CN106194755B - Screw compressor - Google Patents
Screw compressor Download PDFInfo
- Publication number
- CN106194755B CN106194755B CN201610841977.5A CN201610841977A CN106194755B CN 106194755 B CN106194755 B CN 106194755B CN 201610841977 A CN201610841977 A CN 201610841977A CN 106194755 B CN106194755 B CN 106194755B
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- CN
- China
- Prior art keywords
- intubation
- expansion cavity
- silencing apparatus
- screw compressor
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
- F04C29/065—Noise dampening volumes, e.g. muffler chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
- F04C18/0223—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving with symmetrical double wraps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
- F04C29/068—Silencing the silencing means being arranged inside the pump housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
Abstract
The invention discloses a kind of screw compressors, belong to Compressor Technology field, are designed to solve the problems such as existing apparatus noise elimination effect is poor.Screw compressor of the present invention includes quiet disk and head cover, and expansion cavity is formed between quiet disk and head cover, Jing Panshang is provided with silencing apparatus, silencing apparatus holds together to be formed lower expansion cavity with quiet armor, and the space of the lower expansion cavity of expansion cavity removal forms expansion cavity；At least one through-hole, the upper expansion cavity of through-hole connection and lower expansion cavity are provided on silencing apparatus.Screw compressor of the present invention eliminates noise elimination low ebb frequency by increasing expansion cavity quantity, improves the sound deadening capacity of screw compressor, achievees the purpose that reduce compressor noise, solves the problems, such as that screw compressor exhaust noise is excessive；The silencing apparatus can reduce the noise that high-voltage high-speed gas directly impacts the generated vibration of head cover and radiated simultaneously, and then reduce the vibration that head cover is transmitted to surrounding structure.
Description
Technical field
The present invention relates to Compressor Technology field more particularly to a kind of screw compressors.
Background technology
As shown in Figure 1, the exhaust process of existing screw compressor (especially high back pressure screw compressor) is：High pressure it is cold
Medium gas body is directly discharged to the epicoele (expansion cavity 3) that the head cover 2 of quiet disk 1 and compressor is enclosed from the exhaust outlet 11 of quiet disk 1
It is interior, then the cavity of resorption of shell 9 is discharged to by the exhaust passage 10 that quiet disk 1, upper bracket 8 and shell 9 form, by 20 row of exhaust pipe
Go out, direction shown in arrow is airflow direction in Fig. 1.
There are pressure fluctuations when high pressure gas is discharged from exhaust outlet 11, to generate noise；The height being discharged from exhaust outlet 11
Pressure high-speed gas can be directly sprayed onto on the head cover 2 of compressor, cause the vibration of head cover 2 and radiated noise.Gas noise and
Head cover vibration radiation noise is the Main Noise Sources of screw compressor.Although the epicoele that quiet disk 1 and head cover 2 form is equivalent to one
Expansion chamber silencer has certain noise elimination effect, but due to the limitation of structure space, frequency of noise elimination and sound deadening capacity are limited,
It can not solve the problems, such as that screw compressor pneumatic noise and vibration radiation noise are big；Expansion cavity length mainly influences the maximum of epicoele
Frequency of noise elimination, the bandwidth lost by frequency (i.e. noise elimination low ebb frequency) and transmission, but due to structural volume and design requirement
Limitation, cause the sound deadening capacity of epicoele and frequency of noise elimination very limited；Although the noise elimination structure of epicoele has centainly exhaust noise
Reduction effect, but eliminate the noise through frequency (noise elimination low ebb) due to existing, cause the noise elimination effect of epicoele very limited.
Invention content
It is an object of the invention to propose a kind of screw compressor that can improve sound deadening capacity.
For this purpose, the present invention uses following technical scheme：
A kind of screw compressor, including quiet disk and head cover form expansion cavity between the quiet disk and head cover, in the quiet disk
On be provided with silencing apparatus, the silencing apparatus holds together to be formed lower expansion cavity with the quiet armor, under the expansion cavity removal is described
The space of expansion cavity forms expansion cavity；At least one through-hole is provided on the silencing apparatus, the through-hole is connected on described
Expansion cavity and the lower expansion cavity.
In particular, the silencing apparatus is the barrel-like structure tipped upside down on the quiet disk top surface, the through-hole is opened in institute
It states on the bottom surface of barrel-like structure；It is provided with the intubation of hollow tubular in the through-hole, one end of the intubation protrudes from described
Medial surface, the other end of the bottom surface of silencing apparatus protrude from the lateral surface of the bottom surface of the silencing apparatus.
Further, it is described intubation be located at the upper expansion cavity in part be bend pipe and/or it is described intubation be located at it is described under
Part in expansion cavity is bend pipe.
In particular, the barrel-like structure in the silencing apparatus is internally provided with shelf, the shelf, the intubation and described
Silencing apparatus crowds around to form closing chamber；The intubation opens up at least one intubation ventilation on the tube wall of the closing chamber range
Hole, the intubation venthole are connected to the inner cavity of the closing chamber and the intubation.
In particular, the barrel-like structure in the silencing apparatus is internally provided with shelf, the shelf, the intubation and described
Silencing apparatus crowds around to form closing chamber；Shelf venthole is provided on the shelf, the shelf venthole is connected to the closing
Chamber and the lower expansion cavity.
Further, the intubation opens up at least one intubation venthole on the tube wall of the closing chamber range, described
Intubation venthole is connected to the inner cavity of the closing chamber and the intubation.
In particular, the intubation is welded in the through-hole or the intubation is interference fitted with the through-hole.
In particular, the height for being intubated the inside bottom surface face for protruding from the silencing apparatus is the height of the lower expansion cavity
Spend H 0.25 times or 0.5 times；And/or the height for being intubated the outer side bottom surface face for protruding from the silencing apparatus is on described
0.25 times or 0.5 times of the height L of expansion cavity.
In particular, all the cross-sectional area sum of the through-hole is more than or equal to the cross section of the exhaust outlet on the quiet disk
Product.
In particular, the through-hole is located at the node location of the glottis neoplasms of the lower expansion cavity.
Expansion cavity is partitioned into the lower expansion cavity being connected and upper expansion cavity by the silencing apparatus of screw compressor of the present invention,
Noise elimination low ebb frequency is eliminated by increasing expansion cavity quantity, improves the sound deadening capacity of screw compressor, reaching, which reduces compressor, makes an uproar
The purpose of sound solves the problems, such as that screw compressor exhaust noise is excessive；The silencing apparatus can reduce high-voltage high-speed gas simultaneously
Body directly impacts vibration and the noise radiated caused by head cover, and then reduces the vibration that head cover is transmitted to surrounding structure.
Description of the drawings
Fig. 1 is the sectional view of existing screw compressor；
Fig. 2 is the sectional view for the screw compressor that the preferred embodiment of the present invention one provides；
Fig. 3 is the sectional view of the first structure of the screw compressor that the preferred embodiment of the present invention two provides；
Fig. 4 is the sectional view of second of structure of the screw compressor that the preferred embodiment of the present invention two provides；
Fig. 5 is the sectional view for the screw compressor that the preferred embodiment of the present invention three provides；
Fig. 6 is the partial enlarged view at A in Fig. 5；
Fig. 7 is the sectional view for the screw compressor that the preferred embodiment of the present invention four provides；
Fig. 8 is the partial enlarged view at B in Fig. 7.
In figure：
1, quiet disk；2, head cover；3, expansion cavity；4, silencing apparatus；5, it is intubated；6, shelf；7, closing chamber；8, upper bracket；9、
Shell；10, exhaust passage；11, exhaust outlet；20, exhaust pipe；31, upper expansion cavity；32, lower expansion cavity；41, through-hole；51, bend pipe；
52, it is intubated venthole；61, shelf venthole.
