Waterproof breathable bed sheet detection device and method

Abstract

The invention discloses a waterproof and breathable bed sheet detection device and method, relates to the technical field of new material detection, and is particularly suitable for performance detection of a novel functional composite material waterproof and breathable bed sheet. The device comprises a detection cabin body mechanism, a dynamic air pressure monitoring system, an air source regulation and control module and an intelligent control unit, the detection cabin mechanism clamps a sample in a sealed mode through butt joint of a lower cylinder assembly and an upper cylinder assembly, the dynamic air pressure monitoring system synchronously collects air pressure of all cavities through multiple sensors, the air source regulation and control module selectively supplies air, and the intelligent control unit achieves detection mode switching and data integration. According to the method, the regional performance difference of the new material bed sheet can be accurately captured, the detection and measurement precision is improved, new material detection standardized parameters are automatically adapted, authentication and acceptance service data requirements are directly supported, the detection period is shortened, and an efficient and accurate detection scheme is provided for quality evaluation of novel composite material home textile products.

Description

Technical Field

[0001] This invention relates to the field of new material testing technology, specifically to a new material bed sheet testing technology, and more specifically to a waterproof and breathable bed sheet testing device and method. Background Technology

[0002] With the rapid penetration of new material technologies into the smart home field, waterproof and breathable bed sheets have upgraded from traditional cotton textiles to a product system centered on new functional composite materials (such as PTFE microporous composite membranes, antibacterial modified polyester fibers, and hydrophilic and hydrophobic block copolymer coating materials). These new materials achieve synergistic performance of "waterproof and liquid-resistant" and "breathable and moisture-wicking" through microstructural regulation, becoming the core carrier for the high-end development of the home textile industry. The stability and consistency of the performance of new materials directly rely on professional new material testing services. On the one hand, the multi-component synergistic effect of new materials (such as the bonding strength of the membrane-fiber composite interface and the uniformity of the coating) will lead to significant differences in the breathability / waterproof performance of different areas of the bed sheet, requiring targeted testing solutions. On the other hand, downstream brand owners and quality inspection agencies must rely on testing data that meets national standards to ensure that the application of new materials meets market access requirements.

[0003] While existing waterproof and breathable performance testing devices (such as patent publication numbers CN212059817U and CN207908311U) exist, they all have significant limitations in adapting to new material testing services. First, existing devices are mostly designed for traditional single-material bed sheets and cannot capture the performance differences of new materials across multiple regions (such as the difference in air resistance between the composite film seam and the main body area), resulting in test data that cannot reflect the actual application performance of new materials. Second, the testing process relies on manual reading of scales and judgment of leakage, which is not only inefficient but also results in high data dispersion, making it difficult to meet the needs of new material testing services for "precise measurement" and "batch screening." Third, existing devices are not integrated with standardized procedures for new material testing and cannot automatically adjust test parameters according to the performance thresholds of different new materials, requiring repeated manual adjustments, which severely restricts the large-scale implementation of new material testing services.

[0004] Furthermore, with the increasing demand for certification and accreditation of new material products in the home textile industry, the authority and traceability of testing data have become crucial. However, existing devices lack automatic data uploading, curve analysis, and report generation functions, failing to provide standardized data support for certification and accreditation services. This leads to a prolonged cycle from R&D to market access for new material bed sheets, hindering the rapid transformation of new material technologies in the civilian sector. Therefore, developing a waterproof and breathable bed sheet testing device that adapts to the needs of new material testing services and balances accuracy, automation, and standardization has become a core requirement for addressing the current pain points in quality control of new material home textile products. Summary of the Invention

[0005] The purpose of this invention is to provide a waterproof and breathable bed sheet testing device and method to solve the problems mentioned in the background art.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: The present invention provides a waterproof and breathable bed sheet testing device, comprising: The testing chamber mechanism includes a lower cylinder assembly and an upper cylinder assembly capable of docking and sealing the bed sheet sample. The lower cylinder assembly forms an independent lower central cavity and a lower annular cavity. The upper cylinder assembly forms an upper central cavity corresponding to the lower central cavity and multiple sector cavities corresponding to the lower annular cavity. Each sector cavity is connected to the top of the upper central cavity through a through hole. A dynamic air pressure monitoring system, including sensors for detecting air pressure in the upper central cavity, sector cavity and lower central cavity; The gas source control module is selectively connected to the lower central cavity or the lower annular cavity to provide detection gas; The intelligent control unit, connected to the air pressure sensor and air source control module, can continuously detect the waterproofness and breathability of the bed sheet sample by switching the air supply to the lower central cavity or the lower annular cavity.

