JPS6349592Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Purpose The present invention relates to a residual water treatment adapter for a submersible pump.

In general, the lowest water level that can be drained from the installation floor of a submersible pump is limited by the height of the strainer stand, etc., and complete drainage is not possible at low water levels, resulting in several centimeters of residual water. was the reality. In addition, as a countermeasure to this problem, there are some systems in which the opening position of the water inlet is made as low as possible to perform low water level drainage, but this has the disadvantage that water inside the pump casing and piping flows backwards when the pump is stopped. ing.

The purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional technology, and to create an underwater system that completely drains water at low water levels without leaving any residual water, and also prevents water from flowing back even when the pump is stopped. The purpose is to configure the pump.

(2) Structure In the residual water treatment adapter for a submersible pump according to the present invention, the upper circumferential edge of the panel, which is provided with a circulation hole that is spaced apart from and facing the suction port on the bottom of the pump casing, is watertightly connected to the bottom of the pump casing. a suction casing formed to be connected to the suction casing, a bellows having an annular tongue whose annular base is watertightly connected to the suction casing and guided down in a constricted manner toward the inner circumference; It consists of a bottom plate that is fixed at a slight distance from the bottom surface and forms an annular pressure-receiving surface that the annular tongue piece of the bellows comes into pressure contact with at the peripheral edge, and a It is characterized by forming an annular suction port with a backflow prevention structure and forming a reservoir chamber in the suction casing that communicates from the annular suction port into the pump casing.

To explain the drawings of the embodiment, reference numeral 1 denotes a suction casing, in which a circulation hole 3 facing away from the suction port 2 on the lower bottom surface of the pump casing is provided in the center of the panel surface, and an upper edge 4 on the circumferential side is provided with a suction casing. It is formed to be watertightly connected to the lower bottom of the casing 5. 6 is a bellows with an annular base 7
is connected to the suction casing 1 in a watertight manner, and has an annular tongue piece 8 that is guided down in a narrowed manner toward the inner circumference. Reference numeral 9 denotes a bottom plate, which is fixed at a slight distance from the lower bottom surface of the suction casing 1, and has an annular pressure-receiving surface 9 formed at its peripheral edge to come into pressure contact with the annular tongue piece 8 of the bellows 6. There is. 10 is a mounting bolt for fixing the suction casing 1 to the lower bottom of the pump casing 5, and 11 is an annular packing for making the connection between the circumferential upper edge 4 of the suction casing 1 and the lower bottom of the pump casing watertight. , 12 is the bottom plate 9
This is a mounting bolt for fixing the suction casing 1 below the suction casing 1.

By connecting the circumferential upper edge 4 of the suction casing 1 to the lower bottom of the pump casing 5 in a watertight manner, the pressure contact portion between the annular tongue piece 8 of the bellows 6 and the circumferential pressure receiving surface 9' of the bottom plate 9 is formed. An annular suction port 13 having a backflow prevention structure is formed, and the annular suction port 13
Thus, a reservoir chamber 14 communicating into the pump casing 5 is formed within the suction casing 1.

When the submersible pump is stopped, the annular tongue 8 of the bellows 6 is elastically pressed against the peripheral pressure-receiving surface 9' of the bottom plate 9.
The annular tongue 8 is pressed upward and the annular suction port 13 of the backflow prevention structure is kept closed. However, when the submersible pump is started at the water level _l1 , negative pressure is generated under the impeller, causing the annular tongue 8 to rise above the annular pressure surface 9', opening the annular suction port 13 and allowing water to pass through.
Water sucked in through the annular suction port 13 flows through the flow port 3 into the storage chamber 14, filling the storage chamber 14, and is drained from the suction port 2 through the pump casing 5 and the discharge port 15. When the submersible pump stops at the drainage completion water level _l2 , the pressure of the return water in the pump casing 5 and the piping presses the annular tongue 8 of the bellows 6 against the pressure-receiving surface 9' of the bottom plate 9, blocking the annular suction port 13 and preventing backflow.

(3) Effects According to the present invention, the annular suction port 1 with a backflow prevention structure
3 is opened at an extremely low position close to the floor surface on which the submersible pump is installed, so drainage is completely carried out at low water levels without residual water, and water does not flow back even when the pump is stopped. There is an advantage. In addition, since the storage chamber 14 is formed in the suction casing 1 and holds a large amount of water, the suction casing 1 has an excellent feature that the suction effect of the pump does not deteriorate even if air is sucked in during treatment of residual water. To implement the present invention, it is sufficient to attach the residual water treatment adapter of the present invention to the part of the existing submersible pump from which the strainer stand has been removed, so its practical value is extremely high. .

[Brief explanation of the drawing]

Figure 1 is a vertical side view of the residual water treatment adapter of the present invention, and Figure 2 is a vertical side view of the constituent members of the residual water treatment adapter of the present invention, where [A] is a suction casing, [B] is a bellows, and [A] is a suction casing, [B] is a bellows, and [A] is a suction casing. C] indicates the bottom plate.
FIG. 3 is a longitudinal sectional side view of the main parts of a submersible pump equipped with the residual water treatment adapter of the present invention. 1... Suction casing, 2... Suction port on the bottom of the pump casing, 3... Distribution hole in the center of the board, 4... Upper edge on the circumferential side of the board, 5... Pump casing, 6... Bellows, 7 ... Annular base of bellows, 8 ... Annular tongue piece of bellows, 9 ... Bottom plate,
9'... Annular pressure receiving surface of the bottom plate, 13... Annular suction port with backflow prevention structure, 14... Storage chamber formed in the suction casing.

Claims (1)

[Scope of Claim for Utility Model Registration] Upper circumferential edge 4 of the panel surface provided with a flow hole 3 facing away from the suction port 2 on the lower bottom surface of the pump casing.
The suction casing 1 is formed to be watertightly connected to the lower bottom of the pump casing 5. A bellows 6 has an annular tongue piece 8 which connects an annular base part 7 to the suction casing 1 in a watertight manner and is guided down in a constricted manner toward the inner circumference. A bottom plate 9 is fixed at a certain distance from the lower bottom surface of the suction casing 1, and has an annular pressure receiving surface 9' formed at the peripheral edge thereof with which the annular tongue piece 8 of the bellows 6 comes into pressure contact. An annular suction port 13 made of the above-mentioned member and having a backflow prevention structure at the pressure contact portion between the annular tongue piece 8 and the annular pressure receiving surface 9'.
A residual water treatment adapter for a submersible pump, characterized in that a reservoir chamber 14 is formed in the suction casing 1 and the annular suction port 13 communicates with the inside of the pump casing 5.