relationship between the flow rate of the measured water 1 / min (horizontal axis) and the output current (μA) (vertical axis) according to the present invention. In FIG. 2, (21) is a case of glass beads washing based on motor rotation in the present invention, and (22) is a stop of glass beads washing. Data. As is clear from FIG. 2, in the characteristic (22) corresponding to the conventional example, the output current has a considerable fluctuation (10 to 40 μA) in the usage range of the measured water (0 to 5 l / min) and is not stable. On the other hand, according to the characteristic (21) of the present invention, a stable output current (90 μA) is obtained in the range of 5 to 12 l / min as well as in the above-mentioned use range. In the characteristic diagram of FIG. 2, 4 to 10 V indicates a pump voltage.

 [Effects of the Invention] As described above, in the present invention, the water turbine in the water turbine room is rotated at a predetermined rotation speed by the driving device, and the flow rate of the water to be measured on the electrode surface is maintained by constant stirring of the glass beads in the glass bead chamber. As a result, a stable measurement is possible, and the base metal of the cathode adhering to the noble metal surface constituting the anode is always washed, so that a current corresponding to the residual chlorine concentration of the water to be measured can be correctly obtained from the electrode. Moreover, since the water turbine room does not require the conventional wings, the structure is simple and the assembly is easy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a residual chlorine concentration measuring sensor according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing the relationship between the measured water and the output voltage according to the present invention.

FIG. 3 is a diagram showing a configuration example of a conventional residual chlorine concentration measurement sensor.

FIG. 4 is a detailed enlarged view of the electrode of FIG. 3;

[Explanation of symbols]

 1. Watermill room 4. Electrode 5. Glass beads 6. Glass bead room 7. Water supply pipe 8. Drain pipe 9. Water wheel 10. Motor 10S. Motor rotation axis 41. Anode 42. Cathode 43. Lead wire 91. Water axle

Claims (1)

[Utility model registration claims] 1. A lead wire, which is arranged at the center of rotation of a water turbine chamber provided with a water inlet and a water outlet of a measured water and leads an electric signal corresponding to a residual chlorine concentration of the measured water to an inspection device, is connected. A positive and negative electrode that becomes a combination of a precious metal and a base metal is provided, and the water wheel chamber is a water wheel with the positive and negative electrodes as a rotation center and a glass bead chamber for cleaning dirt on the anode electrode surface. A residual chlorine concentration measurement sensor, wherein a driving device configured to rotate the water wheel at a predetermined rotation speed is connected to a rotation shaft of the water wheel.