JPS5928157Y2 - Vertical pump drive machine rigidity adjustment device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for adjusting the rigidity of the driving machine stand of a spindle pump, and its purpose is to easily adjust the rigidity of the stand when installing the spindle pump on site, This is an attempt to solve the vibration problem of shaft pumps above ground.

The occurrence of vibration in a spindle pump is caused by the rotation speed caused by the unbalance of the rotating body and the above-ground part including the installation foundation (pump support stand, drive unit, its stand, etc.) or the underground part (pumping pipes, etc.).
This is largely due to the so-called resonance phenomenon in which the natural frequencies of the air intakes (intake ports, etc.) match.

Since this frequency is generally higher in the above-ground part, the present invention attempts to prevent resonance by changing the rigidity of the drive machine stand in the above-ground part in particular.

Conventionally, in order to avoid this resonance, the natural frequency has been calculated in advance, but various basic conditions, the influence of connecting the discharge nozzle to external piping, and manufacturing errors in the above-ground part must be accurately calculated. This is nearly impossible, and the attempt cannot be said to have been successful.

In addition, in order to reliably avoid this resonance, it is possible to design the above-ground or underground parts to be rigid, but it is not possible to design a rigid body for the platform that supports the dynamic load and starting torque of the drive machine. It is uneconomical, and if a soft structure is used, it is insufficient to support the weight of the drive machine and the starting torque. Attempts to do so are economically unfeasible.

As described above, the problem of vibration of the spindle pump has not been solved at the design stage, nor has it been solved in factory tests.

This is because the foundation or installation conditions subjected to factory testing are different from those in the field.

Therefore, if the spindle pump resonates during trial operation after being installed on site, it is necessary to repair it, and the target of the repair is the above-ground part, especially the drive machine stand.

When the drive platform is modified to make it softer, the ribs are cut or windows are opened in the body, and conversely, when it is modified to be more rigid, the ribs are assisted.

However, since these modifications involve fusing or welding, thermal distortion is inevitable, and the precision of the drive machine base is unavoidable.In the end, the drive machine base must be removed using a tow truck or crane. After removing it and inspecting its dimensions, we either rework it or replace it with a new one.

As mentioned above, conventional vibration solutions have the disadvantage of being costly and time consuming.

The present invention aims to provide a rigidity adjustment device for a drive machine stand that does not have such drawbacks, and according to the present invention, it is possible to modify the drive machine stand to make it stiffer or to make it softer. This is easily achieved by attaching or removing the stays with a nand to the rigging.

Embodiments of the present invention will be described below with reference to the drawings. Referring to FIG. 1, a pumping pipe 3 having a pump main body 2 at its tip is inserted into the opening of a pump base 1, and a pump support 6 having a discharge port 5 is attached to the base via a base 4 in the usual manner. It is installed by the method.

A drive machine 8 is installed on the pump support base 6 to sandwich the drive machine base 7 and drive the impeller.

The spindle pump 9, which is shown in its entirety in the same figure, has a drive unit 7.
The rest is of a conventionally known type, and the method of installing it on the foundation 1 is not particularly new.

As mentioned above, the members that resonate with the vibrations caused by the unbalance of the rotating body are the underground part consisting of the water pump 3, the pump body 2, etc., or the drive machine 8, drive machine stand 7, and pump support stand 6.
However, the above ground part has a much higher frequency of occurrence, and the drive machine base is superior in terms of ease of adjusting the rigidity, so in this invention, the drive machine base is selected, and the rigidity of the rigging is adjusted. is used to prevent resonance.

Referring to FIGS. 2a and 2, which show details of the driving machine mount 7, the driving machine mount includes a body part 10 and flanges attached to the upper and lower ends of the body part by appropriate means such as welding. 1
2.13 and the plurality of stay attachments attached to the outer periphery of the seven langes is understood to be mainly composed of the metal fittings 19.

The flange 13 is attached to the pump support base 6 by bolts 18 or the like.
The drive unit 8 is similarly fixed to the flanges 12 and 13.

For mounting the stay, the metal fitting 19 is composed of a mounting plate 14 which has a notch 16 so that the stay 17 can be inserted in the radial direction (indicated by arrow A), and a rib plate 15, and the rib plate is attached to the flange 12.13. has a height H that allows the nand 20 to be inserted between it and the plate 14, and these drawing plates are integrally attached to the flange 12.13 and the body part 10 by means such as welding or bolt nands. .

In this stay installation, a plurality of metal fittings are attached to the outer circumference of the flange vertically facing each other.

