CN103423164B - Two-stage variable capacity compressor and control method therefor - Google Patents
Two-stage variable capacity compressor and control method therefor Download PDFInfo
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- CN103423164B CN103423164B CN201210160599.6A CN201210160599A CN103423164B CN 103423164 B CN103423164 B CN 103423164B CN 201210160599 A CN201210160599 A CN 201210160599A CN 103423164 B CN103423164 B CN 103423164B
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Abstract
The invention discloses a two-stage variable capacity compressor and a control method therefor. The two-stage variable capacity compressor comprises a shell body, a first flange, a first stage cylinder, a second stage cylinder, a second flange and a lower cover plate. The first stage cylinder is equipped with an air outlet and a first sliding sheet groove. A first sliding sheet is arranged in the first sliding sheet groove. The second stage cylinder is equipped with an air suction inlet and a second sliding sheet groove. A second sliding sheet is arranged in the second sliding sheet groove. The air outlet is communicated with the inner cavity of the shell body and the air suction inlet through connecting pipes respectively. A one-way valve is arranged on the branch pipe of the connecting pipe communicated with the inner cavity of the shell body. A throttling device is arranged on the branch pipe of the connecting pipe communicated with the air suction inlet. When the compressor is in two-stage runtime, the middle pressure can be adjusted through the throttling device, furthermore the pressure ratio of the cylinders of two stages can be adjusted, and therefore the compressor can be adapted to changes of outside conditions better and the energy efficiency ratio is raised.
Description
Technical field
The present invention relates to compressor, more particularly to a kind of two-stage variable capacity compressor, and its capacity regulation method.
Background technology
Using single-stage compressor kind of refrigeration cycle, the low temperature limitation being obtained in that under room temperature cooling condition, and
The performance of common pump type heat compressor in the case that pressure ratio is larger can not meet requirement.And double-stage compressor, in refrigeration, is made
The process that refrigerant gas bring up to condensing pressure from evaporating pressure is in two stages：First it is compressed to intermediate pressure through low-pressure stage, so
Afterwards condensing pressure is recompressed by intermediate pressure.The advantage of double-stage compressor has：(1) pressure ratio than larger when also can guarantee that certain
Gas transmission coefficient and coefficient of refrigerating performance；(2) change compression efficiency；(3), when pressure ratio is big, such as delivery temperature be will result in using single stage compress
Rising, this will adopt the lubricating oil of high ignition point, and the lubricating oil simultaneously taken out of by high-temperature steam also can increase, and increased point
The load of liquid device, and reduce the heat transfer property of condenser.This problem is just solved using double-stage compressor.So can not only
Meet common refrigeration and heat, and when pressure ratio (vaporizer and condenser pressure ratio) than larger when (ultralow temperature heats and high temperature
Refrigeration) also there is very high performance.
But current double-stage compressor haves the shortcomings that following, because evaporating pressure can become with the temperature change of environment
Change, the pressure ratio of two cylinders of intermediate pressure machine of system also can be continually changing, and this is for the high-low pressure cylinder ratio designing
It is uneconomic, under the smaller operating mode of pressure ratio, the performance of twin-stage does not have the good of single-stage.Existing double-stage compressor can not be controlled
Intermediate pressure processed, that is, the pressure ratio of I and II cylinder can not be controlled.
Content of the invention
For above-mentioned state of the art, first technical problem to be solved by this invention is, provides one kind can change
Become the two-stage variable capacity compressor of two-stage cylinder pressure ratio, to better adapt to the change of outer work condition.
Second technical problem to be solved by this invention is, provides a kind of controlling party of two-stage variable capacity compressor
Method.
The present invention solves the technical scheme that adopted of above-mentioned first technical problem：A kind of two-stage variable capacity compressor,
Including housing, first flange, first order cylinder, second level cylinder, second flange and lower cover, described first order cylinder has row
QI KOU and the first vane slot, in described first vane slot built with the first slide plate, described second level cylinder has air entry and
Two vane slots, in described second vane slot built with the second slide plate；Described air vent through connecting tube respectively with described housing in
Chamber is connected with described air entry, and is provided with single-pass on the arm of the described connecting tube being connected with described housing cavity
Valve, is provided with throttling arrangement on the arm of the described connecting tube being connected with described air entry.
Wherein in an embodiment, described connecting tube is tee T, and it includes supervisor, the first arm and the second arm,
The mouth of pipe of described supervisor is connected with described air vent, the mouth of pipe of described first arm and described second arm respectively with described shell
The inner chamber of body is connected with described air entry, is respectively arranged with described one-way valve on described first arm and described second arm
With described throttling arrangement.
Wherein in an embodiment, described throttling arrangement is choke valve.
Wherein in an embodiment, described throttling arrangement includes three-way valve and capillary tube, and described three-way valve includes import
End, first outlet end and second outlet end, described entrance point is connected to described first outlet end and is connected with described air entry
The arm of described connecting tube on, the two ends of described capillary tube are attempted by described first outlet end and described second outlet end.
Wherein in an embodiment, the assembling corresponding with described second vane slot is provided with described second flange
Hole, in described pilot hole built with the pin being axially movable, and described pin and described pilot hole sealing cooperation, in described pin
Nail afterbody equipped with elastic reset member, the described second slide plate side relative with described second flange is provided with described
The lock groove that pin head matches, and described lock groove through being arranged on the annular seal space of described second slide plate slot tail with described
The intracavity inter-connection of housing, is provided with pressure chamber in described pin back to the side of its head, this pressure chamber through connect air flue with
Described air entry is connected.
Wherein in an embodiment, the axial line eccentric setting of the centrage of described lock groove and described pin.
Wherein in an embodiment, described pin is the big step of the little tail diameter of head diameter, described pilot hole
It is the stepped hole matching with described pin.
Wherein in an embodiment, the head of described pin is taper, and described lock groove opening is provided with taper and expands
Oral area.
Wherein in an embodiment, described elastic reset member is spring, is provided with the in the afterbody of described pin
One spring eye, described lower cover is arranged on the lower section of described second flange, is provided with and described pilot hole on described lower cover
Corresponding second spring hole, described pressure chamber is formed by the described pilot hole below described pin and described second spring hole,
One end of described spring is arranged on described first spring in the hole, and the other end is arranged on described second spring in the hole.
Wherein in an embodiment, described connection air flue include being arranged on the cylinder of the described second level and with described suction
The first connecting hole that QI KOU is connected, be arranged in described second flange and be connected with described first connecting hole second even
Connect hole, be arranged on described lower cover and the 3rd connecting hole that is connected with described second connecting hole and be arranged on described lower cover
The 4th connecting hole connecting described 3rd connecting hole and described second spring hole on plate.
Wherein in an embodiment, it is provided with the electricity for adsorbing described second slide plate in described second slide plate slot tail
Magnet.
The present invention solves the technical scheme that adopted of above-mentioned second technical problem：A kind of described two-stage variable-capacity compression
The control method of machine, comprises the steps：
When compressor single-stage is run, open described one-way valve, throttling arrangement described in standard-sized sheet；
When compressor twin-stage runs, close described one-way valve, control described throttling arrangement, enter the described second level to adjust
The pressure of the coolant of cylinder.
Compared with prior art, two-stage variable capacity compressor provided by the present invention and its control method, double in compressor
When level is run, the size of intermediate pressure can be adjusted by throttling arrangement, and then the pressure ratio of two-stage cylinder can be adjusted, thus more
Adapt to well the change of outer work condition, improve Energy Efficiency Ratio.
Brief description
Fig. 1 is the structural representation of the two-stage variable capacity compressor in the one of embodiment of the present invention；
Fig. 2 is that second level cylinder, second flange and the lower cover of two-stage variable capacity compressor shown in Fig. 1 are assembled together
Cross section structure diagram；
Fig. 3 is that second level cylinder, second flange and the lower cover of two-stage variable capacity compressor shown in Fig. 1 are assembled together
The cross section structure diagram in another direction；
Fig. 4 is the main structure diagram of the second level cylinder of two-stage variable capacity compressor shown in Fig. 1；
Fig. 5 is the main structure diagram of the second slide plate of two-stage variable capacity compressor shown in Fig. 1；
Fig. 6 is the upward view of Fig. 5；
The main structure diagram of the lower cover of two-stage variable capacity compressor shown in Fig. 7 Fig. 1；
Fig. 8 is the structural representation of the two-stage variable capacity compressor in the embodiment of the present invention two.
