阅读说明：本技术 频率可调式水管路消声器 (Frequency adjustable water pipeline silencer ) 是由 梅冬生 季振林 肖友洪 严桂芳 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种频率可调式水管路消声器,包括消声器外壳,在所述消声器外壳的两端壁上分别支承有可轴向移动的可调进水穿孔管和可调出水穿孔管；在所述消声器外壳壳腔内固定设置有固定进水穿孔管和固定出水穿孔管,该固定进水穿孔管和固定出水穿孔管通过节流环相互固定连接；固定进水穿孔管套装于可调进水穿孔管上,固定出水穿孔管套装于可调出水穿孔管上；在消声器外壳壳腔内还固定设置有分隔穿孔管,在分隔穿孔管与消声器外壳之间形成外腔,分隔穿孔管的管内侧为膨胀腔。可调进水穿孔管和可调出水穿孔管与消声器外壳对应的支承面上设置有密封件。该消声器具有消声频率可调、流动阻力低的优点。(The invention discloses a frequency-adjustable water pipeline silencer, which comprises a silencer shell, wherein an adjustable water inlet perforated pipe and an adjustable water outlet perforated pipe which can axially move are respectively supported on two end walls of the silencer shell; a fixed water inlet perforated pipe and a fixed water outlet perforated pipe are fixedly arranged in the shell cavity of the silencer shell, and are fixedly connected with each other through a throttling ring; the fixed water inlet perforated pipe is sleeved on the adjustable water inlet perforated pipe, and the fixed water outlet perforated pipe is sleeved on the adjustable water outlet perforated pipe; the silencer shell cavity is also fixedly provided with a separation perforated pipe, an outer cavity is formed between the separation perforated pipe and the silencer shell, and the inner side of the separation perforated pipe is an expansion cavity. Sealing parts are arranged on the bearing surfaces of the adjustable water inlet perforated pipe and the adjustable water outlet perforated pipe corresponding to the silencer shell. The silencer has the advantages of adjustable silencing frequency and low flow resistance.)

1. A frequency-adjustable water pipe muffler comprises a muffler shell (1), and is characterized in that: the two end walls of the silencer shell (1) are respectively supported with an adjustable water inlet perforated pipe (2) and an adjustable water outlet perforated pipe (8) which can move axially; a fixed water inlet perforated pipe (3) and a fixed water outlet perforated pipe (9) are fixedly arranged in a shell cavity of the silencer shell (1), and the fixed water inlet perforated pipe (3) and the fixed water outlet perforated pipe (9) are fixedly connected with each other through a throttling ring (7); the fixed water inlet perforated pipe (3) is sleeved on the adjustable water inlet perforated pipe (2), and the fixed water outlet perforated pipe (9) is sleeved on the adjustable water outlet perforated pipe (8); a separation perforated pipe (4) is fixedly arranged in the shell cavity of the silencer shell (1), an outer cavity (6) is formed between the separation perforated pipe (4) and the silencer shell (1), and an expansion cavity (5) is arranged on the inner side of the separation perforated pipe (4).

2. The frequency tunable water line muffler of claim 1, wherein: the central lines of the adjustable water inlet perforated pipe (2) and the adjustable water outlet perforated pipe (8) are positioned on the central line of the silencer shell (1).

3. The frequency tunable water line muffler of claim 1, wherein: a sealing element (12) is arranged on the supporting surface of the adjustable water inlet perforated pipe (2) corresponding to the silencer shell (1); and a sealing element (12) is also arranged on the supporting surface of the adjustable water outlet perforated pipe (8) corresponding to the silencer shell (1).

4. The frequency tunable water line muffler of claim 3, wherein: the sealing element (12) is an O-shaped sealing ring or/and a lip-shaped sealing ring.

5. The frequency tunable water line muffler of claim 1, wherein: both ends of the silencer shell (1) are provided with positioning screws (11), and the positioning screws (11) correspond to the adjustable water inlet perforated pipe (2) and the adjustable water outlet perforated pipe (8) respectively.

6. The frequency tunable water line muffler of claim 1, wherein: the outer diameter of the throttling ring (7) is equal to the outer diameters of the fixed water inlet perforated pipe (3) and the fixed water outlet perforated pipe (9), and the inner diameter of the throttling ring (7) is smaller than the inner diameters of the adjustable water inlet perforated pipe (2) and the adjustable water outlet perforated pipe (8).

7. The frequency tunable water line muffler of claim 6, wherein: the cross section of the throttle ring (7) is isosceles trapezoid.

