CN114383266A

CN114383266A - Defrosting frequency control method and air conditioning system

Info

Publication number: CN114383266A
Application number: CN202111556127.8A
Authority: CN
Inventors: 熊绍森; 廖敏; 连彩云; 梁之琦; 徐耿彬; 黎优霞
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-04-22
Anticipated expiration: 2041-12-17
Also published as: CN114383266B

Abstract

The invention provides a defrosting frequency control method and an air conditioning system, belonging to the technical field of air conditioners, wherein the method comprises the following steps: starting defrosting dieFormula (I), compressor operating frequency F for determining heating decay period₀Determining the operation frequency correction F of the compressor at the initial stage of defrosting_{Initial correction}(ii) a According to F₀、F_{Initial correction}Determining the operating frequency F of the compressor at the initial stage of defrosting_{Initial stage}(ii) a Determining a defrost mid-stage compressor operating frequency correction F_{Mid-term correction}(ii) a According to F_{Initial stage}、F_{Mid-term correction}Determining the operating frequency F of the compressor in the middle of defrosting_{Middle stage}(ii) a Determining a compressor operating frequency correction F at the end of defrost_{End stage correction}(ii) a According to F₀、F_{End stage correction}Determining the frequency F of operation of the compressor at the end of the defrost_{End stage}. The method can adjust the running frequency of the compressor in the defrosting mode in stages, so that on the premise of ensuring the defrosting effect, higher comfort is kept indoors, and better use experience is provided for users.

Description

Defrosting frequency control method and air conditioning system

Technical Field

The invention relates to the technical field of air conditioners, in particular to a defrosting frequency control method and an air conditioning system.

Background

The air conditioning system runs a heating mode for a long time in a low-temperature environment in winter, the surface of the outdoor heat exchanger is easy to frost, and the frost layer can influence the heat exchange effect of the air conditioner. The conventional common method for solving the problem of air conditioner frosting is as follows: when the air conditioner enters a defrosting mode, the air conditioner is switched from a heating operation to a cooling operation, and the frequency of the compressor is adjusted to the target defrosting frequency. Meanwhile, other components are cooperatively controlled, so that a refrigerant with higher temperature flows through the outdoor heat exchanger, the surface temperature of the heat exchanger is increased, a frost layer is melted, and the heating mode is switched back after defrosting is finished. The defrosting frequency of the compressor is crucial to the influence of the defrosting process, and the defrosting frequency of the existing air conditioner during defrosting is mostly a fixed value, which easily causes the following situations in the defrosting process: 1) the defrosting frequency is set to be low, and the defrosting time is longer; 2) the defrosting frequency is set to be higher, and the indoor temperature can be greatly reduced in a short time, so that the indoor comfort is influenced.

Referring to fig. 1, after the air conditioning system enters the defrosting mode, the temperature of the copper pipe of the outdoor heat exchanger will change regularly with the lapse of the defrosting timeAnd (4) transforming. According to T in defrost mode_{Outer tube}The change process of the method can be divided into three stages of an initial stage of defrosting, a middle stage of defrosting and a final stage of defrosting, wherein a stage of extremely fast attenuation, namely a heating attenuation period, exists before the temperature of the outdoor heat exchanger enters the defrosting. The running frequency of the compressor is adjusted according to the actual conditions of the different stages, so that the defrosting effect can be ensured, and the indoor comfort is kept high in the defrosting process.

Disclosure of Invention

In order to overcome the problems in the related art, one of the objectives of the present invention is to provide a defrosting frequency control method, which can adjust the operating frequency of a compressor in a defrosting mode in stages, so as to maintain high comfort indoors and provide users with good use experience while ensuring defrosting effect.

A defrost frequency control method comprising:

starting defrosting mode, determining compressor running frequency F in heating attenuation period₀Determining the operation frequency correction F of the compressor at the initial stage of defrosting_{Initial correction}；

According to F₀、F_{Initial correction}Determining the operating frequency F of the compressor at the initial stage of defrosting_{Initial stage}；

Determining a defrost mid-stage compressor operating frequency correction F_{Mid-term correction}；

According to F_{Initial stage}、F_{Mid-term correction}Determining the operating frequency F of the compressor in the middle of defrosting_{Middle stage}；

Determining a compressor operating frequency correction F at the end of defrost_{End stage correction}；

According to F₀、F_{End stage correction}Determining the frequency F of operation of the compressor at the end of the defrost_{End stage}。

In a preferred embodiment of the present invention, the operating frequency F of the compressor for determining the heating decay period is₀The method comprises the following steps:

obtaining the maximum operation frequency F of the compressor in the heating decay period_{Operation max}And a minimum operating frequency F_{Run min}；

According to formula F₀＝1/2*(F_{Operation max}+F_{Run min}) Calculating F₀。

In a preferred embodiment of the present invention, the determining of the operating frequency correction F of the compressor at the initial stage of defrosting_{Initial correction}The method comprises the following steps:

detect entering into outdoor side heat exchanger copper pipe temperature T who changes frost moment_A；

According to T_ARange determination of (F)_{Initial correction}The value of (c).

In a preferred embodiment of the present invention, the term T is_ARange determination of (F)_{Initial correction}The values of (a) include:

by setting T_ATemperature interval table to determine F_{Initial correction}The value of (c).

In a preferred embodiment of the present invention, the determination of the operation frequency correction amount F of the compressor in the middle stage of defrosting_{Mid-term correction}The method comprises the following steps:

recording the operation time t at the initial stage of defrosting₁；

Recording the amplitude delta T of indoor temperature drop at the initial stage of defrosting₁；

By setting t₁、△T₁Interval table to determine F together_{Mid-term correction}The value of (c).

In a preferred embodiment of the present invention, the determination of the operation frequency correction amount F of the compressor at the end of defrosting_{End stage correction}The method comprises the following steps:

detecting temperature T of copper pipe of outdoor heat exchanger entering defrosting end stage_C；

According to T_CRange determination of (F)_{End stage correction}The value of (c).

In a preferred embodiment of the present invention, the term T is_CRange determination of (F)_{End stage correction}The values of (a) include:

by setting T_CTemperature interval table to determine F_{End stage correction}The value of (c).

In a preferred embodiment of the present invention, the F_{Initial stage}Value of (A) is less than or equal to that in the heating process of the compressorThe maximum operating frequency of.

In a preferred embodiment of the present invention, the F_{Initial stage}The determination method comprises the following steps:

F_{initial stage}＝F₀+F_{Initial correction}；

Said F_{Middle stage}The determination method comprises the following steps:

F_{middle stage}＝F₀+F_{Mid-term correction}；

Said F_{End stage}The determination method comprises the following steps:

F_{end stage}＝F₀+F_{End stage correction}。

The invention also aims to provide an air conditioning system which comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, a throttling device, a four-way valve and a controller, wherein the compressor, the outdoor heat exchanger, the indoor heat exchanger, the throttling device and the four-way valve form a closed refrigeration cycle loop, and the controller can execute the defrosting frequency control method.

After the air conditioning system enters the defrosting mode, the running frequency of the compressor in the defrosting stage can be adjusted in stages according to the temperature of the coil pipe of the outdoor heat exchanger, the actual indoor environment temperature and other parameters, the defrosting effect of the air conditioning system can be guaranteed, the indoor temperature can be kept in a comfortable range, and better air conditioning use experience is provided for users.

The invention has the beneficial effects that:

the invention provides a defrosting frequency control method, which determines the operating frequency of a compressor at the initial stage of defrosting according to the operating frequency of the compressor at the attenuation period of heating and the operating frequency correction quantity of the compressor at the initial stage of defrosting; determining the compressor operation frequency in the middle stage of defrosting according to the compressor operation frequency in the initial stage of defrosting and the compressor operation frequency correction amount in the middle stage of defrosting; and finally, determining the operating frequency of the compressor at the last stage of defrosting according to the operating frequency of the compressor at the heating attenuation stage and the operating frequency correction quantity of the compressor at the last stage of defrosting, so as to achieve the purpose of adjusting the operating frequency of the compressor in the defrosting mode in stages. The method has the advantages that the running frequency of the compressor is adjusted in stages, the running of the compressor can be automatically adjusted according to different running conditions of the air conditioning system and the indoor environment, compared with the technology that the compressor is defrosted by fixed frequency in the prior art, the method is more intelligent, the indoor comfort can be kept high on the premise that the defrosting effect is guaranteed, and good air conditioning use experience is provided for users.

The invention also provides an air conditioning system comprising the defrosting frequency control method, and the air conditioning system can maintain better indoor comfort level while ensuring the defrosting effect and can provide better air conditioning use experience for users.

Drawings

FIG. 1 is a schematic diagram of the temperature change process of the air conditioner outer tube during the defrosting process provided by the present invention;

FIG. 2 is a flow chart of a defrost frequency control method provided by the present invention;

FIG. 3 is a graph illustrating the operation frequency correction F for determining the initial stage of defrosting compressor according to the present invention_{Initial correction}A flow chart of (1);

FIG. 4 is a graph of the amount of correction F for determining the operating frequency of the compressor during mid defrost provided by the present invention_{Mid-term correction}A flow chart of (1);

FIG. 5 is a graph of the amount of correction F provided by the present invention to determine the operating frequency of the compressor at the end of defrost_{End stage correction}A flow chart of (1);

fig. 6 is a schematic structural diagram of an air conditioning system provided by the present invention.

Reference numerals:

1. an outdoor side heat exchanger; 2. a compressor; 3. a four-way valve; 4. an indoor-side heat exchanger; 5. a throttling device.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that, although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

As shown in fig. 1, after the air conditioning system enters the defrosting control, the temperature of the copper pipe of the outdoor heat exchanger changes regularly as the defrosting time goes on. Can be according to T_{Outer tube}The whole defrosting process is divided into three stages of an initial stage of defrosting, a middle stage of defrosting and a final stage of defrosting. Wherein, the outdoor coil temperature has a period of extremely fast attenuation before entering into defrosting, and the period is defined as a heating attenuation period.

Referring to FIG. 1, the initial stage of defrosting A → B, point A is the moment of entering defrosting, T_ARepresenting the value of the outside tube temperature at the moment of defrost entry, generally, T_AIs a very low value. In this stage, the high-temperature gaseous refrigerant of the compressor directly enters the outdoor heat exchanger for defrosting, so T_{Outer tube}A fast lifting process may occur;

when running cumulatively t₁After the time, the defrosting enters a middle defrosting stage B → C, and the heat of the high-temperature gaseous refrigerant is mainly used in the stageThe method is used for melting the frost layer on the surface of the heat exchanger, the solid-liquid phase change process of the frost layer mainly occurs on the surface of the heat exchanger, and the change amplitude of the temperature of the outer pipe is relatively small;

when running cumulatively t₂After the time is long, the defrosting is carried out at the last stage, at the moment, the frost layer accumulated on the surface of the heat exchanger is basically completely melted, and the high-temperature refrigerant directly heats the copper pipe, so that the temperature of the outer pipe can quickly rise again.

The invention provides a defrosting frequency control method based on the rule, which utilizes the temperature change of a copper pipe of an outdoor heat exchanger of an air conditioning system in a defrosting mode to dynamically adjust the running frequency of a compressor in stages by combining the temperature change of an indoor environment and the duration of different stages. Referring to fig. 2, the method specifically includes the following steps:

s100, operating an air conditioner in a heating mode;

s200, selecting whether to enter a defrosting mode according to the detected outdoor unit condition; of course, it may be considered that whether or not the defrost mode is entered is selected.

S300, starting a defrosting mode, and determining the running frequency F of the compressor in the heating attenuation period₀Determining the operation frequency correction F of the compressor at the initial stage of defrosting_{Initial correction}(ii) a At this time, the air conditioning system is switched from the ordinary heating mode to the defrosting mode, and the temperature of the outdoor coil is quickly attenuated to the point A. F_{Initial correction}The value of (d) and the temperature T of the copper pipe of the outdoor heat exchanger at the initial stage of defrosting_AIt is related. Referring to fig. 3, this embodiment further comprises the sub-steps of:

s301, detecting the temperature of a copper pipe of the outdoor heat exchanger at the defrosting time;

s302, according to T_ARange determination of (F)_{Initial correction}The value of (c).

