Temperature control method and device for freeze thawing machine, freeze thawing machine and computer readable storage medium

Abstract

The invention relates to the technical field of freeze-thaw machine control, and discloses a temperature control method for a freeze-thaw machine, which comprises the following steps: obtaining a no-load cooling rate critical value of the freeze-thaw machine in a no-load state in a test stage; in the operation stage of the freezing and thawing machine, the initial temperature and the target temperature of the freezing and thawing machine are obtained; and according to the corresponding relation between the initial temperature and the target temperature and the no-load cooling rate critical value, the real-time outlet temperature of the temperature control unit is controlled, so that the real-time outlet temperature reaches the target temperature. The method can avoid the situation that the freezing and thawing machine is too high in cooling rate, stable cooling is achieved, and the activity of the stock solution is improved. The invention further discloses a temperature control device for the freeze thawing machine, the freeze thawing machine and a computer readable storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of freeze-thaw machine control, for example, to a temperature control method and device for a freeze-thaw machine, a freeze-thaw machine, and a computer-readable storage medium. Background Art

[0002] At present, a freeze-thaw machine is a large device that realizes rapid freezing or melting of a stock solution through a contact-type laminate. The freeze-thaw machine mainly includes a secondary refrigerant passage and a refrigerant passage. Its working principle is that the refrigerant cools the secondary refrigerant, and the electric heater heats the secondary refrigerant. After heating, the secondary refrigerant heats or cools the freeze-thaw cold plate to achieve heat or cold transfer. After reaching the target temperature during the above-mentioned heating or cooling, temperature control is performed to achieve constant temperature, so as to realize freezing or thawing of the stock solution.

[0003] To reach the target temperature, the temperature increase and decrease logic adopted by the related technology is as follows: set the target temperature; judge the magnitude of the difference between the current temperature and the target temperature; if the difference is less than zero, run the heating program; if the difference is greater than zero, run the cooling program to ensure reaching the target temperature in the shortest time.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related technology:

[0005] Although the related technology can quickly freeze the stock solution, in the actual freezing process of the stock solution, too fast a cooling rate will damage the activity of the drug stock solution protein, resulting in unqualified activity after melting. In addition, through experimental tests, it is known that during the cooling process of the freeze-thaw machine, the lower the actual temperature, the slower the cooling speed, which will lead to a phenomenon of first fast and then slow during the cooling process. It can be seen that the temperature increase and decrease logic adopted by the related technology has problems of too fast a cooling rate and unstable cooling process, affecting the activity of the stock solution.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] The embodiments of the present disclosure provide a temperature control method and device for a freeze-thaw machine, a freeze-thaw machine, and a computer-readable storage medium to avoid too fast a cooling rate of the freeze-thaw machine, achieve stable cooling, and improve the activity of the stock solution.

[0009] In some embodiments, the method includes: obtaining a critical value of the no-load cooling rate of the freeze-thaw machine in the no-load state during the test phase; during the operation phase of the freeze-thaw machine, obtaining the initial temperature and the target temperature of the freeze-thaw machine; and controlling the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate, so that the real-time outlet temperature reaches the target temperature.

[0010] In some embodiments, obtaining the critical value of the no-load cooling rate of the freeze-thaw machine in the no-load state during the test phase includes: during the test phase, obtaining the corresponding relationship between the outlet temperature of the temperature control unit of the freeze-thaw machine in the no-load state and time; according to the corresponding relationship between the outlet temperature of the temperature control unit of the freeze-thaw machine in the no-load state and time, obtaining the minimum value of the absolute value of the no-load cooling rate in different time periods; and determining the minimum value of the absolute value of the no-load cooling rate in different time periods as the critical value of the no-load cooling rate in the corresponding time periods.

[0011] In some embodiments, the no-load cooling rate in different time periods is obtained in the following manner: according to the corresponding relationship between the outlet temperature of the temperature control unit of the freeze-thaw machine in the no-load state and time, obtaining the no-load cooling curve of the freeze-thaw machine; according to the no-load cooling curve, obtaining the no-load cooling slope in different time periods; and determining the no-load cooling slope in each time period as the no-load cooling rate in the corresponding time period.

