A refrigeration unit control method, device and system

Abstract

The present invention relates to the field of intelligent control technology, and specifically to a refrigeration unit control method, device and system, the method comprising: obtaining the exhaust pressure and suction pressure of the refrigeration unit in real time, calculating the real-time pressure ratio according to the exhaust pressure and the suction pressure; and controlling the condenser flow path of the refrigeration unit according to the real-time pressure ratio and the preset range of the real-time pressure ratio. It can be understood that the technical solution provided by the present invention can automatically adjust the condenser flow path and change the condensation area, so that the refrigeration unit can reduce the pressure ratio by increasing the condenser flow path under high temperature and high pressure ratio conditions, and the unit can start and refrigerate normally; under low temperature and low pressure ratio conditions, the pressure ratio can be increased by reducing the condenser flow path, and the unit can start and refrigerate normally.

Description

Technical Field

[0001] The present invention relates to the field of intelligent control technology, and in particular to a refrigeration unit control method, device and system. Background Art

[0002] At present, with the advancement of science and technology, the climate environment is no longer sufficient to limit the growing needs of people's lives. Refrigeration units can adjust the temperature inside a certain space and can be used in places that need to adjust the temperature, such as greenhouses and storage warehouses. Taking greenhouses as an example, greenhouses can increase the frequency of planting, increase the economic income of growers, and provide people with a richer variety of fruits and vegetables. The most critical device is the refrigeration unit.

[0003] However, current refrigeration units are in high-pressure ratio conditions in the summer when in high-temperature environments, and are prone to startup failures, resulting in untimely refrigeration and large fluctuations in storage temperature. In the winter when in low-temperature environments, the temperature is too low and the unit's condensing pressure is too low to start.

[0004] Therefore, the current refrigeration units may fail to start normally when the temperature of the operating environment is relatively harsh, affecting the user experience. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a refrigeration unit control method, device and system to solve the problem that the refrigeration unit in the prior art cannot be started normally when the temperature of the operating environment is relatively harsh.

[0006] According to a first aspect of an embodiment of the present invention, a refrigeration unit control method is provided, comprising:

[0007] Acquire the exhaust pressure and suction pressure of the refrigeration unit in real time, and calculate the real-time pressure ratio according to the exhaust pressure and the suction pressure;

[0008] The condenser flow path of the refrigeration unit is controlled according to the real-time pressure ratio and a preset range of the real-time pressure ratio.

[0009] Preferably, controlling the condenser flow path of the refrigeration unit according to the real-time pressure ratio and the preset range of the real-time pressure ratio includes:

[0010] If the real-time pressure ratio is within a preset range, controlling the condenser flow path and the evaporator flow path of the refrigeration unit to operate at a first ratio;

[0011] If the real-time pressure ratio is greater than or equal to the maximum value of the preset range, increase the condenser flow path until the real-time pressure ratio is within the preset range;

[0012] If the real-time pressure ratio is less than or equal to a minimum value within a preset range, the condenser flow path is reduced until the real-time pressure ratio is within a preset range.

[0013] Preferably, the controlling the condenser flow path and the evaporator flow path of the refrigeration unit to operate at a first ratio further includes:

[0014] Collect the condensation inlet temperature and condensation outlet temperature;

[0015] Subtract the condensation inlet temperature from the preset maximum and minimum condensation inlet temperatures to obtain a condensation inlet temperature difference;

[0016] Subtract the condensation temperature from the preset maximum and minimum condensation temperatures to obtain a condensation temperature difference;

[0017] According to the condensation inlet temperature difference and the condensation outlet temperature difference, adjusting the condenser flow path in real time;

[0018] According to the adjustment of the condenser flow path, the evaporator flow path is adjusted in real time so that the condenser flow path and the evaporator flow path of the refrigeration unit operate at a first ratio.

