Air pressure compensation control system and method for powered air supply filtering respirator

Abstract

An air pressure compensation control system and method for a powered air supply filtering respirator, comprising: a main unit (1) and a battery pack (2); a waterproof breathable membrane (3) is mounted on a through hole in a housing of the main unit or the battery pack; an acquisition module is arranged in a cavity of the main unit or the battery pack, and a conversion module, a comparison module, and a control module are arranged in the cavity of the main unit; the acquisition module detects the actual atmospheric pressure in real time; the conversion module receives the external actual atmospheric pressure and converts same into an electrical signal; the comparison module receives the electrical signal, calculates a specific numerical value of the atmospheric pressure, compares same with the standard air pressure of the laboratory, and outputs an air pressure difference value; and the control module dynamically adjusts the rotation speed of a fan (6) in real time according to the air pressure difference value, in order to control the respirator to keep the internal and external pressure difference constant under different environmental conditions, providing customers with a continuous and stable air output, and effectively guaranteeing the normal operation of the respirator and safety of the user.

Description

Air pressure compensation control system and method for powered air-purifying respirator Technical Field

[0001] The present invention relates to the technical field of respirators, and in particular to an air pressure compensation control system and method for a powered air-filtering respirator. Background Art

[0002] The most important function of a powered air-purifying respirator (PAPR) is to generate negative pressure at the air inlet of the volute through the rotation of the impeller of the high-pressure separation blower, which will form an air pressure difference with the air outside the product filter element. This air pressure difference will push the air into the filter element, and the filter element will filter out pollutants in the air, and finally provide clean air to the user for breathing.

[0003] However, the air pressure outside the filter element of the above-mentioned product is affected by altitude, temperature and humidity. When the speed of the high-pressure release blower remains unchanged, the actual atmospheric pressure outside continues to change, which will cause the air pressure difference to fluctuate, easily causing discontinuous air supply and unstable air supply volume, making it difficult to ensure the user's respiratory protection safety. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an air pressure compensation control system and method for a powered air-purifying respirator, which effectively solves the problems in the background technology.

[0005] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: an air pressure compensation control system and method for a powered air-purifying respirator, comprising: a host and a battery pack;

[0006] At least one through hole is provided on the housing of the host or the battery pack, and a waterproof and breathable membrane is installed on the through hole;

[0007] Wherein, an acquisition module is provided inside the cavity of the host or the battery pack, and a conversion module, a comparison module and a control module are provided inside the cavity of the host;

[0008] The acquisition module detects the actual external atmospheric pressure in real time;

[0009] The conversion module receives the actual external atmospheric pressure and converts the pressure signal into an electrical signal;

[0010] The comparison module receives the electrical signal, calculates the specific value of the atmospheric pressure under the current environmental conditions, and compares the calculated current atmospheric pressure with the laboratory standard atmospheric pressure, thereby outputting the pressure difference;

[0011] The control module dynamically adjusts the speed of the fan in real time according to the air pressure difference, so as to control the respirator to maintain a constant internal and external pressure difference under different environmental conditions.

[0012] Furthermore, a power supply circuit is provided in the host, and the power supply circuit is connected to the battery pack, and is used to adjust the output voltage of the battery pack to a suitable value to supply power to each module.

[0013] Furthermore, the electrical signal includes an analog signal, a digital signal, or a communication signal.

[0014] Furthermore, a motor drive circuit is provided in the control module, and the single chip microcomputer in the host uses the motor drive circuit to adjust the fan speed in real time.

[0015] Furthermore, the acquisition module includes one or more air pressure sensors installed in the battery pack cavity or the host cavity.

[0016] Furthermore, a conditioning circuit is provided in the conversion module, and the conditioning circuit is used to convert the air pressure signal into an electrical signal.

[0017] Furthermore, the conditioning circuit is integrated on the acquisition module.

[0018] The present invention also provides a method for controlling an air pressure compensation control system of a powered air-purifying respirator, comprising the following steps:

[0019] Control the air pressure sensor to obtain the actual atmospheric pressure of the external environment in real time;

[0020] The acquired atmospheric pressure signal is converted through a conditioning circuit to obtain a corresponding electrical signal;

[0021] Based on the converted electrical signal, the specific value of the atmospheric pressure under the current conditions is calculated, and the calculated current atmospheric pressure is compared with the laboratory standard pressure to output the pressure difference;

[0022] The single chip microcomputer dynamically adjusts the fan speed in real time according to the air pressure difference to control the respirator to maintain a constant internal and external pressure difference under different environmental conditions.

