JPH0319929Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is used in sewage treatment plants, wastewater treatment plants, sewage relay pump stations, etc., where foreign matter enters and blocks the submersible pump installed in the tank. Regarding screens that prevent

(Conventional technology and its problems) Conventionally, submersible pump devices installed at the aforementioned sewage relay pump stations, etc. have to stop operation each time the submersible pump becomes clogged with foreign matter mixed into the inflowing sewage. It was then pulled out to remove foreign matter. In particular, at sewage relay pump stations where sewage constantly flows in, if the pumps are stopped for a long time, sewage may flow back into households or overflow from manholes onto the ground. Therefore, this contaminant removal work is
It must be done immediately and within a short period of time as soon as a blockage is confirmed. In addition, there are cases where screen equipment is installed inside the pump station, but in this case, a special space is required for the screen equipment, the equipment cost is high, and the work to remove foreign matter from the clogged screen is carried out inside the tank. The process of removing foreign matter from the tank is complicated and time-consuming.

(Means for solving the problem) The screen according to the present invention has an open bottom, a screen surface on at least the outer circumferential surface, a guided member protruding from the side, and a guide column that stands upright in the tank. It is characterized in that the guided member is engaged so as to be able to move up and down, and in the lowered state surrounds a submersible pump installed at the bottom.

(Operation) The submersible pump is operated while being surrounded by a screen. During this operation, relatively large foreign objects such as pieces of paper, kitchen garbage, pieces of cloth, pieces of vinyl, empty cans, and driftwood mixed in the sewage become entangled and adhere to the screen surface. When removing foreign matter, first stop the operation of the submersible pump, then pull up the screen with foreign matter on it along the guide column, lower the spare screen to surround the submersible pump, and immediately stop the pump. resume driving. Thereafter, the removed screen is placed outside the tank to remove impurities. Therefore, the time during which the pump is stopped due to this work is extremely short, and problems such as sewage overflowing from the manhole, which are conventional, do not occur.

(Example) Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 to 3. For convenience of explanation, the left and
The right side is called the "front" and "back" (or "back"), respectively.

1 is a sewage tank of a sewage relay pumping station, into which sewage W constantly flows from a sewage pipe 2. 3 is a submersible pump device installed in the sewage tank 1 and has the following configuration. That is, 4 is a leg stand fixed to the tank bottom 1a of the sewage tank 1,
A curved discharge pipe connecting fitting 5 is fixedly installed on the upper part, and the discharge pipe connecting fitting 5 has a pump connecting flange 5a vertically formed on the horizontal opening end side, and a discharge pipe connecting fitting 5 on the vertically upper opening end side. The pipes 6 are connected vertically, and the discharge pipe 6 is bent horizontally from the upper part of the tank and opens into a drainage ditch (not shown) when it comes out of the tank.

Reference numeral 7 designates a pair of parallel guide columns vertically installed on the back of the flange 5a of the discharge pipe connecting fitting 5, and is made of pipe material. It is fixed. 8 is a manhole that closes off the opening 1b.

Reference numeral 9 denotes a submersible pump to which a submersible electric motor is directly connected, and a connecting flange 9b that can be slidably connected to the flange 5a is formed at the tip of the horizontal discharge port 9a ₁ of the pump casing 9a. ,
A guide fitting 10 and a hook fitting 11 are integrally protruded beyond the upper part of the flange 9b. Of these, the guide fitting 10 engages with the two guide columns 7 to guide the pump when it goes up and down, and the hook fitting 11 allows the submersible pump 9 to be lowered by being guided up and down by the guide columns 7, so that the flange 9b is lowered. A locking surface 5 formed in an inclined shape on the upper back surface of the flange 5a when it slides into contact with the flange 5a of the discharge pipe connecting fitting 5 in an overlapping state.
a ₁ to hold the submersible pump 9 so that the lower suction port 9c of the pump casing 9a is positioned at an appropriate height from the tank bottom 1a.

12 is a lifting ring attached to the upper part of the submersible pump 9, which connects the lifting chain 13 and lifts the lifting chain 1.
The upper end of the pump 3 is hooked onto the inner wall of the opening 1a at a suitable position, and is connected to an appropriate chain block CB (not shown) provided outside the tank only when the pump is being raised or lowered. 14 is a power supply cable led out from a power supply board (not shown) installed outside the tank, and the other end is connected to the submersible pump 9.
It is connected to the upper terminal box 9d.

Reference numeral 100 denotes an elevating screen that surrounds the submersible pump 9 and prevents foreign substances from entering the submersible pump 9, and has the following configuration. Said screen 1
00 is formed entirely into a cylindrical shape with upper and lower openings, and screen bars 103 are arranged in a vertical lattice shape with appropriate intervals between a horizontal upper disk 101 and a lower disk 102.
The entire outer surface is formed into a screen surface. Reference numerals 104 and 105 denote reinforcing bars around which the screen bar 103 is wound at positions that approximately divide the space between the upper disk 101 and the lower disk 102 into three equal parts. The screen 100 is attached to the lower disc 10 so as not to interfere with the discharge port 9a ₁ of the pump casing 9a during descent.
A notch 106 is formed in the lower part of the front surface including 2 and the screen bar 103, and the notch 106 has a flexible elastic plate 107 with a vertically cut out central portion in order to make the opening area of the notch as small as possible. (preferably a synthetic rubber plate) is attached. Further, a vertically elongated opening 108 is formed at the back of the screen 100 over the entire length in the upward direction, and the power supply cable 1
This is to prevent interference with 4.

Reference numeral 109 denotes a guided member provided on the screen 100, including a horizontal plate 109a whose base is fixed to the front surface of the upper disk 101 and extends horizontally in front, and a semicircular shape on the left and right front parts of the horizontal plate 109a. The notches have groove openings 109b ₁ , 10 back to back in the semicircular notches.
9c Left and right ₁ with a semi-elliptic cross section, with the upper part fixed and hanging downward for an appropriate length with 1 pointing outward to the left and right
The groove openings 109b ₁ and 109c ₁ are engaged with the two guide columns 7 and 7 from inside so as to be vertically slidable. Reference numeral 110 denotes three lifting rings attached at approximately equal angular positions on the upper surface of the upper disk 101, and the lower three-branch tips of the lifting chain 111 are attached to the upper end of the lifting chain 111 at appropriate positions on the inner wall of the opening 1a. It is connected to the chain block CB only when the screen 100 is raised or lowered.

Therefore, in the submersible pump device 3, as shown in FIGS. 1 and 2, the screen 100 is connected to the lower disk 102.
The submersible pump 9 is operated with the submersible pump 9 placed on the tank bottom 1a and surrounding the submersible pump 9. While the submersible pump 9 is operating, the sewage W flowing into the sewage tank 1 from the sewage pipe 2 contains garbage, cloth, plastic bags, empty cans, etc.
When relatively large foreign objects such as driftwood are mixed in, these foreign objects collide with the screen 100 or become entangled with and adhere to the screen bar 103, and are prevented from entering the screen 100. screen 1
00, first stop the operation of the submersible pump 9, open the manhole 8, and move the lifting chain 111 to the chain block CB.
and pull the screen 100 out of the tank along the guide pillars 7. Then, instead, the previously cleaned screen 100 is pulled down along the guide column 7, surrounds the submersible pump 9 as shown in FIGS. 1 and 2, and then the submersible pump 9 is immediately restarted. Thereafter, the screen 100 that has been salvaged is cleaned by removing the attached foreign matter.

In addition to the above-described embodiments, the present invention can also be modified as described below.

(A) Although the screen 100 has a cylindrical shape as a whole, it may also have a rectangular shape.
Although the entire upper surface of the submersible pump 9 is opened, an opening through which the elevating chain 13 of the submersible pump 9 is inserted may be left to form a grid-like screen surface.

(B) The guide column 7 is made of a set of two round pipes, but it can also be made of square pipes, U-shape, I-shape, H-shape, etc.
It may also be used as a channel material for shapes etc. In this case,
The number of guide columns 7 may be one.

(C) The submersible pump 9 and the screen 100 are moved up and down along a common guide column 7,
Each may be a separate guide pillar. Further, although the lower end of the guide column 7 is fixed to the discharge pipe connecting fitting 5, it may be fixed directly to the tank bottom 1a.

(Effects of the invention) As explained above, the screen according to the invention can be raised and lowered along guide columns installed inside the tank, and when descending it surrounds the submersible pump installed at the bottom of the tank, so that sewage pieces of cloth mixed in,
Relatively large foreign objects such as vinyl pieces, empty cans, and driftwood are blocked by the screen and prevented from entering the screen, so there is no fear that the submersible pump will suck in such foreign objects and become clogged.
What's more, the work to remove foreign matter adhering to the screen can be done outside the salvage tank, and the spare screen can be lowered to surround the submersible pump and operation of the submersible pump can be resumed immediately. The outage time is extremely short, and there is no risk of sewage backing up into sewer pipes or overflowing from manholes, which is the case with conventional systems, where operations are stopped for a long time. Furthermore, the screen of this invention has a simple structure that just surrounds the submersible pump, and does not require special space like conventional screen equipment, making it possible to make relay pumping stations more compact, or to use existing pumps in small spaces. It is a simple and inexpensive structure that can be easily installed without any special construction at the site, and has great effects.

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing the installed screen of the present invention, FIG. 2 is a side view taken along the arrow .about. in FIG. 1, and FIG. 3 is a plan view taken along the arrow .about. in FIG. 1. In the figure, 1 is a sewage tank, 3 is a submersible pump device, 5 is a discharge pipe connecting fitting, 7 is a guide column, 9 is a submersible pump, 100 is a screen, 103 is a screen bar, and 109 is a guided member.

Claims (1)

[Scope of utility model registration request] The bottom surface has an open shape, a screen surface is formed on at least the outer peripheral surface, a guided member is provided protruding from the side, and the guided member is engaged with a guide column set upright in the tank so as to be able to move up and down, and the guided member is lowered. A screen for a submersible pump, characterized in that it surrounds a submersible pump that can be installed at the bottom of the screen.