CN118242828A - Method and device for controlling freeze thawing machine and freeze thawing machine - Google Patents

Abstract

The application relates to the technical field of biological freezing, and discloses a method for controlling a freezing and thawing machine, which comprises the following steps: detecting the duty ratio of the electric heater when the temperature of the freeze thawing machine is controlled; and when the duty ratio of the electric heater is out of the set range, adjusting the operating frequency of the compressor of the two-stage cascade refrigeration system until the duty ratio of the electric heater is in the set range. In the temperature control process of the freeze thawing machine, the operating frequency of the compressor is regulated, so that the power of the electric heater is in a reasonable range, and the energy consumption for controlling the temperature of the freeze thawing machine is reduced while the temperature of the freeze thawing machine is controlled. The application also discloses a device for controlling the freeze thawing machine and the freeze thawing machine.

Description

Method and device for controlling freeze thawing machine and freeze thawing machine

Technical Field

The application relates to the technical field of biological refrigeration, in particular to a method and a device for controlling a freeze thawing machine and the freeze thawing machine.

Background

At present, a refrigerating process of an ultralow-temperature freezing and thawing machine generally uses a double-stage cascade refrigerating system, the system is divided into a high-temperature stage part and a low-temperature stage part, the refrigerant of the high-temperature stage part is evaporated to enable the refrigerant of the low-temperature stage part to be condensed, the refrigerant of the condensed low-temperature stage part enters an electronic expansion valve for throttling and depressurization, the refrigerant is evaporated in the low-temperature stage refrigerating plate for cooling a refrigerating medium, and the refrigerating medium flows through a freezing and thawing chamber for cooling the freezing and thawing chamber. However, the reaction time of the bipolar cascade refrigeration system on the temperature control of the freeze thawing chamber is long, and a long time is required for the variable frequency compressor to change the frequency so as to reduce or raise the temperature of the freeze thawing chamber, thereby causing inaccurate temperature control of the freeze thawing machine.

The related art discloses an operation control method, comprising: under a first setting mode, a first compressor of a first temperature level circulation system in the multi-split system is controlled to be closed, a second compressor of a second temperature level circulation system in the multi-split system is controlled to be opened, and an auxiliary electric heating system in the multi-split system is controlled to be closed; determining whether a temperature difference between the acquired target temperature and the indoor environment temperature is greater than or equal to a first set temperature in a first set mode; if the temperature difference between the target temperature and the indoor environment temperature is greater than or equal to the first set temperature in the first set mode, continuously acquiring the indoor environment temperature of the multi-split system; and if the temperature difference between the target temperature and the indoor environment temperature is smaller than the first set temperature in the first set mode, controlling the operation frequency of the second compressor to be reduced to the first set frequency, controlling the second compressor to operate according to the first operation frequency until the temperature difference between the target temperature and the indoor environment temperature is equal to the negative value of the first set temperature, and controlling the second compressor to operate according to the set first lowest frequency.

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

On the basis of a multi-stage refrigerating system, the temperature control is assisted by arranging the electric heater by adopting the related technology, so that the temperature control accuracy is improved to a certain extent. However, in the practical application process, the frequency of the compressor is generally larger when the temperature of the freeze thawing machine is controlled, so that the electric heater also needs to operate with higher power to realize the temperature control, which results in larger energy consumption.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a method and a device for controlling a freeze thawing machine and the freeze thawing machine, so that when the temperature of the freeze thawing machine is controlled, the power of an electric heater is in a reasonable range, and the energy consumption of the temperature control of the freeze thawing machine is reduced.

In some embodiments, the freeze-thaw machine includes a dual stage cascade refrigeration system and an electric heater; the method comprises the following steps: detecting the duty ratio of the electric heater when the temperature of the freeze thawing machine is controlled; and when the duty ratio of the electric heater is out of the set range, adjusting the operating frequency of the compressor of the two-stage cascade refrigeration system until the duty ratio of the electric heater is in the set range.

Optionally, adjusting the operating frequency of the compressor of the dual-stage cascade refrigeration system includes: determining a target compressor according to the running state of the two-stage cascade refrigeration system; the operating frequency of the target compressor is adjusted.

Optionally, determining the target compressor according to the operation state of the two-stage cascade refrigeration system includes: when the high-temperature-stage refrigeration cycle loop is independently operated, determining the high-temperature-stage compressor as a target compressor; when both the high-temperature-stage refrigeration cycle loop and the low-temperature-stage refrigeration cycle loop are operated, the low-temperature-stage compressor is determined to be the target compressor.

