CN111811112A - Intelligent oil return multi-split air conditioner system - Google Patents

Intelligent oil return multi-split air conditioner system Download PDF

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Publication number
CN111811112A
CN111811112A CN202010667568.4A CN202010667568A CN111811112A CN 111811112 A CN111811112 A CN 111811112A CN 202010667568 A CN202010667568 A CN 202010667568A CN 111811112 A CN111811112 A CN 111811112A
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China
Prior art keywords
oil return
separator
return pipe
compressor
oil
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Granted
Application number
CN202010667568.4A
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Chinese (zh)
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CN111811112B (en
Inventor
陈昌瑞
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Nanjing TICA Climate Solutions Co Ltd
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Nanjing TICA Climate Solutions Co Ltd
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Publication of CN111811112A publication Critical patent/CN111811112A/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
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • 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
    • 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
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • 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
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication

Abstract

The invention relates to an intelligent oil return multi-split system which comprises a refrigerant circulating loop, a refrigerant circulating loop and a refrigerant circulating loop, wherein the refrigerant circulating loop is formed by sequentially connecting a compressor, an oil separator, a four-way valve, an outdoor machine heat exchanger, an indoor machine heat exchanger and a gas-liquid separator; the oil return device also comprises a main oil return pipe and an auxiliary oil return pipe; two ends of the main oil return pipe are respectively connected with the bottom of the oil separator and the inlet of the gas-liquid separator; one end of the auxiliary oil return pipe is communicated with the side wall of the oil separator through a capillary tube I, and the other end of the auxiliary oil return pipe is connected to an air suction port of the compressor; a temperature sensor I is arranged on an exhaust pipe of the compressor; and a temperature sensor II is arranged on the auxiliary oil return pipe. The intelligent oil return device has reasonable design and obvious effect, can intelligently judge whether the compressor is lack of oil or not, and timely enters oil return operation, thereby not only ensuring the normal operation of the system, but also saving electric power, reducing the use cost and meeting the market demand.

Description

Intelligent oil return multi-split air conditioner system
Technical Field
The invention relates to an air conditioning system, in particular to a multi-split system, and particularly relates to an intelligent oil return multi-split system.
Background
Compressor oil is an indispensable substance for ensuring the normal operation of the compressor. The lubricating oil is mutually soluble with the refrigerant, so the lubricating oil flows in the air conditioning system along with the refrigerant.
Because the multi-connected unit has the characteristics of long pipeline and more indoor units, the lubricating oil can be gradually attached to the pipeline or the heat exchanger of the air conditioner in the flowing process of the refrigerant. As the air conditioning operation time increases, less and less oil is returned to the compressor, and therefore, it is necessary to return the oil to the compressor by increasing the refrigerant flow rate by increasing the compressor rotation speed. The higher the frequency of the oil return operation is, the worse the energy saving performance of the air conditioner is.
At present, the oil return operation of a multi-split air conditioner is mostly judged according to the operation time, namely, when the oil return time is up, the air conditioner can forcibly enter the oil return operation regardless of the oil shortage of the compressor, so that the waste of electric power is caused. Meanwhile, when oil return is needed, the phenomenon that the compressor runs in an oil shortage mode due to the fact that the oil return time is not reached can be caused, and normal operation of the system is affected.
Therefore, improvements are needed to meet market demands.
Disclosure of Invention
The invention aims to provide an intelligent oil return multi-split air conditioner system aiming at the defects of the prior art, which can intelligently judge whether a compressor is lack of oil or not and timely enter oil return operation, thereby not only ensuring the normal operation of the system, but also saving electric power, reducing the use cost and meeting the market demand.
The technical scheme of the invention is as follows:
an intelligent oil return multi-split air conditioner system comprises a refrigerant circulation loop formed by sequentially connecting a compressor, an oil separator, a four-way valve, an outdoor unit heat exchanger, an indoor unit heat exchanger and a gas-liquid separator;
the exhaust port of the compressor is connected with the inlet of the oil separator through an exhaust pipe; the outlet of the oil separator is connected with the four-way valve; the air end of the outdoor unit heat exchanger is connected with the four-way valve; the liquid end of the outdoor heat exchanger is connected with the gas end of the indoor heat exchanger; the liquid end of the heat exchanger of the indoor unit is connected with the four-way valve; the inlet of the gas-liquid separator is connected with the four-way valve; the outlet of the gas-liquid separator is connected with the air suction port of the compressor;
the oil return device also comprises a main oil return pipe and an auxiliary oil return pipe; two ends of the main oil return pipe are respectively connected with the bottom of the oil separator and the inlet of the gas-liquid separator; one end of the auxiliary oil return pipe is communicated with the side wall of the oil separator through a capillary tube I, and the other end of the auxiliary oil return pipe is connected to an air suction port of the compressor;
a temperature sensor I is arranged on an exhaust pipe of the compressor; and a temperature sensor II is arranged on the auxiliary oil return pipe.
Furthermore, a capillary tube II is arranged on the main oil return pipe.
Further, the height of the connection position of the capillary tube I and the oil separator from the bottom of the oil separator is 1/5 of the height of the oil separator.
Further, the diameter of the capillary I is the same as that of the capillary II; the length of capillary II is 1/2 of capillary I.
Furthermore, the indoor unit heat exchangers are connected in parallel.
Further, an outdoor unit electronic expansion valve is arranged at the liquid end of the outdoor unit heat exchanger; and the liquid end of the indoor unit heat exchanger is provided with an indoor unit electronic expansion valve.
The invention has the beneficial effects that:
the intelligent oil return device has reasonable design and obvious effect, can intelligently judge whether the compressor is lack of oil or not, and timely enters oil return operation, thereby not only ensuring the normal operation of the system, but also saving electric power, reducing the use cost and meeting the market demand.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Wherein: 1-a compressor; 2-an oil separator; 3-a four-way valve; 4-outdoor heat exchanger; 5-outdoor electronic expansion valve; 6-electronic expansion valve of indoor machine; 7-indoor heat exchanger; 8-a gas-liquid separator; 9-main oil return pipe; 10-auxiliary oil return pipe; 11-temperature sensor I; 12-temperature sensor II; 13-capillary II; 14-capillary I.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1.
An intelligent oil return multi-split air conditioner system comprises a refrigerant circulation loop formed by sequentially connecting a compressor 1, an oil separator 2, a four-way valve 3, an outdoor unit heat exchanger 4, an indoor unit heat exchanger 7 and a gas-liquid separator 8, and specifically comprises the following steps:
the exhaust port of the compressor 1 is connected with the inlet of the oil separator 2 through an exhaust pipe; the outlet of the oil separator 2 is connected with the four-way valve 3; the air end of the outdoor unit heat exchanger 4 is connected with the four-way valve 3; the liquid end of the outdoor heat exchanger 4 is connected with the gas end of the indoor heat exchanger 7; the liquid end of the indoor unit heat exchanger 7 is connected with the four-way valve 3; the inlet of the gas-liquid separator 8 is connected with the four-way valve 3; the outlet of the gas-liquid separator 8 is connected with the air suction port of the compressor 1; an outdoor electronic expansion valve 5 is arranged at the liquid end of the outdoor heat exchanger 4; and an indoor unit electronic expansion valve 6 is arranged at the liquid end of the indoor unit heat exchanger 7. The indoor unit heat exchangers 7 are connected in parallel.
Further, the oil return device also comprises a main oil return pipe 9 and an auxiliary oil return pipe 10.
Two ends of the main oil return pipe 9 are respectively connected with the bottom of the oil separator 2 and an inlet of the gas-liquid separator 8, so that lubricating oil in the oil separator 2 can flow back to the gas-liquid separator 8 through the main oil return pipe 9. The main oil return pipe 9 is connected with a capillary II13 in series.
One end of the auxiliary oil return pipe 10 is communicated with the side wall of the oil separator 2 through a capillary pipe I14, and the other end is connected to the air suction port of the compressor 1, so that the auxiliary oil return pipe can assist in returning the lubricating oil in the oil separator 2 to the compressor 1. The height of the connection position of the capillary tube I14 and the oil separator 2 from the bottom of the oil separator 2 is 1/5 of the height of the oil separator 2.
The diameter of the capillary I14 is the same as the capillary II 13. The length of capillary II13 is 1/2 of capillary I14.
The exhaust pipe of the compressor 1 is provided with a temperature sensor I11 which can sense the exhaust temperature of the compressor. The auxiliary oil return pipe 10 is provided with a temperature sensor II12 for sensing the temperature of the medium in the auxiliary oil return pipe 10.
The operation process of the invention is as follows:
the system starts running and the discharge temperature T1 of the compressor is sensed by the temperature sensor I. Meanwhile, the temperature T2 of the returned lubricating oil in the auxiliary oil return pipe is sensed by the temperature sensor II.
When the temperature T1-T2 is higher than 10 ℃, the lubricating oil passes through the auxiliary oil return pipe, the lubricating oil level is higher than the auxiliary oil return pipe opening, the oil quantity is sufficient, oil return is not needed, and the system operates normally.
When the temperature T1-T2 is less than 5 ℃, the lubricating oil level in the oil separator is lower than the auxiliary oil return pipe opening, only the refrigerant passes through the auxiliary oil return pipe, and the system has the risk of oil shortage, so that the system enters oil return operation until the temperature T1-T2 is more than 10 ℃ again, the oil return is finished, and the normal operation is changed.
The parts not involved in the present invention are the same as or can be implemented using the prior art.

