CN110160231B

CN110160231B - Valve control method, indoor unit, and computer-readable storage medium

Info

Publication number: CN110160231B
Application number: CN201910458207.6A
Authority: CN
Inventors: 冯明坤; 熊美兵; 王新利
Original assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2021-11-30
Anticipated expiration: 2039-05-29
Also published as: CN110160231A

Abstract

The invention provides a valve body control method, an indoor unit and a computer readable storage medium, wherein the valve body control method comprises the following steps: acquiring the return air temperature and the set temperature of the indoor unit; determining a first temperature difference between the return air temperature and the set temperature; determining a second temperature difference value between the set temperature and the temperature of the heat exchanger pipe of the indoor unit according to the first temperature difference value; and controlling the opening degree of an electronic expansion valve in the indoor unit according to the second temperature difference value. According to the technical scheme, the refrigerant distribution of the indoor unit can be accurately controlled, the refrigerant distribution of the indoor unit is more uniform, the working efficiency of the indoor unit is improved, electric energy is saved, and in addition, the indoor unit provides air supply with uniformly-changed temperature, so that more comfortable use experience is brought to users.

Description

Valve control method, indoor unit, and computer-readable storage medium

Technical Field

The invention relates to the technical field of air conditioners, in particular to a valve body control method, an indoor unit and a computer readable storage medium.

Background

Along with the improvement of the quality of life of people, more and more attention is paid to the regulation of indoor environment, particularly under cold or extremely hot environment, the indoor temperature needs to be regulated, the air conditioner has been widely used by ordinary families with the characteristics of energy conservation, flexible control, convenient installation and the like, but along with the improvement of the energy-saving consciousness of people, higher requirements are provided for the energy conservation and the high-efficiency operation of the air conditioner. At present, the opening of an electronic expansion valve is adjusted by a common air conditioning system through the pipe temperature, however, the above method cannot correctly identify the refrigerant requirement of an indoor unit, the operation efficiency is low, and unnecessary electric energy loss is caused.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

In view of the above, an object of the present invention is to provide a valve body control method.

The invention further aims to provide an indoor unit correspondingly.

It is still another object of the present invention to provide a computer-readable storage medium.

In order to achieve at least one of the above objects, a first aspect of the present invention provides a valve body control method, including: acquiring the return air temperature and the set temperature of the indoor unit; determining a first temperature difference between the return air temperature and the set temperature; determining a second temperature difference value between the set temperature and the temperature of the heat exchanger pipe of the indoor unit according to the first temperature difference value; and controlling the opening degree of an electronic expansion valve in the indoor unit according to the second temperature difference value.

According to the valve body control method provided by the invention, the working requirement of the air conditioner is determined by acquiring the return air temperature and the set temperature of the indoor unit and determining the first temperature difference value between the return air temperature and the set temperature, and particularly, when the difference value between the return air temperature and the set temperature is larger, the heat exchange quantity between the heat exchanger of the air conditioner and the indoor air is larger, so that the compressor is required to provide larger refrigerant quantity to quickly change the indoor temperature. When the difference between the return air temperature and the set temperature is small, the indoor temperature is required to reach the set temperature, and the heat exchange quantity between the air conditioner heat exchanger and the indoor air is small, so that the compressor can meet the heat exchange requirement by providing a small amount of refrigerant to change the indoor temperature, and the compressor can meet the requirement of a user by running with small power. When a second temperature difference value between the set temperature and the pipe temperature of the heat exchanger of the indoor unit is determined according to the first temperature difference value, if the first temperature difference value is larger, the fact that the requirement of heat exchange of the required air conditioner is stronger is indicated, meanwhile, the second temperature difference value corresponding to the heat exchange requirement is determined, so that the subsequent input of the quantity of refrigerants meeting the specific use requirement of a user according to the second temperature difference value is facilitated, specifically, when the first temperature difference value is larger, if the calculated second temperature difference value is smaller, the fact that the difference value between the pipe temperature of the heat exchanger and the set temperature is small is indicated, at this moment, the fact that the heat exchange quantity of the heat exchanger meets the requirement of the user and needs to meet the energy-saving requirement preferentially is indicated, if the calculated second temperature difference value is larger, the fact that the difference value between the pipe temperature of the heat exchanger and the set temperature is larger, and the current refrigerant quantity is not enough to meet the requirement of refrigerating or heating refrigerants and still needs to be supplied in a larger quantity, and the whole, the second temperature difference is determined according to the first temperature difference, energy conservation or heat exchange of the air conditioner can be controlled according to specific use environments, and therefore unnecessary energy waste is reduced.

The opening of the electronic expansion valve is controlled according to the difference value between the set temperature and the tube temperature of the heat exchanger, so that the refrigerant quantity of the indoor unit is reasonably distributed, and electric energy is saved. Specifically, when the temperature difference value between the set temperature and the heat exchanger tube temperature is too large, the amount of the refrigerant distributed to the heat exchanger is too large, and the supply amount of the refrigerant is reduced by reducing the opening degree of the electronic expansion valve, so that the supply of the refrigerant is accurately distributed, and the electric energy is saved; when the difference value between the set temperature and the temperature of the heat exchanger pipe is too small, the quantity of the refrigerant distributed to the heat exchanger is too small, the supply quantity of the refrigerant is increased by increasing the opening of the electronic expansion valve, so that the heat exchange efficiency is improved, the indoor temperature is changed, and the user requirements are met. Understandably, in the continuous working process of the air conditioner, the return air temperature and the heat exchanger tube temperature are changed according to different use environments and use requirements, so that the difference value between the return air temperature and the set temperature and the difference value between the set temperature and the heat exchanger tube temperature are also changed, the opening degree of the electronic expansion valve is changed along with the change of the difference value between the set temperature and the heat exchanger tube temperature, on one hand, the automatic control of the air conditioner on the electronic expansion valve is realized, and the operation of a user is convenient; on the other hand, the change of the opening of the electronic expansion valve enables the refrigerant distribution to change, so that the compressor always distributes a proper amount of refrigerant to the indoor unit, the heat exchange efficiency of the heat exchanger is further adjusted, the air supply temperature of the air conditioner is gradually changed along with the change of the indoor temperature, the overlarge temperature difference between the air supply temperature and the room temperature is avoided, and the comfort level of a user is improved.

In addition, the valve body control method in the above embodiment provided by the present invention may further have the following technical features:

in the above technical solution, determining a second temperature difference between the set temperature and a heat exchanger tube temperature of the indoor unit according to the first temperature difference specifically includes: determining the demand degree corresponding to the indoor unit according to the first temperature difference value; and determining a second temperature difference range corresponding to the second temperature difference value according to the demand degree.

In the technical scheme, the demand degree corresponding to the indoor unit is determined through the first temperature difference, namely the demand degree of the indoor unit is determined through the difference between the return air temperature and the set temperature or the difference between the set temperature and the return air temperature, the different return air temperatures and the set temperature correspond to different demand degrees of the indoor unit, and when the difference between the return air temperature and the set temperature is larger, the demand degree can be determined to be a high demand degree; when the difference between the return air temperature and the set temperature is small, the degree of demand can be determined to be a low degree of demand. And determining a corresponding second temperature difference range according to the demand degree and the second temperature difference, so that different indoor unit demand degrees can correspond to different second temperature difference ranges, and the control of the air conditioner electronic expansion valve is more precise and accurate.

Specifically, when the first temperature difference value is large, the heat exchange demand of a heat exchanger and indoor air in the indoor unit is large, and the compressor needs to supply more refrigerants to the heat exchanger, so that the demand degree of the indoor unit is considered to be high, and according to the high demand degree of the indoor unit, a second temperature difference range corresponding to the high demand degree of the indoor unit is determined, so that the air conditioner controls the opening degree of the electronic expansion valve according to the second temperature difference value and the second temperature difference range, and the compressor supplies the refrigerant amount corresponding to the demand degree of the indoor unit to the indoor unit, so that the indoor temperature is changed rapidly, and the user demand is met; when the first temperature difference value is smaller, the heat exchange demand of the heat exchanger and indoor air in the indoor unit is smaller, and the compressor supplies the refrigerant with less heat exchanger to meet the heat exchange requirement, so that the demand degree of the indoor unit can be considered to be lower, and the second temperature difference range corresponding to the indoor unit is determined according to the low demand degree of the indoor unit, so that the air conditioner controls the opening degree of the electronic expansion valve according to the second temperature difference value and the second temperature difference range, the compressor supplies the refrigerant quantity corresponding to the demand degree of the indoor unit to the indoor unit, the small-range adjustment refrigerant supply quantity is realized under the condition of meeting the user demand, the refrigerant distribution is optimized, and the electric energy is saved.

In the above technical solution, determining a demand level corresponding to the indoor unit according to the first temperature difference specifically includes: if the first temperature difference value is within the first temperature difference range, the demand degree is a medium demand degree; if the first temperature difference value is smaller than the lower limit threshold of the first temperature difference range, the demand degree is a low demand degree; if the first temperature difference value is greater than the upper threshold of the first temperature difference range, the demand level is a high demand level.

In the technical scheme, different first temperature difference values correspond to different demand degrees of the indoor unit, a first temperature difference range is determined, the demand degree of the indoor unit is determined according to the comparison relation between the first temperature difference value and the first temperature difference range, and when the first temperature difference value is within the first temperature difference range, the demand degree of the indoor unit is moderate, so that the demand degree is determined to be a medium demand degree; when the first temperature difference is smaller than the lower limit threshold of the first temperature difference range, the first temperature difference is smaller, the indoor unit demand degree is lower, and therefore the demand degree is determined to be the low demand degree; when the first temperature difference value is larger than the upper limit threshold of the first temperature difference range, the first temperature difference value is larger, the indoor unit demand degree is higher, and therefore the demand degree is determined to be the high demand degree. The demand degree of the indoor unit is set to be the medium demand degree, the low demand degree and the high demand degree according to the first temperature difference value, so that the air conditioner can adopt different control modes for the electronic expansion valve under the demands of the indoor unit with different degrees respectively, the refrigerant quantity distributed to the indoor unit is controlled appropriately, and the high-efficiency operation of the air conditioner is realized.

Wherein, according to the air conditioner of different areas, different climates or different models can set up different first difference in temperature scope, specifically, in hotter, colder area or the great area of difference in temperature round the clock, the user is at the in-process that uses the air conditioner, return air temperature and settlement temperature difference are great, can be suitable the great first difference in temperature scope of settlement this moment, make when return air temperature is close to the settlement temperature, can be in great first difference in temperature scope, it is moderate to confirm indoor set demand degree, reduce the frequent control to electronic expansion valve, make the air conditioner keep more stable power output, reduce the loss of air conditioner, and practice thrift the electric energy.

In the above technical solution, controlling an opening degree of an electronic expansion valve in an indoor unit according to the second temperature difference specifically includes: when the second temperature difference value is within the second temperature difference range, keeping the opening degree of the electronic expansion valve unchanged; when the second temperature difference value is smaller than the lower limit threshold value of the second temperature difference range, controlling the opening degree of the electronic expansion valve to increase; and when the second temperature difference value is larger than the upper limit threshold value of the second temperature difference range, controlling the opening degree of the electronic expansion valve to be reduced.

In the technical scheme, the opening degree of the electronic expansion valve is controlled according to the second temperature difference value, the second temperature difference range is determined, when the second temperature difference value is in the second temperature difference range, the opening degree of the electronic expansion valve is kept unchanged, the quantity of refrigerant supplied to an indoor unit is unchanged at the moment, the power operation of the indoor unit is unchanged, the indoor temperature is uniformly changed, and the electric energy is saved under the condition of meeting the requirements of customers; when the second temperature difference value is smaller than the lower limit threshold value of the second temperature difference range, the refrigerant quantity in the heat exchanger of the indoor unit is considered to be too small, the opening degree of the electronic expansion valve is controlled to be increased, so that the refrigerant quantity supplied to the indoor unit is increased, the heat exchange efficiency of the heat exchanger of the indoor unit and indoor air is improved, and the indoor temperature is changed rapidly to meet the requirements of customers; when the second temperature difference value is larger than the upper limit threshold value of the second temperature difference range, the refrigerant quantity in the heat exchanger of the indoor unit is considered to be excessive, the opening degree of the electronic expansion valve is controlled to be reduced, so that the refrigerant quantity supplied by the indoor unit is reduced, a proper amount of refrigerant is supplied to the heat exchanger of the indoor unit to exchange heat with indoor air, more comfortable air supply is provided for users, the distribution of the refrigerant is controlled finely, the running frequency of the compressor is reduced, and electric energy is effectively saved.

In the technical scheme, the upper limit threshold of the second temperature difference range with the high demand degree is larger than the upper limit threshold of the second temperature difference range with the medium demand degree, and the upper limit threshold of the second temperature difference range with the medium demand degree is larger than the upper limit threshold of the second temperature difference range with the low demand degree; the lower threshold of the second temperature difference range with the high demand degree is larger than that of the second temperature difference range with the medium demand degree, and the lower threshold of the second temperature difference range with the medium demand degree is larger than that of the second temperature difference range with the low demand degree.

In this technical solution, when the demand levels of the indoor units are different, the second temperature difference ranges corresponding to the demand levels are also different, specifically, if the high demand level second temperature difference range is (Ah, Bh), the medium demand level second temperature difference range is (Am, Bm), and the low demand level second temperature difference range is (Al, Bl), then Ah > Am > Al, and Bh > Bm > Bl, where Ah, Am, Al, Bh, Bm, Bl are constants.

Understandably, from low demand degree to high demand degree, the second temperature difference range of three different demand degrees is in a step-shaped progressive increase, so according to the control of the opening degree of the electronic expansion valve by the second temperature difference value and the second temperature difference range, the supply amount of the refrigerant can be adjusted step by step to optimize the distribution of the refrigerant.

Specifically, when the high demand degree of the indoor unit is higher, the temperature difference between the return air temperature and the set temperature is larger, in order to quickly meet the requirement of changing the indoor temperature of a user, the compressor supplies a larger amount of refrigerant to the heat exchanger of the indoor unit so as to improve the heat exchange efficiency between the heat exchanger and air, meanwhile, because the amount of refrigerant in the heat exchanger is larger, the temperature difference between the set temperature and the pipe temperature of the heat exchanger is larger in the heat exchange process, when the temperature difference between the set temperature and the pipe temperature of the heat exchanger is larger than the upper limit threshold value of the second temperature difference range of the high demand degree, the opening degree of the electronic expansion valve is controlled to be reduced so as to reduce the supply amount of refrigerant to the indoor unit, so that the difference between the set temperature and the pipe temperature of the heat exchanger is reduced, when the difference between the return air temperature and the set temperature is reduced to be within the first temperature difference range after the air conditioner works for a period of time, the demand degree of the indoor unit is the medium demand degree, and when the difference between the set temperature and the pipe temperature is larger than the upper limit threshold value of the second temperature difference of the medium demand degree, the electronic expansion valve is controlled to be reduced again, so that the refrigerant supply quantity of the indoor unit is further adjusted, the gradual adjustment of the refrigerant quantity is realized, the refrigerant distribution accuracy is improved, and the electric energy is saved.

In the technical scheme, when the demand degree is a high demand degree, the opening degree of the electronic expansion valve is reduced by a first amplitude, and the opening degree of the electronic expansion valve is increased by a second amplitude; when the demand degree is the medium demand degree, the reduction amplitude of the opening degree of the electronic expansion valve is the same as the increase amplitude of the opening degree of the electronic expansion valve, and the reduction amplitude and the increase amplitude are both first amplitudes; when the demand level is a low demand level, the opening degree of the electronic expansion valve is decreased by a second margin and the opening degree of the electronic expansion valve is increased by a first margin, wherein the first margin is smaller than the second margin.

In the technical scheme, when the demand degree of the indoor unit is the medium demand degree, the reduction amplitude of the opening of the electronic expansion valve and the increase amplitude of the opening of the electronic expansion valve are both first amplitudes, so that the increased or decreased refrigerant quantity is equal after the opening of the electronic expansion valve is controlled to change when the demand degree of the air conditioner is the medium demand degree, the indoor unit obtains more stable refrigerant quantity, the air supply temperature is uniformly changed, and the use comfort level of a user is improved. When the demand degree of the indoor unit is high demand degree, if the second temperature difference value is smaller than the lower limit threshold value of the second temperature difference range, because a user urgently needs to change the indoor temperature, the opening of the electronic expansion valve is controlled to increase the second amplitude, more refrigerants can be supplied to the indoor unit, the second temperature difference value is increased, the heat exchange efficiency of a heat exchanger of the indoor unit and indoor air is improved, so that the indoor temperature is quickly changed, when the second temperature difference value is larger than the upper limit threshold value of the second temperature difference range, the opening of the electronic expansion valve is reduced by the first amplitude to reduce the supply amount of the refrigerants, so that the second temperature difference value is reduced by the supply amount of the refrigerants which is smaller than the supply amount of the refrigerants which is increased, so that the reduction range of the second temperature difference value is smaller than the increase range of the second temperature difference value, and the second temperature difference value is in the second temperature difference range through one or a plurality of times of adjustment, the heat exchange efficiency of the heat exchanger of the indoor unit and indoor air is in a proper range, more comfortable air supply is provided under the condition of meeting the user demand, and the optimal distribution of the supply refrigerant quantity under the high demand degree is realized by adjusting the opening degree of the electronic expansion valve for many times, so that the electric energy is saved. When the demand degree of the indoor unit is low demand degree, the difference value between the indoor temperature and the set temperature is smaller, the user demand mainly comprises that the indoor temperature is properly changed, if the second temperature difference value is smaller than the lower limit threshold value of the second temperature difference range, the opening of the electronic expansion valve is controlled to increase the first amplitude, the supply quantity of the refrigerant is properly increased through the electronic expansion valve, the second temperature difference value is increased, the heat exchange efficiency between a heat exchanger of the indoor unit and the indoor air is improved, the indoor temperature is properly changed, when the second temperature difference value is larger than the upper limit threshold value of the second temperature difference range, the opening of the electronic expansion valve is reduced by the second amplitude, the supply quantity of the refrigerant is reduced, the supply quantity of the refrigerant is larger than the increased supply quantity of the refrigerant, and the reduction amplitude of the second temperature difference value is larger than the increased amplitude of the second temperature difference value, through once or many times of adjustment, make the second temperature difference be in the second difference in temperature within range, and be close to the lower limit threshold value of second difference in temperature scope to under the condition that satisfies user's demand, supply with lower refrigerant volume, in order to practice thrift the electric energy.

In the above technical solution, before determining the first temperature difference between the return air temperature and the set temperature, the method further includes: determining an operation mode of an indoor unit; when the operation mode is the cooling mode, the first temperature difference is the difference between the return air temperature and the set temperature, and when the operation mode is the heating mode, the first temperature difference is the difference between the set temperature and the return air temperature.

In the technical scheme, the air conditioner is set with a refrigeration mode and a heating mode, when the operation mode is the refrigeration mode, the indoor temperature is higher than the set temperature of a user, namely the return air temperature is higher than the set temperature, and therefore, the first temperature difference is the difference between the return air temperature and the set temperature; when the operation mode is the heating mode, the indoor temperature is lower than the set temperature, namely the return air temperature is lower than the set temperature, so that the first temperature difference is the difference between the set temperature and the return air temperature.

In the above technical solution, determining a second temperature difference between the set temperature and a temperature of a heat exchanger tube of the indoor unit specifically includes: when the operation mode is a refrigeration mode, the second temperature difference is the difference between the set temperature and the temperature of the heat exchanger tube; when the operation mode is the heating mode, the second temperature difference is the difference between the tube temperature of the heat exchanger and the set temperature.

In the technical scheme, when the operation mode is the refrigeration mode, the set temperature is less than the temperature of the heat exchanger tube, so that the second temperature difference is the difference between the set temperature and the temperature of the heat exchanger tube, and when the refrigeration function of the air conditioner is started, the opening degree of the electronic expansion valve is controlled according to the difference between the set temperature and the temperature of the heat exchanger tube, so that the refrigerant is distributed. When the operation mode is the heating mode, the set temperature is greater than the temperature of the heat exchanger tube, therefore, the second temperature difference is the difference between the temperature of the heat exchanger tube and the set temperature, and when the air conditioner starts the heating function, the opening degree of the electronic expansion valve is controlled according to the difference between the temperature of the heat exchanger tube and the set temperature, so that the refrigerant is distributed.

According to a second aspect of the present invention, there is provided an indoor unit, configured to implement the valve body control method according to any one of the above first aspect, where the indoor unit includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor implements the steps of the valve body control method according to any one of the above first aspect when executing the computer program, so that the technical effects of any one of the above first aspect are achieved, and are not described herein again.

A third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of any of the above valve body control methods, so that the technical effects of any of the above technical solutions of the first aspect are achieved, and details are not repeated herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 shows a schematic flow diagram of a valve body control method according to an embodiment of the invention;

FIG. 2 shows a schematic flow diagram of a valve body control method according to an embodiment of the invention;

FIG. 3 shows a flow diagram of a valve body control method according to an embodiment of the invention;

FIG. 4 shows a flow diagram of a valve body control method according to an embodiment of the invention;

FIG. 5 illustrates a flow diagram of a valve body control method at medium demand in accordance with one embodiment of the present invention;

FIG. 6 illustrates a flow diagram of a low demand level valve body control method according to one embodiment of the present invention;

FIG. 7 illustrates a flow diagram of a valve body control method at high demand levels according to one embodiment of the present invention;

FIG. 8 shows a flow diagram of a valve body control method according to an embodiment of the invention;

FIG. 9 is a flow chart diagram illustrating a valve body control method in a cooling mode according to one embodiment of the present invention;

fig. 10 shows a schematic view of a valve body control method in a heating mode according to an embodiment of the invention.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Some embodiments according to the invention are described below with reference to fig. 1 to 10.

As shown in fig. 1, an embodiment of the present invention provides a valve body control method, including: step S102, obtaining the return air temperature and the set temperature of the indoor unit; step S104, determining a first temperature difference value between the return air temperature and the set temperature; step S106, determining a second temperature difference value between the set temperature and the temperature of the heat exchanger pipe of the indoor unit according to the first temperature difference value; step S108, controlling the opening degree of an electronic expansion valve in the indoor unit according to the second temperature difference, which specifically comprises the following steps:

specifically, through the return air temperature and the set temperature who acquire the indoor set to confirm the first temperature difference of return air temperature and set temperature, thereby confirm the work demand of air conditioner, specifically, when the difference of return air temperature and set temperature is great, make the heat transfer volume of air conditioner heat exchanger and room air great, consequently, need the compressor to provide great refrigerant volume, with the quick change room temperature, understandably, the heat transfer volume demand of indoor set heat exchanger and room air is great this moment, it runs with great frequency to need the compressor. When the difference between the return air temperature and the set temperature is small, the indoor temperature is required to reach the set temperature, and the heat exchange quantity between the air conditioner heat exchanger and the indoor air is small, so that the compressor can meet the heat exchange requirement by providing a small amount of refrigerant to change the indoor temperature, and the compressor can meet the requirement of a user by running with small power. When a second temperature difference value between the set temperature and the pipe temperature of the heat exchanger of the indoor unit is determined according to the first temperature difference value, if the first temperature difference value is larger, the fact that the requirement of heat exchange of the required air conditioner is stronger is indicated, meanwhile, the second temperature difference value corresponding to the heat exchange requirement is determined, so that the subsequent input of the quantity of refrigerants meeting the specific use requirement of a user according to the second temperature difference value is facilitated, specifically, when the first temperature difference value is larger, if the calculated second temperature difference value is smaller, the fact that the difference value between the pipe temperature of the heat exchanger and the set temperature is small is indicated, at this moment, the fact that the heat exchange quantity of the heat exchanger meets the requirement of the user and needs to meet the energy-saving requirement preferentially is indicated, if the calculated second temperature difference value is larger, the fact that the difference value between the pipe temperature of the heat exchanger and the set temperature is larger, and the current refrigerant quantity is not enough to meet the requirement of refrigerating or heating refrigerants and still needs to be supplied in a larger quantity, and the whole, the second temperature difference is determined according to the first temperature difference, energy conservation or heat exchange of the air conditioner can be controlled according to specific use environments, and therefore unnecessary energy waste is reduced.

As shown in fig. 2, the valve body control method according to an embodiment of the present invention specifically includes the following steps:

step S202, obtaining the return air temperature and the set temperature of the indoor unit;

step S204, determining a first temperature difference value between the return air temperature and the set temperature;

step S206, determining the demand degree corresponding to the indoor unit according to the first temperature difference value;

step S208, determining a second temperature difference range corresponding to the second temperature difference value according to the requirement degree;

and step S210, controlling the opening degree of an electronic expansion valve in the indoor unit according to the second temperature difference value.

Specifically, the demand degree corresponding to the indoor unit is determined through the first temperature difference, namely the demand degree of the indoor unit is determined through the difference between the return air temperature and the set temperature or the difference between the set temperature and the return air temperature, the different return air temperatures and the set temperature correspond to different demand degrees of the indoor unit, and when the difference between the return air temperature and the set temperature is large, the demand degree can be determined to be a high demand degree; when the difference between the return air temperature and the set temperature is small, the degree of demand can be determined to be a low degree of demand. And determining a corresponding second temperature difference range according to the demand degree and the second temperature difference, so that different indoor unit demand degrees can correspond to different second temperature difference ranges, and the control of the air conditioner electronic expansion valve is more precise and accurate.

Specifically, when the first temperature difference is large, the heat exchange demand between the heat exchanger in the indoor unit and the indoor air is large,

the compressor needs to supply more refrigerants to the heat exchanger, so that the demand degree of the indoor unit is considered to be higher, and a second temperature difference range corresponding to the indoor unit is determined according to the high demand degree of the indoor unit, so that the air conditioner controls the opening degree of the electronic expansion valve according to the second temperature difference value and the second temperature difference range, the compressor supplies the refrigerant quantity corresponding to the demand degree of the indoor unit to the indoor unit, the indoor temperature is changed rapidly, and the user demand is met; when the first temperature difference value is smaller, the heat exchange demand of the heat exchanger and indoor air in the indoor unit is smaller, and the compressor supplies the refrigerant with less heat exchanger to meet the heat exchange requirement, so that the demand degree of the indoor unit can be considered to be lower, and the second temperature difference range corresponding to the indoor unit is determined according to the low demand degree of the indoor unit, so that the air conditioner controls the opening degree of the electronic expansion valve according to the second temperature difference value and the second temperature difference range, the compressor supplies the refrigerant quantity corresponding to the demand degree of the indoor unit to the indoor unit, the small-range adjustment refrigerant supply quantity is realized under the condition of meeting the user demand, the refrigerant distribution is optimized, and the electric energy is saved.

As shown in fig. 3, the valve body control method according to an embodiment of the present invention specifically includes the following steps:

step S302, obtaining the return air temperature and the set temperature of the indoor unit;

step S304, determining a first temperature difference value between the return air temperature and the set temperature;

step S306, judging whether the first temperature difference value is within the first temperature difference range, if not, executing S308, otherwise, executing S312;

step S308, whether the first temperature difference value is smaller than the lower limit threshold of the first temperature difference range or not, if not, executing S310, otherwise, executing S314;

step S310, judging whether the first temperature difference value is larger than the upper limit threshold of the first temperature difference range, if not, executing S312, otherwise, executing S316;

step S312, determining the requirement degree as a medium requirement degree;

step S314, determining the demand degree as a low demand degree;

step S316, determining the demand degree as a high demand degree;

step S318, determining a second temperature difference range corresponding to the second temperature difference value according to the requirement degree;

and step S320, controlling the opening degree of an electronic expansion valve in the indoor unit according to the second temperature difference value.

Specifically, different first temperature difference values correspond to different demand degrees of the indoor unit, a first temperature difference range is predetermined, the demand degree of the indoor unit is determined according to the comparison relation between the first temperature difference value and the first temperature difference range, and when the first temperature difference value is within the first temperature difference range, the demand degree of the indoor unit is moderate, so that the demand degree is determined to be a medium demand degree; when the first temperature difference is smaller than the lower limit threshold of the first temperature difference range, the first temperature difference is smaller, the indoor unit demand degree is lower, and therefore the demand degree is determined to be the low demand degree; when the first temperature difference value is larger than the upper limit threshold of the first temperature difference range, the first temperature difference value is larger, the indoor unit demand degree is higher, and therefore the demand degree is determined to be the high demand degree. The demand degree of the indoor unit is set to be the medium demand degree, the low demand degree and the high demand degree according to the first temperature difference value, so that the air conditioner can adopt different control modes for the electronic expansion valve under the demands of the indoor unit with different degrees, the demands of the indoor unit are met, and the high-efficiency operation of the air conditioner is realized.

