JP5927800B2 - Cleaning device - Google Patents

Description

  The present invention relates to a cleaning device for removing contaminants adhering to a sensor of a water quality detector by the action of compressed gas.

In water quality detectors such as pH meters and ORP meters that continuously measure the quality of river water, lake water, and industrial water, detection capability is achieved when various pollutants in sample water adhere to the sensor immersed in the sample water. The analysis accuracy decreases.
For this reason, for example, in Patent Literature 1 and Patent Literature 2, the compressed gas is rapidly expanded in the sample water by intermittently injecting the compressed gas toward the sensor from the cleaning air jet port immersed in the sample water. By generating a high-speed water flow containing bubbles, the synergistic effect of this water flow and the vibration of the pollutant itself due to the disorderly contact between the sample water and the boundary of the bubble with the pollutant attached to the sensor, A cleaning device is disclosed in which a sensor is cleaned by efficiently removing contaminants.

Shoko 16-16523 JP2007-190535

  However, sample water often contains solids such as sand and crystals, and the conventional cleaning devices have many water quality sensors facing downward, so the entire sensitive surface can be efficiently removed. The opening of the air flow path (cleaning air outlet) faces the sensitive surface and faces directly upward so that it can be cleaned. For this reason, solids such as sand and crystals in the sample water fall into the air flow path, stay there, and are jetted together with the compressed gas from the cleaning air jet outlet during cleaning to break the sensor at high speed. There was a problem of doing.

  On the other hand, in the past, a device has been devised in which a small amount of air is allowed to flow out of the cleaning air outlet during a period when the cleaning operation is not performed, so that the solid matter does not accumulate in the air flow path. Since the jet outlet is arranged, there is a problem that the sensor is always exposed to the air and the measured value is affected, for example, the indication fluctuates.

  Therefore, the problem to be solved by the present invention is that the water quality can be prevented by preventing solids such as sand and crystals from colliding with the sensor during cleaning without affecting the measurement value with a simple configuration. It is to provide a cleaning device for a detector.

In order to achieve the above object, the present invention employs the following configuration.
[1] By the action of the compressed gas jetted from the cleaning air jet port in the sample water, the pollutant adhered to the site to be cleaned of the water quality detector comprising the sensor, the sensor holder, and the protective cylinder is immersed. A cleaning device that generates and removes a high-speed water flow containing bubbles, the cleaning device including an air flow path that communicates with the cleaning air outlet and extends substantially perpendicularly to the sensor. Compressed gas, which is provided below the lower end of the site to be cleaned on the inner peripheral surface of the protective cylinder and is supplied to the cleaning air jet through the air flow path, is cleaned from the side direction of the sensor. A cleaning apparatus, characterized in that solid matter that is ejected downward from the lower end of the target portion and that has entered the air flow path does not collide with the cleaning target portion .
[ 2 ] The air flow path communicating with the cleaning air outlet has a bent portion bent in a substantially L shape with an inner angle of 90 degrees or more and 180 degrees or less, and the cleaning air outlet is formed of the protective cylinder. The cleaning apparatus according to claim 1, wherein the cleaning apparatus is provided at an inner peripheral surface of the air flow path and at a tip extending obliquely downward of the air flow path.

  According to the present invention, the cleaning air outlet is disposed on the inner peripheral surface of the protective cylinder so that the cleaning air outlet does not open upward (in the water surface direction). It is difficult to enter the air flow path and to collect. For this reason, it is possible to prevent the cleaning target part (sensor) from being damaged by the collision of the solid matter. In addition, it is not necessary to cause a small amount of air to flow out of the air flow path and to constantly expose the sensor to the air during a period when the cleaning operation that is performed to prevent solids from entering the air flow path is not performed. . As a result, a simple configuration can be obtained, and measurement values such as fluctuations in instructions are not affected.

  Furthermore, according to the configuration of the present invention, the momentum of the high-speed water flow including bubbles generated by the rapid expansion of the compressed gas in the sample water and the contaminants adhering to the site to be cleaned (sensor) are mixed with the sample water and the bubbles. Due to the synergistic effect of the vibration of the pollutant itself due to the disorderly contact of the boundary part, the pollutant is efficiently removed and cleaned, so even if the compressed gas is not directly injected to the site to be cleaned, sufficient cleaning power is obtained. Can be obtained. Therefore, since the cleaning air outlet is located below the lower end of the cleaning target portion of the water quality detector, the solid matter that has entered the air flow path is secured to the cleaning target portion (sensor) while ensuring sufficient cleaning power. ), And it is possible to prevent damage to the cleaning target part (sensor) due to solid collision.

It is a perspective view which shows the principal part of the water quality detector with which embodiment of this invention is applied. It is the longitudinal cross-sectional view and bottom view of a protection cylinder, a washing | cleaning part, etc. which are shown in FIG. It is principal part sectional drawing which shows typically the structure of a protection cylinder, a washing | cleaning part, etc. which are shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a main part of a pH detector as a water quality detector to which the present embodiment is applied. In FIG. 1, 10 is a water quality detector immersed in sample water, 11 is a cylindrical sensor holder, 12 is a protective cylinder connected to the lower end of the sensor holder 11, and 13 is a glass disposed in the protective cylinder 12. A sensor composed of an electrode, a comparison electrode, and the like, 14 is a cleaning unit for cleaning the sensor 13 in which an air flow path 15 and a cleaning air jet 16 described later are formed, and 17 is for supplying compressed gas to the cleaning unit 14 This is a gas supply tube.

  The gas supply tube 17 is connected to a compressed gas supply unit (not shown) and is supplied with compressed gas. The compressed gas supply unit includes, for example, an air tank, a gas supply tube connection port connected to the air tank, and an electromagnetic valve positioned between the air tank and the gas supply tube connection port. The gas supply tube connection port is connected to the gas supply tube 17, and the compressed gas is supplied to the cleaning unit 14 via the gas supply tube 17 by opening the electromagnetic valve.

The sensor 13 is held by a rubber packing (not shown) at the lower end of the sensor holder 11. The rubber packing seals the lower end portion of the sensor holder 11 in a watertight manner, is pressed by a flange portion provided on the upper portion of the protective cylinder 12, and is prevented from being detached by screwing the protective cylinder 12 to the sensor holder 11. ing.
The attachment position of the sensor 13 can be adjusted by moving the holding position by the rubber packing up and down.

  FIG. 2A is a longitudinal sectional view of the protective cylinder 12, the cleaning unit 14, and the like, and FIG. 2B is a bottom view of the same. In these drawings, reference numeral 14a denotes a connecting portion to which the lower end portion of the gas supply tube 17 is connected, 15 denotes an air flow path through which the compressed gas is supplied in communication with the connecting portion 14a, and 16 denotes in communication with the air flow path 15. The cleaning air jet port from which the compressed gas opened to the inner peripheral surface of the protective cylinder is jetted is shown.

  The protective cylinder 12 is made of a cylindrical member, and is provided with a plurality of notches so that the sample water can be easily replaced. And the part other than the notch that is placed so as to surround the sensor is the protective part of the sensor, so that it can prevent the sensor from being damaged by hitting something due to mishandling during installation or maintenance inspection. It has become.

  A block-like member that is the cleaning unit 14 is welded and fixed to a wide portion having strength among the protective units of the protective cylinder 12. A cleaning air jet 16 is formed on the inner peripheral surface of the protective portion of the protective cylinder 12 to which the block-shaped member is fixed, and an air flow path 15 is formed inside the block-shaped member. The connecting portion 14 a communicating with the air flow path 15 is connected to the lower end portion of the gas supply tube 17, and the compressed gas supplied to the cleaning unit 14 via the gas supply tube 17 is connected to the connecting portion 14 a and the air flow path. 15 is supplied to the cleaning air jet port 16 via 15, and is jetted from the cleaning air jet port 16 toward the sensor 13.

For example, after the cleaning unit 14 welds a block-shaped member to the protective cylinder 12, the cleaning air jet 16 and the air flow path 15 are formed by drilling from the inner peripheral surface of the protective cylinder 12. Thereafter, the connecting portion 14a and the air flow path 15 can be formed by drilling from the top of the block-shaped member.
However, the cleaning unit 14 is not limited to a block-like member, and for example, a commercially available product such as an elbow, a substantially L-shaped tube, or a joint may be used.

  FIG. 3 is a cross-sectional view of an essential part schematically showing the configuration of the protective cylinder 12, the sensor 13, and the cleaning unit 14. 3 (a) and 3 (b), the shape of the air flow path 15 is different. 3A is opposed to the sensor 13 and the air flow path 15 extends substantially vertically, whereas in the configuration of FIG. 3B, the inner angle of the bent portion of the air flow path 15 is large. The cleaning air jet 16 is formed at the tip extending obliquely downward.

