CN116360514A

CN116360514A - On-orbit active pressure regulating mechanism, on-orbit experimental device and pressure regulating method thereof

Info

Publication number: CN116360514A
Application number: CN202310310482.XA
Authority: CN
Inventors: 窦腾; 王珂; 乔志宏; 李响
Original assignee: Technology and Engineering Center for Space Utilization of CAS
Current assignee: Technology and Engineering Center for Space Utilization of CAS
Priority date: 2023-03-24
Filing date: 2023-03-24
Publication date: 2023-06-30

Abstract

The invention relates to an on-orbit active pressure regulating mechanism, an on-orbit experimental device and a pressure regulating method thereof, wherein the on-orbit active pressure regulating mechanism comprises a linear motor, an air cylinder, a driving plate, a first pipeline for communicating with the external environment, a second pipeline for connecting with the experimental mechanism, a three-way adapter, a first micro-switch and a second micro-switch, wherein the linear motor and the air cylinder are arranged side by side, an output shaft of the linear motor is arranged in parallel with an air cylinder rod and faces to the same side, the output shaft of the linear motor and the air cylinder rod of the air cylinder are connected with the driving plate, a first micro-switch and a second micro-switch are arranged on the running path of the driving plate, and the second micro-switch and the first micro-switch are respectively positioned at the front side and the rear side of the running path of the driving plate; a three-way adapter is arranged on the cylinder body, one connector of the three-way adapter is communicated with a rod cavity of the cylinder, the other two connectors of the three-way adapter are respectively communicated with a first pipeline and a second pipeline, a first electromagnetic valve is arranged on the first pipeline, and a second electromagnetic valve is arranged on the second pipeline.

Description

On-orbit active pressure regulating mechanism, on-orbit experimental device and pressure regulating method thereof

Technical Field

The invention relates to the technical field of space stations, in particular to an on-orbit active pressure adjusting mechanism, an on-orbit experimental device and a pressure adjusting method thereof.

Background

With the development of space science, some scientific experiments are carried out on orbit, and some experiments require active pressure adjustment, and experiments are carried out under different pressure conditions, and the experimental device is installed in the limited space on orbit.

The traditional pressure regulating mechanism has larger size, non-compact structure and larger power, and causes resource waste; the traditional pressure regulating mechanism has larger weight and does not meet the requirement of uplink weight; the existing pressure regulating mechanism is generally passively regulated, namely when the pressure is larger than a set value, the valve is automatically opened to release pressure, and active regulation of the pressure cannot be realized; the existing pressure regulating mechanism can not realize accurate active regulation of pressure, or the pressure regulating quantity does not meet the experimental requirement. Therefore, designing a pressure regulating mechanism with small volume and high reliability is a problem to be solved.

Disclosure of Invention

The invention provides an on-orbit active pressure adjusting mechanism, an on-orbit experimental device and a pressure adjusting method thereof, which aim to solve one or more of the technical problems in the prior art.

The technical scheme for solving the technical problems is as follows: the on-orbit active pressure regulating mechanism comprises a linear motor, an air cylinder, a driving plate, a first pipeline for communicating an external environment, a second pipeline for connecting an experimental mechanism, a three-way adapter, a first micro-switch and a second micro-switch, wherein the linear motor and the air cylinder are arranged side by side, an output shaft of the linear motor and an air cylinder rod of the air cylinder are arranged in parallel and face towards the same side, the output shaft of the linear motor and the air cylinder rod of the air cylinder are connected with the driving plate, a first micro-switch and a second micro-switch are arranged on a running path of the driving plate, and the second micro-switch and the first micro-switch are respectively positioned on the front side and the rear side of the running path of the driving plate; the cylinder body of the cylinder is provided with a three-way adapter, one joint of the three-way adapter is communicated with a rod cavity of the cylinder, the other two joints of the three-way adapter are respectively communicated with a first pipeline and a second pipeline, a first electromagnetic valve is arranged on the first pipeline, and a second electromagnetic valve is arranged on the second pipeline.

