JPS63149521A - Liquid level measuring apparatus of solid dissolved liquid receiving tank - Google Patents

Abstract

PURPOSE:To facilitate the cleaning of the principal part, to reduce cleaning frequency and to reduce the effect of the flow of a solid dissolved liquid, by providing a solvent injection port and a liquid jet port to a first chamber of a diaphragm part and providing a pressure transmission liquid injection port to a second chamber thereof. CONSTITUTION:At first, slaked lime and water are introduced into a slaked lime dissolving tank and, at the same time, water is also injected in a first chamber 17 of a diaphragm part 15 from a water injection port 21. At this time, since a piercing hole 13 and the first chamber 17 are small as compared with the dissolving tank 2, the concn. of slaked lime in the first chamber 17 does not become high. Even when a stirrer 14 is subsequently operated and a high concn. slaked lime dissolved solution 5 is ready to penetrate in the first chamber 17, the penetration of said solution is prevented or suppressed by the water stream flowing out from the first chamber 17. Therefore, slaked lime adhered to and solidified on a diaphragm 16 is reduced and, as a result, cleaning frequency may be reduced. Water is injected to the diaphragm part 16 from the water jet orifices 22, 23 of the diaphragm part 15 to allow waste water to flow out from the water injection port 21 to make it possible to easily clean slaked lime adhered to and solidified on the diaphragm 16. Further, in a liquid level measuring apparatus 26, the liquid pressure of the solid dissolved solution 5 is transmitted to a pressure sensor 14 through the oil 20 in a second chamber 18 and pressure variation is relaxed corresponding to the amount of the oil 20.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a device for measuring the liquid level of a solid solution in a solid solution storage tank such as a slaked lime dissolution tank in a sewage treatment plant using a pressure sensor. In particular, the present invention relates to a structure of a liquid level measuring device in which main parts are easy to clean and cleaning is infrequent, and liquid level measurement results are less affected by the flow of a solid solution.

[Prior art and its problems]

FIG. 2 is an explanatory diagram illustrating a conventional liquid level measuring device for a slaked lime dissolving tank in a sewage treatment plant. In the figure, u, 1
3 is a slaked lime injecting device that injects powdered slaked lime into the slaked lime dissolving tank 2vc according to the input signal 1a, and 3 injects water into the dissolving tank 2vc when the signal 3a is input, and inputs the signal 3a. will continue to work)'! i #4! This is a water injection device that continues to pour water into the f4 monk. 4 is vcL as mentioned above
``Did the slaked lime and water introduced into the C dissolving tank 2 be stirred to produce slaked lime dissolved sludge 5? It is configured so that the stirring movement can be continued.The liquid level of the dissolved g5 is detected and a liquid level signal corresponding to the liquid level is output.Filt level measurement @ fat, 7 +x signals 1a, 3a , 4a?
When the control device 7 is activated by means not shown, it first outputs fi@la and 3a. Therefore, when the control device 7 is activated, the water level in the dissolving tank 5 rises, and at this time the value of the liquid level signal 6a changes in accordance with the water level. Then, when the control device 7 detects by the signal 6a that the amount of water in the W4 dissolution tank 2 has reached the amount corresponding to the amount of slaked lime that has not been added to the dissolution tank 2 by the signal 1a, the signal 3a is output. , and outputs a signal 4a. 8 is a bong 7 which operates when the signal 8a is inputted and discharges the slaked lime solution 5 to the outside of the dissolving tank 2, and the control device f7 also outputs the signal 4aY for a predetermined time to ensure that the slaked lime is well dissolved in water. It is also possible to output the rear signal 8a to discharge all of the intoxicating liquid 5 in the dissolving tank 2 to the outside of the dissolving tank 2.
, has been. The dissolved liquid g, 5 discharged outside the dissolving tank 2 is used for flocculating sewage sludge.

Reference numeral 9 denotes a pressure receiving section in which a diaphragm 9a is provided as a pressure receiving element, and 10 indicates a pressure guiding section in which a 4EE medium is accommodated to absorb the pressure applied to the diaphragm 9a.

