CN112032826A - Air conditioning unit and control method thereof - Google Patents

Air conditioning unit and control method thereof Download PDF

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Publication number
CN112032826A
CN112032826A CN202010878395.0A CN202010878395A CN112032826A CN 112032826 A CN112032826 A CN 112032826A CN 202010878395 A CN202010878395 A CN 202010878395A CN 112032826 A CN112032826 A CN 112032826A
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China
Prior art keywords
heat exchanger
compressor
oil
lubricating oil
indoor
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Granted
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CN202010878395.0A
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Chinese (zh)
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CN112032826B (en
Inventor
刘江彬
任滔
宋强
刘景升
李银银
孟庆良
荣丹
阚荣强
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202010878395.0A priority Critical patent/CN112032826B/en
Publication of CN112032826A publication Critical patent/CN112032826A/en
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    • 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
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/86—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
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Mathematical Physics (AREA)
  • Fuzzy Systems (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning unit and a control method thereof. The invention aims to solve the problems of large power consumption and long heating time of the mode of electrically heating and lifting the oil temperature at the bottom of the compressor in the conventional air conditioning unit. For this purpose, in the present invention, when the actual oil temperature value of the lubricating oil in the oil sump at the bottom of the compressor is less than the first oil temperature threshold value, the lubricating oil at the bottom of the compressor may be heated by starting the lubricating oil heat exchanger at the bottom of the compressor; when the actual temperature value of the refrigerant at the outlet end of the lubricating oil heat exchanger is smaller than the actual temperature value of the side wall of the compressor, the outlet end of the lubricating oil heat exchanger can be communicated with the inlet end of the regenerative heat exchanger through the throttling device, and the waste heat of the side wall of the compressor is recovered through the regenerative heat exchanger. Therefore, the lubricating oil at the bottom of the compressor can be heated and the waste heat of the outer side wall of the compressor can be recovered at the same time, so that the refrigerating or heating effect of the compressor is improved.

Description

Air conditioning unit and control method thereof
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning unit and a control method thereof.
Background
The air conditioning unit generally comprises a compressor, an outdoor heat exchanger, an electronic expansion valve, an indoor heat exchanger and other devices, and the purpose of heating or refrigerating the indoor space is achieved through the circulation of a refrigerant in the devices. In the heating or refrigerating process of the air conditioning unit, the oil temperature of the lubricating oil in the oil pool at the bottom of the compressor is an important factor influencing the operation reliability of the compressor. For example, the oil temperature superheat degree of the high-pressure cavity compressor is generally required to be more than 5 ℃, the oil temperature superheat degree of the low-pressure cavity compressor is generally required to be more than 10 ℃, the high-pressure cavity compressor and the low-pressure cavity compressor can keep a good operation state under the condition of meeting the oil temperature requirement, and the abrasion of each part of the compressor is minimum; when the compressor runs at a low frequency below 55Hz, the oil temperature superheat degree of the high-pressure cavity compressor and the oil temperature superheat degree of the low-pressure cavity compressor are both greatly reduced and cannot meet the requirement of the superheat degree, so that the problems that parts of the compressor are seriously abraded and the compressor is even damaged occur.
The current compressor generally increases the temperature of the lubricating oil at the bottom of the compressor by arranging an electric heating belt at the bottom of the compressor. However, the method of increasing the oil temperature at the bottom of the compressor by electric heating has disadvantages of large power consumption, long heating time, and difficulty in controlling the oil temperature of the lubricating oil.
Accordingly, there is a need in the art for a new air conditioning unit and a method of controlling the same to address the above-mentioned problems.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the defects that the electric heating mode for increasing the oil temperature at the bottom of the compressor in the existing air conditioning unit has high power consumption, long heating time and difficulty in controlling the oil temperature of lubricating oil, the invention provides an air conditioning unit and a control method thereof.
Firstly, the air conditioning unit provided by the invention comprises a compressor, an indoor heat exchanger, an indoor electronic expansion valve, an outdoor electronic expansion valve and an outdoor heat exchanger, wherein the first end of the indoor heat exchanger is communicated with the first end of the indoor electronic expansion valve; a lubricating oil heat exchanger is arranged at the bottom of the compressor, and the inlet end of the lubricating oil heat exchanger is communicated with an exhaust port of the compressor; a regenerative heat exchanger is arranged on the outer side wall of the compressor, and the outlet end of the regenerative heat exchanger is communicated with the air suction port of the compressor; the air conditioning unit further comprises a control unit; the control unit can selectively communicate one of the second end of the indoor heat exchanger and the second end of the outdoor heat exchanger with the exhaust port of the compressor and communicate the other with the suction port of the compressor according to the indoor actual temperature value and the indoor target temperature value set by a user so as to control the air conditioning unit to enter a refrigerating or heating working mode; the control unit can also selectively communicate the outlet end of the lubricating oil heat exchanger with the second end of the indoor heat exchanger or with the first end of the outdoor heat exchanger through a throttling device and selectively communicate the inlet end of the regenerative heat exchanger with the first end of the outdoor electronic expansion valve or with the outlet of the throttling device according to the working mode of the air conditioning unit, the actual oil temperature value of the lubricating oil in the oil pool at the bottom of the compressor, the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger and the actual side wall temperature value of the outer side wall of the compressor.
As a preferable technical solution of the air conditioning unit provided by the present invention, the throttling device includes a first throttling element, a second throttling element and a third throttling element; the outlet end of the lubricating oil heat exchanger is communicated with the second end of the indoor heat exchanger through the first throttling element, the outlet end of the lubricating oil heat exchanger is communicated with the first end of the outdoor heat exchanger through the second throttling element, and the outlet end of the lubricating oil heat exchanger is communicated with the inlet end of the regenerative heat exchanger through the third throttling element; the control unit is in communication connection with the first, second and third throttling elements; the control unit controls the first throttling element, the second throttling element and the third throttling element to selectively communicate the outlet end of the lubricating oil heat exchanger with the second end of the indoor heat exchanger or the first end of the outdoor heat exchanger through a throttling device, and selectively communicate the inlet end of the regenerative heat exchanger with the first end of the electronic expansion valve or the outlet of the throttling device.
As a preferred technical solution of the air conditioning unit provided by the present invention, an exhaust port of the compressor is connected to a first end of a four-way reversing valve of the air conditioning unit, a second end of the indoor heat exchanger is connected to a second end of the four-way reversing valve, an air suction port of the compressor is connected to a third end of the four-way reversing valve, and a second end of the outdoor heat exchanger is connected to a fourth end of the four-way reversing valve; the four-way reversing valve is in communication connection with the control unit; the control unit controls the four-way reversing valve to conduct the first end and the second end of the four-way reversing valve and conduct the third end and the fourth end of the four-way reversing valve so as to control the air conditioning unit to enter a heating working mode; and the control unit controls the four-way reversing valve to conduct the first end and the fourth end and conduct the second end and the third end of the four-way reversing valve so as to control the air conditioning unit to enter a refrigeration working mode.
As a preferred technical solution of the air conditioning unit provided by the present invention, the inlet end of the regenerative heat exchanger is connected to the first end of the outdoor electronic expansion valve through a one-way valve and a throttling component; the one-way valve is configured to allow only refrigerant flow to the recuperator.
As a preferable technical solution of the air conditioning unit provided in the present invention, the lubricating oil heat exchanger is disposed on an outer side wall of the bottom of the compressor in a wrapping manner.