The beneficial effects of the invention are as follows: the on-orbit active pressure regulating mechanism has strong environmental adaptability and high reliability, and can actively regulate the pressure in the experimental mechanism according to the requirement of the spatial experimental mechanism; the linear motor with high resolution is adopted for driving, and the cylinder is driven to synchronously move, so that the pressure can be more accurately regulated, and the efficiency is improved; the electromagnetic valve is adopted to control the inlet and the outlet of the gas, so that the pressure required by the space experiment device can be effectively ensured; the travel of the cylinder is controlled by using the micro switch, so that the movement reliability can be effectively improved.

On the basis of the technical scheme, the invention can be improved as follows.

Further, the device further comprises a shell, and the linear motor, the air cylinder, the driving plate, the first pipeline, the second pipeline, the three-way adapter, the first electromagnetic valve, the second electromagnetic valve, the first micro switch and the second micro switch are all installed in the shell.

The beneficial effects of adopting the further scheme are as follows: the components are integrated in the shell, so that reasonable layout and assembly of the components can be effectively ensured, the maintenance is convenient, and the components are also convenient to connect with a space experiment mechanism.

Further, the shell comprises a bottom wall and side walls, the side walls are fixed on the periphery of the bottom wall, the linear motor is mounted on the bottom wall through a motor bracket, and the air cylinder is also mounted on the motor bracket; the first micro-switch and the second micro-switch are also respectively fixed on the bottom wall.

Further, the first pipeline and the second pipeline are respectively connected with the first electromagnetic valve and the second electromagnetic valve, and the first electromagnetic valve and the second electromagnetic valve are respectively fixed on two side walls of the shell which are oppositely arranged.

The beneficial effects of adopting the further scheme are as follows: the first pipeline and the second pipeline are arranged close to two opposite side walls, the operation of the linear motor and the air cylinder is not affected, and the first pipeline and the second pipeline are also convenient to be connected with an experimental mechanism.

Further, the first pipeline extends out of the upper end of the shell and is communicated with the external environment through a first electromagnetic valve control, and the second pipeline extends out of the upper end of the shell and is connected with the experimental mechanism through a second electromagnetic valve control.

Further, the free end of the second pipeline is provided with an air passage interface for connecting an experimental mechanism.

The beneficial effects of adopting the further scheme are as follows: the device is convenient to be connected and fixed with an experimental mechanism.

Further, a control circuit board and an electric connector are further arranged on the inner side wall of the shell, and the control circuit board is respectively and electrically connected with the linear motor, the electric connector, the first micro switch, the second micro switch, the first electromagnetic valve and the second electromagnetic valve.

The on-orbit experiment device comprises the on-orbit active pressure regulating mechanism and also comprises an experiment mechanism, wherein the inside of the experiment mechanism is connected with the second pipeline through a closed pipeline; and a pressure sensor is arranged in the experimental mechanism and is electrically connected with the control circuit board.

The beneficial effects of the invention are as follows: according to the on-orbit experiment device, the pressure sensor is matched with the on-orbit active pressure regulating mechanism, so that the active and effective regulation and control of the internal pressure of the experiment mechanism can be realized. The pressure regulating mechanism is a standard experiment module, has small volume and compact structure, and only one external electric interface (connected with an electric connector) is arranged on the device for transmitting data and supplying power to the product.

Further, quick-break connectors are respectively arranged at two ends of the closed pipeline, and the quick-break connectors are respectively in sealing connection with the experimental mechanism and the second pipeline through sealing rings.

The beneficial effects of adopting the further scheme are as follows: the quick-break joint is arranged, so that quick-break sealing connection with an experimental mechanism and a second pipeline can be facilitated.

The pressure regulating method of the on-orbit experiment device comprises the following steps: the pressure sensor detects the pressure value in the experimental mechanism, when the pressure value is smaller than a preset pressure value, the linear motor returns to a zero position, the first electromagnetic valve is closed, the second electromagnetic valve is opened, the output shaft of the linear motor is controlled to extend, the cylinder rod of the cylinder is driven to extend through the driving plate, when the driving plate triggers the second micro switch, the output shaft of the linear motor stops extending, and meanwhile the second electromagnetic valve is closed, so that one-time pressurization is completed; after pressurization is completed, the second electromagnetic valve is kept closed, the first electromagnetic valve is opened, the output shaft of the linear motor is controlled to retract, and when the driving plate triggers the first micro switch, the linear motor stops acting, and the linear motor restores to the zero position; repeating the above actions until the pressure value is equal to a preset pressure value;