Next, the operation of this embodiment will be described.
As shown in FIGS. 1, 2, and 3, the compressed gas is supplied to the cleaning unit 14 and the air flow path 15 via the gas supply tube 17, and finally from the cleaning air jet 16 to the sensor 13 (cleaning target region). )
The compressed gas rapidly expands in the sample water and generates a high-speed water flow containing bubbles. Due to the synergistic effect of the vigor of the high-speed water flow and the vibration of the pollutant itself due to the disorderly contact of the boundary between the sample water and the bubbles with the pollutant adhering to the sensor 13, the pollutant is efficiently removed. Is washed. Accordingly, sufficient cleaning power can be obtained even if the compressed gas is not directly injected toward the cleaning target portion of the sensor 13. That is, the cleaning air jet port 16 does not need to be disposed directly beside the site to be cleaned of the sensor 13.

  The compressed gas is adjusted so that the air filled in the air tank or the instrumentation air has a predetermined pressure. The cleaning operation is performed at a predetermined cleaning cycle by controlling the supply of compressed gas by a controller having a timer function for opening and closing an electromagnetic valve or the like according to a predetermined sequence.

As shown in FIG. 2, the cleaning air outlet 16 is located on the inner peripheral surface of the protective cylinder 12. For this reason, the solid matter in the sample water does not easily enter the air flow path 15 of the cleaning unit 14 and does not easily accumulate.
Therefore, when the compressed gas is ejected from the cleaning air jet port 16, the solid matter is not injected toward the sensor 13, and damage to the portion to be cleaned due to the collision of the solid matter can be prevented.

  In addition, as shown in FIG. 3A, even if solid matter enters and accumulates in the air flow path 15 of the cleaning unit 14, the cleaning air ejection port 16 is positioned below the lower end of the sensor 13. Therefore, the solid matter that has entered the air flow path 15 of the cleaning unit 14 is not directly jetted toward the sensor 13 at high speed, and the sensor 13 is prevented from being damaged by the collision of the solid matter. be able to.

Further, when the holding position of the sensor 13 by the rubber packing is moved downward and the sensor 13 is pushed into the sensor holder 11, the mounting position of the sensor 13 is moved further upward than the cleaning air jet 16. Can do. For this reason, the compressed gas ejected from the cleaning air ejection port 16 can be ejected relatively below the sensor 13.
Thereby, the probability that the solid matter collides with the sensor 13 at a high speed can be further reduced, and the damage of the sensor 13 can be prevented.
However, since the cleaning effect is impaired if the sensor 13 is moved too much upward, for example, adjustment is made so that the lower end of the sensor 13 is positioned about 5 mm above the upper end of the cleaning air jet 16. Is preferred.

In the configuration of FIG. 3B, as described above, the inner angle of the bent portion of the air flow path 15 is large, and the cleaning air jet port 16 is provided at the tip extending obliquely downward. Therefore, the embodiment of FIG. 3B is more difficult to infiltrate into the air flow path 15 of the cleaning unit 14 and collect more easily than the embodiment of FIG. The compressed gas to be ejected can be relatively ejected further below the sensor 13.
Thereby, the embodiment of FIG. 3B can reduce the probability that the solid material is jetted relatively directly toward the sensor 13 and can prevent the sensor 13 from being damaged.

  According to the above-described embodiment, the system of the present invention can be replaced by simply exchanging parts such as a conventional protective cylinder and a cleaning unit.

  Note that what can enter and accumulate in the cleaning unit 14 includes not only the above-mentioned solid matter but also foreign matters such as sludge (insoluble and hardly soluble substance), but is not limited thereto.

DESCRIPTION OF SYMBOLS 10: Water quality detector 11: Sensor holder 12: Protection cylinder 13: Sensor 14: Cleaning part 14a: Connection part 15: Air flow path 16: Cleaning air jet 17: Gas supply tube

Claims (2)

A water quality detector consisting of a sensor, a sensor holder, and a protective cylinder contains bubbles due to the action of compressed gas jetted from a cleaning air jet in the sample water. A cleaning device that generates and removes high-speed water flow ,
An air passage that communicates with the cleaning air outlet and extends substantially perpendicularly to the sensor;
The cleaning air spout is provided below the lower end of the cleaning target portion on the inner peripheral surface of the protective cylinder,
The compressed gas supplied to the cleaning air outlet through the air flow path is ejected from the side of the sensor toward the lower side of the lower end of the cleaning target portion , and enters the air flow path. A cleaning apparatus configured to prevent an object from colliding with the site to be cleaned. The air flow path communicating with the cleaning air outlet has a bent portion bent in a substantially L shape with an inner angle of 90 degrees or more and 180 degrees or less,
The cleaning apparatus according to claim 1, wherein the cleaning air ejection port is provided at an inner peripheral surface of the protection cylinder and at a tip extending obliquely downward of the air flow path.

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