Temperature control methods, cryogenic refrigeration systems and cryogenic refrigeration cabinets

Abstract

This application discloses a temperature control method, a cryogenic refrigeration system, and a cryogenic refrigeration cabinet, relating to the field of temperature control technology and applied to a cryogenic refrigeration system. The cryogenic refrigeration system includes a dual-suction compressor and a temperature acquisition device. The method acquires first temperature information collected by the temperature acquisition device, including a first refrigeration temperature in the refrigeration zone, a first freezing temperature in the freezing zone, and a first ambient temperature in the ambient zone. When the first refrigeration temperature exceeds a preset upper limit temperature, or the first freezing temperature exceeds a preset upper limit temperature, a control command for the dual-suction compressor is determined based on the first ambient temperature. The method then acquires second temperature information collected by the temperature acquisition device under the control command for the dual-suction compressor and controls the dual-suction compressor based on this second temperature information to achieve temperature control of the refrigeration and freezing zones. This application reduces the cost of implementing temperature control.

Description

Technical Field

[0001] This application relates to the field of temperature control technology, and in particular to a temperature control method, a cryogenic refrigeration system, and a cryogenic refrigeration cabinet. Background Technology

[0002] As refrigeration and freezing temperature control technologies are increasingly used in various fields, users are also placing higher demands on temperature control methods.

[0003] Traditional temperature control methods use two single-suction compressors to form two independent low-temperature refrigeration systems, and use these two systems to control the temperature of refrigeration and freezing respectively. This method has a drawback: it requires two independent low-temperature refrigeration systems to control the temperature of refrigeration and freezing, which results in higher costs.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of this application is to provide a temperature control method, a cryogenic refrigeration system, and a cryogenic refrigeration cabinet, aiming to solve the technical problem of high cost in achieving temperature control.

[0006] To achieve the above objectives, this application provides a temperature control method applied to a cryogenic refrigeration system, the cryogenic refrigeration system including a dual-suction compressor and a temperature acquisition device, the temperature control method comprising:

[0007] The temperature information collected by the temperature acquisition device is obtained, wherein the first temperature information includes the first refrigeration temperature of the refrigeration area, the first freezing temperature of the freezing area, and the first ambient temperature of the ambient area.

[0008] When the first refrigeration temperature is greater than the preset upper limit temperature for refrigeration, or the first freezing temperature is greater than the preset upper limit temperature for freezing, the control command for the dual-suction compressor is determined based on the first ambient temperature.

[0009] The temperature acquisition device collects the second temperature information under the control command of the dual-suction compressor, and controls the dual-suction compressor according to the second temperature information to achieve temperature control of the refrigeration area and the freezing area.

[0010] In one embodiment, the second temperature information includes a second refrigeration temperature of the refrigeration zone, a second freezing temperature of the freezing zone, and a second ambient temperature of the ambient zone. The step of controlling the dual-suction compressor based on the second temperature information includes:

[0011] When the second refrigeration temperature is greater than the upper limit of the refrigeration temperature, or the second freezing temperature is greater than the upper limit of the freezing temperature, the second ambient temperature is taken as the first ambient temperature, and the step of determining the dual-suction compressor control command based on the first ambient temperature is executed.

[0012] When the second refrigeration temperature is greater than the preset lower refrigeration temperature and the second freezing temperature is less than or equal to the preset lower freezing temperature, the speed of the dual-suction compressor is reduced according to the preset speed reduction command, wherein the lower refrigeration temperature is less than the upper refrigeration temperature and the lower freezing temperature is less than the upper freezing temperature.

[0013] When the second refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature, and the second freezing temperature is greater than the preset lower limit freezing temperature, the dual-suction compressor is controlled to increase its speed according to the preset speed increase command.

[0014] When the second refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature, and the second freezing temperature is less than or equal to the preset lower limit freezing temperature, the dual-suction compressor is controlled to stop.

[0015] In one embodiment, after the step of controlling the dual-suction compressor based on the second temperature information, at least one of the following is included:

[0016] When the dual-suction compressor is under speed reduction control, after the speed reduction control is obtained, the temperature collected by the temperature acquisition device is used as the second temperature information, and when the second refrigeration temperature in the second temperature information is less than or equal to the lower limit refrigeration temperature, the dual-suction compressor is controlled to stop.

[0017] When the dual-suction compressor is under speed control, after the speed control is obtained, the temperature collected by the temperature acquisition device is used as the second temperature information, and when the second freezing temperature in the second temperature information is less than or equal to the lower freezing limit temperature, the dual-suction compressor is controlled to stop.

[0018] In one embodiment, the step of determining the dual-suction compressor control command based on the first ambient temperature includes:

[0019] The speed value corresponding to the first ambient temperature is determined as the required speed value in the preset temperature-speed correspondence table, and the required speed value is used as the control command for the dual-suction compressor.

[0020] In one embodiment, after the step of acquiring the first temperature information collected by the temperature sensor, the method includes:

[0021] When the first refrigeration temperature is greater than the preset lower limit refrigeration temperature and the first freezing temperature is less than or equal to the preset lower limit freezing temperature, the dual-suction compressor is controlled to reduce its speed according to the preset speed reduction command.

[0022] When the first refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature, and the first freezing temperature is greater than the preset lower limit freezing temperature, the dual-suction compressor is controlled to increase its speed according to the preset speed increase command.

[0023] When the first refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature, and the first freezing temperature is less than or equal to the preset lower limit freezing temperature, the dual-suction compressor is controlled to stop.

[0024] In addition, to achieve the above objectives, a low-temperature refrigeration system is provided, comprising a temperature controller, a dual-suction compressor, a temperature sensor, a refrigeration control module, and a freezing control module. The output terminal of the dual-suction compressor is connected to the input terminals of the refrigeration control module and the freezing control module. The first input terminal of the dual-suction compressor is connected to the output terminal of the refrigeration control module, and the second input terminal of the dual-suction compressor is connected to the output terminal of the freezing control module. The temperature controller is connected to the control terminal of the dual-suction compressor and the temperature sensor, wherein the temperature controller executes the temperature control method described above.

[0025] In one embodiment, the dual-suction compressor includes an exhaust port, and the cryogenic refrigeration system includes:

[0026] A condenser, wherein the condenser inlet is connected to the exhaust port;

[0027] A filter, wherein the filter inlet is connected to the condenser outlet;

[0028] The distributor has a diversion inlet connected to the filter outlet of the filter, a first diversion outlet connected to the input of the refrigeration control module, and a second diversion outlet connected to the input of the freezing control module.

