Air pressure regulation and control device, cold air micro-propulsion system and satellite

Abstract

The invention provides an air pressure regulation and control device, a cold air micro-propulsion system and a satellite, and relates to the technical field of cold air micro-propulsion. The air pressure regulation and control device comprises a high-pressure valve, a two-stage pressure reducing valve, a precise pressure regulating valve, a buffer gas cylinder and a pressure sensor; one end of the high-pressure valve is connected with the high-pressure gas cylinder, and the other end of the high-pressure valve is connected with the two-stage pressure reducing valve through a first pipeline; the precise pressure regulating valve is provided with a first connector, a second connector, a third connector and a fourth connector, the first connector is connected with the two-stage pressure reducing valve through a second pipeline, the second connector is connected with the pressure sensor through a third pipeline, the third connector is connected with the buffer gas cylinder through a fourth pipeline, and the fourth connector is connected with the thruster. Compared with the prior art, the air pressure regulation and control device has the advantages that the mode of combining two-stage pressure reduction, air capacity buffering and air pressure closed-loop precise regulation and control is adopted, stable and low-noise air can be supplied to the thruster, and therefore high-stability and low-noise thrust output is achieved.

Description

Technical Field

[0001] The present invention relates to the field of cold air micro-propulsion technology, and in particular to an air pressure control device, a cold air micro-propulsion system and a satellite. Background Art

[0002] Gravitational waves are waves of matter generated by the violent motion and changes of matter and energy. They provide a new and important window into the universe, distinct from electromagnetic waves, and have become a crucial new avenue and means for humanity to explore and understand the unknown. Gravitational wave detection is typically achieved using gravitational wave satellites.

[0003] The cold-gas micro-propulsion system is a crucial component of gravitational wave detection satellites. In this system, cold gas is typically stored at high pressure in cylinders. During operation, the pressure is first reduced to the required level by a pressure control device, and then delivered to the cold-gas micro-thruster nozzle, providing the required thrust for the satellite. The pressure output and stability of the pressure control device are closely related to thrust accuracy.

[0004] However, gravitational wave scientific detection requires the use of high-stability, low-noise micronewton-level thrust and higher thrust resolution, which places extremely high demands on the output stability and noise of the air pressure control device. However, traditional pressure control systems do not make special requirements for pressure noise control, and cannot meet the high-precision, high-stability micronewton-level thrust and higher thrust resolution required for gravitational wave detection. Summary of the Invention

[0005] The problem to be solved by the present invention is: how to achieve thrust output with high stability and low noise.

[0006] The present invention provides an air pressure control device, comprising: a high-pressure valve, a two-stage pressure reducing valve, a precision pressure regulating valve, a buffer gas cylinder and a pressure sensor; one end of the high-pressure valve is used to connect with the high-pressure gas cylinder, and the other end of the high-pressure valve is connected to the two-stage pressure reducing valve through a first pipeline; the precision pressure regulating valve is provided with a first interface, a second interface, a third interface and a fourth interface, the first interface is connected to the two-stage pressure reducing valve through a second pipeline, the second interface is connected to the pressure sensor through a third pipeline, the third interface is connected to the buffer gas cylinder through a fourth pipeline, and the fourth interface is used to connect with a thruster; the precision pressure regulating valve comprises a base, a tail cover and a valve seat, the tail cover is connected to the The bases are connected and together form a closed cavity; a groove communicating with the closed cavity is provided on the base, the valve seat is arranged in the groove, and a gas outlet is provided on the valve seat; a four-way channel is provided inside the base, and the four-way channel is respectively communicated with the gas outlet, the second interface, the third interface and the fourth interface, and the first interface is communicated with the closed cavity; a piezoelectric ceramic drive module and a valve core are provided in the closed cavity, the valve core is passed through the piezoelectric ceramic drive module, and the valve core is used to cooperate with the gas outlet, and the piezoelectric ceramic drive module is used to energize to drive the valve core to move to change the opening of the gas outlet.

