An intelligent compensation supply device for the circulating gas of a positive pressure fire fighting oxygen breathing apparatus

Abstract

The present invention relates to the technical field of fire-fighting and rescue equipment, and specifically relates to an intelligent compensation supply device for circulating gas of a positive pressure fire-fighting oxygen respirator. It includes a backplate and a gas cylinder installed on the backplate. The backplate is arc-shaped and looks like a C shape in a top view. A first pressure reducing valve is installed at the air outlet. A pressure gauge is installed on the first pressure reducing valve through a first hose. The first pressure reducing valve is connected to a breathing mask through an air supply pipe. Compared with the traditional open-circuit oxygen respirator, the gas exhaled by the rescuer is compressed into the C-shaped airbag under the action of a spherical compressor. The flow sensor in the breathing mask part monitors the breathing frequency of the rescuer. According to the actual activity intensity of the rescuer, under the action of the circulation mechanism, the gas in the C-shaped airbag is filtered for carbon dioxide and then supplemented into the air supply pipe, greatly extending the single rescue time of the rescuer, and the weight only increases by about 3 kg, which is much lower than that of the traditional closed-circuit oxygen respirator.

Description

Technical Field

[0001] The present invention relates to the technical field of fire-fighting and rescue equipment, and particularly to an intelligent compensation supply device for circulating gas of a positive-pressure fire-fighting oxygen breathing apparatus. Background Technique

[0002] At present, fire-fighting and rescue oxygen breathing apparatuses on the market are mainly divided into two categories: closed-circuit type and open-circuit type. The closed-circuit breathing apparatus efficiently filters and cools the gas exhaled by the rescuer through a precise system, and timely supplements fresh oxygen to maintain recycling. This mechanism significantly extends the oxygen supply duration, especially suitable for large and complex fire-fighting on-site operations. However, to achieve the above high efficiency, the closed-circuit breathing apparatus needs to be equipped with a series of auxiliary devices, including a cleaning tank filled with absorbents such as calcium hydroxide, a cooler with internal water ice or blue ice, and a backpack for stabilizing internal components. Coupled with the weight of the oxygen cylinder, the overall weight often exceeds 20 kg, posing a severe challenge to the physical strength of rescue personnel.

[0003] In contrast, the open-circuit breathing apparatus has a more concise structure, mainly composed of a high-pressure gas cylinder (filled with an oxygen-nitrogen mixed gas), a lightweight backplate fixing system, and a breathing mask. When using an oxygen cylinder with a capacity of 6.8 L, the overall weight is controlled at about 10 kg, only half of that of the closed-circuit type, and it is convenient and quick to wear. Unfortunately, the open-circuit breathing apparatus directly releases the exhaled gas into the environment, and the oxygen supply of the rescuer completely depends on the limited cylinder capacity, restricting the duration of a single rescue.

[0004] In summary, the existing oxygen breathing apparatuses have their respective limitations and limited applicable scenarios. Through the unremitting efforts and repeated tests of industry experts, we propose an intelligent compensation supply device for circulating gas of a positive-pressure fire-fighting oxygen breathing apparatus with strong comprehensive capabilities and a wide range of applicable scenarios. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides an intelligent compensation supply device for circulating gas of a positive-pressure fire-fighting oxygen breathing apparatus, including a backplate and a gas cylinder installed on the backplate. The backplate is arc-shaped and is C-shaped when viewed from above. A first pressure reducing valve is installed at the gas outlet of the gas cylinder. A pressure gauge is installed on the gas cylinder through a first hose. The first pressure reducing valve is connected to a breathing mask through a supply pipe, and further includes:

[0006] Shoulder straps, the shoulder straps are installed on the backplate, there are two, and turntables are installed at one end of the shoulder straps located above the backplate. The turntables are rotatably connected to the backplate. Braided sleeves are installed on the shoulder straps, and the first hose is located in the braided sleeve on one side;

[0007] Waist tightening straps, the waist tightening straps are installed on the backplate;

[0008] A spherical compressor, which is mounted on a back plate through a bracket and is located on the protruding side of the back plate;

[0009] A circulation mechanism, which is mounted on the back plate and is connected to a breathing mask and a gas cylinder. The circulation mechanism collects the gas exhaled by the rescuer and filters and supplements the corresponding amount of the collected gas into the air supply pipe according to the activity intensity of the rescuer.