Each in figure above, 1, housing；2nd, first flange；3rd, the first slide plate；4th, first order cylinder；5th, dividing plate；6th, the second level
Cylinder；61st, air entry；62nd, the first connecting hole；63rd, the second vane slot；64th, annular seal space；7th, second flange；71st, pilot hole；72、
Second connecting hole；8th, lower cover；81st, second spring hole；82nd, the 3rd connecting hole；83rd, the 4th connecting hole；9th, the second slide plate；91、
Lock groove；91a, taper expansion mouth；10th, pin；101st, head；102nd, afterbody；102a, the first spring eye；11st, spring；12nd, single
Port valve；13rd, choke valve；15th, tee T；151st, it is responsible for；152nd, the first arm；153rd, the second arm；16th, three-way valve；17th, capillary
Pipe.
Specific embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments the present invention is described in detail.It should be noted that not conflicting
In the case of, the feature in following embodiment and embodiment can be mutually combined.
Embodiment one
Referring to Fig. 1, the two-stage variable capacity compressor in the present embodiment include housing 1, first flange 2, first order cylinder 4,
Second level cylinder 6, second flange 7, lower cover 8, tee T 15, one-way valve 12 and throttling arrangement, first flange 2, first order gas
Cylinder 4, dividing plate 5, second level cylinder 6, second flange 7, lower cover 8 are assemblied in housing 1 bottom, institute successively by order from top to bottom
State first order cylinder 4 and there is air vent and the first vane slot, in described first vane slot built with the first slide plate 3, described second
Level cylinder 6 has air entry 61 and the second vane slot 63, in described second vane slot 63 built with the second slide plate 9.Described aerofluxuss
Mouthful be connected with the inner chamber of described housing 1 and described air entry 61 respectively through connecting tube, and with described housing 1 intracavity inter-connection
The arm of described connecting tube on be provided with one-way valve 12, on the arm of the described connecting tube being connected with described air entry 61
It is provided with throttling arrangement.
The described throttling arrangement of the present embodiment is preferably choke valve 13.
The described connecting tube of the present embodiment is preferably tee T 15, and it includes being responsible for the 151, first arm 152 and second
Pipe 153, the mouth of pipe of described supervisor 151 is connected with described air vent, described first arm 152 and described second arm 153
The mouth of pipe is connected with the inner chamber of described housing and described air entry 61 respectively, in described first arm 152 and described second arm
It is respectively arranged with described one-way valve 12 and described throttling arrangement on 153.
When compressor single-stage is run, open one-way valve 12, coolant enters first order cylinder 4 through liquor separator, through first
Coolant after level cylinder 4 compression reaches condensing pressure (now not having intermediate pressure) through the first arm 152 and one-way valve 12 row
Enter in housing 1.Now, full throttle 13, connect the air entry 61 of second level cylinder 6, and second level cylinder 6 unloads.
When compressor twin-stage runs, close one-way valve 12, coolant after the second arm 153 through choke valve 13, now
Adjust the aperture of choke valve 13, different apertures can produce different pressure drops, so that the coolant from first order cylinder 4 exclusion is reached
Suitable pressure (adjusting the size of intermediate pressure), subsequently into second level cylinder 6, now second level cylinder 6 loads.
As can be seen here, the two-stage variable capacity compressor being provided by the embodiment of the present invention, when twin-stage runs, by section
Stream device can adjust the size of intermediate pressure, and then can adjust the pressure ratio of two-stage cylinder, thus better adapting to extraneous work
The change of condition, improves Energy Efficiency Ratio.
The present embodiment adopts the following technical scheme that the loading and unloading to realize second level cylinder 6.
Referring to Fig. 2 and Fig. 3, assembling that is corresponding with the second vane slot 63 and axially penetrating through is provided with second flange 7
Hole 71 is it is preferred that described pilot hole 71 is up-small and down-big stepped hole.In pilot hole 71 built with the pin being axially movable
10, and described pin 10 and described pilot hole 71 sealing cooperation, described pin 10 afterbody 102 equipped with elastic reset member.
Preferably, described pin 10 is the step matching with pilot hole 71.Preferably, the head 101 of described pin 10 is taper.
