Vibration and noise reduction device used in natural gas reducing pipeline

Abstract

The vibration and noise reduction device comprises an outer cylinder and an inner cylinder embedded in the outer cylinder, a plurality of rows of outer through holes are evenly distributed in the outer cylinder, and a plurality of rows of inner through holes corresponding to the outer through holes are evenly distributed in the inner cylinder. The positions of the outer through holes in each row in the outer cylinder and the positions of the inner through holes in each row in the inner cylinder are arranged in a staggered mode. Natural gas flow enters from the inner cylinder and flows to the outer cylinder, through staggered arrangement of the outer through holes and the inner through holes and a proper gap distance between the inner cylinder and the outer cylinder, high-speed natural gas flow is diffracted and scattered when passing through the double-layer hole structure, turbulent kinetic energy is dissipated, so that the flow speed is reduced, and a flow field of the natural gas flow is rapidly homogenized in the reducer pipe; and the impact load of airflow on the pipe wall of the variable-diameter pipeline is reduced, so that vibration and noise generated by vibration are reduced, and the safe service life of equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas pipelines, and in particular to a vibration and noise reduction device used in a natural gas variable diameter pipeline. Background Art

[0002] The pressure regulating process section of the natural gas distribution station, which consists of a pressure regulating valve and a reducer, is a large-scale key equipment in the natural gas distribution station. The natural gas in the upstream pipeline passes through the pressure regulating valve and the reducer, which is a coarse and fine structure, causing the Laval effect. In particular, the pressure difference of the gas expansion increases after the reducer becomes thicker, which will accelerate the natural gas flow to subsonic speed or even higher. Shock waves are formed in the reducer, and the turbulent kinetic energy increases sharply. During the natural gas distribution process, the temperature at the pressure reducing valve drops sharply due to the throttling effect. Under high pressure and low temperature conditions, solid particles such as natural gas hydrates and natural gas impurities impact the valve core and the pipe wall with high-speed airflow, causing excessive vibration and noise in the entire gas supply branch, with a vibration speed of more than 400m / s and a noise of more than 120 decibels. Not only does it erode the equipment in the pipe, but it also causes the vibration fatigue load of the entire pipeline to increase, reducing the safe service life of the equipment. In addition, strong noise pollution seriously affects the physical and mental health of station staff and residents in adjacent residential areas.

[0003] Therefore, it is necessary to use a built-in pipeline flow stabilization, vibration reduction and noise reduction device to dissipate the kinetic energy of the airflow at the reducer in the natural gas pipeline step by step, reduce the impact load and the erosion force of solid particles, and thus achieve the effect of vibration reduction, noise reduction and anti-erosion. Summary of the invention

[0004] In view of the above problems in the prior art, the present invention provides a vibration reduction and noise reduction device for a natural gas variable diameter pipeline, which solves the problem that the existing natural gas flow causes strong vibration when entering the variable diameter pipeline, thereby reducing the safe service life of the equipment.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] Provided is a vibration reduction and noise reduction device for use in a natural gas variable diameter pipeline, comprising an outer cylinder and an inner cylinder embedded in the outer cylinder, the outer cylinder being evenly provided with a plurality of rows of outer through holes, the inner cylinder being evenly provided with a plurality of rows of inner through holes corresponding to the plurality of rows of outer through holes, and the positions of each row of outer through holes on the outer cylinder being staggered with the positions of each row of inner through holes on the inner cylinder.

[0007] Furthermore, the outer through holes include a plurality of rows of first outer holes arranged on the outer cylinder body and a plurality of rows of second outer holes arranged on the rear end of the outer cylinder;

[0008] The inner through holes include a plurality of rows of first inner holes arranged on the inner tube body and a plurality of rows of second inner holes arranged on the rear end of the inner tube;

[0009] The tail end of the outer tube and the tail end of the inner tube are both hemispherical.

