CN110908409A - Method for quickly keeping constant flow of new energy tester - Google Patents
Method for quickly keeping constant flow of new energy tester Download PDFInfo
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- CN110908409A CN110908409A CN201911251779.3A CN201911251779A CN110908409A CN 110908409 A CN110908409 A CN 110908409A CN 201911251779 A CN201911251779 A CN 201911251779A CN 110908409 A CN110908409 A CN 110908409A
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
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Abstract
The invention relates to the field of flow control, in particular to a method for quickly keeping constant flow of a new energy tester. New forms of energy test machine includes: the system comprises a circulating pipeline, a variable frequency motor, a three-way proportional valve, a flowmeter and a controller; method for fast constant flow: inputting an outlet flow set value to obtain the frequency of the variable frequency motor and the output sectional area of the three-way proportional valve, and adjusting the flow; detecting the actual flow value and comparing the actual flow value with the set outlet flow value; adjusting the output cross section area of the proportional valve and the frequency of the variable frequency motor; the actual flow value is detected and compared with the set outlet flow value. Based on the structure, the flow of the circulating pipeline can be quickly adjusted by adjusting the output cross section area of the three-way proportional valve and the frequency of the variable frequency motor. Meanwhile, the actual flow value is compared with the set outlet flow value, whether the flow in the circulating pipeline is balanced or not can be judged quickly, and therefore the flow of the stable circulating pipeline can be accelerated further.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a method for quickly keeping constant flow of a new energy tester.
Background
The traditional flow stabilizing method of the testing machine (simulator for testing performances of battery packs and the like) is slow in flow stabilizing, dead zones (flow in a certain interval cannot be adjusted) are prone to occurring, testing efficiency is greatly influenced, and the rapid and stable effect cannot be achieved along with the change of temperature and pressure.
Therefore, a fast constant flow method for new energy testers is needed.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for quickly keeping constant flow of a new energy tester, which has the function of quickly stabilizing the flow.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for quickly keeping constant flow of a new energy tester comprises the following steps: a mechanical part and an electrical part controlling the mechanical part, the mechanical part comprising: the system comprises a circulating pipeline, a variable frequency motor, a three-way proportional valve and a flowmeter;
the circulating pipeline comprises an external circulation and an internal circulation communicated with the external circulation, the variable frequency motor and the flowmeter are connected in series on the external circulation, two valves of the three-way proportional valve are communicated with the external circulation, and the other valve is communicated with the internal circulation;
the electrical part includes: the controller is used for regulating and controlling the output cross section area of the three-way proportional valve and the frequency of the variable frequency motor;
method for fast constant flow:
the first step comprises the following steps: inputting an outlet flow set value through the variable frequency motor 20; when Q > 40% Qmax, S1 ═ Smax, f ═ Qmax/k; when Q < 40% Qmax, f is 40% Qmax, S1 is Q Smax/40% Qmax; wherein Q is an outlet flow set value, S1 is an output sectional area of the three-way proportional valve 30, Smax is a total sectional area of the new energy tester, f is the frequency of the variable frequency motor 20, Qmax is a maximum flow value of the new energy tester, and k is a proportionality coefficient; and f and S1 are sent as initial values to the controller to adjust the frequency of the inverter motor 20 and the cross-sectional area of the output of the three-way proportional valve 30.
The second step comprises the following steps: detecting the actual flow value of the external circulation again by using the flowmeter, and then comparing the actual flow value with the set flow value of the outlet;
the third step comprises: when the actual flow value is equal to the set outlet flow value, stopping adjusting the flow;
the fourth step comprises the following steps: when the actual flow value is not equal to the set outlet flow value, calculating the actual frequency of the variable frequency motor corresponding to the actual flow value through a formula f 1-Q1/k, wherein f1 is the actual frequency of the variable frequency motor, and Q1 is the actual flow value;
when the actual flow value is greater than the set outlet flow value,
(1) when the actual frequency of the variable frequency motor is less than or equal to 40% Fmax, reducing the output sectional area of the proportional valve;
(2) when the actual frequency of the variable frequency motor is greater than 40% Fmax, reducing the frequency of the variable frequency motor;
when the actual flow value is less than the set outlet flow value,
(1) when the actual frequency of the variable frequency motor is greater than or equal to Fmax, increasing the output sectional area of the proportional valve;
when the actual frequency of the variable frequency motor is smaller than Fmax, increasing the frequency of the variable frequency motor;
and the Fmax is the maximum frequency of the variable frequency motor.
The fifth step comprises the following steps: detecting the actual flow value of the external circulation again by using the flowmeter, and then comparing the actual flow value with the set flow value of the outlet;
the sixth step comprises: when the actual flow value is equal to the set outlet flow value, storing the frequency of the variable frequency motor corresponding to the actual flow value and the output sectional area value of the three-way proportional valve into a database;
and when the actual flow value is not equal to the set outlet flow value, returning to the step four.
Preferably, the electrical part further comprises: the database is used for receiving the actual flow value sent by the flowmeter and comparing the actual flow value with the constant flow value;
the first step comprises the following steps: inputting an outlet flow set value through a variable frequency motor, detecting an externally circulating actual flow value by using a flowmeter, then sending the actual flow value to a database, and finally comparing the actual flow value with a constant flow value;
when the actual flow value is equal to the constant flow value, the database transmits the output cross section area of the three-way proportional valve and the frequency of the variable frequency motor corresponding to the constant flow value to the controller so as to respectively control the three-way proportional valve and the variable frequency motor;
when the outlet flow set value is not equal to any of the constant flow values, inputting the outlet flow set value through the variable frequency motor 20; when Q > 40% Qmax, S1 ═ Smax, f ═ Qmax/k; when Q < 40% Qmax, f is 40% Qmax, S1 is Q Smax/40% Qmax; wherein Q is an outlet flow set value, S1 is an output sectional area of the three-way proportional valve 30, Smax is a total sectional area of the new energy tester, f is the frequency of the variable frequency motor 20, Qmax is a maximum flow value of the new energy tester, and k is a proportionality coefficient; and f and S1 are sent as initial values to the controller to adjust the frequency of the inverter motor 20 and the cross-sectional area of the output of the three-way proportional valve 30.
Preferably, the constant flow value and the three-way proportional valve output cross-sectional area and the frequency of the variable frequency motor corresponding to the constant flow value are provided with a plurality of values, and the first step includes: inputting an outlet flow set value through a variable frequency motor, detecting an internal circulation actual flow value by using a flow meter, then sending the actual flow value to a database, and finally comparing the actual flow value with a plurality of constant flow values;
when the actual flow value is equal to one of the constant flow values, the database transmits the output cross section area of the three-way proportional valve and the frequency of the variable frequency motor corresponding to the constant flow value to the controller so as to respectively control the three-way proportional valve and the variable frequency motor;
when the outlet flow set value is not equal to any one of the constant flow values, the outlet flow set value is input through the variable frequency motor 20; when Q > 40% Qmax, S1 ═ Smax, f ═ Qmax/k; when Q < 40% Qmax, f is 40% Qmax, S1 is Q Smax/40% Qmax; wherein Q is an outlet flow set value, S1 is an output sectional area of the three-way proportional valve 30, Smax is a total sectional area of the new energy tester, f is the frequency of the variable frequency motor 20, Qmax is a maximum flow value of the new energy tester, and k is a proportionality coefficient; and f and S1 are sent as initial values to the controller to adjust the frequency of the inverter motor 20 and the cross-sectional area of the output of the three-way proportional valve 30.
Preferably, the third step includes: and when the actual flow value is equal to the set outlet flow value, stopping adjusting the flow, and storing the frequency of the variable frequency motor corresponding to the actual flow value and the output sectional area of the proportional valve into a database.
Preferably, the flow meter is provided as a flow sensor.
By adopting the technology, the invention has the beneficial effects that:
the flow of the circulating pipeline can be quickly adjusted by adjusting the output cross section area of the three-way proportional valve and the frequency of the variable frequency motor. Meanwhile, the actual flow value is compared with the set outlet flow value, whether the flow in the circulating pipeline is balanced or not can be judged quickly, and therefore the flow of the stable circulating pipeline can be accelerated further.
