CN1704607A - Hermetic compressor exhaust structure and silencer thereof - Google Patents
Hermetic compressor exhaust structure and silencer thereof Download PDFInfo
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- CN1704607A CN1704607A CN 200410019404 CN200410019404A CN1704607A CN 1704607 A CN1704607 A CN 1704607A CN 200410019404 CN200410019404 CN 200410019404 CN 200410019404 A CN200410019404 A CN 200410019404A CN 1704607 A CN1704607 A CN 1704607A
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- exhaust
- honeycomb duct
- silencer
- cylinder assembly
- motor compressor
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Abstract
This invention provides an enclosed-type contractor air-out structure, which comprises contractor casing, motor part, and compressing part; wherein on the casing between the motor part and compressing part is set a discharging pipe, and on the discharging side of cylinder assembly are set a discharging honeycomb duct connecting the discharging pipe, guiding the discharged coolant air to the discharging pipe. This invention also provides a silencing device used for said air-out structure, setting in the discharging side of the compressing space, and in the outlet there is a discharging honeycomb duct with a certain length and bore diameter. The discharging honeycomb duct is set on the outlet of the silencing device, connecting directly to the discharging pipe, making the hyperthermia coolant air discharging directly to the discharging pipe through honeycomb duct, by which can prevent the super-heated phenomena of the motor part.
Description
Technical field
The present invention is the invention of relevant hermetic motor compressor, and a kind of hermetic motor compressor exhaust structure and silencer thereof particularly are provided, and by compression volume directly is communicated with on outlet pipe, prevents that motor superheating phenomenon under the cold media air influence of discharging from taking place.
Background technique
Usually, hermetic motor compressor possesses press part and electronic portion simultaneously in a shell, and be arranged on air-conditioning or refrigerator etc. and have in the household appliances of refrigerating circuit, be the core component of these household electrical appliances.Advantage such as that this compressor has is attractive in appearance, be provided with easily, but the problem that exists the heat that produces in the motor section to pass to simultaneously to cause in the press part suction efficiency to descend, the high temperature refrigerant gas that also has press part to discharge make electronic the overheated problem that causes electric efficiency to descend.
Below, horizontal hermetic motor compressor is described.
Fig. 1 is horizontal hermetic motor compressor one embodiment's sectional arrangement drawing of conventional art.Fig. 2 is a cold media air exhaust process sectional arrangement drawing in the horizontal hermetic motor compressor of conventional art.As shown in the figure, the horizontal hermetic motor compressor of conventional art includes electronic portion, and press part is formed.Electronic portion is arranged on shell 1 one sides that are communicated with sucking pipe (figure slightly) and outlet pipe DP, produces power.Press part is connected the rotor (Mr) of electronic opposite side, sucks fluid and the discharge of compression back.
Shell 1 has drum and parallel to the ground, cross setting.Shell 1 is by housing main body 1a right side cover 1b, and left side cover 1c forms.Electronic and press part are set in the inside of housing main body 1a, and the side of 1b covering shell main body 1a is covered on the right side, and in the center portion outlet pipe DP is set, the opposite side of left side cover 1c covering shell main body 1a.
Electronic portion reaches the rotor Mr that rotatably is arranged on stator Ms inboard by the stator Ms that is arranged on shell 1 one sides (right side in the accompanying drawing) and forms.
Press part has the cylinder 2 that is fixed on shell 1 one sides by having certain inner space V and having cylinder assembly in the cylinder assembly; Be assembled in the both sides of cylinder 2 respectively, form the 1st shaft bearing plate 3A and the 2nd shaft bearing plate 3B of cylinder assembly; Possess a plurality of blade parts 4, the inner space V of cylinder assembly is divided into a plurality of enclosed spaces also the rotating shaft 4 of the power of electronic portion biography to press part; Contact in the both sides of rotating shaft 4 blade part 4C respectively and when rotating shaft 4 rotations each space S 1, S2 is transformed into the 1st impeller 5A and the 2nd impeller 5B in air-breathing field and exhaust field; Each impeller 5A, the impeller spring 6 of 5B elastic support; Be arranged on the peripheral surface of the 1st shaft bearing plate 3A and the 2nd shaft bearing plate 3B and to each space S 1, the 1st silencer 7A and the 2nd silencer 7B that the exhaust noise of S2 carries out noise reduction form.
Cylinder 2 has annular shape, and its outer peripheral surface closely contacts and is fixed on the inner peripheral surface of shell 1.In the center portion of cylinder 2, run through the formation space portion.Space portion and each shaft bearing plate 3A, 3B forms inner space V together.Edge part at cylinder 2 forms a plurality of pore 2a and a plurality of oilhole 2b respectively.Each enclosed space S1, the pressurized gas that S2 discharges is contained in shell 1 interior lubricant oil and flows by oilhole 2b by the left and right sides that pore 2a flow to cylinder 2.
Rotating shaft 4 is by running through the 1st shaft bearing plate 3A and the 2nd shaft bearing plate 3B, and is combined in the axial region 4A that the rotor Mr of electronic portion carries out transmission; Extend to form Lower Half by radial direction, on the bearing surface of the 1st shaft bearing plate 3A and the 2nd shaft bearing plate 3B, slide and support the 4B of bearing portion of above-mentioned bearing surface at axial region 4A; Extend to form on the peripheral surface of the 4B of bearing portion, the blade part 4C that the inner space V of cylinder assembly is divided into the 1st space S 1 and the 2nd space S 2 forms.
The center of the 4B of bearing portion is consistent with the center of axial region 4A, during plane projection and axial region 4A form concentric circle.The diameter of both sides up and down of the 4B of bearing portion is identical, and is that the center is symmetrical with blade part 4C.
The inner peripheral surface sliding contact of the outer peripheral surface of blade part 4C and cylinder 2 has round-shaped during plane projection.During expansion, the bi-side of blade part 4C have same thickness from the inner peripheral surface to the outer peripheral surface, and have sinusoidal wave cam face.
The 1st silencer 7A and the 2nd silencer 7B have annular circular plate shape, and their center portion is given prominence to separately and formed resonant cavity 7a, can put the exhaust port (figure slightly) of each shaft bearing plate 3A, 3B among the resonant cavity 7a into.In the side of each resonant cavity 7a, form pore 7b, the gas by exhaust port is discharged is discharged in the shell 1 by pore 7b.The external diameter of the 1st silencer 7A and the 2nd silencer 7B is littler than the external diameter of cylinder 2, so that place the oilhole 2a inboard of cylinder 2.
Unaccounted symbol 4a is an oil circuit among the figure, and 4b is the oil circuit branch line, and 8A is the oil circuit cover, and 8B is a fuel sucking pipe.
Horizontal hermetic motor compressor work with said structure is as follows.
Connect power supply on electronic, when rotor was rotated, the rotating shaft that is combined on the rotor Mr was rotated by a certain direction.And impeller 5A contacts the left and right sides face at rotating shaft 4 blade part 4C respectively on the 5B.Therefore, impeller 5A, 5B press the height shape of blade part 4C, move back and forth the volume of conversion the 1st space S 1 and the 2nd space S 2 with opposite direction.Thereupon, the 1st space S 1 and the 2nd space S 2 constantly suck new cold media air by sucking pipe (figure slightly), and at the turning effort lower compression refrigerant of rotating shaft 4, when the both sides of blade part 4C protrusion surface arrives drain position, take turns to discharge refrigerant by exhaust port.
Here, cold media air by cylinder 2 the 1st space S 1 and after the exhaust port of the 2nd space S 2 flows into the 1st silencer 7A and the 2nd silencer 7B, by each silencer 7A, each pore 7b of 7B is discharged to shell 1 inside.Afterwards, cold media air flows through the Gap Flow of electronic portion to outlet pipe DP one side, flows to refrigerating circuit.
But under the conventional art, there are the following problems for horizontal hermetic motor compressor.Each space S 1 of cylinder 2 in the compressor, S2 is compressed the cold media air temperature that discharge the back, than the temperature height of electronic portion.When this high temperature refrigerant gas stream is crossed electronic portion and entered outlet pipe DP, cause the overheated of electronic portion easily.Thereby reduction efficiency of motor, and then the performance of reduction compressor.
