A breathing machine

Abstract

The application relates to a breathing machine, comprising: an oxygen gas circuit for providing oxygen; an air gas circuit for providing air; an air-oxygen mixing cavity, the air inlet ends of the air-oxygen mixing cavity being connected with the oxygen gas circuit and the air gas circuit respectively; and a piezoelectric valve, which is arranged on the gas circuit between the air outlet end of the air-oxygen mixing cavity and a patient interface, and is used for controlling the frequency and air flow of the air flow delivered to the patient interface. The piezoelectric valve is used to replace a traditional high-frequency generator to realize the generation of oscillating air flow, avoid the wear and failure of mechanical parts, and improve the performance of the breathing machine; the piezoelectric valve does not generate heat, and the temperature rise problem does not exist, so that the stability and service life of the breathing machine are greatly improved.

Description

Technical Field

[0001] This application relates to the field of respiratory equipment technology, and more specifically, to a ventilator. Background Technology

[0002] A ventilator is a medical device used to assist patients' breathing and is widely used in hospitals, emergency centers, and other places. Its core component is a high-frequency generator, which provides respiratory support by generating a high-frequency oscillating airflow. However, existing high-frequency generators typically generate oscillating airflow by reciprocating the motion of a mechanical shaft, which drives a diaphragm within a sealed cavity to move bidirectionally. This mechanical structure is prone to mechanical failure under prolonged high-intensity operation, leading to performance degradation. Furthermore, the heat dissipation problem of mechanical high-frequency generators is significant; prolonged operation may cause the device to overheat, affecting its stability and lifespan. Utility Model Content

[0003] The purpose of this application is to provide a ventilator that uses a piezoelectric valve instead of a traditional high-frequency generator to generate oscillating airflow, thereby avoiding wear and failure of mechanical parts and improving the performance of the ventilator; moreover, it does not generate heat itself and there is no temperature rise problem, thus greatly improving the stability and service life of the ventilator.

[0004] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0005] This application provides a ventilator comprising: an oxygen supply line for providing oxygen; an air supply line for providing air; an air-oxygen mixing chamber, the air inlet of which is connected to the oxygen supply line and the air supply line respectively; and a piezoelectric valve disposed on the air supply line between the air outlet of the air-oxygen mixing chamber and the patient interface, for controlling the frequency and flow rate of airflow delivered to the patient interface.

[0006] In one embodiment, the piezoelectric valve includes: a valve body and a piezoelectric element, wherein the valve body has an air chamber and the piezoelectric element passes through the air chamber; the valve body has an air inlet and an air outlet connected to the air chamber, the air inlet being connected to the air outlet of the air-oxygen mixing chamber and the air outlet being connected to the patient interface; and a drive assembly disposed outside the valve body, wherein the drive assembly generates a voltage when energized, causing the piezoelectric element to move toward the air inlet or the air outlet, thereby generating an oscillating airflow in the air chamber.

[0007] In one embodiment, the air inlet and the air outlet are located on the same side wall of the valve body.

[0008] In one embodiment, one end of the piezoelectric element is a fixed end, which is fixedly connected to the valve body; the other end is a free end.

[0009] In one embodiment, the fixed end is disposed corresponding to the air inlet, and when the fixed end moves toward the air inlet, it can cover the air inlet; the free end is disposed corresponding to the air outlet, and when the free end moves toward the air outlet, it can cover the air outlet.

[0010] In one embodiment, a sealing gasket is provided on the side of the fixed end near the air inlet.

[0011] In one embodiment, the fixed end is connected to the valve body via a connecting mechanism, the connecting mechanism including a limiting nut, one end of which is connected to the side wall of the valve body, and the other end is connected to the fixed end.

[0012] In one embodiment, the connecting mechanism further includes an elastic element, one end of which abuts against the limiting nut, and the other end of which abuts against the side of the fixed end away from the air inlet.

[0013] In one embodiment, the connecting mechanism further includes a sealing ring, which is sleeved on the limiting nut and disposed between the limiting nut and the side wall of the valve body.

[0014] In one embodiment, the operating voltage range of the drive component is 0-310V.

