Refrigerating unit, control method and device of refrigerating unit, equipment and storage medium

Abstract

The invention relates to a refrigerating unit, a control method and device of the refrigerating unit, equipment and a storage medium. The refrigerating unit comprises a refrigerating unit body; the system comprises an annular refrigerant pipeline, a bypass refrigerant pipeline, a compressor, a condenser, an evaporator set and a controller. The annular refrigerant pipeline is sequentially connected with the compressor, the condenser and the evaporator set and returns to the compressor. The evaporator set comprises a first evaporator and a second evaporator which are connected. An inlet of the bypass refrigerant pipeline is connected with the annular refrigerant pipeline between the compressor and the condenser, and an outlet is connected with the first evaporator and the second evaporator; and the controller is used for controlling the on-off state of each connecting point of the annular refrigerant pipeline and the bypass refrigerant pipeline. In the defrosting mode, the compressor does not need to be shut down, one evaporator defrosts, the other evaporator refrigerates, the problem that after the compressor is shut down, refrigerants stay in the evaporators to evaporate and absorb heat is avoided, and therefore the defrosting efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, and in particular to a refrigeration unit, a control method, device and equipment of the refrigeration unit and a storage medium. BACKGROUND

[0002] The double-system refrigerator is generally provided with two sets of evaporators (i.e., a refrigeration evaporator and a freezing evaporator), and the double-system refrigerator adopts a single-suction compressor, and the refrigeration unit is a conventional single-suction series-parallel system or a pure parallel system.

[0003] During the defrosting process of the double-system refrigerator, the compressor needs to be stopped, and the frost layer on the surface of the evaporator is melted by heating wires, but after the compressor is stopped during the defrosting process, about 20% of the liquid refrigerant remains in the evaporator, and this part of the refrigerant absorbs the heat radiated to the surface of the evaporator by the heating wires during the defrosting stage, which directly causes the low efficiency of the traditional defrosting process, and even causes the temperature fluctuation in the interchamber, affecting the storage effect of the goods. SUMMARY

[0004] The present application provides a refrigeration unit, a control method, device and equipment of the refrigeration unit and a storage medium to solve the problem that the double-system refrigerator needs to stop the compressor during the defrosting process, and the refrigerant remaining in the evaporator after stopping absorbs heat, resulting in low efficiency of the defrosting process.

[0005] To solve the above technical problems, the technical scheme of the present application is as follows:

[0006] The embodiment of the present application provides a refrigeration unit, which comprises: a ring-shaped refrigerant pipeline, a bypass refrigerant pipeline, a compressor, a condenser, an evaporator group and a controller; the ring-shaped refrigerant pipeline is sequentially connected with the compressor, the condenser and the evaporator group and returns to the compressor; the evaporator group comprises a connected first evaporator and a second evaporator; the inlet of the bypass refrigerant pipeline is connected with the ring-shaped refrigerant pipeline between the compressor and the condenser, and the outlet is connected with the first evaporator and the second evaporator; and the controller is used to control the on-off state of each connection point of the ring-shaped refrigerant pipeline and the bypass refrigerant pipeline.

[0007] The refrigerating unit further comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic valve; the bypass refrigerant pipeline comprises a first bypass pipeline and a second bypass pipeline; the annular refrigerant pipeline comprises a first refrigerant pipeline, a second refrigerant pipeline, a third refrigerant pipeline and a fourth refrigerant pipeline; a first end of the first bypass pipeline is connected to the annular refrigerant pipeline between the compressor and the condenser through the first electromagnetic valve; a second end of the first bypass pipeline is connected to the second refrigerant pipeline and a first end of the second bypass pipeline through the second electromagnetic valve respectively; a second end of the second bypass pipeline is connected to an inlet of the second evaporator through the third electromagnetic valve; first ends of the first refrigerant pipeline, the second refrigerant pipeline and the third refrigerant pipeline are connected through the fourth electromagnetic valve; a second end of the first refrigerant pipeline is connected to one end of the condenser; a second end of the second refrigerant pipeline is connected to an inlet of the second evaporator; a second end of the third refrigerant pipeline is connected to an inlet of the first evaporator; a first end of the fourth refrigerant pipeline is connected to the third refrigerant pipeline, and a second end thereof is connected to an outlet of the second evaporator and a gas return pipe of the second evaporator through the fifth electromagnetic valve; the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve adjust the on-off state of each port under the control of the controller.

[0008] The refrigerating unit further comprises a heating wire wound on the first bypass pipeline; the heating wire adjusts the heating state under the control of the controller.

[0009] The application further provides a control method of a refrigerating unit, and the control method comprises the following steps: determining a demand mode corresponding to the refrigerating unit by monitoring unit data of the refrigerating unit; the demand mode comprises a defrosting mode and a refrigerating mode; when it is determined that the refrigerating mode corresponds to the refrigerating unit, controlling an inlet of a bypass refrigerant pipeline to disconnect an annular refrigerant pipeline and controlling the annular refrigerant pipeline to communicate two evaporators; when it is determined that the defrosting mode corresponds to the refrigerating unit, controlling the inlet of the bypass refrigerant pipeline to communicate the annular refrigerant pipeline; controlling an outlet of the bypass refrigerant pipeline to communicate an evaporator to be defrosted and disconnect an evaporator to be refrigerated; and controlling the annular refrigerant pipeline to disconnect the evaporator to be defrosted and communicate the evaporator to be refrigerated.

[0010] The determination of the demand mode corresponding to the refrigeration unit based on the monitoring of the unit data of the refrigeration unit comprises: reading the room temperature and the frost thickness corresponding to each evaporator in the unit data; determining the refrigeration mode corresponding to the refrigeration unit in the case that the room temperature corresponding to at least one of the evaporators is greater than the preset temperature corresponding to the evaporator; and determining the defrosting mode corresponding to the refrigeration unit in the case that the frost thickness corresponding to at least one of the evaporators is greater than the thickness threshold value corresponding to the evaporator.

[0011] The control of the bypass refrigerant pipeline, the disconnection of the ring-shaped refrigerant pipeline and the connection of the ring-shaped refrigerant pipeline to the two evaporators comprises: reading the running time of the compressor in the unit data; controlling the first electromagnetic valve to connect the ring-shaped refrigerant pipeline and block the first end of the first bypass pipeline in the case that the running time of the compressor is less than the preset running time threshold value; controlling the fourth electromagnetic valve to connect the first end of the first refrigerant pipeline and the first end of the second refrigerant pipeline and block the first end of the third refrigerant pipeline; controlling the fifth electromagnetic valve to connect the outlet of the second evaporator and the second end of the fourth refrigerant pipeline; controlling the third electromagnetic valve to connect the first end of the fourth refrigerant pipeline and the inlet of the first evaporator and block the second end of the second bypass pipeline; controlling the first electromagnetic valve to connect the ring-shaped refrigerant pipeline and block the first end of the first bypass pipeline in the case that the running time of the compressor is greater than or equal to the running time threshold value; controlling the fourth electromagnetic valve to connect the first end of the first refrigerant pipeline, the first end of the second refrigerant pipeline and the first end of the third refrigerant pipeline; controlling the fifth electromagnetic valve to connect the outlet of the second evaporator and the ring-shaped refrigerant pipeline and block the second end of the fourth refrigerant pipeline; and controlling the third electromagnetic valve to block the first end of the fourth refrigerant pipeline and block the second end of the second bypass pipeline.

[0012] The control of the inlet of the bypass refrigerant pipeline in communication with the annular refrigerant pipeline; the control of the outlet of the bypass refrigerant pipeline in communication with the evaporator to be defrosted, and the disconnection of the evaporator to be refrigerated; and the control of the annular refrigerant pipeline in disconnection with the evaporator to be defrosted and in communication with the evaporator to be refrigerated, comprises: in the case that the first evaporator is the evaporator to be defrosted and the second evaporator is the evaporator to be refrigerated, the control of the first electromagnetic valve in communication with the annular refrigerant pipeline and the first end of the first bypass pipeline; the control of the second electromagnetic valve in communication with the second end of the first bypass pipeline and the first end of the second bypass pipeline, and the blocking of the communication with the inlet of the second evaporator; the control of the third electromagnetic valve in communication with the second end of the second bypass pipeline and the inlet of the first evaporator, and the blocking of the first end of the fourth refrigerant pipeline 12; and the control of the fourth electromagnetic valve in communication with the first end of the first refrigerant pipeline and the first end of the second refrigerant pipeline, and the blocking of the first end of the third refrigerant pipeline; in the case that the first evaporator is the evaporator to be refrigerated and the second evaporator is the evaporator to be defrosted, the control of the first electromagnetic valve in communication with the annular refrigerant pipeline and the first end of the first bypass pipeline; the control of the second electromagnetic valve in communication with the inlet of the second evaporator and the disconnection of the first end of the second bypass pipeline; the control of the fourth electromagnetic valve in communication with the first end of the first refrigerant pipeline and the first end of the third refrigerant pipeline, and the blocking of the first end of the second refrigerant pipeline; and the control of the fifth electromagnetic valve in communication with the outlet of the second evaporator and the port of the annular refrigerant pipeline, and the blocking of the second port of the fourth refrigerant pipeline.

