JPS6241046B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic backwash strainer that can continuously and automatically remove foreign substances from a polluted liquid, and is particularly effective for purifying waste liquid.

Conventionally, when heat is recovered by passing hot waste liquid through a heat exchanger, there are problems such as foreign matter in the hot waste liquid clogging the heat exchanger, making it impossible to obtain the desired flow rate, or requiring more pump power than necessary. , it was necessary to remove foreign objects in front of the heat exchanger. Various strainers and filters are used for this purpose, but if there is foreign matter such as lint, they may catch the lint between the filter plate and the backwashing device, or prevent the lint from entering the filter material. Furthermore, there were problems such as the inability to remove the filter by backwashing, and the time and effort it took to select the optimal filter material or to replace the filter material when a blockage occurred.

The device of the present invention solves the above-mentioned drawbacks and has a structure that can be manufactured at low cost.The main feature is that a large number of conical holes are provided in the partition plate, and the large diameter side is the filtering surface and the small diameter side is the filtering surface for foreign matter. In other words, by providing a large number of conical holes in the partition plate and directing the large diameter side to the purification liquid section and the small diameter side to the polluted liquid section, the sheet is placed in the purification liquid section. A filter material is stretched to cover the large diameter side of the conical hole, and a backwashing device consisting of a hollow arm is installed in the polluted liquid section so that its inlet hole opens on the small diameter side of the conical hole. It is characterized by being rotatably provided.

Next, embodiments of the present invention will be described based on the accompanying drawings. 1 is a main body, and the polluted liquid flows into the polluted liquid section 1a through an inlet nozzle 2 provided on the main body. Foreign matter in the polluted liquid is separated and captured by the sheet-like filter material 8 and accumulated in a large number of conical holes 13 provided in the partition plate 6. The purified liquid passes through the filter material and enters the purified liquid section 5a in the upper lid 5 of the main body and flows out from the outlet nozzle 3. 7 is a wire mesh reinforcing the filter material, and 9 is a holding frame. The foreign matter accumulated in the conical hole 13 is discharged from the impurity discharge nozzle 10 to the outside through the inlet hole 14a of the hollow arm 14 for backwashing along with a portion of the cleaning liquid. The hollow arm 13 is a bearing 1
1, and is constantly rotated at low speed by a geared motor 15 via a gear 12. Thus the hole 13 and the inlet hole 14 of the hollow arm 14
The foreign matter accumulated in the hole 13, which overlaps periodically with the hole 13, is discharged to the outside from the discharge port 10.
In the figure, reference numeral 4 indicates a tightening bolt that connects the main body 1 and the upper lid 5 with the partition plate 6 in between in a watertight manner.

A plurality of conical holes 13 are provided radially on the partition plate, and the inlet hole 14a of the hollow arm has a width and a length that act on one line of the radius of the partition plate.

This invention has the above-mentioned configuration, and has the following features: 1. During filtration, the flow is as shown by the cross mark, and a vortex is generated around the outer periphery of the large diameter part of the conical hole, so that foreign substances are not strongly pressed against the filtration material. Therefore, foreign matter is removed during backwashing and does not cause clogging.

2 Since the leak material is installed on the large diameter side, a large filtration area can be obtained.

3 On the small diameter side, the distance between the holes is large, so lint etc. does not get caught on the partition wall between the holes, and foreign matter accumulates inside the conical hole, so the hollow arm rotates. There is no chance of foreign objects getting caught on the contact surface with the partition plate when moving.

4. As the filter material can be a sheet of filter cloth, wire mesh, etc., various meshes suitable for foreign objects can be used and replaced with simple work.

It has the following effects and is extremely effective in practice.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a conical hole portion of a partition plate. 1a...Polluted liquid section, 5a...Purified liquid section, 6
... Partition plate, 8 ... Filter material, 13 ... Conical hole,
14...Hollow arm, 14a...Inlet hole.

Claims (1)

[Claims] 1. In a strainer that is divided into a polluted liquid section and a purified liquid section by a filter partition plate, and has a backwashing device that continuously discharges foreign matter to an impurity discharge port whose pressure is lower than that of the purified liquid section, the partition plate has a large number of A conical hole is provided, the large diameter side of which is directed toward the purified liquid section, and the small diameter side of which is directed toward the polluted liquid section. A backwashing device consisting of a hollow arm is rotatably installed in the polluted liquid section so that its inlet hole opens on the small diameter side of the conical hole. Backwash strainer.