CN113679974A - Shaking type self-suction respirator - Google Patents
Shaking type self-suction respirator Download PDFInfo
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- CN113679974A CN113679974A CN202110865963.8A CN202110865963A CN113679974A CN 113679974 A CN113679974 A CN 113679974A CN 202110865963 A CN202110865963 A CN 202110865963A CN 113679974 A CN113679974 A CN 113679974A
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- periphery
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- internal thread
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B7/00—Respiratory apparatus
- A62B7/10—Respiratory apparatus with filter elements
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B7/00—Respiratory apparatus
- A62B7/12—Respiratory apparatus with fresh-air hose
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
- A62B9/02—Valves
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- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
The invention discloses a shaking type self-suction respirator, which comprises a breathing mask, an exhaust pipe and an air inlet filtering mechanism, wherein the breathing mask is provided with a breathing hole; when the smoke dust particles are attached to the filter screen, the whole lower sealing cover can be pushed upwards, so that the inner thread ring protrudes and moves upwards on the outer side of the periphery of the floating groove, then loosening, extruding the inner thread ring downwards by the annular elastic pressing piece to move downwards so that the inner thread ring is pressed against the periphery of the upper end of the outer thread ring, so that the filter screen is shaken up and down, the smoke dust particles on the filter screen are deposited downwards under the inertia effect, the smoke dust particles enter the annular containing groove below the periphery along the conical plate for deposition, the gas inlet pipe enters gas from the middle of the conical plate, the separation of the smoke dust particles and the entering gas is realized, the separation of flue gas is realized, meanwhile, the sealing ring body in the floating groove is abutted against the inner side of the periphery of the inner thread ring protrusion, so that sealing is realized, and the smoke dust particles can be quickly and conveniently cleaned.
Description
Technical Field
The invention relates to a shaking type self-priming respirator.
Background
Along with the increasing population, the population is more and more densely populated, if a fire disaster happens, the fire disaster brings certain difficulty to the rescue work of the firefighter, because of the obstruction of the building, large-scale rescue equipment cannot be moved to a fire occurrence area, a fire disaster can generate a large amount of toxic and harmful gas, therefore, the residents need to prepare some breathing devices for emergency escape at home, and the existing self-priming respirator generally comprises a breathing mask and a filter cavity, wherein gas enters from the filter cavity, is filtered and then reaches the breathing mask, however, if the outside smoke is large, the filter screen in the filter cavity can cause a great amount of smoke particles to be attached to the filter screen during filtering, so that the wearer can not breathe smoothly, and then lead to the person of wearing to breathe the difficulty, so need clear up the adnexed smoke and dust granule on the filter screen fast in the short time, the operation is swift convenient moreover.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the problems that: provides a shaking type self-priming respirator which is fast and convenient to operate.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a shaking type self-suction respirator comprises a breathing mask, an exhaust pipe and an inlet air filtering mechanism; an exhaust pipe is arranged on the front side of the breathing mask; an air inlet filtering mechanism is arranged at the lower side of the breathing mask; the inlet gas filtering mechanism comprises an upper connecting cover, a lower sealing cover, a positioning ring, an annular elastic pressing piece, a filter screen, an air inlet pipe and a sealing ring body; the longitudinal section of the upper connecting cover is of an inverted U-shaped structure; the middle of the upper end of the upper connecting cover is connected to the bottom of the breathing mask through a vent pipe; a floating groove is formed in the outer side of the periphery of the middle of the upper connecting cover, an external thread ring protrusion is arranged on the periphery of the lower end of the floating groove, a positioning ring is arranged on the periphery of the upper end of the floating groove, and a sealing ring body is fixedly arranged in the middle of the floating groove; the periphery of the lower end of the positioning ring is provided with an annular elastic pressing piece; the longitudinal section of the lower closing cover is of a U-shaped structure; the periphery of the upper end of the lower sealing cover is provided with an internal thread ring protrusion; the filter screen is arranged in the middle of the inner part of the lower sealing cover; the bottom of the lower sealing cover is provided with a conical plate with a small upper part and a big lower part, and the lower end of the periphery of the conical plate is provided with a downward extending annular accommodating groove; the middle of the bottom of the conical plate is fixedly provided with an air inlet pipe in a penetrating way; the lower sealing cover is rotatably connected to the external thread ring bulge at the lower end of the upper connecting cover through the internal thread ring bulge at the upper end, the internal thread ring bulge is separated after the external thread ring bulge upper thread rotates upwards, and the internal thread ring bulge is separated from the external thread ring bulge upwards and then moves to the outer side of the periphery of the floating groove; the sealing ring body in the floating groove is abutted against the inner sides of the peripheries of the internal thread ring protrusions; the periphery of the lower end of the annular elastic pressing piece elastically presses against the periphery of the upper end of the internal thread ring protrusion.
