JPH06281055A - Vibration-proof device for piping - Google Patents

Abstract

PURPOSE:To provide a vibration-proof device for piping which prevents adverse effects of fine vibration to a precision apparatus by the simple structure and has also the vibration resistance to impact such as earthquake. CONSTITUTION:Stoppers 21a, 21b whose top ends 23a, 23b abut on inner surfaces of side walls 11c, 11d of a casing body 11 by elastic bouncing force of a spring and slidably moved on the inner surfaces of the side walls 11c, 11d according to the extension/contraction in the axial direction of a spring vibration isolator 12 are provided on the side surfaces of a base plate 13 provided on the end of the spring vibration isolator 12, and engaging parts 25a, 26a to be engaged with the top ends 23a, 23b of the stoppers 21a, 21b when the spring vibration isolator 12 is axially moved by the extension/contraction thereof by the fixed distance are provided on the side walls 11c, 11d of the casing 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antivibration device for pipes, and more particularly to an antivibration device for pipes which is earthquake-proof.

[0002]

2. Description of the Related Art For example, in a semiconductor factory or the like, there is provided a piping facility for transferring a fluid such as a liquid or a gas to various equipments or by connecting these equipments. Not only the propagation of vibrations generated by these devices themselves,
When fluid flows in the piping, vibrations occur in the piping equipment due to various factors such as the discharge pressure of the pump. This vibration propagates through the support member of the pipe and affects the floor and ceiling. For example, when the pipe support member is fixed to the floor on the second floor, a precise measuring instrument such as a microscope, an optical instrument, or any other instrument requiring high precision is installed on the floor. The vibrations of the pipes greatly impair the accuracy of these measuring systems and the like. Therefore, a vibration isolator is provided on a support member of a pipe in a semiconductor factory or the like in order to protect it from various vibrations.

There are a hydraulic type and a spring type of this vibration isolator, but the hydraulic antivibration device is generally more complicated in structure and higher in cost than the spring type, so that it is generally used. Spring-type anti-vibration devices are often used. A conventional spring type vibration damping device for pipes is provided between a connecting member whose one end is fixedly supported by a fixed supporting member such as a ceiling and a connecting member whose one end is fixedly supported at a predetermined position of the pipe. There is one in which the connecting member of is connected via a spring. By doing this, it is possible to absorb the vibrations of various devices themselves and the vibrations generated in the piping equipment with a relatively simple structure,
It is possible to prevent the influence of vibration on various precision measuring instruments.

[0004]

The conventional vibration isolator for piping as described above is excellent in that it is possible to prevent the influence of so-called microvibration with a simple structure because it can control the vibration as described above. . However, since it is a spring type, it has a small vibration-proof load and does not function as a stopper against a large vibration or shock generated by an earthquake or water hammer.
Therefore, there is a risk that pipes, ducts, or racks may be damaged by large vibrations and impacts such as when an earthquake of a certain magnitude or more occurs, or when the flow velocity inside the pipe changes suddenly due to sudden opening / closing of the valve and water hammer occurs. There is

The present invention has been made in view of the above-mentioned problems of the prior art, and has a simple structure to prevent the influence of microvibration on precision instruments and the like, and also to have an earthquake resistance against an impact such as an earthquake. It is an object of the present invention to provide a vibration isolator for piping.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, the present invention has a housing in which a vibration-proof spring is arranged, one end of which is a first end of the housing. A substrate is provided that is in contact with the inner surface of the wall and is in contact with the other end of the anti-vibration spring, and the first connecting member joined to this substrate and the second end wall of the housing are joined together. In a vibration isolator for a pipe having a second connecting member, the tip end portion is brought into contact with the inner surface of the side wall of the housing by the elastic force of the spring, and the side wall is expanded or contracted in the axial direction of the vibration isolation spring. A stopper that slidably moves on the inner surface of the stopper is provided on a side surface of the substrate, and engages with a tip portion of the stopper when the stopper moves a predetermined distance in the axial direction due to expansion and contraction of the vibration-proof spring. A pipe vibration isolator, characterized in that a joint portion is provided on a side wall of the casing.

