JPS58172479A - Pump intake water tank - Google Patents

Abstract

PURPOSE:To suppress the transmission of a generated noise of a pump from water in a pump intake water tank to a wall of the pump intake water tank in which the pump is set, by providing a gas layer between the water in the pump intake water tank and side and bottom walls of the intake water tank. CONSTITUTION:A flexible bag body 6 is set through mounting fixtures to a pump intake water tank 1, in which a pump 4 is set, between a side wall 2 and a bottom wall 3 of the tank 1. Then gas is supplied to the body 6 from a compressor 8 while pressure in the body 6 is detected by a pressure switch 7 to start and stop the compressor 8. In this way, a generated noise from the pump 4 decreases permeability of acoustic energy by the gas in the body 6, and an emitted noise to the atmosphere can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump water suction tank, and in particular, prevents the sound generated from the pump from propagating through the pump water suction tank water, the pump water suction side wall, and being released into the atmosphere. The present invention relates to the structure of the pump water suction tank.

The structure of a conventional pump water suction tank will be explained with reference to FIGS. 1 and 2. 1 is a pump water suction tank, which is composed of a side wall 2 and a bottom wall 3, and is filled with pumped water, that is, internal water;
Pump 4 is submerged.

The internal water pumped up by the pump 4 is sent to a predetermined location through a discharge pipe 5. The sound generated from the pump 4 is transmitted from the internal water of the pump water tank 1 directly through the water tank wall 2 and released into the atmosphere, but when two objects are in contact, the acoustic resistance is R and 1, respectively. , R, 2, the acoustic energy transmittance T is expressed as T=4 (R1/R2)/(1+R1/R2), so the transmittance increases as R1/R2 becomes larger or smaller than 1. It is known that the acoustic resistance of water is R11, and the acoustic resistance of the water absorption tank wall (assumed to be concrete) is R2, then Rl = 14X l O'g/Cm""JIC
R2= 8 LX 10'g/Crn" -3eC
When water propagates directly from the water in the pump water tank to the wall of the pump water tank, R1/R2 = 0.173°T = 0
．． 5, which has the disadvantage that the sound emitted into the atmosphere from the pump water suction tank wall becomes louder.

The purpose of the present invention is to reduce the transmittance of acoustic energy when the sound generated from the pump is transmitted from the water in the pump water tank to the wall of the pump water tank, and to reduce the sound emitted from the wall of the pump water tank to the atmosphere. There is a particular thing.

In order to reduce the transmittance of acoustic energy from the water in the pump water tank to the wall of the pump water tank, a layer of gas should be installed between the pump and the wall of the pump water tank in order to reduce the transmittance of acoustic energy. is the most effective. Letting the acoustic resistance of air be R3, R3=41, and the ratio to the acoustic resistance R1 of water is 0.0003. The ratio to the acoustic resistance R2 of concrete is 0.00005, and the transmittance of acoustic energy is small, so the sound emitted into the atmosphere from the pump water suction tank wall is also small. This invention was made in view of the above-mentioned problems, and in a pump device in which a pump is installed in a pump water suction tank to pump up water, there is a gap between the water in the pump water suction tank, the side wall of the water suction tank, and the bottom wall of the water suction tank. A gas layer is provided at the top.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. I will explain.

l is the pump water suction tank, 2 is the pump water suction tank side wall, 3 is the pump water suction tank bottom wall, 4 is the pump, 5Fi discharge pipe, 6 is the pump 4
A flexible bag thrown between the water absorption tank side wall 2 and the water absorption tank bottom wall 3,
7 is a flexible bag body attachment; 8 is a compressor for supplying gas to the flexible bag body 6; 9 is a ninth unit that detects the pressure inside the flexible bag body 6 and starts and stops the compressor 8; It is a pressure switch.

Since there is a flexible bag 6 between the pump 4, the water suction tank side wall 2, and the water suction tank bottom wall 3, the sound generated from the pump 4 propagates as follows: Pump 3 → Water suction tank! Internal water → Gas inside the flexible bag 6 → Water absorption tank bottom wall 3 → Water absorption tank side wall 2 → Atmospheric pump 3 → Water inside the water absorption tank 1 → Gas inside the flexible bag 6 → Water absorption tank side wall 2 → In the atmosphere . Therefore, the acoustic energy transmittance is greatly reduced by the gas inside the flexible bag 6, and the sound emitted into the atmosphere is also reduced.

5 and 6 show other embodiments of the invention.

The VC between the pump 4 and the water suction tank bottom wall 3 has a structure in which no flexible bag is provided. In this embodiment as well, the acoustic energy propagating directly from the water in the water absorption tank 1 to the water absorption tank side wall 2 is transferred to the flexible bag body 6.
The sound emitted into the atmosphere becomes smaller.

FIGS. 7 and 8 show another embodiment of the present invention. In this embodiment, a steel plate 10 is attached between the pump 4, the side wall 2 of the water absorption tank, and the bottom wall 3 of the water absorption tank using a fixture 11.
0, the side wall 2 of the water absorption tank, and the bottom wall 3 of the water absorption tank, the same effect as in the previous embodiment can be obtained. In addition, in this embodiment, as shown in FIG.
It is preferable to attenuate the acoustic energy that propagates through the fixture 11 to the water absorption tank side wall 2 and the water absorption tank bottom wall 3.

According to the present invention, by providing a gas tank between the pump and the water suction tank wall, it is possible to attenuate the acoustic energy generated from the pump, which propagates through the water in the water suction tank, and is transmitted to the water suction tank side wall. It can reduce the sound emitted into the atmosphere.

[Brief explanation of drawings]

gIXI is a plan view of a conventional pump water suction tank, FIG. 2 is a vertical sectional view of FIG. 1, FIG. 3 is a plan view of a pump water suction tank according to the present invention, and FIG. 4 is a vertical sectional view of FIG. 3. , FIG. 5, and FIG. 6 are plan views, longitudinal cross-sectional views, and FIGS. 7 and 8 of other embodiments of the present invention.
The figures are a plan view and a vertical cross-sectional view of still another embodiment of the present invention, and FIG. 9 is a detailed vertical cross-sectional view of the fixture. 1... Pump water suction tank, 2... Water suction tank side wall, 3...
Water absorption tank bottom wall, 4...pump, 5...discharge pipe, 6...
・Flexible bag body. Agent Patent Attorney Toshiyuki Usuda fJ 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] A pump system in which a pump is installed in a pump water suction tank to pump water, wherein a gas layer is provided between the water in the pump water suction tank, the side wall of the water suction tank, and the bottom wall of the water suction tank. Aquarium.