High-precision pressure stabilizing device for coping with air pressure fluctuation of output end and pressure stabilizing method of high-precision pressure stabilizing device

Abstract

The invention belongs to the technical field of pressure stabilizing devices, and discloses a high-precision pressure stabilizing device coping with output end air pressure fluctuation and a pressure stabilizing method thereof.The high-precision pressure stabilizing device comprises a pressure stabilizing air tank, an air cylinder subsystem and an air valve subsystem, an air pressure sensor is arranged on the pressure stabilizing air tank, and the air cylinder subsystem comprises a connecting pipeline, an air cylinder, a sliding table mechanism and a displacement sensor; the air valve subsystem comprises an air source, an air inlet flow valve, an air outlet flow valve and a flow sensor. The pressure stabilizing gas tank is used as a buffer of the two pressure stabilizing systems of the air cylinder subsystem and the air valve subsystem, fluctuation of air pressure of an air source is relieved, and more stable air inlet is provided. Meanwhile, the pressure stabilizing air tank provides coupling of the two subsystems, and invalid air pressure adjustment caused by mutual impact of air pressure of the two subsystems when the air cylinder subsystem and the air valve subsystem adjust the air pressure is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage stabilizing devices, and in particular to a high-precision voltage stabilizing device and a voltage stabilizing method thereof for coping with gas pressure fluctuations at an output end. Background Art

[0002] In the scientific development and technological research in the fields of machinery, aviation, aerospace, etc., high-precision constant-pressure gas source output is often required. In common usage scenarios, the accuracy requirements of the gas source pressure are low, the equipment's demand for the gas source is relatively constant, and there will be no gas reflux, etc. However, when conducting some tests, a high-precision constant-pressure gas source may be required, and the gas flow demand of the equipment varies greatly, and gas reflux into the gas source may often occur, increasing the requirements for the gas source.

[0003] For example, when analyzing the aerodynamic noise and aerodynamic performance of the intake and exhaust systems, air cooling and heat dissipation systems, and air conditioning systems of civilian vehicles, it is usually necessary to conduct wind tunnel tests on the vehicles. In the experiment, a constant pressure air source can be used as the intake and exhaust of the intake and exhaust systems, air cooling and heat dissipation systems, and air conditioning systems to simulate. In the experiment, it is necessary to test the vehicle in different motion states and environments. Considering factors such as acceleration and deceleration, crosswinds, sudden changes in wind speed, and the influence of other vehicles, the output environment of the constant pressure air source is often relatively complex, and sudden changes in gas flow rate and direction, and large fluctuations in air pressure often occur. At this time, the constant pressure air source needs to cope with changes in flow rate and output environment, and also needs to consider the situation of gas reflux, which places higher requirements on the constant pressure capability of the air source.

[0004] Generally, for equipment with low requirements for input air pressure accuracy or relatively stable air pressure requirements, the air source pressure can be adjusted by connecting the compressor to a pressure reducing valve to output relatively constant pressure gas. However, in this case, the traditional air source connected to the pressure reducing valve by the compressor cannot stably provide a constant pressure air source, and the air source output pressure will fluctuate greatly, and the gas reflux will be restricted, and a stable pressure air source output cannot be generated. Summary of the invention

[0005] The object of the present invention is to provide a high-precision voltage stabilizing device and a voltage stabilizing method thereof for coping with air pressure fluctuations at the output end, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A high-precision voltage stabilizing device for coping with air pressure fluctuations at an output end, comprising: A pressure-stabilizing gas tank, on which a pressure sensor is arranged, and the pressure sensor is used to detect the air pressure of the pressure-stabilizing gas tank; A cylinder subsystem, the cylinder subsystem comprising a connecting pipeline, a cylinder, a slide mechanism and a displacement sensor, the connecting pipeline being connected to the cylinder and the pressure-stabilizing gas tank respectively, the slide mechanism being connected to the piston shaft of the cylinder to drive the piston shaft to reciprocate, and the displacement sensor being used to detect the position of the piston shaft; The gas valve subsystem is used to control the air intake and exhaust of the pressure-stabilizing gas tank, and includes an air source, an air intake flow valve, an exhaust flow valve and a flow sensor. The air source supplies air to the pressure-stabilizing gas tank, the air intake flow valve is used to realize the air intake of the pressure-stabilizing gas tank, the exhaust flow valve is used to realize the exhaust of the pressure-stabilizing gas tank, and the flow sensor is used to detect the gas flow in and out of the pressure-stabilizing gas tank.

[0007] Furthermore, the slide mechanism includes a base, a guide rail, a slide, a motor, a rack and a gear, the guide rail and the rack are laid on the base, the slide and the guide rail are slidably matched, the motor is arranged on the base and connected to the gear, and the gear is meshed with the rack.

