CN111059736A - Constant air volume control method for air conditioning system - Google Patents

Constant air volume control method for air conditioning system Download PDF

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Publication number
CN111059736A
CN111059736A CN201911230137.5A CN201911230137A CN111059736A CN 111059736 A CN111059736 A CN 111059736A CN 201911230137 A CN201911230137 A CN 201911230137A CN 111059736 A CN111059736 A CN 111059736A
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China
Prior art keywords
fan
air
wind resistance
rotating speed
resistance coefficient
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Inventor
董明珠
梁博
陶梦春
林金煌
张杰添
姜学想
曾庆和
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201911230137.5A priority Critical patent/CN111059736A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/75—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity for maintaining constant air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a constant air volume control method of an air conditioning system. The constant air volume control method is suitable for the air conditioning system with the filter screen arranged at the air outlet, and comprises the following steps: detecting operating parameters of a fan of an air conditioning system; acquiring the power P of the fan according to the operation parameters; obtaining a wind resistance coefficient Kp according to the power P, adjusting the rotating speed n of the fan through the wind resistance coefficient Kp, or obtaining the wind resistance coefficient variation delta Kp of the wind resistance coefficient Kp in a preset time according to the power variation delta P of the power P in the preset time, and adjusting the rotating speed n of the fan through the wind resistance coefficient variation delta Kp to enable the air volume blown out of the fan to be the preset air output Q all the time; wherein the operating parameter comprises a current value and/or a voltage value. The invention effectively solves the problem that the air output of the air conditioning system is reduced due to dirty and blocked filter screens in the prior art.

Description

Constant air volume control method for air conditioning system
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to a constant air volume control method of an air conditioning system.
Background
At present, filter screens are arranged at air outlets of indoor units of air conditioners, dust is filtered and then deposited on the filter screens, and the filter screens need to be cleaned regularly by users, otherwise, secondary pollution is caused due to easy bacterial breeding. Meanwhile, the dust affects the air supply volume and the air supply distance of the air-conditioning indoor unit, so that the air supply volume of the air-conditioning indoor unit is reduced, and further the working efficiency and the user experience of the air-conditioning indoor unit are affected.
Disclosure of Invention
The invention mainly aims to provide a constant air volume control method of an air conditioning system, which aims to solve the problem that the air volume of the air conditioning system is reduced due to dirty and blocked filter screens in the prior art.
In order to achieve the aim, the invention provides a constant air volume control method of an air conditioning system, which is suitable for the air conditioning system with a filter screen arranged at an air outlet, and comprises the following steps: detecting operating parameters of a fan of an air conditioning system; acquiring the power P of the fan according to the operation parameters; obtaining a wind resistance coefficient Kp according to the power P, adjusting the rotating speed n of the fan through the wind resistance coefficient Kp, or obtaining the wind resistance coefficient variation delta Kp of the wind resistance coefficient Kp in a preset time according to the power variation delta P of the power P in the preset time, and adjusting the rotating speed n of the fan through the wind resistance coefficient variation delta Kp to enable the air volume blown out of the fan to be the preset air output Q all the time; wherein the operating parameter comprises a current value and/or a voltage value.
Further, the wind resistance coefficient Kp is obtained according to the power P, or the wind resistance coefficient variation delta of the wind resistance coefficient Kp in the preset time is obtained according to the power variation delta P of the power P in the preset timeThe Kp mode is as follows: using the formula n3P × Kp; the rotating speed n is constant, and the variation of the power P is consistent with the variation of the wind resistance coefficient Kp.
