A waterproof test system, control method and smart watch for a miniature high-sealing watch

Abstract

The application provides a waterproof test system and control method for a micro high-sealing watch and a smart watch, and relates to the technical field of air tightness detection of electronic equipment. The method comprises the following steps: a communication connection is established between a wireless communication device and a micro high-sealing watch to be tested; a target test air pressure is applied to a test chamber containing the watch by controlling a pressure regulating device; in the pressure stabilizing stage after the air pressure is applied, a physical obstacle removal instruction is sent to the watch to be tested by the communication device, the watch to be tested is controlled to call a built-in vibration device to perform a sweep frequency oscillation action, and then the action is used to destroy the micro liquid film blocking state existing on the surface; air pressure decay data fed back by a pressure sensing device is acquired in the pressure stabilizing stage, and the waterproof performance of the watch is determined based on the air pressure decay data. The application can effectively destroy the false blocking phenomenon caused by the liquid film at the assembly gap, and improves the accuracy of the air tightness test result of the equipment.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing technology for electronic devices, and particularly to a waterproof testing system, control method, and smartwatch for a miniature high-sealing watch. Background Technology

[0002] Currently, micro-sized high-sealing watches under test typically undergo an airtightness test before leaving the factory. The conventional airtightness test involves applying static high-pressure gas to a sealed chamber containing the device under test, and monitoring the pressure drop inside the sealed chamber using an external pressure sensor to assess the presence of leaks. This detection mechanism is well-suited for detecting conventional macroscopic leaks.

[0003] During the assembly and manufacturing process of the miniature high-sealing watch under test, condensate or lubricating grease can easily adhere to the seams of the casing and sensor openings. When subjected to external static high-pressure gas, the trace amounts of liquid in the assembly gaps are constrained by surface tension and capillary resistance of the micropores, and will accumulate inside the gap channels to form a microscopic liquid film. Under the action of the internal and external pressure difference, the microscopic liquid film undergoes forced physical deformation and adheres tightly to the sidewall of the gap, forming a pseudo-blocking state at the physical level.

[0004] A microscopic liquid film in a pseudo-blocking state obstructs the leakage path of the test gas, preventing external pressure sensors from collecting pressure attenuation data that reflects the true leakage situation. This can lead to incorrect conclusions from the system's judgment logic. When a watch with such assembly gaps is placed in a real water-wet environment, the internal mechanical balance of the microscopic liquid film is disrupted by changes in external water pressure, allowing moisture to still penetrate the device and cause electronic malfunctions. Therefore, appropriate technical measures are needed to eliminate the physical pseudo-blocking effect of the microscopic liquid film and obtain objective and accurate test data. Summary of the Invention

[0005] The purpose of this invention is to provide a waterproof testing system, control method, and smartwatch for a miniature high-sealing watch, in order to solve the problems mentioned in the background art.

[0006] In a first aspect, the present invention provides a waterproof testing system for a miniature high-sealing watch, including a test chamber, a pressure regulating device communicating with the test chamber, and a pressure sensing device disposed in the test chamber for monitoring air pressure values, wherein the test chamber is used to accommodate the miniature high-sealing watch to be tested; The waterproof testing system also includes a main control device and a wireless communication device connected to the main control device; The main control device is used to establish a communication connection with the micro high-sealing watch under test through the wireless communication device; The main control device is also used to control the pressure regulating device to apply the target test gas pressure to the test chamber; The main control device is also used to send a physical clearance command to the micro high-sealing watch under test through the wireless communication device during the pressure stabilization stage after the target test air pressure is applied, so as to control the micro high-sealing watch under test to call the built-in vibration device to perform a frequency sweep oscillation action, thereby using the frequency sweep oscillation action to destroy the micro liquid film sealing state on the surface of the micro high-sealing watch under test. The main control device is also used to acquire the air pressure attenuation data fed back by the pressure sensing device during the pressure stabilization phase, and determine the waterproof performance of the micro high-sealing watch under test based on the air pressure attenuation data.

[0007] Optionally, the pressure regulating device includes a servo pressurizing pump and an exhaust pressure relief valve connected in series with the servo pressurizing pump, and the main control device is electrically connected to the servo pressurizing pump and the exhaust pressure relief valve respectively.

[0008] Optionally, the test chamber is provided with a volume filling block, which occupies the empty space inside the test chamber to reduce the gas volume inside the test chamber.

[0009] Optionally, the waterproof testing system further includes a temperature sensor disposed inside the testing chamber, and the main control device is also used to acquire temperature drift data fed back by the temperature sensor, and to use the temperature drift data to perform thermodynamic reference compensation on the air pressure attenuation data.

[0010] Optionally, the physical obstacle removal command carries an initial vibration frequency parameter and an ending vibration frequency parameter; the frequency sweep oscillation action is characterized by the vibration frequency continuously increasing from the initial vibration frequency parameter to the ending vibration frequency parameter, so as to cover the inherent resonant frequency corresponding to the microscopic liquid film blocking state.

[0011] Optionally, when determining the waterproof performance of the micro high-sealing watch under test based on the air pressure attenuation data, the main control device is specifically used for: Calculate the real-time pressure drop slope corresponding to the pressure decay data; The time axis of the real-time voltage reduction slope is timestamped and compared with the execution time window corresponding to the frequency sweep oscillation action.

[0012] Optionally, when the main control device performs timestamp alignment and comparison between the time axis of the real-time buck slope and the execution time window corresponding to the frequency sweep oscillation action, it specifically uses the following methods: Determine whether the real-time pressure reduction slope exhibits abrupt jump characteristics within the execution time window; If the real-time pressure drop slope exhibits the abrupt jump characteristic, and the pressure drop slope after the abrupt jump exceeds the preset leakage threshold, then it is determined that the microscopic liquid film sealing state has been successfully destroyed and the waterproof performance of the micro high-sealing watch under test is unqualified.

[0013] Optionally, the main control device is also used for: After determining that the waterproof performance of the micro high-sealing watch under test is unqualified, a stop oscillation command is sent to the micro high-sealing watch under test through the wireless communication device, and the pressure regulating device is controlled to release the gas inside the test chamber according to the preset pressure reduction rate.

[0014] Secondly, the present invention provides a control method for a waterproof testing system of a miniature high-sealing watch, applied to the waterproof testing system of a miniature high-sealing watch as described in any one of the first aspects, the control method comprising: Establish a communication connection with the micro high-sealing watch under test via a wireless communication device; The pressure regulating device is used to apply the target test air pressure to the test chamber; During the pressure stabilization phase after applying the target test air pressure, a physical clearance command is sent to the micro high-sealing watch under test through the wireless communication device to control the micro high-sealing watch under test to call the built-in vibration device to perform a frequency sweep oscillation action, thereby using the frequency sweep oscillation action to destroy the micro liquid film sealing state on the surface of the micro high-sealing watch under test. During the pressure stabilization phase, the pressure decay data fed back by the pressure sensing device is acquired, and the waterproof performance of the micro high-sealing watch under test is determined based on the pressure decay data.

[0015] Thirdly, the present invention provides a smartwatch, which is the micro high-sealing watch under test in the waterproof testing system of the micro high-sealing watch described in any one of the first aspects. The smartwatch is internally configured with a control motherboard, a communication transceiver component connected to the control motherboard, and a built-in vibration device connected to the control motherboard. The communication transceiver component is used to receive physical obstacle clearing commands sent by the main control device; The control motherboard is used to parse the physical obstacle clearing command and drive the built-in vibration device to perform frequency sweep oscillation, so as to cooperate with the waterproof testing system of the miniature high-sealing watch to destroy the microscopic liquid film sealing state on the surface.

