CN115317755A - Expiratory valve and expiratory valve system - Google Patents

Abstract

The invention discloses an exhalation valve which comprises a valve port assembly and a control assembly, wherein a valve membrane of the valve port assembly faces to the driving side of the control assembly, a push rod extending out of the driving side of the control assembly abuts against the valve membrane to control the opening degree of a valve port by pushing the valve membrane, the exhalation valve further comprises at least three groups of floating connecting devices which are arranged around the push rod and can be elastically adjusted in a floating mode along the push rod ejecting direction, and two ends of each floating connecting device are respectively connected to the valve port assembly and the control assembly directly or indirectly. The control assembly axis and the valve port assembly axis are allowed to be unparallel before combination, and after the control assembly axis and the valve port assembly axis are installed and combined, the axes are automatically aligned and parallel through different compression amount changes of the floating connecting device, so that instability in the process of controlling the downward pressing is avoided, and the problem that the position relation of the ejector rod relative to the valve diaphragm is not well controlled is effectively solved. The invention also discloses an exhalation valve comprising the exhalation valve system.

Description

Exhalation valve and exhalation valve system

technical field

The present invention relates to the field of medical equipment, more specifically, to an exhalation valve system, and also to an exhalation valve comprising the above exhalation valve system.

Background technique

In the state of inhalation, the exhalation valve is closed and the ventilation engine pumps air, and the driving gas presses the breathing gas into the patient's lungs through a specific breathing circuit channel. When exhaling, the exhalation valve opens, and the patient's lungs contract. The exhaled gas pushes the driving gas out through the exhalation valve and enters the exhaust gas treatment system. When exhaling, the exhalation valve can maintain a certain compressed state to achieve exhalation PEEP. When the fresh air injection flow exceeds the tidal volume, the ventilation engine stops working. At this time, inhalation and exhalation will be realized by opening and closing the exhalation valve. Therefore, the response and controllability of the exhalation valve are very important to the performance of the anesthesia machine.

In the anesthesia system, the exhalation valve cooperates with the ventilation engine to control the patient's inhalation and exhalation. In addition, the positive end-expiratory pressure (PEEP) is also achieved by controlling the opening pressure of the exhalation valve. Most of the existing exhalation valves are in the form of pilot air control, and the proportional valve is used to cooperate with the throttle orifice to adjust the pressure of the pilot chamber and change the downward pressure of the exhalation valve diaphragm. In order to achieve inhalation and exhalation actions and different PEEP requirements. This control method is difficult to accurately control PEEP, and there is a certain delay and action inertia. There are also exhalation valves that directly control the downward pressure of the exhalation valve diaphragm through the voice coil motor. In this way, the exhalation valve responds block and the control is precise. In order to eliminate the impact of cumulative size errors on control accuracy and control range, the voice coil and valve body are usually an integral component. Such a design cannot be cleaned and disinfected (the voice coil part cannot be cleaned).

Most of the existing exhalation valves are integrated, and users cannot clean and disinfect them. In addition, during the process of the ejector pin pushing the valve diaphragm, due to installation accuracy and other issues, it is easy for the two to have poor alignment, that is, there is a deviation between the expected propulsion direction of the valve diaphragm and the actual propulsion direction of the ejector rod, which makes In the later use, the use effect is unstable.

To sum up, how to effectively solve the problem of poor control of the positional relationship between the push rod of the split exhalation valve and the valve diaphragm is an urgent problem for those skilled in the art.

Contents of the invention

In view of this, the first object of the present invention is to provide an exhalation valve system, which can effectively solve the problem of poor control of the positional relationship between the push rod of the split exhalation valve and the valve diaphragm. A second object of the present invention is to provide an exhalation valve comprising the above exhalation valve system.