when the pressure value is larger than a preset pressure value, the first electromagnetic valve is opened, the second electromagnetic valve is closed, the output shaft of the linear motor extends until the driving plate triggers the second micro switch, the first electromagnetic valve is closed at the moment, the second electromagnetic valve is opened, the output shaft of the linear motor is controlled to retract, and when the driving plate triggers the first micro switch, the linear motor stops moving to finish a one-time decompression process; after the decompression is finished, the first electromagnetic valve is opened, the second electromagnetic valve is closed, and the output shaft of the linear motor extends out until the driving plate triggers the second micro switch to prepare for the next decompression; repeating the above actions until the pressure value is equal to the preset pressure value.

The beneficial effects of the invention are as follows: the pressure regulating method can effectively regulate and control the pressure in the experimental mechanism. When the internal pressure sensor in the experimental device detects that the internal pressure meets the requirement, the linear motor stops working, if the linear motor is not positioned at the position of the micro switch at the moment, a signal can be fed back to the linear motor through the pressure sensor, and the linear motor stops moving through a control circuit board connected with the linear motor.

Drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of an on-orbit active pressure adjustment mechanism of the present invention;

FIG. 2 is a schematic top view of an in-orbit active pressure adjustment mechanism according to the present invention;

FIG. 3 is a schematic view of the outer structure of the housing of the present invention;

fig. 4 is a schematic structural diagram of an on-orbit experimental device according to the present invention.

In the drawings, the list of components represented by the various numbers is as follows:

1. a linear motor; 11. an output shaft; 12. a motor bracket; 2. a cylinder; 21. a cylinder rod; 22. a three-way adapter; 23. a rod cavity is arranged; 3. a driving plate; 4. a first pipeline; 5. a second pipeline; 51. an air path interface; 6. a first microswitch; 61. a second microswitch; 7. a first electromagnetic valve; 71. a second electromagnetic valve; 8. a housing; 81. a sidewall; 82. a bottom wall; 83. a control circuit board; 84. an electrical connector; 9. an experimental mechanism; 91. a pressure sensor; 92. a filler neck; 93. sealing the pipeline; 94. and (5) quick-break joint.

Detailed Description

The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.

As shown in fig. 1 to 3, the on-orbit active pressure adjusting mechanism of the embodiment comprises a linear motor 1, a cylinder 2, a driving plate 3, a first pipeline 4 for communicating with the external environment, a second pipeline 5 for connecting with an experimental mechanism, a three-way adapter 22, a first micro switch 6 and a second micro switch 61, wherein the linear motor 1 and the cylinder 2 are arranged side by side, an output shaft 11 of the linear motor 1 and a cylinder rod 21 of the cylinder 2 are arranged in parallel and face the same side, the output shaft 11 of the linear motor 1 and the cylinder rod 21 of the cylinder 2 are connected with the driving plate 3, a first micro switch 6 and a second micro switch 61 are arranged on the running path of the driving plate 3, and the second micro switch 61 and the first micro switch 6 are respectively positioned at the front side and the rear side of the running path of the driving plate 3; the cylinder body of the cylinder 2 is provided with a three-way adapter 22, one joint of the three-way adapter 22 is communicated with a rod cavity 23 of the cylinder 2, the other two joints of the three-way adapter 22 are respectively communicated with the first pipeline 4 and the second pipeline 5, the first pipeline 4 is provided with a first electromagnetic valve 7, and the second pipeline 5 is provided with a second electromagnetic valve 71. The first micro switch 6 is zero feedback of a linear motor, and when the linear motor retracts to move to the first micro switch, a signal of the limit displacement is fed back. The second micro switch 61 is feedback of the extension stroke of the linear motor 1, and when the linear motor extends to the second micro switch 61, a signal of the limit displacement is fed back. The linear motor is a power output device of the whole mechanism and drives the cylinder to reciprocate. The cylinder is an executing element of the mechanism and provides air source output for the whole system. The driving plate is connected with the output shaft and the cylinder rod, and converts the linear motion of the linear motor into the linear motion of the cylinder. The first electromagnetic valve and the second electromagnetic valve control the on-off of the gas circuit in the system, so that the pressure is regulated, when the experiment needs to be carried out under normal pressure, the experiment mechanism needs to be communicated with the outside atmosphere, and the first electromagnetic valve and the second electromagnetic valve need to be opened simultaneously.