Drawings
FIG. 1 is a schematic structural diagram of a new energy tester according to the present invention;
FIG. 2 is a diagram of the method steps of the present invention;
reference numerals:
11. a first pipeline; 12. a second pipeline; 13. a third pipeline; 14. a fourth pipeline; 15. a fifth pipeline; 16. a sixth pipeline; 17. a seventh pipeline; 20. a variable frequency motor, 30 and a three-way proportional valve; 40. a flow meter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, the present invention relates to a method for fast keeping constant flow rate of a new energy tester, wherein the first embodiment is as follows:
new forms of energy test machine includes: a mechanical part and an electrical part for controlling the mechanical part, the mechanical part comprising: a circulating pipeline, a variable frequency motor 20, a three-way proportional valve 30 and a flowmeter 40;
the circulating pipeline comprises an external circulation and an internal circulation communicated with the external circulation (the circulating pipeline comprises a first pipeline 11, a second pipeline 12, a third pipeline 13, a fourth pipeline 14, a fifth pipeline 15, a sixth pipeline 16 and a seventh pipeline 17, wherein the first pipeline 11, the second pipeline 12, the third pipeline 13, the fourth pipeline 14, the sixth pipeline 16 and the seventh pipeline 17 form the external circulation, the first pipeline 11, the second pipeline 12, the fifth pipeline 15, the sixth pipeline 16 and the seventh pipeline 17 form the internal circulation), the variable frequency motor 20 and the flow meter 40 are connected in series on the external circulation, two valves of the three-way proportional valve 30 are communicated with the external circulation, and the other valve is communicated with the internal circulation;
the electrical part includes: a controller for regulating and controlling the output cross section area of the three-way proportional valve 30 and the frequency of the variable frequency motor 20;
method for fast constant flow:
the first step comprises the following steps: inputting an outlet flow set value through the variable frequency motor 20, and inputting an outlet flow set value through the variable frequency motor 20; when Q > 40% Qmax, S1 ═ Smax, f ═ Qmax/k; when Q < 40% Qmax, f is 40% Qmax, S1 is Q Smax/40% Qmax; wherein Q is an outlet flow set value, S1 is an output sectional area of the three-way proportional valve 30, Smax is a total sectional area of the new energy tester, f is the frequency of the variable frequency motor 20, Qmax is a maximum flow value of the new energy tester, and k is a proportionality coefficient; and f and S1 are used as initial values to be sent to the controller to adjust the frequency of the variable frequency motor 20 and the output sectional area of the three-way proportional valve 30;
the second step comprises the following steps: detecting the actual flow value of the external circulation by using the flowmeter 40, and then comparing the actual flow value with the set outlet flow value;
the third step comprises: when the actual flow value is equal to the set outlet flow value, stopping adjusting the flow of the circulating pipeline;
the fourth step comprises the following steps: when the actual flow value is not equal to the set outlet flow value, calculating the actual frequency of the variable frequency motor 20 corresponding to the actual flow value through a formula f 1-Q1/k, wherein f1 is the actual frequency of the variable frequency motor 20, and Q1 is the actual flow value;
when the actual flow value is greater than the set outlet flow value,
(1) when the actual frequency of the variable frequency motor 20 is less than or equal to 40% Fmax, reducing the output sectional area of the proportional valve;
(2) when the actual frequency of the variable frequency motor 20 is greater than 40% Fmax, reducing the frequency of the variable frequency motor 20;
when the actual flow value is less than the set outlet flow value,
(1) when the actual frequency of the variable frequency motor 20 is greater than or equal to Fmax, increasing the output sectional area of the proportional valve;
when the actual frequency of the variable frequency motor 20 is less than Fmax, increasing the frequency of the variable frequency motor 20;
the Fmax is the maximum frequency of the variable frequency motor;
the fifth step comprises the following steps: detecting the actual flow value of the external circulation by using the flowmeter 40, and then comparing the actual flow value with the set outlet flow value;
the sixth step comprises: when the actual flow value is equal to the set outlet flow value, stopping adjusting the flow of the circulating pipeline;
and when the actual flow value is not equal to the set outlet flow value, returning to the step four.
