CN114322205B - Air conditioner and defrosting method thereof, control device and readable storage medium - Google Patents
Air conditioner and defrosting method thereof, control device and readable storage medium Download PDFInfo
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- CN114322205B CN114322205B CN202011066261.5A CN202011066261A CN114322205B CN 114322205 B CN114322205 B CN 114322205B CN 202011066261 A CN202011066261 A CN 202011066261A CN 114322205 B CN114322205 B CN 114322205B
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Abstract
The invention discloses a defrosting method of an air conditioner, which is based on the air conditioner that a compressor exhaust port and a compression cavity with lower pressure are communicated through a bypass pipeline, wherein a throttling device is arranged in the bypass pipeline, and the method comprises the following steps: when the air conditioner meets the set defrosting condition, controlling the air conditioner to enter a defrosting operation stage; and after the air conditioner enters the defrosting operation stage, controlling the throttle device to be opened so that a part of refrigerant discharged by the compressor enters a compression cavity through the throttle device. The invention also discloses an air conditioner control device, an air conditioner and a computer readable storage medium. The invention aims to improve the defrosting efficiency of an air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting method of an air conditioner, an air conditioner control device, the air conditioner and a computer readable storage medium.
Background
With the development of science and technology, the living standard of people is improved, the air conditioner is widely applied, the use requirement of people on the air conditioner is higher and higher, and the performance of the air conditioner is continuously optimized. Most of the existing air conditioners can also heat except refrigeration, and heat is transferred to the indoor through the heating of the air conditioners in winter. When the air conditioner heats in a low-temperature environment, the outdoor unit is easy to frost, and the air conditioner needs to be defrosted to ensure the indoor heating effect
However, when the air conditioner is operated in a defrosting mode at present, the power of the compressor is difficult to rapidly increase in a low-temperature environment, and defrosting efficiency is low.
Disclosure of Invention
The invention mainly aims to provide a defrosting method of an air conditioner, aiming at improving the defrosting efficiency of the air conditioner.
In order to achieve the above object, the present invention provides a defrosting method for an air conditioner, the air conditioner includes a compressor and a bypass pipeline, the compressor includes a compression cavity, the compressor is provided with an exhaust port, the pressure in the compression cavity is less than or equal to a set threshold, the bypass pipeline communicates the exhaust port with the compression cavity, the bypass pipeline is provided with a throttling device, the defrosting method for the air conditioner includes the following steps:
when the air conditioner meets the set defrosting condition, controlling the air conditioner to enter a defrosting operation stage;
and after the air conditioner enters the defrosting operation stage, controlling the throttle device to be opened so that a part of refrigerant discharged by the compressor flows through the throttle device and enters a compression cavity.
Optionally, after the air conditioner enters the defrosting operation stage, the step of controlling the throttle device to be opened includes:
when the air conditioner enters the defrosting operation stage, acquiring the outdoor environment temperature and the current first exhaust temperature of the compressor;
acquiring a target exhaust temperature corresponding to the compressor according to the outdoor environment temperature;
and if the first exhaust temperature is less than or equal to the target exhaust temperature, executing the step of controlling the throttle device to be opened.
Optionally, the set defrosting condition includes a defrosting trigger temperature corresponding to an outdoor environment, and the step of obtaining the target exhaust temperature corresponding to the compressor according to the outdoor environment temperature includes:
determining a temperature deviation between the outdoor environment temperature and the defrosting triggering temperature;
determining the target exhaust temperature according to the temperature deviation;
wherein the target exhaust temperature is in a decreasing trend as the temperature deviation increases.
Optionally, after the step of controlling the throttle device to open, the method further includes:
acquiring a power characteristic parameter of a compressor;
and if the power characteristic parameter is less than or equal to the set power parameter, controlling the throttling device to increase the opening degree.
Optionally, the step of controlling the throttle device to increase the opening degree comprises:
acquiring the temperature change parameter of the coil pipe of the outdoor heat exchanger after the throttling device is started;
determining the adjustment parameters of the throttling device according to the variation parameters;
and controlling the throttle device to increase the opening according to the adjusting parameter.
Optionally, the step of obtaining a variation parameter of the temperature of the coil of the outdoor heat exchanger after the throttling device is turned on includes:
acquiring the variation amplitude of the temperature of the coil pipe of the outdoor heat exchanger within a set time after the throttling device is started as the variation parameter;
the step of determining an adjustment parameter of the throttling device according to the variation parameter comprises:
determining the opening degree adjustment amplitude of the throttling device according to the change amplitude; the opening degree adjustment amplitude is in a decreasing trend along with the increase of the change amplitude;
and taking the opening degree adjusting amplitude as the adjusting parameter.
Optionally, after the step of controlling the opening of the throttling device, the method further includes:
acquiring the current coil temperature of an outdoor heat exchanger and the target temperature of the coil of the outdoor heat exchanger under the condition that the air conditioner exits defrosting;
determining a temperature difference between the coil temperature and the target temperature;
and if the temperature difference is smaller than or equal to the set temperature difference, controlling the throttling device to reduce the opening or close.
Optionally, after the step of controlling the opening of the throttling device, the method further includes:
and controlling an electronic expansion valve to increase the opening degree, wherein the electronic expansion valve is a throttling device arranged between the indoor heat exchanger and the outdoor heat exchanger.
Optionally, the step of controlling the electronic expansion valve to increase the opening degree comprises:
acquiring a first change characteristic parameter corresponding to the exhaust temperature of a compressor, a second change characteristic parameter corresponding to the current of the compressor and/or a third change characteristic parameter corresponding to the temperature of an indoor heat exchanger;
determining the adjustment amplitude of the electronic expansion valve according to the first variation characteristic parameter, the second variation characteristic parameter and/or the third variation characteristic parameter;
and controlling the electronic expansion valve to increase the opening according to the adjustment amplitude.