In order to achieve the above-mentioned first object, the present invention provides the following technical solutions:

An exhalation valve, comprising a valve port assembly and a control assembly, the valve diaphragm of the valve port assembly faces the drive side of the control assembly, and the push rod protruding from the drive side of the control assembly abuts against the valve The diaphragm is used to control the opening degree of the valve port by pushing the valve diaphragm, and it also includes at least three sets of floating connection devices arranged around the ejector rod and capable of elastic floating adjustment along the ejection direction of the ejector rod. Both ends of the device are directly or indirectly connected to the valve port assembly and the control assembly.

According to the above technical solution, three sets of floating connection devices are arranged around the ejector rod to form a three-point support between the valve port assembly and the control assembly, and the three-point support is stable. And arbitrarily adjusting the positional relationship between the two ends of one of the floating connecting devices can change the two-point positional relationship between the valve port assembly and the control assembly here, so the angular positional relationship of the ejector rod relative to the valve port assembly can be changed, that is, it can be changed The angular position relationship of the ejector rod relative to the valve diaphragm. In this way, the shaft center of the control assembly and the shaft center of the valve port assembly are allowed to be non-parallel before being combined. Once installed and combined, the axis parallelism can be automatically aligned through the different compression changes of the floating connection device to avoid instability in the process of controlling the pressing down. To sum up, the exhalation valve can effectively solve the problem of poor control of the positional relationship between the push rod of the split exhalation valve and the valve diaphragm.

Preferably, it includes a floating part and a fixed part; the floating connection device includes a floating guide rod, a bushing and a compression elastic member, and the floating guide rod and the bushing are threaded to form a bolt pair structure; the compression elastic member The two ends respectively abut against the floating part and the fixed part, and the floating guide rod passes through the floating part, the compressed elastic part and the fixed part in turn and is locked by the bushing so as to pass through the fixed part. The bush rotates and moves on the floating guide rod to change the distance between the floating part and the fixed part; the control assembly is fixedly installed on the floating part, and the fixed part is directly or indirectly installed on the valve assembly.

Preferably, the fixing part is a U-shaped plate surrounding the control assembly, and the U-shaped bottom and openings at both ends of the U-shaped plate are respectively provided with the floating connection devices.

Preferably, the valve port assembly is provided with a window, and the valve diaphragm is arranged in the window; the driving side of the valve port assembly is provided with a cover-shaped positioning plate, and the ejector rod passes through the cover-shaped positioning plate. The middle part of the pressing plate is exposed on the driving side, and the edge of the cover-shaped positioning pressing plate is against the edge of the window and against the edge of the valve diaphragm.

Preferably, the driving side is provided with a damping air hole penetrating into the inner chamber of the control assembly.

Preferably, the control component is a voice coil motor, the voice coil motor has a built-in ring magnet, and the voice coil is arranged in an annular air gap at the ring magnet.

Preferably, said port assembly is detachable from said floating connection and disassembled for cleaning.

Preferably, the valve port assembly is provided with an exhaust gas discharge port, an automatic exhaust port and a manual exhaust port, and the valve diaphragm is used to adjust the opening of the valve port between the exhaust gas discharge port and the automatic exhaust port. To a certain extent, the exhaust gas outlet and the manual exhaust outlet are arranged through.

Preferably, the middle of the valve diaphragm is provided with a diaphragm hard core, the middle of the diaphragm hard core has a spherical groove, and the top of the push rod has a spherical protrusion matching the spherical groove.

In order to achieve the above-mentioned second purpose, the present invention also provides an exhalation valve system, which includes any of the above-mentioned exhalation valves, and also includes a breathing circuit, a manual and automatic switching valve, and a valve for connecting the driving gas. The ventilation engine, the air outlet of the ventilation engine and the air inlet of the exhalation valve are all connected to the breathing circuit through the manual and automatic switching valve. Since the above-mentioned exhalation valve has the above-mentioned technical effects, the exhalation valve system having the exhalation valve should also have corresponding technical effects.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the dismantling schematic diagram of exhalation valve provided by the embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an exhalation valve provided by an embodiment of the present invention;

Fig. 3 is a cross-sectional structural schematic diagram of an exhalation valve provided by an embodiment of the present invention;

FIG. 4 is a schematic longitudinal sectional structural view of an exhalation valve provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of an exhalation valve system provided by an embodiment of the present invention.

