CN207704275U - A kind of flow control system - Google Patents
A kind of flow control system Download PDFInfo
- Publication number
- CN207704275U CN207704275U CN201721834628.7U CN201721834628U CN207704275U CN 207704275 U CN207704275 U CN 207704275U CN 201721834628 U CN201721834628 U CN 201721834628U CN 207704275 U CN207704275 U CN 207704275U
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- nozzle
- flow
- pressure
- dimensional
- valve
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Abstract
The utility model discloses a kind of flow control systems, the system includes air source, thermometric framed bent, pressure measurement framed bent, pressure regulator valve and Composite Nozzle, air source is connected to by connecting line with Composite Nozzle by air source main valve and filter, pressure regulator valve is mounted on the connecting line between filter and Composite Nozzle, thermometric truss erection is in pressure regulator valve upstream, pressure measurement truss erection is in pressure regulator valve downstream, Composite Nozzle includes stable section, nozzle section and diffuser, nozzle section be the center three-dimensional nozzle that outer profile is cuboid and four using three-dimensional nozzle up and down four side walls as the combination of four two-dimensional nozzles of bottom wall, four gate valves up and down are installed in the inlet of nozzle section, to which four two-dimensional nozzle entrances are closed or be opened respectively, and the closing or opening of center three-dimensional nozzle are realized by left gate valve and right gate valve.The utility model solves the problems, such as that air flow rate large span degree of regulation is relatively low and control is inaccurate.
Description
Technical field
The utility model is related to a kind of flow control systems, especially a kind of flow control system suitable for gas.
Background technology
Common gas flow industrial at present is mainly coordinated with regulating valve using flowmeter or integrated flow regulator
It realizes, system adjustment precision depends on the precision of flowmeter, and existing gas flowmeter overall precision is not high, on the whole precision
5% or more, the flowmeter accuracy deviation of large span flow also coordinates regulating valve to be flowed 30% or more using orifice plate
What amount was adjusted, the degree of regulation of realization increases, but is limited to inevitable, the flow-rate adjustment of orifice throttle position flow fluctuation
Precision is not still high.Throttling cooperation pressure regulator valve is carried out using Venturi tube to realize flow-rate adjustment, this mode in addition, also having
The fluctuation of flowing is fundamentally avoided on pressure controlled influence, but is limited to the solidification of Flow Characteristic in Venturi Tube, in flow
Adjusting span requires pressure regulation valve regulation pressure span larger when larger, when pressure regulator valve pressure regulation spectrum exceeds its intrinsic pressure regulation
Regulation precision just reduces when characteristic, and the flow high-precision that cannot achieve under complete test operating mode is adjusted.
It is therefore desirable to design a kind of system accurately adjusted suitable for large span gas flow.
Utility model content
The utility model provides a kind of flow control system, which can realize that large span gas flow is adjusted, and ensure
Pressure regulator valve works in optimal voltage adjustment characteristic section, and the operating mode of suitable upstream and downstream gas pressure, temperature fluctuation, solves gas stream
Measure high-precision control problem.
The flow control system of the utility model includes air source, thermometric framed bent, pressure measurement framed bent, pressure regulator valve and Composite Nozzle,
The air source is connected to by connecting line with the Composite Nozzle by air source main valve and filter, and the pressure regulator valve is mounted on institute
It states on the connecting line between filter and the Composite Nozzle, the thermometric truss erection is described in the pressure regulator valve upstream
For pressure measurement truss erection in the pressure regulator valve downstream, the Composite Nozzle includes stable section, nozzle section and diffuser, the nozzle section
It is center three-dimensional nozzle that outer profile is cuboid and four using three-dimensional nozzle four two as bottom wall of four side walls up and down
The combination of first jet pipe is equipped with four gate valves up and down, so as to respectively to four in the inlet of the nozzle section
Two-dimensional nozzle entrance is closed or is opened, and the closing of center three-dimensional nozzle can be realized by left gate valve and right gate valve
Or it is open.
It is preferred that being equipped between the thermometric framed bent and the pressure regulator valve for being monitored to the bleed pressure
Pressure measurement framed bent.
It is preferred that five nozzle flow passages of the Composite Nozzle can realize supersonic flows.
Preferred center three-dimensional nozzle for realizing intermediate flow section be also the most frequently used operating condition of test flow be 10%~
50% control, top two-dimensional nozzle is with lower part two-dimensional nozzle for realizing the control of the flow ＜ 10% of small quantity operating condition of test
System, center three-dimensional nozzle are 50% for realizing the flow of big flow operating condition of test with right part two-dimensional nozzle and left part two-dimensional nozzle
~100% control
The utility model has the following advantages that compared with prior art：
(1) solve the problems, such as that air flow rate large span degree of regulation is relatively low；
(2) it is suitable for multiple gases type, including but not limited to air, adaptability is wider；
(3) amendment of pressure, temperature parameter can be provided, pressure, temperature change caused by gas atmo amount is vented are solved
The problem inaccurate to gas flow control.
Description of the drawings
Fig. 1 is the utility model flow control system schematic diagram.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1, gas control system described in the utility model includes mainly：Gas transmission main valve 1, filter 2, thermometric
Framed bent 3,1# pressure measurement framed bent 4, pressure regulator valve 5,2# pressure measurement framed bent 6, Composite Nozzle 7.Gas transmission main valve 1 is gas switch valve, control
The start and stop of experiment arrange that filter 2, filter 2 fall the contaminant filter in gas after gas transmission main valve 1, are to ensure by measuring
Sensor and regulating device cleaning gas, connection thermometric framed bent 3 after filter 2, mounting temperature sensor on thermometric framed bent 3 are used
In measuring gas total temperature, 1# pressure measurement framed bent 4 is installed after thermometric framed bent 3, pressure sensor is installed on 1# pressure measurement framed bent 4, for carrying
Pressure regulator valve 5, pressure regulator valve 5 are set after 1# pressure measurement framed bent 4 to determine that voltage adjustment characteristic provides input parameter for stagnation pressure before 5 valve of pressure regulator valve
Made according to the real-time regulating valve position of feedback applying pressure pid control parameter of pressure after and before the valve for gas pressure regulating device
Pressure reaches desired value, and pressure target value is obtained by the pressure and temperature signal acquired in real time through flow function real-time operation, adjusts
2# pressure measurement framed bent 6 is arranged after pressure valve 5, pressure sensor is installed on 2# pressure measurement framed bent 6, for providing stagnation pressure after 5 valve of pressure regulator valve, is
Pressure, which is adjusted, provides Real-time Feedback, Composite Nozzle 7 is arranged after 2# pressure measurement framed bent 6, Composite Nozzle 7 makes for controlling gas flow
Gas flow keeps stablizing, and stable downstream pressure environment is built in shielding downstream flow fluctuation, and Composite Nozzle 7 has multiple streams
Road may be implemented multigroup conjunction control in different flow section, air flow rate realized in the case where stream pressure remains unchanged
It adjusts.Gas flowing passes sequentially through gas transmission main valve 1, filter 2, thermometric framed bent 3,1# pressure measurement framed bent 4, pressure regulator valve 5,2# along pipeline
Pressure measurement framed bent 6, Composite Nozzle 7.The runner for determining Composite Nozzle according to test gas flow first, due to Composite Nozzle structure compared with
For complexity, it being given below the explanation of Composite Nozzle, Composite Nozzle totally five runners are located at Composite Nozzle center and surrounding,
Three-dimensional nozzle centered on center, center three-dimensional nozzle inner wall are axial symmetry, and outer wall is rectangular, and there is top in direction to outer wall up and down
Supersonic flows can be achieved in two-dimensional nozzle, lower part two-dimensional nozzle, left part two-dimensional nozzle, right part two-dimensional nozzle, five runners,
7 entrance of Composite Nozzle has gate valve, the runner for controlling Composite Nozzle 7, respectively upper gate valve, underthrust plate valve, left plate
Valve and right gate valve, the shape for being each responsible for top two-dimensional nozzle, lower part two-dimensional nozzle, left part two-dimensional nozzle and right part two-dimensional nozzle
State management and control forms centering wherein the valve plate of right gate valve and left gate valve can continue elongation to center three-dimensional nozzle entrance center
The state management and control of heart three-dimensional nozzle.Center three-dimensional nozzle is for realizing the flow that intermediate flow section is also the most frequently used operating condition of test
(10%~50%) it controls, top two-dimensional nozzle is with lower part two-dimensional nozzle for realizing the flow (＜ of small quantity operating condition of test
10%) control, center three-dimensional nozzle and right part two-dimensional nozzle and left part two-dimensional nozzle for realizing big flow operating condition of test stream
Amount control (50%~100%).In small flow test operating mode, right gate valve and left gate valve are closed until center ternary is sprayed
Tube inlet is closed, and small flow gas can be achieved in gate valve or underthrust plate valve (according to actual flow needs, can open simultaneously) in unlatching
Body flow control, when carrying out conventional typical test conditions, gate valve and underthrust plate valve in closing make right gate valve and left plate
Valve is half-open to be opened completely to center three-dimensional nozzle entrance, and right part two-dimensional nozzle and left part two-dimensional nozzle entrance are in and close shape
State, you can realize conventional type testing gas flow control using center three-dimensional nozzle.When need carry out greater flow gas stream
When amount adjusts experiment, right gate valve and left gate valve standard-sized sheet to center three-dimensional nozzle, right part two-dimensional nozzle and left part binary is made to spray
Tube inlet is opened completely, and runner is flowed out with supersonic flows at three, realizes greater flow Control experiment demand.By upper plate
Valve, underthrust plate valve, left gate valve and right gate valve are all opened completely, you can realize that runner is all with supersonic flows stream at five
Go out, realizes maximum stream flow Control experiment demand.Pressure regulator valve is determined after determining corresponding 7 runner of Composite Nozzle of experiment test flow
5 operation intervals, in the flow control system of the utility model, the best voltage adjustment characteristic section of pressure regulator valve is system pressure regulating work
Section determines pressure regulator valve Control PID control parameter further according to determining pressure regulation operation interval, is arranged according to thermometric framed bent 3,1# pressure measurement
Stagnation pressure calculates the corresponding goal pressure of target flow after total temperature stagnation pressure and valve before the valve that frame 4,2# pressure measurement framed bent 6 acquire, you can
The pressure after 5 valve of pressure regulator valve is set to be in adjusting target by controlling 5 spool position of pressure regulator valve and its corresponding goal pressure relationship
In neighbouring error band, forms pressure closed loop using PID and adjust.
There is gas compressibility, the flowing gas state in flowing can change with pressure and temperature, gas regulation
Device is adjusted mainly for gas pressure, is commonly encountered the case where upstream pressure is unstable, and gas expansion temperature reduces in the industry,
By flow signal gas pressure is adjusted in the way of ignore temperature change influence cannot achieve flow high-precision adjust.
Principle is as follows：
According to gas dynamics：
Gas flow is the function of the physical quantitys such as pressure, temperature, velocity coeffficient and area, and specific relationship is：
Wherein γ specific heats of gases ratio, R are gas constant, P0For gas stagnation pressure, T0For gas total temperature, A is sectional area, q (λ)
For flow function, λ is velocity coeffficient.
Flow function
It can be seen that gas flow and gas componant, the close phase such as gas pressure, gas temperature, velocity coeffficient and area
It closes, the compressibility of gas determines that its flowing has unstability, and fluctuation is inevitable, and degree of fluctuation directly affects flowing control
Precision processed, to realize that the high-precision control of gas flow has developed gas Flowrate Control System, basic principle is to use supersonic speed
Jet pipe throttles, and remains the characteristic of λ=1 during entirely being tested according to air-flow at supersonic speed throat, then using high-precision
Pressure regulator valve accurately adjusts gas pressure, and pressure and gas source temperature value feed back to high-precision and adjust before and after acquisition supersonic nozzle
Pressure valve realizes accurately controlling for gas flow, to realize that the best voltage adjustment characteristic of pressure regulator valve makes gas regulation pressure be in always most
The corresponding pressure regulation section of good voltage adjustment characteristic, has developed a set of Composite Nozzle, can be corresponding according to the different selections of gas flow
Runner ensures pressure regulation section, and can meet large span flow-rate adjustment demand.
Gas Flowrate Control System described in the utility model includes mainly：Gas transmission main valve, filter, thermometric framed bent, 1#
Pressure measurement framed bent, pressure regulator valve, 2# pressure measurement framed bent, Composite Nozzle.Gas transmission main valve is gas switch valve, the start and stop of Control experiment, mistake
Filter falls the contaminant filter in gas, to ensure to pass through measurement sensor and regulating device cleaning gas, pacifies on thermometric framed bent
Temperature sensor is filled, for measuring gas total temperature, pressure sensor is installed on 1# pressure measurement framed bents, it is total before pressure regulator valve valve for providing
Pressure, to determine that voltage adjustment characteristic provides input parameter, pressure regulator valve is gas pressure regulating device, according to the feedback of pressure after and before the valve
The real-time regulating valve position of applying pressure pid control parameter makes pressure reach desired value, pressure target value by the pressure that acquires in real time and
Temperature signal is obtained through flow function real-time operation, pressure sensor is installed on 2# pressure measurement framed bents, after providing pressure regulator valve valve
Stagnation pressure provides Real-time Feedback for pressure adjusting, and Composite Nozzle makes gas flow keep stablizing, shielding for controlling air flow rate
Downstream flow fluctuates, and builds stable downstream pressure environment, and Composite Nozzle has multiple runners, different flow section may be implemented
Multigroup conjunction control, in the case where stream pressure remains unchanged realize air flow rate adjusting.
The step of flow control system according to the present utility model is adjusted include：
Step 1: presetting pressure regulation valve opening according to flow needed for experiment；
Step 2: correspond to the slotting of jet pipe or jet pipe combination in opening five jet pipes of Composite Nozzle according to flow needed for experiment
Plate valve；
Step 3: open main valve, the data fed back according to thermometric framed bent and the pressure measurement framed bent in pressure regulator valve downstream and opened
The jet pipe situation put calculates the difference of actual flow and flow needed for experiment；
Step 4: according to step 3 difference, adjusts the aperture of pressure regulator valve to the exact value of experiment；
Step 5: starting to test.
The content not being described in detail in the utility model specification belongs to the known technology of those skilled in the art.
Claims (4)
1. a kind of flow control system, it is characterised in that：Including air source, thermometric framed bent, pressure measurement framed bent, pressure regulator valve and compound spray
Pipe, the air source are connected to by connecting line with the Composite Nozzle by air source main valve and filter, the pressure regulator valve installation
On connecting line between the filter and the Composite Nozzle, the thermometric truss erection in the pressure regulator valve upstream,
For the pressure measurement truss erection in the pressure regulator valve downstream, the Composite Nozzle includes stable section, nozzle section and diffuser, the spray
Pipeline section be the center three-dimensional nozzle that outer profile is cuboid and four using three-dimensional nozzle up and down four side walls as the four of bottom wall
The combination of a two-dimensional nozzle is equipped with four gate valves up and down in the inlet of the nozzle section, to respectively to four
Two-dimensional nozzle entrance is closed or is opened, and is realized the closing of center three-dimensional nozzle by left gate valve and right gate valve or opened
It puts.
2. flow control system as described in claim 1, it is characterised in that：Between the thermometric framed bent and the pressure regulator valve
Pressure measurement framed bent for being monitored to the bleed pressure is installed.
3. flow control system as described in claim 1, it is characterised in that：Five equal energy of nozzle flow passage of the Composite Nozzle
Enough realize supersonic flows.
4. flow control system as claimed in any one of claims 1-3, it is characterised in that：Center three-dimensional nozzle for realizing
Intermediate flow section is also the control that the flow of the most frequently used operating condition of test is 10%~50%, top two-dimensional nozzle and lower part binary
Jet pipe is for realizing the control of the flow ＜ 10% of small quantity operating condition of test, center three-dimensional nozzle and right part two-dimensional nozzle and left part
The control that two-dimensional nozzle is 50%~100% for realizing the flow of big flow operating condition of test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721834628.7U CN207704275U (en) | 2017-12-25 | 2017-12-25 | A kind of flow control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721834628.7U CN207704275U (en) | 2017-12-25 | 2017-12-25 | A kind of flow control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207704275U true CN207704275U (en) | 2018-08-07 |
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ID=63028295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721834628.7U Expired - Fee Related CN207704275U (en) | 2017-12-25 | 2017-12-25 | A kind of flow control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207704275U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954290A (en) * | 2019-12-09 | 2020-04-03 | 中国航天空气动力技术研究院 | Automatic adjusting system and method for wind tunnel jet test pressure |
-
2017
- 2017-12-25 CN CN201721834628.7U patent/CN207704275U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954290A (en) * | 2019-12-09 | 2020-04-03 | 中国航天空气动力技术研究院 | Automatic adjusting system and method for wind tunnel jet test pressure |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180807 Termination date: 20181225 |
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| CF01 | Termination of patent right due to non-payment of annual fee |