JPS61234294A - Residual water disposer of submersible pump - Google Patents

Abstract

PURPOSE:To complete residual water disposal by separating the peripheral bottom edge of a cup-shaped resilient membrane from a bottom plate and holding a gap between the upper peripheral edge of the membrane and a suction cover thereby opening a passage when a swing valve is operated to be turned up, and closing the passage when the swing valve is operated to be turned down. CONSTITUTION:Since a negative pressure is generated under the impeller of a submersible pump when the pump is started at a water level l1, a swing valve 7 is operated to be turned up, the lower peripheral bottom edge 13 of a cup-shaped resilient membrane is separated from a bottom plate 4, and a given gap (g) is held between the upper peripheral edge 15 and a suction cover 2. In result, a passage 17 from the bottom edge, of an annular seat portion 11 to the suction opening 3 of the pump is opened and the water sucked from narrow gaplike passages 12...12 provided in extremely low positions is discharged from a discharge opening (not shown) via the passage 17 and the inside of a pump casing 1. And, when the submersible pump is stopped at a water level l2 whereat drainage is completed, the swing valve 7 is operated to be turned down by the pressure of return water in the pump casing 1 and a piping for the drainage, the peripheral bottom edge 13 of the valve 7 is brought into close contact with the upper surface of the bottom plate, thus enabling the water to be prevented from making backflow.

Description

[Detailed Description of the Invention] ■Object The present invention relates to a residual water treatment device 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 residual water. This is the reality, and therefore, it is impossible to use the submersible pump to suck up water from the floor. As a measure to enable drainage at low water levels, there are some methods in which the opening position of the pump suction port is made as low as possible, but this has the disadvantage that water in the pump sink and pipes flows backwards when the pump is stopped. have.

The purpose of the present invention is to eliminate the conventional drawbacks as mentioned above,
Drains completely at low water levels without creating residual water,
Moreover, it is an object of the present invention to construct a submersible pump that does not cause backflow of water even when the pump is stopped, and can also be used for the work of sucking up accumulated water on the floor.

(2) Configuration In the residual water treatment device for a submersible pump according to the present invention, the bottom plate is fixed at a predetermined distance from the suction cover that constitutes the lower bottom of the pump swirl chamber, and the gap between the facing surfaces of the suction cover and the floor plate is fixed. An annular mantle wall is provided in the mantle, and a swing valve is installed inside the mantle wall to reverse the movement up and down using the center of the bowl-shaped elastic membrane as a fulcrum. A stopper is provided on the lower surface, an annular seat is provided around the lower surface of the bottom plate, and a number of narrow gap-like water holes are carved on the lower edge of the seat, and one goes from the bottom of the bottom plate to the recess on the lower surface of the swing valve. By opening the suction hole, when the swing valve is operated upward, the lower edge of the periphery of the bowl-shaped elastic membrane is separated from the top of the bottom plate, and a predetermined gap is maintained between the upper edge of the periphery and the suction cover. A water passage is opened from the outer periphery of the lower edge to the pump suction port, and when the swing valve is rotated downward, the lower edge of the periphery of the bowl-shaped elastic membrane comes into close contact with the bottom plate to close the water passage. I am forced to do so.

To explain the drawings of the embodiment, l is the pump vortex chamber,
Reference numeral 2 denotes a suction cover constituting the lower bottom of the pump swirl chamber 1, and a pump suction port 3 is bored in the center. Reference numeral 4 designates a bottom plate fixed at a predetermined distance S from the suction cover 2, and 5 designates a mounting bolt for fixing the bottom plate 4 together with the suction cover 2. Reference numeral 6 denotes a stud bolt planted in the center of the upper surface of the bottom plate 4; 7 is a swing valve in which the center of a bowl-shaped elastic membrane is fixed to the stud bolt;
Within the annular mantle wall 8 that is disposed between the facing surfaces of the bowl-shaped elastic membrane and the bottom plate 4, the bowl-shaped elastic membrane is rotated vertically around the center thereof as a fulcrum. 9... 9 is a suction hole opened from the bottom of the bottom plate 4 toward the lower surface recess lO of the swing valve 6; 11
is an annular seat attached to the periphery of the lower surface of the bottom plate 4, and a number of narrow water holes 12-12 are carved in the lower edge of the annular seat. During the downward movement of the swing valve 7, the peripheral lower edge 13 of the bowl-shaped elastic membrane comes into close contact with the bottom plate 4. It is desirable to provide a resilient protrusion 14 on the lower edge 13 of the periphery, and it is best to form the protrusion 14 sharply so that the close contact portion is in line contact.

Furthermore, when the swing valve 7 is turned upward, a predetermined gap g must be maintained between the upper peripheral part 915 of the bowl-shaped elastic membrane and the suction cover 2, but it is necessary to ensure that the internuclear gap @g is maintained. Stoppers 16 . shall be established.

To apply the device of the present invention, the bottom plate 4 with the swing valve 7 attached thereto can be fixed together with the annular jacket wall 8 in the place where the bottom plate of the strainer stand of a ready-made submersible pump has been removed.

When the submersible pump is stopped, the downward movement of the swing valve 7 brings the peripheral lower edge 13 of the bowl-shaped elastic membrane into close contact with the bottom plate 4, so that the suction holes 9...9 of the bottom plate 4 and the pump suction port 3 are in close contact with each other. is in a state where 4 letters have been sent.

However, when the submersible pump is started at the water level t1, negative pressure is generated at the bottom of the impeller, so the swing valve 7 is rotated upward, and the peripheral lower edge 13 of the bowl-shaped elastic membrane is separated from the top of the bottom plate 4, causing the suction hole 9 ... 9 and the pump suction port 3 are in a state of conduction, and therefore the water passage 17 leading from the outer circumference of the lower edge of the annular seat portion 11 to the pump suction port 3 is opened. 12...The water sucked from 12 is passed through Wr17
Water is drained from the discharge port (not shown) through the inside of the bong casing 1.When the submersible pump stops at the completed water level t2, the pressure of the return water inside the bong casing 1 and the drainage piping path causes the water to drain. Since the swing valve 7 is rotated downward and its peripheral lower edge 13 comes into close contact with the bottom plate 4, a backflow prevention function is activated.

Note that the elastic convex 14 is provided on the bottom plate 4, and the convex 14 is
If it is formed sharply, the lower mount 1 around the swing valve 70
3 are in close linear contact with each other to enhance the sea μ effect, and to prevent large objects such as sand grains from clogging the close contact area.

(8) Effects According to the present invention, the narrow water passage ports 12 . 2
Because it is connected to the inside, drainage can be completely carried out at low water levels without residual water, and there is an added advantage that water does not flow back even when the pump is stopped. It can also be used for blotting work. Furthermore, in carrying out the present invention, it is sufficient to fix the bottom plate 4 with the swing valve 7 attached together with the annular mantle wall 8 in the part of the existing submersible pump from which the bottom plate has been removed. The quality is extremely high.

[Brief explanation of drawings]

'yIi is a longitudinal cross-sectional side view of a narrow part of a submersible pump equipped with the device of the present invention, and FIG. 1 shows a stopper provided on the upper edge of the peripheral portion of the bowl-shaped elastic membrane and elastic convexes provided on the bottom plate. An example, Fig. 2 is an example in which a stopper is provided on the lower surface of the suction cover and elastic convexes are provided on the lower edge of the periphery of the bowl-shaped elastic membrane.
[M] in FIGS. 1 and 2 shows the swing valve when the swing valve is being rotated downwardly, and (B) in FIGS. 1 and 2 shows the state when the swing valve is being rotated upwardly. 1... Pump vortex chamber, 2... Suction cover, 8...
Pump suction port, 4... Bottom plate, 7... Swing valve, 8
...Annular mantle wall, 9--Suction hole, 10--Bottom recess, 11--Annular seat, 12--Narrow gap-shaped water inlet, 14--Bowl-shaped elasticity Upper edge of peripheral portion of membrane, 16... Stopper, 17... Water passage, S... Predetermined interval. Patent applicant: Mushimi Co., Ltd. f'P ¥1 Nora E [
A)

Claims (1)

[Claims] The suction cover (2) that constitutes the bottom of the pump swirl chamber (1)
), fixing the bottom plate (4) at a predetermined distance (S) from
An annular mantle wall (8) is provided between the opposing surfaces of the suction cover (2) and the bottom plate (4), and within the mantle wall (8), the center of the bowl-shaped elastic membrane is used as a fulcrum to move up and down. A swing valve (7) that operates in reverse is installed, and a stopper (
16)...(16) is provided, an annular seat (11) is provided around the lower surface of the bottom plate (4), and a narrow water inlet (12) is provided at the lower edge of the annular seat (11)...(12) ), and a recess (10) on the lower surface of the swing valve (7) from below the bottom plate (4).
By opening the inward suction hole (9), when the swing valve (7) is rotated upward, the lower edge of the periphery of the bowl-shaped elastic membrane is separated from the top of the bottom plate (4) and the upper edge of the periphery (15). A predetermined gap (g) is maintained between the suction cover (2) and the pump suction port (
3), and when the swing valve (7) is operated downward, the peripheral lower edge (13) of the bowl-shaped elastic membrane is opened.
2.) A residual water treatment device for a submersible pump, characterized in that the water passage (17) is closed by being brought into close contact with the bottom plate (4).