TWI813439B - Viscoisity-sensing apparatus - Google Patents

Abstract

A viscosity-sensing apparatus includes a ring and sensors. The ring is connected to a pipe of a tank. The sensors are connected to an internal face of the ring at various heights. Sludge travels into the ring from the tank through the pipe. The sensors sense values of viscosity of the sludge at different depths in the ring.

Description

Viscosity sensing device

The present invention relates to a pool sludge discharge pipe control valve, and in particular to a sludge viscosity sensor that helps to accurately control the valve.

Sludge is produced when liquids containing solids settle in a pool. This pool may be a sedimentation tank in a water purification plant or a primary or secondary sedimentation tank in a sewage treatment plant.

A pump can be used to remove sludge from this pool. In this case, the pump must be controlled. If the pump does not pump enough, sludge will remain in the pool, affecting the quality of the water in the pool (which will flow out of the pool and become effluent). If the pump pumps too much, water-laden sludge will be removed from the basin, and it has proven costly to deal with this later in the process.

To solve the above problem, the pump can be controlled by a timer. However, practice has proven that this method is imprecise and unsatisfactory.

The pump can be controlled interactively. When the sludge is thick, that is, contains solids, the pump operates at high power. When removing sludge, operate the pump at lower power. If there are no other changes, in a positive displacement pump, the change in power is represented by the change in torque of the pump's motor. However, measurements of the motor's torque to determine sludge viscosity are susceptible to mechanical problems associated with the motor.

Alternatively, the sludge can be discharged by gravity, i.e. without any pumps. In this case, a valve is used to control the discharge of sludge. If the valve is not opened enough, sludge will remain in the pool and affect the quality of the outgoing water. If the valve is opened too large, a wide sinking cone will be formed around the discharge pipe opening in the pool due to the large drainage flow. Practice has proven that when a subsidence cone occurs, sludge and water will be discharged, thereby increasing the cost of subsequent treatment procedures.

In view of this, the inventor of this case used his many years of experience in related design practices to actively research and improve, and through many physical sample production and testing, he further specifically improved the above-mentioned shortcomings of the conventional technology, and finally completed the present invention.

In order to overcome the above shortcomings, the present invention provides an accurate viscosity sensing device.

The viscosity sensing device of the present invention has a ring and multiple sensors. This ring is connected to a mud discharge pipe from a pool. The sensors are attached to an inner surface of the ring at different heights. Sludge flows from the pool into the ring through the sludge discharge pipe. The sensors sense the viscosity of the sludge at different depths in the ring.

The following is a detailed description with specific examples and accompanying drawings, so that the review committee can have a further understanding of the technical features of the present invention:

As shown in FIGS. 1 and 2 , a pool 10 is equipped with the viscosity sensing device 20 of the first embodiment of the present invention, a sensing signal converter 30 and a controller 32 . Pool 10 may be a sedimentation tank in a water purification plant or a primary or secondary sedimentation tank in a sewage treatment plant. Sludge flows from the pool 10 into the viscosity sensing device 20 . The viscosity sensing device 20 senses the layered viscosity of the sludge therein. The controller 32 receives the layered viscosity from the viscosity sensing device 20 through the converter 30, and reduces or stops discharging sludge from the pool 10 when it is determined that the viscosity has changed.

The pool 10 has a mud discharge pipe 12 and a valve 14. The mud discharge pipe 12 is connected to the lower section of the pool 10 . The mud discharge pipe 12 is used to discharge mud from the pool 10. The valve 14 is provided on the mud discharge pipe 12 . Valve 14 is used to control the discharge of sludge leaving pool 10 via sludge discharge pipe 12 . When the valve 14 is opened, the mud layer at the bottom of the pool 10 flows out of the pool 10 due to the water pressure above. When valve 14 is closed, mud discharge is stopped.

The viscosity sensing device 20 is connected to the mud discharge pipe 12 . Therefore, the sludge leaving the pool 10 through the sludge discharge pipe 12 must pass through the viscosity sensing device 20.