Optionally, the step of determining the adjustment amplitude of the electronic expansion valve according to the first variation characteristic parameter, the second variation characteristic parameter and/or the third variation characteristic parameter includes:
acquiring a first setting weight corresponding to the first variation characteristic parameter, a second setting weight corresponding to the second variation characteristic parameter and a third setting weight corresponding to the third variation characteristic parameter;
carrying out weighted average on the first change characteristic parameter, the second change characteristic parameter and the third change characteristic parameter according to the first set weight, the second set weight and the third set weight to obtain a target change characteristic parameter;
determining the adjustment amplitude of the electronic expansion valve according to the target change characteristic parameter, wherein the adjustment amplitude is in an increasing trend along with the increase of the target change characteristic parameter;
the first setting weight is larger than the third setting weight, and the second setting weight is larger than the third setting weight.
Optionally, before controlling the electronic expansion valve to increase the opening degree, the method further includes:
acquiring the return air temperature of the compressor;
if the return air temperature is less than or equal to the minimum return air temperature corresponding to the reliable operation of the compressor, controlling the electronic expansion valve to reduce the opening degree;
and if the return air temperature is higher than the minimum return air temperature, executing the step of controlling the electronic expansion valve to increase the opening degree.
Further, in order to achieve the above object, the present application also proposes an air conditioning control device including: the defrosting method comprises a memory, a processor and an air conditioner control program stored on the memory and capable of running on the processor, wherein the air conditioner control program realizes the steps of the defrosting method of the air conditioner as described in any one of the above items when being executed by the processor.
Further, in order to achieve the above object, the present application also proposes an air conditioner including:
the compressor comprises a compression cavity, the compressor is provided with an exhaust port, and the pressure in the compression cavity is smaller than or equal to a set threshold value;
the bypass pipeline is communicated with the exhaust port and the compression cavity and is provided with a throttling device; and
the air conditioning control device as described above, which is connected to the throttle device.
Optionally, the air conditioner still includes vapour and liquid separator, the compressor still is equipped with the return air mouth, vapour and liquid separator's gaseous phase export passes through first tube coupling with the return air mouth, the compression chamber with the return air mouth intercommunication, bypass line intercommunication the gas vent with first pipeline.
Optionally, the compressor is further provided with an air return port and an air suction port, the compression cavity comprises a first compression cavity and a second compression cavity, the pressure in the second compression cavity is smaller than the pressure in the first compression cavity, the air suction port is communicated with the first compression cavity, the air return port is communicated with the second compression cavity, and the bypass pipeline is communicated with the exhaust port and the air suction port.
Optionally, the throttling means comprises an electronic expansion valve; or the throttling device comprises an electromagnetic valve and a capillary tube connected in series with the electromagnetic valve.
Further, in order to achieve the above object, the present application also proposes a computer readable storage medium having stored thereon an air conditioning control program which, when executed by a processor, implements the steps of the defrosting method of an air conditioner as set forth in any one of the above.
The invention provides a defrosting method of an air conditioner, which is applied to the air conditioner which is communicated with an exhaust port of a compressor and a compression cavity with lower pressure through a bypass pipeline, wherein a throttling device is arranged in the bypass pipeline, the air conditioner is controlled to enter a defrosting operation stage when the air conditioner meets a set defrosting condition, after the air conditioner enters the defrosting operation stage, the throttling device is controlled to be opened, so that a part of refrigerant discharged by the compressor flows through the throttling device and enters the compression cavity with lower pressure, the exhaust gas of the compressor is mixed with low-temperature gas sucked by the compression cavity and then is compressed, the exhaust temperature is further improved, the power of the compressor is rapidly increased in a short time in the starting stage, the temperature of the refrigerant entering an outdoor heat exchanger can be further increased, the frosting of an outdoor unit is rapidly melted, and the defrosting efficiency of the air conditioner is improved.
Drawings
FIG. 1 is a schematic diagram illustrating a refrigerant pipeline structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the refrigerant pipeline structure in another embodiment of the air conditioner of the present invention;
FIG. 3 is a schematic diagram illustrating the structural connection of refrigerant pipes in another embodiment of the air conditioner of the present invention;
FIG. 4 is a schematic diagram of a hardware configuration involved in the operation of an embodiment of the air conditioning control apparatus of the present invention;
FIG. 5 is a schematic flow chart illustrating a defrosting method of an air conditioner according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating a defrosting method of an air conditioner according to another embodiment of the present invention;
FIG. 7 is a schematic flow chart illustrating a defrosting method of an air conditioner according to another embodiment of the present invention;
fig. 8 is a schematic flow chart illustrating a defrosting method of an air conditioner according to still another embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: the air conditioner comprises a compressor and a bypass pipeline, wherein the compressor comprises a compression cavity of which the pressure in the cavity is less than or equal to a set threshold, and a throttling device is arranged on the bypass pipeline, so that the defrosting method of the air conditioner comprises the following steps: when the air conditioner meets the set defrosting condition, controlling the air conditioner to enter a defrosting operation stage; and after the air conditioner enters the defrosting operation stage, controlling the throttle device to be opened so that a part of refrigerant discharged by the compressor enters a compression cavity through the throttle device.
In the prior art, the power of the compressor is difficult to rapidly increase in a low-temperature environment during defrosting operation of the air conditioner, so that the defrosting efficiency is low.
The present invention provides the above solution, and aims at raising the defrosting efficiency of air conditioner.
The embodiment of the invention provides an air conditioner. The air conditioner can be any air conditioning equipment with a heat pump system, such as a wall-mounted air conditioner, a cabinet air conditioner, a window air conditioner and the like.
In the embodiment of the present invention, referring to fig. 1 to 3, the air conditioner includes a compressor 1, a first heat exchanger 2, an electronic expansion valve 3, and a second heat exchanger 4, wherein the compressor 1, the first heat exchanger 2, the electronic expansion valve 3, and the second heat exchanger 4 are sequentially connected through a pipeline to form a refrigerant circulation loop of the air conditioner. Wherein, the arrows in fig. 1 to 3 are the refrigerant flow direction
Wherein the compressor 1 is provided with an exhaust port and a return port. Specifically, an exhaust port of the compressor 1 is connected to a refrigerant inlet of the first heat exchanger 2, a refrigerant outlet of the first heat exchanger 2 is connected to a refrigerant inlet of the electronic expansion valve 3, a refrigerant outlet of the electronic expansion valve 3 is connected to a refrigerant inlet of the second heat exchanger 4, and a refrigerant outlet of the second heat exchanger 4 is connected to a return air port of the compressor 1.
The compressor 1 comprises at least two compression cavities, the pressure in one of the at least two compression cavities is less than or equal to a set threshold, and the pressure in the other of the at least two compression cavities is greater than the set threshold. Specifically, in the present embodiment, the compression cavities in the compressor 1 include a high pressure cavity, a middle pressure cavity and a low pressure cavity, wherein the high pressure cavity is communicated with the exhaust port, and the low pressure cavity is communicated with the return air port. The pressure in the high pressure chamber is greater than the pressure in the medium pressure chamber, which is greater than the pressure in the low pressure chamber. The compression chamber smaller than or equal to the set threshold in this embodiment may be a medium pressure chamber or a low pressure chamber.
Referring to fig. 1 to 3, the air conditioner further includes a bypass line 5, a throttling device 51 is disposed on the bypass line 5, and the bypass line 5 communicates an exhaust port and a compression chamber with a pressure less than or equal to a set threshold. Specifically, one end of the bypass line 5 is communicated with the exhaust port, and the other end of the bypass line 5 may be communicated with the medium-pressure chamber and/or the low-pressure chamber. When the throttle device 51 is opened, a part of the refrigerant flowing out of the exhaust port of the compressor 1 sequentially flows through the first heat exchanger 2, the electronic expansion valve 3 and the second heat exchanger 4 and then flows back to the compressor 1 from the return port, and the other part of the refrigerant flowing out of the exhaust port of the compressor 1 flows into the compressor 1 after throttling and pressure reduction through the throttle device 51 from the bypass pipeline 5. When the throttle 51 is closed, the refrigerant flowing out of the discharge port of the compressor 1 does not flow through the bypass line 5.
In an embodiment, referring to fig. 1 and 2, the compressor 1 is further provided with a suction port in addition to the exhaust port and the return port, the compression chambers include a first compression chamber and a second compression chamber, the pressure in the second compression chamber is smaller than the pressure in the first compression chamber, the suction port is communicated with the first compression chamber, the return port is communicated with the second compression chamber, and the bypass line 5 is communicated with the exhaust port and the suction port. The first compression chamber is specifically referred to as a medium pressure chamber, the second compression chamber is specifically referred to as a low pressure chamber, the medium pressure chamber is communicated with the suction port, and the low pressure chamber is communicated with the return port. Based on this, when the throttling device 51 is opened, part of the refrigerant discharged from the compressor 1 can enter the middle pressure cavity and further enter the compressor 1 after being mixed with the low-temperature refrigerant sucked from the low pressure cavity by the middle pressure cavity, so that the power of the compressor 1 can be rapidly increased in a short time when the throttling device 51 is opened.
In another embodiment, referring to fig. 3, the air conditioner further includes a gas-liquid separator 6, the gas-liquid separator 6 is disposed between the second heat exchanger 4 and the return air port, a gas phase outlet of the gas-liquid separator 6 is connected to the return air port through a first pipeline, the return air port is communicated with the low pressure cavity, and the bypass pipeline 5 is communicated with the exhaust port and the first pipeline. Based on this, when throttling arrangement 51 opened, compressor 1 discharged some refrigerant can enter the low pressure chamber with the refrigerant that the gaseous phase export came out after mixing, improve the degree of superheat of breathing in of compressor 1 to realize that compressor 1 power rises fast in the short time when throttling arrangement 51 opened.
Specifically, the throttling device 51 is a device capable of throttling and depressurizing the refrigerant. The throttling and depressurizing action of the throttling device 51 can be opened or closed according to actual requirements. Wherein, referring to fig. 1, the throttling device 51 may comprise an electronic expansion valve 510. Referring also to FIG. 2, throttle device 51 may also include a solenoid 511 and a capillary tube 512 in series with solenoid 511.
Further, the air conditioner may further include a temperature sensor 01. Temperature sensor 01 may be used to detect one or more of outdoor ambient temperature, exhaust temperature, heat exchanger coil temperature, etc.
Further, an embodiment of the present invention further provides an air conditioner control device, which is applied to control the air conditioner. The air conditioner control device can be arranged in the air conditioner or be arranged outside the air conditioner independently of the air conditioner.
In an embodiment of the present invention, referring to fig. 4, an air conditioning control apparatus includes: a processor 1001 (e.g., CPU), memory 1002, etc. The memory 1002 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 1002 may alternatively be a storage device separate from the processor 1001.
The throttle device 51, the temperature sensor 01, the compressor 1, the electronic expansion valve 3, and the like described above are all connected to the processor 1001. The memory 1002 is connected to the processor 1001.