Optionally, before detecting the duty cycle of the electric heater, the method further includes: determining an initial operating frequency corresponding to a temperature interval according to the temperature interval in which the set temperature is located; the operating frequency of the compressor of the two-stage cascade refrigeration system is adjusted to an initial operating frequency.

Optionally, determining the initial operating frequency corresponding to the temperature interval according to the temperature interval in which the set temperature is located includes: acquiring a minimum temperature value of a temperature interval in which the set temperature is located; and determining the initial operating frequency corresponding to the minimum temperature value according to the preset corresponding relation.

Optionally, adjusting the operating frequency of the compressor of the dual-stage cascade refrigeration system to an initial operating frequency includes: when the high-temperature-stage refrigeration cycle loop is independently operated, the operating frequency of the high-temperature-stage compressor is adjusted to the initial operating frequency; when both the high temperature stage refrigeration cycle loop and the low temperature stage refrigeration cycle loop are operated, the operating frequency of the low temperature stage compressor is adjusted to the initial operating frequency.

Optionally, when the freeze thawing machine controls the temperature, the method further comprises: detecting the running state of the two-stage cascade refrigeration system; when the high-temperature-stage refrigeration cycle loop and the low-temperature-stage refrigeration cycle loop are both operated, the operation frequency of the high-temperature-stage compressor is adjusted to an upper limit value.

Optionally, when the high temperature stage refrigeration cycle loop and the low temperature stage refrigeration cycle loop are both operated, the method further comprises: when the duty ratio of the electric heater is greater than the duty ratio threshold, the operating frequency of the high temperature stage compressor is reduced.

Optionally, when the high temperature stage refrigeration cycle loop and the low temperature stage refrigeration cycle loop are both operated, the method further comprises: and adjusting the opening of the electronic expansion valve until the superheat degree of the electronic expansion valve is within the set superheat degree range.

Optionally, before the temperature control of the freeze thawing machine, the method further comprises: when the temperature of the freezing and thawing machine is raised, detecting the temperature of the freezing and thawing chamber; when the temperature of the freeze thawing chamber reaches the set temperature for the first time, calculating a first time length when the temperature of the freeze thawing chamber reaches the set temperature for the first time; when the first time reaches the time threshold, the electric heater is turned on.

In some embodiments, the apparatus comprises: a processor and a memory storing program instructions, said processor being configured to perform the above-described method for controlling a freeze-thaw machine when executing said program instructions.

In some embodiments, the freeze-thaw machine includes:

the freezing and thawing machine body comprises a two-stage cascade refrigerating system and an electric heater; and

The device for controlling the freeze thawing machine is arranged on the freeze thawing machine body.

In some embodiments, the computer readable storage medium stores program instructions that, when executed, perform the method for controlling a freeze-thaw machine described above.

The method and the device for controlling the freeze thawing machine and the freeze thawing machine provided by the embodiment of the disclosure can realize the following technical effects:

And when the temperature of the freeze thawing machine is controlled, detecting the duty ratio of the electric heater. And when the duty ratio of the electric heater is out of the set range, adjusting the operating frequency of the compressor of the two-stage cascade refrigeration system until the duty ratio of the electric heater is in the set range. In the temperature control process of the freeze thawing machine, the operating frequency of the compressor is regulated, so that the power of the electric heater is in a reasonable range, and the energy consumption for controlling the temperature of the freeze thawing machine is reduced while the temperature of the freeze thawing machine is controlled.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

FIG. 1 is a schematic diagram of a connection structure of a freeze thawing machine provided in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a method for controlling a freeze thawing machine provided in an embodiment of the present disclosure;

FIG. 3 is a schematic illustration of another method for controlling a freeze-thaw machine provided by embodiments of the present disclosure;

FIG. 4 is a schematic illustration of another method for controlling a freeze thawing machine provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of an apparatus for controlling a freeze thawing machine provided in an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a freeze-thaw machine provided by embodiments of the present disclosure.

Reference numerals:

1: a high temperature stage compressor; 2: water cooling plate replacement; 3: a thermal expansion valve; 4: a first electromagnetic valve; 5: a second electromagnetic valve; 6: exchanging a high-temperature-level refrigerating plate; 7: exchanging the composite plates; 8: a first gas-liquid separator; 9: a low temperature stage compressor; 10: an oil separator; 11: a first dry filter; 12: an electronic expansion valve; 13: low-temperature-level refrigerating plate replacement; 14: a second gas-liquid separator; 15: a circulation pump; 16: a freeze thawing chamber; 800: the device is used for controlling the water chiller; 801: a processor; 802: a memory; 803: a communication interface; 804: a bus; 900: and (5) a freeze thawing machine.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.

