Breathing machine

Abstract

The utility model belongs to the technical field of breathing machines, and particularly relates to a breathing machine which comprises an inspiration air path and an expiration air path, the inspiration air path comprises an oxygen branch, a high-pressure air branch and an inspiration end branch, the oxygen branch and the high-pressure air branch are both connected with the inspiration end branch, the inspiration end branch is used for conveying air-oxygen mixed gas to a patient, and the expiration air path is used for expiration of the patient. The expiration gas circuit is used for exhausting gas generated by breathing of a patient to the outside, the oxygen branch comprises an oxygen source, an oxygen proportional valve, an oxygen flow stabilizing structure, an oxygen flow sensor and a first oxygen one-way valve which are connected in sequence, and the oxygen proportional valve is used for adjusting the flow of oxygen entering the oxygen branch; the oxygen flow stabilizing structure is used for reducing the flow speed of gas coming out of the oxygen proportional valve and conveying the gas subjected to speed reduction to the oxygen flow sensor. The flow speed of oxygen entering the oxygen flow sensor is slow, the influence on the measurement accuracy of the oxygen flow sensor is reduced, and the accuracy of the oxygen flow measured by the oxygen flow sensor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ventilators, and in particular relates to a ventilator. Background Art

[0002] A ventilator is a vital medical device that can prevent and treat respiratory failure, reduce complications, and save and prolong patients' lives.

[0003] An existing ventilator includes an inhalation air circuit and an expiratory air circuit. The inhalation air circuit includes an oxygen branch, an air branch and an inhalation end branch. The oxygen branch and the air branch are evenly connected to the inhalation end branch, which is used to transmit air and oxygen to the inhalation end branch. The inhalation end branch is connected to a patient. The inhalation end branch is used to mix the received air and oxygen, and to deliver the mixed air-oxygen mixed gas to the patient. The expiratory air circuit is connected to the patient to help the patient discharge the gas generated after breathing to the outside.

[0004] In the existing ventilator, the oxygen branch includes an oxygen source, an oxygen proportional valve, an oxygen flow sensor and an oxygen one-way valve which are connected in sequence. Air enters the oxygen branch from the oxygen source. The oxygen proportional valve is used to control the oxygen flow rate and can provide oxygen of different flow rates according to actual needs, thereby adjusting the oxygen concentration. The oxygen flow sensor is used to measure the oxygen flow rate, but the oxygen flow rate coming out of the proportional valve is turbulent. When the rapid gas passes through the flow sensor, the flow rate is unstable, resulting in inaccurate oxygen flow measured by the flow sensor, which in turn causes the oxygen branch to be unable to provide an accurate amount of oxygen, affecting the safety of the patient. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to provide a ventilator for the problem that the oxygen flow rate measured by the flow sensor of the existing ventilator is inaccurate.

[0006] In order to solve the above technical problems, the embodiment of the utility model provides a ventilator, including an inhalation air circuit and an exhalation air circuit, wherein the inhalation air circuit includes an oxygen branch, a high-pressure air branch and an inhalation end branch, wherein the oxygen branch and the high-pressure air branch are both connected to the inhalation end branch, the inhalation end branch is used to deliver air-oxygen mixed gas to the patient, and the exhalation air circuit is used to discharge the gas generated by the patient's breathing to the outside;

[0007] The oxygen branch includes an oxygen source, an oxygen proportional valve, an oxygen flow stabilizing structure, an oxygen flow sensor and a first oxygen one-way valve connected in sequence. The oxygen proportional valve is used to adjust the size of the oxygen flow entering the oxygen branch. The oxygen flow stabilizing structure is used to reduce the flow rate of the gas coming out of the oxygen proportional valve and to transport the reduced-speed gas to the oxygen flow sensor.

[0008] Optionally, the oxygen flow stabilization structure includes a first oxygen filter, which is connected between the oxygen proportional valve and the oxygen flow sensor and is used to filter and reduce the speed of oxygen.

