Impedance tube for sound absorption and insulation test of plate

Abstract

The utility model discloses a board sound absorption and insulation test impedance tube which comprises an inner sleeve, an outer sleeve and a locking ring, and one end of the inner sleeve is a sleeving end; the inner circumferential surface of one end of the outer sleeve is hermetically sleeved with the outer circumferential surface of the sleeving end, an annular abutting step is arranged on the inner circumferential surface of the outer sleeve, the abutting step and the end surface of the sleeving end are oppositely arranged at an interval, and a clamping gap for clamping a plate is formed between the abutting step and the end surface of the sleeving end; the locking ring is connected to the peripheral side between the outer sleeve and the inner sleeve in a sleeved mode, and the two ends of the locking ring are connected with the outer sleeve and the inner sleeve respectively. The sample plate is clamped in the clamping gap formed between the abutting step and the end face of the sleeving end, and the sample plate is embedded and fixed, so that the sealing performance of the impedance tube is not affected even if the edge of the sample plate is cut unsmoothly; the end face of the sleeving end and the abutting step are attached to the two side faces of the sample plate respectively, it is guaranteed that the sample plate has a correct installation angle, and the testing accuracy is improved.

Description

Technical Field

[0001] This utility model relates to the field of acoustic performance testing, and in particular to a test impedance tube for sound absorption and insulation of sheet metal. Background Technology

[0002] Composite panels are lightweight, high-strength, and have excellent sound insulation properties, making them widely used in various fields such as construction, transportation, and machinery. Currently, impedance tubes are commonly used to evaluate the acoustic characteristics of composite panels. During acoustic testing, a sample of a predetermined shape and size is cut from the composite panel and tested through an impedance tube. However, because composite panels are relatively hard and have rough edges, the sample can easily become misaligned or poorly sealed when installed in the impedance tube, affecting the accuracy of the sound absorption and insulation performance test. Utility Model Content

[0003] The purpose of this utility model is to provide a test impedance tube for sound absorption and insulation of sheet metal, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0005] This utility model provides a test impedance tube for sound absorption and insulation of sheet metal, comprising:

[0006] Inner sleeve, one end of which is a sleeve end;

[0007] The outer sleeve has an inner circumferential surface at one end that is sealed to the outer circumferential surface of the sleeve end. The inner circumferential surface of the outer sleeve is provided with an annular abutment step. The abutment step and the end face of the sleeve end are arranged at intervals facing each other. A clamping gap for clamping the plate is formed between the abutment step and the end face of the sleeve end.

[0008] A locking ring is fitted onto the outer periphery between the outer sleeve and the inner sleeve, with its two ends connected to the outer sleeve and the inner sleeve, respectively.

[0009] The beneficial effects of the sound absorption and insulation test impedance tube for sheet metal of this utility model are:

[0010] In use, the sample plate is placed at the end of the outer sleeve to be fitted with the inner sleeve, with one side of the sample plate in contact with the abutment step. Then, the sleeve end on the inner sleeve is fitted onto the outer sleeve until the end face of the sleeve end is in contact with the other side of the sample plate. At the same time, the locking ring fixes and seals the inner and outer sleeves. At this time, the sample plate is clamped in the clamping gap formed between the abutment step and the end face of the sleeve end, achieving the effect of fitting and fixing the sample plate. In this way, even if the edge of the sample plate is not cut smoothly, it will not affect the sealing performance of the impedance tube. Furthermore, the end face of the sleeve end and the abutment step respectively fit against the two sides of the sample plate, ensuring that the sample plate has the correct installation angle and improving the accuracy of the test.

[0011] As a further improvement to the above technical solution, at least one sealing ring is provided between the inner circumferential surface of the outer sleeve and the outer circumferential surface of the sleeve end.

[0012] As a further improvement to the above technical solution, the outer peripheral surface of the socket end is provided with an installation groove, and the sealing ring is installed in the installation groove.

[0013] As a further improvement to the above technical solution, the locking ring is divided into a fixed end and a connecting end at both ends. The fixed end is fixedly installed on the outer circumferential surface of the outer sleeve or the inner sleeve, and the connecting end is detachably sleeved on the outer circumferential surface of the inner sleeve or the outer sleeve.