Referring to FIG. 3 , the viscosity sensing device 20 has a ring 22 and a plurality of sensors 24 , and the sensors 24 are arranged on the inner surface of the ring 22 . The converter 30 is provided at the upper end of the ring 22 . Each sensor 24 is connected to the converter 30 via a separate signal line. Each sensor 24 has two electrodes 26 and 28. Each sensor 24 is used to sense or measure a conductivity. In this application, the conductivity becomes larger or smaller with viscosity. Therefore, each conductivity measurement can be converted into a viscosity of the sludge between the electrodes 26 and 28 of the corresponding sensor 24 . If the pool 10 is a sedimentation tank of a water purification plant, each conductivity measurement value can be converted into sludge concentration (concentration) or sludge density (sludge density).

Referring to Figure 4, sensors 24 are at different heights within ring 22. Any two adjacent sensors 24 have approximately the same height difference. The electrodes 26 and 28 of each sensor 24 are arranged along a horizontal line, that is, at the same height. The gap between the electrodes 26 and 28 of each sensor 24 is equal to the gap between the electrodes 26 and 28 of the other sensor 24 . Therefore, in terms of accuracy, these sensors 24 are equal. Therefore, the measured values of different depth sensors 24 are different, which means that the viscosity changes with depth, thereby determining that the sludge becomes thinner. The sensors 24 are arranged in two halves of the inner surface of the ring 22 cut along a vertical line. In terms of height, the sensors 24 in the first half are staggered with the sensors 24 in the second half.

Figure 5 presents a viscosity sensing device according to a second embodiment of the present invention. The second embodiment differs from the first embodiment only in that the sensors 24 are arranged on one of the two halves of the inner surface of the ring 22 .

Figure 6 presents a viscosity sensing device according to a third embodiment of the present invention. The third embodiment differs from the second embodiment only in one thing, namely that the ring 22 is a rectangular ring with two walls. These sensors 24 are arranged on the inside of one of the two walls of the rectangular ring 22 .

However, the above three embodiments can accurately sense the thickness of sludge at different depths. The concentration of sludge at different depths is used to determine whether valve 14 discharges sludge from pool 10. In the following description, the number of sensors 24 is 12 as an example.

If the viscosity measured by the first three sensors 24 counting from top to bottom is significantly smaller than the viscosity measured by the nine sensors 24 below it, that is, one-fourth of the total sensing volume above it. If the viscosity measured by the sensor 24 is significantly less than the viscosity measured by the sensor 24 below three-quarters of the total amount, it can be determined that the valve 14 discharges slightly thin mud from the pool 10, and a warning is provided accordingly, and the valve 14 is operated. Reduce the mud discharge through the mud discharge pipe 12.

If the viscosity measured by the first six sensors 24 from top to bottom is significantly smaller than the viscosity measured by the six sensors 24 below it, that is, one-half of the total number of sensors above it If the viscosity measured by the sensor 24 is significantly less than one-half of the total volume below, it can be determined that the valve 14 is discharging very thin mud from the pool 10, and a warning is provided accordingly, and the valve 14 is operated to close. Mud discharge pipe 12.

It should be noted that the sensing device 20 senses the viscosity periodically, for example every 1 to 3 seconds. Therefore, the sum of the viscosity sensed by all the sensors 24 can also be used as an indicator of the sludge viscosity. If the difference in viscosity measured by each adjacent sensor 24 is small but the total sum is significantly smaller than the previous sum, it is still determined that the mud discharged from the pool 10 by the valve 14 has become thinner, and a warning is provided accordingly, and/or the operation is performed. Valve 14 closes mud discharge pipe 12.

When there is no or very little sludge in the pool 10, the valve 14 is closed, and the measured values of each layer of the viscosity sensing device 20 maintain a stable state (measured values of air or accumulated water). When there is a considerable amount of sludge in the pool 10, the valve 14 is opened, and the viscosity sensing device 20 quickly senses the increase in viscosity and determines the arrival of high-viscosity mud water. After a period of time (10 seconds to 10 minutes), the viscosity measured by the viscosity sensing device 20 becomes smaller and it is determined that the sludge has become extremely thin, and the valve 14 is closed accordingly. How to determine that there is a considerable amount of sludge in the pool 10 will not be discussed in detail here because it is not the essence of the present invention.

From the above detailed description, those who are familiar with this art can understand that the present invention can indeed achieve the aforementioned objectives, and has complied with the provisions of the patent law, and is ready to file an invention patent application.

10:Pool 12: Mud discharge pipe 14: valve 20:Viscosity sensing device 22: Ring 24: Sensor 26, 28: Electrode 30:Converter 32:Controller

Figure 1 is a side view of a pool equipped with a viscosity sensing device according to the first embodiment of the present invention to sense the viscosity of sludge discharged from the pool; Figure 2 is a perspective view of a mud discharge pipe connected to the viscosity sensing device shown in Figure 1; Figure 3 is a schematic diagram of the viscosity sensing device shown in Figure 2; Figure 4 is a front view of the viscosity sensing device shown in Figure 3; Figure 5 is a front view of the viscosity sensing device according to the second embodiment of the present invention; Figure 6 is a front view of the viscosity sensing device according to the third embodiment of the present invention.

20:Viscosity sensing device

22: Ring

24: Sensor

26, 28: Electrode

30:Converter

Claims (13)

A viscosity sensing device, which includes: a ring (22) connected to a mud discharge pipe (12) of a pool (10); and a plurality of sensors (24) attached to the ring (22) At different heights of an inner surface, the viscosity of the sludge discharged from the pool (10) at different depths in the ring (22) is sensed, and the gap between any two adjacent sensors (24) is equal to the other two phases. A gap adjacent the sensor (24), wherein each sensor (24) has two electrodes (26, 28), and the two electrodes (26, 28) of each sensor (24) The distance between them is equal to the distance between two electrodes (26, 28) of another sensor (24). The viscosity sensing device as claimed in claim 1, wherein the two electrodes (26, 28) of each sensor (24) are arranged horizontally at the same height. The viscosity sensing device as claimed in claim 1, wherein the sensor (24) is arranged throughout the inner surface of the ring (22). The viscosity sensing device as claimed in claim 1, wherein the sensor (24) is arranged on the inner surface of half of the ring (22). The viscosity sensing device according to claim 1, wherein the ring (22) is a circular ring. The viscosity sensing device of claim 1, wherein the ring (22) is a square ring, and the sensor (24) is arranged on the inner surface of a vertical side of the ring (22). The viscosity sensing device as claimed in claim 6, wherein the ring (22) is a square ring. The viscosity sensing device according to claim 1, further has a converter (30) disposed at the upper end of the ring (22), and each of the sensors (24) is connected to the converter through a signal line. (30). The viscosity sensing device as described in claim 8 further has a controller (32) connected to the converter (30) via a signal line to read the viscosity sensed by the multi-layer sensor (24), and Accordingly, a mud discharge valve (14) can be accurately closed to avoid discharging thin mud from the pool (10). A method for controlling a pool sludge drain pipe valve, which includes the following steps: providing the viscosity sensing device described in claim 1; sensing the viscosity of sludge at different depths; if the Mth sensor from top to bottom is sensed If the viscosity of the sludge measured by the sensor is significantly smaller than the viscosity of the sludge measured by the M+1th sensor from top to bottom, then it is judged that the valve discharges slightly thin mud from the pool through the mud discharge pipe, where M is a natural number; if the viscosity of the sludge measured by the Nth sensor counting from top to bottom is significantly smaller than the viscosity of the sludge measured by the N+1th sensor counting from top to bottom. , then it is judged that the valve discharges slightly thin mud from the pool through the mud discharge pipe, where N is a natural number, and N is greater than M. The control method of the pool mud drain pipe valve described in claim 10 also has the following steps: after judging that the valve discharges slightly thin mud from the pool through the mud drain pipe, a warning is provided and the valve is allowed to open the drain pipe. Mud pipe. The control method of the pool mud drain pipe valve described in claim 10 also has the following steps: after judging that the valve discharges very thin mud from the pool through the mud drain pipe, provide a warning and operate the valve to close the drain pipe. Mud pipe. The control method of the pool mud drain pipe valve as described in claim 10 includes the following steps: At regular intervals, use the sensors (24) to sense the viscosity once; calculate the sum of the viscosity measured by the sensors (24) each time; if any two adjacent sensors (24) measure the viscosity at a time The difference in viscosity is small but the sum of the viscosity measured once is significantly smaller than the sum of the viscosity measured previously, it is determined that the sludge discharged from the pool (10) has become thinner, and a warning is provided accordingly, and the discharge is closed. Mud pipe(12).

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