[0019] Preferably, the method further comprises:

[0020] Collect ambient temperature, storage temperature and cooling time;

[0021] The cooling rate is calculated according to the ambient temperature, the preset target storage temperature and the cooling time;

[0022] Subtract the warehouse temperature from the preset maximum and minimum target warehouse temperatures to obtain a warehouse temperature target difference;

[0023] According to the cooling rate and the target difference in storage temperature, a first ratio of the condenser flow path to the evaporator flow path is obtained.

[0024] Preferably, after adding the condenser flow path, the method further comprises:

[0025] When the condenser flow path reaches an upper limit value, determining whether the real-time pressure ratio is greater than or equal to a maximum value within a preset range;

[0026] If the real-time pressure ratio is greater than or equal to the maximum value of the preset range, the evaporator flow path is increased until the real-time pressure ratio is within the preset range.

[0027] Preferably, after reducing the condenser flow path, the method further comprises:

[0028] When the condenser flow path reaches the lower limit value, determining whether the real-time pressure ratio is less than or equal to the minimum value of the preset range;

[0029] If the real-time pressure ratio is less than or equal to the minimum value of the preset range, the evaporator flow path is reduced until the real-time pressure ratio is within the preset range.

[0030] According to a second aspect of an embodiment of the present invention, there is provided a refrigeration unit control device, comprising:

[0031] A data acquisition and processing module is used to obtain the exhaust pressure and suction pressure of the refrigeration unit in real time, and calculate the real-time pressure ratio according to the exhaust pressure and the suction pressure;

[0032] A flow path control module is used to control the condenser flow path of the refrigeration unit according to the real-time pressure ratio and a preset range of the real-time pressure ratio.

[0033] Preferably, the data acquisition and processing module is further used to collect the condensation inlet temperature and the condensation outlet temperature, and to obtain the condensation inlet temperature difference by subtracting the condensation inlet temperature from the preset maximum and minimum values ​​of the condensation inlet temperature; and to obtain the condensation outlet temperature difference by subtracting the condensation outlet temperature from the preset maximum and minimum values ​​of the condensation outlet temperature;

[0034] The flow control module is also used to adjust the condenser flow in real time according to the condensation inlet temperature difference and the condensation outlet temperature difference; and adjust the evaporator flow in real time according to the adjustment of the condenser flow, so that the condenser flow and the evaporator flow of the refrigeration unit operate at a first ratio.

[0035] Preferably, the data acquisition and processing module is also used to collect ambient temperature, storage temperature and cooling time; calculate the cooling rate according to the ambient temperature, the preset target storage temperature and the cooling time; subtract the storage temperature from the preset target storage temperature maximum and minimum values, respectively, to obtain the storage temperature target difference; and obtain the first ratio of the condenser flow path to the evaporator flow path according to the cooling rate and the storage temperature target difference.

[0036] According to a third aspect of an embodiment of the present invention, there is provided a refrigeration unit control system, comprising:

[0037] A refrigeration unit, the above-mentioned refrigeration unit control device, and an exhaust pressure sensor and a suction pressure sensor respectively connected to the control device;

[0038] The condenser and the evaporator of the refrigeration unit are provided with a preset number of flow paths, and the inlet and the outlet of each flow path are respectively provided with a solenoid valve, and the solenoid valves are electrically connected to the control device.

[0039] The technical solution provided by the embodiments of the present invention may have the following beneficial effects:

[0040] It is understandable that the technical solution provided by the present invention obtains the exhaust pressure and suction pressure of the refrigeration unit in real time, calculates the real-time pressure ratio according to the exhaust pressure and the suction pressure; and controls the condenser flow path of the refrigeration unit according to the preset range of the real-time pressure ratio and the real-time pressure ratio. It is understandable that the technical solution provided by the present invention can automatically adjust the condenser flow path and change the condensation area, so that the refrigeration unit can reduce the pressure ratio by increasing the condenser flow path under high temperature and high pressure ratio conditions, and the unit can start and refrigerate normally; under low temperature and low pressure ratio conditions, the pressure ratio can be increased by reducing the condenser flow path, and the unit can start and refrigerate normally.

