Breathing gas circulation and oxygen recovery device for field first-aid breathing machine

Abstract

The utility model belongs to the field of breathing equipment technology, concretely is a kind of breathing gas circulation and oxygen recovery device for field first-aid breathing machine, the device includes coil pipe type gas holder, adapter block, carbon dioxide absorption tank;The coil pipe type gas holder is connected with carbon dioxide absorption tank by adapter block.The utility model is applicable to field first-aid scene, simple structure, small and exquisite, can be integrated in the oxygen recovery device inside breathing machine, recovery rate is high and there is no power consumption, and cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of respiratory equipment technology, specifically a breathing gas circulation and oxygen recovery device for a field emergency ventilator. Background Technology

[0002] In wilderness first aid scenarios, a portable ventilator is often needed to provide respiratory support to patients. The portability requirement of breathing equipment means that high-pressure oxygen cylinders cannot be carried, and there are usually limitations in power supply when using it in the wild. It can only be powered by the lithium battery on the device itself, which forces breathing equipment to use a low-power micro oxygen generator to provide oxygen source, resulting in a continuous oxygen output of <2L / min. An adult absorbs about 20-30ml of oxygen in a single breath at rest. Most of the residual oxygen is exhaled into the atmosphere, resulting in more than 70% of oxygen resources being wasted. This waste will further aggravate the oxygen shortage when the oxygen supply is insufficient in wilderness first aid, resulting in a slow increase in the oxygen concentration in the patient's airway, or even failure to reach the effective treatment oxygen concentration threshold (≥60%), resulting in poor treatment effect or even failure in the wild. Currently, the main technologies for gas separation and recovery on the market include condensation, pressure swing adsorption (PSA), and membrane separation. Condensation involves compressing and condensing the gas, then using the difference in boiling points for distillation to separate different gases. However, due to the high energy consumption of compression and condensation, cryogenic separation is more suitable for large-scale gas separation processes. PSA utilizes the characteristic that the adsorption capacity of the adsorbent changes with pressure. Gas adsorption and separation are completed under pressure, and adsorbent regeneration is completed under depressurization, thus achieving gas separation and adsorbent recycling. This requires a compressor and a gas storage tank. Membrane separation separates gases based on the difference in permeation rates of the membrane. Gases with faster permeation rates are enriched on the permeate side, while gases with slower permeation rates are enriched on the feed side. This requires high driving pressure, typically above 0.5 MPa. These separation technologies require large equipment and high pressure, and are usually used in large-scale industrial gas separation, not suitable for small-volume portable gas separation and recovery equipment. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and propose a breathing gas circulation and oxygen recovery device for a field emergency ventilator. This invention is suitable for field emergency scenarios, features a simple structure and compact size, and is an oxygen recovery device that can be integrated inside the ventilator. It boasts a high recovery rate, consumes no electricity, and is low in cost.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A breathing gas circulation and oxygen recovery device for a field emergency ventilator, the device comprising a coil-type gas storage tank, an adapter block, and a carbon dioxide absorption tank; the coil-type gas storage tank is connected to the carbon dioxide absorption tank via the adapter block; The coil-type gas storage tank is equipped with a coil channel, an exhalation channel, and an inhalation channel; The air outlet of the coil channel is connected to the exhalation channel; the air inlet of the coil channel is connected to the drive air connector. The adapter block is provided with a carbon dioxide absorption tank installation cavity, a carbon dioxide absorption tank inlet channel, and a carbon dioxide absorption tank outlet channel; the carbon dioxide absorption tank is installed in the carbon dioxide absorption tank installation cavity, the carbon dioxide absorption tank inlet channel is connected to the exhalation channel and connected to the waste outlet via an oxygen concentration regulating valve, and the carbon dioxide absorption tank outlet channel is connected to the inhalation channel and the fresh gas connector. The carbon dioxide absorption tank includes an absorption tank body, in which a carbon dioxide absorption tank inlet and a carbon dioxide absorption tank outlet are provided; the carbon dioxide absorption tank inlet is connected to a carbon dioxide absorption tank inlet channel, and the carbon dioxide absorption tank outlet is connected to a carbon dioxide absorption tank outlet channel.

