CN109157938A - A kind of application method for the device being dusted using Venturi effect - Google Patents
A kind of application method for the device being dusted using Venturi effect Download PDFInfo
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- CN109157938A CN109157938A CN201811226183.3A CN201811226183A CN109157938A CN 109157938 A CN109157938 A CN 109157938A CN 201811226183 A CN201811226183 A CN 201811226183A CN 109157938 A CN109157938 A CN 109157938A
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- air
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- air duct
- exhaust pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/10—Combinations of devices covered by groups B01D45/00, B01D46/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The present invention relates to a kind of application methods of device being dusted using Venturi effect.Its main feature is that dust-extraction unit is made of air inlet hole, stone roller sand workshop, leakage dirt floor, underground air duct, exhaust pipe, arc water tank, venturi air drain, anti-circular arc wind eaves, underground water mist spraying head, dust suction wet cloth are sequentially arranged in underground air duct, application method: when air-flow flows through arc water tank, flow velocity is fast, pressure is low, the air flow direction top of exhaust pipe lower part；On the other hand, the salt deposit in exhaust pipe absorbs sunlight, and the air being heated is upward；In this way, above-mentioned two strands of uprush flow to the external world from exhaust outlet, and extraneous air-flow is made to enter air inlet hole, when the air-flow passes through the venturi air drain of underground air duct, flow velocity increases, and pressure becomes smaller, and then when passing through anti-circular arc wind eaves, flow velocity further increases, pressure more becomes smaller, so that the air containing dust ground in sand workshop is attracted, flows to from exhaust outlet extraneous.Cleaner of the invention does not need consumption electric power and noiseless.
Description
Technical field
The present invention relates to a kind of cleaners, more particularly to the cleaner in a kind of production of dry sand-grinding.
Background technique
Patent CN102000625A(Special-purpose dust extraction unit for dry method sand milling dust extraction complete equipment and dust removal method) provide one
Kind mist dust suppression dust excluding hood and vibrating screen discharge gate are equipped with the technical solution of back taper dust hood, by caused by water mist spraying head
Water mist cover covers overwhelming majority dust caused by circular cone sand making machine, vibrating mechanism, the dust missed by dust hood and
Negative pressure sucking air pipe sucks deduster dedusting.Although realizing mist dust suppression, primary dedusting, final dusting, energy consumption consumption is reduced
And noise, but its shortcoming is that the deduster still has power consumption and noise.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, utilize natural airflow by dry method the purpose of the present invention is to provide a kind of
It grinds generated dust is dusted in sand production dust-extraction unit and application method, the device and does not need traditional deduster,
There is no need to consume the energy, and do not generate noise.
The present invention is implemented as follows: the device includes equipped with the stone roller sand workshop for grinding sand equipment, it further include air inlet hole, dust suction system
System, exhaust pipe, arc water tank；Dust collecting system is made of stone roller sand workshop, leakage dirt floor, underground air duct, in underground air duct in order
Venturi air drain, anti-circular arc wind eaves, underground water mist spraying head, the first dust suction wet cloth are set；Wherein, it grinds sand workshop top and is equipped with air inlet
Cavity, lower part connection leakage dirt floor；Downward, edge is connect with leakage dirt floor on anti-circular arc wind eaves convex surface；The leakage dirt floor is set
There is the hole of multiple leakage dirt, the anti-circular arc wind eaves is equipped with the gap of a plurality of leakage dirt；Air inlet hole one end is located at ground, the other end and ground
The venturi air drain of lower air duct one end connects；The underground air duct other end is connect with exhaust pipe lower part, and junction setting can be clung
First dust suction wet cloth of dust；Upward, bottom plane is equipped with the second dust suction wet cloth that can cling dust on arc water tank convex surface；Arc
Shape water tank is connect with exhaust pipe top, and the junction of the two is equipped with exhaust outlet；Muti-piece dust-catching board, dust-catching board are additionally provided in exhaust pipe
Outer covering third dust suction wet cloth；
Exhaust pipe is transparent material, the part toward the north of exhaust pipe, the semicircular cylinder equipped with transparent material production, and semicircular cylinder is located at the
On one dust suction wet cloth, salt deposit is equipped between semicircular cylinder and exhaust pipe；The surface of salt is set as black in salt deposit.