[0023] Furthermore, the single chip microcomputer in the host controls the drive motor through a PID algorithm to control the fan speed.

[0024] Furthermore, the absolute value of the pressure difference is compared with the set pressure difference threshold to obtain the fan speed control target, and the fan speed is dynamically adjusted in real time based on the fan speed control target and the current pressure compensation state in the respirator.

[0025] The beneficial effects of the present invention are as follows: the present invention adjusts and changes the speed of the current brushless motor (fan) by detecting the change in the current atmospheric pressure, further adapts to the current atmospheric pressure environment, and overcomes the resistance of the filter (filter element), thereby always being able to provide customers with a continuous and stable air output, effectively ensuring the normal operation of the respirator and the safety of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] FIG1 is a flow chart of a method for controlling air pressure compensation of a powered air-purifying respirator;

[0028] FIG2 is a framework diagram of an air pressure compensation control system of a powered air-purifying respirator;

[0029] Figure 3 is a functional schematic diagram of a powered air-purifying respirator;

[0030] Figure 4 is a diagram showing the working principle of the host control system.

[0031] Figure numerals: 1. host; 2. battery pack; 3. waterproof and breathable membrane; 4. power supply circuit; 5. motor drive circuit; 6. fan; 7. single-chip microcomputer; 8. air pressure sensor; 9. conditioning circuit; 10. filter. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The present invention provides an air pressure compensation control system for a powered air-purifying respirator, comprising a host 1 and a battery pack 2;

[0036] At least one through-hole is provided on the housing of the host 1 or the battery pack 2, and a waterproof and breathable membrane 3 is mounted on the through-hole. As shown in Figures 2 and 3, an acquisition module is provided inside the cavity of the host 1 or the battery pack 2, and a conversion module, a comparison module, and a control module are provided inside the cavity of the host 1.

[0037] The acquisition module detects the actual external atmospheric pressure in real time;

[0038] The conversion module receives the actual external atmospheric pressure and converts the pressure signal into an electrical signal; in the present invention, the electrical signal includes an analog signal, a digital signal or a communication signal.

[0039] The comparison module receives the electrical signal, calculates the specific value of the atmospheric pressure under the current environmental conditions, and compares the calculated current atmospheric pressure with the laboratory standard pressure to output the pressure difference;

[0040] The control module dynamically adjusts the speed of the fan 6 in real time according to the pressure difference, so as to control the respirator to maintain a constant internal and external pressure difference under different environmental conditions.

[0041] In the present invention, a waterproof and breathable membrane 3 is set on the housing of the host 1 or the battery pack 2, which can effectively prevent moisture and other impurities from entering the interior of the device while allowing air circulation, so as to achieve the purpose of the acquisition module detecting the atmospheric pressure of the use environment. The acquisition module is set in both the host 1 and the battery pack 2, which can accurately obtain the pressure information of the external environment, ensure the reliability of the detection data, convert the acquired external atmospheric pressure into an electrical signal, which is easier to process and transmit, and facilitates subsequent calculation and control. The electrical signal is then converted back into a specific value of atmospheric pressure so that it can be compared with the laboratory standard atmospheric pressure, thereby more accurately understanding the current atmospheric pressure situation, making it possible to dynamically adjust the speed of the fan 6 in real time, further ensuring that the respirator maintains the internal and external pressure difference within a suitable range under different environments, so that the air output of the respirator is constant. The present invention adjusts the speed of the current brushless motor (fan 6) by detecting the change in the current atmospheric pressure, further adapts to the current atmospheric pressure environment, and overcomes the resistance of the filter 10 (filter element), so that it can always provide customers with a continuous and stable air output, effectively ensuring the normal operation of the respirator and the safety of the user.

[0042] In a preferred embodiment of the present invention, a power supply circuit 4 is provided within the host computer 1. This circuit is connected to the battery pack 2 and is used to adjust the output voltage of the battery pack 2 to an appropriate value to power each module. This design ensures that each module receives a stable and appropriate voltage supply, thereby ensuring the normal operation of the entire system. By adjusting the output voltage of the battery pack 2, the voltage requirements of different modules can be met, while effectively protecting each module from unstable or excessive voltage, extending the device's service life and improving system reliability and stability.

[0043] As a preferred real-time method, a motor drive circuit 5 is provided within the control module, and a single-chip microcomputer 7 within the host computer 1 uses the motor drive circuit 5 to adjust the speed of the fan 6 in real time. By adjusting the speed of the fan 6 in real time to compensate for atmospheric pressure changes, a constant internal and external pressure differential can be more accurately maintained, preserving the normal function of the respirator. For example, when using the respirator at high altitudes, the speed of the fan 6 can be adjusted in advance based on the low air pressure at high altitudes to ensure normal operation of the respirator. Through the control of the single-chip microcomputer 7, the respirator can be automatically controlled and the speed of the fan 6 can be automatically adjusted according to preset parameters and environmental conditions to provide optimal ventilation.

[0044] In a preferred embodiment of the present invention, the acquisition module includes one or more air pressure sensors 8 installed within the cavity of the battery pack 2 or the cavity of the main unit 1. Combining the air pressure sensors 8 with the control module and motor drive circuit 5 enables automated control of the respirator. By acquiring real-time air pressure data and performing automatic compensation, the user's operational burden can be reduced and the respirator can always be kept in optimal working condition.

[0045] As a preferred embodiment of the above embodiment, a conditioning circuit 9 is provided within the conversion module. This circuit is used to convert the air pressure signal into an electrical signal. First, the conditioning circuit 9 amplifies the collected air pressure signal to increase its amplitude and range, making it easier to measure and process. Second, a filter is applied to remove noise, spurious signals, and other unnecessary frequency components from the signal to improve its accuracy and stability. The conditioning circuit 9 also converts the nonlinear output signal of the air pressure sensor 8 into a linear response, facilitating subsequent processing and calculation. Finally, the conditioning circuit 9 rectifies the signal (e.g., full-wave or half-wave rectification) and selects an appropriate sampling method to obtain a stable and reliable electrical signal. The conditioning circuit 9 of the present invention converts the air pressure signal into an electrical signal through amplification, filtering, and linearization, providing a signal that is compatible with subsequent systems and offers the advantages of signal enhancement, noise removal, and adaptability. This ensures the accuracy and reliability of the air pressure signal, providing a reliable foundation for subsequent data processing and control.

[0046] A preferred embodiment is to integrate the conditioning circuit 9 into the acquisition module. By tightly integrating the conditioning circuit 9 with the sensor, the impact of external electromagnetic interference on the signal can be reduced, the anti-interference ability of the acquisition module can be improved, and the accuracy and stability of the signal can be guaranteed.

[0047] As shown in FIG1 , the present invention also provides a method for controlling an air pressure compensation control system of a powered air-purifying respirator, comprising the following steps:

[0048] Control the air pressure sensor 8 to obtain the actual atmospheric pressure of the external environment in real time;

[0049] The acquired atmospheric pressure signal is converted by the conditioning circuit 9 to obtain a corresponding electrical signal;

[0050] Based on the converted electrical signal, the specific value of the atmospheric pressure under the current conditions is calculated, and the calculated current atmospheric pressure is compared with the laboratory standard pressure to output the pressure difference;

[0051] According to the pressure difference, the rotation speed of the fan 6 is dynamically adjusted in real time to control the respirator to maintain a constant internal and external pressure difference under different environmental conditions.

[0052] The air pressure compensation control method in this embodiment can obtain the actual atmospheric pressure of the external environment in real time, and calculate and compare the air pressure difference according to the air pressure changes under different environmental conditions, so as to automatically adjust the speed of the fan 6 in time. When the air pressure difference increases, the single-chip microcomputer 7 increases the speed of the fan 6; when the air pressure difference decreases, the single-chip microcomputer 7 reduces the speed of the fan 6; through real-time monitoring and adjustment, and using the single-chip microcomputer 7 for control, the automatic adjustment of the speed of the fan 6 can be achieved, ensuring that the respirator always maintains a normal internal and external pressure difference under different environmental conditions, thereby improving the stability and reliability of the system.

[0053] During the real-time process, the single-chip microcomputer 7 in the host computer 1 controls the drive motor using the PID algorithm to control the speed of the fan 6. The PID algorithm can achieve stable control effects under different operating conditions and can better cope with changes in system parameters and external interference, making the system more stable. The PID control algorithm also has a good response speed and can quickly adjust the control output to achieve rapid tracking and adjustment of the system, making it suitable for control scenarios with high real-time requirements.

[0054] [Corrected 11.12.2024 according to Rule 91] As a more specific approach, as shown in FIG4 , the single-chip computer 7 compares the absolute value of the pressure difference with the set pressure difference threshold to obtain the speed control target of the fan 6. Based on the speed control target of the fan 6 and the current pressure compensation state in the ventilator, the speed of the fan 6 is dynamically adjusted in real time.

[0055] Specifically, the absolute value of the pressure difference calculated in the control method is compared with a set pressure difference threshold to determine whether the current pressure compensation within the ventilator meets the requirements. If the pressure difference exceeds the set pressure difference threshold, it indicates that the pressure difference between the inside and outside of the ventilator exceeds the expected value under the current environment. The required speed control target of fan 6 is calculated based on the portion exceeding the expected value. Further determination is made as to whether the pressure in the ventilator needs to be increased or decreased in the current state, thereby further adjusting the speed of fan 6 to control the air supply volume to maintain a constant pressure difference between the inside and outside of the ventilator. Dynamically adjusting the speed of fan 6 based on the speed control target of fan 6 can achieve the ventilator's adaptive pressure compensation function, ensuring that the ventilator can operate stably under different environmental conditions and guaranteeing the comfort and safety of the user.

[0056] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure compensation control system for a powered air-purifying respirator, characterized in that: Includes: host and battery pack; At least one through hole is provided on the housing of the host or the battery pack, and a waterproof and breathable membrane is installed on the through hole; Wherein, a collection module is provided inside the cavity of the host or the battery pack, and a conversion module, a comparison module and a control module are provided inside the cavity of the host; The acquisition module detects the actual external atmospheric pressure in real time; The conversion module receives the actual external atmospheric pressure and converts the atmospheric pressure signal into an electrical signal; The comparison module receives the electrical signal, calculates the specific value of the atmospheric pressure under the current environmental conditions, and compares the calculated current atmospheric pressure with the laboratory standard atmospheric pressure, thereby outputting the pressure difference; The control module dynamically adjusts the speed of the fan in real time according to the pressure difference, so as to control the respirator to maintain a constant internal and external pressure difference under different environmental conditions; A motor drive circuit is provided in the control module, and the single chip microcomputer in the host uses the motor drive circuit to adjust the fan speed in real time, and can automatically adjust the fan speed according to preset parameters and environmental conditions; The acquisition module includes one or more air pressure sensors installed in the battery pack cavity or the main unit cavity. Combining the air pressure sensor with the control module and the motor drive circuit can realize automatic control of the respirator by acquiring air pressure data in real time and performing automatic compensation.

2. The air pressure compensation control system of the powered air-purifying respirator according to claim 1, characterized in that: A power supply circuit is provided in the host, and the power supply circuit is connected to the battery pack and is used to adjust the output voltage of the battery pack to a suitable value so as to supply power to each module.

3. The air pressure compensation control system of the powered air-purifying respirator according to claim 1, characterized in that: The electrical signal includes an analog signal, a digital signal or a communication signal.

4. The air pressure compensation control system of the powered air-purifying respirator according to claim 1, characterized in that: The conversion module is provided with a conditioning circuit, and the conditioning circuit is used to convert the air pressure signal into an electrical signal.

5. The air pressure compensation control system of the powered air-purifying respirator according to claim 4, characterized in that: The conditioning circuit is integrated on the acquisition module.

6. A control method for an air pressure compensation control system of a powered air-purifying respirator as claimed in claim 1, characterized in that: The following steps are involved: Control the air pressure sensor to obtain the actual atmospheric pressure of the external environment in real time; The acquired atmospheric pressure signal is converted by a conditioning circuit to obtain a corresponding electrical signal; Based on the converted electrical signal, the specific value of the atmospheric pressure under the current conditions is calculated, and the calculated current atmospheric pressure is compared with the laboratory standard atmospheric pressure to output the pressure difference; According to the air pressure difference, the fan speed is dynamically adjusted in real time to control the respirator to maintain a constant internal and external pressure difference under different environmental conditions.

7. The control method of the air pressure compensation control system of the powered air-purifying respirator according to claim 6, characterized in that: The single chip microcomputer in the host controls the driving motor through the PID algorithm to control the speed of the fan.

8. The control method of the air pressure compensation control system of the powered air-purifying respirator according to claim 6, characterized in that: The absolute value of the pressure difference is compared with the set pressure difference threshold to obtain the fan speed control target, and the fan speed is dynamically adjusted in real time according to the fan speed control target and the current air pressure compensation state in the respirator.

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