CN109458776B - Condensing unit operation control method and device and refrigeration equipment with same - Google Patents
Condensing unit operation control method and device and refrigeration equipment with same Download PDFInfo
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- CN109458776B CN109458776B CN201811309161.3A CN201811309161A CN109458776B CN 109458776 B CN109458776 B CN 109458776B CN 201811309161 A CN201811309161 A CN 201811309161A CN 109458776 B CN109458776 B CN 109458776B
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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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
- F25B2600/111—Fan speed control of condenser fans
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- Air Conditioning Control Device (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
The invention provides a method and a device for controlling the operation of a condensing unit and refrigeration equipment with the device. The method comprises the following steps: a pressure ratio detection step, which is used for detecting the pressure ratio of the condensing unit, wherein the pressure ratio of the condensing unit is the ratio of the pressure of an exhaust port of a compressor of the condensing unit to the pressure of an air suction port of the compressor of the condensing unit; and a frequency adjusting step, which is used for adjusting the working frequency of the condensing fan according to the detected pressure ratio change of the condensing unit so as to enable the working frequency of the condensing fan to be adaptive to the detected pressure ratio of the condensing unit. The technical scheme of the invention ensures that the condensing fan is not frequently started and stopped, the system pressure is in a stable state, and the reliability of the whole machine is ensured; the operation mode of the condensing fan can be switched according to the use requirement, and the operation mode is switched to the energy-saving operation mode in the transportation process, so that the energy and the electricity are saved, and the temperature is rapidly reduced to the required temperature; when unloading at the destination, the low-noise operation mode is switched to, the required temperature is maintained, the noise is reduced, and the practicability and the reliability of the unit are improved.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a method and a device for controlling the operation of a condensing unit and refrigeration equipment with the device.
Background
In the prior art, the operation control of the condensing unit generally divides the frequency and the condensing pressure of the fan into a plurality of sections from high to low, adopts the one-to-one correspondence relationship, and when the condensing pressure is in a certain interval, the condensing fan operates according to the fan frequency corresponding to the condensing pressure. For example, the control mode of the condensing fan of the refrigerator car on the market at present is as follows: in the operation process of the unit: when Tc is more than or equal to Tcmax, the condensing fan operates; when Tc is less than Tcmin, the condensing fan is stopped; when Tcmin is less than or equal to Tc and less than Tcmax, the gear of the condensing fan keeps the original state; and if the unit has exhaust pressure sensor faults, the condensing fan is operated all the time. Wherein: tc is the saturation temperature corresponding to the high pressure P of the unit; tcmax is the maximum condensing temperature of the unit; tcmin is the minimum condensing temperature of the unit.
The control scheme in the prior art has the problems that a condensing fan is frequently started and stopped at low ambient temperature, and the reliability of a motor is reduced due to frequent starting and stopping of the fan; and the frequent start and stop of the fan can cause the system pressure to fluctuate frequently, so that the reliability of the whole system is reduced.
Disclosure of Invention
In view of the above, the present invention provides a method for controlling operation of a condensing unit, including: a pressure ratio detection step, which is used for detecting the pressure ratio of the condensing unit, wherein the pressure ratio of the condensing unit is the ratio of the pressure of an exhaust port of a compressor of the condensing unit to the pressure of an air suction port of the compressor of the condensing unit; and a frequency adjusting step, which is used for adjusting the working frequency of the condensing fan according to the detected pressure ratio change of the condensing unit so as to enable the working frequency of the condensing fan to be adaptive to the detected pressure ratio of the condensing unit.
Optionally, the detecting the pressure ratio of the condensing unit includes: detecting the pressure of an exhaust port of a compressor of the condensing unit and the pressure of an air suction port of the compressor of the condensing unit through a high-pressure sensor; and calculating the pressure ratio of the condensing unit according to the detected pressure of the exhaust port of the compressor of the condensing unit and the pressure of the suction port of the compressor of the condensing unit.
Optionally, the frequency adjusting step further comprises an energy saving mode frequency adjusting step, and the energy saving mode frequency adjusting step comprises: adjusting the working frequency of the condensing fan in the nth period to be f (n), f (n-1) + K (Pb-Pbmin); the method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; set f (0) ═ fh.
Optionally, the frequency adjusting step further comprises a low noise mode frequency adjusting step, the low noise mode frequency adjusting step comprising: adjusting the working frequency of the condensing fan in the nth period to be f (n) -f (n-1) -K (Pbmax-Pb); the method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; f (0) ═ fl is set.
Optionally, the method further comprises: if f (n) > fh, adjusting the working frequency of the condensation fan to f (n) ═ fh; if f (n) < fl, the operating frequency of the condensing fan is adjusted to f (n) < fl.
Optionally, the method further comprises: and if Pb is greater than Pbmin, starting the condensing fan.
Optionally, the method further comprises: if the working frequency of the condensing fan in N continuous periods is fl and Pb < Pbmin, stopping the operation of the condensing fan, wherein N is a preset period threshold, and N > is 1.
Optionally, the preset cycle number threshold N is 2.
Optionally, the method further comprises: when the working frequency of the condensing fan is adjusted, the energy-saving mode frequency adjusting step, the low-noise mode frequency adjusting step and the conventional mode frequency adjusting step are selected or switched according to default settings or using requirements; adjusting the working frequency of the condensing fan of the nth period to f (n) ═ fl + K (Tc-Tcmin); wherein K ═ fh-fl ]/(Tcmax-Tcmin); tc is the saturation temperature corresponding to the detected condensing pressure of the condensing unit, Tcmax is the set maximum condensing temperature, and Tcmin is the set minimum condensing temperature; fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, and if f (n) > fh, the working frequency of the condensing fan is adjusted to f (n) ═ fh; if f (n) < fl, adjusting the working frequency of the condensing fan to f (n) < fl; if f (n) is more than 30Hz, starting the condensing fan; and if the working frequency of the condensing fan in two continuous periods is fl and Tc < Tcmin, stopping the operation of the condensing fan.
Another aspect of the present invention further provides a condensing unit operation control apparatus, including: the pressure ratio detection module is used for detecting the pressure ratio of the condensing unit, and the pressure ratio of the condensing unit is the ratio of the pressure of an exhaust port of a compressor of the condensing unit to the pressure of an air suction port of the compressor of the condensing unit; and the frequency adjusting module is used for adjusting the working frequency of the condensing fan according to the detected pressure ratio change of the condensing unit so that the working frequency of the condensing fan is adaptive to the detected pressure ratio of the condensing unit.
Optionally, the pressure ratio detection module includes: the pressure detection unit is used for detecting the pressure of an exhaust port of a compressor of the condensing unit and the pressure of an air suction port of the compressor of the condensing unit through a high-pressure sensor; and the pressure ratio calculating unit is used for calculating the pressure ratio of the condensing unit according to the detected pressure of the exhaust port of the compressor of the condensing unit and the pressure of the suction port of the compressor of the condensing unit.
Optionally, the frequency adjustment module comprises an energy saving mode frequency adjustment unit, configured to: adjusting the working frequency of the condensing fan in the nth period to be f (n), f (n-1) + K (Pb-Pbmin); the method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; set f (0) ═ fh.
Optionally, the frequency adjustment module further comprises a low noise mode frequency adjustment unit for: adjusting the working frequency of the condensing fan of the nth period to
f (n-1) -K (Pbmax-Pb); the method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; f (0) ═ fl is set.
Optionally, further for: if f (n) > fh, adjusting the working frequency of the condensation fan to f (n) ═ fh; if f (n) < fl, the operating frequency of the condensing fan is adjusted to f (n) < fl.
Optionally, further for: and if Pb is greater than Pbmin, starting the condensing fan.
Optionally, further for: if the working frequency of the condensing fan in N continuous periods is fl and Pb < Pbmin, stopping the operation of the condensing fan, wherein N is a preset period threshold, and N > is 1.
Optionally, the preset cycle number threshold N is 2.
