CN216142950U - Centrifugal fan with constant power control - Google Patents
Centrifugal fan with constant power control Download PDFInfo
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- CN216142950U CN216142950U CN202120338777.4U CN202120338777U CN216142950U CN 216142950 U CN216142950 U CN 216142950U CN 202120338777 U CN202120338777 U CN 202120338777U CN 216142950 U CN216142950 U CN 216142950U
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Abstract
The utility model discloses a centrifugal fan controlled by constant power, which comprises a main control module, a motor power supply module, a variable frequency speed regulation module, a current detection module, a driving protection module and a driving motor loaded on the centrifugal fan. The main control module is respectively connected with the current detection module and the drive protection module, the drive protection circuit is connected with the variable-frequency speed regulation module, the variable-frequency speed regulation module is respectively connected with the motor power supply module and the drive motor, and the drive motor is connected with the current detection module. The current detection module is used for detecting the input current of the winding on the driving motor. The main control module controls the output frequency of the variable frequency speed regulation module, the rotating speed of the driving motor is increased, the current is increased, the output power of the fan is increased, and therefore the air volume is increased, and actual requirements are met.
Description
Technical Field
The utility model relates to the field of automation equipment control, in particular to a centrifugal fan controlled by constant power.
Background
Currently, an axial flow fan or a centrifugal fan is generally adopted in an evaporative air conditioner, and the centrifugal fan is widely used due to the advantages of low relative noise, high air pressure and the like.
The centrifugal fan mainly comprises an impeller, an air inlet, a volute and the like. When the impeller rotates, air in a flow passage formed by the blades moves outwards under the action of centrifugal force. The center of the impeller generates vacuum. Therefore, the centrifugal fan axially sucks air from the air inlet. The sucked air enters the blade channel after the inlet of the impeller is bent by 90 degrees, kinetic energy and pressure energy are obtained under the action of the blades, and the air flow thrown out of the blade channel enters the volute and is discharged from the air outlet after being concentrated and guided.
In practical engineering, an air outlet of a centrifugal fan is usually provided with an air pipe with a certain length, and the air pipe is used for conveying fresh air cooled by the centrifugal fan to various indoor positions. When the connecting air pipe is longer, the larger the air resistance of the pipeline is, the larger the air pressure required by the centrifugal fan to overcome the resistance of the pipeline is, the smaller the air quantity is, and the lower the actual power consumption is, so that the actual requirement cannot be met.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the centrifugal fan with constant power control can ensure stable output power and improve air quantity when being externally connected with air pipes with different lengths.
In order to solve the technical problems, the utility model adopts the technical scheme that:
a centrifugal fan controlled by constant power comprises a main control module, a motor power supply module, a variable frequency speed regulation module, a current detection module, a driving protection module and a driving motor loaded on the centrifugal fan;
the main control module is respectively connected with the current detection module and the driving protection module, the driving protection circuit is connected with the variable frequency speed regulation module, the variable frequency speed regulation module is respectively connected with the motor power supply module and the driving motor, and the driving motor is connected with the current detection module;
the current detection module is used for detecting the input current of the winding on the driving motor.
Further, the variable-frequency speed regulation module comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor, and a winding of the driving motor is a three-phase winding;
the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, and the sixth transistor are all insulated gate bipolar transistors, the collectors of the first transistor, the second transistor and the third transistor are all connected with the positive electrode output of the motor power supply module, an emitter of the first transistor, an emitter of the second transistor, and an emitter of the third transistor are connected to a collector of the fourth transistor, a collector of the fifth transistor, and a collector of the sixth transistor, respectively, in a one-to-one correspondence, and respectively as a first driving current output terminal, a second driving current output terminal and a third driving current output terminal, the emitting electrodes of the fourth transistor, the fifth transistor and the sixth transistor are all connected with the negative electrode output of the motor power supply module;
the first driving current output end, the second driving current output end and the third driving current output end are respectively connected with the three-way input ends of the three-phase windings in a one-to-one correspondence mode, and the grid electrode of the first transistor, the grid electrode of the second transistor, the grid electrode of the third transistor, the grid electrode of the fourth transistor, the grid electrode of the fifth transistor and the grid electrode of the sixth transistor are respectively connected with six driving signal output ends of the driving protection module in a one-to-one correspondence mode.
Furthermore, the motor power supply module comprises a single-phase power supply and a rectifier bridge, the single-phase power supply is connected with a voltage input end of the rectifier bridge, and a voltage output end of the rectifier bridge is connected with the variable-frequency speed regulation module.
The voltage output end of the rectifier bridge is connected with the voltage input end of the switch power supply, and the voltage output end of the switch power supply is connected with the power supply input end of the main control module.