Reference numeral 11 denotes a conversion unit that converts the pressure received by the diaphragm 9a, which is transmitted through the pressure guiding unit 10, into a liquid level signal FiaK. 12 and fixed by spraying 7 lunges. 1
Reference numeral 3 designates a through hole provided in the side wall of the Kff4 dissolving tank 2, which is connected to the surface of the °C diaphragm 9a through the member 12. 14 is a pressure receiving part 9 and a pressure guiding part 10
The liquid level measuring device @ 6 is a pressure sensor that detects a pressure break in the pressure receiving part 9 and outputs a signal 6aY according to the pressure. The temperature is t1° C. between the through hole 13 and the pressure sensor 14.

In FIG. 2, since the liquid level measuring device 6 is configured as a VC as described above, the signal 6a has a value approximately corresponding to the liquid level of the water or the dissolving liquid 5 in the dissolving tank 2.

In this case, water or hxl? During the period when the solution 1 and 5 are being stirred by the stirrer, the water or the solution 5 flows in the dissolution tank 2, and at this time the diaphragm 9a detects the dynamic pressure of the fluid and the "CI" There may be a large measurement error in the signal 6a.In addition, in FIG. 3a* Output 4a and ``cIf4 solution 5
Since the control device 7 is configured to repeat the operation of generating slaked lime, when the solution 5 is discharged outside the dissolution tank 2, slaked lime is extracted from the solution 5 layered on the diaphragm 9a. The slaked lime from the lever remains on the surface of the diaphragm 9a, and as the electricity is transformed, the amount of solid slaked lime layered on the surface of the diaphragm 9a gradually increases. If there is a layer of slaked lime on the diaphragm 9a, the liquid level measurement will be inaccurate.

In this case, it is necessary to frequently clean the diaphragm 9a. Therefore, the above-mentioned liquid level measuring device 6Vc has the problem that it is often necessary to perform the troublesome work of removing the pressure sensor 14 & mounting from the member 12 and cleaning the diaphragm 9a, and the liquid level measurement result is There is a problem in that it may be affected by the flow of 5.

[Purpose of the invention]

The present invention solves the above-mentioned problems with conventional measuring devices, makes it easy to clean the main parts, and reduces the need for cleaning.
Another object of the present invention is to provide a liquid level measuring device for a solid solution storage tank in which the liquid level measurement result is less affected by the flow of a solid solution such as the solution 5.

[Key points of the invention]

In order to achieve the above object, the present invention provides a through hole provided in the lower part of the wall of the solid solution storage tank and a pressure sensor.

A first chamber and a second chamber are provided through a diaphragm, and a first opening provided in the first chamber is connected to a through hole of the solid solution storage tank, and a second opening provided in the second chamber is connected to a through hole of the solid solution storage tank. A liquid level measuring device for a solid solution storage tank using a diaphragm connected to the pressure receiving part of a pressure sensor and a pressure transmitting liquid filled in the second chamber of the diaphragm! In addition, the first chamber of the diaphragm is provided with a solvent inlet for injecting the solvent constituting the solid solution and a liquid injection port for injecting liquid to clean the diaphragm. The second chamber is provided with a pressure transmission fluid inlet that can reduce t of the pressure transmission fluid by 0. That's right, when using this liquid level measurement value M, use the solvent'! l'Inject the solvent into the first chamber of the diaphragm section from the solvent inlet.''
Make sure that the temperature of the t7S solid solution in contact with the diaphragm does not rise too high, and allow the talc to precipitate on the diaphragm.

Solidification "F filter L" so that the solids in the solid solution are reduced
C. It is designed so that the cleaning process of the diaphragm part can be reduced. Also, the pressure in the second chamber of the diaphragm part is
Amount of runs? By adjusting and subtracting.

K is set so that the influence of the flow of the solid solution in the solid solution storage tank on the liquid level measurement results is reduced.

Also, when the solid solution is discharged from the solid solution storage tank,
The diaphragm can be easily cleaned by jetting liquid from the liquid jet port.

