JPH0571576A - Vibration controller for piping system and equipment - Google Patents

Abstract

PURPOSE:To improve the durability and reliability of a piping system and equipment by effectively absorbing the fine vibration by installing a damper control means for controlling the viscosity of an electric working fluid by the signal supplied from a vibratior detecting sensor. CONSTITUTION:When the reduction of reliability is generated in atomic power pipe and a device 14, a reliability detection sensor 3 detects this fact, and a signal is inputted into a damper control means 4. The damper control means 4 recognizes the position of the atomic power pipe and the device 14 for which the reduction of reliability generates, and controls a transformer 20 which supplies voltage to an ER damper 2. The transformer 20 applies a proper voltage to the electrode 19 of the ER damper 2 by the signal supplied from the damper control means 4, and damping force of the ER damper 2 is adjusted by arbitrarily varying the viscosity of the electronic operation fluid positioned between the electrode 19, and this fine vibration is absorbed. Accordingly, the abnormal noise generated by the fine vibration and the metallic fatigue applied to a connection part can be suppressed by effectively suppressing the fine vibration which can not be absorbed by an oil damper 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports pipes such as cooling water pipes attached to a nuclear power plant and equipment such as circulation pumps, and pipes for effectively absorbing vibrations generated by these. The present invention relates to a vibration control device for systems and equipment.

[0002]

2. Description of the Related Art Conventionally, for example, a nuclear power plant is equipped with equipment such as a cooling water pipe and a cooling water circulation pump for circulating primary cooling water. For example, as shown in FIG.
The cooling water circulation pump a is provided with a motor part c for circulating the cooling water in the pump casing b, and the output is variable according to the circulation amount of the circulating cooling water. Further, as shown in the figure, the cooling water circulation pump a is supported by a plurality of hangers d fixed to a fixed system so as to be suspended in a hollow state, and the lower portion thereof extends horizontally from the fixed system. It is supported so as not to swing by the plurality of jet straddles e. Further, the cooling water circulation pump a is fixedly supported together with the hanger d and the jet straddle e by a plurality of mechanical snappers f having one end fixed to a fixed system.

This mechanical snapper f has a function of suppressing abrupt movement of equipment such as a cooling water pipe and a cooling water circulation pump due to an earthquake or the like, and a flywheel g is fixed to an end thereof as shown in FIG. And a snapper body i having a ball screw h rotatably provided therein, and the snapper body i.
It is mainly composed of a piston j slidably provided at the end of the. When a sudden movement of the cooling water pipes and equipment caused by an earthquake or fluctuation of pump output enters the load column 1 via the spherical bearing k of the piston j, the linear movement of the ball nut m causes the rotational movement of the ball screw h. The flywheel g is rotated by the rotation of the ball screw h, and the rotation delay between the flywheel g and the disc spring n fixed to the end portion of the ball screw h is used to cause a braking action to stop the rotation of the ball screw h. Therefore, the brake is activated to stop the sudden linear movement. However, the brake does not operate with respect to the gentle linear movement, and the resistance force hardly occurs.

In other words, this mechanical snapper f receives vibrations and loads when abrupt movements of equipment such as cooling water piping and cooling water circulation pump due to an earthquake or the like act to damage the equipment due to vibrations. In addition to preventing this, the movement of the equipment, which has become highly heated due to the rise of the cooling water, due to the thermal expansion is followed and allowed.

[0005]

By the way, since the mechanical snapper f has some mechanical play, it is impossible to absorb a minute vibration having an amplitude of about 0.1 to 1 mm width. .. Therefore, various problems occur such that abnormal noise is generated due to this slight vibration, and metallic fatigue is given to the connecting portions of the devices. Also, as an alternative to the mechanical snapper f, it is possible to use an oil damper, a dynamic vibration absorber, or the like, but these are effective only for a certain specific frequency, and they are effective for load fluctuations like nuclear power pipes. It was not always effective for those whose frequency changed.

Therefore, the present invention has been devised to effectively solve this problem, and its main purpose is to provide minute vibrations that cannot be absorbed by conventional support devices such as mechanical snappers and dynamic vibration absorbers. The present invention provides a vibration control device for a piping system and equipment, which effectively improves the durability and reliability of the piping system and equipment.

[0007]

In order to achieve the above object, the present invention supports a piping system and equipment on a fixed system through an oil damper, a mechanical snapper, etc., and at the same time, generates the piping system and equipment. In a vibration control device for piping systems and equipment for damping microvibration, the damping force is controlled by an electric working fluid that is connected in series with the oil damper or mechanical snapper and whose viscosity changes in proportion to the voltage. ER damper, a vibration detection sensor for detecting a slight vibration of the piping system and devices, and a damper control means for controlling the viscosity of the electric working fluid by a signal from the vibration detection sensor.