Optionally, the system further comprises a selection switching module, configured to: when the working frequency of the condensing fan is adjusted, the energy-saving mode frequency adjusting unit, the low-noise mode frequency adjusting unit and the conventional mode frequency adjusting unit are selected according to default setting or switched according to use requirements; the normal mode frequency adjusting unit is used for adjusting the working frequency of the condensing fan of the nth period to f (n) ═ fl + K (Tc-Tcmin); wherein K ═ fh-fl ]/(Tcmax-Tcmin); tc is the saturation temperature corresponding to the detected condensing pressure of the condensing unit, Tcmax is the set maximum condensing temperature, and Tcmin is the set minimum condensing temperature; fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, and if f (n) > fh, the working frequency of the condensing fan is adjusted to f (n) ═ fh; if f (n) < fl, adjusting the working frequency of the condensing fan to f (n) < fl; if f (n) is more than 30Hz, starting the condensing fan; and if the working frequency of the condensing fan in two continuous periods is fl and Tc < Tcmin, stopping the operation of the condensing fan.
The invention also provides refrigeration equipment which is provided with the condensing unit operation control device.
The technical scheme provided by the invention can timely adjust the working frequency of the condensing fan according to the change of the pressure ratio of the condensing unit, ensure that the condensing fan is not frequently started and stopped, the system pressure is always in a stable state, and ensure the reliability of the whole machine. Meanwhile, the operation mode of the condensing fan of the refrigeration equipment can be switched according to the use requirement in the actual use process. Specifically, when the condensing unit is in a transportation process, the condensing unit is switched to an energy-saving operation mode, the condensing unit is ensured to be operated under high energy efficiency all the time, energy and electricity are saved, meanwhile, the temperature in the box is ensured to be rapidly reduced to the temperature required by a user, and the safety of goods is ensured; when the unit arrives at the destination and prepares for unloading, switch to the low noise mode of operation, when maintaining the required temperature of goods, reduce the unit noise, the staff of being convenient for unloads, this mode switching function has greatly improved unit practicality and reliability when having guaranteed the interior goods safety of storehouse.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is an overall framework diagram of a condensing unit operation control method provided by the invention;
FIG. 2 is a graph comparing pressure with time during operation of a fixed frequency fan and a variable frequency fan;
FIG. 3 is a control flow chart of the operation mode selection switching of the operation control method of the condensing unit provided by the invention;
FIG. 4 is a control flow chart of an energy-saving mode and a low-noise mode of the operation control method of the condensing unit provided by the invention;
FIG. 5 is an overall structure diagram of the operation control device of the condensing unit provided by the invention;
fig. 6 is a schematic structural diagram of a preferred embodiment of the condensing unit operation control device provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a condensing unit operation control method. Fig. 1 is an overall framework diagram of the operation control method of the condensing unit provided by the invention. As shown in fig. 1, the method for controlling the operation of the condensing unit comprises the following steps: a pressure ratio detection step S110, which is used for detecting the pressure ratio of the condensing unit, wherein the pressure ratio of the condensing unit is the ratio of the pressure of an exhaust port of a compressor of the condensing unit to the pressure of an air suction port of the compressor of the condensing unit; and a frequency adjusting step S120, configured to adjust the operating frequency of the condensing fan according to the detected change in the pressure ratio of the condensing unit, so that the operating frequency of the condensing fan is adapted to the detected pressure ratio of the condensing unit. The technical scheme of the invention adjusts the working frequency of the condensing fan of the refrigeration equipment in real time according to the change of the pressure ratio, and can solve the problem that the condensing fan is frequently started and stopped at low ambient temperature and the problem that the system pressure is frequently fluctuated due to the frequent start and stop of the fan. FIG. 2 is a graph comparing pressure with time during operation of a fixed frequency fan and a variable frequency fan. As shown in figure 2, the working frequency of the condensing fan is adjusted in real time, so that the pressure of the variable frequency fan tends to be stable after a period of time, and the reliability of the unit is greatly improved.
