CN111623420B - Air conditioner - Google Patents

Air conditioner Download PDF

Info

Publication number
CN111623420B
CN111623420B CN202010336625.0A CN202010336625A CN111623420B CN 111623420 B CN111623420 B CN 111623420B CN 202010336625 A CN202010336625 A CN 202010336625A CN 111623420 B CN111623420 B CN 111623420B
Authority
CN
China
Prior art keywords
compressor
heat exchanger
pressure
indoor heat
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010336625.0A
Other languages
Chinese (zh)
Other versions
CN111623420A (en
Inventor
常骞
李达君
徐春峰
赵希枫
吴林涛
刘伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hisense Shandong Air Conditioning Co Ltd
Original Assignee
Hisense Shandong Air Conditioning Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hisense Shandong Air Conditioning Co Ltd filed Critical Hisense Shandong Air Conditioning Co Ltd
Priority to CN202010336625.0A priority Critical patent/CN111623420B/en
Publication of CN111623420A publication Critical patent/CN111623420A/en
Application granted granted Critical
Publication of CN111623420B publication Critical patent/CN111623420B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0068—Indoor units, e.g. fan coil units characterised by the arrangement of refrigerant piping outside the heat exchanger within the unit casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/16—Arrangement or mounting thereof
    • 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
    • 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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

Landscapes

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

Abstract

The invention relates to the technical field of air conditioners, and discloses an air conditioner, which comprises: an indoor unit; the outdoor unit comprises a compressor, an outdoor heat exchanger, a first throttling element, a pressure sensor, an outdoor fan and a controller; the controller is configured to: when a starting signal sent by an indoor unit is received, the current pressure of an indoor heat exchanger is obtained, and the current exhaust superheat degree of a compressor is calculated; adjusting the current frequency of the compressor according to the starting signal, the current pressure of the indoor heat exchanger and the preset target pressure of the indoor heat exchanger; calculating a target exhaust superheat degree of the compressor; adjusting the opening degree of the first throttling element according to the current exhaust superheat degree of the compressor and the target exhaust superheat degree of the compressor; the rotating speed of the outdoor fan is adjusted according to the starting signal and the current pressure of the indoor heat exchanger, so that the indoor temperature is adjusted, a large number of parts do not need to be added in an indoor unit of the 24V communication air conditioner to link the variable frequency outdoor unit, and the cost is greatly saved.

Description

Air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner.
Background
An air conditioner, as a home appliance having functions of cooling, heating, dehumidifying, and purifying air, has high convenience, and thus is widely used in daily life of people.
Currently, for an air conditioner using 24V communication, since only switching value signals can be transmitted between an indoor unit and an outdoor unit, the air conditioner is generally applied only to a constant speed air conditioner. However, the constant speed air conditioner adopts a constant speed compressor, and adjusts the temperature by switching on and off the compressor, so that the room temperature is easily suddenly cooled and suddenly heated between the start and the stop of the compressor, the problem of large indoor temperature fluctuation exists, and power is consumed very much, which causes poor user experience.
At present, for the air conditioner adopting 24V communication, under the condition that an indoor unit is not replaced and 24V communication is continuously used, the electricity saving and comfortable benefits brought by adopting a variable frequency air conditioner are realized, and the commonly adopted solution in the market is as follows: a frequency conversion box and a mode frequency conversion inner machine are added in the indoor machine, and after a communication line is added, the frequency conversion box and the outdoor machine can be used for communication, so that the work of the linkage frequency conversion outdoor machine is realized. This is similar to ordinary frequency conversion unit machine that has the code, needs to change the indoor set, increases coil pipe, return air sensor and indoor outer communication line, and still need increase the heat preservation cotton of online pipe moreover, and the engineering volume is great, leads to with high costs.
Disclosure of Invention
The invention aims to provide an air conditioner which does not need to add a large number of components in an indoor unit of the air conditioner adopting 24V communication to link an outdoor unit of a variable frequency device for working, thereby greatly saving the cost.
In order to solve the above technical problem, the present invention provides an air conditioner, comprising:
an indoor unit, the indoor unit comprising:
the indoor heat exchanger is used for performing heat exchange between the refrigerant and indoor air;
an outdoor unit including:
the compressor is used for providing a refrigerant;
the outdoor heat exchanger is used for carrying out heat exchange between the refrigerant and outdoor air;
the first throttling element is used for controlling the refrigerant flow of a pipeline between the outdoor heat exchanger and the indoor heat exchanger;
a pressure sensor for detecting a pressure of the indoor heat exchanger;
an outdoor fan, and,
a controller configured to:
when a starting signal sent by the indoor unit is received, the current pressure of the indoor heat exchanger is obtained, and the current exhaust superheat degree of the compressor is calculated;
adjusting the current frequency of the compressor according to the starting signal, the current pressure of the indoor heat exchanger and a preset target pressure of the indoor heat exchanger;
calculating a target discharge superheat of the compressor after adjusting a current frequency of the compressor;
adjusting the opening degree of the first throttling element according to the current exhaust superheat degree of the compressor and the target exhaust superheat degree of the compressor;
and adjusting the rotating speed of the outdoor fan according to the starting signal and the current pressure of the indoor heat exchanger.
In some embodiments of the present application, adjusting the current frequency of the compressor according to the starting signal, the pressure of the indoor heat exchanger, and the preset target pressure of the indoor heat exchanger specifically includes:
when the starting signal is a refrigerating starting signal and the current pressure of the indoor heat exchanger is greater than the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be the upper limit value of the preset compressor frequency;
when the starting signal is a refrigerating starting signal and the current pressure of the indoor heat exchanger is less than or equal to the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be a preset lower limit value of the frequency of the compressor;
when the starting signal is a heating starting signal and the current pressure of the indoor heat exchanger is greater than the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be a preset lower limit value of the frequency of the compressor;
and when the starting signal is a heating starting signal and the current pressure of the indoor heat exchanger is less than or equal to the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be the preset upper limit value of the frequency of the compressor.
In some embodiments of the present application, the controller is further configured to:
calculating the pressure change rate of the indoor heat exchanger according to the current pressure of the indoor heat exchanger and the pressure of the indoor heat exchanger at the previous moment;
when the pressure change rate of the indoor heat exchanger is larger than a preset pressure change rate threshold value, adjusting the target pressure of the indoor heat exchanger to be an upper limit value of a preset target pressure;
when the pressure change rate of the indoor heat exchanger is smaller than a preset pressure change rate threshold value, adjusting the target pressure of the indoor heat exchanger to be a lower limit value of a preset target pressure;
when the pressure change rate of the indoor heat exchanger is equal to a preset pressure change rate threshold value, keeping the target pressure of the indoor heat exchanger unchanged.
In some embodiments of the present application, the controller is further configured to:
when the air conditioner is operated for the first time, an initial value of a target pressure of the indoor heat exchanger is obtained according to the outdoor ambient temperature.
In some embodiments of the present application, the controller is further configured to:
when a shutdown signal is received, recording the current pressure of the indoor heat exchanger to serve as an initial value of the target pressure of the indoor heat exchanger when the air conditioner operates next time.
In some embodiments of the present application, the calculating the target degree of superheat of the discharge gas of the compressor after adjusting the current frequency of the compressor specifically includes:
after adjusting the current frequency of the compressor, calculating a target discharge superheat of the compressor according to the current frequency of the compressor and an outdoor ambient temperature by the following formula:
DSH＝Fr×Ka+Kb×Tout
wherein DSH is a target discharge superheat of the compressor; frIs the current frequency of the compressor; ka、KbIs a preset correction coefficient; t isoutIs the outdoor ambient temperature.
In some embodiments of the present application, the adjusting the opening degree of the first throttling element according to the current exhaust superheat degree of the compressor and the target exhaust superheat degree of the compressor specifically includes:
calculating a discharge superheat difference value of the compressor according to the current discharge superheat of the compressor and a target discharge superheat of the compressor by the following formula:
e＝DSHcur-DSH
wherein e is the difference value of the exhaust superheat degree of the compressor; DSHcurThe current exhaust superheat degree of the compressor is obtained; DSH is a target discharge superheat degree of the compressor;
calculating the change rate of the discharge superheat degree of the compressor according to the current discharge superheat degree of the compressor and the discharge superheat degree of the compressor at the last moment;
obtaining the opening degree regulating quantity of the first throttling element according to the exhaust superheat difference value of the compressor and the change rate of the exhaust superheat of the compressor;
and adjusting the opening degree of the first throttling element according to the opening degree adjusting quantity of the first throttling element.
In some embodiments of the present application, adjusting the rotation speed of the outdoor fan according to the starting signal and the current pressure of the indoor heat exchanger specifically includes:
when the refrigeration starting signal of the starting signal is received and the current pressure of the indoor heat exchanger is smaller than a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset lower limit value of the rotating speed of the outdoor fan;
