JPH06185691A - Control device for suppressing sound and vibration of liquid for liquid pipe line - Google Patents

Abstract

PURPOSE:To control noise and vibration which tend to be generated during feed of liquid at a high pressure, by providing a cylindrical body attached to a pipe line for feeding liquid and by attaching an orifice plate formed therein with a plurality of orifices, to the cylindrical body. CONSTITUTION:In a liquid control device 1, a cylindrical body 2 made of steel is divided at a position which is slightly shifted from the center thereof toward one end thereof, and several orifices plates 10 each formed with a plurality of orifices 11, are welded and attached to the divided body parts in the vicinity of their one end. Further, the divided parts are welded one another so as to form a connection part 3, and flanges 4 are welded to opposite ends of the cylindrical body 2. In such a liquid control device, when liquid flows through the cylindrical body 2, the liquid is dispersed by the orifices 11, and the energy thereof is decreased when it passes through the orifices 11, and the stream thereof is straightened, thereby it is possible to suppress noise and vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencing / dissipating liquid control device for suppressing noise / vibration which occurs when controlling a liquid to be transferred by inserting a throttle device or the like into a pipeline for transferring a high pressure liquid. .

[0002]

2. Description of the Related Art Conventionally, a pressure reducing valve, a control valve, a restriction orifice, etc. have been used to control the flow rate or pressure of a high pressure liquid transfer pipeline.

The restriction orifice 36 is shown in FIG. 8 and is attached to a return line 22 which returns liquid from the pump 19 to the drum 17 as shown in FIG. In the pipe shown in FIG. 9, a pump 19 is connected to a drum 17 containing water via a delivery pipe 18, and a discharge pipe 20 of the pump 19 is connected to a discharge pipe 21.

When the discharge amount of water from the discharge pipe 21 decreases, the pump 19 is prevented from being damaged due to the closed operation, so that the discharge amount of water of the pump 19 can always be kept at a certain amount or more. As described above, the reflux pipe 22 inserted through the restriction orifice 36 is provided to return a part or all of the water discharged from the pump 19 to the drum 17.

[0005]

The devices such as the pressure reducing valve, the control valve, and the restriction orifice generate noise and vibration when the pressure difference before and after the pressure reduction is large, or when the flow rate change is large. May occur.

The present invention has been made in view of the above matters, and prevents generation of large noise and large vibration when the difference in pressure before and after decompression is large or when the flow rate is largely changed. A technical issue is to provide a sound-deadening / vibrating liquid control device.

[0007]

The present invention has the following constitution in order to solve the above technical problems. That is, a cylindrical main body 2 attached to a liquid transfer pipe is provided, an orifice plate 10 is provided in the cylindrical main body 2, and a plurality of orifices 11 are provided in the orifice plate 10 to disperse liquid energy. And a liquid control device for silencing / vibrating liquid piping for rectifying the flow in the piping.

[0008]

In the sound deadening / vibrating liquid control apparatus of the present invention, the high-pressure liquid that has flowed into the cylindrical body 2 is dispersed into the plurality of orifices 11 provided in the orifice plate 10, so that it passes through each orifice 11. The energy of liquid becomes small. Then, the liquid that collects in one orifice 11 is also in a small range, and the flow in the cylindrical main body 2 is rectified, and generation of large noise and large vibration is suppressed.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 3 show a first embodiment of the present invention and its implementation state.

The muffling / vibration suppressing liquid control apparatus 1 according to the first embodiment divides a steel tubular body 2 at a position slightly closer to one end than a central portion, and then divides the tubular body. After the orifice plate 10 is welded and attached near one end of each of the above, the divided portions are welded to form the connection portions 3, and the flanges 4 are attached by welding to both ends of the tubular body 2. Is.

The tubular body 2 has an inner diameter of 78 mm and a length of 190 mm, and two steel orifice plates 10 provided in the tubular body 2 are, as shown in FIG. Each of the orifices 11 having a diameter of 3.8 mm has 19
It is provided individually.