[0009] Optionally, the oxygen branch further includes an oxygen pressure sensor, an oxygen pressure relief valve, an oxygen pressure reducing valve and a second oxygen one-way valve, the oxygen pressure sensor and the oxygen pressure relief valve are connected between the oxygen source and the oxygen proportional valve, the oxygen pressure sensor is used to detect the oxygen pressure in the oxygen branch, the oxygen pressure relief valve is used to quickly reduce the oxygen pressure in the oxygen branch, the second oxygen one-way valve is connected between the oxygen pressure relief valve and the oxygen proportional valve, the oxygen pressure reducing valve is connected between the second oxygen one-way valve and the oxygen proportional valve, and the oxygen pressure reducing valve is used to reduce the oxygen in the oxygen branch to a preset pressure.

[0010] Optionally, the high-pressure air branch includes a high-pressure air source, a high-pressure air proportional valve, an air flow stabilization structure, an air flow sensor and a first high-pressure air one-way valve connected in sequence, the high-pressure air proportional valve is used to adjust the flow rate of high-pressure air entering the high-pressure air branch, the air flow stabilization structure is used to reduce the flow rate of the gas coming out of the high-pressure air proportional valve, and to deliver the reduced-speed gas to the air flow sensor.

[0011] Optionally, the air flow stabilization structure includes a first high-pressure air filter, which is connected between the high-pressure air proportional valve and the air flow sensor and can filter and reduce the speed of the air.

[0012] Optionally, the high-pressure air branch also includes an air pressure sensor, a high-pressure air pressure relief valve, a high-pressure air pressure reducing valve and a second high-pressure air one-way valve, the air pressure sensor and the high-pressure air pressure relief valve are connected between the high-pressure air source and the high-pressure air proportional valve, the air pressure sensor is used to detect the air pressure in the high-pressure air branch, the high-pressure air pressure relief valve is used to quickly reduce the air pressure in the high-pressure air branch, the second high-pressure air one-way valve is connected between the high-pressure air pressure relief valve and the high-pressure air proportional valve, the high-pressure air pressure reducing valve is connected between the second high-pressure air one-way valve and the high-pressure air proportional valve, and the high-pressure air pressure reducing valve is used to reduce the air in the high-pressure air branch to a preset pressure.

[0013] Optionally, the inhalation end branch includes an air-oxygen mixer, an air-oxygen mixed gas flow sensor, an oxygen concentration sensor, an inhalation end pressure sensor and an inhalation port which are connected in sequence, the first oxygen one-way valve is connected to the air-oxygen mixer, the first high-pressure air one-way valve is connected to the air-oxygen mixer, the inhalation port is used to be connected to a patient, the inhalation end pressure sensor is used to detect the patient's inhalation pressure, the oxygen concentration sensor is used to detect the oxygen concentration in the inhalation end branch, and the air-oxygen mixed gas flow sensor is used to detect the flow of the air-oxygen mixed gas in the inhalation end branch.

[0014] Optionally, the inlet end branch also includes an electronic safety valve, which is connected between the air-oxygen mixed gas flow sensor and the oxygen concentration sensor, and is used to open when the gas pressure in the inlet end branch exceeds a limit value to reduce the gas pressure in the inlet end branch.

[0015] Optionally, the exhalation air circuit includes an exhaust port, an exhalation module, a first air resistance and an exhalation port connected in sequence, the exhalation port is used to be connected to the patient, the exhalation module includes an electronic PEEP valve, the electronic PEEP valve is used to adjust the gas pressure value in the exhalation air circuit, and the exhaust port is connected to the outside world for discharging the gas in the exhalation air circuit to the outside world.

[0016] Optionally, the exhalation air circuit also includes a water blowing branch, which includes a two-position three-way valve, an electromagnetic switch valve and a second air resistor connected in sequence, the two-position three-way valve is connected to the oxygen branch and the high-pressure air branch, the second air resistor is connected between the exhalation module and the first air resistor, the electromagnetic switch valve is used to control the on and off of the water blowing branch, and the water blowing branch is used to blow air into the exhalation module.

