Intelligent circulating gas compensation and supply device for positive pressure type fire-fighting oxygen respirator

Abstract

The invention relates to the technical field of fire rescue equipment, in particular to a positive pressure type fire-fighting oxygen respirator circulating gas intelligent compensation supply device which comprises a back plate and a gas cylinder installed on the back plate, the back plate is in an arc shape and is in a C shape when overlooked, a first pressure reducing valve is installed at a gas outlet, and a pressure gauge is installed on the first pressure reducing valve through a first hose. Compared with a traditional open-circuit type oxygen respirator, gas exhaled by a rescuer is compressed into a C-shaped air bag under the action of a spherical compressor, a flow sensor of the breathing mask part monitors the breathing frequency of the rescuer, and the breathing mask is used for controlling the breathing frequency of the rescuer according to the actual activity intensity of the rescuer. Under the action of the circulation mechanism, gas in the C-shaped air bag is supplemented into the gas supply pipe after carbon dioxide is filtered, the time of one-time rescue of a rescuer is greatly prolonged, and the weight is only increased by about 3 kg and is far lower than that of a traditional closed-circuit type oxygen respirator.

Description

Technical Field

[0001] The invention relates to the technical field of firefighting and rescue equipment, and in particular to a positive pressure firefighting oxygen breathing apparatus circulating gas intelligent compensation supply device. Background Art

[0002] Fire rescue oxygen respirators on the market are mainly divided into two categories: closed-circuit and open-circuit. Closed-circuit respirators use a sophisticated system to efficiently filter and cool the exhaled gas of rescuers, and replenish fresh oxygen in time to maintain circulation. This mechanism significantly extends the oxygen supply time and is particularly suitable for large and complex fire scene operations. However, in order to achieve the above high performance, closed-circuit respirators need to be equipped with a series of auxiliary devices, including cleaning tanks filled with absorbents such as calcium hydroxide, coolers with built-in water ice or blue ice, and backpacks for stabilizing internal components. In addition to the weight of the oxygen cylinder, the overall weight often exceeds 20kg, which poses a severe challenge to the physical fitness of rescuers.

[0003] In contrast, the open-circuit respirator has a simpler structure, mainly consisting of a high-pressure gas cylinder (filled with an oxygen-nitrogen mixture), a lightweight backboard fixing system and a breathing mask. When a 6.8L oxygen cylinder is used, the overall weight is controlled at about 10kg, which is only half of the closed-circuit type, and it is easy and quick to wear. Unfortunately, the open-circuit respirator releases exhaled gas directly into the environment, and the oxygen supply of the rescuers is completely dependent on the limited gas cylinder capacity, which limits the duration of a single rescue.

[0004] In summary, existing oxygen respirators have their own limitations and are limited in their applicable scenarios. After unremitting efforts and repeated experiments by industry experts, we have proposed a positive pressure fire-fighting oxygen respirator circulating gas intelligent compensation supply device with strong comprehensive capabilities and a wide range of applicable scenarios. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a positive pressure fire-fighting oxygen breathing apparatus circulating gas intelligent compensation supply device, comprising a back plate and a gas cylinder installed on the back plate, the back plate 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 gas supply pipe, and further comprises: A shoulder strap, wherein the shoulder strap is mounted on the back plate, and there are two shoulder straps, and a rotating disk is mounted on one end of each shoulder strap located above the back plate, and the rotating disk is rotatably connected to the back plate, and a braided sleeve is mounted on each shoulder strap, and the first hose is located in the braided sleeve on one side; A waist fastening belt mounted on the back panel; A spherical compressor, which is mounted on the back plate through a bracket and is located on a protruding side of the back plate; The circulation mechanism is installed on the back plate and connected to the breathing mask and the gas cylinder. The circulation mechanism collects the gas exhaled by the rescuer, and according to the rescuer's intense activity state, a corresponding amount of the collected gas is filtered and then supplemented into the gas supply pipe.

[0006] In some embodiments, the circulation mechanism includes a second hose installed on the breathing mask, one end of the second hose is connected to the exhaust port of the breathing mask, and the other end is connected to the air inlet of the spherical compressor. It also includes through holes opened relatively on the back plate, a C-shaped air bag is installed in the through holes, a third hose is connected to the C-shaped air bag, and one end of the third hose away from the C-shaped air bag is connected to the exhaust port of the spherical compressor. It also includes a limiting part installed on the back plate and a compensating part installed on the C-shaped air bag, the limiting part is used to limit the position and maximum deformation degree of the C-shaped air bag, and the compensating part changes the supply amount of gas in the air supply pipe according to the breathing condition of the rescuer.