Based on the structure, the flow of the circulating pipeline can be quickly adjusted by adjusting the output cross section area of the three-way proportional valve 30 and the frequency of the variable frequency motor 20. Meanwhile, the actual flow value is compared with the set outlet flow value, whether the flow in the circulating pipeline is balanced or not can be judged quickly, and therefore the flow of the stable circulating pipeline can be accelerated further.
In order to quickly adjust and stabilize the flow, a second embodiment is provided, wherein the difference between the second embodiment and the first embodiment is as follows: the electrical part of the present embodiment further comprises: a database (not shown in the figure) storing the constant flow value and the output sectional area of the three-way proportional valve 30 corresponding to the constant flow value and the frequency of the variable frequency motor 20, wherein the database is used for receiving the actual flow value sent by the flowmeter 40 and comparing the actual flow value with the constant flow value;
the first step comprises the following steps: inputting an outlet flow set value through the variable frequency motor 20, detecting an external circulation flow actual value by using the flowmeter 40, then sending the flow actual value to a database, and finally comparing the flow actual value with a constant flow value;
when the actual flow value is equal to the constant flow value, the database transmits the output cross section area of the three-way proportional valve 30 and the frequency of the variable frequency motor 20 corresponding to the constant flow value to the controller so as to control the three-way proportional valve 30 and the variable frequency motor 20 respectively;
when the outlet flow set value is not equal to the constant flow value, the outlet flow set value is input through the variable frequency motor 20; when Q > 40% Qmax, S1 ═ Smax, f ═ Qmax/k; when Q < 40% Qmax, f is 40% Qmax, S1 is Q Smax/40% Qmax; wherein Q is an outlet flow set value, S1 is an output sectional area of the three-way proportional valve 30, Smax is a total sectional area of the new energy tester, f is the frequency of the variable frequency motor 20, Qmax is a maximum flow value of the new energy tester, and k is a proportionality coefficient; and f and S1 are sent as initial values to the controller to adjust the frequency of the inverter motor 20 and the cross-sectional area of the output of the three-way proportional valve 30.
Based on the structure, a database is arranged, and a constant flow value, the output sectional area of the three-way proportional valve 30 corresponding to the constant flow value and the frequency of the variable frequency motor 20 are stored in the database, so that when an outlet flow set value is input, the constant flow value can be quickly matched, the output sectional area of the three-way proportional valve 30 corresponding to the constant flow value and the frequency of the variable frequency motor 20 can be used for quickly adjusting the three-way proportional valve 30 and the variable frequency motor 20, and the current can be quickly kept constant.
In order to further improve the second embodiment, a third embodiment is provided, and the difference between the third embodiment and the second embodiment is as follows: the constant flow value and the output cross section area of the three-way proportional valve 30 and the frequency of the variable frequency motor 20 corresponding to the constant flow value are provided in a plurality of numbers. Based on the structure, the probability that the outlet flow set value can be matched with the constant flow value can be improved by setting the plurality of constant flow values, and the flow stabilizing speed is accelerated.
In order to adjust and stabilize the flow more quickly, a fourth embodiment is provided, and the fourth embodiment is different from the first embodiment in that: the third step of this embodiment includes: and when the actual flow value is equal to the set outlet flow value, stopping adjusting the flow, and storing the frequency of the variable frequency motor 20 corresponding to the actual flow value and the output sectional area of the three-way proportional valve 30 into the database. Based on the structure, when the actual flow value is equal to the set outlet flow value, the numerical control library stores and records the actual flow value, the frequency of the variable frequency motor 20 corresponding to the actual flow value and the output sectional area of the three-way proportional valve 30, so that the number of constant flow values in the database can be increased, the matching probability of the set outlet flow value is improved, and the flow stabilizing rate is accelerated.
In order to detect the actual flow value in real time, a fifth embodiment is provided, and the difference between the fifth embodiment and the first embodiment is as follows: the flow meter 40 of the present embodiment is provided as a flow sensor.
