JPS59225346A - Gas-liquid mixing pump apparatus - Google Patents

Abstract

PURPOSE:To simplify and miniaturize the titled apparatus and to facilitate the maintenance thereof, by performing a process, wherein the chemical liquid collected in a metering tank is diluted and gas is introduced into an aspirator tube under pressure to completely deliver the diluted chemical liquid in the metering tank, in a series of operation. CONSTITUTION:When a three-way solenoid valve 3 is changed over to open the outer end of a gas introducing pipe 2 to the open air and a solenoid opening and closing valve 16 is opened, the chemical liquid in a chemical liquid storage tank 14 is downwardly flowed into a metering tank 1 and, when the chemical liquid level reaches the height of the lower end part of a chemical liquid conduit 15, the flowing-down of the chemical liquid is automatically stopped. When a solenoid opening and closing valve 16 is closed and a solenoid opening and closing valve 10 is opened, fresh water is flowed into the metering tank 1 to dilute the chemical liquid. A float valve 5 rises to stop the flowing-in of fresh water which is, in turn, flowed out from the outer end of a gas-liquid delivery pipe 7 and the flowing-out from the outer end thereof is also stopped with the closing of the solenoid opening and closing valve 10. When the three-way solenoid valve 3 is changed over to operate a gas pump 4 and gas is introduced into a gas introducing pipe 2 under pressure, the diluted chemical liquid is flowed into an aspirator tube 2 and flowed out along with the gas from the outer end of the gas-liquid delivery pipe 7. In this case, a control circuit is provided to automatically and continuously perform the above-mentioned entire operations.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for mixing and delivering gases and liquids, e.g.
The present invention relates to a gas-liquid mixing pump device suitable for automatic cleaning of H measurement electrodes, etc.

For example, in an industrial pH measuring device that continuously measures the pH of factory wastewater or river water, etc. over a long period of time, the electric fence for pH measurement is immersed in the test liquid for a long period of time. The sagging inside adheres to the electrodes, causing measurement errors, and in extreme cases, it may become impossible to measure. For this reason, it is necessary to clean the electrode surface at appropriate intervals, and various cleaning devices have been proposed and implemented in the past, but the present inventor also developed a gas-liquid mixing pump device suitable for automatic electrode cleaning. Proposed.

(Patent application 1973-27327) When using this system,
By spraying a mixture of air and cleaning chemicals toward the electrodes in a protective cylinder that mechanically protects the electrodes, the test liquid in the protective cylinder is replaced with air, and the chemicals in the sprayed mixture adhere to the electrodes. This eliminates the need to pull up the electrode from the test liquid during cleaning, and the test liquid around the electrode is replaced with air, making it possible to perform effective cleaning. On the other hand, it has the advantage of shortening the interruption time of measurements, etc., but it also reduces the amount of chemicals/liquids that remain on the electrode surface and the inner wall of the gas-liquid injection nozzle, which gradually dissolves into the test liquid. To prevent indication errors caused by the chemical solution, clean water is sprayed to remove the chemical solution f that remains on the nozzle inner wall and electrode surface.
! - If you want to remove it, it is necessary to add a clean water injection mechanism, and use a commercially available chemical solution (e.g. 35% hydrochloric acid) manually diluted to an appropriate concentration as the cleaning chemical solution. Not only does this dilution adjustment require a relatively large amount of labor and time, but also the amount of the diluted chemical solution required for storage is approximately 200 times the amount required for one cleaning. Since the system is equipped with a chemical solution storage tank with a volume of Can not.

The present invention can be configured to be simple and compact, and is easy to maintain.
For example, the object is to realize a gas-liquid mixing pump device suitable for automatic cleaning of industrial pH measurement electrodes.

