A bottom-connected positive pressure fire-fighting oxygen respirator with improved wearing comfort

Abstract

The present invention relates to the technical field of emergency equipment, and specifically to a bottom-connected positive-pressure fire-fighting oxygen respirator with improved wearing comfort, comprising a respirator body, a shoulder strap and a waist tightening belt arranged on the respirator body, the respirator body is provided with a limit rod, the limit rods are provided with a gas box, the gas box is divided into three parts, namely, a gas supply chamber, an absorption chamber and a recovery chamber, with the limit rod as a boundary, the exhalation hose and the inhalation hose in the device are arranged in a bottom-connected manner, when rescuers are rescuing a comatose person, the rescuers do not need to worry about the comatose person causing compression to the exhalation hose or the inhalation hose, the rescuers can carry the patient on their shoulders in a more rapid manner in a suitable posture, thereby improving the efficiency of the rescue; under the monitoring of a temperature sensor and a flow sensor, a refrigerator can cool down the inside of the gas supply chamber according to the temperature in the gas supply chamber and the breathing frequency of the rescuers, thereby improving the comfort of the rescuers during the rescue process.

Description

Technical Field

[0001] The invention relates to the technical field of emergency equipment, in particular to a bottom-connected positive-pressure fire-fighting oxygen respirator with improved wearing comfort. Background Art

[0002] Oxygen respirators are essential life support equipment for rescuers when performing rescue missions. A firefighting oxygen respirator design that is widely available on the market is characterized by being equipped with an inhalation hose and an exhalation hose, which are usually placed on the left and right shoulders of the rescuer. This design can still meet the needs in conventional rescue scenarios, but it exposes a series of problems when dealing with unconscious trapped people.

[0003] Specifically, when rescuers need to carry an unconscious trapped person on their shoulders, the weight of the unconscious person may inadvertently compress one of the hoses. Whether it is the inhalation hose or the exhalation hose, once compressed, it will seriously hinder the normal oxygen circulation of the oxygen respirator. This situation not only increases the difficulty of operation for rescuers, but is also likely to endanger the lives of rescuers and unconscious persons, because the interruption or poor oxygen supply will directly lead to a rapid decline in physical strength and life-threatening dangers. In order to avoid this situation, rescuers have to interrupt the transportation and adjust the body position of the unconscious person to ensure that the hose is not compressed. However, such adjustments are often time-consuming and labor-intensive, and it is difficult to ensure that rescuers can maintain a safe and comfortable state, which greatly reduces the efficiency of rescue.

[0004] In addition, existing oxygen respirators generally use calcium hydroxide as an absorbent when dealing with carbon dioxide in exhaled gas. Calcium hydroxide releases heat in the process of absorbing carbon dioxide, and the hot air exhaled by rescuers during intense work may cause the gas temperature in the inhalation hose to rise rapidly to above 50°C. High-temperature gas poses a potential threat to the respiratory system of rescuers, so it is particularly important to cool the gas in the circulation process. However, the cooling methods currently used, such as ordinary ice cubes or chemical blue ice, must be pre-treated by refrigeration equipment before rescue and installed on the oxygen respirator. This approach is not only cumbersome to operate, but also has risks: directly placing the oxygen respirator in a refrigeration environment may damage its internal electronic components, affect the normal function of the equipment, and thus reduce the rescue efficiency. At the same time, in the early stage of the rescue, since the rescuers' breathing is relatively slow, the use of these cooling methods may cause the inhaled gas temperature to be too low, causing discomfort to the rescuers.

[0005] Finally, the weight of traditional oxygen respirators cannot be ignored. They usually weigh between 10 and 20 kilograms. As the rescue time increases, this weight poses a huge challenge to the physical strength of rescuers. Long-term weight-bearing operations not only accelerate the consumption of physical strength, but may also affect the judgment and operating accuracy of rescuers, posing a potential threat to the successful completion of the rescue mission.

