CN113237242A - Air conditioning system and control method thereof - Google Patents

Air conditioning system and control method thereof Download PDF

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Publication number
CN113237242A
CN113237242A CN202110583373.6A CN202110583373A CN113237242A CN 113237242 A CN113237242 A CN 113237242A CN 202110583373 A CN202110583373 A CN 202110583373A CN 113237242 A CN113237242 A CN 113237242A
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CN
China
Prior art keywords
air conditioning
conditioning system
heat exchanger
valve unit
time period
Prior art date
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Granted
Application number
CN202110583373.6A
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Chinese (zh)
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CN113237242B (en
Inventor
周威
潘李奎
胡金泉
郑富伟
张志斌
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Shenzhen Mcquay Air Conditioning Co Ltd
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Shenzhen Mcquay Air Conditioning Co Ltd
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Priority to CN202110583373.6A priority Critical patent/CN113237242B/en
Publication of CN113237242A publication Critical patent/CN113237242A/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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The application provides an air conditioning system and a control method thereof, the air conditioning system includes: the compressor, first heat exchanger, second heat exchanger, high pressure side pressure container and low pressure side component, the compressor, first heat exchanger with the second heat exchanger respectively with the 1 st mouth, the 2 nd mouth and the 4 th mouth of four-way valve are connected, low pressure side component is connected the induction port of compressor with between the 3 rd mouth of four-way valve, high pressure side pressure container is connected between first heat exchanger and the second heat exchanger, high pressure side pressure container include the container body with set up in the bypass pipe of container body, the bypass pipe is connected low pressure side component makes the container body with low pressure side component intercommunication.

Description

Air conditioning system and control method thereof
Technical Field
The present disclosure relates to the field of control technologies, and in particular, to an air conditioning system and a control method thereof.
Background
In the heating process of the air conditioning system, the outdoor heat exchanger can generate a frosting phenomenon, and the air conditioning unit needs to be subjected to defrosting treatment.
The defrost process generally includes two modes: stop defrosting and non-stop defrosting. The shutdown defrosting is to convert heating into cooling by converting the flow direction of the refrigerant, so that the high-temperature and high-pressure refrigerant output by the compressor is conveyed to the outdoor heat exchanger, and a frost layer on the outdoor heat exchanger is melted. In the non-stop defrosting, part of high-temperature and high-pressure refrigerant output from the compressor is guided to the outdoor heat exchanger, so that the temperature of the outdoor heat exchanger is continuously increased, and therefore, a frost layer on the outdoor heat exchanger is also melted.
It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.
Disclosure of Invention
The inventors of the present application found that: in current air conditioning system, when the phenomenon of frosting takes place, need carry out frequent defrosting and handle to influence indoor heating, reduce indoor user's thermal comfort, and, the phenomenon of frosting easily causes the refrigerant incomplete evaporation in the evaporimeter, arouses the compressor to inhale the area liquid, and then has aggravated the wearing and tearing of compressor, reduces air conditioning system's life. Further, the inventors of the present application have also found that: in the refrigeration process, a compressor of the air-conditioning system is in a partial load operation state in most of time, so that frequent loading and unloading of the air-conditioning system are easily caused, temperature fluctuation is caused, and the customer experience is reduced; in addition, for the water chilling unit, in the process of refrigeration, if the water temperature is too low, the danger of freezing is easy to occur.
In order to solve the above problems or the like, embodiments of the present invention provide an air conditioning system and a control method thereof, in which a bypass pipe of a high-pressure side pressure tank is provided to communicate a high-pressure side element and a low-pressure side element of the air conditioning system, thereby achieving the following effects: for the heating operation of the air-conditioning system, on the premise of not losing the heating quantity, the pressure in the evaporator can be improved, the defrosting period of the air-conditioning system is prolonged, the defrosting frequency is reduced, the thermal comfort of indoor users is improved, and a high-pressure refrigerant and a low-pressure refrigerant can be mixed, so that the superheat degree of the refrigerant entering a compressor is improved, and the abrasion caused by liquid impact of the compressor is avoided; for the refrigeration operation of the air conditioning system, part of the refrigerant can directly enter the compressor without passing through the evaporator, so that the refrigeration capacity can be reduced, particularly, the frequent load and unload of the compressor can be avoided during the partial load operation, the temperature fluctuation can be reduced, in addition, the evaporation pressure can be improved, and the anti-freezing effect can be achieved.
According to a first aspect of embodiments of the present application, there is provided an air conditioning system including: an air conditioning system, comprising: a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a high-side pressure vessel and a low-side element,
the compressor, the first heat exchanger and the second heat exchanger are respectively connected with a 1 st port, a 2 nd port and a 4 th port of the four-way valve,
the low pressure side element is connected between a suction port of the compressor and a 3 rd port of the four-way valve,
the high side pressure vessel is connected between the first heat exchanger and the second heat exchanger,
the high-pressure side pressure container comprises a container body and a bypass pipe arranged on the container body,
the bypass pipe connects the low pressure side element to communicate the tank body with the low pressure side element.
According to a second aspect of embodiments of the present application, there is provided a control method of an air conditioning system including: a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a high-pressure side pressure vessel, a low-pressure side element, and a valve unit,
the compressor, the first heat exchanger and the second heat exchanger are respectively connected with a 1 st port, a 2 nd port and a 4 th port of the four-way valve,
the low pressure side element is connected between a suction port of the compressor and a 3 rd port of the four-way valve,
the high side pressure vessel is connected between the first heat exchanger and the second heat exchanger,
the high-pressure side pressure container comprises a container body and a bypass pipe arranged on the container body,
the bypass pipe is connected to the low pressure side element to communicate the tank body with the low pressure side element,
the valve unit is provided on a pipe connecting the bypass pipe and the low pressure side element,
the control method comprises the following steps:
and controlling the opening and closing of the valve unit according to at least one of a low pressure value of the air conditioning system, a superheat degree of the air conditioning system and a system temperature of the air conditioning system.
The beneficial effects of the embodiment of the application are that: on the premise of not losing the heating capacity, the defrosting frequency is reduced, the abrasion caused by the liquid impact of the compressor is avoided, the temperature fluctuation caused by the frequent loading and unloading of the compressor is avoided, the evaporation pressure is improved, and the anti-freezing effect is achieved.
Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the present application include many variations, modifications, and equivalents within the scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
Elements and features described in one drawing or one implementation of an embodiment of the application may be combined with elements and features shown in one or more other drawings or implementations. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts for use in more than one embodiment.
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic view of an air conditioning system of embodiment 1 of the present application;
fig. 2 is a schematic diagram of a first specific embodiment of an air conditioning system of embodiment 1 of the present application;
fig. 3 is a schematic diagram of a second specific embodiment of an air conditioning system of embodiment 1 of the present application;
fig. 4 is a schematic diagram of a third specific embodiment of an air conditioning system of embodiment 1 of the present application;
fig. 5 is a schematic diagram of a fourth specific embodiment of an air conditioning system of embodiment 1 of the present application;
fig. 6 is a schematic view of a first modification of the air conditioning system of embodiment 1 of the present application;
fig. 7 is a schematic view of a second modification of the air conditioning system of embodiment 1 of the present application;
fig. 8 is a schematic view of a third modification of the air conditioning system of embodiment 1 of the present application;
fig. 9 is a schematic view of a fourth modification of the air conditioning system of embodiment 1 of the present application;
fig. 10 is a schematic view of a fifth modification of the air conditioning system of embodiment 1 of the present application;
fig. 11 is a schematic view of a sixth modification of the air conditioning system of embodiment 1 of the present application;
fig. 12 is a schematic view of a seventh modification of the air conditioning system of embodiment 1 of the present application;
fig. 13 is a schematic view of an eighth modification of the air conditioning system of embodiment 1 of the present application;
fig. 14 is a schematic diagram of a control method of embodiment 2.
Detailed Description
The foregoing and other features of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the application are disclosed in detail as being indicative of some of the embodiments in which the principles of the application may be employed, it being understood that the application is not limited to the embodiments described, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims. Various embodiments of the present application will be described below with reference to the drawings. These embodiments are merely exemplary and are not intended to limit the present application.
In the embodiments of the present application, the terms "first", "second", and the like are used for distinguishing different elements by reference, but do not denote a spatial arrangement, a temporal order, or the like of the elements, and the elements should not be limited by the terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," and the like, refer to the presence of stated features, elements, components, and do not preclude the presence or addition of one or more other features, elements, components, and elements. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the embodiments of the present application, the singular forms "a", "an", and the like include the plural forms and are to be construed broadly as "a" or "an" and not limited to the meaning of "a" or "an"; furthermore, the term "the" should be understood to include both the singular and the plural, unless the context clearly dictates otherwise. Further, the term "according to" should be understood as "at least partially according to … …," and the term "based on" should be understood as "based at least partially on … …," unless the context clearly dictates otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other; in addition, "connection" between elements or nodes on a pipeline guiding a flow of a fluid (for example, a refrigerant in an air conditioning system) may be understood as "connection by a refrigerant pipeline, the connected elements or nodes are communicated with each other through the refrigerant pipeline, and the refrigerant can flow through the refrigerant pipeline". The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
In the description of the present application, the 1 st port of the four-way valve may be the D port, the 2 nd port of the four-way valve may be the C port, the 3 rd port of the four-way valve may be the S port, and the 4 th port of the four-way valve may be the E port. For the description of the ports D, C, E and S of the four-way valve, reference may be made to the related art. The four-way valve can have two communication modes, and under different communication modes, the four ports of the four-way valve have different communication modes, for example: in the first communication mode, the 1 st port (i.e., the D port) and the 4 th port (i.e., the E port) of the four-way valve are communicated, and the 2 nd port (i.e., the C port) and the 3 rd port (i.e., the S port) are communicated; in the second communication mode, port 1 (i.e., port D) and port 2 (i.e., port C) of the four-way valve communicate with each other, and port 3 (i.e., port S) and port 4 (i.e., port E) communicate with each other.
Example 1
Embodiment 1 of the present application provides an air conditioning system.
Fig. 1 is a schematic view of an air conditioning system according to embodiment 1 of the present application. As shown in fig. 1, the air conditioning system 100 includes: a compressor 10, a four-way valve 20, a first heat exchanger 30, a second heat exchanger 40, a high-side pressure vessel 50, and a low-side element 60.
As shown in fig. 1, the compressor 10, the first heat exchanger 30, and the second heat exchanger 40 are connected to a port 1 (e.g., port D), a port 2 (e.g., port C), and a port 4 (e.g., port E) of the four-way valve 20, respectively. For example, the outlet 11 of the compressor 10 is connected to the 1 st port of the four-way valve 20, the 2 nd port of the four-way valve 20 is connected to the one refrigerant conveying port 31 of the first heat exchanger 30, and the 4 th port of the four-way valve 20 is connected to the one refrigerant conveying port 41 of the second heat exchanger 40.
