CN112096695B - Flow monitoring system and flow monitoring method - Google Patents
Flow monitoring system and flow monitoring method Download PDFInfo
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- CN112096695B CN112096695B CN202011062547.6A CN202011062547A CN112096695B CN 112096695 B CN112096695 B CN 112096695B CN 202011062547 A CN202011062547 A CN 202011062547A CN 112096695 B CN112096695 B CN 112096695B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
Abstract
The invention discloses a flow monitoring system and a flow monitoring method, and relates to the technical field of flow monitoring. The flow monitoring system includes a liquid inlet, a liquid outlet, a first range flow meter, and a second range flow meter. At least two branch flow paths are arranged between the liquid inlet and the liquid outlet; the range of the first range flow meter is larger than that of the second range flow meter; the first measuring range flowmeter is arranged on a confluence flow path of at least two branch flow paths, the second measuring range flowmeter is arranged on one branch flow path, and when the liquid flow is within the measuring range of the second measuring range flowmeter, the liquid only passes through the branch flow path where the second measuring range flowmeter is located; when the liquid flow is larger than the range of the second range flowmeter, the liquid returns to the confluence flow path after being divided by at least two branch flow paths. The flow monitoring system can monitor the whole process of continuous change of the liquid flow from small to large, and is beneficial to the flow characteristic test of valve products.
Description
Technical Field
The invention relates to the technical field of flow monitoring, in particular to a flow monitoring system and a flow monitoring method.
Background
In the operation process of the hydraulic system, the continuous change process of the flow from small to large is often required to be monitored, for example, in a P/Q characteristic test of the overflow valve, the small flow range of the overflow valve is required to be concerned to evaluate the opening rate and the closing rate of the overflow valve, and the large flow range of the overflow valve is required to evaluate the pressure gain of the overflow valve in a large flow section. The volumetric flowmeter is widely used in the industry due to high measurement stability and high measurement precision, however, the large-range volumetric flowmeter usually has overlarge volume corresponding to a single flow pulse signal, and a small flow section of the large-range volumetric flowmeter usually has a monitoring blind area; the small-range volumetric flowmeter cannot acquire a large-flow section due to the limitation of the rotating speed, so that the conventional volumetric flowmeter cannot realize full-range high-precision continuous acquisition of the flow from small to large.
At present, for testing large-flow full-range flow collection, a plurality of flow branches are generally respectively provided with different-range flow meters for sectional collection, oil needs to be stopped to flow after small-flow section collection in the collection process, then an oil way is switched to a large-flow branch for large-flow section collection, and finally the whole flow range is covered. Conventional sectional flow collection cannot continuously perform high-precision flow collection, the consistency of initial input of flow at each time cannot be guaranteed, and continuous change connection of flow and pressure cannot be guaranteed due to oil circuit switching.
Disclosure of Invention
The invention aims to provide a flow monitoring system and a flow monitoring method, which are used for realizing continuous monitoring of liquid flow and ensuring the continuity and integrity of monitoring data.
In order to achieve the purpose, the invention adopts the following technical scheme:
a flow monitoring system, comprising:
a liquid inlet and a liquid outlet, with at least two branch flow paths disposed between the liquid inlet and the liquid outlet;
the system comprises a first range flow meter and a second range flow meter, wherein the range of the first range flow meter is larger than that of the second range flow meter;
the first range flow meter is arranged on a confluence flow path of at least two branch flow paths, the second range flow meter is arranged on one branch flow path, and when the liquid flow is within the range of the second range flow meter, the liquid only passes through the branch flow path where the second range flow meter is located; when the liquid flow is larger than the range of the second range flowmeter, the liquid returns to the confluence flow path after being divided by at least two branch flow paths.
Optionally, the first range flow meter and the second range flow meter are both positive displacement flow meters, and both have an effective range overlap region.
Optionally, the first range flow meter has a minimum identified flow rate and the second range flow meter has a maximum flow rate, the maximum flow rate being greater than the minimum identified flow rate.
