Backflow prevention structure of fire escape mask breathing valve

Abstract

The utility model relates to escape mask technical field discloses fire escape mask breathing valve backflow prevention structure, including the mask, the front side middle part of mask is clamped with filter drum, the inside rear side fixedly connected with baffle three of mask, the outside all around of baffle three is equipped with a plurality of mesh slots, the outside slide connection of mesh slot has the piston, the inside middle part fixedly connected with check valve of mask, the top of mask is provided with the roof, the roof bottom fixedly connected with filter screen, the inside of mask is provided with adjusting mechanism, adjusting mechanism is used for adjusting the airflow flow. In the utility model, the mask is worn on the face during use to realize air circulation, the airflow is filtered through the filter drum during the inhalation stage, enters the mask through the check valve for oxygen supply, the check valve intercepts the airflow and pushes the piston to move upward during the exhalation, the piston blocks the top hole according to the breathing strength, the exhaled gas is filtered through the filter screen and discharged, and the air in the mask is dynamically maintained fresh.

Description

Technical Field

[0001] This utility model relates to the field of escape mask technology, and in particular to the anti-backflow structure of the breathing valve of a fire escape mask. Background Technology

[0002] Fire escape masks are personal protective equipment that protects the respiratory system in emergency situations such as fires. They consist of a flame-retardant and heat-insulating mask body, a high-efficiency filter canister, and a fixed head strap. They can filter toxic gases, provide heat insulation and radiation protection, and offer clear vision and comfortable wear, helping people escape safely in smoke. To improve the mask's breathing smoothness and filtration effect, a backflow prevention structure for the breathing valve of a fire escape mask is required.

[0003] The backflow prevention structure of the breathing valve of a fire escape mask refers to the structure in the breathing valve that enables unidirectional gas flow through a specific mechanical structure. When inhaling, the valve opens to allow air in, and when exhaling, it closes to allow air in and exhausts gas, preventing exhaled gas from flowing back into the mask, ensuring clean inhaled air and avoiding the risk of secondary inhalation of toxic gases.

[0004] Currently available fire escape masks employ a backflow prevention structure for their breathing valves, consisting of a valve core, valve seat, and spring. To enhance the backflow prevention effect and improve the one-way gas flow, existing technologies optimize spring stiffness and preload to increase the valve core's reset speed, allowing for rapid blocking of external reverse airflow after exhalation. However, this mechanical spring adjustment method is ill-suited for extreme high-temperature environments. High temperatures can cause the spring to anneal and fail, reducing its backflow prevention performance. Furthermore, it cannot flexibly adapt to airflow variations caused by differences in breathing frequencies among different users, thus reducing the device's practicality. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a backflow prevention structure for the breathing valve of a fire escape mask, aiming to improve the problem that the backflow prevention structure of the breathing valve in the prior art is difficult to adjust according to the breathing frequency.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a backflow prevention structure for the breathing valve of a fire escape mask, including a mask, a filter cartridge engaged in the center of the front side of the mask, a baffle three fixedly connected to the rear side of the inside of the mask, multiple mesh grooves opened around the outer perimeter of the baffle three, a piston slidably connected to the outer side of the mesh grooves, a one-way valve fixedly connected to the center of the inner side of the mask, a top plate provided on the top of the mask, a filter screen fixedly connected to the bottom of the top plate, and an adjustment mechanism provided on the inner side of the mask for adjusting the airflow.

[0007] As a further description of the above technical solution:

[0008] The adjustment mechanism includes a rotating rod, which is rotatably connected to the bottom inner side of the mask. A second bevel gear is fixedly connected to the top of the rotating rod. A first bevel gear is rotatably connected to the front inner side of the mask. A first baffle is fixedly connected to the inner side of the first bevel gear. A second baffle is fixedly connected to the middle inner side of the mask. The first bevel gear and the second bevel gear are meshed together.

[0009] As a further description of the above technical solution:

[0010] A positioning block is fixedly connected to the middle of the bottom end of the mask, and a positioning hole is opened on the inner side of the positioning block.

