WO2014190737A1 - 多联机系统制热时的回油方法 - Google Patents
多联机系统制热时的回油方法 Download PDFInfo
- Publication number
- WO2014190737A1 WO2014190737A1 PCT/CN2013/089830 CN2013089830W WO2014190737A1 WO 2014190737 A1 WO2014190737 A1 WO 2014190737A1 CN 2013089830 W CN2013089830 W CN 2013089830W WO 2014190737 A1 WO2014190737 A1 WO 2014190737A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oil return
- opening degree
- indoor
- oil
- outdoor
- Prior art date
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
- F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
- F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements
- F25B2313/02533—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements during heating
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/01—Timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0253—Compressor control by controlling speed with variable speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the invention relates to the control of an air conditioner, and in particular to a method for oil return when heating a multi-line system. Background technique
- the heating operation In the existing multi-line system heating operation, due to the low flow rate of the refrigerant in the main air pipe and the stopped inner air pipe, the oil is easily stored in the pipe section, causing the compressor to have oil shortage, causing insufficient lubrication and lightness. The compressor is malfunctioning and the compressor is damaged. In order to ensure the reliability of the system, the heating operation must be carried out for a certain period of time.
- the multi-line system usually uses the oil return method in the heating operation to switch the four-way wide commutation to the cooling mode, and relies on the liquid refrigerant to bring back the lubricating oil stored in the pipe section.
- the indoor unit acts as an evaporator. At this time, the indoor will stop heating; and after the oil return is completed, the internal machine will still be in a low pressure state for a period of time (ie, the establishment of high pressure requires a period of time). It can be established after the time), so the heating can not be effectively performed during the oil return operation and before the high pressure is established in the initial stage of the heating operation. Therefore, this oil return method makes the use comfort of the multiple mechanism hot.
- the technical problem to be solved by the present invention is to provide a method for returning oil during heating of a multi-line system, which can ensure the reliability of the system while ensuring the continuous heating effect of the system. Improve user comfort.
- the present invention provides a method for returning oil during heating of a multi-line system, wherein the multi-line system includes an outdoor unit and a plurality of indoor unit units connected in parallel, and the outdoor unit includes compression
- the four-way width is not reversed, and the operating frequency f0 of the compressor is adjusted to a preset first oil return frequency fl, and all the The opening degree so of the indoor throttle element is adjusted to a preset oil return opening degree;
- step S4 Determine whether the system is abnormal according to the measured system operating parameters and preset system operating parameters. If yes, Go to step S4, if no, go to step S5;
- step S4 exiting the oil return operation, after the time t1, adjusting the operating frequency f0 of the compressor to a preset second oil return frequency f2, and adjusting the opening degree SO of all the indoor throttle elements to a preset
- the oil return opening degree wherein, f2 ⁇ fl, detecting the operating parameters of the system during the oil returning process, and judging whether the system operation is abnormal according to the measured system operating parameters and the preset system operating parameters, and if so, exiting the oil returning operation, If no, go to step S5;
- f2 > l/2fmax, where fmax is the highest operating frequency of the compressor. In one of the embodiments, 3HZ ⁇ f 1 - f2 ⁇ 7HZ.
- the step of adjusting the operating frequency f0 of the compressor to the first oil return frequency fl includes:
- adjusting the operating frequency f0 of the compressor is the first oil return frequency fl;
- the step of adjusting the opening SO of all the indoor throttle elements to a preset oil return opening comprises:
- the opening degree SO of the indoor throttle element of the indoor unit is adjusted to a preset first oil return opening S1, wherein SI >70 Smax, the Smax is the maximum of the indoor throttle element Opening degree
- the opening degree SO of the indoor throttle element of the indoor unit is compared with the preset second return opening S2. If S0 ⁇ S2, the indoor throttle element of the indoor unit is opened. The degree SO is adjusted to the second oil return opening S2, and if S0>S2, the opening degree SO of the indoor throttle element of the indoor unit is not adjusted, wherein S2>80 Smax, the Smax is the indoor The maximum opening of the throttle element.
- the system operating parameter is one or more of a high pressure, an exhaust temperature, and a low pressure of the system during a return operation.
- tl > 10 min.
- the oil returning method further comprises the step of adjusting the speed of the outdoor fan, comprising: detecting a high pressure and a low pressure of the system during the oil returning operation;
- the rotation speed of the outdoor fan is increased.
- the oil returning method further includes the step of adjusting an opening of the outdoor throttling element, comprising:
- the oil return method further includes the following steps:
- the oil returning method in the heating process of the multi-line system takes into consideration both the oil returning effect and the system reliability, and ensures the system reliability while ensuring the system continuous heating effect. , improve user comfort.
- FIG. 1 is a system diagram of a multi-line system in one embodiment of the present invention.