[0016] The present invention has achieved the following beneficial effects: By establishing a wireless communication connection with the watch under test during the pressure stabilization phase after applying test air pressure, and issuing physical clearance commands to control the watch under test to autonomously invoke its built-in vibration device to perform frequency sweep oscillation. The continuous frequency-converting mechanical wave output from the frequency sweep oscillation covers and matches the inherent resonant frequency of the microscopic liquid film at the assembly gap. Relying on the physical principle of acoustic resonance, this causes the microscopic liquid film to undergo forced deformation and breakage, thereby disrupting the physical sealing structure formed by the fluid constrained by factors such as surface tension. This working mechanism, based on the coordination between the test system's underlying commands and the internal hardware of the tested terminal, eliminates the masking effect of trace fluid on tiny leakage channels, allowing the previously falsely sealed assembly gaps to reopen to the external test chamber. After removing the liquid film's obstruction interference, the pressure sensing device can effectively collect real, objective air pressure attenuation data caused by the internal space connectivity, avoiding the leakage issues that easily occur in conventional static pressure holding tests, and improving the accuracy and reliability of waterproof testing for miniature high-sealing watches.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structural composition of the waterproof testing system for a miniature high-sealing watch in an embodiment of the present invention; Figure 2 This is a flowchart illustrating the steps of the waterproof testing system control method in an embodiment of the present invention. Figure 3 This is a block diagram of the internal hardware structure of the smartwatch in an embodiment of the present invention. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] The miniature high-sealing watch under test undergoes an airtightness test before leaving the factory. The conventional airtightness test involves applying static high-pressure gas to a sealed chamber containing the device under test and assessing the presence of leaks by monitoring the pressure drop within the chamber. During the assembly process of the miniature high-sealing watch, condensate or lubricating grease adheres to assembly gaps such as the seams of the casing and sensor openings. When subjected to external static high-pressure gas, the trace amounts of liquid in these gaps are constrained by surface tension and capillary resistance, forming a microscopic liquid film within the gap channel. Under the influence of the internal and external pressure difference, this microscopic liquid film undergoes forced physical deformation and adheres tightly to the gap sidewalls, creating a pseudo-blockage at the physical level. This pseudo-blockage of the microscopic liquid film blocks the leakage path of the test gas, preventing external pressure sensors from collecting pressure drop data and causing the system's judgment logic to output incorrect conclusions. When a miniature high-sealing watch under test is placed in a real water-wet environment, the mechanical balance inside the microscopic liquid film is disrupted by changes in external environmental pressure, allowing moisture to penetrate the device through gaps and cause functional failure. This invention provides a waterproof testing system and control method for miniature high-sealing watches. Through system-level control commands and physical coordination with the hardware of the device under test, mechanical vibrations are used to disrupt the physical structure of the liquid film, eliminating the false sealing state.

[0022] This application discloses a waterproof testing system for a miniature, highly sealed watch, referring to... Figure 1 As shown, the system includes a test chamber, a pressure regulating device connected to the test chamber, and a pressure sensing device disposed inside the test chamber for monitoring air pressure values. The test chamber is used to house a miniature high-sealing watch under test. The waterproof testing system also includes a main control device and a wireless communication device connected to the main control device. The main control device is used to establish a communication connection with the miniature high-sealing watch under test through the wireless communication device. The main control device is also used to control the pressure regulating device to apply a target test air pressure to the test chamber. During the pressure stabilization phase after applying the target test air pressure, the main control device is also used to send a physical clearance command to the miniature high-sealing watch under test through the wireless communication device to control the miniature high-sealing watch under test to call its built-in vibration device to perform a frequency sweep oscillation action, thereby using the frequency sweep oscillation action to destroy the microscopic liquid film sealing state on the surface of the miniature high-sealing watch under test. During the pressure stabilization phase, the main control device is also used to acquire the air pressure attenuation data fed back by the pressure sensing device and determine the waterproof performance of the miniature high-sealing watch under test based on the air pressure attenuation data.

[0023] Specifically, the test chamber is made of a hard metal material with compressive strength, forming a closed cavity structure inside. The main control device establishes data communication and electrical signal connections with the pressure regulating device, the pressure sensing device, and the wireless communication device. The main control device is equipped with a processor and a timing control memory storing the control logic of the waterproof test system. The wireless communication device is equipped with a radio frequency antenna and a baseband signal processing integrated circuit, supporting short-range wireless data transmission protocols. To overcome the Faraday cage shielding effect of the hard metal test chamber on radio frequency electromagnetic waves, the radio frequency antenna of the wireless communication device is built into the internal cavity sidewall of the test chamber in a split structure; the feed line of the radio frequency antenna penetrates the physical chamber wall through a high-voltage insulated radio frequency feed terminal embedded in the metal wall of the test chamber, establishing a low-loss electrical connection with the baseband signal processing integrated circuit located outside, thereby ensuring the stability of the communication link with the micro high-sealing watch under test in a closed metal high-voltage environment. The micro high-sealing watch under test is placed on a pre-set support platform inside the test chamber, and the test chamber door is closed. To prevent the high-frequency mechanical wave energy of the micro high-sealing watch under test from acoustically coupling and dissipating to the external support environment during frequency sweep oscillation, the support platform is made of a hard ceramic material with high acoustic impedance or a surface-hardened alloy base, and its surface in contact with the back case of the micro high-sealing watch under test is provided with an array of point-like rigid support protrusions. These array-like point-like rigid support protrusions physically reduce the contact area between the terminal and the external environment, causing the mechanical flutter energy generated by the built-in vibrating device to be forcibly reflected by the high acoustic impedance of the support platform interface. This reflects and concentrates the oscillation wave at the assembly gaps of the watch itself, ensuring that the frequency sweep resonance physical action has sufficient transient mechanical kinetic energy to tear the microscopic liquid film. Subsequently, mechanical pressure is applied to the door through an external locking mechanism to maintain the overall airtightness of the internal structure of the test chamber.

[0024] The master control device sends a communication initialization control word to the wireless communication device via a signal transmission bus. Upon receiving the communication initialization control word, the wireless communication device sends a radio frequency pairing request message to the internal space of the test chamber via the radio frequency antenna. The micro high-sealing watch under test is in test receive mode, and its internal communication transceiver component receives the radio frequency pairing request message. After verifying the protocol identifier match, the internal communication transceiver component returns a connection confirmation message to the wireless communication device, thereby establishing a bidirectional transparent data transmission channel between the master control device and the micro high-sealing watch under test.

[0025] Understandably, in conventional barometric pressure testing equipment, the testing machine can only apply parameters and monitor the status of the device under test from the external physical environment. In this embodiment, a data link is established by configuring a wireless communication device. The main control device overcomes the physical barrier of the metal wall of the testing chamber to perform timing scheduling on the internal hardware of the miniature high-sealing watch under test. The establishment of the data link transforms the passively tested terminal into a collaborative control node within the testing system, providing the underlying physical architecture support for subsequent physical actions of the internal hardware to disrupt the external liquid film sealing.

[0026] In addition, the main control device controls the pressure regulating device to apply a target test air pressure to the test chamber. The target test air pressure is an equivalent gas pressure value calculated using a hydrostatic pressure formula based on the waterproof depth parameters of the micro high-sealing watch under test. The main control device outputs a pressure control level signal to the pressure regulating device via a digital-to-analog conversion circuit. Responding to the pressure control level signal, the pressure regulating device activates pneumatic components to force ambient air, after physical filtration and dehumidification, into the test chamber through a high-pressure air pipeline. During the dynamic process of gas injection, the pressure sensing device collects real-time air pressure values ​​inside the test chamber at a preset continuous sampling frequency and converts the analog air pressure signal into a digital air pressure signal, feeding it back to the main control device. The main control device performs an algebraic subtraction operation between the real-time air pressure value and the target test air pressure to obtain the real-time pressure deviation. Based on the real-time pressure deviation, the main control device dynamically adjusts the output amplitude of the pressure control level signal, controlling the pressure regulating device to reduce its inflation rate. When the real-time air pressure value reaches the target test air pressure value and remains stable within the preset tolerance range for a preset time, the main control device controls the pressure regulating device to stop the air output and cuts off the mechanical valve of the air intake circuit, controlling the internal environment of the test chamber to enter the pressure stabilization stage.

