Ventilation gas mask

Abstract

The invention relates to the technical field of ventilation gas masks and discloses a ventilation gas mask which comprises a mask body, a gas guide pipe, a gas adjusting valve and a first exhaust valve. The air adjusting valve is installed at the end of the air guide pipe. The first exhaust valve is arranged on the mask and used for exhausting air from the inside to the outside of the mask in a single direction; the mask comprises a head sleeve part, a neckerchief part and a surrounding edge part, the head sleeve part comprises an opening with a cavity, the opening is used for allowing the head of the human body to penetrate through, and the cavity is used for containing the head of the human body; the neckerchief part is installed on the inner wall of the head sleeve part and is close to the opening, an annular ventilation cavity is formed by the neckerchief part and the inner wall of the head sleeve part, and the ventilation cavity is used for tightly surrounding the neck of the human body so as to seal the space between the neck of the human body and the opening of the mask; the surrounding edge part is connected to the opening position of the head sleeve part; the neckerchief part is provided with a second exhaust valve, the second exhaust valve is used for discharging air from the interior of the ventilation cavity to the headgear part in a single direction, and the air guide pipe communicates with the interior of the ventilation cavity and is used for conveying air into the ventilation cavity.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation masks in polluted environment working scenes, and in particular to a ventilation mask. Background Art

[0002] Wearing a ventilation mask is an important means of protection in places where radioactive aerosol pollution or contamination may exist. The neck of the ventilation mask on the market is not airtight enough to ensure that the user breathes clean air.

[0003] Therefore, the present application designs a ventilation mask with a simple structure and capable of ensuring sealing performance at the user's neck. Summary of the invention

[0004] The present invention provides a ventilation mask, and the purpose is to design a ventilation mask that ensures sealing performance at the user's neck.

[0005] To achieve the above object, the present invention provides a ventilation mask, comprising:

[0006] A mask is used to cover the outside of the human head;

[0007] An air duct connected to the mask and used for conveying air to the inside of the mask;

[0008] An air regulating valve is installed at the end of the air guide pipe;

[0009] A first exhaust valve, provided on the mask, for exhausting air from the inside of the mask to the outside in one direction;

[0010] The mask comprises a head cover portion, a neck portion and a rim portion, the head cover portion comprises an opening with a cavity, the opening is used for the human head to pass through, and the cavity is used to accommodate the human head; the neck portion is installed on the inner wall of the head cover portion and is arranged close to the opening, the neck portion and the inner wall of the head cover portion form an annular ventilation cavity, the ventilation cavity is used to be tightly arranged outside the human neck to seal the human neck and the opening of the mask; the rim portion is connected to the opening position of the head cover portion; a second exhaust valve is arranged on the neck portion, the second exhaust valve is used to exhaust air from the inside of the ventilation cavity to the head cover portion in a single direction, and the air duct is connected to the ventilation cavity for conveying air into the ventilation cavity.

[0011] In one embodiment, the ventilation mask further comprises a connecting piece, which is disposed on the mask and is used to connect the airway tube and the ventilation cavity.

[0012] In one embodiment, the connecting piece is a three-way connection, and the connecting piece includes an air inlet, a first air outlet, and a second air outlet, and the first air outlet is connected to the ventilation cavity; the ventilation mask also includes an alarm and a connecting pipe, one end of the connecting pipe is connected to the second air outlet, and the other end is connected to the alarm, and the alarm is installed in the head cover.

[0013] In one embodiment, the number of the second exhaust valves is two.

[0014] In one embodiment, the ventilation mask further comprises a waist belt, and the air regulating valve is mounted on the waist belt.

[0015] In one embodiment, the head cover portion includes a window strip, and the window strip extends from a front surface of the head cover portion to surfaces on both sides to increase a user's viewing angle.

[0016] In one embodiment, a plurality of Velcro strips are further provided on the surrounding edge portion.

[0017] In one embodiment, the air regulating valve includes a valve body and a quick male connector, the valve body has an air outlet pipe, the air outlet pipe is connected to the air guide pipe, and the quick male connector is used to connect to an external quick female connector.