[0007] Furthermore, the detection chamber mechanism also includes a base box, the lower cylinder assembly is detachably installed on the top of the base box, and the upper cylinder assembly is detachably installed on the top of the lower cylinder assembly via a connecting device; the bottom of adjacent sector cavities is provided with a connecting gap.

[0008] Furthermore, the base housing is provided with a first air supply pipeline and an exhaust circuit connected to the lower central cavity, and a second air supply pipeline connected to the lower annular cavity. The first air supply pipeline, the second air supply pipeline, and the exhaust circuit are all equipped with electromagnetic regulating valves. The intelligent control unit controls the electromagnetic regulating valves to switch the pipelines on and off.

[0009] Furthermore, the mating surfaces of the lower cylinder assembly and the upper cylinder assembly are provided with a sealing structure, the sealing structure including an annular groove and an annular sealing ring embedded in the annular groove, and the inner sidewall of the annular groove is provided with anti-detachment protrusions; the connecting device includes symmetrically arranged locking buckles.

[0010] Furthermore, the dynamic air pressure monitoring system includes a first sensor for detecting the air pressure in the sector cavity, a second sensor for detecting the air pressure in the upper central cavity, and a third sensor for detecting the air pressure in the lower central cavity.

[0011] Furthermore, the air source control module includes an air compressor, a pressure buffer tank, and a PID controller. The pressure buffer tank is equipped with an airflow distribution plate. A filter and a pressure regulating component are connected in series at the outlet end of the pressure buffer tank. The PID controller realizes dynamic adjustment of the air supply pressure through closed-loop control. The intelligent control unit is connected to and controls the PID controller.

[0012] Furthermore, the lower cylinder assembly includes a lower middle cylinder and a transparent lower cylinder body arranged coaxially; the upper cylinder assembly includes a transparent upper cylinder body and a partition module, the partition module includes a sealed top cover, an upper middle cylinder and a radial partition, the radial partition and the inner wall groove of the transparent upper cylinder body cooperate to form a fan-shaped cavity.

[0013] The present invention also provides a testing method for a waterproof and breathable bed sheet testing device, comprising the following steps: Step 1: Seal and clamp the sheet sample between the lower and upper cylinder components. Inject liquid into the fan-shaped cavity of the upper cylinder component to cover the corresponding area of ​​the sample. Let it stand for a preset time to remove air bubbles. Step 2: The gas source control module introduces the detection gas into the lower annular cavity. The dynamic pressure monitoring system collects the pressure data of the sector cavity, the upper central cavity and the lower central cavity, and calculates the air permeability index by combining the distribution of bubbles in the sector cavity. Step 3: The intelligent control unit switches the gas supply channel and introduces detection gas into the lower central cavity through the gas source regulation module. The stability of the gas pressure in the lower central cavity is monitored, and the waterproof performance index is determined by combining the sample leakage observation results. Step 4: The intelligent control unit integrates the data and outputs a test report that includes air permeability, air permeability uniformity, and waterproof pressure threshold.

[0014] Furthermore, the preset settling time in step one is 3-10 minutes, and the injected liquid is deionized water or a test liquid that matches the detection standard.

[0015] Furthermore, the gas to be detected in step two is a constant-pressure gas, with the pressure value preset according to the detection standard, and the acquisition frequency of each sensor remains consistent; the distribution state of the bubbles is recorded by an image acquisition device or manually.