[0012] In some embodiments, controlling the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate includes: obtaining the temperature control duration t corresponding to the real-time outlet temperature s ; according to the temperature control duration t s , determining the critical value of the target no-load cooling rate in the time period corresponding to the temperature control duration t s ; and controlling the real-time outlet temperature T s to decrease in a manner not higher than the critical value of the target no-load cooling rate based on the difference between the initial temperature T0 and k*t m .

[0013] In some embodiments, it further includes: obtaining the output duty ratio of the heater; and adjusting the opening degree of the electronic expansion valve of the refrigeration system according to the output duty ratio of the heater so that the real-time outlet temperature is within the temperature threshold range.

[0014] In some embodiments, adjusting the opening degree of the electronic expansion valve of the refrigeration system according to the output duty ratio of the heater includes: in the case where the output duty ratio is greater than the upper threshold of the duty ratio, decreasing the opening degree of the electronic expansion valve to reduce the refrigeration capacity; and in the case where the output duty ratio is less than or equal to the lower threshold of the duty ratio, increasing the opening degree of the electronic expansion valve to increase the refrigeration capacity.

[0015] In some embodiments, the real-time outlet temperature of the temperature control unit is controlled according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate, including: performing proportional-integral-derivative control on the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate.

[0016] In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the temperature control method for the freeze-thaw machine as described above when running the program instructions.

[0017] In some embodiments, the freeze-thaw machine includes: a freeze-thaw machine body including a temperature control unit; the temperature control device for the freeze-thaw machine as described above, installed on the freeze-thaw machine body.

[0018] In some embodiments, the computer-readable storage medium stores program instructions, and when the program instructions are running, they are used to cause a computer to execute the temperature control method for the freeze-thaw machine as described above.

[0019] The temperature control method and device for the freeze-thaw machine, the freeze-thaw machine, and the computer-readable storage medium provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] After obtaining the critical value of the no-load cooling rate in the no-load state of the freeze-thaw machine during the test phase in the embodiments of the present disclosure, the initial temperature and the target temperature are obtained during the operation phase of the freeze-thaw machine. The real-time outlet temperature of the temperature control unit is controlled according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate. In this way, the real-time outlet temperature is always cooled smoothly with the critical value of the no-load cooling rate as the boundary, avoiding the actual cooling speed of the freeze-thaw machine exceeding the no-load cooling rate, which is beneficial to improving the reliability of the freeze-thaw process and at the same time improving the activity of the stock solution.

[0021] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a proportional limitation, and among them:

[0023] Figure 1 is a schematic diagram of the no-load cooling curve of a freeze-thaw machine provided by an embodiment of the present disclosure;

[0024] Figure 2 is a schematic diagram of a temperature control method for a freeze-thaw machine provided by an embodiment of the present disclosure;

[0025] Figure 3It is a schematic diagram of another temperature control method for a freeze-thaw machine provided by an embodiment of the present disclosure;

[0026] Figure 4 It is a schematic diagram of another temperature control method for a freeze-thaw machine provided by an embodiment of the present disclosure;

[0027] Figure 5 It is a schematic diagram of another temperature control method for a freeze-thaw machine provided by an embodiment of the present disclosure;

[0028] Figure 6 It is a schematic diagram of another temperature control method for a freeze-thaw machine provided by an embodiment of the present disclosure;

[0029] Figure 7 It is a schematic diagram of a temperature control device for a freeze-thaw machine provided by an embodiment of the present disclosure;

[0030] Figure 8 It is a schematic diagram of another temperature control device for a freeze-thaw machine provided by an embodiment of the present disclosure. Detailed implementation manners

[0031] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and illustration purposes and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0032] In the specification, claims and above-mentioned drawings of the embodiments of the present disclosure, terms such as "first", "second", etc. are used to distinguish similar objects and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0033] Unless otherwise specified, the term "plurality" means two or more.

[0034] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0035] The term "and / or" is a description of the association relationship of objects and indicates that three relationships can exist. For example, A and / or B means: A or B, or, A and B these three relationships.

[0036] The term "corresponding" may refer to an association relationship or a binding relationship. That A corresponds to B means that there is an association relationship or a binding relationship between A and B.

