CN211383336U

CN211383336U - Expiratory valve and breathing machine with same

Info

Publication number: CN211383336U
Application number: CN201922183864.2U
Authority: CN
Inventors: 陈再宏; 俞永伟; 朱好生; 张伟杰
Original assignee: Ningbo David Medical Device Co Ltd
Current assignee: Ningbo David Medical Device Co Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-09-01
Anticipated expiration: 2029-12-09

Abstract

The utility model provides an expiratory valve and have its breathing machine, it includes: the valve comprises a base, a valve body, a diaphragm, a driving device and a flat spiral spring; the base is connected with the valve body; the diaphragm is arranged between the base and the valve body and forms a sealed chamber with the valve body; the driving device comprises a moving shaft, and is arranged in the base and suitable for driving the diaphragm to do reciprocating motion along the axial direction of the moving shaft; the plane spiral spring is arranged on the base and connected with the moving shaft. The utility model discloses a reciprocating motion can be to drive the diaphragm along the axial of motion axle to form positive, negative pressure wave in the sealed cavity that diaphragm and valve body formed, through the connection of the motion axle among flat spiral spring and the drive arrangement, can prevent effectively that the emergence of the circumstances such as the radial swing of motion axle in the axial motion process, thereby guarantee motion axle axial motion's precision and stability, in order to ensure that reciprocating motion's precision and stability are done to the diaphragm.

Description

Expiratory valve and breathing machine with same

Technical Field

The utility model relates to a medical equipment's technical field particularly, relates to an expiratory valve and have its breathing machine.

Background

The expiratory valve is a core component of the breathing machine, is usually used for blocking or opening an expiratory passage, so that the switching between an inspiratory phase and an expiratory phase is realized, and plays an important role in the performance and quality of the breathing machine and the treatment effect of clinical mechanical ventilation. The electromagnetic expiratory valve utilizes the millisecond-level response speed directly driven by electromagnetism and the micron-level stroke control precision to realize the control of high sensitivity and positive activity, and is widely applied to respirators. However, in the prior art, in the process of driving the moving shaft to reciprocate by using the electromagnetic induction principle in the exhalation valve, the moving shaft is usually prone to swing along the radial direction, and thus the accuracy, stability and the like of the axial movement of the moving shaft are difficult to be ensured.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above-mentioned prior art, and an object of the present invention is to provide an exhalation valve and a respirator that can prevent the motion axis from generating radial oscillation and improve the accuracy and stability of the axial motion of the motion axis.

To this end, an aspect of the present invention provides an exhalation valve, comprising: the valve comprises a base, a valve body, a diaphragm, a driving device and a flat spiral spring; the base is connected with the valve body; the diaphragm is arranged between the base and the valve body and forms a sealed chamber with the valve body; the driving device comprises a moving shaft, and is arranged in the base and suitable for driving the diaphragm to reciprocate along the axial direction of the moving shaft; the flat spiral spring is arranged on the base and is connected with the moving shaft.

The utility model discloses an in the one hand, can drive the diaphragm through drive arrangement and be reciprocating motion along the axial of motion axle, in order to form just in the sealed cavity that diaphragm and valve body formed, negative pressure wave, be connected through the motion axle among plane spiral spring and the drive arrangement, can effectively prevent the emergence of the circumstances such as the radial swing of motion axle in the axial motion process, thereby guarantee motion axle axial motion's precision and stability, in order to ensure that reciprocating motion's precision and stability are done to the diaphragm, further, plane spiral spring's setting, can also be when the axial return motion is done to the motion axle, provide the answer elasticity for the motion axle, so that the diaphragm carries out the switching of direction of motion etc. more.

Additionally, in the exhalation valve provided by the utility model, optionally, the flat spiral spring includes first flat spiral spring and second flat spiral spring, first flat spiral spring set up in the bottom of base, and with the one end of moving axle is connected, second flat spiral spring set up in the inside of base, and with the other end of moving axle is connected. In this case, the two ends of the moving shaft are respectively provided with the flat spiral springs, so that the moving shaft can be further prevented from swinging along the radial direction of the moving shaft, the precision and the stability of the axial movement of the moving shaft are further improved, the precision and the stability of the reciprocating movement of the diaphragm are further ensured, and the control precision and the like of the expiratory valve are improved.

Further, in the exhalation valve provided by the present invention, optionally, the flat spiral spring includes a coil, the coil includes a superposed end and a separated end, the superposed end is connected to the moving shaft, and the separated end is connected to the base. In this case, the overlapping end of the scroll is connected to the moving shaft, and the separating end is connected to the base, so that the flat spiral spring can be stably mounted on the base and can be effectively and stably connected to the moving shaft.

Furthermore, in the exhalation valve provided by the present invention, optionally, the flat spiral spring comprises three identical coils, and the separation ends are equally spaced along the circumference of the base. Under the condition, the separation ends of the scrolls can be uniformly distributed on the base, for example, a stable triangular structure is formed at the bottom or inside of the base, and the three scrolls are arranged into the same structure, so that the stress of the moving shaft along the radial direction of the moving shaft is uniform, and the sum of the stresses is zero, thereby effectively achieving the purpose of preventing the moving shaft from swinging due to the radial stress.

In addition, in the exhalation valve provided by the present invention, optionally, the driving device further includes a permanent magnet and a coil assembly, wherein the permanent magnet is disposed in the base and is arranged around the moving shaft in the axial direction; the coil assembly is arranged between the base and the permanent magnet and can reciprocate along the axial direction of the moving shaft so as to drive the moving shaft to reciprocate along the axial direction of the moving shaft. Therefore, power for driving the moving shaft to move can be generated through the interaction of the permanent magnet and the coil assembly, and the moving shaft is driven to reciprocate along the axial direction of the moving shaft.

Additionally, in the exhalation valve provided by the present invention, optionally, a magnetic material is provided on the diaphragm, a joint is provided on the moving shaft, the joint being adapted to form a magnetic connection with the magnetic material. Preferably, the magnetic material is a surface magnet, and the joint is a ferrous material. Under the condition, the magnetic attraction effect of the magnetic material and the joint is utilized, so that an enough and reliable contact surface between the diaphragm and the motion shaft can be ensured, the diaphragm is prevented from being stressed unevenly, disturbed and the like, and the integrity and the stability of the motion of the diaphragm are ensured.

Additionally, in the exhalation valve provided by the present invention, optionally, a first resilient flap is provided between the first flat spiral spring and the bottom of the base. Therefore, the possible impact between the first flat spiral spring and the base can be buffered, so as to prevent the first flat spiral spring or the base from being damaged and prolong the service life of the expiratory valve.

Additionally, in the exhalation valve provided by the utility model, optionally, still be provided with the back iron in the base, it is located coil pack with between the permanent magnet, keep away from on the back iron the one end of permanent magnet is provided with second elastic baffle. Therefore, the arrangement of the back iron can provide a supporting function for the second elastic baffle, and the second elastic baffle can buffer possible impact and the like between the coil assembly and the back iron so as to prevent the back iron or the coil assembly from being damaged and prolong the service life of the exhalation valve.

Additionally, in the exhalation valve provided by the utility model, optionally, the gas vent has been seted up on the valve body, the opening of gas vent is vertical downwards. In this case, on one hand, it is ensured that water droplets produced by the exhalation of the patient flow downwards without contaminating the inside of the pipeline and the respirator having the exhalation valve, and on the other hand, because the density of the gas exhaled by the patient is often greater than that of the air, the opening of the exhaust port is made vertically downwards to facilitate the exhaust.

Additionally, in the exhalation valve provided by the utility model, optionally, the air inlet has been seted up on the valve body, the opening downward sloping of air inlet 5 to 15 degrees. Preferably, the opening of the air inlet is inclined downward by 10 degrees. In this case, the downward outflow of the condensation water of the gas can be facilitated without contaminating the inside of the circuit and of the respirator provided with the exhalation valve.

