CN107084547B - Air conditioning system and control method for air conditioning system - Google Patents

Air conditioning system and control method for air conditioning system Download PDF

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Publication number
CN107084547B
CN107084547B CN201710271521.4A CN201710271521A CN107084547B CN 107084547 B CN107084547 B CN 107084547B CN 201710271521 A CN201710271521 A CN 201710271521A CN 107084547 B CN107084547 B CN 107084547B
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China
Prior art keywords
electromagnetic valve
superheat degree
pipeline
air conditioning
conditioning system
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CN201710271521.4A
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CN107084547A (en
Inventor
马东
孙辉
张捷
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Publication of CN107084547A publication Critical patent/CN107084547A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/06—Damage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/09—Improving heat transfers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses an air conditioning system and a control method for the air conditioning system, and belongs to the field of air conditioning. The air conditioning system includes: the indoor heat exchanger, the outdoor heat exchanger, the compressor, the controller and the bypass control pipeline comprise a first electromagnetic valve, a second electromagnetic valve, a first pipeline, a second pipeline and a third pipeline; the first end of the first pipeline is communicated with the second end of the second pipeline through the first electromagnetic valve, and the second end of the first pipeline is respectively communicated with the outdoor heat exchanger and the air suction port of the compressor; the first end of the second pipeline is communicated with the exhaust port of the compressor; the second end of the second pipeline is communicated with the third pipeline through a second electromagnetic valve; the controller is used for controlling the first electromagnetic valve and the second electromagnetic valve according to the suction superheat degree and the operation mode of the air conditioning system. Solves the problems of low heat exchange performance of the air conditioner and low suction superheat degree of the compressor in the prior art.

Description

Air conditioning system and control method for air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a control method for the air conditioning system.
Background
The air source heat pump air conditioner is widely applied in the air conditioning industry, mainly because of the excellent heat exchange performance and the convenience of the installation position, but when the outdoor environment temperature is low in winter and the outdoor environment temperature is high in summer for refrigeration, the heat exchange performance of the air conditioner is low, the air suction superheat degree of the air conditioner compressor is low, the liquid return phenomenon of the compressor is caused, and the burning risk of the compressor is increased.
Disclosure of Invention
The embodiment of the invention provides an air conditioning system and a control method for the air conditioning system, and aims to solve the problems that in the prior art, when the air conditioner has low heat exchange performance, the suction superheat degree of a compressor is low.
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.
In one aspect, an embodiment of the present invention provides an air conditioning system, including: the air conditioning system comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor and a controller, and further comprises a bypass control pipeline, wherein the bypass control pipeline comprises a first electromagnetic valve, a second electromagnetic valve, a first pipeline, a second pipeline and a third pipeline;
the first end of the first pipeline is communicated with the second end of the second pipeline through the first electromagnetic valve, and the second end of the first pipeline is respectively communicated with the outdoor heat exchanger and the air suction port of the compressor;
the first end of the second pipeline is communicated with the exhaust port of the compressor; the second end of the second pipeline is communicated with the third pipeline through a second electromagnetic valve;
the first electromagnetic valve is used for controlling the on and off of the first pipeline;
the second electromagnetic valve is used for controlling the conduction and closing of the second pipeline;
the controller is electrically connected with the first electromagnetic valve and the second electromagnetic valve and is used for controlling the first electromagnetic valve and the second electromagnetic valve according to the air suction superheat degree and the operation mode of the air conditioning system.
Optionally, any one of the air conditioning systems according to the embodiments of the present invention further includes:
a temperature sensor for measuring a suction temperature of the compressor;
a pressure sensor for measuring suction pressure of the compressor;
and the controller is also used for determining the suction superheat according to the suction temperature measured by the temperature sensor and the suction pressure measured by the pressure sensor.
Optionally, in any one of the air conditioning systems of the embodiments of the present invention, the controller is further configured to:
and when the operation mode of the air conditioning system is heating, judging the sizes of the air suction superheat degree and the superheat degree threshold, when the air suction superheat degree is smaller than the superheat degree threshold, opening the first electromagnetic valve, closing the second electromagnetic valve, and when the air suction superheat degree is larger than or equal to the superheat degree threshold, closing the first electromagnetic valve, and opening the second electromagnetic valve.
Optionally, in any one of the air conditioning systems according to the embodiments of the present invention, the controller is further configured to:
judging the sizes of the air suction superheat degree and a superheat degree threshold when the operation mode of the air conditioning system is a refrigeration mode, and closing the first electromagnetic valve and opening the second electromagnetic valve when the air suction superheat degree is smaller than the superheat degree threshold; and when the suction superheat degree is greater than or equal to a superheat degree threshold value, opening the first electromagnetic valve and closing the second electromagnetic valve.
