CN203149414U - Mass flow control device for air - Google Patents
Mass flow control device for air Download PDFInfo
- Publication number
- CN203149414U CN203149414U CN 201320173732 CN201320173732U CN203149414U CN 203149414 U CN203149414 U CN 203149414U CN 201320173732 CN201320173732 CN 201320173732 CN 201320173732 U CN201320173732 U CN 201320173732U CN 203149414 U CN203149414 U CN 203149414U
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- circuit
- circuit module
- mass flow
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- signal
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Abstract
The utility model discloses a mass flow control device for air. The mass flow control device for air comprises a gaseous mass flow sensor and a flow control electromagnetic proportional valve, wherein the gaseous mass flow sensor is connected with a signal conditioning circuit module; the signal conditioning circuit module is connected with a signal control algorithm circuit module; the signal control algorithm circuit module is connected with a signal output drive circuit module; the signal output drive circuit module is connected with the flow control electromagnetic proportional valve; the signal conditioning circuit module is connected with the signal output drive circuit module; and the signal control algorithm circuit module is connected with a control signal input circuit module. The mass flow control device for air disclosed by the utility model is capable of accurately controlling the mass flow of the device to be the received mass flow set value according to the received mass flow set value, high in accuracy, good in stability, strong in anti-interference capacity, capable of outputting the voltage signal of the monitored mass flow, and convenient to transmit the voltage signal to an upper computer or a main controller to perform screen display.
Description
Technical field
The utility model relates to a kind of air mass flow amount control device in the automation field.
Background technology
The air mass flow amount controller is used for MAF is carried out precision measurement, control.It has important effect in the production in multiple fields such as extraordinary chemical material, circuit industry, chemical industry, medicine, vacuum and environmental protection and scientific research.Its typical applications comprises: expand calculation, oxidation, extension, plasma etching, ion injection, filming equipment, optical fiber, mix gas gas distributing system, kapillary measurement and other analytical instrument.
At present, domestic air mass flow amount controller is because the control circuit design exists dispute, algorithm, parameter to select to lack science, device selects to lack the practice textual criticism, mass rate control very easily is subjected to ectocines such as temperature, pressure, electromagnetic interference (EMI), causes that the mass rate fluctuating range is big, poor stability.So how little, good stability, precision height of design discharge fluctuation, response speed is fast, reliable and stable, the working temperature pressure limit is wide, good reproducibility, easy to operate, to be convenient to the air mass flow amount controller that is connected with other controller or host computer just very necessary.
The utility model content
The purpose of this utility model provides that the fluctuation of a kind of design discharge is little, good stability, precision height, response speed is fast, reliable and stable, the working temperature pressure limit is wide, good reproducibility, easy to operate, be convenient to the air mass flow amount controller that is connected with other controller or host computer.
The technical solution adopted in the utility model is: a kind of air mass flow amount control device, comprise gas mass flow quantity sensor and flow control electromagnetic proportional valve, described gas mass flow quantity sensor connects the signal conditioning circuit module, the port A of described signal conditioning circuit module connects the port D of signal controlling algorithm circuit module, the port E of described signal controlling algorithm circuit module connects the port F of signal output driving circuit module, the port G connection traffic control electromagnetic proportional valve of described signal output driving circuit module, the port A of described signal conditioning circuit module connects the port B of signal output apparatus module, described signal controlling algorithm circuit module port C connection control signal input circuit module.Consider the stability of system, each part is fixed on the mechanical framework structure with screw, is electrically connected by connector between the module.Air-flow at first passes through mass flow sensor, mass flow sensor output monitoring voltage signal is to control circuit, drive the flow control electromagnetic proportional valve by control circuit output corresponding signal, by the different opening size of control flow control electromagnetic proportional valve, reach the purpose of control MAF.
As further improvement of the utility model, the resistance R of described signal conditioning circuit module
1Shunt capacitance C
1, constitute the RC filtering circuit; Described RC filtering circuit series connection operational amplifier LM324 constitutes buffer circuit; Resistance R
4, capacitor C
2With operational amplifier LM324 parallel connection, constitute amplifying circuit; Resistance R
7, swept resistance R
5With operational amplifier LM324 parallel connection, constitute withered circuit; Described RC filtering circuit, resistance R
2, buffer circuit, resistance R
6, withered circuit connects successively;
Described signal controlling algorithm circuit module comprises subtraction circuit, integrating circuit and the addition summing circuit of series connection successively; Described integrating circuit ratio amplifying circuit in parallel; Described subtraction circuit comprises R in parallel
10, C
8With operational amplifier LM324; Described integrating circuit comprises R in parallel
13, C
3With operational amplifier LM324; Described ratio amplifying circuit comprises R in parallel
15With operational amplifier LM324; Described addition summing circuit comprises R in parallel
22With operational amplifier LM324;
Described signal output driving circuit module comprises chip U1-3524; Resistance R
24And capacitor C
4Parallel connection is linked into 8 pin and 9 pin of chip U1-3524; Resistance R
25, R
26And capacitor C
72 pin, 4 pin and 7 pin that are linked into chip U1-3524 respectively in parallel; Resistance R
27Be linked into 14 pin of chip U1-3524.
The beneficial effect that the utility model adopts is: the utility model can be according to the mass rate setting value that receives, and the mass rate of device is controlled to be the mass rate setting value that receives accurately, and precision height, good stability, antijamming capability are strong.Can export the voltage signal of the mass rate of monitoring, be convenient to transfer to host computer or master controller and carry out screen display.
Description of drawings
Fig. 1 is the utility model synoptic diagram.
Fig. 2 is the circuit diagram of signal conditioning circuit module.
Fig. 3 is the circuit diagram of signal controlling algorithm circuit module.
Fig. 4 is the circuit diagram of signal output driving circuit module.
Fig. 5 is the circuit diagram of signal output apparatus module.
Shown in the figure: 1 signal output apparatus module, 2 signal conditioning circuit modules, 3 gas mass flow quantity sensors, 4 signal controlling algorithm circuit modules, 5 signal input circuit modules, 6 signal output driving circuit modules, 7 flow control electromagnetic proportional valves, 9 port A, 12 port B, 13 port C, 14 port D, 21 port E, 23 port F, 28 chip U1-3524,32 switching tubes, 33 port G.
Embodiment
Below in conjunction with figure, the utility model is described further.
As shown in the figure, a kind of air mass flow amount control device, comprise gas mass flow quantity sensor and flow control electromagnetic proportional valve, described gas mass flow quantity sensor connects the signal conditioning circuit module, the port A of described signal conditioning circuit module connects the port D of signal controlling algorithm circuit module, the port E of described signal controlling algorithm circuit module connects the port F of signal output driving circuit module, the port G connection traffic control electromagnetic proportional valve of described signal output driving circuit module, the port A of described signal conditioning circuit module connects the port B of signal output apparatus module, described signal controlling algorithm circuit module port C connection control signal input circuit module; The resistance R of described signal conditioning circuit
1Shunt capacitance C
1, constitute the RC filtering circuit; Described RC filtering circuit series connection operational amplifier LM324 constitutes buffer circuit; Resistance R
4, capacitor C
2With operational amplifier LM324 parallel connection, constitute amplifying circuit; Resistance R
7, swept resistance R
5With operational amplifier LM324 parallel connection, constitute withered circuit; Described RC filtering circuit, resistance R
2, buffer circuit, resistance R
6, withered circuit connects successively; Described signal controlling algorithm circuit comprises subtraction circuit, integrating circuit and the addition summing circuit of series connection successively; Described integrating circuit ratio amplifying circuit in parallel; Described subtraction circuit comprises R in parallel
10, C
8With operational amplifier LM324; Described integrating circuit comprises R in parallel
13, C
3With operational amplifier LM324; Described ratio amplifying circuit comprises R in parallel
15With operational amplifier LM324; Described addition summing circuit comprises R in parallel
22With operational amplifier LM324; Described signal output driving circuit module comprises chip U1-3524; Resistance R
24And capacitor C
4Parallel connection is linked into 8 pin and 9 pin of chip U1-3524; Resistance R
25, R
26And capacitor C
72 pin, 4 pin and 7 pin that are linked into chip U1-3524 respectively in parallel; Resistance R
27Be linked into 14 pin of chip U1-3524.
The gas mass flow quantity sensor is the air-flow air intake opening, and monitors gas mass flow in real time, exports the voltage signal of corresponding 1-5V, and mass flow sensor has been selected the hot diaphragm type gas mass flow quantity sensor of Honywell for use.Control circuit adopts Automatic Control Theory to design the PID control circuit, carry out the PID computing according to the mass rate setting value that receives and mass rate monitor value, and the pwm signal of exporting corresponding dutycycle is to the flow control electromagnetic proportional valve, what the flow control electromagnetic proportional valve was selected for use is U.S. PARKER thermal compensation formula electromagnetic proportional valve, reaches the purpose of accurate control gas mass flow by the aperture size of valve.
Described signal conditioning circuit module, input end are the monitor signal of mass flow sensor, and voltage range is 1-5V.Because the voltage signal high-frequency signal content of surveying is more, so designed R
1With C
1The RC filtering circuit of forming, filtering circuit export the buffer circuit by operational amplifier LM324 design to, can improve the input resistance of circuit like this, strengthen the driving capability of signal.For voltage signal is expanded to 0-5V, utilize operational amplifier LM324 to design the corresponding signal amplifying circuit again simultaneously, utilize R
4Can constitute different amplification coefficients, C
2For preventing circuit oscillation design.Utilize operational amplifier LM324 to design the signal balancing circuit, can pass through slide rheostat R
5The zero-point voltage of conditioning signal.Mass flow rate signal through conditioning is exported by port A.
Described port C receives the control voltage of master controller or host computer, is the voltage signal of 0-5V.Port D is output signal, and A links to each other with port.By operational amplifier LM324 and C
8And peripheral components constitutes subtraction circuit, the difference voltage of output setting value and monitor value.Control circuit has adopted parallel PID design, has constituted integrating circuit by operational amplifier LM324 and peripheral components thereof, wherein C
3Have influence on the size of integral coefficient.Operational amplifier LM324 and peripheral components thereof have constituted the ratio amplifying circuit.Ratio amplifying circuit and integrating circuit export the addition summing circuit that is made of operational amplifier LM324 respectively to.Finally by port E output voltage signal.
Described signal output driving circuit module has been made of the driving circuit of flow control electromagnetic proportional valve chip U1-3524 and accessory circuit thereof.Port F and port E join C
4With R
24It is the temperature compensation device that designs for U1-3524.By regulating R
26Value and C
7Be worth, can export the pwm signal of different frequency, the frequency range of native system is 800-1000Hz.12 pin of U1-3524,13 pin, 15 pin are the input end of power supply+15V, C
5With C
6Filtering, decoupling capacitance for the design of+15V power supply.MOSFET is switching tube, R
27Charge discharging resisting resistance for MOSFET.Diode D1 is the fly-wheel diode of flow control electromagnetic proportional valve, prevents that the flow control electromagnetic proportional valve from producing inverse electromotive force and damaging other device of circuit.Port G is the final output signal of circuit, is connected to the flow control electromagnetic proportional valve of device.
Claims (4)
1. air mass flow amount control device, comprise gas mass flow quantity sensor (3) and flow control electromagnetic proportional valve (7), it is characterized in that described gas mass flow quantity sensor (3) connects signal conditioning circuit module (2), the port A (9) of described signal conditioning circuit module (2) connects the port D (14) of signal controlling algorithm circuit module (4), the port E (21) of described signal controlling algorithm circuit module (4) connects the port F (23) of signal output driving circuit module (6), port G (33) the connection traffic control electromagnetic proportional valve (7) of described signal output driving circuit module (6), the port A (9) of described signal conditioning circuit module (2) connects the port B (12) of signal output apparatus module (1), port C (13) the connection control signal input circuit module (5) of described signal controlling algorithm circuit module (4).
2. a kind of air mass flow amount control device according to claim 1 is characterized in that the resistance R of described signal conditioning circuit module
1Shunt capacitance C
1, constitute the RC filtering circuit; Described RC filtering circuit series connection operational amplifier LM324 constitutes buffer circuit; Resistance R
4, capacitor C
2With operational amplifier LM324 parallel connection, constitute amplifying circuit; Resistance R
7, swept resistance R
5With operational amplifier LM324 parallel connection, constitute withered circuit; Described RC filtering circuit, resistance R
2, buffer circuit, resistance R
6, withered circuit connects successively.
3. a kind of air mass flow amount control device according to claim 1 is characterized in that described signal controlling algorithm circuit module comprises subtraction circuit, integrating circuit and the addition summing circuit of series connection successively; Described integrating circuit ratio amplifying circuit in parallel; Described subtraction circuit comprises R in parallel
10, C
8With operational amplifier LM324; Described integrating circuit comprises R in parallel
13, C
3With operational amplifier LM324; Described ratio amplifying circuit comprises R in parallel
15With operational amplifier LM324; Described addition summing circuit comprises R in parallel
22With operational amplifier LM324.
4. a kind of air mass flow amount control device according to claim 1 is characterized in that described flow control solenoid-operated proportional valve-driving circuit comprises chip U1-3524(28); Resistance R
24And capacitor C
4Parallel connection is linked into 8 pin and 9 pin of chip U1-3524; Resistance R
25, R
26And capacitor C
72 pin, 4 pin and 7 pin that are linked into chip U1-3524 respectively in parallel; Resistance R
27Be linked into 14 pin of chip U1-3524.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320173732 CN203149414U (en) | 2013-04-09 | 2013-04-09 | Mass flow control device for air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320173732 CN203149414U (en) | 2013-04-09 | 2013-04-09 | Mass flow control device for air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203149414U true CN203149414U (en) | 2013-08-21 |
Family
ID=48976929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320173732 Withdrawn - After Issue CN203149414U (en) | 2013-04-09 | 2013-04-09 | Mass flow control device for air |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203149414U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197693A (en) * | 2013-04-09 | 2013-07-10 | 安徽省安光环境光学工程技术研究中心有限公司 | Air mass flow rate control device |
-
2013
- 2013-04-09 CN CN 201320173732 patent/CN203149414U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197693A (en) * | 2013-04-09 | 2013-07-10 | 安徽省安光环境光学工程技术研究中心有限公司 | Air mass flow rate control device |
| CN103197693B (en) * | 2013-04-09 | 2016-08-17 | 安徽省安光环境光学工程技术研究中心有限公司 | A kind of MAF controls device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130821 Effective date of abandoning: 20160817 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |