CN117167661A - Multi-loop flow control system and adjusting method - Google Patents
Multi-loop flow control system and adjusting method Download PDFInfo
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- CN117167661A CN117167661A CN202311097773.1A CN202311097773A CN117167661A CN 117167661 A CN117167661 A CN 117167661A CN 202311097773 A CN202311097773 A CN 202311097773A CN 117167661 A CN117167661 A CN 117167661A
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Abstract
The application discloses a multi-loop flow control system and an adjusting method, wherein the system comprises a main pipeline, a bypass pressure stabilizing branch and a plurality of test branches; the bypass voltage stabilizing branch and the plurality of test branches are connected with the main pipeline in parallel, and the bypass voltage stabilizing branch is positioned between the main pipeline and the plurality of test branches; the bypass pressure stabilizing branch and the main pipeline form a front pressure stabilizing loop, a pressure control valve is arranged on the bypass pressure stabilizing branch, and the pressure of the front pressure stabilizing loop is stabilized through the pressure control valve. The multi-loop flow control system and the adjusting method can improve the stability of the system.
Description
Technical Field
The application relates to the technical field of multichannel flow control, in particular to a multi-loop flow control system and an adjusting method.
Background
Aiming at the procedures of electrolytic tank, fuel cell activation screening, endurance test and the like, a large amount of material tests are required to be simultaneously carried out, the efficiency of a single system is low, and the test development efficiency can be greatly improved by using a multi-channel test system. The multiple tested pieces are tested in the same system, the operation conditions of each tested piece are different, and the required flow control is different.
On the one hand, the existing multi-channel system of the electrolytic tank adopts a busbar to carry out natural diversion control, the flow distribution is relatively fixed, the uniformity of the flow distribution is influenced by a measured piece, and the measurement and control of the flow of each channel cannot be accurately carried out. On the other hand, in the existing multi-channel system of the electrolytic tank, channel flow adjustment is carried out by adopting each channel adjusting valve, but all channels can interfere with each other in adjustment, so that the flow adjustment of all channels is coupled, and stable flow control of all channels cannot be realized.
In the prior art, the patent publication No. CN110822778A discloses a multi-path pressure flow constant water cooling system for a test platform and an application method thereof, wherein a variable-frequency water pump is adopted to control loop pressure so as to stabilize main path pressure, and the opening of each branch ball valve is regulated by passing through each branch PID. However, the method has the advantages that the main circuit pressure and the branch circuit flow control are coupled in control, and the rapid flow regulation of each branch circuit cannot be realized.
Disclosure of Invention
The technical problems to be solved by the application are as follows: solves the problem that the flow control of each channel is unstable in the existing multi-channel system of the electrolytic tank.
In order to solve the technical problems, the application provides the following technical scheme:
a multi-circuit flow control system comprising a main conduit (100), a bypass pressure stabilizing branch (200) and a plurality of test branches (300); the bypass voltage stabilizing branch circuit (200) and the plurality of test branch circuits (300) are connected with the main pipeline (100) in parallel, and the bypass voltage stabilizing branch circuit (200) is positioned between the main pipeline (100) and the plurality of test branch circuits (300);
the bypass pressure stabilizing branch circuit (200) and the main pipeline (100) form a preposed pressure stabilizing loop (I), a pressure control valve (210) is arranged on the bypass pressure stabilizing branch circuit (200), and the pressure of the preposed pressure stabilizing loop (I) is stabilized through the pressure control valve (210).
The advantages are that: through the design bypass steady voltage branch road, the control pressure control valve's regulation is than wide, can be when the large tracts of land flow changes, and the change of flow when each test branch road flow is adjusted is absorbed in quick self-operated regulation, keeps test branch road import pressure stable, avoids the mutual interference between the passageway, reduces the coupling on the flow regulation, improves system stability and control accuracy.
In one embodiment of the application, the main pipeline (100) comprises a circulating water tank (110), a circulating water pump (120) and a main pipeline flowmeter (130) which are sequentially connected with an outlet of the circulating water tank (110).
In one embodiment of the application, the outlet pipe section of the main pipeline flowmeter (130) is branched, one pipe is connected with a bypass pressure stabilizing branch (200) in a pipe joint manner, and the other pipe is connected with a plurality of test branches (300) in a pipe joint manner; the main conduit (100) further comprises a pressure testing device (140), the pressure testing device (140) being located on a section of the main conduit flow meter (130) before the outlet section diverges.
In an embodiment of the application, the inlet (2162) of the pressure control valve (210) is connected with the outlet pipe section of the main pipe flowmeter (130), and the outlet (2172) of the pressure control valve (210) is connected with the inlet of the circulation tank (110); an air inlet (2121) of the pressure control valve (210) is connected to an air source.
In an embodiment of the present application, a gas source pressure (Px) of the gas source and a loop pressure (P0) of the pre-pressure stabilizing loop (I) respectively act on two sides of a diaphragm (218) of the pressure control valve (210), and the gas source pressure (Px) and the loop pressure (P0) are in a pressure balance state.
In one embodiment of the application, each of the test branches (300) includes a branch regulating valve (310) coupled to an outlet of the main pipeline flow meter (130), and a branch flow meter (320) coupled to an outlet of the branch regulating valve (310); an outlet of the bypass flow meter (320) is connected with an inlet of the circulating water tank (110).
In one embodiment of the present application, the multi-loop flow control system further comprises a controller (400), wherein the controller (400) comprises a plurality of branch PID control modules (410), a bypass branch control module (420) and a main pipeline control module (430);
the branch PID control modules (410) are respectively connected with the branch regulating valves (310) and the branch flowmeters (320) on the test branches (300) in a communication way, and the valve opening of the branch regulating valves (310) on each branch is regulated;
the bypass branch control module (420) is in communication connection with the pressure control valve (210) and adjusts the regulating ratio width of the pressure control valve (210);
the main pipeline control module (430) is in communication connection with the circulating water pump (120) and the main pipeline flowmeter (130) and adjusts the rotating speed of the circulating water pump (120).
In one embodiment of the application, when the system flow is coarsely regulated, the valve flow through the pressure control valve (210) and the bypass regulating valve (310) is:
wherein q is expressed as the valve flow through the valve body, A 0 Expressed as valve port flow area, C q Expressed as a flow coefficient, Δp expressed as a pressure difference between the front and rear of the valve port, ρ expressed as a liquid density;
the bypass branch control module (420) and the plurality of branch PID control modules (410) adjust the regulating ratio width of the pressure control valve (210) and the valve opening of the branch regulating valve (310) according to the valve flow.
In one embodiment of the present application, when the bypass PID control module (410) precisely controls the flow rate on each test bypass, the flow rate on each test bypass is obtained by the following formula:
where u (n) is expressed as the flow value on the current branch, K p Expressed as a proportionality coefficient, K i Expressed as integral coefficient, K d Expressed as differential coefficient, err (n) expressed as deviation of preset value from control amount, n expressed as current data, n-1 expressed as last data, err (k) expressed as k=0, and a summation error of n;
and adjusting the valve opening of the branch regulating valve (310) on each test branch according to the flow on each test branch.
A method of regulating a multi-circuit flow control system according to the above, comprising:
when the system operates under a stable working condition, the pressure control valve (210) and the front and back valve pressures of the branch regulating valves (310) on each test branch are stable, and the regulating ratio width of the pressure control valve (210) and the valve opening of the branch regulating valves (310) on each test branch are kept;
when part of the test branches are subjected to working condition switching, the test branches are subjected to flow regulation by regulating branch regulating valves (310) according to requirements, the total flow capacity of each test branch is changed at the moment, and the air source pressure (Px) of the pressure control valve (210) is regulated, so that the air source pressure (Px) and the loop pressure (P0) of the preposed pressure stabilizing loop (I) are in a pressure balance state, the flow changing during the variable working condition is absorbed, and the inlet pressure stability of each test branch is ensured.
Compared with the prior art, the application has the beneficial effects that: and the total path pressure is controlled through the bypass pressure stabilizing branch, and the flow control of each branch is performed through the regulation of the branch regulating valve of each test branch and the feedback of the branch flowmeter. On the one hand, the influence of each test loop on the system in the adjusting process is reduced through the stability of the main pipeline pressure, the coupling on the flow control is avoided, on the other hand, the inlet pressure of the branch regulating valve of the test branch is stabilized through the stability of the total pipeline pressure, and the flow regulating precision of the test branch is improved. Each test branch is provided with an independent branch regulating valve and a flowmeter for PID closed-loop control, so that single-channel flow accurate control can be realized.
Drawings
FIG. 1 is a schematic diagram of a multi-circuit flow control system according to an embodiment of the present application.
FIG. 2 is a schematic diagram of a pressure control valve according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a controller according to an embodiment of the application.
Detailed Description
In order to facilitate the understanding of the technical scheme of the present application by those skilled in the art, the technical scheme of the present application will be further described with reference to the accompanying drawings.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, the present application provides a multi-circuit flow control system, which includes a main pipeline 100, a bypass pressure stabilizing branch 200 and a plurality of test branches 300. The bypass voltage stabilizing branch 200 and the plurality of test branches 300 are connected in parallel with the main pipeline 100, and the bypass voltage stabilizing branch 200 is positioned between the main pipeline 100 and the plurality of test branches 300. The bypass pressure stabilizing branch 200 and the main pipeline 100 form a front pressure stabilizing loop I, a pressure control valve 210 is arranged on the bypass pressure stabilizing branch 200, and the pressure of the front pressure stabilizing loop I is stabilized through the pressure control valve 210.
Referring to fig. 1, in an embodiment of the present application, a main pipeline 100 includes a circulation tank 110, and a circulation water pump 120 and a main pipeline flow meter 130 sequentially connected to an outlet of the circulation tank 110. The outlet pipe section of the main pipeline flowmeter 130 is branched, one pipe is connected with the bypass pressure stabilizing branch 200, and the other pipe is connected with the plurality of test branches 300. The main conduit 100 also includes a pressure testing device 140, the pressure testing device 140 being located on the conduit segment before the outlet conduit segment of the main conduit flow meter 130 diverges. The circulating water pump 120 adopts a variable-frequency water pump, and the pressure testing device 140 is used for detecting inlet pressures of each bypass pressure stabilizing branch 200 and the plurality of testing branches 300. The pressure test device 140 may be further provided with a plurality of branch regulating valves 310 respectively disposed on the pressure control valve 210 and the test branches. Specifically, the pressure control valve 210 is a pressure sensor.
Referring to fig. 1 and 2, in one embodiment of the present application, a pressure control valve 210 is disposed at the outlet section of the main line flow meter 130 for controlling the inlet pressure of each test branch. The pressure control valve 210 includes a housing 211, a first cavity 212 and a second cavity 213 are disposed in the housing 211, and a connecting wall 214 is shared between the first cavity 212 and the second cavity 213. A partition wall 215 is provided in the second cavity 213 to divide the second cavity 213 into a first sub-cavity 216 and a second sub-cavity 217. An air inlet 2121 is provided on the first chamber 212, a plurality of first communication ports 2161 are provided on the connecting wall 214 of the first chamber 212 section, and an air inlet 2162 is also provided on the first chamber 212. A plurality of second communication ports 2171 are provided on the connecting wall 214 of the second chamber 213 section, and a outflow port 2172 is also provided on the second chamber 213. The inlet 2162 is connected to an outlet pipe section of the main pipe flowmeter 130, and the outlet 2172 is connected to an inlet of the circulation tank 110. The pressure control valve 210 also includes a diaphragm 218, the diaphragm 218 being located within the first chamber 212. The air inlet 2121 of the pressure control valve 210 is connected to the air source pipe, the air source pressure Px of the air source and the loop pressure P0 of the pre-pressure stabilizing loop I respectively act on two sides of the diaphragm 218 of the pressure control valve 210, and the air source pressure Px and the loop pressure P0 are in a pressure balance state. Wherein the inlet 2162, the diaphragm 218, the plurality of first communication ports 2161, the plurality of second communication ports 2171, and the outlet 2172 form a flow channel. The pressure control valve 210 is, for example, a diaphragm back pressure valve or a differential back pressure valve.
Referring to fig. 1, in an embodiment of the present application, each test branch 300 is independent from each other, and is connected in parallel to the main pipeline 100, and is configured according to the number of system requirements. Each test branch 300 includes a branch regulating valve 310 coupled to an outlet of the main pipe flow meter 130, and a branch flow meter 320 coupled to an outlet of the branch regulating valve 310, an outlet of the branch flow meter 320 being coupled to an inlet of the circulation tank 110. Wherein the test piece 500 is located between the outlet section of the bypass flow meter 320 and the inlet of the circulation tank 110.
Referring to fig. 1 and 3, in an embodiment of the present application, the multi-circuit flow control system further includes a controller 400, wherein the controller 400 includes a plurality of bypass PID control modules (410), a bypass control module 420, and a main line control module 430. The plurality of branch PID control modules (410) are respectively in communication with the branch regulating valves 310 and the branch flowmeters 320 on the plurality of test branches 300, and adjust the valve opening of the branch regulating valves 310 on each branch. The bypass control module 420 is communicatively coupled to the pressure control valve 210 to adjust the turndown ratio of the pressure control valve 210. The main pipeline control module 430 is in communication connection with the circulating water pump 120 and the main pipeline flowmeter 130, and adjusts the rotation speed of the circulating water pump 120. The bypass PID control module (410), the bypass control module 420, and the main line control module 430 can control the pressure control valve 210, the bypass regulator valve 310, and the circulating water pump 120 through flow feedback measured by the main line flow meter 130 and each bypass flow meter 320 to perform flow regulation.
Referring to fig. 1 to 3, in an embodiment of the application, when the system flow is coarsely regulated, the valve flow through the pressure control valve 210 and the bypass regulating valve 310 is:
wherein q is expressed as the valve flow through the valve body, A 0 Expressed as valve port flow area, C q Expressed as a flow coefficient, Δp is expressed as a pressure difference between the front and rear of the valve port, and ρ is expressed as a liquid density.
The bypass branch control module 420 and the plurality of branch PID control modules (410) adjust the turndown ratio width of the pressure control valve 210 and the valve opening of the branch regulator valve 310 according to the valve flow.
When the branch PID control module (410) precisely controls the flow on each test branch, the flow on each test branch is obtained by the following formula:
where u (n) is expressed as the flow value on the current branch, K p Expressed as a proportionality coefficient, K i Expressed as integral coefficient, K d Expressed as differential coefficient, err (n) expressed as deviation of a preset value from a control amount, n expressed as current data, n-1 expressed as last data, err (k) expressed as k=0.
And adjusting the valve opening of the branch regulating valve 310 on each test branch according to the flow rate on each test branch. When the flow measured by the branch flow meter 320 deviates from the set flow or when the flow is adjusted, the valve opening of the branch regulating valve is controlled and adjusted through PID proportion, integral and differential operation, so as to adjust the flow of the test branch.
Referring to fig. 1 to 3, the present application further provides a method for adjusting a multi-loop flow control system, including: when the system is operating in a steady state condition, the pre-valve and post-valve pressures of the pressure control valve 210 and the branch regulating valves 310 on each test branch are stabilized, maintaining the turndown ratio width of the pressure control valve 210 and the valve opening of the branch regulating valves 310 on each test branch.
When part of the test branches are subjected to working condition switching, the test branches are subjected to flow regulation by regulating the branch regulating valve 310 according to the requirement, at this time, the total flow capacity of each test branch is changed, and the air source pressure Px of the pressure control valve 210 is regulated, so that the air source pressure Px and the loop pressure P0 of the front pressure stabilizing loop I are in a pressure balance state, the flow changing during the variable working condition is absorbed, and the inlet pressure stability of each test branch is ensured.
If the inlet pressure control of each test branch is not performed, when some test branches perform working condition switching, the test branch adjusts the branch adjusting valve 310 according to the requirement to perform flow adjustment, at this time, the total flow capacity of each test branch changes, under the condition that the pressure control valve 210 is not provided, the inlet pressure of each test branch changes, so that the flow of each test branch changes, the branch PID control module 410 of each test branch controls and adjusts the flow of the test branch, and the branch adjusting valve 310 performs opening adjustment to maintain the target flow. Because the number of the test branches is large, the test branches can mutually influence the coupling relation in the flow adjustment, so that the system flow and the pressure adjustment are oscillated, and the stable control of the flow is difficult to realize.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The above-described embodiments merely represent embodiments of the application, the scope of the application is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.
Claims (10)
1. A multi-circuit flow control system, comprising a main pipeline (100), a bypass pressure stabilizing branch (200) and a plurality of test branches (300); the bypass voltage stabilizing branch circuit (200) and the plurality of test branch circuits (300) are connected with the main pipeline (100) in parallel, and the bypass voltage stabilizing branch circuit (200) is positioned between the main pipeline (100) and the plurality of test branch circuits (300);
the bypass pressure stabilizing branch circuit (200) and the main pipeline (100) form a preposed pressure stabilizing loop (I), a pressure control valve (210) is arranged on the bypass pressure stabilizing branch circuit (200), and the pressure of the preposed pressure stabilizing loop (I) is stabilized through the pressure control valve (210).
2. The multi-circuit flow control system according to claim 1, wherein the main pipe (100) comprises a circulation tank (110), and a circulation water pump (120) and a main pipe flow meter (130) sequentially connected to an outlet of the circulation tank (110).
3. The multi-circuit flow control system of claim 2, wherein the outlet pipe section of the main pipe flow meter (130) diverges, one pipe being connected to a bypass pressure stabilizing branch (200), the other pipe being connected to a plurality of the test branches (300); the main conduit (100) further comprises a pressure testing device (140), the pressure testing device (140) being located on a section of the main conduit flow meter (130) before the outlet section diverges.
4. A multi-circuit flow control system according to claim 3, characterized in that the inlet (2162) of the pressure control valve (210) is connected to the outlet pipe section of the main pipe flowmeter (130), and the outlet (2172) of the pressure control valve (210) is connected to the inlet of the circulation tank (110); an air inlet (2121) of the pressure control valve (210) is connected to an air source.
5. The multi-circuit flow control system according to claim 4, wherein a gas source pressure (Px) of the gas source and a circuit pressure (P0) of the pre-pressure stabilizing circuit (I) respectively act on both sides of a diaphragm (218) of the pressure control valve (210), and the gas source pressure (Px) and the circuit pressure (P0) are in a pressure balance state.
6. The multi-circuit flow control system of claim 5, wherein each of the test branches (300) includes a branch regulator valve (310) that is plumbed to an outlet of the main line flow meter (130), and a branch flow meter (320) that is plumbed to an outlet of the branch regulator valve (310); an outlet of the bypass flow meter (320) is connected with an inlet of the circulating water tank (110).
7. The multi-circuit flow control system of claim 6, further comprising a controller (400), the controller (400) including a plurality of bypass PID control modules (410), a bypass control module (420), and a main line control module (430) therein;
the branch PID control modules (410) are respectively connected with the branch regulating valves (310) and the branch flowmeters (320) on the test branches (300) in a communication way, and the valve opening of the branch regulating valves (310) on each branch is regulated;
the bypass branch control module (420) is in communication connection with the pressure control valve (210) and adjusts the regulating ratio width of the pressure control valve (210);
the main pipeline control module (430) is in communication connection with the circulating water pump (120) and the main pipeline flowmeter (130) and adjusts the rotating speed of the circulating water pump (120).
8. The multi-circuit flow control system of claim 7, wherein when the system flow is coarsely regulated, then the valve flow through the pressure control valve (210) and bypass regulator valve (310) is:
wherein q is expressed as the valve flow through the valve body, A 0 Expressed as valve port flow area, C q Expressed as a flow coefficient, Δp expressed as a pressure difference between the front and rear of the valve port, ρ expressed as a liquid density;
the bypass branch control module (420) and the plurality of branch PID control modules (410) adjust the regulating ratio width of the pressure control valve (210) and the valve opening of the branch regulating valve (310) according to the valve flow.
9. The multi-circuit flow control system of claim 8, wherein when the bypass PID control module (410) is configured to accurately control the flow on each test bypass, the flow on each test bypass is obtained by the following equation:
where u (n) is expressed as the flow value on the current branch, K p Expressed as a proportionality coefficient, K i Expressed as integral coefficient, K d Expressed as differential coefficient, err (n) expressed as deviation of preset value from control amount, n expressed as current data, n-1 expressed as last data, err (k) expressed as k=0, and a summation error of n;
and adjusting the valve opening of the branch regulating valve (310) on each test branch according to the flow on each test branch.
10. A method of regulating a multi-circuit flow control system according to any one of claims 1-9, comprising:
when the system operates under a stable working condition, the pressure control valve (210) and the front and back valve pressures of the branch regulating valves (310) on each test branch are stable, and the regulating ratio width of the pressure control valve (210) and the valve opening of the branch regulating valves (310) on each test branch are kept;
when part of the test branches are subjected to working condition switching, the test branches are subjected to flow regulation by regulating branch regulating valves (310) according to requirements, the total flow capacity of each test branch is changed at the moment, and the air source pressure (Px) of the pressure control valve (210) is regulated, so that the air source pressure (Px) and the loop pressure (P0) of the preposed pressure stabilizing loop (I) are in a pressure balance state, the flow changing during the variable working condition is absorbed, and the inlet pressure stability of each test branch is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311097773.1A CN117167661A (en) | 2023-08-28 | 2023-08-28 | Multi-loop flow control system and adjusting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311097773.1A CN117167661A (en) | 2023-08-28 | 2023-08-28 | Multi-loop flow control system and adjusting method |
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| CN117167661A true CN117167661A (en) | 2023-12-05 |
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| CN202311097773.1A Pending CN117167661A (en) | 2023-08-28 | 2023-08-28 | Multi-loop flow control system and adjusting method |
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