Optionally, any one of the air conditioning systems according to the embodiments of the present invention further includes: a third electromagnetic valve for controlling the conduction and closing of the third pipeline;
the second end of the third pipeline is communicated with the first end of the first pipeline through the third electromagnetic valve, and the first end of the third pipeline is respectively communicated with the indoor heat exchanger and the air suction port of the compressor.
Optionally, in any one of the air conditioning systems according to the embodiments of the present invention, the controller is further configured to:
calculating the operation time when the suction superheat degree meets the suction superheat degree less than the superheat degree threshold value; acquiring the suction superheat degree when the running time exceeds a time threshold; and when the suction superheat degree is smaller than the superheat degree threshold value, opening the third electromagnetic valve.
In another aspect, an embodiment of the present invention provides a control method for an air conditioning system, including:
acquiring an operation mode of an air conditioning system;
acquiring the suction superheat degree;
and controlling the first electromagnetic valve and the second electromagnetic valve according to the acquired operation mode and the acquired suction superheat.
Optionally, an embodiment of the present invention provides any one of control methods, where the controlling the first electromagnetic valve and the second electromagnetic valve according to the acquired operation mode and the acquired suction superheat specifically includes:
when the acquired operation mode is a refrigeration mode, judging whether the suction superheat degree meets a preset condition, if so, closing the first electromagnetic valve, and opening the second electromagnetic valve; otherwise, the first electromagnetic valve is opened, and the second electromagnetic valve is closed;
the preset condition is that the suction superheat degree is smaller than a superheat degree threshold value.
Optionally, an embodiment of the present invention provides any one of control methods, where the method further includes:
calculating the operation time when the suction superheat degree meets the preset condition; judging whether the running time exceeds a time threshold value, and if so, acquiring the suction superheat degree; and judging whether the suction superheat degree is smaller than a superheat degree threshold value, and if so, opening a third electromagnetic valve.
According to the above technical scheme, the controller can be used for controlling the first electromagnetic valve and the second electromagnetic valve according to the suction superheat degree and the operation mode of the air conditioning system. When the air conditioner is operated in a refrigerating mode and the suction superheat degree is low, the second electromagnetic valve is opened, and the first electromagnetic valve is closed; when the air conditioning system operates in a hot mode and the suction superheat degree is low, the first electromagnetic valve is opened, the second electromagnetic valve is closed, so that the suction superheat degree of the air conditioning system is improved, the liquid return phenomenon of the compressor is prevented, and the burning risk of the compressor is reduced.
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 block diagram of an air conditioning system according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a control method for an air conditioning system according to an exemplary embodiment;
FIG. 3 is a flowchart illustrating a control method for an air conditioning system according to an exemplary embodiment;
fig. 4 is a flowchart illustrating a control method for an air conditioning system according to an exemplary embodiment;
fig. 5 is a flowchart illustrating a control method for an air conditioning system according to an exemplary embodiment;
fig. 6 is a flowchart illustrating a control method for an air conditioning system according to an exemplary embodiment.
Reference numerals illustrate: 101. a four-way valve; 102. an indoor heat exchanger; 103. a compressor; 104. an outdoor heat exchanger; 105. a temperature sensor; 106. a pressure sensor; 107. a first electromagnetic valve; 108. a second electromagnetic valve; 109. a first pipeline; 110. a second pipeline; 111. a controller; 112. a third electromagnetic valve; 113. a third pipeline; 114. an electronic expansion 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. The embodiments represent only 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. 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 necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, 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. Various embodiments are described herein in a progressive manner, each embodiment focusing on differences from other embodiments, and identical and similar parts between the various embodiments are sufficient to be seen with each other. The structures, products and the like disclosed in the embodiments correspond to the parts disclosed in the embodiments, so that the description is relatively simple, and the relevant parts refer to the description of the method parts.
In some embodiments of the present invention, the operation modes of the air conditioning system include: a cooling mode and a heating mode.
Fig. 1 is a block diagram illustrating a structure of an air conditioning system according to an exemplary embodiment, and as shown in fig. 1, the air conditioning system includes: four-way valve 101, indoor heat exchanger 102, compressor 103, outdoor heat exchanger 104, electronic expansion valve 114;
wherein, the four-way valve 101 includes: an outlet S of the four-way valve 101, an inlet D of the four-way valve 101, a first interface C of the four-way valve 101, and a second interface E of the four-way valve 101; the compressor 103 includes a discharge port of the compressor 103 and an intake port of the compressor 103; the indoor heat exchanger 102 includes a first interface of the indoor heat exchanger 102 and a second interface of the indoor heat exchanger 102; the outdoor heat exchanger 104 includes a first interface of the outdoor heat exchanger 104 and a second interface of the outdoor heat exchanger 104;
the exhaust port of the compressor 103 is communicated with the first interface of the outdoor heat exchanger 104 through the inlet D of the four-way valve 101 and the first interface C of the four-way valve 101, the exhaust port of the compressor 103 is communicated with the first interface of the indoor heat exchanger 102 through the inlet D of the four-way valve 101 and the second interface E of the four-way valve 101, the air suction port of the compressor 103 is communicated with the first interface of the outdoor heat exchanger 104 through the outlet S of the four-way valve 101 and the first interface C of the four-way valve 101, the air suction port of the compressor 103 is communicated with the first interface of the indoor heat exchanger 102 through the outlet S of the four-way valve 101 and the second interface E of the four-way valve 101, and the second interface of the indoor heat exchanger 102 is communicated with the second interface of the outdoor heat exchanger 104 through the electronic expansion valve 114.