As shown in connection with fig. 1, embodiments of the present disclosure provide a freeze-thaw machine including a freeze-thaw chamber 16 and a dual-stage cascade refrigeration system configured to refrigerate the freeze-thaw chamber 16. The double-stage cascade refrigeration system comprises: a high temperature stage refrigeration cycle, a low temperature stage refrigeration cycle, and a coolant cycle. The low-temperature-stage refrigeration cycle loop and the high-temperature-stage refrigeration cycle loop are connected through a composite plate exchanger 7 and exchange heat. The secondary refrigerant circulation loop is connected with the high-temperature-level refrigeration circulation loop through the high-temperature-level refrigeration plate exchanger 6 and exchanges heat, and the secondary refrigerant circulation loop is connected with the low-temperature-level refrigeration circulation loop through the low-temperature-level refrigeration plate exchanger 13 and exchanges heat. The refrigerant in the high-temperature-stage refrigeration cycle flows through the composite plate exchanger 7 after exchanging heat with the secondary refrigerant cycle in the high-temperature-stage refrigeration plate exchanger 6.

By adopting the two-stage cascade refrigeration system provided by the embodiment of the disclosure, the two-stage cascade refrigeration system is additionally provided with the high-temperature-stage refrigeration plate exchanger 6, and the refrigerant of the high-temperature-stage refrigeration cycle is controlled to flow through the cascade plate exchanger 7 after exchanging heat between the high-temperature-stage refrigeration plate exchanger 6 and the refrigerating medium of the refrigerating medium cycle. Through setting up high temperature level refrigeration board and trade 6, can make high temperature level refrigeration cycle return circuit alone to the refrigerating medium circulation return circuit refrigeration, need not to offset the heat that low temperature level compressor 9 absorbed from the refrigerating medium circulation and low temperature level compressor 9 to the acting of refrigerant, reduced the type selection of high temperature level compressor 1, reduced the cost. Because the refrigerant of the high-temperature-level refrigeration cycle flows through the composite plate exchanger 7 after the heat exchange between the high-temperature-level refrigeration plate exchanger 6 and the secondary refrigerant cycle, the temperature and the pressure of the low-temperature-level refrigeration cycle are reduced, and the low-temperature-level refrigeration cycle can be started at any time when the secondary refrigerant has ultralow temperature requirements. The type selection of the high-temperature-stage compressor 1 is reduced, and meanwhile, the response speed of the low-temperature-stage part of the double-stage cascade refrigeration system is improved, so that the ultralow temperature requirement of the secondary refrigerant can be timely met.

Optionally, the high temperature stage refrigeration cycle comprises: a heat exchange main loop and a heat exchange branch. The heat exchange main loop comprises a thermal expansion valve 3 and a first electromagnetic valve 4 arranged between the thermal expansion valve 3 and a composite plate exchanger 7. The heat exchange branch comprises a second electromagnetic valve 5 configured to control the on-off of the heat exchange branch, and the second electromagnetic valve 5 is connected with a high-temperature-stage refrigeration plate exchanger 6. The inlet pipeline of the heat exchange branch is arranged between the thermal expansion valve 3 and the first electromagnetic valve 4, and the outlet pipeline is arranged between the first electromagnetic valve 4 and the composite plate exchanger 7.

In this way, the first electromagnetic valve 4 can control the on-off of the heat exchange main loop, and the second electromagnetic valve 5 can control the on-off of the heat exchange branch. When the first electromagnetic valve 4 is opened and the second electromagnetic valve 5 is closed, the refrigerant can be throttled and depressurized through the thermal expansion valve 3 of the heat exchange main circuit, and favorable conditions can be created for evaporation of the refrigerant in the complex plate exchange 7, so that the refrigerant is evaporated in the complex plate exchange 7, the refrigerant of the low-temperature-level refrigeration cycle circuit is condensed in the complex plate exchange 7, and heat exchange of the high-temperature-level refrigeration cycle circuit and the low-temperature-level refrigeration cycle circuit is completed. When the first electromagnetic valve 4 is closed and the second electromagnetic valve 5 is opened, the refrigerant flows from the inlet of the heat exchange branch to the heat exchange branch, flows through the high-temperature-stage refrigeration plate exchanger 6 to exchange heat with the refrigerating medium circulation loop, flows through the high-temperature-stage refrigeration plate exchanger 6 to return to the heat exchange main loop through the outlet of the heat exchange branch, flows through the composite plate exchanger 7, reduces the temperature and pressure of the refrigerant in the low-temperature-stage refrigeration circulation loop, ensures that the low-temperature-stage refrigeration circulation loop can be started at any time when the refrigerating medium has ultralow temperature requirement, and improves the response speed of the low-temperature-stage part of the double-stage cascade refrigeration system.

