CN109555664A - A kind of pre- silencing means and electronic vacuum pump for electronic vacuum pump - Google Patents
A kind of pre- silencing means and electronic vacuum pump for electronic vacuum pump Download PDFInfo
- Publication number
- CN109555664A CN109555664A CN201811479694.6A CN201811479694A CN109555664A CN 109555664 A CN109555664 A CN 109555664A CN 201811479694 A CN201811479694 A CN 201811479694A CN 109555664 A CN109555664 A CN 109555664A
- Authority
- CN
- China
- Prior art keywords
- vacuum pump
- silencing means
- inlet plenum
- electronic vacuum
- elastic
- 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
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0083—Pulsation and noise damping means using blow off silencers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/1013—Adaptations or arrangements of distribution members the members being of the poppet valve type
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The present invention relates to the electronic vacuum pumps of a kind of pre- silencing means for electronic vacuum pump and enhancing noise reduction, by a variety of denoising structures, the multiple Noise Reduction of cooperative achievement, to realize better noise reduction effect.The pre- silencing means, the elastic diaphragm by sealing not aperture separate inlet plenum, surge chamber, prevent the direct impact sound reduction cover of air-flow, achieve the effect that reduce noise.In the pumping of vacuum pump work, elastic diaphragm is heaved under gas shock effect towards surge chamber expansion, and buffer gas flow pulsation slows down the speed that air-flow goes out pump chamber, reduces noise peak, plays the role of assisting noise reduction.Venthole forms circumference uniform distribution along the side wall of inlet plenum, avoids turbulent air flow and generates noise.When vacuum pump stops being evacuated, elastic diaphragm is shunk to inlet plenum, mitigation of gases back-flow velocity, reduces the risk that foreign matter resorption enters pump chamber.Based on the pre- silencing means, the electronic vacuum pump meets the noise requirements of automobile main frame maker.
Description
Technical field
The present invention relates to the electronic vacuum pumps of automotive field, more specifically to a kind of for the pre- of electronic vacuum pump
Silencing means and a kind of electronic vacuum pump for enhancing noise reduction.
Background technique
As regulation steps up automobile fuel consumption and carbon emission requirement, small displacement turbocharged engine and electronic vapour
Vehicle becomes the selection of more and more automobile vendors.
It is equipped with the automobile of small displacement turbocharged engine, vacuum boosting braking system will appear very under certain operating conditions
The situation of reciprocal of duty cycle deficiency, influences traffic safety.At this point, electronic vacuum pump can provide additional vacuum source for it, it is ensured that vacuum
Booster works normally, it is ensured that traffic safety.
It is equipped with the electric vehicle of vacuum boosting braking system, due to not having engine to provide vacuum, needs additional device special
Door provides vacuum, and electronic vacuum pump is a selection well.
But the electronic vacuum pump of the prior art, as shown in Figure 1 and Figure 2, pre- silencer mechanism is a cylindrical rubber
Sleeve, air-flow directly impact top silencer cover after coming out from pump chamber, and noise is directed through silencer cover and enters in outside atmosphere, exists
The larger problem of noise is unable to reach automobile main frame maker to the noise requirements of electronic vacuum pump.
Moreover, after vacuum pump stops working, the negative pressure that generates inside gas outlet is by the water and impurity in wet air
Sucking, one generates noise, and two to cause pump chamber to condense a large amount of water or there are impurity, if pump chamber have water or
Impurity, for blade when running at high speed, these water or impurity will increase blade movement resistance, be easy to make blade disintegration.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of reduction electronic vacuum pump noises for electricity
The pre- silencing means of sub- vacuum pump, and meet the electronic vacuum pump of the enhancing noise reduction of requirement of the automobile main frame maker to noise.
Technical scheme is as follows:
A kind of pre- silencing means for electronic vacuum pump, including inlet plenum, surge chamber, set between inlet plenum and surge chamber
Elastic diaphragm is set, the direct impact sound reduction cover of air-flow is avoided, realizes noise reduction；The side wall of inlet plenum offers several air passing holes.
Preferably, at least two air passing holes are distributed in the side wall of inlet plenum.
Preferably, the thickness of elastic diaphragm is less than the sidewall thickness of inlet plenum or surge chamber.
Preferably, the sidewall thickness of inlet plenum or surge chamber is not less than 5 times of the thickness of elastic diaphragm.