[0037] In an embodiment of the present disclosure, the freeze-thaw machine includes a temperature control unit, a heater, and a refrigeration system. The temperature control unit is used to meet the temperature control of the intermittent reactor or the heating, cooling, constant temperature, and distillation of a continuous process, and is particularly suitable for process control with heat absorption or heat release during the reaction process. During the operation of the temperature control unit, the freeze-thaw machine can assist the temperature rise and fall of the temperature control unit through the refrigeration system and the heater based on the on-site working conditions. The refrigeration system includes a compressor and an electronic expansion valve, and the electronic expansion valve can controllably adjust the opening degree to achieve the regulation of the refrigeration capacity of the refrigeration system.

[0038] Based on the above configuration of the freeze-thaw machine, combined with Figure 2 as shown, an embodiment of the present disclosure provides a temperature control method for a freeze-thaw machine, including:

[0039] S01, the freeze-thaw machine obtains the critical value of the no-load cooling rate of the freeze-thaw machine in the no-load state during the test stage.

[0040] S02, during the operation stage of the freeze-thaw machine, the freeze-thaw machine obtains the initial temperature and the target temperature of the freeze-thaw machine.

[0041] S03, the freeze-thaw machine controls the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate, so that the real-time outlet temperature reaches the target temperature.

[0042] By using the temperature control method for the freeze-thaw machine provided by the embodiment of the present disclosure, after obtaining the critical value of the no-load cooling rate of the freeze-thaw machine in the no-load state during the test stage, the initial temperature and the target temperature are obtained during the operation stage of the freeze-thaw machine. The real-time outlet temperature of the temperature control unit is controlled according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate. In this way, the real-time outlet temperature is always stably cooled with the critical value of the no-load cooling rate as the boundary, avoiding the actual cooling speed of the freeze-thaw machine exceeding the no-load cooling rate, which is beneficial to improving the reliability of the freeze-thaw process and at the same time improving the activity of the stock solution.

[0043] Optionally, combined with Figure 3 as shown, the freeze-thaw machine obtains the critical value of the no-load cooling rate of the freeze-thaw machine in the no-load state during the test stage, including:

[0044] S11, during the test stage, the freeze-thaw machine obtains the corresponding relationship between the outlet temperature of the temperature control unit of the freeze-thaw machine and time when the freeze-thaw machine is no-load.

[0045] In this step, the corresponding relationship between the outlet temperature of the temperature control unit of the freeze-thaw machine and time when the freeze-thaw machine is no-load can be reflected by the no-load cooling curve of the freeze-thaw machine. Combined with Figure 1As shown, the horizontal axis of the no-load cooling curve represents time, with the unit of min (minute), and the vertical axis represents the temperature value at the outlet of the temperature control unit when the freeze-thaw machine is in no-load (abbreviated as the temperature control outlet temperature), with the unit of °C (Celsius). In the time period of [0, 65] min, L1 represents the slope of the no-load cooling curve in the above-mentioned time period of [0, 65] min, that is, the no-load cooling rate at [0, 65] min. In the time period of (65, 180] min, L2 represents the slope of the no-load cooling curve in the above-mentioned time period of (65, 180] min, that is, the no-load cooling rate at (65, 180] min.

[0046] S12, the freeze-thaw machine obtains the minimum value of the absolute value of the no-load cooling rate in different time periods according to the corresponding relationship between the temperature at the outlet of the temperature control unit and time when the freeze-thaw machine is in no-load.

[0047] S13, the freeze-thaw machine determines that the minimum value of the absolute value of the no-load cooling rate in different time periods is the critical value of the no-load cooling rate for the corresponding time period.

[0048] In this way, since the cooling process of the freeze-thaw machine shows a trend of being fast first and then slow, therefore, the cooling process can be roughly divided into two or more time periods, and the cooling rate in the earlier time period is higher than that in the later time period. Based on this, in the test stage, the embodiments of the present disclosure first obtain the corresponding relationship between the temperature at the outlet of the temperature control unit and time when the freeze-thaw machine is in no-load, and then obtain the minimum value of the absolute value of the no-load cooling rate in different time periods according to the corresponding relationship between the temperature at the outlet of the temperature control unit and time when the freeze-thaw machine is in no-load. Finally, the minimum value of the absolute value of the no-load cooling rate obtained in different time periods is used as the critical value of the no-load cooling rate for the corresponding time period.