Those skilled in the art will appreciate that the configuration of the device shown in fig. 4 does not constitute a limitation of the device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 4, an air conditioner control program may be included in the memory 1002, which is a kind of computer-readable storage medium. In the apparatus shown in fig. 4, the processor 1001 may be configured to call an air conditioner control program stored in the memory 1002 and perform operations of the steps related to the defrosting method of the air conditioner in the following embodiments.
The embodiment of the invention also provides a defrosting method of the air conditioner, which is applied to control the air conditioner.
Referring to fig. 5, an embodiment of a defrosting method of an air conditioner according to the present application is provided. In this embodiment, the defrosting method of the air conditioner includes:
step S10, when the air conditioner meets the set defrosting condition, controlling the air conditioner to enter a defrosting operation stage;
the set defrosting condition specifically refers to a parameter range required by the operating condition parameters of the air conditioner when the outdoor unit is frosted and the heat exchange effect of the air conditioner is negatively affected. The defrosting condition can be set according to actual requirements. For example, when the outdoor coil temperature is less than or equal to a first preset temperature for a first time period and the outdoor ambient temperature is less than or equal to a second preset temperature, it may be determined that the air conditioner satisfies the set defrosting condition.
The step of controlling the air conditioner to enter the defrosting operation stage is to control the outdoor heat exchanger of the air conditioner to enter a condensing state. Specifically, when the air conditioner is in heating operation, if the air conditioner meets the set defrosting condition, the compressor can be controlled to stop and the four-way valve is controlled to change direction, the compressor is started after the four-way valve is changed to the direction, the outdoor heat exchanger in the evaporation state is switched to the condensation state to release heat, and the air conditioner enters a defrosting operation stage at the moment.
And step S20, after the air conditioner enters the defrosting operation stage, controlling the throttle device to be opened so that a part of refrigerant discharged by the compressor enters a compression cavity through the throttle device.
Specifically, the throttling device can be immediately opened when the air conditioner enters a defrosting operation stage; or the throttling device can be opened only when the air conditioner reaches the set condition in the defrosting operation stage.
When the throttling device comprises an electromagnetic valve and a capillary tube connected with the electromagnetic valve in series, controlling the throttling device to be opened refers to controlling the electromagnetic valve to be opened; when the throttling device comprises an electronic expansion valve, controlling the opening of the throttling device refers to controlling the electronic expansion valve to be opened to an initial opening degree. The initial opening degree may be a preset parameter or a parameter determined based on the actual demand condition of the air conditioner. For example, the initial opening may be determined based on a temperature parameter (e.g., a varying parameter of an outdoor ambient temperature, a compressor discharge temperature, and/or an indoor ambient temperature, etc.).
It should be noted that, in the embodiment of the present invention, when the throttling device of the bypass line is opened, the compressor is operated at a constant frequency, which may be a preset frequency or a frequency determined based on the outdoor ambient temperature and/or the coil temperature of the outdoor heat exchanger.
The invention provides a defrosting method of an air conditioner, which is applied to the air conditioner which is communicated with an exhaust port of a compressor and a compression cavity with lower pressure through a bypass pipeline, wherein a throttling device is arranged in the bypass pipeline, the method controls the air conditioner to enter a defrosting operation stage when the air conditioner meets a set defrosting condition, after the air conditioner enters the defrosting operation stage, the throttling device is controlled to be opened, so that a part of refrigerant discharged by the compressor flows through the throttling device and enters the compression cavity with lower pressure, the exhaust gas of the compressor is mixed with low-temperature gas sucked by the compression cavity and then is compressed, the exhaust temperature is further improved, the power of the compressor is quickly increased in a short time in a starting stage, the temperature of the refrigerant entering an outdoor heat exchanger can be further increased, the frost formation of the outdoor unit is quickly melted, and the defrosting efficiency of the air conditioner is improved.
Further, in this embodiment, after step S20, the method further includes:
step S201, acquiring the current coil temperature of an outdoor heat exchanger and the target temperature of the coil of the outdoor heat exchanger under the condition that the air conditioner exits defrosting;
the current coil temperature of the outdoor heat exchanger is detected by a temperature sensor arranged on the outdoor heat exchanger.
The target temperature refers to the temperature value which is required to be reached by the coil temperature of the outdoor heat exchanger when the air conditioner exits the defrosting operation stage.
Step S202, determining the temperature difference between the coil temperature and the target temperature;
the absolute value of the difference between the coil temperature and the target temperature is taken as the temperature difference here.
And step S203, if the temperature difference is less than or equal to the set temperature difference, controlling the throttling device to reduce the opening or close.
The magnitude of the set temperature difference can be set based on actual requirements. If the actual temperature difference is smaller than or equal to the set temperature difference, the current air conditioner is close to finish defrosting, the opening degree of the throttling device is timely reduced or the throttling device is closed, the temperature of the compressor can be reduced, so that the compressor can be prevented from being started at an overhigh temperature when the defrosting operation stage is subsequently withdrawn and the heating operation stage is switched to be in heating operation, and the compressor is prevented from being damaged.
Further, based on the above embodiments, another embodiment of the defrosting method of the air conditioner of the present application is provided. In this embodiment, referring to fig. 6, the step S20 includes:
step S21, when the air conditioner enters the defrosting operation stage, acquiring the outdoor environment temperature and the current first exhaust temperature of the compressor;
the detection of the outdoor environment temperature can be specifically detected by a temperature sensor arranged in the outdoor environment, and can also be obtained by acquiring the weather temperature information of the area where the air conditioner is located. The current exhaust temperature of the compressor can be obtained by acquiring the data currently acquired by a temperature sensor arranged at the exhaust port of the compressor.
Step S22, acquiring a target exhaust temperature corresponding to the compressor according to the outdoor environment temperature;
the target discharge temperature specifically refers to a minimum value of the discharge temperature at which the output power of the compressor can make the defrosting efficiency greater than or equal to a set threshold value. It should be noted that the target discharge temperature is not the target temperature that the compressor discharge needs to reach, but is the critical temperature for triggering the throttle device to open.
Different outdoor ambient temperatures may correspond to different target discharge temperatures. Specifically, a correspondence between the outdoor ambient temperature and the target exhaust temperature may be established in advance, and the correspondence may be in the form of a formula, a mapping relationship, an algorithm model, or the like. The corresponding relation is obtained, and the target exhaust temperature corresponding to the current outdoor environment temperature can be determined.
And step S23, if the first exhaust temperature is less than or equal to the target exhaust temperature, executing the step of controlling the opening of the throttling device.
If the first exhaust temperature is lower than the target exhaust temperature, the current output power of the compressor is too low under the condition of the current outdoor environment temperature, and the outdoor unit cannot be defrosted quickly, and at the moment, a throttling device needs to be started to quickly improve the output power of the compressor, so that the outdoor unit is defrosted quickly; if the first exhaust temperature is higher than the target exhaust temperature, it indicates that the current output power of the compressor can quickly defrost the outdoor unit under the current outdoor environment temperature condition.
In this embodiment, through the steps S21 to S23, the target discharge temperature for triggering the throttle device to open is determined based on the outdoor ambient temperature, so as to ensure that the compressor can be timely opened when the defrosting efficiency of the outdoor unit is not good, and thus, rapid defrosting of the outdoor unit is achieved.
Specifically, in this embodiment, the set defrosting condition includes a defrosting trigger temperature corresponding to an outdoor environment, and the step S22 includes:
step S221, determining the temperature deviation between the outdoor environment temperature and the defrosting triggering temperature;
the defrosting triggering temperature refers to a critical temperature which is required to be reached by an outdoor environment temperature for triggering the air conditioner to enter a defrosting operation stage. Specifically, the outdoor ambient temperature is less than or equal to the defrosting trigger temperature, and the outdoor ambient temperature is considered to satisfy the set defrosting condition.
Based on this, the absolute value of the difference between the outdoor ambient temperature and the defrosting activation temperature is taken as the temperature deviation here.
Step S222, determining the target exhaust temperature according to the temperature deviation;
wherein the target exhaust temperature is in a decreasing trend as the temperature deviation increases. Conversely, the target exhaust temperature tends to decrease as the temperature deviation decreases.
Specifically, the correspondence between the temperature deviation and the target exhaust temperature may be preset, and may be a calculation formula, a mapping relationship, an algorithm model, or the like. Based on the correspondence, a target exhaust temperature corresponding to the current temperature deviation can be determined.
For example, the target exhaust temperature is T1 when the temperature deviation is a, and the target exhaust temperature is T2 when the temperature deviation is b, where a < b, and T1< T2. Based on the above, when the temperature deviation is a, the first exhaust temperature of the compressor is less than or equal to T1, and then the throttling device is opened; and when the temperature deviation is b, the second exhaust temperature of the compressor is less than or equal to T2, and the throttling device is opened.
Here, through the above steps S221 to S222, the larger the temperature deviation is, the larger the target discharge temperature is, the more serious the outdoor unit frosting is, the faster the throttle device is opened, the faster the discharge temperature of the compressor is raised, so as to increase the defrosting speed of the outdoor heat exchanger; the smaller the temperature deviation is, the smaller the target exhaust temperature is, so that when the outdoor unit frosts less, and the power of the compressor can ensure that the outdoor heat exchanger can defrost fast or defrost fast, the later the throttle device can be opened or even not opened, so as to ensure that the compressor maintains a reliable operation state, and the service life of the compressor is prolonged.
Further, based on any one of the above embodiments, another embodiment of the defrosting method of the air conditioner is provided. In this embodiment, referring to fig. 7, after step S20, the method further includes:
step S30, acquiring power characteristic parameters of the compressor;
in particular, the power characteristic parameter herein refers to a characteristic parameter that characterizes the magnitude of the compressor power. The power characteristic parameter may specifically comprise a discharge temperature of the compressor and/or an operating current of the compressor, etc. The higher the exhaust temperature is, the higher the output power of the compressor is; the smaller the discharge temperature, the smaller the output power of the compressor. The larger the running current is, the larger the output power of the compressor is; the smaller the operating current, the smaller the output power of the compressor.
And step S40, if the power characteristic parameter is less than or equal to the set power parameter, controlling the throttling device to increase the opening degree.
The set power parameter refers in particular to a maximum critical value of a power characteristic parameter set in advance for guaranteeing the reliability of the compressor. If the power characteristic parameter is less than or equal to the set power parameter, indicating that the compressor is in a reliable operation state; if the power characteristic parameter is larger than the set power parameter, the compressor power is further increased, so that the reliability risk exists and the compressor is even damaged.
It should be noted that the compressor power corresponding to the set power parameter is larger than the compressor power corresponding to the target discharge temperature in the above embodiment.
The opening degree of the throttling device can be increased according to the set range, the set speed and the like, and the adjusting parameter of the opening degree of the throttling device can also be determined according to the actual defrosting condition.
In this embodiment, the opening degree of the throttling device is increased to further increase the discharge temperature of the compressor when the compressor is ensured to operate reliably, so that the temperature of the refrigerant flowing into the outdoor heat exchanger from the discharge port of the compressor is further increased, and the defrosting efficiency of the outdoor unit is further improved.
Specifically, in this embodiment, the step of controlling the throttle device to increase the opening degree includes:
step S411, obtaining the temperature change parameter of the coil pipe of the outdoor heat exchanger after the throttling device is opened; the variation parameters may specifically include the amplitude of variation, the rate of variation, etc. of the coil temperature
Step S412, determining the adjustment parameters of the throttling device according to the variation parameters;
the adjustment parameters of the throttling device specifically include the adjustment amplitude, the adjustment rate, the operation duration of the adjusted opening degree and the like of the throttling device.
Different variation parameters correspond to different adjustment parameters. The corresponding relation between the variation parameters and the adjustment parameters can be preset and can also be obtained based on the actual condition of the defrosting operation stage. For example, the corresponding relationship between the variation parameter and the adjustment parameter may be different at different outdoor ambient temperatures. Therefore, the corresponding relation between the variation parameter and the adjustment parameter can be obtained based on the temperature interval in which the outdoor environment temperature is located, and the adjustment parameter of the throttling device corresponding to the variation parameter is determined based on the obtained corresponding relation.
And step S413, controlling the throttle device to increase the opening degree according to the adjustment parameter.
Here, through steps S411 to S413, the increase of the opening degree of the throttling device can be accurately matched with the actual defrosting condition of the outdoor unit, and the increase of the opening degree of the throttling device can ensure the effective improvement of the defrosting rate of the outdoor unit.
Specifically, the variation parameter includes a variation width, and based on this, the steps S411 to S412 include: acquiring the variation amplitude of the temperature of the coil pipe of the outdoor heat exchanger within a set time after the throttling device is started as the variation parameter; determining the opening degree adjustment amplitude of the throttling device according to the change amplitude; the opening degree adjustment amplitude is in a decreasing trend along with the increase of the variation amplitude; and taking the opening degree adjusting amplitude as the adjusting parameter. Here, the smaller the variation range of the temperature of the coil pipe of the indoor and outdoor heat exchanger is, the larger the opening adjustment range is, so that the opening of the throttling device can be greatly increased when the actual defrosting rate of the outdoor unit is slower, and the amount of refrigerant flowing back from the exhaust port of the compressor to the compression cavity with lower pressure is increased, so that the exhaust temperature can be greatly increased, the output power of the compressor can be rapidly increased, the heat emitted by the outdoor heat exchanger is increased, and the defrosting temperature of the outdoor unit can be further accelerated.
Further, based on any of the above embodiments, a defrosting method for an air conditioner according to the present application is further provided. In this embodiment, referring to fig. 8, after step S20, the method further includes:
and S50, controlling an electronic expansion valve to increase the opening, wherein the electronic expansion valve is a throttling device arranged between the indoor heat exchanger and the outdoor heat exchanger.
The electronic expansion valve can increase the opening degree by a set range, and the adjustment parameter of the opening degree of the electronic expansion valve is also determined based on the actual condition of the air conditioner in the defrosting operation stage.
In this embodiment, after the throttling device in the bypass pipeline of the compressor is opened, the opening degree of the electronic expansion valve between the indoor unit and the outdoor unit is further increased to increase the amount of the refrigerant flowing into the indoor heat exchanger from the outdoor heat exchanger, so that the return air temperature of the compressor is increased, and the refrigerant with the increased return air temperature passes through the further compressor, so that the exhaust air temperature of the compressor can be further increased, so that the refrigerant with higher temperature enters the outdoor heat exchanger to defrost the outdoor unit, and the defrosting efficiency of the outdoor unit is further increased.
It should be noted that, the sequence of the step S50 in this embodiment and the step S30 and the step S40 in the above embodiment is not particularly limited, and may be executed sequentially or synchronously according to actual requirements.
Further, before step S50, the return air temperature of the compressor may also be obtained; if the return air temperature is less than or equal to the minimum return air temperature corresponding to the reliable operation of the compressor, controlling the electronic expansion valve to reduce the opening degree; and if the return air temperature is higher than the minimum return air temperature, the step of controlling the electronic expansion valve to increase the opening degree is executed. The minimum return air temperature is specifically-7 c in this example. In other embodiments, the minimum return air temperature can be set to other temperatures according to actual requirements.
Because the reliability problem of the compressor can be caused by the excessively low return air temperature, when the return air temperature of the compressor is excessively low, the refrigerant input into the compressor is considered to be too much due to the excessively large opening degree of the electronic expansion valve, and on the basis, the opening degree of the electronic expansion valve can be controlled to be reduced so as to ensure the reliable operation of the compressor. And when the return air temperature is higher than the minimum return air temperature, the reliability problem of the compressor does not exist, and the opening degree of the electronic expansion valve can be further increased to further increase the exhaust temperature so as to quickly defrost the outdoor unit.
Specifically, in this embodiment, the step S50 specifically includes:
s51, acquiring a first change characteristic parameter corresponding to the exhaust temperature of the compressor, a second change characteristic parameter corresponding to the current of the compressor and/or a third change characteristic parameter corresponding to the temperature of the indoor heat exchanger;
the first variation characteristic parameter may specifically include a rate of change, a magnitude of change, and/or a trend of change, etc., of the compressor discharge temperature. The second variation characteristic parameter may specifically comprise a rate of change, a magnitude of change, and/or a trend of change of the compressor current, etc. The third variation characteristic parameter may specifically include a variation rate, a variation amplitude, a variation trend, and/or the like of the indoor heat exchanger temperature.
Specifically, the detection operation may be performed on the compressor discharge temperature, the compressor current, and the temperature of the indoor heat exchanger in the setting later period, and the first variation characteristic parameter, the second variation characteristic parameter, and the third variation characteristic parameter may be obtained through analysis based on data obtained through the detection operation.
