CN106246557A - Ventilation type vacuum pump set noise-and-vibration-reduction mechanism - Google Patents
Ventilation type vacuum pump set noise-and-vibration-reduction mechanism Download PDFInfo
- Publication number
- CN106246557A CN106246557A CN201610681151.7A CN201610681151A CN106246557A CN 106246557 A CN106246557 A CN 106246557A CN 201610681151 A CN201610681151 A CN 201610681151A CN 106246557 A CN106246557 A CN 106246557A
- Authority
- CN
- China
- Prior art keywords
- vacuum pump
- pump set
- vibration
- noise
- reduction mechanism
- 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.)
- Pending
Links
Classifications
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The present invention relates to a kind of noise-and-vibration-reduction mechanism.It is more particularly related to a kind of ventilation type vacuum pump set noise-and-vibration-reduction mechanism, including: vacuum pump set, it has at least one import allowing cooling gas to enter and the outlet allowing its internal high-temperature gas to discharge；First sound attenuation assembly, its outlet and the inlet communication of described vacuum pump set, to be delivered to the cooling gas through noise reduction process inside described vacuum pump set；Second sound attenuation assembly, its import and the outlet of described vacuum pump set, downstream export after carrying out noise reduction process with the high-temperature gas by the work generation of described vacuum pump set.Present invention reduces noise during vacuum pump set work, decrease vibration, and then decrease the harm to health of human body, extend the service life of equipment.
Description
Technical field
The present invention relates to a kind of noise-and-vibration-reduction mechanism.It is more particularly related to a kind of ventilation type vacuum pump set fall
Make an uproar damper mechanism.
Background technology
Vacuum technique is widely used in each row such as Aero-Space, mechano-electronic, non-ferrous metal, rare earth permanent magnet, medicine manufacture
Each industry, has promoted the development of modern science technological progress and industrial or agricultural.Roots vacuum system is as a kind of important vacuum equipment
Being used widely, it has the advantages such as rotating speed is high, volume is little, it is achieved after air cooling, Roots vacuum system can be at elevated pressures
Continuously work and not overtemperature.
Ventilation type Roots vacuum system has been applied in Aero-Space simulation experiment, in arc-heated wind tunnel system at present
Undertake gas and extract task.The vacuum system used in arc-heated wind tunnel includes some vacuum pump set, vacuum pipe, vacuum
Valve and Dewar vessel and auxiliary device, structure is complicated, and system is huge, and noise that vacuum pump set produces in running and vibration are to week
Collarette border is formed pollutes, harm health of human body and equipment safety.
Summary of the invention
It is an object of the invention to solve at least the above, and the advantage that at least will be described later is provided.
Noise when a further object of the invention is to reduce vacuum pump set work, reduces vibration, and then reduces the person
Healthy harm, the service life of extension device.
In order to realize object of the present invention and further advantage, it is provided that a kind of ventilation type vacuum pump set noise-and-vibration-reduction machine
Structure, including:
Vacuum pump set, it has at least one import allowing cooling gas to enter and the High Temperature Gas allowing its inside
The outlet that body is discharged；
First sound attenuation assembly, its outlet and the inlet communication of described vacuum pump set, with by the cooling gas through noise reduction process
Body is delivered to inside described vacuum pump set；
Second sound attenuation assembly, its import and the outlet of described vacuum pump set, produce to be worked by described vacuum pump set
High-temperature gas carry out noise reduction process after downstream export.
Preferably, in described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, a damping assembly, described damping are also included
Assembly is arranged on the bottom of described vacuum pump set, the vibration produced during in order to absorb the work of described vacuum pump set.
Preferably, in described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, described damping assembly includes that one is fixed
Platform bottom described vacuum pump set and be arranged on the multiple vibroshocks below described platform.
Preferably, in described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, described first sound attenuation assembly includes first
The outlet of described first acoustic filter of acoustic filter, aspirating air pipe and connection and the connector of the import of described aspirating air pipe, described suction
The outlet of feed channel is connected to the import of described vacuum pump set.
Preferably, in described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, described aspirating air pipe includes two in opposite directions
The C font pipeline arranged, the import of two C font pipelines is connected with described connector respectively, and the outlet of two C font pipelines divides
It is not connected to the Liang Ge import department of described vacuum pump set.
Preferably, in described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, described connector is threeway, described threeway
The outlet with the import of two C font pipelines and described first acoustic filter respectively of three openings be connected.
