JP2002285635A - Sewage suction-discharge device equipped with cushion tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewage suction-discharge device equipped with a cushion tank, which can easily suck in and discharge sewage into which foreign matter, solid matter and other liquids are mixed. SOLUTION: The sewage is sucked into the cushion tank 1 by an air intake and exhaust device 4 without being directly sucked in with a pump, and sucked in and discharged with the pump after undergoing gas-liquid separation and removal of the foreign matter and the solid matter in the cushion tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage suction / discharge device provided with a cushion tank for suctioning / discharging sewage containing foreign matter and solid matter in a sewage tank of a factory or the like.

[0002]

2. Description of the Related Art Conventionally, sewage is pumped and discharged from a sewage tank of a factory or the like by hand or directly by a sewage pump.

[0003]

The conventional manual method is very time-consuming. In the method using the direct suction of the sewage pump, foreign matter and solid matter are contained in the sewage and are directly sucked into the sewage pump, so that the sewage pump is clogged or the impeller in the sewage pump is destroyed. Problem had occurred.

[0004] Further, since various substances such as oil are mixed in the sewage as a liquid, the NP which is usually set with water is used.
Since SH is located outside the designed value of the suction lift, cavitation may occur in the pump and suction may not be possible. The present invention relates to foreign matter. It is an object of the present invention to provide a sewage suction / discharge device provided with a cushion tank capable of easily sucking and discharging sewage mixed with solids and other liquids.

[0005]

In order to achieve the above object, in a sewage suction / discharge device provided with a cushion tank according to the present invention, a cushion tank (1) has an opening at an upper part thereof.
A packing (2) is attached, a lid (3) provided with an air intake / exhaust device (4) on the top is provided so that air in the cushion tank (1) can be sucked, and the cushion tank (1) becomes an airtight chamber. To be openable and closable with a fastener such as a buckle.

A sewage suction pipe (5) is mounted near the upper part of the cushion tank (1), and a sewage discharge pipe (6) provided with a check valve (7) in the pipe is mounted near the lower part of the cushion tank (1).
A sewage submersible pump (8) having a drainage portion connected to a sewage discharge pipe (6) is provided at the inner bottom.

[0007] A solid strainer (9) for removing solids is provided at an appropriate position between the outlet of the sewage suction pipe (5) and the head of the sewage submersible pump (8) inside the cushion tank (1). 1) Removably attach to the inner circumference.

In order to detect the high water level line (A) and the low water level line (B) inside the cushion tank (1) on the inner wall of the cushion tank (1), a high water level detector (10) using a float and a low water level detection Machine (11) is provided.

The detection units of the high water level detector (10) and the low water level detector (11) may be electrode rods.

The sewage pump (8) may be provided in the sewage discharge pipe (6) outside the cushion tank (1). If the sewage pump (8) is installed outside the cushion tank (1), a normal sewage pump that does not require a special insulating structure may be used.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples and with reference to the drawings, including the operation. When the power switch is turned on, the low water level detector (11) operates, and the operation and the operation when the cushion tank (1) is empty are performed.
The sewage submersible pump (8) is in a stopped state, and the suction and exhaust device (4) starts operating. At this time, the air in the cushion tank (1) is discharged outside as indicated by arrows a and b. Also, at this time, a check valve (7) in the sewage discharge pipe (6)
Is closed by the suction action of the suction and exhaust device (4).
At this point, when the tip of a hose or the like connected to the sewage suction pipe (5) is put into the sewage tank, the sewage containing foreign matter and solid matter is sucked into the hose or the like, and the cushion tank (1) is moved as indicated by arrow c. ). At this time, the sewage sucked together with the air has a specific gravity difference, and the air is discharged to the outside by the suction / exhaust device (4) as indicated by arrows a and b, and foreign matters, solids and liquid are discharged from the cushion tank (1) as indicated by arrows d. ) Fall to the inner bottom. During the fall, it passes through the solid strainer (9), so that foreign matter and solid matter remain in the solid strainer (9). Thereafter, when the sewage reaches the high water level line (A), the high water level detector (10) operates, the intake / exhaust device (4) stops, the sewage submersible pump (8) starts operating, and the sewage is The water is sucked into the sewage submersible pump (8) as indicated by the arrow e, the check valve (7) is opened, and the sewage passes through the sewage discharge pipe (6) and is discharged to the outside as indicated by the arrow f. Thereafter, when the sewage reaches the low water level line (B), the low water level detector (11) senses this, the sewage submersible pump (8) stops, and the suction and exhaust device (4) operates again, This operation is sequentially repeated. The above is the basic operation of the configuration of the present invention. Once the sewage reaches the high water level line (A) and the sewage submersible pump (8) is operated, the intake sewage and the sewage drainage become almost parallel. If the head pressure in the cushion tank (1) exceeds the NPSH specific to the sewage submersible pump (8), the sewage submersible pump (8) can be operated continuously without idle operation such as cavitation. Will be done.

Further, during operation, foreign matter and solid matter accumulate in the solid strainer (9). This means that the lid (3) is opened and removed.

In this embodiment, the detection unit of the low water level detector (11) is a float, but it may be a water level electrode rod.

In this embodiment, the sewage submersible pump (8) is provided in the cushion tank (1). The sewage pump (8) is connected to the sewage discharge pipe (6) outside the cushion tank (1). ). If the sewage pump (8) is installed outside the cushion tank (1), a normal sewage pump that does not require a special insulating structure may be used.

Although the check valve of this embodiment is of the lift type, it may be of the axial flow type or of the swing type.

[0016]

Since the present invention is configured as described above, it has the following effects.

The drainage of sewage from a sewage tank is difficult by hand. Usually, sewage is directly pumped and discharged by a sewage pump, but the pump is a combination of an impeller, a guide and a cover. Since there is always a large and small clearance there, if a lot of solid matter exceeding this clearance is inhaled, clogging and destruction will occur there. Also, since the pump has its own NPSH,
When a liquid having a suction height and a boiling point lower than that of ordinary water is mixed, cavitation occurs inside the pump, and the suction becomes impossible.

According to the present invention, sewage is sucked directly into a cushion tank by a suction / exhaust device without sucking sewage directly by a pump, and gas-liquid separation, foreign matter,
Since the pump removes the solid matter,
There are no clogging, breakage and cavitation problems described above.

[0019]

[Brief description of the drawings]

FIG. 1 is a sectional view of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cushion tank 3 Lid 4 Suction / exhaust device 5 Sewage suction pipe 6 Sewage discharge pipe 6 Sewage discharge pipe 7 Check valve 8 Sewage submersible pump 9 Solid filter 10 High water level detector 11 Low water level detector

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shin Kawahara 1076 Yabe-cho, Totsuka-ku, Yokohama-shi, Kanagawa F-term (reference) 2D063 DB04 3H045 AA09 AA12 AA23 BA25 CA16 DA01 EA34 3H071 AA01 CC41 DD14 DD22 DD61 DD72 DD75 4D064 AA05 BK01

Claims (3)

[Claims] (1) A lid (3) provided with an air intake / exhaust device (4) at the upper part of the cushion tank (1) through a packing (2) at the upper opening of the cushion tank (1). Cushion tank (1) so that air can be sucked
Is fixed so that it can be opened and closed with a fastener such as a buckle so as to form an airtight chamber. (B) A sewage suction pipe (5) is mounted near the upper part of the cushion tank (1), and a sewage discharge pipe (6) provided with a check valve (7) in the pipe is mounted near the lower part. (C) At the bottom of the cushion tank (1), a sewage submersible pump (8) having a drainage part connected to the sewage discharge pipe (6) is provided. (D) At a suitable position between the outlet of the sewage suction pipe (5) inside the cushion tank (1) and the head of the sewage submersible pump (8), a solid strainer (9) for removing solids is provided. 1) Removably attach to the inner circumference. (E) In order to detect the high water level line (A) and the low water level line (B) inside the cushion tank (1), a high water level detector (1) using a float is installed on the inner wall of the cushion tank (1).
0) and a low water level detector (11) are provided. A sewage suction / discharge device provided with a cushion tank configured as described above. 2. The sewage suction / discharge device provided with a cushion tank according to claim 1, wherein the detection units of the high water level detector (10) and the low water level detector (11) are electrode rods. 3. The sewage suction / discharge device provided with a cushion tank according to claim 1, wherein the sewage pump (8) is provided in a sewage discharge pipe (6) outside the cushion tank (1).