Air flow regulator and ventilator

Abstract

The present application provides an air flow regulating device for a ventilator, the air flow regulating device comprising a conducting member and a regulating member. The conducting member comprises a ventilation valve mouth and an elastic valve body, the ventilation valve mouth is used to communicate with a mixing chamber, so that the filtered air enters the mixing chamber through the ventilation valve mouth under the action of a compression device; the elastic valve body is installed on the side of the ventilation valve mouth away from the mixing chamber structure, and the elastic valve body can expand and contract; the regulating member can control the flow rate of the filtered air entering the mixing chamber by controlling the distance between the elastic valve body and the ventilation valve mouth. The present application also provides a ventilator, comprising a connected mixing chamber structure and a compression device, and the above-mentioned air flow regulating device. The scheme of the present application can control the speed of the gas entering or flowing out of the elastic valve body through the regulating member, so as to continuously, flexibly and accurately control the volume of the elastic valve body, thereby continuously, flexibly and accurately controlling the flow rate of the filtered air entering the mixing chamber.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to an air flow regulating device and a ventilator having the air flow regulating device. Background Art

[0002] The ventilator is one of the most important medical devices today. When the ventilator is working, it needs to mix oxygen and filtered air in proportion and input them into the human body. Conventional ventilators can only control the opening and closing of the air channel, but cannot flexibly and continuously control the flow rate of filtered air, which cannot meet medical needs. Summary of the invention

[0003] The present application provides an air flow regulating device for a ventilator, wherein the ventilator comprises a connected mixing chamber structure and a compression device, wherein the compression device is used to make the air pressure in the mixing chamber of the mixing chamber structure a negative pressure.

[0004] The air flow regulating device includes a conducting member and a regulating member, and the conducting member includes a ventilation valve mouth and an elastic valve body; the ventilation valve mouth is used to communicate with the mixing chamber so that the filtered air enters the mixing chamber through the ventilation valve mouth under the action of the compression device; the elastic valve body is installed on the side of the ventilation valve mouth away from the mixing chamber structure, and the elastic valve body can expand and contract.

[0005] The adjusting member is used to expand the elastic valve body and move it closer to the ventilation valve mouth to reduce the flow of filtered air entering the ventilation valve mouth; the adjusting member is also used to shrink the elastic valve body and move it away from the ventilation valve mouth to increase the flow of filtered air entering the ventilation valve mouth.

[0006] The solution of the present application can control the speed of gas entering or flowing out of the elastic valve body through the regulating member to continuously, flexibly and accurately control the volume of the elastic valve body, thereby continuously, flexibly and accurately controlling the flow rate of filtered air entering the mixing chamber.

[0007] Among them, the adjusting member includes a first interface, a second interface and a third interface; the first interface is connected to the elastic valve body; the second interface is used to communicate with the atmosphere; the third interface is used to communicate with the mixing chamber; the adjusting member is used to connect the second interface with the first interface and disconnect the third interface from the first interface, so that the elastic valve body expands and approaches the ventilation valve mouth; the adjusting member is also used to connect the third interface with the first interface and disconnect the second interface from the first interface, so that the elastic valve body shrinks and moves away from the ventilation valve mouth.

[0008] Among them, the adjusting member includes a coil winding, a first piston, a second piston and an electromagnetic assembly; the opposite ends of the first piston are respectively connected to the coil winding and the second piston, and the electromagnetic assembly is used to drive the coil winding to move through electromagnetic force, so that the coil winding drives the first piston and the second piston to move; the first piston is close to the second interface, and the second piston is close to the third interface; the first piston and the second piston can move between a position where the second interface is connected to the first interface and the third interface is disconnected from the first interface, and a position where the third interface is connected to the first interface and the second interface is disconnected from the first interface.

[0009] Wherein, the adjusting member comprises an elastic member, the elastic member is connected to an end of the second piston away from the first piston, and the elastic member is used to provide elastic force to the second piston.

[0010] The elastic valve body is a hollow structure surrounded by flexible material.

[0011] Wherein, the flexible material is a silicone material or a latex material.

[0012] The elastic valve body is filled with a resilient filling material, which can elastically shrink, provide a resilient force for the volume change of the elastic valve body, and has a high compression load ratio, and is relatively good in heat aging, wet aging and dynamic fatigue resistance, thereby extending the service life of the elastic valve body.

