Refrigerating system, storage box and control method

Abstract

The invention provides a refrigerating system, a storage box and a control method. The refrigerating system comprises a compressor and a condenser, and an air outlet of the compressor communicates with an inlet of the condenser; the evaporation branch is used for refrigerating the storage space of the box body of the storage box, at least two evaporators which are arranged in series are arranged on the evaporation branch, the at least two evaporators are arranged on the box body of the storage box at intervals, and the evaporation branch is provided with a first communication port and a second communication port; wherein the evaporation branch has a first evaporation state and a second evaporation state; when the evaporation branch is in a first evaporation state, the first communication port is communicated with an outlet of the condenser, and the second communication port is communicated with an air inlet of the compressor; and when the evaporation branch is in the second evaporation state, the first communicating opening communicates with the air inlet of the compressor, and the second communicating opening communicates with the outlet of the condenser. Through the technical scheme provided by the invention, the technical problem that the temperature uniformity in the box body of the storage box in the prior art is relatively poor can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of preservation boxes, and in particular to a refrigeration system, a preservation box and a control method. Background Art

[0002] At present, medical cryopreservation boxes are mainly used to store valuable biological samples such as cells, tissues, viruses, fertilized eggs, and clinical samples, which have extremely high storage quality requirements. Temperature stability and temperature uniformity in the box are two important factors affecting sample storage quality.

[0003] However, low-temperature storage boxes in the prior art usually use direct cooling for refrigeration, and the box volume is large, which often leads to large temperature differences at different positions in the storage box, resulting in poor box temperature uniformity, affecting the low-temperature storage effect of the storage box. Summary of the invention

[0004] The main purpose of the present invention is to provide a refrigeration system, a preservation box and a control method to solve the technical problem of poor temperature uniformity in the preservation box in the prior art.

[0005] In order to achieve the above object, according to one aspect of the present invention, a refrigeration system is provided, comprising:

[0006] A compressor and a condenser, wherein the air outlet of the compressor is connected to the inlet of the condenser;

[0007] An evaporation branch, the evaporation branch is used to refrigerate the storage space of the box body of the preservation box, the evaporation branch is provided with at least two evaporators arranged in series, at least two of the evaporators are arranged on the box body of the preservation box at intervals, and the evaporation branch has a first communication port and a second communication port;

[0008] Wherein, the evaporation branch has a first evaporation state and a second evaporation state; when the evaporation branch is in the first evaporation state, the first connecting port is connected to the outlet of the condenser, and the second connecting port is connected to the air inlet of the compressor; when the evaporation branch is in the second evaporation state, the first connecting port is connected to the air inlet of the compressor, and the second connecting port is connected to the outlet of the condenser.

[0009] Furthermore, the refrigeration system further comprises:

[0010] A switching structure, wherein the first connecting port, the second connecting port, the outlet of the condenser and the air inlet of the compressor are all connected to the switching structure, and the switching structure has a first switching state and a second switching state; when the switching structure is in the first switching state, the evaporation branch is in the first evaporation state; when the switching structure is in the second switching state, the evaporation branch is in the second evaporation state.

[0011] Further, the switching structure is a four-way valve, which has a first switching port connected to the air inlet of the compressor, a second switching port connected to the second connecting port, a third switching port connected to the outlet of the condenser, and a fourth switching port connected to the first connecting port; when the four-way valve is in the first switching state, the first switching port is connected to the second switching port, and the third switching port is connected to the fourth switching port; when the four-way valve is in the second switching state, the second switching port is connected to the third switching port, and the first switching port is connected to the fourth switching port.

[0012] Furthermore, the refrigeration system further comprises:

[0013] an anti-condensation tube, one end of which is connected to the outlet of the condenser, and the other end of which is connected to the first connecting port or the second connecting port; and / or,

[0014] a throttling member, one end of which is connected to the outlet of the condenser, and the other end of which is connected to the first connecting port or the second connecting port; and / or,

[0015] A drying filter, one end of which is communicated with the outlet of the condenser, and the other end of which is communicated with the first communication port or the second communication port.

[0016] Furthermore, at least two of the evaporators are arranged at intervals along the height direction of the box body of the preservation box.

[0017] According to another aspect of the present invention, there is provided a storage box, comprising:

[0018] A box body, wherein the box body has a storage space;

[0019] In the refrigeration system provided above, the evaporation branch of the refrigeration system is arranged in the storage space or in contact with the wall surface of the box body.

[0020] Furthermore, the storage box also includes:

[0021] A temperature detection element is disposed in the box body, and is used to detect the temperature in the box body;

[0022] A control component, the temperature detection component and the refrigeration system are both connected to the control component, and the control component controls the refrigeration system according to the detection result of the temperature detection component.

[0023] Further, there are at least two temperature detection members, and the at least two temperature detection members are spaced apart along the height direction of the box; and / or,

[0024] The box body comprises a main body and a door, the door is movably arranged on the main body, and the temperature detection element is arranged on a side of the main body away from the door; and / or,

[0025] The storage box also includes a plurality of support frames, and the plurality of support frames are arranged in the storage space at intervals.

