CN215875875U

CN215875875U - Air-oxygen mixer

Info

Publication number: CN215875875U
Application number: CN202121755918.9U
Authority: CN
Inventors: 高超; 王瑞强; 高贵锋; 高科峰
Original assignee: Ambulanc Shenzhen Tech Co Ltd
Current assignee: Ambulanc Shenzhen Tech Co Ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-02-22
Anticipated expiration: 2031-07-29

Abstract

The utility model discloses an air-oxygen mixer, which comprises: the air mixing device comprises a base, wherein a gas mixing cavity is formed in the base, and the base is provided with an air inlet channel, an oxygen inlet channel and an air outlet channel which are communicated with the gas mixing cavity, so that air and oxygen enter the gas mixing cavity through the air inlet channel and the oxygen inlet channel respectively and are discharged through the air outlet channel; the adjusting rod is at least partially arranged in the air inlet channel and the oxygen inlet channel; and the driving motor is connected with the adjusting rod and can drive the adjusting rod to move, so that the adjusting rod is increased with the clearance of the air inlet channel and the clearance of the oxygen inlet channel is reduced, or the air inlet channel is reduced and the clearance of the oxygen inlet channel is increased. The air-oxygen mixer of the technical scheme of the utility model can accurately adjust and control the oxygen concentration after mixing.

Description

Air-oxygen mixer

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an air-oxygen mixer.

Background

Some of the existing air-oxygen mixers utilize a venturi device to attract low-pressure air by utilizing high-pressure oxygen so as to achieve the purpose of air-oxygen mixing; some adopt the mechanical structure, after inputting high-pressure oxygen and high-pressure air, utilize balanced valve and flow control valve to realize the air-oxygen is mixed; and the oxygen concentration is controlled by adopting micro-electronic control and respectively controlling the flow ratio of oxygen and air by an electronic proportional valve or an electromagnetic valve. In the related art, a mechanical structure is adopted to realize air-oxygen mixing, and generally, the oxygen concentration is controlled by using a manual adjusting knob or a balance valve, but the structure often cannot accurately control and adjust the balance valve, so that the oxygen concentration after final mixing is easy to deviate.

SUMMERY OF THE UTILITY MODEL

The main object of the present invention is to provide an air-oxygen mixer, aiming at precisely adjusting and controlling the oxygen concentration after mixing.

In order to achieve the above object, the present invention provides an air-oxygen mixer, comprising:

the air mixing device comprises a base, wherein a gas mixing cavity is formed in the base, and the base is provided with an air inlet channel, an oxygen inlet channel and an air outlet channel which are communicated with the gas mixing cavity, so that air and oxygen enter the gas mixing cavity through the air inlet channel and the oxygen inlet channel respectively and are discharged through the air outlet channel;

the adjusting rod is at least partially arranged in the air inlet channel and the oxygen inlet channel; and

driving motor, driving motor with adjust the pole and connect, and can drive adjust the pole motion, so that adjust the pole with the clearance increase of air intake duct, with the clearance of oxygen intake duct reduces, perhaps with the clearance of air intake duct reduces, with the clearance increase of oxygen intake duct.

Optionally, adjust the pole including the first linkage segment, first toper section, second toper section and the second linkage segment that connect gradually, first linkage segment is kept away from the one end of first toper section with driving motor connects, the diameter of first toper section is keeping away from increase gradually in the direction of first linkage segment, the diameter of second toper section is being close to reduce gradually in the direction of second linkage segment, first toper section with second toper section stretches into in the gas mixing chamber, and can reciprocating motion in the gas mixing chamber, in order to adjust first toper section with clearance between the oxygen intake duct second toper section with clearance between the air intake duct.

Optionally, the adjusting rod comprises a first rod body and a second rod body, the first rod body is formed with the first connecting section and the first conical section, the second rod body is formed with the second conical section and the second connecting section, the first rod body is adjacent to the end face of one end of the first conical section is an arc-shaped face, the second rod body is adjacent to the end face of one end of the second conical section is a plane, and the arc-shaped face is connected to the plane.