[0049] Optionally, as shown in Figure 4 the freeze-thaw machine obtains the no-load cooling rate in different time periods in the following manner:

[0050] S21, the freeze-thaw machine obtains the no-load cooling curve of the freeze-thaw machine according to the corresponding relationship between the temperature at the outlet of the temperature control unit and time when the freeze-thaw machine is in no-load.

[0051] S22, the freeze-thaw machine obtains the no-load cooling slopes in different time periods according to the no-load cooling curve.

[0052] S23, the freeze-thaw machine determines that the no-load cooling slope in each time period is the no-load cooling rate for the corresponding time period.

[0053] In this way, in the embodiments of the present disclosure, the no-load cooling curve of the freeze-thaw machine is first obtained according to the correspondence between the outlet temperature of the temperature control unit and time when the freeze-thaw machine is unloaded, and then the no-load cooling slope in different time periods is obtained according to the no-load cooling curve. The no-load cooling slope can accurately reflect the no-load cooling situation in each time period. Based on this, in the embodiments of the present disclosure, the no-load cooling slope in each time period is used as the no-load cooling rate in the corresponding time period, providing accurate and reliable data support for the subsequent confirmation of the critical value of the no-load cooling rate.

[0054] In a specific example. Combining Figure 1 As shown, the inclination angle corresponding to the slope of the no-load cooling curve is within the range. In the time period of [0, 65] min, the temperature at the outlet of the temperature control shows a cooling trend that is first fast and then slow. The no-load cooling rate is negative, and the no-load cooling rate L1 gradually decreases with the increase of time. In the time period of (65, 180] min, the increasing trend of the temperature at the outlet of the temperature control is extremely slow, and the cooling rate L2 of the outlet temperature of the no-load cooling curve approaches zero in the time period close to 180 min. It can be seen from this that in the time period of [0, 65] min, the minimum value of the no-load cooling rate is approximately at the time corresponding to 65 s, and the time corresponding to 65 min is the minimum value of the absolute value of the no-load cooling rate in the time period of [0, 65] min. In the time period of (65, 180] min, the increasing trend of the temperature at the outlet of the temperature control is extremely slow, which is not considered here.

[0055] Optionally, combining Figure 5 As shown, the freeze-thaw machine controls the real-time outlet temperature of the temperature control unit according to the correspondence between the initial temperature and the target temperature and the critical value of the no-load cooling rate, including:

[0056] S31, the freeze-thaw machine obtains the temperature control duration t corresponding to the real-time outlet temperature s .

[0057] S32, the freeze-thaw machine determines the critical value of the target no-load cooling rate in the time period corresponding to the temperature control duration t s according to the temperature control duration t s .

[0058] S33, the freeze-thaw machine controls the real-time outlet temperature T s to cool down in a manner not higher than the critical value of the target no-load cooling rate based on the difference between the initial temperature T0 and k * t m .

[0059] In this way, after the embodiments of the present disclosure obtain the temperature control duration corresponding to the real-time outlet temperature, they determine the critical value of the target no-load cooling rate in the corresponding time period according to the temperature control duration. Then, based on the difference between the initial temperature and k * t s , they control the real-time outlet temperature T mCool down at a rate not higher than the critical value of the target no-load cooling rate, so that the real-time outlet temperature always cools down steadily with the critical value of the no-load cooling rate as the boundary, avoiding the actual cooling speed of the freeze-thaw machine exceeding the no-load cooling rate, which is beneficial to improving the reliability of the freeze-thaw process and at the same time enhancing the activity of the stock solution.

[0060] Optionally, the freeze-thaw machine controls the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature, and the critical value of the no-load cooling rate, including:

[0061] The heater performs proportional-integral-derivative control on the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature, and the critical value of the no-load cooling rate.