[0027] The pressure stabilization phase is a transitional period reserved after the external pressurization operation stops, allowing the gas flow field inside the test chamber to tend towards static stability and the gas thermodynamic parameters to tend towards thermal equilibrium. During the pressurization process, external gas is forcibly compressed and injected into the sealed space, resulting in dynamic turbulence and eddies within the spatial flow field. Simultaneously, the forced compression of the gas leads to an increase in internal energy and temperature, resulting in dynamic pressure and temperature gradients within the test chamber. The purpose of the pressure stabilization phase is to eliminate the interference of fluid dynamics and thermodynamic fluctuations on the subsequent static leakage pressure detection background data by relying on natural physical diffusion and thermal conduction within the metal cavity. Through closed-loop pressure control logic and the pressure stabilization phase settings, the test system constructs an equivalent hydrostatic environment within the test chamber and provides a stable physical pressure baseline for collecting pressure decay data caused by leakage.

[0028] During the pressure stabilization phase after applying the target test pressure, the main control device sends a physical clearance command to the micro high-sealing watch under test via the wireless communication device. The physical clearance command is a data frame containing specific timing configuration parameters, encapsulated by the main control device according to a preset control protocol. After parsing the physical clearance command, the microcontroller unit inside the micro high-sealing watch under test outputs a corresponding timing-driven alternating current to its built-in vibration device. In response to the driving alternating current, the built-in vibration device initiates a frequency sweep oscillation action by its internal mechanical mass block. The mechanical oscillation wave generated by the built-in vibration device is conducted through the alloy frame and other supporting structural components of the micro high-sealing watch under test to the outer shell surface and assembly gaps where potential leaks may exist.

[0029] Specifically, the microscopic liquid film within the assembly gap is bidirectionally constrained by the surface tension of the liquid and the adhesion force of the microporous tube wall, forming a micro-damped vibration system with corresponding physical mass and elastic coefficient. Due to manufacturing variables such as the processing tolerance of the microscopic gap and the size of the assembly gap, as well as differences in the chemical composition, viscosity, and mass of the adhering liquid, the inherent resonant frequencies of each microscopic liquid film system are distributed within a specific broadband band. If a vibration control signal with a fixed frequency is output to the micro-high-sealing watch under test during the test, when the mechanical wave of a specific frequency deviates from the inherent resonant frequency point of the current microscopic liquid film system, acoustic dissipation of mechanical wave energy will occur during material transmission. Therefore, the frequency sweep oscillation action issued by the main control device manifests as a mechanical wave signal whose output vibration frequency continuously increases or decreases with the time axis.

[0030] It is understandable that during the continuous time period of the built-in vibrating device performing frequency sweep oscillation, the output transient mechanical wave frequency band covers the inherent resonant frequency distribution range corresponding to the microscopic liquid film sealing state. When the transient vibration frequency of the built-in vibrating device sweeps past the inherent resonant frequency point of the microscopic liquid film at the assembly gap, the microscopic liquid film damping system and the externally applied mechanical wave undergo acoustic resonance. In the resonant state, the mechanical wave carries kinetic energy and couples and transfers into the interior of the microscopic liquid film, and the vibration amplitude of the microscopic liquid film exhibits nonlinear amplification. When the dynamic forced deformation of the microscopic liquid film exceeds the surface tension structure limit maintained by the van der Waals forces between liquid molecules, the physical boundary of the microscopic liquid film undergoes irreversible fracture. The fluid molecules attached to the gap channel are broken by oscillation and disperse into the surrounding space. After the microscopic liquid film sealing state is destroyed by mechanical oscillation, the blocked assembly gap channel is opened to the interior of the test chamber. By utilizing the underlying system design of the hardware inside the device under test, the broadband physical energy is directly focused on the assembly gap of the casing, avoiding the acoustic impedance attenuation when the mechanical wave penetrates the thick metal wall of the test chamber.

[0031] Furthermore, during the pressure stabilization phase, the main control device acquires the pressure attenuation data fed back by the pressure sensing device and determines the waterproof performance of the micro high-sealing watch under test based on the pressure attenuation data. After the microscopic liquid film is physically broken by the sweep frequency oscillation, if the micro high-sealing watch under test has assembly defects or physical structural cracks, the high-pressure gas inside the test chamber, under the driving force of the internal and external pressure gradient, will transfer fluid to the low-pressure internal cavity of the micro high-sealing watch under test through the macroscopic leakage channel. According to the gas state evolution law of a closed volume system, the transfer of fluid molecules into the cavity of the device under test directly leads to a decrease in the total gas pressure value inside the test chamber.

[0032] Specifically, the main control device has a time-series data buffer block in its internal memory. The pressure sensing device writes discrete digital air pressure signals into the time-series data buffer block according to a set physical sampling period, forming air pressure decay data with time-series information. The main control device extracts the air pressure decay data in the time-series data buffer block and calls the microprocessor to calculate the air pressure decay amplitude. The main control device compares the calculated air pressure decay amplitude with a pre-stored allowable leakage judgment threshold. If the air pressure decay amplitude is greater than the allowable leakage judgment threshold, the main control device determines that the waterproof performance of the micro high-sealing watch under test is unqualified; if the air pressure decay amplitude is less than or equal to the allowable leakage judgment threshold, the waterproof performance is determined to be qualified, and the corresponding test record log is output.

[0033] According to the waterproof testing system for the miniature high-sealing watch, the pressure regulating device includes a servo pressurizing pump and an exhaust pressure relief valve connected in series with the servo pressurizing pump. The main control device is electrically connected to both the servo pressurizing pump and the exhaust pressure relief valve. The inlet of the servo pressurizing pump is connected to an external reference air source, and the outlet is connected to the inlet of the exhaust pressure relief valve via a rigid high-pressure sealed pipeline. The outlet of the exhaust pressure relief valve is connected to the gas distribution interface of the test chamber. The main control device is hardwired to the servo motor driver of the servo pressurizing pump and the pilot solenoid coil of the exhaust pressure relief valve via an industrial fieldbus.

[0034] In this embodiment, when the main control device controls the pressure regulating device to apply the target test air pressure, it sends a closing control level to the exhaust pressure relief valve, cutting off the airflow channel of the exhaust pressure relief valve and maintaining the pneumatic circuit in a unidirectional inflation state. Simultaneously, the main control device outputs a pulse width modulation digital control signal with a variable duty cycle to the servo motor driver of the servo pressurizing pump. The internal rotating mechanism of the servo pressurizing pump operates under electromagnetic torque drive, drawing in, compressing, and pumping the external low-pressure gas into the test chamber. The main control device acquires the current air pressure value and performs mathematical calculations using its internally integrated proportional-integral-derivative (PID) control algorithm module. The algorithm module calculates the proportional amplification term of the current pressure deviation, the integral accumulation term of the deviation over time, and the differential damping term of the rate of change of the deviation. Then, the proportional amplification term, the integral accumulation term, and the differential damping term are linearly summed to obtain the composite error adjustment amount. The main control device updates the duty cycle parameter of the pulse width modulation digital control signal in real time based on the composite error adjustment amount. As the duty cycle parameter changes, the effective voltage of the servo motor driver output to the stator coil of the servo booster pump changes accordingly, dynamically adjusting the rotor output torque and speed to achieve precise closed-loop regulation of the output flow rate of the servo booster pump.

[0035] Specifically, during the initial pressure application phase, the internal pressure deviation within the chamber is large. The main control device outputs a set duty cycle signal, and the servo pressurizing pump operates within its rated speed range to ensure the pressure build-up speed of the pressure system. As the real-time monitored pressure value approaches the preset tolerance threshold of the target test pressure, the pressure deviation gradually decreases. The main control device outputs a duty cycle signal with a decreasing trend, and the servo pressurizing pump's speed decreases smoothly under control, achieving pressure slope attenuation damping. When the real-time monitored pressure value enters the target test pressure tolerance zone and stabilizes, the main control device cuts off the pulse width modulation digital control signal output, and the servo pressurizing pump stops rotating. Upon the end of the test cycle or receipt of an abnormal termination command, the main control device outputs an opening control level to the pilot solenoid coil of the exhaust pressure relief valve. The pilot valve core inside the exhaust pressure relief valve moves against the mechanical spring preload, opening the main exhaust channel and releasing the high-pressure gas inside the test chamber to the external normal pressure environment.

