CN107339826A - Compressor assembly and there is its refrigeration system - Google Patents
Compressor assembly and there is its refrigeration system Download PDFInfo
- Publication number
- CN107339826A CN107339826A CN201710538250.4A CN201710538250A CN107339826A CN 107339826 A CN107339826 A CN 107339826A CN 201710538250 A CN201710538250 A CN 201710538250A CN 107339826 A CN107339826 A CN 107339826A
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- Prior art keywords
- oil
- compressor
- drive device
- balance tube
- return opening
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Classifications
-
- 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
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/001—Ejectors not being used as compression device
- F25B2341/0016—Ejectors for creating an oil recirculation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses a kind of compressor assembly and there is its refrigeration system, the compressor assembly includes：Two compressors being arranged in parallel, each compressor have oil sump and oil return opening；Oil balance tube, the oil sump of the both ends of the oil balance tube respectively with two compressors are connected；Drive device, the drive device are connected with the oil balance tube and each oil return opening respectively, and the drive device is configured to the lubricating oil in the oil balance tube being delivered to each oil return opening.Compressor assembly according to embodiments of the present invention, lubricating oil in the compressor for the high oil level being arranged in parallel in two compressors will be flowed into oil balance tube in the presence of pressure difference, and the lubricating oil entered in oil balance tube is reassigned under the driving of drive device at the oil return opening of each compressor, poor to balance the oil level between compressor, balance quality is high, efficiency high.
Description
Technical field
The present invention relates to refrigeration technology field, more particularly, to a kind of compressor assembly and the system with the compressor assembly
Cooling system.
Background technology
Compressor parallel technology is in the more and more extensive application of air conditioner refrigerating industry.Compressor in parallel has energy adjustment
Convenience, separate unit shutdown maintenance are convenient, low cost and other advantages.Lubricating oil is indispensable to compressor at work.But due to
Discharge capacity between compressor is different, circuit design difference etc., is likely to result in certain compressor and lacks lubricating oil and be burned out,
The particularly screw compressor of low pressure chamber.
In order to solve the above problems, in correlation technique, be typically employed in parallel connection compressor between oil balance tube is set, oil
Balance pipe connects the oil sump of parallel connection compressor, and in the presence of pressure difference, the lubricating oil in the compressor of high oil level will pass through oil
Balance pipe enters in the oil sump of the compressor of low oil level, to balance the oil level between parallel connection compressor.But using oil balance tube come
The problem of balance efficiency is low, precision is low be present in the oil level difference between balance parallel connection compressor.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, the present invention carries
Go out a kind of compressor assembly, the compressor assembly reassigns to the lubricating oil in oil balance tube on each compressor of parallel connection
In, poor to balance the oil level between compressor, balance quality is high, efficiency high.
The present invention also proposes a kind of refrigeration system with above-mentioned compressor component.
The compressor assembly of embodiment according to a first aspect of the present invention, including：Two compressors being arranged in parallel, Mei Gesuo
Stating compressor has oil sump and oil return opening；Oil balance tube, the both ends of the oil balance tube oil with two compressors respectively
Pond is connected；Drive device, the drive device are connected with the oil balance tube and each oil return opening respectively, the driving dress
Put and be configured to the lubricating oil in the oil balance tube being delivered to each oil return opening.
Compressor assembly according to embodiments of the present invention, by setting oil balance tube, Yi Jishe between parallel connection compressor
The drive device of the oil return opening of connection oil balance tube and each compressor is put, the profit in high oil level compressor in parallel connection compressor
Lubricating oil will be flowed into oil balance tube in the presence of pressure difference, and the lubricating oil flowed into oil balance tube will be in the drive of drive device
Action is with the lower oil return opening for being quickly delivered to each compressor, because the lubricating oil in oil balance tube is fast in the driving of drive device
Speed is distributed and is delivered in each compressor, so that the lubricating oil of high oil level compressor constantly, can be flowed into rapidly
In oil balance tube, so as to greatly improve oily balance efficiency and the oily balance quality between compressor.In addition, the compressor of the application
Component can not have to setting and distinguish high oil level compressor and low oil level compressor, under differential pressure action, in high oil level compressor
Lubricating oil will automatically flow into oil balance tube.The oily balancing work process of compressor assembly is simpler, stable and reliable.
The assembling of compressor assembly is also more convenient.
In addition, compressor assembly according to embodiments of the present invention, can also have following additional technical feature：
According to one embodiment of present invention, the gas returning port of each compressor limits the oil return opening.
According to one embodiment of present invention, the oil return opening is located in the side wall of the oil sump.
According to one embodiment of present invention, the drive device is oil pump.
According to one embodiment of present invention, the drive device is injector, and the injector is provided with the first import, the
Two inlet and outlets, first import are suitable to connection driving gas, and second import connects with the oil balance tube, described
Outlet is connected with each oil return opening.
Alternatively, the first control valve with opening and closing function is in series with the supply air line being connected with first import.
Alternatively, first import is connected with the gas exhaust piping of each compressor.
According to one embodiment of present invention, it is in series between the drive device and each oil return opening with opening and closing
Second control valve of function.
The refrigeration system of embodiment according to a second aspect of the present invention, including according to the above-mentioned first aspect embodiment of the present invention
Compressor assembly.
Refrigeration system according to embodiments of the present invention, by setting the compression according to the above-mentioned first aspect embodiment of the present invention
Thermomechanical components so that the refrigeration system with above-mentioned compressor component with all advantages, repeat no more here.
In addition, the refrigeration system of embodiment according to a second aspect of the present invention, can also have following additional technical feature：
According to one embodiment of present invention, the refrigeration system is heat pump.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the structural representation of refrigeration system according to embodiments of the present invention.
Reference：
Compressor assembly 100；
Compressor 1；First compressor 11；Second compressor 12；
Oil balance tube 2；
Drive device 3；First import 31；Second import 32；Outlet 33；
Gas returning port 101；Exhaust outlet 102；Return line 103；Gas exhaust piping 104；Supply air line 105；First control valve
106；Second control valve 107；
Refrigeration system 200；
First Heat Exchanger 201；First port 2011；Second port 2012；
Second heat exchanger 202；3rd port 2021；4th port 2022；
Throttling arrangement 203；
Four-way valve 204；First valve port 2041；Second valve port 2042；3rd valve port 2043；4th valve port 2044.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, can be with
The concrete meaning of above-mentioned term in the present invention is understood as the case may be.
The compressor assembly 100 of embodiment according to a first aspect of the present invention is described below with reference to Fig. 1.
As shown in figure 1, compressor assembly 100 according to embodiments of the present invention includes：Two compressors 1 being arranged in parallel,
Oil balance tube 2 and drive device 3.
Each compressor 1 has oil sump and an oil return opening, and each compressor 1 also has exhaust outlet 102 and a gas returning port 101, and two
The exhaust outlet 102 of individual compressor 1 communicates with each other, and the gas returning port 101 of two compressors 1 communicates with each other, the both ends point of oil balance tube 2
Oil sump not with two compressors 1 is connected, that is to say, that one end of oil balance tube 2 and the oil sump phase of one of compressor 1
Even, another end of oil balance tube 2 is connected with the oil sump of another compressor 1.
Due to Action of Gravity Field, when the level height difference in the oil sump of two compressors 1, deposited between two compressors 1
Lubricating oil in pressure difference, the oil sump of high oil level compressor 1 will be flowed into oil balance tube 2 under differential pressure action.
In correlation technique, it is poor to balance the oil level between parallel connection compressor 1 generally only to set above-mentioned oil balance tube 2, i.e., high
Lubricating oil in the oil sump of oil level compressor 1 will flow into the oil of low oil level compressor 1 under differential pressure action by oil balance tube 2
In pond, the lubricating oil of high oil level compressor 1 is only from gravity towards the driving force of flowing in low oil level compressor 1 and pressure difference is made
With, the flowing of lubricating oil is slow, and balance efficiency and balance quality are low, thus would become hard to ensure compressor 1 between oil level by and
Shi Pingheng, so as to which certain compressor 1 will be caused to be burned out because lacking lubricating oil.
Therefore, the compressor assembly 100 of the application also includes drive device 3, drive device 3 respectively with oil balance tube 2 and
Each oil return opening is connected, and drive device 3 is configured to the lubricating oil in oil balance tube 2 being delivered to each oil return opening.It is so oily
Lubricating oil in balance pipe 2 will quickly be delivered to the oil return opening of each compressor 1, oil balance under the driving of drive device 3
Lubricating oil driven device 3 in pipe 2 is quickly distributed into after each compressor 1, and the lubricating oil in high oil level compressor 1 is continuous
Flow into oil balance tube 2 and supplemented, so repeatedly, in the process, the oil level of high oil level compressor 1 constantly reduces, low oil
The position oil sump of compressor 1 constantly raises, until the oil level difference between two compressors 1 in parallel is balanced, i.e., between compressor 1
Level height is substantially suitable.Because the lubricating oil in oil balance tube 2 is quickly distributed and is delivered under the driving of drive device 3 often
In individual compressor 1, so that the lubricating oil of high oil level compressor 1 constantly, can be flowed into rapidly in oil balance tube 2, from
And greatly improve the oily balance efficiency between compressor 1 and oily balance quality.
In addition, the lubricating oil in oil balance tube 2 is delivered to put down by the oil return opening of each compressor 1 by drive device 3
Oil level between weighing apparatus compressor 1 is poor, can not have to setting and distinguish high oil level compressor 1 and low oil level compressor 1, make in pressure difference
Under, the lubricating oil in high oil level compressor 1 will be automatically flowed into oil balance tube 2.The oily balancing work of compressor assembly 100
Process is simpler, stable and reliable.The assembling of compressor assembly 100 is also more convenient.
It should be noted that mentioned here, " high oil level compressor 1 " refers to that the oil level of compressor 1 is higher than the oil level of standard
Value, or oil level is of a relatively high compared with the compressor 1 associated with it.Conversely, " low oil level compressor 1 " refers to compressor 1
The substandard oil level value of oil level, or oil level is relatively low compared with the compressor 1 associated with it.
Compressor assembly 100 according to embodiments of the present invention, by setting oil balance tube 2 between parallel connection compressor 1, with
And the drive device 3 of the oil return opening of connection oil balance tube 2 and each compressor 1 is set, the high oil level compression in parallel connection compressor 1
Lubricating oil in machine 1 will be flowed into oil balance tube 2 in the presence of pressure difference, and the lubricating oil flowed into oil balance tube 2 will be
The oil return opening of each compressor 1 is quickly delivered under the driving effect of drive device 3, because the lubricating oil in oil balance tube 2 exists
The driving of drive device 3 is quickly distributed and is delivered in each compressor 1, so that the lubricating oil of high oil level compressor 1 can
Constantly, rapidly to flow into oil balance tube 2, so as to greatly improve the oily balance efficiency between compressor 1 and oil balance essence
Degree.In addition, the compressor assembly 100 of the application can not have to setting and distinguish high oil level compressor 1 and low oil level compressor 1,
Under differential pressure action, the lubricating oil in high oil level compressor 1 will be automatically flowed into oil balance tube 2.The oil of compressor assembly 100
Balancing work process is simpler, stable and reliable.The assembling of compressor assembly 100 is also more convenient.
In one embodiment of the invention, as shown in figure 1, the gas returning port 101 of each compressor 1 limits oil return opening,
That is, the lubricating oil in oil balance tube 2 is redistributed and is delivered to the gas returning port of each compressor 1 by drive device 3
101, the lubricating oil being so reassigned in each compressor 1 mixes with the working gas that compressor 1 is sucked, the work
Gas can play certain cushioning effect to reassigning to the lubricating oil in each compressor 1, so as to suppress to lubricate
Fluctuation caused by the temperature or flow of oil, so that lubricating oil more uniformly and stably can enter in compressor 1.It is optional
Ground, oil return opening can be formed at any position of the low pressure chamber of compressor 1.
In another embodiment of the present invention, oil return opening is located in the side wall of oil sump, and such drive device 3 balances oil
Lubricating oil in pipe 2 is fed directly in the oil sump of each compressor 1, and compressor assembly 100 is simple in construction.
Alternatively, drive device 3 is oil pump (not shown), simple in construction, cost is low, and driving force is strong, can will oil it is flat
Lubricating oil in weighing apparatus pipe 2 is quickly delivered to the oil return opening of each compressor 1.
Preferably, drive device 3 is injector, as shown in figure 1, injector is provided with the first import 31, the and of the second import 32
Outlet 33, the first import 31 are suitable to connection driving gas, and the second import 32 connects with oil balance tube 2, outlet 33 and each oil return
Mouth is connected.The lubricating oil of oil balance tube 2 enters in injector and returning for each compressor 1 is delivered under the injection of driving gas
Hydraulic fluid port.
It should be noted that " driving gas " can be the gas with certain pressure, in order to easy to use and avoid increasing
Add other structure, such as in the specific example shown in Fig. 1, the first import 31 and the phase of gas exhaust piping 104 of each compressor 1
Even, i.e., the driving gas using the gas at the exhaust outlet 102 of compressor 1 as injector, can so avoid setting driving in addition
The source of the gas of gas, thus simplify the structure of compressor assembly 100.Certainly, driving gas can also use single, additional drive
Take offence body, thus drive the pressure of gas to be more prone to control, the structure design of compressor assembly 100 is more flexibly and various
Change.
Alternatively, as shown in figure 1, being in series with the supply air line 105 being connected with the first import 31 with opening and closing function
First control valve 106, driving gas are entered in injector by supply air line 105, and being set on supply air line 105 has opening and closing
First control valve 106 of function, when controlling the first control valve 106 to open, driving gas enters injection by supply air line 105
Device with will enter injector in lubricating oil injection to each compressor 1 oil return opening, and pass through control the first control valve 106
Aperture, driving gas can be controlled to enter the flow of injector, so as to adjust the balance efficiency of lubricating oil between compressor 1,
Specifically, when needing to improve the balance efficiency of lubricating oil, the aperture of the first control valve 106 can be increased, drive the flow of gas
Increase therewith, when needing to reduce the balance efficiency of lubricating oil, the aperture of the first control valve 106 can be turned down, drive gas
Flow reduces therewith.When compressor assembly 100 does not work, the first control valve 106 of control is closed.
Alternatively, the first control valve 106 can be motor-driven valve, it is possible thereby to which motor-driven valve is accessed into compressor assembly 100
In electric-control system, so as to automatically control the flow of driving gas using electric-control method.
Further, the second control valve 107 with opening and closing function is in series between drive device 3 and each oil return opening,
Specifically, two compressors 1 being arranged in parallel respectively the first compressor 11 and the second compressor 12, drive device 3 and first
Second control valve 107 is provided between the oil return opening of compressor 11, between the oil return opening of the compressor 12 of drive device 3 and second
Provided with second control valve 107, by controlling the opening and closing of the second control valve 107 to control distribution and being delivered to each compression
The amount of lubricating oil in machine 1.
For example, when the first compressor 11 is high oil level compressor 1, second to be connected with the first compressor 11 can be turned down
The aperture of control valve 107 closes second control valve 107, tunes up the second control valve 107 being connected with the second compressor 12
Aperture, the amount that the lubricating oil in such oil balance tube 2 enters in the second compressor 12 is bigger, the oil between two compressors 1
Position balance efficiency is higher.
Similarly, when the second compressor 12 is high oil level compressor 1, to be connected with the second compressor 12 can be turned down
The aperture of two control valves 107 closes second control valve 107, tunes up the second control valve being connected with the first compressor 11
107 aperture, the amount that the lubricating oil in such oil balance tube 2 enters in the first compressor 11 is bigger, between two compressors 1
Oil level balance efficiency is higher.
Alternatively, capillary can be in series between drive device 3 and each oil return opening, to play metering function, and into
This is cheap.
The refrigeration system 200 of embodiment according to a second aspect of the present invention, the refrigeration system 200 are described referring to Fig. 1
Including the compressor assembly 100 according to the above-mentioned first aspect embodiment of the present invention.
Refrigeration system 200 according to embodiments of the present invention, by setting according to the above-mentioned first aspect embodiment of the present invention
Compressor assembly 100 so that the refrigeration system 200 with above-mentioned compressor component 100 with all advantages, here no longer
Repeat.
In one embodiment of the invention, refrigeration system 200 is single cooler group.
In another embodiment of the present invention, as shown in figure 1, refrigeration system 200 is source pump.Specifically, freeze
System 200 includes the first compressor 11, the second compressor 12, First Heat Exchanger 201, the second heat exchanger 202, throttling arrangement 203
With four-way valve 204.