[0017] According to the ventilator of the embodiment of the utility model, the oxygen flow stabilizing structure can reduce the flow rate of oxygen coming out of the oxygen proportional valve, and can reduce the rapid flow of oxygen to a slow flow gas, so that the flow rate of oxygen entering the oxygen flow sensor is slower, reducing the impact on the measurement accuracy of the oxygen flow sensor, and improving the accuracy of the oxygen flow measured by the oxygen flow sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the air circuit of a ventilator provided in one embodiment of the utility model.

[0019] The accompanying drawings in the specification are marked as follows: 1. Inhalation air circuit; 2. Oxygen branch; 3. Oxygen source; 4. Oxygen pressure sensor; 5. Oxygen pressure relief valve; 6. Second oxygen filter; 7. Second oxygen one-way valve; 8. Oxygen pressure reducing valve; 9. Oxygen proportional valve; 10. First oxygen filter; 11. Oxygen flow sensor; 12. First oxygen one-way valve; 13. High-pressure air branch; 14. High-pressure air source; 15. Air pressure sensor; 16. High-pressure air pressure relief valve; 17. Second high-pressure air filter; 18. Second high-pressure air one-way valve; 19. High-pressure air pressure reducing valve; 20. High-pressure air proportional valve; 21. First high-pressure air filter; 22. Air flow sensor; 23. First high-pressure air one-way valve; 24. Inhalation end branch ; 25. Air-oxygen mixer; 26. Air-oxygen mixed gas flow sensor; 27. Oxygen concentration sensor; 28. Air-oxygen mixed gas pressure sensor; 29. ​​Electronic safety valve; 30. Inhalation port; 31. Low-pressure air branch; 32. Low-pressure air source; 33. Low-pressure air filter; 34. Low-pressure air one-way valve; 35. Low-pressure air relief valve; 36. Exhalation air path; 37. Exhaust port; 38. Electronic PEE valve; 39. Exhalation module; 40. First air resistance; 41. Exhalation end pressure sensor; 42. Exhalation pressure difference sensor; 43. Water blowing branch; 44. Two-position three-way valve; 45. Solenoid switch valve; 46. Second air resistance; 47. Third air resistance; 48. Atomization air path; 49. Atomization port; 50. Atomization air resistance; 51. Atomization valve. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] like Figure 1 As shown, an embodiment of the utility model provides a ventilator, including an inhalation air circuit 1 and an expiratory air circuit 36, the inhalation air circuit 1 includes an oxygen branch 2, a high-pressure air branch 13 and an inhalation end branch 24, the oxygen branch 2 and the high-pressure air branch 13 are both connected to the inhalation end branch 24, the inhalation end branch 24 is used to deliver air-oxygen mixed gas to the patient, and the expiratory air circuit 36 ​​is used to discharge the gas generated by the patient's breathing to the outside.

[0022] The oxygen branch 2 includes an oxygen source 3, an oxygen proportional valve 9, an oxygen flow stabilizing structure, an oxygen flow sensor 11 and a first oxygen one-way valve 12 connected in sequence. The oxygen proportional valve 9 is used to adjust the size of the oxygen flow entering the oxygen branch 2, and the oxygen flow stabilizing structure is used to reduce the flow rate of the gas coming out of the oxygen proportional valve 9, and to transport the reduced-speed gas to the oxygen flow sensor 11.

[0023] In one embodiment, the oxygen flow stabilization structure includes a first oxygen filter 10, which is connected between the oxygen proportional valve 9 and the oxygen flow sensor 11, and is used to filter and reduce the speed of oxygen. The filter is a common medical device, which is easy to design and reduces costs.

