JPS6328651B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed type material cleaning apparatus. This type of closed-type material cleaning and filtration equipment has the advantage that it does not emit bad odors from raw water and can be operated under overload like a pressure-type rapid filtration equipment, but it also has the advantage of being able to handle and clean materials that contain suspended solids. Not only does this require a large amount of washing water, but it also requires backwash pits, backwash pumps, backwash blowers, etc. for washing wastewater treatment (sewage treatment), which is uneconomical both in terms of equipment and costs. be.

On the other hand, there is a system in which an ejector for suctioning material is provided at the bottom of the tank main body, and a cyclone is installed on the top of the tank main body, so that the material is circulated and cleaned through the ejector and the cyclone. Since the material taken out of the tank is simply pumped through the conduit along with the waste water,
The cleaning effect during the circulation is not sufficient, and there is a risk that the material may be returned to the tank body uncleaned, and a large amount of power is required to circulate and pressurize the material. Therefore, in the present invention, a centrifugal separation chamber is provided on the tank body, and a circulation path for material from the bottom of the tank body is connected to the centrifugal separation chamber, thereby making it possible to circulate and clean the material, and also to circulate and pressure feed the material. By using a mixed air jet pump with an air inlet in a protective tube with a diameter larger than the nozzle diameter of the injection nozzle, the cleaning efficiency of the material during circulation is increased and the pumping efficiency is improved. A detailed explanation of the illustrated example is as follows.

Fig. 1 is a schematic diagram of the construction of the filtration device in which the material suction port is located at the deepest part of the tank, where 1 is the main body of the filtration tank, the material suction port 2 is located at the deepest part of the tank, and the material suction port 2 is connected to the upper part. The port 3 is open, and a water collection pipe 4 connected to the takeout pipe 4' is provided at the bottom of the tank, and directly below the connection port 3, the inlet 6 of the raw water inflow pipe 5 faces upward, and this inlet A dispersion umbrella 7 is arranged opposite to the dispersion umbrella 6.

Reference numeral 8 denotes a centrifugal separation chamber, which is connected to the connection port 3 of the overtank main body 1, and has an automatic exhaust valve 9 above.
A material return port 10 and a cleaning drain pipe 11 are provided. The drain port 12 of the washing drain pipe 11 opens downward at the center of the separation chamber, and the material return port 10
is opened in the peripheral wall at a position above the drain port 12 and facing the inner surface line direction.

Reference numeral 13 denotes a cleaning circulation passage pipe, one end of which is connected to the material return port 10, and the other end of which is connected to a jet pump 14 with an air inlet so as to direct the jet flow toward the excess return port. A suction pipe 15 of a jet pump 14 is connected to the material suction port 2 via a stop valve 16. The details of this jet pump 14 are as shown in FIG.
8 is opened, and the protective tube 17 has a configuration in which the suction tube 15 and the discharge tube 19 are connected toward the discharge tube 19 of a continuous member, and the cleaning circulation passage tube 13 is connected to the discharge tube. 19.

Reference numeral 20 is a material which is rough around the water collection pipe 4 and finer at the upper part.

Reference numeral 21 denotes a raw water supply pipe whose one end is connected to the driving pump P, which branches into three directions, one of which is connected to the raw water inflow pipe 5, the second to the water collection pipe 4, and the third to the jet pump 14. Each injection nozzle is connected via a valve.

A condensate pipe 23 is branched from the outlet pipe 4' and connected to the drive pump P.

In the figure, V indicates a valve, CV indicates a check valve, T indicates a raw water tank, and LC indicates a level checker.

FIG. 3 shows a case where the material suction ports 2 are located at two locations, one at the deepest part of the inner bottom of the tank main body and the other at an intermediate height position, and the piping has been changed from the case in FIG. 1. That is, as in the case of FIG. 1, the raw water supply pipe may be branched and one of them may be connected via a valve to the jet pump 14' which is connected to the suction port 2' at the intermediate height. In this embodiment, a separate pipe is connected from the raw water tank via a second driving pump.

Overdriving of the closed type material cleaning device of the present invention configured as described above is achieved by supplying the raw water in the raw water tank to the tank main body through the raw water inflow pipe using the driving pump, and sequentially overconcentrating it under internal pressure. When it becomes necessary to wash the material, open the stop valve at the material suction port and the valve just before the jet pump, and close the valve on the raw water inlet pipe.
At that time, raw water is injected from the jet pump into the cleaning circulation passage and is discharged into the centrifugation chamber. Due to this discharge negative pressure and the material's own weight, the material flows into the cleaning circulation passage and is returned from the centrifugation chamber to the tank main body together with the raw water. The dirt adhering to the material is separated and crushed by friction and fluid force and becomes suspended. In particular, when a jet pump introduces air using the negative pressure generated around the injection part, air corresponding to the jet amount is naturally introduced, eliminating cavitation due to the negative pressure, and thereby reducing the jet flow. The retained energy is effectively used for material suction, pumping, and collision with the material, and the bubbles created by the introduced air act effectively to remove deposits.

