A fixture and method for testing air leakage in the front and rear cavities of a loudspeaker enclosure.

Abstract

This invention relates to the field of audio testing technology, and in particular to a testing fixture and method for testing air leakage in the front and rear cavities of a loudspeaker enclosure. The fixture includes a bottom mounting bracket for placing the loudspeaker enclosure, a lateral telescopic support rod mounted on the bottom mounting bracket, a centrifugal fan, an adjusting motor, and a pressure detection module. The present invention provides a testing fixture and method for testing air leakage in the front and rear cavities of a loudspeaker enclosure by using a lateral clamping method to compress and close the front and rear cavities, ensuring the stability of the enclosure during testing and thus improving the sealing of the assembly surfaces during testing. An internal adjusting disc, controlled by an adjusting motor, is movably mounted inside the lateral assembly ring. An internal adjusting guide rail is fixedly mounted on the inner side of the internal adjusting disc for assembly and adjustment. The operating status and position of the internal centrifugal fan can be adjusted as needed, and the position adjustment can be used to monitor and locate leak points.

Description

Technical Field

[0001] This invention relates to the field of audio testing technology, and in particular to a testing fixture and method for testing air leakage in the front and rear cavities of a loudspeaker enclosure. Background Technology

[0002] With the development of technology, wearable electronic products such as smartwatches and smart glasses are becoming increasingly popular. Wearable smart devices often utilize subwoofers, and subwoofers with open rear chambers offer a good solution due to their low resonant frequency, low power consumption, and smooth sound quality. However, the rear chamber of a subwoofer enclosure is inherently unsealed, making testing difficult, especially for wearable devices where the enclosure size is extremely small. To utilize space, the enclosure is often irregularly shaped to fit the form of the smart electronic product. This irregular design further complicates sealing tests. Since subwoofers require sealing the front and rear chambers during leakage design, if the front and rear chambers are connected, an acoustic short circuit will occur, reducing low-frequency performance and causing resonance peaks in the mid-to-high frequencies, affecting the listening experience. With conventional speakers where the rear chamber is closed, product performance curves can be used to screen for products with leakage in both chambers. For speakers with open rear chambers, the front and rear chambers are connected through the open section, making it impossible to distinguish between external and internal leakage in the test curves. In particular, when the shape of the open part is complex and irregular, it is difficult to seal the open part of the rear cavity with tooling. There is an urgent need for a new tooling on the market to solve the air leakage problem of such complex-shaped open speakers. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an improved testing fixture and method for air leakage testing of the front and rear cavities of a loudspeaker enclosure, in order to solve the problem that it is difficult to keep the testing position sealed, which leads to difficulties in testing internal leakage of open-cavity loudspeakers.

[0004] The technical solution adopted by this invention to solve its technical problem is: a speaker enclosure front and rear cavity leakage test fixture, including a bottom placement rack for placing the speaker enclosure, a lateral telescopic support rod installed on the bottom placement rack, a centrifugal fan, an adjusting motor, and a pressure detection module. The upper surface of the bottom placement rack has an upper storage slot for placing the speaker enclosure. The two sides of the bottom placement rack are movably fitted with flip brackets controlled by the lateral telescopic support rods. The top of the flip brackets is fixedly fitted with an integral lateral assembly ring. The lateral assembly ring is movably fitted with an internal adjusting plate controlled by the adjusting motor. An internal adjusting guide rail is fixedly fitted on the inner side of the internal adjusting plate. An internal control plate for installing the centrifugal fan and the pressure detection module is movably fitted on the internal adjusting guide rail.

[0005] The cylinder end of the lateral telescopic strut is movably mounted on the outer side of the bottom placement frame, and the telescopic end of the lateral telescopic strut is movably mounted on the side wall of the flipping bracket.

[0006] The outer side of the lateral assembly ring is fixedly fitted with an external assembly cover for installing the adjustment motor at the connecting end of the flip bracket. The outer arc surface of the inner adjustment plate is provided with an annular tooth groove that cooperates with the adjustment motor. An adjustment gear that meshes with the annular tooth groove is axially fixed on the adjustment shaft of the adjustment motor.

[0007] An adjusting screw is movably mounted inside the internal adjusting guide rail. A top control motor for controlling the adjusting screw is axially mounted at the top of the internal adjusting guide rail. The internal control panel is inserted into the internal adjusting guide rail and threadedly assembled with the adjusting screw via an integrated internal thread adjusting seat.