[0026] According to another aspect of the present invention, a control method is provided, which is applicable to the above-mentioned preservation box, and the control method comprises:

[0027] Obtaining the upper temperature T1 of the storage space of the preservation box and the lower temperature T2 of the storage space;

[0028] According to the upper temperature T1 of the storage space and the lower temperature T2 of the storage space, the operating state of the compressor of the refrigeration system of the preservation box and / or the connection state of the evaporation branch of the refrigeration system are controlled.

[0029] Further, the operating state of the compressor of the refrigeration system of the preservation box and / or the connection state of the evaporation branch of the refrigeration system are controlled according to the upper temperature T1 of the storage space and the lower temperature T2 of the storage space, including:

[0030] Comparing the upper temperature T1 of the storage space with a preset temperature range, and comparing the lower temperature T2 of the storage space with the preset temperature range;

[0031] The operating state of the compressor of the refrigeration system and / or the connectivity state of the evaporation branch of the refrigeration system are controlled according to the comparison result between the upper temperature T1 of the storage space and the preset temperature range and the comparison result between the lower temperature T2 of the storage space and the preset temperature range.

[0032] Further, when the evaporation branch is in the first evaporation state, the refrigerant in the evaporation branch flows from the evaporator located at the upper layer to the evaporator located at the lower layer; when the evaporation branch is in the second evaporation state, the refrigerant in the evaporation branch flows from the evaporator located at the lower layer to the evaporator located at the upper layer; the operation state of the compressor of the refrigeration system and / or the connection state of the evaporation branch of the refrigeration system are controlled according to the comparison result of the upper temperature T1 of the storage space and the preset temperature range and the comparison result of the lower temperature T2 of the storage space and the preset temperature range, including:

[0033] When the upper temperature T1 of the storage space and the lower temperature T2 of the storage space are both within the preset temperature range, the evaporation branch is controlled to be maintained in the first evaporation state, and the compressor is controlled to be maintained at the current speed;

[0034] When at least one of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space is not within the preset temperature range, the operating state of the compressor of the refrigeration system and / or the connectivity state of the evaporation branch of the refrigeration system is controlled based on the comparison result of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space with the preset temperature range.

[0035] Further, when at least one of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space is not within the preset temperature range, the operating state of the compressor of the refrigeration system and / or the connection state of the evaporation branch of the refrigeration system is controlled according to the comparison result of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space with the preset temperature range, including:

[0036] When the upper temperature T1 of the storage space is within the preset temperature range and the lower temperature T2 of the storage space exceeds the preset temperature range, comparing the lower temperature T2 of the storage space with the first preset temperature;

[0037] When the lower layer temperature T2 of the storage space is lower than the first preset temperature, the speed of the compressor is controlled to drop to PL, and the evaporation branch is controlled to maintain the first evaporation state;

[0038] When the temperature of the lower layer of the storage space is greater than or equal to the first preset temperature, the rotation speed of the compressor is controlled to maintain at the current rotation speed, and the evaporation branch is controlled to switch to the second evaporation state.

[0039] Furthermore, after controlling the speed of the compressor to drop to PL and controlling the evaporation branch to maintain the first evaporation state, the control method further includes:

[0040] When the lower temperature T2 of the storage space is less than or equal to the upper limit of the preset temperature range, controlling the speed of the compressor to increase to P0; and / or,

[0041] After controlling the speed of the compressor to maintain the current speed and controlling the evaporation branch to switch to the second evaporation state, the control method further includes:

[0042] When the lower temperature T2 of the storage space is less than or equal to the upper limit of the preset temperature range, the speed of the compressor is controlled to increase to P0, and the evaporation branch is controlled to switch to the first evaporation state.

[0043] Further, when at least one of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space is not within the preset temperature range, the operating state of the compressor of the refrigeration system and / or the connection state of the evaporation branch of the refrigeration system is controlled according to the comparison result of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space with the preset temperature range, including:

[0044] When the lower temperature T2 of the storage space is within the preset temperature range and the upper temperature T1 of the storage space exceeds the upper limit of the preset temperature range, the speed of the compressor is controlled to increase to PR, and the evaporation branch is controlled to maintain the first evaporation state;

[0045] When the upper temperature T1 of the storage space and the lower temperature T2 of the storage space both exceed the upper limit of the preset temperature range, the speed of the compressor is controlled to increase to PD, and the evaporation branch is controlled to maintain the first evaporation state.

[0046] Further, after controlling the speed of the compressor to increase to PR and controlling the evaporation branch to maintain the first evaporation state, the control method further includes: obtaining the lower temperature T2 of the storage space; when the lower temperature T2 of the storage space is less than the lower limit of the preset temperature range and the upper temperature T1 of the storage space is greater than the upper limit of the preset temperature range, controlling the speed of the compressor to continue to increase to PI; after the upper temperature T1 of the storage space is less than or equal to the upper limit of the preset temperature range, controlling the speed of the compressor to decrease to P0; and / or,

[0047] After controlling the speed of the compressor to increase to PD and controlling the evaporation branch to maintain the first evaporation state, the control method also includes: obtaining the lower temperature T2 of the storage space; when the lower temperature T2 of the storage space is less than or equal to the lower limit value of the preset temperature range and the upper temperature T1 of the storage space is greater than the upper limit value of the preset temperature range, controlling the speed of the compressor to increase to PI; when the upper temperature T1 of the storage space is less than or equal to the lower limit value of the preset temperature range and the lower temperature T2 of the storage space is greater than the upper limit value of the preset temperature range, controlling the evaporation branch to switch to the second evaporation state.

