CN113606840B

CN113606840B - Refrigerating system, control method and device thereof, storage medium and processor

Info

Publication number: CN113606840B
Application number: CN202110902493.8A
Authority: CN
Inventors: 明仁亮; 张植荣; 刘志辉; 刘红艳; 叶梓健; 周逢杭
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2022-05-17
Anticipated expiration: 2041-08-06
Also published as: CN113606840A

Abstract

The invention discloses a control method and a control device of a refrigerating system, the refrigerating system, a storage medium and a processor, wherein the method comprises the following steps: in the refrigeration stage of the refrigeration system, the switch unit is controlled to control the on or off of a corresponding first heat exchange sub-flow path in more than two first heat exchange sub-flow paths and control the on or off of a corresponding second heat exchange sub-flow path in more than two second heat exchange sub-flow paths, so that the adjustment of the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger is realized; in the defrosting stage of the refrigerating system, under the condition of the adjusted first heat exchange area of the first heat exchanger and the adjusted second heat exchange area of the second heat exchanger, the opening or closing of an outdoor fan of the refrigerating system is controlled according to the current pressure of the refrigerating system, and the frequency of the outdoor fan of the refrigerating system is controlled under the condition that the outdoor fan of the refrigerating system is opened. This scheme through the heat transfer area who adjusts condenser and evaporimeter, can avoid appearing high-pressure protection for it is more thorough to change the frost.

Description

Refrigerating system, control method and device thereof, storage medium and processor

Technical Field

The invention belongs to the technical field of refrigeration, and particularly relates to a control method and device of a refrigeration system, the refrigeration system, a storage medium and a processor, in particular to a method and device for preventing high pressure of thermal fluorination defrosting of a refrigeration house unit, the refrigeration system, the storage medium and the processor.

Background

The complete set of hot fluoride defrosting units for the cold storage is characterized in that an inner machine plays the role of a condenser during defrosting. In order to avoid the temperature rise of the storage during defrosting, the fan of the internal machine is not operated normally; and the fan of the internal unit does not operate, so that the heat exchange capability of the internal unit is poor, and the system is protected by high pressure and exits the defrosting environment in advance. At this time, the defrosting of the inner unit is not thorough, and further the refrigerating effect of the inner unit in the refrigerating stage is poor.

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 device of a refrigerating system, the refrigerating system, a storage medium and a processor, so as to solve the problem that the defrosting is not complete due to the fact that a fan of an internal machine does not operate and high-pressure protection is easy to occur during defrosting of a refrigeration house, and the defrosting environment is withdrawn in advance, and achieve the effect of avoiding high-pressure protection and enabling defrosting to be more complete by adjusting the heat exchange areas of a condenser and an evaporator.

The invention provides a control method of a refrigeration system, which comprises the following steps: the refrigeration system, comprising: the device comprises a first heat exchanger, a second heat exchanger, a liquid separation assembly and a switch unit; the number of the liquid separating components is N, and N is a positive integer; the liquid separation assemblies are arranged on the heat exchange flow paths of the first heat exchanger and the second heat exchanger so as to divide a first heat exchange flow path of the first heat exchanger into more than two first heat exchange sub-flow paths and divide a second heat exchange flow path of the second heat exchanger into more than two second heat exchange sub-flow paths; the switch unit can control the on or off of any one of the two or more first heat exchange sub-flow paths and the two or more second heat exchange sub-flow paths; the control method of the refrigeration system comprises the following steps: in a refrigeration stage of the refrigeration system, the switch unit is controlled to control the on or off of a corresponding first heat exchange sub-flow path in more than two first heat exchange sub-flow paths and control the on or off of a corresponding second heat exchange sub-flow path in more than two second heat exchange sub-flow paths, so that the adjustment of a first heat exchange area of the first heat exchanger and a second heat exchange area of the second heat exchanger is realized; in the defrosting stage of the refrigeration system, under the adjusted first heat exchange area of the first heat exchanger and the adjusted second heat exchange area of the second heat exchanger, the opening or closing of an outdoor fan of the refrigeration system is controlled according to the current pressure of the refrigeration system, and the frequency of the outdoor fan of the refrigeration system is controlled under the condition that the outdoor fan of the refrigeration system is opened.

In some embodiments, wherein the liquid separation assembly comprises: the liquid separation head and the pipeline are arranged between the liquid separation head and the corresponding heat exchanger; the pipelines between the liquid separation heads and the corresponding heat exchangers form heat exchange sub-flow paths; two or more of the first heat exchange sub-flow paths include: a first flow path distributed on both sides of the first heat exchanger, and a second flow path distributed on both sides of the first heat exchanger; two or more of the second heat exchange sub-flow paths include: a third flow path distributed on both sides of the second heat exchanger, and a fourth flow path distributed on both sides of the second heat exchanger; the switching unit includes: valves disposed at taps of respective ones of the first, second, third, and fourth flow paths, valves disposed between the respective flow paths and a four-way valve of the refrigeration system, and valves disposed between the respective flow paths and respective ones of the first and second heat exchangers.

In some embodiments, controlling the switch unit to control on or off of a corresponding first heat exchange sub-flow path of the two or more first heat exchange sub-flow paths and to control on or off of a corresponding second heat exchange sub-flow path of the two or more second heat exchange sub-flow paths includes: determining a refrigeration demand of the refrigeration system; determining the ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger according to the refrigeration demand of the refrigeration system; and controlling the switch unit according to the ratio of the first heat exchange area of the first heat exchanger to the second heat exchange area of the second heat exchanger so as to control the on or off of corresponding first heat exchange sub-flow paths in more than two first heat exchange sub-flow paths and control the on or off of corresponding second heat exchange sub-flow paths in more than two second heat exchange sub-flow paths, thereby realizing the adjustment of the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger.

In some embodiments, an outdoor fan of the refrigeration system comprises: a first fan and a second fan; controlling the opening or closing of an outdoor fan of the refrigeration system according to the current pressure of the refrigeration system, and controlling the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is opened, wherein the method comprises the following steps: controlling the frequency of the first fan to be reduced within a first rated frequency range under the condition that the current pressure of the refrigeration system is equal to a set value; under the condition that the frequency of the first fan is reduced to a first set frequency within the first rated frequency range, if the current pressure of the refrigeration system is smaller than the set value, controlling the frequency of the first fan to be maintained at the first set frequency for defrosting; and under the condition that the frequency of the first fan is reduced to the lower limit of the first rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, controlling the frequency of the second fan to be reduced in a second rated frequency range.

In some embodiments, controlling the on or off of an outdoor fan of the refrigeration system based on a current pressure of the refrigeration system, and controlling a frequency of the outdoor fan of the refrigeration system if the outdoor fan of the refrigeration system is on, further comprises: after controlling the frequency of the second fan to be reduced in a second rated frequency range, if the current pressure of the refrigeration system is lower than the set value under the condition that the frequency of the second fan is reduced to a second set frequency in the second rated frequency range, controlling the frequency of the first fan to be maintained at the lower limit of the first rated frequency range and controlling the frequency of the second fan to be maintained at a first set frequency in the second rated frequency range for defrosting; under the condition that the frequency of the first fan is maintained at the lower limit of the first rated frequency range and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, the first fan is controlled to be turned off; under the condition that the first fan is turned off and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is smaller than the set value, the refrigeration system is controlled to maintain the current state for defrosting; and under the condition that the first fan is turned off and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, controlling the second fan to be turned off.

In some embodiments, controlling the on or off of an outdoor fan of the refrigeration system based on a current pressure of the refrigeration system, and controlling a frequency of the outdoor fan of the refrigeration system if the outdoor fan of the refrigeration system is on, further comprises: under the condition that the first fan and the second fan are both closed, if the current pressure of the refrigeration system is smaller than the set value, controlling the refrigeration system to maintain the current state for defrosting; and under the condition that the first fan and the second fan are both closed, if the current pressure of the refrigeration system is greater than or equal to the set value, readjusting the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger, and controlling the refrigeration system to continue defrosting under the readjusted first heat exchange area of the first heat exchanger and the readjusted second heat exchange area of the second heat exchanger.