[0008] A circular adjustment chamber is provided on the side wall of the internal control panel. An adjustment control cover for installing a centrifugal fan is slidably fitted inside the circular adjustment chamber. An external closed cover is fixedly fitted on the outer side of the internal control panel at the opening of the circular adjustment chamber. A flexible lateral air supply pipe is fixedly fitted on the outer side of the internal control panel.

[0009] A lateral telescopic motor for controlling the extension and retraction of the control cover is fixedly mounted on the outer wall of the internal control panel away from the opening of the circular adjustment chamber.

[0010] The pressure detection module is fixedly installed on the external closed housing.

[0011] The part of the side assembly ring that contacts the speaker is made of silicone or compressible foam material.

[0012] A method for testing air leakage in the front and rear cavities of a loudspeaker enclosure involves first placing the speaker enclosure into the upper storage slot of a testing fixture. Then, a lateral telescopic support rod is used to control a flipping bracket to clamp the speaker enclosure from both sides, applying a certain pressure to both sides to create a relatively sealed area between the front and rear cavities of the speaker enclosure and the interior of the internal adjustment plate. A centrifugal fan inside the internal adjustment plate blows air intermittently into the front and rear cavities of the product. A pressure detection module is used to detect the change in air pressure over time. The attenuation value of the air pressure after maintaining pressure for a certain period of time is used to determine whether there is air leakage in the front and rear cavities of the speaker enclosure.

[0013] The beneficial effects of this invention are:

[0014] (1) The speaker enclosure front and rear cavity leakage test fixture and test method of the present invention uses a lateral clamping method to squeeze and close the front and rear cavities of the speaker, ensuring the stability of the speaker during the test process, thereby improving the sealing of the assembly surface during the test process;

[0015] (2) An internal adjustment plate controlled by an adjustment motor is installed inside the lateral assembly ring. An internal adjustment guide rail is fixedly installed on the inner side of the internal adjustment plate to assemble and adjust the internal control plate. The operating status and position of the internal centrifugal fan can be adjusted as needed. The leakage point can be monitored by adjusting the position, which makes it convenient to locate the leakage point.

[0016] (3) The centrifugal fan on the internal adjustment plate can perform blowing and evacuation operations as needed, making the testing methods more diverse and the monitoring data more accurate. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the internal adjustment disc in this invention.

[0020] Figure 3 This is a schematic diagram of the centrifugal fan assembly end in this invention. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Figure 1 , Figure 2 and Figure 3The above describes a speaker enclosure front and rear cavity leakage test fixture, which includes a bottom mounting bracket 1 for placing the speaker enclosure, a lateral telescopic support rod 2 mounted on the bottom mounting bracket 1, a centrifugal fan 3, an adjusting motor 4, and a pressure detection module 5. The upper surface of the bottom mounting bracket 1 has an upper storage slot 6 for placing the speaker enclosure. The bottom mounting bracket 1 has movably mounted flip brackets 7 controlled by the lateral telescopic support rod 2 on both sides. The top of the flip bracket 7 is fixedly mounted with an integral lateral mounting ring 8. The lateral mounting ring 8 has an internal adjusting plate 9 controlled by the adjusting motor 4 movably mounted inside. The inner side of the internal adjusting plate 9 is fixedly mounted with an internal adjusting guide rail 10. The internal adjusting guide rail 10 has an internal control plate 11 for mounting the centrifugal fan 3 and the pressure detection module 5 movably mounted on the internal adjusting guide rail 10.

[0024] The lateral telescopic support rod 2, centrifugal fan 3, regulating motor 4, and pressure detection module 5 are existing technologies. The speaker is placed inside the upper storage slot 6, and then the lateral telescopic support rod 2 is activated. The lateral telescopic support rod 2 controls the flip bracket 7 to press and fix the speaker from both sides.

[0025] In order to facilitate the adjustment of the angle of the flip bracket 7, the cylinder end of the lateral telescopic support rod 2 is movably mounted on the outer side of the bottom placement frame 1, and the telescopic end of the lateral telescopic support rod 2 is movably mounted on the side wall of the flip bracket 7.

[0026] In order to facilitate the angle adjustment of the internal adjustment disc 9, an external assembly cover for installing the adjustment motor 4 is fixedly mounted on the outer side of the lateral assembly ring 8 at the connecting end of the flip bracket 7. An annular toothed groove 13 that cooperates with the adjustment motor 4 is opened on the outer arc surface of the internal adjustment disc 9. An adjustment gear 14 that meshes with the annular toothed groove 13 is axially fixed on the adjustment shaft of the adjustment motor 4.