[0015] The beneficial effects of this invention are as follows: By using a piezoelectric valve instead of a traditional mechanical high-frequency generator, and utilizing the deformation of piezoelectric materials under the action of an electric field to generate oscillating airflow, the mechanical structure is simplified, thereby avoiding wear and failure of mechanical parts and significantly improving the reliability and service life of the ventilator. The piezoelectric valve itself does not generate heat, eliminating the temperature rise problem, thus greatly reducing the power consumption of the ventilator and improving performance and energy efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the ventilator airway principle provided in the embodiments of this application;

[0018] Figure 2 This is a schematic diagram of the piezoelectric valve provided in the embodiments of this application;

[0019] Figure 3 A cross-sectional structural schematic diagram of the piezoelectric valve body provided in an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the structure of the piezoelectric sheet and the connecting mechanism provided in the embodiments of this application.

[0021] Icons: 1-Oxygen path; 11-First filter; 12-First pressure sensor; 13-First check valve; 14-First flow sensor; 15-First proportional valve; 2-Air path; 21-Second filter; 22-Second pressure sensor; 23-Second flow sensor; 24-Turbine; 25-Silencer; 26-First temperature sensor; 3-Main air path; 31-Air-oxygen mixing module; 311-Air-oxygen mixing chamber; 312-Second temperature sensor; 313-Second check valve; 314-Third flow sensor; 315-Third pressure sensor; 316-Flow regulating valve; 317-Oxygen concentration sensor; 32-Piezoelectric valve; 321-Valve body; 3211-Gas chamber; 3212-Inlet port; 3 213 - Air outlet; 322 - Piezoelectric element; 3221 - Fixed end; 3222 - Free end; 3223 - Sealing gasket; 323 - Drive assembly; 324 - Connecting mechanism; 3241 - Limit nut; 3242 - Elastic element; 3243 - Sealing ring; 33 - Safety module; 331 - First electromagnetic switch valve; 34 - Patient sensing module; 341 - Patient flushing valve; 342 - First air resistance; 343 - Second air resistance; 344 - Third one-way valve; 345 - Fourth one-way valve; 346 - Fourth pressure sensor; 347 - Fifth pressure sensor; 35 - Exhalation module; 351 - External exhalation valve; 36 - Nebulization module; 361 - Second electromagnetic switch valve; 362 - Third air resistance; 37 - Patient interface. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Figure 1 This is a schematic diagram of the ventilator airway principle provided in the embodiments of this application, such as... Figure 1 As shown, a ventilator includes: an oxygen supply line 1 for providing oxygen; an air supply line 2 for providing air; an air-oxygen mixing chamber 311, the air inlet of which is connected to the oxygen supply line 1 and the air supply line 2 respectively; and a piezoelectric valve 32, which is disposed on the air supply line between the air outlet of the air-oxygen mixing chamber 311 and the patient interface 37, for controlling the frequency and flow rate of the airflow delivered to the patient interface 37.

[0026] Specifically, oxygen supply path 1 is used to deliver oxygen from an oxygen source to the air-oxygen mixing chamber 311. Air supply path 2 is used to deliver air from an air source to the air-oxygen mixing chamber 311. The air-oxygen mixing chamber 311 is the junction of oxygen supply path 1 and air supply path 2, with its inlet connected to both. Inside the air-oxygen mixing chamber 311, oxygen and air are mixed to form a gas mixture suitable for the patient's needs. The mixed gas is then output through the outlet of the air-oxygen mixing chamber 311.

[0027] A piezoelectric valve 32 replaces the traditional high-frequency generator to generate oscillating airflow. The piezoelectric valve 32 is installed in the air path between the outlet of the air-oxygen mixing chamber 311 and the patient interface 37. Through the deformation of the piezoelectric material, the piezoelectric valve 32 can achieve rapid opening and closing action, thereby precisely controlling the frequency and flow rate of the airflow delivered to the patient interface 37.

[0028] In one embodiment, Figure 2 This is a schematic diagram of the piezoelectric valve provided in the embodiments of this application, combined with... Figure 1 and Figure 2 As shown, the piezoelectric valve 32 includes a valve body 321, a piezoelectric element 322, and a drive assembly 323. The valve body 321 has an air chamber 3211 inside, and the piezoelectric element 322 passes through the air chamber 3211. The valve body 321 has an air inlet 3212 and an air outlet 3213 connected to the air chamber 3211. The air inlet 3212 is connected to the air outlet of the air-oxygen mixing chamber 311, and the air outlet 3213 is connected to the patient interface 37. The drive assembly 323 is located outside the valve body 321. When energized, the drive assembly 323 generates voltage, causing the piezoelectric element 322 to move towards the air inlet 3212 or the air outlet 3213, thereby generating an oscillating airflow within the air chamber 3211.