Further, the device also comprises a first electrolytic capacitor and a second electrolytic capacitor;
the positive pole of the first electrolytic capacitor and the positive pole of the second electrolytic capacitor are connected with the positive pole output of the motor power supply module, and the negative pole of the first electrolytic capacitor and the negative pole of the second electrolytic capacitor are connected with the negative pole output of the motor power supply module.
Furthermore, the intelligent control system also comprises a communication interface, the master control module is connected with the communication interface, and the communication interface is used for connecting an external controller.
And one end of the resistor and one end of the switch are simultaneously connected with the positive output of the motor power supply module, and the other end of the resistor and the other end of the switch are simultaneously connected with the variable-frequency speed regulation module.
Furthermore, the motor power supply device further comprises a voltage detection module, and the voltage detection module is respectively connected with the motor power supply module and the main control module.
Furthermore, the system also comprises a relay control module, and the relay control module is connected with the main control module.
In conclusion, the beneficial effects of the utility model are as follows: the centrifugal fan controlled by constant power is provided, and the current on a motor winding is detected through a current detection module. When the detected current value is small, namely the power of the fan is reduced, the air quantity is low, the main control module controls the output frequency of the variable-frequency speed regulation module, the rotating speed of the driving motor is increased, the current is increased, the output power of the improved fan is increased, and the air quantity is increased so as to meet the actual requirement.
Drawings
Fig. 1 is a schematic diagram of an overall structure of a constant power controlled centrifugal fan according to an embodiment of the present invention;
FIG. 2 is a graph of experimental test results for a constant power controlled centrifugal fan in accordance with an embodiment of the present invention;
description of reference numerals:
1. a main control module; 2. a motor power supply module; 3. a variable frequency speed regulation module; 4. a current detection module; 5. a drive protection module; 6. a single-phase power supply; 7. a switching power supply; 8. a communication interface; 9. a voltage detection module; 10. A relay control module;
c1, a first electrolytic capacitor; c2, a second electrolytic capacitor;
g1, a first transistor; g2, a second transistor; g3, a third transistor; g4, a fourth transistor; g5, a fifth transistor; g6, a sixth transistor;
j1, a rectifier bridge;
k1, a switch;
m1, a driving motor;
r1, resistance.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 2, a centrifugal fan controlled by constant power includes a main control module 1, a motor power supply module 2, a variable frequency speed control module 3, a current detection module 4, a driving protection module 5, and a driving motor M1 loaded on the centrifugal fan;
the main control module 1 is respectively connected with the current detection module 4 and the driving protection module 5, the driving protection circuit is connected with the variable frequency speed regulation module 3, the variable frequency speed regulation module 3 is respectively connected with the motor power supply module 2 and the driving motor M1, and the driving motor M1 is connected with the current detection module 4;
the current detection module 4 is configured to detect an input current of a winding on the driving motor M1.
As apparent from the above description, the present invention provides a constant power controlled centrifugal fan, which detects the current on the motor winding through the current detection module 4. When the detected current value is small, namely the power of the fan is reduced, the air volume is low, the main control module 1 controls the output frequency of the variable frequency speed regulation module 3, the rotating speed of the driving motor M1 is increased, the current is increased, the output power of the improved fan is increased, and then the air volume is increased to meet the actual requirement.
Further, the vfd module 3 includes a first transistor G1, a second transistor G2, a third transistor G3, a fourth transistor G4, a fifth transistor G5 and a sixth transistor G6, and the winding of the driving motor M1 is a three-phase winding;
the first transistor G1, the second transistor G2, the third transistor G3, the fourth transistor G4, the fifth transistor G5 and the sixth transistor G6 are all insulated gate bipolar transistors, the collectors of the first transistor G1, the second transistor G2 and the third transistor G3 are all connected with the positive pole output of the motor power supply module, the emitter of the first transistor G1, the emitter of the second transistor G2, and the emitter of the third transistor G3 are connected to the collector of the fourth transistor G4, the collector of the fifth transistor G5, and the collector of the sixth transistor G6, respectively, in a one-to-one correspondence, and respectively as a first driving current output terminal, a second driving current output terminal and a third driving current output terminal, the emitters of the fourth transistor G4, the fifth transistor G5 and the sixth transistor G6 are all connected with the negative pole output of the motor power supply module 2;
the first driving current output end, the second driving current output end and the third driving current output end are respectively connected to the three-way input ends of the three-phase windings in a one-to-one correspondence manner, and the gate of the first transistor G1, the gate of the second transistor G2, the gate of the third transistor G3, the gate of the fourth transistor G4, the gate of the fifth transistor G5 and the gate of the sixth transistor G6 are respectively connected to six driving signal output ends of the driving protection module 5 in a one-to-one correspondence manner.
