CN113108424A

CN113108424A - Air conditioner, heating control method thereof and computer readable storage medium

Info

Publication number: CN113108424A
Application number: CN202110551737.2A
Authority: CN
Inventors: 李金波; 吴延平; 邱向伟; 戚文端; 郑立宇; 杜顺开; 杨泾涛; 高�浩
Original assignee: GD Midea Air Conditioning Equipment Co Ltd; Guangdong Meizhi Compressor Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd; Guangdong Meizhi Compressor Co Ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2021-07-13
Anticipated expiration: 2041-05-20
Also published as: CN113108424B

Abstract

The invention discloses a heating control method of an air conditioner, based on the air conditioner comprising a gas-liquid separator and a compressor adopting independent compression, the air conditioner is respectively provided with a first throttling device and a second throttling device at a refrigerant inlet and a liquid phase outlet of the gas-liquid separator, and the method comprises the following steps: acquiring frosting state parameters of the outdoor heat exchanger in the heating process of the air conditioner; and when the frosting risk of the outdoor heat exchanger is determined according to the frosting state parameters, the first throttling device is controlled to reduce the opening degree, so that the temperature of the indoor heat exchanger of the air conditioner is higher than the set temperature of the heat exchanger, and the second throttling device is controlled to increase the opening degree, so that the temperature of the outdoor heat exchanger is improved. The invention also discloses an air conditioner and a computer readable storage medium. The invention aims to prevent the outdoor heat exchanger from frosting, reduce the indoor temperature fluctuation caused by refrigeration and defrosting and improve the thermal comfort of users.

Description

Air conditioner, heating control method thereof and computer readable storage medium

Technical Field

The present invention relates to the field of air conditioners, and in particular, to a heating control method for an air conditioner, and a computer-readable storage medium.

Background

When the air conditioner is in heating operation, high-temperature refrigerants flowing out of the compressor sequentially pass through the indoor heat exchanger, the throttling device and the outdoor heat exchanger, in the process, the indoor heat exchanger is in a heat release state, the outdoor heat exchanger is in a heat absorption state, the temperature of the outdoor heat exchanger is low, and the outdoor unit is prone to frosting.

At present, when the air conditioner detects that the outdoor unit frosts seriously in the heating process, the air conditioner is usually switched to the refrigerating operation, the indoor side of the air conditioner is in a heat absorption state at the moment, and the air conditioner does not have heat input to the indoor, so that the indoor temperature fluctuation can be caused, and the comfort of indoor users is influenced.

Disclosure of Invention

The invention mainly aims to provide a heating control method of an air conditioner, the air conditioner and a computer readable storage medium, aiming at preventing an outdoor heat exchanger from frosting, reducing indoor temperature fluctuation caused by refrigeration and defrosting and improving the thermal comfort of a user.

In order to achieve the above object, the present invention provides a heating control method of an air conditioner, which is characterized in that the air conditioner includes a compressor, an indoor heat exchanger, a first throttling device, a gas-liquid separator, a second throttling device and an outdoor heat exchanger, which are sequentially connected to form a refrigerant circulation loop, the compressor includes a first compression cylinder and a second compression cylinder which are independent of each other, the gas-liquid separator is provided with a refrigerant inlet, a liquid phase outlet and a gas phase outlet, one end of the first compression cylinder is communicated with the outdoor heat exchanger, the other end of the first compression cylinder is communicated with the indoor heat exchanger, one end of the second compression cylinder is communicated with the gas phase outlet, the other end of the second compression cylinder is communicated with the indoor heat exchanger, the gas-liquid separator is communicated with the first throttling device through the refrigerant inlet, the gas-liquid separator is communicated with the second throttling device through the liquid phase outlet, the heating control method of the air conditioner comprises the following steps:

acquiring frosting state parameters of the outdoor heat exchanger in the heating process of the air conditioner;

and when the frosting risk of the outdoor heat exchanger is determined according to the frosting state parameters, the first throttling device is controlled to reduce the opening degree, so that the temperature of the indoor heat exchanger of the air conditioner is higher than the set temperature of the heat exchanger, and the second throttling device is controlled to increase the opening degree, so that the temperature of the outdoor heat exchanger is improved.

Optionally, after the step of controlling the first throttling device to decrease the opening degree so as to make the temperature of the indoor heat exchanger of the air conditioner greater than the set heat exchanger temperature, and controlling the second throttling device to increase the opening degree so as to increase the temperature of the outdoor heat exchanger, the method further includes:

and returning to the step of obtaining the frosting state parameters of the outdoor heat exchanger until the outdoor heat exchanger has no frosting risk.

Optionally, the step of controlling the first throttling device to reduce the opening degree so as to make the temperature of the indoor heat exchanger of the air conditioner greater than the set heat exchanger temperature, and the step of controlling the second throttling device to increase the opening degree so as to increase the temperature of the outdoor heat exchanger comprises:

when the frosting risk of the outdoor heat exchanger is determined according to the frosting state parameters, updating a first target frequency; the first target times are the times of frosting risks of the outdoor heat exchanger according to the frosting state parameters in the process of circularly acquiring the frosting state parameters;

determining a first opening adjustment value of the first throttling device and a second opening adjustment value of the second throttling device according to the first target times;

controlling the first throttling device to reduce the opening degree according to the first opening degree adjusting value, and controlling the second throttling device to increase the opening degree according to the second opening degree adjusting value;

the first opening degree adjustment value is in an increasing trend along with the increase of the first target times, and the second opening degree adjustment value is in an increasing trend along with the increase of the first target times.

Optionally, the step of determining a first opening degree adjustment value of the first throttle device and a second opening degree adjustment value of the second throttle device according to the first target number of times includes:

acquiring the exhaust temperature of the compressor;

determining a target opening degree adjusting value according to the exhaust temperature;

determining a first reference opening degree adjustment value according to the first weight and the target opening degree adjustment value, and determining a second reference opening degree adjustment value according to the second weight and the target opening degree adjustment value;

and correcting the first reference opening degree adjustment value according to the first target times to obtain a first opening degree adjustment value, and correcting the second reference opening degree adjustment value according to the first target times to obtain a second opening degree adjustment value.

controlling the first throttling device to reduce the opening degree so that the temperature of an indoor heat exchanger of the air conditioner is greater than the temperature of a set heat exchanger;

acquiring the pressure and the temperature of the gas-liquid separator in the process of reducing the opening of the first throttling device;

when the pressure of the gas-liquid separator reaches a target pressure and the temperature of the gas-liquid separator reaches a target temperature, controlling the second throttling device to increase the opening degree so as to increase the temperature of the outdoor heat exchanger;

and determining the target pressure according to the discharge pressure and the return pressure of the compressor, and determining the target temperature according to the target pressure.

Optionally, the controlling the first throttling device to reduce the opening degree so as to make the temperature of the indoor heat exchanger of the air conditioner greater than the set heat exchanger temperature and the controlling the second throttling device to increase the opening degree so as to increase the temperature of the outdoor heat exchanger, simultaneously with or after the step of controlling the first throttling device to reduce the opening degree so as to make the temperature of the indoor heat exchanger of the air conditioner greater than the set heat exchanger temperature, further comprises:

increasing the rotating speed of an outdoor fan of the air conditioner, and/or reducing the rotating speed of an indoor fan of the air conditioner.

Optionally, the step of increasing the rotation speed of the outdoor fan of the air conditioner and/or the step of decreasing the rotation speed of the indoor fan of the air conditioner includes:

when the frosting risk of the outdoor heat exchanger is determined according to the frosting state parameters, updating a second target frequency; the second target times are the times of frosting risks of the outdoor heat exchanger according to the frosting state parameters in the process of circularly obtaining the frosting state parameters;

determining a first rotating speed adjusting value and/or a second rotating speed adjusting value according to the second target times;

controlling the outdoor fan to operate at the first rotating speed adjusting value to increase the rotating speed, and/or controlling the indoor fan to operate at the second rotating speed adjusting value to decrease the rotating speed;

the first rotating speed adjusting value is in an increasing trend along with the increase of the second target times, and the second rotating speed adjusting value is in an increasing trend along with the increase of the second target times.

Optionally, a refrigerant port of the outdoor heat exchanger, which is close to one end of the second throttling device, is defined as a target position, and the frosting state parameter is a temperature parameter of the target position.

Optionally, the temperature parameters include a current temperature value of the target location and a temperature variation trend of the target location, and after the step of obtaining the frosting status parameter of the outdoor heat exchanger, the method further includes:

when the temperature value is less than or equal to a preset temperature and the temperature change trend is a descending trend, determining that the outdoor heat exchanger has a frosting risk;

wherein the preset temperature is greater than the set frosting temperature of the outdoor heat exchanger.

In addition, in order to achieve the above object, the present application also provides an air conditioner including a control device, and a compressor, an indoor heat exchanger, a first throttling device, a gas-liquid separator, a second throttling device, and an outdoor heat exchanger connected to form a refrigerant circulation loop, the compressor comprises a first compression cylinder and a second compression cylinder which are mutually independent, the gas-liquid separator is provided with a refrigerant inlet, a liquid phase outlet and a gas phase outlet, one end of the first compression cylinder is communicated with the outdoor heat exchanger, the other end of the first compression cylinder is communicated with the indoor heat exchanger, one end of the second compression cylinder is communicated with the gas phase outlet, the other end of the second compression cylinder is communicated with the indoor heat exchanger, the gas-liquid separator is communicated with the first throttling device through the refrigerant inlet, and the gas-liquid separator is communicated with the second throttling device through the liquid phase outlet;

wherein the first throttling device and the second throttling device are both connected with the control device, and the control device comprises: the heating control program of the air conditioner realizes the steps of the heating control method of the air conditioner according to any one of the above items when being executed by the processor.

In addition, in order to achieve the above object, the present application also proposes a computer readable storage medium having a heating control program of an air conditioner stored thereon, the heating control program of the air conditioner, when being executed by a processor, implementing the steps of the heating control method of the air conditioner as recited in any one of the above.

The invention provides a heating control method of an air conditioner, wherein a refrigerant inlet and a liquid phase outlet of a gas-liquid separator of a refrigerant circulation loop of the air conditioner are respectively provided with a first throttling device and a second throttling device, when the frosting risk of an outdoor heat exchanger is found based on frosting state parameters of the outdoor heat exchanger in the heating process of the air conditioner, the temperature of a medium-temperature refrigerant flowing into the outdoor heat exchanger from the gas-liquid separator can be improved while the temperature of the indoor heat exchanger is too low through the reduction of the opening degree of the first throttling device and the increase of the opening degree of the second throttling device, the frosting of the outdoor heat exchanger can be effectively prevented, the air conditioner does not need to be refrigerated and defrosted to operate, on the basis, the compressor adopts double cylinders to respectively and independently compress two paths of refrigerants flowing back to the compressor from the outdoor heat exchanger and the gas-liquid separator, the energy efficiency of the compressor can be improved through the independent compression and the gas-liquid separator, the enthalpy value of the refrigerant lost by the opening degree adjustment of the first throttling device and the second throttling device is effectively compensated, so that the indoor heat exchanger can input stable heat to the indoor space, the indoor temperature fluctuation is reduced, and the thermal comfort of a user is improved.

Drawings

FIG. 1 is a schematic structural diagram of a refrigerant system in an embodiment of an air conditioner according to the present invention;

FIG. 2 is a schematic diagram of the hardware configuration involved in the operation of heating control of an embodiment of the air conditioner of the present invention;

FIG. 3 is a flowchart illustrating a heating control method of an air conditioner according to an embodiment of the present invention;

FIG. 4 is a schematic flow chart illustrating a heating control method of an air conditioner according to another embodiment of the present invention;

FIG. 5 is a schematic flow chart illustrating a heating control method of an air conditioner according to another embodiment of the present invention;

fig. 6 is a flowchart illustrating a heating control 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: based on an air conditioner which is provided with a compressor and a gas-liquid separator which are independently compressed and is respectively provided with a first throttling device and a second throttling device at a refrigerant inlet and a liquid phase outlet of the gas-liquid separator, acquiring frosting state parameters of the outdoor heat exchanger when the air conditioner is in a heating state; and when the frosting risk of the outdoor heat exchanger is determined according to the frosting state parameters, controlling the second throttling device to increase the opening degree so as to enable the temperature of the indoor heat exchanger of the air conditioner to be higher than the temperature of the set heat exchanger, and controlling the first throttling device to decrease the opening degree so as to improve the temperature of the outdoor heat exchanger.

Because among the prior art, when detecting that the off-premises station frosted seriously in the air conditioner heating process, switch over the air conditioner to the refrigeration operation usually, the indoor side of air conditioner is in the heat absorption state this moment, and the air conditioner does not have the heat input to indoor, can lead to indoor temperature fluctuation, influences indoor user's travelling comfort.

The invention provides the solution, and aims to effectively avoid the over-low temperature of the outdoor heat exchanger, effectively prevent the outdoor heat exchanger from frosting, enable the air conditioner to operate without refrigeration and defrosting, reduce the indoor temperature fluctuation and improve the thermal comfort of users.

The embodiment of the invention provides an air conditioner. The air conditioner may be a wall-mounted air conditioner, a cabinet air conditioner, a mobile air conditioner, a window air conditioner, etc.

In the present embodiment, referring to fig. 1, the air conditioner includes a compressor 1, an indoor heat exchanger 2, a first throttling device 3, a gas-liquid separator 4, a second throttling device 5, and an outdoor heat exchanger 6, which are sequentially connected to form a refrigerant circulation circuit.

The first throttling device 3 and the second throttling device 5 can be set as throttling components with adjustable arbitrary opening degrees according to actual requirements. In the present embodiment, the first throttle 3 and the second throttle 5 are electronic expansion valves. In other embodiments, the first throttle device 3 and the second throttle device 5 may be formed by connecting a plurality of capillaries in parallel and by a flow path switching module.

The gas-liquid separator 4 is specifically a device for separating a gaseous refrigerant and a liquid refrigerant, and is, for example, the gas-liquid separator 4. The refrigerant can be separated into a gaseous refrigerant and a liquid refrigerant after entering the gas-liquid separator 4, the gaseous refrigerant flows back to the compressor 1, and the liquid refrigerant enters the heat exchanger after being throttled and depressurized by the throttling device.

Specifically, in this embodiment, the compressor 1 is provided with an exhaust port, a return air port and an air supplement port, the gas-liquid separator 4 is provided with a refrigerant inlet, a liquid-phase outlet and a gas-phase outlet, one end of the indoor heat exchanger 2 is communicated with the exhaust port, the other end of the indoor heat exchanger 2 is communicated with the first throttling device 3, one end of the first throttling device 3 is communicated with the indoor heat exchanger 2, the other end of the first throttling device 3 is communicated with the refrigerant inlet of the gas-liquid separator 4, the gas-phase outlet of the gas-liquid separator 4 is communicated with the air supplement port of the compressor 1, one end of the second throttling device 5 is communicated with the liquid-phase outlet of the gas-liquid separator 4, the other end of the second throttling device 5 is communicated with the outdoor heat exchanger 6, one end of the outdoor heat exchanger 6 is communicated with the second throttling device 5.