Then, the invention also provides a control method of the air conditioning unit, wherein the air conditioning unit comprises a compressor, an indoor heat exchanger, an indoor electronic expansion valve, an outdoor electronic expansion valve and an outdoor heat exchanger, wherein the first end of the indoor heat exchanger is communicated with the first end of the indoor electronic expansion valve, the second end of the indoor electronic expansion valve is communicated with the first end of the outdoor electronic expansion valve, and the second end of the outdoor electronic expansion valve is communicated with the first end of the outdoor heat exchanger; a lubricating oil heat exchanger is arranged at the bottom of the compressor, and the inlet end of the lubricating oil heat exchanger is communicated with an exhaust port of the compressor; the external side wall of the compressor is provided with a regenerative heat exchanger which is used for regenerative heat exchangeThe outlet end of the device is communicated with the air suction port of the compressor; the control method comprises the following steps: determining the working mode of the air conditioning unit and acquiring the actual oil temperature value T of the lubricating oil in the oil pool at the bottom of the compressorOilAnd the actual refrigerant temperature value T at the outlet end of the lubricating oil heat exchangerGo outAnd an actual sidewall temperature value T of the compressor exterior sidewallSide wall(ii) a Will TOilAnd a set first oil temperature threshold value TOil device 1And a set second oil temperature threshold value TOil device 2Comparing and comparing TSide wallAnd TGo outComparing; and based on the comparison result, selectively communicating the outlet end of the lubricating oil heat exchanger with the second end of the indoor heat exchanger or the first end of the outdoor heat exchanger through a throttling device, and selectively communicating the inlet end of the regenerative heat exchanger with the first end of the outdoor electronic expansion valve or the outlet of the throttling device.
As a preferred aspect of the control method of the air conditioning unit according to the present invention, the step of selectively communicating the outlet end of the lube oil heat exchanger with the second end of the indoor heat exchanger or with the first end of the outdoor electronic expansion valve through a throttle device and selectively communicating the inlet end of the regenerative heat exchanger with the first end of the outdoor heat exchanger or with the outlet of the throttle device based on the comparison result includes: under the condition that the working mode of the air conditioning unit is heating: if TOil＜TOil device 1And TSide wall＞TGo outThen the outlet end of the lubricating oil heat exchanger is communicated with the inlet end of the regenerative heat exchanger through the throttling device; if TOil＜TOil device 1And TSide wall≤TGo outThen further obtaining the actual refrigerant temperature value T of the inlet end of the lubricating oil heat exchangerIntoAnd calculate TIntoAnd TGo outComparing the actual temperature difference with a preset first temperature difference threshold value; when the actual temperature difference value is larger than the first temperature difference threshold value, the outlet end of the lubricating oil heat exchanger passes through a throttling device and the oil inlet pipeThe first ends of the outdoor heat exchangers are communicated; when the actual temperature difference is smaller than or equal to the first temperature difference threshold value, communicating the outlet end of the lubricating oil heat exchanger with the second end of the indoor heat exchanger through a throttling device; if TOil≥TOil device 2The lube oil heat exchanger is blocked.
As a preferred aspect of the control method of the air conditioning unit according to the present invention, the step of selectively communicating the outlet end of the lube oil heat exchanger with the second end of the indoor heat exchanger or with the first end of the outdoor heat exchanger through a throttle device and selectively communicating the inlet end of the regenerative heat exchanger with the first end of the outdoor electronic expansion valve or with the outlet of the throttle device based on the comparison result includes: under the condition that the working mode of the air conditioning unit is heating: if T is satisfiedOil＜TOil device 1And TSide wall≤TGo outOr satisfy TOil＞TOil device 2Then, the actual refrigerant temperature value T of the first end of the electronic expansion valve is obtainedOuter coverAnd comparing TSide wallAnd TOuter coverThe size of (d); if TSide wall＞TOuter coverThen, the inlet end of the regenerative heat exchanger is communicated with the first end of the outdoor electronic expansion valve; if TSide wall≤TOuter coverAnd the regenerative heat exchanger is blocked.
As a preferred aspect of the control method of the air conditioning unit according to the present invention, the step of selectively communicating the outlet end of the lube oil heat exchanger with the second end of the indoor heat exchanger or with the first end of the outdoor heat exchanger through a throttle device and selectively communicating the inlet end of the regenerative heat exchanger with the first end of the outdoor electronic expansion valve or with the outlet of the throttle device based on the comparison result includes: under the condition that the working mode of the air conditioning unit is refrigeration: if TOil＜TOil device 1Communicating the outlet end of the lubricating oil heat exchanger with the first end of the outdoor heat exchanger through a throttling device; if TOil≥TOil device 2The lube oil heat exchanger is blocked.
As a preferable technical solution of the control method of the air conditioning unit provided by the present invention, the step of "determining the operation mode of the air conditioning unit" includes: acquiring an indoor actual temperature value; comparing the indoor actual temperature value with an indoor target temperature value set by a user; when the indoor actual temperature value is smaller than the indoor target temperature value, communicating a second end of the indoor heat exchanger with an exhaust port of the compressor, communicating a second end of the outdoor heat exchanger with a suction port of the compressor, and determining that the air conditioning unit enters a heating mode; and when the indoor actual temperature value is greater than the indoor target temperature value, communicating the second end of the outdoor heat exchanger with the exhaust port of the compressor, and communicating the second end of the indoor heat exchanger with the suction port of the compressor, so that the air conditioning unit is determined to enter a refrigeration mode.
In the air conditioning unit and the control method thereof provided by the invention, when the actual oil temperature value of the lubricating oil in the oil pool at the bottom of the compressor is smaller than the first oil temperature threshold value, the lubricating oil at the bottom of the compressor can be heated by starting the lubricating oil heat exchanger at the bottom of the compressor; when the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger is smaller than the actual side wall temperature value of the external side wall of the compressor, the outlet end of the lubricating oil heat exchanger can be communicated with the inlet end of the regenerative heat exchanger through a throttling device, and waste heat of the external side wall of the compressor is recovered through the regenerative heat exchanger; when the lubricating oil heat exchanger is not started or the actual refrigerant temperature value at the outlet end of the lubricating oil heat exchanger is greater than or equal to the actual side wall temperature value of the external side wall of the compressor, the inlet end of the regenerative heat exchanger can be communicated with the first end of the outdoor electronic expansion valve, and waste heat of the external side wall of the compressor is continuously recovered through the regenerative heat exchanger. Therefore, the heating of the lubricating oil at the bottom of the compressor can be realized, and the recovery of the waste heat of the outer side wall of the compressor can be realized, so that the refrigerating or heating effect of the compressor is improved, and the operating efficiency of the air conditioning unit is ensured.
In the air conditioning unit and the control method thereof provided by the invention, under the condition that the working mode of the air conditioning unit is heating, when the actual oil temperature value of lubricating oil in the bottom oil pool of the compressor is less than a first oil temperature threshold value and the actual side wall temperature value of the outer side wall of the compressor is less than or equal to the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger, the actual temperature difference value between the actual refrigerant temperature values of the inlet end of the lubricating oil heat exchanger and the outlet end of the lubricating oil heat exchanger is further calculated, when the actual temperature difference value is greater than a first temperature difference threshold value, the refrigerant is indicated to be fully released in the lubricating oil heat exchanger, and the outlet end of the lubricating oil heat exchanger is communicated with the first end of the outdoor electronic; when the actual temperature difference is smaller than or equal to the first temperature difference threshold value, the refrigerant is indicated to be insufficiently released in the lubricating oil heat exchanger, the outlet end of the lubricating oil heat exchanger is communicated with the second end of the indoor heat exchanger through the throttling device, and the heat of the refrigerant is further released through the indoor heat exchanger to heat the indoor space, so that the heat of the refrigerant is fully utilized.
