A series type double-absorber tank circulation respirator

Abstract

The invention serial double-absorber tank circulation type respirator comprises double-absorber tanks with the same structure, wherein one of the double-absorber tanks comprises a tank body, a left cover with a left gas inlet, and a right cover with a right gas outlet, a flow guide cover is arranged on the inner wall of the left cover around the left gas inlet, the flow guide cover comprises an inner and outer flow guide cover body which is integrated and left-side open, the circumferential side wall of the inner and outer flow guide cover body is concentric and coplanar with the right-side sealing plate, the circumferential side wall of the inner flow guide cover body is uniformly and spacedly provided with inner flow guide holes and the circumferential inner side wall is attached with a grease-proof film, the right-side sealing plate of the outer flow guide cover body is uniformly and spacedly provided with outer flow guide holes along the circumference, the left and right flow guide grilles are fixed to the left and right ends of the tank body, the circular diameter of the outer flow guide holes is half of the diameter of the left flow guide grille, so that the length of the flow path of the gas in the exhalation bag after flowing through the left gas inlet, the grease-proof film and the inner and outer flow guide holes is the same, the gas flows uniformly to the middle and side of the left flow guide grille, the left and right water-absorbing sponges are fixed in the tank body, and the absorber cavity is arranged between the left and right water-absorbing sponges.

Description

Technical Field

[0001] This invention relates to the field of respirator technology, and in particular to a series-connected dual-absorbent-canister respirator. Background Technology

[0002] A typical respirator uses an absorbent canister to purify carbon dioxide. The absorbent in this canister is usually in granular form, dispersed throughout. This absorbent canister has the following drawbacks:

[0003] 1. During use, even if the usage time has not reached the maximum usage time of the carbon dioxide absorbent after a dive, it is impossible to completely distinguish between saturated and unsaturated carbon dioxide absorbents. From a safety perspective, it is necessary to replace the entire carbon dioxide absorbent, which will inevitably result in a large waste.

[0004] 2. If the carbon dioxide absorbent in the absorbent tank is not filled properly or not in place, it may cause cross-flow, resulting in a decrease in the utilization rate of the carbon dioxide absorbent or even direct failure, which will greatly affect the operation of the personnel carrying the absorbent tank.

[0005] 3. After passing through the left cover of the absorbent tank, the gas gathers in the middle of the guide grid, and the gas preferentially passes through the middle of the absorbent tank; while the flow path on both sides of the absorbent tank is longer, resulting in less airflow and reduced absorption efficiency of the carbon dioxide absorbent on both sides of the absorbent tank. This means the carbon dioxide absorbent inside the absorbent tank is not fully utilized, resulting in waste of the carbon dioxide absorbent (see...). Figure 1 ).

[0006] 4. The carbon dioxide absorbent in the absorbent tank is prone to clumping. Summary of the Invention

[0007] This invention addresses the problems and shortcomings of existing technologies by providing a series-connected dual-absorbent-canister circulating respirator.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution:

[0009] This invention provides a series-connected dual absorbent canister circulating respirator, comprising an exhalation bag and an inhalation bag, characterized in that it includes a first absorbent canister and a second absorbent canister connected in series, the total capacity of the first absorbent canister and the second absorbent canister is the same as the total capacity of the original absorbent canister, the left end of the first absorbent canister is connected to the exhalation bag tubing, the right end of the first absorbent canister is connected to the left end of the second absorbent canister, and the right end of the second absorbent canister is connected to the inhalation bag tubing.

[0010] The first absorbent container includes a first container body and a first left cover and a first right cover respectively covering the left and right sides of the first container body. A first left air inlet is located at the center of the first left cover, and a first right air outlet is located at the center of the first right cover. A first flow guide is fixedly mounted on the inner wall of the first left cover around the first left air inlet. The first flow guide includes an integrally designed inner flow guide body and a first outer flow guide body, both open on the left side. The circumferential sidewalls of the inner and outer flow guide bodies are concentrically arranged. The right sealing plate of the inner and outer flow guide bodies is coplanar. The circumferential sidewall of the inner flow guide body has evenly spaced first internal flow holes along the circumferential direction, and a first anti-grease film is attached to the inner circumferential sidewall. The right sealing plate of the outer flow guide body has evenly spaced first internal flow holes along the circumferential direction. The first canister is provided with evenly spaced first external guide holes. The left and right ends of the first canister are respectively fixed with a first left guide grid and a first right guide grid with evenly spaced guide holes. The diameter of the circle formed by the first external guide holes is half the diameter of the first left guide grid. The first external guide holes are all facing the first left guide grid. This makes the gas in the exhalation bag flow through the first left air inlet, the first anti-grease film, the first inner guide hole and the first external guide hole in sequence. The flow path lengths inward and outward are the same, so that the gas flows evenly to the middle and side positions of the first left guide grid. The first canister is fixed with a first left absorbent sponge on the right side of the first left guide grid and a first right absorbent sponge on the left side of the first right guide grid. A first absorbent cavity filled with granular carbon dioxide absorbent is formed between the first left absorbent sponge and the first right absorbent sponge.

[0011] The structure of the second absorbent canister is the same as that of the first absorbent canister. The gas in the exhalation bag flows sequentially through the first left air inlet, the first grease-proof membrane, the first inner guide hole, the first outer guide hole, the first left guide grid, the first left absorbent sponge, the first absorbent cavity, the first right absorbent sponge, the first right guide grid, the first right air outlet, and the second absorbent canister, so that clean gas flows into the inhalation bag.

[0012] The present invention also provides a series dual absorbent canister circulating respirator, including an exhalation bag and an inhalation bag, characterized in that it includes a first absorbent canister and a second absorbent canister connected in series, the total capacity of the first absorbent canister and the second absorbent canister is the same as the total capacity of the original absorbent canister, the left end of the first absorbent canister is connected to the exhalation bag tube, the right end of the first absorbent canister and the left end of the second absorbent canister are connected and communicated, and the right end of the second absorbent canister is connected to the inhalation bag tube.

[0013] The first absorbent container includes a first container body and a first left cover and a first right cover respectively covering the left and right sides of the first container body. A first left air inlet is located at the center of the first left cover, and a first right air outlet is located at the center of the first right cover. A first flow guide hood with a left open side is fixedly mounted on the inner wall of the first left cover around the first left air inlet. The circumferential sidewall of the first flow guide hood has evenly spaced first flow guide holes along its circumferential direction, and a ring of first flow guide grease-proof film is affixed to the inner circumferential sidewall. A first L-shaped flow guide rod is fixed to the outer side of each first flow guide hole, and a first rod flow guide hole is located at the lateral end of each first L-shaped flow guide rod. The left and right ends of the first container body are respectively fixed with evenly spaced flow guide holes. The first left and first right guide grids are provided. The diameter of the circle formed by the first rod guide hole is half the diameter of the first left guide grid. The first rod guide holes are all facing the first left guide grid. This makes the gas in the exhalation bag flow through the first left air inlet, the first cover guide hole and the first rod guide hole in sequence. The inward and outward flow path lengths are the same, so that the gas flows evenly to the middle and side positions of the first left guide grid. The first canister is fixed with a first left absorbent sponge on the right side of the first left guide grid and a first right absorbent sponge on the left side of the first right guide grid. A first absorbent cavity filled with granular carbon dioxide absorbent is formed between the first left absorbent sponge and the first right absorbent sponge.

[0014] The structure of the second absorbent canister is the same as that of the first absorbent canister. The gas in the exhalation bag flows sequentially through the first left air inlet, the first cover oil-proof membrane, the first cover guide hole, the first rod guide hole, the first left guide grid, the first left absorbent sponge, the first absorbent cavity, the first right absorbent sponge, the first right guide grid, the first right air outlet, and the second absorbent canister, so that clean gas flows into the inhalation bag.