Underground water mist spraying head is made of water pipe and the multiple Small Holes being arranged on water pipe, under the hydraulic pressure of tap water, water
From multiple Small Holes high speed ejection water columns, water column impinges upon the top of underground air duct, is cleaved into water particle, the water being dispersed into air
Particle forms water mist；One or more underground water mist spraying head is set along the axis of underground air duct；
The anti-circular arc wind eaves protrudes from venturi air drain top.
In underground, cross section is rectangle for the underground air duct setting.
The sand workshop of grinding is communicated by the hole on leakage dirt floor and the gap of anti-circular arc wind eaves with underground air duct.
Arc water tank bottom surface is equipped with multiple micro holes, and the water oozed out from micro hole is absorbed by the second dust suction wet cloth.
The water of the arc water tank penetrates into the positioned at exhaust pipe lower part and underground air duct junction by connecting pipe
In third wet cloth outside one dust suction wet cloth and dust-catching board.
Sewer is set in the underground air duct, and sewer is connected with spillway, and spillway leads to the external world；It is heavy to be arranged in spillway
Buoyancy gate is arranged in open caisson for well.
The buoyancy gate is a rectangular housing.
The application method of the device: on the one hand, when flowing through the convex surface of arc water tank due to external air flow, flow velocity is accelerated, row
Pressure near port reduces, and uprush is formed at the high air flow direction top of exhaust pipe lower part pressure, flows to from exhaust outlet
It is extraneous；On the other hand, the salt deposit of the black in exhaust pipe absorbs the heat of sunlight, and heat storage in salt deposit and is heated
Air in exhaust pipe, the air being heated is upward, forms uprush, also flows to from exhaust outlet extraneous；In this way, above-mentioned two
Stock uprush makes extraneous air-flow enter air inlet hole, and when which passes through the venturi air drain of underground air duct, flow velocity adds
Greatly, pressure becomes smaller, and when then passing through anti-circular arc wind eaves, flow velocity is further increased, and pressure more becomes smaller, so that grinding in sand workshop
Air containing dust is attracted, across the hole on leakage dirt floor and the gap of anti-circular arc wind eaves, into underground air duct, and then companion
The air-flow flowed into underground air duct is formed together mixed airflow and flows towards exhaust pipe direction, the dust in the mixed airflow first by
The water mist that underground water mist spraying head sprays covers, while falling it downward, the micro dust not covered by water mist, in company with mixing
The third dust suction that air-flow hits the first dust suction wet cloth of the junction of exhaust pipe lower part and underground air duct and is covered on outside dust-catching board
Wet cloth, the first wetted dust suction wet cloth and third dust suction wet cloth are clung；Hereafter, which rises in exhaust pipe, and
The the second dust suction wet cloth for colliding arc water tank bottom surface afterwards, when dust remaining in the mixed airflow is clung by the second dust suction wet cloth
Afterwards, the air for becoming clean is flowed out from exhaust outlet.
Contribution of the invention is: the cleaner for changing the prior art needs to consume electric power, and cleaner exists
The operating mode of noise pollution.The present invention uses physical principle, so that natural airflow driving dust is enclosed moisture content and carries out gravitational dust collection
With wet cloth dedusting, finally the pure air after dedusting is discharged into outside air.
Detailed description of the invention
Below with reference to figure, the present invention is further described.
Fig. 1 is the structural schematic diagram of dust-extraction unit of the invention.
Fig. 2 is the portion A enlarged partial isometric view in Fig. 1.
Fig. 3 is B-B sectional view in Fig. 1.
Fig. 4 is C-C sectional view in Fig. 1.