8. The frequency tunable water line muffler of claim 1, wherein: the hole diameters of the adjustable water inlet perforated pipe (2) and the fixed water inlet perforated pipe (3) are equal, and the hole diameter of the perforation is 10 mm; the perforation rate is 20%; the perforation apertures on the adjustable water outlet perforated pipe (8) and the fixed water outlet perforated pipe (9) are equal, the perforation aperture is 10mm, and the perforation rate is 20%.

9. The frequency tunable water line muffler of claim 1, wherein: the aperture of the perforations on the separation perforated pipe (4) is 6mm, and the perforation rate of the separation perforated pipe (4) is 20%.

Technical Field

The invention relates to a silencing technical device for a water pipeline, in particular to a silencer for inhibiting dynamic noise of a water pipeline system.

Background

The water pipeline system is widely applied to various industrial devices such as electric power, petrochemical industry and the like, and ships, naval vessels and daily life; vibration noise is a common problem in piping systems. Various degrees of pipeline noise exist on ships and civil ships, such as noise of water inlet and outlet pipelines, noise of ship sea pipes and the like. For a submarine, the pipeline noise problem is particularly prominent due to the narrow space in the submarine, so that the concealment of the ship is influenced, and the marine acoustic environment is greatly influenced.

Under the working condition of various water pumps in a pipeline system, strong hydrodynamic noise is inevitably generated in the pipeline due to the working characteristics of periodic water suction and drainage, and the noise presents obvious characteristics of low-frequency line spectrum and medium-high frequency continuous spectrum. In order to obtain a quieter acoustic environment near the pipe orifice, a silencer needs to be installed on a pipeline, a good silencer design needs to cover a main frequency band with a higher sound level, and the required noise reduction amount is achieved by combining different frequency bands with noise reduction requirements, so that the optimal design in the acoustic sense is realized. In addition, the design of the water pipeline silencer needs to meet the requirement of silencing indexes, and also needs to achieve low flow resistance, meet the requirements of strength and working state in structure and the like.

The existing hydrodynamic muffler mainly adopts an expansion type, resonance type and other resistant muffling structures and an energy accumulator which are evolved from an air muffler, on one hand, because water noise and air noise in a water pipeline have different media, the muffling mechanism of the existing hydrodynamic muffler has great difference, and the air muffler is not completely suitable for water muffling; on the other hand, in a water pipe system, there is medium-high frequency noise in addition to low frequency noise generated by a main noise source such as a pump and a valve, and it is difficult to sufficiently attenuate the low frequency noise by a single noise cancellation mode. Meanwhile, the inherent frequency of the existing hydrodynamic muffler is also fixed and unchanged, and the application range of the muffler is limited, so that the muffler for the water pipeline installed in the existing pipeline is often narrow in muffling frequency band, difficult to cover the noise frequency band with high sound level, and easy to form large flow resistance in the pipeline.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a frequency-adjustable water pipeline silencer which is reasonable in structure and low in flow resistance, and can adjust the silencing frequency and realize broadband silencing.

In order to solve the technical problem, the frequency-adjustable water pipeline silencer comprises a silencer shell, wherein an adjustable water inlet perforated pipe and an adjustable water outlet perforated pipe which can axially move are respectively supported on two end walls of the silencer shell; a fixed water inlet perforated pipe and a fixed water outlet perforated pipe are fixedly arranged in the shell cavity of the silencer shell, and are fixedly connected with each other through a throttling ring; the fixed water inlet perforated pipe is sleeved on the adjustable water inlet perforated pipe, and the fixed water outlet perforated pipe is sleeved on the adjustable water outlet perforated pipe; the silencer shell cavity is also fixedly provided with a separation perforated pipe, an outer cavity is formed between the separation perforated pipe and the silencer shell, and the inner side of the separation perforated pipe is an expansion cavity.

Preferably, the center lines of the adjustable water inlet perforated pipe and the adjustable water outlet perforated pipe are positioned on the center line of the silencer casing.

Preferably, a sealing element is arranged on a bearing surface of the adjustable water inlet perforated pipe corresponding to the silencer shell; and a sealing element is also arranged on the bearing surface of the adjustable water outlet perforated pipe corresponding to the silencer shell.

Preferably, the sealing element is an O-ring or/and a lip-ring.

Preferably, both ends of the muffler shell are provided with positioning screws respectively corresponding to the adjustable water inlet perforated pipe and the adjustable water outlet perforated pipe.