Reference numeral 11 in the figure is a window hole provided in the maintenance upper body section 10.

In the first embodiment of the present invention, the stay 17 is attached to or removed from the metal fitting 19 as required.
As shown in the figure, it is composed of a rod-shaped body such as a steel pipe or a round bar, and its length is approximately equal to the length of the body section 10, and a pair of oaks 20 and 21 are attached to the end of the vehicle. A thread is formed to be screwed together.

Since the present invention is constructed as described above, the operation and effect thereof will be explained. After the pump is installed in the state shown in FIG. 1, a test run is performed.

If there is no resonance and no vibration occurs in the pump, you can start the actual operation as is, but if the unique frequency is close to the frequency of the rotating body and resonance occurs, adjust the stay 17 prepared in advance properly. Install the stay at the metal fitting 19)
20. Install or remove in 21, change the configuration of the drive machine, change the natural frequency of the above-ground part of the spindle pump,
Resonance can be suppressed.

In this case, if the entire pump device is viewed as one vibration system,
The natural frequency of the entire pump system will change.

Note that when installing the stay, it is possible to install the stay without causing distortion between the flanges by adjusting the positions of the nuts 20 and 21.

According to the present invention, as described above, the drive machine has the effect that the natural frequency can be changed by the simple operation of attaching or detaching the stay without removing the drive base.

In addition, when the drive unit according to the present invention is used in a spindle pump that has a standardized component configuration, two types of temporary cross-sections of the drive unit are available, with and without stays attached in each direction. The next moment can be determined experimentally, and during actual installation, it is possible to use that value to modify the unique frequency with higher accuracy based on the unique frequency of the condition. .

Other embodiments of the stay are shown in FIGS. 3a and 3s and 4a and 4s.

Since the members other than the stay are the same as those described above, only the stay will be explained.The stay 30 shown in FIGS. 3a and 3b has a flat plate 31 welded to the body part with bolts 32. .

In this embodiment, the structure is arbitrary as long as the middle part of the stay is bolted to the body, so the flat plate 31 is not necessarily necessary, and holes are drilled in the stay and bolted directly to the body. It may be installed.

In the embodiment shown in FIGS. 4a and 4b, the stay 40 is made of angle iron, threaded rods 42, 42 are welded to both ends of the stay 40, and one side 41 of the angle iron is fixed to the body with a bolt 43. It has become.

[Brief explanation of the drawing]

Fig. 1 is an overall view showing the installed state of the spindle pump, Fig. 2 a is an enlarged detailed front view of the drive machine stand, and Fig. 2 is a view taken from arrow 2-2 in Fig. 2. The partially omitted plan view, FIGS. 3 and 4 are views showing other embodiments of the stay attached to the driving machine, respectively, and FIGS. 3a and 4a are respectively the views shown in FIG. , and FIGS. 3 and 4 are views corresponding to FIG. 2, respectively. Explanation of main symbols in the drawings: 6... Pump support stand, 7... Drive machine stand, 8... Drive machine, 1
0...Body part, 12.13...Flange, 14...Mounting plate, 16...Notch,
17... Stay, 19... Stay installation with metal fittings, 20, 21... Nando, 31...
・・Flat plate, 40・・Angle iron (stay), 42・
...Threaded rod.

Claims (4)

[Scope of utility model registration request] (1) In a drive platform rigidity adjustment device for a spindle pump, which includes a drive machine that drives an impeller, a drive machine base that supports the drive machine, and a pump support base that supports the pump body,
The drive machine stand includes a body part, flanges provided at the upper and lower ends of the body part and connected to the drive machine and the pump support stand, respectively; The stay mounting has a plate with a notch formed so that the stay can be inserted in the radial direction. The stay can be installed and removed freely, and by increasing or decreasing the stay attached to the metal fittings, the natural frequency of the spindle pump can be modified by adjusting the stiffness and softening without deforming the drive machine base. A drive machine stand rigidity adjustment device for a spindle pump, characterized by the following. (2) The single-drive machine rigidity adjustment device for a spindle pump as set forth in claim 1 of the utility model registration claim, wherein the stay is made of a steel pipe or a rod-like body such as a round bar. (3) The stay attachment is the first claim of the utility model registration in which the stay attached to the metal fitting is also screwed to the body part.
A device for adjusting the rigidity of the drive machine base of the spindle pump described in Section 1. (4) The spindle pump according to item 1 of the utility model registration claim, wherein the stay is made of angle iron with threaded rods welded to both ends, and the edges of the angle iron are also screwed to the body. Drive machine rigidity adjustment device.