CN113203238B - Refrigerating unit control method and device and refrigerating unit - Google Patents
Refrigerating unit control method and device and refrigerating unit Download PDFInfo
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- CN113203238B CN113203238B CN202110471591.0A CN202110471591A CN113203238B CN 113203238 B CN113203238 B CN 113203238B CN 202110471591 A CN202110471591 A CN 202110471591A CN 113203238 B CN113203238 B CN 113203238B
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D13/00—Stationary devices, e.g. cold-rooms
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The invention discloses a refrigerating unit control method, a refrigerating unit control device and a refrigerating unit, and relates to the technical field of refrigerating equipment, wherein the refrigerating unit control method comprises the following steps: monitoring the outdoor environment temperature to obtain the indoor set temperature in the refrigerating operation process of the refrigerating unit; determining a target low-pressure temperature of the refrigerating unit based on the outdoor environment temperature and the indoor set temperature; the compressor operating frequency of the refrigeration unit is controlled based on the target low pressure temperature. The invention can adjust the frequency of the compressor of the refrigerating unit according to the change condition of the target low-pressure temperature, avoids controlling the refrigerating unit to be started and stopped frequently, and improves the accuracy and the reliability of the control of the refrigerating unit.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration unit control method and device and a refrigeration unit.
Background
Currently, in the freezing and refrigerating industry, the refrigeration system adopted by a refrigeration unit such as a refrigerator unit or a freezer generally uses a single refrigeration unit (a fixed-frequency compressor, a target low-pressure temperature fixed value) to control a single refrigerator/freezer. When the set temperature in the freezer chamber changes, the load demand has changed. However, the unit adopts a fixed frequency machine, the target low-pressure temperature is fixed, the refrigerating unit still runs to the temperature at the maximum power, the control accuracy is poor, a large amount of energy is wasted, the compressor is frequently started and stopped due to frequent shutdown at the temperature, and the control reliability of the refrigerating unit is poor.
Disclosure of Invention
In order to solve the problems, the invention provides a refrigerating unit control method and device and a refrigerating unit, which can adjust the frequency of a compressor of the refrigerating unit according to the change condition of target low-pressure temperature, avoid controlling the refrigerating unit to be started and stopped frequently, and improve the control accuracy and reliability of the refrigerating unit.
According to an embodiment of the present invention, in one aspect, a method for controlling a refrigeration unit is provided, including: monitoring the outdoor environment temperature to obtain the indoor set temperature in the refrigerating operation process of the refrigerating unit; determining a target low-pressure temperature of the refrigeration unit based on the outdoor ambient temperature and the indoor set temperature; controlling a compressor operating frequency of the refrigeration unit based on the target low pressure temperature.
By adopting the technical scheme, the refrigerating unit can be ensured to output enough cold energy at the current outdoor environment temperature, the compressor frequency of the refrigerating unit is adjusted according to the change condition of the target low-pressure temperature, the frequent start and stop of the refrigerating unit are prevented from being controlled, and the control accuracy and reliability of the refrigerating unit are improved.
Preferably, the step of controlling the operating frequency of the compressor of the refrigeration unit based on the target low-pressure temperature includes: monitoring an actual low pressure temperature of the refrigeration unit; and periodically controlling the running frequency of the compressor of the refrigerating unit based on the actual low-pressure temperature and the target low-pressure temperature.
By adopting the technical scheme, the actual operation load of the refrigerating unit can be obtained, the operation frequency of the compressor of the refrigerating unit can be periodically controlled according to the actual operation load and the target low-pressure temperature of the refrigerating unit, the operation load of the refrigerating unit can be periodically detected, the refrigerating unit can meet the refrigerating capacity requirement under different operation loads, and the self-adaptive refrigerating capacity of the refrigerating unit and the accuracy of refrigerating control are improved.
Preferably, the step of periodically controlling the operating frequency of the compressor of the refrigeration unit based on the actual low-pressure temperature and the target low-pressure temperature includes: acquiring the current compressor frequency of the refrigerating unit every preset time, and judging whether the actual low-pressure temperature is greater than the target low-pressure temperature; when the actual low-pressure temperature is higher than the target low-pressure temperature, controlling the current compressor frequency of the refrigerating unit to increase by a first preset frequency; wherein the first preset frequency is associated with a current compressor frequency of the refrigeration unit.