[0024] In one embodiment, the oxygen branch 2 further includes an oxygen pressure sensor 4, an oxygen pressure relief valve 5, an oxygen pressure reducing valve 8 and a second oxygen one-way valve 7. The oxygen pressure sensor 4 and the oxygen pressure relief valve 5 are connected between the oxygen source 3 and the oxygen proportional valve 9. The oxygen pressure sensor 4 is used to detect the oxygen pressure in the oxygen branch 2. The oxygen pressure relief valve 5 is used to quickly reduce the oxygen pressure in the oxygen branch 2. The second oxygen one-way valve 7 is connected between the oxygen pressure relief valve 5 and the oxygen proportional valve 9. The oxygen pressure reducing valve 8 is connected between the second oxygen one-way valve 7 and the oxygen proportional valve 9. The oxygen pressure reducing valve 8 is used to reduce the oxygen in the oxygen branch 2 to a preset pressure.

[0025] Specifically, a second oxygen filter 6 is further provided between the second oxygen one-way valve 7 and the oxygen pressure sensor 4. When the patient needs oxygen, the oxygen source 3 is connected to the oxygen branch 2, and the oxygen pressure sensor 4 measures a specific oxygen pressure value. If the measured oxygen pressure is greater than the pressure value set by the oxygen pressure relief valve 5, the oxygen pressure relief valve 5 is opened to discharge the oxygen with excess pressure to the outside, so as to ensure that the pressure entering the oxygen branch 2 does not exceed 0.68Mpa. After that, the second oxygen filter 6 filters the oxygen to prevent the impurities in the oxygen source 3 from entering the patient's body. After that, the oxygen passes through the second oxygen one-way valve 7 and enters the oxygen pressure reducing valve 8. The oxygen pressure reducing valve 8 reduces the high-pressure oxygen to 0.23-0.28Mpa. The oxygen after pressure reduction enters the oxygen proportional valve 9. The oxygen proportional valve 9 adjusts the oxygen flow rate according to the specific situation of the patient. After that, the oxygen enters the first oxygen filter 10. The first oxygen filter 10 decelerates the rapid oxygen and filters it again. The slow-flowing gas after deceleration enters the inhalation end branch 24 through the oxygen flow sensor 11 and the first oxygen one-way valve 12.

[0026] In one embodiment, the high-pressure air branch 13 includes a high-pressure air source 14, a high-pressure air proportional valve 20, an air flow stabilization structure, an air flow sensor 22 and a first high-pressure air one-way valve 23 connected in sequence. The high-pressure air proportional valve 20 is used to adjust the flow rate of the high-pressure air entering the high-pressure air branch 13, and the air flow stabilization structure is used to reduce the flow rate of the gas coming out of the high-pressure air proportional valve 20, and to deliver the reduced-speed gas to the air flow sensor 22.

[0027] In one embodiment, the air flow stabilization structure includes a first high-pressure air filter 21, which is connected between the high-pressure air proportional valve 20 and the air flow sensor 22, and can filter and reduce the speed of air. The filter is a common medical device, which is easy to design and reduces costs.

[0028] In one embodiment, the high-pressure air branch 13 also includes an air pressure sensor 15, a high-pressure air pressure relief valve 16, a high-pressure air reducing valve 19 and a second high-pressure air one-way valve 18. The air pressure sensor 15 and the high-pressure air pressure relief valve 16 are connected between the high-pressure air source 14 and the high-pressure air proportional valve 20. The air pressure sensor 15 is used to detect the air pressure in the high-pressure air branch 13. The high-pressure air pressure relief valve 16 is used to quickly reduce the air pressure in the high-pressure air branch 13. The second high-pressure air one-way valve 18 is connected between the high-pressure air pressure relief valve 16 and the high-pressure air proportional valve 20. The high-pressure air reducing valve 19 is connected between the second high-pressure air one-way valve 18 and the high-pressure air proportional valve 20. The high-pressure air reducing valve 19 is used to reduce the air in the high-pressure air branch 13 to a preset pressure.

[0029] Specifically, a second high-pressure air filter 17 is further provided between the second high-pressure air one-way valve 18 and the air pressure sensor 15. When the patient needs high-pressure air, the high-pressure air source 14 is connected to the high-pressure air branch 13, and the air pressure sensor 15 measures the specific pressure value of the high-pressure air. If the measured high-pressure air pressure is greater than the pressure value set by the high-pressure air relief valve 16, the high-pressure air relief valve 16 opens to discharge the high-pressure air of the excess pressure to the outside, ensuring that the pressure entering the high-pressure air branch 13 does not exceed 0.68Mpa. After that, the second high-pressure air filter 17 filters the high-pressure air to avoid the high-pressure air source 14 The impurities in the air enter the patient's body, and then the high-pressure air passes through the second high-pressure air one-way valve 18 and enters the high-pressure air reducing valve 19. The high-pressure air reducing valve 19 reduces the high-pressure air to 0.23-0.28Mpa. The high-pressure air after decompression enters the high-pressure air proportional valve 20. The high-pressure air proportional valve 20 adjusts the size of the high-pressure air flow according to the specific situation of the patient. Then the high-pressure air enters the first high-pressure air filter 21. The first high-pressure air filter 21 slows down the rapid high-pressure air and filters it again. The slow-flowing gas after deceleration enters the intake end branch 24 through the air flow sensor 22 and the first high-pressure air one-way valve 23.

[0030] In one embodiment, the inhalation end branch 24 includes an air-oxygen mixer 25, an air-oxygen mixed gas flow sensor 26, an oxygen concentration sensor 27, an inhalation end pressure sensor and an inhalation port 30 which are connected in sequence. The first oxygen one-way valve 12 is connected to the air-oxygen mixer 25, the first high-pressure air one-way valve 23 is connected to the air-oxygen mixer 25, the inhalation port 30 is used to be connected to the patient, the inhalation end pressure sensor is used to detect the patient's inhalation pressure, the oxygen concentration sensor 27 is used to detect the oxygen concentration in the inhalation end branch 24, and the air-oxygen mixed gas flow sensor 26 is used to detect the flow of the air-oxygen mixed gas in the inhalation end branch 24.

[0031] In one embodiment, the intake end branch 24 also includes an electronic safety valve 29, which is connected between the air-oxygen mixed gas flow sensor 26 and the oxygen concentration sensor 27, and is used to open when the gas pressure in the intake end branch 24 exceeds a limit value to reduce the gas pressure in the intake end branch 24.

[0032] Specifically, the first oxygen one-way valve 12 and the first high-pressure air one-way valve 23 are connected to the air-oxygen mixer 25, and the high-pressure air and oxygen are mixed in the air-oxygen mixer 25. The mixed gas enters the patient's body through the air-oxygen mixed gas flow sensor 26, the oxygen concentration sensor 27 and the inhalation end pressure sensor. When the gas pressure in the inhalation end branch 24 exceeds the preset pressure value, the electronic safety valve 29 opens to reduce the gas pressure in the inhalation end branch 24 to avoid a greater impact on the patient.

[0033] In one embodiment, the inhalation air circuit 1 further includes a low-pressure air branch 31, which includes a low-pressure air source 32, a low-pressure air filter 33, a low-pressure air check valve 34 and a low-pressure air pressure relief valve 35 connected in sequence, and the low-pressure air pressure relief valve 35 is connected between the air-oxygen mixed gas flow sensor 26 and the oxygen concentration sensor 27. When a problem occurs in the high-pressure air branch 13 or the oxygen branch 2, the low-pressure air passes through the low-pressure air filter 33, the low-pressure air check valve 34 and the low-pressure air pressure relief valve 35 and enters the inhalation end branch 24 to provide air and oxygen to the patient.

[0034] In one embodiment, the exhalation air circuit 36 ​​includes an exhaust port 37, an exhalation module 39, a first air resistance 40 and an exhalation port which are connected in sequence, the exhalation port is used to be connected to the patient, the exhalation module 39 includes an electronic PEEP valve, the electronic PEEP valve is used to adjust the gas pressure value in the exhalation air circuit 36, and the exhaust port 37 is connected to the outside world, and is used to discharge the gas in the exhalation air circuit 36 ​​to the outside world.