In some embodiments, further comprising: after controlling the opening or closing of an outdoor fan of the refrigeration system and controlling the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is opened, determining defrosting parameters of a defrosting stage of the refrigeration system and determining optimal defrosting parameters in the defrosting parameters of the defrosting stage of the refrigeration system so as to defrost according to the optimal defrosting parameters when entering the defrosting stage again; wherein, the parameters in the defrosting parameters and the optimized defrosting parameters comprise at least one of the following parameters: the ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger, the opening and closing condition of the outdoor fan, the frequency of the outdoor fan under the opening condition, and the defrosting time of the refrigerating system.

In accordance with another aspect of the present invention, there is provided a control device for a refrigeration system, the refrigeration system including: the device comprises a first heat exchanger, a second heat exchanger, a liquid separation assembly and a switch unit; the number of the liquid separating components is N, and N is a positive integer; the liquid separation assemblies are arranged on the heat exchange flow paths of the first heat exchanger and the second heat exchanger so as to divide a first heat exchange flow path of the first heat exchanger into more than two first heat exchange sub-flow paths and divide a second heat exchange flow path of the second heat exchanger into more than two second heat exchange sub-flow paths; the switch unit can control the on or off of any one of the two or more first heat exchange sub-flow paths and the two or more second heat exchange sub-flow paths; the control device of the refrigeration system comprises: the control unit is configured to control the switch unit to control the on or off of a corresponding first heat exchange sub-flow path in the more than two first heat exchange sub-flow paths and control the on or off of a corresponding second heat exchange sub-flow path in the more than two second heat exchange sub-flow paths in a refrigeration stage of the refrigeration system, so that the adjustment of the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger is realized; the control unit is further configured to control the opening or closing of an outdoor fan of the refrigeration system according to the current pressure of the refrigeration system in the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger after adjustment in a defrosting stage of the refrigeration system, and control the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is opened.

In some embodiments, wherein the liquid separation assembly comprises: the liquid separation head and the pipeline are arranged between the liquid separation head and the corresponding heat exchanger; a heat exchange sub-flow path is formed by a pipeline between the liquid separation head and the corresponding heat exchanger; two or more of the first heat exchange sub-flow paths include: a first flow path distributed on both sides of the first heat exchanger, and a second flow path distributed on both sides of the first heat exchanger; two or more of the second heat exchange sub-flow paths include: a third flow path distributed on both sides of the second heat exchanger, and a fourth flow path distributed on both sides of the second heat exchanger; the switching unit includes: valves disposed at taps of respective ones of the first, second, third, and fourth flow paths, valves disposed between the respective flow paths and a four-way valve of the refrigeration system, and valves disposed between the respective flow paths and respective ones of the first and second heat exchangers.

In some embodiments, the control unit controls the switch unit to control on or off of a corresponding first heat exchange sub-flow path in the two or more first heat exchange sub-flow paths and to control on or off of a corresponding second heat exchange sub-flow path in the two or more second heat exchange sub-flow paths, and the control unit includes: determining a refrigeration demand of the refrigeration system; determining the ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger according to the refrigeration demand of the refrigeration system; and controlling the switch unit according to the ratio of the first heat exchange area of the first heat exchanger to the second heat exchange area of the second heat exchanger so as to control the on or off of corresponding first heat exchange sub-flow paths in more than two first heat exchange sub-flow paths and control the on or off of corresponding second heat exchange sub-flow paths in more than two second heat exchange sub-flow paths, thereby realizing the adjustment of the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger.

In some embodiments, an outdoor fan of the refrigeration system comprises: a first fan and a second fan; the control unit controls the opening or closing of an outdoor fan of the refrigeration system according to the current pressure of the refrigeration system, and controls the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is opened, and the control method comprises the following steps: controlling the frequency of the first fan to be reduced within a first rated frequency range under the condition that the current pressure of the refrigeration system is equal to a set value; under the condition that the frequency of the first fan is reduced to a first set frequency within the first rated frequency range, if the current pressure of the refrigeration system is smaller than the set value, controlling the frequency of the first fan to be maintained at the first set frequency for defrosting; and under the condition that the frequency of the first fan is reduced to the lower limit of the first rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, controlling the frequency of the second fan to be reduced in a second rated frequency range.

In some embodiments, the control unit controls the outdoor fan of the refrigeration system to be turned on or off according to the current pressure of the refrigeration system, and controls the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is turned on, further comprising: after controlling the frequency of the second fan to be reduced in a second rated frequency range, if the current pressure of the refrigeration system is lower than the set value under the condition that the frequency of the second fan is reduced to a second set frequency in the second rated frequency range, controlling the frequency of the first fan to be maintained at the lower limit of the first rated frequency range and controlling the frequency of the second fan to be maintained at a first set frequency in the second rated frequency range for defrosting; under the condition that the frequency of the first fan is maintained at the lower limit of the first rated frequency range and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, the first fan is controlled to be turned off; under the condition that the first fan is turned off and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is smaller than the set value, the refrigeration system is controlled to maintain the current state for defrosting; and under the condition that the first fan is turned off and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, controlling the second fan to be turned off.

In some embodiments, the control unit controls the outdoor fan of the refrigeration system to be turned on or off according to the current pressure of the refrigeration system, and controls the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is turned on, further comprising: under the condition that the first fan and the second fan are both closed, if the current pressure of the refrigeration system is smaller than the set value, controlling the refrigeration system to maintain the current state for defrosting; and under the condition that the first fan and the second fan are both closed, if the current pressure of the refrigeration system is greater than or equal to the set value, readjusting the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger, and controlling the refrigeration system to continue defrosting under the readjusted first heat exchange area of the first heat exchanger and the readjusted second heat exchange area of the second heat exchanger.

In some embodiments, further comprising: the control unit is further configured to determine defrosting parameters of a defrosting stage of the refrigeration system and determine an optimal defrosting parameter of the defrosting parameters of the defrosting stage of the refrigeration system after controlling the on or off of an outdoor fan of the refrigeration system and controlling the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is on, so as to defrost according to the optimal defrosting parameters when entering the defrosting stage again; wherein, the parameters in the defrosting parameters and the optimized defrosting parameters comprise at least one of the following parameters: the ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger, the opening and closing condition of the outdoor fan, the frequency of the outdoor fan under the opening condition, and the defrosting time of the refrigerating system.

In accordance with another aspect of the present invention, there is provided a refrigeration system including: the control device of the refrigeration system 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 system described above.

In accordance with the above method, a further aspect of the present invention provides a processor for executing a program, wherein the program executes the control method of the refrigeration system described above.

Therefore, in the scheme of the invention, the condenser and the evaporator are respectively provided with more than two liquid separation structures in the defrosting period of the refrigerating system of the refrigeration house, so that the heat exchange areas of the condenser and the evaporator are adjusted; and through the regulation to the fan switching among the refrigerating system, fan frequency under the condition is opened to the fan, and the heat transfer area of condenser and evaporimeter, avoid refrigerating system to appear high-pressure protection and withdraw from the mode of changing frost in advance to, through the heat transfer area of adjusting condenser and evaporimeter, can avoid appearing high-pressure protection, make the change frost more thoroughly.

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 of one embodiment of a method of controlling a refrigeration system of the present invention;

FIG. 2 is a schematic flow chart illustrating an embodiment of a method for controlling a switch unit according to the present invention;

FIG. 3 is a schematic flow chart diagram illustrating one embodiment of a first process for controlling a first fan and a second fan in a method of the present invention;

FIG. 4 is a schematic flow chart diagram illustrating one embodiment of a second process for controlling the first and second fans in the method of the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of a system for preventing high pressure in thermal defrosting of a refrigeration storage unit;

fig. 6 is a schematic flow chart of an embodiment of a control method of a system for preventing high pressure in thermal defrosting of a refrigeration storage 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.

According to an embodiment of the present invention, a method for controlling a refrigeration system 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 system, comprising: the device comprises a first heat exchanger, a second heat exchanger, a liquid separation assembly and a switch unit; the number of the liquid separating components is N, and N is a positive integer; the liquid separating assemblies are arranged on the heat exchange flow paths of the first heat exchanger and the second heat exchanger, so that the first heat exchange flow path of the first heat exchanger is divided into more than two first heat exchange sub-flow paths, and the second heat exchange flow path of the second heat exchanger is divided into more than two second heat exchange sub-flow paths. That is, the first heat exchanger is provided with more than two liquid separation assemblies so as to divide the first heat exchange flow path of the first heat exchanger into more than two first heat exchange sub-flow paths. And more than two liquid separation assemblies are arranged on the second heat exchanger so as to divide a second heat exchange flow path of the second heat exchanger into more than two second heat exchange sub-flow paths. The switch unit can control the on or off of any one of the two or more first heat exchange sub-flow paths and the two or more second heat exchange sub-flow paths. A first heat exchanger, such as a condenser. A second heat exchanger, such as an evaporator. The liquid separating component is a liquid separating structure composed of a liquid separating head and a liquid separating pipeline. The first heat exchange sub-flow path of the first heat exchanger, such as the first flow path and the second flow path. And a second heat exchange sub-flow path, such as a third flow path and a fourth flow path, of the second heat exchanger.

Wherein, divide liquid subassembly, include: the liquid separation device comprises a liquid separation head and pipelines arranged between the liquid separation head and the corresponding heat exchangers. And pipelines between the liquid separation heads and the corresponding heat exchangers form heat exchange sub-flow paths.

Two or more of the first heat exchange sub-flow paths include: a first flow path distributed on both sides of the first heat exchanger, and a second flow path distributed on both sides of the first heat exchanger.

Two or more of the second heat exchange sub-flow paths include: a third flow path distributed on both sides of the second heat exchanger, and a fourth flow path distributed on both sides of the second heat exchanger.

The switching unit includes: valves (e.g., solenoid valves) disposed at the taps of respective ones of the first, second, third, and fourth flow paths, valves disposed between the respective flow paths and a four-way valve of the refrigeration system, and valves disposed between the respective flow paths and respective ones of the first and second heat exchangers.

Fig. 5 is a schematic structural diagram of an embodiment of a system for preventing high pressure in thermal defrosting of a refrigeration storage unit. As shown in fig. 5, the refrigeration system mainly comprises a condenser (such as a finned condenser), an evaporator (such as a finned evaporator), a four-way reversing valve, a liquid reservoir, a steam separator, a sensor, an electromagnetic valve, an electronic expansion valve, a filter, a drying filter, a stop valve, a high-pressure switch, a variable-frequency fan and other components. Sensors such as condensing temperature sensor, environment temperature sensing bulb, low pressure sensor, air suction temperature sensing bulb, exhaust temperature sensing bulb, defrosting temperature sensing bulb, and storehouse temperature sensing bulb. The condenser (such as a finned condenser) and the evaporator (such as a finned evaporator) are both provided with a plurality of liquid separating structures, so that the change control of the heat exchange area is realized. The refrigerating system realizes the high-pressure prevention effect by controlling the frequency of the fan, the opening and closing of the fan, the heat exchange area and the like, and further prevents the system from exiting a defrosting mode in advance.

In the example shown in fig. 5, the condenser is provided with two four liquid separation structures to form a first flow path and a second flow path. The electromagnetic valve is arranged at the pipeline where each liquid separation head is located, for example, the first electromagnetic valve is arranged at the liquid separation head of the first flow path at one side of the condenser, the second electromagnetic valve is arranged at the liquid separation head of the second flow path at one side of the condenser, and the third electromagnetic valve is arranged on the pipeline between the liquid separation head of the second flow path at one side of the condenser and a four-way valve (namely, a four-way reversing valve) of the refrigerating system. The fourth electromagnetic valve is arranged at the liquid separation head of the first flow path at the other side of the condenser, the fifth electromagnetic valve is arranged at the liquid separation head of the second flow path at the other side of the condenser, and the thirteenth electromagnetic valve is arranged on a pipeline between the liquid separation head of the second flow path at the other side of the condenser and a four-way valve (namely a four-way reversing valve) of the refrigerating system. A sixth electromagnetic valve is arranged between a pipeline between the first flow path and the second flow path on the other side of the condenser and a pipeline at the fourth flow path on the one side of the evaporator.

In the example shown in fig. 5, the evaporator is provided with two four liquid separation structures to form a third flow path and a fourth flow path. The solenoid valve is arranged at the pipeline where each liquid separation head is located, for example, an eighth solenoid valve is arranged at the liquid separation head of the third flow path at one side of the evaporator, a ninth solenoid valve is arranged at the liquid separation head of the fourth flow path at one side of the evaporator, and a tenth solenoid valve is arranged on the pipeline between the liquid separation head of the fourth flow path at one side of the evaporator and a four-way valve (namely, a four-way reversing valve) of the refrigerating system. An eleventh electromagnetic valve is arranged at the liquid separation head of the third flow path at the other side of the evaporator, a twelfth electromagnetic valve is arranged at the liquid separation head of the fourth flow path at the other side of the evaporator, and a fourteenth electromagnetic valve is arranged on a pipeline between the liquid separation head of the fourth flow path at the other side of the evaporator and the second electromagnetic valve of the second flow path at the one side of the condenser. And a seventh electromagnetic valve is arranged between a pipeline between the third flow path and the fourth flow path on the other side of the evaporator and a pipeline between the compressors.

The control method of the refrigeration system comprises the following steps: step S110 and step S120.

At step S110, in a refrigeration stage of the refrigeration system, the switch unit is controlled to control the on or off of a corresponding first heat exchange sub-flow path in the two or more first heat exchange sub-flow paths and to control the on or off of a corresponding second heat exchange sub-flow path in the two or more second heat exchange sub-flow paths, so as to adjust the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger.

In some embodiments, in step S110, the switch unit is controlled to control the on or off of corresponding first heat exchange sub-flow paths in the two or more first heat exchange sub-flow paths, and to control the specific process of the on or off of corresponding second heat exchange sub-flow paths in the two or more second heat exchange sub-flow paths, as shown in the following exemplary description.

The following further describes a specific process of controlling the switch unit in step S110 with reference to a schematic flow chart of an embodiment of controlling the switch unit in the method of the present invention shown in fig. 2, including: step S210 to step S230.

Step S210, determining a refrigeration demand of the refrigeration system.

Step S220, determining the ratio of the first heat exchange area of the first heat exchanger to the second heat exchange area of the second heat exchanger according to the refrigeration requirement of the refrigeration system.

Step S230, controlling the switch unit according to a ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger, so as to control the on/off of a corresponding first heat exchange sub-flow path in the more than two first heat exchange sub-flow paths, and control the on/off of a corresponding second heat exchange sub-flow path in the more than two second heat exchange sub-flow paths, thereby adjusting the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger.