Based on the loop, when the air conditioner operates in heating mode, as shown by the arrow in fig. 1, the refrigerant flowing out of the compressor 1 sequentially passes through the indoor heat exchanger 2 and the first throttling device 3 and then enters the gas-liquid separator 4, the gaseous refrigerant and the liquid refrigerant are separated in the gas-liquid separator 4, the gaseous refrigerant enters the compressor 1 from the air supplement port of the compressor 1 to supplement air and increase enthalpy, and the liquid refrigerant further throttles by the second throttling device 5 and then flows back to the compressor 1 after entering the outdoor heat exchanger 6.

Further, referring to fig. 1, the air conditioner may be further provided with a four-way valve 7 so that the air conditioner may be switched between a heating operation and a cooling operation. The four-way valve 7 is specifically provided with a first interface, a second interface, a third interface and a fourth interface, the first interface of the four-way valve 7 is connected with an exhaust port of the compressor 1, the second interface of the four-way valve 7 is connected with a return air port of the compressor 1, the third interface of the four-way valve 7 is connected with the outdoor heat exchanger 6, and the fourth interface of the four-way valve 7 is connected with the indoor heat exchanger 2.

The four-way valve 7 is provided with a refrigerating valve position and a heating valve position, under the heating valve position, the air conditioner performs heating operation, the indoor heat exchanger 2 is in a heat release state, and the outdoor heat exchanger 6 is in a heat absorption state; under the refrigeration valve position, the air conditioner operates in a refrigeration mode, the indoor heat exchanger 2 is in a heat absorption state, and the outdoor heat exchanger 6 is in a heat release state. The switching between the cooling operation and the heating operation of the air conditioner can be realized by controlling the switching of the valve position of the four-way valve 7.

During the cooling operation, the refrigerant flowing out of the compressor 1 sequentially passes through the outdoor heat exchanger 6 and the second throttling device 5 and then enters the gas-liquid separator 4, after gas-liquid separation in the gas-liquid separator 4, the gas refrigerant enters the compressor 1 from the gas supplementing port to supplement gas and increase enthalpy, and the liquid refrigerant flows back to the compressor 1 after passing through the indoor heat exchanger 2 after passing through the first throttling device 3.

Further, in the present embodiment, the compressor 1 includes a first compression cylinder and a second compression cylinder which are independent from each other, one end of the first compression cylinder is communicated with the outdoor heat exchanger 6, the other end of the first compression cylinder is communicated with the indoor heat exchanger 2, one end of the second compression cylinder is communicated with the gas phase outlet, and the other end of the second compression cylinder is communicated with the indoor heat exchanger 2. When the air conditioner is provided with the four-way valve 7, one end of the first compression cylinder is communicated with a first interface of the four-way valve 7, and one end of the second compression cylinder is communicated with a second interface of the four-way valve 7. Specifically, in this embodiment, the compressor 1 is further provided with an exhaust cavity in addition to the first compression cylinder and the second compression cylinder, the exhaust cavity is provided with an exhaust port of the compressor 1, the first compression cavity is provided with an air return port of the compressor 1, the second compression cavity is provided with an air supply port of the compressor 1, and the first compression cylinder and the second compression cylinder are both communicated with the exhaust cavity. Based on this, the refrigerant that flows back to compressor 1 from the return air inlet of compressor 1, and the refrigerant that flows back to compressor 1 from the tonifying qi mouth of compressor 1, the independent compression of accessible different compression cylinders, reentrant exhaust chamber mixes after the compression is accomplished, discharge from the gas vent of compressor 1 after mixing and circulate in above-mentioned each part again and flow back to the compressor, can avoid the return air of compressor and the loss of refrigerant enthalpy value that the tonifying qi mixes before the compression leads to, effectively improve the efficiency of compressor 1. When the air conditioner is in heating operation, if the opening degree of the first throttling device 3 and the opening degree of the second throttling device 5 are adjusted to cause enthalpy loss of a refrigerant, the enthalpy loss can be compensated through the effect of air supplement and enthalpy increase of the independent compression and the gas-liquid separator 4, the stability of heat input into the indoor environment by the indoor heat exchanger 2 can be guaranteed while the energy efficiency is improved, and the temperature fluctuation of the indoor environment is effectively avoided.

It should be noted that, in other embodiments, the compressor 1 may also be configured as a single-cylinder compressor 1 according to actual requirements.

Further, the air conditioner may further include an indoor fan 8 and an outdoor fan 9, the indoor fan 8 is disposed corresponding to the indoor heat exchanger 2, and the outdoor fan 9 is disposed corresponding to the outdoor heat exchanger 6.

Further, in this embodiment, the air conditioner may further include a temperature detection module 01, and the temperature detection module 01 may be one or more than one according to actual requirements. Specifically, the temperature detection module 01 may be disposed at a refrigerant port of the outdoor heat exchanger 6 near one end of the second throttling device 5, so as to detect a temperature of a refrigerant flowing into the outdoor heat exchanger 6 in the heating mode. In addition, the temperature detection module 01 can be arranged at the refrigerant port and/or the middle part of the coil pipe at one end of the outdoor heat exchanger 6 close to the compressor 1 according to actual requirements. In addition, the temperature detection module 01 may also be provided within the gas-liquid separator 4 for detecting the temperature of the gas-liquid separator 4.

The air conditioner can also be provided with a pressure detection module 02, and the pressure detection module 02 can be provided with one or more than one according to actual requirements. Specifically, the pressure detection module 02 may be disposed at a discharge port and/or a return port of the compressor 1, and is used for detecting a discharge pressure and/or a return pressure of the compressor 1. Further, a pressure detection module 02 may be provided within the gas-liquid separator 4 for detecting the pressure of the gas-liquid separator 4.

Further, in the present embodiment, the viscosity of the refrigerant circulating through the above components is greater than a preset viscosity threshold, for example, R290 environmental refrigerant is adopted. And/or the pipe diameter of the indoor heat exchanger 2 and/or the outdoor heat exchanger 6 is smaller than a preset size threshold value. Refrigerant viscosity is big or the heat exchanger pipe diameter is hour, the refrigerant can slow down at the flow rate of outdoor heat exchanger 6, during the heating operation, the refrigerant is gathered easily in the heat exchanger, cold volume is difficult to distribute and is caused the frosting to accelerate, based on this, the independent compression fit vapour and liquid separator 4 of 1 double-cylinder of compressor increases the enthalpy effect, be favorable to improving the velocity of flow of refrigerant, wherein, further cooperate the reduction of 3 apertures of first throttling arrangement and the increase of 5 apertures of second throttling arrangement, be favorable to guaranteeing that the refrigerant can not gather at outdoor heat exchanger 6, can effectively prevent frosting of outdoor heat exchanger 6.

Further, in this embodiment, the air conditioner further includes a control device. Referring to fig. 2, the compressor 1, the first throttling device 3, the second throttling device 5, the temperature detection module 01, the pressure detection module 02, the indoor fan 8, and the outdoor fan 9 may all be connected to the control device.

In an embodiment of the present invention, referring to fig. 2, the control device includes: a processor 1001 (e.g., a CPU), a memory 1002, a timer 1003, and the like. 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 processor 1001, the memory 1002, and the timer 1003 may be connected by a communication bus.

Those skilled in the art will appreciate that the configuration of the device shown in fig. 2 is not intended to be limiting 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. 2, a heating control program of the air conditioner may be included in the memory 1002, which is a kind of computer readable storage medium. In the apparatus shown in fig. 2, the processor 1001 may be configured to call a heating control program of the air conditioner stored in the memory 1002, and perform operations of relevant steps of a heating control method of the air conditioner in the following embodiments.

The embodiment of the invention also provides a heating control method of the air conditioner, which is applied to the air conditioner.

