U.S. patent application number 14/332361 was filed with the patent office on 2014-11-06 for induced draft fan.
The applicant listed for this patent is ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD.. Invention is credited to Chuping LU, Xiongcheng WANG, Yong ZHAO.
Application Number | 20140328705 14/332361 |
Document ID | / |
Family ID | 47944930 |
Filed Date | 2014-11-06 |
United States Patent
Application |
20140328705 |
Kind Code |
A1 |
LU; Chuping ; et
al. |
November 6, 2014 |
INDUCED DRAFT FAN
Abstract
An induced draft fan, including: a fan housing, a wind wheel,
and an ECM motor including a motor body and a motor controller. The
motor controller is a control board that is not enclosed in a
control box. The control board includes a microprocessor unit, an
IGBT switch and a drive unit thereof, a detection unit for
detecting operating parameters of the motor, and a DIP switch unit.
The detection unit transmits operating parameters of the motor to
the microprocessor unit. The microprocessor unit outputs a signal
to control the IGBT switch and the drive unit thereof. An output
end of the IGBT switch and the drive unit thereof is connected to
the coil winding of the stator. An output end of the DIP switch
unit is connected to an input end of the microprocessor unit.
Inventors: |
LU; Chuping; (Zhongshan,
CN) ; ZHAO; Yong; (Zhongshan, CN) ; WANG;
Xiongcheng; (Zhongshan, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD. |
Zhongshan |
|
CN |
|
|
Family ID: |
47944930 |
Appl. No.: |
14/332361 |
Filed: |
July 15, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/CN2013/073176 |
Mar 26, 2013 |
|
|
|
14332361 |
|
|
|
|
Current U.S.
Class: |
417/410.1 |
Current CPC
Class: |
F04D 29/281 20130101;
F04D 25/08 20130101; F04D 27/004 20130101; H02P 6/08 20130101 |
Class at
Publication: |
417/410.1 |
International
Class: |
F04D 25/08 20060101
F04D025/08 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 30, 2012 |
CN |
201220315968.X |
Claims
1. An induced draft fan, comprising: a) a fan housing, the fan
housing comprising a surface; b) a wind wheel; and c) an ECM motor,
the ECM motor comprising a motor body and a motor controller; the
motor body comprising: a stator, a rotor, and a casing; the stator
comprising a coil winding; the rotor comprising a rotor shaft
comprising an end; the motor controller being a control board that
is not enclosed in a control box; the control board comprising: a
microprocessor unit comprising an input end, an IGBT switch and a
drive unit thereof comprising an output end, a detection unit for
detecting operating parameters of the motor, and a DIP switch unit
comprising an output end; wherein the wind wheel is disposed inside
the fan housing; the ECM motor is disposed on the surface of the
fan housing; the end of the rotor shaft of the rotor protrudes
inside the fan housing and is connected to the wind wheel; the
motor body is connected to the motor controller via an electric
wire; the detection unit transmits operating parameters of the
motor to the microprocessor unit; the microprocessor unit outputs a
signal to control the IGBT switch and the drive unit thereof; the
output end of the IGBT switch and the drive unit thereof is
connected to the coil winding of the stator; and the output end of
the DIP switch unit is connected to the input end of the
microprocessor unit.
2. The induced draft fan of claim 1, wherein the DIP switch unit
comprises a plurality of independent DIP switches.
3. The induced draft fan of claim 1, wherein a number of the DIP
switches is between seven and twelve.
4. The induced draft fan of claim 1, wherein the microprocessor
unit reads a signal of each DIP switch of the DIP switch unit to
form a code set, selects parameters of a rotational speed, a
torque, and an air volume, and outputs a signal to control the IGBT
switch and the drive unit thereof.
5. The induced draft fan of claim 1, wherein the control board
further comprises a gear switch detection circuit; the gear switch
detection circuit detects a plurality of gear switch signals output
by a system controller and transmits the gear switch signals to the
microprocessor; and the microprocessor outputs a signal to control
the IGBT switch and the drive unit thereof according to the gear
switch signals.
6. The induced draft fan of claim 2, wherein the control board
further comprises a gear switch detection circuit; the gear switch
detection circuit detects a plurality of gear switch signals output
by a system controller and transmits the gear switch signals to the
microprocessor; and the microprocessor outputs a signal to control
the IGBT switch and the drive unit thereof according to the gear
switch signals.
