CN118051071A - Adjustable gas flow measurement and control device and method - Google Patents
Adjustable gas flow measurement and control device and method Download PDFInfo
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- CN118051071A CN118051071A CN202410444872.0A CN202410444872A CN118051071A CN 118051071 A CN118051071 A CN 118051071A CN 202410444872 A CN202410444872 A CN 202410444872A CN 118051071 A CN118051071 A CN 118051071A
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- 230000006698 induction Effects 0.000 claims description 3
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- 238000009530 blood pressure measurement Methods 0.000 description 3
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Abstract
The invention discloses an adjustable gas flow measurement and control device, which comprises a front end gas circuit module, a proportional valve measurement and control module and a rear end gas circuit module which are connected in sequence; the proportional valve measurement and control module comprises a valve body part and a base part which are integrally formed; the valve body part comprises a valve body shell and an inner movable valve core; the base part is connected with the front end air channel module and the rear end air channel module, and the air channels at the two ends are communicated with the opening at the upper part of the base along the valve core; the opening height can be changed through the movement of the valve core; the front end gas circuit module and the rear end gas circuit module are respectively provided with a front end pressure measuring hole and a rear end pressure measuring hole for measuring pressure; according to the invention, through changing the valve core opening height, the flow in the pipeline is further changed, and meanwhile, the relationship among the current, the front-rear end pressure difference and the rear-end pipeline flow is controlled through fitting the proportional valve module, so that the effects of real-time accurate measurement and real-time control are realized.
Description
Technical Field
The invention belongs to the technical field of flow measurement and control, and particularly relates to an adjustable gas flow measurement and control device and method.
Background
Differential pressure flow measurement has wide application in industry, particularly in gas flow measurement. However, the conventional differential pressure flow measurement device can only realize flow measurement, and for control, control equipment such as a proportional valve is additionally arranged, which can cause additional pressure loss in a pipeline to a certain extent, so that the flow measurement accuracy is not high.
In addition, in the practical application scene, a measurement and control integrated device capable of measuring flow in real time and controlling flow in real time is needed, and the traditional differential pressure measuring device cannot simultaneously give consideration to accurate measurement and real-time control.
Disclosure of Invention
The invention aims to: compared with the traditional differential pressure type flow measurement device, the adjustable gas flow measurement and control device and method are free from the influence of pipeline pressure loss, simpler in structure and capable of obtaining more accurate measurement effects. In addition, the invention also provides a detailed calculation method, which can realize the real-time measurement and control of the gas flow.
The technical scheme is as follows: an adjustable gas flow measurement and control device comprises a front end gas circuit module, a proportional valve measurement and control module and a rear end gas circuit module which are connected in sequence; the proportional valve measurement and control module comprises a valve body part and a base part which are integrally formed; the valve body part comprises a valve body shell and an inner movable valve core; the base part is connected with the front end air channel module and the rear end air channel module, and the air channels at the two ends are communicated with the opening at the upper part of the base along the valve core; the opening height can be changed through the movement of the valve core; the front end gas circuit module and the rear end gas circuit module are respectively provided with a front end pressure measuring hole and a rear end pressure measuring hole for measuring pressure.
Further, the valve body part comprises an electromagnetic coil, a pre-tightening spring, a valve core and a valve body shell; the pre-tightening spring is respectively connected with the valve core and the valve body shell and provides a pressing force for the valve core; an electromagnetic coil is wound along the outside of the valve core, and a reverse electromagnetic force is provided by an external control current.
Further, the cross section of the base part is in an I shape, and two sides of the base part are respectively connected with a front end self-locking joint and a rear end self-locking joint; the upper end surfaces of two sides of the base are respectively communicated with the valve body part through a front end connector and a rear end connector; the lower part of the valve core is provided with a protruding part which is matched with the front end connecting port.
Further, a groove is formed in the top of the valve core, and a pre-tightening spring is arranged in the groove.
Further, the front-end gas circuit module comprises an airflow input hole, a front-end measuring gas channel and a front-end interface which are sequentially communicated; the side wall of the front end measuring airway is provided with a front end pressure measuring hole; the front end interface is connected to the proportional valve measurement and control module through a front end self-locking connector.
Further, the rear end gas circuit module comprises a rear end measuring gas channel and a gas flow output hole which are sequentially communicated; the side wall of the rear end measuring airway is provided with a rear end pressure measuring hole; the rear end self-locking connector is respectively connected with the proportional valve measurement and control module and the rear end measurement airway.
A measurement and control method adopting the adjustable gas flow measurement and control device comprises the following steps:
Step S1, fitting a relation between the opening height and the control current based on a valve core stress balance relation;
and S2, calculating the gas flow based on a differential pressure type gas flow measurement principle, and finally obtaining the relation between the rear end pipeline flow Q and the control current and between the front end and the rear end pressure difference.
Further, when the opening height is h in the step S1, the valve element force balance formula is as follows:
；
；
；
Wherein the method comprises the steps of Representing the pre-tightening force of a spring, wherein G represents the gravity of a valve core, F I represents the electromagnetic force and Ps represents the hydrostatic pressure; /(I)Representing the initial spring preload,/>Representing the initial position of the spring,/>Representing the spring rate; due to/>，/>Discarding G and Ps, the above formula is simplified as:
；
Wherein the electromagnetic force Wherein B represents magnetic induction intensity, I represents current intensity, and L represents coil length; thus:
。
Further, the conventional differential pressure flow measurement formula in the step S2 is as follows:
；
Wherein K represents the correction coefficient and wherein, Represents the back end air flow density, Q represents the back end flow,/>Representing the pressure difference of the front-end gas circuit and the rear-end gas circuit;
Obtaining the relation between K and h by adopting a calibration method According to the method obtained in step S1Find/>；
In additionThe relationship with the back-end pressure P2 is as follows:
；
wherein M represents the molar mass of the gas, R is the gas constant, and T represents the temperature;
the method is as follows:
。
Compared with the prior art, the technical scheme adopted by the invention has the following beneficial effects:
Compared with the existing differential pressure type gas flow measuring device, the proportional valve measuring and controlling module is directly used as a front-rear differential pressure generating source, the problem that the pressure loss of a pipeline is overlarge due to the fact that a differential pressure hole is additionally arranged is not needed to be considered, the structure is simpler, meanwhile, the accuracy of a gas flow measuring result is ensured, and the measurement and control integration is realized.
The invention provides a detailed measurement and control method, which combines an electromagnetic proportional valve working principle and a differential pressure type flow measurement principle to provide a measurement method of gas flow under the condition of different control currents, and the relationship between the control current and the correction coefficient is obtained by calibrating the relationship between the correction coefficient of the proportional valve and the height of an opening, so that the quantitative relationship among the external control current, the differential pressure value and the final flow is finally obtained. The method can realize real-time calculation and control of the flow of the rear-end pipeline.
Drawings
FIG. 1 is a schematic diagram of an adjustable gas flow measurement and control device according to the present invention;
fig. 2 is a perspective structure diagram of the adjustable gas flow measurement and control device provided by the invention.
Reference numerals illustrate:
1-an air flow input hole; 2-front end measurement airway; 3-a front end pressure measuring hole; 4-front end interface; 5-an electromagnetic coil; 6-pre-tightening a spring; 7-a valve core; 8-valve body housing; 9-a back end interface; 10-back end measurement airway; 11-a rear end pressure measurement hole; 12-airflow output hole.
Detailed Description
The invention provides an adjustable gas flow measurement and control device, which is characterized in that an electromagnetic proportional valve is arranged on a traditional welding protection gas path and is externally connected with a front end pressure measurement device and a rear end pressure measurement device, and the gas flow in a current pipeline can be measured in real time based on the current magnitude and the front end and rear end gas flow pressure controlled by the proportional valve. The current flow at the rear end of the current pipeline can be calculated in real time by changing the current magnitude of the control current of the proportional valve, so that the flow control is realized. The measuring and controlling device and the method of the invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1-2, the adjustable gas flow measurement and control device provided by the invention comprises a front-end gas circuit module, a proportional valve measurement and control module and a rear-end gas circuit module. The front-end gas circuit module comprises an airflow input hole 1, a front-end measuring air passage 2 and a front-end interface 4 which are communicated in sequence. The external pipeline is connected to the front end gas circuit module through the gas flow input hole 1. The side wall of the front end measuring air flue 2 is provided with a front end pressure measuring hole 3 for measuring the pressure of the front end pipeline. The front end interface 4 is connected to the proportional valve measurement and control module through a front end self-locking joint.
The proportional valve measurement and control module comprises a valve body part and a base part which are integrally formed; the valve body part comprises an electromagnetic coil 5, a pre-tightening spring 6, a valve core 7 and a valve body shell 8. The valve core 7 is positioned in the valve body shell 8, the top of the valve core 7 is provided with a groove, the pre-tightening spring 6 is arranged in the groove, and the upper end face of the valve body shell 8 and the lower end face of the groove of the valve core 7 are directly connected. The electromagnetic coil 5 is uniformly wound outside the valve core 7. The pretension spring 6 provides a downward pretension force F s to the spool 7, and the electromagnetic coil 5 generates an upward electromagnetic force F I based on an external control current. The lower end of the valve core 7 is provided with a protruding part.