Preferably, in described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, described first acoustic filter, aspirating air pipe and
Connector is anticorrosion material.
Preferably, in described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, non-filler in described first acoustic filter.
Preferably, in described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, described second sound attenuation assembly includes second
The import of acoustic filter and described second acoustic filter of connection and the discharge duct of the outlet of described vacuum pump set.
Preferably, in described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, described second acoustic filter and described aerofluxus
Pipeline is high temperature resistant, anticorrosion material.
The present invention at least includes following beneficial effect: owing to the aspirating air pipe of vacuum pump set both sides is realized also by threeway
Connection, the air-flow in two aspirating air pipes cancels each other in threeway, reduces the noise that airflow scouring causes；Due to threeway upstream
It is mounted with suitable first acoustic filter, reduces the noise that air-breathing causes, and non-filler in acoustic filter, it is to avoid vacuum pump set
Blockage problem.Owing to the second sound attenuation assembly being mounted with suitable second acoustic filter, significantly reduce the noise that aerofluxus causes；
And owing to the second acoustic filter has enough intensity, it is to avoid in exhaust process, the second acoustic filter produces knot under pressure
Structure unstability；It addition, the enough heat resistance of the second acoustic filter avoids in exhaust process the second acoustic filter under temperature action
Produce structural instability.Due to the suitable vibroshock of stage+module of damping assembly, effectively reduce vibration, and reduce and shake
The dynamic noise caused.Two groups of sound attenuation assemblies and one group of damping assembly cooperate, and reduce noise during vacuum pump set work, subtract
Lack vibration, and then decreased the harm to health of human body, extend the service life of equipment.
Part is embodied by the further advantage of the present invention, target and feature by description below, and part also will be by this
Invention research and practice and be understood by the person skilled in the art.
Accompanying drawing explanation
Fig. 1 is the structural representation of the ventilation type vacuum pump set noise-and-vibration-reduction mechanism of the present invention；
Fig. 2 is the structural representation of first sound attenuation assembly of the present invention；
Fig. 3 is the structural representation of second sound attenuation assembly of the present invention；
Fig. 4 is the structural representation of the damping assembly of the present invention.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to description literary composition
Word can be implemented according to this.
Should be appreciated that used herein such as " have ", " comprising " and " including " term do not allot one or many
Other element individual or the existence of a combination thereof or interpolation.
As it is shown in figure 1, the present invention provides a kind of ventilation type vacuum pump set noise-and-vibration-reduction mechanism, belong to vacuum technique application neck
Territory, including:
Vacuum pump set 1, it has at least one import 11 allowing cooling gas to enter and the height allowing its inside
The outlet 12 that wet body is discharged.Import is arranged on the sidewall of vacuum pump set, and outlet is arranged on the diapire of vacuum pump set.
First sound attenuation assembly 2, its outlet 21 and the inlet communication of described vacuum pump set, with by the cooling through noise reduction process
Gas is delivered to inside described vacuum pump set, reduces the noise that air-breathing causes simultaneously.In vacuum pump set works, the first noise elimination group
Part is vacuum pump set conveying cooling gas, and cooling gas is pulsatile flow, produces noise with solid wall surface friction, and noise comprises
Senior middle school's low-frequency noise, selects to tackle each frequency during noise reducing apparatus and all processes.
Second sound attenuation assembly 3, its import 31 and the outlet of described vacuum pump set, produce to be worked by described vacuum pump set
Raw high-temperature gas downstream exports after carrying out noise reduction process, reduces the noise that aerofluxus causes simultaneously.In vacuum pump set works,
Enter the complicated ingredient high-temperature gas of the second sound attenuation assembly from vacuum pump set, gas is pulsatile flow, with solid wall surface friction
Producing noise, noise comprises senior middle school's low-frequency noise, selects to tackle each frequency during noise reducing apparatus and all processes.
It is solid that first sound attenuation assembly and vacuum pump set, fixing connection between the second sound attenuation assembly and vacuum pump set are sealing
Fixed, concrete grammar can be bolt connection or welding etc..
In described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, as it is shown in figure 1, also include a damping assembly 4, described in subtract
Shake assembly is arranged on the bottom of described vacuum pump set, e.g., fixes with the base 13 of vacuum pump set and is connected, in order to absorb described vacuum
The vibration produced during unit work, the noise caused when simultaneously reducing vibration.This is owing to vacuum pump set can produce at work
Regular vibration, needs damping assembly it effectively to be absorbed.
