JPS6142995Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration-isolating support device that supports and isolates rotating equipment such as vertical pumps, blowers, compressors, turbines, engines, and motors.

Conventionally, the above-mentioned vertical arrangement structure of rotating equipment has been arranged in a vertically elongated manner as shown in FIG.
For example, a support device c consisting of a substrate a, a support stand b, etc.
Since the heavy motor d is supported on the upper side and the pump e is supported on the lower side, it is difficult to increase the rigidity of the support device c, and the natural frequency of the support device c is high due to the heavy motor d. However, as shown in Figure 2, the amplitude peak of the natural frequency B of the entire device such as a pump may be located near or within the operating speed range A of the pump e, and a small excitation force may cause a large The problem is that the vibration amplitude becomes large during operation of the pump e, which often causes problems in terms of vibration isolation.

In order to avoid the above-mentioned difficulties, as shown in Fig. 2, the rigidity of the substrate a, the support stand b, the support device c such as the pump casing is increased, and the natural frequency of the whole device is set to the amplitude peak h'. By lowering the rigidity of the above-mentioned support device c and the means for removing it above (to the right) than the operating speed range a of the pump e, the natural frequency of the entire device is set to the natural frequency of the entire device, and its amplitude peak n' is set to the pump e.
There is a means to remove the pump e below (on the left side) than the operating speed range A, but the former method results in a significant increase in cost and weight, and the latter means that the amplitude within the operating speed range A of the pump e is However, since the amplitude peak ni' of the natural frequency d is high, a large amplitude peak is reached when the rotational speed of the pump e increases or decreases, and the amplitude increases due to irregular excitation force.

The present invention relates to a device to solve the above-mentioned difficulties in the conventional support devices for rotating equipment, and its purpose is to control the amplitude of the entire device in the operating rotational speed range of rotating equipment and its rotation increase and decrease. The purpose of the present invention is to provide a vibration isolating support device for rotating equipment that significantly reduces the amplitude of The inner periphery of the gap is closely connected, the outer periphery is sealed with a flexible material such as an O-ring inserted between the outer peripheries, and viscous fluid is filled between the upper and lower disc springs. It is characterized by the provision of a thin, flat, annular sealed chamber.

Since the present invention has the above-mentioned configuration, the upper and lower disc springs are interposed between the support device and the rotating equipment, and the thin flat annular sealed chamber filled with viscous fluid such as oil is formed between the upper and lower disc springs. Due to the structure, the upper and lower disc springs ensure a suitable spring constant for vertical and tilting vibrations, effectively damping vibrations in these directions, and the excitation force acting in the horizontal direction is absorbed by the vibration in the annular sealed chamber. A vibration damping effect is obtained by the squeeze film damper action absorbed by the shear resistance of the viscous fluid, and furthermore,
This results in a substantial reduction in the rigidity of the support device, and the natural frequency and amplitude of the entire device are significantly reduced, and the amplitude peak also becomes significantly smaller and out of the operating speed range, making it difficult to operate during operation, start-up, and stop. A remarkable vibration-proofing effect can be obtained when the rotation increases or decreases. Furthermore, the response to irregular excitation forces does not become large.

Furthermore, the present invention is a compact device with an extremely simple structure, and there is no need to increase the height of the device by installing it, and the above-mentioned effective vibration isolation effect can be obtained at low cost. It is practical and versatile, and is also an effective means of earthquake countermeasures.

An embodiment of the present invention will be described below with reference to FIG.
In the figure, b denotes a support stand, and d denotes a motor that drives the illustrated pump via the drive shaft 1, and a vibration-proof support device f is interposed between the support stand b and the motor d. The vibration isolating support device f consists of upper and lower disc springs 3, 3 having a center hole 2 into which the drive shaft 1 is inserted, and a minute interval is formed between the overlapping surfaces of the upper and lower disc springs 3, 3. The inner peripheral edges of the upper and lower disc springs 3, 3 are brought into close contact with each other and connected by bolts 10, etc., and the outer peripheral edges of the upper and lower disc springs 3, 3 are sealed by a flexible material such as an O-ring 5, etc. The inside and outside of the minute gap are sealed, and the inside thereof is filled with a viscous fluid such as oil to form a thin flat annular sealed chamber 4. Furthermore, on the right side of the upper disc spring 3, there is provided an annular sealed chamber 4. A viscous fluid such as oil is filled in the annular sealed chamber 4 by a lubrication mechanism consisting of a provided lubrication pipe 6, a valve 7, and an oil tank 8, and the annular sealed chamber 4 is located on the left side of the upper disc spring 3. A motor d is connected to the upper circumferential surface of the upper disk spring 3 with bolts 11, etc., and a bolt 12 is connected to the lower circumferential surface of the lower disk spring 3.
It has a structure in which it is connected to the support base b by means of etc.

Since the embodiment of the present invention has the above-described structure, the annular sealed chamber 4 can be opened and closed by opening and closing the valve 7.
When a suitable amount of viscous fluid such as oil is filled in the inside and the motor d is operated to drive the pump supported below (not shown) through the drive shaft 1, the vertical and tilting vibrations of the pump and motor d will be , upper and lower disks 3,
3, and the excitation force acting in the horizontal direction on the motor d side with respect to the support base b is attenuated by the squeeze film damper action, which is absorbed by the shear resistance of the viscous fluid in the annular chamber. The natural frequency becomes the natural frequency E shown in Fig. 2, and the amplitude is greatly reduced.Furthermore, the rigidity of the support base b is substantially lowered by the action of the vibration isolating support device f. As a result, the amplitude peak H' of the natural frequency E deviates from the operating speed range A below (to the left) and becomes significantly smaller. Therefore, according to the embodiment, a vibration damping effect with a significantly reduced amplitude can be obtained even within the operating rotational speed range A, that is, during operation, when starting and stopping the operation, that is, when increasing and decreasing the rotation. Further, the response to the excitation force, that is, the change in amplitude is also reduced.

In addition, the natural frequency of the entire device can be adjusted appropriately by designing the dimensions of the upper and lower disc springs 3, 3, that is, the thickness, inner diameter, and outer diameter, and also by adjusting the gap and area of the annular sealed chamber 4. By adjusting the viscosity of the viscous fluid such as oil to be filled, it is possible to achieve the best vibration damping effect.

Furthermore, the above-mentioned anti-vibration support device f has a simple and compact structure, and there is no need to increase the height by interposing it on the support base.
It has the advantage of vibration isolation, is practical and versatile as it can be easily installed at low cost, and is also effective as an earthquake countermeasure.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an outline of a conventional vertical arrangement of rotating equipment, FIG. 2 is an explanatory diagram of the operation, and FIG. 3 is a longitudinal sectional side view showing an embodiment of the present invention. a: Substrate, b: Support stand, c: Support device, d: Motor, e: Pump, f: Vibration isolating support device, 1: Drive shaft, 3: Upper and lower disc springs, 4: Annular sealed chamber, 5: Possible Flexible material, 6: Oil supply piping, 7: Valve, 8: Oil tank, 10, 11, 12: Bolts.

Claims (1)

[Scope of utility model registration request] The inner periphery of the minute gap formed between the overlapping surfaces of the upper and lower disc springs having a center hole is closely connected, and the outer periphery is connected by a flexible material such as an O-ring interposed between the outer peripheries. A thin flat annular sealed chamber filled with a viscous fluid is provided between the upper and lower disc springs by sealing the space between the upper and lower disc springs. Anti-vibration support device for rotating equipment that supports and isolates vibration.