[0029] Specifically, the valve body 321 is the main structure of the piezoelectric valve 32, and has an internal air chamber 3211 for accommodating the piezoelectric element 322 and gas. The valve body 321 has an air inlet 3212 and an air outlet 3213, which are respectively used to connect the air outlet of the air-oxygen mixing chamber 311 and the patient interface 37. The piezoelectric element 322 is inserted into the air chamber 3211 within the valve body 321. The piezoelectric element 322 can deform under the action of an electric field, thereby controlling the airflow. The drive assembly 323 is located outside the valve body 321 and is used to provide electrical energy to the piezoelectric element 322. When the drive assembly 323 is energized, a voltage is generated, causing the piezoelectric element 322 to deform.

[0030] When the drive component 323 is energized, a voltage is generated and applied to the piezoelectric element 322. Under the influence of the voltage, the piezoelectric element 322 deforms, specifically by bending or stretching. This deformation changes its position within the air chamber 3211, causing it to move towards the air inlet 3212 or the air outlet 3213. When the piezoelectric element 322 moves towards the air inlet 3212, airflow is guided into the air chamber 3211; when it moves towards the air outlet 3213, airflow is guided out of the air chamber 3211. By rapidly changing the magnitude and frequency of the voltage applied to the piezoelectric element 322, pressure and pressure reduction can be achieved, changing the amount of deformation and enabling the piezoelectric element 322 to reciprocate. This reciprocating motion generates an oscillating airflow within the air chamber 3211, thereby achieving precise control and regulation of the airflow.

[0031] The piezoelectric valve 32 can quickly respond to voltage changes in the drive component 323, enabling precise control of airflow frequency and flow rate to meet different respiratory needs of patients. Compared with traditional mechanical valves, the piezoelectric valve 32 consumes almost no energy during operation and does not generate mechanical noise, which helps to reduce the power consumption and noise level of the ventilator.

[0032] In one embodiment, the air inlet 3212 and the air outlet 3213 are disposed on the same side wall of the valve body 321.

[0033] Specifically, placing the air inlet 3212 and the air outlet 3213 on the same sidewall simplifies the airflow design inside the valve body 321, reduces the detour path of airflow within the valve body 321, thereby reducing airflow resistance and improving airflow transmission efficiency. This design makes the airflow more compact, reduces the space occupied inside the valve body 321, and helps to achieve miniaturization of the equipment.

[0034] In other embodiments, the air inlet 3212 and the air outlet 3213 can also be located on different sidewalls of the valve body 321. This layout can be adjusted according to specific airflow design requirements, such as when a more complex airflow path or a more optimized spatial layout is needed. Different sidewall arrangements can provide more design freedom to adapt to different application scenarios.

[0035] In one embodiment, one end of the piezoelectric element 322 is a fixed end 3221, which is fixedly connected to the valve body 321; the other end is a free end 3222.

[0036] Specifically, the fixed end 3221 of the piezoelectric element 322 is fixedly connected to the valve body 321, serving as a support and positioning element. The presence of the fixed end 3221 ensures that the piezoelectric element 322 maintains a stable base point during operation, thereby ensuring the accuracy and consistency of its deformation. The design of the fixed end 3221 also prevents unnecessary displacement or vibration of the piezoelectric element 322 during operation, improving the stability and reliability of the system.

[0037] The free end 3222 of the piezoelectric element 322 is the main part of the piezoelectric element 322 that deforms under the action of an electric field. When a voltage is applied to the piezoelectric element 322, the free end 3222 will bend or extend, thereby changing its position within the air chamber 3211. The movement of the free end 3222 can directly affect the on / off state and flow rate of the airflow, achieving precise control of the airflow. By rapidly changing the magnitude and frequency of the voltage applied to the piezoelectric element 322, the free end 3222 can reciprocate, thereby generating an oscillating airflow within the air chamber 3211.