Further, the mode of adjusting the rotation speed n of the fan through the wind resistance coefficient Kp is as follows: a flow sensor is arranged at an air outlet of the fan; controlling the fan to operate at a preset rotating speed and a constant speed so as to enable an air outlet of the fan to output air at a constant air output; replacing filter screens with different meshes, wherein the filter screens with different meshes correspond to different wind resistance coefficients Kp so as to detect the air outlet amount value of the fan at different wind resistance coefficients Kp through a flow sensor; and controlling the fan to decelerate or accelerate according to the magnitude relation between the air outlet quantity value and the constant air outlet quantity of the fan at different wind resistance coefficients Kp until the air outlet quantity value of the fan reaches the constant air outlet quantity, and recording the rotating speed n of the fan at the moment to obtain the rotating speed n of the fan corresponding to the different wind resistance coefficients Kp.
Further, the method for adjusting the rotation speed n of the fan through the wind resistance coefficient variation Δ Kp includes: a flow sensor is arranged at an air outlet of the fan; controlling the fan to operate at a preset rotating speed and a constant speed so as to enable an air outlet of the fan to output air at a constant air output; replacing filter screens with different meshes, wherein the mesh difference between the filter screens with different meshes corresponds to different wind resistance coefficient variable quantities delta Kp so as to detect the air outlet quantity value of the fan when the filter screens with different meshes are replaced by a flow sensor; the method comprises the steps of controlling the fan to decelerate or accelerate according to the size relation between the air outlet quantity value and the constant air outlet quantity of the fan when the fan is used for filtering nets with different meshes until the air outlet quantity value of the fan reaches the constant air outlet quantity, recording the rotating speed n of the fan at the moment, obtaining the rotating speed variation delta n of the fan through the rotating speed n and the preset rotating speed, and further obtaining the rotating speed variation delta n corresponding to different wind resistance coefficient variations delta Kp.
Further, the method for adjusting the rotation speed n of the fan through the wind resistance coefficient variation Δ Kp further includes: when the wind resistance coefficient variation delta Kp is larger than zero, the adjusted rotating speed n of the fan is the sum of the initial rotating speed of the fan and the rotating speed variation delta n corresponding to the wind resistance coefficient variation delta Kp; when the wind resistance coefficient variation delta Kp is smaller than zero, the adjusted rotating speed n of the fan is the difference between the initial rotating speed of the fan and the rotating speed variation delta n corresponding to the wind resistance coefficient variation delta Kp.
Further, the method for controlling the fan to decelerate or accelerate comprises the following steps: when the air output value of the fan is smaller than the constant air output, controlling the fan to operate in an accelerated manner; and when the air outlet value of the fan is larger than the constant air outlet value, controlling the fan to operate in a speed reduction mode.
Further, the air conditioning system constant air volume control method further comprises the following steps: a flow sensor is arranged at an air outlet of the fan; after the rotating speed n of the fan is adjusted through the wind resistance coefficient Kp or the wind resistance coefficient variable quantity delta Kp, the flow sensor detects the air output at the air outlet so as to control the fan to accelerate or decelerate or maintain the real-time rotating speed to operate according to the detection value.
Further, the method for detecting the air output at the air outlet by the flow sensor comprises the following steps: when the flow sensor detects that the air output blown out from the air outlet is consistent with the preset air output Q, the fan is controlled to maintain the real-time rotating speed operation.
Further, the method for detecting the air output at the air outlet by the flow sensor comprises the following steps: when the flow sensor detects that the air output blown out from the air outlet is smaller than a preset air output Q, the fan is controlled to accelerate.
Further, the method for detecting the air output at the air outlet by the flow sensor comprises the following steps: and when the flow sensor detects that the air output blown out from the air outlet is greater than the preset air output Q, controlling the fan to decelerate.
Further, the method for controlling the accelerated running of the fan comprises the following steps: and controlling the fan to accelerate at the maximum rotating speed.
Further, the method for controlling the deceleration operation of the fan comprises the following steps: and controlling the fan to decelerate at the maximum rotating speed.