Optionally, the branch flow path provided with the second range flow meter further includes a speed regulating valve, the speed regulating valve is disposed between the liquid inlet and the second range flow meter, and the speed regulating valve is configured to limit a maximum flow rate of liquid passing through the second range flow meter and establish a back pressure required to communicate with other branch flow paths.
Optionally, a pilot operated check valve is arranged on each of the other branch flow paths, and the pilot operated check valve is used for controlling the disconnection and the communication of the branch flow path in which the pilot operated check valve is located.
Optionally, a throttling valve is further disposed on the other branch flow path, and the throttling valve is disposed between the liquid inlet and the hydraulic control one-way valve.
Optionally, a first check valve is further disposed between the liquid inlet and the branch flow path, and the first check valve is configured to prevent backflow of the liquid.
Optionally, a second check valve is further disposed on the merged flow path, and the second check valve is disposed between the first range flowmeter and the liquid outlet to prevent liquid at the liquid outlet from flowing back.
Optionally, the system further comprises a data processing module, wherein the data processing module is electrically connected with the first range flow meter and the second range flow meter, and the data processing module can output the monitoring values of the first range flow meter and the second range flow meter.
A flow monitoring method applies any one of the flow monitoring systems, when the liquid flow monitored by a first range flow meter is smaller than the maximum liquid flow of a second range flow meter, the monitoring value of the second range flow meter is the actual liquid flow value; when the liquid flow monitored by the first measuring range flowmeter is larger than the maximum liquid flow of the second measuring range flowmeter, the monitoring value of the first measuring range flowmeter is the actual liquid flow value.
The invention has the beneficial effects that:
the flow monitoring system provided by the invention has the advantages that at least two branch flow paths are arranged between the liquid inlet and the liquid outlet, the first measuring range flowmeter is arranged on the confluence flow path of the at least two branch flow paths, the second measuring range flowmeter is arranged on one branch flow path, and the measuring range of the first measuring range flowmeter is larger than that of the second measuring range flowmeter. When the liquid flow is in the range of the second range flowmeter, the liquid only passes through the branch flow path where the second range flowmeter is located, and the liquid flow is monitored by the second range flowmeter; when the liquid flow is larger than the range of the second range flowmeter, the liquid returns to the confluence flow path after being divided by at least two branch flow paths, and the liquid flow is monitored by the first range flowmeter. The flow monitoring system provided by the invention realizes the whole-process monitoring of the liquid flow, can monitor the whole process of the continuous change of the liquid flow from small to large, and is beneficial to the flow characteristic test of valve products.
The flow monitoring method provided by the invention adopts the flow monitoring system, so that the continuity and the integrity of the monitoring data are ensured, and the measurement precision of the monitoring system is improved.
Drawings
FIG. 1 is a schematic diagram of a flow monitoring system provided by an embodiment of the present invention;
fig. 2 is a time-varying trend graph of the flow rate provided by the embodiment of the invention.
In the figure:
1. a first check valve; 2. a second one-way valve; 3. a first range flow meter; 4. a second range flow meter; 5. a speed regulating valve; 6. a throttle valve; 7. a hydraulic control one-way valve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, the present embodiment provides a flow monitoring system comprising a liquid inlet P, a liquid outlet T, a first range flow meter 3 and a second range flow meter 4. At least two branch flow paths are arranged between the liquid inlet P and the liquid outlet T; the range of the first range flow meter 3 is larger than the range of the second range flow meter 4; the first range flowmeter 3 is arranged on a confluence flow path of at least two branch flow paths, the second range flowmeter 4 is arranged on one branch flow path, and when the liquid flow is within the range of the second range flowmeter 4, the liquid only passes through the branch flow path where the second range flowmeter 4 is positioned; when the liquid flow rate is larger than the range of the second range flowmeter 4, the liquid returns to the confluence flow path after being split by at least two branch flow paths.