[0007] The air pressure control device provided by the present invention has, compared with the prior art, but is not limited to the following beneficial effects: The air pressure control device described in the present invention, when the device is working, can open the high-pressure valve by powering on through the external control system, so that high-pressure gas flows from the high-pressure gas cylinder along the pipeline inlet, and then reaches the two-stage pressure reducing valve after passing through the first pipeline. The high-pressure gas can be reduced to the required pressure through the two-stage pressure reducing valve, and then enter the precision pressure regulating valve through the second pipeline for precise adjustment of the air pressure. The adjusted air pressure is transmitted to the pressure sensor through the third pipeline. The control system performs closed-loop adjustment of the air pressure according to the measurement result of the pressure sensor. The outlet of the buffer gas cylinder is connected to the precision pressure regulating valve through the fourth pipeline. Its main function is to provide a buffer time for air pressure regulation, so as to achieve high-stability and low-noise output of air pressure. Finally, the high-stability and low-noise gas can be output from the fourth interface of the precision pressure regulating valve and filled into the front end of the thruster nozzle, and thrust output can be achieved according to the instructions of the control system. Compared with related technologies, the air pressure control device of the present invention adopts a combination of two-stage pressure reduction, air volume buffering and air pressure closed-loop precise control. First, the high-pressure cold air output by the gas cylinder is gradually reduced to the required nominal pressure through the two-stage pressure reduction device, and then a buffer gas cylinder is used to provide buffer time for the regulation and stabilization of the air pressure. Finally, the control system adjusts and stabilizes the air pressure output according to the air pressure measurement value of the pressure sensor, and supplies stable, low-noise gas to the thruster, thereby achieving high-stability, low-noise thrust output.

[0008] Optionally, the precision pressure regulating valve includes a base, a tail cover and a valve seat, the tail cover is connected to the base and together form a closed cavity; the base is provided with a groove connected to the closed cavity, the valve seat is arranged in the groove, and the valve seat has a gas outlet connected to the closed cavity; a four-way channel is provided inside the base, the four-way channel is respectively connected to the gas outlet, the second interface, the third interface and the fourth interface, and the first interface is connected to the closed cavity; a piezoelectric ceramic drive module and a valve core are provided in the closed cavity, the valve core is passed through the piezoelectric ceramic drive module, and one end is used to cooperate with the gas outlet, and the piezoelectric ceramic drive module is used to energize to drive the valve core to move to change the opening of the gas outlet.

[0009] Optionally, the precision pressure regulating valve also includes a fixed seat, a support seat, a first pressure seat and a spring, the fixed seat is threadedly connected to the base, and the fixed seat is located in the closed cavity, the piezoelectric ceramic drive module is arranged on the fixed seat, the support seat is connected to the end of the fixed seat away from the base, the first pressure seat is threadedly connected to the middle position of the support seat, the spring is sleeved on the valve core, and one end of the spring is against the first pressure seat, and the other end is against the boss on the valve core, and the valve core is used to close the gas outlet under the elastic force of the spring.

[0010] Optionally, the precision pressure regulating valve further includes a second pressing seat, which is threadedly connected to the groove and is used to abut against the valve seat, and the valve core is used to pass through the second pressing seat.

[0011] Optionally, the precision pressure regulating valve also includes a high-pressure sealing connector, which is arranged on the tail cover, wherein the high-pressure sealing connector is partially located inside the closed cavity and partially located outside the closed cavity, and the high-pressure sealing connector is electrically connected to the piezoelectric ceramic drive module.

[0012] Optionally, the air pressure control device further includes a mounting plate, on which the high-pressure valve, the two-stage pressure reducing valve, the precision pressure regulating valve, the buffer gas cylinder and the pressure sensor are respectively arranged, and the mounting plate is used to be connected to the satellite body.

[0013] Optionally, the air pressure regulating device also includes a pipe filter, which is arranged on the mounting plate. The second pipeline includes a first pipe fitting and a second pipe fitting. One end of the pipe filter is connected to the first interface through the first pipe fitting, and the other end of the pipe filter is connected to the two-stage pressure reducing valve through the second pipe fitting.

[0014] Optionally, the two-stage pressure reducing valve includes a high-pressure pressure reducing valve and a low-pressure pressure reducing valve, the high-pressure pressure reducing valve is connected to the first pipeline, and the low-pressure pressure reducing valve is connected to the second pipeline.

[0015] In addition, the present invention also provides a cold air micro-propulsion system, comprising a high-pressure gas cylinder, a thruster, and the gas pressure control device as described above.

[0016] Since the technical improvements and technical effects achieved by the cold air micro-propulsion system are the same as those of the air pressure control device, the technical effects of the cold air micro-propulsion system will not be described in detail.

[0017] In addition, the present invention also provides a satellite, comprising the cold air micro-propulsion system as described above.