Optionally, one end of the second rod body, which is far away from the first rod body, is provided with an elastic part, the elastic part is connected with the base, the arc-shaped surface abuts against the plane, and the first rod body pushes the second rod body to move, so that the elastic part deforms.

Optionally, still be formed with gaseous balance chamber in the frame, gaseous balance intracavity is equipped with mobilizable balanced valve clack, balanced valve clack will gaseous balance chamber is separated and is formed with first cavity and second cavity, the gas mixing chamber passes through first cavity with air intake duct intercommunication, pass through the second cavity with oxygen intake duct intercommunication.

Optionally, a first elastic seat and a second elastic seat are respectively installed in the first cavity and the second cavity, a first abutting ball and a second abutting ball are respectively connected to two sides of the balance valve flap, the first abutting ball is elastically abutted to the first elastic seat, and the second abutting ball is abutted to the second elastic seat.

Optionally, the number of the gas balance cavities is two, and one of the gas balance cavities is defined as a first balance cavity, and the other gas balance cavity is defined as a second balance cavity, the balance valve flaps are respectively arranged in the first balance cavity and the second balance cavity, the first cavity of the first balance cavity is communicated with the first cavity of the second balance cavity, and the second cavity of the first balance cavity is communicated with the second cavity of the second balance cavity.

Optionally, still be equipped with the warning chamber in the frame, the warning chamber is equipped with the slidable sliding body, the sliding body will the space separation in warning chamber forms into third cavity and fourth cavity, the third cavity with air intake duct intercommunication, the fourth cavity with oxygen intake duct intercommunication, the bottom in warning chamber is equipped with the air vent, the exit of air vent is equipped with the warning whistle, the sliding body correspond the shutoff in the import department of air vent.

Optionally, the number of the gas outlet channels is multiple, and a flow meter is installed at an outlet of each gas outlet channel.

Optionally, a humidification cup is further installed at the outlet of the air outlet channel.

When the air-oxygen mixer provided by the technical scheme of the utility model is used, air and oxygen respectively enter the gas mixing cavity through the air inlet channel and the oxygen inlet channel to be mixed, and the mixed gas is discharged through the air outlet channel. The adjusting rod penetrates through the air inlet channel and the oxygen inlet channel and is connected with the adjusting rod through the driving motor, so that the driving motor can be used for driving the adjusting rod to move, the gap between the adjusting rod and the air inlet channel and the gap between the adjusting rod and the oxygen inlet channel can be changed in the moving process, and when the gap between the adjusting rod and the air inlet channel is increased, the gap between the adjusting rod and the oxygen inlet channel is reduced; and when the clearance with the air intake passage is reduced, the clearance with the oxygen intake passage is increased. Like this through the motion of driving motor control regulation pole, alright in order to reach the purpose of control air and oxygen air input, realize the regulation to mist oxygen concentration, driving motor can the accurate control adjust the movement stroke of pole moreover, compares in the structure of manual knob or balanced valve of adjusting of manual work, has improved the precision of adjusting and controlling oxygen concentration greatly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an air-oxygen mixer according to an embodiment of the present invention;

FIG. 2 is another perspective view of FIG. 1;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

fig. 5 is a schematic structural diagram of the air-oxygen mixer of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The present invention provides an air-oxygen mixer 100.

Referring to fig. 1 to 5, in an embodiment of the present invention, the air-oxygen mixer 100 includes:

the engine base 10 is provided with an air mixing cavity 101 formed in the engine base 10, and the engine base 10 is provided with an air inlet channel 11, an oxygen inlet channel 12 and an air outlet channel 13 which are communicated with the air mixing cavity 101, so that air and oxygen respectively enter the air mixing cavity 101 through the air inlet channel 11 and the oxygen inlet channel 12, and the air outlet channel 13 is discharged;

the adjusting rod 20 is at least partially arranged in the air inlet channel 11 and the oxygen inlet channel 12; and

driving motor 30, driving motor 30 with adjust pole 20 and connect, and can drive adjust the pole 20 motion, so that adjust pole 20 with the clearance increase of air intake duct 11, with the clearance of oxygen intake duct 12 reduces, perhaps with the clearance of air intake duct 11 reduces, with the clearance increase of oxygen intake duct 12.

In this embodiment, the air inlet 11 and the oxygen inlet 12 are respectively air and oxygen inlet passages, and extend in the housing 10. The adjusting rod 20 is partially positioned in the machine base 10, the other part of the adjusting rod extends out of the machine base 10 and is connected with the driving motor 30, and the part of the adjusting rod 20 positioned in the machine base 10 extends into the air inlet 11 and the oxygen inlet 12. It should be noted that the gap between the adjusting rod 20 and the air inlet 11 is the gap between the outer wall of the adjusting rod 20 and the inner wall of the air passage of the air inlet 11, and similarly, the gap between the adjusting rod 20 and the oxygen inlet 12 is the gap between the outer wall of the adjusting rod 20 and the inner wall of the air passage of the oxygen inlet 12. When the gap is increased, the amount of intake air or oxygen can be increased, and when the gap is decreased, the amount of intake air or oxygen is also decreased.

In one embodiment, the drive motor 30 is a stepper motor, which is a motor that converts electrical pulse signals into corresponding angular or linear displacements. The rotor rotates an angle or one step before inputting a pulse signal, the output angular displacement or linear displacement is proportional to the input pulse number, and the rotating speed is proportional to the pulse frequency. Compared with other motors, the stepping motor has better control precision, can further accurately control the axial feeding and the reciprocating motion of the adjusting rod 20, and has good reliability and longer service life because the stepping motor has no electric brush.

When the air-oxygen mixer 100 provided by the technical scheme of the utility model is used, air and oxygen respectively enter the gas mixing cavity 101 through the air inlet channel 11 and the oxygen inlet channel 12 to be mixed, and the mixed gas is discharged through the gas outlet channel 13. The adjusting rod 20 penetrates through the air inlet channel 11 and the oxygen inlet channel 12 and is connected with the adjusting rod 20 through the driving motor 30, so that the driving motor 30 can be used for driving the adjusting rod 20 to move, the gap between the adjusting rod 20 and the air inlet channel 11 and the gap between the adjusting rod 20 and the oxygen inlet channel 12 can be changed in the moving process, and when the gap between the adjusting rod 20 and the air inlet channel 11 is increased, the gap between the adjusting rod 20 and the oxygen inlet channel 12 is reduced; and when the clearance with the air intake duct 11 is reduced, the clearance with the oxygen intake duct 12 is increased. Like this through the motion of driving motor 30 control regulation pole 20, alright in order to reach the purpose of control air and oxygen air input, realize the regulation to mist oxygen concentration, driving motor 30 can the accurate control adjust the movement stroke of pole 20 moreover, compares in the structure of manual knob or balanced valve of adjusting, has improved the precision of adjusting and controlling oxygen concentration greatly.

Referring to fig. 4 in combination, in order to realize the gap control between the adjusting rod 20 and the air inlet 11 and the oxygen inlet 12, in an embodiment of the present application, the adjustment lever 20 includes a first connection section 211, a first tapered section 212, a second tapered section 221 and a second connection section 222 which are connected in sequence, the end of the first connecting section 211 remote from the first conical section 212 is connected to the driving motor 30, the diameter of the first tapered section 212 gradually increases in a direction away from the first connection section 211, the diameter of the second tapered section 221 is gradually reduced in a direction approaching the second connection section 222, the first tapered section 212 and the second tapered section 221 extend into the gas mixing chamber 101, and are reciprocally movable within the gas mixing chamber 101, so as to adjust the clearance between the first tapered section 212 and the oxygen inlet duct 12 and the clearance between the second tapered section 221 and the air inlet duct 11.

In this embodiment, the adjusting rod 20 is formed with two conical surfaces with opposite taper directions, when the conical surface of the first conical section 212 abuts against the communication opening between the oxygen inlet channel 12 and the gas mixing chamber 101, the oxygen inlet channel 12 can be blocked, and the adjusting rod 20 is driven by the driving motor 30, during the feeding movement, the gap between the conical surface of the first conical section 212 and the communication opening between the oxygen inlet channel 12 and the gas mixing chamber 101 gradually increases, and at this time, the amount of oxygen entering the gas mixing chamber 101 gradually increases; at the same time, the gap between the tapered surface of the second tapered section 221 and the communicating opening between the air inlet channel 11 and the gas mixing chamber 101 gradually decreases, and the amount of air entering the gas mixing chamber 101 gradually decreases, thereby increasing the oxygen concentration of the mixed gas discharged from the gas outlet channel 13. Similarly, when the adjusting lever 20 is controlled to move in the reverse direction, the oxygen concentration of the mixed gas discharged from the gas outlet channel 13 can be increased. So, adjust the air input that pole 20 was controlled to the position through driving motor 30 accurate control, the effectual accurate regulation and control of oxygen concentration of having guaranteed, moreover, need not manual regulation, the cost is also lower.

Of course, in another embodiment, the adjusting rod 20 may be provided with arc-shaped rod segments with gradually changing diameters, so that the adjusting rod 20 can adjust the air intake amount by changing the gap between the arc-shaped rod segments and the two communication ports when moving. Alternatively, a baffle structure may be provided on the adjusting rod 20, so that during the movement of the adjusting rod 20, the baffle structure may gradually open and gradually close the two communication ports, respectively, thereby adjusting the intake air amount through the gap change with the air intake duct 11 and the oxygen intake duct 12.

Further, the adjusting rod 20 includes a first rod body 21 and a second rod body 22, the first rod body 21 is formed with the first connecting section 211 and the first tapered section 212, the second rod body 22 is formed with the second tapered section 221 and the second connecting section 222, an end surface of one end of the first rod body 21 adjacent to the first tapered section 212 is an arc surface, an end surface of one end of the second rod body 22 adjacent to the second tapered section 221 is a plane, and the arc surface is connected to the plane.

In this embodiment, can insert gas mixing chamber 101 with first body of rod 21 and second body of rod 22 respectively via air intake duct 11 and oxygen intake duct 12 in, will adjust pole 20 like this and set up to the sectional type structure, can be convenient will adjust pole 20 and install when air intake duct 11 and oxygen intake duct 12, also can conveniently stretch into and carry out the air flue shutoff in gas mixing chamber 101, installation easy operation, efficiency are higher. In addition, the end faces, connected with the second rod body 22 and the first rod body 21, of the two rod bodies are respectively arranged to be arc-shaped faces and planes, so that the two rod bodies can be conveniently connected in a butt joint process, the axis can be automatically adjusted and aligned in the butt joint process, and the coaxiality of the assembled adjusting rod 20 is guaranteed.

Further, in an embodiment of the present application, an elastic member 40 is disposed at an end of the second rod 22 away from the first rod 21, the elastic member 40 is connected to the base 10, the arc-shaped surface abuts against the plane, and the first rod 21 pushes the second rod 22 to move, so that the elastic member 40 deforms. The elastic member 40 may be a spring abutting against the inner wall of the base 10, and the end surface of the second rod 22 is formed with a recess into which the spring is inserted to abut against the base 10. Through setting up elastic component 40 for when first body of rod 21 promoted the motion of the second body of rod 22, the second body of rod 22 can provide certain elasticity resistance, thereby can reverse promotion second body of rod 22 and the motion of the first body of rod 21, need not manual regulation, improves the control accuracy to the position of adjusting lever 20.

In practical applications, when air and oxygen are introduced through the air inlet duct 11 and the oxygen inlet duct 12, the air pressure of the air and the oxygen is not necessarily completely balanced, so that the air pressure of the mixture can be ensured to be balanced. Referring to fig. 3 and 5 in combination, in an embodiment of the present application, an air balance cavity 102 is further formed in the engine base 10, a movable balance valve flap 50 is arranged in the air balance cavity 102, the balance valve flap 50 will the air balance cavity 102 is separated to form a first cavity and a second cavity, the air mixing cavity 101 passes through the first cavity and the air inlet 11 communicate, pass through the second cavity and the oxygen inlet 12 communicate.

In this embodiment, the first and second chambers formed in the gas balance chamber 102 are respectively filled with air and oxygen, and when the air pressure of the first chamber is greater than the air pressure of the second chamber, the balance flap 50 moves toward the second chamber, so that the pressure of the gas entering the second chamber can be increased, and the balance flap 50 moves toward the first chamber to maintain the air pressure balance again. Similarly, when the air pressure in the first chamber is smaller than the air pressure in the second chamber, the balance flap 50 moves toward the first chamber, so that the air pressure entering the first chamber can be increased to ensure that the air pressure entering the air mixing chamber 101 can be kept balanced.

In order to realize the movable adjustment of the balance valve flap 50, in an embodiment of the present application, a first elastic seat 51 and a second elastic seat 52 are respectively installed on the first cavity and the second cavity, a first abutting ball 53 and a second abutting ball 54 are respectively connected to two sides of the balance valve flap 50, the first abutting ball 53 elastically abuts against the first elastic seat 51, and the second abutting ball 54 abuts against the second elastic seat 52.

Specifically, each of the first elastic seat 51 and the second elastic seat 52 includes a seat body and a spring, the seat body is fixed to the machine base 10, one end of the spring is connected to the seat body, the other end of the spring is abutted to the first abutting ball 53, and the second elastic seat 52 has the same structure as the first elastic seat 51. Therefore, in the state of air pressure balance, the balance valve flap 50 elastically abuts against the first elastic seat 51 and the second elastic seat 52 through the first abutting ball 53 and the second abutting ball 54 respectively to maintain balance, when the air pressure on one side is increased, the balance valve flap 50 can move towards the other side, so that the spring is compressed, and after the air pressure on the other side is increased, the balance valve flap 50 can rebound until the air pressures on the two sides are balanced.

In one embodiment, the number of the gas balance cavities 102 is two, and one of the gas balance cavities 102 is defined as a first balance cavity, and the other gas balance cavity 102 is defined as a second balance cavity, the balance flaps 50 are respectively disposed in the first balance cavity and the second balance cavity, the first cavity of the first balance cavity is communicated with the first cavity of the second balance cavity, and the second cavity of the first balance cavity is communicated with the second cavity of the second balance cavity.

In this embodiment, a first balance chamber is provided for communication with the air inlet duct 11 and the oxygen inlet duct 12, and a second balance chamber is provided for communication with the gas mixing chamber 101. After entering, the air and the oxygen can sequentially pass through the first balance cavity and the second balance cavity and then enter the gas mixing cavity 101 to be mixed, so that the air entering the gas mixing cavity 101 can be gradually balanced through the two gas balance cavities 102, and the constant pressure difference between the air and the oxygen finally entering the gas mixing cavity 101 is ensured.

Referring to fig. 5, in an embodiment, an alarm cavity 103 is further disposed in the base 10, the alarm cavity 103 is provided with a slidable sliding body 60, the sliding body 60 separates a space of the alarm cavity 103 into a third cavity and a fourth cavity, the third cavity is communicated with the air inlet 11, the fourth cavity is communicated with the oxygen inlet 12, a vent 1031 is disposed at the bottom of the alarm cavity 103, an alarm whistle 70 is disposed at an outlet of the vent 1031, and the sliding body 60 is correspondingly plugged at an inlet of the vent 1031.

The sliding structure of the sliding body 60 is similar to the movable structure of the balance valve flap 50, under normal conditions, the sliding body 60 is located in the middle of the alarm cavity 103 and blocks the inlet of the vent 1031, and when the air pressure of air entering the third cavity or oxygen entering the fourth cavity is greater than the air pressure in the cavity on the other side, the sliding body 60 slides in the alarm cavity 103, so that the air entering the vent 1031 is opened, the air pressure can enter the channel, the alarm whistle 70 gives an alarm, and the alarm prompt function when the air pressure difference is too large is realized.

