CN106871385B

CN106871385B - Air conditioner and control method

Info

Publication number: CN106871385B
Application number: CN201710238978.5A
Authority: CN
Inventors: 罗荣邦
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Haier Smart Home Co Ltd; Qingdao Haier Jiaozhou Air Conditioner Co Ltd
Priority date: 2017-04-13
Filing date: 2017-04-13
Publication date: 2020-08-25
Anticipated expiration: 2037-04-13
Also published as: CN106871385A

Abstract

The invention discloses an air conditioner and a control method, and belongs to the technical field of air conditioners. The air conditioner is provided with a variable-capacity compressor, the operation modes of the variable-capacity compressor comprise a two-stage mode and a two-cylinder mode, an indoor unit of the air conditioner at least comprises a first heat exchange unit and a second heat exchange unit, and when the variable-capacity compressor operates in the two-stage mode, a refrigerant flow path of the first heat exchange unit is blocked; the control method comprises the following steps: acquiring indoor temperature, target refrigerating temperature and sleep time period; controlling the air conditioner to operate in a two-stage mode; when the air conditioner operates in the sleep time period, the first heat exchange unit is controlled to stop operating, and the second heat exchange unit operates in a refrigeration mode. The control method can control the variable-capacity compressor of the air conditioner to operate in a two-stage mode according to the indoor temperature condition in summer, and ensures that the air conditioner can operate in the optimal energy efficiency state.

Description

Air conditioner and 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

The conventional air conditioner mostly adopts a mechanical compressor to perform compression operation of temperature rise and pressure rise on a refrigerant, such as a piston compressor, a screw compressor, a centrifugal compressor, a linear compressor and the like, and can be divided into a single-cylinder compressor, a double-cylinder compressor and a multi-cylinder compressor according to the number of compression cylinder bodies in the compressor, wherein for the double-cylinder compressor and the multi-cylinder compressor with the number of cylinder bodies not less than one, the compression process is that multistage compression operation is sequentially performed on the refrigerant according to the connection sequence among the multiple cylinder bodies. When the air conditioner normally operates, the compressor can only raise and boost the temperature and the pressure of a refrigerant according to a fixed single compression sequence mode, but due to the influence of various factors such as outdoor ambient temperature, indoor temperature and the like, the air conditioner has different requirements on the operating frequency, the compression efficiency and the like of the compressor under different working conditions, so that the conventional compressor often has useless power consumption when operating in a single compression mode and cannot reach the optimal energy efficiency operating state of the air conditioner.

Disclosure of Invention

The invention provides an air conditioner and a control method, and aims to improve the working energy efficiency of the air conditioner. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such 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 a first aspect of the present invention, there is provided a control method of an air conditioner, the control method comprising: acquiring indoor temperature, target refrigerating temperature set by a user and sleep time period; when the indoor temperature is not greater than a preset indoor temperature threshold value, controlling the air conditioner to operate in a two-stage mode, wherein the two-stage mode comprises an operation mode that two compression cylinder bodies of a variable-capacity compressor of the air conditioner compress refrigerants in sequence; determining a first temperature difference value between the indoor temperature and the target refrigerating temperature; when the first temperature difference value is not larger than the preset temperature difference threshold value and the air conditioner is in sleep time interval operation, the first heat exchange unit is controlled to stop operation, and the second heat exchange unit operates in a refrigeration mode.

Further, the control method further comprises: determining a second temperature difference value between the indoor temperature and the indoor temperature threshold; and adjusting the working frequency of the variable capacity compressor according to the second temperature difference value.

Further, according to the second temperature difference value, the working frequency of the variable capacity compressor is adjusted, and the process includes: at 0 ≤ Δ T₂＜T₂While controlling the variable capacity compressor to the first working frequency H₁Running; at T₂≤ΔT₂While controlling the variable capacity compressor to the second working frequency H₂Running; wherein, Delta T₂Is the second temperature difference value, T₂Is a preset first temperature threshold, H₁＜H₂。

Further, the control method further comprises: determining a third temperature difference value between the first temperature difference value and the temperature difference threshold value; and adjusting the rotating speed of a driving fan of the second heat exchange unit according to the third temperature difference value.

Further, according to the third temperature difference value, the rotating speed of the driving fan of the second heat exchange unit is adjusted, and the process comprises the following steps: at 0 ≤ Δ T₃＜T₃In the meantime, the driving fan of the second heat exchange unit is controlled to rotate at a first speed R₁₁Running; at T₃≤ΔT₃In the meantime, the driving fan of the second heat exchange unit is controlled to rotate at a second rotating speed R₁₂Running; wherein, Delta T₃Is the third temperature difference value, T₃Is a preset second temperature threshold, R₁₁＜R₁₂。

According to a second aspect of the present invention, there is also provided an air conditioner, the air conditioner includes a variable capacity compressor and a controller, operation modes of the variable capacity compressor include a two-stage mode and a two-cylinder mode, an indoor unit of the air conditioner includes at least a first heat exchange unit and a second heat exchange unit which are connected in parallel and respectively have a separate heat exchanger and a drive fan, and when the variable capacity compressor operates the two-stage mode, a refrigerant flow path of the first heat exchange unit is in a blocked state; the air conditioner further comprises a temperature sensor for detecting the indoor temperature; the controller is used for: acquiring indoor temperature, target refrigerating temperature set by a user and sleep time period; determining a first temperature difference value between the indoor temperature and the target refrigerating temperature; when the indoor temperature is not more than a preset indoor temperature threshold value, controlling a variable-capacity compressor of the air conditioner to operate in a two-stage mode, wherein the two-stage mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor of the air conditioner compress refrigerants in sequence; and when the first temperature difference value is not greater than the preset temperature difference threshold value and the air conditioner is in sleep time interval operation, controlling the first heat exchange unit to stop operation and the second heat exchange unit to operate in a refrigeration mode.

Further, the air conditioner comprises an outdoor unit, wherein the outdoor unit comprises a variable capacity compressor assembly and an outdoor heat exchanger, and the variable capacity compressor assembly comprises a variable capacity compressor and a first four-way valve; the outdoor heat exchanger comprises a first refrigerant port and a second refrigerant port; the variable-capacity compressor comprises a first compression cylinder and a second compression cylinder, wherein the first compression cylinder is provided with a first air inlet and a first air outlet, the second compression cylinder is provided with a second air inlet and a second air outlet, and the second air outlet of the second compression cylinder is communicated with an air outlet of the variable-capacity compressor; the first four-way valve comprises a valve body, a valve block arranged in a valve cavity in the valve body, a first interface, a second interface, a third interface and a fourth interface, wherein the valve block is provided with a first valve position for communicating the first interface with the second interface and communicating the third interface with the fourth interface, and a second valve position for communicating the second interface with the third interface and blocking the first interface and the fourth interface; the second interface is communicated with the second air inlet, the third interface is communicated with the first air outlet, and the fourth interface is communicated with the air outlet; controlling a variable capacity compressor of an air conditioner to operate in a two-stage mode, comprising: and controlling the valve block of the first four-way valve to be switched to the second valve position.