- FIG. 2 is a flow chart of a method of returning oil when heating a multi-line system in one embodiment of the present invention.
- the multi-line system in this embodiment includes an outdoor unit 10 and a plurality of indoor units 20 connected in parallel, and the outdoor unit 10 includes a compressor 11, a gas-liquid separator 12, and an oil separator. 13.
- the outdoor heat exchanger 15, the outdoor throttle element 16, the indoor heat exchanger 21 and the indoor throttle element 22 are connected by a pipe to form a refrigerant circuit.
- the outdoor throttle element 16 and the indoor throttle element 22 in this embodiment are both electronically expanded.
- the oil returning method in the heating process of the multi-line system in this embodiment includes the following steps:
- Step S1 during the heating operation, when the oil return operation is required, the four-way width 14 is not reversed, and the operating frequency f0 of the compressor 11 is adjusted to a preset first oil return frequency fl,
- the opening degree SO of the indoor throttle element 22 of all the indoor unit units 20 is adjusted to a preset oil return opening degree.
- the compressor 11 operates at the first oil return frequency fl to ensure that the refrigerant flow rate in the system reaches a certain speed, which can drive the flow of lubricating oil in the system to ensure the oil return effect.
- the opening degree SO of the indoor throttle element 22 of all the indoor unit units 20 is adjusted to the oil return opening degree, which not only ensures that the high pressure is not excessively high when the system returns to oil operation, but also ensures the flow rate of the refrigerant in the air tubes of all the indoor unit units. Lifting, thereby promoting the flow of lubricating oil in the air pipe of each indoor unit.
- the step of adjusting the operating frequency f0 of the compressor 11 to the first oil return frequency fl comprises: comparing the operating frequency f0 with the first oil return frequency fl;
- adjusting the operating frequency f0 of the compressor 11 is the first oil return frequency fl;
- the step of adjusting the opening degree S0 of the indoor throttle element 22 of the indoor unit 20 to a preset oil return opening degree comprises:
- the opening degree S0 of the indoor throttle element 22 of the indoor unit 20 is adjusted to a first oil return opening S1, wherein SI > 70 Smax , the Smax is the maximum of the indoor throttle element 22
- the opening degree is such that the oil stored in the pipe section of the shutdown indoor unit 20 participates in the refrigerant circulation to realize the oil return.
- the opening degree S0 of the indoor throttle element 22 of the indoor unit 20 is compared with the second return opening S2. If S0 ⁇ S2, the indoor throttle element 22 of the indoor unit 20 is The opening degree SO is adjusted to the second oil return opening degree S2. If S0 > S2, the opening degree SO of the indoor throttle element 22 of the indoor unit 20 is not adjusted, wherein S2 > 80 Smax, the Smax is The maximum opening of the indoor throttle element.
- the opening degree of the indoor throttle element 22 of the starting indoor unit 20 is adjusted to be more than 80% of the maximum opening degree, and if the original opening degree is already the maximum opening degree, it is no longer opened; the indoor throttle element of the indoor unit 20 of the shutdown unit is stopped. 22 is adjusted to more than 70% of the original opening degree, which can ensure the flow rate of the refrigerant in all the indoor unit 20 to promote the flow of lubricating oil in the air pipe of each indoor unit 20, and ensure the high pressure during the system return operation. Not too high, the protection system runs smoothly.
- Step S2 detecting system operating parameters.
- the operating parameter of the system is a high system during the oil return operation One or more of the pressure value, exhaust temperature, and low pressure value.
- Step S3 Determine whether the system is abnormal according to the measured system operating parameters and the preset system operating parameters. For example, if the high pressure during the oil return operation (the high pressure is the pressure of the pipe section between the compressor 11 and the oil separator detected by the high pressure sensor, the same applies below) is greater than or equal to the set high pressure (3.85 MPa in this embodiment) Or the exhaust gas temperature is greater than the set exhaust gas temperature (105 °C in this embodiment), or low pressure (low pressure is the pressure of the pipe section between the gas-liquid separator 12 and the suction port of the compressor 11 detected by the low-pressure sensor) The same as below) is smaller than the set value (0.168 MPa in this embodiment), and it can be judged that the system is operating abnormally. If it is abnormal, go to step S4, if it is not abnormal, go to step S5.
- Step S4 exiting the oil return operation (that is, adjusting the operating frequency of the compressor 11 to the normal frequency f0, and adjusting the opening degree of the indoor throttle element 22 of each of the indoor unit units 20 to the normal opening degree SO), the elapsed time After t1 (preferably, 5 min ⁇ tl ⁇ 15 min), the operating frequency f0 of the compressor 11 is adjusted to a preset second oil return frequency f2 while adjusting the indoor section of each of the indoor unit units 20
- the opening degree SO of the flow element 22 is a preset oil return opening degree, where f2 ⁇ fl.
- the maximum operating frequency fmax of the compressor 11 is 80 Hz
- the first oil return frequency fl is 50 HZ
- the second oil return frequency f2 is used after tl, and f2 is still greater than 40 Hz. .
- the operating parameters of the system are detected, and whether the system operation is abnormal according to the measured system operating parameters and the preset system operating parameters is determined. If yes, the oil return operation is exited. If no, the process proceeds to step S5.
- Step S5 detecting the oil return time, when the oil return time reaches the set oil return time t2, the oil return ends.
- the oil return time t2 is controlled to ensure the oil return effect while taking into account the system reliability.
- t2 is 4 min.
- the oil returning method in the heating process of the multi-line system in the embodiment further includes the step of adjusting the rotation speed of the outdoor fan 17, which comprises:
- the saturation temperature of the high pressure is >50 °C and the low pressure corresponds to the saturation temperature >12 °C, the rotation speed of the outdoor fan 17 is lowered;
- the speed of the outdoor fan 17 is increased if the high temperature corresponds to a saturation temperature of ⁇ 40 °C and the low pressure corresponds to a saturation temperature of ⁇ 0 °C.
- the operation adjustment of the outdoor fan 17 ensures the low pressure of the system while taking into account the high pressure.
- the control method is as described in the technical solution, so that the control system parameters are within a reasonable range while returning the oil, and the reliability and system of the system during the return oil operation are guaranteed. Thermal effect.
- the oil returning method in the heating process of the multi-line system of the embodiment further includes the step of adjusting the opening degree of the outdoor throttle element 16, including
- Determining the degree of superheat of the outdoor unit i.e., the difference between the air tube temperature of the outdoor unit 10 and the liquid tube temperature of the outdoor unit 10;
- the outdoor throttling element 16 adjusts the opening degree according to the superheat degree of the outdoor unit. As described in the technical solution, it is ensured that the refrigerant maintains a proper superheat degree after passing through the outdoor heat exchanger 15 in the oil returning process, and does not return a large amount of liquid refrigerant to the compressor 11 Causes a liquid hammer to damage the compressor 11.
- the oil returning method in the heating process of the multi-line system in the embodiment further includes the following steps: during the heating operation, monitoring the downtime of the shutdown indoor unit, when the downtime reaches the preset
- the opening degree of the indoor throttle element of the shutdown indoor unit is sequentially increased to the oil return opening
- the time t3 such as lOmin
- the indoor unit of the shutdown is The opening of the indoor throttling element is restored to the original opening.
- the oil stored in the pipe section of the shutdown indoor unit is involved in the refrigerant circulation to achieve oil return.
- the oil returning method in the heating process of the multi-line system takes into consideration both the oil returning effect and the system reliability, and ensures the system heating reliability while improving the system reliability. User comfort.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13886136.4A EP3006845B1 (en) | 2013-05-27 | 2013-12-18 | Oil return method for multiple air conditioning unit in heating |
US14/893,351 US10094599B2 (en) | 2013-05-27 | 2013-12-18 | Oil return method for multi-split air conditioning in heating |
AU2013391135A AU2013391135C1 (en) | 2013-05-27 | 2013-12-18 | Oil return method for multiple air conditioning unit in heating |
CA2913664A CA2913664C (en) | 2013-05-27 | 2013-12-18 | Oil return method for multiple air conditioning unit in heating |
ES13886136T ES2701173T3 (es) | 2013-05-27 | 2013-12-18 | Método de retorno de aceite para unidad de acondicionamiento de aire múltiple en calefacción |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310203080.6A CN104180563B (zh) | 2013-05-27 | 2013-05-27 | 多联机系统制热时的回油方法 |
CN201310203080.6 | 2013-05-27 |
Publications (1)
Publication Number | Publication Date |
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WO2014190737A1 true WO2014190737A1 (zh) | 2014-12-04 |
Family
ID=51961782
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2013/089830 WO2014190737A1 (zh) | 2013-05-27 | 2013-12-18 | 多联机系统制热时的回油方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US10094599B2 (zh) |
EP (1) | EP3006845B1 (zh) |
CN (1) | CN104180563B (zh) |
AU (1) | AU2013391135C1 (zh) |
CA (1) | CA2913664C (zh) |
ES (1) | ES2701173T3 (zh) |
WO (1) | WO2014190737A1 (zh) |
Cited By (2)
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CN106247676A (zh) * | 2016-08-16 | 2016-12-21 | 广东美的暖通设备有限公司 | 空调器的控制方法、控制装置和空调器 |
WO2017053596A1 (en) * | 2015-09-24 | 2017-03-30 | Carrier Corporation | System and method of controlling an oil flow within a refrigeration system |
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