JP3388300B2 - Pressure pulsation reduction pipe and pressure pulsation reduction impulse pipe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure pulsation reducing pipe and a pressure guiding pipe, and particularly to reducing or adjusting the pressure pulsation generated in the piping or the pressure guiding pipe, and reducing the pressure pulsation applicable to a pressure measuring device, a power generator, etc. Piping and pressure pulsation reducing impulse pipe.

[0002]

2. Description of the Related Art Conventionally, as described in JP-A-4-125391 and JP-A-63-259294,
It has been known that even thinner pipes are branched from the pipe line to prevent pulsation, but these require additional work such as welding because the structure of the pipes must be changed, and thin pipes such as pressure-conducting pipes are required. It does not assume a pipeline. In addition, it does not deal with pressure pulsation due to vibration of a fixed part such as a building due to an earthquake.

[0003]

As described above, there is no conventional example in which a device for preventing pulsation when an extremely thin pipe is used has been devised, and a pressure guiding pipe used as a monitoring detector in an industrial plant is used. The generated pressure pulsation causes the detector to output an abnormal signal, which may cause the control system to malfunction. Therefore, a pulsation preventive technique suitable for a pressure guiding tube for measuring a pressure by branching a conduit from a measurement target has been desired.

The object of the present invention can be applied not only to a pressure detecting pressure guiding pipe for branching a pipe from a measurement object and transmitting pressure to a pressure detector through a fluid contained therein, but also to general piping. A method and an apparatus capable of reducing pressure pulsation generated in a pipe or a pressure guiding pipe, and a pressure pulsation reducing pipe and a pressure pulsation reducing pressure guiding pipe.

[0005]

In order to achieve the above-mentioned object, the present invention fixes a pipe to a fixed portion by a plurality of supporting members, and at least adjoins the plurality of supporting members .
Make the spacing between one set of support members larger than the other, and
A pipe portion that bends the pipe and can swing with respect to the fixed portion is provided,
The pipe portion extends via line to the swaying direction, and said pipe
It is characterized in that the natural frequency of the portion is made to approximately match the natural frequency of the fluid in the pipe.

Further, one end of the pressure detector and the other end connecting pipe which had been opened to the pipe or container or the like containing the fluid to be measured is fixed to the fixed portion by a plurality of support members, supporting the plurality At least one adjacent member
Make the spacing between the support members of the set larger than others, and
Bending make the pipe section that can sway relative to the fixed portion, the tube portion
Is characterized in that the swinging direction to the conduit extends, and has a natural frequency of the tube portion is the natural frequency and substantially aligned in the tube fluid.

Further, by absorbing the kinetic energy of the fluid in the pipe by the kinetic energy of the pipe, the pressure pulsation of the pipe is reduced, or the pipe fixed to the fixing portion by a plurality of supporting members is used. By providing a swingable pipe route with respect to the fixed portion and changing the shape or length of the pipe route, or by attaching a viscoelastic body to a part of the pipe to change the mass and bending rigidity, It is characterized in that the natural frequency of the pipe is changed to adjust the reduction of the pressure pulsation of the pipe. The pressure detector used in the present invention is a device that measures the pressure itself and a device that operates in response to the pressure.

[0008]

According to the above construction, the fluid in the pressure guiding tube and the pressure guiding tube are vibrated in a coupled manner by forming the swayable portion in the pressure guiding tube. Then, the energy of the fluid in the pressure guiding tube is converted into the vibration energy of the pressure guiding tube, and as a result, the effect of reducing the pressure pulsation can be obtained. Further, a member or means for providing a damping effect is incorporated in the pressure guiding tube system to absorb the vibration energy of the pressure guiding tube, and the damping effect is also reflected in the fluid in the pressure guiding tube, so that the pressure pulsation is reduced more effectively.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the pressure measuring device according to the present invention. The fluid in the pressure guiding tube 1 transmits the pressure of the fluid contained in the pipe 2 to the pressure detector 3. The pressure guiding tube 1 is fixed to a fixed part such as a building by a supporting member 4, but the space between the two adjacent supporting members 4a is widened, and the pressure guiding tube 11 between the supporting members 4a is fixed to the fixing part. Can sway in the direction of arrow A, and as a result, coupled vibration with the fluid in the pressure guiding tube occurs. Therefore, hereinafter, in order to distinguish the swingable portion of the pressure guiding tube from the fixed portion, it is referred to as a coupled pressure guiding tube. The coupled pressure guiding tube 11 has a length in the direction indicated by the arrow A, and the natural frequency of the coupled pressure guiding tube 11 itself substantially matches the natural frequency of the fluid in the pressure guiding tube. In addition, by making the direction of arrow A roughly coincide with the structure of the fixed part or the direction in which the pipeline system easily shakes depending on the site conditions, the pulsation reduction effect can be obtained even for pressure pulsation due to vibration of the fixed part due to an earthquake or the like. Obtainable.