[0018] Since the technical improvements and technical effects achieved by the satellite are the same as those of the cold gas micro-propulsion system, the technical effects of the satellite will not be described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A top view of an air pressure control device according to an embodiment of the present invention; Figure 2 is a side view of an air pressure control device according to an embodiment of the present invention; Figure 3 2 is a cross-sectional view of a precision pressure regulating valve according to an embodiment of the present invention.

[0020] Description of reference numerals: 1. High-pressure valve; 2. Two-stage pressure-reducing valve; 3. Precision pressure-regulating valve; 301. First interface; 302. Second interface; 303. Third interface; 304. Fourth interface; 305. Base; 306. Tail cover; 307. Valve seat; 308. Four-way channel; 309. Piezoelectric ceramic drive module; 310. Valve core; 311. Fixed seat; 312. Support seat; 313. First pressing seat; 314. Spring; 315. Second pressing seat; 316. Filter element; 317. High-pressure sealing connector; 4. Buffer gas cylinder; 5. Pressure sensor; 6. First pipeline; 7. Second pipeline; 701. First pipe fitting; 702. Second pipe fitting; 8. Third pipeline; 9. Fourth pipeline; 10. Mounting plate; 11. Pipe filter; 12. Support; 1201. Upper body; 1202. Lower body; 13. Arc seat. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] In the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “top”, “bottom”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections via an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] Throughout this specification, references to terms such as "an embodiment," "one embodiment," and "an implementation" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

[0025] Moreover, in the drawings, the Z axis represents the vertical direction, that is, the up and down positions, and the positive direction of the Z axis represents the top, and the negative direction of the Z axis represents the bottom.

[0026] It should also be noted that the aforementioned Z-axis representation is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] like Figures 1 to 2As shown, the air pressure control device of an embodiment of the present invention includes: a high-pressure valve 1, a two-stage pressure reducing valve 2, a precision pressure regulating valve 3, a buffer gas cylinder 4 and a pressure sensor 5; one end of the high-pressure valve 1 is used to connect to the high-pressure gas cylinder, and the other end of the high-pressure valve 1 is connected to the two-stage pressure reducing valve 2 through a first pipeline 6; the precision pressure regulating valve 3 has a first interface 301, a second interface 302, a third interface 303 and a fourth interface 304, the first interface 301 and the two-stage pressure reducing valve 2 are connected through a second pipeline 7, the second interface 302 and the pressure sensor 5 are connected through a third pipeline 8, the third interface 303 and the buffer gas cylinder 4 are connected through a fourth pipeline 9, and the fourth interface 304 is used to connect to the thruster.

[0028] In this embodiment, combined with the Figure 1 As shown, when the device is in operation, the high-pressure valve 1 can be opened by powering the external control system, allowing high-pressure gas to flow from the high-pressure gas cylinder along the pipeline inlet, then pass through the first pipeline 6 to reach the two-stage pressure reducing valve 2. The high-pressure gas can be reduced to the required pressure by the two-stage pressure reducing valve 2, and then enter the precision pressure regulating valve 3 through the second pipeline 7 for precise pressure regulation. The adjusted pressure is transmitted to the pressure sensor 5 through the third pipeline 8. The control system performs closed-loop pressure regulation based on the measurement results of the pressure sensor 5. The buffer gas cylinder 4 is connected to the precision pressure regulating valve 3 through the fourth pipeline 9. Its main function is to provide a buffer time for pressure regulation. For example, when the outlet flow demand at the fourth interface 304 increases, the buffer gas cylinder 4 can compensate for the outflowing gas. When the outlet flow demand at the fourth interface 304 decreases, the buffer gas cylinder 4 can compensate for the inflowing gas, thereby achieving highly stable and low-noise pressure output. Finally, the highly stable and low-noise gas can be output from the fourth interface 304 of the precision pressure regulating valve 3 and filled into the front end of the thruster nozzle, achieving thrust output according to the control system instructions.

[0029] Compared with related technologies, the air pressure control device of the present invention adopts a combination of two-stage pressure reduction, air volume buffering and air pressure closed-loop precise control. First, the high-pressure cold air output by the gas cylinder is gradually reduced to the required nominal pressure through the two-stage pressure reduction device, and then a buffer gas cylinder is used to provide buffer time for the regulation and stabilization of the air pressure. Finally, the control system adjusts and stabilizes the air pressure output according to the air pressure measurement value of the pressure sensor, and supplies stable, low-noise gas to the thruster, thereby achieving high-stability, low-noise thrust output.

