True water detection method and device for acoustic waterproof element

Abstract

The invention relates to a true water detection method for an acoustic waterproof element, and the method comprises the steps: placing a detected object on a jig, and enabling the detected object and the lower part of the jig to form a closed loop; filling high-pressure gas into the closed loop, standing for a preset time, and monitoring the air pressure change; after gas detection is completed, water is continuously injected into the closed loop, and residual gas in the closed loop is fully replaced by the water in the flowing process; after the residual gas is discharged, preset air pressure is applied to the water body and kept constant, and the change of the air pressure in the keeping stage is monitored. By designing a closed loop, the trouble of replacing equipment in the traditional method is avoided. In the gas detection stage, the gas permeability is accurately judged through a high-pressure gas filling loop; after gas detection is completed, water is continuously injected to replace residual gas, preset air pressure is applied to the water body to keep constant pressure, and it is ensured that the waterproof performance can be accurately judged in the constant-pressure stage. According to the method, the accuracy, reliability and efficiency of detection are improved, the misjudgment rate is reduced, and the equipment structure is simplified.

Description

Technical Field

[0001] This application relates to the field of electronic product manufacturing and testing technology, and in particular to a method and apparatus for testing the true water content of an acoustic waterproof component. Background Technology

[0002] Smartphones, wearable devices, and audio electronic products typically include acoustic components such as microphones, headsets, and speakers. These components generally have an acoustic protective structure that allows air to pass through but prevents liquids from penetrating the internal cavity, thereby improving the overall waterproof performance and acoustic stability of the device.

[0003] To verify the protective performance of the aforementioned acoustic components, air permeability testing and real water testing are typically performed during the production and testing process. Air permeability testing confirms the component's gas permeability, while real water testing determines whether the waterproof structure leaks.

[0004] In industry practice, these two tests are typically performed using different equipment or procedures. The gas permeability is tested first in a gas detection system, and then the waterproofing performance is tested in a water detection system. This separation is because gas detection and water detection differ significantly in their media, pressure conditions, and testing mechanisms. If performed together in the same process or equipment, the test results can easily interfere with each other, affecting the overall accuracy and stability.

[0005] However, with increasing demands for detection efficiency and the trend towards equipment integration, the problem of media interference between gas detection and real water detection is becoming increasingly prominent. Especially in detection chambers or water channels, localized bubbles or residual liquid often form after gas detection. These bubbles are compressed during subsequent liquid pressurization, and the gas within may escape through the permeable structure of the tested element, causing abnormal changes in the detection pressure. The detection system is prone to misinterpreting this pressure fluctuation caused by bubble expulsion as a leakage signal from liquid penetration, leading to misjudgments and inconsistencies in the detection results.

[0006] Therefore, it is evident that in existing detection processes, the interference between gas detection and real water detection is the main problem affecting the accuracy and reliability of detection, especially the pressure fluctuations caused by residual bubbles, which can easily lead to misjudgments in the detection results.

[0007] Therefore, it is necessary to provide a testing method and device that can effectively avoid interference from residual air bubbles and improve the accuracy of waterproof testing of acoustic components. Summary of the Invention

[0008] The purpose of this application is to provide a testing method and apparatus for acoustic waterproof components, which completes ventilation testing and real water testing sequentially within the same testing process, and reduces the mutual interference between the two types of testing through media management and residual gas treatment, thereby improving the accuracy, stability and consistency of the test results.

[0009] According to one aspect of this application, a method for detecting true water in an acoustic waterproof element is provided, the method comprising the steps of: Place the object to be tested on the fixture, so that it forms a closed circuit with the area below the fixture; High-pressure gas is introduced into the closed circuit, and the gas pressure is monitored after a preset time. The air permeability is deemed qualified when the gas pressure returns to normal pressure; otherwise, it is deemed unqualified. After the gas detection is completed, water is continuously injected into the closed circuit so that the water can fully replace the residual gas in the closed circuit during the flow process. After the residual gas is removed, a preset air pressure is applied to the water body and kept constant. The change of air pressure during the holding phase is monitored. When the air pressure drops, it is determined that the tested object is leaking water. When it remains stable, it is determined that the waterproof performance is qualified.

[0010] More preferably, one end of the closed circuit is connected to the water outlet of the water tank, and the other end is connected to the water inlet of the water tank. A true water control box is provided between the closed circuit and the water outlet of the water tank. When "water is continuously injected into the closed loop", the water in the water tank first flows into the real water control box. High-pressure gas is injected into the real water control box to push the water to continuously enter the closed loop. The water flows along the closed loop past the bottom of the test object and back to the water inlet of the water tank. During the flow, it displaces the residual gas in the closed loop and carries the residual gas back to the water tank.

[0011] More preferably, the sealed circuit includes: The detection section is located below the object being tested; The water injection section is located between the detection section and the real water control box; The water outlet section is located between the detection section and the water inlet end of the water tank; The top surface is recessed downward to form an annular groove and a boss surrounded by the annular groove. A sealing ring is provided in the annular groove, and the sealing ring is higher than the top surface of the boss, so as to form an open cavity between the sealing ring and the top surface of the boss. The object to be tested is placed on the top surface of the sealing ring and completely covers the open cavity to form the detection section; The water injection section and the water outlet section are integrally formed in the fixture and respectively penetrate the top surface of the boss and communicate with the detection section; During the continuous injection of water into the closed circuit, the water enters the detection section through the injection section and then enters the outlet section. When “applying a preset air pressure to the water body and maintaining a constant pressure, and monitoring the change in air pressure during the holding phase”, the water body should at least fully replace the residual gas in the water injection section and the detection section during the flow process.

