CN112555199A - Multifunctional fan isolation box - Google Patents
Multifunctional fan isolation box Download PDFInfo
- Publication number
- CN112555199A CN112555199A CN202110097061.4A CN202110097061A CN112555199A CN 112555199 A CN112555199 A CN 112555199A CN 202110097061 A CN202110097061 A CN 202110097061A CN 112555199 A CN112555199 A CN 112555199A
- Authority
- CN
- China
- Prior art keywords
- main part
- fan
- isolation box
- muffler
- base
- 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
- 238000002955 isolation Methods 0.000 title claims abstract description 59
- 238000013016 damping Methods 0.000 claims abstract description 23
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 4
- 230000030279 gene silencing Effects 0.000 abstract description 12
- 230000003584 silencer Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a multifunctional fan isolation box, which comprises an isolation box main body and a fan main body, wherein the fan main body is arranged in the isolation box main body, the bottom end of the isolation box main body is provided with a base, the fan main body is arranged on the upper surface of the base, the isolation box body is provided with an air outlet and an air inlet which are arranged oppositely, the air outlet and the air inlet are both provided with a silencing structure, the silencing structure is provided with a connecting pipe, a fan mounting seat is arranged at the bottom end of the base, a damping structure is arranged between the fan mounting seat and the base, and the damping structure is provided with a plurality of groups, the invention arranges the fan main body in the box body formed by the isolation box main body and the base, and set up noise damping layer and the sound absorbing layer of mutual superpose at isolation box main part inner wall, during the use, utilize noise damping layer and the sound absorbing layer in the isolation box main part isolated fan main part during operation noise that produces.
Description
Technical Field
The invention relates to the technical field of fan isolation, in particular to a multifunctional fan isolation box.
Background
The fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy. Gas compression and gas delivery machines are machines that convert rotational mechanical energy into gas pressure energy and kinetic energy and deliver the gas out. The main structural components of the fan are an impeller, a shell, an air inlet, a bracket, a motor, a belt pulley, a coupling, a silencer, a transmission part (a bearing) and the like.
When the multifunctional fan is used, large noise can be generated, noise can pollute the surrounding environment, an isolation box can be arranged outside the multifunctional fan usually, the existing isolation box is simple in structure, the noise reduction effect is poor, and therefore the multifunctional fan isolation box is provided.
Disclosure of Invention
The invention aims to provide a multifunctional fan isolation box, which aims to solve the problems that when the multifunctional fan in the background art is used, the multifunctional fan generates large noise, the noise can pollute the surrounding environment, the isolation box is usually arranged outside the multifunctional fan, and the existing isolation box is simple in structure and poor in noise reduction effect.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a multi-functional fan shielded box, includes shielded box main part and fan main part, the fan main part is installed in the shielded box main part, the bottom of shielded box main part is provided with the base, the upper surface at the base is installed to the fan main part, be provided with air outlet and air intake in the shielded box main part, air outlet and air intake set up relatively, all install amortization structure on air outlet and the air intake, the last connecting pipe of installing of amortization structure, the fan mount pad is installed to the bottom of base, be provided with shock-absorbing structure between fan mount pad and the base, and shock-absorbing structure is equipped with the multiunit.
Preferably, the amortization structure is including connecting cover A, connecting cylinder, a muffler, body, No. two silencers and connecting cover B, a muffler and No. two silencers set up in the connecting cylinder, and are connected with the body between a muffler and No. two silencers, threaded connection connecting cover A and connecting cover B respectively are connected at the both ends of connecting cylinder.
Preferably, a connecting thread section of thick bamboo on connecting cover A and the connecting cover B, a muffler is close to connecting cover A, No. two silencers are close to connecting cover B, the threaded section of thick bamboo screw thread of connecting cover B is installed on isolation box main part outer wall, a threaded section of thick bamboo on the connecting cover A is connected with the connecting pipe.
Preferably, be provided with fixed frame on the base, fixed frame periphery is provided with the grafting frame, the grafting annular has been seted up to the bottom of shielded box main part, the grafting annular is arranged in to the grafting frame, the laminating of fixed frame outer wall and shielded box main part inner wall, pass through the gim peg connection between fixed frame and the shielded box main part.