when the refrigeration starting signal of the starting signal is received and the current pressure of the indoor heat exchanger is greater than or equal to a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset upper limit value of the rotating speed of the outdoor fan;
when the starting signal is a heating starting signal and the current pressure of the indoor heat exchanger is smaller than a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset upper limit value of the rotating speed of the outdoor fan;
and when the refrigeration starting signal of the starting signal is received and the current pressure of the indoor heat exchanger is greater than or equal to a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset lower limit value of the rotating speed of the outdoor fan.
In some embodiments of the present application, the outdoor unit further includes:
a first end of the four-way valve is connected with an input end of the compressor, a second end of the four-way valve is connected with an output end of the compressor, a third end of the four-way valve is connected with a first end of the indoor heat exchanger, a fourth end of the four-way valve is connected with a first end of the outdoor heat exchanger, and a second end of the outdoor heat exchanger is connected with a first end of the first throttling element; and the number of the first and second groups,
the input end of the one-way valve is connected with the first end of the first throttling element, and the output end of the one-way valve is connected with the second end of the first throttling element;
the indoor unit further includes:
a second throttling element, a first end of the second throttling element being connected with a second end of the first throttling element, a second end of the second throttling element being connected with a second end of the indoor heat exchanger.
In some embodiments of the present application, the number of the pressure sensors is one, and the pressure sensor is disposed on a pipeline between the four-way valve and the indoor heat exchanger.
In some embodiments of the present application, the number of the pressure sensors is two, and the two pressure sensors are respectively a first pressure sensor and a second pressure sensor; the first pressure sensor is arranged at the output end of the compressor, and the second pressure sensor is arranged at the input end of the compressor
Compared with the prior art, the invention provides an air conditioner, which is characterized in that when a starting signal sent by an indoor unit is received, the controller is configured to adjust the current frequency of the compressor according to the starting signal, the current pressure of the indoor heat exchanger and the preset target pressure of the indoor heat exchanger, adjust the opening degree of the first throttling element according to the current exhaust superheat degree of the compressor and the target exhaust superheat degree of the compressor, adjust the rotating speed of the outdoor fan according to the starting signal and the current pressure of the indoor heat exchanger, thereby realizing the control of the temperature of the indoor heat exchanger and further realizing the adjustment of the indoor temperature, avoiding the need of adding a large number of parts in an indoor unit of the air conditioner adopting 24V communication to link with a variable frequency outdoor unit to work, and avoiding the change of the hardware structure of the indoor unit, thus providing a significant cost savings. In addition, for traditional air conditioner that adopts 24V communication, the air conditioner of this embodiment has realized frequency conversion control, has reduced the power consumption of air conditioner, has avoided the big problem of indoor temperature fluctuation simultaneously, has consequently improved user experience.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a flow path of a refrigerant in an air conditioner during a cooling state according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a flow path of a refrigerant in an air conditioner during a heating state according to an embodiment of the present invention;
fig. 4 is a graph illustrating a relationship between a target pressure of a compressor and an outdoor ambient temperature according to an embodiment of the present invention.
Wherein, 1, an indoor unit; 11. an indoor heat exchanger; 12. a second throttling element; 2. an outdoor unit; 21. a compressor; 22. an outdoor heat exchanger; 23. a first throttling element; 24. a pressure sensor; 25. a four-way valve; 26. a one-way valve; 27. a first filter; 28. a second filter; 29. a first shut-off valve; 30. a second stop valve; 31. a high-voltage switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
The embodiment of the invention provides an air conditioner, which comprises:
indoor unit 1, indoor unit 1 includes:
an indoor heat exchanger 11 for performing heat exchange between a refrigerant and indoor air;
an outdoor unit 2, the outdoor unit 2 comprising:
a compressor 21 for supplying a refrigerant;
an outdoor heat exchanger 22 for performing heat exchange between a refrigerant and outdoor air;
a first throttling element 23 for controlling a refrigerant flow rate of a pipeline between the outdoor heat exchanger 21 and the indoor heat exchanger 11;
a pressure sensor 24 for detecting a pressure of the indoor heat exchanger 11;
an outdoor fan (not shown in the drawings), and,
a controller (not shown).
Specifically, as shown in fig. 2, when the air conditioner is in a cooling operation, that is, the air conditioner is in a cooling state, the compressor 21 compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas; the discharged refrigerant gas is transferred to the outdoor heat exchanger 22, and the outdoor heat exchanger 22 serves as a condenser to condense the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through a condensation process. The refrigerant flowing out of the exterior heat exchanger 22 flows into the first throttling element 23, so that the high-temperature and high-pressure liquid-phase refrigerant flowing out of the exterior heat exchanger 22 is expanded into a low-pressure liquid-phase refrigerant. The refrigerant flowing out of the first throttling element 23 is transferred to the indoor heat exchanger 11 to be evaporated, and then is converted into a refrigerant gas in a low-temperature and low-pressure state, and is returned to the compressor 21. The indoor heat exchanger 22 serves as an evaporator during a refrigeration cycle, which can achieve a refrigeration effect by heat-exchanging latent heat of evaporation of a refrigerant with a material to be cooled.
As shown in fig. 3, when the air conditioner is in a heating operation, that is, the air conditioner is in a heating state, the compressor 21 compresses refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas; the discharged refrigerant gas is transferred to the indoor heat exchanger 11 to be condensed, the indoor heat exchanger 11 at this time serves as a condenser, the compressed refrigerant is condensed into a liquid phase, and heat is released to the surrounding environment through a condensation process. The refrigerant flowing out of the indoor heat exchanger 11 flows into the first throttling element 23 to expand the condensed liquid-phase refrigerant in a high-temperature and high-pressure state into a low-pressure liquid-phase refrigerant. The refrigerant flowing out of the first throttling element 23 flows into the outdoor heat exchanger 11 to be evaporated, and then is converted into a refrigerant gas in a low-temperature and low-pressure state and returned to the compressor 21. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
In a preferred embodiment, the outdoor unit 2 of the air conditioner of the present embodiment further includes:
a four-way valve 25, a first end of the four-way valve 25 being connected to the input end of the compressor 21, a second end of the four-way valve 25 being connected to the output end of the compressor 21, a third end of the four-way valve 25 being connected to the first end of the indoor heat exchanger 11, a fourth end of the four-way valve 25 being connected to the first end of the outdoor heat exchanger 22, and a second end of the outdoor heat exchanger 22 being connected to the first end of the first throttling element 23; and the number of the first and second groups,
a check valve 26, an input end of the check valve 26 is connected with a first end of the first throttling element 23, and an output end of the check valve 26 is connected with a second end of the first throttling element 23;
the indoor unit 11 further includes:
a second throttling element 12, a first end of the second throttling element 12 is connected with a second end of the first throttling element 23, and a second end of the second throttling element 12 is connected with a second end of the indoor heat exchanger 11.
It can be understood that, when the air conditioner is in a cooling state, the refrigerant gas discharged from the compressor 21 sequentially flows into the outdoor heat exchanger 22 through the second end and the fourth end of the four-way valve 25 to be condensed; a part of the refrigerant flowing out of the outdoor heat exchanger 22 flows into the check valve 26, and the other part of the refrigerant flows into the first throttling element 23; the refrigerant flowing out of the check valve 26 and the refrigerant flowing out of the first throttling element 23 are collected at the first end of the second throttling element 12, flow into the indoor heat exchanger 11 through the second throttling element 12, are evaporated, and then return to the compressor 21 through the four-way valve 25, as shown in fig. 2.
When the air conditioner is in a heating state, refrigerant gas discharged by the compressor 21 flows into the indoor heat exchanger 11 through the second end and the third end of the four-way valve to be condensed; the refrigerant flowing out of the indoor heat exchanger 11 sequentially flows into the outdoor heat exchanger 11 through the second throttling element 12 and the first throttling element 23 to be evaporated, and then returns to the compressor 21 through the four-way valve 25.
In the embodiment of the present invention, the types of the first and second restriction elements 23 and 12 may be set according to actual use conditions. Preferably, the first throttling element 23 of the present embodiment is an electronic expansion valve; the second throttling element 12 is a thermostatic expansion valve.
In a preferred embodiment, the outdoor unit 2 of the present embodiment further includes:
a first filter 27 provided at a first end of the first throttling element 23;
a second filter 28 provided at a second end of the first throttling element 23.
In the embodiment of the present invention, the first filter 27 is disposed at a first end of the first throttling element 23, and the second filter 28 is disposed at a second end of the first throttling element 23, so as to perform secondary filtration on the refrigerant flowing into the first throttling element 23.
Further, the outdoor unit 2 of the present embodiment further includes:
a first shutoff valve 29 provided in a line between the first throttling element 23 and the second throttling element 12;
and a second cut-off valve 30 provided on a pipe between the four-way valve 25 and the indoor heat exchanger 11.
In the embodiment of the present invention, the first and second shut-off valves 29 and 30 are provided so that the outdoor unit 2 and the indoor unit 1 can be easily installed by shutting off the transmission of the refrigerant in the pipe lines through the first and second shut-off valves 29 and 30 when the indoor unit 1 and the outdoor unit are installed.
Further, the outdoor unit 2 of the present embodiment further includes:
and the high-voltage switch 31 is arranged at the output end of the compressor 21 and used for sending a turn-off signal to the controller when detecting that the exhaust pressure of the compressor 21 is greater than a preset exhaust pressure threshold value, so that the controller controls the air conditioner to stop, thereby playing a protective role.
In the embodiment of the present invention, the positions and the number of the pressure sensors 24 may be set according to actual use conditions, and only the requirement of ensuring that the pressure of the indoor heat exchanger 11 can be detected is met, which is not limited by the present invention.
In a preferred embodiment, the number of the pressure sensors 24 is one, and the pressure sensor 24 is disposed on a pipeline between the four-way valve 25 and the indoor heat exchanger 11, as shown in fig. 1.
It can be understood that, when the air conditioner is in a cooling state, the pressure of the indoor heat exchanger 11 detected by the pressure sensor 24 is the low-pressure of the air conditioner, i.e. the suction pressure or the evaporation pressure on the inlet side of the compressor 21; when the air conditioner is in a heating state, the pressure of the indoor heat exchanger 11 detected by the pressure sensor 24 is a high-pressure of the air conditioner, that is, an exhaust pressure or a condensation pressure on an outlet side of the compressor 21.
In another preferred embodiment, the pressure sensors 24 are two, respectively a first pressure sensor and a second pressure sensor; the first pressure sensor is provided at an output end of the compressor 21, and the second pressure sensor is provided at an input end of the compressor 21.
As can be appreciated, the first pressure sensor is provided at the output end of the compressor 21 for detecting the discharge pressure or the condensing pressure at the outlet side of the compressor 21; the second pressure sensor is arranged at the input end of the compressor 21 and used for detecting the suction pressure or the evaporation pressure at the inlet side of the compressor 21; therefore, when the air conditioner is in a cooling state, the pressure value detected by the second pressure sensor is the pressure of the indoor heat exchanger 11; when the air conditioner is in a heating state, the pressure value detected by the first pressure sensor is the pressure of the indoor heat exchanger 11.
In the embodiment of the present invention, the controller of the outdoor unit 2 controls the cooling operation and the heating operation of the air conditioner according to the power-on signal sent by the indoor unit 1. The configuration of the controller is described in detail below.
The controller of the air conditioner of the present embodiment is configured to:
when a starting signal sent by the indoor unit 1 is received, acquiring the current pressure of the indoor heat exchanger 11, and calculating the current exhaust superheat degree of the compressor 21;
adjusting the current frequency of the compressor 21 according to the starting signal, the current pressure of the indoor heat exchanger 11 and a preset target pressure of the indoor heat exchanger 11;
calculating a target discharge superheat of the compressor 21 after adjusting the current frequency of the compressor 21;
adjusting the opening degree of the first throttling element 23 according to the current exhaust superheat degree of the compressor 21 and the target exhaust superheat degree of the compressor 21;
and adjusting the rotating speed of the outdoor fan according to the starting signal and the current pressure of the indoor heat exchanger 11.
In the embodiment of the present invention, when receiving the start-up signal sent by the indoor unit 1, the controller is configured to adjust the current frequency of the compressor 21 according to the start-up signal, the current pressure of the indoor heat exchanger 11 and the preset target pressure of the indoor heat exchanger 11, adjust the opening degree of the first throttling element 23 according to the current exhaust superheat degree of the compressor 21 and the target exhaust superheat degree of the compressor 21, and adjust the rotation speed of the outdoor fan according to the start-up signal and the current pressure of the indoor heat exchanger 11, so as to control the temperature of the indoor heat exchanger 11, and further adjust the indoor temperature, so that it is not necessary to add a large number of components to the indoor unit of the air conditioner using 24V communication to link with the variable frequency outdoor unit to work, and thus avoiding changing the hardware structure of the indoor unit, thus providing a significant cost savings. In addition, for traditional air conditioner that adopts 24V communication, the air conditioner of this embodiment has realized frequency conversion control, has reduced the power consumption of air conditioner, has avoided the big problem of indoor temperature fluctuation simultaneously, has consequently improved user experience.
In a preferred embodiment, in the configuration of the controller in this embodiment, the adjusting the current frequency of the compressor according to the starting signal, the current pressure of the indoor heat exchanger, and the preset target pressure of the indoor heat exchanger specifically includes:
when the starting signal is a refrigerating starting signal and the current pressure of the indoor heat exchanger is greater than the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be the upper limit value of the preset compressor frequency;
