JPH0225455Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a rotary filter layer surface cleaning device for removing muddy substances accumulated on the filter layer before backwashing the filter layer. It is.

(Prior art) There are two types of filter bed surface cleaning devices of this type: a fixed type with a fixed pipe that sprays cleaning water, and a rotary type with a rotating cleaning water spray pipe, but they have many advantages. The rotary type is generally widely used. By the way, as shown in FIG. 10, a conventional rotary cleaning device includes a horizontal rotary tube 2 rotatably supported by a vertical fixed tube 1 approximately in the center, and a plurality of horizontal rotary tubes provided at appropriate positions on the rotary tube 2. Pressure from the injection nozzle 2a of 2 to 4 kg/
The structure was such that it was rotated and cleaned by the reaction force of the cleaning water of ^cm2 . For this reason, 5~
The rotational speed of the rotary tube is controlled to 10 rpm by throttling the adjustment valve 23 for the amount of water injected from the injection nozzle to suppress the injection flow rate and lower the injection pressure. However, with this method, the water injection force and amount of water necessary for cleaning the surface of the filter layer cannot be obtained, and the cleaning effect is extremely reduced. Conversely, if the regulating valve is opened to increase the amount of water sprayed in order to improve the cleaning effect, the reaction force will increase and the rotating speed of the rotating tube will increase, unnecessarily disturbing the area near the surface of the filter layer beneath the water surface. This causes the filter material on the surface of the filter layer to float up and flow out together with the waste water. Particularly, as has recently been the case, when anthracite (anthracite), which has a lighter specific gravity than sand, is used as the surface filter medium, the outflow of the filter medium is noticeable.

(Problems to be solved by the invention) This invention was made in view of the above points, and by controlling the rotational speed of the rotary tube using frictional force, the pressure of the conventional cleaning device or higher pressure can be improved. The purpose is to secure water injection in the rotary tube to improve the cleaning effect, and to keep the frictional force constant using the spring force to keep the rotational speed of the rotary tube constant.

(Means for solving the problem) A rotary type in which the horizontal rotating tube is rotated approximately at its center by the reaction force of the cleaning water sprayed from a large number of injection nozzles provided at appropriate locations on the horizontal rotating tube. In the filter layer surface cleaning device, a friction member attached to one of a rotating part including the rotating tube and a fixed part that rotatably supports the rotary part is pressed against the other via a spring to control the rotational speed of the rotating tube. The gist of the invention is to control the

(Operation) The friction member is pressed against the relative rotation part by the spring force, and the rotation speed of the rotary tube is controlled and set to a desired rotation speed by the friction force.

(Example) Hereinafter, an example of this invention will be described based on FIGS. 1 to 3.

Reference numeral 1 denotes a vertical fixed tube as a fixed portion, and a central portion of a horizontal rotary tube 2 is rotatably connected to the lower end of the fixed tube 1 via a bearing device 3. 2a
are a large number of injection nozzles provided on the left and right side walls of the rotary tube 2 in opposite directions. And this bearing device 3
A seal ring 4 is interposed between the upper end of the rotating tube 2 and the fixed tube 1, and a seal sleeve 5 is interposed between the lower end of the fixed tube 1 and the rotating tube 2.

Reference numeral 6 denotes a friction member, which is loaded into an insertion hole 7 formed in a series in the seal sleeve 5 and the wall of the rotating tube 2 corresponding thereto, with one end of the friction member 6 facing the wall of the fixed tube 1, and a coiled spring The friction member 6 is pressed against the wall of the fixed tube 1 by screwing with an adjusting bolt 9 via the screw 8. Note that 7a is a screw portion formed in the insertion hole 7, and 10 is a locking nut for the bolt 9.

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

In Fig. 3, A indicates a filter layer, and in order to clean the surface of this filter layer A, cleaning water is supplied into the rotating tube 2 through the fixed tube 1 and sprayed from the injection nozzle 2a. While the rotary tube 2 rotates under the water surface B due to the reaction force of the sprayed water, the cleaning water is sprayed almost evenly onto the surface of the filter layer A, thereby cleaning the surface of the filter layer A. At this time,
While maintaining the supply amount of cleaning water so as to obtain a sufficient cleaning effect, the rotation speed of the rotary tube 2 is controlled by adjusting the pressing force of the friction member 6 using the adjusting bolt 9. Set within range.