Preferably, the shock-absorbing structure comprises a connecting disc, a rubber column and a shock-absorbing spring, the connecting disc is connected to the two ends of the rubber column respectively, and the shock-absorbing spring is sleeved outside the rubber column.
Preferably, the inner wall of the isolation box main body is provided with a sound-deadening layer, the outer wall of the sound-deadening layer is provided with a sound-absorbing layer, the isolation box main body is positioned at a corner and is provided with a connecting piece, and the connecting piece penetrates through the sound-deadening layer and the sound-absorbing layer.
The invention provides a multifunctional fan isolation box which has the following beneficial effects:
(1) the fan main body is arranged in the box body formed by the isolation box main body and the base, and the noise elimination layer and the sound absorption layer which are mutually overlapped are arranged on the inner wall of the isolation box main body.
(2) The silencing structure is arranged at the air outlet and the air inlet of the isolation box main body, the silencing structure is composed of the connecting cover A, the connecting cylinder, the first silencer, the connecting cylinder, the second silencer and the connecting cover B, the first silencer and the second silencer are arranged in the connecting cylinder, two groups of silencers are adopted, silencing can be better performed, noise is reduced, and all components of the silencing structure can be detachably connected, so that later-stage disassembly is facilitated.
(3) According to the invention, the plurality of groups of damping structures are arranged between the fan mounting seat at the bottom end of the fan main body and the base, and the damping structures are covered outside the rubber columns by adopting the damping springs, so that when the fan is used, the vibration generated during the work of the fan main body can be relieved by utilizing the damping structures.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the main body of the isolation box of the present invention;
FIG. 3 is a schematic structural diagram of a noise-reducing structure according to the present invention;
fig. 4 is a schematic structural view of the shock-absorbing structure of the present invention.
In the figure: 1. an isolation box body; 2. a base; 3. a fan main body; 4. an air outlet; 5. an air inlet; 6. a sound deadening structure; 7. a connecting pipe; 8. a fixing bolt; 9. a fan mounting base; 10. inserting ring grooves; 11. a plug-in frame; 12. a shock-absorbing structure; 13. a fixing frame; 14. a connecting member; 15. a sound-deadening layer; 16. a sound absorbing layer; 17. a connecting disc; 18. a rubber column; 19. a damping spring; 20. a connecting cover A; 21. a connecting cylinder; 22. a first silencer; 23. a pipe body; 24. a second muffler; 25. a connecting cover B; 26. a threaded barrel.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1 to 4, the present invention provides a technical solution: the utility model provides a multi-functional fan shielded box, is including keeping apart 1 and fan main part 3 of case main part, fan main part 3 is installed in keeping apart 1 of case main part, the bottom of keeping apart 1 of case main part is provided with base 2, fan main part 3 is installed at the upper surface of base 2, it is provided with air outlet 4 and air intake 5 to keep apart on 1 of case main part, air outlet 4 and air intake 5 set up relatively, all install amortization structure 6 on air outlet 4 and the air intake 5, install connecting pipe 7 on the amortization structure 6, fan mount pad 9 is installed to the bottom of base 2, be provided with shock-absorbing structure 12 between fan mount pad 9 and the base 2, and shock-absorbing structure 12 is equipped with the multiunit.
Further, the noise reduction structure 6 includes a connection cover a20, a connection cylinder 21, a first muffler 22, a pipe 23, a second muffler 24 and a connection cover B25, the first muffler 22 and the second muffler 24 are disposed in the connection cylinder 21, the pipe 23 is connected between the first muffler 22 and the second muffler 24, two ends of the connection cylinder 21 are respectively connected with the connection cover a20 and the connection cover B25 in a threaded manner, the connection cover a20 and the connection cover B25 are connected with the threaded cylinder 26, the first muffler 22 is close to the connection cover a20, the second muffler 24 is close to the connection cover B25, the threaded cylinder 26 of the connection cover B25 is mounted on the outer wall of the isolation box body 1 in a threaded manner, the threaded cylinder 26 of the connection cover a20 is connected with the connection cover B25, the connection cover B25 and the threaded cylinder 26 of one end of the connection cylinder 21 are mounted at the air outlet 4 and the air inlet 5, and the first muffler 22 and the second muffler 24 are disposed in the connection cylinder 21, make it have two sets of silencers, can be better carry out the amortization, the noise reduction wherein connect threaded connection between cover A20, connecting cylinder 21 and the connecting cover B25 for each subassembly of amortization structure 6 can be dismantled the connection, the later stage of being convenient for is dismantled.
Further, be provided with fixed frame 13 on the base 2, fixed frame 13 periphery is provided with grafting frame 11, grafting annular 10 has been seted up to the bottom of isolation box main part 1, grafting frame 11 is arranged in grafting annular 10, fixed frame 13 outer wall and the laminating of the 1 inner wall of isolation box main part, be connected through gim peg 8 between fixed frame 13 and the isolation box main part 1, during the installation, install the fan mount pad 9 of 3 bottoms of fan main part on base 2, then establish the 1 covers of isolation box main part in 3 outsides of fan main part, and the grafting annular 10 of the 1 bottom of isolation box main part is arranged in grafting frame 11 this moment, and fixed frame 13 laminating is at 1 inner wall of isolation box main part, then utilizes gim peg 8 to connect isolation box main part 1 and base 13 to closely and seal between isolation box main part 1 and the base 2.
Further, shock-absorbing structure 12 includes connection pad 17, rubber column 18 and damping spring 19, connection pad 17 is connected respectively at the both ends of rubber column 18, damping spring 19 cover is established in rubber column 18 outsidely, and usable damping structure 12 alleviates the vibrations that fan main part 3 during operation produced, helps reducing the noise that the vibrations produced when fan main part 3 works and organizes.
Further, keep apart 1 inner wall of case main part and be provided with noise damping layer 15, noise damping layer 15's outer wall is provided with sound absorbing layer 16, keep apart case main part 1 and be located the corner and be provided with connecting piece 14, connecting piece 14 passes noise damping layer 15 and sound absorbing layer 16 for keep apart case main part 1 and have good syllable-dividing noise reduction, utilize the noise that isolation case main part 1 can effectual reduction fan main part 3 during operation produced.
It should be noted that, in the operation of the multifunctional fan isolation box, the fixing frame 13 is arranged on the base 2, the inserting frame 11 is arranged on the periphery of the fixing frame 13, the inserting ring groove 10 is arranged at the bottom end of the isolation box main body 1, when in installation, the fan installation seat 9 at the bottom of the fan main body 3 is arranged on the base 2, then the isolation box main body 1 is covered outside the fan main body 3, at the moment, the inserting ring groove 10 at the bottom end of the isolation box main body 1 is arranged in the inserting frame 11, the fixing frame 13 is attached to the inner wall of the isolation box main body 1, then the isolation box main body 1 is connected with the fixing frame 13 by the fixing bolt 8, so that the isolation box main body 1 and the base 2 are tightly sealed, meanwhile, the silencing layer 15 and the sound absorbing layer 16 which are mutually overlapped are arranged on the inner wall of the isolation box main body 1, so that the isolation box main body 1 has good sound insulation and noise reduction effects, and the noise generated when the, meanwhile, a connecting cover A20, a connecting cylinder 21, a first silencer 22, a pipe body 23, a second silencer 24 and a silencing structure 6 consisting of a connecting cover B25 are arranged at the air outlet 4 and the air inlet 5 of the isolation box main body 1, when the silencing structure 6 is used, the connecting cover B25 at one end of the connecting cylinder 21 and the threaded cylinder 26 on the connecting cover B25 are arranged at the air outlet 4 and the air inlet 5, the connecting pipe 7 is arranged on the connecting cover A20 of the connecting cylinder 21, the first silencer 22 and the second silencer 24 are arranged in the connecting cylinder 21, the silencing structure can better perform silencing and reduce noise, wherein the connecting cover A20, the connecting cylinder 21 and the connecting cover B25 are in threaded connection, all components of the silencing structure 6 can be detachably connected and are convenient to detach at a later stage, a plurality of groups of damping structures 12 are arranged between the fan mounting seat 9 and the base 2, and the damping structures 12 consist of a connecting plate 17, a connecting plate, Rubber column 18 and damping spring 19 constitute, and when using, usable shock-absorbing structure 12 alleviates the vibrations that fan main part 3 during operation produced, helps reducing the noise that the vibrations produced when fan main part 3 works together.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a multi-functional fan shielded cell, includes shielded cell main part (1) and fan main part (3), its characterized in that: install in isolation case main part (1) fan main part (3), the bottom of isolation case main part (1) is provided with base (2), the upper surface at base (2) is installed in fan main part (3), be provided with air outlet (4) and air intake (5) on isolation case main part (1), air outlet (4) and air intake (5) set up relatively, all install amortization structure (6) on air outlet (4) and air intake (5), install connecting pipe (7) on amortization structure (6), fan mount pad (9) are installed to the bottom of base (2), be provided with shock-absorbing structure (12) between fan mount pad (9) and base (2), and shock-absorbing structure (12) are equipped with the multiunit.
2. The multifunctional fan isolation box of claim 1, wherein: amortization structure (6) are including connecting cover A (20), connecting cylinder (21), muffler (22), body (23), No. two muffler (24) and connecting cover B (25), muffler (22) and No. two muffler (24) set up in connecting cylinder (21), and are connected with body (23) between muffler (22) and No. two muffler (24), the both ends of connecting cylinder (21) are threaded connection connecting cover A (20) and connecting cover B (25) respectively.
3. The multifunctional fan isolation box of claim 2, wherein: connect a screw thread section of thick bamboo (26) on connecting cover A (20) and connecting cover B (25), muffler (22) are close to connecting cover A (20), No. two muffler (24) are close to connecting cover B (25), a screw thread section of thick bamboo (26) screw thread of connecting cover B (25) is installed on isolation box main part (1) outer wall, a screw thread section of thick bamboo (26) on connecting cover A (20) are connected with connecting pipe (7).
4. The multifunctional fan isolation box of claim 1, wherein: be provided with fixed frame (13) on base (2), fixed frame (13) periphery is provided with grafting frame (11), grafting annular (10) have been seted up to the bottom of isolation box main part (1), grafting frame (11) are arranged in grafting annular (10), fixed frame (13) outer wall and the laminating of isolation box main part (1) inner wall, be connected through gim peg (8) between fixed frame (13) and the isolation box main part (1).
5. The multifunctional fan isolation box of claim 1, wherein: shock-absorbing structure (12) include connection pad (17), rubber column (18) and damping spring (19), connection pad (17) are connected respectively at the both ends of rubber column (18), damping spring (19) cover is established in rubber column (18) outside.
6. The multifunctional fan isolation box of claim 1, wherein: keep apart case main part (1) inner wall and be provided with noise damping layer (15), the outer wall of noise damping layer (15) is provided with sound absorbing layer (16), it is provided with connecting piece (14) to keep apart case main part (1) and be located the corner, noise damping layer (15) and sound absorbing layer (16) are passed in connecting piece (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110097061.4A CN112555199A (en) | 2021-01-25 | 2021-01-25 | Multifunctional fan isolation box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110097061.4A CN112555199A (en) | 2021-01-25 | 2021-01-25 | Multifunctional fan isolation box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112555199A true CN112555199A (en) | 2021-03-26 |
Family
ID=75035768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110097061.4A Pending CN112555199A (en) | 2021-01-25 | 2021-01-25 | Multifunctional fan isolation box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112555199A (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05106893A (en) * | 1991-10-18 | 1993-04-27 | Matsushita Seiko Co Ltd | Ventilating fan |
| CN204254855U (en) * | 2014-12-01 | 2015-04-08 | 浙江新昌三瑞香雪冲业有限公司 | A kind of automotive air-conditioning system silencer for refrigerant line of automotive |
| CN204303503U (en) * | 2015-01-20 | 2015-04-29 | 国家电网公司 | There is the transformer room of decrease of noise functions |
| CN106087516A (en) * | 2016-08-25 | 2016-11-09 | 陈学红 | A kind of pulper with decrease of noise functions |
| CN206559180U (en) * | 2017-03-01 | 2017-10-13 | 理昂生态能源股份有限公司 | A kind of denoising device of biomass boiler |
| CN107861582A (en) * | 2017-12-25 | 2018-03-30 | 郑州龙威电子科技有限公司 | A kind of main frame noise reduction chassis |
| CN208565069U (en) * | 2018-06-04 | 2019-03-01 | 浙江奥帅制冷有限公司 | A kind of low noise mixed flow fan case |
| CN208763996U (en) * | 2018-08-20 | 2019-04-19 | 唐山润川环保机械有限公司 | A kind of lateral flow type blower anti-acoustic capability optimization system |
| CN209261768U (en) * | 2018-12-23 | 2019-08-16 | 无锡市华冷机械有限公司 | A kind of mine pump muffler being easily installed |
| CN210290281U (en) * | 2019-05-24 | 2020-04-10 | 广东汇发塑业科技有限公司 | Novel amortization shock attenuation fan |
| CN210282565U (en) * | 2019-07-10 | 2020-04-10 | 济南鑫顺源包装有限公司 | Mute die cutting machine |
| CN211421952U (en) * | 2019-11-11 | 2020-09-04 | 山西晋城煤业集团勘察设计院有限公司 | Noise reduction device for fan room |
| CN211474375U (en) * | 2020-01-16 | 2020-09-11 | 四川怡田科技有限公司 | Multilayer noise reduction device of air compressor |
| CN211739406U (en) * | 2020-01-11 | 2020-10-23 | 浙江尚昕能源科技有限公司 | New trend system case with shock-absorbing function of making an uproar falls |
-
2021
- 2021-01-25 CN CN202110097061.4A patent/CN112555199A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05106893A (en) * | 1991-10-18 | 1993-04-27 | Matsushita Seiko Co Ltd | Ventilating fan |
| CN204254855U (en) * | 2014-12-01 | 2015-04-08 | 浙江新昌三瑞香雪冲业有限公司 | A kind of automotive air-conditioning system silencer for refrigerant line of automotive |
| CN204303503U (en) * | 2015-01-20 | 2015-04-29 | 国家电网公司 | There is the transformer room of decrease of noise functions |
| CN106087516A (en) * | 2016-08-25 | 2016-11-09 | 陈学红 | A kind of pulper with decrease of noise functions |
| CN206559180U (en) * | 2017-03-01 | 2017-10-13 | 理昂生态能源股份有限公司 | A kind of denoising device of biomass boiler |
| CN107861582A (en) * | 2017-12-25 | 2018-03-30 | 郑州龙威电子科技有限公司 | A kind of main frame noise reduction chassis |
| CN208565069U (en) * | 2018-06-04 | 2019-03-01 | 浙江奥帅制冷有限公司 | A kind of low noise mixed flow fan case |
| CN208763996U (en) * | 2018-08-20 | 2019-04-19 | 唐山润川环保机械有限公司 | A kind of lateral flow type blower anti-acoustic capability optimization system |
| CN209261768U (en) * | 2018-12-23 | 2019-08-16 | 无锡市华冷机械有限公司 | A kind of mine pump muffler being easily installed |
| CN210290281U (en) * | 2019-05-24 | 2020-04-10 | 广东汇发塑业科技有限公司 | Novel amortization shock attenuation fan |
| CN210282565U (en) * | 2019-07-10 | 2020-04-10 | 济南鑫顺源包装有限公司 | Mute die cutting machine |
| CN211421952U (en) * | 2019-11-11 | 2020-09-04 | 山西晋城煤业集团勘察设计院有限公司 | Noise reduction device for fan room |
| CN211739406U (en) * | 2020-01-11 | 2020-10-23 | 浙江尚昕能源科技有限公司 | New trend system case with shock-absorbing function of making an uproar falls |
| CN211474375U (en) * | 2020-01-16 | 2020-09-11 | 四川怡田科技有限公司 | Multilayer noise reduction device of air compressor |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20210326 |