[0008] Furthermore, the gas valve subsystem also includes an intake check valve and an exhaust check valve. The gas source, intake flow valve, intake check valve, flow sensor, and pressure-stabilizing gas tank are connected in sequence through pipelines. The flow sensor, exhaust check valve, and exhaust flow valve are connected in sequence through pipelines, and the exhaust flow valve is connected to the atmosphere.

[0009] Furthermore, a filter assembly is provided on the pipeline between the gas source and the air intake flow valve.

[0010] The present invention also provides a voltage stabilization method of the high-precision voltage stabilization device as described above, comprising: The air pressure of the pressure-stabilizing gas tank is detected by the air pressure sensor, and the position of the piston shaft is detected by the displacement sensor; a. When the air pressure sensor detects that the air pressure in the pressure-stabilizing gas tank increases rapidly: reduce the air pressure in the pressure-stabilizing gas tank through the cylinder subsystem and / or the air valve subsystem to return the air pressure in the pressure-stabilizing gas tank to a normal value; b. When the air pressure sensor detects that the air pressure in the pressure-stabilizing gas tank decreases rapidly: increase the air pressure in the pressure-stabilizing gas tank through the cylinder subsystem and / or the air valve subsystem to return the air pressure in the pressure-stabilizing gas tank to a normal value; c. When the air pressure sensor detects a small fluctuation in the air pressure of the pressure-stabilizing gas tank, and the displacement sensor detects that the piston shaft position is at the q% to w% position of the total stroke, the range of q is 20-40, preferably 30, and the range of w is 60-80, preferably 70. The controller analyzes the curve of the pressure fluctuation of the pressure-stabilizing gas tank to obtain the amplitude and period of the air pressure, and further determines the current average air pressure through filtering; then the controller controls the motor to oscillate with the same frequency and opposite phase as the pressure fluctuation. During the pressure fluctuation process, when the air pressure decreases, the motor of the cylinder subsystem rotates clockwise to replenish air into the pressure-stabilizing gas tank; when the air pressure increases, the motor of the cylinder subsystem rotates counterclockwise, and the gas flows out of the pressure-stabilizing gas tank. This keeps the air pressure in the pressure-stabilizing gas tank stable.

[0011] d. When the air pressure sensor detects a small fluctuation in the air pressure of the pressure-stabilizing gas tank, and the displacement sensor detects that the cylinder piston position is lower than q%: the controller analyzes the curve of the air pressure fluctuation in the pressure-stabilizing gas tank to obtain the amplitude and period of the air pressure, and then controls the motor to oscillate with the same frequency and opposite phase as the air pressure fluctuation. During the air pressure fluctuation, when the air pressure decreases, the motor of the cylinder subsystem rotates clockwise to replenish air into the pressure-stabilizing gas tank; when the air pressure increases, the motor of the cylinder subsystem rotates counterclockwise, and the gas flows out of the pressure-stabilizing gas tank, thereby maintaining the stability of the air pressure in the pressure-stabilizing gas tank.

[0012] e. When the air pressure sensor detects a small fluctuation in the air pressure of the pressure-stabilizing gas tank, and the displacement sensor detects that the cylinder piston position is higher than w%: the controller analyzes the curve of the air pressure fluctuation in the pressure-stabilizing gas tank to obtain the amplitude and period of the air pressure, and then controls the motor to oscillate with the same frequency and opposite phase as the air pressure fluctuation. During the air pressure fluctuation, when the air pressure decreases, the motor of the cylinder subsystem rotates clockwise to replenish air into the pressure-stabilizing gas tank; when the air pressure increases, the motor of the cylinder subsystem rotates counterclockwise, and the gas flows out of the pressure-stabilizing gas tank, thereby maintaining the stability of the air pressure in the pressure-stabilizing gas tank.

[0013] Furthermore, the a specifically includes: When the air pressure sensor detects that the air pressure in the pressure-stabilizing gas tank increases rapidly: the motor of the cylinder subsystem rotates counterclockwise, causing the slide and the piston shaft to move upward, allowing the volume of the lower part of the cylinder to increase rapidly, and the gas in the pressure-stabilizing gas tank flows into the cylinder, thereby reducing the air pressure in the pressure-stabilizing gas tank; the exhaust flow valve opens, allowing the gas in the gas source to be discharged from the pressure-stabilizing gas tank through the pipeline, thereby reducing the air pressure in the pressure-stabilizing gas tank and returning the air pressure in the pressure-stabilizing gas tank to normal.

[0014] Furthermore, the b specifically includes: When the air pressure sensor detects that the air pressure in the pressure-stabilizing gas tank decreases rapidly: the motor of the cylinder subsystem rotates clockwise, causing the slide and the piston shaft to move downward, allowing the volume of the lower part of the cylinder to decrease rapidly, and the gas in the cylinder flows into the pressure-stabilizing gas tank, thereby increasing the air pressure in the pressure-stabilizing gas tank; the air intake flow valve opens, allowing the gas in the gas source to enter the pressure-stabilizing gas tank through the pipeline, thereby increasing the air pressure in the pressure-stabilizing gas tank and returning the air pressure in the pressure-stabilizing gas tank to normal.