when the starting signal is a refrigerating starting signal and the current pressure of the indoor heat exchanger is less than or equal to the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be a preset lower limit value of the frequency of the compressor;
when the starting signal is a heating starting signal and the current pressure of the indoor heat exchanger is greater than the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be a preset lower limit value of the frequency of the compressor;
and when the starting signal is a heating starting signal and the current pressure of the indoor heat exchanger is less than or equal to the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be the preset upper limit value of the frequency of the compressor.
It should be noted that the indoor unit 1 may send a 24V alternating-current cooling start signal and a heating start signal to the outdoor unit 2, that is, the start signal sent by the indoor unit 1 includes the cooling start signal and the heating start signal; the refrigerating starting signal is used for indicating and controlling the air conditioner to perform refrigerating operation; and the heating starting signal is used for indicating and controlling the air conditioner to perform heating operation. Under the condition that the starting signal received by the controller is the refrigerating starting signal, when the current pressure of the indoor heat exchanger 11 is greater than the target pressure of the indoor heat exchanger 11, increasing the current frequency of the compressor 21 to an upper limit value of the compressor frequency; and when the current pressure of the indoor heat exchanger 11 is less than or equal to the target pressure of the indoor heat exchanger 11, reducing the current frequency of the compressor 21 to the lower limit value of the compressor frequency. When the starting signal received by the controller is the heating starting signal, and when the current pressure of the indoor heat exchanger 11 is greater than the target pressure of the indoor heat exchanger 11, reducing the current frequency of the compressor 21 to the lower limit value of the compressor frequency; and when the current pressure of the indoor heat exchanger 11 is less than or equal to the target pressure of the indoor heat exchanger 11, raising the current frequency of the compressor 21 to the upper limit value of the compressor frequency. The upper limit value and the lower limit value of the compressor frequency can be set according to actual use conditions; the corresponding upper and lower limit values of the compressor frequency can be obtained by table lookup, for example.
In a preferred implementation manner, the controller of this embodiment is further configured to:
calculating a pressure change rate of the indoor heat exchanger 11 according to the current pressure of the indoor heat exchanger 11 and the pressure of the indoor heat exchanger 11 at the previous moment;
when the pressure change rate of the indoor heat exchanger 11 is greater than a preset pressure change rate threshold, adjusting the target pressure of the indoor heat exchanger 11 to be an upper limit value of a preset target pressure;
when the pressure change rate of the indoor heat exchanger 11 is smaller than a preset pressure change rate threshold value, adjusting the target pressure of the indoor heat exchanger 11 to be a lower limit value of a preset target pressure;
when the pressure change rate of the indoor heat exchanger 11 is equal to a preset pressure change rate threshold, the target pressure of the indoor heat exchanger 11 is kept unchanged.
Specifically, in adjusting the current frequency of the compressor 21, the controller adjusts the target pressure of the indoor heat exchanger according to the pressure change rate of the indoor heat exchanger 11. Specifically, when the pressure change rate of the indoor heat exchanger 11 is greater than a preset pressure change rate threshold, increasing the target pressure of the indoor heat exchanger 11 to a preset upper limit value of the target pressure; when the pressure change rate of the indoor heat exchanger 11 is smaller than a preset pressure change rate threshold value, reducing the target pressure of the indoor heat exchanger 11 to a lower limit value of a preset target pressure; when the pressure change rate of the indoor heat exchanger 11 is equal to a preset pressure change rate threshold, the target pressure of the indoor heat exchanger does not need to be adjusted. It should be noted that the preset pressure change rate threshold may be set according to an actual use condition, for example, a pressure change rate of a laboratory under a test standard working condition is used as the pressure change rate threshold. In addition, both the upper limit value of the target pressure and the lower limit value of the target pressure may be set according to actual use conditions, which is not limited by the present invention.
In a preferred implementation manner, the controller of this embodiment is further configured to:
and when the air conditioner operates for the first time, calculating according to the outdoor environment temperature to obtain an initial value of the target pressure of the indoor heat exchanger.
As can be appreciated, the controller is also used to obtain the outdoor ambient temperature; when the air conditioner operates for the first time, the controller obtains an initial value of the target pressure of the indoor heat exchanger according to the outdoor environment temperature and a preset first mapping relation; wherein the first mapping is used to indicate a target pressure of the indoor heat exchanger corresponding to an outdoor ambient temperature. The first mapping relationship may be a function curve of the outdoor ambient temperature and the target pressure of the indoor heat exchanger, as shown in fig. 4; of course, this is only one expression of the first mapping relationship, and the present invention is not limited thereto.
In a preferred implementation manner, the controller of this embodiment may be further configured to:
when a shutdown signal is received, recording the current pressure of the indoor heat exchanger 11 as an initial value of the target pressure of the indoor heat exchanger when the air conditioner operates next time.
In a preferred embodiment, in the configuration of the controller of this embodiment, the calculating the current exhaust superheat degree of the compressor 21 specifically includes:
acquiring the exhaust temperature of the compressor 21, and acquiring a corresponding saturation temperature according to the current pressure of the indoor heat exchanger 11;
from the discharge temperature of the compressor 21 and the saturation temperature, the current discharge superheat of the compressor 21 is calculated by the following formula:
DSHcur＝Tcomp-Tp
wherein, DSHcurIs the current discharge superheat of the compressor 21; t iscompIs the discharge temperature of the compressor 21; t ispIs the saturation temperature.
Specifically, after the current pressure of the indoor heat exchanger 11 is obtained, the saturation temperature may be obtained according to the current pressure of the indoor heat exchanger 11 and a preset second mapping relationship; then, the current discharge superheat of the compressor 21 is calculated and obtained by the above formula according to the discharge temperature of the compressor 21 and the saturation temperature. Wherein the second mapping is used to indicate a saturation temperature corresponding to a pressure of the indoor heat exchanger.
Of course, the above is only one embodiment of calculating the current exhaust superheat degree of the compressor 21 in the embodiment of the present invention, and those skilled in the art may also calculate the current exhaust superheat degree of the compressor 21 in other manners, which is not limited by the present invention.
In a preferred implementation manner, in the configuration of the controller in this embodiment, the calculating the target degree of superheat of the exhaust gas of the compressor 21 after adjusting the current frequency of the compressor 21 specifically includes:
after adjusting the current frequency of the compressor 21, a target discharge superheat of the compressor 21 is calculated from the current frequency of the compressor 21 and the outdoor ambient temperature by the following formula:
DSH＝Fr×Ka+Kb×Tout
wherein DSH is a target discharge superheat of the compressor 21; frIs the current frequency of the compressor 21; ka、KbIs a preset correction coefficient; t isoutIs the outdoor ambient temperature.