[0036] Understandably, if a constant-speed air pump is used for pressurization, cutting off the air supply the instant the chamber pressure reaches the target value will cause pressure overshoot and oscillation within the test chamber due to the accumulated fluid inertia. This overshoot stress risks exceeding the withstand limit of the screen cover of the device under test, and the pressure oscillation leads to instability of the initial pressure reference point during the stabilization phase, increasing the difficulty of extracting smooth attenuation data. By configuring interconnected and separately controlled servo pressurization pumps and exhaust relief valves, along with proportional-integral-derivative closed-loop algorithm software, the system achieves precise control over the slope of the test pressure rise curve, suppressing pressure overshoot and pulsation interference within the pneumatic loop, and providing physical boundary conditions for the subsequent determination of minute attenuation amplitudes by the main control equipment.

[0037] In addition, a volume-filling block is provided inside the test chamber to occupy the empty space inside the test chamber, thereby reducing the gas volume inside the test chamber. The volume-filling block is processed from an engineering polymer material with uniform density. The engineering polymer material has a low physical compressibility coefficient below the system pressure monitoring resolution threshold, and its external three-dimensional contour surface and the surface of the contoured cavity structure are both treated with a densified sealing coating. This structural feature eliminates the false background pressure attenuation caused by the elastic contraction of the filling material itself or the adsorption of gas by surface micropores under high pressure, improving the directivity of the data collected by the pressure sensing device. The external three-dimensional contour surface of the volume-filling block forms a fitted assembly structure with the surface of the metal sidewall inside the test chamber, and the internal central region has a contoured cavity structure for accommodating the miniature high-sealing watch under test.

[0038] Specifically, the volumetric filling block is fixed to the metal base of the test chamber by mechanical fasteners. When the micro high-sealing watch under test is placed inside the contoured cavity structure, a gap ring is maintained between the outer surface of the micro high-sealing watch under test and the inner surface of the contoured cavity structure to maintain the flow of high-pressure gas. The volumetric filling block itself occupies the empty volume inside the test chamber, so that the total effective gas capacity of the test chamber is reduced to the sum of the spatial volumes formed by the tiny gap ring when the door is closed.

[0039] In actual production line testing, even if the final product has structural assembly defects, the number of gas molecules leaking into the internal cavity of the watch within a set time period is low due to the limited cross-sectional area parameters of the microscopic gaps. If a large volume of empty air is retained in the test chamber, the leaked gas molecules are distributed across the total gas volume, resulting in a slight decrease in macroscopic pressure, which is easily masked by the background thermal noise of the pressure sensing device's analog circuitry. By embedding a volume-filling block inside the chamber's physical space, the pre-reduced initial gas volume amplifies the final pressure decay in the sensor reading when gas molecule leakage occurs. The mechanical structure of the volume-filling block, through spatial compression, improves the hardware detection sensitivity of the waterproof testing system for trace gas molecule leakage events, enabling the digital signal processing module to capture the pressure drop trajectory caused by minute leaks.

[0040] As an extension to eliminate interference from environmental variables, the waterproof testing system also includes a temperature sensor installed inside the test chamber. The main control device is further used to acquire temperature drift data fed back by the temperature sensor and to perform thermodynamic benchmark compensation on the gas pressure attenuation data using the temperature drift data. The temperature sensor employs a semiconductor thermistor chip, and the sensing probe assembly is suspended in the central region of the gas flow field inside the test chamber, acquiring temperature electrical signals to characterize the macroscopic thermodynamic temperature of the gas medium inside the chamber.

[0041] In this embodiment, during the process of the servo pressurizing pump pumping gas into the test chamber to perform physical forced pressurization, the external atmospheric pressure gas undergoes mechanical compression, increasing the average kinetic energy of the gas molecules and generating heat. The gas temperature inside the test chamber rises synchronously with the system pressure during the pressurization phase. When the system enters the pressure stabilization phase, the residual heat energy of the gas inside the test chamber dissipates through the metal chamber wall to the external ambient temperature environment via heat conduction. The cooling of the internal gas temperature causes the thermal motion of the gas molecules to gradually decrease. In a constant-volume closed test system, the fluid cooling and contraction physical phenomenon manifests as a spontaneous and slow decrease in the gas pressure value monitored by the sensor.

[0042] Specifically, the thermodynamic compensation processing mechanism of the main control device is programmed as follows: at the start time of the pressure stabilization phase, the clock signal of the main control device synchronously latches the reference starting temperature value fed back by the temperature sensor and the reference starting air pressure value fed back by the pressure sensor. During the monitoring time period of the pressure stabilization phase, the main control device continuously acquires the real-time temperature value and real-time macroscopic air pressure value corresponding to the current time point according to a set high-frequency sampling time step (e.g., 1 millisecond to 10 milliseconds). The arithmetic logic unit of the main control device subtracts the current real-time temperature value from the reference starting temperature value, extracts the temperature change difference, and constructs the temperature drift data array.

[0043] Subsequently, the main control device substitutes the temperature drift data array into the bottom-layer solidified preset gas isochoric pressure reduction mathematical compensation model. The main control device solves for the theoretical pseudo-pressure slip induced by the thermodynamic cooling contraction effect through floating-point operations. Specifically, the bottom-layer solidified preset gas isochoric pressure reduction mathematical compensation model is constructed based on the physical laws of thermodynamic state evolution, and its specific solution formula is as follows: In the formula, The calculated theoretical pseudo-pressure slip value is in Pa. The reference starting air pressure value latched by the main control equipment at the start time node of the pressure stabilization phase, with the dimension of Pa; The high-precision absolute thermodynamic reference starting temperature value, in K, is latched at the starting time node of the voltage stabilization phase of the main control equipment. The absolute temperature drift data is the difference between the real-time temperature value at the current time and the baseline starting temperature value, and its dimension is K. The dimensionless correction coefficient for the non-ideal thermal expansion and contraction elastic volume of the test chamber is pre-calibrated and stored in the system register. This model quantifies the background pressure drop of the isochoric cavity caused by purely physical heat transfer effects, providing a mathematical reference benchmark for system interference removal and extraction of the true leakage.

[0044] It should be noted that the underlying physical basis of the above-mentioned mathematical compensation model for the isochoric pressure drop of the pre-set solidified gas is derived from the ideal gas law (…). Within the small temperature drift range of the voltage stabilization phase, this system uses a first-order Taylor expansion to linearize the state equation, thereby deriving the simplified engineering calculation formula mentioned above. The formula includes a correction coefficient for the non-ideal thermal expansion and contraction elastic volume of the test chamber. Its essence is to compensate for the non-ideal volumetric deformation of the test chamber made of hard metal material under slight changes in pressure and temperature. During the system's factory shipment or initial calibration phase, a standard leak-free solid zero-volume component is inserted and a step temperature excitation is applied. The least squares method is then used to analyze multiple sets of acquired data. , By performing inverse fitting on the data, the calibrated data can be obtained. The calibration process ensures the effectiveness and feasibility of the aforementioned compensation model in industrial field environments.

[0045] The main control device, in its system register, directly feeds back real-time air pressure monitoring values ​​from the pressure sensing device and performs an inverse algebraic cancellation subtraction operation with the calculated theoretical thermodynamic pressure slip value. If the system does not compensate for the thermodynamic pressure drop caused by natural temperature decline, the main control device's judgment logic will superimpose and confuse the pressure drop caused by normal physical cooling with the physical leakage pressure drop caused by leaks in the device under test. By introducing high-precision temperature sensing hardware components and integrating a compensation mathematical model at the firmware layer, the system achieves inverse compensation correction of the air pressure baseline thermal drift value. The compensation mechanism decouples and separates the thermodynamic state changes of the physical test environment from the actual leakage data of the chamber, ensuring the objectivity of the final air pressure attenuation data used to determine the device's waterproof performance.

[0046] For the acoustic physical obstacle clearing stage, the physical obstacle clearing command carries an initial vibration frequency parameter and a termination vibration frequency parameter. The frequency sweep oscillation action is characterized by a continuous increase in vibration frequency from the initial vibration frequency parameter to the termination vibration frequency parameter, covering the inherent resonant frequency corresponding to the microscopic liquid film blockage state. The initial vibration frequency parameter is set as a scalar value of the motor drive's fundamental frequency, and the termination vibration frequency parameter is set as a scalar value of the motor drive's cutoff frequency. The main control device encapsulates the above digital parameters in the underlying command issuing module according to the communication protocol. Specifically, the underlying hydrodynamic estimation mathematical model for the inherent resonant frequency corresponding to the microscopic liquid film blockage state is as follows: In the formula, The center point for estimating the intrinsic resonant frequency of the microscopic liquid film is given in Hz. The physical surface tension coefficient of fluids (such as condensate or assembly grease) adhering to the assembly gaps, with dimensions in N / m; The physical density of the adhering fluid is expressed in kg / m³. The design assembly equivalent microwidth of the assembly gap is given in meters. This refers to the dimensionless shape-constrained damping constant related to the microscopic three-dimensional boundary morphology of the slit capillary. The main control device's internal memory pre-programs a database of physical properties and tolerance configurations. This database stores the standard values ​​of the physical surface tension coefficient and physical density of various assembly fluids used in the test production line at room temperature, as well as the equivalent microscopic width and dimensionless shape-constrained damping constant of the design assembly specified in the process drawings of each assembly gap in the watch under test.

[0047] Specifically, the hydrodynamic estimation mathematical model is derived and modified from the classic Rayleigh drop vibration model by introducing the boundary condition of microscopic capillary wall adhesion. Among these, the dimensionless shape-constrained damping constant... This constant is used to characterize the dissipative and hindering effect of different slit morphologies (such as cylindrical, labyrinthine, or stepped) on acoustic energy transfer. During the R&D and finalization phase of product introduction testing equipment, engineers can determine this constant by constructing a three-dimensional microscopic finite element fluid-acoustic coupling simulation model of the corresponding slit. Alternatively, a full-frequency mechanical sweep test can be performed by injecting a reference fluid with known properties into a standard defective prototype to capture the characteristic resonance point that triggers the maximum pressure change, and then the constant can be calculated and calibrated in reverse. The above mechanism ensures the applicability of the estimation model in industrial settings.

[0048] Before performing calculations, the main control device dynamically indexes and extracts the corresponding variable parameters from the physical properties and tolerance configuration database by calling the device model identifier of the micro high-sealing watch under test, and assigns them to the underlying fluid dynamics estimation mathematical model. Based on this physical estimation model, combined with the extreme values ​​of gap processing tolerances and the distribution limits of fluid physical property variables, the main control device calculates and derives the lower limit and upper limit of frequency offset, and establishes the value of the initial vibration frequency parameter as the motor drive fundamental frequency scalar corresponding to the lower limit of frequency offset, and establishes the value of the termination vibration frequency parameter as the motor drive cutoff frequency scalar corresponding to the upper limit of frequency offset, thereby ensuring that the wideband sweep can effectively hit and cover the real randomly existing physical liquid film resonance points.

[0049] Specifically, after the radio frequency receiving component of the control motherboard of the micro high-sealing watch under test demodulates and obtains the starting vibration frequency parameter and the ending vibration frequency parameter, it outputs a frequency-gradient drive pulse waveform sequence to the digital-to-analog converter interface pin of the built-in vibration device. The instantaneous frequency of the pulse waveform is continuously increased on the time axis according to the frequency change slope function pre-written in the firmware system, with the starting vibration frequency parameter set as the origin. Under the drive of the frequency-increasing pulse current, the excitation coil of the built-in vibration device generates mechanical chatter with the frequency continuously increasing as the system clock advances. The mechanical chatter continues to operate until the instantaneous drive frequency reaches the set value corresponding to the ending vibration frequency parameter. The continuous frequency-increasing scanning action constitutes a broadband mechanical wave with frequency-increasing characteristics. The continuous physical trajectory of the frequency scan sweeps over the inherent resonant frequency point of the micro liquid film, using the frequency domain continuously increasing frequency-increasing drive mode to accommodate the unknown offset variable of the inherent resonant frequency caused by factory processing tolerances and fluid property differences.

[0050] In addition, when the main control device determines the waterproof performance of the micro high-sealing watch under test based on the air pressure attenuation data, it is specifically used to: calculate the real-time pressure drop slope corresponding to the air pressure attenuation data; and align and compare the time axis of the real-time pressure drop slope with the execution time window corresponding to the frequency sweep oscillation action using timestamps.

[0051] Specifically, the main control device motherboard is equipped with a digital signal processing module and a timing-aligned low-level register array. The analog electrical signal output from the hardware pins of the pressure sensing device is converted into discrete air pressure digital sampling point data by an analog-to-digital converter at a preset sampling frequency. The discrete air pressure digital sampling point data is continuously written to the pre-allocated memory buffer storage area of ​​the main control device. To eliminate high-frequency data spikes on the air pressure signal caused by mechanical micro-vibrations and background thermal noise of electronic components in the test environment, the digital signal processing module reads the data from the buffer storage area and calls a low-pass digital filtering algorithm for signal smoothing. The smoothing process uses a moving average window function combined with a finite impulse response digital filter to perform multiplication and addition operations on adjacent sampling points within the time series according to preset weighting coefficients, extracting smooth air pressure sequence data that characterizes the macroscopic air pressure change trend.

[0052] Furthermore, the digital signal processing module uses a preset differential time window length as the data extraction boundary and periodically extracts an array of adjacent pressure sampling points with global sampling timestamps from the smoothed pressure sequence data. For the extracted pressure sampling point array, the digital signal processing module calls a least-squares linear regression fitting algorithm to construct a two-dimensional Cartesian coordinate system based on time and pressure variables. By minimizing the sum of squared orthogonal distances from each sampling point to the fitted line, the first-order derivative scalar of the pressure value changing with the time axis within the differential time window is calculated. The derivative scalar directly corresponds to the geometric slope of the fitted line, which is represented as the real-time pressure drop slope. As the set differential time window continuously slides along the global time axis, the main control device's computational core continuously outputs the real-time pressure drop slope with time-stamped attributes, forming a slope time series array reflecting the dynamic evolution of the pressure decay rate inside the test chamber.

[0053] In the parallel system process of acquiring the slope time series array, to achieve physical timing matching between the real-time buck slope time axis and the frequency sweep oscillation action, a hardware clock synchronization mechanism is established between the master control device and the micro high-sealing watch under test. Before sending the physical clearing command, the master control device sends a clock synchronization probe message. After receiving the synchronization probe message, the kernel of the micro high-sealing watch under test records the accurate local reception time of the hardware timer and returns a response message to the master control device carrying the accurate local reception time and the internal protocol stack software processing delay parameters. The master control device comprehensively considers the round-trip electromagnetic wave transmission delay of the radio frequency space link and the internal protocol stack software processing delay parameters to calculate and obtain the global time deviation compensation amount of the heterogeneous device clock domain. Specifically, the underlying mathematical algebraic model for calculating and obtaining the global time deviation compensation amount of the heterogeneous device clock domain is: In the formula, This is the extracted global time skew compensation amount for the clock domain of the heterogeneous device; The local outbound timestamp recorded when the main control device sends a clock synchronization probe message; This refers to the accurate reception time point recorded locally by the micro high-sealing watch under test. This refers to the local inbound timestamp recorded by the main control device when it receives the response message; The internal protocol stack software processing delay parameters carried transparently in the response message are used. This model effectively removes the interference of asymmetric software dwell time from heterogeneous terminals by halving the round-trip time and algebraically subtracting it, and obtains the spatial physical link reference deviation. The underlying physical prerequisite of this time deviation compensation algorithm is that since the master control device and the micro high-sealing watch under test are both in the same closed test chamber, the radio frequency physical distance between them is at the millimeter or centimeter level. Therefore, the radio frequency spatial electromagnetic wave flight time from the master control device to the watch (downlink) and from the watch to the master control device (uplink) can be strictly regarded as symmetrical and equal. The terminal software dwell time ( The pure link round-trip time is averaged and halved (i.e., divided by 2), which can effectively reduce the random jitter error caused by electromagnetic multipath effect in industrial machine environment and ensure that the execution time window can achieve microsecond-level timestamp alignment.

[0054] When the master control device triggers the issuance of the physical obstacle clearing command control signal, the underlying task scheduler records the local global start time of the command issuance action. The master control device calculates and defines the actual global start time of the frequency sweep oscillation physical action at the device under test by adding the aforementioned global time deviation compensation value and the estimated time consumption parameters of the processor parsing the command and driving physical hardware of the micro high-sealing watch under test to the local global start time. Using the starting global time stamp as the reference starting point, the preset continuous execution physical duration of the frequency sweep oscillation action specified in the physical obstacle clearing command protocol is added to calculate and define the ending global time stamp. The continuous time closed interval formed by the starting global time stamp and the ending global time stamp is mapped as the execution time window in the algorithm. The master control device extracts the sampled global timestamps carried by each real-time buck slope in the slope time series array, performs a linear mapping comparison operation between the sampled global timestamps and the global time axis of the execution time window, and filters out the target slope data segments that fall within the physical time period of the execution time window.

[0055] It is understandable that in industrial-grade physical testing equipment, the minute mechanical vibrations of the electromechanical system during operation can cause minute elastic deformations in the metal walls of the testing chamber. This deformation periodically compresses the volume of the incompressible fluid inside the testing chamber, resulting in fluctuating, pseudo-pressure values ​​unrelated to actual physical leaks. By constructing a global timestamp alignment and binding mechanism at the underlying level, the main control device locks the terminal's built-in vibration device into a high-frequency, mechanically active physical period within the time-series pressure data stream. The system converges its software data analysis domain to the temporal causal relationship between external physical excitation energy injection events and internal pressure attenuation response events. The time axis alignment and binding logic eliminates external environmental interference and noise data within the execution time window, providing a temporal reference coordinate system for identifying microscopic liquid film rupture physical events.

[0056] When the main control device timestamps and compares the time axis of the real-time voltage drop slope with the execution time window corresponding to the frequency sweep oscillation action, it is specifically used to: determine whether the real-time voltage drop slope exhibits abrupt jump characteristics within the execution time window; if the real-time voltage drop slope exhibits the abrupt jump characteristics, and the voltage drop slope after the abrupt jump exceeds a preset leakage threshold, then it is determined that the microscopic liquid film sealing state has been successfully destroyed and the waterproof performance of the micro high-sealing watch under test is unqualified.

[0057] Before the physical clearance command is sent, the baseline pressure drop slope inside the test chamber is maintained within a low tolerance band, dominated by ambient heat transfer. When the built-in vibration device performs a frequency sweep oscillation, high-frequency mechanical wave energy is transferred to the assembly gap. At the point where the mechanical vibration frequency coincides with the natural resonant frequency of the fluid film, the microscopic liquid film's basic structure breaks. At the transient physical moment of microscopic liquid film breakage, the high-pressure test gas inside the test chamber is connected to the low-pressure cavity inside the micro-sealed watch under test. Driven by the pressure gradient between the internal and external fluids, test gas molecules generate a fluid jet transfer into the cavity of the tested terminal. The transition of the gas path from a blocked state to a macroscopically connected state causes the rate of decrease of the total gas pressure inside the test chamber to exhibit a nonlinear step increase characteristic over time.

[0058] The main control device has a jump judgment constant coefficient and a preset leakage threshold set in its internal memory. The preset leakage threshold is a critical slope constant derived from the fluid dynamics gas flow equation, based on the volume parameter of the free-flowing cavity inside the micro-high-sealing watch under test, the target test pressure setting, and the equivalent physical cross-sectional area parameter of the maximum allowable leak. Specifically, the fluid dynamics gas flow equation combines the physical mechanism of the critical sonic jet in a small hole with the back pressure dynamic hindrance attenuation effect caused by the micro-cavity of the device under test. The specific calculus equivalent formula for the derivation of this critical slope constant is as follows: In the formula, The critical slope constant (i.e., the preset leakage threshold) is defined in Pa / s, which represents the first derivative of the gas pressure over time. The fluid dynamic equivalent flow release coefficient when high-pressure gas flows through a tiny leak is dimensionless. The parameter representing the equivalent physical cross-sectional area of ​​the maximum allowable leakage hole is in m². The target test pressure is set to a value, with the dimension of Pa; is the ideal gas constant, with dimensions of J / (mol·K); To measure the real-time absolute thermodynamic temperature of the gas inside the chamber, with dimensions in K; The molar mass of the gas is measured in kg / mol. The equivalent volume parameter for the aerodynamic evolution of the dual-cavity chamber is given by the dimension m³, and its mathematical calculation constraints are as follows: ,in The gas volume inside the test chamber after the aforementioned reduction in effective space. Let be the volume parameter of the free-flowing cavity inside the miniature high-sealing watch under test. This equivalent pressure drop slope physical equation effectively avoids the risk of macroscopic nonlinear misjudgment caused by increased back pressure due to leakage in micro-volume products. It needs to be further clarified that the core physical basis for the validity of the above fluid dynamics gas leakage equation lies in the target test pressure applied by the testing equipment (…). The ratio of the pressure inside the microscopic high-sealing watch (typically several atmospheres) to the initial pressure inside the watch (typically one standard atmosphere) far exceeds the critical pressure ratio specified in gas dynamics (approximately 0.528 for air). Therefore, in the transient state of microscopic liquid film rupture, the high-pressure gas flow penetrating the tiny leak usually reaches the speed of sound, forming a typical choked flow or critical sonic jet. Under these physical boundary conditions, the fluid mass transfer rate (i.e., mass flow rate) reaches its theoretical maximum and is linearly correlated only with the gas state parameters of the upstream test chamber, thus reducing the interference from the initial rise of the back pressure inside the downstream watch. Furthermore, the equivalent volume parameters of the dual-chamber aerodynamic evolution... Based on Boyle's law and the law of conservation of mass, the macroscopic volume of the test chamber and the microscopic free-flowing cavity inside the watch are connected in series for equivalent dimensionality reduction transformation, which ensures the universality and accuracy of the slope threshold calculation from a mathematical topological perspective.

[0059] The logic judgment and operation unit monitors the target slope data segment array falling within the execution time window in real time. The logic judgment and operation unit calculates the discrete difference between adjacent real-time pressure reduction slope sampling points to obtain characteristic parameters representing the acceleration of pressure reduction slope changes. If, within the time scale axis covered by the execution time window, the logic identifies that the value of the characteristic parameter crosses the limit of the jump judgment constant coefficient, it determines that a sharp increase in the pressure reduction slope has occurred, and confirms that the algorithm has captured the abrupt jump feature. The physical and statistical basis for setting the jump judgment constant coefficient is as follows: extracting the real-time pressure reduction slope sequence within a thermodynamically stable background time window before the physical obstacle clearing command is issued during the pressure stabilization phase, calculating the background standard deviation of this background slope data array, and fixing the jump judgment constant coefficient to 3 to 5 times this background standard deviation. Based on this statistical 3σ criterion adaptive calibration boundary, the system can effectively filter out false data jump interference caused by micro-vibrations in the factory's electromechanical environment, ensuring high sensitivity capture of the jet characteristics at the instant of real micro-liquid film rupture.

[0060] After the algorithm identifies the abrupt jump feature, the main control device shifts the memory observation time window backward, extracts multiple real-time pressure drop slopes during the steady-state leakage physical stage after the fluid jump transient subsides, and performs sliding smoothing calculations to obtain the pressure drop slope parameters after the abrupt change. The logic judgment and operation unit compares the pressure drop slope parameters after the abrupt change with the preset leakage threshold. If the absolute value of the pressure drop slope after the abrupt change is greater than the absolute value of the preset leakage threshold, it indicates that the equivalent aperture of the terminal physical channel exceeds the engineering safety boundary limit. Based on the above logic operation results, the internal state machine of the main control device jumps to the leakage confirmation alarm state, generating a test judgment conclusion indicating that the tested miniature high-sealing watch has a physical sealing defect and its waterproof performance is unqualified.

[0061] By locking the slope abrupt change characteristics within the execution time window, the data of the entire process of physical destruction of the micro liquid film is captured, and the terminal assembly defects are distinguished from the background micro-leakage noise of the test system at the algorithm level.

[0062] As a system protection configuration, the main control device is also used to: after determining that the waterproof performance of the micro high-sealing watch under test is unqualified, send a stop oscillation command to the micro high-sealing watch under test through the wireless communication device, and control the pressure regulating device to release the gas inside the test chamber according to a preset pressure reduction rate.

[0063] Specifically, after the algorithm determines that the process outputs an unqualified system status flag, the exception handling subroutine is interrupted and awakened. The exception handling subroutine encapsulates a data frame containing a low-level stop operation code segment and generates the stop oscillation command. The wireless communication device modulates the stop oscillation command into a radio frequency carrier signal and sends it to the micro-high-sealing watch under test. After receiving the stop operation code, the microprocessor hardware inside the tested terminal cuts off the physical power link to the drive circuit of the built-in vibration device. The mechanical rotor inside the built-in vibration device stops its reciprocating physical motion due to mechanical damping. Cutting off the mechanical vibration energy source interrupts the continuous tensile effect of structural physical stress.

[0064] In addition, the main control device takes over the control of the pressure relief pneumatic channel. A proportional electromagnetic pressure relief valve driven by a pulse-width modulation signal is installed in the air circuit of the pressure regulating device. High-pressure gas has seeped into the cavity of the device under test due to a macroscopic physical leak. If the test system adopts the method of transiently fully opening the pressure relief valve to empty the test chamber, the macroscopic air pressure inside the chamber will drop vertically. The residual high-pressure gas inside the terminal is physically restricted from dissipating outward due to the air resistance effect of the micropores, resulting in an instantaneous outward expansion pressure difference between the inside and outside of the watch. This outward expansion pressure difference causes irreversible physical delamination damage to the screen cover. The main control device retrieves preset pressure reduction rate parameters from memory and adjusts the fluid displacement opening of the proportional electromagnetic pressure relief valve in a closed loop. The specific closed-loop control logic is as follows: During the dynamic fluid release process of pressure relief, the main control device uses the real-time attenuated air pressure value fed back from the pressure sensing device at high frequency as the dynamic feedback input and calls the digital differentiator to calculate the first derivative of the air pressure attenuation in real time. The main control device, through its internal PID calculation module, compares the first derivative of the real-time pressure decay with the preset pressure reduction rate parameter in real time and calculates the difference. This difference generates a pulse-width modulated digital signal with nonlinear compensation characteristics to dynamically correct the pilot coil drive voltage of the proportional electromagnetic pressure relief valve. Through this reverse dynamic compensation mechanism, the system overcomes the inherent exponential deceleration physical decay law of gas leakage, thereby ensuring that the high-pressure gas inside the test chamber is released to the external environment according to a controlled, smooth, linear pressure reduction slope. The controlled linear pressure relief physical mechanism allows for a physical transition time for the natural backflow of high-pressure gas inside the terminal, maintaining a dynamic balance of pressure difference between the inside and outside of the watch.

[0065] A control method for a waterproof testing system of miniature high-sealing watches, applied to a waterproof testing system of miniature high-sealing watches, referenced... Figure 2 As shown, the control method includes: Step S10: Establish a communication connection with the micro high-sealing watch under test via a wireless communication device; Step S20: Control the pressure regulating device to apply the target test gas pressure to the test chamber; Step S30: During the pressure stabilization phase after applying the target test air pressure, a physical clearance command is sent to the micro high-sealing watch under test through the wireless communication device to control the micro high-sealing watch under test to call the built-in vibration device to perform a frequency sweep oscillation action, thereby using the frequency sweep oscillation action to destroy the micro liquid film sealing state on the surface of the micro high-sealing watch under test. Step S40: During the pressure stabilization stage, the pressure attenuation data fed back by the pressure sensing device is acquired, and the waterproof performance of the micro high-sealing watch under test is determined based on the pressure attenuation data.

[0066] Specifically, during step S10, the master control device's underlying task scheduling radio frequency hardware peripheral components transmit a system paging beacon on a specific carrier frequency band, and complete protocol version negotiation and hardware identity verification with the terminal under test at the data link layer. A bidirectional transparent communication physical channel is established, enabling the master control operation commands to be written into the control hardware registers of the terminal under test.

[0067] When executing step S20, the main control device sends drive operating parameters to the pressure regulating pump assembly via the internal communication bus. The pressure regulating pump compresses the external atmospheric pressure physical fluid into the test chamber space. The main control algorithm module extracts the real-time static pressure variable inside the chamber and calculates the difference with the set target test pressure reference parameter. Based on the magnitude of the difference parameter, the working power of the pump motor is dynamically adjusted using a closed-loop proportional-integral mathematical calculation rule. When the real-time static pressure variable enters the target tolerance parameter range, the main control device sends a close control word to lock the exhaust mechanical valve, and the system timing switches to the constant pressure stabilization stage.

[0068] When executing step S30, the main control device reads the structural material characteristic parameter table of the terminal under test, maps the frequency conversion step size setting value and the physical range boundary of the frequency scan, encapsulates it into a physical obstacle clearing control command, and sends it through the radio frequency communication channel. The application layer processor of the terminal under test inputs a sequence of square wave electrical signals with continuously increasing pulse frequency to the underlying drive circuit of the motor. The high-frequency mechanical wave propagates along the joints of the terminal structure to the outer shell. When the scanning physical frequency approaches the inherent resonant frequency of the attached microscopic liquid film, the acoustic standing wave energy induces displacement deformation of the physical liquid film. The microscopic liquid film structure breaks, and the physical blockage of the fluid sealing channel is eliminated.

[0069] When executing step S40, the main control device continuously acquires time-series pressure physical sample points transmitted by the high-precision pressure sensing device. The built-in algorithm of the main control device performs digital low-pass filtering and differential differentiation operations on the sample set array to extract derivative feature maps characterizing the actual leakage situation. The algorithm core identifies step abrupt changes in the derivative feature maps within the frequency sweep excitation time window, verifies the relationship between the steady-state derivative parameter value and the safety leakage threshold constant, and outputs the final judgment conclusion.

[0070] The smartwatch, as the micro high-sealing watch under test in the waterproof testing system for micro high-sealing watches, refers to... Figure 3 As shown, the smartwatch is internally configured with a control motherboard, a communication transceiver component connected to the control motherboard, and a built-in vibration device connected to the control motherboard; the communication transceiver component is used to receive physical clearing commands sent by the main control device; the control motherboard is used to parse the physical clearing commands and drive the built-in vibration device to perform frequency sweep oscillation, so as to cooperate with the waterproof testing system of the miniature high-sealing watch to break the microscopic liquid film sealing state on the surface.

[0071] Specifically, the smartwatch physically comprises a load-bearing metal frame, a transparent protective cover attached to the upper part of the load-bearing metal frame, and a back cover assembly attached to the back of the load-bearing metal frame. Assembly gaps are provided at the physical joints of various components, the mechanical movement gaps of the buttons, and the assembly positions of the breathable and waterproof membrane. The internal mechanical structure of the smartwatch includes a core circuit space, within which the control motherboard is fixed. A microcontroller unit, a power management chip, and environmental sensors are soldered onto the surface of the control motherboard.

[0072] The communication transceiver component comprises a radio frequency antenna, a radio frequency impedance matching network, and a baseband digital signal processing module, all located at the edge of the circuit board. When the smartwatch is in production line testing and factory release mode, the microcontroller unit kernel allocates system hardware resources to the radio frequency port listening process. When the radio frequency antenna receives the carrier electromagnetic field transmitted by the external master control device, it converts the high-frequency carrier into a high-frequency AC voltage analog signal. The high-frequency AC voltage analog signal flows through the radio frequency impedance matching network into the radio frequency receiving front end, where it is amplified, mixed down-shifted, and processed by analog-to-digital conversion circuits to restore the baseband digital bitstream carrying control logic information. The communication transceiver component transmits the baseband digital bitstream to the underlying computing kernel of the control board. The computing kernel performs network data unpacking, redundancy check verification, and frame payload extraction. After recognizing the physical obstacle clearing instruction opcode, the kernel extracts the frequency converter control digital configuration parameters and calls the motor control interface function to start the microcontroller timer module.

[0073] The built-in vibration device adopts a micro linear resonant motor structure, with the outer metal base attached to the inner wall of the alloy load-bearing metal frame via vibration-guiding double-sided adhesive tape. The microcontroller timer module, according to the analytical frequency digital configuration parameters, outputs a digital control signal with a continuously varying pulse width, whose frequency changes with the clock, to the external drive chip of the motor. The external drive chip converts the logic digital signal into an alternating drive current, which is then injected into the excitation coil. Under the action of the alternating electromagnetic field, the suspended mass block inside the built-in vibration device undergoes reciprocating mechanical displacement. The continuous change in the drive control signal frequency causes the mechanical motion to exhibit sweeping flutter characteristics. The mechanical flutter wave physically couples from the metal base into the alloy load-bearing frame and radiates in all directions to the outer shell of the terminal. When the energy flow of the mechanical flutter wave reaches the water film residence point in the gap, the flutter wave induces a physical relative displacement of the sidewall of the assembly gap. The flutter wave continuously sweeps across the droplet itself, forming the inherent resonant frequency point of the elastic damping system. Under the action of resonant coupling, the fluid film structure breaks apart. The terminal emits physical excitation to cooperate with the external test chamber, eliminating the microscopic physical sealing characteristics that hinder the permeation of test gases.

[0074] The smartwatch is considered as a smart terminal capable of responding to physical actions, forming a physical collaborative detection and control data link within the testing equipment. The terminal's internal conventional notification vibration hardware resources and data interaction radio frequency channels are reused, endowing the terminal device with physical automatic obstacle clearance capabilities. The smartwatch itself and the external factory testing equipment are integrated into a feedback detection system at the underlying level of physical spatial actions and control signal flow. The terminal device's underlying physical hardware actively coordinates actions, eliminating the limitation of static high-pressure gas testing equipment being unable to overcome local microscopic liquid film resistance effects.

[0075] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A waterproof testing system for a miniature high-sealing watch, comprising a test chamber, a pressure regulating device communicating with the test chamber, and a pressure sensing device disposed in the test chamber for monitoring air pressure values, wherein the test chamber is used to accommodate the miniature high-sealing watch to be tested; Its features are, The waterproof testing system also includes a main control device and a wireless communication device connected to the main control device; The main control device is used to establish a communication connection with the micro high-sealing watch under test through the wireless communication device; The main control device is also used to control the pressure regulating device to apply the target test gas pressure to the test chamber; The main control device is also used to send a physical clearance command to the micro high-sealing watch under test through the wireless communication device during the pressure stabilization stage after the target test air pressure is applied, so as to control the micro high-sealing watch under test to call the built-in vibration device to perform a frequency sweep oscillation action, thereby using the frequency sweep oscillation action to destroy the micro liquid film sealing state on the surface of the micro high-sealing watch under test. The main control device is also used to acquire the air pressure attenuation data fed back by the pressure sensing device during the pressure stabilization phase, and determine the waterproof performance of the micro high-sealing watch under test based on the air pressure attenuation data.

2. The waterproof testing system for a miniature high-sealing watch according to claim 1, characterized in that, The pressure regulating device includes a servo pressurizing pump and an exhaust pressure relief valve connected in series with the servo pressurizing pump. The main control device is electrically connected to the servo pressurizing pump and the exhaust pressure relief valve, respectively.

3. The waterproof testing system for a miniature high-sealing watch according to claim 2, characterized in that, The test chamber is equipped with a volume filling block, which occupies the empty space inside the test chamber to reduce the gas volume inside the test chamber.

4. The waterproof testing system for a miniature high-sealing watch according to claim 3, characterized in that, The waterproof testing system also includes a temperature sensor installed inside the test chamber. The main control device is also used to acquire temperature drift data fed back by the temperature sensor and to use the temperature drift data to perform thermodynamic reference compensation on the air pressure attenuation data.

5. The waterproof testing system for a miniature high-sealing watch according to claim 1, characterized in that, The physical obstacle clearing command carries an initial vibration frequency parameter and an ending vibration frequency parameter; the frequency sweeping oscillation action is characterized by the vibration frequency continuously increasing from the initial vibration frequency parameter to the ending vibration frequency parameter, so as to cover the inherent resonance frequency corresponding to the microscopic liquid film blocking state.

6. The waterproof testing system for a miniature high-sealing watch according to claim 5, characterized in that, When determining the waterproof performance of the micro high-sealing watch under test based on the air pressure decay data, the main control device is specifically used for: Calculate the real-time pressure drop slope corresponding to the pressure decay data; The time axis of the real-time voltage reduction slope is timestamped and compared with the execution time window corresponding to the frequency sweep oscillation action.

7. The waterproof testing system for a miniature high-sealing watch according to claim 6, characterized in that, When the main control device performs timestamp alignment and comparison between the time axis of the real-time voltage reduction slope and the execution time window corresponding to the frequency sweep oscillation action, it is specifically used for: Determine whether the real-time pressure reduction slope exhibits abrupt jump characteristics within the execution time window; If the real-time pressure drop slope exhibits the abrupt jump characteristic, and the pressure drop slope after the abrupt jump exceeds the preset leakage threshold, then it is determined that the microscopic liquid film sealing state has been successfully destroyed and the waterproof performance of the micro high-sealing watch under test is unqualified.

8. The waterproof testing system for a miniature high-sealing watch according to claim 7, characterized in that, The main control device is also used for: After determining that the waterproof performance of the micro high-sealing watch under test is unqualified, a stop oscillation command is sent to the micro high-sealing watch under test through the wireless communication device, and the pressure regulating device is controlled to release the gas inside the test chamber according to the preset pressure reduction rate.

9. A control method for a waterproof testing system of a miniature high-sealing watch, applied to the waterproof testing system of a miniature high-sealing watch according to any one of claims 1 to 8, characterized in that, The control method includes: Establish a communication connection with the micro high-sealing watch under test via a wireless communication device; The pressure regulating device is used to apply the target test air pressure to the test chamber; During the pressure stabilization phase after applying the target test air pressure, a physical clearance command is sent to the micro high-sealing watch under test through the wireless communication device to control the micro high-sealing watch under test to call the built-in vibration device to perform a frequency sweep oscillation action, thereby using the frequency sweep oscillation action to destroy the micro liquid film sealing state on the surface of the micro high-sealing watch under test. During the pressure stabilization phase, the pressure decay data fed back by the pressure sensing device is acquired, and the waterproof performance of the micro high-sealing watch under test is determined based on the pressure decay data.

10. A smartwatch, comprising the micro high-sealing watch under test in the waterproof testing system for a micro high-sealing watch according to any one of claims 1 to 8, characterized in that, The smartwatch is equipped with a control motherboard, a communication transceiver component connected to the control motherboard, and a built-in vibration device connected to the control motherboard. The communication transceiver component is used to receive physical obstacle clearing commands sent by the main control device; The control motherboard is used to parse the physical obstacle clearing command and drive the built-in vibration device to perform frequency sweep oscillation, so as to cooperate with the waterproof testing system of the miniature high-sealing watch to destroy the microscopic liquid film sealing state on the surface.

Images