Drawings
An air conditioning unit and a control method thereof of the present invention will be described below with reference to the accompanying drawings. In the drawings:
fig. 1 is a schematic diagram of a refrigerant flow path of the air conditioning unit in the heating state according to the present embodiment;
FIG. 2 is a schematic diagram of a refrigerant flow path of the air conditioning unit of the present embodiment in a cooling state;
fig. 3 is a schematic main flow chart of a control method of the air conditioning unit according to the present embodiment.
List of reference numerals
1-a compressor; 101-a first one-way valve;
11-lube oil heat exchanger; 111-a first capillary; 112-a first electronic expansion valve; 113-a second electronic expansion valve; 114-a third electronic expansion valve;
12-a recuperative heat exchanger; 121-a second capillary; 122-a fourth electronic expansion valve; 123-a second one-way valve;
2-an oil separator; 21-a third capillary;
a 3-four-way reversing valve; a first end of a d-four-way reversing valve; a second end of the e-four-way reversing valve; a third end of the s-four-way reversing valve; a fourth end of the c-four-way reversing valve;
4-indoor heat exchanger; 41-air pipe stop valve; 42-liquid pipe stop valve;
51-indoor electronic expansion valve; 52-outdoor electronic expansion valve;
6-a subcooler; 61-electronic expansion valve of subcooler;
7-a reservoir;
8-outdoor heat exchanger;
9-gas-liquid separator.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the four-way reversing valve is used to switch between the cooling and heating modes of the air conditioning unit in the drawings of the present embodiment, the implementation manner is not a constant one, and those skilled in the art can make adjustments as needed to suit specific applications without departing from the principles of the present invention. This function can also be achieved, for example, by two three-way reversing valves.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to solve the above problems in the prior art, that is, to solve the disadvantages that the electric heating method for increasing the oil temperature at the bottom of the compressor in the existing air conditioning unit has large power consumption, long heating time and is difficult to control the oil temperature of the lubricating oil, the present embodiment provides an air conditioning unit and a control method thereof.
[ first embodiment ] A method for manufacturing a semiconductor device
The air conditioning unit in the embodiment includes a compressor 1, an indoor heat exchanger 4, an indoor electronic expansion valve 51, an outdoor electronic expansion valve 52 and an outdoor heat exchanger 8; in a refrigerant circulation main path of the air conditioning unit, a first end of the indoor heat exchanger 4 is communicated with a first end of an indoor electronic expansion valve 51, a second end of the indoor electronic expansion valve 51 is communicated with a first end of an outdoor electronic expansion valve 52, and a second end of the outdoor electronic expansion valve 52 is communicated with a first end of an outdoor heat exchanger 8; one of the second end of the indoor heat exchanger 4 and the second end of the outdoor heat exchanger 8 is selectively communicated with the exhaust port of the compressor 1, and the other is communicated with the suction port of the compressor 1; the bottom of the compressor 1 is provided with a lubricating oil heat exchanger 11, the inlet end of the lubricating oil heat exchanger 11 is communicated with the exhaust port of the compressor 1, and the outlet end of the lubricating oil heat exchanger 11 is selectively communicated with the second end of the indoor heat exchanger 4 and the first end of the outdoor heat exchanger 8 through throttling devices (such as a first electronic expansion valve 112 and a third electronic expansion valve 114 in fig. 1 and 2).
Illustratively, the lubricant heat exchanger 11 may be wrapped on the outer side wall of the bottom of the compressor 1, and the lubricant heat exchanger 11 may be a micro-channel heat exchanger. That is, a sheet-like or plate-like heat exchanger may be wrapped outside the bottom of the compressor 1 to form the lubricating oil heat exchanger 11. In this embodiment, the lubricant heat exchanger 11 is always used as a condenser when it works, and a part of refrigerant flowing out of the exhaust port of the compressor 1 enters the lubricant heat exchanger 11 to condense and release heat, so as to heat lubricant in the oil sump at the bottom of the compressor 1.
The throttling means may comprise a first throttling element through which the outlet end of the lube oil heat exchanger 11 communicates with the second end of the indoor heat exchanger 4 and a second throttling element through which the outlet end of the lube oil heat exchanger 11 communicates with the first end of the outdoor heat exchanger 8; in fig. 1 and 2, the first throttling element is a first electronic expansion valve 112, the second throttling element is a third electronic expansion valve 114, or the first throttling element and the second throttling element may alternatively be capillary or thermal expansion valves.
As another embodiment of the above-described throttling device of the present embodiment, the outlet end of the lubricating oil heat exchanger 11 communicates with the inlet of a throttling device (the throttling device may be an electronic expansion valve or a capillary tube, for example), and the outlet of the throttling device selectively communicates with the second end of the indoor heat exchanger 4 and the first end of the outdoor heat exchanger 8 through valves (for example, on-off valves such as a plurality of solenoid valves). In addition, according to actual conditions, a first capillary tube 111 may be disposed between the refrigerant inlet of the lubricating oil heat exchanger 11 and the exhaust port of the compressor 1 to control the flow rate of the refrigerant entering the lubricating oil heat exchanger 11, so as to better heat the lubricating oil in the oil sump at the bottom of the compressor 1.
As shown in fig. 1, in the air conditioning unit of this embodiment, under the heating condition, the refrigerant flows out from the exhaust port of the compressor 1, sequentially passes through the indoor heat exchanger 4, the indoor electronic expansion valve 51, the outdoor electronic expansion valve 52 and the outdoor heat exchanger 8, and then enters the compressor 1 through the suction port of the compressor 1 to complete one refrigerant cycle, and during heating, the refrigerant flow rate in the refrigerant circulation loop is mainly adjusted by the outdoor electronic expansion valve 52. In the refrigerant circulation process, the refrigerant is used as a medium for transferring heat to transfer heat from the outdoor to the indoor, the indoor heat exchanger 4 is used as a condenser at the moment, and the refrigerant is condensed by the indoor heat exchanger 4 to release heat so as to heat the indoor; then, the outdoor heat exchanger 8 serves as an evaporator, and the refrigerant evaporates and absorbs heat through the outdoor heat exchanger 8 to absorb heat outdoors. The circulation realizes the heating of the indoor air. After the lubricating oil heat exchanger 11 is opened, if the temperature difference between the inlet and the outlet of the lubricating oil heat exchanger 11 is large, the heat loss of the refrigerant passing through the lubricating oil heat exchanger 11 is large, and the refrigerant at the outlet of the lubricating oil heat exchanger can be directly introduced into the outdoor heat exchanger 8 to participate in refrigerant circulation; if the temperature difference between the inlet and the outlet of the lubricating oil heat exchanger 11 is small, the heat loss of the refrigerant is small when the refrigerant passes through the lubricating oil heat exchanger 11, and the refrigerant at the outlet of the lubricating oil heat exchanger can be introduced into the indoor heat exchanger 4 to be continuously condensed and released, so that the heat of the refrigerant is fully utilized.
As shown in fig. 2, in the air conditioning unit of the present embodiment, under the cooling condition, the refrigerant flows out from the exhaust port of the compressor 1, passes through the outdoor heat exchanger 8, the outdoor electronic expansion valve 52, the indoor electronic expansion valve 51, and the indoor heat exchanger 4 in sequence, and then enters the compressor 1 through the suction port of the compressor 1 to complete one refrigerant cycle. In the refrigerant circulation process, the refrigerant is used as a medium for transferring heat to the outside from the inside of a room, the outdoor heat exchanger 8 is used as a condenser at the moment, and the refrigerant is condensed by the outdoor heat exchanger 8 to release heat; then, the indoor heat exchanger 4 is used as an evaporator, and the refrigerant is evaporated and absorbs heat through the indoor heat exchanger 4 to refrigerate the indoor space. The circulation realizes the cooling of the indoor air. After the lubricating oil heat exchanger 11 is opened, because the process that the lubricating oil heat exchanger 11 absorbs cold energy when heating the bottom of the compressor 1 can be considered, the refrigerant at the outlet of the lubricating oil heat exchanger can be throttled and led into the indoor heat exchanger 4 through the outdoor electronic expansion valve 52 and the indoor electronic expansion valve 51 to participate in refrigerant circulation, and the cold energy is released indoors. The refrigerant flow rate in the refrigerant circulation circuit is mainly adjusted by the indoor electronic expansion valve 51 during cooling.