[0013] The vent valve mouth is funnel-shaped, the end with a smaller diameter of the vent valve mouth is close to the elastic valve body, and the end with a larger diameter of the vent valve mouth is used to communicate with the mixing chamber.

[0014] Among them, the conductive part includes a mounting wall connected to the ventilation valve mouth, the mounting wall surrounds the outer periphery of the ventilation valve mouth and forms a conductive cavity, and the mounting wall is used to connect with the mixing chamber structure; the conductive cavity is used to allow filtered air to enter; when there is a distance between the elastic valve body and the end with a smaller diameter of the ventilation valve mouth, the conductive cavity is connected to the end with a smaller diameter of the ventilation valve mouth.

[0015] A ventilator comprises a mixing chamber structure and a compression device connected to each other, and the above-mentioned air flow regulating device; the mixing chamber structure comprises a mixing chamber, the mixing chamber is connected to a third interface of the air flow regulating device and a ventilation valve nozzle; the compression device is connected to the mixing chamber, and the compression device is used to make the air pressure in the mixing chamber negative pressure.

[0016] The solution of the present application can control the speed of gas entering or flowing out of the elastic valve body through the regulating member to continuously, flexibly and accurately control the volume of the elastic valve body, thereby continuously, flexibly and accurately controlling the flow rate of filtered air entering the mixing chamber.

[0017] Among them, the ventilator includes a frame, the frame has a frame channel, and the frame channel is connected to the first interface of the air flow regulating device; the conductive part of the air flow regulating device is located between the frame and the mixing chamber structure, the conductive part includes a mounting wall and a ventilation valve mouth connected to the mounting wall, the mounting wall surrounds the outer periphery of the ventilation valve mouth and forms a conductive cavity, the mounting wall is installed on the frame and connected to the mixing chamber structure; the conductive cavity is used for filtered air to enter; when there is a distance between the elastic valve body and the ventilation valve mouth, the conductive cavity is connected to the ventilation valve mouth; the elastic valve body includes a top, an elastic telescopic part and an elastic buckle, the elastic telescopic part is connected between the top and the elastic buckle, the elastic telescopic part surrounds the edge of the top, the top is close to the ventilation valve mouth, and the elastic buckle forms a detachable buckle connection with the frame; the top, the elastic telescopic part and the elastic buckle form an elastic valve body cavity, and the elastic valve body cavity is connected to the frame channel.

[0018] The ventilator includes an oxygen flow regulating device, which is connected to the mixing chamber and is used to regulate the flow of oxygen entering the mixing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the structural features and effects of the present invention, it is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 1 is a schematic diagram of the overall structure of a ventilator according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure of the air flow regulating device;

[0022] Figure 3 yes Figure 2 A schematic diagram of a first conduction state of the regulating member;

[0023] Figure 4 yes Figure 2 A schematic diagram of a second conduction state of the regulating member;

[0024] Figure 5 yes Figure 2 Schematic diagram of a third conduction state of the regulating member;

[0025] Figure 6 yes Figure 1 A cross-sectional view of the installation of some components of the ventilator;

[0026] Figure 7 yes Figure 6 Schematic diagram of the elastic valve body structure. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0028] Figure 1 Schematic block diagram of the structure of the ventilator 10 of this embodiment. Figure 1 As shown, the ventilator 10 includes an air channel 1, an air flow regulating device 2, an oxygen channel 3, an oxygen flow regulating device 4, a mixing chamber structure 5 and a compression device 6.

[0029] The air channel 1 is a channel for conveying filtered air, and the air channel 1 can be connected to an air source that can provide filtered air. The inside of the air channel 1 can be in an atmospheric pressure state, that is, the air pressure in the air channel 1 can be consistent with the atmospheric pressure.

[0030] One end of the air flow regulating device 2 is connected to the air channel 1, and the other end is connected to the mixing chamber structure 5 to be described below. The filtered air delivered by the air channel 1 can enter the mixing chamber structure 5 through the air flow regulating device 2. In the process of the filtered air entering the mixing chamber structure 5, the air flow regulating device 2 serves as a control component of the air channel 1, and is used to adjust the flow of the filtered air, so that the flow of the filtered air entering the mixing chamber structure 5 meets the corresponding requirements.

[0031] The oxygen channel 3 is a channel for transporting oxygen, and the oxygen channel 3 is connected to an oxygen source. Since the oxygen source can be in a high pressure state (i.e., the pressure in the oxygen source is greater than the atmospheric pressure), when oxygen passes through the oxygen channel 3, the internal pressure of the oxygen channel 3 can be greater than the atmospheric pressure.

