CN203364932U - Air flow meter experiment table - Google Patents
Air flow meter experiment table Download PDFInfo
- Publication number
- CN203364932U CN203364932U CN 201320398276 CN201320398276U CN203364932U CN 203364932 U CN203364932 U CN 203364932U CN 201320398276 CN201320398276 CN 201320398276 CN 201320398276 U CN201320398276 U CN 201320398276U CN 203364932 U CN203364932 U CN 203364932U
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- experiment table
- air
- motor
- control system
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Abstract
The utility model discloses an air flow meter experiment table which comprises a base, a binding post, a first support, a second support, a third support and a control system. The binding post, the first support, the second support, the third support and the control system are arranged on the base. The first support is used for fixing an air flow meter; the support is used for fixing an air analog generating device; the third support is used for fixing a note board; the control system is connected with the air analog generating device. According to the air flow meter experiment table, PWM signals are used for driving a motor of the experiment table to work, the revolving speed of the motor can be freely adjusted, energy losses are small, the revolving speed is stable, the PWM signal drive cannot cause fall of currents passing through the motor when a resistor is heated compared with a variable resistor which can only be used on small currents, and therefore the motor cannot be clamped or burnt even if the revolving speed of the motor is reduced.
Description
Technical field
The utility model relates to a kind of air flowmeter experiment table, belongs to the auto parts machinery field.
Background technology
Existing hot film type air flowmeter experiment table changes fan electrical current by knob manual adjustments resistance sizes.This experiment table, motor can only be used on little electric current, if use the large driven current density motor, because resistance heating can cause descending by the electric current of motor, causes the rotating speed of motor to descend and the stuck motor that burns out.
Summary of the invention
Technical problem to be solved in the utility model is: a kind of lecture experiment of the air flowmeter for teaching, study, research institute stand is provided, has solved air flowmeter experiment table motor and be difficult to the problem with large driven current density.
The utility model, for solving the problems of the technologies described above, adopts following technical scheme:
A kind of air flowmeter experiment table, comprise base, binding post, the first to the 3rd support, control system; Described binding post, the first to the 3rd support, set-up of control system are on base; Described the first support is for the fixed air flowmeter; Described the second support is for the fixed-analog air generator; Described the 3rd support is used for fixedly note board; Described control system is connected with the simulated air generating means.
Described control system comprises control module, display module, power supply processing module; Wherein said display module, simulated air generating means are connected with described control module respectively; Described power supply processing module is connected with display module, control module, simulated air generating means respectively.
Described power supply processing module comprises transforming circuit, rectification circuit, filtering circuit, mu balanced circuit.
Described control module comprises manual control circuit, automatic control circuit.
According to the described air flowmeter experiment table of above any one claim, it is characterized in that: stating the simulated air generating means is the direct current generator fan.
Compared with prior art, the utlity model has following beneficial effect:
The utility model adopts pwm signal to drive the machine operation of experiment table, but free adjustment motor speed, the little energy of loss, rotating speed is steady, compare the variable resistor that can only be used on little electric current, pwm signal drives the electric current that can not cause because of resistance heating by motor to descend, and causes the rotating speed of motor to descend and the stuck motor that burns out.
The accompanying drawing explanation
Fig. 1 is the utility model structured flowchart.
Fig. 2 is the utility model block diagram of system.
Wherein, being denoted as in figure: 1-base; The 2-binding post; 3-direct current generator blower tray; 4-flowmeter support; 5-note board support.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is elaborated:
As shown in Figure 1, a kind of air flowmeter experiment table, comprise the binding post 2, the first to the 3rd support, the control system that are arranged on base 1; Wherein, the first support is that flowmeter support 4, the second support are that direct current generator blower tray 3, the 3rd support are note board support 5; Described flowmeter support 4 is for the fixed air flowmeter; Described direct current generator blower tray 3 is for fixing direct current generator fan; Described note board support 5 is for fixing note board; Described control system is connected with the direct current generator fan.
The utility model system forms as shown in Figure 2, and described control system comprises system control module, display module, power supply processing module; Wherein said display module, simulated air generating means are connected with described system control module respectively; Described system control module output pwm signal control simulation air generator work; Described display module shows the duty of air flowmeter; Described power supply processing module is connected with display module, system control module, simulated air generating means respectively, is display module, system control module, the power supply of simulated air generating means.
Each functions of modules of the utility model and principle of work are as follows:
Described power supply processing module comprises transforming circuit, rectification circuit, filtering circuit, mu balanced circuit.
(1) energy supply control module
Input voltage is AC 220V or DC 12V.When input DC 12V, power supply is directly given the next stage circuit supply; As input AC 220V, need through transformer pressure-reducing, be first AC 12V, then through four commutator tube rectifications, after capacitor filtering, obtain a direct current that is about 12V.But preferably do not input AC 220V, DC 12V simultaneously.The DC12V output voltage arranges two-way, with the first switch, second switch, controls respectively, and wherein a road is the air flowmeter power supply, and another road is the DC fan motor power supply.
(2) feed circuit of air flowmeter
After closed the first switch, the DC12V voltage of power supply output after 7805 and 7,812 two trifocal integrated regulators, then respectively output+5V and+12V voltage, distinguish No. 4, No. 2 terminals of air supply flowmeter itself, meet the job requirement of flowmeter.The power light of flowmeter is bright.
(3) feed circuit of direct current generator fan
After closed second switch, the DC12V voltage of power supply output after 7805 and 7,812 two trifocal integrated regulators, then respectively output+5V and+12V voltage ,+12V voltage is the direct current generator power supply ,+5V voltage is that the motor internal control chip is powered.Due to the electric capacity effect at motor two ends, the brush of motor is protected.The motor power pilot lamp is bright.
(4) control circuit of motor
The control of motor has two kinds of patterns: a kind of is manual control model, and another kind is automatic control mode.The 3rd switch is set, for the switching of manual mode and automatic mode; Manual mode signal lamp and automatic mode signal lamp are set.When the 3rd switching over during to manual mode, corresponding manual mode pilot lamp is bright, show manual control model work, the variable-resistance size of manual adjustments just can have been controlled the dutycycle of output pulse, signal is controlled direct current generator work through control circuit, realizes the electrodeless variable-speed of direct current generator fan.
When the 3rd switching over, during to automatic mode, corresponding automatic mode pilot lamp is lighted, automatic mode operation, control chip is by predefined parameter output pwm signal, the work of control direct current generator, also just controlled the working condition of motor indirectly, realized automatic control.
Claims (5)
1. an air flowmeter experiment table, is characterized in that: comprise base, binding post, the first to the 3rd support, control system; Described binding post, the first to the 3rd support, set-up of control system are on base; Described the first support is for the fixed air flowmeter; Described the second support is for the fixed-analog air generator; Described the 3rd support is used for fixedly note board; Described control system is connected with the simulated air generating means.
2. air flowmeter experiment table according to claim 1, it is characterized in that: described control system comprises control module, display module, power supply processing module; Wherein said display module, simulated air generating means are connected with described control module respectively; Described power supply processing module is connected with display module, control module, simulated air generating means respectively.
3. air flowmeter experiment table according to claim 2, it is characterized in that: described power supply processing module comprises transforming circuit, rectification circuit, filtering circuit, mu balanced circuit.
4. air flowmeter experiment table according to claim 2, it is characterized in that: described control module comprises manual control circuit, automatic control circuit.
5. according to the described air flowmeter experiment table of above any one claim, it is characterized in that: described simulated air generating means is the direct current generator fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320398276 CN203364932U (en) | 2013-07-05 | 2013-07-05 | Air flow meter experiment table |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320398276 CN203364932U (en) | 2013-07-05 | 2013-07-05 | Air flow meter experiment table |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203364932U true CN203364932U (en) | 2013-12-25 |
Family
ID=49812679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320398276 Expired - Fee Related CN203364932U (en) | 2013-07-05 | 2013-07-05 | Air flow meter experiment table |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203364932U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323081A (en) * | 2013-07-05 | 2013-09-25 | 无锡商业职业技术学院 | Air flowmeter experiment table |
-
2013
- 2013-07-05 CN CN 201320398276 patent/CN203364932U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323081A (en) * | 2013-07-05 | 2013-09-25 | 无锡商业职业技术学院 | Air flowmeter experiment table |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20140705 |
|
| EXPY | Termination of patent right or utility model |