[0041] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0043] Figure 1 is a schematic diagram of steps of a refrigeration unit control method according to an exemplary embodiment;

[0044] Figure 2 is a schematic block diagram of a refrigeration unit control device according to an exemplary embodiment;

[0045] Figure 3 is a schematic diagram showing the principle of a refrigeration unit according to an exemplary embodiment;

[0046] Figure 4 is a schematic diagram of a refrigeration unit according to an exemplary embodiment. DETAILED DESCRIPTION

[0047] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0048] Embodiment 1

[0049] Figure 1 is a schematic diagram of steps of a refrigeration unit control method according to an exemplary embodiment, see Figure 1 According to a first aspect of an embodiment of the present invention, a refrigeration unit control method is provided, comprising:

[0050] Step S11, obtaining the exhaust pressure and suction pressure of the refrigeration unit in real time, and calculating the real-time pressure ratio according to the exhaust pressure and the suction pressure;

[0051] Step S12: controlling the condenser flow path of the refrigeration unit according to the real-time pressure ratio and a preset range of the real-time pressure ratio.

[0052] In specific practice, the exhaust pressure and suction pressure of the refrigeration unit can be obtained in real time, and the ratio of the higher pressure to the lower pressure of the exhaust pressure and the suction pressure can be obtained by calculation as the real-time pressure ratio, and the difference between the real-time pressure ratio and the maximum and minimum values ​​of the preset range of the real-time pressure ratio is made. According to the difference, the relationship between the real-time pressure ratio and the preset range can be judged, and then the condenser flow path of the refrigeration unit is controlled. By controlling the condenser flow path, the purpose of regulating the condensation area is achieved, and finally the ratio of the condensation area to the evaporation area is adjusted to achieve stable start and stop of the unit under severe working conditions.

[0053] It is understandable that the technical solution provided in this embodiment obtains the exhaust pressure and suction pressure of the refrigeration unit in real time, calculates the real-time pressure ratio according to the exhaust pressure and the suction pressure; and controls the condenser flow path of the refrigeration unit according to the preset range of the real-time pressure ratio and the real-time pressure ratio. It is understandable that the technical solution provided in this embodiment can automatically adjust the condenser flow path and change the condensation area, so that the refrigeration unit can reduce the pressure ratio by increasing the condenser flow path under high temperature and high pressure ratio conditions, and the unit can start and refrigerate normally; under low temperature and low pressure ratio conditions, the pressure ratio can be increased by reducing the condenser flow path, and the unit can start and refrigerate normally.

[0054] It should be noted that, controlling the condenser flow path of the refrigeration unit according to the real-time pressure ratio and the preset range of the real-time pressure ratio includes:

[0055] If the real-time pressure ratio is within a preset range, controlling the condenser flow path and the evaporator flow path of the refrigeration unit to operate at a first ratio;

[0056] If the real-time pressure ratio is greater than or equal to the maximum value of the preset range, increase the condenser flow path until the real-time pressure ratio is within the preset range;

[0057] If the real-time pressure ratio is less than or equal to a minimum value within a preset range, the condenser flow path is reduced until the real-time pressure ratio is within a preset range.

