Refrigeration module, double-circulation refrigeration system and control method and control device of double-circulation refrigeration system

Abstract

According to the refrigeration module, the double-circulation refrigeration system and the control method and device of the double-circulation refrigeration system, flow division of an evaporator can be more uniform, the heat exchange efficiency is higher, and therefore the energy efficiency of the system can be improved. The refrigeration module comprises an input channel, a plurality of evaporation assemblies and an output channel, the input channel is arranged to input refrigerants to the evaporation assemblies, and the output channel is arranged to allow the refrigerants output by the evaporation assemblies to flow in; the evaporation assembly comprises a throttling component and an evaporator, an inlet of the throttling component communicates with the input channel, an outlet of the throttling component communicates with an inlet of the evaporator, and an outlet of the evaporator communicates with the output channel.

Description

Technical Field

[0001] The present application relates to but is not limited to the field of refrigeration equipment technology, and specifically refers to a refrigeration module, a dual-circulation refrigeration system, and a control method and a control device thereof. Background Art

[0002] Since the equipment in the computer room generates a lot of heat and is in operation all year round, it needs to be cooled all year round. In order to save energy and reduce emissions, many air conditioner manufacturers have developed computer room air conditioners that use a compressor and a fluorine pump dual-circulation refrigeration system. In the summer when the outdoor temperature is high, the compressor refrigeration mode is mainly used; in the winter when the outdoor temperature is low, the fluorine pump refrigeration mode is mainly used to achieve the purpose of energy saving and emission reduction.

[0003] Among them, in the compressor refrigeration mode, the refrigerant is in a two-phase state after flowing through the throttling component, and in the fluorine pump refrigeration mode, the refrigerant is in a supercooled state (i.e., supercooled pure liquid) after flowing through the throttling component. Compared with the two-phase refrigerant, the pure liquid refrigerant is more affected by gravity (density and speed are affected by gravity), and the design of the distributor and the diverter pipe cannot take into account both operating modes. For heat exchangers with higher heights, the effect of gravity on diversion is more significant. Usually, the design of the distributor and the diverter pipe is designed according to the compressor refrigeration mode, which will cause significant uneven diversion in the fluorine pump refrigeration mode.

[0004] The current solution is to optimize the diversion between the two operating modes by increasing the pressure loss of the diversion pipe (equivalent to reducing the weight of gravity), but the increase in pressure loss will also increase the power consumption of the compressor and the fluorine pump. Summary of the invention

[0005] The technical problem to be solved by the present application is to provide a refrigeration module, a dual-circulation refrigeration system and a control method and a control device thereof, which can make the evaporator flow distribution more uniform and the heat exchange efficiency higher, thereby helping to improve the energy efficiency of the system.

[0006] To this end, an embodiment of the present application provides a refrigeration module for a dual-cycle refrigeration system, wherein the refrigeration module includes: an input channel, a plurality of evaporation components and an output channel, wherein the input channel is configured to input refrigerant to the plurality of evaporation components, and the output channel is configured to allow the refrigerant output by the plurality of evaporation components to flow in; the evaporation component includes a throttling component and an evaporator, wherein the inlet of the throttling component is connected to the input channel, the outlet of the throttling component is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the output channel.

[0007] The refrigeration module provided in the embodiment of the present application includes multiple evaporation components, each of which includes a throttling component and an evaporator, which is equivalent to splitting an evaporator in the related technology into multiple evaporators, and each of the split evaporators is equipped with a throttling component. In this way, the refrigerant flow rate flowing into each evaporator will be affected by the opening of the corresponding throttling component, so the flow rate entering each evaporator can be adjusted by controlling the opening of multiple throttling components, thereby reducing the weight of gravity through the throttling effect of the throttling component, which is conducive to more uniform flow distribution between multiple evaporators, higher heat exchange efficiency, and also conducive to improving system energy efficiency, and will not increase the power consumption of the compressor and fluorine pump.

[0008] Based on the above technical solution, the present application can also be improved as follows.

[0009] In an exemplary embodiment, the evaporation component also includes a distributor, a collecting pipe and a plurality of shunt pipes connected in parallel, the throttling component, the distributor and the plurality of shunt pipes are connected in sequence, the inlet of the evaporator includes a plurality of sub-inlets, and the outlet of the evaporator includes a plurality of sub-outlets; the plurality of shunt pipes are respectively connected to the plurality of sub-inlets of the evaporator, and the plurality of sub-outlets of the evaporator are connected to the output pipe through the collecting pipe.

[0010] In an exemplary embodiment, the plurality of sub-inlets are arranged along the height direction of the evaporator; and the plurality of sub-outlets are arranged along the height direction of the evaporator.

[0011] In an exemplary embodiment, a plurality of the evaporation components are arranged along a height direction of the evaporator.

[0012] In an exemplary embodiment, the refrigeration module further includes: a temperature detection device configured to detect the temperature of the refrigerant output by the evaporator; and a pressure detection device configured to detect the pressure of the refrigerant output by the evaporator.

[0013] In an exemplary embodiment, the temperature detection device includes a plurality of sub-temperature detection components, and the plurality of sub-temperature detection components are configured to respectively detect the outlet refrigerant temperatures of the plurality of evaporators; and / or, the temperature detection device includes a total temperature detection component, and the total temperature detection component is configured to detect the refrigerant temperature of the output channel.

[0014] In an exemplary embodiment, the pressure detection device includes a plurality of sub-pressure detection components, and the plurality of sub-pressure detection components are configured to respectively detect the outlet refrigerant pressures of the plurality of evaporators; and / or, the pressure detection device includes a total pressure detection component, and the total pressure detection component is configured to detect the refrigerant pressure of the output channel.

[0015] An embodiment of the present application also provides a dual-cycle refrigeration system, comprising a refrigeration module as described in any one of the above embodiments.

[0016] The embodiment of the present application further provides a control method for the dual-cycle refrigeration system as described in the above embodiment, the control method comprising:

[0017] Determining an operating mode of the dual-cycle refrigeration system;

[0018] The throttling components of the plurality of evaporation components are controlled according to the determined working mode so that the refrigerant superheat degrees of the plurality of evaporators tend to be equal.

[0019] In an exemplary embodiment, the working mode includes a compressor cooling mode and / or a mixed cooling mode; and controlling the throttling components of the plurality of evaporation components according to the determined working mode includes:

[0020] Based on the determined working mode being the compressor refrigeration mode or the mixed refrigeration mode, the opening of each throttling component is adjusted according to the outlet refrigerant superheat of each evaporator and the first target superheat, so that the outlet refrigerant superheat of each evaporator approaches the first target superheat.

[0021] In an exemplary embodiment, the working mode includes a compressor cooling mode and / or a mixed cooling mode; and controlling the throttling components of the plurality of evaporation components according to the determined working mode includes:

[0022] Based on the determined working mode being the compressor refrigeration mode or the mixed refrigeration mode, the plurality of throttling components are controlled to maintain the same opening, and the openings of the plurality of throttling components are synchronously adjusted according to the refrigerant superheat of the output channel and the second target superheat, so that the refrigerant superheat of the output channel approaches the second target superheat.

[0023] In an exemplary embodiment, the working mode includes a fluorine pump cooling mode; the plurality of evaporation components are arranged along the height direction of the evaporator, and the evaporator and the throttling component of the evaporation component located at the uppermost side are respectively recorded as the first evaporator and the first throttling component; the throttling components of the plurality of evaporation components are controlled according to the determined working mode, including:

[0024] Based on the determination that the working mode is the fluorine pump refrigeration mode, the first throttling component is controlled to be fully open, and the openings of other throttling components are adjusted according to the outlet refrigerant superheat of the first evaporator and the outlet refrigerant superheat of other evaporators, so that the outlet refrigerant superheat of other evaporators approaches the outlet refrigerant superheat of the first evaporator.

[0025] In an exemplary embodiment, the working mode includes a fluorine pump cooling mode; the plurality of evaporation components are arranged along the height direction of the evaporator, and the evaporator and the throttling component of the evaporation component located at the uppermost side are respectively recorded as the first evaporator and the first throttling component; the throttling components of the plurality of evaporation components are controlled according to the determined working mode, including:

[0026] Based on the determination that the working mode is the fluorine pump refrigeration mode, the first throttling component is controlled to be fully opened, and other throttling components are controlled to be opened to a set opening corresponding to the rated operating condition; wherein, under the rated operating condition, the difference between the outlet refrigerant superheat of the first evaporator and the outlet refrigerant superheat of other evaporators is within a set range.

[0027] In an exemplary embodiment, the setting range is: -1°C to 1°C.

[0028] An embodiment of the present application further provides a control device, including a processor and a memory storing a computer program, wherein the processor implements the steps of the control method described in any one of the above embodiments when executing the computer program. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a refrigeration module provided in some embodiments of the present application;

[0030] Figure 2 A schematic diagram of the structure of a refrigeration module provided in some embodiments of the present application;

[0031] Figure 3 A schematic diagram of the structure of a dual-cycle refrigeration system provided in some embodiments of the present application;

[0032] Figure 4 A flow chart of a control method provided for some embodiments of the present application.

[0033] Figures 1 to 3 The parts represented by the various reference numerals are listed as follows:

[0034] 1 condenser, 2 condensing fan, 3 liquid storage tank, 4 fluorine pump, 5 second one-way valve, 6 throttling component, 7 evaporator, 8 evaporating fan, 9 first one-way valve, 10 compressor, 11 first bypass flow path, 12 second bypass flow path.

[0035] 100 refrigeration module, 110 input channel, 120 output channel, 130 first evaporation component, 131 first throttling component, 132 first distributor, 133 first shunt pipe, 134 first evaporator, 135 first collecting pipe, 140 second evaporation component, 141 second throttling component, 142 second distributor, 143 second shunt pipe, 144 second evaporator, 145 second collecting pipe, 151 first sub-temperature detection component, 152 second sub-temperature detection component, 161 total temperature detection component, 162 total pressure detection component. DETAILED DESCRIPTION

[0036] The principles and features of the present application are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0037] The embodiment of the present application provides a refrigeration module 100 for a dual-cycle refrigeration system.

[0038] like Figure 1 and Figure 2 As shown, the refrigeration module 100 includes: an input channel 110, a plurality of evaporation components, and an output channel 120. The input channel 110 is configured to input refrigerant to the plurality of evaporation components. The output channel 120 is configured to receive the refrigerant output by the plurality of evaporation components.

[0039] The evaporation assembly includes a throttling component 6 and an evaporator 7. The inlet of the throttling component 6 is communicated with the input channel 110, the outlet of the throttling component 6 is communicated with the inlet of the evaporator 7, and the outlet of the evaporator 7 is communicated with the output channel 120.

[0040] like Figure 3 As shown, the dual-circulation refrigeration system may include: a compressor 10, a condenser 1, a liquid storage tank 3, a fluorine pump 4, and a refrigeration module 100 connected by pipelines to form a loop; a condensing fan 2 corresponding to the condenser 1, and an evaporating fan 8 corresponding to the evaporator 7 of the refrigeration module 100; a first bypass flow path 11 connected in parallel with the compressor 10 and a first one-way valve 9 provided on the first bypass flow path 11; a second bypass flow path 12 connected in parallel with the fluorine pump 4 and a second one-way valve 5 provided on the second bypass flow path 12.