Fig. 3 is a control flow chart of the operation mode selection switching of the condensing unit operation control method provided by the invention. Referring to fig. 1 and 3, in step S110, the detecting the pressure ratio of the condensing unit includes: step S111, detecting the pressure of an exhaust port of a compressor of the condensing unit and the pressure of an air suction port of the compressor of the condensing unit through a high-pressure sensor; and step S112, calculating the pressure ratio of the condensing unit according to the detected pressure of the exhaust port of the compressor of the condensing unit and the pressure of the suction port of the compressor of the condensing unit.
Referring to fig. 3 again, according to an embodiment of the method for controlling the operation of the condensing unit, the frequency adjusting step further includes an energy saving mode frequency adjusting step S121, and the energy saving mode frequency adjusting step includes: adjusting the working frequency of the condensing fan in the nth period to be f (n), f (n-1) + K (Pb-Pbmin); the method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; set f (0) ═ fh. The control idea of the energy-saving mode is as follows: the system pressure ratio is as close as possible to the minimum pressure ratio and the fan is operated at the highest frequency as possible. And setting an initial value f (0) ═ fh, namely setting the initial value to be the highest running frequency, and then adjusting the working frequency of the condensing fan in real time according to the change of the pressure ratio of the condensing unit. When the condensing unit operates in the energy-saving mode, the fan operates at the highest frequency under the condition that the fan frequency does not exceed the lowest pressure ratio and the maximum pressure ratio of the compressor, the convection can be accelerated due to the high fan operating frequency, so that the condensing temperature can be lowest, the power is minimum, and the energy efficiency is highest.
Referring again to fig. 3, according to an embodiment of the method for controlling the operation of the condensing unit of the present invention, the frequency adjusting step further includes a low noise mode frequency adjusting step S122, and the low noise mode frequency adjusting step includes: adjusting the working frequency of the condensing fan in the nth period to be f (n) -f (n-1) -K (Pbmax-Pb); the method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; f (0) ═ fl is set. And setting an initial value f (0) fl, namely setting the initial value to be the lowest operating frequency, and then adjusting the operating frequency of the condensing fan in real time according to the change of the pressure ratio of the condensing unit. The idea of low noise mode control is: the system pressure ratio is as close as possible to the maximum pressure ratio, and the fan runs at the lowest frequency as possible, so that the noise can be reduced to the lowest, and the uncomfortable interference caused by the noise is reduced as much as possible.
Referring again to fig. 3, according to an embodiment of the method for controlling the operation of the condensing unit of the present invention, the frequency adjusting step further includes a normal mode frequency adjusting step S123, and the normal mode frequency adjusting step S123 includes: adjusting the working frequency of the condensing fan in the nth period to f (n) ═ fl + K (Tc-Tcmin); wherein K ═ fh-fl ]/(Tcmax-Tcmin); tc is the saturation temperature corresponding to the detected condensing pressure of the condensing unit, Tcmax is the set maximum condensing temperature, and Tcmin is the set minimum condensing temperature; fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, and if f (n) > fh, the working frequency of the condensing fan is adjusted to f (n) ═ fh; if f (n) < fl, adjusting the working frequency of the condensing fan to f (n) < fl; if f (n) is more than 30Hz, starting the condensing fan; and if the working frequency of the condensing fan in two continuous periods is fl and Tc < Tcmin, stopping the operation of the condensing fan.
Referring back to fig. 3, when adjusting the operating frequency of the condensing fan, the energy-saving mode frequency adjusting step S121, the low-noise mode frequency adjusting step S122, and the normal mode frequency adjusting step S123 may be selected according to default settings or switched according to usage requirements. Each of these three modes of operation has advantages and disadvantages: the energy-saving mode mainly considers the problem of energy saving, and the mode saves most energy and does not consider noise; the low noise mode mainly considers the problem of noise reduction, the mode has the lowest noise and does not consider energy saving, and the mode has the least energy saving compared with the other two modes; the conventional mode takes advantages and disadvantages of the two modes into consideration, and is not the most energy-saving mode and the most noise-causing mode. The user can switch between the energy-saving mode, the low-noise mode and the conventional mode according to specific use requirements in the use process. Specifically, when the unit is in a transportation process, the mode is switched to the highest energy efficiency mode, the unit is ensured to be operated under high energy efficiency all the time, energy and electricity are saved, meanwhile, the temperature in the box is ensured to be rapidly reduced to the temperature required by a user, and the safety of goods is ensured; when the unit arrives at the destination and prepares to unload, the unit switches to the low-noise operation mode, reduces the noise of the unit while maintaining the required temperature of the goods, is convenient for the staff to unload, and greatly improves the practicability and the reliability of the unit while ensuring the safety of the goods in the warehouse by the mode switching function.
Fig. 4 is a control flow chart of an energy-saving mode and a low-noise mode of the operation control method of the condensing unit provided by the invention. The two modes are to adjust the working frequency of the condensing fan according to the change of the pressure ratio of the condensing unit, as shown in fig. 4, in the control flow, step S310 is executed to detect the pressure ratio Pb first, then step S320 is executed to determine whether Pb > Pbmin, if yes, step S330 is executed to turn on the condensing fan, otherwise, step S310 is executed to detect the pressure ratio Pb after a preset time, and the shorter the preset time is, the stronger the real-time performance of the system control is.
As shown in fig. 4, after the condensing fan is turned on in step S330, step S340 is executed to calculate an operating frequency f (n) according to a formula of the operating mode of the system, and as mentioned above, the formula of the energy saving mode frequency calculation is f (n) ═ f (n-1) + K (Pb-Pbmin); the formula for the low noise mode frequency calculation is f (n) ═ f (n-1) -K (Pbmax-Pb). The working mode can be selected according to default settings of the system or switched according to the use requirements of users.
As shown in fig. 4, after calculating the value of the operating frequency f (n) in step S340, if f (n) > fh, step S350 is executed to adjust the operating frequency of the condensing fan to f (n) > fh; if f (n) < fl, performing step S360 to adjust the operating frequency of the condensing fan to f (n) < fl; if fl is less than or equal to f (n) is less than or equal to fh, executing step S370 to adjust the working frequency according to the calculation result of the formula. After steps S350, S360 and S370, step S380 is performed to operate the condensing fan for one cycle at the adjusted frequency.
As shown in fig. 4, after the condensing fan operates for one cycle according to the adjusted frequency in steps S350 and S380, step S390 is executed to determine whether the operating frequency of the condensing fan is fl for N consecutive cycles and Pb < Pbmin, if so, step S395 is executed to stop the operation of the condensing fan, where N is a preset cycle threshold, N > 1, (preferably, N is 2). Step S395 detects the pressure ratio Pb after the operation of the condensing fan is stopped and returns to step S310 after the start, and the above steps are repeatedly performed.
In the other two cases, after the condensing fan runs for one period according to the adjusted frequency in the steps S360, S370 and S380, the step S310 is executed to detect the pressure ratio Pb again, the step S340 is returned to calculate the working frequency f (n) according to the formula, and the steps are repeatedly executed.
In two operation modes of an energy-saving mode and a low-noise operation mode, the time length of each period can be reasonably set according to actual requirements, and the shorter the set time is, the stronger the real-time property of system adjustment is.
The invention further provides a condensing unit operation control device. Fig. 5 is an overall configuration diagram of the operation control device of the condensing unit according to the present invention. As shown in fig. 5, the operation control device of the condensing unit of the present invention includes: the pressure ratio detection module 100 is used for detecting the pressure ratio of the condensing unit, wherein the pressure ratio of the condensing unit is the ratio of the pressure of an exhaust port of a compressor of the condensing unit to the pressure of an air suction port of the compressor of the condensing unit; and the frequency adjusting module 200 is configured to adjust the working frequency of the condensing fan according to the detected change of the pressure ratio of the condensing unit, so that the working frequency of the condensing fan is adapted to the detected pressure ratio of the condensing unit.