In the flow monitoring system provided by this embodiment, at least two branch flow paths are provided between the liquid inlet P and the liquid outlet T, the first-range flow meter 3 is provided on a merging flow path of the at least two branch flow paths, the second-range flow meter 4 is provided on one of the branch flow paths, and the range of the first-range flow meter 3 is greater than the range of the second-range flow meter 4. When the liquid flow is in the range of the second range flow meter 4, the liquid only passes through the branch flow path where the second range flow meter 4 is located, and the liquid flow is monitored by the second range flow meter 4; when the liquid flow rate is larger than the range of the second range flowmeter 4, the liquid returns to the confluence flow path after being divided by at least two branch flow paths, and the liquid flow rate is monitored by the first range flowmeter 3. The flow monitoring system provided by the invention realizes the whole-process monitoring of the liquid flow, can monitor the whole process of the continuous change of the liquid flow from small to large, and is beneficial to the flow characteristic test of valve products.
Optionally, the first range flow meter 3 and the second range flow meter 4 are both positive displacement meters and have an effective range overlap region. The first measuring range flowmeter 3 and the second measuring range flowmeter 4 have effective measuring range overlapping areas, so that calibration can be performed on the two flowmeters, and the accuracy of the whole flow monitoring system can be maintained. When the liquid flow rate is within the range of the second range flow meter 4, the liquid passes through the branch flow path where the second range flow meter 4 is located, flows into the merging flow path, and flows out from the liquid outlet T. The second measuring range flowmeter 4 and the first measuring range flowmeter 3 can acquire liquid flow, the precision of the second measuring range flowmeter 4 can be calibrated firstly, and then the precision of the first measuring range flowmeter 3 is calibrated by the measuring range overlapping area of the second measuring range flowmeter and the first measuring range flowmeter; or the precision of the first measuring range flowmeter 3 can be calibrated firstly, and then the precision of the second measuring range flowmeter 4 can be calibrated by the measuring range overlapping area of the first measuring range flowmeter and the second measuring range flowmeter.
Alternatively, as shown in fig. 2, the first range flow meter 3 has a minimum identified flow rate and the second range flow meter 4 has a maximum flow rate, the maximum flow rate being greater than the minimum identified flow rate. In this embodiment, the minimum identification flow rate is denoted as Q1, and the maximum liquid flow rate is denoted as Q2. The first-range flowmeter 3 is a large-range volumetric flowmeter, and the second-range flowmeter 4 is a small-range volumetric flowmeter. The large-range positive displacement flowmeter usually has overlarge volume corresponding to a single flow pulse signal, a monitoring blind area usually exists in a small flow section, and the minimum identification flow is the minimum flow which can be identified by the large-range flowmeter and can ensure the acquisition precision. The small-range positive displacement flowmeter cannot acquire a large-flow section due to the limitation of the rotating speed, and the maximum liquid flow is the maximum liquid flow which is set for protecting the small-range flowmeter from flow excess. The minimum identification flow rate Q1 of the first-range flowmeter 3 is set to be smaller than the maximum liquid flow rate Q2 of the second-range flowmeter 4, so that the effective range overlapping area of the first-range flowmeter 3 and the second-range flowmeter 4 is between Q1 and Q2, and when the liquid flow rate is between Q1 and Q2, calibration alignment of the first-range flowmeter 3 and the second-range flowmeter 4 can be realized.
In the present embodiment, the flow monitoring system is used for monitoring the flow of oil in the hydraulic system, and two branch flow paths are provided. The two branch flow paths are respectively referred to as a first branch flow path and a second branch flow path. The second range flow meter 4 is provided on the first branch flow path, and the other branch flow path is a second branch flow path. The second range flowmeter 4 of the first branch flow path is used for collecting small flow changes, the first range flowmeter 3 of the confluence flow path is used for collecting large flow changes, and the effective range coincidence regions of the first range flowmeter 3 and the second range flowmeter 4 are used for data connection and mutual calibration of the flowmeters, so that the continuity and integrity of monitoring data are ensured, the measurement accuracy of a monitoring system is improved, and the high-accuracy continuous collection of liquid flow from a small flow section to a large flow section is realized.
Of course, in other embodiments, if the monitored liquid flow range is large, the flow capacities of the two branch flow paths cannot meet the use requirement, and three branch flow paths or more branch flow paths may be provided according to actual requirements.