Further, the outdoor unit also comprises a second four-way valve, a third four-way valve, a first gas-liquid separator and a second gas-liquid separator; the indoor unit comprises a first heat exchange unit and a second heat exchange unit, wherein the first heat exchange unit comprises a first indoor heat exchanger, and the second heat exchange unit comprises a second indoor heat exchanger; the first indoor heat exchanger is connected with the outdoor heat exchanger, the first gas-liquid separator and the variable-capacity compressor through a second four-way valve to form a first refrigerant circulating flow path; the first indoor heat exchanger comprises a first refrigerant port and a second refrigerant port; the first gas-liquid separator comprises a first inlet and a first outlet; the second four-way valve comprises a valve body, a valve block arranged in a valve cavity in the valve body, a first interface, a second interface, a third interface and a fourth interface, wherein the valve block is provided with a first valve position communicated with the first interface, the second interface, the third interface and the fourth interface, and a second valve position communicated with the second interface, the third interface and the fourth interface; a first interface of the second four-way valve is connected with a first refrigerant port of the first indoor heat exchanger, a second interface is connected with a first inlet of the first gas-liquid separator, a third interface is connected with a first refrigerant port of the outdoor heat exchanger, and a fourth interface is connected with an exhaust port of the variable capacity compressor; a second refrigerant port of the first indoor heat exchanger is connected with a second refrigerant port of the outdoor heat exchanger; and a first outlet of the first gas-liquid separator is connected with a first interface of the first four-way valve.

Further, the second indoor heat exchanger is connected with the outdoor heat exchanger, the second gas-liquid separator and the variable-capacity compressor through a third four-way valve to form a second refrigerant circulating flow path; the second indoor heat exchanger comprises a first refrigerant port and a second refrigerant port; the second gas-liquid separator comprises a second inlet and a second outlet; the third four-way valve comprises a valve body, a valve block arranged in a valve cavity in the valve body, a first interface, a second interface, a third interface and a fourth interface, wherein the valve block is provided with a first valve position communicated with the first interface, the second interface, the third interface and the fourth interface, and a second valve position communicated with the second interface, the third interface and the fourth interface; a first interface of the third four-way valve is connected with a first refrigerant port of the second indoor heat exchanger, a second interface is connected with a second inlet of the second gas-liquid separator, a third interface is respectively connected with a first refrigerant port and a second refrigerant port of the outdoor heat exchanger, and a fourth interface is connected with an exhaust port of the variable-capacity compressor; a second refrigerant port of the second indoor heat exchanger is connected with a second refrigerant port of the outdoor heat exchanger; a second outlet of the second gas-liquid separator is connected with a first air inlet of the first compression cylinder; a first electromagnetic valve is arranged on a refrigerant pipeline between a third interface of the third four-way valve and a first refrigerant port of the outdoor heat exchanger, and a second electromagnetic valve is arranged on a refrigerant pipeline between the third interface of the third four-way valve and a second refrigerant port of the outdoor heat exchanger; a third electromagnetic valve is arranged on a refrigerant pipeline between a second refrigerant port of the second indoor heat exchanger and a second refrigerant port of the outdoor heat exchanger; and a first throttle valve is arranged on a refrigerant pipeline between the second refrigerant port of the first indoor heat exchanger and the second refrigerant port of the outdoor heat exchanger, and a second throttle valve is arranged on a refrigerant pipeline between the second refrigerant port of the second indoor heat exchanger and the second refrigerant port of the outdoor heat exchanger.

The control method can control the variable-capacity compressor of the air conditioner to operate in a two-stage mode according to the indoor temperature condition in summer, and control the heat exchange unit to refrigerate according to the temperature difference, so that the refrigerant output by the variable-capacity compressor can meet the refrigerant quantity requirement of the heat exchange unit of the air conditioner during refrigeration, and the air conditioner can be ensured to operate in the optimal energy efficiency state; meanwhile, the invention can also judge whether the air conditioner operates in the sleep time period of the user so as to control the air supply operation of the air conditioner, thereby improving the use experience of the user in the sleep time period.

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, as claimed.

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 flow chart illustrating a control method of the present invention according to an exemplary embodiment;

fig. 2 is a schematic structural view of an air conditioner according to the present invention shown in an exemplary embodiment.

Wherein, 1, an outdoor unit;

11. an outdoor heat exchanger; 111. a first refrigerant port; 112. a second refrigerant port;

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

1211. a first air inlet; 1212. a first air outlet;

1221. a second air inlet; 1222. a second air outlet;

because the first four-way valve, the second four-way valve and the third four-way valve are all arranged on a plurality of interfaces, the invention distinguishes a plurality of interfaces with the same name of different four-way valves by adopting different reference numerals, and the method comprises the following steps:

13. a first four-way valve; 131. a first interface; 132. a second interface; 133. a third interface; 134. a fourth interface;

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

15. a third four-way valve; 151. a first interface; 152. a second interface; 153. a third interface; 154. a fourth interface;

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

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

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

191. a first solenoid valve; 192. a second solenoid valve; 193. a third electromagnetic valve;

2. an indoor unit;

because the outdoor heat exchanger, the first indoor heat exchanger and the second indoor heat exchanger are all arranged on the plurality of refrigerant ports, the invention distinguishes a plurality of refrigerant ports with the same name of different heat exchangers by adopting different reference numerals, which is concretely as follows:

21. a first indoor heat exchanger; 211. a first refrigerant port; 212. a second refrigerant port;

22. a second indoor heat exchanger; 221. a first refrigerant port; 222. a second refrigerant port;

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

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.

As shown in fig. 1, the present invention discloses a control method of an air conditioner, which can be used for controlling the air conditioner to perform cooling and air supplying operations to an indoor environment according to a summer temperature condition and an air conditioner operation period, and the control method specifically comprises the following steps: s101, acquiring indoor temperature, target refrigerating temperature set by a user and sleep time period; s102, when the indoor temperature is not greater than a preset indoor temperature threshold value, controlling the air conditioner to operate in a two-stage mode, wherein the two-stage mode comprises an operation mode that two compression cylinder bodies of a variable-capacity compressor of the air conditioner compress refrigerants in sequence; s103, determining a first temperature difference value between the indoor temperature and the target refrigerating temperature; and S104, when the first temperature difference value is not larger than a preset temperature difference threshold value and the air conditioner is in sleep time period operation, controlling the first heat exchange unit to stop operation and controlling the second heat exchange unit to operate in a refrigeration mode. The heat exchange unit of the air conditioner can refrigerate the indoor environment when the indoor temperature does not exceed the indoor temperature threshold in summer through the operation refrigeration mode so as to ensure that the indoor temperature can meet the comfort requirement of a user; and the refrigeration or air supply operation of one heat exchange unit can be stopped in the sleeping time of the user, so that the problem that the sleeping of the user is influenced due to the excessively low indoor environment temperature is avoided.

In the control method, the air conditioner compresses the refrigerant by using the variable-capacity compressor, wherein in the embodiment, the variable-capacity compressor is a double-cylinder compressor, and the operation modes of the double-cylinder compressor comprise a two-stage mode and a double-cylinder mode. The two-stage mode is that a refrigerant sequentially flows through two compression cylinder bodies of the compressor to be compressed, and is suitable for working conditions with small temperature difference and small humidity difference; the double-cylinder mode is that the refrigerant flows through two compression cylinder bodies of the compressor respectively and compresses, and is suitable for the working conditions of large temperature difference and large humidity.

Meanwhile, in summer, the indoor unit of the air conditioner needs to refrigerate the indoor environment, the two heat exchange units have different requirements on the quantity and the temperature of the refrigerant, the heat exchange unit which needs refrigerating operation needs more refrigerant, and the heat exchange unit which stops operating does not need to input the refrigerant.

The indoor temperature acquired in step S101 may be detected by a temperature sensor disposed in the indoor environment. In one embodiment, the indoor temperature is a real-time indoor temperature detected by a temperature sensor. In another embodiment, in order to reduce the interference effect caused by the transient temperature change, the indoor temperature may also be an average indoor temperature within a certain set time period, for example, the temperature sensor detects 5 times of indoor environment temperature within 5 minutes, each time the detection interval is 1 minute, and then the average value of the 5 times of indoor environment temperature may be used as the indoor temperature applied by the control method of the present invention.