Preferably, the outer diameter of the throttling ring is equal to the outer diameters of the fixed water inlet perforated pipe and the fixed water outlet perforated pipe, and the inner diameter of the throttling ring is smaller than the inner diameters of the adjustable water inlet perforated pipe and the adjustable water outlet perforated pipe.

Preferably, the cross section of the throttle ring is isosceles trapezoid.

Preferably, the perforation apertures on the adjustable water inlet perforated pipe and the fixed water inlet perforated pipe are equal, and the perforation aperture is 10 mm; the perforation rate is 20%; the perforation apertures on the adjustable water outlet perforated pipe and the fixed water outlet perforated pipe are equal, the perforation aperture is 10mm, and the perforation rate is 20%.

Preferably, the perforation hole diameter of the divided perforated tube is 6mm, and the perforation rate of the divided perforated tube is 20%.

In the structure, the adjustable perforated pipe and the fixed perforated pipe which can be axially movably sleeved are arranged at the two ends of the silencer shell, the relative positions of the adjustable perforated pipe and the fixed perforated pipe can be adjusted and locked, the pore overlapping ratio of the two perforated sections can be changed by adjusting the axial relative positions of the adjustable perforated pipe and the fixed perforated pipe, and then the perforation rate and the actual pore size of the whole silencer are changed, so that the perforation impedance is changed, and the acoustic performance of the silencer can be adjusted; when the actual perforation rate of the perforated pipe is lower, the fluid resistance loss of the silencer is smaller, and the effective silencing frequency band is increased along with the increase of the perforation rate; therefore, the overlap ratio of the holes on the perforated pipe is adjusted, the perforation rate of the whole silencer is changed, the silencing frequency of the silencer is further changed, the silencing requirements of different noise frequencies are met, the adjustability of the silencing frequency is high, and broadband hydrodynamic noise can be effectively restrained.

An outer cavity is formed between the separation perforated pipe and the shell of the silencer, and an expansion cavity is formed on the inner side of the separation perforated pipe, so that the silencer forms an expansion structure along a water pipe flow channel, sound waves expand suddenly on the cross section of the pipeline to cause acoustic impedance mutation in the channel, the propagation direction of the sound waves is changed, and reflection and interference phenomena occur in the pipeline, and the silencing of medium and low frequency noise is effectively realized; the separating perforated pipe adopts a pipe wall perforation structure, sound energy is converted into heat energy to be dissipated under the damping action of perforation, noise pulsation is greatly reduced, and the perforation on the expanding perforated pipe generates damping under the action of fluid viscosity, so that high-frequency noise is eliminated.

On one hand, the throttling ring expands through the flow passage of the throttling ring, so that sound waves are suddenly expanded on the section of the throttling ring to cause acoustic impedance mutation in the passage, and the phenomena of reflection and interference occur again in the passage to form secondary medium and low frequency noise elimination; on the other hand, the flow dividing function of the throttling ring forces partial water flow to be divided by a gap flow passage between the adjustable perforated pipe and the fixed perforated pipe and an inner hole flow passage of the throttling ring respectively, so that the flow speed of the water flow is greatly reduced, the pressure of the water flow is reduced, and the secondary noise generated by jet flow is effectively inhibited. The silencer adopts a straight-through structure, so that the flow resistance is low, and sundries in the pipe can be conveniently cleaned, thereby realizing broadband silencing of high, medium and low frequency bands.

Drawings

The frequency tunable water line muffler of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic cross-sectional view of a frequency tunable water pipe muffler according to an embodiment of the present invention.

In the figure, 1-silencer shell, 2-adjustable water inlet perforated pipe, 3-fixed water inlet perforated pipe, 4-separation perforated pipe, 5-expansion cavity, 6-outer cavity, 7-throttling ring, 8-adjustable water outlet perforated pipe, 9-fixed water outlet perforated pipe, 10-water outlet pipe flange, 11-positioning screw, 12-sealing piece and 13-water inlet pipe flange.

Detailed Description

As shown in fig. 1, the muffler shell 1 of the frequency adjustable water pipe muffler is composed of a circular pipe section and two end plates, and the circular pipe section and the end plates are fixedly connected with each other by welding to form a muffler shell casing. The adjustable water inlet perforated pipe 2 and the adjustable water outlet perforated pipe 8 of the circular pipe structure respectively penetrate through end plates at the front end and the rear end of the silencer shell 1 and are supported on wall plates at two ends of the silencer shell 1, and the extending ends of the adjustable water inlet perforated pipe 2 and the adjustable water outlet perforated pipe 8 are respectively and fixedly provided with a water outlet pipe flange 10 and a water inlet pipe flange 13 so as to connect the silencer in series on a water pipeline. The center lines of the adjustable water inlet perforated pipe 2 and the adjustable water outlet perforated pipe 8 are positioned on the center line of the silencer shell 1.