Preferably, the diameter of inlet plenum is greater than the diameter of elastic diaphragm, the interior walls be smooth of inlet plenum excessively to elasticity every
Film.
Preferably, inlet plenum is bowl structure, surge chamber is cylindrical structure.
A kind of electronic vacuum pump enhancing noise reduction, including the pre- silencing means, pre- silencing means is installed on silencer cover
Between pump chamber cover board, the elastic diaphragm of pre- silencing means avoids the direct impact sound reduction cover of air-flow, realizes noise reduction；Air inlet with go out
Gas circuit between port is communicated by the inlet plenum of pre- silencing means with air passing hole.
Preferably, the installing pipe of surge chamber and silencer cover is interference fitted, connected in being arranged；Pre- silencing means is in silencer cover
It is in compressive state between pump chamber cover board.
Preferably, gas outlet is provided with check valve, the valve body of the check valve is elastic horn body, vacuum pump not work
Make or stop working state under, elastic horn body covers and seals gas outlet, and under vacuum pump working condition, gas forces elastic loudspeaker
The deformation of body, forms gap between gas outlet.
Preferably, elastic horn body is connected with elastic conehead by elastomeric connector strip, valve seat, bullet are provided in gas outlet
Property conehead be installed in valve seat, elastic horn body keeps compressing the movement tendency of gas outlet.
Beneficial effects of the present invention are as follows:
Pre- silencing means of the present invention for electronic vacuum pump, by elastic diaphragm by inlet plenum, surge chamber every
It opens, the elastic diaphragm of sealing not aperture can prevent the direct impact sound reduction cover of air-flow, prevent pneumatic noise sound wave to be directed through and disappear
Sound cover is transferred to exterior space, achievees the effect that reduce noise.In the pumping of vacuum pump work, elastic diaphragm is made in gas shock
It under, is heaved towards surge chamber expansion, buffer gas flow pulsation slows down the speed that air-flow goes out pump chamber, reduces noise peak, play
Assist the effect of noise reduction.Venthole forms circumference uniform distribution along the side wall of inlet plenum, avoids turbulent air flow and generates noise.The present invention
By a variety of denoising structures, the multiple Noise Reduction of cooperative achievement, to realize better noise reduction effect.
When vacuum pump stops being evacuated, elastic diaphragm is shunk to inlet plenum, mitigation of gases back-flow velocity, reduces foreign matter resorption
Into the risk of pump chamber.Favorable current is smoothed out with the fingers in the interior walls be smooth transition of inlet plenum, reduces vortex, avoids generating eddy current crack.
The electronic vacuum pump of enhancing noise reduction of the present invention, based on the pre- silencing means, so that electronic vacuum pump
It can satisfy the noise requirements of automobile main frame maker.In the gas outlet of electronic vacuum pump, itself flexible check valve is set, from
Under movement tendency and pump inside and outside differential pressure double action that body is resiliently formed, in vacuum air pump inoperative or stopping pumping, from outside
Gas outlet is blocked, the gas outlet of vacuum pump can be blocked in gas resorption, prevents foreign matter from entering naturally or entering with resorption air
Pump chamber.When the pumping of vacuum pump work, under the pressure of air-flow elastic deformation occurs for elastic horn body, is formed between gas outlet
Gap, air-flow rush at ambient atmosphere from gap.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the pre- silencer mechanism of the prior art；
Fig. 2 is the air-flow schematic diagram of the electronic vacuum pump of the prior art；
Fig. 3 is the structural schematic diagram of pre- silencing means of the invention；
Fig. 4 is the schematic cross-sectional view of pre- silencing means of the invention；
Fig. 5 is the schematic cross-sectional view of electronic vacuum pump of the invention；
Fig. 6 is the in running order partial sectional view of electronic vacuum pump of the invention (showing air flow path)；
Fig. 7 is the partial sectional view (showing air flow path) that electronic vacuum pump of the invention is in stop working state；
Fig. 8 is the structural schematic diagram of check valve；
Fig. 9 is the schematic cross-sectional view of check valve；
Figure 10 is that vacuum pump is in running order, the partial sectional view (showing air flow path) of gas outlet and check valve；
Figure 11 is that vacuum pump is in and does not work or stop working state, the partial sectional view of gas outlet and check valve；
In figure: 10 be pre- silencing means, and 11 be inlet plenum, and 111 be air passing hole, and 12 be surge chamber, and 13 be elastic diaphragm, 20
It is air inlet, 21 be gas outlet, and 211 be valve seat, and 22 be pump chamber, and 23 be silencer cover, and 24 be pump chamber cover board, and 30 be check valve, 31
It is elastic horn body, 32 be elastomeric connector strip, and 33 be elastic conehead.