By adopting the technical scheme, when the actual low-pressure temperature of the refrigerating unit is greater than the target low-pressure temperature, the operation frequency of the compressor of the refrigerating unit is controlled to be increased, the refrigerating capacity of the refrigerating unit can be improved, the actual low-pressure temperature of the refrigerating unit is reduced to the target low-pressure temperature, and the refrigerating requirement of the refrigeration house is met.
Preferably, the refrigeration unit control method further includes: and when the actual low-pressure temperature is equal to the target low-pressure temperature, controlling the refrigerating unit to maintain the current compressor frequency to operate.
By adopting the technical scheme, when the actual low-pressure temperature of the refrigerating unit reaches the target low-pressure temperature, the refrigerating unit is controlled to maintain the current compressor frequency to operate, the frequent start and stop control on the refrigerating unit is avoided on the basis of reducing the power consumption of the refrigerating unit as far as possible, and the operation stability of the refrigerating unit is improved.
Preferably, the refrigeration unit control method further includes: when the actual low-pressure temperature is lower than the target low-pressure temperature, controlling the current compressor frequency of the refrigerating unit to reduce a second preset frequency; wherein the second predetermined frequency is related to a current operating frequency of the refrigeration unit compressor.
By adopting the technical scheme, when the actual low-pressure temperature of the refrigerating unit is less than the target low-pressure temperature, the running frequency of the compressor of the refrigerating unit is controlled to be reduced, the refrigerating capacity of the refrigerating unit can be reduced, the actual low-pressure temperature of the refrigerating unit is gradually increased to the target low-pressure temperature, the indoor environment temperature of the refrigeration house reaches the indoor set temperature, the requirement of the indoor refrigerating temperature is met, the energy consumption of the refrigerating unit is reduced, and the electricity consumption of the refrigerating unit is saved.
Preferably, the step of determining the target low-pressure temperature of the refrigeration unit based on the outdoor ambient temperature and the indoor set temperature includes: inputting the outdoor environment temperature and the indoor set temperature into a preset calculation formula at intervals of preset time to obtain the target low-pressure temperature; wherein the preset calculation formula is as follows: teo + Tai + Tao2+ B x Tao-C; tao is theOutdoor ambient temperature, Teo the target low pressure temperature, Tai the indoor set temperature, A, B and C are both constants.
By adopting the technical scheme, when the operation load of the refrigerating unit changes, the target low-pressure temperature of the refrigerating unit can be periodically and accurately calculated in real time according to the outdoor environment temperature and the outdoor set temperature, the variability of the target low-pressure temperature is realized, the refrigerating output can be automatically adjusted and controlled according to the calculated target low-pressure temperature, and the refrigerating effect of the refrigerating unit is ensured.
Preferably, the first preset frequency is the current compressor frequency D1%, the second preset frequency is the current compressor frequency D2%, and the value ranges of D1% and D2% are both 0-10%.
By adopting the technical scheme, the frequency increasing of the compressor of the refrigerating unit is set to be the current compressor frequency D1 every time, the frequency reducing of the compressor of the refrigerating unit is set to be the current compressor frequency D2 every time, not only can the refrigerating requirement that the refrigerating unit is close to the target low-pressure temperature be met, but also the refrigerating output of the refrigerating unit can be ensured not to be too large or too small, so that the actual low-pressure temperature of the refrigerating unit can be accurately controlled, and the reliability of refrigerating control of the refrigerating unit is improved.
According to an embodiment of the present invention, in another aspect, there is provided a refrigeration unit control apparatus including: the temperature monitoring module is used for monitoring the outdoor environment temperature and acquiring the indoor set temperature in the refrigerating operation process of the refrigerating unit; the temperature determining module is used for determining the target low-pressure temperature of the refrigerating unit based on the outdoor environment temperature and the indoor set temperature; and the frequency control module is used for controlling the running frequency of the compressor of the refrigerating unit based on the target low-pressure temperature.
According to an embodiment of the present invention, there is provided a refrigeration unit including a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method according to any one of the first aspect.
According to an embodiment of the present invention, in another aspect, a computer-readable storage medium is provided, which stores a computer program, which when read and executed by a processor, implements the method according to any one of the first aspect.
