JPS6232299A - Submergible motor pump with self-cleaning filter - Google Patents

Abstract

PURPOSE:To remove foreign substances automatically by attaching a filter medium to the peripheral wall surface of a hollow cylinder, and mounting a rotor provided with blades so that the blades are close to the internal surface of a cylindrical filter, which are provided with a communicating means leading to a water intake port on the cylinder shaft. CONSTITUTION:The casing 10 of a cylindrical filter B is provided with a slit-like liquid intercommunicating pore 10a and a filter medium 11, and the interior is provided with a rotor 12, which rotates by touching the top wall surface. In addition, on the peripheral part of the rotor 12, blades 14 are implanted such that they are close to the internal surface of the casing 10 of the filter B. Thereby, the self-cleaning of the filter-medium surface is performed automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a submersible pump with a self-cleaning filter that can automatically remove foreign substances in a fluid that tend to deposit on the surface of a filter medium during a filtration operation.

[Prior Art] It is widely used in all industrial fields to transfer the fluid and remove foreign substances mixed in the fluid at the same time by interposing a dust removal filter in the flow path of the fluid being pumped using a pump. It is being done. This type of filter is one in which a filter cloth is wrapped around the outer circumferential surface of a rotating drum.
A frame body with a filter material stretched over it, or a short cylindrical wire mesh filter element with one end sealed and a cartridge-type mounting base joined to the open end have been used.

[Problems to be Solved by the Invention] In the conventional dust removal filter as described above, the smaller the particle size of the foreign matter mixed in the fluid to be filtered, the finer the filter medium is required. If there is a large amount of foreign matter deposited on the surface of the filter medium in a short period of time, the filtration capacity will be significantly reduced. This will require frequent repeated cleaning of the filter, which is a huge waste of time and effort, resulting in a drop in productivity. It was a factor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a submersible pump equipped with a so-called self-cleaning filter, which is equipped with a mechanism for automatically removing foreign substances in a liquid to be filtered that tend to deposit on the surface of a filter medium during filtration work. shall be.

[Means for Solving the Problems 1] In order to achieve the above object, the submersible pump with a self-cleaning filter of the present invention includes a submersible pump, a filter medium is attached to the peripheral wall surface of the hollow cylindrical body, and the submersible pump with a self-cleaning filter is attached to the cylindrical shaft portion. A cylindrical filter is provided with a means for communicating with the suction port of the pump, and the cylindrical filter rotates in contact with the inner circumferential surface of the cylindrical filter, and the attachment that widens towards the inner circumferential surface in the direction of rotation is at an angle. A configuration including a rotating body having a plurality of blades embedded therein and a means for rotating the rotating body was adopted.

[Function and Effects of the Invention 1] The submersible pump according to the present invention having the configuration as described above, when the submersible pump is deposited in the liquid to be filtered and the pump is started and the rotating body is driven, the mesh of the filter medium is opened by the suction force of the pump. The passed filtrate flows into the cylindrical filter. - Due to the angle at which the blade rotates in contact with the inner circumferential surface of the cylindrical filter, the blade rotates in contact with the filtrate that exists in the wedge-shaped gap between the inner circumferential surface of the cylindrical filter and the blade. Since compressive force or centrifugal force is exerted, a portion of the filtrate located in such a gap becomes il! It passes through the mesh of the material and is pushed back into the liquid to be filtered, and at this time, the suction force of the pump causes any foreign matter caught in the mesh to fall out due to the pressure of the liquid being pushed back, and the surface of the filter media is self-purified. .

Therefore, the number of labor- and time-consuming filter cleaning or filter replacement operations that are inevitably associated with liquid filtration operations using conventional filter devices can be significantly reduced.

[Example] The structure of the present invention will be specifically described below based on the example shown in the attached drawings.

FIG. 1 is a side sectional view of a submersible pump as an embodiment of the present invention, and FIG. 2 is a sectional view taken along line (A)-(A) in FIG.
A is a submersible pump, and B is a cylindrical filter. 1 is an impeller of a turbo pump, and 1a is a rotating shaft of the impeller, which has a hollow cylindrical shape and also serves as an inlet of pump A. 2 is a drive motor for pump A; 3 is an output shaft of motor 2, which has a hollow cylindrical shape and forms part of the communication means between the suction port of pump A and the discharge port of filter B; The rotating shaft 1 a is fitted onto the output shaft 3 of the motor 2 .

4 is a pump casing, 4a is a discharge port of pump A, and 5 is a pipe connecting the discharge port 4a and a storage tank for filtered fluid.