As shown in fig. 4, the valve body control method according to an embodiment of the present invention specifically includes the following steps:

step S402, obtaining the return air temperature and the set temperature of the indoor unit;

step S404, determining a first temperature difference value between the return air temperature and the set temperature;

step S406, judging whether the first temperature difference value is within the first temperature difference range, if not, executing S408, otherwise, executing S412;

step S408, judging whether the first temperature difference value is smaller than the lower limit threshold of the first temperature difference range, if not, executing S410, otherwise, executing S414;

step S410, whether the first temperature difference is greater than an upper threshold of the first temperature difference range, if not, performing S412, otherwise, performing S416;

step S412, determining the requirement degree as a medium requirement degree;

step S414, determining the demand degree as a low demand degree;

step S416, determining the requirement degree as a high requirement degree;

step S418, determining a second temperature difference range corresponding to the second temperature difference value according to the demand degree;

step S420, whether the second temperature difference is within the second temperature difference range, if not, performing S422, otherwise, performing S426;

step S422, whether the second temperature difference is smaller than the lower threshold of the second temperature difference range, if not, performing S424, otherwise, performing S428;

step S424, whether the second temperature difference is greater than the upper threshold of the second temperature difference range, if not, performing S426, otherwise, performing S430;

step S426, keeping the opening degree of the electronic expansion valve unchanged;

step 428, controlling the opening degree of the electronic expansion valve to increase;

and step S430, controlling the opening degree of the electronic expansion valve to be reduced.

Specifically, the opening degree of the electronic expansion valve is controlled according to the second temperature difference value, a second temperature difference range is determined, when the second temperature difference value is within the second temperature difference range, the opening degree of the electronic expansion valve is kept unchanged, the quantity of refrigerant supplied to an indoor unit is unchanged at the moment, the power operation of the indoor unit is unchanged, the indoor temperature is uniformly changed, and therefore the electric energy is saved under the condition that the customer requirements are met; when the second temperature difference value is smaller than the lower limit threshold value of the second temperature difference range, the refrigerant quantity in the heat exchanger of the indoor unit is considered to be too small, the opening degree of the electronic expansion valve is controlled to be increased, so that the refrigerant quantity supplied to the indoor unit is increased, the heat exchange efficiency of the heat exchanger of the indoor unit and indoor air is improved, and the indoor temperature is changed rapidly to meet the requirements of customers; when the second temperature difference value is larger than the upper limit threshold value of the second temperature difference range, the refrigerant quantity in the heat exchanger of the indoor unit is considered to be excessive, the opening degree of the electronic expansion valve is controlled to be reduced, so that the refrigerant quantity supplied by the indoor unit is reduced, a proper amount of refrigerant is supplied to the heat exchanger of the indoor unit to exchange heat with indoor air, more comfortable air supply is provided for users, the distribution of the refrigerant is controlled finely, the running frequency of the compressor is reduced, and electric energy is effectively saved.

In the above embodiment, the upper threshold value of the second temperature difference range of the high demand degree is greater than the upper threshold value of the second temperature difference range of the medium demand degree, and the upper threshold value of the second temperature difference range of the medium demand degree is greater than the upper threshold value of the second temperature difference range of the low demand degree; the lower threshold of the second temperature difference range with the high demand degree is larger than that of the second temperature difference range with the medium demand degree, and the lower threshold of the second temperature difference range with the medium demand degree is larger than that of the second temperature difference range with the low demand degree.

In this embodiment, when the demand levels of the indoor units are different, the second temperature difference ranges corresponding to the demand levels are also different, specifically, if the high demand level second temperature difference range is (Ah, Bh), the medium demand level second temperature difference range is (Am, Bm), and the low demand level second temperature difference range is (Al, Bl), Ah > Am > Al, and Bh > Bm > Bl.

As shown in fig. 5, the method for controlling a valve body at a medium demand level according to an embodiment of the present invention specifically includes the following steps: step S502, determining the requirement degree as a medium requirement degree;

step S504, determining a second temperature difference range corresponding to the second temperature difference value according to the demand degree;

step S506, judging whether the second temperature difference value is within the second temperature difference range, if not, executing S508, otherwise, executing S512;

step S508, whether the second temperature difference is smaller than a lower threshold of the second temperature difference range, if not, performing step S510, otherwise, performing step S514;

step S510, determining whether the second temperature difference is greater than an upper threshold of the second temperature difference range, if not, performing step S512, otherwise, performing step S516;

step S512, keeping the opening of the electronic expansion valve unchanged;

step S514, controlling the opening degree of the electronic expansion valve to increase by a first amplitude;

in step S516, the opening degree of the electronic expansion valve is controlled to decrease by a first margin.

Specifically, when the demand degree of the indoor unit is the medium demand degree, the reduction amplitude of the opening of the electronic expansion valve and the increase amplitude of the opening of the electronic expansion valve are both first amplitudes, so that when the demand degree of the air conditioner is the medium demand degree, after the electronic expansion valve is controlled to be opened and changed, the increased or decreased refrigerant quantity is equal, the indoor unit obtains a relatively stable refrigerant quantity, the air supply temperature is uniformly changed, and the use comfort level of a user is improved.

As shown in fig. 6, the method for controlling a valve body under a low demand level according to an embodiment of the present invention specifically includes the following steps:

step S602, determining the demand degree as a low demand degree;

step S604, determining a second temperature difference range corresponding to the second temperature difference value according to the requirement degree;

step S606, whether the second temperature difference value is within the second temperature difference range or not is judged, if not, S608 is executed, otherwise, S612 is executed;

step S608, whether the second temperature difference is smaller than a lower threshold of the second temperature difference range, if not, performing step S610, otherwise, performing step S614;

step S610, determining whether the second temperature difference is greater than an upper threshold of the second temperature difference range, if not, performing step S612, otherwise, performing step S616;

step S612, keeping the opening degree of the electronic expansion valve unchanged;

step S614, controlling the opening degree of the electronic expansion valve to increase by a first amplitude;

in step S616, the opening degree of the electronic expansion valve is controlled to decrease by a second margin.

Specifically, at a low demand level, the difference between the indoor temperature and the set temperature is small, the user demand is mainly to change the indoor temperature properly, if the second temperature difference is smaller than the lower threshold of the second temperature difference range, the opening of the electronic expansion valve is controlled to increase the first amplitude, the supply amount of the refrigerant is increased properly through the electronic expansion valve, the second temperature difference is increased, the heat exchange efficiency between the heat exchanger of the indoor unit and the indoor air is improved, the indoor temperature is changed properly, when the second temperature difference is larger than the upper threshold of the second temperature difference range, the opening of the electronic expansion valve is decreased by the second amplitude, the supply amount of the refrigerant is decreased, and the decrease amplitude of the second temperature difference is larger than the increase amplitude of the second temperature difference, through once or many times of adjustment, make the second temperature difference be in the second difference in temperature within range, and be close to the lower limit threshold value of second difference in temperature scope to under the condition that satisfies user's demand, supply with lower refrigerant volume, in order to practice thrift the electric energy.

As shown in fig. 7, the method for controlling a valve body under a high demand level according to an embodiment of the present invention specifically includes the following steps:

step S702, determining the demand degree as a high demand degree;

step S704, determining a second temperature difference range corresponding to the second temperature difference value according to the requirement degree;

step S706, judging whether the second temperature difference value is within the second temperature difference range, if not, executing S708, otherwise, executing S712;

step S708, determining whether the second temperature difference is smaller than a lower threshold of the second temperature difference range, if not, performing S710, otherwise, performing S714;

step S710, determining whether the second temperature difference is greater than an upper threshold of the second temperature difference range, if not, performing step S712, otherwise, performing step S716;

step S712, keeping the opening degree of the electronic expansion valve unchanged;

step 714, controlling the opening degree of the electronic expansion valve to increase by a second amplitude;

in step S716, the opening degree of the electronic expansion valve is controlled to decrease by a first margin.

Specifically, when the demand is high, if the second temperature difference is smaller than the lower threshold of the second temperature difference range, the user urgently needs to change the indoor temperature, the opening of the electronic expansion valve is controlled to increase the second amplitude, more refrigerants can be supplied to the indoor unit, the second temperature difference is increased, the heat exchange efficiency between the heat exchanger of the indoor unit and the indoor air is improved, the indoor temperature is quickly changed, when the second temperature difference is larger than the upper threshold of the second temperature difference range, the opening of the electronic expansion valve is reduced by the first amplitude to reduce the supply amount of the refrigerants, so that the second temperature difference is reduced, because the first amplitude is smaller than the second amplitude, the reduced supply amount of the refrigerants is smaller than the increased supply amount of the refrigerants, so that the reduced amplitude of the second temperature difference is smaller than the increased amplitude of the second temperature difference, and the second temperature difference is in the second temperature difference range through one or multiple times of adjustment, the heat exchange efficiency of the heat exchanger of the indoor unit and indoor air is in a proper range, more comfortable air supply is provided under the condition of meeting the user demand, and the optimal distribution of the supply refrigerant quantity under the high demand degree is realized by adjusting the opening degree of the electronic expansion valve for many times, so that the electric energy is saved.

As shown in fig. 8, the valve body control method according to an embodiment of the present invention specifically includes the following steps:

step S802, obtaining the return air temperature and the set temperature of the indoor unit;

step S804, determining the operation mode of the indoor unit;

step S806, determining a refrigeration mode;

step S808, determining a heating mode;

step S810, determining a first temperature difference value as a difference value between return air temperature and set temperature;

step S812, determining that the first temperature difference is a difference between the set temperature and the return air temperature;

step S814, determining whether the first temperature difference is within the first temperature difference range, if not, performing S818, otherwise, performing S820;

step S816, whether the first temperature difference is smaller than the lower threshold of the first temperature difference range, if not, performing S818, otherwise, performing S822;

step S818, whether the first temperature difference value is larger than the upper limit threshold of the first temperature difference range, if not, S820 is executed, otherwise, S824 is executed;

step S820, determining the requirement degree as a medium requirement degree;

step S822, determining the requirement degree as a low requirement degree;

step S824, determining the degree of demand to be a high degree of demand;

step S826, determining a second temperature difference range corresponding to the second temperature difference value according to the requirement degree;

step S828, determining whether the second temperature difference is within the second temperature difference range, if not, performing step S830, otherwise, performing step S834;

step S830, whether the second temperature difference is smaller than a lower threshold of the second temperature difference range, if not, performing S832, otherwise, performing S836;

step S832, whether the second temperature difference is greater than the upper threshold of the second temperature difference range, if not, executing S834, otherwise, executing S838;

step S834 of maintaining the opening degree of the electronic expansion valve unchanged;

step S836, controlling the opening degree of the electronic expansion valve to increase;

in step S838, the opening degree of the electronic expansion valve is controlled to decrease.

Specifically, the air conditioner is set with a cooling mode and a heating mode, when the operation mode is the cooling mode, the indoor temperature is greater than the set temperature of a user, namely the return air temperature is greater than the set temperature, and therefore, the first temperature difference is the difference between the return air temperature and the set temperature; when the operation mode is the heating mode, the indoor temperature is lower than the set temperature, namely the return air temperature is lower than the set temperature, so that the first temperature difference is the difference between the set temperature and the return air temperature.

As shown in fig. 9, the valve body control method according to an embodiment of the present invention specifically includes the following steps:

step S902, obtaining the return air temperature and the set temperature of the indoor unit;

step S904, determining a cooling mode;

step S906, determining the difference value between the return air temperature and the set temperature;

step S908, determining whether the first temperature difference is within the first temperature difference range, if not, performing S910, otherwise, performing S914;

step S910, determining whether the first temperature difference is smaller than a lower threshold of the first temperature difference range, if not, performing S912, otherwise, performing S916;

step S912, determining whether the first temperature difference is greater than an upper threshold of the first temperature difference range, if not, performing S914, otherwise, performing S918;

step S914, determining the demand degree as a medium demand degree;

step S916, determining the demand level as a low demand level;

step S918, determining the demand level as a high demand level;

step S920, determining a second temperature difference range corresponding to the second temperature difference value according to the demand degree;

step S922, determining whether the second temperature difference is within the second temperature difference range, if not, executing step S924, otherwise, executing step S928;

step S924, determining whether the second temperature difference is smaller than a lower threshold of the second temperature difference range, if not, performing S926, otherwise, performing S930;

in step S926, whether the second temperature difference is greater than the upper threshold of the second temperature difference range, if not, performing S928, otherwise, performing S932;

step S928, keeping the opening degree of the electronic expansion valve unchanged;

step S930, controlling an opening degree of the electronic expansion valve to increase;

in step S932, the opening degree of the electronic expansion valve is controlled to decrease.

Specifically, when the operation mode is the refrigeration mode, the set temperature is lower than the heat exchanger tube temperature, so that the second temperature difference is the difference between the set temperature and the heat exchanger tube temperature, and when the refrigeration function of the air conditioner is started, the opening degree of the electronic expansion valve is controlled according to the difference between the set temperature and the heat exchanger tube temperature, so that the refrigerant distribution function is achieved.

As shown in fig. 10, the valve body control method according to an embodiment of the present invention specifically includes the following steps:

step S1002, acquiring the return air temperature and the set temperature of the indoor unit;

step S1004, determining a heating mode;

step S1006, determining the difference between the set temperature and the return air temperature;

step S1008, judging whether the first temperature difference value is within a first temperature difference range, if not, executing S1010, otherwise, executing S1014;

step S1010, whether the first temperature difference is smaller than a lower threshold of the first temperature difference range, if not, performing S1012, otherwise, performing S1016;

step S1012, determining whether the first temperature difference is greater than an upper threshold of the first temperature difference range, if not, executing S1014, otherwise, executing S1018;

step S1014, determining the requirement degree as a medium requirement degree;

step S1016, determining the degree of demand as a low degree of demand;

step S10110, determining the demand degree as a high demand degree;

step S1020, determining a second temperature difference range corresponding to the second temperature difference value according to the requirement degree;

step S1022, whether a difference between the tube temperature of the heat exchanger and the set temperature is within a second temperature difference range, if not, executing S1024, otherwise, executing S1028;

step S1024, judging whether the difference value of the heat exchanger temperature and the set temperature is smaller than the lower limit threshold of the second temperature difference range, if not, executing S1026, otherwise, executing S1030;

step S1026, judging whether the difference value of the heat exchanger temperature and the set temperature is larger than the upper limit threshold value of the second temperature difference range, if not, executing S1028, otherwise, executing S1032;

step S1028, keeping the opening degree of the electronic expansion valve unchanged;

step S1030, controlling the opening of the electronic expansion valve to increase;

in step S1032, the opening degree of the electronic expansion valve is controlled to decrease.