FIG. 2 is a perspective view of the supporting member 4, and shows that the pressure guiding tube 1 is fixed to the fixing portion 5 with the U-shaped bolt 41 via the column 42 and the U-shaped bolt mounting portion 43. ing. FIG. 3 is a cross-sectional view of the pressure guiding tube mounting portion of the support member 4, in which the pressure guiding tube 1 has a U-shaped bolt 41 and a nut 4.
4, the washer 45, and the spring washer 46 are fixed to the U-shaped bolt mounting portion 43. The method of attaching the support member 4 and the pressure guiding tube is an example, and the method of fixing the pressure guiding tube 1 to the fixing portion 5 is not limited to this.

FIG. 4 shows a pipeline system analyzed to show the effect of the pressure pulsation reducing pressure guiding tube according to the present invention. This pressure guiding tube 1 is SUS304TP 3 / 8B SCH40 specified in JIS G 3459,
Outer diameter φ17.3mm, thickness 2.3mm, weight 0.859k
g / m. And the pressure guide tube 1 has a total length L = 20,000.
mm, L ₁ = 284 mm, L ₂ = 716 mm, L ₃ = 1,
_{650mm, L 4 = 716mm, L} 5 = 284mm, L 6
= 4,350mm, which is L ₇ = 12,000mm. Further, the coupled pressure guiding tube 11 between the supporting members 4a having the widened spacing of the supporting members 4 swings in the direction of the arrow A with respect to the fixed portion, but the other portions are fixed so that they are fixed. It is supported.

The effects of the embodiment shown in FIG. 4 will be described with reference to the drawings. First, in FIG. 5, when the coupled pressure guiding tube 11 in FIG. 4 is fixed, that is, the pressure guiding tube 1
Shows the frequency characteristic of the pressure detected by the pressure detector 3 in the case where the whole is fixed and there is no swingable portion. The horizontal axis of this figure shows the frequency, and the vertical axis shows the response magnification, which is the magnification of the response pressure with respect to the pressure pulsation of the pipe 2. In this case, the resonance frequency is 17.7 Hz and the maximum response magnification is 53 times. Next, FIG. 6 shows similar frequency characteristics when the present invention is applied as shown in FIG. In this case, the resonance frequency is 18.5 Hz and the maximum response magnification is 14 times, which is 27% of the case where the whole is fixed, and it can be seen that the pressure pulsation is reduced. Next, we show the effect when the whole piping system shakes like an earthquake. First, FIG. 7 shows a frequency characteristic of pressure detected by the pressure detector 3 when the coupled pressure guiding tube 11 is fixed, that is, when the entire pressure guiding tube 1 is fixed and there is no swingable portion. . The horizontal axis of this figure shows the frequency, and the vertical axis shows the response pressure as the response magnification with respect to the acceleration of the fixed portion. In this case, the resonance frequency is 17.7 Hz and the maximum response magnification is 0.030 kgf / c.
m ² / gal. Next, FIG. 8 shows similar frequency characteristics when the present invention is applied as shown in FIG. In this case, the resonance frequency is 16.0 Hz and the maximum response magnification is 0.00
It is 6 kgf / cm ² / gal, which is 20% of the case where the whole is fixed, and it can be seen that the pressure pulsation is reduced.

As the conditions for analyzing the frequency characteristics described above, in addition to the above-mentioned dimensions for the pressure guiding tube 1, the longitudinal elastic modulus of the material of the tube is 1.97 × 10 ⁶ kgf / cm ² , and the damping ratio is 0.9. 10, and the bulk modulus of the fluid in the pressure guiding tube is 2.0 x 1
0 ⁴ kgf / cm ² , specific weight 0.001 kgf / cm ³ ,
The damping ratio is 0.01. The resonance frequency of the coupled pressure guiding tube 11 itself when there is no fluid is 17.7 Hz, and the vibration of the fixed portion was performed in the direction of arrow A.