[0018] In one embodiment, the mask further comprises a tear strip portion, and the tear strip portion is integrally arranged on the head cover portion.

[0019] In one embodiment, the surrounding edge portion further has an instrument window.

[0020] The ventilation air mask of the technical solution of the present invention forms a ventilation cavity inside the mask by providing a neck portion. The ventilation cavity can swell under the action of high-pressure gas, so that the opening position of the mask can fit the neck of the human body to ensure the airtightness at the neck, avoid external polluted air from entering the mask through the neck, and ensure that the operator breathes clean air. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention 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 of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 A schematic structural diagram of an embodiment of a ventilation mask provided by the present invention;

[0023] Figure 2A partial structural schematic diagram of an embodiment of a ventilation mask provided by the present invention;

[0024] Figure 3 A schematic cross-sectional structure diagram of an embodiment of a ventilation mask provided by the present invention;

[0025] Figure 4 A schematic structural diagram of a connecting pipe of an embodiment of a ventilation mask provided by the present invention;

[0026] Figure 5 A schematic diagram of the exploded structure of the connecting pipe of an embodiment of the ventilation mask provided by the present invention;

[0027] Figure 6 A schematic cross-sectional structure diagram of a connecting pipe of an embodiment of a ventilation mask provided by the present invention;

[0028] Figure 7 A schematic diagram of the structure of an air regulating valve of an embodiment of a ventilation mask provided by the present invention;

[0029] Figure 8 A schematic structural diagram of an alarm device of an embodiment of a ventilation mask provided by the present invention;

[0030] Fig. 9 A schematic cross-sectional structure diagram of an alarm device of an embodiment of a ventilation mask provided by the present invention;

[0031] Fig.10 A schematic diagram of the explosion structure of an alarm of an embodiment of a ventilation mask provided by the present invention.

[0032] Description of Figure Numbers:

[0033] 10. Mask; 11. Headgear; 111. Cavity; 112. Opening; 113. Window strip; 12. Neck; 13. Edge; 14. Ventilation cavity; 15. Velcro; 16. Tear strip; 17. Instrument window; 20. Air duct; 30. Air regulating valve; 31. Valve body; 32. Quick male connector; 40. First exhaust valve; 50. Second exhaust valve; 60. Connecting piece; 61a. First air inlet; 61b. First air outlet; 61c. Second air outlet; 61. First injection molded part; 611. Support pipe; 6111. Second air inlet channel; 612. Air inlet pipe; 6121. First air inlet channel; 6122. Conical convex wall Ring; 62, second injection molded part; 621, positioning ring part; 622, connecting pipe part; 6221, first air outlet channel; 623, air outlet pipe part; 6231, second air outlet channel; 624, welding ring part; 625, reinforcement part; 70, alarm; 71, shell; 71a, second air inlet; 711, lower tube; 7111, first cylindrical cavity; 712, upper tube; 712a, vent; 7121, second cylindrical cavity; 7121a, third cylindrical cavity; 7121b, fourth cylindrical cavity; 72, warning part; 721, main body; 722, sealing ring part; 723, connecting part; 73, elastic part; 80, connecting pipe; 90, belt. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] Please refer to Figure 1-Figure 10 As shown, an embodiment of the present application provides a ventilation air mask, which includes a mask 10, an air duct 20, an air regulating valve 30, a first exhaust valve 40, and a second exhaust valve 50. The mask 10 is used to cover the outside of the human head to isolate the human head from the external environment, thereby avoiding breathing polluted air from the outside, so as to ensure that the user can work in a polluted environment. The air duct 20 is connected to the inside of the mask 10, and is used to transport air for the operator to breathe to the inside of the mask 10. The air regulating valve 30 is installed at the end of the air duct 20, and is used to control the amount of air intake. The first exhaust valve 40 is set on the mask 10, and is used for unidirectional air outlet. The air inside the mask 10 can be discharged to the outside through the first exhaust valve 40, but the outside air cannot enter the inside of the mask 10 through the first exhaust valve 40.