[0012] More preferably, when viewed vertically, the outer contour shape and size of the sealing ring are adapted to the outer contour shape and size of the object being measured, a limiting member is provided around the outer periphery of the sealing ring, and a pressing member is provided directly above the boss; When the object to be tested is placed on the top surface of the sealing ring, the limiting member limits the object to be tested inward around the outer periphery, and the pressing member abuts against the object to be tested from top to bottom, so that the object to be tested and the sealing ring are fully pressed together to form a sealed detection section above the cavity. When water is continuously injected into the closed circuit, the water, propelled by high-pressure gas, passes through the detection section and carries away the residual gas in the detection section as it flows through the detection section. When “a preset air pressure is applied to the water body and kept constant, and the change of air pressure is monitored during the holding phase”, the switch between the water outlet section and the water inlet of the water tank is closed, and the water body pushed by high-pressure gas is in the pressurized holding phase. During the holding phase, pressurized water rises to contact the object being tested. When the waterproof performance of the object is qualified, the water is held within the testing section, and the pressure of the water and the pressure of the high-pressure gas remain constant. When the waterproof performance of the object is unqualified, the water is discharged upward through the object, the water volume in the injection section decreases, the space filled by the high-pressure gas increases, but the total amount of gas remains unchanged, and the gas pressure decreases. Thus, by judging whether the gas pressure decreases or remains constant, the waterproof performance of the object is determined.

[0013] More preferably, the portion of the water injection section that penetrates the boss is referred to as the first water injection part, and the first water injection part is arranged in the vertical direction; When "water is continuously injected into the closed circuit", the water flows into the detection section from bottom to top and impacts the test object located above the cavity. If the waterproof performance of the test object is unqualified, the water will pass through the test object during the water injection stage. By observing whether water seeps out during the water injection stage, it can be determined whether the waterproof performance of the test object is qualified.

[0014] The portion of the water outlet section that penetrates the protrusion is referred to as the first water outlet section, and the first water outlet section is arranged in the vertical direction; When “applying a preset air pressure to the water body and maintaining a constant pressure, and monitoring the change of air pressure during the holding phase”, gravity is used to avoid residual gas in the water outlet section from interfering with the detection in the detection section.

[0015] More preferably, the portion of the water injection section connected to the real water control box is referred to as the second water injection section, and the second water injection section is arranged in the horizontal direction; The water outlet section is indirectly connected to the water inlet of the water tank through the real water control box, and the switch between the water outlet section and the water inlet of the water tank is integrated into the real water control box. The portion of the water outlet section connected to the real water control box is referred to as the second water outlet section, which is configured in a horizontal direction.

[0016] More preferably, the true water control box includes: The generator has one end connected to the second water injection section and the other end connected to the water tank and the air outlet of the air tightness detector. The water in the water tank is drawn into the generator, and the air outlet of the air tightness detector outputs high-pressure air. The air pressure in the air tightness detector is detected by the principle that the air pressure is equal everywhere in the same connected air path. The return pipe is connected at one end to the inlet of the water tank and at the other end to the second outlet of the outlet section.

[0017] More preferably, the true water control box further includes: A first switch is located between the generator and the second water injection section; The second switch is located between the return pipe and the water inlet of the water tank; When "water is continuously injected into the closed circuit", both the first switch and the second switch are in the open state; When “a preset air pressure is applied to the water body and kept constant, and the change of air pressure during the holding phase is monitored”, the first switch is in the open state and the second switch is in the closed state.

[0018] More preferably, the true water control box further includes: The third switch is located between the generator and the water tank; The fourth switch is located between the generator and the air outlet of the air tightness detector; When water is continuously injected into the closed circuit, the third switch and the fourth switch are in the open state; When “a preset air pressure is applied to the water body and kept constant, and the change of air pressure during the holding phase is monitored”, the third switch is in the closed state and the fourth switch is in the open state. When "high-pressure gas is introduced into the closed circuit and the pressure change is monitored after a preset time", the first switch is in the open state, the second switch is in the closed state, the third switch is in the closed state, and the fourth switch is in the open state.

[0019] More preferably, the real water detection device includes: a fixture, a real water control box connected to the fixture, and a water tank and an airtightness detector connected to the real water control box; The object to be tested is placed on the fixture, and the object to be tested and the area below the fixture form a closed circuit; The real water control box fills the closed circuit with high-pressure gas. After standing for a preset time, the air tightness tester monitors the change in air pressure. When the air pressure returns to normal pressure, the air permeability is deemed qualified; otherwise, it is deemed unqualified. After the gas detection is completed, the real water control box draws water from the water tank and continuously injects water into the closed loop, so that the water can fully replace the residual gas in the closed loop during the flow process. After the residual gas is removed, the real water control box extracts high-pressure gas from the airtightness detector to apply a preset air pressure to the water body and maintain a constant pressure. The change of air pressure during the holding phase is monitored. When the air pressure drops, it is determined that the tested object is leaking water. When it remains stable, it is determined that the waterproof performance is qualified.

[0020] This application has the following beneficial effects: By designing a closed loop, sequential linkage between air permeability testing and real water testing is achieved, avoiding the inconvenience of equipment replacement required in traditional methods. During the gas detection phase, high-pressure gas is injected into the loop to accurately determine air permeability. After gas detection, water is continuously injected to displace residual gas, and a preset pressure is applied to the water body to maintain constant pressure, ensuring accurate determination of waterproof performance during the constant pressure phase. This method improves the accuracy, reliability, and efficiency of testing, reduces the false positive rate, and simplifies the equipment structure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the true water detection device according to one embodiment of this application; Figure 2 This is an exploded top view of the true water detection device according to one embodiment of this application; Figure 3This is an exploded bottom view of the true water detection device according to one embodiment of this application; Figure 4 This is a partially enlarged schematic diagram of the fixture described in one embodiment of this application; Figure 5 This is an exploded front view of the true water detection device according to one embodiment of this application; Figure 6 This is a three-dimensional front view of the true water detection device according to one embodiment of this application; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure at point AA; Figure 8 This is a three-dimensional side view of the true water detection device according to one embodiment of this application; Figure 9 for Figure 8 Schematic diagram of the cross-sectional structure at point BB; Figure 10 for Figure 9 A magnified view of a section at point C; Figure 11 This is a flowchart of the true water detection device according to one embodiment of this application; Figure 12 This is a detailed flowchart of the true water detection device according to one embodiment of this application; Figure 13 This is a flowchart of the switch control process of the true water detection device according to one embodiment of this application; Figure 14 This is an internal structural diagram of the true water control box according to one embodiment of this application; Explanation of icon numbers: 100. True water detection device; 110. Measured object; 10. Fixture; 20. Closed circuit; 30. Water tank; 40. True water control box; 201. Detection section; 202. Water injection section; 203. Water outlet section; 101. Annular groove; 102. Boss; 103. Sealing ring; 50. Open cavity; 60. Limiting component; 70. Abutting component; 401. Switch; 2021. First water injection section; 2031, First water outlet; 2022, Second water injection section; 2032, Second water outlet; 402, Generator; 80, Air tightness tester; 801, Air outlet; 403, Return pipeline; 301, Water outlet; 302, Water inlet; 4011, First switch; 4012, Second switch; 4013, Third switch; 4014, Fourth switch; X, Horizontal direction; Z, Vertical direction. Detailed Implementation