[0041] The first one-way valve 9 is configured to be one-way in the direction from the outlet of the refrigeration module 100 to the inlet of the condenser 1. The second one-way valve 5 is configured to be one-way in the direction from the outlet of the condenser 1 to the inlet of the refrigeration module 100. A liquid storage tank 3 may also be provided between the outlet of the condenser 1 and the fluorine pump 4. The evaporator 7 and the evaporation fan 8 are located on the indoor side, and the condenser 1 and the condensation fan 2 are located on the outdoor side. The throttling component 6 may be, but is not limited to, an electronic expansion valve.

[0042] The dual-cycle refrigeration system can be set to have the following three refrigeration modes: compressor refrigeration mode, mixed refrigeration mode, and fluorine pump refrigeration mode. The working principles of each refrigeration mode are as follows:

[0043] Compressor refrigeration mode: the first check valve 9 is closed and the second check valve 5 is open. The refrigerant flows through the compressor 10, the condenser 1, the liquid storage tank 3, the second bypass flow path 12, and the refrigeration module 100 in sequence to form a first circulation loop. In this refrigeration mode, the fluorine pump 4 is stopped and the compressor 10 is started to provide power for the refrigeration operation of the system.

[0044] Mixed refrigeration mode: the first one-way valve 9 is closed, and the second one-way valve 5 is closed. The refrigerant flows through the compressor 10, the condenser 1, the liquid storage tank 3, the fluorine pump 4, and the refrigeration module 100 in sequence to form a second circulation loop. In this refrigeration mode, the fluorine pump 4 and the compressor 10 are both started, and the outdoor natural cold source is partially utilized. The fluorine pump 4 can compensate for the circulation power of the refrigerant in the system, reduce the pressure loss of the refrigerant during the circulation process, make the compressor 10 work under the best working condition, reduce the energy consumption of the compressor 10, improve the refrigeration efficiency, and have a certain energy-saving effect.

[0045] Fluorine pump refrigeration mode: the first one-way valve 9 is turned on, and the second one-way valve 5 is turned off. Figure 1 As shown, the refrigerant flows through the first bypass flow path 11, the condenser 1, the liquid storage tank 3, the fluorine pump 4, and the refrigeration module 100 in sequence to form a third circulation loop. In this refrigeration mode, the fluorine pump 4 is started and the compressor 10 is stopped, making full use of the outdoor natural cold source, and using the fluorine pump 4 instead of the compressor 10 to provide power for the system cycle. Since the power of the fluorine pump 4 is much smaller than that of the compressor 10, it can significantly reduce the power consumption of the computer room air conditioner, which has a significant energy-saving effect.

[0046] In the related art, there is only one evaporator and one throttling component. After the refrigerant flows through the throttling component, it enters the evaporator for distribution. Gravity will have a great impact on the distribution of the refrigerant flow in the evaporator. The refrigeration module 100 provided in the embodiment of the present application includes multiple evaporation components, each of which includes a throttling component 6 and an evaporator 7. This is equivalent to splitting an evaporator in the related art into multiple components, and each of the split evaporators 7 is equipped with a throttling component 6. In this way, the refrigerant flow flowing into each evaporator 7 will be affected by the opening of the corresponding throttling component 6, so the flow entering each evaporator 7 can be adjusted by controlling the opening of multiple throttling components 6, so that the weight of the gravity effect can be reduced by the throttling effect of the throttling component 6, which is conducive to more uniform flow distribution between multiple evaporators 7, higher heat exchange efficiency, and also conducive to improving system energy efficiency, and will not increase the power consumption of the compressor 10 and the fluorine pump 4.

[0047] For example, for an evaporator 7 where gravity creates a greater resistance to the flow of the refrigerant (such as an evaporator 7 located relatively high), the opening of the corresponding throttling component 6 can be appropriately larger. For an evaporator 7 where gravity creates a smaller resistance or no resistance to the flow of the refrigerant (such as an evaporator 7 located relatively low), the opening of the corresponding throttling component 6 can be appropriately smaller. In this way, the refrigerant flow rates of the evaporators 7 at different positions can be close, making the flow distribution between multiple evaporation components more uniform, the heat exchange efficiency higher, and the system energy efficiency higher.

[0048] In some exemplary embodiments, Figure 1 and Figure 2 As shown, the evaporation assembly also includes a distributor, a header and a plurality of shunt pipes connected in parallel. The throttling component 6, the distributor and the plurality of shunt pipes are connected in sequence. The inlet of the evaporator 7 includes a plurality of sub-inlets, and the outlet of the evaporator 7 includes a plurality of sub-outlets. The plurality of shunt pipes are respectively connected to the plurality of sub-inlets of the evaporator 7. The plurality of sub-outlets of the evaporator 7 are connected to the output pipeline through the header. The shunt pipe can be a capillary tube.

[0049] In this way, each evaporator 7 can input refrigerant through multiple shunt pipes, which is conducive to the rapid flow of refrigerant to different positions in the evaporator 7, making the flow distribution inside the evaporator 7 more uniform. Each evaporator 7 can output refrigerant through multiple sub-outlets to the manifold and then flow to the output channel 120 after merging, which is conducive to increasing the output flow of the evaporator 7.

[0050] Furthermore, when the evaporator 7 is split into multiple parts, it is convenient to determine the design and selection of the throttling component 6, distributor, shunt pipe and evaporator 7 of each evaporation component according to factors such as the wind volume and wind field at the location of each evaporation component.