The pipe walls of the extending ends of the adjustable water inlet perforated pipe 2 and the adjustable water outlet perforated pipe 8 extending into the shell cavity of the silencer shell 1 are provided with perforations, the perforation apertures of the adjustable water inlet perforated pipe 2 and the adjustable water outlet perforated pipe 8 are equal, and the perforation apertures are both 10 mm; the perforation rates were all 20%. The adjustable water inlet perforated pipe 2 is movably supported on a corresponding supporting surface of the silencer casing 1, and a sealing member 12 is arranged on the supporting surface; the outlet-adjustable perforated pipe 8 is also mounted movably on a corresponding bearing surface of the muffler shell 1, on which a sealing element 12 is also arranged. The sealing element 12 is two O-ring seals, or two lip-ring seals, or one O-ring seal and one lip-ring seal. The two ends of the silencer shell body 1 are provided with positioning screws 11, the positioning screws 11 are positioned at corresponding positions of the supporting surfaces of the adjustable water inlet perforated pipe 2 and the adjustable water outlet perforated pipe 8, the positioning screws 11 respectively correspond to the adjustable water inlet perforated pipe 2 and the adjustable water outlet perforated pipe 8, the adjustable water inlet perforated pipe 2 or the adjustable water outlet perforated pipe 8 can be moved along the axial direction by loosening the positioning screws 11, and the adjustable water inlet perforated pipe 2 and the adjustable water outlet perforated pipe 8 can be locked on the silencer shell body 1 by locking the positioning screws 11.

A fixed water inlet perforated pipe 3 and a fixed water outlet perforated pipe 9 are fixedly arranged in a shell cavity of the silencer shell 1, and the fixed water inlet perforated pipe 3 and the fixed water outlet perforated pipe 9 are fixedly connected with each other through a throttling ring; the fixed water inlet perforated pipe 3, the fixed water outlet perforated pipe 9 and the throttle ring 7 are positioned on the same axis, and the fixed water inlet perforated pipe 3 and the fixed water outlet perforated pipe 9 are respectively and fixedly connected to two sides of the throttle ring 7. The outer diameter of the throttle ring 7 is equal to the outer diameters of the fixed water inlet perforated pipe 3 and the fixed water outlet perforated pipe 9, the inner diameter of the throttle ring 7 is smaller than the inner diameters of the adjustable water inlet perforated pipe 2 and the adjustable water outlet perforated pipe 8, and the cross section of the throttle ring 7 is in an isosceles trapezoid shape. The configuration of the restrictor ring 7 directs fluid from the front section bore into the expansion chamber, while the inclined trapezoidal waist reduces the flow resistance of the fluid.

The fixed water inlet perforated pipe 3 is sleeved on the adjustable water inlet perforated pipe 2, and the fixed water outlet perforated pipe 9 is also sleeved on the adjustable water outlet perforated pipe 8; the relative sleeving position of the adjustable water inlet perforated pipe 2 and the fixed water inlet perforated pipe 3 is adjusted along the axial direction, so that the actual aperture size of the adjustable water inlet perforated pipe 2 and the actual aperture size of the fixed water inlet perforated pipe 3 can be changed; the relative sleeving position of the adjustable water outlet perforated pipe 8 and the fixed water outlet perforated pipe 9 is adjusted by moving in the axial direction, so that the actual aperture size of the adjustable water outlet perforated pipe 8 and the fixed water outlet perforated pipe 9 can be changed. The perforation apertures on the adjustable water inlet perforated pipe 2 and the fixed water inlet perforated pipe 3 are equal, and the perforation aperture is 10 mm; the perforation rate is 20%; the hole diameters of the adjustable water outlet perforated pipe 8 and the fixed water outlet perforated pipe 9 are also equal, the hole diameter is also 10mm, and the perforation rate is 20%.

A separation perforated pipe 4 is fixedly arranged in the shell cavity of the silencer shell 1, an outer cavity 6 is formed between the separation perforated pipe 4 and the silencer shell 1, and an expansion cavity 5 is arranged on the inner side of the separation perforated pipe 4. The perforation diameter of the divided perforated tube 4 was 6mm, and the perforation rate of the divided perforated tube 4 was 20%.