The cross section of the base part is in an I shape, and the two sides of the base part are respectively connected with the self-locking joints. The upper end surfaces of the two sides of the base are respectively communicated with the valve body through the front end connecting port and the rear end connecting port. The air flow of the front end air circuit module flows into the valve body part along the front end connecting port after passing through the front end self-locking joint and flows into the rear end self-locking joint through the rear end connecting port. The lower part of the valve core 7 is protruded to be matched with the front end connecting port.
When the valve is used, external control current flows through the electromagnetic coil 5, so that the lower protrusion of the valve core 7 is lifted, and a temporary air passage connecting the front end air passage module and the rear end air passage module is formed inside the valve body shell 8. The airway opening height is set to h. After entering through the front end self-locking joint, the air flow upwards flows through the front end connecting port, the temporary air passage and the rear end connecting port and then flows into the rear end air passage module through the rear end self-locking joint.
The back end gas circuit module comprises a back end interface 9, a back end measuring gas channel 10 and a gas flow output hole 12 which are communicated in sequence. The outer wall of the rear end measuring airway 10 is also provided with a rear end pressure measuring hole 11 for measuring the pressure of the rear end airway in real time.
Based on the adjustable gas flow measurement and control device, the pressure of the front end air flue and the rear end air flue and the magnitude of external control current are respectively measured, so that the real-time pipeline gas flow can be obtained, meanwhile, the current flow data can be obtained in real time by adjusting the external control current, and the effect of measuring and controlling an integrated body is realized. The measurement and control method provided by the invention is described in detail below.
In the embodiment, the improved electromagnetic proportional valve is directly adopted as a differential pressure type measuring element, a temporary air passage is formed in the valve core by improving the internal valve core and the base structure, gas enters the rear end air passage after passing through the temporary air passage, and the gas flow in the rear end air passage can be calculated by measuring the front and rear differential pressure data and the height of the temporary air passage. In particular, the method comprises the steps of,
And S1, acquiring the relation between the opening height h and the control current I based on valve element stress analysis.
When the opening height is h, the valve core is subjected to downward gravity G and spring pretightening force Fs, and upward hydrostatic pressure Ps and electromagnetic force F I, and the force balance formula can be known:
；
；
；
Wherein the method comprises the steps of Representing the initial spring preload,/>Representing the initial position of the spring,/>Representing the spring rate and Ps representing the hydrostatic pressure. Ps is not only related to the structure of the proportional valve, but also the total pressure of the gas source/>Related to the following. When the proportional valve measurement and control module is actually selected, the/>, is due to，/>G and Ps are discarded, so the above formula is simplified as:
；
Wherein the electromagnetic force Wherein B represents magnetic induction intensity, I represents current intensity, and L represents coil length; thus:
；
it can be seen that the opening height h is proportional to I.
And S2, calculating the gas flow based on a differential pressure type gas flow measurement principle.
The calculation formula of the traditional differential pressure type flow measuring device is as follows:
；
Wherein K represents the correction coefficient and wherein, Represents the back end air flow density, Q represents the back end flow,/>Representing the pressure difference between the front end and the rear end air paths. The invention adopts the opening of the battery proportional valve as a differential pressure hole of the differential pressure type flowmeter, and the correction coefficient K is related to the opening height h of the proportional valve. By adopting an experimental calibration or fluid simulation method, the relation between the electromagnetic proportional valve K and the electromagnetic proportional valve h can be calculated as follows:
；
based on the acquisition in step S1 The relationship of K with respect to I/>, can be obtained；
In additionThe relationship with the back-end pressure P2 is as follows:
；
wherein M represents the molar mass of the gas, R is the gas constant, and T represents the temperature;
the method is as follows:
。
When the measured current I, the front end pressure P1, and the back end pressure P2 are known, the real-time gas flow Q can be obtained.
When the proportional valve measuring and controlling module is actually used, the proportional valve measuring and controlling module determines that the gas flow can be changed in real time only by changing the control current according to the on-site gas flow demand until the target value is reached. Compared with the existing differential pressure type flow measuring device, the structure provided by the invention directly adopts the proportional valve as a front-rear differential pressure source, is not influenced by pressure loss generated by the differential pressure type flowmeter, is simpler in structure, and is more accurate in measurement.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (9)
1. An adjustable gas flow measurement and control device is characterized by comprising a front end gas circuit module, a proportional valve measurement and control module and a rear end gas circuit module which are connected in sequence; the proportional valve measurement and control module comprises a valve body part and a base part which are integrally formed; the valve body part comprises a valve body shell and an inner movable valve core; the base part is connected with the front end air channel module and the rear end air channel module, and the air channels at the two ends are communicated with the opening at the upper part of the base along the valve core; the opening height can be changed through the movement of the valve core; the front end gas circuit module and the rear end gas circuit module are respectively provided with a front end pressure measuring hole and a rear end pressure measuring hole for measuring pressure.