[0023] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0024] See Figures 1 to 10 The acoustic waterproof element true water detection method of one embodiment of this application can be applied to a true water detection device 100. The device 100 includes a fixture 10 for holding the test object 110, a closed circuit 20 connected to the fixture 10, a water tank 30 connected to the water outlet and water inlet of the closed circuit 20, a true water control box 40 connected to the closed circuit 20 and the water tank 30, and an airtightness detector 80 connected to the air outlet of the true water control box 40. Through the cooperation of the above components, air permeability detection and true water detection can be completed sequentially in the same detection process, and active replacement of residual gas can be completed between the two detections.

[0025] Specifically, the top surface of the fixture 10 is recessed downwards to form an annular groove 101 and a boss 102 surrounded by the annular groove 101. A sealing ring 103 is disposed within the annular groove 101. The height of the sealing ring 103 is greater than the height of the top surface of the boss 102, thereby forming an open cavity 50 between the sealing ring 103 and the top surface of the boss 102. During testing, the object to be tested 110 is placed above the sealing ring 103 and completely covers the open cavity 50, thereby forming a downward-facing testing section 201 between the object to be tested 110 and the fixture 10. To ensure that the test object 110 remains stable and sealed during the testing process, the outer periphery of the fixture 10 is provided with a limiting member 60 for circumferentially limiting the test object 110. A stop member 70 can also be movably provided above the fixture 10. The stop member 70 presses the test object 110 downward in the vertical direction Z, so that the test object 110 and the sealing ring 103 form a reliable surface contact seal, thereby keeping the testing section 201 in a sealed state above.

[0026] In this embodiment, the closed circuit 20 may include a water injection section 202, a detection section 201, and a water outlet section 203 connected in sequence. The water injection section 202 is located between the detection section 201 and the real water control box 40, and the water outlet section 203 is located between the detection section 201 and the water inlet 302 of the water tank 30. To facilitate sufficient replacement of residual gas by the water in the early stage of detection, the water injection section 202 forms a first water injection part 2021 at the portion penetrating the boss 102. The first water injection part 2021 is arranged vertically in the Z direction, allowing the water supplied from the real water control box 40 to directly enter the detection section 201 from bottom to top and impact the object 110 being tested. A second water injection part 2022 is formed at the portion of the water injection section 202 that is away from the fixture 10 and connected to the real water control box 40. The second water injection part 2022 extends horizontally in the X direction for reliable connection with the water outlet (or generator outlet) of the real water control box 40. Similarly, the water outlet section 203 forms a first water outlet 2031 at the part that penetrates the boss 102. The first water outlet 2031 is arranged in the vertical direction Z, which facilitates the discharge of residual gas in the detection section 201 by gravity and water flow. The water outlet section 203 forms a second water outlet 2032 at the part that communicates with the real water control box 40. The second water outlet 2032 extends in the horizontal direction X and finally communicates with the water inlet 302 of the water tank 30 through the real water control box 40. With this arrangement, the detection section 201 is at the top, and both water injection and drainage can form an "in-out" passage in the vertical direction, which can effectively reduce the retention of local air bubbles.

[0027] The external parts of the real water control box 40 are provided with an inlet port connected to the outlet 301 of the water tank 30, a return port connected to the inlet 302 of the water tank 30, and a gas port connected to the outlet 801 of the airtightness detector 80. The real water control box 40 can integrate a generator 402 to send water from the water tank 30 to the water injection section 202 under the propulsion of high-pressure gas; it is also provided with a return pipe 403 to guide the water discharged from the outlet section 203 and the residual gas it carries back to the water tank 30. To accommodate three different stages—ventilation detection, continuous water replacement, and constant pressure maintenance—the real water control box 40 is equipped with multiple independently controllable switches 401. Specifically, these include a first switch 4011, a second switch 4012, a third switch 4013, and a fourth switch 4014. These four switches are respectively located on the outlet side of the generator 402, the return pipe 403, between the water tank 30 and the generator 402, and between the airtightness detector 80 and the generator 402. This allows the real water control box 40 to selectively open or close the corresponding pathways according to the detection stage.

[0028] Furthermore, the sealed circuit 20 can be specifically configured as a detection section 201, a water injection section 202, and a water outlet section 203 connected in sequence. The detection section 201 is located below the object under test 110, used to contain pressurized water during the real water detection stage and is positioned opposite the waterproof structure of the object under test 110. The water injection section 202 is located between the detection section 201 and the real water control box 40, used to guide the water pushed from the real water control box 40 into the detection section 201. The water outlet section 203 is located between the detection section 201 and the water inlet 302 of the water tank 30, used to guide the water flowing through the detection section 201 and any residual gas it carries back to the water tank 30.

[0029] Specifically, the top surface of the fixture 10 can be recessed downwards to form an annular groove 101 and a boss 102 surrounded by the annular groove 101. A sealing ring 103 is installed in the annular groove 101, and the height of the sealing ring 103 is higher than the top surface of the boss 102, thereby forming an upward-facing open cavity 50 between the upper surface of the sealing ring 103 and the top surface of the boss 102. During testing, the object to be tested 110 is placed on the top surface of the sealing ring 103, and the object to be tested 110 completely covers the open cavity 50, thus forming a downwardly closed testing section 201 between the object to be tested 110 and the fixture 10. Since the sealing ring 103 is higher than the top surface of the boss 102, the object to be tested 110 can first achieve surface contact sealing with the sealing ring 103 after being pressed. The boss 102 plays a supporting and positioning role. This ensures the airtightness of the testing section 201 from above, and the sealing effect is not affected by the slight shape and position errors of the fixture 10.

