CN117469867A - Air conditioning unit, control method and device for air conditioning unit and computer readable storage medium - Google Patents

Abstract

The application relates to the technical field of refrigerating systems, and discloses an air conditioning unit, which comprises: the refrigeration system comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are connected through a refrigeration cycle pipeline; the gas-liquid separator is arranged in series between the air suction end of the compressor and the outlet of the evaporator; the electronic expansion valve is configured to controllably adjust an opening degree according to a liquid level value of the gas-liquid separator and a suction pressure of the compressor to adjust a speed of discharging the refrigerant from a suction side to a discharge side of the compressor. The liquid level value of the gas-liquid separator is used for determining the liquid refrigerant quantity in the gas-liquid separator, and the opening of the electronic expansion valve is regulated under the condition that the liquid level exceeds a liquid level threshold value, so that the refrigerant at the suction side of the compressor is discharged to the discharge side, and the suction of the compressor is prevented from carrying liquid when the gas-liquid separator is started next time. The application also discloses a control method and device for the air conditioning unit and a computer readable storage medium.

Description

Air conditioning unit, control method and device for air conditioning unit and computer readable storage medium

Technical Field

The present application relates to the technical field of refrigeration systems, and for example, to an air conditioning unit, a control method and device for the air conditioning unit, and a computer readable storage medium.

Background

The compressor liquid impact refers to the phenomenon that the compressor liquid is compressed due to the fact that a large amount of liquid is carried by an air suction pipe in the operation process of an air conditioning system, compressor oil can be taken away in a large amount when the liquid impact is light, the compressor bearing is worn, the service life of the compressor is shortened, the phenomenon that a cylinder is blocked and the like can occur when the liquid impact is serious, and even the compressor is directly damaged. At present, when a direct expansion system is operated, startup air suction liquid is often carried, liquid impact of a compressor occurs, and the problem of system oil leakage is caused.

In order to prevent the phenomenon of liquid entrainment during startup, a gas-liquid separator is additionally arranged at the gas suction end of the compressor in the related art, and the non-evaporated refrigerant is stored in the gas-liquid separator when the unit is stopped.

Although the related technology can avoid the occurrence of the phenomenon of liquid entrainment during air suction to a certain extent, the solution has high requirement on the volume of the gas-liquid separator, and the volume of the gas-liquid separator must meet the requirement that the refrigerant filling amount of the system is more than 80 percent, so that the liquid refrigerant can not directly enter the compressor when the unit is stopped. If too much refrigerant is filled, the suction liquid carrying problem still occurs.

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

Disclosure of Invention

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

Embodiments of the present disclosure provide an air conditioning unit, a control method and apparatus for an air conditioning unit, and a computer readable storage medium, so as to reduce the possibility of occurrence of suction liquid.

In some embodiments, the air conditioning unit includes: the refrigeration system comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are connected through a refrigeration cycle pipeline; the gas-liquid separator is arranged in series between the air suction end of the compressor and the outlet of the evaporator; the electronic expansion valve is configured to controllably adjust an opening degree according to a liquid level value of the gas-liquid separator and a suction pressure of the compressor to adjust a speed of discharging the refrigerant from a suction side to a discharge side of the compressor.

Optionally, the air conditioning unit further includes:

the refrigerant branch is arranged between the liquid refrigerant outlet of the gas-liquid separator and the inlet side of the evaporator and is configured to be controllably conducted to extract the liquid refrigerant in the gas-liquid separator and supply the liquid refrigerant to the high-pressure side of the refrigeration system.

Optionally, the outlet end of the refrigerant branch is arranged on a pipeline between the electronic expansion valve and the evaporator inlet; or, the outlet end of the refrigerant branch is arranged on a pipeline between the electronic expansion valve and the condenser outlet.

In some embodiments, the control method for an air conditioning unit includes: responding to the control instruction, and acquiring a liquid level value of the gas-liquid separator; acquiring the suction pressure of the compressor under the condition that the liquid level value of the gas-liquid separator is higher than the liquid level threshold value; and adjusting the opening degree of the electronic expansion valve according to the suction pressure of the compressor so as to adjust the speed of discharging the refrigerant from the suction side to the discharge side of the compressor.

Optionally, the adjusting the opening of the electronic expansion valve according to the suction pressure of the compressor includes:

controlling the opening degree of the electronic expansion valve to reduce a first regulating value under the condition that the suction pressure of the compressor is larger than a suction threshold value;

controlling the opening degree of the electronic expansion valve to reduce a second regulating value under the condition that the suction pressure of the compressor is smaller than or equal to a suction threshold value;

the first adjustment value is less than the second adjustment value.

Optionally, the air conditioning unit further comprises a refrigerant branch, and the refrigerant branch is arranged between a liquid refrigerant outlet of the gas-liquid separator and an inlet side of the evaporator; in the case that the liquid level value of the gas-liquid separator is higher than the liquid level threshold value, the control method for the air conditioning unit further comprises: and the refrigerant branch is conducted to extract the liquid refrigerant in the gas-liquid separator and supply the liquid refrigerant to the high-pressure side of the refrigeration system.

Optionally, the outlet end of the refrigerant branch is arranged on a pipeline between the electronic expansion valve and the evaporator inlet; the control method for the air conditioning unit further comprises the following steps: and when the control instruction is a stop instruction, controlling the fan of the evaporator to be started before the refrigerant branch is conducted.

In some embodiments, the control device for an air conditioning unit includes: the liquid level detection module is configured to respond to the control instruction and acquire a liquid level value of the gas-liquid separator; the pressure detection module is configured to acquire the suction pressure of the compressor under the condition that the liquid level value of the gas-liquid separator is higher than the liquid level threshold value; and the opening adjusting module is respectively configured to adjust the opening of the electronic expansion valve according to the suction pressure of the compressor so as to adjust the speed of discharging the refrigerant from the suction side to the discharge side of the compressor.

In some embodiments, the control device for an air conditioning unit includes a processor and a memory storing program instructions, where the processor is configured to execute the control method for an air conditioning unit described above when the program instructions are executed.

In some embodiments, the computer readable storage medium stores program instructions that, when executed, are configured to cause a computer to perform a control method for an air conditioning unit as described above.

The air conditioning unit, the control method and device for the air conditioning unit and the computer readable storage medium provided by the embodiment of the disclosure can realize the following technical effects:

the liquid level value of the gas-liquid separator is used for determining the liquid refrigerant quantity in the gas-liquid separator, and the opening of the electronic expansion valve is regulated under the condition that the liquid level exceeds a liquid level threshold value, so that the refrigerant at the suction side of the compressor is discharged to the discharge side, and the suction of the compressor is prevented from carrying liquid when the gas-liquid separator is started next time. And further, according to the suction pressure of the compressor, the speed of the refrigerant discharged from the suction side to the discharge side of the compressor is regulated, so that the refrigerant flow in the system can be dynamically regulated, and the problem of liquid entrainment of the compressor caused by liquid refrigerant in the gas-liquid separator 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 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 structural diagram of an air conditioning unit according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a control method for an air conditioning unit according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of another control method for an air conditioning unit provided by an embodiment of the present disclosure;

fig. 4 is a schematic structural view of another air conditioning unit according to an embodiment of the present disclosure;

fig. 5 is a schematic structural view of another air conditioning unit according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of another control method for an air conditioning unit provided by an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of another control method for an air conditioning unit provided by an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of another control device for an air conditioning unit provided by an embodiment of the present disclosure;

fig. 9 is a schematic view of another control device for an air conditioning unit 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.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

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.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

Fig. 1 is a schematic structural diagram of an air conditioning unit according to an embodiment of the present disclosure.

As shown in connection with fig. 1, an air conditioning unit according to an embodiment of the present disclosure includes a refrigeration system and a gas-liquid separator 11. The refrigeration system comprises a compressor 12, a condenser 13, an electronic expansion valve 14 and an evaporator 15 which are sequentially communicated through a refrigeration cycle pipeline. The gas-liquid separator 11 is arranged in series between the suction end of the compressor 12 and the outlet of the evaporator 15; the electronic expansion valve 14 is configured to controllably adjust an opening degree according to a liquid level value of the gas-liquid separator 11 and a suction pressure of the compressor 12 to adjust a discharge rate of the refrigerant from a suction side to a discharge side of the compressor 12.

In the embodiment of the disclosure, the refrigerant circulates in the refrigeration cycle. The compressor 12, the condenser, the electronic expansion valve 14, the evaporator 15, and the gas-liquid separator 11 are sequentially connected in series through a refrigeration cycle line. After flowing out from the compressor 12, the refrigerant flows through the condenser, enters the evaporator 15 through the electronic expansion valve 14, enters the gas-liquid separator 11 after heat exchange, and the air suction pipe of the gas-liquid separator 11 is connected with the air suction end of the compressor 12.

Further, a liquid level meter is arranged on the gas-liquid separator 11 to detect the liquid level value of the refrigerant in the gas-liquid separator 11, thereby obtaining the liquid refrigerant amount therein.

Further, a pressure sensor is provided on the suction pipe of the gas-liquid separator 11, or on a connection line between the suction pipe of the gas-liquid separator 11 and the suction end of the compressor 12, or on the suction end of the compressor 12, for detecting the suction pressure of the compressor 12.

In this way, the liquid level value of the gas-liquid separator 11 determines the amount of liquid refrigerant therein, and when the liquid level exceeds the liquid level threshold value, the opening degree of the electronic expansion valve 14 is adjusted to discharge the refrigerant on the suction side of the compressor 12 to the discharge side, thereby preventing the compressor 12 from sucking liquid when starting next time. And further, according to the suction pressure of the compressor 12, the speed of the refrigerant discharged from the suction side to the discharge side of the compressor 12 is regulated, so that the flow rate of the refrigerant in the system can be dynamically regulated, and the suction liquid carrying problem caused by the liquid refrigerant in the gas-liquid separator 11 is avoided.

Fig. 2 is a control method for an air conditioning unit according to an embodiment of the present disclosure, for controlling the air conditioning unit shown in fig. 1. The control method for the air conditioning unit may be performed by the air conditioning unit; may also be implemented in a server, such as a cloud server in communication with an air conditioning unit; but also at the terminal device, such as a control terminal. In the embodiment of the present disclosure, a description will be given of a mode in which a control module of an air conditioning unit is used as an execution body.

As shown in fig. 2, the control method for an air conditioning unit includes:

step S201, in response to the control command, obtains a liquid level value of the gas-liquid separator.

Step S202, acquiring the suction pressure of the compressor when the liquid level value of the gas-liquid separator is higher than the liquid level threshold value.

In step S203, the opening degree of the electronic expansion valve is adjusted according to the suction pressure of the compressor, so as to adjust the speed of discharging the refrigerant from the suction side to the discharge side of the compressor.

The liquid level threshold is a liquid level early warning value, and when the liquid level of the refrigerant in the gas-liquid separator reaches the liquid level early warning value, liquid impact of the suction liquid is easily caused.

Thus, when a control instruction is received, the liquid level value of the gas-liquid separator is obtained, and whether the requirement for adjusting the opening of the electronic expansion valve is met or not is further determined. Under the condition that the liquid level value of the gas-liquid separator is higher than the liquid level threshold value, the opening of the electronic expansion valve is adjusted according to the suction pressure, the refrigerant on the suction side of the compressor is discharged to the exhaust side, and the suction of the compressor is prevented from carrying liquid when the compressor is restarted after shutdown, so that the normal operation is influenced.

Optionally, adjusting the opening of the electronic expansion valve according to the suction pressure of the compressor includes:

determining an electronic expansion valve opening regulating value corresponding to the current air suction pressure of the compressor according to the negative correlation between the air suction pressure of the compressor and the electronic expansion valve opening regulating value;

and reducing the opening regulating value of the electronic expansion valve on the basis of the current opening of the electronic expansion valve.

Further, determining an electronic expansion valve opening adjustment value corresponding to the current compressor suction pressure according to a negative correlation between the compressor suction pressure and the electronic expansion valve opening adjustment value, comprising:

determining a current pressure interval in which the current suction pressure of the compressor is located in a plurality of preset pressure intervals;

if the current pressure interval is the first pressure interval, taking the first regulating value as an electronic expansion valve opening regulating value;

if the current pressure interval is the second pressure interval, taking the second regulating value as an electronic expansion valve opening regulating value;

the first pressure interval and the second pressure interval are any two of a plurality of preset pressure intervals, any pressure value of the first pressure interval is larger than any pressure value of the second pressure interval, and the first regulating value is smaller than the second regulating value.

In this way, whether to perform the preventive control stage or not can be determined based on the suction pressure, and the unit can be protected.

Fig. 3 is a control method for an air conditioning unit according to an embodiment of the present disclosure, for controlling the air conditioning unit shown in fig. 1. In the embodiment of the present disclosure, a description will be given of a mode in which a control module of an air conditioning unit is used as an execution body.

As shown in fig. 3, the control method for an air conditioning unit includes:

step S301, in response to the shutdown command, obtains a liquid level value of the gas-liquid separator. Here, the control command is a stop command, so as to determine whether the next start-up has a risk of liquid carrying during suction of the compressor before stopping.

In step S302, in the case that the liquid level value of the gas-liquid separator is higher than the liquid level threshold value, the compressor suction pressure is obtained.

In step S303, when the suction pressure of the compressor is greater than the suction threshold value, the electronic expansion valve opening is controlled to decrease by the first adjustment value.

Step S304, controlling the opening degree of the electronic expansion valve to reduce a second regulating value under the condition that the suction pressure of the compressor is smaller than or equal to a suction threshold value; the first adjustment value is less than the second adjustment value.

Here, if the suction pressure is high, the valve opening of the electronic expansion valve is reduced slightly, so that the evaporation side refrigerant is slowly discharged to the condensation side; if the suction pressure is low, the refrigerant needs to be sucked to the discharge side quickly, and the valve opening of the electronic expansion valve is reduced to a larger extent.

In this way, the liquid level value of the gas-liquid separator is used for determining the liquid refrigerant quantity in the gas-liquid separator, and the opening of the electronic expansion valve is regulated under the condition that the liquid level exceeds the liquid level threshold value, so that the refrigerant on the suction side of the compressor is discharged to the discharge side, and the suction of the compressor is prevented from carrying liquid when the gas-liquid separator is started next time. And further, according to the suction pressure of the compressor, the speed of the refrigerant discharged from the suction side to the discharge side of the compressor is regulated, so that the flow of the refrigerant in the system can be dynamically regulated, and the suction liquid carrying problem caused by the liquid refrigerant in the gas-liquid separator is avoided.

Fig. 4 to 5 are schematic structural views of another air conditioning unit according to an embodiment of the present disclosure.

As shown in fig. 4 to 5, an air conditioning unit according to an embodiment of the present disclosure includes a refrigeration system, a gas-liquid separator 11, and a refrigerant branch 20. The refrigeration system comprises a compressor 12, a condenser 13, an electronic expansion valve 14 and an evaporator 15 which are sequentially communicated through a refrigeration cycle pipeline. The gas-liquid separator 11 is arranged in series between the suction end of the compressor 12 and the outlet of the evaporator 15; the electronic expansion valve 14 is configured to controllably adjust an opening degree according to a liquid level value of the gas-liquid separator 11 and a suction pressure of the compressor 12 to adjust a discharge rate of the refrigerant from a suction side to a discharge side of the compressor 12. The refrigerant branch 20 is disposed between the liquid refrigerant outlet of the gas-liquid separator 11 and the inlet side of the evaporator 15, and is configured to be controllably conducted to extract the liquid refrigerant in the gas-liquid separator 11 to be supplied to the high pressure side of the refrigeration system.

Optionally, a refrigerant pump 21 is further disposed on the refrigerant branch 20. The refrigerant branch 20 is turned on and off by the opening and closing of the refrigerant pump 21, so as to realize the extraction and stop of the liquid refrigerant in the gas-liquid separator 11.

Further, the refrigerant bypass 20 is further provided with a check valve 22 disposed between the outlet of the refrigerant pump 21 and the inlet side of the evaporator 15. Thereby avoiding the reverse flow of the refrigerant under the pressure.

Here, the inlet side of the evaporator 15 means a connection line between the inlet of the evaporator 15 and the outlet of the condenser.

Optionally, the outlet end of the refrigerant branch 20 is disposed on a pipeline between the electronic expansion valve 14 and the inlet of the evaporator 15; or alternatively, the first and second heat exchangers may be,

the outlet end of the refrigerant branch 20 is arranged on a pipeline between the electronic expansion valve 14 and the outlet of the condenser 13.

Fig. 4 is a schematic structural diagram of another air conditioning unit according to an embodiment of the present disclosure, where an outlet end of the refrigerant branch 20 is disposed on a pipeline between the electronic expansion valve 14 and an inlet of the evaporator 15.

After the liquid refrigerant in the gas-liquid separator 11 is extracted through the refrigerant branch 20, the refrigerant can be led into the high-pressure side of the refrigerating system, the low-pressure low-temperature refrigerant is mixed with the high-pressure high-temperature refrigerant, and then the refrigerant can be evaporated for heat exchange, so that the possibility of sucking and carrying liquid phenomenon is reduced when the machine is started next time.

Fig. 5 is a schematic structural diagram of another air conditioning unit according to an embodiment of the present disclosure, where an outlet end of the refrigerant branch 20 is disposed on a pipeline between the electronic expansion valve 14 and an outlet of the condenser 13.

At this time, the liquid refrigerant in the gas-liquid separator 11 extracted by the refrigerant branch 20 is sent to the evaporator 15, and continues to participate in refrigeration; meanwhile, in order to avoid the situation of air suction and liquid carrying during the next startup, the fan of the evaporator 15 needs to be turned on to enable the liquid refrigerant to exchange heat with the external air of the fins to be changed into a gaseous refrigerant, so that the situation of air suction and liquid carrying during the next startup is avoided.

In this way, the liquid level value of the gas-liquid separator 11 determines the amount of liquid refrigerant therein, and when the liquid level exceeds the liquid level threshold value, the opening degree of the electronic expansion valve 14 is adjusted to discharge the refrigerant on the suction side of the compressor 12 to the discharge side, thereby preventing the compressor 12 from sucking liquid when starting next time. Further, according to the suction pressure of the compressor 12, the speed of the refrigerant discharged from the suction side to the discharge side of the compressor 12 is regulated, so that the flow rate of the refrigerant in the system can be dynamically regulated; meanwhile, the refrigerant branch 20 is controllably conducted to extract the liquid refrigerant in the gas-liquid separator 11 to be supplied to the high-pressure side of the refrigerating system, so that the adjustment of redundant refrigerant in the gas-liquid separator 11 is further realized, and the problem of liquid suction caused by the liquid refrigerant in the gas-liquid separator 11 is avoided.

Fig. 6 is a control method for an air conditioning unit according to an embodiment of the present disclosure, for controlling the air conditioning unit shown in fig. 4. In the embodiment of the present disclosure, a description will be given of a mode in which a control module of an air conditioning unit is used as an execution body.

As shown in fig. 6, the control method for an air conditioning unit includes:

in step S601, a liquid level value of the gas-liquid separator is obtained in response to the control command. In this embodiment, the control instruction may be a shutdown instruction.

In step S602, when the liquid level value of the gas-liquid separator is higher than the liquid level threshold, the refrigerant branch is turned on to extract the liquid refrigerant in the gas-liquid separator and supply the liquid refrigerant to the high pressure side of the refrigeration system.

Step S603, obtaining the compressor suction pressure.

In step S604, the opening degree of the electronic expansion valve is adjusted according to the suction pressure of the compressor, so as to adjust the speed of discharging the refrigerant from the suction side to the discharge side of the compressor.

Therefore, after the control instruction is acquired, the liquid level state of the gas-liquid separator is detected, if the liquid level exceeds a liquid level threshold value, the refrigerant branch is controllably conducted to extract liquid refrigerant in the gas-liquid separator, and redundant refrigerant is pumped into the high-pressure side of the system through the refrigerant pump, so that the phenomenon of liquid entrainment during air suction of the compressor is avoided.

Fig. 7 is a control method for an air conditioning unit according to an embodiment of the present disclosure, for controlling the air conditioning unit shown in fig. 5. In the embodiment of the present disclosure, a description will be given of a mode in which a control module of an air conditioning unit is used as an execution body.

As shown in fig. 7, the control method for an air conditioning unit includes:

in step S701, in response to the control instruction, a control intention corresponding to the control instruction is determined.

Step S702, a liquid level value of the gas-liquid separator is obtained.

In step S703, if the control is intended to be a stop command and the liquid level of the gas-liquid separator is higher than the set threshold, the fan of the evaporator is controlled to be turned on. Therefore, before the redundant refrigerant in the gas-liquid separator reaches the liquid separating tank, the temperature of the environment is reduced, so that the liquid refrigerant is changed into a gaseous refrigerant through heat exchange with the external wind of the fins.

Step S704, a refrigerant branch is conducted to extract liquid refrigerant in the gas-liquid separator and send the liquid refrigerant to the liquid separating tank to enter the evaporator.

Step S705, obtaining the compressor suction pressure.

Step S706, the opening degree of the electronic expansion valve is adjusted according to the suction pressure of the compressor, so as to adjust the speed of discharging the refrigerant from the suction side to the discharge side of the compressor. And returns to step S702 to continue detecting the liquid level value of the gas-liquid separator.

Step S707, if the control intention is a shutdown instruction and the liquid level of the gas-liquid separator is lower than or equal to the set threshold, the air conditioning unit executes the control instruction to enter a shutdown program, controls the refrigerant branch to be cut off, and controls the fan of the evaporator to be turned off in a delayed manner. Optionally, the fan of the evaporator is controlled to be turned off for 5 minutes in the embodiment.

Step 708, if the control is not a shutdown command and the gas-liquid separator liquid level is higher than the set threshold, the refrigerant branch is turned on to extract the liquid refrigerant in the gas-liquid separator to the liquid separation tank to enter the evaporator. And the redundant refrigerant is continuously involved in refrigeration before reaching the liquid separating tank of the evaporator through the refrigerant pump. And returns to step S702 to continue detecting the liquid level value of the gas-liquid separator.

In step S709, if the control intention is a non-shutdown command and the gas-liquid separator liquid level is lower than or equal to the set threshold, the refrigerant bypass is controlled to be cut off.

Thus, after the control instruction is acquired, corresponding control setting is performed according to the control intention. By detecting the liquid level state of the gas-liquid separator, under the condition that the liquid level exceeds a liquid level threshold value, the refrigerant branch is controllably conducted to extract liquid refrigerant in the gas-liquid separator, so that redundant refrigerant is pumped into a high-pressure side of a system through a refrigerant pump, and the phenomenon of liquid entrainment during air suction of the compressor is avoided. And under the condition that the control intention is a shutdown instruction, the liquid refrigerant can perform evaporation heat exchange or exchange with external air by controlling the evaporator fan, so that the phenomenon of liquid entrainment during the next startup is avoided.

Referring to fig. 8, an embodiment of the present disclosure provides a control device 80 for an air conditioning unit, which is applied to the air conditioning unit shown in any one of fig. 1, 4, and 5, and includes a liquid level detection module 81, a pressure detection module 82, and an opening adjustment module 83.

The liquid level detection module 81 is configured to obtain a liquid level value of the gas-liquid separator in response to a control instruction;

the pressure detection module 82 is configured to obtain a compressor suction pressure if a liquid level value of the gas-liquid separator is above a liquid level threshold;

the opening degree adjustment module 83 is configured to adjust the opening degree of the electronic expansion valve according to the suction pressure of the compressor to adjust the speed at which the refrigerant is discharged from the suction side to the discharge side of the compressor.

As shown in connection with fig. 9, an embodiment of the present disclosure provides a control apparatus 90 for an air conditioning unit, including a processor (processor) 900 and a memory (memory) 901. Optionally, the apparatus 90 may also include a communication interface (Communication Interface) 902 and a bus 903. The processor 900, the communication interface 902, and the memory 901 may communicate with each other via the bus 903. The communication interface 902 may be used for information transfer. The processor 900 may call logic instructions in the memory 901 to perform the control method for an air conditioning unit of the above-described embodiment.

Further, the logic instructions in the memory 901 may be implemented in the form of a software functional unit and may be stored in a computer readable storage medium when sold or used as a separate product.

The memory 901 is a computer readable storage medium, and may be used to store a software program, a computer executable program, and program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 900 executes the function application and the data processing by executing the program instructions/modules stored in the memory 901, that is, implements the control method for the air conditioning unit in the above-described embodiment.

The memory 901 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 functions; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 901 may include a high-speed random access memory, and may also include a nonvolatile memory.

Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-described control method for an air conditioning unit.

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. While the aforementioned storage medium may be a non-transitory storage medium, 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 the like, which can store program codes.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. 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 comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.

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

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

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

Claims (10)

1. An air conditioning unit, comprising:

the refrigeration system comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are connected through a refrigeration cycle pipeline;

the gas-liquid separator is arranged in series between the air suction end of the compressor and the outlet of the evaporator;

the electronic expansion valve is configured to controllably adjust an opening degree according to a liquid level value of the gas-liquid separator and a suction pressure of the compressor to adjust a speed of discharging the refrigerant from a suction side to a discharge side of the compressor.

2. The air conditioning assembly of claim 1, further comprising:

the refrigerant branch is arranged between the liquid refrigerant outlet of the gas-liquid separator and the inlet side of the evaporator and is configured to be controllably conducted to extract the liquid refrigerant in the gas-liquid separator and supply the liquid refrigerant to the high-pressure side of the refrigeration system.

3. The air conditioning unit according to claim 2, wherein the outlet end of the refrigerant branch is disposed on a pipeline between the electronic expansion valve and the evaporator inlet; or alternatively, the first and second heat exchangers may be,

the outlet end of the refrigerant branch is arranged on a pipeline between the electronic expansion valve and the condenser outlet.

4. The control method for the air conditioning unit is characterized in that the air conditioning unit comprises a refrigerating system and a gas-liquid separator, wherein the refrigerating system comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are connected through a refrigerating circulation pipeline; the gas-liquid separator is arranged in series between the suction end of the compressor and the outlet of the evaporator; the control method comprises the following steps:

responding to the control instruction, and acquiring a liquid level value of the gas-liquid separator;

acquiring the suction pressure of the compressor under the condition that the liquid level value of the gas-liquid separator is higher than the liquid level threshold value;

and adjusting the opening degree of the electronic expansion valve according to the suction pressure of the compressor so as to adjust the speed of discharging the refrigerant from the suction side to the discharge side of the compressor.

5. The control method according to claim 4, wherein the adjusting the opening degree of the electronic expansion valve according to the suction pressure of the compressor includes:

controlling the opening degree of the electronic expansion valve to reduce a first regulating value under the condition that the suction pressure of the compressor is larger than a suction threshold value;

controlling the opening degree of the electronic expansion valve to reduce a second regulating value under the condition that the suction pressure of the compressor is smaller than or equal to a suction threshold value;

the first adjustment value is less than the second adjustment value.

6. The control method according to claim 4, wherein the air conditioning unit further comprises a refrigerant branch line provided between a liquid refrigerant outlet of the gas-liquid separator and an inlet side of the evaporator;

in the case that the liquid level value of the gas-liquid separator is higher than the liquid level threshold value, the control method further includes:

and the refrigerant branch is conducted to extract the liquid refrigerant in the gas-liquid separator and supply the liquid refrigerant to the high-pressure side of the refrigeration system.

7. The control method according to claim 4, wherein the air conditioning unit further comprises a refrigerant branch, and an outlet end of the refrigerant branch is disposed on a pipeline between the electronic expansion valve and the evaporator inlet; the control method further includes:

and when the control instruction is a stop instruction, controlling the fan of the evaporator to be started before the refrigerant branch is conducted.

8. A control device for an air conditioning unit, characterized in that the air conditioning unit comprises a refrigeration system and a gas-liquid separator, wherein the refrigeration system comprises a compressor, a condenser, an electronic expansion valve and an evaporator which are connected through a refrigeration cycle pipeline; the gas-liquid separator is arranged in series between the suction end of the compressor and the outlet of the evaporator; the control device includes:

the liquid level detection module is configured to respond to the control instruction and acquire a liquid level value of the gas-liquid separator;

the pressure detection module is configured to acquire the suction pressure of the compressor under the condition that the liquid level value of the gas-liquid separator is higher than the liquid level threshold value;

and the opening adjusting module is configured to adjust the opening of the electronic expansion valve according to the suction pressure of the compressor so as to adjust the speed of discharging the refrigerant from the suction side to the discharge side of the compressor.

9. A control apparatus for an air conditioning unit comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the control method for an air conditioning unit according to any of claims 3 to 7 when running the program instructions.

10. A computer-readable storage medium storing program instructions that, when executed, cause a computer to perform the control method for an air conditioning unit according to any one of claims 3 to 7.