CN112112832B - Automatic adjusting method for rotating speed of fan - Google Patents
Automatic adjusting method for rotating speed of fan Download PDFInfo
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- CN112112832B CN112112832B CN202011003391.4A CN202011003391A CN112112832B CN 112112832 B CN112112832 B CN 112112832B CN 202011003391 A CN202011003391 A CN 202011003391A CN 112112832 B CN112112832 B CN 112112832B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
A method for automatically adjusting the rotating speed of a fan comprises the steps of obtaining the heating value of a vibration table, and sending the heat required to be conducted by the vibration table to a fan control module; obtaining the volume of the gas taken away by the fan: if the temperature of the vibration table is not changed, the heat productivity of the vibration table is the heat dissipation capacity of the fan, and the fan control module calculates the volume of the air taken away by the fan according to the heat dissipation capacity of the fan, the environment temperature value and the temperature value of the air outlet of the fan; adjusting the rotating speed of the fan: the fan control module calculates the air speed of the fan according to the volume of the air taken away by the fan, and then adjusts the rotating speed of the fan according to the air speed of the fan; adjusting the rotating speed in real time: the method comprises the steps of collecting exciting coil voltage, exciting coil resistance, moving coil current and moving coil resistance in real time, then calculating the wind speed of a fan, and then adjusting the rotating speed of the fan in real time according to the wind speed of the fan. Compared with the prior art, the invention can adjust the rotating speed of the fan in real time in the working process of the vibrating table, and the power of the fan is in direct proportion to the third power of the rotating speed of the fan, thereby greatly improving the energy utilization rate.
Description
Technical Field
The invention relates to the technical field of electric vibration table control, in particular to a method for automatically adjusting the rotating speed of a fan.
Background
The country carries out the development directions of energy conservation, emission reduction, digitization and intellectualization, the domestic electric vibration table of the environmental test equipment is still the technology of the last century at present, the development of all aspects is difficult to keep pace with the development of the times, and the development of higher performance, high intelligence and high power density is imperative.
The control mode of the electric vibration table fan in the existing market is that the electric vibration table fan is directly connected with commercial power through a contactor for control, the fan control cannot automatically regulate the speed, and the running noise and the impact of the startup and shutdown on a power grid cannot be reduced.
Therefore, it is necessary to provide a new method for automatically adjusting the rotational speed of the fan to solve the above technical problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic fan rotating speed adjusting method capable of adjusting the rotating speed of a fan in real time according to vibration experiment requirements.
The invention discloses a technical scheme for solving the technical problem, and discloses a method for automatically adjusting the rotating speed of a fan, which comprises the following steps:
obtaining the calorific value of the vibrating table: calculating the heat productivity of the vibration table according to the type and magnitude of the experiment to be performed, and sending the heat productivity of the vibration table to the fan control module;
obtaining the volume of the gas taken away by the fan: if the temperature of the vibration table is not changed, the heat productivity of the vibration table is the heat dissipation capacity of the fan, and the fan control module calculates the volume of the air taken away by the fan according to the heat dissipation capacity of the fan, the environment temperature value and the temperature value of the air outlet of the fan;
adjusting the rotating speed of the fan: the fan control module calculates the air speed of the fan according to the volume of air taken away by the fan, and then adjusts the rotating speed of the fan according to the air speed of the fan;
adjusting the rotating speed in real time: the method comprises the steps of collecting excitation coil voltage, excitation coil resistance, moving coil current and moving coil resistance in real time, calculating the wind speed of a fan according to the excitation coil voltage, the excitation coil resistance, the moving coil current and the moving coil resistance, and then adjusting the rotating speed of the fan in real time according to the wind speed of the fan.
Preferably, the method further comprises the steps of obtaining heat required by temperature rise of the vibrating table after the step of obtaining the heat productivity of the vibrating table and before the step of obtaining the volume of the gas taken away by the fan, wherein the difference between the heat productivity of the vibrating table and the heat required by the temperature rise of the vibrating table is the heat dissipation capacity of the fan; and sending the heat dissipation capacity of the fan to a fan control module.