[0006] In summary, the existing fire-fighting oxygen respirators have many design deficiencies, especially in handling the transportation of unconscious persons, cooling of high-temperature gases and equipment weight. Therefore, we propose a bottom-connected positive-pressure fire-fighting oxygen respirator that improves wearing comfort. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a bottom-connected positive pressure fire-fighting oxygen respirator with improved wearing comfort, comprising a respirator body, a shoulder strap and a waist tightening belt arranged on the respirator body, the respirator body is equipped with a limit rod, the limit rods are multiple, a gas box is installed on the limit rod, the gas box is divided into three parts with the limit rod as the boundary, namely, an air supply chamber located in the upper part, an absorption chamber located in the middle part and a recovery chamber located in the lower part, one side of the air supply chamber and the absorption chamber is composed of a rubber sheet, and further comprises:

[0008] A breathing mask, wherein the breathing mask is connected with a Y-shaped tube, the two sides of the apex of the Y-shaped tube are respectively connected with the two sides of the breathing mask, and a one-way valve is provided at each connection point, and a partition bar is installed inside a section of the Y-shaped tube away from the breathing mask, and the partition bar divides the part connected with the Y-shaped tube into two parts, one part is an inhalation channel, and the other part is an exhalation channel;

[0009] An exhalation hose, the end surface of which is semicircular, one end of which is connected to the exhalation channel, and the other end of which passes through the lower part of the respirator body and is connected to the recovery chamber;

[0010] An inhalation hose, the inhalation hose and the exhalation hose have the same shape and are fixedly connected to form a circular tube with a partition in the middle, one end of the inhalation hose is connected to the inhalation channel, and the other end is connected to the air supply cavity;

[0011] An absorption mechanism, which is installed in the absorption chamber and absorbs carbon dioxide in the gas entering the gas supply chamber from the recovery chamber;

[0012] The monitoring oxygen supply mechanism is installed inside the respirator body and injects corresponding oxygen into the air supply cavity according to the frequency of exhaled and inhaled gas by the rescuer and the temperature in the air supply cavity.

[0013] In some embodiments, the absorption mechanism includes a hole one opened in the absorption chamber part of the gas box, a card slot is opened on the hole one, a sealing cover is rotatably installed at one end of the hole one, a card block is installed on the sealing cover, the card block and the card slot are engaged with each other, a containing box is installed in the recovery chamber, through holes are opened on both sides of the containing box that are in contact with the air supply chamber and the recovery chamber respectively, there are several through holes, and they are evenly distributed, calcium hydroxide particles and desiccant particles are placed in the containing box, and the calcium hydroxide particles and desiccant particles are wrapped in a net bag.

[0014] In some embodiments, the oxygen supply monitoring mechanism includes an oxygen cylinder installed in the respirator body, and also includes a pressure reducer installed at the outlet end of the oxygen cylinder, the pressure reducer is connected to an electrically controlled flow valve, the electrically controlled flow valve is connected to an air supply cavity through a pipeline, a temperature sensor is installed in the air supply cavity, a flow sensor is installed in the breathing mask, and the flow sensor and the temperature sensor are electrically connected.

[0015] In some embodiments, a monitoring and cooling mechanism is installed in the respirator body, and the monitoring and cooling mechanism is used to cool the gas in the air supply cavity, including a refrigerator installed in the respirator body, the refrigerator is a semiconductor refrigeration type, and a heat pipe is installed on the refrigerator, one end of the heat pipe is connected to the left side of the refrigerator, and the other end passes through the top and one side of the air supply cavity and is connected to the right side of the refrigerator. The heat pipe located in the air supply cavity is spiral, and an air pump is installed on part of the heat pipe located on one side of the refrigerator, and the air pump is electrically connected to the temperature sensor.

[0016] In some embodiments, an air compressor is installed in the recovery chamber, and an air outlet of the air compressor is connected to the outside world, so as to compress the excess gas in the recovery chamber and discharge it to the outside world.

[0017] In some embodiments, a load-reducing mechanism is installed on the respirator body, which is connected to the air compressor and is used to use the high-pressure gas discharged by the air compressor as power to provide an upward force to the respirator body, including a strip rod installed at the air outlet of the air compressor, an exhaust hole is opened in the strip rod, a circular hole is opened on the strip rod, the circular hole is connected to the exhaust hole, and the center of the circle is far away from the exhaust hole, and multiple circular holes are provided, each of which has a first turbine installed in it, and a second turbine is installed on the first turbine through a fixed shaft, and a protective cover is installed on the strip rod, which surrounds the second turbine, and an isolation net is installed on the protective cover.

[0018] In some embodiments, a Velcro is provided on one side of the shoulder strap, and the Velcro fixes the inhalation hose and the exhalation hose to the shoulder strap.

[0019] In some embodiments, a pressure sensor is installed in the recovery chamber, and the pressure sensor is electrically connected to the air compressor.

[0020] The present invention has at least the following beneficial effects:

[0021] 1. The exhalation hose and the inhalation hose in this device are arranged in a bottom-connected manner. When the rescuers are rescuing the unconscious person, they do not need to worry about the unconscious person causing compression on the exhalation hose or the inhalation hose. The rescuers can carry the patient on their shoulders in a more appropriate posture more quickly, thereby improving the efficiency of the rescue;

[0022] 2. Under the monitoring of the temperature sensor and flow sensor, the refrigerator can cool down the gas in the air supply cavity according to the temperature in the air supply cavity and the breathing frequency of the rescuers, thereby improving the comfort of the rescuers during the rescue process;

[0023] 3. Under the action of the load-reducing mechanism, part of the gas exhaled by the rescuers is utilized and provides an upward force to the main body of the respirator, thus reducing the burden on the rescuers during the rescue process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of a partial cross-sectional structure of the present invention;

[0026] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in the middle;

[0027] Figure 4 It is a schematic diagram of the internal structure of the main body of the respirator of the present invention;

[0028] Figure 5 It is a schematic diagram of the internal cross-sectional structure of the main body of the respirator of the present invention;

[0029] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at B in the middle;

[0030] Figure 7 This is a schematic diagram of the structure of the oxygen supply monitoring mechanism and the temperature reduction monitoring mechanism of the present invention;

[0031] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point C in the middle.

[0032] In the figure: 1. Respirator body; 11. Straps; 111. Velcro; 12. Waist fastening belt; 13. Limit rod; 14. Gas box; 141. Air supply chamber; 142. Absorption chamber; 143. Recovery chamber; 144. Rubber sheet; 2. Respiratory mask; 21. Y-shaped tube; 22. One-way valve; 23. Separator; 231. Inhalation channel; 232. Exhalation channel; 3. Exhalation hose; 4. Inhalation hose; 5. Absorption mechanism; 51. Hole 1; 52. Card slot; 53. Sealing cover; 54. Card block; 55. accommodating box; 56. through hole; 6. monitoring oxygen supply mechanism; 61. oxygen cylinder; 62. pressure reducer; 63. electric control flow valve; 64. temperature sensor; 65. flow sensor; 7. monitoring cooling mechanism; 71. refrigerator; 72. heat pipe; 73. air pump; 8. air compressor; 81. pressure sensor; 9. load-reducing mechanism; 91. bar; 92. exhaust hole; 93. circular hole; 94. first turbine; 95. fixed shaft; 96. second turbine; 97. protective cover; 98. isolation net. DETAILED DESCRIPTION

[0033] 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. Embodiment 1

[0034] See also Figure 1-Figure 8 The present invention provides a technical solution: a bottom-connected positive pressure fire-fighting oxygen respirator with improved wearing comfort, comprising a respirator body 1, a shoulder strap 11 and a waist tightening belt 12 arranged on the respirator body 1, a limit rod 13 is installed on the respirator body 1, and there are multiple limit rods 13. A gas box 14 is installed on the limit rod 13. The gas box 14 is divided into three parts with the limit rod 13 as the boundary, namely, an air supply chamber 141 located in the upper part, an absorption chamber 142 located in the middle part, and a recovery chamber 143 located in the lower part. One side of the air supply chamber 141 and the absorption chamber 142 is composed of a rubber sheet 144, and further comprising:

[0035] like Figure 2 As shown, the breathing mask 2 is connected with a Y-shaped tube 21, the two sides of the apex of the Y-shaped tube 21 are respectively connected with the two sides of the breathing mask 2, and a one-way valve 22 is provided at each connection point, and a partition bar 23 is installed inside a section of the Y-shaped tube 21 away from the breathing mask 2, and the partition bar 23 divides the part connected with the Y-shaped tube 21 into two parts, one part is an inhalation channel 231, and the other part is an exhalation channel 232;

[0036] The end face of the exhalation hose 3 is semicircular, one end of which is connected to the exhalation channel 232, and the other end of which passes through the lower part of the respirator body 1 and is connected to the recovery chamber 143;

[0037] The inhalation hose 4 has the same shape as the exhalation hose 3 and is fixedly connected to form a circular tube with a partition in the middle. One end of the inhalation hose 4 is connected to the inhalation channel 231, and the other end is connected to the air supply cavity 141;

[0038] The absorption mechanism 5 is installed in the absorption chamber 142 to absorb carbon dioxide in the gas entering the gas supply chamber 141 from the recovery chamber 143;

[0039] The monitoring oxygen supply mechanism 6 is installed inside the respirator body 1 and injects corresponding oxygen into the air supply cavity 141 according to the frequency of exhaled and inhaled gas by the rescue personnel and the temperature in the air supply cavity 141 .

[0040] The absorption mechanism 5 includes a hole 51 opened in the absorption chamber 142 of the gas box 14, a card slot 52 is opened on the hole 51, a sealing cover 53 is rotatably installed at one end of the hole 51, a card block 54 is installed on the sealing cover 53, the card block 54 and the card slot 52 are engaged with each other, a containing box 55 is installed in the recovery chamber 143, and the containing box 55 is provided with through holes 56 on both sides of the containing box 55 that are in contact with the air supply chamber 141 and the recovery chamber 143 respectively. There are a plurality of through holes 56, which are evenly distributed. Calcium hydroxide particles and desiccant particles are placed in the containing box 55, and the calcium hydroxide particles and desiccant particles are wrapped in a net bag.

[0041] like Figure 1 , Figure 3 , Figure 4 As shown, the rescuer wears the equipment on his body through the shoulder strap 11 and the waist fastening belt 12. When performing rescue, due to the restriction of the one-way valve 22 at the connection between the Y-shaped tube 21 and the breathing mask 2, the gas exhaled by the rescuer can only enter the exhalation channel 232 through the one-way valve 22, and then enter the recovery chamber 143 through the exhalation hose 3. The gas inhaled by the rescuer is the air in the air supply chamber 141 that enters the inhalation hose 4, the inhalation channel 231, and then enters the breathing mask 2.

[0042] When the rescuer exhales, as the exhaled gas moves, the air pressure in the recovery chamber 143 increases, and the rubber sheet 144 of the recovery chamber 143 partially protrudes from the recovery chamber 143. When the rescuer inhales, as the inhaled gas moves, the air pressure in the air supply chamber 141 decreases, and the rubber sheet 144 of the air supply chamber 141 sinks into the air supply chamber 141 due to the negative pressure. In this state, part of the gas in the recovery chamber 143 passes through the containing box 55 and the calcium hydroxide particles and desiccant particles inside the containing box 55 under the influence of the pressure difference. The calcium hydroxide particles absorb the carbon dioxide in the exhaled gas of the rescuer, and water is produced when carbon dioxide and calcium hydroxide undergo a chemical reaction. The desiccant absorbs the water produced by the reaction to prevent the calcium hydroxide particles from turning into a solution when they meet water. The gas that has absorbed the carbon dioxide re-enters the air supply chamber 141, completing the gas circulation and extending the air supply time of the equipment.

[0043] The oxygen supply monitoring mechanism 6 includes an oxygen cylinder 61 installed in the respirator body 1, and also includes a pressure reducer 62 installed at the outlet end of the oxygen cylinder 61. The pressure reducer 62 is connected to an electrically controlled flow valve 63, and the electrically controlled flow valve 63 is connected to the air supply cavity 141 through a pipeline. A temperature sensor 64 is installed in the air supply cavity 141, and a flow sensor 65 is installed in the breathing mask 2. The flow sensor 65 and the temperature sensor 64 are electrically connected.

[0044] A monitoring and cooling mechanism 7 is installed in the respirator body 1. The monitoring and cooling mechanism 7 is used to cool the gas in the air supply cavity 141, including a refrigerator 71 installed in the respirator body 1. The refrigerator 71 is a semiconductor refrigeration type. A heat pipe 72 is installed on the refrigerator 71. One end of the heat pipe 72 is connected to the left side of the refrigerator 71, and the other end passes through the top and one side of the air supply cavity 141 and is connected to the right side of the refrigerator 71. The heat pipe 72 located in the air supply cavity 141 is spiral. An air pump 73 is installed on part of the heat pipe 72 located on one side of the refrigerator 71. The air pump 73 is electrically connected to the temperature sensor 64.

[0045] The heat pipe 72 is composed of a tube shell, a liquid wick and a working medium. The inner wall of the tube is attached with a concentric cylindrical metal wire mesh or other porous medium, i.e., the liquid wick. The liquid wick is filled with a working medium, which is a liquid with a low boiling point and is easily volatile. The medium in this equipment can be determined by the enterprise according to its productivity. For example, under standard atmospheric pressure, ether can be used, which has a boiling point of 34.5°C and is easily volatile, which is lower than the specified temperature of 35°C. For enterprises with a larger budget, the boiling point of different liquid media can be achieved by changing the air pressure in the tube shell, thereby controlling the boiling point of the medium at about 35°C to cool the heat pipe 72.

[0046] Compared with air, the gas exhaled by the rescuer has a lower oxygen content. After the carbon dioxide is absorbed by the absorption mechanism 5, the volume is reduced. In order to ensure that the rescuer can continue to perform rescue, oxygen needs to be added to the air supply chamber 141. The flow sensor 65 can determine the breathing frequency of the rescuer based on the amount of gas inhaled or exhaled by the rescuer within a certain period of time.

[0047] like Figure 4 As shown, when the breathing rate of the rescuer is relatively slow and the temperature sensor 64 detects that the temperature in the air supply chamber 141 is within 35°C, the pressure reducer 62 decompresses the compressed oxygen released from the oxygen cylinder 61, and then the oxygen is quantitatively added to the air supply chamber 141 under the action of the electronically controlled flow valve 63;

[0048] like Figure 5 As shown, the rescuer's breathing rate is too high, indicating that he is performing heavy physical activities. At this time, the temperature of the gas exhaled by the rescuer is high, and the carbon dioxide in the exhaled gas will also release heat when reacting with calcium hydroxide. The temperature in the air supply chamber 141 will increase rapidly and significantly. When the temperature sensor 64 detects that the temperature in the air supply chamber 141 is close to 35°C, the medium in the spiral part of the heat pipe 72 boils and converts into steam. Then, under the guidance of the air pump 73, it enters the refrigerator 71 for condensation. The condensed liquid returns to the spiral part of the heat pipe 72, and the cycle is repeated to rapidly reduce the temperature in the air supply chamber 141. The power of the air pump 73 can be controlled according to the temperature in the air supply chamber 141, thereby achieving control of the temperature in the air supply chamber 141. For example, when the rescue work has just begun and the temperature sensor 64 has not detected high temperature, the air pump 73 stops working, the medium in the heat pipe 72 has not reached the boiling point, and the evaporation rate is slow, which has little impact on the temperature in the air supply cavity 141, thereby avoiding the discomfort caused by the rescue personnel inhaling air with too low a temperature due to traditional ice cubes or blue ice refrigerants in the early stage of the rescue work.

[0049] An air compressor 8 is installed in the recovery chamber 143 , and an air outlet of the air compressor 8 is connected to the outside world, so as to compress the excess gas in the recovery chamber 143 and discharge it to the outside world.

[0050] A load-reducing mechanism 9 is installed on the respirator body 1, and the load-reducing mechanism 9 is connected to the air compressor 8. It is used to use the high-pressure gas discharged by the air compressor 8 as power to provide an upward force to the respirator body 1, including a strip rod 91 installed at the air outlet of the air compressor 8, an exhaust hole 92 is opened in the strip rod 91, and a circular hole 93 is opened on the strip rod 91. The circular hole 93 is connected to the exhaust hole 92, and the center of the circle is far away from the exhaust hole 92. There are multiple circular holes 93, each of which is installed with a first turbine 94, and a second turbine 96 is installed on the first turbine 94 through a fixed shaft 95. A protective cover 97 is installed on the strip rod 91, and the protective cover 97 surrounds the second turbine 96. An isolation net 98 is installed on the protective cover 97.

