CN217687422U - Electric propulsion micro-flow calibration system - Google Patents
Electric propulsion micro-flow calibration system Download PDFInfo
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- CN217687422U CN217687422U CN202221152475.9U CN202221152475U CN217687422U CN 217687422 U CN217687422 U CN 217687422U CN 202221152475 U CN202221152475 U CN 202221152475U CN 217687422 U CN217687422 U CN 217687422U
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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
Technical Field
The utility model relates to an aerospace electric propulsion technical field, concretely relates to electric propulsion micro-flow calibration system.
Background
In recent years, with the rapid development of micro satellites, electrically propelled micro satellites with small size and high specific impulse are widely used. The flow control of the propulsion working medium is used as a key path of the electric propulsion system, and directly determines the performance of the electric propulsion system and the success of electric propulsion. Typically, electrically-propelled flow control is achieved by a porous plug restriction or a labyrinth restriction. However, the sizes of the two throttling device orifices need to be determined by flow calibration to ultimately establish the pressure-flow relationship of the throttling device. In the flow calibration process, the stability of the pressure control at the front end of the throttling device is not high, and 5% -10% of pressure fluctuation generally exists, so that the error of the calibration result is large. In addition, a large amount of manpower and material resources are consumed in the whole flow calibration process, and the calibration efficiency is low.
In order to improve the accuracy of the flow calibration result, it is very important to design an electrically-propelled micro-flow calibration system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide electric propulsion micro-flow calibration system.
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 arranging a restrictor, and the flowmeter is used for measuring the gas flow rate downstream of the restrictor.
According to an embodiment of the utility model, still include the gas cylinder.
According to the utility model discloses an embodiment, first buffer tank entry is provided with porous diffusion structure for to getting into first buffer tank is gaseous cushions.
According to the utility model discloses an embodiment, still including set up in second buffer tank on the air supply line, the second buffer tank set up in the upstream of first buffer tank.
According to the utility model discloses an embodiment, the gas cylinder exit is provided with high-pressure self-locking valve, is used for control the gas cylinder to the air supply line air feed.
According to an embodiment of the present invention, the air supply line is further provided with a first pressure regulating solenoid valve for regulating the gas pressure in the air supply line; the first pressure regulating solenoid valve is arranged at the upstream of the first buffer tank.
According to an embodiment of the present invention, the calibration pipe is provided with a low pressure sensor for measuring the gas pressure in the calibration pipe; the low pressure sensor is disposed between the first surge tank and the choke.
According to an embodiment of the present invention, the system further comprises a data terminal; the flowmeter is connected with the data terminal and transmits the measured data to the data terminal.
According to an embodiment of the utility model, the utility model also comprises a power distribution module and a stabilized voltage power supply; the stabilized voltage power supply is connected with the power supply terminal of the power distribution module through a cable to provide electric quantity for the power distribution module; the output end of the power distribution module is connected with the first voltage regulating electromagnetic valve and the low-voltage sensor through signal wires so as to distribute power to the first voltage regulating electromagnetic valve and the low-voltage sensor; the input end of the power distribution module is connected with the data terminal; the data terminal is used for issuing an instruction to the first pressure regulating electromagnetic valve through the power distribution module so as to control the opening degree of the first pressure regulating electromagnetic valve and further control the gas flow of the gas supply pipeline; and the low-voltage sensor transmits data to the data terminal through the power distribution module.
According to an embodiment of the present invention, the flow meter downstream is connected to a vacuum tank via a vacuum line; the vacuum pipeline is used for vacuumizing the flow calibration system, so that a vacuum environment is provided for calibration.
According to the utility model discloses an electric propulsion micro-flow calibration system through setting up first buffer tank, cushions the gas of air supply line, has reduced the follow-up pressure oscillation of demarcating gas in the pipeline to reduce the gaseous pressure fluctuation in flow controller upper reaches, solved and caused the unsafe problem of calibration result because of the unstability of waiting to demarcate flow controller upper reaches pressure.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification of the invention, illustrate exemplary embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of an electrically-propelled micro-flow calibration system according to an embodiment of the present invention;
fig. 2 is a cross-sectional view in the direction B-B of the enlarged view of a in fig. 1.