Preferably, the heat required for the temperature rise of the vibration table comprises heat required for the temperature rise of the excitation coil and heat required for the temperature rise of the moving coil, and the heat required for the temperature rise of the excitation coil and the heat required for the temperature rise of the moving coil are obtained through an excitation coil temperature rise formula and a moving coil temperature rise formula respectively.
Preferably, the exciting coil temperature rise formula is as follows: q1＝S1*α*(T1-T3) Wherein Q is1Heat required for heating the field coil, S1Is the heat dissipation area of the exciting coil, c is the heat transfer efficiency, T1Is the temperature, T, of the field coil3Is ambient temperature.
Preferably, the moving coil temperature rise formula is as follows: q2＝S2*α*(T2-T3) Wherein Q is2Heat required for heating the moving coil, S2Is the heat dissipation area of the moving coil, alpha is the heat transfer efficiency, T2Temperature of moving coil, T3Is ambient temperature.
Preferably, the calculating the heat productivity of the vibration table according to the type and magnitude of the experiment performed in advance includes: obtaining excitation coil voltage, excitation coil resistance, moving coil current and moving coil resistance according to the type and magnitude of a pre-performed experiment; and calculating the heating value of the vibration table according to the obtained excitation coil voltage, the excitation coil resistance, the moving coil current and the moving coil resistance.
Preferably, the heating value of the vibrating table comprises a heating value of an exciting coil and a heating value of a moving coil, the heating value of the exciting coil is obtained through an exciting coil power formula, and the heating value of the moving coil is obtained through a moving coil power formula;
the excitation coil power formula is as follows:
wherein Q1Heat generated for the exciting coil, VfIs the field coil voltage, RfIs the resistance of the exciting coil, and t is time;
the moving coil power formula is as follows: q2＝Id2Rd t, wherein Q2Id is moving coil current, Rd is moving coil resistance, and t is time.
Preferably, the volume of the gas taken away by the fan is obtained by a fan air volume heat transfer formula, and the fan air volume heat transfer formula is as follows: wherein Q is windHeat dissipation capacity, V is the volume of air taken away by the fan, rho is the air density, C is the air specific heat, and T is4Is the temperature of the air outlet, T3Is ambient temperature.
Preferably, the wind speed of the fan is obtained by a fan rotating speed formula, and the fan rotating speed formula is as follows: v ═ S ═ VtT, wherein V is the volume of the fan carrying the gas away, VtThe wind speed is S is the sectional area of the wind channel, and t is time.
Compared with the prior art, the invention can adjust the rotating speed of the fan in real time in the working process of the vibration table and control the temperature of the vibration table within a preset range. The fan power is in direct proportion to the third power of the rotating speed of the fan, namely the rotating speed of the fan is reduced by 1/2, the required fan power is only 1/8 as compared with the required fan power which is reduced by 87.5 percent under normal work. The energy utilization rate is greatly improved. Secondly, the running noise and the running energy loss are reduced, and the impact of sudden change of the on-off rotating speed of the fan on the mains voltage is avoided.
Drawings
Fig. 1 is a schematic view of the working process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The generation of heat of the electric vibration table body mainly comes from 2 aspects: excitation coil and movable coil.
Referring to fig. 1, the method for automatically adjusting the rotating speed of the fan in the embodiment includes the following steps:
step 1, obtaining the calorific value of a vibration table: obtaining an excitation coil voltage V1, an excitation coil resistor R1, a moving coil current I1 and a moving coil resistor R2 according to the type and magnitude of a pre-performed experiment; the heating value Q1 of the exciting coil is obtained through an exciting coil power formula, the heating value Q2 of the moving coil is obtained through a moving coil power formula, and the heating value of the vibrating table comprises the heating value Q1+ Q2 of the exciting coil and the heating value of the moving coil, namely the heating value Q1+ Q2 of the vibrating table. The heating value of the vibration table is the heat quantity which needs to be conducted by the vibration table, and the heat quantity which needs to be conducted by the vibration table is sent to the fan control module.