Referring to fig. 3, an embodiment of a heating control method of an air conditioner according to the present application is provided. In this embodiment, the heating control method of the air conditioner includes:

step S10, acquiring frosting state parameters of the outdoor heat exchanger in the heating process of the air conditioner;

specifically, the frosting state parameter is a parameter used for representing whether the outdoor heat exchanger is frosted or not at present, the frosting trend and other states. The frosting condition parameter may be a temperature parameter and/or a pressure parameter, etc. For example, the temperature of the outdoor heat exchanger and/or the indoor ambient temperature may be detected as the frosting state parameter herein, the return air pressure may be detected as the frosting state parameter herein, and so on.

In the heating process of the air conditioner, the frosting state parameters can be acquired in real time or at intervals of set time.

And step S20, when the frosting risk of the outdoor heat exchanger is determined according to the frosting state parameters, controlling the first throttling device 3 to reduce the opening degree so as to enable the temperature of the indoor heat exchanger of the air conditioner to be larger than the set heat exchanger temperature, and controlling the second throttling device 5 to increase the opening degree so as to improve the temperature of the outdoor heat exchanger.

The frosting risk refers to a state that the frosting phenomenon occurs in the outdoor heat exchanger when the outdoor heat exchanger is not frosted yet and the air conditioner keeps the current state to continuously operate for a time less than or equal to a set time, and the frosting tendency of the outdoor heat exchanger exists in the state.

The frosting state of the outdoor heat exchanger determined according to the frosting state parameter may specifically include a non-frosting state and a frosted state, and in the non-frosting state, the non-frosting state may be subdivided into a first state in which a frosting risk exists and a second state in which the frosting risk does not exist. The frosting risk is not particularly the frosting risk of the outdoor heat exchanger, and the frosting phenomenon of the outdoor heat exchanger is not generated when the air conditioner is maintained to continuously operate in the current state for more than the set time, so that the frosting tendency of the outdoor heat exchanger does not exist in the state. The temperature of the outdoor heat exchanger corresponding to the non-frosted state is higher than that of the outdoor heat exchanger corresponding to the frosted state, and the temperature of the outdoor heat exchanger corresponding to the first state is lower than that of the outdoor heat exchanger corresponding to the second state.

The conditions required to be achieved by the frosting state parameters of the outdoor heat exchanger in different states are different, on the basis of the conditions, the conditions required to be achieved by the frosting state parameters when the frosting risk exists in the outdoor heat exchanger are preset as target conditions, if the current frosting state parameters of the outdoor heat exchanger meet the target conditions, the current frosting risk of the outdoor heat exchanger can be determined, the air conditioner can be controlled to maintain heating operation at the moment, the first throttling device 3 is controlled to reduce the opening, and the second throttling device 5 is controlled to increase the opening; the current frosting state parameter of the outdoor heat exchanger does not meet the target condition, and the current frosting risk of the outdoor heat exchanger is determined to be absent or in a frosted state. The method comprises the steps that a condition required to be met by a frosting state parameter when an outdoor heat exchanger is in a frosting state can be preset as a first condition, when the current frosting state parameter of the outdoor heat exchanger meets the first condition, the outdoor heat exchanger can be considered to be in the frosting state, and at the moment, the air conditioner can be controlled to be switched from the current heating operation to the cooling operation; if the current frosting state parameter of the outdoor heat exchanger does not meet the first condition or the target condition, the outdoor heat exchanger is considered to have no frosting risk, and the air conditioner can be controlled to maintain the current state to operate.

For example, the frosting temperature of the outdoor heat exchanger is 0 ℃, if the temperature of the outdoor heat exchanger is detected to be less than or equal to 0 ℃, the outdoor heat exchanger can be considered to be in a frosted state, and the air conditioner is controlled to be switched from the heating operation to the cooling operation; if the temperature of the outdoor heat exchanger is detected to be greater than 0 ℃ and less than or equal to 5 ℃, the outdoor heat exchanger is in an unfrozen state and the frosting risk exists, the air conditioner is controlled to maintain heating operation, the first throttling device 3 is controlled to reduce the opening, and the second throttling device 5 is controlled to increase the opening; if the temperature of the outdoor heat exchanger is detected to be greater than or equal to 5 ℃, the outdoor heat exchanger can be considered to be in a non-frosting state and has no frosting risk, and the air conditioner can be controlled to maintain the heating operation in the current state.

The reduction of the opening degree of the first throttling device 3 and the increase of the opening degree of the second throttling device 5 can improve the temperature of the refrigerant entering the outdoor heat exchanger, so that the cold output by the outdoor heat exchanger is reduced, the frosting risk of the outdoor heat exchanger is reduced, and the temperature of the indoor heat exchanger can be maintained to be higher than the temperature of the set heat exchanger. The temperature of the set heat exchanger can be preset temperature or temperature set according to actual conditions (for example, temperature value determined according to the current temperature of indoor environment or the set temperature of the air conditioner), the temperature of the indoor heat exchanger is maintained above the temperature of the set heat exchanger, the air exhaust side pressure and the air return side pressure of the compressor can be maintained above a set pressure threshold while frosting is prevented, the air outlet temperature of the air conditioner cannot be too low, and fluctuation of the indoor environment temperature in the frosting prevention process is effectively avoided. The opening degree of the first throttling device 3 is reduced and the opening degree of the second throttling device 5 is increased in a matched mode, so that the temperature of a refrigerant of the outdoor heat exchanger is higher than the freezing point temperature, and the frosting phenomenon of the outdoor heat exchanger is effectively prevented.

The reduction of the opening degree of the first throttle 3 and the increase of the opening degree of the second throttle 5 may be performed simultaneously or sequentially according to actual demands. Specifically, the opening degree of the first throttle device 3 may be decreased first and then the opening degree of the second throttle device 5 may be increased, or the opening degree of the second throttle device 5 may be increased first and then the opening degree of the first throttle device 3 may be decreased. In the embodiment, the opening degree of the first throttling device 3 is reduced, and then the opening degree of the second throttling device 5 is increased, so that the change of the system pressure difference caused when the opening degree of the second throttling device 5 is increased is reduced, the stability of the system when the opening degree of the second throttling device 5 is adjusted is ensured, the change of heat input to the indoor heat exchanger can be reduced, and the fluctuation of the indoor environment temperature is avoided.

Specifically, the opening degree of the first throttling device 3 and/or the opening degree of the second throttling device 5 may be adjusted according to a preset fixed adjustment parameter, or may be adjusted based on an adjustment parameter determined by the actual operation condition of the air conditioner. The opening degree of the first throttle device 3 and the opening degree of the second throttle device 5 may be adjusted by the same adjustment parameter or may be adjusted by different adjustment parameters.

The opening degree of the first throttle device 3 and the opening degree of the second throttle device 5 may be adjusted at one time or may be adjusted in steps. When the opening degree of the first throttle device 3 and the opening degree of the second throttle device 5 are adjusted a plurality of times, the opening degree adjustment parameters may be the same or different each time the opening degrees of the first throttle device 3 and the second throttle device 5 are adjusted. For example, when the opening degrees of the first throttle device 3 and the second throttle device 5 are adjusted a plurality of times, the opening degrees of the first throttle device 3 and the second throttle state 5 may tend to increase as the number of adjustments increases. Alternatively, before each adjustment, the frosting risk of the first throttling device 3 and the second throttling device 5 may be determined based on the frosting state parameter (for example, the closer the outdoor heat exchanger temperature is to 0 degree, the higher the risk is), and the opening degree of the first throttling device 3 and the second throttling device 5 may be increased along with the increase of the frosting risk.

Here, the adjustment parameter specifically includes an opening adjustment amplitude and/or an opening adjustment rate.

