CN107906790A - Air conditioner oil returning system, method and air conditioner - Google Patents
Air conditioner oil returning system, method and air conditioner Download PDFInfo
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- CN107906790A CN107906790A CN201711174252.6A CN201711174252A CN107906790A CN 107906790 A CN107906790 A CN 107906790A CN 201711174252 A CN201711174252 A CN 201711174252A CN 107906790 A CN107906790 A CN 107906790A
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- compressor
- oil
- air conditioner
- tonifying
- superheat
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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
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of air conditioner oil returning system, method and air conditioner, at least to solve the problems, such as the excessive influence system heat transfer effect of returning-oil temperature occurred in correlation technique during air conditioner oil return.Disclosed air conditioner oil returning system includes：First oil eliminator, the entrance of the first oil eliminator are connected with the exhaust port side of the compressor in air conditioner, for receiving the gas mixture of coupled compressor discharge, and gas mixture are separated；First oil return line, for the compressor being delivered to the oil isolated by the first oil eliminator in air conditioner；Controller, for when air conditioner oil returning is run, the tonifying Qi degree of superheat of the compressor in air conditioner to adjust the flow of air supply in the tonifying Qi circuit of compressor, to reduce the returning-oil temperature of air conditioner.The problem of influence system heat transfer effect excessive the invention avoids system oil return temperature.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of air conditioner oil returning system, method and air conditioner.
Background technology
Compressor lubricant oil is the material to playing lubricating action between compressor moving component, it is dissolved in refrigerant, with
Refrigerant flows within air-conditioning systems.In the operational process of air conditioner, the lubrication in compressor can enter heat exchanger simultaneously with refrigerant
Part is remained in heat exchanger, so be may result in lubricant in compressor missing, is made compressor electric motor bearing and compression chamber
It cannot effectively lubricate, influence compressor performance and reliability, or even burn compressor.Therefore in the operational process of air conditioner
In, it usually needs lubricating oil is separated from refrigerant by oil return system, then sends compressor back to and is recycled.It is conventional
Circuit be respectively to match somebody with somebody an oil eliminator, air-breathing of the oil return opening close to respective compressor for each compressor in air-conditioning
Mouthful；Or match somebody with somebody an oil eliminator after two compressor parallels, the oil return of oil eliminator is divided into two-way, respectively close to two compressions
The air entry of machine.But this kind of mode is influenced be subject to factors such as run time or architectural differences, can cause to lubricate oil oil inequality, and
Since oil eliminator oil return opening is close to compressor air suction mouth, during oil return, since lubricating oil separates in oil eliminator with exhaust, compared with
High returning-oil temperature influences system heat transfer effect.
The content of the invention
The present invention provides a kind of air conditioner oil returning system, method and air conditioner, at least to solve in correlation technique in sky
The problem of recalling to the returning-oil temperature occurred during oil excessive influence system heat transfer effect.
According to an aspect of the invention, there is provided a kind of air conditioner oil returning system, including：First oil eliminator, it is described
The entrance of first oil eliminator is connected with the exhaust port side of the compressor in the air conditioner, for receiving coupled compression
The gas mixture of machine discharge, and the gas mixture is separated；First oil return line, for described first will to be passed through
The oil that oil eliminator is isolated is delivered to the compressor in the air conditioner；Controller, for being run in the air conditioner oil returning
When, the tonifying Qi degree of superheat of the compressor in the air conditioner adjusts the flow of air supply in the tonifying Qi circuit of the compressor,
To reduce the returning-oil temperature of the air conditioner.
Alternatively, the air conditioner includes the first compressor and the second compressor, and first oil return line is connected to
Between the gas supplementing opening of the oil outlet of first oil eliminator and second compressor.
Alternatively, the air conditioner further includes：Second oil eliminator, the entrance of second oil eliminator and described second
The exhaust port side of compressor is connected, for receiving the gas mixture of the second compressor discharge, and to the air-fuel mixture
Thing is separated；Second oil return line, is connected to the oil outlet of second oil eliminator and the tonifying Qi of first compressor
Between mouthful, for the oil isolated by second oil eliminator to be delivered to first compressor.
Alternatively, first compressor and second compressor parallel, the controller are additionally operable to：In the air-conditioning
When device oil return is run, first compressor is controlled to be run in the lump with second compressor.