[0048] By applying the technical solution of the present invention, the evaporation state of the evaporation branch can be switched, so as to effectively improve the refrigeration state of the evaporation branch and adjust the refrigerant flowing through the evaporator corresponding to different positions of the cabinet, thereby making the refrigeration state of the evaporation branch more balanced, avoiding excessive temperature differences in the cabinet, and effectively ensuring the uniformity of temperature in the cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0050] Figure 1 A schematic structural diagram of a refrigeration system provided in an embodiment of the present invention is shown;

[0051] Figure 2 An angled schematic diagram of a storage box provided according to an embodiment of the present invention is shown;

[0052] Figure 3 Another angle schematic diagram of a storage box provided according to an embodiment of the present invention is shown;

[0053] Figure 4 A flow chart of a control method provided according to an embodiment of the present invention is shown.

[0054] The above drawings include the following reference numerals:

[0055] 10. Compressor; 20. Condenser;

[0056] 30. Evaporation branch; 31. First communication port; 32. Second communication port; 33. First evaporator; 34. Second evaporator;

[0057] 40. Switching structure; 41. First switching port; 42. Second switching port; 43. Third switching port; 44. Fourth switching port;

[0058] 50. Anti-condensation tube; 60. Throttling piece; 70. Dry filter;

[0059] 80. box; 81. storage space;

[0060] 90. Support frame;

[0061] 100. A first temperature detection component; 110. A second temperature detection component. DETAILED DESCRIPTION

[0062] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0063] like Figure 1 As shown, the first embodiment of the present invention provides a refrigeration system, which includes: a compressor 10, a condenser 20 and an evaporation branch 30, wherein the air outlet of the compressor 10 is connected to the inlet of the condenser 20. The evaporation branch 30 is used to refrigerate the storage space 81 of the box body 80 of the preservation box, and at least two evaporators arranged in series are arranged on the evaporation branch 30, and at least two evaporators are arranged on the box body 80 of the preservation box at intervals, and the evaporation branch 30 has a first connecting port 31 and a second connecting port 32. The evaporation branch 30 has a first evaporation state and a second evaporation state; when the evaporation branch 30 is in the first evaporation state, the first connecting port 31 is connected to the outlet of the condenser 20, and the second connecting port 32 is connected to the air inlet of the compressor 10; when the evaporation branch 30 is in the second evaporation state, the first connecting port 31 is connected to the air inlet of the compressor 10, and the second connecting port 32 is connected to the outlet of the condenser 20.

[0064] By using the refrigeration system provided in this embodiment, by switching the evaporation branch 30 to the first evaporation state or the second evaporation state, it is possible to effectively improve the refrigeration state of the evaporation branch 30, adjust the refrigerant flowing through the evaporator corresponding to different positions of the box 80, and thus adaptively adjust the temperature in the box 80, so that the refrigeration state of the evaporation branch 30 is more balanced, avoiding the situation of excessive temperature difference in the box 80, and thus facilitating the effective guarantee of the uniformity of the temperature in the box 80. Therefore, the refrigeration system provided in this embodiment solves the technical problem of poor temperature uniformity in the box 80 of the storage box in the prior art.

[0065] Specifically, the box body 80 mentioned in the present application can be understood as the storage space 81.

[0066] The refrigeration system provided in this embodiment can effectively avoid the temperature stratification phenomenon and is particularly suitable for medical treatment, scientific research and food preservation fields that require precise temperature control.

[0067] Specifically, the refrigeration system further includes a switching structure 40, the first connecting port 31, the second connecting port 32, the outlet of the condenser 20 and the air inlet of the compressor 10 are all connected to the switching structure 40, and the switching structure 40 has a first switching state and a second switching state; when the switching structure 40 is in the first switching state, the evaporation branch 30 is in the first evaporation state; when the switching structure 40 is in the second switching state, the evaporation branch 30 is in the second evaporation state. With such a structural setting, it is easy to smoothly switch the evaporation state of the evaporation branch 30, so as to adjust the flow direction of the evaporation branch 30, so as to change the temperature state of the heat exchange refrigerant flowing through at least two heat exchangers, so as to facilitate better and more flexible adaptive adjustment of the temperature of the box 80 corresponding to the corresponding evaporator, so as to avoid the situation where the local temperature of the box 80 is too high or too low, and effectively improve the temperature uniformity in the box 80.

[0068] In this embodiment, the switching structure 40 is a four-way valve, which has a first switching port 41 connected to the air inlet of the compressor 10, a second switching port 42 connected to the second connecting port 32, a third switching port 43 connected to the outlet of the condenser 20, and a fourth switching port 44 connected to the first connecting port 31; when the four-way valve is in the first switching state, the first switching port 41 is connected to the second switching port 42, and the third switching port 43 is connected to the fourth switching port 44; when the four-way valve is in the second switching state, the second switching port 42 is connected to the third switching port 43, and the first switching port 41 is connected to the fourth switching port 44. In this way, the structure is simple, and it is easy to smoothly switch the first switching state and the second switching state of the four-way valve, and smoothly adjust to the first evaporation state or the second evaporation state. The use of the four-way valve not only simplifies the structure of the refrigeration system, but also improves the response speed of the system, and is particularly suitable for occasions where rapid temperature adjustment is required, such as rapid cooling of emergency medical supplies.