The embodiment of the invention provides a heating control method of an air conditioner, the air conditioner is respectively provided with a first throttling device 3 and a second throttling device 5 at a refrigerant inlet and a liquid phase outlet of a gas-liquid separator of a refrigerant circulation loop, when the frosting risk of an outdoor heat exchanger is found based on the frosting state parameters of the outdoor heat exchanger in the heating process of the air conditioner, the temperature of a medium-temperature refrigerant flowing into the outdoor heat exchanger from the gas-liquid separator can be improved while the temperature of the indoor heat exchanger is too low through the opening degree reduction of the first throttling device 3 and the opening degree increase of the second throttling device 5, the frosting of the outdoor heat exchanger can be effectively prevented by effectively avoiding the too low temperature of the outdoor heat exchanger, the air conditioner does not need to be refrigerated and defrosted to operate, on the basis, the compressor adopts two double cylinders to respectively and independently compress two paths of refrigerants flowing back to the compressor from the outdoor heat exchanger, the energy efficiency of the compressor can be improved through the air supply enthalpy increasing effect of the independent compression and the gas-liquid separator on the compressor, the lost refrigerant enthalpy value is adjusted through the opening degree of the first throttling device 3 and the opening degree of the second throttling device 5, so that the indoor heat exchanger can input stable heat to the indoor space, the indoor temperature fluctuation is reduced, and the thermal comfort of a user is improved.

Further, in this embodiment, after step S10, the method further includes:

and when the frosting risk of the outdoor heat exchanger is determined to be absent according to the frosting state parameters, acquiring the exhaust temperature of the compressor 1, and adjusting the opening degree of the first throttling device 3 and the opening degree of the second throttling device 5 according to the exhaust temperature and the target exhaust temperature so as to enable the exhaust temperature of the compressor 1 to be consistent with the target exhaust temperature.

Further, in this embodiment, the compressor 1 includes a first compression cylinder and a second compression cylinder that are independent of each other, the gas-liquid separator is further provided with a gas phase outlet in addition to a liquid phase outlet and a refrigerant inlet, the outdoor heat exchanger is communicated with one end of the first compression cylinder, the indoor heat exchanger is communicated with the other end of the first compression cylinder, the gas phase outlet is communicated with one end of the second compression cylinder, and the indoor heat exchanger is communicated with the other end of the second compression cylinder. Based on this, when compressor 1 independently compresses the refrigerant that its return air inlet got into and the refrigerant that the tonifying qi mouth got into, at the in-process that reduces 3 apertures of first throttling arrangement and increase 5 apertures of second throttling arrangement, vapour and liquid separator's tonifying qi increases the independent compression effect of enthalpy function cooperation compressor 1, be favorable to guaranteeing to reduce 3 apertures of first throttling arrangement and increase 5 apertures of second throttling arrangement in-process and cause the enthalpy value accessible of refrigerant loss and the cooperation realization compensation of vapour and liquid separator's of independent compression of compressor 1 of enthalpy value accessible, when guaranteeing to prevent outdoor heat exchanger frosting, indoor heat exchanger's heat transfer volume can not reduce, with effectively avoiding indoor ambient temperature's fluctuation, guarantee indoor user's thermal comfort.

Further, in this embodiment, a refrigerant port of the outdoor heat exchanger near one end of the second throttling device 5 is defined as a target position, and the frosting state parameter is a temperature parameter of the target position. On the basis, the temperature of the refrigerant flowing into the outdoor heat exchanger is obtained to serve as a characterization parameter for judging whether the outdoor heat exchanger has the frosting risk, so that the timeliness of regulation and control is guaranteed, the refrigerant with too low temperature is prevented from entering the outdoor heat exchanger, and the effect of delaying frosting is further improved.

In this embodiment, the temperature parameters include a current temperature value of the target location and a temperature variation trend of the target location, and after the step of obtaining the frosting status parameter of the outdoor heat exchanger, the method further includes: when the temperature value is less than or equal to a preset temperature and the temperature change trend is a descending trend, determining that the outdoor heat exchanger has a frosting risk; and when the temperature value is greater than a preset temperature or when the temperature change trend is an ascending trend, determining that the outdoor heat exchanger does not have the frosting risk. Wherein the preset temperature is greater than the set frosting temperature of the outdoor heat exchanger. The frosting temperature setting here is specifically a temperature at which the outdoor heat exchanger is frosted, which is set in advance, for example, 0 ℃.

Specifically, in the heating operation process of the air conditioner, the temperature of the outdoor heat exchanger is detected at intervals of a set duration. The temperature of the outdoor heat exchanger can be obtained by acquiring data detected in real time by a temperature detection module arranged on a target position. The set time period can be set according to actual requirements, and in the embodiment, the set time period is 3. In other embodiments, the set time period may also be set to a longer or shorter time period, such as 1min, 4min, 5min, 10min, etc., according to actual requirements. Specifically, the outdoor ambient temperature may be acquired, and the set time period herein may be acquired based on the outdoor ambient temperature. The lower the outdoor environment temperature is, the shorter the acquired set time period may be, and the higher the outdoor environment temperature is, the longer the acquired set time period may be.

Specifically, in the temperature detection data of the outdoor heat exchanger, the temperatures of the outdoor heat exchanger adjacent to each other at any two detection times are defined as a first temperature and a second temperature, the detection time of the first temperature is earlier than the detection time of the second temperature, and the second temperature may specifically refer to the temperature of the outdoor heat exchanger currently detected at any time. Thus, the second temperature may be the current temperature value of the outdoor heat exchanger. The trend of the temperature of the outdoor heat exchanger can be determined by comparing the magnitude relation of the first temperature and the second temperature or determining the magnitude relation of the first temperature and the second temperature. Specifically, when the first temperature is higher than the second temperature, it may be determined that the temperature change tendency is a downward tendency, and when the first temperature is lower than the second temperature, it may be determined that the temperature change tendency is an upward tendency. Alternatively, a difference between the first temperature and the second temperature is determined, for example, as a result of the first temperature-the second temperature, and when the difference is less than 0, the temperature change trend may be regarded as an upward trend, and when the difference is greater than 0, the temperature change trend may be regarded as a downward trend.

Through this mode, the temperature through flowing into the refrigerant at outdoor heat exchanger does not reach the temperature of frosting and when falling the change to the temperature of frosting, judges that outdoor heat exchanger has the risk of frosting, is favorable to whether having the risk of frosting to outdoor heat exchanger and realizes accurate sign, improves the timeliness that parts such as first throttling set 3 and second throttling set 5, fan were adjusted, ensures that the outdoor heat exchanger can not appear the condition of frosting.

Specifically, in order to further improve the accuracy of the indication of the frosting risk, in this embodiment, when determining the deviation between the first temperature and the second temperature, where the deviation is an absolute value of a difference between the first temperature and the second temperature, based on which, when the temperature value (i.e. the second temperature) is less than or equal to a preset temperature and the temperature variation trend is a downward trend, if the deviation is greater than or equal to the preset deviation, it may be determined that the outdoor heat exchanger has the frosting risk; when the temperature value (i.e., the second temperature) is less than or equal to the preset temperature and the temperature variation trend is a descending trend, if the deviation amount is less than the preset deviation, it is determined that the outdoor heat exchanger is not at risk of frosting. The preset deviation can be obtained according to the rated refrigerating capacity of the air conditioner.

Further, based on the above embodiments, another embodiment of the heating control method of the air conditioner of the present application is provided. In this embodiment, after the step S20, the step S10 may be performed again until there is no risk of frost formation in the outdoor heat exchanger.