[0030] Optionally, the precision pressure regulating valve 3 includes a base 305, a tail cover 306 and a valve seat 307, the tail cover 306 is connected to the base 305 and together form a closed cavity; the base 305 is provided with a groove connected to the closed cavity, the valve seat 307 is arranged in the groove, and the valve seat 307 has a gas outlet connected to the closed cavity; a four-way channel 308 is provided inside the base 305, and the four-way channel 308 is respectively connected to the gas outlet, the second interface 302, the third interface 303 and the fourth interface 304, and the first interface 301 is connected to the closed cavity; a piezoelectric ceramic drive module 309 and a valve core 310 are provided in the closed cavity, the valve core 310 is passed through the piezoelectric ceramic drive module 309, and one end is used to cooperate with the gas outlet, and the piezoelectric ceramic drive module 309 is used to energize to drive the valve core 310 to move to change the opening of the gas outlet.

[0031] In this embodiment, the precision pressure regulating valve 3 uses a piezoelectric ceramic drive module 309 to control the valve core 310 to achieve high-precision linear motion, and then cooperates with the valve seat 307 to achieve precise control of air pressure. Figure 3 As shown, the first interface 301 serves as the inlet of the pressure regulating valve. The gas from the second pipeline 7 can enter the closed cavity surrounded by the tail cover 306 and the base 305 through the first interface 301, and flow into the gas outlet of the valve seat 307 through the closed cavity. The valve core 310 is in a state of closing the gas outlet on the valve seat 307 in the initial state. After the piezoelectric ceramic drive module 309 is energized, the piezoelectric ceramic will deform and drive the valve core 310 to perform linear motion (see Figure 3). Figure 3In the Z-axis direction), the opening size of the gas outlet mating surface between the valve core 310 and the valve seat 307 can be changed by changing the displacement of the valve core 310, thereby adjusting the gas flow rate through the gas outlet. The gas passing through the gas outlet enters the four-way channel 308, and the gas in the four-way channel 308 will flow to the pressure sensor 5, the buffer gas cylinder 4 and the thruster respectively through the second interface 302, the third interface 303 and the fourth interface 304. When the valve core 310 is driven by the piezoelectric ceramic drive module 309 to adjust the gas flow rate at the gas outlet, the pressure in the lumen of the four-way channel 308 may fluctuate, resulting in the inability to output stable gas to the thruster, thereby failing to achieve high stability. In order to achieve high-speed and low-noise thrust output, the air pressure control device is provided with a buffer gas cylinder 4 outside the precision pressure regulating valve 3, wherein the buffer gas cylinder 4 is connected to the third interface 303 of the precision pressure regulating valve 3 through the fourth pipeline 9. Its main function is to provide a buffer time for air pressure regulation. Specifically, when the outlet flow at the fourth interface 304 becomes larger, the buffer gas cylinder 4 can compensate for the outflowing gas, giving the control system enough response time to increase the opening of the gas outlet on the valve seat 307 and maintain pressure stability; when the outlet flow at the fourth interface 304 becomes smaller, the buffer gas cylinder 4 can compensate for the inflowing gas, giving the control system enough response time to decrease the opening of the gas outlet on the valve seat 307 and maintain pressure stability.

[0032] It can be understood that the first interface 301 is the gas inlet of the precision pressure regulating valve 3, the second interface 302, the third interface 303 and the fourth interface 304 are all gas outlets of the precision pressure regulating valve 3, and the buffer gas cylinder 4 is equivalent to increasing the lumen volume of the four-way channel 308. In the process of adjusting the gas flow, the pressure balance at the outlet can be maintained.

[0033] It should be noted that the piezoelectric ceramic drive module 309 can achieve a displacement of 0-200 microns by inputting a voltage of 0-150V, driving the valve core 310 to move up and down (see Appendix Figure 3 The valve core 310 and the valve seat 307 can be matched with each other by a tapered hole. The opening size of the two matching surfaces can be adjusted by changing the displacement, thereby adjusting the flow rate of the gas and maintaining the pressure balance at the outlet.