As can be seen from the above description, the first driving current output terminal, the second driving current output terminal, and the third driving current output terminal correspond to three-phase inputs of the three-phase winding, respectively. The main control module 1 controls the output frequency of the variable frequency speed control module 3 by controlling the turn-off states of the first transistor G1, the second transistor G2, the third transistor G3, the fourth transistor G4, the fifth transistor G5 and the sixth transistor G6, so as to adjust the rotation speed of the driving motor M1.
Further, the motor power supply module 2 comprises a single-phase power supply 6 and a rectifier bridge J1, wherein the single-phase power supply 6 is connected with a voltage input end of the rectifier bridge J1, and a voltage output end of the rectifier bridge J1 is connected with the variable frequency speed control module 3.
As can be seen from the above description, the motor power supply module 2 outputs a dc voltage through rectification by the rectifier bridge J1 from the ac signal output by the single-phase power supply 6, so as to supply power to the driving motor M1.
Further, the power supply also comprises a switch power supply 7, wherein a voltage output end of the rectifier bridge J1 is connected with a voltage input end of the switch power supply 7, and a voltage output end of the switch power supply 7 is connected with a power supply input end of the main control module 1.
As can be seen from the above description, since the voltage output of the rectifier bridge J1 is large and the power supply requirement voltage of the main control module 1 is small, the output of the rectifier bridge J1 is converted into the power supply signal suitable for the main control module 1 by the switching power supply 7.
Further, the electrolytic capacitor comprises a first electrolytic capacitor C1 and a second electrolytic capacitor C2;
the positive electrode of the first electrolytic capacitor C1 and the positive electrode of the second electrolytic capacitor C2 are both connected with the positive electrode output of the motor power supply module 2, and the negative electrode of the first electrolytic capacitor C1 and the negative electrode of the second electrolytic capacitor C2 are both connected with the negative electrode output of the motor power supply module 2.
As can be seen from the above description, the first electrolytic capacitor C1 and the second electrolytic capacitor C2 are connected in parallel at the output end of the motor power supply module 2, and are used for filtering out the ac component and stabilizing the dc output of the motor power supply module 2.
Further, the intelligent control system also comprises a communication interface 8, the main control module 1 is connected with the communication interface 8, and the communication interface 8 is used for connecting an external controller.
As can be seen from the above description, the communication interface 8 is used for externally connecting an external controller, and is convenient for external control with an operator.
Further, the motor control device further comprises a resistor R1 and a switch K1, wherein one end of the resistor R1 and one end of the switch K1 are connected with the positive electrode output of the motor power supply module 2, and the other end of the resistor R1 and the other end of the switch K1 are connected with the variable-frequency speed regulation module 3.
From the above description, a switch K1 is connected in parallel to the resistor R1 for controlling the voltage drop and protecting.
Further, the motor power supply device further comprises a voltage detection module 9, wherein the voltage detection module 9 is respectively connected with the motor power supply module 2 and the main control module 1.
As can be seen from the above description, the voltage detection module 9 is used to detect the output condition of the motor power supply module 2 in real time and feed back the abnormal condition in time.
Further, the intelligent control system also comprises a relay control module 10, wherein the relay control module 10 is connected with the main control module 1.
As can be seen from the above description, the main control module 1 is externally connected with a relay module, and can be used for controlling facilities such as a water valve, an exhaust valve and the like.
Referring to fig. 1 and fig. 2, a first embodiment of the present invention is:
a centrifugal fan controlled by constant power is shown in figure 1 and comprises a main control module 1, a motor power supply module 2, a variable-frequency speed regulation module 3, a current detection module 4, a drive protection module 5 and a drive motor M1 loaded on the centrifugal fan. The main control module 1 is respectively connected with the current detection module 4 and the drive protection module 5, the drive protection circuit is connected with the variable frequency speed regulation module 3, the variable frequency speed regulation module 3 is respectively connected with the motor power supply module 2 and the driving motor M1, and the driving motor M1 is connected with the current detection module 4. The current detection module 4 is used for detecting the input current of the winding on the driving motor M1. When the detected current value is small, namely the power of the fan is reduced, the air volume is low, the main control module 1 controls the output frequency of the variable frequency speed regulation module 3, the rotating speed of the driving motor M1 is increased, the current is increased, the output power of the improved fan is increased, and then the air volume is increased to meet the actual requirement.