Optionally, the branch flow path provided with the second range flow meter 4 further includes a speed regulating valve 5, the speed regulating valve 5 is disposed between the liquid inlet P and the second range flow meter 4, and the speed regulating valve 5 is used for limiting the maximum flow rate of the liquid passing through the second range flow meter 4 and establishing a back pressure required for communicating with other branch flow paths. In this embodiment, the speed control valve 5 is provided in the first branch flow path, and the speed control valve 5 can control the flow rate of the liquid passing through the first branch flow path to be within the effective range of the second range flow meter 4, thereby avoiding the failure of the second range flow meter 4 caused by the fact that the flow rate of the liquid passing through the second range flow meter 4 exceeds the maximum liquid flow rate Q2.
Optionally, a pilot operated check valve 7 is disposed on each of the other branch flow paths, and the pilot operated check valve 7 is used for controlling the disconnection and the communication of the branch flow path in which the pilot operated check valve 7 is located. In this embodiment, the pilot-operated check valve 7 is provided in the second branch flow path, the speed control valve 5 in the first branch flow path is provided with a minimum back pressure communicated with the second branch flow path, when the liquid flow rate Q is less than Q2, the back pressure of the liquid passing through the speed control valve 5 is small, the back pressure is smaller than the minimum back pressure communicated with the second branch flow path and is insufficient to push open the pilot-operated check valve 7, the second branch flow path is disconnected, the liquid passes through only the first branch flow path, and the second range flow meter 4 monitors the liquid flow rate. When the liquid flow rate Q is greater than Q2, the liquid generates enough back pressure when flowing through the speed regulating valve 5, the back pressure is larger than the minimum back pressure communicated with the second branch flow path, and is enough to push away the pilot operated check valve 7, at this time, the liquid is divided into two parts after flowing in from the liquid inlet P, one part still flows through the first branch flow path, and the part of the liquid flow rate is limited in the effective range of the second range flow meter 4 by the speed regulating valve 5; the other part of the liquid flows through the second branch flow path, the two parts of the liquid flow through the first measuring range flowmeter 3 after being converged on the converging flow path and finally flows out from the liquid outlet T, and at the moment, the liquid flow is large, so that the effective and high-precision monitoring of the first measuring range flowmeter 3 is achieved, and the flow monitoring needs to be carried out through the first measuring range flowmeter 3.
Optionally, a throttle valve 6 is further disposed on the other branch flow path, and the throttle valve 6 is disposed between the liquid inlet P and the pilot operated check valve 7. In this embodiment, the second branch flow path is further provided with a throttle valve 6, and the arrangement of the throttle valve 6 ensures that the hydraulic control check valve 7 on the second branch flow path is stably opened, so that the phenomenon that the hydraulic control check valve 7 is suddenly opened and suddenly closed due to unstable liquid flow is avoided, and the monitoring of the first range flowmeter 3 is unstable. Of course, in other embodiments, a sequence valve or a stabilizing valve may be disposed on the second branch flow path, and the sequence valve or the stabilizing valve ensures the stable opening of the pilot-controlled check valve 7.
According to the flow monitoring system provided by the embodiment, the automatic opening and closing of the second branch flow path is realized through the flow-limiting back pressure of the first branch flow path when the liquid flow changes, and the stable pressure change of the automatic opening and closing of the second branch flow path is ensured through the through-flow pressure matching of the throttle valve 6 and the speed regulating valve 5.
Optionally, a first check valve 1 is further disposed between the liquid inlet P and the at least two branch flow paths, and the first check valve 1 is used for preventing liquid from flowing back. The first check valve 1 is arranged between the liquid inlet P and the first branch flow path and the second branch flow path, the first check valve 1 is arranged so that liquid entering from the liquid inlet P passes through the first branch flow path or the first branch flow path and the second branch flow path, enters the confluence flow path and flows out from the liquid outlet T, the first range flow meter 3 and the second range flow meter 4 detect the liquid flow, the liquid entering the first branch flow path and the second branch flow path is prevented from flowing back, and therefore deviation between the flow monitored by the first range flow meter 3 and the second range flow meter 4 and the actual liquid flow is influenced.