[0007] In some embodiments, the limiting member includes a woven belt installed on the recessed side of the back plate, and the woven belt cooperates with the back plate to clamp the part of the C-shaped airbag located on the corresponding side of the back plate. The outer cover of the C-shaped airbag is provided with a high-density woven mesh cover, and the woven cover, woven belt, and high-density woven mesh cover are all made of high-temperature resistant and wear-resistant fibers.

[0008] In some embodiments, the compensation component includes a pressure valve connected to the C-shaped airbag, the pressure valve is connected to a second pressure reducing valve, the second pressure reducing valve is connected to a first electrically controlled flow valve, the first electrically controlled flow valve is connected to a filter box, the filter box is provided with an aluminosilicate molecular sieve, the filter box is connected to a fourth hose, the end of the fourth hose away from the filter box is connected to the air supply pipe, the fourth hose is provided with a first one-way valve, and a flow sensor is installed in the breathing mask.

[0009] In some embodiments, the gas cylinder is filled with compressed oxygen.

[0010] In some embodiments, a partition is provided in the gas cylinder, and the partition divides the gas cylinder into two independent chambers. Compressed oxygen is provided in the upper chamber, and nitrogen-oxygen mixed gas is provided in the lower chamber, and the ratio of oxygen to nitrogen is 21:79.

[0011] In some embodiments, the cavity above the gas cylinder is connected to a fifth hose, the end of the fifth hose away from the gas cylinder is connected to the C-shaped airbag, a second one-way valve is arranged in the fifth hose, and a second electrically controlled flow valve is arranged on the fifth hose.

[0012] In some embodiments, the gas cylinder is filled with a nitrogen-oxygen mixed gas, and the ratio of oxygen to nitrogen is 25:75.

[0013] The present invention has at least the following beneficial effects: 1. Compared with the traditional open-circuit oxygen respirator, the gas exhaled by the rescuer is compressed into the C-shaped airbag by the spherical compressor. The flow sensor of the breathing mask monitors the rescuer's breathing frequency. According to the rescuer's actual activity intensity, under the action of the circulation mechanism, the gas in the C-shaped airbag is supplemented into the air supply pipe after being filtered by carbon dioxide, which greatly prolongs the rescuer's single rescue time. The weight is only increased by about 3kg, which is much lower than the traditional closed-circuit oxygen respirator.

[0014] 2. The equipment has a simple structure, and most of its parts can be purchased directly on the market at a low cost.

[0015] 3. This equipment has multiple options. Enterprises can choose appropriate equipment for production according to their own production conditions, which is convenient for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of Example 2 of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the structure at A in the middle; Figure 6 For the present invention Figure 4 Schematic diagram of the structure at point B in the middle.

[0017] In the figure: 1, back plate; 11, gas cylinder; 12, first pressure reducing valve; 13, first hose; 14, pressure gauge; 15, air supply pipe; 16, breathing mask; 2, shoulder strap; 21, turntable; 22, braided sleeve; 3, waist tightening belt; 4, spherical compressor; 5, circulation mechanism; 51, second hose; 52, through hole; 53, C-shaped air bag; 54, third hose; 55, restriction; 551, braided belt; 552, high-density braided mesh sleeve; 56, compensation part; 561, pressure valve; 562, second pressure reducing valve; 563, first electric control flow valve; 564, filter box; 565, aluminosilicate molecular sieve; 566, fourth hose; 567, first one-way valve; 568, flow sensor; 111, partition plate; 112, fifth hose; 113, second one-way valve; 114, second electric control flow valve. DETAILED DESCRIPTION

[0018] 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. Example 1

[0019] See also Figure 1-Figure 6 The present invention provides a technical solution: a positive pressure fire-fighting oxygen breathing apparatus circulating gas intelligent compensation supply device, comprising a back plate 1 and a gas cylinder 11 installed on the back plate 1, the back plate 1 is arc-shaped, and is C-shaped when viewed from above, a first pressure reducing valve 12 is installed at the gas outlet of the gas cylinder 11, a pressure gauge 14 is installed on the gas cylinder 11 through a first hose 13, and the first pressure reducing valve 12 is connected to a breathing mask 16 through a gas supply pipe 15, and also includes: The shoulder straps 2 are mounted on the back plate 1. There are two shoulder straps 2, and a turntable 21 is mounted on one end of the shoulder straps 2 located above the back plate 1. The turntable 21 is rotatably connected to the back plate 1. A braided sleeve 22 is mounted on the shoulder straps 2. The first hose 13 is located in the braided sleeve 22 on one side. A waist fastening belt 3, which is mounted on the back plate 1; A spherical compressor 4 is mounted on the back plate 1 through a bracket and is located on a protruding side of the back plate 1; In the field of compressors, the spherical compressor 4 is currently the only ultra-micro and ultra-lightweight power mechanical structure. Compared with traditional air compressors, in the application of this equipment, the diameter of the spherical compressor 4 can be 5-10CM, and the finished product weight is 2-3kg, which is light and easy to carry.