Specific implementation mode
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
Preferred embodiment one：
This preferred embodiment discloses a kind of screw compressor.As shown in Fig. 2, the screw compressor includes quiet disk 1 and head cover
2, expansion cavity 3 is formed between quiet disk 1 and head cover 2, and silencing apparatus 4 is provided on quiet disk 1, is adopted between silencing apparatus 4 and quiet disk 1
It is fixedly connected with modes such as screws.Silencing apparatus 4 crowds around to form lower expansion cavity 32 with quiet disk 1, expansion cavity 32 under the removal of expansion cavity 3
Space form expansion cavity 31；At least one through-hole 41 is provided on silencing apparatus 4, through-hole 41 is connected to upper expansion cavity 31 under
Expansion cavity 32.
Expansion cavity 3 on quiet disk 1 is separated into two chambers by the silencing apparatus 4, arrow institute in gas flow such as Fig. 2
Show, gas pressure pulsation reduces the high-voltage high-speed gas being discharged from the exhaust outlet 11 of quiet disk 1 after lower expansion cavity 32, noise drops
Low, which is discharged to upper expansion cavity 31 by through-hole 41 again, and pressure fluctuation smaller gas vibrates when being sprayed onto the head cover 2 of compressor
Also can reduce, correspondingly radiated noise reduces, the exhaust passage that then air-flow is made up of quiet disk 1, upper bracket 8 and shell 9 again
10 are discharged to the cavity of resorption of shell 9, are discharged by exhaust pipe 20.Quantity by increasing expansion cavity eliminates the low ebb frequency of silencer
Rate has achieved the purpose that improve compressor sound deadening capacity.
Original expansion cavity 3 is divided into two concatenated expansion chambers cavitys, lower expansion cavity 32 and upper expansion cavity by silencing apparatus 4
31 height is different.Correspondingly, the part noise elimination low ebb frequency of silencing apparatus 4 can change, and reduce part in the prior art
The noise of noise elimination low ebb frequency.Wherein, the design of the height L of the height H and upper expansion cavity 31 of lower expansion cavity 32 is mainly according to row
The peak value frequency range of gas noise is designed, and the height H of lower expansion cavity 32 is greater than 31 height L of expansion cavity.
The part low ebb frequency that silencing apparatus 4 can only be cut down in view of the quantity for increasing expansion cavity, in order to preferably cut down more
Interpolation pipe can be respectively set in lower expansion cavity 32 and upper expansion cavity 31 in more low ebb frequencies；Can also be：Silencing apparatus 4 is
The barrel-like structure on 1 top surface of quiet disk is tipped upside down on, through-hole 41 is opened on the bottom surface of barrel-like structure, is provided in through-hole 41 hollow
The intubation 5 of tubulose, intubation 5 are welded in through-hole 41 or are interference fitted with through-hole 41, and the one end for being intubated 5 protrudes from silencing apparatus 4
Bottom surface medial surface, the other end protrude from silencing apparatus 4 bottom surface lateral surface.
The length of 5 insertion expansion cavity of intubation is mainly determined according to the crest frequency of the exhaust noise to be eliminated, excellent
Choosing, the height that intubation 5 protrudes from the inside bottom surface face of silencing apparatus 4 is 0.25 times or 0.5 of the height H of lower expansion cavity 32
Times, specifically 0.25 times or 0.5 times will then be selected according to frequency of noise elimination；And/or intubation 5 protrudes from silencing apparatus 4
The height in outer side bottom surface face is 0.25 times or 0.5 times of the height L of upper expansion cavity 31, and specifically 0.25 times or 0.5 times is then wanted
It is selected according to frequency of noise elimination.
The shape and quantity of intubation 5 are unlimited, can carry out reasonable disposition according to deadening frequency band.The cross section shape of intubation 5
Shape can be the shapes such as round, ellipse and rectangle；Intubation 5 quantity be no less than one in the case of, it is all intubation 5 it is transversal
The sum of area is more than or equal to the cross-sectional area of exhaust outlet 11, to reduce airflow pressure losses.