As shown in fig. 1 and 2, the on-orbit active pressure adjusting mechanism of the present embodiment further includes a housing 8, and the linear motor 1, the cylinder 2, the driving plate 3, the first pipeline 4, the second pipeline 5, the three-way adapter 22, the first electromagnetic valve 7, the second electromagnetic valve 71, the first micro-switch 6 and the second micro-switch 61 are all installed in the housing 8. The components are integrated in the shell, so that reasonable layout and assembly of the components can be effectively ensured, the maintenance is convenient, and the components are also convenient to connect with a space experiment mechanism.

As shown in fig. 1 to 3, the housing 8 of the present embodiment includes a bottom wall 82 and a side wall 81, the side wall 81 is fixed around the bottom wall 82, the linear motor 1 is mounted on the bottom wall 82 through a motor bracket 12, and the cylinder 2 is also mounted on the motor bracket 12; the first microswitch 6 and the second microswitch 61 are also fixed to the bottom wall 82, respectively. The housing 8, motor mount 12 may provide structural support for the linear motor 1 and cylinder 2, providing sufficient rigidity and strength for the overall mechanism.

As shown in fig. 1 and 2, the first pipe 4 and the second pipe 5 of the present embodiment are connected to a first solenoid valve 7 and a second solenoid valve 71, respectively, and the first solenoid valve 7 and the second solenoid valve 71 are fixed to two side walls 81 of the housing 8, respectively, which are disposed opposite to each other. The first pipeline and the second pipeline are arranged close to the two side walls, the operation of the linear motor and the cylinder is not affected, and the first pipeline and the second pipeline are also convenient to be connected with an experimental mechanism.

As shown in fig. 1 and 2, the first pipe 4 of the present embodiment extends from the upper end of the housing 8 and communicates with the external environment through a first solenoid valve control, and the second pipe 5 extends from the upper end of the housing 8 and connects with an experimental mechanism through a second solenoid valve control.

As shown in fig. 1 and 2, the free end of the second pipeline 5 in this embodiment is provided with an air path interface 51 for connecting with an experimental mechanism, so as to be convenient for connection and fixation with the experimental mechanism.

As shown in fig. 1, a control circuit board 83 and an electrical connector 84 are further disposed on the inner side wall of the housing 8 in the present embodiment, and the control circuit board 83 is electrically connected to the linear motor 1, the electrical connector 84, the first micro switch 6, the second micro switch 61, the first electromagnetic valve 7 and the second electromagnetic valve 71, respectively.

The working principle of the on-orbit active pressure regulating mechanism is that when the internal pressure of an experimental mechanism needs to be increased, the linear motor returns to a zero position, the first electromagnetic valve is closed, the second electromagnetic valve is opened, the linear motor is controlled to extend, the output shaft drives the air cylinder to extend, when the driving plate triggers the second micro switch, the linear motor stops extending, and meanwhile, the second electromagnetic valve is closed, so that one-time pressurization is completed; after pressurization is completed, the second electromagnetic valve is kept to be closed, the first electromagnetic valve is opened, the output shaft of the linear motor is controlled to retract, and when the driving plate triggers the first micro switch, the linear motor stops acting, and the motor restores to the zero position. Repeating the above movement to complete the pressurizing process;

when the pressure in the experimental device needs to be reduced, the first electromagnetic valve is opened firstly, the second electromagnetic valve is closed, the output shaft of the linear motor extends out until the second micro switch is triggered, at the moment, the first electromagnetic valve is closed, the second electromagnetic valve is opened, the output shaft is controlled to retract, and when the driving plate triggers the first micro switch, the linear motor stops moving, so that a decompression process is completed; after the decompression is completed, the first electromagnetic valve is opened, the second electromagnetic valve is closed, the linear motor stretches out until the driving plate triggers the second micro switch, and preparation is made for the next decompression.

The on-orbit active pressure regulating mechanism has strong environmental adaptability and high reliability, and can actively regulate the pressure in the experimental mechanism according to the requirement of the spatial experimental mechanism; the linear motor with high resolution is adopted for driving, and the cylinder is driven to synchronously move, so that the pressure can be more accurately regulated, and the efficiency is improved; the electromagnetic valve is adopted to control the inlet and the outlet of the gas, so that the pressure required by the space experiment device can be effectively ensured; the travel of the cylinder is controlled by using the micro switch, so that the movement reliability can be effectively improved.

As shown in fig. 1 to 4, the embodiment further provides an on-orbit experiment device, which comprises the on-orbit active pressure adjusting mechanism and further comprises an experiment mechanism 9, wherein the inside of the experiment mechanism 9 is connected with the second pipeline 5 through a closed pipeline 93; the experiment mechanism 9 is internally provided with a pressure sensor 91, and the pressure sensor 91 is electrically connected with the control circuit board. The experiment mechanism 9 is provided with a filling port 92 for filling liquid.

As shown in fig. 4, two ends of the closed pipeline 93 in this embodiment are respectively provided with a quick-break connector 94, the quick-break connector 94 is respectively connected with the experimental mechanism 9 and the second pipeline 5 in a sealing manner through a sealing ring, and the sealing ring can adopt a double O-ring. The quick-break joint is arranged, so that quick-break sealing connection with an experimental mechanism and a second pipeline can be facilitated.

All gas paths of the on-orbit experimental device are sealed by adopting double O-shaped rings, so that no leakage of gas is ensured, and the pressure regulating efficiency is improved.

In the on-orbit experimental device, the pressure regulating mechanism provides an air source for the system, the internal pressure of the experimental mechanism is regulated, the pressure sensor is arranged in the experimental mechanism, the internal pressure signal of the experimental mechanism can be fed back, and is transmitted to the internal control circuit board of the pressure regulating mechanism through an electric signal, when the feedback experimental pressure of the pressure sensor in the experimental mechanism does not meet the requirement, the pressure regulating mechanism starts to work until the pressure meets the experimental requirement; when the experimental mechanism needs to work under normal pressure, the pressure regulating mechanism does not work, and all the electromagnetic valves are opened.

The on-orbit experimental device of the embodiment can realize the active and effective regulation and control of the internal pressure of the experimental mechanism through the cooperation of the pressure sensor and the on-orbit active pressure regulating mechanism. The pressure regulating mechanism is a standard experiment module, has small volume and compact structure, and only one external electric interface (connected with an electric connector) is arranged on the device for transmitting data and supplying power to the product.

The pressure adjusting method of the on-orbit experimental device comprises the following steps: the pressure sensor 91 detects the pressure value inside the experiment mechanism 9, when the pressure value is smaller than a preset pressure value, the linear motor 1 returns to a zero position, the first electromagnetic valve 7 is closed, the second electromagnetic valve 71 is opened, the output shaft 11 of the linear motor 1 is controlled to extend, meanwhile, the driving plate 3 drives the cylinder rod 21 of the cylinder 2 to extend, when the driving plate 3 triggers the second micro switch 61, the output shaft 11 of the linear motor 1 stops extending, and meanwhile, the second electromagnetic valve 71 is closed, so that one-time pressurization is completed; after the pressurization is finished, the second electromagnetic valve 71 is kept to be closed, the first electromagnetic valve 7 is opened, the output shaft 11 of the linear motor 1 is controlled to retract, when the driving plate 3 triggers the first micro switch 6, the linear motor 1 stops acting, and the linear motor 1 returns to the zero position; repeating the above actions until the pressure value is equal to a preset pressure value;

when the pressure value is larger than a preset pressure value, the first electromagnetic valve 7 is opened, the second electromagnetic valve 71 is closed, the output shaft 11 of the linear motor 1 stretches out until the driving plate 3 triggers the second micro switch 61, at the moment, the first electromagnetic valve 7 is closed, the second electromagnetic valve 71 is opened, the output shaft 11 of the linear motor 1 is controlled to retract, and when the driving plate 3 triggers the first micro switch 6, the linear motor 1 stops moving, and a decompression process is completed; after the decompression is completed, the first electromagnetic valve 7 is opened, the second electromagnetic valve 71 is closed, and the output shaft 11 of the linear motor 1 extends out until the driving plate 3 triggers the second micro switch 61 to prepare for the next decompression; repeating the above actions until the pressure value is equal to the preset pressure value.