Description of reference numerals:
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 flow controller, 9-first flow meter, 10-second flow controller, 11-second flow meter, 12-third flow controller, 13-third flow meter, 14-fourth flow controller, 15-fourth flow meter, 16-vacuum tank, 17-voltage-stabilized power supply, 18-power distribution module, 19-data terminal, 20-flow meter, 21-flow controller, 22-gas supply pipeline, 23-calibration pipeline, 24-porous diffusion structure, 25-second pressure regulating solenoid valve, 26-vacuum pipeline, 27-first calibration branch pipeline, 28-second calibration branch pipeline, 29-third calibration branch pipeline, 30-fourth calibration branch pipeline, 31-first buffer tank.
Detailed Description
The features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention, for the purposes of illustrating the principles of the invention. Additionally, the components in the drawings are not necessarily to scale. For example, the dimensions of some of the structures or regions in the figures may be exaggerated relative to other structures or regions to help improve understanding of embodiments of the present invention.
The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise specified, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection, a detachable connection, or an integral connection. May be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.
Furthermore, the terms "comprises," "comprising," "includes," "including," "has," "having" or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure or component comprising a list of elements does not include only those elements but may include other mechanical components not expressly listed or inherent to such structure or component. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" 8230; "does not exclude the presence of additional like elements in an article or device comprising the element.
Spatial relationship terms such as "below," "at \8230," "lower," "above," "at \8230," "upper," "higher," and the like are used for convenience in description to explain the positioning of one element relative to a second element, indicating that the terms are intended to encompass different orientations of the device in addition to orientations different from those shown in the figures. Further, for example, the phrase "one element is over/under another element" may mean that the two elements are in direct contact, or that there is another element between the two elements. Furthermore, terms such as "first", "second", and the like are also used to describe various elements, regions, sections, etc. and are not intended to be particularly descriptive in an ordinal or sequential sense and should not be interpreted as limiting. Like terms refer to like 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 merely intended to provide a better understanding of the invention by illustrating examples thereof.
Fig. 1 is a schematic diagram of an electrically propelled micro-flow calibration system according to an embodiment of the present invention; fig. 2 is a cross-sectional view in the direction B-B 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, include: a first buffer tank 31 and a flow meter 20. Wherein, the upstream of the first buffer tank 31 is connected with the outlet of the gas cylinder 1 through the gas supply pipeline 22. The first buffer tank 31 is connected with the flowmeter 20 through the calibration pipeline 23 at the downstream, and the first buffer tank 31 is used for buffering the gas in the gas supply pipeline 22 so as to reduce the pressure fluctuation of the gas in the calibration pipeline 23. The calibration line 23 is used to set the restriction 21 and the flow meter 20 is used to measure the gas flow downstream of the restriction 21.
In this embodiment, the gas cylinder is used for storing the working medium to be tested. For example, xenon Xe and krypton Kr are commonly used in electric propulsion systems. The flow calibration system provided by the embodiment buffers the gas of the gas supply pipeline by arranging 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 pressure fluctuation of the gas at the upstream of the restrictor and improving the accuracy of the calibration result. The restriction may be a porous plug restriction or a labyrinth restriction.
As shown in fig. 1, according to an embodiment of the present invention, the flow calibration system further includes a gas cylinder 1 in addition to the first buffer tank 31 and the flow meter 20.
In this embodiment, the gas cylinder is used to supply gas to the flow calibration system.
As shown in fig. 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 velocity of the gas rushing into the first buffer tank. The porous diffusion structure may be integrally formed with the first buffer tank. The porous diffusion structure can be referred to a porous plate structure disclosed in patent publication No. CN 104142694B.
Further, as shown in fig. 1, the flow calibration system further includes a second buffer tank 5 disposed on the air supply line 22, and the second buffer tank 5 is disposed 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 cylinder 1 to supply gas to the gas supply pipeline 22.
In this embodiment, the high-pressure self-locking valve can block the upstream and downstream measuring working media of the flow calibration system, and control the start and end of the calibration test.
