JP2947087B2 - Anti-vibration device for preceding standby pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for a precedence type pump which is installed in a drainage station or the like and which can operate at full speed before the amount of inflow water such as rainwater increases.

[0002]

2. Description of the Related Art As a conventional apparatus for performing full-speed in-air operation in advance by predicting an increase in water level due to inflow of rainwater or the like, a through-hole is provided in a suction casing, and an intake passage is connected to the through-hole. A device that sucks air from the intake passage when the water level falls below the impeller and switches to in-air operation is known as described in, for example, Japanese Patent Publication No. 5-9640.

[0003]

However, the above-mentioned conventional apparatus aims at enabling full-speed operation while preventing vibration and noise of the pump, and is capable of quickly switching from submerged operation to in-air operation. However, the water did not fall at a stretch, causing vibration and noise due to the air / water mixing operation, and there was a risk of damage to the impeller.

[0004]

SUMMARY OF THE INVENTION The present invention enables full-speed operation while preventing vibration and noise. The structure of the present invention is that an air chamber provided with an intake pipe is provided with a pump below the impeller.
Provided on the peripheral portion of the flop casing, when the water level is positioned impeller downwards, in the pump casing Te vertical shaft pump odor disabling the pumping and sucking air, an air inlet communicating with the air chamber, the vane The tip of a plurality of eddy current prevention plates suspended from the pump casing below the vehicle and the opening in the pump casing between the eddy current prevention plates, and the vertical bearing of the intermediate bearing of the pumping pipe
A, a plurality of ribs along the central axis of the riser pipe, the
Ribs and intermediate bearings are arranged in the same axial direction to reduce vibration and noise.
This is to prevent it.

[0005]

When the water level drops to below the impeller, air is supplied from the intake pipe to the air chamber provided on the periphery of the pump casing, and air is supplied from the inner peripheral surface of the pump casing and the tip of the vortex preventing plate. Will be sent. That is, air is simultaneously supplied from the periphery and the center of the impeller chamber, and the water below the impeller drops at a stretch, shortening the air-water mixing operation, and reducing the vibration and noise caused by the air-water mixing operation. On the other hand, when the water level rises above the impeller, the operation shifts from in-air operation to air-water mixing operation and normal operation.However, the inflow water into the pump is guided by the eddy current prevention plate provided in the pump casing, Noise is prevented, and vibration is prevented by the effect of reinforcing the pump casing by the eddy current prevention plate. Furthermore, since the reinforcing ribs are provided on the discharge casing , the discharge water is rectified, and a synergistic effect with the swirl prevention plate is achieved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. First, in FIG.
Is an impeller of a vertical mixed flow pump, and 3 is a pump casing. An annular air chamber 5 in which an intake pipe 4 is disposed is provided in a peripheral portion of the pump casing 3 below the impeller 2.
Inside the pump casing 3, a plurality of eddy current preventing plates 6 for rectifying the inflow of water into the pump are provided so as to prevent the water supplied to the impeller 2 from being swirled.
The eddy current prevention plate 6 also serves as a reinforcing rib of the pump casing 3 and can prevent vibration of the pump casing. An intake hole 7 communicating with the air chamber 5 is provided between the tip of the eddy current prevention plate 6 and the eddy current prevention plate 6.6, and air supplied from the intake pipe 4 is supplied to the pump casing below the impeller 2. 3 can be simultaneously supplied from the inner peripheral portion and the vicinity of the central portion. Reference numeral 8 denotes a pumping pipe,
A plurality of reinforcing ribs 9 are provided inside the pumping pipe 8 to provide intermediate bearings.
Oh and disposed along the central axis of the riser pipe 8 and below the 13
You. An intermediate bearing between the plurality of ribs 9 and the pumping pipe 8
13 and the same axis in the vertical direction.
As with the vortex prevention plate 6 , the water flow in the pumping pipe 8 is made uniform.
In addition, vibration due to air suction during suction can be suppressed by the reinforcing effect. Reference numeral 10 denotes a discharge bowl, 11
Is a guide blade provided on the discharge bowl 10 , and 12 is a drive shaft of the impeller 2 .

[0007]

The present invention is configured as described above,
When the water level falls below the impeller, air is simultaneously supplied to the inner periphery and the center of the pump casing below the impeller, so that the gas-liquid mixing operation can be shortened and vibration can be reduced. In addition, the swirl prevention plate prevents the swirl of the inflow water, makes the flow uniform, and has a reinforcing effect, and can suppress the vibration due to the air suction during the suction. In addition, the pumping pipe has the same axis as the intermediate bearing.
It is located inside the pumping pipe at the same time as the reinforcing effect of the pumping pipe.
In this way, the water flow becomes uniform, and vibration and noise can be suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a vibration preventing device for a preceding standby type pump according to the present invention.

FIG. 2 is a sectional view of the pump casing below the impeller, taken along line AA of FIG.

FIG. 3 is a sectional view of the pumping pipe taken along the line BB of FIG. 1;

[Explanation of symbols]

2 impeller 3 pump casing 4 intake pipe 5 air chamber 6 eddy current prevention plate 7 intake hole 8 pumping pipe 9 rib 13 intermediate shaft

Claims (1)

(57) [Claims] 1. An air chamber (5) in which an intake pipe (4) is arranged.
Around the pump casing (3) below the impeller (2)
Only, when the water level is located in the impeller (2) below, in vertical shaft pump disabling the pumping and sucking air into the pump casing (3) in an intake hole communicating with the air chamber (5) ( 7) are attached to the tip of a plurality of eddy current prevention plates (6 ...) suspended from the pump casing (3) below the impeller (2).
An opening is formed in the pump casing (3) between the vortex preventing plates (6.6) and an intermediate bearing of the pumping pipe (8).
13 above and below along the central axis of the water pipe (8).
A rib (9 ...) is provided , and the rib (9 ...) and the intermediate bearing (1 ) are provided .
(3) is arranged on the same axis line, and is a standby in advance.
Anti-vibration device for pumps.