In order to ensure the adjustment precision and further accelerate the speed of stabilizing the flow, in this embodiment, when the system flow is adjusted, the frequency of the variable frequency motor 20 is mainly adjusted, and the output sectional area of the three-way proportional valve 30 is adjusted as an auxiliary. Based on the structure, in the process from the fourth step to the sixth step of the circulation, when the difference between the actual flow value and the set outlet flow value is small, because the precision value of the output sectional area of the three-way proportional valve 30 is lower than the precision value of the frequency of the variable frequency motor 20, the error in directly adjusting the output sectional area of the three-way proportional valve 30 is large, the adjusting time can be prolonged, and the quick and stable flow is not facilitated. By adjusting the frequency of the inverter motor 20, the frequency accuracy of the inverter motor 20 is high, so that the adjustment range is easily narrowed, and the flow stabilizing rate can be increased.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (6)
1. A method for quickly keeping constant flow of a new energy tester is characterized in that the new energy tester comprises the following steps: a mechanical part and an electrical part controlling the mechanical part, the mechanical part comprising: the system comprises a circulating pipeline, a variable frequency motor (20), a three-way proportional valve (30) and a flowmeter (40);
the circulating pipeline comprises an external circulation and an internal circulation communicated with the external circulation, the variable frequency motor (20) and the flowmeter (40) are connected in series on the external circulation, two valves of the three-way proportional valve (30) are communicated with the external circulation, and the other valve is communicated with the internal circulation;
the electrical part includes: a controller for regulating and controlling the output cross section area of the three-way proportional valve (30) and the frequency of the variable frequency motor (20);
method for fast constant flow:
the first step comprises the following steps: inputting an outlet flow set value through a variable frequency motor (20); when Q > 40% Qmax, S1 ═ Smax, f ═ Qmax/k; when Q < 40% Qmax, f is 40% Qmax, S1 is Q Smax/40% Qmax; q is an outlet flow set value, S1 is an output sectional area of the three-way proportional valve (30), Smax is a total sectional area of the new energy tester, f is the frequency of the variable frequency motor (20), Qmax is a maximum flow value of the new energy tester, and k is a proportional coefficient; and f and S1 are used as initial values to be sent to a controller to adjust the frequency of the variable frequency motor (20) and the output sectional area of the three-way proportional valve (30);
the second step comprises the following steps: detecting an actual flow value of the external circulation by using a flow meter (40), and then comparing the actual flow value with a set outlet flow value;
the third step comprises: when the actual flow value is equal to the set outlet flow value, stopping adjusting the flow;
the fourth step comprises the following steps: when the actual flow value is not equal to the set outlet flow value, calculating the actual frequency of the variable frequency motor (20) corresponding to the actual flow value through a formula f 1-Q1/k, wherein f1 is the actual frequency of the variable frequency motor (20), and Q1 is the actual flow value;
when the actual flow value is greater than the set outlet flow value,
(1) when the actual frequency of the variable frequency motor (20) is less than or equal to 40% Fmax, reducing the output sectional area of the proportional valve;
(2) when the actual frequency of the variable frequency motor (20) is greater than 40% Fmax, reducing the frequency of the variable frequency motor (20);
when the actual flow value is less than the set outlet flow value,
(1) when the actual frequency of the variable frequency motor (20) is greater than or equal to Fmax, increasing the output sectional area of the proportional valve;
when the actual frequency of the variable frequency motor (20) is less than Fmax, increasing the frequency of the variable frequency motor (20);
the Fmax is the maximum frequency of the variable frequency motor;
the fifth step comprises the following steps: detecting an actual flow value of the external circulation by using a flow meter (40), and then comparing the actual flow value with a set outlet flow value;
the sixth step comprises: when the actual flow value is equal to the set outlet flow value, stopping adjusting the flow;
and when the actual flow value is not equal to the set outlet flow value, returning to the step four.