Of course, this is only one embodiment of calculating the target degree of superheat of the discharge gas of the compressor 21 in the embodiment of the present invention, and those skilled in the art may also calculate the target degree of superheat of the discharge gas of the compressor 21 in other manners, which is not limited by the present invention.
In a preferred embodiment, in the configuration of the controller of the present embodiment, the adjusting the opening degree of the first throttling element 23 according to the current exhaust superheat degree of the compressor 21 and the target exhaust superheat degree of the compressor 21 specifically includes:
calculating a discharge superheat difference value of the compressor 21 from the current discharge superheat of the compressor 21 and the target discharge superheat of the compressor 21 by:
e＝DSHcur-DSH
wherein e is a difference value of the discharge superheat degree of the compressor 21; DSHcurIs the current discharge superheat of the compressor 21; DSH is a target discharge superheat of the compressor 21;
calculating the change rate of the discharge superheat degree of the compressor 21 according to the current discharge superheat degree of the compressor 21 and the discharge superheat degree of the compressor 21 at the last moment;
obtaining an opening degree adjustment amount of the first throttling element 23 according to the difference value of the exhaust superheat degree of the compressor 21 and the change rate of the exhaust superheat degree of the compressor 21;
the opening degree of the first throttling element 23 is adjusted according to the opening degree adjusting amount of the first throttling element 23.
It is understood that the controller is previously provided with a third map indicating a relationship between the difference in the degree of superheat of the discharge gas of the compressor 21 and the rate of change in the degree of superheat of the discharge gas of the compressor 21, and the opening degree adjustment amount of the first throttling element 23. Therefore, after the difference of the discharge superheat of the compressor 21 and the change rate of the discharge superheat of the compressor 21 are calculated, the corresponding opening degree adjustment amount of the first throttling element 23 can be obtained according to the third mapping relation; finally, on the basis of the current opening degree of the first throttling element 23, the opening degree of the first throttling element 23 is adjusted according to the opening degree adjusting amount of the first throttling element 23. Specifically, when the opening degree adjustment amount of the first throttling element 23 is obtained to be + 10% and the current opening degree of the first throttling element 23 is 70%, the adjusted opening degree of the first throttling element 23 is 80%.
In a preferred embodiment, in the configuration of the controller in this embodiment, the adjusting the rotation speed of the outdoor fan according to the starting signal and the current pressure of the indoor heat exchanger specifically includes:
when the starting signal is a refrigerating starting signal and the current pressure of the indoor heat exchanger 11 is smaller than a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset lower limit value of the rotating speed of the outdoor fan;
when the starting signal is a refrigerating starting signal of the starting signal and the current pressure of the indoor heat exchanger 11 is greater than or equal to a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset upper limit value of the rotating speed of the outdoor fan;
when the starting signal is a heating starting signal and the current pressure of the indoor heat exchanger 11 is smaller than a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset upper limit value of the rotating speed of the outdoor fan;
and when the refrigeration starting signal of the starting signal is received and the current pressure of the indoor heat exchanger 11 is greater than or equal to a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset lower limit value of the rotating speed of the outdoor fan.
Specifically, when the starting signal received by the controller is the refrigerating starting signal, and when the current pressure of the indoor heat exchanger 11 is smaller than a preset pressure threshold, the rotating speed of the outdoor fan is reduced to a preset lower limit value of the rotating speed of the outdoor fan; when the current pressure of the indoor heat exchanger 11 is greater than or equal to a preset pressure threshold, increasing the rotating speed of the outdoor fan to a preset upper limit value of the rotating speed of the outdoor fan; under the condition that the starting signal received by the controller is the heating starting signal, when the current pressure of the indoor heat exchanger 11 is smaller than a preset pressure threshold value, increasing the rotating speed of the outdoor fan to a preset upper limit value of the rotating speed of the outdoor fan; and when the current pressure of the indoor heat exchanger 11 is greater than or equal to a preset pressure threshold value, reducing the rotating speed of the outdoor fan to a preset lower limit value of the rotating speed of the outdoor fan. And the upper limit value of the rotating speed of the outdoor fan and the lower limit value of the rotating speed of the outdoor fan are determined according to the current frequency of the compressor. Specifically, after the current frequency of the compressor 21 is obtained, the corresponding upper limit value of the outdoor fan rotation speed and the corresponding lower limit value of the outdoor fan rotation speed may be obtained according to a preset fourth mapping relationship; and the fourth mapping relation is used for indicating an upper limit value and a lower limit value of the rotating speed of the outdoor fan corresponding to the frequency of the compressor.
In summary, the present invention provides an air conditioner, including an indoor unit 1, where the indoor unit 1 includes: an indoor heat exchanger 11 for performing heat exchange between a refrigerant and indoor air; and an outdoor unit 2, the outdoor unit 2 including: a compressor 21 for supplying a refrigerant; an outdoor heat exchanger 22 for performing heat exchange between a refrigerant and outdoor air; a first throttling element 23 for controlling a refrigerant flow rate of a pipeline between the outdoor heat exchanger 21 and the indoor heat exchanger 11; a pressure sensor 24 for detecting a pressure of the indoor heat exchanger 11; an outdoor fan; a controller configured to: when a starting signal sent by the indoor unit 1 is received, acquiring the current pressure of the indoor heat exchanger 11, and calculating the current exhaust superheat degree of the compressor 21; adjusting the current frequency of the compressor 21 according to the starting signal, the current pressure of the indoor heat exchanger 11 and a preset target pressure of the indoor heat exchanger 11; calculating a target discharge superheat of the compressor 21 after adjusting the current frequency of the compressor 21; adjusting the opening degree of the first throttling element 23 according to the current exhaust superheat degree of the compressor 21 and the target exhaust superheat degree of the compressor 21; and adjusting the rotating speed of the outdoor fan according to the starting signal and the current pressure of the indoor heat exchanger 11. When a starting signal sent by the indoor unit 1 is received, the controller is configured to adjust the current frequency of the compressor 21 according to the starting signal, the current pressure of the indoor heat exchanger 11 and the preset target pressure of the indoor heat exchanger 11, adjust the opening degree of the first throttling element 23 according to the current exhaust superheat degree of the compressor 21 and the target exhaust superheat degree of the compressor 21, and adjust the rotating speed of the outdoor fan according to the starting signal and the current pressure of the indoor heat exchanger 11, so as to control the temperature of the indoor heat exchanger 11 and further adjust the indoor temperature, so that the indoor unit of the air conditioner adopting 24V communication does not need to be added with a large number of components to be linked with the variable frequency outdoor unit to work, and the hardware structure of the indoor unit is prevented from being changed, thus providing a significant cost savings. In addition, for traditional air conditioner that adopts 24V communication, the air conditioner of this embodiment has realized frequency conversion control, has reduced the power consumption of air conditioner, has avoided the big problem of indoor temperature fluctuation simultaneously, has consequently improved user experience.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (10)

