JPH0111284Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a backwashing device for a filter.

The backwashing device of this invention utilizes the flow force of the cleaning fluid that is sent back during backwashing operation to rotate a turbine-shaped impeller, and the rotational force is applied to the brush-like stripping material that is in contact with the filter medium or filter. This invention relates to a backwashing device which gives a rousing action to clogging substances applied to a member and, in conjunction with the flow of a cleaning fluid, promotes the action of separating and removing substances from a filter medium or filter.

Conventionally, there is a backwashing device in a filter that moves a stripping member in contact with the filter medium or filter to strip clogging substances, but the source of motion that causes this stripping member to act is a motor or a motor installed in the filter. This method uses a separate motion source such as an internal combustion engine, and is configured so that the peeling member is operated in conjunction with the backwash action command operation.

This device does not use any motor to operate the stripping member, and therefore does not require an interlocking mechanism, and can start stripping the clogging material at the same time as the cleaning fluid flows in, which is activated by a backwashing operation command. This is how it was done.

Next, an embodiment of this invention will be described with reference to the drawings. Reference numeral 1 indicates a filter, and the middle part of the inside of the sealed casing 2 is filled with a filter medium 3 to a certain desired thickness. A mesh filter 4 is installed above the upper surface, and the casing 2 is placed in the contaminated fluid flow promotion chamber 5 above the filter 4.
A dirty fluid supply pipe 6 penetrating through is open.
Further, the space below the filter medium 3 is a clean fluid storage chamber 7, and a discharge port 9 of a discharge pipe 8 passing through the casing 2 is open therein.

At the center of the clean fluid storage chamber 7, a vertical and rotatable shaft is provided with a bearing that vertically passes through the center of the installation position of the filter medium 3 and the filter 4 and is connected to a part of the casing 2. A turbine-shaped impeller 11 is fixed to the lower part of the supported vertical shaft 10. The impeller 11 is installed at a position on the extension of the pipe axis 8' of the discharge pipe 8 described above, where the impeller 11 can rotate by a turbine action relative to the plurality of blades 12 provided on the impeller 11. That is, as shown in the second figure, a plurality of discharge pipes 8 are installed as necessary so as to be centered at the same position as the center of the impeller 11 in a centrifugal direction. Further, a brush-like peeling member 13 is fixed to the upper part of the vertical shaft 10 at a position where it can come into pressure contact with the entire area of the filter 4 by rotation.

In addition, outside the filter 1, the conventional backwashing device in the contaminated fluid supply pipe 6 and the discharge pipe 8 has the same equipment as the filter configuration, such as the switching valve, piping, and pressure feeding means that allow both to perform reverse transfer flow. A detailed explanation of this point will be omitted.

Next, the operation of this device described above will be explained from a normal filtration means. When the polluted fluid is fed under pressure to the polluted fluid flow promoting chamber 5 in the filter 1 through the polluted fluid supply pipe 6, the air under internal pressure Due to the synergistic action, the flow of the filter 4 and the filter medium 3 in the installation direction is promoted, and the polluted substances are filtered by the filter 4 and the filter medium 3, and the polluted fluid becomes a clean fluid and falls into the clean fluid storage chamber 7. Moreover, it flows through the discharge pipe 8 to a predetermined location.

By performing the above-mentioned filtration work for a certain period of time, the filter 4 and the filter medium 3 accumulate trapped contaminants, causing clogging, and when the cleaning rate reaches a certain standard drop point, backwashing is performed. It is something that performs work.

This backwashing operation is to completely reverse the flow direction for purifying the fluid, to discharge the pollutants that have clogged the filter 4 and the filter medium 3, and to move the pollutants through the flow and collect them at a predetermined position. .

The above is a normal backwashing operation, but the backwashing device of this invention can switch the circuit and force-feed the clean fluid or unfiltered dirty fluid for backwashing from the discharge pipe 8 in the flow direction. is carried out along the pipe axis 8' of the discharge pipe 8, and hits the blades 12 of the impeller 11, and this action is very similar to the action of rotating a turbine. A rotational movement is started by the fluid press-fitted from the pipe 8, and the rotation of the impeller 11 transmits the rotational movement to the stripping member 13 via the vertical shaft 10, and the stripping member 13 rotates in contact with the upper surface of the filter 4. The clogging pollutants that were not removed by the simple backflow action of the backwashing action are stimulated by the contact rotation of the removal member 13, and the filter 4 is clogged by the backflow of the fluid. The contaminated substances are completely separated and flowed out, and are discharged to the outside of the filter 1.

Note that although the above-mentioned object to be filtered is referred to as a pollutant, this is not limited to polluted and unclean substances, but is a general term for unnecessary tangible substances contained in a fluid and substances to be extracted.

As described above, this invention uses the flow pressure of the backflow fluid used for backwashing to counteract the clogging phenomenon of the filter 4 installed in the filter 1 during backwashing work to create a turbine-like effect on the impeller 11 installed inside the filter 1. The rotating motion is transmitted via the vertical shaft 10 to the stripping member 13 in contact with the filter 4 in the clogging direction, thereby creating a stripping action on the clogging material and removing unnecessary clogging material. It can be discharged outside the filter. Since the rotational motion given to the stripping member 13 utilizes the inflow pressure of the backwashing fluid used for backwashing work, the dedicated power for rotating the stripping member 13 must be separately applied from outside the filter 1. Therefore, the motor and prime mover of these rotary power sources and the interlocking mechanisms attached thereto are completely unnecessary. Furthermore, this invention is effective in that the stripping member 13 can be automatically interlocked at the same time as the backwashing operation starts and ends.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the filter, and FIG. 2 is a cross-sectional view of the essential parts of the filter. 1... Filter, 2... Casing, 3... Filter medium, 4...
Filter, 5... Dirty fluid flow promotion chamber, 6... Dirty fluid supply chamber, 7... Clean fluid storage chamber, 8... Discharge pipe, 8'... Pipe axis, 10... Vertical axis, 11... Impeller, 12... Feather, 13...Peeling member.

Claims (1)

[Scope of utility model registration request] A filter medium 3 is placed in the middle part of the sealed casing 2.
A filter 4 of a desired mesh is installed above the filter medium 3, and a polluted fluid supply pipe 6 introduced through the casing 2 is opened into a polluted fluid flow promoting chamber 5 in the upper space of the filter 4. ,Also,
In the filter 1, which is provided with a discharge pipe 8 leading from the clean fluid storage chamber 7 below the filter medium 3 to the outside, a vertical shaft 10 passing through the three layers of filter medium and the filter 4 in the longitudinal direction of the central part of the casing 2 is rotated. A vertical shaft 1 that is freely pivoted and projects into the clean fluid storage chamber 7
An impeller 11 is fixed to the lower end of the exhaust pipe 8, and the impeller 11 performs a turbine action by receiving fluid inflow pressure from the exhaust pipe 8 at the intersection of the extension of the pipe axis 8' of the exhaust pipe 8 and the impeller 11. backwashing in a filter, in which a peeling member 13 is fixed to the vertical shaft 10 protruding into the polluted fluid flow promotion chamber 5 and is capable of rotationally contacting the entire surface of the filter 4; Device.