Optionally, a second check valve 2 is further disposed on the merged flow path, and the second check valve 2 is disposed between the first range flow meter 3 and the liquid outlet T to prevent liquid at the liquid outlet T from flowing back. In the present embodiment, the second check valve 2 is provided between the first range flow meter 3 and the liquid outlet T, so that the liquid passing through the first range flow meter 3 does not flow back, which affects the monitoring accuracy of the first range flow meter 3.
Optionally, the system further comprises a data processing module, wherein the data processing module is electrically connected with the first range flow meter 3 and the second range flow meter 4, and the data processing module can output the monitoring values of the first range flow meter 3 and the second range flow meter 4. In this embodiment, the first range flow meter 3 and the second range flow meter 4 transmit the monitored flow values to the data processing module, which processes the received data and outputs a trend graph of flow over time (as shown in fig. 2). It should be noted that, the receiving and processing of data by the data processing module are already the prior art, and are not described herein again.
The working principle of the flow monitoring system provided by this embodiment is as follows: when the liquid flow rate Q is less than Q2, the back pressure of the liquid passing through the speed control valve 5 is small and is not enough to push the pilot operated check valve 7 open through the throttle valve 6, the second branch flow path is disconnected, the liquid passes through only the first branch flow path, and the second range flow meter 4 monitors the liquid flow rate. When the liquid flow Q is greater than Q2, the liquid generates enough back pressure when flowing through the speed regulating valve 5 to push the pilot operated check valve 7 open through the throttle valve 6, and the liquid is divided into two parts after flowing in from the liquid inlet P, one part still flows through the first branch flow path, and the part of the liquid flow is limited in the effective range of the second range flow meter 4 by the speed regulating valve 5; the other part of the liquid flows through the second branch flow path, the two parts of the liquid flow through the first range flow meter 3 after being merged on the merged flow path, and finally flows out from the liquid outlet T, and the first range flow meter 3 monitors the flow rate.
The embodiment also provides a flow monitoring method, wherein by applying the flow monitoring system, when the liquid flow monitored by the first measuring range flowmeter 3 is smaller than the maximum liquid flow of the second measuring range flowmeter 4, the monitoring value of the second measuring range flowmeter 4 is the actual liquid flow value; when the liquid flow monitored by the first range flowmeter is larger than the maximum liquid flow of the second range flowmeter 4, the monitoring value of the first range flowmeter 3 is the actual liquid flow value. In the present embodiment, as shown in fig. 2, the trend of the flow rate monitored throughout the first-range flow meter 3 with time is shown as O2S2, the trend of the flow rate monitored throughout the second-range flow meter 4 with time is shown as O1S1, and when the change of the liquid flow rate is smaller than Q2, the flow rate of the liquid is based on the monitored value of the second-range flow meter 4; when the change of the liquid flow rate is larger than Q2, the flow rate of the liquid is based on the monitoring value of the first-range flow meter 3.
The flow monitoring method provided by the embodiment, by applying the flow monitoring system, ensures the continuity and integrity of the monitoring data, and improves the measurement accuracy of the monitoring system.
The above description is only a preferred embodiment of the present invention, and it should not be understood that the present invention is limited to the details of the embodiment and the range of applications, which can be changed by those skilled in the art according to the spirit of the present invention.
Claims (10)
1. A flow monitoring system, comprising:
a liquid inlet and a liquid outlet, with at least two branch flow paths disposed between the liquid inlet and the liquid outlet;
a first range flow meter (3) and a second range flow meter (4), the range of the first range flow meter (3) being greater than the range of the second range flow meter (4);
the first range flow meter (3) is arranged on a confluence flow path of at least two branch flow paths, the second range flow meter (4) is arranged on one branch flow path, and when the flow rate of the liquid is within the range of the second range flow meter (4), the liquid only passes through the branch flow path where the second range flow meter (4) is arranged; when the liquid flow is larger than the range of the second range flowmeter (4), the liquid returns to the confluence flow path after being divided by at least two branch flow paths.
2. The flow monitoring system of claim 1 wherein the first range flow meter (3) and the second range flow meter (4) are positive displacement flow meters and have an effective range overlap region.
3. The flow monitoring system according to claim 2, wherein the first range flow meter (3) has a minimum identified flow rate and the second range flow meter (4) has a maximum flow rate, the maximum flow rate being greater than the minimum identified flow rate.
