CN217687422U - Electric propulsion micro-flow calibration system - Google Patents

Abstract

The utility model provides an electric propulsion micro-flow calibration system, include: a first buffer tank and a flowmeter; the upstream of the first buffer tank is connected with the outlet of the gas cylinder through a gas supply pipeline; the downstream of the first buffer tank is connected with the flowmeter through a calibration pipeline, and the first buffer tank is used for buffering gas in the gas supply pipeline so as to reduce gas pressure fluctuation in the calibration pipeline; the calibration pipeline is used for setting a flow controller, and the flow meter is used for measuring the gas flow rate downstream of the flow controller. The flow calibration system can reduce the pressure fluctuation of the upstream gas of the restrictor to be calibrated, and improve the accuracy of the flow calibration result.

Description

Electric propulsion micro flow calibration system

technical field

The utility model relates to the technical field of aerospace electric propulsion, in particular to an electric propulsion micro-flow calibration system.

Background technique

In recent years, with the rapid development of microsatellites, electric propulsion microsatellites with small volume and high specific impulse have been widely used. Among them, the flow control of the propellant working fluid is the key path of the electric propulsion system, which directly determines the performance of the electric propulsion system and the success of electric propulsion. Usually, electric propulsion flow control is realized by porous plug throttling or labyrinth throttling. However, the sizes of the orifices of these two throttling devices need to be determined through flow calibration to finally establish the pressure-flow relationship of the throttling devices. During the flow calibration process, the stability of the pressure control at the front end of the throttling equipment is not high, and there are generally 5% to 10% pressure fluctuations, which makes the calibration results have large errors. In addition, the entire flow calibration process requires a lot of manpower and material resources, and the calibration efficiency is low.

In order to improve the accuracy of flow calibration results, it is particularly important to design an electric propulsion micro-flow calibration system.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide an electric propulsion micro-flow calibration system.

The utility model provides an electric propulsion micro-flow calibration system, comprising: a first buffer tank and a flow meter; wherein, the upstream of the first buffer tank is connected to the outlet of the gas cylinder through a gas supply pipeline; the downstream of the first buffer tank is connected through a calibration pipe The pipeline is connected to the flowmeter, and the first buffer tank is used to buffer the gas in the gas supply pipeline to reduce the gas pressure fluctuation in the calibration pipeline; the calibration pipeline is used to set a restrictor , the flow meter is used to measure the gas flow downstream of the restrictor.

According to an embodiment of the present utility model, the gas bottle is also included.

According to an embodiment of the present invention, the inlet of the first buffer tank is provided with a porous diffusion structure for buffering the gas entering the first buffer tank.

According to an embodiment of the present invention, it further includes a second buffer tank arranged on the air supply pipeline, and the second buffer tank is arranged upstream of the first buffer tank.

According to an embodiment of the present invention, a high-pressure self-locking valve is provided at the outlet of the gas cylinder for controlling the gas supply from the gas cylinder to the gas supply pipeline.

According to an embodiment of the present utility model, the gas supply pipeline is also provided with a first pressure regulating solenoid valve for adjusting the gas pressure in the gas supply pipeline; the first pressure regulating solenoid valve is set on the first upstream of the buffer tank.

According to an embodiment of the present utility model, the calibration pipeline is provided with a low pressure sensor for measuring the gas pressure in the calibration pipeline; the low pressure sensor is provided between the first buffer tank and the restrictor between.

According to an embodiment of the present invention, a data terminal is also included; the flow meter is connected to the data terminal, and transmits its measurement data to the data terminal.

According to an embodiment of the present invention, it also includes a power distribution module and a regulated power supply; the regulated power supply is connected to the power terminal of the power distribution module through a cable to provide power for the power distribution module; the power supply The output end of the distribution module is connected to the first pressure regulating solenoid valve and the low pressure sensor through a signal line to distribute power to the first pressure regulating solenoid valve and the low pressure sensor; the input end of the power distribution module is connected to the Data terminal connection; the data terminal is used to issue instructions to the first pressure regulating solenoid valve through the power distribution module to control the opening degree of the first pressure regulating solenoid valve, thereby controlling the gas supply pipeline The gas flow rate; the low pressure sensor transmits data to the data terminal through the power distribution module.

According to an embodiment of the present invention, the downstream of the flow meter is connected to the vacuum tank through a vacuum pipeline; the vacuum pipeline is used to evacuate the flow calibration system, thereby providing a vacuum environment for calibration.

According to the electric propulsion micro-flow calibration system of the present invention, by setting the first buffer tank, the gas in the gas supply pipeline is buffered, reducing the pressure fluctuation of the gas in the subsequent calibration pipeline, thereby reducing the pressure of the upstream gas of the restrictor Fluctuation, which solves the problem of inaccurate calibration results caused by the instability of the upstream pressure of the throttle to be calibrated.

It should be understood that the above general description and the following specific embodiments are only exemplary and explanatory, and cannot limit the scope of the present utility model.

Description of drawings

The following drawings are a part of the specification of the present invention, which illustrate exemplary embodiments of the present invention, and are used together with the description of the specification to illustrate the principle of the utility model.

Fig. 1 is a schematic diagram of an electric propulsion micro-flow calibration system according to an embodiment of the present invention;

Fig. 2 is a sectional view along the B-B direction of the enlarged view of A in Fig. 1 .

Explanation of reference signs:

1-gas cylinder, 2-high pressure sensor, 3-high pressure self-locking valve, 4-first pressure regulating solenoid valve, 5-second buffer tank, 6-low pressure sensor, 7-low pressure self-locking valve, 8-first section Flow meter, 9-first flowmeter, 10-second flowmeter, 11-second flowmeter, 12-third flowmeter, 13-third flowmeter, 14-fourth flowmeter, 15- The fourth flowmeter, 16-vacuum tank, 17-stabilized power supply, 18-power distribution module, 19-data terminal, 20-flowmeter, 21-restrictor, 22-gas supply pipeline, 23-calibration pipeline, 24-porous diffusion structure, 25-the second pressure regulating solenoid valve, 26-vacuum pipeline, 27-the first calibration branch pipeline, 28-the second calibration branch pipeline, 29-the third calibration branch pipeline, 30-the first Four calibration branch pipelines, 31 - the first buffer tank.

Detailed ways

The characteristics and exemplary embodiments of various aspects of the utility model will be described in detail below. In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. . It should be understood that the specific embodiments described here are only configured to explain the utility model and to illustrate the principle of the utility model, and are not configured to limit the utility model. Additionally, the mechanical components in the figures are not necessarily drawn to scale. For example, the size of some structural components or regions in the drawings may be exaggerated for other structural components or regions, so as to help the understanding of the embodiments of the present invention.

The orientation words appearing in the following description are all directions shown in the figure, and do not limit the specific structure of the embodiment of the present invention. In the description of the present utility model, it should be noted that unless otherwise specified, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or connected integrally. It can be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

Furthermore, the terms "comprising", "comprising", "having" or any other variation thereof are intended to cover a non-exclusive inclusion such that a set of elements comprising a structure or component includes not only those elements, but also includes elements not expressly listed or inherently included. belong to structural parts and other mechanical parts on components. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the article or device comprising the element.

Spatially relative terms such as "below", "beneath", "under", "lower", "above", "on", "higher", etc. are used to facilitate description to explain the relative The orientation of two elements means that these terms are intended to encompass different orientations of the device in addition to orientations other than those shown in the figures. In addition, for example, "one element is on/under another element" may mean that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second" and the like are also used to describe various elements, regions, parts, etc., without particularly implying a sequence or sequence, and should not be construed as limiting. Similar terms refer to similar elements throughout the description.

It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

Fig. 1 is a schematic diagram of an electric propulsion micro-flow calibration system according to an embodiment of the present invention; Fig. 2 is a cross-sectional view in the B-B direction of the enlarged view of A in Fig. 1 .

As shown in FIG. 1 , the utility model provides an electric propulsion micro-flow calibration system, including: a first buffer tank 31 and a flow meter 20 . Wherein, the upstream of the first buffer tank 31 is connected to the outlet of the gas cylinder 1 through the gas supply pipeline 22 . The downstream of the first buffer tank 31 is connected to the flowmeter 20 through the calibration pipeline 23 , and the first buffer tank 31 is used for buffering the gas in the gas supply pipeline 22 to reduce the gas pressure fluctuation in the calibration pipeline 23 . The calibration pipeline 23 is used for setting the restrictor 21 , and the flow meter 20 is used for measuring the gas flow rate downstream of the restrictor 21 .

In this embodiment, the gas cylinder is used to store the working fluid to be tested. For example, xenon gas Xe and krypton gas Kr are commonly used in electric propulsion systems. The flow calibration system provided in this embodiment buffers the gas in the gas supply pipeline by setting the first buffer tank, stabilizes the pressure of the gas in the gas supply pipeline, and reduces the pressure fluctuation of the gas in the subsequent calibration pipeline, thereby reducing the The pressure fluctuation of the gas upstream of the restrictor improves the accuracy of the calibration results. The restrictor can be a porous plug restrictor or a labyrinth restrictor.

As shown in FIG. 1 , according to an embodiment of the present invention, the flow calibration system includes a gas cylinder 1 in addition to the first buffer tank 31 and the flow meter 20 .

In this embodiment, gas cylinders are used to supply gas to the flow calibration system.

As shown in FIGS. 1 and 2 , according to an embodiment of the present invention, the inlet of the first buffer tank 31 is provided with a porous diffusion structure 24 for buffering the gas entering the first buffer tank 31 .

In this embodiment, the porous diffusion structure can reduce the speed of gas rushing into the first buffer tank. The porous diffusion structure can be integrally formed with the first buffer tank. For the porous diffusion structure, reference may be made to the orifice plate structure disclosed in the patent publication No. CN104142694B.

Further, as shown in FIG. 1 , the flow calibration system further includes a second buffer tank 5 arranged on the gas supply pipeline 22 , and the second buffer tank 5 is arranged upstream of the first buffer tank 31 .

As shown in FIG. 1 , according to an embodiment of the present invention, a high-pressure self-locking valve 3 is provided at the outlet of the gas cylinder 1 for controlling the gas supply from the gas cylinder 1 to the gas supply pipeline 22 .

In this embodiment, the high-pressure self-locking valve can isolate the measurement working fluid upstream and downstream of the flow calibration system, and control the start and end of the calibration test.

As shown in FIG. 1 , the gas supply pipeline 22 is also provided with a first pressure regulating solenoid valve 4 for adjusting the gas pressure in the gas supply pipeline 22 . The first pressure regulating solenoid valve 4 is disposed upstream of the first buffer tank 31 .

In this embodiment, the first pressure regulating solenoid valve may be a BANG-BANG solenoid valve to regulate the pressure upstream of the first buffer tank.

Further, a high pressure sensor 2 is arranged upstream of the first pressure regulating solenoid valve 4 .

Further, the high pressure self-locking valve 3 can be arranged between the high pressure sensor 2 and the first pressure regulating solenoid valve 4 .

In this embodiment, the high pressure sensor 2 is used to detect the gas pressure at the outlet of the gas cylinder. For example, the gas pressure stored in the cylinder is less than 15Mpa. The high pressure sensor can use a sensor with a measuring range of 0-20MPa and an accuracy of ±0.5%. The first pressure regulating solenoid valve can be a solenoid valve with a pressure regulating range of 0.5-15Mpa.

Further, a second pressure regulating solenoid valve 25 is provided between the first pressure regulating solenoid valve 4 and the first buffer tank 31 .

Since the primary pressure regulating range and precision of the first pressure regulating solenoid valve are limited, in this embodiment, a second pressure regulating solenoid valve is connected in series downstream of the first pressure regulating solenoid valve to further adjust the gas pressure in the gas supply pipeline. For example, the second pressure regulating solenoid valve can be a BANG-BANG solenoid valve with a pressure regulating range of 0-0.6 MPa and an accuracy of ±0.2%. That is, the second pressure regulating solenoid valve can further fine-tune the gas in the gas supply pipeline by 0-0.6 MPa on the basis of the adjustment of the first pressure regulating solenoid valve. The flow meter can be a flow meter with a range of 0 to 100 sccm, which is used to measure the flow and pressure at the outlet of the restrictor in real time.

As shown in FIG. 1 , according to an embodiment of the present invention, a second buffer tank 5 is disposed between the first pressure regulating solenoid valve 4 and the first buffer tank 31 .

In this embodiment, since the primary pressure regulating range of the first pressure regulating solenoid valve is limited, the accuracy is limited, the gas flow rate at the outlet is limited, and the gas flow rate at the outlet of the first pressure regulating solenoid valve is relatively high, in order to meet the downstream flow requirements of the flow calibration system Requirements (if the gas needs multiple action pulsating output), the first buffer tank provided can stabilize the gas pressure at the preset pressure. However, it is difficult for a single buffer tank to meet the requirements of high precision and stable pressure (for example, the gas pressure passing through the first buffer tank still fluctuates by 5% to 10%). Therefore, the flow calibration system provided in this embodiment connects the second buffer tank in series, The gas in the gas supply line is further buffered.

In addition, due to the fast flow rate of gas entering the second buffer tank, the effect of setting a porous diffusion structure at the entrance of the second buffer tank is not obvious for gas buffering. Therefore, a porous diffusion structure may not be provided at the inlet of the second buffer tank. Those skilled in the art can understand that even if the buffering effect is not obvious, the inlet of the second buffer tank can still be provided with a porous diffusion structure. Through the buffering of the gas by the second buffer tank, the first buffer tank and the porous diffusion structure, divergent pressurization can be used to control the pressure fluctuation of the gas in the first buffer tank within 1%.

This embodiment is described by taking two buffer tanks connected in series as an example, which is not intended to limit the scope of protection of the present invention. According to actual needs, multiple (two or more) buffer tanks can be connected in series to buffer the gas pressure, and a porous diffusion structure can be selectively arranged at the inlet of the buffer tank.

As shown in FIG. 1 , according to an embodiment of the present invention, the calibration pipeline 23 is provided with a low pressure sensor 6 for measuring the gas pressure in the calibration pipeline 23 . The low pressure sensor 6 is disposed between the first buffer tank 31 and the restrictor 21 .

The low pressure sensor in this embodiment can detect the outlet pressure of the first buffer tank.

Further, a low pressure self-locking valve 7 is provided between the low pressure sensor 6 and the restrictor 21 for isolating the first buffer tank 31 and the downstream restrictor 21 .

As shown in FIG. 1 , according to an embodiment of the present invention, the flow calibration system includes a data terminal 19 in addition to a first buffer tank 31 , a flow meter 20 , a first pressure regulating solenoid valve 4 and a low pressure sensor 6 . The flow meter 20 is connected to the data terminal 19 and transmits its measurement data to the data terminal 19 .

Further, as shown in FIG. 1 , the flow calibration system also includes a power distribution module 18 and a stabilized power supply 17 . The stabilized power supply 17 is connected to the power terminal of the power distribution module 18 through a cable to provide power for the power distribution module 18 . The output end of the power distribution module 18 is connected to the first pressure regulating solenoid valve 4 and the low pressure sensor 6 through signal lines, so as to distribute power to the first pressure regulating solenoid valve 4 and the low pressure sensor 6 . The input end of the power distribution module 18 is connected with the data terminal 19 . The data terminal 19 is used to issue instructions to the first pressure regulating solenoid valve 4 through the power distribution module 18 to control the opening degree of the first pressure regulating solenoid valve 4 , thereby controlling the gas flow of the gas supply pipeline 22 . The low voltage sensor 6 transmits data to the data terminal 19 through the power distribution module 18 .

Further, the output terminal of the power distribution module (DICU) 18 is connected to the high pressure sensor (HP), the high pressure self-locking valve, the second pressure regulating solenoid valve, and the low pressure self-locking valve through signal lines to distribute power thereto. The data terminal is also used to issue instructions to the high-pressure self-locking valve, the second pressure-regulating solenoid valve, and the low-pressure self-locking valve through the power distribution module to control their opening degree or opening and closing, thereby controlling the gas flow of the flow calibration system.

In this embodiment, the power distribution module (DICU) is used to distribute electrical signals and power to the aforementioned devices connected to its output terminals. The data terminal can send process instructions and perform data processing to the equipment connected or indirectly connected to it. For example, the range of the pressure regulation feedback signal of the second pressure regulation solenoid valve may be 0-0.6 MPa. The data terminal can send adjustment instructions to the second pressure-regulating solenoid valve to control its adjustment range.

The first pressure regulating solenoid valve and the second pressure regulating solenoid valve in this embodiment may be remote control solenoid valves.

As shown in FIG. 1 , according to an embodiment of the present invention, the downstream of the flow meter 20 is connected to the vacuum tank 16 through a vacuum pipeline 26 . The vacuum line 26 is used to evacuate the flow calibration system, thereby providing a vacuum environment for calibration.

According to an embodiment of the present utility model, multiple restrictors and corresponding multiple flow meters can be arranged in parallel in the calibration pipeline.

For example, as shown in FIG. 1 , the calibration pipeline 23 includes a first calibration branch pipeline 27 , a second calibration branch pipeline 28 , a third calibration branch pipeline 29 and a fourth calibration branch pipeline 30 connected in parallel. The first calibration branch pipeline 27 is provided with a first restrictor 8 and a first flow meter 9 , and the first flow meter 9 is used to measure the gas flow and pressure downstream of the first restrictor 8 . The second calibration branch pipeline 28 is provided with a second restrictor 10 and a second flowmeter 11 , and the second flowmeter 11 is used to measure the gas flow and pressure downstream of the second restrictor 10 . The third calibration branch pipeline 29 is provided with a third restrictor 12 and a third flow meter 13 , and the third flow meter 13 is used to measure the gas flow and pressure downstream of the third restrictor 12 . The fourth calibration branch pipeline 30 is provided with a fourth restrictor 14 and a fourth flowmeter 15 , and the fourth flowmeter 15 is used to measure the gas flow and pressure downstream of the fourth restrictor 14 . The output ends of the first flowmeter 9 , the second flowmeter 11 , the third flowmeter 13 and the fourth flowmeter 15 are connected to the data terminal 19 , and the measured data are transmitted to the data terminal 19 for data collection and data processing.

The flow calibration system provided in this embodiment can simultaneously calibrate the flow of multiple throttles connected in parallel (such as multiple throttles with different apertures), which greatly reduces the flow calibration time of multiple throttles and saves calibration costs. .

Further, multiple restrictors can be respectively arranged on multiple restrictor installation tooling, which facilitates the installation and disassembly of multiple restrictors. It is also possible to integrate multiple restrictors on one restrictor installation tool.

According to an embodiment of the utility model, the calibration process of the flow calibration system is as follows:

S001: Install the restrictor to be calibrated (such as restrictors with different apertures) on the restrictor installation tool;

S002: Vacuumize the flow calibration system, for example, the vacuum degree is 10 ^-1 ~ 10 ^-3 Pa;

S003: Turn on the regulated power supply and the power distribution module;

S004: Pre-set the calibration pressure range and pressure increase range on the data terminal;

S005: The data terminal controls the high pressure self-locking valve to open, and controls the first pressure regulating solenoid valve and/or the second pressure regulating solenoid valve to adjust the outlet pressure of the gas cylinder to the initial value of the calibration pressure;

S006: The low pressure sensor LP feeds back the outlet pressure value of the first buffer tank to the data terminal, and the data terminal corrects the system pressure for the first pressure regulating solenoid valve and/or the second pressure regulating solenoid valve;

S007: When the pressure measured by the low-pressure sensor reaches the initial value of the calibrated pressure, it is fed back to the data terminal, and the data terminal sends an instruction to the low-pressure self-locking valve to open the low-pressure self-locking valve;

S008: The gas passes through the restrictor to be calibrated and flows through the flowmeter. The flowmeter measures and records the outlet flow of the restrictor, and transmits the measured value to the data terminal;

S009: The data terminal repeats the above S005-S008 according to the preset pressure increase range until the pressure value measured by the low pressure sensor reaches the target peak value, and the flow data collection is completed;

S010: The data terminal automatically forms a table record file for the collected measured pressure value and the corresponding flow rate, and draws the pressure-flow relationship curve; S011: Turn off the power distribution module, the data terminal and the vacuum tank.

The flow calibration system provided by the utility model can automatically calibrate the restrictor, and can meet the requirements of micro-flow calibration, and can automatically collect and draw the pressure-flow curve, realizing the full automation of the calibration process.

The utility model is described with gas as the measuring working medium, and is not intended to limit the scope of application of the flow calibration system. The flow calibration system provided by the utility model can also calibrate the liquid working medium. Likewise, its scope of application is not limited to electric propulsion systems.

The above-mentioned embodiments of the present invention can be combined with each other and have corresponding technical effects.

The above are only preferred embodiments of the utility model, and are not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model shall be included in the utility model. within the scope of the new protection.

Claims (10)

1. The electric propulsion micro-flow calibration system is characterized in that it includes: a first buffer tank and a flow meter; wherein, the upstream of the first buffer tank is connected to the outlet of the gas cylinder through a gas supply pipeline; the downstream of the first buffer tank is passed The calibration pipeline is connected to the flowmeter, and the first buffer tank is used to buffer the gas in the gas supply pipeline to reduce the gas pressure fluctuation in the calibration pipeline; the calibration pipeline is used to set the throttle A flowmeter, the flowmeter is used to measure the gas flow downstream of the restrictor. 2. The flow calibration system according to claim 1, further comprising the gas cylinder. 3. The flow calibration system according to claim 1, wherein the inlet of the first buffer tank is provided with a porous diffusion structure for buffering the gas entering the first buffer tank. 4 . The flow calibration system according to claim 3 , further comprising a second buffer tank arranged on the air supply pipeline, and the second buffer tank is arranged upstream of the first buffer tank. 5. The flow calibration system according to claim 2, wherein a high-pressure self-locking valve is provided at the outlet of the gas cylinder for controlling the gas supply from the gas cylinder to the gas supply pipeline. 6. The flow calibration system according to claim 1, wherein the gas supply pipeline is also provided with a first pressure regulating solenoid valve for adjusting the gas pressure in the gas supply pipeline; the first pressure regulating The solenoid valve is arranged upstream of the first buffer tank. 7. The flow calibration system according to claim 6, wherein the calibration pipeline is provided with a low pressure sensor for measuring the gas pressure in the calibration pipeline; the low pressure sensor is arranged in the first buffer between the tank and the restrictor. 8. The flow calibration system according to claim 7, further comprising a data terminal; the flow meter is connected to the data terminal, and transmits its measurement data to the data terminal. 9. The flow calibration system according to claim 8, further comprising a power distribution module and a stabilized power supply; the stabilized power supply is connected to the power terminal of the power distribution module through a cable to provide the power supply The distribution module provides electricity; the output end of the power distribution module is connected to the first pressure regulating solenoid valve and the low pressure sensor through a signal line, so as to distribute power to the first pressure regulating solenoid valve and the low pressure sensor; The input end of the power distribution module is connected to the data terminal; the data terminal is used to issue instructions to the first pressure regulating solenoid valve through the power distribution module to control the opening degree of the first pressure regulating solenoid valve , so as to control the gas flow of the gas supply pipeline; the low pressure sensor transmits data to the data terminal through the power distribution module. 10. The flow calibration system according to any one of claims 1-9, characterized in that, the downstream of the flowmeter is connected to the vacuum tank through a vacuum pipeline; the vacuum pipeline is used to vacuumize the flow calibration system, thereby providing Calibration provides a vacuum environment.

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