[0016] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects: 1. This invention utilizes a partitioned structure consisting of a lower central cavity and a lower annular cavity in the lower cylinder assembly, and an upper central cavity and multiple sector cavities in the upper cylinder assembly. This allows for targeted capture of regional performance differences in novel functional composite materials (such as PTFE microporous composite membrane sheets and antibacterial modified polyester fiber sheets). It can detect the basic breathability / waterproof performance of the main area of ​​the composite membrane, and accurately identify performance fluctuations in key areas such as membrane-fiber splices and coating edges. This solves the problem that existing devices can only detect a single material and cannot reflect the synergistic effect of multiple components in new materials, providing "full-area coverage" performance data support for new material testing services.

[0017] 2. The dynamic air pressure monitoring system of this invention achieves synchronous air pressure acquisition of the sector cavity, upper central cavity, and lower central cavity through the first sensor, second sensor, and third sensor respectively. Combined with the constant pressure air source controlled by the closed loop of the PID controller, it can quantitatively output key measurement indicators such as the air permeability and waterproof pressure threshold of the new material bed sheet. It replaces the traditional method of manually observing the scale and estimating data, which fully matches the core requirement of accurate measurement for new material testing services and provides a highly reliable basis for subsequent quality judgment.

[0018] 3. The intelligent control unit of this invention can preset the testing standard parameters corresponding to different new materials (such as the air permeability threshold for PTFE composite film sheets, and the waterproof rating requirements for hydrophilic and hydrophobic block copolymer sheets), and automatically switch parameters such as air supply pressure and collection cycle, without the need for repeated manual adjustments; at the same time, the device can automatically generate a standardized test report containing air pressure change curves and performance index compliance status, directly connecting to the data format requirements of certification and accreditation services, eliminating the secondary data processing step in traditional testing, and shortening the cycle from testing to market access for new material sheets.

[0019] 4. Based on the design that allows for continuous switching between air permeability and waterproof testing modes without disassembling the sample, this invention shortens the single-sample testing cycle to 10-15 minutes and supports the addition of testing stations through modular expansion. Combined with the visualization and image acquisition functions of the transparent cylinder, it can quickly record the microscopic response of new materials during the testing process (such as the bubble formation pattern of composite membranes and the leakage morphology of coatings). This not only meets the needs of small-batch performance verification in the research and development stage of new materials, but also adapts to large-scale quality screening in the production end, providing equipment support for the large-scale promotion of new material testing services.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the lower cylinder assembly of the present invention; Figure 3 This is a schematic diagram of the internal structure of the upper cylinder assembly of the present invention; Figure 4 This is a schematic diagram of the first gas supply pipeline, the second gas supply pipeline, and the exhaust circuit of the present invention; Figure 5 This is a top view of the structure of the present invention; Figure 6 yes Figure 5 Schematic diagram of the structure at point AA; Figure 7 yes Figure 6 A partial structural diagram at point A.

[0023] In the picture: 1-Detection chamber mechanism; 11-Base box; 12-Lower cylinder assembly; 121-Lower central cavity; 122-Lower annular cavity; 123-Lower middle cylinder; 124-Transparent lower cylinder; 13-Upper cylinder assembly; 131-Upper central cavity; 132-Fan-shaped cavity; 133-Connecting gap; 134-Through hole; 135-Transparent upper cylinder; 1351-Slot; 136-Separation module; 1361-Sealed top cover; 13611-Water inlet; 13612-Sealed cover; 1362-Upper middle cylinder; 1363-Radial partition; 14-Connecting device; 141-Locking buckle; 15-First air supply pipeline; 16-Second air supply pipeline; 17-Exhaust circuit; 18-Electromagnetic regulating valve; 21-First sensor; 22-Second sensor; 23-Third sensor; 31-Annular sealing ring; 32-Annular groove. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0025] Please see Figures 1-7This invention provides a waterproof and breathable bed sheet testing device, which is particularly suitable for testing bed sheets made of new functional composite materials such as PTFE microporous composite membrane and antibacterial modified polyester fiber. The device includes a testing chamber mechanism 1, a dynamic air pressure monitoring system, an air source control module (not shown), and an intelligent control unit (not shown).