[0038] In one embodiment, Figure 3 This is a cross-sectional structural diagram of the piezoelectric valve 32 body provided in the embodiments of this application, as shown below. Figure 3 As shown, the fixed end 3221 is set to correspond to the air inlet 3212. When the fixed end 3221 moves toward the air inlet 3212, it can cover the air inlet 3212. The free end 3222 is set to correspond to the air outlet 3213. When the free end 3222 moves toward the air outlet 3213, it can cover the air outlet 3213.

[0039] Specifically, the fixed end 3221 corresponds to the air inlet 3212 and is located near the air inlet 3212. This arrangement allows the fixed end 3221 to directly affect the state of the air inlet 3212 when it moves. When the fixed end 3221 moves toward the air inlet 3212 and covers the air inlet 3212, it can prevent airflow from entering the air chamber 3211, thereby closing the air inlet 3212.

[0040] The free end 3222 corresponds to and is located near the air outlet 3213. This arrangement allows the free end 3222 to directly affect the state of the air outlet 3213 during movement. When the free end 3222 moves toward and covers the air outlet 3213, it can prevent airflow from exiting the air chamber 3211, thus closing the air outlet 3213.

[0041] This design enables the piezoelectric valve 32 to precisely control the inflow and outflow of air, ensuring that the airflow on / off state meets the requirements. This is crucial for the high-frequency oscillatory ventilation function of the ventilator and ensures that different respiratory needs of patients are met.

[0042] In one embodiment, a sealing gasket 3223 is provided on the side of the fixed end 3221 of the piezoelectric valve 32 near the air inlet 3212.

[0043] Specifically, the sealing gasket 3223 is typically made of flexible materials, such as polytetrafluoroethylene (PTFE) or other high-temperature and corrosion-resistant elastic materials. These materials possess excellent sealing performance and mechanical stability, maintaining a good seal under high pressure and high-frequency operation. During movement, the stationary end 3221 tightly covers the air inlet 3212 via the sealing gasket 3223, thus sealing the air inlet 3212 and preventing gas leakage. This sealing design ensures precise airflow control, avoiding inaccurate control due to gas leakage. Furthermore, the flexible material of the sealing gasket 3223 absorbs some mechanical impact, reducing direct friction between the stationary end 3221 and the air inlet 3212, thereby improving the reliability and lifespan of the ventilator.

[0044] In other embodiments, the free end 3222 is fitted with a rubber sleeve. The rubber sleeve is typically made of a highly elastic rubber material, possessing good flexibility and resilience. This material provides good fit during movement of the free end 3222, while protecting it from mechanical damage. When the free end 3222 moves towards the vent 3213, the rubber sleeve tightly covers the vent 3213, preventing gas leakage. Simultaneously, the elasticity of the rubber sleeve absorbs some mechanical impact, reducing direct friction between the free end 3222 and the vent 3213.

[0045] In one embodiment, the fixed end 3221 is connected to the valve body 321 through a connecting mechanism 324. The connecting mechanism 324 includes a limiting nut 3241, one end of which is connected to the side wall of the valve body 321, and the other end is connected to the fixed end 3221.

[0046] Specifically, the limiting nut 3241 is typically made of high-strength materials, such as stainless steel or alloys, to ensure its mechanical strength and durability under high pressure and high-frequency motion conditions. The fixed end 3221 is connected to the side wall via the limiting nut 3241. This connection method ensures the stability of the fixed end 3221 during operation, allowing it to be precisely fixed in a predetermined position while permitting some directional movement without excessive movement.

[0047] In one embodiment, the connecting mechanism 324 further includes an elastic element 3242, one end of which abuts against the limiting nut 3241, and the other end abuts against the side of the fixed end 3221 away from the air inlet 3212.

[0048] Specifically, the elastic element 3242 provides a buffering force, ensuring that the fixed end 3221 has a certain degree of flexibility and buffering capacity during movement. Furthermore, the reset function of the elastic element 3242 ensures that the fixed end 3221 automatically returns to its initial position after movement, improving the stability and reliability of the system. The elastic element 3242 is typically made of a material with good elasticity, such as spring steel, rubber, or polyurethane. These materials have good elastic recovery and mechanical stability, providing appropriate buffering and restoring force when the fixed end 3221 moves.

[0049] In other embodiments, the two ends of the elastic element 3242 are fixedly connected to the fixed end 3221 and the valve body 321, respectively. This fixed connection method ensures that the elastic element 3242 can stably provide positioning and buffering force during operation, without the need for the limiting nut 3241. The elastic element 3242 can be a spring or an elastic bending element, such as an elastic rod or an elastic sheet.

[0050] In one embodiment, Figure 4 This is a schematic diagram of the structure of the piezoelectric sheet 322 and the connecting mechanism 324 provided in the embodiments of this application, combined with... Figure 3 and Figure 4 As shown, the connecting mechanism 324 also includes a sealing ring 3243, which is sleeved on the limiting nut 3241 and disposed between the limiting nut 3241 and the side wall of the valve body 321.

[0051] Specifically, the main function of the sealing ring 3243 is to prevent gas leakage. By tightly fitting the limit nut 3241 and the side wall of the valve body 321, the sealing ring 3243 effectively prevents gas leakage from the connection, ensuring precise airflow control. The sealing ring 3243 is typically made of a highly elastic material, such as rubber, polytetrafluoroethylene (PTFE), or other high-temperature and corrosion-resistant elastic materials. These materials possess excellent sealing performance and mechanical stability, maintaining a good sealing effect under high pressure and high-frequency operation conditions.

[0052] In one embodiment, the operating voltage range of the drive component 323 is 0-310V.

[0053] Specifically, conventional piezoelectric valves 32 have piezoelectric elements 322 with small deformation and insufficient pressure, typically operating within a voltage range of 0-24V. This relatively low voltage range limits the deformation of the piezoelectric element 322, thus restricting its use in high-precision applications such as high-frequency oscillation ventilation. The piezoelectric proportional valve in this application operates within a voltage range of 0-310V. This higher voltage range allows the piezoelectric element 322 to achieve greater deformation, thereby providing higher pressure and a wider flow control range. This design not only improves the performance of the piezoelectric valve 32 but also enables it to adapt to a wider range of applications.

[0054] In certain specialized applications, higher voltages may be required to achieve greater deformation. By appropriately adjusting the material and structure of the piezoelectric element 322, the voltage range can be further extended to meet higher performance requirements.

[0055] In one embodiment, the oxygen circuit 1 is provided with an oxygen (O2) source, a first filter 11, a first pressure sensor 12, a first one-way valve 13, a first flow sensor 14, and a first proportional valve 15. The first filter 11 is used to filter impurities in the oxygen source. The first one-way valve 13 can prevent the gas inside the exhaler from backflowing to the external gas source. The first pressure sensor 12 is used to monitor the pressure of the oxygen circuit 1. The first proportional valve 15 can control the oxygen flow rate. The first flow sensor 14 and the first proportional valve 15 cooperate to control the oxygen supply in a closed loop.

[0056] In one embodiment, the air passage 2 is provided with an air source, a second filter 21, a second pressure sensor 22, a second flow sensor 23, a turbine 24, and a muffler 25. The second filter 21 is located at the air inlet and is used to filter impurities in the air. The second flow sensor 23 is used to monitor the flow rate at the air inlet. The turbine 24 can draw in air from the environment through negative pressure. At the same time, a first temperature sensor 26 is provided at the turbine 24 to monitor the temperature of the turbine 24 to prevent the equipment temperature from getting too high. The muffler 25 is used to reduce the noise of the turbine 24. The second pressure sensor 22 is used to monitor the pressure of the air passage 2.

[0057] In one embodiment, the air passage between the outlet of the air-oxygen mixing chamber 311 and the patient interface 37 is the main air passage 3, and the main air passage 3 is provided with an air-oxygen mixing module 31, a piezoelectric valve 32, and a safety module 33 in sequence.

[0058] The air-oxygen mixing module 31 includes an air-oxygen mixing chamber 311, a second temperature sensor 312, a second one-way valve 313, a third flow sensor 314, a third pressure sensor 315, a flow regulating valve 316, and an oxygen concentration sensor 317, which are connected in sequence.

[0059] A piezoelectric valve 32 is installed in the gas path between the air-oxygen mixing module 31 and the safety module 33. One end of the safety module 33 is connected to the piezoelectric valve 32, and the other end is connected to the patient interface 37. The safety module 33 includes a first solenoid switch valve 331, which is used to open when the gas path is blocked to ensure patient safety.

[0060] In one embodiment, the ventilator further includes a patient sensing module 34 and an exhalation module 35.

[0061] Specifically, one end of the patient sensing module 34 is connected to the outlet of the air-oxygen mixing chamber 311, and the other end is connected to the patient interface 37. The patient sensing module 34 includes a patient flushing valve 341, a first air resistance 342 and a second air resistance 343, a third one-way valve 344 and a fourth one-way valve 345, a fourth pressure sensor 346 and a fifth pressure sensor 347. The patient flushing valve 341 is normally closed and can be ventilated to flush the pipeline when no patient is connected. The first air resistance 342 and the second air resistance 343, the third one-way valve 344 and the fourth one-way valve 345 are used to prevent pipeline contamination. The fourth pressure sensor 346 and the fifth pressure sensor 347 are used to measure the airway pressure during ventilation. The pressure sensors reference each other to ensure that the patient's airway pressure is correct.

[0062] The exhalation module 35 includes an external exhalation valve 351 for expelling the patient's exhaled gas, and a patient connection interface 37 for the external exhalation valve 351 having an outlet for expelling gas to the outside.

[0063] In another embodiment, one end of the exhalation module 35 is connected to the outlet of the air-oxygen mixing chamber 311, and the other end is connected to the patient interface 37 (not shown in the figure). The function of the exhalation module 35 is to measure and control the pressure and flow rate during the patient's exhalation process. The exhalation module 35 includes a hose, an exhalation control valve, and an external exhalation valve 351, which is used to close when the patient inhales to ensure the pressure in the tubing, and to partially open when the patient exhales to maintain positive end-expiratory pressure. It can be connected to the external exhalation valve 351 from the hose.

[0064] In one embodiment, the ventilator further includes a nebulization module 36, one end of which is connected to the gas source inlet of the oxygen gas path 1, and the other end is connected to the patient interface 37 for nebulizing gas. The nebulization module 36 includes a second electromagnetic switch valve 361 and a third air resistance 362 connected in sequence, the third air resistance 362 being responsible for regulating the pressure of the nebulized oxygen gas flow.

[0065] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0066] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A ventilator, characterized in that, include: Oxygen supply line, used to provide oxygen; Air supply line, used to provide air; An air-oxygen mixing chamber, wherein the air inlet of the air-oxygen mixing chamber is connected to the oxygen gas path and the air gas path respectively; A piezoelectric valve is disposed in the air path between the outlet end of the air-oxygen mixing chamber and the patient interface, and is used to control the frequency and flow rate of the airflow delivered to the patient interface.

2. The ventilator according to claim 1, characterized in that, The piezoelectric valve includes: The valve body and the piezoelectric element are provided. The valve body is provided with an air chamber, and the piezoelectric element is inserted through the air chamber. The valve body is provided with an air inlet and an air outlet that connect to the air chamber. The air inlet is connected to the air outlet of the air-oxygen mixing chamber, and the air outlet is connected to the patient interface. A drive assembly is disposed outside the valve body. When the drive assembly is energized, it generates a voltage to cause the piezoelectric sheet to move toward the air inlet or outlet, thereby generating an oscillating airflow in the air chamber.

3. The ventilator according to claim 2, characterized in that, The air inlet and the air outlet are located on the same side wall of the valve body.

4. The ventilator according to claim 2, characterized in that, One end of the piezoelectric element is a fixed end, which is fixedly connected to the valve body; the other end is a free end.

5. The ventilator according to claim 4, characterized in that, The fixed end is provided corresponding to the air inlet, and when the fixed end moves toward the air inlet, it can cover the air inlet; The free end is positioned corresponding to the air outlet, and when the free end moves toward the air outlet, it can cover the air outlet.

6. The ventilator according to claim 5, characterized in that, A sealing gasket is provided on the side of the fixed end near the air inlet.

7. The ventilator according to claim 4, characterized in that, The fixed end is connected to the valve body through a connecting mechanism, which includes a limiting nut. One end of the limiting nut is connected to the side wall of the valve body, and the other end is connected to the fixed end.

8. The ventilator according to claim 7, characterized in that, The connecting mechanism also includes an elastic element, one end of which abuts against the limiting nut, and the other end abuts against the side of the fixed end away from the air inlet.

9. The ventilator according to claim 7, characterized in that, The connecting mechanism also includes a sealing ring, which is sleeved on the limiting nut and disposed between the limiting nut and the side wall of the valve body.

10. The ventilator according to any one of claims 2-9, characterized in that, The operating voltage range of the drive component is 0-310V.

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