FIG. 9 shows a portion of the embodiment shown in FIG. 1, which corresponds to the coupled pressure guiding tube 11 between the supporting members 4a having a wide space between the supporting members 4 and which swings with respect to the fixed portion. Another embodiment of the present invention will be described with reference to FIGS. Each of the coupled pressure guiding tubes 11 shown in FIGS. 9 to 20 sways in the direction of arrow A with respect to the fixed portion, has a length in the direction indicated by arrow A, and has a natural frequency of the pressure guiding tube itself inside the pressure guiding tube. It is roughly matched with the natural frequency of the fluid.

FIG. 10 shows an example in which the straight line connecting the support members 4a is not parallel to the arrow A. FIG. 11 shows an example in which the coupled pressure guiding tube 11 does not have a portion parallel to the arrow A. FIG. 12 is an example in which the number of bends of the compound pressure guiding pipe 11 is three or more, and the number of bends of the compound pressure guiding pipe 11 is not particularly limited. FIG. 13 is an example in which the coupled pressure guiding tube 11 has a portion that is not a straight line, and since the coupled pressure guiding tube need not have a straight line, it is a semicircle in this figure, but is not limited to this. is not. FIG. 14 shows each support member 4
This is an example in which the pressure guiding tube of the portion supported by a is not parallel. FIG. 15 is an example in which the coupled pressure guiding tube 11 has two or more portions having a length in the direction of the arrow A, and the number is two in this figure, but the number is not limited to this. FIG. 16 is an example in which the coupled pressure guiding tube 11 is not on the same plane,
The spiral shape is shown in this figure, but the invention is not limited to this. FIG. 17 is an example in which there is no part that returns in the direction toward the pressure detector of the coupled pressure guiding tube, and it is Z-shaped in this figure, but it is not limited to this.

An object of the present invention is to reflect the damping of the pressure guiding pipe system in the fluid in the pressure guiding pipe to obtain a reducing effect on the pressure pulsation. The damping ratio of the coupled pressure guiding line system is the damping of the fluid in the pipe. The pulsation reduction effect is obtained when the ratio is larger than the ratio, but the pulsation reduction becomes more effective as the damping ratio of the coupled pressure guiding line system increases. Further, it is desirable that the damping ratio of the coupled pressure guiding line system is set to be larger than twice the damping ratio of the fluid in the pipe. However, the pressure guiding tube is generally made of a metal material such as steel, and its damping ratio is often smaller than that of the fluid in the tube. From this, it is proposed in claim 2 that the pulsation reducing effect is obtained by adding a device for providing a damping effect to the coupled pressure guiding tube, which is also applied to general piping. Further, adding a device for providing a damping effect to the coupled pressure guiding pipe also suppresses the vibration of the coupled pressure guiding pipe, and therefore also makes the pipeline system safe.

FIG. 18 shows an example in which the damping device 6 is attached to the coupled pressure guiding pipe 11 in order to increase the damping of the pressure guiding pipe system. The damping device 6 is a device for providing a damping effect to the coupled pressure guiding line system, and its purpose is to absorb the energy of a vibration system represented by a hydraulic damper, a viscous damper, a friction damper, an electromagnetic damper and the like to obtain a damping effect. It is a device. FIG. 19 is an example in which a part of the coupled pressure guiding tube 11 is covered with the viscoelastic body 71, and a damping effect can be obtained by the viscoelastic body 71 that deforms corresponding to the coupled pressure guiding tube 11. In this example, the viscoelastic body 71 covers only the part of the coupled pressure guiding tube 11 but covers the whole, or even if the viscoelastic body 71 does not cover the entire outer circumference of the coupled pressure guiding tube 11. The effect can be obtained.

FIG. 20 shows an example in which at least a part of the coupled pressure guiding tube 11 is immersed in the viscous body 72 contained in the container 721. In this figure, the coupled pressure guiding tube 11 is directly immersed in the viscous body 72, but this is not particularly necessary, and a member for being immersed in the viscous body 72 is connected to the coupled pressure guiding tube 11 and the member is The same effect can be obtained by immersing in 72. In that case, the shape and material of the member immersed in the viscous body 72 are not limited, and the structure should be such that a more effective damping effect can be easily obtained than when the coupled pressure guiding tube 11 is directly immersed in the viscous body 72. Further, the size can be further reduced. Further, in this figure, the viscous body 72 is housed in the container 721, but this is not particularly necessary, and at least one of the members for dipping in the coupled pressure guiding tube 11 or the viscous body 72 connected to the coupled pressure guiding tube 11 is used. It suffices that the parts contact the viscous body 72.

Further, FIG. 21 and subsequent figures show still another embodiment of the present invention. FIG. 21 shows a compound pressure guiding tube 11
In the example in which at least a part of the above is brought into contact with the support base 73, a damping effect can be obtained by friction between the pressure guiding tube 11 and the support base 73 or play. FIG. 22 shows a compound pressure guiding tube 1
Viscous body 74 between at least a part of
It is an example of contacting with. FIG. 23 shows an example in which at least a part of the coupled pressure guiding tube 11 is brought into contact with the roller 75 between the supporting base 751 and the roller 75 absorbs energy of the coupled pressure guiding tube 11, and 11 places 75, rollers 75
A damping effect can be obtained by the friction between the support base 751 and the support base 751. The damping effect can also be obtained by adding a viscous body that covers at least a part of the rollers 75. Although there are a plurality of cylindrical rollers of the same type as the roller 75 in this figure, this is a member that is sandwiched between the compound pressure guiding tube 11 and the support base 751 and is moved by the compound pressure guiding tube 11. The number is not limited to this.

These can also be used to suppress vibration of the pressure guiding tube in directions other than the desired direction. For example,
It can be used to regulate the direction perpendicular to the A direction of the coupled pipe 11 in FIG. 1, and can prevent the damping action and the pipe breakage.

24 to 27 show an example of a damping increasing method applied to the supporting portion of the pressure guiding tube 1 in the supporting member 4, which is applied to the supporting member 4a or to the coupled pressure guiding tube 11 as a damping device. By attaching it, a damping effect can be obtained. FIG. 24 shows a pressure guide tube 1 and a U-shaped bolt 4.
This is an example in which the viscoelastic body 76 is sandwiched between 1 and 1. Although the outer circumference of the pressure guiding tube 1 is entirely covered in this figure, the damping effect can be obtained by only covering a part of the pressure guiding tube 1. FIG. 25 shows U
A viscoelastic body 77 is provided between the V-shaped bolt mounting portion 43 and the nut 44.
It is an example in which is inserted. In this figure, the viscoelastic body 77 is sandwiched between both nuts 44 of the U-shaped bolt 41, but it is possible to obtain a damping effect with only one of them. FIG. 26 shows an example in which the pressure guiding tube 1 is fixed by the viscoelastic body 78 instead of the U-shaped bolt 41. In this figure, the viscoelastic body 78 is fixed by the viscoelastic body stopper 781 instead of the nut 44. However, the viscoelastic body fixing method is not limited to this method. FIG. 27 shows an example in which the U-shaped bolt mounting portion 43 is a viscoelastic body 79.

The supporting portion of the pressure guiding tube 1 shown by these is a method of fixing the pressure guiding tube 1 with the U-shaped bolt 41 and the nut 44 shown in FIG. 3, and the damping increasing method therefor has been described. The same effect can be obtained even for a member having a function corresponding to that of the fixed portion of the member supporting the other pressure guiding tube. Further, the damping increasing method applied to the supporting portion is not limited to this.

In FIG. 28, when the measurement object is a gas such as steam and the fluid in the pressure guiding tube 1 is a liquid 83 such as water, the pressure of the measurement object is measured in the pressure guiding tube 1 using the pressure transmission device 8. This is an example of leading to a fluid. Even when such a device is provided, the present invention can be applied to the pressure guiding pipe between the pressure transmitting device 8 and the pressure detector 3. However, the pressure transmission device that guides the pressure to be measured to the fluid in the pressure guiding pipe when the measurement target is the gas 82 such as steam and the fluid in the pressure guiding pipe is the liquid 83 such as water is not limited to this.

The present invention is characterized in that the natural frequency of the swayable pressure guiding tube is approximately matched with the natural frequency of the fluid in the tube. However, the natural frequency of the fluid in the tube and the natural frequency of the swayable pressure guiding tube are different from those of the product. It may differ from the designed one due to manufacturing errors. At that time, it becomes necessary to adjust at least one natural frequency, and some adjustment methods will be shown.