By applying the technical scheme of the invention, a user firstly sets the fan of the air conditioning system to operate at a preset rotating speed, so that the fan blows out wind with a preset air output. And then, detecting the operation parameters of a fan of the air conditioning system, and acquiring the power P of the fan according to the operation parameters. And then, obtaining a wind resistance coefficient Kp according to the power P, and adjusting the rotating speed n of the fan through the wind resistance coefficient Kp, or obtaining the wind resistance coefficient variation delta Kp of the wind resistance coefficient Kp in a preset time according to the power variation delta P of the power P in the preset time, and adjusting the rotating speed n of the fan through the wind resistance coefficient variation delta Kp. Therefore, in the operation process of the air conditioning system, the operation parameters of the fan are monitored in real time to obtain the power P or the power variation delta P of the fan, and then the wind resistance coefficient Kp is obtained through the power P, or the wind resistance coefficient variation delta Kp is obtained through the power variation delta P. If the wind resistance coefficient Kp changes or the wind resistance coefficient variation delta Kp is not zero, the rotating speed n of the fan needs to be adjusted to ensure that the air volume blown out of the fan is always the preset air volume Q, so that the problem that the air volume of the air conditioning system is reduced due to the fact that the filter screen is dirty and blocked in the prior art is solved, the user experience is improved, and the working efficiency of the air conditioning system is also improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a flow chart of a first embodiment of a constant air volume control method of an air conditioning system according to the present invention; and
fig. 2 shows a flowchart of a second embodiment of the constant air volume control method of the air conditioning system according to the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless stated to the contrary, use of the directional terms "upper and lower" are generally directed to the orientation shown in the drawings, or to the vertical, or gravitational direction; likewise, for ease of understanding and description, "left and right" are generally to the left and right as shown in the drawings; "inner and outer" refer to the inner and outer relative to the profile of the respective member itself, but the above directional terms are not intended to limit the present invention.
In order to solve the problem that the air output of the air conditioning system is reduced due to the fact that filth blockage occurs to the filter screen in the prior art, the application provides a constant air volume control method of the air conditioning system.
Example one
As shown in fig. 1, the constant air volume control method of the air conditioning system is suitable for the air conditioning system with a filter screen arranged at an air outlet, and comprises the following steps:
detecting operating parameters of a fan of an air conditioning system;
acquiring the power P of the fan according to the operation parameters;
and obtaining a wind resistance coefficient Kp according to the power P, and adjusting the rotating speed n of the fan through the wind resistance coefficient Kp so as to enable the air quantity blown out of the fan to be the preset air quantity Q all the time. Wherein the operating parameters include current values and voltage values.
By applying the technical scheme of the embodiment, a user firstly sets the fan of the air conditioning system to operate at a preset rotating speed, so that the fan blows out wind with a preset air output. And then, detecting the operation parameters of a fan of the air conditioning system, and acquiring the power P of the fan according to the operation parameters. And then, obtaining a wind resistance coefficient Kp according to the power P, and adjusting the rotating speed n of the fan through the wind resistance coefficient Kp. Therefore, in the operation process of the air conditioning system, the operation parameters of the fan are monitored in real time to obtain the power P of the fan, and then the wind resistance coefficient Kp is obtained through the power P. If the air resistance coefficient Kp changes, the rotating speed n of the fan needs to be adjusted to ensure that the air volume blown out from the fan is always the preset air volume Q, so that the problem that the air volume of the air conditioning system is reduced due to the fact that the filter screen is dirty and blocked in the prior art is solved, the user use experience is improved, and the working efficiency of the air conditioning system is also increased.
In this embodiment, the air conditioning system includes the new trend device, and the air output of the fan of air conditioning system can be controlled to the constant air volume control method promptly, also can control the air output of the new trend fan of new trend device to ensure that the air output of the fan of air conditioning system and new trend fan is invariable all the time, avoid taking place filthy stifled filter screen and influence the normal air-out or the air output of air conditioning system.
In this embodiment, the rotation speed of the fan is adjusted by the wind resistance coefficient Kp to achieve the constant air output by adjusting the rotation speed, instead of adjusting the air output by detecting the air output at the air outlet by the flow sensor.
In this embodiment, the manner of obtaining the wind resistance coefficient Kp according to the power P is as follows: using the formula n3Obtained as P × Kp. The rotating speed n is constant, and the variation of the power P is consistent with the variation of the wind resistance coefficient Kp. Specifically, when dust or impurities on the filter screen accumulate to a certain degree during the operation of the fan at a preset rotating speed, the wind resistance coefficient Kp of the fan is increased, and the power P of the fan is reduced. Because the rotating speed n is constant, the power P can be detected, the increased wind resistance coefficient Kp can be obtained through the formula, and the rotating speed n of the fan is adjusted according to the increased wind resistance coefficient Kp, so that the air volume blown out of the fan is always the preset air volume Q, and the constant air volume operation is further realized.
In this embodiment, the manner of adjusting the rotation speed n of the fan by the wind resistance coefficient Kp is as follows:
a flow sensor is arranged at an air outlet of the fan;
controlling the fan to operate at a preset rotating speed and a constant speed so as to enable an air outlet of the fan to output air at a constant air output;
replacing filter screens with different meshes, wherein the filter screens with different meshes correspond to different wind resistance coefficients Kp so as to detect the air outlet amount value of the fan at different wind resistance coefficients Kp through a flow sensor;
and controlling the fan to decelerate or accelerate according to the magnitude relation between the air outlet quantity value and the constant air outlet quantity of the fan at different wind resistance coefficients Kp until the air outlet quantity value of the fan reaches the constant air outlet quantity, and recording the rotating speed n of the fan at the moment to obtain the rotating speed n of the fan corresponding to the different wind resistance coefficients Kp.
Specifically, in the debugging stage of the air conditioning system, the corresponding rotating speed n at different wind resistance coefficients Kp is recorded and stored, and the data is subjected to curve fitting through a computer, so that the corresponding relation between the wind resistance coefficients Kp and the rotating speed n is obtained. Therefore, the user can obtain the rotating speed n by looking up the table or calculating as long as the user can obtain the wind resistance coefficient Kp. And then, the user controls the rotating speed of the fan to reach the corresponding rotating speed, so that the constant air volume can be realized.
In this embodiment, the method for controlling the fan to decelerate or accelerate includes: when the air output value of the fan is smaller than the constant air output, controlling the fan to operate in an accelerated manner; and when the air outlet value of the fan is larger than the constant air outlet value, controlling the fan to operate in a speed reduction mode.
Specifically, when the air output value of the fan is smaller than the constant air output, the fan is controlled to operate at an accelerated speed so as to increase the air output of the fan until the air output value is consistent with the constant air output, the rotating speed of the fan at the moment is obtained, and the rotating speed n required by the fan for ensuring the constant air output when the wind resistance coefficient Kp is obtained.
Specifically, when the air output value of the fan is greater than the constant air output, the fan is controlled to operate in a speed reducing mode to reduce the air output of the fan until the air output value is consistent with the constant air output, the rotating speed of the fan at the moment is obtained, and the rotating speed n required by the fan for ensuring the constant air output when the wind resistance coefficient Kp is obtained.
In this embodiment, the method for controlling the constant air volume of the air conditioning system further includes:
a flow sensor is arranged at an air outlet of the fan;
after the rotating speed n of the fan is adjusted through the wind resistance coefficient Kp, the flow sensor detects the air output at the air outlet so as to control the fan to accelerate or decelerate or maintain the real-time rotating speed operation of the fan according to the detection value.
Specifically, after the rotating speed n of the fan is adjusted through the wind resistance coefficient Kp, the air quantity at the air outlet is detected by the flow sensor, so that the air quantity is secondarily checked through the flow sensor, the air quantity is further guaranteed to be constant, and the constant air quantity reliability of the air conditioning system is further improved.
In this embodiment, the method for detecting the air output at the air outlet by the flow sensor includes: when the flow sensor detects that the air output blown out from the air outlet is consistent with the preset air output Q, the fan is controlled to maintain the real-time rotating speed operation. Specifically, the air output at the air outlet is secondarily detected through the flow sensor, so that the air output is further ensured to be constant. When the air output reaches the preset air output Q, the fan is controlled to operate at the real-time rotating speed, and the air output requirement can be met without adjusting the rotating speed of the fan.
In this embodiment, the method for detecting the air output at the air outlet by the flow sensor includes: when the flow sensor detects that the air output blown out from the air outlet is smaller than a preset air output Q, the fan is controlled to accelerate. Specifically, the air output at the air outlet is secondarily detected through the flow sensor, so that the air output is further ensured to be constant. When the air output is less than the preset air output Q, the fan is controlled to accelerate until the air output reaches the preset air output Q, and then the constant air output operation is realized.
In this embodiment, the method for detecting the air output at the air outlet by the flow sensor includes: and when the flow sensor detects that the air output blown out from the air outlet is greater than the preset air output Q, controlling the fan to decelerate. Specifically, the air output at the air outlet is secondarily detected through the flow sensor, so that the air output is further ensured to be constant. When the air output is greater than the preset air output Q, the fan is controlled to decelerate until the air output reaches the preset air output Q, and then the constant air output operation is realized.
In this embodiment, the method for controlling the accelerated operation of the fan includes: and controlling the fan to accelerate at the maximum rotating speed. Like this, above-mentioned setting has realized the quick adjustment of fan rotational speed, shortens the adjustment consuming time to guarantee that air conditioning system's air outlet department is invariable air output all the time.
In this embodiment, the method for controlling the deceleration operation of the fan includes: and controlling the fan to decelerate at the maximum rotating speed. Like this, above-mentioned setting has realized the quick adjustment of fan rotational speed, shortens the adjustment consuming time to guarantee that air conditioning system's air outlet department is invariable air output all the time.
Example two
The difference between the constant air volume control method of the air conditioning system in the second embodiment and the first embodiment is that: the manner of adjusting the rotation speed n of the fan is different.
As shown in fig. 2, the wind resistance coefficient variation Δ Kp of the wind resistance coefficient Kp in the preset time is obtained according to the power variation Δ P of the power P in the preset time, so as to adjust the rotation speed n of the fan according to the wind resistance coefficient variation Δ Kp. Specifically, a user firstly sets a fan of the air conditioning system to operate at a preset rotating speed, so that the fan blows out wind with a preset air output. And then, detecting the operation parameters of a fan of the air conditioning system, and acquiring the power P of the fan according to the operation parameters. And then, obtaining the wind resistance coefficient variation delta Kp of the wind resistance coefficient Kp in the preset time according to the power variation delta P of the power P in the preset time, so as to adjust the rotating speed n of the fan according to the wind resistance coefficient variation delta Kp. Therefore, in the operation process of the air conditioning system, the operation parameters of the fan are monitored in real time to obtain the power variation delta P of the fan, and then the wind resistance coefficient variation delta Kp is obtained through the power variation delta P. If the variable quantity delta Kp of the wind resistance coefficient is not zero, the rotating speed n of the fan needs to be adjusted to ensure that the air quantity blown out of the fan is always the preset air quantity Q, so that the problem that the air quantity of the air conditioning system is reduced due to the fact that the filter screen is dirty and blocked in the prior art is solved, the user use experience is improved, and the working efficiency of the air conditioning system is also increased.
In this embodiment, the manner of obtaining the wind resistance coefficient variation Δ Kp of the wind resistance coefficient Kp within the preset time according to the power variation Δ P of the power P within the preset time is as follows: using the formula n3Obtained as P × Kp. The rotating speed n is constant, and the variation of the power P is consistent with the variation of the wind resistance coefficient Kp. Specifically, in the process that the fan runs at a preset rotating speed, when dust or impurities on the filter screen are accumulated to a certain degree, the wind resistance coefficient Kp of the fan is increased, the wind resistance coefficient variation delta Kp is larger than zero, the power P of the fan is reduced, and the power variation delta P is smaller than zero. Because the rotating speed n is constant, the power variation delta P can be calculated, the wind resistance coefficient variation delta Kp can be obtained through the formula, and the rotating speed variation delta n of the fan is adjusted according to the wind resistance coefficient variation delta Kp, so that the air volume blown out of the fan is always the preset air volume Q, and the constant air volume operation is further realized.
In this embodiment, the method for adjusting the rotation speed n of the fan by the wind resistance coefficient variation Δ Kp further includes:
when the wind resistance coefficient variation delta Kp is larger than zero, the adjusted rotating speed n of the fan is the sum of the initial rotating speed of the fan and the rotating speed variation delta n corresponding to the wind resistance coefficient variation delta Kp;
when the wind resistance coefficient variation delta Kp is smaller than zero, the adjusted rotating speed n of the fan is the difference between the initial rotating speed of the fan and the rotating speed variation delta n corresponding to the wind resistance coefficient variation delta Kp.
Specifically, when the wind resistance coefficient variation Δ Kp is greater than zero, the wind resistance coefficient Kp increases, and the rotation speed of the fan needs to be increased. When the wind resistance coefficient variation delta Kp is smaller than zero, the wind resistance coefficient Kp is reduced, and the rotating speed of the fan needs to be reduced.
In this embodiment, the method for controlling the constant air volume of the air conditioning system further includes:
a flow sensor is arranged at an air outlet of the fan;
after the rotating speed n of the fan is adjusted through the wind resistance coefficient variable quantity delta Kp, the flow sensor detects the air quantity at the air outlet so as to control the fan to accelerate or decelerate or maintain the real-time rotating speed operation of the fan according to the detection value.
Specifically, after the rotating speed n of the fan is adjusted through the wind resistance coefficient variable quantity delta Kp, the air quantity at the air outlet is detected by the flow sensor, so that the air quantity is secondarily checked through the flow sensor, the air quantity is further guaranteed to be constant, and the constant air quantity reliability of the air conditioning system is further improved.
In this embodiment, the adjusting the rotation speed n of the fan by the wind resistance coefficient variation Δ Kp includes:
a flow sensor is arranged at an air outlet of the fan;
controlling the fan to operate at a preset rotating speed and a constant speed so as to enable an air outlet of the fan to output air at a constant air output;
replacing filter screens with different meshes, wherein the mesh difference between the filter screens with different meshes corresponds to different wind resistance coefficient variable quantities delta Kp so as to detect the air outlet quantity value of the fan when the filter screens with different meshes are replaced by a flow sensor;
the method comprises the steps of controlling the fan to decelerate or accelerate according to the size relation between the air outlet quantity value and the constant air outlet quantity of the fan when the fan is used for filtering nets with different meshes until the air outlet quantity value of the fan reaches the constant air outlet quantity, recording the rotating speed n of the fan at the moment, obtaining the rotating speed variation delta n of the fan through the rotating speed n and the preset rotating speed, and further obtaining the rotating speed variation delta n corresponding to different wind resistance coefficient variations delta Kp.