Step S52, determining the adjustment range of the electronic expansion valve according to the first variation characteristic parameter, the second variation characteristic parameter and/or the third variation characteristic parameter;
specifically, different first variation characteristic parameters may correspond to different adjustment ranges of the electronic expansion valve; or the different second variation characteristic parameters can correspond to different adjustment ranges of the electronic expansion valve; or, the different third variation characteristic parameters may correspond to different adjustment ranges of the electronic expansion valve; or the different first variation characteristic parameter, second variation characteristic parameter and third variation characteristic parameter correspond to different adjustment amplitudes of the electronic expansion valve. The corresponding relation between the first variation characteristic parameter, the second variation characteristic parameter and/or the third variation characteristic parameter and the corresponding adjustment range can be preset, and the adjustment range of the current electronic expansion valve is determined based on the preset relation.
Specifically, in this embodiment, the first variation characteristic parameter, the second variation characteristic parameter, and the third variation characteristic parameter are used to determine the adjustment range of the electronic expansion valve, and the specific process is as follows: acquiring a first setting weight corresponding to the first change characteristic parameter, a second setting weight corresponding to the second change characteristic parameter and a third setting weight corresponding to the third change characteristic parameter; carrying out weighted average on the first change characteristic parameter, the second change characteristic parameter and the third change characteristic parameter according to the first set weight, the second set weight and the third set weight to obtain a target change characteristic parameter; determining the adjustment amplitude of the electronic expansion valve according to the target change characteristic parameter, wherein the adjustment amplitude is in an increasing trend along with the increase of the target change characteristic parameter; the first setting weight is larger than the third setting weight, and the second setting weight is larger than the third setting weight.
The first setting weight, the second setting weight, and the third setting weight may be preset weight information, or weight information obtained based on an operation parameter of the outdoor unit (such as an outdoor ambient temperature and/or an outdoor heat exchanger coil temperature). The weight of the temperature of the compressor and the weight of the current of the compressor are larger than the weight of the temperature of the indoor heat exchanger, so that the operation of the electronic expansion valve can be guaranteed, and the defrosting efficiency of the outdoor unit can be guaranteed to be improved preferentially.
Different target change characteristic parameters can correspond to different adjustment ranges of the electronic expansion valve. Specifically, the larger the target variation characteristic parameter is, the larger the adjustment range of the opening degree of the corresponding electronic expansion valve is.
And S53, controlling the electronic expansion valve to increase the opening according to the adjustment range.
In this embodiment, combine compressor exhaust temperature, electric current and indoor heat exchanger temperature to adjust the electronic expansion valve aperture to guarantee that electronic expansion valve's aperture adjustment can match with current refrigerant circulation circuit's the whole output condition, electronic expansion valve's accurate regulation and control guarantees that the system is whole to be operated in my nature.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where an air-conditioning control program is stored on the computer-readable storage medium, and when the air-conditioning control program is executed by a processor, the air-conditioning control program implements the relevant steps of any embodiment of the defrosting method of the air conditioner.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or the portions contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) as described above and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (16)
1. The defrosting method of the air conditioner is characterized in that the air conditioner comprises a compressor and a bypass pipeline, the compressor comprises a compression cavity, the compressor is provided with an exhaust port, the pressure in the compression cavity is smaller than or equal to a set threshold value, the bypass pipeline is communicated with the exhaust port and the compression cavity, the bypass pipeline is provided with a throttling device, and the defrosting method of the air conditioner comprises the following steps:
when the air conditioner meets the set defrosting condition, controlling the air conditioner to enter a defrosting operation stage; and
after the air conditioner enters the defrosting operation stage, controlling the throttle device to be opened so that a part of refrigerant discharged by the compressor flows through the throttle device and enters a compression cavity;
after the air conditioner enters the defrosting operation stage, the step of controlling the throttle device to be opened comprises the following steps:
when the air conditioner enters the defrosting operation stage, acquiring the outdoor ambient temperature and the current first exhaust temperature of the compressor;
acquiring a target exhaust temperature corresponding to the compressor according to the outdoor environment temperature; and
and if the first exhaust temperature is less than or equal to the target exhaust temperature, executing the step of controlling the throttle device to open.
2. The defrosting method of an air conditioner according to claim 1, wherein the set defrosting condition includes a defrosting trigger temperature corresponding to an outdoor environment, and the step of obtaining the target discharge temperature corresponding to the compressor according to the outdoor environment temperature includes:
determining a temperature deviation between the outdoor environment temperature and the defrosting triggering temperature; and
determining the target exhaust temperature according to the temperature deviation;
wherein the target exhaust temperature is in a decreasing trend as the temperature deviation increases.
3. The defrosting method of an air conditioner according to claim 1, further comprising, after the controlling of the throttling means to be turned on:
acquiring a power characteristic parameter of a compressor; and
and if the power characteristic parameter is less than or equal to the set power parameter, controlling the throttling device to increase the opening degree.
4. The defrosting method of an air conditioner according to claim 3, wherein the step of controlling the throttle device to increase the opening degree comprises:
acquiring the temperature change parameter of the coil pipe of the outdoor heat exchanger after the throttling device is started;
determining the adjustment parameters of the throttling device according to the variation parameters; and
and controlling the throttle device to increase the opening degree according to the adjusting parameters.
5. The defrosting method of an air conditioner according to claim 4, wherein the step of acquiring the variation parameter of the temperature of the coil of the outdoor heat exchanger after the throttle device is turned on comprises:
acquiring the variation amplitude of the temperature of the coil pipe of the outdoor heat exchanger within a set time after the throttling device is started as the variation parameter;
the step of determining an adjustment parameter of the throttling device according to the variation parameter comprises:
determining the opening degree adjustment amplitude of the throttling device according to the change amplitude; the opening degree adjustment amplitude is in a decreasing trend along with the increase of the change amplitude; and
and taking the opening degree adjustment amplitude as the adjustment parameter.
6. The defrosting method of an air conditioner according to claim 1, further comprising, after the step of controlling the opening of the throttling means:
acquiring the current coil temperature of an outdoor heat exchanger and the target temperature of the coil of the outdoor heat exchanger under the condition that the air conditioner exits defrosting;
determining a temperature difference between the coil temperature and the target temperature; and
and if the temperature difference is smaller than or equal to the set temperature difference, controlling the throttling device to reduce the opening or close.
7. The defrosting method of an air conditioner according to any one of claims 1 to 6, further comprising, after the step of controlling the opening of the throttling means:
and controlling an electronic expansion valve to increase the opening degree, wherein the electronic expansion valve is a throttling device arranged between the indoor heat exchanger and the outdoor heat exchanger.
8. The defrosting method of an air conditioner according to claim 7, wherein the step of controlling the opening degree of the electronic expansion valve to be increased includes:
acquiring a first change characteristic parameter corresponding to the exhaust temperature of a compressor, a second change characteristic parameter corresponding to the current of the compressor and/or a third change characteristic parameter corresponding to the temperature of an indoor heat exchanger;
determining the adjustment amplitude of the electronic expansion valve according to the first change characteristic parameter, the second change characteristic parameter and/or the third change characteristic parameter; and
and controlling the electronic expansion valve to increase the opening according to the adjustment amplitude.
9. The defrosting method of an air conditioner according to claim 8, wherein the step of determining the adjustment magnitude of the electronic expansion valve according to the first variation characteristic parameter, the second variation characteristic parameter and/or the third variation characteristic parameter comprises:
acquiring a first setting weight corresponding to the first variation characteristic parameter, a second setting weight corresponding to the second variation characteristic parameter and a third setting weight corresponding to the third variation characteristic parameter;
carrying out weighted average on the first change characteristic parameter, the second change characteristic parameter and the third change characteristic parameter according to the first set weight, the second set weight and the third set weight to obtain a target change characteristic parameter; and
determining the adjustment amplitude of the electronic expansion valve according to the target change characteristic parameter, wherein the adjustment amplitude is in an increasing trend along with the increase of the target change characteristic parameter;
wherein the first setting weight is greater than the third setting weight, and the second setting weight is greater than the third setting weight.
10. The defrosting method of an air conditioner according to claim 7, further comprising, before the controlling the electronic expansion valve to increase the opening degree:
acquiring the return air temperature of the compressor;
if the return air temperature is less than or equal to the minimum return air temperature corresponding to the reliable operation of the compressor, controlling the electronic expansion valve to reduce the opening degree; and
and if the return air temperature is higher than the minimum return air temperature, executing the step of controlling the electronic expansion valve to increase the opening degree.
11. An air conditioning control device characterized by comprising: a memory, a processor and an air conditioner control program stored on the memory and executable on the processor, the air conditioner control program when executed by the processor implementing the steps of the defrosting method of the air conditioner according to any one of claims 1 to 10.
12. An air conditioner, characterized in that the air conditioner comprises:
the compressor comprises a compression cavity, the compressor is provided with an exhaust port, and the pressure in the compression cavity is smaller than or equal to a set threshold value;
the bypass pipeline is communicated with the exhaust port and the compression cavity and is provided with a throttling device; and
the air conditioning control unit of claim 11, connected to the throttling device.
13. The air conditioner according to claim 12, further comprising a gas-liquid separator, wherein the compressor is further provided with a return port, a gas-phase outlet of the gas-liquid separator is connected to the return port through a first pipe, the compression chamber is communicated with the return port, and the bypass pipe is communicated with the exhaust port and the first pipe.
14. The air conditioner according to claim 12, wherein said compressor is further provided with a return port and a suction port, said compression chambers include a first compression chamber and a second compression chamber, a pressure in said second compression chamber is lower than a pressure in said first compression chamber, said suction port communicates with said first compression chamber, said return port communicates with said second compression chamber, and said bypass line communicates said discharge port with said suction port.
15. The air conditioner according to any one of claims 12 to 14, wherein said throttling means comprises an electronic expansion valve; or the throttling device comprises an electromagnetic valve and a capillary tube connected in series with the electromagnetic valve.
16. A computer-readable storage medium, characterized in that an air-conditioning control program is stored thereon, which when executed by a processor, implements the steps of the defrosting method of an air conditioner according to any one of claims 1 to 10.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2733441A2 (en) * | 2012-11-16 | 2014-05-21 | Mitsubishi Heavy Industries, Ltd. | Multi-type air conditioner |
| CN109631236A (en) * | 2018-12-14 | 2019-04-16 | 广东Tcl智能暖通设备有限公司 | Multi-connected air conditioner device and its Defrost method |
| CN110940055A (en) * | 2019-12-16 | 2020-03-31 | 宁波奥克斯电气股份有限公司 | Heating and defrosting control method and device for air conditioner and air conditioner |
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2020
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2733441A2 (en) * | 2012-11-16 | 2014-05-21 | Mitsubishi Heavy Industries, Ltd. | Multi-type air conditioner |
| CN109631236A (en) * | 2018-12-14 | 2019-04-16 | 广东Tcl智能暖通设备有限公司 | Multi-connected air conditioner device and its Defrost method |
| CN110940055A (en) * | 2019-12-16 | 2020-03-31 | 宁波奥克斯电气股份有限公司 | Heating and defrosting control method and device for air conditioner and air conditioner |
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