The invention has the following beneficial effects: the target low-pressure temperature of the refrigerating unit is determined according to the monitored outdoor environment temperature and the indoor set temperature, so that the refrigerating unit can be ensured to output enough cold energy under the current outdoor environment temperature, the running frequency of the compressor of the refrigerating unit is controlled according to the target low-pressure temperature, the frequency of the compressor of the refrigerating unit can be adjusted according to the change condition of the target low-pressure temperature, the frequent starting and stopping of the refrigerating unit are avoided, and the control accuracy and reliability of the refrigerating unit are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a flowchart of a control method of a refrigeration unit according to the present invention;
FIG. 2 is a logic diagram of a frequency conversion control of a refrigerating unit according to the present invention;
fig. 3 is a schematic structural diagram of a refrigeration unit control device provided by the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The first embodiment is as follows:
the present embodiment provides a method for controlling a refrigeration unit, which may be applied to a controller of the refrigeration unit, and referring to a flowchart of a method for controlling a refrigeration unit shown in fig. 1, the method mainly includes the following steps S102 to S106:
step S102: in the refrigerating operation process of the refrigerating unit, the outdoor environment temperature is monitored, and the indoor set temperature of the refrigerating unit is obtained.
When the refrigerating unit is in a stable refrigerating operation process, when the refrigerating unit enters a stable refrigerating state, namely when the refrigerating unit is started to operate for a period of time (the time length can be determined according to the rated operation power of the refrigerating unit, such as 10-30 min), the outdoor environment temperature is detected in real time based on a temperature sensor in an outdoor unit of the refrigerating unit, and the temperature sensor is in communication connection with a controller of the refrigerating unit and sends the detected outdoor environment temperature to the controller in real time. And acquiring the indoor set temperature of the refrigeration house, wherein the indoor set temperature can be input by a user through a remote controller or a control panel and is stored in a controller of the refrigeration unit.
Step S104: and determining the target low-pressure temperature of the refrigerating unit based on the outdoor environment temperature and the indoor set temperature.
When the refrigerating unit is operated for refrigeration, different target low-pressure temperatures can be accurately set according to different outdoor environment temperatures and indoor set temperatures in a refrigerator, namely, the target low-pressure temperature is determined according to the operation load of the refrigerating unit, the refrigerating output of the refrigerating unit is different under different target low-pressure temperatures and operation loads, the target low-pressure temperature is set according to the outdoor environment temperature and the indoor set temperature of the refrigerating unit so as to ensure that the refrigerating output of the refrigerating unit is sufficient,
step S106: the compressor operating frequency of the refrigeration unit is controlled based on the target low pressure temperature.
The running frequency of the compressor of the refrigerating unit is controlled according to the target low-pressure temperature set by the refrigerating unit, so that the low-pressure temperature of the refrigerating unit is gradually close to the target low-pressure temperature, namely when the target low-pressure temperature of the refrigerating unit changes, the compressor of the refrigerating unit is controlled to correspondingly change, for example, when the target low-pressure temperature is reduced, the refrigerating unit needs more refrigerating capacity, the frequency of the compressor of the refrigerating unit is controlled to correspondingly increase, when the target low-pressure temperature is increased, the refrigerating unit needs to increase the temperature in a cold storage, and in order to save the power consumption of the refrigerating unit, the frequency of the compressor of the refrigerating unit is controlled to correspondingly decrease.
In practical applications, the steps S104 to S106 may be periodically and repeatedly executed until the target low-pressure temperature set by the refrigeration unit is reached, so as to improve the control accuracy of the refrigeration unit.
According to the control method of the refrigerating unit, the target low-pressure temperature of the refrigerating unit is determined according to the monitored outdoor environment temperature and the indoor set temperature, the refrigerating unit can be guaranteed to output enough cold energy under the current outdoor environment temperature, the running frequency of the compressor of the refrigerating unit is controlled according to the target low-pressure temperature, the frequency of the compressor of the refrigerating unit can be adjusted according to the change condition of the target low-pressure temperature, the refrigerating unit is prevented from being controlled to be started and stopped frequently, and the control accuracy and reliability of the refrigerating unit are improved.
