TH23630Y - Medical mask testing equipment - Google Patents

Abstract

------10/03/2566------(OCR) The medical mask testing machine consists of three main testing systems: the exhaust valve leakage test system, the inhalation/exhalation resistance test system, and the differential pressure test system. The testing procedure begins by securely clamping the test specimen with steel plates and rubber seals to prevent air leakage. Then, the control panel is switched on, the desired test mode is selected, the electrical equipment in the selected system activates, and the testing begins. Airflow in the system is controlled using valves, which are manually adjusted for opening and closing. Flow rate is measured using float and bubble flow meters, and total system pressure is measured using a manometer. Data loggers record temperature and humidity throughout the testing process. All measurements are read manually. The testing phase then begins. Air flow control in the system utilizes valves, manually adjusted for on/off positions. Flow rate measurements are taken using float and bubble flow meters, and overall system pressure is measured using a manometer. Data loggers record temperature and humidity throughout the testing period for all systems. All readings from the measuring instruments are manually read.

Claims (1)

------10/03/2023------(OCR) 1. Medical mask testing machine consists of a testing frame (4) which is a rectangular metal box attached to a device for measuring pressure and flow rate, of the type that relies on mechanical changes, with a cover on top with a handle. One side of the outside is a steel plate with 5 rubber seals (1). The other side of the testing frame is connected to an air pump (3) and inside there is a vacuum pump (2) with silicone tubing for sending air to each device. Inside, it is divided into 3 parts: Part 1 tests for leakage of the vent valve. There is a vacuum pump (2) that sends suction into the system and there is a valve block 1 (7) that helps increase the suction in the system, a vacuum bottle (5) that holds the air, and a supply valve 1 (6) that cuts off the suction within the system. There is a valve block 2 (8) that cuts off to check for leakage in the system at the beginning, a valve block 3 (9) that cuts off to check for leakage in the system in the middle, and a valve block 4 (10) that cuts off to check for leakage in the system at the end. There is a U-shaped manometer (1 1) which measures the pressure in the system at the beginning, middle, and end, and a bubble air flow calibration instrument (12) which measures the rate of air leakage through the mask's exhalation valve. Part 2: Breathing Resistance Test. There is a vacuum pump (2) which provides suction to the system for breathing resistance testing. There is an air pump (3) which provides compressed air to the system for breathing resistance testing. There are supply valves 2 (14) and 3 (18) which control the suction and compression within the system. A float flow meter 1 (15) measures the rate of air flow within the system. And single-tube manometer 1(16) and single-tube manometer 2 (19) are used to measure the inhalation and exhalation resistance values. Block valve 5 (13) and block valve 6 (17) are used to release and retain air before and after the inhalation and exhalation resistance tests. Part 3: Pressure Difference Test. An air pump (3) is used to pressurize the air into the system. A float flow meter 2 (20) is used to measure the air flow rate within the system. A single-tube manometer 1 (21) is used to measure the air pressure before it flows through the disposable face mask. A U-shaped manometer 2 (22) is used to measure the air pressure after it flows through the disposable face mask. Block valve 7 (23) is used to release any remaining air within the system. And the vacuum pump (2) is responsible for drawing air out of the system in the event that the block valve 7 (23) is opened and the air has not been completely expelled from the system. It has a special characteristic: a steel plate is attached to the rubber seal (1), which is a hollow steel flange shaped according to the shape of the mask valve, secured with a set of locking nuts (24), which is responsible for holding the mask's air vent valve while testing all three parts. There is a control cabinet (25) with 4 push buttons, 3 of which control the opening and closing of the three parts of the test. When the button is pressed the first time, the power device in the system will start working. When the button is pressed the second time, the power device in the system will stop working. And the 4th button is used for emergency shutdown (26). And the device for measuring pressure and flow rate is of the type based on mechanical changes. Float flow meter 1(15), Float flow meter 2 (20), Bubble air flow calibrator (12), Single tube manometer 1 (16), Single tube manometer 2 (19), U-shaped manometer 1(21), U-shaped manometer 2 (22) can be removed for calibration and reassembled and use a data logger (27) installed near the control cabinet (25) to record temperature and humidity values.2. Medical mask tester according to claim 1 in which a steel plate encloses a rubber seal (1) to hold various types and shapes of masks and valves.3. Medical mask tester according to claim 1 in which a data logger (27) is used to record temperature and humidity values throughout the test period. ------------ 1. The medical mask testing machine is a rectangular metal box with a lid on top and a handle. Inside the single testing machine are three testing systems. All three testing systems use the same interchangeable mask clamp set, which is a steel plate with a rubber seal (1), and use the same power source, which is a vacuum pump (2) and an air pump (3), using silicone tubing to deliver air to each device in the system. The devices for measuring pressure and flow rate are of the mechanical change type in all three testing systems and are attached to the testing machine frame (4). The first testing system is the exhaust valve leak testing system, which uses the method of sucking air inside the system to force open the exhaust valve of the medical N95 mask with pressure, and then measuring the leakage rate. The devices in the first testing system consist of a vacuum pump (2) which sends suction into the system and a valve block 1 (7) which helps to increase the suction in the system, a vacuum bottle (5) which holds the air, and a supply valve 1 (6) which controls the suction within the system. Block valve 2 (8) is used to cut off and check for leaks in the upstream system. Block valve 3 (9) is used to cut off and check for leaks in the midstream system. Block valve 4 (10) is used to cut off and check for leaks in the downstream system. The U-shaped manometer (11) measures the pressure in the upstream, midstream, and downstream systems. If the system is not leaking, the suction force is sent to the exhaust valve of the medical N95 mask and forces the exhaust valve of the medical N95 mask to open at the specified pressure. A bubble air flow rate calibrator (12) measures the air leakage rate through the exhaust valve of the medical N95 mask. The steel plate enclosing the rubber seal (1) holds the exhaust valve of the medical N95 mask during testing. The second test system is the respiratory resistance test system, which tests by suction and supplying air within the system, with the flow rate controlled through the medical N95 mask, and then measuring the respiratory resistance of the medical N95 mask using the equipment in the test system. The second system consists of a vacuum pump (2) which draws air into the system for the inhalation resistance test, an air pump (3) which compresses air into the system for the exhalation resistance test, with supply valves 2 (14) and 3 (18) controlling the flow of air and pressure within the system, and a float flow meter 1 (15) which measures the air flow rate within the system. The same set is used for both the inhalation and exhalation resistance tests. A single-tube manometer 1 (16) and a single-tube manometer 2 (19) measure the inhalation and exhalation resistance, respectively. A steel plate with a rubber seal (1) holds the exhalation valve of the medical N95 mask during testing. Valve block 5 (13) and valve block 6 (17) release and retain air before and after the inhalation and exhalation resistance tests, respectively. The third system is the pressure difference testing system. The test is performed by supplying air within the system through a disposable face mask under a specified pressure area, then measuring the pressure before and after passing through the disposable face mask and finding the pressure difference. The equipment in the third test system consists of an air pump (3) which supplies compressed air to the system, a float flow meter 2 (20) which measures the air flow rate within the system, a U-shaped manometer 1 (21) which measures the air pressure before flowing through the disposable face mask, a steel plate with a rubber seal (1) which holds the disposable face mask, a U-shaped manometer 2 (22) which measures the air pressure after flowing through the disposable face mask, a block valve 7 (23) which releases any remaining air in the system, and a vacuum pump (2) which removes air from the system in case the block valve 7 (23) is opened but the air is not completely removed from the system. A special feature is that the medical mask testing machine has two main operating steps: - The sample clamping step, starting by loosening the locking nut set (24) and inserting the test piece. Insert between the steel plates and the rubber seal (1), which is a hollow steel flange shaped according to the characteristics of the valve or mask. Then tighten the locking nut set (24) back to its original position. This method of fastening prevents air leakage at the fastening device and can fasten many types and shapes of masks and valves. - Testing procedure: Press the button on the control panel (25) to control the opening and closing of the electrical equipment in the system to be tested. Pressing the button once will start the power supply in that system. Pressing the button a second time will stop the power supply in that test system. There are 3 buttons according to the number of electrical equipment in the system, and there is also an emergency shut-off button (26). Combining the 3 testing systems into the same testing machine and using the same control panel (25) makes it easy to use, reduces the cost of the testing machine, and makes the machine lighter. During testing, the pressure and flow rate measuring devices are of the mechanical change type in all 3 testing systems, which is suitable for measuring air with low pressure and flow rate, increasing the accuracy of the test. This can measure the air flow rate in the respiratory resistance testing system. With a float flow gauge 1 (15) and measuring the air flow rate in the differential pressure test system with a float flow gauge 2 (20), the air flow rate in all three test systems can be controlled with different valves according to the required test conditions. In the case of measuring the leakage rate through the exhalation valve of the N95 mask, it is measured with a bubble air flow calibrator (12). In the case of measuring the inhalation resistance, it is measured with a single-tube manometer 1 (16). In the case of measuring the exhalation resistance, it is measured with a single-tube manometer 2 (19), and in the case of measuring the differential pressure, it is measured with a U-shaped manometer 1 (21) at the inlet and a U-shaped manometer 2 (22) at the outlet. The measured pressure values are then used to find the difference. This mechanical pressure and flow measurement device is easier to remove, send for calibration and reinstall than electronic ones, which saves time and opportunity in using the test instrument. In all test systems, a data logger (27) is used to record temperature and humidity values throughout the test period.