Fig. 6 is a schematic flow chart of an embodiment of a control method of a system for preventing high pressure in thermal defrosting of a refrigeration storage unit. In the example shown in fig. 6, the operation of the refrigeration system (i.e. the system for preventing high pressure of the thermal fluorination frost of the refrigerator unit) can be divided into a refrigeration phase and a thermal fluorination frost phase. When the condensation evaporation area occupied by the 4 flow paths is determined to be a certain value, the first flow path: a second flow path: a third flow path: fourth flow path 1: 0.2: 1: one case of 0.2 is taken as an example:

wherein, confirm the condensation evaporation area that 4 flow paths occupy, include: the condensing and evaporating areas occupied by the 4 flow paths are determined by the areas occupied by the flow paths in the two devices, and can be simply understood as the areas occupied by the copper tubes of each flow path in the two devices.

The refrigerating system can realize the condensation area by controlling the opening and closing of the corresponding electromagnetic valve in the refrigeration stage: the evaporation area is 6 kinds of combinations such as (1: 1), (1: 1.2), (1: 1.4), (1.2: 1), (1.2: 1.2) and (1.4: 1).

For example: the solenoid valves corresponding to the 6 combinations in the above embodiments have different opening and closing conditions, and the opening and closing conditions are complex. In a first flow path: a second flow path: a third flow path: fourth flow path 1: 0.2: 1: one case of 0.2 is taken as an example:

(1)1: the solenoid valves 2, 3, 5, 13, 6, 9, 10, 12, 14 are closed, and the other solenoid valves are kept open.

(2)1: 1.2, the solenoid valves 2, 3, 5, 13, 6, 9, 14 are closed, and the other solenoid valves are kept open.

(3) (1: 1.4), the solenoid valves 3, 5, 6, 9 are closed, and the other solenoid valves are kept open.

(4) (1.2: 1), the solenoid valves 2, 13, 6, 12, 14, 9, 10 are closed, and the other solenoid valves are kept open.

(5) (1.2: 1.2), the valves 2, 13, 6, 9 and 14 are closed, and the other solenoid valves are kept open.

(6) (1.4: 1), the solenoid valves 13, 12, 10 are closed, and the other solenoid valves are kept open.

On the contrary, when the refrigerating system is in a defrosting state, the control system controls the reversing of the four-way valve, the roles of the condenser and the evaporator under the 6 conditions are exchanged, the synchronous condensing area and the evaporating area are also exchanged, and at the moment, the refrigerating system performs defrosting through a high-temperature refrigerant, so that the problem of high energy consumption of defrosting of the electric heating element in related schemes is solved.

The invention provides a thermal fluoride defrosting refrigeration system capable of self-matching a condensation area and an evaporation area and a control method thereof. Meanwhile, the principle that the four-way valve turns to perform hot fluorination defrosting is utilized, and the problem of high energy consumption of an electric heating element is avoided. Compared with the defrosting of an electric heating element, the energy-saving effect of the hot fluorination defrosting can be improved by 30-60%.

At step S120, in a defrosting stage of the refrigeration system, under the adjusted first heat exchange area of the first heat exchanger and the adjusted second heat exchange area of the second heat exchanger, according to the current pressure of the refrigeration system, controlling an outdoor fan of the refrigeration system to be turned on or off, and controlling a frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is turned on. The current pressure of the refrigeration system, such as the real-time pressure of the refrigeration system.

The defrosting of the inner machine is not thorough when the high-pressure protection phenomenon appears in the refrigerating system of the refrigeration house and the inner machine exits the defrosting environment in advance, so that the refrigerating effect of the inner machine in the refrigerating stage is poor. Therefore, it is necessary to design a system and a control method, i.e. a high-voltage prevention system and a control method that can automatically match according to different working conditions to prevent high-voltage protection to ensure thorough defrosting.

Like this, this refrigerating system through the switch that adopts the solenoid valve, changes the heat transfer area of condenser and evaporimeter, is aided with the air regulation of two variable frequency fans, can realize better heat transfer ability, can solve common high pressure protection problem among the refrigerating system. Furthermore, according to different evaporation and condensation areas of self-matching, higher refrigerating capacity can be realized, and the refrigerating device is suitable for various different refrigerating requirements. Therefore, the matching degree of the whole set of refrigeration system is flexible, and various refrigeration situations can be realized according to the actual demands of users.

In some embodiments, an outdoor fan of the refrigeration system comprises: a first fan and a second fan.

In step S120, a specific process of controlling the outdoor fan of the refrigeration system to be turned on or off according to the current pressure of the refrigeration system, and controlling the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is turned on includes: a first process of controlling the first fan and the second fan.

The following further describes, with reference to a schematic flow chart of an embodiment of a first process for controlling a first fan and a second fan in the method of the present invention shown in fig. 3, a specific process of the first process for controlling the first fan and the second fan, including: step S310 to step S330.

And S310, controlling the frequency of the first fan to be reduced in a first rated frequency range under the condition that the current pressure of the refrigeration system is equal to a set value.

Step S320, when the frequency of the first fan is reduced to a first set frequency within the first rated frequency range, if the current pressure of the refrigeration system is less than the set value, controlling the frequency of the first fan to be maintained at the first set frequency for defrosting.

Step S330, in a case that the frequency of the first fan is reduced to a lower limit of the first rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, controlling the frequency of the second fan to be reduced in a second rated frequency range.

Referring to the example shown in fig. 6, first, the high pressure prevention effect is achieved by adjusting the frequency and the on/off of the fan on the external machine side, and it is determined that the real-time pressure P of the refrigeration system reaches the set value P0 when the refrigeration system detects that the real-time pressure P of the refrigeration system reaches the set value P0.

When the real-time pressure P is equal to the set value P0, the control module of the refrigeration system adjusts the frequency f1 of the first fan (i.e., the outdoor fan) on the outside machine side to decrease within the rated frequency range fmin to fmax, so as to decrease the rotation speed of the first fan.

For example: the reduction range of the frequency f1 of the first fan (i.e., the outdoor fan) is a frequency range specified by a fan with a specific specification used in the refrigeration system, and the frequency range corresponding to each fan is generally different.

When the frequency f1 of the first fan reaches a certain frequency fx, if the real-time pressure P is less than the set value P0, the current frequency fx is maintained to operate for defrosting.

When the frequency f1 of the first fan is equal to the lower limit fmin of the rated frequency range of the first fan, if the real-time pressure P is larger than or equal to the set value P0, the control module continues to adjust the frequency f2 of the second fan on the outer machine side to be reduced within the rated frequency range fmin-fmax, and therefore the rotating speed of the second fan is reduced.

The first fan and the second fan have the same function and are used for improving the heat exchange capacity of the refrigerating system. For example, during the cooling phase, the two outdoor units assume the role of condensers. When the first fan and the second fan rotate, the heat of the condenser is discharged at an accelerated speed, and the heat exchange capacity of the condenser is improved. The fan is arranged on the outer side of the refrigerating system under normal conditions.

The frequency f2 of the second fan on the outside machine side is reduced in a range that varies within the frequency range of the fan of a specific specification, and fans of different specifications have different frequency variation ranges. For example, the fan used in a product has a frequency specification of 15 to 70Hz, and thus the reduction range is 70 to 15 Hz to 55 Hz.

In some embodiments, the specific process of controlling the outdoor fan of the refrigeration system to be turned on or off according to the current pressure of the refrigeration system and controlling the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is turned on in step S120 further includes: and a second process of controlling the first fan and the second fan.

The following further describes, with reference to a flowchart of an embodiment of a second process for controlling the first fan and the second fan in the method of the present invention shown in fig. 4, a specific process of the second process for controlling the first fan and the second fan, including: step S410 to step S440.

Step S410, after controlling the frequency of the second fan to decrease within a second rated frequency range, if the current pressure of the refrigeration system is less than the set value, controlling the frequency of the first fan to maintain at a lower limit of the first rated frequency range and controlling the frequency of the second fan to maintain at a first set frequency within the second rated frequency range for defrosting, when the frequency of the second fan decreases to the second set frequency within the second rated frequency range.

