A vehicle-mounted refrigerator and its control method

Abstract

The present invention provides a vehicle-mounted refrigerator and a control method therefor. The vehicle-mounted refrigerator includes: a compressor, a refrigeration heat exchanger, a refrigeration box, and a first heat exchanger. The compressor, the refrigeration heat exchanger, and the first heat exchanger are connected to form at least part of the structure in a refrigeration cycle loop. The refrigeration heat exchanger is disposed inside the refrigeration box to be able to refrigerate the air flow inside the refrigeration box. The vehicle-mounted refrigerator further includes a first blower, which is also disposed inside the refrigeration box, and the first blower is disposed opposite to the refrigeration heat exchanger to be able to drive or enhance the heat exchange between the air flow in the refrigeration box and the refrigeration heat exchanger. According to the present invention, the heat exchange in the refrigeration box can be made more uniform, ensuring that the food has a consistent temperature, reducing or eliminating the phenomenon of ice formation in the freezer box, and effectively solving the problem of easy ice formation in traditional portable refrigerators.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a vehicle-mounted refrigerator and a control method thereof. Background Art

[0002] Compared with household refrigerators, portable refrigerators have the advantages of small floor space, easy to carry, and low energy consumption. As a product with a strong sense of experience in the self-driving travel scenario, it can greatly improve the quality of self-driving tours, so it is favored by people of all ages. However, due to the reasons of emerging products, portable refrigerators on the market generally have problems such as poor refrigeration effect, easy water accumulation, large noise, and easy shaking when opening and closing the door. Therefore, there is a need for a portable refrigerator with good refrigeration effect, low noise, and good stability in the market. Patent CN 212778120U discloses a new type of vertical small refrigerator, which uses a blower to deliver the cold quantity of the refrigeration device to the storage space and stir the air in the storage space to make the temperature inside it balanced, achieving the effect of effectively refrigerating items. It can not only greatly improve the refrigeration effect but also solve the problem of easy water accumulation in direct-cool refrigerators. However, the refrigerator in this patent is a vertical refrigerator, and it is difficult to ensure its stability during vehicle driving. Moreover, this refrigerator only has a single cooling mode, mainly targeting college students, ignoring the use scenarios such as self-driving tours and long-distance truck transportation, and the market is relatively limited. Due to technical problems such as easy icing in existing vehicle-mounted refrigerators, inability to achieve heat preservation during refrigeration, and the heat of the compressor affecting the freezer, resulting in low refrigeration efficiency, the present invention researches and designs a vehicle-mounted refrigerator and a control method thereof. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of easy icing in the vehicle-mounted refrigerator in the prior art, so as to provide a vehicle-mounted refrigerator and a control method thereof.

[0004] To solve the above problems, the present invention provides a vehicle-mounted refrigerator, which includes:

[0005] A compressor, a refrigeration heat exchanger, a refrigeration box, and a first heat exchanger. The compressor, the refrigeration heat exchanger, and the first heat exchanger are connected to form at least part of the structure in the refrigeration cycle loop. The refrigeration heat exchanger is arranged inside the refrigeration box to be able to refrigerate the air flow inside the refrigeration box. The vehicle-mounted refrigerator further includes a first blower, which is also arranged inside the refrigeration box, and the first blower is arranged opposite to the refrigeration heat exchanger to be able to drive or enhance the heat exchange between the air flow in the refrigeration box and the refrigeration heat exchanger.

[0006] In some embodiments, it further includes a second heat exchanger and a heat preservation box. The second heat exchanger is disposed inside the heat preservation box to heat and / or keep warm the air flow inside the heat preservation box, and the second heat exchanger is also connected to the refrigeration cycle loop.

[0007] In some embodiments, a heat preservation box cover is provided at the upper end of the heat preservation box. The heat preservation box cover can be rotated to open the heat preservation box, forming a flip - type structure; a refrigeration box cover is provided at the upper end of the refrigeration box. The refrigeration box cover can be rotated to open the refrigeration box, forming a flip - type structure.

[0008] In some embodiments, it further includes a compressor box. The compressor is disposed inside the compressor box, and the first heat exchanger is disposed on the compressor box to exchange heat between the refrigerant and the outside of the vehicle.

[0009] In some embodiments, the compressor box and the heat preservation box are stacked vertically, with the heat preservation box located at the upper end of the compressor box; the compressor box and the heat preservation box form an integral structure; the heat preservation box and the refrigeration box are arranged adjacent to or spaced apart from each other in the horizontal direction.

[0010] In some embodiments, a first heat insulation member is provided between the compressor box and the refrigeration box; a second heat insulation member is provided between the heat preservation box and the refrigeration box; a partition member is provided between the compressor box and the heat preservation box, and the partition member is a heat - conducting structure.

[0011] In some embodiments, it further includes a second fan and a third fan. The second fan is disposed inside, on the wall surface, or outside the compressor box, and the second fan is disposed opposite to the first heat exchanger to drive or enhance the heat exchange between the outside air flow of the vehicle and the first heat exchanger; the third fan is disposed inside the heat preservation box, and the third fan is disposed opposite to the second heat exchanger to drive or enhance the heat exchange between the air flow inside the heat preservation box and the second heat exchanger.

[0012] In some embodiments, it further includes a first control valve, a first parallel branch, and a second control valve. One end of the second heat exchanger can be communicated with the exhaust end of the compressor, and the other end can be communicated with one end of the first heat exchanger. The first control valve is disposed between the second heat exchanger and the compressor, or at a position between the second heat exchanger and the first heat exchanger; the first parallel branch is connected in parallel at both ends after the second heat exchanger and the first control valve are connected in series, and the second control valve is disposed on the first parallel branch.

[0013] In some embodiments, a throttling device and a temperature acquisition device are further included. The throttling device is arranged between the first heat exchanger and the refrigeration heat exchanger, and the temperature acquisition device is arranged on the refrigerant pipeline between the first heat exchanger and the throttling device.

[0014] In some embodiments, a third control valve, a fourth control valve and a second parallel branch are further included. One end of the refrigeration heat exchanger can communicate with the suction end of the compressor, and the other end can communicate with the throttling device. The fourth control valve is arranged at a position between the refrigeration heat exchanger and the compressor or between the refrigeration heat exchanger and the throttling device; the second parallel branch is arranged in parallel at both ends after the refrigeration heat exchanger and the fourth control valve are connected in series, and the third control valve is arranged on the second parallel branch.