[0058] In specific practice, assuming that this embodiment is applied to the refrigeration unit in the warehouse, when the goods are stored at high temperature in summer, the equipment is operated under high pressure ratio conditions for a long time, the operating condensing temperature of the unit is as high as 60°C, the evaporation temperature can be as low as -25°C, and the real-time suction and exhaust pressure ratio can reach 11.3. The commonly used refrigerant in the refrigeration unit is R410A. At this time, the theoretical exhaust temperature of R410A refrigerant is 164.3°C, which is far higher than the compressor exhaust safety temperature of 120°C. The compressor will have a built-in protection shutdown and cannot be started or refrigerated normally, causing large fluctuations in the warehouse temperature. Therefore, using the method provided in this embodiment, when the real-time pressure ratio N1 is within its rated pressure ratio range N1 min ~N1 max , the flow control module continues to control the unit flow ratio to the first ratio. Preferably, the first ratio can be manually entered by the staff or set by calculation. At this time, condenser flow: evaporator flow = L1 (X1): L2 (X1), the unit starts refrigeration normally, and when the real-time pressure ratio N1 ≥ the preset range maximum value N1 max When the condenser flow L1(X) is adjusted and controlled to increase until it reaches a certain value L1(X2), the condensing area S2(X) reaches S2(X2) synchronously. At this time, the condenser flow: evaporator flow = L1(X2): L2(X1), N1 min <N1<N1 max , so as to reduce the pressure ratio and start cooling the unit.

[0059] When goods are stored at low temperatures in winter, especially when operating in the north where the ambient temperature is very low, the condensing temperature drops as the ambient temperature drops, and the condensing pressure drops accordingly. The high and low pressure difference of the system decreases, and the flow rate of the system refrigerant slows down, resulting in a decrease in refrigeration capacity and poor refrigeration effect. In addition, the condensing pressure is too low, and the unit is prone to low pressure shutdown. When the real-time pressure ratio N1 is within its rated pressure ratio range N1 min ~N1 max , the flow control module continues to control the unit flow ratio to the first ratio, assuming that the condenser flow: evaporator flow

[0060] =L1(X1):L2(X1), the unit starts cooling normally; when the real-time pressure ratio N1≤the minimum value N1 within the preset range min When the condenser flow L1(X) is adjusted and controlled to decrease until it reaches a certain value L1(X0), at which time the condensing area S1(X) reaches the corresponding value S1(X0) synchronously. At this time, the condenser flow: evaporator flow = L1(X0): L2(X1), N1 min <N1<N1 max , so as to increase the pressure ratio, start the unit and perform normal cooling.

[0061] It can be understood that the technical solution provided in this embodiment can automatically adjust the ratio of the condenser flow path to the evaporator flow path, and then adjust the ratio of the condensing area to the evaporating area, so that the unit can achieve normal startup and cooling under high or low temperature conditions.

[0062] It should be noted that after adding the condenser flow path, the method further includes:

[0063] When the condenser flow path reaches an upper limit value, determining whether the real-time pressure ratio is greater than or equal to a maximum value within a preset range;

[0064] If the real-time pressure ratio is greater than or equal to the maximum value of the preset range, the evaporator flow path is increased until the real-time pressure ratio is within the preset range.

[0065] In practice, under high temperature and high pressure ratio conditions in summer, if the condenser flow path L1(X) continues to increase, and the condenser flow path L1(X2) reaches the maximum number of condenser branches, if the real-time pressure ratio N1 is still greater than the preset maximum value N1 max , then synchronous control adjusts the evaporator flow L2(X) to rise until it reaches a certain value L2(X2), at which point the real-time pressure ratio reaches N1 min <N1<N1 max , so as to reduce the pressure ratio, start the unit and perform normal cooling.

[0066] It can be understood that the technical solution provided in this embodiment can still adjust the real-time pressure ratio when the condenser rises to the maximum number of branches, thereby reducing the pressure ratio, starting the unit, and performing normal cooling.

[0067] It should be noted that after reducing the condenser flow path, the method further includes:

[0068] When the condenser flow path reaches the lower limit value, determining whether the real-time pressure ratio is less than or equal to the minimum value of the preset range;

[0069] If the real-time pressure ratio is less than or equal to the minimum value of the preset range, the evaporator flow path is reduced until the real-time pressure ratio is within the preset range.