The excitation coil power formula is:
wherein Q1Heat quantity of exciting coil, VfIs the field coil voltage, RfIs the resistance of the exciting coil, and t is time;
the moving coil power formula is as follows: q2＝Id2Rd t, wherein Q2Id is the moving coil heating value, Rd is the moving coil current, Rd is the moving coil resistance, and t is the working time of the vibration table.
Step 2, obtaining the heat dissipation capacity of the fan: the fan heat dissipation is the difference between the heat productivity of the vibration table and the heat required by the temperature rise of the vibration table, the heat required by the temperature rise of the vibration table is Q3, namely the fan heat dissipation is: q1+ Q2-Q3. The heat required by the temperature rise of the vibrating table comprises heat required by the temperature rise of the exciting coil and heat required by the temperature rise of the moving coil, the fan control module obtains the heat Q4 required by the temperature rise of the exciting coil through an exciting coil temperature rise formula, the fan control module obtains the heat Q5 required by the temperature rise of the moving coil through a moving coil temperature rise formula, and then Q3 is Q4+ Q5. The temperature of the vibration table rises, and can form a temperature difference with the ambient temperature, and the purpose of establishing the temperature difference is to effectively reduce energy consumption and improve energy utilization rate for better energy and faster conduction.
The exciting coil temperature rise formula is as follows: q1＝S1*α*(T1-T3) Wherein Q is1Heat required for heating the field coil, S1Is the heat dissipation area of the excitation coil, alpha is the heat transfer efficiency, T1Is the temperature, T, of the field coil3Is ambient temperature. Heat transfer efficiency alpha, temperature T of exciting coil1And the ambient temperature T3May be obtained by a detection device.
The moving coil temperature rising formula is as follows: q2＝S2*α*(T2-T3) Wherein Q is2Heat required for heating the moving coil, S2Is the heat dissipation area of the moving coil, alpha is the heat transfer efficiency, T2Temperature of moving coil, T3Is ambient temperature. Heat transfer efficiency alpha, temperature T of moving coil2And the ambient temperature T3May be obtained by a detection device.
It should be noted that: after the vibration table is produced, the heat dissipation areas of the excitation coil and the moving coil are determined.
Step 3, obtaining the volume of the air taken away by the fan: and (3) after the fan heat dissipation capacity Q1+ Q2-Q3 in the step (2) is obtained, calculating the volume L1 of the air taken away by the fan according to a fan air volume heat transfer formula.
Fan air volume heat transfer formula: wherein Q is the heat dissipation capacity of the fan; v is the volume of the air taken away by the fan, rho is the air density, C is the air specific heat, and T is4Is the temperature of the air outlet, T3Is ambient temperature. Air density ρ|Specific heat of air C and air outlet temperature T4And the ambient temperature T3May be obtained by a detection device.
If the temperature of the vibration table needs to be kept constant, namely the temperature of the excitation coil is equal to the ambient temperature, the heat Q4 required by the temperature rise of the excitation coil is 0; the temperature of the moving coil is equal to the ambient temperature, and the heat Q5 required by the temperature rise of the moving coil is 0; the heat Q3 required for the temperature rise of the oscillating table is 0; the fan heat dissipation Q is equal to the vibration table heat generation Q1+ Q2. The temperature of the vibration table is well controlled in the mode, but the energy consumption is increased due to the fact that the energy transmission is slow because of no temperature difference.
Step 4, adjusting the rotating speed of the fan: and (3) after the fan control module obtains the volume L1 of the air taken away by the fan in the step (3), obtaining the wind speed F1 of the fan according to a fan rotating speed formula.
