Air and oxygen mixing device and breathing machine

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to an air and oxygen mixing device and a breathing machine. In the air-oxygen mixing device, an oxygen channel, an air channel, an air outlet channel, a balance cavity and a mixing cavity are arranged on a seat body; the diaphragm is mounted in the balance cavity and is used for dividing the balance cavity into a first space and a second space; the oxygen channel communicates with the first space through an oxygen regulating valve, and the air channel communicates with the second space through an air regulating valve; the first adjusting rod and the second adjusting rod are installed on the two opposite side faces of the membrane respectively, the first adjusting rod is used for adjusting the opening size of the oxygen adjusting valve, and the second adjusting rod is used for adjusting the opening size of the air adjusting valve. The concentration adjusting valve is installed in the mixing cavity, and the first space and the second space communicate with the air outlet channel through the concentration adjusting valve. The whole air-oxygen mixing device is mechanical valves, electric control is not needed, and the safety of the air-oxygen mixing device is improved; and the air-oxygen mixing device is simple in structure and high in adjusting precision.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to an air-oxygen mixing device and a ventilator. Background Art

[0002] A ventilator is an indispensable medical device in the treatment of anesthesia respiratory management, respiratory failure, and critical rescue, etc. As a medical device, a ventilator can replace, control, or change a person's normal physiological respiration, enhance pulmonary ventilation volume, improve respiratory function, reduce the consumption of respiratory work, and save the heart reserve capacity.

[0003] A ventilator usually uses a flow proportion valve to control the flow rates of oxygen and air, so as to control the oxygen concentration output by the ventilator. However, the flow proportion valve is an electric control valve, and there are accidents with low safety. Summary of the Utility Model

[0004] Aiming at the technical problem of low safety existing in the flow proportion valve in the prior art, the utility model provides an air-oxygen mixing device and a ventilator.

[0005] In view of the above technical problems, the first embodiment of the utility model provides an air-oxygen mixing device, which includes a seat body, a concentration regulating valve, an oxygen regulating valve, an air regulating valve, a diaphragm, a first adjusting rod, and a second adjusting rod.

[0006] An oxygen passage, an air passage, an air outlet passage, a balance chamber, and a mixing chamber are provided on the seat body. The diaphragm is installed in the balance chamber and is used to divide the balance chamber into a first space and a second space. The oxygen passage communicates with the first space through the oxygen regulating valve, and the air passage communicates with the second space through the air regulating valve.

[0007] The first adjusting rod and the second adjusting rod are respectively installed on opposite side surfaces of the diaphragm, and the first adjusting rod is used to adjust the opening size of the oxygen regulating valve, and the second adjusting rod is used to adjust the opening size of the air regulating valve.

[0008] The concentration regulating valve is installed in the mixing chamber, and both the first space and the second space communicate with the air outlet passage through the concentration regulating valve.

[0009] Optionally, a first mounting hole and a first tapered hole communicating with the oxygen passage are further provided on the seat body, and the first mounting hole communicates with the first space through the first tapered hole.

[0010] The oxygen regulating valve includes a first elastic member and a first sphere installed in the first tapered hole. The first elastic member is installed in the first mounting hole and abuts against the first end of the first sphere, and the end of the first adjusting rod away from the diaphragm abuts against the second end of the first sphere.

[0011] Optionally, the seat body is further provided with a second mounting hole and a second tapered hole communicating with the air passage. The second mounting hole communicates with the second space through the second tapered hole;

[0012] The air regulating valve includes a second elastic member and a second sphere installed in the second tapered hole. The second elastic member is installed in the second mounting hole and abuts against the first end of the second sphere, and the end of the second adjusting rod away from the diaphragm abuts against the second end of the second sphere.

[0013] Optionally, the concentration regulating valve includes a valve stem and a first valve cylinder provided with a first internal through hole and installed in the mixing chamber;

[0014] The valve stem is movably installed in the first internal through hole. The first internal through hole includes a first inner hole, a second inner hole, and a third inner hole that are sequentially arranged and communicated. The valve stem is provided with a first adjusting portion and a second adjusting portion both located in the second inner hole. The first adjusting portion is used to adjust the opening size of the first inner hole communicating with the second inner hole, and the second adjusting portion is used to adjust the opening size of the third inner hole communicating with the second inner hole;

[0015] The side wall of the first valve cylinder is provided with a first inlet, a second inlet, and a first outlet. The first space communicates with the first inner hole through the first inlet, the second space communicates with the third inner hole through the second inlet, and the second inner hole communicates with the air outlet passage through the first outlet.

[0016] Optionally, the concentration regulating valve further includes a third elastic member installed in the first inner hole and abutting against the valve stem;

[0017] The valve stem is provided with a first external thread, and the inner wall of the third inner hole is provided with a first internal thread. The valve stem is installed in the first internal through hole by screwing the first internal thread and the first external thread.

[0018] Optionally, the seat body is further provided with a third mounting hole. The air-oxygen mixing device further includes a balance valve installed in the third mounting hole and a whistle installed on the seat body;

[0019] The side wall of the balance valve is provided with a first air hole, a second air hole and a second outlet. The oxygen channel is also communicated with the first air hole, the air channel is also communicated with the second air hole, and the balance valve is communicated with the inlet of the whistler through the second outlet;

[0020] The balance valve is used to control the first air hole or the second air hole to communicate with the inlet of the whistler when the absolute value of the difference between the oxygen pressure in the oxygen channel and the air pressure in the air channel is greater than or equal to a preset pressure.

[0021] Optionally, the balance valve includes a slide rod, a fourth elastic member, a fifth elastic member, and a second valve cylinder having a second internal through hole and installed in the third mounting hole;

[0022] The slide rod is slidably installed in the second internal through hole and is used to divide the internal through hole into a fourth inner hole and a fifth inner hole;

[0023] The first air hole, the second air hole and the second outlet are all arranged on the side wall of the second valve cylinder. The oxygen channel is communicated with the fourth inner hole through the first air hole, and the air channel is communicated with the fifth inner hole through the second air hole;

[0024] The fourth elastic member is installed in the fourth inner hole and abuts against the slide rod, and the fifth elastic member is installed in the fifth inner hole and abuts against the slide rod;

[0025] The slide rod slides in the inner hole to control the on-off between the fourth inner hole and the second outlet, and to control the on-off between the fifth inner hole and the second outlet.

[0026] Optionally, the whistler includes a piston, a sixth elastic member, a whistling member, and an outer cylinder having an internal space. The opposite ends of the outer cylinder are respectively provided with an air inlet hole and an air outlet hole communicating with the internal space; the outer cylinder is installed on the seat body, and the second outlet is communicated with the internal space through the air inlet hole;

[0027] The piston, the sixth elastic member and the whistling member are all installed in the internal space. The piston is used to control the on-off between the air inlet hole and the internal space, and the opposite ends of the sixth elastic member respectively abut against the piston and the whistling member.

[0028] Optionally, the concentration regulating valve and the oxygen regulating valve are symmetrically arranged on opposite sides of the diaphragm.

[0029] Another embodiment of the present invention also provides a ventilator, including the above-mentioned air-oxygen mixing device.

[0030] In the present utility model, when the concentration regulating valve increases the opening degree of the input to the first space, the opening degree of the input to the synchronous second space decreases, the oxygen pressure in the first space decreases, and the oxygen pressure in the second space increases. At this time, the diaphragm drives the second adjusting rod to increase the opening degree of the air regulating valve, the air flow rate in the second space increases, and the diaphragm drives the first adjusting rod to decrease the opening degree of the oxygen regulating valve, and the oxygen flow rate in the first space decreases, so as to reduce the air-oxygen mixing ratio of the output gas in the air outlet passage. When the concentration regulating valve decreases the opening degree of the input to the first space, the opening degree of the input to the synchronous second space increases, the oxygen pressure in the first space increases, and the oxygen pressure in the second space decreases. At this time, the diaphragm drives the first adjusting rod to increase the opening degree of the oxygen regulating valve, the oxygen flow rate in the first space increases, and the diaphragm drives the second adjusting rod to decrease the opening degree of the air regulating valve, and the air flow rate in the second space decreases, so as to increase the air-oxygen mixing ratio of the output gas in the air outlet passage. In the present utility model, all the air-oxygen mixing devices are mechanical valves, without electric control, which improves its safety; and the structure of the air-oxygen mixing device is simple and the adjustment accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present utility model will be further described below with reference to the drawings and embodiments.

[0032] Figure 1 is a schematic structural diagram of an air-oxygen mixing device provided by an embodiment of the present utility model;

[0033] Figure 2 is a schematic structural diagram of an air-oxygen mixing device provided by an embodiment of the present utility model;

[0034] Figure 3 is a partial cross-sectional view of an air-oxygen mixing device provided by an embodiment of the present utility model;

[0035] Figure 4 is a cross-sectional view of an air-oxygen mixing device provided by an embodiment of the present utility model at the concentration regulating valve;

[0036] Figure 5 is a cross-sectional view of an air-oxygen mixing device provided by an embodiment of the present utility model at the balance valve;

[0037] Figure 6 is a cross-sectional view of a whistle of an air-oxygen mixing device provided by an embodiment of the present utility model.

[0038] The reference numerals in the specification are as follows:

[0039] 1. Seat body; 11. Oxygen passage; 12. Air passage; 13. Exhaust passage; 14. Balance chamber; 141. First space; 142. Second space; 15. Mixing chamber; 16. First mounting hole; 17. First tapered hole; 18. Second mounting hole; 19. Second tapered hole; 2. Concentration regulating valve; 21. Valve stem; 211. First adjusting portion; 212. Second adjusting portion; 22. First valve barrel; 221. First internal through hole; 2211. First inner hole; 2212. Second inner hole; 2213. Third inner hole; 222. First inlet; 223. Second inlet; 224. First outlet; 23. Third elastic member; 3. Oxygen regulating valve; 31. First elastic member; 32. First sphere; 4. Air regulating valve; 41. Second elastic member; 42. Second sphere; 5. Diaphragm; 6. First adjusting rod; 7. Second adjusting rod; 8. Balance valve; 81. Slide rod; 82. Fourth elastic member; 83. Fifth elastic member; 84. Second valve barrel; 841. Second internal through hole; 8411. Fourth inner hole; 8412. Fifth inner hole; 842. First air hole; 843. Second air hole; 844. Second outlet; 9. Whistler; 91. Piston; 92. Sixth elastic member; 93. Whistling member; 94. Outer cylinder; 941. Internal space; 942. Air inlet hole; 943. Air outlet hole. Detailed implementation manners

[0040] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0041] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.

[0042] As Figures 1 to 3 shown, an air-oxygen mixing device provided by an embodiment of the present utility model includes a seat body 1, a concentration regulating valve 2, an oxygen regulating valve 3, an air regulating valve 4, a diaphragm 5, a first adjusting rod 6 and a second adjusting rod 7;

[0043] An oxygen passage 11, an air passage 12, an air outlet passage 13, a balance chamber 14 and a mixing chamber 15 are provided on the base body 1; a diaphragm 5 is installed in the balance chamber 14 and is used to divide the balance chamber 14 into a first space 141 and a second space 142; the oxygen passage 11 communicates with the first space 141 through an oxygen regulating valve 3, and the air passage 12 communicates with the second space 142 through an air regulating valve 4; preferably, the first space 141 and the second space 142 are symmetrically arranged with the diaphragm 5 as the symmetry plane.

[0044] A first adjusting rod 6 and a second adjusting rod 7 are respectively installed on opposite side surfaces of the diaphragm 5, and the first adjusting rod 6 is used to adjust the opening size of the oxygen regulating valve 3, and the second adjusting rod 7 is used to adjust the opening size of the air regulating valve 4; it can be understood that the movement of the diaphragm 5 drives the first adjusting rod 6, so that the first adjusting rod 6 can adjust the opening degree of the oxygen regulating valve 3; similarly, the movement of the diaphragm 5 drives the second adjusting rod 7, so that the second adjusting rod 7 can adjust the opening degree of the air regulating valve 4.

[0045] A concentration regulating valve 2 is installed in the mixing chamber 15, and both the first space 141 and the second space 142 communicate with the air outlet passage 13 through the concentration regulating valve 2. It can be understood that the oxygen in the first space 141 and the air in the second space 142 are both input into the concentration regulating valve 2 for mixing, and then the air-oxygen mixture is output through the air outlet passage 13; and the concentration regulating valve 2 can adjust the amount of oxygen input into it from the first space 141, and can adjust the amount of air input into it from the second space 142.

[0046] Specifically, when the opening degree of the concentration regulating valve 2 for the input from the first space 141 increases, synchronously the opening degree of the input from the second space 142 decreases, and the oxygen pressure in the first space 141 decreases, and the oxygen pressure in the second space 142 increases. At this time, the diaphragm 5 drives the second adjusting rod 7 to increase the opening degree of the air regulating valve 4, the air flow rate in the second space 142 increases, and the diaphragm 5 drives the first adjusting rod 6 to decrease the opening degree of the oxygen regulating valve 3, and the oxygen flow rate in the first space 141 decreases, so as to reduce the air-oxygen mixing ratio of the gas output from the air outlet passage 13. When the opening degree of the concentration regulating valve 2 for the input from the first space 141 decreases, synchronously the opening degree of the input from the second space 142 increases, and the oxygen pressure in the first space 141 increases, and the oxygen pressure in the second space 142 decreases. At this time, the diaphragm 5 drives the first adjusting rod 6 to increase the opening degree of the oxygen regulating valve 3, the oxygen flow rate in the first space 141 increases, and the diaphragm 5 drives the second adjusting rod 7 to decrease the opening degree of the air regulating valve 4, and the air flow rate in the second space 142 decreases, so as to increase the air-oxygen mixing ratio of the gas output from the air outlet passage 13. In the present utility model, all the air-oxygen mixing devices are mechanical valves, without electric control, improving its safety; and the structure of the air-oxygen mixing device is simple and the adjustment accuracy is high.

[0047] In one embodiment, as Figure 2 and Figure 3 shown, the seat body 1 is further provided with a first mounting hole 16 and a first tapered hole 17 communicating with the oxygen passage 11. The first mounting hole 16 communicates with the first space 141 through the first tapered hole 17. It can be understood that the opening of the first tapered hole 17 at the end facing the first space 141 is smaller than the opening at the end facing the first mounting hole 16. The oxygen passage 11 communicates with the first space 141 through the first mounting hole 16 and the first tapered hole 17 in sequence.

[0048] The oxygen regulating valve 3 includes a first elastic member 31 and a first sphere 32 installed in the first tapered hole 17. The first elastic member 31 is installed in the first mounting hole 16 and abuts against the first end of the first sphere 32. The end of the first adjusting rod 6 away from the diaphragm 5 abuts against the second end of the first sphere 32. It can be understood that the first elastic member 31 includes, but is not limited to, a spring, etc. The first elastic member 31 and the first adjusting rod 6 respectively abut against the left and right sides of the first sphere 32.

[0049] Specifically, when the diaphragm 5 drives the first adjusting rod 6 to move towards the first mounting hole 16, the first adjusting rod 6 drives the first sphere 32 to compress the first elastic member 31. The first sphere 32 increases the opening degree of the first tapered hole 17, thereby increasing the amount of oxygen flowing from the oxygen passage 11 into the first space 141. When the diaphragm 5 drives the first adjusting rod 6 to move away from the first mounting hole 16, the first adjusting rod 6 moves away from the first sphere 32. The compressed first elastic member 31 will drive the first sphere 32 to move towards the first space 141. The first sphere 32 reduces the opening degree of the first tapered hole 17, thereby reducing the amount of oxygen flowing from the oxygen passage 11 into the first space 141.

[0050] In one embodiment, as Figure 2 and Figure 3 shown, the seat body 1 is further provided with a second mounting hole 18 and a second tapered hole 19 communicating with the air passage 12. The second mounting hole 18 communicates with the second space 142 through the second tapered hole 19. It can be understood that the opening of the second tapered hole 19 at the end facing the second space 142 is smaller than the opening at the end facing the second mounting hole 18. The air passage 12 communicates with the second space 142 through the second mounting hole 18 and the second tapered hole 19 in sequence.

[0051] The air regulating valve 4 includes a second elastic member 41 and a second sphere 42 installed in the second tapered hole 19. The second elastic member 41 is installed in the second mounting hole 18 and abuts against the first end of the second sphere 42. The end of the second adjusting rod 7 away from the diaphragm 5 abuts against the second end of the second sphere 42. It can be understood that the second elastic member 41 includes, but is not limited to, a spring, etc. The second elastic member 41 and the second adjusting rod 7 respectively abut against the left and right sides of the second sphere 42.

[0052] Specifically, when the diaphragm 5 drives the second adjusting rod 7 to move towards the second mounting hole 18, the second adjusting rod 7 drives the second sphere 42 to compress the second elastic member 41. The second sphere 42 increases the opening degree of the second tapered hole 19, thereby increasing the amount of air flowing from the air passage 12 into the second space 142. When the diaphragm 5 drives the second adjusting rod 7 to move away from the second mounting hole 18, the second adjusting rod 7 moves away from the second sphere 42. The compressed second elastic member 41 drives the second sphere 42 to move towards the second space 142. The second sphere 42 decreases the opening degree of the second tapered hole 19, thereby decreasing the amount of air flowing from the air passage 12 into the second space 142.

[0053] In one embodiment, as Figure 2 and Figure 4 shown, the concentration regulating valve 2 includes a valve stem 21 and a first valve barrel 22 provided with a first internal through hole 221 and installed in the mixing chamber 15;

[0054] The valve stem 21 is movably installed in the first internal through hole 221. The first internal through hole 221 includes a first inner hole 2211, a second inner hole 2212, and a third inner hole 2213 that are sequentially arranged and communicated. The valve stem 21 is provided with a first adjusting portion 211 and a second adjusting portion 212 both located in the second inner hole 2212. The first adjusting portion 211 is used to adjust the opening size of the communication between the first inner hole 2211 and the second inner hole 2212, and the second adjusting portion 212 is used to adjust the opening size of the communication between the third inner hole 2213 and the second inner hole 2212. It can be understood that the first adjusting portion 211 is a first tapered member, and the communication between the first inner hole 2211 and the second inner hole 2212 is a first tapered hole. The opening size of the communication between the first inner hole 2211 and the second inner hole 2212 is adjusted by the depth of insertion of the first tapered member into the first tapered hole. The second adjusting portion 212 is a second tapered member, and the communication between the third inner hole 2213 and the second inner hole 2212 is a second tapered hole. The opening size of the communication between the third inner hole 2213 and the second inner hole 2212 is adjusted by the depth of insertion of the second tapered member into the second tapered hole.

[0055] On the side wall of the first valve barrel 22, there are a first inlet 222, a second inlet 223, and a first outlet 224; the first space 141 communicates with the first inner hole 2211 through the first inlet 222, the second space 142 communicates with the third inner hole 2213 through the second inlet 223, and the second inner hole 2212 communicates with the air outlet passage 13 through the first outlet 224. It can be understood that the first outlet 224 is located between the first inlet 222 and the second inlet 223; the oxygen in the first space 141 is input into the first inner hole 2211 through the first inlet 222, the air in the second space 142 is input into the third inner hole 2213 through the second inlet 223, and after the oxygen in the first inner hole 2211 and the air in the third inner hole 2213 are mixed in the second inner hole 2212, they are then input into the air outlet passage 13 through the first outlet 224.

[0056] Specifically, when the valve stem 21 moves towards the direction of the first inner hole 2211, the valve stem 21 reduces the opening degree at the connection between the first inner hole 2211 and the second inner hole 2212, and at the same time increases the opening degree at the connection between the third inner hole 2213 and the second inner hole 2212, thereby increasing the pressure of the oxygen in the first inner hole 2211 (that is, increasing the pressure of the oxygen in the first space 141) and reducing the pressure of the air in the third inner hole 2213 (that is, reducing the pressure of the air in the second space 142). In this embodiment, the concentration regulating valve 2 has a simple structure and low manufacturing cost.

[0057] In one embodiment, as Figure 4 shown, the concentration regulating valve 2 further includes a third elastic member 23 installed in the first inner hole 2211 and abutted against the valve stem 21; it can be understood that the third elastic member 23 includes but is not limited to a spring, etc.

[0058] The valve stem 21 is provided with a first external thread (not shown in the figure), the inner wall of the third inner hole 2213 is provided with a first internal thread (not shown in the figure), and the valve stem 21 is installed in the first internal through hole 221 through the first internal thread and the first external thread connected by threads. It can be understood that by rotating the valve stem 21, the valve stem 21 can move in the first internal through hole 221, thereby changing the opening degree of the connection between the first inner hole 2211 and the second inner hole 2212, and changing the opening degree of the connection between the third inner hole 2213 and the second inner hole 2212; the third elastic member 23 is compressed by the valve stem 21, so that the third elastic member 23 can drive the valve stem 21 to reset. In this embodiment, the adjustment operation of the concentration regulating valve 2 is simple.

[0059] In one embodiment, as Figure 1 and Figure 2 shown, the seat body 1 is further provided with a third mounting hole, and the air-oxygen mixing device further includes a balance valve 8 installed in the third mounting hole and a whistler 9 installed on the seat body 1;

[0060] On the side wall of the balance valve 8, there are a first air hole 842, a second air hole 843, and a second outlet 844. The oxygen passage 11 is also connected to the first air hole 842, the air passage 12 is also connected to the second air hole 843, and the balance valve 8 is connected to the inlet of the whistler 9 through the second outlet 844;

[0061] The balance valve 8 is used to control the connection between the first air hole 842 or the second air hole 843 and the inlet of the whistler 9 when the absolute value of the difference between the oxygen pressure in the oxygen passage 11 and the air pressure in the air passage 12 is greater than or equal to a preset pressure. It can be understood that the preset pressure can be designed according to actual needs.

[0062] Specifically, when the oxygen pressure in the oxygen passage 11 is greater than the air pressure in the air passage 12, and the difference between the oxygen pressure and the air pressure is greater than or equal to the preset pressure, the oxygen in the oxygen passage 11 is sequentially input into the whistler 9 through the first air hole 842 and the second outlet 844, and the whistler 9 will issue a high-pressure alarm. When the air pressure in the air passage 12 is greater than the oxygen pressure in the oxygen passage 11, and the difference between the air pressure and the oxygen pressure is greater than or equal to the preset pressure, the air in the air passage 12 is sequentially input into the whistler 9 through the second air hole 843 and the second outlet 844, and the whistler 9 will issue a high-pressure alarm. When the absolute value of the difference between the oxygen pressure in the oxygen passage 11 and the air pressure in the air passage 12 is less than the preset pressure, neither the first air hole 842 nor the second air hole 843 is connected to the second outlet 844, and the whistler 9 will not issue a high-pressure alarm. In this embodiment, the design of the balance valve 8 and the whistler 9 further improves the safety and integration of the air-oxygen mixing device.

[0063] In one embodiment, as Figure 2 and Figure 5 shown, the balance valve 8 includes a sliding rod 81, a fourth elastic member 82, a fifth elastic member 83, and a second valve cylinder 84 provided with a second internal through hole 841 and installed in the third mounting hole; it can be understood that both the fourth elastic member 82 and the fifth elastic member 83 include but are not limited to springs, etc.

[0064] The sliding rod 81 is slidably installed in the second internal through hole 841 and is used to divide the second internal through hole 841 into a fourth inner hole 8411 and a fifth inner hole 8412;

[0065] The first air hole 842, the second air hole 843, and the second outlet 844 are all provided on the side wall of the second valve cylinder 84. The oxygen passage 11 is connected to the fourth inner hole 8411 through the first air hole 842, and the air passage 12 is connected to the fifth inner hole 8412 through the second air hole 843;

[0066] The fourth elastic member 82 is installed in the fourth inner hole 8411 and abuts against the sliding rod 81, and the fifth elastic member 83 is installed in the fifth inner hole 8412 and abuts against the sliding rod 81. Understandably, the fourth elastic member 82 and the fifth elastic member 83 respectively abut against the opposite ends of the sliding rod 81. It should be noted that the preset pressure is related to the pre-tightening force of the fourth elastic member 82 and the fifth elastic member 83 on the sliding rod 81.

[0067] The sliding rod 81 slides in the inner hole to control the on-off between the fourth inner hole 8411 and the second outlet 844, and to control the on-off between the fifth inner hole 8412 and the second outlet 844.