[0051] For example, where the wind speed is high, the shunt pipe can be relatively thicker, so that the flow rate in the evaporator 7 is relatively larger, so as to increase the heat exchange capacity of the evaporator 7. Where the wind speed is low, the shunt pipe can be relatively thinner, so that the flow rate in the evaporator 7 is relatively smaller, so as to avoid the refrigerant not being able to fully exchange heat, resulting in low heat exchange efficiency of the evaporator 7.

[0052] Of course, the evaporator 7 may also have only one independent inlet and one independent outlet, and then the distributor, the shunt pipe and the collecting pipe may be omitted.

[0053] In some exemplary embodiments, Figure 1 and Figure 2 As shown, a plurality of sub-inlets are arranged along the height direction of the evaporator 7, that is, arranged at intervals in the up-down direction. A plurality of sub-outlets are arranged along the height direction of the evaporator 7, that is, arranged at intervals in the up-down direction.

[0054] This is beneficial to reducing the cross-sectional area of ​​the evaporator 7 and optimizing the structural layout of the dual-circulation refrigeration system.

[0055] Of course, multiple sub-inlets may also be arranged at intervals in the horizontal direction. Multiple sub-outlets may also be arranged at intervals in the horizontal direction.

[0056] In some exemplary embodiments, Figure 1 and Figure 2 As shown, a plurality of evaporation components are arranged along the height direction of the evaporator 7. After assembly, the height direction of the evaporator 7 is the vertical direction.

[0057] In the related art, after the refrigerant flows through the throttling component 6, it is affected by gravity, which will cause the refrigerant flow rate in the upper part of the evaporator 7 to be relatively small, the refrigerant superheat degree to be relatively large, and the heat exchange efficiency to be low; while the refrigerant flow rate in the lower part of the evaporator 7 is relatively large, the refrigerant superheat degree to be relatively small, and the heat exchange efficiency to be high. Therefore, the influence of gravity on the refrigerant flow distribution is mainly reflected in the vertical direction.

[0058] Therefore, in the embodiment of the present application, multiple evaporation components are arranged along the height direction of the evaporator 7, that is, arranged along the vertical direction, so as to facilitate the control of the opening of each throttling component 6 to minimize the adverse effect of gravity on the refrigerant diversion, so that the refrigerant can be distributed more evenly among the multiple evaporators 7.

[0059] In some exemplary embodiments, the refrigeration module 100 further includes: a temperature detection device and a pressure detection device.

[0060] The temperature detection device is configured to detect the temperature of the refrigerant output by the evaporator 7 . The pressure detection device is configured to detect the pressure of the refrigerant output by the evaporator 7 .

[0061] This makes it easy to reasonably control the throttling component 6 based on the detection results of the temperature detection device and the detection results of the pressure detection device.

[0062] Among them, the refrigerant pressure output by the evaporator 7 can be determined according to the detection result of the pressure detection device, and the saturation temperature of the refrigerant under the current pressure can be determined according to the refrigerant pressure. The refrigerant temperature output by the evaporator 7 can be determined according to the detection result of the temperature detection device. The current refrigerant superheat can be obtained by subtracting the saturation temperature of the refrigerant under the current pressure from the current refrigerant temperature, so as to facilitate the opening control of the throttling component 6 to keep the refrigerant superheat of the evaporator 7 within a suitable range. Keeping the refrigerant superheat of the evaporator 7 within a suitable range is conducive to the evaporator 7 having a higher heat exchange efficiency, and is conducive to the compressor 10 working in a better working condition, which is conducive to improving the energy efficiency of the system.

[0063] In some exemplary embodiments, Figure 1 As shown, the temperature detection device includes a plurality of sub-temperature detection components, and the plurality of sub-temperature detection components are configured to respectively detect the outlet refrigerant temperatures of a plurality of evaporators 7 .

[0064] The refrigerant output temperatures of different evaporators 7 may vary greatly, so a plurality of sub-temperature detection components are provided to detect the outlet refrigerant temperature of each evaporator 7, and then individually control the refrigerant superheat of each evaporator 7, so that the refrigerant superheat of each evaporator 7 can be close to the appropriate refrigerant superheat (which can be recorded as the first target superheat).

[0065] like Figure 1 As shown, a plurality of sub-temperature detection components may be arranged one by one at the outlets of a plurality of manifolds to detect the temperature of the refrigerant output by each evaporator 7. The sub-temperature detection component may be a temperature sensor.

[0066] In other exemplary embodiments, Figure 2 As shown, the temperature detection device includes a total temperature detection component 161, and the total temperature detection component 161 is configured to detect the refrigerant temperature of the output channel 120. The total temperature detection component 161 can be a temperature sensor.

[0067] Theoretically, the refrigerant superheat at the output channel 120 should be the average of the refrigerant superheats of the multiple evaporators 7. Therefore, when the refrigerant superheats of the multiple evaporators 7 tend to be equal, they are also basically equivalent to the refrigerant superheat at the output channel 120. Therefore, the opening of each throttling component 6 can also be dynamically adjusted by the refrigerant superheat at the output channel 120, so that the refrigerant superheat at the output channel 120 approaches the appropriate refrigerant superheat (which can be recorded as the second target superheat). The second target superheat can be equal to the first target superheat, for example, both are equal to 3°C.

[0068] Furthermore, this solution can reduce the number of temperature detection components, which is helpful to simplify the structure of the refrigeration module 100 and reduce production costs.

[0069] Of course, the temperature detection device may also include a plurality of sub-temperature detection components and a total temperature detection component 161 to further improve the control accuracy.

[0070] In some exemplary embodiments, the pressure detection device includes a plurality of sub-pressure detection components, and the plurality of sub-pressure detection components are configured to respectively detect the outlet refrigerant pressures of a plurality of evaporators 7 .