[0030] To facilitate water injection and drainage, the injection section 202 and the outlet section 203 can be integrally formed with the fixture 10 and respectively penetrate the top surface of the boss 102 and communicate with the detection section 201. Thus, when the real water control box 40 continuously injects water into the closed circuit 20, the water first flows through the injection section 202 into the upper detection section 201, then flows from the detection section 201 to the outlet section 203, and finally returns to the water tank 30. Since the injection section 202 and the outlet section 203 are both directly connected to the detection section 201, and the three form a closed waterway in space, the water can push out any residual gas that was previously trapped in the injection section 202 and the detection section 201 due to gas detection during the flow process. The residual gas then enters the outlet section 203 along with the water and is carried back to the water tank 30, achieving active replacement of the key detection chamber. Subsequently, before or simultaneously with the stage of “applying a preset air pressure to the water body and maintaining a constant pressure, and monitoring the change of air pressure during the holding phase”, as long as the continuous water injection has fully replaced the residual gas in the water injection section 202 and the detection section 201, a constant pressure determination can be performed in a liquid-dominated environment, avoiding false air pressure drops caused by the compression of air bubbles, thereby improving the accuracy and repeatability of real water detection.

[0031] Furthermore, one end of the closed loop 20 is connected to the outlet 301 of the water tank 30, and the other end is connected to the inlet 302 of the water tank 30. A real water control box 40 is provided between the closed loop 20 and the outlet 301 of the water tank 30. With this arrangement, the water tank 30 can serve as a unified water source and return container, while the real water control box 40 is used to introduce high-pressure gas into the water circuit and control water injection, return flow, and maintain the on / off state at each stage.

[0032] Specifically, during the stage of "continuously injecting water into the closed loop," the first switch 4011 and the second switch 4012 installed on the real water control box 40 can be opened first, allowing water from the water tank 30 to enter the real water control box 40 through the outlet 301. Simultaneously, the outlet 801 of the airtightness detector 80 is connected to the real water control box 40, allowing high-pressure gas to be injected into the interior of the real water control box 40. A generator 402 is installed inside the real water control box 40. The generator 402 combines the water from the water tank 30 with the high-pressure gas, and the high-pressure gas applies a thrust to the water, causing the water to be continuously transported along the water injection section 202 of the closed loop 20 to the detection section 201 in the fixture 10. Since the water injection section 202 extends through the fixture 10 to the bottom of the test object 110, the water will flow from bottom to top across the lower surface of the test object 110 after entering the detection section 201, and then return to the real water control box 40 through the water outlet section 203, and finally be sent back to the water inlet 302 of the water tank 30 by the real water control box 40 through the return pipe 403.

[0033] During the aforementioned water circulation process, residual gas originally trapped in the injection section 202, detection section 201, and outlet section 203 is pushed out by the advancing water. This residual gas is carried into the outlet section 203 and discharged back into the water tank 30 along with the return water via the true water control box 40, thereby achieving active replacement of the interior of the closed loop 20. Since the water comes out of the water tank 30, is pressurized and transported by the true water control box 40, and then returns to the water tank 30, the entire loop is a closed loop. Therefore, air or mixed media will not accumulate near the detection device, and the normal operation of the airtightness detector 80 will not be affected by water backflow. Through the above structure, after completing the gas detection in the previous stage, the same closed loop 20 can be immediately flushed with water and air bubbles removed, establishing a water path environment with virtually no residual gas for subsequent constant pressure true water detection, thereby effectively avoiding misjudgments caused by pressure fluctuations due to the compression of residual gas during the pressurization stage.

[0034] Furthermore, the sealing area of ​​the fixture 10 can be designed as a limiting and pressing structure that corresponds one-to-one with the shape of the object under test 110. Specifically, viewed along the vertical Z direction, the outer contour shape and size of the sealing ring 103 set in the annular groove 101 are adapted to the outer contour shape and size of the object under test 110, so that after the object under test 110 is placed in position, its outer edge basically falls within the enclosure of the sealing ring 103. To prevent the object under test 110 from radial displacement during water injection or pressurization, several circumferentially distributed limiting members 60 are also provided on the outer periphery of the sealing ring 103. The limiting members 60 tighten inward relative to the sealing ring 103, which can limit and position the object under test 110 from the outer periphery inward, thereby ensuring that the outer edge of the object under test 110 is always pressed on the top surface of the sealing ring 103.

[0035] To further improve the reliability of the upper seal, an adjustable or flip-up pressing member 70 is provided directly above the boss 102. The pressing member 70 can be a pressure plate, a pressure cap, or a support structure with a pressure head, with its bottom surface facing the upper surface of the object being tested 110. When the object being tested 110 is placed on the top surface of the sealing ring 103, the pressing member 70 presses down vertically in the Z direction, simultaneously confining the object being tested 110 between the "lower sealing ring 103" and the "upper pressing member 70". Combined with the limiting member 60 that limits the outer periphery inward, a stable and immovable detection section 201 is formed above the cavity 50. Since the object being tested 110 and the sealing ring 103 are in surface contact and pressed together at this time, it can effectively prevent local lifting or leakage points from occurring during subsequent high-pressure water injection and constant pressure maintenance, thereby ensuring that the detection section 201 is truly in an upper sealed state.

[0036] During the stage of "continuously injecting water into the closed loop", the real water control box 40 sends water into the injection section 202. The water then enters the detection section 201 and continues to flow to the outlet section 203. At this time, the water continues to flow through the detection section 201 under the impetus of high-pressure gas. Since the detection section 201 is completely sealed from above by the test object 110, the flowing water will carry out the air bubbles and trace amounts of air that were originally left in the detection section 201, and discharge them back to the water tank 30 through the outlet section 203. This clears the detection area to a "liquid-dominated" state before entering the subsequent pressurized test.