[0011] As a further description of the above technical solution:

[0012] A knob is rotatably connected to the front bottom of the mask, and the top of the knob passes through the mask and is fixedly connected to the rotating rod.

[0013] As a further description of the above technical solution:

[0014] The bottom of the top plate is fixedly connected with inserts around its four sides, and the top of the mask is provided with slots around its four sides, with the inserts engaging with the slots.

[0015] As a further description of the above technical solution:

[0016] The mask has sliding grooves on both the left and right sides inside, and the sliding grooves are slidably connected to the piston.

[0017] As a further description of the above technical solution:

[0018] Sealing plates are fixedly connected to the left and right rear sides of the mask, and the outer side of the sealing plate is fixedly connected to the baffle.

[0019] As a further description of the above technical solution:

[0020] The mask has handles fixedly connected to both the left and right sides of its exterior, and protective sleeves are fixedly connected to the outside of the handles.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, by wearing a mask on the face, when inhaling, the airflow passes through the filter cartridge and enters the mask through a one-way valve to supply oxygen. When exhaling, the one-way valve intercepts the airflow and pushes the piston upward. The piston blocks the top hole of the mask according to the degree of breathing. The exhaled air is filtered through the perforated filter screen and discharged. It can maintain the air circulation inside the mask according to the changes in breathing, thereby improving the practicality of the device.

[0023] 2. In this utility model, the rotating rod drives the bevel gear 2 to rotate, and the bevel gear 1 rotates through meshing. The inner baffle 1 rotates along the baffle 2. When rotating, the holes of the two baffles intersect or stagger. By adjusting the degree of stagger, the flow rate of the airflow drawn in from the filter cartridge can be precisely controlled, thereby meeting different usage requirements. Attached Figure Description

[0024] Figure 1 This is a perspective view of the anti-backflow structure of the breathing valve of the fire escape mask proposed in this utility model;

[0025] Figure 2 This is a front view of the anti-backflow structure of the breathing valve of the fire escape mask proposed in this utility model;

[0026] Figure 3 This is a side view of the anti-backflow structure of the breathing valve of the fire escape mask proposed in this utility model;

[0027] Figure 4 This is a partial structural exploded view of the adjustment mechanism of the anti-backflow structure of the breathing valve of the fire escape mask proposed in this utility model;

[0028] Figure 5 This is a partial structural breakdown diagram of the anti-backflow structure of the breathing valve of the fire escape mask proposed in this utility model.

[0029] Legend:

[0030] 1. Face mask; 2. Adjustment mechanism; 201. Rotating rod; 202. Bevel gear one; 203. Baffle one; 204. Baffle two; 205. Bevel gear two; 3. Filter cartridge; 4. Baffle three; 5. Mesh groove; 6. Piston; 7. One-way valve; 8. Top plate; 9. Filter screen; 10. Insert block; 11. Slot; 12. Handle; 13. Protective sleeve; 14. Slide groove; 15. Positioning block; 16. Positioning hole; 17. Knob; 18. Sealing plate. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 3 and Figure 5An embodiment of this utility model provides a backflow prevention structure for the breathing valve of a fire escape mask, including a mask 1, a filter cartridge 3 that is engaged in the middle of the front side of the mask 1, the filter cartridge 3 can filter air, a baffle 3 4 is fixedly connected to the rear side of the inside of the mask 1, and multiple mesh grooves 5 are opened around the outer perimeter of the baffle 3 4. A piston 6 is slidably connected to the outer side of the mesh grooves 5. The piston 6 moves up and down with breathing, a one-way valve 7 is fixedly connected to the middle of the inner side of the mask 1, the one-way valve 7 can intercept exhalation and allow air intake, a top plate 8 is provided on the top of the mask 1, a filter screen 9 is fixedly connected to the bottom of the top plate 8, the filter screen 9 can intercept impurities in the airflow, and an adjustment mechanism 2 is provided on the inner side of the mask 1, the adjustment mechanism 2 is used to adjust the airflow rate;

[0033] Specifically, after the user puts the mask 1 on their face, when inhaling, the airflow passes through the filter cartridge 3 and enters the mask 1 through the one-way valve 7 for breathing. When exhaling, the one-way valve 7 intercepts the airflow and pushes the piston 6 upward. The piston 6 partially blocks the top hole of the mask 1 according to the exhalation force. The exhaled air is filtered through the filter screen 9 at the hole and then discharged, maintaining air circulation inside the mask 1.