The target cooling temperature acquired in step S101 is an indoor cooling temperature set by a user through a remote controller or a display control panel on the air conditioner body.

The sleep period acquired in step S101 may be a time period set by the user himself, for example, the user may set 22: 00-6:00 is set as the night time period, and 13:00-15:00 is set as the noon break time period, when the air conditioner operates in the above time period, the operation mode of the air conditioner needs to be correspondingly controlled according to the control method provided by the invention. In addition, the sleep time interval can also be a default time interval preset by an air conditioner manufacturer before product delivery, and a user can also adjust the sleep time interval on the basis of the default time interval.

In an embodiment of the present invention, the indoor temperature threshold preset in step S102 is used to determine an amount of refrigerant expected to be required for the operation of the air conditioner, when the indoor temperature is not greater than the indoor temperature threshold, the air conditioner still needs to cool the indoor environment to maintain the stability of the indoor temperature condition, and the amount of refrigerant required for the operation of the air conditioner is small, so that the variable capacity compressor of the air conditioner needs to operate in a mode of outputting less refrigerant.

Therefore, in the step S102, when the indoor temperature is not greater than the preset indoor temperature threshold, the variable capacity compressor is controlled to operate in the two-stage mode, the two compression cylinders sequentially compress the refrigerant, so that the compression efficiency of the refrigerant output to the refrigerant circulation system of the air conditioner can be increased, the refrigerant amount can meet the operation requirement of the air conditioner, and the working efficiency of the air conditioner is improved.

In an embodiment, the first temperature difference determined in step S103 is a temperature difference between the indoor temperature and the target cooling temperature, for example, the indoor ambient temperature is 32 ℃, the target cooling temperature set by the user is 27 ℃, and the first temperature difference is a difference between the indoor temperature and the target cooling temperature, that is, 5 ℃.

In an embodiment, in order to enable the air conditioner to start different operation modes for the two heat exchange units according to the current working condition, in step S104, when the first temperature difference value is not greater than the preset temperature difference threshold value and the air conditioner is in operation in a sleep period, one of the heat exchange units is controlled to operate in a refrigeration mode, and the other heat exchange unit stops operating. In the process, the refrigerant quantity input into the second heat exchange unit can be adjusted by controlling the opening degree of the flow valve in the second heat exchange unit, so that the refrigerant quantity requirement of the second heat exchange unit in the refrigeration mode is met.

The air conditioner may be in data connection with the local network through wifi, a data line, etc., so as to obtain a time point at which the air conditioner is currently operating, and thus, the time point is used to determine whether the air conditioner is operating in the sleep period in step S104.

The temperature difference threshold is used for judging the temperature difference degree between the indoor temperature and the target refrigerating temperature, the larger the first temperature difference value obtained by calculating the indoor temperature and the target refrigerating temperature is, the larger the temperature difference between the indoor temperature and the target refrigerating temperature is, and the larger the temperature difference to be regulated by the air conditioner is, and under the working condition that the indoor temperature is not greater than the preset indoor temperature threshold, at least one heat exchange unit of the air conditioner needs to be controlled to operate a refrigerating mode so as to maintain the temperature stability of the indoor environment; meanwhile, the larger the first temperature difference value is, the more the amount of refrigerant required by the air conditioner to reduce the indoor environment temperature is, so that the variable capacity compressor can be matched with the current working condition when running in a two-stage mode under the working condition that the first temperature difference value is not more than the preset temperature difference threshold value. The air conditioner in the embodiment includes two heat exchange units, and thus in step S104, the first heat exchange unit is controlled to stop operating to reduce airflow flowing in the indoor environment, so as to avoid discomfort to the user due to too low room temperature during sleep, and the second heat exchange unit is controlled to operate in the cooling mode to cool the indoor environment, so as to keep the temperature of the indoor environment stable.

In one embodiment of the invention, the steps of the control method further comprise: determining a second temperature difference value between the indoor temperature and the indoor temperature threshold; and adjusting the working frequency of the variable capacity compressor according to the second temperature difference value. The indoor temperature threshold is mainly used for judging the expected required refrigerant quantity for the operation of the air conditioner so as to judge the operation mode of the variable capacity compressor, and the refrigerant output quantity of the air conditioner is influenced by the operation mode of the variable capacity compressor and the working frequency of the variable capacity compressor, so that the operation frequency of the compressor can be adjusted by judging the second temperature difference value between the indoor temperature and the indoor temperature threshold; the larger the second temperature difference value is, the larger the amount of refrigerant required by the operation of the air conditioner is, so that the working frequency of the compressor is increased, and the output efficiency of the refrigerant can be effectively improved.

In a specific embodiment, the adjusting the operating frequency of the variable displacement compressor according to the second temperature difference value includes:

at 0 ≤ Δ T₂＜T₂While controlling the variable capacity compressor to the first working frequency H₁Running;

at T₂≤ΔT₂While controlling the variable capacity compressor to the second working frequency H₂Running;

wherein, Delta T₂Is the second temperature difference value, T₂Is a preset first temperature threshold value with the value range of 3-5 ℃, and H₁＜H₂。

In one embodiment of the invention, the steps of the control method further comprise: determining a third temperature difference value between the first temperature difference value and the temperature difference threshold value; and adjusting the rotating speed of a driving fan of the second heat exchange unit according to the third temperature difference value. The temperature difference threshold value is mainly used for judging the temperature difference degree between the indoor temperature and the target refrigerating temperature, and when the temperature difference is large, the air quantity flowing through different heat exchange units can be adjusted through the rotating speed of the driving fan controlling the heat exchange units, so that the refrigerating efficiency or the air supply efficiency of the heat exchange units can be adjusted.

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

at 0 ≤ Δ T₃＜T₃In the meantime, the driving fan of the second heat exchange unit is controlled to rotate at a first speed R₁₁Running;

at T₃≤ΔT₃In the meantime, the driving fan of the second heat exchange unit is controlled to rotate at a second rotating speed R₁₂Running;

wherein, Delta T₃Is the third temperature difference value, T₃Is a preset second temperature threshold, R₁₁＜R₁₂That is, the larger the third temperature difference value is, the higher the rotation speed of the driving fan of the heat exchange unit in the corresponding operation cooling mode is.

In other embodiments of the present invention, various method flows for controlling the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units according to parameters such as indoor temperature, indoor humidity, outdoor temperature, outdoor humidity and the like when the air conditioner operates in summer and winter conditions are also disclosed, which are described below with reference to different embodiments:

in the first embodiment of the present invention, in summer, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor temperature and indoor humidity, and the specific process includes: acquiring indoor temperature and indoor humidity, and target refrigerating temperature and target indoor humidity set by a 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, controlling the variable-capacity compressor to operate in a double-cylinder mode; determining a first temperature difference value between the indoor temperature and the target refrigerating temperature, and determining a first humidity difference value between the indoor humidity and the target indoor humidity; and when the first temperature difference value is greater than a preset temperature difference threshold value and the first humidity difference value is greater than a preset humidity difference threshold value, controlling the first heat exchange unit to operate in a refrigeration mode and controlling the second heat exchange unit to operate in a dehumidification mode. The control method can control the two heat exchange units of the air conditioner to refrigerate and dehumidify the indoor environment at the same time, and ensures the stability of the indoor temperature and humidity conditions.

In a second embodiment of the present invention, in summer, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor temperature and indoor humidity, and the specific process includes: acquiring indoor temperature and indoor humidity, and target refrigerating temperature and target indoor humidity set by a user; when the indoor temperature is higher than a preset indoor temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode; determining a first temperature difference value between the indoor temperature and the target refrigerating humidity, and determining a first humidity difference value between the indoor humidity and the target indoor humidity; and when the first temperature difference value is greater than a preset temperature difference threshold value and the first humidity difference value is not greater than a preset humidity difference threshold value, controlling the two heat exchange units to run in a refrigeration mode. The control method can control the two heat exchange units of the air conditioner to refrigerate the indoor environment at the same time so as to accelerate the refrigeration efficiency of the air conditioner.