In the air conditioning unit provided by the embodiment, the lubricating oil heat exchanger 11 is arranged at the bottom of the compressor 1, the inlet end of the lubricating oil heat exchanger 11 is communicated with the exhaust port of the compressor 1, and the outlet end of the lubricating oil heat exchanger 11 is selectively communicated with the second end of the indoor heat exchanger 4 and the first end of the outdoor heat exchanger 8 through a throttling device. Thus, when the lubricating oil in the oil pool at the bottom of the compressor 1 needs to be heated, the refrigerant flowing out of the exhaust port of the compressor 1 can pass through the lubricating oil heat exchanger 11, the lubricating oil heat exchanger 11 is used as a condenser to release heat to heat the lubricating oil at the bottom of the compressor 1, and the refrigerant flowing out of the lubricating oil heat exchanger 11 selectively enters the indoor heat exchanger 4 or the outdoor heat exchanger 8 according to the temperature value of the refrigerant at the outlet end of the refrigerant, so that the heat or the cold in the refrigerant flowing out of the lubricating oil heat exchanger 11 can be fully utilized.
As a preferred embodiment of the air conditioning unit provided in this embodiment, a recuperative heat exchanger 12 is disposed on an outer sidewall of the compressor 1; the inlet end of the recuperative heat exchanger 12 is selectively in communication with a first end of an outdoor electronic expansion valve or with an outlet of a throttling device, which may be a second electronic expansion valve 113; the outlet end of the recuperative heat exchanger 12 communicates with the suction port of the compressor 1.
Illustratively, the recuperative heat exchanger 12 may also be clad on the outer side wall of the compressor 1, and the recuperative heat exchanger 12 may also be a microchannel heat exchanger. That is, a plate-shaped or plate-shaped heat exchanger may be coated on an outer sidewall of the compressor 1 to form the recuperative heat exchanger 12. In this embodiment, the regenerative heat exchanger 12 is always used as an evaporator to absorb heat during its operation, and is turned on when the air conditioning unit is in heating operation and waste heat outside the compressor 1 needs to be recovered.
When the lubricating oil heat exchanger 11 and the regenerative heat exchanger 12 work simultaneously, the refrigerant flowing out of the lubricating oil heat exchanger 11 can be directly guided to the regenerative heat exchanger 12, so that the refrigerant is condensed in the lubricating oil heat exchanger 11 to release heat so as to heat the lubricating oil in the oil pool at the bottom of the compressor 1, and then is directly evaporated in the regenerative heat exchanger 12 to recycle the waste heat of the outer side wall of the compressor 1. When the lubricating oil heat exchanger 11 does not work, part of the refrigerant at the inlet of the outdoor heat exchanger 8 (i.e. the first end of the outdoor electronic expansion valve 52) can be guided to the regenerative heat exchanger 12 in a heating state, and the waste heat of the outer side wall of the compressor 1 can be recycled, so that the heating effect of the air conditioning unit is improved, and the utilization efficiency of the heat generated by the air conditioning unit is improved.
It can be understood that the recuperative heat exchanger 12 is mainly used to recover heat outside the compressor 1, and only when the air conditioning unit is in the heating mode, waste heat recovery is required; in the cooling mode, the air conditioning unit functions to transfer indoor heat to the outside of the room, and does not need to recover waste heat outside the compressor 1.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the inlet end of the regenerative heat exchanger 12 is connected to the first end of the outdoor electronic expansion valve 52 through a one-way valve (the one-way valve provided at the inlet end of the regenerative heat exchanger 12 in fig. 1 and 2 is the second one-way valve 123) and a throttle assembly; the check valve is configured to allow refrigerant flow only to the recuperator 12.
Illustratively, the throttle assembly includes a second capillary tube 121 and a fourth electronic expansion valve 122, and only one of the second capillary tube 121 and the fourth electronic expansion valve 122 may be provided. It will be appreciated that the throttling effect of the throttling assembly enables better heat absorption of the recuperator 12 with the inlet side of the recuperator 12 in communication with the first end of the inlet side outdoor electronic expansion valve 52.
As a preferred embodiment of the air conditioning unit provided in this embodiment, an exhaust port of the compressor 1 is connected to a first end d of a four-way reversing valve of the air conditioning unit, a second end of the indoor heat exchanger 4 is connected to a second end e of the four-way reversing valve, an air suction port of the compressor 1 is connected to a third end s of the four-way reversing valve, and a second end of the outdoor heat exchanger 8 is connected to a fourth end c of the four-way reversing valve; the four-way reversing valve 3 is set to conduct the third end and the fourth end when conducting the first end and the second end, at this time, the air conditioning unit enters a heating mode, and conduct the second end and the third end when conducting the first end and the fourth end, at this time, the air conditioning unit enters a cooling mode.
It can be understood that, although the air conditioning unit of the present embodiment is switched between the heating mode and the cooling mode by the four-way reversing valve 3. However, as another embodiment, the switching between the heating mode and the cooling mode of the air conditioning unit may also be implemented by two three-way reversing valves, for example, a first end of a first three-way reversing valve is connected to the exhaust port of the compressor 1, and a second end and a third end of the first three-way reversing valve are respectively connected to a second end of the indoor heat exchanger 4 and a second end of the outdoor heat exchanger 8; meanwhile, the first end of the second three-way reversing valve is connected to the air suction port of the compressor 1, and the second end and the third end of the second three-way reversing valve are respectively connected to the second end of the indoor heat exchanger 4 and the second end of the outdoor heat exchanger 8.
Thus, by controlling the first three-way reversing valve and the second three-way reversing valve, when the refrigerant flows out from the outlet of the compressor 1, passes through the indoor heat exchanger 4 and then passes through the outdoor heat exchanger 8, the air conditioning unit is in the heating mode; when the refrigerant flows out from the outlet of the compressor 1, passes through the outdoor heat exchanger 8 and then passes through the indoor heat exchanger 4, the air conditioning unit is in a refrigeration mode.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the gas-liquid separator 9 of the air conditioning unit is connected between the suction port of the compressor 1 and the third end s of the four-way reversing valve, the inlet of the gas-liquid separator 9 is connected to the third end s of the four-way reversing valve, and the outlet of the gas-liquid separator 9 is connected to the suction port of the compressor 1; the outlet end of the recuperative heat exchanger 12 is connected to the inlet of the gas-liquid separator 9 to communicate with the suction port of the compressor 1 through the gas-liquid separator 9.
Thus, by arranging the gas-liquid separator 9, the refrigerant entering the compressor 1 can be ensured to be all in a gaseous state, so that the problem that the compressor 1 is damaged due to liquid impact caused by the fact that the liquid refrigerant enters the compressor 1 is solved.