[0035] In one embodiment, the exhalation air circuit 36 ​​further includes a water blowing branch 43, the water blowing branch 43 includes a two-position three-way valve 44, an electromagnetic switch valve 45 and a second air resistor 46 connected in sequence, the two-position three-way valve 44 is connected to the oxygen branch 2 and the high-pressure air branch 13, the second air resistor 46 is connected between the exhalation module 39 and the first air resistor 40, the electromagnetic switch valve 45 is used to control the on-off of the water blowing branch 43, and the water blowing branch 43 is used to blow air into the exhalation module 39. When condensed water is generated in the exhalation module 39, the electromagnetic switch valve 45 is opened to introduce high-pressure air or oxygen into the exhalation air circuit 36 ​​to blow air into the exhalation module 39 to blow out the condensed water in the exhalation module 39.

[0036] In one embodiment, the exhalation branch further includes a third air resistor 47, an exhalation pressure difference sensor 42 and an exhalation end pressure sensor 41, and the third air resistor 47, the exhalation pressure difference sensor 42 and the exhalation end pressure sensor 41 are connected between the electromagnetic switch valve 45 and the inhalation port 30. When the exhalation end pressure sensor 41 measures that the patient's exhalation pressure is too low, the electronic PEEP valve adjusts the resistance in the exhalation module 39 to help the patient breathe.

[0037] In one embodiment, the ventilator also includes an atomization gas circuit 48, and the atomization gas circuit 48 includes an atomization port 49, an atomization gas resistance 50 and an atomization valve 51 connected in sequence. The atomization valve 51 is connected to the two-position three-way valve 44 and is used to introduce oxygen or high-pressure air into the atomization gas circuit 48 to atomize the drug with the help of oxygen or high-pressure air.

[0038] The working principle of the ventilator of the present utility model embodiment is as follows:

[0039] The oxygen source 3 is connected to the oxygen branch 2, and the oxygen pressure sensor 4 measures the specific oxygen pressure value. If the measured oxygen pressure is greater than the pressure value set by the oxygen pressure relief valve 5, the oxygen pressure relief valve 5 is opened to discharge the excess pressure oxygen to the outside to ensure that the pressure entering the oxygen branch 2 does not exceed 0.68Mpa. After that, the second oxygen filter 6 filters the oxygen to prevent debris in the oxygen source 3 from entering the patient's body. After that, the oxygen passes through the second oxygen check valve 7 and enters the oxygen pressure reducing valve 8. The oxygen pressure reducing valve 8 reduces the high-pressure oxygen to 0.23-0.28Mpa. The oxygen after pressure reduction enters the oxygen proportional valve 9. The oxygen proportional valve 9 adjusts the oxygen flow rate according to the specific situation of the patient. After that, the oxygen enters the first oxygen filter 10. The first oxygen filter 10 slows down the rapid oxygen and filters it again. The slow-flowing gas after speed reduction enters the inhalation end branch 24 through the oxygen flow sensor 11 and the first oxygen check valve 12.

[0040] When the patient needs high-pressure air, the high-pressure air source 14 is connected to the high-pressure air branch 13, and the air pressure sensor 15 measures the specific pressure value of the high-pressure air. If the measured high-pressure air pressure is greater than the pressure value set by the high-pressure air pressure relief valve 16, the high-pressure air pressure relief valve 16 opens to discharge the high-pressure air with excess pressure to the outside to ensure that the pressure entering the high-pressure air branch 13 does not exceed 0.68Mpa. After that, the second high-pressure air filter 17 filters the high-pressure air to prevent debris in the high-pressure air source 14 from entering the patient's body. After that, the high-pressure air passes through the second high-pressure air filter 17. The air enters the high-pressure air reducing valve 19 after the one-way valve 18. The high-pressure air reducing valve 19 reduces the high-pressure air to 0.23-0.28Mpa. The high-pressure air after decompression enters the high-pressure air proportional valve 20. The high-pressure air proportional valve 20 adjusts the size of the high-pressure air flow according to the specific situation of the patient. Then the high-pressure air enters the first high-pressure air filter 21. The first high-pressure air filter 21 reduces the speed of the rapid high-pressure air and filters it again. The slow-flow gas after deceleration enters the intake end branch 24 through the air flow sensor 22 and the first high-pressure air one-way valve 23.

[0041] The first oxygen one-way valve 12 and the first high-pressure air one-way valve 23 are connected to the air-oxygen mixer 25. The high-pressure air and oxygen are mixed in the air-oxygen mixer 25. The mixed gas enters the patient's body through the air-oxygen mixed gas flow sensor 26, the oxygen concentration sensor 27 and the inhalation end pressure sensor. When the gas pressure in the inhalation end branch 24 exceeds the preset pressure value, the electronic safety valve 29 opens to reduce the gas pressure in the inhalation end branch 24 to avoid a greater impact on the patient.

[0042] When a problem occurs in the high-pressure air branch 13 or the oxygen branch 2, low-pressure air passes through the low-pressure air filter 33, the low-pressure air one-way valve 34 and the low-pressure air pressure relief valve 35 into the inhalation end branch 24 to provide air and oxygen to the patient.

[0043] According to the ventilator of the embodiment of the utility model, the oxygen flow stabilizing structure can reduce the flow rate of oxygen coming out of the oxygen proportional valve 9, and can reduce the rapid flow of oxygen to a slow flow gas, so that the flow rate of oxygen entering the oxygen flow sensor 11 is relatively slow, reducing the impact on the measurement accuracy of the oxygen flow sensor 11, and improving the accuracy of the oxygen flow measured by the oxygen flow sensor 11.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ventilator, characterized in that: The invention comprises an inhalation air circuit (1) and an exhalation air circuit (36), wherein the inhalation air circuit (1) comprises an oxygen branch circuit (2), a high-pressure air branch circuit (13) and an inhalation end branch circuit (24), wherein the oxygen branch circuit (2) and the high-pressure air branch circuit (13) are both connected to the inhalation end branch circuit (24), the inhalation end branch circuit (24) is used to deliver air-oxygen mixed gas to a patient, and the exhalation air circuit (36) is used to discharge gas generated by the patient's breathing to the outside; The oxygen branch (2) comprises an oxygen source (3), an oxygen proportional valve (9), an oxygen flow stabilizing structure, an oxygen flow sensor (11) and a first oxygen one-way valve (12) which are connected in sequence. The oxygen proportional valve (9) is used to adjust the oxygen flow rate entering the oxygen branch (2). The oxygen flow stabilizing structure is used to reduce the flow rate of the gas coming out of the oxygen proportional valve (9) and to deliver the reduced-speed gas to the oxygen flow sensor (11).

2. The ventilator according to claim 1, characterized in that: The oxygen flow stabilization structure comprises a first oxygen filter (10), wherein the first oxygen filter (10) is connected between the oxygen proportional valve (9) and the oxygen flow sensor (11) and is used for filtering and reducing the speed of oxygen.

3. The ventilator according to claim 2, characterized in that: The oxygen branch (2) further comprises an oxygen pressure sensor (4), an oxygen pressure relief valve (5), an oxygen pressure reducing valve (8) and a second oxygen one-way valve (7). The oxygen pressure sensor (4) and the oxygen pressure relief valve (5) are connected between the oxygen source (3) and the oxygen proportional valve (9). The oxygen pressure sensor (4) is used to detect the oxygen pressure in the oxygen branch (2). The oxygen pressure relief valve (5) is used to quickly reduce the oxygen pressure in the oxygen branch (2). The second oxygen one-way valve (7) is connected between the oxygen pressure relief valve (5) and the oxygen proportional valve (9). The oxygen pressure reducing valve (8) is connected between the second oxygen one-way valve (7) and the oxygen proportional valve (9). The oxygen pressure reducing valve (8) is used to reduce the oxygen in the oxygen branch (2) to a preset pressure.