[0062] In this way, in the embodiments of the present disclosure, the heater performs proportional-integral-derivative control on the real-time outlet temperature according to the corresponding relationship between the initial temperature and the target temperature, and the critical value of the no-load cooling rate. Specifically, the target temperature can be divided into several temperature intervals and the real-time target temperature at each moment can be calculated, so that the real-time outlet temperature continuously chases the target temperature and finally reaches dynamic equilibrium.

[0063] In a practical application, as shown in Figure 1 , in the time period of [0, 65] min, the minimum value of the absolute value of the no-load cooling rate is 1 °C / min. The embodiments of the present disclosure add a set slope k0, and k0 is greater than zero and less than or equal to 1 °C.

[0064] The heater samples time based on the proportional-integral-derivative principle, and the sampling period △t is 1 s.

[0065] The set slope needs to be processed as follows: changing from °C / min to °C / s, that is

[0066] The real-time outlet temperature T m needs to be processed by differentiation as follows: sampling time based on the differentiation principle to obtain the outlet temperature at each sampling moment, and determining the outlet temperature at each sampling moment as the real-time outlet temperature T m . Among them, the sampling period △t is 1 s.

[0067] Given the initial temperature T0, the slope value k, and the current step running time t s , therefore, the real-time outlet temperature is:

[0068] T m = T0 - k * t s .

[0069] The heater determines the outlet temperature at each sampling moment as the real-time outlet temperature T m , and through the proportional-integral-derivative algorithm, makes the real-time outlet temperature Tm Follow the target temperature T1 in a chasing form and finally reach the target temperature T1. Considering the time delay of the freeze-thaw machine system, the real-time outlet temperature T m After reaching the target temperature T1, the real-time outlet temperature T m needs to be maintained near the target temperature T1 to form a dynamic balance.

[0070] Given the initial temperature T0, the slope value k, and the target temperature T1, the estimated cooling time of the freeze-thaw machine can be obtained:

[0071]

[0072] Combined with Figure 6 As shown, the embodiments of the present disclosure also provide a temperature control method for a freeze-thaw machine, including:

[0073] S41, the freeze-thaw machine obtains the critical value of the no-load cooling rate in the no-load state of the freeze-thaw machine during the test phase.

[0074] S42, during the operation phase of the freeze-thaw machine, the freeze-thaw machine obtains the initial temperature and the target temperature of the freeze-thaw machine.

[0075] S43, the freeze-thaw machine controls the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate, so that the real-time outlet temperature reaches the target temperature.

[0076] S44, the freeze-thaw machine obtains the output duty ratio of the heater.

[0077] S45, the freeze-thaw machine adjusts the opening degree of the electronic expansion valve of the refrigeration system according to the output duty ratio of the heater so that the real-time outlet temperature is within the temperature threshold range.

[0078] When using the temperature control method for a freeze-thaw machine provided by the embodiments of the present disclosure, if the freeze-thaw machine continuously cools at the no-load cooling rate, it is necessary to provide high power to the temperature control unit to suppress the cold capacity of the refrigeration system, which will increase the energy consumption of the freeze-thaw machine. To balance the cooling smoothness and energy consumption of the freeze-thaw machine, the embodiments of the present disclosure also obtain the output duty ratio of the heater and adjust the opening degree of the compressor electronic expansion valve according to the output duty ratio, so that the real-time outlet temperature is maintained within the temperature threshold range.

[0079] Optionally, the freeze-thaw machine adjusts the opening degree of the electronic expansion valve of the refrigeration system according to the output duty ratio of the heater, including:

[0080] When the output duty ratio is greater than the upper threshold of the duty ratio, the freeze-thaw machine reduces the opening degree of the electronic expansion valve to reduce the refrigeration capacity.

[0081] When the output duty ratio is less than or equal to the lower threshold of the duty ratio, the freeze-thaw machine increases the opening degree of the electronic expansion valve to increase the refrigeration capacity.

[0082] In this way, when the output duty cycle is greater than the upper limit threshold of the duty cycle, it indicates that the cooling capacity generated by the refrigeration system is too high. At this time, the opening degree of the electronic expansion valve can be appropriately reduced. When the output duty cycle is less than or equal to the lower limit threshold of the duty cycle, it indicates that the cooling capacity generated by the refrigeration system is too low. At this time, the opening degree of the electronic expansion valve can be appropriately increased. In this way, the output of the temperature control unit during the cooling process of the freeze-thaw machine is maintained within a reasonable temperature threshold range, taking into account both the cooling smoothness and energy consumption of the freeze-thaw machine.

