A new positive pressure chemical oxygen respirator

Abstract

The application discloses a novel positive pressure type chemical oxygen respirator and relates to the technical field of breathing equipment, which aims to solve the technical problems that the chemical oxygen respirator is difficult to achieve reliable positive pressure protection effect and the mask is easy to fog and frost in the prior art. The novel positive pressure type chemical oxygen respirator comprises a breathing mask, an exhalation pipe, a main machine backpack, an exhalation bag, an inhalation pipe, an oxygen generation tank and a cooling box, the oxygen generation tank and the cooling box are fixed in the main machine backpack, the breathing mask is connected with the exhalation bag, and the exhalation pipe enters the main machine backpack to communicate the exhalation bag with the oxygen generation tank. The novel positive pressure type chemical oxygen respirator can provide positive pressure protection, can defog and self-clean the eyepiece of the breathing mask, and can prevent the vision of a user from being blocked.

Description

Technical Field

[0001] This invention relates to the field of respiratory equipment technology, and in particular to a novel positive pressure chemical oxygen respirator. Background Technology

[0002] In scenarios such as hazardous chemical leaks, tunnel and mine rescues, and fire accidents, the oxygen concentration in the air is low, and there may even be various toxic and harmful gases present, requiring rescuers to wear respiratory protective equipment.

[0003] In existing technologies, compressed air breathing apparatuses have limited capacity, making it difficult to supply oxygen for extended periods. Compressed oxygen breathing apparatuses are heavy and complex to use and maintain. Chemical oxygen breathing apparatuses struggle to replenish large amounts of oxygen in a short time, making it difficult to achieve reliable positive pressure protection. When working in environments with toxic or harmful gases, if the breathing apparatus fails to maintain positive pressure, it can easily endanger the user's health. Furthermore, the breathing apparatus mask is prone to fogging or frost, affecting the user's vision and severely reducing work efficiency or even jeopardizing user safety. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a novel positive pressure chemical oxygen respirator to solve the technical problems of existing chemical oxygen respirators that are difficult to achieve reliable positive pressure protection and whose masks are prone to fogging and frosting.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] A novel positive-pressure chemical oxygen respirator includes a breathing mask, an exhalation tube, a main unit backpack, an exhalation bag, an inhalation tube, an oxygen generator, and a cooling box, wherein the oxygen generator and the cooling box are fixed inside the main unit backpack.

[0007] Furthermore, the breathing mask is connected to the exhalation bag, and the exhalation tube enters the main backpack to connect the exhalation bag to the oxygen generator.

[0008] Furthermore, it also includes a gas mixing component and a positive pressure component, the gas mixing component being connected to the positive pressure component, the positive pressure component being connected to the cooling box, and the cooling box being connected to the breathing mask through the inhalation tube.

[0009] Furthermore, the gas mixing assembly includes a compressed air cylinder and a heat exchanger, both of which are connected to the compressed air cylinder, and the heat exchanger is connected to the oxygen generation tank.

[0010] Furthermore, a switch valve is provided on the compressed air cylinder, the switch valve passes through the main unit backpack, and the switch valve can control the gas in the compressed air cylinder to enter the heat exchanger.

[0011] Furthermore, a temperature sensor is installed inside the heat exchanger, and the temperature sensor will trigger an alarm when the temperature inside the heat exchanger is too high.

[0012] Furthermore, the positive pressure assembly includes a positive pressure housing, a positive pressure airbag, a pressure plate, and an elastic element. The positive pressure airbag, the pressure plate, and the elastic element are disposed inside the positive pressure housing. The positive pressure airbag is connected to the compressed air bottle, the heat exchanger, and the cooling box through a gas pipeline.

[0013] Furthermore, the pressure plate is connected to the positive pressure shell through the elastic element, the positive pressure airbag is placed on the pressure plate, and the elastic element is in a compressed state.

[0014] Furthermore, a pressure sensor valve is provided on one end of the positive pressure airbag that is connected to the compressed air bottle. The pressure sensor valve is used to control the gas in the compressed air bottle to enter the positive pressure airbag.

[0015] Furthermore, the breathing mask includes an eyepiece.