The marks in the attached drawings are as follows:

Exhalation valve 100, ventilation engine 200, gas isolation device 300, manual skin bag 400, manual and automatic switching valve 500, breathing circuit 600;

Non-detachable part 10, detachable part 20, upper base body 30, lower base body 40, exhaust gas discharge joint 50;

Control assembly 11, ejector rod 12, floating connection device 13, floating part 14, fixed part 15, cover-type positioning plate 16, damping air hole 17, ring magnet 18, voice coil 19;

Floating guide rod 13-1, bushing 13-2, compression elastic member 13-3;

Valve port assembly 21, valve diaphragm 22, window 23, exhaust gas outlet 24, automatic exhaust port 25, manual exhaust port 26, diaphragm hard core 27, valve port 28;

Valve port assembly axis A, ejector rod deflection range B;

Arrows indicate the direction of fluid flow.

Detailed ways

The embodiment of the present invention discloses an exhalation valve system to effectively solve the problem of poor control of the positional relationship between the push rod of the split exhalation valve and the valve diaphragm.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1-Fig. 5, Fig. 1 is a schematic disassembly diagram of the exhalation valve provided by the embodiment of the present invention; Fig. 2 is a schematic structural diagram of the exhalation valve provided by the embodiment of the present invention; Fig. 3 is a schematic diagram of the exhalation valve provided by the embodiment of the present invention Schematic diagram of the cross-sectional structure of the exhalation valve; FIG. 4 is a schematic diagram of the longitudinal sectional structure of the exhalation valve provided by the embodiment of the present invention; FIG. 5 is a schematic structural diagram of the exhalation valve system provided by the embodiment of the present invention.

In some embodiments, this embodiment provides an exhalation valve 100 as a medical device. A specific exhalation valve includes a valve port assembly 21 and a control assembly 11 .

The valve diaphragm 22 of the valve port assembly 21 faces the driving side of the control assembly 11, and the push rod 12 protruding from the driving side of the control assembly 11 abuts against the valve diaphragm 22, so that the valve can be controlled by pushing the valve diaphragm 22. The opening degree of the valve port 28 of the port assembly 21.

The valve diaphragm 22 is deformed or moved as a whole to change its relative position with the valve port 28 to change the opening degree of the valve port 28 . The movement (or local deformation) of the valve diaphragm 22 relative to the valve port 28 can move along the direction of the valve port 28 to change the distance between the valve port 28 and the opening degree of the valve port 28; The lateral movement of the valve port 28 changes the area covering the valve port 28 , thereby changing the opening degree of the valve port 28 . Among them, the valve port 28 is arranged between the connection ports at both ends. Generally, one of the connection ports at both ends is the exhaust gas discharge port 24 connected to the exhaust gas system, and the other is the exhaust port connected to the human body. The exhaust port connected to the human body is generally an automatic exhaust port Air port 25.

The control assembly 11 mainly includes a push rod 12 and a driving part that drives the push rod 12 to move along the extension direction to generate thrust, wherein the driving part is such as an electric cylinder, a hydraulic telescopic cylinder, or other driving structures. As shown in the drawings, the control component 11 is a voice coil motor. Specifically, the structure of the control assembly 11 is not limited here, that is, the driving part that drives the ejector rod 12 to be pushed out along the extension direction can be set correspondingly according to needs, but at least the driving part can be moved along the extension direction by driving the ejector rod 12, To push the valve diaphragm 22 to partially deform or move as a whole, so as to change the degree of opening of the corresponding valve port 28 .

In some embodiments, the positional relationship between the valve port assembly 21 and the control assembly 11 can be constrained by the floating connection device 13 . The floating connection device 13 refers to a supporting device capable of elastic floating adjustment in a predetermined direction, so as to adjust and change the positional relationship of the connecting ends at both ends. The floating connection device 13 mainly includes an elastic part and a locking part, wherein the two ends of the elastic part respectively support the connecting objects at both ends, and the locking part can change the degree of deformation of the elastic part, usually by pushing against the connecting object to adjust the two ends. The positional relationship of the connected objects. The floating connection device 13 may have a certain pre-compression amount, so as to ensure that the exhalation valve 100 does not change the compression amount of the floating connection device 13 within the entire working range, so as to affect the control accuracy.

At least three sets of floating connection devices 13 are arranged around the ejector rod 12, and all of them can be elastically floated and adjusted along the ejection direction of the ejector rod 12, wherein the two ends of the floating connection device 13 are directly or indirectly connected to the valve port assembly 21 and the valve port assembly 21 respectively. The control assembly 11 is supported between the valve port assembly 21 and the control assembly 11 to constrain the positional relationship between them. It should be noted that the number of floating connection devices 13 can be, specifically, three, four, five or even more groups of floating connection devices 13, wherein at least three or even all of the floating connection devices 13 Set around the push rod 12; and when only three sets of floating connecting devices 13 are set, at least three sets are all three sets of them.

The two ends of the floating connection device 13 are directly or indirectly connected to the valve port assembly 21 and the control assembly 11 respectively, specifically: one end of the floating connection device 13 is directly or indirectly connected to the valve port assembly 21 , and the other end is directly or indirectly connected to the control assembly 11 . The direct or indirect connection means that the two can be directly connected, or the two can be indirectly connected through other structures. For example, one end of the floating connection device 13 is directly connected to the control assembly 11, and the other end is directly connected to the seat body (upper seat body 30, lower seat body 40), and the valve port assembly 21 is fixedly installed on the seat body, so that the floating connection device The other end of 13 is indirectly connected to the valve port assembly 21 through the seat body.

In some embodiments, three groups of floating connection devices 13 are arranged around the mandrel 12 to form a three-point support between the valve port assembly 21 and the control assembly 11, and the three-point support is stable. And arbitrarily adjusting the positional relationship between the two ends of one group of floating connection devices 13 can change the two-point positional relationship between the valve port assembly 21 and the control assembly 11 here, so the angular position of the push rod 12 relative to the valve port assembly 21 can be changed. relationship, that is, the angular position relationship of the push rod 12 relative to the valve diaphragm 22 can be changed. In this way, the axes of the control assembly 11 and the valve port assembly 21 are allowed to be non-parallel before they are combined. For example, at the location of the axis A of the valve port assembly in Figure 2, where the deflection range B of the ejector rod surrounds the axis A of the valve port assembly, the ejector rod 12 will be offset within the deflection range B of the ejector rod. Through the above adjustment, the The axis of the push rod 12 coincides with or nearly coincides with the axis A of the valve port assembly. Once installed and combined, the parallelism of the axes can be automatically aligned through the change of the different compression amounts of the floating connection device 13, so as to avoid instability in the process of controlling the pressing down. To sum up, the exhalation valve 100 can effectively solve the problem of poor control of the positional relationship between the plunger 12 and the valve diaphragm 22 of the split exhalation valve.

In some embodiments, the floating connection device 13 may include a floating guide rod 13-1, a bushing 13-2 and a compression elastic member 13-3. Among them, the floating guide rod 13-1 and the bushing 13-2 are threaded to form a bolt pair, that is, the floating guide rod 13-1 has a screw head and a threaded section, and the bushing 13-2 is sleeved on the threaded section and between threaded fit to form the aforementioned locking portion. Wherein the compression elastic member 13-3 can be, for example, a compression spring (compression spring) or a compression elastic body, as the above-mentioned elastic part. Of course, the bushing 13-2 can be replaced by a pin, and the floating guide rod 13-1 is evenly distributed with a plurality of pin holes matched with the pin along the ejection direction of the ejector rod 12, instead of threaded connection. Wherein the compression elastic member 13-3 can be replaced by a stretch elastic member.

In some embodiments, in order to facilitate installation, a floating part 14 and a fixed part 15 can be provided correspondingly, wherein the floating part 14 can be a floating rod, a floating plate, a floating block or other structural members, and wherein the fixed part 15 can be a fixed block, Fixing rods, fixing plates or other structural members.

The two ends of the compressed elastic member 13-3 are against the floating part 14 and the fixed part 15 respectively, and the floating guide rod 13-1 passes through the floating part 14, the compressed elastic part 13-3 and the fixed part 15 successively and passes through the lining. The sleeve 13 - 2 is locked so that the bushing 13 - 2 can rotate and move on the floating guide rod 13 - 1 to change the distance between the floating part 14 and the fixed part 15 . Wherein the bushing 13-2 can abut against the side of the fixed part 15 away from the floating part 14, and can also be rotatably connected to the fixed part 15 and make the two along the ejection direction (the axis of the floating guide rod 13-1) through the slot. direction) is relatively fixed. When the bushing 13-2 rotates to move axially on the floating guide rod 13-1, under the constraint of the screw head of the floating guide rod 13-1 to the floating part 14, the bushing 13-2 pushes the fixed part 15 relative The floating part 14 moves in the axial direction, and at this time the compression elastic part 13-3 is further compressed, that is, the compression elastic part 13-3 constrains the distance between the fixed part 15 and the floating part 14, and the floating guide rod 13-1 The set of locking parts with the bushing 13-2 can keep the compressed elastic member 13-3 in a compressed state, so that the relative positional relationship between the fixed part 15 and the floating part 14 is stable, and the rotation of the bushing 13-2 can , changing the positional relationship between the two.

One of the control assembly 11 and the valve port assembly 21 is fixedly installed on the floating part 14 , and the other is fixedly installed on the fixed part 15 . Specifically, the control assembly 11 may be fixedly installed on the floating part 14 , and the fixed part 15 is directly or indirectly installed on the valve port assembly 21 .

Specifically, an upper base body 30 and a lower base body 40 may be provided, and the upper base body 30 and the lower base body 40 are detachably fixedly connected, wherein the fixed part 15 is fixedly installed on the upper base body 30, and wherein the valve port assembly 21 is fixedly installed On the lower seat body 40.

In some embodiments, in order to facilitate the installation of the above structure, the fixed part 15 can be a U-shaped plate surrounding the control assembly 11, wherein the U-shaped bottom of the U-shaped plate and the openings at both ends are respectively provided with floating connection devices 13 , to better implement floating connections.

Of course, in some embodiments, the fixing part 15 may also be an annular fixing plate to be sleeved on the control assembly 11, or may be other structures.

In some embodiments, generally, a window 23 is opened on the valve port assembly 21 , and the valve diaphragm 22 is disposed in the window 23 to pass through the window 23 so that the valve diaphragm 22 is exposed to facilitate contact with the push rod 12 . Wherein the valve diaphragm 22 can be partially exposed at the window 23 , and can also be completely exposed at the window 23 , and at this time, the peripheral edge of the valve diaphragm 22 is in sealing connection with the mouth edge of the window 23 . So that the inner surface of the valve diaphragm 22 is an inner cavity.

In some embodiments, the driving side of the valve port assembly 21 can be further provided with a cover-type positioning plate 16, wherein the push rod 12 passes through the middle of the cover-type positioning plate 16 to be exposed on the driving side, and the cover-type positioning plate 16 The edge of the valve diaphragm 22 butts against the edge, and may further abut against the edge of the window 23 . At this time, a cavity is formed between the valve diaphragm 22 and the cover-type positioning pressure plate 16 .

In some embodiments, the driving side may be provided with a damping air hole 17 penetrating into the inner cavity of the control assembly 11 . At the time of use, that is, after the upper and lower parts are combined. The cover-shaped positioning platen 16 is in contact with the valve diaphragm 22 to form a gas chamber with a certain degree of airtightness. There is a damping air hole 17 of a specific size on the top of the cover-shaped positioning platen 16 . When the exhalation valve 100 operates, the volume of the air cavity will change, and the damping air hole 17 will have air flow in and out. When the spool tends to resonate, the air chamber changes more widely, resulting in greater damping and consuming the vibration kinetic energy of the spool. The whole process is completed in a very short time, thereby suppressing the occurrence of resonance and noise. At the same time, the damping air hole 17 is directly connected to the inside of the control assembly 11 (voice coil motor). When the valve diaphragm 22 fluctuates, the air hole will disturb the air flow inside the control assembly 11, which is beneficial to the heat dissipation of the control assembly 11. Especially for the voice coil motor, overheating will cause the internal resistance of the control component 11 to increase, the current will drop, and the thrust will decrease. In addition, excessive temperature will cause the magnetism of the magnetic steel to drop.

In some embodiments, the control component 11 may be a voice coil motor, specifically, the voice coil motor has a built-in ring magnet 18 , and the voice coil 19 is arranged in an annular air gap at the ring magnet 18 .

In some embodiments, valve port assembly 21 may be made detachable from floating connection 13 and disassembled for cleaning. When having the upper base body 30 and the lower base body 40 as mentioned above, wherein the upper base body 30 and the lower base body 40 are detachable. Wherein the control assembly 11 and the floating connection device 13 can be used as the non-detachable part 2010 to be packaged as a whole without cleaning.

Wherein the valve port assembly 21 is used as a detachable part 20, so that it can be disassembled and cleaned. Specifically, the valve port assembly 21 may be a valve port manifold assembly. During application, the manifold, valve diaphragm 22 and other structures can be disassembled for easy cleaning.

In some embodiments, the exhaust gas discharge port 24, the automatic exhaust port 25 and the manual exhaust port 26 can be arranged on the valve port assembly 21, wherein the exhaust gas discharge port 24 is used to connect the exhaust gas discharge joint 50, wherein the valve diaphragm 22 is used to control the automatic exhaust by adjusting the opening degree of the valve port 28 between the exhaust gas outlet 24 and the automatic exhaust port 25 . Wherein the exhaust gas discharge port 24 and the manual exhaust port 26 are provided through. In order to make the manual exhaust and the automatic exhaust converge at the exhalation valve 100, the channels are combined and discharged to the exhaust system through the same outlet. For easy connection and easy control of exhaust.

In some embodiments, the middle part of the valve diaphragm 22 can be provided with a diaphragm hard core 27, and the valve diaphragm 22 is fixed on the diaphragm hard core 27, wherein the hardness of the valve diaphragm 22 is lower than that of the diaphragm hard core 27. The hardness of the diaphragm hard core 27 can be adapted to the valve port 28, and can push the valve diaphragm 22 like a pressing plate. In order to facilitate the push rod 12 to apply force to the valve diaphragm 22, it is preferred that the middle part of the diaphragm hard core 27 has a spherical groove, and the top of the push rod 12 has a spherical protrusion matching the spherical groove.

Based on the exhalation valve 100 provided in the above embodiments, the present invention also provides an exhalation valve 100 system, which includes any one of the exhalation valves 100 in the above embodiments. Since the exhalation valve 100 system adopts the exhalation valve 100 in the above-mentioned embodiments, please refer to the above-mentioned embodiments for the beneficial effect of the exhalation valve 100 system.

In some embodiments, the exhalation valve 100 system can also include a breathing circuit 600, a manual and automatic switching valve 500 and a ventilation engine 200 for connecting the driving gas, and the air outlet of the ventilation engine 200, the exhalation valve 100 The air inlets of each are connected to the breathing circuit 600 through the manual and automatic switching valve 500 . Wherein when the manual automatic switching valve 500 is switched to the automatic state, the air outlet of the ventilation engine 200 and the air inlet of the exhalation valve 100 are all connected to the breathing circuit 600; and when the manual automatic switching valve 500 is switched to the manual state, The inlet of the manual skin bag 400 is connected to the breathing circuit 600 , and the outlet of the manual skin bag 400 is connected to the outlet of the exhalation valve 100 so as to be connected to the waste gas outlet. Through the above setting, the exhalation valve 100 is arranged downstream of the ventilation engine 200 and upstream of the manual and automatic switching valve 500, to the branch of exhaust gas discharge, and the manual exhaust is merged downstream of the exhalation valve.

In some embodiments, a gas isolation device 300 may be further provided, wherein one port of the gas isolation device 300 communicates with the air outlet of the ventilation engine 200 and the air inlet of the exhalation valve 100 through a three-way structure, and the other The port at one end is connected to the corresponding port of the manual and automatic switching valve 500 .

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An exhalation valve comprises a valve port assembly and a control assembly, wherein a valve membrane of the valve port assembly faces a driving side of the control assembly, a push rod extending out of the driving side of the control assembly abuts against the valve membrane to control the opening degree of a valve port by pushing the valve membrane, and the exhalation valve is characterized by further comprising at least three groups of floating connecting devices which are arranged around the push rod and can be elastically adjusted in a floating mode along the ejection direction of the push rod, and two ends of each floating connecting device are respectively connected to the valve port assembly and the control assembly directly or indirectly.

2. The exhalation valve of claim 1, comprising a floating portion and a fixed portion; the floating connecting device comprises a floating guide rod, a bushing and a compression elastic piece, and the floating guide rod is in threaded connection with the bushing to form a bolt pair structure; the two ends of the compression elastic part are respectively abutted against the floating part and the fixed part, and the floating guide rod penetrates through the floating part, the compression elastic part and the fixed part in sequence and then is locked by the bushing so as to change the distance between the floating part and the fixed part through the rotation and the movement of the bushing on the floating guide rod; the control component is fixedly arranged on the floating part, and the fixed part is directly or indirectly arranged on the valve port component.

3. The exhalation valve of claim 2, wherein the fixing portion is a U-shaped plate surrounding the control assembly, and the U-shaped bottom and the two end openings of the U-shaped plate are respectively provided with the floating connection device.

4. The exhalation valve of claim 1, wherein the valve port assembly defines a window, the valve diaphragm being disposed within the window; the driving side of the valve port assembly is provided with a cover type positioning pressing plate, the ejector rod penetrates through the middle of the cover type positioning pressing plate to be exposed out of the driving side, and the edge of the cover type positioning pressing plate abuts against the edge of the window and abuts against the edge of the valve diaphragm.

5. The exhalation valve of claim 5, wherein the drive side is provided with a damping air vent that extends through to within the control assembly cavity.

6. The exhalation valve of claim 4, wherein the control assembly is a voice coil motor having a built-in annular magnet, the voice coil being disposed in an annular air gap at the annular magnet.

7. The exhalation valve of claim 1, wherein the valve port assembly is detachable and detachable from the floating connection for cleaning.

8. The exhalation valve of claim 1, wherein the valve port assembly has an exhaust outlet, an automatic outlet and a manual outlet, the valve diaphragm is used to adjust the opening degree of the valve port between the exhaust outlet and the automatic outlet, and the exhaust outlet and the manual outlet are connected through the exhaust outlet.

9. The exhalation valve according to claim 8, wherein the valve diaphragm has a hard diaphragm core in the middle, the hard diaphragm core has a spherical recess in the middle, and the top of the post rod has a spherical protrusion matching with the spherical recess.

10. An exhalation valve system comprising a breathing circuit, a manually automatically switchable valve and a ventilation engine for connection to a drive gas, characterized in that it comprises an exhalation valve as claimed in any one of claims 1 to 9, the outlet of the ventilation engine and the inlet of the exhalation valve being connected to the breathing circuit via the manually automatically switchable valve.

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