Preferably, described elastic reset member is spring 11, the afterbody 102 of described pin 10 be provided with for place spring 11 the
One spring eye 102a.Pin 10 can move up and down in the presence of spring 11 and pressure reduction.
In conjunction with shown in Fig. 2, Fig. 3 and Fig. 4, the second level cylinder 6 of the second vane slot 63 afterbody is provided with and the second slide plate
The annular seal space 64 that groove 63 is connected, and axially disposed on second level cylinder 6 have first being connected with its air entry 61 even
Connect hole 62.
Referring to Fig. 5 and Fig. 6, the second slide plate 9 side relative with second flange 7 is provided with and matches with described pin 10
The lock groove 91 closing, this lock groove 91 is through being arranged on the annular seal space 64 of described second vane slot 63 afterbody 102 and described housing 1
Intracavity inter-connection.So, in pin 10 head 101 and housing 1, intracavity has the gas of uniform pressure.Preferably, described lock
Only the centrage of groove 91 and the centrage eccentric setting of described pin 10, so can ensure that the second slide plate 9 and roller are completely de-
From.In locked second slide plate 9, the top of pin 10 is not contacted it is ensured that working as needs pin 10 with the bottom of lock groove 91 simultaneously
When pin 10 departs from lock groove 91, the top of pin 10 has enough spaces to form pressure chamber.Preferably, described lock groove 91 is opened
Mouth end is provided with taper expansion mouth 91a, to facilitate pin head to insert.
Referring to Fig. 2, Fig. 3 and Fig. 7, lower cover 8 is provided with the second spring hole 81 corresponding with the first spring eye 102a,
The lower end of spring 11 is placed in second spring hole 81.Described pilot hole 71 and described second spring by described pin 10 lower section
Hole 81 forms pressure chamber, and pressure chamber is connected with described air entry 61 through connecting air flue, connects air flue and is used for transmitting pressure, so
There is in pin 10 afterbody 102 and air entry 61 gas of uniform pressure.Preferably, described connection air flue include being arranged on described
The first connecting hole 62 that is on second level cylinder 6 and being connected with described air entry 61, be arranged in described second flange 7 and
The second connecting hole 72 of being connected with described first connecting hole 62, be arranged on described lower cover 8 and be connected with described second
The 3rd connecting hole 82 and described 3rd connecting hole 82 of connection and described second being arranged on described lower cover 8 that hole 72 is connected
4th connecting hole 83 of spring eye 81.
Further below brief description is carried out to the operation principle of the embodiment of the present invention one：
During initial installation, pin 10 is made to withstand in the lock groove 91 of the second slide plate 9, that is, second level cylinder 6 unloads, and works as operation
When, when needing twin-stage, second level cylinder 6 normal suction (i.e. first order cylinder 4 gas is communicated with air entry 61).
When single-stage is run, coolant enters first order cylinder 4 through liquor separator, reaches condensation pressure through the coolant of first order compression
Power (now not having intermediate pressure) enters in housing 1 through the first arm 152 and one-way valve 12.Now choke valve 13 standard-sized sheet, even
Connect the air entry 61 of second level cylinder 6, because pin 10 afterbody 102 is connected with air entry 61, pin 10 afterbody 102
For high pressure, and and housing 1 in pressure quite, and the pressure in lock groove 91 is also suitable with the pressure of housing 1.Now, exist
In the presence of spring 11, pin 10 moves locking the second slide plate 9, so that the second slide plate 9 and roller is departed from, second level cylinder 6 unloads,
Compressor single-stage is run.
When twin-stage runs, now one-way valve 12 is closed, and coolant enters choke valve 13 through the second arm 153, now adjusts section
The aperture of stream valve 13, choke valve 13 can play the effect adjusting pressure, and different apertures can produce different pressure drops, make from
The coolant of first order cylinder 4 exclusion reaches suitable pressure (adjusting the size of intermediate pressure), subsequently into second level cylinder 6
Air entry 61, now the pressure in air entry 61 is middle pressure (between condensing pressure and evaporating pressure), due to pin 10 tail
Portion 102 is connected with air entry 61, so pin 10 afterbody 102 pressure is also middle pressure.And the pressure in lock groove 91 and housing 1
Interior pressure quite, so just creates pressure differential in the head 101 of pin 10 and afterbody 102, pressure reduction do with, spring
11 move down, and pin 10 head 101 departs from from the lock groove 91 of the second slide plate 9, and the second slide plate 9 recovers normal work, second level gas
Cylinder 6 loads, and compressor twin-stage operates.
Two-stage variable capacity compressor all parts and annexation in addition to individually describing above, remaining structure and existing skill
Art is identical, will not be described here.
Embodiment two
Referring to Fig. 8, from unlike embodiment one, described throttling arrangement includes three-way valve 16 and capillary tube to the present embodiment
17, described three-way valve 16 includes entrance point a, first outlet end b and second outlet end c, described entrance point a and described first outlet
End b is connected on described second arm 153, and the two ends of described capillary tube 17 are attempted by described first outlet end b and described second
On port of export c.
The operation principle of the embodiment of the present invention two is close with embodiment one, and here does not illustrate, mainly to three-way valve 16
Action do and illustrate.
Equally, when initially installing, pin 10 is made to withstand in the lock groove 91 of the second slide plate 9, that is, second level cylinder 6 unloads,
When running, when needing twin-stage, second level cylinder 6 normal suction (i.e. first order cylinder 4 gas is communicated with air entry 61).Work as list
When level turns twin-stage, close one-way valve 12, open the entrance point a and second outlet end c of three-way valve 16, discharge from first order cylinder 4
Gas pressure enter second level cylinder 6 air entry 61, reduced pressure after the throttling action of capillary tube 17.Now air entry
Pressure in 61 is middle pressure (between condensing pressure and evaporating pressure), because pin 10 afterbody 102 is connected with air entry 61
Logical, so pin 10 afterbody 102 pressure is also middle pressure.Pressure in lock groove 91 is suitable with the pressure in housing 1, so in pin
The head 101 of nail 10 and afterbody 102 just create pressure differential, making under of in pressure reduction, and spring 11 moves down, pin 10 head 101
Depart from from the lock groove 91 of the second slide plate 9, the second slide plate 9 recovers normal work, compressor twin-stage operates.Run a period of time
Afterwards, compressor is stable, stablizes in intermediate pressure from first order cylinder 4 expellant gas, is now shut off capillary tube 17, opens three
The entrance point a of port valve 16 and first outlet end b, the normal twin-stage of compressor operates.
Embodiment three
The present embodiment, from unlike embodiment one, arranges electric magnet, described electricity in described second vane slot, 63 afterbody 102
During magnet paths, its iron core can be with the adhesive of described second slide plate 9, thus the second slide plate 9 is drawn through to realize second by electromagnetic force
The unloading of level cylinder 6.
In addition, in above example, first order cylinder 4 is upper cylinder, second level cylinder 6 is lower cylinder, certainly, the second level
Cylinder 6 can also be upper cylinder, and first order cylinder 4 can also be lower cylinder.
Embodiment described above only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the guarantor of the present invention
Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (10)
1. a kind of two-stage variable capacity compressor, including housing, first flange, first order cylinder, second level cylinder, second flange and
Lower cover, described first order cylinder has air vent and the first vane slot, in described first vane slot built with the first slide plate, institute
State second level cylinder and there is air entry and the second vane slot, in described second vane slot built with the second slide plate；It is characterized in that,
Described air vent is connected with the inner chamber of described housing and described air entry respectively through connecting tube, and with described housing cavity phase
It is provided with one-way valve, on the arm of the described connecting tube being connected with described air entry on the arm of described connecting tube of connection
It is provided with throttling arrangement, the pilot hole corresponding with described second vane slot is provided with described second flange, in described dress
Distribution is built with the pin being axially movable, and described pin and described pilot hole sealing cooperation, in the afterbody dress of described pin
Flexible reset element, is provided with the head with described pin on the described second slide plate side relative with described second flange
The lock groove matching, and described lock groove is through being arranged on the annular seal space of described second slide plate slot tail and the interior of described housing
Chamber is connected, and in described pin, the side of its head is provided with pressure chamber, and this pressure chamber is through connecting air flue and described air-breathing
Mouth is connected.
2. it is characterised in that described connecting tube is tee T, it wraps two-stage variable capacity compressor according to claim 1
Include supervisor, the first arm and the second arm, the mouth of pipe of described supervisor is connected with described air vent, described first arm and described
The mouth of pipe of the second arm is connected with the inner chamber of described housing and described air entry respectively, in described first arm and described second
Described one-way valve and described throttling arrangement are respectively arranged with arm.
3. two-stage variable capacity compressor according to claim 1 is it is characterised in that described throttling arrangement is choke valve.
4. two-stage variable capacity compressor according to claim 1 it is characterised in that described throttling arrangement include three-way valve and
Capillary tube, described three-way valve includes entrance point, first outlet end and second outlet end, described entrance point and described first outlet end
It is connected on the arm of the described connecting tube being connected with described air entry, the two ends of described capillary tube are attempted by described first and go out
On mouth end and described second outlet end.
5. two-stage variable capacity compressor according to claim 1 it is characterised in that the centrage of described lock groove with described
The axial line eccentric setting of pin.
6. two-stage variable capacity compressor according to claim 1 is it is characterised in that described pin is the little afterbody of head diameter
The big step of diameter, described pilot hole is the stepped hole matching with described pin.
7. two-stage variable capacity compressor according to claim 1 it is characterised in that described pin head be taper, institute
State lock groove opening and be provided with taper expansion mouth.
8. two-stage variable capacity compressor according to claim 1 it is characterised in that described elastic reset member be spring,
It is provided with the first spring eye in the afterbody of described pin, described lower cover is arranged on the lower section of described second flange, described
The second spring hole corresponding with described pilot hole is provided with lower cover, described pressure chamber is by the described dress below described pin
Distribution and described second spring hole are formed, and one end of described spring is arranged on described first spring in the hole, and the other end is arranged on institute
State second spring in the hole.
9. two-stage variable capacity compressor according to claim 8 is it is characterised in that described connection air flue includes being arranged on institute
State the first connecting hole that is on the cylinder of the second level and being connected with described air entry, be arranged in described second flange and with institute
State the second connecting hole that the first connecting hole is connected, be arranged on described lower cover and be connected with described second connecting hole
3rd connecting hole and described 3rd connecting hole that connects being arranged on described lower cover are connected with the 4th of described second spring hole
Hole.
10. a kind of control method of two-stage variable capacity compressor as in one of claimed in any of claims 1 to 9, its feature exists
In comprising the steps：
When compressor single-stage is run, open described one-way valve, throttling arrangement described in standard-sized sheet；
When compressor twin-stage runs, close described one-way valve, control described throttling arrangement, enter described second level cylinder to adjust
Coolant pressure.
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| CN201210160599.6A CN103423164B (en) | 2012-05-22 | 2012-05-22 | Two-stage variable capacity compressor and control method therefor |
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| CN105626524B (en) * | 2014-11-28 | 2017-11-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Single cylinder capacity variable type compressor and air-conditioning system |
| CN108302041B (en) * | 2015-06-19 | 2019-08-02 | 珠海格力电器股份有限公司 | air conditioning system |
| CN106704189A (en) * | 2015-08-10 | 2017-05-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor and heat exchange system |
| CN106930947B (en) * | 2015-12-30 | 2018-12-04 | 珠海格力电器股份有限公司 | pressure switching mechanism and compressor |
| CN105508248A (en) * | 2016-01-19 | 2016-04-20 | 广东美芝制冷设备有限公司 | Capacity-variable compressor |
| CN106122012B (en) * | 2016-08-22 | 2018-06-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor list twin-tub switching device and positive displacement compressor |
| CN109882413B (en) * | 2019-04-01 | 2021-06-08 | 安徽美芝精密制造有限公司 | Rotary compressor and refrigerating system with same |
| CN113982926A (en) * | 2021-10-19 | 2022-01-28 | 珠海格力节能环保制冷技术研究中心有限公司 | Single-stage and double-stage switching compressor, air conditioning system and control method |
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| CN101091063A (en) * | 2005-02-23 | 2007-12-19 | Lg电子株式会社 | Capacity varying type rotary compressor and refrigeration system having the same |
| CN102251965A (en) * | 2010-05-19 | 2011-11-23 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor capable of performing one-stage and double-stage switching, and control method thereof |
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