[0016] Furthermore, the exhalation bag includes a bag body, a connecting end, and a one-way air-blocking part. One end of the bag body is connected to the breathing mask through the connecting end, and the other end is connected to the exhalation tube. The one-way air-blocking part is disposed inside the connecting end.

[0017] Furthermore, the diameter of the connecting end gradually increases from the breathing mask toward the bladder body. The one-way air-blocking part includes a spring and a one-way plug. The one-way plug is connected to the end face of the connecting end near the breathing mask through the spring. The diameter of the one-way plug is smaller than the diameter of the end of the connecting end connected to the bladder body, but larger than the diameter of the end of the connecting end connected to the breathing mask.

[0018] Furthermore, when the spring is not under force, the one-way plug closes the connection end.

[0019] Furthermore, the breathing mask also includes an air blowing tube and a cleaning assembly. The cleaning assembly includes a housing disposed in the lower center of the eyepiece, and the air blowing tube connects the housing to the heat exchanger.

[0020] Furthermore, the housing is provided with a plurality of air vents, which are located on the side of the eyepiece facing the user.

[0021] Furthermore, the cleaning assembly also includes a cleaning scraper and a pneumatic wheel. The pneumatic wheel is disposed inside the housing and connected to the housing via a bearing seat. The gas in the heat exchange tube enters the housing through the air blowing pipe and can blow the pneumatic wheel to rotate.

[0022] Furthermore, a connector is provided on the pneumatic wheel, a connecting groove is provided at one end of the cleaning scraper, the connector is in the connecting groove, and the other end of the cleaning scraper passes through the housing and contacts the eyepiece.

[0023] Furthermore, a brush or sponge is provided on the side of the cleaning scraper that contacts the eyepiece.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] (1) The novel positive pressure chemical oxygen respirator provided by the present invention can collect carbon dioxide produced by the user's breathing by setting an exhalation tube, an inhalation tube, an oxygen generator and a cooling box, and make the carbon dioxide react chemically in the oxygen generator to produce oxygen. After being cooled by the cooling box, the oxygen is transferred to the oxygen mask by the inhalation tube, thereby providing oxygen to the user. It is convenient to use and has a simple structure. It produces oxygen by chemical oxygen method. It only requires the user to exhale carbon dioxide and water vapor to produce oxygen, which can ensure a sufficient supply of oxygen and a stable supply.

[0026] (2) The novel positive pressure chemical oxygen respirator provided by the present invention can provide positive pressure protection for the oxygen generation process of the oxygen tank by setting a gas mixing component and a positive pressure component, and prevent leakage of the breathing mask; by setting a compressed air cylinder, it can supply oxygen in time and maintain positive pressure when it is difficult for the oxygen tank to generate a large amount of oxygen in a short period of time in the initial stage, and dilute the oxygen when the oxygen concentration generated by the oxygen tank is high, so as to prevent the user from getting oxygen intoxication; by setting a heat exchanger, the compressed air can exchange heat with the high temperature oxygen generated by the oxygen tank, pre-cool the gas supplied to the user for breathing, increase the cooling effect of the chemical oxygen respirator, and reduce the loss of the cooling box.

[0027] (3) The novel positive-pressure chemical oxygen respirator provided by this invention can prevent fogging or frost formation on the eyepiece by setting an air blowing pipe and a cleaning component, and further clean the dust and fog on the eyepiece, avoiding the eyepiece from blurring and affecting the user's vision, thus preventing safety hazards. The air blowing pipe connects the shell to the heat exchanger. Gas from the heat exchanger is driven into the shell by the compressed air cylinder, and the mixed gas with a certain temperature is blown onto the eyepiece through the air outlet on the shell to prevent fogging or frost formation on the eyepiece. The gas entering the shell blows the pneumatic wheel, which drives the cleaning scraper to swing, thereby cleaning the dust and fog on the eyepiece. The operation is simple and requires no manual intervention. The defogging and self-cleaning of the eyepiece can be achieved simply by opening the compressed air cylinder by switching the valve, thus improving the safety of the chemical oxygen respirator.

[0028] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0029] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0030] Figure 1 This is a schematic diagram of the overall structure of the novel positive pressure chemical oxygen respirator according to Embodiment 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of the internal structure of the main backpack according to Embodiment 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of the connection end in Embodiment 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the internal structure of the positive pressure component according to Embodiment 1 of the present invention;

[0034] Figure 5 This is a schematic diagram of the overall structure of the novel positive pressure chemical oxygen respirator according to Embodiment 2 of the present invention;

[0035] Figure 6 This is a schematic diagram of the internal structure of the main backpack in Embodiment 2 of the present invention;

[0036] Figure 7 This is a schematic diagram of the internal structure of the housing in Embodiment 2 of the present invention.

[0037] Figure label:

[0038] 1-Breathing mask; 11-Blow-out tube; 12-Cleaning component; 121-Shell; 122-Cleaning scraper; 1221-Connecting groove; 123-Pneumatic wheel; 1231-Connector; 13-Eyepiece; 2-Exhalation tube; 3-Main unit backpack; 4-Exhalation bag; 41-Bag body; 42-Connecting end; 43-One-way air dam; 431-Spring; 432-One-way plug; 5-Inhalation tube; 6-Oxygen tank; 7-Positive pressure component; 71-Positive pressure outer shell; 72-Positive pressure airbag; 73-Pressure plate; 74-Elastic element; 8-Cooling box; 9-Gas mixing component; 91-Compressed air cylinder; 911-Switch valve; 92-Heat exchanger. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of the present invention and are used together with the invention to illustrate the principles of the invention.

[0040] Example 1

[0041] This embodiment provides a novel positive pressure chemical oxygen respirator, such as... Figures 1-2 As shown, the device includes a breathing mask 1, an exhalation tube 2, a main unit backpack 3, an exhalation bag 4, an inhalation tube 5, an oxygen generator 6, and a cooling box 8. The oxygen generator 6 and the cooling box 8 are fixed inside the main unit backpack 3. The breathing mask 1 is connected to the exhalation bag 4 to collect and buffer the exhaled gas. The exhalation tube 2 enters the main unit backpack 3 and connects the exhalation bag 4 to the oxygen generator 6, thereby using the carbon dioxide and water vapor produced by breathing to react with the oxygen generator to produce oxygen. To prevent the oxygen produced by the oxygen generator 6 from being too hot and causing harm to the user, the cooling box 8 is connected to the breathing mask 1 through the inhalation tube 5, thereby delivering oxygen into the breathing mask 1 for the user to breathe.

[0042] Preferably, the main unit backpack 3 is equipped with a shoulder strap for easy carrying by the user.

[0043] like Figure 3 As shown, the exhalation bag 4 includes a bag body 41, a connecting end 42, and a one-way air-blocking part 43. One end of the bag body 41 is connected to the breathing mask 1 through the connecting end 42, and the other end is connected to the exhalation tube 2. The one-way air-blocking part 43 is disposed in the connecting end 42. The one-way air-blocking part 43 is used to allow the exhaled carbon dioxide to enter the exhalation bag 4 and prevent the gas in the exhalation bag 4 from entering the breathing mask 1.

[0044] Furthermore, the diameter of the connecting end 42 gradually increases from the breathing mask 1 toward the bag body 41. The one-way air-blocking part 43 includes a spring 431 and a one-way plug 432. The one-way plug 432 is connected to the end face of the connecting end 42 near the breathing mask 1 through the spring 431. The diameter of the one-way plug 432 is smaller than the diameter of the end of the connecting end 42 connected to the bag body 41, and larger than the diameter of the end of the connecting end 42 connected to the breathing mask 1. When the spring 431 is not under force, the one-way plug 432 closes the connecting end 42.

[0045] When the user exhales, the exhaled air enters the bag 41 through the connecting end 42 and pushes the one-way plug 432 toward the bag 41, causing the spring 431 to stretch. When the user stops exhaling, the spring 431 returns to its original position, causing the one-way plug 432 to close the connecting end 42, preventing the air in the bag 41 from entering the breathing mask.

[0046] The oxygen generator 6 contains a chemical substance that can react with carbon dioxide to produce oxygen. For example, potassium superoxide may be the chemical substance contained in the oxygen generator 6. When the carbon dioxide exhaled by the user enters the oxygen generator 6, it undergoes a chemical reaction to generate high-temperature oxygen. The oxygen generator 6 is existing technology and will not be described in detail here.

[0047] Furthermore, such as Figure 2 As shown, the novel positive-pressure chemical oxygen respirator also includes a gas mixing component 9 and a positive-pressure component 7. The gas mixing component 9 is connected to the positive-pressure component 7, and the positive-pressure component 7 is connected to the cooling box 8. The gas mixing component 9 includes a compressed air cylinder 91 and a heat exchanger 92. Both the heat exchanger 92 and the positive-pressure component 7 are connected to the compressed air cylinder 91, and the heat exchanger 92 is connected to the oxygen generator 6. A switch valve 911 is installed on the compressed air cylinder 91, and the switch valve 911 passes through the main unit backpack 3, allowing the user to easily adjust the switch valve 911. The switch valve 911 controls the flow of gas from the compressed air cylinder 91 into the heat exchanger 92.

[0048] Preferably, a temperature sensor is installed inside the heat exchanger 92. When the temperature inside the heat exchanger 92 is too high, the temperature sensor will sound an alarm to remind the user to open the switch valve 911 so that the air in the compressed air bottle 91 can enter the heat exchanger 92 to mix with oxygen and lower the temperature.

[0049] Preferably, an oxygen concentration sensor is installed inside the breathing mask 1. When the oxygen concentration inside the breathing mask 1 is too high, the oxygen concentration sensor will sound an alarm, reminding the user to open the switch valve 911 to dilute the oxygen and prevent the user from experiencing oxygen intoxication. When the oxygen concentration inside the breathing mask 1 is too low, the oxygen concentration sensor will sound an alarm, reminding the user to open the switch valve 911 to allow the air in the compressed air cylinder 91 to provide auxiliary oxygen.

[0050] Preferably, a pressure gauge is installed on the switching valve 911.

[0051] like Figure 4 As shown, the positive pressure assembly 7 includes a positive pressure housing 71, a positive pressure airbag 72, a pressure plate 73, and an elastic element 74. The positive pressure airbag 72, pressure plate 73, and elastic element 74 are disposed inside the positive pressure housing 71, which is fixed inside the main unit backpack 3. The positive pressure airbag 72 is connected to the compressed air cylinder 91, the heat exchanger 92, and the cooling box 8 via a gas pipeline, so that the gas in the heat exchanger 92 enters the positive pressure airbag 72 and then enters the cooling box 8 for cooling. The pressure plate 73 is connected to the positive pressure housing 71 via the elastic element 74. The positive pressure airbag 72 is placed on the pressure plate 73, and the elastic element 74 is in a compressed state, causing the pressure plate 73 to squeeze the positive pressure airbag 72. A pressure sensor valve is installed on the end of the positive pressure airbag 72 that is connected to the compressed air cylinder 91, and the pressure sensor valve controls the gas in the compressed air cylinder 91 to enter the positive pressure airbag 72. The pressure sensor valve is prior art and will not be described in detail here.

[0052] When the gas in the heat exchanger 92 enters the positive pressure bladder 72, the positive pressure bladder 72 inflates and expands. The gas in the positive pressure bladder 72 resists the pressure of the pressure plate 73, keeping the gas in the positive pressure bladder 72 in a positive pressure state. When there is less gas in the positive pressure bladder 72, the pressure plate 73 squeezes the positive pressure bladder 72 and deforms it. The pressure sensor valve senses the pressure change in the positive pressure bladder 72 and controls the gas in the compressed air bottle 91 to enter the positive pressure bladder 72, causing the positive pressure bladder 72 to inflate and expand, resisting the pressure of the pressure plate 73.

[0053] Preferably, the pressure sensor valve is equipped with a signal receiver, which can control the opening and closing of the pressure sensor valve. When the novel positive pressure chemical oxygen respirator is not in use, the signal receiver can control the pressure sensor valve to close, preventing gas from the compressed air cylinder 91 from entering the positive pressure airbag 72 and causing waste.

[0054] For example, the elastic element 74 is a spring.

[0055] For example, the cooling box 8 is an ice box or a paraffin box, which cools the gas entering the breathing mask 1 to prevent the gas temperature from being too high and causing burns to the user. The cooling box 8 is prior art and will not be described in detail here.

[0056] When the novel positive-pressure chemical oxygen respirator is used for oxygen supply, the carbon dioxide produced by the user's breathing enters the oxygen generator 6 through the exhalation bag 4, reacts with the medicine in the oxygen generator 6 to produce high-temperature oxygen. The high-temperature oxygen exchanges heat with the compressed air in the compressed air bottle 91 in the heat exchanger 92 to form a mixed gas, which then enters the positive pressure component 7 to form positive pressure protection. The mixed gas in the positive pressure component 7 enters the cooling box 8 for further cooling, and then enters the breathing mask 1 through the inhalation tube 5 to supply oxygen to the user.

[0057] Example 2

[0058] This embodiment provides a novel positive pressure chemical oxygen respirator, such as... Figures 5-6 As shown, the difference from Embodiment 1 is that the breathing mask 1 includes an air blowing tube 11, a cleaning component 12 and an eyepiece 13. The air blowing tube 11 and the cleaning component 12 are used to prevent the eyepiece 13 from fogging or frosting, and to clean the dust and fog on the eyepiece 13.

[0059] The cleaning assembly 12 includes a housing 121, which is located in the lower center of the eyepiece 13. An air blowing pipe 11 connects the housing 121 to the heat exchanger 92. Multiple air outlets are provided on the housing 121, located on the side of the eyepiece 13 facing the user, for blowing air onto the eyepiece 13. When fog appears on the eyepiece 13, the compressed air cylinder 91 is opened via the switch valve 911. The air in the compressed air cylinder 91 mixes with the high-temperature oxygen generated by the oxygen tank 6 to form a high-temperature mixed gas. The positive pressure within the compressed air cylinder 91 forces a portion of this mixed gas through the air blowing pipe 11 into the housing 121, and then blown onto the eyepiece 13 through the air outlets, dissipating the fog on the eyepiece 13. Figure 7 As shown, the cleaning assembly 12 also includes a cleaning scraper 122 and a pneumatic wheel 123. The pneumatic wheel 123 is disposed inside the housing 121 and connected to the housing 121 via a bearing seat. The position of the pneumatic wheel 123 matches the air blowing pipe 11. Gas from the heat exchanger enters the housing 121 through the air blowing pipe 11 and can drive the pneumatic wheel 123 to rotate. A connector 1231 is provided on the pneumatic wheel 123, and a connecting groove 1221 is provided on the cleaning scraper 122. The connector 1231 is located in the connecting groove 1221, thereby connecting the cleaning scraper 122 and the pneumatic wheel 123. The other end of the cleaning scraper 122 penetrates the housing 121 and contacts the eyepiece 13. The cleaning scraper 122 can clean dust and debris on the eyepiece 13. The cleaning scraper 122 is connected to the housing 121 by a bearing.

[0060] It should be noted that a connection gap is provided between the cleaning scraper 122 and the housing 121 to prevent the connecting shaft between the pneumatic wheel 123 and the housing 121 from interfering with the swing of the cleaning scraper 122.

[0061] It is understandable that when the pneumatic wheel 123 is blown and rotated, the connector 1231 moves in the connecting groove 1221 as the pneumatic wheel 123 rotates, thereby driving the cleaning scraper 122 to swing along the bearing connected to the housing 121, and cleaning the eyepiece 13 by the swing of the cleaning scraper 122.

[0062] Preferably, a brush or sponge is provided on the side of the cleaning scraper 122 that contacts the eyepiece 13, so that the eyepiece 13 can be cleaned better by the brush or sponge.

[0063] Preferably, a pipeline switch is provided at the connection between the air blowing pipe 11 and the housing 121. When it is not necessary to defog the eyepiece 13, the pipeline switch is in the closed state; when it is necessary to defog or clean the eyepiece 13, the pipeline switch is in the open state, so that the gas enters the housing 121 through the air blowing pipe 11.

[0064] When eyepiece 13 fogs up or needs cleaning, the compressed air cylinder 91 is opened via the switch valve 911, allowing the gas in the compressed air cylinder 91 to enter the heat exchanger 92 and exchange heat with the high-temperature oxygen generated by the oxygen tank 6. After mixing, the gas enters the housing 121 through the air blowing pipe 11. The gas transmitted through the air blowing pipe 11 drives the pneumatic wheel 123 to rotate, causing the cleaning scraper 122 to rotate around the bearing connected to the housing 121 under the cooperation of the connector 1231 and the connecting groove 1221. Thus, the cleaning scraper 122 cleans the eyepiece 13 by swinging. The gas transmitted through the air blowing pipe 11 is blown onto the eyepiece 13 through the air outlet, causing the fog on the eyepiece 13 to dissipate and preventing the eyepiece 13 from fogging up or being contaminated by dust and affecting the user's vision.

[0065] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel positive-pressure chemical oxygen respirator, characterized in that, It includes a breathing mask (1), an exhalation tube (2), a main unit backpack (3), an exhalation bag (4), an inhalation tube (5), an oxygen generator (6), and a cooling box (8), wherein the oxygen generator (6) and the cooling box (8) are fixed inside the main unit backpack (3).

2. The novel positive-pressure chemical oxygen respirator according to claim 1, characterized in that, The breathing mask (1) is connected to the exhalation bag (4), and the exhalation tube (2) enters the main backpack (3) to connect the exhalation bag (4) to the oxygen generator (6).

3. The novel positive pressure chemical oxygen respirator according to claim 2, characterized in that, It also includes a gas mixing component (9) and a positive pressure component (7), the gas mixing component (9) being connected to the positive pressure component (7), the positive pressure component (7) being connected to the cooling box (8), and the cooling box (8) being connected to the breathing mask (1) through the inhalation tube (5).

4. The novel positive pressure chemical oxygen respirator according to claim 3, characterized in that, The gas mixing assembly (9) includes a compressed air cylinder (91) and a heat exchanger (92). The heat exchanger (92) and the positive pressure assembly (7) are both connected to the compressed air cylinder (91), and the heat exchanger (92) is connected to the oxygen generation tank (6).

5. The novel positive-pressure chemical oxygen respirator according to claim 4, characterized in that, A switch valve (911) is provided on the compressed air cylinder (91), the switch valve (911) passes through the host backpack (3), and the switch valve (911) can control the gas in the compressed air cylinder (91) to enter the heat exchanger (92).

6. The novel positive-pressure chemical oxygen respirator according to claim 4, characterized in that, A temperature sensor is installed inside the heat exchanger (92). When the temperature inside the heat exchanger (92) is too high, the temperature sensor will trigger an alarm.

7. The novel positive-pressure chemical oxygen respirator according to claim 4, characterized in that, The positive pressure assembly (7) includes a positive pressure housing (71), a positive pressure airbag (72), a pressure plate (73), and an elastic element (74). The positive pressure airbag (72), the pressure plate (73), and the elastic element (74) are disposed inside the positive pressure housing (71). The positive pressure airbag (72) is connected to the compressed air cylinder (91), the heat exchanger (92), and the cooling box (8) through a gas pipeline.

8. The novel positive-pressure chemical oxygen respirator according to claim 7, characterized in that, The pressure plate (73) is connected to the positive pressure shell (71) through the elastic element (74), the positive pressure airbag (72) is placed on the pressure plate (73), and the elastic element (74) is in a compressed state.

9. The novel positive-pressure chemical oxygen respirator according to claim 7, characterized in that, A pressure sensor valve is provided on one end of the positive pressure airbag (72) that is connected to the compressed air bottle (91). The pressure sensor valve is used to control the gas in the compressed air bottle (91) to enter the positive pressure airbag (72).

10. The novel positive-pressure chemical oxygen respirator according to any one of claims 1-9, characterized in that, The breathing mask (1) includes an eyepiece (13).

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