Step S420, if the current pressure of the refrigeration system is greater than or equal to the set value, the first fan is controlled to be turned off when the frequency of the first fan is maintained at the lower limit of the first rated frequency range and the frequency of the second fan is reduced to the lower limit of the second rated frequency range.

And step S430, under the condition that the first fan is turned off, and under the condition that the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is smaller than the set value, controlling the refrigeration system to maintain the current state for defrosting.

Step S440, in a case that the first fan is turned off, and in a case that the frequency of the second fan is reduced to a lower limit of the second rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, controlling the second fan to be turned off.

Referring to the example shown in fig. 6, after the frequency f2 of the second fan on the external machine side is adjusted to be reduced within the rated frequency range fmin to fmax, so as to reduce the rotation speed of the second fan, when the frequency f2 of the second fan reaches a certain frequency value fy, if the real-time pressure P < the set value P0, the operation is maintained such that the current frequency f1 of the first fan is equal to the lower limit fmin of the rated frequency range of the first fan, and the current frequency f2 of the second fan is equal to one frequency fy of the rated frequency range of the second fan, so as to defrost.

When the frequency f1 of the first fan is equal to the lower limit fmin of the rated frequency range of the first fan and the frequency f2 of the second fan is equal to the lower limit fmin of the rated frequency range of the second fan, if the real-time pressure P is greater than or equal to the set value P0, the control module directly turns off the first fan.

When the frequency f2 of the first fan and the second fan is turned off is equal to the lower limit fmin of the rated frequency range of the second fan, if the real-time pressure P is less than the set value P0, the current matching condition is maintained, and defrosting is performed.

When the frequency f2 of the first fan and the second fan is turned off is equal to the lower limit fmin of the rated frequency range of the second fan, if the real-time pressure P is larger than or equal to the set value P0, the control module continues to turn off the second fan.

In some embodiments, the specific process of controlling the outdoor fan of the refrigeration system to be turned on or off according to the current pressure of the refrigeration system in step S120, and controlling the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is turned on further includes any one of the following control cases:

the first control case: and under the condition that the first fan and the second fan are both closed, if the current pressure of the refrigeration system is smaller than the set value, controlling the refrigeration system to maintain the current state for defrosting.

The second control case: under the condition that the first fan and the second fan are both closed, if the current pressure of the refrigeration system is greater than or equal to the set value, readjusting the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger, that is, controlling the switch unit again to control the on or off of a corresponding first heat exchange sub-flow path in the more than two first heat exchange sub-flow paths again and to control the on or off of a corresponding second heat exchange sub-flow path in the more than two second heat exchange sub-flow paths again, so as to readjust the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger. And controlling the refrigeration system to continuously defrost under the readjusted first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger.

Referring to the example shown in fig. 6, when the first fan and the second fan are turned off, if the real-time pressure P is less than the set value P0, the current collocation is maintained for defrosting. When the first fan and the second fan are closed, if the real-time pressure P is larger than or equal to the set value P0, the heat exchange area is continuously adjusted to control the heat exchange capacity of the outer machine, and at the moment, the second step of control logic is carried out.

The second step of control is mainly to control the heat exchange area of the external unit. When the first fan and the second fan are closed, if the real-time pressure P is larger than or equal to the set value P0, the corresponding electromagnetic valve is closed to adjust the heat exchange area of the outer machine side, so that the heat exchange capacity of the inner machine and the heat exchange capacity of the outer machine are balanced.

For example, with the first flow path: a second flow path: a third flow path: fourth flow path 1: 0.2: 1: 0.2, when the external machine side: the current heat exchange area ratio of the inner machine side is 1.2: 1.2, real-time pressure P in the refrigerating system is not less than a set value P0, and the second electromagnetic valve, the third electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve, the thirteenth electromagnetic valve and the fourteenth electromagnetic valve are closed to realize the external machine side on the premise of closing the first fan and the second fan on the external machine side: the heat exchange area ratio of the inner machine side is 1: 1.2, the system pressure can be effectively reduced, and the real-time pressure P is less than the set value P0.

In some embodiments, further comprising: after controlling the opening or closing of an outdoor fan of the refrigeration system and controlling the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is opened, determining defrosting parameters of a defrosting stage of the refrigeration system and determining optimal defrosting parameters in the defrosting parameters of the defrosting stage of the refrigeration system so as to defrost according to the optimal defrosting parameters when entering the defrosting stage again.

Wherein the parameters of the defrosting parameters and the optimized defrosting parameters comprise at least one of the following parameters:

the ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger, the opening and closing condition of the outdoor fan, the frequency of the outdoor fan under the opening condition, and the defrosting time of the refrigerating system.

Referring to the example shown in fig. 6, on the basis of the first two steps, the control system keeps the combination and matching of the current heat exchange area, the fan frequency and the on-off state, and records the defrosting time required under the current working condition and matching. Therefore, when the system enters a second defrosting period, the control system directly performs defrosting according to the optimal matching of the first defrosting record, and the defrosting environment is quitted after the recorded defrosting time is reached. Therefore, the optimal matching is found through the first defrosting, namely the defrosting after the first defrosting directly enters the optimal matching, so that the problem that the defrosting is exited in advance due to high-pressure protection during the defrosting of the system under various working conditions can be prevented quickly and effectively.

In the scheme of the invention, when the refrigerating system of the refrigeration house detects that the high pressure of the refrigerating system of the refrigeration house reaches a certain value in the hot fluorination defrosting period, the system automatically follows the high pressure by controlling the rotating speed of the fan, the opening and closing of the electromagnetic valve and the like, thereby realizing the effect of preventing the high pressure. Therefore, during defrosting, the high-voltage prevention control logic can avoid the problem that the system exits defrosting in advance due to high system voltage. During the hot fluorination frost, control logic is provided to control the system against high pressure. During defrosting of the refrigeration house unit, the inner machine bears the angular dispersion heat productivity of the condenser. In order to avoid the heat that the interior machine gived off to cause the freezer temperature to rise in a large number gets into the freezer, the fan of interior machine does not operate this moment. However, when the fan does not operate, the heat exchange capability of the internal machine is poor, and the problem that the system exits defrosting in advance due to high-voltage protection is easy to occur. In order to avoid the high pressure problem of the refrigerating system, the refrigerating system finds out the optimal matching under the current working condition according to the sequence of the control fan, the electromagnetic valve and the defrosting time under different working conditions to defrost.

Through a large amount of tests verification, adopt the technical scheme of this embodiment, through in the refrigeration system's of freezer defrosting period, set up two above liquid separating structures with condenser and evaporimeter respectively to the realization is to the regulation of the heat transfer area of condenser and evaporimeter. And through the regulation to the fan switching among the refrigerating system, fan frequency under the condition is opened to the fan, and the heat transfer area of condenser and evaporimeter, avoid refrigerating system to appear high-pressure protection and withdraw from the mode of changing frost in advance to, through the heat transfer area of adjusting condenser and evaporimeter, can avoid appearing high-pressure protection, make the change frost more thoroughly.

According to the embodiment of the invention, a control device of the refrigeration system corresponding to the control method of the refrigeration system is also provided. The refrigeration system, comprising: the liquid separation device comprises a first heat exchanger, a second heat exchanger, a liquid separation assembly and a switch unit. The number of the liquid separating components is N, and N is a positive integer. The liquid separating assemblies are arranged on the heat exchange flow paths of the first heat exchanger and the second heat exchanger, so that the first heat exchange flow path of the first heat exchanger is divided into more than two first heat exchange sub-flow paths, and the second heat exchange flow path of the second heat exchanger is divided into more than two second heat exchange sub-flow paths. That is, the first heat exchanger is provided with more than two liquid separation assemblies so as to divide the first heat exchange flow path of the first heat exchanger into more than two first heat exchange sub-flow paths. And more than two liquid separation assemblies are arranged on the second heat exchanger so as to divide a second heat exchange flow path of the second heat exchanger into more than two second heat exchange sub-flow paths. The switch unit can control the on or off of any one of the two or more first heat exchange sub-flow paths and the two or more second heat exchange sub-flow paths. A first heat exchanger, such as a condenser. A second heat exchanger, such as an evaporator. The liquid separating component is a liquid separating structure composed of a liquid separating head and a liquid separating pipeline. The first heat exchange sub-flow path of the first heat exchanger, such as the first flow path and the second flow path. And a second heat exchange sub-flow path of the second heat exchanger, such as a third flow path and a fourth flow path.