First, regarding the adjustment method for the fluid in the pipe,
The natural frequency can be changed by changing the total length of the pressure guiding tube or the temperature or material of the fluid in the tube. Next, some methods of adjusting the impulsive pressure guiding tube will be described. At least one load member is attached to the coupled pressure guiding tube 11, or at least one already installed load member is removed, or at least a part of the member is removed. The weight of the impulse line system is increased or decreased by changing the shape, changing the position, or cutting the coupled impulse line, or changing the position of the center of gravity. The natural frequency of the impulse pressure tube can be adjusted. Also, if a damping device is attached to the compound pressure guiding pipe, the damping device that has a mechanism that can be adjusted or adjusted by the load and rigidity exerted on the compound pressure guiding pipe of the damping device, or its mounting position, By changing it, the natural frequency of the coupled pressure guiding tube can be adjusted.

FIG. 29 shows a method by changing the positions of the supporting member 4a, the pressure guiding tube and the fixed portion as shown by the two-dot chain line. FIG. 30 shows a method by changing the positions of the U-shaped bolt 41 and the pressure guiding tube and the fixed portion as shown by the two-dot chain line. 29 and 30 both adjust the natural frequency of the compound pressure guiding tube by changing the length of the compound pressure guiding tube 11 by displacing the portion for fixing the pressure guiding tube with respect to the pressure guiding tube and the fixing portion. However, shifting the portion fixing the pressure guiding tube and the fixing portion with respect to the pressure guiding tube is not limited to this method.

FIGS. 31, 32, and 33 show a method by changing the shape of the pipe to one of the two-dot chain lines. These methods are examples of adjusting the natural frequency of the coupled pressure guiding tube by changing the shape of the piping to change the length and bending rigidity of the coupled pressure guiding tube. The shape of the pressure guiding tube shown by the solid line and the two-dot chain line in FIGS. 29 to 33 is an example, and the object and method for adjusting the natural frequency of the coupled pressure guiding tube are not limited thereto. FIG. 34 shows the same shape as the example of the device for providing the damping effect of FIG.
By attaching 1 as the viscoelastic body 9 as it is or by replacing it with an elastic body, the mass and bending rigidity of the coupled pressure guiding tube system are changed, and the natural frequency of the coupled pressure guiding tube is adjusted. In addition, by changing the length of b shown in FIG. 34, or in FIG.
By changing t, that is, the thickness of the viscoelastic body 9, the natural frequency of the coupled pressure guiding tube can be adjusted even if the mass and bending rigidity of the coupled pressure guiding system are changed.

Further, FIGS. 36 and 37 are examples in which a part of the viscoelastic body 9 is deleted, but this viscoelastic body can be added in reverse, and the natural vibration of the coupled pressure guiding tube can be increased or decreased. You can adjust the number. In this example, the viscoelastic body 9
Does not cover the whole of the coupled pressure guiding tube 11, but if it covers the whole, or if the viscoelastic body 9 does not cover the entire outer circumference of the coupled pressure guiding tube 11, the viscoelastic body 9 is uniform. This method is effective even when the thickness and the quality are not the same, and the natural frequency of the coupled pressure guiding tube can be adjusted.

Needless to say, these embodiments can be applied independently, but the present invention can also be applied to a plurality of combinations. In addition, the direction of arrow A is the structure of the fixed part,
Alternatively, the pulsation reducing effect can be obtained even for the pressure pulsation caused by the vibration of the fixed portion due to an earthquake or the like, by making it approximately coincident with the swaying direction of the pipeline system which depends on the site condition. Even if there are multiple swaying directions of the fixed part, the swaying has a length in a direction substantially corresponding to each direction and the natural frequency of the pipe itself substantially matches the natural frequency of the fluid in the pressure guiding pipe. The present invention can be applied by providing at least one obtainable portion.

The present invention is not limited to these examples. Further, in these examples, the case where the pipe 2 is branched is described, but the present invention is not limited to this, and is also applied to a case where the device is branched from another device such as a container containing a fluid. can do. Further, the fluid in the pressure guiding tube is not limited to the one having the same quality as the fluid to be measured. Also, in the pipeline system where one end of the pressure guiding tube is closed, the case where the fluid is stationary is shown.
The present invention can be applied regardless of the end condition of the pressure guiding tube and when the fluid is not stationary. Further, although the pressure detecting pressure guiding pipe is shown in the embodiment, the present invention can be applied as long as it is necessary to reduce the pressure pulsation of the fluid in the pipe.