[0005] Preferably, the coil channel is installed in the gas storage tank and is divided into an upper coil channel and a lower coil channel. The upper coil channel and the lower coil channel are separated by a coil partition. The air inlet of the upper coil channel is connected to the air outlet of the lower coil channel through a connecting port. The air outlet of the upper coil channel is connected to the exhalation channel, and the air inlet of the lower coil channel is connected to the drive air connector.

[0006] Preferably, the coil-type gas storage tank further includes an upper cover and a lower cover, with an upper sealing gasket provided between the gas storage tank body and the upper cover, and a lower sealing gasket provided between the gas storage tank body and the lower cover.

[0007] Preferably, the exhalation channel is connected to the exhalation connector via a one-way valve, and the inhalation channel is connected to the inhalation connector via a one-way valve.

[0008] Preferably, the adapter block is further provided with a carbon dioxide absorber inlet insertion hole and a carbon dioxide absorber outlet insertion hole; the carbon dioxide absorber inlet channel is connected to the carbon dioxide absorber inlet through the carbon dioxide absorber inlet insertion hole; the carbon dioxide absorber outlet channel is connected to the carbon dioxide absorber outlet through the carbon dioxide absorber outlet insertion hole.

[0009] Preferably, the absorber body is provided with a middle partition to divide the absorber body into a left chamber and a right chamber. The upper part of the left chamber is provided with a carbon dioxide absorber inlet, and an upper partition is provided in front of the carbon dioxide absorber inlet. The lower part of the right chamber is provided with a carbon dioxide absorber outlet. Bottom screens are provided at a certain height from the bottom plate at the bottom of the left and right chambers. The absorber body with side plates relative to the carbon dioxide absorber inlet and outlet is open. This openness is closed by a carbon dioxide absorber cover, and a side screen is provided between the carbon dioxide absorber cover and the absorber body.

[0010] Preferably, an oxygen concentration regulating valve and a waste discharge port are provided at the lower end of the air inlet channel of the carbon dioxide absorption tank. The oxygen concentration regulating valve has a first valve port, a second valve port, and a third valve port. The first valve port is connected to the air inlet of the carbon dioxide absorption tank, and the second valve port is connected to the waste discharge port connecting channel. The oxygen concentration regulating valve is a normally closed valve. When not energized, the second valve port is connected to the third valve port, and the first valve port is in a closed state. When energized, the first valve port and the second valve port are connected, allowing the gas in the carbon dioxide absorption tank to enter the waste discharge port through the first valve port and be discharged.

[0011] Preferably, the air intake channel is equipped with an air intake safety valve and an oxygen concentration sensor.

[0012] Preferably, a mounting groove for the carbon dioxide absorption tank is provided on the side wall of the transition block of the mounting cavity of the carbon dioxide absorption tank, and a mounting boss is provided at the corresponding position on the carbon dioxide absorption tank.

[0013] Preferably, the coil volume of the coil-type gas storage tank is designed to be 1.2L, and the volume of the carbon dioxide absorption tank is 0.6L.

[0014] The technical advantages of this utility model are as follows: This invention collects exhaled gas using a coil-type gas storage tank. A carbon dioxide absorbent is filled into the tank to remove carbon dioxide from the gas, thus achieving gas recycling. The oxygen concentration in the patient's airway can be rapidly adjusted by opening and closing an oxygen concentration regulating valve. This invention has a compact, simple structure and low cost. Attached Figure Description

[0015] Figure 1 This is a front view of the breathing gas circulation and oxygen recovery device of this utility model; Figure 2 This is a rear view of the breathing gas circulation and oxygen recovery device of this utility model; Figure 3 This is a structural diagram of the coil-type gas storage tank of this utility model; Figure 4 This is a cross-sectional view of the upper coil channel of this utility model; Figure 5 This is a cross-sectional view of the lower coil channel of this utility model; Figure 6 This is a structural diagram of the adapter block of this utility model; Figure 7 This is a cross-sectional view of the working channel of the oxygen concentration regulating valve of this utility model; Figure 8 This is a structural diagram of the carbon dioxide absorption tank of this utility model; Figure 9This is a structural diagram of the carbon dioxide absorption tank (without a lid) of this utility model; Figure 10 This is the air path diagram of the lower coil channel of this utility model; Figure 11 This is a gas path diagram of the upper coil channel of this utility model; Figure 12 This is the air circuit diagram of the adapter block of this utility model; Figure 13 This is a cross-sectional view of the gas path of the carbon dioxide absorption tank of this utility model; Figure 14 This is the gas path diagram of the carbon dioxide absorption tank of this utility model; Figure 15 This is a gas path diagram of the oxygen concentration adjustment process of this utility model; Figure label: 1. Coil-type gas storage tank; 1-1. Gas storage tank; 1-2. Top cover; 1-3. Bottom cover; 1-4. Upper coil passage; 1-5. Lower coil passage; 1-6. Coil partition; 1-7. Exhalation passage; 1-8. Inhalation passage; 1-9. Exhalation connector; 1-10. Inhalation connector; 1-11. Drive gas connector; 1-12. Connecting port; 1-13. Inhalation safety valve; 1-14. Oxygen concentration sensor; 1-15. Upper sealing gasket; 1-16. Lower sealing gasket; 1-17. Check valve; 2. Adapter block; 2-1. Carbon dioxide absorber installation cavity; 2-2. Carbon dioxide absorber inlet channel; 2-3. Carbon dioxide absorber outlet channel; 2-4. Carbon dioxide absorber inlet insertion hole; 2-5. Carbon dioxide absorber outlet insertion hole; 2-6. Installation groove; 2-7. Fresh gas connector; 2-8. Oxygen concentration regulating valve; 2-8-1. First valve port; 2-8-2. Second valve port; 2-8-3. Third valve port; 2-9. Waste discharge port; 2-10. Waste discharge port connection channel; 3. Carbon dioxide absorption tank; 3-1. Absorption tank body; 3-2. Middle partition; 3-3. Carbon dioxide absorption tank inlet; 3-4. Upper partition; 3-5. Carbon dioxide absorption tank outlet; 3-6. Bottom screen; 3-7. Bottom plate; 3-8. Carbon dioxide absorption tank cover; 3-9. Side screen; 3-10. Mounting boss; 3-11. Handle. Detailed Implementation

[0016] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0017] Example 1 like Figure 1-2As shown, a breathing gas circulation and oxygen recovery device for a field emergency ventilator is disclosed. The device includes a coil-type gas storage tank 1, an adapter block 2, and a carbon dioxide absorption tank 3. The coil-type gas storage tank 1 is connected to the carbon dioxide absorption tank 3 via the adapter block 2. like Figure 3-5 As shown, the coil-type gas storage tank 1 includes a gas storage tank body 1-1, an upper cover 1-2, and a lower cover 1-3. The gas storage tank body 1-1 is provided with an upper coil channel 1-4, a lower coil channel 1-5, an exhalation channel 1-7, and an inhalation channel 1-8. The upper coil channel 1-4 and the lower coil channel 1-5 are separated by a coil partition 1-6. The upper cover 1-2 closes the upper coil channel 1-4, and the lower cover 1-3 closes the lower coil channel 1-5. The outlet of the upper coil channel 1-4 is connected to the exhalation channel 1-7; the exhalation channel 1-7 is connected to the exhalation connector 1-9 through a one-way valve; The air inlet of the upper coil channel 1-4 is connected to the air outlet of the lower coil channel 1-5 through the connecting port 1-12, and the air inlet of the lower coil channel 1-5 is connected to the drive air connector 1-11. like Figure 6-9 As shown, the adapter block 2 is provided with a carbon dioxide absorption canister installation cavity 2-1, a carbon dioxide absorption canister inlet channel 2-2, and a carbon dioxide absorption canister outlet channel 2-3. The carbon dioxide absorption canister inlet channel 2-2 is connected to the exhalation channel 1-7 and is connected to the carbon dioxide absorption canister inlet 3-3 through the carbon dioxide absorption canister inlet insertion hole 2-4. The carbon dioxide absorption canister outlet channel 2-3 is connected to the carbon dioxide absorption canister outlet 3-5 through the carbon dioxide absorption canister outlet insertion hole 2-5 and is connected to the inhalation channel 1-8. The inhalation channel 1-8 is connected to the inhalation connector 1-10 through the one-way valve 1-17. The carbon dioxide absorption tank outlet channel 2-3 is also connected to the fresh gas connector 2-7; An oxygen concentration regulating valve 2-8 and a waste discharge port 2-9 are installed at the lower end of the inlet channel 2-2 of the carbon dioxide absorption tank. The oxygen concentration regulating valve 2-8 has a first valve port 2-8-1, a second valve port 2-8-2, and a third valve port 2-8-3. The first valve port 2-8-1 is connected to the inlet port 3-3 of the carbon dioxide absorption tank, and the second valve port 2-8-2 is connected to the waste discharge port connecting channel 2-10. The oxygen concentration regulating valve 2-8 is a normally closed valve. When not energized, the second valve port 2-8-2 is connected to the third valve port 2-8-3, and the first valve port 2-8-1 is in a closed state. When energized, the first valve port 2-8-1 and the second valve port 2-8-2 are connected. At this time, the gas in the carbon dioxide absorption tank 3 enters the waste discharge port 2-9 through the first valve port 2-8-1. The carbon dioxide absorption tank 3 includes an absorption tank body 3-1, in which a middle partition 3-2 is provided to divide the absorption tank body 3-1 into a left chamber and a right chamber. A carbon dioxide absorption tank inlet 3-3 is provided at the upper part of the left chamber, and an upper partition 3-4 is provided in front of the carbon dioxide absorption tank inlet 3-3. A carbon dioxide absorption tank outlet 3-5 is provided at the lower part of the right chamber. A bottom screen 3-6 is provided at a certain height from the bottom plate 3-7 at the bottom of the left and right chambers. The absorption tank body 3-1, with side plates provided relative to the carbon dioxide absorption tank inlet 3-3 and the carbon dioxide outlet, is open. This openness is closed by a carbon dioxide absorption tank cover 3-8, and a side screen is provided between the carbon dioxide absorption tank cover 3-8 and the absorption tank body 3-1. The air intake channel 1-8 is equipped with an air intake safety valve 1-13 and an oxygen concentration sensor 1-14.

[0018] An upper sealing gasket 1-15 is provided between the gas storage tank 1-1 and the upper cover 1-2, and a lower sealing gasket 1-16 is provided between the gas storage tank 1-1 and the lower cover 1-3.

[0019] The upper coil channel 1-4 and the lower coil channel 1-5 are elliptical in shape, and the gas storage tank 1-1 is rectangular. The elliptical upper coil channel 1-4 and the lower coil channel 1-5 are set inside the gas storage tank 1-1 and separated by the coil partition 1-6, and are integrally formed.

[0020] On the side wall of the adapter block 2 of the carbon dioxide absorption tank mounting cavity 2-1, a mounting groove 2-6 for the carbon dioxide absorption tank 3 is provided, and a mounting boss 3-10 is provided at the corresponding position on the carbon dioxide absorption tank 3.

[0021] A handle 3-11 is provided on the outer side of the lid 3-8 of the carbon dioxide absorption tank.

[0022] On the mounting surfaces of the adapter block 2 and the coil-type gas storage tank 1, the carbon dioxide absorption tank inlet channel 2-2 is arc-shaped, and the carbon dioxide absorption tank outlet channel 2-3 is elongated. One end of the carbon dioxide absorption tank inlet channel 2-2 is flush with one end of the carbon dioxide absorption tank outlet channel 2-3, and the other end of the carbon dioxide absorption tank inlet channel 2-2 is close to the other end of the carbon dioxide absorption tank outlet channel 2-3.

[0023] The coil volume of the coil-type gas storage tank 1 is designed to be 1.2L.

[0024] The carbon dioxide absorption tank 3 is square in shape.

[0025] The volume of the carbon dioxide absorption tank 3 is 0.6L.

[0026] The respiratory gas circulation and oxygen recovery device of this utility model mainly includes three parts: a coil-type gas storage tank 1, a connecting block 2, and a carbon dioxide absorption tank 3. The coil-type gas storage tank 1 is used to store the gas exhaled by the patient. The connecting block 2 is an intermediate body connecting the coil-type gas storage tank and the carbon dioxide absorption tank 3. The carbon dioxide absorption tank 3 can be filled with carbon dioxide absorbent to absorb carbon dioxide in the gas.

[0027] The oxygen recovery device is equipped with an inhalation connector 1-10 and an exhalation connector 1-9, both connected to the patient. A one-way valve 1-17 is installed inside each connector. When the patient inhales, the one-way valve 1-17 in the exhalation connector 1-9 closes; when the patient exhales, the one-way valve 1-17 in the inhalation connector 1-10 closes, ensuring unidirectional gas flow. An oxygen concentration sensor 1-14 is installed between the inhalation connector 1-10 and the exhalation connector 1-9. The sampling point of the oxygen concentration sensor 1-14 is located within the inhalation channel 1-8 connected to the inhalation connector 1-10, and is used to collect real-time data on the patient's inhalation. The oxygen concentration of the gas; an inspiratory safety valve 1-13 is installed on the side of the inspiratory channel 1-8, which is at a 90-degree angle to the axis of the inspiratory connector 1-10 and close to the inspiratory connector 1-10. The inspiratory safety valve 1-13 is a one-way valve. When the patient inhales, if the ventilator airway is blocked or a component malfunctions and cannot provide sufficient tidal volume, the negative pressure generated near the inspiratory connector 1-10 due to the patient's inhalation will open the inspiratory safety valve 1-13, allowing the patient to inhale gas from the air without suffocation; the rear end of the lower coil channel 1-5 has a drive gas connector 1-11, which is used to connect to the drive gas provided by the turbine on the ventilator.

[0028] The coil-type gas storage tank 1 is the structural support carrier of the entire oxygen recovery device. The inhalation connector 1-10, exhalation connector 1-9, oxygen concentration sensor 1-14, drive gas connector 1-11, and adapter block 2 are all mounted on the coil-type gas storage tank. The upper cover 1-2 and lower cover 1-3 of the coil-type gas storage tank have threaded holes for connection to the ventilator housing, and are fixed to the ventilator housing with screws. The main body of the coil-type gas storage tank 1 is divided into an upper coil channel 1-4 and a lower coil channel 1-5, with a connecting port 1- between the two channels. 12. Used to store the patient's exhaled gas. To ensure the overall structure is compact and meets the normal tidal volume (500-700ml) requirement of adults, the coil volume of the upper coil channel 1-4 and the lower coil channel 1-5 is designed to be 1.2L. Tests have shown that when the tidal volume is <1000ml, the oxygen concentration in the patient's inspiratory channel 1-8 can reach more than 90% after oxygen recovery. When the tidal volume is >1500ml, the oxygen concentration in the patient's inspiratory channel 1-8 can also reach more than 60% after oxygen recovery.

[0029] The adapter block 2 is installed at the lower end of the coil-type gas storage tank 1, which serves to connect the gas path of the coil-type gas storage tank with the gas path of the carbon dioxide absorption tank 3. The adapter block 2 is provided with a mounting groove 2-6 for the carbon dioxide absorption tank 3. The mounting boss 3-10 on the carbon dioxide absorption tank 3 can slide along the mounting groove 2-6 and be inserted into the insertion holes of the carbon dioxide absorption tank inlet 3-3 and the carbon dioxide absorption tank outlet 3-5. After being inserted into place, the spring fixing mechanism on the adapter block 2 can fix the carbon dioxide absorption tank 3, thereby providing support and fixation for the carbon dioxide absorption tank 3.

[0030] Additionally, a fresh gas connector 2-7 is installed at the lower end of the carbon dioxide absorption tank outlet channel 2-3 on the adapter block 2. This fresh gas connector 2-7 can be connected to oxygen of a certain concentration output from the oxygen generator. Two oxygen concentration regulating valves are installed at the lower end of the carbon dioxide absorption tank inlet channel 2-2. A waste outlet 2-9 is provided at the lower end of the oxygen concentration regulating valve 2-8 and connected to the two oxygen concentration regulating valves 2-8, which can quickly reduce the oxygen concentration in the system's airway.

[0031] The two oxygen concentration regulating valves have the same connection channels and working principle, specifically, as follows: Figure 7 As shown, the connection channel and working principle of an oxygen concentration regulating valve 2-8 are as follows: The first valve port 2-8-1 is connected to the inlet port 3-3 of the carbon dioxide absorption tank, and the second valve port 2-8-2 is connected to the exhaust port 2-9. The oxygen concentration regulating valve 2-8 is a normally closed valve; when not energized, it is in the closed state. At this time, the second valve port 2-8-2 is connected to the third valve port, and the first valve port 2-8-1 is in a sealed state. After energization, the oxygen concentration regulating valve opens, and the first valve port 2-8-1 is connected to the second valve port 2-8-2. At this time, the gas in the carbon dioxide absorption tank 3 can enter the exhaust port 2-9 channel through the first valve port 2-8-1 and then be discharged from the exhaust port 2-9. The gas path is as follows. Figure 15 As shown, the gas flow direction is indicated by the red arrow.

[0032] The carbon dioxide absorption canister 3 is installed on the adapter block 2 via a horizontal insertion method. Disassembly is simple: just pull the handle on the canister cover 3-8 to remove the canister 3. The canister body 3-1, the partition, and the canister cover 3-8 are made of highly transparent material, allowing clear observation of the carbon dioxide absorbent's usage inside the canister. The canister body has an upper partition 3-4 and a middle partition 3-2 inside its internal cavity. The middle partition 3-2 increases the gas flow length, facilitating the exchange of carbon dioxide and absorbent. The reaction time is reduced to improve adsorption efficiency. The upper baffle 3-4 prevents gas from flowing directly from the inlet to the outlet through the gap near the top of the absorption tank after entering through the inlet. The inlet and outlet on the absorption tank body 3-1 are arranged one above the other, and their function is the same as that of the upper baffle 3-4. At the bottom of the absorption tank body 3-1, there is a bottom screen 3-6 structure. The bottom screen 3-6 can filter the dust inside the carbon dioxide absorbent through the small holes on the screen to the bottom. At the same time, it can also separate the water produced after the carbon dioxide absorbent reacts with carbon dioxide, so as not to affect the gas flow.

[0033] The carbon dioxide absorption tank 3 is designed with a volume of 0.6L, which can meet the needs of more than 3 hours of use. The quick-disassembly structure supports rapid replacement during use.

[0034] The volume of the coiled gas storage tank and carbon dioxide absorption tank 3 mentioned in this utility model is the best combination that balances the compact structure and usage requirements. Other structural volume designs are also feasible. In addition, the cross-sectional shape of the carbon dioxide absorption tank 3 in this utility model is rectangular, but other cross-sectional shapes are also feasible. The carbon dioxide absorbent filled inside can be of various forms, such as commonly used soda lime, calcium lime, and lithium hydroxide absorbent used in diving and aerospace fields.

[0035] The working process of this utility model can be as follows: like Figure 10-14 As shown, when the patient inhales, the gas flow is as indicated by the red arrows. The driving gas enters the lower coil channel 1-5 of the coil-type gas storage tank 1 from the driving gas connector 1-11, then enters the upper coil channel 1-4 through the connecting port 1-12, and then enters the carbon dioxide absorption tank inlet channel 2-2 on the adapter block 2 through the exhalation channel 1-7. After entering the carbon dioxide absorption tank 3, the carbon dioxide in the gas is absorbed and removed by the carbon dioxide absorbent, and then enters the carbon dioxide absorption tank outlet channel 2-3. In addition, the fresh gas output from the oxygen concentrator enters the carbon dioxide absorption tank outlet channel 2-3 directly from the fresh gas connector 2-7. The two gas streams are mixed and delivered to the patient together from the inhalation connector 1-10. like Figure 10-12As shown, when the patient exhales, the gas flow direction is as indicated by the green arrow. The one-way valve 1-17 of the exhalation connector 1-9 opens. At this time, the driving gas and fresh gas stop being delivered. The patient's exhaled gas enters the upper coil channel 1-4 from the exhalation connector 1-9, and enters the lower coil channel 1-5 through the connecting port 1-12. The original driving gas in the coil-type gas tank is squeezed out and discharged from the driving gas connector 1-11. Oxygen concentration adjustment process: When it is necessary to increase the oxygen concentration during the patient's inhalation, the oxygen concentrator operates at maximum power to generate oxygen. High-concentration oxygen enters from the fresh gas connector 2-7 into the carbon dioxide absorption tank outlet channel 2-3 inside the adapter block 2. The oxygen concentration regulating valve 2-8 is closed. The patient's exhaled air enters the coil-type gas storage tank. During inhalation, carbon dioxide is removed by the carbon dioxide absorption tank 3 and mixed with fresh air before being delivered to the patient, thus achieving oxygen recovery and reuse. The patient's exhalation and inhalation processes are as follows: Figure 10-14 As shown.

[0036] When it is necessary to reduce the oxygen concentration in the system, the oxygen concentration regulating valve 2-8 opens when the patient exhales. A portion of the patient's exhaled gas no longer enters the coil for recovery, but is directly discharged into the atmosphere from the lower exhaust port 2-9. The gas path is as follows: Figure 15 As shown, the gas flow direction is indicated by the red arrow; turning off the oxygen generator stops the supply of fresh gas, and the oxygen concentration inside the system can be quickly reduced by decreasing the oxygen supply and the amount of oxygen recovered.

[0037] For any content not described in detail in this utility model, conventional technical knowledge in the field can be used.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model do not depart from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A breathing gas circulation and oxygen recovery device for a field emergency ventilator, characterized in that, The device includes a coil-type gas storage tank, a transfer block, and a carbon dioxide absorption tank; the coil-type gas storage tank is connected to the carbon dioxide absorption tank via the transfer block. The coil-type gas storage tank is equipped with a coil channel, an exhalation channel, and an inhalation channel; The air outlet of the coil channel is connected to the exhalation channel; the air inlet of the coil channel is connected to the drive air connector. The adapter block is provided with a carbon dioxide absorption tank installation cavity, a carbon dioxide absorption tank inlet channel, and a carbon dioxide absorption tank outlet channel; the carbon dioxide absorption tank is installed in the carbon dioxide absorption tank installation cavity, the carbon dioxide absorption tank inlet channel is connected to the exhalation channel and connected to the waste outlet via an oxygen concentration regulating valve, and the carbon dioxide absorption tank outlet channel is connected to the inhalation channel and the fresh gas connector. The carbon dioxide absorption tank includes an absorption tank body, in which a carbon dioxide absorption tank inlet and a carbon dioxide absorption tank outlet are provided; the carbon dioxide absorption tank inlet is connected to a carbon dioxide absorption tank inlet channel, and the carbon dioxide absorption tank outlet is connected to a carbon dioxide absorption tank outlet channel.

2. The breathing gas circulation and oxygen recovery device for a field emergency ventilator according to claim 1, characterized in that, The coil channel is installed in the gas storage tank and is divided into an upper coil channel and a lower coil channel. The upper coil channel and the lower coil channel are separated by a coil partition. The air inlet of the upper coil channel is connected to the air outlet of the lower coil channel through a connecting port. The air outlet of the upper coil channel is connected to the exhalation channel, and the air inlet of the lower coil channel is connected to the drive air connector.

3. The breathing gas circulation and oxygen recovery device for a field emergency ventilator according to claim 2, characterized in that, The coil-type gas storage tank also includes an upper cover and a lower cover. An upper sealing gasket is provided between the gas storage tank body and the upper cover, and a lower sealing gasket is provided between the gas storage tank body and the lower cover.

4. The breathing gas circulation and oxygen recovery device for a field emergency ventilator according to claim 1, characterized in that, The exhalation channel is connected to the exhalation connector via a one-way valve, and the inhalation channel is connected to the inhalation connector via a one-way valve.

5. The breathing gas circulation and oxygen recovery device for a field emergency ventilator according to claim 1, characterized in that, The adapter block is also provided with a carbon dioxide absorption tank inlet plug hole and a carbon dioxide absorption tank outlet plug hole; the carbon dioxide absorption tank inlet channel is connected to the carbon dioxide absorption tank inlet through the carbon dioxide absorption tank inlet plug hole; the carbon dioxide absorption tank outlet channel is connected to the carbon dioxide absorption tank outlet through the carbon dioxide absorption tank outlet plug hole.

6. The breathing gas circulation and oxygen recovery device for a field emergency ventilator according to claim 1, characterized in that, The absorber tank body is equipped with a middle partition, which divides the absorber tank body into a left chamber and a right chamber. The upper part of the left chamber is provided with the carbon dioxide absorber tank inlet, and an upper partition is provided in front of the carbon dioxide absorber tank inlet. The lower part of the right chamber is provided with the carbon dioxide absorber tank outlet. Bottom screens are provided at a certain height from the bottom plate at the bottom of the left and right chambers. The absorber tank body with side plates relative to the carbon dioxide absorber tank inlet and outlet is open. This openness is closed by the carbon dioxide absorber tank cover. A side screen is provided between the carbon dioxide absorber tank cover and the absorber tank body.

7. The breathing gas circulation and oxygen recovery device for a field emergency ventilator according to claim 1, characterized in that, An oxygen concentration regulating valve and a waste discharge port are provided at the lower end of the air inlet channel of the carbon dioxide absorption tank. The oxygen concentration regulating valve has a first valve port, a second valve port, and a third valve port. The first valve port is connected to the air inlet of the carbon dioxide absorption tank, and the second valve port is connected to the waste discharge port. The oxygen concentration regulating valve is a normally closed valve. When not energized, the second valve port is connected to the third valve port, and the first valve port is closed. When energized, the first valve port and the second valve port are connected, allowing the gas in the carbon dioxide absorption tank to enter the waste discharge port through the first valve port and be discharged.

8. The breathing gas circulation and oxygen recovery device for a field emergency ventilator according to claim 1, characterized in that, The air intake channel is equipped with an air intake safety valve and an oxygen concentration sensor.

9. The breathing gas circulation and oxygen recovery device for a field emergency ventilator according to claim 1, characterized in that, The carbon dioxide absorption tank mounting cavity has a mounting groove for the carbon dioxide absorption tank on the side wall of the transition block, and a mounting boss is provided at the corresponding position on the carbon dioxide absorption tank.

10. The breathing gas circulation and oxygen recovery device for a field emergency ventilator according to claim 1, characterized in that, The coil-type gas storage tank is designed with a coil volume of 1.2L, and the carbon dioxide absorption tank has a volume of 0.6L.

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