[0007]

In the present invention thus constructed, the generated vibration is transmitted to the first connecting member. The first connecting member is fixed to the substrate, and the vibration is transmitted from the substrate to the vibration-proof spring. Therefore, various vibrations can be absorbed by this anti-vibration spring, and the influence of the vibrations on various precision instruments can be prevented. The vibration generated at the other end of the anti-vibration spring is transmitted to the first end wall of the housing and further to the second connecting member fixed to the second end wall via the side wall of the housing. It will be almost absorbed by the anti-vibration spring.
On the other hand, when an earthquake such as a certain magnitude or more occurs and a large vibration or impact is applied, the tip of the stopper that is in contact with the inner surface of the side wall of the housing moves in the axial direction of the anti-vibration spring due to the elastic force of the spring. It moves by sliding on the inner surface of the side wall according to expansion and contraction. And
When the tip portion reaches the position of the engaging portion provided on the side wall of the housing, the stopper extends and the tip portion is inserted into and engaged with the engaging portion. In this way, the vibration-proof spring is locked, and large vibrations and shocks can be stopped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a schematic perspective view showing an embodiment of the vibration isolator for piping according to the present invention, FIG. 2 is a front view of the vibration isolator shown in FIG. 1, and FIG. FIG. 4 is a front view of the vibration isolator shown in FIG. 4, and FIG. 4 is a state of use of the vibration isolator shown in FIG.

As shown in FIGS. 1 and 2, the pipe vibration isolator 10 of this embodiment has a casing 11 made of a rectangular frame made of an iron plate. It is composed of a bottom wall 11a as one end wall, an upper wall 11b as a second end wall, and a right side wall 11c and a left side wall 11c as side walls. An anti-vibration spring 12 is provided inside the housing 11, and a spring support portion 16 is provided below the anti-vibration spring 12.
Is provided. The spring support portion 16 includes a seat plate 16a,
A guide portion 16b provided on the upper side of the seat plate 16a and a protrusion 16c provided on the lower side of the seat plate 16a. The inner diameter portion of the vibration-proof spring 12 is fitted into the guide portion 16b,
The inner diameter portion is positioned by the outer surface of the guide portion 16b. Further, a hole (not shown) is provided at the center of the bottom wall 11 a, and the protrusion 16 of the spring support portion 16 is provided.
c is inserted so as to fit in this hole. In this way, the vibration-proof spring 12 is arranged at a predetermined position inside the housing 11.

A substrate 13 is provided above the vibration-proof spring 12, and the substrate 13 has a guide portion 13a. The guide portion 13a is fitted into the inner diameter portion of the vibration-proof spring 12. A screw hole (not shown) is provided in the center of the substrate 13. A lower connecting member 14 as a first connecting member having an external thread formed therein is screwed into the screw hole,
By tightening the nut 18, the base plate 13 and the lower connecting member 14 are fixed via the washer. The lower connecting member 14 passes through a not-shown through hole provided in the center of the vibration-proof spring 12 and the spring support portion 16 and extends further downward. Then, as shown in FIG. 4, the lower connecting member 14 is fixedly supported by a fixing member 32 with a member such as the pipe 31 that needs to be vibration-proof. On the other hand, a hole (not shown) for joining the upper connecting member 15 as the second connecting member is provided in the upper wall 11b of the housing 11, and the upper connecting member 15 having a screw formed therein is inserted into this hole. After, nut 1
The housing 11 is inserted through the washer by tightening 7a and 17b.
The upper wall 11b and the upper connecting member 15 are fixed. The upper connecting member 15 extends further upward and is fixedly supported on the floor or ceiling of the second floor as shown in FIG.

In the vibration isolator of this embodiment, stoppers 21a and 21b are provided on the side surface of the substrate 13. The stoppers 21a and 21b are provided on the right side wall 11c side and the left side wall 11c.
It is arranged at a position facing the c side with respect to the c side. This is because when the stoppers 21a and 21b act, they are supported at two points in good balance. This stopper 21
The a and 21b have lock pins 22a and 22b in which springs (not shown) are housed, and the elastic force of the springs causes the tips 23a and 23b of the stoppers 21a and 21b to move to the right side wall 11c and the left side wall 11c, respectively. It is urged to abut the inner surface. Therefore, normally, the stoppers 21a and 21b are contracted by the right side wall 11c and the left side wall 11c. Then, when the members with which the tip portions 23a and 23b come into contact are removed, the stoppers 21a and 21b are removed.
Is extended by a built-in spring by a predetermined length. Further, the tip portions 22a and 22b have a spherical shape so that the tip portions 22a and 22b can slidably and smoothly move in contact with the inner surface of the right side wall 11c or the left side wall 11c according to the expansion and contraction of the vibration-proof spring 12 in the axial direction. I have to. The springs built in the lock pins 22a and 22b are not limited to this, and holes may be provided in the side surface of the substrate 13 to be fitted therein. In addition, the stopper 21
If balls are provided at the tip portions 23a and 23b of a and 21b so that the inner surface of the right side wall 11c or the left side wall 11c comes into contact with each other, smoother sliding is possible.

