Integrated cabinet with refrigeration air conditioner and refrigeration control method

Abstract

The application belongs to the technical field of cabinets, and particularly relates to an integrated cabinet with a refrigeration air conditioner and a refrigeration control method. The integrated cabinet comprises a cabinet shell, a compressor, an evaporator and a condenser. A partition plate is arranged in the cabinet shell, and the partition plate divides the cabinet shell into a first shell part and a second shell part. The evaporator is arranged in the interior of the first shell part, and the compressor is arranged in the interior of the second shell part. The second shell part comprises at least two condensers. The compressor and the evaporator are sequentially connected with part or all of the condensers to form a refrigeration cycle system. In the application, the total heat exchange area of the condensers can be changed to adjust the refrigeration capacity, thereby solving the technical problem that the cabinet load cannot adapt to load changes, and being beneficial to improving the energy efficiency ratio of the whole machine and reducing the energy consumption of the whole machine. Meanwhile, the condensers are used to replace part of the cabinet shell, which can save the arrangement space in the interior of the cabinet shell and reduce the material cost.

Description

Technical Field

[0001] This invention belongs to the field of server rack technology, and particularly relates to an integrated server rack with refrigeration and air conditioning and a refrigeration control method. Background Technology

[0002] Server racks are freestanding or self-supporting enclosures used to house electrical equipment. With the advent of the 5G era, the number of outdoor server racks has increased significantly, leading to a growing demand for integrated server racks with built-in cooling systems. These racks require high energy efficiency ratios and low overall cost. However, the outdoor environment is highly variable, and outdoor radiation significantly impacts the load inside the rack. Existing integrated server racks, due to space limitations within the rack housing, have small and non-adjustable condenser heat exchange areas. This results in the cooling systems being unable to adapt to load changes, leading to energy waste under low outdoor operating conditions. Summary of the Invention

[0003] This invention provides an integrated cabinet with refrigeration and air conditioning and a refrigeration control method to solve the technical problems that integrated cabinets cannot adapt to load changes and that the space for air conditioning in the cabinet is small. It can improve the energy efficiency ratio of the whole unit and reduce the cost of the whole unit.

[0004] A first aspect of the present invention provides an integrated cabinet with refrigeration and air conditioning, comprising: a cabinet housing, a compressor, an evaporator, and a condenser.

[0005] The cabinet housing is equipped with a partition plate that divides the cabinet housing into a first housing section and a second housing section. The evaporator is located inside the first housing section, and the compressor is located inside the second housing section. The second housing section includes at least two condensers.

[0006] The compressor and the evaporator can be connected in series with some or all of the condensers to form a refrigeration cycle system.

[0007] In one embodiment, the second housing portion includes a first condenser, a second condenser, and a third condenser.

[0008] The compressor's inlet is connected to the inlet of the first condenser. The first condenser's outlet is connected to the inlet of the evaporator and the inlet of the second condenser in an open-closed manner. The second condenser's outlet is connected to the inlet of the evaporator and the inlet of the third condenser in an open-closed manner. The third condenser's outlet is connected to the inlet of the evaporator in an open-closed manner.

[0009] In one embodiment, the outlet of the first condenser is connected to the inlet of the second condenser via a first shut-off valve, the outlet of the first condenser is connected to the inlet of the evaporator via a second shut-off valve, the outlet of the second condenser is connected to the inlet of the third condenser via a third shut-off valve, the outlet of the second condenser is connected to the inlet of the evaporator via a fourth shut-off valve, and the outlet of the third condenser is connected to the inlet of the evaporator via a fifth shut-off valve.

[0010] In one embodiment, an expansion valve is provided at the inlet end of the evaporator.

[0011] In one embodiment, heat dissipation fins are provided on the inner wall of the condenser, and the heat dissipation fins are able to contact the fluid inside the condenser.

[0012] In one embodiment, the device further includes a first fan, which is disposed inside the first housing portion.

[0013] In one embodiment, the device further includes a second fan, wherein an air inlet and an air outlet are respectively provided on the side wall of the second housing portion, the air inlet and the air outlet are arranged opposite to each other, and the second fan is disposed in the air inlet.

[0014] In one embodiment, a filter screen is provided in the air outlet.

[0015] In one embodiment, a temperature sensing element for detecting the ambient temperature is provided on the outer wall of the cabinet housing.

[0016] A second aspect of the present invention provides a cooling control method for controlling the cooling air conditioner of the aforementioned integrated cabinet, comprising:

[0017] The compressor, the evaporator, and some or all of the condensers are connected in series to form a refrigeration cycle system according to the ambient temperature, and the compressor is turned on to make the refrigeration cycle system run.

[0018] In one embodiment, the method further includes: controlling the second fan to turn on or off based on the ambient temperature.

[0019] In one embodiment, if the ambient temperature is less than or equal to a first preset temperature, the compressor, the evaporator and the first condenser are connected in series to form the refrigeration cycle system, and the compressor is turned on to make the refrigeration cycle system run. At the same time, the first fan is turned on and the second fan is turned off.

[0020] In one embodiment, if the ambient temperature is greater than a first preset temperature and less than or equal to a second preset temperature, the compressor, the evaporator and the first condenser are connected in series to form the refrigeration cycle system, and the compressor is turned on to make the refrigeration cycle system run. At the same time, the first fan and the second fan are turned on.

[0021] In one embodiment, if the ambient temperature is greater than a second preset temperature and less than or equal to a third preset temperature, the compressor, the evaporator, the first condenser, and the second condenser are connected in series to form the refrigeration cycle system, and the compressor is turned on to run the refrigeration cycle system. At the same time, the first fan and the second fan are turned on.

[0022] In one embodiment, if the ambient temperature is greater than a third preset temperature, the compressor, the evaporator, the first condenser, the second condenser, and the third condenser are connected in series to form the refrigeration cycle system, and the compressor is turned on to run the refrigeration cycle system. At the same time, the first fan and the second fan are turned on.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] (1) In this invention, the number of condensers in the refrigeration cycle system is changed based on the change of the external ambient temperature, which can change the total heat exchange area of ​​the condensers to achieve the adjustment of the cooling capacity, thereby solving the technical problem that the load inside the cabinet cannot adapt to the load change, which is conducive to improving the energy efficiency ratio of the whole machine and reducing the energy consumption of the whole machine.

[0025] (2) In this invention, the condenser is incorporated as part of the cabinet housing, which saves the internal layout space of the cabinet housing, is conducive to increasing the heat exchange area of ​​the evaporator, facilitates the layout of pipelines inside the cabinet, and also helps to reduce the material cost of the cabinet housing. Attached Figure Description

[0026] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the vertical cross-sectional structure of an integrated cabinet with a cooling air conditioner according to one embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the horizontal cross-sectional structure of an integrated cabinet with a cooling air conditioner in one embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the air outlet and filter screen in one embodiment of the present invention;

[0030] Figure 4 This is a flowchart of the refrigeration control method of the present invention.

[0031] Figure label:

[0032] 1. Cabinet housing; 2. Compressor; 3. Evaporator;

[0033] 4. First condenser; 5. Second condenser; 6. Third condenser;

[0034] 7. Partition plate; 8. First fan; 9. Second fan;

[0035] 10. Air inlet; 11. Air outlet; 12. Filter;

[0036] 13. First shut-off valve; 14. Second shut-off valve; 15. Third shut-off valve;

[0037] 16. Fourth shut-off valve; 17. Fifth shut-off valve; 18. Expansion valve;

[0038] 19. Temperature sensing element; 20. Heat sink fins; 21. Electrical equipment. Detailed Implementation

[0039] The invention will now be further described with reference to the accompanying drawings.

[0040] like Figure 1-3 As shown, according to a first aspect of the present invention, the integrated cabinet with refrigeration and air conditioning includes: a cabinet housing 1, a compressor 2, an evaporator 3, and a condenser. A partition 7 is provided inside the cabinet housing 1, dividing the cabinet housing 1 into a first housing section and a second housing section. The evaporator 3 is disposed inside the first housing section, and the compressor 2 is disposed inside the second housing section. The second housing section includes at least two condensers, wherein the compressor 2 and the evaporator 3 can be connected in series with some or all of the condensers to form a refrigeration cycle system.

[0041] In this invention, the compressor 2, evaporator 3, and condenser are components of a refrigeration and air conditioning system. The condenser is both a component of the refrigeration and air conditioning system and part of the cabinet housing 1. Specifically, the condenser is a plate condenser, and more specifically, a plate parallel-flow condenser, serving as a side plate of the second housing section. Furthermore, the other parts of the cabinet housing 1, excluding the condenser, can be made of ordinary metal plates.

[0042] In this invention, by changing the number of condensers in the refrigeration cycle system based on the ambient temperature, the total heat exchange area of ​​the condensers can be changed, thereby adjusting the cooling capacity. This solves the technical problem that the load inside the cabinet cannot adapt to load changes, which is beneficial to improving the energy efficiency ratio of the whole machine and reducing the energy consumption of the whole machine.

[0043] In this invention, the condenser is incorporated as part of the cabinet housing 1, which saves the internal layout space of the cabinet housing 1, helps to increase the heat exchange area of ​​the evaporator 3, facilitates the layout of pipelines inside the cabinet, and also helps to reduce the material cost of the cabinet housing 1.

[0044] It should be noted that the interior of the first housing is the evaporation side, the interior of the second housing is the condensation side, and the electrical equipment 21 such as the server is located inside the first housing.

[0045] The refrigerant flow process of the refrigeration cycle system is as follows: The refrigerant enters part or all of the condenser from the compressor 2, exchanges heat with the outside air to cool down, and then enters the evaporator 3, absorbs heat from the air inside the second shell, and then returns to the compressor 2.

[0046] Example 1

[0047] In this embodiment, the second housing includes a first condenser 4, a second condenser 5, and a third condenser 6. The inlet end of the compressor 2 is connected to the inlet end of the first condenser 4. The outlet end of the first condenser 4 is connected in an open-closed manner to the inlet end of the evaporator 3 and the inlet end of the second condenser 5. The outlet end of the second condenser 5 is connected in an open-closed manner to the inlet end of the evaporator 3 and the inlet end of the third condenser 6. The outlet end of the third condenser 6 is connected in an open-closed manner to the inlet end of the evaporator 3.

[0048] In this embodiment, as Figure 2 As shown, the three sides of the second housing are composed of three condensers connected in series. Under different ambient temperatures, the first condenser 4, or the first condenser 4 and the second condenser 5, or the first condenser 4, the second condenser 5 and the third condenser 6 can be selected to form different refrigeration cycle systems. This can change the total heat exchange area of ​​the condensers in the refrigeration cycle system, solve the technical problem that the load inside the cabinet cannot adapt to load changes, and help improve the energy efficiency ratio of the whole machine and reduce the energy consumption of the whole machine.

[0049] The heat exchange areas of the first condenser 4, the second condenser 5, and the third condenser 6 can be the same or different. For example, the heat exchange areas of the second condenser 5 and the third condenser 6 can both be smaller than the heat exchange area of ​​the first condenser 4.

[0050] Specifically, the outlet of the first condenser 4 is connected to the inlet of the second condenser 5 via a first shut-off valve 13; the outlet of the first condenser 4 is connected to the inlet of the evaporator 3 via a second shut-off valve 14; the outlet of the second condenser 5 is connected to the inlet of the third condenser 6 via a third shut-off valve 15; the outlet of the second condenser 5 is connected to the inlet of the evaporator 3 via a fourth shut-off valve 16; and the outlet of the third condenser 6 is connected to the inlet of the evaporator 3 via a fifth shut-off valve 17. By controlling the opening and closing of the first shut-off valve 13, second shut-off valve 14, third shut-off valve 15, fourth shut-off valve 16, and fifth shut-off valve 17, the appropriate condensers can be selected to form a refrigeration cycle system for refrigeration.

[0051] Specifically, an expansion valve 18 is installed at the inlet end of the evaporator 3. The expansion valve 18 allows the high-temperature and high-pressure liquid refrigerant to be throttled into low-temperature and low-pressure wet vapor. The refrigerant then absorbs heat in the evaporator 3 to achieve a cooling effect. The expansion valve 18 controls the valve flow rate by changing the superheat at the end of the evaporator 3, preventing insufficient utilization of the evaporator 3 area and knocking phenomena.

[0052] Preferably, the inner wall of the condenser is provided with heat dissipation fins 20, which can contact the fluid inside the condenser. The condenser with heat dissipation fins 20 has good heat dissipation performance, which is beneficial to improving the cooling effect and energy efficiency ratio of the air conditioner.

[0053] A temperature sensing element 19 for detecting the ambient temperature is provided on the outer wall of the cabinet housing 1. The ambient temperature outside the cabinet housing 1 is obtained by setting the temperature sensing element 19.

[0054] Specifically, the temperature detection element 19 includes a temperature sensing bulb or a temperature sensor, preferably a temperature sensing bulb. The temperature sensing bulb measures the ambient dry-bulb temperature, which is the actual temperature of the air in contact with the bulb's surface, regardless of humidity. The ambient temperature measured by the temperature sensing bulb is more accurate, leading to more precise control of the refrigeration and air conditioning system.

[0055] Example 2

[0056] This embodiment describes the differences from Embodiment 1, while the similarities will not be repeated.

[0057] In this embodiment, the integrated cabinet also includes: a first fan 8 and a second fan 9.

[0058] The first fan 8 is disposed inside the first housing section. The first fan 8 is used to circulate the air inside the first housing section (evaporator side) to promote the evaporator 3 to fully and quickly absorb heat from the air inside the first housing section, thereby reducing the temperature around the electrical equipment 21. Preferably, the first fan 8 is disposed close to the evaporator 3.

[0059] An air inlet 10 and an air outlet 11 are respectively provided on the side wall of the second housing, with the air inlet 10 and air outlet 11 facing each other. A second fan 9 is installed in the air inlet 10. The second fan 9 draws air from outside the cabinet housing 1 into the interior of the second housing through the air inlet 10, where it exchanges heat with the inner wall of the condenser, cooling the refrigerant inside. The air then flows out through the air outlet 11, thus effectively promoting heat exchange between the outside air and the condenser and improving the cooling effect.

[0060] Specifically, such as Figure 1 and Figure 2 As shown, the air outlet 11 is located in the center of the second condenser 5 in the second housing, and the air inlet 10 is located on the other side of the second housing opposite to the second condenser 5.

[0061] Preferably, a filter screen 12 is provided in the air outlet 11 to protect the internal space of the second housing.

[0062] More specifically, both the air outlet 11 and the filter 12 are rectangular.

[0063] like Figure 4 As shown, according to a second aspect of the present invention, the refrigeration control method of the present invention is used to control the refrigeration air conditioner of the aforementioned integrated cabinet, comprising:

[0064] The compressor 2, evaporator 3, and some or all of the condensers are connected in series to form a refrigeration cycle system according to the ambient temperature, and the compressor 2 is turned on to make the refrigeration cycle system run.

[0065] It should be noted that the above-mentioned ambient temperature refers to the ambient temperature outside the cabinet housing 1.

[0066] In this invention, by changing the number of condensers in the refrigeration cycle system based on the ambient temperature, the total heat exchange area of ​​the condensers can be changed, thereby adjusting the cooling capacity. This solves the technical problem that the load inside the cabinet cannot adapt to load changes, which is beneficial to improving the energy efficiency ratio of the whole machine and reducing the energy consumption of the whole machine.

[0067] Preferably, the system further includes controlling the second fan 9 to turn on or off based on the ambient temperature. Controlling the start and stop of the second fan 9 based on the ambient temperature allows for shutting down the second fan 9 in low ambient temperature conditions such as rainy days or winter, which helps reduce overall energy consumption.

[0068] Example 3

[0069] In this embodiment, the integrated cabinet includes: a cabinet housing 1, a compressor 2, an evaporator 3, a condenser, a first fan 8, and a second fan 9. A partition 7 is provided inside the cabinet housing 1, dividing the cabinet housing 1 into a first housing section and a second housing section. The evaporator 3 and the first fan 8 are located inside the first housing section, and the compressor 2 is located inside the second housing section. An air inlet 10 and an air outlet 11 are respectively provided on the side wall of the second housing section, with the air inlet 10 and air outlet 11 facing each other. The second fan 9 is located in the air inlet 10.

[0070] The second housing includes a first condenser 4, a second condenser 5, and a third condenser 6. The inlet end of the compressor 2 is connected to the inlet end of the first condenser 4. The outlet end of the first condenser 4 is connected in an open-closed manner to the inlet end of the evaporator 3 and the inlet end of the second condenser 5. The outlet end of the second condenser 5 is connected in an open-closed manner to the inlet end of the evaporator 3 and the inlet end of the third condenser 6. The outlet end of the third condenser 6 is connected in an open-closed manner to the inlet end of the evaporator 3.

[0071] In this embodiment, the refrigeration air conditioner includes a compressor 2, an evaporator 3, a first condenser 4, a second condenser 5, a third condenser 6, a first fan 8, and a second fan 9. Depending on the ambient temperature, the compressor 2 and evaporator 3 are connected in series with their respective condensers to form different refrigeration cycle systems and operate for cooling. Simultaneously, the first fan 8 promotes heat exchange between the air inside the first housing and the refrigeration unit inside the evaporator 3, and the second fan 9 promotes heat exchange between the air outside the cabinet housing 1 and the condenser.

[0072] In this embodiment, the air conditioner has four operating states depending on the ambient temperature. Specifically:

[0073] The first working state: If the ambient temperature is less than or equal to the first preset temperature, the compressor 2, evaporator 3 and first condenser 4 are connected in series to form a refrigeration cycle system, and the compressor 2 is turned on to make the refrigeration cycle system run. At the same time, the first fan 8 is turned on and the second fan 9 is turned off.

[0074] In this system, the refrigeration unit's compressor 2 passes through the first condenser 4 and the evaporator 3 before returning to the compressor 2. At this time, the outdoor temperature is low, and the first condenser 4 can meet the refrigeration requirements. At the same time, the outdoor ambient temperature can meet the cooling requirements of the condenser. Therefore, the first fan 8 is turned off to reduce the overall energy consumption of the unit.

[0075] Specifically, if the ambient temperature is less than or equal to the first preset temperature, the compressor 2, the first fan 8, and the second shut-off valve 14 are controlled to open, and the second fan 9, the first shut-off valve 13, the third shut-off valve 15, the fourth shut-off valve 16, and the fifth shut-off valve 17 are controlled to close.

[0076] The second working state: If the ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the compressor 2, evaporator 3 and first condenser 4 are connected in series to form a refrigeration cycle system, and the compressor 2 is turned on to make the refrigeration cycle system run. At the same time, the first fan 8 and the second fan 9 are turned on.

[0077] In this process, the refrigeration unit's compressor 2 passes through the first condenser 4 and the evaporator 3 before returning to the compressor 2. At this time, the outdoor temperature is normal, and the first condenser 4 can meet the refrigeration requirements. However, the outdoor ambient temperature is insufficient to meet the cooling requirements of the condenser, so the first fan 8 is turned on.

[0078] Specifically, if the ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the compressor 2, the first fan 8, the second fan 9 and the second shut-off valve 14 are controlled to open, and the first shut-off valve 13, the third shut-off valve 15, the fourth shut-off valve 16 and the fifth shut-off valve 17 are controlled to close.

[0079] The third working state: If the ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, the compressor 2, evaporator 3, first condenser 4 and second condenser 5 are connected in series to form a refrigeration cycle system, and the compressor 2 is turned on to make the refrigeration cycle system run. At the same time, the first fan 8 and the second fan 9 are turned on.

[0080] In this system, the refrigeration unit's components pass sequentially from compressor 2 through the first condenser 4, the second condenser 5, and the evaporator 3 before returning to compressor 2. At this time, the outdoor temperature is medium to high, and outdoor radiation affects the interior of the unit, increasing the load. Using only the first condenser 4 is insufficient to meet the cooling demand; therefore, the first condenser 4 and the second condenser 5, connected in series, are connected between compressor 2 and evaporator 3 to increase the total heat exchange area of ​​the condensers and improve the cooling capacity. Simultaneously, the outdoor ambient temperature is insufficient to meet the cooling requirements of the condensers; therefore, the first fan 8 is activated.

[0081] Specifically, if the ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, the compressor 2, the first fan 8, the second fan 9, the first shut-off valve 13 and the fourth shut-off valve 16 are controlled to open, and the second shut-off valve 14, the third shut-off valve 15 and the fifth shut-off valve 17 are controlled to close.

[0082] The fourth working state: If the ambient temperature is higher than the third preset temperature, the compressor 2, evaporator 3, first condenser 4, second condenser 5 and third condenser 6 are connected in series to form a refrigeration cycle system, and the compressor 2 is turned on to make the refrigeration cycle system run. At the same time, the first fan 8 and the second fan 9 are turned on.

[0083] In this system, the refrigeration unit's components pass sequentially from compressor 2 through the first condenser 4, the second condenser 5, and the evaporator 3 before returning to compressor 2. At this time, the outdoor temperature is extremely high, and outdoor radiation affects the interior of the unit, increasing the load. The first condenser 4 and the second condenser 5 alone cannot meet the cooling demand. Therefore, the first condenser 4, the second condenser 5, and the third condenser 6, connected in series, are connected between compressor 2 and evaporator 3 to further increase the total heat exchange area of ​​the condensers and improve the cooling capacity. Simultaneously, the outdoor ambient temperature is insufficient to meet the cooling requirements of the condensers; therefore, the first fan 8 is activated.

[0084] Specifically, if the ambient temperature is greater than the third preset temperature, the compressor 2, the first fan 8, the second fan 9, the first shut-off valve 13, the third shut-off valve 15 and the fifth shut-off valve 17 are controlled to open, and the second shut-off valve 14 and the fourth shut-off valve 16 are controlled to close.

[0085] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0086] The terms "upper" and "lower" used in this invention are defined in their usual sense. For example, referring to the direction of gravity, the direction of gravity is downward, and the opposite direction is upward. Similarly, "upper" is the top, and "lower" is the bottom. These terms are used only for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to these relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0087] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An integrated server rack with a cooling air conditioner, characterized in that, include: The cabinet housing, compressor, evaporator, and condenser The cabinet housing is equipped with a partition plate that divides the cabinet housing into a first housing section and a second housing section. The evaporator is located inside the first housing section, and the compressor is located inside the second housing section. The second housing section includes at least two condensers. The compressor and the evaporator can be connected in series with some or all of the condensers to form a refrigeration cycle system. The second housing includes a first condenser, a second condenser, and a third condenser; The compressor's inlet is connected to the inlet of the first condenser. The first condenser's outlet is connected to the inlet of the evaporator and the inlet of the second condenser in an open-closed manner. The second condenser's outlet is connected to the inlet of the evaporator and the inlet of the third condenser in an open-closed manner. The third condenser's outlet is connected to the inlet of the evaporator in an open-closed manner.

2. The integrated cabinet according to claim 1, characterized in that, The outlet of the first condenser is connected to the inlet of the second condenser via a first shut-off valve. The outlet of the first condenser is connected to the inlet of the evaporator via a second shut-off valve. The outlet of the second condenser is connected to the inlet of the third condenser via a third shut-off valve. The outlet of the second condenser is connected to the inlet of the evaporator via a fourth shut-off valve. The outlet of the third condenser is connected to the inlet of the evaporator via a fifth shut-off valve.

3. The integrated cabinet according to any one of claims 1-2, characterized in that, An expansion valve is installed at the inlet end of the evaporator.

4. The integrated cabinet according to any one of claims 1-2, characterized in that, The inner wall of the condenser is provided with heat dissipation fins, which can contact the fluid inside the condenser.

5. The integrated cabinet according to any one of claims 1-2, characterized in that, Also includes: The first fan is located inside the first housing portion.

6. The integrated cabinet according to any one of claims 1-2, characterized in that, Also includes: The second fan has an air inlet and an air outlet respectively provided on the side wall of the second housing, the air inlet and the air outlet are arranged opposite to each other, and the second fan is arranged in the air inlet.

7. The integrated cabinet according to claim 6, characterized in that, A filter screen is installed in the air outlet.

8. The integrated cabinet according to any one of claims 1-2, characterized in that, The outer wall of the cabinet housing is equipped with a temperature detection element for detecting the ambient temperature.

9. A refrigeration control method for controlling the refrigeration air conditioner of the integrated cabinet according to any one of claims 1-8, characterized in that, include: The compressor, the evaporator, and some or all of the condensers are connected in series to form a refrigeration cycle system according to the ambient temperature, and the compressor is turned on to make the refrigeration cycle system run.

10. The refrigeration control method according to claim 9, characterized in that, Also includes: The second fan is turned on or off based on the ambient temperature.

11. The refrigeration control method according to claim 10, characterized in that, If the ambient temperature is less than or equal to the first preset temperature, the compressor, the evaporator and the first condenser are connected in series to form the refrigeration cycle system, and the compressor is turned on to make the refrigeration cycle system run. At the same time, the first fan is turned on and the second fan is turned off.

12. The refrigeration control method according to claim 10, characterized in that, If the ambient temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the compressor, the evaporator and the first condenser are connected in series to form the refrigeration cycle system, and the compressor is turned on to make the refrigeration cycle system run. At the same time, the first fan and the second fan are turned on.

13. The refrigeration control method according to claim 10, characterized in that, If the ambient temperature is greater than the second preset temperature and less than or equal to the third preset temperature, the compressor, the evaporator, the first condenser, and the second condenser are connected in series to form the refrigeration cycle system, and the compressor is turned on to run the refrigeration cycle system. At the same time, the first fan and the second fan are turned on.

14. The refrigeration control method according to claim 10, characterized in that, If the ambient temperature is greater than the third preset temperature, the compressor, the evaporator, the first condenser, the second condenser, and the third condenser are connected in series to form the refrigeration cycle system, and the compressor is turned on to make the refrigeration cycle system run. At the same time, the first fan and the second fan are turned on.

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