CN115243184A

CN115243184A - Acoustic lining measuring device

Info

Publication number: CN115243184A
Application number: CN202210780683.1A
Authority: CN
Inventors: 廖峻锋; 邱祥海; 杜林�; 景晓东; 孙晓峰
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-10-25

Abstract

The invention provides an acoustic liner measuring device, relates to the technical field of acoustic measurement, and solves the technical problems of poor applicability, complex assembly and disassembly, easy damage to a microphone, sealing under high-speed flow and poor accuracy. The acoustic liner measuring device comprises a pipeline, a casing and a mounting seat. The casing can be provided with an acoustic liner, so that the perforated surface of the acoustic liner is flush with the first inner wall of the pipeline; the casing is formed integrally, and a sealing ring groove is arranged at the joint of the casing and the pipeline, so that high-sealing performance of preventing high-speed flow in the pipeline from leaking is achieved. The first cavity and the second cavity of the mounting seat are provided with a first cavity for the microphone to pass through, so that the static pressure hole of the microphone is communicated with the inside of the pipe to ensure the measurement accuracy; the first tool clamps the microphone, and the microphone is conveniently and rapidly assembled and disassembled to the second tool arranged on the second wall surface without damaging the microphone, so that the receiving end of the microphone is flush with the second inner wall of the pipeline; each connection is treated with high sealing properties. The acoustic liner measuring device has the advantages of high applicability, high sealing and accuracy, and no damage to convenient disassembly and assembly.

Description

Acoustic lining measuring device

Technical Field

The present disclosure relates to the field of acoustic measurement, and more particularly, to an acoustic liner measurement apparatus.

Background

In the field of acoustic measurement, the acoustic liner testing section is the most important part of the whole experimental equipment, including pipelines, casings and mounting seats. In the prior art, the microphone cannot be conveniently disassembled, assembled and positioned, the influence of atmospheric pressure on the static pressure hole cannot be avoided, and meanwhile, the microphone can be damaged to a certain extent.

Disclosure of Invention

The invention aims to provide an acoustic liner measuring device, which aims to solve the technical problems that in the prior art, the acoustic liner measuring device is complex to disassemble and assemble and is easy to damage a microphone, so that the microphone is conveniently disassembled and assembled while a sound liner testing section is sealed, and the accuracy of measurement is ensured.

In order to achieve the above purpose, the invention provides the following technical scheme:

the embodiment of the invention provides an acoustic liner measuring device, which comprises a pipeline, a microphone, a casing and an acoustic liner arranged between the pipeline and the casing, wherein the end face of a perforated plate of the acoustic liner is flush with the inner wall of a first wall surface of the pipeline, the microphone is arranged on a second wall surface of the pipeline, which is opposite to the first wall surface, and the receiving end of the microphone is flush with the inner wall of the second wall surface;

at least one microphone passes through the mount pad and can dismantle the establishment the second wall, the mount pad includes first frock and establishes the second frock of second wall, first frock the second frock all has the confession the cavity that the microphone passed, first frock is used for the centre gripping the microphone, first frock can dismantle connect in the second frock.

According to at least one embodiment of the present disclosure, sealing rings are disposed at a connection position of the microphone and the first tool, a connection position of the first tool and the second tool, and a connection position of the second tool and the second wall surface.

According to at least one embodiment of the disclosure, the first tool is provided with a clamping part, the clamping part comprises a hoop and a plurality of petal-shaped contraction parts arranged at intervals along the circumferential direction of the first tool, the hoop is sleeved on the contraction parts, and the contraction parts clamp the microphone under the action of the hoop;

a first groove for containing a first sealing ring is formed in the position, close to the contraction portion, of the cavity of the first tool, and the first sealing ring is used for sealing the first tool and the microphone.

According to at least one embodiment of the present disclosure, a first step surface is arranged in a cavity of the second tool, a second step surface is arranged at a connecting position of the second wall surface and the second tool, the first end surface of the first tool, which deviates from the clamping portion, abuts against the first step surface, and the second end surface of the second tool, which deviates from the first tool, abuts against the second step surface.

According to at least one embodiment of the disclosure, the first tool is in threaded connection or clamped connection with the second tool; and the second tool is in threaded connection or clamped connection with the second wall surface.

According to at least one embodiment of the disclosure, when the first tool is in threaded connection with the second tool, the first tool is provided with an external thread section, the number of turns of the external thread section is 1-4, and the thread is a coarse thread.