[0010] Furthermore, the first outer hole and the first inner hole are both arranged obliquely, and the inclination angle is 30°-90°, and the inclination directions of the first outer hole and the first inner hole are opposite.

[0011] Furthermore, a gap layer is provided between the outer cylinder and the inner cylinder, and the width of the gap layer is 2 mm-10 mm.

[0012] Furthermore, a positioning step is provided on the circumference of the inner wall of the outer cylinder, and a positioning groove matching the positioning step is provided on the outer wall of the inner cylinder.

[0013] Furthermore, the total flow area of ​​the plurality of rows of external through holes is greater than the flow area of ​​the inner cylinder inlet.

[0014] Furthermore, the total flow area of ​​the through holes in the multiple rows is larger than the flow area of ​​the inner cylinder inlet.

[0015] Furthermore, a flange is arranged on the outside of the inlet end of the outer cylinder.

[0016] The invention discloses a vibration reduction and noise reduction device for use in a natural gas variable diameter pipeline, which has the following beneficial effects:

[0017] 1. In the present invention, the natural gas flow enters the inner cylinder and flows to the outer cylinder. The staggered arrangement of the outer through holes and the inner through holes deflects the flow path of the natural gas flow, thereby reducing the flow velocity, making the central flow velocity and the peripheral flow velocity of the natural gas flow uniform, reducing turbulent impact, and further reducing the impact load on the wall of the variable diameter pipeline, thereby reducing vibration and the noise generated by vibration, and extending the safe service life of the equipment.

[0018] 2. The first outer hole and the first inner hole in the present invention are both arranged obliquely, and the inclination directions of the first outer hole and the first inner hole are opposite, thereby further deflecting the flow path of the natural gas flow, reducing the flow velocity of the natural gas flow, and reducing the impact load on the wall of the variable diameter pipeline.

[0019] 3. The tail end of the outer tube and the tail end of the inner tube in the present invention are both hemispherical in design, which reduces the micro-cutting effect caused by the vertical impact of the natural gas flow on the metal surface, reduces the turbulent impact at the tail of the outer tube and the inner tube; and reduces the erosion of the surface material caused by the accumulation of impurities in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic structural diagram of a vibration and noise reduction device used in a natural gas variable diameter pipeline.

[0021] Figure 2 For the present invention Figure 1 Schematic diagram of the cross section at AA in the middle.

[0022] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at B in the figure.

[0023] Figure 4 It is a schematic diagram of the staggered first outer hole and the first inner hole of the present invention.

[0024] Figure 5 It is a schematic structural diagram of the first outer hole of the present invention.

[0025] Figure 6 It is a schematic structural diagram of the first inner hole of the present invention.

[0026] Among them, 1. outer cylinder; 11. positioning step; 12. flange; 2. inner cylinder; 21. positioning slot; 3. outer through hole; 31. first outer hole; 32. second outer hole; 4. inner through hole; 41. first inner hole; 42. second inner hole; 5. gap layer. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are described to facilitate those skilled in the art to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0028] refer to Figure 1-Figure 6 , which is a structural schematic diagram of a vibration reduction and noise reduction device used in a natural gas variable diameter pipeline in this embodiment, and its purpose is to solve the problem that the existing natural gas flow causes strong vibration when entering the variable diameter pipeline, thereby reducing the safe service life of the equipment. The specific structure of this embodiment will be described in detail below.

[0029] A vibration and noise reduction device for a natural gas variable diameter pipeline comprises an outer cylinder 1 and an inner cylinder 2, wherein the inner cylinder 2 is embedded in the outer cylinder 1.

[0030] Among them, multiple rows of external through holes 3 are evenly distributed on the outer cylinder 1, and multiple rows of internal through holes 4 corresponding to the multiple rows of external through holes 3 are evenly distributed on the inner cylinder 2. The position of each row of external through holes 3 on the outer cylinder 1 and the position of each row of internal through holes 4 on the inner cylinder 2 are staggered.

