CN114353361A - Method and device for controlling refrigeration and freezing unit and refrigeration and freezing unit - Google Patents
Method and device for controlling refrigeration and freezing unit and refrigeration and freezing unit Download PDFInfo
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- CN114353361A CN114353361A CN202210017391.2A CN202210017391A CN114353361A CN 114353361 A CN114353361 A CN 114353361A CN 202210017391 A CN202210017391 A CN 202210017391A CN 114353361 A CN114353361 A CN 114353361A
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- 230000008014 freezing Effects 0.000 title claims abstract description 91
- 238000007710 freezing Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000005057 refrigeration Methods 0.000 title claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 117
- 239000007788 liquid Substances 0.000 claims abstract description 35
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- 239000003507 refrigerant Substances 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
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- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
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Abstract
The application relates to the technical field of refrigeration, and discloses a method for controlling a refrigeration and freezing unit, wherein the refrigeration and freezing unit comprises: the heating device is arranged on a high-pressure liquid storage device of the exhaust passage of the compressor and is controlled by the processor to be opened to heat the high-pressure liquid storage device or closed to stop heating; the method comprises the following steps: determining a discharge side pressure of the compressor and an operation state of the compressor; the on-off state of the heating device is controlled according to the discharge side pressure of the compressor and the running state of the compressor, so that the pressure difference between the discharge side and the suction side of the compressor is kept in a proper range. In cold environment in winter, the method sets a heating device on a high-pressure liquid storage device of an exhaust passage of the compressor, and controls the on-off of the heating device according to the exhaust side pressure of the compressor and the running state of the compressor, so that the pressure difference between the exhaust side and the suction side of the compressor is kept in a proper range, the condensing pressure is increased, and the condition that the compressor is stopped by mistake due to low-pressure protection of the suction side when the compressor cannot be started or is started for a short time is avoided.
Description
Technical Field
The present application relates to the field of refrigeration technology, and for example, to a method and an apparatus for controlling a refrigeration and freezing unit, and a storage medium.
Background
At present, in cold environments in winter, a common medium-temperature refrigeration and freezing unit is easy to start and stop for many times, and a compressor fault or the service life of the compressor is shortened.
In the existing starting method of an air conditioner compressor, a heating device is arranged at the bottom of the compressor, and the heating device is in a closed state when the air conditioner is turned off, and the method comprises the following steps: operating the compressor at a lowest frequency upon initial start-up; acquiring the exhaust superheat degree of a compressor in real time; and comparing the exhaust superheat degree of the compressor with a plurality of set thresholds in sequence, and gradually increasing the frequency of the compressor in layers according to the comparison result and selectively starting the heating device.
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:
the heating device of the compressor directly heats the air inlet and exhaust temperature of the compressor, and has poor effect of improving the condensation pressure in cold environment in winter, and the compressor cannot be started or can be stopped by mistake due to low-pressure protection at the air suction side in a short time when being started.
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 nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a method and a device for controlling a refrigeration and freezing unit, the refrigeration and freezing unit and a storage medium, so that the condensation pressure is increased in a cold environment in winter, and the condition that the compressor cannot be started or is stopped by mistake due to low-pressure protection at the air suction side in a short time when the compressor is started is avoided.
In some embodiments, the refrigeration-freezer unit comprises: the heating device is arranged on a high-pressure liquid storage device of the exhaust passage of the compressor and is controlled by the processor to be opened to heat the high-pressure liquid storage device or closed to stop heating; the method comprises the following steps:
determining a discharge side pressure of the compressor and an operation state of the compressor;
the on-off state of the heating device is controlled according to the discharge side pressure of the compressor and the running state of the compressor, so that the pressure difference between the discharge side and the suction side of the compressor is kept in a proper range.
In some embodiments, the apparatus comprises a processor and a memory storing program instructions, the processor being configured, when executing the program instructions, to perform the method for controlling a refrigeration and freezing assembly described above.