When the air conditioning system works in a refrigerating mode, a high-temperature and high-pressure refrigerant of the compressor 103 sequentially passes through the four-way valve 101, the outdoor heat exchanger 104, the electronic expansion valve 114 and the indoor heat exchanger 102, and then returns to the compressor 103 through the four-way valve 101; when the air conditioning system is in heating operation, the high-temperature and high-pressure refrigerant of the compressor 103 sequentially passes through the four-way valve 101, the indoor heat exchanger 102, the electronic expansion valve 114 and the outdoor heat exchanger 104, and then returns to the compressor 103 through the four-way valve 101. However, when the air conditioning system heats at a lower outdoor ambient temperature in winter or cools at a higher outdoor ambient temperature in summer, a lower degree of superheat of the air conditioning system compressor 103 intake air occurs due to the low heat exchange capacity of the air conditioning system's outdoor heat exchanger 104.
Of course, other reversing structures can be arranged in the air conditioning system to replace the four-way valve 101, so long as the air conditioning system can heat or cool through the reversing structures.
As shown in fig. 2, the embodiment of the present invention further provides an air conditioning system, wherein the indoor heat exchanger 102, the compressor 103, the outdoor heat exchanger 104, the controller 111 and the bypass control line include a first solenoid valve 107, a second solenoid valve 108, a first line 109, a second line 110 and a third line 113;
a first end of the first pipeline 109 is communicated with a second end of the second pipeline 110 through the first electromagnetic valve 107, and the second end of the first pipeline 109 is respectively communicated with the outdoor heat exchanger 102 and the air suction port of the compressor 103;
the first end of the second conduit 110 communicates with the discharge port of the compressor 103; a second end of the second conduit 110 communicates with a third conduit 113 through a second solenoid valve 108;
a first electromagnetic valve 107 for controlling the on and off of the first pipe 109;
a second electromagnetic valve 108 for controlling the conduction and closure of a second pipeline 110;
the controller 111 is electrically connected to the first solenoid valve 107 and the second solenoid valve 108 for controlling the first solenoid valve 107 and the second solenoid valve 108 according to the suction superheat and the operation mode of the air conditioning system.
The controller 111 for controlling the first solenoid valve 107 and the second solenoid valve 108 according to the suction superheat degree and the operation mode of the air conditioning system includes: when the operation mode of the air conditioning system is a cooling mode, and when the suction superheat degree is low, the second electromagnetic valve 108 is opened, and the first electromagnetic valve 107 is closed; when the operation mode of the air conditioning system is a refrigeration mode and the suction superheat degree is high, the first electromagnetic valve 107 is opened, and the second electromagnetic valve 108 is closed; when the operation mode of the air conditioning system is a heating mode and the suction superheat degree is low, the first electromagnetic valve 107 is opened, and the second electromagnetic valve 108 is closed; when the operation mode of the air conditioning system is the heating mode and the suction superheat is high, the second electromagnetic valve 108 is opened, and the first electromagnetic valve 107 is closed.
As shown in fig. 2, taking air conditioning system operation refrigeration as an example, when the suction superheat is less than the superheat threshold, the second solenoid valve 108 may be controlled to open and the first solenoid valve 107 may be controlled to close. At this time, a part of the high-temperature and high-pressure gaseous refrigerant of the compressor 103 flows into the outdoor heat exchanger 104, and the other part flows back to the air suction port of the compressor 103 through the second pipeline 110, so as to raise the suction superheat of the compressor 103, prevent the liquid return phenomenon of the compressor 103, and reduce the risk of burning the compressor 103. When the suction superheat is greater than the superheat threshold, the first solenoid valve 107 may be controlled to open and the second solenoid valve 108 may be controlled to close. At this time, a part of the high-temperature and high-pressure gaseous refrigerant of the compressor 103 directly flows into the outdoor heat exchanger 104 through the first pipe 109. Since the high-temperature and high-pressure refrigerant entering the outdoor heat exchanger 104 through the first pipeline 109 does not pass through other structures, the pressure loss of the refrigerant is reduced, the inlet side pressure of the outdoor heat exchanger 104 is further improved, the heat exchange efficiency of the outdoor heat exchanger 104 is improved, and the running capacity of an air conditioning system is improved.