[0029] In one embodiment, the dual-suction compressor includes a first return air port, and the refrigeration control module includes:

[0030] A refrigerated capillary tube, wherein the refrigerated inlet of the refrigerated capillary tube is connected to the first diversion outlet;

[0031] A refrigerated evaporator, wherein the refrigerated evaporation inlet of the refrigerated evaporator is connected to the refrigerated outlet of the refrigerated capillary tube;

[0032] A secondary return gas pipe, the first end of which is connected to the refrigeration evaporation outlet of the refrigeration evaporator, and the second end of which is connected to the first return gas port.

[0033] In one embodiment, the dual-suction compressor includes a second return port, and the refrigeration control module includes:

[0034] A cryocapillary, wherein the cryocapillary inlet is connected to the second diversion outlet;

[0035] A refrigerated evaporator, wherein the refrigeration inlet of the refrigerated evaporator is connected to the refrigeration outlet of the refrigerated capillary;

[0036] The main return gas pipe has its first end connected to the refrigeration evaporation outlet of the refrigeration evaporator, and its second end connected to the second return gas port.

[0037] In addition, to achieve the above objectives, a cryogenic refrigeration cabinet is also provided, which includes the cryogenic refrigeration system described above.

[0038] This application provides a temperature control method applied to a cryogenic refrigeration system. The cryogenic refrigeration system includes a dual-suction compressor and a temperature acquisition device. The method acquires first temperature information collected by the temperature acquisition device, which includes a first refrigeration temperature in the refrigeration zone, a first freezing temperature in the freezing zone, and a first ambient temperature in the ambient zone. When the first refrigeration temperature exceeds a preset upper limit temperature for refrigeration, or the first freezing temperature exceeds a preset upper limit temperature for freezing, a control command for the dual-suction compressor is determined based on the first ambient temperature. The method then acquires second temperature information collected by the temperature acquisition device under the control command for the dual-suction compressor, and controls the dual-suction compressor based on the second temperature information to achieve temperature control of the refrigeration zone and the freezing zone. This temperature control method is applicable to systems including dual-suction compressors (which, by their very nature, can form a refrigeration zone). This low-temperature refrigeration system uses two independent refrigeration circuits (one for the refrigeration zone and one for the freezing zone) and a temperature acquisition device. It determines the control command for the dual-suction compressor based on the first temperature information and acquires the second temperature information under the control of the dual-suction compressor. This allows for temperature control of both the refrigeration and freezing zones, avoiding the need for two separate low-temperature refrigeration systems. On one hand, the design of the low-temperature refrigeration system uses the second temperature information to control the dual-suction compressor, ensuring accurate temperature control in both zones. On the other hand, the low-temperature refrigeration system uses only one dual-suction compressor to control the temperature of both zones, reducing the need for single-suction compressors and thus lowering the cost of temperature control. Attached Figure Description

[0039] Figure 1 This is a flowchart illustrating the first embodiment of the temperature control method of this application;

[0040] Figure 2a A schematic diagram of a first embodiment of a commonly used cryogenic refrigeration system;

[0041] Figure 2b This is yet another schematic diagram of the first embodiment of a commonly used cryogenic refrigeration system;

[0042] Figure 3 This is a schematic diagram of the second embodiment of a commonly used cryogenic refrigeration system;

[0043] Figure 4 This is a schematic diagram of the framework of a third embodiment of a commonly used cryogenic refrigeration system;

[0044] Figure 5 This is a flowchart illustrating a commonly used temperature control method.

[0045] Figure 6 This is a schematic diagram of a dual-suction compressor in the cryogenic refrigeration system of this application;

[0046] Figure 7 This is a schematic diagram of the temperature control method of this application;

[0047] Figure 8 This is a schematic diagram of the controller structure of the hardware operating environment involved in the embodiments of the present invention;

[0048] Figure 9 This is a schematic diagram of the controller module of the present invention;

[0049] Figure 10 This is a schematic diagram of the low-temperature refrigeration system of the present invention;

[0050] Figure 11 This is a connection diagram of the cryogenic refrigeration system of the present invention.

[0051] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0052] Explanation of icon numbers:

[0053] 10. Dual-suction compressor; 20. Temperature controller; 30. Temperature acquisition unit; 40. Refrigeration control module; 50. Freezing control module; 101. First single-suction compressor; 100. Single-suction compressor; 102. Second single-suction compressor; 601. First condenser; 51. Freezing capillary tube; 52. Freezing evaporator; 53. Main return gas pipe; 701. First filter; 602. Second condenser; 41. Refrigeration capillary tube; 42. Refrigeration evaporator; 43. Auxiliary return gas pipe; 702. Second filter; 90. Return gas pipe; 81. Three-way valve; 82. One-way valve; 83. Flow divider; 60. Condenser; 70. Filter; 11. Exhaust port; 12. First return gas port; 13. Second return gas port; 14. Compression cylinder; 15. Process port. Detailed Implementation

[0054] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0055] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0056] Currently, cryogenic refrigeration systems on the market generally fall into three categories. The first category is... (refer to...) Figure 2a , Figure 2a This is a schematic diagram of a first embodiment of a commonly used low-temperature refrigeration system. A refrigeration circuit is formed using a first single-suction compressor 101, a first condenser 601, a first filter 701, a refrigeration capillary tube 51, and a refrigeration evaporator 52 to achieve the refrigeration effect. Further reference... Figure 2b , Figure 2bThis is another schematic diagram of the framework of a commonly used low-temperature refrigeration system. A refrigeration circuit is formed by using a second single-suction compressor 102, a second condenser 602, a second filter 702, a refrigeration capillary tube 41, and a refrigeration evaporator 42 to achieve the refrigeration effect. In other words, two independent circuits are needed to achieve the refrigeration and freezing effects respectively, which significantly increases the overall implementation cost (i.e., at least including the cost of using identical components in both circuits). The second method is as follows, refer to... Figure 3 , Figure 3 The second embodiment of a commonly used low-temperature refrigeration system is shown in the schematic diagram. A single-suction compressor 100, condenser 60, and filter 70 are used as common components for two circuits. A refrigeration capillary tube 41 and a refrigeration evaporator 42 are used in the refrigeration circuit, and a freezing capillary tube 51 and a freezing evaporator 52 are used in the freezing circuit. A three-way valve 81 is used to split the flow at the input of both circuits, and the outputs of both circuits converge back to the single-suction compressor 100 to achieve both refrigeration and freezing effects. The third method is as follows: [Refer to...] Figure 4 , Figure 4 This is a schematic diagram of the third embodiment of a commonly used cryogenic refrigeration system. It is largely the same as the second method, except that a one-way valve 82 is connected to the output of the refrigeration circuit and its output is combined with that of the refrigeration circuit. The control flow of the second and third cryogenic refrigeration systems can be found in [reference needed]. Figure 5 , Figure 5 This is a flowchart illustrating a common temperature control method. It determines whether the temperature exceeds the upper limit in the refrigerator or freezer compartment. If either compartment exceeds the limit, it controls cooling in that compartment while the other remains uncooled. Once the affected compartment reaches its lower temperature limit, the single-suction compressor stops. If both compartments exceed their upper temperature limits, one compartment cools while the other waits. Once the compartment that received the command reaches its lower temperature limit, the other compartment begins cooling. This means that simultaneous cooling is impossible throughout the entire process. Consequently, a common problem arises when opening the refrigerator door causes ambient heat to rapidly enter the refrigerator compartment, exceeding its upper temperature limit. This results in the refrigerator compartment starting cooling while the freezer stops, ultimately leading to a rapid temperature rise in the freezer compartment.