The dirt thus separated from the material is discharged along with the material in the tangential direction to the wall of the centrifuge chamber. This discharge creates a vortex in the centrifuge chamber, causing material with a high specific gravity to sink, and floating dirt to gather in the center and return to the raw water tank from the drain port through the cleaning drain pipe under the action of tank internal pressure, where it is precipitated and re-filtered. Target water.

When the internal pressure of the tank increases more than necessary due to air bubbles contained in the raw water and air introduced by the jet pump, the automatic exhaust valve in the centrifugal separator opens to release air.

As described above, since the centrifugal separation chamber is provided in the closed tank body and the material is circulated and washed using a jet pump, cleaning efficiency can be improved due to the synergistic effect of the jet jet and the material and air bubbles. Since the material and dirt are completely separated by centrifugation in a closed chamber, sufficient material cleaning can be achieved even if raw water is used as the cleaning water. For this reason, there is no need for a separate source of washing water for washing the materials, and furthermore, there is no need to use sewage because washing waste water can be returned to the raw water tank, making it extremely economical.
Furthermore, as material cleaning becomes more complete, there is no need for conventional accessory equipment such as backwash pits, backwash pumps, and backwash blowers.

In particular, the present invention uses an air mixture jet pump in which an air inlet is opened in a protective tube with a diameter larger than the nozzle diameter from which the injection nozzle emerges for circulating and pressurizing the material, so the cleaning effect of the material is remarkable. expensive.
In other words, with a jet pump that simply injects driving water, the driving water is interposed between the materials like lubricating oil, and there is little friction or collision between the materials, but the present invention When a mixed air jet pump is used, there are air bubbles between the materials, so friction and collision between the materials are not inhibited at all.
Dirt that has adhered due to the intense interaction between materials is reliably removed during circulation, resulting in an excellent cleaning effect. Furthermore, by mixing a large amount of air bubbles into the circulation passage, the volume of the entire fluid in the passage increases, creating a lifting force similar to that of a bubble pump, which not only facilitates the circulation of the material. , it does not require a large amount of power to circulate the material, saving energy and making the device more compact.

In addition, the raw water is pumped from the top of the tank body onto the wood layer and taken from below the wood, so compared to a system where raw water is sent from below the wood and taken in from above, the raw water flow is much lower. There is no need to apply large pressure to the engine, and combined with the effect of the air-fuel mixture jet pump mentioned above, the required power can be reduced to a small horsepower. Moreover, since the material is not agitated when raw water is supplied, there is no dirt mixed into the intake water, and clean intake water can be obtained.

Furthermore, when a material suction port is provided in the middle of the material tank, only the upper layer of material that is prone to clogging can be cleaned, so water can be collected while cleaning the material.

In some cases, a large number of material suction ports are arranged on the same plane or in multiple stages (see FIG. 5) to achieve more even material cleaning.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional diagram of the device of the present invention, FIG. 2 is a cross-sectional view taken along line A-A, FIG. FIG. 5 is a plan view of an example of multiple arrangement. 1...Material tank main body, 2...Material reverse pulling port, 4...
Water collection pipe, 5... raw water inflow pipe, 8... centrifugation chamber,
11...Cleaning drain pipe, 13...Cleaning circulation passage pipe, 14...Jet pump.

Claims (1)

[Scope of Claims] 1. In a sealed filtration device having a water collecting section under the material layer, a centrifugal separation chamber is connected to the filtration tank main body, and a washing return port in the centrifugal separation chamber and a washing return port in the filtration tank main body are connected to each other. A cleaning circulation passage is connected to the material suction port leading to the material layer, and a jet pump having an air introduction port attached to a protective tube with a diameter larger than the nozzle diameter from which the injection nozzle emerges is connected to the circulation passage. On the other hand, there is provided a closed type material washing and filtering device, characterized in that the centrifugal separation chamber is provided with an exhaust valve, and a raw water inlet configured to prevent material agitation is opened at the upper part of the centrifuge main body. 2. The closed type material cleaning device according to claim 1, wherein a plurality of material suction ports are opened at the bottom and the intermediate portion of the material layer. 3. Claims 1 or 2, in which the raw water inlet portion of the material agitation prevention structure consists of a raw water inlet opening facing upward and a dispersion umbrella facing the raw water inlet.
Closed type material cleaning equipment as described in 2.