In a third embodiment of the present invention, in summer, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor temperature and indoor humidity, and the specific process includes: acquiring indoor temperature and indoor humidity, and target refrigerating temperature and target indoor humidity set by a user; when the indoor humidity is greater than a preset indoor humidity threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode; determining a first temperature difference value between the indoor temperature and the target refrigerating humidity, and determining a first humidity difference value between the indoor humidity and the target indoor humidity; and when the first temperature difference value is not greater than a preset temperature difference threshold value and the first humidity difference value is greater than a preset humidity difference threshold value, controlling the two heat exchange units to operate in a dehumidification mode. The 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 accelerate the dehumidification efficiency of the air conditioner.

In a fourth embodiment of the present invention, in summer, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor temperature and indoor humidity, and the specific process includes: acquiring indoor temperature and indoor humidity, and target refrigerating temperature and target indoor humidity set by a user; when the indoor temperature is higher than a preset indoor temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode; determining a first temperature difference value between the indoor temperature and the target refrigerating humidity, and determining a first humidity difference value between the indoor humidity and the target indoor humidity; when the first temperature difference value is greater than a preset temperature difference threshold value and the first humidity difference value is not greater than a preset humidity difference threshold value, the following mode of periodic alternate operation of the two heat exchange units is controlled: in the first mode, the first heat exchange unit operates in a refrigeration mode, and the first heat exchange unit operates in an air supply mode; in a second mode, both heat exchange units operate in a refrigeration mode. The control method can control the two heat exchange units of the air conditioner to alternatively run in a refrigeration and air supply mode, so that the refrigeration efficiency of the air conditioner is accelerated, and meanwhile, the air conditioner can have an air supply effect of natural wind.

In a fifth embodiment of the present invention, in summer, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor temperature and indoor humidity, and the specific process includes: acquiring indoor temperature and indoor humidity, and target refrigerating temperature and target indoor humidity set by a user; when the indoor humidity is greater than a preset indoor humidity threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode; determining a first temperature difference value between the indoor temperature and the target refrigerating humidity, and determining a first humidity difference value between the indoor humidity and the target indoor humidity; when the first temperature difference value is not larger than a preset temperature difference threshold value and the first humidity difference value is larger than a preset humidity difference threshold value, the following mode of periodic alternate operation of the two heat exchange units is controlled: in the first mode, the first heat exchange unit operates in a dehumidification mode, and the first heat exchange unit operates in an air supply mode; in a second mode, both heat exchange units operate in a dehumidification mode. The control method can control the two heat exchange units of the air conditioner to alternately operate in a dehumidification and air supply mode, so that the dehumidification efficiency of the air conditioner can be improved, and meanwhile, the air conditioner can have an air supply effect of natural wind.

In a sixth embodiment of the present invention, in summer, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor temperature, and the specific process includes: acquiring indoor temperature and target refrigerating temperature set by a user; when the indoor temperature is not more than a preset indoor temperature threshold value, controlling the variable-capacity compressor to operate in a two-stage mode; determining a first temperature difference value between the indoor temperature and the target refrigerating humidity; and when the first temperature difference value is not greater than a preset temperature difference threshold value, controlling the first heat exchange unit to operate in an air supply mode, and controlling the second heat exchange unit to operate in a refrigeration mode. The control method can control the single heat exchange unit of the air conditioner to refrigerate the indoor environment so as to accelerate the refrigeration efficiency of the air conditioner and simultaneously enable the air conditioner to have the air supply effect of natural wind.

In a seventh embodiment of the present invention, in summer, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor humidity, and the specific process includes: acquiring indoor humidity and target indoor humidity set by a user; when the indoor humidity is not greater than a preset indoor humidity threshold value, controlling the variable-capacity compressor to operate in a two-stage mode; determining a first humidity difference between the indoor humidity and a target indoor humidity; and when the first humidity difference value is not greater than a preset humidity difference threshold value, controlling the first heat exchange unit to operate in an air supply mode, and controlling the second heat exchange unit to operate in a dehumidification mode. The control method can control the single heat exchange unit of the air conditioner to dehumidify the indoor environment so as to accelerate the refrigeration efficiency of the air conditioner and enable the air conditioner to have the air supply effect of natural wind.

In an eighth embodiment of the present invention, in summer, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor humidity, and the specific process includes: acquiring indoor humidity and target indoor humidity and sleep time period set by a user; when the indoor humidity is not greater than a preset indoor humidity threshold value, controlling the variable-capacity compressor to operate in a two-stage mode; determining a first humidity difference between the indoor humidity and a target indoor humidity; and when the first humidity difference value is not greater than a preset humidity difference threshold value and the air conditioner is in sleep time interval operation, controlling the first heat exchange unit to stop operation and the second heat exchange unit to operate in a dehumidification mode. The control method can control a single heat exchange unit of the air conditioner to dehumidify the indoor environment so as to ensure that the indoor temperature can meet the comfort requirement of a user; and the refrigeration or air supply operation of the first heat exchange unit can be stopped in the sleep time period of the user, so that the problem that the sleep of the user is influenced due to the excessively low indoor environment temperature is avoided.

In a ninth embodiment of the present invention, in winter, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor temperature and outdoor humidity, and the specific process includes: when the outdoor humidity is greater than a preset outdoor humidity threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode; determining a first temperature difference value between the indoor humidity and the target heating temperature; and when the first temperature difference value is not greater than the preset temperature difference threshold value, controlling the first heat exchange unit to operate in a heating mode, and stopping the first heat exchange unit. The first heat exchange unit of the air conditioner can achieve the heating and warming effects on the indoor environment through the operation heating mode, the comfort level of a user is improved, and meanwhile the problem of outdoor unit frosting caused by higher humidity of the outdoor environment can be reduced. In addition, the invention controls the other heat exchange unit to stop running, can reduce the heating running power consumption of the air conditioner and improve the running energy efficiency of the air conditioner.

In a tenth embodiment of the present invention, in winter, an operation mode of the variable capacity compressor and an operation mode of the two heat exchange units are controlled according to parameters such as an indoor temperature, and a specific process includes: acquiring indoor temperature and target heating temperature set by a user; determining a first temperature difference value between the indoor temperature and the target heating temperature; when the indoor temperature is not greater than a preset indoor temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode; and when the first temperature difference value is larger than a preset temperature difference threshold value, controlling the two heat exchange units to operate in a heating mode. The 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 accelerate the heating efficiency of the air conditioner.

In an eleventh embodiment of the present invention, in winter, the operation mode of the variable capacity compressor and the operation modes of the two heat exchange units are controlled according to parameters such as indoor temperature and outdoor temperature, and the specific process includes: acquiring indoor temperature and outdoor temperature; when the indoor temperature is not greater than a preset indoor temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode; and when the outdoor temperature reaches a frost condensation condition, controlling the first heat exchange unit to operate in a heating mode, and controlling the second heat exchange unit to operate in a defrosting mode, wherein an indoor pipeline of a refrigerant circulation flow path of the heat exchange unit operating in the defrosting mode is blocked, and the refrigerant only flows through a heat exchanger of the outdoor unit. The first heat exchange unit of the air conditioner can achieve the heating and warming effects on the indoor environment through the operation heating mode, the comfort level of a user is improved, and meanwhile, the refrigerant flow path where the other heat exchange unit is located is controlled to defrost the outdoor unit so as to reduce the frosting problem of the outdoor unit.

In a twelfth embodiment of the present invention, under a working condition in winter, an operation mode of the variable capacity compressor and working modes of the two heat exchange units are controlled according to parameters such as indoor temperature, and a specific process thereof includes: acquiring indoor temperature and target heating temperature set by a user; when the indoor temperature is higher than a preset indoor temperature threshold value, controlling the variable-capacity compressor to operate in a two-stage mode; determining a first temperature difference value between the indoor temperature and the target heating temperature; and when the first temperature difference value is not greater than a preset temperature difference threshold value, controlling the first heat exchange unit to operate in an air supply mode, and controlling the second heat exchange unit to operate in a heating mode. Two heat exchange units of the air conditioner can heat and supply air to the indoor environment when the indoor temperature exceeds an indoor temperature threshold value in winter through respectively operating a heating mode and an air supply mode so as to ensure that the indoor temperature can meet the comfort requirement of a user.

In a thirteenth embodiment of the present invention, in a winter working condition, an operation mode of the variable capacity compressor and operation modes of the two heat exchange units are controlled according to parameters such as an indoor temperature, and a specific process includes: acquiring indoor temperature, target heating temperature set by a user and sleep time period; when the indoor temperature is higher than a preset indoor temperature threshold value, controlling the variable-capacity compressor to operate in a two-stage mode; when the first temperature difference value is not larger than the preset temperature difference threshold value and the air conditioner is in sleep time interval operation, the first heat exchange unit is controlled to stop operation, and the second heat exchange unit operates in a heating mode. The heat exchange unit of the air conditioner can heat the indoor environment when the indoor temperature exceeds an indoor temperature threshold value in winter through a heating mode so as to ensure that the indoor temperature can meet the comfort requirement of a user; and the heating or air supply operation of the first heat exchange unit can be stopped in the sleep time period of the user, so that the problem that the sleep of the user is influenced due to overhigh indoor environment temperature is avoided.

As shown in fig. 2, the present invention further provides an air conditioner, the air conditioner includes a variable capacity compressor and a controller, the operation modes of the variable capacity compressor include a two-stage mode and a two-cylinder mode, an indoor unit of the air conditioner at least includes a first heat exchange unit and a second heat exchange unit which are connected in parallel and respectively have a heat exchanger and a driving fan, and when the variable capacity compressor operates the two-stage mode, a refrigerant flow path of the first heat exchange unit is in a blocked state; the controller controls the operation of the air conditioner according to the control method disclosed in the foregoing embodiment, and in the embodiment, the controller is mainly used for: acquiring indoor temperature, target refrigerating temperature set by a user and sleep time period; determining a first temperature difference value between the indoor temperature and the target refrigerating temperature; when the indoor temperature is not more than a preset indoor temperature threshold value, controlling a variable-capacity compressor of the air conditioner to operate in a two-stage mode, wherein the two-stage mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor of the air conditioner compress refrigerants in sequence; and when the first temperature difference value is not greater than the preset temperature difference threshold value and the air conditioner is in sleep time interval operation, controlling the first heat exchange unit to stop operation and the second heat exchange unit to operate in a refrigeration mode.

In one embodiment of the invention, the controller is further configured to: determining a second temperature difference value between the indoor temperature and the indoor temperature threshold; and adjusting the working frequency of the variable capacity compressor according to the second temperature difference value.

In one embodiment of the invention, the controller is to: at 0 ≤ Δ T₂＜T₂While controlling the variable capacity compressor to the first working frequency H₁Running; at T₂≤ΔT₂While controlling the variable capacity compressor to the second working frequency H₂Running; wherein, Delta T₂Is the second temperature difference value, T₂Is a preset first temperature threshold, H₁＜H₂。

In one embodiment of the invention, the controller is to: determining a third temperature difference value between the first temperature difference value and the temperature difference threshold value; and adjusting the rotating speed of a driving fan of the second heat exchange unit according to the third temperature difference value.

In one embodiment of the invention, the controller is to: at 0 ≤ Δ T₃＜T₃In the meantime, the driving fan of the second heat exchange unit is controlled to rotate at a first speed R₁₁Running; at T₃≤ΔT₃In the meantime, the driving fan of the second heat exchange unit is controlled to rotate at a second rotating speed R₁₂Running; wherein, Delta T₃Is the third temperature difference value, T₃Is a preset second temperature threshold, R₁₁＜R₁₂。

Meanwhile, the controller of the present invention may also be used to control the air conditioner to operate one or more related processes of the control methods disclosed in the foregoing first to thirteenth embodiments.

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

the air conditioner comprises an outdoor unit 1 and an indoor unit 2, wherein the outdoor unit 1 is arranged outdoors and used for exchanging heat with the outdoor environment; the indoor unit 2 is disposed indoors and is configured to exchange heat with an indoor environment, thereby achieving operations such as cooling, heating, or dehumidification of the indoor environment.

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

In the specific embodiment, the variable displacement compressor 12 includes a first compression cylinder 121 and a second compression cylinder 122, both of which can independently perform compression operation on refrigerant, and in the illustration, as for a single variable displacement compressor, cylinder bodies of the two compression cylinders are not communicated with each other, in the present invention, the two compression cylinder bodies are communicated by the first four-way valve 13, and when the first four-way valve 13 is at different valve positions, the two compression cylinders respectively form a two-stage mode refrigerant flow path and a two-cylinder mode refrigerant flow path.

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

The first four-way valve 13 mainly comprises a valve body, a valve block arranged in a valve cavity in the valve body, a first interface 131, a second interface 132, a third interface 133 and a fourth interface 134, wherein the valve block is provided with a first valve position for communicating the first interface 131 with the second interface 132 and communicating the third interface 133 with the fourth interface 134, and a second valve position for communicating the second interface 132 with the third interface 133 and blocking the first interface 131 with the fourth interface 134; the second port 132 is connected to the second inlet 1221 of the second compression cylinder 122, the third port 132 is connected to the first outlet 1211 of the first compression cylinder 121, and the fourth port 134 is connected to the outlet 127 via the fourth port 126.

When the first four-way valve 13 is in the first valve position, the variable capacity compressor 12 operates in a two-cylinder mode, and the flow path of the refrigerant in the variable capacity compressor assembly includes two paths: (1) a refrigerant to be compressed flows in along the first port 123 of the variable displacement compressor 12, and sequentially flows through the first port 123 of the variable displacement compressor 12 → the first inlet 1211 → the first compression cylinder 121 → the first outlet 1212 → the second port 124 of the variable displacement compressor 12 → the third port 133 of the first four-way valve 13 → the valve chamber-the fourth port 134 of the first four-way valve 13 → the fourth port 126 of the variable displacement compressor 12 → the discharge port 127 of the variable displacement compressor 12, and in a refrigerant flow path, the refrigerant is compressed once by the first compression cylinder 121 and is finally output to a refrigerant circulation flow path of the air conditioner through the discharge port 127; (2) the refrigerant to be compressed flows in along the first port 131 of the first four-way valve 13, and sequentially flows through the first port 131 of the first four-way valve 13 → the valve chamber → the second port 132 of the first four-way valve 13 → the third port 125 of the variable displacement compressor 12 → the second inlet 1221 → the second compression cylinder 122 → the second outlet 1222 → the discharge port 127 of the variable displacement compressor 12, and in this refrigerant flow path, the refrigerant is once compressed by the second compression cylinder 122 and finally is output to the refrigerant circulation flow path of the air conditioner through the discharge port 127. In the two refrigerant flow paths, the two compression cylinders of the variable capacity compressor 12 can respectively and independently perform operations of air suction, compression, air exhaust and the like, so that the compression amount of the refrigerant can be effectively increased, and the refrigerant output amount of the compressor can be increased, so as to meet the refrigerant amount requirement when a plurality of heat exchange units of the indoor unit 2 perform operations of refrigeration, heating, dehumidification and the like.

When the first four-way valve 13 is in the second valve position, the variable capacity compressor 12 operates in a two-stage mode, and a flow path of the refrigerant in the variable capacity compressor 12 is one: the refrigerant to be compressed flows in along the first port 123 of the variable displacement compressor 12, and sequentially flows through the first port 123 of the variable displacement compressor 12 → the first inlet 1211 → the first compression cylinder 121 → the first outlet 1222 → the second port 124 of the variable displacement compressor 12-the third port 134 of the first four-way valve 13 → the valve chamber → the second port 132 of the first four-way valve 13 → the third port 125 of the variable displacement compressor 12 → the second inlet 1221 → the second compression cylinder 122 → the second outlet 1222 of the second compression cylinder 122 → the discharge port 127 of the variable displacement compressor 122, and in this refrigerant flow path, the refrigerant is primarily compressed by the first compression cylinder 121, secondarily compressed by the second compression cylinder 122, and finally discharged to the refrigerant circulation flow path of the air conditioner via the discharge port 127. In the above refrigerant flow path, the two compression cylinders of the variable capacity compressor 12 sequentially perform operations of air suction, compression, air discharge, and the like, thereby implementing secondary compression of the refrigerant, and effectively improving the compression ratio of the refrigerant to enhance the heat exchange efficiency of the indoor heat exchanger and the outdoor heat exchanger 11.

In an embodiment, the air conditioner of the present invention further includes a temperature sensor for detecting an indoor temperature and a humidity sensor for detecting an indoor humidity, and the temperature sensor and the humidity sensor may transmit information of the indoor temperature and the indoor humidity detected by the temperature sensor and the humidity sensor to the controller. In addition, the air conditioner further comprises a humidity sensor for detecting the outdoor humidity and a humidity sensor for detecting the outdoor humidity, and the temperature sensor and the humidity sensor can transmit the information of the outdoor temperature and the outdoor humidity detected by the temperature sensor and the humidity sensor 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; when the air conditioner operates in a cooling mode or a dehumidification mode, the refrigerant discharged from the variable capacity compressor 12 flows into the first refrigerant port 111, and after exchanging heat with the outdoor environment in the outdoor heat exchanger 11, the refrigerant flows out of the second refrigerant port 112 and flows to the indoor heat exchangers of the two heat exchange units of the indoor unit 2 to continue exchanging heat with the indoor environment; in the heating mode of the air conditioner, the refrigerant discharged from the indoor heat exchangers of the two heat exchange units flows into the outdoor heat exchanger 11 through the second refrigerant port 112, and after the heat exchange with the outdoor environment in the outdoor heat exchanger 11, the refrigerant flows out of the first refrigerant port 111 and flows to the variable capacity compressor 12, so that the refrigerant is compressed again 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 cooperating with the first heat exchange unit, and a third four-way valve 15 and a second gas-liquid separator 17 for cooperating with the second heat exchange unit; 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, 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 exchange heat with an indoor environment independently.

The first indoor heat exchanger 21 is connected to the outdoor heat exchanger 11, the first gas-liquid separator 16, and the variable displacement compressor 12 via the second four-way valve 14, and forms a first refrigerant circulation flow path.

The structure and the connection mode of each part of the first refrigerant circulation flow path are as follows: the first indoor heat exchanger 21 includes a first refrigerant port 211 and a second refrigerant port 212; the first gas-liquid separator 16 includes a first inlet 161 and a first outlet 162; the second four-way valve 14 includes a valve body, a valve block disposed in a valve cavity in the valve body, and a first port 141, a second port 142, a third port 143, and a fourth port 144, where the valve block has a first valve position for communicating the first port 141 and the second port 142, and the third port 143 and the fourth port 144, and a second valve position for communicating the second port 142 and the third port 143, and the first port 141 and the fourth port 144; a first port 141 of the second four-way valve 14 is connected to the first refrigerant port 211 of the first indoor heat exchanger 21, a second port 142 is connected to the first inlet 161 of the first gas-liquid separator 16, a third port 143 is connected to the first refrigerant port 111 of the outdoor heat exchanger 11, and a fourth port 144 is connected to the discharge port 127 of the variable capacity compressor 12; the second refrigerant port 212 of the first indoor heat exchanger 21 is connected to the second refrigerant 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 operates in a cooling mode or a dehumidification mode, the valve block of the second four-way valve 14 is at the first valve position, and the refrigerant flow sequence of the first refrigerant circulation flow path is shown by a solid arrow in the figure: the discharge port 127 of the variable capacity compressor 12 → the fourth port 144 of the second four-way valve 14 → the valve chamber of the second four-way valve 14 → the third port 143 of the second four-way valve 14 → the first refrigerant port 111 of the outdoor heat exchanger 11 → the second refrigerant port 112 of the outdoor heat exchanger 11 → the second refrigerant port 212 of the first indoor heat exchanger 21 → the first refrigerant port 211 of the first indoor heat exchanger 21 → the first port 141 of the second four-way valve 14 → the valve chamber of the second 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 outlet 162 of the first gas-liquid separator 161 → the first port 131 of the first four-way valve 13, the refrigerant is returned to the variable capacity compressor 12 via the first four-way valve 13 to be compressed, thereby realizing a continuous flow of the refrigerant through the entire refrigerant circulation flow path.

When the first heat exchange unit of the air conditioner operates in the heating mode, the valve port of the second four-way valve 14 is at the second valve position, and the refrigerant flowing sequence of the first refrigerant circulating flow path is as shown by the dotted arrow in the figure: the discharge port 127 of the variable capacity compressor 12 → the fourth port 144 of the second four-way valve 14 → the valve chamber of the second four-way valve 14 → the first port 141 of the second four-way valve 14 → the first refrigerant port 211 of the first indoor heat exchanger 21 → the second refrigerant port 212 of the first indoor heat exchanger 21 → the second refrigerant port 112 of the outdoor heat exchanger 11 → the first refrigerant port 111 of the outdoor heat exchanger 11 → the third port 143 of the second four-way valve 14 → the valve chamber of the second 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 outlet 162 of the first gas-liquid separator 16 → the first port 131 of the first four-way valve 13, the refrigerant is returned to the variable capacity compressor 12 via the first four-way valve 131 to be compressed, thereby realizing a continuous flow of the refrigerant through the entire refrigerant circulation flow path.

The second indoor heat exchanger 22 is connected to the outdoor heat exchanger 11, the second gas-liquid separator 17, and the variable displacement compressor 12 via the third four-way valve 15, and forms a second refrigerant circulation flow path.

The structure and the connection mode of each part of the second refrigerant circulation flow path are as follows: the second indoor heat exchanger 22 includes a first refrigerant port 221 and a second refrigerant port 222; the second gas-liquid separator 17 includes a second inlet 171 and a second outlet 172; the third four-way valve 15 comprises a valve body, a valve block arranged in a valve cavity in the valve body, a first interface 151, a second interface 152, a third interface 153 and a fourth interface 154, wherein the valve block is provided with a first valve position communicated with the first interface 151 and the second interface 152 and the third interface 153 and the fourth interface 154, and a second valve position communicated with the second interface 152 and the third interface 153 and the first interface 151 and the fourth interface 154; a first interface 151 of the third four-way valve 15 is connected with a first refrigerant port 221 of the second indoor heat exchanger 22, a second interface 152 is connected with a second inlet 171 of the second gas-liquid separator 17, and a third interface 153 is respectively connected with a first refrigerant port 111 and a second refrigerant port 112 of the outdoor heat exchanger 11, so that for convenience of distinguishing, a refrigerant pipeline between the third interface 153 and the first refrigerant port 111 of the outdoor heat exchanger 11 is defined as a first refrigerant branch 181, and a refrigerant pipeline between the third interface 153 and the second refrigerant port 112 of the outdoor heat exchanger 11 is defined as a second refrigerant branch 182; fourth port 154 is connected to discharge port 127 of variable displacement compressor 12; the second refrigerant port 222 of the second indoor heat exchanger 22 is connected to the second refrigerant port 112 of the outdoor heat exchanger 11; the second outlet 172 of the second gas-liquid separator 17 is connected to the first inlet 1211 of the first compression cylinder 121.

In an embodiment, a first solenoid valve 191 is disposed on the first refrigerant branch 181 between the third interface 153 of the third four-way valve 15 and the first refrigerant port 111 of the outdoor heat exchanger 11, and the first solenoid valve 191 may be used to control to conduct or block the first refrigerant branch 181; a second solenoid valve 192 is disposed on the second refrigerant branch 182 between the third interface 153 of the third four-way valve 15 and the second refrigerant port 112 of the outdoor heat exchanger 11, and the second solenoid valve 192 may be used to connect or block the second refrigerant branch 182; a third solenoid valve 193 is disposed on the refrigerant pipeline between the second refrigerant port 222 of the second indoor heat exchanger 22 and the second refrigerant port 112 of the outdoor heat exchanger 11, and is used for connecting or blocking the refrigerant pipeline.

When the second heat exchange unit of the air conditioner operates in the cooling mode or the dehumidification mode, the valve block of the third four-way valve 15 is at the first valve position, the first electromagnetic valve 191 on the first refrigerant branch 181 is opened, the second electromagnetic valve 182 on the second refrigerant branch 182 is closed, and then the refrigerant flowing sequence of the second refrigerant circulation flow path is as shown by the solid arrow in the figure: the discharge 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 first refrigerant branch 181 → the first refrigerant port 111 of the outdoor heat exchanger 11 → the second refrigerant port 112 of the outdoor heat exchanger 11 → the second refrigerant port 222 of the second indoor heat exchanger 22 → the first refrigerant port 221 of the second indoor heat exchanger 22 → the first port 153 of the third four-way valve 15 → the valve chamber 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 outlet 172 of the first gas-liquid separator 17 → the first port 123 of the variable capacity compressor 12, the refrigerant is returned to the variable capacity compressor 12 again to be compressed, thereby realizing the continuous flow of the refrigerant in the entire refrigerant circulation flow path.

When the second heat exchange unit of the air conditioner operates in the heating mode, the valve block of the third four-way valve 15 is in the second valve position, the first electromagnetic valve 191 on the first refrigerant branch 181 is opened, the second electromagnetic valve 192 on the second refrigerant branch 182 is closed, and then the refrigerant flow sequence of the second refrigerant circulation flow path is as shown by the dotted arrow in the figure: the discharge 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 first port 151 of the third four-way valve 15 → the first refrigerant port 221 of the second indoor heat exchanger 22 → the second refrigerant port 222 of the second indoor heat exchanger 22 → the second refrigerant port 112 of the outdoor heat exchanger 11 → the first refrigerant 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 chamber 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 outlet 172 of the second gas-liquid separator 17 → the first port 123 of the variable capacity compressor 12, the refrigerant is returned to the variable capacity compressor 12 again to be compressed, thereby realizing the continuous flow of the refrigerant in the entire refrigerant circulation flow path.

In addition, the second refrigerant circulation flow path of the present invention may also be used for defrosting the outdoor heat exchanger 11 of the air conditioner in winter, that is, the second heat exchange unit may also execute a defrosting mode, when the second heat exchange unit executes the defrosting mode, the valve block of the third four-way valve 15 is at the first valve position, the first solenoid valve 191 on the first refrigerant branch 181 is closed, the second solenoid valve 192 on the second refrigerant branch 182 is opened, the third solenoid valve 193 is closed, at this time, the second four-way valve 14 of the first refrigerant circulation flow path is at 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 is: the discharge 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 refrigerant port 112 of the outdoor heat exchanger 11 → the first refrigerant port 111 of the outdoor heat exchanger 11 → the third port 153 of the second four-way valve 14 → the valve chamber of the second 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 outlet 162 of the first gas-liquid separator 16 → the first port 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, the high-temperature refrigerant directly flows into the outdoor heat exchanger 11 to achieve defrosting of the outdoor heat exchanger 11, and the refrigerant with a reduced temperature after defrosting flows back to the variable capacity compressor 12 along a part of the pipeline of the first refrigerant circulation flow path again to be compressed, thereby achieving continuous flow of the refrigerant in the entire refrigerant circulation flow path.

A first throttle valve 23 is arranged on a refrigerant pipeline between the second refrigerant port 211 of the first indoor heat exchanger 21 and the second refrigerant port 112 of the outdoor heat exchanger 11 and is used for throttling the refrigerant flowing into the first indoor heat exchanger 21; a second throttle valve 24 is disposed in a refrigerant line between the second refrigerant port 222 of the second indoor heat exchanger 22 and the second refrigerant port 112 of the exterior heat exchanger 11, and is configured to throttle the refrigerant flowing into the second indoor heat exchanger 22.

Optionally, in order to facilitate connection between the pipelines of the two refrigerant circulation flow paths 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 in parallel with the first refrigerant branch 181, so that the refrigerant can flow into the outdoor heat exchanger 11 after converging in the cooling or dehumidifying mode, or the refrigerant of the outdoor heat exchanger 11 can be divided into two pipelines in the heating mode; meanwhile, the refrigerant pipeline between the second refrigerant port 212 of the first indoor heat exchanger 21 and the second refrigerant port 112 of the outdoor heat exchanger 11 is connected in parallel with the refrigerant pipeline between the second refrigerant port 222 of the second indoor heat exchanger 22 and the second refrigerant port 112 of the outdoor heat exchanger 11, and one end of the second refrigerant branch 182 is also connected in parallel with the parallel connection pipeline section at the second refrigerant port 112 of the outdoor heat exchanger 11.

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, the first interface 131 is blocked, and the first refrigerant circulation flow path is also blocked, so that when the variable capacity compressor operates in the two-stage mode, the air conditioner realizes the operation processes of cooling, heating, dehumidifying and the like on the indoor environment through the second refrigerant circulation flow path where the second heat exchange unit is located.

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

Claims

1. A control method of an air conditioner, characterized in that the control method comprises:

acquiring indoor temperature, target refrigerating temperature set by a user and sleep time period;

when the indoor temperature is not greater than a preset indoor temperature threshold value, controlling the air conditioner to operate in a two-stage mode, wherein the two-stage mode comprises an operation mode that two compression cylinder bodies of a variable-capacity compressor of the air conditioner compress refrigerants in sequence; when the indoor temperature is higher than a preset indoor temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode;

determining a first temperature difference value between the indoor temperature and the target refrigeration temperature;

and when the first temperature difference value is not greater than a preset temperature difference threshold value and the air conditioner is in sleep time interval operation, controlling the first heat exchange unit to stop operation and the second heat exchange unit to operate in a refrigeration mode.

2. The control method according to claim 1, characterized by further comprising:

determining a second temperature difference value between the indoor temperature and the indoor temperature threshold;

and adjusting the working frequency of the variable-capacity compressor according to the second temperature difference value.

