JPS6017212Y2 - Contaminant removal equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a screen device for removing impurities floating in water, and particularly to a screen device for eliminating clogging of the screen.

Conventionally, in order to remove floating contaminants from water using a screen device, source ice containing floating contaminants is passed through the screen, the suspended contaminants are retained on the screen, and the treated water from which the suspended contaminants have been removed is passed through the screen. The waste is collected downstream.

As the mesh size of the screen becomes smaller, the effect of removing floating impurities increases rapidly, and the removed floating impurities accumulate on the screen surface as sieve residue and increase water flow resistance.

Fixed screens have the disadvantage that the sieve residue increases with water flow time, so if the surface of the screen in the water is scraped with a rake, the sieve residue caught on the screen will be crushed and mixed into the treated water, reducing the quality of the treated water. there were.

In contrast to the above-mentioned fixed screens, there are circulating screens such as net conveyor type screens, wire mesh drum type screens, desk drum type screens, etc., and by moving the screen surface, the amount of sieve residue piled on the screen can be reduced. When a certain limit was exceeded, the screen surface was replaced.

However, in the net conveyor type and the wire mesh drum type, the constituent members of the screen surface intersect, making it difficult to remove sieve residue during operation.

Desk drum type screens are made of multiple disks of the same diameter and are fixed to a rotating shaft and installed in the processing tank, so compared to other screens, the construction is complicated, multiple materials are consumed, and the rotation of the equipment is slow. There were drawbacks such as the weight of the parts and the need for supporting and driving equipment to be large and strong.

The purpose of this invention is to provide a lightweight screen that eliminates the above-mentioned drawbacks, suppresses increase in flow resistance, and allows easy removal of sieve residue.

The configuration of this invention will be explained based on the drawings of the embodiment.

FIG. 1 is a front development view of the embodiment of the present invention, FIG. 2 is a view taken along arrow A-A in FIG. 1, and FIG. 3 is a diagram showing the meshing of the pulley and the screen.

In the figure, an inner tank 2 is provided in an outer box 1, a head pulley 3 is provided close to one end of the inner tank 2, and a tail pulley 4 is provided below the inner tank 2 in the outer box 1.

A plurality of trapezoidal grooves are formed in the outer box of the head pulley 3 and tail pulley 4, and an endless belt-shaped screen member having a trapezoidal cross section is hung in parallel so as to fit into each groove in a wedge shape. do.

A scraper 6 is provided above the vertical surface of the head pulley 3 facing the outer box 1, and is brought into pressure contact with the head pulley 3 and the screen member 5.

A source water flow pipe 7 is provided above the inner tank 2, and a treated water discharge pipe 8 is provided at the bottom of the outer box 1.

At the end of the outer box 1 on the side of the scraper 6, a sieve residue discharging port 9 is opened at the bottom, and a motor 10 interlocking with the head pulley 3 is provided above.

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

When the prime mover 10 is driven, the screen member 5 rotates as the head booby IJ 3 and tail pulley 4 rotate.

Floating contaminants in the wet water flowing into the inner tank 2 from the source water flow pipe 7 are retained as sieve residue on the rotating screen member 5.

The screen member 5 having a trapezoidal cross section has a lock 1. When there is no sieve residue, the bottoms of the trapezoids are placed parallel to each other to keep the gap between the screen members 5 to a minimum.

If more sieve residue is caught, the water flow resistance increases and the water flow rate tends to decrease, but the screen member 5 bends and the opposing trapezoidal bottoms are offset, widening the gap between the screen members 5 and reducing the water flow rate. automatically adjusts so that it returns to its original state.

The locked sieve residue is sent out by a rotating screen member 5, and the sent-out sieve residue is scraped off by a scraper 6 and discharged from a discharge port 9.

After the treated water passes through the screen member 5, it flows down to the bottom of the outer box 1 and is recovered through the treated water discharge pipe 8.

Note that if a cleaning pipe 11 is provided in the outer box 1 on the lower side of the inner tank 2 and the screen member 5 is rotated with dirt attached to it, when the screen member 5 enters the groove of the head boob IJ 3, the dirt will be removed. immerse yourself at the same time.

(2) Debris that is immersed in the groove and does not come out is gradually compacted and reduced by the immersion force of the screen member 5.

Since it does not solidify uniformly in all grooves, screen member 5
The entire row of screen members 5 has an uneven shape at the portion where the screen member 5 contacts the head pulley.

For this reason, the scraper 6 comes into contact only with the surface of the convex portion, and the dust removal rate by the scraper 6 decreases.

Therefore, if the dust adhering to the screen member is removed by the cleaning pipe 11 provided in the lower outer box of the inner tank 2, the grooves will not be clogged and the removal rate by the scraper 6 will be increased.

As explained above, by rotatably providing a plurality of screen members 5 each having a wedge-shaped cross section, and by press-contacting the scraper to the rotary pulley, an increase in flow resistance can be suppressed, the screen can be made lightweight, and the sieve residue can be It could be made into a screen device to facilitate removal.

[Brief explanation of the drawing]

FIG. 1 is a front development view of the embodiment of the present invention, FIG. 2 is a view taken along arrow A-A in FIG. 1, and FIG. 3 shows the engagement between the head pulley and the screen member. 2: Inner tank, 3, 4: Pulley, 5 Varnish cleaning member, 6:
scraper.

Claims (1)

[Scope of utility model registration request] In a device that purifies raw water with suspended impurities by installing a screen in the tank, an inner tank is installed inside the outer box into which the raw water flows, and a plurality of screen members with trapezoidal cross sections are rotated in this inner tank. What is claimed is: 1. A contaminant removal device comprising: pulleys arranged freely in parallel and having a plurality of trapezoidal grooves at one end of the inner tank, on which the screen member is suspended, and a scraper pressed against the outer periphery of the pulley.