CN106770489B

CN106770489B - Filter material swelling degree measuring system

Info

Publication number: CN106770489B
Application number: CN201611238146.5A
Authority: CN
Inventors: 胡锋平; 陈鹏; 何希桢; 戴红玲; 胡文杰
Original assignee: East China Jiaotong University
Current assignee: East China Jiaotong University
Priority date: 2016-12-28
Filing date: 2016-12-28
Publication date: 2020-05-01
Anticipated expiration: 2036-12-28
Also published as: CN106770489A

Abstract

The invention discloses a filter material swelling degree measuring system, which is provided with: a sand setting plate; the lower end of the sand setting plate with the filter screen is provided with a pore plate, and the upper end of the sand setting plate is provided with a gland bush; the probe is formed by connecting at least one sand setting disc in series through a fixing bolt; the probe is fixed at one end of the hollow plastic conduit; one end of the lead symmetrically extends out from the side wall of the sand setting plate, the other end of the lead penetrates through the plastic conduit, and the other end of the lead extends out and is connected with the ohmmeter. The invention has simple structure, is convenient to carry and assemble, and the lengths of the guide pipe and the lead can be adjusted according to the depth of the filter chamber (filter column) to be measured. The device for measuring the expansion degree of the filter material can also be used for measuring interfaces of liquid, sludge and the like in the industries of environmental protection, petroleum, chemical engineering and the like under proper conditions.

Description

Filter material swelling degree measuring system

Technical Field

The invention belongs to the technical field of environmental protection, and particularly relates to a filter material swelling degree measuring system.

Background

When the filter tank (filter column) in water works and sewage treatment plants is back flushed with water, the degree of swelling of the filter material sand needs to be measured. The conventional method comprises the following steps: a steel pipe is adopted, a plurality of small spoons for taking sand are welded at different positions of the lower end of the steel pipe, and the expansion degree of the filter material is determined according to the sand containing condition in the sand spoons. The method has the advantages that the tool is complex to manufacture and cannot be adjusted according to the measured target, the swelling degree is judged only according to the sand content in the small spoon, the method is greatly influenced by factors such as the volume of the small spoon, the flow velocity in the filter column, operation errors and the like, and accurate real-time data cannot be obtained due to time lag. Therefore, it is necessary to develop an economical and practical filter material expansion degree measuring device and method which are relatively optimized, high in accuracy and convenient to operate.

In conclusion, the conventional method for measuring the expansion degree of the filter material sand has the problems of inconvenient operation, low accuracy, overhigh cost for purchasing professional equipment and the like.

Disclosure of Invention

The invention aims to provide a filter material swelling degree measuring system, and aims to solve the problems of inconvenience in operation, low accuracy and the like of the conventional method for measuring the swelling degree of filter material sand.

The invention is realized in this way, a filter material swelling degree measuring system, which is provided with:

a sand setting plate;

the lower end of the sand setting plate with the filter screen is provided with a pore plate, and the upper end of the sand setting plate is provided with a gland bush;

at least one sand setting disc is connected in series through a fixing bolt to form a probe; the probe is fixed at one end of the hollow plastic conduit;

one end of the lead symmetrically extends out from the side wall of the sand setting plate, the other end of the lead penetrates through the plastic conduit, and the other end of the lead extends out and is connected with the ohmmeter.

Furthermore, a plurality of sand setting discs are connected in series through fixing bolts to form the probe.

Furthermore, the sand setting plate with the filter screen, the pore plate and the gland are all made of PVC plates.

Further, the diameter of the sand setting plate and the gland is 70mm, and the thickness of the sand setting plate and the gland is 8 mm; the diameter of the pore plate is 70mm, the thickness is 3mm, and phi 3mm small holes are uniformly drilled on the pore plate.

The filter material swelling degree measuring system provided by the invention can judge the swelling height of mud and sand through the change condition of the resistivity in water and sand, and solves the problems of poor accuracy and inconvenient operation in the past measurement of the swelling degree of the filter material. The invention consists of a sand setting disc; filtering with a screen; an orifice plate; a gland; fixing the bolt; a wire (electrode); a plastic conduit; ohm-sheet composition. The invention has cheap and easily obtained materials, simple structure and convenient carrying and assembly, and the lengths of the guide pipe and the lead can be adjusted according to the filter tank (filter column) to be tested; the expansion height of the mud and the sand is judged according to the change conditions of the resistivity of the water and the sand at the two ends of the electrode, the resistance of the water and the sand is obviously changed, and the ohmmeter has certain measurement precision, so that the expansion degree of the filter material can be accurately reflected.

The method is different from the traditional measuring method which judges the expansion degree by sampling the steel pipe with the sand spoon reversely, and the real-time data can be obtained only by placing the probe in the measured fluid. The invention can also be matched with a real-time control system, such as a typical uniform particle filter material filter control system, and one or more sets of PLC (programmable Logic controller) programmable controllers are used for completing the data acquisition, operation and backwashing process control of the whole filter. According to the difference of the fluid resistances at the two ends of the probe electrode, the invention can feed back the expansion degree to the PLC in the form of an electric signal, thereby controlling the start and stop of the back washing valve.