At the node location for the glottis neoplasms that through-hole 41 (and intubation 5) is located at lower expansion cavity 32.The node in different product
Position is possible to different, needs to carry out acoustics emulation in advance to determine the node location.
Preferred embodiment two：
This preferred embodiment discloses a kind of screw compressor, and structure and preferred embodiment one are essentially identical.Difference
It is, as shown in figure 3, it is bend pipe 51 that intubation 5, which is located at the part in lower expansion cavity 32,；As shown in figure 4, intubation 5 is located at upper expansion
Part in chamber 31 is bend pipe 51.Limited in 1 superjacent air space of quiet disk, 51 structure of bend pipe ensures that intubation 5 still can be with
It is rationally designed according to the requirement of deadening frequency band, guarantee has enough sound deadening capacities；In addition, 51 structure of bend pipe can reduce whirlpool
Rotation compressor spits oil cut rate.
Preferred embodiment three：
This preferred embodiment discloses a kind of screw compressor, and structure is essentially identical with preferred embodiment one or two.It is different
Place is, as shown in Figure 5 and Figure 6, is internally provided with shelf 6 in the barrel-like structure of silencing apparatus 4, shelf 6 is intubated 5 and disappears
Acoustic device 4 crowds around to form closing chamber 7；Intubation 5, which is located on the tube wall of 7 range of closing chamber, opens up at least one intubation venthole 52,
It is intubated the inner cavity that venthole 52 is connected to closing chamber 7 and intubation 5.The structure forms the resonant cavity of multiple parallel connections, greatly widens and disappears
Audio frequency range improves the sound deadening capacity of screw compressor.
Preferred embodiment four：
This preferred embodiment discloses a kind of screw compressor, and structure and preferred embodiment three are essentially identical.Difference
It is, is internally provided with shelf 6 in the barrel-like structure of silencing apparatus 4, shelf 6, intubation 5 and silencing apparatus 4 crowd around to form closing
Chamber 7；Shelf venthole 61 is provided on shelf 6, shelf venthole 61 is connected to closing chamber 7 and lower expansion cavity 32.
On the basis of above structure, as shown in Figure 7 and Figure 8, the tube wall of 7 range of closing chamber can also be located in intubation 5
On open up at least one intubation venthole 52, intubation venthole 52 is connected to the inner cavity of closing chamber 7 and intubation 5.The structure forms more
The resonant cavity of a parallel connection, the sound deadening capacity further widened deadening frequency band, improve screw compressor.
Note that the technical principle that above are only presently preferred embodiments of the present invention and used.Those skilled in the art can manage
Solution, the present invention is not limited to specific embodiments described here, can carry out various apparent changes for a person skilled in the art
Change, readjust and substitutes without departing from protection scope of the present invention.Therefore, although by above example to the present invention into
It has gone and has been described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept,
Can also include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (7)
1. a kind of screw compressor, including quiet disk（1）And head cover（2）, the quiet disk（1）With the head cover（2）Between formed expand
Open chamber（3）, which is characterized in that in the quiet disk（1）On be provided with silencing apparatus（4）, the silencing apparatus（4）With the quiet disk
（1）It crowds around to form lower expansion cavity（32）, the expansion cavity（3）Remove the lower expansion cavity（32）Space form expansion cavity
（31）；The silencing apparatus（4）On be provided at least one through-hole（41）, the through-hole（41）It is connected to the upper expansion cavity（31）
With the lower expansion cavity（32）；
The silencing apparatus（4）To tip upside down on the quiet disk（1）Barrel-like structure on top surface, the through-hole（41）It is opened in described
On the bottom surface of barrel-like structure；In the through-hole（41）Inside it is provided with the intubation of hollow tubular（5）, the intubation（5）One end it is convex
For the silencing apparatus（4）Medial surface, the other end of bottom surface protrude from the silencing apparatus（4）Bottom surface lateral surface；
All through-holes（41）Cross-sectional area sum be more than or equal to the quiet disk（1）On exhaust outlet（11）Cross-sectional area；Institute
State through-hole（41）Positioned at the lower expansion cavity（32）Glottis neoplasms node location at.
2. screw compressor according to claim 1, which is characterized in that the intubation（5）Positioned at the upper expansion cavity
（31）Interior part is bend pipe（51）And/or the intubation（5）Positioned at the lower expansion cavity（32）Interior part is bend pipe
（51）.
3. screw compressor according to claim 1, which is characterized in that in the silencing apparatus（4）Barrel-like structure in
Portion is provided with shelf（6）, the shelf（6）, the intubation（5）With the silencing apparatus（4）It crowds around to form closing chamber（7）；Institute
State intubation（5）Positioned at the closing chamber（7）At least one intubation venthole is opened up on the tube wall of range（52）, the intubation ventilation
Hole（52）It is connected to the closing chamber（7）With the intubation（5）Inner cavity.
4. screw compressor according to claim 1, which is characterized in that in the silencing apparatus（4）Barrel-like structure in
Portion is provided with shelf（6）, the shelf（6）, the intubation（5）With the silencing apparatus（4）It crowds around to form closing chamber（7）；Institute
State shelf（6）On be provided with shelf venthole（61）, the shelf venthole（61）It is connected to the closing chamber（7）With the lower expansion
Open chamber（32）.
5. screw compressor according to claim 4, which is characterized in that the intubation（5）Positioned at the closing chamber（7）Model
At least one intubation venthole is opened up on the tube wall enclosed（52）, the intubation venthole（52）It is connected to the closing chamber（7）And institute
State intubation（5）Inner cavity.
6. screw compressor according to any one of claim 1 to 5, which is characterized in that the intubation（5）It is welded on institute
State through-hole（41）The interior or described intubation（5）With the through-hole（41）Interference fit.
7. screw compressor according to any one of claim 1 to 5, which is characterized in that the intubation（5）Protrude from institute
State silencing apparatus（4）Inside bottom surface face height be the lower expansion cavity（32）0.25 times or 0.5 times of height H；
And/or the intubation（5）Protrude from the silencing apparatus（4）Outer side bottom surface face height be the upper expansion cavity
（31）0.25 times or 0.5 times of height L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610841977.5A CN106194755B (en) | 2016-09-21 | 2016-09-21 | Screw compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610841977.5A CN106194755B (en) | 2016-09-21 | 2016-09-21 | Screw compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106194755A CN106194755A (en) | 2016-12-07 |
| CN106194755B true CN106194755B (en) | 2018-09-11 |
Family
ID=58067097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610841977.5A Active CN106194755B (en) | 2016-09-21 | 2016-09-21 | Screw compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106194755B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210090449A (en) * | 2020-01-10 | 2021-07-20 | 엘지전자 주식회사 | A compressor |
| FR3129693A1 (en) | 2021-11-26 | 2023-06-02 | Danfoss Commercial Compressors | A scroll compressor provided with a discharge silencer arrangement |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2484419Y (en) * | 2001-02-27 | 2002-04-03 | 杨天福 | Vortex compressor |
| US8950081B2 (en) * | 2011-06-17 | 2015-02-10 | Emerson Climate Technologies, Inc. | Compressor dehydration via sorbent technology |
| JP5861035B2 (en) * | 2011-10-26 | 2016-02-16 | パナソニックＩｐマネジメント株式会社 | Compressor |
| CN204283558U (en) * | 2014-12-11 | 2015-04-22 | 安徽江淮汽车股份有限公司 | A kind of exhaust silencer composition |
| CN206206181U (en) * | 2016-09-21 | 2017-05-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Screw compressor |
-
2016
- 2016-09-21 CN CN201610841977.5A patent/CN106194755B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106194755A (en) | 2016-12-07 |
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