4 to 6 show other embodiments of the present invention,
Reference numeral 11 denotes a vertical rotating tube that is integrally connected to the center of the horizontal rotating tube 2. Both rotating tubes 2 and 11 form a rotating part, and the upper end of the vertical rotating tube 11 is connected to a bearing device 3.
It is rotatably suspended from the fixed tube 1 via.
Reference numeral 12 designates a pair of semicircular ring frames 12 having friction members 6 attached to their inner peripheral surfaces.
Support piece 13 and ring frame 1 extending downward from
They are integrally joined by bolts 9 and nuts 14 passing through both end pieces 12a of the two. A coiled spring 8 is provided between the end piece 12a and the nut 14 in at least one joint portion of both ring frames 12.
A washer 15 is interposed so that the friction member 6 is always pressed against the rotary tube 11 with a constant pressing force.

7 and 8 show a third embodiment of the present invention, in which the outer periphery of the upper end of the vertical rotating tube 11 is expanded upward, the lower end of the fixed tube 1 is inserted into the rotating tube 11, and A collar body 16 is provided protrudingly around the lower part of the fixed tube 1, and an annular friction member 6 is interposed between the collar body 16 and the upper end of the rotating tube 11. A surface pressure ring 17 having a sliding bearing 17a formed of an inclined opening corresponding to the inclined surface of the upper end enlarged diameter portion of the rotary tube 11 and a collar body 1 are provided.
6 and 6 are tightened by a plurality of bolts 9 passing through both and a nut 14 with a coiled spring 8 interposed therebetween, the rotating tube 11 is rotatably suspended from the fixed tube 1, and the friction member 6 is attached to the rotating tube 11. to press. Note that 18 is an O-ring.

FIG. 9 shows a fourth embodiment of the present invention, in which a collar body 19 protruding from a vertically rotating tube 11 is attached to the lower end of a support member 20 extending downward from a fixed tube 1, and a friction member 6 and its support are attached. The member 20 is pressed and clamped by the friction member 6 attached to the clamping piece 21 corresponding to the clamping piece 21, but the opposite ends of the friction members 6, 6 of the supporting member 20 and the clamping piece 21 are fixed by the stopper 22, and each of the above-mentioned embodiments As in the example, they are tightened with a bolt 9 passing through the intermediate portion of both and a nut 14 with a spring 8 interposed therebetween.

Note that the effects of the second to fourth embodiments are the same as those of the first embodiment.
This is completely the same as the embodiment.

(Effects of the invention) As explained above, since this invention has the above-described configuration, it produces the following effects.

(1) The rotational speed of the rotary tube can be controlled by frictional force without adjusting the amount of washing water sprayed.
A consistently higher cleaning effect than conventional cleaning equipment can be maintained.

(2) Since the pressing force of the friction member against the relative rotating part is generated through the urging force of the spring, there is almost no change (decrease) in the friction force due to wear of the friction member, and the rotation speed of the rotating tube is always kept constant. In addition, the strength of the frictional force can be adjusted by changing the displacement of the spring using bolts and nuts.

(3) The structure is simple, and a conventional rotary cleaning device can be easily changed to the structure of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing the first embodiment of this invention, Fig. 2 is an enlarged sectional view of the same main part, Fig. 3 is a front view of the same, and Fig. 4 is a partial sectional view showing the second embodiment. Figure, 5th
The figure is a cross-sectional view taken along the line - - of FIG. 4, FIG. 6 is an enlarged cross-sectional view of the same main part, FIG. 7 is a partial cross-sectional view showing the third embodiment, FIG. 8 is an enlarged cross-sectional view of the same main part, and FIG. The figure is an enlarged sectional view of the main part showing the fourth embodiment, and FIG. 10 is a front view of a conventional general cleaning device. 1...Vertical fixed tube, 2...Horizontal rotating tube, 2a...
...Injection nozzle, 3...Bearing device, 6...Friction member, 8...Spring, 9...Adjustment bolt, 14...Nut.

Claims (1)

[Claims for Utility Model Registration] (1) Rotation in which the horizontal rotating tube is rotated around its approximate center by the reaction force of the cleaning water sprayed from a number of injection nozzles provided at appropriate locations on the horizontal rotating tube. In the type filter layer surface cleaning device, a friction member attached to one of a rotating part including the rotating tube and a fixed part that rotatably supports the rotating part is pressed against the other via a spring to adjust the rotational speed of the rotating tube. A rotary filter layer surface cleaning device characterized by controlling the following: (2) The rotary filter layer surface cleaning device according to claim 1, wherein the fixed part is a vertical fixed pipe. (3) The rotary filter layer surface cleaning device according to claim 1 or 2, wherein the spring force can be adjusted.