CN111595067A - Multi-cylinder compressor oil return system, air conditioning system and control method - Google Patents
Multi-cylinder compressor oil return system, air conditioning system and control method Download PDFInfo
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- CN111595067A CN111595067A CN202010385572.1A CN202010385572A CN111595067A CN 111595067 A CN111595067 A CN 111595067A CN 202010385572 A CN202010385572 A CN 202010385572A CN 111595067 A CN111595067 A CN 111595067A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 29
- 239000010725 compressor oil Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003921 oil Substances 0.000 claims abstract description 194
- 239000010687 lubricating oil Substances 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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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
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/37—Capillary tubes
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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
- 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
- F25B49/022—Compressor control arrangements
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/074—Details of compressors or related parts with multiple cylinders
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/077—Compressor control units, e.g. terminal boxes, mounted on the compressor casing wall containing for example starter, protection switches or connector contacts
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
The invention provides an oil return system of a multi-cylinder compressor, an air conditioning system and a control method. The multi-cylinder compressor oil return system comprises an oil return flow path arranged between an oil return pipe outlet of the oil separator and an oil inlet of an oil pool of the compressor; the oil return flow path comprises a first oil path and a second oil path which are arranged in parallel, a control valve arranged on the first oil path and a capillary tube arranged on the second oil path, and the control valve has an opening state and a closing state. The invention simplifies the structure of the control device and simplifies the control.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an oil return system of a multi-cylinder compressor, an air conditioner system and a control method.
Background
The existing air conditioning system usually adopts a single-suction single-row compressor, and a refrigeration cycle loop is formed by the single-row compressor and single-row or multi-row heat exchangers indoors and outdoors, so that indoor air is heated or cooled, and the requirement of indoor environment comfort is met. The air conditioning system can only realize one evaporation temperature and one condensation temperature because the compressor is only connected with the indoor heat exchanger and the outdoor heat exchanger through the suction port and the exhaust port. In order to realize the step heating or cooling of indoor air, some air conditioning systems adopt a dual-temperature air conditioning system with double cylinders connected in parallel with a compressor so as to improve the system energy efficiency and slow down the attenuation speed of the energy efficiency under the working condition of low-temperature heating and frosting. However, the air conditioning system adopting the double-cylinder parallel compressor has the defects that the exhaust oil-spraying rate is high due to the fact that the oil blocking device is not necessary for the direct exhaust cylinder of the compressor, and the compressor is abraded due to oil shortage after long-term operation.
Alternatively, the oil return control may be realized by another structure, for example, the oil return control may be performed by controlling a plurality of regulating valves in an interlocking manner, but the control method is complicated, and the control valve needs to be controlled according to the operating state of the air conditioning system. And, the oil return is mainly controlled by the opening degree, and the control complexity is further increased.
Disclosure of Invention
In view of the above, the present invention provides an oil return system, an air conditioning system and a control method for a multi-cylinder compressor, which are at least used for solving the problem of complex oil return control structure and control mode in the prior art, and specifically:
in a first aspect, a multi-cylinder compressor oil return system is provided,
the oil return flow path is arranged between an outlet of an oil return pipe of the oil separator and an oil inlet of an oil pool of the compressor:
the oil return flow path comprises a first oil path and a second oil path which are arranged in parallel, a control valve arranged on the first oil path, and a capillary tube arranged on the second oil path,
the control valve has two states, open and closed.
Further optionally, the ratio of the valve diameter of the control valve to the inner diameter of the capillary tube is 4.8-8.4.
Further optionally, the capillary tube has an inner diameter of 0.9mm to 1.24mm and a length of 350mm to 1500 mm; the valve diameter of the control valve is 4mm-9.52 mm.
Further optionally, the control valve is an electromagnetic two-way valve.
The second aspect provides an air conditioning system, including double-cylinder compressor, oil separator and above-mentioned many cylinder compressor oil return system, the intake pipe of oil separator with the direct gas vent of double-cylinder compressor is connected, the oil extraction pipe of oil separator passes through many cylinder compressor oil return system with the oil sump oil inlet of double-cylinder compressor is connected.
Further optionally, the oil separator is 5cm to 60cm above the oil sump.
In a third aspect, a control method of the air conditioning system is provided, wherein the control valve is opened at least when the double-cylinder compressor is stopped and started.