[0026] The detection chamber mechanism 1 serves as the core carrier for detection and adopts a detachable docking structure. Specifically, the detection chamber mechanism 1 includes a base box 11 and a lower cylinder assembly 12 and an upper cylinder assembly 13 that can be docked and sealed. The base box 11 is the overall support foundation, and its interior is pre-set with a detection parameter storage module adapted to the "Waterproof and Breathable Textiles" standard. The top of the base box 11 is equipped with the detachable lower cylinder assembly 12 and upper cylinder assembly 13. The lower cylinder assembly 12 is structurally separated to form an independent lower central cavity 121 and a lower annular cavity 122, which correspond to different detection functions.

[0027] The upper cylinder assembly 13 covers the top of the lower cylinder assembly 12, and the interior of the upper cylinder assembly 13 is radially divided to form an upper central cavity 131 and a plurality of sector cavities 132. The upper central cavity 131 corresponds to the lower central cavity 121, and the plurality of sector cavities 132 correspond to the lower annular cavity 122. The sector cavities 132 are connected to each other through a connecting gap 133, and the top of each sector cavity 132 is connected to the upper central cavity 131 through a through hole 134 to meet the requirements of air pressure conduction.

[0028] The top of the base housing 11 is equipped with multiple pipelines. Specifically, the top of the base housing 11 is provided with a first gas supply pipeline 15 and an exhaust circuit 17 that are connected to the lower central cavity 121, and a second gas supply pipeline 16 that is connected to the lower annular cavity 122. Each pipeline (the first gas supply pipeline 15, the exhaust circuit 17, and the second gas supply pipeline 16) is equipped with an electromagnetic regulating valve 18 to achieve precise control of the gas passage and adapt to the needs of rapid switching of multiple parameters in the testing of new materials.

[0029] The dynamic air pressure monitoring system is equipped with dedicated sensors for different cavities (sector cavity 132, upper central cavity 131 and lower central cavity 121). Specifically, the dynamic air pressure monitoring system includes a first sensor 21 for detecting the air pressure of sector cavity 132, a second sensor 22 for detecting the air pressure of upper central cavity 131, and a third sensor 23 for detecting the air pressure of lower central cavity 121, so as to capture the air pressure changes of sector cavity 132, upper central cavity 131 and lower central cavity 121 in real time.

[0030] The gas source control module provides stable gas to the gas pipeline through a multi-channel interface. Specifically, the gas source control module is connected to the first gas pipeline 15 and the second gas pipeline 16 through a multi-channel interface to provide detection gas. The intelligent control unit serves as the core control hub. It connects to and controls the air source regulation module and the electromagnetic regulating valve 18 to selectively supply air to the lower annular cavity 122 or the lower central cavity 121. It also receives detection data from the dynamic air pressure monitoring system and analyzes air pressure changes to detect the waterproofness and breathability of the bed sheet sample.

[0031] Before testing, the sheet sample is laid flat on top of the lower tube assembly 12. Then, the upper tube assembly 13 is installed on top of the lower tube assembly 12 through the connecting device 14, so that the sheet sample is clamped between the lower tube assembly 12 and the upper tube assembly 13. Then, an appropriate amount of liquid is injected into the fan-shaped cavity 132 to completely cover the corresponding area of ​​the sample. This provides a visual carrier for observing bubbles during air permeability testing and creates clear observation conditions for judging leakage during waterproof testing.