[0020] The circulation mechanism 5 is installed on the back plate 1 and connected to the breathing mask 16 and the gas cylinder 11. The circulation mechanism 5 collects the gas exhaled by the rescuer, and filters a corresponding amount of the collected gas according to the rescuer's intense activity state and then supplements it into the gas supply pipe 15.

[0021] The circulation mechanism 5 includes a second hose 51 installed on the breathing mask 16, one end of the second hose 51 is connected to the exhaust port of the breathing mask 16, and the other end is connected to the air inlet of the spherical compressor 4. It also includes a through hole 52 opened relatively on the back plate 1, a C-shaped air bag 53 is installed in the through hole 52, and a third hose 54 is connected to the C-shaped air bag 53. The end of the third hose 54 away from the C-shaped air bag 53 is connected to the exhaust port of the spherical compressor 4. It also includes a limiting member 55 installed on the back plate 1 and a compensating member 56 installed on the C-shaped air bag 53. The limiting member 55 is used to limit the position and maximum deformation degree of the C-shaped air bag 53, and the compensating member 56 changes the supply amount of gas in the air supply pipe 15 according to the breathing condition of the rescuer.

[0022] The limiting member 55 includes a woven belt 551 installed on the recessed side of the back plate 1. The woven belt 551 cooperates with the back plate 1 to clamp the portion of the C-shaped airbag 53 located on the corresponding side of the back plate 1. The outer cover of the C-shaped airbag 53 is provided with a high-density woven mesh sleeve 552. The woven sleeve 22, the woven belt 551, and the high-density woven mesh sleeve 552 are all made of high-temperature resistant and wear-resistant fibers.

[0023] The compensation component 56 includes a pressure valve 561 connected to the C-shaped airbag 53, the pressure valve 561 is connected to a second pressure reducing valve 562, the second pressure reducing valve 562 is connected to a first electrically controlled flow valve 563, the first electrically controlled flow valve 563 is connected to a filter box 564, the filter box 564 is provided with an aluminosilicate molecular sieve 565, the filter box 564 is connected to a fourth hose 566, the end of the fourth hose 566 away from the filter box 564 is connected to the air supply pipe 15, the fourth hose 566 is provided with a first one-way valve 567, and a flow sensor 568 is installed in the breathing mask 16.

[0024] The gas cylinder 11 is filled with compressed oxygen.

[0025] The working principle of this embodiment is as follows: when the rescuer receives the alarm, he turns on the spherical compressor 4 at maximum power. It should be noted that the spherical compressor 4 can also be directly connected to the fire-fighting system, and automatically turns on when it is confirmed that rescue is needed. It is selectively operated according to the actual situation of the fire-fighting unit. As the spherical compressor 4 runs at 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. After the air pressure in the C-shaped airbag 53 is greater than the threshold of the pressure valve 561, the pressure valve 561 will open. When the pressure valve 561 is opened, the spherical compressor 4 stops working. The linkage 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 source of each electrically controlled valve, and the subsequent opening and closing timing of each component is similar, which is the prior art.