[0027] In order to adjust the position of the internal control panel 11 and thus improve the detection range, an adjusting screw 15 is movably mounted in the internal adjusting guide rail 10. A top control motor 16 for controlling the adjusting screw 15 is axially mounted at the top of the internal adjusting guide rail 10. The internal control panel 11 is inserted into the internal adjusting guide rail 10 and threadedly assembled with the adjusting screw 15 through an integrated internal thread adjusting seat 17.

[0028] To facilitate adjustment and control of air extraction and blowing, a circular adjustment chamber 18 is provided on the side wall of the internal control panel 11. An adjustment control cover 19 for installing the centrifugal fan 3 is slidably installed inside the circular adjustment chamber 18. An external closed cover 20 is fixedly installed on the outer side of the internal control panel 11 at the opening of the circular adjustment chamber 18. A flexible lateral air supply pipe 21 is fixedly installed on the outer side of the internal control panel 11.

[0029] To facilitate the adjustment of the position of the adjustment control cover 19, a lateral telescopic motor 22 for controlling the extension and retraction of the adjustment control cover 19 is fixedly mounted on the outer wall of the inner control panel 11 away from the opening of the circular adjustment chamber 18.

[0030] The top control motor 16 and the side telescopic motor 22 are existing technologies.

[0031] When the lateral telescopic motor 22 controls the adjustment control cover 19 to extend outward, the adjustment control cover 19 is pressed outward to the inside of the outer closed cover 20. At this time, the outer closed cover 20 closes the external opening of the adjustment control cover 19. The internal opening of the adjustment control cover 19 is connected to the flexible lateral air supply pipe 21. When the centrifugal fan 3 rotates, it blows air outward through the side opening on the arc-shaped surface, and then draws air in through the flexible lateral air supply pipe 21, forming a positive pressure inside the sealed chamber. When the lateral telescopic motor 22 controls the adjustment control cover 19 to retract inward, the adjustment control cover 19 retracts into the circular adjustment chamber 18. At this time, the internal opening of the adjustment control cover 19 is closed, the external opening is open, and the side opening is connected to the flexible lateral air supply pipe 21. The centrifugal fan 3 rotates to draw air out of the sealed chamber, and then discharges air through the flexible lateral air supply pipe 21, forming a negative pressure inside the sealed chamber.

[0032] To facilitate pressure detection of the chamber from the outside, the pressure detection module 5 is fixedly installed on the outer closed cover 20.

[0033] To improve the sealing of the extrusion surface, the part of the side assembly ring 8 that contacts the speaker is made of silicone or compressible foam material.

[0034] A method for testing air leakage in the front and rear cavities of a loudspeaker enclosure involves first placing the speaker enclosure into the upper storage slot 6 of the testing fixture. Then, using the lateral telescopic support rod 2, the flipping bracket 7 is used to clamp the speaker enclosure from both sides, applying a certain pressure to both sides to create a relatively sealed area between the front and rear cavities of the speaker enclosure and the interior of the internal adjustment plate 9. The centrifugal fan 3 inside the internal adjustment plate 9 blows air intermittently into the front and rear cavities of the product. The pressure detection module 5 detects the change in air pressure over time. The attenuation value of the air pressure after maintaining the pressure for a certain period of time determines whether the front and rear cavities of the speaker enclosure are leaking.

[0035] By activating centrifugal fan 3, air is blown into the front cavity from one side, creating a positive pressure state. The rear cavity is sealed to the acoustic chamber housing with glue via lateral mounting ring 8 and internal adjusting disc 9. After reaching equilibrium, centrifugal fan 3 stops blowing air, and the pressure sensor reads the pressure change over a period of time (e.g., after 3 seconds) to determine if the pressure change exceeds the allowable limit, thus determining OK / NG. The same method is used to test the front cavity; alternatively, air can be blown and drawn from both sides separately, which can improve the effect of internal pressure change. If the positive and negative pressures on both sides cannot increase, it indicates a leak; if the positive and negative pressures on both sides begin to increase, it indicates no leak. Then, the blowing and drawing positions are interchanged, which avoids the false seal caused by one-way check valves due to obstruction at the damaged location, thereby improving detection accuracy. At the same time, by changing the position of the pressure detection module 5, the leak point can be accurately located based on the pressure change, making detection more convenient.