Based on the principle that the contents of impurities in the fluid are different and the resistances of two ends of the corresponding electrodes are different, the invention can also be used for the industries of environmental protection, petroleum, chemical engineering and the like, measures the interfaces of liquid, sludge and the like, and has simple structure and convenient carrying and assembly. The length of the guide pipe and the guide wire can be adjusted according to the depth of the filter chamber (filter column) to be measured. The device for measuring the expansion degree of the filter material can also be used for measuring interfaces of liquid, sludge and the like in the industries of environmental protection, petroleum, chemical engineering and the like under proper conditions.

Drawings

FIG. 1 is a schematic structural diagram of a filter material swelling degree measuring system provided by an embodiment of the invention;

FIG. 2 is a schematic diagram of an installation of a filter material expansion degree measuring system provided by an embodiment of the invention;

in the figure: 1. a sand setting plate; 2. filtering with a screen; 3. an orifice plate; 4. a gland; 5. fixing the bolt; 6. a wire; 7. a plastic conduit; 8. an ohm meter; 9. a filter material swelling degree measuring device; 10. a liquid level; 11. filtering layer sand; 12. and (4) a filter.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.

As shown in fig. 1, a filter material expansion degree measurement system provided by an embodiment of the present invention includes: the device comprises a sand setting disc 1, a filter screen 2, a pore plate 3, a gland 4, a fixing bolt 5, a lead 6 and a plastic conduit 7.

The lower end of a sand setting plate 1 with a filter screen 2 is provided with a pore plate 3, the upper end is provided with a gland 4, and the three sand setting plates 1 are connected in series through a fixing bolt 5 to form a probe part; the probe is fixed to one end of a hollow plastic catheter 7. One end of a lead 6 (electrode) symmetrically extends out from the side wall of the sand setting plate 1, the other end of the lead penetrates through the plastic conduit 7, and the other end of the plastic conduit 7 extends out to be connected with an ohmmeter 8.

When the probe part contacts with the sand-water interface of the backwashing filter material, the electric signal is fed back to the ohm meter 8 by the lead 6 (electrode). The swelling degree of the filter material can be judged through the change of the resistivity in water and sand. When the sand setting plate 1 is taken out, the discrimination basis can be provided according to the residual quantity of the filter material intercepted by the filter screen 2. (experiments show that the higher the concentration of the filter material is, the smaller the resistance is in the back washing process of the filter column using gravel as the filter material)

The sand setting plate 1 with the filter screen 2, the pore plate 3 and the gland are all made of PVC plates. The diameter of the sand setting plate 1 and the gland 4 is 70mm, and the thickness is 8 mm; the diameter of the pore plate is 70mm, the thickness is 3mm, and phi 3mm small holes are uniformly drilled on the pore plate.

The invention comprises the following steps: the sand setting disc, the filter screen, the pore plate, the gland and the lead (electrode) are used as a main body part (probe) for measurement, and when the device extends into a boundary surface of filter material sand and water, backwashing water containing the filter material enters the probe part of the device. The device electrode feeds back the electric signal to an ohmmeter connected with the outside, and the ohmmeter displays the resistance of the fluid between the electrodes. The resistance reading of the corresponding ohmmeter is changed according to the sand content in the fluid contacted by the lead (electrode). Therefore, the swelling degree of the mud and the sand can be judged according to the change of the resistivity in the water and the sand. When the device is taken out, the filter material is intercepted by the filter screen, and the expansion condition of the filter material at the interface between water and filter layer sand can be visually reflected through the content of the filter material in the sand setting disc.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. a filter material expansion degree measurement system, is characterized in that, described filter material expansion degree measurement system is provided with:

grit chamber;

The lower end of the grit chamber with the filter screen is equipped with an orifice plate, and the upper end is equipped with a gland;

At least one grit chamber is connected in series to form a probe through fixing bolts; the probe is fixed at one end of the hollow plastic conduit;

One end of the wire protrudes symmetrically from the side wall of the grit chamber, the other end runs through the plastic conduit, and the other end of the plastic conduit extends to connect with the ohmmeter;

Multiple grit chambers are connected in series to form a probe through fixing bolts;

The grit chamber with filter screen, orifice plate and gland are all made of PVC sheet;

The diameter of the grit chamber and the gland is 70mm and the thickness is 8mm; the diameter of the orifice plate is 70mm and the thickness is 3mm, and small holes of Φ3mm are evenly drilled on it;

The filter material expansion degree measurement system can judge the expansion height of mud and sand through the change of resistivity in water and sand, which solves the problems of poor accuracy and inconvenient operation in the past measurement of filter material expansion degree;

The probe is placed in the fluid to be measured to obtain real-time data.