[0057] Therefore, based on the shortcomings of the above-mentioned motor control and heating function implementation methods, the temperature control method of this application is proposed: applied to a low-temperature refrigeration system including a dual-suction compressor (which, by its very nature, can form two independent refrigeration circuits for the refrigeration and freezing areas) and a temperature acquisition device, the dual-suction compressor control command is determined by the first temperature information, and the second temperature information is acquired under the control of the dual-suction compressor control command, so as to control the dual-suction compressor based on the second temperature information, thereby realizing the temperature control of the refrigeration and freezing areas. This avoids the phenomenon of needing to use two independent low-temperature refrigeration systems to achieve the temperature control of refrigeration and freezing. On the one hand, under the design of the low-temperature refrigeration system, the dual-suction compressor is controlled by the second temperature information to ensure the accuracy of temperature control of the refrigeration and freezing areas. On the other hand, the low-temperature refrigeration system only uses one dual-suction compressor to achieve the temperature control of the refrigeration and freezing areas, which can reduce the use of single-suction compressors and thus reduce the implementation cost of temperature control.

[0058] In one embodiment of this application, reference is made to Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the temperature control method of this application. The temperature control method is applied to a cryogenic refrigeration system, which includes a dual-suction compressor and a temperature acquisition device. The temperature control method includes:

[0059] Step S10: Obtain the first temperature information collected by the temperature acquisition device, wherein the first temperature information includes the first refrigeration temperature of the refrigeration area, the first freezing temperature of the freezing area, and the first ambient temperature of the ambient area.

[0060] In this embodiment, the temperature control method is applied to a cryogenic refrigeration system, which includes a dual-suction compressor and a temperature acquisition device, as can be referred to... Figure 6 , Figure 6This is a schematic diagram of a dual-suction compressor in the cryogenic refrigeration system of this application. The dual-suction compressor includes an exhaust port 11, two return ports, namely a first return port 12 and a second return port 13, a process port 15, and a compression cylinder 14. The compression cylinder 14 is used to compress the refrigerant (such as water), and then the compressed medium is transferred to the device that needs to be refrigerated through the exhaust port 11. After that, the medium after the refrigeration effect is recovered through the first return port 12 and the second return port 13. At this time, the independent refrigeration of the refrigeration zone and the freezing zone can be achieved through the two return ports. The refrigeration zone and the freezing zone can be designed with corresponding refrigeration instruments and form a refrigeration circuit with the dual-suction compressor. The temperature of the refrigeration zone and the freezing zone is then controlled based on the dual-suction compressor. The temperature acquisition device can be a commonly used temperature sensor, which is mainly used to collect the temperature of the three zones: the ambient area, the refrigeration zone, and the freezing zone. The temperature is then controlled based on the temperature of the three zones to ensure the refrigeration effect of the refrigeration zone and the freezing zone. When controlling the temperature of the entire cryogenic refrigeration system, the system acquires first temperature information from a temperature acquisition device. This first temperature information includes the first refrigeration temperature of the refrigeration zone, the first freezing temperature of the freezing zone, and the first ambient temperature of the environmental zone. Specifically, it includes the temperature values ​​acquired in the refrigeration zone, the freezing zone, and the environmental zone. The refrigeration zone refers to the area or sealed space where the refrigeration effect is achieved, the freezing zone refers to the area or sealed space where the freezing effect is achieved, and the environmental zone refers to the normal outdoor environment. Temperature control can then be performed based on the temperatures of these three zones to ensure the accuracy of the overall temperature control. Furthermore, the entire cryogenic refrigeration system can complete the temperature control of both the freezing and refrigeration zones using only one dual-suction compressor, thereby reducing the temperature control cost of the cryogenic refrigeration system.

[0061] Step S20: When the first refrigeration temperature is greater than the preset upper limit temperature of refrigeration, or the first freezing temperature is greater than the preset upper limit temperature of freezing, determine the control command of the dual-suction compressor based on the first ambient temperature.

[0062] In this embodiment, after determining the temperature values ​​of the three zones, several scenarios are handled. First, it is determined whether either the refrigeration or freezing zone has reached its upper temperature limit. If so, refrigeration control is implemented simultaneously. If one zone reaches its upper temperature limit but the other is at its lower temperature limit, control is applied to that zone, primarily by controlling the dual-suction compressor to specifically cool the refrigeration and freezing zones. If neither the refrigeration nor freezing zone has reached its respective lower temperature limit, the step of acquiring the first temperature information from the temperature sensor continues. An interval can also be set to acquire the first temperature information; this is not limited here. If the first refrigeration temperature is greater than the preset upper refrigeration temperature limit... When the first freezing temperature is greater than the preset upper limit freezing temperature (one of them reaches the upper limit), the dual-suction compressor control command will be determined based on the first ambient temperature. That is, at this time, the temperature of both the refrigerator and the freezer zones has reached the upper limit, and the control command will be determined based on the first ambient temperature. The upper limit refrigerator temperature refers to the upper limit of the refrigerator temperature set by the user, and the upper limit freezer temperature refers to the upper limit of the freezer temperature set by the user. The dual-suction compressor control command refers to the command to control the cooling of the dual-suction compressor. It can be a command to increase the cooling effect or a command to decrease the cooling effect. Thus, it can be controlled in the two cooling zones (refrigerator zone and freezer zone) to ensure the cooling effect of the two cooling zones.