In order to ensure that the cooling capacity of the refrigeration unit meets the cooling requirement of the indoor set temperature and improve the reliability of the control of the refrigeration unit, the embodiment provides an implementation manner for controlling the operation frequency of the compressor of the refrigeration unit based on the target low-pressure temperature, and the implementation manner can be specifically executed by referring to the following steps (1) to (2):
step (1): the actual low pressure temperature of the refrigeration unit is monitored.
The method comprises the steps of detecting actual low-pressure temperature in a refrigerating operation process of the refrigerating unit in real time based on a temperature sensor arranged in the refrigerating unit, and sending the detected actual low-pressure temperature of the refrigerating unit to a controller of the refrigerating unit in real time.
Step (2): and periodically controlling the running frequency of the compressor of the refrigerating unit based on the actual low-pressure temperature and the target low-pressure temperature.
The actual low-pressure temperature and the target low-pressure temperature of the refrigerating unit are obtained at preset intervals, and the operation frequency of a compressor of the refrigerating unit is controlled according to the magnitude relation between the actual low-pressure temperature and the target low-pressure temperature of the refrigerating unit, so that the actual low-pressure temperature of the refrigerating unit is gradually close to the target low-pressure temperature set by the refrigerating unit, the indoor environment temperature of the refrigeration house reaches the indoor set temperature, and the refrigeration requirement of the refrigeration house is met.
The actual operation load of the refrigerating unit can be obtained by acquiring the actual low-pressure temperature of the refrigerating unit, the operation frequency of a compressor of the refrigerating unit is periodically controlled according to the actual operation load and the target low-pressure temperature of the refrigerating unit, the operation load of the refrigerating unit can be periodically detected, the refrigerating unit can meet the refrigerating capacity requirement under different operation loads, and the self-adaptive refrigerating capacity of the refrigerating unit and the accuracy of refrigerating control are improved.
In order to implement accurate control on the refrigeration unit, the embodiment provides an implementation manner that the operation frequency of the compressor of the refrigeration unit is periodically controlled based on the actual low-pressure temperature and the target low-pressure temperature, and the following steps 1) to 3) may be specifically referred to:
step 1): acquiring the current compressor frequency of the refrigerating unit every preset time interval, and judging whether the actual low-pressure temperature is greater than the target low-pressure temperature or not; when the actual low-pressure temperature is higher than the target low-pressure temperature, controlling the current compressor frequency of the refrigerating unit to increase by a first preset frequency; wherein the first predetermined frequency is associated with a current compressor frequency of the refrigeration unit.
The preset time is a compressor control period of the refrigerating unit, in order to avoid frequent rising and falling of the compressor frequency and guarantee that the compressor frequency meets the refrigerating requirement of the refrigeration house, the value range of the preset time can be 2-10 min.
Acquiring the actual low-pressure temperature, the target low-pressure temperature and the current compressor frequency of the refrigerating unit at preset intervals, and controlling the current compressor frequency f of the refrigerating unit when the actual low-pressure temperature Te of the refrigerating unit is greater than the target low-pressure temperature Teo, namely Te is greater than Teo(n-1)(i.e., the compressor operating frequency of the refrigeration unit at the end of the (n-1) th cycle is f(n-1)) Increasing a first predetermined frequency, which may be f(n-1)D1%, D1% may range from 0 to 10%, preferably 5%. I.e. controlling the compressor operating frequency of the refrigerating unit from the current compressor frequency f(n-1)Increase to f(n)＝f(n-1)(1+ D1%), the compressor of the refrigeration unit operating at f during the next cycle n(n-1)(1+ D1%) was run.
By periodically judging the relation between the actual low-pressure temperature and the target low-pressure temperature, when the actual low-pressure temperature of the refrigerating unit is higher than the target low-pressure temperature, the operation frequency of a compressor of the refrigerating unit is controlled to be increased, the refrigerating capacity of the refrigerating unit can be increased, the actual low-pressure temperature of the refrigerating unit is reduced to the target low-pressure temperature, and the refrigerating requirement of a refrigeration house is met.
Step 2): and when the actual low-pressure temperature is equal to the target low-pressure temperature, controlling the refrigerating unit to maintain the current compressor frequency to operate.