[0015] Furthermore, c also includes: the controller simultaneously determines the pressure difference between the current average air pressure and the normal range of air pressure. If the current average air pressure is higher than the normal range of air pressure, the exhaust flow valve is slowly opened according to the air pressure demand to gradually reduce the average air pressure to the target value; if the current average air pressure is lower than the stabilizing air pressure, the intake flow valve is slowly opened according to the air pressure demand to gradually increase the average air pressure to the target value.

[0016] Furthermore, the d also includes: the controller controls the opening of the air intake flow valve to increase the volume of gas in the pressure-stabilizing gas tank, and at the same time the motor oscillates upward in reciprocating motion to make the piston shaft move back to a position between q%-w% of the total stroke.

[0017] Furthermore, the e also includes: the controller controls the opening of the exhaust flow valve to reduce the volume of gas in the tank, and at the same time the motor oscillates downward in reciprocating motion to make the piston shaft movement position return to a position between q%-w% of the total stroke.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1) Use the pressure-stabilizing gas tank as a buffer for the two pressure-stabilizing systems of the cylinder subsystem and the valve subsystem to alleviate the fluctuation of the air source pressure and provide a more stable air intake. At the same time, the pressure-stabilizing gas tank provides coupling between the two subsystems to reduce the ineffective air pressure regulation caused by the impact of the air pressure of the cylinder subsystem and the valve subsystem when adjusting the air pressure.

[0019] 2) Use the cylinder subsystem to adjust the air pressure. When the air pressure fluctuation range is small but the air pressure fluctuation is frequent, the air pressure in the pressure-stabilizing gas tank can be directly adjusted through the reciprocating motion of the cylinder subsystem. When the cylinder subsystem is adjusting the air pressure, there is no need to open the gas valve subsystem for frequent air replenishment and exhaust, which reduces the gas consumption of the experiment and saves a lot of energy.

[0020] 3) Using the cylinder subsystem to regulate air pressure. Since the speed control of the motor is more accurate than the flow control of the gas valve, using the cylinder subsystem to regulate air pressure can improve the accuracy of the pressure-stabilizing gas tank.

[0021] 4) Use the cylinder subsystem to regulate air pressure. Since the speed at which the cylinder piston of the cylinder subsystem changes the cylinder volume is greater than the speed at which gas can flow into the valve, the cylinder subsystem can respond quickly and control the air pressure to a large extent, and can cope with the situation where the air pressure fluctuates greatly in a short period of time.

[0022] 5) In the cylinder of the cylinder subsystem, one cavity is connected to a pressure-stabilizing gas tank, and the other cavity is filled with gas with the same target pressure. During the movement of the cylinder, the motor only needs to bear the pressure difference between the two cavities of the cylinder caused by the movement of the piston, and does not need to always bear the pressure difference between one end of the cavity and the atmosphere, which can reduce the power required by the motor during movement. Not only does it save the cost of the motor, but it also saves energy consumption during use.

[0023] 6) Filter the air pressure sensor data to obtain the average air pressure under fluctuating conditions. The air pressure subsystem can accurately adjust the air pressure in the tank without the need to control the air pressure through rapid air intake and exhaust. This saves the gas consumption of the device.

[0024] 7) When the air pressure in the pressure-stabilizing gas tank fluctuates rapidly, the cylinder subsystem and the gas valve subsystem work together to adjust the air intake or exhaust at the same time. When the air pressure fluctuates rapidly, the air pressure in the pressure-stabilizing gas tank can be effectively controlled to reduce the pressure fluctuation caused by impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the connection structure between the pressure-stabilizing gas tank and the cylinder subsystem in the present invention.

[0026] Figure 2 It is a schematic diagram of the connection structure of the cylinder subsystem in the present invention.

[0027] Figure 3 This is a schematic diagram of the connection route of the air valve subsystem, vacuum air tank, and air pressure sensor in the present invention.