Specific embodiment
Present invention is generally directed to patent CN102000625A(Special-purpose dust extraction unit for dry method sand milling dust extraction complete equipment and dedustings
Method) dust-extraction unit and dust removal method made improvement.The present embodiment can be in the water mist spraying head for retaining the prior art
Generated water mist cover is dusted in the case where removing remaining dedusting setting in the art solutions；It has been also possible to
It is dusted in the case where the complete all dedustings setting removed in the prior art scheme.
Embodiment 1, the inventive system comprises the stone roller sand workshops 21 for being equipped with stone roller sand equipment, further include air inlet hole 1, dust suction system
System 2, exhaust pipe 3, arc water tank 27；Dust collecting system is made of stone roller sand workshop 21, leakage dirt floor 22, underground air duct 24, ground leeward
Venturi air drain 33, anti-circular arc wind eaves 23, underground water mist spraying head 25, the first dust suction wet cloth 26 are sequentially arranged in road；Wherein, it grinds
Stone roller sand equipment 29(circular cone sand making machine, the vibrating mechanism of the prior art are installed on the leakage dirt floor 22 in sand workshop 21), grind sand workshop
Top is equipped with the cavity 211 of air inlet.Anti- circular arc wind eaves 23 protrudes from 33 top of venturi air drain.Anti- 23 convex surface court of circular arc wind eaves
Under, edge is connect with leakage dirt floor 22；The anti-circular arc wind eaves 23 be equipped with a plurality of gap 231(see Fig. 2), effect be containing
The air of dust can be flowed out from gap 231.Hole 221 in the leakage dirt floor 22 is also to be used to flow out the sky containing dust
Gas.Sand workshop 21 is ground to communicate by the hole 221 on leakage dirt floor and the gap 231 of anti-circular arc wind eaves with underground air duct 24.Describedly
The setting of lower air duct 24 is rectangle in underground, cross section, is also possible to circle.Air inlet 1 one end of hole is located at ground, the other end and ground
The venturi air drain 33 of lower air duct one end connects；24 other end of underground air duct is connect with 3 lower part of exhaust pipe, junction setting the
One dust suction wet cloth 26；A part of air duct 24 located underground of first dust suction wet cloth, 26 length, another part are attached to the interior of exhaust pipe 3
On wall.Upward, bottom plane is equipped with the second dust suction wet cloth 28 on arc water tank 27 convex surface；27 bottom of arc water tank is equipped with multiple micro-
Aperture, the water oozed out from micro hole are absorbed by the second dust suction wet cloth 28；Arc water tank 27 is connect with 3 top of exhaust pipe, the two
Junction is equipped with exhaust outlet 31 and connecting pipe 34；It is additionally provided with muti-piece dust-catching board 35 in exhaust pipe, covers third outside dust-catching board 35
Dust suction wet cloth；The water of arc water tank 27 penetrates into the positioned at exhaust pipe lower part and underground air duct junction by connecting pipe 34
In third wet cloth outside one dust suction wet cloth 26 and dust-catching board 35；The first dust suction wet cloth 26, the second dust suction wet cloth 28 containing moisture content
It is used to cling the dust in air-flow with third dust suction wet cloth.
The exhaust pipe 3 is transparent material, the part toward the north of exhaust pipe 3, the semicircular cylinder 5 equipped with transparent material production
(see figure 3), semicircular cylinder 5 are located on the first dust suction wet cloth 26, and salt deposit 6 is equipped between semicircular cylinder and exhaust pipe；Salt in salt deposit
Surface is set as black；
The water source and hydraulic pressure of the underground water mist spraying head 25 and arc water tank 27 are the water source and hydraulic pressure of commercially available tap water.
The underground water mist spraying head 25 can be commercially available water mist spraying head.But it since underground air duct 24 is rectangle, preferably adopts
Water mist (see figure 4) is formed with the following methods: multiple Small Holes are set on water pipe 252 as water mist spraying head, in the water of tap water
Pressure, for water from multiple Small Holes high speed ejection water columns 254, water column 254 impinges upon the top of underground air duct 24, is cleaved into water particle,
The water particle being dispersed into air forms water mist 251.Benefit using such water mist spraying head is: along 24 axis of underground air duct
More than one settable underground water mist spraying head 25.When mixed airflow is after multiple tracks water mist, exhausted most in mixed airflow or
Whole dust can fall in 24 lower part of underground air duct.Water mist cover caused by the water mist spraying head of the technical characteristic prior art, also
The water pipe for being provided with multiple Small Holes replaces water mist spraying head, and one piece is added above the Small Holes and is made from multiple Small Holes
The water of high speed ejection hits the hard plate (not shown) at water particle.
Sewer 253 can be set in underground air duct 24 and spillway 92(is shown in Fig. 1 and Fig. 4), the water that water mist spraying head 25 sprays
Sewer 253 is flowed into, then flows to the external world from spillway 92.
To prevent extraneous air from entering from spillway 92, the air flow direction in underground air duct 24 and exhaust pipe 3 is interfered, it can be with
Open caisson 91 is set in spillway 92, and buoyancy gate 93(is set in open caisson 91 and sees Fig. 1).Buoyancy gate 93 is a Rectangular shell
Body can float in water.When the water in sewer 253 flows into open caisson 91, buoyancy gate 93 floats in water, and extra water
It is overflowed from open caisson 91, and then flows to the external world from spillway 92.Extraneous air-flow is then blocked in except buoyancy gate 93.
The application method of the device: when flowing through the convex surface of arc water tank 27 due to external air flow, flow velocity is accelerated, exhaust outlet 31
Neighbouring pressure reduces, the high air flow direction top of 3 lower part pressure of exhaust pipe, forms uprush, flows to from exhaust outlet 31
It is extraneous；On the other hand, the salt deposit 6 of the black in exhaust pipe 3 absorbs the heat of sunlight, and heat storage in salt deposit and is added
Air in heat exhaust tube 3, the air being heated is upward, forms uprush, and also flowing to the external world from exhaust outlet 31, (salt has
Thermal properties are stored, at night, the heat of salt release storage heats the air in exhaust pipe)；In this way, above-mentioned two strands strong rise
Air-flow makes extraneous air-flow enter air inlet hole 1, and when which passes through the venturi air drain 33 of underground air duct, flow velocity is increased, pressure
Become smaller, when then passing through anti-circular arc wind eaves 23, flow velocity is further increased, and pressure more becomes smaller, so that grinding containing in sand workshop 21
There is the air of dust to be attracted, across the hole 221 on leakage dirt floor and the gap 231 of anti-circular arc wind eaves, is into underground air duct 24(
The air that supplement is lost, extraneous air enter from the cavity 211 for grinding sand workshop 21), and then in company with flowing into underground air duct 24
In air-flow be formed together mixed airflow and flowed towards 3 direction of exhaust pipe, the dust in the mixed airflow is sprayed by underground water mist first
First 25 water mists 251 sprayed cover, while falling it downward, the micro dust not covered by water mist, in company with mixed airflow
The third for hitting the first dust suction wet cloth 26 of the junction of 3 lower part of exhaust pipe and underground air duct 24 and being covered on outside dust-catching board 35 is inhaled
Dirt wet cloth, the first wetted dust suction wet cloth 26 and third dust suction wet cloth are clung；Hereafter, the mixed airflow in exhaust pipe 3 on
It rises, the second dust suction wet cloth 28 of arc water tank bottom surface is then collided, when dust remaining in the mixed airflow is wet by the second dust suction
After cloth 28 is clung, the air for becoming clean is flowed out from exhaust outlet 31.
When the first dust suction wet cloth 26 on the inner wall of exhaust pipe 3, the third wet cloth and arc water that are covered on outside dust-catching board 35
The dust clung on second dust suction wet cloth 28 of the bottom surface of case 27 runs up to constant weight, and weight is more than after adhesion strength, and meeting is certainly
It is dynamic to be detached from dust suction wet cloth, fall into the bottom of underground air duct 24.When the dust of 24 bottom of underground air duct accumulates work to a certain extent
Personnel enter interior cleaning.