[0034] Optionally, the precision pressure regulating valve 3 also includes a fixed seat 311, a support seat 312, a first pressure seat 313 and a spring 314. The fixed seat 311 is threadedly connected to the base 305, and the fixed seat 311 is located in the closed cavity. The piezoelectric ceramic drive module 309 is arranged on the fixed seat 311, the support seat 312 is connected to the end of the fixed seat 311 away from the base 305, the first pressure seat 313 is threadedly connected to the middle position of the support seat 312, and the spring 314 is sleeved on the valve core 310, and one end of the spring 314 is against the first pressure seat 313, and the other end is against the boss on the valve core 310. The valve core 310 is used to close the gas outlet under the elastic force of the spring 314.

[0035] In this embodiment, combined with the Figure 3 As shown, the base 305 and the tail cover 306 can be connected as one in a detachable manner by bolts, wherein the upper end of the base 305 has an annular inner wall with an internal thread, and the fixed seat 31 can be connected to the annular inner wall of the base 305 by a threaded connection. The piezoelectric ceramic drive module 309 can be installed on the fixed seat 311, and the support seat 312 can be a rod-shaped structure, which can be connected to the fixed seat 311 by bolts. The first pressing seat 313 can be threadedly connected to the middle position of the support seat 312, and the support seat 312 is coaxially arranged with the valve seat 307. The upper end of the valve core 310 is passed through the support seat 312, and the spring 314 is sleeved on the valve core 310, and one end of the spring 314 is against the first pressing seat 313, and the other end is against the convex shoulder on the valve core 310. The spring 314 is used to adjust the pressure of the valve core 310 and the valve seat 307 in the initial state to ensure that the valve core 310 and the valve seat 307 are tightly fitted and leak-proof.

[0036] Optionally, the precision pressure regulating valve 3 further includes a second pressing seat 315 , which is threadedly connected to the groove and is used to abut against the valve seat 307 , and the valve core 310 is used to pass through the second pressing seat 315 .

[0037] In this embodiment, combined with the Figure 3 As shown, the second pressing seat 315 can be a cylindrical structure with an outer peripheral wall having an external thread, which can be threadedly connected to the groove and used to abut against the valve seat 307 to limit the valve seat 307 in the groove.

[0038] Optionally, a gas channel is opened on the base 305 and is connected to the first interface 301 and the closed cavity respectively. A filter element 316 is provided in the gas channel.

[0039] In this embodiment, combined with the Figure 3As shown, a gas channel is provided on the base 305, and the two ends of the gas channel are connected to the first interface 301 and the closed cavity, respectively. In this way, the gas from the second pipeline 7 can flow into the closed cavity through the first interface 301 and the gas channel. A filter element 316 is provided in the gas channel to filter the gas flowing into the closed cavity.

[0040] Optionally, the precision pressure regulating valve 3 also includes a high-pressure sealing connector 317, which is arranged on the tail cover 306, wherein the high-pressure sealing connector 317 is partially located inside the closed cavity and partially located outside the closed cavity, and the high-pressure sealing connector 317 is electrically connected to the piezoelectric ceramic driving module 309.

[0041] In this embodiment, the high-pressure sealed connector 317 is used to connect the drive cable of the piezoelectric ceramic drive module 309 to the outside of the precision pressure regulating valve 3 to control the drive of the piezoelectric ceramic drive module 309. The piezoelectric ceramic drive module 309 can convert the electrical signal into displacement through the input of voltage, drive the valve core 310 to move up and down, and realize the precise adjustment of the opening size of the gas outlet on the valve seat 307.

[0042] Optionally, the air pressure control device also includes a mounting plate 10, on which the high-pressure valve 1, the two-stage pressure reducing valve 2, the precision pressure regulating valve 3, the buffer gas cylinder 4 and the pressure sensor 5 are respectively arranged, and the mounting plate 10 is used to be connected to the satellite body.

[0043] In this embodiment, combined with the Figure 1 As shown, the high-pressure valve 1, the two-stage pressure reducing valve 2, the precision pressure regulating valve 3, the buffer gas cylinder 4 and the pressure sensor 5 are respectively arranged on the mounting plate 10. The mounting plate 10 can be connected to the satellite body to install the device on the satellite.

[0044] Optionally, the air pressure regulating device further includes a pipe filter 11, which is arranged on the mounting plate 10, and the second pipeline 7 includes a first pipe fitting 701 and a second pipe fitting 702, one end of the pipe filter 11 is connected to the first interface 301 through the first pipe fitting 701, and the other end of the pipe filter 11 is connected to the two-stage pressure reducing valve 2 through the second pipe fitting 702.