[Embodiments of the invention]

FIG. 1 is an explanatory diagram for explaining the configuration of an embodiment of the present invention. In the figure, 15 is the diaphragm 1fi [therefore, the partition 2''l
The diaphragm part has a VC configuration so that the first chamber 17 and the second chamber 18 are formed on both sides of the diaphragm, and the first chamber 17 and the second chamber 11KG2 are opened at the tlit opening 17a*m2. Part 1
8a is provided. Then'''C, first opening part 17
The umbrella 1 is fluid-tightly attached to the member 12 by a seven-lunge connection, and the second opening 18a is also fluid-tightly attached to the pressure receiving part 9Vc of the pressure sensor 14 by a seven-lunge connection. The diaphragm 16 is made of rubber and has a bellows shape, and the second chamber 1
8 is filled with oil 20 as a pressure transmission fluid through the injection port 19 through the pressure transmission port 19 provided on the mounting 18. Inlet 1
9 introduces the oil 20 into the second chamber 18, and the second chamber! 8VC special size and 198 valves so that 20 pieces of oil can be discharged
This is an injection port with a 21 is a water inlet provided in the H1 chamber 17 so that water can be injected into the first chamber 17; 21a is a valve for opening and closing the water inlet 21; The water injection ports 22a and 23a are valves that open and close the injection ports 22 and 23, respectively. The valve 218 is a valve whose opening/closing is controlled by an input signal 25, and the signal 25 is an output signal from the control section 24. The control section 24 corresponds to the control section 7 shown in FIG. 2, and has the same functions as the control section 7, and is also provided with a function Ii for outputting a signal 25. Reference numeral 26 denotes a position measuring device which includes the mounting member 12, the through hole 13, the pressure sensor 14, the diaphragm portion 15, and the oil 20. ZFia & is the liquid level signal corresponding to signal 6a in FIG.

In FIG. 1, each part operates as described below. That is, the control device 24 first outputs the signals ta, 33, and 25 at the same time. Therefore, the signal t a Vc
The appropriate seasonal slaked lime is put into the dissolving tank 2, and water is injected into the #4 dissolving cypress 2. At this time, since the valve 218 is opened by the signal 25, the water inlet 2 is also connected to the diaphragm 150Pjl chamber.
1) Fill with water. However, the device 26 first performs water flow according to the water level in the first chamber 17, and when the first chamber 17 is filled with water, the R'4 riser 2Vc lowers the water level. Start measuring. When the water level corresponds to the amount of slaked lime thrown into the monk by means of the disassembly water in the disassembly tank 2 and the internal message eta, the control section 24 extinguishes the signal 3a. At the same time when water injection into the dissolution tank 2 is stopped, Vc
Inertial force 4a is output (the operation of push contact 4 is started).

As a result, the dissolution of slaked lime in water progresses. Since the diaphragm part 15 is attached to the lower part of the dissolution tank 2, the pressure contact 4
When it starts working, the first chamber +7 is filled with water. When the control unit 24 also eliminates the signal 3a,
Signal 25af? - Gradually change water inlet 21 to 1st
The water injected into chamber 17 is gradually reduced until it reaches zero. Is it because of this (press contact 4
Due to the operation of
? Even if L"C tries to enter the first chamber 17 through the water flow, the water flow VC flowing from the attl7 to the #4 discharging member 2 is prevented or suppressed. Therefore, the slaked lime concentration in the first chamber 17 is Thus, the rise D due to the operation of the presser 4 is avoided.It should be noted that before the stirrer 4 starts operating, VC continues to flow into the first chamber 17 and water is injected.

Since the holes 13 and the first chamber 17 are formed smaller than the size of the dissolution tank 2, the concentration of slaked lime in the first chamber 17 will not be high in this case as well.

In FIG. 1, the concentration of slaked lime in the first chamber 17 is reduced as described above. Therefore, in this case, the amount of slaked lime deposited on the diaphragm 6 and solidified becomes very small.

(Liquid Level Measuring Device) In the case of 2Fi, the frequency of cleaning the diaphragm 16 should be less than in the case of Figure 2.VCr
x-ro. First: In the measuring device 26, water injection ports 22 and 23 are provided in the diaphragm section 15. The water is injected into the diaphragm 16 from the injection ports 22 and 23 of the construction machine and flows out of the first chamber 17 from the water inlet 21, which is the drainage water.
With 6vc, solidified slaked lime can be easily cleaned. Therefore, in the liquid level measuring device 26, the liquid level measuring device f
Maintenance work can be performed much more easily than in case 5.

In addition, in the liquid level measuring device @26, the liquid pressure of the melting tank 5 is in the second chamber 18.
The working pressure is transmitted to the sensor 14 via the oil 20i. However, due to the flow of the solution 5 caused by the operation of the pushbutton 4, pressure fluctuations are alleviated according to the color of the oil 20.