[0071] In other exemplary embodiments, the pressure detection device includes a total pressure detection component 162, such as Figure 1 and Figure 2 As shown, the total pressure detection component 162 is configured to detect the refrigerant pressure of the output channel 120 .

[0072] Since the outlets of the multiple evaporators 7 are all connected to the output channel 120, the refrigerant pressure at the outlets of the multiple evaporators 7 is very close to the refrigerant pressure at the output channel 120. Therefore, multiple sub-pressure detection components can be provided to detect the outlet refrigerant pressures of the multiple evaporators 7 respectively to improve the detection accuracy; a total pressure detection component 162 can also be provided to detect the refrigerant pressure of the output channel 120, and the refrigerant pressure of the output channel 120 is equal to the outlet refrigerant pressure of each evaporator 7 to reduce the number of pressure detection components.

[0073] Of course, the pressure detection device may also include a plurality of sub-pressure detection components and a total pressure detection component 162 to further improve the control accuracy. Both the sub-pressure detection components and the total pressure detection component 162 may be pressure sensors.

[0074] In some exemplary embodiments, Figure 1 and Figure 2 As shown, there are two evaporation assemblies. The evaporation assembly located on the upper side is a first evaporation assembly 130, which includes a first throttling component 131, a first distributor 132, a plurality of first shunt pipes 133 connected in parallel, a first evaporator 134, and a first header 135. The evaporation assembly located on the lower side is a second evaporation assembly 140, which includes a second throttling component 141, a second distributor 142, a plurality of second shunt pipes 143 connected in parallel, a second evaporator 144, and a second header 145.

[0075] The dual-circulation refrigeration system provided in the embodiment of the present application includes the refrigeration module 100 as in any one of the above embodiments, and thus has all the above-mentioned beneficial effects, which will not be described in detail here.

[0076] The present application also provides a control method for the dual-cycle refrigeration system of the above embodiment. Figure 4 As shown, the control method includes:

[0077] Step S202: determining the working mode of the dual-cycle refrigeration system;

[0078] Step S204: controlling the throttling components of the plurality of evaporating components according to the determined working mode so that the refrigerant superheat degrees of the plurality of evaporators tend to be equal.

[0079] The control method provided in the embodiment of the present application can, after determining the working mode of the dual-circulation refrigeration system, control multiple throttling components 6 to make the refrigerant superheat of multiple evaporators 7 tend to be equal, thereby ensuring that the refrigerant distribution between the multiple evaporators 7 is relatively uniform, so that the multiple evaporators 7 have relatively high heat exchange efficiency, thereby improving the energy efficiency of the system.

[0080] The working mode of the dual-circulation refrigeration system can be determined according to the states of the first one-way valve 9 and the second one-way valve 5. When the first one-way valve 9 is closed and the second one-way valve 5 is turned on, the working mode is the compressor refrigeration mode. When the first one-way valve 9 is closed and the second one-way valve 5 is closed, the working mode is the mixed refrigeration mode. When the first one-way valve 9 is turned on and the second one-way valve 5 is closed, the working mode is the fluorine pump refrigeration mode.

[0081] The working mode of the dual-cycle refrigeration system can also be determined according to the working states of the compressor 10 and the fluorine pump 4. When the compressor 10 is turned on and the fluorine pump 4 is turned off, the working mode is the compressor refrigeration mode. When the compressor 10 is turned on and the fluorine pump 4 is also turned on, the working mode is the mixed refrigeration mode. When the compressor 10 is turned off and the fluorine pump 4 is turned on, the working mode is the fluorine pump refrigeration mode.

[0082] In some exemplary embodiments, the operating modes include a compressor cooling mode and / or a hybrid cooling mode.

[0083] Controlling the throttling components 6 of the plurality of evaporation components according to the determined working mode comprises:

[0084] Based on the determined working mode being the compressor refrigeration mode or the mixed refrigeration mode, the opening of each throttling component 6 is adjusted according to the outlet refrigerant superheat of each evaporator 7 and the first target superheat, so that the outlet refrigerant superheat of each evaporator 7 approaches the first target superheat.

[0085] When the dual-cycle refrigeration system operates in the compressor refrigeration mode or the mixed refrigeration mode, the first target superheat is taken as the target, and the opening of each throttling component 6 is dynamically adjusted according to the outlet refrigerant superheat of each evaporator 7, so that the outlet refrigerant superheat of each evaporator 7 can approach the first target superheat. The outlet refrigerant superheat of each evaporator 7 can be determined according to the detection results of each sub-temperature detection component and the detection results of the total pressure detection component 162 (or the detection results of each sub-pressure detection component).

[0086] The first target superheat is the ideal target superheat of the evaporator 7. When the outlet refrigerant superheat of each evaporator 7 approaches the first target superheat, the heat exchange efficiency of each evaporator 7 is high, the energy efficiency of the compressor 10 is also high, and thus the system energy efficiency is also high. In addition, the outlet refrigerant superheat of multiple evaporators 7 is more stable, and the operating reliability of the compressor 10 is also higher.

[0087] In other exemplary embodiments, the operating mode includes a compressor cooling mode and / or a hybrid cooling mode.

[0088] Controlling the throttling components 6 of the plurality of evaporation components according to the determined working mode comprises:

[0089] Based on the determined working mode being the compressor cooling mode or the mixed cooling mode, the plurality of throttling components 6 are controlled to maintain the same opening, and the openings of the plurality of throttling components 6 are synchronously adjusted according to the refrigerant superheat of the output channel 120 and the second target superheat, so that the refrigerant superheat of the output channel 120 approaches the second target superheat. The second target superheat may be equal to the first target superheat.