[0013] Before the control of the inlet of the bypass refrigerant pipeline in communication with the annular refrigerant pipeline; the control of the outlet of the bypass refrigerant pipeline in communication with the evaporator to be defrosted, and the disconnection of the evaporator to be refrigerated; and the control of the annular refrigerant pipeline in disconnection with the evaporator to be defrosted and in communication with the evaporator to be refrigerated, it further comprises: in the case that the frost thickness of one of the evaporators is greater than the corresponding thickness threshold, determining the one of the evaporators as the evaporator to be defrosted and the other evaporator as the evaporator to be refrigerated between the two evaporators; in the case that the frost thickness of both of the evaporators is greater than the corresponding thickness threshold, reading the refrigeration time of each evaporator in the unit data; in the case that the refrigeration time of the first evaporator is greater than the preset refrigeration time threshold, determining the first evaporator as the evaporator to be defrosted and the second evaporator as the evaporator to be refrigerated; and in the case that the refrigeration time of the second evaporator is greater than the preset refrigeration time threshold, determining the first evaporator as the evaporator to be refrigerated and the second evaporator as the evaporator to be defrosted.

[0014] The method further comprises: after controlling the outlet of the bypass refrigerant pipeline to communicate with the evaporator to be defrosted, controlling the heating wire wound on the first bypass pipeline to start heating when the exhaust temperature of the compressor is monitored to be less than a preset exhaust temperature threshold.

[0015] The embodiment of the present application further provides a control device of a refrigeration unit, which is arranged in the controller and comprises: a data determination module, configured to determine a demand mode corresponding to the refrigeration unit by monitoring unit data of the refrigeration unit; wherein the demand mode comprises a defrosting mode and a refrigeration mode; a first control module, configured to control an inlet of a bypass refrigerant pipeline to disconnect a loop refrigerant pipeline and control the loop refrigerant pipeline to communicate with two evaporators when it is determined that the refrigeration unit corresponds to the refrigeration mode; and a second control module, configured to control the inlet of the bypass refrigerant pipeline to communicate with the loop refrigerant pipeline, control an outlet of the bypass refrigerant pipeline to communicate with the evaporator to be defrosted, disconnect the evaporator to be refrigerated, control the loop refrigerant pipeline to disconnect the evaporator to be defrosted and communicate with the evaporator to be refrigerated when it is determined that the refrigeration unit corresponds to the defrosting mode.

[0016] The embodiment of the present application further provides a control device of a refrigeration unit, which comprises: at least one communication interface; at least one bus connected with the at least one communication interface; at least one processor connected with the at least one bus; and at least one memory connected with the at least one bus, wherein the processor is configured to execute a control program of the refrigeration unit stored in the memory to realize the control method of the refrigeration unit.

[0017] The embodiment of the present application further provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are executed to realize the control method of the refrigeration unit.

[0018] The technical scheme provided by the embodiment of the present application has the following advantages compared with the prior art: the refrigerating unit provided by the embodiment of the present application comprises a ring-shaped refrigerant pipeline, a bypass refrigerant pipeline, a compressor, a condenser, an evaporator group and a controller; the ring-shaped refrigerant pipeline is sequentially connected with the compressor, the condenser and the evaporator group and returns to the compressor; the evaporator group comprises a connected first evaporator and a second evaporator; the bypass refrigerant pipeline is connected with the ring-shaped refrigerant pipeline between the compressor and the condenser at an inlet and connected with the first evaporator and the second evaporator at an outlet; and the controller is used for controlling the on-off state of each connection point of the ring-shaped refrigerant pipeline and the bypass refrigerant pipeline. The embodiment of the present application provides the possibility of guiding high-temperature refrigerant to the evaporator by arranging the bypass refrigerant pipeline between the compressor and the condenser; the on-off state of the bypass refrigerant pipeline is adjusted, so that the refrigerant can be switched to the flow path of the evaporator which needs to defrost; and based on the structure, one evaporator defrosts and the other evaporator refrigerates without stopping the compressor, thereby avoiding the problem that the refrigerant stays in the evaporator to absorb heat after the compressor stops, improving the defrosting efficiency, and continuously providing refrigerating capacity during the defrosting process, thereby avoiding large temperature fluctuations in the interchamber. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings incorporated into the specification and forming a part thereof show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor under the premise of not paying the creative labor.

[0021] One or more embodiments are exemplarily illustrated by the pictures in the drawings corresponding thereto, and the exemplarily illustrations do not constitute a limitation on the embodiments, and the elements with the same reference numerals in the drawings represent the similar elements, unless otherwise specified, and the drawings do not constitute a proportional limitation.

[0022] Figure 1 It is a structural diagram of the refrigerating unit according to an embodiment of the present application;

[0023] Figure 2 It is a structural diagram of the refrigerating unit according to an embodiment of the present application;

[0024] Figure 3 It is a specific structural diagram of the refrigerating unit according to an embodiment of the present application;

[0025] Figure 4Flow chart of the control method of the refrigerating unit according to an embodiment of the present application;

[0026] Figure 5 Flow chart of the control method of the refrigerating unit according to an embodiment of the present application;

[0027] Figure 6 Structure diagram of the evaporator group in series according to an embodiment of the present application;

[0028] Figure 7 Structure diagram of the evaporator group in parallel according to an embodiment of the present application;

[0029] Figure 8 Flow chart of the control method of the refrigerating unit according to an embodiment of the present application;

[0030] Figure 9 Structure diagram of the refrigerating unit when defrosting the first evaporator according to an embodiment of the present application;

[0031] Figure 10 Structure diagram of the refrigerating unit when defrosting the second evaporator according to an embodiment of the present application;

[0032] Figure 11 Structure diagram of the control device of the refrigerating unit according to an embodiment of the present application;

[0033] Figure 12 Structure diagram of the control device of the refrigerating unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and it does not indicate the relationship between the various embodiments and / or settings discussed.

[0036] The embodiments of the present application provide a refrigerating unit. As shown in Figure 1As shown in the figure, it is a structural diagram of a refrigeration unit according to an embodiment of the present application.

[0037] In the embodiment of the present application, the refrigeration unit at least includes: an annular refrigerant pipeline (thick solid line in the figure), a bypass refrigerant pipeline (thick dashed line in the figure), a compressor 1, a condenser 3, an evaporator group, and a controller (not shown in the figure). Wherein, the condenser 3 can be correspondingly provided with a condenser fan 2.

[0038] The annular refrigerant pipeline is sequentially connected to the compressor 1, the condenser 3, and the evaporator group and returns to the compressor 1; the evaporator group includes a connected first evaporator 4 and a second evaporator 5. Further, the evaporator group includes the first evaporator 4 and the second evaporator 5 which are switchable in series and parallel.

[0039] The bypass refrigerant pipeline is connected to the annular refrigerant pipeline between the compressor 1 and the condenser 3 at the inlet and connected to the first evaporator 4 and the second evaporator 5 at the outlet. Wherein, the first evaporator 4 is, for example, a freezing evaporator. The second evaporator 5 is, for example, a refrigerating evaporator.

[0040] The controller is used to control the on-off state of each connection point of the annular refrigerant pipeline and the bypass refrigerant pipeline.

[0041] In the embodiment of the present application, since the above-mentioned connection refers to the existence of a connection point, but does not mean that it is connected. Therefore, the embodiment of the present application can use a solenoid valve to adjust the on-off state (connected state or disconnected state) of the connection point. In order to make each port of each solenoid valve in the refrigeration unit more clear, the connection points of the annular refrigerant pipeline and the bypass refrigerant pipeline are described in combination with the ports of the solenoid valve. Figure 2 and Figure 3 The structure of the refrigeration unit according to the embodiment of the present application is described.

[0042] As shown in the figure, it is a structural diagram of a refrigeration unit according to an embodiment of the present application. Figure 2 As shown in the figure, it is a structural diagram of a refrigeration unit according to an embodiment of the present application.

[0043] The bypass refrigerant pipeline includes a first bypass pipeline 6 and a second bypass pipeline 7.

[0044] The refrigeration unit further includes a first solenoid valve 81, a second solenoid valve 82, a third solenoid valve 83, a fourth solenoid valve 84, and a fifth solenoid valve 85.

[0045] The annular refrigerant pipeline includes a first refrigerant pipeline 9, a second refrigerant pipeline 10, a third refrigerant pipeline 11, and a fourth refrigerant pipeline 12.

[0046] The first end of the first bypass pipeline 6 is connected to the annular refrigerant pipeline between the compressor 1 and the condenser 3 through the first electromagnetic valve 81; the second end of the first bypass pipeline 6 is connected to the second refrigerant pipeline 10 and the first end of the second bypass pipeline 7 through the second electromagnetic valve 82; the second end of the second bypass pipeline 7 is connected to the inlet of the second evaporator 5 through the third electromagnetic valve 83.