FIG. 38 shows an embodiment of the pressure pulsation reducing pipe when the present invention is applied to a general pipe. The pipe 12 is fixed to the fixed portion by the support member 4, but the space between the two adjacent support members 4a is widened, and the pipe 13 between the support members 4a is in the direction of arrow A with respect to the fixed portion. Can swing to. The natural frequency of the pipe itself, which has a length in the direction indicated by the arrow A and can sway, is approximately matched with the natural frequency of the fluid in the pipe. In addition, by making the direction of arrow A roughly coincide with the structure of the fixed part or the direction in which the entire pipeline system easily shakes due to location conditions, the pulsation reduction effect can be achieved even for pressure pulsation due to vibration of the fixed part due to an earthquake or the like. Can be obtained. The pressure pulsation reducing pipe is not limited to this.

[0032]

According to the present invention, the pressure pulsation generated in the pipe or the pressure guiding pipe can be reduced. Further, therefore, the present invention can be applied to a pressure detecting pressure guiding tube for branching a pipe from a measurement target and transmitting the pressure to a pressure detector via a fluid contained therein, a pressure measuring device, a power generator, and the like.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view showing an embodiment of a pressure measuring device to which a pressure pulsation reducing pressure guiding tube according to the present invention is applied.

FIG. 2 is a perspective view of a supporting portion of a pressure detecting pressure guiding tube.

FIG. 3 is a side view in which a part of a supporting portion of a pressure detecting pressure guiding tube is shown as a cross section.

FIG. 4 is a plan view of a pipeline system analyzed to show the effect of the pressure pulsation reducing pressure guiding tube in the present invention.

FIG. 5 is an analysis result for showing the effect of the pressure pulsation reducing pressure guiding tube in the present invention, and is a frequency characteristic diagram with respect to pulsation of the pipe when the entire pressure guiding tube is fixed.

FIG. 6 is an analysis result for showing the effect of the pressure pulsation reducing pressure guiding tube in the present invention, and is a frequency characteristic diagram with respect to pulsation of the pipe when the present invention is applied.

FIG. 7 is a result of analysis for showing the effect of the pressure pulsation reducing pressure guiding tube in the present invention, and is a frequency characteristic diagram with respect to the acceleration of the building when the entire pressure guiding tube is fixed.

FIG. 8 is a result of analysis for showing the effect of the pressure pulsation reducing pressure guiding tube in the present invention, and is a frequency characteristic diagram with respect to the acceleration of the building when the present invention is applied.

FIG. 9 is a plan view of an embodiment of a coupled pressure guiding tube between support members.

FIG. 10 is a plan view of an embodiment of a coupled pressure guiding tube between support members.

FIG. 11 is a plan view of an embodiment of a coupled pressure guiding tube between support members.

FIG. 12 is a plan view of an embodiment of a coupled pressure guiding tube between support members.

FIG. 13 is a plan view of an embodiment of a coupled pressure guiding tube between support members.

FIG. 14 is a plan view of an embodiment of a coupled pressure guiding tube between support members.

FIG. 15 is a plan view of an embodiment of a coupled pressure guiding tube between support members.

FIG. 16 is a plan view of an embodiment of a coupled pressure guiding tube between support members.

FIG. 17 is a plan view of an embodiment of a coupled pressure guiding tube between support members.

FIG. 18 is a plan view of an embodiment of a method for increasing the damping of a coupled pressure guiding tube between supporting members.

FIG. 19 is a plan view of an embodiment of a method for increasing damping of a coupled pressure guiding tube between support members.

FIG. 20 is a side view of an embodiment of a method of increasing damping of a coupled pressure guiding tube between support members.

FIG. 21 is a side view of an embodiment of a method of increasing damping of a coupled pressure guiding tube between support members.

FIG. 22 is a side view of an embodiment of a method of increasing damping of a coupled pressure guiding tube between support members.

FIG. 23 is a side view of an embodiment of a method for increasing damping of a coupled pressure guiding tube between support members.

FIG. 24 is a side view, partly in section, of an embodiment of a method of increasing the damping of a support member.

FIG. 25 is a side view, partly in section, of an embodiment of a method of increasing damping of a support member.

FIG. 26 is a side view, partly in section, of an embodiment of a method of increasing the damping of a support member.

FIG. 27 is a side view, partly in section, of an embodiment of a method for increasing damping of a support member.

FIG. 28 is a side view in which a part of the pressure measuring device including a pressure transmitting device is shown in section.

