CN107238240B - Air-cooled water chilling unit and control method and device of fan of air-cooled water chilling unit - Google Patents
Air-cooled water chilling unit and control method and device of fan of air-cooled water chilling unit Download PDFInfo
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- CN107238240B CN107238240B CN201710516142.7A CN201710516142A CN107238240B CN 107238240 B CN107238240 B CN 107238240B CN 201710516142 A CN201710516142 A CN 201710516142A CN 107238240 B CN107238240 B CN 107238240B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
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Abstract
The invention discloses an air-cooled water chilling unit and a control method and a device of a fan thereof, wherein the method comprises the following steps: in the running process of the air-cooled water chilling unit, acquiring the exhaust pressure and the return pressure of the compressor at intervals of a first preset time, and acquiring the actual compression ratio of the compressor according to the exhaust pressure and the return pressure; if the actual compression ratio is greater than the sum of the preset compression ratio and the first preset value, carrying out loading control on the fan; if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, unloading control is carried out on the fan; and if the actual compression ratio is greater than or equal to the difference between the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and the first preset value, controlling the fan to keep the current state unchanged. Therefore, the compressor can be ensured to be always under higher working efficiency, so that the service life of the unit is effectively prolonged, and the stability and energy conservation of the unit are improved.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a control method of a fan in an air-cooled water chilling unit, a control device of the fan in the air-cooled water chilling unit and the air-cooled water chilling unit with the control device.
Background
Generally, a compressor commonly used in an air-cooled water chiller is a displacement compressor, the operation range of the chiller is wide, and compared with a speed compressor, the surge risk is avoided. In addition, since the suction and discharge of the gas of the displacement compressor are realized by the volume change of the working chamber of the compressor, and the relationship with the gas property is not large, the pressure ratio is not sensitive, so when the fan on the side of the fin heat exchanger is controlled, the high pressure is generally divided into several sections, and the corresponding number of fans is turned on or off in different sections.
When the fans are fixed-frequency fans, the purpose of adjusting the air volume and the high-pressure side pressure is achieved only by grouping the fans as much as possible and opening or closing the corresponding fan groups in different pressure intervals. However, when the fan is turned off, the air volume changes greatly, which results in obvious compression ratio changes, and for a volume type compressor which is not very sensitive to the compression ratio, the unbalanced pressure adjustment also results in untimely adjustment of the rotating speed of the compressor, which is easy to cause surging and very fatal damage to the compressor. And the opening and closing of the fan are controlled according to the high-pressure, so that the compressor cannot exert the highest energy efficiency, and the reliability and the energy saving performance of the unit are greatly influenced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the first objective of the present invention is to provide a method for controlling a fan in an air-cooled chiller, which can ensure that the chiller can operate at a better compression ratio for a long time under any working condition by controlling the fan according to the compression ratio of a compressor, so that the compressor is always at a higher working efficiency, thereby effectively prolonging the service life of the chiller, improving the stability of the chiller and saving energy.
A second object of the invention is to propose a computer-readable storage medium.
The third purpose of the invention is to provide a control device of a fan in an air-cooled water chilling unit.
The fourth purpose of the invention is to provide an air-cooled water chilling unit.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for controlling a fan in an air-cooled chiller, where the fan includes multiple fan sub-modules or the fan is a variable frequency fan, and the method includes the following steps: in the running process of the air-cooled water chilling unit, acquiring the exhaust pressure and the return pressure of a compressor at intervals of a first preset time, acquiring the actual compression ratio of the compressor according to the exhaust pressure and the return pressure, and judging the actual compression ratio; if the actual compression ratio is larger than the sum of a preset compression ratio and a first preset value, carrying out loading control on the fan; if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, unloading control is carried out on the fan; and if the actual compression ratio is greater than or equal to the difference between the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and the first preset value, controlling the fan to keep the current state unchanged.
According to the control method of the fan in the air-cooled water chilling unit, in the operation process of the air-cooled water chilling unit, the exhaust pressure and the return pressure of the compressor are obtained at intervals of a first preset time, the actual compression ratio of the compressor is obtained according to the exhaust pressure and the return pressure, and if the actual compression ratio is larger than the sum of the preset compression ratio and a first preset value, the fan is subjected to loading control; if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, unloading control is carried out on the fan; and if the actual compression ratio is greater than or equal to the difference between the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and the first preset value, controlling the fan to keep the current state unchanged. Therefore, the compressor can be ensured to be always under higher working efficiency, so that the service life of the unit is effectively prolonged, and the stability and energy conservation of the unit are improved.
According to an embodiment of the invention, when the fan is subjected to loading control, if the actual compression ratio is greater than the sum of the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and a second preset value, a fan submodule of the fan is controlled to be started or the frequency of the fan is increased by a first preset frequency, and the actual compression ratio is judged again after the first preset time is delayed, wherein the second preset value is greater than the first preset value; and if the actual compression ratio is greater than the sum of the preset compression ratio and the second preset value, controlling a fan submodule of the fan to be started or increasing the frequency of the fan by the first preset frequency, and judging the actual compression ratio again after delaying for a second preset time, wherein the second preset time is less than the first preset time.
According to another embodiment of the invention, when the fan is subjected to unloading control, wherein if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value and is greater than or equal to the difference between the preset compression ratio and a second preset value, controlling a fan submodule of the fan to close or reducing the frequency of the fan by a first preset frequency, and judging the actual compression ratio again after delaying the first preset time, wherein the second preset value is greater than the first preset value; if the actual compression ratio is smaller than the difference between the preset compression ratio and the second preset value, controlling a fan submodule of the fan to close or reducing the frequency of the fan by the first preset frequency, and judging the actual compression ratio again after delaying for a second preset time, wherein the second preset time is smaller than the first preset time.
According to one embodiment of the invention, the compressor comprises one or more of a conventional centrifugal compressor, a variable frequency centrifugal compressor, a magnetic levitation oil-free compressor, and an oil-free air flotation compressor.
In order to achieve the above object, a second embodiment of the present invention provides a computer-readable storage medium having instructions stored therein, where the instructions, when executed, implement the above method for controlling a fan in an air-cooled chiller.
The computer-readable storage medium of the embodiment of the invention can ensure that the compressor is always in a higher working efficiency by executing the control method of the fan, thereby effectively prolonging the service life of the unit, improving the stability of the unit and saving energy.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides a control device for a fan in an air-cooled chiller, where the fan includes a plurality of fan submodules or the fan is a variable frequency fan, and the control device includes: the acquisition module is used for acquiring the exhaust pressure and the return pressure of a compressor at intervals of a first preset time in the running process of the cold water chilling unit and acquiring the actual compression ratio of the compressor according to the exhaust pressure and the return pressure; the judging module is used for judging the actual compression ratio; the control module is connected with the judging module and used for carrying out loading control on the fan when the actual compression ratio is larger than the sum of a preset compression ratio and a first preset value, carrying out unloading control on the fan when the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, and controlling the fan to keep the current state unchanged when the actual compression ratio is larger than or equal to the difference between the preset compression ratio and the first preset value and smaller than or equal to the sum of the preset compression ratio and the first preset value.
According to the control device of the fan in the air-cooled water chilling unit, in the running process of the water chilling unit, the exhaust pressure and the return pressure of the compressor are obtained by the obtaining module every other first preset time, the actual compression ratio of the compressor is obtained according to the exhaust pressure and the return pressure, the actual compression ratio is judged by the judging module, and if the actual compression ratio is larger than the sum of the preset compression ratio and the first preset value, the control module carries out loading control on the fan; if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, the control module carries out unloading control on the fan; and if the actual compression ratio is greater than or equal to the difference between the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and the first preset value, the control module controls the fan to keep the current state unchanged. Therefore, the compressor can be ensured to be always under higher working efficiency, so that the service life of the unit is effectively prolonged, and the stability and energy conservation of the unit are improved.
According to an embodiment of the present invention, when the control module performs loading control on the fan, if the actual compression ratio is greater than the sum of the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and a second preset value, the control module controls a fan submodule of the fan to be turned on or increases the frequency of the fan by a first preset frequency, and after delaying the first preset time, the determination module determines the actual compression ratio again, where the second preset value is greater than the first preset value; if the actual compression ratio is larger than the sum of the preset compression ratio and the second preset value, the control module controls a fan submodule of the fan to be started or increases the frequency of the fan by the first preset frequency, and after delaying for a second preset time, the judgment module judges the actual compression ratio again, wherein the second preset time is smaller than the first preset time.
According to another embodiment of the invention, when the control module performs unloading control on the fan, if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value and is greater than or equal to the difference between the preset compression ratio and a second preset value, the control module controls a fan submodule of the fan to close or reduces the frequency of the fan by a first preset frequency, and after delaying the first preset time, the judgment module judges the actual compression ratio again, wherein the second preset value is greater than the first preset value; if the actual compression ratio is smaller than the difference between the preset compression ratio and the second preset value, the control module controls a fan submodule of the fan to close or reduces the frequency of the fan by the first preset frequency, and after delaying for a second preset time, the judgment module judges the actual compression ratio again, wherein the second preset time is smaller than the first preset time.
According to one embodiment of the invention, the compressor comprises one or more of a conventional centrifugal compressor, a variable frequency centrifugal compressor, a magnetic levitation oil-free compressor, and an oil-free air flotation compressor.
In order to achieve the above object, a fourth aspect of the present invention provides an air-cooled chiller, which includes the control device for a fan in the air-cooled chiller.
According to the air-cooled water chilling unit provided by the embodiment of the invention, the compressor can be ensured to be always in a higher working efficiency through the control device of the fan, so that the service life of the unit is effectively prolonged, the stability of the unit is improved, and energy is saved.
Drawings
FIG. 1 is a system block diagram of an air-cooled chiller according to one embodiment of the present invention;
fig. 2 is a flowchart of a control method of a fan in an air-cooled chiller according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the control logic for the fans in the air-cooled chiller according to one embodiment of the present invention; and
fig. 4 is a block diagram illustrating a control device for a fan in an air-cooled chiller according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a control method for a fan in an air-cooled chiller, a control device for a fan in an air-cooled chiller, and an air-cooled chiller having the control device, which are provided according to embodiments of the present invention, with reference to the accompanying drawings.
Fig. 1 is a system configuration diagram of an air-cooled chiller according to an embodiment of the present invention. As shown in fig. 1, the air-cooled chiller may include a compressor 10, an air-cooled finned heat exchanger 20, a throttling element 30, a shell-and-tube evaporator 40, and a fan 21 disposed on top of the air-cooled finned heat exchanger 20.
The compressor 10 comprises an air return port and an air exhaust port, the air exhaust port of the compressor 10 is connected with one end of the air-cooled finned heat exchanger 20 through a pipeline, the other end of the air-cooled finned heat exchanger 20 is connected with one end of the throttling element 30 through a pipeline, the other end of the throttling element 30 is connected with one end of the shell-and-tube evaporator 40 through a pipeline, and the other end of the shell-and-tube evaporator 40 is connected with the air return port of the compressor 10 through a pipeline. Meanwhile, the shell-and-tube evaporator 40 is provided with a water inlet and a water outlet, and is connected to a water system pipeline of a user end through a pipeline.
When the air-cooled water chiller works, high-temperature and high-pressure gaseous refrigerant coming out of the compressor 10 enters the air-cooled finned heat exchanger 20 through a pipeline to exchange heat, meanwhile, forced heat exchange is carried out through a fan 21 arranged at the top of the air-cooled finned heat exchanger 20, low-temperature liquid refrigerant after heat exchange enters the shell-and-tube evaporator 40 through the throttling element 30 to exchange heat with water entering the shell-and-tube evaporator 40, so that water at a certain temperature is changed into cold water for a user to use, meanwhile, the refrigerant after heat exchange returns to an air suction port of the compressor 10 through the pipeline, and the steps are repeated in a circulating manner to provide cold water for the user.
Fig. 2 is a flowchart of a method for controlling fans in an air-cooled chiller according to an embodiment of the present invention. As shown in fig. 2, a method for controlling a fan in an air-cooled chiller according to an embodiment of the present invention may include the following steps:
and S1, in the running process of the air-cooled chiller, acquiring the exhaust pressure and the return pressure of the compressor at intervals of a first preset time, acquiring the actual compression ratio of the compressor according to the exhaust pressure and the return pressure, and judging the actual compression ratio. The first preset time can be calibrated according to actual conditions.
In embodiments of the invention, the compressor may comprise one or more of a conventional centrifugal compressor, a variable frequency centrifugal compressor, a magnetic levitation oil-free compressor, and an oil-free air flotation compressor.
Specifically, the discharge pressure P1 and the return pressure P2 of the compressor can be respectively obtained by providing pressure sensors at the discharge port and the return port of the compressor, and then the actual compression ratio P of the compressor is calculated and obtained as P1/P2 according to the discharge pressure P1 and the return pressure P2.
And S2, if the actual compression ratio is larger than the sum of the preset compression ratio and the first preset value, carrying out loading control on the fan.
The preset compression ratio and the first preset value can be calibrated according to actual conditions. Specifically, the compressor mainly adopts a centrifugal compressor which is sensitive to a compression ratio, so as to control the high pressure of the unit according to the characteristics of the centrifugal compressor, specifically, according to the characteristics of the centrifugal compressor, the optimal compression ratio (preset compression ratio) of the unit is determined through design, calculation and test, then the high pressure and the low pressure of the unit are collected, the actual compression ratio is calculated according to the high pressure and the low pressure, and finally, the fan is controlled through a proper control logic according to the actual compression ratio and the preset compression ratio.
And S3, if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, unloading the fan.
S4, if the actual compression ratio is larger than or equal to the difference between the preset compression ratio and the first preset value and smaller than or equal to the sum of the preset compression ratio and the first preset value, controlling the fan to keep the current state unchanged.
Specifically, in the process of running the air-cooled chiller, the discharge pressure P1 and the return pressure P2 of the compressor are obtained at intervals of a first preset time, the actual compression ratio P of the compressor is calculated, and then the actual compressor P is judged. When P is larger than a preset compression ratio P0+ a first preset value a, the fan is subjected to loading control to improve the heat exchange capacity of the air-cooled finned heat exchanger, so that the high pressure of the unit is reduced; when P is less than P0-a, unloading control is carried out on the fan to reduce the heat exchange capacity of the air-cooled finned heat exchanger, so that the high pressure of the unit is improved; and when P0-a is more than or equal to P0+ a, controlling the fan to keep the current state unchanged. Therefore, the compressor operates at an optimal compression ratio, and the compressor achieves higher efficiency and better stability and reliability.
In embodiments of the present invention, the fan may comprise a plurality of fan sub-modules or the fan may be a variable frequency fan. That is, the fan may include one or more of a fixed-frequency fan, a stepped speed regulation fan, and a variable-frequency stepless speed regulation fan, wherein, for the fixed-frequency fan and the stepped speed regulation fan, in order to make the air volume smoothly regulated as much as possible, a plurality of fixed-frequency fans or stepped speed regulation fans may be provided, and the plurality of fixed-frequency fans or stepped speed regulation fans are grouped to obtain a plurality of fan sub-modules, and when the fan is subjected to loading and unloading control, the corresponding fan sub-modules are turned on or off; for the frequency conversion stepless speed regulation fan, the fan can be composed of a frequency conversion stepless speed regulation fan, and when the fan is controlled to be loaded and unloaded, the frequency of the frequency conversion stepless speed regulation fan is adjusted.
According to one embodiment of the invention, when the fan is subjected to loading control, if the actual compression ratio is greater than the sum of the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and the second preset value, one fan submodule of the fan is controlled to be started or the frequency of the fan is increased by the first preset frequency, and the actual compression ratio is judged again after the first preset time is delayed; and if the actual compression ratio is greater than the sum of the preset compression ratio and a second preset value, controlling a fan submodule of the fan to start or increasing the frequency of the fan by the first preset frequency, and judging the actual compression ratio again after delaying for a second preset time, wherein the second preset value is greater than the first preset value, the second preset time is less than the first preset time, and the calibration can be specifically carried out according to the actual situation.
Specifically, as shown in fig. 3, the compression ratio within the range of the vertical deviation a of the preset compression ratio P0 is set as the optimal compression ratio. When P is more than P0+ a, whether P is less than or equal to the sum of P0 and a second preset value b is further judged, if P0+ a is more than P and less than or equal to P0+ b, the temperature and the pressure in the air-cooled finned heat exchanger are high, and at the moment, one or more fan sub-modules can be controlled to be started (for a fixed-frequency fan)/the frequency of the fan is increased by a first preset frequency (for a variable-frequency fan) so that the compression ratio is close to the optimal compression ratio. And after delaying the first preset time, acquiring the actual compression ratio P again, judging the actual compression ratio P, if P0+ a is larger than and equal to P0+ b, controlling one or more fan sub-modules to start/increase the frequency of the fan again by the first preset frequency, repeatedly executing until P is within the range of the vertical deviation a of the preset compression ratio P0, stopping starting/increasing the frequency of the fan sub-modules of the fan, and keeping the current state of the fan unchanged.
And if P is more than P0+ b, the temperature and the pressure in the air-cooled finned heat exchanger are high, and at the moment, one or more fan sub-modules of the fan are controlled to be started/the frequency of the fan is increased by a first preset frequency so that the compression ratio is close to the optimal compression ratio. And after delaying a second preset time (for example, the second preset time is the first preset time-3 s), judging P again, if P is more than P0+ b, controlling one or more fan sub-modules to be started/increasing the frequency of the fan again by the first preset frequency, repeatedly executing until P0+ a is more than P and less than or equal to P0+ b, then carrying out loading control on the fan according to a loading mode that P0+ a is more than P and less than or equal to P0+ b until P is within the range of the upper and lower deviation a of the preset compression ratio P0, stopping starting/increasing the frequency of the fan sub-modules of the fan, and keeping the current state of the fan unchanged.
According to another embodiment of the invention, when the fan is subjected to unloading control, wherein if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value and is greater than or equal to the difference between the preset compression ratio and the second preset value, one fan submodule of the fan is controlled to be turned off or the frequency of the fan is reduced by a first preset frequency, and the actual compression ratio is judged again after the first preset time is delayed; and if the actual compression ratio is smaller than the difference between the preset compression ratio and a second preset value, controlling a fan submodule of the fan to close or reducing the frequency of the fan by a first preset frequency, and judging the actual compression ratio again after delaying for a second preset time, wherein the second preset value is larger than the first preset value, and the second preset time is smaller than the first preset time.
Specifically, as shown in fig. 3, when P < P0-a, it is further determined whether P is greater than or equal to the difference between P0 and b, and if P0-b is less than or equal to P < P0-a, it indicates that the temperature and pressure in the air-cooled finned heat exchanger are low, and at this time, one or more fan sub-modules may be controlled to be turned off/the frequency of the fan is reduced by a first preset frequency, so that the compression ratio approaches the optimal compression ratio. And after delaying the first preset time, acquiring the actual compression ratio P again, judging the actual compression ratio P, if P0-b is more than or equal to P < P0-a, controlling one or more fan sub-modules to close again/reducing the frequency of the fan by the first preset frequency again until P is within the range of the vertical deviation a of the preset compression ratio P0, stopping closing the fan sub-modules of the fan/reducing the frequency of the fan, and keeping the current state of the fan unchanged.
And if P is less than P0-b, the temperature and pressure in the air-cooled finned heat exchanger are low, and at the moment, one or more fan sub-modules are controlled to be closed/the frequency of the fan is reduced by a first preset frequency, so that the compression ratio is close to the optimal compression ratio. And after delaying a second preset time (for example, the second preset time is the first preset time-3), judging P again, if P is still more than P0-b, controlling one or more fan sub-modules to be closed/reducing the frequency of the fan again by the first preset frequency, repeatedly executing until P0-b is more than or equal to P < P0-a, then carrying out unloading control on the fan according to an unloading mode that P0-b is more than or equal to P < P0-a until P is within the range of the upper and lower deviation a of the preset compression ratio P0, stopping closing the fan sub-modules of the fan/stopping reducing the frequency of the fan, and keeping the current state of the fan unchanged.
Therefore, the control method of the fan in the air-cooled water chilling unit provided by the embodiment of the invention controls the fan according to the actual compression ratio and the optimal compression ratio of the compressor, so that the unit can be as close to the optimal compression ratio as possible under any working condition, the unit is more suitable for the characteristics of a centrifugal compressor under the condition of long-time operation at a better compression ratio, the adjustment of the unit is more humanized, and the performance is better. Meanwhile, the fans are grouped as many as possible or the multi-stage fan speed regulation and variable-frequency speed regulation fans are adopted to achieve smooth regulation as much as possible, so that frequent regulation (such as frequent loading and unloading of a fixed-frequency compressor) or surging of the compressor can be effectively avoided, the service life of the unit is effectively prolonged, and the stability, reliability, performance and energy conservation of the unit are improved.
In summary, according to the control method of the fan in the air-cooled chiller unit in the embodiment of the present invention, in the operation process of the air-cooled chiller unit, the discharge pressure and the return pressure of the compressor are obtained at intervals of the first preset time, and the actual compression ratio of the compressor is obtained according to the discharge pressure and the return pressure, wherein if the actual compression ratio is greater than the sum of the preset compression ratio and the first preset value, the fan is subjected to loading control; if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, unloading control is carried out on the fan; and if the actual compression ratio is greater than or equal to the difference between the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and the first preset value, controlling the fan to keep the current state unchanged. Therefore, the compressor can be ensured to be always under higher working efficiency, so that the service life of the unit is effectively prolonged, and the stability and energy conservation of the unit are improved.
Fig. 4 is a block diagram illustrating a control device for a fan in an air-cooled chiller according to an embodiment of the present invention. In embodiments of the present invention, the fan may comprise a plurality of fan sub-modules or the fan may be a variable frequency fan.
As shown in fig. 4, the control device for a fan in an air-cooled chiller according to an embodiment of the present invention may include: an acquisition module 100, a judgment module 200 and a control module 300.
The obtaining module 100 is configured to obtain an exhaust pressure and an air return pressure of the compressor every first preset time in a running process of the water chilling and cooling unit, and obtain an actual compression ratio of the compressor according to the exhaust pressure and the air return pressure. The determination module 200 is used for determining the actual compression ratio. The control module 300 is connected to the judging module 200, and the control module 300 is configured to perform loading control on the fan when the actual compression ratio is greater than the sum of the preset compression ratio and the first preset value, perform unloading control on the fan when the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, and control the fan to keep the current state unchanged when the actual compression ratio is greater than or equal to the difference between the preset compression ratio and the first preset value and is smaller than or equal to the sum of the preset compression ratio and the first preset value.
According to an embodiment of the present invention, when the control module 300 performs loading control on the fan, wherein if the actual compression ratio is greater than the sum of the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and the second preset value, the control module 300 controls a fan submodule of the fan to be turned on or increases the frequency of the fan by the first preset frequency, and after delaying the first preset time, the determination module 200 determines the actual compression ratio again, wherein the second preset value is greater than the first preset value; if the actual compression ratio is greater than the sum of the preset compression ratio and a second preset value, the control module 300 controls a fan submodule of the fan to be started or increases the frequency of the fan by a first preset frequency, and after delaying for a second preset time, the actual compression ratio is judged again through the judgment module 200, wherein the second preset time is less than the first preset time.
According to another embodiment of the present invention, when the control module 300 performs the unloading control on the fan, wherein if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value and is greater than or equal to the difference between the preset compression ratio and the second preset value, the control module 300 controls a fan submodule of the fan to close or reduces the frequency of the fan by the first preset frequency, and after delaying the first preset time, the determination module 200 determines the actual compression ratio again, wherein the second preset value is greater than the first preset value; if the actual compression ratio is smaller than the difference between the preset compression ratio and the second preset value, the control module 300 controls a fan submodule of the fan to close or reduces the frequency of the fan by a first preset frequency, and after delaying for a second preset time, the actual compression ratio is judged again through the judgment module 200, wherein the second preset time is smaller than the first preset time.
According to one embodiment of the invention, the compressor may comprise one or more of a conventional centrifugal compressor, a variable frequency centrifugal compressor, a magnetic levitation oil-free compressor, and an oil-free air flotation compressor.
It should be noted that details, which are not disclosed in the control device of the fan in the air-cooled chiller according to the embodiment of the present invention, please refer to details disclosed in the control method of the fan in the air-cooled chiller according to the embodiment of the present invention, and are not described herein again in detail.
According to the control device of the fan in the air-cooled water chilling unit, in the running process of the water chilling unit, the exhaust pressure and the return pressure of the compressor are obtained by the obtaining module every other first preset time, the actual compression ratio of the compressor is obtained according to the exhaust pressure and the return pressure, the actual compression ratio is judged by the judging module, and if the actual compression ratio is larger than the sum of the preset compression ratio and the first preset value, the control module carries out loading control on the fan; if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, the control module carries out unloading control on the fan; and if the actual compression ratio is greater than or equal to the difference between the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and the first preset value, the control module controls the fan to keep the current state unchanged. Therefore, the compressor can be ensured to be always under higher working efficiency, so that the service life of the unit is effectively prolonged, and the stability and energy conservation of the unit are improved.
In addition, the embodiment of the invention also provides a computer readable storage medium, which has instructions stored therein, and when the instructions are executed, the method for controlling the fan in the air-cooled water chilling unit is executed.
The computer-readable storage medium of the embodiment of the invention can ensure that the compressor is always in a higher working efficiency by executing the control method of the fan, thereby effectively prolonging the service life of the unit, improving the stability of the unit and saving energy.
In addition, the embodiment of the invention also provides an air-cooled water chilling unit, which comprises the control device of the fan in the air-cooled water chilling unit.
According to the air-cooled water chilling unit provided by the embodiment of the invention, the compressor can be ensured to be always in a higher working efficiency through the control device of the fan, so that the service life of the unit is effectively prolonged, the stability of the unit is improved, and energy is saved.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In addition, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A control method for a fan in an air-cooled water chilling unit is characterized in that the fan comprises a plurality of fan sub-modules or the fan is a variable frequency fan, and the control method comprises the following steps:
in the running process of the air-cooled water chilling unit, acquiring the exhaust pressure and the return pressure of a compressor at intervals of a first preset time, acquiring the actual compression ratio of the compressor according to the exhaust pressure and the return pressure, and judging the actual compression ratio;
if the actual compression ratio is larger than the sum of the preset compression ratio and a first preset value, carrying out loading control on the fan, wherein when the fan comprises a plurality of fan sub-modules, the corresponding fan sub-modules are started when carrying out loading control on the fan, and when the fan is a variable frequency fan, the frequency of the fan is increased when carrying out loading control on the fan;
if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value, unloading the fan, wherein when the fan comprises a plurality of fan sub-modules, the corresponding fan sub-modules are closed when the fan is unloaded, and when the fan is a variable frequency fan, the frequency of the fan is reduced when the fan is unloaded;
and if the actual compression ratio is greater than or equal to the difference between the preset compression ratio and the first preset value and is less than or equal to the sum of the preset compression ratio and the first preset value, controlling the fan to keep the current state unchanged.
2. The method for controlling the fan of the air-cooled chiller according to claim 1, wherein, when the fan is subjected to load control,
if the actual compression ratio is larger than the sum of the preset compression ratio and the first preset value and is smaller than or equal to the sum of the preset compression ratio and a second preset value, controlling a fan submodule of the fan to be started or increasing the frequency of the fan by a first preset frequency, and judging the actual compression ratio again after delaying the first preset time, wherein the second preset value is larger than the first preset value;
and if the actual compression ratio is greater than the sum of the preset compression ratio and the second preset value, controlling a fan submodule of the fan to be started or increasing the frequency of the fan by the first preset frequency, and judging the actual compression ratio again after delaying for a second preset time, wherein the second preset time is less than the first preset time.
3. The method for controlling a fan in an air-cooled chiller according to claim 1, wherein, in unloading control of said fan,
if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value and is larger than or equal to the difference between the preset compression ratio and a second preset value, controlling a fan submodule of the fan to close or reducing the frequency of the fan by a first preset frequency, and judging the actual compression ratio again after delaying the first preset time, wherein the second preset value is larger than the first preset value;
if the actual compression ratio is smaller than the difference between the preset compression ratio and the second preset value, controlling a fan submodule of the fan to close or reducing the frequency of the fan by the first preset frequency, and judging the actual compression ratio again after delaying for a second preset time, wherein the second preset time is smaller than the first preset time.
4. The method for controlling the fan in the air-cooled water chilling unit according to any one of claims 1-3, wherein the compressor comprises one or more of a conventional centrifugal compressor, a variable frequency centrifugal compressor, a magnetic suspension oil-free compressor and an oil-free air flotation compressor.
5. A computer-readable storage medium having instructions stored therein which, when executed, perform a method of controlling a fan in an air-cooled chiller as set forth in any one of claims 1-4.
6. The utility model provides a controlling means of fan in air-cooled cooling water set which characterized in that, the fan includes a plurality of fan submodule pieces or the fan is the frequency conversion fan, controlling means includes:
the acquisition module is used for acquiring the exhaust pressure and the return pressure of a compressor at intervals of a first preset time in the running process of the cold water chilling unit and acquiring the actual compression ratio of the compressor according to the exhaust pressure and the return pressure;
the judging module is used for judging the actual compression ratio;
a control module, connected to the determination module, for performing loading control on the fan when the actual compression ratio is greater than the sum of a preset compression ratio and a first preset value, performing unloading control on the fan when the actual compression ratio is less than the difference between the preset compression ratio and the first preset value, and controlling the fan to keep the current state unchanged when the actual compression ratio is greater than or equal to the difference between the preset compression ratio and the first preset value and less than or equal to the sum of the preset compression ratio and the first preset value, wherein,
when the fan comprises a plurality of fan sub-modules, the corresponding fan sub-modules are started when the fan is subjected to loading control, and when the fan is a variable frequency fan, the frequency of the fan is controlled to be increased when the fan is subjected to loading control; when the fan comprises a plurality of fan sub-modules, the corresponding fan sub-modules are closed when the fan is subjected to unloading control, and when the fan is a variable frequency fan and the fan is subjected to loading control, the frequency of the fan is reduced.
7. The control device for the fan in the air-cooled chiller according to claim 6, wherein said control module is configured to perform load control on said fan,
if the actual compression ratio is larger than the sum of the preset compression ratio and the first preset value and is smaller than or equal to the sum of the preset compression ratio and a second preset value, the control module controls a fan submodule of the fan to be started or increases the frequency of the fan by a first preset frequency, and after the first preset time is delayed, the actual compression ratio is judged again through the judgment module, wherein the second preset value is larger than the first preset value;
if the actual compression ratio is larger than the sum of the preset compression ratio and the second preset value, the control module controls a fan submodule of the fan to be started or increases the frequency of the fan by the first preset frequency, and after delaying for a second preset time, the judgment module judges the actual compression ratio again, wherein the second preset time is smaller than the first preset time.
8. The control device for the fan in the air-cooled chiller according to claim 6, wherein said control module performs unloading control of said fan,
if the actual compression ratio is smaller than the difference between the preset compression ratio and the first preset value and is larger than or equal to the difference between the preset compression ratio and a second preset value, the control module controls a fan submodule of the fan to be closed or reduces the frequency of the fan by a first preset frequency, and after the first preset time is delayed, the actual compression ratio is judged again through the judgment module, wherein the second preset value is larger than the first preset value;
if the actual compression ratio is smaller than the difference between the preset compression ratio and the second preset value, the control module controls a fan submodule of the fan to close or reduces the frequency of the fan by the first preset frequency, and after delaying for a second preset time, the judgment module judges the actual compression ratio again, wherein the second preset time is smaller than the first preset time.
9. The control device for the fan in the air-cooled water chilling unit according to any one of claims 6-8, wherein the compressor comprises one or more of a conventional centrifugal compressor, a variable frequency centrifugal compressor, a magnetic suspension oil-free compressor and an oil-free air flotation compressor.
10. An air-cooled chiller according to any one of claims 6 to 9 including control means for a fan in the air-cooled chiller.
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| CN107576019B (en) * | 2017-10-12 | 2019-10-01 | 广东美的暖通设备有限公司 | Air-conditioning system and its pressure ratio control method and control device |
| CN108662818A (en) * | 2018-05-04 | 2018-10-16 | 重庆美的通用制冷设备有限公司 | The control method and device of cooling by wind wind turbine pressure ratio |
| CN109855338B (en) * | 2019-02-15 | 2021-05-25 | 青岛海尔空调电子有限公司 | Air-cooled magnetic suspension centrifugal unit and shutdown control method thereof |
| CN110006139B (en) * | 2019-03-04 | 2021-12-28 | 青岛海尔空调电子有限公司 | Control method for air-cooled magnetic suspension unit |
| CN110006140A (en) * | 2019-03-04 | 2019-07-12 | 青岛海尔空调电子有限公司 | Control method and air-cooled magnetic suspension unit for air-cooled magnetic suspension unit |
| CN110986406A (en) * | 2019-12-19 | 2020-04-10 | 依米康科技集团股份有限公司 | Multi-split VRV device for machine room, control method and system |
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| US8813511B2 (en) * | 2009-03-31 | 2014-08-26 | Johnson Controls Technology Company | Control system for operating condenser fans |
| CN105627496A (en) * | 2014-10-29 | 2016-06-01 | 青岛海尔空调器有限总公司 | Low-temperature refrigerating control method of air conditioner and air conditioner |
| CN105157296B (en) * | 2015-10-20 | 2018-10-19 | 珠海格力电器股份有限公司 | The blower control method and control system of dual system cooling by wind |
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