[0010] In some embodiments, the circulation mechanism includes a second hose mounted on the breathing mask. One end of the second hose is communicated with the exhaust port of the breathing mask, and the other end is communicated with the intake port of the spherical compressor. It also includes through holes oppositely formed on the back plate, and a C-shaped airbag is installed in the through holes. A third hose is communicated with the C-shaped airbag, and the end of the third hose away from the C-shaped airbag is communicated with the exhaust port of the spherical compressor. It further includes a limiting member mounted on the back plate and a compensating member mounted on the C-shaped airbag. The limiting member is used to limit the position and maximum deformation degree of the C-shaped airbag, and the compensating member changes the supply amount of the gas in the air supply pipe according to the breathing condition of the rescuer.

[0011] In some embodiments, the limiting member includes a woven belt mounted on the concave side of the back plate. The woven belt cooperates with the back plate to clamp the part of the C-shaped airbag on the corresponding side of the back plate. A high-density woven mesh sleeve is sleeved outside the C-shaped airbag, and the woven sleeve, the woven belt, and the high-density woven mesh sleeve are all composed of high-temperature and wear-resistant fibers.

[0012] In some embodiments, the compensating member includes a pressure valve communicated with the C-shaped airbag. A second pressure reducing valve is connected to the pressure valve, a first electronically controlled flow valve is connected to the second pressure reducing valve, a filter box is connected to the first electronically controlled flow valve, an aluminosilicate molecular sieve is arranged in the filter box, a fourth hose is communicated with the filter box, the end of the fourth hose away from the filter box is communicated with the air supply pipe, a first one-way valve is arranged in the fourth hose, and a flow sensor is installed in the breathing mask.

[0013] In some embodiments, the gas cylinder is filled with compressed oxygen.

[0014] In some embodiments, a partition plate is arranged in the gas cylinder. The partition plate divides the gas cylinder into two independent cavities. Compressed oxygen is arranged in the upper cavity, and a nitrogen-oxygen mixture is arranged in the lower cavity, and the ratio of oxygen to nitrogen is 21:79.

[0015] In some embodiments, a fifth hose is communicated with the upper cavity of the gas cylinder. The end of the fifth hose away from the gas cylinder is communicated with the C-shaped airbag. A second one-way valve is arranged in the fifth hose, and a second electronically controlled flow valve is arranged on the fifth hose.

[0016] In some embodiments, the gas cylinder is filled with a nitrogen-oxygen mixture, and the ratio of oxygen to nitrogen is 25:75.

[0017] The present invention has at least the following beneficial effects:

[0018] 1. Compared with traditional open-circuit oxygen breathing apparatuses, the gas exhaled by the rescuer is compressed into the C-shaped airbag under the action of the spherical compressor. The flow sensor in the breathing mask part monitors the breathing frequency of the rescuer. According to the actual activity intensity of the rescuer, under the action of the circulation mechanism, the gas in the C-shaped airbag is filtered for carbon dioxide and then supplemented into the air supply pipe, greatly extending the single rescue time of the rescuer, and the weight only increases by about 3 kg, which is much lower than that of traditional closed-circuit oxygen breathing apparatuses.

[0019] 2. The structure of this device is simple, and most parts can be directly purchased on the market, with a low cost.

[0020] 3. There are various options for this device, and enterprises can choose suitable devices for production according to their own production conditions, which is convenient for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0022] Figure 2 is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0023] Figure 3 is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0024] Figure 4 is a schematic diagram of the cross-sectional structure of Embodiment 2 of the present invention;

[0025] Figure 5 is of the present invention Figure 4 schematic diagram of the structure at A;

[0026] Figure 6 is of the present invention Figure 4 schematic diagram of the structure at B.

