JP2002005097A - Vibration prevention system for vertical shaft type pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration prevention system for a vertical shaft type pump which adjusts its setting and works without transmitting unnecessary stress to a pump even if ground subsidence occurs. SOLUTION: This is a vibration prevention system for a vertical shaft type pump 10 which is hung inside the water tank 55 from the floor 51 where the driving unit of pump driving is installed. The vibration prevention system is equipped with a vibration prevention damper 35 between the lower portion of vertical shaft type pump 10 and the bottom of water tank 55 which absorbs vibration of vertical shaft type pump, and also a slide measure which connects the vibration prevention damper 35 with the bottom of water tank 55 by inserting the lower portion of vibration prevention damper 35 into the cylinder portion 37a installed on the supporting material 37 of vibration prevention damper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shaft pump anti-swing device which can effectively prevent vibration of a vertical shaft pump.

[0002]

2. Description of the Related Art FIG. 4 is a view showing a vertical shaft pump installed as a drainage pump of a drainage station. As shown in the figure, the vertical shaft pump 80 is suspended from a floor 83 on which a pump driving motor 81 and the like are disposed in a water tank 85. When the water is increased due to rain or the like, the impeller in the vertical shaft pump 80 is driven to rotate by driving the electric motor 81, and the water in the water tank 85 is drained.

[0003] By the way, the vertical shaft pump 80 installed in such a drainage pump station has recently been increasingly operated as a preceding standby pump. Here, the preceding standby pump is a pump used to start driving the vertical shaft pump 80 in advance even when the water level is low, and to immediately pump the water when the water level rises. And, for example, when heavy rain is expected, all the water accumulated in the water tank 85 is discharged in advance by the vertical shaft pump 80,
It is used to respond immediately to a sudden rise in water.

However, when the vertical pump 80 is operated in the standby mode, the pump is operated even when the water level in the water tank 85 does not reach the suction port of the vertical pump 80 (aerial operation), and the water level rises. When the water level is low even when the water reaches the suction port and the drainage is started, the operation in which the water and gas are mixed in the drainage (air-water mixing operation) is compared with the normal steady operation (operation in which only water is pumped). There was a problem that the vibration became severe.

Conventionally, as shown in FIG. 4, for example, the vertical axis pump 80 and the bottom (inner wall) of the water tank 85 are fixed by a rod-shaped vibration isolating member 89, or the side of the vertical pump 80 and the side wall of the water tank 85 are fixed. (Inner wall) between the plate-shaped vibration isolating members 91
Or was fixed by.

However, the vibration isolating members 89, 9 having the above-described structure are used.
In the case where the vertical pump 80 is fixed in the water tank 85 by the method 1, when the ground subsidence occurs, the vibration isolating members 89 and 91
However, excessive force is transmitted to the vertical shaft pump 80 by forcibly pulling or pushing the vertical shaft pump 80, and there is a fear that the vertical shaft pump 80 may be inclined or the pump performance may be deteriorated.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a vertical shaft pump capable of following ground subsidence and transmitting no extra force to the pump even if land subsidence occurs. An object of the present invention is to provide an anti-sway device.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an apparatus for preventing a vertical pump from hanging from a floor in a water tank. An anti-vibration damper that absorbs vibration of the vertical pump is attached between the lower part of the vertical pump and the bottom of the water tank, and a slide means that can move vertically between the anti-vibration damper and either the water tank or the vertical pump is provided. Connected. Thereby, vibration of the vertical shaft pump can be prevented, and transmission of an extra force to the pump when the ground subsides can be prevented.

Further, the present invention relates to an anti-vibration device for a vertical shaft pump which prevents a vertical shaft pump suspended from a floor into a water tank, wherein the anti-vibration device prevents vibration between the vertical shaft pump and an inner wall of the water tank. A dash pot that is connected by a member and that generates a damping force in proportion to a vibration speed is attached to the vibration isolating member. This also prevents the vertical pump from vibrating and prevents the transmission of excess force to the pump when the ground subsides.

In order to change the mounting angle of the vibration isolating member to the vertical shaft pump or the water tank without resistance during land subsidence or the like, both ends of the vibration isolating member are connected by rotatable connecting means. Preferably, it is connected between the vertical pump and the inner wall of the water tank.

In order to adjust the longitudinal direction of the vibration isolating member,
Preferably, a length adjusting means is attached to the vibration isolating member.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side view showing a vertical shaft pump and an anti-swing device using an embodiment of the present invention. As shown in FIG.
A pump base plate 13 is fixed on an opening 52 provided in a floor 51, and a motor (driving means) 17 is installed thereon via a motor mount 15, while the discharge music fixed to the pump base plate 13 is provided. At the lower end of the pipe 19, a hanging pipe 21 and a discharge bowl 23
, A suction bell mouth 25 and a current plate attaching member 27, and a discharge pipe 31 is mounted on the discharge side of the discharge curved pipe 19. Note that a plurality of rectifying plates 29 for rectifying the fluid sucked into the suction bell mouth 25 are attached to the rectifying plate mounting member 27.

In this embodiment, an anti-vibration damper 35 for absorbing vibration of the vertical pump 10 is provided between the center of the lower surface of the rectifying plate mounting member 27 and the bottom of the water tank 55. The anti-vibration damper 35 is, for example, installed between the ground and a structure such as a building to absorb the vibration of the ground due to an earthquake or the like (impact-resistant supporting structure of the structure). Alternatively, other types of anti-vibration dampers, such as anti-vibration dampers that are used in automobiles and ships and attenuate the vibrations of the vehicles and ships, may be used.
Normally, the vibration damper 35 is configured using a vibration-proof elastic body using a spring, rubber, or the like, a hydraulic pressure, or the like, but it is needless to say that it may be configured using other various members.
In short, any structure may be used as long as it is a vibration damper having a structure that absorbs a sudden vibration exciting force and converts the vibration into a gentle operation.

The side of the vibration damper 35 to be attached to the rectifying plate mounting member 27 is fixed to the rectifying plate mounting member 27. On the other hand, the side of the anti-vibration damper 35 attached to the bottom surface of the water tank 55 is vertically movably attached to the anti-vibration damper support member 37 fixed to the bottom surface of the water tank 55. That is, a cylinder portion 37a is provided on the vibration damper support member 37, and a lower portion of the vibration damper 35 is inserted into the cylinder portion 37a as a piston to constitute a piston-cylinder mechanism (slide means).
Even if the vertical pump 10 moves up and down with respect to the bottom surface of the pump 5, the vibration damper 35 can smoothly follow this. The inner peripheral surface of the cylinder portion 37a has O
A dust seal 39 such as a ring or an oil seal is attached to prevent the slurry in the water in the water tank 55 from entering the cylinder portion 37a. In this embodiment, the sliding means is provided between the anti-vibration damper 35 and the bottom of the water tank 55, but the bottom of the water tank 55 and the anti-vibration damper 35 are fixed. A slide means may be provided.

When the electric motor 17 is driven, an impeller (not shown) installed in the suction bell mouth 25 is driven to rotate, so that water in the water tank 55 flows from between the flow straightening plates 29 into the suction opening of the suction bell mouth 25. And is discharged from the discharge pipe 31.

By the way, when the vertical pump 10 is operated as a preceding standby pump to perform an air operation or a gas-water mixing operation, larger vibrations are likely to occur than in the steady operation. Since the vibration damper 35 is provided between the water tank 55 and the bottom of the water tank 55, the vibration is absorbed, and the vibration does not become large.

On the other hand, even if the ground on which the vertical shaft pump 10 is settles and the gap between the bottom surface of the water tank 55 and the lower end of the vertical shaft pump 10 changes little by little, the sliding means will Only the lower portion of the vibration damper 35 slides in the cylinder portion 37a of the vibration damper support member 37, and no extra force is transmitted to the vertical shaft pump 10 from the vibration damper 35 side.

Since the vertical shaft pump 10 has a current plate attaching member 27 at its lower end, the vibration damper 35 is attached between the current plate attaching member 27 and the bottom surface of the water tank 55. In the case of the vertical pump 10 without the 27, it may be installed between the suction bell mouth 25 and the bottom of the water tank 55. In short, the vibration damper 35 is the vertical pump 1
What is necessary is just to attach between the predetermined part of the lower part of 0, and the water tank 55.

FIG. 2 is a schematic side view showing a vertical shaft pump using another embodiment of the present invention and its anti-swing device. In this embodiment, the structure of the vertical shaft pump 10 itself is the same as that shown in FIG. 1, and a detailed description thereof will be omitted.

This embodiment differs from the embodiment shown in FIG. 1 in that a vibration isolator 40 is provided between the vertical shaft pump 10 and the inner wall (side wall and bottom surface) of the water tank 55 instead of installing the vibration isolator 35. Is a point connected by

Here, the vibration isolating member 40 is constituted by a rod member, and a dash pot 43 is attached in the middle thereof. Dash pot 43 absorbs (buffers) sudden vibration
A mechanism that moves slowly (moves slowly in the axial direction, but generates a greater resistance as it moves more rapidly, that is, a mechanism that generates damping force in proportion to the vibration speed), such as a hydraulic mechanism It is constituted by. Further, a turnbuckle 44 for adjusting the length of the vibration isolating member 40 is attached in the middle of the vibration isolating member 40. Both ends of the vibration isolating member 40 are attached to the vertical shaft pump 10 and the water tank 55 by rotatable connecting means 47, 47.

In FIG. 2, the vibration isolator 40 is shown only at one position between the bottom of the vertical pump 10 and the water tank 55 and at one position between the side walls of the vertical pump 10 and the water tank 55. There are three places in the circumferential direction between the bottom surfaces, and three places in the circumferential direction between the vertical pump 10 and the side wall of the water tank 55.

FIG. 3 is a view showing a mounting state of the vibration isolating member 40 mounted between the vertical shaft pump 10 and the side wall of the water tank 55. As shown in the drawing, in this embodiment, three vibration isolating members 40 are installed in the circumferential direction.
Is preferably in the range of θ = 20 ° to 70 °. Note that the vibration isolating members 40 on both sides may be omitted and only the central vibration isolating member 40 may be attached. Alternatively, the central anti-vibration member 40 may be omitted and only the anti-vibration members 40 on both sides may be attached. That is, the number and position where the vibration isolating members 40 are attached can be variously changed as necessary.

When the vertical pump 10 is operated as a preceding standby pump to perform an in-air operation or a gas-water mixing operation, larger vibrations are likely to occur than in the case of a steady operation. The anti-vibration member 40 is connected between the water tanks 55, and
Does not follow fast movements such as pump vibrations, so that the entire vibration isolating member 40 acts as a rigid body, so that the vibrations can be reliably suppressed by the vibration isolating member 40 connected to the water tank 55.

On the other hand, even if subsidence occurs on the ground on which the vertical pump 10 is installed, and the relative position between the water tank 55 and the vertical pump 10 changes little by little, such a slow change will not occur. Since the dash pot 43 expands and contracts without resistance, no extra force is transmitted to the vertical shaft pump 10 from the vibration isolating member 40 side.

When the relative position between the water tank 55 and the vertical pump 10 changes little by little, the mounting angle between the vibration isolator 40 and the vertical pump 10 to which it is attached and the water tank 55 also change little by little. Since the rotatable connection means 47 is attached to both ends of 40, the attachment angle can be changed without resistance.

Although a rigid rod member is used as the vibration isolating member 40 in the above embodiment, a plate-like member, an L-shaped steel, or the like may be used.
It may be composed of members having other various shapes and structures.

In the above embodiment, a turnbuckle is used as the length adjusting means for adjusting the length of the vibration isolating member 40. However, other various length adjusting means may be used.

The anti-sway device according to the present invention is suitable for use in a preceding standby pump as in the above embodiment,
It goes without saying that the present invention is similarly effective when used for a pump that performs ordinary steady operation.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims and the technical idea described in the specification and the drawings. Is possible. It should be noted that any shape or structure not directly described in the specification and the drawings is within the technical idea of the present invention as long as the effects and effects of the present invention are exhibited. For example, the driving means of the vertical pump 10 is not limited to an electric motor, but may be another driving means such as an engine or a turbine. The inner wall of the water tank 55 to which the vibration isolating member 40 is attached may be the upper surface of the water tank 55 (the lower surface of the floor 51).

[0031]

As described in detail above, the present invention has the following excellent effects. An anti-vibration damper that absorbs the vibration of the vertical pump is installed between the vertical pump and the water tank, and the vibration isolator is connected to either the water tank or the vertical pump via sliding means, preventing vibration of the vertical pump. As well as being able to easily follow even if land subsidence occurs, it does not transmit extra force to the pump.

Since the vertical shaft pump and the inner wall of the water tank are connected by a vibration isolating member and a dash pot is attached to the vibration isolating member, vibration of the vertical shaft pump can be prevented, and even if subsidence occurs, It can easily follow and does not transfer extra power to the pump.

Since both ends of the vibration isolating member are connected between the vertical pump and the inner wall of the water tank by rotatable connecting means, even if the relative position between the water tank and the vertical pump changes, the vertical pump or the water tank of the vibration isolating member changes. It is possible to change the mounting angle to the device without resistance.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a vertical shaft pump using one embodiment of the present invention and an anti-swing device thereof.

FIG. 2 is a schematic side view showing a vertical shaft pump using another embodiment of the present invention and its anti-swing device.

FIG. 3 is a diagram showing a mounting state of a vibration isolating member 40 mounted between the vertical shaft pump 10 and a side wall of the water tank 55.

FIG. 4 is a schematic side view showing a conventional vertical pump and its anti-swing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vertical shaft pump 11 Opening 13 Pump base plate 15 Electric motor base 17 Electric motor 19 Discharge curved pipe 21 Hanging pipe 23 Discharge bowl 25 Suction bellmouth 27 Rectifier plate mounting member 29 Rectifier plate 31 Discharge pipe 35 Vibration damper 37 Vibration damper support member 37a Cylinder part 39 Dust seal 40 Anti-vibration member 43 Dash pot 44 Turnbuckle (length adjusting means) 47 Connecting means 51 Floor 55 Water tank

Claims (4)

[Claims] 1. An anti-swing device for a vertical shaft pump which prevents a vertical shaft pump from hanging from a floor into a water tank, wherein the anti-sway device is provided between a lower portion of the vertical shaft pump and a bottom surface of the water tank. An anti-vibration device for a vertical shaft pump, wherein a vibration isolator damper for absorbing vibration is attached, and the vibration isolator damper is connected to one of the water tank and the vertical shaft pump via slide means. 2. An anti-swing device for a vertical shaft pump suspended in a water tank from the floor, wherein the anti-sway device is connected between the vertical pump and an inner wall of the water tank by a vibration isolating member. And a dash pot for generating a damping force in proportion to a vibration speed is attached to the vibration isolating member. 3. The device according to claim 2, wherein both ends of the vibration isolator are connected between the vertical pump and the inner wall of the water tank by rotatable connecting means. 4. The anti-vibration device for a vertical shaft pump according to claim 2, wherein a length adjusting means for adjusting a length of the anti-vibration member is attached to the anti-vibration member.