Specifically, after the opening degrees of the first throttling device 3 and the second throttling device 5 are adjusted, the frosting state parameter of the outdoor heat exchanger is obtained again, whether the frosting risk still exists in the outdoor heat exchanger after the opening degree adjustment is judged based on the obtained frosting state parameter of the outdoor heat exchanger, and the operation of the air conditioner is further controlled based on the judgment result.

Through the cyclic detection of the frosting state parameters and the response of the detection result, the opening degree of the first throttling device 3 and the opening degree of the second throttling device 5 can be gradually and slowly adjusted when the outdoor heat exchanger has the frosting risk, on one hand, the stability of the system operation can be ensured, on the other hand, the large fluctuation of the heat output by the indoor heat exchanger can be avoided, the stability of the indoor environment temperature can be ensured, and the comfortable requirement of a user can be ensured.

Based on this, in the present embodiment, referring to fig. 3, step S20 includes:

step S21, when the frosting risk of the outdoor heat exchanger is determined according to the frosting state parameters, updating a first target frequency;

and determining the times of frosting risks of the outdoor heat exchanger according to the frosting state parameters in the process of circularly acquiring the frosting state parameters.

Specifically, in the process of circularly obtaining the frosting state parameters, when the frosting risk of the outdoor heat exchanger is judged based on the frosting state parameters, the first target times are updated in real time, and the first target times can be increased once each time. Specifically, the value of the first target number of times may be initialized when the air conditioner starts heating operation or when the air conditioner is switched from a state in which the risk of frosting exists to a state in which the risk of frosting does not exist last time. For example, 0 may be initialized. In the heating operation process, when the frosting risk of the outdoor heat exchanger is judged based on the frosting state parameters for the first time, the first target frequency can be increased once, and the updated first target frequency is 1 time. And when the frosting risk of the outdoor heat exchanger is judged based on the frosting state parameters for the second time, the first target frequency is increased once on the basis of 1 time, the updated first target frequency is 2 times, and the like.

Step S22, determining a first opening degree adjustment value of the first throttle device 3 and a second opening degree adjustment value of the second throttle device 5 according to the first target number of times;

The first opening degree adjustment value may be an adjustment width or an adjustment ratio of the opening degree of the first throttle device 3. The second opening degree adjustment value may be an adjustment width or an adjustment ratio of the opening degree of the second throttle device 5.

The first corresponding relationship between the first target times and the first opening degree adjustment value may be preset, and may be in the form of a calculation relationship, a mapping relationship, an algorithm model, and the like, and based on the current first target times, the corresponding first opening degree adjustment value may be determined through the first corresponding relationship.

The second corresponding relationship between the first target times and the second opening degree adjustment value may be preset, and may be in the form of a calculation relationship, a mapping relationship, an algorithm model, and the like, and based on the current first target times, the corresponding second opening degree adjustment value may be determined through the second corresponding relationship.

For example, the first throttle device 3 may be preset with one opening degree adjustment range Δ L1, the second throttle device 5 may be preset with one opening degree adjustment range Δ L2, and the first target number of times is defined as N, the first opening degree adjustment value is N × Δ L1 each time the opening degree of the first throttle device 3 needs to be decreased, and the second opening degree adjustment value is N × Δ L2 each time the opening degree of the second throttle device 5 needs to be increased. Wherein Δ L1 and Δ L2 may be the same or different. Based on this, the opening degree of the first throttling device 3 may be decreased by Δ L1 when it is first detected that the outdoor heat exchanger is at risk of frosting, the opening degree of the second throttling device 5 may be increased by Δ L2, the opening degree of the first throttling device 3 may be decreased by 2 Δ L1 when it is second detected that the outdoor heat exchanger is at risk of frosting, the opening degree of the second throttling device 5 may be increased by 2 Δ L2, the opening degree of the first throttling device 3 may be decreased by 3 Δ L1 when it is third detected that the outdoor heat exchanger is at risk of frosting, the opening degree of the second throttling device 5 may be increased by 3 Δ L2, and so on.

Specifically, in the present embodiment, Δ L1> Δ L2, based on which the first opening degree adjustment value may be larger than the second opening degree adjustment value.

In step S23, the first throttle device 3 is controlled to decrease the opening degree according to the first opening degree adjustment value, and the second throttle device 5 is controlled to increase the opening degree according to the second opening degree adjustment value.

Specifically, if the first opening degree adjustment value is the adjustment range Δ L and the current opening degree of the first throttle device 3 is L, the opening degree of the first throttle device 3 is reduced to L- Δ L. The first opening degree adjustment value is the adjustment proportion a, and the current opening degree of the first throttling device 3 is L, the opening degree of the first throttling device 3 is reduced to L-a x L.

Specifically, if the second opening degree adjustment value is the adjustment range Δ L and the current opening degree of the second throttling device 5 is L, the opening degree of the second throttling device 5 is reduced to L- Δ L. And if the second opening degree adjustment value is the adjustment proportion a and the current opening degree of the second throttling device 5 is L, reducing the opening degree of the second throttling device 5 to L-a L.

In this embodiment, in the process of performing steps S10 and S20 in a circulating manner, the more the first target times, the longer the time length of the outdoor heat exchanger at the risk of frosting is, the more easily the frosting state occurs, and based on this, the more the first target times, the larger the adjustment values of the opening degrees of the first throttling device 3 and the second throttling device 5 are, which is beneficial to ensuring that the frosting state of the outdoor heat exchanger does not occur, further preventing the reliability of frosting of the outdoor heat exchanger, and ensuring that the air conditioner can continuously and stably perform the heating operation without being switched to the cooling operation.

In another embodiment, in the process of executing steps S10 and S20 in a loop, the first target number of times may not be used, but rather, the first opening degree adjustment value and the second opening degree adjustment value may be determined based on a duration from a time when the outdoor heat exchanger is first determined to be at risk of frosting to a time when the outdoor heat exchanger is currently determined to be at risk of frosting.

Further, in this embodiment, step S22 specifically includes:

step S221, acquiring an exhaust temperature of the compressor 1;

the exhaust temperature can be detected by a temperature detection module arranged at the exhaust port of the compressor 1.

Step S222, determining a target opening degree adjusting value according to the exhaust temperature;

different exhaust temperatures correspond to different target opening degree adjustment values. Specifically, the correspondence between the exhaust temperature and the target opening degree adjustment value may be set in advance, and may be a calculation relationship, a mapping relationship, an algorithm model, or the like. Based on the correspondence, a target opening degree adjustment value corresponding to the current exhaust temperature may be determined.

Specifically, in the present embodiment, the compressor 1 may be correspondingly set with a target discharge temperature based on the reliability requirement and the indoor heat exchange requirement thereof. Based on this, a temperature deviation between the current exhaust temperature and the target exhaust temperature may be determined, with different temperature deviations corresponding to different target opening adjustment values.

Step S223, determining a first reference opening degree adjustment value according to a first weight and the target opening degree adjustment value, and determining a second reference opening degree adjustment value according to a second weight and the target opening degree adjustment value;

the first weight and the second weight may be preset parameters, or may be obtained according to a magnitude relationship between the current exhaust temperature and the target exhaust temperature and/or the first target number of times. The different magnitude relationships correspond to different first weights and different second weights.

For example, if the first weight is a, the second weight is b, and the target opening degree adjustment value is M, the first reference opening degree adjustment value is a × M, and the second reference opening degree adjustment value is b × M.

Step S224, correcting the first reference opening degree adjustment value according to the first target number of times to obtain the first opening degree adjustment value, and correcting the second reference opening degree adjustment value according to the first target number of times to obtain the second opening degree adjustment value.