[0027] In the figure: 1. Backplate; 11. Gas cylinder; 12. First pressure reducing valve; 13. First hose; 14. Pressure gauge; 15. Gas supply pipe; 16. Breathing mask; 2. Shoulder strap; 21. Rotary table; 22. Braided sleeve; 3. Waist tightening belt; 4. Spherical compressor; 5. Circulation mechanism; 51. Second hose; 52. Through hole; 53. C-shaped airbag; 54. Third hose; 55. Limiting part; 551. Braided belt; 552. High-density braided mesh sleeve; 56. Compensation part; 561. Pressure valve; 562. Second pressure reducing valve; 563. First electronically controlled flow valve; 564. Filter box; 565. Aluminosilicate molecular sieve; 566. Fourth hose; 567. First check valve; 568. Flow sensor; 111. Partition board; 112. Fifth hose; 113. Second check valve; 114. Second electronically controlled flow valve. Detailed implementation mode

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention. Embodiment 1

[0029] Please refer to Figures 1 - 6 , the present invention provides a technical solution: a positive pressure fire oxygen breathing apparatus circulation gas intelligent compensation supply device, including a backplate 1 and a gas cylinder 11 installed on the backplate 1. The backplate 1 is arc-shaped and C-shaped when viewed from above. A first pressure reducing valve 12 is installed at the air outlet of the gas cylinder 11. The gas cylinder 11 is installed with a pressure gauge 14 through a first hose 13. The first pressure reducing valve 12 is connected to a breathing mask 16 through a gas supply pipe 15. It further includes:

[0030] Shoulder straps 2, the shoulder straps 2 are installed on the backplate 1, there are two, and turntables 21 are installed at one end of the shoulder straps 2 located above the backplate 1. The turntables 21 are rotatably connected to the backplate 1. Braided sleeves 22 are installed on the shoulder straps 2. The first hose 13 is located in the braided sleeve 22 on one side;

[0031] Waist tightening belt 3, the waist tightening belt 3 is installed on the backplate 1;

[0032] Spherical compressor 4, the spherical compressor 4 is installed on the backplate 1 through a bracket, and is located on the protruding side of the backplate 1;

[0033] In the field of compressors, the spherical compressor 4 is currently the only power mechanical structure that can be miniaturized and ultra-lightweight. Compared with traditional air compressors, in the application of this device, the diameter of the spherical compressor 4 can be made 5-10 cm, and the finished product weight is 2-3 kg. It is light in weight and easy to carry.

[0034] The circulation mechanism 5 is installed on the back plate 1 and is connected to the breathing mask 16 and the gas cylinder 11. The circulation mechanism 5 collects the gas exhaled by the rescuer and filters and supplements the corresponding amount of the collected gas into the air supply pipe 15 according to the intensity of the rescuer's activities.

[0035] The circulation mechanism 5 includes a second hose 51 installed on the breathing mask 16. One end of the second hose 51 is communicated with the exhaust port of the breathing mask 16, and the other end is communicated with the intake port of the spherical compressor 4. It also includes through holes 52 oppositely formed on the back plate 1. A C-shaped airbag 53 is installed in the through holes 52. A third hose 54 is communicated with the C-shaped airbag 53. One end of the third hose 54 far from the C-shaped airbag 53 is communicated with the exhaust port of the spherical compressor 4. It further includes a restricting member 55 installed on the back plate 1 and a compensating member 56 installed on the C-shaped airbag 53. The restricting member 55 is used to restrict the position and maximum deformation degree of the C-shaped airbag 53, and the compensating member 56 changes the supply amount of the gas in the air supply pipe 15 according to the breathing condition of the rescuer.

[0036] The restricting member 55 includes a woven belt 551 installed on the concave side of the back plate 1. The woven belt 551 cooperates with the back plate 1 to clamp the part of the C-shaped airbag 53 on the corresponding side of the back plate 1. A high-density woven mesh sleeve 552 is sleeved outside the C-shaped airbag 53. The woven sleeve 22, the woven belt 551, and the high-density woven mesh sleeve 552 are all made of high-temperature and wear-resistant fibers.

[0037] The compensating member 56 includes a pressure valve 561 communicated with the C-shaped airbag 53. A second pressure reducing valve 562 is connected to the pressure valve 561. A first electronically controlled flow valve 563 is connected to the second pressure reducing valve 562. A filter box 564 is connected to the first electronically controlled flow valve 563. An aluminosilicate molecular sieve 565 is arranged in the filter box 564. A fourth hose 566 is communicated with the filter box 564. One end of the fourth hose 566 far from the filter box 564 is communicated with the air supply pipe 15. A first one-way valve 567 is arranged in the fourth hose 566. A flow sensor 568 is installed in the breathing mask 16.

[0038] The gas cylinder 11 is filled with compressed oxygen.