Further optionally, when the air conditioning system operates in the cooling mode, the control valve is opened, and the lubricating oil separated in the oil separator flows back to the oil sump through the first oil path.
Further optionally, when the air conditioning system operates in a heating mode and/or a defrosting mode, the state of the control valve includes:
when the double-cylinder compressor is started, the control valve is opened,
after the double-cylinder compressor runs for a first preset time, the control valve is closed,
when the control valve is closed, the lubricating oil in the oil separator flows back to the oil pool through the capillary tube under the action of pressure.
Further optionally, the first preset time period is 5min to 10 min.
According to the invention, the control valve and the capillary tube are used for controlling the return oil with the separator, so that the oil discharged by the compressor can flow back to the oil pool in time, and the effective lubrication of the parts in the compressor is ensured. And the control valve and the capillary tube are arranged in parallel, so that the structure of the oil return system of the multi-cylinder compressor is simplified.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic diagram of a multi-cylinder compressor oil return system according to an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating a connection state between an oil return system of the multi-cylinder compressor and the multi-cylinder compressor according to the embodiment of the invention;
FIG. 3 is a schematic diagram illustrating a cooling mode of an air conditioning system according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a heating mode of the air conditioning system according to the embodiment of the invention.
In the figure:
10-an oil separator; 11-an air inlet pipe; 12-an exhaust pipe; 13-an oil return pipe; 20-a multi-cylinder compressor oil return system; 21-a control valve; 22-a capillary tube; 30-a two-cylinder compressor; 31-a first compression cylinder; 311-first exhaust port; 312-a first air intake; 32-a second compression cylinder; 321-a second exhaust port; 322-second suction port; 33-oil sump inlet; 41-a first four-way valve; 42-a second four-way valve; 50-an outdoor heat exchanger; 51-an outdoor fan; 61-first throttling means; 62-a second throttling device; 71-a first indoor heat exchanger; 72-a second indoor heat exchanger; 73-indoor fan.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
According to the invention, the multi-cylinder compressor oil return system is arranged between the oil separator and the oil pool of the multi-cylinder compressor, so that the oil separated from the oil separator flows back to the oil pool, and sufficient lubricating oil is ensured in the compressor. And the oil return system of the multi-cylinder compressor can control oil return only by controlling the opening and closing of the control valve in a mode of connecting the control valve and the capillary in parallel, so that the structure and the control method of the oil return system of the multi-cylinder compressor are simplified.
Example 1
As shown in fig. 1 and 2, in the present embodiment, the present invention provides an oil return system for a multi-cylinder compressor, including: the oil return flow path is arranged between an outlet of an oil return pipe of the oil separator and an oil inlet of an oil pool of the compressor;
the oil return flow path comprises a first oil path and a second oil path which are arranged in parallel, a control valve arranged on the first oil path and a capillary tube arranged on the second oil path, and the control valve has an opening state and a closing state.
The oil separator 10 is used for separating lubricating oil carried in gas discharged by the compressor from the gas, and is disposed at a direct gas outlet of the multi-cylinder compressor, that is, at a direct gas outlet of the multi-cylinder compressor, for example, the multi-cylinder compressor is a two-cylinder compressor 30, a refrigerant sucked in a gas suction port of one cylinder in the two-cylinder compressor 30 is compressed and then directly discharged through a gas outlet of the cylinder, and a gas outlet of the cylinder is a direct gas outlet of the multi-cylinder compressor.
And the multi-cylinder compressor oil return system 20 is arranged between the oil return pipe 13 of the oil separator 10 and an oil inlet of an oil pool of the multi-cylinder compressor and is used for controlling the oil separated in the oil separator 10 to flow back into the oil pool of the multi-cylinder compressor.
The multi-cylinder compressor oil return system 20 comprises a first oil path and a second oil path which are arranged in parallel, a control valve 21 is arranged on the first oil path, a capillary tube 22 is arranged on the second oil path, and the multi-cylinder compressor oil return system 20 is used for enabling the oil separator 10 and an oil pool of a multi-cylinder compressor to be communicated through the first oil path and the second oil path or the second oil path, namely when the control valve 21 is opened, the first oil path and the second oil path are simultaneously communicated, and when the control valve 21 is closed, the first oil path is disconnected, and the second oil path is communicated. The ratio of the valve diameter of the control valve 21 to the inner diameter of the capillary 22 is 4.8 to 8.4, preferably 6.3.