[0069] Specifically, the refrigeration system further includes an anti-condensation pipe 50, one end of which is connected to the outlet of the condenser 20, and the other end of which is connected to the first communication port 31 or the second communication port 32. In this way, the anti-condensation pipe 50 can facilitate further condensation and improve the condensation effect.

[0070] Specifically, the refrigeration system further includes a throttling member 60, one end of which is connected to the outlet of the condenser 20, and the other end of which is connected to the first connecting port 31 or the second connecting port 32. In this way, throttling can be performed conveniently. Specifically, the throttling member 60 can be a capillary tube.

[0071] Specifically, the refrigeration system further includes a drying filter 70, one end of the drying filter 70 is communicated with the outlet of the condenser 20, and the other end of the drying filter 70 is communicated with the first communication port 31 or the second communication port 32. In this way, dry filtering can be performed conveniently.

[0072] In this embodiment, at least two evaporators are arranged at intervals along the height direction of the box body 80 of the preservation box. With such a structural arrangement, it is convenient to better adjust the temperature difference caused by the different heights of the preservation box, so as to ensure the temperature uniformity in the box body 80. Specifically, according to the distance that hot air rises and cold air falls, generally, if there is no adjustment, the temperature of the upper space of the storage space 81 will be higher than the lower space of the storage space 81. The height of the upper space is higher than that of the lower space. The refrigeration system provided by this embodiment can effectively solve the problem of temperature difference caused by height. By switching the first evaporation state and the second evaporation state of the refrigeration system, the temperature difference in the height direction of the preservation box can be effectively reduced, and the temperature uniformity can be improved.

[0073] Specifically, the at least two evaporators include a first evaporator 33 and a second evaporator 34 , and the first evaporator 33 is located above the second evaporator 34 .

[0074] like Figure 2 and 3 As shown, the second embodiment of the present invention provides a preservation box, which includes a box body 80 and the above-mentioned refrigeration system, and the box body 80 has a storage space 81. The evaporation branch 30 of the refrigeration system is arranged in the storage space 81 or in contact with the wall of the box body 80.

[0075] In this embodiment, the preservation box further includes a temperature detection member and a control member. The temperature detection member is disposed in the box body 80, and the temperature detection member is used to detect the temperature in the box body 80. The temperature detection member and the refrigeration system are both connected to the control member, and the control member controls the refrigeration system according to the detection result of the temperature detection member. In this way, the refrigeration system is controlled according to the detection condition of the temperature detection member, so as to switch the evaporation branch 30 to the first evaporation state or the second evaporation state accordingly.

[0076] Specifically, there are at least two temperature detection members, and the at least two temperature detection members are spaced apart along the height direction of the box body 80 , so as to detect the temperatures at different heights in the box body 80 (in the storage space 81 ).

[0077] Specifically, the at least two temperature sensing members include a first temperature sensing member 100 and a second temperature sensing member 110 , and the first temperature sensing member 100 is located above the second temperature sensing member 110 .

[0078] Specifically, the box body 80 includes a main body and a door, the door is movably arranged on the main body, and the temperature detection element is arranged on a side of the main body away from the door. Since the door may be opened or closed, the temperature at the door may be lower, so such an arrangement can improve the accuracy of temperature detection.

[0079] Specifically, the storage box further includes a plurality of support frames 90 , which are arranged at intervals in the storage space 81 to divide the storage space 81 into a plurality of storage sub-areas for convenient classified storage. Specifically, the plurality of support members are arranged at intervals along the height direction of the storage space 81 .

[0080] like Figure 4 As shown, the third embodiment of the present invention provides a control method, which is applicable to the above-mentioned preservation box, and the control method includes: obtaining the upper temperature T1 of the storage space 81 of the box body 80 of the preservation box and the lower temperature T2 of the storage space 81; according to the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81, controlling the operating state of the compressor 10 of the refrigeration system of the preservation box and / or the connection state of the evaporation branch 30 of the refrigeration system. This control method can intelligently adjust the working state of the refrigeration system to ensure the uniformity and stability of the temperature in the preservation box, and is applicable to occasions that require automatic temperature management, such as remote medical equipment and unattended scientific research experimental equipment.

[0081] In this embodiment, the operation state of the compressor 10 of the refrigeration system of the preservation box and / or the connection state of the evaporation branch 30 of the refrigeration system are controlled according to the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81, including: comparing the upper temperature T1 of the storage space 81 with the preset temperature range, and comparing the lower temperature T2 of the storage space 81 with the preset temperature range; according to the comparison result of the upper temperature T1 of the storage space 81 with the preset temperature range and the comparison result of the lower temperature T2 of the storage space 81 with the preset temperature range, the operation state of the compressor 10 of the refrigeration system and / or the connection state of the evaporation branch 30 of the refrigeration system are controlled. This precise temperature control strategy can effectively avoid temperature fluctuations and is suitable for scenes where a constant temperature needs to be maintained for a long time.