In some embodiments, the refrigeration-freezer unit comprises:
means for controlling a refrigeration and freezing assembly as described above;
and the heating device is arranged on the high-pressure liquid storage device of the compressor exhaust passage and is controlled by the processor to be opened to heat the high-pressure liquid storage device or closed to stop heating.
In some embodiments, the storage medium stores program instructions that, when executed, perform the method for controlling a refrigeration chiller unit described above.
The method and the device for controlling the refrigeration and freezing unit, the refrigeration and freezing unit and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:
in cold environment in winter, the heating device is arranged on the high-pressure liquid storage device of the compressor exhaust passage, and the switch of the heating device is controlled according to the exhaust side pressure of the compressor and the running state of the compressor, so that the high-pressure liquid storage device on the exhaust side of the compressor is heated or stopped heating, the pressure difference between the exhaust side and the suction side of the compressor is kept in a proper range, the condensing pressure is increased, and the condition that the compressor cannot be started or is stopped by mistake due to low-pressure protection on the suction side in a short time when the compressor is started is avoided.
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 in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a block diagram of a refrigeration unit provided in accordance with an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a method for controlling a refrigeration chiller unit according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of another method for controlling a refrigeration chiller unit provided by an embodiment of the present disclosure;
fig. 4 is a schematic diagram of another method for controlling a refrigeration chiller unit provided by an embodiment of the present disclosure;
fig. 5 is a schematic diagram of another method for controlling a refrigeration chiller unit provided by an embodiment of the present disclosure;
fig. 6 is a schematic diagram of an apparatus for controlling a refrigeration and freezing assembly according to an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. 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 be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
The term "correspond" may refer to an association or binding relationship, and a corresponds to B refers to an association or binding relationship between a and B.
Referring to fig. 1, an embodiment of the present disclosure provides a refrigerating and freezing unit including a heating device 3. And the heating device 3 is arranged on the high-pressure liquid storage device 2 of the exhaust passage 7 of the compressor 1 and is controlled by the processor to be opened to heat the high-pressure liquid storage device 2 or be closed to stop heating.
Optionally, the heating device 3 comprises one or more of an electrical heating strip, an electrical heating pack.
Optionally, the heating device 3 is arranged at the lower end of the high pressure reservoir 2.
Optionally, the refrigerating and freezing unit further comprises a high pressure sensor 4 for detecting the compressor discharge side pressure. The high pressure sensor 4 is provided in the compressor discharge passage 7.
Optionally, the freezer-refrigerator unit further comprises a low pressure sensor 5 for detecting the compressor inlet side pressure. The low pressure sensor 5 is provided in the compressor intake passage 6.
The freezing and refrigerating unit provided by the embodiment of the disclosure can be used for heating or stopping heating the high-pressure liquid storage device on the exhaust side of the compressor by controlling the switch of the heating device through arranging the heating device on the high-pressure liquid storage device on the exhaust passage of the compressor in the cold environment in winter, so that the pressure difference between the exhaust side and the suction side of the compressor is kept in a proper range, the condensing pressure is increased, and the condition that the compressor cannot be started or is mistakenly stopped due to low-pressure protection on the suction side in a short time when the compressor is started is avoided.
With reference to fig. 2, an embodiment of the present disclosure provides a method for controlling a refrigeration and freezing unit, including:
s201, the refrigerating and freezing unit determines the air discharge side pressure of the compressor and the running state of the compressor.
S202, according to the pressure of the exhaust side of the compressor and the running state of the compressor, the refrigerating and freezing unit controls the on-off state of the heating device so as to keep the pressure difference between the exhaust side and the suction side of the compressor in a proper range.
By adopting the method for controlling the refrigerating and freezing unit provided by the embodiment of the disclosure, the heating device is arranged on the high-pressure liquid storage device of the exhaust passage of the compressor in cold environment in winter, and the switch of the heating device is controlled according to the exhaust side pressure of the compressor and the running state of the compressor, so that the high-pressure liquid storage device on the exhaust side of the compressor is heated or stopped heating, the pressure difference between the exhaust side and the suction side of the compressor is kept in a proper range, the condensing pressure is increased, and the condition that the compressor cannot be started or can be stopped by mistake due to low-pressure protection on the suction side in a short time when the compressor is started is avoided.
Optionally, the refrigerating and freezing unit controls the on-off state of the heating device according to the discharge side pressure of the compressor and the running state of the compressor, and comprises: and under the condition that the running state of the compressor is the running mode, the refrigerating and freezing unit controls the on-off state of the heating device according to the pressure of the air discharge side of the compressor and a first preset pressure threshold value. And under the condition that the running state of the compressor is in the standby mode, the refrigerating and freezing unit controls the on-off state of the heating device according to the pressure of the exhaust side of the compressor and a second preset pressure threshold value. Therefore, under the condition that the compressor is in the running mode, the on-off of the heating device is controlled according to the pressure of the exhaust side of the compressor and the first preset pressure threshold value, so that the pressure difference between the exhaust side and the suction side of the compressor is kept in a proper range, the condensing pressure is increased, and the phenomenon that the compressor is stopped by mistake due to low-pressure protection of the suction side when the compressor is started for a short time is avoided. And under the condition that the compressor is in a standby mode, controlling the switch of the heating device according to the exhaust side pressure of the compressor and a second preset pressure threshold value, and heating or stopping heating the high-pressure liquid storage device at the exhaust side of the compressor to keep the pressure difference between the exhaust side and the suction side of the compressor in a proper range, so that the condensing pressure is increased, and the compressor cannot be started. Thereby avoiding damage to the compressor.
Optionally, the second preset pressure threshold is greater than the first preset pressure threshold. Therefore, under the condition that the compressor is in a standby stage, the air inlet side and the air outlet side of the compressor are needed, and the compressor can be normally started only when a higher pressure difference needs to be established in the running state relative to the compressor, so that the second preset pressure threshold value is larger than the first preset pressure threshold value to ensure that the compressor can be started normally once and then normally runs. Therefore, the problems that the compressor is frequently started and stopped and the compressor is damaged due to too small front and back pressure difference are better avoided.
Optionally, the refrigerating and freezing unit controls the on-off state of the heating device according to the discharge side pressure of the compressor and a first preset pressure threshold, and includes: and under the condition that the pressure on the exhaust side of the compressor is less than or equal to a first preset pressure threshold value, the refrigerating and freezing unit controls the heating device to be started. Or, the refrigerating and freezing unit controls the heating device to be closed under the condition that the pressure on the exhaust side of the compressor is greater than a first preset pressure threshold value. Therefore, under the condition that the running state of the refrigerating and freezing unit is in the running mode, the on-off state of the heating device is controlled better according to the size relation between the air exhaust side pressure of the compressor and the first preset pressure threshold value, the high-pressure liquid storage device on the air exhaust side of the compressor is heated or stopped to heat, the condition that the pressure difference between the air exhaust side and the air suction side of the compressor is too high or too low is avoided, the compressor is kept in a proper range better, the condensing pressure is improved better, and the condition that the starting is carried out for a short time and the shutdown is mistakenly carried out due to the low-pressure protection on the air suction side is avoided. Thereby avoiding damage to the compressor.
Optionally, after the refrigerating and freezing unit controls the heating device to be turned on, the method further includes: the refrigerating and freezing unit controls the heating device to be continuously opened or closed according to the air exhaust side pressure of the compressor, a first preset pressure threshold value and a preset pressure difference threshold value. Therefore, under the condition that the running state of the refrigerating and freezing unit is in the running mode, the on-off state of the heating device is controlled better according to the size relation between the air exhaust side pressure of the compressor and the first preset pressure threshold value and the preset pressure difference threshold value, the high-pressure liquid storage device on the air exhaust side of the compressor is heated or stopped to be heated, the condition that the pressure difference between the air exhaust side and the air suction side of the compressor is too high or too low is avoided, the compressor is kept in a proper range better, the condensing pressure is improved better, and the condition that the compressor is stopped by mistake due to low-pressure protection on the air suction side in a short starting time is avoided. Thereby avoiding damage to the compressor.
Optionally, the refrigerating and freezing unit controls the heating device to be continuously turned on or off according to the air discharge side pressure of the compressor, a first preset pressure threshold and a preset pressure difference threshold, and includes: and under the condition that the pressure on the exhaust side of the compressor is less than or equal to the sum of a first preset pressure threshold and a preset pressure difference threshold, the refrigerating and freezing unit controls the heating device to be continuously opened. And under the condition that the pressure on the exhaust side of the compressor is greater than the sum of the first preset pressure threshold and the preset pressure difference threshold, the refrigerating and freezing unit controls the heating device to be closed. Therefore, under the condition that the running state of the refrigerating and freezing unit is in the running mode, the on-off state and the heating time of the heating device can be controlled better according to the size relation of the air exhaust side pressure of the compressor, the first preset pressure threshold and the preset pressure difference threshold, the high-pressure liquid storage device on the air exhaust side of the compressor is heated or stopped heating, the condition that the pressure difference between the air exhaust side and the air suction side of the compressor is too high or too low is avoided, the compressor is kept in a proper range better, the condensing pressure is improved better, and the phenomenon that the compressor is stopped by mistake due to low-pressure protection on the air suction side when the compressor is started for a short time is avoided. Thereby avoiding damage to the compressor.
Optionally, the refrigerating and freezing unit controls the on-off state of the heating device according to the air discharge side pressure of the compressor and a second preset pressure threshold, and includes: and under the condition that the pressure on the exhaust side of the compressor is less than or equal to a second preset pressure threshold value, the refrigerating and freezing unit controls the heating device to be started. Or, under the condition that the pressure on the exhaust side of the compressor is greater than a second preset pressure threshold value, the refrigerating and freezing unit controls the heating device to be closed. Therefore, under the condition that the running state of the refrigerating and freezing unit is in the standby mode, the on-off state of the heating device is favorably controlled according to the size relation between the air exhaust side pressure of the compressor and the second preset pressure threshold value, the high-pressure liquid storage device on the air exhaust side of the compressor is heated or stopped to heat, the condition that the pressure difference between the air exhaust side and the air suction side of the compressor is too high or too low is avoided, the proper range is kept better, the condensing pressure is improved better, and the condition that the compressor cannot be started is avoided. Thereby avoiding damage to the compressor.
Optionally, after the refrigerating and freezing unit controls the heating device to be turned on, the method further includes: the refrigerating and freezing unit controls the heating device to be continuously opened or closed according to the air exhaust side pressure of the compressor, a second preset pressure threshold value and a preset pressure difference threshold value. Therefore, under the condition that the running state of the refrigerating and freezing unit is in the standby mode, the on-off state of the heating device is favorably controlled according to the size relation between the air exhaust side pressure of the compressor and the second preset pressure threshold value and the preset pressure difference threshold value, the high-pressure liquid storage device on the air exhaust side of the compressor is heated or stopped heating, the condition that the pressure difference between the air exhaust side and the air suction side of the compressor is too high or too low is avoided, the proper range is better kept, the condensing pressure is better increased, and the condition that the compressor cannot be started is avoided. Thereby avoiding damage to the compressor.
Optionally, the refrigerating and freezing unit controls the heating device to be continuously turned on or off according to the air discharge side pressure of the compressor, a second preset pressure threshold and a preset pressure difference threshold, and includes: and under the condition that the pressure on the exhaust side of the compressor is less than or equal to the sum of a second preset pressure threshold and a preset pressure difference threshold, the refrigerating and freezing unit controls the heating device to be continuously opened. And under the condition that the pressure on the exhaust side of the compressor is greater than the sum of the second preset pressure threshold and the preset pressure difference threshold, the refrigerating and freezing unit controls the heating device to be closed. Therefore, under the condition that the running state of the refrigerating and freezing unit is in the running mode, the on-off state and the heating time of the heating device can be controlled better according to the magnitude relation of the air discharge side pressure of the compressor, the second preset pressure threshold and the preset pressure difference threshold, the high-pressure liquid storage device on the air discharge side of the compressor is heated or stopped heating, the over-high or over-low pressure difference between the air discharge side and the air suction side of the compressor is avoided, and the proper range is better kept.
Optionally, the first preset pressure threshold is associated with a value of a type of the refrigerant, where the value is [12barg, 18barg ]. In particular, in the case where the refrigerant is of type R410A, the value of the first preset pressure threshold may be 18 barg. Therefore, under the condition that the compressor is in the running mode, different first preset pressure thresholds can be determined according to the refrigerant, the switch of the heating device is controlled by the air discharge side pressure of the compressor and the first preset pressure threshold, the pressure difference between the air discharge side and the air suction side of the compressor is kept in a proper range, the condensing pressure is improved, and the condition that the compressor is stopped by mistake due to low-pressure protection of the air suction side when the compressor is started for a short time is avoided.
Optionally, the second preset pressure threshold is associated with a value of a type of the refrigerant, where the value range is [12barg, 25barg ]. In particular, in the case where the refrigerant is of type R410A, the value of the second preset pressure threshold may be 25 barg. Therefore, under the condition that the compressor is in a standby mode, different second preset pressure thresholds can be determined according to the refrigerant, the on-off of the heating device is controlled according to the exhaust side pressure of the compressor and the second preset pressure thresholds, the high-pressure liquid storage device on the exhaust side of the compressor is heated or stopped from heating, the pressure difference between the exhaust side and the suction side of the compressor is kept in a proper range, the condensing pressure is increased, and the phenomenon that the compressor is stopped by mistake due to low-pressure protection on the suction side when the compressor is started for a short time is avoided. Thereby avoiding damage to the compressor.
Optionally, a value range of the correlation between the preset differential pressure threshold and the system pressure fluctuation and the pressure control precision is [0, 3barg ]. In particular, the value of the preset differential pressure threshold may be 2 barg. Therefore, the value of the preset pressure difference threshold is better determined according to the system pressure fluctuation and the pressure control precision of different freezing and refrigerating units, the switch of the heating device is favorably controlled according to the exhaust side pressure of the compressor and the running state of the compressor, the high-pressure liquid storage device on the exhaust side of the compressor is favorably heated or stopped heating, the pressure difference between the exhaust side and the suction side of the compressor is better kept in a proper range, the condensing pressure is better improved, and the condition that the compressor cannot be started or is started for a short time and is mistakenly shut down due to low-pressure protection on the suction side is better avoided.
With reference to fig. 3, another method for controlling a refrigeration and freezing assembly is provided in an embodiment of the present disclosure, which includes:
s301, the refrigerating and freezing unit determines the air discharge side pressure of the compressor and the running state of the compressor.
And S302, judging the running state of the compressor by the refrigerating and freezing unit.
And S303, under the condition that the running state of the compressor is the running mode, the refrigerating and freezing unit judges the magnitude relation between the pressure of the exhaust side of the compressor and a first preset pressure threshold value.
And S304, controlling the heating device to be started by the refrigerating and freezing unit under the condition that the pressure on the exhaust side of the compressor is less than or equal to a first preset pressure threshold value.
And S305, controlling the heating device to be continuously opened or closed by the refrigerating and freezing unit according to the air discharge side pressure of the compressor, the first preset pressure threshold and the preset pressure difference threshold.
And S306, controlling the heating device to be closed by the refrigerating and freezing unit under the condition that the pressure on the exhaust side of the compressor is greater than a first preset pressure threshold value.
And S307, under the condition that the running state of the compressor is in the standby mode, the refrigerating and freezing unit controls the on-off state of the heating device according to the pressure of the exhaust side of the compressor and a second preset pressure threshold value.
By adopting the method for controlling the refrigerating and freezing unit provided by the embodiment of the disclosure, the on-off state of the heating device can be controlled better according to the relation between the exhaust side pressure of the compressor and the first preset pressure threshold value and the preset pressure difference threshold value under the condition that the running state of the refrigerating and freezing unit is in the running mode in winter, the high-pressure liquid storage device on the exhaust side of the compressor is heated or stopped from heating, the condition that the pressure difference between the exhaust side and the suction side of the compressor is too high or too low is avoided, the compressor is better kept in a proper range, the condensing pressure is better increased, and the condition that the compressor is stopped by mistake due to the low-pressure protection on the suction side when the compressor is started for a short time is avoided. Thereby avoiding damage to the compressor. And under the condition that the compressor is in a standby mode, the switch of the heating device is controlled according to the exhaust side pressure of the compressor and a second preset pressure threshold value, the high-pressure liquid storage device on the exhaust side of the compressor is heated or stopped from heating, so that the pressure difference between the exhaust side and the suction side of the compressor is kept in a proper range, the condensing pressure is increased, the compressor cannot be started, and the compressor is prevented from being damaged.
With reference to fig. 4, another method for controlling a refrigeration and freezing assembly is provided in an embodiment of the present disclosure, which includes:
s401, the refrigeration and freezing unit determines the air discharge side pressure of the compressor and the running state of the compressor.
And S402, judging the running state of the compressor by the refrigerating and freezing unit.
And S403, controlling the on-off state of the heating device by the refrigerating and freezing unit according to the pressure of the exhaust side of the compressor and the first preset pressure threshold value when the running state of the compressor is the running mode.
And S404, judging the magnitude relation between the air discharge side pressure of the compressor and a second preset pressure threshold value by the refrigerating and freezing unit when the running state of the compressor is in the standby mode.
And S405, controlling the heating device to be started by the refrigerating and freezing unit under the condition that the pressure on the exhaust side of the compressor is less than or equal to a second preset pressure threshold value.
And S406, the refrigerating and freezing unit controls the heating device to be continuously opened or closed according to the air discharge side pressure of the compressor, the second preset pressure threshold and the preset pressure difference threshold.
And S407, controlling the heating device to be closed by the refrigerating and freezing unit under the condition that the pressure on the exhaust side of the compressor is greater than a second preset pressure threshold value.
By adopting the method for controlling the refrigerating and freezing unit provided by the embodiment of the disclosure, the on-off state of the heating device can be controlled better according to the relationship between the exhaust side pressure of the compressor and the second preset pressure threshold value and the preset pressure difference threshold value under the cold environment in winter and under the condition that the running state of the refrigerating and freezing unit is in the standby mode, the high-pressure liquid storage device on the exhaust side of the compressor is heated or stopped from heating, the condition that the pressure difference between the exhaust side and the suction side of the compressor is too high or too low is avoided, the proper range is better kept, the condensing pressure is better increased, and the condition that the compressor cannot be started is avoided. Thereby avoiding damage to the compressor. Under the condition that the compressor is in the running mode, the switch of the heating device is controlled according to the pressure of the exhaust side of the compressor and a first preset pressure threshold value, so that the pressure difference between the exhaust side and the suction side of the compressor is kept in a proper range, the condensing pressure is increased, and the condition that the compressor is started for a short time and is shut down by mistake due to low-pressure protection of the suction side is avoided.
With reference to fig. 5, another method for controlling a refrigeration and freezing assembly is provided in an embodiment of the present disclosure, which includes:
s501, the refrigerating and freezing unit determines the air exhaust side pressure of the compressor and the running state of the compressor.
And S502, judging the running state of the compressor by the refrigerating and freezing unit.
And S503, when the running state of the compressor is in the running mode, the refrigerating and freezing unit judges the magnitude relation between the pressure of the exhaust side of the compressor and the first preset pressure threshold value.
And S504, under the condition that the pressure on the exhaust side of the compressor is less than or equal to a first preset pressure threshold value, the refrigerating and freezing unit controls the heating device to be started.
And S505, the refrigerating and freezing unit controls the heating device to be continuously opened or closed according to the air exhaust side pressure of the compressor, the first preset pressure threshold and the preset pressure difference threshold.
And S506, controlling the heating device to be closed by the refrigerating and freezing unit under the condition that the pressure on the exhaust side of the compressor is greater than a first preset pressure threshold value.
And S507, judging the magnitude relation between the exhaust side pressure of the compressor and a second preset pressure threshold value by the refrigerating and freezing unit under the condition that the running state of the compressor is in the standby mode.
And S508, controlling the heating device to be started by the refrigerating and freezing unit under the condition that the pressure on the exhaust side of the compressor is less than or equal to a second preset pressure threshold value.
And S509, controlling the heating device to be continuously opened or closed by the refrigerating and freezing unit according to the pressure of the exhaust side of the compressor, a second preset pressure threshold and a preset pressure difference threshold.
And S510, controlling the heating device to be closed by the refrigerating and freezing unit under the condition that the pressure on the exhaust side of the compressor is greater than a second preset pressure threshold value.
By adopting the method for controlling the refrigerating and freezing unit provided by the embodiment of the disclosure, the on-off state of the heating device can be controlled better according to the relation between the exhaust side pressure of the compressor and the first preset pressure threshold value and the preset pressure difference threshold value under the condition that the running state of the refrigerating and freezing unit is in the running mode in winter, the high-pressure liquid storage device on the exhaust side of the compressor is heated or stopped from heating, the condition that the pressure difference between the exhaust side and the suction side of the compressor is too high or too low is avoided, the compressor is better kept in a proper range, the condensing pressure is better increased, and the condition that the compressor is stopped by mistake due to the low-pressure protection on the suction side when the compressor is started for a short time is avoided. Thereby avoiding damage to the compressor. In cold environment in winter, and under the condition that the running state of the refrigerating and freezing unit is in a standby mode, the on-off state of the heating device is controlled better according to the relation between the exhaust side pressure of the compressor and the second preset pressure threshold value and the preset pressure difference threshold value, the high-pressure liquid storage device on the exhaust side of the compressor is heated or stopped heating, the condition that the pressure difference between the exhaust side and the suction side of the compressor is too high or too low is avoided, the compressor is kept in a proper range better, the condensing pressure is improved better, and the compressor cannot be started is avoided. Thereby avoiding damage to the compressor.
As shown in fig. 6, an apparatus for controlling a refrigeration and freezing unit according to an embodiment of the present disclosure includes a processor (processor)600 and a memory (memory) 601. Optionally, the apparatus may also include a Communication Interface 602 and a bus 603. The processor 600, the communication interface 602, and the memory 601 may communicate with each other via a bus 603. The communication interface 602 may be used for information transfer. The processor 600 may invoke logic instructions in the memory 601 to perform the method for controlling a refrigeration chiller unit of the above-described embodiments.
In addition, the logic instructions in the memory 601 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 601 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 600 executes functional applications and data processing by executing program instructions/modules stored in the memory 601, i.e. implements the method for controlling a refrigeration and freezing unit in the above-described embodiments.
The memory 601 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 601 may include a high speed random access memory, and may also include a non-volatile memory.
The embodiment of the disclosure provides a refrigeration and freezing unit, which comprises the device for controlling the refrigeration and freezing unit and a heating device. And the heating device is arranged on the high-pressure liquid storage device of the compressor exhaust passage and is controlled by the processor to be opened to heat the high-pressure liquid storage device or closed to stop heating.
Embodiments of the present disclosure provide a computer-readable storage medium having stored thereon computer-executable instructions configured to perform the above-described method for controlling a refrigeration and freezing assembly.
Embodiments of the present disclosure provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described method for controlling a refrigeration and freezing unit.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify 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. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "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 application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, 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 an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would 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 may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart 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 disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (10)
1. A method for controlling a refrigeration chiller unit, the refrigeration chiller unit comprising: the heating device is arranged on a high-pressure liquid storage device of the exhaust passage of the compressor and is controlled by the processor to be opened to heat the high-pressure liquid storage device or closed to stop heating; the method comprises the following steps:
determining a discharge side pressure of the compressor and an operation state of the compressor;
the on-off state of the heating device is controlled according to the discharge side pressure of the compressor and the running state of the compressor, so that the pressure difference between the discharge side and the suction side of the compressor is kept in a proper range.
2. The method of claim 1, wherein controlling the on-off state of the heating device according to the discharge side pressure of the compressor and the operating state of the compressor comprises:
under the condition that the running state of the compressor is the running mode, controlling the on-off state of the heating device according to the pressure on the exhaust side of the compressor and a first preset pressure threshold value;
and under the condition that the running state of the compressor is in the standby mode, controlling the on-off state of the heating device according to the pressure of the exhaust side of the compressor and a second preset pressure threshold value.
3. The method of claim 2, wherein the second preset pressure threshold is greater than the first preset pressure threshold.
4. The method according to claim 2, wherein said controlling the on-off state of the heating device according to the discharge side pressure of the compressor and the first preset pressure threshold comprises:
controlling the heating device to be started under the condition that the pressure on the exhaust side of the compressor is less than or equal to a first preset pressure threshold value; alternatively, the first and second electrodes may be,
and controlling the heating device to be closed under the condition that the pressure on the exhaust side of the compressor is greater than a first preset pressure threshold value.
5. The method of claim 4, wherein after the controlling the heating device to turn on, further comprising:
and controlling the heating device to be continuously opened or closed according to the pressure of the exhaust side of the compressor, a first preset pressure threshold value and a preset pressure difference threshold value.
6. The method according to claim 2, wherein said controlling the on-off state of the heating device according to the discharge side pressure of the compressor and a second preset pressure threshold comprises:
controlling the heating device to be started under the condition that the pressure on the exhaust side of the compressor is less than or equal to a second preset pressure threshold value; alternatively, the first and second electrodes may be,
and controlling the heating device to be closed under the condition that the pressure on the exhaust side of the compressor is greater than a second preset pressure threshold value.
7. The method of claim 6, wherein after the controlling the heating device to turn on, further comprising:
and controlling the heating device to be continuously opened or closed according to the pressure of the exhaust side of the compressor, a second preset pressure threshold value and a preset pressure difference threshold value.
8. An apparatus for controlling a refrigeration chiller unit comprising a processor and a memory storing program instructions, wherein the processor is configured, on execution of the program instructions, to perform a method for controlling a refrigeration chiller unit as claimed in any one of claims 1 to 7.
9. A refrigeration and freezing assembly, comprising:
means for controlling a refrigeration and freezing assembly as claimed in claim 8;
and the heating device is arranged on the high-pressure liquid storage device of the compressor exhaust passage and is controlled by the processor to be opened to heat the high-pressure liquid storage device or closed to stop heating.
10. A storage medium storing program instructions, characterized in that the program instructions, when executed, perform a method for controlling a refrigeration and freezing assembly according to any one of claims 1 to 7.
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| CN202210017391.2A CN114353361A (en) | 2022-01-07 | 2022-01-07 | Method and device for controlling refrigeration and freezing unit and refrigeration and freezing unit |
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