[0045] In this embodiment, combined with the Figure 1As shown, a pipe filter 11 is also arranged on the mounting plate 10, wherein one end of the pipe filter 11 is connected to the first interface 301 of the precision pressure regulating valve 3 via a first pipe fitting 701, and the other end of the pipe filter 11 is connected to the two-stage pressure reducing valve 2 via a second pipe fitting 702. In this way, after the high-pressure gas is reduced to the required pressure by the two-stage pressure reducing valve 2, it enters the pipe filter 11 through the second pipe fitting 702, filtering the low-pressure gas and impurities contained in the pipeline. After being filtered by the pipe filter 11, the low-pressure gas enters the precision pressure regulating valve 3 through the first pipe fitting 701.

[0046] Optionally, a support 12 is provided on the mounting plate 10 , and the support 12 includes an upper body 1201 and a lower body 1202 , and the pipe filter 11 is provided between the upper body 1201 and the lower body 1202 , and the upper body 1201 and the lower body 1202 are detachably connected.

[0047] In this embodiment, combined with the Figure 2 As shown, the upper body 1201 and the lower body 1202 of the support 12 are split structures, wherein the upper body 1201 can be connected to the upper part of the lower body 1202 by bolts (see attached). Figure 2 The support 12 is oriented in the Z-axis direction, and a space for mounting the pipe filter 11 is left between the upper body 1201 and the lower body 1202. The lower body 1202 of the support 12 can be bolted to the mounting plate 10, and the pipe filter 11 can be installed between the upper body 1201 and the lower body 1202. The upper body 1201 and the lower body 1202 are then fastened together with bolts to secure the position of the pipe filter 11.

[0048] Optionally, an arc-shaped seat 13 is provided on the mounting plate 10 , and the buffer gas cylinder 4 is used to be fastened to the arc-shaped seat 13 through a throat clamp.

[0049] In this embodiment, combined with the Figure 2 As shown, an arc-shaped seat 13 is provided on the mounting plate 10, and an arc-shaped groove adapted to the outer periphery of the buffer gas cylinder 4 is opened on the upper part of the arc-shaped seat 13. The buffer gas cylinder 4 can be installed in the arc-shaped groove of the arc-shaped seat 13 and can be fastened to the arc-shaped seat 13 by a throat clamp.

[0050] Optionally, a first connection hole is respectively opened at the four corners of the mounting plate 10, and a second connection hole is opened on the satellite body. The first connection hole and the second connection hole are used to be connected by screws to fix the mounting plate 10 relative to the satellite body.

[0051] In this embodiment, combined with the Figure 1As shown, the first connection hole and the second connection hole can both be threaded holes, which are respectively connected to the first connection hole of the mounting plate 10 and the second connection hole of the satellite body by screws to fix the mounting plate 10 relative to the satellite body.

[0052] It should be noted that the envelope size of the entire device can be designed to be no more than 400mm×250mm×96.5mm, and it can be installed on the satellite through the mounting plate 10. The structure is simple, which makes it easy to install and replace the device. At the same time, the device has no unnecessary connection with other parts of the satellite, and is very convenient to use, replace and repair.

[0053] Optionally, the two-stage pressure reducing valve 2 includes a high-pressure pressure reducing valve and a low-pressure pressure reducing valve, the high-pressure pressure reducing valve is connected to the first pipeline 6 , and the low-pressure pressure reducing valve is connected to the second pipeline 7 .

[0054] In this embodiment, high-pressure gas can enter the high-pressure pressure reducing valve from the first pipeline 6 for primary pressure reduction, and then enter the low-pressure pressure reducing valve for secondary pressure reduction, ensuring that the high-pressure cold gas output from the gas cylinder is gradually reduced to the required nominal pressure.

[0055] In addition, the present invention also provides a cold air micro-propulsion system, comprising a high-pressure gas cylinder, a thruster, and the gas pressure control device as described above.

[0056] Since the technical improvements and technical effects achieved by the cold air micro-propulsion system are the same as those of the air pressure control device, the technical effects of the cold air micro-propulsion system will not be described in detail.

[0057] In addition, the present invention also provides a satellite, comprising the cold air micro-propulsion system as described above.

[0058] Since the technical improvements and technical effects achieved by the satellite are the same as those of the cold gas micro-propulsion system, the technical effects of the satellite will not be described in detail.