1. An air conditioner, comprising:
an indoor unit, the indoor unit comprising:
the indoor heat exchanger is used for performing heat exchange between the refrigerant and indoor air;
an outdoor unit including:
the compressor is used for providing a refrigerant;
the outdoor heat exchanger is used for carrying out heat exchange between the refrigerant and outdoor air;
the first throttling element is used for controlling the refrigerant flow of a pipeline between the outdoor heat exchanger and the indoor heat exchanger;
a pressure sensor for detecting a pressure of the indoor heat exchanger;
an outdoor fan, and,
a controller configured to:
when a starting signal sent by the indoor unit is received, the current pressure of the indoor heat exchanger is obtained, and the current exhaust superheat degree of the compressor is calculated;
adjusting the current frequency of the compressor according to the starting signal, the current pressure of the indoor heat exchanger and a preset target pressure of the indoor heat exchanger;
calculating a target discharge superheat of the compressor after adjusting a current frequency of the compressor;
adjusting the opening degree of the first throttling element according to the current exhaust superheat degree of the compressor and the target exhaust superheat degree of the compressor;
adjusting the rotating speed of the outdoor fan according to the starting signal and the current pressure of the indoor heat exchanger;
the controller further configured to:
calculating the pressure change rate of the indoor heat exchanger according to the current pressure of the indoor heat exchanger and the pressure of the indoor heat exchanger at the previous moment;
when the pressure change rate of the indoor heat exchanger is larger than a preset pressure change rate threshold value, adjusting the target pressure of the indoor heat exchanger to be an upper limit value of a preset target pressure;
when the pressure change rate of the indoor heat exchanger is smaller than a preset pressure change rate threshold value, adjusting the target pressure of the indoor heat exchanger to be a lower limit value of a preset target pressure;
when the pressure change rate of the indoor heat exchanger is equal to a preset pressure change rate threshold value, keeping the target pressure of the indoor heat exchanger unchanged.
2. The air conditioner according to claim 1, wherein the adjusting the current frequency of the compressor according to the start-up signal, the pressure of the indoor heat exchanger, and a preset target pressure of the indoor heat exchanger specifically comprises:
when the starting signal is a refrigerating starting signal and the current pressure of the indoor heat exchanger is greater than the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be the upper limit value of the preset compressor frequency;
when the starting signal is a refrigerating starting signal and the current pressure of the indoor heat exchanger is less than or equal to the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be a preset lower limit value of the frequency of the compressor;
when the starting signal is a heating starting signal and the current pressure of the indoor heat exchanger is greater than the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be a preset lower limit value of the frequency of the compressor;
and when the starting signal is a heating starting signal and the current pressure of the indoor heat exchanger is less than or equal to the target pressure of the indoor heat exchanger, adjusting the current frequency of the compressor to be the preset upper limit value of the frequency of the compressor.
3. The air conditioner of claim 2, wherein the controller is further configured to:
when the air conditioner is operated for the first time, an initial value of a target pressure of the indoor heat exchanger is obtained according to the outdoor ambient temperature.
4. The air conditioner of claim 2, wherein the controller is further configured to:
when a shutdown signal is received, recording the current pressure of the indoor heat exchanger to serve as an initial value of the target pressure of the indoor heat exchanger when the air conditioner operates next time.
5. The air conditioner according to any one of claims 1 to 4, wherein said calculating a target discharge superheat of said compressor after adjusting a current frequency of said compressor, comprises:
after adjusting the current frequency of the compressor, calculating a target discharge superheat of the compressor according to the current frequency of the compressor and an outdoor ambient temperature by the following formula:
DSH＝Fr×Ka+Kb×Tout
wherein DSH is a target discharge superheat of the compressor; frIs the current frequency of the compressor; ka、KbIs a preset correction coefficient; t isoutIs the outdoor ambient temperature.
6. The air conditioner as claimed in claim 5, wherein said adjusting the opening degree of the first throttling element according to the current discharge superheat degree of the compressor and the target discharge superheat degree of the compressor comprises:
calculating a discharge superheat difference value of the compressor according to the current discharge superheat of the compressor and a target discharge superheat of the compressor by the following formula:
e＝DSHcur-DSH
wherein e is the difference value of the exhaust superheat degree of the compressor; DSHcurThe current exhaust superheat degree of the compressor is obtained; DSH is a target discharge superheat degree of the compressor;
calculating the change rate of the discharge superheat degree of the compressor according to the current discharge superheat degree of the compressor and the discharge superheat degree of the compressor at the last moment;
obtaining the opening degree regulating quantity of the first throttling element according to the exhaust superheat difference value of the compressor and the change rate of the exhaust superheat of the compressor;
and adjusting the opening degree of the first throttling element according to the opening degree adjusting quantity of the first throttling element.
7. The air conditioner according to any one of claims 1 to 4, wherein said adjusting the rotation speed of the outdoor fan according to the starting signal and the current pressure of the indoor heat exchanger specifically comprises:
when the refrigeration starting signal of the starting signal is received and the current pressure of the indoor heat exchanger is smaller than a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset lower limit value of the rotating speed of the outdoor fan;
when the refrigeration starting signal of the starting signal is received and the current pressure of the indoor heat exchanger is greater than or equal to a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset upper limit value of the rotating speed of the outdoor fan;
when the starting signal is a heating starting signal and the current pressure of the indoor heat exchanger is smaller than a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset upper limit value of the rotating speed of the outdoor fan;
and when the refrigeration starting signal of the starting signal is received and the current pressure of the indoor heat exchanger is greater than or equal to a preset pressure threshold value, adjusting the rotating speed of the outdoor fan to be a preset lower limit value of the rotating speed of the outdoor fan.
8. The air conditioner according to any one of claims 1 to 4, wherein the outdoor unit further comprises:
a first end of the four-way valve is connected with an input end of the compressor, a second end of the four-way valve is connected with an output end of the compressor, a third end of the four-way valve is connected with a first end of the indoor heat exchanger, a fourth end of the four-way valve is connected with a first end of the outdoor heat exchanger, and a second end of the outdoor heat exchanger is connected with a first end of the first throttling element; and the number of the first and second groups,
the input end of the one-way valve is connected with the first end of the first throttling element, and the output end of the one-way valve is connected with the second end of the first throttling element;
the indoor unit further includes:
a second throttling element, a first end of the second throttling element being connected with a second end of the first throttling element, a second end of the second throttling element being connected with a second end of the indoor heat exchanger.
9. The air conditioner according to claim 8, wherein the pressure sensor is one, and the pressure sensor is provided on a pipe between the four-way valve and the indoor heat exchanger.
10. The air conditioner according to claim 8, wherein the pressure sensors are two, a first pressure sensor and a second pressure sensor; the first pressure sensor is arranged at the output end of the compressor, and the second pressure sensor is arranged at the input end of the compressor.
CN202010336625.0A 2020-04-26 2020-04-26 Air conditioner Active CN111623420B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010336625.0A CN111623420B (en) 2020-04-26 2020-04-26 Air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010336625.0A CN111623420B (en) 2020-04-26 2020-04-26 Air conditioner

