Flow-induced noise detection device for self-suction sewage pump pipeline

Abstract

The invention discloses a flow-induced noise detection device for a self-suction sewage pump pipeline. Comprising a perforated plate pipe sleeve, a hydrophone fixing pipe, a buckle, a sleeve, a hydrophone fixing sleeve, an O-shaped ring, a pressing sleeve, a hydrophone, a gasket, a spring, a sealing ring, sound insulation cotton, a sound insulation rubber ring and a pipeline threaded connector. The hydrophone is fixed on the outer side of the pipeline through the hydrophone fixing sleeve, and interference of external noise on the hydrophone is reduced through the axial damping spring buckle device and the sound insulation cotton filled in the inner cavity. According to the hydrophone, interference of fluid flowing is avoided during measurement, noise of a boundary layer is reduced, and due to the fact that the nylon sleeve is in non-rigid connection with the connecting sleeve and the pressing sleeve, the influence of vibration of a pipeline system on signal collection of the hydrophone is greatly reduced. According to the invention, the measurement is reliable, the sealing performance is good, and the influence of axial movement is small; and through threaded connection, mounting and dismounting are convenient.

Description

Technical Field

[0001] The invention relates to the field of flow-induced noise detection, and in particular to a flow-induced noise detection device for a self-priming sewage pump pipeline. Background Art

[0002] Sewage pumps are important fluid conveying equipment in cities, but they generate flow-induced noise during operation. How to accurately measure the characteristics of their sound sources is the key to achieving noise reduction design for the entire pipeline system. The common methods for measuring flow-induced noise in pumps currently include direct method, indirect method and pipeline measurement method. This device is aimed at the pipeline measurement method. However, for a long time, the installation and positioning problems of hydrophones on pipelines have not been well solved. When the hydrophone is installed in the pipeline, it will be impacted by the fluid, which will cause measurement errors. When the hydrophone is installed flush on the pipeline, it will also cause large noise errors on the outside of the pipe wall. Both installation and measurement methods have certain errors. The error in flow-induced noise measurement mainly comes from the vibration of the pipe wall and the environmental noise caused by the operating environment of the sewage pump. Therefore, the development of a reliable hydrophone fixed detection device is necessary to provide reliable experimental data for the measurement of the sound source characteristics of sewage pumps. Summary of the invention

[0003] In view of the deficiencies in the prior art, an object of the present invention is to provide a flow-induced noise detection device for a self-priming sewage pump pipeline.

[0004] The object of the present invention is achieved through the following technical solutions: A flow-induced noise detection device for a self-priming sewage pump pipeline, comprising: a porous plate pipe sleeve, a hydrophone fixing pipe, a buckle, a sleeve, a hydrophone fixing sleeve, a compression sleeve, a hydrophone, a gasket, a sound insulation cotton and a pipeline threaded joint;

[0005] The porous plate tube sleeve is connected to the sewage pump pipeline; the hydrophone fixing tube is fixedly connected to the porous plate tube sleeve, and sound insulation cotton is arranged between the hydrophone fixing tube and the sewage pump pipeline; a buckle groove is arranged on the side of the hydrophone fixing tube; a buckle is arranged on the sleeve, and the sleeve is connected to the buckle groove of the hydrophone fixing tube through the buckle; a boss is arranged inside the sleeve, and the hydrophone fixing sleeve and the gasket are arranged in the boss; the hydrophone is fixed by the hydrophone fixing sleeve, and the front end of the hydrophone is threadedly connected to the sewage pump pipeline through the pipeline threaded joint, and a sound insulation rubber ring is arranged on the outside of the pipeline threaded joint to isolate part of the noise; the compression sleeve is fixedly connected to the sleeve.

[0006] Furthermore, the porous plate pipe sleeve is connected to the sewage pump pipeline by bolts, which is convenient for disassembly.

[0007] Furthermore, circular through holes are evenly distributed on the porous plate sleeve.

[0008] Furthermore, a spring is provided at the bottom of the hydrophone fixing tube to eliminate the influence of the axial movement of the pipeline on the flow-induced noise.

[0009] Furthermore, the buckle is fixed to the sleeve by screws, and four buckle grooves are provided on the side of the hydrophone fixing tube, which is convenient for installation and disassembly, and when disassembling, it is only necessary to push the sleeve inward and rotate it clockwise.

[0010] Furthermore, a sealing ring is provided between the sleeve and the buckle to absorb vibration and impact force, thereby reducing vibration and noise transmitted to the surrounding environment.

[0011] Furthermore, the hydrophone fixing sleeve is connected to the sleeve by threads, so as to facilitate adjustment of the distance between the hydrophone and the pipeline.

