Refrigeration system, holding case, and control method

Abstract

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

Description

TECHNICAL FIELD

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

[0002] At present, medical low-temperature preservation boxes are mainly used for storing cells, tissues, viruses, fertilized eggs, clinical samples and other biological samples with important value, and the storage quality requirements are extremely high. Temperature stability and uniformity of the temperature in the box are two important factors affecting the storage quality of the samples.

[0003] However, the low-temperature preservation boxes in the prior art usually adopt direct cooling refrigeration, and the box volume is large, which often causes the temperature at different positions in the preservation box to differ greatly, thereby causing poor uniformity of the box temperature and affecting the low-temperature preservation effect of the preservation box. SUMMARY

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

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a refrigeration system is provided, comprising:

[0006] A compressor and a condenser, wherein the gas outlet of the compressor is in communication with the inlet of the condenser;

[0007] An evaporation branch, wherein the evaporation branch is used for refrigerating the storage space of the box body of the preservation box, at least two evaporators arranged in series are arranged on the evaporation branch, and the at least two evaporators are arranged at intervals on the box body of the preservation box, 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 communication port is in communication with the outlet of the condenser, and the second communication port is in communication with the gas inlet of the compressor; when the evaporation branch is in the second evaporation state, the first communication port is in communication with the gas inlet of the compressor, and the second communication port is in communication with the outlet of the condenser.

[0009] Further, the refrigeration system further comprises:

[0010] A switching structure, the first communication port, the second communication port, the outlet of the condenser and the gas inlet of the compressor are connected with the switching structure, 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, the four-way valve has a first switching port in communication with the gas inlet of the compressor, a second switching port in communication with the second communication port, a third switching port in communication with the outlet of the condenser, and a fourth switching port in communication with the first communication port; when the four-way valve is in the first switching state, the first switching port is in communication with the second switching port, and the third switching port is in communication with the fourth switching port; when the four-way valve is in the second switching state, the second switching port is in communication with the third switching port, and the first switching port is in communication with the fourth switching port.

[0012] Further, the refrigeration system further comprises:

[0013] A condensation prevention pipe, one end of the condensation prevention pipe is in communication with the outlet of the condenser, and the other end of the condensation prevention pipe is in communication with the first communication port or the second communication port; and / or,

[0014] A throttling element, one end of the throttling element is in communication with the outlet of the condenser, and the other end of the throttling element is in communication with the first communication port or the second communication port; and / or,

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

[0016] Further, at least two of the evaporators are arranged at intervals along the height direction of the cabinet of the storage box.

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

[0018] A cabinet, the cabinet has a storage space;

[0019] The above-provided refrigeration system, the evaporation branch of the refrigeration system is arranged in the storage space or in contact with the wall surface of the cabinet.

[0020] Further, the storage box further comprises:

[0021] A temperature detection element arranged in the cabinet, the temperature detection element is used for detecting the temperature in the cabinet;

[0022] A control member, the temperature detecting member and the refrigeration system are connected with the control member, and the control member controls the refrigeration system according to the result detected by the temperature detecting member.

[0023] Further, the temperature detecting member is at least two, and the at least two temperature detecting members are arranged at intervals along the height direction of the box body; and / or,

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

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

[0026] According to another aspect of the present application, a control method is provided, which is suitable for the above-mentioned storage box, and the control method comprises:

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

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

[0029] Further, according to the upper layer temperature T1 of the storage space and the lower layer temperature T2 of the storage space, the running state of the compressor of the refrigeration system of the storage box and / or the communication state of the evaporation branch of the refrigeration system are controlled, which comprises:

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

[0031] According to the comparison result of the upper layer temperature T1 of the storage space with the preset temperature range and the comparison result of the lower layer temperature T2 of the storage space with the preset temperature range, the running state of the compressor of the refrigeration system and / or the communication state of the evaporation branch of the refrigeration system are controlled.

