Dustproof mask with high comfort

Abstract

The dustproof mask comprises a mask body, the portion, corresponding to the portion below the nostrils and above the jaw of a wearer, of the surface of the mask body is provided with a front-arched arc-shaped face, and the arc-shaped face is provided with three exhaust channels distributed in the left direction, the middle direction and the right direction. An exhaust structure capable of being connected with one of the exhaust channels is arranged on the arc-shaped face in a sliding mode, when the exhaust structure is connected with one of the exhaust channels, the other two exhaust channels are in a closed state, and the rear ends of the two sides of the cover body are each provided with an air inlet channel. And air inlet structures for feeding air into the air inlet holes are arranged at the rear ends of the two sides of the cover body. The exhaust structure can be adjusted according to the damp and hot positions of the cheeks to be connected to the appropriate exhaust channel, the airflow direction in the mask body is changed, the damp and hot air exhaust efficiency and sweat exhaust efficiency in the mask body are improved, and the dryness and comfort are improved.

Description

Technical Field

[0001] The invention relates to the technical field of dust masks, and in particular to a dust mask with strong comfort. Background Art

[0002] When working in the mining area or underground in a coal mine, workers need to wear dust masks to avoid inhaling a large amount of dust and causing physical damage due to the large amount of dust in the environment. When wearing a dust mask to work, the large amount of hot and humid gas produced by breathing will cause stuffiness and discomfort in the mask area. In addition, the workers are prone to sweating due to physical labor, which will cause the humidity and heat in the internal environment of the mask, making the dust mask extremely uncomfortable to wear for a long time. In order to solve this problem and reduce the feeling of stuffiness, the existing technology usually increases the airflow in and out of the mask in order to quickly remove the hot and humid air in the mask and replenish sufficient oxygen in time.

[0003] For example, the patent with application number 202310869568.6 provides an air purification device for indoor decoration, including an elastic sealing pad, a central mask, a transition elbow, an air intake multiplier mechanism and an exhaust multiplier mechanism, wherein the central mask is arranged on the elastic sealing pad, the transition elbows are symmetrically arranged on both sides of the central mask, the air intake multiplier mechanism is arranged on one of the transition elbows, and the exhaust multiplier mechanism is arranged on the transition elbow away from one end of the air intake multiplier mechanism. The present invention increases the gas flow rate in the dust mask through the air intake multiplier mechanism and the exhaust multiplier mechanism, so that the wearer can get more fresh air. At the same time, the high-flow gas will take away the exhaled moisture and heat, reduce the temperature and humidity in the dust mask, and ensure the dryness of the wearer's face.

[0004] The above is achieved by increasing the flow rate and velocity of the inlet and outlet air by adding an air intake multiplier mechanism and an exhaust multiplier mechanism, so as to more quickly discharge the hot and humid air in the mask and replenish fresh air in time to improve the drying effect.

[0005] However, in the above scheme, fresh air enters from a fixed side and exhausts air from the other side. In this way, the direction of airflow in the protective garment is fixed, and there will be a certain amount of residual humid and hot gas produced by breathing, especially on the wearer's cheek side close to the exhaust side. Since it cannot be directly blown by fresh air, it is very easy to cause discomfort caused by the accumulation of sweat and humid and hot air. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a dust mask with strong comfort.

[0007] The technical solution of the present invention is achieved in this way: A dust mask with strong comfort comprises a mask body, wherein a front-arched curved surface is arranged on the surface of the mask body corresponding to the position below the nostrils and above the chin of the wearer, and three exhaust channels distributed on the left, middle and right sides are arranged on the curved surface, an exhaust structure which can be connected to one of the exhaust channels is slidably arranged on the curved surface, and when the exhaust structure is connected to one of the exhaust channels, the other two exhaust channels are in a closed state, a row of air intake channels are arranged at the rear ends of both sides of the mask body, and air intake structures for intake of air to the air intake holes are arranged at the rear ends of both sides of the mask body.

[0008] Furthermore, air intake covers are provided on both sides of the cover body, the air intake structure is connected to the surface of the air intake cover, an air intake cavity is formed between the air intake cover and the cover body, and the air intake end of the air intake hole is located in the air intake cavity.

[0009] Furthermore, the air intake structure includes an air intake pipe and an air intake fan installed at the bottom of the air intake pipe, and the exhaust structure includes an exhaust pipe and an exhaust fan installed at the bottom of the exhaust pipe.

[0010] Furthermore, the exhaust channel includes a plurality of exhaust holes distributed in a circular array and a rotating plate, the rotating plate is circular, the center of the rotating plate is rotatably mounted on the cover body, the surface of the rotating plate is provided with through holes adapted to the exhaust holes, and the rotating plate opens or closes the exhaust holes by rotating.

[0011] Furthermore, two limit grooves are provided on the outer side surface of the rotating plate and are symmetrically distributed in the upper and lower parts, one end of the limit groove is an open end, and the other end is a closed end, and the closed end is located on the diameter line of the rotating plate, and a rotating ring is provided at the rear end of the exhaust structure, and two first limit protrusions corresponding to the limit grooves are provided on the rear end surface of the rotating ring, wherein when the open end is in a tilted upward state, the rotating plate closes the exhaust channel, and when the open end is in a horizontal state and faces the exhaust structure, the first limit protrusion can enter the limit groove from the open end.

[0012] Furthermore, an arcuate channel is provided on the front side of the cover body, and an arcuate slider is provided on the rear end rotating sleeve of the swivel, the arcuate slider is slidably matched with the arcuate channel, and the rear end surface of the arcuate slider is in contact with the cover body.

[0013] Furthermore, a first arcuate groove for sliding of the first limiting protrusion is arranged on the inner wall surface of the rear end of the arcuate channel, a second limiting protrusion is arranged on the center of the rear end surface of the swivel ring and on both sides of the front end surface of the arcuate slider, and a second arcuate groove for sliding of the second limiting protrusion is arranged on the inner wall surface of the rear side of the arcuate groove, the second arcuate groove is at the same height as the center of the rotating plate, and the width and depth of the limiting groove, the first arcuate groove and the second arcuate groove are the same.

[0014] Furthermore, the air inlet channel includes an air inlet hole and a sealing plate, the air inlet holes are equidistantly arranged at the rear end of the side surface of the cover body in the height direction, the air inlet holes are inclined with the air outlet end facing the curved surface, the sealing plate is slidably installed inside the cover body, the sealing plate blocks the air outlet end of the air inlet hole by moving backward, and when the exhaust structure is connected to the exhaust channel on the left or right side, the sealing plate on the left or right side is pushed respectively to block the air inlet hole on the corresponding side.

[0015] Furthermore, a side top plate is provided on the air intake structure, and a force storage spring is provided between the sealing plate and the cover body, and the force storage spring is used to keep the sealing plate separated from the air intake hole. When the air intake structure is connected to the exhaust channel located on the left or right side, the sealing plate drives the sealing plate located on the left or right side to move backward to block the air intake hole on the corresponding side.

[0016] Furthermore, both ends of the arc-shaped channel are provided with through grooves for the end of the side top plate to insert and squeeze the sealing plate, and when the air inlet is in an open state, the front end surface of the sealing plate blocks the rear end notch of the through groove.

[0017] The present invention has the following beneficial effects: By arranging exhaust channels on the left, middle and right sides of the mask body, and arranging an exhaust structure that can be connected to the three exhaust channels by movement to change the direction of the airflow in the mask body, the wearer can adjust the position of the exhaust structure according to the damp and hot feeling of the cheeks, discharge the damp and hot gas in the damp and hot area in a targeted manner, and use the airflow to blow away the sweat on the cheeks, thereby improving dryness and comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the dust mask with strong comfort of the present invention; Figure 2 The present invention Figure 1 A magnified image of point A; Figure 3 The present invention Figure 1 Another perspective of the picture; Figure 4 It is a disassembled schematic diagram of the dust mask with strong comfort of the present invention; Figure 5 The present invention Figure 4The enlarged view of point B; Figure 6 The present invention Figure 4 Enlarged view of point C; Figure 7 The present invention Figure 4 The enlarged view of point D; Figure 8 It is a schematic diagram of the exhaust structure and the rotating plate of the present invention; Fig. 9 Schematic diagram of the exhaust structure of the present invention.

[0020] In the figure: 1. cover body; 2. arc-shaped surface; 3. air intake cover; 4. air intake pipe; 5. air intake fan; 6. exhaust pipe; 7. exhaust fan; 8. exhaust hole; 9. rotating plate; 10. through hole; 11. limiting groove; 12. rotating ring; 13. first limiting protrusion; 14. arc-shaped channel; 15. arc-shaped slider; 16. first arc-shaped slide groove; 17. second limiting protrusion; 18. second arc-shaped slide groove; 19. air intake hole; 20. sealing plate; 21. side top plate; 22. force storage spring; 23. through groove. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0022] In the description of the present application, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] In addition, in the description of the present application, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0024] like Figures 1 to 9As shown, a typical embodiment of the present invention provides a dust mask with strong comfort, including a mask body 1, a front-arched curved surface 2 is provided on the surface of the mask body 1 corresponding to the part below the nostrils and above the chin of the wearer, and three exhaust channels distributed on the left, middle and right are provided on the curved surface 2, an exhaust structure that can be connected to one of the exhaust channels is slidably provided on the curved surface 2, and when the exhaust structure is connected to one of the exhaust channels, the other two exhaust channels are in a closed state, a row of air intake channels are provided at the rear ends of both sides of the mask body 1, and air intake structures for air intake through the air intake holes 19 are provided at the rear ends of both sides of the mask body 1.

[0025] In this embodiment, after being filtered by the air intake structure, the air enters the mask body 1 through the air intake channel for the wearer to breathe, and then is discharged through the exhaust channel and the exhaust structure. In this process, the flow direction of the gas in the mask body 1 is to enter from both sides of the wearer's cheeks and then be discharged from the exhaust channel on the curved surface 2.

[0026] When wearing the highly comfortable dust mask, the wearer can adjust the position of the exhaust mechanism according to the facial feeling of the temperature and humidity at various places in the mask body 1. The exhaust structure can respectively connect the three exhaust channels located on the left, middle and right to change the flow direction of the airflow in the mask body 1 and the area where the gas sweeps across the wearer's cheek, so as to achieve timely discharge of air in the mask body 1 where the temperature and humidity are too high and cause discomfort, and use the gas to sweep across different areas of the cheek to timely dry the sweat on the wearer's cheek to improve comfort.

[0027] Among them, the air intake structure includes an air intake pipe 4 and an air intake fan 5 installed at the bottom of the air intake pipe 4, and the exhaust structure includes an exhaust pipe 6 and an exhaust fan 7 installed at the bottom of the exhaust pipe 6. The air intake structure can increase the air intake volume, and the exhaust structure can increase the exhaust volume, thereby increasing the air circulation volume and flow rate in the mask body 1, improving the blowing effect, and using the air with a higher flow rate to timely guide the gas generated by the wearer's breathing to the exhaust channel connected to the exhaust structure, thereby improving air circulation. Specifically, a filter screen or filter assembly can be set in both the air intake pipe 4 and the exhaust pipe 6, which is the existing technology and will not be described in detail here.

[0028] On this basis, the exhaust channel includes a plurality of exhaust holes 8 distributed in a circular array and a rotating plate 9. The rotating plate 9 is circular, and the center of the rotating plate 9 is rotatably installed on the cover body 1. The surface of the rotating plate 9 is provided with through holes 10 adapted to the exhaust holes 8. The rotating plate 9 opens or closes the exhaust holes 8 by rotating.

[0029] In this embodiment, the through hole 10 is aligned with the exhaust hole 8 by rotating the rotating plate 9, so that the exhaust channel is in an open state. On the contrary, when the through hole 10 is misaligned with the exhaust hole 8, the exhaust channel is in a closed state.

[0030] Specifically, two limit grooves 11 are symmetrically distributed in the upper and lower directions on the outer side surface of the rotating plate 9, one end of the limit groove 11 is an open end, and the other end is a closed end, and the closed end is located on the diameter line of the rotating plate 9. A swivel ring 12 is provided at the rear end of the exhaust structure, and two first limit protrusions 13 corresponding to the limit grooves 11 are provided on the rear end surface of the swivel ring 12, wherein, when the open end is in a tilted upward state, the rotating plate 9 closes the exhaust channel, and when the open end is in a horizontal state and faces the exhaust structure, the first limit protrusion 13 can enter the limit groove 11 from the open end.

[0031] In this embodiment, when the exhaust structure is moved, after the first limiting protrusion 13 follows the rotating ring 12 to move laterally and enters the limiting groove 11 on one of the rotating plates 9, by rotating the rotating ring 12, the first limiting protrusion 13 uses the limiting groove 11 to drive the rotating plate 9 to rotate, thereby controlling the exhaust channel connected to the exhaust structure to be in an open or closed state.

[0032] The swivel 12 is fixedly connected to the front end of the exhaust pipe 6, and when the exhaust passage connected to the exhaust structure is in an open state, the exhaust fan 7 is located at the bottom of the exhaust pipe 6. In this way, the eccentricity of the exhaust fan 7 relative to the swivel 12 is utilized to better stabilize the exhaust pipe 6 and the swivel 12, and further, the exhaust passage can be better stabilized in the open state.

[0033] When the exhaust passage is in an open state, the open end of the limiting groove 11 is in an upwardly inclined state, so that the limiting groove 11 limits the exhaust structure by limiting the first limiting protrusion 13 .

[0034] Furthermore, an arcuate channel 14 is provided on the front side of the cover body 1 , and an arcuate slider 15 is rotatably sleeved on the rear end of the swivel 12 . The arcuate slider 15 slidably cooperates with the arcuate channel 14 , and the rear end surface of the arcuate slider 15 fits with the cover body 1 .

[0035] In this embodiment, the exhaust hole 8 is opened on the inner wall surface of the rear end of the arc channel 14, the front end of the arc channel 14 is open, the inner wall surfaces at the upper and lower ends of the arc channel 14 are respectively concave upward and downward, and the top and bottom ends of the arc slider 15 are respectively slidably mounted on the upper and lower ends of the opening of the arc channel 14.

[0036] The arc-shaped slider 15 fits with the rear end inner wall surface of the arc-shaped channel 14 so that the arc-shaped slider 15 can be limited. During the rotation of the rotating ring 12, the arc-shaped slider 15 remains stationary and seals the exhaust hole 8 around the rear end inner wall surface of the arc-shaped channel 14 to ensure air tightness.

[0037] Specifically, in this embodiment, the rear end inner wall surface of the arc-shaped channel 14 is provided with a circular center groove for accommodating the rotating plate 9, the exhaust hole 8 is provided in the circular center groove, the rear end inner wall surface of the circular center groove, the rear end surface of the rotating ring 12 and the rear end surface of the rotating plate 9 are all planes, and the front end surface of the rotating plate 9 is set to be an arc surface 2 adapted to the rear end inner wall surface of the arc-shaped channel 14. The arc-shaped slider 15 blocks the lateral gap between the front end surface of the rotating plate 9 and the rear end surface of the rotating ring 12.

[0038] On this basis, a first arcuate groove 16 for sliding of the first limiting protrusion 13 is arranged on the inner wall surface of the rear end of the arc channel 14, a second limiting protrusion 17 is arranged at the center of the rear end surface of the swivel ring 12 and on both sides of the front end surface of the arc slider 15, and a second arcuate groove 18 for sliding of the second limiting protrusion 17 is arranged at the center of the inner wall surface of the rear end of the arcuate groove and the center of the front side surface of the swivel ring 12. The second arcuate groove 18 is at the same height as the center of the rotating plate 9, and the width and depth of the limiting groove 11, the first arcuate groove 16 and the second arcuate groove 18 are the same.

[0039] In this embodiment, when the exhaust structure is displaced on the arc surface 2, the first limiting protrusion 13 is displaced in the first arc chute 16, and when the exhaust hole 8 is closed by the rotating plate 9, the open end of the limiting groove 11 is connected with the first arc chute 16 on its open side, so that the first limiting protrusion 13 can enter the limiting groove 11 from the first arc chute 16. Similarly, the first limiting protrusion 13 can enter the first arc through groove 23 from the limiting groove 11 to leave the limiting groove 11. When the exhaust hole 8 is in an open state, the limiting groove 11 and the first arc chute 16 are in a misaligned state. Among them, the first arc chute 16 can maintain the position of the first limiting protrusion 13 in the circumferential direction of the rotating ring 12 to ensure that the first limiting protrusion 13 can smoothly enter the limiting groove 11, so that the exhaust structure can be connected to the three exhaust channels located on the left, middle and right sides respectively.

[0040] When the exhaust structure is displaced in the arc channel 14, the second limiting protrusion 17 is displaced in the second arc groove 18, and the second arc groove 18 is used to limit the second limiting protrusion 17 in the circumferential direction of the rotating ring 12, thereby improving the locking effect of the arc slider 15 in the circumferential direction.

[0041] In addition, the second arc-shaped chute 18 on the front side of the rotating plate 9 is in a continuous state and is connected with the second arc-shaped chute 18 on the rear end inner wall surface of the arc-shaped channel 14. In the process that the first limiting protrusion 13 leaves the rotating plate 9, the second limiting protrusion 17 at the front end of the rotating ring 12 moves through the second arc-shaped chute 18 on the front side of the rotating ring 12 to the second arc-shaped chute 18 on the rear end surface of the arc-shaped channel 14, and the first lower protrusion enters the first arc-shaped chute 16 from the limiting groove 11. In this process, the first limiting protrusion 13 and the second limiting protrusion 17 can enter the first arc-shaped chute 16 and the second arc-shaped chute 18 on the rear end inner wall surface of the arc-shaped channel 14 respectively, so that the rotating plate 9 can be restored to the initial state, and the exhaust hole 8 is blocked by the rotating plate 9.

[0042] Among them, the air inlet channel includes an air inlet hole 19 and a sealing plate 20. The air inlet holes 19 are equidistantly arranged at the rear end of the side of the cover body 1 in the height direction. The air inlet holes 19 are in an inclined state with the air outlet end facing the curved surface 2. The sealing plate 20 is slidably installed inside the cover body 1. The sealing plate 20 blocks the air outlet end of the air inlet hole 19 by moving backward. When the exhaust structure is connected to the exhaust channel on the left or right side, the sealing plate 20 on the left or right side is pushed to block the air inlet hole 19 on the corresponding side.

[0043] The setting of the air inlet hole 19 in this embodiment allows the air entering through the air inlet hole 19 to move toward the curved surface 2 along the facial skin of the wearer, so as to better supply oxygen for the wearer to breathe and improve the exhaust effect of the air in the mask body 1.

[0044] The setting of the sealing plate 20 ensures that when the exhaust structure is connected to the exhaust channel located in the middle, the exhaust holes 8 on both sides of the mask body 1 are in an open state. At this time, air enters evenly on both sides of the wearer's cheeks, so that the air in the mask converges and flows from both sides to the middle of the curved surface 2 at the same time. Combined with the gas flow direction when the wearer exhales, the moisture generated by the breath can be discharged more quickly, thereby improving the dryness of the environment inside the mask body 1 and improving the wearing comfort.

[0045] When the exhaust structure is connected to the exhaust channel on the left side, the sealing plate 20 on the left side closes the air inlet 19 on the left side. At this time, the air enters the mask body 1 through the air inlet 19 on the right side. After the air passes through the right cheek of the wearer, it moves to the left side through the nostrils and the front of the mouth of the wearer, and finally is discharged from the exhaust channel on the left side. At this time, the air can dry the hot and humid environment on the right and middle parts of the mask body 1, and discharge the moisture in time. At the same time, the air entering the mask body 1 will effectively pass through the mouth and nose of the wearer to provide the wearer with enough oxygen and reduce the feeling of holding breath. In addition, by sweeping the right cheek with airflow, the right cheek can be directly blown dry, achieving the effect of sweating on the right cheek of the wearer. In addition, when the exhaust structure is connected to the exhaust channel on the right side, the effect achieved is the same as above.

[0046] On this basis, a side top plate 21 is provided on the air intake structure, and a force storage spring 22 is provided between the sealing plate 20 and the cover body 1. The force storage spring 22 is used to keep the sealing plate 20 separated from the air intake hole 19. When the air intake structure is connected to the exhaust channel located on the left or right side, the sealing plate 20 drives the sealing plate 20 located on the left or right side to move backward to block the air intake hole 19 on the corresponding side.

[0047] In this embodiment, the force storage spring 22 is located in the air inlet cavity, and the side top plate 21 moves synchronously with the exhaust structure. In particular, when the exhaust structure is connected to the exhaust channel on the left or right side, the left end or right end of the side top plate 21 will push the sealing plate 20 on the left or right side backwards, respectively, thereby blocking the air inlet 19 on the left or right side. In the initial state, the sealing plate 20 and the side top plate 21 are separated, and the elastic force of the force storage spring 22 makes the sealing plate 20 located at the frontmost position within its movement range, so that the air inlet 19 is open.

[0048] Furthermore, both ends of the arc-shaped channel 14 are provided with through grooves 23 for the end of the side top plate 21 to insert and squeeze the sealing plate 20. When the air inlet 19 is in an open state, the front end surface of the sealing plate 20 blocks the rear end notch of the through groove 23. Such a configuration enables the sealing plate 20 to block the through groove 23 in the initial state to ensure that the inner cavity of the cover body 1 is separated from the external environment. Of course, in this embodiment, in order to improve the separation effect between the inner cavity of the cover body 1 and the external environment, a sealing pad or a silicone pad or other structure can be set at the rear edge of the cover body 1, so that the rear end surface of the cover body 1 can better fit the wearer's face and improve the dustproof effect. In addition, in order to improve the sealing effect of the sealing plate 20 on the through groove 23, a sealing pad can also be set at the front end of the sealing plate 20, so that the sealing pad can better block the channel under the action of the storage spring 22. The above configuration methods for improving the air tightness of the cover body 1 are all prior arts and are not intended to limit this embodiment. Those skilled in the art can set the size and shape of the sealing pad according to actual conditions, which will not be repeated here.

[0049] The above implementation methods are only used to illustrate the embodiments of the present application, and are not limitations on the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present application. The scope of patent protection of the embodiments of the present application should be limited by the claims.

Claims

1. A dust mask with high comfort, comprising a mask body (1), characterized in that: The surface of the mask body (1) is provided with a front-arched curved surface (2) corresponding to the area below the nostrils and above the chin of the wearer, and three exhaust channels distributed on the left, middle and right sides are provided on the curved surface (2). An exhaust structure capable of being connected to one of the exhaust channels is slidably provided on the curved surface (2), and when the exhaust structure is connected to one of the exhaust channels, the other two exhaust channels are in a closed state. A row of air intake channels are provided at the rear ends of both sides of the mask body (1), and air intake structures for intake of air into the air intake holes (19) are provided at the rear ends of both sides of the mask body (1).

2. A comfortable dust mask according to claim 1, characterized in that: An air intake cover (3) is provided on both sides of the cover body (1); the air intake structure is connected to the surface of the air intake cover (3); an air intake cavity is formed between the air intake cover (3) and the cover body (1); and the air intake end of the air intake hole (19) is located in the air intake cavity.

3. A comfortable dust mask according to claim 1, characterized in that: The air intake structure comprises an air intake pipe (4) and an air intake fan (5) installed at the bottom of the air intake pipe (4), and the exhaust structure comprises an exhaust pipe (6) and an exhaust fan (7) installed at the bottom of the exhaust pipe (6).

4. A comfortable dust mask according to claim 1, characterized in that: The exhaust passage comprises a plurality of exhaust holes (8) distributed in a circular array and a rotating plate (9); the rotating plate (9) is circular, the center of the rotating plate (9) is rotatably mounted on the cover body (1), a through hole (10) adapted to the exhaust hole (8) is provided on the surface of the rotating plate (9), and the rotating plate (9) opens or closes the exhaust hole (8) by rotating.

5. A comfortable dust mask according to claim 4, characterized in that: The outer side surface of the rotating plate (9) is provided with two limit grooves (11) which are symmetrically distributed in an upper and lower direction. One end of the limit groove (11) is an open end and the other end is a closed end. The closed end is located on the diameter line of the rotating plate (9). A rotating ring (12) is provided at the rear end of the exhaust structure. Two first limit protrusions (13) corresponding to the limit grooves (11) are provided on the rear end surface of the rotating ring (12). When the open end is in an inclined upward state, the rotating plate (9) closes the exhaust channel. When the open end is in a horizontal state and faces the exhaust structure, the first limit protrusion (13) can enter the limit groove (11) from the open end.

6. A comfortable dust mask according to claim 5, characterized in that: The front side surface of the cover body (1) is provided with an arc-shaped channel (14), and the rear end rotating sleeve of the rotating ring (12) is provided with an arc-shaped slider (15), the arc-shaped slider (15) is slidably matched with the arc-shaped channel (14), and the rear end surface of the arc-shaped slider (15) is in contact with the cover body (1).

7. A comfortable dust mask according to claim 6, characterized in that: A first arcuate groove (16) for sliding the first limiting protrusion (13) is arranged on the inner wall surface at the rear end of the arcuate channel (14); a second limiting protrusion (17) is arranged at the center of the rear end surface of the rotating ring (12) and on both sides of the front end surface of the arcuate slider (15); a second arcuate groove (18) for sliding the second limiting protrusion (17) is arranged on the inner wall surface at the rear side of the arcuate groove; the second arcuate groove (18) is at the same height as the center of the rotating plate (9); and the limiting groove (11), the first arcuate groove (16) and the second arcuate groove (18) are all the same in width and depth.

8. A comfortable dust mask according to claim 6, characterized in that: The air inlet passage comprises an air inlet hole (19) and a sealing plate (20); the air inlet holes (19) are arranged at equal distances in the height direction at the rear end of the side surface of the cover body (1); the air inlet holes (19) are in an inclined state with the air outlet end facing the arc-shaped surface (2); the sealing plate (20) is slidably mounted inside the cover body (1); the sealing plate (20) blocks the air outlet end of the air inlet hole (19) by moving backward; and when the exhaust structure is connected to the exhaust passage on the left or right side, the sealing plate (20) on the left or right side is pushed to block the air inlet hole (19) on the corresponding side.

9. A comfortable dust mask according to claim 8, characterized in that: The air intake structure is provided with a side top plate (21), and a force storage spring (22) is provided between the sealing plate (20) and the cover body (1), and the force storage spring (22) is used to keep the sealing plate (20) in a state of being separated from the air intake hole (19). When the air intake structure is connected to the exhaust passage located on the left or right side, the sealing plate (20) drives the sealing plate (20) located on the left or right side to move backwards to block the air intake hole (19) on the corresponding side.

10. A comfortable dust mask according to claim 9, characterized in that: Both ends of the arc-shaped channel (14) are provided with through grooves (23) for the end of the side top plate (21) to be inserted into and squeeze the sealing plate (20); when the air inlet (19) is in an open state, the front end surface of the sealing plate (20) blocks the rear end notch of the through groove (23).

Images