Reference numeral 10 denotes a casing of a cylindrical filter, which is a flat cylindrical body having a closed inner space.

Reference numeral 10a denotes vertically long slit-shaped liquid passage holes bored at regular intervals on the peripheral wall surface of the casing 10, and 11 denotes an iSl material stretched over the liquid passage hole 10a, which is covered with a wire mesh or filter cloth having an appropriate number of meshes. It surrounds the casing 10. 12 is a rotating body that rotates in contact with the top wall surface in the casing 10; 12a is a hole for fitting the rotating shaft of the rotating body 12; 14
is a group of blades attached downwardly at regular intervals on the periphery of the rotating body 12, and consists of a vertically long band-shaped plate having an arc shape in the width direction, and like the rotating body 12, it is made of metal, hard synthetic resin, etc. It is made of. 15 is a bolt for installing the blade 14.

In this embodiment, the lower end of the blade 14 is a free end, but another rotating body may be provided on the bottom side of the casing 10 and fixed to this rotating body.

17 is a motor for rotating the rotating body 12, 18 is an output shaft of the motor 17, which has a hollow cylindrical shape, and is connected to a cylindrical filter B.
It forms part of the communication means between the liquid outlet of the submersible pump A and the suction port of the submersible pump A. The output shafts 3 and 18 of the pump motor 2 and the filter motor 17 are coaxially connected, and the inner spaces of both form a communication path between the liquid outlet of the cylindrical filter B and the suction port of the pump A. There is. 16 connects the rotating body 12 to the motor 17
Nuts 19 and 2 for fitting and fixing to the output shaft 18 of
0 is the bolt for mounting each motor 2 and 17, 10
b is an upwardly extending portion of the peripheral wall of the casing 10 for connecting the pump casing 4 and the cylindrical filter B; 22 is a connecting bolt; 23 is a filler that fills the internal void of the extended portion 10b of the casing 10; 24 and 25 are power supply lines to the motors 2 and 17, respectively.

FIG. 3 is a schematic diagram illustrating the usage of the submersible pump according to the present invention, in which 30 is a filter tank filled with a liquid to be filtered 31, 32 is a storage tank for filtered fluid, and 33 and 34 are pump motors 2 and 34, respectively. and an operation control box for the filter motor 17.

Next, the operation of the above embodiment device will be explained.

Install the submersible pump as shown in Fig. 3, and start the drive motor 2 of pump A with the discharge valve attached to the discharge port of pump A, which is omitted in this figure, closed. At the same time, the rotating body 12 of the cylindrical filter B
Start the continuously variable speed drive motor 17 at low speed. If the inside of the casing 10 is not filled with filtrate and the mesh of the filter medium 11 is extremely fine, fill the casing 10 with the filtrate in advance.The ability of the filter medium 11 to remove foreign matter from the liquid to be filtered is , some amount of foreign matter deposition is rather preferable, since the problem is improved by a certain amount of foreign matter being deposited on the mesh of the filter medium 11 and the mesh being narrowed. After starting the device, operate the control device for the motor 17 to gradually increase the number of rotations to direct the rotating body 12 in the direction shown by the arrow (B) in FIG.
A blade 14 is installed on the peripheral edge of the casing 10 of the cylindrical filter so as to be close to the inner circumferential surface of the casing 10 of the cylindrical filter, and with an installation angle that approaches the inner circumferential surface asymptotically. Of the filtrate sucked into the casing 10 by the blade 14 and the casing 10
The filtrate existing in the wedge-shaped gap formed between the filtrate and the inner wall surface of the filtrate is subjected to an acting force that pushes it into the wedge-shaped gap, as shown by the arrow (c), and the liquid pressure increases. , and finally the filter medium 11 as shown by the arrow.
from the mesh to the outside of the casing 10. At this time, the foreign matter that was stuck in the mesh is also pushed out and falls out, so that the filter performs a self-cleaning action. If the rotational speed of the rotating body 12 further increases, the centrifugal force generated on the surface of the blade 140 will be added to the above-mentioned fluid suppressing force, and the self-cleaning force will be further enhanced.

