CN109047253A - Foul smell for sludge pressing workshop absorbs technique - Google Patents
Foul smell for sludge pressing workshop absorbs technique Download PDFInfo
- Publication number
- CN109047253A CN109047253A CN201810886153.9A CN201810886153A CN109047253A CN 109047253 A CN109047253 A CN 109047253A CN 201810886153 A CN201810886153 A CN 201810886153A CN 109047253 A CN109047253 A CN 109047253A
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- China
- Prior art keywords
- foul smell
- air
- exhaust pipe
- sludge
- suction side
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/002—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using a central suction system, e.g. for collecting exhaust gases in workshops
Abstract
The foul smell that the invention discloses a kind of for sludge pressing workshop absorbs technique, it is characterised in that: the following steps are included: isolation odor source, the step of isolation odor source is to cover sludge squeezer using cover；Siphon away foul smell, described the step of siphoning away foul smell is that the intracorporal foul smell of cover is siphoned away using exhaust pipe, wherein, exhaust pump is installed on the exhaust pipe, one end of the exhaust pipe is foul smell suction side, the other end is that foul smell excludes end, and the foul smell suction side is connected to space sealing in the cover, and the foul smell excludes end for exporting foul smell to sludge pressing workshop.Foul smell for sludge pressing workshop of the invention, which absorbs technique, has simple process, it is easy to implement in sludge pressing workshop to use, the advantages of reducing harm of the foul smell to human body, capable of effectively controlling foul smell amount in sludge pressing workshop, be suitble to should field promote the use of.
Description
Technical field
The invention belongs to sewage treatment process fields, and in particular to a kind of foul smell absorption work for sludge pressing workshop
Skill.
Background technique
Sewage treatment is in order to enable sewage reaches the water quality requirement for being discharged into a certain water body or reusing.However, in dirt
Each processing links of water process can also generate a variety of foul smell (for example, the inorganic gas such as hydrogen sulfide, ammonia and amine, mercaptan, having
The organic gas such as machine sulfide, scatol, indoles (MVOC microorganism volatile organic compounds)), these foul smell are not only perishable
It loses equipment (acid hydrogen sulfide gas), even more serious is that can pollute air, the health of harmful to human.
Currently, sewage treatment plant has had been introduced into some solutions for absorbing foul smell, for example, notification number is
The patent of CN204251466U discloses a kind of " sewage treatment plant's odor purification and aeration association system ", should " sewage treatment
Factory's odor purification and aeration association system " includes: coarse rack well, exhaust hood, inlet pumping station, pump house exhaust blower, fine fack sand setting
Pond, aerobic aeration pond, filter, air blower, exhaust fan, waste gas biofilter, active carbon adsorber, setting pot exhaust blower；
The coarse rack well, fine fack setting pot and the top of aerobic aeration tank are provided with exhaust hood；The outlet of the filter with
Blower inlet connection, blower export are connect by pipeline with the aeration head of aerobic aeration bottom of pond portion；The aerobic aeration pond
The exhaust hood on top is successively connect with exhaust fan, waste gas biofilter and active carbon adsorber by pipeline；The biology mistake
Biologic packing material is provided in filter.
But above-mentioned " sewage treatment plant's odor purification and aeration association system " there are still deficiency be:
The foul smell absorption of entire sewage treatment plant is not thorough, causes part processing workshop still to have foul smell, reason is that sewage
Treatment plant further includes having sludge pressing workshop outside except above-mentioned " coarse rack well ", " fine fack setting pot ", " aerobic aeration pond ",
Sludge pressing workshop is carried out dehydrating sludge using sludge squeezer, so that the sludge after dehydration can be by sharp again
With (agricultural or make compost).However, water-containing sludge still has foul smell, cause still exhale an offensive odor in sludge squeezer use process,
The personnel health in harm disengaging sludge pressing workshop.
Based on this, applicant consider to design it is a kind of easy to implement, can effectively absorb foul smell for sludge pressing workshop
Foul smell absorb technique.
Summary of the invention
In view of the above shortcomings of the prior art, the technical problems to be solved by the present invention are: how to provide one kind is easy to real
It applies, the foul smell for sludge pressing workshop that can effectively absorb foul smell absorbs technique.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions:
Foul smell for sludge pressing workshop absorbs technique, it is characterised in that: the following steps are included:
The step of isolation odor source, the isolation odor source is to cover sludge squeezer using cover；
Foul smell is siphoned away, described the step of siphoning away foul smell is that the intracorporal foul smell of cover is siphoned away using exhaust pipe, wherein the exhaust pipe
On exhaust pump is installed, one end of the exhaust pipe is foul smell suction side, and the other end is that foul smell excludes end, the foul smell suction side
It is connected to space sealing in the cover, the foul smell excludes end for exporting foul smell to sludge pressing workshop.
When implementation, the foul smell excludes end and is connected to conveyance conduit (not shown), and foul smell is delivered to by conveyance conduit
At odor purification processing, the construction at the odor purification processing is the prior art, and for details, reference can be made to notification numbers in the prior art to be
The patent of CN204251466U is " the exhaust gas biology disclosed in a kind of " sewage treatment plant's odor purification and aeration association system "
Filter " and " active carbon adsorber ", therefore not to repeat here.
Compared with the existing technology compared with the advantages of foul smell for sludge pressing workshop of the invention absorbs technique is:
1, by the odor source (sludge squeezer) in sludge pressing workshop, individually isolation is got up, and prevents sludge squeezer treatment process
In excessive to the entire sludge pressing workshop of foul smell, reduce harm of the foul smell to human body.
2, foul smell is siphoned away, the foul smell amount that isolation is got up in space is reduced, is played and is absorbed foul smell and effectively control sludge pressing
The effect of the foul smell amount in workshop.
3, simple process is easy to implement in sludge pressing workshop to use.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the present invention absorbs the cover that technique uses for the foul smell in sludge pressing workshop.
Fig. 2 is the application schematic diagram of cover in Fig. 1 (air-supply gap is wider).
Fig. 3 is the application schematic diagram of cover in Fig. 1 (air-supply is relatively narrow with gap).
Fig. 4 is the vertical of the eddy flow generating piece in the cover that the present invention is used for the foul smell absorption technique in sludge pressing workshop
Body structural schematic diagram.
Fig. 5 is the top view of eddy flow generating piece in Fig. 4.
Fig. 6 is I-I cross-sectional view in Fig. 5.
In the figure, it is marked as
1 sludge squeezer；
2 exhaust pipes: 21 foul smell suction sides, 22 foul smell exclude end, 23 hose connectors, 24 sleeve for connection；
3 exhaust pumps；
4 air supply tubes: 41 air suction sides, 42 air send out end；
5 blast pumps；
Gap is used in 6 air-supplies；
7 connecting rods；
8 lifting cucurbits；
9 eddy flow generating pieces: 91 ventilation holes, 92 O-ring seals.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing.
Foul smell for sludge pressing workshop absorbs technique, comprising the following steps:
The step of isolation odor source, the isolation odor source is that sludge squeezer 1 is covered using cover；
Foul smell is siphoned away, described the step of siphoning away foul smell is that the intracorporal foul smell of cover is siphoned away using exhaust pipe 2, wherein the exhaust
Exhaust pump 3 is installed, one end of the exhaust pipe 2 is foul smell suction side 21, and the other end is that foul smell excludes end 22, described on pipe 2
Foul smell suction side 21 is connected to space sealing in the cover, and the foul smell excludes end 22 for exporting foul smell to sludge pressing
Outside workshop.
When implementation, the foul smell excludes end 22 and is connected to conveyance conduit (not shown), and conveyance conduit conveys foul smell
To odor purification processing, the construction at the odor purification processing is the prior art, and for details, reference can be made to notification numbers in the prior art
Patent for CN204251466U is " the exhaust gas life disclosed in a kind of " sewage treatment plant's odor purification and aeration association system "
Object filter " and " active carbon adsorber ", therefore not to repeat here.
Wherein, as shown in Figures 1 to 6, the cover includes air supply tube 4, blast pump 5, exhaust pipe 2 and exhaust pump 3；
One end of the air supply tube 4 is the air suction side 41 that inside is equipped with the blast pump 5, and the other end is that air sends out end
42, the air suction side 41 and the atmosphere outside sludge pressing workshop, the air send out end 42 and are located at sludge pressing vehicle
In and it is outstanding be fixed at the top of the sludge squeezer 1, it is in inverted funnel-form that it is whole, which to send out end 42, for the air；
The lower end of the exhaust pipe 2 is foul smell suction side 21, and it is in inverted funnel-form that the foul smell suction side 21 is whole, and air draft
The air that the foul smell suction side 21 of pipe is integrally located at air supply tube 4 sends out the inside at end 42, the foul smell suction side 21 of exhaust pipe 2 it is outer
It is spaced apart and is formed air-supply gap 6 between the medial surface at the air of side and air supply tube 4 submitting end 42, through air-supply seam
The air that gap 6 projects can surround the air curtain for surrounding sludge squeezer 1；
The upper section sealing of the exhaust pipe 2 runs through the tube wall of 4 upper section of air supply tube, and the upper section of the exhaust pipe 2 is equipped with
The exhaust pump 3, the upper end of the exhaust pipe 2 are that foul smell excludes end 22.
Above-mentioned cover has the advantage, that
1, it is effectively isolated foul smell, and convenient for dimension inspection personnel viewing and maintenance sludge squeezer 1；Specifically:
" lateral surface of the foul smell suction side 21 of exhaust pipe 2 and the air of air supply tube 4 send out the interior of end 42 for the utilization of this programme original creation
It is spaced apart between side and forms air-supply and enabled with gap 6 " and " surround packet with the air that gap 6 is projected through the air-supply
Surround the air curtain of sludge squeezer 1 ", the foul smell generated in use by sludge squeezer 1 is isolated using air curtain,
Not only have the advantages that isolation effect is good, is also convenient for dimension inspection personnel and watches sludge squeezer 1 outside air curtain isolated area, with
And pass in and out air curtain easily to overhaul sludge squeezer 1.
At the same time, because above-mentioned " air curtain " is while playing buffer action, also as " air suction side 41 and dirt
Atmosphere outside mud milling shop ", so, additionally it is possible to it is largely conveyed by " air curtain " into sludge pressing workshop fresh
While optimizing air quality in sludge pressing workshop the foul smell content in sludge pressing workshop is greatly reduced, significantly in air
Reduce harm of the foul smell to sludge pressing workshop human health is in.
2, foul smell is absorbed abundant.Specifically: because having, " lower end of exhaust pipe 2 is foul smell suction side 21, and the foul smell is inhaled
It is in inverted funnel-form that it is whole, which to enter end 21, " structure；So inverted funnel-form convenient for foul smell converge with this and can be vented
Drain foul smell rapidly after 3 starting of pump.
And after the starting of exhaust pump 3, the foul smell suction side 21 of exhaust pipe 2 and space below will form " negative pressure ", should
" negative pressure " can also act on " air curtain " simultaneously and the space that " air curtain " is isolated can be slightly reduced and form " extruding isolation
Space " effect (" extruding insulating space " effect disappears after exhaust pump 3 is shut down), to help more sufficient absorption foul smell.
3, compact-sized, occupied space is smaller, and cost is relatively low.Specifically: exhaust pipe 2 is embedded inside air supply tube 4, thus
4 inner space of air supply tube is made full use of, space utilization rate is higher, so that cover overall structure is more compact, occupies
Space is smaller.Meanwhile being that plane " air curtain " is generated using air curtain in the prior art, if being generated using air curtain
If " air curtain " of cover type, not only structure is extremely complex, and can also be realized using several air curtains simultaneously, cost pole
Its is high, and for by the prior art, the structure of cover is more simple in this programme, and cost is more cheap, has more preferable
Exploitativeness.
Wherein, the air of the lateral surface and air supply tube 4 that are in the foul smell suction side 21 of exhaust pipe 2 sends out the medial surface at end 42
Between the air-supply at any one place be equal with the width in gap 6.
Above-mentioned technical characteristic defines that " lateral surface of the foul smell suction side 21 of exhaust pipe 2 and the air of air supply tube 4 send out end
42 medial surface " is shiny surface, and air-supply uses the even width in gap 6 consistent everywhere, so, can effectively protect
Demonstrate,prove the smoothness of air-supply, it is ensured that cover can generate reliable " air curtain ".
When implementation, the width (" d " in such as Fig. 2) in air-supply gap 6 is 0.5 centimetre to 5 centimetres.It so can be preferable
Ensure the blow strength (barrier intensity) of " air curtain ", it is ensured that sealing performance.
Wherein, it is connected between the upper section and lower section of the exhaust pipe 2 using the sealing of hose connector 23；On the exhaust pipe 2
Pipeline section between 23 lower section of the hose connector and 4 outside of the air supply tube integrally can vertical lifting be fixedly mounted on liter
On descending mechanism.
When implementation, the hose connector 23 is bellows.
When implementation, section is plugged at the perforation of 2 through part of discharge hoses on air supply tube 4 and is rotated by 90 ° shape V in counterclockwise
The O-ring seal 92 of type, exhaust pipe 2 run through air supply tube 4 through the O-ring seal 92 sealing.
After adopting the above scheme, that is, the lower end of exhaust pipe 2 is enabled to move up and down under the action of elevating mechanism, this
The benefit of sample is:
Because lifting exhaust pipe 2 can adjust the width in air-supply gap 6, and because the air output of blast pump 5 is constant, therefore energy
When enough width in air-supply gap 6 become smaller, so that the intensity for blowing out wind-force with gap 6 through air-supply is higher, it can blow obliquely
To farther ground, bigger isolation range (sludge squeezer 1 bigger with land occupation is suitble to match) is obtained；Conversely, sending
When the width in wind gap 6 becomes larger, the intensity for blowing out wind-force with gap 6 through air-supply is lower, and the distance for blowing to ground obliquely becomes
Small (being suitble to match with the smaller sludge squeezer 1 of land occupation), isolation range also becomes smaller, but the thickness of air curtain increases, and can obtain
Obtain more preferably foul smell isolation effect.
As it can be seen that above scheme can be matched preferably with the sludge squeezer 1 of a variety of occupied areas to use, cover is promoted
The flexibility and practicability that body uses.
Wherein, the elevating mechanism includes connecting rod 7 and lifting cucurbit 8；
The connecting rod 7, which is fixed on the exhaust pipe 2, to be located between 23 lower section of hose connector and 4 outside of the air supply tube
Pipeline section on, in the connecting rod 7 have hanging ring；
The lifting cucurbit 8 is fixed by the bracket at the top position for being mounted on the hose connector 23, the lifting cucurbit 8
Suspension hook hooks the hanging ring.
When implementation, lifting cucurbit 8 can be electric up-down cucurbit 8 or bottle gouard moved by hands.
When implementation, lifting cucurbit 8 can be fixed by the bracket on the metope or ceiling for being mounted on sludge pressing workshop.
Going up and down cucurbit 8 is a kind of existing common suspender, gone up and down using lifting cucurbit 8 exhaust pipe 2 have it is easy to operate,
It is easy to the advantages of arranging installation at the scene.
Wherein, the cover further includes eddy flow generating piece 9, and the eddy flow generating piece 9 is generally annular in shape, the eddy flow
Generating piece 9 is sleeved and fixed outside the pipeline section being located above 4 inside of air supply tube and foul smell suction side 21 on the exhaust pipe 2
Portion；
The oblique ventilation hole 91 being provided through between the upper and lower end face of the eddy flow generating piece 9, the ventilation hole 91 it is oblique
Through direction and being sleeved on the exhaust pipe 2 is staggered between the axial line of pipeline section, and the ventilation hole 91 is to be abound with to be set to
The upper and lower end face of the eddy flow generating piece 9 and in a circumferential direction uniform intervals are arranged multiple；
9 medial surface of eddy flow generating piece and lateral surface are provided with seal groove, and O-ring seal 92 is arranged in the seal groove.
The setting of eddy flow generating piece 9 can not only have been kept air supply tube 4 by eddy flow generating piece 9 and be located at air supply tube 4
Internal exhaust pipe 2 it is concentric, and then preferably ensure " lateral surface of the foul smell suction side 21 of exhaust pipe 2 and air supply tube 4
The air-supply at any one place that air is sent out between the medial surface at end 42 is equal with the width in gap 6 " feature so that by blowing
" air curtain " consistency of thickness everywhere generated with the air-supply of gap 6, guarantees the isolating seal and quality of air curtain.
At the same time, the setting of eddy flow generating piece 9, additionally it is possible to so that air-supply with gap 6 send out " air curtain " slightly around
Exhaust pipe 2 axial line rotation, " air curtain " of rotation can generate vortex effect and make sludge squeezer 1 issue it is smelly
Gas is concentrated and is improved smelly close to the axis line location of exhaust pipe 2 so as to rapidly absorb foul smell after the unlatching of exhaust pump 3
The efficiency that aspiration removes.
In addition, when implementing, preferably 21 top edge of foul smell suction side of exhaust pipe 2 is along itself axially extending being formed with connection
With sleeve 24, the medial surface of the sleeve for connection 24 has screw thread, corresponding, and 4 inside of air supply tube and position are on exhaust pipe 2
Pipeline section above foul smell suction side 21 is vertical round tube shape structure, and the lower end outside face band of the vertical round tube shape structure
There is connection screw thread, the lower end of the vertical round tube shape structure is connected with the sleeve for connection 24 by screw thread.In this way, connection
It can be used in abutting with the upper end of sleeve 24 and eddy flow generating piece 9 limited, further, in the lower end surface of eddy flow generating piece 9
Recess is provided with limiting slot at medial surface, corresponding, and in the upper surface of sleeve for connection 24, fixed setting is limited for grafting
Protrusion in the slot of position, the structure matched using protrusion with limiting slot is more simple, and can make eddy flow in 5 wind-force of blast pump
Generating piece 9 rotates rear projection and is voluntarily aligned with limiting slot and completes to assemble.Further, preferably limiting slot and protrusion is in circumference side
It is arranged to uniform intervals multiple.
When implementation, preferably air supply tube 4 is generally fixed by the bracket the ground for being mounted on sludge pressing workshop or metope (is adopted
Connecting flange can be used when being fixedly mounted used in metope and metope is fixedly linked).
The above is only the preferred embodiment of the present invention, it is noted that not departing from this for those skilled in the art
Under the premise of technical solution, the technical solution for the several modifications and improvements made should equally be contemplated as falling within the claims requirement
The range of protection.
Claims (6)
1. the foul smell for sludge pressing workshop absorbs technique, it is characterised in that: the following steps are included:
The step of isolation odor source, the isolation odor source is to cover sludge squeezer using cover；
Foul smell is siphoned away, described the step of siphoning away foul smell is that the intracorporal foul smell of cover is siphoned away using exhaust pipe, wherein the exhaust pipe
On exhaust pump is installed, one end of the exhaust pipe is foul smell suction side, and the other end is that foul smell excludes end, the foul smell suction side
It is connected to space sealing in the cover, the foul smell excludes end for exporting foul smell to sludge pressing workshop.
2. the foul smell according to claim 1 for sludge pressing workshop absorbs technique, it is characterised in that: the cover packet
Include air supply tube, blast pump, exhaust pipe and exhaust pump；
One end of the air supply tube is the air suction side that inside is equipped with the blast pump, and the other end is that air sends out end, institute
The atmosphere outside air suction side and sludge pressing workshop is stated, the air sends out end and is located in sludge pressing workshop and hangs solid
At the top of the sludge squeezer, it is integrally in inverted funnel-form that the air, which sends out end,；
The lower end of the exhaust pipe is foul smell suction side, and the foul smell suction side is integrally in inverted funnel-form, and air-exhausting duct
The air that foul smell suction side is integrally located at air supply tube sends out the inside at end, the lateral surface and air supply tube of the foul smell suction side of exhaust pipe
Air send out and be spaced apart between the medial surface at end and form air-supply gap, the air projected through the air-supply gap can
Surround the air curtain for surrounding sludge squeezer；
The upper section sealing of the exhaust pipe runs through the tube wall of the air supply tube upper section, and the upper section of the exhaust pipe be equipped with it is described
Exhaust pump, the upper end of the exhaust pipe are that foul smell excludes end.
3. the foul smell according to claim 2 for sludge pressing workshop absorbs technique, it is characterised in that: be in exhaust pipe
The lateral surface of foul smell suction side and the air of air supply tube send out the air-supply at any one place between the medial surface at end with gap
Width is equal.
4. the foul smell according to claim 2 for sludge pressing workshop absorbs technique, it is characterised in that: the exhaust pipe
Upper section and lower section between using hose connector sealing be connected to；It is located at below the hose connector on the exhaust pipe and is sent with described
Pipeline section between air hose outside integrally can vertical lifting be fixedly mounted on elevating mechanism.
5. the foul smell according to claim 4 for sludge pressing workshop absorbs technique, it is characterised in that: the elevator
Structure includes connecting rod and lifting cucurbit；
The connecting rod is fixed on the pipe being located at below the hose connector between the air supply tube outside on the exhaust pipe
Duan Shang has hanging ring in the connecting rod；
The lifting cucurbit is fixed by the bracket at the top position for being mounted on the hose connector, the suspension hook of the lifting cucurbit
Hook the hanging ring.
6. the foul smell according to claim 2 for sludge pressing workshop absorbs technique, it is characterised in that: the cover is also
Including eddy flow generating piece, the eddy flow generating piece is generally annular in shape, and the eddy flow generating piece is sleeved and fixed in the exhaust
It is located at the pipe section exterior inside the air supply tube and above foul smell suction side on pipe；
The oblique ventilation hole being provided through between the upper and lower end face of the eddy flow generating piece, the oblique of the ventilation hole run through side
It is staggered to being sleeved on the exhaust pipe between the axial line of pipeline section, and the ventilation hole is to be abound with to be set to the eddy flow life
The upper and lower end face of member and in a circumferential direction uniform intervals are arranged multiple；
The eddy flow generating piece medial surface and lateral surface are provided with seal groove, are arranged with O-ring seal in the seal groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810886153.9A CN109047253B (en) | 2018-08-06 | 2018-08-06 | Odor suction and removal process for sludge pressing workshop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810886153.9A CN109047253B (en) | 2018-08-06 | 2018-08-06 | Odor suction and removal process for sludge pressing workshop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109047253A true CN109047253A (en) | 2018-12-21 |
| CN109047253B CN109047253B (en) | 2021-06-15 |
Family
ID=64832133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810886153.9A Expired - Fee Related CN109047253B (en) | 2018-08-06 | 2018-08-06 | Odor suction and removal process for sludge pressing workshop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109047253B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109530380A (en) * | 2018-12-28 | 2019-03-29 | 哈尔滨新海德智能环境工程有限公司 | Air-flow seal bootr mouth |
| CN109821851A (en) * | 2019-03-28 | 2019-05-31 | 徐州博源科技有限公司 | A kind of dispatch one composite ventilating duct and dust gathering arrester |
| US20220000597A1 (en) * | 2020-07-01 | 2022-01-06 | Bert Milford SIMPSON, JR. | Extra-oral aerosol capture hood |
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| CN2071976U (en) * | 1990-04-05 | 1991-02-27 | 丁守宝 | Gas curtain type gas purifier |
| KR20020074300A (en) * | 2001-03-20 | 2002-09-30 | 연규문 | Rangehood Aircurtain |
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| CN109530380A (en) * | 2018-12-28 | 2019-03-29 | 哈尔滨新海德智能环境工程有限公司 | Air-flow seal bootr mouth |
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| US20220000597A1 (en) * | 2020-07-01 | 2022-01-06 | Bert Milford SIMPSON, JR. | Extra-oral aerosol capture hood |
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| Publication number | Publication date |
|---|---|
| CN109047253B (en) | 2021-06-15 |
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