[0039] The working principle of this embodiment is as follows: When the rescuer receives an alarm, the spherical compressor 4 is turned on at the maximum power. It should be noted that the spherical compressor 4 can also be directly connected to the fire protection system and automatically turned on while confirming the need for rescue, and operated selectively according to the actual situation of the fire department. As the spherical compressor 4 operates at the maximum power, the outside air is extracted through the exhaust port of the breathing mask 16, and the outside air is compressed into the C-shaped airbag 53 through the second hose 51 and the third hose 54. When the air pressure in the C-shaped airbag 53 is greater than the threshold value of the pressure valve 561, the pressure valve 561 will open. At the same time when the pressure valve 561 opens, the spherical compressor 4 stops working. The interlock of this part can be achieved by simple programming by those skilled in the art, such as setting the motor part of the spherical compressor 4 or the driving sources of each electronic control valve. The opening and closing timing of the subsequent components are the same and are prior art.

[0040] Under the limiting effect of the one-way valve built in the breathing mask 16, the C-shaped airbag 53 is in a high-pressure state. Subsequently, the rescuer wears this device on the body through the shoulder strap 2 and the waist fastening strap 3. After arriving at the rescue site, the breathing mask 16 is worn on the face. As the rescue work starts, the flow sensor 568 in the breathing mask 16 will count the air flow exhaled by the rescuer during each period of time at regular intervals. By default, it is counted once every 5 seconds. The rescuer can change this value according to his own physical strength and experience, and the maximum interval time does not exceed 10 seconds, so that the flow sensor 568 can timely monitor the breathing frequency of the rescuer, and then change the subsequent air supply volume. Specifically:

[0041] The spherical compressor 4 compresses the gas exhaled by the rescuer once. With the cooperation of the flow sensor 568, when the breathing frequency of the rescuer increases, the flow sensor 568 sends a signal to the spherical compressor 4, and the spherical compressor 4 speeds up the compression frequency of the gas exhaled by the rescuer. On the contrary, when the breathing frequency of the rescuer slows down, the spherical compressor 4 reduces the compression frequency of the gas exhaled by the rescuer. The gas exhaled by the rescuer enters the spherical compressor 4 from the second hose 51 and then enters the C-shaped airbag 53. The part of the C-shaped airbag 53 designed on the concave side of the back plate 1 can improve the wearing comfort of the rescuer and avoid the hard contact between the rescuer's back and the back plate 1. At the same time, when the rescuer runs or goes up and down stairs, this part of the C-shaped airbag 53 will be continuously squeezed and reset under the influence of the movement amplitude of the rescuer and the gravity of the gas cylinder 11, etc., and can also be used as an auxiliary monitoring means to monitor whether the rescuer is performing high-intensity activities;

[0042] When the C-shaped airbag 53 is in a saturated state, after the spherical compressor 4 compresses the gas exhaled by the rescuer into the C-shaped airbag 53, an equal amount of gas exhaled by the rescuer in the C-shaped airbag 53 will enter the second pressure reducing valve 562 from the pressure valve 561, and then pass through the first electronically controlled flow valve 563 and the filter box 564. The aluminosilicate molecular sieve 565 in the filter box 564 can filter the carbon dioxide in the gas exhaled by the rescuer. The filtered gas is supplemented into the air supply pipe 15 through the fourth hose 566 and the first one-way valve 567 inside it. At the same time, the first pressure reducing valve 12 of the gas cylinder 11 is opened to supplement oxygen into the air supply pipe 15, so that the oxygen content of the gas in the air supply pipe 15 is always in a state suitable for breathing, completing the supply and recovery of the gas during the rescuer's breathing process and forming a complete gas circulation system. The filtration of carbon dioxide by the aluminosilicate molecular sieve 565 is a physical reaction and does not generate heat. Compared with the traditional closed-circuit oxygen breathing apparatus, it saves the weight of the absorbent, refrigerant and the corresponding placement tank. The present invention does not require a backpack box, and in the case of similar air supply time, the overall equipment weight is reduced by 5-10 kg, reducing the burden on the rescue personnel.

[0043] It should be noted that the pressure gauge 14 is used in the same way as the existing oxygen breathing apparatus. The braided sleeve 22 on one side of the shoulder strap 2 is used to limit the position of the hose of the pressure gauge 14, and the other side is used to limit the positions of the air supply pipe 15 and the second hose 51, so as to prevent the air supply pipe 15 and the second hose 51 from swinging too much during the rescue process and hindering the rescue work. Embodiment 2

[0044] On the basis of Embodiment 1, the present invention proposes another optimization scheme for the gas cylinder 11:

[0045] A partition plate 111 is provided in the gas cylinder 11. The partition plate 111 divides the gas cylinder 11 into two independent cavities. Compressed oxygen is provided in the upper cavity, and a nitrogen-oxygen mixed gas is provided in the lower cavity, and the ratio of oxygen to nitrogen is 21:79.

[0046] The upper cavity of the gas cylinder 11 is communicated with a fifth hose 112. One end of the fifth hose 112 far from the gas cylinder 11 is communicated with the C-shaped airbag 53. A second one-way valve 113 is provided in the fifth hose 112, and a second electronically controlled flow valve 114 is provided on the fifth hose 112.

[0047] The working principle of this embodiment is as follows: When no rescue activity is carried out, the C-shaped airbag 53 is in a near-vacuum state. When the rescuer wears this device for rescue, the gas exhaled by the rescuer enters the interior of the C-shaped airbag 53 through the spherical compressor 4 in the same way as in Embodiment 1. Before the C-shaped airbag 53 is saturated, the gas source in the supply pipe 15 completely depends on the nitrogen-oxygen mixed gas in the lower cavity of the gas cylinder 11. Since no gas exhaled by the rescuer is mixed, its temperature and humidity are within a suitable range, and the comfort level is higher. The second electronically controlled flow valve 114 on the fifth hose 112 also supplements the oxygen in the upper cavity of the gas cylinder 11 into the C-shaped airbag 53 according to the data monitored by the flow sensor 568 to ensure the oxygen content of the gas in the C-shaped airbag 53. When the C-shaped airbag 53 is in a saturated state, as the rescuer continues to exhale gas, part of the gas in the C-shaped airbag 53 will be discharged from the pressure valve 561, and finally, after filtering carbon dioxide, it enters the supply pipe 15. After being mixed with the gas in the gas cylinder 11, it supplies gas to the rescuer. This embodiment has a higher comfort level during use. Embodiment 3

[0048] Based on Embodiment 1 of the present invention, another optimization scheme is proposed for the gas cylinder 11:

[0049] The gas cylinder 11 is filled with a nitrogen-oxygen mixed gas, and the ratio of oxygen to nitrogen is 25:75.

[0050] The working principle of this embodiment is as follows: When no rescue activity is carried out, the C-shaped airbag 53 is in a near-vacuum state. When the rescuer wears this device for rescue, the gas exhaled by the rescuer enters the interior of the C-shaped airbag 53 through the spherical compressor 4 in the same way as in Embodiment 1. Before the C-shaped airbag 53 is saturated, the gas source in the supply pipe 15 completely depends on the nitrogen-oxygen mixed gas in the lower cavity of the gas cylinder 11. The oxygen content in the air in the atmosphere is 21%, and the oxygen content of the gas provided in this embodiment is 25%. Science shows that in an oxygen-rich environment, the activity of immune cells can be improved, and the metabolic level and vitality of the human body can be enhanced, which plays a positive role in the high-intensity rescue activities of the rescuer and can enable the rescuer to quickly enter the rescue state. At the same time, when a disaster occurs, the early response work is particularly important. Before the C-shaped airbag 53 is saturated, the oxygen-rich gas can assist in improving the early rescue efficiency of the rescuer. When the C-shaped airbag 53 is in a saturated state, as the rescuer continues to exhale gas, part of the gas in the C-shaped airbag 53 will be discharged from the pressure valve 561, and finally, after filtering carbon dioxide, it enters the supply pipe 15. The oxygen content of the filtered gas is about 16%. The oxygen content of the gas mixed with the oxygen-rich gas discharged from the gas cylinder 11 is close to the air in the atmosphere, avoiding discomfort caused by some rescuers being in an oxygen-rich state for a long time.

[0051] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0052] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positive pressure fire fighting oxygen breathing apparatus circulating gas intelligent compensation supply device, comprising a backplate (1) and a gas cylinder (11) installed on the backplate (1), the backplate (1) is arc-shaped, and is C-shaped when viewed from above. A first pressure reducing valve (12) is installed at the air outlet of the gas cylinder (11). A pressure gauge (14) is installed on the gas cylinder (11) through a first hose (13). The first pressure reducing valve (12) is connected to a breathing mask (16) through an air supply pipe (15), and is characterized in that: Further included are: Shoulder straps (2), two in number, which are mounted on the backplate (1). One ends of the shoulder straps (2) located above the backplate (1) are each mounted with a turntable (21). The turntable (21) is rotatably connected to the backplate (1). Braided sleeves (22) are mounted on the shoulder straps (2), and the first hose (13) is located within the braided sleeve (22) on one side; A waist tightening strap (3), which is mounted on the backplate (1); A spherical compressor (4), which is mounted on the backplate (1) by a bracket and is located on the protruding side of the backplate (1); A circulation mechanism (5), which is mounted on the backplate (1) and is connected to the breathing mask (16) and the gas cylinder (11). The circulation mechanism (5) collects the gas exhaled by the rescuer and filters and supplements the corresponding amount of the collected gas to the supply pipe (15) according to the activity intensity of the rescuer; The circulation mechanism (5) includes a second hose (51) mounted on the breathing mask (16). One end of the second hose (51) is communicated with the exhaust port of the breathing mask (16), and the other end is communicated with the intake port of the spherical compressor (4). It also includes through holes (52) oppositely formed on the backplate (1). A C-shaped airbag (53) is mounted within the through hole (52). A third hose (54) is communicated with the C-shaped airbag (53). One end of the third hose (54) away from the C-shaped airbag (53) is communicated with the exhaust port of the spherical compressor (4). It further includes a limiting member (55) mounted on the backplate (1) and a compensating member (56) mounted on the C-shaped airbag (53). The limiting member (55) is used to limit the position and maximum deformation degree of the C-shaped airbag (53), and the compensating member (56) changes the supply amount of the gas in the supply pipe (15) according to the breathing condition of the rescuer; The limiting member (55) includes a braided belt (551) mounted on the concave side of the backplate (1). The braided belt (551) cooperates with the backplate (1) to clamp the part of the C-shaped airbag (53) located on the corresponding side of the backplate (1). A high-density braided mesh sleeve (552) is sleeved around the C-shaped airbag (53). The braided sleeve (22), the braided belt (551), and the high-density braided mesh sleeve (552) are all composed of high-temperature and wear-resistant fibers; The compensating member (56) includes a pressure valve (561) connected to the C-shaped airbag (53). A second pressure reducing valve (562) is connected to the pressure valve (561). A first electronically controlled flow valve (563) is connected to the second pressure reducing valve (562). A filter box (564) is connected to the first electronically controlled flow valve (563). An aluminosilicate molecular sieve (565) is provided in the filter box (564). A fourth hose (566) is connected to the filter box (564). One end of the fourth hose (566) away from the filter box (564) is connected to the air supply pipe (15). A first one-way valve (567) is provided in the fourth hose (566). A flow sensor (568) is installed in the breathing mask (16).

2. The intelligent compensation supply device for the circulating gas of a positive pressure fire-fighting oxygen breathing apparatus according to claim 1, wherein: The gas cylinder (11) is filled with compressed oxygen.

3. The intelligent compensation supply device for circulating gas of a positive pressure fire-fighting oxygen breathing apparatus according to claim 1, wherein: A partition plate (111) is provided in the gas cylinder (11). The partition plate (111) divides the gas cylinder (11) into two independent cavities. Compressed oxygen is provided in the upper cavity, and a nitrogen-oxygen mixture is provided in the lower cavity, and the ratio of oxygen to nitrogen is 21:

79.

4. The intelligent compensation supply device for the circulating gas of a positive pressure fire-fighting oxygen breathing apparatus according to claim 3, characterized in that: The upper cavity of the gas cylinder (11) is connected to a fifth hose (112). One end of the fifth hose (112) away from the gas cylinder (11) is connected to the C-shaped airbag (53). A second one-way valve (113) is provided in the fifth hose (112). A second electronically controlled flow valve (114) is provided on the fifth hose (112).

5. The intelligent compensation supply device for the circulating gas of a positive pressure fire-fighting oxygen breathing apparatus according to claim 1, characterized in that: The gas cylinder (11) is filled with a nitrogen-oxygen mixture, and the ratio of oxygen to nitrogen is 25:75.

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