When the actual low-pressure temperature Te of the refrigerating unit is equal to the target low-pressure temperature Teo, namely Te is equal to Teo, controlling the compressor of the refrigerating unit to maintain the current compressor frequency to operate, namely controlling the compressor frequency f of the refrigerating unit(n)＝f(n-1)。
When the actual low-pressure temperature of the refrigerating unit reaches the target low-pressure temperature, the refrigerating unit is controlled to maintain the current compressor frequency to operate, on the basis of reducing the power consumption of the refrigerating unit as much as possible, the frequent start and stop control of the refrigerating unit is avoided, and the operation stability of the refrigerating unit is improved.
And step 3): when the actual low-pressure temperature is lower than the target low-pressure temperature, controlling the current compressor frequency of the refrigerating unit to reduce a second preset frequency; wherein the second predetermined frequency is associated with a current operating frequency of the refrigeration unit compressor.
When the actual low-pressure temperature Te of the refrigerating unit is less than the target low-pressure temperature Teo, namely Te<Control of the current compressor frequency f of the refrigerating unit at Teo(n-1)(i.e., the compressor operating frequency of the refrigeration unit at the end of the (n-1) th cycle is f(n-1)) Reducing a second predetermined frequency, which may be f(n-1)D2%, D2% may be in the range of 0-10%, preferably 5%, and the first preset frequency and the second preset frequency may be the same or different. I.e. controlling the compressor operating frequency of the refrigerating unit from the current compressor frequency f(n-1)Is reduced to f(n)＝f(n-1)(1-D2%) the compressor of the refrigeration unit is operated at f during the next cycle n(n-1)(1-D2%).
When the actual low-pressure temperature of the refrigerating unit is lower than the target low-pressure temperature, the running frequency of a compressor of the refrigerating unit is controlled to be reduced, the refrigerating capacity of the refrigerating unit can be reduced, the actual low-pressure temperature of the refrigerating unit is gradually increased to the target low-pressure temperature, the indoor environment temperature of the refrigeration house reaches the indoor set temperature, the requirement of the indoor refrigerating temperature is met, the energy consumption of the refrigerating unit is reduced, and the power consumption of the refrigerating unit is saved.
The frequency increasing of the compressor of the refrigerating unit at each time is set to be the current compressor frequency D1%, the frequency reducing of the compressor of the refrigerating unit at each time is set to be the current compressor frequency D2%, not only can the refrigerating demand that the refrigerating unit is close to the target low-pressure temperature be met, but also the refrigerating output of the refrigerating unit can be guaranteed not to be too large or too small, so that the actual low-pressure temperature of the refrigerating unit can be accurately controlled, and the reliability of refrigerating control of the refrigerating unit is improved.
In order to accurately set the target low-pressure temperature of the refrigeration unit, the embodiment provides a specific implementation manner for determining the target low-pressure temperature of the refrigeration unit based on the outdoor environment temperature and the indoor set temperature: inputting the outdoor environment temperature and the indoor set temperature into a preset calculation formula at preset time intervals to obtain a target low-pressure temperature, wherein the preset calculation formula is as follows:
Teo＝Tai+A*Tao2+B*Tao-C
tao is the outdoor ambient temperature, Teo is the target low pressure temperature, Tai is the indoor set temperature, A, B and C are constants. The value range of the constant A can be 0.0001-0.001, and the preferred value is 0.0008; the value range of the constant B can be 0.20-0.25, and the preferred value is 0.23; the value range of C can be 5-20, and the preferred value is 15. And after the target low-pressure temperature is calculated every preset time, controlling the frequency of the compressor of the refrigerating unit according to the calculated target low-pressure temperature. The target low-pressure temperature calculated by the preset calculation formula can ensure that the refrigerating output of the refrigerating unit meets the refrigerating requirement under the current operating load of the outdoor environment temperature and the indoor set temperature, and the temperature in the cold storage can quickly reach the indoor set temperature.
Based on the preset calculation formula, when the running load of the refrigerating unit changes, the target low-pressure temperature of the refrigerating unit can be periodically calculated in real time and accurately according to the outdoor environment temperature and the outdoor set temperature, the variability of the target low-pressure temperature is realized, the refrigerating output can be automatically adjusted and controlled according to the calculated target low-pressure temperature, and the refrigerating effect of the refrigerating unit is ensured.
According to the control method of the refrigerating unit, when the refrigerating unit operates in a refrigerating mode, different target low-pressure temperatures can be automatically and accurately set (namely, the target low-pressure temperature is determined according to the load) according to different outdoor environment temperatures and indoor set temperatures of the refrigeration house, the target low pressure can ensure that the cold output of the refrigeration house is enough, and the frequency of the compressor is adjusted through the difference value of the target low-pressure temperature and the actual low-pressure temperature, so that the refrigerating output of the refrigeration house is adjusted, the self-adaptive frequency conversion adjustment of the refrigerating unit is realized, and the stability and the reliability of the self-adaptive control of the refrigerating unit are improved.
The second embodiment:
corresponding to the first refrigeration unit control method provided in the foregoing embodiment, an embodiment of the present invention provides an example of performing variable frequency control on a target low voltage of a refrigeration unit by using the above refrigeration unit control method, which can be specifically executed by referring to the following steps 1 to 5:
step 1: and acquiring the current outdoor environment temperature and the indoor set temperature, and calculating the target low-pressure temperature Teo according to the current outdoor environment temperature and the indoor set temperature.
Referring to the logic diagram of the variable frequency control of the refrigeration unit shown in fig. 2, after the refrigeration unit continuously performs the cooling operation for a preset time period, a target low-pressure temperature of the refrigeration unit is calculated according to the current outdoor ambient temperature and the indoor set temperature, wherein the target low-pressure temperature Teo is Tai + a Tao2+ B + Tao-C, Tao being the outdoor ambient temperature, Teo being the target low pressure temperature, Tai being the indoor set temperature. The preset time period may be a time length for the refrigerating unit to enter a stable refrigerating state after being started, such as 10-30 min.
Step 2: and acquiring the actual low-pressure temperature Te of the refrigerating unit, and judging whether Teo and Te meet the condition that Te is more than Teo.
And step 3: if so, controlling the compressor frequency of the refrigerating unit to increase to f(n)＝f(n-1)(1+D％)。
And 4, step 4: if not, judging whether Teo and Te meet Te < Teo.
And 5: when Te is<When Teo, controlling the compressor frequency of the refrigerating unit to be reduced to f(n)＝f(n-1)(1-D%); when Te is equal to Teo, controlling the compressor frequency f of the refrigerating unit(n)＝f(n-1)。
Wherein D is preferably 5%, in the range of 0-10%, f(n-1)For the current compressor frequency of the refrigeration unit, as shown in FIG. 2, when the compressor of the refrigeration unit is at frequency f(n)And after the operation is carried out for the preset time, returning to the step 1 to determine the target low-pressure temperature of the refrigerating unit again, and adjusting the frequency of the compressor according to the target low-pressure temperature.
For example, in the process of refrigerating operation of the refrigerating unit, the current outdoor environment temperature is detected to be 35 ℃, the indoor set temperature of the refrigeration house is detected to be 0 ℃, calculating the target low-pressure temperature to be-7.93 ℃ according to the preset calculation formula, wherein the running frequency of a compressor of the refrigerating unit is 60Hz, the actual low-pressure temperature is-4.9 ℃, the actual low-pressure temperature is higher than the target low-pressure temperature, the frequency of the refrigerating unit needs to be increased to enable the actual low-pressure temperature to be close to the target low-pressure temperature, the frequency of the refrigerating unit is increased to 63Hz after the refrigerating unit continues to operate for one period, the actual low-pressure temperature is reduced to-5.7 ℃, the actual low-pressure temperature is still higher than the target low-pressure temperature, the frequency of the refrigerating unit needs to be increased, the frequency of the refrigerating unit is controlled to be increased to 66Hz, the actual low-pressure temperature is reduced to-7.9 ℃, the actual low-pressure temperature is close to the target low-pressure temperature, the energy of the refrigeration house is sufficient, and a compressor of the refrigerating unit is controlled to maintain the current frequency to operate.
Example three:
corresponding to the method for controlling a refrigeration unit provided in the first embodiment, an embodiment of the present invention provides a refrigeration unit control device, which can be applied to a refrigeration unit, and referring to a schematic structural diagram of the refrigeration unit control device shown in fig. 3, the device includes the following modules:
and the temperature monitoring module 31 is used for monitoring the outdoor environment temperature and acquiring the indoor set temperature in the refrigerating operation process of the refrigerating unit.