[0047] The first ends of the first refrigerant pipeline 9, the second refrigerant pipeline 10 and the third refrigerant pipeline 11 are connected through the fourth electromagnetic valve 84; the second end of the first refrigerant pipeline 9 is connected to one end of the condenser 3; the second end of the second refrigerant pipeline 10 is connected to the inlet of the second evaporator 5; the second end of the third refrigerant pipeline 11 is connected to the inlet of the first evaporator 4.

[0048] The first end of the fourth refrigerant pipeline 12 is connected to the third refrigerant pipeline 11, and the second end is connected to the outlet of the second evaporator 5 and the gas return pipe of the second evaporator 5 through the fifth electromagnetic valve 85.

[0049] The first electromagnetic valve 81, the second electromagnetic valve 82, the third electromagnetic valve 83, the fourth electromagnetic valve 84 and the fifth electromagnetic valve 85 adjust the on-off state of each port under the control of the controller.

[0050] In the embodiment of the present application, the refrigerating unit can further comprise a heating wire 13 wound on the first bypass pipeline 6; the heating state of the heating wire 13 is adjusted under the control of the controller. The heating state includes heating and non-heating. Further, after the evaporator enters the defrosting mode, the heating energy provided by the heating wire 13 can be adjusted by adjusting the current value of the heating wire 13.

[0051] As shown in Figure 3 FIG. 1 is a specific structural diagram of a refrigerating unit according to an embodiment of the present application.

[0052] In the embodiment of the present application, the first electromagnetic valve 81, the second electromagnetic valve 82, the third electromagnetic valve 83, the fourth electromagnetic valve 84 and the fifth electromagnetic valve 85 are all electromagnetic valves with at least three ports. For example, the first electromagnetic valve 81, the second electromagnetic valve 82, the third electromagnetic valve 83, the fourth electromagnetic valve 84 and the fifth electromagnetic valve 85 are all three-way electromagnetic valves.

[0053] The first outlet 81A of the first electromagnetic valve 81 is connected to the annular refrigerant pipeline of the outlet of the exhaust pipe of the compressor 1, the second outlet 81B of the first electromagnetic valve 81 is connected to the annular refrigerant pipeline of the inlet of the condenser 3, and the third outlet 81C of the first electromagnetic valve 81 is connected to the first end of the first bypass pipeline 6. The heating wire 13 is wound at the middle pipeline of the first bypass pipeline 6.

[0054] The first outlet 82A of the second electromagnetic valve 82 is connected to the second end of the first bypass pipeline 6, the second outlet 82B of the second electromagnetic valve 82 is connected to the inlet of the first evaporator 4, and the third outlet 82C of the second electromagnetic valve 82 is connected to the first end of the second bypass pipeline 7.

[0055] The first outlet 83A of the third electromagnetic valve 83 is connected to the first end of the fourth refrigerant pipeline 12, the second outlet 83B of the third electromagnetic valve 83 is connected to the second end of the second bypass pipeline 7, and the third outlet 83C of the third electromagnetic valve 83 is connected to the inlet of the first evaporator 4.

[0056] The first outlet 84A of the fourth electromagnetic valve 84 is connected to the first end of the first refrigerant pipeline 9 (corresponding to the outlet of the condenser 3), the second outlet 84B of the fourth electromagnetic valve 84 is connected to the first end of the third refrigerant pipeline 11 (corresponding to the inlet of the first evaporator 4), and the third outlet 84C of the fourth electromagnetic valve 84 is connected to the first end of the second refrigerant pipeline 10 (corresponding to the inlet of the second evaporator 5).

[0057] The first outlet 85A of the fifth electromagnetic valve 85 is connected to the return pipe of the second evaporator 5, the second outlet 85B of the fifth electromagnetic valve 85 is connected to the outlet of the second evaporator 5, and the third outlet 85C of the fifth electromagnetic valve 85 is connected to the second end of the fourth refrigerant pipeline 12. The return pipes of the first evaporator 4 and the second evaporator 5 are combined as part of the annular refrigerant pipeline and connected to the inlet of the compressor 1.

[0058] In the embodiment of the present application, the controller can switch the series-parallel state of the first evaporator 4 and the second evaporator 5 by controlling the on-off state of each port of the third electromagnetic valve 83, the fourth electromagnetic valve 84 and the fifth electromagnetic valve 85. By switching the series-parallel state of the first evaporator 4 and the second evaporator 5 and combining the control of the on-off state of each port of the first electromagnetic valve 81 and the second electromagnetic valve 82, the working mode of the first evaporator 4 and the second evaporator 5 can be switched. The working mode includes a refrigeration mode and a defrosting mode.

[0059] The refrigeration unit provided by the embodiment of the present application sequentially connects the compressor, the condenser and the evaporator group through the annular refrigerant pipeline and returns to the compressor; the evaporator group comprises a connected first evaporator and a second evaporator; the inlet of the bypass refrigerant pipeline is connected to the annular refrigerant pipeline between the compressor and the condenser, and the outlet is connected to the first evaporator and the second evaporator; and the controller is used to control the on-off state of each connection point of the annular refrigerant pipeline and the bypass refrigerant pipeline. The embodiment of the present application provides the possibility of guiding high-temperature refrigerant to the evaporator by arranging the bypass refrigerant pipeline between the compressor and the condenser, and adjusting the on-off state of the bypass refrigerant pipeline can make the refrigerant switch to the flow path of the evaporator that needs defrosting, and based on this structure, one evaporator defrosts and the other evaporator refrigerates without stopping the compressor, thereby avoiding the problem that the refrigerant stays in the evaporator to absorb heat after the compressor stops, improving the defrosting efficiency, and continuously providing refrigeration capacity during the defrosting process to avoid large temperature fluctuations in the inter-room.

[0060] Based on this, the embodiment of the present application provides a control method of a refrigeration unit. As shown in the figure, it is a flow chart of the control method of the refrigeration unit according to an embodiment of the present application. Figure 4

[0061] Step S410, determine the demand mode corresponding to the refrigeration unit by monitoring the unit data of the refrigeration unit; wherein the demand mode comprises a defrosting mode and a refrigeration mode.

[0062] The demand mode refers to the working mode to be entered by the refrigeration unit.

[0063] The defrosting mode refers to the existence of an evaporator that needs to be defrosted in the refrigeration unit.

[0064] The refrigeration mode refers to the need for refrigeration of both evaporators in the refrigeration unit.

[0065] Step S420, determine whether the refrigeration unit corresponds to the refrigeration mode; if yes, execute step S430; if no, execute step S440.

[0066] Step S430, when it is determined that the refrigeration unit corresponds to the refrigeration mode, control the inlet of the bypass refrigerant pipeline to disconnect the annular refrigerant pipeline and control the annular refrigerant pipeline to communicate with the two evaporators.

[0067] After the inlet of the bypass refrigerant pipeline is disconnected from the annular refrigerant pipeline, all the refrigerant output by the compressor 1 first passes through the condenser 3 and then enters the two evaporators, thereby realizing the refrigeration function.

[0068] ​Step S440, when determining that the refrigeration unit corresponds to the defrosting mode, controlling the inlet of the bypass refrigerant pipeline to communicate with the annular refrigerant pipeline; controlling the outlet of the bypass refrigerant pipeline to communicate with the evaporator to be defrosted and disconnect the evaporator to be refrigerated; controlling the annular refrigerant pipeline to disconnect the evaporator to be defrosted and communicate with the evaporator to be refrigerated.

[0069] After the inlet of the bypass refrigerant pipeline communicates with the annular refrigerant pipeline, at the first electromagnetic valve 81, the refrigerant output by the compressor 1 will be divided, part of the refrigerant enters the evaporator corresponding to the defrosting mode, and the other part of the refrigerant enters the evaporator of the refrigeration mode after passing through the condenser 3. The refrigerant that does not pass through the condenser 3 is high-temperature refrigerant, which can melt the frost layer at the evaporator corresponding to the defrosting mode, and the refrigerant flowing through the condenser 3 can be condensed to realize refrigeration at the evaporator corresponding to the refrigeration mode, thereby realizing refrigeration at the evaporator corresponding to the refrigeration mode. In this way, one evaporator can be defrosted while the other evaporator can continue to refrigerate.

[0070] In the embodiment of the present application, the unit data of the refrigeration unit is monitored to determine the demand mode corresponding to the refrigeration unit; wherein the demand mode includes: defrosting mode and refrigeration mode; when it is determined that the refrigeration unit corresponds to the refrigeration mode, the inlet of the bypass refrigerant pipeline is disconnected from the annular refrigerant pipeline and the annular refrigerant pipeline is controlled to communicate with the two evaporators; when it is determined that the refrigeration unit corresponds to the defrosting mode, the inlet of the bypass refrigerant pipeline is controlled to communicate with the annular refrigerant pipeline; the outlet of the bypass refrigerant pipeline is controlled to communicate with the evaporator to be defrosted and disconnect the evaporator to be refrigerated; the annular refrigerant pipeline is controlled to disconnect the evaporator to be defrosted and communicate with the evaporator to be refrigerated. The embodiment of the present application provides the possibility of introducing high-temperature refrigerant to the evaporator by arranging the bypass refrigerant pipeline between the compressor 1 and the condenser 3, and adjusts the on-off state of the bypass refrigerant pipeline according to the demand mode change of the evaporator, so that the refrigerant is switched to the flow path corresponding to the demand mode. In the defrosting mode, the compressor 1 does not need to stop, one of the evaporators is defrosted, and the other evaporator is refrigerated, which avoids the problem that the refrigerant stays in the evaporator after the compressor 1 stops, thereby improving the defrosting efficiency, and continuously providing refrigeration capacity during the defrosting process, thereby avoiding large temperature fluctuations in the chamber.