As shown in fig. 1, the gas supply line 22 is further provided with a first pressure regulating solenoid valve 4 for regulating the gas pressure in the gas supply line 22. The first pressure-regulating solenoid valve 4 is provided 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 pressure upstream of the first buffer tank.
Further, a high-pressure sensor 2 is provided upstream of the first pressure-regulating solenoid valve 4.
Further, the high pressure latching valve 3 may be disposed between the high pressure sensor 2 and the first pressure regulating solenoid valve 4.
In the present embodiment, the high pressure sensor 2 is used to detect the gas pressure at the outlet of the gas cylinder. For example, the pressure of stored gas in the cylinder is less than 15Mpa. The high-voltage sensor can adopt a sensor with the measuring range of 0-20 MPa and the precision of +/-0.5%. The first pressure regulating solenoid valve may be one with pressure regulating range of 0.5-15 MPa.
Further, a second pressure regulating solenoid valve 25 is provided between the first pressure regulating solenoid valve 4 and the first buffer tank 31.
Because first pressure regulating solenoid valve once the pressure regulating range is limited, the precision is limited, in this embodiment, establish ties the second pressure regulating solenoid valve at first pressure regulating solenoid valve low reaches, can further adjust gas pressure in the gas supply line. For example, the second pressure regulating solenoid valve can adopt a BANG-BANG solenoid valve with the pressure regulating range of 0-0.6 MPa and the precision of +/-0.2%. Namely, the second pressure regulating solenoid valve can further finely regulate the gas in the gas supply pipeline to 0 to 0.6MPa on the basis of the regulation of the first pressure regulating solenoid valve. The flow meter can adopt a flow meter with the measuring range of 0-100 sccm and is used for measuring the flow and the 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, because first pressure regulating solenoid valve once pressure regulating range is limited, the precision is limited, export gas flow is limited, and first pressure regulating solenoid valve exit gas velocity of flow is higher, for satisfying the demand of flow calibration system low reaches to the flow (if need gaseous action pulsation formula output many times), the first buffer tank of setting can be stabilized gas pressure at preset pressure. However, it is difficult for a single buffer tank to meet the requirement of high precision and stable pressure (for example, the gas pressure passing through the first buffer tank still has 5% to 10% fluctuation), so the flow calibration system provided in this embodiment is connected in series with the second buffer tank to further buffer the gas in the gas supply pipeline.
In addition, because the gas flow rate that gets into the second buffer tank is very fast, it is not obvious to the gas buffering effect to set up porous diffusion structure at the second buffer tank entry. Therefore, the porous diffusion structure may not be provided at the second buffer tank inlet. It will be appreciated by those skilled in the art that the second buffer tank inlet may be provided with a porous diffusion structure even if the buffering effect is not significant. Through the buffering of second buffer tank, first buffer tank and porous diffusion structure to gas, can disperse formula pressurization make gas pressure fluctuation control in first buffer tank within 1%.
The present embodiment is described by taking two buffer tanks connected in series as an example, and is not intended to limit the protection scope of the present invention. According to actual requirements, a plurality of (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 each 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 throttle 21.
The low pressure sensor in this embodiment may detect the first buffer tank outlet pressure.
Further, a low-pressure self-locking valve 7 is provided between the low-pressure sensor 6 and the restrictor 21 for blocking 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 further includes a data terminal 19, in addition to the first buffer tank 31, the flow meter 20, the first pressure regulating solenoid valve 4, and the 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 further includes a power distribution module 18 and a regulated power supply 17. The regulated power supply 17 is connected to the power terminals of the power distribution module 18 via a cable to supply power to the power distribution module 18. The output end of the power distribution module 18 is connected with the first pressure regulating electromagnetic valve 4 and the low-voltage sensor 6 through signal lines to distribute power to the first pressure regulating electromagnetic valve 4 and the low-voltage sensor 6. The input of the power distribution module 18 is connected to a data terminal 19. The data terminal 19 is configured to issue an instruction 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, so as to control the gas flow of the gas supply line 22. The low voltage sensor 6 transmits data to the data terminal 19 through the power distribution module 18.