Specifically, a first correction value corresponding to the first throttle device 3 may be determined based on the first target number of times, and the result of correcting the first reference opening degree adjustment value by the first correction value may be used as the first opening degree adjustment value. For example, when the first correction value or the second correction value is a correction coefficient, a product of the first correction value and the first reference opening degree adjustment value may be used as the first opening degree adjustment value, and a product of the second correction value and the second reference opening degree adjustment value may be used as the second opening degree adjustment value; when the first correction value or the second correction value is the correction width, the sum or the perpendicular of the first correction value and the first reference opening degree adjustment value may be used as the first opening degree adjustment value, and the product of the second correction value and the second reference opening degree adjustment value may be used as the second opening degree adjustment value.

In the present embodiment, the above steps S221 to S224 ensure that the opening degree of the first throttle device 3 is decreased according to the determined first opening degree adjustment value, and after the opening degree of the second throttle device 5 is increased according to the determined second opening degree adjustment value, the discharge temperature of the compressor 1 is ensured to approach the target temperature, the output capacity of the compressor 1 is improved, and the effects of delaying defrosting of the outdoor heat exchanger and maintaining stable heat input into the room are further improved.

Further, based on any of the above embodiments, another embodiment of the heating control method of the air conditioner of the present application is provided. In the present embodiment, referring to fig. 4, step S20 includes:

step S201, controlling the first throttle device 3 to decrease the opening degree;

step S202, acquiring the pressure and temperature of the gas-liquid separator in the process of reducing the opening of the first throttling device 3;

in the process of reducing the opening degree of the first throttle device 3, the opening degree adjustment value may be determined according to the related refinement schemes in the above-mentioned step S21 to step S23, or may be adjusted according to a preset opening degree adjustment value. Here, the pressure of the gas-liquid separator and the temperature of the gas-liquid separator may be detected while the opening degree is being decreased, or may be detected after the first throttling device 3 completes one adjustment each time according to the opening degree adjustment value during the circulation.

Step S203 of controlling the second throttle device 5 to increase the opening degree when the pressure of the gas-liquid separator reaches a target pressure and the temperature of the gas-liquid separator reaches a target temperature;

the target pressure is specifically a target value which is required to be reached by the pressure of the gas-liquid separator when the refrigerant enters the gas-liquid separator and can be separated to obtain a saturated gaseous refrigerant and a saturated liquid refrigerant. The target temperature is the saturation temperature of the refrigerant in the gas-liquid separator under the target pressure.

Wherein the target pressure is determined according to the discharge pressure and the return pressure of the compressor 1, and the target temperature is determined according to the target pressure. In the present embodiment, the target pressure is specifically the product of the exhaust pressure and the return pressure at root. In other embodiments, the exhaust pressure, the return pressure, and the target pressure may also be set to other pressures according to actual requirements.

The gas-liquid separator pressure reaching the target pressure here specifically means that a pressure deviation of the gas-liquid separator pressure from the target pressure is smaller than a set pressure threshold. The gas-liquid separator temperature reaching the target temperature here specifically means that the temperature deviation of the gas-liquid separator temperature from the target temperature is smaller than a set temperature threshold.

In this embodiment, the opening degree of the first throttling device 3 is reduced, then, the gas refrigerant and the liquid refrigerant separated by the gas-liquid separator reach a saturated state, and then, the opening degree of the second throttling device 5 is further increased, the saturated refrigerant separated by the gas-liquid separator can ensure an enthalpy increasing effect achieved by matching of the gas-liquid separator and the independent compression, on the basis, the opening degree of the second throttling device 5 is increased, the enthalpy loss caused by the fact that the temperature of the refrigerant entering the outdoor heat exchanger is increased after the opening degree of the second throttling device 5 is adjusted can be compensated by matching of the independent compression and the gas-liquid separator, the indoor heat exchanger can maintain stable heat input to the indoor environment while the frosting of the outdoor heat exchanger is prevented, the temperature fluctuation of the indoor environment is avoided, and the comfort of indoor users is improved.

Further, based on any of the above embodiments, a heating control method of an air conditioner according to the present application is further provided. In this embodiment, referring to fig. 5, the step S20, when executed simultaneously or after the step S20 is executed, further includes:

and step S30, increasing the rotating speed of the outdoor fan 9 of the air conditioner, and/or reducing the rotating speed of the indoor fan 8 of the air conditioner.

Specifically, the rotating speed of the indoor fan 8 and/or the rotating speed of the outdoor fan 9 may be adjusted according to a preset fixed adjustment parameter, or may be adjusted based on an adjustment parameter determined by an actual operation condition of the air conditioner. The indoor fan 8 and the outdoor fan 9 can be adjusted according to the same adjustment parameter, and can also be adjusted according to different adjustment parameters.

The rotating speed of the indoor fan 8 and the rotating speed of the outdoor fan 9 can be adjusted at one time or adjusted step by step for many times. When the rotating speed of the indoor fan 8 and the rotating speed of the outdoor fan 9 are adjusted for multiple times, the parameters of each rotating speed adjustment can be the same or different.

It should be noted that the adjustment parameters herein specifically include a rotation speed adjustment amplitude and/or a rotation speed adjustment rate, and the like.

The reduction of the rotating speed corresponding to the indoor fan 8 and the increase of the rotating speed corresponding to the outdoor fan 9 can be executed simultaneously or sequentially according to actual requirements. Specifically, the rotation speed of the indoor fan 8 may be reduced first, and then the rotation speed of the outdoor fan 9 may be increased, or the rotation speed of the outdoor fan 9 may be increased first, and then the rotation speed of the indoor fan 8 may be reduced.

In the process of cyclically executing steps S10 and S20, step S30, i.e., steps S10 to S30, can be cyclically executed synchronously, so that the effects of preventing frosting and maintaining the indoor ambient temperature of the air conditioner can be further improved.

Here, the increase of the rotating speed of the outdoor fan 9 can improve the heat exchange efficiency of the outdoor heat exchanger, so that the cold quantity of the outdoor heat exchanger is rapidly dissipated, and the frosting risk of the outdoor heat exchanger is further reduced. The reduction of the rotating speed of the indoor fan 8 can reduce the heat exchange efficiency of the indoor heat exchanger, and ensure that the temperature of the air supplied to the room by the air conditioner does not change even if the enthalpy value of the refrigerant flowing through the indoor heat exchanger is reduced in the process of delaying the frosting of the air conditioner based on the step S10 and the step S20, thereby further avoiding the fluctuation of the indoor environment temperature.

Specifically, in this embodiment, step S30 includes:

step S31, when the frosting risk of the outdoor heat exchanger is determined according to the frosting state parameters, updating a second target frequency;

Specifically, in the process of circularly obtaining the frosting state parameters, when the frosting risk of the outdoor heat exchanger is judged based on the frosting state parameters, the second target times are updated in real time, and the second target times can be increased once each time. Specifically, the value of the second target number may be initialized when the air conditioner starts heating operation or when the air conditioner is switched from a state in which the risk of frosting exists to a state in which the risk of frosting does not exist last time. For example, 0 may be initialized. In the heating operation process, when the frosting risk of the outdoor heat exchanger is judged based on the frosting state parameters for the first time, the second target frequency can be increased once, and the updated second target frequency is 1 time. And when the frosting risk of the outdoor heat exchanger is judged based on the frosting state parameters for the second time, the second target frequency is increased once on the basis of 1 time, the updated second target frequency is 2 times, and the like.

Note that, when step S20 and step S30 are executed in synchronization, the second target count here refers to the same concept as the first target count described above.

Step S32, determining a first rotation speed adjusting value and/or a second rotation speed adjusting value according to the second target times;

The first rotation speed adjustment value may be an adjustment range or an adjustment ratio of the rotation speed of the outdoor fan 9. The second rotation speed adjustment value may be an adjustment range or an adjustment ratio of the rotation speed of the indoor fan 8.