[0071] In order to make the embodiment of the present application clearer, the control method of the refrigeration unit of the embodiment of the present application will be further described below.

[0072] In the embodiment of the present application, the unit data of the refrigeration unit is monitored in real time, so as to determine whether the demand mode corresponding to the two evaporators in the refrigeration unit changes, and control the on-off state of each port according to the unit data of the refrigeration unit.

[0073] The unit data includes, but is not limited to, the chamber temperature corresponding to each evaporator, the frost thickness, the refrigeration duration, and the operation duration of the compressor 1.

[0074] The chamber temperature refers to the temperature in the chamber corresponding to the evaporator.

[0075] The frost thickness refers to the thickness of the frost formed on the surface of the evaporator.

[0076] The refrigeration duration of the evaporator refers to the length of time from when the evaporator starts refrigeration to the current time.

[0077] The operation duration of the compressor 1 refers to the length of time from when the compressor 1 is started to the current time.

[0078] In the embodiments of the present application, the chamber temperature and the frost thickness included in the unit data can be read in real time to determine whether the demand mode of the refrigeration unit has changed.

[0079] The demand mode of the refrigeration unit includes a refrigeration mode and a defrosting mode. The refrigeration mode refers to the situation in which both evaporators in the refrigeration unit need to be refrigerated. The defrosting mode refers to the situation in which at least one evaporator in the refrigeration unit needs to be defrosted.

[0080] Specifically, in the unit data, the chamber temperature and the frost thickness corresponding to each evaporator are read. In a case where the chamber temperature corresponding to at least one evaporator is greater than the preset temperature corresponding to the evaporator, it is determined that the refrigeration unit corresponds to the refrigeration mode. In a case where the frost thickness corresponding to at least one evaporator is greater than the thickness threshold value corresponding to the evaporator, it is determined that the refrigeration unit corresponds to the defrosting mode.

[0081] Further, since the chambers corresponding to the two evaporators are adjacent, in a case where the chamber temperature corresponding to at least one evaporator is greater than the preset temperature corresponding to the evaporator, both evaporators need to be refrigerated in order to avoid temperature fluctuations between the chambers.

[0082] Further, in a case where it is determined that the chamber temperature corresponding to each of the two evaporators is less than or equal to the preset temperature corresponding to the evaporator, and the frost thickness corresponding to each of the two evaporators is less than the thickness threshold value corresponding to the evaporator, in order to ensure normal operation of the refrigeration unit, it can be determined that the refrigeration unit corresponds to the refrigeration mode.

[0083] Further, the priority of the defrosting mode is higher than that of the refrigeration mode. Thus, in a case where it is determined that the demand mode of the refrigeration unit meets both the refrigeration mode and the defrosting mode, it is determined that the refrigeration unit switches to the defrosting mode.

[0084] In the embodiments of the present application, the controller can control the first evaporator 4 and the second evaporator 5 to be in series or parallel connection in the case that the corresponding refrigeration mode of the refrigeration unit is determined.

[0085] In other words, the controller can control the first evaporator 4 and the second evaporator 5 to switch to the series connection state or the parallel connection state in the case that the demand mode of the refrigeration unit corresponds to the refrigeration mode, and make the refrigerant circulate along the refrigeration flow path.

[0086] Specifically, since the demand for refrigeration is different in different operation stages of the refrigeration unit, for example, rapid refrigeration is required in the initial stage and load dispersion is required in the stable stage, and the operation time of the compressor 1 can reflect the operation stage of the refrigeration unit, the controller can read the operation time of the compressor 1 in the unit data, control the first evaporator 4 and the second evaporator 5 to switch to the series connection state in the case that the operation time of the compressor 1 is less than a pre-set operation time threshold, and control the first evaporator 4 and the second evaporator 5 to switch to the parallel connection state in the case that the operation time of the compressor 1 is greater than or equal to the operation time threshold.

[0087] Further, in the case that the operation time of the compressor 1 is less than the pre-set operation time threshold, the controller controls the first electromagnetic valve 81 to connect the annular refrigerant pipeline and block the first end of the first bypass pipeline 6, controls the fourth electromagnetic valve 84 to connect the first end of the first refrigerant pipeline 9 and the first end of the second refrigerant pipeline 10 and block the first end of the third refrigerant pipeline 11, controls the fifth electromagnetic valve 85 to connect the outlet of the second evaporator 5 and the second end of the fourth refrigerant pipeline 12, and controls the third electromagnetic valve 83 to connect the first end of the fourth refrigerant pipeline 12 and the inlet of the first evaporator 4 and block the second end of the second bypass pipeline 7.

[0088] Based on this connection mode, the first evaporator 4 and the second evaporator 5 are in the series connection state, and the refrigerant output by the compressor 1 sequentially passes through the condenser 3, the fourth electromagnetic valve 84, the second evaporator 5, the third electromagnetic valve 83, and the first evaporator 4 and then flows back to the compressor 1. The operation time of the compressor 1 is less than the operation time threshold, indicating that the compressor 1 is in the low load stage in the initial start-up period. In the series connection state, the refrigerant sequentially flows through the second evaporator 5 and the first evaporator 4, and the refrigerant is not branched, so that the cold energy can be concentrated to rapidly cool the two compartments, the refrigeration temperature demand of the two compartments is met, and energy waste is avoided.

[0089] Further, in a case where it is determined that the running duration of the compressor 1 is greater than or equal to the running duration threshold, the first electromagnetic valve 81 is controlled to be connected to the annular refrigerant pipeline and to block the first end of the first bypass pipeline 6; the fourth electromagnetic valve 84 is controlled to be connected to the first end of the first refrigerant pipeline 9, the first end of the second refrigerant pipeline 10, and the first end of the third refrigerant pipeline 11; the fifth electromagnetic valve 85 is controlled to be connected to the outlet of the second evaporator 5 and the annular refrigerant pipeline and to block the second end of the fourth refrigerant pipeline 12; and the third electromagnetic valve 83 is controlled to block the first end of the fourth refrigerant pipeline 12 and to block the second end of the second bypass pipeline 7.

[0090] Based on the connection mode, the first evaporator 4 and the second evaporator 5 are in a parallel state, and the refrigerant output from the compressor 1 sequentially passes through the condenser 3 and the fourth electromagnetic valve 84, is branched from the fourth electromagnetic valve 84 to the second refrigerant pipeline 10 and the third refrigerant pipeline 11, and then passes through the first evaporator 4 and the second evaporator 5, respectively, and is then merged into the annular refrigerant pipeline and returned to the compressor 1. The running duration of the compressor 1 being greater than or equal to the running duration threshold indicates that the compressor 1 has started stable operation, and in the parallel state, the refrigerant flows through the first evaporator 4 and the second evaporator 5 in two branches, so that the first evaporator 4 and the second evaporator 5 can independently refrigerate, and thus the refrigeration temperature can be maintained relatively stable even in a case where one of the evaporators is overloaded, for example, in a case where the user frequently opens and closes the door.

[0091] In the embodiment of the present application, in a case where the demand mode of the refrigeration unit corresponds to the defrosting mode, the controller can introduce the high-temperature refrigerant output from the compressor 1 into the evaporator that needs to be defrosted by using the bypass refrigerant pipeline, so as to melt the frost layer.

[0092] Specifically, the present application defrosts one evaporator at a time to avoid large temperature fluctuations in the refrigeration unit, and thus, before defrosting one of the evaporators by using the bypass refrigerant pipeline, the evaporator to be defrosted and the evaporator to be refrigerated need to be determined.

[0093] In a case where the frost layer thickness of one of the evaporators is greater than the corresponding thickness threshold, the one evaporator is determined to be the evaporator to be defrosted and the other evaporator is determined to be the evaporator to be refrigerated between the two evaporators. That is, the evaporator with the frost layer thickness greater than the corresponding thickness threshold is determined to be the evaporator to be defrosted, and the other evaporator with the frost layer thickness less than or equal to the corresponding thickness threshold can be determined to be the evaporator to be refrigerated.

[0094] In the case that the frost thickness of both of the evaporators is greater than the respective corresponding thickness threshold, since the refrigeration time length of the evaporator can reflect the frosting degree, i.e., the longer the refrigeration time length, the more serious the frosting degree can be, the evaporator to be refrigerated and the evaporator to be defrosted can be determined according to the refrigeration time length of each evaporator.

[0095] Further, in the case that the refrigeration time length of the first evaporator 4 is greater than the preset refrigeration time length threshold, the first evaporator 4 is determined to be the evaporator to be defrosted and the second evaporator 5 is determined to be the evaporator to be refrigerated.

[0096] Further, in the case that the refrigeration time length of the second evaporator 5 is greater than the preset refrigeration time length threshold, the first evaporator 4 is determined to be the evaporator to be refrigerated and the second evaporator 5 is determined to be the evaporator to be defrosted.

[0097] In the case that the first evaporator 4 is the evaporator to be defrosted and the second evaporator 5 is the evaporator to be refrigerated, the first electromagnetic valve 81 can be controlled to be connected to the annular refrigerant pipeline and the first end of the first bypass pipeline 6; the second electromagnetic valve 82 can be controlled to be connected to the second end of the first bypass pipeline 6 and the first end of the second bypass pipeline 7, and blocked from being connected to the inlet of the second evaporator 5; the third electromagnetic valve 83 can be controlled to be connected to the second end of the second bypass pipeline 7 and the inlet of the first evaporator 4, and blocked from being connected to the first end of the fourth refrigerant pipeline 12; and the fourth electromagnetic valve 84 can be controlled to be connected to the first end of the first refrigerant pipeline 9 and the first end of the second refrigerant pipeline 10, and blocked from being connected to the first end of the third refrigerant pipeline 11.

[0098] In the case that the first evaporator 4 is the evaporator to be refrigerated and the second evaporator 5 is the evaporator to be defrosted, the first electromagnetic valve 81 can be controlled to be connected to the annular refrigerant pipeline and the first end of the first bypass pipeline 6; the second electromagnetic valve 82 can be controlled to be connected to the inlet of the second evaporator 5, and disconnected from the first end of the second bypass pipeline 7; the fourth electromagnetic valve 84 can be controlled to be connected to the first end of the first refrigerant pipeline 9 and the first end of the third refrigerant pipeline 11, and blocked from being connected to the first end of the second refrigerant pipeline 10; and the fifth electromagnetic valve 85 can be controlled to be connected to the outlet of the second evaporator 5 and the port of the annular refrigerant pipeline, and blocked from being connected to the second port of the fourth refrigerant pipeline 12.

[0099] In the embodiments of the present application, since the outlet of the evaporator to be defrosted is connected to the compressor 1, the phase of the refrigerant output from the compressor 1 to the evaporator to be defrosted does not change.

[0100] The first electromagnetic valve 81 can be controlled to have an outlet opening degree connected to the first bypass pipeline 6, and the outlet opening degree is less than or equal to a preset opening degree threshold. The opening degree threshold is used to measure whether the refrigerant output by the compressor 1 will be liquefied after reaching the evaporator to be defrosted. When the outlet opening degree is less than or equal to the opening degree threshold, the refrigerant remains in a gaseous state in the evaporator to be defrosted. When the outlet opening degree is greater than the opening degree threshold, the refrigerant will have a problem of changing from a gaseous state to a liquid state in the evaporator to be defrosted.

[0101] Further, a plurality of frost thickness intervals can be pre-divided, and each frost thickness interval corresponds to an outlet opening degree; among the outlet opening degrees corresponding to each frost thickness interval, the largest outlet opening degree is equal to the opening degree threshold, and the greater the value of the frost thickness interval, the greater the corresponding outlet opening degree; the smaller the value of the frost thickness interval, the smaller the corresponding outlet opening degree. When the first electromagnetic valve 81 is connected to the first bypass pipeline 6, the frost thickness interval to which the frost thickness corresponding to the evaporator to be defrosted belongs can be determined, and the outlet opening degree is adjusted to the outlet opening degree corresponding to the thickness interval.

[0102] In the embodiment of the present application, after the outlet of the bypass refrigerant pipeline is controlled to be connected to the evaporator to be defrosted, the exhaust temperature of the compressor 1 can be monitored in real time; in the case that the exhaust temperature of the compressor 1 is less than a preset exhaust temperature threshold, the heating wire 13 wound on the first bypass pipeline 6 is controlled to start heating.

[0103] The exhaust temperature refers to the temperature of the refrigerant gas discharged by the compressor 1.

[0104] When the exhaust temperature is less than the exhaust temperature threshold, it indicates that the temperature of the refrigerant is low and cannot guarantee the effective defrosting of the frost layer on the evaporator. Therefore, when the exhaust temperature is less than the exhaust temperature threshold, the heating wire 13 can be used to heat the refrigerant in the first bypass pipeline 6 to ensure the defrosting effect on the evaporator.

[0105] In order to make the embodiment of the present application easier to understand, a more specific example is given below to illustrate the specific process of the control method of the refrigeration unit according to the embodiment of the present application. Figure 3 A more specific example is given below to illustrate the specific process of the control method of the refrigeration unit according to the embodiment of the present application.

[0106] As shown in FIG. 6, it is a control flow chart of the refrigeration unit according to the embodiment of the present application, which switches from the demand mode to the refrigeration mode. Figure 5

[0107] Step S510, the refrigeration unit starts running.

[0108] Step S520, real-time monitoring of the unit data of the refrigeration unit; wherein the unit data includes: the room temperature T1 corresponding to the first evaporator, the room temperature T2 corresponding to the second evaporator, and the running time t of the compressor 1. ​

[0109] Step S530, compare the intermediate chamber temperature T1 with the preset temperature Tc corresponding to the first evaporator and compare the intermediate chamber temperature T2 with the preset temperature Td corresponding to the second evaporator.

[0110] Step S540, determine whether T1 > T and / or T2 > Td occurs; if yes, execute step S550; if no, execute step S590.

[0111] In the case of determining T1≤Tc and T2≤Td, in order to keep the refrigeration unit stable operation and provide refrigeration capacity, the inlet of the bypass refrigerant pipeline is connected to the annular refrigerant pipeline and the first evaporator 4 and the second evaporator 5 in parallel state are connected to the annular refrigerant pipeline.

[0112] Further, in the case of determining T1≤Tc and T2≤Td, the outlet opening of each electromagnetic valve can be adjusted according to the preset gradient value.

[0113] Step S550, in the case of T1 > Tc and / or T2 > Td, determine that the demand mode of the refrigeration unit switches to the refrigeration mode.

[0114] Step S560, compare the running time t with the preset running time threshold tc.

[0115] Step S570, determine whether t < tc; if yes, execute step S580; if no, execute step S590.

[0116] The running time t less than the preset running time threshold tc can indicate that the refrigeration unit is in the low load running stage in the early stage of startup.

[0117] The running time t greater than or equal to the running time threshold tc can indicate that the refrigeration unit is in the stable running stage.

[0118] Step S580, control the inlet of the bypass refrigerant pipeline to disconnect the annular refrigerant pipeline and control the first evaporator and the second evaporator in series state to be connected to the annular refrigerant pipeline.

[0119] Specifically, as Figure 6The diagram shown is a structural diagram of an evaporator assembly in series according to an embodiment of this application. The controller can connect the first outlet 81A and the second outlet 81B of the first solenoid valve 81, and disconnect the third outlet 81C; connect the first outlet 84A and the third outlet 84C of the fourth solenoid valve 84, and disconnect the second outlet 84B; connect the first outlet 85A, the second outlet 85B, and the third outlet 85C of the fifth solenoid valve 85; and connect the first outlet 83A and the third outlet 83C of the third solenoid valve 83, while switching the second outlet 83B. To ensure the normal operation of the refrigeration unit, the return pipe of the second evaporator 5 needs to remain connected, but it can still be considered that the first evaporator 4 and the second evaporator 5 are in series. In this way, a loop connecting the first evaporator 4 and the second evaporator 5 in series can be formed. The refrigerant output from compressor 1 will flow through the first outlet 81A and the second outlet 81B of the first solenoid valve 81, condenser 3, the first outlet 84A and the third outlet 84C of the fourth solenoid valve 84, the second evaporator 5, the second outlet 85B and the third outlet 85C of the fifth solenoid valve 85, the first outlet 83A and the third outlet 83C of the third solenoid valve 83, the first evaporator 4, and return to compressor 1.

[0120] Step S590: Control the inlet of the bypass refrigerant pipe to connect to the annular refrigerant pipe and control the annular refrigerant pipe to connect to the first evaporator and the second evaporator in parallel.

[0121] Specifically, such as Figure 7 The diagram shown is a structural diagram of an evaporator group in parallel configuration according to an embodiment of this application. The controller can connect the first outlet 81A and the second outlet 81B of the first solenoid valve 81, and disconnect the third outlet 81C; it can connect the first outlet 84A, the second outlet 83B, and the third outlet 84C of the fourth solenoid valve 84; it can connect the first outlet 85A and the second outlet 85B of the fifth solenoid valve 85, and disconnect the third outlet 85C; it can disconnect the first outlet 83A, the second outlet 83B, and the third outlet 83C of the third solenoid valve 83. In this way, a parallel circuit of the first evaporator 4 and the second evaporator 5 can be formed. The refrigerant output from compressor 1 flows through the first outlet 81A and the second outlet 81B of the first solenoid valve 81, through condenser 3, and reaches the first outlet 84A of the fourth solenoid valve 84, where it is split into the second outlet 84B and the third outlet 84C respectively. One branch flows through the second evaporator 5, and through the second outlet 85B and the first outlet 85A of the fifth solenoid valve 85, it flows back to the annular refrigerant pipeline from the return pipe of the second evaporator 5. The other branch flows to the first evaporator 4, and through the return pipe of the first evaporator 4, it flows back to the annular refrigerant pipeline. The refrigerant flowing into the annular refrigerant pipeline finally returns to compressor 1.

[0122] like Figure 8Fig. 8 is a control flow chart of switching the demand mode to the defrosting mode of the refrigerating unit according to an embodiment of the present application.

[0123] Step S810, the refrigerating unit starts running.

[0124] Step S820, real-time monitoring of the unit data of the refrigerating unit; wherein the unit data comprises: the frost thickness H1 and the refrigerating time t1 of the first evaporator, the frost thickness H2 and the refrigerating time t2 of the second evaporator.

[0125] Step S830, comparing the frost thickness H1 of the first evaporator with the thickness threshold value Hd1 of the first evaporator and comparing the frost thickness H2 of the second evaporator with the thickness threshold value Hd2 of the second evaporator.

[0126] Step S840, determining whether H1 > Hd1 and / or H2 > Hd2 occurs; if yes, executing step S850; if no, continuing to execute step S820.

[0127] Step S850, determining that the refrigerating unit switches to the defrosting mode, and determining the evaporator to be defrosted and the evaporator to be refrigerated among the two evaporators.

[0128] In the case that the frost thickness of one of the evaporators is greater than the thickness threshold value thereof, among the two evaporators, the evaporator with the frost thickness greater than the thickness threshold value thereof is determined as the evaporator to be defrosted, and the other evaporator is determined as the evaporator to be refrigerated.

[0129] In the case that the frost thickness of both of the evaporators is greater than the thickness threshold value thereof, in the unit data, the refrigerating time of each evaporator is read; in the case that the refrigerating time of the first evaporator 4 is greater than the preset refrigerating time threshold value, the first evaporator 4 is determined as the evaporator to be defrosted and the second evaporator 5 is determined as the evaporator to be refrigerated; in the case that the refrigerating time of the second evaporator 5 is greater than the preset refrigerating time threshold value, the first evaporator 4 is determined as the evaporator to be refrigerated and the second evaporator 5 is determined as the evaporator to be defrosted.

[0130] Step S860, controlling the inlet of the bypass refrigerant pipeline to communicate with the annular refrigerant pipeline; controlling the outlet of the bypass refrigerant pipeline to communicate with the evaporator to be defrosted and to disconnect the evaporator to be refrigerated; controlling the annular refrigerant pipeline to disconnect the evaporator to be defrosted and to communicate with the evaporator to be refrigerated.

[0131] In the case that the first evaporator 4 is the evaporator to be defrosted and the second evaporator 5 is the evaporator to be refrigerated, the bypass refrigerant pipeline is used to introduce high-temperature refrigerant to the first evaporator 4, and the second evaporator 5 normally refrigerates.

[0132] Specifically, such as Figure 9 The diagram shown is a structural diagram of a refrigeration unit during defrosting of the first evaporator 4 according to an embodiment of this application. The controller can control the first outlet 81A, second outlet 81B, and third outlet 81C of the first solenoid valve 81 to be connected; control the first outlet 82A and third outlet 82C of the second solenoid valve 82 to be connected, and the second outlet 82B to be cut off; control the second outlet 83B and third outlet 83C of the third solenoid valve 83 to be connected, and the first outlet 83A to be switched; control the first outlet 84A and third outlet 84C of the fourth solenoid valve 84 to be connected, and the second outlet 84B to be cut off; control the first outlet 85A and second outlet 85B of the fifth solenoid valve 85 to be connected, and the third outlet 85C to be cut off. In this way, high-temperature refrigerant can be introduced into the first evaporator 4, while the second evaporator 5 performs normal cooling. That is, the refrigerant output from the compressor 1 will flow through the first outlet 81A of the first solenoid valve 81, and be split into the second outlet 81B and the third outlet 81C. One branch flows through the condenser 3, the first outlet 84A and the third outlet 84C of the fourth solenoid valve 84, the second evaporator 5, and then returns to the annular refrigerant pipeline from the return pipe of the second evaporator 5 through the second outlet 85B and the first outlet 85A of the fifth solenoid valve 85. The other branch flows through the first outlet 82A and the second outlet 82C of the second solenoid valve 82, the second outlet 83B and the third outlet 83C of the third solenoid valve 83, reaches the first evaporator 4, and returns to the annular refrigerant pipeline through the return pipe of the first evaporator 4. The refrigerant flowing into the annular refrigerant pipeline finally returns to the compressor 1.

[0133] When the first evaporator 4 is the evaporator to be cooled and the second evaporator 5 is the evaporator to be defrosted, high-temperature refrigerant is introduced into the second evaporator 5 through a bypass refrigerant pipe, and the first evaporator 4 cools normally.

[0134] Specifically, such as Figure 10As shown, it is a refrigeration unit structure diagram when defrosting the second evaporator 5 according to an embodiment of the present application. The controller can control the first outlet 81A, the second outlet 81B and the third outlet 81C of the first electromagnetic valve 81 to be communicated; control the first outlet 82A and the second outlet 82B of the second electromagnetic valve 82 to be communicated, and the third outlet 82C to be cut off; control the first outlet 83A, the second outlet 83B and the third outlet 83C of the third electromagnetic valve 83 to be cut off; control the first outlet 84A and the second outlet 84B of the fourth electromagnetic valve 84 to be communicated, and the third outlet 84C to be cut off; control the first outlet 85A and the second outlet 85B of the fifth electromagnetic valve 85 to be communicated, and the third outlet 85C to be cut off. In this way, the high-temperature refrigerant can be introduced into the second evaporator 5, and the first evaporator 4 can normally refrigerate, that is, the refrigerant output by the compressor 1 is divided into two branches through the first outlet 81A of the first electromagnetic valve 81, one branch flows through the condenser 3, the first outlet 84A and the second outlet 84B of the fourth electromagnetic valve 84, reaches the first evaporator 4, and flows back to the annular refrigerant pipeline through the gas return pipe of the first evaporator 4; the other branch flows through the first outlet 82A and the second outlet 82B of the second electromagnetic valve 82, reaches the second evaporator 5, and flows back to the annular refrigerant pipeline through the second outlet 85B and the first outlet 85A of the fifth electromagnetic valve 85 from the gas return pipe of the second evaporator 5; the refrigerant in the annular refrigerant pipeline is finally returned to the compressor 1.

[0135] In step S870, the exhaust temperature T3 of the compressor is monitored to determine whether the exhaust temperature T3 of the compressor is greater than the exhaust temperature threshold Te; if yes, step S880 is performed; if no, step S860 is jumped to.

[0136] In step S880, the heating wire wound on the first bypass pipeline is controlled to start heating.

[0137] Further, a temperature sensor can be arranged at the outlet (exhaust port) of the compressor 1; the exhaust temperature of the compressor 1 is detected by using the temperature sensor.

[0138] In the embodiment of the present application, during the defrosting of any evaporator, the frost thickness corresponding to the evaporator being defrosted is monitored; when the frost thickness corresponding to the evaporator being defrosted is less than a preset stop defrosting thickness, the defrosting of the evaporator being defrosted is stopped.

[0139] The stop defrosting thickness is used to measure whether the defrosting can be stopped. The stop defrosting thickness can be an empirical value or a value obtained through experiments.

[0140] Further, before defrosting the evaporator being defrosted, if only the frost thickness of the evaporator being defrosted is greater than the corresponding thickness threshold, the demand mode of the refrigeration unit is switched to the refrigeration mode; if the frost thickness of both evaporators is greater than the corresponding thickness threshold, the refrigeration unit remains in the defrosting mode, the evaporator being defrosted is determined as the evaporator to be refrigerated, and the other evaporator is determined as the evaporator to be defrosted, and defrosting of the other evaporator is started.

[0141] The embodiment of the present application provides the possibility of guiding high-temperature refrigerant to the evaporator by arranging the bypass refrigerant pipeline between the compressor 1 and the condenser 3, and in the defrosting process, the compressor 1 does not need to be stopped, one evaporator is defrosted, and the other evaporator is refrigerated, thereby avoiding the problem that refrigerant stays in the evaporator to evaporate and absorb heat after the compressor 1 is stopped, and the defrosting efficiency is improved, and in the defrosting process, the refrigeration capacity is continuously provided, and large temperature fluctuations in the inter-room are avoided.

[0142] Further, compared with the conventional scheme, the embodiment of the present application introduces the low-cost and low-occupancy heating wire 13 as the secondary heater to better realize defrosting, make up for the problem of insufficient exhaust heat of the compressor 1, improve the performance coefficient of the refrigeration unit, and better solve the problem of evaporator frosting.

[0143] Further, the embodiment of the present application adopts the double evaporator and double refrigeration path, can keep refrigeration while defrosting, can reduce the temperature change of the inter-room, and reduce energy waste.

[0144] The embodiment of the present application also provides a control device of a refrigeration unit. Figure 11 As shown in the figure, it is a structural diagram of the control device of the refrigeration unit according to the embodiment of the present application.

[0145] The control device of the refrigeration unit comprises:

[0146] The data determination module 1110 is configured to determine the corresponding demand mode of the refrigeration unit by monitoring the unit data of the refrigeration unit, wherein the demand mode comprises a defrosting mode and a refrigeration mode.

[0147] The first control module 1120 is configured to, when it is determined that the refrigeration unit corresponds to the refrigeration mode, control the inlet of the bypass refrigerant pipeline to disconnect the annular refrigerant pipeline and control the annular refrigerant pipeline to communicate with the two evaporators.

[0148] The second control module 1130 is configured to, when it is determined that the refrigeration unit corresponds to the defrosting mode, control the inlet of the bypass refrigerant pipeline to be connected to the annular refrigerant pipeline; control the outlet of the bypass refrigerant pipeline to be connected to the evaporator to be defrosted and disconnected from the evaporator to be refrigerated; and control the annular refrigerant pipeline to be disconnected from the evaporator to be defrosted and connected to the evaporator to be refrigerated.

[0149] The functions of the device described in the embodiments of the present application have been described in the foregoing method embodiments, and therefore, details that are not described in the description of the present embodiments can be referred to the foregoing embodiments, which will not be repeated here.

[0150] The embodiments of the present application also provide a control device of a refrigeration unit, as shown in Figure 12 The control device of the refrigeration unit according to an embodiment of the present application is shown in the structural diagram of the control device of the refrigeration unit.

[0151] The control device of the refrigeration unit includes a processor 1210, a communication interface 1220, a memory 1230 and a communication bus 1240. The processor 1210, the communication interface 1220 and the memory 1230 complete mutual communication through the communication bus 1240.

[0152] The memory 1130 is configured to store a computer program.

[0153] In an embodiment of the present application, the processor 1110 is configured to execute the program stored in the memory 1130 to implement the control method of the refrigeration unit provided by any one of the foregoing method embodiments, including: determining a demand mode corresponding to the refrigeration unit by monitoring unit data of the refrigeration unit; wherein the demand mode includes a defrosting mode and a refrigerating mode; when it is determined that the refrigeration unit corresponds to the refrigerating mode, controlling the inlet of the bypass refrigerant pipeline to be disconnected from the annular refrigerant pipeline and controlling the annular refrigerant pipeline to be connected to the two evaporators; when it is determined that the refrigeration unit corresponds to the defrosting mode, controlling the inlet of the bypass refrigerant pipeline to be connected to the annular refrigerant pipeline; controlling the outlet of the bypass refrigerant pipeline to be connected to the evaporator to be defrosted and disconnected from the evaporator to be refrigerated; and controlling the annular refrigerant pipeline to be disconnected from the evaporator to be defrosted and connected to the evaporator to be refrigerated.

[0154] The determination of the demand mode corresponding to the refrigeration unit by monitoring the unit data of the refrigeration unit includes: reading the room temperature and the frost thickness corresponding to each evaporator in the unit data; determining that the refrigeration unit corresponds to the refrigerating mode when it is determined that the room temperature corresponding to at least one of the evaporators is greater than the preset temperature corresponding to the evaporator; and determining that the refrigeration unit corresponds to the defrosting mode when it is determined that the frost thickness corresponding to at least one of the evaporators is greater than the thickness threshold value corresponding to the evaporator.

[0155] In the method, the control of the inlet of the bypass refrigerant pipeline to be connected to the annular refrigerant pipeline and the control of the annular refrigerant pipeline to be connected to the two evaporators include: reading the running time of the compressor in the unit data; in the case that the running time of the compressor is less than a pre-set running time threshold, controlling the first electromagnetic valve to be connected to the annular refrigerant pipeline and to be connected to the first end of the first bypass pipeline; controlling the fourth electromagnetic valve to be connected to the first end of the first refrigerant pipeline and the first end of the second refrigerant pipeline and to be blocked to the first end of the third refrigerant pipeline; controlling the fifth electromagnetic valve to be connected to the outlet of the second evaporator and the second end of the fourth refrigerant pipeline; controlling the third electromagnetic valve to be connected to the first end of the fourth refrigerant pipeline and the inlet of the first evaporator and to be blocked to the second end of the second bypass pipeline; in the case that the running time of the compressor is greater than or equal to the running time threshold, controlling the first electromagnetic valve to be connected to the annular refrigerant pipeline and to be blocked to the first end of the first bypass pipeline; controlling the fourth electromagnetic valve to be connected to the first end of the first refrigerant pipeline, the first end of the second refrigerant pipeline and the first end of the third refrigerant pipeline; controlling the fifth electromagnetic valve to be connected to the outlet of the second evaporator and the annular refrigerant pipeline and to be blocked to the second end of the fourth refrigerant pipeline; and controlling the third electromagnetic valve to be blocked to the first end of the fourth refrigerant pipeline and to be blocked to the second end of the second bypass pipeline.

[0156] In the method, the control of the inlet of the bypass refrigerant pipeline to be connected to the annular refrigerant pipeline and the control of the annular refrigerant pipeline to be connected to the two evaporators include: reading the running time of the compressor in the unit data; in the case that the running time of the compressor is less than a pre-set running time threshold, controlling the first electromagnetic valve to be connected to the annular refrigerant pipeline and to be connected to the first end of the first bypass pipeline; controlling the fourth electromagnetic valve to be connected to the first end of the first refrigerant pipeline and the first end of the second refrigerant pipeline and to be blocked to the first end of the third refrigerant pipeline; controlling the fifth electromagnetic valve to be connected to the outlet of the second evaporator and the second end of the fourth refrigerant pipeline; controlling the third electromagnetic valve to be connected to the first end of the fourth refrigerant pipeline and the inlet of the first evaporator and to be blocked to the second end of the second bypass pipeline; in the case that the running time of the compressor is greater than or equal to the running time threshold, controlling the first electromagnetic valve to be connected to the annular refrigerant pipeline and to be blocked to the first end of the first bypass pipeline; controlling the fourth electromagnetic valve to be connected to the first end of the first refrigerant pipeline, the first end of the second refrigerant pipeline and the first end of the third refrigerant pipeline; controlling the fifth electromagnetic valve to be connected to the outlet of the second evaporator and the annular refrigerant pipeline and to be blocked to the second end of the fourth refrigerant pipeline; and controlling the third electromagnetic valve to be blocked to the first end of the fourth refrigerant pipeline and to be blocked to the second end of the second bypass pipeline.

[0157] In the control of the bypass refrigerant pipe outlet to communicate with the evaporator to be defrosted, the method further comprises: in the case that the frost thickness of one of the evaporators is greater than the corresponding thickness threshold, determining the one of the evaporators as the evaporator to be defrosted and the other evaporator as the evaporator to be refrigerated; in the case that the frost thickness of both of the evaporators is greater than the corresponding thickness threshold, reading the refrigeration time of each evaporator in the unit data; in the case that the refrigeration time of the first evaporator is greater than the preset refrigeration time threshold, determining the first evaporator as the evaporator to be defrosted and the second evaporator as the evaporator to be refrigerated; in the case that the refrigeration time of the second evaporator is greater than the preset refrigeration time threshold, determining the first evaporator as the evaporator to be refrigerated and the second evaporator as the evaporator to be defrosted.

[0158] In the control of the bypass refrigerant pipe outlet to communicate with the evaporator to be defrosted, the method further comprises: in the case that the frost thickness of one of the evaporators is greater than the corresponding thickness threshold, determining the one of the evaporators as the evaporator to be defrosted and the other evaporator as the evaporator to be refrigerated; in the case that the frost thickness of both of the evaporators is greater than the corresponding thickness threshold, reading the refrigeration time of each evaporator in the unit data; in the case that the refrigeration time of the first evaporator is greater than the preset refrigeration time threshold, determining the first evaporator as the evaporator to be defrosted and the second evaporator as the evaporator to be refrigerated; in the case that the refrigeration time of the second evaporator is greater than the preset refrigeration time threshold, determining the first evaporator as the evaporator to be refrigerated and the second evaporator as the evaporator to be defrosted.

[0159] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the control method of the refrigeration unit provided in any one of the preceding method embodiments. Since the control method of the refrigeration unit has been described in detail above, the description of the present embodiment is not detailed, and the related description in the preceding embodiments can be referred to, which is not repeated here.

[0160] The device embodiments described above are only schematic, wherein the units shown as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place or distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment scheme.

[0161] Those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, and of course can be implemented by hardware. Based on such an understanding, the technical solutions described above essentially or in other words make contributions to the related art, and can be embodied in a software product form, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, or an optical disk, and includes a plurality of instructions to cause a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0162] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their occurrence in the particular order

[0163] The above description is merely that of specific embodiments of the present application, and thus is not intended to limit the present application. Based on the general principles described herein, various modifications to the embodiments can be implemented by those skilled in the art. The present application is not limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A refrigeration unit, characterized in that, include: Circular refrigerant piping, bypass refrigerant piping, compressor, condenser, evaporator assembly, and controller; The annular refrigerant pipeline is sequentially connected to the compressor, the condenser, and the evaporator assembly, and returns to the compressor; The evaporator assembly includes: a first evaporator and a second evaporator connected together; The inlet of the bypass refrigerant pipe is connected to the annular refrigerant pipe between the compressor and the condenser, and the outlet is connected to the first evaporator and the second evaporator; The controller is used to control the on / off status of each connection point of the annular refrigerant pipe and the bypass refrigerant pipe.

2. The refrigeration unit according to claim 1, characterized in that, The refrigeration unit also includes: a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, and a fifth solenoid valve; The bypass refrigerant pipeline includes: a first bypass pipeline and a second bypass pipeline; The annular refrigerant pipeline includes: a first refrigerant pipeline, a second refrigerant pipeline, a third refrigerant pipeline, and a fourth refrigerant pipeline; The first end of the first bypass pipe is connected to the annular refrigerant pipe between the compressor and the condenser via the first solenoid valve; the second end of the first bypass pipe is connected to the second refrigerant pipe and the first end of the second bypass pipe via the second solenoid valve; the second end of the second bypass pipe is connected to the inlet of the second evaporator via the third solenoid valve. The first end of the first refrigerant pipe, the second refrigerant pipe, and the third refrigerant pipe is connected via the fourth solenoid valve; the second end of the first refrigerant pipe is connected to one end of the condenser; the second end of the second refrigerant pipe is connected to the inlet of the second evaporator; and the second end of the third refrigerant pipe is connected to the inlet of the first evaporator. The first end of the fourth refrigerant pipe is connected to the third refrigerant pipe, and the second end is connected to the outlet of the second evaporator and the return pipe of the second evaporator respectively through the fifth solenoid valve. The first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve, under the control of the controller, adjust the on / off state of each port.

3. The refrigeration unit according to any one of claims 1-2, characterized in that, The refrigeration unit further includes: a heating wire wound on the first bypass pipe; the heating wire adjusts its heating state under the control of the controller.

4. A control method for a refrigeration unit, characterized in that, The controller used in any one of claims 1-3 comprises: By monitoring the unit data of the refrigeration unit, the corresponding demand mode of the refrigeration unit is determined; wherein, the demand mode includes: defrosting mode and cooling mode; When determining the corresponding refrigeration mode of the refrigeration unit, the inlet of the bypass refrigerant pipe is disconnected from the annular refrigerant pipe and the annular refrigerant pipe is connected to the two evaporators. When the defrosting mode corresponding to the refrigeration unit is determined, the inlet of the bypass refrigerant pipe is controlled to connect to the annular refrigerant pipe; the outlet of the bypass refrigerant pipe is controlled to connect to the evaporator to be defrosted, and the evaporator to be cooled is disconnected; the annular refrigerant pipe is controlled to disconnect the evaporator to be defrosted and connect to the evaporator to be cooled.

5. The method according to claim 4, characterized in that, The step of determining the demand pattern corresponding to the refrigeration unit by monitoring the unit data includes: The unit data includes the compartment temperature and frost thickness for each evaporator. If it is determined that the temperature of at least one of the compartments corresponding to the evaporator is greater than the preset temperature corresponding to the evaporator, the corresponding cooling mode of the refrigeration unit is determined. If it is determined that the frost layer thickness corresponding to at least one of the evaporators is greater than the thickness threshold corresponding to the evaporator, the defrosting mode corresponding to the refrigeration unit is determined.

6. The method according to claim 4, characterized in that, The control of disconnecting the inlet of the bypass refrigerant pipe from the annular refrigerant pipe and controlling the annular refrigerant pipe to connect the two evaporators includes: The compressor's operating time is read from the unit data; If the compressor's operating time is determined to be less than a preset operating time threshold, the system controls the first solenoid valve to connect the annular refrigerant pipe and block the first end of the first bypass pipe; controls the fourth solenoid valve to connect the first end of the first refrigerant pipe and the first end of the second refrigerant pipe and block the first end of the third refrigerant pipe; controls the fifth solenoid valve to connect the outlet of the second evaporator and the second end of the fourth refrigerant pipe; controls the third solenoid valve to connect the first end of the fourth refrigerant pipe and the inlet of the first evaporator and block the second end of the second bypass pipe. When the operating time of the compressor is determined to be greater than or equal to the operating time threshold, the first solenoid valve is controlled to connect the annular refrigerant pipe and block the first end of the first bypass pipe; the fourth solenoid valve is controlled to connect the first end of the first refrigerant pipe, the first end of the second refrigerant pipe, and the first end of the third refrigerant pipe; the fifth solenoid valve is controlled to connect the second evaporator outlet and the annular refrigerant pipe and block the second end of the fourth refrigerant pipe; the third solenoid valve is controlled to block the first end of the fourth refrigerant pipe and the second end of the second bypass pipe.

7. The method according to claim 4, characterized in that, The system controls the inlet of the bypass refrigerant pipe to connect to the annular refrigerant pipe; and controls the outlet of the bypass refrigerant pipe to connect to the evaporator to be defrosted, and disconnects the evaporator to be cooled. Controlling the annular refrigerant pipe to disconnect the evaporator to be defrosted and to connect the evaporator to be cooled includes: When the first evaporator is a defrosting evaporator and the second evaporator is a cooling evaporator, the first solenoid valve is controlled to connect the annular refrigerant pipe and the first end of the first bypass pipe; the second solenoid valve is controlled to connect the second end of the first bypass pipe and the first end of the second bypass pipe, blocking the connection with the inlet of the second evaporator; the third solenoid valve is controlled to connect the second end of the second bypass pipe and the inlet of the first evaporator, blocking the first end of the fourth refrigerant pipe; and the fourth solenoid valve is controlled to connect the first end of the first refrigerant pipe and the first end of the second refrigerant pipe, blocking the first end of the third refrigerant pipe. When the first evaporator is an evaporator to be cooled and the second evaporator is an evaporator to be defrosted, the first solenoid valve is controlled to connect to the annular refrigerant pipe and to the first end of the first bypass pipe; the second solenoid valve is controlled to connect to the inlet of the second evaporator and disconnect the first end of the second bypass pipe; the fourth solenoid valve is controlled to connect to the first end of the first refrigerant pipe and the first end of the third refrigerant pipe and block the first end of the second refrigerant pipe; and the fifth solenoid valve is controlled to connect to the outlet of the second evaporator and the port of the annular refrigerant pipe and block the second port of the fourth refrigerant pipe.

8. The method according to claim 4, characterized in that, The bypass refrigerant pipe is connected to the annular refrigerant pipe at its inlet; the bypass refrigerant pipe is connected to the evaporator to be defrosted at its outlet, and disconnected from the evaporator to be cooled. Before controlling the annular refrigerant pipe to disconnect the evaporator to be defrosted and connect the evaporator to be cooled, the procedure further includes: If the frost thickness of one of the evaporators is greater than its corresponding thickness threshold, then between the two evaporators, one of the evaporators is identified as the evaporator to be defrosted and the other evaporator is identified as the evaporator to be cooled. If the frost thickness of both evaporators is greater than their respective thickness thresholds, the cooling time of each evaporator is read from the unit data; if the cooling time of the first evaporator is greater than the preset cooling time threshold, the first evaporator is determined to be the evaporator to be defrosted and the second evaporator is determined to be the evaporator to be cooled. If the cooling time of the second evaporator exceeds a preset cooling time threshold, the first evaporator is determined to be the evaporator to be cooled and the second evaporator is determined to be the evaporator to be defrosted.

9. The method according to any one of claims 7-8, characterized in that, After the outlet of the bypass refrigerant pipe is connected to the evaporator to be defrosted, the system further includes: If the compressor's exhaust temperature is detected to be lower than a preset exhaust temperature threshold, the heating wire wound on the first bypass pipe is controlled to start heating.

10. A control device for a refrigeration unit, characterized in that, The controller provided in any one of claims 1-3 comprises: The data determination module is used to determine the demand mode corresponding to the refrigeration unit by monitoring the unit data of the refrigeration unit; wherein, the demand mode includes: defrosting mode and cooling mode; The first control module is used to control the inlet of the bypass refrigerant pipe to disconnect the annular refrigerant pipe and control the annular refrigerant pipe to connect the two evaporators when the corresponding refrigeration mode of the refrigeration unit is determined. The second control module is used to, when determining the defrosting mode corresponding to the refrigeration unit, control the inlet of the bypass refrigerant pipe to connect to the annular refrigerant pipe; control the outlet of the bypass refrigerant pipe to connect to the evaporator to be defrosted and disconnect the evaporator to be cooled; and control the annular refrigerant pipe to disconnect the evaporator to be defrosted and connect to the evaporator to be cooled.

11. A control device for a refrigeration unit, characterized in that, include: At least one communication interface; At least one bus connected to the at least one communication interface; At least one processor connected to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to execute a control program for a refrigeration unit stored in the memory to implement the control method for the refrigeration unit according to any one of claims 4-9.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which are executed to implement the control method for the refrigeration unit according to any one of claims 4-9.

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