[0063] Step S30: Obtain the second temperature information collected by the temperature acquisition device under the control command of the dual-suction compressor, and control the dual-suction compressor according to the second temperature information to achieve temperature control of the refrigeration area and the freezing area.

[0064] In this embodiment, after determining the control command for the dual-suction compressor, the dual-suction compressor is controlled based on the control command, and then the second temperature information is collected. The second temperature information can be the temperature values ​​of the three regions mentioned above. Based on the temperature value, it is determined which situation needs to be addressed and control measures are required. It is worth noting that when the dual-suction compressor control command is obtained, the temperature acquisition device can collect the second temperature information after a preset time interval or in real time after the preset time interval. There is no limitation on the time of acquisition. If, after cooling the two cooling zones, it is found that both zones are still above their upper temperature limit, then the temperature of the ambient area obtained at this time is taken as the first ambient temperature, and the control command for the dual-suction compressor based on the first ambient temperature is continued. Conversely, if it is found that only one of the two cooling zones has a temperature above its upper temperature limit, the dual-suction compressor will be controlled based on the temperature value of that cooling zone (the cooling zone above its upper temperature limit) in the second temperature information. That is, when the temperature of any room is above its upper temperature limit, the refrigeration and freezing zones can cool down simultaneously (generally, the area above the upper temperature limit cools down faster, while the area below the upper temperature limit remains the same or cools down slowly). Thus, the temperature control of the refrigeration and freezing zones can be achieved based on the dual-suction compressor and the temperature to ensure the cooling effect of the refrigeration and freezing zones.

[0065] In one embodiment, a temperature control method is provided, applied to a cryogenic refrigeration system. The cryogenic refrigeration system includes a dual-suction compressor and a temperature acquisition device. The method acquires first temperature information collected by the temperature acquisition device, wherein the first temperature information includes a first refrigeration temperature of a refrigeration zone, a first freezing temperature of a freezing zone, and a first ambient temperature of an ambient zone. When the first refrigeration temperature is greater than a preset upper limit temperature for refrigeration, or the first freezing temperature is greater than a preset upper limit temperature for freezing, a control command for the dual-suction compressor is determined based on the first ambient temperature. The method then acquires second temperature information collected by the temperature acquisition device under the control command for the dual-suction compressor, and controls the dual-suction compressor based on the second temperature information to achieve temperature control of the refrigeration zone and the freezing zone. This temperature control method is applied to systems including dual-suction compressors (which, by their very nature, can form a refrigeration zone). This low-temperature refrigeration system uses two independent refrigeration circuits (one for the refrigeration zone and one for the freezing zone) and a temperature acquisition device. It determines the control command for the dual-suction compressor based on the first temperature information and acquires the second temperature information under the control of the dual-suction compressor. This allows for temperature control of both the refrigeration and freezing zones, avoiding the need for two separate low-temperature refrigeration systems. On one hand, the design of the low-temperature refrigeration system uses the second temperature information to control the dual-suction compressor, ensuring accurate temperature control in both zones. On the other hand, the low-temperature refrigeration system uses only one dual-suction compressor to control the temperature of both zones, reducing the need for single-suction compressors and thus lowering the cost of temperature control.

[0066] Furthermore, based on the first embodiment of the temperature control method of this application described above, a second embodiment of the temperature control method of this application is proposed. The second temperature information includes the second refrigeration temperature of the refrigeration zone, the second freezing temperature of the freezing zone, and the second ambient temperature of the ambient zone. The step of controlling the dual-suction compressor according to the second temperature information includes:

[0067] Step S31: When the second refrigeration temperature is greater than the upper limit temperature of refrigeration, or the second freezing temperature is greater than the upper limit temperature of freezing, the second ambient temperature is taken as the first ambient temperature, and the step of determining the control command of the dual-suction compressor based on the first ambient temperature is executed.

[0068] Step S32: When the second refrigeration temperature is greater than the preset lower limit refrigeration temperature and the second freezing temperature is less than or equal to the preset lower limit freezing temperature, the speed of the dual-suction compressor is reduced according to the preset speed reduction command, wherein the lower limit refrigeration temperature is less than the upper limit refrigeration temperature and the lower limit freezing temperature is less than the upper limit freezing temperature.

[0069] Step S33: When the second refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature and the second freezing temperature is greater than the preset lower limit freezing temperature, the double-suction compressor is controlled to increase its speed according to the preset speed increase command.

[0070] Step S34: When the second refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature and the second freezing temperature is less than or equal to the preset lower limit freezing temperature, control the dual-suction compressor to stop.

[0071] In this embodiment, under the control command of the dual-suction compressor, the temperature acquisition unit collects second temperature information, including the second refrigeration temperature of the refrigeration zone, the second freezing temperature of the freezing zone, and the second ambient temperature of the ambient zone. It then judges the three real-time temperatures. When the second refrigeration temperature is greater than the upper limit temperature of the refrigeration zone, or the second freezing temperature is greater than the upper limit temperature of the freezing zone (meaning one of the two refrigeration zones has a temperature higher than its own upper limit), the second ambient temperature is taken as the first ambient temperature, and the step of determining the dual-suction compressor control command based on the first ambient temperature is executed. That is, the judgment and control continue until at least one of the two refrigeration zones reaches its lower limit temperature. Specifically, if the second refrigeration temperature is greater than the preset lower limit temperature of the refrigeration zone and the second freezing temperature is less than or equal to the preset lower limit temperature of the freezing zone, or if the second refrigeration temperature is less than or equal to the preset lower limit temperature of the refrigeration zone and the second freezing temperature is greater than the preset lower limit temperature of the freezing zone, or if the second refrigeration temperature is less than or equal to the preset lower limit temperature of the refrigeration zone and the second freezing temperature is less than or equal to the preset lower limit temperature of the freezing zone, step S31 will not continue. When the second refrigeration temperature is less than or equal to the lower limit of the refrigeration temperature, and the second freezing temperature is less than or equal to the lower limit of the freezing temperature, it is known that both refrigeration zones have reached the required cooling effect, and the dual-suction compressor will be stopped, i.e., cooling will cease. When the second refrigeration temperature is greater than the lower limit of the refrigeration temperature, and the second freezing temperature is less than or equal to the preset lower limit of the freezing temperature, or when the second refrigeration temperature is less than or equal to the preset lower limit of the refrigeration temperature, and the second freezing temperature is greater than the lower limit of the freezing temperature, the zone with the temperature higher than the lower limit of the refrigeration temperature will be controlled. That is, assuming the second refrigeration temperature is greater than the lower limit of the refrigeration temperature, and the second freezing temperature is less than or equal to the lower limit of the freezing temperature, the dual-suction compressor will be controlled based on the second freezing temperature. This means that the dual-suction compressor will be controlled to reduce its speed according to the preset speed reduction command. The preset speed reduction command means reducing the speed of the dual-suction compressor to cool the refrigeration zone while maintaining or reducing the temperature of the freezing zone at a low rate. Conversely, the dual-suction compressor will be controlled based on the second freezing temperature, allowing it to cool only one of the refrigeration zones. This means that a preset speed-up command will increase the compressor's speed to cool the freezing zone while maintaining or lowering the temperature of the refrigeration zone at a slower rate. Because of the dual-suction compressor, two independent refrigeration circuits can be formed, preventing both circuits from operating at the same temperature simultaneously, thus ensuring effective cooling for both the refrigeration and freezing zones.It is worth noting that the lower limit temperature for refrigeration is lower than the upper limit temperature for refrigeration, and the lower limit temperature for freezing is lower than the upper limit temperature for freezing. The setting requirements (relative size) of freezing and refrigeration temperatures are set according to the actual situation. Alternatively, the upper and lower limit temperatures can be set as a range or as a single value, which is not limited here.