[0032] During testing, this device has two testing modes. In the first testing mode, the intelligent control unit regulates the electromagnetic regulating valve 18 to close the first gas supply line 15 and open the second gas supply line 16 and the exhaust circuit 17. The gas source stably supplies gas to the downward annular cavity 122 through the second gas supply line 16. Due to the breathability of the bed sheet, the gas passes through the sample and enters the sector cavity 132. The bubbles generated in the liquid can intuitively reflect the local air permeability rate (the greater the bubble density and the higher the generation frequency, the stronger the air permeability of the corresponding area). The first sensor 21 monitors the air pressure of each sector cavity 132 in real time. If the air pressure of each sector cavity 132 remains stable and the difference is within the preset threshold, it indicates that the air permeability of each area of ​​the sample is uniform. The gas that permeates into the fan-shaped cavity 132 gradually flows into the upper central cavity 131 through the top through hole 134, causing the gas pressure in the upper central cavity 131 to rise dynamically over time. The second sensor 22 records the pressure change curve of this process in real time. The intelligent control unit can calculate the basic value of air permeability per unit area per unit time by analyzing the slope of the pressure rise from the initial value to the stable value (the larger the slope, the faster the gas permeation rate) and the time to reach stability (the shorter the time, the smaller the initial air permeability resistance of the sample). Meanwhile, the gas in the upper central cavity 131 can permeate through the corresponding area of ​​the sample to the lower central cavity 121 again. The third sensor 23 synchronously monitors the pressure change in the lower central cavity 121. By comparing the pressure difference between the upper central cavity 131 and the lower central cavity 121 in the same time period (the ratio when the difference is stable reflects the gas permeability resistance coefficient), the permeability resistance of the sample to the gas can be further accurately quantified. Once the air pressure in each chamber reaches dynamic equilibrium, the system continuously monitors the pressure fluctuation over 3-5 minutes. If the fluctuation amplitude is less than a preset threshold, the sample is deemed to have good air permeability stability. The intelligent control unit integrates the aforementioned local pressure differences, pressure rise rate, equilibrium pressure difference, and fluctuation data, combined with image recordings of bubble distribution (observed through a transparent cylinder or archived via an image acquisition device), and finally transforms them into multi-dimensional quantitative indicators such as air permeability, air permeability uniformity, air permeability resistance coefficient, and long-term stability, achieving a comprehensive evaluation of the air permeability of the bed sheet sample.

[0033] In the second detection mode: the intelligent control unit adjusts the state of the electromagnetic regulating valve 18 through the mode switching module, closes the second air supply line 16 and the exhaust circuit 17 to cut off the air permeability detection path, and at the same time opens the first air supply line 15. Under the control of the intelligent control unit, the gas source regulation module introduces the detection gas into the lower central cavity 121 through the first air supply line 15. The gas pressure gradually increases at a preset rate (such as 0.01-0.05MPa / min) to simulate waterproof test conditions of different pressure levels.

[0034] The gas in the lower central cavity 121 permeates upward through the bed sheet sample due to the pressure difference, causing the gas pressure in the upper central cavity 131 to rise synchronously. Then, it is evenly conducted to each sector cavity 132 through the top through hole 134. The second sensor 22 (upper central cavity) and the first sensor 21 (sector cavity) monitor the pressure conduction status in real time. If the pressure rise trend of each cavity is consistent and the difference is within the allowable range, it indicates that the sample is subjected to uniform force and the detection conditions are effective.

[0035] After the system pressure reaches the preset detection level (such as 0.1MPa, 0.3MPa, etc.) and remains stable for 3-5 minutes, the operator observes through the transparent lower cylinder (124) whether there are water seepage marks, water droplet condensation or liquid leakage at the bottom of the sample (lower central cavity side), and at the same time observes through the transparent upper cylinder (135) whether the liquid in the fan-shaped cavity 132 has decreased due to sample leakage.

[0036] The third sensor 23 continuously monitors the pressure stability of the lower central cavity 121. If the pressure drops abnormally, it is determined that the sample has leaked. The system automatically records the pressure value at this time as the "first leakage pressure threshold". If there is no leakage and the pressure is stable for 10 minutes under the highest preset pressure, it is determined that the waterproof performance of the sample meets the standard.

[0037] The data analysis module of the intelligent control unit integrates the pressure change curve recorded by the third sensor 23, the leakage observation record (the leakage moment can be captured by the image acquisition device in the existing technology), and the tolerance time under each pressure level. Finally, it outputs quantitative indicators such as waterproof pressure threshold, maximum tolerance pressure, and pressure retention rate, which comprehensively reflect the liquid barrier capability of the bed sheet sample under dynamic pressure.

[0038] Throughout the entire testing process, the intelligent control unit achieves fully automated control through a preset program. That is, after completing the air permeability test (first mode), there is no need to disassemble the sample or replace any core components. Simply adjust the on / off state of the electromagnetic regulating valve 18 through the mode switching module to seamlessly switch to the second mode, which greatly improves the testing efficiency.