Alternatively, the controller in the following manner the compressor in the air conditioner the tonifying Qi degree of superheat adjust
Flow of air supply in the tonifying Qi circuit of the compressor：Obtain the tonifying Qi degree of superheat of the compressor；In the benefit of the compressor
When the gas degree of superheat is more than the first preset value, the aperture of the expansion valve in the tonifying Qi circuit of the compressor is controlled to reduce, described
When the tonifying Qi degree of superheat of compressor is less than the second preset value, the aperture of the expansion valve in the tonifying Qi circuit of the compressor is controlled to increase
Greatly, until the tonifying Qi degree of superheat of the compressor is no more than first preset value and is not less than second preset value.
According to another aspect of the present invention, there is provided a kind of air conditioner, including any one above-mentioned return oil system.
According to a further aspect of the invention, there is provided a kind of air conditioner oil returning method, including：Returned in the air conditioner
During oil operation, the tonifying Qi degree of superheat of the compressor in air conditioner is obtained；The tonifying Qi overheat of compressor in the air conditioner
Degree adjusts the flow of air supply in the tonifying Qi circuit of the compressor, to reduce the returning-oil temperature of the air conditioner.
Alternatively, the air conditioner includes the first oil return separator, the first compressor, the second compressor and the first oil return
Pipeline, the entrance of first oil eliminator are connected with the exhaust port side of first compressor, and first oil return line connects
It is connected between the oil outlet of first oil eliminator and the gas supplementing opening of second compressor.
Alternatively, the air conditioner further includes：Second oil eliminator, the entrance of second oil eliminator and described second
The exhaust port side of compressor is connected；Second oil return line, is connected to the oil outlet and the described first pressure of second oil eliminator
Between the gas supplementing opening of contracting machine, for the oil isolated by second oil eliminator to be delivered to first compressor.
Alternatively, first compressor and second compressor parallel, the method further include：In the air conditioner
When oil return is run, first compressor is controlled to be run in the lump with second compressor.
Alternatively, the tonifying Qi in the tonifying Qi circuit that the compressor is adjusted according to the tonifying Qi degree of superheat of the compressor
Flow, including：When the tonifying Qi degree of superheat of the compressor is more than the first preset value, in the tonifying Qi circuit for controlling the compressor
Expansion valve aperture reduce, when the tonifying Qi degree of superheat of the compressor is less than the second preset value, control the compressor
The aperture increase of expansion valve in tonifying Qi circuit, until the tonifying Qi degree of superheat of the compressor no more than first preset value and
Not less than second preset value.
The scheme that embodiments herein provides, during air conditioner oil returning, compressor in air conditioner
The tonifying Qi degree of superheat adjusts the flow of air supply in the tonifying Qi circuit of compressor, avoids the excessive influence system of system oil return temperature and changes
Thermal effect, improves system heat transfer effect.
Brief description of the drawings
Fig. 1 is a kind of block diagram for return oil system that the embodiment of the present application 1 provides；
Fig. 2 is the flow chart for the air conditioner oil return method that the embodiment of the present application 2 provides.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
Embodiment 1
The present embodiment provides a kind of air conditioner oil returning system, which mainly includes following part：
Oil eliminator, oil return line and controller, wherein, compressor in the entrance and air conditioner of oil eliminator
Exhaust port side is connected, and for receiving the gas mixture of coupled compressor discharge, and gas mixture is separated；
Oil return line is used for the compressor being delivered to the oil isolated by oil eliminator in air conditioner, which can be air-conditioning
Any one in the multiple compressors of system；Controller is used for when air conditioner oil returning is run, the compressor in air conditioner
The tonifying Qi degree of superheat adjust compressor tonifying Qi circuit in flow of air supply, to reduce the returning-oil temperature of air conditioner.
Further, Fig. 1 shows the schematic diagram of another air conditioner oil returning system provided in this embodiment, such as Fig. 1 institutes
Show, the air conditioner include oil eliminator 11, oil eliminator 12, oil return solenoid valve 13, oil return solenoid valve 14, oil return line 15, return
Oil pipe line 16, compressor 17, compressor 18, temperature sensing package 19, temperature sensing package 110, expansion valve 111, expansion valve 112 and pressure sensing
Device 113.
When air-conditioning system is run, superfeed pressure (Pm) is gathered by pressure sensor 113, it is corresponding to obtain superfeed pressure
Saturation temperature Tm, tonifying Qi temperature T1 and T2 are gathered by temperature sensing package 110 and 111.After air-conditioning system enters oil return condition, oil return
Solenoid valve 13 and oil return solenoid valve 14 are opened, the lubricating oil difference separated from oil eliminator 11 and oil eliminator 12
The blowdown pipe of compressor 18 and compressor 17 is flow to by oil return line 15 and oil return line 16.
As shown in Figure 1, oil return line 15 is connected between the oil outlet of oil eliminator 11 and the gas supplementing opening of compressor 18.Oil
The entrance of separator 11 is connected with the exhaust port side of compressor 17, receives the gas mixture that compressor 17 is discharged, and to oil gas
Mixture is separated；Oil return line 16 is connected between the oil outlet of oil eliminator 12 and the gas supplementing opening of compressor 17, is used for
The oil isolated by oil eliminator 12 is delivered to compressor 17.The air conditioner further includes controller (not shown in Fig. 2), should
Controller is used for the tonifying Qi degree of superheat for first obtaining compressor (the first compressor and/or the second compressor)；In the tonifying Qi of compressor
When the degree of superheat is more than the first preset value, if the tonifying Qi degree of superheat of compressor 17 is more than the first preset value, then compressor is controlled
The aperture of expansion valve 111 in 17 tonifying Qi circuit reduces, if the tonifying Qi degree of superheat of compressor 18 is more than the first preset value,
Then control the aperture of the expansion valve 112 in the tonifying Qi circuit of compressor 18 to reduce, be less than second in the tonifying Qi degree of superheat of compressor
During preset value, if the tonifying Qi degree of superheat of compressor 17 is less than the second preset value, then in the tonifying Qi circuit for controlling compressor 17
Expansion valve 111 aperture increase, if the tonifying Qi degree of superheat of compressor 18 is less than the second preset value, then control compressor 18
Tonifying Qi circuit in expansion valve 112 aperture increase, continue detect air conditioner in compressor 17 and compressor 18 benefit
The gas degree of superheat, and according to the tonifying Qi degree of superheat control expansion valve 111 in compressor 17 and compressor 18 tonifying Qi circuit and
The aperture of expansion valve 112, until the tonifying Qi degree of superheat of compressor 17 and compressor 18 is no more than the first preset value and is not less than
Second preset value, wherein, expansion valve 111 and expansion valve 112 can be electric expansion valve, oil return line 15 and oil return line
16 can be capillary.
Further, in the case of two compressor parallels of air conditioner in the present embodiment, controller noted above is also used
In：When air conditioner oil returning is run, two compressors of control are run in the lump, specifically, two for air conditioner and pressure even
Contracting machine, if an only compressor is run, if after air-conditioning system meets that oil return condition enters oil return pattern, controls another
Compressor start, ensures the equal normal operation of two compressors, and to prevent that single compressor from running when is likely to occur the situation of oil starvation.
The present embodiment additionally provides a kind of air conditioner, which includes any one above-mentioned air conditioner oil returning system.
In air conditioner oil returning system shown in Fig. 1, air-conditioner outdoor unit has two compressor parallel runnings, this two pressures
Contracting machine is respectively provided with independent oil eliminator, oil return solenoid valve and oil return line, as shown in Figure 1, the oil return opening of oil eliminator 11
Closer to the gas supplementing opening of compressor 18, the lubricating oil separated can be returned to preferentially in compressor 18；Similarly, oil eliminator 12 divides
Separating out the lubricating oil come can preferentially return in compressor 17 so that the oil return system can effectively play oil effect, add
The reliability of compressor operating, while extend the service life of compressor.Importantly, the system makes lubricating oil from compression
Machine gas supplementing opening returns and is left to compressor, by tuning up the electric expansion valve in tonifying Qi circuit, can suitably increase flow of air supply, and then drop
Low lubricating oil temperature, is conducive to improve the system energy efficiency under tonifying Qi pattern.With directly from the mode phase of compressor suction duct oil return
Than lubricating oil can be avoided to be sucked from air intake duct and cause suction temperature to raise and influence the heat transfer effect of system.
Embodiment 2
Present embodiments provide a kind of air conditioner oil return method, this method can by the air conditioner that above-described embodiment 1 provides Lai
Perform, Fig. 1 is the flow chart of this method, as shown in Figure 1, this method includes following processing：
Step 101：When air conditioner oil returning is run, the tonifying Qi degree of superheat of the compressor in air conditioner is obtained；
Wherein, the method for the tonifying Qi degree of superheat of compressor in the air conditioner by the agency of mistake in above-described embodiment 1 is obtained, this
Place repeats no more.
Step 102：The flow of air supply in the tonifying Qi circuit of compressor is adjusted according to the tonifying Qi degree of superheat of compressor, to reduce
The returning-oil temperature of air conditioner.
The flow of air supply in the tonifying Qi circuit of compressor is adjusted according to the tonifying Qi degree of superheat of compressor in the present embodiment
Operation can include：When the tonifying Qi degree of superheat of compressor is more than the first preset value, control swollen in the tonifying Qi circuit of compressor
The aperture of swollen valve reduces, when the tonifying Qi degree of superheat of compressor is less than the second preset value, in the tonifying Qi circuit for controlling compressor
The aperture increase of expansion valve, until the tonifying Qi degree of superheat of compressor is no more than the first preset value and is not less than the second preset value.
Alternatively, the air conditioner in the present embodiment include the first oil return separator, the first compressor, the second compressor and
First oil return line, wherein, the entrance of the first oil eliminator is connected with the exhaust port side of the first compressor, and the first oil return line connects
It is connected between the oil outlet of the first oil eliminator and the gas supplementing opening of the second compressor.
Further, air conditioner provided in this embodiment can also include：Second oil eliminator, the second oil eliminator enter
Mouth is connected with the exhaust port side of the second compressor；Second oil return line, is connected to the oil outlet and the first pressure of the second oil eliminator
Between the gas supplementing opening of contracting machine, for the oil isolated by the second oil eliminator to be delivered to the first compressor.
Alternatively, the first compressor and the second compressor parallel in the present embodiment, based on this, side provided in this embodiment
Method further includes：When air conditioner oil returning is run, the first compressor of control is run in the lump with the second compressor.Specifically, for sky
Two of device and compressor even are adjusted, if an only compressor is run, condition enters back if air-conditioning system meets oil return
After oily operational mode, control another compressor to start, ensure the equal normal operation of two compressors, to prevent single compressor from transporting
The situation of oil starvation is likely to occur during row.
Air conditioner oil return method provided in this embodiment is illustrated below by way of exemplary mode.
In one example, the air conditioner oil return method of the application includes following processing：
In system operation, superfeed pressure Pm is gathered by being arranged at the pressure sensor at air-conditioning tonifying Qi manifold, is obtained
The corresponding saturation temperature Tm of superfeed pressure, tonifying Qi temperature T1 and T2 are gathered by temperature sensing package 11 and 13.
Air-conditioning system meets oil return condition, into oil return operational mode.Into after oil return operational mode, oil return solenoid valve A
Opened with B, the lubricating oil separated from oil eliminator A and B is respectively by flowing to compressor blowdown pipe after oil return line；
Lubricating oil can cause tonifying Qi temperature T1 or T2 to raise after flowing to blowdown pipe, it will usually cause the tonifying Qi degree of superheat bigger than normal.
The tonifying Qi degree of superheat of compressor A can be obtained by T1-Tm, and the tonifying Qi degree of superheat of compressor B can be obtained by T2-Tm.According to obtaining
The tonifying Qi degree of superheat obtained judges whether the compressor tonifying Qi degree of superheat is suitable.
If compressor A or B the tonifying Qi degree of superheat is less than normal, by the corresponding tonifying Qi of compressor less than normal of the corresponding tonifying Qi degree of superheat
The aperture of the electric expansion valve of branch is turned down, then returns again to the step for judging whether the tonifying Qi degree of superheat is suitable；Similarly, if compression
Machine A or B the tonifying Qi degree of superheat is bigger than normal, then by the electronic expansion of the corresponding tonifying Qi branch of corresponding tonifying Qi degree of superheat compressor bigger than normal
The aperture of valve tunes up, then return again to judge the tonifying Qi degree of superheat whether appropriate steps.Until the compressor A and B tonifying Qi degree of superheat is all
Untill suitable, then the corresponding tonifying Qi electronic expansion valve opening of compressor is kept.
System meets oil return termination condition, and oil return terminates.Air-conditioner set exits oil return pattern, and oil return solenoid valve A and B are closed
Close.System recovers the operational mode operation before oil return pattern.
It should be noted that, although embodiments herein 1 and embodiment 2 using air conditioner have two compressors as
Example illustrates, but the scheme of the application is equally applicable to the air conditioner with three or more than three compressors and carries out oil return control
System.
Those skilled in the art will readily occur to the present invention its after considering specification and putting into practice invention disclosed herein
Its embodiment.This application is intended to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the present invention and the common knowledge in the art do not invented including the present invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the invention is not limited in the precision architecture for being described above and being shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is only limited by appended claim.
Claims (11)
- A kind of 1. air conditioner oil returning system, it is characterised in that including：First oil eliminator, the entrance of first oil eliminator are connected with the exhaust port side of the compressor in the air conditioner, For receiving the gas mixture of coupled compressor discharge, and the gas mixture is separated；First oil return line, for the compression being delivered to the oil isolated by first oil eliminator in the air conditioner Machine；Controller, for when the air conditioner oil returning is run, the tonifying Qi degree of superheat tune of the compressor in the air conditioner The flow of air supply in the tonifying Qi circuit of the compressor is saved, to reduce the returning-oil temperature of the air conditioner.
- 2. system according to claim 1, it is characterised in that the air conditioner includes the first compressor and the second compression Machine, first oil return line be connected to the oil outlet of first oil eliminator and second compressor gas supplementing opening it Between.
- 3. system according to claim 2, it is characterised in that the air conditioner further includes：Second oil eliminator, the entrance of second oil eliminator is connected with the exhaust port side of second compressor, for connecing The gas mixture of the second compressor discharge is received, and the gas mixture is separated；Second oil return line, is connected between the oil outlet of second oil eliminator and the gas supplementing opening of first compressor, For the oil isolated by second oil eliminator to be delivered to first compressor.
- 4. the system according to Claims 2 or 3, it is characterised in that first compressor and second compressor are simultaneously Connection, the controller are additionally operable to：When the air conditioner oil returning is run, first compressor is controlled to be run in the lump with second compressor.
- 5. system according to claim 1, it is characterised in that the controller is in the following manner according to the air conditioner In the tonifying Qi degree of superheat of compressor adjust flow of air supply in the tonifying Qi circuit of the compressor：Obtain the tonifying Qi degree of superheat of the compressor；When the tonifying Qi degree of superheat of the compressor is more than the first preset value, the expansion in the tonifying Qi circuit of the compressor is controlled The aperture of valve reduces, and when the tonifying Qi degree of superheat of the compressor is less than the second preset value, controls the tonifying Qi of the compressor to return The aperture increase of expansion valve in road, until the tonifying Qi degree of superheat of the compressor is no more than first preset value and is not less than Second preset value.
- 6. a kind of air conditioner, it is characterised in that including the system as described in claim 1 to 5 any one.
- A kind of 7. air conditioner oil returning method, it is characterised in that including：When the air conditioner oil returning is run, the tonifying Qi degree of superheat of the compressor in the air conditioner is obtained；The tonifying Qi degree of superheat of compressor in the air conditioner adjusts the flow of air supply in the tonifying Qi circuit of the compressor, To reduce the returning-oil temperature of the air conditioner.
- 8. the method according to the description of claim 7 is characterized in that the air conditioner includes the first oil return separator, the first pressure Contracting machine, the second compressor and the first oil return line, the exhaust of the entrance of first oil eliminator and first compressor Mouth end is connected, and first oil return line is connected to the oil outlet of first oil eliminator and the tonifying Qi of second compressor Between mouthful.
- 9. according to the method described in claim 8, it is characterized in that, the air conditioner further includes：Second oil eliminator, the entrance of second oil eliminator are connected with the exhaust port side of second compressor；Second oil return line, is connected between the oil outlet of second oil eliminator and the gas supplementing opening of first compressor, For the oil isolated by second oil eliminator to be delivered to first compressor.
- 10. method according to claim 8 or claim 9, it is characterised in that first compressor and second compressor are simultaneously Connection, the method further include：When the air conditioner oil returning is run, first compressor is controlled to be run in the lump with second compressor.
- 11. the method according to the description of claim 7 is characterized in that described adjusted according to the tonifying Qi degree of superheat of the compressor Flow of air supply in the tonifying Qi circuit of the compressor, including：When the tonifying Qi degree of superheat of the compressor is more than the first preset value, the expansion in the tonifying Qi circuit of the compressor is controlled The aperture of valve reduces, and when the tonifying Qi degree of superheat of the compressor is less than the second preset value, controls the tonifying Qi of the compressor to return The aperture increase of expansion valve in road, until the tonifying Qi degree of superheat of the compressor is no more than first preset value and is not less than Second preset value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711174252.6A CN107906790B (en) | 2017-11-22 | 2017-11-22 | Air conditioner oil return system and method and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711174252.6A CN107906790B (en) | 2017-11-22 | 2017-11-22 | Air conditioner oil return system and method and air conditioner |
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| CN107906790A true CN107906790A (en) | 2018-04-13 |
| CN107906790B CN107906790B (en) | 2020-04-24 |
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| Publication number | Publication date |
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| CN107906790B (en) | 2020-04-24 |
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