Claims (6)

1. An intelligent oil return multi-split air conditioner system comprises a refrigerant circulation loop formed by sequentially connecting a compressor, an oil separator, a four-way valve, an outdoor unit heat exchanger, an indoor unit heat exchanger and a gas-liquid separator, and is characterized in that:
the exhaust port of the compressor is connected with the inlet of the oil separator through an exhaust pipe; the outlet of the oil separator is connected with the four-way valve; the air end of the outdoor unit heat exchanger is connected with the four-way valve; the liquid end of the outdoor heat exchanger is connected with the gas end of the indoor heat exchanger; the liquid end of the heat exchanger of the indoor unit is connected with the four-way valve; the inlet of the gas-liquid separator is connected with the four-way valve; the outlet of the gas-liquid separator is connected with the air suction port of the compressor;
the oil return device also comprises a main oil return pipe and an auxiliary oil return pipe; two ends of the main oil return pipe are respectively connected with the bottom of the oil separator and the inlet of the gas-liquid separator; one end of the auxiliary oil return pipe is communicated with the side wall of the oil separator through a capillary tube I, and the other end of the auxiliary oil return pipe is connected to an air suction port of the compressor;
a temperature sensor I is arranged on an exhaust pipe of the compressor; and a temperature sensor II is arranged on the auxiliary oil return pipe.
2. The intelligent oil return multi-split air conditioner system as claimed in claim 1, wherein: and a capillary tube II is arranged on the main oil return pipe.
3. The intelligent oil return multi-split air conditioner system as claimed in claim 1, wherein: the height of the connection position of the capillary tube I and the oil separator from the bottom of the oil separator is 1/5 of the height of the oil separator.
4. The intelligent oil return multi-split air conditioner system as claimed in claim 1, wherein: the diameter of the capillary I is the same as that of the capillary II; the length of capillary II is 1/2 of capillary I.
5. The intelligent oil return multi-split air conditioner system as claimed in claim 1, wherein: the indoor unit heat exchangers are connected in parallel.
6. The intelligent oil return multi-split air conditioner system as claimed in claim 1, wherein: an outdoor unit electronic expansion valve is arranged at the liquid end of the outdoor unit heat exchanger; and the liquid end of the indoor unit heat exchanger is provided with an indoor unit electronic expansion valve.
CN202010667568.4A 2020-07-13 2020-07-13 Intelligent oil return multi-split air conditioner system Active CN111811112B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113137784A (en) * 2021-04-16 2021-07-20 南京天加环境科技有限公司 Multi-connected engine oil circulation pipeline structure and control method thereof
CN113739339A (en) * 2021-09-17 2021-12-03 宁波奥克斯电气股份有限公司 Auxiliary oil return control method of multi-split air conditioner, auxiliary oil return device of compressor and multi-split air conditioner
CN114427700A (en) * 2022-01-26 2022-05-03 宁波奥克斯电气股份有限公司 Multi-split air conditioning system and oil return control method thereof
CN114427699A (en) * 2022-01-26 2022-05-03 宁波奥克斯电气股份有限公司 Multi-split air conditioner system and oil return control method thereof
CN117450693A (en) * 2023-12-25 2024-01-26 珠海格力电器股份有限公司 Compressor oil return control method and device, computer equipment and storage medium

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