The return line 103 of the compressor 12 of return line 103 and second of first compressor 11 is connected in parallel, the first pressure
The gas exhaust piping 104 of the compressor 12 of gas exhaust piping 104 and second of contracting machine 11 is connected in parallel, and First Heat Exchanger 201 includes supplying
The first port 2011 and second port 2012 of refrigerant disengaging, the second heat exchanger 202 include the 3rd end for refrigerant disengaging
The port 2022 of mouth 2021 and the 4th, four-way valve 204 include first to fourth valve port 2044, the first valve port 2041 and gas exhaust piping
104 are connected, and the second valve port 2042 is connected with return line 103, and the 3rd valve port 2043 is connected with first port 2011, the 4th valve port
2044 are connected with the 4th port 2022, wherein, one in the first valve port 2041 and the 3rd valve port 2043 and the 4th valve port 2044
Conducting, the second valve port 2042 turns on another in the 3rd valve port 2043 and the 4th valve port 2044, second port 2012 and the
Three ports 2021 turn on through throttling arrangement 203.
First Heat Exchanger 201 is outdoor heat exchanger, and the second heat exchanger 202 is indoor heat exchanger, such as the second heat exchanger 202
Can be water-side heat, when the first valve port 2041 turns on the 3rd valve port 2043, the second valve port 2042 and the 4th valve port 2044
During conducting, now refrigeration system 200 runs refrigeration mode；When the first valve port 2041 turns on the 4th valve port 2044, the second valve port
2042 and the 3rd valve port 2043 turn on when, now refrigeration system 200 run heating mode.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example describe
Structure, material or feature are contained at least one embodiment or example of the present invention.In this manual, to above-mentioned term
Schematic representation is not necessarily referring to identical embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can combine in an appropriate manner in any one or more embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is limited by claim and its equivalent.
Claims (10)
- A kind of 1. compressor assembly, it is characterised in that including：Two compressors being arranged in parallel, each compressor have oil sump and oil return opening；Oil balance tube, the oil sump of the both ends of the oil balance tube respectively with two compressors are connected；Drive device, the drive device are connected with the oil balance tube and each oil return opening respectively, the drive device It is configured to the lubricating oil in the oil balance tube being delivered to each oil return opening.
- 2. compressor assembly according to claim 1, it is characterised in that the gas returning port of each compressor limits institute State oil return opening.
- 3. compressor assembly according to claim 1, it is characterised in that the oil return opening is located at the side wall of the oil sump On.
- 4. compressor assembly according to claim 1, it is characterised in that the drive device is oil pump.
- 5. compressor assembly according to claim 1, it is characterised in that the drive device is injector, the injection Device be provided with the first import, the second inlet and outlet, first import be suitable to connection driving gas, second import with it is described Oil balance tube connects, and the outlet is connected with each oil return opening.
- 6. compressor assembly according to claim 5, it is characterised in that on the supply air line being connected with first import It is in series with the first control valve with opening and closing function.
- 7. compressor assembly according to claim 5, it is characterised in that first import and each compressor Gas exhaust piping is connected.
- 8. according to the compressor assembly any one of claim 1-7, it is characterised in that the drive device and each institute State and be in series with the second control valve with opening and closing function between oil return opening.
- 9. a kind of refrigeration system, it is characterised in that including the compressor assembly according to any one of claim 1-8.
- 10. refrigeration system according to claim 9, it is characterised in that the refrigeration system is source pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710538250.4A CN107339826A (en) | 2017-07-04 | 2017-07-04 | Compressor assembly and there is its refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710538250.4A CN107339826A (en) | 2017-07-04 | 2017-07-04 | Compressor assembly and there is its refrigeration system |
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| Publication Number | Publication Date |
|---|---|
| CN107339826A true CN107339826A (en) | 2017-11-10 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710538250.4A Pending CN107339826A (en) | 2017-07-04 | 2017-07-04 | Compressor assembly and there is its refrigeration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110513917A (en) * | 2019-08-24 | 2019-11-29 | 武晓宁 | Parallel connection compressor ultra low temperature net for air-source heat pump units |
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| CN103851832A (en) * | 2014-04-02 | 2014-06-11 | 深圳麦克维尔空调有限公司 | Parallel-connection compressor oil balancing device |
| CN204313533U (en) * | 2014-11-26 | 2015-05-06 | 青岛奥利凯中央空调有限公司 | A kind of compressor oil bascule |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110513917A (en) * | 2019-08-24 | 2019-11-29 | 武晓宁 | Parallel connection compressor ultra low temperature net for air-source heat pump units |
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