As a preferred embodiment of the air conditioning unit provided in this embodiment, a subcooler of the air conditioning unit is connected between the second end of the indoor electronic expansion valve 51 and the first end of the outdoor electronic expansion valve 52, and the subcooler 6 includes a first heat exchange channel and a second heat exchange channel that exchange heat with each other; the first end of the first heat exchange channel is connected with the second end of the indoor electronic expansion valve 51, the second end of the first heat exchange channel is respectively connected with the first end of the outdoor electronic expansion valve 52 and the first end of the second heat exchange channel, and a subcooler electronic expansion valve 61 is connected between the second end of the first heat exchange channel and the first end of the second heat exchange channel; the second end of the second heat exchange channel is connected to the inlet of the gas-liquid separator 9.
Thus, when the air conditioner is refrigerating, the refrigerant is divided into two paths after flowing out of the outdoor heat exchanger 8, one path enters the first heat exchange channel (the lower channel of the subcooler 6 in the figures 1 and 2 is set as a cooled cavity), and the other path enters the second heat exchange channel (the upper channel of the subcooler 6 in the figures 1 and 2 is set as a cooling cavity).
In a preferred embodiment of the air conditioning unit provided in this embodiment, the reservoir 7 of the air conditioning unit is connected between the second end of the first heat exchange channel and the first end of the outdoor electronic expansion valve 52. Therefore, the quantity of the refrigerant participating in the circulation can be adjusted through the liquid accumulator 7, and redundant refrigerant is stored in the liquid accumulator to ensure the heating or refrigerating effect of the air conditioning unit.
As a preferred embodiment of the air conditioning unit according to the present embodiment, the exhaust port of the compressor 1 communicates with the first end d of the four-way selector valve via the oil separator 2 of the air conditioning unit, and the oil discharge port of the oil separator 2 is connected to the air intake port of the compressor 1. Therefore, the lubricating oil brought out from the air outlet of the compressor 1 by the refrigerant can flow back to the compressor 1 through the oil separator 2, so that the problems of lubricating oil loss in the compressor 1, blockage of refrigerant channels of other devices in the air conditioning unit and the like are avoided.
Optionally, a third capillary tube 21 may be disposed between the oil discharge port of the oil separator 2 and the air suction port of the compressor 1, and when the refrigerant brings the lubricating oil to the air suction port of the compressor 1, the flow rate of the refrigerant in the section of the pipeline is controlled, so as to control the flow rate of the return oil.
Optionally, a first check valve 101 may be disposed between the oil separator 2 and the first end d of the four-way reversing valve, and the first check valve 101 is configured to allow only the refrigerant to flow from the exhaust port of the compressor 1 to the first end d of the four-way reversing valve, so as to prevent the refrigerant from flowing back to the compressor 1 when the compressor is stopped or otherwise, and causing a failure of the compressor 1.
Meanwhile, in order to control the flow of the refrigerant on a refrigerant circulation line of the air conditioning unit when the compressor is started and stopped, an air pipe stop valve 41 is arranged between the second end e of the four-way reversing valve and the indoor heat exchanger 4; and a liquid pipe shutoff valve 42 is provided between the indoor electronic expansion valve 51 and the subcooler 6. When the air conditioning unit is started, the air pipe stop valve 41 and the liquid pipe stop valve 42 are opened, and then the compressor is started; when the air conditioner set stops, the compressor is closed, and then the air pipe stop valve 41 and the liquid pipe stop valve 42 are closed.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
[ second embodiment ]
As shown in fig. 1 to 3, the air conditioning unit provided in this embodiment includes a compressor 1, an indoor heat exchanger 4, an indoor electronic expansion valve 51, an outdoor electronic expansion valve 52 and an outdoor heat exchanger 8, wherein a first end of the indoor heat exchanger 4 is communicated with a first end of the indoor electronic expansion valve 51, a second end of the indoor electronic expansion valve 51 is communicated with a first end of the outdoor electronic expansion valve 52, and a second end of the outdoor electronic expansion valve 52 is communicated with a first end of the outdoor heat exchanger 8; the bottom of the compressor 1 is provided with a lubricating oil heat exchanger 11, and the inlet end of the lubricating oil heat exchanger 11 is communicated with the exhaust port of the compressor 1; a regenerative heat exchanger 12 is arranged on the outer side wall of the compressor 1, and the outlet end of the regenerative heat exchanger 12 is communicated with the air suction port of the compressor 1; the air conditioning unit also comprises a control unit (not shown in the figures); the control unit can selectively communicate one of the second end of the indoor heat exchanger 4 and the second end of the outdoor heat exchanger 8 with the exhaust port of the compressor 1 and communicate the other with the suction port of the compressor 1 according to the indoor actual temperature value and the indoor target temperature value set by a user so as to control the air conditioning unit to enter a refrigerating or heating working mode; the control unit can also selectively communicate the outlet end of the lubricating oil heat exchanger 11 with the second end of the indoor heat exchanger 4 or with the first end of the outdoor heat exchanger 8 through a throttling device and selectively communicate the inlet end of the regenerative heat exchanger 12 with the first end of the outdoor electronic expansion valve 52 or with the outlet of the throttling device according to the working mode of the air conditioning unit, the actual oil temperature value of the lubricating oil in the bottom oil pool of the compressor 1, the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger 11 and the actual side wall temperature value of the external side wall of the compressor 1.
For example, in practical applications, the control unit of the air conditioning unit in the above embodiment may complete the above function units by different function units according to needs, that is, the function units in this embodiment are further decomposed or combined, for example, the function units in the above embodiment may be further split into a plurality of sub-units to complete all or part of the above described functions. It should be noted that, please refer to "the third embodiment" for the above specific implementation method of the control unit, which is not described herein again.
In the air conditioning unit provided in this embodiment, when the actual oil temperature value of the lubricating oil in the oil sump at the bottom of the compressor 1 is smaller than the first oil temperature threshold value, the lubricating oil at the bottom of the compressor 1 may be heated by starting the lubricating oil heat exchanger 11 at the bottom of the compressor 1; when the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger 11 is smaller than the actual side wall temperature value of the external side wall of the compressor 1, the outlet end of the lubricating oil heat exchanger 11 can be communicated with the inlet end of the regenerative heat exchanger 12 through a throttling device, and the waste heat of the external side wall of the compressor 1 is recovered through the regenerative heat exchanger 12; when the lubricating oil heat exchanger 11 is not opened or the actual temperature value of the refrigerant at the outlet end of the lubricating oil heat exchanger is greater than or equal to the actual temperature value of the side wall of the compressor 1, the inlet end of the regenerative heat exchanger 12 can be communicated with the first end of the electronic expansion valve 52, and the waste heat at the side wall of the compressor 1 can be continuously recovered through the regenerative heat exchanger 12. Therefore, the lubricating oil at the bottom of the compressor 1 can be heated, and the waste heat of the outer side wall of the compressor 1 can be recovered, so that the refrigerating or heating effect of the compressor 1 is improved, and the operating efficiency of the air conditioning unit is ensured.
As a preferred implementation manner of the air conditioning unit provided in this embodiment, the throttling device includes a first throttling element, a second throttling element, and a third throttling element; the outlet end of the lubricating oil heat exchanger 11 is communicated with the second end of the indoor heat exchanger 4 through a first throttling element, the outlet end of the lubricating oil heat exchanger 11 is communicated with the first end of the outdoor heat exchanger 8 through a second throttling element, and the outlet end of the lubricating oil heat exchanger 11 is communicated with the inlet end of the regenerative heat exchanger 12 through a third throttling element; the control unit is in communication with the first, second and third throttling elements; the control unit selectively communicates the outlet end of the lube oil heat exchanger 11 with the second end of the indoor heat exchanger 4 or with the first end of the outdoor heat exchanger 8 through a throttling device and selectively communicates the inlet end of the recuperative heat exchanger 12 with the first end of the outdoor electronic expansion valve 52 or with the outlet of the throttling device by controlling the first, second and third throttling elements.
It should be noted that, please refer to "the third embodiment" for the above specific implementation method of the control unit, which is not described herein again.
As a preferred embodiment of the air conditioning unit provided in this embodiment, an exhaust port of the compressor 1 is connected to a first end d of a four-way reversing valve of the air conditioning unit, a second end of the indoor heat exchanger 4 is connected to a second end e of the four-way reversing valve, an air suction port of the compressor 1 is connected to a third end s of the four-way reversing valve, and a second end of the outdoor heat exchanger 8 is connected to a fourth end c of the four-way reversing valve; the four-way reversing valve 3 is in communication connection with the control unit; the control unit conducts the first end and the second end of the four-way reversing valve 3 and conducts the third end and the fourth end of the four-way reversing valve to control the air conditioning unit to enter a heating working mode; the control unit controls the four-way reversing valve 3 to conduct the first end and the fourth end of the four-way reversing valve and conduct the second end and the third end of the four-way reversing valve, so that the air conditioning unit is controlled to enter a refrigeration working mode.
It should be noted that, please refer to "the third embodiment" for the above specific implementation method of the control unit, which is not described herein again.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the inlet end of the recuperative heat exchanger 12 is connected to the first end of the outdoor electronic expansion valve 52 through a one-way valve and a throttle assembly; the check valve is configured to allow refrigerant flow only to the recuperator 12.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the lubricating oil heat exchanger 11 is disposed on the outer side wall of the bottom of the compressor 1 in a wrapping manner.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
[ third embodiment ]
As shown in fig. 1 to 3, the present embodiment further provides a control method of an air conditioning unit, the air conditioning unit includes a compressor 1, an indoor heat exchanger 4, an indoor electronic expansion valve 51, an outdoor electronic expansion valve 51, and an outdoor heat exchanger 8, a first end of the indoor heat exchanger 4 is communicated with a first end of the indoor electronic expansion valve 51, a second end of the indoor electronic expansion valve 51 is communicated with a first end of the outdoor electronic expansion valve 52, and a second end of the outdoor electronic expansion valve 52 is communicated with a first end of the outdoor heat exchanger 8; the bottom of the compressor 1 is provided with a lubricating oil heat exchanger 11, and the inlet end of the lubricating oil heat exchanger 11 is communicated with the exhaust port of the compressor 1; a regenerative heat exchanger 12 is arranged on the outer side wall of the compressor 1, and the outlet end of the regenerative heat exchanger 12 is communicated with the air suction port of the compressor 1; the control method comprises the following steps:
s1, determining the working mode of the air conditioning unit and obtaining the actual oil temperature value T of the lubricating oil in the oil pool at the bottom of the compressor 1OilActual refrigerant temperature value T at outlet end of lubricating oil heat exchanger 11Go outAnd the actual sidewall temperature value T of the outer sidewall of the compressor 1Side wall；
S2, mixing TOilAnd a set first oil temperature threshold value TOil device 1And a set second oil temperature threshold value TOil device 2Comparing and comparing TSide wallAnd TGo outComparing;
s3, based on the comparison result, the outlet end of the lube oil heat exchanger 11 is selectively communicated with the second end of the indoor heat exchanger 4 or the first end of the outdoor heat exchanger 8 through the throttle device, and the inlet end of the recuperative heat exchanger 12 is selectively communicated with the first end of the outdoor electronic expansion valve 52 or the outlet of the throttle device.
As a preferred embodiment of the control method of the air conditioning unit provided in the present embodiment, the step of "selectively communicating the outlet end of the lubricating oil heat exchanger 11 with the second end of the indoor heat exchanger 4 or with the first end of the outdoor heat exchanger 8 through the throttling device and selectively communicating the inlet end of the regenerative heat exchanger 12 with the first end of the outdoor electronic expansion valve 52 or with the outlet of the throttling device based on the result of the comparison" in step S3 includes: under the condition that the working mode of the air conditioning unit is heating:
if TOil＜TOil device 1And TSide wall＞TGo outThen, the outlet end of the lubricating oil heat exchanger 11 is communicated with the inlet end of the regenerative heat exchanger 12 through a throttling device;
it can be understood that, in this embodiment, when the actual oil temperature value of the lubricating oil in the oil sump at the bottom of the compressor 1 is less than the first oil temperature threshold value, the lubricating oil at the bottom of the compressor 1 can be heated by turning on the lubricating oil heat exchanger 11 at the bottom of the compressor 1; when the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger 11 is smaller than the actual sidewall temperature value of the external sidewall of the compressor 1, the outlet end of the lubricating oil heat exchanger 11 can be conducted with the inlet end of the regenerative heat exchanger 12 through the throttling device, and the waste heat of the external sidewall of the compressor 1 is recovered through the regenerative heat exchanger 12.
If TOil＜TOil device 1And TSide wall≤TGo outThen further obtain the actual refrigerant temperature value T of the inlet end of the lubricating oil heat exchanger 11IntoAnd calculate TIntoAnd TGo outComparing the actual temperature difference with a preset first temperature difference threshold value; when the actual temperature difference is larger than the first temperature difference threshold value, the outlet end of the lubricating oil heat exchanger 11 is communicated with the first end of the outdoor heat exchanger 8 through a throttling device; when the actual temperature difference is smaller than or equal to the first temperature difference threshold value, the outlet end of the lubricating oil heat exchanger 11 is communicated with the second end of the indoor heat exchanger 4 through a throttling device; if TOil≥TOil device 2The lube oil heat exchanger 11 is blocked.
It can be understood that, under the condition that the operating mode of the air conditioning unit is heating, when the actual oil temperature value of the lubricating oil in the oil sump at the bottom of the compressor 1 is less than the first oil temperature threshold value and the actual sidewall temperature value of the external sidewall of the compressor 1 is less than or equal to the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger 11, the actual temperature difference between the actual refrigerant temperature values of the inlet end of the lubricating oil heat exchanger 11 and the outlet end of the lubricating oil heat exchanger 11 is further calculated, and when the actual temperature difference is greater than the first temperature difference threshold value, it is indicated that the refrigerant has performed sufficient heat release in the lubricating oil heat exchanger 11, the outlet end of the lubricating oil heat exchanger 11 is communicated with the first end of the; when the actual temperature difference is smaller than or equal to the first temperature difference threshold value, it is indicated that the refrigerant does not fully release heat in the lubricating oil heat exchanger 11, the outlet end of the lubricating oil heat exchanger 11 is communicated with the second end of the indoor heat exchanger 4 through the throttling device, and the heat of the refrigerant is further released through the indoor heat exchanger 4 to heat the indoor space, so that the heat of the refrigerant is fully utilized.
As a preferred embodiment of the control method of the air conditioning unit provided in the present embodiment, the step of "selectively communicating the outlet end of the lubricating oil heat exchanger 11 with the second end of the indoor heat exchanger 4 or with the first end of the outdoor heat exchanger 8 through the throttling device and selectively communicating the inlet end of the regenerative heat exchanger 12 with the first end of the outdoor electronic expansion valve 52 or with the outlet of the throttling device based on the result of the comparison" in step S3 includes: under the condition that the working mode of the air conditioning unit is heating: if T is satisfiedOil＜TOil device 1And TSide wall≤TGo outOr satisfy TOil＞TOil device 2Then, the actual refrigerant temperature value T of the first end of the outdoor electronic expansion valve 52 is obtainedOuter coverAnd comparing TSide wallAnd TOuter coverThe size of (d); if TSide wall＞TOuter coverThen the inlet end of the recuperative heat exchanger 12 is communicated with the first end of the outdoor electronic expansion valve 52; if TSide wall≤TOuter coverThe recuperative heat exchanger 12 is blocked.
