CN114234505A - Control method and device of refrigerating unit, refrigerating unit and storage medium - Google Patents
Control method and device of refrigerating unit, refrigerating unit and storage medium Download PDFInfo
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- 238000007906 compression Methods 0.000 claims abstract description 139
- 238000005057 refrigeration Methods 0.000 claims description 67
- 230000005494 condensation Effects 0.000 abstract description 9
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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
Abstract
The invention discloses a control method and a control device of a refrigerating unit, the refrigerating unit and a storage medium, wherein the method comprises the following steps: acquiring the outdoor temperature of the refrigerating unit, acquiring the indoor temperature of the refrigerating unit, and acquiring the compression ratio of a compressor of the refrigerating unit; determining the difference value between the outdoor temperature and the indoor temperature, and recording as the indoor and outdoor temperature difference; determining whether the indoor and outdoor temperature difference is greater than or equal to a set temperature; if the indoor and outdoor temperature difference is less than the set temperature, adjusting the rotating speed of the outer fan according to the compression ratio; and if the indoor and outdoor temperature difference is greater than or equal to the set temperature, directly adjusting the rotating speed of an external fan of the refrigerating unit. This scheme is adjusted through the mode that starts the operation under different operating modes to the condensation fan of annual refrigerating unit, can guarantee that annual refrigerating unit can stable start and normal operating.
Description
Technical Field
The invention belongs to the technical field of refrigerating units, particularly relates to a control method and device of a refrigerating unit, the refrigerating unit and a storage medium, and particularly relates to a control method and device of a condensing fan of a year-round refrigerating unit, the refrigerating unit and the storage medium.
Background
In the refrigeration technology, the refrigerating unit is used in large scale in the industries of chemical industry, medical treatment, metallurgy, communication and the like. However, the annual refrigerating unit has wide working condition range, the running state of the annual refrigerating unit is obviously changed along with day and night and seasons, and certain difficulty is brought to the running stability of the annual refrigerating unit; such as: when the annual refrigerating unit operates under different working conditions, the operation of the annual refrigerating unit is unstable due to large variation of the compression ratio.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a control method and a control device of a refrigerating unit, the refrigerating unit and a storage medium, which are used for solving the problem that the operation of the refrigerating unit is unstable due to large variation of a compression ratio when the refrigerating unit operates under different working conditions all year round, and achieving the effect of ensuring that the refrigerating unit can be stably started and normally operated all year round by adjusting the mode that a condensing fan of the refrigerating unit operates under different working conditions all year round.
The invention provides a control method of a refrigerating unit, which comprises the following steps: acquiring the outdoor temperature of the refrigerating unit, acquiring the indoor temperature of the refrigerating unit, and acquiring the compression ratio of a compressor of the refrigerating unit; determining the difference value between the outdoor temperature and the indoor temperature, and recording as the indoor and outdoor temperature difference; and determining whether the indoor and outdoor temperature difference is greater than or equal to a set temperature; if the indoor and outdoor temperature difference is smaller than the set temperature, adjusting the rotating speed of the outer fan according to the compression ratio; and if the indoor and outdoor temperature difference is greater than or equal to the set temperature, directly adjusting the rotating speed of an external fan of the refrigerating unit.
In some embodiments, adjusting the outer fan speed according to the compression ratio comprises: determining whether the compression ratio is greater than or equal to a lower limit of a set compression ratio range and less than or equal to an upper limit of the set compression ratio range; if the compression ratio is larger than or equal to the lower limit of the set compression ratio range and smaller than or equal to the upper limit of the set compression ratio range, controlling the outer fan to run at the current rotating speed and return to continuously obtain the compression ratio of the compressor, and continuously determining whether the compression ratio is larger than or equal to the lower limit of the set compression ratio range and smaller than or equal to the upper limit of the set compression ratio range; if the compression ratio is smaller than the lower limit of a set compression ratio range or larger than the upper limit of the set compression ratio range, controlling the rotating speed of an outer fan of the refrigerating unit to be adjusted to a set adjustment amount, and then returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature and continuously determine whether the indoor and outdoor temperature difference is larger than or equal to the set temperature; the set adjustment amount is determined according to a first set correspondence relationship among the rotation speed adjustment amount, the indoor temperature, the outdoor temperature, and the compressor frequency, that is, the current rotation speed adjustment amount corresponding to the current indoor temperature, the current outdoor temperature, and the current compressor frequency in the first set correspondence relationship is determined as the set adjustment amount.
In some embodiments, directly adjusting the external fan speed of the refrigeration unit comprises: controlling the rotating speed of an external fan of the refrigerating unit to be adjusted to a set rotating speed; the set rotating speed is determined according to a second set corresponding relation among the rotating speed, the indoor temperature, the outdoor temperature and the compressor frequency, namely, the current rotating speed corresponding to the current indoor temperature, the current outdoor temperature and the current compressor frequency in the second set corresponding relation is determined as the set rotating speed.
In some embodiments, directly adjusting the speed of the external fan of the refrigeration unit further comprises: after controlling the rotating speed of an external fan of the refrigerating unit to be adjusted to a set rotating speed, determining whether the current rotating speed of the external fan of the refrigerating unit is less than a set maximum rotating speed or not; if the current rotating speed of an external fan of the refrigerating unit is less than the set maximum rotating speed, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature; and if the current rotating speed of the external fan of the refrigerating unit is greater than or equal to the set maximum rotating speed, controlling the external fan of the refrigerating unit, continuously operating according to the current rotating speed of the external fan of the refrigerating unit, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature.
In accordance with another aspect of the present invention, there is provided a control apparatus for a refrigeration unit, including: an acquisition unit configured to acquire an outdoor temperature of the refrigeration unit, acquire an indoor temperature of the refrigeration unit, and acquire a compression ratio of a compressor of the refrigeration unit; a control unit configured to determine a difference between the outdoor temperature and the indoor temperature, and record the difference as an indoor temperature difference and an outdoor temperature difference; and determining whether the indoor and outdoor temperature difference is greater than or equal to a set temperature; the control unit is further configured to adjust the rotating speed of the outer fan according to the compression ratio if the indoor and outdoor temperature difference is smaller than the set temperature; the control unit is further configured to directly adjust the rotating speed of the external fan of the refrigerating unit if the indoor and outdoor temperature difference is greater than or equal to the set temperature.
In some embodiments, the control unit, adjusting the outer fan speed according to the compression ratio, comprises: determining whether the compression ratio is greater than or equal to a lower limit of a set compression ratio range and less than or equal to an upper limit of the set compression ratio range; if the compression ratio is larger than or equal to the lower limit of the set compression ratio range and smaller than or equal to the upper limit of the set compression ratio range, controlling the outer fan to run at the current rotating speed and return to continuously obtain the compression ratio of the compressor, and continuously determining whether the compression ratio is larger than or equal to the lower limit of the set compression ratio range and smaller than or equal to the upper limit of the set compression ratio range; if the compression ratio is smaller than the lower limit of a set compression ratio range or larger than the upper limit of the set compression ratio range, controlling the rotating speed of an outer fan of the refrigerating unit to be adjusted to a set adjustment amount, and then returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature and continuously determine whether the indoor and outdoor temperature difference is larger than or equal to the set temperature; the set adjustment amount is determined according to a first set correspondence relationship among the rotation speed adjustment amount, the indoor temperature, the outdoor temperature, and the compressor frequency, that is, the current rotation speed adjustment amount corresponding to the current indoor temperature, the current outdoor temperature, and the current compressor frequency in the first set correspondence relationship is determined as the set adjustment amount.
In some embodiments, the control unit, directly adjusting the external fan speed of the refrigeration unit, includes: controlling the rotating speed of an external fan of the refrigerating unit to be adjusted to a set rotating speed; the set rotating speed is determined according to a second set corresponding relation among the rotating speed, the indoor temperature, the outdoor temperature and the compressor frequency, namely, the current rotating speed corresponding to the current indoor temperature, the current outdoor temperature and the current compressor frequency in the second set corresponding relation is determined as the set rotating speed.
In some embodiments, the control unit directly adjusts an external fan speed of the refrigeration unit, further comprising: after controlling the rotating speed of an external fan of the refrigerating unit to be adjusted to a set rotating speed, determining whether the current rotating speed of the external fan of the refrigerating unit is less than a set maximum rotating speed or not; if the current rotating speed of an external fan of the refrigerating unit is less than the set maximum rotating speed, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature; and if the current rotating speed of the external fan of the refrigerating unit is greater than or equal to the set maximum rotating speed, controlling the external fan of the refrigerating unit, continuously operating according to the current rotating speed of the external fan of the refrigerating unit, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature.
In accordance with another aspect of the present invention, there is provided a refrigeration unit comprising: the control device for a refrigeration unit described above.
In accordance with the above method, a further aspect of the present invention provides a storage medium, which includes a stored program, wherein when the program runs, an apparatus in which the storage medium is located is controlled to execute the control method of the refrigeration unit.
Therefore, according to the scheme of the invention, the rotating speed of the outer fan is adjusted according to the compression ratio and the indoor and outdoor temperature and the compressor frequency by operating different adjusting modes according to the indoor and outdoor temperature difference, so that the year-round refrigerating unit can be stably started and normally operated by adjusting the mode that the condensing fan of the year-round refrigerating unit is started and operated under different working conditions.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating one embodiment of a method for controlling a refrigeration unit in accordance with the present invention;
FIG. 2 is a schematic flow chart illustrating one embodiment of adjusting the speed of the outer fan according to the compression ratio in the method of the present invention;
FIG. 3 is a schematic flow chart illustrating an embodiment of controlling the operation of the outer fan according to the upper limit of the rotational speed of the outer fan in the method of the present invention;
fig. 4 is a schematic structural diagram of an embodiment of a control device of the refrigeration unit according to the present invention;
FIG. 5 is a flowchart illustrating a control method of a condensing fan according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a variation curve of the rotating speed of the condensing fan according to the present invention.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
102-an obtaining unit; 104-control unit.
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.
In the related schemes of the control method of the refrigerating unit such as the condensing fan all the year round, the rotating speed of the outer fan can be linearly adjusted according to the outdoor temperature or the condensing temperature in some schemes, the operation is simple, but the variation range of the pressure ratio of the unit is large, and the brushless direct current motor needs to be matched. In other schemes, the rotating speed of the outer fan can be regulated in a staged mode according to the outdoor temperature/the condensation temperature, and if the outdoor temperature fluctuates near a set temperature point, the operation working condition of the unit can be changed continuously, and the unit cannot operate stably. In other schemes, the rotation speed of the motor is set according to the set value of the condensation pressure, when the condensation pressure is greater than the set value, the rotation speed of the motor is the first rotation speed n1, and when the condensation pressure is less than the set value, the rotation speed of the motor is the second rotation speed n2, which cannot ensure that the rotation speed of the condensation fan is the most suitable under all working conditions. In the running process of the refrigerating unit all the year round, the maximum rotating speed is generally kept, and the rotating speed is adjusted to a certain lower rotating speed under special conditions, so that the operation is simple, but the adaptive working condition is less.
According to an embodiment of the present invention, a method for controlling a refrigeration unit is provided, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The refrigeration unit includes: a compressor and an external fan. The control method of the refrigerating unit comprises the following steps: step S110 to step S140.
At step S110, an outdoor temperature of the refrigeration unit, an indoor temperature of the refrigeration unit, and a compression ratio of a compressor of the refrigeration unit are obtained.
At step S120, a difference between the outdoor temperature and the indoor temperature is determined and recorded as an indoor-outdoor temperature difference. And determining whether the indoor and outdoor temperature difference is greater than or equal to a set temperature.
In step S130, if the indoor and outdoor temperature difference is smaller than the set temperature, the rotation speed of the external fan is adjusted according to the compression ratio.
In some embodiments, in step S130, in the case that the indoor and outdoor temperature difference is less than the set temperature, the specific process of adjusting the rotation speed of the external fan according to the compression ratio is described as follows.
The following further describes, with reference to a schematic flow chart of an embodiment of adjusting the rotational speed of the external fan according to the compression ratio in the method of the present invention shown in fig. 2, a specific process of adjusting the rotational speed of the external fan according to the compression ratio in step S130, including: step S210 to step S230.
Step S210 determines whether the compression ratio is greater than or equal to the lower limit of the set compression ratio range and less than or equal to the upper limit of the set compression ratio range.
And S220, if the compression ratio is greater than or equal to the lower limit of the set compression ratio range and less than or equal to the upper limit of the set compression ratio range, controlling the outer fan to run at the current rotating speed, returning to continuously obtain the compression ratio of the compressor, and continuously determining whether the compression ratio is greater than or equal to the lower limit of the set compression ratio range and less than or equal to the upper limit of the set compression ratio range.
Step S230, if the compression ratio is smaller than the lower limit of the set compression ratio range or greater than the upper limit of the set compression ratio range, controlling the rotation speed of the external fan of the refrigeration unit to adjust to a set adjustment amount (for example, a set adjustment amount Δ N), and then returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determine whether the indoor and outdoor temperature difference is greater than or equal to the set temperature. The set adjustment amount is determined according to a first set correspondence relationship among the rotation speed adjustment amount, the indoor temperature, the outdoor temperature, and the compressor frequency, that is, the current rotation speed adjustment amount corresponding to the current indoor temperature, the current outdoor temperature, and the current compressor frequency in the first set correspondence relationship is determined as the set adjustment amount.
Fig. 5 is a flowchart illustrating an embodiment of a method for controlling a condensing fan according to the present invention, and fig. 6 is a diagram illustrating a variation curve of a rotation speed of the condensing fan according to the present invention. Referring to the examples shown in fig. 5 and 6, the invention provides a method for controlling a condensing fan of an annual refrigerating unit, which comprises the following steps:
step 1, when a refrigerating unit is started all year round, firstly, detecting indoor and outdoor temperature difference delta T, wherein the indoor and outdoor temperature difference delta T is equal to outdoor temperature ToutIndoor temperature Tin. Judgment roomWhether the internal and external temperature difference Δ T is greater than or equal to the set temperature T: if not, executing the step 2.
Step 2, when the indoor and outdoor temperature difference is delta T<Set temperature T, i.e. outdoor temperature Tout<Indoor temperature TinWhen the temperature T is set, the compression ratio epsilon of the compressor of the annual refrigerating unit is detected, and whether the compression ratio epsilon of the compressor of the annual refrigerating unit belongs to a set compression ratio interval epsilon or not is judged1，ε2]: if yes, go to step 21. Otherwise, step 22 is executed.
The compression ratio epsilon of the compressor of the year-round refrigerating unit is detected, and can be as follows: and a pressure sensor is adopted for data acquisition, or a mode of detecting the air suction and exhaust temperature of the compressor is adopted, and the air suction and exhaust pressure of the compressor is converted and measured. After the relevant data is acquired, the pressure ratio is obtained using the high/low pressure.
Step 21, when the compression ratio epsilon of the compressor of the annual refrigerating unit belongs to the set compression ratio interval epsilon1，ε2]And (3) controlling the condensing fan of the annual refrigerating unit to keep running at the current state, returning to the step 2, and continuously detecting whether the compression ratio epsilon of the compressor of the annual refrigerating unit meets the requirement, namely continuously detecting whether the compression ratio epsilon of the compressor of the annual refrigerating unit belongs to the set compression ratio interval [ epsilon ]1，ε2]。
Step 22, if the compression ratio epsilon of the compressor of the annual refrigerating unit does not belong to the set compression ratio interval epsilon1，ε2]And controlling the outer fan to adjust the rotating speed, wherein the rotating speed adjustment amount is the set adjustment amount delta N.
Wherein the adjustment quantity Δ N and the indoor temperature T are setinOutdoor temperature ToutThe relationship between the compressor operating frequency f may be a functional relationship. For example: f (Δ N) ═ F (T)in，ToutF), the set adjustment quantity Δ N is the indoor temperature TinOutdoor temperature ToutAnd f, the running frequency of the compressor, wherein f represents the running frequency of the compressor.
For example: when Δ T<When T is 0, Δ N is 20f +0.55 (T)out-Tin)2+45.5(Tout-Tin)-800。
In step 22, after the rotation speed of the external fan is controlled to adjust the rotation speed by the set adjustment amount Δ N, the procedure returns to step 1, the indoor and outdoor temperature difference is repeatedly detected, and whether the indoor and outdoor temperature difference Δ T is greater than or equal to the set temperature T is continuously determined.
Step 2 shows that when the indoor and outdoor temperature difference is small, the outdoor temperature is low, which causes the condensation pressure of the refrigerating unit to decrease all the year round, and thus the pressure ratio of the compressor is too low, so that the rotating speed of the outer fan needs to be reduced to increase the exhaust pressure of the compressor, and the compression ratio of the compressor is not too low to influence the normal operation of the compressor. When the temperature difference between the indoor and the outdoor is too small, the condensing fan needs to be closed, and the compression ratio of the compressor is ensured to be within a normal range.
In step S140, if the indoor and outdoor temperature difference is greater than or equal to the set temperature, the rotational speed of the external fan of the refrigeration unit is directly adjusted.
The problem that the unit is unstable in operation due to large variation of compression ratio when the refrigerating unit operates under different working conditions all the year around is considered. In order to ensure the annual normal and stable operation of the refrigerating unit, the invention provides a control method for a condensing fan of the annual refrigerating unit, in particular to a control method for starting and operating the condensing fan under different working conditions. Therefore, the problem that the unit operation is fluctuated due to wide variation range of the compression ratio when the refrigerating unit is started and operated under different working conditions all the year around is solved, and the refrigerating unit can be stably started and normally operated all the year around.
In some embodiments, in the case that the indoor and outdoor temperature difference is greater than or equal to the set temperature in step S140, directly adjusting the external fan speed of the refrigeration unit includes: and controlling the rotating speed of an external fan of the refrigerating unit to be adjusted to a set rotating speed (such as a set rotating speed N). The set rotating speed is determined according to a second set corresponding relation among the rotating speed, the indoor temperature, the outdoor temperature and the compressor frequency, namely, the current rotating speed corresponding to the current indoor temperature, the current outdoor temperature and the current compressor frequency in the second set corresponding relation is determined as the set rotating speed.
Fig. 5 is a flowchart illustrating an embodiment of a method for controlling a condensing fan according to the present invention, and fig. 6 is a diagram illustrating a variation curve of a rotation speed of the condensing fan according to the present invention. Referring to the examples shown in fig. 5 and 6, the invention provides a method for controlling a condensing fan of an annual refrigerating unit, which comprises the following steps:
step 1, when a refrigerating unit is started all year round, firstly, detecting indoor and outdoor temperature difference delta T, wherein the indoor and outdoor temperature difference delta T is equal to outdoor temperature ToutIndoor temperature Tin. Judging whether the indoor and outdoor temperature difference delta T is greater than or equal to a set temperature T: if yes, go to step 3.
Step 3, when the indoor and outdoor temperature difference delta T is larger than or equal to the set temperature T, namely the outdoor temperature ToutNot less than indoor temperature TinWhen the temperature T is set, the rotation speed of the external fan is adjusted to a set rotation speed N, G (N) ═ G (T)in，ToutF) the set speed N is Tin、ToutF, function of three variables.
For example: when Δ T<When T is 0, Δ N is 20f-0.8 (T)out-Tin)2+26(Tout-Tin)。
In some embodiments, in the case that the indoor and outdoor temperature difference is greater than or equal to the set temperature in step S140, directly adjusting the rotation speed of the external fan of the refrigeration unit further includes: and controlling the operation process of the outer fan according to the upper limit value of the rotating speed of the outer fan.
Referring to the flow diagram of an embodiment of the method of the present invention shown in fig. 3, in which the operation of the external fan is controlled according to the upper limit of the rotational speed of the external fan, a specific process of controlling the operation of the external fan according to the upper limit of the rotational speed of the external fan is further described, including: step S310 to step S330.
Step S310, after controlling the rotating speed of the external fan of the refrigerating unit to be adjusted to a set rotating speed, determining whether the current rotating speed of the external fan of the refrigerating unit is less than a set maximum rotating speed.
And step S320, if the current rotating speed of the external fan of the refrigerating unit is less than the set maximum rotating speed, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature.
And step S330, if the current rotating speed of the external fan of the refrigerating unit is greater than or equal to the set maximum rotating speed, controlling the external fan of the refrigerating unit, continuously operating according to the current rotating speed of the external fan of the refrigerating unit, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature.
Referring to the example shown in fig. 5 and 6, in step 3, after adjusting the rotation speed of the outer fan to the set rotation speed N, it is detected whether the current rotation speed N of the outer fan reaches the maximum rotation speed N of the outer fanmax: if not, the rotating speed of the outer fan can be continuously adjusted according to the related calculation formula, the step 1 is returned, the indoor and outdoor temperature difference is repeatedly detected, and whether the indoor and outdoor temperature difference delta T is larger than or equal to the set temperature T or not is continuously judged. And if the maximum outer fan rotating speed is reached, keeping the current outer fan rotating speed to operate.
For example, when Δ T<When T is 0, Δ N is 20f-0.8 (T)out-Tin)2+26(Tout-Tin). In this case, the indoor and outdoor temperatures are continuously detected and then the rotational speed is adjusted, and when the rotational speed is adjusted to the maximum, the indoor and outdoor temperatures are still detected, but the rotational speed of the external fan is kept to the maximum.
Step 3 shows that when the indoor and outdoor temperature difference is large, the external temperature is high, the condensing pressure of the unit is too high, and therefore the rotating speed of the outer fan needs to be increased to strengthen the heat exchange of the condenser and reduce the condensing pressure, so that the unit can normally operate.
For example: in the embodiment, when the indoor and outdoor temperature difference reaches-20 ℃, the pressure ratio of the compressor reaches 1.0, and the rotating speed of the condensing fan reaches 100 r/min. When the indoor and outdoor temperature difference is less than or equal to minus 40 ℃, the condensing fan enters a shutdown state.
For another example: in the embodiment, when the indoor and outdoor temperature difference reaches 10 ℃, the pressure ratio of the compressor reaches 2.5, and the rotating speed of the condensing fan reaches 1000 r/min. When the indoor and outdoor temperature difference is more than or equal to 10 ℃, the condensing fan enters the state of the highest rotating speed.
The following steps are repeated: when the indoor and outdoor temperature difference belongs to the interval (-20, 10), the rotating speed of the condensing fan changes in a cubic function form along with the indoor and outdoor temperature difference.
The scheme of the invention mainly aims at the condition that the unit is in low-temperature refrigeration (namely the indoor and outdoor temperature difference is low), whether the originally detected indoor and outdoor temperature difference belongs to a certain interval, after the relevant control and adjustment is finished, the step of detecting the indoor and outdoor temperature difference needs to be returned again, and then the relevant adjustment and control are carried out according to the current indoor and outdoor temperature difference, so that the real-time control of the condensing fan is realized, and the stable start and normal operation of the refrigerating unit all the year round are ensured.
Adopt the technical scheme of this embodiment, through the different regulation mode of operation according to indoor outer difference in temperature, adjust outer fan rotational speed according to compression ratio, adjust outer fan rotational speed according to indoor outer temperature and compressor frequency to, adjust through the mode that starts the operation under different operating modes to the condensation fan of annual refrigerating unit, can guarantee that annual refrigerating unit can stable start and normal operating.
According to the embodiment of the invention, a control device of the refrigerating unit corresponding to the control method of the refrigerating unit is also provided. Referring to fig. 4, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The refrigeration unit includes: a compressor and an external fan. The control device of the refrigerating unit comprises: an acquisition unit 102 and a control unit 104.
The obtaining unit 102 is configured to obtain an outdoor temperature of the refrigeration unit, obtain an indoor temperature of the refrigeration unit, and obtain a compression ratio of a compressor of the refrigeration unit. The specific functions and processes of the acquiring unit 102 are referred to in step S110.
A control unit 104 configured to determine a difference between the outdoor temperature and the indoor temperature, which is recorded as an indoor-outdoor temperature difference. And determining whether the indoor and outdoor temperature difference is greater than or equal to a set temperature. The specific function and processing of the control unit 104 are referred to in step S120.
The control unit 104 is further configured to adjust the rotation speed of the external fan according to the compression ratio if the indoor and outdoor temperature difference is less than the set temperature. The specific function and processing of the control unit 104 are also referred to in step S130.
In some embodiments, the controlling unit 104, in the case that the indoor and outdoor temperature difference is less than the set temperature, adjusting the outer fan speed according to the compression ratio, includes:
the control unit 104 is specifically further configured to determine whether the compression ratio is greater than or equal to a lower limit of a set compression ratio range and less than or equal to an upper limit of the set compression ratio range. The specific functions and processes of the control unit 104 are also referred to in step S210.
The control unit 104 is specifically configured to, if the compression ratio is greater than or equal to a lower limit of a set compression ratio range and less than or equal to an upper limit of the set compression ratio range, control the outer fan to operate at the current rotation speed and return to continue to obtain the compression ratio of the compressor, and continue to determine whether the compression ratio is greater than or equal to the lower limit of the set compression ratio range and less than or equal to the upper limit of the set compression ratio range. The specific functions and processes of the control unit 104 are also referred to in step S220.
The control unit 104 is specifically further configured to, if the compression ratio is smaller than a lower limit of a set compression ratio range or larger than an upper limit of the set compression ratio range, control the rotation speed of the external fan of the refrigeration unit to be adjusted to a set adjustment amount (for example, a set adjustment amount Δ N), and then return to continue to determine the indoor-outdoor temperature difference between the outdoor temperature and the indoor temperature, and to continue to determine whether the indoor-outdoor temperature difference is larger than or equal to a set temperature. The specific function and processing of the control unit 104 are also referred to in step S230. The set adjustment amount is determined according to a first set correspondence relationship among the rotation speed adjustment amount, the indoor temperature, the outdoor temperature, and the compressor frequency, that is, the current rotation speed adjustment amount corresponding to the current indoor temperature, the current outdoor temperature, and the current compressor frequency in the first set correspondence relationship is determined as the set adjustment amount.
Fig. 5 is a schematic flow chart of an embodiment of a control device of a condensing fan according to the present invention, and fig. 6 is a schematic diagram of a variation curve of a rotation speed of the condensing fan according to the present invention. Referring to the examples shown in fig. 5 and 6, the invention provides a control device for a condensing fan of a year round refrigeration unit, comprising:
step 1, when a refrigerating unit is started all year round, firstly, detecting indoor and outdoor temperature difference delta T, wherein the indoor and outdoor temperature difference delta T is equal to outdoor temperature ToutIndoor temperature Tin. Judging whether the indoor and outdoor temperature difference delta T is greater than or equal to a set temperature T: if not, executing the step 2.
Step 2, when the indoor and outdoor temperature difference is delta T<Set temperature T, i.e. outdoor temperature Tout<Indoor temperature TinWhen the temperature T is set, the compression ratio epsilon of the compressor of the annual refrigerating unit is detected, and whether the compression ratio epsilon of the compressor of the annual refrigerating unit belongs to a set compression ratio interval epsilon or not is judged1，ε2]: if yes, go to step 21. Otherwise, step 22 is executed. Step 21 or step 22 is performed.
Step 21, when the compression ratio epsilon of the compressor of the annual refrigerating unit belongs to the set compression ratio interval epsilon1，ε2]And (3) controlling the condensing fan of the annual refrigerating unit to keep running at the current state, returning to the step 2, and continuously detecting whether the compression ratio epsilon of the compressor of the annual refrigerating unit meets the requirement, namely continuously detecting whether the compression ratio epsilon of the compressor of the annual refrigerating unit belongs to the set compression ratio interval [ epsilon ]1，ε2]。
Step 22, if the compression ratio epsilon of the compressor of the annual refrigerating unit does not belong to the set compression ratio interval epsilon1，ε2]And controlling the outer fan to adjust the rotating speed, wherein the rotating speed adjustment amount is the set adjustment amount delta N.