Specifically, when the operation mode is the heating mode, the set temperature is greater than the heat exchanger tube temperature, and therefore, the second temperature difference is the difference between the heat exchanger tube temperature and the set temperature, so that when the air conditioner starts the heating function, the opening degree of the electronic expansion valve is controlled according to the difference between the heat exchanger tube temperature and the set temperature, and the refrigerant distribution effect is achieved.

According to another embodiment of the present invention, an indoor unit is provided, which is used in any one of the valve body control methods in the above embodiments, and includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the steps of the valve body control method in any one of the above embodiments when executing the computer program, and therefore the steps have the technical effects of any one of the above embodiments, and are not described herein again.

Yet another embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of any of the above-mentioned valve body control methods, so that the technical effects of any of the above-mentioned embodiments are achieved, and are not described herein again.

According to the valve body control method provided by the application, the opening degree of the electronic expansion valve can be controlled by acquiring the return air temperature, the set temperature and the heat exchanger tube temperature and according to the first temperature difference value of the return air temperature and the set temperature and the second temperature difference value of the heat exchanger tube temperature of the indoor unit, so that the refrigerant distribution in the indoor unit is optimized, the working efficiency of an air conditioner is improved, and the electric energy is saved.

As shown in fig. 2, the return air temperature and the set temperature of the indoor unit are obtained, and a first temperature difference between the return air temperature and the set temperature is determined, so that a difference between the return air temperature and the set temperature of a user can be obtained. The demand degree corresponding to the indoor unit is determined through the first temperature difference value, namely the demand degree of the indoor unit is determined through the difference value between the return air temperature and the set temperature or the difference value between the set temperature and the return air temperature, different return air temperatures and set temperatures are determined, the demand degree of the indoor unit corresponding to different degrees is determined, the air conditioner can divide the demand degree of the indoor unit into a plurality of different levels, the range of the second temperature difference value corresponding to the demand degree and the second temperature difference value is determined, the demand degree of the indoor unit at different levels is made, different ranges of the second temperature difference value can be corresponded, and the electronic expansion valve of the air conditioner is more fine and accurate in control.

Specifically, when the air conditioner is operated, firstly, the return air temperature T1 and the set temperature Ts of the indoor unit are obtained, when the set temperature Ts is less than the return air temperature T1, the air conditioner starts a refrigeration mode at the moment, the range (1, a) of the difference between the return air temperature and the set temperature is preset, when the difference between the return air temperature and the set temperature is between (1, a), the requirement degree of the indoor unit at the moment is determined to be the medium requirement degree, when the difference between the return air temperature and the set temperature is greater than or equal to a, the requirement degree of the indoor unit is determined to be the high requirement degree, and when the difference between the return air temperature and the set temperature is less than 1, the requirement degree of the indoor unit is determined to be the low requirement degree. When the demand degree is in the middle, determining that the decreasing amplitude and the increasing amplitude of the electronic expansion valve are both the first amplitude delta Step 1; determining that the opening degree of the electronic expansion valve is reduced by a second amplitude delta Step2 and the first amplitude delta Step1 when the demand degree is low; when the demand level is high, the opening degree of the electronic expansion valve is determined to be decreased by a first amplitude delta Step1 and increased by a second amplitude delta Step 2. And then determining a second temperature difference range corresponding to the difference between the set temperature and the heat exchanger tube temperature according to the demand degree, wherein the second temperature difference range is (c, b) in the case of high demand degree, the second temperature difference range is (c-delta c1, b-delta c1) in the case of medium demand degree, and the second temperature range is (c-delta c2, b-delta c2) in the case of low demand degree.

When the high demand degree is determined, judging the relation between the difference value between the set temperature and the heat exchanger tube temperature and the second temperature difference range (c, b), and when the difference value between the set temperature and the heat exchanger tube temperature is more than or equal to b, indicating that the quantity of the refrigerant distributed to the indoor unit is too much, and the opening degree delta Step1 of the electronic expansion valve needs to be reduced; when the difference value between the set temperature and the heat exchanger tube temperature is within (c, b), the quantity of the refrigerant distributed to the indoor unit is proper, the electronic expansion valve of the indoor unit keeps the current opening, and when the difference value between the set temperature and the heat exchanger tube temperature is smaller than c, the quantity of the refrigerant distributed to the indoor unit is insufficient, and the opening delta Step2 of the electronic expansion valve needs to be increased.

When the medium demand degree is determined, judging the relation between the difference value between the set temperature and the heat exchanger tube temperature and the second temperature difference range (c-delta c1, b-delta c1), and when the difference value between the set temperature and the heat exchanger tube temperature is more than or equal to b-delta c1, indicating that the refrigerant quantity distributed to the indoor unit is too much and the opening degree delta Step1 of the electronic expansion valve needs to be reduced; when the difference value between the set temperature and the heat exchanger tube temperature is within (c-delta c1, b-delta c1), the refrigerant quantity distributed to the indoor unit is proper, the current opening degree of the electronic expansion valve of the indoor unit is kept, and when the difference value between the set temperature and the heat exchanger tube temperature is smaller than c-delta c1, the refrigerant quantity distributed to the indoor unit is insufficient, and the opening degree delta Step1 of the electronic expansion valve needs to be increased.

When the low demand degree is determined, judging the relationship between the difference value between the set temperature and the heat exchanger tube temperature and the second temperature difference range (c-delta c2, b-delta c2), and when the difference value between the set temperature and the heat exchanger tube temperature is more than or equal to b-delta c2, indicating that the refrigerant quantity distributed to the indoor unit is too much and the opening degree delta Step2 of the electronic expansion valve needs to be reduced; when the difference value between the set temperature and the heat exchanger tube temperature is within (c-delta c2, b-delta c2), the quantity of the refrigerant distributed to the indoor unit is proper, and the electronic expansion valve of the indoor unit keeps the current opening; if the difference between the set temperature and the heat exchanger tube temperature is less than c- Δ c2, it means that the amount of refrigerant distributed to the indoor unit is insufficient, and the electronic expansion valve opening Δ Step1 needs to be increased.

Wherein a, b, c are constants, b > c, and b > a; Δ Step1 < [ delta ] Step2, [ delta ] b2 > [ delta ] b1, [ delta ] c2 > [ delta ] c 1.

When the air conditioner is operated, firstly, the return air temperature T1 and the set temperature Ts of the indoor unit are obtained, when the set temperature Ts is greater than the return air temperature T1, the air conditioner starts a heating mode at the moment, the range (1, a) of the difference value between the return air temperature and the set temperature is preset, when the difference value between the return air temperature and the set temperature is between (1, a), the requirement degree of the indoor unit at the moment is determined to be the medium requirement degree, when the difference value between the return air temperature and the set temperature is greater than or equal to a, the requirement degree of the indoor unit is determined to be the high requirement degree, and when the difference value between the return air temperature and the set temperature is less than 1, the requirement degree of the indoor unit is determined to be the low requirement degree. When the demand degree is in the middle, determining that the decreasing amplitude and the increasing amplitude of the electronic expansion valve are both the first amplitude delta Step 3; determining that the opening degree of the electronic expansion valve is reduced by a second amplitude delta Step4 and the first amplitude delta Step3 when the demand degree is low; when the demand level is high, the opening degree of the electronic expansion valve is determined to be decreased by a first amplitude delta Step3 and increased by a second amplitude delta Step 4. And then determining a second temperature difference range corresponding to the difference value of the set temperature of the heat exchanger tube according to the demand degree, wherein the second temperature difference range is (n, m) in the case of high demand degree, the second temperature difference range is (n-delta n1, m-delta n1) in the case of medium demand degree, and the second temperature range is (n-delta n2, m-delta n2) in the case of low demand degree.

When the high demand degree is determined, judging the relationship between the difference value of the heat exchanger tube temperature and the set temperature and the second temperature difference range (n, m), and when the difference value of the heat exchanger tube temperature and the set temperature is more than or equal to m, indicating that the refrigerant quantity distributed to the indoor unit is too much, and the opening degree delta Step3 of the electronic expansion valve needs to be reduced; when the difference value between the tube temperature of the heat exchanger and the set temperature is within (n, m), the proper amount of the refrigerant distributed to the indoor unit is indicated, the current opening degree of the electronic expansion valve of the indoor unit is kept, and when the difference value between the tube temperature of the heat exchanger and the set temperature is less than n, the insufficient amount of the refrigerant distributed to the indoor unit is indicated, and the opening degree delta Step4 of the electronic expansion valve needs to be increased.

When the medium demand degree is determined, judging the relationship between the difference value of the set temperature of the heat exchanger tube and the second temperature difference range (n-delta n1, m-delta n1), and when the difference value of the set temperature of the heat exchanger tube and the second temperature difference range is more than or equal to m-delta n1, indicating that the refrigerant quantity distributed to the indoor unit is too much and the opening degree delta Step3 of the electronic expansion valve needs to be reduced; when the difference value of the heat exchanger tube temperature and the set temperature is within (n-delta n1, m-delta n1), the proper amount of the refrigerant distributed to the indoor unit is indicated, the current opening degree of the electronic expansion valve of the indoor unit is kept, and when the difference value of the heat exchanger tube temperature and the set temperature is smaller than n-delta n1, the insufficient amount of the refrigerant distributed to the indoor unit is indicated, and the opening degree delta Step3 of the electronic expansion valve needs to be increased.

When the low demand degree is determined, judging the relationship between the difference value of the set temperature of the heat exchanger tube and the second temperature difference range (n-delta n2, m-delta n2), and when the difference value of the set temperature of the heat exchanger tube and the second temperature difference range is more than or equal to m-delta n2, indicating that the refrigerant quantity distributed to the indoor unit is too much and the opening degree delta Step4 of the electronic expansion valve needs to be reduced; when the difference value of the heat exchanger tube temperature and the set temperature is within (n-delta n2, m-delta n2), the quantity of the refrigerant distributed to the indoor unit is proper, and the electronic expansion valve of the indoor unit keeps the current opening; if the difference between the heat exchanger tube temperature and the set temperature is less than n- Δ n2, it means that the refrigerant quantity distributed to the indoor unit is insufficient, and the opening Δ Step3 of the electronic expansion valve needs to be increased.

Wherein a, m and n are constants, and m is more than n and is more than a; Δ Step3 < [ delta ] Step4, [ delta ] m2 > [ delta ] m1, [ delta ] n2 > [ delta ] n 1.

The technical scheme of the invention is explained in detail by combining the attached drawings, and the valve body control method provided by the invention can control the opening degree of the electronic expansion valve according to the return air temperature, the set temperature and the heat exchanger tube temperature, thereby optimizing the refrigerant distribution in the indoor unit, improving the working efficiency of the air conditioner, saving electric energy, and adjusting the air supply temperature step by step according to the requirement to provide more comfortable air supply for users.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve body control method is used for an indoor unit, and is characterized by comprising the following steps:

acquiring the return air temperature and the set temperature of the indoor unit;

determining a first temperature difference between the return air temperature and the set temperature;

determining a second temperature difference value between the set temperature and the temperature of a heat exchanger pipe of the indoor unit according to the first temperature difference value;

controlling the opening degree of an electronic expansion valve in the indoor unit according to the second temperature difference value;

the determining a second temperature difference between the set temperature and the temperature of the heat exchanger tube of the indoor unit according to the first temperature difference specifically includes:

determining the demand degree corresponding to the indoor unit according to the first temperature difference value;

determining a second temperature difference range corresponding to the second temperature difference value according to the demand degree;

the determining, according to the first temperature difference, a degree of demand corresponding to the indoor unit specifically includes:

if the first temperature difference value is larger than the upper limit threshold of the first temperature difference range, the demand degree is a high demand degree;

when the demand degree is a high demand degree, the opening degree of the electronic expansion valve is reduced by a first amplitude, and the opening degree of the electronic expansion valve is increased by a second amplitude;

wherein the first amplitude is less than the second amplitude.

2. The valve body control method according to claim 1, wherein the determining a degree of demand corresponding to the indoor unit according to the first temperature difference value further includes:

if the first temperature difference value is within the first temperature difference range, the demand degree is a medium demand degree;

and if the first temperature difference value is smaller than the lower limit threshold of the first temperature difference range, the requirement degree is a low requirement degree.

3. The valve body control method according to claim 2, wherein the controlling the opening degree of the electronic expansion valve in the indoor unit according to the second temperature difference specifically comprises:

when the second temperature difference value is within the second temperature difference range, keeping the opening degree of the electronic expansion valve unchanged;

when the second temperature difference value is smaller than the lower limit threshold value of the second temperature difference range, controlling the opening degree of the electronic expansion valve to increase;

and when the second temperature difference value is larger than the upper limit threshold value of the second temperature difference range, controlling the opening degree of the electronic expansion valve to be reduced.

4. The valve body control method according to claim 3, wherein an upper limit threshold of the second temperature difference range of the high demand degree is larger than an upper limit threshold of the second temperature difference range of the medium demand degree, and the upper limit threshold of the second temperature difference range of the medium demand degree is larger than the upper limit threshold of the second temperature difference range of the low demand degree;

the lower limit threshold of the second temperature difference range of the high demand degree is greater than the lower limit threshold of the second temperature difference range of the medium demand degree, and the lower limit threshold of the second temperature difference range of the medium demand degree is greater than the lower limit threshold of the second temperature difference range of the low demand degree.

5. The valve body control method according to claim 3, wherein, when the degree of demand is a medium degree of demand, a decreasing amplitude of the opening degree of the electronic expansion valve is the same as an increasing amplitude of the opening degree of the electronic expansion valve, and both the decreasing amplitude and the increasing amplitude are the first amplitude;

and when the demand degree is a low demand degree, the opening degree of the electronic expansion valve is reduced by a second amplitude, and the opening degree of the electronic expansion valve is increased by a first amplitude.

6. The valve body control method according to any one of claims 1 to 5, further comprising, before the determining the first temperature difference between the return air temperature and the set temperature:

determining an operation mode of the indoor unit;

when the operation mode is a cooling mode, the first temperature difference is the difference between the return air temperature and the set temperature, and when the operation mode is a heating mode, the first temperature difference is the difference between the set temperature and the return air temperature.

7. The valve control method according to claim 6, wherein the determining a second temperature difference between the set temperature and a heat exchanger tube temperature of the indoor unit specifically comprises:

when the operation mode is a cooling mode, the second temperature difference is the difference between the set temperature and the heat exchanger tube temperature;

when the operation mode is a heating mode, the second temperature difference is a difference between the tube temperature of the heat exchanger and the set temperature.

8. An indoor unit comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the valve body control method according to any one of claims 1 to 7 when executing the computer program.

9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the valve body control method according to any one of claims 1 to 7.