[0014] As a further improvement to the above technical solution, the fixed end is rotatably disposed relative to the outer sleeve or the inner sleeve, and the connecting end is threadedly sleeved onto the inner sleeve or the outer sleeve.

[0015] As a further improvement to the above technical solution, the outer circumferential surface of the outer sleeve or the inner sleeve is provided with a first positioning step and a second positioning step that are spaced apart along the axial direction. The first positioning step and the second positioning step are arranged in opposite directions. The inner circumferential wall of the fixed end is provided with a third positioning step. The end face of the fixed end is provided with a limiting ring. The third positioning step abuts against the first positioning step, and the limiting ring abuts against the second positioning step.

[0016] As a further improvement to the above technical solution, a rotating bearing is fitted on the inner circumferential surface of the fixed end, and the fixed end is rotatably connected to the outer circumferential surface of the outer sleeve or the inner sleeve through the rotating bearing.

[0017] As a further improvement to the above technical solution, the outer periphery of the locking ring is provided with friction texture.

[0018] As a further improvement to the above technical solution, at least one first microphone is installed on the outer peripheral wall of the inner sleeve, and at least one second microphone is installed on the outer peripheral wall of the outer sleeve.

[0019] As a further improvement to the above technical solution, the sound absorption and insulation test impedance tube of the plate also includes a sound source tube and a sound absorption tube. The end of the inner sleeve away from the outer sleeve is connected to the sound source tube or the sound absorption tube, and the end of the outer sleeve away from the inner sleeve is connected to the sound absorption tube or the sound source tube.

[0020] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0022] Figure 1 This is an exploded view of an embodiment of the sound absorption and insulation test impedance tube for sheet metal provided by this utility model;

[0023] Figure 2 This is a front cross-sectional view of an embodiment of the sound absorption and insulation test impedance tube for sheet metal provided by this utility model.

[0024] Figure 3 This is a schematic diagram of one embodiment of the sound absorption and insulation test impedance tube for sheet metal provided by this utility model;

[0025] Figure 4 This is a schematic diagram of the test use of an embodiment of the sound absorption and insulation test impedance tube for sheet metal provided by this utility model;

[0026] Icon labels:

[0027] Inner sleeve 100; Socket end 110; Mounting groove 120; First microphone 130;

[0028] Outer tube 200; Abutment step 210; First positioning step 220; Second positioning step 230; Second microphone 240;

[0029] Locking ring 300; fixed end 310; third positioning step 311; limit ring 312; rotating bearing 313; connecting end 320; friction texture 330;

[0030] Clamping gap 400;

[0031] 500 sealing ring;

[0032] 600mm sound source tube;

[0033] 700mm sound-absorbing tube;

[0034] Transition tube 800;

[0035] 900 buckle; 910 support base. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0039] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0040] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this utility model, not all embodiments.

[0041] Currently, impedance tubes are commonly used to evaluate the acoustic properties of composite panels. When conducting acoustic tests on composite panels, a sample sheet of a predetermined shape and size is cut from the composite panel and tested through an impedance tube. However, because composite panels are relatively hard and the edges are not smooth, when installing the sample sheet in the impedance tube, it is easy for the material sample to be installed tilted and for the sealing to be poor, which affects the accuracy of the sound absorption and insulation performance test of the composite panel. Therefore, this utility model proposes an impedance tube for testing the sound absorption and insulation performance of panels to solve the above problems.

[0042] like Figures 1 to 3 As shown, the sound absorption and insulation test impedance tube of this utility model includes: an inner sleeve 100, an outer sleeve 200, and a locking ring 300.

[0043] In this embodiment, both the inner sleeve 100 and the outer sleeve 200 are straight pipe structures. In other embodiments, other pipe structures can be set according to the testing requirements. In order to improve the testing accuracy and make the sound waves transmit more evenly inside the pipe, both the inner sleeve 100 and the outer sleeve 200 in this embodiment are round pipes.

[0044] Considering that traditional impedance tubes have thinner walls and insufficient sound insulation compared to composite panels, resulting in significant deviations during testing, the inner sleeve 100 and outer sleeve 200 in this embodiment feature ultra-thick walls with an average sound insulation exceeding 40dB, enabling more accurate testing of the sound absorption and insulation performance of composite panels.

[0045] like Figure 1 and Figure 2 As shown, in this embodiment, one end of the inner sleeve 100 is a sleeve end 110, which is used to connect with the outer sleeve 200. The inner circumferential surface of one end of the outer sleeve 200 is sealed to the outer circumferential surface of the sleeve end 110. The inner circumferential surface of the outer sleeve 200 is provided with an annular abutment step 210. The abutment step 210 is set towards the side of the inner sleeve 100, so that when the outer sleeve 200 and the inner sleeve 100 are connected together, the abutment step 210 and the end face of the sleeve end 110 are set in opposite directions at a distance. At this time, a clamping gap 400 for clamping the sample plate is formed between the abutment step 210 and the end face of the sleeve end 110.

[0046] The locking ring 300 of this utility model is a sleeve structure. The locking ring 300 is sleeved on the outer periphery between the outer sleeve 200 and the inner sleeve 100. The two ends of the locking ring 300 are respectively connected to the outer sleeve 200 and the inner sleeve 100. The locking ring 300 is used to reinforce and seal the connection between the outer sleeve 200 and the inner sleeve 100.

[0047] In use, a sample plate of a predetermined shape and size is pre-cut from the composite board. In this embodiment, the sample plate is disc-shaped. The sample plate is placed on the end of the outer sleeve 200 that is to be fitted with the inner sleeve 100, and one side of the sample plate is made to fit against the abutment step 210. Then, the fitting end 110 on the inner sleeve 100 is fitted into the outer sleeve 200 until the end face of the fitting end 110 fits against the other side of the sample plate. At the same time, the locking ring 300 is fitted between the inner sleeve 100 and the outer sleeve 200 for fixing and sealing.

[0048] In this way, the sample plate is clamped in the clamping gap 400 formed between the abutment step 210 and the end face of the sleeve end 110, achieving the effect of fitting and fixing the sample plate. Even if the edge of the sample plate is not cut smoothly, it will not affect the sealing performance of the impedance tube. Furthermore, the end face of the sleeve end 110 and the abutment step 210 respectively fit against the two sides of the sample plate, ensuring that the sample plate has the correct installation angle and improving the accuracy of the test.

[0049] To further improve sealing, such as Figure 1 and Figure 2 As shown, in this embodiment, a sealing ring 500 is provided between the inner circumferential surface of the outer sleeve 200 and the outer circumferential surface of the sleeve end 110. The number of sealing rings 500 depends on the requirements, and multiple sealing rings 500 can be provided. In this embodiment, one sealing ring 500 is provided.

[0050] Regarding the fixing of the sealing ring 500, considering that when installing the sample plate, the sample plate is first placed inside the outer sleeve 200, and then the inner sleeve 100 is fitted into the outer sleeve 200, in order to avoid the sample plate touching the sealing ring 500, in this embodiment the sealing ring 500 is fixedly installed on the inner sleeve 100, that is, fixedly fitted on the outer circumferential surface of the sleeve end 110.

[0051] like Figure 1 As shown, the outer peripheral surface of the sleeve end 110 in this embodiment is provided with an installation groove 120, and the sealing ring 500 is installed in the installation groove 120 to position and install the sealing ring 500. The sealing ring 500 in this embodiment is made of rubber material.

[0052] Furthermore, to prevent the locking ring 300 from being lost during use and to improve assembly efficiency, the locking ring 300 of this utility model has two ends: a fixed end 310 and a connecting end 320. The fixed end 310 is fixedly installed on the outer circumferential surface of the outer sleeve 200 or the inner sleeve 100, while the connecting end 320 is detachably sleeved on the outer circumferential surface of the inner sleeve 100 or the outer sleeve 200. It can be understood that the locking ring 300 is pre-fixed on the outer sleeve 200 or the inner sleeve 100. Then, when the outer sleeve 200 and the inner sleeve 100 are sleeved together, the locking ring 300 can be connected between the abutment step 210 and the end face of the sleeve end 110, thereby improving the firmness and sealing of the connection between the outer sleeve 200 and the inner sleeve 100.

[0053] In this embodiment, the locking ring 300 is fixedly installed on the outer sleeve 200, and the locking ring 300 is detachably connected to the inner sleeve 100. In some other embodiments, the locking ring 300 can be fixedly installed on the inner sleeve 100, while the locking ring 300 is detachably connected to the outer sleeve 200.

[0054] Furthermore, in this embodiment, the fixed end 310 is rotatably disposed relative to the outer sleeve 200, while the connecting end 320 is threadedly sleeved on the outer periphery of the inner sleeve 100. The inner peripheral wall of the connecting end 320 in this embodiment is provided with an internal thread, while the outer peripheral surface of the inner sleeve 100 is provided with an external thread. Thus, when the inner sleeve 100 and the outer sleeve 200 are sleeved together, the inner sleeve 100 and the outer sleeve 200 can be moved closer to each other by rotating the locking ring 300, so as to firmly clamp the sample plate between the inner sleeve 100 and the outer sleeve 200.

[0055] In some other embodiments, the locking ring 300 can be fitted into the inner sleeve 100 by insertion.

[0056] Regarding the rotational fixing method of the locking ring 300, such as Figure 2 As shown, in this embodiment, the outer circumferential surface of the outer sleeve 200 is provided with a first positioning step 220 and a second positioning step 230 spaced apart along the axial direction. This embodiment limits the axial extension of the impedance tube in the left-right direction, and thus both the outer sleeve 200 and the inner sleeve 100 extend in the left-right direction, and the outer sleeve 200 and the inner sleeve 100 are sleeved together in the left and right directions. The second positioning step 230 and the first positioning step 220 are spaced apart and arranged opposite to each other in the left and right directions. A third positioning step 311 is provided on the inner circumferential wall of the fixed end 310. The third positioning step 311 faces to the left. A limiting ring 312 is provided on the end face of the fixed end 310. The limiting ring 312 is a circular plate structure. The inner diameter of the limiting ring 312 is smaller than the inner diameter of the fixed end 310. The limiting ring 312 is fixed to the end face of the fixed end 310 by screws.

[0057] The third positioning step 311 slides against the first positioning step 220, and the limiting ring 312 slides against the second positioning step 230, thereby achieving axial positioning of the locking ring 300 on the outer sleeve 200.

[0058] To improve the smoothness of the rotation of the locking ring 300, in this embodiment, a rotating bearing 313 is fitted on the inner circumferential surface of the fixed end 310. The fixed end 310 is rotatably connected to the outer circumferential surface of the outer sleeve 200 through the rotating bearing 313. The rotating bearing 313 is a needle roller bearing.

[0059] In this embodiment, the second positioning step 230 is set as the end face of the rotating bearing 313, while the first positioning step 220 is the end face of the outer sleeve 200. As a result, the inner diameter of the limiting ring 312 is smaller than the outer diameter of the rotating bearing 313, and the rotating bearing 313 is fixed on the outer circumferential surface of the outer sleeve 200.

[0060] For ease of operation, the outer circumference of the locking ring 300 is provided with friction grooves 330, and the user can manually rotate the locking ring 300.

[0061] The outer peripheral wall of the inner sleeve 100 of this utility model is equipped with at least one first microphone 130, and the outer peripheral wall of the outer sleeve 200 is equipped with at least one second microphone 240. The first microphone 130 and the second microphone 240 are respectively arranged on the left and right sides of the sample plate to detect the sound waves on the left and right sides of the sample plate.

[0062] like Figure 4 As shown, the sound absorption and insulation test impedance tube of the board in this embodiment also includes a sound source tube 600 and a sound absorption tube 700. The end of the inner sleeve 100 away from the outer sleeve 200 is connected to the sound source tube 600 or the sound absorption tube 700, while the end of the outer sleeve 200 away from the inner sleeve 100 is connected to the sound absorption tube 700 or the sound source tube 600. The sound source tube 600 has a built-in sound source device to provide the sound source for the test, while the sound absorption tube 700 has a built-in sound absorber to absorb the sound waves after the test.

[0063] In this embodiment, the sound source tube 600 is connected to the inner sleeve 100, and the sound absorption tube 700 is connected to the outer sleeve 200. Furthermore, in this embodiment, a transition tube 800 is provided between the sound absorption tube 700 and the outer sleeve 200. Both the sound source tube 600 and the transition tube 800 are equipped with microphones.