Claims (9)
1. a kind of application method for the device being dusted using Venturi effect, which includes equipped with the stone roller sand for grinding sand equipment
Workshop, it is characterized in that further including air inlet hole, dust collecting system, exhaust pipe, arc water tank；Dust collecting system is by stone roller sand workshop, leakage dirt
Plate, underground air duct form, and venturi air drain, anti-circular arc wind eaves, underground water mist spraying head, the first suction are sequentially arranged in underground air duct
Dirt wet cloth；Wherein, the cavity that sand workshop top is equipped with air inlet, lower part connection leakage dirt floor are ground；Anti- circular arc wind eaves convex surface downward, side
Edge is connect with leakage dirt floor；The leakage dirt floor is equipped with the hole of multiple leakage dirt, and the anti-circular arc wind eaves is equipped between a plurality of leakage dirt
Gap；Air inlet hole one end is located at ground, and the other end is connect with the venturi air drain of underground air duct one end；The underground air duct other end and row
The the first dust suction wet cloth that can cling dust is arranged in the connection of tracheae lower part, junction；Arc water tank convex surface upward, in bottom plane
Equipped with the second dust suction wet cloth that can cling dust；Arc water tank is connect with exhaust pipe top, and the junction of the two is equipped with exhaust outlet；
It is additionally provided with muti-piece dust-catching board in exhaust pipe, covers third dust suction wet cloth outside dust-catching board；
Exhaust pipe is transparent material, the part toward the north of exhaust pipe, the semicircular cylinder equipped with transparent material production, and semicircular cylinder is located at the
On one dust suction wet cloth, salt deposit is equipped between semicircular cylinder and exhaust pipe；The surface of salt is set as black in salt deposit；
Water mist spraying head is made of water pipe and multiple Small Holes for being arranged on water pipe, and under the hydraulic pressure of tap water, water is from multiple thin
Aperture high speed ejection water column, water column impinge upon the top of underground air duct, are cleaved into water particle, the water particle being dispersed into air, shape
At water mist；One or more underground water mist spraying head is set along the axis of underground air duct；
The application method of the device: on the one hand, when flowing through the convex surface of arc water tank due to external air flow, flow velocity is accelerated, exhaust outlet
Neighbouring pressure reduces, the high air flow direction top of exhaust pipe lower part pressure, forms uprush, outer from exhaust outlet flow direction
Boundary；On the other hand, the salt deposit of the black in exhaust pipe absorbs the heat of sunlight, and heat storage is arranged in salt deposit with heating
Endotracheal air, the air being heated is upward, forms uprush, also flows to from exhaust outlet extraneous；In this way, above-mentioned two strands
Uprush makes extraneous air-flow enter air inlet hole, and when which passes through the venturi air drain of underground air duct, flow velocity is increased,
Pressure becomes smaller, and when then passing through anti-circular arc wind eaves, flow velocity is further increased, and pressure more becomes smaller, so that grinding containing in sand workshop
There is the air of dust to be attracted, across the hole on leakage dirt floor and the gap of anti-circular arc wind eaves, into underground air duct, and then with cocurrent flow
Enter the air-flow in underground air duct and be formed together mixed airflow and flowed towards exhaust pipe direction, the dust in the mixed airflow is first by ground
The water mist that lower water mist spraying head sprays covers, while falling it downward, the micro dust not covered by water mist, in company with gaseous mixture
The third dust suction that stream hits the first dust suction wet cloth of the junction of exhaust pipe lower part and underground air duct and is covered on outside dust-catching board is wet
Cloth, the first wetted dust suction wet cloth and third dust suction wet cloth are clung；Hereafter, which enters exhaust pipe, and is being vented
Rise in pipe, then collide the second dust suction wet cloth of arc water tank bottom surface, when dust remaining in the mixed airflow is inhaled by second
After dirt wet cloth is clung, the air for becoming clean is flowed out from exhaust outlet.
2. a kind of application method for the device being dusted using Venturi effect as described in claim 1, it is characterized in that institute
The anti-circular arc wind eaves stated protrudes from venturi air drain top.
3. a kind of application method for the device being dusted using Venturi effect as claimed in claim 1 or 2, it is characterized in that
In underground, cross section is rectangle for the underground air duct setting.
4. a kind of application method for the device being dusted using Venturi effect as claimed in claim 3, it is characterized in that institute
The stone roller sand workshop stated is communicated by the hole on leakage dirt floor and the gap of anti-circular arc wind eaves with underground air duct.
5. a kind of application method for the device being dusted using Venturi effect as claimed in claim 4, it is characterized in that institute
The water for the arc water tank stated penetrates into the first dust suction wet cloth of the junction of exhaust pipe lower part and underground air duct by connecting pipe.
6. a kind of application method for the device being dusted using Venturi effect as claimed in claim 5, it is characterized in that institute
The arc water tank bottom surface stated is equipped with multiple micro holes, and the water oozed out from micro hole is absorbed by the second dust suction wet cloth.
7. a kind of application method for the device being dusted using Venturi effect as claimed in claim 6, it is characterized in that institute
The water for the arc water tank stated is penetrated into wet positioned at exhaust pipe lower part and the first dust suction of underground air duct junction by connecting pipe
In third wet cloth outside cloth and dust-catching board.
8. a kind of application method for the device being dusted using Venturi effect as claimed in claim 7, it is characterized in that institute
Sewer is set in the underground air duct stated, and sewer is connected with spillway, and spillway leads to the external world；Open caisson is set in spillway, in open caisson
Buoyancy gate is set.
9. a kind of application method for the device being dusted using Venturi effect as claimed in claim 8, it is characterized in that institute
The buoyancy gate stated is a rectangular housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018109438024 | 2018-08-18 | ||
| CN201810943802 | 2018-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109157938A true CN109157938A (en) | 2019-01-08 |
Family
ID=64878750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811226183.3A Pending CN109157938A (en) | 2018-08-18 | 2018-10-22 | A kind of application method for the device being dusted using Venturi effect |
Country Status (1)
| Country | Link |
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| CN (1) | CN109157938A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112050341A (en) * | 2020-09-10 | 2020-12-08 | 南京长江都市建筑设计股份有限公司 | Toilet ventilation system with upper row, lower row and ventilation method |
| GB2620746A (en) * | 2022-07-19 | 2024-01-24 | I/O Electrical & Mech Limited | Contaminated air treatment |
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| CN201988517U (en) * | 2010-11-29 | 2011-09-28 | 浙江双金机械集团有限公司 | Water fog dust-pressing dust hood special for a dry-method sand grinding dust removing complete machine |
| CN102580973A (en) * | 2012-02-23 | 2012-07-18 | 宁波东博电力科技有限公司 | Underground dust collection system |
| CN102251452B (en) * | 2011-04-27 | 2012-10-31 | 杜文娟 | Method for usage of municipal bicycle power-assisted channel |
| CN202506276U (en) * | 2012-02-23 | 2012-10-31 | 宁波东博电力科技有限公司 | Underground dust collection system |
| CN204247006U (en) * | 2014-11-21 | 2015-04-08 | 西安交通大学 | A kind of Venturi air purifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053763A (en) * | 2007-03-09 | 2007-10-17 | 福建鑫泽环保设备工程有限公司 | Circulating suspension state dried method desulfurizing technology and special purpose desulfurizing tower thereof |
| CN201988517U (en) * | 2010-11-29 | 2011-09-28 | 浙江双金机械集团有限公司 | Water fog dust-pressing dust hood special for a dry-method sand grinding dust removing complete machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112050341A (en) * | 2020-09-10 | 2020-12-08 | 南京长江都市建筑设计股份有限公司 | Toilet ventilation system with upper row, lower row and ventilation method |
| CN112050341B (en) * | 2020-09-10 | 2022-03-04 | 南京长江都市建筑设计股份有限公司 | Toilet ventilation system with upper row, lower row and ventilation method |
| GB2620746A (en) * | 2022-07-19 | 2024-01-24 | I/O Electrical & Mech Limited | Contaminated air treatment |
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Application publication date: 20190108 |
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