[0032] The oxygen flow regulating device 4 is a component for regulating the oxygen flow. Schematically, the oxygen flow regulating device 4 can be a two-position three-way valve. One end of the oxygen flow regulating device 4 is connected to the oxygen channel 3, and the other end is connected to the mixing chamber structure 5. The oxygen transported by the oxygen channel 3 can enter the mixing chamber structure 5 through the oxygen flow regulating device 4. The oxygen flow regulating device 4 can adjust the flow of oxygen, so that the flow of oxygen entering the mixing chamber structure 5 meets the corresponding requirements.

[0033] The mixing chamber structure 5 is a place where oxygen and filtered air are mixed. The mixing chamber structure 5 is a hollow structure, and the mixing chamber structure 5 is connected to the air flow regulating device 2 and the oxygen flow regulating device 4, so that the filtered air and oxygen can flow into the mixing chamber structure 5 and be fully mixed in the mixing chamber structure 5.

[0034] The compression device 6 is connected to the mixing chamber structure 5. The compression device 6 is used to adjust the internal air pressure of the mixing chamber structure 5 so that the inside of the mixing chamber structure 5 is in a negative pressure state, thereby drawing filtered air and oxygen into the mixing chamber structure 5. By adjusting the working state of the compression device 6, such as the power, the flow rate of filtered air or oxygen entering the mixing chamber structure 5 can be changed. The compression device 6 can also extract the mixed gas in the mixing chamber structure 5, compress the mixed gas, and output it to the user. Schematically, the compression device 6 is a turbo fan.

[0035] The working principle of the ventilator 10 is:

[0036] The compression device 6 works to make the inside of the mixing chamber structure 5 in a negative pressure state. At this time, the filtered air can be sucked into the mixing chamber structure 5 through the air channel 1 and the air flow regulating device 2. Among them, the air flow regulating device 2 regulates the flow of the filtered air, for example, the air flow regulating device 2 can regulate the flow of the filtered air to 0, any intermediate value or the maximum value.

[0037] Oxygen passes through the oxygen flow regulating device 4 and enters the mixing chamber structure 5. The oxygen flow regulating device 4 regulates the flow of oxygen. For example, the oxygen flow regulating device 4 can regulate the flow of oxygen to 0, any intermediate value or the maximum value.

[0038] The filtered air entering the mixing chamber structure 5 is mixed with oxygen to form a mixed gas that meets the requirements. The mixed gas is output to the user by the compression device 6.

[0039] Conventional ventilators can only adjust the on-off state of the air channel and cannot arbitrarily control the air flow rate. Therefore, the flow adjustment function of conventional ventilators has great limitations and cannot meet medical needs.

[0040] In this embodiment, by designing the air flow regulating device 2 and the oxygen flow regulating device 4, the flow of filtered air and oxygen entering the mixing chamber structure 5 can be flexibly adjusted, thereby eliminating the need to control the flow by frequently adjusting the power of the compression device 6.

[0041] The framework structure and working principle of the ventilator are described above, and the air flow regulating device 2 will be described in detail below.

[0042] like Figure 2 As shown, the air flow regulating device 2 may include a regulating member 22 and a conducting member 21, which are connected to each other. Preferably, the regulating member 22 may be a two-position three-way valve.

[0043] like Figure 2 and Figure 3As shown, the adjusting member 22 may include a first interface 221 , a second interface 222 , a third interface 223 , a piston 224 , an electromagnetic assembly 225 , a coil winding 226 and an elastic member 227 .

[0044] like Figure 1~Figure 3 As shown, the first interface 221, the second interface 222, and the third interface 223 are spaced apart. The first interface 221 is used to connect the conductive member 21. The second interface 222 is used to connect the atmosphere, and the air pressure in the second interface 222 is in the atmospheric pressure state. The third interface 223 is used to connect the mixing chamber structure 5, and under the negative pressure of the mixing chamber structure 5, the air pressure in the third interface 223 is in the negative pressure state.

[0045] like Figure 3 As shown, the piston 224 may include a first piston 224a and a second piston 224b, and the first piston 224a and the second piston 224b may be rigidly connected, and the distance between the two is fixed. The first piston 224a may be close to the second interface 222, and the second piston 224b may be close to the third interface 223. The piston 224 may move to different positions, so that the overlapping area between the first piston 224a and the second interface 222, and the overlapping area between the second piston 224b and the third interface 223 are changed, that is, the opening size between the second interface 222 and the third interface 223 is changed.

[0046] like Figure 3 As shown, the electromagnetic assembly 225 is used to generate an electromagnetic effect on the coil winding 226. When the electromagnetic assembly 225 is powered on, the electromagnetic force generated by the electromagnetic assembly 225 drives the coil winding 226 to move, for example, Figure 3 In the perspective shown, the coil winding 226 can move in the horizontal direction. The coil winding 226 can be connected to the first piston 224a. The coil winding 226 can apply force to the first piston 224a, thereby driving the piston 224 to move.

[0047] like Figure 3 As shown, the elastic member 227 can be connected to the second piston 224b, and the elastic member 227 can provide an elastic force to the second piston 224b, and the direction of the elastic force can be opposite to the force of the coil winding 226 on the first piston 224a. The elastic member 227 can be, for example, a spring. In other embodiments, the elastic member 227 may not be provided.

[0048] The working principle of the adjusting member 22 is as follows: after the electromagnetic component 225 is powered on, it can drive the coil winding 226 to move, thereby driving the piston 224 to move. The spring 227 provides elastic force to the piston 224. Under the joint action of the coil winding 226 and the spring 227, the piston 224 can move stably and remain in the set position; after the electromagnetic component 225 loses power, the spring 227 rebounds, causing the piston 224 to return to the default position.

[0049] like Figure 3 As shown, when the first piston 224a is at the left extreme position, the second interface 222 is connected to the first interface 221, and the second piston 224b is located between the first interface 221 and the third interface 223, so that the third interface 223 is disconnected from the first interface 221. Therefore, the second interface 222 is connected to the first interface 221 to form a first channel. Since the second interface 222 and the first interface 221 are completely unobstructed, the opening area of ​​the two is the largest, so the caliber of the first channel formed by the second interface 222 and the first interface 221 is the largest, so that the flow rate of the gas flowing through the first channel is the largest.

[0050] like Figure 4 As shown, when the first piston 224a moves to the middle position, the third interface 223 remains disconnected from the first interface 221. A portion of the second interface 222 is blocked by the first piston 224a, but the second interface 222 is still connected to the first interface 221. However, at this time, the caliber of the first channel formed by the second interface 222 and the first interface 221 becomes smaller, so that the flow rate of the gas flowing through the first channel is reduced. It can be understood that the area of ​​the second interface 222 blocked by the first piston 224a can be adjusted to any value as needed, so the caliber of the first channel formed by the second interface 222 and the first interface 221 can also be any value, so that the flow rate of the gas flowing through the first channel can be any value.

[0051] like Figure 5 As shown, when the second piston 224b is at the right extreme position, the first piston 224a is located between the second interface 222 and the first interface 221, and the second interface 222 is disconnected from the first interface 221. The third interface 223 is connected to the first interface 221, so the third interface 223 and the first interface 221 are connected to form a second channel. Since the third interface 223 and the first interface 221 are completely unblocked, the opening area of ​​the two is the largest, so the caliber of the second channel formed by the third interface 223 and the first interface 221 is the largest, so that the flow rate of the gas flowing through the second channel is the largest.

[0052] In other embodiments, other methods may be used to replace the electromagnetic assembly 225, the coil winding 226 and the elastic member 227 to adjust the connection and disconnection between the second interface 222 and the first interface 221, and the connection and disconnection between the third interface 223 and the first interface 221. In this embodiment, the regulating member 22 is not limited to a two-position three-way valve, and any device that can control the connection and disconnection between the inside of the elastic valve body 211 and the air, or between the inside of the elastic valve body 211 and the mixing chamber 5a is within the scope of this embodiment.

[0053] Figure 6 It can represent the cross-sectional assembly structure of the conductive member 21 and other components in the ventilator 10. Figure 6As shown, the conducting member 21 may be located between the mixing chamber structure 5 and the frame 7. The mixing chamber structure 5 has a mixing chamber 5a. The frame 7 has a frame channel 7a.

[0054] like Figure 6 As shown, the conducting member 21 includes an elastic valve body 211 and a conducting cavity structure 214 .

[0055] like Figure 6 As shown, the conduction cavity structure 214 may include a mounting wall 213 and a vent valve nozzle 212. The mounting wall 213 and the vent valve nozzle 212 may be connected, for example, may be connected as one. The mounting wall 213 may surround a circle (similar to a wall forming a complete circle, the same below) and be located at the outer periphery of the vent valve nozzle 212. The vent valve nozzle 212 may surround a circle and be located on the inner side of the mounting wall 213. Figure 6 The dotted line represents the boundary between the installation wall 213 and the vent valve nozzle 212. It can be understood that the position of the boundary is only a schematic diagram.

[0056] like Figure 6 As shown, the mounting wall 213 can be mounted on the frame 7, and the frame 7 supports the mounting wall 213. The side of the mounting wall 213 away from the mounting frame 7 is connected to the mixing chamber structure 5. The mounting wall 213 encloses a conducting chamber 214a. Figure 6 and Figure 1 As shown, the conduction cavity 214a can be communicated with the air channel 1, and the filtered air can enter the conduction cavity 214a through the air channel 1.

[0057] like Figure 6 As shown, the vent valve nozzle 212 can be, for example, funnel-shaped, and its cross section can be approximately inverted cone-shaped. The vent valve nozzle 212 encloses a vent valve nozzle inner cavity 212a. The small funnel-shaped end (i.e., the end with a smaller diameter) of the vent valve nozzle 212 can be connected to or disconnected from the conduction cavity 214a (described below). The large funnel-shaped end (i.e., the end with a larger diameter) of the vent valve nozzle 212 is connected to the mixing cavity 5a of the mixing cavity structure 5. Under the negative pressure of the mixing cavity 5a, the vent valve nozzle inner cavity 212a is also in a negative pressure state.

[0058] like Figure 6 As shown, the elastic valve body 211 can be installed on the side of the vent valve nozzle 212 away from the mixing chamber structure 5 and connected to the frame 7. The installation wall 213 can surround the outer periphery of the elastic valve body 211, and the installation wall 213 can be spaced from the elastic valve body 211.

[0059] like Figure 6 and Figure 7 As shown, the elastic valve body 211 may be a hollow rotating body, which may include a top 211a, an elastic telescopic portion 211b, and an elastic buckle 211c, wherein the elastic telescopic portion 211b connects the top 211a and the elastic buckle 211c. Figure 6 In the figure, the boundary between the top 211a and the elastic expansion part 211b is indicated by a dotted line, and the boundary between the elastic expansion part 211b and the elastic buckle 211c is indicated by a dotted line. It can be understood that this is just a schematic diagram.

[0060] like Figure 6 and Figure 7 As shown, the top 211a can be approximately a solid cylindrical structure, and the top 211a faces the vent valve nozzle 212. The elastic telescopic portion 211b can surround the edge of the top 211a. The cross section of the elastic telescopic portion 211b (as shown in FIG. Figure 6 The cross section (as shown in FIG. 1 ) may be approximately arc-shaped. The elastic buckle 211c may surround the edge of the elastic telescopic portion 211b, and its cross section (as shown in FIG. 1 ) may be approximately arc-shaped. Figure 6 The cross-section shown in FIG. 2 may be approximately L-shaped. The elastic buckle 211c may form a buckle connection with the frame 7, so that the elastic valve body 211 is installed on the frame 7. The buckle connection is a detachable connection, which is convenient for the maintenance and replacement of the elastic valve body 211.

[0061] like Figure 6 As shown, in this embodiment, the top 211a, the elastic telescopic portion 211b and the elastic buckle 211c of the elastic valve body 211 can enclose an elastic valve body cavity 211d. In other embodiments, the elastic valve body cavity 211d of the elastic valve body 211 can also be filled with a resilient filler, which can be a high-resilient sponge. The high-resilient sponge can elastically shrink to provide a rebound force for the volume change of the elastic valve body 211, and has a high compression load ratio, and is relatively good in heat aging, wet aging and dynamic fatigue, which can extend the service life of the elastic valve body 211.

[0062] like Figure 6 As shown, the elastic valve body cavity 211d is communicated with the frame channel 7a of the frame 7. The frame channel 7a is in turn communicated with the first interface 221 of the adjustment member 22. Therefore, the elastic valve body cavity 211d is communicated with the first interface 221 through the frame channel 7a.

[0063] In this embodiment, the elastic valve body 211 may be made of, for example, a flexible material, so that the elastic valve body cavity 211d of the elastic valve body 211 can elastically expand and contract. Preferably, the flexible material may be a silicone diaphragm.

[0064] In this embodiment, the air flow rate can be controlled by controlling the volume of the elastic valve body 211. The specific principle is:

[0065] When the first interface 221 of the regulating member 22 is connected to the third interface 223, the elastic valve body cavity 211d of the elastic valve body 211 is connected to the third interface 223 through the first interface 221. Figure 6As shown, since the third interface 223 is connected to the mixing chamber structure 5 in a negative pressure state, the interior of the elastic valve body cavity 211d is in a negative pressure state, the elastic valve body cavity 211d will shrink, and the elastic telescopic portion 211b will move in a direction away from the mixing chamber structure 5, so that the top 211a of the elastic valve body 211 is separated from the vent valve nozzle 212. At this time, the conduction cavity 214a is connected to the vent valve nozzle inner cavity 212a, so the conduction cavity 214a is connected to the mixing chamber 5a through the vent valve nozzle inner cavity 212a. Since the vent valve nozzle inner cavity 212a and the mixing chamber 5a are in a negative pressure state, under the action of negative pressure, the filtered air in the conduction cavity 212a will be sucked into the mixing chamber 5a.

[0066] When the first interface 221 of the regulating member 22 is connected to the second interface 222, the elastic valve body cavity 211d of the elastic valve body 211 is connected to the second interface 222 through the first interface 221. Figure 6 As shown, since the second interface 222 is connected to the atmosphere, the interior of the elastic valve body cavity 211d is in an atmospheric pressure state, the elastic valve body cavity 211d will expand, and the elastic expansion portion 211b will move toward the direction close to the mixing chamber structure 5. In extreme cases, the top 211a of the elastic valve body 211 will contact the vent valve nozzle 212. At this time, the conduction cavity 214a is disconnected from the inner cavity 212a of the vent valve nozzle, and thus the conduction cavity 212a is disconnected from the mixing chamber 5a, so that the filtered air in the conduction cavity 212a cannot enter the mixing chamber 5a.

[0067] It can be seen that by controlling the distance between the top 211a of the elastic valve body 211 and the vent valve mouth 212, the flow rate of the filtered air entering the mixing chamber 5a can be controlled. The smaller the volume of the elastic valve body 211 shrinks, the greater the distance between the top 211a and the vent valve mouth 212, and the greater the flow rate of the filtered air entering the mixing chamber 5a. In the extreme case, the volume of the elastic valve body 211 shrinks to the minimum value, so that the filtered air can enter the mixing chamber 5a at the maximum flow rate.

[0068] On the contrary, the larger the volume of the elastic valve body 211 expands, the smaller the distance between the top 211a and the vent valve nozzle 212, and the smaller the flow rate of filtered air entering the mixing chamber 5a. In the extreme case, the elastic valve body 211 expands to completely block the vent valve nozzle inner cavity 212a of the vent valve nozzle 212, resulting in zero flow rate of filtered air entering the mixing chamber 5a.

[0069] As described above, the opening sizes of the second interface 222 and the third interface 223 can be controlled by controlling the position of the piston 224 in the regulating member 22. It is easy to understand that when the opening size of the third interface 223 changes, the air flow rate entering the elastic valve body cavity 211d will change, causing the expansion speed of the elastic valve body cavity 211d to change. Similarly, when the opening size of the second interface 222 changes, the air flow rate entering the elastic valve body cavity 211d will change, causing the contraction speed of the elastic valve body cavity 211d to change.

[0070] Therefore, the solution of this embodiment can control the speed of the gas entering or flowing out of the elastic valve body 211 through the adjustment member 22, so as to continuously, flexibly and accurately control the volume of the elastic valve body 211, thereby continuously, flexibly and accurately controlling the flow rate of filtered air entering the mixing chamber 5a.

[0071] In this embodiment, the elastic valve body 211 can adjust the relative position of the elastic valve body 211 and the vent valve mouth 212 under the control of the adjusting member 22, so as to adjust the flow rate of the air filtered by the vent valve mouth 212. This design can make the compression device 6 in a stable working power, without frequently changing the working power to adjust the flow rate of the air filtered by the air valve mouth 212, thereby reducing the power consumption, noise and heat loss of the compression device 6. In addition, the air flow regulating device 2 of this embodiment is extremely small in size, has low power consumption and low cost.

[0072] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An air flow regulating device for a ventilator, the ventilator comprising a mixing chamber structure and a compression device connected to each other, the compression device being used to make the air pressure in the mixing chamber of the mixing chamber structure a negative pressure; characterized in that: The air flow regulating device comprises a conducting member and a regulating member; The conducting member comprises a vent valve nozzle and an elastic valve body; the vent valve nozzle is used to communicate with the mixing chamber so that the filtered air enters the mixing chamber through the vent valve nozzle under the action of the compression device; the elastic valve body is installed on the side of the vent valve nozzle away from the mixing chamber structure, the elastic valve body is a hollow structure formed by surrounding a flexible material, the elastic valve body is filled with a resilient filling material, and the elastic valve body can expand and contract; the vent valve nozzle is funnel-shaped, the end with a smaller diameter of the vent valve nozzle is close to the elastic valve body, and the end with a larger diameter of the vent valve nozzle is used to communicate with the mixing chamber; The regulating member includes a first interface, a second interface and a third interface; the first interface is connected to the elastic valve body; the second interface is used to communicate with the atmosphere; the third interface is used to communicate with the mixing chamber; the regulating member is used to connect the second interface with the first interface and disconnect the third interface from the first interface, so that the elastic valve body expands and approaches the ventilation valve mouth to reduce the flow rate of the filtered air entering the ventilation valve mouth; the regulating member is also used to connect the third interface with the first interface and disconnect the second interface from the first interface, so that the elastic valve body contracts and moves away from the ventilation valve mouth to increase the flow rate of the filtered air entering the ventilation valve mouth; The regulating member also includes a coil winding, a first piston, a second piston and an electromagnetic assembly; the opposite ends of the first piston are respectively connected to the coil winding and the second piston, and the electromagnetic assembly is used to drive the coil winding to move through electromagnetic force, so that the coil winding drives the first piston and the second piston to move; the first piston is close to the second interface, and the second piston is close to the third interface; the first piston and the second piston can move between a position where the second interface is connected to the first interface and the third interface is disconnected from the first interface, and a position where the third interface is connected to the first interface and the second interface is disconnected from the first interface.

2. The air flow regulating device according to claim 1, characterized in that: The adjusting member comprises an elastic member connected to an end of the second piston away from the first piston, and the elastic member is used to provide elastic force to the second piston.

3. The air flow regulating device according to claim 1, characterized in that: The flexible material is a silicone material or a latex material.

4. The air flow regulating device according to claim 1, characterized in that: The conducting member comprises a mounting wall connected to the vent valve nozzle, the mounting wall surrounds the outer periphery of the vent valve nozzle and forms a conducting cavity, and the mounting wall is used to connect with the mixing cavity structure; The conduction cavity is used for allowing filtered air to enter; when there is a distance between the elastic valve body and the end with a smaller diameter of the ventilation valve nozzle, the conduction cavity is communicated with the end with a smaller diameter of the ventilation valve nozzle.

5. A ventilator, characterized in that: An air flow regulating device comprising any one of claims 1 to 4; The mixing chamber is communicated with the third interface of the air flow regulating device and the ventilation valve nozzle; the compression device is communicated with the mixing chamber.

6. The ventilator according to claim 5, characterized in that: The ventilator comprises a frame, the frame having a frame channel, the frame channel being in communication with the first interface of the air flow regulating device; the conducting member of the air flow regulating device is located between the frame and the mixing chamber structure; The conduction member comprises a mounting wall and a ventilation valve nozzle connected to the mounting wall, wherein the mounting wall surrounds the outer periphery of the ventilation valve nozzle and forms a conduction cavity, the mounting wall is mounted on the frame and connected to the mixing cavity structure; the conduction cavity is used for allowing filtered air to enter; when there is a distance between the elastic valve body and the ventilation valve nozzle, the conduction cavity is communicated with the ventilation valve nozzle; The elastic valve body includes a top, an elastic telescopic part and an elastic buckle, the elastic telescopic part is connected between the top and the elastic buckle, the elastic telescopic part surrounds the edge of the top, the top is close to the ventilation valve mouth, and the elastic buckle forms a detachable buckle connection with the frame; the top, the elastic telescopic part and the elastic buckle surround an elastic valve body cavity, and the elastic valve body cavity is connected to the frame channel.

7. The ventilator according to claim 5 or 6, characterized in that: The ventilator comprises an oxygen flow regulating device, which is communicated with the mixing chamber and is used to regulate the flow of oxygen entering the mixing chamber.

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