[0026] Under the restriction of the one-way valve of the breathing mask 16, the C-shaped airbag 53 is in a high-pressure state. Then the rescuer wears the device on his body through the shoulder strap 2 and the waist fastening belt 3. After arriving at the rescue site, the breathing mask 16 is worn on the face. As the rescue work begins, the flow sensor 568 in the breathing mask 16 will count the air flow exhaled by the rescuer during the time period at regular intervals. The default interval is 5 seconds. The rescuer can change this value according to his own physical strength and experience. The maximum interval time does not exceed 10 seconds, so that the flow sensor 568 can timely monitor the rescuer's breathing frequency, thereby changing the subsequent air supply, specifically: The spherical compressor 4 compresses the gas exhaled by the rescuer once. With the cooperation of the flow sensor 568, when the rescuer's breathing frequency increases, the flow sensor 568 sends a signal to the spherical compressor 4, and the spherical compressor 4 increases the frequency of compressing the rescuer's exhaled gas. On the contrary, when the rescuer's breathing frequency slows down, the spherical compressor 4 reduces the frequency of compressing the rescuer's exhaled gas. The rescuer's exhaled gas enters the spherical compressor 4 from the second hose 51, and then enters the C-shaped airbag 53. The C-shaped airbag 53 is designed on the concave side of the back plate 1 to improve the comfort of the rescuer's wearing and avoid the hard contact between the rescuer's back and the back plate 1. At the same time, when the rescuer is running or going up and down stairs, this part of the C-shaped airbag 53 will be continuously squeezed and reset under the influence of the rescuer's movement range and the gravity of the gas cylinder 11, and can also be used as an auxiliary monitoring means to monitor whether the rescuer is performing high-intensity activities. When the C-shaped airbag 53 is in a saturated state, after the spherical compressor 4 compresses the rescuer's exhaled gas into the C-shaped airbag 53, an equal amount of gas exhaled by the rescuer in the C-shaped airbag 53 enters the second pressure reducing valve 562 from the pressure valve 561, and then passes through the first electrically 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 rescuer's exhaled gas, and the filtered gas is replenished 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 one-way valve 567 of the gas cylinder 11 is used to filter the carbon dioxide in the rescuer's exhaled gas. The pressure reducing valve 12 is opened to add oxygen to 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 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 respirator, the weight of the absorbent, refrigerant and the corresponding placement tank is saved. The present invention does not require a backpack. When the gas supply time is close, the weight of the overall equipment is reduced by 5-10kg, reducing the burden on rescuers.

[0027] It should be noted that the use of the pressure gauge 14 is the same as that of the existing oxygen respirator. 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 position of the air supply pipe 15 and the second hose 51 to prevent the air supply pipe 15 and the second hose 51 from swinging too much during the rescue process, thereby hindering the rescue work. Example 2

[0028] Based on Example 1, the present invention proposes another optimization solution for the gas cylinder 11: A partition plate 111 is provided in the gas cylinder 11, and the partition plate 111 divides the gas cylinder 11 into two independent cavities. Compressed oxygen is provided in the upper cavity, and nitrogen-oxygen mixed gas is provided in the lower cavity, and the ratio of oxygen to nitrogen is 21:79.

[0029] The cavity above 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 arranged in the fifth hose 112 , and a second electrically controlled flow valve 114 is arranged on the fifth hose 112 .

[0030] The working principle of this embodiment is as follows: when no rescue activities are carried out, the C-shaped airbag 53 is in a state close to vacuum. When the rescuer wears the device for rescue, the gas exhaled by the rescuer enters the C-shaped airbag 53 in the same way as in the first embodiment through the spherical compressor 4. Before the C-shaped airbag 53 is saturated, the gas source in the air supply pipe 15 is completely dependent on the nitrogen-oxygen mixed gas in the cavity below the gas cylinder 11. Since the gas exhaled by the rescuer is not mixed, the temperature and humidity are in a suitable range, which is more comfortable. The fifth hose 112 The second electrically controlled flow valve 114 also replenishes the oxygen in the cavity above the gas cylinder 11 into the C-shaped airbag 53 based on the data monitored by the flow sensor 568, ensuring 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 enter the gas supply pipe 15 after filtering the carbon dioxide, and after mixing with the gas in the gas cylinder 11, supply gas to the rescuer. This embodiment is more comfortable during use. Example 3

[0031] Based on Example 1, the present invention proposes another optimization solution for the gas cylinder 11: The gas cylinder 11 is filled with a nitrogen-oxygen mixed gas, and the ratio of oxygen to nitrogen is 25:75.