A right side wall 11c and a left side wall 11 of the casing 11
Engagement with c is an engagement portion that engages with the tip end portions 23a and 23b of the stoppers 21a and 21b when the stoppers 21a and 21b move in the axial direction by a predetermined distance due to expansion and contraction of the vibration-proof spring 12. Holes 25a and 25b are provided. The engagement holes 25a and 25b are provided at predetermined amplitude positions on the assumption that an earthquake or the like of a certain magnitude or more has occurred. When the vibration-proof spring 12 is greatly contracted due to an earthquake or the like and the tip portions 23a, 23b of the stoppers 21a, 21b reach the positions of the engagement holes 25a, 25b, the springs built in the lock pins 22a, 22b serve as stoppers. 21a and 21b extend, and the tip portions 23a and 23b
b is fitted in the engaging holes 25a and 25b so as to be engaged. Thus, the vibration-proof spring is locked.

Tip portions 23 of the stoppers 21a and 21b
The positions of the engagement holes 25a and 25b that engage with the a and 23b can be obtained as follows. For example, as shown in FIG. 4, when supporting the carbon steel pipe 31 for waterworks having a nominal diameter of 80 A from the ceiling 33, the vibration isolator 10 of this embodiment is 3 times.
Assume that they are installed at a metric pitch. At this time, the pipe weight was 15.3 kg / m × 3 m = 45.9 kg, the spring constant was 4.0 kg / mm, and the seismic intensity 5 (80-
Suppose an earthquake of 250 gal) occurs. Let s be the distance from the position where only the static load of the tips 23a and 23b of the stoppers 21a and 21b acts to the position where the vibration-proof spring 12 contracts due to the impact of an earthquake with a seismic intensity of 5 (s). 2), the following equation is established. 45.9 kg × 250 gal = 4.0 kg / mm × s ×
Therefore, s = 3 mm. As described above, the distance s is set on the premise of the seismic intensity that is likely to occur at the construction site such as the pipe. Further, although the load applied to one vibration isolator 10 varies depending on the type of piping and the method of supporting it, it is possible to easily cope with this by preparing several types of vibration isolator springs 12. is there.

Next, the operation of this embodiment will be described. When the pipe 31 is supported using the pipe vibration isolator 10 of this embodiment, as shown in FIG. 4, the end of the lower connecting member 14 on the opposite side of the vibration isolator 10 is fixed by the fixing member 32. Piping 31
The end of the upper connecting member 15 on the opposite side of the vibration isolator 10 is fixedly supported by the ceiling 33 and the like.

The vibration generated in the pipe 31 is transmitted to the lower connecting member 14 via the fixing member 32. Lower connection member 1
4 is fixed to the substrate 13, and the vibration is transmitted from the substrate 13 to the vibration-proof spring 12. Therefore, the vibration-proof spring 12 can absorb the vibrations of various devices themselves and the vibrations generated in the piping equipment, and can prevent the influence of so-called slight vibrations on various precision measuring instruments and the like. The vibration generated at the other end of the vibration-proof spring 12 is transmitted to the bottom wall 11a of the housing 11 via the spring support portion 16 and further fixed to the upper wall 11b via the right side wall 11c and the left side wall 11c of the housing 11. Although transmitted from the upper connecting member 15 to the ceiling 33 and the like, it is almost absorbed by the vibration-proof spring 12 described above.

When an earthquake of a certain magnitude or more occurs, a large vibration or impact is applied so that the contraction amount of the vibration-proof spring 12 exceeds the distance s shown in FIG. . In this case, the tips 2 of the stoppers 21a and 21b
2a and 22b slide and move smoothly while contacting the inner surfaces of the right side wall 11c and the left side wall 11c according to the axial contraction of the vibration-proof spring 12. Then, as shown in FIG. 3, when the tips 22a, 22b reach the positions of the engagement holes 25a, 25b, the stoppers 21a, 21b are extended by the springs built in the lock pins 22a, 22b, and the tips 21a, 21b are extended. 23a and 23b are fitted into and engaged with the engagement holes 25a and 25b. In this way, the anti-vibration spring is locked, and the anti-vibration spring 10 functions as a rigid hanger and can stop vibration and impact.