Fig. 6 is a schematic structural diagram of a preferred embodiment of the condensing unit operation control device provided by the invention. As shown in fig. 6, according to an embodiment of the condensation unit operation control apparatus of the present invention, the pressure ratio detection module 100 includes: a pressure detection unit 110, configured to detect, through a high-pressure sensor, an exhaust pressure of the condensing unit compressor and an air suction pressure of the condensing unit compressor; and a pressure ratio calculating unit 120, configured to calculate a pressure ratio of the condensing unit according to the detected pressure at the exhaust port of the compressor of the condensing unit and the pressure at the suction port of the compressor of the condensing unit.
Referring to fig. 5 and 6, according to an embodiment of the condensing unit operation control apparatus of the present invention, the frequency adjustment module 200 further includes an energy-saving mode frequency adjustment unit 210 for: adjusting the working frequency of the condensing fan in the nth period to be f (n), f (n-1) + K (Pb-Pbmin); the method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; set f (0) ═ fh.
Referring to fig. 5 and 6, according to an embodiment of the condensation unit operation control apparatus of the present invention, the frequency adjustment module 200 further includes a low noise mode frequency adjustment unit 220 for: adjusting the working frequency of the condensing fan in the nth period to be f (n) -f (n-1) -K (Pbmax-Pb); the method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; f (0) ═ fl is set.
According to an embodiment of the condensation unit operation control device, the frequency adjustment module 200 is further configured to: if f (n) > fh, adjusting the working frequency of the condensation fan to f (n) ═ fh; if f (n) < fl, the operating frequency of the condensing fan is adjusted to f (n) < fl.
According to an embodiment of the condensation unit operation control device, the frequency adjustment module 200 is further configured to: and if Pb is greater than Pbmin, starting the condensing fan.
According to an embodiment of the condensation unit operation control device, the frequency adjustment module 200 is further configured to: if the working frequency of the condensing fan in N continuous periods is fl and Pb < Pbmin, stopping the operation of the condensing fan, wherein N is a preset period threshold, and N > is 1.
According to an embodiment of the condensation unit operation control device, the preset cycle number threshold N is 2.
As shown in fig. 6, an embodiment of the condensing unit operation control apparatus according to the present invention further includes a selection switching module 300, configured to: when the working frequency of the condensing fan is adjusted, the energy-saving mode frequency adjusting unit 210, the low-noise mode frequency adjusting unit 220 and the normal mode frequency adjusting unit 230 are selected according to default settings or switched according to use requirements; the conventional mode frequency adjusting unit 230 is configured to adjust an operating frequency of the condensing fan of the nth cycle to f (n) ═ fl + K (Tc-Tcmin); wherein K ═ fh-fl ]/(Tcmax-Tcmin); tc is the saturation temperature corresponding to the detected condensing pressure of the condensing unit, Tcmax is the set maximum condensing temperature, and Tcmin is the set minimum condensing temperature; fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, and if f (n) > fh, the working frequency of the condensing fan is adjusted to f (n) ═ fh; if f (n) < fl, adjusting the working frequency of the condensing fan to f (n) < fl; if f (n) is more than 30Hz, starting the condensing fan; and if the working frequency of the condensing fan in two continuous periods is fl and Tc < Tcmin, stopping the operation of the condensing fan.
The invention also provides refrigeration equipment which is provided with the condensing unit operation control device.