T_ACan reflect the frosting degree and the defrosting difficulty of the outside heat exchanger, and under the condition of the same outside temperature, T is_AThe smaller the frost formation, the more severe it is. To ensure that the frost is removed, it is therefore necessary to follow T_AThe defrosting frequency is corrected by the value of (1). It should be noted that, in the present application, the temperature of the copper pipe of the outdoor heat exchanger refers to the outdoor heat exchangeTemperature at the outlet of the refrigerant tube.

S400, according to F₀、F_{Initial correction}Determining the operating frequency F of the compressor at the initial stage of defrosting_{Initial stage}(ii) a According to T_ATemperature determination of F_{Initial correction}After the value of (D), it can be determined according to the formula F_{Initial stage}＝F₀+F_{Initial correction}To determine the operating frequency F of the compressor at the initial stage of defrosting_{Initial stage}. In addition, F is_{Initial stage}The value of (a) is equal to or less than the maximum operating frequency during the heating process of the compressor.

S500, determining the operation frequency correction F of the compressor in the middle period of defrosting_{Mid-term correction}(ii) a In order to ensure the comfort of the indoor environment, the defrosting effect can be ensured. Mid-defrost compressor operating frequency correction F_{Mid-term correction}From the defrosting initial period running time t₁And the indoor temperature reduction amplitude Delta T at the initial stage of defrosting₁To be determined collectively.

Referring to fig. 4, this embodiment further comprises the sub-steps of:

s501, recording the operation time t in the initial defrosting stage₁；

S502, recording indoor temperature reduction amplitude delta T at the initial stage of defrosting₁；

S503, setting t₁、△T₁Interval table to determine F together_{Mid-term correction}。

S600, according to F_{Initial stage}、F_{Mid-term correction}Determining the operating frequency F of the compressor in the middle of defrosting_{Middle stage}(ii) a After the operating frequency correction quantity of the compressor in the middle stage of defrosting is determined, the formula F can be used_{Middle stage}＝F₀+F_{Mid-term correction}To determine the operating frequency of the compressor during the defrosting.

S700, determining the operation frequency correction F of the compressor at the end of defrosting_{End stage correction}(ii) a Correction quantity at last stage of defrosting and temperature T of copper pipe of outdoor heat exchanger at last stage of defrosting_CAnd (4) correlating. Referring to fig. 5, this embodiment further comprises the sub-steps of:

s701, detecting the temperature T of a copper pipe of an outdoor heat exchanger entering the end stage of defrosting_C；

S702, according to T_CRange determination of (F)_{End stage correction}The value of (c).

S800, according to F₀、F_{End stage correction}Determining the frequency F of operation of the compressor at the end of the defrost_{End stage}. Determination of good F_{End stage correction}Then, the formula F can be used_{End stage}＝F₀+F_{End stage correction}To determine the operating frequency F of the compressor at the end of the defrost_{End stage}。

S900, the compressor is F_{End stage}The defrosting mode is automatically quitted after the set time of the frequency operation or the condition of quitting the defrosting mode is reached, and the defrosting is finished.

In the above defrosting frequency control method, the operating frequency of the compressor at the initial stage of defrosting is determined according to the operating frequency of the compressor at the heating decay period and the operating frequency correction amount of the compressor at the initial stage of defrosting; determining the compressor operation frequency in the middle stage of defrosting according to the compressor operation frequency in the initial stage of defrosting and the compressor operation frequency correction amount in the middle stage of defrosting; and finally, determining the operating frequency of the compressor at the last stage of defrosting according to the operating frequency of the compressor at the heating attenuation stage and the operating frequency correction quantity of the compressor at the last stage of defrosting, so as to achieve the purpose of adjusting the operating frequency of the compressor in the defrosting mode in stages. The method has the advantages that the running frequency of the compressor is adjusted in stages, the running of the compressor can be automatically adjusted according to different running conditions of the air conditioning system and the indoor environment, compared with the technology that the compressor is defrosted by fixed frequency in the prior art, the method is more intelligent, the indoor comfort can be kept high on the premise that the defrosting effect is guaranteed, and good air conditioning use experience is provided for users.