According to at least one embodiment of the disclosure, the second tool has a connecting section connected with the second wall surface, the length of the connecting section is a, the distance between the second step surface and the outer surface of the second wall surface is b, where a > b;

the second tool is close to the connecting section position is provided with a third step surface, the third step surface is located, the connecting section sleeve between the outer surfaces of the third step surface and the second wall surface is provided with a second sealing ring, and the second sealing ring is used for sealing between the second tool and the second wall surface.

According to at least one embodiment of the present disclosure, the casing is detachably connected to the pipe;

the casing is provided with a cavity for accommodating the sound liner, a bottom plate which is abutted to the end face, away from the perforated plate, of the sound liner is arranged in the cavity, the position of the bottom plate on the casing is adjustable, and the bottom plate is used for sealing the sound liner in the casing.

According to at least one embodiment of the present disclosure, at least one adjusting device for adjusting the bottom plate is arranged in a cavity of the casing, the casing has a first inner wall opposite to the bottom plate, the adjusting device is arranged between the bottom plate and the first inner wall, the adjusting device comprises a threaded sleeve and a stud, and the bottom plate abuts against the end face of the acoustic backing away from the perforated plate through relative movement of the stud and the threaded sleeve.

According to at least one embodiment of this disclosure, the casing with the hookup location department of pipeline is equipped with the otic placode of protrusion in the casing, have on the pipeline with otic placode complex depressed part, be equipped with the third sealing washer on the wall of depressed part, the third sealing washer be used for the casing with seal between the pipeline.

Compared with the prior art, the measuring device has the advantages that the sound liner is arranged between the pipeline and the casing, the end face of the perforated plate of the sound liner is flush with the inner wall of the first wall face of the pipeline, the microphone is arranged on the second wall face of the pipeline, the first wall face and the second wall face are arranged oppositely, and the receiving end of the microphone is flush with the inner wall of the second wall face, so that the acoustic parameters in the pipeline are measured. Because there is great pressure differential inside and outside the pipeline, need prevent with the microphone is fixed by the suction pipe under the effect of pressure differential in, this application sets up two segmentation mount pads, and wherein first frock can apply enough big power and grasp the microphone, prevents that it from moving in the pipeline. And the combination body of the first tool and the microphone is detachably connected to the second tool, and the second tool is arranged on the second wall surface, so that the combination body of the first tool and the microphone can be conveniently assembled and disassembled from the second tool. The bottom of the microphone is larger than the rest of the microphone, and the microphone cannot be taken out if the mounting base is not dismounted for two-stage tool assembly. However, if the mounting seat is frequently removed, the sealing performance is damaged. This application only dismouting first frock and the combination of microphone, second frock need not basically to dismantle again with the second wall assembly back. And the sealing performance between the mounting seat and the pipe body is guaranteed to be damaged due to frequent disassembly and assembly.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 is a schematic view of a three-dimensional structure of an acoustic liner measurement apparatus according to an embodiment of the present disclosure.

Fig. 2 is an exploded schematic view of a mount according to an embodiment of the present disclosure.

Fig. 3 is a schematic view of a first tooling and microphone assembly according to an embodiment of the present disclosure.

Fig. 4 is a schematic cross-sectional view of a first tooling according to an embodiment of the present disclosure.

Fig. 5 is a schematic cross-sectional view of a second tooling according to an embodiment of the present disclosure.

Fig. 6 is a schematic partial cross-sectional view of a second tooling and pipe according to an embodiment of the present disclosure.

Fig. 7 is a schematic cross-sectional view of fig. 1.

Fig. 8 is a perspective view of a barrel according to an embodiment of the present disclosure.

Fig. 9 is a schematic bottom view of a conduit according to an embodiment of the present disclosure.

Fig. 10 is a schematic cross-sectional view of a mount and microphone combination according to an embodiment of the present disclosure.

Reference numerals: 10. a pipeline; 11. a first wall surface; 12. a second wall surface; 121. a second step surface; 13. a recessed portion; 20. a mounting seat; 21. a first tool; 211. a contracting portion; 212. an external threaded section; 213. a first trench; 214. a first end face; 22. a second tool; 221. a second trench; 222. a first step surface; 223. a second end face; 224. a third step surface; 225. a connection section; 23. clamping a hoop; 24. a microphone; 241. a static pressure port; 30. a case; 31. a base plate; 32. an adjustment device; 321. a stud; 322. a threaded sleeve; 33. an ear plate; 34. a third wall surface; 41. a first seal ring; 42. a second seal ring; 44. and a fourth sealing ring.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant matter and not restrictive of the disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In acoustic measurements in high flow rate, high pressure differential environments, where there is a large pressure differential between the interior and exterior, a suction force is applied to the microphone itself towards the interior of the pipe, which requires the microphone mount to apply a sufficient force to the microphone in order to prevent the microphone from being sucked into the pipe. Secondly, the microphone can often carry out the dismouting in the experiment, and dismouting many times can produce irreversible injury to the microphone power cord connection, and simultaneously, the microphone dismouting also must have certain convenience, is convenient for fix.

