CN109011250B

CN109011250B - Gas mask for fire control

Info

Publication number: CN109011250B
Application number: CN201811278236.6A
Authority: CN
Inventors: 王浩; 胡琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-10-30
Filing date: 2018-10-30
Publication date: 2021-05-07
Anticipated expiration: 2038-10-30
Also published as: CN109011250A

Abstract

The invention relates to the field of fire fighting, in particular to a fire fighting gas mask, which comprises a mask, a fixing mechanism, an installation mechanism, a connecting mechanism, a compression mechanism, a filtering mechanism, a placing groove and an exhaust mechanism, wherein the mask is fixedly arranged on the mask; one end of the mask is in threaded connection with the mounting mechanism, the compression mechanism and the filtering mechanism are in sliding connection inside the mounting mechanism, the compression mechanism abuts against the filtering mechanism, after the mask is used in a fire scene, the mounting mechanism is rotated, so that the mounting mechanism is opened, the mounting mechanism slides to drive the compression mechanism to slide inside the mounting mechanism, the compression mechanism and the filtering mechanism are separated, people can conveniently slide the filtering mechanism out of the mounting mechanism, and people can conveniently replace the filtering mechanism; the junction of face guard and installation mechanism is equipped with the standing groove, and standing groove and nose laminating, the inside of filtering and disinfecting back air admission standing groove, and the exhaust mechanism contact of the air downstream of people's exhalation and face guard bottom promotes the exhaust mechanism motion, opens the air after exhaust mechanism discharges the breathing.

Description

Gas mask for fire control

Technical Field

The invention relates to the field of fire fighting, in particular to a gas mask for fire fighting.

Background

The gas mask is a personal special labor protection article, is also an individual protective article, is worn on the head to protect the respiratory organs, eyes and face of a person and prevent toxic substances such as poison gas, dust, bacteria, toxic and harmful gas or steam and the like from damaging the personal protective apparatus. The gas mask is widely applied to the fields of petroleum, chemical industry, mines, metallurgy, military, fire fighting, emergency rescue and relief, health and epidemic prevention, scientific and technological environmental protection, mechanical manufacturing and the like, and can play an important role in protecting the personal respiratory system in cities with severe haze and photochemical smog. The gas mask can be divided into a full mask and a half mask from the aspect of modeling, and the full mask is divided into a positive pressure type and a negative pressure type.

When using inside the gas mask entering scene of a fire, the inside dust in scene of a fire is too much, leads to the inside that a large amount of dusts got into the filter core, easily blocks up the filter core, and the filter core is fixed in gas mask's inside, is difficult to take out the clearance with the filter core, and inconvenient people use next time. In view of this, the present invention provides a fire fighting gas mask, which has the following characteristics:

(1) according to the fire-fighting gas mask, one end of the face mask is in threaded connection with the mounting mechanism, the compression mechanism and the filtering mechanism are connected in the mounting mechanism in a sliding mode, the compression mechanism abuts against the filtering mechanism, after the fire-fighting gas mask is used in a fire scene, the mounting mechanism is rotated, the mounting mechanism is opened, the mounting mechanism slides to drive the compression mechanism to slide in the mounting mechanism, the compression mechanism and the filtering mechanism are separated, people can conveniently slide the filtering mechanism out of the mounting mechanism, and people can conveniently replace the filtering mechanism.

(2) According to the fire-fighting gas mask, the placing groove with the arc-shaped side wall is arranged at the connecting part of the face mask and the mounting mechanism, the placing groove is attached to the nose, filtered and disinfected air enters the placing groove, so that people can breathe clean air, the air exhaled by people moves downwards to be in contact with the exhaust mechanism at the bottom end of the face mask, the exhaust mechanism is pushed to move, the bottom end of the face mask is opened, the breathed air is conveniently exhausted, and after waste gas is exhausted, the exhaust mechanism moves in a reset mode to seal the bottom end of the face mask, so that the air in a fire scene is prevented from directly entering the face mask.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a fire-fighting gas mask, one end of a face mask is in threaded connection with an installation mechanism, the interior of the installation mechanism is in sliding connection with a compression mechanism and a filtering mechanism, the compression mechanism is abutted against the filtering mechanism, after the fire-fighting gas mask is used in a fire scene, the installation mechanism is rotated, so that the installation mechanism is opened, the installation mechanism slides to drive the compression mechanism to slide in the installation mechanism, the compression mechanism is separated from the filtering mechanism, people can conveniently slide the filtering mechanism out of the interior of the installation mechanism, people can conveniently replace the filtering mechanism, a placing groove with an arc-shaped side wall is arranged at the joint of the face mask and the installation mechanism, the placing groove is attached to a nose, filtered and disinfected air enters the interior of the placing groove, people can breathe clean air, and air exhaled by people moves downwards to be in contact with an exhaust, the bottom end of the face mask is opened, air after breathing is conveniently discharged, and after waste gas is discharged, the bottom end of the face mask is closed by the resetting motion of the exhaust mechanism, so that the air in a fire scene is prevented from directly entering the face mask.

The technical scheme adopted by the invention for solving the technical problems is as follows: a fire-fighting gas mask comprises a mask, a fixing mechanism, an installation mechanism, a connecting mechanism, a compression mechanism, a filtering mechanism, a placing groove and an exhaust mechanism; the fixing mechanisms are symmetrically arranged on the side walls of the two ends of the face mask respectively, the mounting mechanism is arranged at the bottom end of the face mask, and the placing groove is formed in the joint of the mounting mechanism and the face mask; the bottom end of the mask is provided with the exhaust mechanism, and the exhaust mechanism is communicated with the placing groove; the filtering mechanism is arranged in the mounting mechanism and is in sliding connection with the inside of the mounting mechanism; one end of the filtering mechanism props against the compressing mechanism, and the compressing mechanism is in sliding connection with the inside of the mounting mechanism; one end of the compression mechanism is provided with the connecting mechanism, and the connecting mechanism is in sliding connection with the inside of the mounting mechanism.

Specifically, the fixing mechanism comprises a strap and a buckle, the strap is symmetrically arranged on the side wall of the mask, and the buckle is arranged at one end of the strap.

Specifically, the mounting mechanism comprises a mounting block, a first cylinder, a filter cover and a second cylinder, the mounting block with an arc-shaped side wall is mounted at the bottom end of the mask, and the interior of the mounting block is in threaded connection with one end of the first cylinder; the inside of the first cylinder body with the lateral wall is "T" shape with threaded connection between one end of the second cylinder body, and threaded connection between the other end of the second cylinder body and the filter mantle.

Specifically, filtering mechanism includes filter core and funnel, first barrel inside sliding connection the lateral wall is "T" shape the filter core, first barrel with the inside sliding connection of second barrel the funnel, the one end of funnel is contradicted the filter core, just the minimum diameter of filter core is greater than the inside minimum internal diameter of first barrel, the minimum diameter of funnel equals the maximum internal diameter of second barrel.

Specifically, the compressing mechanism includes first dead lever, second dead lever and first spring, the equidistance installation of the one end edge of funnel first dead lever, first dead lever with the inside sliding connection of second dead lever, just the one end of first dead lever with install between the inside one end of second dead lever first spring, first dead lever with the second dead lever with the inside of second barrel rotates and is connected.

Specifically, the connecting mechanism comprises a groove, a ball, a support frame and a connecting sleeve, the connecting sleeve is symmetrically arranged at the turning part in the second cylinder, and the groove with the T-shaped section is arranged in the connecting sleeve; the both ends of recess are fixed connection respectively the ball, the lateral wall of ball rotates to be connected the support frame, the one end fixed connection of support frame the second dead lever, just the support frame with the inside of recess rotates to be connected.

Specifically, the exhaust mechanism comprises a filter screen, a second spring, a fixed funnel, a piston and an exhaust pipe, the mounting block is internally provided with an arc-shaped placing groove, and the exhaust pipe is mounted at the bottom end of the face shield; the exhaust pipe with the funnel-shaped top end is communicated with the placing groove; the inside fixed connection of blast pipe the filter screen with fixed funnel, fixed funnel's inside block and sliding connection the piston, just the bottom surface of piston with install between the top surface of filter screen the second spring, the piston is "T" shape, just the maximum diameter of piston is greater than fixed funnel's minimum internal diameter.

The invention has the beneficial effects that:

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of a preferred embodiment of a fire protection respirator of the present invention;

FIG. 2 is a schematic view of the internal structure of the mounting mechanism shown in FIG. 1;

FIG. 3 is a schematic view of the internal structure of the connection mechanism shown in FIG. 2;

fig. 4 is a schematic view of the bottom end structure of the mask shown in fig. 1.

In the figure: 1. mask, 2, fixed establishment, 21, frenulum, 22, buckle, 3, installation mechanism, 31, installation piece, 32, first barrel, 33, filter mantle, 34, second barrel, 4, coupling mechanism, 41, recess, 42, ball, 43, support frame, 44, adapter sleeve, 5, compressing mechanism, 51, first dead lever, 52, second dead lever, 53, first spring, 6, filter mechanism, 61, filter core, 62, funnel, 7, standing groove, 8, exhaust mechanism, 81, filter screen, 82, second spring, 83, fixed funnel, 84, piston, 85, blast pipe.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1-4, the gas mask for fire fighting of the present invention comprises a face mask 1, a fixing mechanism 2, an installation mechanism 3, a connection mechanism 4, a compression mechanism 5, a filtering mechanism 6, a placing groove 7 and an exhaust mechanism 8; the fixing mechanisms 2 are symmetrically arranged on the side walls of the two ends of the face mask 1 respectively, the mounting mechanism 3 is arranged at the bottom end of the face mask 1, and the placing groove 7 is arranged at the joint of the mounting mechanism 3 and the face mask 1; the exhaust mechanism 8 is arranged at the bottom end of the mask 1, and the exhaust mechanism 8 is communicated with the placing groove 7; the filtering mechanism 6 is arranged inside the mounting mechanism 3, and the filtering mechanism 6 is connected with the inside of the mounting mechanism 3 in a sliding way; one end of the filtering mechanism 6 abuts against the compressing mechanism 5, and the compressing mechanism 5 is in sliding connection with the inside of the mounting mechanism 3; one end of the compression mechanism 5 is provided with the connecting mechanism 4, and the connecting mechanism 4 is in sliding connection with the inside of the mounting mechanism 3.

Specifically, the fixing mechanism 3 includes a strap 21 and a buckle 22, the strap 21 is symmetrically installed on the side wall of the face mask 1, the buckle 22 is installed on one end of the strap 21, and the strap 21 and the buckle 22 are used for conveniently fixing the face mask 1 on the face of a firefighter.

Specifically, the mounting mechanism 3 comprises a mounting block 31, a first cylinder 32, a filter cover 33 and a second cylinder 34, the mounting block 31 with an arc-shaped side wall is mounted at the bottom end of the mask 1, and the inside of the mounting block 31 is in threaded connection with one end of the first cylinder 32; the inside of first barrel 32 that the lateral wall is "T" shape with threaded connection between the one end of second barrel 34, just the other end of second barrel 34 with threaded connection between the filter mantle 32, for the convenience the lateral wall installation of installation piece 31 first barrel 31, and for the convenience the lateral wall installation of second barrel 34 filter mantle 33, again with second barrel 34 slides in the inside of first barrel 32 to the convenience air runs through in proper order filter mantle 33, second barrel 34, first barrel 32 with installation piece 31 gets into the inside of face guard 1.

Specifically, the filtering mechanism 6 comprises a filter element 61 and a funnel 62, the first cylinder 32 is connected with the filter element 61 with the T-shaped side wall in a sliding way, the interior of the first cylinder 32 and the second cylinder 34 is slidably connected to the funnel 62, one end of the funnel 62 abuts against the filter element 61, and the minimum diameter of the filter element 61 is greater than the minimum inner diameter of the interior of the first cylinder 32, the minimum diameter of the funnel 62 is equal to the maximum inner diameter of the second cylinder 34, to facilitate sliding of the funnel 62 within the first and second barrels 32, 34 to compress the cartridge 61 within the first barrel 32, the cartridge 61 conforms to the inner sidewall of the first barrel 32, thereby facilitating the gas in the second cylinder 34 to penetrate the filter element 61 into the mask 1, so that the filter element 61 can filter the air uniformly.

Specifically, the compressing mechanism 5 includes a first fixing rod 51, a second fixing rod 52 and a first spring 53, the first fixing rod 51 is installed at an edge of one end of the funnel 62 at an equal distance, the first fixing rod 51 is slidably connected with an inner portion of the second fixing rod 52, the first spring 53 is installed between one end of the first fixing rod 51 and one end of an inner portion of the second fixing rod 52, the first fixing rod 51 and the second fixing rod 52 are rotatably connected with an inner portion of the second cylinder 34, in order to facilitate the sliding of the second cylinder 34 in the inner portion of the first cylinder 32, the second cylinder 34 compresses the first fixing rod 51, the first fixing rod 51 slides into the inner portion of the second fixing rod 52, the first fixing rod 51 compresses the first spring 53 in the inner portion of the second fixing rod 52, and the first spring 53 reversely presses the first fixing rod 51, the first fixing rod 51 is tightly attached to the funnel 62, so that the funnel 62 fixes the filter element 61.

Specifically, the connecting mechanism 4 includes a groove 41, a ball 42, a support frame 43 and a connecting sleeve 44, the connecting sleeve 44 is symmetrically installed at the internal turning point of the second cylinder 34, and the groove 41 with a T-shaped cross section is arranged inside the connecting sleeve 44; the two ends of the groove 41 are respectively fixedly connected with the balls 42, the side wall of each ball 42 is rotatably connected with the support frame 43, one end of each support frame 43 is fixedly connected with the second fixing rod 52, the support frames 43 are rotatably connected with the inside of the groove 41, so that in order to facilitate the rotation of the second cylinder 44 in the first cylinder 42, the connection sleeve 44 rotates, the groove 41 rotates on the side walls of the support frames 43 and the balls 42, the balls 42 roll to reduce the friction force between the support frames 43 and the grooves 41, the support frames 43 are fixed inside the connection sleeve 44, the support frames 43 fix the compression mechanism 5 inside the second cylinder 34, the second cylinder 34 rotates, the support frames 43 do not rotate, and therefore the compression mechanism 5 does not rotate, and the funnel 62 is tightly pressed down by the compression mechanism 5, thereby facilitating rotation of the second cylinder 34.

Specifically, the exhaust mechanism 8 includes a filter screen 81, a second spring 82, a fixed funnel 83, a piston 84 and an exhaust pipe 85, the mounting block 31 is provided with the arc-shaped placing groove 7 inside, and the exhaust pipe 85 is mounted at the bottom end of the mask 1; the exhaust pipe 85 with a funnel-shaped top end is communicated with the placing groove 7; the inside fixed connection of blast pipe 85 the filter screen 81 with fixed funnel 83, the inside block and the sliding connection of fixed funnel 83 piston 84, just the bottom surface of piston 84 with install between the top surface of filter screen 81 second spring 82, piston 84 is "T" shape, just the maximum diameter of piston 84 is greater than the minimum internal diameter of fixed funnel 83. In order to facilitate the exhaled air to move downwards in the placement groove 7 and enter the exhaust pipe 85, the air enters the fixed funnel 83, the piston 84 is pushed to move in the fixed funnel 83, the piston 84 moves to compress the second spring 82 on the top surface of the filter screen 81, the fixed funnel 83 is opened, the air penetrates through the fixed funnel 83, the filter screen 81 and the exhaust pipe 85, the exhaled air is conveniently discharged, and after the air is discharged, the second spring 82 extends to push the piston 84 to ascend, so that the piston 84 closes the fixed funnel 83, the exhaust pipe 85 is closed, and dust in the fire scene is prevented from entering the interior of the mask 1 through the exhaust pipe 85.

In use, the filter insert 61 having a "T" shaped sidewall is slid into the interior of the first barrel 32 having a "T" shaped sidewall, and the filter insert 61 is pressed downward such that the filter insert 61 slides into the interior of the first barrel 32. Sliding the second cylinder 34 and the funnel 62 into the interior of the first cylinder 32, rotating the second cylinder 34 into the interior of the first cylinder 32, and the second cylinder 34 bringing the funnel 62 into contact with one end of the filter element 61 into the interior of the first cylinder 32. The second cylinder 34 continues to move downwards, the funnel 62 presses the filter element 61 downwards, the filter element 61 presses the funnel 62 reversely, the funnel 62 pushes the first fixing rod 51 reversely to slide into the second fixing rod 52, the first fixing rod 51 moves to press the first spring 53 inside the second fixing rod 52, the first spring 53 presses the first fixing rod 51 and the funnel 62 reversely, the diameter of the funnel 62 is equal to the maximum inner diameter of the second cylinder 34, the funnel 62 linearly moves to press the filter element 61 downwards, the filter element 61 is pressed and deformed, and the filter element 61 is tightly attached to the inner side wall of the second cylinder 34. When the second cylinder 34 rotates inside the first cylinder 32, the second cylinder 34 drives the connecting sleeve 44 to rotate, the connecting sleeve 44 rotates to drive the groove 41 to rotate, so that the groove 41 rotates on the side walls of the supporting frame 43 and the balls 42, the groove 41 drives the balls 42 to rotate inside the groove 41, friction between the balls 42 and the inner side walls of the supporting frame 43 and the groove 41 is reduced, and the rotation of the groove 41 and the connecting sleeve 44 is facilitated. When the second barrel 34 rotates in the first barrel 32, the compression mechanism 5 and the funnel 62 at one end of the support frame 43 do not rotate, the funnel 62 is tightly attached to the filter element 61, meanwhile, the second barrel 34 can move in the first barrel 32 conveniently, one end of the second barrel 34 is in threaded connection with the filter cover 33, the first barrel 32 is in threaded connection with the mounting block 31, the mask 1 is buckled on the face, the nose is located in the placing groove 7, and the mask 1 is fixed on the face by the aid of the tying belts 21 and the buckles 22 and can be used. In the use, the inside air in the scene of a fire runs through filter cover 33 and gets into the inside of second barrel 34, filter cover 33 filters some dust of air for the first time, the air gets into second barrel 34 in proper order, filter core 61, first barrel 32 and installation piece 31 get into the inside of standing groove 7, the inside wall of first barrel 32 is hugged closely to filter core 61, make filter core 61 with the inside filtration of first barrel 32 and second barrel 34, get into the inside of standing groove 7 after filtering the air disinfection, make people breathe fresh air. When people exhale, gas moves down in the inside of standing groove 7, gas gets into the inside of top infundibulate blast pipe 85, gas gets into the inside of fixed funnel 83, promote piston 84 at the inside motion of fixed funnel 83, the second spring 82 of piston 84 motion compression filter screen 81 top surface, open fixed funnel 83, make gas run through fixed funnel 83, filter screen 81 and blast pipe 85, the convenience is discharged the gas of exhaling, and gaseous exhaust back, second spring 82 extends, it rises to promote piston 84, make piston 84 seal fixed funnel 83, thereby seal blast pipe 85, prevent that the inside dust of scene of a fire from getting into the inside of face guard 1 through blast pipe 85. After the mask is used, the buckle 22 and the tying belt 21 are unfastened, the mask 1 is taken down, the first cylinder body 32 is rotated to be taken down from the side wall of the mounting block 31, the rotary filter cover 33 is taken out from one end of the second cylinder body 34, the second cylinder body 34 is rotated to slide out from the first cylinder body 32, the funnel 62 is separated from the filter element 61, the filter element 61 is taken out from the first cylinder body 32, and the filter element 61 and the filter cover 33 are cleaned.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A fire-fighting gas mask is characterized in that: comprises a mask (1), a fixing mechanism (2), an installation mechanism (3), a connecting mechanism (4), a compression mechanism (5), a filtering mechanism (6), a placing groove (7) and an exhaust mechanism (8); the fixing mechanisms (2) are symmetrically arranged on the side walls of the two ends of the face mask (1) respectively, the mounting mechanism (3) is arranged at the bottom end of the face mask (1), and the placing groove (7) is formed in the connecting part of the mounting mechanism (3) and the face mask (1); the bottom end of the mask (1) is provided with the exhaust mechanism (8), and the exhaust mechanism (8) is communicated with the placing groove (7); the filtering mechanism (6) is arranged in the mounting mechanism (3), and the filtering mechanism (6) is in sliding connection with the inside of the mounting mechanism (3); one end of the filtering mechanism (6) abuts against the compressing mechanism (5), and the compressing mechanism (5) is in sliding connection with the inside of the mounting mechanism (3); one end of the compression mechanism (5) is provided with the connecting mechanism (4), and the connecting mechanism (4) is connected with the inside of the mounting mechanism (3) in a sliding manner;

the fixing mechanism (3) comprises a lace (21) and a buckle (22), the lace (21) is symmetrically installed on the side wall of the mask (1), and the buckle (22) is installed at one end of the lace (21);

the mounting mechanism (3) comprises a mounting block (31), a first cylinder (32), a filter cover (33) and a second cylinder (34), the mounting block (31) with the arc-shaped side wall is mounted at the bottom end of the mask (1), and the interior of the mounting block (31) is in threaded connection with one end of the first cylinder (32); the inside of the first cylinder (32) with the T-shaped side wall is in threaded connection with one end of the second cylinder (34), and the other end of the second cylinder (34) is in threaded connection with the filter cover (33);

the filtering mechanism (6) comprises a filter element (61) and a funnel (62), the filter element (61) with the T-shaped side wall is slidably connected with the inside of the first cylinder (32), the funnel (62) is slidably connected with the inside of the first cylinder (32) and the second cylinder (34), one end of the funnel (62) is abutted against the filter element (61), the minimum diameter of the filter element (61) is larger than the minimum inner diameter of the inside of the first cylinder (32), and the minimum diameter of the funnel (62) is equal to the maximum inner diameter of the second cylinder (34);

the compression mechanism (5) comprises a first fixing rod (51), a second fixing rod (52) and a first spring (53), the first fixing rod (51) is installed at the edge of one end of the funnel (62) at equal intervals, the first fixing rod (51) is connected with the inner portion of the second fixing rod (52) in a sliding mode, the first spring (53) is installed between one end of the first fixing rod (51) and one end of the inner portion of the second fixing rod (52), and the first fixing rod (51) and the second fixing rod (52) are connected with the inner portion of the second barrel (34) in a rotating mode;

the connecting mechanism (4) comprises a groove (41), a ball (42), a support frame (43) and a connecting sleeve (44), the connecting sleeve (44) is symmetrically installed at the turning position inside the second cylinder (34), and the groove (41) with the T-shaped cross section is arranged inside the connecting sleeve (44); the two ends of the groove (41) are respectively fixedly connected with the ball (42), the side wall of the ball (42) is rotatably connected with the support frame (43), one end of the support frame (43) is fixedly connected with the second fixing rod (52), and the support frame (43) is rotatably connected with the inside of the groove (41);

the exhaust mechanism (8) comprises a filter screen (81), a second spring (82), a fixed funnel (83), a piston (84) and an exhaust pipe (85), the mounting block (31) is internally provided with the arc-shaped placing groove (7), and the exhaust pipe (85) is mounted at the bottom end of the mask (1); the exhaust pipe (85) with the funnel-shaped top end is communicated with the placing groove (7); the filter screen (81) and the fixed funnel (83) are fixedly connected to the inner portion of the exhaust pipe (85), the piston (84) is clamped and slidably connected to the inner portion of the fixed funnel (83), the second spring (82) is installed between the bottom surface of the piston (84) and the top surface of the filter screen (81), the piston (84) is T-shaped, and the maximum diameter of the piston (84) is larger than the minimum inner diameter of the fixed funnel (83);

when the filter element is used, the filter element (61) with the T-shaped side wall slides into the first cylinder body (32) with the T-shaped side wall, and the filter element (61) is pressed downwards to enable the filter element (61) to slide into the first cylinder body (32); sliding the second cylinder (34) and the funnel (62) into the first cylinder (32), rotating the second cylinder (34) to enter the first cylinder (32), and driving the funnel (62) into the first cylinder (32) by the second cylinder (34) to contact with one end of the filter element (61); the second cylinder (34) continues to move downwards, the funnel (62) downwards extrudes the filter element (61), the filter element (61) reversely extrudes the funnel (62), the funnel (62) reversely pushes the first fixing rod (51) to slide into the second fixing rod (52), the first fixing rod (51) moves to extrude the first spring (53) in the second fixing rod (52), the first spring (53) reversely extrudes the first fixing rod (51) and the funnel (62), the diameter of the funnel (62) is equal to the maximum inner diameter of the second cylinder (34), the funnel (62) linearly moves to downwards extrude the filter element (61), and the filter element (61) is extruded and deformed to enable the filter element (61) to be tightly attached to the inner side wall of the second cylinder (34); when the second cylinder (34) rotates in the first cylinder (32), the second cylinder (34) drives the connecting sleeve (44) to rotate, the connecting sleeve (44) rotates to drive the groove (41) to rotate, so that the groove (41) rotates on the side walls of the supporting frame (43) and the ball (42), and the groove (41) drives the ball (42) to rotate in the groove (41), so that the friction force between the ball (42) and the inner side walls of the supporting frame (43) and the groove (41) is reduced, and the groove (41) and the connecting sleeve (44) can rotate conveniently; when the second barrel (34) rotates in the first barrel (32), the compression mechanism (5) and the funnel (62) at one end of the support frame (43) do not rotate, the funnel (62) is tightly attached to the filter element (61), meanwhile, the second barrel (34) can conveniently move in the first barrel (32), one end of the second barrel (34) is in threaded connection with the filter cover (33), the first barrel (32) is in threaded connection with the mounting block (31), the mask (1) is buckled on the face, the nose is located in the placing groove (7), and the mask (1) is fixed on the face by using the tying belt (21) and the buckle (22) and can be used; in the using process, air in a fire scene penetrates through the filter cover (33) to enter the second cylinder (34), the filter cover (33) filters some dust of the air for the first time, the air sequentially enters the second cylinder (34), the filter element (61), the first cylinder (32) and the mounting block (31) to enter the placing groove (7), and the filter element (61) is tightly attached to the inner side wall of the first cylinder (32), so that the filter element (61) filters the air in the first cylinder (32) and the second cylinder (34), the air is disinfected and filtered and then enters the placing groove (7), and people can breathe fresh air; when people exhale, gas moves downwards in the placing groove (7), the gas enters the exhaust pipe (85) with a funnel shape at the top end, the gas enters the fixed funnel (83), the piston (84) is pushed to move in the fixed funnel (83), the piston (84) moves to compress the second spring (82) on the top surface of the filter screen (81), the fixed funnel (83) is opened, the gas penetrates through the fixed funnel (83), the filter screen (81) and the exhaust pipe (85), the exhaled gas is conveniently exhausted, and after the gas is exhausted, the second spring (82) extends to push the piston (84) to ascend, so that the piston (84) seals the fixed funnel (83), the exhaust pipe (85) is sealed, and dust in a fire scene is prevented from entering the mask (1) through the exhaust pipe (85); after the mask is used, the buckle (22) and the tying belt (21) are unfastened, the mask (1) is taken down, the first barrel (32) is rotated to be taken down from the side wall of the mounting block (31), the filter cover (33) is rotated to be taken out from one end of the second barrel (34), the second barrel (34) is rotated to slide out from the inside of the first barrel (32), the funnel (62) is separated from the filter element (61), the filter element (61) is taken out from the inside of the first barrel (32), and the filter element (61) and the filter cover (33) are cleaned.