Publications (2)

Publication Number Publication Date
CN111623420A CN111623420A (en) 2020-09-04
CN111623420B true CN111623420B (en) 2021-08-17

Family

ID=72258101

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010336625.0A Active CN111623420B (en) 2020-04-26 2020-04-26 Air conditioner

Country Status (1)

Country Link
CN (1) CN111623420B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112283870B (en) * 2020-10-30 2021-11-23 广东Tcl智能暖通设备有限公司 Air conditioner outdoor unit control method and system and computer readable storage medium
CN112344539A (en) * 2020-11-12 2021-02-09 广东积微科技有限公司 Control method of variable frequency window air conditioner system
CN113432277B (en) * 2021-06-28 2022-03-29 宁波奥克斯电气股份有限公司 External fan rotating speed control method and air conditioner
CN115111701B (en) * 2022-07-13 2024-05-28 广东美的制冷设备有限公司 Air conditioner control method, controller, air conditioner and storage medium

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04203717A (en) * 1990-11-30 1992-07-24 Hitachi Ltd Rotating speed control method of outdoor fan for air-cooled air-conditioner
JPH11325638A (en) * 1998-05-08 1999-11-26 Matsushita Seiko Co Ltd Multiroom type of air conditioner
CN101338948A (en) * 2008-05-09 2009-01-07 浙江盾安人工环境设备股份有限公司 Refrigeration system provided with electronic expansion valve opening control device
CN102518595A (en) * 2011-12-13 2012-06-27 Tcl空调器(中山)有限公司 Method for controlling rotating speed of outer fan of multi-split air conditioner
CN103884140A (en) * 2014-02-21 2014-06-25 海信（山东）空调有限公司 Method and system for controlling discharge superheat degree of air conditioning compressor
CN105509255A (en) * 2016-01-04 2016-04-20 广东美的暖通设备有限公司 Control method of air conditioning system and air conditioning system
CN107062518A (en) * 2017-01-09 2017-08-18 广东美的制冷设备有限公司 A kind of air-conditioner control method and control device
CN107255306A (en) * 2017-05-19 2017-10-17 海信（山东）空调有限公司 A kind of Combined frequency-change air-conditioning and its control method
CN109099556A (en) * 2018-08-27 2018-12-28 海信（山东）空调有限公司 Low temperature refrigeration of air conditioner control method and air conditioner
CN111023373A (en) * 2020-01-02 2020-04-17 珠海格力电器股份有限公司 Heat pump system and air conditioner

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04203717A (en) * 1990-11-30 1992-07-24 Hitachi Ltd Rotating speed control method of outdoor fan for air-cooled air-conditioner
JPH11325638A (en) * 1998-05-08 1999-11-26 Matsushita Seiko Co Ltd Multiroom type of air conditioner
CN101338948A (en) * 2008-05-09 2009-01-07 浙江盾安人工环境设备股份有限公司 Refrigeration system provided with electronic expansion valve opening control device
CN102518595A (en) * 2011-12-13 2012-06-27 Tcl空调器(中山)有限公司 Method for controlling rotating speed of outer fan of multi-split air conditioner
CN103884140A (en) * 2014-02-21 2014-06-25 海信（山东）空调有限公司 Method and system for controlling discharge superheat degree of air conditioning compressor
CN105509255A (en) * 2016-01-04 2016-04-20 广东美的暖通设备有限公司 Control method of air conditioning system and air conditioning system
CN107062518A (en) * 2017-01-09 2017-08-18 广东美的制冷设备有限公司 A kind of air-conditioner control method and control device
CN107255306A (en) * 2017-05-19 2017-10-17 海信（山东）空调有限公司 A kind of Combined frequency-change air-conditioning and its control method
CN109099556A (en) * 2018-08-27 2018-12-28 海信（山东）空调有限公司 Low temperature refrigeration of air conditioner control method and air conditioner
CN111023373A (en) * 2020-01-02 2020-04-17 珠海格力电器股份有限公司 Heat pump system and air conditioner

Also Published As

Publication number Publication date
CN111623420A (en) 2020-09-04

Similar Documents

Publication Publication Date Title
CN111623420B (en) Air conditioner
CN109855281B (en) Air conditioner heat exchange device and air conditioner
JP3290306B2 (en) Air conditioner
CN200996753Y (en) Refrigerating system of intermediate air-compensating compressor with economizer
CN105371545B (en) The refrigerant circulation amount adjustment method of air conditioner and its refrigeration system
CN111780362B (en) Air conditioner and control method thereof
CN101109592A (en) Temperature emergent state controlling means for air conditioner compressor air suction port
CN105378392B (en) Air-conditioning device
CN106931545B (en) Heat pump enthalpy-spraying system, control method thereof and air conditioner
KR100378822B1 (en) Power saving air cooling method of inverter air-conditioner driving
CN111928435A (en) Air conditioner
CN109114847A (en) A kind of air-conditioning and its control method
JP3668750B2 (en) Air conditioner
CN111928410A (en) Control method for multi-split air conditioning unit
JP2003106610A (en) Refrigeration unit
CN113959080B (en) Control method for electronic expansion valve of air conditioning unit
JPH1030853A (en) Controller for air conditioner
CN114963442A (en) Air conditioner and control method thereof
CN114151935A (en) Air conditioning system
JP2002147819A (en) Refrigeration unit
CN209027144U (en) A kind of air-conditioning
CN217441996U (en) Machine room air conditioner capable of refrigerating at low load
CN216432172U (en) Variable-flow thermostatic expansion valve air conditioning system
WO2023083040A1 (en) Air conditioner
CN114738867B (en) Evaporation and cooling combined air conditioning unit and control method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant