High-temperature high-flow-rate acoustic impedance flow tube

Abstract

The utility model relates to the technical field of acoustic materials, in particular to a high-temperature high-flow-rate acoustic impedance flow tube which comprises a high-speed fan, an air outlet of the high-speed fan is communicated with a heater through a fan connecting section, one end of the heater is connected with a damping section, one end of the damping section is communicated with an airflow processing section, and one end of the airflow processing section is connected with a sound source section. The sound source section is far away from the airflow treatment section and is communicated with a test box, a placement opening is formed in the top of the test box, a cover plate is arranged at the placement opening in a closed mode, acoustic probes communicated with the interior of the test box are evenly arranged on the cover plate, the heater is used for heating airflow so as to simulate a high-temperature complex environment, and the damping joint is used for eliminating vibration generated by the high-speed fan. The airflow treatment section performs corresponding treatment of homogenization and stabilization on airflow, the sound source section emits required sound waves, the sound waves flow along with the airflow and flow above the test piece, the test piece generates absorbing or reflecting sound waves, and the acoustic probe detects the change of the sound waves in the test box to obtain the acoustic performance of the test piece.

Description

Technical Field

[0001] This utility model relates to the field of acoustic materials technology, specifically to a high-temperature, high-flow-rate acoustic impedance flow tube. Background Technology

[0002] With the increasing demands for sound environment quality in modern society and the urgent need for noise control in industries such as industry, transportation, and construction, the research and optimization of material acoustic properties has become a key issue. In the field of architectural acoustics, the precise control of sound quality in venues such as concert halls and theaters, and the standardized requirements for sound insulation in residential and office spaces, all rely on the accurate assessment of the sound absorption and sound insulation performance of materials. In industrial production, noise reduction of mechanical equipment, sound and heat insulation of engine compartments in the aerospace field, and the quiet design of automobiles and home appliances all require performance optimization by measuring parameters such as acoustic impedance and sound attenuation of materials. However, traditional testing devices for the acoustic properties of materials have certain limitations, such as stringent testing environment requirements, difficulty in accurately measuring some parameters, and a lack of dynamic monitoring of the acoustic characteristics of materials under complex environments (such as high temperature and strong airflow). Utility Model Content

[0003] The purpose of this invention is to provide a high-temperature, high-flow-rate acoustic impedance flow tube to solve the limitations of traditional material acoustic performance testing devices, such as stringent testing environment requirements, difficulty in accurately measuring some parameters, and lack of dynamic monitoring of material acoustic properties under complex environments (such as high temperature and strong airflow).

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A high-temperature, high-flow-rate acoustic impedance flow tube includes a high-speed fan. The outlet of the high-speed fan is connected to a heater via a fan connection section. The diameter of the fan connection section gradually increases from one end near the high-speed fan to the other end. A vibration damping section is connected to the end of the heater away from the fan connection section. An airflow treatment section is connected to the end of the airflow treatment section away from the vibration damping section. A sound source section is connected to the end of the sound source section away from the airflow treatment section. A test chamber is connected to the top of the test chamber, and a cover plate is closed at the top of the test chamber. Acoustic probes connected to the interior of the test chamber are evenly arranged on the cover plate. Test specimens are placed on the bottom side of the test chamber, directly opposite the acoustic probes.

[0006] A further technical solution is that the airflow treatment section includes a connecting pipe and a front silencer box. The two ends of the connecting pipe are respectively connected to the damping section and the sound source section. The front silencer box is sleeved on the outer side of the connecting pipe near the damping section. The inner side wall of the front silencer box is covered with front filling material. A front silencer perforated plate is provided between the outer side of the connecting pipe and the front filling material so that a front air layer is formed between the front silencer perforated plate and the front filling material. The inner side of the connecting pipe outside the front silencer box is provided with a honeycomb device and a damping mesh in sequence.

[0007] A further technical solution is that the damping joint includes a bellows and a protective frame. The two ends of the bellows are respectively connected to the heater and the connecting pipe. The protective frame is sleeved on the outside of the bellows and is connected to the outer wall of the heater and the outer wall of the front silencer box at both ends.

[0008] A further technical solution is that the sound source section includes a sound source pipe, with both ends of the sound source pipe connected to a connecting pipe and a test chamber, respectively. Conduits are connected to both the left and right side walls of the sound source pipe, and a horn is connected to the end of the conduit furthest from the sound source section.

[0009] A further technical solution is that a diffuser tube is connected to the end of the test chamber away from the sound source section, and the diameter of the diffuser tube gradually increases from the end closest to the sound source section to the other end.

[0010] A further technical solution is to install a rear silencer box on the outside of the diffuser tube, and lay a rear filling material on the inner wall of the rear silencer box. A rear silencer perforated plate is provided between the outside of the diffuser tube and the rear filling material so that a rear air layer is formed between the rear silencer perforated plate and the rear filling material.

[0011] A further technical solution is that an installation frame connected to the interior is provided on the outer wall of the bottom side of the test chamber. A sealing plate is sealed at the bottom end of the installation frame. A movable plate is slidably provided inside the installation frame. A vertically arranged threaded rod is threadedly connected to the sealing plate. The top end of the threaded rod rotates and passes into the installation frame and is rotatably connected to the bottom side of the movable plate. The bottom end of the threaded rod rotates through the sealing plate and is connected to a rotating disk. Vertically arranged limiting rods are provided on both sides of the threaded rod on the bottom side of the movable plate. The bottom end of the limiting rod slides through the sealing plate. The test specimen is laid on the top side of the movable plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] In this invention, the test specimen is placed inside the test chamber by opening the cover plate. The cover plate is then fixed to the top of the test chamber using a snap-fit ​​structure to close the placement opening. Simultaneously, the acoustic probe faces the test specimen. A high-speed fan provides high-pressure, high-velocity airflow. The diameter of the fan connection section gradually increases, which serves to conduct and stabilize the airflow. A heater heats the airflow, simulating a complex high-temperature environment. A vibration damping section eliminates the vibration generated by the high-speed fan. An airflow treatment section homogenizes and stabilizes the airflow. A sound source section emits the required sound waves, which flow with the airflow and pass over the test specimen. The test specimen absorbs or reflects the sound waves. The acoustic probe detects the changes in the sound waves inside the test chamber, thereby determining the acoustic performance of the test specimen. Attached Figure Description

[0014] Figure 1This is a schematic diagram of a high-temperature, high-flow-rate acoustic impedance flow tube structure according to the present invention.

[0015] Figure 2 This is a schematic diagram of the internal structure of the test chamber and connecting pipe of this utility model.

[0016] Figure 3 This is a schematic diagram of the sound source section and test chamber structure of this utility model.

[0017] Figure 4 This is a schematic diagram of the internal structure of the test chamber of this utility model.

[0018] Figure 5 This is a schematic diagram of the internal structure of the rear silencer box of this utility model.

[0019] Icons: 1-High-speed fan, 2-Fan connection section, 3-Heater, 4-Vibration damping joint, 5-Sound source section, 6-Test chamber, 7-Placement port, 8-Cover plate, 9-Acoustic probe, 10-Mounting frame, 11-Sealing plate, 12-Test piece, 13-Connecting pipe, 14-Front silencer box, 15-Front silencer perforated plate, 16-Honeycomb unit, 17-Damping mesh, 18-Bellboard, 19-Protective frame, 20-Sound source pipe, 21-Conduit, 22-Horn, 23-Diffuser, 24-Rear silencer box, 25-Rear silencer perforated plate, 26-Moving plate, 27-Threaded rod, 28-Rotating disc, 29-Limiting rod, 30-Snap fastener. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] Example 1

[0022] Reference Figures 1 to 5 As shown, this utility model discloses a high-temperature, high-flow-rate acoustic impedance flow pipe, including a high-speed fan 1. The outlet of the high-speed fan 1 is connected to a heater 3 through a fan connecting section 2. The diameter of the fan connecting section 2 gradually increases from one end near the high-speed fan 1 to the other end. The end of the heater 3 away from the fan connecting section 2 is connected to a damping section 4. The end of the damping section 4 away from the heater 3 is connected to an airflow treatment section. The end of the airflow treatment section away from the damping section 4 is connected to a sound source section 5. The sound source section 5 away from the airflow treatment section is connected to a test chamber 6. The top of the test chamber 6 has a placement opening 7. A cover plate 8 is closed at the placement opening 7. The cover plate 8 and the top side of the test chamber 6 are connected by a buckle 30. Acoustic probes 9, which are connected to the inside of the test chamber 6, are evenly arranged on the cover plate 8. A test piece 12 is provided on the bottom side of the test chamber 6, directly opposite the acoustic probes 9.

[0023] Specifically, in use, the test piece 12 is placed inside the test chamber 6 by opening the cover plate 8. The cover plate 8 is then fixed to the top side of the test chamber 6 by the buckle 30 structure to close the placement opening 7. At the same time, the acoustic probe 9 is facing the test piece 12. The high-speed fan 1 is used to provide high-pressure, high-velocity airflow. The diameter of the fan connection section 2 is gradually increased, which not only conducts airflow but also stabilizes it. The heater 3 is used to heat the airflow, thereby simulating a complex high-temperature environment. The vibration damping section 4 is used to eliminate the vibration generated by the high-speed fan 1. The airflow treatment section performs homogenization and stabilization treatment on the airflow. The sound source section 5 emits the required sound waves. The sound waves flow with the airflow and pass over the test piece 12. The test piece 12 will absorb or reflect the sound waves. The acoustic probe 9 detects the changes in the sound waves inside the test chamber 6, thereby obtaining the acoustic performance of the test piece 12.

[0024] Example 2

[0025] Based on the aforementioned Example 1, see [link / reference] Figures 1 to 5 As shown, the airflow treatment section includes a connecting pipe 13 and a front silencer box 14. The two ends of the connecting pipe 13 are respectively connected to the damping section 4 and the sound source section 5. The front silencer box 14 is sleeved on the outer side of the connecting pipe 13 near the damping section 4. The inner side wall of the front silencer box 14 is covered with front filling material. A front silencer perforated plate 15 is provided between the outer side of the connecting pipe 13 and the front filling material so that a front air layer is formed between the front silencer perforated plate 15 and the front filling material. A honeycomb device 16 and a damping mesh 17 are sequentially provided inside the end of the connecting pipe 13 placed outside the front silencer box 14.

[0026] Specifically, the front sound-absorbing perforated plate 15 and the front filling material treat the noise generated by the high-speed fan 1, thereby reducing noise; the honeycomb unit 16 and the damping net 17 work together to homogenize and stabilize the airflow.

[0027] As a preferred embodiment, refer to Figures 1 to 5 As shown, the damping joint 4 includes a bellows 18 and a protective frame 19. The two ends of the bellows 18 are respectively connected to the heater 3 and the connecting pipe 13. The protective frame 19 is sleeved on the outside of the bellows 18 and is connected to the outer wall of the heater 3 and the outer wall of the front silencer box 14 at both ends.

[0028] Specifically, by setting the bellows 18, the vibration generated by the high-speed fan 1 can be eliminated, avoiding the impact on the sound source section 5, the test piece 12 and the acoustic probe 9. By setting the protective frame 19, the bellows 18 can be protected.

[0029] As a preferred embodiment, refer to Figures 1 to 5As shown, the sound source section 5 includes a sound source pipe 20. The two ends of the sound source pipe 20 are respectively connected to the connecting pipe 13 and the test chamber 6. The left and right side walls of the sound source pipe 20 are connected to the conduits 21. The end of the conduit 21 away from the sound source section 5 is connected to the speaker 22.

[0030] Specifically, by controlling the speaker 22 to emit sound, the speaker 22 emits the required sound waves, and the audio is introduced into the sound source tube 20 through the conduit 21, and then flows into the test chamber 6 with the airflow.

[0031] Example 3

[0032] Based on the aforementioned Example 1, see [link / reference] Figures 1 to 5 As shown, the end of the test chamber 6 away from the sound source section 5 is connected to a diffuser 23, and the diameter of the diffuser 23 gradually increases from the end closest to the sound source section 5 to the other end.

[0033] Specifically, by setting up a diffuser 23, the gas discharged from the test chamber 6 is stabilized to avoid changes in the front airflow caused by the turbulence of the rear airflow.

[0034] As a preferred embodiment, refer to Figures 1 to 5 As shown, a rear silencer box 24 is fitted on the outer side of the diffuser tube 23, and a rear filling material is laid on the inner side wall of the rear silencer box 24. A rear silencer perforated plate 25 is provided between the outer side of the diffuser tube 23 and the rear filling material, so that a rear air layer is formed between the rear silencer perforated plate 25 and the rear filling material.

[0035] Specifically, the rear silencing plate 25 and the rear filling material treat the noise generated by the airflow in the diffuser 23, thereby reducing noise.

[0036] Example 4

[0037] Based on the aforementioned Example 1, see [link / reference] Figures 1 to 5 As shown, the test chamber 6 has an installation frame 10 connected to its interior on the bottom outer wall. The bottom end of the installation frame 10 is sealed with a sealing plate 11. A movable plate 26 is slidably installed inside the installation frame 10. The movable plate 26 and the interior of the installation frame 10 exhibit a piston structure that slides to ensure that the airflow will not leak from the connection between the movable plate 26 and the installation frame 10, thereby ensuring the stability of the sound waves. A vertically arranged threaded rod 27 is threadedly connected to the sealing plate 11. The top end of the threaded rod 27 rotates and passes into the installation frame 10 and is rotatably connected to the bottom side of the movable plate 26. The bottom end of the threaded rod 27 rotates through the sealing plate 11 and is connected to a rotating disk 28. Vertically arranged limiting rods 29 are provided on the bottom side of the movable plate 26 on both sides of the threaded rod 27. The bottom end of the limiting rod 29 slides through the sealing plate 11. The test piece 12 is laid on the top side of the movable plate 26, and the side wall of the test piece 12 abuts against the top side wall of the installation frame 10.

[0038] Specifically, during use, the test piece 12 is placed on the top side of the moving plate 26. Rotating the rotating disk 28 causes the threaded rod 27 to rotate and engage with the sealing plate 11, thereby moving the moving plate 26 and consequently the test piece 12 placed on it. During the test, the height of the moving plate 26 can be adjusted to move the test piece 12 up and down, allowing sound waves to flow with the airflow and pass above the test piece 12. The test piece 12 will absorb or reflect sound waves. The acoustic probe 9 detects changes in the sound waves within the test chamber 6. The acoustic performance of the test piece 12 is determined by testing. It should be noted that the size of the test piece 12 is adapted to the size of the mounting frame 10. When the test piece 12 is placed on the top side of the moving plate 26 inside the top of the mounting frame 10, the top side wall of the mounting frame 10 can limit the test piece 12 to ensure the stability of the test piece 12 during testing. By setting the threaded rod 27, the rotating disk 28 and the limiting rod 19, the position of the moving plate 26 in the mounting frame 10 can be adjusted to facilitate the testing of test pieces 12 of different thicknesses.

[0039] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A high-temperature, high-flow-rate acoustic impedance flow tube, comprising a high-speed fan (1), characterized in that: The air outlet of the high-speed fan (1) is connected to a heater (3) through a fan connecting section (2). The diameter of the fan connecting section (2) gradually increases from one end near the high-speed fan (1) to the other end. The heater (3) is connected to a damping section (4) at the end away from the fan connecting section (2). The damping section (4) is connected to an airflow processing section at the end away from the heater (3). The airflow processing section is connected to a sound source section (5) at the end away from the damping section (4). The sound source section (5) is connected to a test chamber (6) at the end away from the airflow processing section. The test chamber (6) has a placement opening (7) at the top. A cover plate (8) is closed at the placement opening (7). Acoustic probes (9) that communicate with the inside of the test chamber (6) are evenly arranged on the cover plate (8). A test piece (12) is provided on the bottom side of the test chamber (6) directly opposite the acoustic probes (9).

2. The high-temperature, high-flow-rate acoustic impedance flow tube according to claim 1, characterized in that: The airflow treatment section includes a connecting pipe (13) and a front silencer box (14). The two ends of the connecting pipe (13) are respectively connected to the damping section (4) and the sound source section (5). The front silencer box (14) is sleeved on the outer side of the connecting pipe (13) near the damping section (4). The inner side wall of the front silencer box (14) is covered with front filling material. A front silencer perforated plate (15) is provided between the outer side of the connecting pipe (13) and the front filling material so that a front air layer is formed between the front silencer perforated plate (15) and the front filling material. A honeycomb device (16) and a damping mesh (17) are sequentially provided inside the end of the connecting pipe (13) placed outside the front silencer box (14).

3. The high-temperature, high-flow-rate acoustic impedance flow tube according to claim 2, characterized in that: The damping joint (4) includes a bellows (18) and a protective frame (19). The two ends of the bellows (18) are respectively connected to the heater (3) and the connecting pipe (13). The protective frame (19) is sleeved on the outside of the bellows (18) and is connected to the outer wall of the heater (3) and the outer wall of the front silencer box (14) at both ends.

4. The high-temperature, high-flow-rate acoustic impedance flow tube according to claim 3, characterized in that: The sound source section (5) includes a sound source pipe (20), and the two ends of the sound source pipe (20) are respectively connected to the connecting pipe (13) and the test chamber (6). The left and right side walls of the sound source pipe (20) are connected to conduits (21), and the end of the conduit (21) away from the sound source section (5) is connected to a horn (22).

5. A high-temperature, high-flow-rate acoustic impedance flow tube according to claim 1, characterized in that: The test chamber (6) is connected to a diffuser (23) at one end away from the sound source section (5), and the diameter of the diffuser (23) gradually increases from one end near the sound source section (5) to the other end.

6. A high-temperature, high-flow-rate acoustic impedance flow tube according to claim 5, characterized in that: A rear silencer box (24) is fitted on the outside of the diffuser tube (23), and a rear filling material is laid on the inner wall of the rear silencer box (24). A rear silencer perforated plate (25) is provided between the outside of the diffuser tube (23) and the rear filling material so that a rear air layer is formed between the rear silencer perforated plate (25) and the rear filling material.

7. A high-temperature, high-flow-rate acoustic impedance flow tube according to claim 1, characterized in that: The test chamber (6) has an installation frame (10) connected to its interior on the bottom outer wall. The bottom end of the installation frame (10) is sealed with a sealing plate (11). A movable plate (26) is slidably provided inside the installation frame (10). A vertically arranged threaded rod (27) is threadedly connected to the sealing plate (11). The top end of the threaded rod (27) rotates into the installation frame (10) and is rotatably connected to the bottom side of the movable plate (26). The bottom end of the threaded rod (27) rotates through the sealing plate (11) and is connected to a rotating disk (28). The bottom side of the movable plate (26) is provided with vertically arranged limiting rods (29) on both sides of the threaded rod (27). The bottom end of the limiting rod (29) slides through the sealing plate (11). The test piece (12) is laid on the top side of the movable plate (26).

Images