In this way, it is possible to prevent damage to pipes, ducts, or racks due to large vibrations or shocks such as when an earthquake of a certain magnitude or more occurs. In addition, a situation in which the fluid in the pipe flows out due to this damage can be simply and reliably avoided, and the safety is high.

The above is one embodiment of the present invention, and the present invention can be variously modified without departing from the scope of the claims. For example, in the above-described embodiment, the housing 11 has a rectangular frame shape with the front and rear opened as shown in FIG. May be further added at two positions before and after. By doing so, the rigidity is further increased. Alternatively, the housing 11 may be formed in a cylindrical shape, and the stoppers may be provided on the side surface of the substrate 13 at the equally distributed positions in the circumferential direction. Although the engaging holes 25a and 25b are provided below the stopper position when only a static load is applied, they may be provided above. Further, the vibration-proof spring 12 has a bottom wall 11 of the housing 11 via a spring support portion 16.
Although it is made to abut on a, it may be made to abut on the upper wall 11b.

[0019]

As described above, according to the vibration isolator for a pipe of the present invention, the generated vibration is transmitted from the first connecting member to the vibration isolator via the substrate. Therefore, various vibrations can be absorbed by this anti-vibration spring, and the influence of the vibrations on various precision instruments can be prevented. on the other hand,
When an earthquake such as a certain magnitude or more occurs and a large vibration or shock is applied, the elastic force of the spring causes the tip of the stopper that abuts the inner surface of the side wall of the housing to expand and contract in the axial direction of the vibration-proof spring. Accordingly, the stopper slides and moves on the inner surface of the side wall, and when the tip portion reaches the position of the engaging portion provided on the side wall of the housing, the stopper extends and the tip portion is inserted into and engaged with the engaging portion. In this way, the vibration-proof spring is locked, and large vibrations and shocks can be stopped. In this way, it is possible to prevent damage to pipes, ducts, or racks due to large vibrations or shocks such as when an earthquake of a certain magnitude or more occurs. In addition, a situation in which the fluid in the pipe flows out due to this damage can be simply and reliably avoided, and the safety is high.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a vibration damping device for piping according to the present invention,

2 is a front view of the vibration damping device shown in FIG. 1,

FIG. 3 is a front view of the vibration damping device shown in FIG. 1 in a state in which a stopper is operated,

FIG. 4 is a usage state diagram of the vibration damping device shown in FIG.

[Explanation of symbols]

Reference numeral 11 ... Casing, 11a ... Bottom wall (first end wall) 11b ... Top wall (second end wall) 11c ... Right side wall (side wall) 11c ... Left side wall (side wall) 12 ... Anti-vibration spring 13 ... Substrate 14 ... Lower connecting member (first connecting member) 15 ... Upper connecting member (second connecting member) 21a, 21b
... Stoppers 23a, 23b ... Tip portions 25a, 25b
... Engagement hole (engagement part)

Claims (1)

[Claims] 1. A housing (11) having an anti-vibration spring (12) disposed therein, one end of the anti-vibration spring (12) being a first end wall (11a) of the housing (11). ) Is provided so as to abut the inner surface of the substrate, and a substrate (13) that abuts the other end of the vibration-proof spring (12) is provided.
A pipe vibration isolator having a first connecting member (14) joined to 3) and a second connecting member (15) joined to a second end wall (11b) of the housing (11) The tip portions (23a, 23b) are brought into contact with the inner surfaces of the side walls (11c, 11d) of the casing (11) by the elastic force of the spring, and
The stoppers (21a, 21b) that slidably move on the inner surfaces of the side walls (11c, 11d) according to the axial expansion and contraction of (12) are provided on the substrate.
Provided on the side surface of (13), when the stopper (21a, 21b) is moved by a predetermined distance in the axial direction due to expansion and contraction of the vibration-proof spring (12), the tip end portion (23a, 21a) of the stopper (21a, 21b). 23b) engaging part (25
a, 25b) are provided on the side walls (11c, 11d) of the casing (11), and a vibration damping device for piping is provided.