[0012] Furthermore, the hydrophone fixing sleeve and the sleeve are made of copper, and the wall thickness is greater than 5 mm to avoid forming a large acoustic impedance and isolate the interference of external noise on the hydrophone; the inner side of the hydrophone fixing sleeve is made of nylon, which is convenient for fixing the hydrophone, and a flexible connection is used to reduce the interference of vibration on the measurement.

[0013] Furthermore, the material of the compression sleeve is aluminum to reduce the weight of the device; a cavity is left inside the compression sleeve for filling sound insulation material and fixing the hydrophone connection line.

[0014] Furthermore, the compression sleeve is connected to the sleeve by threads and is a transition fit, and an "O" ring is provided on the inner side to form an axial seal.

[0015] The beneficial effects of the present invention are: the hydrophone of the present invention has no interference from fluid flow during measurement, and reduces the generation of boundary layer noise. Since the contact between the nylon sleeve and the connecting sleeve and the compression sleeve is a non-rigid connection, the influence of the pipeline system vibration on the hydrophone signal collection is also greatly reduced. The present invention not only has reliable measurement, good sealing, and little influence from axial movement; and through threaded connection, it is convenient to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the flow noise detection device of the present invention;

[0017] Figure 2 It is a schematic diagram of the AA cross-section structure of the flow noise detection device of the present invention;

[0018] Figure 3 It is a three-dimensional axonometric drawing of the present invention.

[0019] In the figure: 1. porous plate sleeve, 2. hydrophone fixing tube, 3. buckle, 4. sleeve, 5. hydrophone fixing sleeve, 6. "O" ring, 7. compression sleeve, 8. hydrophone, 9. gasket, 10. spring, 11. sealing ring, 12. sound insulation cotton, 13. sound insulation rubber ring, 14. pipe threaded joint. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a flow-induced noise detection device for a self-priming sewage pump pipeline, comprising: a porous plate sleeve 1, a hydrophone fixing tube 2, a buckle 3, a sleeve 4, a hydrophone fixing sleeve 5, a pressing sleeve 7, a hydrophone 8, a gasket 9, a spring 10, a sealing ring 11, sound insulation cotton 12, a sound insulation rubber ring 13, and a pipeline threaded joint 14.

[0022] The porous plate sleeve 1 is connected to the sewage pump pipeline by bolts, which is convenient for disassembly; Figure 3 As shown, the porous plate tube sleeve 1 is evenly distributed with vibration-damping and sound-absorbing holes to reduce the interference of external noise on the hydrophone 8. The hydrophone fixing tube 2 is fixedly connected to the porous plate tube sleeve 1, and a sound insulation cotton 12 is arranged between the hydrophone fixing tube 2 and the sewage pump pipeline; a spring 10 is arranged at the bottom of the hydrophone fixing tube 2 to eliminate the influence of the axial movement of the pipeline on the flow-induced noise; four buckle grooves are arranged on the side of the hydrophone fixing tube 2; a buckle 3 is fixed on the sleeve 4 by screws, and the sleeve 4 is connected to the buckle groove of the hydrophone fixing tube 2 by the buckle 3, which is convenient for installation and disassembly, and when disassembling, the sleeve only needs to be pushed inward and rotated clockwise. A boss is provided inside the sleeve 4, and the hydrophone fixing sleeve 5 and the gasket 9 are arranged in the boss. The hydrophone fixing sleeve 5 is connected to the sleeve 4 by threads, so as to adjust the distance between the hydrophone 8 and the pipeline; the hydrophone 8 is fixed by the hydrophone fixing sleeve 5, and the hydrophone 8 is connected to the pipeline threaded joint 14 by the threads at the front end of the hydrophone, and the pipeline threaded joint 14 is covered with a sound insulation rubber ring 13 on the outside; the pressing sleeve 7 is connected to the sleeve 4 by threads, and is a transition fit, and an "O" ring 6 is provided on the inside to form an axial seal.

[0023] The hydrophone fixing sleeve 5 and sleeve 4 are made of copper, and the wall thickness is greater than 5mm to avoid forming a large acoustic impedance and isolate the interference of external noise on the hydrophone 8; the inner side of the hydrophone fixing sleeve 5 is made of nylon, which is convenient for fixing the hydrophone 8, and the flexible connection is used to reduce the interference of vibration on the measurement. The material of the pressure sleeve 7 is aluminum to reduce the weight of the device; a cavity is left inside the pressure sleeve 7 for filling the sound insulation material and fixing the hydrophone connection line.