Fig. 1 is a diagram showing an embodiment of the present invention, in which 1 is a closed measuring tank, 2 is a gas injection pipe, and the inner end is kept airtight between the tank wall of the measuring tank 1 and inside the tank. The outer end is connected to the air pump 4 via the three-way solenoid valve 3, and is opened to the atmosphere when the three-way solenoid valve 3 is switched. Reference numeral 5 designates a float valve which has sufficient buoyancy against fresh water, and whose conical upper end presses against the inner wall surface of the sheathing part 6 of the gas injection tube 2, thereby allowing the valve to float outward from the inner end of the gas injection tube 2. Blocks fluid flowing toward the end. Reference numeral 7 denotes a gas-liquid delivery pipe, which is inserted into the measuring tank 1 with its inner end opened to the wall of the measuring tank 1 in an airtight manner. 8 is a check valve, 9 is a fresh water inlet pipe, one end of which is connected to a fresh water supply source, for example, a road outlet (not shown) via an electromagnetic on-off valve 10, and the other end is connected to a road outlet (not shown). through the check valve 11 to the gas-liquid delivery pipe 7
A branch connection is made between the check valve 8 and the insertion portion into the measuring tank 1. Reference numeral 12 denotes a connecting pipe that connects the intermediate portion between the outer end of the gas-liquid delivery pipe 7 and the stop valve 8, the inside of the fresh water inlet pipe 9, and the intermediate portion between the electromagnetic on-off valve 10 and the check valve 11.

13 is a check valve; 14 is a closed type chemical liquid storage tank; 15 is a chemical liquid conduit whose upper end is connected to the bottom of the chemical liquid storage tank 14; Insert it into the measuring tank 1 while keeping it airtight. Reference numeral 17 denotes an aspirator tube, which is provided to connect the outlet end of the gas injection tube 2 and the inner end of the gas-liquid delivery tube 7. Aspirator tube 17 on the 1st
One or more communicating holes are bored depending on the diameter of the hole. Note that instead of forming the gas injection pipe 2, the gas-liquid delivery pipe 7, and the aspirator pipe 17 separately and connecting them to each other, they may be formed continuously and integrally.

Further, although it is almost impossible in reality, it is necessary to configure the structure so that the difference in height between the measuring tank 1 and the medicine a storage tank 14 does not exceed 10 m.

When the three-way solenoid valve 3 is switched to open the outer end of the gas injection pipe 2 to the atmosphere via the three-way electromagnetic valve 3, the inside of the measuring tank 1 is exposed to the atmosphere via the communication hole 18, the aspirator pipe 17, and the gas injection pipe 2. Since the electromagnetic on-off valve 16 is kept in an open state, when the electromagnetic on-off valve 16 is opened, the chemical liquid in the chemical liquid storage tank 14 flows down into the measuring tank 1 via the electromagnetic on-off valve 16 and the liquid conduit 15, and the liquid level in the measuring tank 1 is lowered. When the liquid reaches the height of the lower end of the chemical liquid conduit 15, the chemical liquid storage tank 1
4 is formed in a closed type, the lower end of the chemical liquid groove #15 is sealed by the liquid level, and the flow of the chemical liquid is automatically stopped.

Therefore, weighing tank 1. Since a certain amount of the chemical liquid will be collected in the measuring tank 1 according to the dimensions of the chemical liquid conduit 15 and the height of the ■ end of the chemical liquid conduit 15, it is possible to change the height of the ■ end of the chemical liquid conduit 15. By forming it, it is possible to collect any given amount of drug solution.

After collecting a certain amount of chemical solution into the measuring tank 1, the electromagnetic on-off valve I6
When the electromagnetic on-off valve 10 is closed and the electromagnetic on-off valve 10 is opened, the electromagnetic on-off valve 1
Fresh water flows into the metering tank 1 through the inflow pipe 9, check valve 11, gas-liquid delivery pipe 7, aspirator pipe 17, and communication hole 18, and dilutes the previously sampled chemical solution.

As the level of the diluted chemical solution in the measuring tank 1 rises, the level of fresh water flowing into the gas injection pipe 2 via the aspirator pipe 17 also rises, causing the float valve 5 to rise. When the upper end of the float valve 5 is pressed against the inner wall surface of the fitting part 6 of the gas injection pipe 2, fresh water flows into the gas injection 12 and the metering tank 1.
Until the nine people stopped and the electromagnetic on-off valve 10 was closed,
The fresh water flows out from the outer end of the gas-liquid delivery pipe 7 exclusively through the flow paths of the check valves 13 and υ/connecting pipe 12 and the flow paths passing through the check valves 11 and 8, and closes the electromagnetic on-off valve 10. Accordingly, the outflow from the outer end is also stopped. The amount of fresh water that has flowed into the measuring tank l is determined by the difference between the height of the dilution@liquid level ≧ and the height of the lower end of the chemical liquid conduit 15 when the float valve 5 closes the opening part 6 of the gas injection pipe 2. Therefore, the medicinal solution collected in the measuring tank 1 can always be diluted at a rate of one foot. Therefore, by changing the height of the F end of the chemical liquid conduit 15, the amount of the medical liquid to be collected can be changed (and the dilution rate of the chemical liquid can also be changed).