Optionally, the heat exchange main circuit further comprises: a high temperature stage compressor 1. The inlet pipeline of the high-temperature-stage compressor 1 is connected with the composite plate exchanger 7 through the first gas-liquid separator 8, and the outlet pipeline of the high-temperature-stage compressor 1 is connected with the thermal expansion valve 3 through the water-cooling plate exchanger 2.

In this way, by providing the first gas-liquid separator 8 in front of the inlet line of the high-temperature-stage compressor 1, it is possible to separate and remove droplets, such as refrigerant or lubricating oil that is not completely evaporated, possibly entrained in the refrigerant flowing out of the composite plate exchanger 7, from entering the high-temperature-stage compressor 1 and causing liquid hammer, thus ensuring safe operation of the high-temperature-stage compressor 1. By arranging the water-cooling plate exchanger 2 behind the outlet pipeline of the high-temperature-stage compressor 1, the temperature of the refrigerant flowing out of the high-temperature-stage compressor 1 can be effectively reduced, and favorable conditions are created for evaporation of the refrigerant in the composite plate exchanger 7.

Optionally, the low-temperature-stage refrigeration cycle includes: the low-temperature-stage compressor 9, an inlet pipeline is connected with the low-temperature-stage refrigeration plate exchanger 13 through a second gas-liquid separator 14, and an outlet pipeline is connected with the compound plate exchanger 7 through an oil separator 10; a first dry filter 11 and an electronic expansion valve 12 are sequentially arranged on a pipeline between the composite plate exchanger 7 and the low-temperature-stage refrigeration plate exchanger 13.

The oil separator 10 is also connected with an oil return port of the low-temperature-stage compressor 9.

In this way, by providing the second gas-liquid separator 14 before the inlet line of the low-temperature stage compressor 9, it is possible to separate and remove liquid droplets, such as refrigerant or lubricating oil which is not completely evaporated, possibly entrained in the refrigerant flowing out of the low-temperature stage refrigeration plate exchanger 13, from entering the low-temperature stage compressor 9 and causing liquid hammer, thereby ensuring safe operation of the low-temperature stage compressor 9. By providing the oil separator 10 behind the outlet pipe of the low-temperature-stage compressor 9, it is possible to separate out the lubricating oil in the refrigerant discharged from the low-temperature-stage compressor 9 and send the lubricating oil to the low-temperature-stage compressor 9 again, ensuring lubrication and cooling effects inside the low-temperature-stage compressor 9. The lubricating oil can be prevented from excessively accumulating in the system, the service efficiency of the lubricating oil can be improved, and the service life of the compressor can be prolonged.

Optionally, the coolant circulation loop comprises: and a circulation pump 15. The outlet pipeline of the circulating pump 15 is connected with one end of the high-temperature-level refrigerating plate exchanger 6 through the low-temperature-level refrigerating plate exchanger 13, and the inlet pipeline of the circulating pump 15 is connected with the other end of the high-temperature-level refrigerating plate exchanger 6 through the freeze thawing chamber 16.

In this way, the refrigerating medium circulation loop controls the refrigerating medium to circulate through the circulation pump 15, exchanges heat with the low-temperature-level refrigeration circulation loop through the low-temperature-level refrigeration plate exchanger 13, or exchanges heat with the high-temperature-level refrigeration circulation loop through the high-temperature-level refrigeration plate exchanger 6, and the refrigerating medium after heat exchange flows through the freezing and thawing chamber 16 to finish the refrigeration of the freezing and thawing chamber 16.

Optionally, the freeze thawing machine further comprises a processor, and the processor is electrically connected with the electric components and used for controlling the electric components to act.

Fig. 2 to fig. 4 are schematic diagrams of a method for controlling a freeze/thaw machine according to an embodiment of the present disclosure, where any of the following methods may be performed in the freeze/thaw machine, or may be performed in a server or a terminal device in communication with the freeze/thaw machine. In the embodiment of the disclosure, a description is given of a solution using a freeze thawing machine as an execution body.

Based on the above-described structure of the freeze-thawing machine, as shown in fig. 2, an embodiment of the present disclosure provides a method for controlling a freeze-thawing machine, including:

S21, when the temperature of the freeze thawing machine is controlled, the freeze thawing machine detects the duty ratio of the electric heater.

And S22, when the duty ratio of the electric heater is out of the set range, the freezing and thawing machine adjusts the operation frequency of the compressor of the two-stage cascade refrigeration system until the duty ratio of the electric heater is in the set range.

