JP2002267046A - Vibration isolating device, and facility having pipe or duct supported thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive and maintenance-free vibration isolating device capable of reducing the vibration of vibrating body with an excitation force (dynamic displacement) applied thereto but non-resistant against the thermal expansion displacement due to temperature change (static displacement), and a facility having a pipe or a duct supported thereby. SOLUTION: This vibration isolating device for reducing the vibration of the vibrating body with the excitation force applied thereto comprises a supporting member for movably supporting the vibrating body in the direction of the thermal expansion displacement, and an inertial mass body with an inertia force against the excitation force applied thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for reducing the vibration of a vibrating body to which an exciting force acts. The present invention relates to a vibration damping device applied to equipment (e.g., various plants for power generation, chemical, incineration, etc., air conditioners, etc.) provided with a pipeline or a duct that receives vibration (shock) such as the above.

[0002]

2. Description of the Related Art Temperature changes when starting and stopping various plants and air conditioners such as power generation, chemical and incineration, and vibrations (shock) such as rotational vibration force and seismic load during operation.
For example, a mechanical snubber (or also referred to as “inertia damper”) 100 shown in FIG. 3 is a conventional vibration damping device that is applied to a facility including a pipeline or a duct that receives the fluid, and supports a pipe that configures the pipeline. There is.

The mechanical snubber 100 includes a bearing 102 fixed in a housing 101. Further, the support damper 104 is mounted on the housing 101 so as to be movable (in FIG. 3, it can be moved up and down). The support damper 104 has a ball nut 103 at one end (the lower end in FIG. 3). Further, a rotating inertial mass body 105 is provided in the housing 101.
One end of the rotating inertial mass body 105 is rotatably supported by the bearing 102. On the other hand, a ball screw 106 is provided at the other end of the rotary inertial mass body 105, and the ball screw 106 is screwed to a ball nut 103. The end a of the mechanical snubber 100 is attached to the fixed floor F so as to be able to swing through a fitting 107. Further, the end b of the mechanical snubber 100 is connected to the pipe P via a connecting member 108, and supports the pipe P.

With the above configuration, the mechanical snubber 1
00 operates as follows. Various plants and air conditioners receive shocking exciting force in the direction of arrow G (up and down direction in FIG. 3) due to rotational vibration force and earthquakes during operation, and the pipe P vibrates sharply vertically. When a dynamic displacement occurs), the support damper 104 connected to the pipe P moves (elevates) in the housing 101. This support damper 104
Is moved into a rotational motion of the ball screw 106 by a screw structure of the ball nut 103 and the ball screw 106, and the rotating inertial mass body 105 rapidly rotates at a high speed. Then, the rotational inertia force (swirl force) for maintaining the state before rotation acts on the support damper 104 as a resistance force (reaction force) to the excitation force, thereby damping the pipe P, that is, reducing the vibration. Will have an effect.

[0005] On the other hand, when thermal expansion displacement (static displacement) is gradually generated in the pipe P due to temperature change due to the start / stop of various plants or air conditioners, the rotary inertia mass body 105 is gradually released. Since the motor rotates at a low speed, no rotational inertia force (turning force) is generated. Therefore, the resistance (reaction force) to the thermal expansion displacement does not act on the pipe P, so that the pipe P continues to generate thermal expansion displacement while being freely supported.

[0006]

The conventional vibration damping device has a complicated internal structure like the above-mentioned mechanical snubber 100 and has a rotary inertia mass body for generating a stable and uniform rotary inertia force. 105 and ball nut 10
6. High machining accuracy is required for the ball screw 103. Therefore, the vibration damping device becomes extremely expensive. Further, in order to smoothly rotate the rotary inertia mass body 105, it is necessary to apply a lubricant that also serves as rust prevention between the ball nut 106 and the ball screw 103 that slide frequently, and this maintenance is complicated. There is also a problem that is.

[0007] In addition to the mechanical snubber 100,
Various dampers that absorb vibration energy, such as an oil damper using the fluid resistance of oil, have also been used as vibration damping devices. However, since it is necessary to construct a hydraulic system including a hydraulic control device, a hydraulic pump, and the like in addition to the oil damper alone, the vibration damping device becomes large and expensive. In addition, since oil is used, it is not preferable in terms of hygiene and safety, and maintenance such as measures against oil leakage is required.

In view of the above problems, the present invention reduces vibration of a vibrating body to which an exciting force (dynamic displacement) acts, and does not resist thermal expansion displacement (static displacement) due to temperature change. An object of the present invention is to provide an inexpensive and maintenance-free vibration damping device, and a facility provided with a pipeline or duct supported by the vibration damping device.

[0009]

An invention according to claim 1 is a vibration damping device for reducing vibration of a vibrating body to which an exciting force acts, wherein the vibrating body can be moved in a displacement direction of thermal expansion. , And an inertial mass body provided on the support member and acting on an inertial force that resists the excitation force.

In this vibration damping device, when an exciting force (dynamic displacement) acts on the vibrating body supported by the support member, an inertial force is generated in the inertial mass body provided on the support member. The inertial force acts as a resistance (reaction force) to the excitation force. Further, when a thermal expansion displacement (static displacement) due to a temperature change acts on the vibrating body, the vibrating body generates a thermal expansion displacement in a supported movable displacement direction. .

According to a second aspect of the present invention, in the vibration damping device according to the first aspect, the support member is provided so as to be swingable.

In this vibration damping device, even if the vibrating body is arranged at an arbitrary angle, the swingable support member is inclined according to the inclination angle of the vibrating body. The vibrating body is stably supported without depending on the arrangement state.

According to a third aspect of the present invention, in the vibration damping device according to the first or second aspect, the inertial mass body includes a support arm having one end fixed to the support member, And a weight fixed to the other end.

In this vibration damping device, since the weight is provided at the tip of the inertial mass, the center of gravity of the inertial mass is farther away from the vibrator. Therefore, a larger inertial force acts on the inertial mass body by the lever principle.

According to a fourth aspect of the present invention, in the vibration damping device according to the third aspect, a distance between the weight and the vibrating body is adjustable.

In this vibration damping device, the position of the center of gravity of the inertial mass body is changed by adjusting the distance between the weight body and the vibrating body, so that the magnitude of the inertial force acting on the inertial mass body is reduced. The natural frequency of the vibration damping device is arbitrarily changed.

According to a fifth aspect of the present invention, in the vibration damping device according to the third or fourth aspect, the weight is configured to be detachable from the support arm.

In this vibration damping device, since the weight is configured to be detachable from the support arm, the weight can be replaced with one having a different weight. Therefore, since the position of the center of gravity of the inertial mass body is changed, the magnitude of the inertial force acting on the inertial mass body and the natural frequency of the vibration damping device are arbitrarily changed.

According to a sixth aspect of the present invention, there is provided a facility provided with a pipeline or a duct, wherein the pipeline or the duct is supported by the vibration damping device according to any one of the first to fifth aspects. It is characterized by having been done.

According to a seventh aspect of the present invention, in the invention according to the sixth aspect, the equipment provided with the pipe or the duct comprises:
The air conditioner includes a refrigerant pipe through which the refrigerant flows.

According to an eighth aspect of the present invention, in the invention according to the sixth aspect, the equipment provided with the pipe or the duct comprises:
The plant is characterized by being a power plant, a chemical plant, an incineration plant or the like having a pipe or duct through which a fluid flows.

In a facility equipped with the pipeline or duct according to any one of claims 6 to 8, for example, in an air conditioner or various plants, the pipeline or duct is controlled by the vibration damping device according to claims 1 to 5. The duct is stably supported by a simple structure.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. The components having the same functions as those of the related art are denoted by the same reference numerals.

First, an embodiment of a vibration damping device according to the present invention will be described with reference to an air conditioner C having a refrigerant pipe P1 through which a refrigerant flows.
A description will be given using the vibration damping device 1 applied to the first embodiment. As shown in FIG. 1, the vibration damping device 1 includes a fixed plate 2 fixed to a fixed floor F by bolts 3. A support plate 5 is provided on the fixed plate 2 via a hinge 4 so as to be swingable in one direction (with the Y axis in FIG. 1 as a central axis). Note that a bent plate may be used instead of the hinge 4. This support plate 5 (support member) is composed of first rectangular plate portions 5 that are continuously arranged orthogonally to each other.
a (YZ plane in FIG. 1), second rectangular plate portion 5b
(XY plane in FIG. 1), third rectangular plate portion 5c (XZ plane in FIG. 1), and second rectangular plate portion 5b
And a third reinforcing plate 5d provided to connect the third rectangular plate portion 5c (FIG. 1).

The third rectangular plate portion 5 of the support plate 5
The inertial mass body 6 is attached to c. The inertial mass body 6 includes a support arm 6a having one end fixed to the third rectangular plate portion 5c, and a spherical weight 6b fixed to the other end of the support arm 6a. The weight 6b is detachably fixed to the support arm 6a so that the weight 6b can be replaced with one having a different weight. The inertial mass body 6 is fixed by bolts 7 so that the installation side of the weight body 6b is vertically upward (upward in FIG. 1). The support arm 6a is provided with a plurality of (three in FIG. 1) mounting holes 6c along its longitudinal direction, and the height from the weight body 6b to the support plate 5 is formed to be adjustable. .

On the upper surface of the second rectangular plate portion 5b, the refrigerant pipe (vibrating body) P1 can be moved only in the longitudinal direction (the X-axis direction in FIG. 1) by the pipe holder 8 (support member). It is supported by.

The vibration damping device 1 operates as follows with the above-described configuration. Dynamic excitation forces (dynamic displacements) Fx, Fy, Fz due to rotational vibration force or earthquake during operation of the air conditioner C1 are changed in the direction of arrows (X axis, Y axis,
When acting in the Z-axis direction, the refrigerant pipe p vibrates rapidly in the direction of action of the respective excitation forces (refrigerant pipe P1).
Dynamic displacement occurs). At this time, the inertial mass body 6 is also moved following the vibration direction of the refrigerant pipe P1. At the same time
The inertial forces fx, fy, and fz that try to maintain the state before each of the excitation forces Fx, Fy, and Fz act (or try to stay at the position before the action) are the actions of the respective excitation forces Fx, Fy, and Fz. It acts on the inertial mass 6 in a direction opposite to the direction. That is, the inertial forces fx, fy, and fz act on the inertial mass body 6 as resistances (reactions) to the respective excitation forces Fx, Fy, and Fz. Therefore, the refrigerant line P1 moving integrally with the inertial mass body 6
A vibration damping (vibration reduction) effect is exerted on the vibration.

On the other hand, when a thermal expansion displacement (static displacement) occurs in the refrigerant pipeline P1 due to a temperature change when the air conditioner C1 is started / stopped, the refrigerant pipeline P1 is moved longitudinally by the pipe retainer 8. Since it is supported so as to be movable only in the direction (X-axis direction in FIG. 1), the thermal expansion displacement Hx acts gently in the longitudinal direction. That is, no resistance to the thermal expansion displacement Hx acts on the refrigerant pipe P1, and the refrigerant pipe P1 can freely expand and contract in the longitudinal direction (continue to generate thermal displacement).

That is, according to the vibration damping device 1 of the present invention,
By using the inertial force acting on the inertial mass body 6 as a resistance to the exciting force (dynamic displacement) acting on the refrigerant pipe P1, the refrigerant pipe P1 can be damped (vibration reduced). . At the same time, the thermal expansion displacement (static displacement) with respect to the refrigerant pipe P1 due to the temperature change can be freely applied in the direction of the displacement, and the thermal expansion is absorbed.

In other words, the refrigerant pipe P1 can be damped only by providing a mass having a mass capable of exerting an inertial force sufficiently resisting the exciting force. The device 1 is configured simply as compared with a conventional vibration damping device.

Further, by changing the fitting position of the mounting hole 6c to the bolt 7, the distance from the weight 6b to the refrigerant pipe P1 can be arbitrarily changed. Also, the weight 6b
Can be arbitrarily replaced with a different weight. That is, the position of the center of gravity and the weight of the inertial mass body 6 are appropriately changed. Therefore, the inertial force acting on the inertial mass body 6 and the natural frequency of the vibration damping device 1 are appropriately adjusted according to the shape and specifications of the air conditioner C1 and the refrigerant pipeline P1 and the excitation force and the frequency of the refrigerant pipeline P1. Fine tuning is possible. Further, since the inertial force and the natural frequency can be arbitrarily adjusted as appropriate, it is not required to have a high processing accuracy for each component constituting the vibration damping device, and therefore, it is possible to reduce the manufacturing cost. .

Further, since the support plate 5 on which the refrigerant pipe P1 is supported is swingable, even when the refrigerant pipe P1 is disposed at an angle, the support plate 5 is set in accordance with the inclination angle. By tilting, the refrigerant pipeline P1 can be stably supported. Therefore, accuracy is not required for the piping work of the refrigerant pipe P1, and the piping process is facilitated.

Further, since oil is not used unlike the oil damper, it is more preferable in terms of hygiene and safety. Further, since there is no frequently sliding portion such as the ball screw 103 and the ball nut 106 of the mechanical snubber 100, no maintenance is required.

As described above, as an embodiment of the present invention, in the air conditioner C1 provided with the refrigerant pipe P1, the refrigerant pipe P
Although the description has been made using the vibration damping device 1 that supports the vibration damper 1, the present invention is not limited to this, and the vibration damping device of the present invention is applicable to various types of vibrating bodies on which an excitation force acts. More preferably, a facility equipped with a pipe or a duct that receives a temperature change at the time of start / stop and a vibration (shock) such as a rotational vibration force or an earthquake load during operation (for example, various plants for power generation, chemical, incineration, etc.) And air conditioners).

Further, if the support plate 5 can be swung by the hinge 4 as in the above-described vibration damping device 1, even if the refrigerant pipe P1 is disposed at an inclination,
By tilting the support plate 5 in accordance with the angle of inclination, it is more preferable because it can be stably supported, but the present invention is not particularly limited to this. For example, the refrigerant pipe P1 may be fixedly supported. That is, the support plate 5 (support member) may be any as long as the support plate 5 (support member) movably supports the refrigerant pipe P1 (vibrator) in the displacement direction of its thermal expansion.

In addition, if the inertial mass body 6 has the above-described structure including the support arm 6a and the weight body 6b provided at the tip of the support arm 6a, the center of gravity of the inertial mass body 6 is closer to the refrigerant pipe P1 (vibrator). You will be far away. That is, the inertial force generated in the inertial mass body 6 has a larger configuration, and the vibration damping effect can be enhanced. Further, if the support arm 6a has the above-described configuration having a plurality of mounting holes 6c in its longitudinal direction, the distance between the weight body 6b and the refrigerant pipe P1 (vibrating body) can be adjusted by the mounting holes 6c. In addition, if the weight 6b has the above-described configuration in which the weight 6b can be replaced with respect to the support arm 6a, the weight 6b
Can be arbitrarily changed. That is, the magnitude of the inertial force acting on the inertial mass body 6 and the natural frequency of the vibration damping device 1 are determined by the shape and specifications of the air conditioner C1 and the refrigerant pipeline P1, and the excitation force and the frequency of the refrigerant pipeline P1. It is more preferable because it can be adjusted as needed.

[0037]

As described above, the present invention has the following effects. According to the first aspect of the present invention, when an exciting force (dynamic displacement) acts on the vibrating body supported by the support member, an inertial force is generated in the inertial mass body provided on the support member. , And acts as a resistance (reaction) to the excitation force. Therefore, the excitation force acting on the vibrating body is reduced, and the vibration of the vibrating body is reduced. That is, since the vibration damping function has a simple configuration in which only a mass body (inertial mass body) is provided, the structure is simplified as compared with the conventional vibration damping device, and the manufacturing cost can be reduced. Further, when a thermal expansion displacement (static displacement) due to a temperature change acts on the vibrating body, the vibrating body generates a thermal expansion displacement in a movable displacement direction. Therefore, it is possible to absorb (diffuse) the thermal expansion displacement, and there is no possibility that the vibrating body may be damaged by twisting or twisting due to thermal expansion.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in the above, even when the vibrating body is arranged to be inclined at an arbitrary angle, by tilting the swingable support member in accordance with the inclination angle of the vibrating body, The vibrating body can be stably supported without being restricted by its arrangement state.