[0082] Specifically, the preset temperature range is [T0-t1, T0+t1], the upper limit value of the preset temperature range is T0+t1, and the lower limit value of the preset temperature range is T0-t1.

[0083] Specifically, when the evaporation branch 30 is in the first evaporation state, the refrigerant in the evaporation branch 30 flows from the evaporator located at the upper layer to the evaporator located at the lower layer; when the evaporation branch 30 is in the second evaporation state, the refrigerant in the evaporation branch 30 flows from the evaporator located at the lower layer to the evaporator located at the upper layer; according to the comparison result of the upper layer temperature T1 of the storage space 81 and the preset temperature range and the comparison result of the lower layer temperature T2 of the storage space 81 and the preset temperature range, the operating state of the compressor 10 of the refrigeration system and / or the connection state of the evaporation branch 30 of the refrigeration system are controlled, including: when When the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81 are both within the preset temperature range, the evaporation branch 30 is controlled to maintain in the first evaporation state, and the compressor 10 is controlled to maintain at the current speed; when at least one of the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81 is not within the preset temperature range, the operation state of the compressor 10 of the refrigeration system and / or the connection state of the evaporation branch 30 of the refrigeration system are controlled according to the comparison result between the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81 and the preset temperature range. This dynamic adjustment mechanism can respond quickly to temperature changes and is suitable for emergency situations where temperature needs to be adjusted quickly. In addition, by setting the first evaporation state, it can effectively ensure that the refrigerant flows through the evaporator located in the upper layer first and then flows through the evaporator in the lower layer, thereby effectively ensuring the heat exchange effect of the upper evaporator first, and cooling the temperature of the upper layer of the storage space 81 first, so as to avoid the situation where high temperature accumulates at a high place and causes a higher temperature in the upper layer.

[0084] Specifically, when at least one of the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81 is not within the preset temperature range, the operating state of the compressor 10 of the refrigeration system and / or the connectivity state of the evaporation branch 30 of the refrigeration system are controlled according to the comparison result of the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81 with the preset temperature range, including: when the upper temperature T1 of the storage space 81 is within the preset temperature range and the lower temperature T2 of the storage space 81 exceeds the preset temperature range, the lower temperature T2 of the storage space 81 is compared with the first preset temperature; when the lower temperature T2 of the storage space 81 is less than the first preset temperature, When the temperature of the lower layer of the storage space 81 reaches a preset temperature, the speed of the compressor 10 is controlled to drop to PL, and the evaporation branch 30 is controlled to maintain in the first evaporation state. At this time, the temperature of the refrigerant can basically meet the refrigeration demand of the evaporator located in the lower layer of the storage space. By reducing the speed, the residence speed of the refrigerant can be reduced, which is convenient for sufficient heat exchange and refrigeration. When the temperature of the lower layer of the storage space 81 is greater than or equal to the first preset temperature, the speed of the compressor 10 is controlled to maintain the current speed, and the evaporation branch 30 is controlled to switch to the second evaporation state. In this case, the temperature value of the lower layer is too large. By switching to the second evaporation state, the refrigerant is allowed to flow through the evaporator located in the lower layer first, so as to quickly improve the temperature of the lower layer. This control strategy can effectively avoid over-refrigeration, save energy, and is suitable for environments with strict requirements on energy consumption.

[0085] Specifically, the first preset temperature is T0+t2, and the first preset temperature is greater than an upper limit value of the preset temperature range.

[0086] Specifically, after controlling the speed of the compressor 10 to drop to PL and controlling the evaporation branch 30 to maintain the first evaporation state, the control method further includes: when the lower layer temperature T2 of the storage space 81 is less than or equal to the upper limit of the preset temperature range, controlling the speed of the compressor 10 to rise to P0. This control logic ensures the precise control of the temperature in the preservation box and also avoids the situation where the lower layer temperature continues to drop too much.

[0087] After controlling the speed of the compressor 10 to maintain the current speed and controlling the evaporation branch 30 to switch to the second evaporation state, the control method further includes: when the temperature T2 of the lower layer of the storage space 81 is less than or equal to the upper limit of the preset temperature range, controlling the speed of the compressor 10 to increase to P0 and controlling the evaporation branch 30 to switch to the first evaporation state. In this way, it is possible to avoid the situation where the temperature of the lower layer of the storage space 81 continues to drop too much, so as to achieve accurate control of the temperature of the lower layer.

[0088] Specifically, when at least one of the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81 is not within the preset temperature range, the operation state of the compressor 10 of the refrigeration system and / or the connection state of the evaporation branch 30 of the refrigeration system are controlled according to the comparison result between the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81 and the preset temperature range, including: when the lower temperature T2 of the storage space 81 is within the preset temperature range and the upper temperature T1 of the storage space 81 exceeds the upper limit of the preset temperature range, the speed of the compressor 10 is controlled to increase to PR, and the evaporation branch 30 is controlled to maintain in the first evaporation state; when the upper temperature T1 of the storage space 81 and the lower temperature T2 of the storage space 81 both exceed the upper limit of the preset temperature range, the speed of the compressor 10 is controlled to increase to PD, and the evaporation branch 30 is controlled to maintain in the first evaporation state. This control method can quickly respond to the increase of the upper temperature and is suitable for occasions requiring rapid cooling. The above state proves that the temperature of the refrigerant flowing through the evaporator located at the upper layer is not enough. At this time, by increasing the rotation speed of the compressor 10, the circulation of the refrigerant can be quickly improved, so as to quickly meet the cooling demand.