[0051] like Figure 7 , Figure 8 As shown, when the rescuer performs heavy physical activities, the monitoring oxygen supply mechanism 6 will supply more oxygen, and at the same time, more gas breathed by the rescuer will be collected in the recovery chamber 143. As the breathing frequency of the rescuer increases, the gas in the recovery chamber 143 may not be able to pass through the absorption mechanism 5 in time, resulting in excessive pressure in the recovery chamber 143. The rescuer needs more force to exhale, so the excess gas needs to be discharged, and the air compressor 8 is turned on to compress the gas in the recovery chamber 143 and release it through the air outlet. The released high-pressure gas is discharged to the outside through the exhaust hole 92. When this part of the high-pressure gas passes through the exhaust hole 92, it drives the first turbine 94 to rotate at a high speed. The first turbine 94 synchronously drives the second turbine 96 to rotate through the fixed shaft 95. The airflow generated by the high-speed rotation of the second turbine 96 flows toward the bottom of the respirator body 1, thereby applying a reaction force to the respirator body 1, thereby reducing the burden on the rescuer. Embodiment 2

[0052] See also Figure 1 , Figure 7 , Figure 8 Based on Example 1, the present invention further optimizes this solution:

[0053] A Velcro 111 is provided on one side of the shoulder strap 11, and the Velcro 111 fixes the inhalation hose 4 and the exhalation hose 3 on the shoulder strap 11, so as to prevent the hose for breathing of the rescuers from swinging during the rescue process and affecting the rescue work.

[0054] A pressure sensor 81 is installed in the recovery chamber 143. The pressure sensor 81 is electrically connected to the air compressor 8. When the air compressor 8 discharges excess gas, the discharge amount is accurately controlled to avoid affecting the gas circulation inside the equipment.

[0055] 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.

[0056] 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 bottom-connected positive pressure fire-fighting oxygen breathing apparatus with improved wearing comfort, comprising a breathing apparatus body (1), a shoulder strap (11) and a waist tightening belt (12) arranged on the breathing apparatus body (1), the breathing apparatus body (1) being provided with a limit rod (13), the limit rod (13) being provided with a plurality of limit rods, a gas box (14) being provided on the limit rod (13), the gas box (14) being divided into three parts with the limit rod (13) as the boundary, namely, a gas supply chamber (141) located in the upper part, an absorption chamber (142) located in the middle part and a recovery chamber (143) located in the lower part, one side of the gas supply chamber (141) and the absorption chamber (142) being formed by a rubber sheet (144), characterized in that: Also includes: A breathing mask (2), wherein the breathing mask (2) is connected to a Y-shaped tube (21), the two sides of the apex of the Y-shaped tube (21) are respectively connected to the two sides of the breathing mask (2), and a one-way valve (22) is provided at each connection point, and a partition bar (23) is installed inside a section of the Y-shaped tube (21) away from the breathing mask (2), and the partition bar (23) divides the part connected to the Y-shaped tube (21) into two parts, one part is an inhalation channel (231), and the other part is an exhalation channel (232); An exhalation hose (3), the end surface of the exhalation hose (3) being semicircular, one end of which is in communication with the exhalation channel (232), and the other end of which passes through the lower portion of the respirator body (1) and is in communication with the recovery chamber (143); An inhalation hose (4), the inhalation hose (4) having the same shape as the exhalation hose (3), and the two being fixedly connected to form a circular tube with a partition in the middle, one end of the inhalation hose (4) being in communication with the inhalation channel (231), and the other end being in communication with the air supply cavity (141); An absorption mechanism (5), wherein the absorption mechanism (5) is installed in the absorption chamber (142) and absorbs carbon dioxide in the gas entering the gas supply chamber (141) from the recovery chamber (143); The monitoring oxygen supply mechanism (6) is installed inside the respirator body (1) and injects corresponding oxygen into the air supply cavity (141) according to the frequency of exhaled and inhaled gas by the rescuer and the temperature in the air supply cavity (141).