In the embodiment, the electrolytic capacitor further comprises a first electrolytic capacitor C1, a second electrolytic capacitor C2, a resistor R1 and a switch K1. The positive electrode of the first electrolytic capacitor C1 and the positive electrode of the second electrolytic capacitor C2 are both connected with the positive electrode output of the motor power supply module 2, and the negative electrode of the first electrolytic capacitor C1 and the negative electrode of the second electrolytic capacitor C2 are both connected with the negative electrode output of the motor power supply module 2. The first electrolytic capacitor C1 and the second electrolytic capacitor C2 are used for filtering out alternating current components and stabilizing direct current output of the motor power supply module 2. In addition, one end of the resistor R1 and one end of the switch K1 are simultaneously connected with the positive output of the motor power supply module 2, and the other end of the resistor R1 and the other end of the switch K1 are simultaneously connected with the variable-frequency speed regulation module 3.
In addition, the motor power supply device further comprises a voltage detection module 9, wherein the voltage detection module 9 is respectively connected with the motor power supply module 2 and the main control module 1 and is used for detecting the output condition of the motor power supply module 2 in real time and feeding back the abnormal condition in time. The relay control module 10 is connected with the main control module 1, and the relay control module 10 is used for controlling facilities such as a water valve and an exhaust valve.
As shown in fig. 2, the constant power control corresponds to the centrifugal fan of the present embodiment. The no constant power control represents a common centrifugal fan. It can be seen from the table of fig. 2 that as the wind pressure of the wind pipe is gradually increased from 0pa, the wind volume and power of the centrifugal fan without constant power control are obviously and rapidly decreased. The air volume and power of the centrifugal fan under the constant power control in the embodiment are reduced in light weight. Under the wind pressure resistance of 220pa, the centrifugal fan of this embodiment has certain amount of wind output according to old.
Referring to fig. 1, the second embodiment of the present invention is:
based on the first embodiment, as shown in fig. 1, the variable frequency speed control module 3 includes a first transistor G1, a second transistor G2, a third transistor G3, a fourth transistor G4, a fifth transistor G5, and a sixth transistor G6, and a winding of a driving motor M1 is a three-phase winding. The first transistor G1, the second transistor G2, the third transistor G3, the fourth transistor G4, the fifth transistor G5 and the sixth transistor G6 are all insulated gate bipolar transistors, collectors of the first transistor G1, the second transistor G2 and the third transistor G3 are all connected with a positive electrode output of the motor power supply module, an emitter of the first transistor G1, an emitter of the second transistor G2 and an emitter of the third transistor G3 are respectively connected with a collector of the fourth transistor G4, a collector of the fifth transistor G5 and a collector of the sixth transistor G6 in a one-to-one correspondence manner and respectively serve as a first driving current output end, a second driving current output end and a third driving current output end, and emitters of the fourth transistor G4, the fifth transistor G5 and the sixth transistor G6 are all connected with a negative electrode output of the motor power supply module 2. The first driving current output terminal, the second driving current output terminal and the third driving current output terminal are respectively connected to the three-way input terminals of the three-phase windings in a one-to-one correspondence manner, and the gate of the first transistor G1, the gate of the second transistor G2, the gate of the third transistor G3, the gate of the fourth transistor G4, the gate of the fifth transistor G5 and the gate of the sixth transistor G6 are respectively connected to the six driving signal output terminals of the driving protection module 5 in a one-to-one correspondence manner.
In this embodiment, the vfm module 3 includes six insulated gate bipolar transistors, i.e., a first transistor G1, a second transistor G2, a third transistor G3, a fourth transistor G4, a fifth transistor G5, and a sixth transistor G6. The insulated gate bipolar transistor is a composite fully-controlled driving type power semiconductor device consisting of a bipolar triode and an insulated gate field effect transistor, and has high input impedance and reduced conduction voltage.
Referring to fig. 1, a third embodiment of the present invention is:
on the basis of the first or second embodiment, as shown in fig. 1, the motor power supply module 2 includes a single-phase power supply 6 and a rectifier bridge J1, the single-phase power supply 6 is connected to a voltage input terminal of the rectifier bridge J1, and a voltage output terminal of the rectifier bridge J1 is connected to the variable-frequency speed regulation module 3. In the motor power supply module 2, an alternating current signal output by the single-phase power supply 6 is rectified by the rectifier bridge J1 to output a direct current voltage, so as to supply power to the driving motor M1.
In this embodiment, the power supply further includes a switching power supply 7, a voltage output end of the rectifier bridge J1 is connected to a voltage input end of the switching power supply 7, and a voltage output end of the switching power supply 7 is connected to a power supply input of the main control module 1.