[0031] Specifically, a positioning step 11 is provided on the circumference of the inner wall of the outer cylinder 1, a positioning groove 21 matching the positioning step 11 is provided on the outer wall of the inner cylinder 2, a flange 12 is provided on the outer side of the inlet end of the outer cylinder 1, and a gap layer 5 is provided between the outer cylinder 1 and the inner cylinder 2, and the width of the gap layer 5 is 2mm-10mm.

[0032] In this embodiment, the position of the inner tube 2 embedded in the outer tube 1 is determined by the cooperation of the positioning step 11 and the positioning groove 21. After the position is determined, the entrances of the outer tube 1 and the inner tube 2 are welded to complete the connection between the outer tube 1 and the inner tube 2. Then, the device is installed at the entrance of the variable diameter pipe through the flange 12. Under the impact of the natural gas flow, the outer tube 1 and the inner tube 2 are connected more tightly.

[0033] The natural gas flow entering the variable diameter pipeline first enters the inner cylinder 2 and then flows to the outer cylinder 1. The staggered arrangement of the outer through holes 3 and the inner through holes 4 deflects the flow path of the natural gas flow, thereby reducing the flow velocity, making the central and peripheral flow velocities of the natural gas flow uniform, reducing turbulent impact, and reducing the impact load on the wall of the variable diameter pipeline, thereby reducing vibration and noise generated by vibration and extending the safe service life of the equipment.

[0034] Specifically, the outer through hole 3 includes a plurality of rows of first outer holes 31 arranged on the body of the outer tube 1 and a plurality of rows of second outer holes 32 arranged on the tail end of the outer tube 1; the inner through hole 4 includes a plurality of rows of first inner holes 41 arranged on the body of the inner tube 2 and a plurality of rows of second inner holes 42 arranged on the tail end of the inner tube 2; the tail ends of the outer tube 1 and the inner tube 2 are both hemispherical.

[0035] In this embodiment, the tail end of the outer cylinder 1 and the tail end of the inner cylinder 2 are designed to be hemispherical. The hemispherical design reduces the micro-cutting effect caused by the vertical impact of the natural gas flow on the metal surface of the tail end of the outer cylinder 1 and the tail end of the inner cylinder 2, reduces the turbulent impact on the tail of the outer cylinder 1 and the inner cylinder 2, reduces the erosion of the surface material caused by the accumulation of impurities in the pipeline, and prevents the tail of the outer cylinder 1 and the inner cylinder 2 from being damaged by long-term impact, causing damage and falling off.

[0036] Specifically, the first outer hole 31 and the first inner hole 41 are both arranged obliquely, and the inclination angle is 30°-90°, and the inclination directions of the first outer hole 31 and the first inner hole 41 are opposite.

[0037] In this embodiment, the first outer hole 31 and the first inner hole 41 are arranged obliquely and in opposite directions. For example, the first outer hole 31 has an inclination angle of +30°, +45°, +60°, and +90°, while the first inner hole 41 has an inclination angle of -30°, -45°, -60°, and -90°. Thus, the arrangement in opposite directions further deflects the flow path of the natural gas flow multiple times, thereby reducing the flow rate of the natural gas flow.

[0038] At the same time, the first outer hole 31 is inclined toward the rear end of the outer tube 1, thereby reducing the impact load on the wall of the variable diameter pipeline.

[0039] Specifically, a gap layer 5 is provided between the outer tube 1 and the inner tube 2, and the width of the gap layer 5 is 2 mm-10 mm.

[0040] In this embodiment, a gap layer 5 is left between the outer tube 1 and the inner tube 2. The width of the gap layer 5 can be designed according to actual needs. The gap layer 5 buffers the natural gas flow out of the inner tube 2 to reduce the flow rate.

[0041] Specifically, the total flow area of ​​the multiple rows of outer through holes 3 is larger than the flow area of ​​the inlet of the inner tube 2 , and the total flow area of ​​the multiple rows of inner through holes 4 is larger than the flow area of ​​the inlet of the inner tube 2 .

[0042] In this embodiment, the number and diameter of the first outer holes 31 and the second outer holes 32 can be set as needed. The diameter of the first outer holes 31 and the second outer holes 32 is greater than 10 mm. The sum of the areas of multiple rows of first outer holes 31 and multiple rows of second outer holes 32 is the sum of the flow areas of multiple rows of external through holes 3. The sum of the flow areas through multiple rows of external through holes 3 is greater than the flow area of ​​the inlet of the inner tube 2, ensuring that the natural gas flow through the outer tube 1 will not be reduced.

[0043] The number and diameter of the first inner holes 41 and the second inner holes 42 can be set as needed. The diameter of the first inner holes 41 and the second inner holes 42 is greater than 10 mm. The sum of the areas of the multiple rows of first inner holes 41 and the multiple rows of second inner holes 42 is the sum of the flow areas of the multiple rows of through holes 4. The sum of the flow areas of the multiple rows of through holes 4 is greater than the flow area of ​​the inlet of the inner tube 2, ensuring that the natural gas flow through the inner tube 2 will not be reduced.

[0044] Although the specific implementation of the invention is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A vibration and noise reduction device for use in a natural gas variable diameter pipeline, characterized in that: It comprises an outer cylinder (1) and an inner cylinder (2) embedded in the outer cylinder (1); The outer cylinder (1) is evenly provided with multiple rows of external through holes (3), and the inner cylinder (2) is evenly provided with multiple rows of internal through holes (4) corresponding to the multiple rows of external through holes (3). The positions of each row of the outer through holes (3) on the outer cylinder (1) and the positions of each row of the inner through holes (4) on the inner cylinder (2) are arranged alternately.

2. The vibration and noise reduction device for use in a natural gas variable diameter pipeline according to claim 1, characterized in that: The outer through holes (3) include a plurality of rows of first outer holes (31) arranged on the body of the outer cylinder (1) and a plurality of rows of second outer holes (32) arranged on the rear end of the outer cylinder (1); The inner through holes (4) include a plurality of rows of first inner holes (41) arranged on the body of the inner tube (2) and a plurality of rows of second inner holes (42) arranged on the tail end of the inner tube (2); The tail end of the outer cylinder (1) and the tail end of the inner cylinder (2) are both hemispherical.

3. The vibration and noise reduction device for use in a natural gas variable diameter pipeline according to claim 2 is characterized in that: The first outer hole (31) and the first inner hole (41) are both arranged obliquely, and the inclination angle is 30°-90°, and the inclination directions of the first outer hole (31) and the first inner hole (41) are opposite.

4. The vibration and noise reduction device for use in a natural gas variable diameter pipeline according to claim 1, characterized in that: A gap layer (5) is provided between the outer cylinder (1) and the inner cylinder (2), and the width of the gap layer (5) is 2 mm to 10 mm.

5. The vibration and noise reduction device for use in a natural gas variable diameter pipeline according to claim 4 is characterized in that: A positioning step (11) is provided on the circumference of the inner wall of the outer cylinder (1), and a positioning groove (21) that fits with the positioning step (11) is provided on the outer wall of the inner cylinder (2).

6. The vibration and noise reduction device for use in a natural gas variable diameter pipeline according to claim 1, characterized in that: The total flow area of ​​the multiple rows of external through holes (3) is greater than the flow area of ​​the inlet of the inner cylinder (2).

7. The vibration and noise reduction device for use in a natural gas variable diameter pipeline according to claim 1, characterized in that: The total flow area of ​​the multiple rows of inner through holes (4) is greater than the flow area of ​​the inlet of the inner cylinder (2).

8. The vibration and noise reduction device for use in a natural gas variable diameter pipeline according to claim 1, characterized in that: A flange (12) is provided on the outside of the inlet end of the outer cylinder (1).

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