[0090] When the dual-cycle refrigeration system operates in the compressor refrigeration mode or the mixed refrigeration mode, the second target superheat is taken as the target, and the openings of the plurality of throttling components 6 are synchronously and dynamically adjusted according to the refrigerant superheat of the output channel 120, so that the refrigerant superheat of the output channel 120 approaches the second target superheat. The refrigerant superheat of the output channel 120 can be determined according to the detection results of the total temperature detection component 161 and the detection results of the total pressure detection component 162.

[0091] The second target superheat is the ideal target superheat of the output channel 120, and theoretically, it is also the ideal target superheat of the evaporator 7. When the refrigerant superheat of the output channel 120 approaches the second target superheat, the refrigerant superheat of each evaporator 7 also approaches the second target superheat, so the heat exchange efficiency is also high, the energy efficiency of the compressor 10 is also high, and thus the system energy efficiency is also high. In addition, the outlet refrigerant superheat of multiple evaporators 7 is more stable, and the operating reliability of the compressor 10 is also higher.

[0092] In some exemplary embodiments, the working mode includes a fluorine pump cooling mode. A plurality of evaporation assemblies are arranged along the height direction of the evaporator 7, and the evaporator 7 and the throttling component 6 of the evaporation assembly located at the uppermost side are respectively recorded as the first evaporator 134 and the first throttling component 131. The evaporators 7 and the throttling components 6 of other evaporation assemblies are collectively referred to as other evaporators 7 and other throttling components 6.

[0093] Controlling the throttling components 6 of the plurality of evaporation components according to the determined working mode comprises:

[0094] Based on the determination that the working mode is the fluorine pump refrigeration mode, the first throttling component 131 is controlled to be fully open, and the opening of other throttling components 6 is adjusted according to the outlet refrigerant superheat of the first evaporator 134 and the outlet refrigerant superheat of other evaporators 7, so that the outlet refrigerant superheat of other evaporators 7 approaches the outlet refrigerant superheat of the first evaporator 134.

[0095] Affected by gravity, the resistance of the refrigerant entering the uppermost evaporator 7 is the greatest. Therefore, when the dual-circulation refrigeration system operates in the fluorine pump refrigeration mode, the first throttling component 131 is fully opened to increase the refrigerant flow entering the first evaporator 134 (i.e., the uppermost evaporator 7); other throttling components 6 are partially opened to reduce the refrigerant flow entering other evaporators 7, thereby enabling the refrigerant distribution among multiple evaporators 7 to be relatively uniform.

[0096] Since the first throttling component 131 is fully open, the outlet refrigerant superheat of the first evaporator 134 is relatively ideal. Therefore, taking the outlet refrigerant superheat of the first evaporator 134 as the target, the opening of other throttling components 6 is dynamically adjusted so that the outlet refrigerant superheat of other evaporators 7 can approach the outlet refrigerant superheat of the first evaporator 134. Then, the refrigerant superheat of multiple evaporators 7 is relatively ideal, which is conducive to multiple heat exchangers having higher heat exchange efficiency.

[0097] In other exemplary embodiments, the working mode includes a fluorine pump cooling mode. A plurality of evaporation assemblies are arranged along the height direction of the evaporator 7, and the evaporator 7 and the throttling component 6 of the evaporation assembly located at the uppermost side are respectively recorded as the first evaporator 134 and the first throttling component 131. The evaporators and throttling components 6 of other evaporation assemblies are collectively referred to as other evaporators 7 and other throttling components 6.

[0098] Controlling the throttling components 6 of the plurality of evaporation components according to the determined working mode comprises:

[0099] Based on the determined working mode being the fluorine pump refrigeration mode, the first throttling component 131 is controlled to be fully opened, and the other throttling components 6 are controlled to be opened to a set opening corresponding to the rated working condition;

[0100] Among them, under the rated operating conditions, the difference between the outlet refrigerant superheat of the first evaporator 134 and the outlet refrigerant superheat of other evaporators 7 is within the set range.

[0101] In some embodiments, the setting range is: -1° C. to 1° C. Of course, the setting range is not limited to this range.

[0102] Affected by gravity, the resistance of the refrigerant entering the uppermost evaporator 7 is the greatest. Therefore, when the dual-circulation refrigeration system operates in the fluorine pump refrigeration mode, the first throttling component 131 is fully opened to increase the refrigerant flow entering the first evaporator 134 (i.e., the uppermost evaporator 7); other throttling components are partially opened to reduce the refrigerant flow entering other evaporators 7, thereby enabling the refrigerant distribution among multiple evaporators 7 to be relatively uniform.

[0103] When the outlet refrigerant superheat of each evaporator 7 cannot be determined, the opening of other throttling components 6 can be adjusted to the set opening corresponding to the rated operating condition, and no further adjustment is required during operation.

[0104] Under rated working conditions, the first throttle component 131 is fully opened, and other throttle components 6 are opened to a set opening, and the difference between the outlet refrigerant superheat of the first evaporator 134 and the outlet refrigerant superheat of other evaporators 7 is within a set range and is relatively close. Therefore, the heat exchange efficiency of multiple evaporators 7 is relatively high. The set opening corresponding to the rated working condition can be obtained based on theoretical calculation and actual measurement verification in the design stage.

[0105] Rated operating conditions refer to the conditions under which the binary refrigeration system outputs rated cooling capacity under standard operating conditions. Standard operating conditions refer to the binary refrigeration system under standard environmental conditions, such as: the indoor temperature is the set indoor temperature, the outdoor temperature is the set outdoor temperature, the relative humidity is the set humidity, the air flow is the set flow, the power supply voltage is the set voltage, etc. Standard operating conditions and rated cooling capacity may vary depending on factors such as specific countries, applications and manufacturers.

[0106] Two embodiments are described below.

[0107] Embodiment 1

[0108] The refrigeration module 100 includes an input channel 110, two evaporation components and an output channel 120. The two evaporation components are respectively a first evaporation component 130 and a second evaporation component 140. The evaporation component located on the upper side is the first evaporation component 130, and the first evaporation component 130 includes a first throttling component 131, a first distributor 132, a plurality of first shunt pipes 133 connected in parallel, a first evaporator 134 and a first header 135. The evaporation component located on the lower side is the second evaporation component 140, and the second evaporation component 140 includes a second throttling component 141, a second distributor 142, a plurality of second shunt pipes 143 connected in parallel, a second evaporator 144 and a second header 145.

[0109] The refrigeration module 100 also includes a temperature detection device and a pressure detection device. The temperature detection device includes a first sub-temperature detection component 151 and a second sub-temperature detection component 152. The first sub-temperature detection component 151 is arranged at the outlet of the first manifold 135, and is configured to detect the refrigerant temperature at the outlet of the first manifold 135. The second sub-temperature detection component 152 is arranged at the outlet of the second manifold 145, and is configured to detect the refrigerant temperature at the outlet of the second manifold 145. The pressure detection device includes a total pressure detection component 162, which is arranged at the output channel 120 and is configured to detect the refrigerant pressure in the output channel 120.

[0110] Here’s how it works:

[0111] In compressor cooling mode or hybrid cooling mode: the opening of the first throttling component 131 is dynamically controlled according to the current refrigerant superheat A at the outlet of the first header 135, with the pre-set first target superheat SH as the control target. The opening of the second throttling component 141 is dynamically controlled according to the current refrigerant superheat B at the outlet of the second header 145, with the pre-set first target superheat value SH as the control target. By controlling the refrigerant superheat of the first evaporator 134 and the second evaporator 144 respectively, the heat exchange efficiency of the two evaporators 7 can be optimized by adjusting the flow distribution.

[0112] In the fluorine pump refrigeration mode: the first throttling component 131 is fully open, and the second throttling component 141 dynamically adjusts its opening according to the current refrigerant superheat A value at the outlet of the first manifold 135, so that the refrigerant superheat B value at the outlet of the second manifold 145 is as close to the refrigerant superheat A value as possible.

[0113] Refrigerant superheat degree A: calculated from the detection values ​​of the first sub-temperature detection component 151 and the total pressure detection component 162;

[0114] Refrigerant superheat degree B: calculated based on the detection values ​​of the second sub-temperature detection component 152 and the total pressure detection component 162.

[0115] Embodiment 2

[0116] The difference from the first embodiment is that the temperature detection device includes a total temperature detection component 161 , which is disposed at the output channel 120 and configured to detect the refrigerant temperature in the output channel 120 .

[0117] Here’s how it works:

[0118] In the compressor cooling mode or the mixed cooling mode: the first throttling component 131 and the second throttling component 141 always maintain the same opening, and the openings of the two are dynamically controlled according to the refrigerant superheat C with a pre-set second target superheat value SH as the control target.

[0119] In the fluorine pump refrigeration mode: the first throttling component 131 is fully opened, and the second throttling component 141 is opened to the specified opening P. Method for determining the P value: In the design stage, based on theoretical calculation and actual measurement verification, a suitable P value is designed so that the refrigerant superheat at the outlet of the first header 135 is close to the refrigerant superheat at the outlet of the second header 145 at the rated working point (i.e. rated working condition) of the fluorine pump (e.g. the difference is within the range of ±1°C).

[0120] Refrigerant superheat degree C: calculated from the detection values ​​of the total temperature detection component 161 and the total pressure detection component 162.

[0121] An embodiment of the present application also provides a control device, including a processor and a memory storing a computer program. When the processor executes the computer program, the steps of the control method in any of the above embodiments are implemented, thereby having all the above-mentioned beneficial effects.

[0122] The processor may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0123] The embodiment of the present application also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the steps of the control method in any of the above embodiments are implemented, thereby having all the above-mentioned beneficial effects.

[0124] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0125] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0126] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0127] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0128] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 application. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0129] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0130] In any one or more of the above exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on a computer-readable medium or transmitted via a computer-readable medium as one or more instructions or codes, and executed by a hardware-based processing unit. A computer-readable medium may include a computer-readable storage medium corresponding to a tangible medium such as a data storage medium, or a communication medium that facilitates a computer program, such as any medium transmitted from one place to another according to a communication protocol. In this way, a computer-readable medium may generally correspond to a non-temporary tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the technology described in the present disclosure. A computer program product may include a computer-readable medium.

[0131] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Moreover, any connection may also be referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio and microwave are included in the definition of medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transient (transient) media, but are directed to non-transient tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVDs), floppy disks, or Blu-ray disks, etc., where disks typically reproduce data magnetically, while optical disks use lasers to reproduce data optically. Combinations of the above should also be included within the scope of computer-readable media.

[0132] For example, instructions may be executed by one or more processors such as one or more digital signal processors (DSPs), general purpose microprocessors, application specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Thus, the term "processor" as used herein may refer to any of the above structures or any other structures suitable for implementing the techniques described herein. Additionally, in some aspects, the functionality described herein may be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Also, the techniques may be fully implemented in one or more circuits or logic elements.

[0133] The technical solutions of the embodiments of the present disclosure can be implemented in a wide variety of devices or equipment, including wireless mobile phones, integrated circuits (ICs) or a group of ICs (e.g., chipsets). Various components, modules or units are described in the embodiments of the present disclosure to emphasize the functional aspects of the devices configured to perform the described techniques, but they do not necessarily need to be implemented by different hardware units. Instead, as described above, the various units can be combined in a codec hardware unit or provided by a collection of interoperable hardware units (including one or more processors as described above) in combination with suitable software and / or firmware.

Claims

1. A refrigeration module for a dual-cycle refrigeration system, characterized in that: The refrigeration module comprises: an input channel, a plurality of evaporation components and an output channel, wherein the input channel is configured to input refrigerant into the plurality of evaporation components, and the output channel is configured to allow the refrigerant output by the plurality of evaporation components to flow in; The evaporation assembly includes a throttling component and an evaporator. The inlet of the throttling component is communicated with the input channel, the outlet of the throttling component is communicated with the inlet of the evaporator, and the outlet of the evaporator is communicated with the output channel.

2. The refrigeration module according to claim 1, characterized in that: The evaporation assembly further comprises a distributor, a manifold and a plurality of shunt pipes connected in parallel, the throttling component, the distributor and the plurality of shunt pipes are sequentially connected, the inlet of the evaporator comprises a plurality of sub-inlets, and the outlet of the evaporator comprises a plurality of sub-outlets; The plurality of branch pipes are respectively communicated with the plurality of sub-inlets of the evaporator, and the plurality of sub-outlets of the evaporator are communicated with the output pipeline through the collecting pipe.

3. The refrigeration module according to claim 2, characterized in that: The plurality of sub-inlets are arranged along the height direction of the evaporator; The plurality of sub-outlets are arranged along the height direction of the evaporator.

4. The refrigeration module according to any one of claims 1 to 3, characterized in that: The plurality of evaporation components are arranged along the height direction of the evaporator.

5. The refrigeration module according to any one of claims 1 to 3, characterized in that: Also includes: a temperature detection device, configured to detect the temperature of the refrigerant output by the evaporator; and The pressure detection device is configured to detect the refrigerant pressure output by the evaporator.

6. The refrigeration module according to claim 5, characterized in that: The temperature detection device comprises a plurality of sub-temperature detection components, wherein the plurality of sub-temperature detection components are configured to respectively detect outlet refrigerant temperatures of the plurality of evaporators; and / or The temperature detection device includes a total temperature detection component, and the total temperature detection component is configured to detect the refrigerant temperature of the output channel.

7. The refrigeration module according to claim 5, characterized in that: The pressure detection device comprises a plurality of sub-pressure detection components, wherein the plurality of sub-pressure detection components are configured to respectively detect the outlet refrigerant pressures of the plurality of evaporators; and / or The pressure detection device includes a total pressure detection component, and the total pressure detection component is configured to detect the refrigerant pressure of the output channel.

8. A dual-cycle refrigeration system, characterized in that: The invention comprises a refrigeration module according to any one of claims 1 to 7.

9. A control method, characterized in that: For the dual-cycle refrigeration system as claimed in claim 8, the control method comprises: Determining an operating mode of the dual-cycle refrigeration system; The throttling components of the plurality of evaporation components are controlled according to the determined working mode so that the refrigerant superheat degrees of the plurality of evaporators tend to be equal.

10. The control method according to claim 9, characterized in that: The working mode includes a compressor refrigeration mode and / or a mixed refrigeration mode; The controlling the throttling components of the plurality of evaporation components according to the determined working mode comprises: Based on the determined working mode being the compressor refrigeration mode or the mixed refrigeration mode, the opening of each throttling component is adjusted according to the outlet refrigerant superheat of each evaporator and the first target superheat, so that the outlet refrigerant superheat of each evaporator approaches the first target superheat.

11. The control method according to claim 9, characterized in that: The working mode includes a compressor refrigeration mode and / or a mixed refrigeration mode; The controlling the throttling components of the plurality of evaporation components according to the determined working mode comprises: Based on the determined working mode being the compressor refrigeration mode or the mixed refrigeration mode, the plurality of throttling components are controlled to maintain the same opening, and the openings of the plurality of throttling components are synchronously adjusted according to the refrigerant superheat of the output channel and the second target superheat, so that the refrigerant superheat of the output channel approaches the second target superheat.

12. The control method according to claim 9, characterized in that: The working mode includes a fluorine pump cooling mode; the plurality of evaporation components are arranged along the height direction of the evaporator, and the evaporator and the throttling component of the evaporation component located at the uppermost side are respectively recorded as the first evaporator and the first throttling component; The controlling the throttling components of the plurality of evaporation components according to the determined working mode comprises: Based on the determination that the working mode is the fluorine pump refrigeration mode, the first throttling component is controlled to be fully open, and the openings of other throttling components are adjusted according to the outlet refrigerant superheat of the first evaporator and the outlet refrigerant superheat of other evaporators, so that the outlet refrigerant superheat of other evaporators approaches the outlet refrigerant superheat of the first evaporator.

13. The control method according to claim 9, characterized in that: The working mode includes a fluorine pump cooling mode; the plurality of evaporation components are arranged along the height direction of the evaporator, and the evaporator and the throttling component of the evaporation component located at the uppermost side are respectively recorded as the first evaporator and the first throttling component; The controlling the throttling components of the plurality of evaporation components according to the determined working mode comprises: Based on the determined working mode being the fluorine pump refrigeration mode, controlling the first throttling component to be fully opened, and controlling other throttling components to be opened to a set opening corresponding to the rated working condition; Wherein, under the rated operating condition, the difference between the outlet refrigerant superheat of the first evaporator and the outlet refrigerant superheat of other evaporators is within a set range.

14. The control method according to claim 13, characterized in that: The setting range is: -1°C to 1°C.

15. A control device, characterized in that: The system comprises a processor and a memory storing a computer program, wherein when the processor executes the computer program, the steps of the control method according to any one of claims 9 to 14 are implemented.

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