Specific embodiment
The present invention is further described in detail with reference to the accompanying drawings and embodiments.
Noise existing for the automotive electronics vacuum pump of the prior art is larger, foreign matter resorption enters pump chamber etc. in order to solve by the present invention
Deficiency provides a kind of pre- silencing means for electronic vacuum pump and a kind of electronic vacuum pump for enhancing noise reduction, by novel
The pre- silencing means of structure, promotes the noise reduction effect of electronic vacuum pump；And being elastically engaged by check valve and gas outlet, it avoids
Foreign matter enters naturally or enters with resorption air the risk of pump chamber.
As shown in Figure 3, Figure 4, a kind of pre- silencing means 10 for electronic vacuum pump, including inlet plenum 11, surge chamber 12,
Elastic diaphragm 13 is set between inlet plenum 11 and surge chamber 12, avoids the direct impact sound reduction cover 23 of air-flow, realizes noise reduction；Inlet plenum
11 side wall offers several air passing holes 111.In use, as shown in figure 5, the pre- silencing means 10 is replaced the prior art
Cylindrical rubber sleeve, be assemblied between silencer cover 23 and pump chamber cover board 24, the gas circuit between air inlet 20 and gas outlet 21
It is communicated by the inlet plenum 11 of pre- silencing means 10 with air passing hole 111.When the pumping of vacuum pump work, air-flow is taken out from air inlet 20
Enter, is discharged through pump chamber 22, inlet plenum 11, then by gas outlet 21.In the present embodiment, the pre- silencing means 10 is whole in approximation
" H " type, i.e. inlet plenum 11 and surge chamber 12 are located at 13 both ends of elastic diaphragm, that is, elastic diaphragm 13 is set to inlet plenum 11
Between surge chamber 12.In order to achieve the effect that reduce vibration noise, the pre- silencing means 10 is whole to use rubber material
It is made, for absorbing vibration.
Generate noise in order to avoid turbulent air flow, in the present embodiment, including at least two air passing holes 111, and be distributed in
The side wall of inlet plenum 11.
The thickness of elastic diaphragm 13 is less than the sidewall thickness of inlet plenum 11 or surge chamber 12, it is preferred that inlet plenum 11 is slow
5 times of thickness of the sidewall thickness of room 12 not less than elastic diaphragm 13 are rushed, to balance pre- silencing means 10 whole intensity and bullet
The deformation performance of property diaphragm 13, avoids the side wall of inlet plenum 11 or surge chamber 12 excessively thin, support strength is weaker, can not consolidate peace
Dress；Meanwhile avoiding elastic diaphragm 13 blocked up, expansion deformation can not be generated, or expansion deformation degree is lower, is unable to reach ideal
Noise reduction effect.
In order to the effect of further Promoting Layered Buffer air-flow, and favorable current is smoothed out with the fingers, reduce vortex, avoided generating being vortexed and make an uproar
Sound, the diameter of inlet plenum 11 are greater than the diameter of elastic diaphragm 13, and the interior walls be smooth of inlet plenum 11 is excessively to elastic diaphragm 13.This reality
It applies in example, inlet plenum 11 is bowl structure, and surge chamber 12 is cylindrical structure.
Based on the pre- silencing means 10, the present invention also provides a kind of electronic vacuum pumps for enhancing noise reduction, such as Fig. 5 institute
Show, including the pre- silencing means 10, pre- silencing means 10 is installed between silencer cover 23 and pump chamber cover board 24, pre- noise reduction dress
The elastic diaphragm 13 for setting 10 avoids the direct impact sound reduction cover 23 of air-flow, realizes noise reduction；Gas between air inlet 20 and gas outlet 21
Road is communicated by the inlet plenum 11 of pre- silencing means 10 with air passing hole 111.Elastic diaphragm 13, which can be avoided air-flow and directly impact, to disappear
Sound cover 23 prevents pneumatic noise sound wave to be directed through silencer cover 23 and is transferred to exterior space, promotes anti-acoustic capability.
As shown in fig. 6, elastic diaphragm 13 expands under gas shock towards surge chamber 12 when the pumping of vacuum pump work
It heaves, buffer gas flow pulsation slows down air-flow and goes out 22 speed of pump chamber, reduces noise peak.
As shown in fig. 7, elastic diaphragm 13 is shunk to inlet plenum 11 when vacuum pump stops being evacuated, mitigation of gases reflux speed
Degree reduces foreign matter resorption and enters 22 possibility of pump chamber.
In the present embodiment, the installing pipe of surge chamber 12 and silencer cover 23 is interference fitted, and is connected in being arranged；Pre- silencing means 10
It is in compressive state between silencer cover 23 and pump chamber cover board 24, so that the stable connection of surge chamber 12 and silencer cover 23, pre- noise reduction
Device 10 forms be fitted close in a longitudinal direction between silencer cover 23 and pump chamber cover board 24, reinforces the stability of installation.
Foreign matter enters naturally from gas outlet 21 in order to prevent, or enters pump chamber 22 with resorption air, and gas outlet 21 is provided with
Check valve 30, gas outlet 21 are provided with check valve 30, and as shown in Figure 8, Figure 9, the valve body of the check valve 30 is elastic loudspeaker
The inside of body 31, elastic horn body 31 forms a degree of indent.It the upper surface of elastic horn body 31 can be with gas outlet 21
It fits closely, under vacuum air pump inoperative or stop working state, as shown in figure 11, elastic horn body 31 covers and seals gas outlet
21, pump chamber 22 and ambient atmosphere are completely cut off, can prevent foreign from entering pump chamber 22.
Under vacuum pump working condition, as shown in Figure 10, gas forces elastic horn body 31 to shrink bending deformation to end, is in
Bowl structure, and then gap is formed between gas outlet 21, air-flow is communicated by gap with ambient atmosphere.Due to elastic horn body
31 inside forms indent, enables air-flow that elastic horn body 31 is more easily forced to deform.
When vacuum pump stops working, as shown in figure 11, elastic horn body 31 external pressure in own resilience and vacuum pump
Restore original shape under poor double action, fitted closely together with gas outlet 21 again, again by pump chamber 22 and ambient atmosphere
Isolation, prevents foreign matter to enter pump chamber 22 with outside air resorption.
For the installation of check valve 30, elastic horn body 31 is connected with elastic conehead 33, outlet by elastomeric connector strip 32
Valve seat 211 is provided in mouth 21, elastic conehead 33 is installed in valve seat 211, and elastic horn body 31 keeps compressing the fortune of gas outlet 21
Dynamic trend.When assembly, in sagittate elastic conehead 33 convenient for being fed through valve seat 211, and reversely it is installed on valve seat 211, it is real
It now installs and fixed convenience.
In the present embodiment, check valve 30 is whole to be made of rubber material, is sealed by the elastic deformation of rubber,
And keep compressing the movement tendency of gas outlet 21.
Above-described embodiment is intended merely to illustrate the present invention, and is not used as limitation of the invention.As long as according to this hair
Bright technical spirit is changed above-described embodiment, modification etc. will all be fallen in the scope of the claims of the invention.
Claims (10)
1. a kind of pre- silencing means for electronic vacuum pump, which is characterized in that including inlet plenum, surge chamber, inlet plenum and slow
It rushes and elastic diaphragm is set between room, avoid the direct impact sound reduction cover of air-flow, realize noise reduction；The side wall of inlet plenum offers several mistakes
Stomata.
2. the pre- silencing means according to claim 1 for electronic vacuum pump, which is characterized in that at least two air passing holes
It is distributed in the side wall of inlet plenum.
3. the pre- silencing means according to claim 1 for electronic vacuum pump, which is characterized in that the thickness of elastic diaphragm
Less than inlet plenum or the sidewall thickness of surge chamber.
4. the pre- silencing means according to claim 3 for electronic vacuum pump, which is characterized in that inlet plenum or surge chamber
Sidewall thickness not less than 5 times of thickness of elastic diaphragm.
5. the pre- silencing means according to claim 1 for electronic vacuum pump, which is characterized in that the diameter of inlet plenum is big
In the diameter of elastic diaphragm, the interior walls be smooth of inlet plenum is excessively to elastic diaphragm.
6. the pre- silencing means according to any one of claims 1 to 5 for electronic vacuum pump, which is characterized in that air inlet
Room is bowl structure, and surge chamber is cylindrical structure.
7. a kind of electronic vacuum pump for enhancing noise reduction, which is characterized in that including pre- noise reduction as claimed in any one of claims 1 to 6
Device, pre- silencing means are installed between silencer cover and pump chamber cover board, and the elastic diaphragm of pre- silencing means avoids air-flow from directly rushing
Silencer cover is hit, realizes noise reduction；Gas circuit between air inlet and gas outlet is communicated by the inlet plenum of pre- silencing means with air passing hole.
8. the electronic vacuum pump of enhancing noise reduction according to claim 7, which is characterized in that the installation of surge chamber and silencer cover
Pipe interference fit, connects in being arranged；Pre- silencing means is in compressive state between silencer cover and pump chamber cover board.
9. the electronic vacuum pump of enhancing noise reduction according to claim 7, which is characterized in that gas outlet is provided with check valve,
The valve body of the check valve is elastic horn body, and under vacuum air pump inoperative or stop working state, elastic horn body covering is simultaneously
Gas outlet is sealed, under vacuum pump working condition, gas forces elastic horn body to deform, and gap is formed between gas outlet.
10. the electronic vacuum pump of enhancing noise reduction according to claim 9, which is characterized in that elastic horn body passes through elasticity
Connection strap is connected with elastic conehead, and valve seat is provided in gas outlet, and elastic conehead is installed in valve seat, and elastic horn body keeps compressing
The movement tendency of gas outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479694.6A CN109555664A (en) | 2018-12-05 | 2018-12-05 | A kind of pre- silencing means and electronic vacuum pump for electronic vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479694.6A CN109555664A (en) | 2018-12-05 | 2018-12-05 | A kind of pre- silencing means and electronic vacuum pump for electronic vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109555664A true CN109555664A (en) | 2019-04-02 |
Family
ID=65868991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811479694.6A Pending CN109555664A (en) | 2018-12-05 | 2018-12-05 | A kind of pre- silencing means and electronic vacuum pump for electronic vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109555664A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113115198A (en) * | 2021-03-05 | 2021-07-13 | 立讯电子科技（昆山）有限公司 | Air suction carrier, air suction device and method for solving poor acoustics of earphone |
| CN114893592A (en) * | 2022-06-08 | 2022-08-12 | 厦门宏发汽车电子有限公司 | Check valve and electronic vacuum pump |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB190600346A (en) * | 1906-01-05 | 1907-01-05 | Illius Augustus Timmis | Improved Exhaust Silencing and other Terminals |
| KR20030044252A (en) * | 2001-11-29 | 2003-06-09 | 주식회사 롤텍 | Structure Able to Reduce Any Noise for a Scroll Compressor |
| CN104121160A (en) * | 2013-04-23 | 2014-10-29 | 上海旭岛汽车零部件有限公司 | Electric vacuum pump with two swinging spherical pistons |
| CN105464992A (en) * | 2016-01-19 | 2016-04-06 | 浙江万安泵业有限公司 | Vacuum pump sound insulating structure |
| KR20160082606A (en) * | 2014-12-26 | 2016-07-08 | 영신정공 주식회사 | ELECTRO VACUUM PUMP to reduce the Noise |
| CN206017102U (en) * | 2016-08-31 | 2017-03-15 | 温州品达机车部件有限公司 | The check valve assembly of electric vacuum pump of automobile |
| CN107642480A (en) * | 2017-10-24 | 2018-01-30 | 湖北鑫星冷机制造有限公司 | A kind of double-concave valve plate silencer cover plate with lift limit function |
| CN207004821U (en) * | 2017-07-05 | 2018-02-13 | 上海幸福摩托车有限公司 | A kind of noise reduction vacuum pump apparatus |
| KR20180032269A (en) * | 2016-09-22 | 2018-03-30 | (주) 솔텍 | Noise Reduction Type Canister Close Solenoid Valve |
| CN209398553U (en) * | 2018-12-05 | 2019-09-17 | 厦门宏发汽车电子有限公司 | A kind of pre- silencing means and electronic vacuum pump for electronic vacuum pump |
-
2018
- 2018-12-05 CN CN201811479694.6A patent/CN109555664A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB190600346A (en) * | 1906-01-05 | 1907-01-05 | Illius Augustus Timmis | Improved Exhaust Silencing and other Terminals |
| KR20030044252A (en) * | 2001-11-29 | 2003-06-09 | 주식회사 롤텍 | Structure Able to Reduce Any Noise for a Scroll Compressor |
| CN104121160A (en) * | 2013-04-23 | 2014-10-29 | 上海旭岛汽车零部件有限公司 | Electric vacuum pump with two swinging spherical pistons |
| KR20160082606A (en) * | 2014-12-26 | 2016-07-08 | 영신정공 주식회사 | ELECTRO VACUUM PUMP to reduce the Noise |
| CN105464992A (en) * | 2016-01-19 | 2016-04-06 | 浙江万安泵业有限公司 | Vacuum pump sound insulating structure |
| CN206017102U (en) * | 2016-08-31 | 2017-03-15 | 温州品达机车部件有限公司 | The check valve assembly of electric vacuum pump of automobile |
| KR20180032269A (en) * | 2016-09-22 | 2018-03-30 | (주) 솔텍 | Noise Reduction Type Canister Close Solenoid Valve |
| CN207004821U (en) * | 2017-07-05 | 2018-02-13 | 上海幸福摩托车有限公司 | A kind of noise reduction vacuum pump apparatus |
| CN107642480A (en) * | 2017-10-24 | 2018-01-30 | 湖北鑫星冷机制造有限公司 | A kind of double-concave valve plate silencer cover plate with lift limit function |
| CN209398553U (en) * | 2018-12-05 | 2019-09-17 | 厦门宏发汽车电子有限公司 | A kind of pre- silencing means and electronic vacuum pump for electronic vacuum pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113115198A (en) * | 2021-03-05 | 2021-07-13 | 立讯电子科技（昆山）有限公司 | Air suction carrier, air suction device and method for solving poor acoustics of earphone |
| CN114893592A (en) * | 2022-06-08 | 2022-08-12 | 厦门宏发汽车电子有限公司 | Check valve and electronic vacuum pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109555664A (en) | A kind of pre- silencing means and electronic vacuum pump for electronic vacuum pump | |
| CN209398553U (en) | A kind of pre- silencing means and electronic vacuum pump for electronic vacuum pump | |
| CN206144744U (en) | Structure of making an uproar falls in electric vacuum pump | |
| CN203430857U (en) | Novel gas compressor volute with noise elimination function | |
| CN108799122A (en) | A kind of novel electron vacuum pump applied to automobile | |
| CN209781206U (en) | Low-noise electronic vacuum pump with built-in one-way non-return structure | |
| CN209398888U (en) | It is a kind of can be by the check valve and electronic vacuum pump of stream pressure Bending Deformation | |
| CN105781681A (en) | Diaphragm type control valve for exhaust system and muffler for diaphragm type control valve | |
| CN111412143A (en) | Low-noise electronic vacuum pump with built-in one-way non-return structure | |
| CN112776783B (en) | Automobile brake vacuum pipeline | |
| CN208364245U (en) | Air inlet recycles valve seat, inlet manifold and engine | |
| CN109094549B (en) | Expansion chamber for a brake booster vacuum pump | |
| CN208348080U (en) | A kind of muffler for vacuum pump and the vacuum pump with the muffler | |
| KR20130102069A (en) | Brake actuation unit for a motor vehicle brake system and motor-pump unit for providing a vacuum for a brake actuation unit of a motor vehicle brake system | |
| CN112377667A (en) | Carbon tank electromagnetic valve and pipeline system for eliminating airflow pulsation and noise in vehicle | |
| CN205618222U (en) | Exhaust system's diaphragm formula control valve and silencer thereof | |
| CN213016974U (en) | Square composite muffler | |
| CN213039537U (en) | Square cylindrical combined silencer | |
| CN205781661U (en) | A kind of two-stage deafener of compressed air blowdown piping end | |
| CN217682454U (en) | Blower casing with expansion cavity | |
| CN211969404U (en) | Resonant cavity for electronic vacuum pump of automobile brake system and electronic vacuum pump assembly | |
| CN212203259U (en) | Anti-back suction one-way valve | |
| CN219148733U (en) | Portable silence breast pump host computer and have breast pump of this host computer | |
| CN212202637U (en) | Cylindrical composite silencer | |
| CN220551216U (en) | Exhaust port silencing structure for electronic vacuum pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |