CN114877504A - Self-adaptive constant air volume fresh air control method and system - Google Patents
Self-adaptive constant air volume fresh air control method and system Download PDFInfo
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- 239000000126 substance Substances 0.000 claims description 2
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- 208000034804 Product quality issues Diseases 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
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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
- F24F11/62—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
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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
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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
- F24F11/77—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
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- 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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Abstract
The invention discloses a self-adaptive constant air volume fresh air control method and a self-adaptive constant air volume fresh air control system. The method comprises the following steps: s1: changing the power of a motor and detecting the rotating speed of a fan to obtain a rotating speed value corresponding to the power; s2: obtaining the resistance of the system corresponding to the rotating speed value based on the preset rotating speed-system resistance relation; s3: obtaining the required power of the motor required for reaching the preset air volume based on the preset air volume-resistance-power relation according to the resistance of the system; s4: and adjusting the actual power of the fan operation according to the required power obtained in the step S3, and keeping the fan operating at the required power. The invention keeps the expected air volume by self-adaptively adjusting the rotating speed of the fan, thereby being more energy-saving and environment-friendly; and the rotating speed can be adaptively adjusted according to the working condition change by only utilizing the self-carried tachometer of the fan so as to keep the expected air quantity, thereby reducing the implementation cost.
Description
Technical Field
The invention relates to a self-adaptive constant air volume fresh air control method and a self-adaptive constant air volume fresh air system, belonging to the technical field of air conditioning.
Background
Generally, the performance parameter settings of the fresh air fans when leaving the factory are consistent, and different performance parameters cannot be configured for the working condition of each installation position. However, because the new fan installation conditions of each user are different, and the service environment and the use habits (different filter screen replacement or cleaning frequency) are different greatly, the same new fan is caused to present different experience effects when used by different users, and most importantly, the difference between the theoretical air supply volume and the actual air supply volume is large. This problem becomes even one of the important causes of product complaints.
In order to solve the problems, a plurality of new fan manufacturers develop a constant air volume product, namely, the product can ensure that the theoretical air volume and the actual air volume are consistent under any installation condition, any use environment and any use habit. For example, in chinese utility model No. 201320053770.3, a constant air volume fresh air system is disclosed. The system is characterized in that an air quantity detector is arranged on a ventilation channel on one side of an indoor air outlet, the air speed of an air supply outlet is detected, and then the air speed of the air supply outlet is kept constant at a set value by controlling the rotating speed of a fan, so that the effect of keeping the air quantity constant is achieved. For another example, in chinese patent application No. 201910410496.2, a method for controlling constant air volume of a fresh air system is disclosed. The method adjusts the duty ratio by detecting the current of the motor, realizes the constancy of the power of the motor by closed-loop control of the current, realizes the constancy of the air quantity of the fan by keeping the constant of the power of the motor, avoids overlarge or undersize air quantity in a user home, and realizes the relative stability of the air quantity.
However, the various technical schemes either need to use an expensive fan with a special structure or need additional detection instruments or elements, so that the cost of the electric control unit is high, the cost of the product matching service is increased, and the product competition is not facilitated; and energy consumption waste is possibly caused, and the environment is not favorable.
Disclosure of Invention
The invention aims to provide a self-adaptive constant air volume fresh air control method.
The invention aims to solve another technical problem of providing a self-adaptive constant air volume fresh air system.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to a first aspect of the embodiments of the present invention, there is provided an adaptive constant air volume fresh air control method, including the following steps:
s1: changing the power of a motor and detecting the rotating speed of a fan to obtain a rotating speed value corresponding to the power;
s2: obtaining the resistance of the system corresponding to the rotating speed value based on a preset rotating speed-system resistance relation;
s3: obtaining the required power of the motor required for reaching the preset air volume based on a preset air volume-resistance-power relation according to the resistance of the system;
s4: and adjusting the actual power of the fan operation according to the required power obtained in the step S3, and keeping the fan operating at the required power.
Preferably, in the step S1, the control unit controls the motor to work at a rated power or at a predetermined power to obtain a real-time rotation speed of the fan;
within a preset time length, after gradually changing the power of the motor, carrying out multiple detections to respectively obtain real-time rotating speeds corresponding to each power;
and taking the average value of the real-time rotating speeds under the same power as a rotating speed value corresponding to the power.
Preferably, in the step S2, the resistance relation between the rotation speed and the system is: a graph with the rotating speed and the resistance value of the system as coordinate axes, or a table with the rotating speed and the resistance value of the system as horizontal lines or columns; wherein, the fresh air blowers of different models have different rotating speed-system resistance relations.
Preferably, the relationship between the rotating speed and the resistance of the system is obtained by the following steps:
starting a motor to work at a rated power or a maximum gear, and enabling a new fan to be tested to reach a preset air volume by monitoring the air volume after the motor is stable;
then, changing the resistance value of the system to sequentially increase the resistance value of the air path where the fresh air fan is located in the laboratory;
and under the resistance value of each system, measuring the corresponding fan rotating speed under the resistance value of the corresponding system by using a tachometer.
Preferably, the current air volume is set as a first air volume and is kept unchanged, and the corresponding motor input power under each resistance value is measured by continuously changing the resistance value of the system to form a curve of the first air volume;
setting the current air volume as a second air volume and keeping the current air volume unchanged, and measuring the corresponding input power of the motor under each resistance value by continuously changing the resistance value of the system to form a curve of the second air volume;
obtaining curves of all air volumes in a similar mode, wherein each curve of the air volume comprises a corresponding relation between a resistance value and power of a system;
and forming an air volume-resistance-power curve graph according to the curves of the air volumes.
Preferably, the relationship between the rotating speed and the resistance of the system and the relationship between the air volume and the resistance and the power are respectively obtained by the following steps:
firstly, enabling the motor to work at a rated power, monitoring the air quantity through an anemometer, and reading the current resistance through a pressure gauge; reading the current rotating speed by using a tachometer; gradually reducing the power, and measuring the air volume, the resistance and the rotating speed corresponding to each power; finally, obtaining the resistance relation of the rotating speed-system according to the resistance and the rotating speed under each power; and obtaining the air volume-resistance-power relation according to the resistance and the air volume under each power.
Preferably, the relationship between the rotating speed and the resistance of the system is obtained by the following steps: firstly, enabling a motor to work at rated power, and reading the current resistance by using a pressure gauge; reading the current rotating speed by using a tachometer; then, gradually reducing the power, and measuring the resistance and the rotating speed corresponding to each power to obtain the resistance relation of the rotating speed-system
The air volume-resistance-power relation is obtained by the following method: firstly, enabling a motor to work at a rated power, monitoring air quantity through an anemometer, and reading current resistance through a pressure gauge; then, the power is gradually reduced, and the air volume and the resistance corresponding to each power are measured to obtain the relationship of the air volume, the resistance and the power.
Preferably, the following steps are further included after step S4:
s14: judging whether the difference value between the current power and the required power is in an allowable range, if so, keeping the current state to operate, and entering the step 16; if not, go to step S15;
s15: controlling the rotating speed of the fan according to the required power, adjusting the state of the equipment, reading the rotating speed of the current fan, calculating the corresponding current power, and returning to the step S14;
s16: keeping the current state running, starting timing, and waiting for the next detection period to arrive to execute step S1.
Preferably, the following steps are further included after step S16:
s17: judging whether a new expected air volume is received in real time, and if so, continuously executing the step; if there is a change, go to step S18;
s18: judging whether the resistance of the system needs to be detected again, and returning to the step S11 if the resistance of the system needs to be detected again; if not, return to step S3.
According to a second aspect of the embodiments of the present invention, there is provided an adaptive constant air volume fresh air system, including a control unit, a motor, a fan, a heat exchanger, and a tachometer installed on the fan; wherein the content of the first and second substances,
the control unit controls the power of the motor by using the self-adaptive constant air volume fresh air control method, so that the rotating speed of the fan is continuously adjusted by changing the power of the motor in a self-adaptive manner.
Compared with the prior art, the self-adaptive constant air volume fresh air control method and the system provided by the invention can maintain the expected air volume by self-adaptively adjusting the rotating speed of the fan, thereby being more energy-saving and environment-friendly; and the rotating speed can be adaptively adjusted according to the working condition change by only utilizing the tachometer of the fan, so as to keep the expected air volume, the implementation cost is reduced, and the problems of high manufacturing cost and easy damage of an electric control unit in the existing fresh air system are fundamentally solved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a self-adaptive constant air volume fresh air system provided by the present invention;
FIG. 2 is a diagram illustrating the relationship between the rotational speed and the resistance of the system according to the first embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a flow of detecting the resistance of the system according to the first embodiment of the present invention;
FIG. 4 is a diagram showing the relationship between air volume, resistance and power in the first embodiment of the present invention;
FIG. 5 is a flowchart illustrating an overall adaptive constant-airflow method according to a third embodiment of the present invention;
FIG. 6 is a flowchart illustrating an overall adaptive constant-air-volume fresh air method according to a fourth embodiment of the present invention.
Detailed Description
The technical contents of the invention are described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the adaptive constant air volume fresh air system (referred to as a fresh air system for short) provided by the present invention includes a control unit 10, a motor 20, a fan 30, a heat exchanger 50, and a tachometer 40 installed on the fan 30. The control unit 10 controls the power of the motor 20 to adjust the rotation speed of the blower 30 to a proper speed by adaptively changing the power of the motor 20, thereby ensuring that the air volume passing through the heat exchanger 50 is a desired air volume. The fresh air system utilizes a heat exchanger 50 for heat exchange. The fan 30 is started to form negative pressure in the room, and outdoor fresh air enters the fan 30, passes through the heat exchanger 50 and then enters the room. In the other air passage, the fan 30 generates a negative pressure outdoors to discharge dirty air indoors. In the working process of the fresh air system, the rotating speed of the fan 30 is automatically adjusted according to the length of a system pipe network and the resistance, and constant air volume output is ensured. When the resistance of a system pipe network is large, the rotating speed is automatically increased, and the air quantity is ensured not to be influenced; when the resistance of a system pipe network is small, the rotating speed is automatically reduced, and on the premise of meeting the constant air, the power consumption and the noise are reduced, so that the air quantity is constant, the phenomenon of overlarge or undersize is avoided, and the air conditioner is comfortable and energy-saving.
The working principle of the adaptive constant air volume fresh air system is further described below with reference to different embodiments of the adaptive constant air volume fresh air control method provided by the present invention.
< first embodiment >
In a first embodiment of the present invention, the adaptive constant air volume fresh air control method includes the following steps:
S1A: the motor runs at rated power and detects the rotating speed of the fan to obtain a rotating speed value.
In various cases where it is necessary to confirm the resistance of the system again, such as after the installation of the fresh air system or after the re-adjustment, the control unit 10 controls the motor 20 to operate at the rated power or at the predetermined power. After the motor 20 operates at the rated power (or the maximum gear) for a preset time (e.g., 1 minute or 30 seconds), the real-time rotation speed of the fan 30 is obtained by using a rotation speed detection unit 40 (e.g., a sensor) located at the fan 30. And detecting the real-time rotating speed for multiple times within a preset duration, and calculating a sliding average value of the multiple real-time rotating speeds as a rotating speed value corresponding to the rated power. Or, calculating whether the difference value of the real-time rotating speeds of the adjacent 3 times reaches a preset error range, if so, determining that the rotating speed is stable, and taking the arithmetic mean value as the rotating speed value corresponding to the rated power.
S2A: and obtaining the resistance of the system corresponding to the rotating speed value based on a preset rotating speed-system resistance relation.
Here, the relationship between the rotational speed and the system resistance is a graph having the rotational speed and the system resistance as coordinate axes shown in fig. 2, or a table having the rotational speed and the system resistance as horizontal lines. That is, the relationship between the rotational speed and the resistance of the system is a one-to-one correspondence relationship between the rotational speed and the resistance of the system, and may be a discrete value or a continuous value. In the present embodiment, the relationship between the rotational speed and the resistance of the system shown in fig. 2 is merely used as an example for description.
However, different models of fresh air systems have different speed-system resistance relationships. Therefore, before shipping, the relationship between the rotation speed of the fresh air system of each specification and the resistance of the system (i.e., the rotation speed-resistance curve of the fresh air system of each specification and the resistance of the system shown in fig. 2) needs to be measured in a laboratory. And the tested rotating speed-system resistance relation needs to be written into the chip of the control unit 10 of the fresh air system of the model.
Aiming at a fresh air system of a certain model, a plurality of fresh air systems to be tested need to be randomly extracted to determine the resistance relation between the rotating speed and the system corresponding to the fresh air system of the specification model.
Specifically, referring to fig. 3, during laboratory testing, the electric machine was first started to operate at rated power or maximum gear. After the stabilization is achieved (for example, after 5 minutes), the fresh air system to be tested achieves a preset air volume (such as the maximum air volume specified in the product configuration) by monitoring the air volume. Then, the resistance value of the system is changed (for example, from 0 to 200 Pa) according to the laboratory conditions, so that the resistance value of the air path of the fresh air system in the laboratory is sequentially increased, for example, from 0Pa, gradually increased by one step (for example, 1Pa, 5Pa or 10 Pa) until 200 Pa. And under the resistance value of each system, measuring the corresponding fan rotating speed under the resistance value of the corresponding system by using a tachometer. And finally, forming a corresponding relation between the resistance value of the system and the rotating speed of the fan, and manufacturing a resistance-rotating speed curve or a resistance-rotating speed corresponding table.
The constant air quantity can be stabilized by utilizing an enthalpy difference laboratory (a conventional laboratory arranged in a new air blower manufacturer), and different state points are formed by changing resistance. When the fresh air system product is installed in place or needs to trigger the resistance detection program of the system after maintenance and the like, the system operates with the preset air volume, and then the resistance of the system under the current working condition is judged in a mode of checking a resistance-rotating speed curve or a resistance-rotating speed corresponding table (detailed later).
S3A: and according to the resistance of the system, based on a preset air volume-resistance-power relation, finding out the required power of the motor required by reaching the preset air volume.
As shown in fig. 4, the relationship between air volume, resistance and power is the corresponding relationship between resistance and power at different air volumes. Namely, the relationship of air volume-resistance-power shows the power corresponding to different resistances under different air volumes; and the power corresponding to different air quantities under different resistances can be represented. Therefore, the corresponding value of the air volume and the power is obtained from the air volume-resistance-power relationship table shown in fig. 4 using the resistance of the system obtained in step S2. Assuming that the system resistance under the current condition of the fresh air system is 100Pa and the desired air volume (constant air volume) input by the user is 210CHM as detected in step S2, the corresponding power is 60W as obtained from the table shown in fig. 4. This means that under the current working condition, the fresh air system needs to reach the air volume of 210CHM, and the motor power needs to be set to 60W.
The fresh air systems of different specifications and models have different air volume-resistance-power relationships, so that the fresh air systems need to be tested before leaving the factory and written into the chip of the control unit 10. The test procedure is as follows.
For example, a first 100m year curve is formed by setting the fresh air system to be measured at a first air volume (for example, 100m year) by using an air gauge, keeping the air volume constant, and continuously changing the resistance values (0 Pa, 10Pa, 20Pa, 30Pa, and … … 200 Pa) of the system to measure the corresponding motor input power at each resistance value. Then, a second wind rate (e.g., 210 m/h) is set, and the wind rate is maintained, and the resistance values (0 Pa, 10Pa, 20Pa, 30Pa, … … 200 Pa) of the system are continuously changed to measure the corresponding motor input powers at the respective resistance values, thereby forming a second 210m curve for cultivation/h. Similar to the above procedure, a third, fourth, etc. plurality of curves are measured. Curves of the respective air volumes are obtained in a similar manner, and each curve of the air volume includes a correspondence of a resistance value and a power of the system. Finally, a graph (or table) of air volume-resistance-power is formed as shown in fig. 4.
S4A: and adjusting the actual power of the fan operation according to the required power obtained in the step S3, and keeping the fan operating at the required power.
And adjusting the power of the motor according to the required power obtained in the step S3, so that the fan can reach the expected air volume under the current working condition.
Therefore, the self-adaptive constant air volume fresh air control method provided by the invention realizes the closed-loop feedback control of the fan by utilizing the tachometer of the fan, and does not need additional hardware. Moreover, because different models have different relationship curves shown in fig. 2 and 4, and the relationship curves are written into firmware, one-machine-one control can be realized, and the control accuracy is higher. Furthermore, because the system is self-adaptive and does not need additional hardware outside the fresh air system, after the installation position of the fresh air system or the air duct environment is changed, a user can also adjust the relationship curves shown in fig. 2 and 4 in time by starting a detection program in the firmware, professional services are not needed, the convenience is improved, and the service cost is reduced.
< second embodiment >
The self-adaptive constant air volume fresh air control method provided by the second embodiment of the invention comprises the following steps.
S1B: and detecting the rotating speed of the motor under the current working condition to obtain a rotating speed value.
In various cases where it is necessary to confirm the resistance of the system again, such as after the installation of the fresh air system or after the re-adjustment, the control unit 10 controls the motor 20 to operate at the rated power or at the predetermined power. After the motor 20 is operated at the rated power for a preset time (e.g., 1 minute or 30 seconds), the real-time rotational speed of the fan 30 is obtained using a rotational speed detecting unit 40 (e.g., a sensor) located at the fan 30. And detecting the real-time rotating speed for multiple times within a preset duration, and calculating a sliding average value of the multiple real-time rotating speeds as a rotating speed value corresponding to the rated power. Or, calculating whether the difference value of the real-time rotating speeds of the adjacent 3 times reaches a preset error range, if so, determining that the rotating speed is stable, and taking the arithmetic mean value as the rotating speed value corresponding to the rated power.
S2B: and obtaining the resistance of the system corresponding to the rotating speed value based on a preset rotating speed-system resistance relation.
Here, the relationship between the rotational speed and the system resistance is a graph having the rotational speed and the system resistance as coordinate axes shown in fig. 2, or a table having the rotational speed and the system resistance as horizontal lines. That is, the relationship between the rotational speed and the resistance of the system is a one-to-one correspondence between the rotational speed and the resistance of the system, and may be a discrete value or a continuous value. In the present embodiment, the relationship between the rotational speed and the resistance of the system shown in fig. 2 is merely used as an example for description.
As mentioned above, different types of fresh air systems have different speed-system resistance relationships. Therefore, before shipping, the relationship between the rotation speed of the fresh air system of each specification and the resistance of the system (i.e., the rotation speed-resistance curve of the fresh air system of each specification and the resistance of the system shown in fig. 2) needs to be measured in a laboratory.
When testing in a laboratory, the fresh air system to be tested is connected to the testing system. The test system comprises a pressure gauge for detecting resistance, an anemometer for detecting air quantity and a tachometer for detecting the rotating speed of the fan. Starting a motor, monitoring by an anemometer, and reading the current resistance by using a pressure meter when a first air volume (such as the maximum air volume) is reached; and reading the current rotating speed by using a tachometer. Assuming that the read resistance is Y1 and the rotation speed is X1 at the time of the maximum air volume, point 1 (X1, Y1) is recorded. Next, the motor power is reduced, a second air flow (e.g., 99% of the maximum air flow) is monitored by the anemometer, and at this time, the resistance and the rotation speed are read, and if the resistance is Y2 and the rotation speed is X2, the value is recorded as point 2 (X2, Y2). Then, the motor power is reduced again, and point 3 (X3, Y3) corresponding to the third air volume is measured. Repeating the steps until the minimum air volume is reached, and obtaining points N (XN, YN) corresponding to the air volumes one by one. Finally, point 1, point 2, point 3 … … are pointed to point N. Similarly, a plurality of fresh air systems of the specification and the model are tested one by one, the test results of the plurality of fresh air systems to be tested are obtained at each air volume, and the average value is taken as a point corresponding to the air volume. Thus, point 1, point 2, point 3 … … and point N corresponding to the respective air volumes were obtained, and finally plotted as a curve shown in fig. 2.
As will be appreciated by those skilled in the art, alternatively, during testing, the motor may be operated at a rated power, and the current resistance may be read by the pressure gauge; and reading the current rotating speed by using a tachometer. Then, the power was gradually decreased, and the resistance and the rotation speed corresponding to each power were measured. And then plotted as shown in fig. 2.
The rotation speed value of the fan is obtained in step S1, and the resistance value of the corresponding system can be directly found from the rotation speed value on the horizontal axis in the graph shown in fig. 2. For example, when the rotation speed is 1570r/min, the resistance of the system is 20 Pa.
S3B: and according to the resistance of the system, based on a preset air volume-resistance-power relation, finding out the required power of the motor required by reaching the preset air volume.
As described above, the corresponding value of the air volume and the power is obtained from the air volume-resistance-power relationship table shown in fig. 4 using the system resistance obtained in step S2. Assuming that the system resistance under the current condition of the fresh air system is 100Pa and the desired air volume (constant air volume) input by the user is 210CHM in step S2, the corresponding power is 60W, which is obtained from the table shown in fig. 2. This means that under the current working condition, the fresh air system needs to reach the air volume of 210CHM, and the motor power needs to be set to 60W.
The fresh air systems of different specifications and models have different air volume-resistance-power relationships, so that the fresh air systems need to be tested before leaving the factory and written into the chip of the control unit 10. The specific test procedure is as follows.
And randomly extracting a plurality of fresh air systems with the same specification and model as the to-be-tested machines. And connecting the machine under test to a test system. Then, the motor is firstly enabled to work at rated power, the air quantity is monitored through the anemometer, and the current resistance is read through the pressure meter. Then, the power was gradually decreased, and the air volume and the resistance corresponding to each power were measured, and finally plotted as a curve shown in fig. 4.
It should be noted that the relationship shown in fig. 2 and fig. 4 can be obtained by a single test. For example, during testing, the motor is firstly enabled to work at rated power, the air quantity is monitored through the anemometer, and the current resistance is read through the pressure meter; the current speed is read by a tachometer. Then, the power was gradually decreased, and the air volume, the resistance, and the rotation speed corresponding to each power were measured. Finally, according to the resistance and the rotating speed under each power, drawing a curve shown in fig. 2; and then drawing a curve shown in figure 4 according to the resistance and the air volume under each power.
S4B: and adjusting the actual power of the fan operation according to the required power obtained in the step S3, and keeping the fan operating at the required power.
In this embodiment, the manner of laboratory testing is different from that of the first embodiment. Because the laboratory has abundant detection tools, when the resistance-rotating speed relation or the air volume-resistance-power relation is obtained in the laboratory, each manufacturer can measure and manufacture the resistance-rotating speed relation or the air volume-resistance-power relation according to the conditions of the own laboratory before the fresh air system leaves the factory. The foregoing detection methods are not to be construed as limiting the invention.
< third embodiment >
The following describes an adaptive constant-air-volume fresh air control method according to a third embodiment of the present invention with reference to fig. 4.
After the new working conditions such as product installation or maintenance are determined, system initialization is performed, and the adaptive constant air volume fresh air control method provided by the third embodiment of the invention is started, and the method comprises the following steps:
s10: periodically judging whether the resistance detection time of the last system exceeds the interval time, and if not, entering the step S12; if so, the flow proceeds to step S11.
S11: and detecting the resistance of the system to obtain the resistance of the system under the current working condition.
Step S11 includes the aforementioned S1A and S2A steps, or S1B and S2B steps. In other words, step S10 is also included before step S1A or S1B. And will not be described in detail herein. As mentioned above, based on the predetermined relationship between the rotation speed and the system resistance, the system resistance corresponding to the rotation speed value is obtained as the system resistance of the fresh air system under the current working condition.
S12: and selecting the required power according to the resistance of the system and the acquired air volume requirement.
This step is similar to step S3A or step S3B. The user inputs the expected air volume or selects the expected air volume by shifting gears. The air volume gear or the air volume value set by the user is read as the expected air volume, and then the power value in the curve shown in fig. 4 is found as the required power by using the resistance of the system detected in steps S1A to S2A and the expected air volume (from the gear preset or the customer setting) based on the air volume-resistance-power relationship (the curve shown in fig. 4) prestored in the control unit 10 of the fresh air system of the specification in the manner of step S3A or step S3B. Wherein the required power is the power required by the motor 20 for the fresh air system at the expected air volume and the known system resistance.
S13: and adjusting the power of the fan according to the required power, and keeping the fan running at the required power.
This step is the same as the step S4A or S4B, and is not repeated herein.
S14: judging whether the difference value between the current power and the required power is within an allowable range, if so, keeping the current state to operate, and entering the step 16; if not, the flow proceeds to step S15.
The control unit 10 compares the current power of the motor 20 with the required power and keeps the current state to continue the operation if the difference is within the allowable range, otherwise it is necessary to adjust the motor power until the power is within the deviation range.
S15: and controlling the fan rotating speed according to the required power, adjusting the equipment state, reading the current fan rotating speed, calculating the corresponding current power, and returning to the step S14.
S16: keeping the current state running, starting timing, and waiting for the next detection period to arrive to execute step S10 (i.e., step S1A or S1B).
Under the condition that the expected air volume is not changed, the fresh air system can stably run for a long time under the specific air volume through the process.
If the customer adjusts the expected air volume by adjusting the gear or resetting, after the control unit detects the new expected air volume, the control unit finds the required power again according to the new expected air volume and the detected resistance of the system, and then adjusts the power to the stable state under the new expected air volume so as to achieve the technical effect that the constant air volume can be achieved under each expected air volume.
Generally, there are two main factors that affect the system pipe resistance: firstly, when the pipeline is installed, the pipeline states (such as length and steering) are different; secondly, the blockage degree of the filter is ensured in the normal operation process of the equipment. When the fresh air system is started and the resistance detection program of the system is operated for the first time, the resistance value of the system influenced by different pipeline states can be detected. However, as the normal use time of the fresh air system becomes longer, the blockage of the filter becomes more serious, and the resistance of the system becomes larger and larger. If the user replaces or cleans the filter, the resistance of the system will suddenly decrease. That is, the resistance of the system is constantly changed, so that the resistance detection program of the system needs to be run once every certain time to detect the pipeline resistance of the system again. Therefore, the present embodiment employs a mode of periodic triggering.
< fourth embodiment >
As shown in fig. 6, unlike the periodic trigger mode in the third embodiment, the event trigger mode is adopted in the fourth embodiment, and a step of changing the expected air volume by the user is added.
Specifically, the adaptive constant-air-volume fresh air control method provided by the fourth embodiment of the present invention includes steps S10 to S16, which are the same as the corresponding steps in the third embodiment and are not repeated herein. However, the following steps are also included after step S16:
s17: judging whether a new expected air volume is received or not in real time, and if so, continuously executing the step; if there is a change, the process proceeds to step S18.
S18: judging whether the resistance of the system needs to be detected again, and returning to the step S11 if the resistance of the system needs to be detected again; if not, return to step S12 (i.e., S3A or S3B).
It should be noted that the technical features of the above embodiments may be arbitrarily combined. For the sake of brevity, all possible combinations of features in the above-described embodiments may not be described. However, as long as there is no contradiction between combinations of these technical features, the scope of the present specification should be considered as being described.
Compared with the prior art, the self-adaptive constant air volume fresh air control method and the system provided by the invention can maintain the expected air volume by self-adaptively adjusting the rotating speed of the fan, thereby being more energy-saving and environment-friendly; in addition, a special fan is not needed, any additional detection instrument or element is not needed, the rotating speed can be adjusted in a self-adaptive mode according to the working condition change by only utilizing a tachometer of the fan, the expected air volume is kept, the implementation cost is reduced, and the problems that an electric control unit in an existing fresh air system is high in manufacturing cost and easy to damage are fundamentally solved.
The self-adaptive constant air volume fresh air control method and system provided by the invention are explained in detail above. It will be apparent to those skilled in the art that any obvious modifications thereof can be made without departing from the spirit of the invention, which infringes the patent right of the invention and bears the corresponding legal responsibility.
Claims (10)
1. A self-adaptive constant air volume fresh air control method is characterized by comprising the following steps:
s1: changing the power of a motor and detecting the rotating speed of a fan to obtain a rotating speed value corresponding to the power;
s2: obtaining the resistance of the system corresponding to the rotating speed value based on a preset rotating speed-system resistance relation;
s3: obtaining the required power of the motor required for reaching the preset air volume based on a preset air volume-resistance-power relation according to the resistance of the system;
s4: and adjusting the actual power of the fan operation according to the required power obtained in the step S3, and keeping the fan operating at the required power.
2. The adaptive constant air volume fresh air control method according to claim 1, characterized in that:
in the step S1, the motor operates at a rated power or at a predetermined power, and a real-time rotation speed of the fan is obtained;
within a preset time length, after gradually changing the power of the motor, carrying out multiple detections to respectively obtain real-time rotating speeds corresponding to each power;
and taking the average value of the real-time rotating speeds under the same power as a rotating speed value corresponding to the power.
3. The adaptive constant air volume fresh air control method according to claim 1 or 2,
in step S2, the relationship between the rotational speed and the system resistance is a graph with the rotational speed and the system resistance as coordinate axes, or a table with the rotational speed and the system resistance as horizontal or vertical columns; wherein, the fresh air systems of different models have different rotating speed-system resistance relations.
4. The adaptive constant air volume fresh air control method according to claim 3, wherein the relationship between the rotating speed and the resistance of the system is obtained by:
starting a motor to work at a rated power or a maximum gear, and enabling a fresh air system to be tested to reach a preset air volume by monitoring the air volume after the motor is stable;
then, changing the resistance value of the system to sequentially increase the resistance value of the air path of the fresh air system in the laboratory;
and under the resistance value of each system, measuring the corresponding fan rotating speed under the resistance value of the corresponding system by using a tachometer.
5. The adaptive constant air volume fresh air control method according to claim 4, characterized in that:
setting the current air volume as a first air volume and keeping the current air volume unchanged, and measuring the corresponding input power of the motor under each resistance value by continuously changing the resistance value of the system to form a curve of the first air volume;
setting the current air volume as a second air volume and keeping the current air volume unchanged, and measuring the corresponding input power of the motor under each resistance value by continuously changing the resistance value of the system to form a curve of the second air volume;
obtaining curves of all air volumes in a similar mode, wherein each curve of the air volume comprises a corresponding relation between a resistance value and power of a system;
and forming an air volume-resistance-power curve graph according to the curves of the air volumes.
6. The adaptive constant air volume fresh air control method according to claim 3, wherein the relationship between the rotation speed and the resistance of the system and the relationship between the air volume and the resistance and the power are obtained by:
firstly, enabling the motor to work at a rated power, monitoring the air quantity through an anemometer, and reading the current resistance through a pressure gauge; reading the current rotating speed by using a tachometer; gradually reducing the power, and measuring the air volume, the resistance and the rotating speed corresponding to each power; finally, obtaining the resistance relation of the rotating speed-system according to the resistance and the rotating speed under each power; and obtaining the air volume-resistance-power relation according to the resistance and the air volume under each power.
7. The adaptive constant air volume fresh air control method according to claim 3, characterized in that:
the speed-system resistance relationship is obtained by: firstly, enabling a motor to work at rated power, and reading the current resistance by using a pressure gauge; reading the current rotating speed by using a tachometer; then, gradually reducing the power, and measuring the resistance and the rotating speed corresponding to each power to obtain the resistance relation of the rotating speed-system;
the air volume-resistance-power relation is obtained by the following method: firstly, enabling a motor to work at a rated power, monitoring air quantity through an anemometer, and reading current resistance through a pressure gauge; then, the power is gradually reduced, and the air volume and the resistance corresponding to each power are measured to obtain the relationship of the air volume, the resistance and the power.
8. The adaptive constant air volume fresh air control method according to claim 3, characterized by further comprising, after step S4:
s14: judging whether the difference value between the current power and the required power is in an allowable range, if so, keeping the current state to operate, and entering the step 16; if not, go to step S15;
s15: controlling the rotating speed of the fan according to the required power, adjusting the state of the equipment, reading the rotating speed of the current fan, calculating the corresponding current power, and returning to the step S14;
s16: keeping the current state running, starting timing, and waiting for the next detection period to arrive to execute step S1.
9. The adaptive constant air volume fresh air control method according to claim 8, characterized by further comprising the following steps after the step S16:
s17: judging whether a new expected air volume is received in real time, and if so, continuously executing the step; if there is a change, go to step S18;
s18: judging whether the resistance of the system needs to be detected again, and returning to the step S11 if the resistance of the system needs to be detected again; if not, return to step S3.
10. A self-adaptive constant air volume fresh air system is characterized by comprising a control unit, a motor, a fan, a heat exchanger and a tachometer arranged on the fan; wherein the content of the first and second substances,
the control unit controls the power of the motor by using the self-adaptive constant air volume fresh air control method of any one of claims 1 to 9, so as to continuously adjust the rotating speed of the fan by changing the power of the motor in a self-adaptive manner.
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Application publication date: 20220809 |