In summary, the present invention discloses a constant power controlled centrifugal fan, which detects the current on the motor winding through a current detection module. When the detected current value is small, namely the power of the fan is reduced, the air quantity is low, the main control module controls the output frequency of the variable-frequency speed regulation module consisting of six insulated gate bipolar transistors, the rotating speed of the driving motor is increased, the current on a three-phase winding of the driving motor is increased, the output power of the fan is increased, and therefore the air quantity is increased, and the actual requirement is met. The motor power supply module not only supplies power for the driving motor, but also supplies power for the main control module through the switch power supply. The main control module is also provided with a communication interface convenient for operators to control and a relay control module for controlling other facilities.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the contents of the present specification and the drawings, or applied to the related technical fields directly or indirectly, are included in the scope of the present invention.
Claims (9)
1. A centrifugal fan controlled by constant power is characterized by comprising a main control module, a motor power supply module, a variable frequency speed regulation module, a current detection module, a driving protection module and a driving motor loaded on the centrifugal fan;
the main control module is respectively connected with the current detection module and the driving protection module, the driving protection circuit is connected with the variable frequency speed regulation module, the variable frequency speed regulation module is respectively connected with the motor power supply module and the driving motor, and the driving motor is connected with the current detection module;
the current detection module is used for detecting the input current of the winding on the driving motor.
2. The centrifugal fan controlled by constant power as claimed in claim 1, wherein the variable frequency speed control module comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor, and the winding of the driving motor is a three-phase winding;
the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, and the sixth transistor are all insulated gate bipolar transistors, the collectors of the first transistor, the second transistor and the third transistor are all connected with the positive electrode output of the motor power supply module, an emitter of the first transistor, an emitter of the second transistor, and an emitter of the third transistor are connected to a collector of the fourth transistor, a collector of the fifth transistor, and a collector of the sixth transistor, respectively, in a one-to-one correspondence, and respectively as a first driving current output terminal, a second driving current output terminal and a third driving current output terminal, the emitting electrodes of the fourth transistor, the fifth transistor and the sixth transistor are all connected with the negative electrode output of the motor power supply module;
the first driving current output end, the second driving current output end and the third driving current output end are respectively connected with the three-way input ends of the three-phase windings in a one-to-one correspondence mode, and the grid electrode of the first transistor, the grid electrode of the second transistor, the grid electrode of the third transistor, the grid electrode of the fourth transistor, the grid electrode of the fifth transistor and the grid electrode of the sixth transistor are respectively connected with six driving signal output ends of the driving protection module in a one-to-one correspondence mode.
3. The centrifugal fan with constant power control as claimed in claim 1, wherein the motor power supply module comprises a single-phase power supply and a rectifier bridge, the single-phase power supply is connected with a voltage input end of the rectifier bridge, and a voltage output end of the rectifier bridge is connected with the variable frequency speed control module.
4. The constant-power control centrifugal fan according to claim 3, further comprising a switching power supply, wherein a voltage output terminal of the rectifier bridge is connected to a voltage input terminal of the switching power supply, and a voltage output terminal of the switching power supply is connected to a power supply input terminal of the main control module.
5. The centrifugal fan of claim 1, further comprising a first electrolytic capacitor and a second electrolytic capacitor;
the positive pole of the first electrolytic capacitor and the positive pole of the second electrolytic capacitor are connected with the positive pole output of the motor power supply module, and the negative pole of the first electrolytic capacitor and the negative pole of the second electrolytic capacitor are connected with the negative pole output of the motor power supply module.
6. The centrifugal fan controlled by constant power as claimed in claim 1, further comprising a communication interface, wherein the main control module is connected to the communication interface, and the communication interface is used for connecting an external controller.
7. The centrifugal fan controlled by constant power according to claim 1, further comprising a resistor and a switch, wherein one end of the resistor and one end of the switch are simultaneously connected with the positive output of the motor power supply module, and the other end of the resistor and the other end of the switch are simultaneously connected with the variable frequency speed control module.
8. The constant-power control centrifugal fan according to claim 1, further comprising a voltage detection module, wherein the voltage detection module is respectively connected to the motor power supply module and the main control module.
9. The constant-power controlled centrifugal fan according to claim 1, further comprising a relay control module, wherein the relay control module is connected to the main control module.
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| CN202120338777.4U CN216142950U (en) | 2021-02-05 | 2021-02-05 | Centrifugal fan with constant power control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115065229A (en) * | 2022-07-19 | 2022-09-16 | 深圳莱福德科技股份有限公司 | High power factor motor driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115065229A (en) * | 2022-07-19 | 2022-09-16 | 深圳莱福德科技股份有限公司 | High power factor motor driver |
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