[0032] The working principle of this embodiment is as follows: when no rescue activities are carried out, the C-shaped airbag 53 is in a state close to vacuum. When the rescuer wears the device for rescue, the gas exhaled by the rescuer enters 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 source of gas in the air supply pipe 15 is completely dependent on the nitrogen-oxygen mixed gas in the cavity below the gas cylinder 11. The oxygen content of 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, the metabolic level and vitality of the human body can be improved, and the high-intensity rescue of the rescuer can be improved. The activity plays a positive role in enabling rescuers 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 rescue efficiency of the rescuers in the early stage. 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 enter the air supply pipe 15 after filtering the carbon dioxide. The oxygen content of the filtered gas is about 16%, and the oxygen content of the gas mixed with the oxygen-rich gas discharged from the gas cylinder 11 is close to that of the air in the atmosphere, which avoids some rescuers from being in an oxygen-rich state for a long time and causing discomfort.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 back plate (1) and a gas cylinder (11) mounted on the back plate (1), the back plate (1) being arc-shaped and C-shaped when viewed from above, a first pressure reducing valve (12) being installed at the gas outlet of the gas cylinder (11), a pressure gauge (14) being installed on the gas cylinder (11) via a first hose (13), the first pressure reducing valve (12) being connected to a breathing mask (16) via a gas supply pipe (15), characterized in that: Also includes: A shoulder strap (2), the shoulder strap (2) being mounted on the back plate (1), the shoulder strap (2) being two in number, and each of the ends located above the back plate (1) being mounted with a rotating disk (21), the rotating disk (21) being rotatably connected to the back plate (1), the shoulder strap (2) being mounted with a braided sleeve (22), the first hose (13) being located in the braided sleeve (22) on one side; A waist fastening belt (3), wherein the waist fastening belt (3) is mounted on the back plate (1); a spherical compressor (4), the spherical compressor (4) being mounted on the back plate (1) via a bracket and being located on a protruding side of the back plate (1); A circulation mechanism (5) is mounted on the back plate (1) and connected to the breathing mask (16) and the gas cylinder (11). The circulation mechanism (5) collects gas exhaled by the rescuer and filters a corresponding amount of the collected gas according to the rescuer's intense activity state before replenishing it into the gas supply pipe (15).

2. According to claim 1, a positive pressure fire-fighting oxygen breathing apparatus circulating gas intelligent compensation supply device is characterized in that: The circulation mechanism (5) comprises a second hose (51) mounted on the breathing mask (16), one end of the second hose (51) being connected to the exhaust port of the breathing mask (16), and the other end being connected to the air inlet of the spherical compressor (4), and further comprising through holes (52) oppositely opened on the back plate (1), a C-shaped air bag (53) being mounted in the through holes (52), a third hose (54) being connected to the C-shaped air bag (53), one end of the third hose (54) being away from the C-shaped air bag (53) being connected to the exhaust port of the spherical compressor (4), and further comprising a limiting member (55) mounted on the back plate (1) and a compensating member (56) mounted on the C-shaped air bag (53), the limiting member (55) being used to limit the position and maximum deformation degree of the C-shaped air bag (53), and the compensating member (56) changing the supply amount of gas in the air supply pipe (15) according to the breathing condition of the rescuer.

3. According to claim 2, a positive pressure fire-fighting oxygen breathing apparatus circulating gas intelligent compensation supply device is characterized in that: The limiting member (55) comprises a braided belt (551) mounted on one side of the recess of the back plate (1); the braided belt (551) cooperates with the back plate (1) to clamp the portion of the C-shaped airbag (53) located on the corresponding side of the back plate (1); a high-density braided mesh sleeve (552) is provided on the outer periphery of the C-shaped airbag (53); the braided sleeve (22), the braided belt (551) and the high-density braided mesh sleeve (552) are all made of high-temperature resistant and wear-resistant fibers.

4. The intelligent compensation supply device for circulating gas of a positive pressure fire-fighting oxygen breathing apparatus according to claim 3 is characterized in that: The compensating member (56) comprises a pressure valve (561) connected to the C-shaped airbag (53); the pressure valve (561) is connected to a second pressure reducing valve (562); the second pressure reducing valve (562) is connected to a first electrically controlled flow valve (563); the first electrically controlled flow valve (563) is connected to a filter box (564); an aluminosilicate molecular sieve (565) is arranged in the filter box (564); a fourth hose (566) is connected to the filter box (564); an 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 arranged in the fourth hose (566); and a flow sensor (568) is installed in the breathing mask (16).

5. The intelligent compensation supply device for circulating gas of a positive pressure fire-fighting oxygen breathing apparatus according to claim 4 is characterized in that: The gas cylinder (11) is filled with compressed oxygen.

6. The intelligent compensation supply device for circulating gas of a positive pressure fire-fighting oxygen breathing apparatus according to claim 2, characterized in that: The gas cylinder (11) is provided with a partition plate (111), and the partition plate (111) divides the gas cylinder (11) into two independent chambers, wherein compressed oxygen is provided in the upper chamber, and nitrogen-oxygen mixed gas is provided in the lower chamber, and the ratio of oxygen to nitrogen is 21:

79.

7. The intelligent compensation supply device for circulating gas of a positive pressure fire-fighting oxygen breathing apparatus according to claim 6 is characterized in that: The cavity located above 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 a C-shaped airbag (53); a second one-way valve (113) is arranged in the fifth hose (112); and a second electrically controlled flow valve (114) is arranged on the fifth hose (112).

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

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