CN107120785B - Air conditioner and control method - Google Patents

Air conditioner and control method Download PDF

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Publication number
CN107120785B
CN107120785B CN201710239001.5A CN201710239001A CN107120785B CN 107120785 B CN107120785 B CN 107120785B CN 201710239001 A CN201710239001 A CN 201710239001A CN 107120785 B CN107120785 B CN 107120785B
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variable
capacity compressor
temperature
interface
air conditioner
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CN107120785A (en
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罗荣邦
王飞
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
Qingdao Haier Jiaozhou Air Conditioner Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
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Abstract

The invention discloses an air conditioner and a control method, and belongs to the technical field of air conditioners. The air conditioner comprises a controller, a first temperature sensor for detecting the outdoor environment temperature and a variable-capacity compressor assembly for driving refrigerant to circulate, wherein the variable-capacity compressor assembly comprises a variable-capacity compressor, and the operation modes of the variable-capacity compressor comprise a two-stage mode and a double-cylinder mode; the controller is used for: controlling the heating operation of the air conditioner; and when the outdoor environment temperature detected by the first temperature sensor is less than or equal to a first temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode. The air conditioner adopts the variable-capacity compressor, and can flexibly adjust the operation mode of the variable-capacity compressor according to the outdoor temperature, so that the compression efficiency of the variable-capacity compressor on the refrigerant and the output refrigerant quantity can be matched with the current outdoor temperature condition, and the operation energy efficiency of the air conditioner during heating operation is improved.

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 piston compressors, screw compressors, centrifugal compressors, linear compressors and the like, and can be divided into single-cylinder compressors, double-cylinder compressors and multi-cylinder compressors according to the number of compression cylinder bodies in the compressor, wherein for the double-cylinder and multi-cylinder compressors with the number of cylinder bodies not less than one, the compression process is to sequentially perform multi-stage compression operation on the refrigerant according to the connection sequence among a plurality of 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 solve the problem of operation 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: controlling the heating operation of the air conditioner; and when the outdoor environment temperature detected by the first temperature sensor is less than or equal to a first temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode, wherein the double-cylinder mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor independently compress refrigerants.
Further, the control method further comprises: and when the outdoor environment temperature is greater than or equal to a second temperature threshold, controlling the variable-capacity compressor to operate in a two-stage mode, wherein the second temperature threshold is greater than the first temperature threshold, and the two-stage mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor sequentially compress refrigerants.
Further, the control method further comprises: when the outdoor temperature is greater than the first temperature threshold and less than the second temperature threshold, determining an initial target timing duration; determining the difference value of the initial target timing duration minus the preset time interval as the target timing duration; when the timer reaches the target time length, acquiring the target heating temperature set by a user; determining the temperature difference value of the target heating temperature minus the indoor environment temperature detected by the second temperature sensor; and when the temperature difference value is greater than or equal to the preset temperature difference threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode.
Further, the control method further comprises: and when the temperature difference value is smaller than a preset temperature difference threshold value, controlling the variable-capacity compressor to operate in a two-stage mode.
According to a second aspect of the present invention, there is also provided an air conditioner, the air conditioner including a controller, a first temperature sensor for detecting an outdoor ambient temperature, and a variable capacity compressor assembly for driving a refrigerant to circulate, the variable capacity compressor assembly including a variable capacity compressor, operating modes of the variable capacity compressor including a two-stage mode and a two-cylinder mode; the controller is used for: controlling the heating operation of the air conditioner; and when the outdoor environment temperature detected by the first temperature sensor is less than or equal to a first temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode, wherein the double-cylinder mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor independently compress refrigerants.
Further, the variable capacity compressor assembly includes a first four-way valve; the air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a second four-way valve and a throttling device; the variable-capacity compressor assembly is connected with the indoor heat exchanger, the outdoor heat exchanger, the second four-way valve and the throttling device through refrigerant pipelines to form a refrigerant circulating pipeline.