When the duty ratio of the electric heater is larger than the maximum value of the set range, the freezing and thawing machine reduces the running frequency of the compressor of the two-stage cascade refrigeration system; when the duty ratio of the electric heater is smaller than the minimum value of the set range, the freezing and thawing machine improves the operation frequency of the compressor of the two-stage cascade refrigeration system. For example, every second period of time, detecting the duty cycle of the electric heater, and controlling the compressor to remain the same when the duty cycle of the electric heater is within 10% to 50%; when the duty ratio of the electric heater is more than 50%, the cold quantity is more, the operating frequency of the compressor is reduced by the freezing and thawing machine, and the preset frequency can be reduced every third time period; when the duty ratio of the electric heater is smaller than 10%, the cold quantity is lower, the operating frequency of the compressor is improved by the freezing and thawing machine, and the preset frequency can be improved every third time.

By adopting the method for controlling the freeze-thawing machine provided by the embodiment of the disclosure, when the temperature of the freeze-thawing machine is controlled, the freeze-thawing machine detects the duty ratio of the electric heater. When the duty ratio of the electric heater is out of the set range, the freezing and thawing machine adjusts the operation frequency of the compressor of the two-stage cascade refrigeration system until the duty ratio of the electric heater is in the set range. In the temperature control process of the freeze thawing machine, the running frequency of the compressor is regulated, so that the power of the electric heater is in a reasonable range, the excessive energy consumption of the electric heater is avoided, and the temperature control energy consumption of the freeze thawing machine is reduced while the temperature of the freeze thawing machine is controlled.

Optionally, the freeze thawing machine adjusts an operating frequency of a compressor of the dual-stage cascade refrigeration system, comprising: the freezing and thawing machine determines a target compressor according to the running state of the two-stage cascade refrigeration system; the freeze thawing machine adjusts the operating frequency of the target compressor.

In this way, the freeze thawing machine determines the target compressor according to the operating state of the two-stage cascade refrigeration system and adjusts the operating frequency of the target compressor. The target compressor is determined based on the running state of the two-stage cascade refrigeration system, and the compressor with the running frequency adjusted can be matched with the current running state of the freezing and thawing machine, so that the accuracy of electric heater duty ratio adjustment is improved.

Optionally, the freeze thawing machine determines the target compressor according to the operation state of the two-stage cascade refrigeration system, including: when the high-temperature-level refrigeration cycle loop is independently operated, the freeze thawing machine determines that the high-temperature-level compressor is a target compressor; when both the high-temperature-stage refrigeration cycle loop and the low-temperature-stage refrigeration cycle loop are operated, the freeze thawing machine determines the low-temperature-stage compressor as the target compressor.

Thus, when the high temperature stage refrigeration cycle is operating alone, only the high temperature stage refrigeration cycle is now refrigerating the coolant circulation circuit, i.e., only the high temperature stage compressor is activated, and therefore the freeze thawing machine determines the high temperature stage compressor as the target compressor. When both the high-temperature-stage refrigeration cycle and the low-temperature-stage refrigeration cycle are operated, both the high-temperature-stage compressor and the low-temperature-stage compressor are started at this time, but only the low-temperature-stage refrigeration cycle cools the coolant circulation circuit, thereby refrigerating the freeze thawing chamber, and therefore the freeze thawing machine determines the low-temperature-stage compressor of the low-temperature-stage refrigeration cycle as the target compressor.

Based on the above-described structure of the freeze-thawing machine, as shown in fig. 3, an embodiment of the present disclosure provides a method for controlling a freeze-thawing machine, including:

And S31, when the temperature of the freeze thawing machine is controlled, the freeze thawing machine determines the initial running frequency corresponding to the temperature interval according to the temperature interval where the set temperature is located.

S32, the freeze thawing machine adjusts the operation frequency of the compressor of the two-stage cascade refrigeration system to the initial operation frequency.

S33, detecting the duty ratio of the electric heater by the freeze thawing machine.

And S22, when the duty ratio of the electric heater is out of the set range, the freezing and thawing machine adjusts the operation frequency of the compressor of the two-stage cascade refrigeration system until the duty ratio of the electric heater is in the set range.

By adopting the method for controlling the freeze-thawing machine, when the freeze-thawing machine controls the temperature, before the freeze-thawing machine detects the duty ratio of the electric heater, the freeze-thawing machine determines the initial operating frequency corresponding to the temperature interval according to the temperature interval in which the set temperature is located, and adjusts the operating frequency of the compressor of the two-stage cascade refrigeration system to the initial operating frequency. Before the duty ratio of the electric heater is controlled in the temperature control stage of the freeze thawing machine, the operating frequency of the compressor is adjusted to the initial operating frequency corresponding to the temperature interval where the set temperature is located, so that the operating frequency of the compressor can be matched with the current temperature condition, and the temperature control accuracy of the freeze thawing machine is improved.