[0037] When performing the action of "applying a preset air pressure to the water body and maintaining a constant pressure, and monitoring the change in air pressure during the holding phase", the second switch 4012 between the water outlet section 203 and the water inlet 302 of the water tank 30 can be closed, so that the water flowing into the detection section 201 no longer flows back, but is in a pressurized holding phase driven by high-pressure gas. At this time, the pressurized water body pushes upward against the lower surface of the test object 110. If the waterproof structure of the test object 110 is intact, the water body cannot leak out through the test object 110, the water volume in the detection section 201 remains unchanged, and the space of the high-pressure gas connected to it also does not change. Therefore, the air pressure detected by the air tightness detector 80 remains constant. Conversely, if the test object 110 has leakage, the water body will be discharged upward through the test object 110, resulting in a decrease in the amount of water in the water injection section 202 and the detection section 201, while the gas space connected to it passively increases, and the total amount of gas remains unchanged, thereby causing the detection air pressure to drop. By comparing whether the air pressure remains stable or decreases during the holding phase, it can be determined whether the waterproof performance of the tested object 110 is qualified.

[0038] Furthermore, the section 202 through the protrusion 102 is designated as a first water injection part 2021. The first water injection part 2021 is arranged vertically in the Z direction, with its lower end connected to the water delivery passage on the side of the real water control box 40, and its upper end directly opening into the lower part of the detection section 201. Thus, when the stage of "continuously injecting water into the closed loop" is performed, the water pushed by the real water control box 40 can directly enter the detection section 201 from bottom to top and impact the lower surface of the test object 110 located above the open cavity 50. Since the water flows upward against the test object 110, if there are defects or channels in the waterproof structure of the test object 110, water will seep out directly from the outer surface, gaps or acoustic holes of the test object 110 during the water injection stage. The operator can make a visual observation from the outside, thereby screening out obviously unqualified test objects 110 in advance before entering the real water constant pressure stage, thus improving the testing cycle and reducing subsequent misjudgments.

[0039] Correspondingly, the portion of the water outlet section 203 that penetrates the boss 102 is configured as a first water outlet 2031. The first water outlet 2031 is also arranged vertically in the Z direction. Its lower end is connected to the lower part of the detection section 201, and its upper end is connected to the real water control box 40 through the pipe inside the fixture 10, and finally to the water inlet 302 of the water tank 30. Since the first water outlet 2031 is vertically arranged, when the water replacement is completed and the stage of "applying a preset air pressure to the water body and maintaining constant pressure, and monitoring the change of air pressure during the holding stage" is entered, if there is still a very small amount of residual gas or tiny bubbles in the detection section 201, they will preferentially accumulate under the action of gravity and be discharged along the vertical first water outlet 2031, thereby avoiding the compression and re-expansion of these residual gases during the constant pressure holding period, which would interfere with the pressure stability in the detection section 201.

[0040] Correspondingly, at the end of the water injection section 202 furthest from the fixture 10 and closer to the real water control box 40, a second water injection section 2022 is configured. The second water injection section 2022 is arranged in the horizontal direction X and is used to directly connect with the water outlet of the real water control box 40 or the water output end of the generator 402. By making this end a horizontal interface, on the one hand, it is convenient for the real water control box 40 to be arranged as a whole on the side or below the fixture 10 without changing the vertical structure of the fixture 10; on the other hand, it is also convenient to arrange multiple switches 4011-4014, generator 402 and return pipe 403 inside the real water control box 40, so that the air and water circuits are distributed within the box and then connected to the fixture in a horizontal manner, reducing the bending and stress of the external hoses.

[0041] Correspondingly, the water outlet section 203 does not directly return to the water tank 30, but is indirectly connected to the water inlet 302 of the water tank 30 via the true water control box 40. In other words, whether the return water from the water outlet section 203 enters the water tank 30 is controlled by a switch located inside the true water control box 40. The phrase "the switch between the water outlet section and the water inlet of the water tank is integrated within the true water control box" refers to this. The advantage of this is that during the "continuous water replacement" phase, the switch can be opened to guide the return water and any entrained residual gas back to the water tank 30; while during the "constant pressure maintenance detection" phase, the switch can be closed, creating a closed system on the water outlet side, and the water in the detection section 201 is under pressure, facilitating accurate pressure monitoring by the airtightness detector 80.

[0042] To complement the aforementioned horizontal water inlet method, the portion of the water outlet section 203 connected to the true water control box 40 is designated as the second water outlet section 2032, which is also configured along the horizontal direction X. Thus, the vertical water channels on the fixture 10 (first water inlet section 2021, first water outlet section 2031) and the horizontal water channels on the external control box 40 (second water inlet section 2022, second water outlet section 2032) form a segmented structure of "vertical + horizontal": the interior of the fixture maintains a vertical channel to facilitate water inlet impact and air venting, while the exterior of the fixture uses a horizontal interface to facilitate assembly, pipe laying, and integrated installation of the control unit. Through this segmented arrangement, the opening and closing of the water channels, the return flow, and the coupling of the air channels can all be completed within the true water control box 40 without altering the existing clamping structure of the fixture 10.

[0043] Furthermore, the real water control box 40 is equipped with a combined unit for simultaneously processing water and air circuits. This unit includes at least two parts: a generator 402 and a return pipeline 403.

[0044] One end of the generator 402 is connected to the second water injection section 2022 on the side of the fixture 10, and is used to send the water, which has been pressurized or propelled by the generator 402, into the closed circuit 20; the other end of the generator 402 is connected to the water tank 30 and the air outlet 801 of the airtightness detector 80. On the one hand, the generator 402 can draw water from the water tank 30 and enter its interior through its connection with the water tank 30; on the other hand, the air outlet 801 of the airtightness detector 80 inputs high-pressure air into the generator 402. The high-pressure air and the drawn-in water are in the same air passage inside the generator 402. According to the principle that "the air pressure is equal everywhere in the same air passage", the airtightness detector 80 can directly monitor the air pressure change of the air passage inside itself, without having to set up a water-resistant and corrosion-resistant liquid pressure sensor on the water passage side. In other words, the airtightness tester 80 is both a high-pressure air source and a testing end, while the generator 402 plays the role of "pushing the water in the water tank to the closed circuit 20". The two work together to complete the pressure test after the medium switching in the same device.

[0045] To facilitate water recycling, the true water control box 40 is equipped with a return pipe 403. One end of the return pipe 403 is connected to the inlet 302 of the water tank 30, and the other end is connected to the second outlet 2032 of the outlet section 203. During the "continuous injection of water into the closed loop" stage, the water entering the detection section 201 from the injection section 202 and carrying away residual gas will return to the true water control box 40 via the outlet section 203 and the second outlet 2032. It will then be guided back to the inlet 302 of the water tank 30 through the return pipe 403, achieving unified recovery of both water and the carried-in gas. Both residual gas squeezed out by the water and tiny air bubbles discharged from the detection section 201 will enter the water tank 30 along with the return water, ensuring that the closed loop 20 is essentially free of residual gas before entering the "constant pressure maintenance detection" stage.

[0046] Furthermore, the true water control box 40 is also equipped with a switch assembly for controlling the water circuit opening and closing in stages. The switch assembly includes at least a first switch 4011 and a second switch 4012. The first switch 4011 is located between the water outlet side of the generator 402 and the second water injection section 2022 on the fixture 10 side, and is used to control whether the water pressurized by the generator 402 is sent into the closed circuit 20. The second switch 4012 is located between the return pipe 403 and the water inlet 302 of the water tank 30, and is used to control whether the return water discharged from the closed circuit 20 returns to the water tank 30.

[0047] During the stage of "continuously injecting water into the closed loop," the water needs to be kept flowing continuously to fully displace the residual gas in the water injection section 202 and the detection section 201. For this purpose, the first switch 4011 and the second switch 4012 can be simultaneously turned on: the water in the water tank 30, propelled by the generator 402 and high-pressure gas, enters the second water injection section 2022 through the first switch 4011, and then sequentially enters the detection section 201 through the first water injection section 2021; simultaneously, the water flowing out of the detection section 201, along with any air bubbles carried within it, returns to the real water control box 40 through the water outlet section 203, and, with the second switch 4012 open, returns to the water inlet 302 of the water tank 30 along the return pipe 403. This creates a closed loop of sequential water output, water injection, detection, and water return between the water injection section 202 and the detection section 201 in the water tank 30, the real water control box 40, and the fixture 10, ensuring that the replacement action is completed continuously and fully.

[0048] When entering the stage of "applying a preset air pressure to the water body and maintaining a constant pressure, and monitoring the change of air pressure during the holding phase," the water body in the detection section 201 needs to be in a pressurized rather than flowing state so that the airtightness detector 80 can accurately reflect whether the tested object 110 has leaked. For this purpose, the first switch 4011 can be kept in the open state, so that the generator 402 and the closed circuit 20 are still connected. The high-pressure gas output by the airtightness detector 80 can apply and maintain the preset air pressure to the water body in the detection section 201 through the generator 402. At the same time, the second switch 4012 is closed to cut off the return flow path from the water outlet section 203 to the water tank 30, so that the detection section 201 and the water injection section 202 at its front end become a pressurized closed water circuit. If the waterproof performance of the tested object 110 is qualified, the pressurized water will not leak out, and the detected air pressure will remain stable. If leakage occurs, water will be discharged through the tested object 110, the water volume in the water injection section 202 will decrease, and the gas space will increase. The air tightness tester 80 can then detect the drop in air pressure, thus determining the waterproof performance. By using different opening and closing combinations of the two switches between the replacement and holding phases, dynamic switching of the water circuit can be completed within the same real water control box 40 without the need for additional exposed valves around the fixture, facilitating the integrated layout of the equipment and subsequent maintenance.

[0049] Furthermore, the true water control box 40 is also equipped with a third switch 4013 and a fourth switch 4014 for controlling the on / off state of the gas source, so as to finely switch the water source path and the gas source path at different detection stages. Specifically, the third switch 4013 is located between the generator 402 and the water tank 30, and is used to control whether water in the water tank 30 is drawn into the generator 402; the fourth switch 4014 is located between the generator 402 and the air outlet 801 of the airtightness detector 80, and is used to control whether the high-pressure gas output by the airtightness detector 80 enters the generator 402 and forms a connected air path with the water path.

[0050] During the stage of "continuously injecting water into the closed circuit," the water tank 30 needs to continuously supply water, and high-pressure gas is needed to push the water so that it can continuously enter the water injection section 202 and replace the detection section 201. For this purpose, the third switch 4013 and the fourth switch 4014 can be simultaneously turned on. Water from the water tank 30 is drawn into the generator 402 via the third switch 4013, and high-pressure gas enters the generator 402 via the fourth switch 4014. Both work together in the generator 402 to push the water to the second water injection section 2022 and finally into the detection section 201. Meanwhile, in order to ensure that the water discharged from the detection section 201 can return to the water tank 30, the first switch 4011 and the second switch 4012 are also kept open, so that the discharged water enters the real water control box 40 through the outlet section 203 and returns to the inlet end 302 of the water tank 30 through the return pipe 403. Thus, a closed loop of sequential water discharge, water injection, detection, water discharge and water return is formed between the water tank 30, generator 402, water injection section 202, detection section 201, water outlet section 203 and return pipe 403, ensuring that the replacement process continues to proceed stably.

[0051] During the stage of "applying a preset air pressure to the water body and maintaining a constant pressure, and monitoring the changes in air pressure during the holding phase," the water body in the detection section 201 is required to be in a pressurized but no longer flowing back, while high-pressure gas must still be kept in contact with the water body so that the airtightness detector 80 can monitor pressure changes in real time. Therefore, in this stage, the fourth switch 4014 can be kept in the open state, so that the air outlet 801 of the airtightness detector 80 continues to provide stable high-pressure gas to the generator 402 and even the entire closed circuit 20; at the same time, the third switch 4013 is placed in the closed state, cutting off the connection between the generator 402 and the water tank 30, preventing the water body from being drawn back into the water tank 30 during the pressurization process, so that the water body in the detection section 201 is truly in the holding phase where it is held up by high-pressure gas. In conjunction with the water circuit state of "first switch 4011 open, second switch 4012 closed" in the previous embodiment, a pressurized circuit can be formed inside the real water control box 40 that is only connected to the air tightness detector 80 and the downstream water circuit is closed, so as to determine whether the object under test 110 is leaking water based on whether the air pressure drops.