[0008]

Since the present invention is configured as described above,
When abrupt vibration due to an earthquake or resonance occurs in the piping system and equipment, the oil damper or mechanical snapper operates to damp this vibration. Also, when the piping system and equipment thermally expand due to high-temperature cooling water, the oil damper or mechanical snapper does not suddenly operate and follows the movement due to the thermal expansion. Also, no excessive stress is applied to the equipment. On the other hand, when a slight vibration that cannot be absorbed by the oil damper or mechanical snapper occurs in the piping system and devices, the vibration detection sensor senses this and inputs a signal to the damper control means. Then, the voltage applied to the ER damper is changed by the damper control means, and the viscosity of the electric working fluid in the ER damper is changed, whereby the ER damper is changed to the optimum damping force necessary for absorbing the slight vibration, Micro vibrations will be effectively suppressed. In other words, the oil damper or mechanical snapper operates in response to a sudden vibration generated from the piping system and equipment and a gradual movement due to thermal expansion, and the oil damper or mechanical snapper cannot absorb it. The ER damper operates to absorb the slight vibration.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to a circulating piping system for primary cooling water in a nuclear power plant.

As shown in FIG. 1, the vibration control apparatus for a piping system and devices according to the present invention has an oil damper 1 whose one end is swingably fixed to a fixed system, and the other end of the oil damper 1 connected in series. An ER damper 2 that is connected and has a variable damping force, and a vibration detection sensor 3 that detects a micro-vibration of nuclear power piping and equipment 14.
And the signal from the vibration detection sensor 3 causes the ER
It is mainly composed of a damper control means 4 for controlling the damper 2. The oil damper 1 and the ER damper 2 are integrally formed, and are provided in plural and in a set at predetermined positions of the nuclear power piping and the equipment 14 together with the vibration detection sensor 3, and these are set by the damper control means 4. Controlled.

The oil damper 1 is a typical cylindrical damper that has been used for various things in the past, and as shown in the figure, its structure is a cylinder 5 having a liquid reservoir chamber 6,
A piston 7 that is reciprocally movable in the cylinder 5.
Has been mainly from. Further, the partition portion 8 between the cylinder 5 and the liquid storage chamber 6 has a communication hole 9 and an orifice 11 having a valve 10.
Is formed, and the oil flows between the cylinder 5 and the liquid reservoir 6 in one direction. Further, the end portion of the cylinder 5 located below the communication hole 9 and the piston 7 are formed with communication holes 12 and 13 for allowing oil to respectively pass therethrough, and further, these communication holes 12 and 13 are respectively formed.
Valves 12a and 13a for restricting the direction of oil flow are provided. That is, when the piston 7 moves to the right (pulls), the oil damper 1 closes the valve 13a and opens the valve 12a, and the oil pushed by the piston 7 is ejected from the orifice 11 equipped with the valve 10 to the liquid storage chamber 6 side. Then
It resists the movement of the piston 7. When the piston 7 moves to the left, the valve valve 13a is opened and the valve 12a is closed. Therefore, the piston 7 of the oil damper 1 exhibits a high resistance to a sudden stroke and allows a gentle stroke.

On the other hand, as shown in the figure, the ER damper 2 connected in series with the oil damper 1 has a cylindrical ER whose one end is swingably fixed to the nuclear power piping and the equipment 14.
A cylinder 15 and a piston 7 of the oil damper 1 are connected to each other, and mainly include an ER cylinder 15 and an ER piston 16 which is slidable. The outer diameter of the ER piston 16 is smaller than the inner diameter of the ER cylinder 15, and a cylindrical gap K is formed between them. The gap K is provided above and below the inner wall of the ER cylinder 15. It is formed in a hermetically sealed state by the pair of piston rings 17 provided. The gap K is filled with an electric working fluid (ERF), and is supplied from the ER liquid storage chamber 18 in the ER piston 16 at any time. Further, an electrode 19 connected to the transformer 20 of the damper control means 4 is provided on the outer peripheral surface of the ER piston 16 and the inner peripheral surface of the ER cylinder 15, and an electric working fluid (ER) located in the gap K is provided.
The voltage required for F) is applied. As is well known in the art, the electric working fluid (ERF) has a characteristic that its viscosity changes in proportion to an applied voltage. Therefore, the characteristic is used to start a damper, an engine mount, a clutch. Attempts are being made to apply to many fields.

That is, the ER damper 2 utilizes the change in frictional force due to the change in viscosity of the electric working fluid (ERF) located in the gap K due to the voltage applied from the electrode 19, and the ER piston 16 The resistance force during the stroke can be controlled arbitrarily. Reference numeral 21 in the drawing is a spring for adjusting the position of the ER piston 16 to the standard state.