[0072] In one embodiment, after the step of controlling the dual-suction compressor based on the second temperature information, at least one of the following is included:

[0073] Step S35: When the dual-suction compressor is under speed reduction control, after the speed reduction control is obtained, the temperature collected by the temperature acquisition device is used as the second temperature information, and when the second refrigeration temperature in the second temperature information is less than or equal to the lower limit temperature of refrigeration, the dual-suction compressor is controlled to stop.

[0074] Step S36: When the dual-suction compressor is under speed increase control, after the speed increase control is obtained, the temperature collected by the temperature acquisition device is used as the second temperature information, and when the second freezing temperature in the second temperature information is less than or equal to the lower freezing limit temperature, the dual-suction compressor is controlled to stop.

[0075] In this embodiment, the control process of the dual-suction compressor based on the second freezing temperature includes two steps. First, when the second refrigeration temperature is greater than the lower limit of the refrigeration temperature and the second freezing temperature is less than or equal to the lower limit of the freezing temperature, it is necessary to cool down the refrigeration area while maintaining or reducing the temperature of the freezing area at a low rate. Then, the dual-suction compressor will be controlled to reduce its speed based on a preset speed reduction command. After the speed reduction control is obtained, the temperature collected by the temperature acquisition device is used as the second temperature information. After obtaining the second temperature information, the step of controlling the dual-suction compressor based on the second temperature information is re-executed. When the second refrigeration temperature is less than or equal to the preset lower limit of the refrigeration temperature and the second freezing temperature is less than or equal to the preset lower limit of the freezing temperature, the dual-suction compressor is controlled to stop. At this time, after obtaining the speed reduction control, the temperature collected by the temperature acquisition device as the second temperature information can also be collected at certain time intervals. Secondly, if the second refrigeration temperature is less than or equal to the lower limit of the refrigeration temperature, and the second freezing temperature is greater than the lower limit of the freezing temperature, meaning the freezing zone needs to be cooled while maintaining or lowering the refrigeration zone temperature at a low rate, then the dual-suction compressor will be controlled to increase its speed based on a preset speed-up command. The temperature collected by the temperature sensor after the speed-up control is obtained will be used as the second temperature information. After obtaining the second temperature information, the step of controlling the dual-suction compressor based on the second temperature information will be re-executed. When the second refrigeration temperature is less than or equal to the preset lower limit of the refrigeration temperature, and the second freezing temperature is less than or equal to the preset lower limit of the freezing temperature, the dual-suction compressor will be stopped. At this point, the temperature collected by the temperature sensor after the speed-down control can also be used as the second temperature information at certain intervals. (See reference...) Figure 7 , Figure 7 This is a schematic diagram of the temperature control method of this application. Since the speed of the dual-suction compressor has a greater impact on the refrigeration capacity than on the cooling capacity of the refrigerator, when the temperature of the refrigerator compartment (i.e., the second refrigerator temperature) reaches the lower limit of the temperature range first, the speed of the dual-suction compressor is increased while refrigeration is carried out, which accelerates the refrigeration speed so that the freezer compartment can quickly reach the corresponding lower limit of the temperature range. The refrigeration compartment is not greatly affected by the speed, so the temperature will not drop much, and eventually the compressor will stop. When the temperature of the freezer compartment (i.e., the second freezer temperature) reaches the lower limit of the temperature range first, the speed of the dual-suction compressor is decreased while refrigeration is carried out. Since the speed has a greater impact on the refrigeration, the refrigeration cooling will be slower or kept constant, while the refrigeration compartment is less affected by the speed and will continue to cool down at the previous rate. At this time, the cooling rate is greater than that of the freezer, and the compressor will stop after reaching the lower limit of the temperature range. Thus, the temperature control of the refrigeration and freezer compartments can be achieved efficiently and accurately.

[0076] Furthermore, based on the first and / or second embodiments of the temperature control method of this application described above, a third embodiment of the temperature control method of this application is proposed, comprising the step of determining the control command for the dual-suction compressor based on the first ambient temperature, including:

[0077] Step S21: Determine the speed value corresponding to the first ambient temperature from the preset temperature-speed correspondence table as the required speed value, and use the required speed value as the control command for the dual-suction compressor.

[0078] In this embodiment, when the temperatures of both cooling zones are higher than their respective upper temperature limits, the control command for the dual-suction compressor is determined based on the first ambient temperature. The required speed value corresponding to the first ambient temperature can be directly determined using a preset temperature-speed correspondence table. This required speed value is then used as the control command for the dual-suction compressor. In other words, the preset temperature-speed correspondence table defines the speed value corresponding to the first ambient temperature. It's worth noting that the first refrigeration temperature and the first freezing temperature can also be considered together. For example, if the first freezing temperature is higher (compared to the preset upper limit freezing temperature), the required speed value can be appropriately increased; if the first refrigeration temperature is higher (compared to the preset upper limit refrigeration temperature), the required speed value can be appropriately decreased. Alternatively, the relationship between the first refrigeration temperature, the first freezing temperature, and their respective upper limits can be considered simultaneously to adjust the required speed value. This allows for efficient and rapid cooling of both cooling zones based on the required speed value, ensuring effective cooling.