Further, the air conditioner also comprises a gas-liquid separator connected with the refrigerant circulating pipeline, and the gas-liquid separator comprises a first outlet and a second outlet; the variable-capacity compressor comprises a first compression cylinder and a second compression cylinder, 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, the first air inlet is communicated with the first outlet of the gas-liquid separator, and the second air outlet of the second compression cylinder is communicated with the exhaust port 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 first interface is communicated with a second outlet of the gas-liquid separator, the second interface is communicated with a second gas inlet, the third interface is communicated with a first gas outlet, and the fourth interface is communicated with a gas outlet; controlling a variable capacity compressor to operate in a two cylinder mode, comprising: controlling a valve block of the first four-way valve to be switched to a first valve position; controlling a variable capacity compressor 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 gas-liquid separator comprises an inlet; 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 and the fourth interface and the second interface and the third interface, and a second valve position communicated with the first interface and the second interface and the third interface and the fourth interface; the first interface is communicated with the outdoor heat exchanger, the second interface is communicated with the outlet of the gas-liquid separator, the third interface is communicated with the indoor heat exchanger, and the fourth interface is communicated with the exhaust port; when the air conditioner is in heating operation, the valve block of the second four-way valve is in the second valve position.
The air conditioner adopts the variable-capacity compressor, and can flexibly adjust the operation mode of the variable-capacity compressor according to the outdoor temperature, so that the compression efficiency of the variable-capacity compressor on the refrigerant and the output refrigerant quantity can be matched with the current outdoor temperature condition, and the operation energy efficiency of the air conditioner during heating operation is improved.
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 flowchart illustrating a control method of an air conditioner according to 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.
11, an outdoor heat exchanger;
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 and the second four-way valve are arranged at a plurality of interfaces, the interfaces with the same name of different four-way valves are distinguished by adopting different reference numerals, and the method comprises the following specific 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;
16. a gas-liquid separator; 161. a first outlet; 162. a second outlet;
21. an indoor heat exchanger; 22. a throttling device.
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. 2, the present invention provides an air conditioner, which includes an indoor unit and an outdoor unit, wherein the outdoor unit is provided with a first temperature sensor for detecting an outdoor environment temperature, so as to detect a current outdoor environment temperature in real time; meanwhile, the outdoor unit is also provided with a variable capacity compressor assembly for driving the refrigerant to circulate, and the variable capacity compressor assembly can compress the refrigerant in the refrigerant circulation pipeline of the air conditioner and provides power for the refrigerant to circularly flow between the indoor unit and the outdoor unit.
The variable capacity compressor assembly includes a variable capacity compressor 12, in an embodiment, the variable capacity compressor 12 includes at least two compression cylinders, and each compression cylinder can independently perform a compression operation on a refrigerant; when the air conditioner operates under different temperature and humidity working conditions, the air conditioner also has corresponding requirements on the refrigerant flowing in the refrigerant circulation pipeline, for example, when the indoor and outdoor temperature is lower in winter, a compressor is required to output more refrigerants in order to accelerate the heating efficiency of the air conditioner; or when the indoor temperature is close to the heating temperature set by the user in winter, the compressor is required to compress the refrigerant at a higher compression ratio in order to improve the energy efficiency of the air conditioner. Therefore, the operation modes of the variable capacity compressor 12 adopted by the invention comprise a two-stage mode and a two-cylinder mode, wherein when the variable capacity compressor 12 operates in the two-stage mode, the refrigerant flowing through the variable capacity compressor 12 is sequentially compressed by each compression cylinder body, and the refrigerant subjected to multi-stage compression is output to the refrigerant circulation pipeline, so that the compression ratio of the refrigerant can be improved, and the two-stage mode is suitable for the conditions of small temperature difference or small humidity difference; when the variable-capacity compressor 12 operates in the double-cylinder mode, the refrigerant flowing through the variable-capacity compressor 12 is independently compressed by each compression cylinder body, the refrigerants compressed by each compression cylinder body are not communicated with each other, and after each compression cylinder body completes compression, the compressed refrigerants are independently output to the refrigerant circulation pipeline.