FIG. 3 shows a pipe line to which the muffling / vibration suppressing liquid control device 1 of the first embodiment is attached. This pipe line connects a delivery pipe 18 to a drum 17 containing water, a pump 19 to the delivery pipe 18, and a discharge pipe 20 of the pump 19 to a discharge pipe 21.

When the amount of water discharged from the discharge pipe 21 is reduced, the pump 19 is prevented from being damaged due to the closed operation, so that the amount of water discharged from the pump 19 can be always maintained at a certain level or more. A recirculation pipe 22 is provided between the discharge pipe 20 and the drum 17, and the sound deadening / vibration suppressing liquid control device 1 is attached to the recirculation pipe 22, and 60 tons of water per hour is discharged to the next system by the discharge pipe 21. It can be transported.

Next, an experimental example in which the sound deadening / vibration suppressing liquid control apparatus 1 of the first embodiment was attached to the conduit shown in FIG. 3, and the limiting orifice 36 was attached to the conduit shown in FIG. A comparative example of the experiments conducted will be described.

In both the experimental example of the first embodiment and the comparative example using the restricted orifice 36, the drum 17 to the pump 19 are both provided.
The water is sucked in and 15 tons of water are silenced in the reflux pipe 22 per hour.
The vibration damping liquid control device 1 or the restriction orifice 36 is passed through to recirculate to the drum 17.

According to the above experiment, at the position A of the delivery pipe 18, in the comparative example using the limiting orifice 36 of the conventional example, the sound is 100.5 decibels and the vibration is 4.6 mm / s at the LO range average. However, in the experimental example using the silencing / vibration suppressing liquid control apparatus 1 according to the embodiment of the present invention,
The sound was 87.5 decibels and the vibration was 0.2 mm / s.

At the position B of the reflux pipe 22,
In the comparative example, the sound was 96 decibels and the vibration was 5.7 mm / s, but in the experimental example, the sound was 87 decibels and the vibration was 2.4.
It was mm / s.

At the position C of the reflux pipe 22, in the comparative example, the sound is 100 decibels and the vibration is 20 mm /
It was s or more and the instrument was shaken out and measurement was impossible, but in the experimental example, sound was 85 decibels and vibration was 1.4 mm / s.

As described above, the experimental example according to the first embodiment of the present invention can significantly reduce sound and vibration as compared with the comparative example according to the conventional example.
Next, a second embodiment of the present invention will be described with reference to FIGS.

A noise / vibration suppressing liquid control apparatus 1 according to this embodiment.
Has a tubular main body 2 formed in a curved tube, and the upstream side has an inner diameter of 10
The diameter is 0 mm, the inner diameter is 150 mm on the downstream side, and the large-diameter flange 4 and the small-diameter flange 4 are attached.

The steel orifice plate 10 welded and attached to the downstream side of the large diameter of the cylindrical body 2 is a disk having a thickness of 3 mm and a diameter of 150 mm, and 211 orifices 11 having a diameter of 5.3 mm. It is provided.

The steel orifice plate 10 attached by welding to the upstream side of the small diameter of the tubular body 2 has a thickness of 3 mm.
At the center of a circular plate having a diameter of 100 mm, one large-diameter orifice 11 having a diameter of 60 mm is provided. At the peripheral edge of the orifice plate 10, an orifice 11 having a diameter of 4.8 mm is provided.
85 are provided, and the interval d between the adjacent orifices 11 at the peripheral portion is about 1 mm. FIG. 7 shows a pipe line to which the muffling / vibration suppressing liquid control device 1 of the second embodiment is attached. In this pipe line, a delivery pipe 18 is connected to a tank 28 containing water, a pump 19 is connected to the delivery pipe 18, and a discharge pipe 20 of the pump 19 is connected to a discharge pipe 21.

For the same reason as in the first embodiment, this pipe is connected to the return pipe 22 between the discharge pipe 20 and the tank 28, controls the minimum flow rate of the pump 19, and protects the pump 19. The system is capable of transferring 400 tons of water per hour to the next system through the discharge pipe 21.

A control valve 29 is attached to the reflux pipe 22.
The control valve 29 is provided with a discharge pipe 21.
It is opened and closed according to a command issued by the flow meter 30 provided in. Next, an example of an experiment in which the sound deadening / vibration suppressing liquid control device 1 of the second embodiment is attached to a position of the conduit of FIG. 7 immediately downstream of the control valve 29, and the sound deadening from the conduit of FIG. A comparative example of an experiment performed by removing the vibration damping liquid control device 1 will be described.

In both the experimental example of the second embodiment and the comparative example, 270 ton / hour of water was refluxed to the tank 28 through the discharge pipe 20 and the reflux pipe 22. According to the experiment, at the position G of the reflux pipe 22 in FIG. 7, the vibration in the comparative example was 5.7 mm / s in the LO range average, but the vibration / silence suppressing liquid control device 1 of the second embodiment was used. In the experimental example used, the vibration was 3.7 mm / s.

At the position H of the reflux pipe 22,
The vibration was 5.4 mm / s in the comparative example, but was 2.2 mm / s in the experimental example. At the position I of the reflux pipe 22, the vibration was 12 mm / s in the comparative example, while the vibration was 3.1 mm / s in the experimental example.

At the position J of the reflux pipe 22, the vibration was 13.4 mm / s in the comparative example, but was 5.0 mm / s in the experimental example. Further, at the position K of the reflux pipe 22, the vibration of the comparative example is 5.2 mm.
/ S, but in the experimental example, the vibration was 2.0 mm / s.

As described above, the experimental example according to the second embodiment can significantly reduce the vibration as compared with the comparative example. Further, in the above two embodiments, the number of the orifice plates 10 is two, but it is also possible to use one, and when the degree of pressure reduction is large, it is three or more. If the number of orifices 11 is plural, the number can be increased or decreased, and the diameter and the number of each orifice 11 of the plural orifice plates 10 can be changed in order.

The orifices 11 can also be formed in a square shape, and the orifices 11 can be arranged in a triangular arrangement or a square arrangement. Further, the pipe body provided on the tubular body 2 may be attached by any other means such as a screw type or a welding type other than the flange 4.

The lengths of the upstream side and the downstream side of the pipe are not particularly limited, and if the liquid transferred in the pipe is also a liquid in the pipe, it can be applied to a gas body at room temperature or the like.
Further, there is no particular limitation on the flow rate / pressure of the liquid, the mounting position of the silencing / vibrating liquid control device 1, and the mounting method.
Further, the material for forming the sound deadening / vibration suppressing liquid control device 1 can also be formed by a material other than steel.

[0031]

According to the present invention, the orifice plate is provided with a plurality of orifices. Therefore, the liquid flowing in the tubular body is dispersed in each orifice, the energy of the liquid passing through each orifice becomes small, and the range of the liquid collected in one orifice becomes a small range. Can be rectified, and the liquid control device in the pipe can be made free of large noise and large vibration.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a front view of the orifice plate according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a state in which the first embodiment of the present invention is attached to a pipeline.

FIG. 4 is a sectional view of a second embodiment of the present invention.

FIG. 5 is a front view of a downstream orifice plate according to a second embodiment of the present invention.

FIG. 6 is a front view of an upstream orifice plate according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a second embodiment of the present invention attached to a pipeline.

FIG. 8 is a perspective view of a restriction orifice of a conventional example.

FIG. 9 is a view showing a state in which a restriction orifice of a conventional example is attached to a pipe line.

[Explanation of symbols]

 1 Muffling / Vibration Liquid Control Device 2 Cylindrical Body 10 Orifice Plate 11 Orifice

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Ishii 9-4, Okudo, Katsushika-ku, Tokyo Z Engineering Co., Ltd.

Claims (1)

[Claims] 1. A sound deadening / vibrating liquid for a liquid pipe in which a tubular body attached to a liquid transfer pipe is provided, an orifice plate is provided in the tubular body, and a plurality of orifices are provided in the orifice plate. Control device.