In this case, the amount of oil 20 can be adjusted via the inlet 19.

By appropriately setting the amount of oil 200, the solid solution solution 5
Liquid level measurement that is less affected by flow? ,? You can do it. Liquid level (1) Inlet +9Y when not using FE position 26
If the oil 20 is discharged to the outside of the second chamber 18 through the diaphragm, deterioration of the diaphragm 16 due to the oil 20 can be prevented.

In the above-described embodiment, the diaphragm portion 15 is provided with a water injection port 22.
23, and the diaphragm 15 is fixed to the dissolving tank 2 via the member 12 for spraying, but in the present invention, the number of water injection ports is one or more than 3 fl Yes
Also, the diaphragm part 15 may be attached to the 114II wall of the surface dissolving tank 2.
It is also a good idea to use a liquid other than water for cleaning in step 6.

〔Effect of the invention〕

As described above, the odor 'C of the present invention includes a through hole provided at the lower side wall of the solid solution storage tank, a pressure sensor, and a partition PA.
A first chamber and a second chamber are provided via the first chamber, and a second chamber is provided in the first chamber. A diaphragm part whose opening is in contact with the through hole of the solid F4 solution storage tank, and whose second opening provided in the second chamber is connected to the pressure receiving end of the pressure sensor.

The second chamber of the diaphragm section is filled with the pressure transmitting liquid to constitute a position measuring device k of the solid solution storage tank, and the first chamber of the diaphragm section is
The chamber VC is provided with a solvent inlet for injecting the second medium constituting the solid solution and a liquid injection port for injecting the liquid and cleaning the temperature diaphragm. A pressure transmission fluid inlet that can be adjusted is provided. Therefore, when using this liquid level measuring device, choose the solvent? Inject the solvent into the first chamber of the diaphragm from the solvent injection port? VC can be used to prevent the solid solution from becoming too high in contact with the diaphragm, thereby reducing the amount of solids in the solid solution that precipitate and solidify on the diaphragm. This has the effect of reducing the frequency of cleaning.Also, in the present invention,
Rebellion of the pressure transmission fluid in the second chamber of the diaphragm? Since fluctuations in the pressure applied to the L-C diaphragm can be moderated as appropriate, the influence of the flow of the solid r4 solution on the liquid level measurement results in the solid solution storage tank can be reduced.Effect D' -Yes. Furthermore, in the present invention, when the solid solution is discharged from the solid solution storage tank, an appropriate liquid is discharged from the liquid injection port. The diaphragm can be cleaned by spraying, so it is easy to clean the diaphragm.
・It has the effect of being extremely easy to perform.

[Brief explanation of the drawing]

FIG. 1 shows a structure 51i of an embodiment of the present invention. FIG. 2 is an explanatory diagram for explaining the configuration of a conventional liquid level measuring device. 2... Slaked lime dissolving tank, 5... Slaked lime dissolving liquid, 6゜26... Liquid level measuring device, 9...
...Pressure receiving part, 13...Through hole,! 4...
...Pressure sensor, 15...Diaphragm part, 16
...Diaphragm, 17...First chamber, 17a.
...First opening, 18...Second chamber% 1
8a...Second opening! 9...Pressure transmission fluid, 21...Water inlet, 22.23...
...Water 1 prize gun.

Claims (1)

[Claims] A through hole provided in a lower side wall of a solid solution storage tank that stores a solid solution, and a pressure sensor that has a pressure receiving section and detects the pressure introduced into the pressure receiving section and outputs a signal according to the pressure. , a first chamber and a second chamber are formed on both sides of the diaphragm, separated by a diaphragm, and a first opening provided in the first chamber is connected to the through hole of the solid solution storage tank. and a diaphragm part in which a second opening provided in the second chamber is connected to the pressure receiving part of the pressure sensor, and a pressure transmitting liquid filled in the second chamber of the diaphragm part, The liquid level in the solid solution storage tank is measured based on the output signal of the sensor, and the first
The chamber is provided with a solvent injection port for injecting a solvent constituting the solid solution and a liquid injection port for spraying a liquid to clean the diaphragm, and the second chamber of the diaphragm section is provided with a solvent injection port for injecting a solvent constituting the solid solution. A liquid level measuring device for a solid solution storage tank, characterized in that it is provided with a pressure transmission liquid inlet that can adjust the amount.