[0024] The working process of the present invention is as follows: the hydrophone 8 is threadedly connected to the pipeline threaded joint 14, and a soundproof rubber ring 13 is sleeved on the outside of the pipeline threaded joint 14. The flow-induced noise signal in the pipeline is collected by the signal collection component at the front end of the hydrophone 8. The hydrophone fixing tube 2 is connected to the porous plate sleeve 1, and a soundproof cotton 12 is arranged between the hydrophone fixing tube 2 and the sewage pump pipeline to absorb the noise generated by the vibration of part of the pipeline during measurement. A spring 10 is arranged at the bottom of the hydrophone fixing tube 2 to eliminate the influence of the axial movement of the pipeline on the flow-induced noise. The spring 10 is installed between the hydrophone fixing sleeve 5 and the hydrophone fixing tube 2, and the influence of the vibration of the pipeline system is greatly reduced through the elastic connection. And there is a sealing ring 11 between the sleeve 4 and the buckle 3 to reduce the influence of external noise. The material of the hydrophone fixing sleeve 5 and the sleeve 4 is copper, and the wall thickness is greater than 5mm to avoid forming a large acoustic impedance and isolate the interference of external noise on the hydrophone. The inner side of the hydrophone fixing sleeve 5 is made of nylon to protect the hydrophone 8 from being easily damaged. A cavity is left inside the compression sleeve 7 for filling sound insulation materials and fixing the hydrophone connection line. The hydrophone signal is converted and input into the virtual instrument driver through the signal acquisition instrument, and the time domain waveform, sound pressure level and octave information are obtained after a series of data processing.

[0025] The contents described in the embodiments of this specification are merely an enumeration of implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also includes equivalent technical means that can be thought of by those skilled in the art based on the inventive concept.

Claims

1. A flow-induced noise detection device for a self-priming sewage pump pipeline, characterized in that: include: Perforated plate sleeves, hydrophone fixing tubes, clips, sleeves, hydrophone fixing sleeves, compression sleeves, hydrophones, gaskets, pipe threaded joints and sound insulation cotton; The porous plate tube sleeve is connected to the sewage pump pipeline; the hydrophone fixing tube is fixedly connected to the porous plate tube sleeve, and sound insulation cotton is arranged between the hydrophone fixing tube and the sewage pump pipeline; a buckle groove is arranged on the side of the hydrophone fixing tube; a buckle is arranged on the sleeve, and the sleeve is connected to the buckle groove of the hydrophone fixing tube through the buckle; a boss is arranged inside the sleeve, and the hydrophone fixing sleeve and the gasket are arranged in the boss; the hydrophone is fixed by the hydrophone fixing sleeve, and the front end of the hydrophone is threadedly connected to the sewage pump pipeline through the pipeline threaded joint, and a sound insulation rubber ring is arranged on the outside of the pipeline threaded joint; the compression sleeve is fixedly connected to the sleeve.

2. A flow-induced noise detection device for a self-priming sewage pump pipeline according to claim 1, characterized in that: The porous plate pipe sleeve is connected to the sewage pump pipeline through bolts.

3. A flow-induced noise detection device for a self-priming sewage pump pipeline according to claim 1, characterized in that: The perforated plate sleeve is evenly distributed with circular through holes.

4. A flow-induced noise detection device for a self-priming sewage pump pipeline according to claim 1, characterized in that: A spring is provided at the bottom of the hydrophone fixing tube to eliminate the axial movement of the pipeline.

5. A flow-induced noise detection device for a self-priming sewage pump pipeline according to claim 1, characterized in that: The buckle is fixed to the sleeve by screws, and four buckle grooves are arranged on the side of the hydrophone fixing tube, which is convenient for installation and disassembly, and when disassembling, only the sleeve needs to be pushed inward and rotated clockwise.

6. A flow-induced noise detection device for a self-priming sewage pump pipeline according to claim 1, characterized in that: A sealing ring is provided between the sleeve and the buckle to absorb vibration and impact force.

7. A flow-induced noise detection device for a self-priming sewage pump pipeline according to claim 1, characterized in that: The hydrophone fixing sleeve is connected to the sleeve by threads, so as to facilitate the adjustment of the distance between the hydrophone and the pipeline.

8. A flow-induced noise detection device for a self-priming sewage pump pipeline according to claim 1, characterized in that: The hydrophone fixing sleeve and the sleeve are made of copper, and the wall thickness is greater than 5 mm; the inner side of the hydrophone fixing sleeve is made of nylon, which is convenient for fixing the hydrophone, and the flexible connection is used to reduce the interference of vibration on the measurement.

9. A flow-induced noise detection device for a self-priming sewage pump pipeline according to claim 1, characterized in that: The material of the compression sleeve is aluminum to reduce the weight of the device; a cavity is reserved inside the compression sleeve for filling sound insulation material and fixing the hydrophone connection line.

10. A flow-induced noise detection device for a self-priming sewage pump pipeline according to claim 1, characterized in that: The compression sleeve is connected to the sleeve by threads, and an O-ring is arranged inside to form an axial seal.

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