The damper control means 4 is, for example, a neurocomputer that replaces an existing computer and simulates a neural network of a living being, and is input from the vibration detection sensors 3 provided in a large number in nuclear power lines and equipments 14. The ER damper 2 at the position where the nuclear power piping and the equipments 14 which generate slight vibrations are fixedly supported by the signal is controlled.

Next, the operation of the present invention will be described.

As shown in FIG. 1, when an abrupt vibration impact due to an earthquake or resonance occurs in the nuclear power piping and equipment 14,
This vibration is transmitted to the oil damper 1 via the ER damper 2. Then, the oil damper 1 operates against this vibration, exhibits a strong resistance to the sudden vibration and impact of the nuclear power piping and the equipment 14, and attenuates this. However, when the nuclear piping and the equipment 14 are gradually thermally expanded by the high-heat cooling water, the piston 7 of the oil damper 1 is gently moved in the compression direction following this, and this linear movement is allowed. As a result, unnecessary stress is not applied to the nuclear power piping and the equipment 14. On the contrary, when the nuclear piping and the equipment 14 are gradually thermally contracted, the piston 7 of the oil damper 1 is gently moved in the pulling direction to follow the thermal expansion, and the linear movement is allowed. However, no unnecessary stress is applied to the nuclear piping and the equipment 14.

On the other hand, when a slight vibration having an amplitude of about 0.1 to 1 mm occurs in the nuclear power piping and equipment 14, the vibration detection sensor 3 provided in the vicinity of the nuclear power piping and equipment 14 detects it. , This signal is input to the damper control means 4. The damper control means 4 recognizes the positions of the nuclear power piping and the equipments 14 where the slight vibration is generated, and controls the transformer 20 which supplies the voltage to the ER damper 2 supporting the vicinity. Then, the transformer 20 outputs an appropriate voltage according to the signal from the damper control means 4 to the ER damper 2
In addition to the electrodes 19, the viscosity of the electronic working fluid located between the electrodes 19 is arbitrarily changed to adjust the damping force of the ER damper 2 and absorb the minute vibration. That is, normally, a high voltage is applied from the transformer 20 to the ER damper 2 to increase the viscosity of the electronic working fluid and the damping force thereof is set high. However, when a slight vibration occurs, damper control is performed. The means 4 lowers the voltage applied from the transformer 20 to the ER damper 2 to lower the damping force of the ER damper 2 to absorb the minute vibration.

That is, in the vibration control device of the present invention, the oil damper 1 operates in response to a sudden vibration generated from the nuclear power piping and the equipment 14 and a gradual movement due to thermal expansion. The ER damper 2 operates to absorb the minute vibration that cannot be absorbed by the oil damper 1.

As described above, according to the present invention, the slight vibration which cannot be suppressed only by the conventional mechanical snapper is ER.
Since it is possible to effectively suppress the noise by using the damper, it is possible to prevent abnormal noise due to microvibration and metallic fatigue of the connecting portion.

In this embodiment, the oil damper 1 and the ER damper 2 are combined and connected. However, instead of the oil damper 1, a mechanical snapper which has been conventionally used may be combined with the above. It is possible to obtain the same effect.

Further, in the present embodiment, an example in which it is used for nuclear power piping and its equipment has been described. However, the present invention is not limited to this and can be widely applied to other piping and equipment that generate vibration. Is.

[0022]

In summary, according to the present invention, it is possible to effectively suppress the minute vibration that could not be suppressed by the conventional mechanical snapper alone. It is possible to prevent mechanical fatigue, and it has an excellent effect of dramatically improving the durability and reliability of the piping system and equipment.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a conventional supporting structure for a piping system and devices.

FIG. 3 is a schematic cross-sectional view showing the structure of a mechanical snapper.

[Explanation of symbols]

 1 Oil Damper 2 ER Damper 3 Vibration Detection Sensor 4 Damper Control Means 14 Piping Systems and Equipment ERF Electric Working Fluid

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F16L 3/215 G05D 19/02 D 8811-3H G21D 1/00

Claims (1)

[Claims] 1. A pipe system and equipment for supporting a pipe system and equipment on a fixed system via an oil damper, a mechanical snapper, etc., and for damping microvibration generated in the pipe system and equipment. In a vibration control device, an ER damper, which is connected in series with the oil damper or mechanical snapper and whose damping force is controlled by an electric working fluid whose viscosity changes in proportion to a voltage, and a slight vibration of the piping system and devices. A vibration control device for nuclear power pipes and equipment, comprising: a vibration detection sensor for detecting the vibration of the nuclear power supply; and a damper control means for controlling the viscosity of the electric working fluid by a signal from the vibration detection sensor.