3. The control method according to claim 2, wherein the adjusting of the operating frequency of the variable capacity compressor according to the second temperature difference value comprises:

at 0 ≤ Δ T₂＜T₂While controlling the variable capacity compressor to a first operating frequency H₁Running;

at T₂≤ΔT₂While controlling the variable capacity compressor to have a second operating frequency H₂Running;

wherein, Delta T₂Is the second temperature difference value, T₂Is a preset first temperature threshold, H₁＜H₂。

4. The control method according to claim 1, characterized by further comprising:

determining a third temperature difference value between the first temperature difference value and the temperature difference threshold value;

and adjusting the rotating speed of a driving fan of the second heat exchange unit according to the third temperature difference value.

5. The control method according to claim 4, wherein the rotating speed of the driving fan of the first heat exchange unit is adjusted according to the third temperature difference value, and the process comprises the following steps:

at T₃≤ΔT₃In the process, the driving fan of the second heat exchange unit is controlled to rotate at a second rotating speed R₁₂Running;

wherein, Delta T₃Is the third temperature difference value, T₃Is a preset second temperature threshold, R₁₁＜R₁₂。

6. An air conditioner is characterized in that the air conditioner is provided with a variable capacity compressor (12) and a controller, the operation modes of the variable capacity compressor (12) comprise a two-stage mode and a two-cylinder mode, an indoor unit of the air conditioner at least comprises a first heat exchange unit and a second heat exchange unit which are connected in parallel and respectively provided with an independent heat exchanger, and when the variable capacity compressor operates in the two-stage mode, a refrigerant flow path of the first heat exchange unit is in a blocking state; the air conditioner further comprises a temperature sensor for detecting the indoor temperature; the controller is configured to:

acquiring the indoor temperature, a target refrigerating temperature set by a user and a sleep time period;

when the indoor temperature is not greater than a preset indoor temperature threshold value, controlling a variable capacity compressor of the air conditioner to operate in a two-stage mode, wherein the two-stage mode comprises an operation mode that two compression cylinder bodies of the variable capacity compressor of the air conditioner compress refrigerants in sequence; when the indoor temperature is higher than a preset indoor temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode; and

and when the first temperature difference value is not greater than a preset temperature difference threshold value and the air conditioner is in sleep time interval operation, controlling the first heat exchange unit to stop operation, and operating the second heat exchange unit in a refrigeration mode.

7. The air conditioner according to claim 6, comprising an outdoor unit (1),

the outdoor unit (1) comprises a variable capacity compressor assembly and an outdoor heat exchanger (11), wherein the variable capacity compressor assembly comprises a variable capacity compressor (12) and a first four-way valve (13);

the outdoor heat exchanger (11) comprises a first refrigerant port (111) and a second refrigerant port (112);

the variable capacity compressor (12) comprising a first compression cylinder (121) and a second compression cylinder (122), the first compression cylinder (121) having a first inlet (1211) and a first outlet (1212), the second compression cylinder (122) having a second inlet (1221) and a second outlet (1222), wherein the second outlet (1222) of the second compression cylinder (122) is in communication with an outlet (127) of the variable capacity compressor (12);

the first four-way valve (13) comprises a valve body, a valve block arranged in a valve cavity in the valve body, a first interface (131), a second interface (132), a third interface (133) and a fourth interface (134), wherein the valve block is provided with a first valve position for communicating the first interface (131) with the second interface (132) and communicating the third interface (133) with the fourth interface (134), a second valve position for communicating the second interface (132) with the third interface (133) and blocking the first interface (131) from the fourth interface (134);

wherein the second port (132) is in communication with the second inlet port (1221), the third port (133) is in communication with the first outlet port (1212), and the fourth port (134) is in communication with the outlet port (127);

the controlling of the variable capacity compressor of the air conditioner to operate in a two-stage mode includes: and a valve block for controlling the first four-way valve (13) is switched to the second valve position.

8. The air conditioner according to claim 7, wherein the outdoor unit further comprises second and third four-way valves (14, 15), and first and second gas-liquid separators (16, 17);

the indoor unit (2) comprises a first heat exchange unit and a second heat exchange unit, wherein the first heat exchange unit comprises a first indoor heat exchanger (21), and the second heat exchange unit comprises a second indoor heat exchanger (22);

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 circulating flow path;

wherein the first indoor heat exchanger (21) includes a first refrigerant port (211) and a second refrigerant port (212); the first gas-liquid separator (16) comprising a first inlet (161) and a first outlet (162); the second four-way valve (14) comprises a valve body, a valve block arranged in a valve cavity in the valve body, a first interface (141), a second interface (142), a third interface (143) and a fourth interface (144), wherein the valve block is provided with a first valve position communicated with the first interface (141) and the second interface (142) and the third interface (143) and the fourth interface (144), a second valve position communicated with the second interface (142) and the third interface (143) and the first interface (141) and the fourth interface (144);

a first port (141) of the second four-way valve (14) is connected to a first refrigerant port (211) of the first indoor heat exchanger (21), a second port (142) is connected to a first inlet (161) of the first gas-liquid separator (16), a third port (143) is connected to a first refrigerant port (111) of the outdoor heat exchanger (11), and a fourth port (144) is connected to an exhaust port (127) of the variable capacity compressor (12);

a second refrigerant port (212) of the first indoor heat exchanger (21) is connected with a second refrigerant port (112) of the outdoor heat exchanger (11);

the first outlet (162) of the first gas-liquid separator (16) is connected to a first port (131) of the first four-way valve (13).

9. The air conditioner according to claim 8,

the second indoor heat exchanger (22) is connected 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) to form a second refrigerant circulating flow path;

wherein the second indoor heat exchanger (22) includes a first refrigerant port (221) and a second refrigerant port (222); the second gas-liquid separator (17) comprises a second inlet (171) and a second outlet (172); the third four-way valve (15) comprises a valve body, a valve block arranged in a valve cavity in the valve body, a first interface (151), a second interface (152), a third interface (153) and a fourth interface (154), wherein the valve block is provided with a first valve position communicated with the first interface (151) and the second interface (152) and the third interface (153) and the fourth interface (154), a second valve position communicated with the second interface (152) and the third interface (153) and the first interface (151) and the fourth interface (154);

a first interface (151) of the third four-way valve (15) is connected with a first refrigerant port (221) of the second indoor heat exchanger (22), a second interface (152) is connected with a second inlet (171) of the second gas-liquid separator (17), a third interface (153) is respectively connected with a first refrigerant port (111) and a second refrigerant port (112) of the outdoor heat exchanger (11), and a fourth interface (154) is connected with an exhaust port (127) of the variable capacity compressor (12);

a second refrigerant port (222) of the second indoor heat exchanger (22) is connected with a second refrigerant port (112) of the outdoor heat exchanger (11);

the second outlet (172) of the second gas-liquid separator (17) is connected with the first inlet (1211) of the first compression cylinder (121);

a first electromagnetic valve (191) is arranged on a refrigerant pipeline between the third interface (153) of the third four-way valve (15) and the first refrigerant port (111) of the outdoor heat exchanger (11), and a second electromagnetic valve (1920) is arranged on a refrigerant pipeline between the third interface (153) of the third four-way valve (15) and the second refrigerant port (112) of the outdoor heat exchanger (11); a third electromagnetic valve (193) is arranged on a refrigerant pipeline between a second refrigerant port (222) of the second indoor heat exchanger (22) and a second refrigerant port (112) of the outdoor heat exchanger (11); a first throttle valve (23) is arranged on a refrigerant pipeline between a second refrigerant port (212) of the first indoor heat exchanger (21) and a second refrigerant port (112) of the outdoor heat exchanger (11), and a second throttle valve (24) is arranged on a refrigerant pipeline between a second refrigerant port (222) of the second indoor heat exchanger (22) and the second refrigerant port (112) of the outdoor heat exchanger (11).