Summary of the invention
In order to address the above problem, purpose of the present invention prevents electronic overheated problem under the influence of compression volume discharging cold media air for a kind of horizontal hermetic motor compressor exhaust structure and silencer thereof are provided.
For achieving the above object, technological scheme of the present invention provides a kind of hermetic motor compressor exhaust structure, in hermetic motor compressor, include compressor case, electronic and press part composition, shell has certain inside space, the electronic portion that produces rotating force is arranged on enclosure, press part setting with cylinder assembly is portion in the enclosure also, cylinder assembly with cylinder assembly is combined on the rotor of electronic portion, go forward side by side and exercise the eccentric rotary that press part produces compressive force, it is characterized in that: the shell between described electronic and the press part is provided with outlet pipe, and the exhaust honeycomb duct is set at the exhaust side of cylinder assembly, the exhaust honeycomb duct is communicated with outlet pipe, and the cold media air water conservancy diversion that the cylinder assembly compression volume is discharged is in outlet pipe.
A kind of silencer that is used for the hermetic motor compressor exhaust structure also is provided, in hermetic motor compressor, include shell, electronic portion, press part is formed, described shell has certain inside space, the electronic portion that produces rotating force is arranged on enclosure, press part with cylinder assembly is arranged on enclosure, cylinder assembly is combined on the rotor of electronic portion, go forward side by side and exercise the eccentric rotary that press part produces compressive force, compress after in the compression volume of cylinder assembly, sucking cold media air, it is characterized in that: be provided with the silencer that makes the sound attenuation band resonant cavity when discharging refrigerant in the discharge side of compression volume, and have the exhaust honeycomb duct of certain-length and internal diameter in the outlet setting of silencer resonant cavity.
Effect of the present invention is that the mechanism of the hermetic motor compressor exhaust structure that provided and silencer thereof is that outlet at silencer prolongs the exhaust honeycomb duct is set, and directly be connected on the outlet pipe exhaust honeycomb duct, thereby the high temperature refrigerant gas that compression chamber is discharged directly is discharged in the outlet pipe by the exhaust honeycomb duct, can prevent in advance that electronic portion superheating phenomenon under the effect of high temperature refrigerant from producing, and then improve the efficient of electronic portion and the performance of compressor.
Description of drawings
Fig. 1 is horizontal hermetic motor compressor one embodiment's sectional arrangement drawing of conventional art;
Fig. 2 is a cold media air exhaust process sectional arrangement drawing in the horizontal hermetic motor compressor of conventional art;
Fig. 3 is horizontal hermetic motor compressor one embodiment's sectional arrangement drawing of the present invention;
Fig. 4 is a gas body exhaust process sectional arrangement drawing in the horizontal hermetic motor compressor of the present invention;
Fig. 5 is a silencer schematic representation in the horizontal hermetic motor compressor of the present invention;
Fig. 6 is another embodiment's sectional arrangement drawing of horizontal hermetic motor compressor of the present invention.
Among the figure:
10: shell 11: housing main body
12: right side cover 13: the left side cover
21: cylinder assembly 22: cylinder
22a: the 1st pore 22b: logical hydraulic fluid port
23A, 23B: the 1st, 2 shaft bearing plate 23a: axis hole
23b: impeller groove 23c: the 2nd pore
24: rotating shaft 24B: bearing portion
24C: blade part 25A, 25B: the 1st, 2 impeller
26: impeller spring 27A, 27B: the 1st, 2 silencer
27a: resonant cavity 27b: bearing patchhole
27c: impeller runs through groove 28,28A, 28B: exhaust honeycomb duct
DP: outlet pipe
Embodiment
Below, with reference to drawings and Examples hermetic motor compressor exhaust structure provided by the invention and silencer thereof are elaborated.
Fig. 3 is horizontal hermetic motor compressor one embodiment's sectional arrangement drawing provided by the invention.Fig. 4 is a cold media air exhaust process sectional arrangement drawing in the horizontal hermetic motor compressor provided by the invention.Fig. 5 is a silencer schematic representation in the horizontal hermetic motor compressor provided by the invention.Fig. 6 is another embodiment's sectional arrangement drawing of horizontal hermetic motor compressor provided by the invention.
As shown in the figure, horizontal hermetic motor compressor provided by the invention comprises shell 10, electronic and press part composition.Shell 10 is communicated with sucking pipe (figure slightly) and outlet pipe DP, and cross setting.Electronic portion is arranged on a side of shell 10 inside, produces power.Press part is arranged on the inside of shell 10, and is located at electronic opposite side, utilizes the power of electronic portion to suck cold media air and the discharge of compression back.
Shell 10 has drum, and is parallel to the ground, cross setting.Shell 10 is by housing main body 11 right sides cover 12, and left side cover 13 is formed.Electronic and press part are set in the inside of housing main body 11, and between electronic and press part, outlet pipe DP are set.A side of 12 covering shell main bodys 11 is covered on the right side, and the opposite side of 13 covering shell main bodys 11 is covered in the left side.
Electronic portion is made up of stator Ms that is arranged on shell 10 1 sides (right side in the accompanying drawing) and the rotor Mr that rotatably is arranged on stator Ms inboard.
Press part is provided with cylinder assembly, and it includes the around shaping drum 2 that has certain inner space and be fixed on shell 10 opposite sides (left side of accompanying drawing); Be assembled in the both sides of cylinder 2 respectively, cover the inner space of cylinder 22, and form the 1st shaft bearing plate 23A and the 2nd shaft bearing plate 23B of cylinder assembly with cylinder 22; Combine with the rotor Mr of electronic M, rotatably be arranged on the inner space V of cylinder 22, and possess a plurality of blade part 24C, the inner space V of cylinder is divided into the rotating shaft 24 of the 1st space S 1 and the 2nd space S 2; Slidably mode is arranged on the 1st shaft bearing plate 23A and the 2nd shaft bearing plate 23B, and closely contact is in the both sides of rotating shaft 24 blade part 24C respectively, and each space S 1, S2 is transformed into the 1st impeller 25A and the 2nd impeller 25B in air-breathing field and exhaust field when rotating shaft 24 rotations; Each impeller 25A, the impeller spring 26 of 25B elastic support; Be arranged on the peripheral surface of the 1st shaft bearing plate 23A and the 2nd shaft bearing plate 23B, to each space S 1, the 1st silencer 27A and the 2nd silencer 27B that the exhaust noise of S2 carries out noise reduction form.
The center portion of the 1st shaft bearing plate 23A and the 2nd shaft bearing plate 23B forms axis hole 23a, forms radial bearing (radial bearings) face of rotating shaft 24, forms impeller groove 23b around axis hole 23a, inserts and support the 1st impeller 25A and the 2nd impeller 25B.
Press circumferencial direction, with each exhaust port of the 1st shaft bearing plate 23A and the 2nd shaft bearing plate 23B (figure slightly) phase difference be 180 ° position, run through being set to the 2nd pore 23c that axially aligning with the 1st pore 22b respectively.
The center of the 24B of bearing portion is consistent with the center of axial region 24A, during plane projection and axial region 24A form concentric circle.The diameter of both sides up and down of the 24B of bearing portion is identical, and is that the center is symmetrical with blade part 24C.
The inner peripheral surface sliding contact of the outer peripheral surface of blade part 24C and cylinder 22 has round-shaped during plane projection.During expansion, the bi-side of blade part 4C have same thickness from the inner peripheral surface to the outer peripheral surface, and have sinusoidal wave cam face.
The 1st silencer 27A and the 2nd silencer 27B have annular circular plate shape, the outstanding separately resonant cavity 27a that forms in their center portion.Can put each shaft bearing plate 23A among the resonant cavity 27a into, the exhaust port 23c of 23B.In the sympathetic response space of the 1st silencer 27A 27a one side, form the pore that is communicated with exhaust honeycomb duct 28.
On the resonant cavity 27a of the 1st silencer 27A, connection is provided with exhaust honeycomb duct 28.Exhaust honeycomb duct 28, the pressurized gas of discharging by the exhaust port of the 1st shaft bearing plate 23A, directly water conservancy diversion is in outlet pipe DP.As Fig. 4, shown in Figure 5, exhaust honeycomb duct 28 is inserted in the entry end of outlet pipe DP to end after by the hook-like shape bending.
Here, exhaust honeycomb duct 28 is made by soft material, can absorb the vibration that spreads out of in the press part.Also can between exhaust honeycomb duct 28 and outlet pipe DP, damping means be set, or make between exhaust honeycomb duct 28 and the outlet pipe DP and form certain interval, make the end of exhaust honeycomb duct 28 insert outlet pipe DP entrance part.
Be sidelong the into exhaust port of the 2nd shaft bearing plate 23B at one of the 2nd silencer 27B resonant cavity 27a, in opposite side, place the 2nd pore 23c of the 2nd shaft bearing plate 23B, form enclosed space with the 2nd shaft bearing plate 23B, allow the air of discharging flow among the 2nd pore 23c by resonant cavity 27a.
The parts identical with conventional art have used identical symbol.
Horizontal hermetic motor compressor work with said structure is as follows.
On electronic M, connect power supply, when rotor Mr was rotated, the rotating shaft 24 that is combined on the rotor Mr was rotated by a certain direction, and blade part 24C is rotated at the inner space of cylinder 22 V, by intakeport, alternately suck cold media air to the 1st space S 1 and the 2nd space S 2.When the lasting rotation of blade part 24C, cold media air is taken turns to discharge by the exhaust port of each space S 1, S2 by each impeller 25A, 25B compression afterwards.
From the cold media air that the 1st space S 1 is discharged by the exhaust port of the 1st shaft bearing plate 23A, flow through the resonant cavity 27a of the 1st silencer 27A after, directly discharge by exhaust honeycomb duct 28 to outlet pipe DP.From the cold media air of the 2nd space S 2 by the exhaust port discharge of the 2nd shaft bearing plate 23B, after flowing through the resonant cavity 27a of the 2nd silencer 27B, the 2nd pore 23c and the 1st pore 22a of cylinder 22 and the 2nd pore 23c of the 1st shaft bearing plate 23A by the 2nd shaft bearing plate 23B, after flowing to the resonant cavity 27a of the 1st silencer 27A, directly discharge by exhaust honeycomb duct 28 to outlet pipe DP with the cold media air that the 1st space S 1 is discharged.
Like this, the high temperature refrigerant of discharging after each space compression of cylinder, utilize the exhaust honeycomb duct directly to arrange in refrigerating circuit, thereby can prevent that electronic portion from superheat state occurring under the influence of cold media air, improve the efficient of electronic portion, and then improve the performance of hermetic motor compressor.
To another embodiment of hermetic motor compressor exhaust structure provided by the invention, be described as follows.
Among the aforesaid embodiment, 28 of exhaust honeycomb ducts are arranged on the 1st silencer 27A, and the cold media air that the 2nd space S 2 is discharged, the 2nd pore 23c, the 1st pore 22a of cylinder 22, the 2nd pore 23c of the 1st shaft bearing plate 23A by the 2nd shaft bearing plate 23B, flow among the 1st silencer 27A, the cold media air of discharging with the 1st space flows to the exhaust honeycomb duct.But among another embodiment, on the 1st silencer 27A and the 2nd silencer 27B, exhaust honeycomb duct 28A is set respectively, 28B, and each exhaust honeycomb duct 28A, the 28B end is connected in parallel on the outlet pipe DP, discharges cold media air.
At this moment, under the cold media air under the condition of high temperature and electronic the discontiguous situation, directly arrange to outlet pipe DP, can prevent the overheated of electronic portion by exhaust honeycomb duct 28A, 28B.Compare with the 1st embodiment, though increase exhaust honeycomb duct 28A in this example, the quantity of 28B need not form the 1st pore 22a and the 2nd pore 23c on shaft bearing plate 23A, the 23B of cylinder 22 both sides.Thereby processing and assembling procedure have been simplified.This example has also been simplified the refrigerant drain passageway, helps reducing the leakage of cold media air.In addition, can the exhaust honeycomb duct that be communicated with silencer directly be connected on the outlet pipe, but allow it extend to enclosure.At this moment, flow through the cold media air of silencer, flow to broad enclosure by long narrow exhaust honeycomb duct.Under " Helmholtz's effect " effect, can more effectively reduce the noise of characteristic frequency in this structure.
The exhaust honeycomb duct is here made by flexible material, can absorb the vibration that spreads out of in the press part.Also can between exhaust honeycomb duct and outlet pipe damping means be set, or make between exhaust honeycomb duct and the outlet pipe and form certain interval, the end that makes the exhaust honeycomb duct is in the contactless insertion of outlet pipe entrance part.
More than, be example by horizontal hermetic motor compressor, describe the present invention.But the present invention also goes for the vertical type hermetic motor compressor, also can be useful in the compressor of other types such as rotary compressor.
Claims (8)
1, a kind of hermetic motor compressor exhaust structure, in hermetic motor compressor, include compressor case, electronic and press part composition, shell has certain inside space, the electronic portion that produces rotating force is arranged on enclosure, press part setting with cylinder assembly is portion in the enclosure also, cylinder assembly with cylinder assembly is combined on the rotor of electronic portion, go forward side by side and exercise the eccentric rotary that press part produces compressive force, it is characterized in that: the shell between described electronic and the press part is provided with outlet pipe, and the exhaust honeycomb duct is set at the exhaust side of cylinder assembly, the exhaust honeycomb duct is communicated with outlet pipe, and the cold media air water conservancy diversion that the cylinder assembly compression volume is discharged is in outlet pipe.
2, hermetic motor compressor exhaust structure according to claim 1, it is characterized in that: on described cylinder assembly, be provided with more than one compression volume, and be provided with therein that the discharge side of each compression volume is come over and pledged allegiance to is the exhaust passageway of a side, and the exhaust honeycomb duct is set separately at the outlet side of exhaust passageway.
3, hermetic motor compressor exhaust structure according to claim 2 is characterized in that: each compression volume at cylinder assembly is discharged side, and silencer is set respectively, selects one in the outlet of silencer the exhaust honeycomb duct is set.
4, hermetic motor compressor exhaust structure according to claim 1 is characterized in that: be provided with an above compression volume on cylinder assembly, and in the discharge side of each compression volume independently exhaust honeycomb duct be set respectively.
5, hermetic motor compressor exhaust structure according to claim 4 is characterized in that: each compression volume at cylinder assembly is discharged side, silencer is set respectively, and in the outlet of silencer the exhaust honeycomb duct is set respectively.
6, according to claim 1 or 2 or 3 or 4 or 5 described hermetic motor compressor exhaust structures, it is characterized in that: described exhaust honeycomb duct is to be made by the elastic material that absorbs the press part vibration.
7, a kind of hermetic motor compressor silencer, in hermetic motor compressor, include shell, electronic portion, press part is formed, described shell has certain inside space, the electronic portion that produces rotating force is arranged on enclosure, press part with cylinder assembly is arranged on enclosure, cylinder assembly is combined on the rotor of electronic portion, go forward side by side and exercise the eccentric rotary that press part produces compressive force, compress after in the compression volume of cylinder assembly, sucking cold media air, it is characterized in that: be provided with the silencer that makes the sound attenuation band resonant cavity when discharging refrigerant in the discharge side of compression volume, and have the exhaust honeycomb duct of certain-length and internal diameter in the outlet setting of silencer resonant cavity.
8, hermetic motor compressor exhaust structure according to claim 7 is characterized in that: described exhaust honeycomb duct is made by the elastic material that absorbs the press part vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410019404 CN1704607A (en) | 2004-05-27 | 2004-05-27 | Hermetic compressor exhaust structure and silencer thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410019404 CN1704607A (en) | 2004-05-27 | 2004-05-27 | Hermetic compressor exhaust structure and silencer thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1704607A true CN1704607A (en) | 2005-12-07 |
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ID=35576692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410019404 Pending CN1704607A (en) | 2004-05-27 | 2004-05-27 | Hermetic compressor exhaust structure and silencer thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1704607A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101326370B (en) * | 2005-12-27 | 2012-04-04 | 大金工业株式会社 | Rotary compressor |
-
2004
- 2004-05-27 CN CN 200410019404 patent/CN1704607A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101326370B (en) * | 2005-12-27 | 2012-04-04 | 大金工业株式会社 | Rotary compressor |
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Open date: 20051207 |