Further, the compressor operation frequency F for determining the heating decay period₀The method comprises the following steps:

According to formula F₀＝1/2*(F_{Operation max}+F_{Run min}) Calculating F₀. The duration of the heating decay period is short, and F is calculated by adopting a method for calculating an average value₀Can be made ofThe technical difficulty is reduced, and the accuracy of determining the frequency is improved.

Further, said is according to T_ARange determination of (F)_{Initial correction}The values of (a) include:

by setting T_ATemperature interval table to determine F_{Initial correction}The value of (c). More specifically, F_{Initial correction}And T_AThe temperature interval table of values of (a) is shown in table 1:

TABLE 1F_{Initial correction}And T_ATemperature interval table

	T_A≥-5℃	-5℃＜T_A≤-10℃	-10℃＜T_A≤-15℃	T_A＜-15℃
					F_{Initial correction}	F_{Initial correction 00}	F_{Initial correction 01}	F_{Initial correction 02}	F_{Initial correction 03}

F_{Initial correction}∈[0,10HZ]In addition, F_{Initial correction 00}＝0，F_{Initial correction 01}≤F_{Initial correction 02}≤F_{Initial correction 03}. From the above table, it can be seen that the temperature T when the outdoor coil enters the defrosting mode_AAbove-5 ℃, the operating frequency of the compressor need not be corrected. When T is_AWhen the temperature is lower than minus 5 ℃, the frost layer of the outdoor side coil pipe is thicker, and the running frequency of the compressor needs to be corrected so as to improve the defrosting effect. In practical application, T_AThe lower the correction, the larger the correction, in practice, F_{Initial correction}In the range of 0-10 HZ.

Further, the operation frequency correction amount F of the compressor in the middle period of defrosting is determined_{Mid-term correction}The method comprises the following steps:

by setting t₁、△T₁Interval table to determine F together_{Mid-term correction}The value of (c). Specifically, F_{Mid-term correction}And t₁、△T₁The temperature interval table of values of (a) is shown in table 2:

TABLE 2F_{Mid-term correction}And t₁、△T₁Temperature interval table

	t₁≤60s	60s＜t₁≤120s	120s＜t₁≤180s	t₁＞180s
					△T₁≤2℃	F_{Mid-term correction 00}	F_{Middle term correction 01}	F_{Medium term correction 02}	F_{Middle term correction 03}
2℃＜△T₁≤4℃	F_{Medium term correction 10}	F_{Middle term correction 11}	F_{Medium term correction 12}	F_{Middle term correction 13}
					△T₁＞4℃	F_{Middle term correction 20}	F_{Medium term correction 21}	F_{Medium term correction 22}	F_{Middle term correction 23}

To ensure defrosting effect and comfort indoors, F_{Mid-term correction}It is necessary to determine the duration of the initial period of defrosting and the temperature change in the room during the initial period of defrosting. In the above table, { F_{Mid-term correction 00}，…，F_{Middle term correction 23}The corrected value of the running frequency of the compressor under different conditions is as follows:

when Δ T₁At most 2 deg.C, indicating the initial stage of defrosting, as F_{Initial stage}The frequency is used for defrosting, and the indoor temperature reduction amplitude is small. Therefore, the frequency of the compressor can be properly increased according to the running time of the defrosting initial stage so as to ensure the defrosting speed; the parameter value range is as follows: f is not more than 10HZ_{Mid-term correction 00}≤F_{Middle term correction 01}≤F_{Medium term correction 02}≤F_{Middle term correction 03}≤20HZ；

When 2 ℃ is <. DELTA.T₁Not more than 4 ℃, which indicates that the indoor temperature has a certain degree of amplitude reduction in the initial stage of defrosting, and is taken into consideration for defrostingSpeed and comfort in the room, according to t₁Is frequency corrected, at this time:

0HZ≤F_{medium term correction 10}≤F_{Middle term correction 11}≤F_{Medium term correction 12}≤F_{Middle term correction 13}≤10HZ；

When Δ T₁And the temperature is higher than 4 ℃, which indicates that the indoor temperature has a large reduction amplitude at the moment, and the indoor comfort is considered preferentially, at the moment: -10 HZ.ltoreq.F_{Middle term correction 23}≤F_{Medium term correction 22}≤F_{Medium term correction 21}≤F_{Middle term correction 20}≤0HZ。

Further, said is according to T_CRange determination of (F)_{End stage correction}The values of (a) include:

by setting T_CTemperature interval table to determine F_{End stage correction}The value of (c). More specifically, F_{End stage correction}And T_CThe temperature interval table of (a) is shown in table 3:

TABLE 3F_{End stage correction}And T_CTemperature interval table

	0℃＜T_C≤2℃	2℃＜T_C≤4℃	4℃＜T_C≤6℃	T_C＞6℃
					F_{End stage correction}	F_{End stage correction 00}	F_{End stageCorrection 01}	F_{End stage correction 02}	F_{End stage correction 03}

In the last stage of defrosting, the frost layer of the outdoor heat exchanger is basically melted completely, and the temperature T of the outer tube at the last stage is reached_CCan reflect the degree of defrosting according to T_CIn the interval pair F_{End stage correction}Taking a value of F_{End stage correction}∈[-10HZ,0HZ]. Wherein-10 HZ is less than or equal to F_{End stage correction 03}≤F_{End stage correction 02}≤F_{End stage correction 01}≤F_{End stage correction 00}≤0HZ。

As can be seen from the above table, F_{End stage correction 03}The negative value of (a) is because the frost layer on the outdoor side coil has been substantially melted away at the end of the defrost, and it is more desirable to keep the indoor temperature within a more comfortable range, and therefore it is desirable to reduce the operating frequency of the compressor. T is_CThe larger the temperature of (a), the faster the temperature of the outdoor side coil rises at the end of defrosting, and the larger the absolute value of the amount to be corrected. Thus, in various stages, F_{End stage correction}Has the following relationship: -10 HZ.ltoreq.F_{End stage correction 03}≤F_{End stage correction 02}≤F_{End stage correction 01}≤F_{End stage correction 00}≤0HZ。

Referring to fig. 6, the present invention further provides an air conditioning system, which includes a compressor 2, an outdoor heat exchanger 1, an indoor heat exchanger 4, a throttling device, a four-way valve 3, and a controller, wherein the compressor 2, the outdoor heat exchanger 1, the indoor heat exchanger 4, the throttling device, and the four-way valve 3 form a closed refrigeration cycle loop, and the controller can execute the above-mentioned defrosting frequency control method.

The air conditioning system can ensure the defrosting effect and simultaneously can maintain better indoor comfort level, and can provide better air conditioning use experience for users.

The following describes the defrosting frequency control method according to the present application with specific examples:

and the operator selects the defrosting mode or the air conditioning system automatically detects that the frost layer of the outdoor coil pipe passes through, and then the defrosting mode is started.

After the air conditioning system enters a defrosting mode, the controller acquires the maximum operating frequency F of the compressor in the heat attenuation period_{Operation max}With minimum operating frequency F_{Run min}And F is obtained by calculation₀. Meanwhile, the controller judges the temperature T of the copper pipe of the outdoor heat exchanger measured by the temperature sensor_AIs within a range of, well-defined F_{Initial correction}The value of (c). T as measured at this time_AAt a temperature of-3 ℃ F_{Initial correction}If 0, the compressor is driven by F₀Is operated at the defrosting initial stage. Compressor with F₀After the running frequency of the heat exchanger is operated for a period of time, the temperature T of the copper pipe of the heat exchanger at the outdoor side is_AThe temperature of (2) rises from point a to point B, and the temperature sensor detects the temperature change and adjusts the operating frequency of the compressor again. The adjustment is carried out by measuring the duration t of the initial stage of defrosting₁And the amount of change DeltaT in the indoor temperature during defrosting₁Determining F from the values of both_{Mid-term correction}The value of (c). As measured by Δ T₁< 2 ℃ and duration t of the initial stage of defrosting₁Less than 60s, then F_{Mid-term correction}Has a value of F_{Mid-term correction 00}At this time F_{Middle stage}Is taken as F_{Middle stage}＝F_{Mid-term correction 00}+F_{Initial stage}. In this application, F is_{Mid-term correction 00}、F_{Middle term correction 01}、F_{Medium term correction 02}、F_{Medium term correction 10}、F_{Middle term correction 11}、F_{Medium term correction 12}The values of (a) are obtained by experimental data summarization or experience, and the value ranges of the values are different for different air conditioning systems.

Compressor with F_{Middle stage}The frequency of the heat exchanger is operated for a period of time, and the temperature of the copper pipe of the outdoor side heat exchanger is controlled by T_BUp to T_CAt which point the frequency of the compressor will change again. Controller obtains T_CAccording to T, temperature of_CTemperature range table of (1) determining_{End stage correction}Value of (A). Such as T at this time_CValue of < T at 0 ℃_CAt a temperature of not more than 2 ℃, F_{End stage correction}Has a value of F_{End stage correction 00}At this time F_{End stage}＝F₀+F_{End stage correction 00}Compressor with F_{End stage}And the defrosting mode is exited after the frequency of the defrosting mode is operated for a period of time, and defrosting is finished. Because the method adjusts the running frequency of the compressor according to the actual environment temperature and different conditions of each defrosting stage in different defrosting stages, the method can ensure the defrosting effect and can maintain the indoor environment temperature within a comfortable range.

The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. Those skilled in the art should also appreciate that the acts and modules referred to in the specification are not necessarily required in the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application may be sequentially adjusted, combined, and deleted according to actual needs, and the modules in the device of the embodiment of the present application may be combined, divided, and deleted according to actual needs.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems and methods according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A defrost frequency control method, comprising:

2. A defrost frequency control method as in claim 1 wherein:

the operation frequency F of the compressor for determining the heating decay period₀The method comprises the following steps:

obtaining the maximum operation frequency F of the compressor in the heating decay period_{Operation max}And a minimum operating frequency F_{Operation ofmin}；

3. A defrost frequency control method as in claim 1 wherein:

the operation frequency correction F of the compressor at the initial stage of defrosting is determined_{Initial correction}The method comprises the following steps:

4. A defrost frequency control method as in claim 3 wherein:

said according to T_ARange determination of (F)_{Initial correction}The values of (a) include:

5. A defrost frequency control method as in claim 1 wherein:

the operation frequency correction F of the compressor in the middle stage of defrosting is determined_{Mid-term correction}The method comprises the following steps:

recording the operation time t at the initial stage of defrosting₁；

6. A defrost frequency control method as in claim 1 wherein:

determining a defrost end compressor operating frequency correction F_{End stage correction}The method comprises the following steps:

7. A defrost frequency control method as defined in claim 6, wherein:

said according to T_CRange determination of (F)_{End stage correction}The values of (a) include:

8. A defrost frequency control method as claimed in any one of claims 1-7, wherein:

said F_{Initial stage}The value of (a) is equal to or less than the maximum operating frequency during the heating process of the compressor.

9. A defrost frequency control method as claimed in any one of claims 1-7, wherein:

said F_{Initial stage}The determination method comprises the following steps:

F_{initial stage}＝F₀+F_{Initial correction}；

Said F_{Middle stage}The determination method comprises the following steps:

F_{middle stage}＝F₀+F_{Mid-term correction}；

Said F_{End stage}The determination method comprises the following steps:

F_{end stage}＝F₀+F_{End stage correction}。

10. The utility model provides an air conditioning system, includes compressor, outdoor side heat exchanger, indoor side heat exchanger, throttling arrangement, cross valve and controller, the compressor outdoor side heat exchanger indoor side heat exchanger throttling arrangement and the cross valve constitutes closed refrigeration cycle return circuit, its characterized in that: the controller may perform the defrost frequency control method of any of claims 1-9.