And the temperature determining module 32 is used for determining the target low-pressure temperature of the refrigerating unit based on the outdoor environment temperature and the indoor set temperature.
And a frequency control module 33 for controlling the compressor operating frequency of the refrigeration unit based on the target low-pressure temperature.
According to the refrigerating unit control device provided by the embodiment, the target low-pressure temperature of the refrigerating unit is determined according to the monitored outdoor environment temperature and the monitored indoor set temperature, the refrigerating unit can be guaranteed to output enough cold energy under the current outdoor environment temperature, the running frequency of the compressor of the refrigerating unit is controlled according to the target low-pressure temperature, the frequency of the compressor of the refrigerating unit can be adjusted according to the change condition of the target low-pressure temperature, the frequent start and stop of the refrigerating unit are prevented from being controlled, and the control accuracy and reliability of the refrigerating unit are improved.
In one embodiment, the frequency control module 33 is further configured to monitor an actual low-pressure temperature of the refrigeration unit; and periodically controlling the running frequency of the compressor of the refrigerating unit based on the actual low-pressure temperature and the target low-pressure temperature.
In an embodiment, the frequency control module 33 is further configured to obtain a current compressor frequency of the refrigeration unit every preset time interval, and determine whether an actual low-pressure temperature is greater than a target low-pressure temperature; when the actual low-pressure temperature is higher than the target low-pressure temperature, controlling the current compressor frequency of the refrigerating unit to increase by a first preset frequency; wherein the first predetermined frequency is associated with a current compressor frequency of the refrigeration unit.
In one embodiment, the frequency control module 33 is further configured to control the refrigeration unit to maintain the current compressor frequency operation when the actual low-pressure temperature is equal to the target low-pressure temperature.
In an embodiment, the frequency control module 33 is further configured to control the current compressor frequency of the refrigeration unit to decrease by a second preset frequency when the actual low-pressure temperature is less than the target low-pressure temperature; wherein the second predetermined frequency is associated with a current operating frequency of the refrigeration unit compressor.
In an embodiment, the temperature determining module 32 is further configured to input the outdoor ambient temperature and the indoor set temperature into a preset calculation formula at preset time intervals to obtain a target low-pressure temperature; wherein, the preset calculation formula is as follows:
Teo＝Tai+A*Tao2+B*Tao-C
tao is the outdoor ambient temperature, Teo is the target low pressure temperature, Tai is the indoor set temperature, A, B and C are constants.
In one embodiment, the first preset frequency is the current compressor frequency D1%, the second preset frequency is the current compressor frequency D2%, and the values of D1% and D2% are both 0-10%.
The above-mentioned refrigerating unit controlling means that this embodiment provided, when refrigerating unit refrigerates the operation, can be according to the outdoor ambient temperature of difference and the indoor temperature of setting for of freezer, automatic accurate different target low pressure temperature of setting for (promptly confirm target low pressure temperature according to the load), the cold volume output of freezer can be guaranteed enough to this target low pressure, rethread target low pressure temperature and actual low pressure temperature difference adjust compressor frequency, thereby the refrigerating output of adjustment freezer, the self-adaptation frequency conversion to refrigerating unit has been realized and has been adjusted, the stability and the reliability of refrigerating unit self-adaptation control refrigerating output have been promoted.
Example four:
corresponding to the method for controlling a refrigeration unit provided in the first embodiment, the present embodiment provides a refrigeration unit, where the refrigeration unit includes a computer-readable storage medium storing a computer program and a processor, and the computer program is read by the processor and executed to implement the method for controlling a refrigeration unit provided in the first embodiment.
Example five:
the present embodiment further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the processes of the refrigeration unit control method embodiment, and can achieve the same technical effects, and in order to avoid repetition, the details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The refrigeration unit control device and the refrigeration unit disclosed by the embodiment correspond to the refrigeration unit control method disclosed by the embodiment, so that the description is relatively simple, and the relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.
Claims (9)
1. A refrigeration unit control method, comprising:
monitoring the outdoor environment temperature to obtain the indoor set temperature in the refrigerating operation process of the refrigerating unit;
determining a target low pressure temperature for the refrigeration unit based on the outdoor ambient temperature and the indoor set temperature;
controlling a compressor operating frequency of the refrigeration unit based on the target low pressure temperature;
the step of determining a target low pressure temperature for the refrigeration unit based on the outdoor ambient temperature and the indoor set temperature includes:
inputting the outdoor environment temperature and the indoor set temperature into a preset calculation formula at intervals of preset time to obtain the target low-pressure temperature; wherein the preset calculation formula is as follows:
Teo=Tai+A*Tao2+B*Tao-C；
tao is the outdoor ambient temperature, Teo is the target low-pressure temperature, Tai is the indoor set temperature, A, B and C are constants.
2. The refrigeration unit control method according to claim 1, wherein said step of controlling the operating frequency of the compressor of the refrigeration unit based on the target low pressure temperature comprises:
monitoring an actual low pressure temperature of the refrigeration unit;
and periodically controlling the running frequency of the compressor of the refrigerating unit based on the actual low-pressure temperature and the target low-pressure temperature.
3. The refrigeration unit control method according to claim 2, wherein said step of periodically controlling the operating frequency of the compressor of the refrigeration unit based on the actual low-pressure temperature and the target low-pressure temperature comprises:
acquiring the current compressor frequency of the refrigerating unit at preset time intervals, and judging whether the actual low-pressure temperature is greater than the target low-pressure temperature;
when the actual low-pressure temperature is higher than the target low-pressure temperature, controlling the current compressor frequency of the refrigerating unit to increase by a first preset frequency; wherein the first preset frequency is associated with a current compressor frequency of the refrigeration unit.
4. The refrigeration unit control method as set forth in claim 3 further including:
and when the actual low-pressure temperature is equal to the target low-pressure temperature, controlling the refrigerating unit to maintain the current compressor frequency to operate.
5. The refrigeration unit control method as set forth in claim 3 further including:
when the actual low-pressure temperature is lower than the target low-pressure temperature, controlling the current compressor frequency of the refrigerating unit to reduce a second preset frequency; wherein the second predetermined frequency is related to a current operating frequency of the refrigeration unit compressor.
6. The refrigeration unit control method according to claim 5, wherein the first predetermined frequency is the current compressor frequency D1%, and the second predetermined frequency is the current compressor frequency D2%, and the values of D1% and D2% are both in the range of 0-10%.
7. A refrigeration unit control apparatus, comprising:
the temperature monitoring module is used for monitoring the outdoor environment temperature and acquiring the indoor set temperature in the refrigerating operation process of the refrigerating unit; inputting the outdoor environment temperature and the indoor set temperature into a preset calculation formula at intervals of preset time to obtain a target low-pressure temperature; wherein the preset calculation formula is:
Teo=Tai+A*Tao2+B*Tao-C；
tao is the outdoor ambient temperature, Teo is the target low-pressure temperature, Tai is the indoor set temperature, A, B and C are constants;
the temperature determining module is used for determining the target low-pressure temperature of the refrigerating unit based on the outdoor environment temperature and the indoor set temperature;
and the frequency control module is used for controlling the running frequency of the compressor of the refrigerating unit based on the target low-pressure temperature.
8. A refrigeration unit comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to perform the method of any of claims 1 to 6.
9. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-6.
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| JP4032634B2 (en) * | 2000-11-13 | 2008-01-16 | ダイキン工業株式会社 | Air conditioner |
| KR101151995B1 (en) * | 2004-10-21 | 2012-06-01 | 한라공조주식회사 | Method for controlling air conditioner of vehicle |
| KR101156378B1 (en) * | 2004-10-21 | 2012-06-13 | 한라공조주식회사 | Method for controlling air conditioner of vehicle |
| JP2018151102A (en) * | 2017-03-10 | 2018-09-27 | ダイキン工業株式会社 | Air-conditioning device |
| DE102017127471A1 (en) * | 2017-08-21 | 2019-02-21 | Liebherr-Hausgeräte Ochsenhausen GmbH | Refrigerator and / or freezer with fan |
| US10704817B2 (en) * | 2017-10-04 | 2020-07-07 | Emerson Climate Technologies, Inc. | Capacity staging system for multiple compressors |
| CN111023424B (en) * | 2019-12-27 | 2021-09-14 | 宁波奥克斯电气股份有限公司 | Control method and system and air conditioner |
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Effective date of registration: 20221012 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
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