[0083] Optionally, the freeze-thaw machine reduces the opening degree of the electronic expansion valve to reduce the cooling capacity, including: the freeze-thaw machine reduces the opening degree of the electronic expansion valve according to the first cycle threshold and the first opening step.

[0084] The freeze-thaw machine increases the opening degree of the electronic expansion valve to increase the cooling capacity, including: the freeze-thaw machine increases the opening degree of the electronic expansion valve according to the second cycle threshold and the second opening step.

[0085] Among them, the first cycle threshold and the second cycle threshold can be determined according to the actual application scenario of the freeze-thaw machine, and the first opening step and the second opening step can also be determined according to the actual application scenario of the freeze-thaw machine.

[0086] In another actual application, the upper limit threshold of the duty cycle is 50%, and the lower limit threshold of the duty cycle is 10%. The freeze-thaw machine adjusts the opening degree of the electronic expansion valve of the refrigeration system according to the output duty cycle of the heater, including:

[0087] When the output duty cycle is greater than 50%, the freeze-thaw machine reduces the opening degree of the electronic expansion valve by m steps every N minutes until the real-time outlet temperature is within the temperature threshold range.

[0088] When the output duty cycle is less than or equal to 10%, the freeze-thaw machine increases the opening degree of the electronic expansion valve by n steps every N minutes until the real-time outlet temperature is within the temperature threshold range.

[0089] Combined Figure 7 As shown, an embodiment of the present disclosure provides a temperature control device 200 for a freeze-thaw machine, including a first acquisition module 21, a second acquisition module 22, and a temperature control module 23. The first acquisition module 21 is configured to obtain the critical value of the no-load cooling rate in the no-load state of the freeze-thaw machine during the test phase; the second acquisition module 22 is configured to obtain the initial temperature and the target temperature of the freeze-thaw machine during the operation phase of the freeze-thaw machine; the temperature control module 23 is configured to control the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate, so that the real-time outlet temperature reaches the target temperature.

[0090] By using the temperature control device 200 for a freeze-thaw machine provided in the embodiments of the present disclosure, the real-time outlet temperature in the embodiments of the present disclosure can always be smoothly cooled with the critical value of the no-load cooling rate as the boundary, avoiding the actual cooling speed of the freeze-thaw machine exceeding the no-load cooling rate, which is beneficial to improving the reliability of the freeze-thaw process and at the same time improving the activity of the stock solution.

[0091] Combined with Figure 8 As shown, the embodiments of the present disclosure also provide a temperature control device 70 for a freeze-thaw machine, including a processor 700 and a memory 701. Optionally, the device 70 may further include a communication interface 702 and a bus 703. Among them, the processor 700, the communication interface 702, and the memory 701 can communicate with each other through the bus 703. The communication interface 702 can be used for information transmission. The processor 700 can call the logical instructions in the memory 701 to execute the temperature control method for the freeze-thaw machine in the above embodiments.

[0092] In addition, when the logical instructions in the above memory 701 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0093] The memory 701, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 700 executes functional applications and data processing by running the program instructions / modules stored in the memory 701, that is, implements the temperature control method for the freeze-thaw machine in the above embodiments.

[0094] The memory 701 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 701 may include a high-speed random access memory and may also include a non-volatile memory.

[0095] The embodiments of the present disclosure provide a freeze-thaw machine, including: a freeze-thaw machine body, and the above temperature control device 70(200) for a freeze-thaw machine. The freeze-thaw machine body includes a temperature control unit. The temperature control device 70(200) for a freeze-thaw machine is installed on the freeze-thaw machine body. The installation relationship described here is not limited to being placed inside the freeze-thaw machine body, but also includes installation connections with other components of the freeze-thaw machine, including but not limited to physical connections, electrical connections, or signal transmission connections, etc. Those skilled in the art can understand that the temperature control device 70(200) for a freeze-thaw machine can be adapted to a feasible freeze-thaw machine main body, and thus other feasible embodiments can be realized.