The pressure regulating method of the embodiment can effectively regulate and control the pressure in the experimental mechanism. When the internal pressure sensor in the experimental device detects that the internal pressure meets the requirement, the linear motor stops working, if the linear motor is not positioned at the position of the micro switch at the moment, a signal can be fed back to the linear motor through the pressure sensor, and the linear motor stops moving through a control circuit board connected with the linear motor.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. The on-orbit active pressure regulating mechanism is characterized by comprising a linear motor, an air cylinder, a driving plate, a first pipeline for communicating an external environment, a second pipeline for connecting an experimental mechanism, a three-way adapter, a first micro-switch and a second micro-switch, wherein the linear motor and the air cylinder are arranged side by side, an output shaft of the linear motor and a cylinder rod of the air cylinder are arranged in parallel and face the same side, the output shaft of the linear motor and the cylinder rod of the air cylinder are connected with the driving plate, and a first micro-switch and a second micro-switch are arranged on a running path of the driving plate and are respectively positioned on the front side and the rear side of the running path of the driving plate; the cylinder body of the cylinder is provided with a three-way adapter, one joint of the three-way adapter is communicated with a rod cavity of the cylinder, the other two joints of the three-way adapter are respectively communicated with a first pipeline and a second pipeline, a first electromagnetic valve is arranged on the first pipeline, and a second electromagnetic valve is arranged on the second pipeline.

2. The on-orbit active pressure adjustment mechanism of claim 1, further comprising a housing, wherein the linear motor, cylinder, drive plate, first conduit, second conduit, three-way adapter, first solenoid valve, second solenoid valve, first microswitch and second microswitch are all mounted within the housing.

3. The on-orbit active pressure adjustment mechanism according to claim 2, wherein the housing comprises a bottom wall and side walls, the side walls being fixed around the bottom wall, the linear motor being mounted on the bottom wall by a motor mount, the cylinder also being mounted on the motor mount; the first micro-switch and the second micro-switch are also respectively fixed on the bottom wall.

4. An on-orbit active pressure adjustment mechanism according to claim 3, wherein the first and second lines are connected to first and second solenoid valves, respectively, which are fixed to two side walls of the housing that are disposed opposite each other.

5. The on-orbit active pressure adjustment mechanism according to claim 4, wherein the first conduit extends from the upper end of the housing and is in communication with the external environment via a first solenoid valve control, and the second conduit extends from the upper end of the housing and is connected to the experimental mechanism via a second solenoid valve control.

6. The on-orbit active pressure adjustment mechanism according to claim 1, wherein the free end of the second conduit is provided with a gas path interface for connecting to an experimental mechanism.

7. The on-orbit active pressure adjustment mechanism according to any one of claims 2 to 5, wherein a control circuit board and an electrical connector are further provided on the inside wall of the housing, the control circuit board being electrically connected to the linear motor, the electrical connector, the first micro switch, the second micro switch, the first solenoid valve and the second solenoid valve, respectively.

8. The on-orbit experiment device is characterized by comprising the on-orbit active pressure regulating mechanism as claimed in claim 7, and further comprising an experiment mechanism, wherein the inside of the experiment mechanism is connected with the second pipeline through a closed pipeline; and a pressure sensor is arranged in the experimental mechanism and is electrically connected with the control circuit board.

9. The on-orbit experimental device according to claim 8, wherein two ends of the closed pipeline are respectively provided with a quick-break joint, and the quick-break joints are respectively connected with the experimental mechanism and the second pipeline in a sealing way through sealing rings.

10. The method for pressure regulation of an on-orbit laboratory apparatus according to claim 8 or 9, characterized by comprising the steps of: the pressure sensor detects the pressure value in the experimental mechanism, when the pressure value is smaller than a preset pressure value, the linear motor returns to a zero position, the first electromagnetic valve is closed, the second electromagnetic valve is opened, the output shaft of the linear motor is controlled to extend, the cylinder rod of the cylinder is driven to extend through the driving plate, when the driving plate triggers the second micro switch, the output shaft of the linear motor stops extending, and meanwhile the second electromagnetic valve is closed, so that one-time pressurization is completed; after pressurization is completed, the second electromagnetic valve is kept closed, the first electromagnetic valve is opened, the output shaft of the linear motor is controlled to retract, and when the driving plate triggers the first micro switch, the linear motor stops acting, and the linear motor restores to the zero position; repeating the above actions until the pressure value is equal to a preset pressure value;