The fan rotation speed formula: v ═ S ═ VtT, wherein V is the volume of the fan carrying the gas away, VtThe wind speed is S is the sectional area of the wind channel, and t is time. It should be noted that, after the fan is manufactured, the sectional area S of the air duct is already confirmed.
Since the wind speed of the fan is proportional to the rotational speed of the fan, the rotational speed n1 of the fan can be obtained according to the wind speed F1 of the fan.
Step 5, adjusting the rotating speed in real time: the method comprises the steps of collecting excitation coil voltage V2, excitation coil resistance R3, moving coil current I2 and moving coil resistance R4 in real time, calculating the wind speed F2 of the fan according to the excitation coil voltage V2, the excitation coil resistance R3, the moving coil current I2 and the moving coil resistance R4 in steps 1-4 by a fan control module, and then adjusting the rotating speed n2 of the fan in real time according to the wind speed F2 of the fan.
The invention can adjust the rotating speed of the fan in real time in the working process of the vibration table and control the temperature of the vibration table within a preset range. The fan power is in direct proportion to the third power of the rotating speed of the fan, namely the rotating speed of the fan is reduced by 1/2, the required fan power is only 1/8 as compared with the required fan power which is reduced by 87.5 percent under normal work. The energy utilization rate is greatly improved. Secondly, the running noise and the running energy loss are reduced, and the impact of sudden change of the on-off rotating speed of the fan on the mains voltage is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A method for automatically adjusting the rotating speed of a fan is characterized by comprising the following steps:
obtaining the calorific value of the vibrating table: calculating the heat productivity of the vibration table according to the type and magnitude of the experiment to be performed, and sending the heat productivity of the vibration table to the fan control module;
obtaining the volume of the gas taken away by the fan: if the temperature of the vibration table is not changed, the heat productivity of the vibration table is the heat dissipation capacity of the fan, and the fan control module calculates the volume of the air taken away by the fan according to the heat dissipation capacity of the fan, the environment temperature value and the temperature value of the air outlet of the fan;
adjusting the rotating speed of the fan: the fan control module calculates the air speed of the fan according to the volume of air taken away by the fan, and then adjusts the rotating speed of the fan according to the air speed of the fan;
adjusting the rotating speed in real time: acquiring excitation coil voltage, excitation coil resistance, moving coil current and moving coil resistance in real time, calculating the wind speed of the fan according to the excitation coil voltage, the excitation coil resistance, the moving coil current and the moving coil resistance, and then adjusting the rotating speed of the fan in real time according to the wind speed of the fan;
the method comprises the steps of obtaining the heat quantity required by the temperature rise of the vibration table after the step of obtaining the heat quantity of the vibration table and before the step of obtaining the volume of the gas taken away by the fan, wherein the difference between the heat quantity of the vibration table and the heat quantity required by the temperature rise of the vibration table is the heat dissipation quantity of the fan; sending the heat dissipation capacity of the fan to a fan control module;
the heat required by the temperature rise of the vibrating table comprises heat required by the temperature rise of the exciting coil and heat required by the temperature rise of the moving coil, and the heat required by the temperature rise of the exciting coil and the heat required by the temperature rise of the moving coil are obtained through an exciting coil temperature rise formula and a moving coil temperature rise formula respectively.
2. The method of claim 1, wherein the exciting coil temperature raising formula is as follows:
wherein
The heat required for heating the exciting coil,
is the heat dissipation area of the excitation coil,
in order to be efficient in the heat transfer,
it is the temperature of the exciting coil that,
is ambient temperature.
3. The method according to claim 2, wherein the method comprises the step of automatically adjusting the rotational speed of the fanCharacterized in that the moving coil temperature rising formula is as follows:
wherein
The heat required for heating the moving coil,
is the heat dissipation area of the moving coil,
in order to be efficient in the heat transfer,
it is the temperature of the moving coil that,
is ambient temperature.