[0034] Reference Figure 2 and Figure 4 The adjustment mechanism 2 includes a rotating rod 201, which is rotatably connected to the bottom inner side of the mask 1. A bevel gear 205 is fixedly connected to the top of the rotating rod 201. When the rotating rod 201 rotates, it can drive the bevel gear 205 to rotate. A bevel gear 202 is rotatably connected to the front inner side of the mask 1. A baffle 203 is fixedly connected to the inner side of the bevel gear 202. When the bevel gear 202 rotates, it can drive the baffle 203 to rotate. A baffle 204 is fixedly connected to the middle inner side of the mask 1. The bevel gear 202 and the bevel gear 205 are meshed together. Rotating the bevel gear 202 can drive the bevel gear 205 to rotate.

[0035] Specifically, when the rotating rod 201 rotates, it will synchronously drive the bevel gear 205 installed on it to rotate. The bevel gear 205 drives the bevel gear 202 to rotate through meshing, which in turn causes the baffle 203 on the inner side of the bevel gear 202 to rotate along the baffle 204. The holes on the baffle 203 and the baffle 204 intersect or stagger during rotation. By adjusting the degree of staggering, the flow rate of the airflow drawn in from the filter cartridge 3 can be precisely controlled.

[0036] Reference Figure 1 , Figure 2 and Figure 4A positioning block 15 is fixedly connected to the middle of the bottom end of the mask 1. A positioning hole 16 is provided on the inner side of the positioning block 15. The positioning hole 16 on the outer side of the positioning block 15 facilitates the storage or hanging of the device. A knob 17 is rotatably connected to the front of the bottom end of the mask 1. The top of the knob 17 passes through the mask 1 and is fixedly connected to the rotating rod 201. Rotating the knob 17 can synchronously drive the rotating rod 201 to rotate. Insert blocks 10 are fixedly connected to the bottom of the top plate 8 around the perimeter. Slots 11 are provided on the top of the mask 1 around the perimeter. The insert blocks 10 engage with the slots 11. The engagement of the insert blocks 10 with the slots 11 can improve the sealing of the top plate 8.

[0037] Specifically, the positioning hole 16 on the positioning block 15 allows the device to be held and suspended when not in use. The rotating knob 17 facilitates the rotation of the rotating rod 201. The engagement of the slot 11 and the insert block 10 enhances the sealing of the connection between the top plate 8 and the face mask 1.

[0038] Reference Figure 3 , Figure 4 and Figure 5 The mask 1 has sliding grooves 14 on both the left and right sides inside. The sliding grooves 14 are slidably connected to the piston 6. The piston 6 can improve the stability of the sliding grooves 14 when they move. The mask 1 has sealing plates 18 fixedly connected to the left and right sides of the rear end. The outer side of the sealing plates 18 is fixedly connected to the baffle 3 4. The sealing plates 18 can improve the sealing effect of the baffle 3 4. The mask 1 has handles 12 fixedly connected to the left and right sides outside. The outer side of the handles 12 is fixedly connected to the protective sleeves 13. The handles 12 and the protective sleeves 13 on them can facilitate the gripping and carrying of the device.

[0039] Specifically, the slide groove 14 can improve the stability of the piston 6 when it moves up and down, while the sealing plate 18 can improve the sealing effect between the mask 1 and the baffle 3 4. The handle 12 can make it easy to hold the mask 1, and the protective cover 13 on it can improve the comfort of holding it.

[0040] Working principle: Before using the device, the mask 1 is first worn on the user's face. As the user inhales, the airflow is filtered through the filter cartridge 3 and enters the mask 1 through the one-way valve 7 to provide oxygen to the user. When the user exhales, the airflow is blocked by the one-way valve 7 and pushes the piston 6 to move upward. At this time, the piston 6 will block the hole at the top of the mask 1 to different degrees according to the user's breathing level. The hole can be filtered through the filter screen 9 and the exhaled airflow in the mask 1 is discharged.

[0041] Furthermore, the rotation of the rotating rod 201 can simultaneously drive the second bevel gear 205 on it to rotate. At this time, the rotation of the second bevel gear 205 can drive the first bevel gear 202 to rotate through meshing. When the first bevel gear 202 rotates, the first baffle 203 on its inner side will rotate along the second baffle 204. At this time, through the rotation of the first baffle 203 and the second baffle 204, the holes on them will intersect and stagger. By adjusting the degree of staggering, the flow rate of airflow drawn in from the filter cartridge 3 can be controlled.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A backflow prevention structure for the breathing valve of a fire escape mask, comprising a mask (1), characterized in that: A filter cartridge (3) is engaged in the middle of the front side of the mask (1). A baffle plate (4) is fixedly connected to the rear side of the inside of the mask (1). Multiple mesh grooves (5) are opened around the outside of the baffle plate (4). A piston (6) is slidably connected to the outside of the mesh grooves (5). A one-way valve (7) is fixedly connected to the middle of the inside of the mask (1). A top plate (8) is provided on the top of the mask (1). A filter screen (9) is fixedly connected to the bottom of the top plate (8). An adjustment mechanism (2) is provided on the inside of the mask (1). The adjustment mechanism (2) is used to adjust the airflow rate.

2. The backflow prevention structure of the breathing valve of the fire escape mask according to claim 1, characterized in that: The adjustment mechanism (2) includes a rotating rod (201), which is rotatably connected to the bottom inner side of the mask (1). A bevel gear two (205) is fixedly connected to the top of the rotating rod (201). A bevel gear one (202) is rotatably connected to the front inner side of the mask (1). A baffle one (203) is fixedly connected to the inner side of the bevel gear one (202). A baffle two (204) is fixedly connected to the middle inner side of the mask (1). The bevel gear one (202) and the bevel gear two (205) are meshed together.

3. The backflow prevention structure of the breathing valve of the fire escape mask according to claim 1, characterized in that: A positioning block (15) is fixedly connected to the middle of the bottom end of the mask (1), and a positioning hole (16) is provided on the inner side of the positioning block (15).

4. The backflow prevention structure of the breathing valve of the fire escape mask according to claim 2, characterized in that: A knob (17) is rotatably connected to the front of the bottom end of the mask (1). The top of the knob (17) passes through the mask (1) and is fixedly connected to the rotating rod (201).

5. The backflow prevention structure for the breathing valve of the fire escape mask according to claim 1, characterized in that: The bottom of the top plate (8) is fixedly connected with inserts (10) around the perimeter, and the top of the mask (1) is provided with slots (11) around the perimeter, and the inserts (10) engage with the slots (11).

6. The backflow prevention structure for the breathing valve of the fire escape mask according to claim 1, characterized in that: The mask (1) has grooves (14) on both the left and right sides inside, and the grooves (14) are slidably connected to the piston (6).

7. The backflow prevention structure for the breathing valve of the fire escape mask according to claim 1, characterized in that: Sealing plates (18) are fixedly connected to the left and right sides of the rear end of the mask (1), and the outer side of the sealing plate (18) is fixedly connected to the baffle (4).

8. The backflow prevention structure of the breathing valve of the fire escape mask according to claim 1, characterized in that: The mask (1) has handles (12) fixedly connected to both the left and right sides of its exterior, and a protective sleeve (13) is fixedly connected to the outside of the handles (12).

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