It will be appreciated that when T is satisfiedOil＞TOil device 2When the lubricating oil heat exchanger 11 is not started; or the actual refrigerant temperature value at the outlet end of the lubricating oil heat exchanger is largeWhen the temperature is equal to or higher than the actual sidewall temperature value of the outer sidewall of the compressor 1, the inlet end of the regenerative heat exchanger 12 may be communicated with the first end of the outdoor electronic expansion valve 52, and the waste heat of the outer sidewall of the compressor 1 is continuously recovered by the regenerative heat exchanger 12. Therefore, the lubricating oil at the bottom of the compressor 1 can be heated, and the waste heat of the outer side wall of the compressor 1 can be recovered, so that the refrigerating or heating effect of the compressor 1 is improved, and the operating efficiency of the air conditioning unit is ensured.
As a preferred embodiment of the control method of the air conditioning unit provided in the present embodiment, the step of "selectively communicating the outlet end of the lubricating oil heat exchanger 11 with the second end of the indoor heat exchanger 4 or with the first end of the outdoor heat exchanger 8 through the throttling device and selectively communicating the inlet end of the regenerative heat exchanger 12 with the first end of the outdoor electronic expansion valve 52 or with the outlet of the throttling device based on the result of the comparison" in step S3 includes: under the condition that the working mode of the air conditioning unit is refrigeration: if TOil＜TOil device 1Then the outlet end of the lubricating oil heat exchanger 11 is communicated with the first end of the outdoor heat exchanger 8 through a throttling device; if TOil≥TOil device 2The lube oil heat exchanger 11 is blocked.
It can be understood that, under the condition that the operation mode of the air conditioning unit is refrigeration, the regenerative heat exchanger 12 does not need to be started all the time, but the lubricating oil heat exchanger 11 always functions as a condenser, and at this time, the refrigerant flowing out of the outlet end of the opened opening of the lubricating oil heat exchanger 11 can pass through the throttling device and the first end of the outdoor heat exchanger 8, that is, then enters the indoor heat exchanger 4 to exert the ability of evaporation and heat absorption.
In the control method of the air conditioning unit provided in this embodiment, when the actual oil temperature value of the lubricating oil in the oil sump at the bottom of the compressor 1 is smaller than the first oil temperature threshold value, the lubricating oil at the bottom of the compressor 1 may be heated by starting the lubricating oil heat exchanger 11 at the bottom of the compressor 1; when the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger 11 is smaller than the actual side wall temperature value of the external side wall of the compressor 1, the outlet end of the lubricating oil heat exchanger 11 can be communicated with the inlet end of the regenerative heat exchanger 12 through a throttling device, and the waste heat of the external side wall of the compressor 1 is recovered through the regenerative heat exchanger 12; when the lubricating oil heat exchanger 11 is not opened or the actual temperature value of the refrigerant at the outlet end of the lubricating oil heat exchanger is greater than or equal to the actual temperature value of the side wall of the compressor 1, the inlet end of the regenerative heat exchanger 12 may be communicated with the first end of the outdoor electronic expansion valve 52, and the waste heat at the side wall of the compressor 1 is continuously recovered through the regenerative heat exchanger 12. Therefore, the lubricating oil at the bottom of the compressor 1 can be heated, and the waste heat of the outer side wall of the compressor 1 can be recovered, so that the refrigerating or heating effect of the compressor 1 is improved, and the operating efficiency of the air conditioning unit is ensured.
In the control method of the air conditioning unit provided in this embodiment, under the condition that the operating mode of the air conditioning unit is heating, when the actual oil temperature value of the lubricating oil in the oil sump at the bottom of the compressor 1 is less than the first oil temperature threshold value and the actual sidewall temperature value of the external sidewall of the compressor 1 is less than or equal to the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger 11, further calculating an actual temperature difference value between the actual refrigerant temperature values of the inlet end of the lubricating oil heat exchanger 11 and the outlet end of the lubricating oil heat exchanger 11, and when the actual temperature difference value is greater than the first temperature difference threshold value, indicating that the refrigerant has performed sufficient heat release in the lubricating oil heat exchanger 11, communicating the outlet end of the lubricating oil heat exchanger 11 with the first end of the; when the actual temperature difference is smaller than or equal to the first temperature difference threshold value, it is indicated that the refrigerant does not fully release heat in the lubricating oil heat exchanger 11, the outlet end of the lubricating oil heat exchanger 11 is communicated with the second end of the indoor heat exchanger 4 through the throttling device, and the heat of the refrigerant is further released through the indoor heat exchanger 4 to heat the indoor space, so that the heat of the refrigerant is fully utilized.
As a preferred implementation of the control method for the air conditioning unit provided in this embodiment, the step of "determining the operation mode of the air conditioning unit" in step S1 includes: acquiring an indoor actual temperature value; comparing the indoor actual temperature value with an indoor target temperature value set by a user; when the indoor actual temperature value is smaller than the indoor target temperature value, communicating the second end of the indoor heat exchanger 4 with the exhaust port of the compressor 1, and communicating the second end of the outdoor heat exchanger 8 with the suction port of the compressor 1, determining that the air conditioning unit enters a heating mode; and when the indoor actual temperature value is greater than the indoor target temperature value, communicating the second end of the outdoor heat exchanger 8 with the exhaust port of the compressor 1, and communicating the second end of the indoor heat exchanger 4 with the suction port of the compressor 1, so that the air conditioning unit is determined to enter a refrigeration mode.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
It should be noted that although the detailed steps of the control method of the air conditioning unit in the present embodiment are described in detail above, those skilled in the art may combine, separate and change the order of the above steps without departing from the basic principle of the present embodiment, and the modified technical solution does not change the basic concept of the present embodiment, and therefore, falls within the scope of the description of the present embodiment.
For example, in the present embodiment, the actual refrigerant temperature value T at the inlet end of the lube oil heat exchangerIntoAnd the actual refrigerant temperature value T of the first end of the outdoor heat exchangerOuter coverIt may be performed in step S1, or may be performed in step S2 or after step S2.
The present embodiments may also be embodied as apparatus or device programs (e.g., PC programs and PC program products) for performing a portion or all of the methods described herein. Such a program implementing the present embodiment may be stored on a PC readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. An air conditioning unit is characterized by comprising a compressor, an indoor heat exchanger, an indoor electronic expansion valve, an outdoor electronic expansion valve and an outdoor heat exchanger, wherein a first end of the indoor heat exchanger is communicated with a first end of the indoor electronic expansion valve; a lubricating oil heat exchanger is arranged at the bottom of the compressor, and the inlet end of the lubricating oil heat exchanger is communicated with an exhaust port of the compressor;
a regenerative heat exchanger is arranged on the outer side wall of the compressor, and the outlet end of the regenerative heat exchanger is communicated with the air suction port of the compressor;
the air conditioning unit further comprises a control unit;
the control unit can selectively communicate one of the second end of the indoor heat exchanger and the second end of the outdoor heat exchanger with the exhaust port of the compressor and communicate the other with the suction port of the compressor according to the indoor actual temperature value and the indoor target temperature value set by a user so as to control the air conditioning unit to enter a refrigerating or heating working mode;
the control unit can also selectively communicate the outlet end of the lubricating oil heat exchanger with the second end of the indoor heat exchanger or with the first end of the outdoor heat exchanger through a throttling device and selectively communicate the inlet end of the regenerative heat exchanger with the first end of the outdoor electronic expansion valve or with the outlet of the throttling device according to the working mode of the air conditioning unit, the actual oil temperature value of the lubricating oil in the oil pool at the bottom of the compressor, the actual refrigerant temperature value of the outlet end of the lubricating oil heat exchanger and the actual side wall temperature value of the outer side wall of the compressor.
2. Air conditioning assembly according to claim 1, characterized in that said throttling means comprise a first, a second and a third throttling element;
the outlet end of the lubricating oil heat exchanger is communicated with the second end of the indoor heat exchanger through the first throttling element, the outlet end of the lubricating oil heat exchanger is communicated with the first end of the outdoor heat exchanger through the second throttling element, and the outlet end of the lubricating oil heat exchanger is communicated with the inlet end of the regenerative heat exchanger through the third throttling element;
the control unit is in communication connection with the first, second and third throttling elements;
the control unit controls the first throttling element, the second throttling element and the third throttling element to selectively communicate the outlet end of the lubricating oil heat exchanger with the second end of the indoor heat exchanger or the first end of the outdoor heat exchanger through a throttling device, and selectively communicate the inlet end of the regenerative heat exchanger with the first end of the outdoor electronic expansion valve or the outlet of the throttling device.
3. The air conditioning unit according to claim 1, wherein the compressor has an exhaust port connected to a first end of a four-way reversing valve of the air conditioning unit, the indoor heat exchanger has a second end connected to a second end of the four-way reversing valve, the compressor has an intake port connected to a third end of the four-way reversing valve, and the outdoor heat exchanger has a second end connected to a fourth end of the four-way reversing valve;
the four-way reversing valve is in communication connection with the control unit;
the control unit controls the four-way reversing valve to conduct the first end and the second end of the four-way reversing valve and conduct the third end and the fourth end of the four-way reversing valve so as to control the air conditioning unit to enter a heating working mode;
and the control unit controls the four-way reversing valve to conduct the first end and the fourth end and conduct the second end and the third end of the four-way reversing valve so as to control the air conditioning unit to enter a refrigeration working mode.
4. The air conditioning unit as set forth in claim 1, wherein said inlet end of said recuperator is connected to said first end of said outdoor electronic expansion valve through a one-way valve and a throttle assembly;
the one-way valve is configured to allow only refrigerant flow to the recuperator.
5. The air conditioning assembly as set forth in claim 1 wherein said lube oil heat exchanger is clad on an outer sidewall of said compressor base.
6. The control method of the air conditioning unit is characterized in that the air conditioning unit comprises a compressor, an indoor heat exchanger, an indoor electronic expansion valve, an outdoor electronic expansion valve and an outdoor heat exchanger, wherein a first end of the indoor heat exchanger is communicated with a first end of the indoor electronic expansion valve, a second end of the indoor electronic expansion valve is communicated with a first end of the outdoor electronic expansion valve, and a second end of the outdoor electronic expansion valve is communicated with a first end of the outdoor heat exchanger; a lubricating oil heat exchanger is arranged at the bottom of the compressor, and the inlet end of the lubricating oil heat exchanger is communicated with an exhaust port of the compressor; a regenerative heat exchanger is arranged on the outer side wall of the compressor, and the outlet end of the regenerative heat exchanger is communicated with the air suction port of the compressor; the control method comprises the following steps:
determining the working mode of the air conditioning unit and obtaining the working modeActual oil temperature value T of lubricating oil in oil sump at bottom of compressorOilAnd the actual refrigerant temperature value T at the outlet end of the lubricating oil heat exchangerGo outAnd an actual sidewall temperature value T of the compressor exterior sidewallSide wall；
Will TOilAnd a set first oil temperature threshold value TOil device 1And a set second oil temperature threshold value TOil device 2Comparing and comparing TSide wallAnd TGo outComparing;
and based on the comparison result, selectively communicating the outlet end of the lubricating oil heat exchanger with the second end of the indoor heat exchanger or the first end of the outdoor heat exchanger through a throttling device, and selectively communicating the inlet end of the regenerative heat exchanger with the first end of the outdoor electronic expansion valve or the outlet of the throttling device.
7. The control method of claim 6, wherein the step of selectively communicating the outlet end of the lube oil heat exchanger with the second end of the indoor heat exchanger or with the first end of the outdoor heat exchanger through a throttle device and selectively communicating the inlet end of the recuperator with the first end of the outdoor electronic expansion valve or with the outlet of the throttle device based on the result of the comparison comprises:
under the condition that the working mode of the air conditioning unit is heating:
if TOil＜TOil device 1And TSide wall＞TGo outThen the outlet end of the lubricating oil heat exchanger is communicated with the inlet end of the regenerative heat exchanger through the throttling device;
if TOil＜TOil device 1And TSide wall≤TGo outThen further obtaining the actual refrigerant temperature value T of the inlet end of the lubricating oil heat exchangerIntoAnd calculate TIntoAnd TGo outComparing the actual temperature difference with a preset first temperature difference threshold value; when the actual temperature difference value is larger than the first temperature difference threshold value, thenCommunicating the outlet end of the lubricating oil heat exchanger with the first end of the outdoor heat exchanger through a throttling device; when the actual temperature difference is smaller than or equal to the first temperature difference threshold value, communicating the outlet end of the lubricating oil heat exchanger with the second end of the indoor heat exchanger through a throttling device;
if TOil≥TOil device 2The lube oil heat exchanger is blocked.
8. The control method of claim 6, wherein the step of selectively communicating the outlet end of the lube oil heat exchanger with the second end of the indoor heat exchanger or with the first end of the outdoor heat exchanger through a throttle device and selectively communicating the inlet end of the recuperator with the first end of the outdoor electronic expansion valve or with the outlet of the throttle device based on the result of the comparison comprises:
under the condition that the working mode of the air conditioning unit is heating:
if T is satisfiedOil＜TOil device 1And TSide wall≤TGo outOr satisfy TOil＞TOil device 2Then, the actual refrigerant temperature value T of the first end of the outdoor electronic expansion valve is obtainedOuter coverAnd comparing TSide wallAnd TOuter coverThe size of (d);
if TSide wall＞TOuter coverThen, the inlet end of the regenerative heat exchanger is communicated with the first end of the outdoor electronic expansion valve; if TSide wall≤TOuter coverAnd the regenerative heat exchanger is blocked.
9. The control method of claim 6, wherein the step of selectively communicating the outlet end of the lube oil heat exchanger with the second end of the indoor heat exchanger or with the first end of the outdoor heat exchanger through a throttle device and selectively communicating the inlet end of the recuperator with the first end of the outdoor electronic expansion valve or with the outlet of the throttle device based on the result of the comparison comprises:
under the condition that the working mode of the air conditioning unit is refrigeration:
if TOil＜TOil device 1Communicating the outlet end of the lubricating oil heat exchanger with the first end of the outdoor heat exchanger through a throttling device;
if TOil≥TOil device 2The lube oil heat exchanger is blocked.
10. The control method according to claim 6, wherein the step of determining the operation mode of the air conditioning unit comprises:
acquiring an indoor actual temperature value;
comparing the indoor actual temperature value with an indoor target temperature value set by a user;
when the indoor actual temperature value is smaller than the indoor target temperature value, communicating a second end of the indoor heat exchanger with an exhaust port of the compressor, communicating a second end of the outdoor heat exchanger with a suction port of the compressor, and determining that the air conditioning unit enters a heating mode;
and when the indoor actual temperature value is greater than the indoor target temperature value, communicating the second end of the outdoor heat exchanger with the exhaust port of the compressor, and communicating the second end of the indoor heat exchanger with the suction port of the compressor, so that the air conditioning unit is determined to enter a refrigeration mode.
CN202010878395.0A 2020-08-27 2020-08-27 Air conditioning unit and control method thereof Active CN112032826B (en)

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