Specifically, in the debugging stage of the air conditioning system, the corresponding rotation speed variation Δ n at different windage coefficient variations Δ Kp is recorded and stored, and the data is subjected to curve fitting by a computer, so as to obtain the corresponding relationship between the windage coefficient variation Δ Kp and the rotation speed variation Δ n. Therefore, the user can obtain the rotating speed variation delta n by looking up the table or calculating as long as the wind resistance coefficient variation delta Kp can be obtained, and the rotating speed after the fan is adjusted can be obtained by adding or subtracting the preset rotating speed and the rotating speed variation delta n. And then, the user controls the rotating speed of the fan to reach the corresponding rotating speed, so that the constant air volume can be realized.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
a user firstly sets a fan of the air conditioning system to operate at a preset rotating speed, so that the fan blows out wind with a preset air outlet quantity. And then, detecting the operation parameters of a fan of the air conditioning system, and acquiring the power P of the fan according to the operation parameters. And then, obtaining a wind resistance coefficient Kp according to the power P, and adjusting the rotating speed n of the fan through the wind resistance coefficient Kp, or obtaining the wind resistance coefficient variation delta Kp of the wind resistance coefficient Kp in a preset time according to the power variation delta P of the power P in the preset time, and adjusting the rotating speed n of the fan through the wind resistance coefficient variation delta Kp. Therefore, in the operation process of the air conditioning system, the operation parameters of the fan are monitored in real time to obtain the power P or the power variation delta P of the fan, and then the wind resistance coefficient Kp is obtained through the power P, or the wind resistance coefficient variation delta Kp is obtained through the power variation delta P. If the wind resistance coefficient Kp changes or the wind resistance coefficient variation delta Kp is not zero, the rotating speed n of the fan needs to be adjusted to ensure that the air volume blown out of the fan is always the preset air volume Q, so that the problem that the air volume of the air conditioning system is reduced due to the fact that the filter screen is dirty and blocked in the prior art is solved, the user experience is improved, and the working efficiency of the air conditioning system is also improved.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. The constant air volume control method of the air conditioning system is suitable for the air conditioning system with a filter screen arranged at an air outlet, and is characterized by comprising the following steps:
detecting an operating parameter of a fan of the air conditioning system;
acquiring the power P of the fan according to the operation parameters;
obtaining a wind resistance coefficient Kp according to the power P, adjusting the rotating speed n of the fan through the wind resistance coefficient Kp, or obtaining a wind resistance coefficient variation delta Kp of the wind resistance coefficient Kp within a preset time according to the power variation delta P of the power P within the preset time, and adjusting the rotating speed n of the fan through the wind resistance coefficient variation delta Kp, so that the air volume blown out of the fan is always a preset air output Q; wherein the operating parameter comprises a current value and/or a voltage value.
2. The method for controlling the constant air volume of the air conditioning system according to claim 1, wherein the method for obtaining the wind resistance coefficient Kp according to the power P, or obtaining the wind resistance coefficient change Δ Kp of the wind resistance coefficient Kp in a preset time according to the power change Δ P of the power P in the preset time is as follows:
using the formula n3P × Kp; the rotating speed n is constant, and the variation of the power P is consistent with the variation of the wind resistance coefficient Kp.
3. The method for controlling the constant air volume of the air conditioning system according to claim 1, wherein the manner of adjusting the rotation speed n of the fan by the wind resistance coefficient Kp is as follows:
a flow sensor is arranged at an air outlet of the fan;
controlling the fan to operate at a preset rotating speed and a constant speed so as to enable an air outlet of the fan to output air at a constant air output;
replacing filter screens with different meshes, wherein the filter screens with different meshes correspond to different wind resistance coefficients Kp so as to detect the air outlet value of the fan at different wind resistance coefficients Kp through the flow sensor;
and controlling the fan to decelerate or accelerate according to the magnitude relation between the air outlet quantity value of the fan at different wind resistance coefficients Kp and the constant air outlet quantity until the air outlet quantity value of the fan reaches the constant air outlet quantity, and recording the rotating speed n of the fan at the moment so as to obtain the rotating speed n of the fan corresponding to the different wind resistance coefficients Kp.
4. The method for controlling the constant air volume of the air conditioning system according to claim 1, wherein the adjusting the rotation speed n of the fan by the wind resistance coefficient variation Δ Kp comprises:
a flow sensor is arranged at an air outlet of the fan;
controlling the fan to operate at a preset rotating speed and a constant speed so as to enable an air outlet of the fan to output air at a constant air output;
replacing filter screens with different meshes, wherein the mesh difference between the filter screens with different meshes corresponds to different wind resistance coefficient variable quantities delta Kp, so as to detect the air outlet quantity value of the fan when the filter screens with different meshes are replaced through the flow sensor;
the method comprises the steps of controlling the fan to decelerate or accelerate according to the air outlet quantity value of the fan when the filter screens with different meshes are used and the size relation between the constant air outlet quantities until the air outlet quantity value of the fan reaches the constant air outlet quantity, recording the rotating speed n of the fan at the moment, and obtaining the rotating speed variation delta n of the fan through the rotating speed n and the preset rotating speed so as to obtain the rotating speed variation delta n corresponding to different wind resistance coefficient variations delta Kp.
5. The method for controlling the constant air volume of the air conditioning system according to claim 4, wherein the adjusting the rotation speed n of the fan by the wind resistance coefficient variation Δ Kp further comprises:
when the wind resistance coefficient variation delta Kp is larger than zero, the adjusted rotating speed n of the fan is the sum of the initial rotating speed of the fan and the rotating speed variation delta n corresponding to the wind resistance coefficient variation delta Kp;
and when the wind resistance coefficient variation delta Kp is smaller than zero, the adjusted rotating speed n of the fan is the difference between the initial rotating speed of the fan and the rotating speed variation delta n corresponding to the wind resistance coefficient variation delta Kp.
6. The constant air volume control method of the air conditioning system according to claim 3 or 4, wherein the method for controlling the fan to decelerate or accelerate comprises the following steps:
when the air outlet value of the fan is smaller than the constant air outlet quantity, controlling the fan to operate in an accelerated manner;
and when the air outlet quantity value of the fan is larger than the constant air outlet quantity, controlling the fan to operate in a speed reduction mode.
7. The air conditioning system constant air volume control method according to claim 1, further comprising:
a flow sensor is arranged at an air outlet of the fan;
after the rotating speed n of the fan is adjusted through the wind resistance coefficient Kp or the wind resistance coefficient variable quantity delta Kp, the flow sensor detects the air output at the air outlet, so that the fan is controlled to accelerate or decelerate or maintain the real-time rotating speed to operate according to the detection value.
8. The constant air volume control method of the air conditioning system according to claim 7, wherein the method for detecting the air volume at the air outlet by the flow sensor comprises the following steps:
and when the flow sensor detects that the air output blown out from the air outlet is consistent with a preset air output Q, controlling the fan to maintain the real-time rotating speed operation.
9. The constant air volume control method of the air conditioning system according to claim 7, wherein the method for detecting the air volume at the air outlet by the flow sensor comprises the following steps:
and when the flow sensor detects that the air output blown out from the air outlet is less than the preset air output Q, controlling the fan to accelerate.
10. The constant air volume control method of the air conditioning system according to claim 7, wherein the method for detecting the air volume at the air outlet by the flow sensor comprises the following steps:
and when the flow sensor detects that the air output blown out from the air outlet is greater than the preset air output Q, controlling the fan to decelerate.
11. The method for controlling the constant air volume of the air conditioning system according to claim 7, wherein the method for controlling the accelerated operation of the fan comprises the following steps:
and controlling the fan to accelerate at the maximum rotating speed.
12. The method for controlling the constant air volume of the air conditioning system according to claim 7, wherein the method for controlling the fan to run at a reduced speed comprises the following steps:
and controlling the fan to decelerate at the maximum rotating speed.
CN201911230137.5A 2019-12-04 2019-12-04 Constant air volume control method for air conditioning system Pending CN111059736A (en)

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CN114877504A (en) * 2022-07-01 2022-08-09 北京环都拓普空调有限公司 Self-adaptive constant air volume fresh air control method and system
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Application publication date: 20200424