Exhalation valve and exhalation valve system

Abstract

The present invention discloses an exhalation valve, including a valve assembly and a control assembly, wherein the valve diaphragm of the valve assembly faces the driving side of the control assembly, and the push rod extending from the driving side of the control assembly abuts against the valve diaphragm to control the degree of opening of the valve port by pushing the valve diaphragm, and also includes at least three groups of floating connection devices arranged around the push rod and capable of elastic floating adjustment along the ejection direction of the push rod, and the two ends of the floating connection device are directly or indirectly connected to the valve assembly and the control assembly respectively. It is allowed that the axis of the control assembly and the axis of the valve assembly are not parallel to each other before being combined, and after being installed and combined, the axis parallelism is automatically aligned through the different compression changes of the floating connection device, avoiding instability in the control downward pressure process, so as to effectively solve the problem of poor control of the position relationship of the push rod relative to the valve diaphragm. The present invention also discloses an exhalation valve including the above-mentioned exhalation valve system.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to an exhalation valve system, and to an exhalation valve comprising the above-described exhalation valve system. Background Technology

[0002] During inspiration, the expiratory valve closes, and the ventilation engine pumps air, propelling the respiratory gases through a specific breathing circuit into the patient's lungs. During expiration, the expiratory valve opens, and the patient's lungs contract. Exhaled air pushes the driving air through the expiratory valve and out into the waste gas treatment system. During expiration, the expiratory valve maintains a certain pressure to achieve PEEP (Penetrative Emission Point). When the fresh air inlet flow rate exceeds the tidal volume, the ventilation engine stops operating. At this point, inspiration and expiration are controlled by opening and closing the expiratory valve. Therefore, the responsiveness and controllability of the expiratory valve are crucial to the performance of the anesthesia machine.

[0003] In anesthesia systems, the expiratory valve works in conjunction with the ventilation motor to control the patient's inhalation and exhalation. Additionally, positive end-expiratory pressure (PEEP) is also achieved by controlling the opening pressure of the expiratory valve. Most existing expiratory valves are pilot-operated, using a proportional valve and orifice to adjust the pressure in the pilot chamber, thus changing the downward pressure of the expiratory valve diaphragm. This achieves inhalation and exhalation and different PEEP requirements. This control method is difficult to precisely control PEEP, exhibiting some time lag and operational inertia. Some expiratory valves directly control the downward pressure of the expiratory valve diaphragm using a voice coil motor. This method results in a fast response and precise control. To eliminate the impact of accumulated dimensional errors on control accuracy and range, the voice coil and valve body are usually integrated as a single component. This design makes cleaning and sterilization impossible (the voice coil cannot be cleaned).

[0004] Most existing exhalation valves are one-piece designs, making cleaning and disinfection impossible for users. Furthermore, due to installation accuracy issues, the push rod can easily misalign with the valve diaphragm during operation, resulting in a discrepancy between the intended direction of diaphragm movement and the actual direction of push rod movement. This leads to inconsistent performance during later use.

[0005] In summary, how to effectively solve the problem of poor positional control of the top rod relative to the valve diaphragm in a split-type exhalation valve is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the first objective of the present invention is to provide an exhalation valve system that can effectively solve the problem of poor control of the positional relationship between the push rod and the valve diaphragm in a split-type exhalation valve. The second objective of the present invention is to provide an exhalation valve including the above-described exhalation valve system.

[0007] To achieve the first objective mentioned above, the present invention provides the following technical solution:

[0008] An exhalation valve includes a valve port assembly and a control assembly. The valve port assembly has a valve diaphragm facing the drive side of the control assembly. A push rod extending from the drive side of the control assembly abuts against the valve diaphragm to control the valve port opening degree by pushing the valve diaphragm. The valve port assembly also includes at least three sets of floating connection devices arranged around the push rod and capable of elastically floating and adjusting along the push rod's extension direction. The two ends of the floating connection devices are directly or indirectly connected to the valve port assembly and the control assembly, respectively.

[0009] According to the above technical solution, three sets of floating connecting devices are arranged around the top rod to form a three-point support between the valve assembly and the control assembly, ensuring stability. Furthermore, adjusting the positional relationship between the two ends of any one set of floating connecting devices changes the positional relationship between the valve assembly and the control assembly at that point, thus altering the angular positional relationship between the top rod and the valve assembly, and consequently, the angular positional relationship between the top rod and the valve diaphragm. This allows for a certain degree of non-parallelism between the axis of the control assembly and the axis of the valve assembly before assembly. Once assembled, the axes automatically align through variations in the compression of the floating connecting devices, preventing instability during the pressure control process. In summary, this exhalation valve effectively solves the problem of poor positional control between the top rod and the valve diaphragm in split-type exhalation valves.

[0010] Preferably, the device includes a floating part and a fixed part; the floating connection device includes a floating guide rod, a bushing, and a compression elastic element, the floating guide rod and the bushing being threadedly connected to form a bolt pair structure; the two ends of the compression elastic element abut against the floating part and the fixed part respectively, the floating guide rod passing through the floating part, the compression elastic element and the fixed part in sequence and then locked by the bushing, so as to change the distance between the floating part and the fixed part by rotating and moving on the floating guide rod through the bushing; the control component is fixedly installed on the floating part, and the fixed part is directly or indirectly installed on the valve port assembly.

[0011] Preferably, the fixing part is a U-shaped plate surrounding the control component, and the floating connection device is respectively provided at the U-shaped bottom and the openings at both ends of the U-shaped plate.

[0012] Preferably, the valve port assembly has a window, and the valve diaphragm is disposed in the window; a cover-shaped positioning plate is provided on the driving side of the valve port assembly, the push rod passes through the middle of the cover-shaped positioning plate to protrude on the driving side, and the edge of the cover-shaped positioning plate abuts against the edge of the window and the edge of the valve diaphragm.

[0013] Preferably, the drive side is provided with a damping air hole that extends into the inner cavity of the control component.

[0014] Preferably, the control component is a voice coil motor, which has a built-in annular magnet, and the voice coil is arranged in the annular air gap at the annular magnet.

[0015] Preferably, the valve assembly is detachable from the floating connection and can be disassembled for cleaning.

[0016] Preferably, the valve assembly is provided with an exhaust outlet, an automatic exhaust outlet, and a manual exhaust outlet, and the valve diaphragm is used to adjust the valve opening degree between the exhaust outlet and the automatic exhaust outlet, and the exhaust outlet and the manual exhaust outlet are connected.

[0017] Preferably, the valve diaphragm has a diaphragm core in the middle, the diaphragm core has a spherical groove in the middle, and the top of the push rod has a spherical protrusion that matches the spherical groove.

[0018] To achieve the second objective mentioned above, the present invention also provides an exhalation valve system, which includes any of the aforementioned exhalation valves, a breathing circuit, a manual / automatic switching valve, and a ventilation engine for connecting to the driving air. The outlet of the ventilation engine and the inlet of the exhalation valve are both connected to the breathing circuit via the manual / automatic switching valve. Since the aforementioned exhalation valve has the above-mentioned technical effects, the exhalation valve system with this exhalation valve should also have corresponding technical effects. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a disassembly diagram of the exhalation valve provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the exhalation valve provided in an embodiment of the present invention;

[0022] Figure 3 A cross-sectional view of the exhalation valve provided in an embodiment of the present invention;

[0023] Figure 4 A longitudinal section diagram of the exhalation valve provided in an embodiment of the present invention;

[0024] Figure 5This is a schematic diagram of the exhalation valve system provided in an embodiment of the present invention.

[0025] The following labels are shown in the attached diagram:

[0026] 100 exhalation valve, 200 ventilation engine, 300 gas isolation device, 400 manual bladder, 500 manual / automatic switching valve, 600 breathing circuit;

[0027] Non-removable part 10, removable part 20, upper seat 30, lower seat 40, exhaust gas outlet 50;

[0028] Control component 11, top rod 12, floating connection device 13, floating part 14, fixed part 15, cover-shaped positioning pressure plate 16, damping air hole 17, ring magnet 18, voice coil 19;

[0029] Floating guide rod 13-1, bushing 13-2, compression elastic element 13-3;

[0030] Valve port assembly 21, valve diaphragm 22, window 23, exhaust outlet 24, automatic exhaust port 25, manual exhaust port 26, diaphragm core 27, valve port 28;

[0031] Valve port assembly axis A, push rod deflection range B;

[0032] The arrows indicate the direction of fluid flow. Detailed Implementation

[0033] This invention discloses an exhalation valve system to effectively solve the problem of poor positional control of the top rod relative to the valve diaphragm in split-type exhalation valves.

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-5 , Figure 1 This is a disassembly diagram of the exhalation valve provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the exhalation valve provided in an embodiment of the present invention; Figure 3 A cross-sectional view of the exhalation valve provided in an embodiment of the present invention; Figure 4 A longitudinal section diagram of the exhalation valve provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the exhalation valve system provided in an embodiment of the present invention.

[0036] In some embodiments, this embodiment provides an exhalation valve 100 as a medical device. Specifically, the exhalation valve includes a valve port assembly 21 and a control assembly 11.

[0037] The valve diaphragm 22 of the valve port assembly 21 faces the drive side of the control assembly 11, and the push rod 12 extending from the drive side of the control assembly 11 abuts against the valve diaphragm 22, so that the opening degree of the valve port 28 of the valve port assembly 21 can be controlled by pushing the valve diaphragm 22.

[0038] The valve diaphragm 22 changes its relative position to the valve port 28 by deforming or moving as a whole, thereby changing the opening degree of the valve port 28. The movement (or partial deformation) of the valve diaphragm 22 relative to the valve port 28 can be along the direction of the valve port 28 to change the distance between them, thus changing the opening degree of the valve port 28; or it can be moved laterally to change the area covered by the valve port 28, thus changing the opening degree of the valve port 28. The valve port 28 is located between two connection ports, one typically connecting to the exhaust outlet 24 of the exhaust system, and the other to an exhaust port connecting to a person, which is generally an automatic exhaust port 25.

[0039] The control component 11 mainly includes a push rod 12 and a drive part that drives the push rod 12 to move along the extension direction to generate thrust. The drive part can be an electric cylinder, a hydraulic telescopic cylinder, or other drive structures. As shown in the attached figure, the control component 11 is a voice coil motor. Specifically, the structure of the control component 11 is not limited here. The drive part that drives the push rod 12 to extend along the extension direction can be configured accordingly, but it must at least satisfy the requirement that the drive part can move along the extension direction via the push rod 12 to push the valve diaphragm 22 to partially deform or move as a whole, thereby changing the opening degree of the corresponding valve port 28.

[0040] In some embodiments, the positional relationship between the valve assembly 21 and the control assembly 11 can be constrained by a floating connection device 13. The floating connection device 13 refers to a support device capable of elastically floating and adjusting in a predetermined direction to change the positional relationship between the two connected ends. The floating connection device 13 mainly includes an elastic part and a locking part. The elastic part supports the two connected objects at both ends, while the locking part can change the degree of deformation of the elastic part, generally by pushing against the connected objects, to adjust the positional relationship between the two connected objects. The floating connection device 13 may have a certain pre-compression amount to ensure that the exhalation valve 100 does not experience changes in the compression amount of the floating connection device 13 throughout its entire operating range, thus affecting control accuracy.

[0041] At least three sets of floating connecting devices 13 are arranged around the top rod 12, and each set can be elastically floated and adjusted along the pushing direction of the top rod 12. The two ends of each floating connecting device 13 are directly or indirectly connected to the valve port assembly 21 and the control assembly 11, respectively, to provide support between the valve port assembly 21 and the control assembly 11 and to constrain their positional relationship. It should be noted that the number of floating connecting devices 13 can be three, four, five, or even more sets, with at least three sets, or even all sets, arranged around the top rod 12; when only three sets of floating connecting devices 13 are provided, the at least three sets refer to all three sets.

[0042] The floating connection device 13 has two ends that 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. "Directly or indirectly connected" means that the two can be directly connected, or they can be indirectly connected through other structures. For example, one end of the floating connection device 13 can be directly connected to the control assembly 11, and the other end can be directly connected to the base (upper base 30, lower base 40), while the valve port assembly 21 is fixedly installed on the base, so that the other end of the floating connection device 13 is indirectly connected to the valve port assembly 21 through the base.

[0043] In some embodiments, three sets of floating connecting devices 13 are arranged around the push rod 12 to form a three-point support between the valve port assembly 21 and the control assembly 11, providing stability. Furthermore, adjusting the positional relationship between the two ends of any one set of floating connecting devices 13 can change the positional relationship between the valve port assembly 21 and the control assembly 11 at this point, thus changing the angular positional relationship of the push rod 12 relative to the valve port assembly 21, i.e., changing the angular positional relationship of the push rod 12 relative to the valve diaphragm 22. This allows for a certain degree of non-parallelism between the axis of the control assembly 11 and the axis of the valve port assembly 21 before engagement. (See attached...) Figure 2 At the location of the valve port assembly axis A, the push rod deflection range B surrounds the valve port assembly axis A. The push rod 12 will offset within the push rod deflection range B. Through the above adjustment, the axis of the push rod 12 can be made to coincide with or nearly coincide with the valve port assembly axis A. Once installed and connected, the axis parallelism is automatically corrected by the different compression changes of the floating connection device 13, avoiding instability during the control of the downward pressure process. In summary, this exhalation valve 100 can effectively solve the problem of poor positional control of the push rod 12 relative to the valve diaphragm 22 in a split-type exhalation valve.

[0044] In some embodiments, the floating connection device 13 may include a floating guide rod 13-1, a bushing 13-2, and a compression elastic element 13-3. The floating guide rod 13-1 and the bushing 13-2 are threadedly connected to form a bolt pair; that is, the floating guide rod 13-1 has a threaded head and a threaded section, and the bushing 13-2 is fitted onto the threaded section and threadedly engaged with it to form the aforementioned locking portion. The compression elastic element 13-3 may be a compression spring or a compression elastomer, serving as the aforementioned elastic portion. Alternatively, the bushing 13-2 may be replaced with a pin, and the floating guide rod 13-1 may have a plurality of pin holes evenly distributed along the ejection direction of the push rod 12, replacing the threaded connection. The compression elastic element 13-3 may be replaced with a tension elastic element.

[0045] In some embodiments, for ease of installation, a floating part 14 and a fixed part 15 may be provided, wherein the floating part 14 may be a floating rod, a floating plate, a floating block or other structural component, and the fixed part 15 may be a fixed block, a fixed rod, a fixed plate or other structural component.

[0046] The compression elastic element 13-3 abuts against the floating part 14 and the fixed part 15 at both ends, respectively. The floating guide rod 13-1 passes through the floating part 14, the compression elastic element 13-3 and the fixed part 15 in sequence and is locked by the bushing 13-2. The bushing 13-2 rotates on the floating guide rod 13-1 to change the distance between the floating part 14 and the fixed part 15. The bushing 13-2 can abut against the side of the fixed part 15 away from the floating part 14, or it can be rotatably connected to the fixed part 15 and fixed relative to it in the ejection direction (axial direction of the floating guide rod 13-1) by a groove. When the bushing 13-2 rotates and moves axially on the floating guide rod 13-1, the bushing 13-2 pushes the fixed part 15 to move axially relative to the floating part 14 under the constraint of the screw head of the floating guide rod 13-1 on the floating part 14. At this time, the compression elastic member 13-3 is further compressed, so that the compression elastic member 13-3 constrains the distance between the fixed part 15 and the floating part 14. The locking part of the floating guide rod 13-1 and the bushing 13-2 can keep the compression 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. Moreover, the positional relationship between the two can be changed by rotating the bushing 13-2.

[0047] In this configuration, one of the control component 11 and the valve port component 21 is fixedly mounted on the floating part 14, and the other is fixedly mounted on the fixed part 15. Specifically, the control component 11 may be fixedly mounted on the floating part 14, and the fixed part 15 may be directly or indirectly mounted on the valve port component 21.

[0048] Specifically, an upper seat 30 and a lower seat 40 may be provided, and the upper seat 30 and the lower seat 40 are detachably and fixedly connected, wherein the fixing part 15 is fixedly installed on the upper seat 30, and the valve port assembly 21 is fixedly installed on the lower seat 40.

[0049] In some embodiments, to facilitate the installation of the above structure, the fixing part 15 can be a U-shaped plate surrounding the control component 11, wherein the bottom of the U-shape and the openings at both ends of the U-shaped plate are respectively provided with floating connection devices 13 to better achieve floating connection.

[0050] Of course, in some embodiments, the fixing part 15 may also be an annular fixing plate to be sleeved on the control component 11, or it may be other structures.

[0051] In some embodiments, a window 23 is typically provided in the valve port assembly 21, and the valve diaphragm 22 is disposed within the window 23, allowing the valve diaphragm 22 to be exposed through the window 23 for easy contact with the push rod 12. The valve diaphragm 22 may be partially or fully exposed at the window 23, in which case the four peripheral edges of the valve diaphragm 22 are sealed to the opening edge of the window 23, thus creating an inner cavity on the inner surface of the valve diaphragm 22.

[0052] In some embodiments, a cover-shaped positioning plate 16 may be further provided on the drive side of the valve port assembly 21, wherein the push rod 12 passes through the middle of the cover-shaped positioning plate 16 to protrude on the drive side, and the edge of the cover-shaped positioning plate 16 abuts against the edge of the valve diaphragm 22, 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-shaped positioning plate 16.

[0053] In some embodiments, a damping vent 17 extending into the cavity of the control assembly 11 can be provided on the drive side. During use, after the upper and lower parts are joined, the cover-shaped positioning plate 16 contacts the valve diaphragm 22, forming a gas chamber with a certain degree of sealing. The top of the cover-shaped positioning plate 16 has a damping vent 17 of a specific size. When the exhalation valve 100 actuates, the volume of the gas chamber changes, and airflow enters and exits through the damping vent 17. When the valve core has a tendency to resonate, the amplitude of the gas chamber change increases, generating greater damping and consuming the kinetic energy of the valve core vibration. The entire process is completed in a very short time, thereby suppressing resonance and noise. Simultaneously, the damping vent 17 extends directly into the control assembly 11 (voice coil motor). When the valve diaphragm 22 fluctuates, the vent disturbs the airflow inside the control assembly 11, which is beneficial for heat dissipation. Especially for the voice coil motor, overheating will cause the internal resistance of the control assembly 11 to increase, the current to decrease, and the thrust to decrease. Furthermore, excessively high temperatures will cause the magnetism of the magnet to decrease.

[0054] In some embodiments, the control component 11 may be a voice coil motor, specifically, wherein the voice coil motor has a built-in annular magnet 18, and the voice coil 19 is arranged in the annular air gap at the annular magnet 18.

[0055] In some embodiments, the valve assembly 21 can be detached from the floating connection device 13 and disassembled for cleaning. As described above, with an upper seat 30 and a lower seat 40, the upper seat 30 and lower seat 40 are detachable. The control assembly 11 and the floating connection device 13 can be non-removable parts 2010, packaged as a single unit, eliminating the need for cleaning.

[0056] The valve port assembly 21 is a detachable part 20, allowing for disassembly and cleaning. Specifically, the valve port assembly 21 can be a valve port manifold assembly. During application, the manifold, valve diaphragm 22, and other structures can be disassembled for easy cleaning.

[0057] In some embodiments, the valve assembly 21 may be provided with an exhaust outlet 24, an automatic exhaust outlet 25, and a manual exhaust outlet 26. The exhaust outlet 24 is used to connect to the exhaust outlet connector 50. The valve diaphragm 22 controls automatic exhaust by adjusting the opening degree of the valve port 28 between the exhaust outlet 24 and the automatic exhaust outlet 25. The exhaust outlet 24 and the manual exhaust outlet 26 are connected to each other, so that manual and automatic exhaust converge at the exhalation valve 100, and the combined channels are discharged to the exhaust system through the same outlet. This facilitates connection and exhaust control.

[0058] In some embodiments, a diaphragm core 27 may be provided in the middle of the valve diaphragm 22, and the valve diaphragm 22 may be fixed on the diaphragm core 27. The hardness of the valve diaphragm 22 is lower than that of the diaphragm core 27. The width of the diaphragm core 27 may be adapted to the valve port 28, and may be able to push the valve diaphragm 22 like a pressure plate. In order to facilitate the push rod 12 to apply force to the valve diaphragm 22, it is preferable that the middle of the diaphragm core 27 has a spherical groove, and the top of the push rod 12 has a spherical protrusion that mates with the spherical groove.

[0059] 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 this exhalation valve 100 system uses the exhalation valve 100 in the above embodiments, the beneficial effects of this exhalation valve 100 system can be found in the above embodiments.

[0060] In some embodiments, the exhalation valve 100 system may further include a breathing circuit 600, a manual / automatic switching valve 500, and a ventilation engine 200 for connecting to the driving air. The outlet of the ventilation engine 200 and the inlet of the exhalation valve 100 may both be connected to the breathing circuit 600 via the manual / automatic switching valve 500. When the manual / automatic switching valve 500 is switched to automatic mode, both the outlet of the ventilation engine 200 and the inlet of the exhalation valve 100 are connected to the breathing circuit 600. When the manual / automatic switching valve 500 is switched to manual mode, the inlet of the manual bladder 400 is connected to the breathing circuit 600, and the outlet of the manual bladder 400 is connected to the outlet of the exhalation valve 100, both leading to the exhaust port. With this configuration, the exhalation valve 100 is positioned downstream of the ventilation engine 200 and upstream of the manual / automatic switching valve 500, on the branch line to the exhaust outlet, and manual exhaust converges downstream of the exhalation valve.

[0061] In some embodiments, a gas isolation device 300 may be further provided, wherein one end of the gas isolation device 300 is interconnected 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 end is connected to the corresponding port of the manual / automatic switching valve 500.

[0062] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0063] The above description of the disclosed embodiments enables those 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 invention is not to 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

1. An exhalation valve, comprising a valve port assembly and a control assembly, wherein the valve diaphragm of the valve port assembly faces the driving side of the control assembly, and a push rod extending from the driving side of the control assembly abuts against the valve diaphragm to control the opening degree of the valve port by pushing the valve diaphragm, characterized in that: It also includes at least three groups of floating connection devices which are arranged around the ejector rod and can be elastically adjusted in the ejection direction of the ejector rod, and the two ends of the floating connection devices are directly or indirectly connected to the valve port assembly and the control assembly respectively; It comprises a floating part and a fixed part; the floating connection device comprises a floating guide rod, a bushing and a compression elastic member, the floating guide rod and the bushing are threadedly connected to form a bolt substructure; the two ends of the compression elastic member are respectively against the floating part and the fixed part, the floating guide rod is sequentially passed through the floating part, the compression elastic member and the fixed part and then locked by the bushing, so as to rotate and move on the floating guide rod through the bushing 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 port assembly; The fixing portion is a U-shaped plate surrounding the control assembly, and the floating connection devices are respectively provided at the U-shaped bottom and the openings at both ends of the U-shaped plate.

2. The exhalation valve according to claim 1, characterized in that: The valve port assembly is provided with a window, and the valve diaphragm is arranged in the window; a cover-shaped positioning pressure plate is provided on the driving side of the valve port assembly, and the push rod passes through the middle part of the cover-shaped positioning pressure plate to be exposed on the driving side, and the edge of the cover-shaped positioning pressure plate abuts against the edge of the window and the edge of the valve diaphragm.

3. The exhalation valve according to claim 2, characterized in that: The driving side is provided with a damping air hole which penetrates into the inner cavity of the control component.

4. The exhalation valve according to claim 2, characterized in that: The control component is a voice coil motor having a built-in annular magnet, and the voice coil is arranged in an annular air gap at the annular magnet.

5. The exhalation valve according to claim 1, characterized in that: The valve port assembly is detachable from the floating connection and can be disassembled for cleaning.

6. The exhalation valve according to claim 1, characterized in that: The valve port assembly is provided with an exhaust gas outlet, an automatic exhaust port and a manual exhaust port. The valve diaphragm is used to adjust the opening degree of the valve port between the exhaust gas outlet and the automatic exhaust port. The exhaust gas outlet and the manual exhaust port are arranged in a through manner.

7. The exhalation valve according to claim 6, characterized in that: A diaphragm hard core is arranged in the middle of the valve diaphragm, a spherical groove is arranged in the middle of the diaphragm hard core, and a spherical protrusion matched with the spherical groove is arranged at the top end of the push rod.

8. An exhalation valve system, comprising a breathing circuit, a manual automatic switching valve and a ventilation engine for connecting a driving gas, characterized in that: Comprising the exhalation valve as described in any one of claims 1 to 7, the air outlet of the ventilation engine and the air inlet of the exhalation valve are both connected to the breathing circuit through the manual-automatic switching valve.

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