Wherein the adjustment quantity Δ N and the indoor temperature T are setinOutdoor temperature ToutThe relationship between the compressor operating frequency f may be a function ofIs described. For example: f (Δ N) ═ F (T)in，ToutF), the set adjustment quantity Δ N is the indoor temperature TinOutdoor temperature ToutAnd f, the running frequency of the compressor, wherein f represents the running frequency of the compressor.
In step 22, after the rotation speed of the external fan is controlled to adjust the rotation speed by the set adjustment amount Δ N, the procedure returns to step 1, the indoor and outdoor temperature difference is repeatedly detected, and whether the indoor and outdoor temperature difference Δ T is greater than or equal to the set temperature T is continuously determined.
Step 2 shows that when the indoor and outdoor temperature difference is small, the outdoor temperature is low, which causes the condensation pressure of the refrigerating unit to decrease all the year round, and thus the pressure ratio of the compressor is too low, so that the rotating speed of the outer fan needs to be reduced to increase the exhaust pressure of the compressor, and the compression ratio of the compressor is not too low to influence the normal operation of the compressor. When the temperature difference between the indoor and the outdoor is too small, the condensing fan needs to be closed, and the compression ratio of the compressor is ensured to be within a normal range.
The control unit 104 is further configured to directly adjust the rotation speed of the external fan of the refrigeration unit if the indoor and outdoor temperature difference is greater than or equal to the set temperature. The specific function and processing of the control unit 104 are also referred to in step S140.
The problem that the unit is unstable in operation due to large variation of compression ratio when the refrigerating unit operates under different working conditions all the year around is considered. In order to ensure the annual normal and stable operation of the refrigerating unit, the invention provides a control device for a condensing fan of the annual refrigerating unit, in particular to a control device for starting and operating the condensing fan under different working conditions, operating different adjusting modes according to indoor and outdoor temperature differences, adjusting the rotating speed of an outer fan according to a compression ratio, adjusting the rotating speed of the outer fan according to indoor and outdoor temperatures and the frequency of a compressor, ensuring the annual stable starting and operation of the annual refrigerating unit and reducing the annual operating fluctuation of the annual refrigerating unit. Therefore, the problem that the unit operation is fluctuated due to wide variation range of the compression ratio when the refrigerating unit is started and operated under different working conditions all the year around is solved, and the refrigerating unit can be stably started and normally operated all the year around.
In some embodiments, the controlling unit 104, in the case that the indoor and outdoor temperature difference is greater than or equal to the set temperature, directly adjusts the external fan speed of the refrigeration unit, including: the control unit 104 is specifically configured to control the rotation speed of the external fan of the refrigeration unit to be adjusted to a set rotation speed (e.g., a set rotation speed N). The set rotating speed is determined according to a second set corresponding relation among the rotating speed, the indoor temperature, the outdoor temperature and the compressor frequency, namely, the current rotating speed corresponding to the current indoor temperature, the current outdoor temperature and the current compressor frequency in the second set corresponding relation is determined as the set rotating speed.
Fig. 5 is a schematic flow chart of an embodiment of a control device of a condensing fan according to the present invention, and fig. 6 is a schematic diagram of a variation curve of a rotation speed of the condensing fan according to the present invention. Referring to the examples shown in fig. 5 and 6, the invention provides a control device for a condensing fan of a year round refrigeration unit, comprising:
step 1, when a refrigerating unit is started all year round, firstly, detecting indoor and outdoor temperature difference delta T, wherein the indoor and outdoor temperature difference delta T is equal to outdoor temperature ToutIndoor temperature Tin. Judging whether the indoor and outdoor temperature difference delta T is greater than or equal to a set temperature T: if yes, go to step 3.
Step 3, when the indoor and outdoor temperature difference delta T is larger than or equal to the set temperature T, namely the outdoor temperature ToutNot less than indoor temperature TinWhen the temperature T is set, the rotation speed of the external fan is adjusted to a set rotation speed N, G (N) ═ G (T)in，ToutF) the set speed N is Tin、ToutF, function of three variables.
In some embodiments, the control unit 104 directly adjusts the external fan speed of the refrigeration unit when the indoor-outdoor temperature difference is greater than or equal to the set temperature, and further includes: the process of controlling the operation of the outer fan according to the upper limit value of the rotating speed of the outer fan is as follows:
the control unit 104 is specifically further configured to determine whether the current rotation speed of the external fan of the refrigeration unit is less than a set maximum rotation speed after controlling the rotation speed of the external fan of the refrigeration unit to be adjusted to the set rotation speed. The specific functions and processes of the control unit 104 are also referred to in step S310.
The control unit 104 is further specifically configured to, if the current rotation speed of the external fan of the refrigeration unit is less than the set maximum rotation speed, return to continue to determine the indoor-outdoor temperature difference between the outdoor temperature and the indoor temperature, and continue to determine whether the indoor-outdoor temperature difference is greater than or equal to the set temperature. The specific functions and processes of the control unit 104 are also referred to in step S320.
The control unit 104 is specifically further configured to, if the current rotation speed of the external fan of the refrigeration unit is greater than or equal to the set maximum rotation speed, control the external fan of the refrigeration unit, continue to operate at the current rotation speed of the external fan of the refrigeration unit, and return to continue to determine the indoor-outdoor temperature difference between the outdoor temperature and the indoor temperature, and continue to determine whether the indoor-outdoor temperature difference is greater than or equal to the set temperature. The specific functions and processes of the control unit 104 are also referred to in step S330.
Referring to the example shown in fig. 5 and 6, in step 3, after adjusting the rotation speed of the outer fan to the set rotation speed N, it is detected whether the current rotation speed N of the outer fan reaches the maximum rotation speed N of the outer fanmax: if not, the rotating speed of the outer fan can be continuously adjusted according to the related calculation formula, the step 1 is returned, the indoor and outdoor temperature difference is repeatedly detected, and whether the indoor and outdoor temperature difference delta T is larger than or equal to the set temperature T or not is continuously judged. And if the maximum outer fan rotating speed is reached, keeping the current outer fan rotating speed to operate.
Step 3 shows that when the indoor and outdoor temperature difference is large, the external temperature is high, the condensing pressure of the unit is too high, and therefore the rotating speed of the outer fan needs to be increased to strengthen the heat exchange of the condenser and reduce the condensing pressure, so that the unit can normally operate.
For example: in the embodiment, when the indoor and outdoor temperature difference reaches-20 ℃, the pressure ratio of the compressor reaches 1.0, and the rotating speed of the condensing fan reaches 100 r/min. When the indoor and outdoor temperature difference is less than or equal to minus 40 ℃, the condensing fan enters a shutdown state.
For another example: in this embodiment, when the temperature difference between the indoor and outdoor sides reaches 10 ℃, the compressor pressure ratio reaches 2.5, and the condensing fan speed (i.e., the external fan speed) reaches 1000 r/min. When the indoor and outdoor temperature difference is more than or equal to 10 ℃, the condensing fan enters the state of the highest rotating speed.
The following steps are repeated: when the indoor and outdoor temperature difference belongs to the interval (-20, 10), the rotating speed of the condensing fan (namely the rotating speed of the outer fan) changes in a cubic function form along with the indoor and outdoor temperature difference.
The scheme of the invention mainly aims at the condition that the unit is in low-temperature refrigeration (namely the indoor and outdoor temperature difference is low), whether the originally detected indoor and outdoor temperature difference belongs to a certain interval, after the relevant control and adjustment is finished, the step of detecting the indoor and outdoor temperature difference needs to be returned again, and then the relevant adjustment and control are carried out according to the current indoor and outdoor temperature difference, so that the real-time control of the condensing fan is realized, and the stable start and normal operation of the refrigerating unit all the year round are ensured.
Since the processes and functions implemented by the apparatus of this embodiment substantially correspond to the embodiments, principles and examples of the method, reference may be made to the related descriptions in the embodiments without being detailed in the description of this embodiment, which is not described herein again.
By adopting the technical scheme of the invention, the rotating speed of the outer fan is adjusted according to the compression ratio and the indoor and outdoor temperature and the compressor frequency by operating different adjusting modes according to the indoor and outdoor temperature difference, so that the problem that the operation of the refrigerating unit is fluctuated due to wide variation range of the compression ratio when the refrigerating unit is started under different working conditions and operates all the year around can be solved.
According to an embodiment of the invention, a refrigeration unit corresponding to the control device of the refrigeration unit is also provided. The refrigeration unit may include: the control device for a refrigeration unit described above.
Since the processes and functions of the refrigeration unit of this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing devices, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
By adopting the technical scheme of the invention, the running fluctuation of the refrigerating unit all the year round can be reduced by operating different adjusting modes according to the indoor and outdoor temperature difference, adjusting the rotating speed of the outer fan according to the compression ratio and adjusting the rotating speed of the outer fan according to the indoor and outdoor temperature and the frequency of the compressor.
According to an embodiment of the present invention, there is also provided a storage medium corresponding to a control method of a refrigeration unit, the storage medium including a stored program, wherein when the program is executed, an apparatus in which the storage medium is located is controlled to execute the control method of the refrigeration unit.
Since the processing and functions implemented by the storage medium of this embodiment substantially correspond to the embodiments, principles, and examples of the foregoing method, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
By adopting the technical scheme of the invention, the reliability and the stability of the operation of the refrigerating unit all the year around can be improved by operating different adjusting modes according to the indoor and outdoor temperature difference, adjusting the rotating speed of the outer fan according to the compression ratio and adjusting the rotating speed of the outer fan according to the indoor and outdoor temperature and the frequency of the compressor.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
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 (10)
1. A method of controlling a refrigeration unit, comprising:
acquiring the outdoor temperature of the refrigerating unit, acquiring the indoor temperature of the refrigerating unit, and acquiring the compression ratio of a compressor of the refrigerating unit;
determining the difference value between the outdoor temperature and the indoor temperature, and recording as the indoor and outdoor temperature difference; and determining whether the indoor and outdoor temperature difference is greater than or equal to a set temperature;
if the indoor and outdoor temperature difference is smaller than the set temperature, adjusting the rotating speed of the outer fan according to the compression ratio;
and if the indoor and outdoor temperature difference is greater than or equal to the set temperature, directly adjusting the rotating speed of an external fan of the refrigerating unit.
2. The refrigeration unit control method as set forth in claim 1 wherein adjusting the speed of the outside fan based on the compression ratio comprises:
determining whether the compression ratio is greater than or equal to a lower limit of a set compression ratio range and less than or equal to an upper limit of the set compression ratio range;
if the compression ratio is larger than or equal to the lower limit of the set compression ratio range and smaller than or equal to the upper limit of the set compression ratio range, controlling the outer fan to run at the current rotating speed and return to continuously obtain the compression ratio of the compressor, and continuously determining whether the compression ratio is larger than or equal to the lower limit of the set compression ratio range and smaller than or equal to the upper limit of the set compression ratio range;
if the compression ratio is smaller than the lower limit of a set compression ratio range or larger than the upper limit of the set compression ratio range, controlling the rotating speed of an outer fan of the refrigerating unit to be adjusted to a set adjustment amount, and then returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature and continuously determine whether the indoor and outdoor temperature difference is larger than or equal to the set temperature;
the set adjustment amount is determined according to a first set correspondence relationship among the rotation speed adjustment amount, the indoor temperature, the outdoor temperature, and the compressor frequency, that is, the current rotation speed adjustment amount corresponding to the current indoor temperature, the current outdoor temperature, and the current compressor frequency in the first set correspondence relationship is determined as the set adjustment amount.
3. The refrigeration unit control method of claim 1, wherein directly adjusting the external fan speed of the refrigeration unit comprises:
controlling the rotating speed of an external fan of the refrigerating unit to be adjusted to a set rotating speed;
the set rotating speed is determined according to a second set corresponding relation among the rotating speed, the indoor temperature, the outdoor temperature and the compressor frequency, namely, the current rotating speed corresponding to the current indoor temperature, the current outdoor temperature and the current compressor frequency in the second set corresponding relation is determined as the set rotating speed.
4. The refrigeration unit control method of claim 3, wherein directly adjusting the external fan speed of the refrigeration unit further comprises:
after controlling the rotating speed of an external fan of the refrigerating unit to be adjusted to a set rotating speed, determining whether the current rotating speed of the external fan of the refrigerating unit is less than a set maximum rotating speed or not;
if the current rotating speed of an external fan of the refrigerating unit is less than the set maximum rotating speed, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature;
and if the current rotating speed of the external fan of the refrigerating unit is greater than or equal to the set maximum rotating speed, controlling the external fan of the refrigerating unit, continuously operating according to the current rotating speed of the external fan of the refrigerating unit, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature.
5. A control device for a refrigeration unit, comprising:
an acquisition unit configured to acquire an outdoor temperature of the refrigeration unit, acquire an indoor temperature of the refrigeration unit, and acquire a compression ratio of a compressor of the refrigeration unit;
a control unit configured to determine a difference between the outdoor temperature and the indoor temperature, and record the difference as an indoor temperature difference and an outdoor temperature difference; and determining whether the indoor and outdoor temperature difference is greater than or equal to a set temperature;
the control unit is further configured to adjust the rotating speed of the outer fan according to the compression ratio if the indoor and outdoor temperature difference is smaller than the set temperature;
the control unit is further configured to directly adjust the rotating speed of the external fan of the refrigerating unit if the indoor and outdoor temperature difference is greater than or equal to the set temperature.
6. The refrigeration unit control as set forth in claim 5 wherein said control unit adjusts said outside fan speed based on said compression ratio and includes:
determining whether the compression ratio is greater than or equal to a lower limit of a set compression ratio range and less than or equal to an upper limit of the set compression ratio range;
if the compression ratio is larger than or equal to the lower limit of the set compression ratio range and smaller than or equal to the upper limit of the set compression ratio range, controlling the outer fan to run at the current rotating speed and return to continuously obtain the compression ratio of the compressor, and continuously determining whether the compression ratio is larger than or equal to the lower limit of the set compression ratio range and smaller than or equal to the upper limit of the set compression ratio range;
if the compression ratio is smaller than the lower limit of a set compression ratio range or larger than the upper limit of the set compression ratio range, controlling the rotating speed of an outer fan of the refrigerating unit to be adjusted to a set adjustment amount, and then returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature and continuously determine whether the indoor and outdoor temperature difference is larger than or equal to the set temperature;
the set adjustment amount is determined according to a first set correspondence relationship among the rotation speed adjustment amount, the indoor temperature, the outdoor temperature, and the compressor frequency, that is, the current rotation speed adjustment amount corresponding to the current indoor temperature, the current outdoor temperature, and the current compressor frequency in the first set correspondence relationship is determined as the set adjustment amount.
7. The refrigeration unit control device according to claim 5, wherein the control unit directly adjusts the rotational speed of the external fan of the refrigeration unit, and comprises:
controlling the rotating speed of an external fan of the refrigerating unit to be adjusted to a set rotating speed;
the set rotating speed is determined according to a second set corresponding relation among the rotating speed, the indoor temperature, the outdoor temperature and the compressor frequency, namely, the current rotating speed corresponding to the current indoor temperature, the current outdoor temperature and the current compressor frequency in the second set corresponding relation is determined as the set rotating speed.
8. The control for a refrigeration unit as set forth in claim 7 wherein said control unit directly adjusts the speed of an external fan of said refrigeration unit and further includes:
after controlling the rotating speed of an external fan of the refrigerating unit to be adjusted to a set rotating speed, determining whether the current rotating speed of the external fan of the refrigerating unit is less than a set maximum rotating speed or not;
if the current rotating speed of an external fan of the refrigerating unit is less than the set maximum rotating speed, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature;
and if the current rotating speed of the external fan of the refrigerating unit is greater than or equal to the set maximum rotating speed, controlling the external fan of the refrigerating unit, continuously operating according to the current rotating speed of the external fan of the refrigerating unit, returning to continuously determine the indoor and outdoor temperature difference between the outdoor temperature and the indoor temperature, and continuously determining whether the indoor and outdoor temperature difference is greater than or equal to the set temperature.
9. A refrigeration unit, comprising: control device for a refrigeration unit as claimed in any of claims 5 to 8.
10. A storage medium characterized by comprising a stored program, wherein the apparatus in which the storage medium is located is controlled to perform the control method of the refrigeration unit according to any one of claims 1 to 4 when the program is executed.
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