[0015] The positive and progressive effects of this invention are as follows:

[0016] In this invention, two absorbent tanks are used. If the diving time has not reached the maximum usage time, only the first absorbent tank needs to be replaced, and the second absorbent tank is placed in the position of the first absorbent tank. A new absorbent tank is then filled and placed in the original position of the second absorbent tank. This process can be repeated, which can save 50% of the carbon dioxide absorbent.

[0017] In this invention, the use of two absorbent tanks reduces the possibility of crossflow (or bridging) due to improper filling. (If only one absorbent tank is used, crossflow will occur if it is not filled properly, resulting in immediate failure. If only one absorbent tank is used, crossflow will occur if only one is not filled properly, but the other good one can still be used, so it will not fail immediately, thus solving the crossflow problem.)

[0018] In this invention, after adding a flow guide hood inside each absorbent tank, the flow guide hood directs the airflow to the middle and side positions of the left flow guide grid. This design ensures that the inward and outward flow paths of the airflow are of the same length, making the airflow through the carbon dioxide absorbent more evenly dispersed, which is more conducive to the utilization of the carbon dioxide absorbent and improves the absorption rate of the carbon dioxide absorbent.

[0019] In this invention, each absorbent canister is equipped with absorbent sponges on both sides of the absorbent chamber to absorb moisture in exhaled air, prevent the carbon dioxide absorbent from clumping, facilitate the utilization of the carbon dioxide absorbent, and improve the absorption rate of the carbon dioxide absorbent.

[0020] In this invention, the oxygen from the oxygen cylinder and the mixed gas cylinder will carry a small amount of free oil molecules when it enters the exhalation bag. An anti-oil membrane is set up to absorb the small amount of free oil molecules in the gas transmitted from the exhalation bag and remove the small amount of free oil molecules in the gas. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the gas flow path in an existing absorbent tank.

[0022] Figure 2 This is a schematic diagram of the structure of the series-connected dual-absorbent-canister circulating respirator of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the series-connected dual absorbent tanks in Example 1.

[0024] Figure 4 This is an enlarged view of the first absorbent container in Example 1.

[0025] Figure 5 This is a flow path diagram of exhaled gas in Example 1.

[0026] Figure 6 This is a schematic diagram of the structure of the series-connected dual absorbent tank in Example 2.

[0027] Figure 7 This is a schematic diagram of the structure of the first flow guide cover and the first L-shaped flow guide rod in Embodiment 2.

[0028] Figure 8-9 for Figure 7 A sectional view.

[0029] Figure 10 This is a flow path diagram of exhaled gas in Example 2. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] For ease of description, only the parts relevant to the present invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are merely for the convenience of describing the technical solutions of the invention and do not have a specific limiting effect; they are all general references and do not constitute a limitation on the technical solutions of the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Terms indicating positional relationships, such as "middle," "horizontal," "vertical," "longitudinal," "front," "rear," "left," "right," "inner," and "outer," are based on the positional relationships shown in the illustrated drawings and do not imply that the components referred to must be presented in the described positional relationships, and do not constitute a limitation on the technical solutions of the present invention.

[0032] like Figure 2-10 As shown, the present invention provides a series-connected dual absorbent canister circulating respirator, including an exhalation bag 1, an inhalation bag 2, and a first absorbent canister 100 and a second absorbent canister 200 connected in series. The two absorbent canisters are connected in series, and the gas flow pattern is: exhaled gas — exhalation bag 1 — first absorbent canister 100 — second absorbent canister 200 — inhalation bag 2.

[0033] The total capacity of the first absorbent canister 100 and the second absorbent canister 200 is the same as the total capacity of the original absorbent canisters. For example, in a certain circulating respirator, if the designed absorbent canister volume is 2L, then absorbent canisters are used, and each absorbent canister has a volume of 1L.

