CN107023963A - A kind of air conditioner and control method - Google Patents

Abstract

The invention discloses an air conditioner and a control method, belonging to the technical field of air conditioners. The air conditioner has a variable-capacity compressor, and the operation modes of the variable-capacity compressor include two-stage mode and two-cylinder mode. The indoor unit of the air conditioner includes two heat exchange units; the control method includes: obtaining indoor temperature, indoor humidity, and target cooling temperature and the target indoor humidity; control the air conditioner to operate in a double-cylinder mode; and control the first heat exchange unit to operate in a cooling mode, and the second heat exchange unit to operate in a dehumidification mode. The control method of the present invention can control the variable-capacity compressor of the air conditioner to operate in a double-cylinder mode in summer when the indoor temperature and humidity are high, and control the two heat exchange units to perform refrigeration and dehumidification according to the temperature difference and humidity difference. In this way, the refrigerant output by the variable capacity compressor can meet the cooling and dehumidifying refrigerant volume requirements of the two heat exchange units of the air conditioner, ensuring that the air conditioner can operate with the best energy efficiency.

Description

An air conditioner and its control method

technical field

The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method.

Background technique

Conventional air conditioners mostly use mechanical compressors to increase the temperature and pressure of the refrigerant, such as piston compressors, screw compressors, centrifugal compressors, linear compressors, etc. According to the number of compression cylinders inside the compressor, It can be divided into single-cylinder compressors, double-cylinder compressors and multi-cylinder compressors. Among them, for double-cylinder and multi-cylinder compressors with not less than one cylinder, the compression process is based on the connection between multiple cylinders. In order, the refrigerant is compressed in multiple stages in sequence. When the air conditioner is in normal operation, the compressor can only increase the temperature and pressure of the refrigerant according to a fixed single compression sequence mode. However, due to the influence of various factors such as outdoor ambient temperature and indoor temperature, under different working conditions, the air conditioner Air conditioners have different requirements on the operating frequency and compression efficiency of their compressors. Therefore, conventional compressors often have useless power consumption when operating in a single compression mode, and cannot reach the best energy-efficient operating state of the air conditioner.

Contents of the invention

The invention provides an air conditioner and a control method, aiming at improving the working energy efficiency of the air conditioner. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. This summary is not an overview, nor is it intended to identify key/critical elements or delineate the scope of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

According to the first aspect of the present invention, a control method of an air conditioner is provided. The control method includes: obtaining indoor temperature, indoor humidity, and the target cooling temperature and target indoor humidity set by the user; When the indoor temperature threshold and the indoor humidity are greater than the preset indoor humidity threshold, the air conditioner is controlled to operate in a dual-cylinder mode, wherein the dual-cylinder mode includes the two compression cylinders of the variable capacity compressor of the air conditioner separately compressing the refrigerant Operation mode: determine the first temperature difference between the indoor temperature and the target cooling temperature, and determine the first humidity difference between the indoor humidity and the target indoor humidity; when the first temperature difference is greater than the preset temperature difference threshold, and the first humidity difference is greater than the preset When the humidity difference threshold is set, the first heat exchange unit is controlled to operate in cooling mode, and the second heat exchange unit is controlled to operate in dehumidification mode.

Further, the control method also includes: determining the second temperature difference between the indoor temperature and the indoor temperature threshold; determining the second humidity difference between the indoor humidity and the indoor humidity threshold; adjusting the variable capacity according to the second temperature difference and the second humidity difference The operating frequency of the compressor.

Further, according to the second temperature difference and the second humidity difference, the operating frequency of the variable capacity compressor is adjusted. The process includes: when 0≤ΔT ₂ <T ₂ , and 0≤ΔRH ₂ <RH ₂ , control the variable capacity compressor The compressor operates at the first operating frequency H ₁ ; when T ₂ ≤ ΔT ₂ , and RH ₂ ≤ ΔRH ₂ , control the variable capacity compressor to operate at the second operating frequency H ₂ ; where ΔT ₂ is the second temperature difference, ΔRH ₂ is the second humidity difference, T ₂ is the preset first temperature threshold, RH ₂ is the preset first humidity threshold, H ₁ <H ₂ .

Further, the control method further includes: determining a third temperature difference between the first temperature difference and the temperature difference threshold; determining a third humidity difference between the first humidity difference and the humidity difference threshold; according to the third temperature difference and the first humidity difference The three humidity differences adjust the speed of the driving fan of each heat exchange unit.

Further, according to the third temperature difference and the third humidity difference, the speed of the driving fan of each heat exchange unit is adjusted, the process includes: when 0≤ΔT ₃ <T ₃ , and 0≤ΔRH ₃ <RH ₃ , control The driving fan of the first heat exchange unit runs at the first speed R ₁₁ , and the driving fan of the second heat exchange unit runs at the third speed R ₂₁ ; when T ₃ ≤ ΔT ₃ , and RH ₃ ≤ ΔRH ₃ , control the first The driving fan of the heat exchange unit runs at the second speed _R12 , and the driving fan of the second heat exchange unit runs at the fourth speed _R22 ; where, _ΔT3 is the _third temperature difference, and T3 is the preset second temperature threshold , ΔRH ₃ is the third humidity difference, RH ₃ is the preset second humidity threshold, R ₁₁ <R ₁₂ , R ₂₁ <R ₂₂ .

According to the second aspect of the present invention, there is also provided an air conditioner, the air conditioner has a variable capacity compressor and a controller, the operating modes of the variable capacity compressor include two-stage mode and two cylinder mode, and the indoor unit of the air conditioner has at least It includes two heat exchange units, each heat exchange unit has a separate heat exchanger; the air conditioner also includes a temperature sensor for detecting indoor temperature and a humidity sensor for detecting indoor humidity; the controller is used to: obtain indoor temperature, indoor Humidity, and the target cooling temperature and target indoor humidity set by the user; determine the first temperature difference between the indoor temperature and the target cooling temperature, and determine the first humidity difference between the indoor humidity and the target indoor humidity; temperature threshold, and when the indoor humidity is greater than the preset indoor humidity threshold, the variable capacity compressor of the air conditioner is controlled to operate in a dual-cylinder mode, wherein the dual-cylinder mode includes two compression cylinders of the variable capacity compressor of the air conditioner to compress independently The operating mode of the refrigerant; and when the first temperature difference is greater than the preset temperature difference threshold and the first humidity difference is greater than the preset humidity difference threshold, the first heat exchange unit is controlled to operate in cooling mode, and the second heat exchange unit is controlled to operate in cooling mode. Dehumidification mode operates.

Further, the air conditioner includes an outdoor unit, and the outdoor unit includes a variable-capacity compressor assembly and an outdoor heat exchanger, and the variable-capacity compressor assembly includes a variable-capacity compressor and a first four-way valve; the outdoor heat exchanger includes a first refrigerant port and an outdoor heat exchanger. The second refrigerant port; the variable capacity compressor includes a first compression cylinder and a second compression cylinder, the first compression cylinder has a first air inlet and a first air outlet, and the second compression cylinder has a second air inlet and a second outlet The air port, wherein, the second air outlet of the second compression cylinder communicates with the exhaust port of the variable capacity compressor; the first four-way valve includes a valve body, a valve block arranged in a valve cavity in the valve body, and a first interface, The second interface, the third interface and the fourth interface, the valve block has a first valve position that communicates with the first interface and the second interface, communicates with the third interface and the fourth interface, communicates with the second interface and the third interface, and blocks the first valve position. The second valve position of the first port and the fourth port; wherein, the second port communicates with the second air inlet, the third port communicates with the first air outlet, and the fourth port communicates with the exhaust port; control the air conditioner The variable capacity compressor operates in a two-cylinder mode, including: the valve block controlling the first four-way valve is switched to the first valve position.

Further, the outdoor unit also includes a second four-way valve and a third four-way valve, and a first gas-liquid separator and a second gas-liquid separator; the indoor unit includes a first heat exchange unit and a second heat exchange unit, wherein , the first heat exchange unit includes a first indoor heat exchanger, and the second heat exchange unit includes a second indoor heat exchanger; the first indoor heat exchanger is separated from the outdoor heat exchanger and the first gas-liquid through the second four-way valve The device and the variable capacity compressor are connected to form the first refrigerant circulation flow path; wherein, the first indoor heat exchanger includes the first cold coal port and the second cold coal port; the first gas-liquid separator includes the first inlet and the second One outlet; the second four-way valve includes a valve body, a valve block arranged in a valve cavity in the valve body, and a first port, a second port, a third port and a fourth port, and the valve block has a connection between the first port and the second port. port, the first valve position connected to the third port and the fourth port, the second port connected to the second port and the third port, and the second valve position connected to the first port and the fourth port; the first port of the second four-way valve is connected to the second port The first cold coal port of an indoor heat exchanger is connected, the second port is connected with the first inlet of the first gas-liquid separator, the third port is connected with the first cold coal port of the outdoor heat exchanger, and the fourth port is connected with the transformer The exhaust port of the capacity compressor is connected; the second cold coal port of the first indoor heat exchanger is connected with the second cold coal port of the outdoor heat exchanger; the first outlet of the first gas-liquid separator is connected with the first four-way valve connected to the first interface.

Further, the second indoor heat exchanger is connected with the outdoor heat exchanger, the second gas-liquid separator, and the variable capacity compressor through the third four-way valve to form a second refrigerant circulation flow path; wherein, the second indoor heat exchanger The device includes a first cold coal port and a second cold coal port; the second gas-liquid separator includes a second inlet and a second outlet; the third four-way valve includes a valve body, a valve block arranged in a valve cavity in the valve body, and The first port, the second port, the third port and the fourth port, the valve block has a first valve position that communicates with the first port and the second port, communicates with the third port and the fourth port, and communicates with the second port and the third port , the second valve position connecting the first port and the fourth port; the first port of the third four-way valve is connected with the first cold coal port of the second indoor heat exchanger, and the second port is connected with the second gas-liquid separator The second inlet is connected, the third interface is respectively connected with the first cold coal port and the second cold coal port of the outdoor heat exchanger, and the fourth port is connected with the exhaust port of the variable capacity compressor; the first port of the second indoor heat exchanger The second cold coal port is connected to the second cold coal port of the outdoor heat exchanger; the second outlet of the second gas-liquid separator is connected to the first air inlet of the first compression cylinder; the third port of the third four-way valve A first solenoid valve is installed on the refrigerant pipeline between the first cold coal port of the outdoor heat exchanger, and a refrigerant pipeline between the third port of the third four-way valve and the second cold coal port of the outdoor heat exchanger A second solenoid valve is provided; a third solenoid valve is provided on the refrigerant pipeline between the second cold coal port of the second indoor heat exchanger and the second cold coal port of the outdoor heat exchanger; A first throttling valve is set on the refrigerant pipeline between the second cold coal port of the second indoor heat exchanger and the second cold coal port of the outdoor heat exchanger. A second throttling valve is arranged on the refrigerant pipeline between the cold coal ports.

The control method of the present invention can control the variable-capacity compressor of the air conditioner to operate in a double-cylinder mode in summer when the indoor temperature and humidity are high, and control the two heat exchange units to perform refrigeration and dehumidification according to the temperature difference and humidity difference. In this way, the refrigerant output by the variable capacity compressor can meet the cooling and dehumidifying refrigerant volume requirements of the two heat exchange units of the air conditioner, ensuring that the air conditioner can operate with the best energy efficiency.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a flowchart of a control method of the present invention shown according to an exemplary embodiment;

Fig. 2 is a schematic structural diagram of an air conditioner according to an exemplary embodiment of the present invention.

Among them, 1. Outdoor unit;

11. Outdoor heat exchanger; 111. The first cold coal port; 112. The second cold coal port;

12, variable capacity compressor; 121, first compression cylinder; 122, second compression cylinder; 123, first port; 124, second port; 125, third port; 126, fourth port; 127, exhaust port ;

1211, the first air inlet; 1212, the first air outlet;

1221, the second air inlet; 1222, the second air outlet;

Since the first four-way valve, the second four-way valve and the third four-way valve are all arranged on multiple interfaces, the present invention uses different reference signs to distinguish multiple interfaces with the same name of different four-way valves, specifically as follows:

13. The first four-way valve; 131. The first port; 132. The second port; 133. The third port; 134. The fourth port;

14. The second four-way valve: 141, the first interface; 142, the second interface; 143, the third interface; 144, the fourth interface;

15. The third four-way valve; 151. The first port; 152. The second port; 153. The third port; 154. The fourth port;

16. The first gas-liquid separator; 161. The first inlet; 162. The first outlet;

17. The second gas-liquid separator; 171. The second inlet; 162. The second outlet;

181. The first refrigerant branch; 182. The second refrigerant branch;

191, the first solenoid valve; 192, the second solenoid valve; 193, the third solenoid valve;

2. Indoor unit;

Since the outdoor heat exchanger, the first indoor heat exchanger and the second indoor heat exchanger are all arranged in multiple cold coal ports, the present invention uses different reference signs for multiple refrigerant ports with the same name in different heat exchangers be distinguished as follows:

21. The first indoor heat exchanger; 211. The first refrigerant port; 212. The second cold coal port;

22. The second indoor heat exchanger; 221. The first cold coal port; 222. The second refrigerant port;

23. The first throttle valve; 24. The second throttle valve.

detailed description

The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. Herein, various embodiments may be referred to individually or collectively by the term "invention", which is for convenience only and is not intended to automatically limit the scope of this application if in fact more than one invention is disclosed. A single invention or inventive concept. Herein, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without requiring or implying any actual relationship or relationship between these entities or operations. order. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method or apparatus comprising a set of elements includes not only those elements but also other elements not expressly listed elements, or also include elements inherent in such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method or apparatus comprising said element. Various embodiments herein are described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of the various embodiments may be referred to each other. As for the methods, products, etc. disclosed in the examples, since they correspond to the methods disclosed in the examples, the description is relatively simple, and for relevant details, please refer to the description of the methods.

As shown in Figure 1, the present invention discloses a control method of an air conditioner, which can be used to control the air conditioner to perform cooling and dehumidification operations on the indoor environment under high temperature and high humidity conditions in summer. The steps of the control method specifically include: S101, obtaining indoor temperature, indoor humidity, and the target cooling temperature and target indoor humidity set by the user; S102, when the indoor temperature is greater than the preset indoor temperature threshold, and the indoor humidity is greater than the preset indoor humidity threshold, control the air conditioner to operate in dual-cylinder mode Operation, wherein the double cylinder mode includes the operation mode in which the two compression cylinders of the variable capacity compressor of the air conditioner independently compress the refrigerant; S103, determine the first temperature difference between the indoor temperature and the target cooling temperature, and determine the indoor humidity and the target indoor humidity The first humidity difference; S104. When the first temperature difference is greater than the preset temperature difference threshold and the first humidity difference is greater than the preset humidity difference threshold, control the first heat exchange unit to operate in cooling mode, and the second heat exchange unit The heat unit operates in dehumidification mode. The two heat exchange units of the air conditioner can cool and dehumidify the indoor environment by running the cooling mode and the dehumidification mode respectively, and improve the user's comfort.

In the above control method, the air conditioner uses a variable capacity compressor to compress the refrigerant. In an embodiment, the variable capacity compressor is a two-cylinder compressor, and its operation modes include two-stage mode and two-cylinder mode. Among them, the two-stage mode is that the refrigerant flows through the two compression cylinders of the compressor for compression, which is suitable for the working conditions with small temperature difference and small humidity difference; the two-cylinder mode is that the refrigerant flows through the two compression cylinders of the compressor respectively Compression, suitable for working conditions with large temperature difference and high humidity.

At the same time, the indoor unit of the air conditioner needs to perform cooling and dehumidification operations on the indoor environment at the same time. Since the two operations of cooling and dehumidification have different requirements on the amount of refrigerant and the temperature of the refrigerant, the indoor unit of the air conditioner of the present invention includes at least two heat exchange units. , each heat exchange unit has a separate heat exchanger and a driving fan, which can be used to perform the above cooling and dehumidification operations respectively, so that the cooling operation and dehumidification operation of the air conditioner do not interfere with each other.

The indoor temperature acquired in step S101 may be detected by a temperature sensor installed in the indoor environment, and the indoor humidity may be detected by a humidity sensor installed in the indoor environment. In one embodiment, the indoor temperature is the real-time indoor temperature detected by the temperature sensor, and the indoor humidity is the real-time indoor humidity detected by the humidity sensor. In another embodiment, in order to reduce the interference effect caused by instantaneous temperature and humidity changes, the indoor temperature can also be the average indoor temperature within a certain set period of time, for example, the temperature sensor detects the indoor temperature 5 times within 5 minutes Ambient temperature, each detection interval is 1 minute, then the average value of these 5 indoor ambient temperatures can be used as the indoor temperature applied by the control method of the present invention; in the same way, the indoor humidity can also be detected in the above-mentioned manner, and its average value can be used as the applied indoor temperature of the control method. Applied room humidity.

The target cooling temperature and target indoor humidity obtained in step S101 are the cooling temperature and humidity set by the user through the remote control or the display control panel on the air conditioner body.

In an embodiment of the present invention, the indoor temperature threshold and indoor humidity threshold preset in step S102 are used to determine the amount of refrigerant expected to be required for the operation of the air conditioner. When the indoor temperature is greater than the indoor temperature threshold and the indoor humidity is greater than the indoor humidity threshold , the air conditioner needs to cool and dehumidify the indoor environment separately, and the air conditioner requires a large amount of refrigerant to operate, so the variable capacity compressor of the air conditioner needs to operate in a mode that outputs more refrigerant.

Therefore, in step S102, when the indoor temperature is greater than the preset indoor temperature threshold and the indoor humidity is greater than the preset indoor humidity threshold, the variable capacity compressor is controlled to operate in a dual-cylinder mode, and the two compression cylinders respectively compress the refrigerant, which can Increase the amount of refrigerant output to the refrigerant circulation system of the air conditioner, so that the amount of refrigerant can meet the needs of the air conditioner, and improve the working efficiency of the air conditioner.

In the embodiment, the first temperature difference determined in step S103 is the temperature difference between the indoor temperature and the target cooling temperature. For example, if the indoor ambient temperature is 32°C and the target cooling temperature set by the user is 27°C, then the first temperature difference The value is the difference between the two, that is, 5°C. In order to facilitate the comparison of the temperature difference in the subsequent control steps, the first temperature difference calculated in this case generally takes the absolute value of the indoor temperature and the target refrigeration temperature, so that the first temperature difference is Positive value. Similarly, the first humidity difference can also be calculated and determined by referring to the above method, which will not be repeated here.

In the embodiment, in order to facilitate the air conditioner to enable different operation modes for the two heat exchange units according to the current working conditions, in step S104, when the first temperature difference is greater than the preset temperature difference threshold, and the first humidity difference is greater than the preset When the humidity difference threshold is reached, the first heat exchange unit is controlled to operate in refrigeration mode, and the second heat exchange unit is operated in dehumidification mode, and the opening of flow valves in different heat exchange units can be controlled to adjust the flow rate input into the two heat exchange units. The amount of refrigerant, so as to meet the refrigerant amount requirements of the two heat exchange units in cooling mode or dehumidification mode.

The temperature difference threshold above is used to judge the degree of temperature difference between the indoor temperature and the target cooling temperature. The larger the first temperature difference calculated from the indoor temperature and the target cooling temperature, the greater the temperature difference between the indoor temperature and the target cooling temperature. The greater the temperature difference to be regulated by the air conditioner, it is necessary to control at least one heat exchange unit of the air conditioner to operate in cooling mode, so as to perform cooling and cooling operations on the indoor environment; The amount of refrigerant is also more, so the operation of the variable capacity compressor in double cylinder mode can be adapted to the current working conditions. Similarly, the humidity difference threshold can also be used to determine the degree of humidity difference between the indoor humidity and the target indoor humidity, and then control at least one heat exchange unit of the air conditioner to operate in the dehumidification mode when the humidity difference is large, so as to further improve the indoor environment. Dehumidification operation. The air conditioner in the embodiment includes two heat exchange units, so in step S104, the first heat exchange unit is controlled to operate in the cooling mode, and the second heat exchange unit is controlled to operate in the dehumidification mode, so as to cool and dehumidify the indoor environment respectively.

In one embodiment of the present invention, the steps of the control method further include: determining the second temperature difference between the indoor temperature and the indoor temperature threshold; determining the second humidity difference between the indoor humidity and the indoor humidity threshold; according to the second temperature difference and the first Two humidity difference, adjust the working frequency of variable capacity compressor. The aforementioned indoor temperature threshold and indoor humidity threshold are mainly used to judge the amount of refrigerant expected to be required for the operation of the air conditioner, and then determine the operation mode of the variable capacity compressor. The impact on the refrigerant output of the air conditioner includes not only the operation mode of the variable capacity compressor, but also the operation mode of the variable capacity compressor. It also includes the operating frequency of the variable capacity compressor, so the present invention can adjust the operating frequency of the compressor by judging the second temperature difference between the indoor temperature and the indoor temperature threshold, and the second humidity difference between the indoor humidity and the indoor humidity threshold; The greater the temperature difference and the greater the second humidity difference, the greater the amount of refrigerant required for the operation of the air conditioner. Therefore, increasing the operating frequency of the compressor can effectively improve the refrigerant output efficiency.

In a specific embodiment, according to the second temperature difference and the second humidity difference, the operating frequency of the variable capacity compressor is adjusted, and the process includes:

When 0≤ΔT ₂ <T ₂ , and 0≤ΔRH ₂ <RH ₂ , control the variable capacity compressor to run at the first operating frequency H ₁ ;

When T ₂ ≤ΔT ₂ , and RH ₂ ≤ΔRH ₂ , control the variable capacity compressor to run at the second operating frequency H ₂ ;

Among them, ΔT ₂ is the second temperature difference, ΔRH ₂ is the second humidity difference, T ₂ is the preset first temperature threshold, the value range is 3°C to 5°C, RH ₂ is the preset first humidity threshold , the value range is 5%-10%, H ₁ <H ₂ .

In one embodiment of the present invention, the steps of the control method further include: determining a third temperature difference between the first temperature difference and the temperature difference threshold; determining a third humidity difference between the first humidity difference and the humidity difference threshold ; According to the third temperature difference and the third humidity difference, adjust the speed of the driving fan of each heat exchange unit. The aforementioned temperature difference threshold is mainly used to judge the degree of temperature difference between the indoor temperature and the target cooling temperature, and the humidity difference threshold is mainly used to judge the degree of humidity difference between the indoor humidity and the target indoor humidity. , the air volume flowing through different heat exchange units can be adjusted by controlling the speed of the driving fan of the heat exchange unit, and then the cooling efficiency or dehumidification efficiency of the heat exchange unit can be adjusted.

In a specific embodiment, according to the third temperature difference and the third humidity difference, the speed of the driving fan of each heat exchange unit is adjusted, and the process includes:

When 0≤ΔT ₃ <T ₃ , and 0≤ΔRH ₃ <RH ₃ , control the drive fan of the first heat exchange unit to run at the first speed R ₁₁ , and control the drive fan of the second heat exchange unit to run at the third speed R ₂₁ run;

When T ₃ ≤ ΔT ₃ , and RH ₃ ≤ ΔRH ₃ , control the driving fan of the first heat exchange unit to run at the second speed R ₁₂ , and control the driving fan of the second heat exchange unit to run at the fourth speed R ₂₂ ;

Among them, ΔT ₃ is the third temperature difference, T ₃ is the preset second temperature threshold, R ₁₁ < R ₁₂ , that is, the larger the third temperature difference, the faster the speed of the driving fan of the heat exchange unit in the cooling mode. High; ΔRH ₃ is the third humidity difference, RH ₃ is the preset second humidity threshold, R ₂₁ < R ₂₂ , that is, the greater the third humidity difference, the corresponding driving fan of the heat exchange unit in dehumidification mode The higher the speed.

In some other embodiments of the present invention, it is also disclosed that when the air conditioner is operating in summer and winter conditions, the operating mode of the variable capacity compressor is controlled according to parameters such as indoor temperature, indoor humidity, outdoor temperature and outdoor humidity, and two A variety of method processes for the working mode of a heat exchange unit are described below in conjunction with different embodiments:

In the first embodiment of the present invention, in the summer working condition, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to parameters such as indoor temperature and indoor humidity. The specific process includes: obtaining the indoor temperature, Indoor humidity, as well as the target cooling temperature and target indoor humidity set by the user; when the indoor temperature is greater than the preset indoor temperature threshold, control the variable capacity compressor to run in dual-cylinder mode; determine the first temperature difference between the indoor temperature and the target cooling humidity value, determine the first humidity difference between the indoor humidity and the target indoor humidity; when the first temperature difference is greater than the preset temperature difference threshold, and the first humidity difference is not greater than the preset humidity difference threshold, control the two heat exchange units Both run in cooling mode. The above control method can control the two heat exchange units of the air conditioner to cool the indoor environment at the same time, so as to speed up the cooling efficiency of the air conditioner.

In the second embodiment of the present invention, in the summer working condition, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to parameters such as indoor temperature and indoor humidity. The specific process includes: obtaining the indoor temperature, Indoor humidity, as well as the target cooling temperature and target indoor humidity set by the user; when the indoor humidity is greater than the preset indoor humidity threshold, control the variable capacity compressor to run in a dual-cylinder mode; determine the first step between the indoor temperature and the target cooling humidity A temperature difference value, determine the first humidity difference between the indoor humidity and the target indoor humidity; when the first temperature difference is not greater than the preset temperature difference threshold, and the first humidity difference is greater than the preset humidity difference threshold, control the two switches The heat units are all run in dehumidification mode. The above control method can control the two heat exchange units of the air conditioner to dehumidify the indoor environment at the same time, so as to speed up the dehumidification efficiency of the air conditioner.

In the third embodiment of the present invention, in the summer working condition, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to parameters such as indoor temperature and indoor humidity. The specific process includes: obtaining the indoor temperature, Indoor humidity, as well as the target cooling temperature and target indoor humidity set by the user; when the indoor temperature is greater than the preset indoor temperature threshold, control the variable capacity compressor to run in dual-cylinder mode; determine the first temperature difference between the indoor temperature and the target cooling humidity value, determine the first humidity difference between the indoor humidity and the target indoor humidity; when the first temperature difference is greater than the preset temperature difference threshold, and the first humidity difference is not greater than the preset humidity difference threshold, control the two heat exchange units The periodic alternate operation is as follows: in the first mode, the first heat exchange unit operates in cooling mode, and the second heat exchange unit operates in air supply mode; in the second mode, both heat exchange units operate in cooling mode. The above-mentioned control method can control the two heat exchange units of the air conditioner to operate alternately in the mode of cooling and air supply, so as to speed up the cooling efficiency of the air conditioner, and at the same time make the air conditioner have the air supply effect of natural wind.

In the fourth embodiment of the present invention, in the summer working condition, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to parameters such as indoor temperature and indoor humidity. The specific process includes: obtaining the indoor temperature, Indoor humidity, as well as the target cooling temperature and target indoor humidity set by the user; when the indoor humidity is greater than the preset indoor humidity threshold, control the variable capacity compressor to run in dual-cylinder mode; determine the first temperature difference between the indoor temperature and the target cooling humidity value, determine the first humidity difference between the indoor humidity and the target indoor humidity; when the first temperature difference is not greater than the preset temperature difference threshold, and the first humidity difference is greater than the preset humidity difference threshold, control the two heat exchange units The periodic alternate operation is as follows: in the first mode, the first heat exchange unit operates in the dehumidification mode, and the second heat exchange unit operates in the air supply mode; in the second mode, both heat exchange units operate in the dehumidification mode. The above control method can control the two heat exchange units of the air conditioner to operate alternately in the mode of dehumidification and air supply, so that the dehumidification efficiency of the air conditioner can be accelerated, and at the same time, the air conditioner can have the air supply effect of natural wind.

In the fifth embodiment of the present invention, in summer working conditions, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to parameters such as indoor temperature, and the specific process includes: obtaining indoor temperature and setting by the user target cooling temperature; when the indoor temperature is not greater than the preset indoor temperature threshold, control the variable capacity compressor to run in two-stage mode; determine the first temperature difference between the indoor temperature and the target cooling humidity; when the first temperature difference is not greater than the preset When the temperature difference threshold is set, the first heat exchange unit is controlled to operate in the air supply mode, and the second heat exchange unit is controlled to operate in the cooling mode. The above control method can control the single heat exchange unit of the air conditioner to cool the indoor environment, so as to increase the cooling efficiency of the air conditioner, and at the same time, it can also make the air conditioner have the air supply effect of natural wind.

In the sixth embodiment of the present invention, in summer working conditions, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to indoor humidity and other parameters. The specific process includes: obtaining indoor humidity and user setting target indoor humidity; when the indoor humidity is not greater than the preset indoor humidity threshold, control the variable capacity compressor to run in a two-stage mode; determine the first humidity difference between the indoor humidity and the target indoor humidity; When it is greater than the preset humidity difference threshold, the first heat exchange unit is controlled to operate in the air supply mode, and the second heat exchange unit is controlled to operate in the dehumidification mode. The above control method can control the single heat exchange unit of the air conditioner to dehumidify the indoor environment, so as to increase the cooling efficiency of the air conditioner, and at the same time, make the air conditioner have the effect of natural wind.

In the seventh embodiment of the present invention, in the summer working condition, the operation mode of the variable capacity compressor and the work mode of the two heat exchange units are controlled according to indoor temperature and other parameters. The specific process includes: obtaining the indoor temperature and the user setting target cooling temperature and sleep period; when the indoor temperature is not greater than the preset indoor temperature threshold, control the variable capacity compressor to run in two-stage mode; determine the first temperature difference between the indoor temperature and the target cooling humidity; When the temperature difference threshold is not greater than the preset temperature difference, and the air conditioner is running in the sleep period, the first heat exchange unit is controlled to stop running, and the second heat exchange unit is operated in cooling mode. The above control method can control the single heat exchange unit of the air conditioner to cool the indoor environment to ensure that the indoor temperature can meet the comfort requirements of the user; and can stop the cooling or air supply operation of the first heat exchange unit during the sleep period of the user, thereby avoiding The problem that the user's sleep is affected due to the low temperature of the indoor environment.

In the eighth embodiment of the present invention, in summer working conditions, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to indoor humidity and other parameters. The specific process includes: obtaining indoor humidity and user setting target indoor humidity and sleep period; when the indoor humidity is not greater than the preset indoor humidity threshold, control the variable capacity compressor to run in a two-stage mode; determine the first humidity difference between the indoor humidity and the target indoor humidity; When the difference is not greater than the preset humidity difference threshold, and the air conditioner is running during the sleep period, the first heat exchange unit is controlled to stop running, and the second heat exchange unit is operated in a dehumidification mode. The above control method can control the single heat exchange unit of the air conditioner to dehumidify the indoor environment to ensure that the indoor temperature can meet the comfort requirements of the user; and it can stop the cooling or air supply operation of the first heat exchange unit during the sleep period of the user, so as to avoid The problem that the user's sleep is affected due to the low temperature of the indoor environment.

In the ninth embodiment of the present invention, in winter conditions, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to parameters such as indoor temperature and outdoor humidity. The specific process includes: obtaining the indoor temperature, Outdoor humidity, and the target heating temperature set by the user. When the outdoor humidity is greater than the preset outdoor humidity threshold, control the variable capacity compressor to run in dual-cylinder mode; determine the first temperature difference between the indoor humidity and the target heating temperature ; When the first temperature difference value is not greater than the preset temperature difference threshold, control the first heat exchange unit to operate in a heating mode, and the second heat exchange unit to stop operating. By running the heating mode, the first heat exchange unit of the air conditioner can heat the indoor environment and increase the temperature of the user, and at the same time reduce the frosting problem of the outdoor unit caused by the high humidity of the outdoor environment. . In addition, the present invention controls another heat exchange unit to stop running, which can reduce the power consumption of the air conditioner for heating operation and improve the energy efficiency of the air conditioner.

In the tenth embodiment of the present invention, in winter conditions, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to indoor temperature and other parameters, and the specific process includes: obtaining indoor temperature and user setting the target heating temperature; determine the first temperature difference between the indoor temperature and the target heating temperature; when the indoor temperature is not greater than the preset indoor temperature threshold, control the variable capacity compressor to operate in a dual-cylinder mode; and when the first temperature difference When it is greater than the preset temperature difference threshold, both heat exchange units are controlled to operate in the heating mode. The above control method can control the two heat exchange units of the air conditioner to heat the indoor environment at the same time, so as to speed up the heating efficiency of the air conditioner.

In the eleventh embodiment of the present invention, in winter conditions, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to parameters such as indoor temperature and outdoor temperature. The specific process includes: obtaining the indoor temperature and outdoor temperature; when the indoor temperature is not greater than the preset indoor temperature threshold, control the variable capacity compressor to run in dual-cylinder mode; and when the outdoor temperature reaches the frosting condition, control the first heat exchange unit to run in heating mode, The second heat exchange unit operates in the defrosting mode, wherein the indoor pipeline of the refrigerant circulation flow path of the heat exchange unit operating in the defrosting mode is blocked, and the refrigerant only flows through the heat exchanger of the outdoor unit. The first heat exchange unit of the air conditioner can achieve the effect of heating and heating the indoor environment by running the heating mode to improve the comfort of the user. At the same time, it controls the refrigerant flow path where the second heat exchange unit is located to defrost the outdoor unit. In order to reduce the frosting problem of the outdoor unit.

In the twelfth embodiment of the present invention, in winter conditions, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to indoor temperature and other parameters. set target heating temperature; when the indoor temperature is greater than the preset indoor temperature threshold, control the variable capacity compressor to run in two-stage mode; determine the first temperature difference between the indoor temperature and the target heating temperature; when the first temperature difference When the value is not greater than the preset temperature difference threshold, the first heat exchange unit is controlled to operate in the air supply mode, and the second heat exchange unit is controlled to operate in the heating mode. The two heat exchange units of the air conditioner operate in the heating mode and the air supply mode respectively, and can heat and supply air to the indoor environment when the indoor temperature exceeds the indoor temperature threshold in winter, so as to ensure that the indoor temperature can meet the user's comfort requirements .

In the thirteenth embodiment of the present invention, in winter conditions, the operating mode of the variable capacity compressor and the working modes of the two heat exchange units are controlled according to indoor temperature and other parameters. The specified target heating temperature and sleep period; when the indoor temperature is greater than the preset indoor temperature threshold, control the variable capacity compressor to run in two-stage mode; when the first temperature difference value is not greater than the preset temperature difference threshold, and the air conditioner is in When the sleep period is running, the first heat exchange unit is controlled to stop running, and the second heat exchange unit is operated in a heating mode. By running the heating mode, the heat exchange unit of the air conditioner can heat the indoor environment when the indoor temperature exceeds the indoor temperature threshold in winter to ensure that the indoor temperature can meet the user's comfort requirements; and it can stop the first heating during the user's sleep period. The heating or air supply operation of the heat exchange unit can avoid the problem of affecting the user's sleep due to the high indoor ambient temperature.

As shown in Figure 2, the present invention also provides an air conditioner, the air conditioner has a variable capacity compressor and a controller, the operation mode of the variable capacity compressor includes a two-stage mode and a double cylinder mode, and the indoor unit of the air conditioner includes at least Two heat exchange units, each heat exchange unit has a separate heat exchanger and driving fan; the controller controls the operation of the air conditioner according to the control method disclosed in the previous embodiment. In the embodiment, the controller is mainly used to: obtain Indoor temperature, indoor humidity, and the target cooling temperature and target indoor humidity set by the user; determine the first temperature difference between the indoor temperature and the target cooling temperature, and determine the first humidity difference between the indoor humidity and the target indoor humidity; when the indoor temperature is greater than When the preset indoor temperature threshold is set and the indoor humidity is greater than the preset indoor humidity threshold, the variable capacity compressor is controlled to operate in dual-cylinder mode; and when the first temperature difference is greater than the preset temperature difference threshold and the first humidity difference is greater than When the preset humidity difference threshold is reached, the first heat exchange unit is controlled to operate in cooling mode, and the second heat exchange unit is controlled to operate in dehumidification mode.

In an embodiment of the present invention, the controller is also used to: determine the second temperature difference between the indoor temperature and the indoor temperature threshold; and determine the second humidity difference between the indoor humidity and the indoor humidity threshold; The second temperature difference and the second humidity difference adjust the operating frequency of the variable capacity compressor.

In an embodiment of the present invention, the controller is used to: when 0≤ΔT ₂ <T ₂ , and 0≤ΔRH ₂ <RH ₂ , control the variable capacity compressor to run at the first operating frequency H ₁ ; when T ₂ ≤ ΔT ₂ , and when RH ₂ ≤ ΔRH ₂ , control the variable capacity compressor to run at the second operating frequency H ₂ ; where ΔT ₂ is the second temperature difference, ΔRH ₂ is the second humidity difference, and T ₂ is the preset The first temperature threshold, RH ₂ is a preset first humidity threshold, H ₁ <H ₂ .

In an embodiment of the present invention, the controller is further configured to: determine a third temperature difference between the first temperature difference and the temperature difference threshold; and determine a third humidity difference between the first humidity difference and the humidity difference threshold ; According to the third temperature difference and the third humidity difference, adjust the speed of the driving fan of each heat exchange unit.

In an embodiment of the present invention, the controller is used for: when 0≤ΔT ₃ <T ₃ , and 0≤ΔRH ₃ <RH ₃ , control the driving fan of the first heat exchange unit to run at the first rotational speed R ₁₁ , and the second The drive fan of the second heat exchange unit runs at the third speed R ₂₁ ; when T ₃ ≤ ΔT ₃ , and RH ₃ ≤ ΔRH ₃ , the drive fan of the heat exchange unit in cooling mode is controlled to run at the second speed R ₁₂ , and The driving fan of a heat exchange unit runs at the fourth speed R ₂₂ ; wherein, ΔT ₃ is the third temperature difference, T ₃ is the preset second temperature threshold, ΔRH ₃ is the third humidity difference, and RH ₃ is the preset The second humidity threshold, R ₁₁ <R ₁₂ , R ₂₁ <R ₂₂ .

At the same time, the controller of the present invention can also be used to control the air conditioner to run one or several related processes of the control methods disclosed in the aforementioned first to thirteenth embodiments.

In order to realize that the aforementioned controller can control the air conditioner to execute the above process, the present invention further explains the composition and structure of the specific components of the air conditioner:

The air conditioner includes an outdoor unit 1 and an indoor unit 2, wherein the outdoor unit 1 is installed outdoors for exchanging heat with the outdoor environment; Cooling, heating or dehumidification operations.

In one embodiment of the present invention, the outdoor unit 1 of the air conditioner mainly includes a variable capacity compressor assembly, an outdoor heat exchanger 11 and other components, wherein the variable capacity compressor assembly includes a variable capacity compressor 12 and a first four-way valve 13. The present invention realizes the mode switching of the variable capacity compressor 12 by switching different valve positions of the first four-way valve 13, thereby changing the capacity of the variable capacity compressor 12, so that the two-stage mode of the variable capacity compressor 12 and the two-cylinder The modes can respectively meet the refrigerant demand of the air conditioner under different working conditions.

In a specific embodiment, the variable capacity compressor 12 includes a first compression cylinder 121 and a second compression cylinder 122, both of which can independently compress the refrigerant. In other words, the cylinders of the two compression cylinders are not connected to each other. The present invention realizes the connection of the two compression cylinders through the first four-way valve 13, and when the first four-way valve 13 is in different valve positions, the two compression cylinders are respectively A dual-stage mode refrigerant flow path and a dual-cylinder mode refrigerant flow path are formed.

In the embodiment, the body of the variable capacity compressor 12 is provided with 5 ports for communicating with the external refrigerant pipeline, including the first port 123, the second port 124, the third port 125, the fourth port 126 and the exhaust port. port 127, wherein, the fourth port 126 is connected to the discharge port 127 inside the body of the variable capacity compressor 12, and the discharge port 127 is connected to the discharge pipeline of the compressor, so that the compressed refrigerant can flow along the discharge line. The air pipeline is input into the refrigerant circulation pipeline of the air conditioner; the first compression cylinder 121 has a first air inlet 1211 and a first air outlet 1212, the first air inlet 1211 is connected to the first port 123, and the second air outlet 1212 Connected to the second port 124; the second compression cylinder 122 has a second air inlet 1221 and a second air outlet 1222, wherein the second air inlet 1221 communicates with the third port 123, and the second air outlet 1222 communicates with the variable capacity The discharge port 127 of the compressor 12 is connected.

The structure of the first four-way valve 13 mainly includes a valve body, a valve block arranged in a valve cavity in the valve body, and a first interface 131, a second interface 132, a third interface 133 and a fourth interface 134. One port 131 and the second port 132, the first valve position connecting the third port 133 and the fourth port 134, the second port connecting the second port 132 and the third port 133, blocking the first port 131 and the fourth port 134 Valve position; wherein, the second port 132 communicates with the second air inlet 1221 of the second compression cylinder 122, the third port 132 communicates with the first air outlet 1211 of the first compression cylinder 121, and the fourth port 134 communicates with the second The four ports 126 communicate with the exhaust port 127 .

When the first four-way valve 13 is at the aforementioned first valve position, the variable capacity compressor 12 operates in a double-cylinder mode, and the flow paths of the refrigerant in the variable capacity compressor assembly include two: (1) the refrigerant to be compressed along the The first port 123 of the variable capacity compressor 12 flows in, and the refrigerant flows through the first port 123 of the variable capacity compressor 12 → the first air inlet 1211 → the first compression cylinder 121 → the first air outlet 1212 → the variable capacity compressor The second port 124 of 12→the third port 133 of the first four-way valve 13→valve cavity-the fourth port 134 of the first four-way valve 13→the fourth port 126 of the variable capacity compressor 12→the variable capacity compressor 12 In this refrigerant flow path, the refrigerant is once compressed by the first compression cylinder 121, and finally output to the refrigerant circulation flow path of the air conditioner through the exhaust port 127; (2) The refrigerant to be compressed is The first port 131 of the four-way valve 13 flows in, and the refrigerant flows through the first port 131 of the first four-way valve 13 → valve cavity → second port 132 of the first four-way valve 13 → the first port of the variable capacity compressor 12 Three ports 125→second air inlet 1221→second compression cylinder 122→second air outlet 1222→exhaust port 127 of variable capacity compressor 12. Compressed, and finally output to the refrigerant circulation flow path of the air conditioner through the exhaust port 127. In the above-mentioned two refrigerant flow paths, the two compression cylinders of the variable capacity compressor 12 can independently perform suction, compression and exhaust operations, which can effectively increase the compression amount of the refrigerant and increase the refrigerant output of the compressor. To meet the demand for refrigerant quantity when multiple heat exchange units of the indoor unit 2 perform operations such as cooling, heating or dehumidification.