2. A bottom-connected positive pressure fire-fighting oxygen breathing apparatus with improved wearing comfort according to claim 1, characterized in that: The absorption mechanism (5) comprises a hole (51) formed in the absorption chamber (142) of the gas box (14); a slot (52) is formed on the hole (51); a sealing cover (53) is rotatably mounted on one end of the hole (51); a block (54) is mounted on the sealing cover (53); the block (54) and the slot (52) are mutually engaged; a receiving box (55) is mounted in the recovery chamber (143); through holes (56) are formed on two sides of the receiving box (55) that are in contact with the gas supply chamber (141) and the recovery chamber (143); a plurality of through holes (56) are provided and are evenly distributed; calcium hydroxide particles and desiccant particles are placed in the receiving box (55); and the calcium hydroxide particles and the desiccant particles are wrapped in a net bag.

3. A bottom-connected positive pressure fire-fighting oxygen respirator with improved wearing comfort according to claim 1, characterized in that: The monitoring oxygen supply mechanism (6) comprises an oxygen cylinder (61) installed in the respirator body (1), and also comprises a pressure reducer (62) installed at the outlet end of the oxygen cylinder (61); an electrically controlled flow valve (63) is installed on the pressure reducer (62); the electrically controlled flow valve (63) is connected to the air supply cavity (141) through a pipeline; a temperature sensor (64) is installed in the air supply cavity (141); a flow sensor (65) is installed in the respirator mask (2); and the flow sensor (65) and the temperature sensor (64) are electrically connected.

4. A bottom-connected positive pressure fire-fighting oxygen breathing apparatus with improved wearing comfort according to claim 3, characterized in that: A monitoring and cooling mechanism (7) is installed in the respirator body (1). The monitoring and cooling mechanism (7) is used to cool the gas in the air supply cavity (141), and includes a refrigerator (71) installed in the respirator body (1). The refrigerator (71) is a semiconductor refrigeration type. A heat pipe (72) is installed in communication with the refrigerator (71). One end of the heat pipe (72) is connected to the left side of the refrigerator (71), and the other end passes through the top and one side of the air supply cavity (141) and is connected to the right side of the refrigerator (71). The heat pipe (72) located in the air supply cavity (141) is spiral-shaped. An air pump (73) is installed on part of the heat pipe (72) located on one side of the refrigerator (71). The air pump (73) is electrically connected to the temperature sensor (64).

5. A bottom-connected positive pressure fire-fighting oxygen breathing apparatus with improved wearing comfort according to claim 1, characterized in that: An air compressor (8) is installed in the recovery chamber (143); an air outlet of the air compressor (8) is in communication with the outside world, and is used to compress excess gas in the recovery chamber (143) and discharge it to the outside world.

6. A bottom-connected positive pressure fire-fighting oxygen breathing apparatus with improved wearing comfort according to claim 5, characterized in that: The respirator body (1) is provided with a load-reducing mechanism (9), which is connected to an air compressor (8) and is used to use the high-pressure gas discharged by the air compressor (8) as a driving force to provide an upward force to the respirator body (1), and comprises a strip rod (91) installed at the air outlet of the air compressor (8), an exhaust hole (92) being provided in the strip rod (91), a circular hole (93) being provided on the strip rod (91), the circular hole (93) being connected to the exhaust hole (92) and the center of the circle being far away from the exhaust hole (92), and a plurality of circular holes (93) being provided, each of the circular holes (93) being provided with a first turbine (94), a second turbine (96) being provided on the first turbine (94) via a fixed shaft (95), a protective cover (97) being provided on the strip rod (91), the protective cover (97) surrounding the second turbine (96), and an isolation net (98) being provided on the protective cover (97).

7. A bottom-connected positive pressure fire-fighting oxygen breathing apparatus with improved wearing comfort according to claim 1, characterized in that: A Velcro (111) is provided on one side of the shoulder strap (11), and the Velcro (111) fixes the inhalation hose (4) and the exhalation hose (3) on the shoulder strap (11).

8. The bottom-connected positive pressure fire-fighting oxygen breathing apparatus with improved wearing comfort according to claim 5, characterized in that: A pressure sensor (81) is installed in the recovery chamber (143), and the pressure sensor (81) is electrically connected to the air compressor (8).

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