In the present embodiment, the first heat exchanger 30 may be, for example, an outdoor unit, and the second heat exchanger 40 may be, for example, an indoor unit. The second heat exchanger 40 may have a water inlet 401 and a water outlet 402, whereby the refrigerant introduced into the second heat exchanger 40 may exchange heat with water introduced into the second heat exchanger 40 in the second heat exchanger 40. The second heat exchanger 40 may be provided with a fan instead of the water inlet 401 and the water outlet 402, and the flowing gas exchanges heat with the refrigerant entering the second heat exchanger 40 when the fan is operated. The system temperature of the air conditioning system 100 may refer to the outlet water temperature or the outlet air temperature of the second heat exchanger 40.
As shown in fig. 1, the low-pressure side element 60 is connected between the suction port 12 of the compressor 10 and the 3 rd port (e.g., S port) of the four-way valve 20. The low pressure side element 60 may include, for example, a low pressure vessel 61, a first low pressure line 62, and a second low pressure line 63. The first low pressure line 62 may connect the 3 rd port of the four-way valve 20 to the low pressure vessel 61, and the second low pressure line 63 may connect the low pressure vessel 61 to the suction port 12 of the compressor 10. The low pressure vessel 61 may be, for example, a gas-liquid separator, and the gaseous refrigerant in the low pressure vessel 61 may be delivered from the second low pressure pipe 63 to the suction port 12 of the compressor 10.
The high-pressure side pressure vessel 50 is connected between the first heat exchanger 30 and the second heat exchanger 40, and for example, the high-pressure side pressure vessel 50 is connected between the other refrigerant delivery port 32 of the first heat exchanger 30 and the other refrigerant delivery port 42 of the second heat exchanger 40.
In this embodiment, the high side pressure vessel 50 may include: a container body 51 and a bypass pipe 52 provided to the container body 51. In which the bypass pipe 52 is connected to the low pressure side element 60 such that the inside of the vessel body 51 communicates with the low pressure side element 60, for example, in fig. 1, the bypass pipe 52 is connected to a first low pressure line 62. Further, the present embodiment may not be limited to this, and for example, the bypass pipe 52 may be connected to the low pressure tank 61, or the bypass pipe 52 may be connected to the second low pressure line 63.
As shown in fig. 1, an opening of the bypass pipe 52 may be provided at an upper portion of the inner space of the container body 51, whereby the bypass pipe 52 can output the refrigerant in a gaseous state from the container body 51.
Since the low-pressure side element 60 is connected to the suction port 12 of the compressor 10, the refrigerant pressure in the low-pressure side element 60 is low. The high-pressure side pressure vessel 50 has a high refrigerant pressure. The bypass pipe 52 communicates the interior of the tank main body 51 of the high-pressure-side pressure tank 50 with the low-pressure-side element 60, and allows the high-pressure refrigerant in the tank main body 51 to enter the low-pressure-side element 60 and to be mixed with the refrigerant in the low-pressure-side element 60.
Therefore, when the air conditioning system is in a heating operation mode, the defrosting frequency can be reduced on the premise of not losing the heating quantity, and the abrasion caused by the liquid impact of the compressor is avoided; in addition, when the air conditioning system is in a cooling operation mode, temperature fluctuation caused by frequent loading and unloading of the compressor can be avoided, the evaporation pressure is increased, and an anti-freezing effect is achieved.
As shown in fig. 1, in the present embodiment, the high-side pressure tank 50 may further include a first delivery pipe 53 and a second delivery pipe 54. The first and second delivery pipes 53 and 54 are connected to the first and second heat exchangers 30 and 40, respectively. For example, the first delivery pipe 53 is connected to the other refrigerant delivery port 32 of the first heat exchanger 30, and delivers the refrigerant in the container body 51 to the first heat exchanger 30, or delivers the refrigerant output from the first heat exchanger 30 to the container body 51; the second delivery pipe 54 is connected to the other refrigerant delivery port 42 of the second heat exchanger 40, and delivers the refrigerant in the container body 51 to the second heat exchanger 40, or delivers the refrigerant output from the second heat exchanger 40 to the container body 51. In this embodiment, the openings of the first delivery pipe 53 and the second delivery pipe 54 may be located at a lower portion of the inner space of the container body 51, so that the first delivery pipe 53 and the second delivery pipe 54 can output the liquid refrigerant from the container body 51.
As shown in fig. 1, in the present embodiment, the air conditioning system 100 may further include: and a first throttling element 70 provided on a connection line connecting the first transfer pipe 53 and the first heat exchanger 30. The first throttling element 70 may throttle the refrigerant flowing through the first throttling element 70. For example, the first throttling element 70 may be an expansion valve (EXV).
As shown in fig. 1, the air conditioning system 100 further includes: a valve unit 80. The valve unit 80 is provided on a line connecting the bypass pipe 52 and the low pressure side member 60. The opening and closing of the valve unit 80 can control the on/off of the pipeline and/or the flow rate of the refrigerant in the pipeline, for example: when the valve unit 80 is opened, the refrigerant can flow from the bypass pipe 52 to the low-pressure side element 60; the valve unit 80 is closed, and the refrigerant cannot flow from the bypass pipe 52 to the low-pressure side element 60.
In the present embodiment, the valve unit 80 may include a valve, which may be, for example, a solenoid valve, an electronic expansion valve, a thermostatic expansion valve, an electric ball valve, or the like. In addition, the valve unit 80 may further include a capillary tube, and the capillary tube may be connected in series with the valve. For example, in one embodiment, valve unit 80 includes a solenoid valve and a capillary tube connected in series.
As shown in fig. 1, in the present embodiment, the air conditioning system 100 may further include: a controller 90. The controller 90 can control the opening and closing of the valve unit 80 according to at least one of a low pressure value of the air conditioning system 100, a superheat degree of the air conditioning system 100, and a system temperature of the air conditioning system 100. The low pressure value of the air conditioning system 100 may refer to a pressure value of the refrigerant in the first low pressure pipeline 62 in fig. 1; the superheat degree of the air conditioning system 100 may refer to a superheat degree of the refrigerant in the first low-pressure pipeline 62 in fig. 1, and can be calculated according to a pressure value and a temperature of the refrigerant in the first low-pressure pipeline 62; the system temperature of the air conditioning system 100 may refer to the outlet water temperature or the outlet air temperature of the second heat exchanger 40.
Hereinafter, the operation principle of the air conditioning system 100 when the air conditioning system 100 is in the heating operation mode or the cooling operation mode will be described by way of example.
In one example, the air conditioning system 100 is in a heating mode of operation.
When the air conditioning system 100 is in the heating operation mode, the 1 st port (i.e., the D port) and the 4 th port (i.e., the E port) of the four-way valve 20 are communicated, and the 2 nd port (i.e., the C port) and the 3 rd port (i.e., the S port) are communicated. The refrigerant outputted from the output port 11 of the compressor 10 passes through the 1 st port and the 4 th port of the four-way valve 20, enters one refrigerant delivery port 41 of the second heat exchanger 40, and is condensed and heat-exchanged in the second heat exchanger 40 (in this case, the second heat exchanger 40 serves as a condenser). The refrigerant then enters the high-side pressure vessel 50 from the other refrigerant delivery port 42 of the second heat exchanger 40. The refrigerant in the high-pressure side pressure vessel 50 passes through the expansion valve 70, enters the first heat exchanger 30 through the other refrigerant conveying port 32 of the first heat exchanger 30 (in this case, the first heat exchanger 30 serves as an evaporator), and exchanges heat by evaporation. Subsequently, the refrigerant is outputted from the first heat exchanger 30 through one refrigerant delivery port 31 of the first heat exchanger 30, and is introduced into the low pressure side element 60 through the 2 nd port and the 3 rd port of the four-way valve 20. Then, the refrigerant enters the suction port 12 of the compressor 10.
In one embodiment of this example, when the air conditioning system 100 is in the heating mode of operation, the controller 90 controls the valve unit 80 to open when the low pressure value of the air conditioning system 100 is less than the first threshold value X1 for a duration greater than a predetermined first time period. Thus, a part of the high-pressure refrigerant gas in the high-pressure side pressure tank 50 may enter the low-pressure side element 60 through the bypass pipe 52, thereby reducing the amount of refrigerant that enters the first heat exchanger 30 (in this case, the first heat exchanger 30 serves as an evaporator), increasing the refrigerant pressure in the first heat exchanger 30, extending the cycle of performing the defrosting process, reducing the frequency of performing the defrosting process, and improving the thermal comfort of the user.
Further, in this embodiment, when the air conditioning system 100 is in the heating operation mode, in a state where the valve 80 is open, when the duration of the time period in which the low pressure value of the air conditioning system 100 is greater than the third threshold value X2 is greater than the predetermined third time period, the controller 90 controls such that the valve unit 80 is closed.
In this embodiment, the first threshold value X1 and the second threshold value X2 may be set according to the dew point temperature of the surroundings of the first heat exchanger 30. For example, if the ambient dew point temperature of the first heat exchanger 30 increases, the first threshold X1 and the second threshold X2 may increase.
In another embodiment of this example, when the air conditioning system 100 is in the heating operation mode, the controller 90 controls the valve unit 80 to open when the duration of the time period in which the degree of superheat of the air conditioning system 100 is less than the second threshold Y1 is greater than the predetermined second time period. Therefore, part of the high-pressure refrigerant gas in the high-pressure side pressure container 50 can enter the low-pressure side element 60 through the bypass pipe 52, so that the high-pressure refrigerant is mixed with the low-pressure refrigerant in the low-pressure side element 60, the mixed refrigerant enters the compressor 10, the superheat degree of the refrigerant entering the compressor 10 is improved, and the compressor 10 is prevented from being abraded due to liquid impact caused by suction.
Further, in this embodiment, when the air conditioning system 100 is in the heating operation mode, in a state where the valve 80 is open, when the duration of the time period in which the degree of superheat of the air conditioning system 100 is greater than the fourth threshold value Y2 is greater than the predetermined fourth time period, the controller 90 controls to close the valve unit 80.
In this example, the controller 90 of the air conditioning system 100 may control the opening or closing of the valve unit 80 according to the comparison result of the low pressure value with the first threshold value and the third threshold value, or the controller 90 of the air conditioning system 100 may control the opening or closing of the valve unit 80 according to the comparison result of the superheat degree with the second threshold value and the fourth threshold value, when the air conditioning process heating operation mode is performed.
In addition, the controller 90 may also control the opening or closing of the valve unit 80 according to both the low pressure value and the degree of superheat when in the air-conditioning heating operation mode. For example, in a state where the valve unit 80 is closed, the duration in which the low pressure value is less than the first threshold value X1 is greater than a predetermined first period and the duration in which the degree of superheat is less than the second threshold value Y1 is greater than a predetermined second period, and when either of these two conditions is satisfied, the valve unit 80 is opened; and, in the state where the valve unit 80 is opened, when the duration of the low pressure value greater than the third threshold value X2 is greater than the predetermined third period and the duration of the superheat degree greater than the fourth threshold value Y2 is greater than the predetermined fourth period, both of which are satisfied, the valve unit 80 is closed.
In another example, the air conditioning system 100 is in a cooling mode of operation.
When the air conditioning system 100 is in the cooling operation mode, the 1 st port (i.e., the D port) and the 2 nd port (i.e., the C port) of the four-way valve 20 are communicated, and the 3 rd port (i.e., the S port) and the 4 th port (i.e., the E port) are communicated. The refrigerant output from the output port 11 of the compressor 10 passes through the 1 st port and the 2 nd port of the four-way valve 20, enters one refrigerant delivery port 31 of the first heat exchanger 30, and is condensed and heat-exchanged in the first heat exchanger 30 (in this case, the first heat exchanger 30 serves as a condenser). The refrigerant then enters the high-side pressure vessel 50 from the refrigerant delivery port 32 of the first heat exchanger 30, and is throttled by the expansion valve 70. The refrigerant in the high-pressure side pressure vessel 50 enters the second heat exchanger 40 through the other refrigerant delivery port 42 of the second heat exchanger 40 (in this case, the second heat exchanger 40 functions as an evaporator), and performs evaporation heat exchange. Subsequently, the refrigerant is outputted from the second heat exchanger 40 through one refrigerant delivery port 41 of the second heat exchanger 40, and is introduced into the low pressure side element 60 through the 4 th port and the 3 rd port of the four-way valve 20. Then, the refrigerant enters the suction port 12 of the compressor 10.
In one embodiment of this example, when the air conditioning system 100 is in the cooling operation mode, the controller 90 controls the valve unit 80 to open when the duration for which the variation value of the system temperature of the air conditioning system 100 is greater than the fifth threshold value Z1 is greater than the predetermined fifth time period. Thus, a part of the high-pressure refrigerant gas in the high-pressure side pressure vessel 50 may enter the low-pressure side element 60 through the bypass pipe 52 and enter the compressor 10, thereby reducing the amount of refrigerant entering the second heat exchanger 40 (in this case, the second heat exchanger 40 serves as an evaporator), thereby reducing the cooling capacity of the second heat exchanger 40, and avoiding frequent load shedding of the compressor 10 and reducing temperature fluctuations during partial load operation. And the change value of the system temperature is equal to the difference value obtained by subtracting the target temperature value from the actual value of the system temperature.
Further, in this embodiment, when the air conditioning system 100 is in the cooling operation mode, the controller 90 controls the valve unit 80 to be closed if the duration of the system temperature variation value less than the seventh threshold value Z2 is greater than a predetermined seventh time period while the valve unit 80 is in the open state.
In another embodiment of this example, when the air conditioning system 100 is in the cooling operation mode, the controller 90 controls the valve unit 80 to open when the system temperature of the air conditioning system 100 is less than the sixth threshold M1 for a duration greater than a predetermined sixth time period. Accordingly, a part of the high-pressure refrigerant gas in the high-pressure side pressure tank 50 may enter the low-pressure side element 60 through the bypass pipe 52 and enter the compressor 10, thereby reducing the amount of the refrigerant entering the second heat exchanger 40 (in this case, the second heat exchanger 40 serves as an evaporator), thereby increasing the evaporation pressure in the second heat exchanger 40, and preventing the freezing phenomenon caused by the excessively low temperature of the cold water, particularly, when the cold water is prepared by using the second heat exchanger 40.
Further, in this embodiment, when the air conditioning system 100 is in the cooling operation mode, the controller 90 controls the valve unit 80 to be closed when the duration of the system temperature greater than the eighth threshold value M2 is greater than a predetermined eighth time period in a state in which the valve unit 80 is open.
In this instance, the controller 90 of the air conditioning system 100 may control the opening or closing of the valve unit 80 according to the variation value of the system temperature and the comparison result of the system temperature with the fifth threshold value and the seventh threshold value, or the controller 90 of the air conditioning system 100 may control the opening or closing of the valve unit 80 according to the comparison result of the system temperature with the sixth threshold value and the eighth threshold value, when the air conditioning process cooling operation mode is performed.
In addition, the controller 90 may also control the opening or closing of the valve unit 80 according to both the variation value of the system temperature and the system temperature in the air conditioning process cooling operation mode. For example, in a state where the valve unit 80 is closed, the change value of the system temperature and the duration of time greater than the fifth threshold value Z1 are greater than the predetermined fifth time period and the duration of time in which the system temperature is less than the sixth threshold value M1 are greater than the predetermined sixth time period, and when either of the two conditions is satisfied, the valve unit 80 is opened; and, in a state where the valve unit 80 is opened, when a duration of a change value of the system temperature being less than the seventh threshold value Z2 is greater than a predetermined seventh period and a duration of the system temperature being greater than the eighth threshold value M2 is greater than a predetermined eighth period, both of which are satisfied, the valve unit 80 is closed.