4. The flow monitoring system according to claim 1, further comprising a speed valve (5) in the branch flow path in which the second range flow meter (4) is disposed, the speed valve (5) being disposed between the liquid inlet and the second range flow meter (4), the speed valve (5) being configured to limit the maximum flow of liquid through the second range flow meter (4) and to establish a back pressure required to communicate with the other branch flow paths.
5. A flow monitoring system according to claim 4, characterised in that pilot operated check valves (7) are provided in the other branch flow paths, said pilot operated check valves (7) being adapted to control the disconnection and communication of the branch flow path in which they are located.
6. A flow monitoring system according to claim 5, characterised in that a throttle valve (6) is arranged in the other branch flow path, said throttle valve (6) being arranged between the liquid inlet and the pilot operated check valve (7).
7. A flow monitoring system according to any of claims 1-6, characterised in that a first non return valve (1) is arranged between the liquid inlet and the branch flow path, said first non return valve (1) being arranged to prevent backflow of the liquid.
8. A flow monitoring system according to any of claims 1-6, characterised in that a second non return valve (2) is arranged in the merged flow path, said second non return valve (2) being arranged between the first range flow meter (3) and the liquid outlet for preventing liquid backflow from the liquid outlet.
9. The flow monitoring system according to any one of claims 1-6, further comprising a data processing module electrically connected to the first range flow meter (3) and the second range flow meter (4), the data processing module being capable of outputting monitored values of the first range flow meter (3) and the second range flow meter (4).
10. A flow rate monitoring method, characterized in that, when the flow rate of the liquid monitored by the first-range flow meter (3) is less than the maximum liquid flow rate of the second-range flow meter (4), the monitored value of the second-range flow meter (4) is the actual value of the liquid flow rate by using the flow rate monitoring system as claimed in any one of claims 1 to 9; when the liquid flow monitored by the first range flowmeter (3) is larger than the maximum liquid flow of the second range flowmeter (4), the monitoring value of the first range flowmeter (3) is the actual liquid flow value.
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| CN113995894A (en) * | 2021-10-15 | 2022-02-01 | 中南大学湘雅医院 | Novel adjustable multifunctional cerebrospinal fluid external drainage fixed monitoring device and method |
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| GB2376080B (en) * | 2001-05-30 | 2004-08-04 | Micro Motion Inc | Flowmeter proving device |
| CN100573083C (en) * | 2008-01-29 | 2009-12-23 | 北京理工大学 | The device and method that is used for the continuous coverage of pneumatic pressure-release valve discharge characteristic |
| KR101495197B1 (en) * | 2013-09-27 | 2015-02-26 | 주식회사 에네스지 | An apparatus to test a mechanical trip valve of emergency trip system for the turbine of an generator and method to test it |
| GB2521464A (en) * | 2013-12-20 | 2015-06-24 | Mincon Internat | Flow monitoring system |
| JP2017181214A (en) * | 2016-03-29 | 2017-10-05 | 岩谷産業株式会社 | Adjusted gas flowmeter |
| CN109724659B (en) * | 2017-10-31 | 2024-01-16 | 宁波方太厨具有限公司 | Gas flow testing system and testing method for kitchen range |
| CN208348214U (en) * | 2018-04-25 | 2019-01-08 | 世特科汽车工程产品（常州）有限公司 | A kind of portable electronic pump performance test stand |
| CN109682433A (en) * | 2019-01-03 | 2019-04-26 | 山东威高集团医用高分子制品股份有限公司 | A kind of oxygen flow monitoring device |
| CN110608891B (en) * | 2019-09-04 | 2024-03-26 | 陕西蓝箭航天技术有限公司 | Cold flow test system of liquid rocket engine and parallel storage tank propellant conveying balance performance test method |
| CN110926755B (en) * | 2019-12-03 | 2021-11-16 | 中国科学院近代物理研究所 | Visual test system |
| CN111456983A (en) * | 2020-04-17 | 2020-07-28 | 中铁隧道局集团有限公司 | Hydraulic speed regulating valve detection analysis method based on wavelet analysis |
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