The technical scheme provided by the invention can timely adjust the working frequency of the condensing fan according to the change of the pressure ratio of the condensing unit, ensure that the condensing fan is not frequently started and stopped, the system pressure is always in a stable state, and ensure the reliability of the whole machine. Meanwhile, the operation mode of the condensing fan of the refrigeration equipment can be switched according to the use requirement in the actual use process. Specifically, when the condensing unit is in a transportation process, the condensing unit is switched to an energy-saving operation mode, the condensing unit is ensured to be operated under high energy efficiency all the time, energy and electricity are saved, meanwhile, the temperature in the box is ensured to be rapidly reduced to the temperature required by a user, and the safety of goods is ensured; when the unit arrives at the destination and prepares for unloading, switch to the low noise mode of operation, when maintaining the required temperature of goods, reduce the unit noise, the staff of being convenient for unloads, this mode switching function has greatly improved unit practicality and reliability when having guaranteed the interior goods safety of storehouse.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the following claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and the parts serving as the control device may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. A method for controlling the operation of a condensing unit is characterized by comprising the following steps:
a pressure ratio detection step, which is used for detecting the pressure ratio of the condensing unit, wherein the pressure ratio of the condensing unit is the ratio of the pressure of an exhaust port of a compressor of the condensing unit to the pressure of an air suction port of the compressor of the condensing unit;
a frequency adjusting step, which is used for adjusting the working frequency of a condensing fan according to the detected pressure ratio change of the condensing unit so as to enable the working frequency of the condensing fan to be adaptive to the detected pressure ratio of the condensing unit;
the frequency adjusting step further comprises an energy saving mode frequency adjusting step, the energy saving mode frequency adjusting step comprising:
adjusting the working frequency of the condensing fan of the nth period to
f(n)＝f(n-1)+K*(Pb-Pbmin)；
The method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; setting f (0) to fh; alternatively, the first and second electrodes may be,
the frequency adjusting step further comprises a low noise mode frequency adjusting step, the low noise mode frequency adjusting step comprising:
adjusting the working frequency of the condensing fan of the nth period to
f(n)＝f(n-1)-K*(Pbmax-Pb)；
The method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; setting f (0) to fl;
when the working frequency of the condensing fan is adjusted, the energy-saving mode frequency adjusting step, the low-noise mode frequency adjusting step and the conventional mode frequency adjusting step are selected or switched according to default settings or using requirements;
adjusting the working frequency of the condensing fan of the nth period to f (n) ═ fl + K (Tc-Tcmin); wherein K ═ fh-fl ]/(Tcmax-Tcmin); tc is the saturation temperature corresponding to the detected condensing pressure of the condensing unit, Tcmax is the set maximum condensing temperature, and Tcmin is the set minimum condensing temperature; fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, and if f (n) > fh, the working frequency of the condensing fan is adjusted to f (n) ═ fh; if f (n) < fl, adjusting the working frequency of the condensing fan to f (n) < fl; if f (n) is more than 30Hz, starting the condensing fan; if the working frequency of the condensing fan in two continuous periods is fl and Tc < Tcmin, stopping the operation of the condensing fan; the pressure ratio of the condensation unit is detected by the following steps:
detecting the pressure of an exhaust port of a compressor of the condensing unit and the pressure of an air suction port of the compressor of the condensing unit through a high-pressure sensor;
calculating the pressure ratio of the condensing unit according to the detected pressure of the exhaust port of the compressor of the condensing unit and the pressure of the suction port of the compressor of the condensing unit;
further comprising:
if f (n) > fh, adjusting the working frequency of the condensation fan to f (n) ═ fh;
if f (n) < fl, the operating frequency of the condensing fan is adjusted to f (n) < fl.
2. The method of claim 1, further comprising: and if Pb is greater than Pbmin, starting the condensing fan.
3. The method of claim 1, further comprising: if the working frequency of the condensing fan in N continuous periods is fl and Pb < Pbmin, stopping the operation of the condensing fan, wherein N is a preset period threshold, and N > is 1.
4. The method according to claim 3, wherein the preset threshold number of cycles N is 2.
5. A condensing unit operation control device is characterized by comprising:
the pressure ratio detection module is used for detecting the pressure ratio of the condensing unit, and the pressure ratio of the condensing unit is the ratio of the pressure of an exhaust port of a compressor of the condensing unit to the pressure of an air suction port of the compressor of the condensing unit;
the frequency adjusting module is used for adjusting the working frequency of the condensing fan according to the detected pressure ratio change of the condensing unit so that the working frequency of the condensing fan is adaptive to the detected pressure ratio of the condensing unit;
the frequency adjustment module comprises an energy-saving mode frequency adjustment unit for:
adjusting the working frequency of the condensing fan of the nth period to
f(n)＝f(n-1)+K*(Pb-Pbmin)；
The method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; setting f (0) to fh;
the frequency adjustment module further comprises a low noise mode frequency adjustment unit for:
adjusting the working frequency of the condensing fan of the nth period to
f(n)＝f(n-1)-K*(Pbmax-Pb)；
The method comprises the following steps that K is [ fh-fl ]/(Pbmax-Pbmin), Pb is the detected pressure ratio of the condensing unit, fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, Pbmin is the set lowest operation pressure ratio of the condensing unit, and Pbmax is the set maximum operation pressure ratio of the condensing unit; n > is 1; setting f (0) to fl;
the system further comprises a selection switching module used for: when the working frequency of the condensing fan is adjusted, the energy-saving mode frequency adjusting unit, the low-noise mode frequency adjusting unit and the conventional mode frequency adjusting unit are selected according to default setting or switched according to use requirements;
the normal mode frequency adjusting unit is used for adjusting the working frequency of the condensing fan of the nth period to f (n) ═ fl + K (Tc-Tcmin); wherein K ═ fh-fl ]/(Tcmax-Tcmin); tc is the saturation temperature corresponding to the detected condensing pressure of the condensing unit, Tcmax is the set maximum condensing temperature, and Tcmin is the set minimum condensing temperature; fl is the set lowest operation frequency of the condensing fan, fh is the set highest operation frequency of the condensing fan, and if f (n) > fh, the working frequency of the condensing fan is adjusted to f (n) ═ fh; if f (n) < fl, adjusting the working frequency of the condensing fan to f (n) < fl; if f (n) is more than 30Hz, starting the condensing fan; if the working frequency of the condensing fan in two continuous periods is fl and Tc < Tcmin, stopping the operation of the condensing fan;
the pressure ratio detection module includes:
the pressure detection unit is used for detecting the pressure of an exhaust port of a compressor of the condensing unit and the pressure of an air suction port of the compressor of the condensing unit through a high-pressure sensor;
the pressure ratio calculating unit is used for calculating the pressure ratio of the condensing unit according to the detected pressure of the exhaust port of the compressor of the condensing unit and the pressure of the suction port of the compressor of the condensing unit;
and is also used for:
if f (n) > fh, adjusting the working frequency of the condensation fan to f (n) ═ fh;
if f (n) < fl, the operating frequency of the condensing fan is adjusted to f (n) < fl.
6. The apparatus of claim 5, further configured to: and if Pb is greater than Pbmin, starting the condensing fan.
7. The apparatus of claim 5, further configured to: if the working frequency of the condensing fan in N continuous periods is fl and Pb < Pbmin, stopping the operation of the condensing fan, wherein N is a preset period threshold, and N > is 1.
8. The apparatus according to claim 7, wherein the preset threshold N-2.
9. A refrigeration apparatus having a condensing unit operation control device as claimed in any one of claims 5 to 8.
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| CN109458776B (en) * | 2016-10-18 | 2021-03-23 | 珠海格力电器股份有限公司 | Condensing unit operation control method and device and refrigeration equipment with same |
| CN107238180B (en) * | 2017-06-23 | 2020-07-07 | 特灵空调系统(中国)有限公司 | Air quantity control method and system of air-cooled water chilling unit |
| CN107238240B (en) * | 2017-06-29 | 2020-05-08 | 重庆美的通用制冷设备有限公司 | Air-cooled water chilling unit and control method and device of fan of air-cooled water chilling unit |
| CN107461970B (en) * | 2017-07-19 | 2021-09-21 | 青岛海尔空调电子有限公司 | Control method of water chilling unit with evaporative condenser |
| 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 |
| CN109253521B (en) * | 2018-09-30 | 2019-12-24 | 珠海格力电器股份有限公司 | Noise control method, device and system, air conditioner and computer readable storage medium |
| CN109899289B (en) * | 2019-04-23 | 2020-05-22 | 西安交通大学 | Double-motor-driven double-rolling piston compressor structure and control method thereof |
| CN111520894B (en) * | 2020-07-03 | 2020-11-27 | 宁波奥克斯电气股份有限公司 | Output control method and device for air conditioner compressor, air conditioner and storage medium |
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