Next, the three-way solenoid valve 3 is switched to connect the gas injection pipe 2 to the gas pump 4, and when the gas pump 4 is activated to pressurize gas into the gas injection pipe 2, the float valve 5 moves back and 6 opens, gas flows into the aspirator pipe 17 while causing the fresh water remaining in the aspirator pipe 17 and the gas-liquid delivery pipe 7 to flow out from the outer end of the gas-liquid delivery pipe 7 via the check valve 8. Due to the rough speed, the pressure at the opening in the pipe of the communication hole 18 decreases, and the head pressure of the diluted chemical solution in the measuring tank 1 is applied to the pipe opening of the communication hole 18, so that the diluted chemical solution flows into the communication hole 18. The gas flows into the aspirator tube 17 through the check #8, and flows out together with the gas from the outer end of the gas-liquid delivery tube 7 through the check #8.

If the aspirator pipe 17 is provided at the lowest part of the measuring tank 1 and the communicating hole 18 is bored in the downward wall of the aspirator pipe 17, the diluted chemical solution in the measuring tank I will be transferred to the communicating hole 18 of the aspirator pipe 17. Most of the diluted chemical liquid flows out from the outer end of the gas-liquid delivery pipe 7 together with the gas, leaving only a small amount of the diluted chemical liquid in the gap between the opening surface and the inner bottom wall of the measuring tank 1.

When the diluted chemical solution in the measuring tank 1 has been delivered, the operation of the gas pump 4 is stopped and the three-way solenoid valve 3 is switched to keep the gas injection pipe 2 open to the atmosphere via the three-way solenoid valve 3 for the next time to collect the chemical solution. and prepare for dilution.

All of the above operations can be performed automatically and continuously by providing a control circuit that sends out appropriate program signals to control the operations of each electromagnetic valve, gas pump, etc.

When using the device of the present invention to clean, for example, an industrial pH metering electrode, a gas-liquid injection nozzle 19 is attached to the outer end of the J gas-liquid delivery pipe 7, as shown in FIG. The spray direction is directed toward the electrode 20 to be cleaned, and the tip of the nozzle 19 is fixed so as to be inserted into the lower opening of the protection tube 21 of the electrode 20, and a small hole is formed in the upper side wall of the protection tube 21. I wear 22. Reference numeral 23 denotes a support for the electrode 20 and the protective tube 21, into which the lead wire of the electrode 2o is inserted, the upper part of the support 23 is attached to a suitable fixing body, and the electrode 20 is placed in an appropriate position in the sample liquid. Support in places.

As mentioned above, a certain amount of the chemical liquid is collected in the measuring tank 1, diluted with fresh water, and then gas is pressurized into the aspirator pipe 17 and the mixture of the diluted chemical liquid and gas is supplied to the nozzle 19 via the air delivery pipe 7. The amount of gas flowing out from the nozzle 19 is larger than the amount of gas flowing out from the small hole 22 bored in the upper side wall of the protection tube 21.
If the amount of gas injected is increased, the protection tube 21
The surface of the test liquid inside the protective tube 21 is pushed down to the lower end surface of the protection tube 21, the contact between the electric fence 2o and the test liquid is cut off, and the t-pole 20 is cleaned by the diluted chemical solution sprayed from the nozzle 19. . When the diluted chemical solution in the measuring tank 1 is finished being delivered, only gas is injected from the nozzle 19 to maintain a state where the contact between the electric fence 2Q and the test solution is cut off, so open the electromagnetic on-off valve 1o and let fresh water flow in. When flowing into the gas-liquid delivery pipe 7 through the pipe 9, the check valve 13, and the σ connecting pipe 12, clean water is jetted together with the gas from the nozzle 19, and the chemical solution remaining on the nozzle 19 and the electrode 20 is removed. . After removing the chemical solution, close the electromagnetic on-off valve 10 to stop the injection of clean water, stop the operation of the air pump 4, and switch the three-way solenoid valve 3 to stop the injection of gas, so that the test liquid is protected. It flows into the tube 21 and comes into contact with the electrode 20, and, for example, pH measurement is restarted. On the cleaning device side, the chemical solution is collected into the total 11 and diluted with fresh water in preparation for the next cleaning. Therefore, in the next cleaning after an appropriately set time has elapsed, automatic cleaning of the electrodes can be immediately started by pressurizing gas into the aspirator tube 17.

In the explanation of FIG. 1, the series of operations is defined as collecting and diluting the chemical solution in the measuring tank, pressurizing gas into the aspirator tube, and finishing sending out the diluted chemical solution in the measuring tank. When used for cleaning, first clean the electrode by pressurizing gas into the aspirator tube and spraying the gas and the diluted chemical solution in the measuring tank that was sampled and diluted at the end of the previous cycle, then spraying fresh water together with the gas and spraying fresh water. The test liquid flows into the electrode protection tube and measurement is restarted, while a program signal is sent so that a series of cleaning operations is performed, including collecting and diluting the chemical solution in the measuring tank and preparing it for the next cleaning. By configuring the program and repeatedly sending out this program signal at appropriately set time intervals, electrode cleaning can be performed repeatedly.

When the device of the present invention is used for electrode cleaning, there is no need to pull up the fine electrode from the test liquid during cleaning, and effective cleaning is possible by cutting off contact between the electrode and the test liquid, and there is no need to take a break after cleaning. During the measurement period, the chemical solution is automatically measured and sampled and diluted to prepare for the next cleaning, and cleaning can be started at the same time as the cleaning time arrives. This reduces the interruption time of measurement due to cleaning, and also Since the diluent a required for the next cleaning is automatically prepared during the pause period of cleaning, there is no need to store a large amount of the diluent, unlike conventional devices that require manual preparation of large amounts of diluted chemicals in advance. The entire device can be constructed in a simple and compact manner, and maintenance is extremely easy since it eliminates the trouble of diluting the tank and transporting and replenishing a large amount of diluted chemical solution to the storage tank. The injection of clean water for removing the chemical solution remaining in the water also has the advantage that there is no need to add a special injection device.

In addition, instead of spraying clean water together with gas after cleaning the chemical solution as described above to remove the residual chemical solution, stopping the injection of clean water and gas, and then collecting and diluting the chemical solution, it is possible to spray clean water after cleaning the electrode with the chemical solution. The chemical solution for the next cleaning is collected and diluted by omitting the process of injecting it with gas, and during this dilution, the chemical solution remaining on the inner wall surface of the nozzle 19 and the surface of the electrode 20 is removed by the fresh water flowing out from the /through 19. You may also do so.

As shown in FIG. 3, excluding the aspirator pipe, a droplet 2' of the float valve 5 is provided at the inner end opening of the gas injection pipe 2, and the inner end of the gas-liquid delivery pipe 7 is connected to the inside of the measuring tank I. If the gas-liquid delivery pipe 7 is constructed so as to be as close as possible to the bottom wall, it is impossible to allow the mixture of diluted chemical solution and gas to flow out, but for example, it is impossible to allow the mixture of diluted chemical solution and gas to flow out. When calibrating by pulling, it is suitable for cleaning the electrode prior to calibration. Note that the other symbols in FIG. 3 are the same as in FIG. 1.

When performing electrode cleaning as described above using the apparatus of this embodiment, the inside of the measuring tank 1 is opened to the atmosphere via the three-way solenoid valve 3 and the gas injection pipe 2, and the solenoid on-off valve 16 is opened. After collecting a certain amount of chemical solution into the measuring tank i, the electromagnetic on-off valve 16
is closed, and the electromagnetic on-off valve 10 is opened to allow fresh water to flow into the measuring tank i, thereby diluting the medicinal solution collected in the measuring tank 1. The liquid level of the diluted chemical solution in the measuring tank 1 rises and the float valve 5
When the operator closes the fitting part 6 of the gas injection pipe 2, the inflow of fresh water is automatically stopped. Close the electromagnetic on-off valve 10, switch the three-way electromagnetic valve 3, connect the outer end of the gas injection pipe 2 to the gas pump 4, and operate the gas pump 4 to pressurize gas into the measuring tank 1. When the diluted chemical solution is
flows out from the outer end and cleans the electrode surface. After the diluted chemical solution in the measuring tank i has left over 1 chemical solution, the electromagnetic on-off valve 1
0 is closed, the operation of the gas pump 4 is stopped, and the three-way solenoid valve 3 is switched to open the outer end of the gas injection pipe 2 to the atmosphere.

After spraying the diluted chemical solution or the mixture of clean water and gas, the chemical solution is collected and diluted in the measuring tank in preparation for the next cleaning, and the remaining chemical solution on the electrode surface is removed by the clean water sprayed from the nozzle to the dilution source. Of course, it may be removed.

In any of the above embodiments, the reverse valve 13 is interposed in the middle of the connecting pipe 12 so that a mixture of gas and diluted chemical liquid, gas or diluted chemical liquid, etc. Although it is formed so as to prevent the circulation fM iY8, which is a part of the fresh water inflow pipe 9, from circulating, even if the outflow fluid -glB circulates through this circulation path, it will eventually flow through the gas-liquid delivery pipe 7. The check valve 13 may be omitted since the soil will be loosely removed from the outer end.

Further, in any of the above embodiments, it is of course possible to configure instrumentation air to be pressurized into the gas injection tube 2 instead of using a gas pump to pressurize the gas into the gas injection tube 2.

[Brief explanation of drawings]

1 and 3 are diagrams showing one embodiment of the present invention, and FIG.
The figure shows the main parts of an example of the use of the device of the present invention, where 1: Measuring tank, 2: Gas injection pipe, 2': Protrusion, 3: Three-way solenoid valve, 4
: Gas pump, 5: Float valve, 6: Current part, 7
: Gas-liquid delivery pipe, 8.11 and 13; Check valve, 9: Fresh water inflow pipe, 10 and 16: Electromagnetic shut-off valve, +2: aAiji pipe, +4: 4JJ storage, 15: Medicine'ra etc. pipe, 17 :
Aspirator tube, 18: Communication hole, 19; Nozzle, 2o:
Electrode to be cleaned, 21: protection cylinder, 22: small hole, 23: support.

Claims (2)

[Claims] (1) A closed measuring tank with an aspirator tube inside the bottom, a gas injection tube whose inner end is connected to one end of the aspirator tube, and an outer end of this gas injection tube that is open to the atmosphere or switched to a compressed gas source. a three-way solenoid valve to be connected; a float valve that is internally recessed in the gas press-in pipe portion in the closed metering tank and shuts off fluid from the inner end to the outer end; and the inner end is connected to the other end of the aspirator pipe. A connected gas-liquid delivery pipe, a first check valve attached to this gas-liquid delivery pipe, one end connected to a fresh water supply source, and the other end connected to a first electromagnetic on-off valve and a second check valve. the gas-liquid delivery pipe section between the first check valve and the inner end; 1st
A connecting pipe connecting the fresh water and the rabbit inlet pipe between the electromagnetic on-off valve and the second check valve, the upper end of which was connected to the bottom of the closed chemical solution storage tank, and the lower end inserted into the closed measuring tank. A chemical liquid conduit, a second electromagnetic on-off valve that opens and closes the chemical liquid conduit, and a control circuit that controls the operation of the three-way electromagnetic valve, the first and second electromagnetic on-off valves, etc. Liquid mixing pump device. (2) A gas injection tube with its inner end sealed and inserted into the paddle, a three-way solenoid valve that opens the outer end of this gas injection tube to the atmosphere or connects it to a compressed gas source, and the inside of the sealed measuring tank. a float valve that is installed in the gas injection pipe portion and shuts off fluid flowing from the inner end to the outer end; a gas-liquid delivery pipe whose inner end is inserted into the closed measuring tank; One end of the first check valve is connected to a fresh water supply source, and the other end is connected to the first electromagnetic opening/closing valve and the second check valve.
a fresh water inflow pipe branch-connected to the gas-liquid delivery pipe portion between the first check valve and the inner end, and the gas-liquid delivery pipe portion and the first electromagnetic opening/closing between the first check valve and the outer end. a connecting pipe that connects the valve and the fresh water inflow pipe portion between the second check valve; a liquid chemical conduit whose upper end is connected to the bottom of the closed chemical liquid storage tank and whose lower end is inserted into the closed measuring tank; A gas-liquid mixing pump comprising a second electromagnetic on-off valve that opens the chemical liquid conduit, and a control circuit that controls the operation of the three-way electromagnetic valve, the first and second electromagnetic on-off valves, etc. Device.