The third corresponding relationship between the second target times and the first rotation speed adjustment value may be preset, and may be in the form of a calculation relationship, a mapping relationship, an algorithm model, and the like.

The fourth corresponding relationship between the second target frequency and the second rotation speed adjustment value may be preset, and may be in the form of a calculation relationship, a mapping relationship, an algorithm model, and the like, and based on the current second target frequency, the corresponding second rotation speed adjustment value may be determined through the fourth corresponding relationship.

For example, the outdoor fan 9 may be preset with a rotation speed adjustment range Δ N1, the indoor fan 8 may be preset with a rotation speed adjustment range Δ N2, and the second target number of times is defined as k, so that the first rotation speed adjustment value is k × Δ N1 each time the rotation speed of the outdoor fan 9 needs to be increased, and the second rotation speed adjustment value is k × Δ N2 each time the rotation speed of the indoor fan 8 needs to be decreased. Wherein Δ N1 and Δ N2 may be the same or different. Based on this, the rotation speed of the outdoor fan 9 may be increased by Δ N1 when it is detected that the outdoor heat exchanger is at risk of frosting for the first time, the rotation speed of the indoor fan 8 may be decreased by Δ N2, the rotation speed of the outdoor fan 9 may be increased by 2 Δ N1 when it is detected that the outdoor heat exchanger is at risk of frosting for the second time, the rotation speed of the indoor fan 8 may be decreased by 2 Δ N2, the rotation speed of the outdoor fan 9 may be increased by 3 Δ N1 when it is detected that the outdoor heat exchanger is at risk of frosting for the third time, the rotation speed of the indoor fan 8 may be decreased by 3 Δ N2. Specifically, in the present embodiment, Δ N1> Δ N2, based on which the first rotational speed adjustment value may be greater than the second rotational speed adjustment value.

And step S33, controlling the outdoor fan 9 to operate at the first rotation speed adjustment value to increase the rotation speed, and/or controlling the indoor fan 8 to operate at the second rotation speed adjustment value to decrease the rotation speed.

In this embodiment, in the process of cyclically executing steps S10 and S20, the more the second target times, the longer the outdoor heat exchanger is in the risk of frosting, the more easily the frosting state occurs, and based on this, the more the second target times, the larger the adjustment value of the rotation speed corresponding to the indoor and outdoor fans is, which is beneficial to ensuring that the frosting state does not occur in the outdoor heat exchanger, further preventing the reliability of frosting of the outdoor heat exchanger, and also beneficial to the stability of the indoor temperature, and ensuring the sustainable and stable heating operation of the air conditioner without switching to the cooling operation.

In other embodiments, the first rotation speed adjustment value and the second rotation speed adjustment value may be determined based on a duration from a time when the outdoor heat exchanger is first determined to be at risk of frosting to a time when the outdoor heat exchanger is currently determined to be at risk of frosting, instead of the second target number, during the loop execution of steps S10, S20, and S30.

In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a heating control program of an air conditioner is stored on the computer-readable storage medium, and when the heating control program of the air conditioner is executed by a processor, the relevant steps of any embodiment of the above heating control method of the air conditioner are implemented.

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 phrase "comprising an … …" does not exclude the presence of other 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 may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., 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 not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A heating control method of an air conditioner is characterized in that the air conditioner comprises a compressor, an indoor heat exchanger, a first throttling device, a gas-liquid separator, a second throttling device and an outdoor heat exchanger which are sequentially connected to form a refrigerant circulation loop, the compressor comprises a first compression cylinder and a second compression cylinder which are mutually independent, the gas-liquid separator is provided with a refrigerant inlet, a liquid phase outlet and a gas phase outlet, one end of the first compression cylinder is communicated with the outdoor heat exchanger, the other end of the first compression cylinder is communicated with the indoor heat exchanger, one end of the second compression cylinder is communicated with the gas phase outlet, the other end of the second compression cylinder is communicated with the indoor heat exchanger, the gas-liquid separator is communicated with the first throttling device through the refrigerant inlet, and the gas-liquid separator is communicated with the second throttling device through the liquid phase outlet, the heating control method of the air conditioner comprises the following steps:

2. The heating control method of an air conditioner according to claim 1, wherein after the step of controlling the first throttling means to decrease the opening degree so that the temperature of the indoor heat exchanger of the air conditioner is greater than a set heat exchanger temperature, and controlling the second throttling means to increase the opening degree so that the temperature of the outdoor heat exchanger is increased, the method further comprises:

3. A heating control method of an air conditioner according to claim 2, wherein the step of controlling the first throttling means to decrease the opening degree so that the temperature of the indoor heat exchanger of the air conditioner is greater than a set heat exchanger temperature, and the step of controlling the second throttling means to increase the opening degree so that the temperature of the outdoor heat exchanger is increased comprises:

4. The heating control method of an air conditioner according to claim 3, wherein the step of determining a first opening degree adjustment value of the first throttle device and a second opening degree adjustment value of the second throttle device according to the first target number of times includes:

acquiring the exhaust temperature of the compressor;

5. The heating control method of an air conditioner according to claim 1, wherein the step of controlling the first throttling means to decrease the opening degree so that the temperature of the indoor heat exchanger of the air conditioner is greater than a set heat exchanger temperature, and the step of controlling the second throttling means to increase the opening degree so that the temperature of the outdoor heat exchanger is increased comprises:

6. The heating control method of an air conditioner according to claim 2, wherein said controlling the first throttling means to decrease the opening degree so that the temperature of the indoor heat exchanger of the air conditioner is higher than a set heat exchanger temperature and controlling the second throttling means to increase the opening degree so that the temperature of the outdoor heat exchanger is increased, simultaneously with or after the step of controlling the first throttling means to decrease the opening degree, further comprises:

7. The heating control method of the air conditioner according to claim 6, wherein the step of increasing the rotation speed of an outdoor fan of the air conditioner and/or decreasing the rotation speed of an indoor fan of the air conditioner comprises:

8. The heating control method of the air conditioner according to any one of claims 1 to 7, wherein a refrigerant port of the outdoor heat exchanger at an end close to the second throttling device is defined as a target position, and the frosting condition parameter is a temperature parameter of the target position.

9. The heating control method of an air conditioner according to claim 8, wherein the temperature parameters include a current temperature value of the target location and a temperature variation trend of the target location, and after the step of obtaining the frosting condition parameter of the outdoor heat exchanger, further comprising:

10. An air conditioner is characterized by comprising a control device, a compressor, an indoor heat exchanger, a first throttling device, a gas-liquid separator, a second throttling device and an outdoor heat exchanger which are connected to form a refrigerant circulating loop, the compressor comprises a first compression cylinder and a second compression cylinder which are mutually independent, the gas-liquid separator is provided with a refrigerant inlet, a liquid phase outlet and a gas phase outlet, one end of the first compression cylinder is communicated with the outdoor heat exchanger, the other end of the first compression cylinder is communicated with the indoor heat exchanger, one end of the second compression cylinder is communicated with the gas phase outlet, the other end of the second compression cylinder is communicated with the indoor heat exchanger, the gas-liquid separator is communicated with the first throttling device through the refrigerant inlet, and the gas-liquid separator is communicated with the second throttling device through the liquid phase outlet;

wherein the first throttling device and the second throttling device are both connected with the control device, and the control device comprises: a memory, a processor and a heating control program of an air conditioner stored on the memory and operable on the processor, the heating control program of the air conditioner implementing the steps of the heating control method of the air conditioner as claimed in any one of claims 1 to 9 when executed by the processor.

11. A computer-readable storage medium, wherein a heating control program of an air conditioner is stored on the computer-readable storage medium, and when executed by a processor, the heating control program of the air conditioner implements the steps of the heating control method of the air conditioner according to any one of claims 1 to 9.