JPS6313777Y2 - - Google Patents

Description

[Detailed description of the invention] This invention removes garbage from liquids (undiluted solutions) that require filtration, such as industrial water, industrial wastewater, sewage, seawater, and crude oil.
It is used to remove solid foreign matter such as earth and sand, and has a cylindrical filtration element placed inside a rigid cylindrical filtration tank, and is configured so that the filtrate filtered by the filtration element can be taken out from inside the filtration element. Regarding improvement of strainer.

A strainer of this type developed by the inventor of the present invention is known (Japanese Utility Model Application No. 55-95812). This strainer divides the liquid flow chamber formed between the filtration tank and the filtration element into two with a partition member (some examples use a scraper as a partition member), and the liquid moves in a circular motion in the liquid flow chamber. The structure is such that it can flow into the filtration element during the process. Therefore, according to this conventional example,
Due to the cyclone effect caused by the circular motion of the stock solution, solid foreign matter in the stock solution is centrifuged and the remaining solid foreign matter is also separated by the filter element. In addition, the surface of the filtration element is washed by the circular flow of the undiluted solution, preventing solid foreign matter from sticking to it, making it easier to scrape off the solid foreign matter with a scraper, and maintaining the filtration performance of the filtration element in a somewhat good state. .

However, in the above conventional example, two stock solution flow chambers are used.
Since the dividing member restricts the circular motion of the stock solution within one circumference, it is not possible to expect a strong swirling motion of the stock solution. As a result, there was a problem that the performance was inferior in terms of centrifugal separation of solid foreign matter by the cyclone phenomenon and cleaning of the surface of the filtration element by flowing the stock solution.

It is an object of the present invention to solve the problems of the prior art described above and to provide a strainer with even better performance.

The present invention will be explained in detail below based on embodiments shown in the drawings. Reference numeral 1 denotes a cylindrical, rigid filtration tank, in which a stock solution inflow chamber 3a is provided near the upper end of the side peripheral wall 2, and a filtrate outlet 5a is provided in the center of the bottom plate 4. The stock solution inlet 3a is connected to a stock solution inflow pipe 3 that faces in the tangential direction of the inner circumferential surface of the filtration tank 1, so that the stock solution moves in a spiral motion within the filtration tank. An outflow pipe 5 for taking out the filtrate out of the apparatus is connected to the filtrate outflow port 5a. Further, a foreign matter storage tank 6 is connected to the lower part of the filtration tank 1, and a stock solution flow chamber 9 formed between the filtration tank 1 and the filtration element 8 is connected through a communication hole 7 bored at a predetermined position in the bottom plate 4. It communicates with the foreign matter storage tank 6. Reference numeral 10 denotes a foreign matter discharge pipe provided at the lower end of the foreign matter storage tank 6, which is opened at appropriate times to discharge foreign matter.

The filtration element 8 is formed into a cylindrical shape with a top and bottom, and is rotatably disposed within the filtration tank 1 . The filtration part 11 of the filtration element 8 can be constructed by, for example, wrapping a wedge wire 12 having a triangular cross section into a cylindrical shape, and prevents solid foreign matter from passing through. A gap is formed between adjacent portions of the wedge wire 12, and only the filtrate passes through this gap. It goes without saying that the filter section 11 can also be constructed of a porous tube or the like.

The filtration element 8 has its lower opening edge 13 in contact with the bottom plate 4 in a water-sealing state, and the top plate 14 of the filtration tank 1
It rotates with the rotation of a rotating shaft 15 disposed through the shaft. This rotating shaft 15 is preferably rotated by a motor 16, but may also be rotated manually. The rotation direction of the filter element 8 can be set in the same direction as the flow direction of the stock solution, or may be set in the opposite direction. Furthermore, it is also possible to configure the filtration element 8 to have a fixed structure so that the scraper 18 described later contacts the filtration element 8 and rotates around it.