[0070] In practice, under low pressure ratio conditions in winter, if the condenser flow path L1(X) is continuously reduced and the condenser flow path L1(X0) reaches the minimum number of condenser branches, if the real-time pressure ratio N1 is still less than the minimum value N1 in the preset range, min , then the synchronous control adjusts the evaporator flow path L2(X) to a certain value L2(X0). At this time, the evaporation area S2(X) synchronously corresponds to S2(X0), and the real-time pressure ratio reaches N1 min <N1<N1 max, so as to increase the pressure ratio, start the unit and perform normal cooling.

[0071] It can be understood that the technical solution provided in this embodiment can still adjust the real-time pressure ratio when the condenser drops to the minimum number of branches, thereby increasing the pressure ratio, starting the unit, and performing normal cooling.

[0072] It should be noted that the controlling the condenser flow path and the evaporator flow path of the refrigeration unit to operate at a first ratio further includes:

[0073] Collect the condensation inlet temperature and condensation outlet temperature;

[0074] Subtract the condensation inlet temperature from the preset maximum and minimum condensation inlet temperatures to obtain a condensation inlet temperature difference;

[0075] Subtract the condensation temperature from the preset maximum and minimum condensation temperatures to obtain a condensation temperature difference;

[0076] According to the condensation inlet temperature difference and the condensation outlet temperature difference, adjusting the condenser flow path in real time;

[0077] According to the adjustment of the condenser flow path, the evaporator flow path is adjusted in real time so that the condenser flow path and the evaporator flow path of the refrigeration unit operate at a first ratio.

[0078] It can be understood that this embodiment can collect the condensation inlet temperature and condensation outlet temperature of the condenser through the temperature sensor, and then obtain the condensation inlet temperature difference and the condensation outlet temperature difference, and then adjust the condenser flow path and the evaporator flow path in real time according to the condensation inlet temperature difference and the condensation outlet temperature difference, so as to realize adaptive adjustment of the condenser flow path, and then realize adaptive adjustment of the condenser heat exchange area, thereby improving system stability.

[0079] It should be noted that the method described above further includes:

[0080] Collect ambient temperature, storage temperature and cooling time;

[0081] The cooling rate is calculated according to the ambient temperature, the preset target storage temperature and the cooling time;

[0082] Subtract the warehouse temperature from the preset maximum and minimum target warehouse temperatures to obtain a warehouse temperature target difference;

[0083] According to the cooling rate and the target difference in storage temperature, a first ratio of the condenser flow path to the evaporator flow path is obtained.

[0084] In actual practice, when planting crops in greenhouses and storing goods in cold storage, there are various usage conditions with seasonal changes. The same greenhouse and cold storage have large load differences under different usage conditions, and the adaptability of the unit is low. If the usage condition of the traditional refrigeration unit is changed, the refrigeration unit needs to be replaced again, which makes the economy low. The technical solution provided in this embodiment can automatically adjust the ratio of the condenser flow path to the evaporator flow path according to the ambient temperature, storage temperature, cooling time and preset target temperature, so that the ratio of the condensation area to the evaporation area is adjusted accordingly, and the stable operation of the unit under multiple load conditions is achieved, which solves the problem of low economy caused by replacing the unit to meet different loads.

[0085] In specific practice, if the unit is used in multiple load segment occasions. When the unit is started, the real-time multi-dimensional detection of the unit operation status, when the storage temperature T = target storage temperature T0, the cooling rate V1 ≥ target rate V0, the flow control module controls the unit flow ratio to operate normally, at this time, condenser flow: evaporator flow = L1 (X3): L2 (X3); when the unit is started, when the real-time multi-dimensional detection of the unit refrigeration capacity cannot meet the cold storage load (for example: ① when the storage temperature T = target storage temperature T0, the cooling rate V1 < target rate V0, at this time the unit refrigeration capacity is insufficient, it is necessary to control and adjust the unit flow to improve the unit heat exchange capacity; ② the storage temperature T continues to fail to reach the set target temperature; ③ the exhaust temperature T is too high; ④ the evaporation is incomplete and the air is sucked with liquid), the flow control module controls the unit flow ratio to intelligently adapt to the condenser flow: evaporator flow = L1 (X4): L2 (X4), so that the unit heat exchanger area increases and the cooling capacity increases.

[0086] Preferably, the flow control module can record multiple startup temperature pull data, the control module memorizes the setting parameters, and intelligently continues the operation in this mode. The unit monitors the lack of cooling capacity in many situations, and automatically feeds back to the flow control module. The flow control module adjusts the heat exchange area of ​​the unit to meet the operation requirements; when the above situation occurs, the data is monitored and memorized each time. After several times, the unit automatically sets the heat exchange area adjustment result to normalization, and is set to operate according to this situation when it is turned on.

[0087] Embodiment 2

[0088] According to a second aspect of an embodiment of the present invention, there is provided a refrigeration unit control device, comprising:

[0089] The data acquisition and processing module 101 is used to obtain the exhaust pressure and suction pressure of the refrigeration unit in real time, and calculate the real-time pressure ratio according to the exhaust pressure and the suction pressure;

[0090] The flow path control module 102 is used to control the condenser flow path of the refrigeration unit according to the real-time pressure ratio and a preset range of the real-time pressure ratio.

[0091] It is understandable that the technical solution provided in this embodiment obtains the exhaust pressure and suction pressure of the refrigeration unit in real time through the data acquisition and processing module 101, and calculates the real-time pressure ratio according to the exhaust pressure and the suction pressure; the condenser flow path of the refrigeration unit is controlled according to the real-time pressure ratio and the preset range of the real-time pressure ratio through the flow path control module 102. It is understandable that the technical solution provided in this embodiment can automatically adjust the condenser flow path and change the condensation area, so that the refrigeration unit can reduce the pressure ratio by increasing the condenser flow path under high temperature and high pressure ratio conditions, and the unit can start and refrigerate normally; under low temperature and low pressure ratio conditions, the pressure ratio can be increased by reducing the condenser flow path, and the unit can start and refrigerate normally.

[0092] It should be noted that the data acquisition and processing module 101 is also used to collect the condensation inlet temperature and the condensation outlet temperature, and to obtain the condensation inlet temperature difference by subtracting the condensation inlet temperature from the preset maximum and minimum values ​​of the condensation inlet temperature; and to obtain the condensation outlet temperature difference by subtracting the condensation outlet temperature from the preset maximum and minimum values ​​of the condensation outlet temperature;

[0093] The flow control module 102 is also used to adjust the condenser flow in real time according to the condensation inlet temperature difference and the condensation outlet temperature difference; and adjust the evaporator flow in real time according to the adjustment of the condenser flow, so that the condenser flow and the evaporator flow of the refrigeration unit operate at a first ratio.

[0094] It can be understood that this embodiment can collect the condensation inlet temperature and condensation outlet temperature of the condenser through the data acquisition and processing module 101, and then obtain the condensation inlet temperature difference and the condensation outlet temperature difference, and then adjust the condenser flow path and the evaporator flow path in real time according to the condensation inlet temperature difference and the condensation outlet temperature difference through the flow control module 102, so as to realize adaptive adjustment of the condenser flow path, and then realize adaptive adjustment of the condenser heat exchange area, thereby improving system stability.

[0095] It should be noted that the data acquisition and processing module 101 is also used to collect ambient temperature, storage temperature and cooling time; calculate the cooling rate based on the ambient temperature, the preset target storage temperature and the cooling time; subtract the storage temperature from the preset target storage temperature maximum and minimum values, respectively, to obtain the storage temperature target difference; and obtain the first ratio of the condenser flow path to the evaporator flow path based on the cooling rate and the storage temperature target difference.

[0096] It can be understood that the technical solution provided in this embodiment can automatically adjust the ratio of the condenser flow path to the evaporator flow path according to the ambient temperature, storage temperature, cooling time and preset target temperature, so that the ratio of the condensation area to the evaporation area is adjusted accordingly, thereby achieving stable operation of the unit under multiple load conditions and solving the problem of low economy caused by replacing units to meet different loads.