Specifically, as shown in fig. 2, the two-cylinder compressor 30 includes a first compression cylinder 31 and a second compression cylinder 32, the intake pipe 11 of the oil return separator 10 is connected to the second exhaust port of the second compression cylinder 32, the oil return pipe of the oil separator 10 is connected to the multi-cylinder compressor oil return system 20, the multi-cylinder compressor oil return system 20 is connected to the oil sump inlet 33 of the two-cylinder compressor 30, that is, the oil return pipe 13 is simultaneously connected to the control valve 21 and the capillary tube 22, and then the control valve 21 and the capillary tube 22 are simultaneously connected to the oil sump inlet 33.
Preferably, the control valve 21 comprises an electromagnetic two-way valve, which has an opening state or a closing state, and the valve diameter of the electromagnetic two-way valve is 4mm-9.52mm, preferably 6 mm. The valve diameter is selected based on the fact that the lubricating oil can flow back through the control valve 21 smoothly when the control valve 21 is opened because the lubricating oil can flow back through the control valve 21 by gravity, and the lubricating oil needs a larger flow area because the lubricating oil has a smaller gravitational potential energy and a larger viscosity. Preferably, the capillary tube 22 has an inner diameter of 0.9mm to 1.24mm and a length of 350mm to 1500mm, the specific length being determined according to the power of the compressor, for example, when the compressor is matched with an air conditioning system of 1 to 1.5HP, the inner diameter of the capillary tube 22 is 0.95mm and the length is 750mm to 850 mm; when the compressor is matched with a 2HP air conditioning system, the capillary tube 22 has an inner diameter of 0.95mm and a length of 550mm-650mm, or an inner diameter of 1.24mm and a length of 1300mm-1500 mm; when the compressor is matched to a 3-5HP air conditioning system, the capillary tube 22 has an inner diameter of 0.95mm and a length of 350mm-450mm, or alternatively, an inner diameter of 1.24mm and a length of 900mm-1000 mm.
Preferably, the oil separator 10 is 5cm-60cm higher than the oil pool, in particular, the oil return pipe 13 opening of the oil separator 10 is 35cm-60cm higher than the oil pool inlet of the multi-cylinder compressor, and preferably 20cm-30cm higher.
In the embodiment, the control valve and the capillary tube are connected in parallel, so that the oil return can be controlled only by controlling the opening and closing of the control valve, the oil return control of the oil separator can be simpler, the oil return problem of the double-suction double-row compressor is solved, the structure is simplified, and the control cost is reduced.
Example 2
In this embodiment, the present invention provides an air conditioning system, which includes a dual-cylinder compressor 30, a heat exchange system, and the oil return system of the multi-cylinder compressor in the above embodiments, the oil return system of the multi-cylinder compressor is connected between the direct exhaust port of the dual-cylinder compressor 30 and the oil inlet of the oil pool, and the exhaust port of the oil return assembly is communicated with the heat exchange system.
As shown in fig. 3 and 4, the heat exchange system includes an indoor heat exchange portion and an outdoor heat exchange portion, and the indoor heat exchange portion and/or the outdoor heat exchange portion includes two heat exchangers, specifically, in the present embodiment, the heat exchange system includes a first four-way valve 41, a second four-way valve 42, an outdoor heat exchanger 50, an outdoor fan 51, a first indoor heat exchanger 71, a second indoor heat exchanger 72, an indoor fan 73, a first throttling device 61, and a second throttling device 62.
The specific connection mode of the double-cylinder compressor 30 is as follows: the first exhaust port 311 of the first compression cylinder 31 of the two-cylinder compressor 30 is communicated with the first valve port of the first four-way valve 41, and the third valve port of the first four-way valve 41 is communicated with the first intake port 312 of the first compression cylinder 31; a second port of the first four-way valve 41 is communicated with a first port of the outdoor heat exchanger 50, and a fourth port of the first four-way valve 41 is communicated with a first port of the first indoor heat exchanger 71; a second exhaust pipe of a second compressor of the two-cylinder compressor 30 is communicated with an air inlet pipe 11 of the oil separator 10, an exhaust pipe 12 of the oil separator 10 is communicated with a first valve port of a second four-way valve 42, and an oil return pipe 13 of the oil separator 10 is communicated with an oil pool inlet 33 of the two-cylinder compressor 30 through the multi-cylinder compressor oil return system 20, so that the oil return pipe 13 of the oil separator 10 can be communicated with an oil pool through a first oil path or a second oil path independently or simultaneously in different operation modes; the third port of the second four-way valve 42 is communicated with the second suction port 322 of the second compression cylinder 32; a second port of the second four-way valve 42 is communicated with a first port of the outdoor heat exchanger 50, and a fourth port of the second four-way valve 42 is communicated with a first port of the second indoor heat exchanger 72; the second port of the heat exchanger of the outdoor heat exchanger 50 is communicated with the first ports of the first throttling device 61 and the second throttling device 62 at the same time, the second port of the first throttling device 61 is communicated with the second port of the first indoor heat exchanger 71, and the second port of the second throttling device 62 is communicated with the second port of the second indoor heat exchanger 72.
In the embodiment, the oil return system of the multi-cylinder compressor of the embodiment is arranged to control the oil return of the oil separator, so that the oil return control and the structure of the oil separator are simpler, and the overall structure of the air conditioning system is simplified.
Example 3
In this embodiment, the present invention further provides a control method of the air conditioning system, in which the control valve 21 is opened at least when the dual-cylinder compressor 30 is stopped and started, so that the oil in the oil separator 10 flows into the oil sump through the first oil path.
The method specifically comprises the following steps:
when the air conditioning system operates in the cooling mode, the pressures of the first exhaust port 311 and the second exhaust port 321 of the two-cylinder compressor 30 are the same, at this time, the refrigerant discharged from the second exhaust port 321 contains more lubricating oil, more lubricating oil can be separated from the oil separator 10, at this time, the control valve 21 is opened, and the lubricating oil separated from the oil separator 10 mainly returns by gravity, that is, the lubricating oil flows back to the oil sump of the two-cylinder compressor 30 through the first oil path, that is, through the control valve 21 under the action of gravity. Preferably, during this process, a part of the lubricating oil in the oil separator 10 may also flow into the oil sump through the first oil passage, i.e., a small amount of oil may flow into the oil sump through the capillary tube 22.
When the air conditioning system operates in the heating mode and the dual-cylinder compressor 30 is started, the exhaust of the second exhaust port 321 of the dual-cylinder compressor 30 may carry more lubricating oil due to unstable operation of the system, and at this time, the control valve 21 is opened, so that the lubricating oil separated from the oil separator 10 can flow back to the oil tank through the first oil path relatively quickly. When the dual-cylinder compressor 30 operates for a first preset time period, the compressor enters a stable operation stage, and preferably, the first preset time period is 5min to 10 min. After the two-cylinder compressor 30 operates stably, the amount of oil carried by the exhaust gas discharged from the second exhaust port 321 is small, and in order to avoid air leakage, that is, gas is discharged through the oil return pipe 13 of the oil separator 10 under the action of the condensation pressure difference, at this time, the control valve 21 is closed, and a small amount of the lubricating oil separated from the oil separator 10 flows back into the oil sump through the second oil passage under the action of the condensation pressure difference (the pressure difference ranges from 0.1 to 0.9 MPa), and the lubricating oil stably flows back into the oil sump through the second oil passage, that is, the capillary 22 under the action of pressure due to the limitation of the flow rate of the capillary 22.
Preferably, after the two-cylinder compressor 30 enters the stable operation stage, the second oil path cannot ensure that the lubricating oil in the oil separator 10 flows back into the oil sump quickly after the second oil path is operated for a long time because the amount of the oil returned by the second oil path is relatively small. Therefore, in order to ensure that the lubricating oil in the oil separator 10 can quickly flow back to the oil sump, the control valve 21 needs to be controlled in an intermittent opening manner, for example, after the two-cylinder compressor 30 continuously operates for a second preset time period from the time when the control valve 21 is closed, the control valve 21 is opened, then the control valve 21 is closed again after being opened for a third preset time period, then the control valve is opened after the second preset time period, and the operation is cycled so as to ensure the smooth oil return of the lubricating oil. Preferably, the second preset time period is 40min-70min, for example, the second preset time period is 60 min; the third preset time period is 3min-6min, for example, the third preset time period is 5 min.
In this embodiment, the control valve 21 and the capillary tube 22 are connected in parallel, so that the control valve 21 is closed during the operation of the heating mode, that is, the capillary tube 22 can ensure that the lubricating oil can flow back into the oil sump, thereby ensuring the stability of the operation of the compressor, reducing the control action on the control valve 21, and making the control simpler.
Preferably, in the defrosting mode, the same control manner as that of the heating mode is adopted, that is, when the two-cylinder compressor 30 is started, the control valve 21 is opened, and after the operation is performed for the first preset time period, the control valve 21 is closed.
Preferably, after the operation is stabilized, the control valve 21 is operated in an intermittent opening and closing manner, i.e. the control valve 21 is closed for a second preset time period, then opened for a third preset time period,
when the two-cylinder compressor 30 is started, the control valve 21 is opened,
after the two-cylinder compressor 30 has been operating for a first predetermined length of time, the control valve 21 is closed.
Preferably, in the shutdown state, the control valve 21 is opened, and since the position of the oil separator 10 is higher than that of the oil sump, the control valve 21 is opened, so that the lubricating oil remaining in the oil separator 10 can flow back into the oil sump through the first oil path under the action of gravity, so that the two-cylinder compressor 30 has a sufficient amount of lubricating oil in the oil sump at the next startup, and effective lubrication of each component during the startup process is ensured.
In conclusion, the oil return system of the multi-cylinder compressor, which comprises the control valve and the capillary tube, is arranged to control the oil return of the separator, so that the oil discharged by the compressor can flow back to the oil groove in time, and the effective lubrication of the parts in the compressor is ensured. And the control valve and the capillary tube are arranged in parallel, so that the structure of the oil return system of the multi-cylinder compressor is simplified, the control valve is only required to be controlled during control, and the control only comprises opening and closing actions, so that the whole control mode is simpler.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. An oil return system of a multi-cylinder compressor is characterized in that,
the oil return flow path is arranged between an outlet of an oil return pipe of the oil separator and an oil inlet of an oil pool of the compressor;
the oil return flow path comprises a first oil path and a second oil path which are arranged in parallel, a control valve arranged on the first oil path, and a capillary tube arranged on the second oil path,
the control valve has two states, open and closed.
2. The multi-cylinder compressor oil return system of claim 1 wherein the ratio of the valve diameter of the control valve to the inner diameter of the capillary tube is 4.8-8.4.
3. The multi-cylinder compressor oil return system of claim 2 wherein the capillary tube has an inner diameter of 0.9mm to 1.24mm and a length of 350mm to 1500 mm; the valve diameter of the control valve is 4mm-9.52 mm.
4. The multi-cylinder compressor oil return system of claim 3 wherein the control valve is an electromagnetic two-way valve.
5. An air conditioning system, characterized in that, including double-cylinder compressor, oil separator and the multi-cylinder compressor oil return system of any one of claims 1-4, the intake pipe of the oil separator is connected with the direct exhaust port of the double-cylinder compressor, the oil discharge pipe of the oil separator is connected with the oil inlet of the oil sump of the double-cylinder compressor through the multi-cylinder compressor oil return system.
6. The air conditioning system of claim 5, wherein the oil separator is 5-60 cm above the oil sump.
7. A control method of an air conditioning system as set forth in claim 5 or 6, characterized in that said control valve is opened at least when said twin cylinder compressor is stopped and started.
8. The control method according to claim 7, wherein when the air conditioning system is operating in a cooling mode, the control valve is opened, and the lubricating oil separated in the oil separator flows back to the oil sump through the first oil passage.
9. The control method of claim 8, wherein the state of the control valve when the air conditioning system is operating in a heating mode and/or a defrost mode comprises:
when the double-cylinder compressor is started, the control valve is opened,
after the double-cylinder compressor runs for a first preset time, the control valve is closed,
when the control valve is closed, the lubricating oil in the oil separator flows back to the oil pool through the capillary tube under the action of pressure.
10. The control method according to claim 9, wherein the first preset time period is 5min to 10 min.
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