JP4174981B2 - Water quality meter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water quality meter such as a residual chlorine meter and a pH meter, and more particularly to improvement of means for cleaning an electrode in water.
[0002]
[Prior art]
In the water quality meter in the prior art, there are various types of water quality meters in which the electrodes are washed.
[0003]
The structure for cleaning the electrode of the water quality meter (for example, residual chlorine meter) of the first specific example is a polarographic method using a rotating metal rod as shown in FIG. This enables stable measurement over a long period of time, separating the container for flowing test water into two rooms, arranging the counter electrode 12 in one room 11a, and two in the other room 11b. Electrode, that is, the working electrode 13 and the rotating electrode 14 facing the installed working electrode 13, and the bottom of the working electrode 13 provided in the other chamber 11b is inclined, Further, a predetermined amount of glass beads 15 are spread over a position corresponding to the tip portion of the rotating electrode 14.
[0004]
In the electrode having such a structure, since the rotating electrode 14 is rotating, the glass beads 15 in the test water 16 come into contact with the rotating electrode 14 to clean the electrode.
[0005]
As shown in FIG. 3, the structure for cleaning the electrode of the water quality meter (for example, residual chlorine meter) of the second specific example fixes the electrode 21, moves the small glass bead 26 with a water flow, and hits the gold electrode at the tip. This is a downsized structure. The structure is such that a narrow tube 22 for inputting the test water 16 is disposed in the container 21 for inputting the test water 16 so as to extend to the vicinity of the bottom of the container 21, and the bottom of the container 21 is formed in a conical shape 23. An electrode 25 having a gold electrode 24 at the tip is disposed in a direction toward the bottom formed on the electrode 23. Then, a certain amount of glass beads 26 are spread on the bottom of the conical shape 23. In addition, an overflow outlet 27 is provided in the upper direction of the container 21 to discharge the test water.
[0006]
In the electrode having such a structure, when the test water 16 supplied by the narrow tube 22 hits the bottom surface of the bottom of the conical shape 23, the electrode is reversed. At this time, the glass beads 26 are rolled up and the dirt is removed by hitting the gold electrode 24 at the tip of the electrode 25.
[0007]
As shown in FIG. 4, the structure for cleaning the electrodes of the water quality meter (for example, residual chlorine meter) of the third specific example is such that the electrode 32 is disposed at the bottom of the container 31 to which the test water 16 is input, and the structure is faced. The electrode 32 has a structure including a water sample inlet 33 for inputting water from the lateral direction, and a glass bead 34 is spread over the electrode 32 facing the bottom.
[0008]
Thus, when the test water 16 is supplied from the test water inlet portion 33 provided in the lateral direction of the bottom surface so that the glass beads 34 are always in contact with the electrode 32, the glass beads 34 are rolled up while being in contact with the electrode 32, When the glass beads 34 collide with the electrode 32 in the vortex of the test water 16, the tip portion of the electrode 32 is washed.
[0009]
As shown in FIG. 5, the structure for cleaning the electrode of the water quality meter (for example, residual chlorine meter) of the fourth specific example has a water detection inlet portion 36 for inputting the water sample 16 to the bottom 37 of the water sample container 35. The electrode 38 is disposed at a position a predetermined distance above the test water inlet 36 provided on the bottom 37, and the mesh 39 is disposed on the water test inlet 36 of the bottom 37. It has a structure in which a predetermined amount of glass beads 40 are spread.
[0010]
In this way, the glass beads 40 are brought into contact with the electrode 38 at an upper position at a predetermined distance from the bottom 37 of the water sampling inlet 36. That is, when the test water 16 is supplied from the bottom 37, the glass beads 40 are blown up like a fountain, and the electrodes 38 are washed by colliding with the opposing electrodes 38.
[0011]
[Problems to be solved by the invention]
However, in the method of cleaning various electrodes described in the prior art, there is a problem that only the fine glass beads can be stirred because the flow rate of the test water is small.
[0012]
In addition, when the flow rate and flow rate fluctuate, the movement of the glass beads changes, resulting in a problem that the cleaning effect is not constant and the cleaning power is weakened.
[0013]
Furthermore, in the case of a rotating electrode that rotates the electrode in a glass bead, the test water can be expected to have a cleaning effect even in dirty water such as river water, but a signal can be output from the rotating electrode with a small contact resistance. There is also a problem that the function of taking out is required and the structure and structure become complicated.
[0014]
Therefore, even if the structure is simple, there is a problem that must be solved in a configuration that can clean the electrodes reliably and accurately.
[0015]
[Means for Solving the Problems]
In order to solve the above problems, water meter according to the present invention is obtained by the following configuration.
[0016]
(1) A water quality meter including an input unit for inputting test water, and a container including an electrode disposed at a position where the input test water is impregnated,
A check valve provided on the outlet side of the container, opening the valve when the water pressure in the container becomes equal to or higher than a predetermined value ,
Means comprising a bellophram and a return spring, and reciprocating so as to expand and contract in a predetermined direction according to the water pressure in the container in conjunction with the movement of the Chiech valve;
A shaft fixed to a member that reciprocates in conjunction with expansion and contraction of the bellophram;
A brush attached to the shaft for cleaning the electrode;
It is characterized by comprising.
(2) The water quality meter according to claim 1, wherein the water quality meter measures an amount of dissolved chlorine in the test water.
(3) The water quality meter according to claim 1, wherein the water quality meter measures a pH value in the test water.
[0017]
In this way, a brush is attached to the tip of the bellophram that reciprocates the free end of the electrode for detecting chlorine remaining in the test water using the water pressure of the test water. Since the brush can be brought into direct contact with the electrode by cleaning the end portion as if it is wiped, an accurate and reliable cleaning effect can be generated.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a water quality meter (here, a residual chlorine meter) according to the present invention will be described with reference to the drawings.
[0019]
As shown in FIG. 1, the water quality meter of the present invention (here, the residual chlorine meter) includes a test water input unit 54 that is a test water inlet for inputting test water, and a position where the input test water is impregnated. A container 51 having a pair of electrodes disposed on the surface, and a measuring unit 52 that is a measuring means for applying a voltage to the pair of electrodes and measuring a free effective chlorine concentration in the test water based on a current flowing between the pair of electrodes. It has a configuration with.
[0020]
The container 51 has a container housing 53 for inputting test water, a test water input part 54 for inputting test water into the container housing 53, a comparison electrode 55 arranged in a state facing the inside of the container housing 53, A working electrode 56 having a free end portion disposed in a standing state at the bottom of the container housing, a counter electrode (not shown) at the back side of the working electrode 56, and a left opening of the container housing 53 in the drawing. A bellophram part 57 formed in a size and a check valve part 59 provided at a water detection outlet 58 at an upper position of the container housing 53 are included.
[0021]
The bellophram portion 57 includes a bellophram housing 60 having an opening on the right side in FIG. 1, a cap nut 61 that closely engages the container housing 53 and the bellophram housing 60 from the outside, and a center position of the bellophram housing 60. A central shaft 62, a return spring 63 engaged with the central shaft 62, an outer side wall surface of the bellowram housing 60, and a fixing nut 64 that supports the central shaft 62 and adjusts the pressure. , A cylinder 65 connected to the return spring 63 and slidably mounted on the center shaft 62; a bellowram 66 for moving the cylinder 65; and a tip portion of the center shaft 62 provided at a position outside the bellofram 66. The brush portion 67 provided in the above and the bellophram press fitting 6 for attaching the base end portion of the brush portion 67 to the bellophram 66 Consisting of.
[0022]
The brush portion 67 includes a rod-shaped shaft portion 69 attached to the cylinder 65 and a brush 70 provided at the tip portion of the shaft portion 69 and attached so as to wipe the free end portion of the working electrode 56. The brush 70 cleans the free end of the working electrode 56 by wiping the free tip of the working electrode 56 by reciprocation.
[0023]
The check valve portion 59 is attached to a water detection outlet 58 provided at an upper position of the container housing 53, and has a check valve 73 in the discharge hole, and is closed inside the body 71 by the biasing force of the spring 74. The piston 72 is in a pressure state, a check valve 73 provided at the lower end of the piston 72, and a washer 75 provided between the piston 72 and the spring 74.