Due to the variability of indoor and outdoor environmental factors, the working conditions of the air conditioner during operation are different, for example, in severe cold weather conditions in winter, the outdoor environment temperature is low, and the heat exchange quantity between the heat exchanger of the outdoor unit and the outdoor environment is directly influenced; or, in the two time periods of day and night in winter, the outdoor environment temperature changes greatly, so that the compressor of the conventional air conditioner can not meet the refrigerant requirement under the current working condition when operating in a single mode. Therefore, in order to meet the refrigerant requirements under different working conditions, in a plurality of embodiments of the present invention, as shown in fig. 2, taking the winter heating working condition as an example, the present invention further provides a control method of an air conditioner, where the control method at least includes the following steps: s101, controlling the heating operation of the air conditioner; s102, when the outdoor environment temperature acquired by the temperature sensor is smaller than or equal to a first temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode, wherein the double-cylinder mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor independently compress refrigerants.
The controller of the air conditioner can control the variable-capacity compressor 12 to switch the modes of double-cylinder compression, double-stage compression and the like according to different outdoor environment temperatures, and not only can meet the requirements of rated heating capacity and energy efficiency, but also can meet the requirement of large heating capacity at low temperature.
In the above embodiment, the air conditioner operates in the heating mode in winter, and the flow sequence of the refrigerant in the refrigerant circulation pipeline is as follows: the variable capacity compressor assembly → the indoor heat exchanger 21 of the indoor unit → the outdoor heat exchanger 11 of the outdoor unit → the variable capacity compressor assembly, wherein the refrigerant absorbs heat from the outdoor environment in the outdoor heat exchanger 11 of the outdoor unit, and releases heat to the indoor environment in the indoor heat exchanger 21 of the indoor unit, thereby achieving the purpose of heating and warming the indoor environment.
In the winter heating working condition, the outdoor environment temperature is detected by a first temperature sensor arranged on the outdoor unit in real time, and the first temperature sensor transmits the detected parameters such as the outdoor environment temperature to the controller, so that the controller can conveniently switch and adjust the operation mode of the variable-capacity compressor 12; in addition, the number of times of the control process executed by the controller under the heating working condition in winter is one or more, so that when the controller executes the control process for the nth time, the first temperature sensor can transmit the real-time outdoor environment temperature corresponding to the current control process for the N times to the air conditioner, and the controller can conveniently perform adaptive adjustment on the variable capacity compressor 12 mode switched by the control process for the N-1 st time during the control process for the nth time, so that the operation mode of the variable capacity compressor 12 can be adapted to the current working conditions of different time points or time periods during the operation process of the air conditioner in a longer time period.
In step S102, the first temperature threshold is a threshold parameter pre-stored in the controller, for example, the first temperature threshold stored in the controller may be 2 ℃, 3 ℃, 5 ℃, and so on, that is, the first temperature threshold is a temperature parameter with a lower temperature in winter that may affect the heat exchange between the outdoor heat exchanger 11 and the outdoor environment, and therefore the first temperature threshold is used as a critical condition for determining the operation mode of the variable capacity compressor 12.
Meanwhile, in step S102, when the outdoor ambient temperature is less than or equal to the first temperature threshold, it may be determined that the outdoor low temperature condition may limit the heat exchange amount of the outdoor heat exchanger 11, and thus the variable capacity compressor 12 needs to operate in a mode of outputting more refrigerants. For example, the first temperature threshold set by the air conditioner is 3 ℃, after the air conditioner is started to perform heating operation, the outdoor environment temperature detected by the first temperature sensor is 1 ℃, the judgment condition that the outdoor environment temperature is less than or equal to the first temperature threshold is met, the controller controls the variable-capacity compressor 12 to operate in a two-cylinder mode, the two compression cylinders perform refrigerant compression operation independently, and the refrigerant quantity which is twice as large as that of a single compression cylinder is output to the refrigerant circulation pipeline, so that the refrigerant quantity flowing through the outdoor heat exchanger 11 is increased, and the heat exchange quantity between the air conditioner and the outdoor environment is improved.
In the embodiment of the present invention, the control flow of the control method further includes step S103, when the outdoor ambient temperature is greater than or equal to a second temperature threshold, controlling the variable capacity compressor to operate in a two-stage mode, where the second temperature threshold is greater than the first temperature threshold, and the two-stage mode includes an operation mode in which two compression cylinders of the variable capacity compressor sequentially compress a refrigerant.
In step S103, the second temperature threshold is also a threshold parameter pre-stored in the controller, for example, the second temperature threshold stored in the controller may be 5 ℃, 7 ℃, and so on, i.e. the first temperature threshold is a temperature parameter with moderate winter temperature and not causing large heat exchange between the outdoor heat exchanger 11 and the outdoor environment, and therefore the second temperature threshold is also used as another critical condition for determining the operation mode of the variable capacity compressor 12.
In different air conditioner models, the controller stores one or more threshold combinations of the first temperature threshold and the second temperature threshold, for example, threshold combination 1 (first temperature threshold 2 ℃, second temperature threshold 5 ℃), threshold combination 2 (first temperature threshold 3 ℃, second temperature threshold 7 ℃), and so on. In each threshold combination, the second temperature threshold is greater than the first temperature threshold, so as to avoid the problem that the subsequent operation mode of the variable displacement compressor 12 cannot be determined due to the same numerical value of the first temperature threshold and the second temperature threshold.
In the embodiment of the invention, the air conditioner further comprises a second temperature sensor for detecting the indoor environment temperature, and the second temperature sensor can be arranged at the air inlet of the indoor unit, so that the detected indoor environment temperature parameter is close to or the same as the current indoor environment temperature.
Meanwhile, the control method further comprises the following steps: s104, when the outdoor temperature is greater than the first temperature threshold and less than the second temperature threshold, determining an initial target timing duration; determining the difference value of the initial target timing duration minus the preset time interval as the target timing duration; when the timer reaches the target time length, acquiring the target heating temperature set by a user; s105, determining a temperature difference value of the target heating temperature minus the indoor environment temperature detected by the second temperature sensor; and S106, controlling the variable-capacity compressor to operate in a double-cylinder mode when the temperature difference value is larger than or equal to the preset temperature difference threshold value.
In step S104, when it is determined whether the outdoor temperature is greater than the first temperature threshold and less than the second temperature threshold, the first temperature threshold and the second temperature threshold are threshold parameters in the same threshold combination in the foregoing embodiment, for example, the threshold combination 1 and the threshold combination 2 in the foregoing embodiment are stored in the controller, and the outdoor ambient temperature detected by the first temperature sensor is Tao, in the process of executing step S104 by the controller each time, the outdoor ambient temperature Tao can only be compared with the threshold parameters in one of the threshold combination 1 and the threshold combination 2, and when the controller executes the above control flow for multiple times, to improve the accuracy of the control process, in step S104, the threshold combinations in the same group are generally used.
In step S104, when the air conditioner is started and operated, and the acquired outdoor environment temperature is greater than the first temperature threshold and less than the second temperature threshold, the variable displacement compressor 12 is defaulted to be operated in the mode of the variable displacement compressor 12 in the previous operation of the air conditioner.
Meanwhile, determining an initial target timing duration, and determining a difference value between the initial target timing duration and a preset time interval as a target timing duration, where the preset time interval may be executed according to a preset time interval stored in the controller in advance, for example, setting an order of an indoor environment temperature repeatedly acquired by the air conditioner and a target heating temperature set by a user to be 1, 2, 3, … …, n, an order of an indoor environment temperature repeatedly acquired by the air conditioner when the air conditioner is started to be 1, and setting the preset time interval to be 5min, when the order 2 is executed, the initial target timing duration is 30min, the target timing duration is 25min, that is, after executing step S105 and step S106 of the order 1, if a condition that a variable capacity compressor of the air conditioner operates in a two-cylinder mode is not met, the order 2 is executed after 25min, and steps S105 and S106 are repeated; if the condition that the variable capacity compressor of the air conditioner is operated in the two-cylinder mode is satisfied, the steps related to the subsequent sequence 2, 3, … …, n do not need to be continuously performed. Similarly, when the execution sequence 2 does not satisfy the condition that the variable capacity compressor of the air conditioner operates in the two-cylinder mode, the initial target timing length determined in step S104 of the sequence 3 is the target timing length of the sequence 2, that is, the initial target timing length of the sequence 3 is 25min, the calculated target timing length is 20min, and so on.
In step S105, the temperature difference between the target heating temperature and the indoor ambient temperature is generally an absolute value thereof, for the convenience of comparison of values in the subsequent determination step.
In step S106, the temperature difference threshold is also a threshold parameter pre-stored in the controller, for example, the temperature difference threshold stored in the controller may be 2 ℃, 3 ℃, 4 ℃, and so on.
The larger the temperature difference between the target heating temperature and the indoor environment temperature is, the larger the temperature difference between the indoor environment temperature and the target heating temperature is, so in step S107, when the temperature difference is greater than or equal to the preset temperature difference threshold, the variable-capacity compressor 12 is controlled to operate in a two-cylinder mode, the two compression cylinders perform refrigerant compression operations independently, and output twice the refrigerant amount of the single compression cylinder to the refrigerant circulation pipeline, thereby increasing the refrigerant amount flowing through the outdoor heat exchanger 11, improving the heat exchange amount between the air conditioner and the outdoor environment, and accelerating the heating process of the air conditioner to the indoor environment.
In the above embodiment of the present invention, the step of the control flow executed by the controller further includes: and S107, when the temperature difference value is smaller than a preset temperature difference threshold value, controlling the variable-capacity compressor 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 sequentially compress refrigerants. The smaller the temperature difference between the target heating temperature and the indoor environment temperature is, the smaller the temperature difference between the indoor environment temperature and the target heating temperature is, so in step S107, when the temperature difference is smaller than the preset temperature difference threshold, the variable capacity compressor 12 is controlled to operate in the two-stage mode, and the two compression cylinder blocks sequentially perform the refrigerant compression operation, so as to improve the compression ratio of the air conditioner to the refrigerant and enhance the heat exchange efficiency between the air conditioner and the outdoor environment.
The following describes a specific working procedure of the control method of the air conditioner in detail with reference to a specific embodiment:
s201, starting an air conditioner to run in a heating mode;
s202, acquiring the current outdoor environment temperature Tao transmitted to the controller by the first temperature sensor, and comparing the current outdoor environment temperature with a first temperature threshold and a second temperature threshold in a threshold combination 1 stored in the controller;
s203, when the outdoor environment temperature is less than or equal to the first temperature threshold value, controlling the variable-capacity compressor 12 to operate in a double-cylinder mode;
s204, when the outdoor environment temperature is greater than or equal to the second temperature threshold value, controlling the variable-capacity compressor 12 to operate in a two-stage mode;
s205, when the indoor and outdoor ambient temperatures are greater than a first temperature threshold and less than a second temperature threshold, the double-cylinder mode operation of the last variable capacity compressor is performed for 30 min; and executing step S206;
in this embodiment, it is assumed that the last variable capacity compressor operates in the dual-cylinder mode until the air conditioner is turned off, and therefore, when the air conditioner is turned on and operated at this time, the default air conditioner still operates in the dual-cylinder mode;
s206, acquiring a target heating temperature Tm set by a user and the current indoor environment temperature Tp transmitted to the controller by the second temperature sensor;
s207, calculating an absolute value | △ t | of a temperature difference value between the target heating temperature and the current indoor environment temperature Tp;
s208, judging whether the absolute value of △ t is greater than or equal to a preset temperature difference threshold value, if the absolute value of △ t is greater than or equal to the preset temperature difference threshold value, controlling the variable-capacity compressor to continuously run in a double-cylinder mode, and executing the step S209, otherwise, executing the step S210;
s209, controlling the variable-capacity compressor to continuously run for 25min in a double-cylinder mode, and repeatedly executing the steps S206 to S208;
when step S208 is executed for the second and subsequent times, if | △ t | is still greater than or equal to the preset temperature difference threshold, when step S209 is executed, the time for controlling the variable capacity compressor to continue to operate with the dual cylinders is sequentially decreased by 5min, for example, the sequential interval time is 20min, 15min, 10min, and the like;
and S210, if the temperature difference value of the △ t is smaller than the preset temperature difference threshold value, controlling the variable capacity compressor to operate in a double-stage mode.
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 indoor heat exchanger 21, an outdoor heat exchanger 11, a second four-way valve 14 and a throttling device 22, wherein the indoor heat exchanger 21, the outdoor heat exchanger 11, the second four-way valve 14, the throttling device 22 and the variable-capacity compression assembly in the embodiment are connected through a refrigerant pipeline to form a refrigerant circulating pipeline in the air conditioner, so that the circulation flow of the refrigerant between an indoor unit and an outdoor unit is realized.
The indoor heat exchanger 21 is used for exchanging heat with an indoor environment, and comprises a heat absorbing unit for absorbing heat of the indoor environment in a summer cooling working condition and a heat releasing unit for releasing heat to the indoor environment in a winter heating working condition; the outdoor heat exchanger 11 is used for exchanging heat in the outdoor environment, and includes transferring the indoor heat absorbed by the indoor heat exchanger 21 to the outdoor heat exchanger 11 through a refrigerant in the summer cooling condition, and discharging the heat to the outdoor environment through the outdoor heat exchanger 11, and absorbing the heat from the outdoor environment in the winter heating condition, and transferring the heat to the indoor heat exchanger 21 through the refrigerant, and discharging the heat to the indoor environment through the indoor heat exchanger 21.
In an embodiment, the air conditioner further includes a gas-liquid separator 16 connected to the refrigerant circulation pipeline, wherein the gas-liquid separator 16 is configured to separate a gaseous refrigerant flowing back to the variable capacity compressor 12 from a liquid refrigerant, and input the gaseous refrigerant to a suction port of the variable capacity compressor 12; in order to ensure that the two compression cylinders can independently suck the refrigerant in the dual-cylinder mode of operation, the gas-liquid separator 16 of the present invention includes a first outlet 161 and a second outlet 162 for respectively delivering the refrigerant to the two compression cylinders of the variable displacement compressor 12.
Alternatively, the gas-liquid separator 16 may be provided with only one refrigerant outlet, and the refrigerant outlet and the two compression cylinders of the variable capacity compressor 12 may be connected by a branch refrigerant pipeline, so that the refrigerant flowing out of the refrigerant outlet may flow into the corresponding compression cylinders along the branch refrigerant pipeline, respectively.
In the embodiment of the present invention, the variable displacement compressor assembly mainly includes a variable displacement compressor 12 and a first four-way valve 13, and the present invention realizes the switching of two operation modes of the variable displacement compressor 12 by switching between different valve positions of the first four-way valve 13.
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 unit of the variable displacement compressor 12, 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, and the second compression cylinder 122 has a second inlet 1221 and a second outlet 1222, wherein the first inlet 1211 communicates with the first outlet 161 of the gas-liquid separator 16, and the second outlet 1222 of the second compression cylinder 122 communicates with the outlet 127 of the variable displacement compressor 12;
the first four-way valve 13 includes a valve body, a valve block disposed in a valve cavity in the valve body, and a first port 131, a second port 132, a third port 133, and a fourth port 134, the valve block having a first valve position for communicating the first port 131 with the second port 132 and communicating the third port 133 with the fourth port 134, and a second valve position for communicating the second port 132 with the third port 133 and blocking the first port 131 from the fourth port 134; the first port 131 is communicated with the second outlet 162 of the gas-liquid separator 16, the second port 132 is communicated with the second inlet 1221, the third port 133 is communicated with the first outlet 1212, and the fourth port 134 is communicated with the exhaust 127.
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 127127; (2) the refrigerant to be compressed flows in along the first port 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 the refrigerant flow path, the refrigerant is primarily compressed by the second compression cylinder 122 and is finally discharged into 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 quantity of the compressor is increased, so as to meet the refrigerant quantity requirement when a plurality of heat exchange units of the indoor unit perform operations such as refrigeration, heating or dehumidification.
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 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 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 12, 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 output to the refrigerant circulation flow path of the air conditioner via the discharge port 127. In the 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, so that secondary compression of the refrigerant is realized, the compression ratio of the refrigerant can be effectively improved, and the heat exchange efficiency of the indoor heat exchanger 21 and the outdoor heat exchanger 11 is enhanced.
Therefore, the controller controls the variable displacement compressor 12 to operate in a two-cylinder mode, specifically, controls the valve block of the first four-way valve 13 to switch to the first valve position; when the variable displacement compressor 12 is controlled to operate in the two-stage mode, the valve block of the first four-way valve 13 is specifically controlled to switch to the second valve position.
In an embodiment of the present invention, the second four-way valve 14 is mainly used for controlling a flow direction of a refrigerant during a refrigeration cycle and a heating cycle, 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, the valve block has a first valve position communicating the first port 141 and the fourth port 144, communicating the second port 142 and the third port 143, and a second valve position communicating the first port 141 and the second port 142, communicating the third port 143 with the fourth port 144; the first port 141 is in communication with the outdoor heat exchanger 11, the second port 142 is in communication with the outlet of the gas-liquid separator 16, the third port 143 is in communication with the indoor heat exchanger 21, and the fourth port 144 is in communication with the exhaust port 127. When the air conditioner operates in a refrigerating mode, a valve block of the second four-way valve 14 is in a first valve position; during heating operation of the air conditioner, the valve block of the second four-way valve 14 is in the second valve position.
Meanwhile, in order to implement the related step flows of the control method disclosed in the foregoing embodiments, the controller of the air conditioner of the present invention is configured to: controlling the heating operation of the air conditioner; and when the outdoor environment temperature detected by the first temperature sensor is less than or equal to a first temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode, wherein the double-cylinder mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor independently compress refrigerants.
In an embodiment, the controller is further configured to: and when the outdoor environment temperature is greater than or equal to a second temperature threshold, controlling the variable-capacity compressor to operate in a two-stage mode, wherein the second temperature threshold is greater than the first temperature threshold, and the two-stage mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor sequentially compress refrigerants.
In an embodiment, the controller is further configured to: when the outdoor temperature is greater than the first temperature threshold and less than the second temperature threshold, determining an initial target timing duration; determining the difference value of the initial target timing duration minus the preset time interval as the target timing duration; when the timer reaches the target time length, acquiring the target heating temperature set by a user; determining the temperature difference value of the target heating temperature minus the indoor environment temperature detected by the second temperature sensor; and when the temperature difference value is greater than or equal to the preset temperature difference threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode.
In an embodiment, the controller is further configured to: and when the temperature difference value is smaller than a preset temperature difference threshold value, controlling the variable-capacity compressor to operate in a two-stage mode.
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 (7)

1. A control method of an air conditioner, characterized in that the control method comprises:
controlling the heating operation of the air conditioner;
when the outdoor environment temperature detected by a first temperature sensor is less than or equal to a first temperature threshold value, controlling a variable-capacity compressor to operate in a double-cylinder mode, wherein the double-cylinder mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor independently compress refrigerants;
when the outdoor environment temperature is greater than or equal to a second temperature threshold, controlling the variable-capacity compressor to operate in a two-stage mode, wherein the second temperature threshold is greater than the first temperature threshold, and the two-stage mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor sequentially compress refrigerants;
and when the outdoor environment temperature is greater than the first temperature threshold and less than the second temperature threshold, and the difference value between the target heating temperature set by the user and the indoor environment temperature detected by the second temperature sensor is greater than or equal to a preset difference threshold, controlling the variable-capacity compressor to operate in the double-cylinder mode.
2. The control method according to claim 1, characterized by further comprising:
when the outdoor environment temperature is greater than the first temperature threshold and less than the second temperature threshold, determining an initial target timing duration;
determining the difference value of the initial target timing duration minus a preset time interval as a target timing duration;
and when the timer reaches the target time length, acquiring the target heating temperature set by the user.
3. The control method according to claim 2, characterized by further comprising:
and when the temperature difference value is smaller than a preset temperature difference threshold value, controlling the variable-capacity compressor to operate in the two-stage mode.
4. An air conditioner is characterized by comprising a controller, a first temperature sensor and a variable capacity compressor assembly, wherein the first temperature sensor is used for detecting the temperature of an outdoor environment, the variable capacity compressor assembly is used for driving a refrigerant to circulate, the variable capacity compressor assembly comprises a variable capacity compressor (12), and the operation modes of the variable capacity compressor (12) comprise a two-stage mode and a two-cylinder mode; the controller is configured to:
controlling the heating operation of the air conditioner;
when the outdoor environment temperature detected by the first temperature sensor is less than or equal to a first temperature threshold value, controlling the variable-capacity compressor to operate in a double-cylinder mode, wherein the double-cylinder mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor independently compress refrigerants;
when the outdoor environment temperature is greater than or equal to a second temperature threshold, controlling the variable-capacity compressor to operate in a two-stage mode, wherein the second temperature threshold is greater than the first temperature threshold, and the two-stage mode comprises an operation mode that two compression cylinder bodies of the variable-capacity compressor sequentially compress refrigerants;
and when the outdoor environment temperature is greater than the first temperature threshold and less than the second temperature threshold, and the difference value between the target heating temperature set by the user and the indoor environment temperature detected by the second temperature sensor is greater than or equal to a preset difference threshold, controlling the variable-capacity compressor to operate in the double-cylinder mode.
5. The air conditioner according to claim 4,
the variable capacity compressor assembly further includes a first four-way valve (13);
the air conditioner also comprises an indoor heat exchanger (21), an outdoor heat exchanger (11), a second four-way valve (14) and a throttling device (22);
the variable-capacity compressor assembly is connected with the indoor heat exchanger (21), the outdoor heat exchanger (11), the second four-way valve (14) and the throttling device (22) through refrigerant pipelines to form a refrigerant circulating pipeline.
6. The air conditioner according to claim 5,
the air conditioner also comprises a gas-liquid separator (16) connected to the refrigerant circulating pipeline, wherein the gas-liquid separator (16) comprises a first outlet (161) and a second outlet (162);
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 gas inlet (1211) and a first gas outlet (1212), the second compression cylinder (122) having a second gas inlet (1221) and a second gas outlet (1222), wherein the first gas inlet (1211) communicates with the first outlet (161) of the gas-liquid separator (16), and the second gas outlet (1222) of the second compression cylinder (122) communicates with a gas 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 first port (131) is in communication with the second outlet (162) of the gas-liquid separator (16), the second port (132) is in communication with the second gas inlet (1221), the third port (133) is in communication with the first gas outlet (1212), and the fourth port (134) is in communication with the gas outlet (127);
the controlling the variable capacity compressor to operate in a two-cylinder mode includes: controlling a valve block of the first four-way valve (13) to switch to the first valve position;
the controlling the variable capacity compressor 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.
7. The air conditioner according to claim 6,
the gas-liquid separator (16) comprises an inlet;
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 fourth interface (144) and the second interface (142) and the third interface (143), and a second valve position communicated with the first interface (141) and the second interface (142) and the third interface (143) and the fourth interface (144); wherein the first port (141) communicates with the outdoor heat exchanger (11), the second port (142) communicates with the outlet of the gas-liquid separator (16), the third port (143) communicates with the indoor heat exchanger (21), and the fourth port (144) communicates with the discharge port (127);
when the air conditioner is in heating operation, the valve block of the second four-way valve (14) is in a second valve position.
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