When the first four-way valve 13 is at the aforementioned second valve position, the variable capacity compressor 12 operates in a two-stage mode, and the flow path of the refrigerant in the variable capacity compressor 12 is one: the refrigerant to be compressed travels along the variable capacity compressor. The first port 123 of 12 flows in, and the refrigerant flows through the first port 123 of the variable capacity compressor 12 → the first air inlet 1211 → the first compression cylinder 121 → the first air outlet 1222 → the second port of the variable capacity compressor 12 Port 124-third port 134 of the first four-way valve 13→valve cavity→second port 132 of the first four-way valve 13→third port 125 of variable capacity compressor 12→second air inlet 1221→second Compression cylinder 122 → the second air outlet 1222 of the second compression cylinder 122 → the exhaust port 127 of the variable capacity compressor 122. In this refrigerant flow path, the refrigerant is compressed once by the first compression cylinder 121 and then compressed by the second compression cylinder 122. The cylinder 122 performs secondary compression, and is finally output to the refrigerant circulation flow path of the air conditioner through the exhaust port 127 . In the above-mentioned refrigerant flow path, the two compression cylinders of the variable capacity compressor 12 perform operations such as air intake, compression, and exhaust successively, thereby realizing secondary compression of the refrigerant, which can effectively increase the compression ratio of the refrigerant to enhance indoor air flow. The heat exchange efficiency of the heat exchanger and the outdoor heat exchanger 11.

In an embodiment, the air conditioner of the present invention also includes a temperature sensor for detecting indoor temperature and a humidity sensor for detecting indoor humidity, and the temperature sensor and humidity sensor can transmit the detected indoor temperature and indoor humidity information to the controller device. In addition, the air conditioner also includes a humidity sensor for detecting outdoor humidity and a humidity sensor for detecting outdoor humidity. The temperature sensor and humidity sensor can transmit the detected outdoor temperature and outdoor humidity information to the controller.

The outdoor heat exchanger 11 includes a first refrigerant port 111 and a second refrigerant port 112, and the refrigerant flows into or out of the outdoor heat exchanger 11 through the first refrigerant port 111 and the second refrigerant port 112; In the dehumidification mode, the refrigerant discharged from the variable capacity compressor 12 flows in from the first cold coal port 111, and after exchanging heat with the outdoor environment in the outdoor heat exchanger 11, the refrigerant flows out from the second cold coal port 112 and flows to the indoor unit 2 The indoor heat exchangers of the two heat exchange units to continue to exchange heat with the indoor environment; when the air conditioner is running in the heating mode, the refrigerant discharged from the indoor heat exchangers of the two heat exchange units flows into the outdoor from the second cooling coal port 112 The heat exchanger 11 , after exchanging heat with the outdoor environment in the outdoor heat exchanger 11 , the refrigerant flows out from the first cooling coal port 111 and flows to the variable capacity compressor 12 to recompress the refrigerant by the variable capacity compressor 12 .

In the embodiment, the outdoor unit 1 further includes a second four-way valve 14 and a first gas-liquid separator 16 for use with the first heat exchange unit, and a third four-way valve for use with the second heat exchange unit. The through valve 15 and the second gas-liquid separator 17; the indoor unit 2 includes a first heat exchange unit and a second heat exchange unit, wherein the first heat exchange unit includes a first indoor heat exchanger 21 and a first driving fan, and the second The second heat exchange unit includes a second indoor heat exchanger 22 and a second driving fan, and the first indoor heat exchanger 21 and the second indoor heat exchanger 22 can separately exchange heat with the indoor environment.

Wherein, the first indoor heat exchanger 21 is connected with the outdoor heat exchanger 11 , the first gas-liquid separator 16 , and the variable capacity compressor 12 through the second four-way valve 14 to form a first refrigerant circulation flow path.

The structure and connection method of each component of the first refrigerant circulation flow path are as follows: the first indoor heat exchanger 21 includes a first cold coal port 211 and a second cold coal port 212; the first gas-liquid separator 16 includes a first inlet 161 and the first outlet 162; the second four-way valve 14 includes a valve body, a valve block arranged in a valve cavity in the valve body, and a first interface 141, a second interface 142, a third interface 143 and a fourth interface 144, the valve block It has a first valve position that communicates with the first port 141 and the second port 142, communicates with the third port 143 and the fourth port 144, communicates with the second port 142 and the third port 143, communicates with the first port 141 and the fourth port 144 Second valve position: the first port 141 of the second four-way valve 14 is connected to the first cold coal port 211 of the first indoor heat exchanger 21, and the second port 142 is connected to the first inlet 161 of the first gas-liquid separator 16 connection, the third interface 143 is connected to the first cold coal port 111 of the outdoor heat exchanger 11, the fourth interface 144 is connected to the exhaust port 127 of the variable capacity compressor 12; the second cold coal port of the first indoor heat exchanger 21 The port 212 is connected to the second cold coal port 112 of the outdoor heat exchanger 11 ; the first outlet 161 of the first gas-liquid separator 16 is connected to the first port 131 of the first four-way valve 13 .

When the first heat exchange unit of the air conditioner is operating in cooling mode or dehumidification mode, the valve block of the second four-way valve 14 is in the first valve position, and the refrigerant flow sequence of the first refrigerant circulation path is shown in the figure by the solid arrow Shown: exhaust port 127 of variable capacity compressor 12 → fourth port 144 of second four-way valve 14 → valve chamber of second four-way valve 14 → third port 143 of second four-way valve 14 → outdoor replacement The first cold coal port 111 of the heat exchanger 11 → the outdoor heat exchanger 11 → the second cold coal port 112 of the outdoor heat exchanger 11 → the second cold coal port 212 of the first indoor heat exchanger 21 → the first indoor heat exchange Device 21 → the first cold coal port 211 of the first indoor heat exchanger 21 → the first interface 141 of the second four-way valve 14 → the valve cavity of the second four-way valve 14 → the second interface of the second four-way valve 14 142→the first inlet 161 of the first gas-liquid separator 16→the first gas-liquid separator 16→the first outlet 162 of the first gas-liquid separator 161→the first port 131 of the first four-way valve 13, the refrigerant passes through The first four-way valve 13 flows back into the variable capacity compressor 12 for compression, so as to realize continuous flow of refrigerant in the entire refrigerant circulation flow path.

When the first heat exchange unit of the air conditioner is in the heating mode, the valve port of the second four-way valve 14 is at the second valve position, and the flow sequence of the refrigerant in the first refrigerant circulation path is shown by the dotted arrows in the figure: Discharge port 127 of variable capacity compressor 12→fourth port 144 of second four-way valve 14→valve cavity of second four-way valve 14→first port 141 of second four-way valve 14→first indoor heat exchange The first cold coal port 211 of the device 21 → the first indoor heat exchanger 21 → the second cold coal port 212 of the first indoor heat exchanger 21 → the second cold coal port 112 of the outdoor heat exchanger 11 → the outdoor heat exchanger 11 → the first cold coal port 111 of the outdoor heat exchanger 11 → the third port 143 of the second four-way valve 14 → the valve cavity of the second four-way valve 14 → the second port 142 of the second four-way valve 14 → the second The first inlet 161 of a gas-liquid separator 16 → the first gas-liquid separator 16 → the first outlet 162 of the first gas-liquid separator 16 → the first interface 131 of the first four-way valve 13, the refrigerant passes through the first four-way The through valve 131 flows back into the variable capacity compressor 12 for compression, so as to realize continuous flow of refrigerant in the entire refrigerant circulation flow path.

In addition, the second indoor heat exchanger 22 is connected to the outdoor heat exchanger 11 , the second gas-liquid separator 17 , and the variable capacity compressor 12 through the third four-way valve 15 to form a second refrigerant circulation flow path.

The structure and connection method of each component of the first refrigerant circulation flow path are as follows: the second indoor heat exchanger 22 includes a first cold coal port 221 and a second cold coal port 222; the second gas-liquid separator 17 includes a second inlet 171 and the second outlet 172; the third four-way valve 15 includes a valve body, a valve block arranged in a valve cavity in the valve body, and a first interface 151, a second interface 152, a third interface 153 and a fourth interface 154, the valve block It has a first valve position that communicates with the first port 151 and the second port 152, communicates with the third port 153 and the fourth port 154, communicates with the second port 152 and the third port 153, communicates with the first port 151 and the fourth port 154 Second valve position: the first port 151 of the third four-way valve 15 is connected to the first cold coal port 221 of the second indoor heat exchanger 22, and the second port 152 is connected to the second inlet 171 of the second gas-liquid separator 17 connection, the third interface 153 is respectively connected with the first cold coal port 111 and the second cold coal port 112 of the outdoor heat The refrigerant pipeline between the coal ports 111 is defined as the first refrigerant branch 181, and the refrigerant pipeline between the third interface 153 and the second cold coal port 112 of the outdoor heat exchanger 11 is defined as the second refrigerant branch 182 ; The fourth interface 154 is connected with the exhaust port 127 of the variable capacity compressor 12; the second cold coal port 222 of the second indoor heat exchanger 22 is connected with the second cold coal port 112 of the outdoor heat exchanger 11; The second outlet 172 of the liquid separator 17 is connected with the first air inlet 1211 of the first compression cylinder 121 .