[0034] The series length of the first absorbent tank 100 and the second absorbent tank 200 is the same as the length of the original absorbent tank, and the diameters of the first absorbent tank 100 and the second absorbent tank 200 are the same in the width direction.

[0035] This design, which keeps the total capacity and length of the dual absorbent tanks constant, results in the diameters of the two absorbent tanks of this invention being larger than the diameters of the original absorbent tanks.

[0036] The left end of the first absorbent canister 100 is connected to the exhalation bag 1 pipe, and the right end of the first absorbent canister 100 and the left end of the second absorbent canister 200 are connected. Specifically, an O-ring 3 is sandwiched between the right end of the first absorbent canister 100 and the left end of the second absorbent canister 200, and a connecting bushing 4 is fitted and fixed on the outside of the connection. The right end of the second absorbent canister 200 is connected to the inhalation bag 2 pipe. Example 1

[0037] In this embodiment, the first absorbent tank 100 includes a first tank body 101 and a first left cover 102 and a first right cover 103 respectively covering the left and right sides of the first tank body 101. A first left air inlet 1021 is opened at the middle position of the first left cover 102, and a first right air outlet 1031 is opened at the middle position of the first right cover 103. A first flow guide is fixedly installed around the first left air inlet 1021 at the middle position of the inner wall of the first left cover 102. The first flow guide includes a first inner flow guide body 104 and a first outer flow guide body 105 with an integrated design and an open left side. The circumferential sidewalls of the inner guide shroud 104 and the first outer guide shroud 105 are concentrically arranged. The right sealing plate of the first inner guide shroud 104 and the right sealing plate of the first outer guide shroud 105 are coplanar. The circumferential sidewall of the first inner guide shroud 104 is provided with first inner guide holes 1041 evenly spaced along the circumferential direction, and a first anti-grease film 1042 is attached to the inner circumferential sidewall. The right sealing plate of the first outer guide shroud 105 is provided with first outer guide holes 1051 evenly spaced along the circumferential direction. The first inner guide holes 1041 and the first outer guide holes 1051 are... In a one-to-one correspondence, the left and right ends of the first canister 101 are respectively fixed with a first left guide grille 106 and a first right guide grille 107, each having uniformly spaced guide holes. The diameter of the circle formed by the first outer guide hole 1051 is half the diameter of the first left guide grille 106, and all the first outer guide holes 1051 face the first left guide grille 106. This ensures that the gas in the exhalation bag 1 flows sequentially through the first left air inlet 1021, the first anti-grease film 1042, the first inner guide hole 1041, and the first outer guide hole 1051, with the same inward and outward flow path length, thus ensuring that the gas... The water flows evenly to the middle and side positions of the first left guide grid 106. A first left absorbent sponge 108 is fixed inside the first tank 101 and located on the right side of the first left guide grid 106. A first right absorbent sponge 109 is fixed on the left side of the first right guide grid 107. The first left guide grid 106 and the first left absorbent sponge 108 are closely attached to each other. The first right guide grid 107 and the first right absorbent sponge 109 are closely attached to each other. A first absorbent cavity 110 filled with granular carbon dioxide absorbent is formed between the first left absorbent sponge 108 and the first right absorbent sponge 109.

[0038] The second absorbent tank 200 includes a second tank body 201 and a second left cover 202 and a second right cover 203 respectively covering the left and right sides of the second tank body 201. A second left air inlet 2021 is provided at the center of the second left cover 202, and a second right air outlet 2031 is provided at the center of the second right cover 203. A second flow guide is fixedly mounted around the second left air inlet 2021 on the inner wall of the second left cover 202. The second flow guide includes a second inner flow guide body 204 with an integrated design and an open left side, and a second outer flow guide body 205. The circumferential sidewalls of the inner guide hood 204 and the outer guide hood 205 are concentrically arranged. The right-side sealing plate of the second inner guide hood 204 and the right-side sealing plate of the second outer guide hood 205 are coplanar. The circumferential sidewalls of the second inner guide hood 204 are evenly spaced with second inner guide holes along the circumferential direction, and a second anti-grease film is attached to the inner circumferential sidewall. The right-side sealing plate of the second outer guide hood 205 is evenly spaced with second outer guide holes along the circumferential direction. The second inner guide holes and the second outer guide holes correspond one-to-one. The second tank 201... A second left guide grille 206 and a second right guide grille 207, each with uniformly spaced guide holes, are fixed to the left and right ends respectively. The diameter of the circle formed by the second outer guide holes is half the diameter of the second left guide grille 206, and all the second outer guide holes face the second left guide grille 206. This ensures that the gas flowing from the first right outlet 1031 of the first absorbent tank 100 flows sequentially through the second left inlet 2021, the second anti-grease film, the second inner guide hole, and the second outer guide hole, with the same inward and outward flow path length. This results in the gas flowing uniformly towards the second left guide grille 207. At the middle and side positions of the flow grid 206, a second left absorbent sponge 208 is fixed inside the second tank 201 and located to the right of the second left guide grid 206, and a second right absorbent sponge 209 is fixed to the left of the second right guide grid 207. The second left guide grid 206 and the second left absorbent sponge 208 are closely attached to each other, and the second right guide grid 207 and the second right absorbent sponge 209 are closely attached to each other. A second absorbent cavity 210 filled with granular carbon dioxide absorbent is formed between the second left absorbent sponge 208 and the second right absorbent sponge 209.

[0039] In this embodiment, the structure of the second absorbent canister is the same as that of the first absorbent canister. The flow path of the exhaled gas is as follows: exhaled gas — exhalation bag 1 — first left air inlet 1021 — first anti-grease membrane 1042 — first inner guide hole 1041 — first outer guide hole 1051 — first left guide grid 106 — first left absorbent sponge 108 — first absorbent chamber 110 — first right absorbent sponge 109 — first right guide grid 107 — first right air outlet 1031 — second left air inlet 2021 — second anti-grease membrane — second inner guide hole — second outer guide hole — second left guide grid 206 — second left absorbent sponge 208 — second absorbent chamber 210 — second right absorbent sponge 209 — second right guide grid 207 — second right air outlet 2031 — inhalation bag 2. Finally, the clean gas after carbon dioxide absorption by the dual absorbent canisters flows into the inhalation bag 2.

[0040] In this embodiment, two absorbent tanks are used. If the diving time has not reached the maximum usage time, only the first absorbent tank can be replaced, and the second absorbent tank can be placed in the position of the first absorbent tank. A new absorbent tank is then filled and placed in the original position of the second absorbent tank. This process can be repeated, which can save 50% of the carbon dioxide absorbent.

[0041] In this embodiment, the use of two absorbent tanks reduces the possibility of crossflow (or bridging) due to improper filling. (If only one absorbent tank is used, crossflow will occur if it is not filled properly, resulting in immediate failure. If only one absorbent tank is used, crossflow will occur if only one is not filled properly, but the other good one can still be used, so it will not fail immediately, thus solving the crossflow problem.)

[0042] In this embodiment, after adding a first flow guide hood inside the first absorbent tank 100, the first flow guide hood directs the airflow to the middle and side positions of the first left flow guide grille 106. This design makes the inward and outward flow paths of the airflow the same length, making the airflow through the carbon dioxide absorbent more evenly dispersed, which is more conducive to the utilization of the carbon dioxide absorbent and improves the absorption rate of the carbon dioxide absorbent.

[0043] In this embodiment, after adding a second flow guide hood inside the second absorbent tank 200, the second flow guide hood directs the airflow to the middle and side positions of the second left flow guide grille 206. This design makes the inward and outward flow paths of the airflow the same length, making the airflow through the carbon dioxide absorbent more evenly dispersed, which is more conducive to the utilization of the carbon dioxide absorbent and improves the absorption rate of the carbon dioxide absorbent.

[0044] In this embodiment, each absorbent canister is equipped with absorbent sponges on both sides of the absorbent chamber to absorb moisture in exhaled air, prevent the carbon dioxide absorbent from clumping, facilitate the utilization of the carbon dioxide absorbent, and improve the absorption rate of the carbon dioxide absorbent.

[0045] In this embodiment, the oxygen from the oxygen cylinder and the mixed gas cylinder will carry a small amount of free oil molecules when it enters the exhalation bag 1. An anti-oil membrane is set up to absorb the small amount of free oil molecules in the gas transmitted from the exhalation bag 1 and remove the small amount of free oil molecules in the gas. Example 2

[0046] like Figure 6-10 As shown, in this embodiment, the first absorbent container 100 includes a first container body 101 and a first left cover 102 and a first right cover 103 respectively covering the left and right sides of the first container body 101. A first left air inlet 1021 is provided at the middle position of the first left cover 102, and a first right air outlet 1031 is provided at the middle position of the first right cover 103. A first guide hood 111 with a left open opening is fixedly provided around the first left air inlet 1021 on the middle position of the inner wall of the first left cover 102. The first flow guide shroud 111 has evenly spaced first flow guide holes 1111 on its circumferential sidewall, and a ring of first shroud anti-grease film is attached to its inner circumferential sidewall. A first L-shaped flow guide rod 112 is fixed to the outside of each first flow guide hole 1111. A first rod flow guide hole is opened at the lateral end of each first L-shaped flow guide rod 112. A first left flow guide grille 106 and a first right flow guide grille 107 with evenly spaced flow guide holes are fixed to the left and right ends of the first tank 101, respectively. The diameter of the circle formed by the first rod-body guide hole is half the diameter of the first left guide grille 106, and all the first rod-body guide holes face the first left guide grille 106. This ensures that the gas in the exhalation bag 1 flows through the first left air inlet 1021, the first cover's anti-grease film, the first cover's guide hole 1111, and the first rod-body guide hole, with the same inward and outward flow path length. This results in the gas flowing evenly to the middle and side positions of the first left guide grille 106. The first canister 1 A first left absorbent sponge 108 is fixed to the right side of the first left guide grid 106, and a first right absorbent sponge 109 is fixed to the left side of the first right guide grid 107. The first left guide grid 106 and the first left absorbent sponge 108 are closely attached to each other, and the first right guide grid 107 and the first right absorbent sponge 109 are closely attached to each other. A first absorbent cavity 110 filled with granular carbon dioxide absorbent is formed between the first left absorbent sponge 108 and the first right absorbent sponge 109.

[0047] In this embodiment, the structure of the second absorbent tank is the same as that of the first absorbent tank, so it will not be described again here.

[0048] In this embodiment, the structure of the dual absorbent tank is the same as that of the dual absorbent tank in Example 1, and they are labeled with the same numbers.

[0049] The flow path of the exhaled gas is as follows: exhaled gas — exhalation bag 1 — first left air inlet 1021 — first cover anti-grease film — first cover guide hole 1111 — first rod guide hole — first left guide grid 106 — first left absorbent sponge 108 — first absorbent chamber 110 — first right absorbent sponge 109 — first right guide grid 107 — first right air outlet 1031 — second absorbent canister 200 — inhalation bag 2. Finally, the clean gas after carbon dioxide absorption by the double absorbent canisters flows into the inhalation bag 2.

[0050] In this embodiment, two absorbent tanks are used. If the diving time has not reached the maximum usage time, only the first absorbent tank can be replaced, and the second absorbent tank can be placed in the position of the first absorbent tank. A new absorbent tank is then filled and placed in the original position of the second absorbent tank. This process can be repeated, which can save 50% of the carbon dioxide absorbent.

[0051] In this embodiment, the use of two absorbent tanks reduces the possibility of crossflow (or bridging) due to improper filling. (If only one absorbent tank is used, crossflow will occur if it is not filled properly, resulting in immediate failure. If only one absorbent tank is used, crossflow will occur if only one is not filled properly, but the other good one can still be used, so it will not fail immediately, thus solving the crossflow problem.)

[0052] In this embodiment, after adding a first guide shroud 111 and a first L-shaped guide rod 112 inside the first absorbent tank 100, the airflow is directed to the middle and side positions of the first left guide grille 106. This design ensures that the inward and outward flow paths of the airflow are of equal length, resulting in a more even dispersion of the airflow through the carbon dioxide absorbent, which is more conducive to the utilization of the carbon dioxide absorbent and improves the absorption rate of the carbon dioxide absorbent. The second absorbent tank 100 is similarly designed.

[0053] In this embodiment, each absorbent canister is equipped with absorbent sponges on both sides of the absorbent chamber to absorb moisture in exhaled air, prevent the carbon dioxide absorbent from clumping, facilitate the utilization of the carbon dioxide absorbent, and improve the absorption rate of the carbon dioxide absorbent.

[0054] In this embodiment, the oxygen from the oxygen cylinder and the mixed gas cylinder will carry a small amount of free oil molecules when it enters the exhalation bag 1. An oil-proof membrane is set on the cover to absorb the small amount of free oil molecules in the gas transmitted from the exhalation bag 1 and remove the small amount of free oil molecules in the gas.

[0055] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A series-connected dual-absorbent-canister circulating respirator, comprising an exhalation bag and an inhalation bag, characterized in that, It includes a first absorbent canister and a second absorbent canister connected in series. The total capacity of the first absorbent canister and the second absorbent canister is the same as the total capacity of the original absorbent canister. The left end of the first absorbent canister is connected to the exhalation bag tubing. The right end of the first absorbent canister and the left end of the second absorbent canister are connected to each other. The right end of the second absorbent canister is connected to the inhalation bag tubing. The first absorbent container includes a first container body and a first left cover and a first right cover respectively covering the left and right sides of the first container body. A first left air inlet is located at the center of the first left cover, and a first right air outlet is located at the center of the first right cover. A first flow guide is fixedly mounted on the inner wall of the first left cover around the first left air inlet. The first flow guide includes an integrally designed inner flow guide body and a first outer flow guide body, both open on the left side. The circumferential sidewalls of the inner and outer flow guide bodies are concentrically arranged. The right sealing plate of the inner and outer flow guide bodies is coplanar. The circumferential sidewall of the inner flow guide body has evenly spaced first internal flow holes along the circumferential direction, and a first anti-grease film is attached to the inner circumferential sidewall. The right sealing plate of the outer flow guide body has evenly spaced first internal flow holes along the circumferential direction. The first canister is provided with evenly spaced first external guide holes. The left and right ends of the first canister are respectively fixed with a first left guide grid and a first right guide grid with evenly spaced guide holes. The diameter of the circle formed by the first external guide holes is half the diameter of the first left guide grid. The first external guide holes are all facing the first left guide grid. This makes the gas in the exhalation bag flow through the first left air inlet, the first anti-grease film, the first inner guide hole and the first external guide hole in sequence. The flow path lengths inward and outward are the same, so that the gas flows evenly to the middle and side positions of the first left guide grid. The first canister is fixed with a first left absorbent sponge on the right side of the first left guide grid and a first right absorbent sponge on the left side of the first right guide grid. A first absorbent cavity filled with granular carbon dioxide absorbent is formed between the first left absorbent sponge and the first right absorbent sponge. The structure of the second absorbent canister is the same as that of the first absorbent canister. The gas in the exhalation bag flows sequentially through the first left air inlet, the first grease-proof membrane, the first inner guide hole, the first outer guide hole, the first left guide grid, the first left absorbent sponge, the first absorbent cavity, the first right absorbent sponge, the first right guide grid, the first right air outlet, and the second absorbent canister, so that clean gas flows into the inhalation bag.

2. The series-connected dual-absorbent-canister circulating respirator as described in claim 1, characterized in that, The first left guide grille and the first left absorbent sponge are closely attached to each other, and the first right guide grille and the first right absorbent sponge are closely attached to each other.

3. The series-connected dual-absorbent-canister circulating respirator as described in claim 1, characterized in that, The series length of the first absorbent can and the second absorbent can is the same as the length of the original absorbent can, and the diameters of the first absorbent can and the second absorbent can are the same in the width direction.

4. The series-connected dual-absorbent-canister circulating respirator as described in claim 1, characterized in that, The first inner guide hole and the first outer guide hole correspond one-to-one.

5. The series-connected dual-absorbent-canister circulating respirator as described in claim 1, characterized in that, An O-ring is provided between the right end of the first absorbent tank and the left end of the second absorbent tank, and a connecting shaft sleeve is fitted and fixed on the outside of the connection.

6. A series-connected dual-absorbent-canister circulating respirator, comprising an exhalation bag and an inhalation bag, characterized in that, It includes a first absorbent canister and a second absorbent canister connected in series. The total capacity of the first absorbent canister and the second absorbent canister is the same as the total capacity of the original absorbent canister. The left end of the first absorbent canister is connected to the exhalation bag tubing. The right end of the first absorbent canister and the left end of the second absorbent canister are connected to each other. The right end of the second absorbent canister is connected to the inhalation bag tubing. The first absorbent container includes a first container body and a first left cover and a first right cover respectively covering the left and right sides of the first container body. A first left air inlet is located at the center of the first left cover, and a first right air outlet is located at the center of the first right cover. A first flow guide hood with a left open side is fixedly mounted on the inner wall of the first left cover around the first left air inlet. The circumferential sidewall of the first flow guide hood has evenly spaced first flow guide holes along its circumferential direction, and a ring of first flow guide grease-proof film is affixed to the inner circumferential sidewall. A first L-shaped flow guide rod is fixed to the outer side of each first flow guide hole, and a first rod flow guide hole is located at the lateral end of each first L-shaped flow guide rod. The left and right ends of the first container body are respectively fixed with evenly spaced flow guide holes. The first left and first right guide grids are provided. The diameter of the circle formed by the first rod guide hole is half the diameter of the first left guide grid. The first rod guide holes are all facing the first left guide grid. This makes the gas in the exhalation bag flow through the first left air inlet, the first cover guide hole and the first rod guide hole in sequence. The inward and outward flow path lengths are the same, so that the gas flows evenly to the middle and side positions of the first left guide grid. The first canister is fixed with a first left absorbent sponge on the right side of the first left guide grid and a first right absorbent sponge on the left side of the first right guide grid. A first absorbent cavity filled with granular carbon dioxide absorbent is formed between the first left absorbent sponge and the first right absorbent sponge. The structure of the second absorbent canister is the same as that of the first absorbent canister. The gas in the exhalation bag flows sequentially through the first left air inlet, the first cover oil-proof membrane, the first cover guide hole, the first rod guide hole, the first left guide grid, the first left absorbent sponge, the first absorbent cavity, the first right absorbent sponge, the first right guide grid, the first right air outlet, and the second absorbent canister, so that clean gas flows into the inhalation bag.

7. The series-connected dual-absorbent-canister circulating respirator as described in claim 6, characterized in that, The first left guide grille and the first left absorbent sponge are closely attached to each other, and the first right guide grille and the first right absorbent sponge are closely attached to each other.

8. The series-connected dual-absorbent-canister circulating respirator as described in claim 6, characterized in that, The series length of the first absorbent can and the second absorbent can is the same as the length of the original absorbent can, and the diameters of the first absorbent can and the second absorbent can are the same in the width direction.

9. The series-connected dual-absorbent-canister circulating respirator as described in claim 6, characterized in that, An O-ring is provided between the right end of the first absorbent tank and the left end of the second absorbent tank, and a connecting shaft sleeve is fitted and fixed on the outside of the connection.

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