Gas circuit structure of breathing machine

Abstract

The invention belongs to the technical field of medical equipment, and particularly discloses an air path structure of a breathing machine, which comprises an oxygen supply branch, an air supply branch, an air-oxygen mixing through pipe and an air-oxygen output branch, the oxygen supply branch is provided with a first airflow gentle assembly and a first flow meter, and the air supply branch is provided with a second airflow gentle assembly and a second flow meter. The air and oxygen output branch is provided with a third flow meter, a third airflow gentle assembly and a fourth airflow gentle assembly; and oxygen and air are mixed in the air-oxygen mixing through pipe. The oxygen supply branch, the air supply branch and the air and oxygen output branch are provided with corresponding airflow gentle assemblies, stress of airflow in the air paths is reduced, turbulent flow of the air paths of the breathing machine is reduced, the airflow is gentle, the flow is stable, the inspiration comfort of a patient is improved, the flow meter is arranged, the flow of each air path is accurately measured and monitored, and therefore the breathing machine works stably.

Description

Technical Field

[0001] The invention belongs to the technical field of medical equipment, and in particular relates to an air path structure of a ventilator. Background Art

[0002] A ventilator is a device that can replace, control or change a person's normal physiological breathing, increase lung ventilation, improve respiratory function, reduce respiratory work consumption, and save heart reserve capacity. Ventilators are commonly used in the treatment of respiratory failure, sleep apnea hypopnea syndrome and other diseases caused by various reasons. They occupy a very important position in the field of modern medicine, and people pay more and more attention to their comfort.

[0003] A ventilator is generally composed of a host, an air source, an air circuit, a humidifier, and external pipes. Currently, mainstream ventilators often use electric means to supply air to patients, that is, a turbine blower is used to provide pressure and flow, and after being processed by components such as the air circuit and humidifier, air is supplied to patients through external pipes. During the air supply process, the host provides respiratory management. The host monitors the air-oxygen mixed gas according to the set parameters, including ventilation volume, pressure, flow, capacity, etc., and monitors the working stability of the ventilator, thereby providing the patient with the best breathing state, which can achieve twice the result with half the effort in the patient's recovery.

[0004] However, flow rate, one of the monitoring parameters, is affected by factors such as airflow velocity, airflow form, and flow path size of the air path structure. The airflow is prone to form turbulence, which affects the flow meter's inaccurate measurement, resulting in poor working stability of the ventilator and affecting the patient's inhalation comfort. Summary of the invention

[0005] The purpose of the present invention is to provide an air path structure of a ventilator, which reduces turbulence in the air path of the ventilator, makes the air flow smooth and the flow rate stable, thereby improving the comfort of the patient's inhalation; and the flow meter accurately measures and monitors the air path flow, and the ventilator works stably.

[0006] The object of the present invention is achieved through such a technical solution, a gas circuit structure of a ventilator, comprising:

[0007] The oxygen supply branch includes a high-pressure proportional valve, a first air flow smoothing component and a first flow meter, a first oxygen passage pipe and a second oxygen passage pipe; the high-pressure proportional valve is connected to an external oxygen supply device to control the oxygen inlet ratio; one end of the first oxygen passage pipe is connected to the high-pressure proportional valve, and the other end is connected to one end of the first flow meter, and the first air flow smoothing component is arranged in the first oxygen passage pipe; one end of the second oxygen passage pipe is connected to the other end of the first flow meter;

[0008] The air supply branch includes a turbo fan, a second air flow smoothing component, an air passage and a second flow meter; the turbo fan is provided with an air inlet, one end of the second flow meter is connected to the turbo fan, and the other end is connected to one end of the second air flow smoothing component, and the other end of the second air flow smoothing component is connected to the air passage;

[0009] an air-oxygen mixing pipe, one end of which is connected to the second oxygen pipe and the air pipe respectively; and

[0010] The air-oxygen output branch includes an air-oxygen output pipe, a third air flow smoothing component, a fourth air flow smoothing component and a third flow meter. One end of the third flow meter is connected to the air-oxygen mixing pipe, and the other end of the third flow meter is connected to the air-oxygen output pipe. The air-oxygen output pipe is provided with an air outlet. The third air flow smoothing component and the fourth air flow smoothing component are arranged at intervals in the air-oxygen output pipe.

[0011] Preferably, the first air flow smoothing component includes two groups of first honeycomb cores, which are respectively arranged at intervals in the first oxygen passage pipe; the second air flow smoothing component includes a first porous guide plate and a buffer tube, one end of the buffer tube is connected to the second flow meter, and the other end is connected to the air passage pipe, and the first porous guide plate is installed in the middle of the buffer tube; the third air flow smoothing component is the second honeycomb core, and the second honeycomb core is installed at one end of the air-oxygen output passage pipe and close to the air-oxygen mixing passage pipe; the fourth air flow smoothing component is the second porous guide plate, and the second porous guide plate is installed at one end of the air-oxygen output passage pipe close to the air outlet.

[0012] Preferably, the middle portion of the buffer tube is cylindrical, and the buffer tube is provided with an inner cavity, and the inner diameter of the inner cavity gradually decreases from the middle portion of the buffer tube to the two ends.

[0013] Preferably, the first porous guide plate is provided with a plurality of guide holes of equal aperture, wherein one guide hole is arranged at the center of the first porous guide plate, and the remaining guide holes are evenly spaced along the circumference of the first porous guide plate.

[0014] Preferably, the air-oxygen mixing tube is tilted and provided with a first stirring plate and a second stirring plate, the first stirring plate and the second stirring plate are provided with semicircular through holes, and the first stirring plate and the second stirring plate are spaced apart in the air-oxygen mixing tube.

[0015] Preferably, the semicircular through hole of the first stirring plate and the semicircular through hole of the second stirring plate are arranged in a staggered manner.

[0016] Preferably, bosses are provided at both ends of the air-oxygen mixing tube, and the first stirring plate and the second stirring plate are respectively provided with grooves matching with the corresponding bosses, and the bosses are embedded in the grooves.

[0017] Preferably, the air duct includes an air duct body, a bent pipe, and a connecting pipe. One end of the air duct body is connected to the second air flow smoothing component, and the other end is connected to one end of the bent pipe. The other end of the bent pipe is connected to one end of the connecting pipe, and the other end of the connecting pipe is connected to the air-oxygen mixing duct.

[0018] Preferably, the inner diameter of the air-oxygen output conduit is larger than the inner diameter of the air-oxygen mixing conduit.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] The air circuit structure of the above-mentioned ventilator is provided with corresponding air flow smoothing components in the oxygen supply branch, the air supply branch, and the air-oxygen output branch, respectively, so as to reduce the air flow turbulence in the air circuit of the ventilator, make the air flow smoother, and the flow rate stable, thereby improving the patient's inhalation comfort; a flow meter is provided in each air circuit branch to accurately monitor the flow rate of the branch, so that the ventilator works stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a structural schematic diagram of an air path structure of a ventilator of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the oxygen supply branch;

[0024] Figure 3 This is a schematic diagram of the air supply branch;

[0025] Figure 4 It is a structural schematic diagram of the air-oxygen mixing pipe;

[0026] Figure 5 This is a schematic diagram of the air and oxygen output branch;

[0027] Figure 6 This is a schematic diagram of the first honeycomb core structure.

[0028] Reference numerals:

[0029] 1- oxygen supply branch, 11- high pressure proportional valve, 12- first air flow smoothing component, 121- first honeycomb core, 13- first flow meter, 14- first oxygen passage pipe, 15- second oxygen passage pipe,

[0030] 2-air supply branch, 21-turbine fan, 211-air inlet, 22-second air flow smoothing component, 221-first porous guide plate, 222-buffer box, 223-guide hole, 23-air passage, 231-air passage body, 232-elbow, 233-connecting pipe, 24-second flow meter,

[0031] 3-air-oxygen mixing tube, 31-first stirring plate, 32-second stirring plate, 33-semicircular through hole, 34-boss, 35-groove,

[0032] 4-air and oxygen output branch, 41-air and oxygen output pipe, 411-air outlet, 42-third air flow smoothing component, 43-fourth air flow smoothing component, 431-second porous guide plate, 44-third flow meter. DETAILED DESCRIPTION

[0033] See also Figures 1 to 5 , a gas circuit structure of a ventilator, comprising: an oxygen supply branch 1, an air supply branch 2, an air-oxygen mixing pipe 3 and an air-oxygen output branch 4.

[0034] The oxygen supply branch 1 includes a high-pressure proportional valve 11, a first air flow smoothing component 12 and a first flow meter 13, a first oxygen passage 14 and a second oxygen passage 15; the high-pressure proportional valve 11 is connected to an external oxygen supply device to control the oxygen inlet ratio; one end of the first oxygen passage 14 is connected to the high-pressure proportional valve 11, and the other end is connected to one end of the first flow meter 13, and the first air flow smoothing component 12 is arranged in the first oxygen passage 14; one end of the second oxygen passage 15 is connected to the other end of the first flow meter 13. The air supply branch 2 includes a turbo fan 2121, a second air flow smoothing component 22, an air passage 23 and a second flow meter 24; the turbo fan 21 is provided with an air inlet 211, one end of the second flow meter 24 is connected to the turbo fan 21, and the other end is connected to one end of the second air flow smoothing component 22, and the other end of the second air flow smoothing component 22 is connected to the air passage 23. One end of the air-oxygen mixing passage 3 is connected to the second oxygen passage 15 and the air passage 23 respectively. The air-oxygen output branch 4 includes an air-oxygen output pipe 41, a third air flow smoothing component 42, a fourth air flow smoothing component 43 and a third flow meter 44. One end of the third flow meter 44 is connected to the air-oxygen mixing pipe 3, and the other end of the third flow meter 44 is connected to the air-oxygen output pipe 41. The air-oxygen output pipe 41 is provided with an air outlet 411. The third air flow smoothing component 42 and the fourth air flow smoothing component 43 are arranged at intervals in the air-oxygen output pipe 41.

[0035] Specifically, the high-pressure proportional valve 11 is connected to an external high-pressure oxygen device, such as an oxygen cylinder, and the pressure and flow of the oxygen are adjusted by the high-pressure proportional valve 11. The adjusted oxygen enters the first oxygen passage 14 equipped with the first air flow smoothing component 12, and is buffered by the first air flow smoothing component 12 to buffer the stress of the oxygen air flow. The first flow meter 13 measures and monitors the oxygen flow rate, and the oxygen enters the second oxygen passage 15. Ordinary air from the outside enters through the air inlet 211, and enters the second flow meter 24 after being compressed by the turbine fan 21. The second flow meter 24 measures and monitors the flow rate of the compressed air. The compressed air enters the air passage 23 through the second air flow smoothing component 22 to buffer the stress of the air flow. The air passage 23 and the second oxygen passage 15 are respectively connected to the input end of the air-oxygen mixing passage 3, and the air and oxygen are fully mixed in the air-oxygen mixing passage 3. The air-oxygen mixed gas passes through the third flow meter 44, which measures and monitors its flow rate, and passes through the third air flow smoothing component 42 and the fourth air flow smoothing component 43 to obtain buffered air-oxygen gas, which is output from the gas outlet 411 for use by the patient. Preferably, the first flow meter 13, the second flow meter 24 and the third flow meter are all of model SFM3119, and the turbine blower 21 is of model C65MS1.

[0036] In the air circuit structure of a ventilator in the present invention, the oxygen supply branch 1 and the air supply branch 2 are independently set, and they can be buffered and adjusted separately, and their parameters can be monitored separately, so that the staff can adjust the oxygen flow of the oxygen supply branch 1 and the air flow of the air supply branch 2 with high precision, so as to achieve accurate control of the output flow and oxygen concentration. An air flow smoothing component and a flow meter are respectively set in the oxygen supply branch 1, the air supply branch 2 and the air-oxygen output branch 4, and each air circuit branch is monitored in real time to reduce air flow stress, reduce turbulence, and make the air flow in the air circuit smooth, so that the ventilator works stably, and the air-oxygen output branch 4 outputs a smooth airflow, which improves the comfort of the patient.

[0037] See also Figures 2 to 5 Furthermore, the first air flow smoothing component 12 includes two groups of first honeycomb cores 121, which are respectively arranged in the first oxygen duct 14 at intervals; the second air flow smoothing component 22 includes a first porous guide plate 221 and a buffer tube 222, one end of the buffer tube 222 is connected to the second flow meter 24, and the other end is connected to the air duct 23, and the first porous guide plate 221 is installed in the middle of the buffer tube 222; the third air flow smoothing component 42 is a second honeycomb core, and the second honeycomb core is installed at one end of the air-oxygen output duct 41 and close to the air-oxygen mixing duct 3; the fourth air flow smoothing component 43 is a second porous guide plate 431, and the second porous guide plate 431 is installed at one end of the air-oxygen output duct 41 close to the air outlet 411.

[0038] Specifically, the middle part of the buffer tube 222 is cylindrical, and the buffer tube 222 is provided with an inner cavity, and the inner diameter of the inner cavity gradually decreases from the middle part of the buffer tube 222 to the two ends. The first porous guide plate 221 is fixedly installed in the middle part of the cylinder, and cones are symmetrically provided on both sides of the cylinder, and the inner diameter gradually decreases from the cylinder of the buffer tube 222 to the end, and is matched and connected with other components. With this structure, the compressed air flow enters a relatively large space, which is conducive to the buffering of the air flow. The first porous guide plate 221 further guides the air flow, thereby reducing the air flow stress and flow rate. The first flow meter 13 is provided with external threads on both sides, and the turbine fan 21 and the buffer tube 222 are respectively provided with internal threads matching the external threads. The first flow meter 13 is threadedly connected with the turbine fan 21 and the buffer tube 222 respectively. The second porous guide plate 431 adopts the same structure as the first porous guide plate 221. Similarly, it further guides the air-oxygen mixed air flow, so that the air-oxygen mixed gas is output smoothly, and the comfort of the patient's inhalation is improved.

[0039] When the first honeycomb core 121 is subjected to an oxygen flow of a certain pressure, the oxygen flow can be dispersed to each honeycomb unit, and the flow and stress can be relieved, thereby avoiding excessive stress concentration of the oxygen flow and reducing the stress and flow rate of the oxygen flow. The second honeycomb core adopts the same structure as the first honeycomb core 121. Similarly, the second honeycomb core reduces the stress and flow rate of the air-oxygen mixed flow. Preferably, the first honeycomb core 121 and the second honeycomb core are made of aluminum, and each honeycomb unit is polygonal.

[0040] See also Figure 3 , further, the first porous guide plate 221 is provided with a plurality of guide holes 223 of equal aperture, wherein one guide hole 223 is arranged at the center of the first porous guide plate 221, and the other guide holes 223 are evenly spaced along the circumference of the first porous guide plate 221. Specifically, the centers of the guide holes 223 arranged at intervals are on the same circumference. The diameter of the guide holes 223 depends on the size of the first porous guide plate 221. Preferably, there are 9 guide holes 223, wherein 1 is arranged at the center of the first porous guide plate 221, and the other 8 are evenly spaced along the circumference of the first porous guide plate 221. With this structure, air gas flows out from each guide hole 223, thereby changing the original state of the gas in the middle of the through pipe with a fast speed and a slow speed at the edge to a uniform distribution along the radial direction of the through pipe, with a stable flow rate, reducing the flow measurement error, and improving the performance of the ventilator.

[0041] The second porous guide plate 431 has the same structure as the first porous guide plate 221 .

[0042] See also Figure 1 and Figure 4Further, the air-oxygen mixing tube 3 is tilted, and is provided with a first stirring plate 31 and a second stirring plate 32. The first stirring plate 31 and the second stirring plate 32 are provided with a semicircular through hole 33. The first stirring plate 31 and the second stirring plate 32 are arranged at intervals in the air-oxygen mixing tube 3. The air-oxygen mixing tube 3 is tilted, which increases the length of the air-oxygen mixing tube 3, so that the air and oxygen are fully mixed. The first stirring plate 31 and the second stirring plate 32 are provided with a semicircular through hole 33, and the air-oxygen mixture flows through the semicircular through hole 33, and the air flow rate through the space becomes smaller, so that the oxygen and air are fully mixed.

[0043] See also Figure 4 Furthermore, the semicircular through hole 33 of the first stirring plate 31 is staggered with the semicircular through hole 33 of the second stirring plate 32. The gas passes through the air-oxygen mixing tube 3 in an "S" shape, and oxygen and air are fully mixed.

[0044] See also Figure 4 Furthermore, bosses 34 are provided at both ends of the air-oxygen mixing tube 3, and the first stirring plate 31 and the second stirring plate 32 are respectively provided with grooves 35 that match the corresponding bosses 34, and the bosses 34 are embedded in the grooves 35. With this structure, the first stirring plate 31 and the second stirring plate 32 are prevented from rotating in the air-oxygen mixing tube 3, and the gas turbulence caused by the rotation of the first stirring plate 31 and the second stirring plate 32 is avoided, thereby improving the stability of the air flow.

[0045] See also Figure 3 Further, the air passage 23 includes an air passage body 231, an elbow 232, and a connecting pipe 233. One end of the air passage body 231 is connected to the second air flow smoothing component 22, and the other end is connected to the elbow 232. The other end of the elbow 232 is connected to one end of the connecting pipe 233, and the other end of the connecting pipe 233 is connected to the air-oxygen mixing passage 3. The elbow 232 and the connecting pipe 233 are used to prevent the air flow from directly passing into the air-oxygen mixing passage 3, which can play a rectifying role on the air flow and reduce the collision and turbulence between air in different directions.

[0046] See also Figure 1 Furthermore, the inner diameter of the air-oxygen output pipe 41 is larger than the inner diameter of the air-oxygen mixing pipe 3 .

[0047] The air circuit structure of the above-mentioned ventilator is provided with corresponding air flow smoothing components in the oxygen supply branch 1, the air supply branch 2, and the air-oxygen output branch 4 respectively; a bend pipe 232 is provided to change the flow direction of the air supply branch 2, and the different settings of each branch and inner diameter reduce the turbulence in the air circuit of the ventilator, reduce the stress of the air flow in the branch channel, and make the air flow smooth and the flow rate stable; a flow meter is provided in each branch to accurately monitor the flow of the branch, so that the ventilator works stably and improves the patient's inhalation comfort. Using the air-oxygen mixing tube 3 to replace the conventional air-oxygen mixer not only saves material costs, but also makes the ventilator smaller.

[0048] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas path structure of a ventilator, characterized in that: include: The oxygen supply branch (1) comprises a high-pressure proportional valve (11), a first air flow smoothing component (12) and a first flow meter (13), a first oxygen passage pipe (14) and a second oxygen passage pipe (15); the high-pressure proportional valve (11) is connected to an external oxygen supply device and is used to control the oxygen intake ratio; one end of the first oxygen passage pipe (14) is connected to the high-pressure proportional valve (11), and the other end is connected to one end of the first flow meter (13); the first air flow smoothing component (12) is arranged in the first oxygen passage pipe (14); one end of the second oxygen passage pipe (15) is connected to the other end of the first flow meter (13); The air supply branch (2) comprises a turbo fan (21), a second air flow smoothing component (22), an air passage (23) and a second flow meter (24); the turbo fan (21) is provided with an air inlet (211); one end of the second flow meter (24) is in communication with the turbo fan (21), and the other end is in communication with one end of the second air flow smoothing component (22); and the other end of the second air flow smoothing component (22) is in communication with the air passage (23); An air-oxygen mixing passage (3), one end of which is respectively connected to the second oxygen passage (15) and the air passage (23); as well as The air-oxygen output branch (4) comprises an air-oxygen output pipe (41), a third air flow smoothing component (42), a fourth air flow smoothing component (43) and a third flow meter (44); one end of the third flow meter (44) is connected to the air-oxygen mixing pipe (3); the other end of the third flow meter (44) is connected to the air-oxygen output pipe (41); the air-oxygen output pipe (41) is provided with an air outlet (411); the third air flow smoothing component (42) and the fourth air flow smoothing component (43) are arranged in the air-oxygen output pipe (41) at intervals.

2. The air circuit structure of the ventilator according to claim 1, characterized in that: The first air flow smoothing component (12) comprises two groups of first honeycomb cores (121) which are respectively arranged at intervals in the first oxygen passage pipe (14); the second air flow smoothing component (22) comprises a first porous guide plate (221) and a buffer pipe (222); one end of the buffer pipe (222) is connected to the second flow meter (24), and the other end is connected to the air passage pipe (23); the first porous guide plate (221) is installed in the middle of the buffer pipe (222); the third air flow smoothing component (42) is a second honeycomb core, which is installed at one end of the air-oxygen output passage pipe (41) and close to the air-oxygen mixing passage pipe (3); the fourth air flow smoothing component (43) is a second porous guide plate (431), which is installed at one end of the air-oxygen output passage pipe (41) close to the air outlet (411).

3. The air circuit structure of the ventilator according to claim 2, characterized in that: The middle portion of the buffer tube (222) is cylindrical, and the buffer tube (222) is provided with an inner cavity, the inner diameter of which gradually decreases from the middle portion of the buffer tube (222) to the two ends.

4. The air circuit structure of the ventilator according to claim 2 or 3, characterized in that: The first porous guide plate (221) is provided with a plurality of guide holes (223) of equal aperture, wherein one guide hole (223) is arranged at the center of the first guide plate, and the remaining guide holes (223) are evenly spaced along the circumference of the first porous guide plate 221.

5. The air circuit structure of the ventilator according to claim 1, 2 or 3, characterized in that: The air-oxygen mixing tube (3) is arranged obliquely and is provided with a first stirring plate (31) and a second stirring plate (32). The first stirring plate (31) and the second stirring plate (32) are provided with semicircular through holes (33). The first stirring plate (31) and the second stirring plate (32) are arranged in the air-oxygen mixing tube (3) at intervals.

6. The air circuit structure of the ventilator according to claim 5, characterized in that: The semicircular through hole (33) of the first stirring plate (31) and the semicircular through hole (33) of the second stirring plate (32) are arranged in a staggered manner.

7. The air circuit structure of the ventilator according to claim 5, characterized in that: Bosses (34) are provided at both ends of the air-oxygen mixing tube (3), and the first stirring plate (31) and the second stirring plate (32) are respectively provided with grooves (35) that match the corresponding bosses (34), and the bosses (34) are embedded in the grooves (35).

8. The air circuit structure of the ventilator according to claim 6, characterized in that: Bosses (34) are provided at both ends of the air-oxygen mixing tube (3), and the first stirring plate (31) and the second stirring plate (32) are respectively provided with grooves (35) that match the corresponding bosses (34), and the bosses (34) are embedded in the grooves (35).

9. The air circuit structure of the ventilator according to claim 1, 2, 3, 6, 7 or 8, characterized in that: The air passage pipe (23) comprises an air passage pipe body (231), a curved pipe (232), and a connecting pipe (233); one end of the air passage pipe body (231) is connected to the second air flow smoothing component (22), and the other end is connected to one end of the curved pipe (232); the other end of the curved pipe (232) is connected to one end of the connecting pipe (233); and the other end of the connecting pipe (233) is connected to the air-oxygen mixing passage pipe (3).

10. The air circuit structure of a ventilator according to claim 1, 2, 3, 6, 7 or 8, characterized in that: The inner diameter of the air-oxygen output conduit (41) is greater than the inner diameter of the air-oxygen mixing conduit (3).

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