[0032] Further, when the evaporation branch is in the first evaporation state, the refrigerant of the evaporation branch flows from the upper evaporation device to the lower evaporation device; when the evaporation branch is in the second evaporation state, the refrigerant of the evaporation branch flows from the lower evaporation device to the upper evaporation device; and the control of the operating state of the compressor and / or the connection state of the evaporation branch of the refrigeration system according to the comparison results of the upper temperature T1 of the storage space and the preset temperature range and the comparison results of the lower temperature T2 of the storage space and the preset temperature range comprises:

[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 maintain the first evaporation state, and the compressor is controlled to maintain 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 and / or the connection state of the evaporation branch of the refrigeration system is controlled according to the comparison results of the upper temperature T1 of the storage space and the preset temperature range and the comparison results of the lower temperature T2 of the storage space and 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 and / or the connection state of the evaporation branch of the refrigeration system is controlled according to the comparison results of the upper temperature T1 of the storage space and the preset temperature range and the comparison results of the lower temperature T2 of the storage space and the preset temperature range.

[0036] In the case that 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, the lower temperature T2 of the storage space is compared with a first preset temperature;

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

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

[0039] Further, after the control of the speed of the compressor to decrease to PL and the control of the evaporation branch to maintain the first evaporation state, the control method further comprises:

[0040] when the lower layer temperature T2 of the storage space is less than or equal to the upper limit value of the preset temperature range, the speed of the compressor is controlled to rise to P0; and / or,

[0041] after the control of maintaining the speed of the compressor at the current speed, the control method further comprises:

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

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

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

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

[0046] Further, after the control of rising the speed of the compressor to PR and maintaining the evaporation branch in the first evaporation state, the control method further comprises: acquiring the lower layer temperature T2 of the storage space; when the lower layer temperature T2 of the storage space is less than the lower limit value of the preset temperature range and the upper layer temperature T1 of the storage space is greater than the upper limit value of the preset temperature range, the speed of the compressor is controlled to continue to rise to PI; after the upper layer temperature T1 of the storage space is less than or equal to the upper limit value of the preset temperature range, the speed of the compressor is controlled to decrease to P0; and / or,

[0047] After the control of the speed of the compressor to be raised to PD and the control of the evaporation branch to be maintained in the first evaporation state, the control method further comprises: obtaining the lower layer temperature T2 of the storage space; when the lower layer temperature T2 of the storage space is less than or equal to the lower limit value of the preset temperature range and the upper layer temperature T1 of the storage space is greater than the upper limit value of the preset temperature range, the speed of the compressor is controlled to be raised to PI; when the upper layer temperature T1 of the storage space is less than or equal to the lower limit value of the preset temperature range and the lower layer temperature T2 of the storage space is greater than the upper limit value of the preset temperature range, the evaporation branch is controlled to be switched to the second evaporation state.

[0048] The technical scheme of the present application can effectively improve the refrigeration state of the evaporation branch by switching the evaporation state of the evaporation branch, adjust the refrigerant flowing to the evaporator corresponding to different positions of the cabinet, so that the refrigeration state of the evaporation branch is more balanced, and the case of excessive temperature difference in the cabinet is avoided, thereby effectively ensuring the uniformity of the temperature in the cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0049] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0050] Figure 1 A structural schematic diagram of a refrigeration system according to an embodiment of the present application is shown;

[0051] Figure 2 Another angle schematic diagram of a storage cabinet according to an embodiment of the present application is shown;

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

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

[0054] Among the above drawings, the following reference signs are included:

[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 pipe; 60. Throttling device; 70. Dryer filter;

[0059] 80. Box body; 81. Storage space;

[0060] 90. Support frame;

[0061] 100. First temperature detection element; 110. Second temperature detection element. Detailed Implementation

[0062] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0063] like Figure 1 As shown, Embodiment 1 of the present invention provides a refrigeration system comprising: a compressor 10, a condenser 20, and an evaporation branch 30. The 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 storage box 80. At least two evaporators are arranged in series on the evaporation branch 30, and the at least two evaporators are spaced apart on the storage box 80. The evaporation branch 30 has a first connection port 31 and a second connection 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 connection port 31 is connected to the outlet of the condenser 20, and the second connection port 32 is connected to the inlet of the compressor 10. When the evaporation branch 30 is in the second evaporation state, the first connection port 31 is connected to the inlet of the compressor 10, and the second connection port 32 is connected to the outlet of the condenser 20.

[0064] The refrigeration system provided in this embodiment, by switching the evaporation branch 30 to either the first or second evaporation state, effectively improves the refrigeration state of the evaporation branch 30 and adjusts the refrigerant flow to the evaporators corresponding to different positions within the cabinet 80. This adaptively regulates the temperature within the cabinet 80, resulting in a more balanced refrigeration state of the evaporation branch 30 and preventing excessive temperature differences within the cabinet 80. Consequently, it effectively ensures temperature uniformity within the cabinet 80. Therefore, the refrigeration system provided in this embodiment solves the technical problem of poor temperature uniformity within the cabinet 80 of existing storage boxes.

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

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

[0067] Specifically, the refrigeration system further comprises a switching structure 40, the first communication port 31, the second communication port 32, the outlet of the condenser 20 and the gas inlet of the compressor 10 are all connected with the switching structure 40, 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 structure, the evaporation state of the evaporation branch 30 can be switched smoothly, so that the flow direction of the evaporation branch 30 can be adjusted to change the temperature state of the heat exchange refrigerant flowing into the at least two heat exchangers, thereby facilitating better and more flexible adaptive adjustment of the temperature of the cabinet 80 corresponding to the corresponding evaporator, thereby avoiding the situation that the temperature of the cabinet 80 is too high or too low in some areas, and effectively improving the temperature uniformity in the cabinet 80.

[0068] In the present embodiment, the switching structure 40 is a four-way valve, the four-way valve has a first switching port 41 in communication with the gas inlet of the compressor 10, a second switching port 42 in communication with the second communication port 32, a third switching port 43 in communication with the outlet of the condenser 20, and a fourth switching port 44 in communication with the first communication port 31; when the four-way valve is in the first switching state, the first switching port 41 and the second switching port 42 are in communication, and the third switching port 43 and the fourth switching port 44 are in communication; when the four-way valve is in the second switching state, the second switching port 42 and the third switching port 43 are in communication, and the first switching port 41 and the fourth switching port 44 are in communication. In this way, the structure is simple, and the first switching state and the second switching state of the four-way valve can be switched smoothly to 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 that require rapid temperature adjustment, such as rapid cooling of emergency medical supplies.

[0069] Specifically, the refrigeration system further comprises an anti-condensation pipe 50, one end of the anti-condensation pipe 50 is in communication with the outlet of the condenser 20, and the other end of the anti-condensation pipe 50 is in communication with the first communication port 31 or the second communication port 32. In this way, further condensation can be facilitated through the anti-condensation pipe 50 to improve the condensation effect.

[0070] Specifically, the refrigeration system further comprises a throttling member 60, one end of the throttling member 60 is in communication with the outlet of the condenser 20, and the other end of the throttling member 60 is in communication with the first communication port 31 or the second communication port 32. In this way, throttling can be facilitated. Specifically, the throttling member 60 can be a capillary tube.

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

[0072] In this embodiment, at least two evaporators are spaced apart along the height of the storage box 80. This structural arrangement facilitates better adjustment of temperature differences caused by variations in the height of the storage box, thereby ensuring temperature uniformity within the box 80. Specifically, based on the principle that hot air rises and cold air sinks, without adjustment, the temperature of the upper space of the storage space 81 will generally be higher than that of the lower space. The upper space is higher than the lower space. However, the refrigeration system provided in this embodiment effectively solves the temperature difference caused by height. By switching between the first and second evaporation states of the refrigeration system, the temperature difference in the height direction of the storage box is effectively reduced, improving temperature uniformity.

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

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

[0075] In this embodiment, the storage box further includes a temperature detection device and a control device. The temperature detection device is disposed inside the box body 80 and is used to detect the temperature inside the box body 80. Both the temperature detection device and the refrigeration system are connected to the control device, which controls the refrigeration system based on the detection result of the temperature detection device. This allows the refrigeration system to be controlled according to the detection status of the temperature detection device, 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 sensors, which are spaced apart along the height of the enclosure 80 to facilitate the detection of the temperature at different heights within the enclosure 80 (storage space 81).

[0077] Specifically, at least two temperature sensing elements include a first temperature sensing element 100 and a second temperature sensing element 110, with the first temperature sensing element 100 located above the second temperature sensing element 110.

[0078] Specifically, the enclosure 80 includes a main body and a door, with the door movably mounted on the main body. The temperature sensing element is located on the 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; therefore, this arrangement improves the accuracy of temperature detection.