[0079] In one embodiment, after the step of acquiring the first temperature information collected by the temperature sensor, the method includes:

[0080] Step S101: When the first refrigeration temperature is greater than the preset lower limit refrigeration temperature and the first freezing temperature is less than or equal to the preset lower limit freezing temperature, the speed of the dual-suction compressor is reduced according to the preset speed reduction command.

[0081] Step S102: When the first refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature and the first freezing temperature is greater than the preset lower limit freezing temperature, the speed of the dual-suction compressor is increased according to the preset speed increase command.

[0082] In step S103, when the first refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature and the first freezing temperature is less than or equal to the preset lower limit freezing temperature, the dual-suction compressor is controlled to stop.

[0083] In this embodiment, after obtaining the first temperature information, besides the case where the first refrigeration temperature is greater than the preset upper limit refrigeration temperature and the first freezing temperature is greater than the preset upper limit freezing temperature, there are also cases where the first refrigeration temperature is greater than the preset lower limit refrigeration temperature and the first freezing temperature is less than or equal to the preset lower limit freezing temperature. In this case, the dual-suction compressor is controlled to reduce its speed according to a preset speed reduction command. Alternatively, if the first refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature and the first freezing temperature is greater than the preset lower limit freezing temperature, meaning only one refrigeration zone needs to be refrigerated, then the speed will be reduced according to the first freezing temperature or the first freezing temperature. The dual-suction compressor is controlled by executing steps S35 and S36 (i.e., controlling the dual-suction compressor to stop when the second refrigeration temperature in the final second temperature information is less than or equal to the lower limit temperature of the refrigeration, or controlling the dual-suction compressor to stop when the second freezing temperature in the second temperature information is less than or equal to the lower limit temperature of the freezing). At this point, the temperature values ​​are the first refrigeration temperature and the first freezing temperature (i.e., directly replacing the second refrigeration temperature and the second freezing temperature in steps S32-S34 with the first refrigeration temperature and the first freezing temperature). The instruction to stop the two refrigeration zones is given when both temperature values ​​are less than their respective lower limits. When the first refrigeration temperature is less than or equal to the preset lower limit temperature of the refrigeration, and the first freezing temperature is less than or equal to the preset lower limit temperature of the freezing (i.e., neither zone needs refrigeration), the dual-suction compressor is controlled to stop, meaning there is no need to start the dual-suction compressor, thus ensuring the intelligence and accuracy of the entire temperature control process.

[0084] Furthermore, refer to Figure 8 , Figure 8 This is a schematic diagram of the controller structure of the hardware operating environment involved in the embodiments of the present invention.

[0085] like Figure 8 As shown, the controller may include: a processor 0003, such as a central processing unit (CPU), a communication bus 0001, an acquisition interface 0002, a processing interface 0004, and a memory 0005. The communication bus 0001 is used to enable communication between these components. The acquisition interface 0002 may include an information acquisition device or acquisition unit, such as a computer; optionally, the acquisition interface 0002 may also include a standard wired interface or a wireless interface. The processing interface 0004 may optionally include a standard wired interface or a wireless interface. The memory 0005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 0005 may also be a storage device independent of the aforementioned processor 0003.

[0086] Those skilled in the art will understand that Figure 8 The structure shown does not constitute a limitation on the controller and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0087] like Figure 8 As shown, the memory 0005, which serves as a computer storage medium, may include an operating system, an acquisition interface module, a processing interface module, and a current detection program for power devices executed by a controller.

[0088] exist Figure 8 In the controller shown, the communication bus 0001 is mainly used to realize the connection and communication between components; the acquisition interface 0002 is mainly used to connect to the backend server and communicate with the backend server; the processing interface 0004 is mainly used to connect to the deployment end (user end) and communicate with the deployment end; the processor 0003 and the memory 0005 in the controller of the present invention can be set in the controller. The controller calls the current detection program of the power device stored in the memory 0005 through the processor 0003 and executes the current detection circuit of the power device provided in the embodiment of the present invention.

[0089] The present invention also provides a temperature controller, which is connected to the control terminal of a dual-suction compressor and a temperature acquisition device, as described above. Figure 9 , Figure 9 This is a schematic diagram of the temperature controller module of the present invention. The temperature controller includes:

[0090] Information acquisition module A01 is used to acquire the first temperature information collected by the temperature acquisition device, wherein the first temperature information includes the first refrigeration temperature of the refrigeration area, the first freezing temperature of the freezing area, and the first ambient temperature of the ambient area.

[0091] The first control module A02 is used to determine the control command of the dual-suction compressor based on the first ambient temperature when the first refrigeration temperature is greater than the preset upper limit temperature for refrigeration or the first freezing temperature is greater than the preset upper limit temperature for freezing.

[0092] The second control module A03 is used to acquire second temperature information by the temperature acquisition device under the control command of the dual-suction compressor, and control the dual-suction compressor according to the second temperature information to achieve temperature control of the refrigeration area and the freezing area.

[0093] The methods executed by the above-mentioned program modules can be referred to in the various embodiments of the temperature control method of the present invention, and will not be repeated here.

[0094] The present invention also provides a computer-readable storage medium.

[0095] The present invention provides a computer-readable storage medium storing a temperature control program executed by a controller, which, when executed by a processor, implements the steps of the temperature control method described above.

[0096] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the data management method described above.

[0097] The computer program product provided in this application can solve the technical problem of high cost in implementing temperature control. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the temperature control method provided in the above embodiments, and will not be repeated here.

[0098] Based on the first, second, and / or third embodiments of the temperature control method of this application, this application also proposes a first embodiment of a cryogenic refrigeration system, referring to... Figure 10 , Figure 10 This is a schematic diagram of a low-temperature refrigeration system according to the present invention. The low-temperature refrigeration system includes a temperature controller 20, a dual-suction compressor 10, a temperature acquisition device 30, a refrigeration control module 40, and a freezing control module 50. The output terminal of the dual-suction compressor 10 is connected to the input terminals of the refrigeration control module 40 and the freezing control module 50. The first input terminal of the dual-suction compressor 10 is connected to the output terminal of the refrigeration control module 40, and the second input terminal of the dual-suction compressor 10 is connected to the output terminal of the freezing control module 50. The temperature controller 20 is connected to the control terminal of the dual-suction compressor 10 and the temperature acquisition device 30. The temperature controller 20 performs the temperature control method described above.

[0099] It is worth noting that, according to the cryogenic refrigeration system of this application embodiment, the temperature controller 20 in the cryogenic refrigeration system executes a temperature control program: acquiring first temperature information collected by the temperature acquisition device 30, wherein the first temperature information includes a first refrigeration temperature of the refrigeration area, a first freezing temperature of the freezing area, and a first ambient temperature of the ambient area; when the first refrigeration temperature is greater than a preset upper limit temperature for refrigeration and the first freezing temperature is greater than a preset upper limit temperature for freezing, determining a dual-suction compressor control command based on the first ambient temperature; upon acquiring the dual-suction compressor control command, the temperature acquisition device collects second temperature information and controls the dual-suction compressor 10 based on the second temperature information to achieve temperature control of the refrigeration area and the freezing area. On the one hand, under the design of the cryogenic refrigeration system, controlling the dual-suction compressor through the second temperature information ensures the accuracy of temperature control of the refrigeration area and the freezing area; on the other hand, the cryogenic refrigeration system uses only one dual-suction compressor 10 to achieve temperature control of the refrigeration area and the freezing area, which can reduce the use of single-suction compressors and thus reduce the implementation cost of temperature control.

[0100] The composition of the refrigeration control module 40 and the freezing control module 50 can be the same as that of commonly used refrigeration control modules 40 and refrigeration control modules 50. The composition of the two modules is not limited here. The temperature acquisition device 30 can be a commonly used temperature sensor, etc. The entire low-temperature refrigeration system may also include other component modules, which will not be described one by one here.

[0101] Furthermore, based on the first embodiment of the cryogenic refrigeration system of this application described above, a second embodiment of the cryogenic refrigeration system of this application is proposed, with reference to... Figure 11 , Figure 11 This is a connection diagram of the cryogenic refrigeration system of the present invention. The dual-suction compressor 10 includes an exhaust port 11. The cryogenic refrigeration system includes:

[0102] Condenser 60, the condenser inlet of condenser 60 is connected to exhaust port 11;

[0103] Filter 70, the filter inlet of filter 70 is connected to the condenser outlet of condenser 60;

[0104] Diverter 83 has its diversion inlet connected to the filter outlet of filter 70, its first diversion outlet connected to the input of refrigeration control module 40, and its second diversion outlet connected to the input of freezer control module 50.

[0105] In this embodiment, the low-temperature refrigeration system includes a condenser 60, a filter 70, and a distributor 83 (using its distribution effect to avoid the problem of the three-way valve not being able to distribute the flow) to output the medium refrigerated by the dual-suction compressor 10 to the refrigeration control module 40 and the freezing control module 50 through the above devices. The condenser 60, filter 70, and distributor 83 can use existing instruments, which are not limited here. At the same time, the connection from the dual-suction compressor 10 to the refrigeration control module 40 and the freezing control module 50 may also include other devices, which will not be described one by one here.

[0106] Furthermore, based on the first and / or second embodiments of the cryogenic refrigeration system of this application described above, a third embodiment of the cryogenic refrigeration system of this application is proposed, wherein the dual-suction compressor 10 includes a first return air port 12, and the refrigeration control module 40 includes:

[0107] Refrigerated capillary tube 41, the refrigerated inlet of refrigerated capillary tube 41 is connected to the first diversion outlet;

[0108] The refrigerated evaporator 42 has its refrigerated evaporation inlet connected to the refrigerated outlet of the refrigerated capillary tube 41.

[0109] The auxiliary return pipe 43 has its first end connected to the refrigeration evaporation outlet of the refrigeration evaporator 42, and its second end connected to the first return port 12.

[0110] In one embodiment, the dual-suction compressor 10 includes a second return air port 12, and the refrigeration control module 50 includes:

[0111] The freezing capillary 51 has a freezing inlet connected to the second diversion outlet.

[0112] The refrigeration evaporator 52 has its refrigeration inlet connected to the refrigeration outlet of the refrigeration capillary tube 51.

[0113] The main return pipe 53 has its first end connected to the refrigeration evaporation outlet of the refrigeration evaporator 52, and its second end connected to the second return port 13.

[0114] In this embodiment, the refrigeration control module 40 includes a refrigeration capillary tube 41, a refrigeration evaporator 42, and a secondary return pipe 43, to realize the refrigeration function of the refrigeration control module 40 based on the above devices. The freezing control module 50 includes a freezing capillary tube 51, a freezing evaporator 52, and a main return pipe 53, to realize the freezing function of the freezing control module 50 based on the above devices. Of course, the two modules may also include more other devices, such as using a refrigeration or freezing fan to replace the functions of the refrigeration evaporator 42 and the freezing evaporator 52, etc., which will not be described in detail here. The dual-suction compressor 10 enables simultaneous refrigeration control of the refrigeration control module 40 and the freezing control module 50, ensuring a constant temperature in both the refrigeration and freezing compartments with minimal temperature fluctuations. Furthermore, it prevents a rapid temperature rise in the freezing compartment when the refrigeration door is opened, thus meeting user requirements. Simultaneously, the refrigerant is further throttled and depressurized through refrigeration and freezing capillary tubes to a low-temperature, low-pressure, gas-liquid two-phase saturated state, which is then distributed to the refrigeration and freezing evaporators for evaporation, heat absorption, and refrigeration. In the freezing compartment, low-pressure gaseous refrigerant exits the freezing evaporator and returns to the dual-suction compressor cavity via the main return pipe. In the refrigeration compartment, medium-pressure gaseous refrigerant exits the refrigeration evaporator and returns to the dual-suction compressor cavity via the second return pipe. This mixing of medium-pressure and low-pressure gaseous refrigerant increases the overall system's low-pressure level, reducing the system's compression ratio and thus lowering energy consumption, achieving energy savings.

[0115] The cryogenic refrigeration system provided in this application can solve the technical problem of high cost in achieving temperature control. Compared with the prior art, the beneficial effects of the cryogenic refrigeration system provided in this application are the same as those of the temperature control method provided in the above embodiments, and will not be repeated here.

[0116] This application also provides a cryogenic refrigeration cabinet, which includes the aforementioned cryogenic refrigeration system.

[0117] It is worth noting that the cryogenic refrigeration system can be installed on a cryogenic refrigeration cabinet (which can be used in commercial kitchens or other fields, and is not limited here) to solve the technical problem of high cost in achieving temperature control. It is also worth noting that the cryogenic refrigeration cabinet can include other hardware, which will not be described in detail here. The entire cryogenic refrigeration system can be installed on the cryogenic refrigeration cabinet or on other products, and is not limited here.

