CN103836766A - Air conditioner indoor unit and automatic static pressure regulating method and device thereof - Google Patents
Air conditioner indoor unit and automatic static pressure regulating method and device thereof Download PDFInfo
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Abstract
The invention belongs to the field of air conditioners, and particularly relates to an air conditioner indoor unit and an automatic static pressure regulating method and device thereof. According to the air conditioner indoor unit and the automatic static pressure regulating method and device of the air conditioner indoor unit, after the input voltage of a motor driving a wind wheel and the rotation speed of a fan are detected, the corresponding static pressure value and the rotation speed value which is needed by the motor during working are determined according to the input voltage and/or the rotation speed so as to control the input voltage of the alternating-current motor to enable the motor to reach ideal rotation speed; whether the rotation speed is within a set range or not can be further detected, if yes, automatic regulation is completed, and if not, the prior step is returned and reregulation is conducted until the rotation speed meets the requirement so that the rotation speed, the air volume and the like can be controlled to enable the indoor unit to be capable of working under various working conditions including low static pressure, medium static pressure and high static pressure. Through the design, the static pressure adjustable purpose is achieved, therefore, integrated design of the low-static-pressure, medium-static-pressure and high-static-pressure air-duct-type air conditioner indoor unit is realized, the production models of air conditioners are reduced, and the manufacturing cost is lowered.
Description
Technical field
The invention belongs to air-conditioner field, relate in particular to a kind of air conditioner room unit and automatic regulating static method and apparatus thereof.
Background technology
At present, the indoor set of air pipe type air-conditioner, in engineering actual installation process, owing to being subject to the impact of the factor such as installation environment, the air duct captain of institute degree, has different requirements to the static pressure of air pipe type air conditioner indoor unit.
Air-conditioner manufacturer, in order to meet the needs of the different installation environments in market, generally carries out differentiation design, produces low static pressure, middle static pressure and three kinds of air pipe type air conditioner indoor units of high static pressure and meets the need of market, and causes that product specification is many and versatility is poor.Although indoor set is designed to differentiated products by air-conditioner manufacturer, but due to factors such as engineering construction installation is lack of standardization, client's type selecting mistakes, on market, often there is the unmatched phenomenon of static pressure: high static pressure air pipe type air-conditioner indoor set connects unmatched airduct, even part engineering not air duct cause that electric machine temperature rise is too high, air quantity is excessive, noise is excessive, blow the situations such as water, affect comfortableness and the reliability of product, bring very large inconvenience to user.
In addition, in the time that the airduct of an air pipe type air conditioner indoor unit accesses not chummery, opening with stopping of chummery need to do not come the different air ports of switch by the controller in each room, cause the static pressure in airduct to change, as adjusted not in time the normal operation that can affect air-cooled ducted air conditioner, and the air pipe type air conditioner indoor unit of an automatic regulating static of energy just becomes the key of dealing with problems.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of automatic regulating static method and apparatus of air conditioner room unit, to solve the problem that air pipe type air conditioner indoor unit static pressure does not mate, point room control static pressure causes air-conditioning abnormal running in prior art, stop that electric machine temperature rise is too high, air quantity is excessive, noise is excessive, blow the bad phenomenon such as water.
In order to solve the problems of the technologies described above, the automatic regulating static method of air conditioner room unit provided by the invention, comprising:
Detect the input voltage of the motor that drives wind wheel;
Detect the rotating speed of described wind wheel and motor;
Determine that according to above-mentioned input voltage and/or rotating speed corresponding static pressure and described motor move required tachometer value;
The voltage of motor described in control inputs, to regulate the rotating speed of described motor and wind wheel.
As preferably, at the voltage of motor described in described control inputs, after regulating the rotating speed of described motor and wind wheel, also comprise: whether the rotating speed that judges described motor and wind wheel in preset range, is to continue operation by setting value; No, return and detect the input voltage of the motor that drives wind wheel and carry out in turn subsequent step.