[0015] The present invention also provides a control method for an in-vehicle refrigerator as described above, which includes:

[0016] A detection step of detecting the mode of the in-vehicle refrigerator and detecting the temperature of the refrigerant collected by the temperature acquisition device;

[0017] A judgment step of judging whether the mode of the in-vehicle refrigerator is a refrigeration mode or a heat preservation mode, and judging the relationship between the temperature T collected by the temperature acquisition device and a first preset temperature value T1 or a second preset temperature value T2;

[0018] A control step of, when the mode of the in-vehicle refrigerator is the refrigeration mode and the temperature T collected by the temperature acquisition device is less than or equal to the first preset temperature value T1, controlling the first heat exchanger to heat, the second heat exchanger not to heat, and the refrigeration heat exchanger to refrigerate; when the mode of the in-vehicle refrigerator is the refrigeration mode and the temperature T collected by the temperature acquisition device is greater than the first preset temperature value T1, controlling both the first heat exchanger and the second heat exchanger to operate in heating, and the refrigeration heat exchanger to refrigerate;

[0019] When the mode of the in-vehicle refrigerator is the heat preservation mode and the temperature T collected by the temperature acquisition device is less than or equal to the second preset temperature value T2, controlling both the first heat exchanger and the second heat exchanger to operate in heating, the refrigeration heat exchanger to refrigerate, and at the same time controlling the second blower to close or decelerate; when the mode of the in-vehicle refrigerator is the heat preservation mode and the temperature T collected by the temperature acquisition device is greater than the second preset temperature value T2, controlling both the first heat exchanger and the second heat exchanger to operate in heating, the refrigeration heat exchanger to refrigerate, and at the same time controlling the second blower to turn on or accelerate.

[0020] In some embodiments, when the first control valve, the second control valve, the third control valve and the fourth control valve are included at the same time:

[0021] In the control step, when the mode of the vehicle-mounted refrigerator is the refrigeration mode and T≤T1, control the first control valve to disconnect, the second control valve to connect, the third control valve to disconnect, and the fourth control valve to connect; when the mode of the vehicle-mounted refrigerator is the refrigeration mode and T>T1, control the first control valve to connect, the second control valve to disconnect, the third control valve to disconnect, and the fourth control valve to connect;

[0022] When the mode of the vehicle-mounted refrigerator is the heat preservation mode and T≤T2, control the first control valve to connect, the second control valve to disconnect, the third control valve to disconnect, and the fourth control valve to connect, and at the same time control the second blower to turn off or slow down; when the mode of the vehicle-mounted refrigerator is the heat preservation mode and T>T2, control the first control valve to connect, the second control valve to disconnect, the third control valve to disconnect, and the fourth control valve to connect, and at the same time control the second blower to turn on or accelerate.

[0023] In some embodiments, in the control step, when the mode of the vehicle-mounted refrigerator is the refrigeration mode, if the temperature in the refrigeration box is lower than the third preset temperature T3 and the vehicle-mounted refrigerator needs to be slowly shut down, control the compressor to shut down, the third control valve to connect, and the fourth control valve to disconnect.

[0024] In some embodiments, when the temperature T collected by the temperature acquisition device within the first preset time t1 is all ≤T1, it is determined that T≤T1; when the temperature T collected by the temperature acquisition device within the first preset time t1 is all >T1, it is determined that T>T1; when the temperature T collected by the temperature acquisition device within the second preset time t2 is all ≤T2, it is determined that T≤T2; when the temperature T collected by the temperature acquisition device within the second preset time t2 is all >T2, it is determined that T>T2.

[0025] In some embodiments, t1 = 1min, and the temperature acquisition device collects a set of temperature data every 10s within 1min; t2 = 1min, and the temperature acquisition device collects a set of temperature data every 10s within 1min; T1 = T2 = 50℃ - 60℃.

[0026] A vehicle-mounted refrigerator and its control method provided by the present invention have the following beneficial effects:

[0027] 1. The present invention can effectively cool the air flow in the refrigeration chamber of the vehicle-mounted refrigerator through the refrigeration heat exchanger provided in the refrigeration chamber of the vehicle-mounted refrigerator. And through the structure of additionally arranging a first blower inside the refrigeration chamber of the vehicle-mounted refrigerator, it can drive or enhance the heat exchange between the air flow in the refrigeration chamber and the refrigeration heat exchanger. When the vehicle-mounted refrigerator uses the first blower to exchange heat with the refrigeration heat exchanger, cold air will be blown throughout the box, making the heat exchange in the refrigeration chamber more uniform, ensuring that the food has a consistent temperature, and at the same time reducing or eliminating the phenomenon of icing in the freezer, effectively solving the problem of easy icing of traditional portable refrigerators (there is no structure in existing vehicle-mounted refrigerators that uses a blower to exchange heat with the refrigeration chamber heat exchanger);

[0028] 2. The present invention also, through the arrangement of the insulation box and the second heat exchanger, with the second heat exchanger arranged inside the insulation box and connected to the refrigeration cycle loop, can effectively heat and / or insulate the internal air flow of the insulation box when the refrigerant flows through the second heat exchanger, thereby realizing the multi-function of simultaneous refrigeration and insulation (or heating) of the vehicle-mounted refrigerator and solving the problem of single function of portable refrigerators; The present invention also effectively utilizes the heat generated by the compressor to insulate the insulation box by arranging the compressor below the insulation box. Compared with existing dual-purpose refrigerators for heating and cooling that use electric heating for heat supply, the present invention uses the compressor exhaust to supply heat to the insulation box, effectively reducing energy consumption while ensuring the safety of refrigerator use, thereby improving the energy efficiency of the system; Since the compressor box and the insulation box are stacked vertically and horizontally arranged with the refrigeration chamber, the internal space layout of the vehicle-mounted refrigerator is more compact. Such a setting structure places the compressor at a position far from the refrigeration chamber, so it can also effectively reduce the influence on the refrigeration chamber, enhance the refrigeration heat exchange efficiency, and further improve the energy efficiency of the vehicle-mounted refrigerator.

[0029] 3. The present invention also adopts different control forms through the refrigeration heat exchanger, the first and second heat exchangers in different operating modes and at different temperatures before throttling. When refrigerating, the first heat exchanger can be preferentially turned on without turning on the second heat exchanger of the insulation box, reducing energy consumption. However, when the refrigerant temperature before throttling is higher than the first preset value, the second heat exchanger is selectively turned on, which can enhance the heat exchange effect on the refrigerant through the second heat exchanger, ensuring that the heat of the refrigerant is fully released or dissipated, thus providing conditions for providing sufficient cold energy for the refrigerant entering the refrigeration heat exchanger. Correspondingly, if the refrigerant temperature before throttling is lower than the first preset value, the second heat exchanger is selectively turned off, indicating that the state of the refrigerant at this time is sufficient to refrigerate the refrigeration heat exchanger. Therefore, turning off the second heat exchanger can effectively reduce energy consumption and further improve the energy efficiency of the vehicle-mounted refrigerator. When heating (or keeping warm), the first and second heat exchangers are both controlled to be turned on. The second heat exchanger is used to heat or keep warm the insulation box, and the internal air of the insulation box is also heated by the heat of the compressor. When the refrigerant temperature before throttling is higher than the second preset value, it indicates that the overall heat exchange performance of the first and second heat exchangers is insufficient, and the heat exchange performance of the two needs to be enhanced. At this time, since the second heat exchanger mainly plays a role in heat preservation and is not suitable for excessive adjustment, the present invention turns on or accelerates the operation of the second blower to enhance the heat exchange performance of the first heat exchanger. When the refrigerant temperature before throttling is lower than the second preset value, it indicates that the overall heat exchange performance of the first and second heat exchangers is sufficient. At this time, the rotational speed of the second blower can be considered to be reduced or it can be turned off to reduce the dissipation of the refrigerant heat energy and improve the overall energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the vehicle-mounted refrigerator of the present invention;

[0031] Figure 2 is a system diagram of the vehicle-mounted refrigerator of the present invention.

[0032] The reference numerals are as follows:

[0033] 1, refrigeration box; 2, insulation box; 31, first heat insulation member; 32, second heat insulation member; 4, compressor; 5, second heat exchanger; 6, first heat exchanger; 7, throttling device; 8, refrigeration heat exchanger; 9, push-pull handle; 10, third blower; 11, first control valve; 12, second control valve; 13, third control valve; 14, fourth control valve; 15, refrigeration box cover; 16, insulation box cover; 17, temperature acquisition device; 18, compressor box; 19, partition member; 20, second blower; 30, first blower; 101, first parallel branch; 102, second parallel branch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] As Figure 1-2 shown, the present invention provides a vehicle-mounted refrigerator, which includes:

[0035] A compressor 4, a refrigeration heat exchanger 8, a refrigeration box 1, and a first heat exchanger 6. The compressor 4, the refrigeration heat exchanger 8, and the first heat exchanger 6 are connected to form at least part of the structure in a refrigeration cycle loop. The refrigeration heat exchanger 8 is disposed inside the refrigeration box 1 to be able to refrigerate the air flow inside the refrigeration box 1. The vehicle-mounted refrigerator further includes a first blower 30, which is also disposed inside the refrigeration box 1, and the first blower 30 is disposed opposite to the refrigeration heat exchanger 8 to be able to drive or enhance the heat exchange between the air flow inside the refrigeration box 1 and the refrigeration heat exchanger 8.

[0036] Through the refrigeration heat exchanger provided in the refrigeration box of the vehicle-mounted refrigerator of the present invention, the air flow in the refrigeration box can be effectively refrigerated. And through the structure of further providing a first blower inside the refrigeration box of the vehicle-mounted refrigerator, the heat exchange between the air flow inside the refrigeration box and the refrigeration heat exchanger can be driven or enhanced. When the vehicle-mounted refrigerator uses the first blower to exchange heat with the refrigeration heat exchanger, cold air will be blown throughout the box, making the heat exchange in the refrigeration box more uniform, ensuring that the food has a consistent temperature, and at the same time reducing or eliminating the phenomenon of ice formation in the freezer, effectively solving the problem of easy ice formation in traditional portable refrigerators (there is no structure in existing vehicle-mounted refrigerators that uses a blower to exchange heat with the refrigeration chamber heat exchanger). The ice formation in existing refrigerators is because direct heat exchange is used with an evaporation coil, and the cold quantity is concentrated near the coil (ice formation usually only occurs in the freezer (i.e., the refrigeration box)). The present invention uses a blower to exchange heat with the refrigeration heat exchanger, which will blow cold air throughout the box, making the temperature more uniform and effectively avoiding ice formation.

[0037] The present invention forms a complete portable dual-purpose vehicle-mounted refrigerator system by using a freezer, an insulation box, a heat insulation member (heat insulation foam), a compressor, a refrigeration heat exchanger, a first heat exchanger, a throttling device, a second heat exchanger, a push-pull handle, a first blower, a solenoid valve, a refrigeration box cover, an insulation box cover, a second blower, a third blower, and their pipelines. In this system, the control valves are preferably normally open solenoid valves, that is, they are conductive when powered on and disconnected when powered off.

[0038] In some embodiments, it further includes a second heat exchanger 5 and an insulation box 2. The second heat exchanger 5 is disposed inside the insulation box 2 to be able to heat and / or keep warm the air flow inside the insulation box 2. The second heat exchanger 5 is also connected to the refrigeration cycle loop. The present invention also, through the setting of the insulation box and the second heat exchanger, disposes the second heat exchanger inside the insulation box and connects the second heat exchanger to the refrigeration cycle loop, and can effectively heat and / or keep warm the air flow inside the insulation box by using the refrigerant flowing through the second heat exchanger, thereby realizing the multi-function of the vehicle-mounted refrigerator for simultaneous refrigeration and heat preservation (or heating), and solving the problem of single function of the portable refrigerator.

[0039] In some embodiments, a heat preservation box cover 16 is provided at the upper end of the heat preservation box 2. The heat preservation box cover 16 can be rotated to open the heat preservation box 2, forming a flip-up structure. A refrigeration box cover 15 is provided at the upper end of the refrigeration box 1. The refrigeration box cover 15 can be rotated to open the refrigeration box 1, forming a flip-up structure. By providing box covers at the upper ends of both the heat preservation box and the refrigeration box and adopting a flipping method to open the box body, compared with the push-pull structure of a household air conditioner, the space is utilized more reasonably, the occupied floor area during use is reduced, and the structure becomes more compact.

[0040] Figure 1 It is a schematic structural diagram of a vehicle-mounted refrigerator. The refrigeration box 1 (or freezer) and the heat preservation box 2 are distributed left and right, and each has a separate upper cover, namely the refrigeration box cover 15 and the heat preservation box cover 16. This design can ensure a large bottom area and a low center of gravity, guaranteeing stability during vehicle driving or when opening the refrigerator cover (the horizontal design can increase the bottom area, and placing the compressor at the bottom can lower the center of gravity). The upper covers of the refrigeration box and the heat preservation box can be opened separately, reducing the mutual influence between the cold and warm boxes. At the same time, it is a flip-up design, which can utilize the occupied space more reasonably compared with the push-pull type of household air conditioners and is more suitable for the usage scenario. The compressor is placed at the bottom of the compressor box under the heat preservation box 2. First, based on the principle that hot air has a small density and transfers heat upward, the heat generated by the compressor itself during operation can better keep the heat preservation box 2 warm, minimizing the impact on the refrigeration box 1 to the greatest extent. Second, based on the fact that the usage time of the refrigeration mode of a portable refrigerator is much longer than that of the heat preservation mode, placing the compressor under the heat preservation box can ensure the volume of the freezer.

[0041] In some embodiments, a compressor box 18 is further included. The compressor 4 is arranged inside the compressor box 18. The first heat exchanger 6 is arranged on the compressor box 18 to exchange heat between the refrigerant and the outside of the vehicle. Through the arrangement of the compressor box, the present invention can accommodate the compressor therein. The first heat exchanger is arranged on the compressor box, effectively setting up the first heat exchanger. The first heat exchanger is used to exchange heat with the air in the outside space of the vehicle, so as to effectively suck out the heat in the refrigeration box and discharge it to the outside space through the first heat exchanger, ensuring the effective operation of the refrigeration function of the refrigerator.

[0042] In some embodiments, the compressor box 18 and the heat preservation box 2 are stacked vertically, with the heat preservation box 2 located at the upper end of the compressor box 18. The compressor box 18 and the heat preservation box 2 form an integral structure. The heat preservation box 2 and the refrigeration box 1 are connected or arranged at intervals in the horizontal direction.

[0043] The present invention can also effectively utilize the heat generated by the compressor to keep the insulation box warm by arranging the compressor below the insulation box. Compared with the existing cold and warm dual-purpose refrigerators that use electric heating for heating, the present invention uses the compressor exhaust to heat the insulation box, effectively reducing energy consumption while ensuring the safety of the refrigerator during use, thereby improving the energy efficiency of the system. Since the compressor box and the insulation box are stacked vertically and horizontally arranged with the refrigeration box, the internal space layout of the vehicle-mounted refrigerator is more compact. Such a structural arrangement places the compressor at a position farther away from the refrigeration box, so it can also effectively reduce the impact on the refrigeration box, enhance the refrigeration and heat exchange efficiency, and further improve the energy efficiency of the vehicle-mounted refrigerator.

[0044] In some embodiments, a first heat insulation member 31 is provided between the compressor box 18 and the refrigeration box 1; a second heat insulation member 32 is provided between the insulation box 2 and the refrigeration box 1; a partition member 19 is provided between the compressor box 18 and the insulation box 2, and the partition member 19 is a heat-conducting structure. The present invention can effectively insulate the compressor box and the refrigeration box through the first heat insulation member provided therebetween, further effectively preventing the heat generated by the compressor from affecting the air temperature change in the refrigeration box, ensuring continuous and effective refrigeration in the refrigeration box, and improving energy efficiency; the second heat insulation member between the insulation box and the refrigeration box can also effectively insulate between the insulation box and the refrigeration box, ensuring continuous and effective refrigeration in the refrigeration box and also ensuring that the heat in the insulation box will not be lost, improving energy efficiency; and the present invention also passes through the heat-conducting partition member provided between the compressor box and the insulation box, which can physically separate the upper and lower insulation box and compressor box, but can transfer the heat generated by the compressor to the insulation box, improving the heating effect on the insulation box and improving the energy efficiency of the system.

[0045] In some embodiments, a second blower 20 and a third blower 10 are further included. The second blower 20 is disposed inside, on the wall surface, or outside the compressor box 18 (here, "inside" refers to the space inside the compressor box body that does not contact the inner wall surface or the second blower is disposed on the bottom plate; "outside" refers to the space outside the compressor box body that does not contact the outer wall surface; the wall surface includes the inner wall surface and the outer wall surface, that is, the second blower can be disposed on the inner wall surface or the outer wall surface), and the second blower 20 is disposed opposite to the first heat exchanger 6 to drive or enhance the heat exchange between the airflow outside the vehicle and the first heat exchanger 6; the third blower 10 is disposed inside the insulation box 2, and the third blower 10 is disposed opposite to the second heat exchanger 5 to drive or enhance the heat exchange between the airflow inside the insulation box 2 and the second heat exchanger 5. The present invention can also enhance the heat exchange efficiency between the refrigerant and the outside of the vehicle at the first heat exchanger through the action of the second blower; the third blower acts on the second heat exchanger, and can enhance the heat exchange efficiency between the refrigerant and the inside of the insulation box at the second heat exchanger.

[0046] In some embodiments, a first control valve 11, a first parallel branch 101, and a second control valve 12 are further included. One end of the second heat exchanger 5 can communicate with the exhaust end of the compressor 4, and the other end can communicate with one end of the first heat exchanger 6. The first control valve 11 is disposed between the second heat exchanger 5 and the compressor 4 or at a position between the second heat exchanger 5 and the first heat exchanger 6; the first parallel branch 101 is connected in parallel at both ends after the second heat exchanger 5 and the first control valve 11 are connected in series, and the second control valve 12 is disposed on the first parallel branch 101.

[0047] Through the arrangement of the first and second control valves and the first parallel branch, the present invention can make the first parallel branch be connected in parallel to the series connection of the second heat exchanger and the first control valve, so as to be able to control whether to short-circuit the second heat exchanger as needed. That is, when the second heat exchanger needs to exchange heat, the first control valve is opened; when the second heat exchanger does not need to exchange heat, the first control valve is closed and the second control valve is opened at the same time, so as to effectively control the second heat exchanger in the insulation box according to different operating modes and other conditions such as temperature conditions, etc., and ensure that the vehicle-mounted refrigerator can complete refrigeration and heat preservation with high energy efficiency.

[0048] In some embodiments, a throttling device 7 and a temperature acquisition device 17 are further included. The throttling device 7 is disposed between the first heat exchanger 6 and the refrigeration heat exchanger 8, and the temperature acquisition device 17 is disposed on the refrigerant pipeline between the first heat exchanger 6 and the throttling device 7. The present invention can also throttle and depressurize the refrigerant after passing through the first heat exchanger through the throttling device, and can effectively detect the temperature of the refrigerant at the outlet of the first heat exchanger through the temperature acquisition device. Whether the refrigerant is sufficiently condensed and releases heat can be effectively and accurately judged by the height of this temperature. If so, it is considered not to turn on the second heat exchanger 5, which can effectively save energy and improve energy efficiency. If not, it is considered to turn on the second heat exchanger, which can ensure that the refrigerant is sufficiently condensed and releases heat, and provides conditions for sufficient refrigeration in the refrigeration heat exchanger 8 to ensure sufficient refrigeration capacity. Therefore, the above structure of the present invention can detect and obtain whether the refrigerant is sufficiently condensed, and selectively turn on or off the second heat exchanger according to whether it is sufficiently condensed, so that on the basis of ensuring sufficient refrigeration capacity of the refrigeration heat exchanger, the energy consumption can be effectively reduced and the overall energy efficiency of the system can be improved.

[0049] In some embodiments, a third control valve 13, a fourth control valve 14 and a second parallel branch 102 are further included. One end of the refrigeration heat exchanger 8 can be communicated with the suction end of the compressor 4, and the other end can be communicated with the throttling device 7. The fourth control valve 14 is disposed at a position between the refrigeration heat exchanger 8 and the compressor 4 or between the refrigeration heat exchanger 8 and the throttling device 7; the second parallel branch 102 is connected in parallel at both ends after the refrigeration heat exchanger 8 and the fourth control valve 14 are connected in series, and the third control valve 13 is disposed on the second parallel branch 102.

[0050] Through the setting of the third and fourth control valves and the second parallel branch, the present invention can make the second parallel branch be connected in parallel after the refrigeration heat exchanger and the fourth control valve are connected in series, so that it can be controlled whether to short-circuit the refrigeration heat exchanger as needed. That is, when the refrigeration heat exchanger needs to exchange heat, the fourth control valve is opened, and when the refrigeration heat exchanger does not need to exchange heat, the fourth control valve is closed and the third control valve is opened at the same time. Preferably, the refrigeration heat exchanger can be connected and operated in both the normal refrigeration mode or the heat preservation mode, and when the temperature in the refrigeration box reaches the required temperature and the system needs to be slowly shut down, the second parallel branch can be connected and the refrigeration heat exchanger can be disconnected.

[0051] The present invention also provides a control method for a vehicle-mounted refrigerator as described above, which includes:

[0052] A detection step of detecting the mode of the vehicle-mounted refrigerator and detecting the temperature of the refrigerant collected by the temperature acquisition device;

[0053] A judgment step of judging whether the mode of the vehicle-mounted refrigerator is a refrigeration mode or a heat preservation mode, and judging the relationship between the temperature T collected by the temperature collection device and the first preset temperature value T1 or the second preset temperature value T2;

[0054] A control step, when the mode of the vehicle-mounted refrigerator is the refrigeration mode and the temperature T collected by the temperature collection device is less than or equal to the first preset temperature value T1, controlling the first heat exchanger 6 to heat, the second heat exchanger 5 not to heat, and the refrigeration heat exchanger 8 to refrigerate; when the mode of the vehicle-mounted refrigerator is the refrigeration mode and the temperature T collected by the temperature collection device is greater than the first preset temperature value T1, controlling both the first heat exchanger 6 and the second heat exchanger 5 to operate in heating, and the refrigeration heat exchanger 8 to refrigerate;

[0055] When the mode of the vehicle-mounted refrigerator is the heat preservation mode and the temperature T collected by the temperature collection device is less than or equal to the second preset temperature value T2, controlling both the first heat exchanger 6 and the second heat exchanger 5 to operate in heating, the refrigeration heat exchanger 8 to refrigerate, and at the same time controlling the second blower 20 to close or decelerate; when the mode of the vehicle-mounted refrigerator is the heat preservation mode and the temperature T collected by the temperature collection device is greater than the second preset temperature value T2, controlling both the first heat exchanger 6 and the second heat exchanger 5 to operate in heating, the refrigeration heat exchanger 8 to refrigerate, and at the same time controlling the second blower 20 to start or accelerate.

[0056] The control method of the present invention adopts different control forms through the refrigeration heat exchanger, the first and second heat exchangers in different operating modes and different temperatures before throttling. When refrigerating, the first heat exchanger can be preferentially turned on without turning on the second heat exchanger of the incubator, reducing energy consumption. However, when the refrigerant temperature before throttling is higher than the first preset value, the second heat exchanger is selectively turned on, which can enhance the heat exchange effect on the refrigerant through the second heat exchanger, ensuring that the heat of the refrigerant is fully released or dissipated, thus providing conditions for providing sufficient cold energy for entering the refrigeration heat exchanger. Correspondingly, if the refrigerant temperature before throttling is lower than the first preset value, the second heat exchanger is selectively turned off, indicating that the state of the refrigerant is sufficient to refrigerate the refrigeration heat exchanger at this time. Therefore, turning off the second heat exchanger can effectively reduce energy consumption and further improve the energy efficiency of the vehicle-mounted refrigerator. When heating (or keeping warm), the first and second heat exchangers are controlled to be turned on simultaneously. The second heat exchanger is used to heat or keep warm the incubator, and the internal air of the incubator is heated by the heat of the compressor. When the refrigerant temperature before throttling is higher than the second preset value, it indicates that the overall heat exchange performance of the first and second heat exchangers is insufficient, and the heat exchange performance of the two needs to be enhanced. At this time, since the second heat exchanger mainly plays a role in heat preservation and is not suitable for excessive adjustment, the present invention turns on or accelerates the operation of the second fan, thereby enhancing the heat exchange performance of the first heat exchanger. When the refrigerant temperature before throttling is lower than the second preset value, it indicates that the overall heat exchange performance of the first and second heat exchangers is sufficient. At this time, the rotation speed of the second fan can be considered to be reduced or turned off, thereby reducing the dissipation of the refrigerant heat energy and improving the overall energy efficiency.

[0057] Thus, when the refrigerant condenses sufficiently in the refrigeration mode, the second heat exchanger 5 in the incubator is disconnected, reducing energy consumption and improving the energy efficiency of the system. When the refrigerant does not condense sufficiently in the refrigeration mode, the second heat exchanger 5 is connected, and the condensation heat release effect on the refrigerant is enhanced through the second heat exchanger 5 and the first heat exchanger 6, ensuring that the refrigeration capacity in the refrigeration box is sufficient and adequate. It can ensure the refrigeration effect while improving the energy efficiency of the system. In the heat preservation mode, the second and first heat exchangers work simultaneously. When the refrigerant condenses sufficiently, the rotation speed of the second fan is turned off or reduced to reduce energy consumption and improve the energy efficiency of the system. When the refrigerant does not condense sufficiently, the second fan 20 is turned on or accelerated, thereby enhancing the condensation heat release effect and ensuring that the refrigeration capacity in the refrigeration box is sufficient and adequate. Therefore, the present invention can effectively ensure that the refrigeration capacity of the refrigeration box is sufficient and adequate while improving the energy efficiency of the whole machine system both in the refrigeration mode and the heat preservation mode.

[0058] In some embodiments, when the first control valve 11, the second control valve 12, the third control valve 13 and the fourth control valve 14 are included simultaneously:

[0059] In the control step, when the mode of the vehicle-mounted refrigerator is the refrigeration mode and T ≤ T1, control the first control valve 11 to disconnect, the second control valve 12 to connect, the third control valve 13 to disconnect, and the fourth control valve 14 to connect; when the mode of the vehicle-mounted refrigerator is the refrigeration mode and T > T1, control the first control valve 11 to connect, the second control valve 12 to disconnect, the third control valve 13 to disconnect, and the fourth control valve 14 to connect;

[0060] When the mode of the vehicle-mounted refrigerator is the heat preservation mode and T ≤ T2, control the first control valve 11 to connect, the second control valve 12 to disconnect, the third control valve 13 to disconnect, and the fourth control valve 14 to connect, and at the same time control the second blower 20 to close or decelerate; when the mode of the vehicle-mounted refrigerator is the heat preservation mode and T > T2, control the first control valve 11 to connect, the second control valve 12 to disconnect, the third control valve 13 to disconnect, and the fourth control valve 14 to connect, and at the same time control the second blower 20 to start or accelerate.

[0061] This is the specific control method for the four control valves according to the high and low temperature of the refrigerant before throttling in the refrigeration mode or heat preservation mode of the present invention. When the refrigerant condenses sufficiently in the refrigeration mode, the second heat exchanger 5 in the insulation box is disconnected to reduce energy consumption and improve the system energy efficiency. When the refrigerant does not condense sufficiently in the refrigeration mode, the second heat exchanger 5 is connected at the same time to enhance the condensation heat release effect of the refrigerant and ensure that the refrigeration capacity in the refrigeration box is sufficient and full; while ensuring the refrigeration effect, the system energy efficiency is also improved; in the heat preservation mode, the second and first heat exchangers work at the same time. When the refrigerant condenses sufficiently, the speed of the second blower is closed or decelerated to reduce energy consumption and improve the system energy efficiency. When the refrigerant does not condense sufficiently, the second blower 20 is turned on or accelerated, thereby enhancing the condensation heat release effect and ensuring that the refrigeration capacity in the refrigeration box is sufficient and full. Therefore, the present invention can effectively ensure that the refrigeration capacity of the refrigeration box is sufficient and full while improving the energy efficiency of the whole machine system both in the refrigeration mode and the heat preservation mode.

[0062] In some embodiments, in the control step, when the mode of the vehicle-mounted refrigerator is the refrigeration mode, if the temperature in the refrigeration box is lower than the third preset temperature T3 and the vehicle-mounted refrigerator needs to be slowly shut down, control the compressor 4 to shut down and the third control valve 13 to connect and the fourth control valve 14 to disconnect. The present invention can also ensure that the compressor can be shut down normally and stably when the temperature in the refrigeration box meets the requirements and is slowly shut down through the setting of the second parallel branch, effectively reducing energy consumption while ensuring sufficient refrigeration capacity in the refrigeration box and improving the system energy efficiency.

[0063] In some embodiments, when the temperature T collected by the temperature acquisition device within the first preset time t1 is all ≤ T1, it is determined that T ≤ T1; when the temperature T collected by the temperature acquisition device within the first preset time t1 is all > T1, it is determined that T > T1; when the temperature T collected by the temperature acquisition device within the second preset time t2 is all ≤ T2, it is determined that T ≤ T2; when the temperature T collected by the temperature acquisition device within the second preset time t2 is all > T2, it is determined that T > T2. This is the specific determination method for the magnitude relationship between T and T1 and between T and T2 in the present invention. It can be determined to meet the above inequalities only if it is detected multiple times to meet within a certain period of time, which can ensure that the entered state is a stable temperature state rather than an unstable fluctuating state. At this time, the system is more stable and the control accuracy is higher.

[0064] In some embodiments, t1 = 1 min, and the temperature acquisition device collects a set of temperature data every 10 s within 1 min; t2 = 1 min, and the temperature acquisition device collects a set of temperature data every 10 s within 1 min; T1 = T2 = 50°C - 60°C. This is the preferred duration of a certain period of time and the preferred numerical range of two preset temperatures in the present invention.

[0065] Figure 2 It is a system diagram of the vehicle-mounted refrigerator of the present invention.

[0066] Refrigeration principle: In the initial stage, the second control valve 12 is energized to be attracted and conduct, and the first control valve 11 is de-energized and disconnected. The high-temperature and high-pressure gaseous refrigerant coming out of the compressor does not pass through the second heat exchanger 5, but directly enters the first heat exchanger 6 for heat exchange. After coming out, the low-temperature and high-pressure liquid refrigerant enters the throttling device 7 for throttling and pressure reduction, and then the low-pressure and low-temperature liquid refrigerant enters the refrigeration heat exchanger 8 to absorb heat. At this time, the fourth control valve 14 is in the attracted and conducting state, and the third control valve 13 is in the disconnected state. After the heat exchange is completed, the gaseous refrigerant enters the compressor for compression again. During the operation of the refrigeration mode, the temperature acquisition device 17 continuously collects the temperature of the refrigerant after heat exchange through the first heat exchanger 6. If the temperature collected within 1 min (collecting a set every 10 s) is all greater than the limit temperature (generally set at 50°C - 60°C), the second control valve 12 is de-energized and disconnected, and the first control valve 11 is energized to be attracted. The second heat exchanger 5 participates in the heat exchange (the second heat exchanger 5 is not opened first during refrigeration. This condition indicates that the heat dissipation amount during the heat exchange of the first heat exchanger 6 alone is insufficient, and the refrigerant temperature is too high. When the first heat exchanger 6 is not sufficient to condense and release heat to the refrigerant, the second heat exchanger 5 is opened to ensure the heat exchange performance of the refrigeration heat exchanger 8), ensuring that the freezer can reach the set temperature value until the temperature acquisition device 17 collects the temperature within 1 min (collecting a set every 10 s) that is all less than the limit temperature (generally set at 50°C - 60°C), and then resumes the initial stage operation state.

[0067] Heating principle: The first control valve 11 is energized and attracted, the second control valve 12 is de-energized and disconnected. The high-temperature and high-pressure exhaust gas of the compressor enters the insulation box to exchange heat with the second heat exchanger 5, and then enters the first heat exchanger 6. If the temperature acquisition device 17 collects temperatures greater than the limit temperature (generally set at 50°C - 60°C) within 1 minute (collecting a group every 10 seconds), then the second fan 20 (i.e., the heat exchange fan) is energized to rotate to accelerate heat dissipation, otherwise it does not operate. The high-pressure normal-temperature liquid refrigerant coming out of the first heat exchanger 6 enters the throttling device 7 to throttle and reduce pressure. At this time, the fourth control valve 14 is energized and attracted, and the third control valve 13 is de-energized and disconnected (when refrigerating, if the refrigeration box reaches the set temperature and the system needs to slowly shut down, the third control valve 13 is attracted and the fourth control valve 14 is disconnected). The low-pressure and low-temperature refrigerant enters the refrigeration heat exchanger 8 to absorb heat, and then enters the compressor.

[0068] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and variations can be made, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A vehicle-mounted refrigerator, characterized in that: Comprising: A compressor (4), a refrigeration heat exchanger (8), a refrigeration box (1), and a first heat exchanger (6). The compressor (4), the refrigeration heat exchanger (8), and the first heat exchanger (6) are connected to form at least part of the structure in a refrigeration cycle loop. The refrigeration heat exchanger (8) is disposed inside the refrigeration box (1) to be able to refrigerate the air flow inside the refrigeration box (1). The vehicle-mounted refrigerator further includes a first blower (30), which is also disposed inside the refrigeration box (1), and the first blower (30) is disposed opposite to the refrigeration heat exchanger (8) to be able to drive or enhance the heat exchange between the air flow inside the refrigeration box (1) and the refrigeration heat exchanger (8); It further includes a second heat exchanger (5) and a heat preservation box (2). The second heat exchanger (5) is disposed inside the heat preservation box (2) to be able to heat and / or keep warm the air flow inside the heat preservation box (2). The second heat exchanger (5) is also connected to the refrigeration cycle loop; It further includes a compressor box (18). The compressor (4) is disposed inside the compressor box (18), and the first heat exchanger (6) is disposed on the compressor box (18) to be able to exchange heat between the refrigerant and the outside of the vehicle; It further includes a second blower (20) and a third blower (10). The second blower (20) is disposed inside, on the wall surface, or outside the compressor box (18), and the second blower (20) is disposed opposite to the first heat exchanger (6) to be able to drive or enhance the heat exchange between the air flow outside the vehicle and the first heat exchanger (6); The third blower (10) is disposed inside the heat preservation box (2), and the third blower (10) is disposed opposite to the second heat exchanger (5) to be able to drive or enhance the heat exchange between the air flow inside the heat preservation box (2) and the second heat exchanger (5); The control method of the vehicle-mounted refrigerator includes: A detection step of detecting the mode of the vehicle-mounted refrigerator and detecting the temperature of the refrigerant before throttling collected by the temperature acquisition device; A judgment step of judging whether the mode of the vehicle-mounted refrigerator is a refrigeration mode or a heat preservation mode, and judging the relationship between the temperature T collected by the temperature acquisition device and a first preset temperature value T1 or a second preset temperature value T2; A control step. When the mode of the vehicle-mounted refrigerator is a refrigeration mode and the temperature T collected by the temperature acquisition device is less than or equal to the first preset temperature value T1, controlling the first heat exchanger (6) to heat, the second heat exchanger (5) not to heat, and the refrigeration heat exchanger (8) to refrigerate; When the mode of the vehicle-mounted refrigerator is a refrigeration mode and the temperature T collected by the temperature acquisition device is greater than the first preset temperature value T1, controlling both the first heat exchanger (6) and the second heat exchanger (5) to operate in a heating mode, and the refrigeration heat exchanger (8) to refrigerate; When the mode of the vehicle-mounted refrigerator is the heat preservation mode, and the temperature T collected by the temperature acquisition device is less than or equal to the second preset temperature value T2, control the first heat exchanger (6) and the second heat exchanger (5) to operate in heating mode, the refrigeration heat exchanger (8) to operate in refrigeration mode, and at the same time control the second blower (20) to be turned off or decelerated; when the mode of the vehicle-mounted refrigerator is the heat preservation mode, and the temperature T collected by the temperature acquisition device is greater than the second preset temperature value T2, control the first heat exchanger (6) and the second heat exchanger (5) to operate in heating mode, the refrigeration heat exchanger (8) to operate in refrigeration mode, and at the same time control the second blower (20) to be turned on or accelerated.

2. The vehicle-mounted refrigerator according to claim 1, characterized in that: The upper end of the heat preservation box (2) is provided with a heat preservation box cover (16), and the heat preservation box cover (16) can be rotated to open the heat preservation box (2) to form a flip-up structure; the upper end of the refrigeration box (1) is provided with a refrigeration box cover (15), and the refrigeration box cover (15) can be rotated to open the refrigeration box (1) to form a flip-up structure.