[0028] In the figure: cylinder subsystem 1, slide 101, motor 102, piston shaft 103, guide rail 104, cylinder 105, connecting pipe 106, base 107, rack 108, gear 109, pressure-stabilizing gas tank 2, gas valve subsystem 3, gas source 301, filter 302, dryer 303, intake flow valve 304, intake check valve 305, flow sensor 306, atmosphere 307, exhaust flow valve 308, exhaust check valve 309, air pressure sensor 4. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 3 A high-precision voltage stabilizing device for dealing with pressure fluctuations at the output end includes a pressure stabilizing gas tank 2, a cylinder subsystem 1, and a valve subsystem 3. A pressure sensor 4 is provided on the pressure stabilizing gas tank 2. The pressure sensor 4 is used to detect the pressure of the pressure stabilizing gas tank 2. The cylinder subsystem 1 includes a connecting pipeline 106, a cylinder 105, a slide mechanism, and a displacement sensor. The connecting pipeline 106 is connected to the cylinder 105 and the pressure stabilizing gas tank 2 respectively. The slide is connected to the piston shaft 103 of the cylinder 105 to drive the piston shaft 103 to reciprocate. The displacement sensor is used to detect the position of the piston shaft 103. The gas valve subsystem 3 is used to control the air intake and exhaust of the pressure-stabilizing gas tank 2, and includes a gas source 301, an air intake flow valve 304, an exhaust flow valve 308 and a flow sensor 306. The gas source 301 supplies gas to the pressure-stabilizing gas tank 2, the air intake flow valve 304 is used to realize the air intake of the pressure-stabilizing gas tank 2, the exhaust flow valve 308 is used to realize the exhaust of the pressure-stabilizing gas tank 2, and the flow sensor 306 is used to detect the gas flow in and out of the pressure-stabilizing gas tank 2.

[0031] Continue reading Figure 2 In one embodiment of the present invention, the slide mechanism includes a base 107, a guide rail 104, a slide 101, a motor 102, a rack 108 and a gear 109. The base 107 is fixedly connected to the cylinder seat of the cylinder 105. The guide rail 104 and the rack 108 are vertically laid on the base 107. The slide 101 and the guide rail 104 slide up and down. The motor 102 is set on the base 107, which is connected to the gear 109 to drive the gear 109 to rotate, and the gear 109 is meshed with the rack 108.

[0032] When the slide mechanism is working, the motor 102 drives the gear 109 to rotate, the gear 109 moves on the rack 108, and drives the slide 101 connected to the piston shaft 103 to move back and forth up and down. When the slide 101 drives the piston shaft 103 to move upward, the cylinder 105 inhales air from the pressure-stabilizing gas tank 2. When the slide 101 drives the piston shaft 103 to move downward, the cylinder 105 exhausts air to the pressure-stabilizing gas tank 2.

[0033] Continue reading Figure 3In one embodiment of the present invention, the gas valve subsystem 3 further includes an intake check valve 305, an exhaust check valve 309, and a filter assembly, wherein the filter assembly includes a filter 302 and a dryer 303, and the gas source 301, the filter 302, the dryer 303, the intake flow valve 304, the intake check valve 305, the flow sensor 306, and the pressure-stabilizing gas tank 2 are sequentially connected through pipelines, and the flow sensor 306, the exhaust check valve 309, and the exhaust flow valve 308 are sequentially connected through pipelines, and the exhaust flow valve 308 is connected to the atmosphere, and the gas source 301 is preferably an air compressor. The intake check valve 305 allows gas to flow from the intake flow valve 304 to the flow sensor 306, but does not allow gas to flow from the flow sensor 306 to the intake flow valve 304. The exhaust check valve 309 allows gas to flow from the flow sensor 306 to the exhaust flow valve 308, but does not allow gas to flow from the exhaust flow valve 308 to the flow sensor 306.

[0034] Further explanation of the pressure stabilizing gas tank 2: The pressure-stabilizing gas tank 2 is a hollow gas tank in the shape of a cylinder. There are four circular openings on the outer wall of the gas tank. There are flange surfaces at the openings, which can be fixed to the pipeline. The first opening is connected to the gas valve subsystem, and the opening is sealed by the end cover. The high-precision air pressure sensor and flow sensor are installed on the end cover. The second opening is connected to the cylinder subsystem through a pipeline. The third opening and the fourth opening are connected to other devices that require a pressure-stabilizing gas source through pipelines, and serve as the output end of the pressure-stabilizing device to output stable constant-pressure gas.

[0035] Further explanation of the cylinder subsystem: The connecting pipe 106 is an "L"-shaped pipe with a relatively large inner diameter and flange surfaces at both ends. One end of the connecting pipe 106 is connected to the first opening of the pressure-stabilizing gas tank 2, and the other end is connected to the cylinder 105. The relatively large inner diameter of the pipe can ensure that when the cylinder 105 acts quickly, gas can be quickly replenished into the pressure-stabilizing gas tank 2, thereby reducing the air resistance of the pipe and accelerating the control speed of the cylinder subsystem.

[0036] The cylinder 105 is a large-caliber single-shaft cylinder, and the cylinder piston uses a contact piston to reduce the leakage of gas in the cylinder. The upper end of the cylinder 105 is the cylinder shaft, and the piston shaft 103 passes through the upper end cover of the cylinder 105 and is connected to the slide 101. The end cover at the lower end of the cylinder 101 has an enlarged opening and is directly connected to the connecting pipeline 106 to ensure that the gas passes smoothly through the connecting pipeline 106. At the same time, the cylinder 105 is installed on the bracket through the lower end surface to fix the entire cylinder.

[0037] The guide rail 104 is mounted on the upper end surface of the cylinder 105. The guide rail 104 is supported and connected by a base 107 and is connected to the slide 101 through two linear guides. A spur rack is mounted on the side of the linear guide and meshes with a gear 109.

[0038] The slide 101 is mounted on the guide rail 104, and the motor 102 is fixed on the slide 101 and fixed to the piston shaft 103 of the cylinder 105. The motor 102 is connected to the gear 109, which meshes with the spur rack of the guide rail 104 to drive the movement of the slide 101 and the motor 102. When the motor 102 is running, under the action of the gear 109 and the rack 108, the slide 101 and the motor 102 move linearly along the direction of the guide rail 104, and drive the piston shaft 103 of the cylinder 105 to move.

[0039] The displacement sensor is installed on the guide rail 104 and the slide 101 to detect the position of the slide 101 . Since the slide 101 and the piston shaft 103 are fixed together, the stroke of the piston shaft 103 can be calculated from the position of the slide 101 .

[0040] Further explanation of the gas valve subsystem 3: The air valve subsystem 3 is divided into an intake pipeline and an exhaust pipeline. For the intake pipeline, the high-pressure gas provided by the air compressor is filtered through the filter 302 and the dryer 303, and the gas flow is controlled by the intake flow valve 304. After passing through the intake flow valve 304, the gas passes through the first check valve 305 to limit the one-way flow of the gas into the pressure-stabilizing gas tank 2. A flow sensor 306 is installed at the inlet of the pressure-stabilizing gas tank 2, and an air pressure sensor 4 is installed in the pressure-stabilizing gas tank 2. The exhaust pipeline is installed at the front end of the flow sensor 306. After the gas in the pressure-stabilizing gas tank 2 passes through the flow sensor 306, it passes through the second check valve 309, and the flow is controlled by the exhaust flow valve 308, and finally discharged into the atmosphere.

[0041] The present invention also provides a voltage stabilization method of the high-precision voltage stabilization device as described above, comprising: The present invention installs an air pressure sensor 4 in the pressure-stabilizing gas tank 2, installs a displacement sensor on the slide 101 and the guide rail 104 of the cylinder subsystem 1, and installs a flow sensor 306 at the interface between the air valve subsystem 3 and the pressure-stabilizing gas tank 2. The position of the cylinder piston is controlled by the motor 102 of the cylinder subsystem 1. The air intake and exhaust of the pressure-stabilizing gas tank 2 are controlled by the air intake flow valve 304 and the exhaust flow valve 308 of the air valve subsystem 3. The pressure-stabilizing gas tank 2 is the output of the pressure-stabilizing device, and the pressure of the gas in the pressure-stabilizing gas tank 2 needs to be controlled to ensure that the pressure is kept constant with high precision. When the pressure-stabilizing device is in working state, the pressure-stabilizing device provides a pressure-stabilizing gas source for external equipment.

[0042] Step 1, detecting the air pressure of the pressure-stabilizing gas tank 2 by means of the air pressure sensor 4, and detecting the position of the piston shaft by means of the displacement sensor; Step 2, according to the air pressure detection and displacement detection data, the air pressure of the pressure-stabilizing gas tank 2 is controlled in the following five cases: a. When the air pressure sensor 4 detects that the air pressure in the pressure-stabilizing gas tank 2 increases rapidly: the air pressure in the pressure-stabilizing gas tank 2 is reduced through the cylinder subsystem and / or the air valve subsystem 3, so that the air pressure in the pressure-stabilizing gas tank 2 returns to the preset normal value range, wherein the air pressure in the pressure-stabilizing gas tank 2 increases by more than 200Pa per second, which can be regarded as a rapid increase in air pressure, specifically including: The motor 102 of the cylinder subsystem 1 rotates counterclockwise, causing the slide 101 and the piston shaft 103 to move upward, allowing the volume of the lower part of the cylinder 105 to increase rapidly, and the gas in the pressure-stabilizing gas tank 2 flows into the cylinder 105, thereby reducing the air pressure in the pressure-stabilizing gas tank 2; the exhaust flow valve 308 opens, allowing the gas in the gas source 301 to be discharged from the pressure-stabilizing gas tank 2 through the pipeline, thereby reducing the air pressure in the pressure-stabilizing gas tank 2 and returning the air pressure in the pressure-stabilizing gas tank 2 to the normal value range.