[0036] This invention provides a speaker enclosure front and rear cavity leakage testing fixture and method. By employing a lateral clamping method to compress and close the front and rear cavities of the speaker enclosure, the stability of the enclosure during testing is ensured, thereby improving the sealing of the assembly surfaces during the testing process. An internal adjustment disc 9, controlled by an adjustment motor 4, is movably mounted inside the lateral assembly ring 8. An internal adjustment guide rail 10 is fixedly mounted on the inner side of the internal adjustment disc 9 to assemble and adjust the internal control disc 11. The operating status and position of the internal centrifugal fan 3 can be adjusted as needed, allowing for monitoring of leakage points and facilitating leak location. The centrifugal fan 3 on the internal adjustment disc 9 can perform blowing and evacuation operations as needed, making the testing methods more diverse and the monitoring data more accurate.

[0037] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A fixture for testing air leakage in the front and rear cavities of a loudspeaker enclosure, comprising a bottom mounting bracket (1) for placing the loudspeaker enclosure, a lateral telescopic support rod (2) mounted on the bottom mounting bracket (1), a centrifugal fan (3), an adjusting motor (4), and a pressure detection module (5), characterized in that: The upper surface of the bottom placement rack (1) is provided with an upper placement slot (6) for placing a loudspeaker cabinet, both sides of the bottom placement rack (1) are movably provided with a turnover support (7) controlled by a lateral telescopic support rod (2), the top end of the turnover support (7) is fixedly provided with an integrated lateral assembly ring (8), the inside of the lateral assembly ring (8) is movably provided with an internal adjusting disc (9) controlled by an adjusting motor (4), the inner side of the internal adjusting disc (9) is fixedly provided with an internal adjusting guide rail (10), and the internal adjusting guide rail (10) is movably provided with an internal control disc (11) for mounting a centrifugal fan (3) and a pressure detection module (5). A circular adjusting cavity (18) is formed in the side wall of the internal control disc (11), the internal control disc (11) is slidably provided with an adjusting control cover (19) for mounting the centrifugal fan (3), the outer side of the internal control disc (11) is fixedly provided with an external closing cover (20) at the opening position of the circular adjusting cavity (18), and the outer side of the internal control disc (11) is fixedly provided with a flexible lateral air conveying pipe (21). An external telescopic motor (22) is fixedly arranged on the outer side of the internal control disc (11) away from the opening outer wall of the circular adjusting cavity (18) and used for controlling the telescoping of the adjusting control cover (19).

2. The speaker box front and rear cavity air leakage test tooling according to claim 1, characterized in that: The cylinder end of the lateral telescopic support rod (2) is movably arranged on the outer side of the bottom placement rack (1), and the telescopic end of the lateral telescopic support rod (2) is movably arranged on the side wall of the turnover support (7).

3. The speaker box front and rear cavity air leakage test tooling of claim 1, characterized in that: An external assembly cover for mounting the adjusting motor (4) is fixedly arranged on the outer side of the lateral assembly ring (8) at the connecting end of the turnover support (7), an annular gear slot (13) matched with the adjusting motor (4) is formed in the outer side arc surface of the internal adjusting disc (9), and an adjusting gear (14) engaged with the annular gear slot (13) is fixedly arranged on the adjusting shaft of the adjusting motor (4).

4. The speaker box front and rear cavity air leakage test tooling of claim 1, characterized in that: An adjusting screw (15) is movably arranged in the internal adjusting guide rail (10), a top control motor (16) for controlling the adjusting screw (15) is arranged on the top end of the internal adjusting guide rail (10) in an axial manner, and the internal control disc (11) is inserted into the internal adjusting guide rail (10) and is threadedly arranged with the adjusting screw (15) through an integrated internal threaded adjusting seat (17).

5. The speaker box front and back cavity air leakage test tooling of claim 1, characterized in that: The pressure detection module (5) is fixedly arranged on the external closing cover.

6. The speaker box front and back cavity air leakage test tooling of claim 1, characterized in that: The material of the contact part of the lateral assembly ring (8) with the cabinet is silica gel or foam compressible material.

7. A test method based on the test tooling for testing air leakage of front and rear cavities of a loudspeaker cabinet according to any one of claims 1-6, characterized in that: Firstly, the cabinet is placed in the upper placement slot (6) of the test tool, then the turnover support (7) is controlled by the lateral telescopic support rod (2) to clamp the sound equipment from both sides, a certain pressure is applied to both sides of the cabinet, the front and rear cavities of the cabinet form a relatively sealed area with the inside of the internal adjusting disc (9), the centrifugal fan (3) in the internal adjusting disc (9) blows air to the front and rear cavities of the product at intervals, the pressure detection module (5) detects the change law of air pressure with time, and whether the front and rear cavities of the cabinet leak is determined according to the decay value of air pressure after pressure maintaining for a certain period of time.

Images