18 is a scraper that comes into contact with the filter element 8 to separate solid foreign matter. This scraper 18
For example, a Teflon (registered trademark) rod shaped like a knife edge or a similarly shaped brass rod can be used to scrape off solid foreign matter adhering to the filtration part 11 of the filtration element 8. I can do it. Alternatively, a brush-like object may be used as the scraper 18 to scrape off solid foreign matter adhering to the filter section 11. Reference numeral 19 denotes a scraper support member, which is composed of a main column portion 20 made of a relatively thin hard rod, a scraper insertion portion 21, and connecting portions 22, 22 that connect both 20 and 21. can be removably inserted. The main column part 20 has its upper and lower ends fixed to the top plate 14 and the bottom plate 4 by screw means or the like, and is arranged at an appropriate position in the stock solution flow chamber 9. The scraper support member 19 is formed and positioned so as not to seriously impede the swirling motion of the stock solution. In the illustrated example, the main column part 20 and the scraper insertion part 21 of the scraper support member 19 are arranged side by side with a gap between them, so that the stock solution can flow between them, and the scraper support member 19 is The arrangement as shown in Figure 2 is as follows.
We have no choice but to respond to the above request. In the illustrated example, a scraper 18 is disposed near the communication hole 7, so that solid foreign matter scraped off by the scraper 18 is easily guided to the foreign matter storage tank 6 through the communication hole 7. . In addition, 23
is a guide plate erected at the rear of the communication hole 7.

Next, the operation of the present invention will be explained based on the above embodiment. The stock solution a flows into the stock solution flow chamber 9 through the inlet port 3a, where it flows diagonally downward while swirling along the inner peripheral surface of the filtration tank 1. This spiral motion is caused by the scraper 18 and the scraper support member 19.
Although there is a tendency to be somewhat blocked by this, the process is generally smooth, and the stock solution a sequentially flows into the filtration element 8 while circulating in a spiral around the filtration element 8.

Most of the solid foreign matter b in the stock solution is centrifuged by the cyclone phenomenon caused by the overwinding movement of the stock solution, and after descending while swirling around the outer periphery of the stock solution flow chamber 9, the foreign matter is grasped by the guide plate 23. Storage tank 6
sent to.

The solid foreign matter b that is not centrifuged is sent to the filtration element 8 together with the stock solution a;
It is separated by adhering to. Most of the solid foreign matter b adhering to the filter element 8 is scraped off by the scraper 18 and finally led to the foreign matter storage tank 6. Further, some of the solid foreign matter b adhering to the filter element 8 is subjected to a strong cleaning action by the swirling flow of the stock solution, and is separated from the filter element 8 before being separated by the scraper 18.

On the other hand, the stock solution a that has flowed into the filter element 8 is filtered here to become a filtrate c, which is taken out to the outside through the outflow pipe 5.

Since the strainer of the present invention has the above-described structure and function, it can produce the following effects.

In the stock solution flow chamber, the stock solution swirls, and this swirling motion causes a scraper and a scraper support member (mainly composed of a relatively thin vertical rod, minimizing resistance to the swirling motion of the stock solution).
Since the strainer is not blocked by the strainer, a strong cyclone phenomenon occurs in the stock solution compared to the strainer described in Japanese Utility Model Application Publication No. 55-95812.
As a result, the amount of solid foreign matter that reaches the filter element can be reduced, and the amount of solid foreign matter that can be centrifuged can be increased. Therefore, the load on the filtration element is reduced, and filtration efficiency can be increased.

The swirling motion of the undiluted solution is more intense than the circular motion of the undiluted solution in the strainer described in Japanese Utility Model Application No. 55-95812, so the ability to clean the surface of the filtration element is much superior. Therefore, the solid foreign matter adhering to the filter element can be actively peeled off, and the scraping operation with the scraper is facilitated.

As described in and, since the amount of solid foreign matter adhering to the filter element can be reduced, the quality of the filtrate can be improved in proportion to the reduction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing the principle of the present invention, and FIG. 2 is a schematic plan view of FIG. 1. DESCRIPTION OF SYMBOLS 1... Filter tank, 3... Stock solution inflow pipe, 8... Filtration element, 9... Stock solution flow chamber, 18... Scraper, 19... Scraper support member.

Claims (1)

[Scope of utility model registration request] A strainer formed between the filtration tank and the filtration element in a strainer configured such that a cylindrical filtration element is arranged in a rigid cylindrical filtration tank and the filtrate filtered by the filtration element can be taken out from inside the filtration element. A undiluted solution inflow pipe is connected to the upper part of the undiluted solution flow chamber in the tangential direction thereof, so that the undiluted solution moves in a spiral motion, and the filtration element is disposed within the undiluted solution flow chamber and is relatively rotatably in contact with the filtration element to remove solid foreign matter. A strainer characterized in that a scraper for separating liquid is attached to a scraper support member mainly formed of a relatively thin rod so as not to seriously impede the swirling motion of the stock solution.