7. The induced draft fan of claim 3, wherein the control board
further comprises a gear switch detection circuit; the gear switch
detection circuit detects a plurality of gear switch signals output
by a system controller and transmits the gear switch signals to the
microprocessor; and the microprocessor outputs a signal to control
the IGBT switch and the drive unit thereof according to the gear
switch signals.
8. The induced draft fan of claim 4, wherein the control board
further comprises a gear switch detection circuit; the gear switch
detection circuit detects a plurality of gear switch signals output
by a system controller and transmits the gear switch signals to the
microprocessor; and the microprocessor outputs a signal to control
the IGBT switch and the drive unit thereof according to the gear
switch signals.
9. The induced draft fan of claim 5, wherein the gear switch
detection circuit comprises a plurality of optical coupling
isolation circuits.
10. The induced draft fan of claim 6, wherein the gear switch
detection circuit comprises a plurality of optical coupling
isolation circuits.
11. The induced draft fan of claim 7, wherein the gear switch
detection circuit comprises a plurality of optical coupling
isolation circuits.
12. The induced draft fan of claim 8, wherein the gear switch
detection circuit comprises a plurality of optical coupling
isolation circuits.
13. The induced draft fan of claim 5, wherein the microprocessor
unit is connected to a communication port; the microprocessor unit
communicates with a PC computer via the communication port; and the
PC computer sets or modifies the operating parameters of the motor
in the microprocessor by programming
14. The induced draft fan of claim 6, wherein the microprocessor
unit is connected to a communication port; the microprocessor unit
communicates with a PC computer via the communication port; and the
PC computer sets or modifies the operating parameters of the motor
in the microprocessor by programming.
15. The induced draft fan of claim 7, wherein the microprocessor
unit is connected to a communication port; the microprocessor unit
communicates with a PC computer via the communication port; and the
PC computer sets or modifies the operating parameters of the motor
in the microprocessor by programming.
16. The induced draft fan of claim 8, wherein the microprocessor
unit is connected to a communication port; the microprocessor unit
communicates with a PC computer via the communication port; and the
PC computer sets or modifies the operating parameters of the motor
in the microprocessor by programming.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation-in-part of International
Patent Application No. PCT/CN2013/073176 with an international
filing date of Mar. 26, 2013, designating the United States, now
pending, and further claims priority benefits to Chinese Patent
Application No. 201220315968.X filed Jun. 30, 2012. The contents of
all of the aforementioned applications, including any intervening
amendments thereto, are incorporated herein by reference. Inquiries
from the public to applicants or assignees concerning this document
or the related applications should be directed to: Matthias Scholl
P.C., Attn.: Dr. Matthias Scholl Esq., 245 First Street, 18.sup.th
Floor, Cambridge, Mass. 02142.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to an induced draft fan.
[0004] 2. Description of the Related Art
[0005] A typical induced draft fan, as shown in FIG. 1, is
generally driven by a single phase motor PSC, and the single phase
motor PSC is controlled by a system controller via a plurality of
gear switch signals output therefrom. However, the single phase AC
motor has low efficiency, relatively high energy consumption, large
noise, and low controllability. The technical scheme has poor
compatibility, and different application loads demand different
compatible motors, thereby resulting in long development cycle,
high management costs, poor versatility, and inconvenience in
use.
[0006] An electronically commutated motor (ECM motor), including a
DC brushless motor, a switched reluctance motor, and PMSM, is
advantageous in energy saving, intelligence, high stability and
controllability, and small noise. It is capable of regulating the
output torque and the air volume, thereby shortening the
development time and saving the development costs.
[0007] Although the ECM motors have been utilized in the induced
draft fan, it is troublesome to regulate the output power, the
rotation torque, the rotational speed, and the air volume of the
ECM motor, which demands either rewriting the control program of
the motor by professional programmers or replacing the motor,
thereby being very inconvenient.
SUMMARY OF THE INVENTION
[0008] In view of the above-described problems, it is one objective
of the invention to provide an induced draft fan that adopts an
energy-saving ECM motor to substitute for the conventional single
phase AC motor PSC and that is convenient for the user to regulate
the operating parameters of the motor.
[0009] To achieve the above objective, in accordance with one
embodiment of the invention, there is provided an induced draft
fan, comprising: a fan housing, the fan housing comprising a
surface; a wind wheel; and an ECM motor, the ECM motor comprising a
motor body and a motor controller. The motor body comprises: a
stator, a rotor, and a casing. The stator comprises a coil winding.
The rotor comprises a rotor shaft comprising an end. The motor
controller is a control board that is not enclosed in a control box
(control box-free control board). The control board comprises: a
microprocessor unit comprising an input end, an IGBT switch and a
drive unit thereof comprising an output end, a detection unit for
detecting operating parameters of the motor, and a DIP switch unit
comprising an output end. The wind wheel is disposed inside the fan
housing. The ECM motor is disposed on the surface of the fan
housing. The end of the rotor shaft of the rotor protrudes inside
the fan housing and is connected to the wind wheel. The motor body
is connected to the motor controller via an electric wire. The
detection unit transmits operating parameters of the motor to the
microprocessor unit. The microprocessor unit outputs a signal to
control the IGBT switch and the drive unit thereof. The output end
of the IGBT switch and the drive unit thereof is connected to the
coil winding of the stator. The output end of the DIP switch unit
is connected to the input end of the microprocessor unit.
[0010] In a class of this embodiment, the DIP switch unit comprises
a plurality of independent DIP switches.
[0011] In a class of this embodiment, a number of the DIP switches
is between seven and twelve.
[0012] In a class of this embodiment, the microprocessor unit reads
a signal of each DIP switch of the DIP switch unit to form a code
set, selects parameters of a rotational speed, a torque, and an air
volume, and outputs a signal to control the IGBT switch and the
drive unit thereof.
[0013] In a class of this embodiment, the control board further
comprises a gear switch detection circuit. The gear switch
detection circuit detects a plurality of gear switch signals output
by a system controller and transmits the gear switch signals to the
microprocessor. The microprocessor outputs a signal to control the
IGBT switch and the drive unit thereof according to the gear switch
signals.
[0014] In a class of this embodiment, the gear switch detection
circuit comprises a plurality of optical coupling isolation
circuits.
[0015] In a class of this embodiment, the microprocessor unit is
connected to a communication port. The microprocessor unit
communicates with a PC computer via the communication port. The PC
computer sets or modifies the operating parameters of the motor in
the microprocessor by programming.
[0016] Advantages according to embodiments of the invention are
summarized as follows:
[0017] 1) The motor controller herein is a control board that is
not enclosed in a control box. The control board is provided with
the microprocessor unit, the IGBT switch and the drive unit
thereof, and the detection unit for detecting operating parameters
of the motor. The control board is further provided with the DIP
switch unit, the output end of which is connected to the input end
of the microprocessor unit. The microprocessor unit reads
information of each DIP switch of the DIP switch unit to form the
code set, selects parameters of the rotational speed, the torque,
and the air volume, and outputs signals to control the IGBT switch
and the drive unit thereof. Thus, persons skilled in the art are
not required to know how to program, they can set the coding of the
DIP switch unit by utilizing the operation book to regulate the
parameters of the rotational speed, the torque, and the air volume
of the induced draft fan and the operation mode thereof, thereby
being simple and convenient to meet the demands of the user.
[0018] 2) The DIP switch unit comprises a plurality of independent
DIP switches. The number of the DIP switches is between seven and
fifteen, so that relatively broad information is obtained from the
code sets, thereby meeting the demands of the user.
[0019] 3) The control board is further provided with the gear
switch detection circuit that detects the gear switch signals of
the system controller and sends them to the microprocessor unit.
The microprocessor unit outputs the signal to control the IGBT
switch and the drive unit thereof according to the gear switch
signals, and is capable of communicating with the system controller
and broadening the application range thereof.
[0020] 4) The microprocessor unit is connected to the communication
port. The microprocessor unit communicates with the PC computer via
the communication port. The PC computer sets or regulates the
operating parameters of the motor in the microprocessor unit by
programming, thereby being convenient for debugging the induced
draft fan.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The invention is described hereinbelow with reference to the
accompanying drawings, in which:
[0022] FIG. 1 is a schematic diagram of a conventional induced
draft fan;
[0023] FIG. 2 is a structure diagram of an induced draft fan
according to one embodiment of the invention;
[0024] FIG. 3 is a cross sectional view of an induced draft fan
according to one embodiment of the invention;
[0025] FIG. 4 is a schematic diagram of an induced draft fan
according to one embodiment of the invention; and
[0026] FIG. 5 is a specific circuit block diagram of FIG. 4.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] For further illustrating the invention, experiments
detailing an induced draft fan are described below. It should be
noted that the following examples are intended to describe and not
to limit the invention.
[0028] As shown in FIGS. 2-5, an induced draft fan comprises: a fan
housing 1, a wind wheel 2 disposed inside the fan housing 1, and an
ECM motor disposed on a surface of the fan housing 1. The ECM motor
comprises a motor body 3 and a motor controller. The motor body
comprises: a stator 31, a rotor 32, and a casing 33. An end 320 of
a rotor shaft of the rotor 32 protrudes inside the fan housing 1
and is connected to the wind wheel 2. The motor body is connected
to the motor controller via an electric wire 5. The motor
controller is a control board 4 that is not enclosed in a control
box. The control board 4 comprises: a microprocessor unit, an IGBT
switch and a drive unit thereof, and a detection unit for detecting
operation parameters of the motor. The detection unit transmits the
operating parameters of the motor to the microprocessor unit, and
the microprocessor unit outputs a signal to control the IGBT switch
and the drive unit thereof. An output end of the IGBT switch and
the drive unit thereof is connected to a coil winding of the
stator. The control board 4 is further provided with a DIP switch
unit 6. An output end of the DIP switch unit 6 is connected to an
input end of the microprocessor unit. The DIP switch unit 6
comprises a plurality of DIP switches, and a number of the DIP
switches is between seven and fifteen. The microprocessor unit
reads a signal of each DIP switch of the DIP switch unit to form a
code set, selects parameters of a rotational speed, a torque, and
an air volume, and outputs a signal to control the IGBT switch and
the drive unit thereof. The microprocessor unit is a micro
controller unit (MCU) or a digital signal processor (DSP). The
control board 4 further comprises a gear switch detection circuit.
The gear switch detection circuit detects a plurality of gear
switch signals output by a system controller and sends the gear
switch signals to the microprocessor. The microprocessor outputs a
signal according to the gear switch signal to control the IGBT
switch and the drive unit thereof. The gear switch detection
circuit comprises a plurality of optical coupling isolation
circuits.
[0029] The microprocessor unit is connected to a communication
port. The microprocessor unit communicates with a PC computer via
the communication port. The PC computer sets or modifies the
operating parameters of the motor in the microprocessor unit by
programming.
[0030] Thus, persons skilled in the art are not required to know
how to program, they can set the coding of the DIP switch unit by
utilizing the operation book to regulate the parameters including
the rotational speed, the torque, and the air volume of the induced
draft fan and the operation mode thereof, thereby being simple and
convenient to meet the demands of the user. Definitions of
different code sets of the DIP switch unit are all recorded on the
operation book, so that it is convenient for the persons skilled in
the art to directly set the operating mode and parameters of the
induced draft fan according to actual operating environment.
EXAMPLE 1
[0031] The DIP switch unit 6 comprises nine DIP switches. When the
coding of the nine DIP switches is 001001111, the microprocessor
unit reads the information of each DIP switch of the DIP switch
unit. The coding 001001111 means that the motor operates at a
constant rotational speed of 1000 rpm. The microprocessor outputs a
corresponding signal to control the IGBT switch and the drive unit
thereof.
EXAMPLE 2
[0032] The DIP switch unit 6 comprises nine DIP switches. When the
coding of the nine DIP switches is 101011100, the microprocessor
unit reads the information of each DIP switch of the DIP switch
unit. The coding 101011100 means that the motor operates at a
constant torque of 400 N.m. The microprocessor outputs a
corresponding signal to control the IGBT switch and the drive unit
thereof.
EXAMPLE 3
[0033] The DIP switch unit 6 comprises nine DIP switches. When the
coding of the nine DIP switches is 110011001, the microprocessor
unit reads the information of each DIP switch of the DIP switch
unit. The coding 110011001 means that the motor operates at a
constant air volume. A torque is 600 N m, and a rotational speed is
800 rpm. The microprocessor outputs a corresponding signal to
control the IGBT switch and the drive unit thereof.
[0034] While particular embodiments of the invention have been
shown and described, it will be obvious to those skilled in the art
that changes and modifications may be made without departing from
the invention in its broader aspects, and therefore, the aim in the
appended claims is to cover all such changes and modifications as
fall within the true spirit and scope of the invention.
* * * * *