Fig. 5 is a schematic structural diagram of an embodiment of a system for preventing high pressure of thermal defrosting of a refrigeration storage unit. As shown in fig. 5, the refrigeration system mainly comprises a condenser (such as a finned condenser), an evaporator (such as a finned evaporator), a four-way reversing valve, a liquid reservoir, a steam separator, a sensor, an electromagnetic valve, an electronic expansion valve, a filter, a drying filter, a stop valve, a high-pressure switch, a variable-frequency fan and other components. Sensors such as condensing temperature sensor, environment temperature sensing bulb, low pressure sensor, air suction temperature sensing bulb, exhaust temperature sensing bulb, defrosting temperature sensing bulb, and storehouse temperature sensing bulb. The condenser (such as a finned condenser) and the evaporator (such as a finned evaporator) are both provided with a plurality of liquid separating structures, so that the change control of the heat exchange area is realized. The refrigerating system realizes the high-pressure prevention effect by controlling the frequency of the fan, the opening and closing of the fan, the heat exchange area and the like, and further prevents the system from exiting a defrosting mode in advance.

The control device of the refrigeration system comprises: a control unit.

The control unit is configured to control the switch unit to control the on or off of a corresponding first heat exchange sub-flow path in the two or more first heat exchange sub-flow paths and control the on or off of a corresponding second heat exchange sub-flow path in the two or more second heat exchange sub-flow paths in a refrigeration stage of the refrigeration system, so as to adjust the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger. The specific function and processing of the control unit are referred to in step S110.

In some embodiments, the control unit controls the switch unit to control on or off of a corresponding first heat exchange sub-flow path in the two or more first heat exchange sub-flow paths and to control on or off of a corresponding second heat exchange sub-flow path in the two or more second heat exchange sub-flow paths, and the control unit includes:

the control unit is specifically further configured to determine a refrigeration demand of the refrigeration system. The specific functions and processes of the control unit are also referred to in step S210.

The control unit is specifically further configured to determine a ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger according to a refrigeration demand of the refrigeration system. The specific function and processing of the control unit are also referred to in step S220.

The control unit is specifically configured to control the switch unit according to a ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger, so as to control on or off of corresponding first heat exchange sub-flow paths in the two or more first heat exchange sub-flow paths, and control on or off of corresponding second heat exchange sub-flow paths in the two or more second heat exchange sub-flow paths, so as to adjust the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger. The specific function and processing of the control unit are also referred to in step S230.

Fig. 6 is a schematic flow chart of an embodiment of a control device for a system for preventing high pressure of thermal defrosting of a refrigeration storage unit. In the example shown in fig. 6, the operation of the refrigeration system (i.e. the system for preventing high pressure of the thermal fluorination frost of the refrigerator unit) can be divided into a refrigeration phase and a thermal fluorination frost phase. When the condensation evaporation area occupied by the 4 flow paths is determined to be a certain value, the first flow path: a second flow path: a third flow path: fourth flow path 1: 0.2: 1: one case of 0.2 is taken as an example:

The invention provides a thermal fluoride frost refrigerating system and a control device capable of automatically matching a condensation area and an evaporation area. Meanwhile, the principle of hot fluorination and defrosting by utilizing the turning of the four-way valve is utilized, so that the problem of high energy consumption of an electric heating element is avoided. Compared with the defrosting of an electric heating element, the energy-saving effect of the hot fluorination defrosting can be improved by 30-60%.

The control unit is further configured to control the opening or closing of an outdoor fan of the refrigeration system according to the current pressure of the refrigeration system in the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger after adjustment in a defrosting stage of the refrigeration system, and control the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is opened. The current pressure of the refrigeration system, such as the real-time pressure of the refrigeration system. The specific function and processing of the control unit are also referred to in step S120.

The defrosting of the inner machine is not thorough when the high-pressure protection phenomenon appears in the refrigerating system of the refrigeration house and the inner machine exits the defrosting environment in advance, so that the refrigerating effect of the inner machine in the refrigerating stage is poor. Therefore, it is necessary to design a system and a control device, i.e. a high-voltage prevention system and a control device that can automatically match according to different working conditions to prevent high-voltage protection to ensure thorough defrosting.

The control unit controls the opening or closing of an outdoor fan of the refrigeration system according to the current pressure of the refrigeration system, and controls the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is opened, and the control unit comprises:

the control unit is specifically further configured to control the frequency of the first fan to decrease within a first rated frequency range when the current pressure of the refrigeration system is equal to a set value. The specific function and processing of the control unit are also referred to step S310.

The control unit is specifically further configured to, in a case where the frequency of the first fan is reduced to a first set frequency within the first rated frequency range, control the frequency of the first fan to be maintained at the first set frequency for defrosting if the current pressure of the refrigeration system is less than the set value. The specific functions and processes of the control unit are also referred to in step S320.

The control unit is specifically further configured to, when the frequency of the first fan is reduced to a lower limit of the first rated frequency range, control the frequency of the second fan to be reduced within a second rated frequency range if the current pressure of the refrigeration system is greater than or equal to the set value. The specific function and processing of the control unit are also referred to in step S330.

In some embodiments, the control unit controls the outdoor fan of the refrigeration system to be turned on or off according to the current pressure of the refrigeration system, and controls the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is turned on, further comprising:

the control unit is specifically configured to, after controlling the frequency of the second fan to decrease within a second rated frequency range, control the frequency of the first fan to be maintained at a lower limit of the first rated frequency range and control the frequency of the second fan to be maintained at a first set frequency within the second rated frequency range for defrosting if the current pressure of the refrigeration system is less than the set value in a case where the frequency of the second fan is decreased to a second set frequency within the second rated frequency range. The specific functions and processes of the control unit are also referred to in step S410.

The control unit is specifically further configured to control the first fan to be turned off if the current pressure of the refrigeration system is greater than or equal to the set value, when the frequency of the first fan is maintained at the lower limit of the first rated frequency range and the frequency of the second fan is reduced to the lower limit of the second rated frequency range. The specific function and processing of the control unit are also referred to in step S420.

The control unit is specifically further configured to, when the first fan is turned off, control the refrigeration system to maintain a current state for defrosting if the current pressure of the refrigeration system is less than the set value when the frequency of the second fan is reduced to a lower limit of the second rated frequency range. The specific functions and processes of the control unit are also referred to in step S430.

The control unit is specifically further configured to, when the first fan is turned off, control the second fan to be turned off if the current pressure of the refrigeration system is greater than or equal to the set value when the frequency of the second fan is reduced to the lower limit of the second rated frequency range. The specific functions and processes of the control unit are also referred to in step S440.

When the frequency f2 of the first fan and the second fan is turned off is equal to the lower limit fmin of the rated frequency range of the second fan, if the real-time pressure P is less than the set value P0, the current matching condition is maintained, and defrosting is carried out.

In some embodiments, the control unit controls the outdoor fan of the refrigeration system to be turned on or off according to the current pressure of the refrigeration system, and controls the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is turned on, and further includes any one of the following control conditions:

the first control case: the control unit is specifically configured to, when both the first fan and the second fan are turned off, control the refrigeration system to maintain a current state for defrosting if the current pressure of the refrigeration system is less than the set value.

The second control case: the control unit is specifically configured to, when the first fan and the second fan are both turned off, readjust the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger if the current pressure of the refrigeration system is greater than or equal to the set value, that is, control the switch unit again to control the on or off of a corresponding first heat exchange sub-flow path in the two or more first heat exchange sub-flow paths again and to control the on or off of a corresponding second heat exchange sub-flow path in the two or more second heat exchange sub-flow paths again, so as to readjust the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger. And controlling the refrigeration system to continuously defrost under the readjusted first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger.

In some embodiments, further comprising: the control unit is further configured to determine defrosting parameters of a defrosting stage of the refrigeration system and determine an optimal defrosting parameter of the defrosting parameters of the defrosting stage of the refrigeration system after controlling the on or off of an outdoor fan of the refrigeration system and controlling the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is on, so as to defrost according to the optimal defrosting parameters when entering the defrosting stage again.

Wherein, the parameters in the defrosting parameters and the optimized defrosting parameters comprise at least one of the following parameters:

Referring to the example shown in fig. 6, on the basis of the first two steps, the control system keeps the combination and matching of the current heat exchange area, the fan frequency and the on-off state, and records the defrosting time required under the current working condition and matching. Therefore, when the system enters a second defrosting period, the control system directly carries out defrosting according to the optimal matching of the first defrosting record, and the defrosting environment is exited after the recorded defrosting time is reached. Therefore, the optimal matching is found through the first defrosting, namely the defrosting after the first defrosting directly enters the optimal matching, so that the problem that the defrosting is exited in advance due to high-pressure protection during the defrosting of the system under various working conditions can be prevented quickly and effectively.

In the scheme of the invention, when the refrigerating system of the refrigeration house detects that the high pressure of the refrigerating system of the refrigeration house reaches a certain value in the hot fluorination defrosting period, the system automatically follows the high pressure by controlling the rotating speed of the fan, the opening and closing of the electromagnetic valve and the like, thereby realizing the effect of preventing the high pressure. Therefore, during defrosting, the high-voltage prevention control logic can avoid the problem that the system exits defrosting in advance due to high system voltage. During the hot fluorination frost, control logic is provided to control the system against high pressure. During defrosting of the refrigeration house unit, the inner machine bears the angular dispersion heat productivity of the condenser. For the heat that avoids the interior machine to give off causes the freezer temperature to rise in getting into the freezer in a large number, the fan of interior machine does not operate this moment. However, when the fan does not operate, the heat exchange capability of the internal machine is poor, and the problem that the system exits defrosting in advance due to high-voltage protection is easy to occur. In order to avoid the high pressure problem of the refrigerating system, the refrigerating system finds out the optimal matching under the current working condition according to the sequence of the control fan, the electromagnetic valve and the defrosting time under different working conditions to defrost.

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.

Through a large number of tests, the technical scheme of the invention is adopted, and the condenser and the evaporator are respectively provided with more than two liquid separating structures in the defrosting period of the refrigerating system of the refrigeration house, so that the heat exchange areas of the condenser and the evaporator are adjusted; and through the regulation to fan switching, fan frequency under the fan condition of opening and close among the refrigerating system and the heat transfer area of condenser and evaporimeter, avoid refrigerating system to appear high-pressure protection and withdraw from the mode of changing frost in advance, can be quick effectual prevent under various operating modes that the system changes frost the period and withdraw from the problem of changing frost in advance because of high-pressure protection.

According to an embodiment of the invention, a refrigeration system corresponding to a control device of the refrigeration system is also provided. The refrigeration system may include: the control device of the refrigeration system described above.

Since the processes and functions of the refrigeration system 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.

Through a large number of tests, the technical scheme of the invention is adopted, and the condenser and the evaporator are respectively provided with more than two liquid separating structures in the defrosting period of the refrigerating system of the refrigeration house, so that the heat exchange areas of the condenser and the evaporator are adjusted; and the condition that a fan in the refrigeration system is opened and closed, the fan frequency under the condition that the fan is opened and the heat exchange areas of the condenser and the evaporator are adjusted, so that the refrigeration system is prevented from exiting a defrosting mode in advance due to high-pressure protection, and the problem that the system exits defrosting in advance due to high pressure of the system can be avoided.

According to an embodiment of the present invention, there is also provided a storage medium corresponding to a control method of a refrigeration system, 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 system described above.

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.

Through a large number of tests, the technical scheme of the invention is adopted, and the condenser and the evaporator are respectively provided with more than two liquid separating structures in the defrosting period of the refrigerating system of the refrigeration house, so that the heat exchange areas of the condenser and the evaporator are adjusted; and through the regulation to the fan switching in refrigerating system, fan frequency under the fan condition of opening and close, and the heat transfer area of condenser and evaporimeter, avoid refrigerating system to appear high-pressure protection and withdraw from the mode of defrosting in advance, can realize better heat transfer ability, can solve common high-pressure protection problem among the refrigerating system.

According to an embodiment of the present invention, there is also provided a processor corresponding to a control method of a refrigeration system, the processor being configured to run a program, wherein the program is run to execute the control method of the refrigeration system described above.

Since the processing and functions implemented by the processor 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.

Through a large number of tests, the technical scheme of the invention is adopted, and the condenser and the evaporator are respectively provided with more than two liquid separating structures in the defrosting period of the refrigerating system of the refrigeration house, so that the heat exchange areas of the condenser and the evaporator are adjusted; and through the regulation to the fan switching in refrigerating system, fan frequency under the fan condition of opening and close, and the heat transfer area of condenser and evaporimeter, avoid refrigerating system to appear high-pressure protection and withdraw from the mode of changing frost in advance, can prevent high-pressure protection to ensure that the defrosting is thorough.

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

1. A control method for a refrigeration system, characterized in that the refrigeration system comprises: the device comprises a first heat exchanger, a second heat exchanger, a liquid separation assembly and a switch unit; the number of the liquid separating components is N, and N is a positive integer; the liquid separation assemblies are arranged on the heat exchange flow paths of the first heat exchanger and the second heat exchanger so as to divide a first heat exchange flow path of the first heat exchanger into more than two first heat exchange sub-flow paths and divide a second heat exchange flow path of the second heat exchanger into more than two second heat exchange sub-flow paths; the switch unit can control the on or off of any one of the two or more first heat exchange sub-flow paths and the two or more second heat exchange sub-flow paths;

the control method of the refrigeration system comprises the following steps:

in a refrigeration stage of the refrigeration system, controlling the switch unit to control the on or off of a corresponding first heat exchange sub-flow path in the two or more first heat exchange sub-flow paths and to control the on or off of a corresponding second heat exchange sub-flow path in the two or more second heat exchange sub-flow paths includes: determining a refrigeration demand of the refrigeration system; determining the ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger according to the refrigeration demand of the refrigeration system; controlling the switch unit according to the ratio of the first heat exchange area of the first heat exchanger to the second heat exchange area of the second heat exchanger to control the on or off of a corresponding first heat exchange sub-flow path in the more than two first heat exchange sub-flow paths and the on or off of a corresponding second heat exchange sub-flow path in the more than two second heat exchange sub-flow paths, so as to realize the adjustment of the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger;

in the defrosting stage of the refrigerating system, under the adjusted first heat exchange area of the first heat exchanger and the adjusted second heat exchange area of the second heat exchanger, the opening or closing of an outdoor fan of the refrigerating system is controlled according to the current pressure of the refrigerating system, and the frequency of the outdoor fan of the refrigerating system is controlled under the condition that the outdoor fan of the refrigerating system is opened.

2. The control method of a refrigeration system according to claim 1, wherein,

the divide liquid subassembly includes: the liquid separation head and the pipeline are arranged between the liquid separation head and the corresponding heat exchanger; the pipelines between the liquid separation heads and the corresponding heat exchangers form heat exchange sub-flow paths;

two or more of the first heat exchange sub-flow paths include: a first flow path distributed on both sides of the first heat exchanger, and a second flow path distributed on both sides of the first heat exchanger;

two or more of the second heat exchange sub-flow paths include: a third flow path distributed on both sides of the second heat exchanger, and a fourth flow path distributed on both sides of the second heat exchanger;

the switching unit includes: valves disposed at taps of respective ones of the first, second, third, and fourth flow paths, valves disposed between the respective flow paths and a four-way valve of the refrigeration system, and valves disposed between the respective flow paths and respective ones of the first and second heat exchangers.

3. The control method of a refrigeration system according to claim 1 or 2, wherein the outdoor fan of the refrigeration system includes: a first fan and a second fan;

controlling the opening or closing of an outdoor fan of the refrigeration system according to the current pressure of the refrigeration system, and controlling the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is opened, wherein the method comprises the following steps:

controlling the frequency of the first fan to be reduced within a first rated frequency range under the condition that the current pressure of the refrigeration system is equal to a set value;

under the condition that the frequency of the first fan is reduced to a first set frequency within the first rated frequency range, if the current pressure of the refrigeration system is smaller than the set value, controlling the frequency of the first fan to be maintained at the first set frequency for defrosting;

and under the condition that the frequency of the first fan is reduced to the lower limit of the first rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, controlling the frequency of the second fan to be reduced in a second rated frequency range.

4. The control method of a refrigeration system according to claim 3, wherein the turning on or off of an outdoor fan of the refrigeration system is controlled according to a current pressure of the refrigeration system, and the frequency of the outdoor fan of the refrigeration system is controlled in a case where the outdoor fan of the refrigeration system is turned on, further comprising:

after controlling the frequency of the second fan to be reduced in a second rated frequency range, if the current pressure of the refrigeration system is lower than the set value under the condition that the frequency of the second fan is reduced to a second set frequency in the second rated frequency range, controlling the frequency of the first fan to be maintained at the lower limit of the first rated frequency range and controlling the frequency of the second fan to be maintained at a first set frequency in the second rated frequency range for defrosting;

under the condition that the frequency of the first fan is maintained at the lower limit of the first rated frequency range and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, the first fan is controlled to be turned off;

under the condition that the first fan is turned off and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is smaller than the set value, the refrigeration system is controlled to maintain the current state for defrosting;

and under the condition that the first fan is turned off and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, the second fan is controlled to be turned off.

5. The control method of a refrigeration system according to claim 3, wherein the turning on or off of an outdoor fan of the refrigeration system is controlled according to a current pressure of the refrigeration system, and the frequency of the outdoor fan of the refrigeration system is controlled in a case where the outdoor fan of the refrigeration system is turned on, further comprising:

under the condition that the first fan and the second fan are both closed, if the current pressure of the refrigeration system is smaller than the set value, controlling the refrigeration system to maintain the current state for defrosting;

and under the condition that the first fan and the second fan are both closed, if the current pressure of the refrigeration system is greater than or equal to the set value, readjusting the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger, and controlling the refrigeration system to continue defrosting under the readjusted first heat exchange area of the first heat exchanger and the readjusted second heat exchange area of the second heat exchanger.

6. The control method of a refrigeration system according to claim 1 or 2, characterized by further comprising:

after controlling the opening or closing of an outdoor fan of the refrigeration system and controlling the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is opened, determining defrosting parameters of a defrosting stage of the refrigeration system and determining optimal defrosting parameters in the defrosting parameters of the defrosting stage of the refrigeration system so as to defrost according to the optimal defrosting parameters when entering the defrosting stage again;

7. A control device for a refrigeration system, the refrigeration system comprising: the device comprises a first heat exchanger, a second heat exchanger, a liquid separation assembly and a switch unit; the number of the liquid separating components is N, and N is a positive integer; the liquid separation assemblies are arranged on the heat exchange flow paths of the first heat exchanger and the second heat exchanger so as to divide a first heat exchange flow path of the first heat exchanger into more than two first heat exchange sub-flow paths and divide a second heat exchange flow path of the second heat exchanger into more than two second heat exchange sub-flow paths; the switch unit can control the on or off of any one of the two or more first heat exchange sub-flow paths and the two or more second heat exchange sub-flow paths;

the control device of the refrigeration system comprises:

a control unit configured to control the switch unit to control the on or off of a corresponding first heat exchange sub-flow path in the two or more first heat exchange sub-flow paths and to control the on or off of a corresponding second heat exchange sub-flow path in the two or more second heat exchange sub-flow paths during a refrigeration phase of the refrigeration system, including: determining a refrigeration demand of the refrigeration system; determining the ratio of a first heat exchange area of the first heat exchanger to a second heat exchange area of the second heat exchanger according to the refrigeration demand of the refrigeration system; controlling the switch unit according to the ratio of the first heat exchange area of the first heat exchanger to the second heat exchange area of the second heat exchanger to control the on or off of a corresponding first heat exchange sub-flow path in the more than two first heat exchange sub-flow paths and the on or off of a corresponding second heat exchange sub-flow path in the more than two second heat exchange sub-flow paths, so as to realize the adjustment of the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger;

the control unit is further configured to control the opening or closing of an outdoor fan of the refrigeration system according to the current pressure of the refrigeration system in the first heat exchange area of the first heat exchanger and the second heat exchange area of the second heat exchanger after adjustment in a defrosting stage of the refrigeration system, and control the frequency of the outdoor fan of the refrigeration system when the outdoor fan of the refrigeration system is opened.

8. The control device of a refrigeration system according to claim 7, wherein,

9. The control device for a refrigeration system according to claim 7 or 8, wherein the outdoor fan of the refrigeration system comprises: a first fan and a second fan;

the control unit controls the opening or closing of an outdoor fan of the refrigeration system according to the current pressure of the refrigeration system, and controls the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is opened, and the control method comprises the following steps:

10. The control device of a refrigeration system according to claim 9, wherein the control unit controls the outdoor fan of the refrigeration system to be turned on or off according to the current pressure of the refrigeration system, and controls the frequency of the outdoor fan of the refrigeration system in a case where the outdoor fan of the refrigeration system is turned on, further comprising:

and under the condition that the first fan is turned off and the frequency of the second fan is reduced to the lower limit of the second rated frequency range, if the current pressure of the refrigeration system is greater than or equal to the set value, controlling the second fan to be turned off.

11. The control device of a refrigeration system according to claim 9, wherein the control unit controls the outdoor fan of the refrigeration system to be turned on or off according to the current pressure of the refrigeration system, and controls the frequency of the outdoor fan of the refrigeration system in a case where the outdoor fan of the refrigeration system is turned on, further comprising:

12. The control device of the refrigeration system according to claim 7 or 8, further comprising:

the control unit is further configured to determine defrosting parameters of a defrosting stage of the refrigeration system and determine an optimal defrosting parameter of the defrosting parameters of the defrosting stage of the refrigeration system after controlling the on or off of an outdoor fan of the refrigeration system and controlling the frequency of the outdoor fan of the refrigeration system under the condition that the outdoor fan of the refrigeration system is on, so as to defrost according to the optimal defrosting parameters when entering the defrosting stage again;

13. A refrigeration system, comprising: a control device for a refrigeration system according to any of claims 7 to 12.

14. A storage medium characterized by comprising a stored program, wherein an apparatus in which the storage medium is located is controlled to execute the control method of the refrigeration system according to any one of claims 1 to 6 when the program is executed.

15. A processor, characterized in that the processor is configured to run a program, wherein the program is run to execute the control method of the refrigeration system according to any one of claims 1 to 6.