In described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, as shown in figs. 1 and 4, described damping assembly includes one
It is fixed on the platform 41 bottom described vacuum pump set and is arranged on the multiple vibroshocks 42 below described platform.Due to vacuum pump set
And auxiliary device weighs several tons, therefore damping assembly should possess vibration damping and load-bearing property.Platform is the capital equipment of load-bearing, needs
The intensity of platform to be ensured itself and flatness, the concrete model of platform determines according to the weight and volume of carrying vacuum pump set.
Vibroshock is the capital equipment of vibration damping, needs to bear the weight of vacuum pump set and platform simultaneously, needs to ensure vibroshock itself
Intensity, concrete model determines according to the vibration born and weight.
In described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, as illustrated in fig. 1 and 2, described first sound attenuation assembly includes
First acoustic filter 22, aspirating air pipe 23 and connect the outlet of described first acoustic filter and the connector of the import of described aspirating air pipe
24, the outlet of described aspirating air pipe is connected to the import of described vacuum pump set.Between first acoustic filter, aspirating air pipe and connector
Fixing connection to be sealing fixing, concrete grammar can be that bolt connects or welding etc..First acoustic filter is to reduce noise
Capital equipment, should be according to the actual noise group component selections particular type measured and the acoustic filter of model herein.
In described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, as it is shown in figure 1, described aspirating air pipe includes two in opposite directions
The C font pipeline 231 arranged, the import of two C font pipelines is connected with described connector respectively, going out of two C font pipelines
Mouth is respectively connecting to the Liang Ge import department of described vacuum pump set, two C font pipelines and vacuum pump set and forms the annular of a Guan Bi.
Aspirating air pipe is used for providing flow channel for cold airflow, needs to ensure cleaning and the sealing of aspirating air pipe itself.Eliminate the noise from first
The cooling gas of output in device achieves a butt joint inside vacuum pump set through the conveying of two C font pipelines, counteracts a part and makes an uproar
Sound.
In described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, as illustrated in fig. 1 and 2, described connector is threeway, described
The outlet with the import of two C font pipelines and described first acoustic filter respectively of three openings of threeway is connected.Threeway is used for
Two C font pipelines and the first acoustic filter being tightly connected, the cold airflow from the first acoustic filter realizes shunting in threeway,
Need to ensure cleaning and the sealing of threeway itself.
In described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, described first acoustic filter, aspirating air pipe and connector are equal
For anticorrosion material, rustless steel or other anticorrosives can be used to make, it is to avoid air-flow to be formed and pollutes.
In described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, non-filler in described first acoustic filter.Due to vacuum
Unit internalized prohibition enters foreign material, therefore must not there is caducous implant in the first acoustic filter, in order to avoid implant is with air-flow
Enter vacuum pump set, result in blockage, affect the properly functioning of vacuum pump set.
In described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, as shown in figs. 1 and 3, described second sound attenuation assembly includes
The import of the second acoustic filter 32 and described second acoustic filter of connection and the discharge duct 33 of the outlet of described vacuum pump set.Second disappears
It is fixing that fixing connection between sound device and discharge duct is sealing, and concrete grammar can be bolt connection or welding etc..Second
Acoustic filter is the capital equipment reducing noise, should disappearing according to the actual noise group component selections particular type measured herein and model
, in the second acoustic filter, also must not there is caducous implant in sound device.Second acoustic filter should possess certain intensity, in order to avoid aerofluxus
During second acoustic filter produce structural instability.Discharge duct is the gas channel of complicated ingredient high-temperature gas, needs to ensure to lead to
The cleaning in road itself and sealing.
In described ventilation type vacuum pump set noise-and-vibration-reduction mechanism, described second acoustic filter and described discharge duct are resistance to
High temperature, anticorrosion material.The gas componant entering the second sound attenuation assembly from vacuum pump set is complicated, miscellaneous with sour gas and dust-like
Matter, gas temperature is at about 100 DEG C, and the second sound attenuation assembly should possess corrosion-resistant, heat resistance.Second acoustic filter and discharge duct
Rustless steel or other anticorrosives is all used to make, it is to avoid air-flow to be formed and pollutes.
When a vacuum system exists some vacuum pump set, often set vacuum pump set should have independent damping assembly, keeps away
Exempt from different unit in identical platform, produce resonance.The present invention provides ventilation type vacuum pump set noise-and-vibration-reduction mechanism can be effective
The noise produced when reducing vacuum pump set work, reduces the vibration that vacuum pump set produces simultaneously, solves what vacuum pump set produced
Noise and vibration produce safely the problem of harm to practitioner's health and equipment, and the long-life operation for vacuum pump set provides
Technical support.
Although embodiment of the present invention are disclosed as above, but it is not restricted in description and embodiment listed
Using, it can be applied to various applicable the field of the invention completely, for those skilled in the art, and can be easily
Realizing other amendment, therefore under the general concept limited without departing substantially from claim and equivalency range, the present invention does not limit
In specific details with shown here as the legend with description.
Claims (10)
1. a ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that including:
Vacuum pump set, it has at least one import allowing cooling gas to enter and a high-temperature gas row allowing its inside
The outlet gone out；
First sound attenuation assembly, its outlet and the inlet communication of described vacuum pump set, with by defeated for the cooling gas through noise reduction process
Deliver to inside described vacuum pump set；
The outlet of the second sound attenuation assembly, its import and described vacuum pump set, with the height work of described vacuum pump set produced
Wet body downstream exports after carrying out noise reduction process.
2. as claimed in claim 1 ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that also include a vibration damping group
Part, described dampening assembly is arranged on the bottom of described vacuum pump set, the vibration produced during in order to absorb the work of described vacuum pump set.
3. as claimed in claim 2 ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that described damping assembly includes
One platform being fixed on bottom described vacuum pump set and be arranged on the multiple vibroshocks below described platform.
4. as claimed in claim 1 ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that described first sound attenuation assembly
Connection including outlet and the import of described aspirating air pipe of described first acoustic filter of the first acoustic filter, aspirating air pipe and connection
Part, the outlet of described aspirating air pipe is connected to the import of described vacuum pump set.
5. as claimed in claim 4 ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that described aspirating air pipe includes
The C font pipeline that two are oppositely arranged, the import of two C font pipelines is connected with described connector respectively, two C font pipelines
Outlet be respectively connecting to the Liang Ge import department of described vacuum pump set.
6. as claimed in claim 5 ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that described connector is three
Logical, the outlet with the import of two C font pipelines and described first acoustic filter respectively of three openings of described threeway is connected.
7. as claimed in claim 4 ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that described first acoustic filter,
Aspirating air pipe and connector are anticorrosion material.
8. as claimed in claim 4 ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that in described first acoustic filter
Non-filler.
9. as claimed in claim 1 ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that described second sound attenuation assembly
The import including the second acoustic filter and connecting described second acoustic filter and the discharge duct of the outlet of described vacuum pump set.
10. as claimed in claim 9 ventilation type vacuum pump set noise-and-vibration-reduction mechanism, it is characterised in that described second acoustic filter
It is high temperature resistant, anticorrosion material with described discharge duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681151.7A CN106246557A (en) | 2016-08-17 | 2016-08-17 | Ventilation type vacuum pump set noise-and-vibration-reduction mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681151.7A CN106246557A (en) | 2016-08-17 | 2016-08-17 | Ventilation type vacuum pump set noise-and-vibration-reduction mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106246557A true CN106246557A (en) | 2016-12-21 |
Family
ID=57593147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610681151.7A Pending CN106246557A (en) | 2016-08-17 | 2016-08-17 | Ventilation type vacuum pump set noise-and-vibration-reduction mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106246557A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10136289A1 (en) * | 2001-07-25 | 2002-02-07 | Robuschi & C Spa | Gas-injection Roots blower is silenced by gas manifolds which are volumetrically-tuned to damp fundamental acoustic frequency generated by rotors |
| CN202091149U (en) * | 2011-05-31 | 2011-12-28 | 深圳市顺速达科技有限公司 | Shockproof compressor device and oxygenerator |
| CN202157965U (en) * | 2011-07-14 | 2012-03-07 | 温州市欧弗斯机械有限公司 | Intelligent regulation vacuum system |
| CN103089624A (en) * | 2011-10-31 | 2013-05-08 | 南通龙鹰真空泵业有限公司 | Roots vacuum pump |
| CN203272148U (en) * | 2013-05-08 | 2013-11-06 | 济南枭龙重工机械有限公司 | Low-noise roots vacuum pump |
| CN203867905U (en) * | 2014-03-21 | 2014-10-08 | 南通龙鹰真空泵业有限公司 | Roots vacuum pump with noise reduction function |
| CN203906276U (en) * | 2014-05-27 | 2014-10-29 | 宜兴优纳特机械有限公司 | Novel intensive complete set type Roots blower unit |
| CN105222980A (en) * | 2015-11-12 | 2016-01-06 | 浙江真空设备集团有限公司 | A kind of wind tunnel body pumped vacuum systems |
| CN105257540A (en) * | 2015-11-05 | 2016-01-20 | 山东三牛机械有限公司 | Double-pole high-pressure dry type roots vacuum pump unit |
| CN205370975U (en) * | 2016-01-22 | 2016-07-06 | 海门市海真真空设备有限公司 | Ventilation type roots vacuum pump |
-
2016
- 2016-08-17 CN CN201610681151.7A patent/CN106246557A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10136289A1 (en) * | 2001-07-25 | 2002-02-07 | Robuschi & C Spa | Gas-injection Roots blower is silenced by gas manifolds which are volumetrically-tuned to damp fundamental acoustic frequency generated by rotors |
| CN202091149U (en) * | 2011-05-31 | 2011-12-28 | 深圳市顺速达科技有限公司 | Shockproof compressor device and oxygenerator |
| CN202157965U (en) * | 2011-07-14 | 2012-03-07 | 温州市欧弗斯机械有限公司 | Intelligent regulation vacuum system |
| CN103089624A (en) * | 2011-10-31 | 2013-05-08 | 南通龙鹰真空泵业有限公司 | Roots vacuum pump |
| CN203272148U (en) * | 2013-05-08 | 2013-11-06 | 济南枭龙重工机械有限公司 | Low-noise roots vacuum pump |
| CN203867905U (en) * | 2014-03-21 | 2014-10-08 | 南通龙鹰真空泵业有限公司 | Roots vacuum pump with noise reduction function |
| CN203906276U (en) * | 2014-05-27 | 2014-10-29 | 宜兴优纳特机械有限公司 | Novel intensive complete set type Roots blower unit |
| CN105257540A (en) * | 2015-11-05 | 2016-01-20 | 山东三牛机械有限公司 | Double-pole high-pressure dry type roots vacuum pump unit |
| CN105222980A (en) * | 2015-11-12 | 2016-01-06 | 浙江真空设备集团有限公司 | A kind of wind tunnel body pumped vacuum systems |
| CN205370975U (en) * | 2016-01-22 | 2016-07-06 | 海门市海真真空设备有限公司 | Ventilation type roots vacuum pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101136731B1 (en) | Method and apparatus for manipulating and diluting internal combustion exhaust gases | |
| CN104533840B (en) | Axial air incoming enclosure of axial-flow compressor | |
| CN205392069U (en) | Waste heat utilization type exhaust purification processing apparatus | |
| CN208772064U (en) | A kind of pipeline deashing accelerator and deduster | |
| CN108945293A (en) | A kind of watercraft engine room Temporary Ventilation method | |
| CN206377805U (en) | A kind of new Wind Engineering mute pipe road system | |
| CN106246557A (en) | Ventilation type vacuum pump set noise-and-vibration-reduction mechanism | |
| CN202560333U (en) | Booster expansion turbine for recovery device in chemical industry | |
| CN205064400U (en) | Ejector and draw system of penetrating for dirty gas | |
| CN105148343B (en) | One kind is used for Nephrology dept.'s peritoneal dialysis locator | |
| CN206944359U (en) | A kind of air-conditioner outdoor unit pipe arrangement and air-conditioner outdoor unit | |
| CN204609978U (en) | Motorcycle silencer | |
| CN106523105A (en) | Connection pipe for connecting an active muffler to an exhaust system for an internal combustion engine | |
| CN203476641U (en) | Low noise pool air pump system | |
| CN102980281A (en) | Double-seal leak-tightness efficient air supply outlet | |
| CN208613332U (en) | A kind of blower exhausting system | |
| CN106321441A (en) | Self-cleaning cooling structure of Roots vacuum unit | |
| CN207363969U (en) | A kind of novel fan silencer | |
| CN207395033U (en) | A kind of center air cleaning system | |
| CN202501161U (en) | Built-in general type noise eliminator of natural gas line | |
| CN206203427U (en) | A kind of wind power transmission device | |
| CN205371932U (en) | Blowpipe silencer | |
| CN209294638U (en) | A kind of Gas Exhausting Muffle | |
| CN207494182U (en) | A kind of efficient metallographical cutter exhaust system | |
| CN107906057A (en) | Muffler without sound-absorbing material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161221 |
|
| RJ01 | Rejection of invention patent application after publication |