3. The vehicle-mounted refrigerator according to claim 1, characterized in that: The compressor box (18) and the heat preservation box (2) are stacked vertically, and the heat preservation box (2) is located at the upper end of the compressor box (18); the compressor box (18) and the heat preservation box (2) form an integral structure; the heat preservation box (2) and the refrigeration box (1) are connected or arranged at intervals in the horizontal direction.

4. The vehicle-mounted refrigerator according to claim 3, characterized in that: A first heat insulation member (31) is provided between the compressor box (18) and the refrigeration box (1); a second heat insulation member (32) is provided between the heat preservation box (2) and the refrigeration box (1); a partition member (19) is provided between the compressor box (18) and the heat preservation box (2), and the partition member (19) is a heat-conducting structure.

5. The vehicle-mounted refrigerator according to claim 1, characterized in that: It further includes a first control valve (11), a first parallel branch (101) and a second control valve (12). One end of the second heat exchanger (5) can be communicated with the exhaust end of the compressor (4), and the other end can be communicated with one end of the first heat exchanger (6). The first control valve (11) is arranged between the second heat exchanger (5) and the compressor (4), or at a position between the second heat exchanger (5) and the first heat exchanger (6); the first parallel branch (101) is connected in parallel at both ends after the second heat exchanger (5) and the first control valve (11) are connected in series, and the second control valve (12) is arranged on the first parallel branch (101).

6. The vehicle-mounted refrigerator according to claim 5, characterized in that: It further includes a throttling device (7) and a temperature acquisition device (17). The throttling device (7) is arranged between the first heat exchanger (6) and the refrigeration heat exchanger (8), and the temperature acquisition device (17) is arranged on the refrigerant pipeline between the first heat exchanger (6) and the throttling device (7).

7. The in-vehicle refrigerator according to claim 6, characterized in that: It further includes a third control valve (13), a fourth control valve (14) and a second parallel branch (102). One end of the refrigeration heat exchanger (8) can be communicated with the suction end of the compressor (4), and the other end can be communicated with the throttling device (7). The fourth control valve (14) is arranged between the refrigeration heat exchanger (8) and the compressor (4), or at a position between the refrigeration heat exchanger (8) and the throttling device (7); The second parallel branch (102) is arranged in parallel at both ends after the refrigeration heat exchanger (8) and the fourth control valve (14) are connected in series, and the third control valve (13) is arranged on the second parallel branch (102).

8. A control method for a vehicle-mounted refrigerator according to any one of claims 1-7, characterized in that: Including: A detection step of detecting the mode of the in-vehicle refrigerator and detecting the temperature of the refrigerant before throttling collected by the temperature acquisition device; A judgment step of judging whether the mode of the in-vehicle refrigerator is a refrigeration mode or a heat preservation mode, and judging the relationship between the temperature T collected by the temperature acquisition device and the first preset temperature value T1 or the second preset temperature value T2; A control step. When the mode of the in-vehicle refrigerator is the refrigeration mode and the temperature T collected by the temperature acquisition device is less than or equal to the first preset temperature value T1, control the first heat exchanger (6) to generate heat, the second heat exchanger (5) does not generate heat, and the refrigeration heat exchanger (8) refrigerates; When the mode of the in-vehicle refrigerator is the refrigeration mode and the temperature T collected by the temperature acquisition device is greater than the first preset temperature value T1, control both the first heat exchanger (6) and the second heat exchanger (5) to operate in heating, and the refrigeration heat exchanger (8) refrigerates; When the mode of the in-vehicle refrigerator is the heat preservation mode and the temperature T collected by the temperature acquisition device is less than or equal to the second preset temperature value T2, control both the first heat exchanger (6) and the second heat exchanger (5) to operate in heating, the refrigeration heat exchanger (8) refrigerates, and at the same time control the second blower (20) to close or decelerate; When the mode of the in-vehicle refrigerator is the heat preservation mode and the temperature T collected by the temperature acquisition device is greater than the second preset temperature value T2, control both the first heat exchanger (6) and the second heat exchanger (5) to operate in heating, the refrigeration heat exchanger (8) refrigerates, and at the same time control the second blower (20) to turn on or accelerate.

9. The control method according to claim 8, characterized in that: When the first control valve (11), the second control valve (12), the third control valve (13) and the fourth control valve (14) are included at the same time: In the control step, when the mode of the vehicle-mounted refrigerator is the refrigeration mode and T ≤ T1, control the first control valve (11) to disconnect, the second control valve (12) to connect, the third control valve (13) to disconnect, and the fourth control valve (14) to connect; when the mode of the vehicle-mounted refrigerator is the refrigeration mode and T > T1, control the first control valve (11) to connect, the second control valve (12) to disconnect, the third control valve (13) to disconnect, and the fourth control valve (14) to connect; When the mode of the vehicle-mounted refrigerator is the heat preservation mode and T ≤ T2, control the first control valve (11) to connect, the second control valve (12) to disconnect, the third control valve (13) to disconnect, the fourth control valve (14) to connect, and at the same time control the second blower (20) to close or decelerate; when the mode of the vehicle-mounted refrigerator is the heat preservation mode and T > T2, control the first control valve (11) to connect, the second control valve (12) to disconnect, the third control valve (13) to disconnect, the fourth control valve (14) to connect, and at the same time control the second blower (20) to start or accelerate.

10. The control method according to claim 9, wherein: Control step, when the mode of the vehicle-mounted refrigerator is the refrigeration mode, if the temperature in the refrigeration box is lower than the third preset temperature T3 and the vehicle-mounted refrigerator needs to be slowly shut down, control the compressor (4) to shut down, the third control valve (13) to connect, and the fourth control valve (14) to disconnect.

11. The control method according to claim 9, wherein: When the temperature T collected by the temperature acquisition device within the first preset time t1 is all ≤ T1, it is determined that T ≤ T1; when the temperature T collected by the temperature acquisition device within the first preset time t1 is all > T1, it is determined that T > T1; when the temperature T collected by the temperature acquisition device within the second preset time t2 is all ≤ T2, it is determined that T ≤ T2; when the temperature T collected by the temperature acquisition device within the second preset time t2 is all > T2, it is determined that T > T2.

12. The control method according to claim 11, wherein: t1 = 1min, and the temperature acquisition device collects a set of temperature data every 10s within 1min; t2 = 1min, and the temperature acquisition device collects a set of temperature data every 10s within 1min; T1 = T2 = 50°C - 60°C.

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