[0089] Specifically, after controlling the speed of the compressor 10 to increase to PR and controlling the evaporation branch 30 to maintain the first evaporation state, the control method further includes: obtaining the lower temperature T2 of the storage space 81; when the lower temperature T2 of the storage space 81 is less than the lower limit of the preset temperature range and the upper temperature T1 of the storage space 81 is greater than the upper limit of the preset temperature range, controlling the speed of the compressor 10 to continue to increase to PI; after the upper temperature T1 of the storage space 81 is less than or equal to the upper limit of the preset temperature range, controlling the speed of the compressor 10 to decrease to P0. This sophisticated control strategy can ensure accurate control of the temperature in the preservation box, is suitable for occasions where items need to be preserved under extreme temperature conditions, effectively avoids damage to items due to temperature fluctuations, and improves preservation efficiency and safety.

[0090] Specifically, “when the lower layer temperature T2 of the storage space 81 is less than the lower limit of the preset temperature range” can be understood as the lower layer temperature T2 has reached the shutdown point.

[0091] After controlling the speed of the compressor 10 to increase to PD and controlling the evaporation branch 30 to maintain the first evaporation state, the control method further includes: obtaining the lower temperature T2 of the storage space 81; when the lower temperature T2 of the storage space 81 is less than or equal to the lower limit of the preset temperature range and the upper temperature T1 of the storage space 81 is greater than the upper limit of the preset temperature range, controlling the speed of the compressor 10 to increase to PI; when the upper temperature T1 of the storage space 81 is less than or equal to the lower limit of the preset temperature range and the lower temperature T2 of the storage space 81 is greater than the upper limit of the preset temperature range, controlling the evaporation branch 30 to switch to the second evaporation state. This sophisticated control strategy can ensure accurate control of the temperature in the preservation box, and is suitable for occasions where items need to be preserved under extreme temperature conditions, such as sample preservation at polar research stations and drug storage in tropical areas, effectively avoiding damage to items due to temperature fluctuations and improving preservation efficiency and safety.

[0092] Specifically, “when the upper temperature T1 of the storage space 81 is less than or equal to the lower limit of the preset temperature range” can be understood as the upper temperature T1 has reached the shutdown point.

[0093] Specifically, the storage box in this application is a low-temperature storage box. Figure 3 The box body is divided into two upper and lower layer structures in the up and down directions (as shown in the figure), and two temperature sensors (a first temperature detection component 100 and a second temperature detection component 110) are arranged on the upper and lower surfaces of the inner rear wall of the box body. The temperatures detected by the two temperature sensors are T1 (corresponding to the temperature value detected by the first temperature detection component 100) and T2 (corresponding to the temperature value detected by the second temperature detection component 110).

[0094] like Figure 4As shown, the low-temperature preservation box is powered on, the temperature is set to T0, the compressor runs at a speed P0, and the initial state of the four-way valve is the ab connection state (the ab connection state corresponds to the state where the first switching port 41 and the second switching port 42 are connected). Detect the upper temperature T1 and the lower temperature T2 of the box, and determine whether the upper temperature T1 and the lower temperature T2∈[T0-t1, T0+t1]. If so, maintain the current compressor speed and the four-way valve connection state; if not, determine whether the upper temperature T1∈[T0-t1, T0+t1] and the lower temperature T2>T0+t1. If so, further determine whether T0+t1<T2<T0+t2. If so, the compressor speed is reduced to PL and the four-way valve connection state remains unchanged, and the target speed is increased to P0 when the lower temperature T2≤T0+t1; if not, the compressor speed remains unchanged, and the four-way valve is turned to the bc connection state (the bc connection state corresponds to the state where the second switching port 42 is connected to the third switching port 43), and when the lower temperature T2 is operated to T0+t1, the four-way valve is turned to the ab connection state again. If the upper temperature T1∈[T0-t1, T0+t1] and the lower temperature T2>T0+t1 are not true, then determine whether the lower temperature T2∈[T0-t1, T0+t1] and the upper temperature T1>T0+t1. If so, the compressor speed is increased to PR, and the four-way valve connection state remains unchanged. If the lower temperature T2 has reached the shutdown point and the upper temperature T1 is still greater than T0+t1, the speed can be further increased to PI. When the upper temperature T1≤T0+t1, the target speed is changed to P0. If not, then at this time T1 and T2 are both greater than T0+t1, the compressor speed increases to PD, and the four-way valve connection state remains unchanged. If the lower layer temperature T2 has reached the shutdown point and the upper layer temperature T1 is still greater than T0+t1, the speed can be further increased to PI, and then, when the upper layer temperature T1≤T0+t1, the target speed is increased to P0; if the upper layer temperature T1 has reached the shutdown point and the lower layer temperature T2 is still greater than T0+t1, the four-way valve is turned to the bc connection state, and then, until the lower layer temperature T2 drops below T0+t1, the compressor speed is turned to P0, and the four-way valve is turned to the ab connection state.

[0095] Specifically, PL<P0, PR>P0, PD>P0, PI>P0.