In the embodiment, a first solenoid valve 191 is provided on the first refrigerant branch circuit 181 between the third port 153 of the third four-way valve 15 and the first cold coal port 111 of the outdoor heat exchanger 11, and the first solenoid valve 191 can be used to control conduction or block the first refrigerant branch 181; the second refrigerant branch 182 between the third interface 153 of the third four-way valve 15 and the second cold coal port 112 of the outdoor heat exchanger 11 A second solenoid valve 192 is provided, and the second solenoid valve 192 can be used to conduct or block the second refrigerant branch 182; the second cold coal port 222 of the second indoor heat exchanger 22 is connected with the second A third solenoid valve 193 is provided on the refrigerant pipeline between the cold coal ports 112 for conducting or blocking this section of the refrigerant pipeline.

When the second heat exchange unit of the air conditioner is operating in cooling mode or dehumidification mode, the valve block of the third four-way valve 15 is in the first valve position, the first solenoid valve 191 on the first refrigerant branch circuit 181 is opened, and the second refrigerant When the second electromagnetic valve 182 on the branch circuit 182 is closed, the flow sequence of the refrigerant in the first refrigerant circulation flow path is shown by the solid line arrow in the figure: the exhaust port 127 of the variable capacity compressor 12 → the third four-way valve 15 The fourth interface 154 of the third four-way valve 15 → the third interface 153 of the third four-way valve 15 → the first refrigerant branch 181 → the first cold coal port 111 of the outdoor heat exchanger 11 → the outdoor heat exchanger Heater 11 → the second cold coal port 112 of the outdoor heat exchanger 11 → the second cold coal port 222 of the second indoor heat exchanger 22 → the second indoor heat exchanger 22 → the first port of the second indoor heat exchanger 22 Cold coal port 221 → the first port 153 of the third four-way valve 15 → the valve cavity of the third four-way valve 15 → the second port 152 of the third four-way valve 15 → the second inlet of the second gas-liquid separator 17 171 → the second gas-liquid separator 17 → the second outlet 172 of the first gas-liquid separator 17 → the first port 123 of the variable capacity compressor 12, the refrigerant flows back into the variable capacity compressor 12 for compression, thereby realizing The continuous flow of refrigerant in the entire refrigerant circulation flow path.

When the second heat exchange unit of the air conditioner is in the heating mode, the valve block of the third four-way valve 15 is in the second valve position, the first solenoid valve 191 on the first refrigerant branch circuit 181 is opened, and the second refrigerant branch circuit 182 When the second solenoid valve 192 on the top is closed, the flow sequence of the refrigerant in the second refrigerant circulation path is shown by the dotted arrows in the figure: the exhaust port 127 of the variable capacity compressor 12 → the fourth port of the third four-way valve 15 154→the valve cavity of the third four-way valve 15→the first port 151 of the third four-way valve 15→the first cold coal port 221 of the second indoor heat exchanger 22→the second indoor heat exchanger 22→the second indoor The second cold coal port 222 of the heat exchanger 22 → the second cold coal port 112 of the outdoor heat exchanger 11 → the outdoor heat exchanger 11 → the first cold coal port 111 of the outdoor heat exchanger 11 → the first refrigerant branch 181 → the third port 153 of the third four-way valve 15 → the valve cavity of the third four-way valve 15 → the second port 152 of the third four-way valve 15 → the second inlet 171 of the second gas-liquid separator 17 → the second The gas-liquid separator 17 → the second outlet 172 of the second gas-liquid separator 17 → the first port 123 of the variable capacity compressor 12, the refrigerant flows back into the variable capacity compressor 12 for compression, thereby realizing the refrigerant flow in the entire refrigerant Continuous flow in a recirculating flow path.

In addition, the second refrigerant circulation flow path of the present invention can also be used to defrost the outdoor heat exchanger 11 of the air conditioner in winter. In the frost mode, the valve block of the third four-way valve 15 is in the first valve position, the first solenoid valve 191 on the first refrigerant branch circuit 181 is closed, the second solenoid valve 192 on the second refrigerant branch circuit 182 is opened, and the second solenoid valve 192 on the second refrigerant branch circuit 182 is opened. The three solenoid valves 193 are closed. At this time, the second four-way valve 14 of the first refrigerant circulation flow path is in the second valve position, the first heat exchange unit normally heats the room, and the refrigerant flow sequence of the second refrigerant circulation flow path It is: the exhaust port 127 of the variable capacity compressor 12→the fourth port 154 of the third four-way valve 15→the valve chamber of the third four-way valve 15→the third port 153 of the third four-way valve 15→the second refrigerant Branch 182→the second cold coal port 112 of the outdoor heat exchanger 11→outdoor heat exchanger 11→the first cold coal port 111 of the outdoor heat exchanger 11→the third port 153 of the second four-way valve 14→the second The valve cavity of the four-way valve 14 → the second port 142 of the second four-way valve 14 → the first inlet 161 of the first gas-liquid separator 16 → the first gas-liquid separator 16 → the first gas-liquid separator 16 An outlet 162→the first interface 131 of the first four-way valve 13 . In this refrigerant flow path, the high-temperature refrigerant discharged from the variable-capacity compressor 12 does not flow through the second indoor heat exchanger 22 of the second heat exchange unit, and the high-temperature refrigerant directly flows into the outdoor heat exchanger 11 to realize outdoor heat exchange. The defrosting treatment of the heater 11, and the refrigerant whose temperature has dropped after defrosting flows back to the variable capacity compressor 12 along a part of the first refrigerant circulation flow path to be compressed, so as to realize the cooling of the refrigerant in the entire refrigerant circulation flow path. Continuous flow.

A first throttling valve 23 is arranged on the refrigerant pipeline between the second cold coal port 211 of the first indoor heat exchanger 21 and the second cold coal port 112 of the outdoor heat exchanger 11, which is used to control the refrigerant flowing into the first indoor heat exchanger. The refrigerant of the heat exchanger 21 is throttled; the refrigerant pipeline between the second cold coal port 222 of the second indoor heat exchanger 22 and the second cold coal port 112 of the outdoor heat exchanger 11 is provided with a second throttle valve 24 , used for throttling the refrigerant flowing into the second indoor heat exchanger 22 .

Optionally, in order to facilitate the connection between the pipelines of the two refrigerant circulation channels and the outdoor heat exchanger 11, the refrigerant pipeline between the third interface 143 of the second four-way valve 14 and the outdoor heat exchanger 11 is connected to the first A refrigerant branch circuit 181 is connected in parallel, so that the refrigerant can flow into the outdoor heat exchanger 11 after converging when operating in cooling or dehumidification mode, or the refrigerant in the outdoor heat exchanger 11 can be divided into two pipelines during heating; at the same time, the second The refrigerant pipeline between the second cold coal port 212 of the indoor heat exchanger 21 and the second cold coal port 112 of the outdoor heat exchanger 11, and the second cold coal port 222 of the second indoor heat exchanger 22 and the outdoor The refrigerant pipeline between the second cold coal port 112 of the heat exchanger 11 is connected in parallel, and one end of the second refrigerant branch circuit 182 is also connected in parallel with the above-mentioned parallel pipe section at the second cold coal port 112 of the outdoor heat exchanger 11 connect.

In addition, when the variable capacity compressor 12 operates in the two-stage mode, the valve port of the first four-way valve 13 is at the second valve position, blocking the first interface 131, and the first refrigerant circulation flow path is also blocked. Therefore, when the variable-capacity compressor operates in two-stage mode, the air conditioner uses the second refrigerant circulation flow path where the second heat exchange unit is located to realize the cooling, heating or dehumidification of the indoor environment.

It should be understood that the present invention is not limited to the processes and structures that have been described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (9)

1. A control method for an air conditioner, characterized in that the control method comprises: Obtain the indoor temperature, indoor humidity, and the target cooling temperature and target indoor humidity set by the user; When the indoor temperature is greater than a preset indoor temperature threshold and the indoor humidity is greater than a preset indoor humidity threshold, control the air conditioner to operate in a dual-cylinder mode, wherein the dual-cylinder mode includes the air conditioner The operation mode in which the two compression cylinders of the variable capacity compressor independently compress the refrigerant; determining a first temperature difference between the indoor temperature and the target cooling temperature, and determining a first humidity difference between the indoor humidity and the target indoor humidity; When the first temperature difference is greater than the preset temperature difference threshold and the first humidity difference is greater than the preset humidity difference threshold, control the first heat exchange unit to operate in cooling mode, and the second heat exchange unit to operate in dehumidification mode run. 2. The control method according to claim 1, further comprising: determining a second temperature difference value between the indoor temperature and the indoor temperature threshold; determining a second humidity difference between the indoor humidity and the indoor humidity threshold; According to the second temperature difference and the second humidity difference, the operating frequency of the variable capacity compressor is adjusted. 3. The control method according to claim 2, wherein adjusting the operating frequency of the variable capacity compressor according to the second temperature difference and the second humidity difference comprises: When 0≤ΔT ₂ <T ₂ , and 0≤ΔRH ₂ <RH ₂ , controlling the variable capacity compressor to operate at the first operating frequency H ₁ ; When T ₂ ≤ ΔT ₂ , and RH ₂ ≤ ΔRH ₂ , controlling the variable capacity compressor to operate at the second operating frequency H ₂ ; Wherein, ΔT ₂ is the second temperature difference, ΔRH ₂ is the second humidity difference, T ₂ is the preset first temperature threshold, RH ₂ is the preset first humidity threshold, H ₁ <H ₂ . 4. The control method according to claim 1, further comprising: determining a third temperature difference value between the first temperature difference value and the temperature difference threshold; determining a third humidity difference between the first humidity difference and the humidity difference threshold; According to the third temperature difference and the third humidity difference, the speed of the driving fan of each heat exchange unit is adjusted. 5. The control method according to claim 4, wherein, according to the third temperature difference and the third humidity difference, the speed of the driving fan of each heat exchange unit is adjusted, and the process includes: When 0≤ΔT ₃ <T ₃ , and 0≤ΔRH ₃ <RH ₃ , control the drive fan of the first heat exchange unit to run at the first speed R ₁₁ , and control the drive fan of the second heat exchange unit to run at the first speed R 11 . Three-speed R ₂₁ operation; When T ₃ ≤ ΔT ₃ , and RH ₃ ≤ ΔRH ₃ , control the driving fan of the first heat exchange unit to run at the second speed R ₁₂ , and control the driving fan of the second heat exchange unit to run at the fourth speed R ₂₂ ; Wherein, ΔT ₃ is the third temperature difference, T ₃ is the preset second temperature threshold, ΔRH ₃ is the third humidity difference, RH ₃ is the preset second humidity threshold, R ₁₁ <R ₁₂ , R ₂₁ &lt; R ₂₂ . 6. An air conditioner, characterized in that, the air conditioner includes a variable capacity compressor (12) and a controller, and the operating modes of the variable capacity compressor (12) include a two-stage mode and a dual cylinder mode, and the The indoor unit of the air conditioner includes at least two heat exchange units, each of which has a separate heat exchanger; the air conditioner also includes a temperature sensor for detecting indoor temperature and a humidity sensor for detecting indoor humidity ; the controller is used to: Obtaining the indoor temperature, the indoor humidity, and the target cooling temperature and target indoor humidity set by the user; determining a first temperature difference between the indoor temperature and the target cooling temperature, and determining a first humidity difference between the indoor humidity and the target indoor humidity; When the indoor temperature is greater than a preset indoor temperature threshold and the indoor humidity is greater than a preset indoor humidity threshold, control the variable capacity compressor of the air conditioner to operate in a dual-cylinder mode, wherein the dual-cylinder mode An operation mode in which the two compression cylinders of the variable capacity compressor of the air conditioner independently compress the refrigerant; and When the first temperature difference value is greater than the preset temperature difference threshold and the first humidity difference is greater than the preset humidity difference threshold, the first heat exchange unit is controlled to operate in cooling mode, and the second heat exchange unit is controlled to operate in cooling mode. The unit operates in dehumidification mode. 7. The air conditioner according to claim 6, characterized in that the air conditioner further comprises an outdoor unit (1), The outdoor unit (1) includes a variable capacity compressor assembly, an outdoor heat exchanger (11), and the variable capacity compressor assembly includes the variable capacity compressor (12) and a first four-way valve (13); The outdoor heat exchanger (11) includes a first refrigerant port (111) and a second refrigerant port (112); The variable capacity compressor (12) includes a first compression cylinder (121) and a second compression cylinder (122), and the first compression cylinder (121) has a first air inlet (1211) and a first air outlet ( 1212), the second compression cylinder (122) has a second air inlet (1221) and a second air outlet (1222), wherein the second air outlet (1222) of the second compression cylinder (122) ) is communicated with the exhaust port (127) of the variable capacity compressor (12); The first four-way valve (13) includes a valve body, a valve block of a valve cavity arranged in the valve body, and a first port (131), a second port (132), a third port (133) and a Four ports (134), the valve block has a first valve position that communicates with the first port (131) and the second port (132), communicates with the third port (133) and the fourth port (134), and communicates with the second port (132) and the third interface (133), blocking the second valve position of the first interface (131) and the fourth interface (134); Wherein, the second interface (132) communicates with the second air inlet (1221), the third interface (133) communicates with the first air outlet (1212), and the fourth interface (134) communicates with the exhaust port (127); The controlling the variable capacity compressor of the air conditioner to operate in a double-cylinder mode includes: controlling the valve block of the first four-way valve (13) to switch to the first valve position. 8. The air conditioner according to claim 7, characterized in that the outdoor unit further comprises a second four-way valve (14) and a third four-way valve (15), and a first gas-liquid separator (16) And the second gas-liquid separator (17); The indoor unit (2) includes a first heat exchange unit and a second heat exchange unit, wherein the first heat exchange unit includes a first indoor heat exchanger (21), and the second heat exchange unit includes a second heat exchange unit Indoor heat exchanger (22); The first indoor heat exchanger (21) communicates with the outdoor heat exchanger (11), the first gas-liquid separator (16), and the variable capacity compressor (12) through the second four-way valve (14). are connected to form the first refrigerant circulation flow path; Wherein, the first indoor heat exchanger (21) includes a first cold coal port (211) and a second cold coal port (212); the first gas-liquid separator (16) includes a first inlet (161) and the first outlet (162); the second four-way valve (14) includes a valve body, a valve block arranged in a valve cavity in the valve body, and a first interface (141), a second interface (142), The third port (143) and the fourth port (144), the valve block has the first port (141) and the second port (142), the third port (143) and the fourth port (144) connected to the first port (144). A valve position, communicating with the second port (142) and the third port (143), communicating with the second valve position of the first port (141) and the fourth port (144); The first port (141) of the second four-way valve (14) is connected to the first cold coal port (211) of the first indoor heat exchanger (21), and the second port (142) is connected to the first The first inlet (161) of a gas-liquid separator (16) is connected, the third interface (142) is connected with the first cold coal port (111) of the outdoor heat exchanger (11), and the fourth interface (144) Be connected with the exhaust port (127) of the variable capacity compressor (12); The second cold coal port (212) of the first indoor heat exchanger (21) is connected to the second cold coal port (111) of the outdoor heat exchanger (11); The first outlet (162) of the first gas-liquid separator (16) is connected to the first interface (131) of the first four-way valve (13). 9. The air conditioner according to claim 8, characterized in that, The second indoor heat exchanger (22) communicates with the outdoor heat exchanger (11), the second gas-liquid separator (17), and the variable capacity compressor (12) through the third four-way valve (15). are connected to form the second refrigerant circulation flow path; Wherein, the second indoor heat exchanger (22) includes a first cold coal port (221) and a second cold coal port (222); the second gas-liquid separator (17) includes a second inlet (171) and the second outlet (172); the third four-way valve (15) includes a valve body, a valve block arranged in a valve cavity in the valve body, and a first interface (151), a second interface (152), The third port (153) and the fourth port (154), the valve block has the first port (151) and the second port (152), the third port (153) and the fourth port (154) connected to the first port (154) A valve position, connected to the second valve position of the second port (152) and the third port (153), connected to the first port (151) and the fourth port (154); The first port (151) of the third four-way valve (15) is connected to the first cold coal port (221) of the second indoor heat exchanger (22), and the second port (152) is connected to the first The second inlet (171) of the second gas-liquid separator (17) is connected, and the third interface (153) is connected with the first cold coal port (111) and the second cold coal port (112) of the outdoor heat exchanger (11). ) are connected respectively, and the fourth interface (154) is connected with the exhaust port (127) of the variable capacity compressor (12); The second cold coal port (222) of the second indoor heat exchanger (22) is connected to the second cold coal port (112) of the outdoor heat exchanger (11); The second outlet (172) of the second gas-liquid separator (17) is connected to the first air inlet (1211) of the first compression cylinder (121); A first solenoid valve ( 191), the refrigerant pipeline between the third interface (153) of the third four-way valve (11) and the second cold coal port (112) of the outdoor heat exchanger (11) is provided with a first Two solenoid valves (1920; the refrigerant pipe between the second cold coal port (222) of the second indoor heat exchanger (22) and the second cold coal port (112) of the outdoor heat exchanger (11) A third solenoid valve (193) is provided on the road; the second cold coal port (212) of the first indoor heat exchanger (21) and the second cold coal port (112) of the outdoor heat exchanger (11) There is a first throttling valve (23) on the refrigerant pipeline between them, the second cold coal port (222) of the second indoor heat exchanger (22) and the second A second throttling valve (24) is arranged on the refrigerant pipeline between the cold coal ports (112).