[0039] In this embodiment, the mating surfaces of the lower cylinder assembly 12 and the upper cylinder assembly 13 adopt an annular sealing design. Specifically, the top surface of the lower cylinder assembly 12 is provided with an annular groove 32, and a matching annular sealing ring 31 is embedded inside the annular groove 32. Anti-detachment protrusions are added to the inner sidewall of the annular groove 32 to prevent the annular sealing ring 31 from shifting. The connecting device 14 includes locking buckles 141 symmetrically arranged between the mating surfaces of the lower cylinder assembly 12 and the upper cylinder assembly 13. The locking buckles 141 consist of a card seat fixed to the outer sidewall of the upper cylinder assembly 13 and a hook installed on the outer sidewall of the lower cylinder assembly 12. The hook can rotate around a fixed axis. When locked, the hook and the card seat engage with each other. The two sets of locking buckles 141 lock simultaneously to ensure that the mating surfaces of the upper and lower components are evenly stressed, thereby enhancing the sealing effect.

[0040] In this embodiment, the gas source control module ensures gas supply quality through multi-stage processing. Specifically, the gas source control module includes an air compressor, a pressure buffer tank, and a PID controller. The air source control module uses the air compressor as the starting point for the gas source. Compressed gas is delivered to the pressure buffer tank through a pressure-resistant pipeline. An airflow distribution plate is installed inside the pressure buffer tank to reduce the impact of airflow pulsation on pressure stability. The outlet of the buffer tank is connected in sequence to a filter and a pressure regulating component. The filter adopts a split-shell design, and its internal filter element can be independently disassembled and replaced, facilitating regular cleaning and maintenance to keep the gas clean. The pressure regulating component and the PID controller form a closed-loop control. By monitoring the output gas pressure in real time and feeding back the status of the regulating valve, the gas supply pressure is dynamically maintained to ensure stability, providing a continuous and reliable gas pressure environment for the detection process and reducing the interference of gas source fluctuations on detection accuracy.

[0041] In this embodiment, a muffler is connected to the end of the exhaust circuit 17 of the base housing 11. The muffler adopts a cylindrical split shell and is conveniently disassembled and maintained through threaded connection. Inside the muffler, a guide grille, a porous sound-absorbing layer and a resonant cavity are arranged in sequence along the airflow path. The guide grille guides the airflow smoothly into the muffler to avoid turbulence generating additional noise.

[0042] In this embodiment, the lower cylinder assembly 12 adopts a split transparent structure to improve practicality. Specifically, the lower cylinder assembly 12 consists of a coaxially arranged lower middle cylinder 123 and a transparent lower cylinder body 124. The lower middle cylinder 123 is connected to the top center of the base box 11. The transparent lower cylinder body 124 is fitted on the outside of the lower middle cylinder 123 and is made of a high light transmittance material, which facilitates intuitive observation of the state changes of the bottom of the bed sheet during waterproof testing. The bottom end of the transparent lower cylinder body 124 is connected to the base box 11 through an annular flange. The annular flange surface is designed with positioning and sealing structures to ensure installation accuracy and bottom sealing. The annular flange has a uniformly distributed fastening structure around its circumference, which not only ensures connection strength and sealing, but also allows for easy disassembly to clean the internal cavity, taking into account both practicality and maintenance convenience.

[0043] In this embodiment, the upper cylinder assembly 13 includes a transparent upper cylinder body 135 and a partition module 136. The partition module 136 includes a sealing top cover 1361, an upper middle cylinder 1362, and radial partitions 1363. The sealing top cover 1361 covers the top of the transparent upper cylinder body 135. The edge of the sealing top cover 1361 is sealed by a circumferentially distributed pressing structure. The sealing top cover 1361 is provided with a water inlet 1 that communicates with the fan-shaped cavity 132. 3611, equipped with a sealing cover 13612 to ensure sealing; the upper middle cylinder 1362 is vertically fixed to the center of the bottom surface of the top cover, and the radial partitions 1363 are evenly distributed along the circumference of the central cylinder, and the bottom end of the radial partitions 1363 extends to near the bottom of the cylinder; the inner wall of the transparent cylinder is provided with a slot 1351 that matches the partition, and the entrance of the slot 1351 is provided with a guide rounded corner. After assembly, the radial partitions 1363 and the inner wall of the slot 1351 fit tightly to form a fan-shaped cavity 132.

[0044] In this embodiment, the intelligent control unit includes a mode switching module, a data analysis module, and a visualization interface. The mode switching module connects to each electromagnetic regulating valve 18 via a relay assembly, enabling rapid switching between pipeline on / off states and one-click switching between air permeability and waterproofness testing modes, eliminating the need for manual valve operation. The data analysis module connects to each sensor via a data acquisition assembly, and the acquired data is transmitted to the main controller via a high-speed communication link. It processes the air pressure change curves in real time and calculates performance indicators. The visualization interface is integrated into the device control panel, featuring an intuitive operation design. It can display test data, dynamic curves, and the final report in real time, allowing operators to monitor the testing status throughout the process and simplifying the operation procedure.

[0045] The present invention also provides a testing method for a waterproof and breathable bed sheet testing device, comprising the following steps: Step 1: Sample pretreatment and clamping. Lay the bed sheet sample flat on the top of the lower cylinder assembly 12 to ensure that the sample covers all the detection areas. Connect and seal the upper cylinder assembly 13 and the lower cylinder assembly 12 through the connecting device 14. Inject liquid into the fan-shaped cavity 132 of the upper cylinder assembly 13 until it completely covers the corresponding area of ​​the sample. Let it stand for a preset time to remove air bubbles. Step 2: Air permeability testing process. The intelligent control unit closes the first air supply line 15 and opens the second air supply line 16 and exhaust circuit 17 through the mode switching module. The air source control module introduces the test gas into the lower annular cavity 122 through the second air supply line 16. The first sensor 21, the second sensor 22 and the third sensor 23 of the dynamic air pressure monitoring system collect the air pressure data of the fan-shaped cavity 132, the upper central cavity 131 and the lower central cavity 121 in real time, and simultaneously observe the distribution of bubbles in the liquid in the fan-shaped cavity 132. The intelligent control unit calculates the air permeability performance index based on the air pressure change curve and bubble distribution information. Step 3: Waterproofing test process. After completing the breathability test, the intelligent control unit closes the second gas supply line 16 and the exhaust circuit 17 through the mode switching module, and opens the first gas supply line 15. The gas source control module introduces test gas into the lower central cavity 121 through the first gas supply line 15. After the gas pressure stabilizes, observe whether there is any leakage at the bottom of the sample. The third sensor 23 continuously monitors the gas pressure stability of the lower central cavity 121. The data analysis module combines the gas pressure data and the leakage observation results to determine the waterproofing performance index. Step 4: Data integration and output. The intelligent control unit integrates and analyzes the multi-dimensional data obtained from the breathability and waterproofness tests, and outputs a test report containing data such as breathability, breathability uniformity, and waterproof pressure threshold through a visual interface.

[0046] In this embodiment, the preset settling time in step one is 3-10 minutes, the injected liquid is deionized water or test liquid that matches the detection standard, and the liquid injection volume is such that it completely covers the bottom of the fan-shaped cavity 132 without overflowing.

[0047] In this embodiment, in the air permeability detection process described in step two, the air source control module outputs a stable constant pressure gas. The air pressure value is preset according to the detection standard. The sampling frequency of the first sensor 21 for the air pressure of each sector cavity 132 is consistent with that of the second sensor 22 and the third sensor 23. The bubble distribution state is recorded by an image acquisition device or by manual observation.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A waterproof and breathable bed sheet testing device, characterized in that, include: The detection chamber mechanism (1) includes a lower cylinder assembly (12) and an upper cylinder assembly (13) capable of docking and sealing the bed sheet sample. The lower cylinder assembly (12) forms an independent lower central cavity (121) and a lower annular cavity (122). The upper cylinder assembly (13) forms an upper central cavity (131) corresponding to the lower central cavity (121) and multiple fan-shaped cavities (132) corresponding to the lower annular cavity (122). Each fan-shaped cavity (132) is connected to the top of the upper central cavity (131) through a through hole (134). The dynamic air pressure monitoring system includes sensors for detecting air pressure in the upper central cavity (131), the sector cavity (132) and the lower central cavity (121); The gas source control module is selectively connected to the lower central cavity (121) or the lower annular cavity (122) to provide detection gas; The intelligent control unit is connected to the air pressure sensor and the air source control module. By switching the air supply to the lower central cavity (121) or the lower annular cavity (122), it can realize the continuous detection of the waterproofness and air permeability of the bed sheet sample.

2. The detection device according to claim 1, characterized in that, The detection chamber mechanism (1) also includes a base box (11), the lower cylinder assembly (12) is detachably installed on the top of the base box (11), and the upper cylinder assembly (13) is detachably installed on the top of the lower cylinder assembly (12) through a connecting device (14); the bottom of the adjacent fan-shaped cavity (132) is provided with a connecting gap (133).

3. The detection device according to claim 2, characterized in that, The base housing (11) is provided with a first gas supply pipeline (15) and an exhaust circuit (17) connected to the lower central cavity (121), and a second gas supply pipeline (16) connected to the lower annular cavity (122). The first gas supply pipeline (15), the second gas supply pipeline (16) and the exhaust circuit (17) are all equipped with electromagnetic regulating valves (18). The intelligent control unit realizes the switching of pipeline on and off by controlling the electromagnetic regulating valves (18).

4. The detection device according to claim 2, characterized in that, The mating surfaces of the lower cylinder assembly (12) and the upper cylinder assembly (13) are provided with a sealing structure. The sealing structure includes an annular groove (32) and an annular sealing ring (31) embedded in the annular groove (32). The inner sidewall of the annular groove (32) is provided with an anti-detachment protrusion. The connecting device (14) includes symmetrically arranged locking buckles (141).

5. The detection device according to claim 2, characterized in that, The dynamic air pressure monitoring system includes a first sensor (21) for detecting the air pressure of the sector cavity (132), a second sensor (22) for detecting the air pressure of the upper central cavity (131), and a third sensor (23) for detecting the air pressure of the lower central cavity (121).

6. The detection device according to claim 1, characterized in that, The air source control module includes an air compressor, a pressure buffer tank, and a PID controller. The pressure buffer tank is equipped with an airflow distribution plate. A filter and a pressure regulating component are connected in series at the outlet of the pressure buffer tank. The PID controller realizes dynamic adjustment of the air supply pressure through closed-loop control. The intelligent control unit is connected to and controls the PID controller.

7. The detection device according to claim 2, characterized in that, The lower cylinder assembly (12) includes a lower middle cylinder (123) and a transparent lower cylinder body (124) arranged coaxially; the upper cylinder assembly (13) includes a transparent upper cylinder body (135) and a partition module (136). The partition module (136) includes a sealing top cover (1361), an upper middle cylinder (1362) and a radial partition (1363). The radial partition (1363) cooperates with the inner wall groove (1351) of the transparent upper cylinder body (135) to form a fan-shaped cavity (132).

8. A method for testing waterproof and breathable bed sheets based on the device described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Seal and clamp the bed sheet sample between the lower cylinder assembly (12) and the upper cylinder assembly (13), inject liquid into the fan-shaped cavity (132) of the upper cylinder assembly (13) to cover the corresponding area of ​​the sample, and let it stand for a preset time to remove air bubbles; Step 2: The gas source control module introduces the detection gas into the lower annular cavity (122). The dynamic air pressure monitoring system collects the air pressure data of the fan-shaped cavity (132), the upper central cavity (131) and the lower central cavity (121). The air permeability index is calculated by combining the distribution state of the bubbles in the fan-shaped cavity (132). Step 3: The intelligent control unit switches the gas supply channel and introduces detection gas into the lower central cavity (121) through the gas source regulation module. The gas pressure stability of the lower central cavity (121) is monitored, and the waterproof performance index is determined by combining the sample leakage observation results. Step 4: The intelligent control unit integrates the data and outputs a test report that includes air permeability, air permeability uniformity, and waterproof pressure threshold.

9. The detection method according to claim 8, characterized in that, The settling time in step one is 3-10 minutes, and the injected liquid is deionized water or a test liquid that matches the detection standard.

10. The detection method according to claim 8, characterized in that, The gas to be detected in step two is a constant-pressure gas, with the pressure value preset according to the detection standard, and the acquisition frequency of each sensor is kept consistent; the distribution state of the bubbles is recorded by an image acquisition device or manually.

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