Referring to fig. 1 to 2, an embodiment of the present invention provides an acoustic liner measurement apparatus, including a pipe 10, a microphone 24, a casing 30, and an acoustic liner disposed between the pipe 10 and the casing 30, wherein the acoustic liner has a perforated plate with an end surface flush with an inner wall of a first wall surface 11 of the pipe 10, the microphone 24 is disposed on a second wall surface 12 of the pipe 10 opposite to the first wall surface 11, and a receiving end of the microphone 24 is flush with an inner wall of the second wall surface 12; at least one microphone 24 passes through mount pad 20 and can dismantle to be established at second wall 12, and mount pad 20 includes first frock 21 and establishes the second frock 22 at second wall 12, and first frock 21, second frock 22 all have the cavity that supplies microphone 24 to pass, and first frock 21 is used for centre gripping microphone 24, and first frock 21 can dismantle and connect in second frock 22.

Specifically, the duct 10 has a first wall 11 and a second wall 12 opposite to each other, and the microphone 24 is detachably mounted on the second wall 12 through the mounting seat 20, it being understood that there may be one microphone 24 or a plurality of microphones 24 may be mounted along the airflow direction of the duct 10. The opening of the casing 30 is communicated with the opening of the second wall surface 12 of the pipeline 10, the sound lining is arranged between the opening of the casing 30 and the opening of the first wall surface 11 of the pipeline 10, the upper surface of the perforated plate of the sound lining is flush with the inner wall of the second wall surface 12, the lower end surface of the microphone 24 is flush with the inner wall of the second wall surface 12, the influence on the airflow of the pipeline 10 is avoided, and the measuring result is accurate.

Illustratively, the mounting seat 20 includes a first fixture 21 and a second fixture 22, wherein the second fixture 22 is detachably disposed on the second wall surface 12, and the first fixture 21 is detachably disposed on the second fixture 22, and the first fixture 21 and the second fixture 22 each have a cavity for passing the microphone 24. Since the lower end of the microphone 24 is larger than the rest of the pipe, only one tool is used to be placed on the pipe, and the tool is also used to hold the microphone 24, and the microphone 24 cannot be removed without disassembling the tool. However, if the tool is removed, the sealing effect between the pipe 10 and the mounting seat 20 is affected by the long-time removal. Therefore, the embodiment of the present invention adopts a mode of the first tool 21 and the second tool 22, wherein the first tool 21 holds the microphone 24, the combination of the first tool 21 and the microphone 24 can be disassembled from the second tool 22, the second tool 22 and the pipeline 10 are basically not disassembled after being assembled, and the sealing performance between the pipeline 10 and the mounting seat 20 is protected from being damaged.

Considering that when acoustic measurement is carried out under the environment with high flow speed and high pressure difference, the pressure inside the pipeline is far lower than the atmospheric pressure, and when the microphone works, the static pressure hole of the microphone needs to be communicated with the inside of the pipeline, so that the requirement of sealing is provided for the mounting seat of the microphone. As shown in fig. 10, sealing rings are provided at the connection position between the microphone 24 and the first tool 21, at the connection position between the first tool 21 and the second tool 22, and at the connection position between the second tool 22 and the second wall surface 12. The static pressure hole 241 of the microphone 24 is located below the connecting position of the microphone 24 and the first tool 21, so that the static pressure hole 241 is communicated with the interior of the pipeline through the cavities of the first tool 21 and the second tool 22, and sealing rings are arranged at the connecting position of the first tool 21 and the second tool 22 and the connecting position of the second tool 22 and the second wall surface 12, so that the static pressure hole 241 is communicated with the interior of the pipeline 10 and is not interfered by atmospheric pressure, and the microphone 24 can normally work.

In order to ensure the clamping force for the microphone 24, prevent the microphone 24 from being sucked into the pipe 10 due to the difference between the internal pressure and the external pressure, and conveniently detach and mount the microphone 24 from the first fixture 21, the embodiment of the present invention adopts a clamping hoop form for clamping. Referring to fig. 2 to 4, the first tooling 21 has a clamping portion, the clamping portion includes a hoop 23 and a plurality of petal-shaped constrictions 211 arranged along the circumference of the first tooling 21 at intervals, the hoop 23 is sleeved on the constrictions 211, and the constrictions 211 clamp the microphone 24 under the action of the hoop 23; a first groove 213 for accommodating the first sealing ring 41 is formed in the cavity of the first tooling 21 near the constricted portion 211, and the first sealing ring 41 is used for sealing the first tooling 21 and the microphone 24.

When the microphone 24 is assembled on the first tool 21, the microphone 24 penetrates through the cavity of the first tool 21 and the first sealing ring 41 arranged in the first groove 213, the clamp 23 is tightened after positioning, the microphone 24 is clamped by the plurality of flap-shaped constrictions 211 arranged on the first tool 21 in the circumferential direction under the action of the clamp 23, and the static pressure hole 241 of the microphone 24 is arranged in the cavity below the first sealing ring 41, so that the static pressure hole 241 is ensured to be communicated with the interior of the pipeline 10 and is not interfered by the atmospheric pressure. When the microphone 24 is detached from the first fixture 21, the microphone can be detached by simply loosening the clamp 23. Therefore, the clamping hoop not only provides enough clamping force, but also has the function of facilitating disassembly and assembly.

Considering that the lower end surface of the microphone 24 is flush with the inner wall surface of the second wall surface 12, and the height of the microphone 24 needs to be adjusted, the heights of the first fixture 21 and the second fixture 22 should have known heights. In order to ensure that the heights of the first fixture 21 and the second fixture 22 are constant, for example, please refer to fig. 5 to 6, a first step surface 222 is provided in a cavity of the second fixture 22, and a second step surface 121 is provided at a connection position of the second wall surface 12 and the second fixture 22, a first end surface 214 of the first fixture 21, which is away from the clamping portion, abuts against the first step surface 222, and a second end surface 223 of the second fixture 22, which is away from the first fixture 21, abuts against the second step surface 121.

Specifically, when the first tool 21 is connected to the second tool 22, the first end surface 214 of the first tool 21 abuts against the first step surface 222, and the first step surface 222 may be a part of the second groove 221, where the second groove 221 is used for placing the fourth sealing ring 44, so that the first tool 21 is connected to the second tool 22 in a sealing manner. And the first step surface 222 is used for the limit of the first tool 21. Similarly, a second step surface 121 is provided at the connecting position of the second wall surface 12 and the second fixture 22, and when the second fixture 22 is connected to the second wall surface 12, the second step surface 121 is provided in the through hole of the second wall surface 12, so that the second end surface 223 of the second fixture 22 abuts against the second step surface 121. When the first fixture 21 and the second fixture 22 are connected, the height of the entire mounting base 20 is fixed, and then the microphone 24 can be fixed before the mounting base is mounted according to the known length of the microphone 24, so that the lower end surface of the microphone is flush with the inner wall of the second wall surface 12 after the microphone is mounted on the pipe 10.

In some embodiments, as shown in fig. 4-6, the first tooling 21 is threadedly engaged with the second tooling 22; the second fixture 22 is screwed to the second wall surface 12. For example, the first fixture 21 has an external thread, the second fixture 22 has a corresponding internal thread, and the first fixture 21 may be connected to the second fixture 22 by a thread. Similarly, the through hole in the second wall 12 has an internal thread, and the other end of the second fixture 22 has an external thread, and the second fixture 22 can be connected to the second wall 12 by a thread. Clamping can be adopted between the first tool 21 and the second tool 22, and between the second tool 22 and the second wall surface 12, for example, the first tool 21 has an elastic buckle, and one end of the second tool 22 has a clamping groove suitable for clamping the buckle in a cavity thereof; similarly, the other end of the second fixture 22 has an elastic clip, and a slot suitable for clipping is formed in the through hole of the second wall 12.

In order to prevent the interface of the microphone 24 from being damaged by excessive rotation when the first tool 21 and the microphone 24 are screwed into the second tool 22 as a whole due to the threaded connection of the microphone head and the electric wire, and to prevent the first tool 21 and the microphone 24 from being frequently disassembled and assembled as a whole during use, the first tool 21 is provided with an external thread section 212, and the number of thread turns of the external thread section 212 is 1-4, and the thread is coarse when the first tool 21 and the second tool 22 are screwed. With the coarse design, the number of turns of the thread is reduced as much as possible while ensuring that the first tooling 21 has enough force applied to the first sealing ring 41, and the present application uses 1-4 turns of the thread, alternatively 1.5 turns, 2.5 turns, etc.

Referring to fig. 5-6, in order to ensure the sealing performance between the second fixture 22 and the second wall 12 and the installation height of the second fixture 22, the second fixture 22 has a connecting section 225 connected to the second wall 12, the length of the connecting section 225 is a, and the distance between the second step surface 121 and the outer surface of the second wall 12 is b, where a > b; the distance a > b ensures that the second end surface 223 of the second tool 22 can abut against the second step surface 121 when the second tool 22 is mounted on the second wall surface 12.

Illustratively, the second fixture 22 has a third step surface 224 at a position close to the connecting section 225, the connecting section 225 between the third step surface 224 and the outer surface of the second wall surface 12 is sleeved with a second sealing ring 42, and the second sealing ring 42 is used for sealing between the second fixture 22 and the second wall surface 12. Specifically, the second seal ring 42 is sleeved on the connecting section 225, and when the second tool 22 is connected to the second wall surface 12, the second seal ring 42 is pressed against the outer surface of the second wall surface 12 by the third step surface 224, so that the seal between the second seal ring and the second wall surface is realized, and the accuracy of the acoustic lining measurement result is ensured.

Considering the installation problem of the acoustic liner and the high flow speed environment, the pressure difference between the inside and the outside of the casing is extremely large, and once air leakage occurs, the measurement result is deviated. Illustratively, the casing 30 is formed integrally, so as to ensure the sealing performance of the casing; the casing 30 is detachably connected with the pipeline 10; for example by means of bolts. The casing 30 has a cavity for accommodating the acoustic liner, a bottom plate 31 is arranged in the cavity and is abutted against the end face of the acoustic backing away from the perforated plate, the position of the bottom plate 31 in the casing 30 is adjustable, and the bottom plate 31 is used for sealing the acoustic liner in the casing 30. The use of a position-adjustable base plate 31 against the end face of the acoustic backing facing away from the perforated plate allows the acoustic liner to be free of excess gaps in the casing or to be leaktight in the casing, so that no pressure differences between the duct and the interior of the casing occur. The acoustic liner is used as a noise reduction element applied to multiple scenes, the type and the height of the acoustic liner are not fixed, and the depth of the processed casing is fixed, so that the bottom plate 31 with the adjustable position can be suitable for acoustic liners with different heights, and the sealing performance of the acoustic liner in the casing is ensured.

Specifically, one or more adjusting devices 32 for adjusting the bottom plate 31 are disposed in the cavity of the casing 30, as shown in fig. 7, the adjusting devices 32 are disposed between the bottom plate 31 and a third wall 34, the third wall 34 is the bottom surface of the casing 30 opposite to the bottom plate 31, the adjusting devices 32 include a threaded sleeve 322 and a threaded stud 321, and the bottom plate 31 abuts against the end surface of the acoustic backing away from the perforated plate through the relative movement of the threaded stud 321 and the threaded sleeve 322. The studs 321 are rotatably disposed on the third wall 34, the nuts 322 are disposed on the bottom plate 31, and the studs 321 are adjusted to adjust the position of the bottom plate 31 in the receiver, so that the bottom plate 31 abuts against the bottom surface of the acoustic liner to be tested. It is understood that the stud 321 may be disposed on the bottom plate 31 and the nut 322 disposed on the third wall 34, and the height of the bottom plate 31 may be adjusted.

In order to ensure the sealing between the casing 30 and the pipe 10 and the outer surface of the perforated plate of the acoustic liner being flush with the inner wall surface of the first wall surface 11, please refer to fig. 8-9, in the embodiment of the present invention, an ear plate 33 protruding from the casing 30 is disposed at the connection position between the casing 30 and the pipe 10, a recess 13 matching with the ear plate 33 is disposed on the pipe 10, and a third sealing ring is disposed on the wall surface of the recess 13 and is used for sealing between the casing 30 and the pipe 10. The perforated plate of the acoustic liner is slightly larger than the rest of the acoustic liner and can just overlap the upper surfaces of the two ear plates 33 protruding from the housing 30, and the acoustic liner is pressed against the ear plates 33 by the cooperation with the recesses 13 of the duct 10, so that the upper surface of the acoustic liner and the lower surface of the duct are in the same plane. It will be appreciated that although two lugs 33 are shown, in some embodiments, there may be four lugs 33 around the open mouth of the case. Further, a groove is formed on the wall surface of the recess 13 of the pipe 10 for placing a third sealing ring, thereby ensuring sealing between the casing 30 and the pipe 10 after the acoustic liner is placed.

During specific acoustic measurement, the first sealing ring 41 is installed in the first groove 213 of the first tool 21, the microphone 24 penetrates through the first tool 21, the clamp 23 is sleeved on the contraction part 211, and pre-tightening is performed to form a first assembly;

mounting the second seal ring 42 on the second groove 221 of the second tool 22, and mounting the first component on the second tool 22;

sleeving the fourth sealing ring 44 on the connecting section 225 of the second tool 22, installing the fourth sealing ring in the through hole of the second wall surface 12, adjusting the relative height between the microphone 24 and the first tool 21, tightening the clamp 23, and clamping the microphone 24, so that the lower end surface of the microphone 24 is flush with the inner wall surface of the second wall surface 12, because the heights of the first tool 21 and the second tool 22 are fixed;

then, according to the height of the acoustic liner, the height of the bottom plate 31 in the casing is adjusted through the adjusting device 32, so that the bottom plate is abutted to the bottom surface of the acoustic liner;

after the test is finished, the microphone 24 needs to be dismounted or replaced, only the first tool 21 and the microphone 24 clamped by the first tool are dismounted, and then the clamp is loosened, so that the second tool 22 does not need to be dismounted frequently.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples and features of the various embodiments/modes or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are provided merely for clarity of explanation and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. An acoustic liner measuring device is characterized by comprising a pipeline, a microphone, a casing and an acoustic liner arranged between the pipeline and the casing, wherein the end face of a perforated plate of the acoustic liner is flush with the inner wall of a first wall face of the pipeline, the microphone is arranged on a second wall face of the pipeline, which is opposite to the first wall face, and the receiving end of the microphone is flush with the inner wall of the second wall face;

2. The measuring device according to claim 1, wherein sealing rings are arranged at the connecting position of the microphone and the first tool, the connecting position of the first tool and the second tool, and the connecting position of the second tool and the second wall surface.

3. The measuring device according to claim 1, wherein the first tool is provided with a clamping portion, the clamping portion comprises a hoop and a plurality of petal-shaped constrictions arranged at intervals along the circumferential direction of the first tool, the hoop is sleeved on the constrictions, and the constrictions clamp the microphone under the action of the hoop;

4. The measuring device according to claim 1, wherein a cavity of the second tool is provided with a first step surface, a connecting position of the second wall surface and the second tool is provided with a second step surface, a first end surface of the first tool, which is far away from the clamping portion, abuts against the first step surface, and a second end surface of the second tool, which is far away from the first tool, abuts against the second step surface.

5. The measuring device according to any one of claims 1 to 4, wherein the first tool is in threaded connection or clamped connection with the second tool; and the second tool is in threaded connection or clamped connection with the second wall surface.

6. The measuring device according to claim 5, wherein when the first tool is screwed with the second tool, the first tool is provided with an external thread section, the number of thread turns of the external thread section is 1-4, and the thread is a coarse thread.

7. The measuring device according to claim 5, wherein the second tool has a connecting section connected with the second wall surface, the length of the connecting section is a, the distance between the second step surface and the outer surface of the second wall surface is b, and a is greater than b;

the second frock is close to linkage segment position department has the third step face, is located the third step face with linkage segment cover between the surface of second wall is equipped with the second sealing washer, the second sealing washer is used for the second frock with seal between the second wall.

8. The measurement device of claim 5, wherein the casing is removably connected to the conduit;

9. A measuring device according to claim 8, characterized in that at least one adjusting device for adjusting the bottom plate is arranged in the cavity of the casing, the casing has a third wall surface opposite to the bottom plate, the adjusting device is arranged between the bottom plate and the third wall surface, the adjusting device comprises a threaded sleeve and a threaded stud, and the bottom plate is abutted against the end surface of the acoustic backing away from the perforated plate through the relative movement of the threaded stud and the threaded sleeve.

10. The measuring device as claimed in claim 8, wherein a connecting position of the casing and the pipe is provided with an ear plate protruding from the casing, the pipe is provided with a recess portion matching with the ear plate, a wall surface of the recess portion is provided with a third sealing ring, and the third sealing ring is used for sealing between the casing and the pipe.