Optionally, the determining, by the freeze thawing machine according to a temperature interval in which the set temperature is located, an initial operating frequency corresponding to the temperature interval includes: the freezing and thawing machine obtains the minimum temperature value of the temperature interval in which the set temperature is located; and determining the initial operating frequency corresponding to the minimum temperature value by the freeze thawing machine according to the preset corresponding relation.

The preset corresponding relation is the corresponding relation between the set temperature and the running frequency of the compressor. The set temperature is inversely related to the operating frequency of the compressor, the lower the set temperature, the higher the operating frequency of the compressor, and the higher the set temperature, the lower the operating frequency of the compressor. The preset correspondence may be obtained in any manner, for example, user setting, developer determination, or experimental measurement.

In the actual application process, when the set temperature is in a first temperature interval, a second temperature interval and a third temperature interval, only the high-temperature-level refrigeration cycle loop is started, so that when the set temperature is in the first temperature interval, the initial running frequency of the high-temperature-level compressor is determined to be 30Hz; when the set temperature is in the second temperature interval, determining that the initial operating frequency of the high-temperature-stage compressor is 50Hz; when the set temperature is in the third temperature interval, determining that the initial operating frequency of the high-temperature-stage compressor is 70Hz; wherein the first temperature interval is greater than the second temperature interval, which is greater than the third temperature interval; when the set temperature is in the fourth temperature interval, the freezing and thawing machine starts a high-temperature-level refrigerating circulation loop and a low-temperature-level refrigerating circulation loop, the operating frequency of the high-temperature-level compressor is 70Hz, and the initial operating frequency of the low-temperature-level compressor is determined to be 30Hz by the freezing and thawing machine; when the set temperature is in the fifth temperature interval, determining that the initial operating frequency of the low-temperature-stage compressor is 50Hz; when the set temperature is in the sixth temperature interval, determining that the initial operating frequency of the low-temperature-stage compressor is 70Hz; wherein the third temperature interval is greater than the fourth temperature interval, which is greater than the fifth temperature interval; the fifth temperature interval is greater than the sixth temperature interval.

In this way, the freezing and thawing machine obtains the minimum temperature value of the temperature interval in which the set temperature is located, and determines the initial operating frequency corresponding to the minimum temperature value according to the preset corresponding relation. By taking the operation frequency corresponding to the minimum temperature value of the temperature interval in which the set temperature is located as the initial operation frequency of the compressor, even if the initial operation frequency of the compressor is larger than the operation frequency of the compressor corresponding to the set temperature, the sufficient cold energy of the freezing and thawing machine can be ensured. Even if the operation frequency of the compressor is regulated subsequently, the operation frequency of the compressor is reduced to enable the duty ratio of the electric heater to be in a set range, the cooling capacity requirement of the freezing and thawing machine can be met, and the influence of the control of the duty ratio of the electric heater on the accurate temperature control of the freezing and thawing machine is reduced.

Optionally, the freeze thawing machine adjusts an operating frequency of a compressor of the dual-stage cascade refrigeration system to an initial operating frequency, comprising: when the high-temperature-stage refrigeration cycle loop is independently operated, the freezing and thawing machine adjusts the operating frequency of the high-temperature-stage compressor to the initial operating frequency; when the high-temperature-stage refrigeration cycle loop and the low-temperature-stage refrigeration cycle loop are both operated, the freeze thawing machine adjusts the operating frequency of the low-temperature-stage compressor to the initial operating frequency.

Thus, when the high-temperature-stage refrigeration cycle is operated alone, only the high-temperature-stage refrigeration cycle cools the coolant circulation circuit at this time, i.e., only the high-temperature-stage compressor is started, and therefore the freeze-thaw machine adjusts the operating frequency of the high-temperature-stage compressor to the initial operating frequency. When both the high-temperature-stage refrigeration cycle and the low-temperature-stage refrigeration cycle are operated, both the high-temperature-stage compressor and the low-temperature-stage compressor are started at this time, but only the low-temperature-stage refrigeration cycle cools the coolant circulation circuit, thereby refrigerating the freeze-thawing chamber, and therefore, the freeze-thawing machine adjusts the operating frequency of the low-temperature-stage compressor to the initial operating frequency.

Based on the above-described structure of the freeze-thawing machine, as shown in fig. 4, an embodiment of the present disclosure provides a method for controlling a freeze-thawing machine, including:

s41, detecting the running state of the two-stage cascade refrigeration system by the freeze thawing machine when the temperature of the freeze thawing machine is controlled.

S42, when the high-temperature-level refrigeration cycle loop and the low-temperature-level refrigeration cycle loop are both operated, the freeze thawing machine adjusts the operation frequency of the high-temperature-level compressor to an upper limit value.

S43, detecting the duty ratio of the electric heater by the freeze thawing machine.

And S22, when the duty ratio of the electric heater is out of the set range, the freezing and thawing machine adjusts the operation frequency of the compressor of the two-stage cascade refrigeration system until the duty ratio of the electric heater is in the set range.

By adopting the method for controlling the freezing and thawing machine provided by the embodiment of the disclosure, when the temperature of the freezing and thawing machine is controlled, the freezing and thawing machine detects the running state of the two-stage cascade refrigerating system. When the high-temperature-level refrigeration cycle loop and the low-temperature-level refrigeration cycle loop are operated, at the moment, the freezing and thawing machine has larger demand for cold energy, so that the freezing and thawing machine adjusts the operation frequency of the high-temperature-level compressor to the upper limit value, and improves the refrigerating capacity of the bipolar cascade refrigerating system so as to meet the demand of the freezing and thawing machine for cold energy by controlling the temperature.

Optionally, when the high temperature stage refrigeration cycle loop and the low temperature stage refrigeration cycle loop are both operated, the method further comprises: when the duty ratio of the electric heater is greater than the duty ratio threshold, the freeze thawing machine reduces the operating frequency of the high temperature stage compressor.

When the high-temperature-level refrigerating circulation loop and the low-temperature-level refrigerating circulation loop are both operated, the high-temperature-level compressor is fully opened to the upper limit value of 70Hz, and when the duty ratio of the electric heater is larger than the duty ratio threshold value, the cold quantity is more, so that the operating frequency of the high-temperature-level compressor can be reduced to 65Hz, 60Hz or other operating frequencies by the freezing and thawing machine, and the cold quantity is reduced.

Therefore, when the duty ratio of the electric heater is larger than the duty ratio threshold value, the cold quantity of the freezing and thawing machine is larger, and the freezing and thawing machine can reduce the running frequency of the high-temperature-stage compressor, so that the cold quantity is reduced, the temperature control accuracy requirement of the freezing and thawing machine is met, and the energy consumption is reduced.

Optionally, when the high temperature stage refrigeration cycle loop and the low temperature stage refrigeration cycle loop are both operated, the method further comprises: and the opening of the electronic expansion valve is regulated by the freeze thawing machine until the superheat degree of the electronic expansion valve is within the set superheat degree range.

Therefore, the opening degree of the electronic expansion valve is regulated by the freezing and thawing machine until the superheat degree of the electronic expansion valve is in the set superheat degree range, so that the refrigerant evaporation process in the low-temperature-level refrigeration plate replacement can be more uniform and sufficient, the refrigeration efficiency is improved, the temperature of the freezing and thawing chamber can reach the set temperature more quickly, and the energy consumption is reduced to a certain extent. In addition, the refrigerant evaporation process is more uniform and sufficient, so that the pressure change in the system tends to be relatively stable, and the vibration and noise caused by pressure fluctuation are reduced.

Optionally, before the temperature control of the freeze thawing machine, the method further comprises: when the freezing and thawing machine pulls the temperature, the freezing and thawing machine detects the temperature of the freezing and thawing chamber; when the temperature of the freeze thawing chamber reaches the set temperature for the first time, the freeze thawing machine calculates a first time length when the temperature of the freeze thawing chamber reaches the set temperature for the first time; when the first time reaches the time threshold, the freezing and thawing machine turns on the electric heater.

Thus, when the freeze-thawing machine pulls the temperature, the freeze-thawing machine detects the temperature of the freeze-thawing chamber. When the temperature of the freeze thawing chamber reaches the set temperature for the first time, the freeze thawing machine calculates a first time period when the temperature of the freeze thawing chamber reaches the set temperature for the first time. When the first time reaches the time threshold, the freezing and thawing machine turns on the electric heater. The first temperature of the freezing and thawing chamber reaches the set temperature, the electric heater is started after the first time is delayed, and the operation frequency of the compressor is adjusted, so that misjudgment caused by system overshoot can be avoided, and the operation frequency of the compressor is adjusted.

As shown in connection with fig. 5, an embodiment of the present disclosure provides an apparatus 800 for controlling a freeze-thaw machine, including a processor 801 and a memory 802. Optionally, the apparatus may also include a communication interface (Communication Interface) 803 and a bus 804. The processor 801, the communication interface 803, and the memory 802 may communicate with each other via the bus 804. The communication interface 803 may be used for information transfer. Processor 801 may invoke logic instructions in memory 802 to perform the method for controlling a freeze-thaw machine of the above embodiments.

Further, the logic instructions in the memory 802 described above may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product.

The memory 802 is a computer-readable storage medium that can be used to store a software program, a computer-executable program, and program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 801 executes functional applications and data processing by running program instructions/modules stored in the memory 802, i.e., implements the method for controlling the freeze thawing machine in the above-described embodiments.

Memory 802 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of the terminal device, etc. In addition, memory 802 may include high-speed random access memory, and may also include non-volatile memory.

As shown in connection with fig. 6, an embodiment of the present disclosure provides a freeze thawing machine 900 comprising: a freeze-thaw machine body, and an apparatus 800 for controlling a freeze-thaw machine as described above. The apparatus 800 for controlling the freeze-thaw machine is mounted to a freeze-thaw machine body. The mounting relationships described herein are not limited to placement within the freeze-thaw machine, but include mounting connections to 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 will appreciate that the apparatus 800 for controlling a freeze-thaw machine may be adapted to a viable freeze-thaw machine body to achieve other viable embodiments.

Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for controlling a freeze-thaw machine.

Embodiments of the present disclosure may be embodied in a software product stored on a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium including: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this disclosure is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in the present disclosure, the terms "comprises," "comprising," and/or variations thereof, mean that the recited features, integers, steps, operations, elements, and/or components are present, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus that includes the element. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.

Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The flowcharts and block diagrams in the figures 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 diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (10)

1. A method for controlling a freeze-thaw machine, wherein the freeze-thaw machine comprises a two-stage cascade refrigeration system and an electric heater; the method comprises the following steps:

detecting the duty ratio of the electric heater when the temperature of the freeze thawing machine is controlled;

And when the duty ratio of the electric heater is out of the set range, adjusting the operating frequency of the compressor of the two-stage cascade refrigeration system until the duty ratio of the electric heater is in the set range.

2. The method of claim 1, wherein adjusting an operating frequency of a compressor of a dual stage cascade refrigeration system comprises:

determining a target compressor according to the running state of the two-stage cascade refrigeration system;

The operating frequency of the target compressor is adjusted.

3. The method of claim 2, wherein determining the target compressor based on the operating conditions of the dual stage cascade refrigeration system comprises:

when the high-temperature-stage refrigeration cycle loop is independently operated, determining the high-temperature-stage compressor as a target compressor;

when both the high-temperature-stage refrigeration cycle loop and the low-temperature-stage refrigeration cycle loop are operated, the low-temperature-stage compressor is determined to be the target compressor.

4. A method according to any one of claims 1 to 3, further comprising, prior to detecting the duty cycle of the electric heater:

determining an initial operating frequency corresponding to a temperature interval according to the temperature interval in which the set temperature is located;

the operating frequency of the compressor of the two-stage cascade refrigeration system is adjusted to an initial operating frequency.

5. The method of claim 4, wherein determining the initial operating frequency corresponding to the temperature interval based on the temperature interval in which the set temperature is located comprises:

Acquiring a minimum temperature value of a temperature interval in which the set temperature is located;

And determining the initial operating frequency corresponding to the minimum temperature value according to the preset corresponding relation.

6. The method of claim 5, wherein adjusting the operating frequency of the compressor of the dual-stage cascade refrigeration system to the initial operating frequency comprises:

When the high-temperature-stage refrigeration cycle loop is independently operated, the operating frequency of the high-temperature-stage compressor is adjusted to the initial operating frequency;

When both the high temperature stage refrigeration cycle loop and the low temperature stage refrigeration cycle loop are operated, the operating frequency of the low temperature stage compressor is adjusted to the initial operating frequency.

7. A method according to any one of claims 1 to 3, further comprising, when the freeze-thaw machine is temperature controlled:

detecting the running state of the two-stage cascade refrigeration system;

when the high-temperature-stage refrigeration cycle loop and the low-temperature-stage refrigeration cycle loop are both operated, the operation frequency of the high-temperature-stage compressor is adjusted to an upper limit value.

8. A method according to any one of claims 1 to 3, further comprising, prior to the controlling of the temperature of the freeze-thaw machine:

When the temperature of the freezing and thawing machine is raised, detecting the temperature of the freezing and thawing chamber;

when the temperature of the freeze thawing chamber reaches the set temperature for the first time, calculating a first time length when the temperature of the freeze thawing chamber reaches the set temperature for the first time;

when the first time reaches the time threshold, the electric heater is turned on.

9. An apparatus for controlling a freeze-thaw machine comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for controlling a freeze-thaw machine according to any one of claims 1 to 8 when executing the program instructions.

10. A freeze thawing machine, comprising:

the freezing and thawing machine body comprises a two-stage cascade refrigerating system and an electric heater; and

The apparatus for controlling a freeze-thaw machine of claim 9 mounted to the freeze-thaw machine body.