CN113909006B - Method and device for controlling temperature of centrifugal machine and centrifugal machine - Google Patents
Method and device for controlling temperature of centrifugal machine and centrifugal machine Download PDFInfo
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- CN113909006B CN113909006B CN202111210161.XA CN202111210161A CN113909006B CN 113909006 B CN113909006 B CN 113909006B CN 202111210161 A CN202111210161 A CN 202111210161A CN 113909006 B CN113909006 B CN 113909006B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
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- B04B15/02—Other accessories for centrifuges for cooling, heating, or heat insulating
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Abstract
The application relates to the technical field of centrifuges, and discloses a method for controlling the temperature of a centrifuger, wherein the centrifuger comprises a refrigerating system consisting of a compressor, an evaporator, a condenser and a thermal expansion valve; the method comprises the following steps: determining a reference temperature t a; detecting the temperature in the cavity of the centrifugal machine to obtain a temperature detection value t b; calculating a difference delta t between the temperature detection value t b and the reference temperature t a; and under the condition that the absolute value of the difference delta t is larger than or equal to a preset threshold value, adjusting the rotating speed of the variable frequency compressor so as to enable the temperature in the cavity of the centrifugal machine to be close to the target temperature. The method can adjust the rotating speed of the variable frequency compressor based on the temperature in the cavity of the centrifugal machine, so that the temperature in the cavity of the centrifugal machine is more stable. The application also discloses a device for controlling the temperature of the centrifugal machine and the centrifugal machine.
Description
Technical Field
The application relates to the technical field of centrifuge control, in particular to a method and a device for controlling temperature of a centrifuge and the centrifuge.
Background
At present, with the development of medical science and biological laboratories, more stringent requirements are put on the temperature control of laboratory centrifuges. In the related art, a system for controlling temperature of a centrifuge using a variable frequency compressor is disclosed, comprising: variable frequency compressor, temperature sensor, centrifuge control board, etc.; when the centrifugal machine works, if the temperature in the cavity of the centrifugal machine is close to the set temperature, the frequency of the compressor is slowly adjusted by the control board of the centrifugal machine according to the temperature in the cavity of the centrifugal machine detected by the temperature sensor, so that the temperature in the cavity of the centrifugal machine is close to the set temperature.
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:
although the conventional method describes that the frequency of the compressor is slowly adjusted when the temperature approaches the set temperature, a more specific temperature control method is not provided.
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, a device and a centrifuge for controlling the temperature of the centrifuge, so as to provide a clear method for controlling the temperature of the centrifuge by adopting a variable frequency compressor.
In some embodiments, the method comprises: determining a reference temperature t a; detecting the temperature in the cavity of the centrifugal machine to obtain a temperature detection value t b; calculating a difference delta t between the temperature detection value t b and the reference temperature t a; and under the condition that the absolute value delta t of the difference between the temperature detection value t b and the reference temperature t a is larger than or equal to a preset threshold value, adjusting the rotating speed of the variable frequency compressor so as to enable the temperature in the cavity of the centrifugal machine to be close to the target temperature.
In some embodiments, the apparatus comprises: a processor and a memory storing program instructions, the processor being configured to perform the above-described method for centrifuge temperature control when the program instructions are run.
In some embodiments, the centrifuge comprises: the refrigerating system consists of a compressor, an evaporator, a condenser and a thermal expansion valve, and the device for controlling the temperature of the centrifugal machine.
The method, the device and the centrifuge for controlling the temperature of the centrifuge, which are provided by the embodiment of the disclosure, can realize the following technical effects:
The method for controlling the temperature of the centrifugal machine by adopting the variable frequency compressor can adjust the rotating speed of the variable frequency compressor based on the temperature in the cavity of the centrifugal machine, so that the temperature in the cavity of the centrifugal machine is more stable.
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 illustration of a method for centrifuge temperature control provided by an embodiment of the present disclosure;
FIG. 2 is a schematic illustration of another method for centrifuge temperature control provided by an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a method for adjusting the rotational speed of a variable frequency compressor provided by an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another method for adjusting the rotational speed of a variable frequency compressor provided by an embodiment of the present disclosure;
FIG. 5 is a schematic illustration of one application provided by an embodiment of the present disclosure;
fig. 6 is a schematic diagram of an apparatus for temperature control of a centrifuge provided in an embodiment of the present disclosure.
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.
In the embodiment of the disclosure, a refrigerating system of a centrifugal machine comprises a refrigerant loop formed by sequentially connecting a compressor, an evaporator, a condenser and a thermal expansion valve. Wherein, the compressor is a variable frequency compressor.
As shown in conjunction with fig. 1, an embodiment of the present disclosure provides a method for centrifuge temperature control, comprising:
S01, determining a reference temperature t a by the centrifugal machine processor.
In embodiments of the present disclosure, the determination of the reference temperature t a may be set according to the target temperature, or may be set according to the temperature within the centrifuge chamber.
S02, detecting the temperature in the cavity of the centrifugal machine by using a temperature detection element to obtain a temperature detection value t b.
A temperature sensing element, e.g., a temperature sensor, is disposed within the centrifuge chamber to sense the temperature within the centrifuge chamber and to transmit a sensed temperature signal to the centrifuge processor so that the centrifuge processor obtains a temperature sensed value t b.
S03, the centrifugal machine processor calculates a difference delta t between the temperature detection value t b and the reference temperature t a.
S04, under the condition that the absolute value of the difference value delta t is larger than or equal to a preset threshold value, the centrifugal machine processor adjusts the rotating speed of the variable frequency compressor so as to enable the temperature in the centrifugal machine cavity to be close to the target temperature.
In the embodiment of the disclosure, the preset threshold is a set value, for example, the preset threshold is 0.3 ℃. And when |t b-ta |=deltat is more than or equal to 0.3, namely t b-ta is more than or equal to 0.3 or t b-ta is less than or equal to-0.3, the rotating speed of the variable frequency compressor is regulated. As an example, if t b-ta is greater than or equal to 0.3, it indicates that the temperature in the cavity of the centrifuge rises faster, and the rotation speed of the variable frequency compressor needs to be increased to reduce the temperature in the cavity of the centrifuge. Here, the rotation speed of the variable frequency compressor is increased, and the rotation speed of the variable frequency compressor can be increased according to a certain adjustment speed. Or the rotational speed of the variable frequency compressor can be directly adjusted to a higher rotational speed. As another example, if t b-ta is less than or equal to-0.3, a faster temperature drop in the centrifuge chamber is indicated. It is necessary to reduce the rotational speed of the inverter compressor to increase the temperature in the chamber of the centrifuge. Likewise, the variable frequency compressor speed may be reduced at a certain adjustment speed, or the variable frequency compressor speed may be directly reduced to a lower speed.
It will be appreciated that in the event that the absolute value of the difference Δt between the temperature detection value t b and the reference temperature t a is less than a preset threshold, the centrifuge processor maintains the rotational speed of the inverter compressor. When the absolute value of the difference Δt is smaller than a preset threshold, i.e., -0.3 < t b-ta < 0.3, it is shown that the temperature change is within a reasonable range. At this time, the rotation speed of the inverter compressor does not need to be adjusted.
By adopting the method for controlling the temperature of the centrifugal machine, which is provided by the embodiment of the disclosure, the rotating speed of the variable frequency compressor can be adjusted based on the temperature in the cavity of the centrifugal machine, so that the temperature in the cavity of the centrifugal machine is more stable.
Optionally, in step S01, the reference temperature t a is determined by:
Judging whether the difference between the current temperature in the cavity of the centrifugal machine and the target temperature is smaller than the first temperature and larger than the second temperature; if so, the current temperature in the cavity of the centrifuge is taken as a reference temperature t a.
In the embodiment of the disclosure, the first temperature and the second temperature are set as threshold temperatures for judging whether the temperature in the cavity of the centrifugal machine is close to the target temperature. The difference between the current temperature in the chamber of the centrifuge and the target temperature is less than the first temperature and greater than the second temperature, indicating that the temperature in the chamber of the centrifuge is near the target temperature. Here, the values of the first temperature and the second temperature are set according to the need. For example, the temperature in the centrifuge chamber is set to be T 0, the target temperature is set to be T s, the first temperature is set to be T 1, and the second temperature is set to be T 2. Wherein the first temperature T 1 takes the value of 1.3 ℃ and the second temperature T 2 takes the value of-0.5 ℃. Then when T 0-Ts < 1.3 is greater than-0.5, it indicates that the temperature within the centrifuge chamber is approaching the target temperature.
In addition, the reference temperature t a is a change value, and when the difference between the current chamber temperature of the centrifuge and the target temperature is smaller than the first temperature and larger than the second temperature, the obtained current chamber temperature of the centrifuge is taken as the reference temperature. Thus, the temperature in the cavity of the centrifuge is detected in real time each time the temperature in the cavity of the centrifuge approaches the target temperature. And comparing the temperature with a reference temperature, and determining whether the temperature change is within a preset threshold value range according to the difference value of the temperature change and the reference temperature. Therefore, the rotating speed of the variable frequency compressor is regulated to regulate the temperature, so that the temperature in the cavity of the centrifugal machine gradually approaches the target temperature, and the condition that the temperature is overshot or slowly regulated by the traditional regulating mode is avoided.
Alternatively, steps S02 to S04 are periodically performed in the case where the difference between the current chamber temperature of the centrifuge and the target temperature is less than the first temperature and greater than the second temperature.
In the embodiment of the disclosure, steps S02 to S04 are periodically performed, and the rotation speed of the compressor can be correspondingly adjusted at a faster or slower adjusting speed according to the speed of the temperature change in the cavity. To improve the stability of temperature control. Here, the number of detection periods is set according to the need. In principle, the number of detection periods is not less than 4, for example, 5 detection periods may be set.
In some embodiments, a preset time period is set, and the following steps are periodically performed within the preset time period. Here, the preset time period includes a plurality of detection periods, that is, the preset time period is in a multiple relationship with the detection period. For example, the detection period is set to 2 seconds, and the preset time period is set to 10 seconds. The temperature in the chamber of the centrifuge is detected every 2 seconds for a preset period of 10 seconds. Optionally, the preset duration includes more than 4 detection periods.
After the rotational speed of the centrifuge was adjusted, the temperature in the chamber of the centrifuge was changed. Therefore, it is necessary to skip the cycle period to re-determine whether the temperature in the chamber of the centrifuge is less than the first temperature and greater than the second temperature. If so, the reference temperature is determined again, and steps S02 to S04 are periodically performed. When the absolute value of the difference deltat is smaller than a preset threshold value, the rotating speed of the variable frequency compressor does not need to be regulated. At this time, the next detection period is waited for, and the difference Δt between the temperature detection value t b and the reference temperature t a is continuously determined. So as to timely adjust the rotating speed of the variable frequency compressor under the condition that the absolute value of the difference value delta t is larger than or equal to a preset threshold value.
Alternatively, the detection period is set to be plural, or steps S02 to S04 are periodically performed within a set period.
In some embodiments, the detection period is set to 2 seconds and the number of detection periods is 4 periods. After the reference temperature t a is determined, then in the first detection period, a temperature detection value t b of the temperature in the chamber of the centrifuge is obtained. If the absolute value of the difference delta t between the temperature detection value t b and the reference temperature t a is smaller than a preset threshold value, the temperature change is shown to be in a reasonable range, and the rotating speed of the variable frequency compressor is not required to be regulated; waiting for the next detection period. If the absolute value of the difference deltat is larger than or equal to the preset threshold value in the second detection period, the rotating speed of the compressor needs to be regulated, and at the moment, the rotating speed of the compressor is regulated. It is understood that the temperature in the chamber is periodically detected when the absolute value of the difference Δt is smaller than a preset threshold value and the difference between the temperature in the chamber of the centrifuge and the target temperature is smaller than the first temperature and larger than the second temperature. Until the set detection times are met or the set time length is met. And when the absolute value of the difference delta t is greater than or equal to a preset threshold value, regulating the rotating speed of the variable frequency compressor, and jumping out of the cycle. It is necessary to re-determine whether the difference between the temperature in the chamber of the centrifuge and the target temperature satisfies the above condition. Therefore, the multi-cycle nested temperature control is adopted, and the quick adjustment or the slow adjustment of the rotating speed of the variable-frequency compressor is realized according to the speed of temperature change. Realizing the temperature control of the centrifugal machine and ensuring the stability of temperature change.
Optionally, in step S04, the centrifuge processor adjusts a rotation speed of the inverter compressor, including:
And under the condition that the temperature detection value t b is larger than the reference temperature t a and the rotating speed of the variable frequency compressor is smaller than the first rotating speed, increasing and increasing the rotating speed of the variable frequency compressor according to the setting. Or when the temperature detection value t b is smaller than the reference temperature t a and the rotating speed of the variable frequency compressor is larger than or equal to the second rotating speed, the rotating speed of the variable frequency compressor is reduced according to the set amplitude. Wherein the first rotational speed is greater than the second rotational speed.
In the embodiment of the disclosure, the first rotation speed is a preset value, and is used for defining a critical condition of a high rotation speed of the compressor. Here, the first rotation speed may take a value of 2950 rpm with a value of 2800 rpm to 2950 rpm. The value range of the set amplification or the set reduction is 40-80, the value can be 50, and the value of the set amplification or the set reduction can be different. The second rotation speed is a preset value and is used for defining the critical condition of the low rotation speed of the compressor. Here, the second rotation speed may take a value ranging from 1250 rpm to 1300 rpm, and the value may take a value of 1250 rpm.
The absolute value of the difference delta t between the temperature detection value t b and the reference temperature t a is larger than or equal to a preset threshold value, and the rotating speed of the variable frequency compressor is regulated. The temperature in the cavity is required to be further judged to be in the heating or cooling process, and then the rotating speed of the variable frequency compressor is regulated. Specifically, when the temperature detection value t b is greater than the reference temperature t a, it is indicated that the temperature in the cavity is rising. At this time, it is necessary to raise the rotational speed of the inverter compressor to reduce the speed of the temperature rise. And acquiring the current rotating speed of the compressor, and if the current rotating speed of the variable frequency compressor is smaller than the first rotating speed, indicating that the current rotating speed of the variable frequency compressor is lower, adjusting the rotating speed of the variable frequency compressor to increase the set rotating speed. When the temperature detection value t b is smaller than the reference temperature t a, it indicates that the temperature in the cavity is decreasing. At this time, it is necessary to reduce the inverter compressor rotation speed. Further, the current rotating speed of the variable frequency compressor is obtained, and if the current rotating speed of the variable frequency compressor is larger than or equal to the second rotating speed. The method shows that the current rotating speed of the variable frequency compressor is higher, and the rotating speed reduction of the variable frequency compressor can be adjusted. Therefore, through the variable frequency control of the variable frequency compressor, the stability of strong adaptability of the centrifugal machine is realized on one hand, the control of temperature is realized on the other hand, and the stability of the temperature is improved.
Optionally, in step S04, the centrifuge processor adjusts the rotation speed of the inverter compressor, and further includes:
And when the temperature detection value t b is larger than the reference temperature t a and the rotating speed of the variable frequency compressor is larger than or equal to the first rotating speed, adjusting the variable frequency compressor to operate at the highest rotating speed. Or in the case that the temperature detection value t b is smaller than the reference temperature t a and the rotating speed of the variable frequency compressor is smaller than the second rotating speed, the variable frequency compressor is regulated to operate at the lowest rotating speed.
In the embodiment of the disclosure, when the temperature detection value t b is greater than the reference temperature t a and the current rotation speed of the inverter compressor is greater than or equal to the first rotation speed. The temperature in the cavity is increased, the current rotating speed of the variable frequency compressor is higher, and the rotating speed increasing space is limited. In this case, the inverter compressor is controlled to operate at the highest rotational speed to achieve temperature stability. Likewise, in the case where the temperature detection value t b is smaller than the reference temperature t a and the rotation speed of the inverter compressor is smaller than the second rotation speed. Indicating that the temperature in the cavity is decreasing and the current rotating speed of the variable frequency compressor is low, and controlling the variable frequency compressor to operate at the lowest rotating speed. The temperature stability is realized through the frequency-reducing control of the variable-frequency compressor; meanwhile, the energy is saved.
As shown in connection with fig. 2, an embodiment of the present disclosure provides another method for centrifuge temperature control, comprising:
s15, when the difference value between the current temperature in the cavity of the centrifugal machine and the target temperature is larger than or equal to the first temperature or smaller than or equal to the second temperature, the centrifugal machine processor adjusts the rotating speed of the variable frequency compressor according to the difference value between the current temperature in the cavity of the centrifugal machine and the target temperature.
S01, determining a reference temperature t a by the centrifugal machine processor under the condition that the difference value between the current cavity temperature and the target temperature of the centrifugal machine is smaller than the first temperature and larger than the second temperature.
S02, detecting the temperature in the cavity of the centrifugal machine by using a temperature detection element to obtain a temperature detection value t b.
S03, the centrifugal machine processor calculates a difference delta t between the temperature detection value t b and the reference temperature t a.
S04, under the condition that the absolute value of the difference value delta t is larger than or equal to a preset threshold value, the centrifugal machine processor adjusts the rotating speed of the variable frequency compressor so as to enable the temperature in the cavity of the centrifugal machine to be close to the target temperature.
In the embodiment of the disclosure, when the difference between the current temperature in the cavity of the centrifuge and the target temperature is greater than or equal to the first temperature or less than or equal to the second temperature, the current temperature in the cavity of the centrifuge is far from the target temperature. And then the rotating speed of the variable frequency compressor is regulated according to the difference value between the current temperature in the cavity of the centrifugal machine and the target temperature. Specifically, when the difference between the current temperature in the cavity of the centrifugal machine and the target temperature is greater than or equal to the first temperature, the rotating speed of the variable frequency compressor is increased to a higher rotating speed. Or the rotational speed of the variable frequency compressor may be reduced to a lower rotational speed when the difference between the current chamber temperature of the centrifuge and the target temperature is less than or equal to the second temperature. In this way, a rapid adjustment of the temperature may be achieved such that the temperature within the chamber of the centrifuge approaches the target temperature at a faster rate.
Optionally, as shown in fig. 3, in step S15, the centrifuge processor adjusts the rotation speed of the inverter compressor according to the difference between the current chamber temperature and the target temperature of the centrifuge, including:
S51, controlling the variable-frequency compressor to operate at the highest rotating speed by the centrifugal machine processor under the condition that the difference value between the temperature in the centrifugal machine cavity and the target temperature is greater than or equal to the first temperature; and S52, when the difference between the temperature in the cavity of the centrifugal machine and the target temperature is smaller than or equal to the second temperature, the centrifugal machine processor adjusts the rotating speed of the variable frequency compressor according to the state of the centrifugal machine.
In the embodiment of the disclosure, when the current cavity temperature and the target temperature of the centrifugal machine are greater than or equal to the first temperature, the current cavity temperature of the centrifugal machine is far higher than the target temperature. In this case, therefore, the inverter compressor is controlled to operate at the highest rotational speed. The temperature in the cavity of the centrifugal machine is facilitated to be quickly reduced to be close to the target temperature, and quick response of the refrigerating temperature can be realized. And under the condition that the difference value between the temperature in the cavity of the centrifugal machine and the target temperature is smaller than or equal to the second temperature, adjusting the rotating speed of the variable frequency compressor according to the state of the centrifugal machine. In particular, the variable frequency compressor may be adjusted to operate at a lower rotational speed when the centrifuge is in an operational state. And in the stopping state, the variable frequency compressor is regulated to run at the rotating speed before stopping.
In some embodiments, the experimental centrifuge is primarily used in a cryogenic environment. Therefore, at start-up, the temperature in the centrifuge chamber is typically much higher than the target temperature. When the variable frequency compressor is started, the variable frequency compressor is controlled to operate at the highest rotating speed. After the variable frequency compressor operates at the highest rotating speed for a period of time, the difference between the temperature in the cavity of the centrifugal machine and the target temperature is smaller than or equal to the second temperature. Indicating that the temperature in the cavity of the centrifugal machine has fallen to a certain range below the target temperature, and adjusting the rotating speed of the variable frequency compressor according to the state of the centrifugal machine.
Optionally, in step S52, the centrifuge processor adjusts the rotation speed of the inverter compressor according to the state of the centrifuge, including:
If the centrifugal machine is in a first starting state, the centrifugal machine processor controls the variable frequency compressor to operate at the lowest rotating speed; if the centrifugal machine is in a non-first start-up starting state, the centrifugal machine processor controls the variable frequency compressor to operate at the rotating speed before adjustment.
In the embodiment of the disclosure, the first start-up of the centrifuge refers to starting up the centrifuge after setting parameters each time the centrifuge is used. After the variable frequency compressor operates at the highest rotating speed for a period of time and the temperature in the cavity of the centrifugal machine is reduced to a certain range below the target temperature, if the centrifugal machine is in a first starting state, the variable frequency compressor is reduced to the lowest rotating speed for operation. At this time, the temperature in the cavity of the centrifugal machine is relatively low, and the variable frequency compressor can be controlled to operate at a low rotating speed. On the one hand, the temperature in the cavity can be kept, and on the other hand, the energy conservation is facilitated. If the centrifuge is in a non-first start-up starting state, the centrifuge is stopped due to the fact that the temperature in the chamber of the centrifuge is too low. After the temperature is restored to a certain temperature range, the variable frequency compressor is controlled to operate at the rotating speed before stopping. In this way, it helps to maintain temperature stability.
Optionally, as shown in fig. 4, in step S15, the centrifuge processor adjusts the rotation speed of the inverter compressor according to the temperature in the centrifuge chamber, including:
S53, under the condition that the difference value between the current cavity temperature and the target temperature of the centrifugal machine is smaller than or equal to the second temperature and larger than the third temperature, the centrifugal machine processor keeps the rotation speed of the variable frequency compressor unchanged.
In the embodiment of the disclosure, when the difference between the current temperature in the cavity of the centrifuge and the target temperature is greater than the third temperature and less than or equal to the second temperature, the buffer stage is controlled by the centrifuge. The stage does not need to adjust the rotating speed, and the influence of refrigeration hysteresis on the adjusting mechanism can be prevented. After the current rotation speed of the variable frequency compressor is maintained, the temperature in the cavity of the centrifugal machine can be periodically detected under the condition that the difference value between the temperature in the cavity of the centrifugal machine and the target temperature is smaller than the first temperature and larger than the second temperature. And the rotating speed of the variable frequency compressor is regulated according to the temperature change.
S54, controlling the variable frequency compressor to stop by the centrifugal machine processor under the condition that the difference value between the current cavity temperature and the target temperature of the centrifugal machine is smaller than or equal to the third temperature; and controlling the variable frequency compressor to start and run at a rotational speed before shutdown under the condition that the difference between the temperature in the cavity of the centrifugal machine and the target temperature is greater than or equal to the first temperature; wherein the third temperature is less than the second temperature.
In the embodiment of the disclosure, when the difference between the current temperature in the cavity of the centrifugal machine and the target temperature is smaller than or equal to the third temperature, the temperature in the cavity of the centrifugal machine is shown to be far lower than the target temperature. Thus, in this case, the inverter compressor is controlled to stop so that the temperature in the chamber of the centrifuge rapidly rises to near the target temperature.
And after the variable frequency compressor is stopped for a period of time, the temperature in the cavity of the centrifugal machine is obtained again. And if the difference value between the temperature in the cavity of the centrifugal machine and the target temperature is greater than or equal to the first temperature, indicating that the temperature in the cavity of the centrifugal machine is increased, and recovering the rotating speed of the variable frequency compressor to the rotating speed before adjustment. In this way, the influence of refrigeration effect hysteresis on temperature regulation is avoided.
In practical use, as shown in figure 5,
Wherein, the first temperature T 1 takes a value of 1.3, the second temperature T 2 takes a value of 0.5, and the third temperature T 3 takes a value of-1.7, here, the three temperatures T 1、T2、T3 are used for judging the difference value condition between the temperature in the cavity of the centrifuge and the target temperature. T S is the target temperature, i is the preset number of detection cycles, where i is set equal to 4.
S401, running a centrifugal machine;
S402, judging whether the difference value between the temperature T 0 in the cavity of the centrifugal machine and the target temperature T S is larger than or equal to a first temperature T 1; if yes, executing S403, if not, executing S404;
s403, judging whether the variable frequency compressor is in an operating state, if so, executing S405; if not, S406 is performed.
S404, judging whether the difference between the temperature in the cavity of the centrifugal machine and the target temperature is smaller than or equal to a second temperature T 2, if yes, executing S407; if not, after delaying for a period of time, executing S404;
S405, controlling the variable frequency compressor to operate at the highest rotating speed, wherein Ra is the rotating speed of the variable frequency compressor; then S404 is performed;
s406, if the variable frequency compressor is stopped due to the excessively low temperature in the cavity, controlling the variable frequency compressor to run at the rotating speed before stopping, and then executing S410; if the inverter compressor is stopped for other reasons, controlling the inverter compressor to run at the highest rotation speed, and then executing S402;
s407, judging whether the centrifugal machine runs for the first time, if so, executing S408, otherwise, executing S409;
s408, controlling the variable frequency compressor to operate at the lowest rotation speed, and then executing S410;
s409, controlling the variable frequency compressor to run at a rotation speed before adjustment, and then executing S410;
s410, judging whether the difference between the temperature in the cavity of the centrifugal machine and the target temperature is larger than the second temperature T 2 and smaller than the first temperature T 1; if yes, executing S411; if not, after delaying for a period of time, executing S410;
s411, acquiring the temperature in the cavity of the centrifugal machine as a reference temperature value t a; then S412 is performed;
S412, periodically detecting the temperature in the cavity of the centrifugal machine to obtain a temperature detection value t b; then S413 is performed;
S413, judging whether the difference value between the temperature detection value t b and the reference temperature value t a is larger than or equal to a first threshold value, wherein the first threshold value takes a value of 0.3; if yes, executing S414; if not, executing S415;
S414, obtaining the rotating speed ra of the variable frequency compressor, and judging whether the current rotating speed is smaller than or equal to a first rotating speed, wherein the first rotating speed takes a value of 2950 revolutions per minute; if yes, executing S416; if not, executing S417;
S415, judging whether the difference value between the temperature detection value t b and the reference temperature value t a is smaller than or equal to a second threshold value, wherein the second threshold value takes a value of-0.3; if yes, execute S418; if not, executing S419;
S416, adjusting the rotating speed of the variable frequency compressor to increase the set rotating speed, wherein the set rotating speed takes 50 turns; the adjusted variable frequency compressor rotation speed ra=ra+50; then S402 is performed;
s417, controlling the variable frequency compressor to operate at the highest rotating speed; then S402 is performed;
s418, acquiring the rotating speed of the variable frequency compressor, and judging whether the rotating speed of the variable frequency compressor is larger than or equal to a second rotating speed, wherein the second rotating speed takes 1250 revolutions per minute; if yes, executing S420; if not, executing S421;
S419, judging whether the temperature in the cavity of the current centrifugal machine and the target temperature are higher than the second temperature and lower than the first temperature; if yes, executing S422; if not, executing S423;
s420, adjusting the rotating speed of the variable frequency compressor to reduce the set rotating speed, wherein the set rotating speed takes 50 turns; the regulated variable frequency compressor rotating speed Ra=ra-50; then S402 is performed;
s421, controlling the variable frequency compressor to operate at the lowest rotation speed; then S402 is performed;
s422, judging whether the detection period is greater than or equal to the preset times, wherein the preset times are 4 times, if yes, executing S410; if not, executing S412;
s423; judging whether the temperature in the cavity of the current centrifugal machine and the target temperature are smaller than or equal to a third temperature T 3 or not, wherein the value of the third temperature is-1.7; if yes; s424 is performed; if not, S402 is performed.
The embodiment of the disclosure provides a device for controlling the temperature of a centrifugal machine, which comprises a determining module, a detecting module, a calculating module and an adjusting module. The determination module is configured to determine a reference temperature t a. The detection module is configured to detect a temperature in the centrifuge chamber to obtain a temperature detection value tb. The calculation module is configured to calculate a difference Δt between the temperature detection t b and the reference temperature t a. The adjustment module is configured to adjust a rotational speed of the variable frequency compressor to bring the temperature within the chamber of the centrifuge to approximately the target temperature if the absolute value of Δt is greater than or equal to a preset threshold.
By adopting the device for controlling the temperature of the centrifugal machine, which is provided by the embodiment of the disclosure, the rotating speed of the variable frequency compressor can be adjusted based on the temperature in the cavity of the centrifugal machine, so that the temperature in the cavity of the centrifugal machine is more stable.
As shown in connection with fig. 6, an embodiment of the present disclosure provides an apparatus for centrifuge temperature control, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may invoke logic instructions in the memory 101 to perform the method for centrifuge temperature control of the above-described embodiments.
Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.
The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by running program instructions/modules stored in the memory 101, i.e. implements the method for centrifuge temperature control in the above-described embodiments.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides a centrifugal machine, which comprises the device for controlling the temperature of the centrifugal machine.
Embodiments of the present disclosure provide a storage medium storing computer-executable instructions configured to perform the above-described method for centrifuge temperature control.
The storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.
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 plurality of media capable of storing program codes, such as 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 a transitory storage medium.
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 (7)
1. A method for temperature control of a centrifuge including a refrigeration system comprised of a variable frequency compressor, an evaporator, a condenser, and a thermal expansion valve, the method comprising:
Determining a reference temperature t a; wherein, t a is a change value, and t a is the current temperature in the cavity of the centrifuge when the difference between the current temperature in the cavity of the centrifuge and the target temperature is smaller than the first temperature and larger than the second temperature;
Detecting the temperature in the cavity of the centrifugal machine to obtain a temperature detection value t b;
calculating a difference delta t between the temperature detection value t b and the reference temperature t a;
Under the condition that the absolute value of delta t is larger than or equal to a preset threshold value, the rotating speed of the variable frequency compressor is adjusted to enable the temperature in the cavity of the centrifugal machine to be close to the target temperature; the method comprises the steps of adjusting the rotating speed of the variable frequency compressor, wherein the step of increasing and increasing the rotating speed of the variable frequency compressor according to a setting when the temperature detection value t b is larger than the reference temperature t a and the rotating speed of the variable frequency compressor is smaller than the first rotating speed; or when the temperature detection value t b is smaller than the reference temperature t a and the rotating speed of the variable frequency compressor is larger than or equal to the second rotating speed, reducing the rotating speed of the variable frequency compressor according to the set amplitude reduction; the first rotational speed is greater than the second rotational speed;
When the difference value between the current cavity temperature of the centrifugal machine and the target temperature is larger than or equal to the first temperature or smaller than or equal to the second temperature, the rotating speed of the variable frequency compressor is adjusted according to the difference value between the current cavity temperature of the centrifugal machine and the target temperature; the method comprises the steps of adjusting the rotating speed of the variable frequency compressor according to the difference value between the current cavity temperature of the centrifugal machine and the target temperature, wherein the step of controlling the variable frequency compressor to operate at the highest rotating speed under the condition that the difference value between the current cavity temperature of the centrifugal machine and the target temperature is greater than or equal to a first temperature; and under the condition that the difference value between the current temperature in the cavity of the centrifugal machine and the target temperature is smaller than or equal to the second temperature, adjusting the rotating speed of the variable frequency compressor according to the state of the centrifugal machine.
2. The method of claim 1, wherein the temperature in the chamber of the centrifuge is periodically sensed to obtain a temperature sensing value t b, and the rotational speed of the inverter compressor is periodically adjusted.
3. The method as recited in claim 1, further comprising:
When the temperature detection value t b is larger than the reference temperature t a and the rotating speed of the variable frequency compressor is larger than or equal to the first rotating speed, the variable frequency compressor is regulated to operate at the highest rotating speed; or alternatively
In case the temperature detection value t b is smaller than the reference temperature t a and the rotational speed of the inverter compressor is smaller than said second rotational speed, the inverter compressor is adjusted to operate at the lowest rotational speed.
4. The method of claim 1, wherein adjusting the rotational speed of the inverter compressor based on the state of the centrifuge comprises:
if the centrifugal machine is in a first starting state, controlling the variable frequency compressor to operate at the lowest rotating speed;
and if the centrifugal machine is in a starting state of not starting for the first time, controlling the variable frequency compressor to run at the rotating speed before adjustment.
5. The method of claim 1, wherein adjusting the rotational speed of the variable frequency compressor based on the current temperature of the chamber of the centrifuge comprises:
When the difference between the current temperature in the cavity of the centrifugal machine and the target temperature is smaller than or equal to the second temperature and larger than the third temperature, the rotating speed of the variable frequency compressor is kept unchanged; or alternatively
Controlling the variable frequency compressor to stop under the condition that the difference value between the current temperature in the cavity of the centrifugal machine and the target temperature is smaller than or equal to the third temperature; and is combined with the other components of the water treatment device,
Controlling the variable frequency compressor to start and run at the rotating speed before stopping under the condition that the difference value between the current temperature in the cavity of the centrifugal machine and the target temperature is larger than or equal to the first temperature;
Wherein the third temperature is less than the second temperature.
6. An apparatus for centrifuge temperature control comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for centrifuge temperature control of any of claims 1 to 5 when the program instructions are run.
7. A centrifuge comprising a refrigeration system comprised of a variable frequency compressor, an evaporator, a condenser, and a thermal expansion valve, further comprising the apparatus for temperature control of the centrifuge of claim 6.
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