By the way, as mentioned above, it is desirable to allow some amount of foreign matter to settle on the surface of the filter medium 11 to increase the ability to remove foreign matter, but on the other hand, there is also a requirement to improve the efficiency of filtration work.
While checking the amount of foreign matter remaining in the filtered liquid, the rotation speed of the rotating body 12 is adjusted, and at the same time, the opening degree of the discharge valve is also changed to adjust the amount of filtrate sucked into the casing 10 of the cylindrical filter B and the pump. Measure the balance with the discharge amount from A. Once the optimal control conditions for the filtration system have been determined, as long as the same filtration operation is repeated, the operation can be continued under these set conditions.

The liquid to be filtered 31 in the filtration tank 30 gradually accumulates foreign substances that were once tried to be adsorbed on the surface of the filter medium 11 and then fell off as described above, so they are transferred to another temporary storage tank at regular intervals. The foreign matter may then be separated by a sedimentation method, a filtration method, or the like, or the accumulated foreign matter may be removed within the machine by utilizing the time when the filtration tank 30 is not operating. Of course, if the volume of the filtration tank 30 is extremely large, such as a pond or a river, such consideration is not necessary at all.

Next, using a test device having the configuration shown in the above example, we compared the change over time in the filtration capacity (discharge amount) of the device when the rotating body 12 was rotated and when it was not rotated. The results of the above experiment will be explained with reference to Table 1, which is a list of each experimental condition, and Figures 4 to 7, which are graphs of the correlation between pump discharge gloss and operating time obtained for each of these experiments. . In each graph, measured values from experiments conducted five times under the same conditions are plotted, and the distribution area of this plot is expressed as a band-shaped diagonal area as shown in (I) to (G).

In Figure 4, which illustrates the experimental results of N011 in Table 1,
When the rotating body 12 is not rotated, the band graph (
As can be seen in D), the discharge rate continues to decrease immediately after the device is activated, halving after about 4 minutes, and 17 minutes after 8 minutes.
The rotating body 12 was lowered to about 20O.
When rotating at rpm, as shown in graph (A), there was no noticeable drop in the discharge amount even after 10 minutes, clearly demonstrating the outstanding filtration performance of the device of the present invention.

The second and third experiments used paper valves, which are much more likely to clog the filter @ 11 than the iron powder used as the foreign material in the first experiment, so the self-cleaning effect of the rotating body 12 was The effect is clearly seen in Figures 5 and 6, which are graphs for when the rotating body 12 is rotated and when it is not rotated (
The slopes of the downward curves are extremely different between C) and (D), and between (E) and (H).

) The fourth experiment was conducted under the same test conditions as the third experiment, except for the rotation speed of the rotating body 12 and the discharge amount, in order to determine the correlation between the rotation speed and the filtration performance. As shown in Figure 7, which summarizes the test results, the rotating body 1
When the rotation speed of 2 is 800rpc+, there is no noticeable decrease in filtration capacity as seen in graph A even after 10 minutes, and graph B at aoorpm is also compared to graph 8.
There is not much difference, and after 5 minutes after reaching graph D at 1100 rpm, the filtration performance drops to around 80% of the starting level, but after that, it is maintained at almost this level of performance, and when the rotating body is stopped It is shown that there is no comparison with the graph (g). Of course, the optimum rotation speed of the rotating body 12 varies depending on the filtration conditions, but if we take several experimental results into consideration, it is 200 to 400 rpm+.
It is understood that an extremely excellent self-cleaning effect of the filter medium is produced within this range. Of course, if the rotation speed is increased beyond that, it is expected that the performance will improve somewhat.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a submersible pump as an embodiment of the present invention, FIG. 2 is a sectional view taken along line (A)-(A) in FIG. 1, and FIG. 3 is a sectional view of the submersible pump shown in FIG. 1. FIG. 4 is a diagram illustrating an example of a usage situation, and FIGS. 4 to 7 are data graphs comparing the filtration ability of the submersible pump according to the present invention and that of a conventional pump. In the diagram A: Submersible pump B: Cylindrical filter 1
... Pump impeller 2 ... Pump motor 3.
18...Communication means part between pump and filter 10...
・Casing of cylindrical filter 10a...Liquid passage hole 1
1... Filter medium 12... Rotating body 14... Blade
17...Rotating body drive motor

Claims (1)

[Scope of Claims] 1) a submersible pump; a cylindrical filter having a filter medium attached to the peripheral wall surface of a hollow cylindrical body, and a communication means to the suction port of the submersible pump attached to the cylindrical shaft; A rotating body that rotates in contact with the inner circumferential surface of the filter and has a plurality of blades installed therein that have an attachment angle that widens towards the inner circumferential surface in the direction of rotation, and a means for rotating the rotating body. Submersible pump with self-cleaning filter.