According to the above-described aspects, the controller 111 may be configured to control the first solenoid valve 107 and the second solenoid valve 108 according to the suction superheat degree and the operation mode of the air conditioning system. When the air conditioner is operated in the refrigeration mode and the suction superheat degree is low, the first electromagnetic valve 107 is closed, and the second electromagnetic valve 108 is opened; when the air conditioning heating mode is operated and the suction superheat degree is low, the first electromagnetic valve 107 is opened, and the second electromagnetic valve 108 is closed, so that the suction superheat degree of the air conditioning system is improved, the liquid return phenomenon of the compressor 103 is prevented, and the burning risk of the compressor 103 is reduced.
As shown in fig. 2, the air conditioning system according to the embodiment of the present invention further includes: the four-way valve 101, the second end of the first pipeline 109 is communicated with the four-way valve 101 through a third electromagnetic valve 113; a second end of the second line 110 communicates with the four-way valve 101 through a second solenoid valve.
Wherein, the exhaust port of the compressor 103 is communicated with the first interface of the indoor heat exchanger 102 through the four-way valve 101, the exhaust port of the compressor 103 is communicated with the first interface of the outdoor heat exchanger 104 through the four-way valve 101, the air suction port of the compressor 103 is communicated with the first interface of the indoor heat exchanger 102 through the four-way valve 101, and the air suction port of the compressor 103 is communicated with the first interface of the outdoor heat exchanger 104 through the four-way valve 101.
The first interface of the outdoor heat exchanger 104 is communicated with the first interface C of the four-way valve 101, the first interface of the indoor heat exchanger 102 is communicated with the second interface E of the four-way valve 101, the outlet S of the four-way valve 101 is communicated with the air suction port of the compressor 103, and the inlet D of the four-way valve 101 is communicated with the air discharge port of the compressor 103.
The exhaust port of the compressor 103 is communicated with the first interface of the outdoor heat exchanger 104 through the inlet D of the four-way valve 101 and the first interface C of the four-way valve 101, the exhaust port of the compressor 103 is communicated with the first interface of the indoor heat exchanger 102 through the inlet D of the four-way valve 101 and the second interface E of the four-way valve 101, the air suction port of the compressor 103 is communicated with the first interface of the outdoor heat exchanger 104 through the outlet S of the four-way valve 101 and the first interface C of the four-way valve 101, and the air suction port of the compressor 103 is communicated with the first interface of the indoor heat exchanger 102 through the outlet S of the four-way valve 101 and the second interface E of the four-way valve 101.
The air conditioning system according to the embodiment of the invention may further include:
a temperature sensor 105 for measuring the suction temperature of the compressor 103;
a pressure sensor 106 for measuring the suction pressure of the compressor 103;
the controller 111 is also configured to determine an intake superheat based on the intake temperature measured by the temperature sensor 105 and the intake pressure measured by the pressure sensor 106.
In some embodiments, the controller 111 may also determine the suction superheat according to existing techniques, for example, by determining the suction superheat according to the following equation:
T passing through ＝T Suction pipe －T Saturation of
Wherein T is Passing through Is the degree of superheat, T Suction pipe T is the suction temperature of the compressor Saturation of Is the gasification saturation temperature corresponding to the suction pressure of the compressor.
In some embodiments, T Saturation of The gasification saturation temperature table corresponding to the suction pressure can be searched, and the gasification saturation temperature table can also be calculated through a formula.
As shown in fig. 2, taking air conditioning system operation refrigeration as an example, when the suction superheat calculated by the controller 111 from the suction temperature of the compressor 103 measured by the temperature sensor 105 and the suction pressure of the compressor 103 measured by the pressure sensor 106 is smaller than the superheat threshold, the second solenoid valve 108 may be controlled to be opened and the first solenoid valve 107 may be closed. At this time, a part of the high-temperature and high-pressure gaseous refrigerant of the compressor 103 flows into the outdoor heat exchanger 104 through the four-way valve inlet D and the four-way valve first interface C, and the other part flows through the pipeline connected with the four-way valve second interface E through the second pipeline 110, and is mixed with the low-temperature and low-pressure refrigerant evaporated by the indoor heat exchanger 102, and returns to the air suction port of the compressor 103 through the four-way valve outlet S, thereby improving the air suction superheat degree of the compressor 103, preventing the liquid return phenomenon of the compressor 103, and reducing the burning risk of the compressor 103. When the suction superheat calculated by the controller 111 is greater than the superheat threshold, the first solenoid valve 107 may be controlled to open and the second solenoid valve 108 may be controlled to close. At this time, a part of the high-temperature and high-pressure gaseous refrigerant of the compressor 103 flows into the outdoor heat exchanger 104 through the four-way valve inlet D and the four-way valve first port C, and the other part flows through the outdoor heat exchanger 104 through the first pipe 109 and the pipe connected to the four-way valve first port C, and returns to the outdoor heat exchanger 104 together with the refrigerant flowing out through the four-way valve inlet D and the four-way valve first port C. Because the high-temperature and high-pressure refrigerant entering the outdoor heat exchanger 104 through the first pipeline 109 does not pass through the four-way valve 101, the pressure loss of the refrigerant flowing through the four-way valve 101 is reduced, the inlet side pressure of the outdoor heat exchanger 104 is further improved, the heat exchange efficiency of the outdoor heat exchanger 104 is improved, and the running capacity of an air conditioning system is improved.
In the air conditioning system according to the embodiment of the present invention, the controller 111 is further configured to: when the operation mode of the air conditioning system is a heating mode, the sizes of the air suction superheat degree and the superheat degree threshold are judged, when the air suction superheat degree is smaller than the superheat degree threshold, the first electromagnetic valve 107 is opened, the second electromagnetic valve 108 is closed, and when the air suction superheat degree is larger than or equal to the superheat degree threshold, the first electromagnetic valve 107 is closed, and the second electromagnetic valve 108 is opened.
In the air conditioning system according to the embodiment of the present invention, the controller 111 is further configured to: judging the sizes of the air suction superheat degree and a superheat degree threshold value when the operation mode of the air conditioning system is a refrigeration mode, closing the first electromagnetic valve and opening the second electromagnetic valve when the air suction superheat degree is smaller than the superheat degree threshold value; and when the suction superheat degree is greater than or equal to a superheat degree threshold value, opening the first electromagnetic valve and closing the second electromagnetic valve.
In this case, the superheat threshold value may be set to the same value according to the cooling mode or the heating mode, or may be set to different values, for example, the superheat threshold value in both the cooling mode and the heating mode is 5 ℃, or the superheat threshold value in the cooling mode is 5 ℃, and the superheat threshold value in the heating mode is 2 ℃.
Whether in a cooling mode or a heating mode, as long as the suction superheat degree is smaller than a superheat degree threshold, the refrigerant in the pipeline needs to quickly reach the suction port, so that the speed of improving the suction superheat degree is increased, the suction superheat degree can quickly reach the superheat degree threshold, the phenomenon of liquid impact caused by too low temperature of the suction port of the compressor 103 is prevented, and the operation stability of the compressor 103 is ensured; if the suction superheat degree is greater than the superheat degree threshold, the suction superheat degree of the compressor 103 is not increased, the abrasion of the compressor 103 is reduced, the pressure of the refrigerant inlet side of the indoor heat exchanger 102 can be increased, the heat exchange efficiency of the indoor heat exchanger 102 is improved, and the running capacity of an air conditioning system is improved. In the cooling mode or heating mode, only the opening and closing of the first solenoid valve 107 and the second solenoid valve 108 are different, which is caused by the difference in the conduction direction of the four-way valve 101 when the cooling mode or heating mode is operated.
The air conditioning system of the embodiment of the invention further comprises: a third solenoid valve 112 for controlling the conduction and closure of the third pipe 113; the second end of the third pipe 113 communicates with the first end of the first pipe 109 through the third solenoid valve 112, and the first end of the third pipe 113 communicates with the suction ports of the indoor heat exchanger 104 and the compressor 103, respectively.
After a period of stable operation, if the suction superheat degree of the compressor 103 is still lower than the superheat degree threshold value, the third electromagnetic valve 112 needs to be opened, so that the refrigerant of the outdoor heat exchanger 104 is supplemented to the suction port of the compressor 103, the pressure of the suction port of the compressor 103 is increased, and the suction superheat degree is further better improved; if the superheat degree of the air suction port of the compressor 103 is higher than the superheat degree threshold, the air suction port of the compressor is excessively high, and the first electromagnetic valve 107 needs to be opened, so that the refrigerant at the air discharge port of the compressor 103 can quickly reach the outdoor heat exchanger 104 without passing through the four-way valve 101, the pressure loss passing through the four-way valve 101 is reduced, the heat exchange efficiency of the outdoor heat exchanger 104 is ensured, and the operation capacity of the unit is improved.
Fig. 3 is a flowchart illustrating a control method for an air conditioning system according to an exemplary embodiment, the control method including:
s301, acquiring an operation mode of the air conditioning system.
The operation modes in the invention comprise a heating mode and a refrigerating mode, which can be obtained through the operation state of the air conditioner and the controller.
S302, acquiring the suction superheat degree.
The suction superheat degree can be obtained from a controller, the controller can determine the suction superheat degree according to the suction temperature and the suction pressure of the compressor, the suction superheat degree can be obtained through a calculation formula in the prior art, and the specific calculation of the suction superheat degree can refer to an embodiment of an air conditioning system and is not described herein.
S303, controlling the first electromagnetic valve and the second electromagnetic valve according to the acquired operation mode and the acquired suction superheat degree.
The first electromagnetic valve and the second electromagnetic valve are controlled according to the acquired operation mode and the acquired suction superheat degree, so that when the air conditioner operates in the refrigeration mode and the suction superheat degree is low, the second electromagnetic valve is opened, and the first electromagnetic valve is closed; when the air conditioning system operates in a hot mode and the suction superheat degree is low, the first electromagnetic valve is opened, the second electromagnetic valve is closed, so that the suction superheat degree of the air conditioning system is improved, the liquid return phenomenon of the compressor is prevented, and the burning risk of the compressor is reduced.
As shown in fig. 4, the control method in the air-conditioning heating mode according to the embodiment of the present invention specifically includes:
s401, judging whether the running mode of the air conditioner is heating or not; if yes, the process proceeds to step S402.
The operation mode of the air conditioner may be obtained from the prior art, and will not be described herein.
S402, acquiring the suction superheat degree, judging whether the suction superheat degree meets a preset condition, and if yes, entering a step S403; if not, the process proceeds to step S404.
Acquisition of suction superheat is described in detail with reference to fig. 3. The preset condition is that the suction superheat is smaller than a superheat threshold, and the superheat threshold is set, for example, 5 ℃.
S403, opening the first electromagnetic valve and closing the second electromagnetic valve.
S404, closing the first electromagnetic valve and opening the second electromagnetic valve.
When the air conditioner is in a heating mode, the first electromagnetic valve is opened and the second electromagnetic valve is closed when the suction superheat degree is smaller than the superheat degree threshold value. At this time, a part of the high-temperature and high-pressure gaseous refrigerant of the compressor flows into the indoor heat exchanger through the four-way valve inlet D and the four-way valve second interface E, and the other part of the high-temperature and high-pressure gaseous refrigerant is mixed with the low-temperature and low-pressure refrigerant flowing out of the outdoor heat exchanger after being evaporated through the second pipeline, enters the four-way valve through the first interface C of the four-way valve and returns to the air suction port of the compressor through the outlet S of the four-way valve, so that the air suction superheat degree of the compressor is improved, the liquid return phenomenon of the compressor is prevented, and the burning risk of the compressor is reduced.
And when the suction superheat degree is larger than the superheat degree threshold value, closing the first electromagnetic valve and opening the second electromagnetic valve. At this time, the high-temperature and high-pressure gaseous refrigerant of the compressor flows into the indoor heat exchanger through the inlet D of the four-way valve and the second outlet E of the four-way valve, and the other part of the refrigerant flows into the indoor heat exchanger through the second pipeline, the second electromagnetic valve and the third pipeline together with the refrigerant flowing out through the outlet E of the four-way valve. Because the refrigerant entering the indoor heat exchanger through the third pipeline does not pass through the four-way valve, the pressure loss of the refrigerant flowing through the four-way valve is reduced, the inlet side pressure of the indoor heat exchanger is further improved, the heat exchange efficiency of the indoor heat exchanger is improved, and the running capacity of an air conditioning system is improved.
As shown in fig. 5, the control method of the embodiment of the present invention in the air conditioning refrigeration mode specifically includes:
s501, judging whether the running mode of the air conditioner is refrigeration or not; if yes, the process proceeds to step S502.
S502, acquiring the suction superheat degree, judging whether the suction superheat degree meets a preset condition, and if yes, entering a step S503; if not, the process proceeds to step S504.
S503, closing the first electromagnetic valve and opening the second electromagnetic valve.
S504, opening the first electromagnetic valve and closing the second electromagnetic valve.
In the air-conditioning refrigeration mode, when the suction superheat is smaller than the superheat threshold, the first electromagnetic valve is closed, and the second electromagnetic valve is opened. At this time, a part of the high-temperature and high-pressure gaseous refrigerant of the compressor flows into the outdoor heat exchanger through the four-way valve inlet D and the four-way valve first interface C, and the other part of the refrigerant is mixed with the low-temperature and low-pressure refrigerant evaporated by the indoor heat exchanger through the second pipeline, the mixture flows into the second interface E of the four-way valve and returns to the air suction port of the compressor through the outlet S of the four-way valve, so that the suction superheat degree of the compressor is improved, the liquid return phenomenon of the compressor is prevented, and the burning risk of the compressor is reduced.
And when the suction superheat degree is larger than the superheat degree threshold value, opening the first electromagnetic valve and closing the second electromagnetic valve. At this time, a part of the high-temperature and high-pressure gaseous refrigerant of the compressor flows into the outdoor heat exchanger through the four-way valve inlet D and the four-way valve first interface C, and the other part flows through the outdoor heat exchanger through the second pipeline, the first electromagnetic valve and the first pipeline and then flows back to the outdoor heat exchanger together with the refrigerant flowing out through the four-way valve inlet D and the four-way valve first interface C through the pipeline connected with the four-way valve first interface C. Because the high-temperature and high-pressure refrigerant entering the outdoor heat exchanger through the first pipeline does not pass through the four-way valve, the pressure loss of the refrigerant flowing through the four-way valve is reduced, the inlet side pressure of the outdoor heat exchanger is further improved, the heat exchange efficiency of the outdoor heat exchanger is improved, and the running capacity of an air conditioning system is improved.
As shown in fig. 6, the control method according to the embodiment of the present invention specifically includes:
s601, calculating the operation time when the suction superheat degree meets the preset condition.
S602, judging whether the running time exceeds a time threshold, if so, executing step S603, and if not, returning to step S601.
The operation time meeting the preset condition is the time when the acquired suction superheat is smaller than the superheat threshold, and is calculated from the moment when the suction superheat is smaller than the superheat threshold, for example, the time threshold is 1min, so that the change of the suction superheat in the operation process is conveniently judged, and the suction superheat is accurately controlled according to the suction superheat. The time threshold may be set to the same time according to the cooling mode and the heating mode, or set to different times, for example, the time threshold is 1min in the cooling mode and the heating mode, or the time threshold is 30s in the cooling mode and 1min in the heating mode.
S603, acquiring the suction superheat degree.
S604, judging whether the suction superheat degree is smaller than the superheat degree threshold value, if yes, executing step S605.
S605, the third solenoid valve is opened.
When the air-conditioning system has lower suction superheat degree, the third electromagnetic valve is opened to accelerate the lifting of the suction superheat degree, so that the suction superheat degree reaches the superheat degree threshold value faster, the liquid return phenomenon of the compressor is prevented, and the burning risk of the compressor is reduced.
Taking the operation refrigeration of the air conditioning system as an example, judging the suction superheat degree of the air conditioning system, and opening the second electromagnetic valve and closing the first electromagnetic valve when the acquired suction superheat degree is smaller than a superheat degree threshold value; when the air conditioning system operates, the second electromagnetic valve is opened, the time for closing the first electromagnetic valve reaches the preset time, the suction superheat degree of the air conditioning system is judged again, when the acquired suction superheat degree is smaller than the superheat degree threshold value, the second electromagnetic valve and the third electromagnetic valve are opened, the first electromagnetic valve is closed, at the moment, a part of high-temperature and high-pressure gaseous refrigerant of the compressor directly flows into the outdoor heat exchanger after being mixed with the refrigerant passing through the second pipeline, the second electromagnetic valve and the third electromagnetic valve through the four-way valve inlet D and the four-way valve first interface C, and the other part of refrigerant is mixed with the refrigerant of the indoor heat exchanger at the low temperature and the low pressure at the second interface of the four-way valve through the second pipeline and the second electromagnetic valve, and returns to the suction port of the compressor from the outlet S of the four-way valve, so that the suction superheat degree is accelerated, the suction superheat degree rapidly reaches the superheat degree threshold value, and the liquid return phenomenon of the compressor is prevented. When the suction superheat degree is larger than the superheat degree threshold value, the first electromagnetic valve is opened, the second electromagnetic valve and the third electromagnetic valve are closed, at the moment, one part of the high-temperature and high-pressure gaseous refrigerant of the compressor flows into the outdoor heat exchanger through the four-way valve inlet D and the four-way valve first interface C, and the other part flows through the pipeline connected with the four-way valve first interface C through the second pipeline, the first electromagnetic valve and the first pipeline and returns to the outdoor heat exchanger together with the refrigerant flowing out through the four-way valve inlet D and the four-way valve first interface C. The high-temperature and high-pressure refrigerant entering the outdoor heat exchanger through the first pipeline does not pass through the four-way valve, so that the pressure loss of the refrigerant flowing through the four-way valve is reduced, the inlet side pressure of the outdoor heat exchanger is further improved, the heat exchange efficiency of the outdoor heat exchanger is improved, and the running capacity of an air conditioning system is improved.
It is to be understood that the invention is not limited to the arrangements and instrumentality shown in the drawings and described above, 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 (9)

1. An air conditioning system, the air conditioning system comprising: the air inlet of the compressor is communicated with the first interface of the indoor heat exchanger through the outlet of the four-way valve and the second interface of the four-way valve, and the second interface of the indoor heat exchanger is communicated with the second interface of the outdoor heat exchanger through the electronic expansion valve;
the air conditioning system is characterized by further comprising a bypass control pipeline and a third electromagnetic valve; the bypass control pipeline comprises a first electromagnetic valve, a second electromagnetic valve, a first pipeline, a second pipeline and a third pipeline;
the first end of the first pipeline is communicated with the second end of the second pipeline through the first electromagnetic valve, and the second end of the first pipeline is communicated with the outdoor heat exchanger; the second end of the first pipeline is also communicated with an air suction port of the compressor through the four-way valve;
the first end of the second pipeline is communicated with the exhaust port of the compressor; the second end of the second pipeline is communicated with the second end of the third pipeline through a second electromagnetic valve;
the first end of the third pipeline is communicated with the indoor heat exchanger; the first end of the third pipeline is also communicated with an air suction port of the compressor through the four-way valve;
the second end of the third pipeline is also communicated with the first end of the first pipeline through the third electromagnetic valve;
the first electromagnetic valve is used for controlling the connection and disconnection of the communication relationship between the second end of the second pipeline and the first end of the first pipeline;
the second electromagnetic valve is used for controlling the connection and disconnection of the communication relationship between the second end of the second pipeline and the second end of the third pipeline;
the third electromagnetic valve is used for controlling the connection and disconnection of the communication relationship between the second end of the third pipeline and the first end of the first pipeline;
the controller is electrically connected with the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve and is used for controlling the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve according to the suction superheat degree and the operation mode of the air conditioning system.
2. The air conditioning system of claim 1, further comprising:
a temperature sensor for measuring a suction temperature of the compressor;
a pressure sensor for measuring a suction pressure of the compressor;
the controller is further configured to determine the suction superheat according to the suction temperature measured by the temperature sensor and the suction pressure measured by the pressure sensor.
3. The air conditioning system of claim 1, wherein the controller is further configured to:
when the operation mode of the air conditioning system is a heating mode, the sizes of the air suction superheat degree and the superheat degree threshold are judged, when the air suction superheat degree is smaller than the superheat degree threshold, the first electromagnetic valve is opened, the second electromagnetic valve is closed, and when the air suction superheat degree is larger than or equal to the superheat degree threshold, the first electromagnetic valve is closed, and the second electromagnetic valve is opened.
4. The air conditioning system of claim 1, wherein the controller is further configured to:
judging the sizes of the air suction superheat degree and a superheat degree threshold when the operation mode of the air conditioning system is a refrigeration mode, and closing the first electromagnetic valve and opening the second electromagnetic valve when the air suction superheat degree is smaller than the superheat degree threshold; and when the suction superheat degree is greater than or equal to a superheat degree threshold value, opening the first electromagnetic valve and closing the second electromagnetic valve.
5. The air conditioning system of claim 3 or 4, wherein the controller is further configured to:
calculating the operation time when the suction superheat degree meets the suction superheat degree less than the superheat degree threshold value; acquiring the suction superheat degree when the running time exceeds a time threshold; and when the suction superheat degree is smaller than the superheat degree threshold value, opening the third electromagnetic valve.
6. A control method for the air conditioning system according to any one of claims 1 to 5, characterized by comprising:
acquiring an operation mode of the air conditioning system;
acquiring the suction superheat degree;
and controlling a first electromagnetic valve and a second electromagnetic valve according to the acquired operation mode and the acquired suction superheat degree.
7. The control method according to claim 6, wherein the controlling the first solenoid valve and the second solenoid valve according to the acquired operation mode and the acquired suction superheat specifically includes:
when the acquired operation mode is a heating mode, judging whether the suction superheat degree meets a preset condition, if so, opening a first electromagnetic valve, and closing a second electromagnetic valve; otherwise, closing the first electromagnetic valve and opening the second electromagnetic valve;
the preset condition is that the suction superheat degree is smaller than a superheat degree threshold value.
8. The control method according to claim 6, wherein the controlling the first solenoid valve and the second solenoid valve according to the acquired operation mode and the acquired suction superheat specifically includes:
when the acquired operation mode is a refrigeration mode, judging whether the suction superheat degree meets a preset condition, if so, closing the first electromagnetic valve, and opening the second electromagnetic valve; otherwise, the first electromagnetic valve is opened, and the second electromagnetic valve is closed;
the preset condition is that the suction superheat degree is smaller than a superheat degree threshold value.
9. The control method according to claim 7 or 8, characterized in that the method further comprises:
calculating the operation time when the suction superheat degree meets the preset condition;
judging whether the running time exceeds a time threshold value, and if so, acquiring the suction superheat degree;
and judging whether the suction superheat degree is smaller than a superheat degree threshold value, and if so, opening a third electromagnetic valve.
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CN110160207A (en) * 2019-05-20 2019-08-23 广东美的制冷设备有限公司 The control method of air conditioner and air conditioner
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