[0038] The mask 10 includes a head cover 11, a neck cover 12 and a rim 13. The head cover 11 includes an opening 112 with a cavity 111. The opening 112 is used for the human head to pass through. The cavity 111 is used to accommodate the human head. When in use, the human head passes through the opening 112 and then enters the cavity 111. The neck cover 12 is installed on the inner wall of the head cover 11 and is arranged close to the opening 112. The neck cover and the inner wall of the head cover 11 form an annular ventilation cavity 14. The ventilation cavity 14 is used to be tightly surrounded outside the human neck to seal the human neck and the opening 112 of the mask 10, so as to prevent external polluted air from entering the mask 10 from the neck, thereby polluting the air inside the mask 10. The rim 13 is connected to the opening 112 of the head cover 11. The rim 13 is used to be placed on the shoulders of the human body to ensure that the head cover 11 can be stably placed. The neck girdle 12 is provided with a second exhaust valve 50, which is used to exhaust air from the inside of the ventilation cavity 14 to the head cover 11 in one direction. The air guide tube 20 is connected to the ventilation cavity 14 and is used to transport air into the ventilation cavity 14. The present application forms a ventilation cavity 14 at a position corresponding to the neck of the human body by providing the neck girdle 12. External high-pressure gas can enter the ventilation cavity 14 through the air guide tube 20, so that the ventilation cavity 14 swells and fills the position of the user's neck, so that the opening 112 of the head cover 11 fits the neck of the human body, so that the mask 10 can isolate the space above the neck to prevent the polluted air from the outside from entering the head cover through the gap of the neck, so as to ensure that the operator can breathe clean air, thereby ensuring the health of the operator.

[0039] When using the ventilation hood of the present application, the high-pressure gas in the outside world enters into the air duct 20 through the air regulating valve 30, and then enters into the ventilation cavity 14 through the air duct 20. The ventilation cavity 14 is connected to the head cover part through the second exhaust valve 50. The second exhaust valve 50 is a one-way valve, and the air can only be transported from the ventilation cavity 14 to the head cover part for the human body in the head cover part to breathe. The air in the head cover part can then be transported to the outside world through the first exhaust valve 40. The ventilation hood of the present application is in a state of dynamic balance when in use, to ensure that sufficient air is provided for the user to breathe. It should be noted that the high-pressure gas in the outside world of the present application is air with a pressure of 6KG.

[0040] In an optional embodiment, the number of the second exhaust valves 50 is set to two, and the two second exhaust valves 50 are arranged at intervals to ensure that the interior of the ventilation cavity 14 can bulge, thereby ensuring that the neck girdle portion 12 can fit tightly against the human neck, thereby ensuring isolation between the head cover portion 11 and the outside world.

[0041] The ventilation mask also includes a connecting piece 60, which is arranged on the mask 10 and is used to connect the airway tube 20 and the ventilation cavity 14. Specifically, the connecting piece 60 is arranged on the mask 10, and the connecting piece 60 can be welded to the mask 10 by welding, and the welding method is high-frequency welding. The connecting piece 60 is used as a connecting component to connect the airway tube 20 and the ventilation cavity 14 to ensure that the airway tube 20 can maintain its shape at the position connected to the mask 10, so as to avoid the airway tube 20 from being entangled, thereby affecting the normal breathing of the operator.

[0042] In an optional embodiment, the connecting piece 60 is a three-way connecting pipe, which includes a first air inlet 61a, a first air outlet 61b and a second air outlet 61c, and the first air outlet 61b is connected to the ventilation cavity 14. The ventilation mask also includes an alarm 70 and a connecting pipe 80, one end of the connecting pipe 80 is connected to the second air outlet 61c, and the other end is connected to the alarm 70, and the alarm 70 is installed in the head cover part 11.

[0043] Specifically, the ventilation mask of this embodiment also includes an alarm 70 and a connecting pipe 80. The alarm 70 is used to monitor whether the pressure of the gas delivered from the outside is normal. For example, when the delivered air pressure is lower than 60KG, it will turn red to prompt the operator to stay away immediately. The connecting piece 60 is a three-way connecting pipe, which includes a first air inlet 61a, a first air outlet 61b and a second air outlet 61c. The first air outlet 61b is connected to the ventilation cavity 14 to provide air that can be breathed by the human body inside the ventilation cavity 14. The air enters the ventilation cavity 14 from the first air outlet 61b and then enters the head cover 11 through the second exhaust valve 50. One end of the connecting pipe 80 is connected to the second air outlet 61c, and the other end is connected to the alarm 70. The alarm 70 is installed in the head cover 11 for the operator to directly watch and then prompt the operator. It should be noted that the alarm 70 is an IDB alarm 70.

[0044] In an optional embodiment, the connecting piece 60 includes a first injection molded part 61 and a second injection molded part 62, one end of the first injection molded part 61 is connected to the second injection molded part 62, and the specific connection method is one-piece injection molding. The injection molding method is two-color injection molding, the hardness of the first injection molded part 61 is greater than the hardness of the second injection molded part 62, and the second injection molded part 62 is used for high-frequency welding on the mask 10 of the ventilation mask. The texture of the second injection molded part 62 is relatively soft, so it can be conveniently connected to the mask 10 in an integrated manner by high-frequency welding, thereby fixing the position of the three-way connecting pipe. The texture of the first injection molded part 61 is relatively hard, so the first injection molded part 61 is not easy to deform, and it plays a supporting role, which can prevent the three-way connecting pipe from being squeezed by external pressure, thereby deforming and affecting the normal breathing of the operator. The second injection molded part 62 protrudes a positioning ring part 621 to one side of the first injection molded part 61, and the first injection molded part 61 is sleeved outside the positioning ring part 621. It should be noted that the two-color injection molding process combines two different plastic materials through two injection processes to form a plastic product with two colors or two different material properties. The present application uses two plastics of different hardness for injection molding, so that the first injection molded part 61 and the second injection molded part 62 are closely connected together, and the second injection molded part 62 is relatively soft, which is conducive to being connected to the mask 10 of the ventilation mask by high-frequency welding.

[0045] In an optional embodiment, the first injection molded part 61 includes an air inlet pipe part 612 and a support pipe part 611 connected to each other. A first air inlet channel 6121 and a second air inlet channel 6111 are formed in the air inlet pipe part 612 and the support pipe part 611, respectively. The end of the support pipe part 611 is sleeved outside the positioning ring part 621, and the end of the air inlet pipe part 612 has a first air inlet port 61a. The second injection molded part 62 includes a connecting pipe part 622 and an air outlet pipe part 623. The positioning ring part 621 is arranged at one end of the connecting pipe part 622 facing the support pipe part 611. The air outlet pipe part 623 is connected to the circumferential surface of the connecting pipe part 622, and the air outlet pipe part 623 has a second air outlet channel 6231. The connecting pipe part 622 has a first air outlet channel 6221. The end of the connecting pipe part 622 axially away from the support pipe has a first air outlet port 61b, and the end of the air outlet pipe part 623 has a second air outlet port 61c.

[0046] Specifically, in this embodiment, the first injection molded part 61 includes an air inlet pipe part 612 and a support pipe part 611, and the diameter of the air inlet pipe part 612 is smaller than the diameter of the support pipe part 611. A first air inlet channel 6121 is formed in the air inlet pipe part 612, and a second air inlet channel 6111 is formed in the support pipe part 611. The first air inlet channel 6121 and the second air inlet channel 6111 are connected to each other. The end of the support pipe part 611 is sleeved outside the positioning ring part 621, and the end of the air inlet pipe part 612 has a first air inlet port 61a. The air guide pipe 20 of the ventilation mask is installed outside the air inlet pipe part 612 to transport air to the first air inlet channel 6121 and the second air inlet channel 6111 through the first air inlet port 61a.

[0047] The second injection molded part 62 includes a connecting pipe and an air outlet pipe. The positioning ring portion 621 is arranged on the connecting pipe portion 622 and extends from the end surface of the connecting pipe portion 622 to the first injection molded part 61. The air outlet pipe is integrally connected to the circumferential surface of the connecting pipe, and a second air outlet channel 6231 is formed inside the air outlet pipe, and a first air outlet channel 6221 is formed inside the connecting pipe portion 622. The end of the connecting pipe portion 622 axially away from the support pipe has a first air outlet 61b, and the end of the air outlet pipe portion 623 has a second air outlet 61c. The air outlet pipe portion 623 is used to be connected to an alarm 70 through a connecting pipe. The alarm 70 is arranged in the mask 10 of the ventilation mask for direct observation by the operator to confirm whether the air pressure delivered from the outside is sufficient. Figure 5 and Figure 6 As shown, one end of the air guide tube 20 is connected to the first air inlet 61a on the first injection molded part 61, and then the air passes through the three-way connecting pipe to send the air into the mask 10 through the first air outlet 61b, and to the alarm 70 through the second air outlet 61c. The alarm 70 is used to monitor whether the pressure of the air sent is sufficient. If the pressure is insufficient, it will display red to remind the operator to immediately leave the position.

[0048] In an optional embodiment, the second injection molded part 62 further includes a welding ring portion 624, and the welding ring portion 624 is connected to one end of the connecting tube portion 622 away from the first injection molded part 61. In this embodiment, the end of the connecting tube portion 622 of the second injection molded part 62 away from the first injection molded part 61 is also provided with a welding ring portion 624, and the welding ring portion 624 is welded to the mask 10 of the ventilation mask.

[0049] In an optional embodiment, the thickness of the welding ring portion 624 is less than the thickness of the connecting tube portion 622. In order to increase the adaptability of the welding ring portion 624 to the mask 10, the present application sets the thickness of the welding ring portion 624 to be less than the thickness of the connecting tube portion 622. The thickness of the welding ring portion 624 is slightly greater than the thickness of the mask 10.

[0050] In an optional embodiment, a reinforcement portion 625 is filled between the air outlet pipe portion 623 and the welding ring portion 624. The air outlet pipe portion 623 is used to connect the connecting pipe 80. The connecting pipe 80 is sleeved on the air outlet pipe portion 623, and the connecting pipe 80 is integrally welded to the air outlet pipe portion 623 by high-frequency welding. Since the air outlet pipe portion 623 needs to be connected to the connecting pipe 80, the strength at the position of the air outlet pipe needs to be appropriately improved to reduce the probability of the connecting pipe 80 bending at the position of the air outlet pipe portion 623, so as to ensure that the air can smoothly enter the connecting pipe 80 through the air outlet pipe portion 623 and flow into the position of the alarm 70.

[0051] In an optional embodiment, the surface of the welding ring portion 624 facing the first injection molded part 61 has a plurality of grooves. The surface of the welding ring portion 624 facing the first injection molded part 61 is a welding surface, and a plurality of grooves are provided on this surface, which can increase the contact area between the welding ring portion 624 and the mask 10, thereby increasing the firmness of the welding.

[0052] In an optional embodiment, the end of the support tube 611 away from the second injection molded part 62 is rounded. The support tube 611 is used to support and maintain its shape. By rounding the end of the support tube 611 away from the second injection molded part 62, stress concentration can be reduced, thereby further reducing the probability of deformation of the support tube 611, thereby ensuring that the operator can breathe enough air.

[0053] In an optional embodiment, the circumferential wall of the air intake pipe portion 612 has at least two conical convex wall rings 6122. The air intake pipe portion 612 is used to connect the air duct 20. When installing, the air duct 20 is directly sleeved on the circumferential wall of the air intake pipe portion 612, so that the air duct 20 and the air intake pipe portion 612 can be connected. The present application provides at least two conical convex wall rings 6122 on the circumferential wall of the air intake pipe portion 612 to increase the tightness of the sleeve connection between the air duct 20 and the air intake pipe portion 612.

[0054] In an optional embodiment, the alarm 70 includes a housing 71, a warning member 72 and an elastic member 73. The housing 71 has a housing cavity inside, and the lower end of the housing 71 has a second air inlet 71a for air intake. The warning member 72 is movably arranged in the housing cavity. The elastic member 73 is arranged in the housing cavity, and one end of the elastic member 73 abuts against the warning member 72, and the other end abuts against an end of the housing 71 away from the second air inlet 71a. The lower end of the housing 71 has a transparent area, and the warning member 72 is used to move in the housing cavity under the action of the intake pressure, so as to move into the transparent area or move out of the transparent area for the user to view.

[0055] Specifically, the alarm 70 of the present application is arranged inside the mask of the ventilation mask for the user to observe in the contaminated place. The interior of the shell 71 has a receiving cavity for receiving the warning member 72, and the warning member 72 is arranged in the receiving cavity, and one end of the elastic member 73 abuts against the warning member 72, and the other end abuts against the bottom wall of the upper end of the receiving cavity. The lower end of the shell 71 has a second air inlet 71a, and the second air inlet 71a is connected to the receiving cavity so that the external gas can enter the receiving cavity and contact with the warning member 72 to drive the warning member 72 to move in the receiving cavity.

[0056] When in use, the external air pipe is connected to the second air inlet 71a at the lower end of the shell 71 through a connecting pipe to deliver air for the user to breathe to the alarm 70. Under the action of gas pressure, the warning member 72 compresses the elastic member 73 so that the warning member 72 moves outside the transparent area. At this time, the user observes the position of the transparent member and cannot observe the warning member 72, indicating that the pressure of the gas delivered from the outside is sufficient, indicating that enough air can be provided for the operator to breathe. At this time, the operator has enough air to breathe. Or the gas delivered from the outside is insufficient. At this time, the elasticity of the elastic member 73 is greater than the gas pressure. Therefore, the elastic member 73 will push the warning member 72 to the transparent area. The user can directly observe the warning member 72 through the transparent area. At this time, the operator needs to leave the polluted environment immediately to prevent the operator from being in danger due to insufficient gas supply.

[0057] It should be noted that the warning member 72 has a bright color to distinguish it from the transparent member, and the operator can confirm at a glance whether the gas supply is sufficient. In some optional embodiments, the warning member 72 is red to facilitate the operator.

[0058] In an optional embodiment, the housing 71 includes a lower cylinder 711 and an upper cylinder 712, which are assembled to form a receiving chamber. The inner wall of the upper cylinder 712 has an internal thread, a portion of the lower cylinder 711 extends into the upper cylinder 712, and the portion extending into the upper cylinder 712 has an external thread that matches the internal thread.

[0059] Specifically, housing 71 is assembled by lower tube 711 and upper tube 712, and upper tube 712 is sleeved on a part of the upper end of lower tube 711 so that other positions of lower tube 711 are exposed to the outside. Upper tube 712 and lower tube 711 are through internal thread and external thread, to fix. Upper tube 712 is an opaque piece, and transparent area is arranged on lower tube 711. When upper tube 712 and lower tube 711 are assembled into one, a part of lower tube 711 is positioned at upper tube 712 outside, so that transparent area on lower tube 711 can be exposed to the outside world, for the operator to check. In an optional embodiment, lower tube 711 is a transparent piece made of transparent material, and lower tube 711 is integrally set to transparent piece, can reduce the structure of transparent area being separately set, to further simplify the structure of lower tube 711. In use, lower tube 711 is not inserted into the part in upper tube 712 and can be directly observed by the operator.

[0060] The lower tube 711 has a first cylindrical cavity 7111 inside, and the warning member 72 is arranged in the first cylindrical cavity 7111. The upper tube 712 has a second cylindrical cavity 7121 inside. The second cylindrical cavity 7121 is a stepped cavity. The second cylindrical cavity 7121 includes a third cylindrical cavity 7121a and a fourth cylindrical cavity 7121b. The diameter of the third cylindrical cavity 7121a is larger than that of the fourth cylindrical cavity 7121b, and the inner diameter of the third cylindrical cavity 7121a is matched with the outer diameter of the upper tube 712. The upper end of the lower tube 711 extends into the third cylindrical cavity 7121a. One end of the elastic member 73 abuts against the warning member 72, and the other end abuts against the bottom wall of the fourth cylindrical cavity 7121b, so as to apply downward elastic force to the warning member 72. The gas entering from the second air inlet 71a at the lower end of the lower tube 711 applies upward pressure to the warning member 72. When the pressure is sufficient, the pressure of the gas is greater than the elastic force of the warning member 72 and the gravity of the warning member 72, so that the warning member 72 moves toward the upper end to move into the upper tube 712. Since the upper tube 712 is an opaque member, the operator can only see the transparent lower tube 711. When the gas pressure is insufficient, the elastic force of the elastic member 73 is greater than the gas pressure, so that the warning member 72 moves to the side of the lower tube 711 to be exposed in the lower tube 711, so as to remind the operator that the gas pressure is insufficient.

[0061] The second air inlet 71a is provided at one end of the lower tube 711 away from the upper tube 712, that is, the second air inlet 71a is provided at the lower end of the lower tube 711, and the upper tube 712 is provided with an air vent 712a at one end away from the lower tube 711, that is, the upper end of the upper tube 712 is provided with the air vent 712a, and the air vent 712a is used to connect the accommodating cavity with the outside world so that the warning member 72 can move in the accommodating cavity.

[0062] In an optional embodiment, the warning member 72 includes an integrally formed main body 721, a sealing ring 722 and a connecting portion 723. The main body 721 extends along the axial direction of the lower cylinder 711, and the sealing ring 722 is arranged on the circumference of the main body 721 and is closely abutted against the first cylindrical cavity 7111. The connecting portion 723 is arranged at one end of the main body 721 close to the elastic member 73, and is used to connect the elastic member 73.

[0063] Specifically, the warning member 72 includes a main body 721, a sealing ring 722 and a connecting portion 723. The length direction of the main body 721 is the axial direction of the lower tube 711. The sealing ring 722 is arranged outside the main body 721 and arranged in the circumferential direction of the main body 721 to closely abut against the first cylindrical cavity 7111 in the lower tube 711 to ensure the sealing performance between the warning member 72 and the inner wall of the first cylindrical cavity 7111. The connecting portion 723 is arranged at the upper end of the main body 721 to connect the elastic member 73.

[0064] In an optional embodiment, the number of the sealing ring parts 722 is set to at least two. The elastic member 73 is a spring, one end of the spring abuts against the bottom wall of the upper cylinder 712 , and the other end is sleeved on the connecting part 723 .

[0065] Specifically, in this embodiment, the number of the sealing ring parts 722 is set to three, and the three sealing ring parts 722 are arranged at intervals at both ends and the middle of the main body part 721. Due to the manufacturing tolerance, multiple sealing ring parts 722 are provided to compensate for the manufacturing tolerance to ensure the sealing performance between the sealing ring part 722 and the inner wall of the first cylindrical cavity 7111. The elastic member 73 is a spring, which is arranged in the upper cylinder 712, and the lower end of the spring is sleeved on the connecting part 723, and the other end of the spring abuts against the bottom wall of the fourth cylindrical cavity 7121b of the upper cylinder 712.

[0066] In an optional embodiment, the ventilation mask further includes a waist belt 90, and the air regulating valve 30 is installed on the waist belt 90. When the operator uses the ventilation mask of the present application, the air duct 20 needs to be fixed, so the present application is provided on the waist belt 90, and the air regulating valve 30 is fixed on the waist belt 90 to fix the air regulating valve 30, so as to facilitate the movement of the operator and normal operation.

[0067] In an optional embodiment, the head cover portion 11 includes a window strip 113, and the window strip 113 extends from the front surface of the head cover portion 11 to the two side surfaces to increase the viewing angle of the user.

[0068] Specifically, the head cover 11 is a square tube structure, which includes a front surface, a rear surface, a left surface and a right surface. The front surface is the side facing the user's face, and the user can observe the external environment through the window strip 113 on the front surface. The windows on the market are currently only set on the front surface. At this time, the operator's visual angle is small, which is inconvenient for the operator to work. The window strip 113 of the present application extends from the front surface of the head cover 11 to the left side and the right side to form a U-shaped window strip 113. The window strip 113 includes a front window and side windows on both sides. The operator can observe the outside world through the front window and the side windows, which greatly improves the user's visual angle and facilitates the operator to work in a polluted environment. It should be noted that the window strip 113 is made of PVC material, and the hardness of the window strip 113 is higher than the hardness at other positions. Since the window strip 113 is for the user's line of sight to pass through, the material requirements of the window strip 113 are much higher than the materials at other positions.

[0069] In an optional embodiment, the edge portion 13 is also provided with a plurality of Velcro 15 and an instrument window 17. The edge portion 13 is used to fix two ventilation masks. The present application is provided with Velcro 15 at each corner of the edge portion 13 to fit the Velcro 15 on the user's clothes, thereby fixing the ventilation mask of the present application to ensure that the user can breathe normally. The instrument window 17 is used for the operator to observe the relevant instruments.

[0070] In an optional embodiment, the air regulating valve 30 includes a valve body 31 and a quick male connector 32. The valve body 31 has an air outlet pipe connected to the air guide pipe 20. The quick male connector 32 is used to connect to an external quick female connector. The present application uses the quick male connector 32 to match the external quick female connector, so that quick plugging and unplugging can be achieved for user convenience.

[0071] In an optional embodiment, the mask 10 further includes a tearing strip 16, which is integrally provided on the head cover 11. The tearing strip 16 is used by the user in an emergency so that the user can tear it apart to allow the human body to breathe. For example, if there is no air supply outside, the user needs to breathe even in a harsh environment. At this time, the user can tear off the tearing strip 16 to tear open the head cover 11 so that the user can breathe.

[0072] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A ventilation mask, characterized in that: include: A mask is used to cover the outside of the human head; An air duct connected to the mask and used for conveying air to the inside of the mask; An air regulating valve is installed at the end of the air guide pipe; A first exhaust valve, provided on the mask, for exhausting air from the inside of the mask to the outside in one direction; The mask comprises a head cover portion, a neck portion and a rim portion, the head cover portion comprises an opening with a cavity, the opening is used for the human head to pass through, and the cavity is used to accommodate the human head; the neck portion is installed on the inner wall of the head cover portion and is arranged close to the opening, the neck portion and the inner wall of the head cover portion form an annular ventilation cavity, the ventilation cavity is used to be tightly arranged outside the human neck to seal the human neck and the opening of the mask; the rim portion is connected to the opening position of the head cover portion; a second exhaust valve is arranged on the neck portion, the second exhaust valve is used to exhaust air from the inside of the ventilation cavity to the head cover portion in a single direction, and the air duct is connected to the ventilation cavity for conveying air into the ventilation cavity.

2. The ventilation mask according to claim 1, characterized in that The ventilation mask also includes a connecting piece, which is arranged on the mask and is used to connect the airway tube and the ventilation cavity.

3. The ventilation mask according to claim 1, characterized in that The connecting piece is a three-way connection, and the connecting piece includes an air inlet, a first air outlet and a second air outlet, and the first air outlet is connected to the ventilation cavity; the ventilation mask also includes an alarm and a connecting pipe, one end of the connecting pipe is connected to the second air outlet, and the other end is connected to the alarm, and the alarm is installed in the head cover.

4. The ventilation mask according to claim 1, characterized in that The number of the second exhaust valves is two.

5. The ventilation mask according to claim 1, characterized in that: The ventilation mask also includes a waist belt, and the air regulating valve is installed on the waist belt.

6. The ventilation mask according to claim 1, characterized in that The head cover portion comprises a window strip, and the window strip extends from a front surface of the head cover portion to surfaces on both sides so as to increase a user's viewing angle.

7. The ventilation mask according to claim 1, characterized in that: The surrounding edge portion is also provided with a plurality of Velcro strips.

8. The ventilation mask according to claim 1, characterized in that The air regulating valve comprises a valve body and a quick male connector. The valve body has an air outlet pipe, the air outlet pipe is connected to the air guide pipe, and the quick male connector is used to connect to an external quick female connector.

9. The ventilation mask according to claim 1, characterized in that The mask further comprises a tear strip portion, which is integrally arranged on the head cover portion.

10. The ventilation mask according to claim 1, characterized in that The surrounding edge portion is also provided with an instrument window.

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