Further, the output end of a power distribution module (DICU) 18 is connected with 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 so as to distribute power to the high-pressure sensor, the high-pressure self-locking valve, the second pressure regulating solenoid valve and the low-pressure self-locking valve. The data terminal is also used for issuing instructions to the high-pressure self-locking valve, the second pressure regulating electromagnetic valve and the low-pressure self-locking valve through the power distribution module to control the opening degree or opening and closing of the high-pressure self-locking valve, the second pressure regulating electromagnetic valve and the low-pressure self-locking valve, so that the gas flow of the flow calibration system is controlled.
In this embodiment, a power distribution module (DICU) is used to distribute electrical signals and power to the devices connected to its outputs. The data terminal can send flow instructions and process data to the devices connected or indirectly connected with the data terminal. For example, the pressure regulating feedback signal range of the second pressure regulating solenoid valve may be 0 to 0.6MPa. The data terminal can send an adjusting instruction to the second pressure regulating electromagnetic valve so as to control the adjusting range of the second pressure regulating electromagnetic valve.
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 one embodiment of the present invention, the flow meter 20 is connected downstream to the vacuum tank 16 by a vacuum line 26. The vacuum line 26 is used to evacuate the flow calibration system, thereby providing a vacuum environment for calibration.
According to the utility model discloses an embodiment, the calibration pipeline can parallelly connected set up a plurality of throttlers and a plurality of corresponding flowmeters.
For example, as shown in FIG. 1, the calibration circuit 23 includes a first calibration branch circuit 27, a second calibration branch circuit 28, a third calibration branch circuit 29, and a fourth calibration branch circuit 30 connected in parallel. The first calibration branch 27 is provided with a first restriction 8 and a first flow meter 9, the first flow meter 9 being arranged to measure the gas flow and pressure downstream of the first restriction 8. The second calibration branch 28 is provided with a second choke 10 and a second flow meter 11, the second flow meter 11 being arranged to measure the gas flow and pressure downstream of the second choke 10. The third calibration branch 29 is provided with a third choke 12 and a third flow meter 13, the third flow meter 13 being adapted to measure the gas flow and pressure downstream the third choke 12. The fourth calibration branch 30 is provided with a fourth choke 14 and a fourth flow meter 15, the fourth flow meter 15 being arranged to measure the gas flow and pressure downstream the fourth choke 14. The output ends of the first flowmeter 9, the second flowmeter 11, the third flowmeter 13 and the fourth flowmeter 15 are connected with a data terminal 19, and the measured data are transmitted to the data terminal 19 for data acquisition and data processing.
The flow calibration system provided by the embodiment can calibrate the flow of a plurality of parallel throttles (such as a plurality of throttles with different apertures) at the same time, greatly reduces the flow calibration time of the throttles and saves the calibration cost.
Further, a plurality of throttles can set up respectively in a plurality of throttles installation frock, have made things convenient for a plurality of throttles installation and dismantlement. A plurality of throttles may also be integrated into one throttle installation tool.
According to the utility model discloses an embodiment, flow calibration system's demarcation flow is as follows:
s001: installing throttles to be calibrated (such as throttles with different apertures) on a throttle installation tool;
s002: evacuating the flow calibration system, e.g. to a vacuum of 10 deg.C -1 ～10 -3 Pa；
S003: starting a stabilized voltage power supply and a power distribution module;
s004: presetting a calibration pressure range and a pressure increase amplitude at a data terminal;
s005: the data terminal controls the high-pressure self-locking valve to be opened and controls the first pressure regulating electromagnetic valve and/or the second pressure regulating electromagnetic valve to regulate the outlet pressure of the gas cylinder to a calibration pressure initial value;
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 electromagnetic valve and/or the second pressure regulating electromagnetic valve;
s007: when the pressure measured by the low-pressure sensor reaches the initial value of the calibration pressure, the pressure 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: gas flows through a flow meter through a restrictor to be calibrated, the flow meter measures and records the outlet flow of the restrictor and transmits the measured value to a data terminal;
s009: the data terminal repeats the steps from S005 to S008 according to a preset pressure increasing range until a pressure value measured by the pressure of the low-pressure sensor reaches a target peak value, and finishes flow data acquisition;
s010: the data terminal automatically forms a table recording file by the acquired measurement pressure value and the corresponding flow, and draws a pressure-flow relation curve; s011: and turning off the power distribution module, the data terminal and the vacuum tank.
The utility model provides a flow calibration system can carry out automatic calibration to the throttle, and can satisfy the demand that the miniflow was markd to automatic acquisition draws pressure-flow curve, has realized the full automatization of demarcation flow.
The utility model discloses use gas to explain for measuring working medium to be not used for restricting this flow calibration system's application scope. The utility model provides a flow calibration system can mark liquid working medium equally. Also, the scope of application is not limited to electric propulsion systems.
The above embodiments of the present invention can be combined with each other, and have corresponding technical effects.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. Electric propulsion micro-flow calibration system, its characterized in that includes: 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 arranging a restrictor, and the flowmeter is used for measuring the gas flow rate downstream of the restrictor.
2. The flow calibration system of claim 1, further comprising the gas cylinder.
3. The flow calibration system of claim 1, wherein the first buffer tank inlet is provided with a porous diffusion structure for buffering gas entering the first buffer tank.
4. The flow calibration system of claim 3, further comprising a second surge tank disposed on the air supply line, the second surge tank disposed upstream of the first surge tank.
5. The flow calibration system as claimed in claim 2, wherein a high pressure self-locking valve is provided at an outlet of the gas cylinder for controlling the gas cylinder to supply gas to the gas supply pipeline.
6. The flow calibration system as claimed in claim 1, wherein the gas supply line is further provided with a first pressure regulating solenoid valve for regulating the gas pressure in the gas supply line; the first pressure regulating solenoid valve is arranged at the 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 disposed between the first surge tank and the choke.
8. The flow calibration system of claim 7, further comprising a data terminal; the flowmeter is connected with the data terminal and transmits the measured data to the data terminal.
9. The flow calibration system of claim 8, further comprising a power distribution module and a regulated power supply; the stabilized voltage power supply is connected with the power supply terminal of the power distribution module through a cable to provide electric quantity for the power distribution module; the output end of the power distribution module is connected with the first voltage regulating electromagnetic valve and the low-voltage sensor through signal wires so as to distribute power to the first voltage regulating electromagnetic valve and the low-voltage sensor; the input end of the power distribution module is connected with the data terminal; the data terminal is used for issuing an instruction to the first pressure regulating electromagnetic valve through the power distribution module so as to control the opening degree of the first pressure regulating electromagnetic valve and further control the gas flow of the gas supply pipeline; and the low-voltage 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, wherein the flow meter is connected downstream to a vacuum tank via a vacuum line; the vacuum pipeline is used for vacuumizing the flow calibration system, so that a vacuum environment is provided for calibration.
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| CN202221152475.9U CN217687422U (en) | 2022-05-13 | 2022-05-13 | Electric propulsion micro-flow calibration system |
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| CN202221152475.9U CN217687422U (en) | 2022-05-13 | 2022-05-13 | Electric propulsion micro-flow calibration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117091679A (en) * | 2023-10-20 | 2023-11-21 | 济宁市质量计量检验检测研究院(济宁半导体及显示产品质量监督检验中心、济宁市纤维质量监测中心) | Gas flowmeter calibrating device and method |
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2022
- 2022-05-13 CN CN202221152475.9U patent/CN217687422U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117091679A (en) * | 2023-10-20 | 2023-11-21 | 济宁市质量计量检验检测研究院(济宁半导体及显示产品质量监督检验中心、济宁市纤维质量监测中心) | Gas flowmeter calibrating device and method |
| CN117091679B (en) * | 2023-10-20 | 2024-03-22 | 济宁市质量计量检验检测研究院(济宁半导体及显示产品质量监督检验中心、济宁市纤维质量监测中心) | Gas flowmeter calibrating device and method |
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