[0096] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: it can quickly cool down, accurately control the temperature, maintain a high temperature uniformity and temperature stability in the box, and avoid unnecessary energy waste, so as to achieve a high storage quality. By optimizing the layout of the evaporator and dynamically adjusting the operating state of the compressor 10, the uniform and stable control of the temperature in the preservation box is achieved, which is particularly suitable for the medical, scientific research and food preservation fields that require precise temperature control. At the same time, through the intelligent control strategy, the system can quickly adjust the speed of the compressor 10 and the control of the switching structure 40 according to the temperature changes at different heights in the preservation box, effectively avoiding over-refrigeration and temperature stratification, improving energy utilization efficiency, reducing operating costs, and providing reliable guarantees for the long-term stable preservation of items. In addition, the system also has functions such as anti-condensation, throttling and drying filtration, which further enhances its adaptability and stability in complex environments, and has broad application prospects and practical value.

[0097] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0098] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0099] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0100] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0101] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A refrigeration system, characterized in that: include: A compressor (10) and a condenser (20), wherein an air outlet of the compressor (10) is in communication with an inlet of the condenser (20); An evaporation branch (30), the evaporation branch (30) being used to refrigerate a storage space (81) of a box body (80) of a preservation box, the evaporation branch (30) being provided with at least two evaporators arranged in series, at least two of the evaporators being arranged at intervals on the box body (80) of the preservation box, the evaporation branch (30) having a first communication port (31) and a second communication port (32); The evaporation branch (30) has a first evaporation state and a second evaporation state; when the evaporation branch (30) is in the first evaporation state, the first connecting port (31) is connected to the outlet of the condenser (20), and the second connecting port (32) is connected to the air inlet of the compressor (10); when the evaporation branch (30) is in the second evaporation state, the first connecting port (31) is connected to the air inlet of the compressor (10), and the second connecting port (32) is connected to the outlet of the condenser (20).

2. The refrigeration system according to claim 1, characterized in that: The refrigeration system further comprises: A switching structure (40), wherein the first connecting port (31), the second connecting port (32), the outlet of the condenser (20) and the air inlet of the compressor (10) are all connected to the switching structure (40), and the switching structure (40) has a first switching state and a second switching state; when the switching structure (40) is in the first switching state, the evaporation branch (30) is in the first evaporation state; when the switching structure (40) is in the second switching state, the evaporation branch (30) is in the second evaporation state.

3. The refrigeration system according to claim 2, characterized in that: The switching structure (40) is a four-way valve, which has a first switching port (41) connected to the air inlet of the compressor (10), a second switching port (42) connected to the second connecting port (32), a third switching port (43) connected to the outlet of the condenser (20), and a fourth switching port (44) connected to the first connecting port (31); when the four-way valve is in the first switching state, the first switching port (41) is connected to the second switching port (42), and the third switching port (43) is connected to the fourth switching port (44); when the four-way valve is in the second switching state, the second switching port (42) is connected to the third switching port (43), and the first switching port (41) is connected to the fourth switching port (44).

4. The refrigeration system according to claim 2, characterized in that: The refrigeration system further comprises: an anti-condensation tube (50), one end of the anti-condensation tube (50) being connected to the outlet of the condenser (20), and the other end of the anti-condensation tube (50) being connected to the first communication port (31) or the second communication port (32); and / or, a throttling member (60), one end of the throttling member (60) being in communication with the outlet of the condenser (20), and the other end of the throttling member (60) being in communication with the first communication port (31) or the second communication port (32); and / or, A drying filter (70), one end of the drying filter (70) is connected to the outlet of the condenser (20), and the other end of the drying filter (70) is connected to the first communication port (31) or the second communication port (32).

5. The refrigeration system according to any one of claims 1 to 4, characterized in that: At least two of the evaporators are arranged at intervals along the height direction of the box body (80) of the preservation box.

6. A storage box, characterized in that: include: A box (80), wherein the box (80) has a storage space (81); The refrigeration system according to any one of claims 1 to 5, wherein the evaporation branch (30) of the refrigeration system is arranged in the storage space (81) or in contact with the wall surface of the box body (80).

7. The storage box according to claim 6, characterized in that: The storage box also includes: a temperature detection element, disposed in the box (80), the temperature detection element being used to detect the temperature in the box (80); A control component, the temperature detection component and the refrigeration system are both connected to the control component, and the control component controls the refrigeration system according to the detection result of the temperature detection component.

8. The storage box according to claim 7, characterized in that: There are at least two temperature detection members, and the at least two temperature detection members are arranged at intervals along the height direction of the box body (80); and / or, The box body (80) comprises a main body and a box door, the box door is movably arranged on the main body, and the temperature detection element is arranged on a side of the main body away from the box door; and / or, The storage box further comprises a plurality of support frames (90), and the plurality of support frames (90) are arranged at intervals in the storage space (81).

9. A control method, characterized in that: The control method is applicable to the storage box according to any one of claims 6 to 8, and the control method comprises: Obtaining the upper temperature T1 of the storage space of the preservation box and the lower temperature T2 of the storage space; According to the upper temperature T1 of the storage space and the lower temperature T2 of the storage space, the operating state of the compressor of the refrigeration system of the preservation box and / or the connection state of the evaporation branch of the refrigeration system are controlled.

10. The control method according to claim 9, characterized in that: The controlling of the operating state of the compressor of the refrigeration system of the preservation box and / or the connection state of the evaporation branch of the refrigeration system according to the upper temperature T1 of the storage space and the lower temperature T2 of the storage space includes: Comparing the upper temperature T1 of the storage space with a preset temperature range, and comparing the lower temperature T2 of the storage space with the preset temperature range; The operating state of the compressor of the refrigeration system and / or the connectivity state of the evaporation branch of the refrigeration system are controlled according to the comparison result between the upper temperature T1 of the storage space and the preset temperature range and the comparison result between the lower temperature T2 of the storage space and the preset temperature range.

11. The control method according to claim 10, characterized in that: When the evaporation branch is in the first evaporation state, the refrigerant in the evaporation branch flows from the evaporator located at the upper layer to the evaporator located at the lower layer; when the evaporation branch is in the second evaporation state, the refrigerant in the evaporation branch flows from the evaporator located at the lower layer to the evaporator located at the upper layer; the operation state of the compressor of the refrigeration system and / or the connection state of the evaporation branch of the refrigeration system are controlled according to the comparison result of the upper temperature T1 of the storage space and the preset temperature range and the comparison result of the lower temperature T2 of the storage space and the preset temperature range, including: When the upper temperature T1 of the storage space and the lower temperature T2 of the storage space are both within the preset temperature range, the evaporation branch is controlled to be maintained in the first evaporation state, and the compressor is controlled to be maintained at the current speed; When at least one of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space is not within the preset temperature range, the operating state of the compressor of the refrigeration system and / or the connectivity state of the evaporation branch of the refrigeration system is controlled based on the comparison result of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space with the preset temperature range.

12. The control method according to claim 11, characterized in that: When at least one of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space is not within the preset temperature range, controlling the operating state of the compressor of the refrigeration system and / or the connection state of the evaporation branch of the refrigeration system according to the comparison result between the upper temperature T1 of the storage space and the lower temperature T2 of the storage space and the preset temperature range includes: When the upper temperature T1 of the storage space is within the preset temperature range and the lower temperature T2 of the storage space exceeds the preset temperature range, comparing the lower temperature T2 of the storage space with the first preset temperature; When the lower layer temperature T2 of the storage space is lower than the first preset temperature, the speed of the compressor is controlled to drop to PL, and the evaporation branch is controlled to maintain the first evaporation state; When the temperature of the lower layer of the storage space is greater than or equal to the first preset temperature, the rotation speed of the compressor is controlled to maintain at the current rotation speed, and the evaporation branch is controlled to switch to the second evaporation state.

13. The control method according to claim 12, characterized in that: After controlling the speed of the compressor to drop to PL and controlling the evaporation branch to maintain the first evaporation state, the control method further includes: When the lower temperature T2 of the storage space is less than or equal to the upper limit of the preset temperature range, controlling the speed of the compressor to increase to P0; and / or, After controlling the speed of the compressor to maintain the current speed and controlling the evaporation branch to switch to the second evaporation state, the control method further includes: When the lower temperature T2 of the storage space is less than or equal to the upper limit of the preset temperature range, the speed of the compressor is controlled to increase to P0, and the evaporation branch is controlled to switch to the first evaporation state.

14. The control method according to claim 11, characterized in that: When at least one of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space is not within the preset temperature range, the operating state of the compressor of the refrigeration system and / or the connection state of the evaporation branch of the refrigeration system are controlled according to the comparison result of the upper temperature T1 of the storage space and the lower temperature T2 of the storage space with the preset temperature range, including: When the lower temperature T2 of the storage space is within the preset temperature range and the upper temperature T1 of the storage space exceeds the upper limit of the preset temperature range, the speed of the compressor is controlled to increase to PR, and the evaporation branch is controlled to maintain the first evaporation state; When the upper temperature T1 of the storage space and the lower temperature T2 of the storage space both exceed the upper limit of the preset temperature range, the speed of the compressor is controlled to increase to PD, and the evaporation branch is controlled to maintain the first evaporation state.

15. The control method according to claim 14, characterized in that: After controlling the speed of the compressor to increase to PR and controlling the evaporation branch to maintain the first evaporation state, the control method further includes: obtaining the lower temperature T2 of the storage space; when the lower temperature T2 of the storage space is less than the lower limit of the preset temperature range and the upper temperature T1 of the storage space is greater than the upper limit of the preset temperature range, controlling the speed of the compressor to continue to increase to PI; after the upper temperature T1 of the storage space is less than or equal to the upper limit of the preset temperature range, controlling the speed of the compressor to decrease to P0; and / or, After controlling the speed of the compressor to increase to PD and controlling the evaporation branch to maintain the first evaporation state, the control method also includes: obtaining the lower temperature T2 of the storage space; when the lower temperature T2 of the storage space is less than or equal to the lower limit value of the preset temperature range and the upper temperature T1 of the storage space is greater than the upper limit value of the preset temperature range, controlling the speed of the compressor to increase to PI; when the upper temperature T1 of the storage space is less than or equal to the lower limit value of the preset temperature range and the lower temperature T2 of the storage space is greater than the upper limit value of the preset temperature range, controlling the evaporation branch to switch to the second evaporation state.

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