[0043] b. When the air pressure sensor 4 detects that the air pressure in the pressure-stabilizing gas tank 2 decreases rapidly: the air pressure in the pressure-stabilizing gas tank 2 is increased through the cylinder subsystem 1 and / or the air valve subsystem 3, so that the air pressure in the pressure-stabilizing gas tank 2 returns to the preset normal pressure range, wherein the air pressure in the pressure-stabilizing gas tank 2 decreases by more than 200Pa per second, which can be regarded as a rapid decrease in air pressure, specifically including: When the air pressure sensor 4 detects that the air pressure in the pressure-stabilizing gas tank 2 decreases rapidly: the motor 102 of the cylinder subsystem 1 rotates clockwise, causing the slide 101 and the piston shaft 103 to move downward, allowing the lower volume of the cylinder 105 to decrease rapidly, and the gas in the cylinder 105 flows into the pressure-stabilizing gas tank 2, thereby increasing the air pressure in the pressure-stabilizing gas tank 2; the air intake flow valve 304 opens, allowing the gas in the gas source 301 to enter the pressure-stabilizing gas tank 2 through the pipeline, thereby increasing the air pressure in the pressure-stabilizing gas tank 2, and returning the air pressure in the pressure-stabilizing gas tank 2 to the normal pressure range.

[0044] c. When the air pressure sensor 4 detects that the air pressure of the pressure-stabilizing gas tank 2 fluctuates slightly, and the displacement sensor detects that the piston shaft position is at the q% to w% position of the total stroke, the range of q is 20-40, preferably 30, and the range of w is 60-80, preferably 70. The controller analyzes the curve of the air pressure fluctuation of the pressure-stabilizing gas tank 2 to obtain the amplitude and period of the air pressure, and further determines the current average air pressure through filtering; then the controller controls the motor 102 to oscillate with the same frequency and opposite phase as the air pressure fluctuation. During the air pressure fluctuation process, when the air pressure decreases, the motor 102 of the cylinder subsystem 1 rotates clockwise to replenish air into the pressure-stabilizing gas tank 2; when the air pressure increases, the motor 102 of the cylinder subsystem 1 rotates counterclockwise, and the gas flows out of the pressure-stabilizing gas tank 2. Thus, the air pressure in the pressure-stabilizing gas tank 2 is kept stable. The controller also determines the pressure difference between the current average air pressure and the normal air pressure range. If the current average air pressure is higher than the normal air pressure range, the exhaust flow valve 308 is slowly opened according to the air pressure demand to gradually reduce the average air pressure to the normal air pressure range; if the current average air pressure is lower than the normal air pressure range, the intake flow valve 304 is slowly opened according to the air pressure demand to gradually increase the average air pressure to the target value.

[0045] d. When the air pressure sensor 4 detects a small fluctuation in the air pressure of the pressure-stabilizing gas tank 2, and the displacement sensor detects that the piston position of the cylinder 105 is lower than q%, the controller analyzes the curve of the air pressure fluctuation of the pressure-stabilizing gas tank 2 to obtain the amplitude and period of the air pressure, and then controls the motor 102 to oscillate with the same frequency and opposite phase as the air pressure fluctuation. During the air pressure fluctuation, when the air pressure decreases, the motor 102 of the cylinder subsystem 1 rotates clockwise to replenish air into the pressure-stabilizing gas tank 2; when the air pressure increases, the motor 102 of the cylinder subsystem 1 rotates counterclockwise, and the gas flows out of the pressure-stabilizing gas tank 2, thereby maintaining the stability of the air pressure in the pressure-stabilizing gas tank 2. At the same time, the controller controls the opening of the air intake flow valve 304 to increase the gas volume in the pressure-stabilizing gas tank 2, and the motor 102 oscillates upward in the reciprocating motion, so that the piston shaft moves back to the position between q% and w% of the total stroke.

[0046] e. When the air pressure sensor 4 detects a small fluctuation in the air pressure of the pressure-stabilizing gas tank 2, and the displacement sensor detects that the piston position of the cylinder 105 is higher than w%, the controller analyzes the curve of the air pressure fluctuation of the pressure-stabilizing gas tank 2 to obtain the amplitude and period of the air pressure, and then controls the motor 102 to oscillate with the same frequency and opposite phase as the air pressure fluctuation. During the air pressure fluctuation, when the air pressure decreases, the motor 102 of the cylinder subsystem 1 rotates clockwise to replenish air into the pressure-stabilizing gas tank 2; when the air pressure increases, the motor 102 of the cylinder subsystem 1 rotates counterclockwise, and the gas flows out of the pressure-stabilizing gas tank 2, thereby maintaining the stability of the air pressure in the pressure-stabilizing gas tank 2. At the same time, the controller controls the opening of the exhaust flow valve 308 to reduce the volume of gas in the tank, and the motor 102 oscillates downward in the reciprocating motion, so that the piston shaft movement position returns to the position between q%-w% of the total stroke.