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

[0080] As shown in Figure 4 Embodiment three of the present application provides a control method, which is applicable to the above-mentioned storage box and comprises the following steps: obtaining the upper-layer temperature T1 of the storage space 81 of the box body 80 of the storage box and the lower-layer temperature T2 of the storage space 81; and controlling the running state of the compressor 10 of the refrigeration system of the storage box and / or the communication state of the evaporation branch 30 of the refrigeration system according to the upper-layer temperature T1 of the storage space 81 and the lower-layer temperature T2 of the storage space 81. This control method can intelligently adjust the working state of the refrigeration system, ensure the uniformity and stability of the temperature in the storage box, and is suitable for occasions that require automatic temperature management, such as remote medical equipment and unattended scientific research equipment.

[0081] In this embodiment, the control of the running state of the compressor 10 of the refrigeration system of the storage box and / or the communication state of the evaporation branch 30 of the refrigeration system according to the upper-layer temperature T1 of the storage space 81 and the lower-layer temperature T2 of the storage space 81 comprises the following steps: comparing the upper-layer temperature T1 of the storage space 81 with a preset temperature range and comparing the lower-layer temperature T2 of the storage space 81 with the preset temperature range; and controlling the running state of the compressor 10 of the refrigeration system and / or the communication state of the evaporation branch 30 of the refrigeration system according to the comparison results of the upper-layer temperature T1 of the storage space 81 and the preset temperature range and the comparison results of the lower-layer temperature T2 of the storage space 81 and the preset temperature range. This precise temperature control strategy can effectively avoid temperature fluctuations and is suitable for scenarios that require constant temperature 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 of the evaporation branch 30 is caused to flow from the upper-layer evaporator to the lower-layer evaporator; when the evaporation branch 30 is in the second evaporation state, the refrigerant of the evaporation branch 30 is caused to flow from the lower-layer evaporator to the upper-layer evaporator; 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 according to the comparison results of the upper-layer temperature T1 of the storage space 81 and the preset temperature range and the comparison results of the lower-layer temperature T2 of the storage space 81 and the preset temperature range, including: when the upper-layer temperature T1 of the storage space 81 and the lower-layer temperature T2 of the storage space 81 are both within the preset temperature range, the evaporation branch 30 is controlled to maintain the first evaporation state, and the compressor 10 is controlled to maintain the current rotating speed; when at least one of the upper-layer temperature T1 of the storage space 81 and the lower-layer 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 connection state of the evaporation branch 30 of the refrigeration system are controlled according to the comparison results of the upper-layer temperature T1 of the storage space 81 and the preset temperature range and the comparison results of the lower-layer temperature T2 of the storage space 81 and the preset temperature range. This dynamic adjustment mechanism can quickly respond to temperature changes and is suitable for emergency situations that require rapid temperature adjustment. In addition, through the setting of the first evaporation state, the refrigerant can be effectively caused to flow through the upper-layer evaporator first and then through the lower-layer evaporator, thereby effectively ensuring the heat exchange effect of the upper-layer evaporator first and preferentially reducing the temperature of the upper layer of the storage space 81, avoiding the situation that high temperature gathers at a high place and causes the upper-layer temperature to be relatively high.

[0084] Specifically, when at least one of the upper layer temperature T1 of the storage space 81 and the lower layer temperature T2 of the storage space 81 is not within the preset temperature range, the control of the operating state of the compressor 10 of the refrigeration system and / or the communication state of the evaporation branch 30 of the refrigeration system according to the comparison result of the upper layer temperature T1 of the storage space 81 and the lower layer temperature T2 of the storage space 81 with the preset temperature range includes: in the case that the upper layer temperature T1 of the storage space 81 is within the preset temperature range and the lower layer temperature T2 of the storage space 81 is out of the preset temperature range, comparing the lower layer temperature T2 of the storage space 81 with the first preset temperature; when the lower layer temperature T2 of the storage space 81 is less than the first preset temperature, controlling the rotating speed of the compressor 10 to drop to PL and controlling the evaporation branch 30 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, and by reducing the rotating speed, the residence speed of the refrigerant can be reduced to facilitate sufficient heat exchange refrigeration; when the lower layer temperature of the storage space 81 is greater than or equal to the first preset temperature, controlling the rotating speed of the compressor 10 to maintain at the current rotating speed and controlling the evaporation branch 30 to switch to the second evaporation state, in this case, the temperature value of the lower layer temperature is too large, and by switching to the second evaporation state, the refrigerant is preferentially flowed through the evaporator located in the lower layer, thereby facilitating rapid improvement of the temperature of the lower layer. This control strategy can effectively avoid excessive refrigeration and 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 the upper limit value of the preset temperature range.

[0086] Specifically, after controlling the rotating speed of the compressor 10 to drop to PL and controlling the evaporation branch 30 to maintain in 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 value of the preset temperature range, controlling the rotating speed of the compressor 10 to rise to P0. This control logic ensures accurate control of the temperature in the storage box and avoids the case that the lower layer temperature continues to drop too much.

[0087] After controlling the rotating speed of the compressor 10 to maintain at the current rotating speed and controlling the evaporation branch 30 to switch to the second 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 value of the preset temperature range, controlling the rotating speed of the compressor 10 to rise to P0 and controlling the evaporation branch 30 to switch to the first evaporation state. In this way, the case that the lower layer temperature of the storage space 81 continues to drop too much can be avoided to achieve accurate control of the lower layer temperature.

[0088] Specifically, when at least one of the upper layer temperature T1 of the storage space 81 and the lower layer 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 communication state of the evaporation branch 30 of the refrigeration system are controlled according to the comparison results of the upper layer temperature T1 of the storage space 81 and the lower layer temperature T2 of the storage space 81 with the preset temperature range, including: when the lower layer temperature T2 of the storage space 81 is within the preset temperature range, and the upper layer temperature T1 of the storage space 81 exceeds the upper limit value of the preset temperature range, the speed of the compressor 10 is controlled to be increased to PR, and the evaporation branch 30 is controlled to be maintained in the first evaporation state; when the upper layer temperature T1 of the storage space 81 and the lower layer temperature T2 of the storage space 81 both exceed the upper limit value of the preset temperature range, the speed of the compressor 10 is controlled to be increased to PD, and the evaporation branch 30 is controlled to be maintained in the first evaporation state. This control mode can quickly respond to the increase of the upper layer temperature, and is suitable for occasions that require rapid cooling. The above state proves that the temperature of the refrigerant flowing through the evaporator located in the upper layer is also insufficient, at this time, by increasing the speed of the compressor 10, the circulation of the refrigerant can be quickly improved, and the refrigeration demand can be quickly met.

[0089] Specifically, after the speed of the compressor 10 is controlled to be increased to PR and the evaporation branch 30 is controlled to be maintained in the first evaporation state, the control method further includes: obtaining the lower layer temperature T2 of the storage space 81; when the lower layer temperature T2 of the storage space 81 is less than the lower limit value of the preset temperature range, and the upper layer temperature T1 of the storage space 81 is greater than the upper limit value of the preset temperature range, the speed of the compressor 10 is controlled to continue to increase to PI; after the upper layer temperature T1 of the storage space 81 is less than or equal to the upper limit value of the preset temperature range, the speed of the compressor 10 is controlled to be reduced to P0. This fine control strategy can ensure accurate control of the temperature in the preservation box, and is suitable for occasions that require preservation of articles under extreme temperature conditions, effectively avoiding damage to the articles due to temperature fluctuations, and improving preservation efficiency and safety.

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

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

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

[0093] Specifically, the storage box in the present application is a low-temperature storage box. The storage box is divided into an upper layer and a lower layer in the vertical direction (i.e., the height direction, such as the up-down direction shown in the figure). Figure 3 Two temperature sensors (a first temperature detection member 100 and a second temperature detection member 110) are arranged on the inner back wall of the box body, and the temperatures detected by the two temperature sensors are T1 (corresponding to the temperature value detected by the first temperature detection member 100) and T2 (corresponding to the temperature value detected by the second temperature detection member 110).

[0094] As shown in Figure 4As shown, the low-temperature storage box is powered on, the temperature is set to T0, the compressor is operated at a speed P0, and the four-way valve is initially in the ab communication state (the ab communication state corresponds to a state in which the first switching port 41 and the second switching port 42 are communicated). The upper layer temperature T1 and the lower layer temperature T2 of the box body are detected, and it is determined whether the upper layer temperature T1 and the lower layer temperature T2 are in the range of [T0-t1, T0+t1]. If yes, the current compressor speed and the four-way valve communication state are maintained; if no, it is determined whether the upper layer temperature T1 is in the range of [T0-t1, T0+t1] and the lower layer temperature T2 is greater than T0+t1. If yes, it is further determined whether T0+t1

[0095] Specifically, PL

[0096] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: rapid cooling, precise temperature control, maintaining high uniformity and stability of the temperature in the box, avoiding unnecessary energy waste, and achieving high storage quality. By optimizing the layout of the evaporator and dynamically adjusting the operating state of the compressor 10, uniform and stable control of the temperature in the storage box is achieved, which is particularly suitable for medical, scientific research and food storage fields that require precise temperature control. At the same time, through the intelligent control strategy, the system can quickly adjust the compressor 10 speed and switch structure 40 control according to the temperature change at different heights in the storage box, effectively avoiding excessive refrigeration and temperature stratification, improving energy utilization efficiency, reducing operating costs, and providing reliable protection for long-term stable storage of goods. In addition, the system also has the functions of anti-condensation, throttling and drying filtration, further enhancing its adaptability and stability in complex environments, and has wide application prospects and practical value.

[0097] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0098] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments are not meant to limit the scope of the present application unless otherwise specifically stated. It should be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for the sake of convenience in description. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification as appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0099] In the description of the present application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0100] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0101] In addition, it should be noted that the use of "first", "second" and the like words to define parts only facilitates the differentiation of corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0102] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A refrigeration system characterized by, Comprise: A compressor (10) and a condenser (20), the gas outlet of the compressor (10) is communicated with the inlet of the condenser (20); An evaporation branch (30) for refrigerating the storage space (81) of the box body (80) of the storage box, at least two evaporators arranged in series are arranged on the evaporation branch (30), and the at least two evaporators are arranged at intervals on the box body (80) of the storage box, the evaporation branch (30) has a first communication port (31) and a second communication port (32); Wherein, 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 communication port (31) is communicated with the outlet of the condenser (20), and the second communication port (32) is communicated with the air inlet of the compressor (10); when the evaporation branch (30) is in the second evaporation state, the first communication port (31) is communicated with the air inlet of the compressor (10), and the second communication port (32) is communicated with the outlet of the condenser (20); A switching structure (40), the first communication port (31), the second communication port (32), the outlet of the condenser (20) and the air inlet of the compressor (10) are connected with the switching structure (40), 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; The at least two evaporators are arranged at intervals along the height direction of the box body (80) of the storage box.

2. The refrigeration system of claim 1, wherein, The switching structure (40) is a four-way valve, the four-way valve has a first switching port (41) communicated with the air inlet of the compressor (10), a second switching port (42) communicated with the second communication port (32), a third switching port (43) communicated with the outlet of the condenser (20) and a fourth switching port (44) communicated with the first communication port (31); when the four-way valve is in the first switching state, the first switching port (41) is communicated with the second switching port (42), and the third switching port (43) is communicated with the fourth switching port (44); when the four-way valve is in the second switching state, the second switching port (42) is communicated with the third switching port (43), and the first switching port (41) is communicated with the fourth switching port (44).

3. The refrigeration system of claim 1, wherein, The refrigeration system further comprises: A condensation prevention pipe (50), one end of the condensation prevention pipe (50) is communicated with the outlet of the condenser (20), the other end of the condensation prevention pipe (50) is communicated with the first communication port (31) or the second communication port (32); and / or, a throttling device (60) having one end in communication with the outlet of the condenser (20) and the other end in communication with the first communication port (31) or the second communication port (32); and / or a drying filter (70) having one end in communication with the outlet of the condenser (20) and the other end in communication with the first communication port (31) or the second communication port (32).

4. A preservation case characterized by comprising: comprising: a box body (80) having a storage space (81); the refrigeration system of any one of claims 1 to 3, the evaporation branch (30) of the refrigeration system being arranged in the storage space (81) or in contact with a wall surface of the box body (80).

5. The preservation kit of claim 4, wherein The preservation box further comprises: a temperature detection device arranged in the box body (80), the temperature detection device being configured to detect the temperature in the box body (80); a control device, the temperature detection device and the refrigeration system being connected to the control device, the control device being configured to control the refrigeration system according to the detection result of the temperature detection device.

6. The preservation box of claim 5, wherein: the temperature detection device is at least two, and the at least two temperature detection devices 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 being movably arranged on the main body, and the temperature detection device being arranged on the side of the main body away from the box door; and / or the preservation 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).

7. A control method characterized by, The control method is applicable to the preservation box of any one of claims 4 to 6, and the control method comprises: obtaining the upper layer temperature T1 of the storage space of the box body of the preservation box and the lower layer temperature T2 of the storage space; controlling the operating state of the compressor of the refrigeration system of the preservation box and / or the communication state of the evaporation branch of the refrigeration system according to the upper layer temperature T1 of the storage space and the lower layer temperature T2 of the storage space.

8. The control method according to claim 7, characterized by, The control of the operating state of the compressor of the refrigeration system of the preservation box and / or the communication state of the evaporation branch of the refrigeration system according to the upper layer temperature T1 of the storage space and the lower layer temperature T2 of the storage space comprises: comparing the upper layer temperature T1 of the storage space with a preset temperature range and comparing the lower layer temperature T2 of the storage space with the preset temperature range; controlling the operating state of the compressor of the refrigeration system and / or the communication state of the evaporation branch of the refrigeration system according to the comparison result of the upper layer temperature T1 of the storage space with the preset temperature range and the comparison result of the lower layer temperature T2 of the storage space with the preset temperature range.

9. The control method according to claim 8, characterized by, When the evaporation branch is in the first evaporation state, the refrigerant of the evaporation branch flows from the upper evaporation device to the lower evaporation device; when the evaporation branch is in the second evaporation state, the refrigerant of the evaporation branch flows from the lower evaporation device to the upper evaporation device; and the control of 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 results of the upper temperature T1 of the storage space and the preset temperature range and the comparison results of the lower temperature T2 of the storage space and the preset temperature range comprises: 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 maintain the first evaporation state, and the compressor is controlled to maintain 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 connection state of the evaporation branch of the refrigeration system is controlled according to the comparison results of the upper temperature T1 of the storage space and the preset temperature range and the comparison results of the lower temperature T2 of the storage space and the preset temperature range.

10. The control method according to claim 9, characterized by, The control of 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 results of the upper temperature T1 of the storage space and the preset temperature range and the comparison results of the lower temperature T2 of the storage space and the preset temperature range 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 comprises: 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 maintain the first evaporation state, and the compressor is controlled to maintain 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 connection state of the evaporation branch of the refrigeration system is controlled according to the comparison results of the upper temperature T1 of the storage space and the preset temperature range and the comparison results of the lower temperature T2 of the storage space and the preset temperature range. The control of 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 results of the upper temperature T1 of the storage space and the preset temperature range and the comparison results of the lower temperature T2 of the storage space and the preset temperature range 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 comprises: 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 maintain the first evaporation state, and the compressor is controlled to maintain 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 connection state of the evaporation branch of the refrigeration system is controlled according to the comparison results of the upper temperature T1 of the storage space and the preset temperature range and the comparison results of the lower temperature T2 of the storage space and the preset temperature range.

11. The control method according to claim 10, wherein after the control of the speed of the compressor to PL and the control of the evaporation branch to maintain the first evaporation state, the control method further comprises: when the lower temperature T2 of the storage space is less than or equal to the upper limit value of the preset temperature range, the speed of the compressor is controlled to rise to P0; and / or, after the control of the speed of the compressor to maintain the current speed and the control of the evaporation branch to switch to the second evaporation state, the control method further comprises: when the lower temperature T2 of the storage space is less than or equal to the upper limit of the preset temperature range, the rotation speed of the compressor is controlled to increase to P0, and the evaporation branch is controlled to switch to the first evaporation state.

12. The control method according to claim 9, characterized by, The control of the operation state of the compressor and / or the communication state of the evaporation branch of the refrigeration system 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 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 comprises: 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 rotation speed of the compressor is controlled to increase to PR, and the evaporation branch is controlled to maintain in 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 rotation speed of the compressor is controlled to increase to PD, and the evaporation branch is controlled to maintain in the first evaporation state.

13. The control method according to claim 12, wherein after the control of the rotation speed of the compressor to increase to PR and the control of the evaporation branch to maintain in the first evaporation state, the control method further comprises: acquiring 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, the rotation speed of the compressor is controlled to continue to increase to PI; and when the upper temperature T1 of the storage space is less than or equal to the upper limit of the preset temperature range, the rotation speed of the compressor is controlled to decrease to P0; and / or after the control of the rotation speed of the compressor to increase to PD and the control of the evaporation branch to maintain in the first evaporation state, the control method further comprises: acquiring 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 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, the rotation speed of the compressor is controlled to increase to PI; and when the upper temperature T1 of the storage space is less than or equal to the lower limit of the preset temperature range and the lower temperature T2 of the storage space is greater than the upper limit of the preset temperature range, the evaporation branch is controlled to switch to the second evaporation state.

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