[0068] Specifically, when the oxygen pressure in the oxygen passage 11 is greater than the air pressure in the air passage 12, and the difference between the oxygen pressure and the air pressure is greater than or equal to the preset pressure, the sliding rod 81 moves towards the fifth inner hole 8412 until the fourth inner hole 8411 communicates with the second outlet 844. At this time, the oxygen in the oxygen passage 11 sequentially passes through the first air hole 842, the fourth inner hole 8411 and the second outlet 844 and is input into the whistler 9, and the whistler 9 will issue a high-pressure alarm. When the air pressure in the air passage 12 is greater than the oxygen pressure in the oxygen passage 11, and the difference between the air pressure and the oxygen pressure is greater than or equal to the preset pressure, the sliding rod 81 moves towards the fourth inner hole 8411 until the fifth inner hole 8412 communicates with the second outlet 844; the air in the air passage 12 sequentially passes through the second air hole 843, the fifth inner hole 8412 and the second outlet 844 and is input into the whistler 9, and the whistler 9 will issue a high-pressure alarm. When the absolute value of the difference between the oxygen pressure in the oxygen passage 11 and the air pressure in the air passage 12 is less than the preset pressure, the fourth elastic member 82 and the fifth elastic member 83 will drive the sliding rod 81 to reset in the second internal through hole 841, the sliding rod 81 will block the second outlet 844, and both the first air hole 842 and the second air hole 843 do not communicate with the second outlet 844, and the whistler 9 will not issue a high-pressure alarm. In this embodiment, the structure of the whistler 9 is simple and the manufacturing cost is low.

[0069] In one embodiment, as Figure 2 and Figure 6 shown, the whistler 9 includes a piston 91, a sixth elastic member 92, a whistling member 93 and an outer cylinder 94 provided with an internal space 941. The opposite ends of the outer cylinder 94 are respectively provided with an air inlet hole 942 and an air outlet hole 943 communicating with the internal space 941; the outer cylinder 94 is installed on the seat body 1, and the second outlet 844 communicates with the internal space 941 through the air inlet hole 942; Understandably, the sixth elastic member 92 includes but is not limited to springs, elastic sheets, etc., and the rebounding force of the sixth elastic member will reset the piston 91 at the position blocking the air inlet hole 942.

[0070] The piston 91, the sixth elastic member 92, and the whistling member 93 are all installed in the internal space 941. The piston 91 is used to control the opening and closing of the air inlet hole 942 and the internal space 941. The opposite ends of the sixth elastic member 92 are respectively abutted against the piston 91 and the whistling member 93.

[0071] Specifically, the gas output from the second outlet 844 of the balance valve 8 is input into the internal space 941 through the air inlet hole 942. The gas will drive the piston 91 to drive the air inlet hole 942. The gas in the air inlet hole 942 enters the internal space 941 and blows onto the whistling member 93, and the whistling member 93 will issue a high-pressure alarm. In this embodiment, the structure of the whistler 9 is simple and the manufacturing cost is low.

[0072] In one embodiment, as Figure 2 shown, the concentration regulating valve 2 and the oxygen regulating valve 3 are symmetrically arranged on opposite sides of the diaphragm 5.

[0073] Another embodiment of the present invention further provides a ventilator, including the above-mentioned air-oxygen mixing device.

[0074] The above are only the embodiments of the air-oxygen mixing device of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air-oxygen mixing device, characterized in that: It includes a seat body, a concentration regulating valve, an oxygen regulating valve, an air regulating valve, a diaphragm, a first regulating rod and a second regulating rod; The seat body is provided with an oxygen passage, an air passage, an air outlet, a balancing chamber and a mixing chamber; the diaphragm is installed in the balancing chamber and is used to separate the balancing chamber into a first space and a second space; the oxygen passage is connected to the first space through the oxygen regulating valve, and the air passage is connected to the second space through the air regulating valve; The first adjusting rod and the second adjusting rod are respectively installed on two opposite sides of the diaphragm, and the first adjusting rod is used to adjust the opening size of the oxygen regulating valve, and the second adjusting rod is used to adjust the opening size of the air regulating valve; The concentration regulating valve is installed in the mixing chamber, and the first space and the second space are both connected to the air outlet through the concentration regulating valve.

2. The air-oxygen mixing device according to claim 1, characterized in that: The seat body is also provided with a first mounting hole and a first tapered hole communicating with the oxygen passage, and the first mounting hole is communicated with the first space through the first tapered hole; The oxygen regulating valve comprises a first elastic member and a first sphere installed in the first conical hole, the first elastic member is installed in the first installation hole and abuts against a first end of the first sphere, and an end of the first regulating rod away from the diaphragm abuts against a second end of the first sphere.

3. The air-oxygen mixing device according to claim 1, characterized in that: The seat body is further provided with a second mounting hole and a second tapered hole communicating with the air passage, and the second mounting hole is communicated with the second space through the second tapered hole; The air regulating valve comprises a second elastic member and a second sphere installed in the second conical hole, the second elastic member is installed in the second mounting hole and abuts against the first end of the second sphere, and the end of the second regulating rod away from the diaphragm abuts against the second end of the second sphere.

4. The air-oxygen mixing device according to claim 1, characterized in that: The concentration regulating valve comprises a valve stem and a first valve cylinder provided with a first internal through hole and installed in the mixing chamber; The valve stem is movably mounted in the first internal through hole, and the first internal through hole includes a first inner hole, a second inner hole and a third inner hole which are arranged in sequence and connected; the valve stem is provided with a first adjusting portion and a second adjusting portion which are both located in the second inner hole, the first adjusting portion is used to adjust the opening size of the first inner hole connecting to the second inner hole, and the second adjusting portion is used to adjust the opening size of the third inner hole connecting to the second inner hole; A first inlet, a second inlet and a first outlet are provided on the side wall of the first valve cylinder; the first space is connected to the first inner hole through the first inlet, the second space is connected to the third inner hole through the second inlet, and the second inner hole is connected to the air outlet through the first outlet.

5. The air-oxygen mixing device according to claim 4, characterized in that: The concentration regulating valve further comprises a third elastic member installed in the first inner hole and abutting against the valve stem; The valve stem is provided with a first external thread, the inner wall of the third inner hole is provided with a first internal thread, and the valve stem is installed in the first internal through hole through the first internal thread and the first external thread which are threadedly connected.

6. The air-oxygen mixing device according to claim 1, characterized in that: The seat body is also provided with a third mounting hole, and the air-oxygen mixing device further comprises a balancing valve mounted in the third mounting hole and a howler mounted on the seat body; The side wall of the balancing valve is provided with a first air hole, a second air hole and a second outlet, the oxygen passage is also connected to the first air hole, the air passage is also connected to the second air hole, and the balancing valve is connected to the inlet of the whistle device through the second outlet; The balancing valve is used to control the first air hole or the second air hole to connect to the inlet of the whistle device when the absolute value of the difference between the oxygen pressure in the oxygen passage and the air pressure in the air passage is greater than or equal to a preset pressure.

7. The air-oxygen mixing device according to claim 6, characterized in that: The balancing valve comprises a sliding rod, a fourth elastic member, a fifth elastic member, and a second valve cylinder having a second internal through hole and installed in the third installation hole; The sliding rod is slidably installed in the second internal through hole and is used to separate the second internal through hole into a fourth inner hole and a fifth inner hole; The first air hole, the second air hole and the second outlet are all arranged on the side wall of the second valve cylinder, the oxygen passage is connected to the fourth inner hole through the first air hole, and the air passage is connected to the fifth inner hole through the second air hole; The fourth elastic member is installed in the fourth inner hole and abuts against the sliding rod, and the fifth elastic member is installed in the fifth inner hole and abuts against the sliding rod; The sliding rod slides in the inner hole to control the connection and disconnection between the fourth inner hole and the second outlet, and to control the connection and disconnection between the fifth inner hole and the second outlet.

8. The air-oxygen mixing device according to claim 6, characterized in that: The whistling device comprises a piston, a sixth elastic member, a whistling member and an outer tube with an internal space, wherein opposite ends of the outer tube are respectively provided with an air inlet and an air outlet connected to the internal space; the outer tube is mounted on the seat, and the second outlet is connected to the internal space through the air inlet; The piston, the sixth elastic member and the whistling member are all installed in the internal space. The piston is used to control the connection and disconnection between the air inlet hole and the internal space. The opposite ends of the sixth elastic member are respectively in contact with the piston and the whistling member.

9. The air-oxygen mixing device according to any one of claims 1 to 8, characterized in that: The concentration regulating valve and the oxygen regulating valve are symmetrically arranged on opposite sides of the diaphragm.

10. A ventilator, characterized in that: It comprises the air-oxygen mixing device as claimed in any one of claims 1 to 9.

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