In the above description of embodiment 1, as an example:
the first threshold may be a change value of the saturation pressure corresponding to the dew point temperature, for example, k1*PTd-A, wherein PTdSaturation pressure, k, corresponding to dew point temperature1Is an empirical coefficient, e.g. k11.1, a is a correction value, for example, 3;
the second threshold may be a change value of the target degree of superheat, for example, the second threshold ═ Δ Tsh-B, wherein Δ TshB is a correction value, such as B ═ 2 and the like, for the target degree of superheat of the intake air;
the third threshold may be determined according to a variation of the first threshold, for example, the third threshold is the first threshold + C, where C is a correction value, such as 0.5;
the fourth threshold may be determined according to a variation of the second threshold, for example, the fourth threshold is the second threshold + D, where D is a correction value, such as D2; the fifth threshold value may be such that,
the fifth threshold may be determined according to a variation of the seventh threshold, for example, the fifth threshold k2A seventh threshold value, wherein k2Is an empirical value, e.g. k23, etc.;
the sixth threshold may be a value calculated from a change value of the target outlet water temperature, for example, the sixth threshold k3*To-E, wherein ToIs a target outlet water temperature, k3Is an empirical coefficient, e.g. k3E is a correction value, E is 1.1, etc., E is 5, etc.;
the seventh threshold may be a temperature precision value controlled by a user, and may be set, for example, through a setting interface of a control panel of the air conditioning system, where the setting range of the seventh threshold is, for example, 0.1 to 2 ℃;
the eighth threshold may be determined according to a variation of the sixth threshold, for example, the eighth threshold is the sixth threshold + F, where F is an empirical value, such as F3;
the first time period may be 3-8 minutes, such as 5 minutes;
the second period of time may be 3 to 8 minutes, such as 5 minutes, etc.;
the third period of time may be 2 to 5 minutes, such as 3 minutes, etc.;
the fourth time period may be 2-5 minutes, such as 3 minutes;
the fifth time period may be 5 to 15 minutes, such as 10 minutes, etc.;
the sixth time period may be 2 to 5 minutes, for example 3 minutes or the like;
the seventh time period may be 5 to 15 minutes, for example 10 minutes or the like;
the eighth time period may be 3 to 8 minutes, for example, 5 minutes.
The respective thresholds and time periods are exemplified above. The present application may not be limited to this, and each threshold value and the time period may have other values.
According to the above descriptions of the air conditioning system 100 in the heating operation mode and the cooling operation mode, the air conditioning system of the present application can achieve the following effects: for the heating operation of the air-conditioning system, on the premise of not losing the heating quantity, the pressure in the evaporator can be improved, the defrosting period of the air-conditioning system is prolonged, the defrosting frequency is reduced, the thermal comfort of indoor users is improved, and a high-pressure refrigerant and a low-pressure refrigerant can be mixed, so that the superheat degree of the refrigerant entering a compressor is improved, and the abrasion caused by liquid impact of the compressor is avoided; in addition, for the refrigeration operation of the air conditioning system, part of refrigerant can directly enter the compressor without passing through the evaporator, so that the refrigeration capacity can be reduced, particularly, the frequent load and load shedding of the compressor can be avoided during the partial load operation, the temperature fluctuation is reduced, in addition, the evaporation pressure can be improved, and the anti-freezing effect is achieved.
Fig. 2 is a schematic diagram of a first specific embodiment of an air conditioning system 100 of embodiment 1 of the present application. As shown in fig. 2, the valve unit 80 of the air conditioning system 100 includes a solenoid valve 801 and a capillary tube 810.
Fig. 3 is a schematic diagram of a second specific embodiment of the air conditioning system 100 of embodiment 1 of the present application. As shown in fig. 3, the valve unit 80 of the air conditioning system 100 includes a solenoid valve 801. Wherein the valve unit 80 does not include a capillary tube.
Fig. 4 is a schematic diagram of a third specific embodiment of an air conditioning system 100 of embodiment 1 of the present application. As shown in fig. 4, the valve unit 80 of the air conditioning system 100 includes an expansion valve 802. Wherein the valve unit 80 does not include a capillary tube.
Fig. 5 is a schematic diagram of a fourth specific embodiment of an air conditioning system 100 of embodiment 1 of the present application. As shown in fig. 5, the valve unit 80 of the air conditioning system 100 includes an electric ball valve 803. Wherein the valve unit 80 does not include a capillary tube.
Fig. 6 is a schematic diagram of a first modification of the air conditioning system 100 according to embodiment 1 of the present application. As shown in fig. 6, the valve unit 80 of the air conditioning system 100a includes a solenoid valve 801 and a capillary tube 810. Fig. 6 differs from fig. 1 in that, in the first modification of fig. 6, the bypass pipe 52 is connected to the second low-pressure line 63 of the low-pressure-side element 60.
Fig. 7 is a schematic diagram of a second modification of the air conditioning system 100 according to embodiment 1 of the present application. As shown in fig. 7, the valve unit 80 of the air conditioning system 100b includes a solenoid valve 801. Fig. 7 differs from fig. 1 in that, in the second modification of fig. 7, the bypass pipe 52 is connected to the second low-pressure line 63 of the low-pressure-side element 60.
Fig. 8 is a schematic diagram of a third modification of the air conditioning system 100 according to embodiment 1 of the present application. As shown in fig. 8, the valve unit 80 of the air conditioning system 100c includes an expansion valve 802. Fig. 8 differs from fig. 1 in that, in the third modification of fig. 8, the bypass pipe 52 is connected to the second low-pressure line 63 of the low-pressure-side element 60.
Fig. 9 is a schematic diagram of a fourth modification of the air conditioning system 100 according to embodiment 1 of the present application. As shown in fig. 9, the valve unit 80 of the air conditioning system 100d includes an electric ball valve 803. Fig. 9 differs from fig. 1 in that, in the third modification of fig. 9, the bypass pipe 52 is connected to the second low-pressure line 63 of the low-pressure-side element 60.
Fig. 10 is a schematic diagram of a fifth modification of the air conditioning system 100 according to embodiment 1 of the present application. As shown in fig. 10, the valve unit 80 of the air conditioning system 100e includes a solenoid valve 801 and a capillary tube 810. Fig. 10 differs from fig. 1 in that in the fifth modification of fig. 10, the bypass pipe 52 is connected to the low-pressure side pressure tank 61 of the low-pressure side element 60.
Fig. 11 is a schematic diagram of a sixth modification of the air conditioning system 100 according to embodiment 1 of the present application. As shown in fig. 11, the valve unit 80 of the air conditioning system 100f includes a solenoid valve 801. Fig. 11 differs from fig. 1 in that in the sixth modification of fig. 11, the bypass pipe 52 is connected to the low-pressure side pressure tank 61 of the low-pressure side element 60.
Fig. 12 is a schematic diagram of a seventh modification of the air conditioning system 100 according to embodiment 1 of the present application. As shown in fig. 12, the valve unit 80 of the air conditioning system 100g includes an expansion valve 802. Fig. 12 differs from fig. 1 in that in the seventh modification of fig. 12, the bypass pipe 52 is connected to the low-pressure side pressure tank 61 of the low-pressure side element 60.
Fig. 13 is a schematic diagram of an eighth modification of the air conditioning system 100 according to embodiment 1 of the present application. As shown in fig. 13, the valve unit 80 of the air conditioning system 100h includes an electric ball valve 803. Fig. 13 differs from fig. 1 in that in the eighth modification of fig. 13, the bypass pipe 52 is connected to the low-pressure side pressure tank 61 of the low-pressure side element 60.
In fig. 2 to 13, the controller 90 is not shown.
Example 2
Embodiment 2 of the present application provides a control method of an air conditioning system. This control method is used to control any one of the air conditioning systems 100 and 100a to 100h described in embodiment 1.
Fig. 14 is a schematic diagram of a control method of embodiment 2. As shown in fig. 14, the control method includes:
operation 1401, controlling opening and closing of a valve unit of an air conditioning system according to at least one of a low pressure value of the air conditioning system, a superheat degree of the air conditioning system, and a system temperature of the air conditioning system.
Such as valve unit 80 of air conditioning system 100 of fig. 1.
In one embodiment, operation 1401 may comprise, while the air conditioning system is in a heating mode of operation: when the duration time of the low pressure value smaller than a first threshold value is larger than a preset first time period, controlling the valve unit to be opened; alternatively, the valve unit is controlled to be opened when the duration of the degree of superheat being less than a second threshold is greater than a predetermined second time period.
In another embodiment, operation 1401 may comprise, while the air conditioning system is in a heating mode of operation: when the duration time period that the low pressure value is greater than the third threshold value is greater than a preset third time period, controlling the valve unit to be closed; alternatively, the valve unit is controlled to close when the duration of the degree of superheat being greater than a fourth threshold is greater than a predetermined fourth time period.
In yet another embodiment, operation 1401 may comprise, while the air conditioning system is in a cooling mode of operation: when the duration time of the change value of the system temperature greater than the fifth threshold value is greater than a preset fifth time period, controlling the valve unit to be opened; or, when the duration time period that the system temperature is less than the sixth threshold value is greater than a predetermined sixth time period, controlling the valve unit to open.
In yet another embodiment, operation 1401 may comprise, while the air conditioning system is in a cooling mode of operation: when the duration time period that the change value of the system temperature is smaller than the seventh threshold value is larger than a preset seventh time period, controlling the valve unit to be closed; or, when the duration of the system temperature being greater than the eighth threshold value is greater than a predetermined eighth time period, controlling the valve unit to close.
According to the embodiment, when the air conditioning system is in the heating operation mode, the defrosting frequency can be reduced on the premise of not losing the heating quantity, and the abrasion caused by the liquid impact of the compressor is avoided; in addition, when the air conditioning system is in a cooling operation mode, temperature fluctuation caused by frequent loading and unloading of the compressor can be avoided, the evaporation pressure is increased, and an anti-freezing effect is achieved.
In embodiment 1 and the modifications of the present application, the controller may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to a computer-readable program which, when executed by a logic section, enables the logic section to realize the above-described apparatus or constituent section, or to realize the above-described various methods or steps. The present invention also relates to a storage medium such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like, for storing the above program.
The processing methods in the controller described in connection with the embodiments of the invention may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. For example, one or more controllers and/or one or more combinations of functional blocks may correspond to individual software modules of a computer program flow or may correspond to individual hardware modules. These software modules may correspond to the respective steps. These hardware modules may be implemented, for example, by solidifying these software modules using a Field Programmable Gate Array (FPGA).
A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium; or the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The software module may be stored in the memory of the mobile terminal or in a memory card that is insertable into the mobile terminal. For example, if the apparatus (e.g., mobile terminal) employs a relatively large capacity MEGA-SIM card or a large capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large capacity flash memory device.
One or more corresponding functions and/or one or more combinations of functional blocks described for the controller can be implemented as a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any suitable combination thereof for performing the functions described herein. One or more of the functional block diagrams and/or one or more combinations of the functional block diagrams described with respect to the controller 20 of fig. 1 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.
While the invention has been described with reference to specific embodiments, it will be apparent to those skilled in the art that these descriptions are illustrative and not intended to limit the scope of the invention. Various modifications and adaptations of the present invention may occur to those skilled in the art, based on the principles of the present invention, and such modifications and adaptations are within the scope of the present invention.

Claims (14)

1. An air conditioning system, comprising: a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a high-side pressure vessel and a low-side element,
it is characterized in that the preparation method is characterized in that,
the compressor, the first heat exchanger and the second heat exchanger are respectively connected with a 1 st port, a 2 nd port and a 4 th port of the four-way valve,
the low pressure side element is connected between a suction port of the compressor and a 3 rd port of the four-way valve,
the high side pressure vessel is connected between the first heat exchanger and the second heat exchanger,
the high-pressure side pressure container comprises a container body and a bypass pipe arranged on the container body,
the bypass pipe connects the low pressure side element to communicate the tank body with the low pressure side element.
2. The air conditioning system of claim 1,
the high side pressure vessel further includes a first delivery pipe and a second delivery pipe,
the first delivery pipe and the second delivery pipe are respectively connected with the first heat exchanger and the second heat exchanger.
3. The air conditioning system of claim 2, further comprising:
and the first throttling element is arranged on a connecting pipeline connecting the first conveying pipe and the first heat exchanger and is used for throttling the refrigerant flowing through the first throttling element.
4. The air conditioning system of claim 1, further comprising:
and the valve unit is arranged on a pipeline connecting the bypass pipe and the low-pressure side element, and the opening and closing of the valve unit controls the on-off of the pipeline and/or the flow of the refrigerant in the pipeline.
5. The air conditioning system as claimed in claim 4, further comprising:
a controller that controls opening and closing of the valve unit according to at least one of a low pressure value of the air conditioning system, a degree of superheat of the air conditioning system, and a system temperature of the air conditioning system.
6. The air conditioning system as claimed in claim 5,
when the air conditioning system is in a heating operation mode,
when the duration time period that the low pressure value is smaller than a first threshold value is greater than a preset first time period, the controller controls the valve unit to be opened; or,
the controller controls the valve unit to open when the duration of the degree of superheat being less than a second threshold is greater than a predetermined second time period.
7. The air conditioning system as claimed in claim 5,
when the air conditioning system is in a heating operation mode,
when the duration of the low pressure value being greater than a third threshold value is greater than a predetermined third time period, the controller controls the valve unit to close; or,
the controller controls the valve unit to close when the duration of the degree of superheat being greater than a fourth threshold is greater than a predetermined fourth time period.
8. The air conditioning system as claimed in claim 5,
when the air conditioning system is in a cooling operation mode,
when the duration of the time period that the change value of the system temperature is greater than the fifth threshold value is greater than a predetermined fifth time period, the controller controls the valve unit to open; or,
the controller controls the valve unit to open when the duration of the system temperature being less than a sixth threshold is greater than a predetermined sixth time period.
9. The air conditioning system as claimed in claim 5,
when the air conditioning system is in a cooling operation mode,
when the duration of the time period in which the change value of the system temperature is less than the seventh threshold value is greater than a predetermined seventh time period, the controller controls the valve unit to close; or,
the controller controls the valve unit to close when the duration of the system temperature being greater than an eighth threshold is greater than a predetermined eighth time period.
10. A control method of an air conditioning system, the air conditioning system comprising: a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a high-pressure side pressure vessel, a low-pressure side element, and a valve unit,
the compressor, the first heat exchanger and the second heat exchanger are respectively connected with a 1 st port, a 2 nd port and a 4 th port of the four-way valve,
the low pressure side element is connected between a suction port of the compressor and a 3 rd port of the four-way valve,
the high side pressure vessel is connected between the first heat exchanger and the second heat exchanger,
the high-pressure side pressure container comprises a container body and a bypass pipe arranged on the container body,
the bypass pipe is connected to the low pressure side element to communicate the tank body with the low pressure side element,
the valve unit is provided on a pipe connecting the bypass pipe and the low pressure side element,
the control method is characterized by comprising the following steps:
and controlling the opening and closing of the valve unit according to at least one of a low pressure value of the air conditioning system, a superheat degree of the air conditioning system and a system temperature of the air conditioning system.
11. The control method of an air conditioning system according to claim 10,
when the air conditioning system is in a heating operation mode,
when the duration time of the low pressure value smaller than a first threshold value is larger than a preset first time period, controlling the valve unit to be opened; or,
and controlling the valve unit to be opened when the duration of the superheat degree less than a second threshold value is greater than a predetermined second time period.
12. The control method of an air conditioning system according to claim 10,
when the air conditioning system is in a heating operation mode,
when the duration time period that the low pressure value is greater than the third threshold value is greater than a preset third time period, controlling the valve unit to be closed; or,
and controlling the valve unit to be closed when the continuous time period that the superheat degree is larger than the fourth threshold value is larger than a preset fourth time period.
13. The control method of an air conditioning system according to claim 10,
when the air conditioning system is in a cooling operation mode,
when the duration time of the change value of the system temperature greater than the fifth threshold value is greater than a preset fifth time period, controlling the valve unit to be opened; or,
and controlling the valve unit to be opened when the duration time period that the system temperature is less than the sixth threshold value is greater than a preset sixth time period.
14. The control method of an air conditioning system according to claim 10,
when the air conditioning system is in a cooling operation mode,
when the duration time period that the change value of the system temperature is smaller than the seventh threshold value is larger than a preset seventh time period, controlling the valve unit to be closed; or,
and controlling the valve unit to be closed when the duration of the system temperature being greater than the eighth threshold value is greater than a predetermined eighth time period.
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CN109974202A (en) * 2019-04-03 2019-07-05 宁波奥克斯电气股份有限公司 A kind of control method slowing down frosting, device and air conditioner
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