4. The ventilator according to claim 3, characterized in that: The high-pressure air branch (13) comprises a high-pressure air source (14), a high-pressure air proportional valve (20), an air flow stabilization structure, an air flow sensor (22) and a first high-pressure air one-way valve (23) which are connected in sequence. The high-pressure air proportional valve (20) is used to adjust the flow rate of the high-pressure air entering the high-pressure air branch (13). The air flow stabilization structure is used to reduce the flow rate of the gas coming out of the high-pressure air proportional valve (20) and to transport the reduced-speed gas to the air flow sensor (22).

5. The ventilator according to claim 4, characterized in that: The air flow stabilization structure comprises a first high-pressure air filter (21), wherein the first high-pressure air filter (21) is connected between the high-pressure air proportional valve (20) and the air flow sensor (22), and is capable of filtering and reducing the speed of air.

6. The ventilator according to claim 5, characterized in that: The high-pressure air branch (13) further comprises an air pressure sensor (15), a high-pressure air pressure relief valve (16), a high-pressure air pressure reducing valve (19) and a second high-pressure air one-way valve (18); the air pressure sensor (15) and the high-pressure air pressure relief valve (16) are connected between the high-pressure air source (14) and the high-pressure air proportional valve (20); the air pressure sensor (15) is used to detect the air pressure in the high-pressure air branch (13); the high-pressure air pressure relief valve (16) is used to quickly reduce the air pressure in the high-pressure air branch (13); the second high-pressure air one-way valve (18) is connected between the high-pressure air pressure relief valve (16) and the high-pressure air proportional valve (20); the high-pressure air pressure reducing valve (19) is connected between the second high-pressure air one-way valve (18) and the high-pressure air proportional valve (20); the high-pressure air pressure reducing valve (19) is used to reduce the air in the high-pressure air branch (13) to a preset pressure.

7. The ventilator according to claim 6, characterized in that: The inhalation end branch (24) comprises an air-oxygen mixer (25), an air-oxygen mixed gas flow sensor (26), an oxygen concentration sensor (27), an inhalation end pressure sensor and an inhalation port (30) which are connected in sequence; the first oxygen one-way valve (12) is connected to the air-oxygen mixer (25); the first high-pressure air one-way valve (23) is connected to the air-oxygen mixer (25); the inhalation port (30) is used to be connected to a patient; the inhalation end pressure sensor is used to detect the inhalation pressure of the patient; the oxygen concentration sensor (27) is used to detect the oxygen concentration in the inhalation end branch (24); and the air-oxygen mixed gas flow sensor (26) is used to detect the flow of the air-oxygen mixed gas in the inhalation end branch (24).

8. The ventilator according to claim 7, characterized in that: The inlet end branch (24) further comprises an electronic safety valve (29), which is connected between the air-oxygen mixed gas flow sensor (26) and the oxygen concentration sensor (27) and is used to open when the gas pressure in the inlet end branch (24) exceeds a limit value, so as to reduce the gas pressure in the inlet end branch (24).

9. The ventilator according to claim 8, characterized in that The exhalation air circuit (36) comprises an exhaust port (37), an exhalation module (39), a first air resistance (40) and an exhalation port which are connected in sequence, wherein the exhalation port is used to be connected to a patient, and the exhalation module (39) comprises an electronic PEEP valve, wherein the electronic PEEP valve is used to adjust the gas pressure value in the exhalation air circuit (36), and the exhaust port (37) is connected to the outside world and is used to discharge the gas in the exhalation air circuit (36) to the outside world.

10. The ventilator according to claim 9, characterized in that: The exhalation air circuit (36) further comprises a water blowing branch circuit (43), wherein the water blowing branch circuit (43) comprises a two-position three-way valve (44), an electromagnetic switch valve (45) and a second air resistor (46) which are connected in sequence, wherein the two-position three-way valve (44) is connected to the oxygen branch circuit (2) and the high-pressure air branch circuit (13), and the second air resistor (46) is connected between the exhalation module (39) and the first air resistor (40). The electromagnetic switch valve (45) is used to control the on / off of the water blowing branch circuit (43), and the water blowing branch circuit (43) is used to blow air into the exhalation module (39).

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