[0047] It should be noted that the total stroke of the piston shaft mentioned above from 0 to 100% corresponds to the piston shaft moving from the lower limit position to the upper limit position. In c, d, and e, the change in air pressure of the pressure-stabilizing gas tank 2 per second is less than 200 Pa, which can be regarded as a small fluctuation in air pressure. The pressure stabilization method of the present invention is first divided into rapid changes and non-rapid changes, a and b for rapid changes, and c, d, and e for non-rapid changes. If it is not a rapid change, there are three situations: the position of the displacement sensor is less than q, between q and w, and greater than w, which are divided into c, d, and e. The present invention is mainly used for pneumatic suspension systems used in zero-gravity simulation tests, and can also be used in other scenarios.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision voltage stabilizing device for dealing with output end pressure fluctuations, characterized in that: include: A pressure-stabilizing gas tank (2), wherein a pressure sensor (4) is arranged on the pressure-stabilizing gas tank (2), and the pressure sensor (4) is used to detect the air pressure of the pressure-stabilizing gas tank (2); A cylinder subsystem (1), the cylinder subsystem (1) comprising a connecting pipeline (106), a cylinder (105), a slide mechanism and a displacement sensor, the connecting pipeline (106) being connected to the cylinder (105) and the pressure-stabilizing gas tank (2) respectively, the slide being connected to the piston shaft (103) of the cylinder (105) to drive the piston shaft (103) to perform reciprocating motion, and the displacement sensor being used to detect the position of the piston shaft (103); A gas valve subsystem (3), the gas valve subsystem (3) is used to control the intake and exhaust of a pressure-stabilizing gas tank (2), and comprises a gas source (301), an intake flow valve (304), an exhaust flow valve (308) and a flow sensor (306), the gas source (301) supplies gas to the pressure-stabilizing gas tank (2), the intake flow valve (304) is used to achieve intake of the pressure-stabilizing gas tank (2), the exhaust flow valve (308) is used to achieve exhaust of the pressure-stabilizing gas tank (2), and the flow sensor (306) is used to detect the gas flow in and out of the pressure-stabilizing gas tank (2).

2. A high-precision voltage stabilizing device for coping with output end air pressure fluctuations according to claim 1, characterized in that: The slide mechanism comprises a base (107), a guide rail (104), a slide (101), a motor (102), a rack (108) and a gear (109); the guide rail (104) and the rack (108) are laid on the base (107); the slide (101) and the guide rail (104) are slidably matched; the motor (102) is arranged on the base (107) and is connected to the gear (109); and the gear (109) is meshed with the rack (108).

3. A high-precision voltage stabilizing device for coping with output end air pressure fluctuation according to claim 1, characterized in that: The gas valve subsystem (3) further comprises an intake check valve (305) and an exhaust check valve (309); the gas source (301), the intake flow valve (304), the intake check valve (305), the flow sensor (306), and the pressure-stabilizing gas tank (2) are connected in sequence via pipelines; the flow sensor (306), the exhaust check valve (309), and the exhaust flow valve (308) are connected in sequence via pipelines; and the exhaust flow valve (308) is connected to the atmosphere.

4. A high-precision voltage stabilizing device for coping with output end air pressure fluctuations according to claim 3, characterized in that: A filter assembly is provided on the pipeline between the gas source (301) and the air intake flow valve (304).