[0096] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions configured to execute the above-mentioned temperature control method for a freeze-thaw machine.

[0097] The technical solution of the embodiment of the present disclosure may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, such as: a USB flash drive, a portable hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc, and other media that can store program codes.

[0098] The above description and the drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments only represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or substituted for parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms as well. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations including one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups thereof. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or device including the element. In this document, what each embodiment focuses on may be the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, the relevant parts may refer to the description of the method part.

[0099] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0100] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. In addition, the functional units in the embodiments of the present disclosure can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0101] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a segment of code, or a portion thereof that contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks may occur in a different order than noted in the accompanying drawings. For example, two consecutive blocks may in fact be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. In the description corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may in fact be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A temperature control method for a freeze-thaw machine, characterized in that, Including: Obtaining the critical value of the no-load cooling rate of the freeze-thaw machine in the no-load state during the test phase; During the operation phase of the freeze-thaw machine, obtaining the initial temperature and the target temperature of the freeze-thaw machine; Controlling the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate, so that the real-time outlet temperature reaches the target temperature.

2. The method according to claim 1, characterized in that, Obtaining the critical value of the no-load cooling rate of the freeze-thaw machine in the no-load state during the test phase includes: During the test phase, obtaining the corresponding relationship between the outlet temperature of the temperature control unit of the freeze-thaw machine in the no-load state and time; According to the corresponding relationship between the outlet temperature of the temperature control unit of the freeze-thaw machine in the no-load state and time, obtaining the minimum value of the absolute value of the no-load cooling rate in different time periods; Determining that the minimum value of the absolute value of the no-load cooling rate in different time periods is the critical value of the no-load cooling rate for the corresponding time period.

3. The method according to claim 2, wherein Obtaining the no-load cooling rate in different time periods in the following manner: According to the corresponding relationship between the outlet temperature of the temperature control unit of the freeze-thaw machine in the no-load state and time, obtaining the no-load cooling curve of the freeze-thaw machine; According to the no-load cooling curve, obtaining the no-load cooling slope in different time periods; Determining that the no-load cooling slope in each time period is the no-load cooling rate for the corresponding time period.

4. The method according to claim 1, characterized in that Controlling the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate includes: Obtain the temperature control duration t corresponding to the real-time outlet temperature s ; According to the temperature control duration t s , determine the target no-load cooling rate critical value for the time period corresponding to the temperature control duration t s ; Based on the difference between the initial temperature T0 and k*t s control the real-time outlet temperature T m to cool down at a rate not higher than the critical value of the target no-load cooling rate.

5. The method according to any one of claims 1 to 4, characterized in that, Also including: Obtaining the output duty ratio of the heater; According to the output duty ratio of the heater, adjusting the opening degree of the electronic expansion valve of the refrigeration system so that the real-time outlet temperature is within the temperature threshold range.

6. The method according to claim 5, wherein Adjusting the opening degree of the electronic expansion valve of the refrigeration system according to the output duty ratio of the heater includes: In the case where the output duty ratio is greater than the upper threshold of the duty ratio, reducing the opening degree of the electronic expansion valve to reduce the refrigeration capacity; In the case where the output duty ratio is less than or equal to the lower threshold of the duty ratio, increasing the opening degree of the electronic expansion valve to increase the refrigeration capacity.

7. The method according to any one of claims 1 to 4, characterized in that Controlling the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate includes: Performing proportional-integral-derivative control on the real-time outlet temperature of the temperature control unit according to the corresponding relationship between the initial temperature and the target temperature and the critical value of the no-load cooling rate.

8. A temperature control device for a freeze-thaw machine, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the temperature control method for the freeze-thaw machine according to any one of claims 1 to 7 when running the program instructions.

9. A freeze-thaw machine, characterized in that, Including: A freeze-thaw machine body including a temperature control unit; The temperature control device for the freeze-thaw machine according to claim 8 is installed on the freeze-thaw machine body.

10. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are running, they are used to cause the computer to execute the temperature control method for the freeze-thaw machine according to any one of claims 1 to 7.

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