[0059] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0060] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An air pressure control device, characterized in that: include: A high-pressure valve (1), a two-stage pressure reducing valve (2), a precision pressure regulating valve (3), a buffer gas cylinder (4) and a pressure sensor (5); one end of the high-pressure valve (1) is used to connect to the high-pressure gas cylinder, and the other end of the high-pressure valve (1) is connected to the two-stage pressure reducing valve (2) through a first pipeline (6); the precision pressure regulating valve (3) has a first interface (301), a second interface (302), a third interface (303) and a fourth interface (304); the first interface (301) is connected to the two-stage pressure reducing valve (2) through a second pipeline (7), the second interface (302) is connected to the pressure sensor (5) through a third pipeline (8), the third interface (303) is connected to the buffer gas cylinder (4) through a fourth pipeline (9), and the fourth interface (304) is used to connect to a thruster.

2. The air pressure control device according to claim 1, characterized in that: The precision pressure regulating valve (3) comprises a base (305), a tail cover (306) and a valve seat (307), wherein the tail cover (306) is connected to the base (305) and together they enclose a closed cavity; a groove communicating with the closed cavity is provided on the base (305), the valve seat (307) is arranged in the groove, and the valve seat (307) has a gas outlet communicating with the closed cavity; a four-way channel (308) is provided inside the base (305), and the four-way channel (308) is respectively connected to the gas outlet The first interface (301) is connected to the closed cavity; a piezoelectric ceramic drive module (309) and a valve core (310) are provided in the closed cavity; the valve core (310) is passed through the piezoelectric ceramic drive module (309), and one end is used for cooperating with the gas outlet; the piezoelectric ceramic drive module (309) is used to energize to drive the valve core (310) to move, so as to change the opening of the gas outlet.

3. The air pressure control device according to claim 2, characterized in that: The precision pressure regulating valve (3) further comprises a fixed seat (311), a support seat (312), a first pressing seat (313) and a spring (314), wherein the fixed seat (311) is threadedly connected to the base (305), and the fixed seat (311) is located in the closed cavity, the piezoelectric ceramic drive module (309) is arranged on the fixed seat (311), the support seat (312) is connected to one end of the fixed seat (311) away from the base (305), the first pressing seat (313) is threadedly connected to the middle position of the support seat (312), the spring (314) is sleeved on the valve core (310), and one end of the spring (314) is against the first pressing seat (313), and the other end is against the boss on the valve core (310), and the valve core (310) is used to close the gas outlet under the elastic force of the spring (314).

4. The air pressure control device according to claim 2, characterized in that: The precision pressure regulating valve (3) further includes a second pressing seat (315), the second pressing seat (315) being threadedly connected to the groove, and the second pressing seat (315) being used to abut against the valve seat (307), and the valve core (310) being used to penetrate the second pressing seat (315).

5. The air pressure control device according to claim 2, characterized in that: The precision pressure regulating valve (3) further includes a high-pressure sealing connector (317), which is arranged on the tail cover (306), wherein the high-pressure sealing connector (317) is partially located inside the closed cavity and partially located outside the closed cavity, and the high-pressure sealing connector (317) is electrically connected to the piezoelectric ceramic drive module (309).

6. The air pressure control device according to claim 1, characterized in that: It also includes a mounting plate (10), on which the high-pressure valve (1), the two-stage pressure reducing valve (2), the precision pressure regulating valve (3), the buffer gas cylinder (4) and the pressure sensor (5) are respectively arranged, and the mounting plate (10) is used to be connected to the satellite body.

7. The air pressure control device according to claim 6, characterized in that: The device further comprises a pipeline filter (11), the pipeline filter (11) being arranged on the mounting plate (10), the second pipeline (7) comprising a first pipe fitting (701) and a second pipe fitting (702), one end of the pipeline filter (11) being connected to the first interface (301) via the first pipe fitting (701), and the other end of the pipeline filter (11) being connected to the two-stage pressure reducing valve (2) via the second pipe fitting (702).

8. The air pressure control device according to claim 1, characterized in that: The two-stage pressure reducing valve (2) comprises a high-pressure pressure reducing valve and a low-pressure pressure reducing valve, the high-pressure pressure reducing valve being connected to the first pipeline (6), and the low-pressure pressure reducing valve being connected to the second pipeline (7).

9. A cold air micro propulsion system, characterized in that: It comprises a high-pressure gas cylinder, a thruster and the gas pressure regulating device according to any one of claims 1 to 8.

10. A satellite, characterized in that: Comprising the cold gas micro-propulsion system as claimed in claim 9.

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