Further, the device also comprises a telescopic limiting mechanism; two telescopic limiting mechanisms are respectively arranged on two sides of the lower end of the internal thread ring protrusion; both sides of the lower end of the internal thread ring protrusion are respectively provided with a cross-connecting channel; the telescopic limiting mechanism comprises a driving cover, an external thread rod and a limiting floating column; the limiting floating column is installed in the cross-under channel in a sliding clamping mode; an internal thread channel is arranged inside the outer end of the limiting floating column; the driving cover is rotatably clamped around the outer end of the cross-connecting channel; the middle inside the driving cover is provided with an external thread rod; the inner end of the external threaded rod extends into the penetration channel and is screwed with the internal threaded channel in the outer end of the limiting floating column; the external thread rod drives the outer end of the limiting floating column to move into the floating groove from the cross-connecting channel in a rotating mode.
Furthermore, the upper side and the lower side of the interior of the cross-connecting channel are respectively clamped with the sliding grooves; the upper part and the lower part of the outer end of the limiting floating column are respectively provided with a clamping sliding column; the limiting floating column is connected to the clamping sliding grooves on the upper side and the lower side in the cross-connecting channel in a sliding and clamping mode through clamping sliding columns above and below the outer end.
Furthermore, a rotary clamping ring is arranged around the inner end of the driving cover; the periphery of the outer end of the cross-connecting channel is provided with a rotary clamping groove; the driving cover is rotatably clamped on the rotating clamping grooves on the periphery of the outer end of the cross-connecting channel through the rotating clamping rings on the periphery of the inner end of the driving cover.
Further, a sealing ring is arranged on the outer side of the periphery of the external thread rod; the peripheral outer side of the sealing ring is abutted against the peripheral side wall of the cross-connecting channel.
Further, the cooling device also comprises a cooling pipe; the lower end of the interior of the upper connecting cover is provided with a sealing plate; the cooling pipe is of a bent S-shaped structure; the lower end of the cooling pipe is connected to the closing plate in a penetrating manner; the lower end of the cooling pipe is communicated with the lower sealing cover.
Furthermore, fixing rings are arranged around the middle inside the lower sealing cover; a filter screen is arranged in the middle of the fixing ring; the fixing ring is made of elastic rubber material.
Further, an exhaust check valve is arranged on the exhaust pipe.
Further, an air inlet check valve is arranged on the air inlet pipe.
The invention has the advantages of
1. The invention rotationally connects the lower sealing cover to the external thread ring bulge at the lower end of the upper connecting cover through the internal thread ring bulge at the upper end, the internal thread ring bulge is separated after the upper thread of the external thread ring bulge rotates upwards, the internal thread ring bulge is separated upwards from the external thread ring bulge and then moves to the peripheral outer side of the floating groove, so that the internal thread ring bulge is separated from the constraint of the external thread ring bulge, the internal thread ring bulge can float up and down on the peripheral outer side of the floating groove, the periphery of the lower end of the annular elastic pressing piece is elastically pressed around the upper end of the internal thread ring bulge, when smoke particles are attached to the filter screen, the whole lower sealing cover can be pushed upwards, so that the internal thread ring bulge moves upwards on the peripheral outer side of the floating groove, then the internal thread ring bulge is loosened, the internal thread ring bulge is downwards pressed by the annular elastic pressing piece to move downwards, so that the internal thread ring bulge is pressed around the upper end of the external thread ring bulge, therefore, the filter screen is shaken up and down, smoke particles on the filter screen are deposited downwards under the action of inertia, the smoke particles enter the annular containing groove below the periphery along the conical plate for deposition, the air inlet pipe enters air from the middle of the conical plate, the separation of the smoke particles from the entering air is realized, the separation of smoke and dust is realized, meanwhile, the sealing ring body in the floating groove is abutted to the inner side of the periphery of the internal thread ring protrusion, the sealing is realized, and the invention can quickly and conveniently clean the smoke particles.
2. In order to limit the up-and-down moving position of the internal thread ring bulge, prevent the internal thread ring bulge from moving upwards and separating from the sealing ring body to cause gas pollution inside the upper connecting cover, and prevent the collision on the periphery of the upper end of the external thread ring bulge when the internal thread ring bulge moves downwards, the telescopic limiting mechanism is additionally arranged, the external thread rod is driven to rotate by rotating the driving cover, the external thread rod drives the outer end of the limiting floating column to move from the cross-connecting channel into the floating groove, so that the outer end of the limiting floating column is limited between the sealing ring body and the external thread ring bulge, the internal thread ring bulge cannot separate from the sealing ring body upwards, and cannot collide with the external thread ring bulge downwards, the structural design is ingenious, and the telescopic driving is convenient.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged schematic view of the breathing mask and the upper connecting cover of the present invention.
Fig. 3 is an enlarged schematic view of the lower closure cap of the present invention.
FIG. 4 is a schematic view of a side view of the inlet filter mechanism according to the present invention.
Fig. 5 is an enlarged schematic structural view of the telescopic limiting mechanism at a position in fig. 4 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, a self-priming respirator of shaking type comprises a breathing mask 1, an exhaust pipe 2, an inlet air filtering mechanism 3; an exhaust pipe 2 is arranged at the front side of the breathing mask 1; an air inlet filtering mechanism 3 is arranged at the lower side of the breathing mask 1; the air inlet filtering mechanism 3 comprises an upper connecting cover 31, a lower closing cover 32, a positioning ring 33, an annular elastic pressing piece 34, a filter screen 37, an air inlet pipe 36 and a sealing ring body 35; the longitudinal section of the upper connecting cover 31 is of an inverted U-shaped structure; the middle of the upper end of the upper connecting cover 31 is connected with the bottom of the breathing mask 1 through a breather pipe 5; a floating groove 311 is formed in the outer side of the periphery of the middle of the upper connecting cover 31, an external thread annular protrusion 312 is formed in the periphery of the lower end of the floating groove 311, a positioning ring 33 is arranged on the periphery of the upper end of the floating groove 311, and a sealing ring body 35 is fixedly arranged in the middle of the inner part of the floating groove 311; an annular elastic pressing piece 34 is arranged around the lower end of the positioning ring 33; the longitudinal section of the lower closing cover 32 is in a U-shaped structure; an internal thread ring protrusion 321 is arranged around the upper end of the lower sealing cover 32; the filter screen 37 is arranged in the middle of the inner part of the lower closing cover 32; a conical plate 322 with a small upper part and a large lower part is arranged at the bottom of the lower sealing cover 32, and an annular accommodating groove 323 extending downwards is arranged at the lower end of the periphery of the conical plate 322; the middle of the bottom of the conical plate 322 is fixedly connected with an air inlet pipe 36; the lower closing cap 32 is rotatably connected to the external thread ring protrusion 312 at the lower end of the upper connecting cap 31 through the internal thread ring protrusion 321 at the upper end, the internal thread ring protrusion 321 is disengaged after the thread on the external thread ring protrusion 312 is rotated upwards, and the internal thread ring protrusion 321 is disengaged from the external thread ring protrusion 312 upwards and then moves to the outer side of the periphery of the floating groove 311; the sealing ring body 35 in the floating groove 311 is abutted against the inner side of the periphery of the internal thread ring protrusion 321; the periphery of the lower end of the annular elastic pressing piece 34 elastically presses against the periphery of the upper end of the internal thread ring protrusion 321.
As shown in fig. 1 to 5, it is further preferable that the device further comprises a telescopic limiting mechanism 4; two telescopic limiting mechanisms 4 are respectively arranged on two sides of the lower end of the internal thread ring protrusion 321; two cross-connecting channels 3211 are respectively arranged on two sides of the lower end of the internal thread ring protrusion 321; the telescopic limiting mechanism 4 comprises a driving cover 41, an external thread rod 42 and a limiting floating column 43; the cross-connecting channel 3211 is internally provided with a limiting floating column 43 in a sliding clamping manner; an internal thread channel 431 is arranged inside the outer end of the limiting floating column 43; the driving cover 41 is rotatably clamped around the outer end of the cross-connecting channel 3211; an external thread rod 42 is arranged in the middle of the inner part of the driving cover 41; the inner end of the external thread rod 42 extends to the interior of the through channel 3211 and is screwed with the internal thread channel 431 inside the outer end of the limiting floating column 43; the external threaded rod 42 rotationally drives the outer end of the limit floating post 43 to move from the through channel 3211 into the floating groove 311. Further, the upper side and the lower side of the interior of the cross-connecting channel 3211 are respectively clamped with a chute 3213; clamping slide columns 432 are respectively arranged at the upper part and the lower part of the outer end of the limiting floating column 43; the limiting floating column 43 is slidably clamped on the clamping chutes 3213 at the upper and lower sides in the penetrating channel 3211 through the clamping sliding columns 432 at the upper and lower ends of the outer end. Further, a rotary clamping ring 411 is arranged around the inner end of the driving cover 41; the periphery of the outer end of the cross-connecting channel 3211 is provided with a rotary clamping groove 3212; the driving cover 41 is rotatably fastened to the rotary fastening groove 3212 around the outer end of the through channel 3211 by a rotary fastening ring 411 around the inner end. Further, a sealing ring 44 is arranged on the outer side of the periphery of the external thread rod 42; the peripheral outer side of the sealing ring 44 abuts against the peripheral side wall of the through passage 3211. Further, a cooling pipe 7 is also included; the lower end of the inner part of the upper connecting cover 31 is provided with a closing plate 6; the cooling pipe 7 is of a bent S-shaped structure; the lower end of the cooling pipe 7 is connected to the closing plate 6 in a penetrating way; the lower end of the cooling pipe 7 communicates with a lower closing cap 32. Further, a fixing ring 371 is arranged around the middle inside the lower closing cover 32; a filter screen 37 is arranged in the middle of the fixing ring 371; the fixing ring 371 is made of an elastic rubber material. Further, an exhaust check valve 21 is provided on the exhaust pipe 2. Further, an intake check valve 361 is provided on the intake pipe 36.
The invention connects the lower closing cover 32 to the external thread ring convex 312 at the lower end of the upper connecting cover 31 through the internal thread ring convex 321 at the upper end in a thread rotating way, the internal thread ring convex 321 is separated after the thread rotates upwards on the external thread ring convex 312, the internal thread ring convex 321 is separated upwards from the external thread ring convex 312 and moves to the peripheral outer side of the floating groove 311, thus the internal thread ring convex 321 is separated from the constraint of the external thread ring convex 312, the internal thread ring convex 321 can float up and down on the peripheral outer side of the floating groove 311, and the periphery of the lower end of the annular elastic pressing piece 34 is elastically pressed on the periphery of the upper end of the internal thread ring convex 321, when the smoke particles are adhered on the filter screen 37, the whole lower closing cover 32 can be pushed upwards, so that the internal thread ring convex 321 moves upwards on the peripheral outer side of the floating groove 311, then is loosened, and the internal thread ring convex 321 is downwards moved by the annular elastic pressing piece 34, the internal thread ring protrusion 321 is abutted to the periphery of the upper end of the external thread ring protrusion 312, so that the filter screen 37 is shaken up and down, smoke particles on the filter screen 37 are deposited downwards under the action of inertia, the smoke particles enter the annular containing groove 323 below the periphery along the conical plate 322 for deposition, the air inlet pipe 36 enters air from the middle of the conical plate 322, the separation of the smoke particles and the entering air is realized, the separation of smoke is realized, meanwhile, the sealing ring body 35 in the floating groove 311 is abutted to the inner side of the periphery of the internal thread ring protrusion 321, the sealing is realized, and the smoke particles can be cleaned quickly and conveniently.
In order to limit the up-and-down moving position of the internal thread ring protrusion 321, prevent the internal thread ring protrusion 321 from moving upwards and separating from the sealing ring body 35 to cause gas pollution inside the upper connecting cover 31, and prevent the external thread ring protrusion 312 from colliding with the periphery of the upper end of the external thread ring protrusion 312 when moving downwards, the telescopic limiting mechanism 4 is additionally arranged, the external thread rod 42 is driven to rotate by rotating the driving cover 41, the external thread rod 42 drives the outer end of the limiting floating column 43 to move from the penetrating channel 3211 to the floating groove 311 in a rotating manner, so that the outer end of the limiting floating column 43 is limited between the sealing ring body 35 and the external thread ring protrusion 312, the internal thread ring protrusion 321 cannot separate from the sealing ring body 35 upwards, and cannot collide with the external thread ring protrusion 312 downwards, the structural design is ingenious, and the telescopic driving is convenient.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A shaking type self-suction respirator is characterized by comprising a breathing mask, an exhaust pipe and an air inlet filtering mechanism; an exhaust pipe is arranged on the front side of the breathing mask; an air inlet filtering mechanism is arranged at the lower side of the breathing mask; the inlet gas filtering mechanism comprises an upper connecting cover, a lower sealing cover, a positioning ring, an annular elastic pressing piece, a filter screen, an air inlet pipe and a sealing ring body; the longitudinal section of the upper connecting cover is of an inverted U-shaped structure; the middle of the upper end of the upper connecting cover is connected to the bottom of the breathing mask through a vent pipe; a floating groove is formed in the outer side of the periphery of the middle of the upper connecting cover, an external thread ring protrusion is arranged on the periphery of the lower end of the floating groove, a positioning ring is arranged on the periphery of the upper end of the floating groove, and a sealing ring body is fixedly arranged in the middle of the floating groove; the periphery of the lower end of the positioning ring is provided with an annular elastic pressing piece; the longitudinal section of the lower closing cover is of a U-shaped structure; the periphery of the upper end of the lower sealing cover is provided with an internal thread ring protrusion; the filter screen is arranged in the middle of the inner part of the lower sealing cover; the bottom of the lower sealing cover is provided with a conical plate with a small upper part and a big lower part, and the lower end of the periphery of the conical plate is provided with a downward extending annular accommodating groove; the middle of the bottom of the conical plate is fixedly provided with an air inlet pipe in a penetrating way; the lower sealing cover is rotatably connected to the external thread ring bulge at the lower end of the upper connecting cover through the internal thread ring bulge at the upper end, the internal thread ring bulge is separated after the external thread ring bulge upper thread rotates upwards, and the internal thread ring bulge is separated from the external thread ring bulge upwards and then moves to the outer side of the periphery of the floating groove; the sealing ring body in the floating groove is abutted against the inner sides of the peripheries of the internal thread ring protrusions; the periphery of the lower end of the annular elastic pressing piece elastically presses against the periphery of the upper end of the internal thread ring protrusion.
2. The dithered self-priming respirator of claim 1, further comprising a telescoping stop mechanism; two telescopic limiting mechanisms are respectively arranged on two sides of the lower end of the internal thread ring protrusion; both sides of the lower end of the internal thread ring protrusion are respectively provided with a cross-connecting channel; the telescopic limiting mechanism comprises a driving cover, an external thread rod and a limiting floating column; the limiting floating column is installed in the cross-under channel in a sliding clamping mode; an internal thread channel is arranged inside the outer end of the limiting floating column; the driving cover is rotatably clamped around the outer end of the cross-connecting channel; the middle inside the driving cover is provided with an external thread rod; the inner end of the external threaded rod extends into the penetration channel and is screwed with the internal threaded channel in the outer end of the limiting floating column; the external thread rod drives the outer end of the limiting floating column to move into the floating groove from the cross-connecting channel in a rotating mode.
3. The jittering self-priming respirator of claim 2, wherein the upper and lower sides of the interior of the cross-over channel are respectively clamped with a sliding groove; the upper part and the lower part of the outer end of the limiting floating column are respectively provided with a clamping sliding column; the limiting floating column is connected to the clamping sliding grooves on the upper side and the lower side in the cross-connecting channel in a sliding and clamping mode through clamping sliding columns above and below the outer end.
4. The dithered self-priming respirator of claim 2, wherein the drive cap has a rotating snap ring around its inner end; the periphery of the outer end of the cross-connecting channel is provided with a rotary clamping groove; the driving cover is rotatably clamped on the rotating clamping grooves on the periphery of the outer end of the cross-connecting channel through the rotating clamping rings on the periphery of the inner end of the driving cover.
5. The jittered self-priming respirator of claim 2, wherein a seal ring is arranged around the outside of the externally threaded rod; the peripheral outer side of the sealing ring is abutted against the peripheral side wall of the cross-connecting channel.
6. The dithered self-priming respirator of claim 1, further comprising a cooling tube; the lower end of the interior of the upper connecting cover is provided with a sealing plate; the cooling pipe is of a bent S-shaped structure; the lower end of the cooling pipe is connected to the closing plate in a penetrating manner; the lower end of the cooling pipe is communicated with the lower sealing cover.
7. The dithered self-priming respirator of claim 1, wherein said lower closure cap has a retaining ring around the center of its interior; a filter screen is arranged in the middle of the fixing ring; the fixing ring is made of elastic rubber material.
8. The dithered self-priming respirator of claim 1, wherein the exhaust tubing is provided with an exhaust check valve.
9. The dithered self-priming respirator of claim 1, wherein the intake tube is provided with an intake check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110865963.8A CN113679974B (en) | 2021-07-29 | 2021-07-29 | Shaking type self-suction respirator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110865963.8A CN113679974B (en) | 2021-07-29 | 2021-07-29 | Shaking type self-suction respirator |
Publications (2)
| Publication Number | Publication Date |
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| CN113679974A true CN113679974A (en) | 2021-11-23 |
| CN113679974B CN113679974B (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110865963.8A Active CN113679974B (en) | 2021-07-29 | 2021-07-29 | Shaking type self-suction respirator |
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| CN (1) | CN113679974B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116077848A (en) * | 2023-02-27 | 2023-05-09 | 江苏海拓科技有限公司 | Double-deck floating filter type respirator |
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| CN213375617U (en) * | 2020-09-10 | 2021-06-08 | 攀枝花恒通钛业有限公司 | Waste gas treatment filtration equipment |
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| EP0511592A1 (en) * | 1991-04-30 | 1992-11-04 | DISPOSITIVI PROTEZIONE INDIVIDUALE - D.P.I. s.r.l. | Protection mask used for operating interventions in polluted environments having an interchangegeable connecting sleeve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116077848A (en) * | 2023-02-27 | 2023-05-09 | 江苏海拓科技有限公司 | Double-deck floating filter type respirator |
| CN116077848B (en) * | 2023-02-27 | 2023-10-20 | 江苏海拓科技有限公司 | Double-deck floating filter type respirator |
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|---|---|
| CN113679974B (en) | 2022-04-05 |
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