[0118] The cryogenic refrigerator provided in this application can solve the technical problem of high cost in achieving temperature control. Compared with the prior art, the beneficial effects of the cryogenic refrigerator provided in this application are the same as those of the temperature control method provided in the above embodiments, and will not be repeated here.

[0119] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A temperature control method characterized by, The temperature control method is applied to a cryogenic refrigeration system, which includes a dual-suction compressor and a temperature acquisition device. The temperature control method includes: The temperature information collected by the temperature acquisition device is obtained, wherein the first temperature information includes the first refrigeration temperature of the refrigeration area, the first freezing temperature of the freezing area, and the first ambient temperature of the ambient area. When the first refrigeration temperature is greater than the preset upper limit temperature for refrigeration, or when the first freezing temperature is greater than the preset upper limit temperature for freezing, the control command for the dual-suction compressor is determined based on the first ambient temperature. The temperature acquisition device collects the second temperature information under the control command of the dual-suction compressor, and controls the dual-suction compressor according to the second temperature information to achieve temperature control of the refrigeration area and the freezing area.

2. The temperature control method as described in claim 1, characterized in that, The second temperature information includes the second refrigeration temperature of the refrigeration zone, the second freezing temperature of the freezing zone, and the second ambient temperature of the ambient zone. The step of controlling the dual-suction compressor based on the second temperature information includes: When the second refrigeration temperature is greater than the upper limit of the refrigeration temperature, or the second freezing temperature is greater than the upper limit of the freezing temperature, the second ambient temperature is taken as the first ambient temperature, and the step of determining the dual-suction compressor control command based on the first ambient temperature is executed. When the second refrigeration temperature is greater than the preset lower refrigeration temperature and the second freezing temperature is less than or equal to the preset lower freezing temperature, the speed of the dual-suction compressor is reduced according to the preset speed reduction command, wherein the lower refrigeration temperature is less than the upper refrigeration temperature and the lower freezing temperature is less than the upper freezing temperature. When the second refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature, and the second freezing temperature is greater than the preset lower limit freezing temperature, the dual-suction compressor is controlled to increase its speed according to the preset speed increase command. When the second refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature, and the second freezing temperature is less than or equal to the preset lower limit freezing temperature, the dual-suction compressor is controlled to stop.

3. The temperature control method as described in claim 2, characterized in that, After the step of controlling the dual-suction compressor based on the second temperature information, at least one of the following is included: When the dual-suction compressor is under speed reduction control, after the speed reduction control is obtained, the temperature collected by the temperature acquisition device is used as the second temperature information, and when the second refrigeration temperature in the second temperature information is less than or equal to the lower limit refrigeration temperature, the dual-suction compressor is controlled to stop. When the dual-suction compressor is under speed control, after the speed control is obtained, the temperature collected by the temperature acquisition device is used as the second temperature information, and when the second freezing temperature in the second temperature information is less than or equal to the lower freezing limit temperature, the dual-suction compressor is controlled to stop.

4. The temperature control method according to any one of claims 1 to 3, characterized in that, The step of determining the control command for the dual-suction compressor based on the first ambient temperature includes: The speed value corresponding to the first ambient temperature is determined as the required speed value in the preset temperature-speed correspondence table, and the required speed value is used as the control command for the dual-suction compressor.

5. The temperature control method according to any one of claims 1 to 3, characterized in that, After the step of acquiring the first temperature information collected by the temperature acquisition device, the following steps are included: When the first refrigeration temperature is greater than the preset lower limit refrigeration temperature and the first freezing temperature is less than or equal to the preset lower limit freezing temperature, the dual-suction compressor is controlled to reduce its speed according to the preset speed reduction command. When the first refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature, and the first freezing temperature is greater than the preset lower limit freezing temperature, the dual-suction compressor is controlled to increase its speed according to the preset speed increase command. When the first refrigeration temperature is less than or equal to the preset lower limit refrigeration temperature, and the first freezing temperature is less than or equal to the preset lower limit freezing temperature, the dual-suction compressor is controlled to stop.

6. A cryogenic refrigeration system, characterized in that, The low-temperature refrigeration system includes a temperature controller, a dual-suction compressor, a temperature sensor, a refrigeration control module, and a freezing control module. The output terminal of the dual-suction compressor is connected to the input terminals of the refrigeration control module and the freezing control module. The first input terminal of the dual-suction compressor is connected to the output terminal of the refrigeration control module, and the second input terminal of the dual-suction compressor is connected to the output terminal of the freezing control module. The temperature controller is connected to the control terminal of the dual-suction compressor and the temperature sensor. The temperature controller performs the temperature control method as described in any one of claims 1 to 5.

7. The cryogenic refrigeration system as described in claim 6, characterized in that, The dual-suction compressor includes an exhaust port, and the cryogenic refrigeration system includes: A condenser, wherein the condenser inlet is connected to the exhaust port; A filter, wherein the filter inlet is connected to the condenser outlet; The distributor has a diversion inlet connected to the filter outlet of the filter, a first diversion outlet connected to the input of the refrigeration control module, and a second diversion outlet connected to the input of the freezing control module.

8. The cryogenic refrigeration system as described in claim 7, characterized in that, The dual-suction compressor includes a first return air port, and the refrigeration control module includes: A refrigerated capillary tube, wherein the refrigerated inlet of the refrigerated capillary tube is connected to the first diversion outlet; A refrigerated evaporator, wherein the refrigerated evaporation inlet of the refrigerated evaporator is connected to the refrigerated outlet of the refrigerated capillary tube; A secondary return gas pipe, the first end of which is connected to the refrigeration evaporation outlet of the refrigeration evaporator, and the second end of which is connected to the first return gas port.

9. The cryogenic refrigeration system as described in claim 7, characterized in that, The dual-suction compressor includes a second return air port, and the refrigeration control module includes: A cryocapillary, wherein the cryocapillary inlet is connected to the second diversion outlet; A refrigerated evaporator, wherein the refrigeration inlet of the refrigerated evaporator is connected to the refrigeration outlet of the refrigerated capillary; The main return gas pipe has its first end connected to the refrigeration evaporation outlet of the refrigeration evaporator, and its second end connected to the second return gas port.

10. A low-temperature refrigeration cabinet, characterized in that, The cryogenic refrigeration cabinet includes the cryogenic refrigeration system according to any one of claims 6 to 9.

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