The automatic regulating static device of air conditioner room unit provided by the invention comprises:
Input voltage detection module, for detection of the input voltage of motor that drives wind wheel;
Rotating speed detection module, for detection of the rotating speed of described wind wheel and motor;
Memory module, for determining that according to above-mentioned input voltage and/or rotating speed corresponding static pressure and described motor move required tachometer value;
Voltage control module, for the voltage of motor described in control inputs, to regulate the rotating speed of described motor and wind wheel; And
System control module MCU, controls for the work to above-mentioned modules.
Whether as preferably, described automatic regulating static device also comprises rotating speed correction verification module, in preset range, be to continue operation for the rotating speed that judges described motor and wind wheel; No, return and readjust.
The present invention also aims to provide a kind of air conditioner room unit, comprise housing, wind wheel parts and electric-controlled box, on described housing, be provided with air-out airduct, return air airduct and radiator, wind wheel parts comprise wind wheel and for driving the alternating current generator of wind wheel, described wind wheel parts and electric-controlled box are electrically connected by wire, as improvement, described electric-controlled box has comprised automatic regulating static device as above.
Air conditioner room unit provided by the invention and automatically regulating static method and apparatus, detect after the input voltage of motor and the rotating speed of blower fan that drives wind wheel, determine that according to above-mentioned input voltage and/or rotating speed corresponding static pressure and described motor move required tachometer value, and then the input voltage of control alternating current generator, make motor reach desired speed; Can also further detect rotating speed whether in the scope of setting, if automatically regulate complete, if otherwise return and readjust, until meet the demands, thereby control rotating speed, air quantity etc., indoor set can be worked under each operating mode of low static pressure, middle static pressure, high static pressure.By such design, reach the adjustable object of static pressure, thereby realized the integral type design of low static pressure, middle static pressure, high static pressure air pipe type air-conditioner indoor set, reduce the production type of air-conditioner, reduce manufacturing cost; The realization of static pressure adjustable function has simultaneously solved the unmatched problem of market windward tubular type air conditioner room unit static pressure, stopped that electric machine temperature rise is too high, air quantity is excessive, noise is excessive, blow the bad phenomenon such as water, while having solved the control of point room, static pressure changes and causes air-conditioning abnormal running problem.On the other hand, the installation of this indoor set, use all very conveniently, greatly improve stability and the comfortableness of air-conditioner system, can improve user's comfort level and satisfaction.
Accompanying drawing explanation
Fig. 1 is the realization flow figure of the automatic regulating static method of air conditioner room unit that provides of the embodiment of the present invention;
Fig. 2 is the oscillogram of the voltage of input motor being controlled when different static pressure in the automatic regulating static method of air conditioner room unit that provides of the embodiment of the present invention;
Fig. 3 is the structured flowchart of the automatic regulating static device of air conditioner room unit that provides of the embodiment of the present invention;
Fig. 4 is the components and parts exemplary plot of input voltage detection module in the automatic regulating static device of air conditioner room unit that provides of the embodiment of the present invention;
Fig. 5 is the automatic regulating static device of the air conditioner room unit medium speed detection module that provides of the embodiment of the present invention and the components and parts exemplary plot of voltage control module;
Fig. 6 is the components and parts exemplary plot of memory module in the automatic regulating static device of air conditioner room unit that provides of the embodiment of the present invention;
Fig. 7 is the floor map of the air conditioner room unit that provides of the embodiment of the present invention.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 is the realization flow figure of the automatic regulating static method of air conditioner room unit that provides of the embodiment of the present invention; For convenience of explanation, only show the content relevant to the present embodiment.As shown in the figure:
In step S1, detect the input voltage of the motor that drives wind wheel.
In the present embodiment, this step is to realize the steps necessary of the object of the invention.Install, start shooting operation during at air-conditioner, first detect the input voltage of the motor for driving wind wheel.
In step S2, detect the rotating speed of described wind wheel and motor.
In the present embodiment, this step is similarly the steps necessary that realizes the object of the invention,, in the time having obtained the input voltage of motor, also will obtain the real-time rotate speed of described wind wheel and motor that is.
In step S3, determine that according to above-mentioned input voltage and/or rotating speed corresponding static pressure and described motor move required tachometer value.
In the present embodiment, this step is also for realizing the steps necessary of the object of the invention, must determine corresponding static pressure and the required tachometer value of the normal operation of motor according to two steps are obtained input voltage and rotating speed above.In the time of specific implementation, have several embodiments optional: such as default be only the corresponding relation of input voltage or rotating speed and static pressure, can inquire about default correspondence table according to the different input voltages that obtain or rotating speed above and determine static pressure; Or as preferably, set in advance the corresponding relation of these two parameters of comprehensive input voltage and rotating speed and static pressure, will consider the different input voltages and the different rotating speeds that obtain above, determined corresponding static pressure.No matter be to adopt aforementioned which kind of mode to determine static pressure, all need to determine that, under this static pressure, motor moves required tachometer value.
In step S4, the voltage of motor described in control inputs, to regulate the rotating speed of described motor and wind wheel.
In the present embodiment, this step is also for realizing the steps necessary of the object of the invention.Move required tachometer value according to static pressure definite in step S3 and motor, the voltage of control inputs motor, to regulate the rotating speed of described motor and wind wheel, makes the two reach desired speed.Because direct current generator cost ratio alternating current generator is high at present, on cost, can not meet the need of market, therefore generally select alternating current generator.In the time of specific implementation, the voltage of alternating current generator is to realize by the effective length of copped wave control alternating current sine wave described in control inputs.The oscillogram of while being illustrated in figure 2 different static pressure, the voltage of input motor being controlled, in figure, shadow region is effective voltage region; By the effective length of copped wave control alternating current sine wave, thereby regulate the rotating speed of motor and wind wheel by controlling the input voltage of alternating current generator, and then control the air quantity of air-conditioner.
In step S5, whether the rotating speed that judges described motor and wind wheel in preset range, is to continue operation by setting value; No, return to step 1 and carry out in turn subsequent step.
In the present embodiment, this step is to realize the preferred steps of the object of the invention.The voltage of input motor is being controlled, regulated after the rotating speed of motor and wind wheel, whether whether the rotating speed that further detects again described motor and wind wheel in preset range, exceed default deviation range, if, self-regulating process finishes, and continues operation under existing rotating speed; If not, return to step 1 and re-start adjusting, until meet the demands, thereby control rotating speed, air quantity etc., make air conditioner room unit in low static pressure, middle static pressure, the various situations of high static pressure, carry out work.
The embodiment of the present invention also provides a kind of automatic regulating static device of air conditioner room unit, and its structured flowchart as shown in Figure 3.For convenience of explanation, only show the content relevant to the present embodiment.Referring to Fig. 3, the automatic regulating static device of air conditioner room unit comprises:
Input voltage detection module 301, for detection of the input voltage of motor that drives wind wheel;
Rotating speed detection module 302, for detection of the rotating speed of described wind wheel and motor;
System control module MCU305, controls for the work to above-mentioned modules.
As preferably, the automatic regulating static device that the present embodiment provides also comprises: whether rotating speed correction verification module 306 in preset range, is to continue operation for the rotating speed that judges described motor and wind wheel; No, return and readjust.
Fig. 4 shows the components and parts figure of a preferred input voltage detection module 301, as shown in the figure: input voltage detection module 301 is connected between alternating current and system control module MCU305, comprise transformer T1, diode D1, stamp-mounting-paper diode D2, electrochemical capacitor E1, electric capacity E2, resistance R 1, resistance R 2 and resistance R 3;
The armature winding of transformer T1 meets respectively live wire L and the zero line N of AC power, one end ground connection of the secondary windings of transformer T1, the anode of another terminating diode D1, the negative electrode of diode D1 connects the positive pole of electrochemical capacitor E1 and the first end of resistance R 2 simultaneously, the second end of resistance R 2 connects two anodes of stamp-mounting-paper diode D2 and the voltage input end of system control module MCU305 simultaneously, the public termination operating voltage of negative electrode of stamp-mounting-paper diode D2, the minus earth of electrochemical capacitor E1, resistance R 1 is connected between the anode and ground of diode D1, resistance R 3 and capacitor C 6 are attempted by between the voltage input end and ground of control module MCU305.
Fig. 5 shows the components and parts figure of a preferred rotating speed detection module 302 and voltage control module 304, as shown in the figure: rotating speed detection module 302 is connected between the feedback end and system control module MCU305 of motor M, comprises resistance R 4, stamp-mounting-paper diode D3 and capacitor C 2;
The feedback end of motor M is by the rotating speed input of resistance R 4 welding system control module MCU305, two anodes of stamp-mounting-paper diode D3 are the rotating speed input of while welding system control module MCU305 also, the public termination operating voltage of negative electrode of stamp-mounting-paper diode D3, capacitor C 2 is connected between the rotating speed input and ground of system control module MCU305.
The output of system control module MCU305 connects the control end of switching tube Q1 by resistance R 8, the hot end of switching tube Q1 connects the input of optocoupler IC1 by resistance R 7, the cold end ground connection of switching tube Q1, resistance R 9 is connected between the control end and cold end of switching tube Q1, the power supply termination operating voltage of optocoupler IC1, the first output of optocoupler IC1 meets the second plate T2 of bidirectional triode thyristor TR1 and the zero line L of alternating current simultaneously, the second output of optocoupler IC1 meets the gate pole G of bidirectional triode thyristor TR1 by resistance R 6, the first anode T1 of bidirectional triode thyristor TR1 connects the input of motor M by inductance L 1, capacitor C 3 and resistance R 5 are serially connected between the input of motor M and the zero line L of alternating current successively.
What switching tube Q1 in this Fig. 5 adopted is NPN type triode, the base stage of NPN type triode be the control end of switching tube Q1, current collection very switching tube Q1 hot end, launch the very cold end of switching tube Q1.Very apparent, switching tube Q1 also can select NMOS pipe, control end that only need be using the grid of NMOS pipe as switching tube Q1, the drain electrode cold end as the hot end of switching tube Q1, source electrode as switching tube Q1, can meet equally the needs of circuit design, be the problems such as considering cost, the circuit structure while only showing as preferred employing triode here.
Fig. 6 shows the components and parts figure of a preferred memory module 303, as shown in the figure: memory module 303 is directly connected with system control module MCU305, comprises storage chip IC2, capacitor C 4, resistance R 10, resistance R 11, resistance R 12 and resistance R 13;
The power end VCC of storage chip IC2 connects operating voltage, Enable Pin WC ground connection, the clock end SCL of storage chip IC2 and data terminal SDA are respectively by resistance R 12, resistance R 13 welding system control module MCU305, other pin ground connection of storage chip IC2, capacitor C 4 is connected between the power end VCC and ground of storage chip IC2, resistance R 10 is connected between the power end VCC and clock end SCL of storage chip IC2, and resistance R 11 is connected between the power end VCC and data terminal SDA of storage chip IC2.
The embodiment of the present invention also provides a kind of air conditioner room unit with above-mentioned automatic regulating static device, referring to Fig. 7.For convenience of explanation, Fig. 7 also only shows the content relevant to the present embodiment.
Air conditioner room unit, comprise housing 1, wind wheel parts 2 and electric-controlled box 3, on housing 1, be provided with air-out airduct 1-1, return air airduct 1-2 and radiator 1-3, electric-controlled box 3 is also arranged on housing 1,2 of wind wheel parts comprise wind wheel 2-1 and for driving the alternating current generator 2-2 of wind wheel, because the length of air-out airduct 1-1 and return air airduct 1-2 determines the size of static pressure, therefore wind wheel parts 2 are designed to meet corresponding air quantity and the performance of high static pressure of nominal.Alternating current generator 2-2 and electric-controlled box 3 are realized electrical connection by wire, in electric-controlled box 3, are provided with integrated mainboard, the integrated automatic regulating static device of above-mentioned any form in this mainboard.
Air conditioner room unit provided by the invention and automatically regulating static method and apparatus, under the control of system control module MCU, detect after the input voltage of motor and the rotating speed of blower fan that drives wind wheel by input voltage detection module and rotating speed detection module respectively, from memory module, determine that according to above-mentioned input voltage and/or rotating speed corresponding static pressure and described motor moves required tachometer value, the input voltage of voltage control module and then control alternating current generator, makes motor reach desired speed; Can also further utilize rotating speed correction verification module to detect rotating speed whether in the scope of setting, if automatically regulate complete, if readjusted otherwise return, until meet the demands, thereby control rotating speed, air quantity etc., indoor set can be worked under each operating mode of low static pressure, middle static pressure, high static pressure.By above-mentioned design, reach the adjustable object of static pressure, thereby realized the integral type design of low static pressure, middle static pressure, high static pressure air pipe type air-conditioner indoor set, reduce the production type of air-conditioner, reduce manufacturing cost; The realization of static pressure adjustable function has simultaneously solved the unmatched problem of market windward tubular type air conditioner room unit static pressure, stopped that electric machine temperature rise is too high, air quantity is excessive, noise is excessive, blow the bad phenomenon such as water, while having solved the control of point room, static pressure changes and causes air-conditioning abnormal running problem.On the other hand, the installation of this indoor set, use all very conveniently, greatly improve stability and the comfortableness of air-conditioner system, can improve user's comfort level and satisfaction.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, although the present invention has been carried out to more detailed explanation with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified or part technical characterictic is wherein equal to replacement.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. an automatic regulating static method for air conditioner room unit, is characterized in that, described method comprises:
Detect the input voltage of the motor that drives wind wheel;
Detect the rotating speed of described wind wheel and motor;
Determine that according to above-mentioned input voltage and/or rotating speed corresponding static pressure and described motor move required tachometer value;
The voltage of motor described in control inputs, to regulate the rotating speed of described motor and wind wheel.
2. automatic regulating static method as claimed in claim 1, is characterized in that, the voltage of motor described in described control inputs also comprises after regulating the rotating speed step of described motor and wind wheel:
Whether the rotating speed that judges described motor and wind wheel in preset range, is to continue operation by setting value; No, return and detect the input voltage of the motor that drives wind wheel and carry out in turn subsequent step.
3. automatic regulating static method as claimed in claim 1 or 2, it is characterized in that, describedly determine that according to input voltage and/or rotating speed it is that correspondence table by inquiring about default input voltage and/or rotating speed and static pressure is determined that corresponding static pressure and described motor move required tachometer value.
4. automatic regulating static method as claimed in claim 1 or 2, is characterized in that, the voltage of motor is to realize by the effective length of copped wave control alternating current sine wave described in described control inputs.
5. an automatic regulating static device for air conditioner room unit, is characterized in that, described device comprises:
Input voltage detection module, for detection of the input voltage of motor that drives wind wheel;
Rotating speed detection module, for detection of the rotating speed of described wind wheel and motor;
Memory module, for determining that according to above-mentioned input voltage and/or rotating speed corresponding static pressure and described motor move required tachometer value;
Voltage control module, for the voltage of motor described in control inputs, to regulate the rotating speed of described motor and wind wheel; And
System control module MCU, controls for the work to above-mentioned modules.
6. automatic regulating static device as claimed in claim 5, is characterized in that, described device also comprises:
Whether rotating speed correction verification module in preset range, is to continue operation for the rotating speed that judges described motor and wind wheel; No, return and readjust.
7. automatic regulating static device as claimed in claim 5, it is characterized in that, described input voltage detection module is connected between alternating current and system control module MCU, comprises transformer T1, diode D1, stamp-mounting-paper diode D2, electrochemical capacitor E1, electric capacity E2, resistance R 1, resistance R 2 and resistance R 3;
The armature winding of described transformer T1 connects AC power, one end ground connection of the secondary windings of described transformer T1, the anode of diode D1 described in another termination, the negative electrode of described diode D1 connects the positive pole of described electrochemical capacitor E1 and the first end of described resistance R 2 simultaneously, the second end of described resistance R 2 connects two anodes of described stamp-mounting-paper diode D2 and the voltage input end of described system control module MCU simultaneously, the public termination operating voltage of negative electrode of described stamp-mounting-paper diode D2, the minus earth of described electrochemical capacitor E1, described resistance R 1 is connected between the anode and ground of described diode D1, described resistance R 3 and capacitor C 6 are attempted by between the voltage input end and ground of described control module MCU.
8. automatic regulating static device as claimed in claim 5, is characterized in that, described rotating speed detection module is connected between the feedback end and system control module MCU of described motor, comprises resistance R 4, stamp-mounting-paper diode D3 and capacitor C 2;
The feedback end of described motor connects the rotating speed input of described system control module MCU by resistance R 4, two anodes of described stamp-mounting-paper diode D3 connect the rotating speed input of described system control module MCU simultaneously, the public termination operating voltage of negative electrode of described stamp-mounting-paper diode D3, described capacitor C 2 is connected between the rotating speed input and ground of described system control module MCU.
9. automatic regulating static device as claimed in claim 5, it is characterized in that, described voltage control module be connected on the output of described system control module MCU and the input of motor and between, comprise capacitor C 3, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, inductance L 1, bidirectional triode thyristor TR1, optocoupler IC1 and switching tube Q1;
The output of described system control module MCU connects the control end of described switching tube Q1 by resistance R 8, the hot end of described switching tube Q1 connects the input of described optocoupler IC1 by described resistance R 7, the cold end ground connection of described switching tube Q1, described resistance R 9 is connected between the control end and cold end of described switching tube Q1, the power supply termination operating voltage of described optocoupler IC1, the first output of described optocoupler IC1 connects the second plate of described bidirectional triode thyristor TR1 and the zero line of alternating current simultaneously, the second output of described optocoupler IC1 connects the gate pole of described bidirectional triode thyristor TR1 by described resistance R 6, the first anode of described bidirectional triode thyristor TR1 connects the input of described motor by described inductance L 1, described capacitor C 3 and resistance R 5 are serially connected between the input of described motor and the zero line of alternating current.
10. automatic regulating static device as claimed in claim 9, it is characterized in that, described switching tube Q1 is NPN type triode, the base stage of described NPN type triode is the control end of described switching tube Q1, the hot end of the very described switching tube Q1 of current collection of described NPN type triode, the cold end of the very described switching tube Q1 of transmitting of described NPN type triode; Or
Described switching tube Q1 is NMOS pipe, and the grid of described NMOS pipe is the control end of described switching tube Q1, and the drain electrode of described NMOS pipe is the hot end of described switching tube Q1, and the source electrode of described NMOS pipe is the cold end of described switching tube Q1.
11. automatic regulating static devices as claimed in claim 5, is characterized in that, described memory module is directly connected with described system control module MCU, comprises storage chip IC2, capacitor C 4, resistance R 10, resistance R 11, resistance R 12 and resistance R 13;
The power supply termination operating voltage of described storage chip IC2, the Enable Pin ground connection of described storage chip IC2, the clock end of described storage chip IC2 and data terminal meet described system control module MCU by described resistance R 12, resistance R 13 respectively, described capacitor C 4 is connected between the power end and ground of described storage chip IC2, described resistance R 10 is connected between the power end and clock end of described storage chip IC2, and described resistance R 11 is connected between the power end and data terminal of described storage chip IC2.
12. 1 kinds of air conditioner room units, comprise housing (1), wind wheel parts (2) and electric-controlled box (3), on described housing (1), be provided with air-out airduct (1-1), return air airduct (1-2) and radiator (1-3), wind wheel parts (2) comprise wind wheel (2-1) and for driving the alternating current generator (2-2) of wind wheel, described alternating current generator (2-2) and electric-controlled box (3) are electrically connected by wire, it is characterized in that, described electric-controlled box (3) has comprised the automatic regulating static device as described in claim 5-11 any one.
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| CN105403352A (en) * | 2015-12-31 | 2016-03-16 | 美的集团武汉制冷设备有限公司 | Method and device for detecting installation normativeness of air conditioner, and air conditioner |
| CN105444372A (en) * | 2014-09-12 | 2016-03-30 | 苏州三星电子有限公司 | Pipeline-type indoor unit and air volume control method for pipeline-type indoor unit |
| CN106288135A (en) * | 2015-06-05 | 2017-01-04 | 青岛海尔空调电子有限公司 | The method of adjustment of the rotation speed of fan of air-conditioning |
| WO2017113541A1 (en) * | 2015-12-31 | 2017-07-06 | 美的集团武汉制冷设备有限公司 | Air conditioner, air volume control method therefor and apparatus thereof |
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| CN111998494A (en) * | 2020-07-24 | 2020-11-27 | 广东积微科技有限公司 | Method and device for preventing indoor unit of high-static-pressure air duct machine from blowing water and related equipment |
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