[0064] To improve the stability of the connection between the tubes, the outer sleeve 200, the transition tube 800 and the sound-absorbing tube 700 are connected by a snap fastener 900, and the inner sleeve 100 and the sound source tube 600 are connected by a snap fastener 900. The snap fastener 900 is also provided with a support seat 910 for supporting the impedance tube.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A panel absorption and insulation test impedance tube, characterized by, The plate sound absorption and insulation test impedance tube comprises an inner sleeve (100), one end of the inner sleeve (100) being a sleeving end (110); an outer sleeve (200), an inner peripheral surface of one end of the outer sleeve (200) being sealingly sleeved with an outer peripheral surface of the sleeving end (110), the inner peripheral surface of the outer sleeve (200) being provided with an annular abutting step (210), the abutting step (210) being oppositely spaced apart from an end surface of the sleeving end (110), a clamping gap (400) for clamping a plate being formed between the abutting step (210) and the end surface of the sleeving end (110); and a locking ring (300), the locking ring (300) being sleeved on an outer peripheral side between the outer sleeve (200) and the inner sleeve (100), two ends of the locking ring (300) being connected with the outer sleeve (200) and the inner sleeve (100) respectively.

2. The plate sound absorption and insulation test impedance tube according to claim 1, wherein at least one sealing ring (500) is arranged between the inner peripheral surface of the outer sleeve (200) and the outer peripheral surface of the sleeving end (110).

3. The plate sound absorption and insulation test impedance tube according to claim 2, wherein the outer peripheral surface of the sleeving end (110) is provided with a mounting groove (120), and the sealing ring (500) is mounted in the mounting groove (120).

4. The plate sound absorption and insulation test impedance tube according to claim 1, wherein two ends of the locking ring (300) are divided into a fixed end (310) and a connecting end (320), the fixed end (310) being fixedly mounted on an outer peripheral surface of the outer sleeve (200) or the inner sleeve (100), and the connecting end (320) being detachably sleeved on an outer peripheral surface of the inner sleeve (100) or the outer sleeve (200).

5. The plate sound absorption and insulation test impedance tube according to claim 4, wherein the fixed end (310) is rotatably arranged relative to the outer sleeve (200) or the inner sleeve (100), and the connecting end (320) is threadedly sleeved on the inner sleeve (100) or the outer sleeve (200).

6. The plate sound absorption and insulation test impedance tube according to claim 5, wherein the outer peripheral surface of the outer sleeve (200) or the inner sleeve (100) is provided with a first positioning step (220) and a second positioning step (230) which are spaced apart along an axial direction, the first positioning step (220) and the second positioning step (230) being oppositely arranged, an inner peripheral wall of the fixed end (310) is provided with a third positioning step (311), an end surface of the fixed end (310) is provided with a limiting ring (312), the third positioning step (311) abuts against the first positioning step (220), and the limiting ring (312) abuts against the second positioning step (230).

7. The plate sound absorption and insulation test impedance tube according to claim 6, wherein ​ ​ ​ ​ ​ ​ ​ ​ The inner circumferential surface of the fixed end (310) is sleeved with a rotating bearing (313), and the fixed end (310) is rotatably connected with the outer circumferential surface of the outer sleeve (200) or the inner sleeve (100) through the rotating bearing (313).

8. The panel absorption and insulation test impedance tube according to claim 5, wherein: The outer circumferential surface of the locking ring (300) is provided with friction lines (330).

9. The panel absorption and insulation test impedance tube according to claim 1, wherein: The outer circumferential wall of the inner sleeve (100) is provided with at least one first microphone (130), and the outer circumferential wall of the outer sleeve (200) is provided with at least one second microphone (240).

10. The panel absorption and insulation test impedance tube according to claim 1, wherein: The panel absorption and insulation test impedance tube further comprises a sound source tube (600) and an absorption tube (700), one end of the inner sleeve (100) away from the outer sleeve (200) is connected to the sound source tube (600) or the absorption tube (700), and one end of the outer sleeve (200) away from the inner sleeve (100) is connected to the absorption tube (700) or the sound source tube (600).

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