[0024]
In such a configuration, when the water pressure of the test water inside the container 51 rises above a predetermined water pressure, the piston 72 rises against the urging force of the spring 74, thereby opening the check valve 73 and discharging the test water. When the water pressure is lower than a predetermined level, the piston 72 is lowered by the biasing force of the spring 74, the check valve 73 is closed, and the discharge of the test water is stopped.
[0025]
Next, the operation in the electrode cleaning structure of the water quality meter (here, residual chlorine meter) having the above structure will be described.
[0026]
First, when the check valve 73 is closed and the test water cannot be discharged, the water pressure inside the container 51 rises, and the piston 72 rises against the urging force of the spring 74 of the check valve 73 to increase the check valve. When 73 is opened, the test water in the container 51 is discharged and the water pressure decreases. Then, as the water pressure decreases, the cylinder 65 moves toward the inside of the container 51 by being pushed by the spring 63, and the brush 70 wipes the free end of the working electrode 56 along with this movement.
[0027]
At the same time as the operation of wiping up to a predetermined position, when the water pressure inside the container 51 becomes equal to or lower than the predetermined pressure, the piston 72 descends by the restoring force of the spring 74 and the check valve 73 is closed to close the inside of the container 51. At the same time, the brush 70 that has been wiped to a predetermined position returns the cylinder 65 in the reverse direction against the urging force of the spring 63, so the brush 70 also moves in the reverse direction. At this time, since the water pressure inside the container 51 again becomes a predetermined water pressure or higher, the cylinder 65 does not move in the direction of the working electrode 56.
[0028]
In this way, the cylinder 65 can be reciprocated using the increase / decrease of the water pressure inside the container 51 by opening and closing the check valve 73, and the free end of the working electrode 56 can be reciprocated and wiped by the brush 70. It is.
[0029]
The foregoing description of the present invention has only shown certain preferred embodiments for purposes of illustration and illustration. Accordingly, it will be apparent to those skilled in the art that the present invention can be modified and modified in many ways without departing from the essence thereof.
[0030]
For example, although a residual chlorine meter is shown in this embodiment, it may be used for a pH meter, and can be applied to other water quality meters that require electrode cleaning. The scope of the present invention defined by the description in the appended claims is intended to include modifications and variations within the scope.
[0031]
【The invention's effect】
As described above, since the water quality meter according to the present invention wipes the electrode by the reciprocating motion of the brush using the water pressure in the container into which the test water is introduced, the electrode can be reliably and accurately cleaned. Can do.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an electrode structure of a water quality meter according to the present invention.
FIG. 2 is a cross-sectional view of the electrode structure of a water quality meter according to a first specific example in the prior art.
FIG. 3 is a cross-sectional view of a structure of an electrode of a water quality meter according to a second specific example in the prior art.
FIG. 4 is a cross-sectional view of the electrode structure of a water quality meter of a third specific example in the prior art.
FIG. 5 is a cross-sectional view of the electrode structure of a water quality meter according to a fourth specific example in the prior art.
[Explanation of symbols]
51 Container 52 Measuring section 53 Container housing 54 Water detection input section 55 Comparative electrode 56 Working electrode 57 Bellofram section 58 Detection outlet section 59 Check valve 60 Bellofram housing 61 Cap nut,
62 Center shaft 63 Return spring 64 Fixing nut 65 Cylinder 66 Bellofram 67 Brush part 68 Bellofram presser fitting 69 Shaft part 70 Brush 71 Body 72 Piston 73 Check valve 74 Spring 75 Washer

Claims (3)

A water quality meter including an input unit for inputting test water, and a container including an electrode disposed at a position where the input test water is impregnated,
A check valve that is provided on the outlet side of the container, opens the valve when the water pressure in the container becomes equal to or higher than a predetermined value, and closes the valve when the water pressure becomes equal to or lower than a predetermined water pressure ;
Means comprising a bellophram and a return spring, and reciprocating so as to expand and contract in a predetermined direction according to the water pressure in the container in conjunction with the movement of the Chiech valve;
A shaft fixed to a member that reciprocates in conjunction with expansion and contraction of the bellophram;
A brush attached to the shaft for cleaning the electrode;
Water meter characterized in that it consists of. The said water quality meter measures the amount of dissolved chlorine in the said test water, The water quality meter of Claim 1 characterized by the above-mentioned. The water quality meter according to claim 1, wherein the water quality meter measures a pH value in the test water.

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