2. The method for fast constancy of flow in new energy testing machines according to claim 1, characterized in that said electrical section further comprises: the database is stored with a constant flow value, the output sectional area of the three-way proportional valve (30) corresponding to the constant flow value and the frequency of the variable frequency motor (20), and is used for receiving the actual flow value sent by the flowmeter (40) and comparing the actual flow value with the constant flow value;
the first step comprises the following steps: inputting an outlet flow set value through a variable frequency motor (20), detecting an externally circulating flow actual value by using a flowmeter (40), then sending the flow actual value to a database, and finally comparing the flow actual value with a constant flow value;
when the actual flow value is equal to the constant flow value, the database transmits the output cross section area of the three-way proportional valve (30) and the frequency of the variable frequency motor (20) corresponding to the constant flow value to the controller so as to respectively control the three-way proportional valve (30) and the variable frequency motor (20);
when the outlet flow set value is not equal to the constant flow value, the outlet flow set value is input through a variable frequency motor (20); when Q > 40% Qmax, S1 ═ Smax, f ═ Qmax/k; when Q < 40% Qmax, f is 40% Qmax, S1 is Q Smax/40% Qmax; q is an outlet flow set value, S1 is an output sectional area of the three-way proportional valve (30), Smax is a total sectional area of the new energy tester, f is the frequency of the variable frequency motor (20), Qmax is a maximum flow value of the new energy tester, and k is a proportional coefficient; and sending f and S1 as initial values to a controller to adjust the frequency of the variable frequency motor (20) and the output cross-sectional area of the three-way proportional valve (30).
3. The method for fast keeping constant flow of the new energy tester as claimed in claim 2, wherein the constant flow value and the output cross section area of the three-way proportional valve (30) and the frequency of the variable frequency motor (20) corresponding to the constant flow value are provided in a plurality of numbers, and the step one comprises: inputting an outlet flow set value through a variable frequency motor (20), detecting an internal circulation flow actual value by using a flow meter (40), then sending the flow actual value to a database, and finally comparing the flow actual value with a plurality of constant flow values;
when the actual flow value is equal to one of the constant flow values, the database transmits the output cross section area of the three-way proportional valve (30) and the frequency of the variable frequency motor (20) corresponding to the constant flow value to the controller so as to respectively control the three-way proportional valve (30) and the variable frequency motor (20);
when the outlet flow set value is not equal to any one of the constant flow values, the outlet flow set value is input through a variable frequency motor (20); when Q > 40% Qmax, S1 ═ Smax, f ═ Qmax/k; when Q < 40% Qmax, f is 40% Qmax, S1 is Q Smax/40% Qmax; q is an outlet flow set value, S1 is an output sectional area of the three-way proportional valve (30), Smax is a total sectional area of the new energy tester, f is the frequency of the variable frequency motor (20), Qmax is a maximum flow value of the new energy tester, and k is a proportional coefficient; and sending f and S1 as initial values to a controller to adjust the frequency of the variable frequency motor (20) and the output cross-sectional area of the three-way proportional valve (30).
4. The method for fast constancy of flow in new energy testing machines according to claim 1, characterized in that said third step comprises: and when the actual flow value is equal to the set outlet flow value, stopping adjusting the flow, and storing the frequency of the variable frequency motor (20) corresponding to the actual flow value and the output sectional area of the proportional valve into a database.
5. The method for fast constancy of flow in new energy testing machines according to claim 1, characterized in that said sixth step comprises: when the actual flow value is equal to the set outlet flow value, stopping adjusting the flow, and storing the frequency of the variable frequency motor (20) corresponding to the actual flow value and the output sectional area value of the three-way proportional valve (30) into a database;
and when the actual flow value is not equal to the set outlet flow value, returning to the step four.
6. The method for fast constancy of flow in new energy testing machines according to claim 1, characterized in that said flow meter (40) is provided as a flow sensor.
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| CN110007642A (en) * | 2019-04-29 | 2019-07-12 | 南通航海机械集团有限公司 | Marine exhaust cleans big flow seawater pump group automation control method |
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| CN111473842B (en) * | 2020-04-26 | 2021-08-03 | 中国计量大学 | Flow regulating method for water flow standard device |
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