5. A voltage stabilization method according to any one of claims 1 to 4, characterized in that: include: The air pressure of the pressure-stabilizing gas tank (2) is detected by an air pressure sensor (4), and the position of the piston shaft (103) is detected by a displacement sensor; a. When the air pressure sensor (4) detects that the air pressure in the pressure-stabilizing gas tank (2) increases rapidly: the air pressure in the pressure-stabilizing gas tank (2) is reduced through the cylinder subsystem (1) and / or the air valve subsystem (3) so that the air pressure in the pressure-stabilizing gas tank (2) returns to a normal value; b. When the air pressure sensor (4) detects that the air pressure in the pressure-stabilizing gas tank (2) decreases rapidly: the air pressure in the pressure-stabilizing gas tank (2) is increased through the cylinder subsystem (1) and / or the air valve subsystem (3), so that the air pressure in the pressure-stabilizing gas tank (2) returns to a normal value; c. When the air pressure sensor (4) detects that the air pressure of the pressure-stabilizing gas tank (2) fluctuates slightly, and the displacement sensor detects that the piston shaft position is at the q% to w% position of the total stroke, the range of q is 20-40, preferably 30, and the range of w is 60-80, preferably 70, the controller analyzes the curve of the air pressure fluctuation of the pressure-stabilizing gas tank (2) to obtain the amplitude and period of the air pressure, and further determines the current average air pressure through filtering; Then, the controller controls the motor (102) to oscillate at the same frequency and opposite phase as the air pressure fluctuation. During the air pressure fluctuation, when the air pressure decreases, the motor (102) of the cylinder subsystem (1) rotates clockwise to replenish air into the pressure-stabilizing gas tank (2); when the air pressure increases, the motor (102) of the cylinder subsystem (1) rotates counterclockwise to allow air to flow out of the pressure-stabilizing gas tank (2), thereby maintaining the air pressure in the pressure-stabilizing gas tank (2) stable. d. When the air pressure sensor (4) detects that the air pressure in the pressure-stabilizing gas tank (2) fluctuates slightly, and the displacement sensor detects that the piston position of the cylinder (105) is lower than q%, the controller analyzes the curve of the air pressure fluctuation in the pressure-stabilizing gas tank (2) to obtain the amplitude and period of the air pressure, and then controls the motor (102) to oscillate with the same frequency and opposite phase as the air pressure fluctuation. During the air pressure fluctuation, when the air pressure decreases, the motor (102) of the cylinder subsystem (1) rotates clockwise to replenish air into the pressure-stabilizing gas tank (2); when the air pressure increases, the motor (102) of the cylinder subsystem (1) rotates counterclockwise to allow air to flow out of the pressure-stabilizing gas tank (2), thereby maintaining the air pressure in the pressure-stabilizing gas tank (2) stable. e. When the air pressure sensor (4) detects that the air pressure in the pressure-stabilizing gas tank (2) fluctuates slightly, and the displacement sensor detects that the piston position of the cylinder (105) is higher than w%, the controller analyzes the curve of the air pressure fluctuation in the pressure-stabilizing gas tank (2) to obtain the amplitude and period of the air pressure, and then controls the motor (102) to oscillate with the same frequency and opposite phase as the air pressure fluctuation. During the air pressure fluctuation, when the air pressure decreases, the motor (102) of the cylinder subsystem (1) rotates clockwise to replenish air into the pressure-stabilizing gas tank (2); when the air pressure increases, the motor (102) of the cylinder subsystem (1) rotates counterclockwise to allow air to flow out of the pressure-stabilizing gas tank (2), thereby maintaining the air pressure in the pressure-stabilizing gas tank (2) stable.

6. The voltage stabilization method according to claim 5, characterized in that: The a specifically includes: When the air pressure sensor (4) detects that the air pressure in the pressure-stabilizing gas tank (2) increases rapidly: the motor (102) of the cylinder subsystem (1) rotates counterclockwise, causing the slide (101) and the piston shaft (103) to move upward, causing the volume of the lower part of the cylinder (105) to increase rapidly, and the gas in the pressure-stabilizing gas tank (2) to flow into the cylinder (105), thereby reducing the air pressure in the pressure-stabilizing gas tank (2); the exhaust flow valve (308) opens, allowing the gas in the gas source (301) to be discharged from the pressure-stabilizing gas tank (2) through the pipeline, thereby reducing the air pressure in the pressure-stabilizing gas tank (2) and returning the air pressure in the pressure-stabilizing gas tank (2) to a normal value.

7. The voltage stabilization method according to claim 5, characterized in that: The b specifically includes: When the air pressure sensor (4) detects that the air pressure in the pressure-stabilizing gas tank (2) decreases rapidly: the motor (102) of the cylinder subsystem (1) rotates clockwise, causing the slide (101) and the piston shaft (103) to move downward, causing the volume of the lower part of the cylinder (105) to decrease rapidly, and the gas in the cylinder (105) to flow into the pressure-stabilizing gas tank (2), thereby increasing the air pressure in the pressure-stabilizing gas tank (2); the air intake flow valve (304) opens, allowing the gas in the air source (301) to enter the pressure-stabilizing gas tank (2) through the pipeline, thereby increasing the air pressure in the pressure-stabilizing gas tank (2), and causing the air pressure in the pressure-stabilizing gas tank (2) to return to a normal value.

8. The voltage stabilization method according to claim 5, characterized in that: Said c also includes: the controller simultaneously determines the pressure difference between the current average air pressure and the normal air pressure range; if the current average air pressure is higher than the normal air pressure range, the exhaust flow valve (308) is slowly opened according to the air pressure demand, and the average air pressure is gradually reduced to the target value; if the current average air pressure is lower than the stabilizing air pressure, the intake flow valve (304) is slowly opened according to the air pressure demand, and the average air pressure is gradually increased to the target value.

9. The voltage stabilization method according to claim 5, characterized in that: The method d also includes: the controller controls the opening of the air intake flow valve (304) to increase the volume of gas in the pressure-stabilizing gas tank (2), while the motor (102) oscillates upward in a reciprocating motion to move the piston shaft back to a position between q% and w% of the total stroke.

10. The voltage stabilization method according to claim 5, characterized in that: The method further includes: the controller controls the exhaust flow valve (308) to open, thereby reducing the volume of gas in the tank, and at the same time the motor (102) oscillates downward in a reciprocating motion, thereby returning the piston shaft movement position to a position between q% and w% of the total stroke.

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