In addition, in the utility model provides an expiratory valve, optionally, still include: the fixed bayonet lock comprises a first clamping part and a second clamping part; the valve comprises a base and is characterized in that a first boss is arranged on the base, a second boss is arranged on the valve body, a first clamping portion is matched with the first boss, and a second clamping portion is matched with the second boss to form the connection between the valve body and the base. Under this condition, through the setting of fixed bayonet lock, can realize being connected between valve body and the base more convenient effectively to set up the connection of the two into detachable connection state, from this, can realize the sealing connection of structures such as diaphragm more convenient effectively and change or maintenance etc..

Further, in the exhalation valve provided by the present invention, optionally, the base has one or more through holes, and the moving shaft passes through one of the through holes. Under this condition, on the one hand through set up the through-hole on the base, can realize the stable installation of motion axle in the base more conveniently, the other party is through setting up a plurality of through-holes on the base, can make the base be hollow out construction to increased heat radiating area, be favorable to giving off the inside heat that produces of base, prevent to influence motion precision and stability etc. of motion axle because of the high temperature.

Furthermore, in the exhalation valve provided by the utility model, optionally, still include: a cable electrically connected to the coil assembly adapted to provide an alternating current to the coil assembly. From this, provide alternating current through the cable to coil pack, can make coil pack produce the magnetic force of equidirectional not to through the interact with the permanent magnet, make coil pack take place the reciprocating motion of positive and negative direction, further take place the reciprocating motion of positive and negative direction with the drive movement axis.

Furthermore, in the exhalation valve provided by the utility model, optionally, still include: and the microprocessor is electrically connected with the coil assembly and is suitable for controlling the magnitude of the current value in the coil assembly. Therefore, the stroke of the reciprocating motion of the diaphragm can be more accurately controlled by accurately controlling the current value in the coil assembly, so that the end-expiratory pressure of the patient can be accurately controlled, for example, a semi-open state is realized, and the transient response of the expiratory valve in the expiration of the patient is improved.

Another aspect of the present invention provides a ventilator, which includes an exhalation valve as described above, and has the beneficial effects that the above exhalation valve has with respect to the prior art, which is not described herein again.

According to the utility model discloses, can provide one kind and prevent that the motion axle from taking place radial swing, promoting motion axle axial motion's precision and stability to promote diaphragm reciprocating motion's precision and the expiratory valve and the breathing machine of stability.

Drawings

The accompanying drawings, which form a part of the present disclosure, are provided to provide a further understanding of the present disclosure, and are merely schematic drawings, and the ratio of the sizes of the components to each other or the shapes of the components and the like may be different from actual ones. In the drawings:

fig. 1 is a schematic overall structural view of an exhalation valve according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of an exhalation valve according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of an exhalation valve according to an embodiment of the present invention;

fig. 4 is a schematic sectional view of a partial structure of an exhalation valve according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a flat spiral spring of an exhalation valve according to an embodiment of the present invention;

fig. 6 is a schematic view from another perspective of an exploded structure of an exhalation valve according to an embodiment of the present invention;

fig. 7 is another partial schematic structural view of an exhalation valve according to an embodiment of the present invention.

Description of reference numerals:

1-base, 11-first boss, 12-through hole, 2-valve body, 21-air inlet, 22-air outlet, 23-second boss, 3-diaphragm, 31-magnetic material, 4-driving device, 41-motion shaft, 411-joint, 42-permanent magnet, 43-coil component, 431-coil, 432-coil support, 5-flat spiral spring, 51-first flat spiral spring, 52-second flat spiral spring, 53-spiral coil, 531-coincidence end, 532-separation end, 6-first elastic baffle, 7-back iron, 8-second elastic baffle, 9-fixed bayonet, 91-first bayonet part, 92-second bayonet part and 10-cable.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other, and in addition, the exemplary embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an undue limitation on the present invention. Furthermore, in the description of the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", and the like are the directions or positional relationships shown on the basis of the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device referred to must have a specific direction, be constructed in a specific direction, and be operated, and thus, should not be construed as limiting the present invention.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 is a schematic overall structure diagram of an exhalation valve according to an embodiment of the present invention, fig. 2 is a schematic exploded structure diagram of an exhalation valve according to an embodiment of the present invention, fig. 3 is a schematic sectional structure diagram of an exhalation valve according to an embodiment of the present invention, and fig. 4 is a schematic sectional view of a partial structure of an exhalation valve according to an embodiment of the present invention.

The present embodiments relate to a ventilator that includes an exhalation valve. Fig. 1 to 4 schematically show a schematic configuration of the exhalation valve according to the present embodiment, and descriptions of other configurations will be omitted in the following description. As shown in fig. 1 to 4, the exhalation valve according to the present embodiment may include a base 1, a valve body 2, a diaphragm 3, a driving device 4, and a flat spiral spring 5, wherein the base 1 may be connected to the valve body 2, the diaphragm 3 may be disposed between the base 1 and the valve body 2 and form a sealed chamber with the valve body 2, the driving device 4 may include a moving shaft 41, the driving device 4 may be disposed in the base 1 and adapted to drive the diaphragm 3 to reciprocate along an axial direction of the moving shaft 41, and the flat spiral spring 5 may be disposed on the base 1 and connected to the moving shaft 41.

In this embodiment, can drive the diaphragm through drive arrangement and do reciprocating motion along the axial of motion axle, in order to form positive, negative pressure wave in the sealed cavity that diaphragm and valve body formed, through the connection of the motion axle among flat spiral spring and the drive arrangement, can effectively prevent the emergence of the condition such as radial swing of motion axle in the axial motion process, thereby guarantee the precision and the stability of motion axle axial motion, in order to ensure that the diaphragm is reciprocating motion's precision and stability, further, the setting of flat spiral spring, can also be when the motion axle is the axial return motion, provide the resilience for the motion axle, in order to be convenient for the diaphragm to carry out the switching of direction of motion etc..

In the present embodiment, the number of the spiral springs 5 is not particularly limited. In some examples, the spiral spring 5 may be at least two, and as shown in fig. 3, the spiral spring 5 may include a first spiral spring 51 and a second spiral spring 52. In other examples, the first flat spiral spring 51 may be disposed at the bottom of the base 1 and connected to one end of the moving shaft 41, and the second flat spiral spring 52 may be disposed inside the base 1, for example, near the top of the base 1 and connected to the other end of the moving shaft 41. In this case, the two ends of the moving shaft are respectively provided with the flat spiral springs, so that the moving shaft can be further prevented from swinging along the radial direction of the moving shaft, the precision and the stability of the axial movement of the moving shaft are further improved, the precision and the stability of the reciprocating movement of the diaphragm are further ensured, and the control precision and the like of the expiratory valve are improved.

Fig. 5 is a schematic structural view of a flat spiral spring of an exhalation valve according to an embodiment of the present invention.

In the present embodiment, the structure of the spiral spring 5 is not particularly limited. In some examples, as shown in fig. 5, flat spiral spring 5 may include a scroll 53, and scroll 53 may include a coincident end 531 and a separate end 532. In other examples, the coincident end 531 may be coupled to the motion axis 41 and the disjoined end 532 may be coupled to the base 1. In this case, the overlapping end of the scroll is connected to the moving shaft, and the separating end is connected to the base, so that the flat spiral spring can be stably mounted on the base and can be effectively and stably connected to the moving shaft.

In addition, in the present embodiment, the flat spiral spring 5 may include three identical coils 53. The same means that the structure, material, and the like of the scroll are the same. In some examples, the separated ends 532 may be equally spaced along the circumference of the base 1. In other examples, the three separated ends 532 may be located on the same circumference of the bottom or inner plane of the base 1 and equally spaced along the circumference. Under the condition, the separation ends of the scrolls can be uniformly distributed on the base, for example, a stable triangular structure is formed at the bottom or inside of the base, and the three scrolls are arranged into the same structure, so that the stress of the moving shaft along the radial direction of the moving shaft is uniform, and the sum of the stresses is zero, thereby effectively achieving the purpose of preventing the moving shaft from swinging due to the radial stress.

In the present embodiment, the size and structural performance of the scroll 53 are not particularly limited. In some examples, the thickness of the wrap 53 may be 0.1 to 0.8mm, such as 0.3mm, 0.5mm, or 0.6mm, etc.; the maximum pitch circle diameter of the wrap 53 may be 50 to 100mm, for example 65mm, 75.1mm or 85mm etc. In other examples, the stiffness of the wrap 53 may be 200 to 300N/m, such as 220N/m, 250N/m, 270N/m, or the like; the axial stroke of the volute 53 may be 10 to 30mm, for example 16mm, 22mm or 28mm etc. Therefore, the planar spiral spring composed of the spiral coils can be further ensured to have sufficient mechanical property and the like, so that the radial stress of the moving shaft connected with the planar spiral spring is more effectively controlled to be more uniform and stable, the moving shaft is further prevented from radially swinging and the like, and the precision and the stability of the axial movement of the moving shaft are improved.

In the present embodiment, as shown in fig. 3, the valve body 2 may be opened with an intake port 21, wherein the opening direction of the intake port 21 is not particularly limited. In some examples, the opening of the air inlet 21 may be inclined downward by 5 to 15 degrees, such as 8 degrees, 11 degrees, 13 degrees, or the like. Here, the downward inclination of 5 to 15 degrees means that the axis of the air inlet 21 may form an angle α with the horizontal line as shown in fig. 3, and the angle α may range from 5 degrees to 15 degrees. In other examples, the opening of the air inlet 21 may be inclined downward by 10 degrees. In this case, the downward outflow of the condensation water of the gas can be facilitated without contaminating the inside of the circuit and of the respirator provided with the exhalation valve.

In the present embodiment, the valve body 2 may be provided with an exhaust port 22, and the opening direction of the exhaust port 22 is not particularly limited. In some examples, the opening of the exhaust port 22 may be vertically downward. Here, the term "vertically downward" means that the axis of the exhaust port 22 forms an angle of 0 with the vertical line, i.e., coincides with the vertical line. In this case, on one hand, it is ensured that water droplets produced by the exhalation of the patient flow downwards without contaminating the inside of the pipeline and the respirator having the exhalation valve, and on the other hand, because the density of the gas exhaled by the patient is often greater than that of the air, the opening of the exhaust port is made vertically downwards to facilitate the exhaust.

In the present embodiment, a first elastic barrier 6 may be provided between the first spiral spring 51 and the bottom of the base 1. Therefore, the possible impact between the first flat spiral spring and the base can be buffered, so as to prevent the first flat spiral spring or the base from being damaged and prolong the service life of the expiratory valve.

In the present embodiment, as shown in fig. 3 and 4, the driving device 4 may further include a permanent magnet 42 and a coil assembly 43. In some examples, the permanent magnet 42 may be provided in the base 1 and arranged circumferentially in the axial direction of the movement shaft 41. In other examples, the coil assembly 43 may be disposed between the base 1 and the permanent magnet 42 and may reciprocate along the axial direction of the moving shaft 41 to drive the moving shaft 41 to reciprocate along the axial direction thereof. Therefore, power for driving the moving shaft to move can be generated through the interaction of the permanent magnet and the coil assembly, and the moving shaft is driven to reciprocate along the axial direction of the moving shaft.

Further, in the present embodiment, the coil assembly 43 may include a coil 431 and a coil support 432, wherein the coil 431 may be disposed around the coil support 432. In some examples, the coil support base 432 may be coupled to the moving shaft 41. Therefore, when the coil assembly reciprocates, the moving shaft can be driven to reciprocate axially more conveniently and effectively.

In the present embodiment, the material and the number of the permanent magnets 42 are not particularly limited. In some examples, permanent magnet 42 may be a neodymium iron boron magnet. In other examples, the permanent magnet 42 may be eight identical permanent magnets and arranged uniformly around the axis of the movement shaft 41. Therefore, the magnetic force provided by the permanent magnet can be ensured to be uniform and reliable enough, so that the stress of the motion shaft or the coil assembly is uniform, and the precision, the stability and the like of the axial motion of the motion shaft or the coil assembly are further improved.

In the present embodiment, a back iron 7 positioned between the coil block 43 and the permanent magnet 42 may be further provided in the base 1. In some examples, back iron 7 may be located between coil support 432 and permanent magnet 42. In other examples, the back iron 7 may be provided with a second resilient flap 8 at an end thereof remote from the permanent magnet 42. Therefore, the arrangement of the back iron can provide a supporting function for the second elastic baffle, and the second elastic baffle can buffer possible impact and the like between the coil assembly and the back iron so as to prevent the back iron or the coil assembly from being damaged and prolong the service life of the exhalation valve.

Additionally, in this embodiment, the exhalation valve may also include a cable 10 that may form an electrical connection with the coil assembly 43. In some examples, the cable 10 is adapted to provide an alternating current to the coil assembly 43. From this, provide alternating current through the cable to coil pack, can make coil pack produce the magnetic force of equidirectional not to through the interact with the permanent magnet, make coil pack take place the reciprocating motion of positive and negative direction, further take place the reciprocating motion of positive and negative direction with the drive movement axis.

In addition, in this embodiment, the exhalation valve may further include a microprocessor (not shown) that may be electrically connected to the coil assembly 43. In some examples, the microprocessor is adapted to control the magnitude of the current values within the coil assembly 43. Therefore, the stroke of the reciprocating motion of the diaphragm can be more accurately controlled by accurately controlling the current value in the coil assembly, so that the end-expiratory pressure of the patient can be accurately controlled, for example, a semi-open state is realized, and the transient response of the expiratory valve in the expiration of the patient is improved.

In the present embodiment, the moving shaft 41 may be provided with a joint 411, wherein the material of the joint 411 is not particularly limited. In some examples, the joint 411 may be a ferrous material. Therefore, the mechanical strength and other properties of the motion shaft can be improved.

Fig. 6 is a schematic view of another perspective of the exploded structure of the exhalation valve according to the embodiment of the present invention.

In the present embodiment, as shown in fig. 6, a magnetic material 31 may be provided on the diaphragm 3. In some examples, the joint 411 may be adapted to form a magnetic connection with the magnetic material 31. In other examples, magnetic material 31 may be a surface magnet. Under the condition, the magnetic attraction effect of the magnetic material and the joint is utilized, so that an enough and reliable contact surface between the diaphragm and the motion shaft can be ensured, the diaphragm is prevented from being stressed unevenly, disturbed and the like, and the integrity and the stability of the motion of the diaphragm are ensured.

In the present embodiment, a diaphragm ring may be provided on the diaphragm 3. In some examples, the membrane ring may be disposed at a middle position of the magnetic material 31, and press-fit the magnetic material 31 on the membrane 3. Thereby, the fixed mounting of the magnetic material on the diaphragm can be formed more conveniently.

In the present embodiment, the connection mode of the valve body 2 and the base 1 is not particularly limited. In some examples, the valve body 2 may be integrally formed with the base 1, or may be attached by welding, screwing, or the like. In other examples, the exhalation valve may further include a fixing latch 9 having a first latch portion 91 and a second latch portion 92, wherein the base 1 may be provided with a first boss 11, the first latch portion 91 may cooperate with the first boss 11, the valve body 2 may be provided with a second boss 23, and the second latch portion 92 may cooperate with the second boss 23 to form a connection between the valve body 2 and the base 1. Under this condition, through the setting of fixed bayonet lock, can realize being connected between valve body and the base more convenient effectively to set up the connection of the two into detachable connection state, from this, can realize the sealing connection of structures such as diaphragm more convenient effectively and change or maintenance etc..

In the present embodiment, the valve body 2 may be provided with a rib. Therefore, workers or maintenance personnel can conveniently disassemble and assemble the fixed clamping pins by bare hands.

In the present embodiment, as shown in fig. 7, the base 1 may have one or more through holes 12. Wherein the number and size of the through holes are not particularly limited. In some examples, the through-hole may include a first through-hole in the middle of the base 1, through which the moving shaft 41 may pass. In other examples, the through hole 131 may include a second through hole disposed at other portions of the base 1, such as a bottom portion, a top portion, or a side wall, wherein the second through hole is suitable for forming a hollow structure of the base 13. Under this condition, on the one hand through set up the through-hole on the base, can realize the stable installation of motion axle in the casing more conveniently, the other party is through setting up a plurality of through-holes on the base, can make the base be hollow out construction to increased heat radiating area, be favorable to giving off the inside heat that produces of base, prevent to influence motion precision and stability etc. of motion axle because of the high temperature.

In this embodiment, when the exhalation valve is used in a ventilator, when a patient inhales, the coil assembly may be connected to a certain current, and the coil assembly generates a magnetic force in a magnetic field to push the connector on the moving shaft to be combined with the diaphragm, so as to seal the diaphragm, so as to compress the sealed chamber formed by the diaphragm and the valve body, and allow gas to enter the lung of the patient; when the patient exhales, the coil assembly generates opposite magnetic force in the magnetic field to drive the joint on the moving shaft to drive the diaphragm to open the sealed cavity by changing the current direction, so that the patient can exhale smoothly. And when the patient exhales, the current value in the coil assembly can be controlled by the microprocessor according to the state of illness of the patient, so that the pressure at the end of the patient expiration is accurately controlled to realize a semi-open state, and the aims of instantaneous response to the patient expiration and the like are fulfilled.

Although the present invention has been disclosed above, the scope of the present invention is not limited thereto. Without departing from the spirit and scope of the present invention, those skilled in the art can make various changes and modifications, which will fall into the protection scope of the present invention.

Claims

1. An exhalation valve, comprising:

the valve comprises a base (1), a valve body (2), a diaphragm (3), a driving device (4) and a flat spiral spring (5);

the base (1) is connected with the valve body (2);

the diaphragm (3) is arranged between the base (1) and the valve body (2) and forms a sealed chamber with the valve body (2);

the driving device (4) comprises a moving shaft (41), and the driving device (4) is arranged in the base (1) and is suitable for driving the diaphragm (3) to do reciprocating motion along the axial direction of the moving shaft (41);

the plane scroll spring (5) is arranged on the base (1) and is connected with the moving shaft (41).

2. The exhalation valve according to claim 1, characterized in that the flat spiral spring (5) comprises a first flat spiral spring (51) and a second flat spiral spring (52),

the first flat spiral spring (51) is arranged at the bottom of the base (1) and is connected with one end of the moving shaft (41),

the second flat spiral spring (52) is arranged inside the base (1) and is connected with the other end of the moving shaft (41).

3. An exhalation valve according to claim 1 or 2, characterized in that the drive device (4) further comprises a permanent magnet (42) and a coil assembly (43),

the permanent magnet (42) is arranged in the base (1) and is arranged around the axial direction of the motion shaft (41);

the coil assembly (43) is arranged between the base (1) and the permanent magnet (42) and can reciprocate along the axial direction of the moving shaft (41) so as to drive the moving shaft (41) to reciprocate along the axial direction of the moving shaft.

4. An exhalation valve according to claim 1 or 2, characterized in that the diaphragm (3) is provided with a magnetic material (31), and in that the moving shaft (41) is provided with a joint (411), said joint (411) being adapted to form a magnetic connection with the magnetic material (31).

5. An exhalation valve according to claim 2, characterized in that a first resilient flap (6) is provided between the first flat spiral spring (51) and the bottom of the base (1).

6. An exhalation valve according to claim 3, characterised in that a back iron (7) is also provided in the base (1) between the coil assembly (43) and the permanent magnet (42), the back iron (7) being provided with a second resilient flap (8) at the end remote from the permanent magnet (42).

7. The exhalation valve according to claim 1 or 2, characterized in that the valve body (2) is provided with an exhaust port (22), and the opening of the exhaust port (22) is directed vertically downwards.

8. An exhalation valve according to claim 1 or 2, characterised in that the valve body (2) is provided with an inlet opening (21), the opening of the inlet opening (21) being inclined downwardly by 5 to 15 degrees.

9. The exhalation valve of claim 1 or 2, further comprising:

a fixing bayonet (9) including a first click portion (91) and a second click portion (92);

a first boss (11) is arranged on the base (1), a second boss (23) is arranged on the valve body (2),

the first clamping portion (91) is matched with the first boss (11), and the second clamping portion (92) is matched with the second boss (23) to form connection of the valve body (2) and the base (1).

10. A ventilator, comprising:

the exhalation valve of any one of claims 1-9.