High-altitude air constant-pressure control box

Abstract

A kind of high-altitude gas constant pressure control box for high-altitude aircraft, keep electronic component air pressure balance, including shell, air inlet and air outlet, the air inlet and air outlet are arranged on the rear wall of shell, air tank is also arranged in the shell, the air path connection between air inlet and air tank, air pump is also arranged in the shell, air tank and air pump are connected by air path, the outlet of air pump and air outlet are connected by air path, by using the flow control of regulating air pump to control air inlet pressure, when sensor detects inaccurate air pressure, directly send adjusted signal to air pump, air pump rapidly adjusts flow to make air pressure stable at set value, under the premise of ensuring normal operation even better than original product, eliminate the use of electrical proportional valve, not only can avoid the pressure error caused by electrical proportional valve failure, but also can reduce product cost;Adopt key input, replace potentiometer adjustment set value, intuitive and accurate.

Description

Technical Field

[0001] This utility model relates to the field of gas constant pressure control boxes, and in particular to a high-altitude gas constant pressure control box. Background Technology

[0002] A high-altitude gas constant pressure control box is a device used to maintain stable gas pressure in high-altitude environments. It regulates gas pressure to ensure that the gas pressure inside equipment or a specific space remains stable at a set value, preventing pressure fluctuations from affecting normal equipment operation. Existing high-altitude gas constant pressure control boxes all use electro-proportional valves to control the inlet pressure and potentiometers to adjust the target gas pressure value. However, existing control boxes have the following problems:

[0003] When the sensor detects inaccurate air pressure, the circuit board adjusts the output voltage to control the electro-proportional valve, resulting in a relatively slow system response. Over time, the electro-proportional valve may experience zero-point drift or temperature drift due to mechanical wear and aging of the electromagnetic coil, requiring periodic calibration and increasing workload. Furthermore, the electro-proportional valve is sensitive to its operating environment; under strong vibration and impact, the internal structure may resonate or loosen, causing the valve core to shift and deteriorate in stability. Simultaneously, prolonged use of the potentiometer can lead to resistance shifts, resulting in errors in the set value and incorrect data. To address these issues, a high-altitude air constant pressure control box is proposed. Utility Model Content

[0004] The purpose of this invention is to solve the problems of slow response and inaccurate data in existing high-altitude gas control box systems.

[0005] The present invention adopts the following technical solution:

[0006] A high-altitude constant pressure control box is used in a high-altitude aircraft to maintain the air pressure balance of electronic components. It includes a housing, an air inlet, and an air outlet. The air inlet and air outlet are both located on the rear wall of the housing. An air storage tank is also provided inside the housing. The air inlet and the air storage tank are connected by an air passage. An air pump is also provided inside the housing. The air storage tank and the air pump are connected by an air passage. The outlet of the air pump is connected to the air outlet by an air passage.

[0007] Furthermore, a circuit board is also provided inside the housing. The circuit board is fixed inside the housing by screws. The circuit board has a pressure detection circuit and a pressure sensor. The air passage between the air inlet and the air tank is connected to the pressure sensor on the circuit board through a three-way pipe for detecting the air pressure at the air inlet.

[0008] Furthermore, the air passage at the air inlet passes through the air storage tank, where a three-way pipe extends into the air storage tank, and the other end of the three-way pipe is connected to the air pump.

[0009] Furthermore, the housing is also equipped with a pressure display module and a pressure setting module, both of which are installed on the front wall of the housing. The pressure setting module is a button type, which is fixed to the surface of the housing by screws and electrically connected to the circuit board for the user to input the target pressure value. The pressure display module is fixed to the surface of the housing by screws and electrically connected to the circuit board for real-time display of the pressure value in the air circuit.

[0010] Furthermore, the front of the housing is also provided with a toggle switch and a power indicator light. The toggle switch is fixed to the surface of the housing with screws and connected to the circuit board via electrical connection for switching the overall power on and off. The power indicator light is fixed to the surface of the housing with screws and connected to the circuit board via electrical connection for indicating the power status.

[0011] Furthermore, the rear wall of the housing is also provided with a power plug and a fuse. The power plug is electrically connected to the circuit board for connecting to an external power source, and the fuse is located between the external power source and the circuit board for circuit protection.

[0012] Furthermore, the circuit board is also equipped with a control circuit and a drive circuit for connecting with other electronic components. The control circuit uses a microprocessor with a built-in PID control algorithm, and the drive circuit uses a chip to output a PWM signal and is equipped with level conversion.

[0013] Furthermore, the housing is made of 6063-T5 aluminum alloy and has undergone sandblasting and oxidation treatment. The bottom of the housing has rubber feet for stable placement.

[0014] The beneficial effects of this utility model are:

[0015] By controlling the intake pressure using a variable air pump flow rate, when the sensor detects inaccurate air pressure, the adjusted signal is directly sent to the air pump, which quickly adjusts the flow rate to stabilize the air pressure at the set value. This eliminates the need for an electric proportional valve, ensuring normal operation and even outperforming previous products. This not only avoids pressure errors caused by electric proportional valve failures but also reduces product costs. The use of button input instead of a potentiometer to adjust the set value is intuitive and accurate.

[0016] By regulating the intake pressure solely through an air pump and adjusting it in real time according to changes in external pressure to achieve the set target air pressure value, the high-altitude constant air pressure control box can stably control the intake air pressure of the detection equipment in scenarios such as aircraft takeoff, effectively solving the problem of unstable air pressure and improving the accuracy and stability of the detection equipment in measuring particle concentration and quantity. Attached Figure Description

[0017] Figure 1A schematic diagram of the overall structure of a high-altitude constant pressure control box for utility models;

[0018] Figure 2 The rear view of a high-altitude constant pressure control box according to a utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of a high-altitude gas constant pressure control box according to a utility model.

[0020] In the diagram: 1. Housing; 2. Circuit board; 3. Air pump; 4. Air pressure display module; 5. Air pressure setting module; 6. Toggle switch; 7. Power indicator light; 8. Power plug; 9. Fuse; 10. Air inlet; 11. Air outlet; 12. Air tank. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Example 1

[0025] This utility model provides a high-altitude constant pressure control box for use in high-altitude aircraft to maintain the air pressure balance of electronic components. It includes a shell 1 that provides structural support and protection. An air inlet 10 and an air outlet 11 are provided on the rear wall of the shell 1. An external air source is connected to the air inlet 10 through a pipeline. The air inlet 10 is connected to an air storage tank 12 through an air pipeline for temporary storage and buffering of input gas to smooth pressure fluctuations. On the air pipeline between the air inlet 10 and the air storage tank 12, a detection air path is split off through a T-connector and connected to an air pressure detection circuit with a high-precision air pressure sensor on a circuit board 2 for real-time and accurate detection of the air pressure value of the input gas.

[0026] The air inlet 10 is connected to the equipment requiring constant pressure air supply via an external tee. There is also a throttling orifice in front of the tee, which is connected to the outside and used to allow gas to enter. The air path on the air inlet 10 passes through the air storage tank 12 and is inserted into the air storage tank 12 via a tee pipe. The other end of the tee pipe is connected to the air pump 3. The outlet of the air pump 3 is directly connected to the air outlet 11 through the final air path pipeline. The air pump is used to discharge the gas in the air path to the outside. The air pump is always in operation. All air path connections use high-performance sealing joints to ensure that no leakage occurs in high-altitude low-pressure and vibration environments.

[0027] Circuit board 2 is fixed inside housing 1 with screws. The control circuit on circuit board 2 uses a microprocessor with built-in PID control algorithm to receive real-time air pressure signal from high-precision air pressure sensor and compare it with the target air pressure value set by the user. The microprocessor calculates the control quantity according to the PID algorithm and outputs the control signal through the drive circuit. The drive circuit uses a dedicated chip to output PWM signal, which is then converted and amplified to drive air pump 3. By adjusting the duty cycle of the PWM signal, the speed and power of air pump 3 can be controlled accurately and quickly, thereby achieving high dynamic adjustment of output air pressure.

[0028] Both the pressure setting module 5 and the pressure display module 4 are installed on the front wall of the housing 1 for easy observation and operation by the user. The pressure setting module 5 is a button type, and the user can accurately set the target pressure value by pressing the button. The digital signal is directly transmitted to the microprocessor, which completely avoids the setting error caused by potentiometer resistance drift. The pressure display module 4 uses a digital display screen to display the current pressure value in the air circuit in real time, providing a clear human-machine interface.

[0029] The rear wall of the housing 1 is provided with a power plug 8 for connecting an external DC power supply. A fuse 9 is connected in series in the power input line to provide overcurrent protection for the entire system. After the power is processed by the power management circuit on the circuit board 2, it supplies power to all electrical components such as the circuit board 2 and the air pump 3. A toggle switch 6 is installed on the front of the housing 1 to control the power on and off of the entire control box. The power indicator light 7 is also located on the front to visually display the power status.

[0030] The housing 1 is made of 6063-T5 aluminum alloy and is CNC machined and sandblasted and oxidized. The housing 1 is lightweight, high-strength, has good heat dissipation and corrosion resistance, making it very suitable for harsh high-altitude environments. The bottom of the housing 1 is covered with multiple rubber feet, which not only ensures the stability of the equipment but also effectively absorbs and isolates external vibrations, protecting the internal precision components.

[0031] Working principle:

[0032] During use, connect the power plug 8 to a suitable external power source, ensuring the power voltage meets the equipment requirements. Turn on the overall power and the power of the air pump 3 by switching on the toggle switch 6. Observe whether the power indicator light 7 is lit. If it is lit, it indicates that the power is normally connected. After the equipment starts, input the target air pressure value through the button-type air pressure setting module 5. After input, the data will be transmitted to the main control chip on the circuit board 2. The chip processes the data and displays it on the OLED air pressure display module 4. The high-precision air pressure sensor in the air pressure detection circuit on the circuit board 2 starts to detect the air pressure at the air inlet 10 in the air path in real time and transmits the detected air pressure signal to the main control chip. The PID control algorithm inside the main control chip intelligently adjusts the pressure according to the air pressure setting value and the signal fed back by the air pressure detection module. If there is a large deviation between the detected air pressure value and the target air pressure value, the drive circuit will output PWM according to the control signal. The signal controls the start / stop and power adjustment of the air pump 3; gas enters the air path from the air inlet 10 along the air pipe, maintaining the air pressure in the air path. When the high-precision air pressure sensor in the air pressure detection circuit on the circuit board 2 detects that the air pressure is lower than the target air pressure value, due to the presence of the throttle orifice, when the air pump is normally exhausting gas by drawing gas downstream of the throttle orifice, the throttle orifice will obstruct the gas flow. Since the air pump's pumping capacity (exhaust rate) is usually greater than the gas flow rate that the throttle orifice can provide under the current operating conditions, the gas downstream of the throttle orifice is continuously drawn away but cannot be replenished by the upstream gas in time, causing its pressure to be lower than the ambient pressure. The ambient pressure creates a negative pressure in the area between the throttle orifice and the air pump. Reducing the air pump power at this time will decrease this negative pressure, causing the air pressure to rise. The gas is buffered by the air tank 12, reducing air pressure fluctuations. When the air pressure is close to the target air pressure value, the air pump will make fine adjustments until the two values ​​are very close. Then the power will remain unchanged at this value to maintain air pressure stability. When the air pump 3 adjusts its output power / flow rate, the air pressure read by the air pressure sensor will be kept within a linear range due to the presence of the air tank 12, preventing large fluctuations that could interfere with the airflow.

[0033] During equipment operation, operators monitor the air pressure data in the air circuit in real time through the OLED air pressure display module 4. If the air pressure value is found to fluctuate greatly or does not meet expectations, the target air pressure value can be readjusted through the button-type air pressure setting module 5. The main control chip will adjust the pressure again according to the new setting value. At the same time, it is necessary to regularly check whether the connection of each component is firm to ensure the safe and stable operation of the equipment.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-altitude air pressure control box, used in high-altitude aircraft to maintain the air pressure balance of electronic components, characterized in that, The device includes a housing (1), an air inlet (10), and an air outlet (11). The air inlet (10) and the air outlet (11) are both located on the rear wall of the housing (1). An air storage tank (12) is also provided inside the housing (1). The air inlet (10) and the air storage tank (12) are connected by an air passage. An air pump (3) is also provided inside the housing (1). The air storage tank (12) and the air pump (3) are connected by an air passage. The outlet of the air pump (3) is connected to the air outlet (11) by an air passage.

2. The high-altitude gas constant pressure control box according to claim 1, characterized in that, The housing (1) is also provided with a circuit board (2), which is fixed inside the housing (1) by screws. The circuit board (2) has a pressure detection circuit and a pressure sensor. The air passage between the air inlet (10) and the air storage tank (12) is connected to the pressure sensor on the circuit board (2) through a three-way pipe to detect the air pressure at the air inlet (10).

3. A high-altitude gas constant pressure control box according to claim 2, characterized in that, The air passage on the air inlet (10) passes through the air storage tank (12), and a three-way pipe extends into the air storage tank (12), with the other end of the three-way pipe connected to the air pump (3).

4. A high-altitude gas constant pressure control box according to claim 3, characterized in that, The housing (1) is also provided with a pressure display module (4) and a pressure setting module (5), both of which are installed on the front wall of the housing (1). The pressure setting module (5) is a button type. The pressure setting module (5) is fixed to the surface of the housing (1) by screws and is electrically connected to the circuit board (2) for the user to input the target pressure value. The pressure display module (4) is fixed to the surface of the housing (1) by screws and is electrically connected to the circuit board (2) for real-time display of the pressure value in the air circuit.

5. A high-altitude gas constant pressure control box according to claim 4, characterized in that, The front of the housing (1) is also provided with a toggle switch (6) and a power indicator light (7). The toggle switch (6) is fixed to the surface of the housing (1) by screws and connected to the circuit board (2) by electrical connection, and is used to switch the power supply on and off. The power indicator light (7) is fixed to the surface of the housing (1) by screws and connected to the circuit board (2) by electrical connection, and is used to indicate the power status.

6. A high-altitude gas constant pressure control box according to claim 5, characterized in that, The rear wall of the housing (1) is also provided with a power plug (8) and a fuse (9). The power plug (8) is electrically connected to the circuit board (2) for connecting to an external power source. The fuse (9) is located between the external power source and the connection circuit of the circuit board (2) for circuit protection.

7. A high-altitude gas constant pressure control box according to claim 6, characterized in that, The circuit board (2) is also provided with a control circuit and a drive circuit for connecting with other electronic components.

8. A high-altitude gas constant pressure control box according to claim 7, characterized in that, The housing (1) is made of 6063-T5 aluminum alloy and has undergone sandblasting and oxidation treatment. The bottom of the housing (1) has rubber feet for stable placement.

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