4. The method for automatically adjusting the rotating speed of the fan according to claim 3, wherein the step of calculating the heating value of the vibration table according to the type and the magnitude of the experiment to be performed comprises the following steps: obtaining excitation coil voltage, excitation coil resistance, moving coil current and moving coil resistance according to the type and magnitude of a pre-performed experiment; and calculating the heating value of the vibration table according to the obtained excitation coil voltage, the excitation coil resistance, the moving coil current and the moving coil resistance.
5. The automatic fan speed adjustment method according to claim 4, wherein the heating value of the vibration table comprises a heating value of an excitation coil and a heating value of a moving coil, the heating value of the excitation coil is obtained through an excitation coil power formula, and the heating value of the moving coil is obtained through a moving coil power formula;
the excitation coil power formula is as follows:
wherein
In order to generate heat for the exciting coil,
is the voltage of the exciting coil and is,
is a resistance of the exciting coil,tis time;
the moving coil power formula is as follows:
wherein
In order to generate heat for the moving coil,Idin order to obtain the current of the moving coil,Rdis a resistance of a moving coil, and is a resistance of a moving coil,tis time.
6. The method for automatically adjusting the rotating speed of the fan as claimed in claim 5, wherein the volume of the air taken away by the fan is obtained by a fan air volume heat transfer formula, and the fan air volume heat transfer formula is as follows:
wherein
The heat dissipation capacity of the fan is shown, V is the volume of the air taken away by the fan,
c is the specific heat of air,
the temperature of the air outlet is used as the temperature of the air outlet,
is ambient temperature.
7. The method for automatically adjusting the rotating speed of the fan according to claim 6, wherein the wind speed of the fan is obtained by a fan rotating speed formula, and the fan rotating speed formula is as follows:
wherein V is the volume of the air taken away by the fan,
is the wind speed, S is the sectional area of the wind channel,tis time.
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| CN202011003391.4A CN112112832B (en) | 2020-09-22 | 2020-09-22 | Automatic adjusting method for rotating speed of fan |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101281087A (en) * | 2008-05-13 | 2008-10-08 | 苏州试验仪器总厂 | Dynamoelectric oscillating table excitation voltage automatic adjusting method |
| CN103014329A (en) * | 2012-12-27 | 2013-04-03 | 中冶长天国际工程有限责任公司 | Control method of annular cooling air blower |
| CN104704338A (en) * | 2012-10-03 | 2015-06-10 | 爱美克株式会社 | Vibration generator |
| CN106255392A (en) * | 2016-09-21 | 2016-12-21 | 珠海格力电器股份有限公司 | Heat dissipation control method, device and system for electrical cabinet |
| KR20170011673A (en) * | 2015-07-24 | 2017-02-02 | (주)케이엔알시스템 | The Vibration Table for High Accelerated Life Test |
| CN106679917A (en) * | 2016-12-30 | 2017-05-17 | 脉创测控装备科技（苏州）有限公司 | Integrated vibration test system and energy consumption management method thereof |
| CN107607278A (en) * | 2017-09-01 | 2018-01-19 | 苏州东菱振动试验仪器有限公司 | A kind of energy-saving and noise-reducing control method and device of shake table |
-
2020
- 2020-09-22 CN CN202011003391.4A patent/CN112112832B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281087A (en) * | 2008-05-13 | 2008-10-08 | 苏州试验仪器总厂 | Dynamoelectric oscillating table excitation voltage automatic adjusting method |
| CN104704338A (en) * | 2012-10-03 | 2015-06-10 | 爱美克株式会社 | Vibration generator |
| CN103014329A (en) * | 2012-12-27 | 2013-04-03 | 中冶长天国际工程有限责任公司 | Control method of annular cooling air blower |
| KR20170011673A (en) * | 2015-07-24 | 2017-02-02 | (주)케이엔알시스템 | The Vibration Table for High Accelerated Life Test |
| CN106255392A (en) * | 2016-09-21 | 2016-12-21 | 珠海格力电器股份有限公司 | Heat dissipation control method, device and system for electrical cabinet |
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