2. An adjustable gas flow measurement and control device based on claim 1, wherein the valve body part comprises an electromagnetic coil, a pre-tightening spring, a valve core and a valve body shell; the pre-tightening spring is respectively connected with the valve core and the valve body shell and provides a pressing force for the valve core; an electromagnetic coil is wound along the outside of the valve core, and a reverse electromagnetic force is provided by an external control current.
3. An adjustable gas flow measurement and control device based on claim 1, wherein the cross section of the base part is in an I shape, and two sides of the base part are respectively connected with a front end self-locking joint and a rear end self-locking joint; the upper end surfaces of two sides of the base are respectively communicated with the valve body part through a front end connector and a rear end connector; the lower part of the valve core is provided with a protruding part which is matched with the front end connecting port.
4. The adjustable gas flow measurement and control device based on claim 1, wherein the top of the valve core is provided with a groove, and the pre-tightening spring is arranged in the groove.
5. An adjustable gas flow measurement and control device based on claim 1, wherein the front end gas circuit module comprises a gas flow input hole, a front end measurement gas channel and a front end interface which are communicated in sequence; the side wall of the front end measuring airway is provided with a front end pressure measuring hole; the front end interface is connected to the proportional valve measurement and control module through a front end self-locking connector.
6. An adjustable gas flow measurement and control device based on claim 1, wherein the back end gas circuit module comprises a back end measurement gas channel and a gas flow output hole which are communicated in sequence; the side wall of the rear end measuring airway is provided with a rear end pressure measuring hole; the rear end self-locking connector is respectively connected with the proportional valve measurement and control module and the rear end measurement airway.
7. The measurement and control method of an adjustable gas flow measurement and control device according to any one of claims 1 to 6, comprising the steps of:
Step S1, fitting a relation between the opening height and the control current based on a valve core stress balance relation;
and S2, calculating the gas flow based on a differential pressure type gas flow measurement principle, and finally obtaining the relation between the rear end pipeline flow Q and the control current and between the front end and the rear end pressure difference.
8. The method for measuring and controlling an adjustable gas flow measuring and controlling device according to claim 7, wherein when the opening height is h in the step S1, a valve core force balance formula is as follows:
；
；
；
Wherein the method comprises the steps of Representing the pre-tightening force of a spring, wherein G represents the gravity of a valve core, F I represents the electromagnetic force and Ps represents the hydrostatic pressure; /(I)Representing the initial spring preload,/>Representing the initial position of the spring,/>Representing the spring rate; due to/>，G and Ps were discarded, as simplified below:
；
Wherein the electromagnetic force Wherein B represents magnetic induction intensity, I represents current intensity, and L represents coil length; thus:
。
9. The method for measuring and controlling an adjustable gas flow measuring and controlling device according to claim 8, wherein the formula of the conventional differential pressure type flow measurement in the step S2 is as follows:
；
Wherein K represents the correction coefficient and wherein, Represents the back end air flow density, Q represents the back end flow,/>Representing the pressure difference of the front-end gas circuit and the rear-end gas circuit;
Obtaining the relation between K and h by adopting a calibration method According to/>, obtained in step S1Find/>；
In additionThe relationship with the back-end pressure P2 is as follows:
；
wherein M represents the molar mass of the gas, R is the gas constant, and T represents the temperature;
The comprehensive preparation method comprises the following steps:
。
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| CN117633404A (en) * | 2023-11-28 | 2024-03-01 | 杭州电子科技大学 | Gas volume flow conversion method for heat exchanger air resistance measurement in open environment |
| CN117804554A (en) * | 2024-02-18 | 2024-04-02 | 苏芯物联技术(南京)有限公司 | Multi-scene applicable differential pressure type gas flow measuring device and use method |
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- 2024-04-15 CN CN202410444872.0A patent/CN118051071A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112945326A (en) * | 2021-02-23 | 2021-06-11 | 吉林大学 | Gas flow measuring device and method |
| CN115562370A (en) * | 2022-10-20 | 2023-01-03 | 广东粤港澳大湾区硬科技创新研究院 | Cooling water flow control system for excimer laser discharge cavity |
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