According to the invention described in claim 3, according to claim 1
Or, in addition to the effects of the vibration damping device according to claim 2,
Since the weight is provided at the tip of the inertial mass body, the center of gravity of the inertial mass body is farther away from the vibrating body.
Therefore, the inertial force generated on the inertial mass body by the principle of leverage becomes larger, and the vibration damping effect can be further enhanced.

According to the invention described in claim 4, according to claim 3,
In addition to the effects of the present invention, the position of the center of gravity of the inertial mass body is arbitrarily changed by adjusting the distance between the weight and the vibrating body. Therefore, the magnitude of the inertial force acting on the inertial mass body is maximized so that the vibration damping effect (vibration reduction effect) is maximized according to the shape and specifications of the vibrating body and the exciting force and the frequency of the vibrating body. The natural frequency of the pod can be finely adjusted as appropriate. In addition, since the inertia force and the natural frequency can be arbitrarily adjusted as appropriate, a high processing accuracy is not required for each component constituting the vibration damping device, and therefore, the manufacturing cost of the vibration damping device is reduced. It is possible to

According to the invention described in claim 5, according to claim 3,
In addition to the effects of claim 4, the weight can be arbitrarily replaced with a different weight. Therefore, depending on the shape and specifications of the vibrating body and the exciting force acting on the vibrating body and its frequency, the most damping effect (vibration reducing effect)
The magnitude of the inertial force acting on the inertial mass body and the natural frequency of the vibration damping device can be finely adjusted appropriately so that the inertia mass is exerted. In addition, since the inertia force and the natural frequency can be arbitrarily adjusted as appropriate, a high processing accuracy is not required for each component constituting the vibration damping device, and therefore, the manufacturing cost of the vibration damping device is reduced. It is possible to

According to the invention described in claim 6 or claim 8, the pipe or the duct is stably supported by a simple structure by the vibration damping device described in claim 1 to claim 5. Become. Therefore, the piping structure is further simplified, and maintenance is facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vibration damping device according to an embodiment of the present invention.

FIG. 2 is a view as viewed from A in FIG.

FIG. 3 is a sectional structural view of a conventional vibration damping device (mechanical snubber).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration suppression device 4 Hinge 5 Support plate 6 Inertial mass body 6a Support arm 6b Plummet body 6c Mounting hole 7 Bolt 8 Pipe holding P1 Refrigerant pipeline Fx, Fy, Fz Excitation force Hx Thermal expansion displacement

Claims (8)

[Claims] 1. A vibration damping device for reducing vibration of a vibrating body to which an exciting force acts, comprising: a supporting member that supports the vibrating body so as to be movable in a direction of thermal expansion displacement; And an inertial mass body on which an inertial force opposing the exciting force acts. 2. The vibration damping device according to claim 1, wherein the support member is provided to be swingable. 3. The inertial mass body includes a support arm having one end fixed to the support member, and a weight fixed to the other end of the support arm. Alternatively, the vibration damping device according to claim 2. 4. The vibration damping device according to claim 3, wherein a distance between the weight and the vibrating body is adjustable. 5. The vibration damping device according to claim 3, wherein the weight is configured to be detachable from the support arm. 6. A facility provided with a duct or a duct, wherein the duct or the duct is supported by the vibration damping device according to any one of claims 1 to 5. Equipment with pipelines or ducts 7. The equipment provided with a pipe or duct according to claim 6, wherein the equipment provided with the pipe or duct is an air conditioner provided with a refrigerant pipe through which a refrigerant flows. 8. The pipe according to claim 6, wherein the equipment provided with the pipe or the duct is a plant including a pipe or duct through which a fluid flows, such as power generation, chemical, and incineration. Equipment with roads or ducts.