FIG. 29 is a plan view of the coupled pressure guiding tube between the support members in the embodiment of the method for adjusting the natural frequency of the coupled pressure guiding tube.

FIG. 30 is a plan view of a support member of an embodiment of a method for adjusting the natural frequency of a coupled pressure guiding tube.

FIG. 31 is a plan view of the coupled pressure guiding tube between the support members in the embodiment of the method for adjusting the natural frequency of the coupled pressure guiding tube.

FIG. 32 is a plan view of the coupled pressure guiding tube between the support members in the embodiment of the method for adjusting the natural frequency of the coupled pressure guiding tube.

FIG. 33 is a plan view of the coupled pressure guiding tube between the support members in the embodiment of the method for adjusting the natural frequency of the coupled pressure guiding tube.

FIG. 34 is a plan view showing a cross section of a part of the coupled pressure guiding tube between the support members in the embodiment of the method for adjusting the natural frequency of the coupled pressure guiding tube.

FIG. 35 is a cross-sectional view of the viscoelastic body and the coupled pressure guiding tube in the embodiment of the method for adjusting the natural frequency of the coupled pressure guiding tube.

FIG. 36 is a cross-sectional view of the viscoelastic body and the coupled pressure guiding tube in the embodiment of the method for adjusting the number of natural vibrations of the coupled pressure guiding tube.

FIG. 37 is a cross-sectional view of the viscoelastic body and the coupled pressure guiding tube in the embodiment of the method for adjusting the number of natural vibrations of the coupled pressure guiding tube.

FIG. 38 is a partial cross-sectional plan view showing an embodiment of the pressure pulsation reducing pipe according to the present invention.

[Explanation of symbols]

1 impulse tube 2 piping 3 Pressure detector 4,4a, 4b Support member 5 Fixed part (building) 6 attenuator 8 Pressure transmission device 9 Viscoelastic body 11 Coupled impulse pipe 12 piping 13 Piping 41 U-bolt 42 props 43 U-shaped bolt mounting part 44 nuts 45 washers 46 spring washers 71 Viscoelastic body 72 Viscous body 73 Support 74 Viscous body Around 75 76 Viscoelastic body 77 Viscoelastic body 78 Viscoelastic body 79 Viscoelastic body 82 gas 83 liquid 721 container 741 support 751 support 781 Viscoelastic stopper

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Fuji, 3-1-1 Sachimachi, Hitachi City, Ibaraki Prefecture Hitachi Ltd. Hitachi factory (56) Reference JP-A-57-153974 (JP, A) Kai 51-95576 (JP, A) JP 48-70328 (JP, A) Actual 60-28643 (JP, U) Actual 57-65300 (JP, U) (58) Fields investigated (58) Int.Cl. ⁷ , DB name) F16L 55/00 F16L 55/02 F16L 55/04 F17D 1/20 F16L 3/00-3/24 F16F 15/02-15/08

Claims (6)

(57) [Claims] 1. A pipe is fixed to a fixing portion by a plurality of support members, and at least adjacent to the plurality of support members.
The spacing between one pair of support members is larger than the other, and
A pipe section that can sway relative to said fixed portion by bending a pipe is provided, the pipe section extending the conduit to the swaying direction, and the natural vibration of the fluid inside the tube natural frequency of the <br/> pipe portion Pressure pulsation reduction piping characterized by being roughly matched with the number. 2. The pressure pulsation reducing pipe according to claim 1, wherein a damping means is provided in the swayable pipe portion. 3. A pressure detector at one end, and a pressure guide tube opened at a pipe or a container containing a fluid to be measured at the other end is fixed to a fixing portion by a plurality of supporting members,
A space between at least one set of adjacent support members of the plurality of support members is made larger than others, and the pipe between them is bent.
Wherein creating a tube portion which can swing relative to the fixed portion, the tube portion extends the conduit in the direction of swaying its <br/>, and the natural frequency of the natural frequency of the tube fluid tube portion Te A pressure pulsation-reducing pressure guiding tube characterized by being roughly matched. 4. The pressure pulsation reducing pressure guiding pipe according to claim 3, wherein a damping means is provided in the swayable pipe portion. 5. A pressure measuring device, wherein the pressure pulsation reducing pressure guiding tube according to claim 3 or 4 is incorporated in a pipe connecting a measurement target and a detector. 6. A power generating apparatus, wherein the pressure pulsation reducing pressure guiding tube according to claim 3 or 4 is incorporated in a monitoring pressure detecting device.