[0052] During the initial ventilation test phase, which involves "injecting high-pressure gas into the sealed circuit and monitoring the pressure change after a preset time," to ensure the high-pressure gas can directly enter the sealed circuit 20 without being diverted by the water path, the first switch 4011 can be placed in the open position, allowing the gas to smoothly pass through the generator 402 and enter the water injection section 202; the second switch 4012 can be placed in the closed position to prevent the gas from entering the water tank 30 via the return pipe 403; simultaneously, the third switch 4013 can be placed in the closed position to prevent high-pressure gas from flowing back into the water tank 30; and the fourth switch 4014 can be kept in the open position to maintain direct communication between the air tightness tester 80 and the sealed circuit 20. Through this combination of switch states, the high-pressure gas can enter the fixture 10 in the form of a single gas path within the real water control box 40 and fill the sealed circuit 20. The air tightness tester 80 can then monitor the pressure change after a preset time to complete the test of the air permeability performance of the tested object 110.

[0053] Furthermore, the real water testing device 100 of this application may include a fixture 10, a real water control box 40 connected to the fixture 10, and a water tank 30 and an airtightness tester 80 connected to the real water control box 40, connected in sequence. The fixture 10 is used to hold the test object 110, and after the test object 110 is pressed against the sealing ring 103 of the fixture 10, it together with the water injection section 202, the detection section 201 and the water outlet section 203 below the fixture 10 to form a closed loop 20. In this way, subsequent gas detection, water replacement and constant pressure real water detection can all be completed within the same closed loop 20 without changing the testing fixture or transferring the test object 110.

[0054] During use, the operator places the test object 110 on the sealing ring 103 above the fixture 10, ensuring that the test object 110 completely covers the open cavity 50 formed by the boss 102 and the sealing ring 103. The test object 110 can be pressed vertically Z by the limiting member 60 and the pressing member 70 to ensure a seal at the top. Subsequently, the air passage between the real water control box 40 and the air tightness tester 80 is connected. The real water control box 40 fills the closed circuit 20 with high-pressure gas. After a preset set time, the air tightness tester 80 monitors the air pressure change in the closed circuit 20. When the air pressure drops to the ambient pressure range within the time window, the air permeability of the test object 110 is considered qualified. If the air pressure remains at a high level, the air permeability is considered unqualified, and the test object will not proceed to the subsequent real water testing process.

[0055] After completing the gas detection, the real water control box 40 switches to water circuit operation mode, drawing water from the water tank 30. After being pressurized by the generator 402 inside, the water is sent to the second water injection section 2022 on the side of the fixture 10. The water then flows from bottom to top through the first water injection section 2021 into the detection section 201, creating a continuous and stable flow within the closed loop 20. The water sequentially passes through the water injection section 202, the detection section 201, and the outlet section 203 before returning to the real water control box 40 and then back to the water tank 30 via the return pipe 403. During this process, residual gas previously trapped in the closed loop 20 is carried back to the water tank 30, thus actively emptying the detection section 201. After confirming that the residual gas has been replaced, the real water control box 40 is connected to the air outlet 801 of the air tightness tester 80, and high-pressure gas is obtained from the air tightness tester 80 to apply a preset air pressure to the water in the closed circuit 20 and maintain a constant pressure. During this holding phase, the air tightness tester 80 continuously monitors the air pressure changes in the connected air path: when the air pressure remains stable, it can be considered that the water in the detection section 201 has not penetrated the test object 110, and the waterproof performance of the test object 110 is qualified; when the air pressure drops, it indicates that the water has penetrated the test object 110 and seeped outward under pressure, resulting in a reduction in the amount of water in the circuit and an increase in the space occupied by the gas. Based on this, it can be determined that the test object 110 has a water leakage defect.

[0056] By designing a closed loop 20, air permeability testing and water permeability testing are sequentially linked at the same station, avoiding the hassle of equipment replacement required in traditional methods. During the gas testing phase, high-pressure gas is injected into the closed loop 20 via the air tightness tester 80 and the water permeability control box 40 to accurately determine the air permeability of the tested object. After the gas testing is completed, water is continuously injected into the water injection section 202 by the water control box 40, causing the water to flow sequentially through the testing section 201 and exit from the outlet section 203 to displace residual gas. A preset air pressure is applied to the water entering the testing section 201 and maintained at a constant pressure to ensure accurate determination of waterproof performance during the constant pressure phase. This method improves the accuracy, reliability, and efficiency of the test, reduces the false judgment rate, and simplifies the structure of the water permeability testing device 100.

[0057] The embodiments described above are merely examples of several implementations of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A method for detecting true water in an acoustic waterproof element, characterized in that, The method includes the following steps: Place the object to be tested on the fixture, so that it forms a closed circuit with the area below the fixture; High-pressure gas is introduced into the closed circuit, and the gas pressure is monitored after a preset time. The air permeability is deemed qualified when the gas pressure returns to normal pressure; otherwise, it is deemed unqualified. After the gas detection is completed, water is continuously injected into the closed circuit so that the water can fully replace the residual gas in the closed circuit during the flow process. After the residual gas is removed, a preset air pressure is applied to the water body and kept constant. The change of air pressure during the holding phase is monitored. When the air pressure drops, it is determined that the tested object is leaking water. When it remains stable, it is determined that the waterproof performance is qualified.

2. The method for detecting true water in acoustic waterproof components according to claim 1, characterized in that, One end of the closed circuit is connected to the outlet of the water tank, and the other end is connected to the inlet of the water tank. A true water control box is provided between the closed circuit and the water outlet of the water tank. When "water is continuously injected into the closed loop", the water in the water tank first flows into the real water control box. High-pressure gas is injected into the real water control box to push the water to continuously enter the closed loop. The water flows along the closed loop past the bottom of the test object and back to the water inlet of the water tank. During the flow, it displaces the residual gas in the closed loop and carries the residual gas back to the water tank.

3. The method for detecting true water in acoustic waterproof components according to claim 2, characterized in that, The closed circuit includes: The detection section is located below the object being tested; The water injection section is located between the detection section and the real water control box; The water outlet section is located between the detection section and the water inlet end of the water tank; The top surface of the fixture is recessed downward to form an annular groove and a boss surrounded by the annular groove. A sealing ring is provided in the annular groove, and the sealing ring is higher than the top surface of the boss, so as to form an open cavity between the sealing ring and the top surface of the boss. The object to be tested is placed on the top surface of the sealing ring and completely covers the open cavity to form the detection section; The water injection section and the water outlet section are integrally formed in the fixture and respectively penetrate the top surface of the boss and communicate with the detection section; During the continuous injection of water into the closed circuit, the water enters the detection section through the injection section and then enters the outlet section. When “applying a preset air pressure to the water body and maintaining a constant pressure, and monitoring the change of air pressure during the holding phase”, the water body should at least fully replace the residual gas in the water injection section and the detection section during the flow process.

4. The method for detecting true water in acoustic waterproof components according to claim 3, characterized in that, When viewed vertically, the outer contour shape and size of the sealing ring are adapted to the outer contour shape and size of the object being measured. A limiting member is provided around the outer periphery of the sealing ring, and a pressing member is provided directly above the boss. When the object to be tested is placed on the top surface of the sealing ring, the limiting member limits the object to be tested inward around the outer periphery, and the pressing member abuts against the object to be tested from top to bottom, so that the object to be tested and the sealing ring are fully pressed together to form a sealed detection section above the cavity. When "water is continuously injected into the closed circuit", the water, driven by high-pressure gas, passes through the detection section and carries away the residual gas in the detection section during the continuous flow through the detection section. When “a preset air pressure is applied to the water body and kept constant, and the change of air pressure is monitored during the holding phase”, the switch between the water outlet section and the water inlet of the water tank is closed, and the water body pushed by high-pressure gas is in the pressurized holding phase. During the holding phase, pressurized water rises to contact the object being tested. When the waterproof performance of the object is qualified, the water is held within the testing section, and the pressure of the water and the pressure of the high-pressure gas remain constant. When the waterproof performance of the object is unqualified, the water is discharged upward through the object, the water volume in the injection section decreases, the space filled by the high-pressure gas increases, but the total amount of gas remains unchanged, and the gas pressure decreases. Thus, by judging whether the gas pressure decreases or remains constant, the waterproof performance of the object is determined.

5. The method for detecting true water in an acoustic waterproof element according to claim 4, characterized in that, The portion of the water injection section that penetrates the protrusion is referred to as the first water injection section, and the first water injection section is arranged in the vertical direction; When "water is continuously injected into the closed circuit", the water flows into the detection section from bottom to top and impacts the test object located above the cavity. If the waterproof performance of the test object is unqualified, the water will pass through the test object during the water injection stage. By observing whether water seeps out during the water injection stage, it can be determined whether the waterproof performance of the test object is qualified. The portion of the water outlet section that penetrates the protrusion is referred to as the first water outlet section, and the first water outlet section is arranged in the vertical direction; When "applying a preset air pressure to the water body and maintaining a constant pressure, and monitoring the change of air pressure during the holding phase", gravity is used to avoid residual gas in the water outlet section from interfering with the detection in the detection section.

6. The method for detecting true water in an acoustic waterproof element according to claim 5, characterized in that, The portion of the water injection section connected to the real water control box is referred to as the second water injection section, which is arranged in a horizontal direction. The water outlet section is indirectly connected to the water inlet of the water tank through the real water control box, and the switch between the water outlet section and the water inlet of the water tank is integrated into the real water control box. The portion of the water outlet section connected to the real water control box is referred to as the second water outlet section, which is configured in a horizontal direction.

7. The method for detecting true water in an acoustic waterproof element according to claim 6, characterized in that, The true water control box includes: The generator has one end connected to the second water injection section and the other end connected to the water tank and the air outlet of the air tightness detector. The water in the water tank is drawn into the generator, and the air outlet of the air tightness detector outputs high-pressure air. The air pressure in the air tightness detector is detected by the principle that the air pressure is equal everywhere in the same connected air path. The return pipe is connected at one end to the inlet of the water tank and at the other end to the second outlet of the outlet section.

8. The method for detecting true water in an acoustic waterproof element according to claim 7, characterized in that, The true water control box also includes: A first switch is located between the generator and the second water injection section; The second switch is located between the return pipe and the water inlet of the water tank; When "water is continuously injected into the closed circuit", both the first switch and the second switch are in the open state; When “a preset air pressure is applied to the water body and kept constant, and the change of air pressure is monitored during the holding phase”, the first switch is in the open state and the second switch is in the closed state.

9. The method for detecting true water in an acoustic waterproof element according to claim 8, characterized in that, The true water control box also includes: The third switch is located between the generator and the water tank; The fourth switch is located between the generator and the air outlet of the air tightness detector; When "water is continuously injected into the closed circuit", the third switch and the fourth switch are in the open state; When “a preset air pressure is applied to the water body and kept constant, and the change of air pressure during the holding phase is monitored”, the third switch is in the closed state and the fourth switch is in the open state. When "high-pressure gas is introduced into the closed circuit and the pressure change is monitored after a preset time", the first switch is in the open state, the second switch is in the closed state, the third switch is in the closed state, and the fourth switch is in the open state.

10. A true water detection device for an acoustic waterproof element, characterized in that, For implementing the method as described in any one of claims 1-9, the real water detection device comprises: a fixture, a real water control box connected to the fixture, and a water tank and an airtightness detector connected to the real water control box. The object to be tested is placed on the fixture, and the object to be tested and the area below the fixture form a closed circuit; The real water control box fills the closed circuit with high-pressure gas. After standing for a preset time, the air tightness tester monitors the change in air pressure. When the air pressure returns to normal pressure, the air permeability is deemed qualified; otherwise, it is deemed unqualified. After the gas detection is completed, the real water control box draws water from the water tank and continuously injects water into the closed loop, so that the water can fully replace the residual gas in the closed loop during the flow process. After the residual gas is removed, the real water control box extracts high-pressure gas from the airtightness detector to apply a preset air pressure to the water body and maintain a constant pressure. The change of air pressure during the holding phase is monitored. When the air pressure drops, it is determined that the tested object is leaking water. When it remains stable, it is determined that the waterproof performance is qualified.

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