Referring to fig. 1 and 2, in an embodiment of the present application, the number of the outlet channels 13 is multiple, and a flow meter 80 is installed at an outlet of each of the outlet channels 13. The number of the gas outlet channels 13 can be 2, 3, 4 or more, the specifications of the flow meters 80 installed at the outlets of the gas outlet channels 13 can be the same or different, and when the flow meters 80 with different specifications are installed (such as 20L, 25L and the like), different flow control of the gas outlet channels 13 can be realized, and different use requirements can be met.

Further, a humidifying cup (not shown) is installed at the outlet of the air outlet channel 13 in the present application. The arrangement of the humidifying cup can increase the humidity of the air flowing out of the air outlet channel 13, so that the patient feels more comfortable in the process of breathing.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An air-oxygen mixer, comprising:

2. The air-oxygen mixer of claim 1, wherein the adjusting rod comprises a first connecting section, a first tapered section, a second tapered section and a second connecting section which are connected in sequence, wherein the first connecting section is far away from one end of the first tapered section and is connected with the driving motor, the diameter of the first tapered section is gradually increased in the direction of being far away from the first connecting section, the diameter of the second tapered section is gradually reduced in the direction of being close to the second connecting section, and the first tapered section and the second tapered section extend into the gas mixing cavity and can reciprocate in the gas mixing cavity to adjust the gap between the first tapered section and the oxygen inlet channel and the gap between the second tapered section and the air inlet channel.

3. The air-oxygen mixer according to claim 2, wherein the adjusting lever comprises a first lever body and a second lever body, the first lever body is formed with the first connection section and the first taper section, the second lever body is formed with the second taper section and the second connection section, an end surface of the first lever body adjacent to an end of the first taper section is an arc-shaped surface, an end surface of the second lever body adjacent to an end of the second taper section is a plane surface, and the arc-shaped surface is connected to the plane surface.

4. An air-oxygen mixer according to claim 3, wherein an end of the second rod remote from the first rod is provided with an elastic member, the elastic member is connected to the base, the arc-shaped surface abuts against the plane, and the first rod pushes the second rod to move, so that the elastic member deforms.

5. The air-oxygen mixer according to any one of claims 1 to 4, wherein a gas balance chamber is further formed in the base, a movable balance valve flap is disposed in the gas balance chamber, the balance valve flap separates the gas balance chamber into a first chamber and a second chamber, and the gas mixing chamber is communicated with the air inlet via the first chamber and the oxygen inlet via the second chamber.

6. The air-oxygen mixer according to claim 5, wherein a first elastic seat and a second elastic seat are respectively installed in the first cavity and the second cavity, a first abutting ball and a second abutting ball are respectively connected to two sides of the balance valve flap, the first abutting ball is elastically abutted against the first elastic seat, and the second abutting ball is abutted against the second elastic seat.

7. The air-oxygen mixer of claim 5, wherein the number of the gas balance chambers is two, and one of the gas balance chambers is defined as a first balance chamber, and the other gas balance chamber is defined as a second balance chamber, the balance valve flaps are respectively arranged in the first balance chamber and the second balance chamber, the first chamber body of the first balance chamber is communicated with the first chamber body of the second balance chamber, and the second chamber body of the first balance chamber is communicated with the second chamber body of the second balance chamber.

8. The air-oxygen mixer according to claim 5, wherein an alarm chamber is further provided in the base, the alarm chamber is provided with a slidable sliding body, the sliding body divides the alarm chamber into a third chamber and a fourth chamber, the third chamber is communicated with the air inlet, the fourth chamber is communicated with the oxygen inlet, an air duct is provided at the bottom of the alarm chamber, an alarm whistle is provided at the outlet of the air duct, and the sliding body is correspondingly blocked at the inlet of the air duct.

9. The air-oxygen mixer according to any one of claims 1 to 5, wherein the number of the gas outlet passages is plural, and a flow meter is installed at an outlet of each of the gas outlet passages.

10. An air-oxygen mixer according to any of claims 1 to 5, wherein a humidification cup is further installed at the outlet of the air outlet channel.