[0097] Embodiment 3

[0098] According to a third aspect of an embodiment of the present invention, there is provided a refrigeration unit control system, comprising:

[0099] A refrigeration unit, the above-mentioned refrigeration unit control device, and an exhaust pressure sensor and a suction pressure sensor respectively connected to the control device;

[0100] The condenser and the evaporator of the refrigeration unit are provided with a preset number of flow paths, and the inlet and the outlet of each flow path are respectively provided with a solenoid valve, and the solenoid valves are electrically connected to the control device.

[0101] In practice, see Figure 3 , Figure 4 , Figure 3 is a schematic diagram showing a refrigeration unit principle according to an exemplary embodiment. Figure 3 It is mainly composed of condenser, evaporator, four-way reversing valve, liquid storage tank, steam separator, sensor, solenoid valve, electronic expansion valve, filter, dry filter, stop valve, high-pressure switch, variable frequency fan and other components. It can be seen that the control device is connected to the control ends of each solenoid valve of the condenser and evaporator, and can control and adjust the condenser flow path and the evaporator flow path through the solenoid valve, thereby adjusting the condensation area and the evaporation area.

[0102] It is understandable that the technical solution provided in this embodiment obtains the exhaust pressure and suction pressure of the refrigeration unit in real time, calculates the real-time pressure ratio according to the exhaust pressure and the suction pressure; and controls the condenser flow path of the refrigeration unit according to the preset range of the real-time pressure ratio and the real-time pressure ratio. It is understandable that the technical solution provided in this embodiment can automatically adjust the condenser flow path and change the condensation area, so that the refrigeration unit can reduce the pressure ratio by increasing the condenser flow path under high temperature and high pressure ratio conditions, and the unit can start and refrigerate normally; under low temperature and low pressure ratio conditions, the pressure ratio can be increased by reducing the condenser flow path, and the unit can start and refrigerate normally.

[0103] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0104] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0105] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0106] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0107] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0108] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0109] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0111] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A refrigeration unit control method, characterized in that: include: Acquire the exhaust pressure and suction pressure of the refrigeration unit in real time, and calculate the real-time pressure ratio according to the exhaust pressure and the suction pressure; According to the real-time pressure ratio and the preset range of the real-time pressure ratio, controlling the condenser flow path of the refrigeration unit, including: if the real-time pressure ratio is within the preset range, controlling the condenser flow path and the evaporator flow path of the refrigeration unit to operate at a first ratio; if the real-time pressure ratio is greater than or equal to the maximum value of the preset range, increasing the condenser flow path until the real-time pressure ratio is within the preset range; if the real-time pressure ratio is less than or equal to the minimum value of the preset range, reducing the condenser flow path until the real-time pressure ratio is within the preset range; The controlling the condenser flow path and the evaporator flow path of the refrigeration unit to operate at a first ratio further includes: Collect the condensation inlet temperature and condensation outlet temperature; Subtract the condensation inlet temperature from the preset maximum and minimum condensation inlet temperatures to obtain a condensation inlet temperature difference; Subtract the condensation temperature from the preset maximum and minimum condensation temperatures to obtain a condensation temperature difference; According to the condensation inlet temperature difference and the condensation outlet temperature difference, adjusting the condenser flow path in real time; According to the adjustment of the condenser flow path, the evaporator flow path is adjusted in real time so that the condenser flow path and the evaporator flow path of the refrigeration unit operate at a first ratio.

2. The method according to claim 1, characterized in that Also includes: Collect ambient temperature, storage temperature and cooling time; The cooling rate is calculated according to the ambient temperature, the preset target storage temperature and the cooling time; Subtract the warehouse temperature from the preset maximum and minimum target warehouse temperatures to obtain a warehouse temperature target difference; According to the cooling rate and the target difference in storage temperature, a first ratio of the condenser flow path to the evaporator flow path is obtained.

3. The method according to claim 1, characterized in that After adding the condenser flow path, the method further includes: When the condenser flow path reaches an upper limit value, determining whether the real-time pressure ratio is greater than or equal to a maximum value within a preset range; If the real-time pressure ratio is greater than or equal to the maximum value of the preset range, the evaporator flow path is increased until the real-time pressure ratio is within the preset range.

4. The method according to claim 1, characterized in that After reducing the condenser flow path, the method further comprises: When the condenser flow path reaches the lower limit value, determining whether the real-time pressure ratio is less than or equal to the minimum value of the preset range; If the real-time pressure ratio is less than or equal to the minimum value of the preset range, the evaporator flow path is reduced until the real-time pressure ratio is within the preset range.

5. A refrigeration unit control device, characterized in that: include: A data acquisition and processing module is used to obtain the exhaust pressure and suction pressure of the refrigeration unit in real time, and calculate the real-time pressure ratio according to the exhaust pressure and the suction pressure; A flow path control module, for controlling the condenser flow path of the refrigeration unit according to the real-time pressure ratio and the preset range of the real-time pressure ratio, including: if the real-time pressure ratio is within the preset range, controlling the condenser flow path and the evaporator flow path of the refrigeration unit to operate at a first ratio; if the real-time pressure ratio is greater than or equal to the maximum value of the preset range, increasing the condenser flow path until the real-time pressure ratio is within the preset range; if the real-time pressure ratio is less than or equal to the minimum value of the preset range, reducing the condenser flow path until the real-time pressure ratio is within the preset range; The controlling of the condenser flow path and the evaporator flow path of the refrigeration unit to operate at a first ratio also includes: collecting a condensation inlet temperature and a condensation outlet temperature; subtracting the condensation inlet temperature from a preset maximum and minimum condensation inlet temperature to obtain a condensation inlet temperature difference; subtracting the condensation outlet temperature from a preset maximum and minimum condensation outlet temperature to obtain a condensation outlet temperature difference; adjusting the condenser flow path in real time according to the condensation inlet temperature difference and the condensation outlet temperature difference; adjusting the evaporator flow path in real time according to the adjustment of the condenser flow path, so that the condenser flow path and the evaporator flow path of the refrigeration unit operate at the first ratio.

6. The device according to claim 5, characterized in that The data acquisition and processing module is further used to collect the condensation inlet temperature and the condensation outlet temperature, and to obtain the condensation inlet temperature difference by subtracting the condensation inlet temperature from the preset maximum and minimum values ​​of the condensation inlet temperature; and to obtain the condensation outlet temperature difference by subtracting the condensation outlet temperature from the preset maximum and minimum values ​​of the condensation outlet temperature; The flow control module is also used to adjust the condenser flow in real time according to the condensation inlet temperature difference and the condensation outlet temperature difference; and adjust the evaporator flow in real time according to the adjustment of the condenser flow, so that the condenser flow and the evaporator flow of the refrigeration unit operate at a first ratio.

7. The device according to claim 5, characterized in that The data acquisition and processing module is also used to collect ambient temperature, storage temperature and cooling time; calculate the cooling rate according to the ambient temperature, the preset target storage temperature and the cooling time; subtract the storage temperature from the preset target storage temperature maximum and minimum values ​​respectively to obtain the storage temperature target difference; and obtain the first ratio of the condenser flow path to the evaporator flow path according to the cooling rate and the storage temperature target difference.

8. A refrigeration unit control system, characterized in that: include: A refrigeration unit, a refrigeration unit control device as claimed in claim 5, and an exhaust pressure sensor and a suction pressure sensor respectively connected to the control device; The condenser and the evaporator of the refrigeration unit are provided with a preset number of flow paths, and the inlet and the outlet of each flow path are respectively provided with a solenoid valve, and the solenoid valves are electrically connected to the control device.

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